A system and method for achieving extended radio coverage and additional capacity using extended frequency bands
Abstract
(57) [Summary] The present invention provides increased geographic coverage and system capacity for mobile / portable radio transceivers that use adjacent and typically separate radio communication frequency bands. Radios that transmit and receive in exactly one frequency band are adapted to include configurable duplexers so that they can communicate in the extended frequency band. The duplex circuit is connected between the radio antenna, the radio transmitter and the receiver. Multiple switches are selected to configure different antennas, duplex circuits, receivers, and transmitters to allow communication in the first or second set of transmit / receive frequency bands, depending on the operating mode of the wireless transceiver. Works like. In one preferred embodiment, only a single duplexer is employed and is connected to the antenna and transmit / receive circuit via multiple switches.
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- 1【特許請求の範囲】 1. 第1及び第2の組の周波数で、第1及び第2の動作モードにおいて夫々情 報を送受信する能力を持つ無線トランシーバであって、各組の周波数は送信周波 数帯域及び受信周波数帯域を含み、前記無線トランシーバは、 送信機と、 受信機と、 アンテナと アンテナ、送信機、及び受信機に接続される二重化回路と、 第1及び第2の構成において、二重化回路をアンテナ、送信機、及び受信機に 選択的に接続するスイッチ回路と、 コントローラであって、このコントローラは、この無線機が第1の動作モード において動作している時は、第1の構成において、二重化回路をアンテナ、送信 機、及び受信機に接続するためにスイッチング回路を制御し、また無線機が第2 の動作モードにおいて動作している時は、第2の構成において、二重化回路をア ンテナ、送信機、及び受信機に接続するためにスイッチング回路を制御するコン トローラと、を包含する無線トランシーバ。 2. 請求項1の無線機において、二重化回路は、 無線機が第1の動作モードにある時、コントローラによりアンテナと送信機と 受信機との間に切替え可能に接続される第1のデユープレクサと、 無線機が第2の動作モードにある時、コントローラによりアンテナと送信機と 受信機との間に切替え可能に接続される第2のデユープレクサとを含む、無線ト ランシーバ。 3. 請求項2の無線機において、第2の組の周波数は、セル式無線送信及び受 信周波数帯域に対応し、第2のデユープレクサはセル式無線送信及び受信周波数 を二重化するように設計されており、また第1の組の周波数は、陸上移動体無線 (LMR)無線送信及び受信周波数帯域に対応し、第1のデユープレクサはLM R無線送信及び受信周波数を二重化するように設計されている、無線トランシー バ。 4. 請求項1の無線機において、二重化回路は1つのデユープレクサのみを含 み、コントローラは、第2の動作モードにおいて、アンテナからの受信した情報 を当該1つのデユープレクサを通り受信機へ経路決めするようにスイッチング回 路をセットし、また第1の動作モードにおいて、アンテナからの受信した情報を 受信機へ経路決めする時当該デユープレクサをバイパスするようにスイッチング 回路をセットする、無線トランシーバ。 5. 請求項4の無線トランシーバにおいて、当該無線機が第1及び第2の周波 数帯域において第1及び第2の動作帯域において夫々送信している時、コントロ ーラは、アンテナへの送信される信号を当該1つのデユープレクサを通り経路決 めするようにスイッチング回路をセットする、無線トランシーバ。 6. 請求項1の無線トランシーバにおいて、第1及び第2の組の周波数に対す る送信周波数帯域は接触しており、また第1及び第2の組の周波数に対する受信 周波数帯域は接触している、無線トランシーバ。 7. 請求項6の無線トランシーバにおいて、第1の受信周波数帯域は851- 869MHz、第1の送信周波数帯域は806-824MHz、第2の受信周波 数帯域は869-894MHz、及び第2の送信周波数帯域は824-849M Hzである、無線トランシーバ。 8. 請求項1の無線トランシーバにおいて、第2の送信周波数帯域は第1の受 信周波数帯域から2MHz又はこれより少なく分離されている、無線トランシー バ。 9. 請求項4の無線トランシーバにおいて、スイッチング回路は第1及び第2 の単極、単投スイッチを含み、それにより当該無線機が第2の動作モードにある 時は、第1及び第2のスイッチはアンテナ及び受信機をデユープレクサへ夫々接 続し、また第1の動作モードにある時は、第1及び第2のスイッチはアンテナを デユープレクサをバイパスして受信機へ接続する、無線トランシーバ。 10.請求項9の無線機において、これらスイッチは電界効果トランジスタであ り、第1の動作モードにおいては、何時当該無線機が送信及び受信しているかに 対応するタイミング情報に従い制御される、無線トランシーバ。 11.セル式送信及び受信周波数帯域で送受信するセル式無線機を、当該セル式 送信及び受信周波数帯域に接触する対応する陸上移動体無線(LMR)送信及び 受信周波数帯域において送受信するために1つのデユープレクサのみを使用して 適合させる方法。 12.請求項11の方法において、当該1つのデユープレクサはセル式無線デユ ープレクサである、適合させる方法。 13.請求項11の方法であって、そこにスイッチが当該1つのデユープレクサ へ、当該無線機のアンテナへ及び当該無線機の送信機及び受信機へ接続され、前 記方法は更に、 当該無線機がセル式周波数帯域において送受信している時、当該デユープレク サをアンテナと送信機と受信機との間に接続するため当該スイッチをセットし、 当該無線機がLMR周波数帯域において送受信している時、アンテナと受信機 とを接続するに際し当該デユープレクサをバイパスするため当該スイッチをセッ トすることを含む、適合させる方法。 14.第1及び第2の動作モードにおいて、第1及び第2の組の周波数帯域で夫 夫情報を送受信するため無線トランシーバを動作させる方法であって、各組の周 波数は送信周波数帯域及び受信周波数帯域を含み、前記無線トランシーバは、送 信機、受信機、アンテナ、及びアンテナ、送信機、及び受信機に接続される唯1 つのデユープレクサを含み、前記方法は、 (a)無線トランシーバの動作モードを検出し、 (b)第1の動作モードにおいて、第1の構成において当該デユープレクサを アンテナ、送信機、及び受信機に接続し、そこに第1の組の周波数における信号 は当該1つのデユープレクサを使用して送受信され、 (c)第2の動作モードにおいて、制御信号に従い選択的にアンテナを当該デ ユープレクサを通して送信機へまた当該デユープレクサをバイパスして受信機へ 接続する、無線トランシーバを動作させる方法。 15.請求項14の方法であって、そこに当該無線トランシーバは時分割多元接 続(TDMA)通信方式に従って動作し、各周波数はフレーム当たり複数のタイ ムスロットを運び、フレームにおける各タイムスロットは一つの別個のチャネル に対応し、前記方法は更に、 タイムスロットアラインメントタイミング信号に基づいて制御信号を発生し、 これにより第2の動作モードにおいて、アンテナは、送信タイムスロットの間、 当該デユープレクサを通り送信機に接続され、またアンテナは、受信タイムスロ ットの間、当該1つのデユープレクサをバイパスして受信機に接続される、無線 トランシーバを動作させる方法。 16.請求項15の方法であって、そこに送信タイムスロットの間、アンテナと 受信機の間の接続は不能にされる、無線トランシーバを動作させる方法。 17.第1及び第2の動作モードにおいて、セル式及び陸上移動体無線の複数組 の周波数において夫々情報を送受信する能力を持つセル式無線トランシーバであ って、各組の周波数は送信周波数帯域及び受信周波数帯域を含み、前記セル式無 線トランシーバは、 送信機と、 受信機と、 アンテナと アンテナ、送信機、及び受信機に接続される唯1つデユープレクサと、 第1及び第2の異なる構成において、当該デユープレクサをアンテナ、送信機 、及び受信機へ選択的に接続するスイッチ回路と、 コントローラであって、このコントローラは、この無線機がセル式動作モード において動作している時は、第1の構成において、デユープレクサをアンテナ、 送信機、及び受信機に接続するためにスイッチング回路を制御し、そこに送信及 び受信される信号は当該1つのデユープレクサを通り経路決めされ、また無線機 がLMR動作モードにおいて動作している時は、第2の構成において、デユープ レクサをアンテナ、送信機、及び受信機に接続するためにスイッチング回路を制 御し、そこではしかし受信された信号はアンテナから当該1つのデユープレクサ をバイパスして受信機へ接続される、コントローラとを包含するセル式無線トラ ンシーバ。 18.請求項17のセル式無線トランシーバにおいて、送信される信号は、第1 及び第2の構成の両方において、デユープレクサを通りアンテナへ経路決めされ る、セル式無線トランシーバ。 19.請求項17のセル式無線トランシーバにおいて、スイッチ回路はGaAs FETスイッチを含む、セル式無線トランシーバ。 20.請求項17のセル式無線トランシーバにおいて、当該セル式無線機は、デ イジタルタイムスロット動作モードを含み、コントローラは、受信及び送信タイ ムスロット制御シグナリングに従いスイッチング回路を切替える、セル式無線ト ランシーバ。 21.送信機、受信機、アンテナ、及びアンテナ、送信機、及び受信機に接続さ れるデユープレクサを含み、セル式周波数において情報を送受信するセル式無線 トランシーバのために、陸上移動体無線(LMR)周波数において更に送受信す るためセル式無線トランシーバを修正する方法であって、前記方法は、 第1及び第2の異なる構成において、デユープレクサをアンテナ、送信機、及 び受信機に選択的に接続するスイッチ回路を付加し、 セル式周波数における通信のため、第1の構成において、デユープレクサをア ンテナ、送信機、及び受信機に接続するためスイッチング回路を動作させ、そこ に送信及び受信される信号は当該デユープレクサを通して経路決めされ、 LMR周波数における通信のため、第2の構成において、デユープレクサをア ンテナ、送信機、及び受信機に接続するためスイッチング回路を動作させ、そこ に受信される信号はアンテナから当該1つデユープレクサをバイパスして受信機 へ経路決めされる、セル式無線トランシーバを修正する方法。 22.請求項21のセル式無線トランシーバにおいて、送信される信号は、第1及 び第2の構成の両方において、デユープレクサを通りアンテナへ経路決めされる 、セル式無線トランシーバを修正する方法。
2 paragraphs, as filed
Description: TECHNICAL FIELD [Detailed description of the invention]
