WO2009119763A1 - 無線通信システム、無線通信装置および無線通信方法 - Google Patents
無線通信システム、無線通信装置および無線通信方法 Download PDFInfo
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- WO2009119763A1 WO2009119763A1 PCT/JP2009/056176 JP2009056176W WO2009119763A1 WO 2009119763 A1 WO2009119763 A1 WO 2009119763A1 JP 2009056176 W JP2009056176 W JP 2009056176W WO 2009119763 A1 WO2009119763 A1 WO 2009119763A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1825—Adaptation of specific ARQ protocol parameters according to transmission conditions
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1809—Selective-repeat protocols
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
Definitions
- OFDM assigns subchannels for each individual user in a time division manner
- a plurality of users share all subchannels and OFDMA (Orthogonal Frequency) assigns subchannels with the highest transmission efficiency for each user.
- OFDMA Orthogonal Frequency
- ARQ Automatic Repeat reQuest
- the transmitting apparatus performs data retransmission processing on the ARQ in the MAC layer (low layer), it is possible to efficiently compensate for errors in a short control time (Non-Patent Document 2).
- the ARIB STD T95 and the PHS MoU also adopt HARQ (Hybrid ARQ) technology that further improves the efficiency of packet error correction by combining such ARQ and forward error correction (FEC).
- HARQ Hybrid ARQ
- a typical configuration of a wireless communication method includes a first wireless communication device and a second wireless communication device that performs wireless communication with the first wireless communication device.
- the first wireless communication device holds data in units of frames and sequentially transmits the data
- the second wireless communication device receives the transmitted data and receives the received data
- the first radio communication apparatus makes a HARQ retransmission request or an ARQ retransmission request when an error is detected from the data, and the first wireless communication apparatus performs a HARQ retransmission request or an ARQ retransmission.
- a typical example of the first wireless communication device is a base station, and a typical example of the second wireless communication device is a mobile communication terminal. However, the present invention is not limited to this example.
- a mobile phone a notebook personal computer, a PDA (Personal Digital Assistant), a digital camera, a music player, a car navigation system, a portable TV
- PDA Personal Digital Assistant
- a digital camera a music player
- a car navigation system a portable TV
- electronic devices capable of wireless communication such as game devices, DVD players, and remote controllers can also be used as mobile stations.
- the base station wireless communication unit 214 establishes communication with the PHS terminal 110 and transmits / receives data.
- FIG. 3 is an explanatory diagram for explaining a frame in the present embodiment.
- the frame in the present embodiment is a PHY frame, and includes a PHY header, a PHY payload, and a CRC.
- the PHY header includes a frame identifier
- the PHY payload includes a MAC frame.
- the MAC frame includes a MAC payload including a MAC header and data.
- the frame identifier is included in the PHY header and can be referred to in the PHY layer.
- the order number is a number representing the order of data and is included in the MAC header of the MAC frame. Therefore, it cannot be referenced in the PHY layer.
- the retransmission request receiving unit 236 When there is a HARQ retransmission request (NACK) from the PHS terminal 110, the retransmission request receiving unit 236 extracts the frame identifier of the errored data included in the anchor channel (ANCH) and the identifier of the error part, Identify the data and the error part. In addition, when there is an ARQ retransmission request (SREJ) from the PHS terminal 110, the retransmission request receiving unit 236 extracts a sequence number included in a CSCH (Circuit-Switching-Channel) data channel (CDCH) and specifies the data. .
- CSCH Circuit-Switching-Channel
- the HARQ data retransmission unit 238 wirelessly transmits a frame including the data held in the transmission data holding unit 230 specified by the frame identifier included in the HARQ retransmission request. Retransmission is performed at a predetermined frame timing determined by the communication system 100.
- FIG. 4 is a functional block diagram showing a hardware configuration of the PHS terminal 110
- FIG. 5 is a perspective view showing an appearance of the PHS terminal 110.
- the PHS terminal 110 includes a terminal control unit 310, a terminal memory 312, a display unit 314, an operation unit 316, a voice input unit 318, a voice output unit 320, and a terminal wireless communication unit 322. .
- the error detection unit 336 detects an error that could not be corrected by the error correction unit 334.
- the normal retransmission request selection unit 338 is selected by the HARQ processing unit 340 with high packet error correction efficiency. As described above, the anchor channel HC is flagged or the HARQ processing unit 340 is selected a predetermined number of times. In this case, the ARQ processing unit 360 is selected.
