支持紧急通信的无线认知网络频谱接入方法

doi:10.3969/j.issn.1000-436x.2012.z2.025

摘要/Abstract

摘要：

提出了支持应急通信的无线认知网络机会频谱接入模型。首先按照离散时间完全和限定(k=1)服务两级轮询策略实现主用户和次用户对频谱的共享。其次，通过在数据确认中捎带轮询列表信息方式实现数据传输和用户调度的并行处理，减少用户切换造成的时延浪费。通过建模分析得出网络吞吐量及用户平均等待时延的精确解析，结果表明本方案能有效抑制次用户对主用户通信质量的影响，又能增加网络吞吐量并为通信业务提供时延保障。

关键词: 机会频谱接入, 时延保证, 无线认知网络, 应急通信

Abstract:

A wireless cognitive network opportunistic spectrum accessing scheme which provided delay guarantee for emergency communications was proposed.Primary user (PU) and secondary users (SU) shared the spectrum resources according to the discrete time two-level exhausted and limited (k=1) polling mechanism.Then,piggyback acknowledgement was used to realize the parallel scheduling between data transportation and users access,and then reducing the time consumption cause by the user switching.Finally,the mathematics functions was set up and achieved the closed form expressions for the mean waiting time theoretical analysis and simulation experiment.It is proved that the proposed scheme is both interference restraining and high throughput with the delay guaranteed.

Key words: opportunistic spectrum access, delay-guaranteed, wireless cognitive network, emergency communications

官铮,钱文华,虞美乐. 支持紧急通信的无线认知网络频谱接入方法[J]. 通信学报, 2012, 33(Z2): 182-188.

Zheng GUAN,Wen-hua QIAN,Mei-le YU. Cognitive network spectrum access for emergency communications[J]. Journal on Communications, 2012, 33(Z2): 182-188.

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参考文献 15

[1]	CLAUDIA C , KAUSHIK R C . A survey on MAC protocols for cognitive radio networks[J]. Ad Hoc Networks, 2009,7(7): 1315-1329.
[2]	顾成杰, 张顺颐, 孙雁飞 . 基于业务感知和策略选择的认知路由算法[J]. 通信学报, 2011,32(11): 168-175. GU C J , ZHANG S Y , SUN Y F . Cognitive network routing algorithm based on service awareness and policy choice[J]. Journal on Communications, 2011,32(11): 168-175.
[3]	MASKERY M , KRISHNAMURTHY V , ZHAO Q . Decentralized statistic spectrum access for cognitive radios:cooperative design of a non-cooperative game[J]. IEEE Transactions on Communications, 2009,57(2): 459-469.
[4]	CHEN Y , ZHAO Q SWAMI A ,et al. Distributed spectrum sensing and access in cognitive radio networks with energy constraint[J]. IEEE Transactions on Signal Processing, 2009,57(2): 783-797.
[5]	CHEN Y , ZHAO Q . Joint design and separation principle for opportunistic spectrum access in the presence of sensing errors[J]. IEEE Transactions on Information Theory, 2008,54(5): 2053-2071.
[6]	ZHAO Q , TONG L , SWAMI A ,et al. Decentralized cognitive MAC for opportunistic spectrum access in ad hoc networks:a POMDP framework[J]. IEEE JSAC:Special Issue on Adaptive,Spectrum Agile and Cognitive Wireless Networks, 2007,25(3): 589-600.
[7]	孙君, 朱洪波 . 物联网距离和业务特征结合的频谱接入方法[J]. 通信学报, 2012,33(4): 25-30. SUN J , ZHU H B . Opportunistic spectrum accessing joint distance with service characteristics in IOT networks[J]. Journal on Communications, 2012,33(4): 25-30.
[8]	孙君, 朱洪波 . Ad Hoc网络中基于距离的机会频谱接入方案[J]. 电子学报, 2011,39(7): 1679-1682. SUN J , ZHU H B . Opportunistic spectrum access based on distance over ad hoc networks[J]. Acta Electronic Sinica, 2011,39(7): 1679-1682.
[9]	CHEN Q , LIANG Y C . A two-level MAC protocol strategy for opportunistic spectrum access in cognitive radio networks[J]. IEEE Transactions on Vehicular Technology, 2011,60(5): 2164-2180.
[10]	MOHAMMAD M R , Md J H , EKRAM H ,et al. Opportunistic spectrum access in cognitive radio networks:a queueing analytic model and admission controller design[A]. Global telecommunications conference,GLOBECOM’07[C]. Washington,DC,USA, 2007. 4647-4652.
[11]	GUAN Z , ZHAO D F , ZHAO Y F . A discrete time two-level mixed service parallel polling model[J]. Journal of Electronics, 2012,29(1/2): 103-110.
[12]	LIU Q L , ZHAO D F . Analysis of two-level-polling system with mixed access policy[A]. IEEE International Conference on Intelligent Computation Technology and Automation[C]. Changsha,China, 2009. 357-360.
[13]	杨志军, 赵东风, 丁洪伟 ,等. 两级优先级控制轮询系统研究[J]. 电子学报, 2009,37(7), 1452-1456. YANG Z J , ZHAO D F , DING H W ,et al. Research on two-class priority based polling system[J]. Acta Electronica Sinica, 2009,37(7): 1452-1456.
[14]	LIANG Y C , ZENG Y , PEH E C Y ,et al. Sensing-throughput tradeoff for cognitive radio networks[J]. IEEE Transactions on Wireless Communications, 2008,7(4): 1326-1337.
[15]	CHEN Q , GAO F , NALLANATHAN A ,et al. Improved cooperative spectrum sensing in cognitive radio[A]. IEEE VTC-Spring ’08[C]. Singapore, 2008. 1418-1422.

网络类型	λ_s	吞吐量T	E[W_p]	E[W_s]
传统网络	—	0.5	0.166 7	—
认知网络	0.005	0.55	0.166 7	11.722 2
	0.01	0.6	0.166 7	13.250 0
	0.015	0.65	0.166 7	15.214 3
	0.02	0.7	0.166 7	17.833 3
	0.025	0.75	0.166 7	21.500 0
	0.03	0.8	0.166 7	27.000 0
	0.035	0.85	0.166 7	36.166 7
	0.04	0.9	0.166 7	54.500 0

网络类型	N	吞吐量T	E[W_p]	E[W_s]
传统网络	—	0.5	0.166 7	—
认知网络	1	0.52	0.186 7	1.625 0
	2	0.54	0.206 7	2.847 8
	4	0.58	0.246 7	5.642 9
	6	0.62	0.286 7	9.026 3
	8	0.66	0.326 7	13.205 9
	10	0.7	0.366 7	18.500 0
	15	0.8	0.466 7	41
	20	0.9	0.566 7	108.500 0

网络类型	N	吞吐量T	E[W_p]	E[W_s]
传统网络	—	0.5	0.166 7	—
认知网络	1	0.51	0.166 7	1.540 8
	2	0.52	0.166 7	2.625 0
	4	0.54	0.166 7	4.934 8
	6	0.54	0.166 7	7.454 5
	8	0.58	0.166 7	10.214 3
	10	0.6	0.166 7	13.250 0
	15	0.65	0.166 7	22.357 1
	20	0.7	0.166 7	34.500 0