Achieve extended wireless coverage and additional capacity using extended frequency bands System and method to make Related application This application was filed on March 27, 1996 for the "downbanded cell formula". "Methods and devices for locating digital control channels in systems" US Patent Application Sequence No. 08/6 to T. Purzeromiik and K. Wraith "DBC and SE" related to No. 22,403 and filed on March 27, 1996 "Control channel synchronization with the network" entitled "T. Purzeromiik and T. Bu" Related to US Patent Application Sequence No. 08 / 622,631 to Laun, and 19 "Downbanded Cellular Systems and Methods" filed on March 27, 1996 US Patent Application to Thomas A. Purzeromiik, No. 08/62 Related to Nos. 2,311. Disclosure of these related applications is clarified here. Incorporate. Field of invention The present invention relates generally to wireless communication systems, and more specifically to existing communication systems. Regarding the increase in capacity and / or notification area. In one application, the present invention Extended Radio Transceiver Frequency Band Coverage in Adjacent Frequency Bands Regarding time / frequency duplication technology to achieve. Background and abstract of the invention The rapid development of wireless communication systems such as cell radios has reduced communication quality to designers. It is compelling to find a way to increase system capacity without letting it go. increase One way to provide that capacity is, for example, from analog to digital communication technology. Modifications increase the efficiency with which the available cell spectrum is used. That is. In North America, this change is from the analog "AMPS" method, I Digital method "S-54B and later standardized as IS-136" It was implemented by moving to "D-AMPS". Instead of frequency division multiple access Other technical improvements, such as the implementation of time-division multiple access, also increase system capacity. Ta. For cell communication systems, even with more spectrally efficient technologies The demand for larger capacities in the area remains a concern. Another way to increase the capacity of a cell-based communication system has an additional spectrum Is Rukoto. For example, the FCC was originally 2 for cell-based services in the United States. Frequency of one block (ie 825-845MHz (uplink) and 87 0-890MHz (downlink)) was assigned. In 1987, FCC, capacity An additional 5MHz was assigned to each frequency block to increase. Of course, this solution The strategy is limited, but it is because this available frequency spectrum is finite Also, existing communication systems other than cell type have this available frequency spectrum. This is because it already occupies the part. Frequency blocks for land mobile radio (LMR) systems, ie 806-82 4MHz (uplink) and 851-869 (downlink)) are assigned, These are in contact with those in the cell band as shown in FIG. Cell wireless system In contrast, the LMR system is between individual radio units in one special organization. Transmission relay (transmi) commonly used to provide wireless communication services ssion trunked) system. For example, the Ministry of Police patrols A variant of LMR (usually a public service) to communicate between the car and the police dispatcher Use a relay (PST) system). LMR system is historic Covers a relatively large geographic area and by one (or a few) transmitting base stations It has been implemented as an independent site to be serviced. Cellular cis Tem, on the other hand, covers a larger geographical area divided into many smaller "cells". -And each of the cells is serviced by its own transmitting base station. More recently , To extend geographic coverage at the LMR activity site (arena) The Lucitet system has been developed and implemented. At each LMR site The LMR operator is assigned a portion of the LMR spectrum and this LMR spectrum Fixed frequency pairs are typically used as control channels within parts of the torr. Selected for, while all other frequencies are used for traffic. In 1994, FCC introduced LMR, cell-based, and personal communication systems (PCS). ) Announced that the frequency spectrum allocated for will be uniformly regulated did. Operators therefore want what frequencies within the combined bandwidth now It can also be used by the method of doing. For example, the LMR spectrum is wide rather than site-by-site Combined with other regulatory changes that allow region-based licensing, The LMR frequency can now be used for cell communication. LMR frequency for cell communication The use of the spectrum here is "downbanded" It is called "Ru-shiki (DBC)". First mentioned some challenges to implement a DBC method compatible with the cell method There must be. For example, the traditional LMR method operating in the United States is 25 A cell that has a channel width of Khz but operates according to IS-54B. The equation has a channel width of 30 KHz. One answer to this question is above U.S. Patent Application Sequence Number No. 1 entitled "Downband Cell Systems and Methods" Given in 08 / 622,311 where of the conventional LMR spectrum Channel settings are redefined in a way that gives significant benefits. More specifically , 5 new for every 6 originally identified 25KHz LMR channels A new 30KHz DBC channel is identified. In this way, complete with the cell method Achieved compatibility, eg allowing roaming between cells and DBC methods Is done. As can be seen from Figure 1, the maximum cell transmission frequency (849MHz) and the minimum LMR reception There is only a 2MHz gap with the communication frequency (851MHz). This small frequency A few gaps are the maximum transmission of 20MHz commonly used in DAMPS cell phones. / Symmetrical to the minimum reception frequency gap. The interval given by this 20MHz gap is Used in cell radios to maintain isolation between transmit and receive signals Goodly given by the ramic duplex filter. But the current filter material The technology (including ceramic duplexer) is the narrow 2MHz shown in Figure 1. A single-LMR that provides ideal in-band "flatness" and out-of-band rejection for gaps Enables the manufacture of "plus" cell-type ceramic duplexer filters You can't. Therefore, frequency band coverage into the traditionally separated communication frequency band It is an object of the present invention to provide a duplexer capable of increasing the number of Conventionally, since