Methods and apparatus for selecting between multiple carriers using a single receiver chain tuned to a single carrier
37 claims: 5 independent, 32 dependent
- 1通信方法、該方法は下記を具備する:第1の成分及び第2の成分を含んでいる信号を受信すること、 前記第1の成分は第1の周波数帯域上で主に送信する第1の接続点から受信され、前記第2の成分は、第2の周波数帯域上で主に送信し前記第1の周波数帯域上で時々送信する第2の接続点から受信され ;前記第1の信号成分及び前記第2の信号成分を通すように 第1の フィルタを動作させること、前記第1の信号成分及び前記第2の信号成分は第1の周波数帯域の範囲内 の異なる周波数上で受信され、 前記第2の信号成分は第2の周波数帯域に対応する情報を搬送し;前記第1の信号成分及び前記第2の信号成分を別々に出力するために第2のフィルタを動作させること;第1の信号品質指標を発生させるために、 前記第2のフィルタから出力された 前記第1の信号成分に第1の信号測定を実行すること;第2の信号品質指標を発生させるために、 前記第2のフィルタから出力された 前記第2の信号成分に第2の信号測定を実行すること;及び 前記第1の信号品質指標及び前記第2の信号品質指標の関数とし て前 記第2の信号成分に関係する前記第2の周波数帯域において 動作させる ことと前記第1の周波数帯域において 動作させる こととの間で選択すること。
- 2請求項1の方法、ここにおいて、前記第2の周波数帯域は、前記第1の周波数帯域の範囲外である。
- 3請求項2の方法、ここにおいて、前記受信するステップ、実行するステップ及び選択するステップは、移動体通信デバイスによって実行され、該方法は下記をさらに具備する:前記第1の信号成分を送信するための、該第1の周波数帯域において主に送信する 前記第1の接続点である 第1の送信機を動作させること;及び 前記第1の周波数帯域内の前記第2の信号成分を送信するための、前記第2の周波数帯域において主に送信する 前記第2の接続点である 第2の送信機を動作させること。
- 4請求項3の方法、 ここにおいて、前記第1の送信機及び前記第2の送信機は、同じセルの異なるセクタ内に設置される;ここにおいて、該第1の信号成分は、前記同じセルの第1のセクタに対応する第1のアンテナを使用して送信される;及び ここにおいて、該第2の信号成分は、前記同じセルの第2のセクタに対応する第2のアンテナを使用して送信される。
- 5通信方法、該方法は下記を具備する:第1の成分及び第2の成分を含んでいる信号を受信すること、前記第1の成分は第1の周波数帯域上で主に送信する第1の接続点から受信され、前記第2の成分は、第2の周波数帯域上で主に送信し前記第1の周波数帯域上で時々送信する第2の接続点から受信され;前記第1の信号成分及び前記第2の信号成分を通すように第1のフィルタを動作させること、前記第1の信号成分及び前記第2の信号成分は第1の周波数帯域の範囲内であり、前記第2の信号成分は第2の周波数帯域に対応する情報を搬送し;前記第1の信号成分及び前記第2の信号成分を別々に出力するために第2のフィルタを動作させること;第1の信号品質指標を発生させるために、前記第2のフィルタから出力された前記第1の信号成分に第1の信号測定を実行すること;第2の信号品質指標を発生させるために、前記第2のフィルタから出力された前記第2の信号成分に第2の信号測定を実行すること;及び 前記第1の信号品質指標及び前記第2の信号品質指標の関数として前記第2の信号成分に関係する前記第2の周波数帯域において動作させることと前記第1の周波数帯域において動作させることとの間で選択すること;ここにおいて、前記信号は、時間の1つのピリオドにわたり受信される;及び ここにおいて、前記第1の信号成分及び前記第2の信号成分は、時間の異なる点において受信される。
- 6請求項5の方法、ここにおいて、前記第1の信号成分及び前記第2の信号成分は、前記フィルタの幅と比較して周波数幅が狭い。
- 7請求項6の方法、ここにおいて、前記第1の信号成分及び前記第2の信号成分は、前記フィルタの周波数幅の大きくとも1/20の周波数幅を有する。
- 8請求項3の方法、該方法は下記をさらに具備する:該第2の周波数帯域に信号を定期的に送信するように該第1の送信機を動作させること。
- 9請求項3の方法、ここにおいて、該第1の周波数帯域及び該第2の周波数帯域は、幅が少なくとも1MHzである。
- 10請求項9の方法、ここにおいて、前記フィルタは、幅が2MHzよりも小さな帯域を有する。
- 11請求項3の方法、 ここにおいて、前記第1の送信機及び前記第2の送信機は、異なるセル内に設置される;ここにおいて、該第1の信号成分は、第1のセルに対応する第1のアンテナを使用して送信される;及び ここにおいて、該第2の信号成分は、第2のセルに対応する第2のアンテナを使用して送信される。
- 12請求項1の方法、該方法は下記をさらに具備する:前記第2の周波数帯域が選択される場合、前記第1の帯域の代わりに前記第2の帯域を通すように前記フィルタを制御すること。
- 13請求項12の方法、該方法は下記をさらに具備する:第3の信号成分及び第4の信号成分を通すように該フィルタを動作させること、前記第3の信号成分及び前記第4の信号成分は該第2の周波数帯域の範囲内である;第3の信号品質指標を発生させるために前記第3の信号成分に第3の信号測定を実行すること;第4の信号品質指標を発生させるために前記第4の信号成分に第4の信号測定を実行すること;及び 前記第3の信号品質指標及び前記第4の信号品質指標の関数として該第2の周波数帯域において動作させることと該第1の周波数帯域において動作させることとの間で選択すること。
- 14請求項13の方法、該方法は下記をさらに具備する:前記第1の周波数帯域が選択される場合、前記第2の周波数帯域の代わりに前記第1の周波数帯域を通すように前記フィルタを制御すること。
- 15請求項1の方法、該方法は下記をさらに具備する:前記受信するステップ及び第1及び第2の測定ステップを複数回繰り返すこと、前記第1の周波数帯域と前記第2の周波数帯域との間で前記選択することは前記第2の品質指標が予め決められたインターバルのあいだ前記第1の品質指標を超えた後で該第2の周波数帯域を選択すること。
- 16請求項15の方法、ここにおいて、前記インターバルは、予め決められた期間の時間インターバルである。
- 17請求項15の方法、ここにおいて、前記予め決められたインターバルは、一定数の信号測定を含む。
- 18請求項1の方法、ここにおいて、前記選択することは、予め決められたしきい値に基づく。
- 19請求項18の方法、ここにおいて、前記選択することは、前記第1の信号品質値及び第2の信号品質値が両方とも予め選択されたインターバルのあいだ前記予め決められたしきい値を超える場合、低い方の信号品質値に対応する該周波数帯域を選択することを含む。
- 20請求項18の方法、ここにおいて、前記選択することは、前記第1の信号品質値及び第2の信号品質値のうちの1つが前記予め決められたしきい値より下である場合、高い方の信号品質値に対応する該周波数帯域を選択することを含む。
- 21請求項1の方法、ここにおいて、前記選択することは、前記第1の信号品質値が時間のあいだ減少し、前記第2の信号品質値が時間のあいだ増加し、そして該第1の信号品質値と該第2の信号品質値との差が符号の正負を変える場合、該第2の周波数帯域を選択することを含む。
- 22請求項1の方法、ここにおいて、前記選択するステップは、ユーザに提供されようとしているサービスの品質(QoS)の関数である、前記選択する関数は前記ユーザに提供されようとしている該QoSの変化を示している情報に応じて変化する。
- 23請求項1の方法、ここにおいて、前記選択するステップは、通信システム・ローディングの関数であり、該方法は下記をさらに具備する:通信システム・ローディングを示す情報を受信すること;及び 通信システム・ローディングにおける変化の指示に応じて前記選択する関数を修正すること。
- 24請求項23の方法、ここにおいて、前記通信システム・ローディング情報は、当該基地局から前記信号を受信しているデバイスに該基地局から伝達される。
- 25通信デバイス、該デバイスは下記を具備する:第1の成分及び第2の成分を含んでいる信号を受信するための受信機アンテナ 、前記第1の成分は第1の周波数帯域上で主に送信する第1の接続点から受信され、前記第2の成分は、第2の周波数帯域上で主に送信し前記第1の周波数帯域上で時々送信する第2の接続点から受信され ;前記受信した信号をフィルタするためそして 前記 第1の周波数帯域及び第2の周波数帯域のうちの選択された1つの中の信号を通し他方で前記第1の周波数帯域及び前記第2の周波数帯域の別の1つの中に含まれた少なくとも複数の周波数を破棄するために前記アンテナに接続された制御可能な第 1の フィルタ、前記第1の信号成分及び前記第2の信号成分は該第1の周波数帯域及び該第2の周波数帯域のうちの選択された1つの範囲内 の異なる周波数上で受信され、 該第1の信号成分は前記第1の周波数帯域に関係付けられ、前記第2の信号成分は前記第2の周波数帯域に関係付けられ、前記第2の信号成分は前記第2の周波数帯域に対応する情報を搬送し;前記第1の信号成分及び前記第2の信号成分を別々に出力するために第2のフィルタを動作させること;第1の信号品質指標を発生させるために前記第1の信号成分に第1の信号測定を実行するために前記 第2の フィルタに接続された第1の信号測定デバイス;第2の信号品質指標を発生させるために前記第2の信号成分に第2の信号測定を実行するために前記 第2の フィルタに接続された第2の信号測定デバイス;及び 前記第1の信号品質指標及び前記第2の信号品質指標の関数として 前記 第2の周波数帯域において 動作させる ことと該第1の周波数帯域において 動作させる こととの間で選択するため、そして前記制御可能な 第1の フィルタによって通される該第1の周波数帯域と該第2の周波数帯域のうちの1つを制御するために使用する制御信号を発生させるための周波数帯域選択モジュール。
- 26請求項25のデバイス、ここにおいて、前記第2の周波数帯域は、前記第1の周波数帯域の範囲外である。
- 27請求項25のデバイス、ここにおいて、前記制御可能な 第1の フィルタは、前記第2の周波数帯域が選択された場合に、前記第2の周波数帯域を通しそして前記第1の周波数帯域の少なくとも一部を破棄する。
- 28請求項27のデバイス、ここにおいて、前記制御可能な 第1の フィルタは、前記第2の周波数帯域が選択された場合に、該第2の周波数帯域の範囲内に含まれる第3の信号成分及び第4の信号成分を通す、該デバイスは下記をさらに具備する:第3の信号品質指標を発生させるために前記第3の信号成分に第3の信号測定を実行するための手段;第4の信号品質指標を発生させるために前記第4の信号成分に第4の信号測定を実行するための手段;及び 前記第3の信号品質指標及び前記第4の信号品質指標の関数として該第2の周波数帯域において動作させることと該第1の周波数帯域において動作させることとの間で選択するための手段。
- 29通信システム、該システムは下記を具備する:下記を含む携帯型通信デバイス: i)第1の成分及び第2の成分を含んでいる信号を受信するための受信機アンテナ 、前記第1の成分は第1の周波数帯域上で主に送信する第1の接続点から受信され、前記第2の成分は、第2の周波数帯域上で主に送信し前記第1の周波数帯域上で時々送信する第2の接続点から受信され ;ii)前記受信した信号をフィルタするためそして 前記 第1の周波数帯域及び第2の周波数帯域のうちの選択された1つの中の信号を通し他方で前記第1の周波数帯域及び前記第2の周波数帯域の別の1つの中に含まれた少なくとも複数の周波数を破棄するために前記アンテナに接続された制御可能な 第1の フィルタ、前記第1の信号成分及び前記第2の信号成分は該第1の周波数帯域及び該第2の周波数帯域のうちの選択された1つの範囲内 の異なる周波数上で受信され、 該第1の信号成分は前記第1の周波数帯域に関係付けられ、前記第2の信号成分は前記第2の周波数帯域に関係付けられ 、前記第2の信号成分は前記第2の周波数帯域に対応する情報を搬送し ;iii)前記第1の信号成分及び前記第2の信号成分を別々に出力するための、第2のフィルタ;iv )第1の信号品質指標を発生させるために前記第1の信号成分に第1の信号測定を実行するために前記 第2の フィルタに接続された第1の信号測定デバイス;v )第2の信号品質指標を発生させるために前記第2の信号成分に第2の信号測定を実行するために前記 第2の フィルタに接続された第2の信号測定デバイス;vi )前記第1の信号品質指標及び前記第2の信号品質指標の関数として 前記 第2の周波数帯域において 動作させる ことと該第1の周波数帯域において 動作させる こととの間で選択するため、そして前記制御可能な 第1の フィルタによって通される該第1の周波数帯域と該第2の周波数帯域のうちの1つを制御するために使用する制御信号を発生させるための周波数帯域選択モジュール;及び 第1の基地局、該基地局は通信セル内に配置され、該基地局は下記を含む: 前記第1の信号成分を送信するための、該第1の周波数帯域内に主に送信する 前記第1の接続点である 第1の送信機。
- 30請求項29のシステム、ここにおいて、前記第1の基地局は下記をさらに具備する:該第1の信号成分を送信するために前記セルの第1のセクタの方向に向けられた第1の送信アンテナ;当該第2の送信機が動作する時間の一部の間に前記第1の周波数帯域内に前記第2の信号成分を送信するための、前記第2の周波数帯域内に主に送信する 前記第2の接続点である 第2の送信機、前記第2の送信機は前記第1の送信機がそこに対応するセクタとは異なる前記セルのセクタに対応する;及び 該第2の信号成分を送信するために前記セルの第2のセクタの方向に向けられた第2の送信アンテナ、該第1のセクタ及び該第2のセクタは前記セルの異なる物理的地域に設置される。
- 31通信システム、該システムは下記を具備する:下記を含む携帯型通信デバイス: i)第1の成分及び第2の成分を含んでいる信号を受信するための受信機アンテナ、前記第1の成分は第1の周波数帯域上で主に送信する第1の接続点から受信され、前記第2の成分は、第2の周波数帯域上で主に送信し前記第1の周波数帯域上で時々送信する第2の接続点から受信され;ii)前記受信した信号をフィルタするためそして第1の周波数帯域及び第2の周波数帯域のうちの選択された1つの中の信号を通し他方で前記第1の周波数帯域及び前記第2の周波数帯域の別の1つの中に含まれた少なくとも複数の周波数を破棄するために前記アンテナに接続された制御可能な第1のフィルタ、前記第1の信号成分及び前記第2の信号成分は該第1の周波数帯域及び該第2の周波数帯域のうちの選択された1つの範囲内であり、該第1の信号成分は前記第1の周波数帯域に関係付けられ、前記第2の信号成分は前記第2の周波数帯域に関係付けられ、前記第2の信号成分は前記第2の周波数帯域に対応する情報を搬送し;iii)前記第1の信号成分及び前記第2の信号成分を別々に出力するための、第2のフィルタ;iv)第1の信号品質指標を発生させるために前記第1の信号成分に第1の信号測定を実行するために前記第2のフィルタに接続された第1の信号測定デバイス;v)第2の信号品質指標を発生させるために前記第2の信号成分に第2の信号測定を実行するために前記制御可能なフィルタに接続された第2の信号測定デバイス;vi)前記第1の信号品質指標及び前記第2の信号品質指標の関数として前記第2の周波数帯域において動作させることと該第1の周波数帯域において動作させることとの間で選択するため、そして前記制御可能な第1のフィルタによって通される該第1の周波数帯域と該第2の周波数帯域のうちの1つを制御するために使用する制御信号を発生させるための周波数帯域選択モジュール;及び 第1の基地局、該基地局は通信セル内に配置され、該基地局は下記を含む: 前記第1の信号成分を送信するための、該第1の周波数帯域内に主に送信する前記第1の接続点である第1の送信機;ここにおいて、前記信号は、時間の1つのピリオドにわたり受信される;及び ここにおいて、前記第1の信号成分及び前記第2の信号成分は、時間の異なる点において受信される。
- 32請求項31のシステム、ここにおいて、前記制御可能な 第1の フィルタは、パスバンド・フィルタである、そしてここにおいて、前記第1の信号成分及び前記第2の信号成分は、前記制御可能な 第1の フィルタの幅に比べて周波数幅が狭く、前記第1の信号成分及び前記第2の信号成分は前記制御可能な 第1の フィルタのパスバンド幅の半分よりも狭い幅を有する。
- 33請求項32のシステム、ここにおいて、前記第1の信号成分及び前記第2の信号成分は、前記制御可能な 第1の フィルタのパスバンドの周波数幅の大きくとも1/20の周波数幅を有する。
- 34請求項29のシステム、該システムは下記をさらに具備する:第2のセルに配置された第2の基地局、該第2の基地局は 前記第2の接続点である 第2の送信機を含み、前記第1の送信機及び前記第2の送信機は異なるセル内に配置される;前記第1のセルは該第1の信号成分を送信するための第1のアンテナを含み;及び 該第2のセルは該第2の信号成分を送信するための第2のアンテナを含む。
- 35請求項29のシステム、該システムは下記をさらに具備する:該第2の周波数帯域内に信号を定期的に送信するために該第1の送信機を制御するための手段。
- 36請求項34のシステム、ここにおいて、該第1の周波数帯域及び該第2の周波数帯域は、幅が少なくとも1MHzである。
- 37請求項36のシステム、ここにおいて、前記制御可能な 第1の フィルタは、幅が2MHzよりの狭いパスバンドを有する。
Independent claims37
115 paragraphs, as filed
The present invention relates to communication systems, and more particularly to methods and devices for selecting between multiple carriers in a wireless communication system that uses a single receiver chain tuned to one carrier.
From a practical point of view, using different carriers in different parts of the communication system can be advantageous, for example, because rights to different frequencies are owned in different geographic locations and / or different. This is desirable to minimize signal interference through the carrier user. Spectral diffusion wireless communication systems can use different carriers throughout the system with each carrier associated with a different frequency band. In some wireless communication systems, different cells and / or sectors use different carriers. In some systems, the same sector or the same cell uses different carriers, each with a related frequency band, eg, where the overall bandwidth available in the cell or sector is a different frequency band. , For example, are divided into separate frequency bands.
