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WO2003030438A1 - Procede de retransmission de donnees dans la couche de commande d'acces grande vitesse au support - Google Patents

Procede de retransmission de donnees dans la couche de commande d'acces grande vitesse au support Download PDF

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Publication number
WO2003030438A1
WO2003030438A1 PCT/CN2002/000201 CN0200201W WO03030438A1 WO 2003030438 A1 WO2003030438 A1 WO 2003030438A1 CN 0200201 W CN0200201 W CN 0200201W WO 03030438 A1 WO03030438 A1 WO 03030438A1
Authority
WO
WIPO (PCT)
Prior art keywords
retransmission
data
pdu data
pdu
control layer
Prior art date
Application number
PCT/CN2002/000201
Other languages
English (en)
Chinese (zh)
Inventor
Zhentao Chi
Original Assignee
Huawei Technologies Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2003030438A1 publication Critical patent/WO2003030438A1/fr

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Classifications

    • 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
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1887—Scheduling and prioritising arrangements
    • 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
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/188—Time-out mechanisms
    • 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
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
    • 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
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding

Definitions

  • the present invention relates to data layered retransmission technology in the field of wireless communications, and in particular, to a method for implementing data retransmission added in a high-speed media access control layer (MAC-HS).
  • MAC-HS media access control layer
  • High Speed Downlink Packet Access (HSDPA for short) is proposed, which includes Adaptive Modulation and Coding (AMC) and hybrid automatic retransmission.
  • AMC Adaptive Modulation and Coding
  • Request technology Hybrid Auto Retransmit Request, HARQ for short.
  • the core of AMC technology is to select a suitable modulation and coding method according to the change of channel conditions.
  • MCS Modulation and Coding Scheme
  • 64QAM 64 amplitude and phase combined modulation
  • code rate 3/4
  • TURBO CODE TURBO CODE
  • TTI data blocks refer to data transmitted at a transmission time interval (TI).
  • TI transmission time interval
  • the receiver finds an error during decoding, it asks the sender to retransmit the erroneous data, which is faster than requiring retransmission at a higher layer.
  • RLC radio link control layer
  • MAC-HS high-speed media access control layer
  • PHY physical layer
  • HARQ data retransmission is implemented at the physical layer, and scheduling is implemented in MAC-HS.
  • Data retransmission scheduling is implemented in the following way: 1.
  • the protocol data unit (PDU) data divided by the radio link control layer (RLC) is scheduled by the high-speed media access control layer (MAC-HS), and is encapsulated into TTI data blocks at the physical layer according to the MCS code at the time of transmission;
  • PDU protocol data unit
  • RLC radio link control layer
  • MAC-HS high-speed media access control layer
  • the physical layer uses the HARQ mechanism to transmit the TTI data block.
  • the TTI data block is retransmitted. If the maximum number of retransmissions is exceeded, the TTI data is discarded.
  • the RLC layer of the receiver sends a retransmission request that the data is not received correctly, and the RLC layer of the sender resends the PDU data that was not received correctly.
  • the analysis of the above-mentioned prior art data retransmission scheme can be seen to have the following problems:
  • the time delay for retransmitting data is too large:
  • the RLC layer of the sender is implemented in a radio network controller (RNC), and the MAC-HS is implemented in a base station (Node B), the transmission delay of PDU data from RLC to MAC-HS is 100 milliseconds (ms), and the time interval (TTI) for one data transmission in HSDPA is 2ms. Therefore, the retransmission data initiated by the RLC peer entity layer
  • the time delay is very large, which directly affects the data transmission speed.
  • HARQ retransmission is implemented in the physical layer (PHY), which is the retransmission of TTI data blocks after encoding multiple PDU data.
  • PHY physical layer
  • the MCS encoding information of the data blocks is being retransmitted. Time is constant, so it cannot adapt to the situation where the channel condition changes from good to bad. In this case, even if the number of HARQ retransmissions is continuously increased, the possibility of retransmission failure is also high.
  • An object of the present invention is to provide a method for implementing retransmission of PDU data at a high-speed media access control layer to improve data retransmission performance in high-speed transmission.
  • a method for implementing data retransmission in a high-speed media access control layer of the present invention is applied to In a data retransmission mechanism composed of a wireless link control layer, a high-speed media access control layer, and a physical layer, the method includes at least the following steps:
  • the physical layer retransmission scheduling includes at least:
  • the PDU data retransmission scheduling includes at least:
  • the PDU data in the queue is preferentially scheduled, and an appropriate modulation and coding mode is selected and re-encoded and transmitted at the physical layer according to the current channel status;
  • the PDU data retransmission scheduling further includes:
  • PDU data retransmission scheduling counter When PDU data in the retransmission PDU data queue is scheduled to be resent, first determine whether the PDU data retransmission scheduling count value is greater than The maximum retransmission times set first;
  • the PDU data is scheduled to be resent, and the PDU data retransmission scheduling count value is increased by 1;
  • the radio link control layer is reported, and the radio link control layer initiates retransmission.
  • the physical layer adopts a hybrid automatic repeat request (HARQ) technology for TTI data block transmission
  • HARQ hybrid automatic repeat request
  • the invention introduces a data retransmission mechanism composed of a wireless link control layer, a high-speed media access control layer, and a physical layer in a high-speed data service, and introduces a physical layer hybrid automatic repeat request technology (HARQ) and automatic modulation and coding.
  • AMC advanced technology
  • coordinated scheduling of physical layer retransmission and PDU data retransmission is realized at the high-speed media access control layer, and the MCS coding of retransmitted PDU data can be adjusted in time according to the channel condition, which reduces the data retransmission.
  • the delay also improves the adaptability to the channel conditions, enhances the reliability of data retransmission, improves the data transmission speed and throughput performance of the system, thereby further improving the overall performance of the system.
  • FIG. 1 is a schematic diagram of a communication protocol layer related to a data retransmission scheduling mechanism
  • Figure 2 is a schematic block diagram of PDU data retransmission at the high-speed media access control layer
  • Figure 3 is a schematic diagram of the physical layer retransmission and PDU data retransmission scheduling flow of the high-speed media access control layer.
  • the communication protocol layers related to the data retransmission scheduling mechanism are a radio link control layer (RLC), a high-speed media access control layer (MAC-HS), and a physical layer (PHY).
  • RLC radio link control layer
  • MAC-HS high-speed media access control layer
  • PHY physical layer
  • the invention adds a retransmission PDU data queue at the high-speed media access control layer (MAC-HS), and is used to store PDU data corresponding to a ⁇ data block whose physical layer (PHY) exceeds the maximum HARQ retransmission times.
  • MAC-HS media access control layer
  • the MAC-HS implements scheduling for the PDU data stored in the queue and the TTI data stored in the physical layer without successful transmission but without exceeding the HARQ maximum retransmission times.
  • the MAC-HS After receiving the retransmission request from the receiver, the MAC-HS first checks the retransmission TTI data queue in the physical layer. When the number of times of retransmission of the TTI data block is not greater than the maximum number of retransmissions, it is scheduled to retransmit at the physical layer. After the number of block retransmissions reaches the maximum number of retransmissions, the PDU data in the TTI data block is returned to the high-speed media access control layer MAC-HS retransmission PDU data queue.
  • the PDU data stored in the retransmission PDU data queue is rescheduled and sent to the physical layer to make a new MCS selection according to the new channel conditions.
  • the most appropriate modulation and coding method is selected to re-encode the modulation to form a new TTI data block to send. In this way, the retransmission of PDU data at the MAC-HS layer and the scheduling of the two-layer retransmission are realized.
  • the combination of increased data retransmission and physical layer retransmission using MAC-HS can choose a smaller maximum number of HARQ retransmissions, and the use of MAC-HS data retransmission can increase the adaptive performance to the channel.
  • the MCS information in the HARQ retransmission is unchanged. In the case that the channel condition is deteriorated or the AMC selects the MCS coding error, the success rate of the HARQ retransmission is very low.
  • MAC-HS number According to the retransmission, the PDU data that failed to retransmit is re-modulated and encoded to adapt to the change of the channel, and the probability of successful transmission is much greater.
  • the PDU data contained in the HARQ retransmission failed TTI data must be the PDU data with a smaller sequence number required for the receiver's RLC reassembly. It is necessary to retransmit these data at the MAC-HS layer as soon as possible. This method can be used to achieve these. Priority scheduling of data packets reduces the time delay for retransmission of these PDU data from the RLC.
  • the present invention provides a method for implementing retransmission of PDU data at the MAC-HS layer, which can combine changes in channel conditions and the HARQ mechanism, and has the following advantages:

