WO2009000101A1 - A method and system of mbms data retransmisson - Google Patents

A method and system of mbms data retransmisson Download PDF

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Publication number
WO2009000101A1
WO2009000101A1 PCT/CN2007/001963 CN2007001963W WO2009000101A1 WO 2009000101 A1 WO2009000101 A1 WO 2009000101A1 CN 2007001963 W CN2007001963 W CN 2007001963W WO 2009000101 A1 WO2009000101 A1 WO 2009000101A1
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WO
WIPO (PCT)
Prior art keywords
same
data
uplink
mbms service
uplink feedback
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PCT/CN2007/001963
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English (en)
French (fr)
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WO2009000101A8 (zh
Inventor
Yonggang Wang
Zhongji Hu
Hua Chao
Yu Chen
Original Assignee
Alcatel Shanghai Bell Co., Ltd.
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Application filed by Alcatel Shanghai Bell Co., Ltd. filed Critical Alcatel Shanghai Bell Co., Ltd.
Priority to EP07721536A priority Critical patent/EP2161868A4/en
Priority to PCT/CN2007/001963 priority patent/WO2009000101A1/zh
Priority to KR1020107001448A priority patent/KR101364466B1/ko
Priority to US12/665,842 priority patent/US8224343B2/en
Priority to JP2010512486A priority patent/JP5207416B2/ja
Priority to CN200780053388XA priority patent/CN101689970B/zh
Publication of WO2009000101A1 publication Critical patent/WO2009000101A1/zh
Publication of WO2009000101A8 publication Critical patent/WO2009000101A8/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements 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
    • H04L1/18Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867Arrangements specially adapted for the transmitter end
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements 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
    • H04L1/18Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829Arrangements specially adapted for the receiver end
    • H04L1/1854Scheduling and prioritising arrangements
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements 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
    • H04L1/18Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829Arrangements specially adapted for the receiver end
    • H04L1/1861Physical mapping arrangements
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements 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
    • H04L1/1607Details of the supervisory signal
    • H04L1/1692Physical properties of the supervisory signal, e.g. acknowledgement by energy bursts
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L2001/0092Error control systems characterised by the topology of the transmission link
    • H04L2001/0093Point-to-multipoint
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/04Wireless resource allocation
    • H04W72/044Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446Resources in time domain, e.g. slots or frames
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/04Wireless resource allocation
    • H04W72/044Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453Resources in frequency domain, e.g. a carrier in FDMA
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/30Resource management for broadcast services

Definitions

  • the present invention relates to the field of mobile communications, and more particularly to a multimedia broadcast multicast service.
  • MBMS A method and system for data retransmission, in which uplink feedback signaling is multiplexed/combined in the same uplink time-frequency resource block to save resource consumption and avoid uplink congestion.
  • the 3GPP (3rd Generation Partnership Project) launched the Long Term Evolution Research Project (LTE) in 2005, hoping to support the growing needs of operators and users with higher data throughput and better network performance.
  • LTE Long Term Evolution Research Project
  • Multimedia Broadcast/Multicast Service is a service introduced by 3GPP Rel6, which refers to a point-to-multipoint service in which a data source sends data to multiple users, thereby realizing network (including core network and access network) resource sharing.
  • 3GPP Rel6 refers to a point-to-multipoint service in which a data source sends data to multiple users, thereby realizing network (including core network and access network) resource sharing.
  • the MBMS service can realize low-rate message-like multicast and broadcast, and can also realize multicast and broadcast of higher-rate multimedia services by using a common transport channel and a public radio bearer, for example, Mobile TV.
  • the present application is generally applied to the field of mobile communication based on Orthogonal Frequency Division Multiple Access (OFDM) for 3GPP long term evolution, especially for evolved multimedia broadcast and multicast in an evolved UMTS Radio Access Network (E-UTRAN).
  • OFDM Orthogonal Frequency Division Multiple Access
  • EMBMS Business (EMBMS) transmission design.
