WO2007025454A1 - Methode et systeme de retransmission de donnees avec abaissement de couche dans une communication sans fil - Google Patents

Methode et systeme de retransmission de donnees avec abaissement de couche dans une communication sans fil Download PDF

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Publication number
WO2007025454A1
WO2007025454A1 PCT/CN2006/002040 CN2006002040W WO2007025454A1 WO 2007025454 A1 WO2007025454 A1 WO 2007025454A1 CN 2006002040 W CN2006002040 W CN 2006002040W WO 2007025454 A1 WO2007025454 A1 WO 2007025454A1
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Prior art keywords
layer
mac
rlc
retransmission
base station
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PCT/CN2006/002040
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English (en)
Chinese (zh)
Inventor
Yali Qin
Rongqiang Li
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Huawei Technologies Co., Ltd.
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Publication of WO2007025454A1 publication Critical patent/WO2007025454A1/fr

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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
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1874—Buffer management

Definitions

  • the present invention relates to the field of wireless communication technologies, and in particular, to a wireless communication downlink data retransmission method and system. Background technique
  • WCDMA Wideband Code Division Multiple Access
  • ITU International Telecommunications Union
  • FDD Frequency Division Duplex
  • WCDMA is a CDMA system using Direct Sequence Spread Spectrum (DSSS) technology, which spreads the user bandwidth to more than 1000 times by spreading codes and expands the channel bandwidth to 5 MHz. This allows reliable transmission of information at the same transmission rate with very low signal-to-noise ratio. It greatly enhances anti-jamming capability and implements code division multiple access, which can support various user data rates.
  • DSSS Direct Sequence Spread Spectrum
  • the earliest version of WCDMA protocol is R99.
  • the bearers of uplink and downlink services are based on dedicated channels, and the data transmission rate that can be achieved is 384Kbps.
  • the WCDMA standard-setting organization subsequently introduced the network protocols of three phases: R4, R5, and R6, and introduced high-speed downlink packet access (HSDPA, High Speed Downlink Packet Access).
  • HSDPA High Speed Downlink Packet Access
  • Technology and High Speed Uplink Packet Access (HSUPA) technology can provide peak rates of up to 14.4Mbps and 5.76Mbps, respectively, while greatly improving spectrum efficiency.
  • HSDPA High-order modulation is introduced to improve the spectrum utilization, and the shared channel scheduling of each user equipment (UE, User Equipment) is implemented by code division and time division.
  • the HARQ technology requires the base station node (NodeB) to send the data to the UE, and needs to obtain the response data of the UE feedback acknowledgement ACK (acknowledgement) / NACK (no acknowledgement) to determine whether the UE has correctly received the data, so as to determine the number of retransmissions. According to the new data.
  • NodeB base station node
  • ACK acknowledgement
  • NACK no acknowledgement
  • HSDPA adds two physical channels in the downlink, one is the High Speed Physical Downlink Shared Channel (HS-PDSCH), which is used to carry the user's data information, and the other is the high-speed shared control channel (HS-SCCH). , High Speed Shared Control Channel), used to carry the signaling required to demodulate the accompanying data channel HS-PDSCH.
  • HSDPA adds a High Speed-Dedicated Physical Control Channel (HS-DPCCH) to the uplink, which is used to carry the feedback downlink data frame through the high-speed physical downlink shared channel (HS-PDSCH, High Speed Physical).
  • HS-DPCCH High Speed-Dedicated Physical Control Channel
  • the Medium Access Control (high-speed access control) (MAC-hs, Medium Access Control-high speed) sub-layer is added to support the flow control of HSDPA, fast scheduling/priority management, HARQ.
  • MAC-hs Medium Access Control-high speed sub-layer
  • TFRI Transport Format and Resource Indicator
  • the MAC-hs is located under the MAC-d (d refers to dedicated) of the MAC layer, above the physical layer.
