Position registration for cellular satellite communication systems.
Abstract
(57) [Summary] How to locate a mobile radiotelephone (120) in a satellite communication system. The mobile radiotelephone (120) scans a plurality of paging channels to measure the signal strength of the paging channels.

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Projected expiry passed 11 January 2015, 11.7 years ago.
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28 claims: 28 independent, 0 dependent
- 1【特許請求の範囲】 1.衛星通信システム内の移動無線電話の位置を決定する方法であって、 前記移動無線電話で複数のページングチャンネルを走査し、 前記ページングチャンネルの信号強度を測定し、 最も強い信号強度を持つページングチャンネルを選択し、 前記ページングチャンネルで放送され、かつ周囲のスポットビーム内のページ ングチャンネルの周波数を含む情報を復号し、 前記周囲のスポットビーム内のページングチャンネルの信号強度を測定し、 前記測定値を量子化して前記移動無線電話の近似の位置を決定する、 段階を含む方法。
- 2衛星通信システム内の移動無線電話の位置を決定する請求項1記載の方法 であって、 前記近似の位置をカバーする第1スポットビーム内のページングチャンネルを 用いて前記移動無線電話をページングする、 段階を更に含む方法。
- 3衛星通信システム内の移動無線電話の位置を決定する請求項2記載の方法 であって、前記システムは、前記第1スポットビームを囲むスポットビームのペ ージングチャンネルで前記移動無線電話をページングする、方法。
- 4衛星通信システム内の移動無線電話の位置を決定する請求項1記載の方法 であって、前記移動無線電話はトラヒックチャンネルの信号強度を測定する、方 法。
- 5衛星通信システム内の移動無線電話の位置を決定する請求項1記載の方法 であって、前記ページングチャンネルの信号強度を減法復調を用いて測定する、 方法。
- 6衛星通信システム内の移動無線電話の位置を決定する請求項1記載の方法 であって、 前記移動無線電話で前記測定された信号強度がどの時間スロットで増加しまた 減少するかを決定し、 前記測定された信号強度がどの時間スロットで増加しまた減少するかに基づい て、前記移動無線電話の近似の位置を計算する、 段階を更に含む方法。
- 7衛星通信システム内の移動無線電話を登録する方法であって、 前記移動無線電話で複数の衛星ページングチャンネルを走査し、 前記衛星ページングチャンネルの信号強度を測定し、 前記測定された信号強度を用いて前記移動無線電話の近似の絶対位置を計算し 、 前記移動無線電話により前記衛星通信システムにアクセスして登録を要求し、 前記衛星システムから前記登録の確認を受ける、 段階を含む方法。
- 8衛星通信システム内の移動無線電話を登録する請求項7記載の方法であっ て、 前記近似の絶対位置を前記移動無線電話に送信する、 段階を更に含む方法。
- 9衛星通信システム内の移動無線電話を登録する請求項7記載の方法であっ て、 前記確認に応答して前記測定された信号強度を前記衛星通信システムに送る、 段階を更に含む方法。
- 10衛星通信システム内の移動無線電話を登録する請求項7記載の方法であ って、前記移動無線電話は、前記確認を受けた後で、時間を合わせた休眠モード に入る、方法。
- 11衛星通信システム内の移動無線電話を登録する請求項7記載の方法であ って、前記近似の絶対位置が所定の量だけ変わらなかった場合は、前記移動無線 電話は、時間を合わせた休眠モードに入る、方法。
- 12衛星通信システム内の移動無線電話を再登録する方法であって、 前記移動無線電話で複数のページングチャンネルの信号強度を測定し、 前記測定された信号強度を用いて前記移動無線電話の絶対位置を計算し、 前記絶対位置がいつ所定の量だけ変わったかを決定し、 前記絶対位置が前記所定の量だけ変わった場合は前記システムに再登録する、 段階を含む方法。
- 13二重モード衛星/セルラ通信システムの一部である衛星通信システム内 の移動無線電話を登録する方法であって、 前記セルラ通信システム内の望ましい呼出しチャンネルを前記移動無線電話で 監視し、 前記望ましい呼出しチャンネルの質が所定のしきい値より下に落ちたと前記移 動無線電話が決定した場合は、呼出しチャンネルの別のリストを走査し、 前記別のリストの呼出しチャンネルのどれかの信号の質が前記所定のしきい値 より上かどうかを決定し、 どの呼出しチャンネルの信号の質も前記所定のしきい値より上でない場合は、 登録取消し信号を前記セルラ通信システムに送信し、 前記登録取消し信号を受けた後で、前記移動無線電話のセルラシステム内の最 新の既知の位置を前記衛星通信システムに送信し、 前記登録取消し信号を送った後で、前記移動無線電話をセルラモードから衛星 モードに切り替える、 段階を含む方法。
- 14移動無線電話を登録する請求項13記載の方法であって、別の呼出しチ ャンネルの前記リストは前記セルラ通信システムによって絶えず放送される、方 法。
- 15移動無線電話を登録する請求項13記載の方法であって、別の呼出しチ ャンネルの前記リストは登録の際に前記移動無線電話に送られる、方法。
- 16移動無線電話を登録する請求項13記載の方法であって、 前記移動無線電話で複数のセルラページングチャンネルを走査し、 前記ページングチャンネルの信号強度を測定し、 最も強い信号強度を持つページングチャンネルを選択し、 前記ページングチャンネルで放送され、かつ周囲のスポットビーム内のページ ングチャンネルの周波数を含む情報を復号し、 前記周囲のスポットビーム内のページングチャンネルの信号強度を測定し、 前記測定値を量子化して前記移動無線電話の近似の位置を決定する、 段階を更に含む方法。
- 17移動無線電話を登録する請求項13記載の方法であって、 前記セルラ通信システムからの呼出しチャンネルの信号の質が前記所定のしき い値より上であることを前記移動無線電話で検出し、 前記セルラ通信システムに再登録し、 第2登録取消し信号を前記セルラ通信システムから前記衛星通信信号に送信し て前記移動無線電話の登録を取り消す、 段階を更に含む方法。
- 18移動電話を登録する請求項17記載の方法であって、前記第2登録取消 し信号を陸上線によって前記衛星通信システムに送信する、方法。
- 19移動無線電話を登録する請求項13記載の方法であって、セルラ通信シ ステムが前記移動無線電話から前記登録取消し信号を受けた後で、前記セルラシ ステムは前記移動無線電話の位置を前記衛星通信システムとしてホーム位置記録 にリストする、方法。
- 20移動無線電話を登録する請求項17記載の方法であって、前記移動無線 電話が前記セルラ通信システムに再登録した後で、前記セルラシステムは前記移 動無線電話の位置をホーム位置記録にリストする、方法。
- 21移動無線電話を登録する請求項13記載の方法であって、前記衛星シス テムは前記移動無線電話の最新の既知の位置をホーム位置記録に通知する、方法 。
- 22移動無線電話を登録する請求項13記載の方法であって、前記セルラシ ステムは前記移動無線電話の最新の既知の位置をホーム位置記録に通知する、方 法。
- 23移動無線電話を登録する請求項22記載の方法であって、前記セルラシ ステムは前記移動無線電話の前記最新の既知の位置から訪問者位置記録識別を決 定し、次に前記訪問者位置登録識別を前記ホーム位置記録に送る、方法。
- 24移動無線電話を登録する請求項23記載の方法であって、前記セルラシ ステムは前記訪問者位置登録識別から衛星仮想訪問者位置登録識別を決定する、 方法。
- 25二重モード衛星/セルラ通信システム内で移動無線電話が衛星通信シス テムを聞いてセルラ呼出しチャンネルを見つけることを援助する方法であって、 各衛星ページングチャンネルの所定の地域についてのセルラ呼出しチャンネル 周波数のリストを放送し、 セルラ呼出しチャンネル周波数の前記リストを移動無線電話で受け、 前記セルラ呼出しチャンネルの信号強度を測定し、 前記セルラ呼出しチャンネルの1つの信号強度が所定のしきい値より上かどう かを前記移動無線電話で決定し、 前記セルラ呼出しチャンネルの1つが所定のしきい値より上であると前記移動 無線電話が決定した場合は前記セルラ通信システムに登録する、 段階を含む方法。
- 26請求項25記載の方法であって、前記移動無線電話は前記セルラ呼出し チャンネルの信号強度を所定の時間周期毎に1度測定する、方法。
- 27請求項25記載の方法であって、 登録取消し信号を前記セルラ通信信号から前記衛星通信信号に送信して前記移 動無線電話の登録を取り消す、 段階を更に含む方法。
- 28請求項27記載の方法であって、前記登録取消し信号を陸上線によって 前記衛星通信システムに送信する、方法。
Independent claims28
2 paragraphs, as filed
Description: TECHNICAL FIELD [Detailed description of the invention]
Registration of location of cellular satellite communication system Field of invention The present invention relates to advanced satellite communication systems that handle mobile phones, and in particular, Mamoru. Regarding the interaction between the star system and the mobile phone in standby mode. Background of the invention When the mobile phone is in standby mode, that is, free mode, the free mobile phone is in communication mode. Hearing the signal radiated from the stem, is the mobile phone called or it Must know when. An attractive communication system from the user's point of view When the mobile phone is within range, the land cellular system, or the land cellular system Dual-mode satellite that listens to the satellite system and connects calls when not within the stem / It will be a cellular phone. The main advantage of such a dual system is at any given time. The number of subscribers outside Lula Coverage is only a small part of the total number of subscribers, and the satellite system The number of subscribers who need access to the stem is small. This will A satellite system with a limited capacity is much larger than its capacity otherwise. To handle a large number of subscribers, perhaps 100 times the equivalent ratio of cellular systems Can be done. In addition, the subscriber listening to the calling channel, i.e. free The number of is 20 to 200 times the number of subscribers who are actually busy. Therefore, double mode The number of possible subscribers to the satellite / cellular system is 2, the call capacity of the satellite system. It is 000 to 20,000 times. In such a dual-mode communication system, the network puts a particular mobile phone into a land cell. It is desirable to know whether to call by the satellite system or the satellite system. But on top Considering that you can increase the number of subscribers by 100 times as mentioned, each of both systems When a subscriber is called, the load on the calling channel becomes very heavy. Therefore, the satellite Sith Subscribers calling / paging on the system are currently listening to satellite calling channels It is desirable to limit it to mobile phones that are known or expected. Se In the Lula communication system or satellite communication system, the area to be paged / called is It is necessary to limit it to the area where the called mobile phone is considered to be located. Cellular Since the system and satellite system are almost global, the page that calls each mobile phone in the world It is difficult to provide a ging capacity. This issue is resolved by registration. Registration is a mobile phone network that tells you which calling channel you are currently listening to. To notify. This allows the net to be in a number of limited paging areas. Find out where this mobile phone is most likely to