WO2009096394A1 - 無線通信方法、無線通信システム、基地局、移動局 - Google Patents
無線通信方法、無線通信システム、基地局、移動局 Download PDFInfo
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- WO2009096394A1 WO2009096394A1 PCT/JP2009/051283 JP2009051283W WO2009096394A1 WO 2009096394 A1 WO2009096394 A1 WO 2009096394A1 JP 2009051283 W JP2009051283 W JP 2009051283W WO 2009096394 A1 WO2009096394 A1 WO 2009096394A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/003—Arrangements to increase tolerance to errors in transmission or reception timing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2614—Peak power aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2656—Frame synchronisation, e.g. packet synchronisation, time division duplex [TDD] switching point detection or subframe synchronisation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2668—Details of algorithms
- H04L27/2673—Details of algorithms characterised by synchronisation parameters
- H04L27/2675—Pilot or known symbols
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
Definitions
- the present invention relates to a wireless communication method, a wireless communication system, a base station, and a mobile station that perform wireless communication using an OFDM (Orthogonal Frequency Division Multiplexing) modulation scheme.
- OFDM Orthogonal Frequency Division Multiplexing
- mobile stations represented by mobile phones, PHS (Personal Handy Phone System), and PDA (Personal Digital Assistant) have been provided. These mobile stations can connect to base stations installed at predetermined distances and perform communications such as calls and data transmission / reception via a communication network to which the base stations are connected.
- PHS Personal Handy Phone System
- PDA Personal Digital Assistant
- One of the methods for transmitting digital signals used in such wireless communication systems is the OFDM modulation method.
- transmission data is distributed and transmitted to a plurality of carriers in which frequencies orthogonal to each other are set, so that the bandwidth of each carrier is narrow and the frequency utilization efficiency is very high.
- the effective symbol that is a signal period in which IFFT (Inverse Fourier Transformation) is performed at the time of transmission, and the waveform of the latter half of this effective symbol remain as they are.
- the guard interval 50 is copied. For example, if the effective symbol length is 512 samples, the guard interval 50 is 64 samples, which is 1/8 of the length, and is inserted in the first half of the OFDM symbol. In the OFDM modulation scheme, such a guard interval 50 is inserted to allow intersymbol interference due to multipath and improve multipath tolerance.
- CS Cell
- PS Personal Station
- the communication channel BCCH: BroadcastCHControl CHannel
- TCH Traffic CHannel
- the mobile station In order to establish such a communication channel, it is necessary to correct the transmission timing of the mobile station so as to synchronize with the reference timing of the base station.
- the procedure is roughly described.
- the mobile station generates a channel for timing correction and transmits an OFDM symbol to the base station.
- the base station performs timing detection using the received OFDM symbol, and informs the mobile station of the deviation from the base station reference timing.
- the mobile station corrects the transmission timing so as to eliminate the deviation from the reference timing.
- the mobile station sends a communication channel assignment request for calling to the base station at the corrected transmission timing.
- the base station transmits communication channel assignment information to the mobile station (for example, Patent Documents 1 to 4).
- FFT Fast Fourier Transformation
- a correlation peak may rise at timing 60 on both sides of the effective symbol length to which IFFT is applied (FIG. 11).
- the correlation peak may be erroneously detected, and the transmission timing correction amount in the mobile station may be erroneous.
- the present invention makes it possible to more reliably succeed in detecting the timing at the base station in the wireless communication using the OFDM modulation scheme, and to more reliably prevent the mobile station and the base station from being connected.
- An object of the present invention is to provide an avoidable wireless communication method, wireless communication system, base station, and mobile station.
- a typical configuration of the present invention is to broadcast from a base station to a mobile station in a radio communication method in which radio communication is performed between the mobile station and the base station using an OFDM modulation scheme.
- Broadcast the channel (Broadcast Control Channel; BCCH)
- BCCH Broadcast Control Channel
- a channel that is frame-synchronized with the broadcast channel in the mobile station transmit the OFDM symbol to the base station, and guard the transmitted OFDM symbol as processing of the base station Only when the correlation peak between a valid symbol and a known ideal symbol is detected and the correlation peak is detected within a predetermined timing detection range shorter than the length of the valid symbol.