  • EMBMS is the evolution of multimedia broadcast and multicast services in 3GPP LTE. Due to the use of completely different physical layer transmission technologies, namely Orthogonal Frequency Division Multiplexing (OFDM) transmission, EMBMS and WCDMA (Wideband Code Division Multiple Access) Compared to MBMS in the Release Agreement, there are many different new features.
  • OFDM Orthogonal Frequency Division Multiplexing
  • WCDMA Wideband Code Division Multiple Access
  • the transmission of the MBMS service can be delivered in two modes, one is multi-cell transmission, and the other is single-cell transmission.
  • the present invention is directed to a single-cell transmission mode.
  • single cell transmission i.e., a specific cell point-to-multipoint transmission mode
  • the multicast service is independent in each cell and does not require synchronous transmission.
  • the MBMS Traffic Channel (MTCH) is mapped onto the Downlink Shared Data Channel (DL-SCH).
  • the UE mobile station
  • E-UTRA evolved UTRA
  • the downlink shared data channel (DL-SCH) is mainly used to map the dedicated traffic channel (DTCH).
  • DTCH dedicated traffic channel
  • the DL-SCH has a hybrid automatic retransmission. (HARQ), characteristics of link adaptation, dynamic and semi-static resource allocation and channel quality indication (CQI) reporting based on dynamically changing modulation coding and transmit power.
  • HARQ hybrid automatic retransmission.
  • the DL-SCH channel is broadcast throughout the cell.
  • the same method as the transmission of the unicast service, such as HARQ can be applied to the transmission of the multicast service.
  • forward error correction coding In data communication, in order to obtain correct and correct transmission data, forward error correction coding is usually applied.
  • FEC Error control combined with automatic repeat request, called HARQ.
  • the FEC can be used to obtain the correct received data block at the receiving end or to determine that the wrong data block has been received. Then, the receiving end sends a feedback message to the transmitting end. If the data block is correct, an acknowledgement (ACK) message is sent. If the data block is wrong, a negative acknowledgement (NACK) message is sent, and the sending end is ACK or NACK according to the received feedback information. Choose whether to send the next data block or resend the data block that received the error.
  • ACK acknowledgement
  • NACK negative acknowledgement
  • the prior art always performs the service for one UE in the process of the HARQ, that is, the UE receives the unicast data, and when determining that the data block is incorrect, sends a NACK message on the uplink channel to request retransmission.
  • the data is sent to multiple users. If many UEs receive data but judge the erroneous data block, and simultaneously send a NACK message on the uplink channel, the uplink channel will be congested.
  • the applicant considers that the uplink NACK signaling for one service data packet can be shared in the same time-frequency resource. Summary of the invention
  • the object of the present invention is to provide a method and system for data retransmission of an MBMS service, in which uplink feedback signaling is multiplexed/combined in the same uplink time-frequency resource block to save resource consumption and avoid uplink. congestion.
  • a method for data retransmission of a multimedia broadcast multicast service MBMS including: a base station allocates an uplink time-frequency resource block to a mobile station; and the mobile station will receive a downlink for the mobile station
  • the uplink feedback signaling of the MBMS service data is fed back to the base station on the allocated uplink time-frequency resource block, where the uplink feedback signaling for the same downlink MBMS service data is merged in the same
  • the uplink feedback signaling for different downlink service data is multiplexed on one uplink time-frequency resource block; and the base station determines whether the data block needs to be retransmitted according to the fed back uplink feedback signaling.
  • the merging comprises: transmitting uplink feedback signaling for the same downlink MBMS service data to the same frequency domain resource, so that all mobile stations for the same multicast service share the same frequency domain resource.
  • the frequency domain resource is a subcarrier.
  • the combining comprises: enabling uplink feedback signaling for the same downlink MBMS service data to share the same time domain resource transmission, so that all mobile stations for the same multicast service share the same time domain resource.
  • the time domain resource is the same symbol of different subcarriers.
  • all mobile stations receiving the same downlink MBMS service use the same pilot scheme on the shared time-frequency resources used for feedback uplink feedback signaling.
  • the multiplexing includes: multiplexing uplink feedback signaling for different downlink MBMS service data in the same frequency domain resource block to distinguish uplink feedback signaling of different downlink MBMS service data.