be and make a call to this mobile phone Broadcast to the paging area. This process involves different venues within the same paging area. Includes sending calls to mobile phones via transmitters at several base stations in the area. In this case, the paging load per transmitter will increase, but the transmission to be heard will be stronger. The network does not require the mobile phone to send a registration message every time it finds a credit device. The load of processing re-registration is reduced. In this example, the broadcast switched for surveillance is before Only if you find that you belong to a different paging area can you re-register your mobile phone Good. The paging areas and re-registration criteria mentioned above are well known in this art. .. It is used, for example, in the pan-European GSM cellular system. To have an economically useful capacity to serve a large number of subscribers, satellite systems We need to be able to reuse the available spectrum over and over again worldwide. This is a multi-spot that divides the illumination of the selected service area into many smaller areas. Achieved by the beam antenna. Ideally, U.S. Patent Application No. 08/179 , 953, "Highly Reusing Cellular / Satellite Communication Systems", 199 Available by using the invention described in, filed January 11, 2004. The spectrum can be reused within each small area. This patent is shown as a reference Su. The most promising satellite systems for such applications are near-earth orbit and stationary orbit. It's on the road. The drawback of satellites in geosynchronous orbit is from a distance of 40,000 km A huge antenna is needed to make a spot beam of the same size. The extra delay in the signal traveling over the distance causes problems in two-way conversation. To. However, the drawback of satellites in near-Earth orbit is that they move as they orbit the Earth. It moves, and therefore the area illuminated by the spot beam changes. Spot Bee Even if you take steps to direct the satellite to almost the same area, the satellite will eventually pass through the horizon, so You have to change to the rising satellite. At this time, let's cross the horizon All subscriptions to free-mode mobile phones that were listening to the satellite paging channel That one is now listening to a new paging channel on a new satellite You must avoid trying to re-register at the same time. As mentioned above, free The number of mobile phones in mode is the capacity that the satellite system can handle traffic. Much more. Therefore, the problem of mass registration is difficult to handle. Outline of the invention To solve the re-registration problem mentioned above, the paging area is satellite spotted. It is desirable to define it in absolute coordinates related to the earth, not coordinates related to the earth. I. The satellite system covers which areas its various satellites and spot beams I know what to do. Therefore, if the absolute position of the approximation of the mobile phone is also known, a predetermined transfer The system decides which beam to use to page the mobile phone. Can be done. The typical diameter of a spot beam is 100-1,000km Therefore, it is sufficient for the mobile phone to determine the approximate position and register it. Implementation of the present invention In the aspect, it is enough for the mobile phone to inform the net which paging area it is in. It provides an easy way to determine your absolute position within accuracy. One embodiment of the invention determines the location of a mobile radiotelephone within a satellite communication system. Disclose the method. First, mobile radiotelephones scan multiple paging channels Then measure the signal strength of the paging channel. Next, mobile radiotelephones are the most Select a paging channel with strong signal strength and broadcast on the selected channel Decrypt the information that has been created. The information contained in the paging channel is based on the surrounding information. May include the frequency and time slots of the paging channel in the pot beam it can. The mobile station then sends the paging channel signal in the surrounding spot beam. The intensity is measured and the measurements are quantized to determine the approximate location of the mobile radiotelephone. Another embodiment of the invention re-registers a mobile radiotelephone in a satellite communication system. Disclose the method. First, mobile radiotelephones have multiple paging channel signal strengths. The degree is measured and the measured signal strength is used to calculate the absolute position of the mobile radiotelephone. Next In addition, the mobile station determines whether the absolute position of the mobile station has changed by a predetermined amount, When the anti-position changes by the predetermined amount, it is re-registered in the system. A brief description of the drawing These features and advantages of the present invention will be appreciated by those skilled in the art by reading the following description along with the drawings. It becomes clear easily. FIG. 1 shows a satellite communication system according to an embodiment of the present invention. FIG. 2 shows a flow of a method of determining the position of a mobile radiotelephone according to an embodiment of the present invention. This is the figure. FIG. 3 shows a mobile radiotelephone in a satellite communication system according to another embodiment of the present invention. It is a flow chart of the method of re-registration. FIG. 4 is a flow chart showing another embodiment of the present invention. FIG. 5 is a flow chart showing another embodiment of the present invention. Figure 6 shows the interstitial beam in the 3-color / 3-channel example. It is a figure of arrangement. FIG. 7 is a flow chart of call information in a network according to an embodiment of the present invention. Detailed description of the preferred embodiment FIG. 1 shows a plurality of mobile radio telephones 12 that communicate with a hub station 100 via a satellite 110. Indicates 0. The hub station is connected to the public switched telephone network PSTN, for example, via a local exchange. Calls between mobile phones and any telephone subscriber worldwide, and between satellite phones To enable. Satellite 110 has a relatively low microwave frequency, eg 1,6. Receives a signal from a mobile radiotelephone at 00MHz. At this frequency, it is battery-powered The transmitter in the telephone is efficient and its antenna is small and omnidirectional. Mamoru The star converts the received signal from 1,600MHz to a higher frequency and turns it into a hub station. Relay. The main reason for using higher frequencies is the satellite-to-hub link The bandwidth required for is low bandwidth allocated to 1,600 MHz for each beam This is because it is at least n times. However, n is the number of beams. For example, 6MHz If the bandwidth is reused by 37 beams at 1,600 MHz each, is it a satellite? The link to the hub