  • HSUPA in the R6 version, requires two new uplink physical channels for the user, one is the enhanced dedicated physical data channel (E - DPDCH, Enhanced - Dedicated Physical Data Channel) for transmitting data, and the other is transmission accompanying Enhanced Layer-Dedicated Physical Control Channel (E-DPCCH), which provides accompanying signaling for the former demodulation.
  • E- DPDCH enhanced dedicated physical data channel
  • E-DPCCH Enhanced Layer-Dedicated Physical Control Channel
  • the absolute channel E-AGCH, Enhance - Absolute Granted Channel
  • E-RGCH Enhanced Grant Channel
  • the cell exists to indicate that the user can transmit the maximum transmission rate in the uplink, and the adjusted frequency is relatively low.
  • the relative authorization channel may exist in both the serving wireless connection and the non-serving wireless connection cell, and is used to indicate that the user adjusts the uplink according to a certain step. Transmission rate, the frequency of adjustment is relatively high, up to every 2ms-times.
  • a channel indicating whether the uplink process data transmission is correct is also added in the downlink channel, and is used to tell the user whether the data sent is correct.
  • MAC-e refers to enhancement
  • MAC-es are introduced in the MAC layer to support HARQ and fast scheduling.
  • the MAC-e protocol data unit can be utilized. (MAC-e Protocol Data Unit) carries the signaling and reads this signaling at the MAC-e layer of the base station.
  • signaling MAC-es PDUs may be multiplexed, that is, multiple MAC-es PDUs are integrated into MAC-e PDUs.
  • MAC-e and MAC-es are between the physical layer and MAC-d.
  • E-DCH enhanced dedicated channel
  • UTRAN Universal Terrestrial Radio Access
  • data from the physical layer is sorted according to the number of retransmissions and decomposed into different MAC-d flows.
  • the structure of the WCDMA protocol is shown in Figure 1. Above the physical layer, it is the Medium Access Control (MAC) layer, the Radio Link Control (RLC) layer, and other high layers.
  • MAC Medium Access Control
  • RLC Radio Link Control
  • AM Acknowledged Mode
  • the HARQ transmission error of the physical layer is prevented, and the RLC layer of the receiving end is received.
  • the RLC layer retransmission is requested according to the sequence number status of the received RLC Protocol Data Unit (PDU), and the RLC layer receiving the request at the transmitting end initiates the RLC layer retransmission. That is to say, when the physical layer retransmission fails, the system needs to start the RLC layer, and even the higher layer retransmission.
  • PDU RLC Protocol Data Unit
  • the physical layer and part of the MAC layer are located in the base station, and the RLC layer and above are located in the Radio Network Controller (RNC), and there is a standard interface between the base station and the radio network controller.
  • RLC Radio Network Controller
  • the RLC layer In the AM mode, if the physical layer cannot correct the transmission error of the data by retransmission, the RLC layer needs to initiate retransmission to ensure the correct transmission of the service data.
  • the RLC layer retransmission process of the downlink transmission is: 1) At the UTRAN end, the RLC layer transmits the RLC service data unit from the upper layer. (SDU, Service Data Unit) Segmentation or merging generates equal-sized RLC AMD PDUs (acknowledgement mode RLC PDUs). The size of the RLC AMD PDU is determined by the parameter AMD RLC size (the RLC size in the acknowledge mode). The resulting AMD PDU is placed in the retransmitted buffer for transmission.
  • SDU Service Data Unit
  • the MAC layer will receive the MAC PDU and remove the data header of the MAC layer to obtain the PDU of the RLC layer and transmit it to the RLC layer.
  • the sequence number of the AMD PDU is used to confirm whether the LC AMD PDU is correctly received. If received correctly, an acknowledgment message is sent to the peer UTRAN RLC layer. If retransmission is not received correctly, the message requesting retransmission is sent to the peer UTRAN RLC layer.
