CN113852411B - Method for realizing group calling service based on special circuit domain channel - Google Patents
Method for realizing group calling service based on special circuit domain channel Download PDFInfo
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- CN113852411B CN113852411B CN202111133758.9A CN202111133758A CN113852411B CN 113852411 B CN113852411 B CN 113852411B CN 202111133758 A CN202111133758 A CN 202111133758A CN 113852411 B CN113852411 B CN 113852411B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/18523—Satellite systems for providing broadcast service to terrestrial stations, i.e. broadcast satellite service
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18513—Transmission in a satellite or space-based system
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
- H04W4/08—User group management
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/30—Resource management for broadcast services
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- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses a method for realizing group calling service based on a special circuit domain channel, which relates to the technology of radio resource management, service management and user management in the satellite mobile communication field. The method describes the network element function design of the system, the establishment of group call service and the flow of various signaling and data in the resource allocation process in detail. The satellite-borne base station dynamically schedules the resources of the group call users in the satellite user link according to the control of the group call server, so that multiplexing of a plurality of terminal services in a single circuit domain channel is realized, and the problem of high resource occupancy rate of the traditional group call function realized by a grouping domain in a satellite system is solved. The invention can be applied to the satellite mobile communication system scene with shortage of frequency spectrum resources and limited satellite load power, and can effectively combine the broadcasting characteristics of satellite channels to realize circuit domain group call service, improve the utilization rate of space wireless resources and enlarge the system capacity.
Description
Technical Field
The invention discloses a method for realizing group calling service based on a special circuit domain channel, which relates to the technology of radio resource management, service management and user management in the satellite mobile communication field.
Background
With the continuous development of communication technology, the conventional terrestrial mobile communication system has rapidly evolved into a packet service communication system capable of transmitting a large amount of data such as voice data, packet data, and circuit data. The ground 4G/5G system is specially designed to transmit multimedia service systems or multimedia broadcast communication systems. The protocol architecture designs an MBMS physical channel and corresponding procedures that enable broadcasting of traffic from one or more data sources to a plurality of UEs (user terminals) in order to support a multimedia broadcast communication system. MBMS supports multimedia applications such as real-time video and audio data, image and text data.
However, in a satellite mobile communication system, the system design needs to ensure the basic communication requirement of users by using minimum resources due to the limitation of satellite load design such as power, volume and spectrum resources, and the special circuit domain channels with low power consumption, low rate and low spectrum occupancy rate still have wide application. Meanwhile, the satellite communication system has broadcasting characteristics, and the group call service is realized based on the circuit domain channel, so that the satellite communication system has wide practical scenes.
Disclosure of Invention
The invention provides a method for realizing group calling service based on a special circuit domain channel, which provides group calling service for satellite terminals of a group calling group through calling control and resource scheduling of network elements such as a group calling server, a satellite-borne base station and the like, realizes multiplexing of a plurality of terminal services in a single circuit domain channel in an uplink and downlink manner, and solves the problem of high occupation rate of group calling resources realized by a traditional grouping domain in a satellite system with shortage of frequency spectrum resources and limited satellite load power.
The invention adopts the technical scheme that:
a method for realizing group calling service based on special circuit domain channel is realized based on satellite mobile communication system composed of satellite terminal, satellite-borne base station and group calling server, wherein the satellite terminal stores self-attributive group calling information; the method comprises the following steps:
(1) After the satellite terminals are attached to the network, registering the satellite terminals to a group calling server, and informing the satellite-borne base stations of terminal group calling information of the terminal group calling service by the group calling server, wherein the satellite-borne base stations page all the satellite terminals in the group;
(2) The satellite terminal applies access to the satellite-borne base station in an idle state after receiving the paging, initiates a group call service request, and the satellite-borne base station identifies the group call service and distributes a dedicated circuit domain channel of the group call;
(3) The satellite-borne base station sends a wireless connection control reconfiguration message to the satellite terminal in an access permission channel, the message comprises distributed special circuit domain channel information, the satellite terminal configures context resources of each protocol layer of the group call according to the special circuit domain channel distributed in the information, replies a wireless connection control reconfiguration completion message to the satellite-borne base station, and enters a voice stage after receiving confirmation of the satellite-borne base station;
(4) All satellite terminals in the group call commonly use a special circuit domain channel resource to transmit voice, and a satellite-borne base station establishes a management context for the group call service, arbitrates the speaking right of the satellite terminal of each time slot of uplink and downlink, and schedules the sending and receiving of data in real time.
