Uplink Capacity Enhancement In Two-Hop Cellular Networks With Limited Mobile Relays

This paper studies system uplink capacity in multi-hop cellular networks with mobile nodes as relays. And according to simulation and analysis results, author provides an enhanced architecture in CDMA Two-Hop Cellular Networks (THCN) with relay capability limitation. We analyze the real relay capability request in the general layered multi-hop cellular networks, which provide relay capability is an indispensable factor when set up a multi-hop cellular system. Simulations show that mobile and fixed relay capability limitation will decide the enhancement of system uplink capacity. We provide the maximum system uplink capacity in a CDMA THCN cell. And then compare the different scenarios with lack of relay capability in uplink, we get single-hop mobile user percentage should be 10-40% if there is no or less fixed relay nodes. Considering detects of the general architecture, we propose a new enhanced architecture, which is more effective with relay capability limitation. Simulation results show that it will enhance the system uplink capacity by about 21.4%, while about 17% with relay limitation. Simulation also shows that when enlarging single-hop user area, the total system capacity will be kept and the sending power in uplink will be saved.