  • the RLC layer performs different operations according to the received UE acknowledgement information or retransmission request. If an acknowledgment is received, the RLC AMD PDU is no longer sent and the data cache of the RLC AMD PDU is flushed. If the retransmission request is received, and the number of retransmissions of the RLC layer is not exceeded, the retransmitted RLC AMD PDU is placed in the retransmission buffer for transmission, and the data block is retransmitted to the base station, and the physical channel of the base station Beared to the UE.
  • the transmitting end can parse the receiving feedback information of the receiving end at the RLC layer.
  • the downlink RLC layer retransmission is performed, and the UE first stores the received RLC AMD PDU in the received RLC cache area until all RLC AMD PDUs corresponding to a complete RLG SDU are received.
  • the RLC layer determines whether all RLC AMD PDUs corresponding to the RLC SDU are correctly received by the sequence number of the RLC AMD PDU. If the RLC AMD PDU is lost, the retransmission indication sent by the UE sender requests retransmission.
  • the content of the retransmission indication sent by the UE is analyzed, and it is determined whether the RLC AMD PDU needs to be retransmitted.
  • This process requires the Iub/Iur interface to pass information, so it takes a long time. Since the RLC is in the RNC, the retransmission of the RLC involves R C processing, base station processing, and data transmission between the two. Excessive intermediate processing also results in extended transmission time.
  • the RLC layer of the UTRAN does not receive the number fed back by the UE peer-to-peer RLC layer According to the status report that has been correctly received, it is necessary to retain the data at the RLC layer. For the high-speed data service flow, it is easy to cause the RNC's cache resources to be tight and affect its processing capability.
  • the main object of the present invention is to provide a downlink data retransmission method in a wireless communication system, so that the retransmission time is greatly reduced, the buffer amount of the data packet on the RNC side is greatly reduced, and the processing capability of the RNC is improved.
  • a method for retransmitting a wireless communication downlink data includes the following steps: the base station sends the downlink data packet to the user equipment after being buffered in the specified layer;
  • the UE generates a retransmission indication according to the check result of the correctness of the received data packet at the radio link control RLC layer, and the UE multiplexes the retransmission indication to the protocol data unit of the designated layer at the designated layer, and Sending to the base station;
  • the base station After receiving the protocol data unit, the base station decrypts the retransmission indication, and the specified layer refreshes the specified layer cache according to the retransmission indication and the data packet that is not correctly transmitted in the cache Resending to the client;
  • the base station and the user end both include the designated layer, and the user end has a function of multiplexing upper layer signaling to the designated layer uplink protocol data unit at a specified layer, and the base station has a corresponding demultiplexing function at a specified layer. .
  • the designated layer is a MAC layer
  • the RLC layer sends data to the specified layer and checks the correctness of the received packets.
  • the MAC-e sublayer in the MAC layer implements a function of multiplexing and demultiplexing retransmission indication.
  • the downlink data packet is an RLC acknowledgment mode protocol data unit, and the MAC encapsulates the RLC acknowledgment mode protocol data unit into a MAC-d protocol data unit, where the RLC acknowledges the mode protocol data unit and the MAC-d protocol data unit— - correspondence;
  • the retransmission indication may include one of the following information or any combination thereof:
  • Confirmation information movement of the downlink RLC acknowledgment mode protocol data unit that has been correctly received
  • the receive window acknowledgement information the list information of the RLC acknowledge mode protocol data unit that was not correctly received
  • the relative list information of the RLC acknowledge mode protocol data unit that was not correctly received The receive window acknowledgement information, the list information of the RLC acknowledge mode protocol data unit that was not correctly received, and the relative list information of the RLC acknowledge mode protocol data unit that was not correctly received.
  • the MAC-e protocol data unit is carried on an uplink dedicated enhanced data channel for high speed uplink packet access.
  • the data packet in the MAC layer cache is confirmed to be correctly received or the number of failed retransmissions reaches a preset threshold, and is to be transmitted.
  • the data packet is a data packet carrying a real-time service.
