Transmission control method based on differentiated service in IEEE 802.11 WLAN

A technology for transmission control and differentiated services, which is applied in the direction of error prevention/detection, network traffic/resource management, and electrical components using return channels, which can solve problems such as packet loss and inability to provide QoS guarantees for real-time multimedia services. The effect of transmission delay

Inactive Publication Date: 2012-05-23
NANJING TECH UNIV
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Problems solved by technology

However, these methods do not take into account that the receiving buffer of the node is not infinite. In the case of saturation, a large number of packets will inevitably be lost. Therefore, these methods can only meet the relative distinction of throughput, but cannot provide real-time multimedia services. QoS Guarantee

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  • Transmission control method based on differentiated service in IEEE 802.11 WLAN
  • Transmission control method based on differentiated service in IEEE 802.11 WLAN
  • Transmission control method based on differentiated service in IEEE 802.11 WLAN

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Embodiment Construction

[0021] In terms of architecture, such as figure 1 Shown is the mobile ad hoc network communication topological structure that the inventive method is based on, as figure 2 Shown is the system structure of mobile ad hoc network, the present invention mainly increases the mechanism to the definition of data flow priority in the network layer of ad hoc network, and these information are preserved in the TOS field of IP packet head, have introduced in MAC layer The packet retransmission times counter, for the data packets that need to be sent or forwarded, saves the retransmission times of the packet in the header of the MAC frame, and also adds a packet sending control mechanism in the node buffer queue.

[0022] In terms of communication mechanism, before the node transmits data packets, it is first necessary to mark the priority of the transmitted data packets according to certain rules, and then introduce a denial of service mechanism at the node, which is only for low-priori...

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Abstract

The invention discloses a transmission control method based on differentiated service in the IEEE 802.11 WLAN, belonging to the technical field of the wireless mobile ad hoc network data stream. The data streams in the mobile ad hoc network are divided into the data stream which is sensitive to the time delay and the data stream which is not sensitive to the time delay and the two kinds of data streams are marked respectively; an MAC layer packet retransmission counter is adopted in the process of sending and forwarding nodes; the retransmission times of data packets are saved on the head of the MAC frame of the data packets which need to be sent or forwarded; a packet control mechanism is adopted at the exit of the node interface queue so that the data packets are sent and forwarded differently according to the priority of the data packets; and the sent nodes are made to double the contention window thereof or minimize the contention window according to the successful or failed sending of the data packets of the two kinds of data streams, wherein the sent nodes minimize the contention window thereof after the data packets of high priority or the data packets of low priority are retransmitted for the maximum times. The transmission control method can make the data stream of high priority occupy more bandwidth resources and can reduce the transmission time delay and the loss rate of the data packets.

Description

technical field [0001] The invention relates to a transmission control method based on differentiated service in IEEE 802.11 WLAN in wireless mobile multimedia communication, and belongs to the application field of wireless mobile ad hoc network data flow. Background technique [0002] The mobile ad hoc network is composed of a group of static or mobile nodes, does not depend on the existing network infrastructure and adopts distributed management. All nodes in the network have the function of a router, responsible for discovering and maintaining routes to other nodes, and transmitting or forwarding packets to neighboring nodes, so an ad hoc network is usually a multi-hop network. In addition, nodes can move freely, entering and exiting the network autonomously, so that the topology of the network often undergoes rapid and unpredictable changes. This kind of network can not only operate as an independent network, but also can be connected to the wired backbone network (such...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W28/04H04L1/18
Inventor 白光伟吴志刚曹磊吴艳洁靳勇沈航王军元
Owner NANJING TECH UNIV
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