Dynamic resource allocation for handoff using MC-CDMA in wireless ATM networks

Adapted Queuing Priority Algorithm for Soft Handoff in Mobile Communication Networks

“…The system throughput was obtained by considering the effective data rate of users, including the data packet header, for BSA during the simulation time over 8 hours. The transmission order of packets was determined using MC-CDMA technology and the basic optimized cellscheduling algorithm (OCSA) discipline with BER scheduling [17]. Figure 10 clearly reveals noticeable differences among the simulation results of the four algorithms.…”

“…CBR, VBR and ABR traffic types were employed, and the spreading factor of MC-CDMA system was set to 128. Table 1 summarizes the system parameters for the MS handoff process used in the simulation, while Table 2 lists the parameters for different traffic types [17]- [18]. The performance of the handoff call dropping ratio, which is the most significant problem, are first addressed.…”

“…The system automatically runs the EQPA procedure when an event occurs. The packet dispatching discipline employs the DRAM scheme [17]. The pseudorandom code of EQPA procedure is shown as follows Fig.…”

“…Three conventional traffic types, constant bit rate (CBR), variable bit rate (VBR), and available bit rate (ABR) are selected in the MC-CDMA environment. EQPA adopts the existing bandwidth allocation mechanism [16]- [17], programming in advance and queuing priority model to lower the probability of dropping handoff calls. Additionally, EQPA employs a back and front handoff queuing module to arrange for handoff calls with different signal strengths, raising the handoff threshold and decreasing the occurrence of needless handoff action.…”