CN115001570B - Emergency communication method based on multi-beam satellite mobile communication system - Google Patents
Emergency communication method based on multi-beam satellite mobile communication system Download PDFInfo
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Abstract
The invention discloses an emergency communication method based on a multi-beam satellite mobile communication system, which comprises the following steps: dividing the frequency resources and the beam resources of the satellite based on a multi-color frequency reuse criterion: forming a multi-color multiplexing relation between the whole satellite frequency resource and the beam resource, wherein the terminal users in the beams share the emergency service communication frequency resource, and the terminal users between the beams use the emergency service communication frequency resource in a multi-color frequency multiplexing mode; allocating emergency service communication frequency resources by adopting a resource pre-allocation strategy: the operation control management center generates a resource allocation table, and the gateway station emergency station control center performs specific allocation on communication frequency resources; the terminal user sends short message request in R-ALOHA random access mode, and the gateway station sends response receipt in VTDM burst mode. The invention can carry out the emergency service communication service without carrying out a complex signaling message interaction flow for the terminal user, and efficiently report the position information of the user terminal in real time in a short message mode.
Description
Technical Field
The invention belongs to the technical field of multi-beam satellite mobile communication, and particularly relates to an emergency communication system and method based on a multi-beam satellite.
Background
A satellite mobile communication system is generally composed of three parts, a space section, a ground section and a user section, as shown in fig. 1. The space section consists of a static orbit satellite, realizes the transparent forwarding function of information and adopts multi-point wave beams to cover a user area; the ground section consists of an operation control management center and a gateway station and mainly completes the functions of satellite management, service processing, network management and the like; the user segment is composed of various station type terminals.
The satellite mobile communication system mainly provides conventional mobile service services including voice, fax, short message, data, video, and the like. The conventional service transfer mode via the satellite link includes two types of single-hop transfer and double-hop transfer: the single-hop transfer mode mainly completes communication service between the terminal user and the gateway station, and a transfer link comprises a transmission path between a satellite and the gateway station and a transmission path between the satellite and the terminal user; the double-hop transfer mode mainly completes communication service between terminal users, the communication service at this time needs to exchange and forward messages at a gateway station, and the transfer path comprises two transmission paths between a satellite and the gateway station and two transmission paths between the satellite and the terminal users. In order to guarantee the QoS (quality of service) of the conventional service communication service, a terminal user needs to perform signaling message interaction procedures such as an access request, a network access application, resource allocation and the like before initiating the conventional service, and the signaling messages are realized between the user terminal and a gateway station in a single-hop transmission mode. The general processing flow of the conventional service is shown in fig. 2, and the whole signaling message interaction flow includes a multi-time single-hop transfer process; a signaling message processing delay of about several seconds before performing a conventional service is calculated as a one-hop transmission delay of about 560 ms. The time delay can be tolerated for the service insensitive to the conventional service time delay; however, for the emergency communication service sensitive to the time delay, a quick real-time response to the emergency needs to be made, and the message transmission time delay is one of the most important transmission indexes. If the emergency communication service is performed by adopting a complicated message transmission process in a conventional business service mode, adverse factors such as low efficiency and poor real-time performance of the emergency communication service are inevitably caused.
CN112865854A discloses an emergency lifesaving communication method based on multi-beam communication satellite, which uses time sequence ALOHA and TDM communication protocols, but such communication protocols need to ensure strict time sequence synchronization between a gateway station and a terminal user, the user terminal needs to initially send ALOHA messages at a fixed time, and the gateway station needs to continuously send TDM messages at the fixed time. In addition, the patent proposes to adopt FDMA transmission system, and the beam resources adopt the emergency reservation of corresponding channel resources and the gateway station redistributes the reserved resources, but the beam frequency resource allocation strategy and the specific implementation mechanism of the emergency short message transmission are not clear.
Disclosure of Invention
The invention aims to provide an emergency communication method based on a multi-beam satellite mobile communication system, so that a terminal user can carry out emergency service communication service in a satellite coverage area without carrying out complex signaling message interaction processes such as access request, network access authentication, resource application and the like, and the position information of the user terminal is efficiently reported in real time in a short message mode.