transmission and reception are performed in exactly one frequency band, for example, cell radio. Use existing transceiver hardware in the radio It is a further object of the present invention to provide such a duplexer. Uses only a single duplexer in extended band wireless transceivers It is a further object of the present invention. The number of components or the size of components can be reduced to a radio with such an extended band at low cost. It is a further object of the present invention to manufacture without increasing the amount. A further object of the present invention is compatible with the IS-136 specification for cell phones. The dual circuit of the cell type radio is adapted, and it also smells in the land mobile radio frequency band. In addition to enable "downbanded" communication. The present invention is capable of transmitting and receiving information at the first and second different sets of frequencies. Provides a wireless transceiver. The frequencies of each set are the transmission frequency band and reception frequency. Includes wavenumber band. An example of the first and second set of frequencies is for a land mobile cell radio. Send / receive allocation for. Wireless transceivers include transmitters, receivers, and Ann Including tena. A duplex circuit is connected between the antenna, transmitter and receiver. 1st Operation of the radio transceiver for communication at either the second set of frequencies Various antennas, duplexer circuits, receivers, and transmitters depending on the mode Multiple switches are provided to configure the system. In an embodiment as one preferred example of the present invention, the circumference of the first and second sets Only a single duplexer that allows radio transmission and reception in both wavenumbers Used. Multiple switches extend this one duplexer to the radio's antenna And connect to the receiver and transmitter. Operates in the first set of transmit / receive frequency bands Therefore, multiple switches use this duplexer as both an antenna, a receiver and a transmitter. Set to connect between the two. In the other pair of transmit / receive frequency bands To work, multiple switches put the antenna and receiver at least in the receive path It is set to bypass the duplexer when connecting. Therefore, the present invention is originally in a formally designated cell-type transmission and reception frequency band. On land where the cell-type radio that transmits and receives is in contact with the cell-type transmission and reception frequency bands. Single for transmission and reception in mobile radio (LMR) transmit and receive frequency bands Can be used to fit using only the Cellular Duplexer of. Cellular frequency The transmission and reception of numbers are routinely routed via a duplexer. LMR Frequency transmission may be routed via a duplexer, while LMR reception The route is determined via multiple switches. One example for a time slot based communication system, eg a TDMA system In the application as, the control of the switch in the extended frequency band is tie. Achieved by the use of control signals generated based on the Muslot adjustment timing .. When transmitting and receiving in the cell frequency band, the switch is statically set. L In the MR extended band, the switch is set dynamically. Radio sends When doing so, the antenna transmits via the duplexer during the transmit time slot. Connected to the machine. During the transmit time slot, the switch effectively receives and receives the antenna. Isolate the quarantine. During the receive time slot, the antenna is in the one dup Bypassing the lexa and connecting to the receiver. In a preferred embodiment, the switch has low insertion loss and rapid switching speed. Using gallium arsenide (GaAs) field effect transistors (FETs) with Will be implemented. These switches are special because of the otherwise extended frequency band. Isolation between necessary transmissions and receptions provided by a second duplexer included separately To maintain. Therefore, the present invention has been improved in congested areas as well as geographical coverage. Providing a radio with system access (given in the extended frequency band) (Due to additional channels), and this also extends in one embodiment. With an expensive second duplexer to handle calls in the specified frequency band It is done without any addition. In addition, existing cells such as in conventional cell radiotelephones Lancy bar circuits can be adapted for extended frequency band communication .. A brief description of the drawing These and other objects of the invention, as well as examples as specific examples of the invention, are now attached. Explained with the accompanying drawings, similar reference numbers in the drawings indicate similar elements. Su. Figure 1 shows contact transmit and receive in the frequency range of 800 to 900 MHz. The graph which shows the land mobile radio and the cell type frequency band. Figures 2A and 2B show downbars used in combination with existing cell systems. Shows the concept of a cell-type system that has been installed. Figure 3 shows radio base stations assigned to a single cell and multiple mobile / portable radios. High level diagram of a single "cell". FIG. 4 essentially uses a set of frequencies according to an example example of the present invention. Radios designed to work with, communicate at additional, extended sets of frequencies Functional block diagram of a radio adapted to do. FIG. 5-8 shows the transmission and reception of the first set according to an embodiment as a second example of the present invention. A second set of adjacent mobile radiotelephones configured to communicate at the communication frequency A mobile radiotelephone machine adapted to transmit and receive at transmission and reception frequencies. Noh block diagram. FIG. 9 depends on the