Uplink Transmission Method of Relay Backhaul Link

Abstract

The present invention provides a method for uplink transmission of a relay backhaul link, the method comprising: the relay node receives the downlink control information carried on the physical downlink control channel PDCCH of the backhaul link sent by the base station in the wireless subframe n, And after the wireless subframe n, the kth wireless subframe n+k sends backhaul uplink services carried on the PUSCH corresponding to the downlink control information to the base station. The above method can flexibly and dynamically configure the uplink transmission of the backhaul link, avoid mutual interference with the uplink transmission of the access link, and can be better compatible with existing systems.

Description

technical field [0001] The invention relates to wireless communication technology, in particular to an uplink 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 ...

AI Technical Summary

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 backhaul link design, 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, and 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

Images