- the mobile station transmits the deviation from the reference timing of the base station when the correlation peak is detected to the mobile station in a timing correction burst.
- the transmission timing obtained by shifting the transmission timing of the channel generated immediately before by the predetermined shift amount A new channel is generated and an OFDM symbol is transmitted to the base station, the base station processing is performed again, and if a timing correction burst arrives from the base station within a predetermined time, In order to eliminate the deviation, the transmission timing is corrected by adding the total shift amount of the transmission timing up to the present time, and a communication channel allocation request is transmitted to the base station at the corrected transmission timing.
- the base station provides a predetermined timing detection range, and does not issue a timing correction burst when a correlation peak appears on the outside, that is, on both sides of the effective symbol length.
- the mobile station When the mobile station does not receive the timing correction burst even after a predetermined time has elapsed after transmitting the channel generated first, the mobile station generates a new channel with the transmission timing shifted and retransmits the OFDM symbol. As a result, if the base station detects a correlation peak within a predetermined timing detection range, a timing correction burst is returned to the mobile station. As a result, the transmission timing of the mobile station is correctly corrected, the communication channel is established, and the possibility that wireless communication is connected increases.
- either of two types of channels that are generated alternately with a difference in transmission timing by a predetermined shift amount may be generated.
- channels having two types of transmission timing may be generated alternately.
- the transmission timing of the mobile station is returned to the original amount just shifted, and it is expected that the timing detection succeeds while repeating the retransmission. For example, if a mobile station fails to establish wireless communication, it has entered a so-called dead point, so if it cannot receive a timing correction burst from the base station, it will eventually be corrected as long as the mobile station leaves the dead point. Can receive bursts.
- a channel may be generated in which the transmission timing is increased or decreased by a predetermined shift amount.
- the transmission timing may be shifted continuously in either direction, either by raising or lowering the timing. It is expected that the timing detection succeeds while repeating such processing.
- the total shift amount described above should be shorter than the effective symbol length. This is because the timing detection fails if the length of the effective symbol is longer. In order to do this, it is necessary to make the shift amount of one time shorter than the length of the effective symbol.
- the total shift amount always satisfies the above condition. Also, when the transmission timing is shifted continuously in one direction, the number of shifts may be limited so as to satisfy the above condition.
- another typical configuration of the present invention includes a mobile station and a base station, and in a radio communication system in which these perform radio communication using an OFDM modulation scheme, the base station A broadcast unit that broadcasts a broadcast channel to the mobile station, a guard interval removal unit that removes the guard interval from the OFDM symbol transmitted from the mobile station via the channel generated by the mobile station, A timing detection unit that detects a correlation peak with a known ideal symbol, and a point when the correlation peak is detected only when the correlation peak is detected within a predetermined timing detection range shorter than the effective symbol length.
- a channel that is frame-synchronized with the broadcast channel is generated and an OFDM symbol is transmitted to the base station. If a timing correction burst does not arrive from the base station even after a predetermined time has elapsed since transmission, the channel of the channel generated immediately before is transmitted.
- a timing correction channel generation unit that generates a new channel having transmission timing obtained by shifting the transmission timing by a predetermined shift amount and transmits the OFDM symbol to the base station, and a total of transmission timing shift amounts in the timing correction channel generation unit
- the shift storage unit to store and the timing correction burst arrives from the base station within a predetermined time
- the sum of the shift amount of the transmission timing stored in the storage unit so as to eliminate the deviation from the reference timing of the base station
- a transmission timing correction unit that corrects the transmission timing by including the corrected transmission timing. Characterized in that it comprises a communication channel assignment request unit that transmits to the base station a communication channel assignment request at timing.
- another typical configuration of the present invention includes: a base station that performs radio communication with a mobile station using an OFDM modulation scheme; a notification unit that broadcasts a broadcast channel to the mobile station; A guard interval remover that removes a guard interval from an OFDM symbol transmitted from a mobile station via a channel generated by the mobile station to make it an effective symbol, and a correlation peak between the effective symbol and a known ideal symbol is detected.
- the timing detector detects the deviation from the base station reference timing when the correlation peak is detected only when the correlation peak is detected within a predetermined timing detection range shorter than the effective symbol length.
- a correlation peak determination unit that transmits the correction burst to the mobile station.
