Multi-hop relay path selection method and system

Abstract

The invention discloses a multi-hop relay path selection method and a multi-hop relay path selection system. The method comprises the following steps of: detecting each path which passes a source node, a relay node and a sink node in sequence and the channel capacity and error rate of each path by using the sink node; determining a transmission path set and an optional path set; transmitting information of the optional path set to the source node by using each path in the transmission path set; judging whether an available path exists by using the source node; and if the available path exists, transmitting path selection confirming information to the sink node and transmitting data between the source node and the sink node. According to the method and the system, the single-hop channel capacity and error rate are considered comprehensively, so that the performance of an entire finally selected path is optimal. Moreover, bidirectional performance is considered, so that the bidirectional performance of the selected path can be optimized simultaneously.

Description

technical field [0001] The present invention relates to an LTE evolution (LTE-Advanced, LTE-A) system, in particular to a multi-hop relay path selection method and system. Background technique [0002] Relay, as a candidate technology for next-generation communication including LTE-A, can expand base station coverage and improve local capacity, and has attracted attention and research in recent years. The idea of ​​cooperative diversity makes the relay develop from simple amplification and forwarding to a more advanced direction. The 3GPP organization explained the classification of the relay in its R9 36-814 document, and gave its system-level simulation parameters. [0003] Although 3GPP regards relay as a candidate standard for next-generation communication, it has not yet introduced more than two-hop relay into the standard, and most current research is still within the range of two hops. [0004] figure 1 It is a schematic diagram of the existing relay model. [0005...

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Problems solved by technology

[0010] (2) Based on the two-hop mode, the multi-hop model is simplified to a two-hop model, and then directly selected according to the selected relay selection algorithm, but this algorithm only performs local optimization, without considering whether the entire path is optimal , followed by an example

[0013] It can be seen that currently, when selecting a path in a multi-hop relay, only whether the next hop is the optimal path is considered, and the performance of the overall path is not considered.

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