摘要
在认知无线电中,由于次用户会因为错误感知未能发现主用户而接入信道,从而造成主次用户的冲突碰撞,而且竞争同一信道的次用户越多,冲突碰撞的概率越大。提出了基于联盟的MAC协议(ALLY-MAC),合理分配竞争各信道的次用户数量,从而减少与主用户发生冲突碰撞的可能性,提高网络吞吐量。通过仿真实验可看出,与OSA-MAC的接入机制相比较,所提方案能有效地减少主次用户之间的冲突碰撞率,提高网络吞吐量。
In cognitive radio networks, collision occurs when the secondary user fails to detect the presence of primary users and may access the channel. The more is the number of the secondary users in contention of the same channel, the higher is the collision probability. An alliance-based access method is proposed to rationally allocate the number of secondary users in contention of each channelso as to reduce the conflicts between primary users and secondary users. The mechanisms of OSA-MAC and ALLY-MAC were compared by simulation. The results show the improvement brought by ALLY-MAC in terms of conflict decrease and system throughput increase.
出处
《南京邮电大学学报（自然科学版）》
2010年第2期66-70,共5页
Journal of Nanjing University of Posts and Telecommunications：Natural Science Edition
基金
国家高技术研究发展计划(863计划)(06KJA51001)
江苏省高校自然科学重大基础研究项目(2009AA01Z241)资助项目
关键词
认知无线电
机会频谱接入
联盟
信道分配
cognitive radio
opportunistic spectrum access
alliance
channel allocation
