CN-122026937-A - Vehicle-mounted terminal communication method and device for low-orbit internet satellite communication

Abstract

The invention provides a vehicle-mounted terminal communication method and device for low-orbit internet satellite communication, and belongs to the technical field of satellite communication. The method comprises the steps of providing a plurality of omnidirectional antenna components and independent radio frequency channels for a vehicle-mounted communication terminal, obtaining a first sequencing sequence by measuring the received signal intensity of each antenna receiving channel, determining a first antenna unit by the vehicle-mounted terminal according to the first sequencing sequence, completing a communication access flow by using the first antenna unit, reporting first information to a system side, determining whether to communicate in a carrier aggregation mode or not by the system side according to the received first information, and issuing second information to the vehicle-mounted terminal, and determining to communicate in a first working mode or a second working mode by the vehicle-mounted terminal according to the received second information.

Inventors

• FENG TIANMING
• LIN ZIXIAN
• WANG GUANGYUAN
• LU XIANGYU
• PU ZHI
• LI YAOCHEN
• WANG LIQUAN
• SHEN XIANG
• DAI LIN
• LI XINGCHEN

Assignees

• 中国电子科技集团公司第五十四研究所
• 河北神舟卫星通信股份有限公司

Dates

Publication Date

20260512

Application Date

20260413

Claims (13)