  • the multiplexing is time division multiplexing.
  • the multiplexing is frequency division multiplexing.
  • the uplink feedback signaling is a negative acknowledgement NACK signaling.
  • the base station feeds back NACK signaling to indicate that the data block needs to be retransmitted.
  • the NACK signaling and the acknowledgement ACK signaling are multiplexed with the I channel and the Q channel, and are fed back to the base station.
  • the MBMS service is an evolved MBMS service.
  • the data retransmission uses a hybrid automatic retransmission HARQ mechanism.
  • a system for data retransmission of a multimedia broadcast multicast service MBMS including: a base station, which allocates an uplink time-frequency resource block to a mobile station, and receives uplink feedback according to feedback from the mobile station. Signaling to determine whether a data block needs to be retransmitted; and the mobile station, to feed back feedback signaling for the downlink MBMS service data it receives to the base station on the allocated uplink time-frequency resource block, where the same
  • the uplink feedback signaling of the downlink MBMS service data is combined in the same uplink time-frequency resource, and the uplink feedback signaling for different downlink MBMS service data is multiplexed in one uplink time-frequency resource.
  • DRAWINGS On the source block.
  • NACK signaling of the same downlink multicast data shares one frequency domain sub-band resource, and NACK signaling of different downlink multicast data is frequency-division multiplexed into one time-frequency resource block;
  • FIG. 3 is a schematic diagram showing that NACK signaling of the same downlink multicast data shares a time domain resource, and NACK signaling of different downlink multicast data is time-division multiplexed into a time-frequency resource block;
  • FIG. 4 is a diagram showing multiplexing of I and Q paths for NACK signaling and ACK signaling; and FIG. 5 is a flow chart showing a method of data retransmission according to the present invention. detailed description
  • the multicast data adopting the HARQ mechanism has its own characteristics, such as: if any UE in the cell feeds back NACK signaling, the data block needs to be retransmitted; the UE only needs to feed back NACK signaling. And can be fed back in an idle state; the uplink feedback signaling is multiplexed/combined in the same uplink time-frequency resource block to save resource consumption and avoid uplink congestion.
  • the basic scheme for uplink transmission in E-UTRA is to use single-carrier transmission with cyclic prefix (CP), that is, OF hop called DFT spreading.
  • layer 1/layer 2 control signaling In the uplink, layer 1/layer 2 control signaling, data And the pilot is multiplexed in the time-frequency domain.
  • One of the layer 1/layer 2 control signaling information, the channel quality indicator (CQI) and the ACK/NACK information related to the downlink data transmission are all "non-data related" messages.
  • “Non-data-related” signaling is not transmitted simultaneously with data.
  • the "non-data-related" signaling of different UEs is multiplexed together in frequency/time/code, or multiplexed in a mixed manner, and exclusive.
  • the mode is transmitted in a time-frequency domain resource, as shown by the elliptical circle in Figure 1.
  • the uplink control signaling of one subcarrier allocated to multiple UEs of one multicast service is shown by the elliptical circle of FIG.
  • NACK signaling of the same downlink multicast data is shared in one frequency domain subband resource; for example, each subcarrier is allocated to one MBMS service.
  • Feedback it must be noted here that all UEs of a multicast service share a frequency domain sub-band resource.
  • the uplink feedback signaling for different downlink MBMS service data is frequency-division multiplexed in the same frequency domain resource block to distinguish the uplink feedback signaling of different downlink MBMS service data.
  • NACK signaling of the same downlink multicast data can be shared in one time domain resource; for example, the same subcarriers A symbol is assigned to the feedback of an MBMS service. It should be noted here that all UEs of a multicast service share a time domain resource.
  • uplink feedback signaling for different downlink MBMS service data is time-division multiplexed in the same frequency domain resource block to distinguish uplink feedback signaling of different downlink MBMS service data.
  • the NACK signals sent from different UEs are the same, so its time domain waveform is also consistent, except that there are some small propagation delays, and the cell with a radius of 1000 meters has 3. 3 Microsecond delay.
  • all UEs use the same pilot scheme, so that the combination of signals can be done in the spatial propagation process and transparent to the base station.