requires a bandwidth of at least 37x6 = 222MHz .. This low minimum bandwidth is the preferred way to maintain coherent beam signal transmission. You need at least twice as much, and the same amount in the opposite direction, so you need 1GHz bandwidth. Is. This is a carrier wave of about 20 GHz for the round-trip link between the satellite and the hub. Indicates that the frequency is appropriate. At this frequency, the dich of a relatively small hub station Even in Shu, the bandwidth is very narrow, so any one system uses this bandwidth exclusively. No need to use, the straight line connecting the 1st ground station and the 1st satellite does not intersect the 2nd satellite As long as you can reallocate the entire bandwidth to other satellites or ground stations without interference To. Intersections can be prevented by assigning unique "stations" to satellites in geosynchronous orbit. Can be done. Also, in the case of a moving low earth orbit satellite, the probability of crossing is low, and it also intersects. It can be handled by providing another hub that is activated when a difference occurs. In one embodiment of the invention shown in FIG. 2, at step 200, the mobile phone is paged. Scan a large number of frequency channels or time slots where broadcasts are likely to be found To. Then, in stage 202, the mobile phone has the strongest signal strength paging. Determine the channel. At stage 204, the mobile phone page of the selected channel Decoding the paging channel broadcast and paging channels in the surrounding spot beam Information about the frequency or time slot of the decrypted paging channel Get information about the current absolute coordinates of the center of the beam. Then, at stage 206, move The mobile phone measures the signal strength of the paging channel in the adjacent beam. Step On floor 208, the measurements are coarsely quantized, for example the paging to which the mobile phone is adjacent. Can the channel be decrypted, and if so, what percentage of the time Or, the error rate can indicate how many bits. In this way, Pagen Mobile electricity far from the center of the beam, using a wider variety of channel codes You can decrypt messages addressed to the story. The reason why paging channels are better for measuring signal strength is paging This is because the channel is known to be always active. Telephone Trahi It is also possible to measure the signal strength on the channel that carries the clock, but this is the case. Channels may use so-called discontinuous transmission (DTX). Purpose of DTX Saves transmitter power when one direction of a double phone conversation is temporarily silent Is Rukoto. The traffic channel actually used contains a signal temporarily The paging channel always contains a signal, although it may not be. Certainly Whether it contains a valid signal, for example, depending on whether the signal can be decoded correctly. If it is possible to determine the signal strength using the traffic channel, it can. This can be done when the signal strength is high, but not when the signal strength is low. .. The paging channel has a dedicated frequency (like an FDMA system), or Use a dedicated time slot (like a TDMA system) or a dedicated code Diffuse spectrum transmission (like CDMA systems), or any mixture of these Consists of. Regardless of which access method you use, it is called a "paging channel". The term, unlike traffic, is the frequency used to broadcast paging information. Including any unique combination of numbers, time slots or codes. U.S. Patent Application No. 08 / 179,953, "Highly Reusing Frequency Cellular / Satellite Communication System , filed on January 11, 1994, both transferred As shown here as an example, each point on the earth is close to the center of the beam of one channel. Describe how to successfully radiate channels in slightly different directions so that There is. The purpose is to have a large number of channels and any specific movement from among them. To provide a system that allows you to select the channel that goes straight to the phone Therefore, depending on the position of the mobile phone, the direction of the beam must be shifted in this way. Avoid possible beam edge losses. Available to show this The conventional system and the above when it is very simplified with only 3 communication channels Consider the system based on the US patent application cited in. This example is for FDMA So the three channels are actually three different frequencies called black, red and green To. In conventional systems that do not use the novel method of US patent application described above, satellite ante Numerous, eg 37 ante, determined by the fixed physical properties of the system A nabeam is provided and used to illuminate the so-called spot coverage area of the earth. .. Conventional knowledge is that the gain of the worst point in the middle of the three spots is maximized. The reason is that the gain at the middle point is about 4 dB lower than the maximum gain at the center of the beam. This is the case when selecting the beam width. This, on the one hand, is a loss, according to conventional theory. Lost Widening the beam in an attempt to reduce the maximum gain decreases, on the other hand the bee If you narrow the length and increase the maximum gain, the bee will be far from the center as before. It is considered to be the best compromise in the meantime, as the loss at the end will be large. After making this compromise, traditional systems must make the following decisions: sand That is, do you use all three frequency channels for each of the 37 adjacent beams (just? However, in this case, the mobile station at the middle point of the three beams is all three beams. Receives equally overlapping signals from each frequency, i.e. adds to each required signal It will be subject to two equal strengths of interference. ), Or on the other hand this interference Divide the frequency between the beams with a 3-cell frequency reuse pattern to avoid the problem of Ruka. In the latter case, if the mobile station is at the middle point of the three beams, then 3 It receives all three frequencies of equal intensity from two different surrounding beams. However, There is only one frequency from each beam and drying from the side lobes of distant beams Wataru is a little small. If the mobile station is at the midpoint between the two cells, then at two frequencies, etc. The signal strength of the third frequency is somewhat less than that of two equal signals. .. Of course, if the mobile station is in the center of the cell, it will mainly receive the frequency of that cell, The surrounding six cells receive somewhat lower signal strength on the other two frequencies. Obey The mobile station determines its approximate position based on the relative signal strength of the three frequencies. Obtainable. For this example, all three frequencies in question are paging. Being a channel and the same 3-cell reuse pattern to get through phone traffic Further assume that there are three other pairs to distribute in. Which beam is the mobile station Is accurate enough for a group of beams to decide if they should broadcast a call to themselves All you have to do is know the location of. Notifying the system via satellite is a climb This is the purpose of the recording procedure. In this exemplary conventional system, the mobile station is in its position. Quantize for the following purposes. 