Satellite communication system mobile terminal access method based on open-loop power control
A satellite communication system and mobile terminal technology, applied in the field of mobile terminal access of satellite communication systems, can solve the problem of not considering transmission power, etc., and achieve the effects of convenient and rapid opening, simple implementation, and mutual interference mitigation.
Active Publication Date: 2021-06-11
军事科学院系统工程研究院网络信息研究所
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The above-mentioned patents are mainly aimed at optimizing the time parameters in the random access and retransmission process to improve the efficiency of random access, but they do not consider reducing co-channel interference and improving Access success rate
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[0017] The present invention will be described in detail below in conjunction with the accompanying drawings.
[0018] Such as figure 1 As shown, the present invention describes a satellite communication system mobile terminal access method based on open-loop power control, including the following steps:
[0019] S1, the mobile terminal continues to receive the broadcast message from the ground gateway station of the satellite communication system, and records the initial power value and retransmission power value specified in the broadcast message;
[0020] Assuming that the number of access frequency points of the satellite communication system is N, the total number of mobile terminals is U, the generation time of mobile terminal access requests obeys the Poisson distribution, and the average number of access requests generated by mobile terminals within an information frame is recorded as arrival rate, the expression of arrival rate is α i λ, where λ is the basic arrival...
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The invention discloses a satellite communication system mobile terminal access method based on open-loop power control, which comprises the following steps that: a mobile terminal randomly selects an access application channel frequency point, and sends an access application message after waiting for a random duration according to an initial message power specified by a broadcast message; and if interference occurs, the mobile terminal sets the power as retransmission power and resends the access application message after waiting for a random duration, and if the number of retransmission times in the same application channel exceeds a threshold value, the channel is replaced, the message power is recovered to the initial power, and a new round of access application is performed. According to the method, open-loop power control is adopted, the signal strength during initial access and retransmission access of the terminal is set respectively, same-frequency interference from other terminals can be reduced, and the success rate of a random access stage of a user is improved; and a random time delay sending mode and a random waiting time length mode are adopted, arrival distribution of messages can be dispersed when a large number of terminals are accessed in a concurrent mode, and mutual interference caused by uneven message distribution is relieved.
Description
technical field [0001] The invention belongs to the field of satellite mobile communication, and in particular relates to a satellite communication system mobile terminal access method based on open-loop power control. Background technique [0002] Satellite communication plays an irreplaceable and important role in the field of information communication due to its wide coverage, unaffected by terrain and no need to rely on fixed base stations on the ground. In the working process of the satellite communication system, due to uneven distribution of user access requests or natural disasters and other emergencies, it is inevitable that multiple terminals will send access request messages to the same access channel at the same frequency , which will lead to co-channel interference between sent messages. When the number of terminals requesting access at the same time is large, the same-channel interference problem will be particularly serious, resulting in a significant drop in...
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IPC IPC(8): H04W48/10H04W52/10H04W52/32H04W74/08H04B7/185
CPCH04B7/18513H04W48/10H04W52/10H04W52/325H04W74/085
Inventor 何元智刘韵
Owner 军事科学院系统工程研究院网络信息研究所