  • the retransmission data is high speed downlink packet access data.
  • the wireless communication system is one of a wideband code division multiple access system, an orthogonal frequency division multiplexing system, a multiple input multiple output system, and an evolved system thereof.
  • a wireless communication downlink data retransmission system having a base station and a user terminal, including:
  • a storage unit that caches downlink data packets in the base station at the designated layer
  • an update and retransmission unit configured in the base station, refreshing, in the specified layer, the data packet in the storage unit according to the retransmission indication, and resending the data packet that is not correctly transmitted to the user terminal;
  • the user terminal retransmits the multiplex protocol data unit at the designated layer; the user terminal generates a retransmission indication according to the check result of the correctness of the received data packet at the radio link control RLC layer, and sends the retransmission indication to the base station;
  • the base station and the user terminal both include the designated layer, and the user terminal has the upper layer signaling multiplexed to the designated layer uplink protocol data unit at the designated layer, and the base station performs corresponding demultiplexing at the designated layer.
  • the designated layer is a medium access control MAC layer.
  • the downlink data packet is a radio link control RLC acknowledge mode protocol data unit
  • the MAC buffers the RLC acknowledge mode protocol data unit into a MAC_d protocol data unit, wherein the RLC acknowledge mode protocol data unit corresponds to the MAC-d protocol data unit.
  • the retransmission indication includes one of the following information or any combination thereof:
  • Confirmation information movement of the downlink RLC acknowledgment mode protocol data unit that has been correctly received
  • the receive window acknowledgement information the list information of the RLC acknowledge mode protocol data unit that was not correctly received
  • the relative list information of the RLC acknowledge mode protocol data unit that was not correctly received The receive window acknowledgement information, the list information of the RLC acknowledge mode protocol data unit that was not correctly received, and the relative list information of the RLC acknowledge mode protocol data unit that was not correctly received.
  • the retransmission function of the RLC layer originally implemented in the RNC is moved down to the MAC layer in the base station, and the user equipment is carried by the MAC-e PDU of the HSUPA. Feedback retransmission indication.
  • the base station sends the downlink data packet from the RLC layer to the user equipment after being buffered by the MAC layer, and the MAC-e sublayer of the user equipment multiplexes the retransmission indication in the MAC-e PDU to the base station, and the MAC-e sublayer of the base station
  • the retransmission indication is resolved from the MAC-e PDU and the MAC layer buffer is refreshed accordingly and the erroneous data packet is retransmitted.
  • the retransmission speed is greatly accelerated, and the efficiency is obviously improved.
  • the path involved in the entire retransmission process is shortened.
  • both ends of the retransmission path are the RNC and the UE, and the intermediate station is transited through the base station.
  • the two ends of the path are the base station and the UE.
  • the retransmission time is greatly saved, the delay of the downlink transmission is greatly reduced, the QoS guarantee for the service quality of the delay sensitive service is facilitated, the user satisfaction is improved, and the problems of sound lag and image discontinuity can be reduced or eliminated.
  • the RLC layer buffer on the RNC side can be cancelled.
  • the RLC layer retransmission mechanism in the prior art leads to a relatively large RLC layer buffer of the RNC, which may cause the RNC cache resource to be tight for carrying a high-speed data service flow. Because if the RLC layer of the RNC does not receive the status report that the peer UE's RLC layer feedback data has been correctly received, the data will be retained. Under the high speed data service, the RC cache resource is tight and the processing capability is limited. . If the retransmission function of the RLC layer is implemented in the base station, the AMD PDU data buffer of the RLC layer can be released and replaced by the cache in the base station.
  • the base station can quickly obtain the information that the AMD PDU is correctly received, so that the correct data block buffer can be quickly released, so that the amount of data corresponding to the AMD PDU that the base station actually needs to be cached is greatly reduced, so that the overall processing capability of the UTRAN can be improved. cut costs.
