A method for building a connection of a spatial terahertz communication network based on multi-beam scanning

Abstract

The application provides a space terahertz communication network link establishment method based on multi-beam scanning, which comprises the following steps: single handshake synchronization initiated by the receiving party, adaptive multi-beam sector scanning, waiting time calculation, space division multiplexing strategy, and parallel scanning and sector allocation. The single handshake synchronization mechanism reduces the round-trip propagation delay, the adaptive multi-beam sector scanning technology improves the scanning efficiency, and the space division multiplexing strategy realizes the parallel scanning of multiple beams, so that the rapid link establishment in the space terahertz communication network is realized. The method has the advantages of rapidity, high efficiency and strong adaptability, and is suitable for the high-speed dynamic change scene of the space terahertz communication network, and provides a new solution for the development of space communication technology.

Description

Technical Field

[0001] This invention relates to the field of satellite communication network technology, and in particular to a method for establishing links in a space terahertz communication network based on multi-beam scanning. Background Technology

[0002] With the rapid development of space communication technology, especially the rise of Space Information Network (STIN) composed of geostationary orbit (GEO) and low Earth orbit (LEO) satellites, higher demands are placed on high-speed, dynamically changing link establishment and switching technologies. Traditional link establishment methods, such as the two-way handshake mechanism based on the IEEE 802.15.3d protocol, suffer from large round-trip propagation delays and long link establishment times, making it difficult to meet the STIN's requirements for fast response and low latency.

[0003] Furthermore, space terahertz (THz) communication technology, due to its extremely high bandwidth and transmission rate, has become an important development direction for future space communication. However, the narrow beamwidth and strong directivity of THz communication make beam alignment and link establishment technical challenges. Traditional fixed sector scanning methods are not only time-consuming but also inefficient, making it difficult to adapt to the high-speed dynamic changes of STIN.

[0004] Therefore, developing a link establishment method for spatial terahertz communication networks that can quickly establish links and adapt to the high-speed dynamic changes of STIN has become an urgent technical problem to be solved.

[0005] Chinese invention CN113890628A proposes a terahertz networking media access control method based on one-way handshake, but does not consider the coordination and allocation of multiple beams. Summary of the Invention

[0006] This invention discloses a method for establishing links in a spatial terahertz communication network based on multi-beam scanning.

[0007] S1, in a space terahertz communication network, geostationary orbit (GEO) satellites act as receiving nodes, periodically broadcasting Clear-To-Send (CTS) data packets. The receiving nodes initiate a single handshake for synchronization to notify low Earth orbit (LEO) satellite nodes of the availability of GEO satellites, thereby reducing the overhead of round-trip propagation delay.

[0008] S2, after receiving the CTS data packet, the LEO satellite node sends the data packet to the GEO satellite according to the corresponding access control policy.

[0009] S3, GEO satellites employ highly directional multi-beam antennas in THz communication, dividing space into... There are 3 sectors, where θ is the THz beamwidth. According to the characteristics of THz links in spatial terahertz communication networks, θ should satisfy the following formula: in, The demodulation threshold is Nb, the noise power is Lfs, the path transmission loss is Pt, and the transmit power is Pt.

[0010] S4, the GEO satellite is designed with a waiting time. ,like If no data packet is received from the LEO satellite after the timeout, the current sector is skipped and the beam is rotated to the next sector for scanning, in order to reduce scanning time and improve MAC efficiency. in, Set a sufficiently long time interval to ensure that the furthest LEO satellite node can receive the CTS and respond. ,in For the transmission delay of CTS messages, To delay the transmission time, The retreat time is random.

[0011] S5, GEO satellites have A THz beam is used, employing a spatial division multiplexing strategy to evenly distribute sectors to each beam, allowing multiple beams to scan in parallel, further reducing scanning time.

[0012] The present invention has the following advantages: 1. This invention employs adaptive multi-beam sector scanning technology, dynamically adjusting the scanning strategy based on the waiting time, skipping unresponsive sectors, effectively reducing scanning time and improving MAC efficiency. It utilizes multiple THz beams from GEO satellites for spatial multiplexing, with multiple beams scanning in parallel, further shortening the scanning time and improving network response speed.