operating mode of the radio according to a second preferred embodiment of the present invention. Flow showing an example of the duplexer switching control method by the radio controller Figure. Figures 10 (A) to 10 (D) show the ties generated in the TDMA cell type system. Switching RF switches according to the present invention using Muslot tuning signaling The technology is shown as an example for generating a switch control signal for switching. Iming diagram. FIG. 11A is a schematic view of an RF switch as an example that can be used according to the present invention. FIG. 11B is a table showing the characteristics of the RF switch shown in FIG. 11A. Detailed description of the invention In the following description, a sufficient understanding of the present invention is given for the purpose of explanation, not limitation. Therefore, specific details such as special circuits, circuit components, techniques, etc. are described. However, for those skilled in the art, the present invention deviates from this particular detail in other embodiments. It is clear that it can be done at. In other cases, the well-known method, device The detailed description of the circuit and circuit should not obscure the description of the present invention due to unnecessary details. I omitted it. Throughout this description, downbanded cell applications as an example of the present invention. Often refers to applications to cell radios, where cell radios are cell and LM. It has been modified to transmit and receive in both R frequency bands. Those skilled in the art, this is As an example application only, the present invention provides extended coverage and / or extra. There is a frequency band that is appropriately close or in contact with the communication system in order to provide a sufficient capacity. You will of course understand that it can be applied to any existing communication system. Furthermore , Cell type and LMR transmission / reception frequency bands are in contact, but the present invention always It can also be applied to cover adjacent frequency bands that are not in contact with each other. The downbanded cell system is both standalone DBC systems Includes, which utilizes the LMR spectrum and enhances communication services as well as DB It also provides collaborative applications of C-systems and cell-based systems. Figure 2A shows the DBC system One such collaborative application of the system, where the DBC system is a cell-based system. Located adjacent to the system. DBC system shown as having multiple cells Each of these is typically used in existing cell wireless systems. Assisted by the Mobile Exchange Center (MSC) 10. Similarly, this cell system Has multiple cells supported by three such MSs 12, 14, and 16 Have. Each geographical "cell" (shown as a circle or ellipse) sends a radio signal within the cell. Contact each MSC to send to a mobile / portable radio and receive a radio signal from it Includes one or more fixed radio base stations (not shown) that follow. Structure of this example In the process, the DBC system provides additional geographic coverage, thereby giving an example. For example, if the operator of the cell system is a mobile / mobile wireless subscriber, the DBC system If you "roam" into one cell in the system, move / carry it It will be possible to provide greater geographic services to wireless subscribers U. Another collaborative example is shown in Figure 2B, where each large circle and ellipse is one set. The small circle in the cell system 20 represents one DBC system. Represents a system. In this example, multiple DBC systems match one cell system, In the capacity of a cell system, i.e. used to supplement the processing of more simultaneous cells Show the case where it can be done. These examples of DBC system applications have been described at the single cell level, but this Some general details of radio base stations and mobile / mobile radio stations to inflate the debate However, it does not give details of unnecessary amounts that may obscure the present invention. DBC radio base stations and mobile / mobile radio stations are conventional cell-type base stations and mobile / mobile radios. It can be manufactured using essentially the same components as the station, with a few exceptions. For example, DBC equipment requires radio frequencies to operate in the LMR frequency band. Includes radio frequency (RF) communication hardware (and software). Moving as an example and More specific details regarding base station implementation were pending together and transferred in common. P. Den, filed October 27, 1992, entitled "Multimode Signal Processing" US Patent Application Sequence No. 07 / 967,027 to G and B. Eklund , The disclosure is cited and incorporated here. DBC system is also EIA / TL Implemented according to D-AMPS as specified in AIS-54B and IS-136 Come on, this is also quoted and incorporated here. Figure 3 shows one that can be used in a downband cell wireless communication system. It is a block diagram of the cell of. This cell 30 is an example radio station within cell 30. Shows station 32 and multiple mobile / mobile (M / P) transceivers 38. Radio base station 3 2 includes a data processor 34 connected to a mobile exchange center (MSC) and is mobile The Exchange Center (MSC) is then the Public Switched Telephone Network (PSTN) and possibly other networks. Connected to the network (not shown). The radio base station 32 for cell 30 is paired controlled by the data processor 34. Multiple processed by the corresponding voice channel transceiver (36b ... 