A Cross Layer Time Slot Reservation Protocol for Wireless Networks

The function of medium access control (MAC) protocol and the capacity of physical layer sufficiently affect the system performance in the wireless networks. In this research, we propose a MAC protocol based on direct sequence code division multiple access (DS-CDMA) for the wireless networks to guarantee quality-of-service (QoS) which depend on physical layer information, named the cross layer time slot reservation (CLTSR) protocol. A channel is divided into control and data channels to transmit control and data packets in the corresponding control and data frames, respectively. The data frame is further subdivided into several time slots; each time slot can transmit different traffic types such as constant bit rate (CBR), variable bit rate (VBR), and available bit rate (ABR). Each station maintains the available spreading code (ASC) table to understand which time slots and spreading codes have been reserved. CLTSR will allocate time slots and the spreading code for the data frame by using the fixed time slot allocation (FTSA) or the mixed time slot allocation (MTSA). The QoS can be guaranteed by providing the reservation of time slots and the spreading code. A Markov model is applied to analyze the CLTSR DS-CDMA system; the analytical and simulation results show that the proposed CLTSR performs has been improved.