CN113852411A - Method for realizing group calling service based on dedicated circuit domain channel - Google Patents
Method for realizing group calling service based on dedicated circuit domain channel Download PDFInfo
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- CN113852411A CN113852411A CN202111133758.9A CN202111133758A CN113852411A CN 113852411 A CN113852411 A CN 113852411A CN 202111133758 A CN202111133758 A CN 202111133758A CN 113852411 A CN113852411 A CN 113852411A
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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, relating to the technology of wireless resource management, service management and user management in the field of satellite mobile communication. It describes the network element function design, group calling service establishment and the flow of various signaling and data in the resource allocation process of the system in detail. The satellite-borne base station dynamically schedules the resources of the group calling users in the satellite user link according to the control of the group calling server, realizes multiplexing of a plurality of terminal services in a single circuit domain channel, and solves the problem of high resource occupancy rate of the traditional group calling domain in the satellite system. The invention can be applied to the scene of a satellite mobile communication system with short spectrum resources and limited satellite load power, can effectively combine the broadcasting characteristics of a satellite channel to realize the circuit domain group calling 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, relating to the technology of wireless resource management, service management and user management in the field of satellite mobile communication.
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 terrestrial 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 a corresponding procedure capable of broadcasting services 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, due to the limitations of satellite load design such as power, volume and spectrum resources, the system design needs to ensure the basic communication requirements of users by using minimum resources, and a proprietary circuit domain channel with low power consumption, low speed and low spectrum occupancy rate still has wide application. Meanwhile, the satellite communication system has a broadcasting characteristic, and the realization of the group calling service based on the circuit domain channel has a wide practical scene.
Disclosure of Invention
The invention provides a method for realizing group call service based on a dedicated circuit domain channel, which provides the group call service for a satellite terminal of a group call group through the call control and resource scheduling of network elements such as a group call server, a satellite-borne base station and the like, realizes the uplink and downlink multiplexing of a plurality of terminal services in a single circuit domain channel, and solves the problem of high occupancy rate of group call resources realized by the traditional packet domain in a satellite system with limited spectrum resources and satellite load power.
The technical scheme adopted by the invention is as follows:
a method for realizing group call service based on dedicated circuit domain channel is realized based on a satellite mobile communication system composed of a satellite terminal, a satellite-borne base station and a group call server, wherein the satellite terminal stores the group call information of self attribution; the method comprises the following steps:
a method for realizing group call service based on dedicated circuit domain channel is realized based on a satellite mobile communication system composed of a satellite terminal, a satellite-borne base station and a group call server, wherein the satellite terminal stores the group call information of self attribution; the method comprises the following steps:
(1) after completing network attachment, the satellite terminals register to a group call server, and the group call server informs a satellite-borne base station of group call information of the terminals participating in the group call service, and the satellite-borne base station pages all the satellite terminals in a group;
(2) after receiving the paging, the satellite terminal applies for access to a satellite-borne base station in an idle state, and initiates a group calling service request, and the satellite-borne base station identifies a special circuit domain channel for allocating group calling after the group calling service;
(3) the satellite-borne base station sends a wireless connection control reconfiguration message to the satellite terminal in an access permission channel, wherein the message comprises the information of the distributed special circuit domain channel, the satellite terminal configures the context resources of each protocol layer of the group call according to the special circuit domain channel distributed in the message, replies a wireless connection control reconfiguration completion message to the satellite-borne base station, and enters a voice phase after receiving the confirmation of the satellite-borne base station;
(4) all the satellite terminals in the group call use a dedicated circuit domain channel resource to transmit voice, the satellite-borne base station establishes a management context for the group call service, arbitrates the speaking right of the satellite terminal of each uplink time slot and each downlink time slot, and schedules the transmission and the reception of data in real time.
Further, the satellite-borne base station in step (4) establishes a management context for the group call service, and arbitrates speaking right of the satellite terminal in each uplink and downlink time slot, specifically including the following steps:
(401) the satellite-borne base station sends a link management message instruction to the satellite terminal in the group call according to the use condition of the circuit domain channel;
(402) if the satellite terminal needs to send uplink data, whether a downlink has a link management message indication is detected, if yes, a link management message request is sent to the satellite-borne base station in an uplink physical channel according to a certain anti-collision rule, and if not, a voice listening state is entered;
(403) after receiving the link management message request, the satellite-borne base station determines a speaker by adopting a first-come-first-serve mode, allows the uplink resource request of the speaker, transmits a link management message in a downlink, indicates that the speaker agrees to a speaking application, and authorizes the speaker to use an uplink of a group calling channel; wherein, the link management message carries the identifier of the authorized speaker satellite terminal;
(404) other satellite terminals stop speaking and applying after receiving the link management message, and enter a voice listening state;
(405) after finishing speaking, a speaker sends a link management message to the satellite-borne base station to indicate that the conversation is finished;
(406) and after the satellite-borne base station receives the link management message of the speaker or the resource occupation timer is overtime, the downlink sends the link management message to inform all the satellite terminals that the uplink is available.