The technical solution for realizing the purpose of the invention is as follows: an emergency communication method based on a multi-beam satellite mobile communication system, the multi-beam satellite mobile communication system including a space segment, a ground segment and a user segment, the space segment being composed of a stationary orbit satellite, the ground segment being composed of an operation and control management center and a gateway station, the user segment being composed of end users, the gateway station being provided with an emergency service system, the emergency service system including an emergency station control center, the method comprising:
(1) Dividing the frequency resources and beam resources of the satellite based on a multi-color frequency reuse criterion: forming a multi-color multiplexing relation between the whole satellite frequency resource and the beam resource, wherein the terminal users in the beams share the emergency service communication frequency resource, and the terminal users between the beams use the emergency service communication frequency resource in a multi-color frequency multiplexing mode;
(2) Allocating emergency service communication frequency resources by adopting a resource pre-allocation strategy: the operation control management center generates a resource allocation table, and the gateway station emergency station control center specifically allocates communication frequency resources;
(3) The emergency service adopts an R-ALOHA/VTDM mode to carry out service transmission: the terminal user sends the short message request of the emergency service in the R-ALOHA random access mode, and the gateway station sends the response receipt in the VTDM burst mode.
Compared with the prior art, the invention has the remarkable advantages that: the real-time performance is stronger: the system directly adopts an R-ALOHA/VTDM burst mode to transmit messages; on one hand, the emergency short message service can be carried out without a complex signaling interaction flow; on the other hand, the terminal user sends an emergency service request in an R-ALOHA random access mode, the gateway station sends an emergency service request response in a VTDM burst mode, and the gateway station and the terminal user can complete emergency communication without strict time slot synchronization; (2) Satellite beam frequency resources are divided by using a multicolor multiplexing mechanism, so that the frequency resource utilization rate of a terminal user is improved; (3) The terminal users in the wave beams adopt a communication frequency sharing mode, and the wave beams adopt a multicolor frequency multiplexing mode by utilizing a multicolor relation, so that the receiving and transmitting processing efficiency of the emergency communication system of the gateway station is improved.
Drawings
Fig. 1 is a diagram of a satellite mobile communication system architecture.
Fig. 2 is a flowchart of a conventional service interaction of a satellite mobile communication system.
Figure 3 is a schematic diagram of spot beam and 7 color cell coverage.
Fig. 4 is a diagram illustrating multi-beam and frequency resource mapping in a satellite mobile communication system.
Fig. 5 is a flow chart of emergency service transmission of the satellite mobile communication system.
Fig. 6 is a flow chart of an emergency short message transmission implementation of the satellite mobile communication system.
Detailed Description
The invention discloses an efficient real-time emergency communication strategy and an implementation mechanism in a multi-beam satellite mobile communication system. Aiming at the emergency communication service of the satellite mobile communication system sensitive to time delay, the satellite system adopts a multi-color beam frequency resource pre-allocation strategy, and a simple and efficient burst transmission mechanism is adopted between a terminal user and a gateway station, so that the terminal user can carry out the emergency service communication service in the satellite coverage area without carrying out complex signaling message interaction processes such as access request, network access authentication, resource application and the like, and can report the position information of the user terminal in a short message mode in real time and efficiently.
The invention relates to an emergency communication method based on a multi-beam satellite mobile communication system, which comprises a space section, a ground section and a user section, wherein the space section consists of a static orbit satellite, the ground section consists of an operation control management center and a gateway station, and the user section consists of terminal users, and is characterized in that the gateway station is provided with an emergency service system which comprises an emergency station control center, and the method specifically comprises the following steps:
(1) Dividing the frequency resources and beam resources of the satellite based on a multi-color frequency reuse criterion: forming a multi-color multiplexing relation between the whole satellite frequency resource and the beam resource, wherein the terminal users in the beams share the emergency service communication frequency resource, and the terminal users between the beams use the emergency service communication frequency resource in a multi-color frequency multiplexing mode;
(2) Allocating emergency service communication frequency resources by adopting a resource pre-allocation strategy: the operation control management center generates a resource allocation table, and the gateway station emergency station control center performs specific allocation on communication frequency resources;
(3) The emergency service adopts an R-ALOHA/VTDM mode to carry out service transmission: the terminal user sends the short message request of the emergency service in the R-ALOHA random access mode, and the gateway station sends the response receipt in the VTDM burst mode.
As a specific example, the emergency service system of the gateway station further includes an emergency channel device, a user management service unit, a short message gateway, and an emergency station control front-end service interface; the emergency station control center comprises a channel equipment management unit, a channel equipment data unit, a short message storage unit and a terminal information storage unit;
the emergency service system realizes the operations of short message content extraction, user identity identification, short message storage and response processing; and the emergency station control front-end service interface is used for monitoring emergency communication and displaying situation.
As a specific example, the dividing the frequency resources and the beam resources of the satellite based on the multi-color frequency reuse criterion is as follows:
the whole multi-beam satellite mobile communication system adopts a multi-color frequency reuse rule, a satellite service area covers in a multi-color cell mode, all spot beams of a satellite are distributed to different cells, and the cells in the satellite coverage area are distinguished by beam and frequency combinations; all terminal users in the same wave beam belong to the same cell and share the emergency service communication frequency resource, and the terminal users between different wave beams adopt a frequency division multiplexing mode to carry out emergency service communication.
