WO2009023985A1 - Procédé de rétroaction d'un service mbs et système de communication sans fil - Google Patents

Procédé de rétroaction d'un service mbs et système de communication sans fil Download PDF

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Publication number
WO2009023985A1
WO2009023985A1 PCT/CN2007/002502 CN2007002502W WO2009023985A1 WO 2009023985 A1 WO2009023985 A1 WO 2009023985A1 CN 2007002502 W CN2007002502 W CN 2007002502W WO 2009023985 A1 WO2009023985 A1 WO 2009023985A1
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WO
WIPO (PCT)
Prior art keywords
feedback
base station
station
feedback channel
multicast service
Prior art date
Application number
PCT/CN2007/002502
Other languages
English (en)
Chinese (zh)
Inventor
Dongyao Wang
Jimin Liu
Xiaobing Leng
Wei Ni
Original Assignee
Alcatel Shanghai Bell Co., Ltd.
Alcatel Lucent
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 Alcatel Shanghai Bell Co., Ltd., Alcatel Lucent filed Critical Alcatel Shanghai Bell Co., Ltd.
Priority to PCT/CN2007/002502 priority Critical patent/WO2009023985A1/fr
Publication of WO2009023985A1 publication Critical patent/WO2009023985A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0094—Indication of how sub-channels of the path are allocated
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0037—Inter-user or inter-terminal allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/30—Resource management for broadcast services

