Random access method and device suitable for satellite communication
A technology of random access and satellite communication, applied in the field of communication, can solve the problems of random access failure, unable to meet the needs of satellite communication, etc.
Active Publication Date: 2022-05-13
HUAWEI TECH CO LTD
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[0004] However, according to the round-trip transmission delay of the signal between the UE and the satellite calculated according to the satellite's altitude, coverage area, and radio wave transmission delay, it can be known that the UE at the edge of the satellite coverage area may not be able to receive the signal within the window specified by the agreement. To Msg 2, resulting in random access failure, unable to meet the needs of satellite communications
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[0050] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below in conjunction with the accompanying drawings in this application. Obviously, the described embodiments are part of the embodiments of this application , but not all examples. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.
[0051] figure 1 Schematic diagram of the satellite communication scenario for this application, such as figure 1 As shown, the satellite in the air communicates with the UE on the ground, wherein the protocol adopted by the satellite is a protocol stack compatible with the Long Term Evolution (LTE) protocol or the NR protocol, and the UE is an ordinary mobile terminal or a dedicated The communication process between the...
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The present application provides a random access method and device suitable for satellite communication. This application is applicable to the random access method of satellite communication, including: obtaining the round-trip transmission delay t of the signal between the terminal equipment UE and the satellite RTD ;According to the round-trip transmission delay, the random access parameters are obtained, and the random access parameters include one or more of the following: t X , t Y , t backoff and t subframe , where t X Indicates the time length between the moment when the UE sends the preamble of random access and the moment when the UE starts to receive the random access response RAR, t Y Indicates the duration of the window for UE to receive RAR, t backoff Indicates the duration between the moment when the UE stops receiving RAR and the moment when the UE sends the random access preamble again, t subframe Indicates the subframe duration; according to the random access parameters, the UE receives RAR. This application ensures that the time when the RAR arrives at the UE falls within the window for the UE to receive the RAR, thereby improving the success rate of random access of the UE and meeting the requirements of satellite communication.
Description
technical field [0001] The present application relates to communication technology, in particular to a random access method and device suitable for satellite communication. Background technique [0002] Satellite communication has a wider coverage than traditional communication systems, and can overcome natural geographical obstacles such as oceans, deserts, and mountains. Therefore, satellite communication can be used as an effective supplement to traditional communication networks. Satellite communication systems can be divided into the following three types according to different orbital heights: high-orbit (Geostationary Earth Orbit, referred to as: GEO) satellite communication system, also known as geostationary orbit satellite system, medium-orbit (Medium Earth Orbit, referred to as: MEO) satellite Communication system and low earth orbit (Low Earth Orbit, referred to as: LEO) satellite communication system. The orbit height of the GEO satellite communication system i...
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IPC IPC(8): H04W74/08H04B7/185
CPCH04W74/0833H04B7/18586H04B7/185H04B7/00H04W56/009H04B7/18543H04B7/18589H04W84/06
Inventor 陈军刘鹏黄晶晶王光健
Owner HUAWEI TECH CO LTD