Abstract:

A hybrid cooperative relay selection algorithm (HCRSA) is presented for relay based cellular networks. According to current user density in a certain cell, when twohop transmission mechanism is adopted, HCRSA will be adapted selectively between two different cooperation schemes. These are realized either between the parallel transmission between the base station and a relay node or by adopting parallel transmission between another mobile terminal and relay node. Simulations demonstrate that, compared with fixed relay selection schemes, HCRSA can dynamically choose different cooperative strategies according to current user condition in the cell by fully utilizing cooperative communication so as to increase effectively the user capacity and as to improve system performance as well.

Key words: Relay selection, relay cellular network, cooperative relay, cooperative diversity