车载自组织网视频流媒体协助下载研究

doi:10.11959/j.issn.1000-436x.2019018

Abstract

Abstract:

The same direction multi-hop downloading network flow model was proposed for vehicle communication range and channel competition under forwarding.According to the model and video streaming media characteristic,the same & opposite direction cooperative downloading quality of service (SODCD-QoS) scheme was presented.First,the same direction vehicles helped the target vehicle to achieve multi-hop cooperative downloading.It can reduce the waste of time which the target vehicle has to wait for opposite direction cooperative vehicle.Secondly,the next base stations loaded data into eligible opposite direction vehicles according to vehicles option strategy based on time first or picture quality first.Then the opposite direction vehicles helped the target vehicle to achieve one-hop cooperative downloading.NS simulations show that the SODCD-QoS scheme is better than DSRelay and VCoDS algorithm in terms of download time.Further,the new scheme can maintain good picture quality PSNR.

Key words: vehicular ad hoc network, video streaming media, cooperative downloading, QoS

CLC Number:

TN918

Liang CHEN,Jun WANG,Rong CHEN,Xiang GU,Jin WANG,Jie WAN. Research on video streaming media cooperative downloading in vehicular ad hoc network[J]. Journal on Communications, 2019, 40(1): 51-63.

Figures/Tables 16

记录号	事件类型	事件发生时刻/s	节点代号	协议层	分组丢失原因	帧序号	帧类型
2	s	10.638 406	_0_	MAC	—	273	视频
3	r	10.638 999	_1_	MAC	—	273	视频
5	r	10.639 06	_0_	MAC	—	0	ACK
14	s	10.734 995	_0_	MAC	—	274	视频
15	r	10.736 488	_1_	MAC	—	274	视频
16	s	10.736 504	_1_	MAC	—	0	ACK
18	s	10.736 683	_0_	MAC	—	274	视频
19	d	10.738 176	_1_	MAC	DUP	274	视频
20	s	10.738 192	_1_	MAC	—	0	ACK
21	s	10.738 56	_0_	MAC	—	274	视频
22	d	10.740 053	_1_	MAC	DUP	274	视频
$⋮$	$⋮$	$⋮$	$⋮$	$⋮$	$⋮$	$⋮$	$⋮$
36	d	10.750 861	_0_	RTR	CBK	274	视频
43	d	10.750 861	_0_	MAC	RET	274	视频
44	s	10.750 886	_0_	MAC	--	0	AODV

References 17

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NS2参数	对应文中变量	参数值
BasicRate/（Mbit.s^-1）	—	1
DataRate/（Mbit.s^-1）	ω	3
ACKTime/s	T_ACK	0.000 112
SlotTime/s	T_σ	0.000 013
DIFS/s	T_difs	0.000 058
SIFS/s	T_sifs	0.000 032
DataTime/s	T_data	0.002 949
CW_max_	CW_max	1 024
CW_min_	CW_min	32
RetryLimit_	m	7

模型	一跳/Mbit	二跳/Mbit	三跳/Mbit	四跳/Mbit	五跳/Mbit	合计/Mbit
NS仿真	178.0	78.9	42.7	30.5	26.4	356.5
改进模型	175.8	78.6	41.8	20.9	10.4	327.6
VCoDS模型	165.7	44.0	28.8	21.2	16.7	276.4

模型	一跳/Mbit	二跳/Mbit	三跳/Mbit	四跳/Mbit	五跳/Mbit	合计/Mbit
NS仿真	104.2	47.1	22.1	9.8	5.8	189.1
改进模型	105.5	47.2	25.1	12.5	6.3	196.5
VCoDS模型	165.7	26.4	17.3	12.7	10.0	232.1

模型	一跳/Mbit	二跳/Mbit	三跳/Mbit	四跳/Mbit	五跳/Mbit	合计/Mbit
NS仿真	54.3	23.2	12.5	5.6	2.8	98.5
改进模型	52.7	23.6	12.5	6.3	3.1	98.3
VCoDS模型	165.7	13.2	8.6	6.4	5.0	198.9

模型	一跳/Mbit	二跳/Mbit	三跳/Mbit	四跳/Mbit	五跳/Mbit	合计/Mbit
NS仿真	25.1	11.7	7.1	3.6	2.3	49.8
改进模型	26.4	11.8	6.3	3.1	1.6	49.1
VCoDS模型	165.7	6.6	4.3	3.2	2.5	182.3

Research on video streaming media cooperative downloading in vehicular ad hoc network

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Figures/Tables 16

References 17

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视频帧号	视频帧类型	视频帧尺寸/B	UDP分组数量	发送时刻/s
1	I	4 921	5	0.035
2	P	1 008	1	0.135
3	B	97	1	0.135
4	B	91	1	0.135
5	P	653	1	0.235

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PSNR/dB	等级
>37	优
31~37	良
25~31	中
20~25	较差
<20	差