Configuration and indication method of relay sub-frames as well as method and system for realizing relay transmission

Abstract

The invention provides a configuration and indication method of relay sub-frames as well as a method and system for realizing relay transmission, wherein the methods and system provided by the invention are applied to a TDD (time division duplex) system comprising at least one base station and a relay station. The configuration method comprises the following steps: aiming at uplink and downlink configurations on used sub-frames, creating one or more relay sub-frame configuration sets for carrying out uplink and downlink communications between the base station and the relay station; and forming a sub-frame combination by an uplink sub-frame and each downlink sub-frame in the same relay sub-frame configuration set, wherein the sub-frame combination is one of combinations of uplink sub-frames and downlink sub-frames for downlink service transmission and corresponding uplink ACK (acknowledgement)/NACK (negative acknowledgement) feedback information transmission under the uplink and downlink configuration of the sub-frames defined in TDD LTE (long term evolution) Release-8. The invention also provides a corresponding indication method as well as a method and system for realizing the relay transmission. The relay station is used in the system, thus ensuring the backward compatibility for terminals.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a method for configuring and indicating a relay subframe, and a method and system for realizing relay transmission. Background technique [0002] At present, the development of mobile communications requires support for higher transmission rates, better signal coverage, and higher resource utilization. In order to achieve a higher transmission rate, the next-generation mobile communication system will use a higher frequency bandwidth to transmit signals, and a higher frequency bandwidth will bring greater path loss at the same time, affecting network coverage. The relay (Relay) technology can increase the coverage and balance and increase the throughput of the cell, and the relay station has a relatively small configuration cost compared with the base station. Therefore, the relay is regarded as a long-term evolution (Long Term Evolution, referred to as LTE) The e...

AI Technical Summary

Problems solved by technology

However, due to the structure of the uplink backhaul subframe itself, the relay station is in the transmitting state of the uplink backhaul subframe and cannot receive the uplink ACK / NACK feedback information sent by the subordinate terminal, so the transmission timing of the downlink service and the corresponding uplink ACK / NACK feedback information is different. The backhaul subframe configuration has an important impact

In addition, in the TDD system, it is stipulated that the downlink subframes except subframes 0, 1, 5, and 6 can be configured as MBSFN subframes, and there are fewer uplink subframes in some subframe uplink and downlink configurations, so it is difficult to guarantee The configuration of the uplink backhaul subframe does not affect the transmission of access link downlink services and corresponding uplink ACK / NACK feedback information

The above problems make the backhaul subframe configuration in the TDD system more complicated

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