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Wireless multicast transmission and rate adaptation method during train-ground communication and system thereof

A rate-adaptive, multicast transmission technology, applied in wireless communication, broadcast service distribution, error prevention/detection using the return channel, etc., can solve problems such as inability to directly apply multicast services, unclear and unsmooth images, etc. Achieve the effect of avoiding instability and unsmooth problems, increasing transmission rate, and improving reliability

Active Publication Date: 2012-06-13
ZTE ITS CO LTD
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Problems solved by technology

IEEE 802.11a, 802.11b, and 802.11g all provide multi-rate transmission capabilities at the physical layer. All control frames, broadcast, and multicast frames are sent at the basic rate, and RTS / CTS and ACK must be sent at this rate, generally 1Mbps. , this rate cannot guarantee the normal transmission of multicast video streams, which will inevitably cause serious packet loss, resulting in unclear and unsmooth images
With the development of technology, due to the use of rate control algorithms in unicast transmission, unicast data frames can choose different rates according to channel conditions: when the channel has a high signal-to-noise ratio, you can choose to send data at a high rate, but this method only Relies on the estimation of a single channel state and cannot be directly applied to multicast services
There is no practical rate control algorithm that does this for multicast transmissions

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  • Wireless multicast transmission and rate adaptation method during train-ground communication and system thereof
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  • Wireless multicast transmission and rate adaptation method during train-ground communication and system thereof

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with specific drawings and embodiments.

[0026] Vehicle-to-ground communication adopts 802.11 wireless network technology, and generally obeys the basic structure service set (infrastructure BSS), which is defined within the transmission range of the access point AP, such as figure 1 shown. The mobile node STA must establish an association with the access point AP before obtaining network services. Association refers to the process in which a mobile node joins an 802.11 network. For a mobile node STA, the association must be unique; each mobile node STA can only connect to one access point AP at a time; and the 802.11 standard does not limit the number of STAs that an AP can serve.

[0027] The MAC working environment of WLAN (Wireless Local Area Networks; WLAN) is much more complicated than that of 802.3. In order to adapt to the environment, the MAC sublayer provides a variety of service entities...

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Abstract

The invention relates to a wireless multicast transmission and rate adaptation method during train-ground communication and a system thereof. The communication method comprises the following steps that: a. an access point and a mobile node work in a multicast mechanism state and the multicast mechanism is correspondingly arranged corresponding to a frame control domain; b. the access point initially sends a multicast data flow to the mobile node as a fixed rate and receives an ACK data frame of the mobile node in a multicast group; c. after receiving the ACK data frame corresponding to the mobile node, the access point analyzes and compares link communication quality between the mobile node corresponding to the ACK data frame and the access point and selects a link with the poor communication quality between the access point and the mobile node as a reference link, and a signal to noise ratio of the reference link is selected as the reference signal to noise ratio; d. the access point selects to send the multicast data flow as the optimum transmission rate corresponding to the reference link according to a range of the reference signal to noise ratio. In the invention, the multicast rate adaptation can be realized; fluency and reliability of data transmission in a train-ground communication system can be increased.

Description

technical field [0001] The invention relates to a wireless communication method and system, in particular to a method and system for wireless multicast transmission and rate self-adaptation during vehicle-to-ground communication, belonging to the technical field of wireless communication. Background technique [0002] PIS (Passenger Information System) system is becoming more and more popular along with WLAN mobile communication and other related technologies. As the most intuitive information interaction platform between subway companies and passengers, it not only ensures the safety of train operation but also increases the comfort of passengers; In addition to text information such as travel instructions and train timetables displayed in the compartment, real-time dynamic information such as stock information, news, live events, advertisements, etc. can also be played in case of abnormal situations such as fire, congestion, and terrorist attacks. [0003] In order to meet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W4/06H04W24/08H04W84/12H04L1/18
Inventor 彭敏刘海峰李翔黄溅华
Owner ZTE ITS CO LTD
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