Relay station for a mobile communication system

Abstract

A relay station (100) for being operative in a mobile communication system, comprising a receiver (110) for receiving a radio signal from a source, the radio signal comprising symbols representing an encoded information, the encoded information being based on an encoding rule and comprising payload information and redundancy information. The relay station (100) comprising a soft detector (120) for detecting a symbol from the radio signal to obtain soft information, the soft information comprising information on the symbol and reliability information on the information on the symbol. The relay station (100) further comprising a quantizer (130) for quantizing the soft information to obtain quantized soft information and a transmitter (140) for transmitting an information on the quantized soft information to a destination.

Description

technical field [0001] The present invention relates to the field of wireless communication in mobile communication systems using relay stations. Background technique [0002] Traditional relay concepts include, for example, standard relay methods as amplify-and-forward relays and decode-and-forward relays, respectively. While amplify-and-forward relays have low latency at the expense of noise amplification, decode-and-forward relays cause processing delays at the relay station due to decoding. Furthermore, decoding errors at the relay station have detrimental effects on the decoding at the destination. [0003] The designated purpose of a relay station in a wireless network is to facilitate the transmission of other users within the same cell, and one of the important benefits is to provide cooperation diversity, such as A.Sendonaris, E.Erkip and B.Aazhang, "Increasing uplink capacity via user cooperationdiversity "(in Proc. IEEE Int. Symp. on Information Theory, 1998). ...

AI Technical Summary

Problems solved by technology

However, the direct relay method results in a capacity penalty factor of 0.5, since slots must be split into two hops

Another problem is the processing delay in the repeater, which leads to an intolerable increase in the round-trip delay due to the decoding at the repeater according to the above concept

Another amplify-and-forward relay approach that circumvents the decoding delay at the relay station incurs lower processing latency, but these schemes suffer from noise amplification in the repeater

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