Time-division double-time-slot scheduling method for large-span space-based data link

A scheduling method and time-division duplex technology, applied in duplex signal operations, digital transmission systems, radio transmission systems, etc., can solve the problems of large distance changes between nodes, increased access difficulty, and large propagation delay, etc. Achieve the effect of shortening idle time, improving network capacity, and improving channel utilization.

Active Publication Date: 2020-03-31
10TH RES INST OF CETC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of large propagation time delay between satellites and large distance changes between nodes causing serious time delay jitter and increased access difficulty, and to provide a method that can improve the utilization rate of time-frequency resources, improve system capacity, reduce Time-division duplex time slot scheduling method for long-span space-based data link with small delay to solve the time-slot scheduling problem of space-based data link in time-division duplex mode

Method used

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  • Time-division double-time-slot scheduling method for large-span space-based data link
  • Time-division double-time-slot scheduling method for large-span space-based data link
  • Time-division double-time-slot scheduling method for large-span space-based data link

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Embodiment 1

[0031] refer to figure 2 . The antennas of each node start from the right in a clockwise direction, and the right, rear, left, and front antenna switching sequences occupy a time slot and send signals in turn. Lines with the same serial number represent links that can multiplex the same time slot for communication. right way. Since satellite nodes are far away from each other, generally the effective communication distance of each satellite is one hop, so the interference to satellite nodes beyond one hop can be ignored; and the satellite is equipped with a directional antenna, so in practice, Each satellite can only communicate with its 4 neighbor satellites in front, back, left and right. At this time, using the spatial multiplexing of the directional narrow beam antenna, nodes in other directions can use different areas to transmit data packets at the same time without interfering with each other, so the number of time slots can be greatly saved. Therefore, in an option...

Embodiment 2

[0033] refer to image 3 . Satellites are used to communicate with front and back satellites on the same orbit, and adjacent satellites on adjacent orbits. Each satellite node can only communicate with its front, back, left, and right four one-hop neighbor satellite nodes B, C, D, and E; B, C, D, and E are one-hop neighbor nodes that node A can communicate with, node B is behind node A, node C is on the left of node A, node D is in front of node A, node E is on the right of node A Square, the nodes in odd columns and rows and the nodes in even columns and rows behind, left, front and right each take a time slot to send signals in turn; the nodes in odd columns and rows and the nodes in even columns and odd rows The front, right, rear, and left antenna switching sequences of the nodes each occupy a time slot to send signals in turn; lines with the same serial number represent link pairs that can multiplex the same time slot for communication. Simultaneously transmit data pack...

Embodiment 3

[0036] refer to Figure 4 . The sending time is longer than the propagation time delay, and the node antennas of the two communicating parties divide a time slot into two parts, the sending state and the receiving state, which are separated before and after and have the same length. Node A is in the sending state in the first half and in the receiving state in the second half; Node B is correspondingly in the receiving state in the first half, and in the sending state in the second half; the completion of node A’s transmission is delayed to node B’s reception after a propagation time delay, and node B’s transmission is delayed to node A’s reception after a propagation time delay.

[0037] refer to Figure 5 . In the satellite scenario, the propagation delay is relatively large. Generally, the sending time is shorter than the propagation delay. The node antennas of the two communication parties still divide a time slot into two parts, the sending state and the receiving state...

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Abstract

The invention discloses a time-division double-time-slot scheduling method of a large-span space-based data link, and aims to solve the problem of time slot scheduling of the space-based data link ina time division duplex working mode. The method implemented by the technical scheme comprises: simultaneously transmitting data packets in different regions by utilizing the spatial reusability of a directional narrow-beam antenna; dividing two parties communicating on one link into the same time slot to send messages to each other; planning the transmitting and receiving states of node antennas in a time division duplex working mode; planning the antennas of all nodes to be in a state of firstly transmitting and then receiving in one frame; when a signal is transmitted, enabling two communication parties to send services to each other at the same time, and controlling one antenna to be switched through a switch for transmission; when the signal is received, simultaneously switching the antenna to a receiving state; based on satellite spatial multiplexing and large-span propagation delay characteristics, transmitting services in different directions at the same time through time slot arrangement and transceiving state adjustment, and completing conflict-free data packet sending between neighbor nodes.

Description

technical field [0001] The invention belongs to the field of space-based data link communication, and in particular relates to a time-division duplex time slot scheduling method for transmitting a space-based data link with a span of more than 3,000 kilometers. [0002] technical background [0003] In an existing low-orbit constellation system consisting of 60 satellites, the 6 orbital planes of the entire scene are evenly distributed on the equator, and 10 satellites are evenly distributed on each orbital plane. Such as Figure 9 The figure shows that each satellite node is equipped with 4 sets of narrow-beam directional antennas, which are respectively used for communication between the satellite and the front and back satellites on the same orbit, and adjacent satellites on adjacent orbits. Two fixed antennas are arranged at the front and rear of the same track, and two program-controlled antennas are arranged at the left and right of the different track. The beam scannin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/185H04L5/14H04B7/0408H04W72/12
CPCH04B7/0408H04B7/18521H04L5/1469H04W72/1263
Inventor 梁荟萃袁田刘田
Owner 10TH RES INST OF CETC
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