1. Mainly receives red beam No. k (k = 1 to 12) 2. Mainly receives the black beam k (k = 1 to 13) 3. Mainly receives the green beam k (k = 1-12) Four. Receives red (i) and black (j) almost equally 5. Receive red (i) and green (j) almost equally 6. Receive green (i) and black (j) almost equally 7. Receives red (i) and black (j) green (k) almost equally The category above defines a sub-region that is 6 times the beam, so roughly speaking, it moves. The station can quantize its position to one-sixth the area of a one-spot beam. Mobile stations broadcast on the beam as a criterion of where they belong in the above category It can be used whether or not the paging information can be decrypted without error. Paging messages and broadcast information are constantly sent on the paging channel It is protected by error correction coding and error detection coding. Error correction coding is tatami A built-in code is desirable, and a cyclic redundancy check code (CRC) is desirable for error detection. .. If the CRC of the decrypted message inspects> 50% of the message, move The motive quantizes this as "receive the beam". CRC <50% of message When inspecting, the mobile station quantizes this as "not receiving the beam". Therefore, "Receive" is a decision only for the green beam, "not receive" is for other colors If it is a quantization decision, the mobile station belongs to category 3. Information in the green beam By reading at the coordinates of its instantaneous center, the mobile station quantizes these coordinates. Considered as a rough (coarse) position. If "reception" is quantized for all three color beams If the decision is made, the mobile station is in category 7 and is in the beam from the broadcast information. By reading the coordinates of the mind, the mobile station says that its position is in the middle of the three beams. Can be calculated. For example, the first color has a 95% correct CRC and the second color has a 45% correct CRC. More precise degree of quantization by receiving a third color with a 15% correct CRC It's clear that you can. In addition, correct decoding is not just about position, but about signal strength. It can also be a clue. The relative signal strength is quantized as follows, for example. 1. Mainly red beam No.k (that is, the others are> 6dB smaller) 2. Mainly black beam k (that is, the others are> 6dB smaller) 3. Mainly green beam k (that is, the others are> 6dB smaller) 4. Red and black are equal (ie the delta is <6dB, but green is> 6d B small) 5. Green and black are equal (ie the difference is <6dB, but red is> 6dB less) 6. Green and red are equal (ie the difference is <6dB, but black is> 6dB less) 7. All equal (ie all within 6 dB) Moreover, in the case of signal strength, it is not necessary to roughly quantize. Bee that can be decrypted correctly After making some decisions, the relative signal strength is used to remember if necessary. Using the information on the shape of the beam that was broadcast or broadcast, the weight of the center coordinates of the beam The position of the mobile station can be estimated more accurately by obtaining the average. More advanced To estimate by Kalman filtering, which estimates the position and speed of the mobile station You may. However, in reality, there is a limit to the speed. Especially, the satellite motion is corrected If the satellite beam moves on the earth because it is not, the position is estimated for several tens of minutes. The constant is flattened by Kalman filtering within several different categories mentioned above. Based on a leveled estimate. If such a position can be estimated, the mobile station has moved sufficiently since it was registered last time. Therefore, it is possible to decide whether or not it is better to re-register. However, re-registration is transferred This is done because the absolute position of the motive has changed, and the movement of the satellite has not been corrected. Therefore, it is not done because the beam moves on the earth. The above explanation about the conventional FDMA 3-cell frequency reuse system is Q. If the title 3 channels are 3 different time slots in the TDMA system Can also be extended. In this case, there are three paging channel bursts Mobile stations by periodically circulating between adjacent beams and undergoing the entire cycle Is mainly within one beam (deep into two out of three slots) due to changes in amplitude It is in the valley of a large amplitude and one strong signal) or in the middle of 3 beams (the fluctuation of the amplitude is almost the same). You can decide whether or not. This description is then incorporated into the novel beam configuration referenced in the relevant disclosures above. Expand. In this new system, the beam direction is not always specific physical Interpolation of electronic beams, not restricted in the direction associated with the interior structure By using it, it is possible to take a continuous direction. For example, in the middle of 3 beams The mobile station in is using which beam for communication and causes a signal loss of 4 dB. Instead, the satellite takes one-third of the energy directed to that mobile station in all three cells. By transmitting in a coherent manner, a virtual (virtual) sword directed to the mobile station Chi Can receive the beam of the gap. All points that direct the beam in such a gap In order to optimize the minimum gain in, give an optimum beam width different from the conventional one, and almost You can get a fairly high minimum gain with the same antenna aperture. Figure 6 shows a pair of black beams that can be considered to correspond to a conventional beam. The morphology of the red and green beams in the gap between them is shown. The big circle is the cross of the conventional beam Represents the over-diameter. In the conventional method, the beam is used for communication up to the end. small The circle tells you how much of the beam diameter you need to use for new methods of communication. Shown. The black part of the black beam emphasizes this, using the black beam Mobile stations use only about one-third of the diameter of the black beam and then a better choice Indicates switching to a beam with a red or green gap. In fact, communication channel There are far more than three, and each means creates a staggered beam of space, so each bi It is only necessary to use the route 1 / n of the conventional beam radius. However, n is The number of channels. It is tentative to combine one set of virtual beams with each set of FDMA of 256 frequencies. In principle, the center