  • the base station is sufficiently aware that the UE having the service transmits NACK signaling and retransmits the transport block.
  • the location of the NACK signaling of a downlink MBMS service in the uplink time-frequency domain is indicated by the MBMS Control Channel (MCCH).
  • MCCH MBMS Control Channel
  • the UE can know exactly which time-frequency domain location to feed back NACK signaling. If the ACK signaling also needs to be fed back to the base station, the I and Q paths can be multiplexed with the NACK signaling, as shown in Figure 4 using QPSK (Quadrature Phase Shift Keying) modulation.
  • QPSK Quadrature Phase Shift Keying
  • Figure 5 is a flow chart showing a method of data retransmission in accordance with the present invention.
  • step 501 the base station allocates an uplink time-frequency resource block to the mobile station.
  • step 503 the mobile station combines the uplink feedback signaling (for example, NACK signaling) for each downlink MBMS service data into the allocated uplink time-frequency resource block and feeds back to the base station, where, for the same downlink MBMS The uplink feedback signaling of the service data is combined in the same uplink time-frequency resource, and the uplink feedback signaling for different downlink MBMS service data is multiplexed on one uplink time-frequency resource block.
  • step 505 the base station determines whether it is necessary to retransmit the data block according to the fed back uplink feedback signaling.
  • the invention proposes a different way from the previous HARQ, which is directed to the broadcast multicast service, not based on the user, but based on the service feedback NACK message. All UEs receiving the same service are allocated the same uplink resource.
  • the NACK feedback signals sent from the UE have the same spatial waveform, but have different propagation delays when arriving at the base station.
  • the Cyclic Prefix (CP) window eliminates the effects of these different delays and combines the reception of all UE signals.
