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WLAN VoIP transfer method based on the unicast

A wireless local area network, unicast technology, applied in transmission systems, digital transmission systems, data switching networks, etc., can solve the problems of VoIP services cannot be reliably transmitted, and cannot directly apply VoWLAN, etc., to reduce packet loss rate, reduce power consumption, The effect of improving system performance

Inactive Publication Date: 2009-08-12
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

We found that when the multicast method is used for the transmission of VoIP voice frames, the packet loss rate due to the above reasons is about 10% higher than that of the unicast method, which has far exceeded the maximum VoIP recommended in ITUT-G.114 The packet loss rate should not exceed the requirement of 3%, so that the scheme similar to M-M cannot be directly applied to the existing VoWLAN
The root cause of the above problems is that VoIP services transmitted by multicast frames cannot be transmitted reliably in WLAN.

Method used

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  • WLAN VoIP transfer method based on the unicast
  • WLAN VoIP transfer method based on the unicast
  • WLAN VoIP transfer method based on the unicast

Examples

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Embodiment Construction

[0038] Such as Figure 6 As shown, a typical VoWLAN environment where the present invention is applied is given. The terminal accesses the wired network through the AP, and the WLAN protocol is IEEE802.11. The unicast multiplexing service completes the multiplexing of the voice packets sent by the router into a multiplexed packet and sends it to the AP, and the AP forwards the multiplexed packet to the terminal.

[0039] For example, given the configuration of the unicast multiplexing server and the IP addresses of 4 terminals under the AP:

[0040] IP address subnet mask unicast multiplexing server 162.105.76.1 255.255.255.0 Terminal 1 162.105.76.111 255.255.255.0 Terminal 2 162.105.76.112 255.255.255.0 Terminal 3 162.105.76.113 255.255.255.0 Terminal 4 162.105.76.114 255.255.255.0

[0041] As stated in the Summary of the Invention, first, the unicast multiplexing server divides the voice packet at a certain time interval...

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Abstract

The wireless LAN Void transmission method based on unicast comprises: 1. joining in turns the speech packages in a certain time interval into one multiplex group, deciding whether all addresses of packages in the dynamic address list, and adding this one into the list if not; 2. copying ip head of the package with address in the front of the dynamic list, rewriting its version field or service filed into special value as the recognition head for whole group, and removing the objective address to list end; 3. according to the MAC address determined by the recognition head, transmitting the group by unicast way; and 4. all terminals on confounding mode receive this group to find out self package according to group IP head and transmit upward, and abandons package other packages.

Description

technical field [0001] The invention relates to the technology supporting voice over IP (VoIP) in the wireless local area network (WLAN), especially the WLAN defined by the IEEE802.11 standard and working under the distributed coordination function (DCF). Background technique [0002] The WLAN defined by the IEEE802.11 protocol works at several typical working rates of 1M / 2M / 11Mbps, and multiple wireless stations communicate according to a certain access mode through shared space and frequency resources. According to whether its access mode is based on competition, WLAN channel access methods can be divided into: 1) Distributed coordination function (DCF) based on CSMA / CA (carrier sense / collision avoidance); 2) Centralized control based on polling mode (PCF). However, most existing WLAN products on the market only support the DCF method. [0003] For DCF-based access methods, all wireless stations and wireless access points (APs) are in the same contention domain, and comp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/56H04L12/28H04L29/06
Inventor 刘志敏罗艳王东赵玉萍
Owner PEKING UNIV