Current regulations require that portable unlicensed devices operating in TV white space perform a channel availability query (CAQ) before transmitting whenever they move more than 100m. Since this mobility constraint gives rise to frequent CAQs, the Federal Communications Commission allows a region-based mobility procedure (RMP) to help reduce the number of CAQs. Since the performance of the RMP cannot be precisely evaluated based only on the number of CAQs, in this letter, we formulate an achievable throughput in terms of the average number of available channels, the effective data transmission time, and the TV band database fees. We discover that the achievable throughput for the conventional single RMP is degraded when the radius of the region is not properly determined. In order to alleviate this performance degradation, we propose a multi-RMP using multiple radii in order to obtain multiple available channel lists. Simulation results show that the proposed multi-RMP can mitigate the performance degradation. In addition, the use of multi-RMP enhances the maximum throughput compared to the single RMP.
Bibliographical noteFunding Information:
This work was supported in part by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (No. 2012R1A2A1A05026315), and in part by the MKE (The Ministry of Knowledge Economy), Korea, under the ITRC (Information Technology Research Center) support program supervised by the NIPA (National IT Industry Promotion Agency) (NIPA-2012-(H0301-12-1005)). Digital Object Identifier 10.1109/WCL.2012.081312.120314
All Science Journal Classification (ASJC) codes
- Control and Systems Engineering
- Electrical and Electronic Engineering