Wireless terminal (WT: wireless) terminal), for example, a mobile node can travel the entire communication system and with a given sector / cell base station that uses a particular carrier frequency and, for example, the associated band for downlink signaling. Connection can be established. For example, due to changes in loading state on the carrier frequency, eg, for more users, due to changes in the level of interference, or for WT movement, eg, for approaching cell / sector boundaries. As the state changes, it may be advantageous or necessary for the WT to switch to another carrier and connect to another cell / sector / carrier frequency corresponding to the base station transmitter. Generally, in known systems, multiple wireless terminal receiver execution means use a single receiver chain, and wireless terminals are the same carrier, for example, until they are forced to switch due to interruption of communication by a base station. Stay on top. This approach is undesirable because the WT experiences interruptions in communication at the perimeter, and as the WT travels throughout the system, it experiences changes in reception quality, such as fading. Other known receiver execution means use a single receiver chain, where they interrupt communication with the connected base station transmitter, and to search for and evaluate potential alternative carriers. To switch from the carrier that is temporarily in use. This approach is undesirable. The reason is that the WT interrupts the normal communication session during the search interval, consumes time to retune the filter, eg RF filter, to adjust for each search frequency and waits for the detected carrier. Therefore, it consumes time to receive and evaluate any received signal, eg, pilot signal, and then retune to the original carrier setting.
From the point of view of the above discussion, it is clear that there is a need for improved methods and equipment for efficient wireless terminal receiver design and operation. It would be advantageous if such devices and methods could estimate the quality of two alternative channels that use different carrier frequency bands at the same time without interrupting an ongoing communication session. Similarly, it allows continuous tracking of carriers of choice, wireless terminal selection of carrier frequency / cell / sector base station connection points, allowing switching before interruption of communication, switching in the conventional way. It would be advantageous if such a method were provided to allow it to happen and to be able to switch depending on other things, such as system load conditions.
Various embodiments of the present invention include, for example, a wireless communication system that uses a plurality of carriers in a system in which the total available bandwidth is divided into different frequency bands, each band having one related carrier frequency. For example, it is directed to spread spectrum OFDM systems and / or CDMA systems. Different cells in the system can use different carrier frequencies; different sectors of the same cell can use different carrier frequencies. In some embodiments, the same sector in a cell can use different carrier frequencies at different power levels, for example, for additional diversity and additional base station connection options, such as downlink traffic channel signaling. Provide an alternative connection point for.
A wireless terminal receiver suitable for a plurality of carrier frequency selection methods according to the present invention in a multi-cell multi-sector wireless communication system that employs a plurality of carrier frequencies is described. A WT receiver according to the invention can include, for example, a single receiver chain with a single RF module, yet, for example, as a carrier frequency and with a particular base station transmitter, downlink traffic. It is possible to process information on multiple alternative carriers that can be selectively selected as its associated band used by the WT to receive the signaling. Although the receiver of the wireless terminal is tuned to one band at a particular time, the channel quality estimates corresponding to the carriers currently in use and the carriers of choice are not switched between carriers according to the present invention. Occurs in. This approach of the present invention contrasts with known search and evaluation techniques that use a single receiver chain. In a single receiver chain, the WT suspends normal downlink traffic channel signal processing at the currently selected carrier frequency, switches to a possible carrier of choice, monitors the signal, and evaluates it. Perform the measurements used, and then switch back to the original carrier. The approach of the present invention can reduce interruptions between running communication sessions, facilitate continuous WT tracking of alternative carriers, and WT to handoff before loss of communication or degradation to unacceptable levels. Can notify the need, facilitate efficient handoff with timely and minimal interruptions between different base station junctions as wireless terminals move across the system, and / or balance system loading of different carriers. Can be used to help.
In some embodiments, base station transmitters in different cells and / or different sectors, such as different adjacent cells and / or different adjacent sectors, primarily use different carrier frequencies, but in neighboring sectors. Transmit regularly using the carrier frequency of. The mobile node receiver uses a controllable filter, eg, a single chain with a controllable RF filter, in accordance with the present invention to signal within the range of the first selected carrier band, eg, Receives and processes composite signals from multiple different transmitters. The signal contains two components, a first signal component identified in the first currently selected band and a second signal component identified in the second alternative band. Separate quality index values are obtained from the first and second signal components, compared, and a judgment as to whether the receiver's controllable filter should be switched to the second band. Be done.
Wireless terminals provided according to various embodiments of the present invention, such as mobile portable communication devices, are: a receiver antenna, a controllable filter connected to said antenna, a first connected to said controllable filter. Signal measurement device, a second signal measurement device connected to the controllable filter, and a frequency band selection module. The receiver antenna of each WT is used to receive a signal containing a first component and a second component, eg, a composite signal. In certain embodiments, a signal, eg, a composite signal, is received over a period of one time, and a first signal component and a second signal component are received at different time points. A controllable filter, eg, an RF bandpass filter inside a controllable RF module containing a mixer, passes through a selected one of the first and second frequency bands, the other. Removes at least a plurality of frequencies in another one of the first frequency band and the second frequency band. The first signal component and the second signal component are within one selected range of the first frequency band and the second frequency band. The first signal component is associated with the first frequency band, while the second signal component is associated with the second frequency band. In some embodiments, the controllable filter there is a passband filter, where the first and second signal components have a narrower frequency width than the controllable filter width. The first signal component and the second signal component have a width narrower than half the passband width of the controllable filter. In certain embodiments, eg, OFDM embodiments, where, for example, the first signal component and the second signal component are received high power signals, eg, beacon signals that are easy to detect. The first signal component and the second signal component have a frequency width of at most 1/20 of the frequency width of the passband of the controllable filter.
The first signal measuring device performs the first signal measurement on the first signal component to generate the first signal quality indicator, while the second signal measuring device performs the second signal quality indicator. A second signal measurement is performed on the second signal component to generate. In certain embodiments, the first signal measuring device can measure signal energy, SNR, and a WT-specific signal, such as a downlink traffic signal directed to a particular WT, as well as a broadcast signal. For example, the error rate for the assigned signal, the pilot signal, and / or the beacon signal is determined; on the other hand, the second signal measuring device is to be received by the received broadcast signal, for example, a plurality of devices. Performs energy detection and / or SNR detection on multiple allocation signals, pilot signals, and / or beacon signals directed to. The frequency band selection module selects and controls between operating in the second frequency band and operating in the first frequency band as a function of the first signal quality index and the second signal quality index. To control one of a first frequency band and a second frequency band passed by a possible filter, for example, a control signal used for selection is generated.