of the beam is the same as the conventional spot beam coverage area. It can be distributed to 16x16 grid points in the same area. All 256 frequencies By measuring all signal strengths, the mobile station is most likely in its own position. You can make a 2D plot of 16x16 measurements. Most likely The mathematically correct way to determine the position best applies to 16x16 measurements. Beam pattern by finding the optimum north-south and east-west displacement of the curve Applying a curve of the same known shape to the measured value. In a TDMA system with 256 time slots on a single carrier frequency, the time It moves systematically through a 16x16 grid from the inter-slot to the time slot and it The center of the beam can be programmed to repeat. Place of TDMA In that case, it is easier for the mobile station to collect 16x16 measurements. The reason is , To collect signal strength measurements in all time slots, one TDMA frame Inflate the same frequency for each room (swell) and apply the two-dimensional curve described above. This is because the estimated value of the position of the mobile station should be determined. Then these estimates May be further averaged by the Kalman filter method described above. If the received paging channel is weak, it is under the same channel interference Even if there is a traffic channel in the current beam that uses the same frequency Ancillary that mobile phones can use to determine from a paging channel The method is the subtraction disclosed in U.S. Pat. No. 5,151,919, which was assigned together. It is a demodulation method. This patent is shown here as a reference. By the method disclosed here Decoded the strongest of many overlapping signals and decoded it from the received signal It pulls a signal and decodes the next strongest signal. As a result, there is strong interference when decoding More accurately the weak signal in the paging channel by pulling the signal It can be decrypted. In addition, mobile phones signal on traffic channels that they can decode. Intensity can also be measured. Different channels simply have different Ts of the same frequency It may be a DMA time slot and does not necessarily have to be at a different frequency. Satellite communication Depending on the communication system, energy from satellites can be transferred to individual mobile phones and calls. The inter-slot base allows you to point again in the time slot, so spot The beam is thought to orbit within a limited area in a way that the system knows. Can be Therefore, when, that is, in which time slot, mobile phones are more A report of whether you got a higher or lower signal strength about your current position Can give a great clue. Mobile stations that have just been turned on have previously registered with the satellite system and then relocated. May be. To be able to contact the mobile station, the mobile station has moved You must decide if you want to and re-register your new location if you move. Subordinate Therefore, the mobile station can scan the satellite signal and measure the signal. Find a channel or active traffic channel. This is the flow of Fig. 3. It is shown at stage 300 in the figure. Then, in step 301, the mobile station detected paging. Measure the signal strength of the channel. If the mobile station is not currently registered with the satellite Mobile stations will be registered anyway, so position before accessing the satellite You don't have to decide if you changed. In this case, proceed to step 304 and move on. The motive station accesses the satellite. In response, the satellite becomes a mobile station at stage 305. Allow access. In this case, if necessary, add a traffic channel to the satellite. Allocate timely to allow for long exchanges. Therefore, the mobile station is already in stage It is desirable that the 304 access request determines the estimation of the position and informs the satellite. However, another method is also disclosed here. For example, a satellite system receives all that Determine which of the virtual beams has the strongest mobile station random access signal And the mobile station in the same way that the mobile station estimated its position from satellite signal measurements. The position of can be estimated. In this way, the satellite will be unique, if necessary. Guess which traffic channel and beam combination is best suited for mobile stations Can be determined. The reason for the longer exchange is that the satellite system authenticates the mobile station By (authentication), the mobile station that has invaded from the outside becomes a true mobile station. This is because we want to make it impossible to change the registration information stored in. However, the mobile station whether the previous registration seems to be still valid and needs to be re-registered If you don't know, the system doesn't want to incur unnecessary re-registration loads. Subordinate So, at stage 302, the mobile station determines its position before trying to send it to the satellite. Must be determined. At this stage, the mobile station is broadcast on the paging channel Read the information on the center position of the current beam, and estimate the position along with the measurement of the signal. It is necessary to use it regularly. Then proceed to step 303, where the mobile station estimates the new location. Compare the value with the estimated position in the last registration. Mobile station is above a certain threshold If you have moved a lot, for example more than -1dB beam radius, the mobile station will be in stage 3. Go to 04 and re-register. On the other hand, the mobile station has not moved more than this threshold If so, the mobile station goes to stage 308 and goes into power down mode to save power, Launch Immer. When the timer issues an alarm (this is the mobile station selected The moment you are paging on a paging channel (ie that time slot) It has been adjusted to almost exactly match. ), Mobile station is paging chan Rescan the flannel to measure the signal (this is for the mobile station to update its position estimates. Use. ), And repeat this cycle. When the mobile station decides that it is necessary to re-register at stage 303 and proceeds to stage 304 In that case, the mobile station satellites all the position estimates or measurements already made in the access request. Can be sent properly to. However, this is less for this and the mobile station ID This is the case when there is at least 34 bits of margin in the data format. Former If there is room in the signal, estimate the position, if any, and the measured value of the signal, if not. , The mobile station sends. What information about the center position of the beam on the paging channel Even if the mobile station cannot estimate the position because it cannot be read, the measured value May exist. For example, a link between a satellite tracking system and a paging transmitter Temporarily unavailable due to system malfunction, such as a malfunctioning