  • the method for feedback retransmission of signals proposed by the present invention can avoid assigning uplink feedback to each user In the case of a channel, the situation of uplink congestion is caused. Moreover, since it is a multicast service, only a small number of UEs need to retransmit data, and the manner in which the uplink feedback channel is allocated for the service also conforms to the law of point-to-multipoint transmission.

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  • 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)

Description

用于多媒体广播组播业务的数据重传的方法和***
技术领域
本发明涉及移动通信领域, 更具体地, 涉及一种用于多媒体广播组播业务
(MBMS ) 的数据重传的方法和***, 其中, 上行反馈信令复用 /合并在同一个上 行时频资源块内, 以节省资源消耗和避免上行拥塞。 背景技术
3GPP (第三代合作伙伴计划) 在 2005年启动了长期演进研究项目 (LTE), 希望以更高的数据吞吐量和更好的网络性能, 为运营商和用户不断增长的需求提 供支持。
多媒体广播 /组播业务 (MBMS ) 是 3GPP Rel6引入的一项业务, 是指一个数 据源向多个用户发送数据的点到多点业务,从而实现网络(包括核心网和接入网) 资源共享, 以尽可能少的资源实现对尽可能多的、 具有相同需求的多媒体用户的 服务。 在无线接入网, MBMS业务通过使用公共传输信道和公共无线承载, 既能实 现纯文本低速率的消息类组播和广播, 也能实现较高速率的多媒体业务的组播和 广播, 例如, 手机电视。
目前, 关于 EMBMS (演进的 MBMS ) 的各项研究正在进行中。
本申请一般应用于基于正交频分复用多址 (0FDMA) 的 3GPP长期演进的移动 通信领域, 特别是在演进的 UMTS无线接入网 (E- UTRAN) 中对演进的多媒体广播 和组播业务 (EMBMS ) 传输的设计。
EMBMS是多媒体广播和组播业务在 3GPP LTE的演进, 由于釆用了完全不同的 物理层传输技术, 即正交频分复用 (OFDM) 的传输方式, EMBMS与 WCDMA (宽带码 分多址接入) Release协议中的 MBMS相比, 具有了很多不同的全新的特征。
MBMS业务的传输可以在两种方式下下发, 一是多小区传输, 二是单小区传 输, 本发明针对的是单小区传输的方式。 在单小区传输的情况下, 即特定小区点 到多点传输的方式, 组播业务在各个小区是独立的, 并且不需要同步传输。 MBMS 业务信道 (MTCH ) 被映射到下行共享数据信道上 (DL- SCH)。
如果在演进的 UTRA ( E-UTRA ) 中 UE (移动台) 不能从多个异步的小区中同 时接收数据并做合并, 则它的性能将不能获得与 UTRA Rel6中的 MBMS软合并相同 的性能。
在 E- UTRA中, 下行共享数据信道 (DL- SCH) 主要是用于映射专用业务信道 (DTCH)o 为了提高 UE单播业务的峰值速率和***的吞吐率, DL- SCH具有混合自 动重传 (HARQ)、 基于动态改变调制编码和发射功率的链路自适应、 动态和半静 态的资源分配和信道质量指示 (CQI ) 报告的特性。
当 MTCH被映射到 DL- SCH后, DL-SCH信道会在整个小区广播。 为了提高在小 区边界数据的传输速率和降低误块率,与传输单播业务同样方法和 ¾程,如 HARQ, 可以被应用在传输组播业务上。
在数据通信中, 为了获得正确无误的传输数据, 通常应用前向纠错编码
(FEC) 和自动重复请求结合在一起的差错控制, 称为 HARQ。 FEC可以使得在接收 端获得正确的接收数据块, 或判定接收了错误的数据块。 而后接收端给发送端一 个反馈信息, 若数据块正确, 则发送肯定应答 (ACK) 消息, 若数据块错误, 则 发送否定应答 (NACK) 消息, 发送端根据接收到的反馈信息是 ACK还是 NACK选择 发送下一个数据块, 还是重发该接收错误的数据块。
