Radio Resource Management for WCDMA Networks Supporting Smart Radio Terminals



Implementation of advanced radio concepts in the terminal is one of the potential techniques that can significantly increase the downlink capacity of WCDMA terrestrial cellular networks. In order to achieve a capacity increase in a cellular network, two factors are required. First, the receivers have to be upgraded to obtain a link level improvement. Second, the radio resource management algorithms must be able to automatically capture the capacity gain. Under the assumption that the network has no knowledge about the use of advanced terminal receivers, the capability of power based radio resource management algorithms to capture the capacity gain when a certain proportion of terminals implements advanced receivers is analysed both theoretically and by means of dynamic network simulations. The outcome of this study is that current power based radio resource management algorithms are able to capture this capacity gain without any modification. Moreover, this capacity gain depends on the type of advanced receiver, the multi-path channel profile, the block error rate target (BLER) and the soft handover settings. Simulations were conducted with both dual antenna Rake and dual antenna linear interference cancellation receivers. In both cases, the overall capacity of the network is doubled when at least 80 % of users deploy advanced receivers. When circuit switched traffic is considered, the network uses the extra capacity to serve more users at the same time. The same occurs when packet traffic on dedicated channels is served with a Round Robin strategy that is not aware of the spectral efficiency of each user. However, when packet traffic is served on time-multiplexed channels in such a way that link adaptation is conducted to allocate the maximum possible bit rate for a certain average allocated transmit power, the outcome is different. In this case, the network allocates more bit rate to those users deploying an advanced receiver. (Juan Ramiro Moreno, Preben E. Mogensen; Klaus I. Pedersen, Nokia)
Effektiv start/slut dato31/12/200331/12/2003