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

Abstract

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

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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References 15

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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

Cognitive network spectrum access for emergency communications

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