Definitions

  • the present invention is directed to a feedback technology for MBS services, and specifically relates to a feedback method and a wireless communication system for MBS services in an OFDMA-based network, which can support MBS services from user stations to base stations with high efficiency. Feedback to improve the uplink's capabilities without incurring large computational complexity. Background technique
  • MBS digital multimedia services
  • HDTV high definition television
  • DVD digital video broadcasting
  • DAB digital audio broadcasting
  • the technology currently used to transport MBS services over wired networks is broadcast/multicast technology, which allows data to be sent from a single source entity to a receiving entity.
  • these MBS services will be realized in the wireless network. Therefore, the industry has considered implementing MBS services in 3G and future wireless communication networks.
  • FIG. 1 shows a schematic diagram of implementing multicast in a wireless communication network. As shown in Figure 1, the base station BS will transmit data packets of a certain multicast service, and multiple subscriber stations can simultaneously receive data packets of these multicast services.
  • the wireless communication system in the case of multicast must support the ARQ (Automatic Repeat Request) mechanism as in the case of unicast.
  • the base station BS After the base station BS transmits the multicast data packets to the subscriber stations SS in the multicast service group, the subscriber stations SS should feed back ACK or NACK to let the base station know if they correctly received the transmitted multicast data packets. This can help the base station BS manage the wireless more effectively. Resources and improve the utilization efficiency of spectrum resources of the entire wireless network.
  • the base station 3S should allocate uplink resources for all subscriber stations SS. This kind of operation will cause a lot of waste on the uplink.
  • OFDM/OFDMA technology is an increasingly widely used high data rate broadband communication technology because of its high spectral efficiency and tolerance for severe delay spread.
  • OFDMA has been considered as the basic technology of B3G and 4G wireless communication systems.
  • OFDMA's high data rate capability provides strong support for MBS services in future communications networks. Therefore, it is necessary to provide a more efficient feedback method by combining with OFDM/OFDMA technology to support multicast services.
  • a feedback method has been proposed in an 802.16-based OFDM communication system.
  • the method proposes that the base station BS allocates two unique CDMA codes (Cumulative ACK (CA) codes and ARQ feedback request (AFR) codes) to each subscriber station SS in the multicast service group, wherein the CA code is used to notify the base station BS
  • the subscriber station SS has successfully received the multicast data packet transmitted after the correct reception of the data packet, and the AFR code is the bandwidth request code used to obtain the bandwidth required to transmit the ARQ feedback message to the base station BS.
  • the transmission of these CDMA codes is carried out in a common area.
  • CDMA codes are orthogonal to each other, and each subscriber station SS is assigned a different CDMA code, there is no collision between them. Since the scheme based on these CDMA codes requires few uplink resources to support the feedback mechanism in the multicast service, the uplink capability can be significantly increased compared to the original scheme based system.
  • the above feedback method has some problems: (1) The amount of calculation is too large, because the base station BS is required to perform correlation operations in each multicast feedback slot, and the base station BS should have all CDMA codes (in IEEE802.16) 256 CDMA codes), which requires a large number of operations; (2) Although the CDMA codes are orthogonal, the number of CDMA codes that the base station BS can correctly detect at the same time in practical applications is still limited. That is, if there are too many subscriber stations SS transmitting CDMA codes in the same multicast feedback slot, there will still be collision problems. This will cause feedback to fail and limit the size of the supported multicast service groups. Therefore, a more efficient feedback method is needed to improve the ability of the uplink feedback link without incurring large computational complexity. Summary of the invention
  • the present invention has been accomplished in view of the above problems.
  • the object of the present invention is to provide an application to an OFDMA network.
  • the feedback method in the network and the corresponding communication system can support the feedback from the user station to the base station under the MBS service with high efficiency, thereby improving the capability of the uplink and without causing large computational complexity.
  • a method for feeding back a multicast service in an OFDMA-based wireless communication system comprising: the base station assigning a unique identification code to at least one user station in the multicast service group, and Transmitting a feedback channel indication message to a subscriber station of the multicast group through a downlink subframe, the feedback channel message indicating a feedback channel of each user station in the uplink; and feedback from the user station to the base station in respective feedback channels The corresponding message.
  • each subscriber station in the multicast service group is assigned a unique identification code.
  • the respective feedback channels of the subscriber stations are determined by the sub-areas occupied by the positions of the subcarriers and the positions of the symbols in the predetermined region of the uplink subframe.
  • the message fed back to the base station is a predefined codeword.
  • the codeword is modulated on subcarriers in the region.
  • the subcarriers are data subcarriers.
  • the spear carrier comprises a data carrier and a pilot subcarrier.
  • the predetermined areas are distributed in a single subframe.
  • the predetermined area is distributed in a plurality of subframes.
  • the identification code may be assigned only to subscriber stations within the multicast service group that need to provide feedback.
  • an OFDMA-based wireless communication system comprising a base station and at least one user station constituting a multicast service group, wherein the base station transmits the at least one subscriber station through a downlink subframe And transmitting a feedback channel indication message, the feedback channel indication message indicating a feedback channel of each user station in the uplink; and at least one user station feeding back a corresponding message to the base station in a respective feedback channel.
  • the feedback channel of each subscriber station is uniquely determined by the position in the two-dimensional space of frequency and time, the capability of the uplink is improved, and a large amount of calculation is not required.
  • the meaning of different feedback information is assigned to different codewords, so that the user station does not need to feed back specific information, but only feedbacks the corresponding code to implement information feedback to the base station.
  • FIG. 2 is a diagram showing a frame structure of an uplink and a downlink in a wireless communication system according to an embodiment of the present invention
  • Figure 3 shows a schematic diagram of assigning sub-areas for each subscriber station as a feedback channel in a downlink subframe
  • FIG 4 shows a schematic diagram of a wireless communication system according to an embodiment of the present invention into the data transmission fi 1 and the feedback process. detailed description
  • Fig. 2 is a diagram showing the frame structure of an uplink and a downlink in a TOD mode in a wireless communication system according to an embodiment of the present invention.
  • a downlink subframe, a TTG (transmission/reception gap), and an uplink sub-frame are periodically distributed along a time axis in a two-dimensional space composed of a frequency (subcarrier) and a time (symbol).
  • the preamble part indicates the start of a frame, which is used by the subscriber station to establish synchronization with the base station, and the FCH (Frame Control Header) indicates the frame control header, DL—
  • the MAP is a Medium Access Control (MAC) message that defines the resource allocation on the downlink subframe.
  • the UL-MAP is also a medium access control message that defines the resource allocation on the uplink subframe.
  • one area in an uplink subframe is defined in a UL-MAP as a feedback channel of each user station, and an area of these feedback channels in an uplink subframe is referred to as a multicast feedback area,
  • the respective feedback channels of the respective subscriber stations are further defined therein.
  • FIG. 3 shows a schematic diagram of assigning sub-areas for each subscriber station as a feedback channel in a downlink subframe.