- the base station 120 recognizes that the HARQ processing unit 340 has detected no error, that is, is normal. Therefore, since the retransmission request is transmitted only from the ARQ processing unit 360, the base station 120 can retransmit only the data corresponding to the ARQ retransmission request.
- FIG. 6 is an explanatory diagram for explaining the operation of chase synthesis.
- a HARQ retransmission request (NACK) including the error part is transmitted to the base station 120, and the frame in which the error is detected is not discarded.
- the data is stored in the data storage unit 344.
- the PHS terminal 110 combines the retransmission data 550 and the data 552 held in the data storage unit 344 with a maximum ratio combining (MRC: Maximum Ratio Combining). To generate restored data 554.
- MRC Maximum Ratio Combining
- the data deletion unit 354 deletes the data stored in the data storage unit 344 when the error detection unit 336 detects an error and the ARQ processing unit 360 is selected or when the error detection unit 336 does not detect an error.
- the base station 120 holds data in units of frames in the transmission data holding unit 230 in association with frame identifiers and sequence numbers that can identify frames of data, and transmits data, frame identifiers, and order via the data transmission unit 234. Frames containing numbers are transmitted in sequence.
- the data receiver 330 of the PHS terminal 110 receives the frame transmitted by the base station 120 (S400).
- the data demodulator 332 demodulates the frame received in S400 and transfers it to the error corrector 334. If there is an error, the error corrector 334 performs error correction through the cyclic redundancy check bit (CRC) (S402).
- CRC cyclic redundancy check bit
- the frame demodulated in S402 or the frame subjected to error correction is stored in the data storage unit 344 (S404).
- the operation mode setting unit 346 sets the operation mode of the HARQ processing unit 340 to “in HARQ”, and the HARQ transmission unit 348 determines the frame of the data in which the error is detected.
- the HARQ retransmission request (NACK) including the identifier is transmitted to the base station 120 (S410), and the PHY payload transmission unit 350 does not transmit the PHY payload to the ARQ processing unit 360 (S412).
- the PHY payload transmission unit 350 does not transmit the PHY payload to the ARQ processing unit 360, but the operation mode setting unit 346 notifies the “in-HARQ” information to the ARQ processing unit 360 (S414).
- the ARQ processing unit 360 surely confirms that the HARQ processing unit 340 is selected by a configuration that notifies the ARQ processing unit 360 of the fact (in-HARQ information). Can do.
- the ARQ processing unit 360 that holds the “in-HARQ” information does not transmit the ARQ retransmission request to the base station 120, the retransmission request does not overlap.
- the data deletion unit 354 deletes the data stored in the data storage unit 344 in S404 (S424). Also, the HARQ transmission unit 348 transmits ACK to the base station 120 (S426). Further, the PHY payload transmission unit 350 does not transmit the PHY payload demodulated by the data demodulation unit 332 to the ARQ processing unit 360 (S428).
- the ARQ processing unit 360 cannot detect the sequence number because the PHY payload is not transmitted in S428 (the sequence number is lost). As a result, the ARQ transmission unit 370 transmits an ARQ retransmission request (SREJ) including the sequence number to the base station 120 (S436).
- SREJ ARQ retransmission request
- the transmitting apparatus that has transmitted the data receives the retransmission request (HARQ retransmission request) in S504 and the retransmission request (ARQ retransmission request) in S510. Therefore, there is a waste that the receiving apparatus transmits the retransmission request in duplicate, and the transmitting apparatus receives the retransmission request that is the processing result of both (ARQ and HARQ). And waste occurs.
- each step in the wireless communication method of the present specification does not necessarily have to be processed in time series in the order described in the flowchart, and may include processing in parallel or by a subroutine.