As a specific example, the resource pre-allocation policy is adopted to allocate emergency service communication frequency resources, which is specifically as follows:
an operation control management center of the multi-beam satellite mobile communication system selects a frequency sub-band in the frequency resource corresponding to each spot beam as a communication frequency resource of emergency service according to the spot beam frequency resource condition in the system; and the gateway station emergency station control center configures emergency channel equipment frequency resource parameters in corresponding wave beams according to the emergency service communication frequency resources issued by the operation and control management center, and completes the emergency service communication frequency resource pre-planning configuration.
As a specific example, the emergency service uses an R-ALOHA/VTDM method to perform service transmission, which is specifically as follows:
the terminal users send emergency short message requests in an R-ALOHA random access mode, the terminal users in the wave beams carry out emergency service in a random competition mode, and the terminal users between the wave beams carry out emergency service in a multi-color frequency division multiplexing mode;
the gateway station adopts a full-band all-spot-beam parallel processing transceiving mode, and each terminal user spot beam corresponds to one corresponding emergency service transceiving processing channel; after receiving the emergency service request of the terminal user, the emergency service system at the gateway station side sends a response receipt message in a single carrier VTDM burst mode in a corresponding beam channel.
As a specific example, the emergency service communication service of the satellite mobile communication system carries the location information of the terminal user in the form of short messages, including longitude, latitude and altitude data; the terminal user acquires the current position information in real time, and directly sends an emergency service request in real time in an R-ALOHA random access mode when emergency service communication is needed.
As a specific example, the short message transmission process of the emergency service is as follows:
(1) a terminal user acquires current position information in real time according to the Beidou module or the GPS module, wherein the current position information comprises longitude, latitude and altitude data;
(2) the terminal user adopts an R-ALOHA random access mode to send the current position information in a short message form;
(3) a receiving channel of the gateway station emergency service system receives emergency burst short messages in real time, and forwards short message data to an emergency station control front-end service interface after detecting the indication of the emergency service short messages;
(4) the emergency station control center sends an emergency communication request indication according to the emergency short message reported by the emergency channel equipment; meanwhile, sending an emergency short message response receipt in a VTDM burst mode in a corresponding beam emergency channel;
(5) and the terminal user receives the emergency short message receipt and the emergency service is finished.
As a specific example, the emergency service communication strategy implementation of the multi-beam satellite mobile communication system includes a resource pre-planning phase and an emergency short message service transmission phase, wherein:
1. resource preplanning phase
Supposing that the number of the system multi-beam is M point beams, a frequency multiplexing mechanism adopts an N-color multiplexing mode, and the point beams of the whole system are divided into [ M/N ] beam groups according to a mapping rule, wherein [ ] represents that the whole is taken; each group of spot beams are mapped to the same N-color frequency segments, N beams in one group respectively correspond to N different frequency segments in the N colors, and each frequency segment in the N colors comprises a plurality of communication frequency sub-bands;
the emergency service adopts a frequency division multiplexing mode, and the emergency service communication resource pre-planning is to select a communication sub-band in each wave beam as an emergency service communication frequency resource; the gateway station side frequency resources are occupied by M spot beams, and the user side frequency resources after N-color mapping are a group of N-color frequency segments; the gateway station side adopts M point beam full-band transceiving processing corresponding to M emergency transceiving channels; a terminal user selects one emergency service communication frequency sub-band in the N-color frequency band to perform transceiving processing according to the current wave beam;
2. short message transmission phase
The system emergency service carries out service transmission in the form of short messages and bears the position information of the user.
As a specific example, for the satellite spot beam number M =110 and the multi-color multiplexing mode, a 7-color multiplexing mechanism N =7 is adopted, and the emergency service resource specific configuration process is as follows:
(1) the operation control management center generates a resource allocation table;
the ground segment operation and control management center divides 110 point beams into 16 7 color groups according to the 7 color multiplexing relation according to the satellite beam frequency resources, so thati=1,2, \8230;, 16 denotes the number of 7 color groups, using
Is shown asnNumber bundle mapping to
7 color groups, generating the ith 7 color group beam set
(ii) a Numbering the user frequency resource sub-bands corresponding to the 7-color frequencies from 1 toMSet of end user frequency resourcesF={f 1 ,f 2 ,...,f M Equally spaced into successive 7 portions; each part selects a sub-band as emergency communication resource under the beam, and the numbers of the selected sub-bands are respectively recorded asm 1 Tom 7 Of 1 atiEmergency frequency resource corresponding to 7 color groups
(ii) a Whole emergency service resource table generated by operation control management centerBF={{B 1 ;F 1 },{B 2 ;F 2 },…, {B 16 ;F 16 }}；
(2) Configuring parameters of a gateway station control system;
the gateway station emergency station control center divides 110 emergency transceiving channels into 16 groups according to 7-color multiplexing relation, and 7 channels in each group correspond to 7 beams in 7 colors respectively; according to a resource parameter configuration table issued by an operation control management center
Extracting to obtain
And the number of the wave beam in each 7-color group and the number of the emergency service resource sub-band in the wave beam configure the transceiving frequency resource parameters in the corresponding channel equipment.