  • the multicast feedback area is divided into sub-areas of the same size, for example, 2 subcarrier X3 symbols, which can be sorted in a pre-agreed manner (time priority as illustrated in the figure).
  • Each subscriber station in the multicast service group can match its respective feedback letter according to the assigned unique identification number. Road.
  • each sub-region includes two pilot carriers and four data carriers.
  • the N sub-areas are divided into two columns, but the base station can also allocate different types of areas, and only need to be composed of N sub-areas.
  • each multicast sub-area is considered a feedback channel, so subscriber stations in the multicast service group can use the corresponding feedback channel to transmit feedback messages.
  • the multicast service group includes N subscriber stations, each assigned its own number 0, 1, 2, ... N-l.
  • the N sub-areas in the multicast feedback area correspond to the corresponding user stations, respectively.
  • the zeroth sub-area corresponds to the first user station in the multicast service group
  • the first sub-area corresponds to the second user station in the multicast service group
  • ... the N-1th sub-area corresponds to The Nth subscriber station in the multicast service group.
  • the feedback messages are associated with different codewords, and they are modulated onto different data carriers during the feedback process.
  • the table below shows the mapping between codewords and quadrature modulation.
  • the feedback message carried by the corresponding feedback channel is 0x00. Otherwise, the feedback message is 0x01. Moreover, if the i-th subscriber station SS in the multicast service group requests to change the modulation and coding mode (MCS) of the multicast service, the feedback message is 0x10 in the case of requesting an increase in the MCS, in the case of requesting reduction of the MCS. The feedback message is 0x11.
  • MCS modulation and coding mode
  • the base station BS After receiving the feedback message from the subscriber station SS, the base station BS analyzes these feedback messages and most Optimize its scheduling behavior to provide higher quality of service multicast services for subscriber stations in a multicast service group, such as retransmission, system capabilities (increasing or decreasing MCS).
  • the base station BS In the case of a predetermined time period, if the base station BS does not receive a feedback message from a certain subscriber station, such as the i-th subscriber-station, the base station BS considers that the i-th subscriber station has left the The service group is broadcast and the multicast service data is no longer sent to it, and the number assigned to the subscriber station and the size of the multicast feedback area in the multicast service group are updated. In this way, the base station can adjust the size of the multicast feedback region in the downlink subframe in real time as the data of the subscriber station in the multicast service group changes, thereby improving the adaptability of the wireless communication system.
  • FIG. 4 is a diagram showing a process of data transmission and feedback by a wireless system in accordance with an embodiment of the present invention.
  • a wireless communication system includes a base station BS and at least one subscriber station SS, wherein at least one subscriber station SS constitutes a multicast service group.
  • the base station BS transmits the data packet of the MBS service to each subscriber station SS in the multicast service group.
  • the subscriber station SS receives the MBS data packet from the base station BS, or if the reception condition deteriorates, the subscriber station needs to feed back information to the base station BS through the respective feedback channels as described above, such as an acknowledgement message (ACK), A negative response message (NACK) increases the MCS (modulation and coding scheme) and reduces the MCS.
  • ACK acknowledgement message
  • NACK negative response message
  • the subscriber station SS transmits a DSA-REQ message to the base station BS to request to establish a multicast link with the base station BS, and add the set.
  • DSA-REQ DSA-REQ message
  • the base station BS can accept the subscriber station SS to join the multicast service group, that is, send a DSA-RSP message to the subscriber station SS, the message not only includes relevant configuration information for receiving the multicast service. In addition, it carries a unique number assigned to the subscriber station, such as a serial number (N-1).
  • the base station BS transmits a data packet of an MBS service, such as a mobile TV program, to the subscriber station.
  • the subscriber station SS can also receive data packets for these multicast services.
  • the codeword (0x00) is fed back to the base station BS by the feedback channel defined in the downlink subframe, which indicates an affirmative response message.
  • the base station BS continues to transmit the multicast service data packet to the subscriber station SS. If an error (ERROR) occurs during the reception of the subscriber station SS, the subscriber station SS feeds back the codeword (0x01) to the base station BS, which indicates a negative response message, that is to say the subscriber station has not successfully received the multicast service data packet. In this kind of In this case, the base station BS resends the multicast service data packet.
  • ERPOR error
  • the subscriber station SS In the process of transmitting data, as the communication environment changes, the subscriber station SS needs the base station to change its system capabilities, such as increasing the MCS or reducing the MCS. In the case where the subscriber station SS requests to increase the MCS, the codeword 0x10 is transmitted to the base station BS through the feedback channel defined in the uplink subframe. In the case where the subscriber station SS desires to reduce the MCS, the code 0x11 is transmitted to the base station BS through the feedback channel defined in the uplink subframe.
  • each subscriber station can be assigned a unique identification code, for example, 0, 1, ... N- 2.
  • a new subscriber station requests to join the multicast service group, it requests the base station to join by the DSA-REQ message.
  • the base station BS assigns a unique identification code, such as N-1, to the subscriber station using the DSA-RSP message.
  • the base station can update the identification codes of the remaining subscriber stations in the multicast service group and can redistribute the feedback channels of the respective subscriber stations.
  • the above description is that the feedback area of the multicast service is set in a single downlink subframe, but in the case where the interval between two consecutive transmissions of the multicast service is greater than one frame, the allocated multicast feedback The zone will be multiple frames that can span across domains.
  • the base station BS may not assign a valid identification code to some user stations SS, but only assign a valid identification code to the user station that needs feedback, thereby reducing the size of the multicast feedback area and saving uplink.
  • the bandwidth resource of the link may not assign a valid identification code to some user stations SS, but only assign a valid identification code to the user station that needs feedback, thereby reducing the size of the multicast feedback area and saving uplink.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention porte sur un procédé pour effectuer une rétroaction pour un service de multidiffusion (MBS) de système de communication sans fil basé sur un accès par multiplexage par répartition orthogonale de la fréquence. Le procédé comprend les étapes suivantes : une station de base alloue une identification unique à au moins une station d'utilisateur dans le groupe de multidiffusion, et envoie un message d'indication du canal de rétroaction aux stations d'utilisateur dans le groupe de multidiffusion à travers une sous-trame de liaison descendante ; le message d'indication du canal de rétroaction indiquant le canal de rétroaction de chaque station d'utilisateur dans la liaison montante ; et les stations d'utilisateur renvoient un message correspondant à la station de base sur leur canal de rétroaction respectif. En raison du fait que le canal de rétroaction de chaque station d'utilisateur est déterminé de manière unique par la position dans un espace bidimensionnel de fréquence et de temps, la présente invention améliore la capacité d'une liaison montante et ne nécessite pas beaucoup de calculs. De plus, la présente invention alloue différentes significations d'informations de rétroaction pour différents codes, ce qui amène la station d'utilisateur à ne pas avoir besoin de renvoyer des informations spécifiques et permet de réaliser la rétroaction d'informations par le renvoi uniquement des codes correspondants.
PCT/CN2007/002502 2007-08-20 2007-08-20 Procédé de rétroaction d'un service mbs et système de communication sans fil WO2009023985A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/CN2007/002502 WO2009023985A1 (fr) 2007-08-20 2007-08-20 Procédé de rétroaction d'un service mbs et système de communication sans fil

