| Due to the ever increasing of CDMA subscribers, all infrastructure/service providers are accelerating their investigation to map out plans to handle the increasing capacity demand. In the AMPS and TDMA technology, cell splitting has been one of the standard practices 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, new methods are required to handle localized hot spots. Previously, it was reported [1] that there is an optimum sectorization scheme for CDMA base station to provide higher capacity.; Nevertheless, even though higher sectorization scheme benefits from the ubiquitous soft handoff, the shrinkage of the RF footprint on a per sector basis gives rise to more frequent maintenance handoff. Higher sectorization also increases the intercell interference level of the system, and capacity gain from higher sectorization will experience diminishing return. Also, higher sectorization scheme suffers from the lack of trunking efficiency offered in the multiple carrier deployment.; Multiple carriers deployment means laying additional carriers over each other. This deployment scheme preserves identical RF footprint of the cell in the core area. However, due to the lack of soft handoff gain in the reverse link, the RF footprint among the sectors facing out-bound of the overlaying carrier will contract substantially. Furthermore, imbalance of the forward and reverse links results in the "grey zone" issue. This scheme also requires hard handoff to direct traffic from the overlaying secondary carrier to the primary carrier when subscribers roam out-bound. From a capacity standpoint, even an un-orchestrated multiple carriers deployment multiplies the capacity of the network. With intelligent resource allocation scheme, the operation among multiple carriers can be intelligently managed to increase the trunking efficiency of the network. It results in higher aggregated Erlang capacity and better system redundancy.; This traffic management scheme also works in the multi-mode scenario where different modes of technologies overlaying in the same geographic area. With intelligent resource management technique and multi-mode mobiles, it provides a graceful migration path from AMPS to CDMA, or GSM to CDMA. A multi-mode deployment will be studied.; In the fixed wireless application, all subscribers will be stationary in a fixed location. It is not required to have a homogenous frequency in the coverage area. Deployment of isolated cells with different carriers, in fact, will minimize the inter-cell interference and improve the overall air interface capacity. A frequency plan for FWA will be introduced and analyzed. |