Further, the satellite-borne base station in step (4) establishes a management context for the group call service, arbitrates the speaking right of the satellite terminal in each time slot of uplink and downlink, and specifically includes the following steps:
(401) The satellite-borne base station sends a link management message indication to the satellite terminals in the group call according to the use condition of the circuit domain channel;
(402) If the satellite terminal needs to send uplink data, detecting whether the downlink has a link management message indication, if so, sending a link management message request to the satellite-borne base station according to a certain anti-collision rule on an uplink physical channel, otherwise, entering a voice listening state;
(403) After receiving the request of the link management message, the satellite-borne base station determines the talker in a first-come-first-serve mode, allows the uplink resource request of the talker, and transmits the link management message in the downlink to indicate that the talker is granted to apply for talking, and authorizes the talker to use the uplink of the group call channel; the link management message carries the identification of the authorized speaker satellite terminal;
(404) After receiving the link management message, other satellite terminals stop speaking application and enter a voice listening state;
(405) After the speaker finishes speaking, a link management message is sent to the satellite-borne base station, and the end of the conversation is indicated;
(406) After receiving the link management message of the talker or the time-out of the resource occupation timer, the satellite-borne base station transmits the link management message to inform all satellite terminals that the uplink is available.
Further, the satellite terminals and the satellite-borne base stations participating in the group call in the voice stage send link management messages to each other by using a non-acknowledgement data transmission mode.
Compared with the prior art, the invention has the following advantages:
1. compared with the group call realized by the traditional grouping domain, the invention realizes the physical channel of the group call service based on the special circuit domain channel without special design and realizes the unified realization with other voice special channels. The characteristics of the group call service are realized based on the protocol stack software function, so that the uniformity of a system architecture is maintained, and the design realization is simplified.
2. The invention realizes the dynamic allocation, scheduling and release of the physical channels of the group call service according to the group call, does not need to reserve in advance, and saves satellite wireless spectrum resources. A pair of DTCH8 circuit domain channels up-down multiplexes a plurality of terminal services, improves the utilization rate of space wireless resources, and enlarges the system capacity.
Drawings
Fig. 1 is a schematic view of an application scenario of a satellite mobile communication system according to the present invention.
Fig. 2 is a flow chart of satellite mobile communications service of the present invention.
Detailed Description
The specific implementation method of the invention is described as follows:
fig. 1 is a schematic view of an application scenario of a satellite mobile communication system according to the present invention. In order to realize the invention, a satellite mobile communication system is provided, which comprises a satellite terminal, a satellite-borne base station S-eNB and a group call server. The group call server realizes the management of group call users and the control in calling and talking.
Fig. 2 is a flow chart of satellite mobile communication group call service according to the present invention, comprising the steps of:
(1) The group calling server initiates the group calling service, joins the group calling satellite terminals into a group at the software interface, and initiates the group calling service. The group calling server sends the user group number added into the group calling to the satellite-borne base station, and the satellite-borne base station pages the satellite terminal in the PCH to inform the satellite terminal of the group calling service;
(2) The satellite terminal applies for access from RACH in idle state, RRCConnection request requests group call service, satellite-borne base station identifies physical layer channel DTCH8 which is applied for group call in RRM after group call service, a group call group uses a group call channel paired by an uplink channel and a downlink channel to carry out group call communication, talker occupies the uplink channel, listener listens to the downlink channel, and channel resource of system is saved;
(3) The satellite-borne base station sends RRCConnection setup in AGCH, establishes group calling management context, group calling ID index, and configures each layer resource of group calling according to distributed DTCH 8; the satellite terminal configures a DTCH8 channel according to RRCConnection setup, replies RRCConnection setup complete in the uplink, the RRC message is transmitted in UM mode, all RRC messages of group call service are in unacknowledged mode, and the satellite terminal enters a voice stage;
(4) After receiving RRCConnection setup complete of satellite terminal, satellite-borne base station informs group call controller that satellite terminal is successful to access network, interface of group call controller displays state of terminal;
(5) The speaking right control message used when the satellite terminals participating in the group call in the voice stage apply for speaking right is sent to the network by using a non-acknowledgement data transmission mode, and the speaking authorization message of the network is also sent by using the non-acknowledgement data transmission mode.
(6) The satellite terminal needs to send voice, the user presses PTT, and the group call APP instructs the physical layer to detect whether the DACCH8 downlink has uplink_FREE;
(7) After receiving a uplink_free message on a downlink channel, a group call satellite terminal needing to speak sends the uplink_access message on the UPLINK channel by adopting a mode of combining direct occupation and random ACCESS, the message is packaged on NT8 with a terminal identifier, the first frame is directly preempted, the subsequent random time is selected as T, the maximum frame number of rollbacks is F, then T=60 ms is equal to F, and the satellite terminal needs to detect downlink uplink_free in each UPLINK preemption;
(8) After receiving the uplink_access, the satellite-borne base station determines the talker to talk in a first-come-first-serve mode rather than a queuing mode, and after determining the talker, the satellite-borne base station transmits uplink_grant with a corresponding satellite terminal identifier, updates the group call context state, and reports the satellite terminal state to a group call server interface for display; wherein, after a group call user becomes a speaker, the network needs to be informed when the group call user wants to stop speaking and become a listener, and the network can also detect that the speaker stops speaking according to a timeout or other mechanisms;
(9) The satellite terminal detects uplink_grant of the downlink DACCH as the satellite terminal, informs the APP that channel preemption is successful, and the PTT displays the speech of the user; the terminal PTT display channel allocation failure without successful preemption is that the user has no speaking right;
(10) The speaker transmits DTCH8 voice up, the satellite-borne base station receives the voice and then transmits the voice down, and other group call users receive the voice;
(11) The user of the talker RELEASEs PTT, uplink_RELEASE is sent, the satellite-borne base station downlink sends uplink_FREE, the group call context state is updated, and the satellite terminal state is reported to the group call controller interface for display;
(12) The satellite-borne base station has the right to forcefully end a certain speaker, and sends uplink_disconnect downstream under the condition that a timer is overtime or based on priority, with speaker identification, and then sends uplink_free downstream.
