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Service-quality-sensitive 802.11e multimedia data grouping scheduling method

A multimedia data and quality of service technology, applied in the computing field, can solve the problems of low priority flow starvation, low priority, difficult channel access rights, etc., to achieve the effect of ensuring fairness of transmission and wide application prospects

Inactive Publication Date: 2012-11-28
HUNAN UNIV
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Problems solved by technology

However, the EDCA mechanism has its shortcomings: AC queues with high priority (audio, video) have more opportunities to compete for channel access rights. If the AC queue with high priority has been occupying the channel, the services of the AC queue with low priority will be little or no service
The low-priority AC queue will become urgent (Urgency) due to too long waiting time, and needs to be given priority service, but because its AC queue has a low priority level, it is difficult to compete for access to the channel, so starvation will occur , which seriously affects the performance of wireless communication
[0015] Therefore, although the EDCA mechanism in 802.11e guarantees the channel access rights of audio and video streams, low-priority streams may be unable to receive services for a long time because high-priority streams have been occupying the channel. The phenomenon of waiting and starvation of transmission, cannot guarantee the fairness of business flow transmission

Method used

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  • Service-quality-sensitive 802.11e multimedia data grouping scheduling method
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  • Service-quality-sensitive 802.11e multimedia data grouping scheduling method

Examples

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Embodiment 1

[0052] Embodiment 1: A wireless access point AP N 0 To four wireless client nodes client(N 1 , N 2 , N 3 , N 4 ) to send data packets. Each node receives a type of data service flow, the data rate of the access point is 2Mb, and the basic rate is 1Mb. The default parameter settings of each AC queue of EDCA are shown in Table 2, and the basic parameter settings of each service flow and the corresponding AC queues are shown in Table 4. The experiment uses NS-2 developed by UC Berkeley to simulate the EDCA mechanism of 802.11e and the proposed QoS delay-sensitive data packet scheduling method.

[0053] Packet-size in Table 4 is the size of the data packet and the size of the IP header, such as the audio stream in the AC_VO queue, the data size is 160B, the IP header is 20B, and the rate (Rate) is set according to the multimedia data in Table 3, the audio stream rate of the AC_VO queue 72Kb consists of 64Kb data rate and 8Kb IP header transmission rate. When performing emer...

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Abstract

The invention provides a service-quality-sensitive 802.11e multimedia data grouping scheduling method, which comprises the following steps: aiming at the unfair problem of the multimedia data scheduling by an enhanced distributed channel access (EDCA) mechanism in 802.11e, combining with time delay sensibility of quality of service (QoS), calculating the emergency degree of data grouping in a plurality of media service flows in real time, regulating the parameter of alternating current (AC) arrays according to the emergency degree, and changing the priority of the AC arrays, so that emergencyservice flows have more chances to compete the signal channel access right, thus ensuring the signal channel competing fairness of the emergency service flows relatively to service flows with high priority. Experiment results prove that the bandwidth requirements of the emergency service flows in the emergency service flow grouping scheduling scheme is ensured.

Description

technical field [0001] The invention relates to the technical field of computing, in particular to the transmission application of multimedia services, in particular to a quality-of-service sensitive 802.11e multimedia data packet scheduling method. Background technique [0002] With the wide application of multimedia technology and the vigorous development of wireless communication technology, the application of multimedia services in wireless networks has attracted more and more attention. The data packet scheduling method of the wireless network determines the sequence or timing of the data packet transmission to ensure the fairness of network transmission and improve the network throughput, and has become an effective method to improve the transmission efficiency in the wireless network. [0003] However, so far, there are few data scheduling methods for the 802.11 protocol, and it is difficult to guarantee the fairness of data packet transmission. It is urgent to design...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/56H04L29/06H04L47/6275
Inventor 乐光学谢鲲龚闯文吉刚陈丽萍周旭赵利平
Owner HUNAN UNIV
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