Capacity growth for CDMA system: multiple sectors and multiple carriers deployment

Due to the increasing acceptability of CDMA, all infrastructure/service providers are accelerating their investigation to map out strategies to handle the increasing capacity demand. In the AMPS/TDMA technology, cell splitting has been one of the standard practices to improve the frequency reuse factor in order to increase capacity. Furthermore, dynamic channel/resource allocation has been demonstrated to provide capacity relief in localized hot spots. In the CDMA technology, however, since the conventional AMPS/TDMA frequency planning is not required, there are new strategies to increase capacity. Previously, Wong and Prabhu (see IEEE VTC, p.1177-81, 1997) had investigated the optimum sectorization scheme for a CDMA base station to provide higher capacity. Multiple carriers deployment provides another option. From a capacity standpoint, even an un-orchestrated multiple carriers deployment multiplies the capacity of the network. With an intelligent resource allocation scheme, the traffic loading among multiple carriers can be intelligently managed to increase the trunking efficiency of the network. It results in much higher aggregated Erlang capacity and better system redundancy