现有技术总是在 HARQ的过程中针对一个 UE的业务进行, 即 UE接收单播数据, 当判断数据块有误时, 在上行信道发送一个 NACK消息, 请求重传。 但是在组播情 况下, 数据是向多个用户群发, 如果很多 UE接收数据但判断错误数据块时, 同时 在上行信道发送 NACK消息, 则会导致上行信道的拥塞。 根据在 E- UTRA中物理层的 设计的特点, 申请人考虑到可以将针对一个业务数据包的上行 NACK信令共用在同 一个时频资源内。 发明内容
为了克服现有技术的上述缺陷提出了本发明。 因此, 本发明的目的是提出 一种用于 MBMS业务的数据重传的方法和***, 其中, 上行反馈信令复用 /合并在 同一个上行时频资源块内, 以节省资源消耗和避免上行拥塞。
为了实现上述目的,根据本发明,提出了一种用于多媒体广播组播业务 MBMS 的数据重传的方法, 包括: 基站给移动台分配上行时频资源块; 移动台将针对其 所接收的下行 MBMS业务数据的上行反馈信令在所分配的上行时频资源块上向基 站进行反馈, 其中将针对同一个下行 MBMS业务数据的上行反馈信令合并在同一个 上行时频资源中, 而将针对不同下行 业务数据的上行反馈信令复用在一个上 行时频资源块上; 以及基站根据所反馈的上行反馈信令来确定是否需要重传数据 块。
优选地, 所述合并包括: 使针对同一个下行 MBMS业务数据的上行反馈信令 共用同一个频域资源发送, 以使针对同一组播业务的所有移动台共享同一个频域 资源。
优选地, 所述频域资源为子载波。
优选地, 所述合并包括: 使针对同一个下行 MBMS业务数据的上行反馈信令 共用同一个时域资源发送, 以使针对同一组播业务的所有移动台共享同一个时域 资源。
优选地, 所述时域资源为不同子载波的同一个符号。
优选地, 接收同一个下行 MBMS业务的所有移动台在共用的用于反馈上行反 馈信令的时频资源上釆用同一个导频方案。
优选地, 所述复用包括: 将针对不同下行 MBMS业务数据的上行反馈信令复 用在同一个频域资源块内, 以区分不同下行 MBMS业务数据的上行反馈信令。
优选地, 所述复用为时分复用。
优选地, 所述复用为频分复用。
优选地, 所述上行反馈信令为否定应答 NACK信令。
优选地, 当针对同一 MBMS业务数据, 小区中任一个移动台检测到数据传输 差错, 则向基站反馈 NACK信令, 以指示需要重传数据块。
优选地, 所述 NACK信令与肯定应答 ACK信令进行 I路和 Q路的复用, 并被反馈 到基站。
优选地, 所述 MBMS业务为演进的 MBMS业务。
优选地, 所述数据重传釆用混合自动重传 HARQ机制。
另外, 根据本发明, 还提出了一种用于多媒体广播组播业务 MBMS的数据重 传的***, 包括: 基站, 给移动台分配上行时频资源块, 并且根据从移动台反馈 来的上行反馈信令来确定是否需要重传数据块; 以及移动台, 将针对其所接收的 下行 MBMS业务数据的上行反馈信令在所分配的上行时频资源块上向基站进行反 馈, 其中将针对同一个下行 MBMS业务数据的上行反馈信令合并在同一个上行时频 资源中, 而将针对不同下行 MBMS业务数据的上行反馈信令复用在一个上行时频资 源块上。 附图说明
通过参考以下结合附图对所釆用的优选实施例的详细描述, 本发明的上述 目的、 优点和特征将变得显而易见, 其中- 图 1是示出了不同 UE的 "非数据相关"信令以独占的方式在一个时频域资源 传输的示意图;
图 2是示出了同一个下行组播数据的 NACK信令共用一个频域子带资源, 不同 下行组播数据的 NACK信令被频分复用在一个时频资源块内的示意图;
图 3是示出了同一个下行组播数据的 NACK信令共用一个时域资源, 不同下行 组播数据的 NACK信令被时分复用在一个时频资源块内的示意图;
图 4是示出了对 NACK信令与 ACK信令进行 I路和 Q路的复用的示意图; 以及 图 5是示出了根据本发明的数据重传的方法的流程图。 具体实施方式
根据本发明, 区别于单播业务, 组播数据采用 HARQ的机制有它自己的特点, 如: 小区中任何一个 UE反馈 NACK信令则需要重传该数据块; UE只需要反馈 NACK信 令, 并且可以在空闲状态下反馈; 上行反馈信令复用 /合并在同一个上行时频资 源块内, 以节省资源消耗和避免上行拥塞。
下面将参考附图来说明本发明的优选实施例。
在 E-UTRA中上行传输的基本方案是釆用带循环前缀 (CP〉 的单载波传输, 即名为 DFT扩频的 OF遍。 在上行链路中, 层 1/层 2控制信令、 数据和导频被复用在 时频域内。 层 1/层 2控制信令信息的一种, 信道质量指示 (CQI ) 和与下行数据传 输相关的 ACK/NACK信息, 都属于 "非数据相关" 信令。 "非数据相关" 信令不与 数据同时传输,不同 UE的"非数据相关"信令以频率 /时间 /码的方式复用在一起, 或者以混合的方式复用, 并以独占的方式在一个时频域资源传输, 如图 1中的椭 圆形圈所示部分。