36n) Includes audio channels. Also, the radio base station 32 has more than one control channel. Includes a control channel transceiver 36a capable of processing. Control channel tiger The sensor 36a is also controlled by the data processor 34. In general, control The channel transceiver 36a tunes the mobile / mobile 38 to the control channel (live). Dynamic call is conducted via one of the voice or data channel transceivers Controls information through the control channel of the base station or cell (if not). Voice cha Nell transceivers are traffic channels that can carry voice and data information. Process. When the mobile / portable radio 38 first goes into idle mode, it DBC control to get overhead control information and listen to the page Check the position of the channel and synchronize with it. Check the location of the DBC control channel An example technology is "DBC system in downbanded cell system". The United States incorporated under the title "Methods and Devices for Positioning Your Channel" It is described in the patent application. Advantageously, the center frequency for the DBC channel is the existing cell system. It can be specified to maximize compatibility with the system. For example, this central frequency The number allows the same oscillator to be used in DBC equipment to minimize equipment costs Based on the known tuning of frequency synthesis oscillators typically used in cell-type equipment. You can select next. This means that DBC equipment can transmit through many frequency bands. When operating, for example in more than one of the LMR, cell, and PCS frequency bands Especially valuable when you can make it. As mentioned above, between the land mobile radio (LMR) and the cellular frequency band--the seam Without and compatible--a cell transceiver with the ability to deliver and roam One of the most significant hardware challenges we offer is especially when it comes to filtering. Double filtering. For the purpose of this explanation, Duplexa has 2 channels A filter that acts as a multiplexer, a 2-channel multiplexer Use a transmit / receive switch so that one antenna can be used for both reception and transmission .. More specifically, the maximum cell transmission frequency of 849MHz and the minimum of 851MHz. There is only a 2MHz gap with the land mobile radio reception frequency. Existing Phil Materials such as current ceramic double filters are cell type and LMR transmit and receive. Provides in-band flatness and out-of-band rejection that exist simultaneously for both the signal frequency band Not to mention that it does not come, nor can it provide the necessary isolation between the transmit and receive bands. Figure 4 shows an example of a mobile / portable wireless transceiver hardware configuration. Extension from one set of transmit / receive (tx / rx) frequencies to two sets of tx / rx frequencies Provides high frequency coverage, such as LMR / cell coverage. Move / carry The band radio transceiver 38 receives and transmits the radio, which is commonly shown in FIG. Includes a single antenna 48 connected to the communication path. The duplex circuit 40 is the first set of First for duplicating transmit / receive frequencies (such as land mobile radio band frequencies) Duplexer 42 and the second set of transmit / receive frequencies (like cell frequency bands) RF switch 46 connected to a second duplexer for duplication Including. The signal received from the RF switch 50 is the amplifier 52 (which is preferably It is coupled to a low noise amplifier) and its output is due to the first set by the RF switch 54. To the band filter 56 that passes through the reception frequency band of, and the reception corresponding to the second set It is routed to a band filter 58 that passes through the frequency band. RF switch 60 Downconverts the output from the received filter and signal processor circuit Combined to 62, the latter is a base van used to drive speakers, etc., for example. Output signal is generated. The transmitter processes the signal to be transmitted and converts it into an RF signal. Includes Rossessa and Upconverter 66. The RF signal to be transmitted is RF Bandwidth received by switch 68 and passed through the frequency band of the first set of frequencies Bandwidth for the transmission frequency band to the filter 70 and for the second set of frequencies Routed to Ruta 72. Filtered output goes through RF switch 74 Is passed to the power amplifier 76. The power amplifier output is directly routed to the duplex circuit 40. You may try it. However, the circulator 78 has a stable fixed impedance. Buffer the power amplifier 76 out of giving and protect it from reflected antenna waves Therefore, you may prepare at will. RF switch 80 is the first and second duplexer Route the amplified RF signal to both 42 and 44 and these duplexers Sends signals via RF switch 46 at their respective transmission frequencies Pass through antenna 48 in the band. Downconverter / Signal Processor 60 and Signal Processor / Upconverter The control signal for controlling the data 66 is given by the controller 64 and is controlled. -La 64 is a properly programmed microprocessor and / or digital communication Can include a No. processor. Controller 64 is also a transceiver and RF switches 46, 50, 54, 60, 68, 74 outside the duplexer circuit, And 80 are given additional control signals to control. Especially, the controller is electric Appropriate for starting or stopping the power amplifier, and various RF switches Switching and power amplifier control signals for control according to appropriate timing control signals Generate a number. Depending on the operating mode of radio 38--at the first set of tx / rx frequencies? Either at the second set of tx / rx frequencies, switches 46, 50, and 8 0 is the first Duplexer 42 or the second Duplexer depending on the controller 64 Set to combine with any of 44. These switches are quasi-static , Where these are transceivers 38 in the first set of tx / rx frequencies Changes only when passing from operation to the second set of tx / rx frequencies (or vice versa) To. In essence, in the first example example according to FIG. 4, the antenna and the transmitter The interface between the