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- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
- Detection And Prevention Of Errors In Transmission (AREA)
Abstract
Description
ARIB(Association of Radio Industries and Businesses) STD-T95 A-GN4.00-01-TS Rev.3「Next Generation PHS Specifications」,P331-340
なお、上記の第1の無線通信装置の代表例は基地局であり、第2の無線通信装置の代表例は移動通信端末である。しかしながら、本発明はこの一例に限定されるものではない。
図1は、無線通信システム100の概略的な接続関係を示した説明図である。当該無線通信システム100は、PHS端末110(110A、110B)と、基地局120(120A、120B)と、ISDN(Integrated Services Digital Network)回線、インターネット、専用回線等で構成される通信網130と、中継サーバ140とを含んで構成される。
図2は、基地局120の概略的な構成を示したブロック図である。基地局120は、基地局制御部210と、基地局メモリ212と、基地局無線通信部214と、基地局有線通信部216とを含んで構成される。
図4は、PHS端末110のハードウェア構成を示した機能ブロック図であり、図5は、PHS端末110の外観を示した斜視図である。PHS端末110は、端末制御部310と、端末メモリ312と、表示部314と、操作部316と、音声入力部318と、音声出力部320と、端末無線通信部322とを含んで構成される。
図7は、本実施形態にかかる無線通信方法の処理の流れを示したフローチャートである。図7では理解を容易にするためPHS端末110の処理について示す。
次に、上述したPHS端末110や基地局120を用いて無線通信を行う無線通信方法の比較例としてARQおよびHARQを同時に利用した無線通信方法を説明する。
本出願は、2008年3月26日出願の日本特許出願・出願番号2008-081380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 (6)
- 第1の無線通信装置と、該第1の無線通信装置と無線通信を行う第2の無線通信装置とを備える無線通信システムであって、
前記第1の無線通信装置は、
フレーム単位のデータを保持する送信データ保持部と、
前記データを順次送信するデータ送信部と、
前記第2の無線通信装置から送信されたHARQ再送要求またはARQ再送要求を受信する再送要求受信部と、
前記再送要求受信部がHARQ再送要求を受信した場合、該HARQ再送要求に対応するデータであって前記送信データ保持部に保持されたデータを再送するHARQデータ再送部と、
前記再送要求受信部がARQ再送要求を受信した場合、該ARQ再送要求に対応するデータであって前記送信データ保持部に保持されたデータを再送するARQデータ再送部と、
を備え、
前記第2の無線通信装置は、
前記第1の無線通信装置から送信されたデータを受信するデータ受信部と、
前記受信したデータを復調するデータ復調部と、
前記復調したデータにエラーがあるか否かを検出するエラー検出部と、
HARQ再送要求が可能なHARQ処理部と、
ARQ再送要求が可能なARQ処理部と、
前記エラー検出部がエラーを検出した場合、前記HARQ処理部または前記ARQ処理部のいずれかを選択してHARQ再送要求またはARQ再送要求を行わせる再送要求選択部と、
を備えることを特徴とする無線通信システム。 - 前記HARQ処理部は、
前記再送要求選択部によって当該HARQ処理部またはARQ処理部のいずれが選択されたかに応じて、当該HARQ処理部の動作モードを「HARQ中」または「HARQ放棄」に設定して前記ARQ処理部に通知する動作モード設定部と、
前記設定された動作モードが「HARQ中」の場合、前記HARQ再送要求を前記第1の無線通信装置に送信するHARQ送信部と、
を含み、
前記ARQ処理部は、
前記通知された動作モードを保持する動作モード保持部と、
前記保持された動作モードが「HARQ中」以外の場合、前記ARQ再送要求を前記第1の無線通信装置に送信するARQ送信部と、
を含むことを特徴とする請求項1に記載の無線通信システム。 - 他の無線通信装置と無線通信を行う無線通信装置であって、
前記他の無線通信装置から送信されたフレーム単位のデータを受信するデータ受信部と、
前記受信したデータを復調するデータ復調部と、
前記復調したデータにエラーがあるか否かを検出するエラー検出部と、
HARQ再送要求が可能なHARQ処理部と、
ARQ再送要求が可能なARQ処理部と、
前記エラー検出部がエラーを検出した場合、前記HARQ処理部または前記ARQ処理部のいずれかを選択してHARQ再送要求またはARQ再送要求を行わせる再送要求選択部と、
を備えることを特徴とする無線通信装置。 - 前記HARQ処理部は、
前記再送要求選択部によって当該HARQ処理部またはARQ処理部のいずれが選択されたかに応じて、前記ARQ処理部の動作モードを「HARQ中」または「HARQ放棄」に設定して前記ARQ処理部に通知する動作モード設定部と、
前記設定された動作モードが「HARQ中」の場合、前記HARQ再送要求を前記他の無線通信装置に送信するHARQ送信部と、
を含み、
前記ARQ処理部は、
前記通知された動作モードを保持する動作モード保持部と、
前記保持された動作モードが「HARQ中」以外の場合、前記ARQ再送要求を前記他の無線通信装置に送信するARQ送信部と、
を含むことを特徴とする請求項3に記載の無線通信装置。 - 第1の無線通信装置と、該第1の無線通信装置と無線通信を行う第2の無線通信装置とを用いた無線通信方法であって、
前記第1の無線通信装置は、
フレーム単位のデータを保持し、
前記データを順次送信し、
前記第2の無線通信装置は、
前記送信されたデータを受信し、
前記受信したデータを復調し、
前記復調したデータにエラーがあるか否かを検出し、
前記データからエラーを検出した場合、HARQ再送要求またはARQ再送要求を行い、
前記第1の無線通信装置は、
前記HARQ再送要求または前記ARQ再送要求を受信し、
