Self-adapting multimedia stream control method in sensor network

A sensor network and multimedia streaming technology, applied in the direction of data exchange network, transmission system, digital transmission system, etc., can solve the problems that cannot meet the urgent needs of practical applications, there is no mature QoS framework method, etc., so as to improve the playback quality and reduce the Effect of channel detection, improved performance

Inactive Publication Date: 2010-02-10
NANJING UNIV OF TECH
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Problems solved by technology

At present, the research on WMSNs service quality at home and abroad has just started, and there is no mature and

Method used

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  • Self-adapting multimedia stream control method in sensor network
  • Self-adapting multimedia stream control method in sensor network
  • Self-adapting multimedia stream control method in sensor network

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[0032] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings, taking multimedia video streams as an example:

[0033] 1. Adaptive communication flow control mechanism based on cross-layer design

[0034] 1.1 Communication performance analysis

[0035] The research work is carried out on IEEE802.15.4 sensors. The 802.15.4 network protocol stack is based on the Open System Interconnection Model (OSI), and each layer implements part of the communication function and provides services to the upper layers. The 802.15.4 standard defines a single MAC layer and multiple physical layers. The several protocol layers above the MAC sublayer, including Service Specific Convergence Sublayer (SSCS: Service Specific Convergence Sublayer), Link Control Sublayer (LLC: Logical LinkControl), etc., are only possible upper-layer protocols of the 802.15.4 standard. Within the definition of the standard.

[0036] There is an interface...

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Abstract

The invention discloses a self-adapting multimedia stream control method in a sensor network, which belongs to the field of communication networks of computers. The method comprises the following steps: a data link layer dynamically monitors an interface array according to the characteristics of the multimedia coded video sequence and informs an application layer in time; when the quality of a radio link gets poor, and the communication congestion occurs or probably occurs, the application layer starts an active video frame discarding policy, and a transmitting node actively discards part of low priority video frame data which are less important to the playing quality of a receiver so as to reduce a communication load and increase the successful transmitting probability of a high priorityvideo frame; and when the communication is normal, the transmitting node normally transmits the video frame. The invention can improve the playing quality of a video stream at the receiver, reduce theenergy consumption of the node and improve the performance for transmitting multimedia data in real time by the wireless sensor network.

Description

technical field [0001] The invention relates to an adaptive multimedia flow control method in a sensor network, which belongs to the field of computer communication networks. Background technique [0002] So far, most sensor networks only collect, process and transmit single physical environment scalar data (scalar data) such as temperature, pressure, humidity, object position, etc., so the requirements for communication network bandwidth are very low and can tolerate large Transmission delay. Recently, hardware devices such as low-cost CMOS cameras and microphones have come into practical use, and wireless communication bandwidth has also increased from tens of megabits per second to tens of megabits per second. It has become possible to perceive, collect, process and (real-time) transmit multimedia data including still images, audio and video through multimedia sensor devices. The resulting Wireless Multimedia Sensor Networks (WMSNs: Wireless Multimedia Sensor Networks) ...

Claims

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Application Information

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IPC IPC(8): H04N7/24H04L29/08H04L12/56
Inventor 白光伟沈航曹磊陶金晶王军元靳勇吴志刚
Owner NANJING UNIV OF TECH
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