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Efficient content distributing technology of satellite network
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A satellite network and satellite technology, which is applied in the field of satellite communication, can solve the problems of reducing the efficiency of information transmission, and achieve the effect of reducing the number of transmissions, reducing waiting time, and adapting well
Inactive Publication Date: 2011-01-12
BEIJING UNIV OF POSTS & TELECOMM
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specific Embodiment approach 1
[0035]Randomized network coding is a practical way to achieve the coding of each intermediate node without a central designer. It is well suited for distributed and mobile networks. To perform stochastic linear network coding, each transmitting node randomly linearly combines all input information to obtain output information (assuming, of course, that all messages are of the same type, or in the same linear space). Based on this advantage, we design the following protocol.
[0036] Initialize the link based on the Hello-ACK (Acknowledgements) process.
[0037] 1. Combined data blocks for each satellite transmission and the ECI and coding coefficient {a 1，j ,...,a n，j},
[0038] where a i，j Randomly selected in a finite field, i, j=1,...,n.
[0039] 2. If the receiver has not received all the data blocks after waiting for a certain period of time, the transmission is regarded as ACK a The number of lost data blocks m.
[0040] 3. After receiving the ACK, the satellit...
specific Embodiment approach 2
[0057] In order to reduce the transmission redundancy of coding coefficients, we can choose deterministic linear network coding instead of random linear network coding techniques due to the nature of Vandermonde determinant. In this case, we only need to transmit one encoding coefficient, which will greatly reduce the consumption of transmission. The specific process is as follows.
[0058] Initialize the link with the Hello-ACK procedure.
[0059] 1. Each satellite transmission At the same time, its ECI and index set {j} are attached, j=1,...,n.
[0060] 2. If the receiver has not received all the data blocks after waiting for a certain period of time, it transmits the number m of missing data blocks as ACK.
[0061] 3. After receiving the ACK, the satellite transmits another n-m data blocks.
[0062] 4. Repeat steps 2 and 3 until the receiver receives n linearly independent data blocks to restore v 1 ,...,v n , thereby refactoring the file.
[0063] One-way communica...
specific Embodiment approach 3
[0069]
[0070] Then there is the following equation
[0071] U'X=Y
[0072] Recoverable message set X, where Y is the received encoded message matrix. The overall process is as follows
[0073] Initialization the received information u 1 =U 1 , u 1 comes from y 1 Input the received new information y i
[0074]
[0075] Output X
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Abstract
The invention relates to an efficient large-scale file distributing method of a satellite network, which is achieved by the following steps: the satellite network is fully utilized to provide the practicability of personal communication service, strong information processing capability and efficient and convenient data service function; and proper communication protocols are configured at a satellitesignal emitting port, a transfer station point and an intelligent terminal by virtue of a network coding technology. The communication protocol achieves signal-way point-to-point communication of a satellite, and distribution and contents download of large-scale contents on the satellite network. The invention comprises an efficient distributing technology which is provided on the basis of random linear network coding and aims at contents distribution of a two-way satellite network, an efficient and robust distribution technology which is based on determining the linear network codes and a maximum distance separable code theory and a distribution technology which is based on a Gibert-Elliot error model, aims at a signal passageway point-to-point communication system and achieves efficiency and strong adaptability. The invention has the advantages of convenient achievement, small transmission redundancy, high efficiency, good adaptability and the like.
Description
1. Technical field [0001] The invention relates to the field of satellite communication. Specifically, the invention provides a communication scheme for realizing efficient content distribution and reception at the satellite signal transmitting end, signal transfer and intelligent receiving end. 2. Background technology [0002] Satellite networks provide global coverage and wide-area service, making them ideal for scenarios requiring fast and timely connections, or for long distances and difficult obstacles [1，2] . For example, the update of large-scale distributed databases, and the long-distance release of large amounts of information such as medical treatment and news [1，3，4] . the broadcast nature of satellites can provide the efficiency of transmitting information for multiple users [9] . [0003] Recently, in [5] The author provides a special system - SPIDER, which is used to quickly distribute large-scale files from a single source to multiple receiving nodes ba...
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