machine / receiver path is from two radios in one radio Includes redundant hardware. Appropriate software for switching and transit Variable to control the bar to tune to frequencies in both the first and set bands Assuming further, this radio is seamlessly compatible with cell and land Has the ability to roam into two different frequency bands, such as the mobile radio frequency band ing. Unfortunately, the extended band radio according to the first embodiment has this extended circumference. Wavenumber bandwidth is achieved in terms of cost increase, magnitude, and power loss. DEW Plexers are particularly expensive components and are fairly large and have a variety of radio trances. Considerable "real estate" on printed distribution frames equipped with ba and signal processing hardware Occupy the quantity. The increase in cost is clearly undesirable. Pole in mobile phones Since the most important factor is the small size, it is not desirable to increase the size. Added Another drawback of the Duplexer is that it is 1.0-1.5 in the transmit path. Because it contributes to dB loss and 2.5-3.0 dB loss in the receive path. is there. Both of these losses reduce output power and sensitivity, and therefore of the radio. Reduces the effective range of motion. Disadvantages of the First Example and Overcoming The Second Preferred Example of the Invention Now Figure 5-8 Explain with. In the second embodiment of the present invention, a frequency division duplexer 40 was replaced by hybrid time / frequency division multiplexing circuit 82. To the advantage , This hybrid time / frequency division multiplexing circuit 82 is duplicated in the example of FIG. Includes only one dueplexer (rather than two) corresponding to Lexa 44. DEW Even without the Plexa 42, the hybrid time / frequency division multiplexing circuit 82 is: By dynamically switching the RF switches 46 and 50 as described in It provides the ability to transmit and receive radio waves through both the first and second frequency bands. Many of the circuits in transceiver 38 are the same as those already mentioned with Figure 4 above. (Similar reference numbers refer to similar elements). Therefore, the description in Figure 5-8 is Focus on the operation of hybrid time / frequency division multiplexing circuit 82. Generally, con The troller 64 has an RF switch 46 and an RF switch 46 based on the operating mode of transceiver 38. And 50 states are controlled. If this radio depends on the second set of transmit / receive frequencies When operating to send and receive, controller 64, RF switch 46 and Set 50 to a relatively static state, which causes antenna 48 to duplicate. Connect to both the receiver and transmitter via the 44. In this mode of operation Duplexer 44 switches transmit and receive signals to / from antenna 48. Acts as a traditional duplexer, on the other hand the proper spacing between transmit and receive signals Keep away. This radio is operating to transmit and receive according to the first set of transmit / receive frequencies. Then, RF switches 46 and 50 are dynamically moved by controller 64 at just the right time. Operate. In this mode of operation, the duplex circuit 82 is in both time and frequency. To connect the signals transmitted and received depending on the antenna 48 between the receiver and the transmitter. Switch. When this radio 38 is transmitting, the RF switch 46 has a transmission signal. Antenna so that it passes through Duplexer 44 and Switch 46 to Antenna 48. Switched to connect 48 to Duplexer 44. To Duplexa 44 The transmission filter in the first and second frequency bands is, for example, a low frequency filter. It has a wide enough passband to pass the transmission frequency for both. This generation Instead, for the received signal, switches 46 and 50 depend on controller 64. Acts to bypass the Duplexer 44 and is received on the antenna 48 The signal is directly coupled to the receiver. In Figure 6, the radio transceiver 38 sends a signal in the second set of transmit and receive bands. Switch configuration and signal parameters controlled by controller 64 during transmission and reception Indicates If the radio 38 is a cell-type radio from the beginning or originally, DEW Plexa 44 is designed to duplicate transmit / receive frequencies in the cellular band Corresponds to the cell-type duplexer. In that case, the second set of transmit / receive frequencies The number will correspond to the cell frequency band. Control in cell-type band communication La 64 makes switches 46 and 50 relatively static (in time) as shown in Figure 6. To connect the antenna 48 to the duplexer 44 via a fully redundant connection Set to, the transmitter output signal is directly coupled to the Duplexer 44, Anne The signal received on the tena 48 passes through switch 50 by the duplexer 44 and is absent. The route is set to the line receiver. Figures 7 and 8 show that the wireless transceiver 38 has a cell-type tx in an example application. The first tx corresponding to the LMR tx / rx frequency band that touches the / rx frequency band Hybrid time / frequency division multiplexing when operating in the / rx frequency band The switch configuration and signal path of circuit 82 (thickly shown in the figure) are shown. Figure 7 is special To send the signal from the transmitter using the duplexer 44 and switch 46 The switch configuration for this is shown. Of note in Figure 7, the receive path is switch 4. To be isolated from the signals transmitted by 6 and 50. The signal is the first reception band When received in the region, Figure 8 shows that these switches are matched by controller 64. Dynamically toggled to the opposite position at the right time to bypass the Duplexa 44 Indicates that the signal from the internetr 48 is routed directly to the receiver. The operation mode of the wireless transceiver 38 is changed to a switch / button by the operator. Can