CAC Policies in Heterogeneous Wireless Cognitive Networks
Although call admission control (CAC) issues in various networking scenarios have been under investigation for many years now, the specific CAC requirements brought about by heterogeneous wireless cognitive networks have not been vigorously addressed. In cognitive network context, one wireless network can rent idle radio spectrum from (or out to) other wireless networks. In this paper for the first time, we recommend that the CAC policies should be distinguished between primary users and secondary users. The classification of different methods of CAC policies in cognitive networks contexts is proposed. Then, the adaptive reservation threshold CAC algorithm for Primary Users and the rented threshold CAC algorithm for Secondary Users are analyzed respectively. The reservation threshold presented in this paper is adaptive to the current total number of channels. When the rented channels increase, the current total number of channels decreases, the reservation threshold for hand-off calls should also be decreased to avoid high new call blocking probability. For SUs networks, the setting of the rented threshold helps decrease the new call setup delay brought by the channels rented and also keeps the handoff call dropping probability and the withdrawal dropping probability smaller.
cognitive network call admission control (CAC) primary users secondary users heterogeneous networks
Xiuhua Fu Jiazheng Wang
School of Computer Sci&Tech Shandong University of Technology Zibo,Shandong Province,China,255049 School of Science Shandong University of Technology Zibo,Shandong Province,China,255049
国际会议
太原
英文
25-28
2011-02-26（万方平台首次上网日期，不代表论文的发表时间）