Downlink Transmission Method of Relay Backhaul Link

Abstract

The invention proposes a downlink transmission method of a relay return link. The method includes the following steps: a relay node receives at a wireless subframe m return downlink control information sent by a base station and borne on a Physical Downlink Control Channel (PDCCH) of a return link, and receives at the ith wireless subframe m+i behind the wireless subframe m a return downlink service which is sent by the base station, is borne on the Physical Downlink Sharing Channel and corresponds to the downlink control information. The abovementioned method can flexibly and dynamically configure uplink transmission of the return link, avoids mutual interference with uplink transmission of an accessed link, and can be well compatible with an existing system.

Description

technical field [0001] The invention relates to communication technology, in particular to a downlink transmission method of a relay backhaul link. Background technique [0002] In an LTE (Long Term Evolution, long-term evolution system) system, LTE-A (LTE-Advanced, an advanced long-term evolution system) is an evolved version of the LTE. A characteristic of the LTE-A system is that a relay node (Relay Node, RN) is introduced into the system. The introduction of the relay station improves the coverage quality and coverage of the signal to a certain extent, and increases the system capacity. The purpose of introducing the relay is to improve system coverage and system capacity, provide flexible network deployment and reduce network construction costs. The main application scenarios include: hotspot coverage, blind filling, indoor coverage, rural coverage, emergency communication, wireless backhaul and group mobility, etc. [0003] As a special node, the relay node RN is bo...

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Problems solved by technology

[0006] 1. In order to avoid the impact on the existing HARQ timing and process, the existing downlink backhaul is selected to be performed on the MBSFN subframe, which is a semi-static configuration, and the time point of data transmission is very limited, which affects the delay of data forwarding. Therefore, the effect is not good for real-time business

[0007] 2. At the same time, due to the limited number of frames used for backhaul, under the maximum configuration of the existing protocol, only a wireless frame can only use a maximum of 3 MBSFN subframes for backhaul downlink, and a maximum of 2 uplink subframes can be used for backhaul uplink, and its resources are limited. Limit, resulting in the transmission rate of backhaul must be limited

[0008] 3. In the design of the backhaul link, in order to save channel resources, the PHICH channel is removed. As a result, the uplink backhaul cannot perform uplink synchronous non-adaptive HARQ retransmission, but can only perform adaptive HRAQ retransmission with uplink authorization, which also increases Resource pressure of PDCCH channel

[0009] 4. The resource allocation method of the R-PDCCH of the existing backhaul does not adopt the CCE allocation method of the original PDCCH, which not only leads to the redefinition and design of the resource allocation method of R-PDCCH transmission authorization, but also leads to PUCCH related to downlink transmission The resource mapping method of feedback resources needs to be redefined

Obviously, the backhaul design in the relay scenario in the existing 4G technology is difficult to meet the requirements

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