(13) The group call server informs the satellite-borne base station to end the group call service, and sends RRCConnection release information to the satellite terminal in a downlink mode, the interface of the satellite terminal displays the call end, and the satellite-borne base station reports the normal exit of the group call server service.
The embodiments of the present invention create a method for realizing group call service based on a dedicated circuit domain channel, and are particularly suitable for a satellite-borne satellite mobile communication system, and can effectively improve the utilization rate of space wireless resources and expand the system capacity.
Claims (3)
1. A method for realizing group calling service based on special circuit domain channel is realized based on satellite mobile communication system composed of satellite terminal, satellite-borne base station and group calling server, wherein the satellite terminal stores self-attributive group calling information; the method is characterized by comprising the following steps of:
(1) The group calling server initiates a group calling service, adds the group calling satellite terminals into a group at a software interface, initiates the group calling service, sends the group numbers of the users added into the group calling to the satellite-borne base station, and the satellite-borne base station pages the satellite terminals in the PCH to inform the satellite terminals of the group calling service;
(2) The satellite terminal applies for access from RACH in idle state, RRCConnection request requests group call service, satellite-borne base station identifies physical layer channel DTCH8 which is applied for group call in RRM after group call service, a group call group uses a group call channel paired by an uplink channel and a downlink channel to carry out group call communication, talker occupies the uplink channel, and listener listens to the downlink channel;
(3) The satellite-borne base station sends a wireless connection control reconfiguration message to the satellite terminal in an access permission channel, the message comprises distributed special circuit domain channel information, the satellite terminal configures context resources of each protocol layer of the group call according to the special circuit domain channel distributed in the information, replies a wireless connection control reconfiguration completion message to the satellite-borne base station, and enters a voice stage after receiving confirmation of the satellite-borne base station;
(4) All satellite terminals in the group call commonly use a special circuit domain channel resource to transmit voice, and a satellite-borne base station establishes a management context for the group call service, arbitrates the speaking right of the satellite terminal of each time slot of uplink and downlink, and schedules the sending and receiving of data in real time.
2. The method for implementing group call service based on dedicated circuit domain channel as claimed in claim 1, wherein said satellite-borne base station in step (4) establishes management context for group call service, arbitrates the speaking right of satellite terminal of each time slot of uplink and downlink, and specifically comprises the following steps:
(401) The satellite-borne base station sends a link management message indication to the satellite terminals in the group call according to the use condition of the circuit domain channel;
(402) If the satellite terminal needs to send uplink data, detecting whether the downlink has a link management message indication, if so, sending a link management message request to the satellite-borne base station according to a certain anti-collision rule on an uplink physical channel, otherwise, entering a voice listening state;
(403) After receiving the request of the link management message, the satellite-borne base station determines the talker in a first-come-first-serve mode, allows the uplink resource request of the talker, and transmits the link management message in the downlink to indicate that the talker is granted to apply for talking, and authorizes the talker to use the uplink of the group call channel; the link management message carries the identification of the authorized speaker satellite terminal;
(404) After receiving the link management message, other satellite terminals stop speaking application and enter a voice listening state;
(405) After the speaker finishes speaking, a link management message is sent to the satellite-borne base station, and the end of the conversation is indicated;
(406) After receiving the link management message of the talker or the time-out of the resource occupation timer, the satellite-borne base station transmits the link management message to inform all satellite terminals that the uplink is available.
3. The method for implementing group call service based on private circuit domain channel as claimed in claim 2, wherein the satellite terminals participating in the group call in the voice phase and the satellite-borne base station mutually transmit link management messages by using unacknowledged data transmission.
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| KR101058627B1 (en) * | 2004-08-17 | 2011-08-22 | 삼성전자주식회사 | Multi-party call service method and system in wireless communication system supporting broadcast service |
| CN102821358B (en) * | 2011-06-09 | 2016-03-02 | 普天信息技术有限公司 | A kind of implementation method of group-calling service |
| CN107592152A (en) * | 2016-07-06 | 2018-01-16 | 北京信威通信技术股份有限公司 | A kind of constellation satellite system, communication means and system based on constellation satellite system |
| WO2018049627A1 (en) * | 2016-09-14 | 2018-03-22 | 海能达通信股份有限公司 | Cluster group call processing method, related device, and system |
| CN109257087B (en) * | 2018-08-14 | 2021-04-06 | 南京启虹辰通信科技有限公司 | Satellite cluster real-time voice group call control method |
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