1. 1. The vehicle-mounted multi-antenna terminal communication method for low-orbit internet satellite communication is characterized by comprising the following steps of: Step 1, powering on a vehicle-mounted terminal provided with N omnidirectional antenna components, searching low-orbit internet satellite broadcasting signals, and measuring the received signal intensity of each antenna receiving channel to obtain a first ordering sequence, wherein N is more than or equal to 2, and N is a positive integer; Step 2, the vehicle-mounted terminal determines a first antenna unit according to the first sequencing sequence, completes a communication access flow by using the first antenna unit, and reports first information to a system side; Step 3, the system side decides whether to communicate in a carrier aggregation mode according to the received first information, and issues second information to the vehicle-mounted terminal; and 4, the vehicle-mounted terminal determines to communicate in the first working mode or the second working mode according to the received second information.
2. 2. The method for vehicle-mounted multi-antenna terminal communication for low-orbit internet satellite communication according to claim 1, wherein the first ordering sequence in step 1 is a sequence formed by arranging all antennas in descending order of the received signal strength of the first beam, and the first beam is a beam corresponding to a broadcast signal with the highest strength among all broadcast signals measured from all antennas in a broadcast search time window.
3. 3. The method for vehicle-mounted multi-antenna terminal communication for low-orbit internet satellite communication according to claim 1, wherein in the step 2, the first antenna unit is an antenna component corresponding to a first bit in a first ordering sequence, the first information comprises a terminal capability identifier, the terminal capability identifier is used for indicating the maximum carrier aggregation number Mmax supported by the vehicle-mounted terminal, mmax is greater than or equal to 1, and Mmax is a positive integer.
4. 4. The method for vehicle-mounted multi-antenna terminal communication for low-orbit internet satellite communication according to claim 1, wherein in step 3, the second information comprises a multi-carrier communication identifier issued by the system side terminal.
5. 5. A vehicle-mounted multi-antenna terminal communication method for low-orbit internet satellite communication according to claim 3, wherein the first operation mode in step 4 comprises the steps of: step 51, the vehicle-mounted terminal reports third information to the system side, wherein the third information comprises the number M of carriers which can be supported by the terminal under the current channel condition, M is less than or equal to Mmax, and M is a positive integer; Step 52, after receiving the third information, the system side transmits fourth information to the vehicle-mounted terminal, wherein the fourth information indicates the number of M carriers used for communication with the vehicle-mounted terminal, and M is less than or equal to M and is a positive integer; Step 53, according to the fourth information and the first ordering sequence, the vehicle-mounted terminal allocates respective antenna receiving and transmitting channels for m carriers, thereby completing subsequent communication service with the system side; And step 54, the vehicle-mounted terminal measures the received signal strength of the N omnidirectional antenna components at fixed time, updates the first ordering sequence, reports third information to the system side, and returns to the execution step 52 until the communication is finished.
6. 6. The method for vehicle-mounted multi-antenna terminal communication for low-orbit internet satellite communication according to claim 1, wherein the second operation mode in step 4 comprises the steps of: Step 61, the vehicle-mounted terminal determines a first antenna unit according to the first sequencing sequence, and completes subsequent communication service with the system side by using the first antenna unit; Step 62, the vehicle-mounted terminal measures the received signal strength of the N omni-directional antenna components at fixed time and updates the first ordering sequence, and returns to step 61 until the communication is finished.
7. 7. The method for vehicle-mounted multi-antenna terminal communication for low-orbit internet satellite communication according to claim 5, wherein in the first communication mode, the value of the carrier number M is calculated by the current available antenna number N and the maximum carrier number Nc which can be processed by each antenna channel and is determined when the vehicle-mounted terminal is designed, specifically, m=n×nc, where N is less than or equal to N, nc is less than or equal to Mmax, and N and Nc are both positive integers.
8. 8. The method for vehicle-mounted multi-antenna terminal communication for low-orbit internet satellite communication according to claim 7, wherein the number N of currently available antennas is the number of omni-directional antenna elements having a received signal strength greater than a given signal strength threshold Th among the N omni-directional antenna elements.
9. 9. The method for vehicle-mounted multi-antenna terminal communication for low-orbit internet satellite communication according to claim 7, wherein in step 53, m carriers are allocated to the currently available n omni-directional antenna component transceiver channels according to a predetermined rule, and the communication service is completed by the n omni-directional antenna components.
10. 10. The method for vehicle-mounted multi-antenna terminal communication for low-orbit internet satellite communication according to claim 9, wherein in step 53, after m carriers are allocated to n omni-directional antenna component transceiving channels, the following operations are performed in the signal transceiving process: When the vehicle-mounted terminal receives signals, radio frequency front end processing and down-conversion operation are carried out on antenna receiving signals to obtain baseband signals, carrier wave and channel demapping operation is carried out on the baseband signals on n omnidirectional antenna component receiving channels to obtain m paths of receiving signals, m paths of receiving signals are obtained after demodulation and decoding of the baseband receiving processing is carried out on the m paths of receiving signals in parallel, and then the m paths of information are synthesized and reported to a vehicle-mounted terminal upper layer on the way through parallel-serial conversion; When the vehicle-mounted terminal transmits signals, one path of information from a high layer of the vehicle-mounted terminal is divided into m paths of information through serial-parallel conversion, the m paths of information are subjected to baseband transmitting processing of coding and modulation in parallel, the m paths of information are mapped to n omni-directional antenna component transmitting channels through carrier wave and channel mapping operation, and signals on the n omni-directional antenna component transmitting channels are subjected to up-conversion and radio frequency front end processing and are transmitted to satellites in an electromagnetic wave mode through the n omni-directional antenna components.
11. 11. The vehicle-mounted multi-antenna terminal communication device for low-orbit internet satellite communication is characterized by comprising a communication terminal (100) and an antenna group (200), wherein the antenna group (200) comprises N omnidirectional antenna components, and the N omnidirectional antenna components are arranged on an antenna array surface or different positions of a vehicle; The N omni-directional antenna elements each have an independent transceiving channel, and cooperate with a communication terminal (100) to implement the communication method according to any one of claims 1 to 10, so as to perform signal transceiving with a low-orbit internet satellite.
12. 12. The vehicle-mounted multi-antenna terminal communication device for low-orbit internet satellite communication according to claim 11, wherein the communication terminal (100) comprises the following units: n radio frequency front ends, each radio frequency front end is connected with one omnidirectional antenna component and is used for realizing the receiving and transmitting isolation of the omnidirectional antenna component and realizing the frequency conversion, amplification and filtering of signals between a baseband and radio frequency; The carrier and channel demapping unit (1) is respectively connected with the N radio frequency front ends and the 1 digital baseband processing unit (3) and is used for realizing the carrier and channel demapping operation in claim 10, separating m paths of received signals from the currently available receiving channels of the N omni-directional antenna components, transmitting the signals to the digital baseband processing unit (3), and simultaneously filtering out-of-band interference of signals of the receiving channels of the rest N-N omni-directional antenna components and transmitting the signals to the digital baseband processing unit (3); The carrier and channel mapping unit (2) is respectively connected with the N radio frequency front ends and the 1 digital baseband processing unit (3) and is used for realizing the carrier and channel mapping operation in claim 10, mapping m paths of transmission signals from the digital baseband processing unit (3) to the N omni-directional antenna component transmission channels and respectively transmitting the m paths of transmission signals to the radio frequency front ends corresponding to the N transmission channels; the digital baseband processing unit (3) is used for realizing baseband receiving processing of m paths of received signals for parallel demodulation and decoding and baseband transmitting processing of m paths of information for parallel encoding and modulation, and simultaneously realizing the function of timing measurement of the received signal intensity of N antenna components; The data parallel-serial conversion unit (4) is used for converting the m paths of information processed in parallel by the digital baseband processing unit (3) into one path of information and reporting the information to a high-level of the vehicle-mounted terminal; And the 1 data serial-parallel conversion unit (5) is used for converting one path of information from a high layer of the vehicle-mounted terminal into m paths of parallel information and transmitting the m paths of parallel information to the digital baseband processing unit (3) for parallel processing.
13. 13. The vehicle-mounted multi-antenna terminal communication device for low-orbit internet satellite communication according to claim 12, wherein the communication terminal (100) performs the following operations: in the signal receiving process, the communication terminal (100) monitors signals received by N antenna receiving channels, after the signals are processed by respective radio frequency front ends, m carriers are separated from currently available N omni-directional antenna component receiving channels by the carrier and channel demapping unit (1), m paths of receiving signals are obtained, and the m paths of receiving signals are sent to the digital baseband processing unit (3) for parallel baseband processing; In the signal transmitting process, the carrier and channel mapping unit (2) receives m paths of transmitting information from the digital baseband processing unit (3), maps the m paths of transmitting information to n currently available omni-directional antenna component transmitting channels according to the same mapping relation as that in the carrier and channel demapping unit (1), and transmits the m paths of transmitting information to corresponding antenna components through respective radio frequency front ends.

