CN114158056A - Quick access method for low-orbit constellation system - Google Patents

Quick access method for low-orbit constellation system Download PDF

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Publication number
CN114158056A
CN114158056A CN202111410824.2A CN202111410824A CN114158056A CN 114158056 A CN114158056 A CN 114158056A CN 202111410824 A CN202111410824 A CN 202111410824A CN 114158056 A CN114158056 A CN 114158056A
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Prior art keywords
terminal
base station
signal
time
access
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CN202111410824.2A
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王力男
肖永伟
王力权
王涛
王雨晴
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CETC 54 Research Institute
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CETC 54 Research Institute
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/28—Cell structures using beam steering
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/06—Airborne or Satellite Networks

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Radio Relay Systems (AREA)

Abstract

The invention relates to a quick access method of a low earth orbit constellation system in the field of satellite communication, which comprises the following steps: the terminal sends an access signal to the base station in a same-frequency working area, and the base station determines a beam where the terminal is located and estimates timing advance by detecting the position and the size of a related peak value; the base station sends a response message to the terminal in the same-frequency working area of the corresponding beam; and the terminal acquires the frequency point for receiving the PSS configured by the base station in the response message and receives the PSS signal on the frequency point, thereby acquiring downlink synchronization and further determining the time for sending the uplink signal by the user. Aiming at a low-orbit satellite communication system, the invention can meet the requirement of quick access of a user terminal and can save the synchronous signal overhead.

Description

Quick access method for low-orbit constellation system
Technical Field
The invention relates to the field of wireless communication, in particular to a quick access method of a low-orbit constellation system.
Background
In recent years, satellite communication systems have been rapidly developed. Among them, a Low Earth Orbit (LEO) satellite communication system occupies an important position due to its unique superiority. Compared with a ground mobile communication system, the LEO satellite communication system has wider signal coverage range; compared with a high orbit (GEO) satellite communication system and a medium orbit (MEO) satellite communication system, the LEO satellite communication system is more flexible in networking, low in satellite orbit height and small in satellite-ground link transmission delay, and can form a space-ground integrated communication network together with a GEO satellite, an MEO satellite and a ground network.
Due to the limited energy of the satellite system, when the total power of the transmitted signals of the downlink of the satellite system is constant, the narrower the beam is, the stronger the satellite communication capability is, but this also means that the coverage area of the satellite beam is smaller, so that the advantages of the satellite communication cannot be fully exerted. In order to effectively improve the equivalent coverage area of satellite beams on the premise of not reducing the satellite communication capacity, a phased array technology is applied to a satellite communication system, and different areas are covered in a time-sharing and on-demand manner by utilizing the agile beam of the phased array.
The access flow in the ground mobile communication system and the period agility of the base station side transmission beam in the satellite system shown in fig. 1 may make the terminal access time longer, so a process suitable for the fast access of the low-earth constellation system needs to be designed, the delay of the initial access process of the user terminal is reduced, and the synchronization signal overhead can be saved.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the method has the advantages that the low-orbit satellite system is frequently switched, the satellite-to-ground link delay is large, the switching delay is high and the like, communication quality of users is affected, and in order to solve the problems, the method for quickly accessing the low-orbit constellation system is provided, and requirements of quick access of user terminals are met.
In order to solve the problems, the technical scheme adopted by the invention is as follows:
a fast access method of a low-orbit constellation system comprises the following steps:
(1) a section of frequency band is pre-configured on a frequency domain to serve as a known same-frequency working area of a terminal and a base station, and when the terminal needs to access a network, an access signal is sent to the base station on the known same-frequency working area;
(2) a base station receives an access signal sent by a terminal in a same-frequency working area, determines a terminal ID by detecting the access signal corresponding to a correlation peak value, determines a time offset delta T according to the position offset of the correlation peak value relative to a detection window, and determines a beam where the terminal sending the access signal is located currently according to the amplitude of the correlation peak value;
(3) a base station sends a response message to a terminal in a beam where the terminal is currently located and on a same-frequency working area, wherein the response message comprises a terminal ID, a time offset delta T and a frequency point configured for the terminal to receive a PSS;
(4) and the terminal receives the downlink PSS signal sent by the base station on the configured PSS frequency point to obtain downlink synchronization, thereby determining the timing position of the terminal and determining the time when the terminal sends the uplink service signal.
Further, in step (3), the time when the terminal sends the uplink service signal is determined, and the specific manner is as follows:
performing sliding correlation on the received PSS signal and the local time domain PSS signal, searching the position of a correlation peak value, and determining the starting time of receiving a downlink subframe and the time t of sending an access signal by a terminalsDifference t between0According to the time offset DeltaT and the difference T0Calculating a time offset
Figure BDA0003373741480000021
Obtaining the timing position t of the downlink subframes+tnAnd calculating the one-way transmission time delay tdelay＝ΔT+tnIf the time t is t, the terminal sends the uplink service signals+t0-2tdelay。
The invention has the beneficial effects that:
the invention is different from the initial access process of the ground mobile communication system, can support the non-periodic agility of the transmitting wave beam at the base station side, realizes the rapid wave beam selection according to the access signal transmitted by the user needing to be accessed, and simultaneously can omit the transmitting SSS signal.
Drawings
Fig. 1 is a schematic diagram of an initial access procedure used in a terrestrial mobile communication system;
fig. 2 is a schematic diagram of a fast access procedure proposed by the present invention;
fig. 3 is a schematic diagram of uplink and downlink transmission timing alignment according to the present invention.
Detailed Description
The technical solution of the present invention is described below by way of specific embodiments with reference to the accompanying drawings, as shown in fig. 2, comprising the steps of:
(1) firstly, a section of frequency band is pre-configured on a frequency domain as a same-frequency working area known by both a user terminal and a base station, and when t issWhen a user needs to access a network at any time, an access signal is transmitted to a base station on the same-frequency working area;
(2) the base station receives uplink access signals on a same-frequency working area and carries out correlation detection, and due to the orthogonal characteristics of different access signals, the base station can determine a user terminal ID through the access signals corresponding to the detected correlation peak values, can determine a time offset delta T according to the position offset of the correlation peak values relative to a detection window, and can determine a beam i where the terminal sending the access signals is located currently according to the amplitude of the correlation peak values; if the time offset between the detected correlation peak value and the timing starting time of the downlink subframe is 1.5ms, the delta T is 1.5 ms;
(3) the base station sends a response message to the user terminal in the same-frequency working area of the beam i, wherein the response message comprises the terminal ID, the time offset delta T and the frequency point for receiving the PSS configured for the terminal, which are determined in the step (2);
(4) the terminal receives the PSS signal on the frequency point configured by the base station, and the relative peak position searched after the sliding correlation is carried out on the received signal and the local time domain PSS signal can be obtainedAnd time tsDifference t between0If t is measured09.1ms, it can be obtained from fig. 3
Figure BDA0003373741480000041
Therefore, the timing position of the downlink subframe can be determined to be ts+3.8ms, and further according to the time offset delta T, the one-way transmission time delay T can be determineddelay＝ΔT+tn5.3ms, and can determine the time t of the user transmitting the uplink service signals+t0-2tdelay＝ts-1.5ms。
The quick access process of the low-orbit constellation system is completed.

