WO2019090790A1 - 在lte小基站系统中改进中继站传输性能的方法 - Google Patents

在lte小基站系统中改进中继站传输性能的方法 Download PDF

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Publication number
WO2019090790A1
WO2019090790A1 PCT/CN2017/110774 CN2017110774W WO2019090790A1 WO 2019090790 A1 WO2019090790 A1 WO 2019090790A1 CN 2017110774 W CN2017110774 W CN 2017110774W WO 2019090790 A1 WO2019090790 A1 WO 2019090790A1
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WIPO (PCT)
Prior art keywords
tti
denodeb
bundle
downlink
relay
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PCT/CN2017/110774
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English (en)
French (fr)
Inventor
刘泽
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苏州微站通信科技有限公司
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Publication of WO2019090790A1 publication Critical patent/WO2019090790A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W40/00—Communication routing or communication path finding
    • H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
    • H04W40/22—Communication route or path selection, e.g. power-based or shortest path routing using selective relaying for reaching a BTS [Base Transceiver Station] or an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2603—Arrangements for wireless physical layer control
    • H04B7/2606—Arrangements for base station coverage control, e.g. by using relays in tunnels
    • 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
    • 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

Definitions

  • the present invention relates to a method of improving relay station transmission performance in an LTE small base station system.
  • the LTE Release 10 introduces air interface signal relay, which is a key technology in LTE systems.
  • the LTE relay is a decode-and-forward relay.
  • the relay station RN (Relay Node) decodes the received air interface signal of the source base station DeNodeB (Donor eNodeB), re-encodes and transmits the signal to the terminal (UE). .
  • the signal can only be transmitted from the source base station DeNodeB to the UE via one relay station RN.
  • the air interface link from the DeNodeB to the RN is called the backhaul link.
  • the backhaul link is defined as the Un port, and the air interface access link from the RN to the UE is called the Uu port.
  • In-band relaying is an important relay type in LTE systems.
  • the backhaul link, the access link, and the direct transmission link all operate on the same spectrum.
  • the downlink or uplink transmission cannot be simultaneously performed on the backhaul link and the access link, but must be staggered in time. . Therefore, for the relay station, the relay subframe is divided into a backhaul subframe and an access subframe, and the downlink and uplink transmissions of the backhaul link of the relay station are performed on the downlink and uplink backhaul subframes respectively, and the downlink and uplink transmissions of the access link are respectively performed.
  • the relay station Performed on the downlink and uplink access subframes.
  • the relay station For the downlink backhaul subframe, the relay station needs to perform downlink transmission of the access link on the first or 2 OFDM symbols before the subframe, and perform downlink reception of the backhaul link on the remaining available resources.
  • the TD-LTE system has fewer uplink and downlink subframes and more resources.
  • the technical solution of the present invention is to design a method for improving the transmission performance of a relay station in an LTE small base station system, and the source base station DeNodeB is configured by the field RN-SubframeCofig-r10 in the layer 2 L2 signaling according to the channel state information CSI.
  • TTI bundling DeNodeB retransmits a downlink data by DCI scheduling in the R-PDCCH, and retransmits the downlink backhaul subframe after TTI_BUNDLE_SIZE-1; TTI_BUNDLE_SIZE is defined in DeNodeB and RN, and the resource allocation of retransmission is the same as the new transmission; Information feedback on the PUCCH on the last TTI of the bundle.
  • An advantage and a beneficial effect of the present invention is that the present invention uses TTI bundling to transmit downlink signals on the backhaul downlink, reducing transmission delay under conditions of poor wireless signals.
  • Combining TTI bundling with relay relay can improve cell coverage.
  • Configuring TTI bundling in L2 signaling can prevent the UE from repeatedly demodulating downlink data and saving retransmission occupation. DCI resources.
  • a method for improving relay station transmission performance in an LTE small base station system the source base station DeNodeB configuring TTI bundling through a field RN-SubframeCofig-r10 according to channel state information CSI in layer 2 L2 signaling; DeNodeB scheduling new through DCI in R-PDCCH A downlink data is transmitted, and the downlink backhaul subframe is retransmitted after TTI_BUNDLE_SIZE-1; TTI_BUNDLE_SIZE is defined in the DeNodeB and the RN, and the resource allocation of the retransmission is the same as the new transmission; the information feedback on the PUCCH on the last TTI of the NB is used. .