The base station located inside the communication cell includes a first transmitter for transmitting the first signal component according to various embodiments of the present invention, which is mainly in the first frequency band. Send. The base station can facilitate sectored operation and is connected to a first transmitter and directed towards the first sector of the cell to transmit the first signal component. A first transmitting antenna can be included. Moreover, such sectorized base stations typically include a second transmitter connected to a second antenna. The second transmitter mainly transmits within the second frequency band, but the second transmitter is said to be within the first frequency band according to the present invention during a part of the operating time of the second transmitter. Send the signal component. The second transmitter corresponds to another sector of the cell that is different from the sector to which the first transmitter corresponds. The second transmitter antenna is directed to the second sector of the cell to transmit the second signal component. The first sector and the second sector are located in different physical areas of the cells, eg, adjacent areas that may have some overlap.
According to certain embodiments of the present invention, an additional base station, eg, a second base station, is an adjacent and / or portion of a corresponding second cell, eg, a cell corresponding to a first transmitter. Located in cells that overlap with each other. Such additional base stations can include transmitters and transmitting antennas, are used primarily to transmit signals within their own main frequency band, and the main band of transmitters in adjacent cells. , For example, used to transmit occasionally, for example, periodically within the frequency band used as the main band of the first transmitter. Such a secondary signal may be received by the WT and evaluated as a second signal component of the received signal.
In certain embodiments, the first frequency band and the second frequency band are at least 1 MHz wide. For example, the first and second frequency bands can be the 1.25MHz frequency band as part of a 5MHz whole system that uses three or four different 1.25MHz bands throughout the system. In various systems using a frequency band of at least 1 MHz, the receiver's controllable filter has a passband narrower than 2 MHz.
In various embodiments, the controllable filter can be, for example, an RF filter, a baseband filter or an I / F filter. The filter can be a digital filter, which receives information corresponding to a frequency range larger than the selected frequency band and discards, eg, does not process, information outside the selected frequency band.
In some embodiments, the controllable filter used for bandwidth selection is performed after the FFT. In such cases, FFT results for frequencies outside the selected band can be calculated but not used as a result of filtering. In such embodiments, the physical filters in the RF module may be constant or uncontrollable, and signals from one or more bands are passed by the physical filters. In one such embodiment, after the FFT, tones outside the selected band are discarded, for example, by a digital signal processing module and / or another controllable module. In such an embodiment, the module that discards tones and / or information outside the selected band is a controllable filter and operates in response to a band selection control signal. Various embodiments of the present invention are directed to receiver-operated communication methods used to select between multiple frequency bands. The receiver can be, for example, a receiver inside a portable mobile wireless terminal communication device.
An embodiment of a specific example is to receive a signal containing a first component and a second component, for example, a composite signal, in accordance with the present invention, the first signal component and the second signal component being the first. To operate the passband filter to pass the first signal component and the second signal component, the first signal component to generate the first signal quality index, which is within the frequency band of To perform a first signal measurement on, to perform a second signal measurement on a second signal component to generate a second signal quality indicator, and to perform a first signal quality indicator and a second signal. As a function of the quality index, the selection between operating in the second frequency band related to the second signal component and operating in the first frequency band related to the first signal component is selected. Including. In various embodiments, the first frequency band is outside the range of the second frequency band, for example, the first frequency band and the second frequency band do not overlap separately within the range of a 5 MHz communication system. It can be in the 1.25 MHz frequency band.
According to the method of at least one embodiment of the present invention, the first transmitter, for example, the first base station transmitter, which mainly transmits in the first frequency band, is to transmit the first signal component. It works. The first signal component can be, for example, a downlink traffic signal, an allocation signal, a pilot signal, and / or a beacon signal. The method comprises a second transmitter, eg, another transmitter, which primarily transmits the second signal component within the first frequency band, eg, in the second frequency band for periodic transmission. It comprises operating a base station transmitter. The second signal component can be, for example, a broadcast communication signal, such as, for example, an assigned signal, a pilot signal, and / or a beacon signal.
In certain embodiments, the first and second transmitters are located in different sectors of the same cell. Then, the first signal component is transmitted using the first antenna corresponding to the first sector of the same cell, while the second signal component corresponds to the second sector of the same cell. Is transmitted using a second antenna. In some embodiments, the first transmitter and the second transmitter are installed in different cells, and the first signal component uses a first antenna corresponding to the first cell. On the other hand, the second signal component is transmitted using the second antenna corresponding to the second cell.
In certain embodiments, a signal, eg, a composite signal from two transmitters, is received over one period of time, and a first signal component and a second signal component are received at different points of time. Will be done.
The first signal component and the second signal component have a narrow frequency width as compared with the width of the passband filter in some embodiments. For example, in some embodiments, the first signal component and the second signal component have a frequency width of at most 1/20 of the frequency width of the passband filter.
In certain embodiments, the first and second frequency bands are at least 1 MHz wide, and the passband filter can have a band narrower than 2 MHz.
A receiver that operates to receive, pass through, and measure the first and second signal components, and to select between the first and second frequency bands. For example, in addition to the WT receiver, the method, in certain embodiments, is a passband filter that, when a second frequency band is selected, passes the second band instead of the first band. To further control. Once switched to the second frequency band, the method may further comprise operating a passband filter to pass a third and fourth signal component, said third signal component and said third. The signal component of 4 is within the range of the 2nd frequency band, and the 3rd signal component is subjected to the 3rd signal measurement in order to generate the 3rd signal quality index. Performing a fourth signal measurement on the fourth signal component to generate, and operating in the second frequency band and operating in the first frequency band as a function of the plurality of signal quality indicators. The choice between can be further provided. The passband filter can then be controlled to pass through the first frequency band instead of the second frequency band, provided that the first frequency band is selected.
In certain embodiments, the step of receiving the first signal component and the second signal component, and the step of measuring the first signal component and the second signal component can be repeated multiple times, and Selecting the second frequency band is performed after the second quality index value exceeds the first quality index value during a predetermined interval, for example, a predetermined period or a certain number of signal measurements. Get up. This is done to prevent band switching in response to short periods of time or transient changes in state. Other criteria, such as predetermined thresholds, can be used for selection across multiple frequency bands. For example, the selection corresponds to the lower signal quality value if both the first signal quality value and the second signal quality value exceed a predetermined threshold value during the preselected interval. It is possible to include selecting a frequency band. In that way, the lower quality, eg, the lower power band, can be selected and the higher power band is moved by another one if both signal components indicate satisfactory conditions. Release for use by the body. The choice is to select the frequency corresponding to the higher signal quality value if one of the first signal quality value and the second signal quality value is below a predetermined threshold. It is possible to include selection, thereby selecting the better band when signal quality is an issue. What is selected is that the first signal quality value decreases over time and the second signal quality value increases over time, and the first signal quality value and the second signal quality value The second frequency band when the difference between and changes the sign indicating that the wireless terminal is heading toward the transmitter of the second signal component and away from the transmitter of the first signal component. It is possible to include selecting.
In some embodiments, the step of choice is a quality of service (QoS) function that is being offered to the user, and the function of choice indicates the change in QoS that is being offered to the user. It changes according to the information you have. This change can be given as a change in the threshold used by the selection module to select the frequency band.
In certain embodiments, the step of choice is a function of communication system loading, and the method receives information indicating communication system loading and in response to instructions for change in communication system loading. It further comprises modifying the function to be selected. For example, if the wireless terminal detects frequent use of the first frequency band, the selection can change the weights used in the selection decision, producing stronger directivity for the second frequency band. The received loading information is transmitted from the base station to a device, for example, a WT that receives a signal from the base station.
In various embodiments, the carriers of the plurality of options can be evaluated before the selection decision is made, and the carrier change is initiated before, for example, resetting the controllable filter occurs. To. For example, in a concrete example of a 5 MHz 3-sector / cell system using three 1.25 MHz carrier bands, the first signal component is currently connected, which is used for downlink traffic signaling to the WT. Multiple signals from the base station sector transmitter, such as beacon signals, downlink traffic signals, pilot signals, allocation signals, etc., can be included, while the second signal component is their main carrier. Multiple received signals from adjacent sector / cell transmitters assigned different carrier frequencies as, eg, can be alternated between different beacon signals. After the set of second signals received from the alternative base station sector transmitter connection point has been evaluated and the second quality indicator value has been obtained, the comparison is performed using the first quality indicator value. , And the decision to change the selected band is made.
<figref num="1">FIG. 1 is a diagram of a specific example wireless communication system implemented in accordance with the present invention and supporting multiple carriers using the methods of the present invention.</figref><figref num="2">FIG. 2 is a diagram of a specific example base station implemented in accordance with the present invention and using the methods of the present invention.</figref><figref num="3">FIG. 3 is a diagram of a specific example wireless terminal that is implemented in accordance with the present invention and uses the methods of the present invention.</figref><figref num="4">FIG. 4 is a diagram of a specific embodiment of a receiver capable of processing two components of a signal received from the same selected carrier band at the same time, where each component has different information, eg, two. Communicating information corresponding to one of the different carrier bands, the receiver is performed according to the present invention and using the methods of the present invention.</figref><figref num="5">FIG. 5 is a diagram illustrating base station signaling of a specific example related to a wireless terminal embodiment of a specific example utilizing the embodiment of the specific example of the single receiver chain receiver of FIG. 4 according to the present invention.</figref><figref num="6A">FIG. 6A is a flowchart illustrating a communication method of a specific example for operating a communication system including a wireless terminal of the specific example using the single receiver chain receiver of the specific example of FIG. 4 according to the present invention.</figref><figref num="6B">FIG. 6B is a flowchart illustrating a communication method of a specific example for operating a communication system including a wireless terminal of the specific example using the single receiver chain receiver of the specific example of FIG. 4 according to the present invention.</figref><figref num="7">FIG. 7 is a partial diagram of a wireless communication system of a specific example performed in accordance with the present invention, the system including a working wireless terminal of the specific example, and is used for the purpose of further explaining the present invention. ..</figref><figref num="8">FIG. 8 is a diagram of an embodiment of another embodiment of a receiver performed in accordance with the present invention, the receiver can be used in the wireless terminal shown in FIG.</figref><figref num="9">FIG. 9 is a diagram illustrating a specific example base station sector transmitter signaling including a beacon corresponding to a sector transmitter, the beacon being transmitted in multiple bands according to the present invention: signaling is shown in FIG. It can be transmitted from the base station of the specific example shown.</figref><figref num="10">FIG. 10 is a diagram illustrating a received signal of the specific example in the receiver of the wireless terminal of the specific example shown in FIG. 7.</figref><figref num="11">FIG. 11 is a diagram illustrating a wireless terminal receiver of a specific example of the received signal of the specific example of FIG. 10 and band selection of the specific example according to the present invention.</figref><figref num="12">FIG. 12 is a diagram illustrating a base station sector transmitter signaling of a specific example including a beacon corresponding to the sector transmitter, the beacon being transmitted to a plurality of bands according to the present invention, and a wireless terminal having a new band. After selecting and changing the connection point, signaling can be transmitted from the example base station shown in FIG.</figref><figref num="13">FIG. 13 is an explanatory diagram of a beacon signal of a specific example having a timing offset with respect to adjacent sectors, and is used for the purpose of further explaining the features of the present invention.</figref>
FIG. 1 shows a wireless communication system 100 of a embodiment implemented in accordance with the present invention and supporting multiple carrier and spectral spread signaling. System 100 uses the devices and methods of the present invention. FIG. 1 includes a plurality of specific examples of multi-sector cells, cell 1 102, cell 2 104, and cell 3 106. Each cell (102,104,106) represents a radio communicable area for a base station (BS: base station) and (BS1 108, BS2 110, BS3 112), respectively. In the embodiment of the specific example, each cell 102, 104, 106 includes three sectors (A, B, C). Cell 1 102 includes sector A114, sector B116, and sector C118. Cell 2 104 includes sector A120, sector B122, and sector C124. Cell 3 106 includes sector A126, sector B128, and sector C130. In other embodiments, different numbers of sectors are possible, such as 1 sector per cell, 2 sectors per cell, or more than 3 sectors per cell. Moreover, different cells can contain different numbers of sectors.