在一个资源块 (375 kfe带宽) 中, 一个子载波分配给一个组播业务的多个 UE的上行控制信令如图 2的椭圆形圈所示。 在图 2中, 同一个下行组播数据的 NACK 信令被共用在一个频域子带资源内; 例如, 每一个子载波分配给一个 MBMS业务的 反馈, 这里必须注意的是一个组播业务的所有 UE共享一个频域子带资源。 另外, 在图 2中,· 针对不同下行 MBMS业务数据的上行反馈信令频分复用在同一个频域资 源块内, 以区分不同下行 MBMS业务数据的上行反馈信令。
当然不失一般性, 在图 3中 (特别是图 3的椭圆形圈所示), 同一个下行组播 数据的 NACK信令可以被共用在一个时域资源内; 例如, 不同子载波的同一个符号 分配给一个 MBMS业务的反馈, 这里须注意的是一个组播业务的所有 UE共享一个时 域资源。 另外, 在图 3中, 针对不同下行 MBMS业务数据的上行反馈信令时分复用 在同一个频域资源块内, 以区分不同下行 MBMS业务数据的上行反馈信令。
从 OFDM技术的观点来看, 从不同 UE发出的 NACK信号都是一样的, 因此它的 时域波形也是一致的, 只不过有一些很小的传播时延, 1000米半径的小区有 3. 3 微秒的延迟。 为了精确估计信道响应, 所有的 UE采用同一个导频方案, 这样, 信 号的合并可以在空间传播过程中完成, 对于基站是透明的。 基站足以知晓有该业 务的 UE发送 NACK信令, 并重传该传输块。
一个下行 MBMS业务的 NACK信令在上行时频域上位置由 MBMS控制信道(MCCH) 指示。 UE接收到 MCCH后能确切知晓在哪个时频域位置上反馈 NACK信令。 如果 ACK 信令也需要被反馈给基站, 则可以和 NACK信令进行 I路和 Q路的复用, 在使用 QPSK (四相移相键控) 调制下, 如图 4所示。
图 5是示出了根据本发明的数据重传的方法的流程图。
如图 5所示, 在步骤 501, 基站给移动台分配上行时频资源块。 然后, 在步 骤 503 , 移动台将针对各个下行 MBMS业务数据的上行反馈信令 (例如 NACK信令) 合并在所分配的上行时频资源块并向基站进行反馈, 其中, 将针对同一个下行 MBMS业务数据的上行反馈信令合并在同一个上行时频资源中, 而将针对不同下行 MBMS业务数据的上行反馈信令复用在一个上行时频资源块上。 最后, 在步骤 505, 基站根据所反馈的上行反馈信令来确定是否需要重传数据块。
该发明提出了一种与以往 HARQ都不同的方式, 它针对广播组播业务, 不是 基于用户, 而是基于业务反馈 NACK消息。 所有接收同一业务的 UE被分配同一个上 行资源,在采用 OFDM传输技术时,从 UE发出的 NACK反馈信号具有相同的空间波形, 只不过到达基站时有不同的传播时延。 循环前缀 (CP) 窗可以消除这些不同时延 的影响, 而将所有 UE的信号合并接收。
本发明提出的反馈重传信号的方法可以避免在针对每个用户分配上行反馈 信道的情况下导致上行拥塞的情况。 而且, 由于是组播业务, 只需要有少数 UE反 馈就要重传数据, 针对业务分配上行反馈信道的方式也符合点对多点传输的规 律。
尽管以上已经结合本发明的优选实施例示出了本发明, 但是本领域的技术 人员将会理解, 在不脱离本发明的精神和范围的情况下, 可以对本发明进行各种 修改、 替换和改变。 因此, 本发明不应由上述实施例来限定, 而应由所附权利要 求及其等价物来限定。

Claims

权 利 要 求
1、 一种用于多媒体广播组播业务 MBMS的数据重传的方法, 包括:
基站给移动台分配上行时频资源块;
移动台将针对其所接收的下行 MBMS业务数据的上行反馈信令在所分配的上 行时频资源块上向基站进行反馈, 其中将针对同一个下行 MBMS业务数据的上行反 馈信令合并在同一个上行时频资源中, 而将针对不同下行 MBMS业务数据的上行反 馈信令复用在一个上行时频资源块上; 以及
基站根据所反馈的上行反馈信令来确定是否需要重传数据块。
2、 根据权利要求 1所述的方法, 其特征在于: 所述合并包括: 使针对同一 个下行 MBMS业务数据的上行反馈信令共用同一个频域资源发送, 以使针对同一组 播业务的所有移动台共享同一个频域资源。
3、 根据权利要求 2所述的方法, 其特征在于: 所述频域资源为子载波。
4、 根据权利要求 1所述的方法, 其特征在于: 所述合并包括: 使针对同一 个下行 MBMS业务数据的上行反馈信令共用同一个时域资源发送, 以使针对同一组 播业务的所有移动台共享同一个时域资源。