As a specific example, the detailed transmission flow of the short message of the emergency service system in the gateway station is as follows:
(1) a gateway station emergency channel device detects an emergency short message request sent by a terminal user in a satellite coverage area;
(2) the emergency station control center establishes UDP communication with the emergency channel equipment, receives emergency short messages of the emergency channel equipment and puts the emergency short messages into a message queue;
(3) the channel equipment management unit acquires the IP (Internet protocol) of the channel equipment, the port number and the short message and sends the IP, the port number and the short message to the channel equipment data unit;
(4) the channel equipment data unit analyzes the short message to obtain the short message contents of terminal user IMSI number, terminal user telephone number, longitude, latitude, altitude and alarm time, and sends the short message contents to the short message storage unit, and at the same time, the terminal user IMSI number is used for carrying out user authority identification to the user management service unit, and the user management service unit returns an authentication result;
(5) judging according to the short message content stored in the short message storage unit, if the terminal user has emergency authority, storing terminal information to the terminal information storage unit, wherein the terminal information comprises an IMSI number of the terminal user, a telephone number of the terminal user, the terminal authority, a channel equipment IP, a channel equipment port and a satellite beam number;
(6) calling a short message module, and sending short message contents to a short message gateway, wherein the short message contents comprise: a terminal user telephone number, a terminal user IMSI number, a beam number, a longitude, a latitude, an altitude and an alarm time;
(7) the short message gateway forwards the emergency short message to an emergency station control front-end service interface and sends an emergency service request to an attendant; the short message gateway sends an emergency short message response message to the short message storage unit;
(8) the short message storage unit analyzes the terminal user IMSI number in the emergency short message response message, finds the terminal user detailed information in the terminal user information class according to the terminal user IMSI number, wherein the terminal user detailed information comprises the terminal user IMSI number, the terminal telephone number, the terminal authority, the channel equipment IP, the channel equipment port and the satellite wave beam, and calls the channel equipment management unit to send the emergency short message response message to the corresponding emergency channel equipment.
The invention is described in further detail below with reference to the figures and the embodiments.
Examples
In this embodiment, the satellite mobile communication system is a multi-spot beam communication system, because the frequency resources of the end users are limited, the whole satellite system adopts a multi-color frequency reuse criterion to improve the frequency resource utilization rate, and the satellite service area is covered in a multi-color cell manner, as shown in fig. 3, a multi-beam 7-color frequency coverage schematic diagram is provided. All spot beams of the satellite system are distributed to different cells, and the cells in the coverage area of the satellite are distinguished by beam and frequency combination; all users in the same wave beam belong to the same cell and share the emergency service communication frequency resource, and the users in different wave beams adopt a frequency division multiplexing mode to carry out emergency service communication.
The satellite mobile communication system adopts a resource pre-allocation strategy to allocate emergency service communication frequency resources. The operation and control management center of the satellite system selects a frequency sub-band in the frequency resource corresponding to each spot beam as the communication resource of the emergency service according to the spot beam frequency resource condition in the system, and fig. 4 shows a mapping relation diagram of the spot beam frequency resource of the system. And the gateway station emergency station control center configures emergency channel equipment frequency resource parameters in corresponding beams according to the emergency service communication frequency resources issued by the operation and control management center, and completes the emergency service frequency resource pre-planning configuration. The emergency services resource preplanning configuration process may be described as:
1) The operation and control management center divides the corresponding relation between the beams and the communication frequency resources in the system according to the multi-color frequency multiplexing criterion according to the task instruction, and selects an available frequency sub-band in each beam as the communication frequency resource of the corresponding beam emergency service;
2) The gateway station side station control center configures corresponding emergency channel frequency resource parameters according to a configuration parameter table issued by the operation control management center;
3) The gateway station emergency service system is in a waiting service state.