link If. Communication already at stage 304, or during a long exchange at stage 306, or thereafter And if the satellite can be informed of its position or signal, then the satellite system Combine these with your own measurements of mobile station signals to get the correct position Can be done. At step 307, this exact location is given to the mobile station when confirming re-registration It can be returned at will. In this case, the mobile station compares with future estimates at step 303. Remember this exact position to do. Also, the satellite system is on par with the mobile station ID. All mobile station positions are stored in memory, and this position is stored in a coded format. Tell the cellular home position record (register) of. More often annoying re-registration issues in dual-mode satellite / cellular communication systems Can occur. For example, when the cellular signal disappears, the mobile phone is ground-based. Not the cellular call channel of the Lula system, but the paging of the satellite system Or consider the case of listening to a calling channel. Installed in a car running on the highway Cellular signal loss is very common on mobile phones. For example, crowds between big cities However, on the highway, there is a cellular coverage gap at a specific point, and satellite / se Zones where all mobile stations with Lula phones are not covered by the cellular system Attempts to re-register with the satellite system when entering. Usually, the cellular system This is a problem as the mobile phone will not try to re-register if Baresi does not exist Not. In addition, the size of the cells in the cellular system is probably 1 larger than the satellite cells. Since it is 00 times smaller, the systematic re-registration load mentioned above can be easily handled. Wear. However, in satellite systems, such a large amount of re-registration can be a problem. Therefore, another object of the present invention is that the vehicle normally passes through a hole in the cellular coverage. Sometimes it is to avoid over-re-registering with the satellite. As shown in FIG. 4, in one embodiment of the present invention, it is fixed to a cellular communication system. Although the mobile phone being used monitors the desired calling channel at stage 400 , Of adjacent calling channels that can be used instead when the signal is lost I also have a list. The paging area has a large number of base stations, so mobile power Calling messages for the talk are sent from there at the same time. Two mobile phones Eliminates the constant re-registration when moving along the boundaries between geographies Therefore, it is desirable to send a call message from a group of surrounding base stations. .. If the net simply knew that the mobile station was listening to either of the two base stations Well, send pages about all base stations. The group of this station is "Paging area" Since it sends a "region ID", the mobile station has a different paging region ID within the group. It is possible to detect when to switch to one base station and listen. Only in this case, re-register is required. Normally, at step 402, the base station is a peripheral station that the mobile station can receive. Broadcast a list of calling channel frequencies. The base you are currently monitoring at stage 404 When the mobile station detects that the signal quality of the ground station has fallen below a certain threshold, the stage On floor 406, the mobile station scans a list of different calling channel frequencies, step 40. At 8, switch to this if the quality of one signal on another channel is above the threshold Eh. In some systems, such as TDMA systems, the mobile station supervises the current base station. Have spare time in the slot for some time while watching and the signal of the current station To constantly and efficiently scan another list in it, without waiting for the quality to deteriorate. Can be done. If the mobile station switches to monitoring a different base station, the paging group ID will be the same. There is no need to re-register unless it is not the same. But the new base station is around Broadcast another list of calling channel frequencies for the base station, which the mobile station now does Scan. After all, the mobile station switches to a station that is not in the original paging group, so Re-registration procedure is required. In conventional technology, each mobile station is from the currently monitored base station to the surrounding base stations. The paging area of each mobile station is defined by the system as the same because it gets the same list. Is done. Special paging for each mobile station in U.S. Patent Application No. 07 / 882,607 The method of giving the area is disclosed. This method is especially useful when re-registering To download a list of different calling channels for. The net does this You have to remember and paging a specific mobile station for all these channels Know that it will not be. Therefore, when re-registering, in the paging area of the mobile station Re-registration is required by resetting the mind near the actual position of each mobile station You can delay the time to become. On the other hand, if there is no other calling channel that meets the signal quality criteria at step 408. At stage 410, the mobile station is cellular before moving too far from the current base station By unregistering the system, you are entering a "black hole" Report that. At stage 412, the cellular system moves within the cellular system Notify the satellite system of the latest location of the station. This is because the satellite system goes to the mobile station The position is accurate enough to determine a suitable paging beam. Then, at step 414, the mobile phone is switched from cellular mode to satellite mode. Step On floor 416, the mobile phone determines the strongest satellite calling channel, then step 4 At 18, monitor the selected paging channel. Next, the mobile phone is a satellite It is not necessary to register it in the system, and its absolute position is estimated from the measured value of signal strength. Therefore, there is no load of registering with the satellite. When unregistering from the cellular system the mobile phone is absolutely from the satellite signal Estimates the position, so after the next move, the stage without finding the cellular signal again If you find that you have changed its position above the threshold on floor 306, then the satellite Re-register directly with the system. Mobile phones are at least hours and hundreds of kilometers This is not an unnecessary re-registration, as I did not contact Cellular during Le Is certain. In stage 412, the cellular system becomes a satellite system within the cellular system Notified of the latest known location of the mobile station, but an alternative is the dual mode satellite / Callers to cellular mobile stations do not necessarily go through the satellite system at first, but calls are added "Ho" of the mobile