  • the technical solution of the present invention simplifies the protocol architecture. Because the "RLC layer retransmission" function is implemented in the base station, the UTRAN side only needs to perform retransmission of the physical layer, so the protocol architecture can be compressed. At the same time, the base station implements the "RLC layer retransmission" function, which reduces the data retransmission between the base station and the RNC. Bandwidth consumption is brought about, and the effective utilization of the Iub interface is improved.
  • the technical solution of the present invention can carry real-time services. Since the transmission delay is greatly reduced after using the scheme of the present invention, the existing unacknowledged mode bearer service can be changed to be carried by the acknowledge mode, such as real-time service. By confirming the mode bearer, the transmission reliability of these services can be greatly improved.
  • FIG. 2 is a structural diagram of an RLC AMD PDU
  • FIG. 3 is a schematic diagram of a process of multiplexing a retransmission indication to a MAC-e PDU and a MAC-e PDU by a UE side in a preferred embodiment of the present invention
  • FIG. 4 is a schematic diagram of an ACK SUFI structure in a retransmission indication in a preferred embodiment of the present invention
  • FIG. 5 is a schematic diagram of a process of deactivating a MAC-e PDU transmitted by a UE in a preferred embodiment of the present invention
  • FIG. 6 is a flow chart of a method for HARQ retransmission in accordance with a preferred embodiment of the present invention
  • FIG. 7 is a block diagram showing the structure of a downlink data retransmission system in accordance with a preferred embodiment of the present invention. detailed description
  • the core of the present invention is that the retransmission of the RLC layer is moved down to the base station, so that the data retransmission time is close to the data transmission delay of the air interface, thereby greatly reducing the retransmission time and achieving the requirement of carrying real-time services.
  • the retransmission of the RLC layer is reduced, so that the data packets buffered on the RNC side are greatly reduced, the RNC cache resources are saved, and the processing capability of the RNC is improved.
  • a MAC buffer for storing a MAC-d PDU is set up in the base station, and retransmission data in the RLC layer is stored in a MAC buffer in the base station.
  • the data in the MAC buffer is then transmitted to the UE through the physical layer and the air interface.
  • the UE processes the received data through the physical layer and the MAC layer, and then transmits the data to the RLC layer.
  • the LC layer determines whether the data sent from the base station is correctly received, and generates a retransmission indication, which is transmitted to the MAC-e layer of the UE.
  • the MAC-e layer of the UE multiplexes the data and retransmission indication from the RLC layer into MAC-e PDUs, through the physical layer. And the air interface is sent to the base station.
  • the base station transmits the received data to the MAC-e layer of the base station after being processed by the physical layer, and then demultiplexes the data by the MAC-e layer to obtain a retransmission indication of the UE, and determines which are retransmitted by the content of the retransmission indication.
  • the data has been received correctly by the UE and which data needs to be retransmitted.
  • the data that has been correctly received in the cache is updated to new data.
  • the base station initiates an air interface fast retransmission of the data through the downlink HSDPA, and simultaneously retains the data in the buffer until the UE has received the correct reception.
  • the data packet is updated to a new data packet to be transmitted.
  • An embodiment of the present invention is a data retransmission applied to HSDPA in a WCDMA system, see Figure 6.
  • the UTRAN side sets up a MAC buffer for storing the MAC-d PDU in the base station, and stores the retransmission data in the RLC layer into the MAC cache in the base station. Since the data packet stored in the RLC is an RLC AMD PDU, the MAC address in the base station must first encapsulate the RLC AMD PDU into a MAC-d PDU and buffer it. In this embodiment, the RLC AMD PDU and the MAC-d PDU are - Corresponding relationship. A person skilled in the art can understand that the PDU of the RLC layer and the buffered PDU can also be in a one-to-many or many-to-one relationship, and the processing method does not deviate from the spirit of the present invention.