- another typical configuration of the present invention is to perform frame synchronization with a broadcast channel broadcast from a base station in a mobile station that performs radio communication with the base station using an OFDM modulation scheme. If a channel is generated and an OFDM symbol is transmitted to the base station, and a timing correction burst does not arrive from the base station even after a predetermined time has elapsed, the transmission timing of the channel generated immediately before is shifted by a predetermined amount.
- a timing correction channel generation unit that generates a new channel having transmission timing shifted by an amount and transmits an OFDM symbol to the base station, and a shift storage unit that stores the total amount of transmission timing shift in the timing correction channel generation unit; If the timing correction burst arrives from the base station within the predetermined time, the base station reference timing
- the transmission timing correction unit that corrects the transmission timing by adding the total shift amount of the transmission timing stored in the storage unit and the communication channel allocation request is transmitted to the base station at the corrected transmission timing so as to eliminate the deviation.
- a communication channel allocation requesting unit that uses the timing correction burst to the base station to the base station at the corrected transmission timing so as to eliminate the deviation.
- the components corresponding to the technical idea of the above-described wireless communication method and the description thereof can be applied to the wireless communication system, the base station, and the mobile station.
- FIG. 6 It is a system block diagram for demonstrating the radio
- FIG. 6 it is the sequence diagram which succeeded in allocation of a communication channel by the production
- FIG. 7 is a sequence diagram in which a communication channel is successfully allocated by regenerating a timing correction channel generated immediately before the communication channel is not allocated in FIG. 6. It is a figure which shows the structure of the OFDM symbol used in an OFDM modulation system. It is a figure which shows the case where a correlation peak is detected within the timing detection range in the timing detection part of FIG.
- FIG. 5 is a diagram illustrating a case where a correlation peak is detected outside the timing detection range by the timing detection unit of FIG. 4. It is a sequence diagram when communication channel allocation is successful in the prior art. It is a sequence diagram when communication channel allocation fails in the prior art.
- ... Guard interval 100 ... Wireless communication system, 110A, 110B ... PHS terminal, 120 ... Base station, 140 ... Management server, 200 ... Terminal controller, 202 ... Terminal memory, 214 ... Timing correction channel generator, 216 ... Transmission Timing correction unit, 218 ... communication channel allocation request unit, 220 ... OFDM modulation / demodulation unit, 314 ... notification unit, 315 ... symbol synchronization unit, 316 ... guard interval removal unit, 317 ... FFT unit, 318 ... timing detection unit, 319 ... correlation Peak decision unit, 320 ... OFDM modulation / demodulation unit, 322 ... demodulation / decoding unit, 324 ... modulation / coding unit, 326 ... IFFT unit, 328 ... guard interval insertion unit
- the mobile station When the mobile station tries to start communication, it tries to correct the transmission timing so as to synchronize with the reference timing of the base station.
- the mobile station includes various electronic devices such as a PHS terminal, a mobile phone, and a PDA.
- PHS terminal will be described.
- FIG. 1 is a system block diagram for explaining a radio communication system 100 according to the present embodiment.
- the wireless communication system 100 includes a PHS terminal 110 (110A, 110B), a base station 120, a communication network 130, and a management server 140. Wireless communication is performed between the PHS terminal 110 and the base station 120 using the OFDM modulation scheme.
- the user's PHS terminal In response to the operation of 110A, wireless communication with the base station 120 in the wireless communicable area is established, and the base station 120 requests the management server 140 for communication connection with the PHS terminal 110B via the communication network 130.
- the PHS terminal 110 includes a terminal control unit 200 that controls the entire terminal, a terminal memory 202, a display unit 204, an operation unit 206, a voice input unit 208, a voice output unit 210, And a wireless communication unit 212.
- the terminal control unit 200 manages and controls the entire PHS terminal 110 by a semiconductor integrated circuit including a central processing unit (CPU).
- the terminal control unit 200 naturally performs a call function and a mail distribution function using the PHS terminal 110 using the program in the terminal memory 202.
- the terminal memory 202 includes a ROM, a RAM, an EEPROM, a nonvolatile RAM, a flash memory, an HDD, and the like, and stores a program processed by the terminal control unit 200, audio data, and the like.