[0013] 2. This invention is applicable to satellite nodes at different orbital altitudes, and can flexibly respond to the high-speed dynamic changes of STIN, thereby improving the stability and reliability of the communication network. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the connection establishment of a space terahertz communication network based on multi-beam scanning in this invention; Figure 2 This is a schematic diagram of a single handshake in this invention. Detailed Implementation

[0015] The present invention will now be described in detail with reference to the accompanying drawings.

[0016] As shown in the figure, this invention discloses a link establishment method for spatial terahertz communication networks based on multi-beam scanning, such as... Figure 1 As shown, it mainly includes the following steps.

[0017] S1, in a space terahertz communication network, geostationary orbit (GEO) satellites act as receiving nodes, periodically broadcasting Clear-To-Send (CTS) data packets. The receiving nodes initiate a single handshake for synchronization to notify low Earth orbit (LEO) satellite nodes of the availability of GEO satellites, thereby reducing the overhead of round-trip propagation delay.

[0018] S2, after receiving the CTS data packet, the LEO satellite node sends the data packet to the GEO satellite according to the corresponding access control policy.

[0019] S3, GEO satellites employ highly directional multi-beam antennas in THz communication, dividing space into... There are 3 sectors, where θ is the THz beamwidth. According to the characteristics of THz links in spatial terahertz communication networks, θ should satisfy the following formula: in, The demodulation threshold is Nb, the noise power is Lfs, the path transmission loss is Pt, and the transmit power is Pt.

[0020] S4, the GEO satellite is designed with a waiting time. ,like If no data packet is received from the LEO satellite after the timeout, the current sector is skipped and the beam is rotated to the next sector for scanning, in order to reduce scanning time and improve MAC efficiency. in, Set a sufficiently long time interval to ensure that the furthest LEO satellite node can receive the CTS and respond. ,in For the transmission delay of CTS messages, To delay the transmission time, The retreat time is random; S5, GEO satellites have A THz beam is used, employing a spatial division multiplexing strategy to evenly distribute sectors to each beam, allowing multiple beams to scan in parallel, further reducing scanning time.

[0021] The present invention has been described in detail above with reference to the accompanying drawings. However, those skilled in the art should understand that the specification is for interpreting the claims, and the scope of protection of the present invention is determined by the claims. Any modifications, equivalent substitutions, and improvements made based on the present invention should be within the scope of protection claimed.

Claims

1. A method for establishing links in a spatial terahertz communication network based on multi-beam scanning, characterized in that, include: S1, in the space terahertz communication network, the geostationary orbit (GEO) satellite acts as the receiving node, and regularly broadcasts Clear-To-Send (CTS) data packets. The receiving node initiates a single handshake for synchronization to notify the low Earth orbit (LEO) satellite node of the availability of the GEO satellite, thereby reducing the overhead of round-trip propagation delay. S2, after receiving the CTS data packet, the LEO satellite node sends the data packet to the GEO satellite according to the corresponding access control policy; S3, GEO satellites employ highly directional multi-beam antennas in THz communication, dividing space into... There are 3 sectors, where θ is the THz beamwidth. According to the characteristics of THz links in space terahertz communication networks, θ should satisfy: in, To demodulation threshold, N b For noise power, L fs For path transmission loss, P t This refers to the transmission power. S4, the GEO satellite is designed with a waiting time. ,like If no data packet is received from the LEO satellite after the timeout, the current sector is skipped and the beam is rotated to the next sector for scanning, in order to reduce scanning time and improve MAC efficiency. in, Set a sufficiently long time interval to ensure that the furthest LEO satellite node can receive the CTS and respond. ,in For the transmission delay of CTS messages, To delay the transmission time, The retreat time is random; S5, GEO satellites have A THz beam is used, employing a spatial division multiplexing strategy to evenly distribute sectors to each beam, allowing multiple beams to scan in parallel, further reducing scanning time.

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