Description

Vehicle-mounted terminal communication method and device for low-orbit internet satellite communication Technical Field The invention belongs to the technical field of satellite communication, and particularly relates to a vehicle-mounted terminal communication method and device for low-orbit internet satellite communication. Background In a low-orbit internet satellite communication system, in order to improve the communication rate, a carrier aggregation (Carrier Aggregation, CA) technology is often adopted, and a plurality of carriers are jointly scheduled to the same user for uplink and downlink communication in a plurality of time slots. Carrier aggregation communication puts demands on system resource scheduling on the one hand and on the capabilities of the communication terminals on the other hand. Only terminals equipped with higher gain antennas can meet the link budget requirements for multicarrier transceiving. In the technical scheme at the present stage, a phased array antenna is generally used by a vehicle-mounted communication terminal with the frequency of the C frequency band and below to meet the receiving and transmitting gain requirement of carrier aggregation communication. In the scheme, the terminal directs and transmits the beam of the Jie Suanchu phased array antenna to the antenna according to the position of the terminal and the received satellite ephemeris, the antenna directs the receiving and transmitting beam to the communication satellite by utilizing a beam forming technology, and simultaneously, based on the received beam directing instruction, the beam direction is adjusted in real time so as to realize beam satellite following, and the gain of the communication beam is ensured to meet the link requirement in the working period. However, phased array antennas are huge in size and high in cost, and the beam tracking can be realized only by a complex beam control algorithm and ephemeris resolving algorithm, so that the application of the phased array antennas in vehicle satellite communication is limited. Therefore, a vehicle-mounted satellite communication method and device with high flexibility, low cost and low complexity are required to be designed, so that the application scene of vehicle-mounted satellite communication is expanded, and the vehicle-mounted satellite communication cost is reduced. Disclosure of Invention Aiming at the problems, the invention provides a vehicle-mounted terminal communication method and device for low-orbit internet satellite communication. The invention provides N omnidirectional antenna components and independent radio frequency channels for the vehicle-mounted communication terminal, so as to realize high flexibility, low cost and low complexity deployment of the vehicle-mounted communication terminal, meet the requirement of carrier aggregation communication and improve uplink and downlink transmission capacity. The invention adopts the technical scheme that: a vehicle-mounted multi-antenna terminal communication method facing low-orbit internet satellite communication comprises the following steps: Step 1, powering on a vehicle-mounted terminal provided with N omnidirectional antenna components, searching low-orbit internet satellite broadcasting signals, and measuring the received signal intensity of each antenna receiving channel to obtain a first ordering sequence, wherein N is more than or equal to 2, and N is a positive integer; Step 2, the vehicle-mounted terminal determines a first antenna unit according to the first sequencing sequence, completes a communication access flow by using the first antenna unit, and reports first information to a system side; Step 3, the system side decides whether to communicate in a carrier aggregation mode according to the received first information, and issues second information to the vehicle-mounted terminal; and 4, the vehicle-mounted terminal determines to communicate in the first working mode or the second working mode according to the received second information. Further, the first ordering sequence in step 1 is a sequence formed by arranging all antennas in descending order according to the received signal strength of the first beam, where the first beam is a beam corresponding to a broadcast signal with the highest strength among all broadcast signals measured from all antennas in a broadcast search time window. Further, in the step 2, the first antenna unit is an omni-directional antenna component corresponding to a first bit in a first ordering sequence, the first information includes a terminal capability identifier, the terminal capability identifier is used for indicating the maximum carrier aggregation number Mmax supported by the vehicle-mounted terminal, mmax is greater than or equal to 1, and Mmax is a positive integer. Further, in step 3, the second information includes a multicarrier communication identifier issued by the system side terminal. Further, the first operation mod