phone in the mobile exchange center belonging to the cellular operator who is on It can be understood by remembering that it goes through the "location record". At another stage 413, satellite The system or cellular system is a home location record or visitor location record (Regis It is possible to notify the latest known location of the mobile phone. With a cellular system Before about how to contact a mobile phone when it is fixed to a satellite system As explained in, the information on the current position of the mobile station and the route of the call is in the VLR in the HLR. Must be remembered as an ID. VLR or visitor location record is another It is located at the Cellular Exchange Center and is temporarily registered in the area. Holds information about mobile stations. But across the PSTN, where each mobile station is now I don't know if it is registered in. I know where the mobile station's unique exchange is There is, that is, only the route of the mobile station to the HLR. Therefore, the call of PSTN The person first searches the HLR for a route to the VLR where the mobile station is currently registered. FIG. 7 shows an example of the flow of call information in such a system. Send a call to a mobile station If so, the PSTN will contact the mobile station's HLR for the latest location (VLR ID or Determines the virtual VLR ID). In the HLR when sending a call to the cellular system Send a call to VLR using the VLR ID stored in. Next, VLR is HL Request authentication and encryption information from R. So VLR sends a call to authenticate the mobile station .. However, when sending a call to the satellite system, the virtual VLR ID is sent to the satellite ground station. Send, the ground station requests HLR for warranty information. When the satellite ground station receives warranty information , Mobile station paged with satellite beam covering absolute position associated with VLR ID Be googled. Therefore, when canceling the registration of a mobile station, the satellite system knows the cellular system. It is enough to remember the appropriate virtual VLR ID associated with the absolute position .. However, because of this, when the mobile station cancels registration from its cellular area, Cellular exchange system to store the default virtual VLR ID in the HLR Must be reprogrammed. Default VLR ID uses this invention It is provided by the satellite system, and the VLR ID is the absolute VLR. Related to satellite paging areas. There are other methods, but these are all the spirits of the present invention. Believed to be within range with God. For example, a VLR whose mobile station registration has now been deregistered Just notify the HLR that the mobile station is no longer registered there I. Then, the HLR involved in providing the subscription of the dual mode satellite / cellular finally visited. Which satellite virtual VLR ID replaces the questioned VLR ID with the default value You have to decide. Or HLR contacts the satellite system Feelings You may search for information. The purpose of this alternative was to deal with dual-mode satellite / cellular phones. Reprogramming to eliminate the need to reprogram the entire cellular system If there is a need for mining, limit it to systems that offer dual mode subscriptions. Or even by limiting such programming to satellite system elements only. is there. In yet another way considered to be within the spirit and scope of the invention, the mobile station is registered. VLR does not notify HLR that there has been a change when canceling. PST Only when N next tries to call a mobile station will the HLR be a mobile station from the VLR. You will be notified that you are not registered. Next, HLR defaults to satellite interaction Contact the conversion center and notify them of the last VLR ID that the mobile station was registered with To. The satellite system associates the VLR ID with its absolute paging area. Remember the call and send the call to the paging area where the mobile station is most likely to be found .. The problem is resolved when the mobile station initiates a call. That is, the satellite system is a mobile station Registered correctly after being notified of the clear location of the HLR, and the HLR will give you a suitable virtual VLR ID. Remember. The capacity of the cellular system moves regularly from a systematic "black hole" Re-registration from satellite to Cellular, as it is believed that there is enough to register by phone The problem is not the problem of capacity, but the problem of power consumption of mobile mobile phones. Den When using the pond as a power source, listen to the satellite system and listen to the cellular system at the same time. It is not desirable. In another embodiment of the invention, the mobile station is in a cellular system. If you find that you can register, do not cancel the registration of the mobile station of the satellite system. , Re-register the mobile station in the cellular system. When can I register with the cellular system? The detection method will be described below. In this case, the cellular system goes through the land line Send a deregistration signal to the satellite system, for example, is the mobile phone already a satellite system? You can notify that you do not need to page. From PSTN to mobile phone If all the calls in the above always first refer to the HLR to get information on the current position, then I don't need this. In this case, the physical cellular VLR that the mobile station has just re-registered It is sufficient to overwrite the address with the virtual VLR ID of the satellite system. In the GMS system, the subscribers of a company that provides a particular service are those of that company. One of the cellular telephone exchanges, or exchanges, has a corresponding data record. This record is called the home position record (register) or HLR, and its communication system. Contains the latest known location headings for mobile phones within the service. For example, a mobile phone When you enter a foreign GSM and turn it on, the mobile station will tell you which calling channel the signal is strong. Determine if the degree is strongest and send a registration request to this foreign system. This request is my mother Shows the country's HLR and this foreign system authenticates the identification of this mobile phone Contact this HLR by international circuit to obtain data. Authentication is complete And this mobile station is registered in the visitor location record (VLR) of the foreign system, mobile station The position of is sent to the HLR and stored. After that, the telephone system is optional all over the world Any call from the caller of is automatically first queried to the HLR to get the current VLR position , Then query the VLR. In the present invention, the dual mode mobile phone sends a deregistration message to the cellular system. The cellular system will contact the HLR to provide the current location data from the VLR. Change to a satellite