Frequency allocation in two-hop cellular relaying networks

Frequency allocation is a critical issue for cellular relaying networks. In this paper we present spectrum-efficient frequency allocation policies that are applicable for fixed two-hop cellular relaying networks. The frequency allocation problem is decomposed into two sub-problems: inter-cell and intra-cell frequency allocation. The goal is to make more users to be served with satisfactory service quality. Through numerical analysis, the basic inter-cell frequency allocation scheme is proposed, including frequency reuse pattern and reuse factors for each type of links. Then we propose a method to realize safe intra-cell frequency reuse, in the sense that higher spectrum efficiency is achieved through this tighter frequency reuse while the signal-to-interference (SIR) quality for the links of concern is still guaranteed. Simulations show that our schemes are beneficial to obtain more satisfied users and low outage ratio, when compared to the cases without intra-cell frequency reuse scheme and the cases with fixed intra-cell frequency reuse scheme.