| Personal communication system (PCS) has stimulated broad interest among researchers and practitioners, and foreseen the huge market potential. In order to achieve efficient and fair utilization of the precious system resources, one of the major technical challenges is the design of good multiple access (MA) schemes. According to the amount of coordination needed in the resource sharing, MA schemes can be categorized into three types, namely, random access, fixed assignment, and demand assignment. Among them, demand assignment, particularly, based on resource reservation, has obtained a lot of attention due to its flexibility and efficiency.; In this dissertation, we first address a unified performance model for existing reservation-type MA schemes and compare their performance under the integrated voice and data traffic scenario. The major purpose of this performance study is to gain some insight into those protocols and investigate the possibility of further improving their efficiency.; In light of the advantages and disadvantages of those existing reservation-type MA schemes, a novel protocol, called Dynamic Reservation Multiple Access (DRMA), is proposed. DRMA attempts to preserve the nice features of existing protocols and overcome their shortcomings. Our numerical results indicate that DRMA provides superior performance under a wide range of traffic scenarios.; To support the multimedia traffic in PCS, i.e., the integrated Variable Bit Rate (VBR), Constant Bit Rate (CBR), Available Bit Rate (ABR) traffic, another novel protocol, called Dynamic TDMA with Piggybacked Reservation (D-TDMA/PR), is presented. To account for the different characteristics of the integrated traffic, we propose two levels of reservation. The first level takes care of the real-time delivery requirement of VBR and CBR traffic, and the bursty feature of ABR traffic. Meanwhile, the second level reservation is designed to deal with the dynamic nature of VBR traffic. It is demonstrated in the numerical results that D-TDMA/PR provides better performance than existing protocols under the multimedia traffic scenario.; In addition, to study the system behavior in fading channels, a physical layer model is developed to evaluate the packet error probabilities considering fading, shadowing, and capture effect. As an example, the data link layer performance of PRMA has been studied by taking the channel characteristics into account in order to demonstrate the severe impact of channel errors. |