A wireless terminal (WT), eg, a mobile node (MN), can move the entire system and communicate with a peer node, eg, another MN, via a wireless link to BS. it can. In sector A114 of cell 1102, WTs (132,134) are connected to BS1 108 via wireless links (133,135), respectively. In sector B116 of cell 1102, WTs (136,138) are connected to BS1 108 via wireless links (137,139), respectively. In sector C118 of cell 1102, WTs (140,142) are connected to BS1 108 via wireless links (141,143), respectively. In sector A120 of cell 2 104, WT (144,146) are connected to BS2 110 via wireless links (145,147), respectively. In sector B122 of cell 2 104, WTs (148,150) are connected to BS2 110 via wireless links (149,151), respectively. Cell 2 In sector C124 of 104, WTs (152,154) are connected to BS2 110 via wireless links (153,155), respectively.
Multiple BSs can be connected together over a network, thus providing connectivity to multiple WTs inside a given cell to multiple peers located outside the given cell. To do. In system 100, BSs (108,110,112) are connected to network node 168 via network links (170,172,174), respectively. A network node 168, eg, a router, connects to the Internet to other network nodes, eg, another base station, router, home agent node, AAA server node, etc., and over network link 176. Will be done. Network links 170,172,174,176 can be, for example, fiber optic links.
BS108,110,112 includes sector-divided transmitters, each sector transmitter being used for conventional signaling, eg, a downlink traffic signal destined for a particular WT, in accordance with the present invention. On the other hand, a specially assigned carrier frequency is used. The assigned carrier frequency of the sector transmitter used for normal signaling is also broadcast from BS to multiple WTs, such as assigned signals, pilot signals, and / or beacon signals. Transport the signal. Moreover, according to the present invention, each base station sector transmitter may, for example, be a pilot signal and / or beacon within the carrier frequency band assigned to the adjacent cell / sector transmitter for their normal signaling. Send an additional downlink signal, such as a signal. Such a downlink signal provides information to a WT, eg, WT132, to evaluate which carrier frequency to choose and which corresponding base station sector / cell to use as a junction. And can be used to determine. The WT, eg, WT132, includes a receiver capable of processing information from BS108,110,112 sector transmitters and provides information over multiple carrier frequency bands of choice. The carrier frequency band can be used for normal communication, eg, downlink traffic channel signaling to the WT, and can be selected by the WT.
FIG. 2 illustrates a specific example of a base station 200, or an access node, given in accordance with the present invention. The BS is called an access node because it acts as a point of WT network connectivity and provides WT access to the network. The base station 200 of FIG. 2 may be a more detailed representation of any of the base stations 108,110,112 of the system 100 of FIG. Base station 200 includes a processor 202 connected together via bus 214, such as a CPU, a receiver 204 including a decoder 206, a sectorized transmitter 208, a memory 210, and an I / O interface 212. Various elements can exchange data and information via the bus. The receiver 204 is connected to the sector-divided antenna 216 and can receive signals from the wireless terminal 300 (see FIG. 3) in each of the sectors covered by the base station 200. The receiver decoder 206 decodes the received uplink signal and extracts the information encoded by the WT300 prior to transmission. The sectorized transmitter 208 includes a plurality of transmitters, a sector 1 transmitter 218, and a sector N transmitter 220. Each sector transmitter (218,220) includes an encoder (222,224) for encoding downlink data / information and is connected to an antenna (226,228), respectively. Each antenna 226,228 corresponds to a different sector and is usually directed to transmit to a sector where the antenna can correspond and be located in that sector. Antennas 226,228 may correspond to different elements of one multi-sector antenna, which may be separate or have different elements for different sectors. Each sector transmitter (218,220) has an allocated carrier frequency band to be used for normal signaling, eg, downlink traffic signaling. Each sector transmitter (218, 220) is capable of transmitting downlink signals within its own assigned carrier frequency band, such as assigned signals, data and control signals, pilot signals, and / or beacon signals. Each sector transmitter (218,220) is similarly down according to the present invention within another carrier frequency band, eg, a carrier frequency band assigned to adjacent cells / sectors for their normal signaling. A link signal, such as a pilot signal and / or a beacon signal, is transmitted. Base station I / O interface 212 connects base station 200 to another network node, such as another access node, router, AAA server, home agent node, and the Internet. Memory 210 includes routine 230 and data / information 232. Processor 202 executes routine 230 and uses the data / information 232 in memory 210 to control the operation of base station 200. The operation of base station 200 includes scheduling users on different carrier frequencies using different power levels, power controls, timing controls, communications, signaling, and beacon signaling according to the present invention. Scheduling of a particular user, eg, a particular WT300, on a particular carrier frequency can be a response to the selections made by the WT300 according to the present invention. 220) Similarly, according to the present invention, additional downlink signals, eg, additional downlink signals within another carrier frequency band, eg, carrier frequency bands assigned to cells / sectors adjacent to their normal signaling, eg. Send a pilot signal and / or a beacon signal. Base station I / O interface 212 connects base station 200 to another network node, such as another access node, router, AAA server, home agent node, and the Internet. Memory 210 includes routine 230 and data / information 232. Processor 202 executes routine 230 and uses the data / information 232 in memory 210 to control the operation of base station 200. The operation of base station 200 includes scheduling users on different carrier frequencies using different power levels, power controls, timing controls, communications, signaling, and beacon signaling according to the present invention. Scheduling of a particular user, eg, a particular WT300, on a particular carrier frequency can be a response to the selections made by the WT300 according to the present invention. 220) Similarly, according to the present invention, additional downlink signals, eg, additional downlink signals within another carrier frequency band, eg, carrier frequency bands assigned to cells / sectors adjacent to their normal signaling, eg. Send a pilot signal and / or a beacon signal. Base station I / O interface 212 connects base station 200 to another network node, such as another access node, router, AAA server, home agent node, and the Internet. Memory 210 includes routine 230 and data / information 232. Processor 202 executes routine 230 and uses the data / information 232 in memory 210 to control the operation of base station 200. The operation of base station 200 includes scheduling users on different carrier frequencies using different power levels, power controls, timing controls, communications, signaling, and beacon signaling according to the present invention. Scheduling of a particular user, eg, a particular WT300, on a particular carrier frequency can be a response to the selections made by the WT300 according to the present invention.
The data / information 232 in the memory 210 is data 234, such as user data being transmitted to the wireless terminal 300 and user data being received from the wireless terminal 300, carrier frequencies and sectors associated with each sector. Includes sector information 236, including data transmission power levels associated with each carrier frequency within, a plurality of carrier frequency information (carrier 1 information 238, carrier N information 240), beacon information 242, and system loading information 243. Carrier frequency information (238,240) includes information that defines carrier frequencies and associated bandwidths. Beacon information 242 includes tone information, such as information related to the beacon signal in each sector having a unique frequency and carrier, and sequence timing related to transmitting the beacon signal. System loading information 243 includes composite loading information for each of the various carrier bands supported by base station 200. System loading information 243 can be transmitted from base station 200 to WT300. In certain embodiments, the WT300 can use the information in the process of determining the selection of bandwidth to be set inside the WT receiver.
The data / information 232 in the memory 210 also includes a plurality of WT data / information 244 sets: WT1 data / information 246, WTN data / information 248, one set for each WT. The WT1 data / information 246 includes the user data transferred from WT1 to /, the terminal ID that associates the WT with the base station 200, the sector ID that identifies the sector in which the WT1 is currently located, and the down. Contains carrier frequency information that associates WT1 with a particular carrier frequency used for link signaling.
Base station routine 230 includes communication routine 250 and base station control routine 252. Communication routine 250 can provide various communication protocols used by base station 200. Base station control routine 252 includes scheduler module 254 and signaling routine 256. Base station control routine 252 controls base station operation, scheduling, signaling, and beacon signaling, including receiver 204, transmitter (218,220), according to the present invention. The scheduler module 254, eg, the scheduler, is used to schedule wireless link resources to the wireless terminal 300 for uplink and downlink communications, eg, bandwidth over time. Base station control routine 252 also includes signaling routine 256. It controls receiver 204, decoder 206, transmitter 218,220, encoder 222,224, normal signal generation, data and control tone hopping, and signal repetition. Beacon Routine 258, also included in Signaling Routine 256, uses Beacon Information 242 to control the generation and transmission of beacon signals in accordance with the present invention. According to the present invention, in certain embodiments, a beacon signal, eg, a high power signal that is relatively narrow in frequency, is each in each of the carrier frequency bands used by that sector / cell or by adjacent sectors / cells. Can be transmitted within a sector. These beacon signals are used by the WT300 in certain embodiments to compare the available carriers of the alternatives and to compare the downlink channels of the alternatives using the carriers of the alternatives.
FIG. 3 illustrates a specific example of a wireless terminal 300, such as a mobile node, which is implemented in accordance with the present invention and uses the methods of the present invention. The wireless terminal 300 of FIG. 3 may be a more detailed description of any of WT132,134,136,138,140,142,144,146,148,150,152,154,156,158,160,162,164,166 of the system of FIG. The wireless terminal 300 includes a receiver 302, a transmitter 304, a processor 306, for example, a CPU and a memory 308 connected together via the bus 310, and various elements can exchange data and information via the bus. ..
The receiver 302 is connected to the antenna 312 and the downlink signal is received from the plurality of base station sector transmitters and the corresponding sector antennas 226,228 through the antenna 312. The receiver 302 includes a single spectrum spread receiver chain 314 and a band selection controller 316. Spectral diffusion receiver chain 314 includes an RF module (frequency synchronization circuit) 320 for performing filtering and other operations. The RF module 320 includes a controllable passband filter 321 for removing frequencies outside the selected band and, on the other hand, passing frequencies within the selected band, eg, carrier signals. The extension module 322 is included in the receiver chain 314 along with the digital signal processing module 324 and the energy detection / SNR detection module 334. The digital signal processing module 324 includes a decoder 326 and a signal quality detector module 328.
RF module 320, receiver chain extension module 322, digital signal processing module 324, and energy detection / SNR detection module 334 are used to receive, decode, measure, and evaluate various signals. The various signals are transmitted by multiple cell / sector base station transmitters using the currently selected first band associated with a particular first carrier frequency, eg, an assigned signal. , Downlink traffic channel data and information signals, pilot signals, and / or beacon signals. The band selection controller 316 outputs a signal to the RF module 320 and the adjustable filter 321 contained therein to select a specific carrier frequency; the RF module 320 is within the selected carrier frequency band. Pass the received signal components of and remove at least multiple signals outside the selected carrier frequency band. The RF module 320 also performs additional processing, eg, multiple signals are hybridized in baseband. The output signal passed by the RF module 320 is processed, eg, filtered by the baseband, converted from an analog signal to a digital signal, and further filtered by the receiver chain extension module 322 by the digital filter. The signal is then output from the extension module 322 and transferred to the digital signal processing module 324 and the energy detection / SNR detection module 334. A plurality of signal components corresponding to the currently selected band, for example, from the first base station cell / sector transmitter, are processed by the digital signal processing module 324; On the other hand, another signal component corresponding to another carrier band, eg, from a second cell / sector transmitter, is processed by the energy detection / SNR detection module 334. The digital signal processing module includes a decoder 326, which can decode the downlink traffic signal directed to a particular WT300; on the other hand, the energy detection / SNR detection module 334 does not include such decoding capability.
The output from the signal quality detector module 328 of the digital signal processing module 324 and from the energy detection / SNR detection module 334, for example, the quality index value is input to the band selection module 316, the band selection module 316 is the present invention. Therefore, the selection of the frequency band setting in the RF module (frequency synchronization circuit) 320 is controlled.
Transmitter 304 includes encoder 336 and is connected to transmitter antenna 338. A block of data / information, eg, uplink data / information, can be encoded by encoder 336 and then transmitted to base station 200 via antenna 338.
Memory 308 contains routine 340 and data / information 342. The processor 306, for example the CPU, executes routine 340 and uses the data / information 342 in memory 308 to operate the WT300 and performs the methods of the invention.
Wireless terminal data / information 342 includes user data 344, user device / session resource information 346, current selected carrier information 348, alternative carrier information 350, cell / sector information 352, carrier frequency information 354, detection. The signal information 356 and the carrier selection information 358 are included.