system. Furthermore, since the absolute position is stored in the HLR, the satellite The system may obtain this, or the HLR sends this position to the satellite system. You may. The opposite is true when a mobile phone re-registers from a satellite system to a cellular system. It will be about. All VLR softs in performing satellite-related location and registration functions Alternatively, VLR can be used so that you don't have to change your software. Performs the normal functions of. HLR where the registered phone has satellite function Provides information related to a VLR that has undergone registration or deregistration of one of its mobile stations. Determine the coordinates of an equivalent satellite system by finding it in the table. This place If necessary, the HLR may notify the satellite system of the approximate location of the mobile station. I. If cellular mode and satellite mode operate at the same time, the power of the mobile phone Consumption is still a problem. This is because the mobile phone is fixed to the satellite and the cellular signal is It happens when there isn't. The reason is when the cellular call channel can be re-received This is because we need a way to detect it. Mobile phone standby in cellular system Special features have already been built in or will continue to be used to reduce power Since it is expected, it is usually too much battery power to listen to the cellular call channel Does not consume. One of the main methods used is the dormant mode group. For example Mobile phones are based on the last digit of the phone number or the sum of the numbers in the phone number. Assigned to a subgroup, calls to that group are expected by the mobile station to wake up Moreover, it is sent only in a slot for a certain period of time when it can be received. Therefore, mobile station Is off for at least 90% of the time. However, the mobile station goes into dormant mode You can enter a dormant mode group that is fixed to a calling channel Only when is identified. In the present invention, satellite call channels can also create dormant mode groups. This allows the mobile phone to enter its satellite call channel mode for only a portion of the time. Can only be active. In principle, mobile phones take a fraction of a second Only, for example, every 20 ms to scan one of 1,000 cellular channels Wake up for 1 millisecond. In this case, there are 2 channels with large energies. Identified in 0 seconds. This is enough response time to switch back from satellite mode to cellular mode Between. However, both power consumption and response time are currently due to the calling channel beam. Satellite Call Cha for a list of cellular calling channels in the illuminated area It can be improved by broadcasting on the channel. As shown in Fig. 5, At stage 500, each satellite paging channel has a cellular calling channel frequency Broadcast the list. Then, at stage 502, the mobile phone is at the ringing channel frequency In response to the list, in step 504, measure the signal strength of the cellular call channel. .. Transfer to staying in a cellular black hole and temporarily listening to satellite calling channels The motive is that the calling channel probably has the same frequency in the 21 cell reuse pattern. Possible call channel frequencies of 1,00 based on reusability It can be limited to 0 to 21. Therefore, which frequency in a given area is selected All you have to do is notify the mobile station. When using sleep mode, check if there is a call channel that can be received. To check, the mobile phone has its cell receiver every 20 seconds, probably 21-63. It only needs to be active for milliseconds. As a matter of fact, the active time is cellular It is determined by the speed at which the synthesizer can change the frequency, and it is a cellular receiver. Wake up once every 20 seconds, and the cellular synthesizer can change the frequency By scanning all possible calling channels at the same speed and returning to dormancy , Perhaps can be minimized. Then, in step 506, the mobile phone has a predetermined signal strength for one of the calling channels. Determine if the threshold of is exceeded. One signal on the cellular call channel If the intensity exceeds the above threshold, at step 508, the mobile phone is set. Register with the Lula communication system. Those skilled in the art will recognize this invention in other ways without departing from its spirit or important features. You will understand that it can be achieved in a fixed format. Therefore, the embodiments disclosed herein Is exemplary in all respects and not restrictive. The scope of this invention What is shown is not the above explanation but the scope of claims, meaning its equivalent. The taste and all changes within range are included in this.
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Every citation, both ways
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192 members in 19 offices
Priority claims9
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| EP0801876A2 | European Patent Office (EPO) | A2 | |
| FI973461A | Finland | A | |
| FI973461A7 | Finland | A7 | |
| FI973461L | Finland | L | |
| MX9704862A | Mexico | A | |
| NO974126L | Norway | L | |
| EP0811277A1 | European Patent Office (EPO) | A1 | |
| BR9510137A | Brazil | A | |
| EP0815692A2 | European Patent Office (EPO) | A2 | |
| US5708971A | United States of America | A | |
| CN1176729A | China | A | |
| WO9812571A1 | World Intellectual Property Organization (WIPO) | A1 | |
| WO9812848A1 | World Intellectual Property Organization (WIPO) | A1 | |
| AU4260597A | Australia | A | |
| AU4481797A | Australia | A | |
| EP0662758A3 | European Patent Office (EPO) | A3 | |
| CN1181851A | China | A | |
| CN1183879A | China | A | |
| KR19980702470A | Republic of Korea | A | |
| US5790606A | United States of America | A | |
| KR19980702998A | Republic of Korea | A | |
| US5812947A | United States of America | A | |
| JPH10512115A | Japan | A | |
| EP0879423A1 | European Patent Office (EPO) | A1 | |
| US5848060A | United States of America | A | |
| SG55053A1 | Singapore | A1 | |
| JPH11500880A | Japan | A | |
| AU701680B2 | Australia | B2 | |
| CA2297700A1 | Canada | A1 | |
| WO9905832A1 | World Intellectual Property Organization (WIPO) | A1 | |
| AU8585298A | Australia | A | |
| TW353835B | Taiwan Province of China | B | |
| CN1210590A | China | A | |
| AU703051B2 | Australia | B2 | |
| US5907809A | United States of America | A | |
| AU2393299A | Australia | A | |
| EG20504A | Egypt | A |
Numbers
- Publication
- 8-510610
- Publication, DOCDB
- H08510610
- Publication, EPODOC
- JPH08510610
- Application
- 7518672
- Application, DOCDB
- 51867295
- Application, EPODOC
- JP19950518672
Titles2
- Japanese
- セルラ衛星通信システムの位置の登録
- English
- [Title of Invention] Registration of Position of Cellular Satellite Communication System
Classification
- CPC, 3
- H04B7/1855
- H04B7/18545
- H04W64/00
- IPC, 3
- H04B7 15
- H04B7 185
- H04W64 00
Designated states1
- Regional, 1
- Mexico