5、 根据权利要求 4所述的方法, 其特征在于: 所述时域资源为不同子载波 的同一个符号。
6、 根据权利要求 1所述的方法, 其特征在于: 接收同一个下行 MBMS业务的 所有移动台在共用的用于反馈上行反馈信令的时频资源上采用同一个导频方案。
7、 根据权利要求 1所述的方法, 其特征在于: 所述复用包括: 将针对不同 下行 MBMS业务数据的上行反馈信令复用在同一个频域资源块内, 以区分不同下行 MBMS业务数据的上行反馈信令。
8、 根据权利要求 7所述的方法, 其特征在于: 所述复用为时分复用。
9、 根据权利要求 7所述的方法, 其特征在于: 所述复用为频分复用。
10、 根据权利要求 1所述的方法, 其特征在于: 所述上行反馈信令为否定应 答 NACK信令。
11、 根据权利要求 10所述的方法, 其特征在于: 当针对同一 MBMS业务数据, 小区中任一个移动台检测到数据传输差错, 则向基站反馈 NACK信令, 以指示需要 重传数据块。
12、 根据权利要求 10所述的方法, 其特征在于: 所述 NACK信令与肯定应答 ACK信令进行 I路和 Q路的复用, 并被反馈到基站。
13、 根据权利要求 1所述的方法, 其特征在于: 所述 MBMS业务为演进的 MBMS 业务。
14、 根据权利要求 1所述的方法, 其特征在于: 所述数据重传采用混合自动 重传 HARQ机制。
15、 一种用于多媒体广播组播业务 MBMS的数据重传的***, 包括: 基站, 给移动台分配上行时频资源块, 并且根据从移动台反馈来的上行反 馈信令来确定是否需要重传数据块; 以及
移动台, 将针对其所接收的下行 MBMS业务数据'的上行反馈信令在所分配的 上行时频资源块上向基站进行反馈, 其中将针对同一个下行 MBMS业务数据的上行 反馈信令合并在同一个上行时频资源中, 而将针对不同下行 MBMS业务数据的上行 反馈信令复用在一个上行时频资源块上。
16、 根据权利要求 15所述的***, 其特征在于: 所述移动台使针对同一个 下行 MBMS业务数据的上行反馈信令共用同一个频域资源发送, 以使针对同一组播 业务的所有移动台共享同一个频域资源。
17、 根据权利要求 16所述的***, 其特征在于: 所述频域资源为子载波。
18、 根据权利要求 15所述的***, 其特征在于: 所述移动台使针对同一个 下行 MBMS业务数据的上行反馈信令共用同一个时域资源发送, 以使针对同一组播 业务的所有移动台共享同一个时域资源。
19、 根据权利要求 18所述的***, 其特征在于: 所述时域资源为不同子载 波的同一个符号。
20、 根据权利要求 15所述的***, 其特征在于: 接收同一个下行 MBMS业务 的所有移动台在共用的用于反馈上行反馈信令的时频资源上采用同一个导频方 案。
21、 裉据权利要求 15所述的***, 其特征在于: 所述移动台将针对不同下 行 MBMS业务数据的上行反馈信令复用在同一个频域资源块内, 以区分不同下行 MBMS业务数据的上行反馈信令。
22、 根据权利要求 21所述的***, 其特征在于: 所述复用为时分复用。
23、 根据权利要求 21所述的***, 其特征在于: 所述复用为频分复用。
24、 根据权利要求 15所述的***, 其特征在于: 所述上行反馈信令为否定 应答 NACK信令。
25、 根据权利要求 24所述的***, 其特征在于: 所述移动台将所述 NACK信 令与肯定应答 ACK信令进行 I路和 Q路的复用, 并反馈到基站。
26、根据权利要求 15所述的***, 其特征在于: 所述 MBMS业务为演进的 MBMS 业务。
27、 根据权利要求 15所述的***, 其特征在于: 所述数据重传釆用混合自 动重传 HARQ机制。
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JP2010531100A (ja) 2010-09-16
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US20100177676A1 (en) 2010-07-15
JP5207416B2 (ja) 2013-06-12
CN101689970A (zh) 2010-03-31
KR101364466B1 (ko) 2014-02-19
KR20100052459A (ko) 2010-05-19
EP2161868A1 (en) 2010-03-10
US8224343B2 (en) 2012-07-17
WO2009000101A8 (zh) 2010-01-28

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