基于可靠多播通信的分布式无线信道最优接入方法研究

doi:10.11959/j.issn.2096-3750.2022.00290

Abstract

Abstract:

To address the low spectrum utilization issue of the distributed network due to multi-user collision and channel time-varying nature, the distributed channel access problem for multicast communication was investigated.Based on the optimal stopping theory, a statistical model of distributed channel access under wireless multicasts was established, and an optimal distributed wireless channel access method under reliable multicast communication was proposed.Each source competes for the channel in a distributed manner, the winner source determines whether to access the shared channel by comparing the reliable multicast access rate with a pure threshold to complete the reliable multicast communication from the winner source to all the sinks.Theoretic optimality of the method was proved rigorously.A corresponding low-complexity algorithm was designed, which has a pure threshold structure and good engineering practicability.Numerical results show that the proposed channel access method can effectively improve the average throughput of the system.

Key words: reliable multicast communication, optimal stopping theory, distributed wireless channel access

CLC Number:

TN92

Yizhu WANG, Zhou ZHANG, Piming MA, Baoquan REN. Research on optimal channel access method for distributed wireless network based on reliable multicast communication[J]. Chinese Journal on Internet of Things, 2022, 6(4): 14-26.

Figures/Tables 12

参数名称	数值	单位
多播组数K	10	个
组内信宿数M	5	个
信道衰落类型	瑞利衰落、块衰落
信噪比 $σ_{h}^{2}$	1～19	dB
带宽	20	MHz
信息速率阶数V	6	个
空闲时隙时长δ	25	μs
RTS包时长 $τ_{RTS}$	50	μs
CTS包时长 $τ_{CTS}$	50	μs
ACK包时长 $τ_{ACK}$	50	μs
信道接入时间 $τ_{d}$	5、10、30	ms

	$σ_{h}^{2}$	1	3	5	7	9	11	13	15
直接停止接入方法	τ_d=5 ms	95%	63%	50%	38%	29%	23%	19%	14%
	τ_d=30 ms	221%	152%	115%	89%	80%	61%	47%	32%
自适应重传可靠接入方法	τ_d=5ms	1 088%	302%	110%	37%	17%	7%	6%	6%
	τ_d=30 ms	2 383%	628%	254%	107%	72%	42%	40%	30%

	$σ_{h}^{2}$	1	3	5	7	9	11	13	15
直接停止接入方法	τ_d=5 ms	182%	114%	101%	57%	50%	43%	41%	28%
	τ_d=30 ms	388%	220%	167%	135%	124%	86%	70%	44%
自适应重传可靠接入方法	τ_d=5 ms	1 397%	344%	155%	52%	26%	18%	16%	15%
	τ_d=30 ms	2 739%	661%	387%	121%	86%	52%	49%	36%

References 31

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k	1	2	3	4	5	6	7	8	9	10
p_k	0.1	0.3	0.5	0.2	0.5	0.4	0.8	0.1	0.2	0.4

	R₁	R₂	R₃	R₄	R₅	R₆
速率/(Mbit·s^-1)	6.5	13.0	19.5	26.0	39.0	52.0
调制方式与码率	BPSK1/2	QPSK1/2	QPSK3/4	16QAM1/2	16QAM3/4	64QAM2/3
信噪比阈值γ/dB	0.25	0.57	0.97	1.46	2.86	5.06

Research on optimal channel access method for distributed wireless network based on reliable multicast communication

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