| 摘要: |
| 为了提高认知用户的接入效率，同时兼顾其QoS需求，提出了一种应用于认知无线网络的基
于业务区分的自适应MAC协议。对不同业务采取
不同的最优频谱检测时间，实时业务(RT)以最小化接入时延为目的确定最优的
频谱检测时间,而非实时用户(NRT)则以最大化吞吐率为目标确定最佳的频
谱检测时间。根据所确定出的最佳频谱检测时间，结合当前的业务到达速率和调度策略，不
同业务以时隙Aloha的方式接入空闲频谱。理论分析和仿真表明，所提出的自适应MAC协议能
够自适应地为认知用户的不同业务确定最优频谱检测时间，从而有效地提高频谱使用效率，
保证不同业务的QoS需求。 |
| 关键词: 认知无线网络 自适应MAC 业务区分 服务质量 频谱检测 |
| DOI：10.3969/j.issn.1001-893x.2013.07.011 |
|
| 基金项目:国家自然科学基金资助项目(61172071, 61102047)；陕西省自然科学基础研究项目(2011JQ8027); 陕西省教育厅科学研究计划项目（2013JK1064）；工信部通信软科学项目（2013-R-36-2） |
|
| A service-differentiated based adaptive MAC protocol for cognitive radio networks |
| JIANG Fan,LU Guang-yue |
| () |
| Abstract: |
| To improve the access efficiency of secondary users(SU) and consider their QoS r
equirements at the same time,a service-differentiated based adaptive Media Acce
ss Control(MAC) prot
ocol is proposed for cognitive radio networks. Specifically, real time services
determine the best spectrum sensing time aiming at minimizing the spectrum acces
s time,while users with non-real time services select proper spectrum sensing tim
e to obtain maximum throughput. Combined with service arriving rate and schedulin
g policy, different services adopt slotted Aloha for medium access. Theoretical
analysis and simulation results demonstrate that the proposed MAC protocol can a
daptively adjust optimal spectrum sensing time for different type of services, s
o as to achieve higher spectrum utilization rate and ensure user′s Quality o
f Service(QoS) as well. |
| Key words: cognitive radio network adaptive medium access control service differentiating Quality of Service spectrum detect |