User data 344 includes data, information and files that are intended to be transmitted to / or received from the peer node in a communication session using the wireless terminal 300. User / device / session resource information 346 includes, for example, terminal ID information, base station ID information, sector ID information, selected carrier frequency information, mode information, and identified beacon information. The terminal ID information can be an identifier assigned to the WT300 by the base station 200 to which the WT300 is connected to the base station, which identifies the wireless terminal 300 to the base station 200. The base station ID information can be, for example, the value of the slope associated with the base station 200 and used in the hopping sequence. The sector ID information includes information that identifies the sector ID of the transmitter / receiver of the base station divided into sectors, and normal signaling is communicated via the transmitter / receiver, and within the sector. It may correspond to the sector of the cell in which the wireless terminal 300 is located. The selected carrier frequency information is information that identifies the carrier, eg, the carrier to which the RF module is tuned to that carrier, downlink data signaling, eg, information used by the BS for traffic channel signals. including. The mode information identifies whether the wireless terminal 300 is in the on / hold / sleep state.
The current selected carrier information 348 contains information that identifies the selected carrier to which the RF module 320 is tuned by the band selection controller 316. The alternative carrier information 350 includes information that identifies the alternative carrier whose information to that carrier is being evaluated by the corresponding energy detection / SNR detection module 334. The cell / sector ID information 352 can include information used in processing data, information, control signals, and beacon signals to construct hopping sequences used in transmission and reception. Carrier frequency information 354 can include information relating to each sector / cell of a base station in a communication system having a particular carrier frequency or multiple carrier frequencies, frequency bands, beacon signals, and a set of tones. .. Carrier frequency information 354 also includes quality indicator related information 355, which associates a particular carrier frequency with each quality indicator value, and this particular carrier frequency may be selected by the band selection controller 316. it can.
The detected signal information 356 includes signal energy information 360, SNR information 362, estimated error information 364, a first quality index value 366, and a second quality index value 368. The detected signal information 356 also includes synchronization information 370 and broadcast communication signal information 372.
The detected signal information 356 includes information output from the signal quality detector 328 of the digital signal processing module 324 and information output from the energy detection / SNR detection module 334 in the receiver 302. The signal quality detector module 328 can measure and record the signal energy 360, SNR362, and / or estimated error rate 364 of the signal component from the first transmitter, and the receiver 302 is currently in that band. Determines the first quality indicator value 366, which is an indicator of the quality of the channel between the first transmitter and the WT300, eg, the downlink traffic channel, when using the configured carrier bandwidth. .. The energy detection / SNR detection module 334 can measure and record the signal energy 360 and / or SNR362 of the signal component from the second transmitter, and possible channels, such as the second band and alternatives. Determine a second quality indicator value 368, which is an indicator of the downlink traffic channel to and from the carrier bandwidth.
The synchronization information 370 includes, in some embodiments, timing synchronization information based on, for example, the pilot signal that is used and / or acquired by the receiver while processing the CDMA pilot signal. be able to. In some OFDM embodiments, the synchronization information can include symbol timing recovery information. The broadcast information 372 may include information related to, for example, broadcast communications that is used and / or acquired by the receiver while processing a signal, eg, a pilot signal or a beacon signal. it can.
The carrier selection information 358 includes predetermined threshold value information 374, preset interval information 376, rate change information 378, and quality of service (QoS). Service) Includes information 380 and system loading information 382. The carrier selection information 358 is used in WT300 when making a band selection determination when evaluating the detected signal information, for example, when comparing the first quality index value 366 with the second quality index value 368. Information used by, for example, criteria, limits, etc. The predetermined threshold information 374 includes the level used for comparison with the quality index values 366,368 to make a bandwidth selection decision. The preselected interval information 376 includes a time interval of a fixed period and a fixed number of signal measurement intervals. Each of them has, for example, a consistent state in which the second quality indicator exceeds the first quality indicator at that interval before the bandwidth selection controller 316 changes the selection for the RF module 320. It can be used to specify a fixed interval. The rate change information 378 shows that the first signal quality indicator value 366 decreases over time, while the second signal quality indicator value 368 increases over time, and the first quality indicator value and the first. Includes criteria used to identify when the difference between the two quality indicators changes the sign. Quality of service (QoS) information 380 includes QoS provided to individual users, bandwidth selection as a function of the level of QoS being provided to one user, and the level of QoS being provided to that user. Contains information related to changes in the selection as a result of changes in. System loading information 382 includes received information related to system loading communicated by base station 200 that can be used to make functional control decisions regarding bandwidth selection.
The WT routine 340 includes a communication routine 384 and a wireless terminal control routine 386. The wireless terminal communication routine 384 provides various communication protocols used by the wireless terminal 300. The wireless terminal control routine 386 performs the functional control operations of the wireless terminal 300, which provides power control, timing control, signaling control, data processing, I / O, receiver control and carrier bandwidth selection functions according to the present invention. Including. The WT control routine 386 includes a signaling routine 388, a receiver control module 390 and a carrier bandwidth selection module 392. The signaling routine 388, which uses the data / information 342 in the memory 308, controls the signaling of the WT300, for example, uplink-communicated signals and downlink-communicated signals. In cooperation with modules 324,334, the receiver controller module 390 decodes, performs energy detection and / or SNR detection on the received signal, and performs a first quality indicator and a second quality in accordance with the present invention. Controls the operation of receiver 302, including the occurrence of index values 366,368. In cooperation with the band selection controller 316, the carrier band selection module 392 was derived from a received signal containing the first quality index value and the second quality index value 366,368, as well as the carrier selection information 358, according to the present invention. The data / information is used to make decisions about the carrier selected to tune the RF module 320 of receiver 302.
FIG. 4 is an example of a specific example of a wireless terminal receiver 501 / antenna 502 combination 500 given according to the present invention. The receiver / antenna combination 500 of FIG. 4 can be used as the receiver 302 / antenna 312 combination in the WT300 of FIG. Receiver 501 illustrates embodiments of a specific example of a receiver according to the present invention, which can simultaneously process two components of a received signal contained in the same selected carrier band, each component being different. It carries information, eg, information corresponding to one of two different carrier bands transmitted by different transmitters and / or transmitted by different transmitting antennas. The two signal components can correspond to different sectors and / or different cells in one cell.
Receiver 501 in FIG. 4 uses a single RF processing chain that includes a single RF processing module (frequency synchronization module) 502. The receiver 501 is connected to an antenna 504 that receives downlink signals from a plurality of sector / cell base station transmitters. The antenna 504 is connected to the RF processing module 502. The RF processing module 502 includes a selectable RF filter 506 and a mixer circuit 508. The RF filter 506 can be given as a passband filter and acts as a frequency synchronization circuit. The RF processing module 502 is tuned to the carrier frequency selected by the band selection controller 510. The RF filter passes the received signal components within the selected carrier band and removes at least multiple signal components outside the selected carrier band.
The passband signal received from the antenna 504 is input to the RF filter 506 and processed by the mixer circuit 508, resulting in a baseband signal. The resulting baseband signal is output from the RF processing module 502 and input to the baseband filter 512. The filtered output from the baseband filter 512 is input to the A / D converter module 514, where analog-to-digital conversion is performed. The resulting output digital signal is input to the digital filter 516 for additional filtering. The output of the digital filter 516, eg, the first signal component 517 originally supplied from the first base station cell / sector transmitter, is then input to the digital signal processing module 518, while another one. The output of the digital filter 516, for example, the second signal component 519 originally supplied from the second base station cell / sector transmitter, is output to the energy detection / SNR detection module 536. The digital signal processing module 518 includes a timing synchronization module 522, a decoder 523, and a signal quality detector 526. Therefore, the digital signal processing module 518 can completely decode broadcast information, as well as WT-specific information, such as information directed for one WT and not for another WT. It is possible.
The timing synchronization module 522 is used for timing synchronization of received data to be processed, for example, a received downlink signal. CDMA embodiments, as well as OFDM embodiments, are expected. The timing synchronization module 522 in the CDMA embodiment can be provided using known despreading techniques. The timing synchronization module 522 in the OFDM embodiment can be provided as a symbol timing reproduction circuit using a known technique. The decoder 523 is directed at the broadcast communication module 524 for decoding received broadcast signals, such as beacon signals, pilot signals, etc., and the specific WT300 to which the receiver 501 belongs to the WT. Includes a mobile-specific module 525 for decoding received downlink data / information, such as downlink traffic signals.
The signal quality detector 526 includes a signal energy measuring circuit 528, an SNR circuit 530 and / or an error estimator 532. The signal quality detector 526 obtains quality estimates for the channel from the first base station cell / sector transmitter to the WT300 used for downlink traffic channel signaling. The quality estimate is the output of the signal energy measurement circuit 528, the output of the SNR circuit 530, which is a function of the measured signal energy, and / or the measured error of the received data / information determined by the error estimator 532. Based on rate or estimated error rate. The quality estimation information 533, for example, the quality index value corresponding to the currently selected carrier band, is transferred to the area selection controller 512 for use in making the band selection band determination.
In the execution means of FIG. 4, the second signal component processing is performed by another set of receiver components, such as an optional timing synchronization module, an optional broadcast detector 534, and an energy detection / SNR detection module 536. Shown to be executed. However, it is highly appreciated that the elements of the digital signal processing module 518 can be used on a time-divided basis, where the first signal component and the second signal component and second to generate quality index values. The signal components of are of the same type, eg, OFDM signals. If the second signal component is a beacon signal or another signal that does not require timing synchronization and / or decoding to generate a quality indicator value, the timing synchronization module 520 and broadcast decoder 534 are omitted. May be done. However, if the first signal component corresponds to a first type of signal, eg, an OFDM signal, and the second signal component corresponds to a second type of signal, eg, a CDMA signal, then the first Separate signals and / or modules for generating signal quality values for the signal component of and the second signal component can be configured to handle different types of signals, eg, reconfigurable. It can be even more cost effective than using a simple circuit system.
In some embodiments, for example, in the CDMA embodiment, the second signal component 519 is processed via the timing synchronization module 520. The timing synchronization module 520 in the CDMA embodiment can be provided using known despreading techniques. In certain embodiments, for example, in various CDMA embodiments, the second signal component 519 is similarly processed via the broadcast decoder 534.
A second signal component, which may be subjected to the optional processing described above, is input to the energy detection and / or SNR detection module 536. The processed received signal component that is going to be evaluated by the energy detection and / or SNR detection module 536, for example, in some OFDM embodiments, transmits a second transmitter, for example, a first signal component. It can be a detected beacon signal transmitted from an adjacent cell / sector base station transmitter, with respect to one cell / sector base station transmitter. The processed received signal component evaluated by the energy detection and / or SNR detection module 536 is, for example, in some CDMA embodiments, a first transmitter transmitting a second transmitter, eg, a first signal component. It can be a detected pilot signal transmitted from an adjacent cell / sector base station transmitter associated with the cell / sector base station transmitter. The energy detection and / or SNR detection module 536 provides quality estimates for possible downlink channels between the second cell / sector base station transmitter and the WT300 corresponding to the second signal component evaluated. Generates information that can be used as signal quality estimate information 537. The quality estimates generated are based on signal energy measurements or SNR measurements that are a function of the detected signal energy. The signal quality estimation value information 537 is used, for example, as a first frequency band and a second frequency band corresponding to the first signal component and the second signal component, respectively, for use in making a band selection determination. Transferred to the band selection controller 510 for selection between.
In some embodiments, the energy detection and / or SNR detection module 536 is less computationally complex than the digital signal processing module 518 in either the number of gates or the number of executable instructions. This is possible, and decoding is often used, because in many cases it is not necessary to decode the received signal component in order to generate quality estimation information corresponding to the second signal component. In this case, it is possible to be limited to decoding the broadcast communication data, and the broadcast communication data is easier to decode than the mobile-specific data, because it is mobile-specific. Because of the type of coding used compared to the case of data and / or because the broadcast signal is intended to reach multiple mobile devices, rather than the power transmission level of the mobile-specific data. This is because the power transmission level of the broadcast communication data is high in many cases.
The signal component quality information (533,537) transferred from the digital signal processing module 518 and the energy detection and / or SNR detection module 536 respectively is used to make a decision regarding the setting of the carrier frequency band to be used by the RF processing module 502. Used by the band selection controller 510. For example, which band, and therefore which base station sector transmitter, should be selected to receive the downlink communication.
In certain embodiments, receiver 501 in FIG. 4 is a spread spectrum receiver that processes spectral spread signals such as CDMA and / or OFDM. In some OFDM embodiments, the optional timing synchronization module 520 corresponding to the second component is not used. In some OFDM embodiments, the broadcast decoder 534 may be used, while in another OFDM embodiment, the broadcast decoder 534 is not required and is omitted. In the embodiment in which the second signal component is a CDMA signal, the timing synchronization module 520 is used, but the broadcast communication decoder 534 may or may not be used.
