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User random access method and device based on ephemeris broadcast auxiliary positioning

An auxiliary positioning and random access technology, which is applied in the field of satellite mobile communication, can solve the problems of increasing the sensitivity of carrier frequency offset, increasing the access power, and configuring the global positioning system for the terminal, so as to achieve easy access and improve power consumption. Estimated Performance Effects

Active Publication Date: 2019-11-05
SOUTHEAST UNIV
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Problems solved by technology

However, we cannot assume that all terminals are equipped with GPS
In addition, the recent 3GPP meeting proposal and related documents propose to redesign the access preamble, such as designing a ZC (Zadoff-Chu) sequence with a longer duration, but this will lead to an increase in access power and increase Sensitivity to carrier frequency offset

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  • User random access method and device based on ephemeris broadcast auxiliary positioning
  • User random access method and device based on ephemeris broadcast auxiliary positioning
  • User random access method and device based on ephemeris broadcast auxiliary positioning

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Embodiment Construction

[0021] The technical solution of the present invention will be further introduced below in conjunction with the accompanying drawings and specific embodiments.

[0022] Such as figure 1 As shown, the embodiment of the present invention discloses a user random access method based on ephemeris broadcast assisted positioning, including the following steps:

[0023] S1: The ground terminal receives the downlink synchronization sequence and ephemeris information periodically broadcast by the satellite. In this implementation, one or more low-orbit satellites can be arranged to cover the same area, and the satellite broadcasts the 5G downlink master synchronization sequence at a period of 50ms, and broadcasts its current position information, that is, the ephemeris.

[0024] S2: In the downlink time-frequency synchronization phase, the ground terminal periodically obtains timing information and Doppler frequency offset information through the time-frequency synchronization algorith...

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Abstract

The invention discloses a user random access method and device based on ephemeris broadcast auxiliary positioning, which are applied to mobile communication system for satellite. A ground terminal receives a downlink synchronization sequence and an ephemeris periodically broadcasted by a satellite; in a downlink time-frequency synchronization stage, a signal arrival time difference and a Doppler frequency offset sequence are obtained, the Doppler frequency offset sequence is converted into another group of timing information, and in combination with a satellite ephemeris table, a satellite-to-ground distance is estimated and satellite-to-ground propagation time delay is predicted to serve as a random access uplink timing advance. According to the invention, a positioning algorithm based ontime arrival difference is used; the established model can cope with various satellite-ground distance measurement conditions in a satellite scene, so that the timing advance error of each terminal signal can be in a cyclic prefix, and the orthogonality between uplink signals of different terminal users in a cell range when orthogonal frequency division multiple access transmission is adopted isensured. Compared with a random access timing advance scheme redesigned by a leader sequence, the method does not need to increase access power consumption and is easy to implement.

Description

technical field [0001] The invention belongs to the field of satellite mobile communication, and relates to a user random access method and device based on ephemeris broadcast assisted positioning. Background technique [0002] In recent years, satellite communication has ushered in a new round of development boom in the world, and the fifth generation of ground (5G, 5 th Generation) mobile communication technology is about to enter commercial use, and the integration of satellite communication and terrestrial 5G has become a new hot topic in the communication industry. 5G mobile communication technology meets the demand for greater communication capacity, faster data rate, lower transmission delay and better quality of service, while the satellite mobile communication system can provide effective supplement and expansion for the terrestrial network. Therefore, the integration of the low-orbit satellite mobile communication system and the terrestrial 5G mobile communication...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W56/00H04W74/08
CPCH04W56/005H04W74/0833Y02D30/70
Inventor 王闻今陈婷婷李灵瑄高琳娜尤力江彬高西奇
Owner SOUTHEAST UNIV
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