Abstract
Relaying is one of the enabling techniques for next generation systems. Factors deciding on performance of relay-enhanced systems are the resource allocation and coordination. The capacity of the wireless relay backhaul link is typically the bottleneck of transmissions conveyed through the relay node. It can be to some extent improved by allocating dedicated resources; however, typically this is done at the expense of the performance of users served directly from the base station. To achieve optimum overall performance, resource assignment to relays and users has to be done carefully. This article addresses the problem of resource allocation with relays operated in multi-carrier scenarios. Guidelines for optimization of the resource allocation under the resource fair policy are given with different relay configurations, including time, frequency, and hybrid resource partitioning schemes. Finally, advanced resource coordination procedures are presented. Multi-carrier interference coordination is proposed for improving the quality of radio links, and carrier load balancing for improving the efficiency of resource utilization.
Highlights
The concept of a three-node communication channel was first proposed by van der Meulen [1]
Resource partitioning in multi-carrier systems In a relay-enhanced system, three types of links coexist: direct (DeNB-user equipment (UE)), backhaul (DeNB-RN), and access (RN-UE)
If a more realistic finite buffer traffic model is assumed, it is required to consider that the UEs with lower spectral efficiency (SE) require more time to transfer a certain amount of data, than the UEs with higher SE. This implies that, following the analysis presented in [20], the Avg(SE(r,u)) is asymptotically inter-RN interference occurs only between access links; (c) resources used for backhaul link of some RNs reused for access links of other RNs, and vice versa, inter-RN interference occurs between the access links as well as between access and backhaul links
Summary
The concept of a three-node communication channel was first proposed by van der Meulen [1]. 3. Resource partitioning in multi-carrier systems In a relay-enhanced system, three types of links coexist: direct (DeNB-UE), backhaul (DeNB-RN), and access (RN-UE). It is estimated that the total overhead of the in-band relaying in the case of 10 RNs per DeNB cell is at the level of 12% of the wireless backhaul link capacity [40].
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