- the display unit 204 includes a liquid crystal display, EL (Electro Luminescence), PDP (Plasma Display Panel), etc., and is stored in the terminal memory 202 or provided from an application relay server (not shown) via the communication network 130.
- the GUI Graphic User Interface
- the Web browser or application can be displayed.
- the operation unit 206 includes switches such as a keyboard, a cross key, and a joystick, and accepts user operation input.
- the voice input unit 208 is composed of a voice recognition device such as a microphone, and converts the user's voice input during a call into an electrical signal that can be processed in the PHS terminal 110.
- the voice output unit 210 is composed of a speaker, and converts the voice signal of the call partner received by the PHS terminal 110 into voice and outputs the voice. Further, a ring tone, an operation sound of the operation unit 206, an alarm sound, and the like can be output.
- the wireless communication unit 212 performs wireless communication with the base station 120 in the PHS telephone network.
- the wireless communication system is classified as one of multiplexing systems, and uses a large number of carriers on the unit time axis so that the phase of the signal wave to be modulated is orthogonal between adjacent carriers.
- An OFDM system which is a system that effectively uses frequency bands by partially overlapping carrier wave bands, is employed.
- each part included in the wireless communication unit 212 of the PHS terminal 110 will be described.
- the timing correction channel generation unit 214 generates a channel that is frame-synchronized with a broadcast channel broadcast from the base station 120, which will be described in detail later, and transmits the OFDM symbol to the base station 120.
- the transmission timing of the channel generated immediately before is set by a predetermined shift amount. A new channel having shifted transmission timing is generated and the OFDM symbol is transmitted to the base station 120.
- the terminal memory 202 stores a shift amount when the timing correction channel generation unit 214 shifts the transmission timing once, and a shift direction in the front and rear directions.
- the timing correction channel generation unit 214 serves as a shift storage unit that also stores the total amount of transmission timing shift.
- the transmission timing correction unit 216 stores in the terminal memory 202 so as to eliminate the deviation from the reference timing of the base station 120.
- the transmission timing is corrected by adding the total shift amount of the transmission timing.
- the communication channel allocation request unit 218 transmits a communication channel allocation request to the base station 120 at the corrected transmission timing.
- modulation / demodulation is performed by the OFDM modulation / demodulation unit 220.
- the OFDM modulation / demodulation unit 220 removes the guard interval from the received OFDM symbol and applies FFT, extracts and demodulates the effective symbol, encodes the signal to be transmitted, applies IFFT to make the effective symbol, and An OFDM symbol is generated by inserting a guard interval and transmitted from the wireless communication unit 212.
- the base station 120 includes a base station control unit 300 that controls the entire base station 120 and a radio communication unit 312.
- the wireless communication unit 312 includes a notification unit 314 that notifies the PHS terminal 110 of a notification channel, and an OFDM modulation / demodulation unit 320.
- FIG. 4 is a block diagram showing details of the OFDM modulation / demodulation unit in FIG. Hereinafter, each part included in the OFDM modulation / demodulation unit 320 will be described.
- the symbol synchronization unit 315 performs symbol synchronization with the OFDM symbol transmitted from the PHS terminal 110 via a channel generated by the PHS terminal 110.
- the guard interval removing unit 316 removes the guard interval from the OFDM symbol to obtain an effective symbol (see FIG. 9).
- the FFT unit 317 applies FFT to the effective symbol.
- the timing detection unit 318 detects a correlation peak between an effective symbol and a known ideal symbol.
- the correlation peak determination unit 319 detects the time when the correlation peak is detected only when the correlation peak detected by the timing detection unit 318 is detected within a predetermined timing detection range (FIG. 5) shorter than the effective symbol length.
- a predetermined timing detection range FOG. 5
- a deviation from the reference timing of the base station 120 is recorded in the memory 323 and transferred to the modulation / coding unit 324 to generate a timing correction burst.
- timing detection range is a range shifted inward from both ends of the effective symbol, as shown in FIG.
- the effective symbols that have undergone these processes are demodulated by the demodulation / decoding unit 322.
- the signal to be transmitted is modulated and encoded by the modulation / encoding unit 324, and the IFFT unit 326 applies IFFT to the encoded signal to obtain an effective symbol.
- the guard interval inserting unit 328 inserts the guard interval into the effective symbol to form an OFDM symbol, and transmits the OFDM symbol.