The receiver 501 of FIG. 4 includes an I / O interface 507 connected to the digital signal processing module 518, the energy detection / SNR detection module 536 and the band selection controller 510 via the bus 509, and various elements via the bus. Can exchange data and information. In other embodiments, the bus 509 can be connected to another receiver component, such as the broadcast communication decoder 534 and / or the timing synchronization decoder 534. The receiver 501 can communicate with another element of the WT300 via the I / O interface 507 that connects the receiver 501 to bus 312. The decoded downlink traffic channel signal may be transmitted via interface 507 to one or more external devices and / or another WT component, such as a display.
FIG. 5 is an explanatory diagram 600 used to explain an embodiment of a specific example of the present invention using the single RF processing module receiver 500 of FIG. Two transmitters 602,604 in a cell, eg, from adjacent sectors A and B, respectively, transmit, for example, a normal traffic channel signal, eg, a downlink signal including user data, an optional pilot signal, and a beacon signal. I'm sending. Transmitters 602,604 can use different antennas pointed in the direction of different sectors or cells. The signaling from each sector transmitter is used within the carrier frequency band specified to itself, such as the assigned signal, the optional pilot signal, and / or the optional beacon signal, and in one cell. Includes one or more, eg, two other, beacon signals within the carrier frequency band. The BS sector A transmitter 602 has a carrier frequency f.<sub>0</sub> Within the frequency band 618 having 624, for example, a downlink signal 606 including a sector A downlink traffic signal, a sector A allocation signal, an optional sector A pilot signal, and / or an optional sector A beacon signal is transmitted. Carrier frequency f<sub>1</sub> Send an optional sector A beacon signal 608 within frequency band 620 with 626, and carrier frequency f<sub>2</sub> The sector A beacon signal 610 is transmitted within the frequency band 622 having 628. BS sector B transmitter 604 has a carrier frequency f<sub>2</sub> Within the frequency band 622 having 628, for example, a downlink signal 612 including a sector B downlink traffic signal, a sector B allocation signal, an optional sector B pilot signal, and / or an optional sector B beacon signal is transmitted. The BS sector B transmitter 604 also has a carrier frequency f.<sub>0</sub> Transmit a sector B beacon signal within frequency band 618 with 624, and carrier frequency f<sub>1</sub> The sector B beacon signal 616 is transmitted within the frequency band 620 having 626.
Embodiments of the receiver 630, for example, the receiver 500 of FIG. 4, are the carrier frequency f.<sub>0</sub> It is tuned to the frequency band 618 with 624. The receiver 630 receives two signal components 632,634. For example, the first signal component 632, including the normal signaling, allocation signal, pilot signal, and / or beacon signal from BS sector A transmitter 602, is processed by the digital signal processing module 518, while the second. The signal component 634, eg, the beacon signal from the BS sector B transmitter 604, is processed by the energy detection / SNR detection module 536. From the first component 632 and using the digital signal processing module 518, the receiver 630 has a carrier frequency f.<sub>0</sub> 624 and frequency band 618 are used to determine the quality estimate of the downlink traffic channel from the BS sector A transmitter to the receiver 630. From the second component 634 and using the energy detection / SNR detection module 536, the receiver 630 has a carrier frequency f.<sub>2</sub> 628 and frequency band 622 are used to determine quality estimates of possible alternative downlink traffic channels between BS sector B transmitter 604 and receiver 630.
In certain embodiments of the invention, the beacon signal may not be used, and another downlink signal may be received and processed for band selection determination. For example, each sector and / or cell transmitter may have a plurality of downlink signals, such as an assigned signal, sector / in the frequency band used by the transmitter for normal downlink traffic channel signaling. Transmits cell base station identification signals and / or pilot signals, and is also used by another, eg, adjacent, sector / cell transmitter for normal downlink traffic signaling of another transmitter. It transmits multiple additional downlink signals within another frequency band, eg, sector / cell base station identification signals, and / or pilot signals. Transmissions within another frequency band may occur at regular intervals, and there may correspond to a short period of time associated with the transmission of the signal into the corresponding sector by the transmitter. ..
A receiver, such as the single RF chain receiver 500 in FIG. 4, is tuned to one frequency band according to the present invention, but from multiple cell and / or sector transmitters transmitting within that frequency band. Receives the downlink signal component of. The receiver receives and processes a composite signal, a composite signal within a tuned frequency band, a composite signal containing a first signal component and a second signal component from two different transmitters. The information can be generated from a first signal component and a second signal component, which ensures quality indicator information for two alternative frequency bands, each frequency band corresponding to a different signal component. Can be used for, and is used.
In one particular embodiment of OFDM (Orthogonal Frequency Division Multiplexed), the beacon signal is, for example, one or a few tones, as a narrow signal in terms of frequency. It is given as a relatively high power signal to be transmitted. When the beacon signal is transmitted in the OFDM embodiment of the embodiment, most of the transmission power is concentrated on one or a few tones that include the beacon signal. In some embodiments, the first signal component 632 comprises a beacon signal component corresponding to the first transmitter, while the second signal component is a second, eg, usually another sector and /. Alternatively, it includes a beacon signal corresponding to another transmitter corresponding to the cell. In one such embodiment, carrier selection is based on the evaluation of the beacon signal. In some embodiments, the beacon signal has a narrow frequency width relative to the band of the passband filter, eg, at most 1/20 of the frequency width of the passband filter.
According to the present invention, the first signal component and the second signal component can be transmitted simultaneously, for example, on different frequencies within the currently selected band. Alternatively, the first signal component and the second signal component can be transmitted and received continuously. 6A and 6B are flowcharts 700 illustrating a method of a specific example of operating a communication system according to the present invention. FIG. 6 comprises the combination of FIGS. 6A and 6B. The operation begins at step 702, where the communication system is initialized, eg, the base station is reinitialized, and the mobile node is powered on. The operation proceeds from step 702 to step 704.
In step 704, the first base station transmitter, which mainly transmits in the first frequency band, is operated to transmit the first signal component within the first frequency band. The operation proceeds from step 704 to step 706. In step 706, the second base station transmitter, which mainly transmits in the second frequency band, is such that the second signal component is transmitted, for example, periodically in the first frequency band. Is operated. In step 708, the first base station transmitter is operated to transmit signals in the second frequency band, which is different from the first frequency band, for example, periodically. In one embodiment, the second frequency band is completely out of range of the first frequency band, while in another embodiment, it is partially divided into a first frequency band and a second frequency band. There can be multiple overlaps. In certain embodiments, the first transmitter and the second transmitter are placed in different sectors of the same cell; the first signal component is the first antenna or the first of the same cell. The second signal component is transmitted using the antenna element corresponding to the sector; and the second signal component is transmitted using the second antenna or the antenna element corresponding to the second sector of the same cell. In some embodiments, the first transmitter and the second transmitter are placed in separate cells. In such an embodiment, the first signal component is transmitted using the antenna element corresponding to the first antenna or first cell, and the second signal component is the second antenna or second antenna. It is transmitted using the antenna element corresponding to cell 2. The operation proceeds from step 708 to step 710.
In step 710, the receiver of the mobile node is operated to receive a signal that includes a first component and a second signal component. In certain embodiments, the signal is received over a period of time, and the first and second signal components are received at different points of time. In certain embodiments, the first signal component and the second signal component are received at the same time, for example, on different frequencies within the range of the first frequency band.
Then, in step 712, the passband filter in the receiver of the mobile node is operated to pass the first signal component and the second signal component, and the first signal component and the second frequency are passed. The components are within the selected frequency band. The passband filter removes signals outside the range of the first frequency band. In some embodiments, for example, in the OFDM embodiment where the first signal component and the second frequency component are beacon signals, the first signal component and the second signal component are the width of the passband filter. The frequency width is narrower than that of the above, for example, the frequency width of the pass band filter is at most 1/20. In certain embodiments, the first frequency band and the second frequency band are at least 1 MHz wide, and the passband filter has a passband narrower than 2 MHz wide.
The operation proceeds from step 712 to step 714. In step 714, the mobile node operates to perform a first signal measurement on the first signal component to generate a first signal quality index. In step 716, the mobile node operates to perform a second signal measurement on the second signal component to generate a second signal quality index. The operation proceeds from step 716 to step 718. In step 718, the mobile node operates in the first frequency band and in the second frequency band related to the second frequency component as a function of the first quality index and the second quality index. It works to choose between working and working. The operation proceeds from step 718 to step 720.
In certain embodiments, the receiving step 710, the filtering step 712, and the measuring steps 714,716 are repeated multiple times, and the selection between the first frequency band and the second frequency band of step 718 is selected. What is done is performed after the second quality index exceeds the first quality index during a predetermined interval, for example, a time interval of a predetermined period or a certain number of signal measurements. This is done to prevent switching bands in response to short periods of time or transient changes in state.
In certain embodiments, the choice is based on a predetermined threshold. For example, the selection may include: the lower of the first signal quality value and the second signal quality value if they both exceed the predetermined threshold during a predetermined interval. It is to select the frequency band corresponding to the signal quality value. Therefore, the lower quality, eg, the lower power band, can be selected if both signal components exhibit satisfactory conditions, freeing the higher power band and another one. To be used by mobiles.
Select if one of the first signal quality value and the second signal quality value is lower than the predetermined threshold value, thereby selecting a better band when signal quality is an issue. This can include selecting the frequency band corresponding to the higher signal quality value. The first signal quality value decreases over time, and the second signal quality value increases over time, and the difference between the first quality value and the second quality value changes the sign. If this indicates that the wireless terminal is heading towards the transmitter of the second signal component and away from the transmitter of the first component, then the selection is in the second frequency band. It is possible to include the selection of as well.
In certain embodiments, the step of selection is a function of the mobile node, eg, the quality of service (QoS) that is being provided to the user, and the function of selection is about to be provided to the user. It changes according to the information indicating the change in QoS. This change can be given as a change in the threshold quality used by the selection module to select the frequency band.
In certain embodiments, the step of choice is a function of communication system loading, and the method further receives information that is an indicator of communication system loading, eg, from a base station, and communication system. It comprises a moving body node that modifies the selected function in response to instructions for change in loading. For example, if the wireless terminal detects frequent use of the first frequency band, the selection can change the weights used in making the selection decision, giving it a stronger priority over the second frequency band. Create rights.
In step 720, the operation is managed based on whether the first frequency band is selected or the second frequency band is selected. If the first frequency band is selected, the operation proceeds to step 704 via the connection node A722: However, if the second frequency band is selected, the operation proceeds to step 724.
In step 724, the passband filter is controlled to pass through the second band instead of the first band. The operation proceeds from step 724 to step 728 via the connection node B726.
In step 728, a second base station transmitter, which primarily transmits within a second frequency band, is operated to transmit a third signal component within said second frequency band. In step 730, the first base station transmitter or the third base station transmitter, which mainly transmits within the first frequency band, sends the fourth signal component within the second frequency band. Behaved to send. In step 732, the second base station is operated to transmit a signal within the first frequency band. In step 734, the receiver of the mobile node is operated to receive a signal containing a third signal component and a fourth signal component. The operation proceeds from step 734 to step 736. In step 736, the passband filter in the mobile node is operated to pass a third and fourth signal component within the second frequency band. In step 738, the mobile node is operated to perform a third signal measurement on the third signal component to generate a third signal quality indicator. In step 740, the mobile node is operated to perform a fourth signal measurement on the fourth signal component to generate a fourth signal quality indicator. The operation proceeds from step 740 to step 742.
In step 742, the mobile node operates in the first frequency band and in the second frequency band as a function of the third signal quality index and the fourth signal quality index. Behaved to select. The operation proceeds from step 742 to step 744.
In step 744, the operation proceeds based on whether a first frequency band or a second frequency band is selected. If the second frequency band is selected, the operation proceeds from step 744 to step 728 via the connection node C748. However, if the first frequency band is selected, the operation proceeds from step 744 to step 746, where the passband filter in the mobile node is said to replace the second frequency band. It is controlled to pass through the first frequency band. The operation proceeds from step 746 to step 704 via the connection node A722.
FIG. 7-12 is used to illustrate the signal and band selection of a specific example by a wireless terminal receiver of a specific example according to the present invention.