Claims (2)

1. A fast access method of a low-orbit constellation system is characterized by comprising the following steps:
(1) a section of frequency band is pre-configured on a frequency domain to serve as a known same-frequency working area of a terminal and a base station, and when the terminal needs to access a network, an access signal is sent to the base station on the known same-frequency working area;
(2) a base station receives an access signal sent by a terminal in a same-frequency working area, determines a terminal ID by detecting the access signal corresponding to a correlation peak value, determines a time offset delta T according to the position offset of the correlation peak value relative to a detection window, and determines a beam where the terminal sending the access signal is located currently according to the amplitude of the correlation peak value;
(3) a base station sends a response message to a terminal in a beam where the terminal is currently located and on a same-frequency working area, wherein the response message comprises a terminal ID, a time offset delta T and a frequency point configured for the terminal to receive a PSS;
(4) and the terminal receives the downlink PSS signal sent by the base station on the configured PSS frequency point to obtain downlink synchronization, thereby determining the timing position of the terminal and determining the time when the terminal sends the uplink service signal.
2. The fast access method of a low-orbit constellation system according to claim 1, wherein the time when the terminal sends the uplink service signal is determined in step (3), and the specific manner is as follows:
performing sliding correlation on the received PSS signal and the local time domain PSS signal, searching the position of a correlation peak value, and determining the starting time of receiving a downlink subframe and the time t of sending an access signal by a terminalsDifference t between0According to the time offset DeltaT and the difference T0Calculating a time offset
Figure FDA0003373741470000011
Obtaining the timing position t of the downlink subframes+tnAnd calculating the one-way transmission time delay tdelay＝ΔT+tnIf the time t is t, the terminal sends the uplink service signals+t0-2tdelay。
CN202111410824.2A 2021-11-25 2021-11-25 Quick access method for low-orbit constellation system Pending CN114158056A (en)

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Citations (6)

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CN110611949A (en) * 2019-09-12 2019-12-24 成都天奥集团有限公司 Method for predicting uplink timing advance gateway station of satellite communication system
CN112653499A (en) * 2019-10-11 2021-04-13 大唐移动通信设备有限公司 Network access method and device of terminal, electronic equipment and storage medium
CN113038618A (en) * 2021-05-20 2021-06-25 银河航天(北京)网络技术有限公司 Satellite communication system and method for accessing satellite communication system
CN113114333A (en) * 2021-03-11 2021-07-13 中国电子科技集团公司第五十四研究所 Method and device for rapidly accessing mobile communication terminal of synchronous orbit satellite
CN113612527A (en) * 2021-09-08 2021-11-05 华力智芯(成都)集成电路有限公司 Initial synchronization method for low-earth-orbit satellite mobile communication system

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Publication number Priority date Publication date Assignee Title
CN107820258A (en) * 2016-09-14 2018-03-20 华为技术有限公司 Sending method, synchronous method, base station and the UE of signal
CN110611949A (en) * 2019-09-12 2019-12-24 成都天奥集团有限公司 Method for predicting uplink timing advance gateway station of satellite communication system
CN112653499A (en) * 2019-10-11 2021-04-13 大唐移动通信设备有限公司 Network access method and device of terminal, electronic equipment and storage medium
CN113114333A (en) * 2021-03-11 2021-07-13 中国电子科技集团公司第五十四研究所 Method and device for rapidly accessing mobile communication terminal of synchronous orbit satellite
CN113038618A (en) * 2021-05-20 2021-06-25 银河航天(北京)网络技术有限公司 Satellite communication system and method for accessing satellite communication system
CN113612527A (en) * 2021-09-08 2021-11-05 华力智芯(成都)集成电路有限公司 Initial synchronization method for low-earth-orbit satellite mobile communication system

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