The emergency service of the satellite mobile communication system adopts the R-ALOHA/VTDM mode to carry out service transmission. The emergency service users directly send emergency services in an R-ALOHA random access mode, the users in the wave beams carry out emergency services in a random competition mode, and the users in the wave beams carry out emergency services in a multi-color frequency division multiplexing mode. The gateway station adopts a full-band all-spot-beam parallel processing transceiving mode, and each user spot beam corresponds to one corresponding emergency service transceiving processing channel; after receiving the user emergency service request, the emergency system at the gateway station side sends a response acknowledgement message in a single carrier VTDM (vertical time division multiplexing) burst mode in a corresponding beam channel.
The emergency communication service of the satellite mobile communication system carries the position information of the user in the form of short messages, wherein the position information comprises longitude, latitude and altitude data. The terminal user can quickly acquire the current position information in real time according to the Beidou module (or the GPS module), and directly sends an emergency service request in real time in an R-ALOHA random access mode when emergency service communication is needed.
The emergency services short message service transmission process is shown in fig. 5 and can be described as follows:
1) A terminal user acquires current position information in real time according to the Beidou module (or the GPS module), wherein the current position information comprises longitude, latitude and altitude data;
2) The terminal user adopts an R-ALOHA random access mode to send the current position information in a short message form;
3) The gateway station side emergency service system receiving channel receives emergency burst short messages in real time, and forwards short message data to a station control center front-end interface after detecting the indication of the emergency service short messages;
4) The gateway station control center sends out an emergency communication request indication according to the emergency short message reported by the emergency channel equipment; meanwhile, sending an emergency short message response receipt in a VTDM burst mode in a corresponding beam emergency channel;
5) And the terminal user receives the emergency short message receipt and the emergency service is finished.
The implementation of the emergency service communication strategy of the satellite mobile communication system in the embodiment includes a resource preplanning stage and an emergency short message service transmission stage, which specifically includes the following steps:
1. resource preplanning phase
The satellite mobile communication system is a multi-beam system, the number of multi-beams of the system is assumed to be M point beams, and a frequency multiplexing mechanism adopts an N-color multiplexing mode. According to the mapping rule shown in fig. 4, the spot beams of the entire satellite system can be divided into [ M/N ] beam groups, [ ] indicating that the whole is taken; each group of spot beams are mapped to the same N-color frequency segments, N beams in one group respectively correspond to N different frequency segments in N colors, and each frequency segment in the N colors comprises a plurality of communication frequency sub-bands. According to the content of the invention, the emergency service adopts a frequency division multiplexing mode, and the emergency service communication resource preplanning essentially selects one communication sub-band in each wave beam as the emergency service communication frequency resource. And the gateway station side frequency resources are occupied by M spot beams, and the user side frequency resources after N-color mapping are a group of N-color frequency segments. The gateway station side adopts M point beam full-band transceiving processing corresponding to M emergency transceiving channels; the user terminal only needs to select one emergency service communication frequency sub-band in the N-color frequency band to perform transceiving processing according to the current wave beam. Taking the satellite spot beam number M =110 and the multi-color multiplexing mode adopting the 7-color multiplexing mechanism N =7 as an example, the emergency service resource specific configuration process is as follows:
(1) operation control management center generates resource allocation table
The ground segment operation and control management center divides 110 point beams into 16 7 color groups according to the 7 color multiplexing relation according to the satellite beam frequency resources, so thati=1,2, \8230;, 16 denotes the number of 7 color groups, using
Is shown asnNumber beam is mapped to
7 color groups, generating the ith 7 color group beam set
(ii) a Numbering the user frequency resource sub-bands corresponding to the 7-color frequencies from 1 toMSet of end user frequency resourcesF={f 1 ,f 2 ,...,f M Equal intervals are divided into 7 continuous parts; selecting one sub-band as emergency communication resource under the beam, and recording the number of the selected sub-band asm 1 Tom 7 Of 1 atiEmergency frequency resource corresponding to 7 color groups
(ii) a Whole emergency service resource table generated by operation control management centerBF={{B 1 ;F 1 },{B 2 ;F 2 },…, {B 16 ;F 16 }}；
(2) Configuration parameters of station control system of gateway station
The station control micro-service in the satellite system gateway station divides 110 emergency transceiving channels into 16 groups according to 7-color multiplexing relation, and 7 channels in each group correspond to 7 waves in 7 colors respectivelyAnd (4) bundling. According to the resource parameter configuration table issued by the operation control management center
Extracting to obtain the first
And the number of the wave beam in each 7-color group and the number of the emergency service resource sub-band in the wave beam configure the transceiving frequency resource parameters in the corresponding channel equipment.