- FIG. 6 is a flowchart for explaining the operation of correcting the transmission timing of the PHS terminal 110.
- the process of the PHS terminal 110 is indicated by “P:”
- the process of the base station is indicated by “base:”.
- a broadcast channel is broadcast from the base station 120 to the PHS terminal 110 (step S400). Then, PHS terminal 110 generates a channel that is frame-synchronized with the broadcast channel and transmits an OFDM symbol to base station 120 (step S402).
- the guard interval removing unit 316 is used to remove the guard interval from the transmitted OFDM symbol to make an effective symbol, and the FFT unit 317 performs FFT processing, and then the timing detecting unit 318 is used. Then, a correlation peak between the effective symbol and the known ideal symbol is detected (step S404).
- the correlation peak determination unit 319 of the base station 120 determines whether or not the correlation peak is detected within a predetermined timing detection range (FIG. 5) shorter than the effective symbol length (step S406). Only when it is detected within the timing detection range, a deviation (FIG. 10) from the reference timing of the base station 120 at the time when the correlation peak is detected is transmitted to the PHS terminal 110 in the timing correction burst (step). S408).
- the timer 213 measures the time after transmitting the OFDM symbol to the base station 120. Then, it is determined whether or not a timing correction burst is received within a predetermined time (step S410). If the timing correction burst does not arrive from the base station 120 even after the predetermined time has elapsed, the channel of the channel generated immediately before is determined. The transmission timing is shifted by a predetermined shift amount (step S412), and the shift amount is added to the existing total shift amount recorded in the terminal memory 202 to calculate a new total shift amount (step S414). . As a result, a new channel having the shifted transmission timing is generated and the OFDM symbol is transmitted again to the base station 120 (step S402), and the processing of the base station 120 is executed again.
- the transmission timing is corrected by adding the total shift amount of the transmission timing (step S416). Then, the communication channel allocation request is transmitted to the base station 120 at the corrected transmission timing (step S418).
- timing detection When timing detection is performed after removing the guard interval and a correlation peak rises between effective symbol lengths to which IFFT is applied, timing detection succeeds and communication channels are allocated even in the conventional method (FIG. 12). ). However, a correlation peak may rise on both sides of the effective symbol length. In this case, an erroneous correlation peak is detected and an error occurs in timing correction. As a result, the communication channel allocation request was not received by the base station, and communication channel allocation failed (FIG. 13).
- the base station 120 provides a predetermined timing detection range, and when correlation peaks appear on the outer side, that is, on both sides of the effective symbol length. Decided not to issue a timing correction burst. No timing correction burst is given to the timing correction channel generated for the first time.
- a timing correction burst is not received after a predetermined time, a new channel whose transmission timing is shifted (Second time) is generated and the OFDM symbol is retransmitted (steps S412, S414, and S402 in FIG. 6). If, as a result of this second transmission, the base station 120 detects a correlation peak within a predetermined timing detection range, a timing correction burst is returned to the PHS terminal 110. As a result, the transmission timing of the PHS terminal 110 is correctly corrected, a communication channel is established, and the possibility that wireless communication is connected increases.
- step S412 In the process of generating a new channel (step S412) in the PHS terminal 110 of FIG. 7, either of two types of channels that are generated alternately with a difference in transmission timing by a predetermined shift amount may be generated. That is, in step S412, channels having two types of transmission timings may be generated alternately.
- the transmission timing of the PHS terminal 110 is returned to the original amount that was shifted immediately before, and the timing detection is expected to succeed while repeating the retransmission. For example, when the PHS terminal 110 cannot receive a timing correction burst from the base station 120 because it has entered a so-called dead point where it cannot happen to establish wireless communication, if the PHS terminal 110 only exits from the dead point, it will eventually Can receive timing correction bursts.
- the channel may be generated with the transmission timing raised or lowered by a predetermined shift amount. That is, the transmission timing may be shifted continuously in one direction, either by raising the timing or by lowering the timing. It is expected that the timing detection succeeds while repeating such processing.
- the total transmission timing shift amount calculated and stored in step S414 is shorter than the effective symbol length (512 samples). This is because timing detection fails when the total transmission timing shift amount becomes longer than the effective symbol length.
- the shift amount of one time must naturally be shorter than the length of the effective symbol (512 samples).