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)

Abstract

L'invention concerne un procédé de retransmission de données PDU dans une couche de commande d'accès grande vitesse au support (MAC-HS). Les files d'attente sont établies dans la couche MAC-HS, pour le stockage de données PDU correspondant aux blocs de données TTL n'ayant pas encore été transmis avec succès dans une demande de retransmission automatique hybride (HARQ) dans la couche physique (PHY) ; l'ordonnancement de la retransmission de données PDU est ajouté dans la couche MAC-HS et est réalisé pour la retransmission de données PDU, et des blocs de données TTI stockés dans la couche PHY qui n'ont pas été transmis avec succès dans les délais de retransmissions maximum (HARQ). Les paquets de données PDU qui n'ont pas été transmis avec succès au delà des délais de retransmission maximum sont renvoyés et stockés dans les files d'attente de données PDU. Les données PDU se trouvant dans les queues de données PDU sont ordonnancées préalablement dans la couche MAC-HS, modulées, codées et envoyées en fonction des nouveaux états des voies dans la couche PHY. Ledit procédé permet de réduire le retard de retransmission de données, d'augmenter la qualité adaptée à l'état de la voie, d'augmenter la fiabilité de la retransmission, et d'améliorer ainsi la vitesse de transmission de données et le débit dans le système.
PCT/CN2002/000201 2001-09-29 2002-03-27 Procede de retransmission de donnees dans la couche de commande d'acces grande vitesse au support WO2003030438A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN 01141645 CN1225875C (zh) 2001-09-29 2001-09-29 在高速媒体接入控制层实现数据重传的方法
CN01141645.9 2001-09-29

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WO2003030438A1 true WO2003030438A1 (fr) 2003-04-10

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US7965639B2 (en) 2005-03-14 2011-06-21 Sharp Laboratories Of America, Inc. Dynamic adaptation of MAC-layer retransmission value
US8805354B2 (en) 2004-05-07 2014-08-12 Interdigital Technology Corporation Medium access control layer architecture for supporting enhanced uplink
US20140281781A1 (en) * 2004-06-10 2014-09-18 Interdigital Technology Corporation Method and apparatus for dynamically adjusting data transmission parameters and controlling h-arq processes
RU2754680C1 (ru) * 2017-11-27 2021-09-06 Телефонактиеболагет Лм Эрикссон (Пабл) Системы и способы связи между мас-уровнем и физическим уровнем для передач

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US8805354B2 (en) 2004-05-07 2014-08-12 Interdigital Technology Corporation Medium access control layer architecture for supporting enhanced uplink
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RU2754680C1 (ru) * 2017-11-27 2021-09-06 Телефонактиеболагет Лм Эрикссон (Пабл) Системы и способы связи между мас-уровнем и физическим уровнем для передач
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