Lossless switching method for inter-satellite data of low-orbit satellites

A data lossless, low-orbit satellite technology, applied in the field of satellite communication, can solve the problems of fast movement of low-orbit satellites, short transmission, single-satellite and single-beam overhead time, etc., to achieve simple and reliable models, high satellite reliability, Facilitate the effect of algorithm strategy adjustment

Active Publication Date: 2020-05-29

中国星网网络应用有限公司

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AI-Extracted Technical Summary

Problems solved by technology

The problem that needs to be solved urgently is that due to the fast movement of low-orbit satellites, the large number of single-satellite beams, and the short overhead time of single-satellite and single-beam, user...

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Method used

(1) a kind of low-orbit satellite inter-satellite data lossless switching scheme of the present invention, send switching request signaling as the last packet data of sending to former satellite at network side, after all data are stored in network controller, in After receiving the configuration completion signaling, the cached data is sent to ensure the reliability of the data during the switching process;

(4) handover control and resource control in a kind of LEO satellite inter-satellite data lossless handover scheme of the present invention are all at the network controller end, are convenient to algorithm strategy adjustment, later stage maintenance, version upgrade etc.;

(5) the handover algorithm in a kind of low-orbit satellite inter-satellite data lossless handover scheme of the present invention uses the minimum hop number handover strategy, compares algorithms such as nearest satellite, strongest signal, the longest visible distance, and minimum hop The digital switching strategy can obtain lower propagation delay and smaller switchin...

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Abstract

The invention discloses a lossless switching method for inter-satellite data of low-orbit satellites, which specifically comprises the following steps that: S1, a user terminal sends a measurement report to a network controller according to the generated measurement report, S2, the network controller executes switching judgment, if switching can be carried out, S3 is executed, and if switching cannot be carried out, S4 is executed, S3, it is judged whether the target satellite resources are allowed to be switched or not, if yes, S5 is executed, and if not, S4 is executed, S4, switching is notcarried out, S4', it is judged whether the user terminal of which the signal stays on the original satellite has a switching continuing demand or not, if so, S1 is executed, and if not, the switchingaction is stopped, S5, the target satellite allocates channel resources to the allowed user terminal, and sends a switching request instruction to the terminal through the service satellite, S6, the terminal receives the switching request and sends switching success information to the target satellite, S7, the network controller immediately releases the temporary storage data and S8, switching iscompleted. The device has the advantages of being simple in structure, smooth in network access and small in loss.

Application Domain

Radio transmissionWireless communication

Technology Topic

TelecommunicationsSatellite data +5

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Examples

Experimental program(1)

Example Embodiment

[0034] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0035] Reference figure 1 , A method for lossless switching of data between low-orbit satellites, which is applied between low-orbit satellites and between relay stations and low-orbit satellites. A single transmission process includes a sending end and a receiving end, and mainly includes the following steps:

[0036] It is applied between user terminals, satellites, and network controllers to realize lossless line switching between user terminals and different satellites. It specifically includes the following steps:

[0037] S1: The user terminal performs measurement according to the measurement configuration provided by the network, generates a measurement report, and sends it to the network controller through the service satellite;

[0038] S2: The network controller executes the switching judgment. If it can be switched, enter S3, if it cannot be switched, then enter S4;

[0039] S3: Determine whether the target satellite resource is allowed to switch, if it is allowed to enter S5, if not allowed, then enter S4;

[0040] S4: Do not switch, stay on the original satellite;

[0041] S4': Determine whether the user terminal whose signal stays on the original satellite has the need to continue switching, if yes, return to S1, if not, end the switching action;

[0042] S5: The target satellite allocates channel resources for the allowed user terminals, and sends a handover request instruction to the terminal through the serving satellite to perform communication control, and immediately stops sending downlink data and temporarily stores it to the serving satellite;

[0043] S6: The terminal receives the handover request, performs downlink synchronization with the target beam of the target satellite, and sends the handover success information to the target satellite;

[0044] S7: The target satellite sends the handover success information to the network controller, and the network controller immediately releases the temporary data;

[0045] S8: The handover is complete.

[0046] Further, the generated measurement report includes at least one available adjacent beam and geographic information of the terminal, where if there are multiple available adjacent beams, they are arranged in descending order.

[0047] Further, when making handover judgments, follow the strategy requirements of the least number of path satellites. When this strategy is implemented, the communication parties periodically check whether there are fewer paths in the courseware satellites than the currently selected paths, and they exist and replace them.