2. Short message transmission phase
According to the invention, the emergency service of the satellite mobile communication system is in the form of short message for service transmission, and mainly bears the position information of the user. The detailed transmission flow of the emergency short message service in the gateway station is as shown in fig. 6, and the detailed analysis is as follows:
(1) a gateway station emergency receiving and transmitting channel device detects an emergency short message request sent by a terminal user in a satellite coverage area;
(2) the emergency station control micro-service establishes UDP (user Datagram protocol) communication with the emergency channel equipment, receives the emergency short message of the channel equipment and puts the short message into a message queue;
(3) the channel equipment management module acquires an IP (Internet protocol) and a port number of the channel equipment;
(4) the channel equipment module analyzes the short message content, including the channel equipment IP, port number, terminal IMSI, longitude, latitude, altitude, alarm time and other short message content, and identifies the user authority of the terminal IMSI (user unique identification) number to the user management service, and the user management service returns the authentication result;
(5) if the emergency station control micro-service channel equipment module judges that the user terminal has emergency permission, the terminal information module stores the terminal information: a terminal IMSI number, a terminal telephone number, a terminal authority, a channel equipment IP, a channel equipment port, a satellite beam number and the like;
(6) the emergency station control micro-service channel equipment module calls a short message module of the emergency station control micro-service and sends message contents to a system emergency short message gateway, wherein the message contents comprise: a terminal telephone number, a terminal IMSI number, a beam number, longitude, latitude, altitude and alarm time;
(7) the short message gateway forwards the emergency short message to an emergency station control center front-end service and sends an emergency service request to an operator on duty; the short message gateway sends a response to the short message storage unit;
(8) the short message storage unit analyzes the terminal IMSI number in the emergency short message response message, finds terminal detailed information in a terminal information class according to the IMSI, wherein the terminal detailed information comprises the terminal IMSI number, the terminal telephone number, the terminal authority, the channel equipment IP, a channel equipment port and a satellite beam, and calls a channel equipment management module of the emergency station control micro-service to send the emergency short message response message to corresponding channel equipment.
In summary, the first embodiment of the present invention provides an R-ALOHA/VTDM emergency communication strategy based on a multi-beam satellite system, in which an end user sends an emergency short message request in an R-ALOHA random access manner, and a gateway station sends a response receipt in a VTDM burst manner; secondly, the invention provides a frequency beam resource planning strategy based on a multi-beam satellite system, a multi-color multiplexing mechanism is utilized to divide satellite beam frequency resources, a specific multi-color multiplexing relation is formed between the whole satellite frequency resources and the beam resources, terminal users in the beams share emergency communication frequency resources, and the terminal users between the beams use the emergency communication frequency resources in a multi-color frequency multiplexing mode; thirdly, the invention provides a specific emergency short message transmission realization mechanism, wherein an operation control management center generates a resource allocation table, and a gateway station control micro-service center performs specific allocation on communication frequency resources; the emergency micro-service system in the gateway station realizes the operations of extracting the content of the emergency short message, identifying the identity of the user, storing the short message, responding and processing, and the like; and the station control front-end service is used as a monitoring and situation display center of the emergency system.
The multi-beam satellite emergency communication strategy provided by the invention has stronger real-time performance: the emergency system directly adopts an R-ALOHA/VTDM burst mode to carry out message transmission; on one hand, the emergency short message service can be carried out without a complex signaling interaction flow; on the other hand, the terminal user sends an emergency service request in an R-ALOHA random access mode, the gateway station sends an emergency service request response in a VTDM burst mode, and the gateway station and the terminal user can complete emergency communication without strict time slot synchronization; in addition, the invention utilizes the multi-color multiplexing mechanism to divide the satellite beam frequency resources, thereby improving the frequency resource utilization rate of terminal users. The terminal users in the wave beams adopt a communication frequency sharing mode, and the wave beams adopt a multicolor frequency multiplexing mode by utilizing a multicolor relation, so that the receiving and transmitting processing efficiency of the emergency communication system of the gateway station is improved.