  • the uplink data is transmitted to the RNC side to obtain the RLC layer and higher layer processing, and the information interaction between the RNC and the base station needs to pass through the Iub/ The Iur interface, therefore, if the retransmitted data does not need to be transmitted to the base station through the RC having the RLC layer, and then sent by the base station to the UE through the physical layer and the air interface, but directly transmitted by the base station to the UE, the transmission delay can be reduced.
  • Step 620 After the UTRAN side buffers the retransmission data in the RLC layer to the MAC layer in the base station, the base station transmits the retransmission data to the physical layer, and the physical layer sends the data to the UE through the air interface.
  • Step 630 The RLC layer of the UE checks the correctness of the data packet and generates a retransmission indication. After receiving the data packet sent by the base station on the UTRAN side, the UE is at the RLC layer for the data packet. Check for correctness. Since the data packet received at the RLC layer is an RLC AMD PDU, the structure of the RLC AMD PDU is as shown in FIG. 2, and the transport sequence number carried therein indicates the order of data packet transmission. Therefore, in the RLC, the correctness of the data packet transmission can be checked according to the transmission sequence number of the received RLC AMD PDU. After checking the data packet, the RLC layer generates a retransmission indication indicating which data has been correctly received and which data needs to be retransmitted by the base station on the UTRAN side.
  • the retransmission indication (also referred to as a STATUS message) is similar to the definition and content of the STATUS PDU in the RLC in the existing system, and may include, but is not limited to, the following:
  • ACK SUFI Positive acknowledgement information of the received AMD PDU
  • MMW SUFI-ACK mobile reception window acknowledgement information
  • the Relative List information ( Relative LIST SUFI) of the AMD PDU that was not received correctly.
  • the format of the acknowledgement information of the downlink RLC AMD PDU that has been correctly received is as shown in FIG. 4, and the LSN indicates the last transmission sequence number, which is used to indicate that the data of the transmission sequence number of the RLC AMD PDU before the LSN has been correctly received.
  • the List (list) information of the RLC AMD PDU that is not correctly received and the Relative List information of the RLC AMD PDU that is not correctly received indicate that the RLC AMD PDU is not correctly received, and the first information is given in the List information.
  • the UE In step 640, the UE generates a MAC-e PDU and transmits it.
  • the MAC-e sub-layer of the UE multiplexes the retransmission indication generated by the RLC in step 630 into the MAC-e PDU, and then transmits the retransmission indication to the base station through the E-DPCH of the HSUPA.
  • the process of generating the retransmission indication to the MAC-e PDU and the MAC-e PDU is as shown in FIG. 3.
  • a retransmission indication is added to indicate that the RLC layer of the UE side correctly receives the RLC AMD PDU.
  • a data block MAC-e PDU transmitted in the E-DPCHCH is generated.
  • DDI Data Description Indicator
  • a special value is added to the DDI for the corresponding retransmission indication, indicating that the corresponding MAC-es PDU is the RLC layer receiving status confirmation information.
  • Step 650 After receiving the MAC-e PDU sent by the UE, the base station on the UTRAN side resolves the retransmission indication in the MAC-e PDU. Since the UE multiplexes the retransmission indication in the MAC-e PDU, the base station on the UTRAN side can resolve the retransmission indication in the MAC-e PDU by performing a demultiplexing process as shown in FIG. 5. And obtaining, according to the acknowledgement information of the downlink RLC AMD PDU that has been correctly received in the retransmission indication, the UE receiving the RLC AMD PDU.
  • Step 660 The MAC layer in the base station refreshes the MAC layer cache according to the retransmission instruction that is solved in step 650, and retransmits the data packet that is not correctly transmitted in the buffer to the user equipment. Since in step 650, the base station can already know that the UE receives the RLC AMD PDU, that is, the base station can know which RLC AMD PDUs have been correctly received by the base station, and which RLC AMD PDUs have not been correctly received by the UE.
