多速率多节点IEEE 802.11网络的视频传输策略

doi:10.11959/j.issn.1000-436x.2017059

Abstract

Abstract:

The video transmission strategy VQCW (video queue contention window) was proposed for video transmission fair problem in multi-rate and multi-node IEEE 802.11 networks.The strategy was based on node queue selective packet drop and contention window dynamic adjustment.It deduced a maximum throughput model according to initial contention window size because of the relation between throughput and initial contention window size.This model can provide theoretical upper limit for improving throughput.The theoretical modeling and NS simulation show that the proposed strategy can maintain both video transmission quality and high network overall throughput.

Key words: IEEE 802.11, performance anomaly, multi-rate, video transmission, throughput

CLC Number:

TP393

Liang CHEN,Xiang GU,Jin WANG. Video transmission strategy in multi-rate and multi-node IEEE 802.11 networks[J]. Journal on Communications, 2017, 38(3): 34-44.

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References 15

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参数	参数值
R_control基本速率/(Mbit·s^?1)	1
T_P/μs	144
T_PHY/μs	48
slot/μs	20
DIFS/μs	50
SIFS/μs	10
CW_min	32
CW_max	1 024
MAC头长度L_MAC-H/bit	224
RTS帧长度L_RTS/bit	180
CTS帧长度L_CTS/bit	112
ACK帧长度L_ACK/bit	112

PSNR/dB	等级
>37	excellent
31~37	good
25~31	fair
20~25	poor
<20	bad

视频帧号	视频帧类型	视频帧尺寸/byte	UDP分组数量	发送时刻/s
1	I	6 865	7	0.034
2	P	5 446	6	0.134
3	B	1 442	2	0.134

算法	PSNR/dB
VQCW	28.8
TRPSA	33.7
CWA	12.5

算法	PSNR/dB
VQCW	28.8
TRPSA	33.2
CWA	12.4

Video transmission strategy in multi-rate and multi-node IEEE 802.11 networks

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