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Random centralized scheduling method of video blocks in DTN

A block and video technology, applied in the field of wireless networks, can solve the problems of not being able to receive blocks in time, video playback, understand the impact, etc., and achieve the effect of increasing effective communication and improving the delivery rate.

Inactive Publication Date: 2015-06-03
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, if there are many missing blocks, and limited to the network environment and unable to receive relatively complete and complete blocks in time, it will affect the playback and understanding of the video

Method used

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  • Random centralized scheduling method of video blocks in DTN
  • Random centralized scheduling method of video blocks in DTN
  • Random centralized scheduling method of video blocks in DTN

Examples

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Embodiment Construction

[0029] In a basic implementation like Figure 1 to Figure 1 1 provides a random centrality scheduling method for video blocks in a DTN network, which is used to adjust the centralized distribution of video blocks on the time axis. The method includes two nodes A and B establishing a Boolean vector table locally, and the Boolean vector table is used to save the block existence state in the current node, and then the step of block scheduling between the two nodes A and B as follows:

[0030] S1: the A node and the B node move in a general delay-tolerant network scenario;

[0031] S2: Determine whether node A and node B have entered the communication range of the other party, if yes, enter step S3, otherwise return to S1;

[0032] S3: Nodes A and B exchange their respective Boolean vector tables;

[0033] S4: Calculate whether the video block needs to be transmitted to the other party through the XOR operation, if yes, go to S5, otherwise, go to S11;

[0034] S5: Node A deter...

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Abstract

The invention discloses a random centralized scheduling method of video blocks in DTN (Delay Tolerant Networks). The random centralized scheduling method is used for adjusting the video blocks to be concentrated on the time axis and comprises the following steps: performing logical operation on a Boolean vector table in mobile nodes within the communication range, counting data blocks that can be sent, determining the sending priority through calculating a block scarcity degree of the data blocks to be sent, designing a scheduling algorithm, and interfering the block transmission process, so that the distribution of the video blocks in a target node meets the application requirements.

Description

technical field [0001] The invention relates to the field of wireless networks, in particular to a method for adjusting the randomly concentrated distribution of video blocks on the time axis. Background technique [0002] In a real delay tolerant network (Delay Tolerant Networks, DTN), the movement of nodes is random, and the communication between nodes is opportunistic. For video content with a large amount of data, it is difficult to carry out effective transmission in the harsh DTN network environment with frequent interruptions. The commonly used method is to divide the video data into several data blocks of the same size on the source node. When the block size is appropriate, it can meet the short-term opportunity communication reality. After a certain delay, it is expected to receive all data at the target node. The data blocks are then merged to obtain the same video content as the source node. However, in DTN network communication, the emergence and demise of node...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N21/262H04N21/234H04N21/238
Inventor 王小明朱腾蛟李鹏张丹张杨
Owner SHAANXI NORMAL UNIV
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