be set more. Instead, the wireless transceiver 38, for example, Detected signal strength / quality signal or control signal from radio base station, eg delivery ( Automatically change the operation mode using a signal such as hand-over) Can be done. Figure 9 shows the controller 64 to control the operation of switches 46 and 50. It is a flow chart which shows the general outline of the movement performed. Switch 54, 60, And 74 are also controlled by the controller 64, but the switch control is mainly Control of switches 46 and 50 is a problem. Therefore, the controller is a dual Enter the Xa switching routine 100 and set the operating mode of the wireless transceiver 35. Proceed to decision block 102 to decide. If the radio is in the cell band (only one case) If it works, the controller determines the format of the cell-based system (bro CK 104). Most digital cell radios are old analog cell systems And analog or day to adapt to the communication of newer digital cell systems Because it works in either digital mode. If the cell system is analog If so, controller 64 routes communication through a single duplexer 44. And start radio operation in Frequency Division Multiple Access (FDMA) mode Set the RF switch to. If the system format is digital time slot In the system used, controller 64 has a single dew for transmit and receive signals. Routed through Plexa 44 and time-division multiple access (TDMA) for radio operation Set the RF switch to start in mode. If the radio is in the land mobile radio (LMR) frequency band (in this non-limiting example) If it is operating in), the controller 64 sends and receives RF switches. Start hybrid time / frequency multiplexing by toggle to Muslot To. As is well known in the technology, time division multiple access (TDMA) systems are multi-use. Multiple channels are multiplexed on a single frequency, and each channel is paired with one time slot. I am responding. Multiple time slots are grouped together in multiple frames Each frame carries, for example, two or three time slot-style channels. I'm sorry. Transmission and reception time slots between mobile / portable radios and fixed base stations Slot alignment and synchronization between IS-54 and IS-136 standards It is described in detail. Control slot alignment and slot synchronization Therefore, the timing signal generated by the base station is determined according to the present invention. It can be easily adopted by the controller 64 to adjust the hatching operation. To. Timing control used to perform dueplexer switching Signals are described in terms of time division multiple access systems, but the present invention What is the right timing signal to the controller, not limited to the time slot environment? As long as it tells you if you should take proper control of the hour switches 46 and 50, It can also be applied to other types of communication systems, including log systems. One timing signal existing in IS-136 is transmitted by controller 64. It is given to the power amplifier 76, especially the power amplifier drain voltage. Figure 10 ( A) is full rate (full) including 6 time slots (TSI-TS6) rate) Indicates a TDMA frame. These 6 time slots are common In the meantime, the radio receives information (no transmission) reception (Rx) time Radio transmits information (not received) in slot or in between transmission (Tx) ) Configured as a time slot. One special of receive and send time slots The allocation of is in accordance with IS-136 (Revision 0) dated May 17, 1995, Figure 10 (B). ). Time slots 1, 3, 4, and 6 are reserved for reception. Im slots 2 and 5 are reserved for transmission. Therefore, it is shown in FIG. 10 (C). As such, the transmitter power amplifier drain voltage is only during time slots 2 and 5. "On" (appropriate voltage level to turn on the power amplifier transistor To). Therefore, controller 64 also controls the duplexer switch. Then, these switches are suitable for the appropriate time slot as shown in Fig. 10 (D). Switch to the proper reception and transmission state. In this way, the master timing signal from the radio base station is the transmission time slot. Turns on the inter-power amplifier and turns off during the receive time slot (battery power) Used to apply an appropriate drain voltage to the power amplifier 76 (to store power) Used. This same timing signal is sent by controller 64 to RF switch 4 It may be used to control the switching state between 6 and 50. LMR transmission time slot During the operation, the transmitter path connected to the Duplexer 44 and the receiver are switched. Quarantine / inoperable by proper switch setting of Chi 46 and 50. L For MR receive time slots, these switches switch the Duplexer 44. It is set in their opposite position setting to pass. Of course, the present invention includes both analog and digital and other non-time slot systems. It can be easily applied to the system. All you need is that the RF switch is suitable for them Smell in a special frequency band where the transceiver is located so that it can be set to a normal state It is to appropriately instruct the controller whether to send or receive. In a preferred embodiment of the invention, the RF switch is gallium arsenide (GaA). s) Field Effect Transistor (FET) Microwave Monolithic Integrated Circuit (MMI) Cs) may be used. As an example, FIG. 11A shows a commercially available product, for example, Alpha Industry Co., Ltd. (Al). Gallium arsenide FET switch from pha Industries, Inc.) Shows 150. Input terminal (I / P), drain voltage input terminal (V)<sub>DD</sub>) Both are F Connected to ETs 152 and 154. Control voltage V<sub>1</sub>And V<sub>2</sub>But switch output O / P<sub>1</sub>And O / P<sub>2</sub>Through a bias resistor to drive the FETs 152 and 154 It is applied to the In essence, the switch 150 is a single pole, single throw switch. The advantages of using the GaAs FET switch 150 are