Claims (8)
1. An emergency communication method based on a multi-beam satellite mobile communication system, the multi-beam satellite mobile communication system comprises a space section, a ground section and a user section, the space section is composed of a static orbit satellite, the ground section is composed of an operation and control management center and a gateway station, the user section is composed of end users, the gateway station is provided with an emergency service system, the emergency service system comprises an emergency station control center, and the method specifically comprises the following steps:
(1) Dividing the frequency resources and beam resources of the satellite based on a multi-color frequency reuse criterion: forming a multi-color multiplexing relation between the whole satellite frequency resource and the beam resource, wherein the terminal users in the beams share the emergency service communication frequency resource, and the terminal users between the beams use the emergency service communication frequency resource in a multi-color frequency multiplexing mode;
(2) Allocating emergency service communication frequency resources by adopting a resource pre-allocation strategy: the operation control management center generates a resource allocation table, and the gateway station emergency station control center performs specific allocation on communication frequency resources;
(3) The emergency service adopts an R-ALOHA/VTDM mode to carry out service transmission: the terminal user sends a short message request of emergency service in an R-ALOHA random access mode, and the gateway station sends a response receipt in a VTDM burst mode;
the implementation of the emergency service communication strategy of the multi-beam satellite mobile communication system comprises a resource preplanning stage and an emergency short message service transmission stage, wherein:
1. a resource pre-planning stage:
supposing that the number of the system multi-beam is M point beams, a frequency multiplexing mechanism adopts an N-color multiplexing mode, and the point beams of the whole system are divided into [ M/N ] beam groups according to a mapping rule, wherein [ ] represents that the whole is taken; each group of spot beams are mapped to the same N-color frequency segments, N beams in one group respectively correspond to N different frequency segments in N colors, and each frequency segment in the N colors comprises a plurality of communication frequency sub-bands;
the emergency service adopts a frequency division multiplexing mode, and the emergency service communication resource pre-planning is to select a communication sub-band in each wave beam as an emergency service communication frequency resource; the gateway station side frequency resources are occupied by M point beams, and the user side frequency resources after N-color mapping are a group of N-color frequency segments; the gateway station side adopts M point beam full-band transceiving processing corresponding to M emergency transceiving channels; a terminal user selects one emergency service communication frequency sub-band in the N-color frequency band to perform transceiving processing according to the current wave beam;
2. and (3) short message transmission stage:
the system emergency service transmits the service in the form of short message, and bears the position information of the user;
aiming at the satellite spot beam number M =110 and the multi-color multiplexing mode, a 7-color multiplexing mechanism N =7 is adopted, and the specific configuration process of the emergency service resources is as follows:
(1) the operation control management center generates a resource allocation table;
the ground segment operation and control management center divides 110 point beams into 16 7 color groups according to 7 color multiplexing relations according to satellite beam frequency resources, so thati=1,2, \8230;, 16 denotes the number of 7 color groups, using
Denotes the firstnThe number beam is mapped toiThe color of each group of 7 colors is divided into a plurality of groups,
represents 7 different beam numbers, yieldsiSet of 7 color group beams
；
Numbering the user frequency resource sub-bands corresponding to the 7-color frequencies from 1 toMSet of end user frequency resourcesF={f 1 ,f 2 ,...,f M Equal intervals are divided into 7 continuous parts; selecting one sub-band as emergency communication resource under the beam, and recording the number of the selected sub-band asm 1 Tom 7 Of 1 atiEmergency frequency resource corresponding to 7 color groups
；
Indicating the number of emergency communication frequency points in the corresponding wave beam
Representing 7 different communication frequency point numbers; whole emergency service resource table generated by operation control management centerBF={{B 1 ;F 1 },{B 2 ;F 2 },…, {B 16 ;F 16 }}；
(2) Configuring parameters of a gateway station control system;
the gateway station emergency station control center divides 110 emergency transceiving channels into 16 groups according to 7-color multiplexing relation, and 7 channels in each group correspond to 7 beams in 7 colors respectively; according to the resource parameter configuration table issued by the operation control management centerBFExtracting to obtainiAnd the number of the wave beam in each 7-color group and the number of the emergency service resource sub-band in the wave beam configure the parameters of the transceiving frequency resources in the corresponding channel equipment.
2. The emergency communication method based on the multi-beam satellite mobile communication system according to claim 1, wherein the emergency service system of the gateway station further comprises an emergency channel device, a subscriber management service unit, a short message gateway, an emergency station control front-end service interface; the emergency station control center comprises a channel equipment management unit, a channel equipment data unit, a short message storage unit and a terminal information storage unit;
the emergency service system realizes the operations of short message content extraction, user identity authentication, short message storage and response processing; and the emergency station control front-end service interface is used for monitoring emergency communication and displaying situation.
3. The emergency communication method based on a multi-beam satellite mobile communication system according to claim 1, characterized in that said frequency resources and beam resources of the satellite are divided based on a multi-color frequency reuse criterion, as follows:
the whole multi-beam satellite mobile communication system adopts a multi-color frequency reuse rule, a satellite service area is covered in a multi-color cell mode, all spot beams of a satellite are distributed to different cells, and the cells in the coverage area of the satellite are distinguished by beam and frequency combinations; all terminal users in the same wave beam belong to the same cell and share the emergency service communication frequency resource, and the terminal users in different wave beams carry out emergency service communication in a frequency division multiplexing mode.