前記HARQ再送要求を受信した場合、該HARQ再送要求に対応するデータであって前記保持されたデータを再送し、
前記ARQ再送要求を受信した場合、該ARQ再送要求に対応するデータであって前記保持されたデータを再送することを特徴とする無線通信方法。 - 前記第1の無線通信装置は基地局であり、前記第2の無線通信装置は移動通信端末であることを特徴とする請求項1に記載の無線通信システム。
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EP09724340A EP2257098A1 (en) | 2008-03-26 | 2009-03-26 | Radio communication system, radio communication device and radio communication method |
CN2009801105347A CN101981960A (zh) | 2008-03-26 | 2009-03-26 | 无线通信系统、无线通信设备和无线通信方法 |
US12/934,263 US20110022919A1 (en) | 2008-03-26 | 2009-03-26 | Wireless Communication System, Wireless Communication Device and Wireless Communication Method |
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US8276035B1 (en) * | 2008-07-28 | 2012-09-25 | Netmotion Wireless, Inc. | High performance digital communications resiliency in a roamable virtual private network |
US20150033091A1 (en) * | 2013-07-23 | 2015-01-29 | Electronics And Telecommunications Research Institute | Apparatus and method for requesting retransmission of lost packet based on mpeg media transport system |
CN106407041B (zh) * | 2016-09-06 | 2019-12-10 | Oppo广东移动通信有限公司 | 终端跌落数据处理系统 |
CN115315913A (zh) * | 2020-03-26 | 2022-11-08 | 索尼半导体解决方案公司 | 通信装置和通信系统 |
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WO2007145345A1 (ja) * | 2006-06-16 | 2007-12-21 | Fujitsu Limited | 通信方法、送信装置および受信装置 |
JP2008259026A (ja) * | 2007-04-06 | 2008-10-23 | Ntt Docomo Inc | 再送制御方法及び送信側装置 |
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CN101009538B (zh) * | 2006-01-26 | 2011-10-05 | 华为技术有限公司 | 一种数据重传方法及装置 |
KR100827969B1 (ko) * | 2006-02-17 | 2008-05-08 | 삼성전자주식회사 | 광대역 무선접속 통신시스템에서 자동재전송요구 운용 장치및 방법 |
KR100913904B1 (ko) * | 2006-04-14 | 2009-08-26 | 삼성전자주식회사 | 이동통신 시스템에서 자동 재전송 요구를 수행하는 방법 및장치 |
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JP4769834B2 (ja) * | 2008-03-27 | 2011-09-07 | 京セラ株式会社 | 無線通信システム、無線通信装置および無線通信方法 |
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- 2009-03-26 CN CN2009801105347A patent/CN101981960A/zh active Pending
- 2009-03-26 US US12/934,263 patent/US20110022919A1/en not_active Abandoned
- 2009-03-26 KR KR1020107021199A patent/KR20100116225A/ko not_active Application Discontinuation
Patent Citations (3)
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JPH0646037A (ja) * | 1992-03-24 | 1994-02-18 | Idou Tsushin Syst Kaihatsu Kk | モード切替えarq方式 |
WO2007145345A1 (ja) * | 2006-06-16 | 2007-12-21 | Fujitsu Limited | 通信方法、送信装置および受信装置 |
JP2008259026A (ja) * | 2007-04-06 | 2008-10-23 | Ntt Docomo Inc | 再送制御方法及び送信側装置 |
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JP4917563B2 (ja) | 2012-04-18 |
KR20100116225A (ko) | 2010-10-29 |
EP2257098A1 (en) | 2010-12-01 |
CN101981960A (zh) | 2011-02-23 |
JP2009239502A (ja) | 2009-10-15 |
US20110022919A1 (en) | 2011-01-27 |
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