A TCDMA protocol for next-generation wireless cellular networks with bursty traffic and diverse QoS requirements

In this paper, we propose the heterogeneous CDMA (H-CDMA) protocol, a time code division multiple access (TCDMA) protocol consisting of the centralized single-allocation function (CSF), the centralized multipleallocation function (CMF), and the distributed multiple-allocation function (DMF). CSF or CMF can achieve high throughput and support differentiated service quality in conventional cellular networks without relaying capability or dynamic cellular networks with multihop relaying capability, respectively, while CSF combined with DMF can transform a conventional cellular network into a dynamic cellular network. Moreover, DMF can considerably increase the scalability and effi ciency of CMF by employing them concurrently. H-CDMA is designed for medium access control (MAC) in 4G wireless systems that integrates cellular networks, ad hoc networks, and wireless LANs, and provides an evolutionary path from the third-generation (3G) wireless systems to the G and the fourth-generation (4G) wireless networks such as ad hoc cellular networks (ACENETs).