Abstract
Sharing a multiantenna relay among several sectors is a simple and cost-effective way to achieving much of the gains of local interference mitigation in cellular networks. Next generation wireless systems, such as ones based on the Third Generation Partnership Projects Long-Term Evolution Advanced, will employ universal frequency reuse to simplify network deployment. This strategy is anticipated to create significant cell-edge interference in the location of the shared relays, thus rendering advanced interference management strategies a necessity. This paper proposes several interference management strategies for the shared relays ranging from simple channel inversion at the relay, to more sophisticated techniques based on channel inversion in combination with partial and full base station coordination in the downlink and uplink. Given that the relay functionality influences total interference, both amplify-and-forward and decode-and-forward type relays are considered throughout. In this context, channel cancelation techniques are investigated for one-way relaying and also the spectrally efficient two-way relaying protocol. Simulations show that strategies based on two-way shared relaying with bidirectional channel inversion at the relay often perform best in terms of total system throughput while one-way techniques are promising when the relay power is low.
Highlights
The IEEE 802.16j wireless standard was one of the first commercial standards to embrace the use of relay terminals within a cellular network [1]
Regardless of the scheme, we are interested in the uplink and downlink sum rate performances of the schemes in the sectors of interest which are sectors in which all three base stations share with the relay
Since we are concerned about interference management schemes, the network transmit powers will dictate interference powers throughout the network that prominently influence the performance
Summary
The IEEE 802.16j wireless standard was one of the first commercial standards to embrace the use of relay terminals within a cellular network [1]. The shared relay concept exhibited a kind resiliency to interference very much desired from a systems design perspective (see, e.g., Figure 8 of [7]) These benefits, come at the expense of increased complexity both at the relays, to perform successive interference cancelation, and at the base stations, to perform dirty paper coding. The relay has the potential, for example, to distribute its available resources (such as power) differently between the uplink and downlink streams as it broadcasts its common message in the third phase (time slot) The details of this process will become apparent in the two-way relaying section.
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