Method for adjusting random access sequence and user terminal
A technology of random access sequence and user terminal, applied in the field of satellite mobile communication, can solve the problems of increasing the difficulty of signal detection, the difficulty of use, coding and detection technology, etc., to meet the needs of large-capacity communication and improve the success of access. rate, and the effect of reducing the number of trials
Active Publication Date: 2019-10-01
BEIJING UNIV OF POSTS & TELECOMM
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[0004] However, a substantial increase in signal length leads to greater resource consumption, lower flexibility, and increased difficulty in signal detection
In addition, for the method of adding control information to the PRACH signal, due to the many coding and detection technologies involved, it is difficult to use
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[0028] 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 some of the embodiments of the present invention, not all of them. Based on The embodiments of the present invention and all other embodiments obtained by persons of ordinary skill in the art without creative efforts all belong to the protection scope of the present invention.
[0029] figure 1 It shows the random access sequence format of the user terminal at the center of the beam and the user terminal at the edge of the beam according to the transmission delay. The present invention is based on the LTE system, so the satellite random access sequence format is consistent with the ground, and the random access sequence time slot includes a cyclic prefix CP, a preamble sequence SEQ and a guard interval GT.
[0030] The du...
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The invention provides a method for adjusting a random access sequence format and a user terminal. The method comprises the steps that the user terminal acquires location information of a spot beam center of an area in which the user terminal is; according to the location information, delay inequality deviation of transmission of the random access sequence from the spot beam center to the user terminal is determined; according to a false dismissal probability and a false alarm probability, the time duration of a preamble of the random access sequence is determined; a sampling frequency of the random access sequence is acquired, and the length of the random access sequence is determined according to the sampling frequency and the time duration of the preamble; according to the delay inequality deviation, the time duration of the preamble and the length of the random access sequence, the cyclic shift number is determined; and the user terminal adjusts the random access sequence according to the delay inequality deviation, the time duration of the preamble, the length of the random access sequence and the cyclic shift number. The method readjusts relevant parameters of the random access sequence, thereby effectively lowering testing number of times, improving success rate of first access, and meeting the communication requirement of high speed, reliability and large capacity.
Description
technical field [0001] The invention relates to the field of satellite mobile communication, in particular to a method for adjusting a random access sequence and a user terminal. Background technique [0002] With the rapid development of satellite communication technology, 3GPP LTE (3rd Generation Partnership Project Long Term Evolution, 3rd Generation Partnership Project Long Term Evolution) is introduced into the satellite communication system, and the construction of a new generation of satellite mobile communication system based on LTE has become a mainstream trend. In the satellite mobile communication system, long delay and wide coverage are its main characteristics, which makes the random access technology of terrestrial LTE unable to be directly applied to the satellite mobile communication system. [0003] At present, the introduction of the LTE system into the satellite communication system is in its infancy. Considering the characteristics of the satellite commun...
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IPC IPC(8): H04W56/00H04W74/08H04W84/06
Inventor 崔高峰何异舟王建李鹏绪常瑞君王卫东
Owner BEIJING UNIV OF POSTS & TELECOMM