FIG. 7 shows a portion of a specific example wireless communication system 800 that is implemented in accordance with the present invention and supports multicarrier and spread spectrum OFDM signaling. System 800 may be an embodiment of a specific example of system 100 of FIG. FIG. 7 includes a plurality of specific examples of multi-sector cells, cell 1 802, cell 2 804, and cell 3 806. Each cell (802,804,806) represents a wirelessly communicable area for the base station (BS), (BS1 808, BS2 810, BS3 812), respectively. BS808,810,812 can be the BS200 of the embodiment of the embodiment of FIG. BS808,810,812 are connected together over a network and connected to another network node and the Internet. In the embodiment of the specific example, each cell 802,804,806 includes three sectors (A, B, C). Cell 1 802 includes sector A814, sector B816, and sector C818. Cell 2 804 includes sector A820, sector B822, and sector C824. Cell 3 806 includes sector A826, sector B828, and sector C830. FIG. 7 also includes a specific example WT801 implemented in accordance with the present invention. WT801 can be an embodiment of a specific example of WT300 in FIG. The current connection point for the WT801 in the specific example is the sector 3 818 transmitter on BS1 808. WT801 is moving towards BS2 810 as indicated by arrow 803.
FIG. 8 is an example of a wireless terminal receiver 901 / antenna 902 combination 900 of a specific example given according to the present invention. The receiver / antenna combination 900 of FIG. 8 can be used as the receiver 302 / antenna 312 combination in the WT300 of FIG. 3 or the WT801 of FIG. Receiver 901 illustrates a receiver of an embodiment according to the present invention, which is capable of processing multiple components of a received signal contained within the same selected carrier band. Each component transmits different information, eg, information corresponding to different carrier bands transmitted by different transmitters and / or different transmitting antennas. The embodiment of FIG. 8 is suitable when both signal components are communicated using the same technique, eg, the same type of modulation.
The receiver 901 in FIG. 8 uses a single RF processing chain that includes a single RF processing module (frequency synchronization module) 902. The receiver 901 is connected to the antenna 904, which receives downlink signals from a plurality of sector / cell base station transmitters. The antenna 904 is connected to the RF processing module 902. The RF processing module 902 includes a controllable RF filter 906 and a mixer circuit 908. The RF filter 906 can be given as a passband filter and acts as a frequency synchronization circuit. The RF processing module 902 is tuned to the carrier frequency selected by the band selection controller 910. The RF filter passes the received signal components within the selected carrier band and removes at least some signal components outside the selected carrier band.
The passband signal received from the antenna 904 is input to the RF filter 906 and processed by the mixer circuit 908 to result in a baseband signal. The resulting baseband signal is output from the RF processing module 902 and input to the baseband filter 912. The filtered output from the baseband filter 912 is input to the A / D converter module 914, where the analog-to-digital conversion is performed. The resulting output digital signal is input to the digital filter 916 for additional filtering. The output of the digital filter 916 is input to the digital signal processing module 918. The digital signal processing module 918 includes a timing synchronization module 922, a decoder 923, a beacon identification module 927, and a signal quality detector 926. Therefore, the digital signal processing module 918 can completely decode WT-specific information, such as information directed to individual WTs rather than other WTs, as well as broadcast communication information.
The timing synchronization module 922 is used for timing synchronization of received processed data, for example, a received downlink signal. The timing synchronization module 922 can be provided as a symbol timing reproduction circuit using known techniques. The decoder 923 provides the broadcast communication module 924 for decoding received broadcast signals, such as allocation signals, pilot signals, etc., and the specific WT300 (or WT801) to which the receiver 901 belongs. Includes a mobile-specific module 925 for decoding received downlink data / information directed against, eg, a downlink traffic signal.
Beacon identification module 927 identifies received beacon signals processed using a particular base station sector transmitter associated with a particular carrier frequency used for its main downlink signaling. Each beacon signal can be, for example, a signal that occupies one OFDM symbol time in which all or nearly all sector transmitter energy is concentrated in one tone. Due to the characteristics of the OFDM beacon signal, the beacon identification module 927 can identify the beacon signal without having to process the signal through the timing synchronization module 922 or the decoder module 923.
The signal quality detector 926 includes a signal energy measurement circuit 928 and an SNR circuit 930. The signal quality detector 926 produces quality estimates for different channels from multiple base station cell / sector transmitters to the WT300 based on the measurements of the identified beacon signal received. Quality estimates are based on the signal energy measurement circuit 928 output and / or the SNR circuit 930 output, which is a function of the measured signal energy. The signal quality estimation information 933,935,937 corresponding to each received identified beacon, for example, the quality index value, is transferred to the band selection controller 910 and used when making a band selection determination.
The signal quality estimation information (933,935,937) transferred from the digital signal processing module 918 is used by the band selection controller 910 to make decisions about the carrier frequency band setting that is going to be used by the RF processing module 902, eg. Which band and therefore which base station sector transmitter should be selected to receive downlink communication.
The receiver 901 of FIG. 8 includes an I / O interface 907 connected to the digital signal processing module 918 and the band selection controller 910 via the bus 509, and various elements can exchange data and information via the bus. In other embodiments, the bus 509 may be connected to another receiver component, eg, a digital filter 916. The receiver 901 can communicate with another element of the WT300 via the I / O interface 907 that connects the receiver 901 to bus 312. The decoded downlink traffic channel signal can be transmitted via the I / O interface 907 to one or more external devices and / or another WT component, such as a display.
In FIG. 8, the output of the bandwidth selection controller 910 is used to control the RF processing module 902. In other embodiments, the band selection controller 910 may be connected to a digital filter 916 and / or a digital signal processing module 918, and the output of the band selection controller 910 is a digital filtering 916 and / or a digital signal. It can be used to control the processing module 918. In such cases, the RF processing module 902 receives and passes a wide portion of the received signal, eg, multiple bands, and the digital filtering 916 and / or the digital signal processing module 918 is a control signal or band selection. According to the signal received from the controller 910, select a portion of the received signal for further processing and filtering, or discard the rest of the received signal.
FIG. 9 is FIG. 1000 illustrating transmitter signaling of a specific example according to the present invention. It is assumed that there is a specific example wireless terminal in a multi-sector wireless communication system 800 with 3 sectors per cell in the specific example of FIG. 7 using the 5 MHz global system BW1001, such as the WT801. Wireless terminal 801, for example, a moving mobile node is currently located in system 800, resulting in multiple signals from BS cell 1 sector C transmitter 1002, from BS cell 2 sector B transmitter 1004. It is assumed that it is possible to receive a plurality of signals, a plurality of signals from the BS cell 3-sector transmitter 1006. The WT801 was previously closest to transmitter 1002, but now assumes it is closest to transmitter 1004.
BS cell 1 sector C transmitter 1002 has a carrier frequency f within the range of 1.25MHz BW band 1010.<sub>0</sub> Use 1008 to send the downlink signal 1020. Signal 1020 includes downlink traffic signal 1021 for WT represented by a small rectangle and beacon signal 1024 represented by a large blackened rectangle. Beacon signals are shown in larger sizes than regular signals, demonstrating that beacon signals have much greater transmit energy concentration per tone than regular signals and detect such signals. It's easy. The downlink traffic signal 1022 directed to the particular WT801 of interest, such as the spread spectrum OFDM signal, is blacked out. Moreover, the BS cell 1 sector C transmitter 1002 has a carrier frequency f.<sub>1</sub> Transmits the downlink signal 1026 within the 1.25MHz BW band 1014 with 1012. The downlink signal 1026 includes a beacon signal 1028. BS cell 1 sector C transmitter 1002 has a carrier frequency f<sub>2</sub> Transmits the downlink signal 1030 within the 1.25MHz BW band 1018 with 1016. The downlink signal 1030 includes a beacon signal 1032. In an embodiment of this embodiment, the beacon signal (1024,1028,1032) and the conventional signaling (1021) are transmitted by transmitter 1002 at different times. Most of the time, transmitter 1002 transmits normal downlink signaling 1021, but sometimes, for example, periodically, transmitter 1002 has the total or nearly total sector transmission power concentrated on the beacon signal. Then, instead of normal signaling, a beacon signal (1024,1028, or 1032) is transmitted. The timing sequence can be constructed so that the transmitter 1002 circulates the beacons 1024,1028,1032 repeatedly.
The BS cell 2-sector B transmitter 1004 has a carrier frequency f within the range of 1.25 MHz BW band 1014.<sub>1</sub> The 1012 is used to transmit the downlink signal 1038. Signal 1038 includes a downlink traffic signal 1040 for the WT represented by a small rectangle and a beacon signal 1042 represented by a large blackened rectangle. Moreover, the BS cell 2-sector B transmitter 1004 transmits the downlink signal 1034 within the frequency band 1010. The downlink signal 1034 includes a beacon signal 1036. The BS cell 2-sector B transmitter 1004 similarly transmits the downlink signal 1044 within the frequency band 1018. The downlink signal 1044 includes the beacon signal 1046. In an embodiment of this embodiment, the beacon signal (1036,1042,1046) and the conventional signaling (1040) are transmitted by transmitter 1004 at different times. Most of the time, transmitter 1004 transmits normal downlink signaling 1040, but sometimes, for example, periodically, transmitter 1004 has total or nearly total sector transmission power focused on the beacon signal. Then, instead of normal signaling, a beacon signal (1036, 1042, or 1046) is transmitted. The timing sequence can be constructed so that the transmitter 1004 circulates the beacons 1036,1042,1046 repeatedly.
BS cell 3-sector A transmitter 1006 has a carrier frequency f within the range of 1.25MHz BW band 1018.<sub>2</sub> Use 1016 to send the downlink signal 1056. Signal 1056 includes a downlink traffic signal 1058 for the WT represented by a small rectangle and a beacon signal 1060 represented by a large blackened rectangle. Moreover, the BS cell 3-sector A transmitter 1006 transmits the downlink signal 1048 within the frequency band 1010. The downlink signal 1048 includes the beacon signal 1050. The BS cell 3-sector A transmitter 1006 similarly transmits the downlink signal 1052 within the frequency band 1014. The downlink signal 1052 includes a beacon signal 1054. In an embodiment of this embodiment, the beacon signal (1050,1054,1060) and the conventional signaling (1058) are transmitted by transmitter 1006 at different times. Most of the time, transmitter 1006 transmits normal downlink signaling 1058, but sometimes, for example, periodically, transmitter 1006 has total or nearly total sector transmission power focused on the beacon signal. Then, instead of normal signaling, a beacon signal (1050,1054, or 1060) is transmitted. The timing sequence can be constructed so that the transmitter 1006 circulates the beacons 1050, 1054, 1060 repeatedly.
In an embodiment of this embodiment, each of the beacon signals (1024,1028,1032,1036,1042,1046,1050,1054,1060) is transmitted at the same transmit power level. In other embodiments, different transmit power levels can be used for different beacon signals and the WT knows the transmit power assigned to each beacon signal or is assigned to different beacon signals. It is provided to know the relationship between multiple transmit power levels.
FIG. 10 is FIG. 1100 for explaining the composite signal 1002 of a specific example in the receiving antenna of the WT receiver 801 and the related frequency information. Signal 1102 contains components 1104,1106,1108,1110,1112,1114, and 1116. Components 1104, 1108, 1112, and 1116 represent noise signals outside the frequency bands of interest 1010, 1014, 1018.
Signal 1106 has a carrier frequency f<sub>0</sub> Represents a received copy of a composite of signals 1020, 1034, and 1048 transmitted within band 1010 with 1008; signal 1106 also contains additional noise. The transmitted beacon signal 1024 and the usual signaling 1021,1022 have become intermediately weakened, for example due to channel gain, resulting in received signals (1024', 1021', 1022'). .. The transmitted beacon signal 1036 has been slightly reduced in strength, for example due to channel gain, resulting in the received beacon signal 1036'. The intensity of the beacon signal 1050 has been significantly reduced, for example due to channel gain, resulting in the received beacon signal 1050'. Similar to those described for FIG. 9, the signals 1024', 1022' and 1021', 1050'and 1036' of FIG. 10 may be received at different time moments.