4. The multi-beam satellite mobile communication system-based emergency communication method of claim 1, wherein the resource pre-allocation strategy is adopted to allocate emergency service communication frequency resources, specifically as follows:
an operation control management center of the multi-beam satellite mobile communication system selects a frequency sub-band in the frequency resource corresponding to each spot beam as a communication frequency resource of emergency service according to the spot beam frequency resource condition in the system; and the gateway station emergency station control center configures emergency channel equipment frequency resource parameters in corresponding beams according to the emergency service communication frequency resources issued by the operation and control management center, and completes the emergency service communication frequency resource pre-planning configuration.
5. The emergency communication method based on the multi-beam satellite mobile communication system according to claim 1, wherein the emergency service uses an R-ALOHA/VTDM method for traffic transmission, specifically as follows:
the terminal users send emergency short message requests in an R-ALOHA random access mode, the terminal users in the wave beams carry out emergency service in a random competition mode, and the terminal users between the wave beams carry out emergency service in a multi-color frequency division multiplexing mode;
the gateway station adopts a full-band all-spot-beam parallel processing transceiving mode, and each terminal user spot-beam corresponds to a corresponding emergency service transceiving processing channel; after receiving the emergency service request of the terminal user, the gateway station side emergency service system sends a response receipt message in a single carrier VTDM burst mode in a corresponding beam channel.
6. The multi-beam satellite mobile communication system based emergency communication method according to claim 2, wherein the satellite mobile communication system emergency services communication service carries location information of where the end user is located in the form of short message, including longitude, latitude and altitude data; and the terminal user acquires the current position information in real time, and directly sends an emergency service request in real time in an R-ALOHA random access mode when the emergency service communication is needed.
7. The multi-beam satellite mobile communication system based emergency communication method according to claim 6, wherein the short message transmission procedure of the emergency service is:
(1) a terminal user acquires current position information in real time according to the Beidou module or the GPS module, wherein the current position information comprises longitude, latitude and altitude data;
(2) the terminal user adopts an R-ALOHA random access mode to send the current position information in a short message form;
(3) a receiving channel of the gateway station emergency service system receives emergency burst short messages in real time, and forwards short message data to an emergency station control front-end service interface after detecting the indication of the emergency service short messages;
(4) the emergency station control center sends an emergency communication request indication according to the emergency short message reported by the emergency channel equipment; meanwhile, sending an emergency short message response receipt in a VTDM burst mode in a corresponding beam emergency channel;
(5) and the terminal user receives the emergency short message receipt and the emergency service is finished.
8. The emergency communication method based on the multi-beam satellite mobile communication system according to claim 7, wherein the detailed transmission procedure of the short message of the emergency service system in the gateway station is as follows:
(1) a gateway station emergency channel device detects an emergency short message request sent by a terminal user in a satellite coverage area;
(2) the emergency station control center establishes UDP communication with the emergency channel equipment, receives emergency short messages of the emergency channel equipment and puts the emergency short messages into a message queue;
(3) the channel equipment management unit acquires the IP (Internet protocol) of the channel equipment, the port number and the short message and sends the IP, the port number and the short message to the channel equipment data unit;
(4) the channel equipment data unit analyzes the short message to obtain the short message contents of terminal user IMSI number, terminal user telephone number, longitude, latitude, altitude and alarm time, and sends the short message contents to the short message storage unit, and at the same time, the terminal user IMSI number is used for carrying out user authority identification to the user management service unit, and the user management service unit returns an authentication result;
(5) judging according to the content of the short message stored in the short message storage unit, if the terminal user has emergency authority, storing terminal information to the terminal information storage unit, wherein the terminal information comprises an IMSI number of the terminal user, a telephone number of the terminal user, the terminal authority, a channel equipment IP, a channel equipment port and a satellite beam number;
(6) calling a short message module, and sending short message contents to a short message gateway, wherein the short message contents comprise: a terminal user telephone number, a terminal user IMSI number, a beam number, a longitude, a latitude, an altitude and an alarm time;
(7) the short message gateway forwards the emergency short message to an emergency station control front-end service interface and sends an emergency service request to an operator on duty; the short message gateway sends an emergency short message response message to the short message storage unit;
(8) the short message storage unit analyzes the terminal user IMSI number in the emergency short message response message, finds the terminal user detailed information in the terminal user information class according to the terminal user IMSI number, wherein the terminal user detailed information comprises the terminal user IMSI number, the terminal telephone number, the terminal authority, the channel equipment IP, the channel equipment port and the satellite wave beam, and calls the channel equipment management unit to send the emergency short message response message to the corresponding emergency channel equipment.
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