  • the MAC-d PDU corresponding to the RLC AMD PDU that has been correctly received or retransmitted has reached the preset threshold, and the corresponding MAC-d PDU is updated to the new data packet to be transmitted by the correspondence between the MAC-d PDU and the RLC AMD PDU;
  • the corresponding MAC-d PDU is sent to the UE through the correspondence between the MAC-d PDU and the RLC AMD PDU, and the data is saved in the MAC cache until received.
  • the indication that the UE has correctly received or the number of retransmission failures reaches a preset threshold.
  • the data that needs to be retransmitted is saved in the MAC layer of the base station, and the retransmission indication of the RLC AMD PDU is carried in the MAC-e PDU to the base station, so that the base station receives the MAC-e PDU and After the retransmission indication is parsed, the retransmission can be directly initiated in the base station, which greatly reduces the transmission delay. Therefore, the retransmitted data packet can also be a data packet carrying the real-time service.
  • the base station can directly initiate retransmission, the AMD PDU data buffer of the RLC layer can be released, and because the base station can quickly obtain information that the AMD PDU is correctly received, the size of the cache maintained in the base station is also smaller than the original. The caching of the RLC layer thus improves the overall processing power of the UTRAN and saves costs.
  • a downlink data retransmission system which has a base station and a user terminal.
  • the method includes: a storage unit that caches downlink data packets in the base station at the designated layer;
  • an update and retransmission unit configured in the base station, refreshing, in the specified layer, the data packet in the storage unit according to the retransmission indication, and resending the data packet that is not correctly transmitted to the user terminal;
  • the user terminal will retransmit the multiplex protocol data unit at the designated layer;
  • the user terminal generates a retransmission indication according to a result of checking the correctness of the received data packet at the radio link control RLC layer, and sends the retransmission indication to the base station;
  • the base station and the user terminal both include the designated layer, and the user terminal has the upper layer signaling multiplexed to the designated layer uplink protocol data unit at the designated layer, and the base station performs corresponding demultiplexing at the designated layer.
  • the designated layer is a medium access control MAC layer.
  • the downlink data packet is a radio link control RLC acknowledgement mode protocol data unit
  • the MAC encapsulates the RLC acknowledge mode protocol data unit into a MAC-d protocol data unit, where the RLC acknowledges the mode protocol data unit and the MAC-d Protocol data unit - corresponding.
  • the retransmission indication includes one of the following information or any combination thereof:
  • Orthogonal Frequency Division Multiplexing OFDM
  • Orthogonal Frequency Division Multiplexing system Orthogonal Frequency Division Multiplexing system
  • MIMO multiple input multiple output

Abstract

Méthode et système de retransmission de données avec abaissement de couche dans une communication sans fil. La méthode comprend: une fonction de retransmission avec décalage vers le bas de la couche RLC effectuée à l'origine dans le contrôleur de réseaux sans fil vers la couche MAC dans la station de base, le transport des indications de retransmission réinjectées par le terminal utilisateur utilisant l'unité de données de protocole MAC-e PDU à laquelle accède le groupe haute vitesse. La station de base met en tampon dans la couche MAC le paquet de données à abaisser provenant de la couche RLC puis envoie ce paquet de données abaissé vers le terminal utilisateur; la sous-couche MAC-e du terminal utilisateur multiplexe les indications de retransmission dans une MAC-e PDU et les envoie à la station de base; la station de base rafraîchit la mémoire tampon de la couche MAC selon lesdites indications de transmission et retransmet le mauvais paquet de données. L'invention concerne également un système correspondant de retransmission de données. Le principe de la présente invention peut raccourcir la durée de retransmission, la quantité de paquets de données mis en tampon dans le RNC est réduite de façon remarquable et la capacité de traitement du RNC augmente.
PCT/CN2006/002040 2005-08-29 2006-08-11 Methode et systeme de retransmission de donnees avec abaissement de couche dans une communication sans fil WO2007025454A1 (fr)

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CN101150340B (zh) * 2007-10-19 2011-04-20 华为技术有限公司 一种增强upa小区覆盖的方法和装置
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