Abstract

本发明公开了在LTE小基站系统中改进中继站传输性能的方法，其特征在于：源基站DeNodeB根据信道状态信息CSI在层二L2信令中通过字段RN-SubframeCofig-r10配置TTI bundling；DeNodeB通过R-PDCCH中DCI调度新传一个下行数据，在TTI_BUNDLE_SIZE-1后的下行回程子帧重传；TTI_BUNDLE_SIZE在DeNodeB和RN中定义，重传的资源分配和新传一样；RN用bundle的最后的TTI上的PUCCH上的信息反馈。本发明在回程下行链路使用TTI bundling传输下行信号，在无线信号差的条件下减少了传输延迟。将TTI bundling和中继Relay结合可以提高小区覆盖。在L2信令中配置TTI bundling可以避免UE重复解调下行数据，节省重传占用的DCI资源。

Description

在LTE小基站系统中改进中继站传输性能的方法 技术领域
本发明涉及在LTE小基站系统中改进中继站传输性能的方法。
背景技术
LTE版本10引进空口信号中继，是LTE系统中的关键技术。LTE的中继是decode-and-forward(解码后前传)中继，就是中继站RN(Relay Node)把接收到的源基站DeNodeB(Donor eNodeB)的空口信号解码后重新编码再发送给终端(UE)。只能经过一个中继站RN把信号从源基站DeNodeB传给UE。从DeNodeB到RN的空口链路叫回程链路backhaul link定义为Un口，从RN到UE的空口接入链路叫Uu口。
带内中继(In-band relaying)是LTE系统中的一种重要中继类型。对于带内中继(In-band relaying)，回程链路、接入链路和直传链路都工作在相同的频谱上。一般情况下，为了避免中继站自身的接收端与发射端之间产生干扰，对于带内中继，规定回程链路和接入链路上不能同时进行下行或者上行的传输，而必须在时间上错开。因此，对于中继站来说，中继子帧分为回程子帧和接入子帧，中继站的回程链路下行和上行传输分别在下行和上行回程子帧上进行，接入链路下行和上行传输分别在下行和上行接入子帧上进行。对于下行回程子帧，中继站需要在该子帧前1或2个OFDM符号上进行接入链路的下行发射，并且在剩余可用资源上进行回程链路的下行接收。TD-LTE系统上下行子帧少，资源更紧张。
发明内容
本发明的目的在于提供一种在LTE小基站系统中改进中继站传输性能的方法，旨在解决上述问题。
为了实现上述目的，本发明的技术方案是设计一种在LTE小基站系统中改进中继站传输性能的方法，源基站DeNodeB根据信道状态信息CSI在层二L2信令中通过字段RN-SubframeCofig-r10配置TTI bundling；DeNodeB通过R-PDCCH中DCI调度新传一个下行数据，在TTI_BUNDLE_SIZE-1后的下行回程子帧重传；TTI_BUNDLE_SIZE在DeNodeB和RN中定义，重传的资源分配和新传一样；RN用bundle的最后的TTI上的PUCCH上的信息反馈。
本发明的优点和有益效果在于：本发明在回程下行链路使用TTI bundling传输下行信号，在无线信号差的条件下减少了传输延迟。将TTI bundling和中继Relay结合可以提高小区覆盖。在L2信令中配置TTI bundling可以避免UE重复解调下行数据，节省重传占用 的DCI资源。
具体实施方式
下面结合实施例，对本发明的具体实施方式作进一步描述。以下实施例仅用于更加清楚地说明本发明的技术方案，而不能以此来限制本发明的保护范围。
实施例：
一种在LTE小基站系统中改进中继站传输性能的方法，源基站DeNodeB根据信道状态信息CSI在层二L2信令中通过字段RN-SubframeCofig-r10配置TTI bundling；DeNodeB通过R-PDCCH中DCI调度新传一个下行数据，在TTI_BUNDLE_SIZE-1后的下行回程子帧重传；TTI_BUNDLE_SIZE在DeNodeB和RN中定义，重传的资源分配和新传一样；RN用bundle的最后的TTI上的PUCCH上的信息反馈。
以上所述仅是本发明的优选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明技术原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本发明的保护范围。

Claims (1)

  1. 在LTE小基站系统中改进中继站传输性能的方法，其特征在于：源基站DeNodeB根据信道状态信息CSI在层二L2信令中通过字段RN-SubframeCofig-r10配置TTI bundling；DeNodeB通过R-PDCCH中DCI调度新传一个下行数据，在TTI_BUNDLE_SIZE-1后的下行回程子帧重传；TTI_BUNDLE_SIZE在DeNodeB和RN中定义，重传的资源分配和新传一样；RN用bundle的最后的TTI上的PUCCH上的信息反馈。
PCT/CN2017/110774 2017-11-13 2017-11-14 在lte小基站系统中改进中继站传输性能的方法 WO2019090790A1 (zh)

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CN103108392A (zh) * 2011-11-10 2013-05-15 中兴通讯股份有限公司 中继节点物理下行控制信道的资源分配方法及装置
CN103379628A (zh) * 2012-04-17 2013-10-30 中兴通讯股份有限公司 基于传输时间间隔捆绑的资源分配方法及移动终端
CN103634918A (zh) * 2013-12-19 2014-03-12 武汉邮电科学研究院 LTE系统中TTI Bundling的资源分配方法

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CN103533575A (zh) * 2013-10-23 2014-01-22 苏州微站通信科技有限公司 在lte小基站系统中改进中继站传输性能的方法

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CN103634918A (zh) * 2013-12-19 2014-03-12 武汉邮电科学研究院 LTE系统中TTI Bundling的资源分配方法

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