- the total shift amount always satisfies the above condition.
- the number of shifts may be limited so as to satisfy the above condition.
- a communication channel may not be assigned from the base station 120.
- the cause is considered that the base station 120 did not receive the communication channel assignment request because the PHS terminal 110 entered a dead point or the communication power was weak.
- the base station 120 assigns the communication channel to the PHS terminal 110 (step S422). If not received, the base station 120 assigns the communication channel. Do not do.
- the PHS terminal 110 provides a time limit in advance, and if a communication channel is not allocated within the time limit (step S424), the channel generated immediately before An OFDM symbol is transmitted to the base station 120 at the same timing as (second channel) (step S426). Then, the process of the base station 120 (after step S404) is executed again.
- timing correction burst is obtained once by the channel generated immediately before, if the OFMD signal is transmitted at the same timing as the channel, the timing correction burst is obtained immediately without going through the process of shifting the transmission timing. This is because there is a high possibility of being (FIG. 8).
- the present invention relates to a wireless communication method, a wireless communication system, a base station, and a mobile station that perform wireless communication using an OFDM modulation scheme.
Abstract
Description
タイミング補正チャネル生成部214は、後に詳述する基地局120から報知される報知チャネルとフレーム同期するチャネルを生成してOFDMシンボルを基地局120へ送信する。また、送信してからの時間をタイマ213によって計時し、所定時間が経過してもタイミング補正バーストが基地局120から到来しない場合には、直前に生成したチャネルの送信タイミングを所定のシフト量だけシフトした送信タイミングを有する新しいチャネルを生成してOFDMシンボルを基地局120へ送信する。
図3に示すように、基地局120は、基地局120全体を制御する基地局制御部300と、無線通信部312とを含む。無線通信部312は、PHS端末110へ報知チャネルを報知する報知部314と、OFDM変復調部320とを含む。
図6はPHS端末110の送信タイミングを補正する動作を説明するフローチャートである。図6においてPHS端末110の処理は「P:」で示し、基地局の処理は「基:」で示している。
本出願は、2008年1月28日出願の日本特許出願・出願番号2008-016973に基づくものであり、その内容はここに参照として取り込まれる。
Claims (8)
- 移動局と基地局との間でOFDM変調方式を利用して無線通信を行う無線通信方法において、
前記基地局から前記移動局へ報知チャネルを報知し、
前記移動局にて、
前記報知チャネルとフレーム同期するチャネルを生成してOFDMシンボルを前記基地局へ送信し、
前記基地局の処理として、
前記送信されたOFDMシンボルからガードインターバルを除去して有効シンボルとし、該有効シンボルと既知の理想的なシンボルとの相関ピークを検出し、該相関ピークが、有効シンボルの長さより短い所定のタイミング検出範囲内で検出された場合に限り、該相関ピークが検出された時点の、基地局の基準タイミングからのずれを、タイミング補正バーストにて前記移動局に送信し、
前記移動局にて、
前記OFDMシンボルを前記基地局へ送信してから所定時間が経過しても前記タイミング補正バーストが該基地局から到来しない場合には、直前に生成したチャネルの送信タイミングを所定のシフト量だけシフトした送信タイミングを有する新しいチャネルを生成してOFDMシンボルを該基地局へ送信し、前記基地局の処理を再び実行させ、
前記所定時間以内に前記タイミング補正バーストが前記基地局から到来した場合には、前記基地局の基準タイミングからのずれを解消するよう、現時点までの送信タイミングのシフト量の合計を算入して送信タイミングを補正し、
