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Multicast method in wireless local area network

A wireless network and multicast group technology, applied in the field of multicast, can solve problems such as resource waste and failure to work, and achieve the effect of reducing delay and eliminating the probability of loss and collision

Inactive Publication Date: 2009-09-02
NTT DOCOMO INC
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  • Abstract
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  • Claims
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Problems solved by technology

But this approach doesn't work when there are many ACM configurations supported in the standard
For example, in IEEE 802.11n, a maximum of 576 rate configurations can be supported. If the length of the CTS is also defined as 576, it will obviously cause a very large waste of resources.

Method used

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  • Multicast method in wireless local area network
  • Multicast method in wireless local area network
  • Multicast method in wireless local area network

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Embodiment Construction

[0051] Embodiments of the present invention will be described in detail below with reference to the accompanying drawings, and unnecessary details and functions for the present invention will be omitted during the description to prevent confusion in the understanding of the present invention.

[0052] figure 2 A schematic diagram of the frame format of the RTS in the prior art is shown. Such as figure 2 As shown, the RTS frame of the prior art defined in 802.11 includes a frame control (frame control) domain, a duration (duration) domain, a DA (destination address) domain, a TA (transmitter address) domain, and a CRC ( cyclic redundancy check). Among them, the frame control field is mainly used to indicate the type of the frame, the duration field is used to reserve a channel, and the CRC field is used to judge whether the received frame is correct.

[0053] image 3 A schematic diagram showing the frame format of the MRTS performing multicast transmission at the MAC lay...

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Abstract

The invention discloses a method for executing multicast transmission in a media access control (MAC) layer of a wireless network, which comprises the steps as follows: a sender divides multicast group members into groups according to the channel conditions of the multicast group members and indicates a representative node of each group; the sender multicasts an MRTS (Marginal rate of technical substitution) containing the indication whether data packets to be sent to a multicast group exist to the multicast group members and waits for an MCTS from the representative node of each group; afterthe MCTS from the representative node of each group is received, the sender multicasts the data packets to the multicast group members and records the sequence number of the current sent data packet;and after receiving the multicast data packets, the representative node records a value that indicates whether the current sent data packet is correctly received in a bit mapping field of each MCTS and sends the MCTS to the sender after a preset time period. The sender judges whether data packet loss exists according to the recorded value in the bit mapping field of the MCTS from the representative node; and under the situation of data packet loss, the sender retransmits the lost data package when sending data packets next time.

Description

technical field [0001] The present invention relates to a method of multicasting in a wireless network, and in particular, to a method for reliably performing multicast transmissions in a wireless local area network by grouping receiving members and sending only a representative of each group to the sender Feedback information, thereby reducing delay, improving the efficiency of multicast protocols, and reducing the overhead of control packets. Background technique [0002] In wireless broadband access technology, IEEE 802.11 has become a very common choice. At present, many important applications on wireless local area network (WLAN) are based on multicast transmission. These applications include, but are not limited to, multimedia conferencing, shared whiteboards, distance education, multi-party gaming, and distributed computing, among others. [0003] Multicasting (also known as multicasting) refers to the transmission of data packets from one source to multiple destina...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/18H04L12/28
Inventor 王晓利张永生山田晓
Owner NTT DOCOMO INC
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