low insertion loss and extremely fast speed. Itching speed and simple control are included. In particular, each GaAs FET 150 It has an insertion loss on the order of 0.5 dB and has an MMIC switching speed of 10 nanoseconds. It is an order. These advantages include the extremely small size of the switch and its high linearity. Combined and synchronized with the transmit / receive mode of the wireless transceiver Controller 64 It is useful for excellent switches that are easily controlled using control signals from. Up As described above, this control signal is a transmit synchronous drain buy applied to the power amplifier 76. It can be taken out from the ass voltage, and this drain bias voltage is the transceiver. Is at a high or zero voltage level when transmitting and at the end of the time slot Is a low or zero voltage level. Figure 10B shows FET switches 152 and 15 Output O / P in addition to the insertion loss given by 4<sub>1</sub>And O / P<sub>2</sub>Simplify the relationship between quarantine Shown in a simple chart format. Thus, the present invention has been described in terms of examples. In general, the present invention In the adjacent or contacting frequency band essentially without the need for additional hardware Mobile / non-mobile by providing or adapting mobile / portable radios that can communicate with Favorably increase the capacity and coverage of line communication systems. LMR and center to contact In the example of the frequency, the cell radio has the ability to communicate in the LMR frequency band as well. Only a few modifications are needed to the hardware and software of the radio to give Not. The second embodiment of the present invention is based on the result of using only one duplexer. And it is preferable because of its lower cost and smaller size. Two RF switches One for each pair of adjacent frequency bands by actively switching The need for a duplexer is eliminated. Two switches in the LMR path The use keeps the transmission and reception isolation, and both the cell type and the LMR transmission signal are set. Transmission low frequency fill for both frequency bands as it passes through the le-type duplexer Taservice reduces the spurious content of the wave control to receptive levels. In addition, M The third order intermodulation performance of the MIC switch is high enough that both transmissions and And the reception distortion drive requirement is maintained. The examples described above are examples in all aspects of the invention, rather than restrictive. Intended to be demonstrative. Examples as the above examples are for bases and mobile stations. As described above, the present invention can be applied to any wireless communication system. For example , Satellites, DBC remote devices including mobile units, personal digital aids, etc. Data will be able to be transmitted and received in communication with. Furthermore, although the present invention has mainly described communication within the LMR spectrum, the present invention Ming is a multiple hyperband, for example dual mode DBC It is also intended to be used in cell-type band mobile phones. For example, move The station can be implemented to operate in the A-side cell band and part of the LMR band. .. This DBC mobile station provides a national roaming footprint for DBC network operators It has the advantage of being able to use existing cell nets that allow it to be used. Multiple hyperbar Commonly transferred to readers interested in aspects of the system capable of Filed April 19, 995, entitled "Multiple Hyperband Mobile and Base Stations" See U.S. Patent Application Sequence No. 08 / 425,051 to Crysta Wraith However, this disclosure is cited and incorporated herein. As described above, the present invention can be applied in detail. Many modifications are possible, and this modification can be made by one of ordinary skill in the art from the description contained herein. Can be pulled out. All such modifications and modifications are subject to the following claims. It is believed to be within the scope and spirit of the invention as defined.
Every citation, both ways
| Document | Relation | Office | Cited during |
|---|---|---|---|
| US8879499B2 | Cited by | United States of America | Applicant |
| WO2011068061A1 | Cited by | World Intellectual Property Organization (WIPO) | Applicant |
| WO2011068063A1 | Cited by | World Intellectual Property Organization (WIPO) | Applicant |
| US8768410B2 | Cited by | United States of America | Applicant |
9 members in 8 offices
Priority claims9
| Document | Office | Kind | Date |
|---|---|---|---|
| 08703631 | United States of America | – | |
| 70363196 | United States of America | A | |
| 70363196 | United States of America | A | |
| 9715274 | United States of America | W | |
| 9715274 | United States of America | W | |
| 703631 | – | – | – |
| PCTUS199715274 | – | – | – |
| US19960703631 | – | – | – |
| WO1997US15274 | – | – | – |
Members9
| Document | Office | Kind | |
|---|---|---|---|
| CA2264633A1 | Canada | A1 | |
| WO9809382A1 | World Intellectual Property Organization (WIPO) | A1 | |
| AU4734297A | Australia | A | |
| US5915212A | United States of America | A | |
| BR9711256A | Brazil | A | |
| BR9711256A | Brazil | A | |
| CN1234148A | China | A | |
| KR20000035890A | Republic of Korea | A | |
| JP2000517496AThis record | Japan | A |
Numbers
- Publication
- 2000-517496
- Publication, DOCDB
- 2000517496
- Publication, EPODOC
- JP2000517496
- Application
- 10511977
- Application, DOCDB
- 51197798
- Application, EPODOC
- JP19980511977
Titles2
- Japanese
- 【発明の名称】拡張された周波数帯域を使用して拡張された無線カバレージ及び追加の容量を達成するシステム及び方法
- English
- INDUSTRIAL APPLICABILITY Systems and methods for achieving extended radio coverage and additional capacity using extended frequency bands.
Classification
- CPC, 3
- H04B1/52
- H04W16/02
- H04W88/10
- IPC, 4
- H04B1 48
- H04B1 52
- H04W16 02
- H04W88 10