[0048] Further, the process of achieving the least number of path hops includes the following steps:

[0049] A1: The system is initialized, the on-board routing table is generated, and all satellite pairs (SSRC i , SDEST j ) Route and its hop count Hop ij (i=1~N, j=1~N, N is the total number of satellites), when the topology of the constellation network changes, the routing table is automatically refreshed, and the generation and update of routing information is completed by the router on the satellite;

[0050] A2: The establishment of communication connection, assuming that there are m satellites currently covering the original user terminal, it can be recorded as SSRC 1 , SSRC 2 ,..., SSRC m , There are n satellites covering the destination user terminal, denoted as SDEST 1 , SDEST 2 ,..., SDEST n , Select a satellite pair composed of two satellites (SSRC i , SDEST j ), i=1~m, j=1~n, respectively connected to both ends of the communication to establish its communication connection. The number of hops between this satellite pair is the least among all effective satellite pairs, and its elevation angle is the largest among all satellite pairs with the same hop count;

[0051] A3: Handover and connection maintenance. During the communication process, periodically update the set of satellites covering both parties to the communication, and determine whether handover is needed. When one of the following conditions occurs, reselect the satellite pair according to the method of A2 and complete the corresponding Handover: (1) The satellites connected to both ends of the communication appear to be lower than the given minimum elevation angle (or signal-to-noise ratio) and cannot continue to provide services, (2) There are effective connections with fewer hops.

[0052] Further, in step S6, the handover request information received by the terminal includes: measurement configuration, mobility control information element, radio resource configuration, NAS layer and security related information elements.

[0053] Further, when the terminal and the target position are switched, it is synchronized with the downlink of the target beam in the target satellite, and performs radio resource and security configuration. According to the target beam id and random access parameters in the mobile control cell, initiates to the target beam Random access.

[0054] Further, after receiving the terminal random access information, the network controller sends the AGCH to the terminal to indicate contention resolution through the target beam. At this time, the user plane uses the target beam immediately after the random access is completed in the scenario where there is a random access channel. The resource starts sending and receiving data.

[0055] Benefits:

[0056] (1) A low-orbit satellite inter-satellite data lossless switching scheme of the present invention sends a switching request signaling to the original satellite on the network side as the last packet of data sent, and all subsequent data is stored in the network controller. After the signaling is completed, the buffered data is delivered to ensure the reliability of the data during the handover process;

[0057] (2) A low-orbit satellite inter-satellite data lossless handover scheme of the present invention minimizes high-level signaling interaction, and only uses two high-level signaling to complete the inter-satellite handover process during the handover phase, which reduces time overhead as much as possible;

[0058] (3) The low-orbit satellite data lossless switching scheme of the present invention has a simpler and more reliable low-orbit satellite model. The satellite model of this scheme only has a physical layer protocol stack and does not have a high-level protocol. The satellite cost is lower. Higher reliability;

[0059] (4) The switching control and resource control in a low-orbit satellite inter-satellite data lossless switching scheme of the present invention are both at the network controller end, which is convenient for algorithm strategy adjustment, later maintenance, version upgrades, etc.;

[0060] (5) The switching algorithm in a low-orbit satellite inter-satellite data lossless switching scheme of the present invention uses a minimum hop switching strategy. Compared with the nearest satellite, the strongest signal, the longest visible distance and other algorithms, the minimum hop switching strategy It can obtain lower propagation delay and smaller switching frequency, and has better system performance.

[0061] In this solution, the low-orbit satellites are moving fast, the number of single-satellite beams is large, and the overhead time of single-satellite and single-beam is short, so users need to switch frequently. A low-orbit satellite data lossless switching scheme is proposed. Considering the characteristics and overhead of low-orbit satellites, only the physical layer protocol stack is set up in the low-orbit satellite model to achieve the most simplified satellite model; the end-to-end communication method is designed, and two high-level signaling interactions are used to complete the handover, reducing signaling overhead And transmission delay; set the key information elements that need to be carried in the signaling interaction process, clarify the information format in the handover; and select the appropriate handover decision algorithm, and use the minimum hop number decision algorithm to obtain lower propagation delay and comparison Small switching frequency has better system performance.

[0062] The above are only preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited to this. Anyone familiar with the technical field within the technical scope disclosed by the present invention, according to the technical solution of the present invention Equivalent replacements or changes to its inventive concept should all fall within the protection scope of the present invention.

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Classification and recommendation of technical efficacy words

Guaranteed reliability
Reduce time overhead

Lossless switching method for inter-satellite data of low-orbit satellites

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

Image

Examples

Example Embodiment

PUM

Description & Claims & Application Information

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