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PCT/CN2007/002502 WO2009023985A1 (fr) 2007-08-20 2007-08-20 Procédé de rétroaction d'un service mbs et système de communication sans fil

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1692578A (zh) * 2002-11-07 2005-11-02 Lg电子株式会社 发送反馈信息的上行链路公共信道
CN1720678A (zh) * 2003-05-09 2006-01-11 Lg电子株式会社 在广播或者多址通信服务中建立反馈的装置和方法
CN1973457A (zh) * 2004-07-01 2007-05-30 三星电子株式会社 在正交频分多址通信系统中传输上行链路控制信息的系统和方法
CN101114868A (zh) * 2006-07-25 2008-01-30 大唐移动通信设备有限公司 反馈信道分配指示方法及系统

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1692578A (zh) * 2002-11-07 2005-11-02 Lg电子株式会社 发送反馈信息的上行链路公共信道
CN1720678A (zh) * 2003-05-09 2006-01-11 Lg电子株式会社 在广播或者多址通信服务中建立反馈的装置和方法
CN1973457A (zh) * 2004-07-01 2007-05-30 三星电子株式会社 在正交频分多址通信系统中传输上行链路控制信息的系统和方法
CN101114868A (zh) * 2006-07-25 2008-01-30 大唐移动通信设备有限公司 反馈信道分配指示方法及系统

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