Method and device for coordinated relay

Abstract

In a method for relaying deployment in a wireless communication system comprising a transmitting node with multiple antennas for communicating with at least one receiving node via at least two relay nodes, a data stream at the transmitting node is partitioned into at least two data substreams, each of which is beamformed and transmitted over a first link to a respective of the relay nodes; subsequently at least one restorable representation of each received substream is forwarded over a second link to the receiving node from the two relay nodes; and finally the received and decoded representations are multiplexed to form an output signal at the receiving node corresponding to the original data stream.

Description

technical field [0001] The present invention relates generally to communication systems and, in particular, to the deployment of relays in such systems. Background technique [0002] Future wireless and / or cellular systems are expected to either require increased coverage, support for higher data rates, or a combination of both. Additionally, it is expected that the cost aspects of constructing and maintaining the system will become more important in the future. As data rates and / or communication distances increase, there is also a need to address increased battery pack consumption. [0003] On the one hand the topology used for existing systems is being reconsidered, since it has hardly changed during the three generations of cellular networks. For example, it is well known that multi-hop (which is an example of another communication topology) offers the possibility to significantly reduce the path loss between communicating (relaying) entities, which can be of benefit to...

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Problems solved by technology

[0010] According to the Dohler scheme of the prior art, the superposition of multiple sub-stream signals is sent from the relay station to the receiver via multiple channels, but this is not an optimal solution in the sense that at a given input power (or energy) to achieve higher throughput

Also, there is no advice at all on how to choose relay stations

Also, in the Dohler scheme, no suggestion is made on how to distribute power among different relay stations in an efficient manner, i.e., all involved relay stations have equal power [5], [6]

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