前記補正した送信タイミングにて通信チャネル割当要求を前記基地局に送信することを特徴とする無線通信方法。 - 前記移動局における、新しいチャネルを生成する処理では、前記所定のシフト量だけ送信タイミングに差があり交互に生成される2種類のチャネルのいずれかを生成することを特徴とする請求の範囲1に記載の無線通信方法。
- 前記移動局における、新しいチャネルを生成する処理では、前記所定のシフト量だけ送信タイミングを繰り上げ、または繰り下げたチャネルを生成することを特徴とする請求の範囲1に記載の無線通信方法。
- 前記シフト量の合計は、有効シンボルの長さより短いことを特徴とする請求の範囲1から3のいずれか1項に記載の無線通信方法。
- 前記移動局にて通信チャネル割当要求を前記基地局に送信しても前記基地局から通信チャネルが割り当てられない場合には、直前に生成したチャネルと同じタイミングでOFDMシンボルを該基地局へ送信し、前記基地局の処理を再び実行させることを特徴とする請求の範囲1から4のいずれか1項に記載の無線通信方法。
- 移動局と基地局とを含み、これらがOFDM変調方式を利用して無線通信を行う無線通信システムにおいて、
前記基地局は、
前記移動局へ報知チャネルを報知する報知部と、
前記移動局が生成するチャネルを介して該移動局から送信されたOFDMシンボルからガードインターバルを除去して有効シンボルとするガードインターバル除去部と、
前記有効シンボルと既知の理想的なシンボルとの相関ピークを検出するタイミング検出部と、
前記相関ピークが、有効シンボルの長さより短い所定のタイミング検出範囲内で検出された場合に限り、該相関ピークが検出された時点の、基地局の基準タイミングからのずれを、タイミング補正バーストにて前記移動局に送信する相関ピーク判定部とを含み、
前記移動局は、
前記報知チャネルとフレーム同期するチャネルを生成してOFDMシンボルを前記基地局へ送信し、該送信してから所定時間が経過しても前記タイミング補正バーストが該基地局から到来しない場合には、直前に生成したチャネルの送信タイミングを所定のシフト量だけシフトした送信タイミングを有する新しいチャネルを生成してOFDMシンボルを前記基地局へ送信するタイミング補正チャネル生成部と、
前記タイミング補正チャネル生成部での送信タイミングのシフト量の合計を記憶するシフト記憶部と、
前記所定時間以内に前記タイミング補正バーストが前記基地局から到来した場合には、前記基地局の基準タイミングからのずれを解消するよう、前記記憶部に記憶した送信タイミングのシフト量の合計を算入して送信タイミングを補正する送信タイミング補正部と、
前記補正した送信タイミングにて通信チャネル割当要求を前記基地局に送信する通信チャネル割当要求部とを含むことを特徴とする無線通信システム。 - 移動局とOFDM変調方式を利用して無線通信を行う基地局において、
前記移動局へ報知チャネルを報知する報知部と、
前記移動局が生成するチャネルを介して該移動局から送信されたOFDMシンボルからガードインターバルを除去して有効シンボルとするガードインターバル除去部と、
前記有効シンボルと既知の理想的なシンボルとの相関ピークを検出するタイミング検出部と、
前記相関ピークが、有効シンボルの長さより短い所定のタイミング検出範囲内で検出された場合に限り、該相関ピークが検出された時点の、基地局の基準タイミングからのずれを、タイミング補正バーストにて前記移動局に送信する相関ピーク判定部とを含むことを特徴とする基地局。 - 基地局とOFDM変調方式を利用して無線通信を行う移動局において、
前記基地局から報知される報知チャネルとフレーム同期するチャネルを生成してOFDMシンボルを該基地局へ送信し、該送信してから所定時間が経過してもタイミング補正バーストが該基地局から到来しない場合には、直前に生成したチャネルの送信タイミングを所定のシフト量だけシフトした送信タイミングを有する新しいチャネルを生成してOFDMシンボルを前記基地局へ送信するタイミング補正チャネル生成部と、
前記タイミング補正チャネル生成部での送信タイミングのシフト量の合計を記憶するシフト記憶部と、
前記所定時間以内に前記タイミング補正バーストが前記基地局から到来した場合には、前記基地局の基準タイミングからのずれを解消するよう、前記記憶部に記憶した送信タイミングのシフト量の合計を算入して送信タイミングを補正する送信タイミング補正部と、
前記補正した送信タイミングにて通信チャネル割当要求を前記基地局に送信する通信チャネル割当要求部とを含むことを特徴とする移動局。
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EP09706724A EP2239870A1 (en) | 2008-01-28 | 2009-01-27 | Radio communication method, radio communication system, base station, and mobile station |
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CN101926113A (zh) | 2010-12-22 |
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KR101138927B1 (ko) | 2012-04-25 |
US20110044311A1 (en) | 2011-02-24 |
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JP2009177753A (ja) | 2009-08-06 |
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