Signal 1110 has a carrier frequency f<sub>1</sub> Represents a composite received copy of signals 1026,1038,1052 transmitted within band 1014 with 1012; signal 1110 also contains additional noise. The transmitted beacon signal 1042 and the normal signaling 1040 have been slightly reduced in strength, for example due to channel gain, resulting in the received signal (1042', 1040'). The transmitted beacon signal 1028 is, for example, intermediately reduced in strength due to channel gain, resulting in the received beacon signal 1028'. The transmitted beacon signal 1054 has been significantly reduced in strength, for example due to channel gain, resulting in the received beacon signal 1054'.
Signal 1114 has a carrier frequency f<sub>2</sub> Represents a composite received copy of signals 1030,1044,1056 transmitted within band 1018 with 1016; signal 1114 also contains additional noise. The transmitted beacon signal 1060 and the normal signaling 1058 have been significantly reduced in strength, for example due to channel gain, resulting in received signals (1060', 1058'). The transmitted beacon signal 1032 is, for example, intermediately reduced in strength due to channel gain, resulting in the received beacon signal 1032'. The transmitted beacon signal 1046 is, for example, slightly weakened due to channel gain, resulting in the received beacon signal 1046'.
FIG. 11 is FIG. 1200 illustrating the processing of the specific example of the received signal 1102 of the composite of the specific example of FIG. 10 by the receiver 900 of FIG. 8 according to the present invention. The WT801 containing the receiver 900 is currently connected to BS1 sector 3 which uses the transmitter 1002 for downlink traffic signaling, and therefore the RF processing module 902 is the signal 1202 from the bandwidth controller 910. Controlled by carrier frequency f<sub>0</sub> Select band 1010 to use 1008. The RF processing module 902 extracts the baseband signal 1106', a filtered display of the information contained in the signal 1106, from signal 1102. Signal 1106'is the normal signaling 1021', specifically directed for WT801, and the beacon, corresponding to the signal (1021', 1022', 1024', 1036', 1050'), respectively. Includes signals 1024 ", 1036", 1050 ".
Arrows 1206 represent additional processing by receiver chain components 912,914,916, such as baseband filtering, A / D conversion, and digital filtering. The signal is then input to the digital signal processing module 918. Beacon identification module 927 identifies the beacon signal 1024 as related to cell 1 sector C transmitter 1002. Transmitter 1002 has a carrier frequency as its own allocated band for downlink traffic channel communication. f<sub>0</sub> Use 1008 and band 1010. Beacon identification module 927 identifies the beacon signal 1036 as related to cell 2 sector B transmitter 1004. Transmitter 1004 has a carrier frequency as its own allocated band for downlink traffic channel communication. f<sub>1</sub> Use 1012 and band 1014. Beacon identification module 927 identifies the beacon signal 1050 as related to cell 3 sector A transmitter 1006. Transmitter 1006 has a carrier frequency as its own allocated band for downlink traffic channel communication. f<sub>2</sub> Use 1016 and band 1018.
The identified beacon information and beacon signals 1024 ", 1036", and 1050 "are transferred to the signal quality detector 926, where energy holdings and / or SNR information is acquired and the beacon signal (1024". , 1036 , 1050) corresponding quality estimation information (933,935,937) is generated. In this OFDM embodiment, beacon identification, beacon signal measurement, and signal quality indicator generation are performed without the use of a timing synchronization module or the need to decode modulated information from the beacon signal. In other embodiments, the information can be modulated onto a beacon signal, and a broadcast decode module may be used. Moreover, in other embodiments, additional information may be taken into account when generating quality estimates. For example, the error rate of information decoded from a received normal signal 1022 ", eg, a downlink traffic channel signal directed to a particular WT801, evaluates the quality of the channel corresponding to the beacon signal 1024". Sometimes considered. Moreover, the ratio between multiple beacon signals is used in determining the level of interference when another detected beacon signal may correspond to the same carrier, for example from another cell. Can be done.
Quality estimation information 1 933 is based on the energy and / or signal-to-noise ratio estimates of the processed beacon signal 1024, and the carrier frequency f.<sub>0</sub>Corresponds to the transmitter 1002 using. Quality estimation information 2 935 is based on the energy and / or signal-to-noise ratio estimates of the processed beacon signal 1036, and the carrier frequency f.<sub>1</sub>Corresponds to the transmitter 1004 using. Quality estimation information 1 937 is based on the energy and / or signal-to-noise ratio estimates of the processed beacon signal 1050 and the carrier frequency f.<sub>2</sub>Corresponds to the transmitter 1006 using.
The bandwidth selection controller receives the information 933,935 and 937 and determines that the quality of channel 2 is better than the quality of channel 3 and that the quality of channel 1 is better than the quality of channel 1 and that the WT801 should change the connection point. At the appropriate time, for example, to minimize service interruption, the bandwidth selection controller 910 sends signal 1202'to RF processing module 902 at frequency f.<sub>1</sub>Change the selection to.
FIG. 12 is FIG. 1300 illustrating transmitter signaling of a specific example after the WT801 has changed its band selection and connection points. The WT801 can receive a plurality of signals from the BS cell 1 sector C transmitter 1002, the signal from the BS 2 sector B transmitter 1004, and the signal from the BS 3 sector transmitter 1006. The WT801 was previously closest to transmitter 1002, but now assumes it is closest to transmitter 1004.
The BS cell 1 sector C transmitter 1002 has a carrier frequency f within the band 1010.<sub>0</sub> The 1008 is used to transmit the downlink signal 1320. Signal 1320 includes downlink traffic signal 1321 for multiple WTs represented by small rectangles, and beacon signal 1024 represented by large blackened rectangles. Moreover, the BS cell 1 sector C transmitter 1002 has a carrier frequency f.<sub>1</sub> The downlink signal 1326 is transmitted to the frequency band 1014 having 1012. The downlink signal 1326 includes the beacon signal 1028. The BS cell 1 sector C transmitter 1002 similarly has a carrier frequency f.<sub>2</sub> The downlink signal 1330 is transmitted to the frequency band 1018 having 1016. The downlink signal 1330 includes a beacon signal 1032.
The BS cell 2-sector B transmitter 1004 has a carrier frequency f within the band 1014.<sub>1</sub> Use 1012 to send the downlink signal 1338. Signal 1338 is a downlink traffic signal 1340 for multiple WTs represented by a small rectangle containing a downlink traffic signal 1341 for a particular WT801 represented by a small blackened rectangle, and a large blackened rectangle. Includes the beacon signal 1042 represented by. Moreover, the BS cell 2-sector B transmitter 1004 transmits the downlink signal 1334 to the frequency band 1010. The downlink signal 1334 includes the beacon signal 1036. The BS cell 2-sector B transmitter 1004 similarly transmits the downlink signal 1334 to the frequency band 1018. The downlink signal 1334 includes the beacon signal 1046.
BS cell 3-sector A transmitter 1006 has a carrier frequency f within band 1018.<sub>2</sub> Use 1016 to send the downlink signal 1356. Signal 1356 includes downlink traffic signal 1358 for multiple WTs represented by small rectangles, and beacon signal 1060 represented by large blackened rectangles. Moreover, the BS cell 3-sector A transmitter 1006 transmits the downlink signal 1348 to the frequency band 1010. The downlink signal 1348 includes the beacon signal 1050. The BS cell 3-sector A transmitter 1006 similarly transmits the downlink signal 1352 to the frequency band 1014. The downlink signal 1352 includes the beacon signal 1054.
FIG. 13 is FIG. 1400 of a specific example of the Beacon signal 1420 having a timing offset 1418 with respect to adjacent sectors, which is illustrated for the purpose of further explaining the features of the present invention. FIG. 13 includes a specific example of the WT1402 given in accordance with the present invention, eg, the WT801 of FIG. It is assumed that the example system is an OFDM spectral spread frequency hop system that uses beacon signaling according to the present invention. Timeline 1404 represents the time at WT receiver 1402, where WT1402 is currently connected to a BS1 sector C transmitter and the carrier frequency band of that transmitter is currently used for downlink traffic channel signaling. And assume that the WT1402 has synchronized OFDM symbol timing with respect to the BS1 sector C transmitter. Three consecutive OFDM symbol time intervals (1406,1408,1410) are shown for BS1 sector C transmitter communication. Similarly, three consecutive OFDM symbol time intervals (1412, 1414, 1416) are shown for BS2 sector B transmitter communication. Each OFDM symbol time interval (1406,1408,1410,1412,1414,1416) is approximately the same period; however, between the start of the BS1 sector C OFDM symbol time interval and the start of the BS2 sector B OFDM symbol time interval. Has a 10% offset 1418. This timing offset is due to differences between multiple base station timing generators, such as different exact start times, and / or differences due to different distances between the WT1402 and each base station transmitter. Can be.
The BS cell 2-sector B OFDM beacon signal 1420 has been communicated to the WT1402 as indicated by arrow 1422. During the time interval 1414, the BS cell 2-sector B OFDM beacon signal 1420 appears at the WT receiver 1402. However, since the WT is connected and synchronized to the BS1 sector C transmitter, the WT1402 only detects 90% of the energy of the beacon signal 1420 and loses, for example, the last 10% of the signal. However, this relatively high level of energy detection and a relatively small amount of related uncertainty are often sufficient to support the comparison of multiple beacon signals from adjacent cells and / or adjacent sectors. Is. According to the present invention, in multiple OFDM embodiments, the receiver does not need to resynchronize the receiver with respect to the timing for each beacon signal processed.
Although described primarily in the context of OFDM systems, the methods and devices of the invention are applicable to a wide range of communication systems, including many non-OFDM and / or non-cellular systems.
In various embodiments, the nodes described herein are given using one or more modules and the steps corresponding to one or more methods of the invention, eg, carrier bandwidth. Perform selection, digital signal processing, energy detection / SNR detection, decoding, timing synchronization, signal quality detection, etc. In certain embodiments, the various features of the invention are implemented using multiple modules. Such modules can be run using software, hardware, or a combination of software and hardware. Many of the methods or steps of methods described above are general purpose with or without machines, eg, additional hardware, to perform all or part of the methods described above, eg, on one or more nodes. To control a computer, using a memory device, eg, a machine-executable instruction such as software contained in a machine-readable medium such as RAM, floppy disk®, etc. Can be executed. Thus, among others, the present invention relates to machines, such as processors and related hardware, in order to perform one or more steps of the methods described above. Aimed at a machine-readable medium that contains machine-executable instructions to operate.
Many further modifications of the methods and devices of the invention described above will be apparent to those skilled in the art in light of the above description of the invention. Such modifications should be considered within the scope of the present invention. The methods and devices of the present invention, and in various embodiments, CDMA communication technology, orthogonal frequency division multiplexing (OFDM) communication technology, and / or various other types of communication technology, which comprises multiple access. It can be used with, which can be used to provide a wireless communication link between a node and a mobile node. In certain embodiments, the access node is provided as a base station that establishes a communication link with a mobile node using OFDM and / or CDMA. In various embodiments, the mobile node is a notebook computer, personal data assistant (PDA), or receiver / transmitter circuit and logic element and / or routine for performing the methods of the invention. Runs as other portable devices, including.
100 ... Wireless Communication Systems, 133,135,137,139,141,143 ... Wireless Links, 170,172,174,176 ... Network Links, 216,226,228 ... Antennas, 214 ... Buses, 310 ... Buses, 312,338 ... Antennas, 500. .. Receiver / Antenna Combination, 508 ... Mixer Circuit, 509 ... Bus, 618,620,622 ... Frequency Band, 900 ... Receiver / Antenna Combination, 1020 ... Downlink Signal, 1021 ... Downlink traffic signal to WT, 1022 ... Downlink traffic signal directed to a specific WT of interest, 1024 ... Beacon signal, 1026,1030 ... Downlink signal, 1028,1032 ... Beacon signal.
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Numbers
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- Publication, EPODOC
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Titles2
- Japanese
- 1つのキャリアに同調された単一受信機チェーンを使用して複数のキャリア間で選択するための方法及び装置
- English
- Methods and equipment for selecting between multiple carriers using a single receiver chain tuned to one carrier
Classification
- CPC, 9
- H04B1/005
- H04B17/40
- H04B1/1027
- H04B1/406
- H04B17/327
- H04B17/382
- H04B1/38
- H04B1/00
- H04B17/00
- IPC, 11
- H04W36 00
- H04B1 00
- H04B1 10
- H04B1 40
- H04B1 707
- H04B15 00
- H04B17 00
- H04B17 40
- H04J13 00
- H04W36 18
- H04W36 30