Furthermore, the satellite terminal participating in the group call in the voice phase and the satellite-borne base station mutually transmit the link management message in an unacknowledged data transmission mode.
Compared with the prior art, the invention has the following advantages:
1. compared with the traditional group calling realized by the packet domain, the invention realizes the physical channel of the group calling service based on the special circuit domain channel without special design and realizes the group calling service with other voice special channels in a unified way. The characteristics of the group calling service are realized based on the software function of the protocol stack, the uniformity of the system architecture is kept, and the design and the realization are simplified.
2. The invention realizes the dynamic allocation, scheduling and release of the physical channel of the group call service according to the group call without the need of pre-reservation, thereby saving the satellite wireless spectrum resource. A pair of DTCH8 circuit domain channels multiplexes a plurality of terminal services up and down, thereby improving the utilization rate of space wireless resources and enlarging 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 the satellite mobile communication 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 calling server realizes the management of the group calling user and the control in calling and talking.
Fig. 2 is a flow chart of the satellite mobile communication group call service of the present invention, which comprises the following steps:
(1) the group calling server initiates a group calling service, joins the group calling satellite terminal into a group on a software interface, and initiates the group calling service. The group calling server sends the user group number added to the group calling to the satellite-borne base station, and the satellite-borne base station pages the satellite terminal in the PCH and informs the satellite terminal of the group calling service;
(2) the satellite terminal applies for access from RACH in idle state, RRCConnectionRequest requests group calling service, the satellite-borne base station identifies physical layer channel DTCH8 which applies for group calling in RRM after group calling service, one group calling group uses an uplink channel and a downlink channel paired group calling channel to carry out group calling communication, the speaking party occupies the uplink channel, the listening party listens to the downlink channel, and channel resources of the system are saved;
(3) the satellite-borne base station sends RRCConnectionSetup on AGCH, establishes group call management context, group call group ID index and configures each layer resource of group call according to distributed DTCH 8; the satellite terminal configures a DTCH8 channel according to RRCConnectionSetup, replies RRCConnectionSetupCompute in the uplink, the RRC message is transmitted in an UM mode, all RRC messages of the group call service adopt a non-confirmation mode, and the satellite terminal enters a voice phase;
(4) after receiving the RRCConnectionSetupCompute of the satellite terminal, the satellite-borne base station informs the group call controller that the satellite terminal successfully accesses the network, and the interface of the group call controller displays the state of the terminal;
(5) the speaking right control message used when the satellite terminal participating in the group calling in the voice stage applies for the speaking right is transmitted to the network by using the unconfirmed data transmission mode, and the speaking authorization message of the network is also transmitted by using the unconfirmed data transmission mode.
(6) The satellite terminal needs to send voice, and a user instructs a physical layer to detect whether a DACCH8 downlink has UPLINK _ FREE according to PTT and group calling APP;
(7) after receiving an 'UPLINK _ FREE' message on a downlink channel, a group calling satellite terminal needing speaking sends an 'UPLINK _ ACCESS' message on a group calling UPLINK channel by adopting a mode of combining direct preemption and random ACCESS, wherein the message is provided with a terminal identifier, encapsulated on NT8 and directly preempts a first frame, the subsequent random time is selected as T, the maximum frame number of rollback is F, T is 60ms and F, and the downlink UPLINK _ FREE is detected by the satellite terminal in each UPLINK preemption;
(8) after receiving the UPLINK _ ACCESS, the satellite-borne base station determines the speaking of a speaker by adopting a first-come-first-serve mode instead of a queuing mode, and after determining the speaker, the satellite-borne base station sends UPLINK _ GRANT in a downlink mode and is provided with a corresponding satellite terminal identifier, updates the group calling context state and reports the satellite terminal state to a group calling server interface for display; when a group calling user becomes a speaker, the group calling user needs to inform the network when the group calling user wants to stop speaking and becomes a listener, and the network can detect that the speaker stops speaking according to time-out or other mechanisms;
(9) the satellite terminal detects that UPLINK _ GRANT of the downlink DACCH is self, informs APP of successful channel occupation, and PTT displays user speech; the terminal PTT which is not successfully seized displays that the channel allocation fails, and the user does not have the speaking right;
(10) a speaking party sends DTCH8 voice in an uplink mode, a satellite-borne base station receives the voice and then sends the voice in a downlink mode, and other group calling users receive the voice;
(11) a user of a speaker RELEASEs PTT, UPLINK _ Release is sent in an UPLINK mode, a satellite-borne base station sends UPLINK _ FREE in a downlink mode, the group calling context state is updated, and the state of a satellite terminal is reported to be displayed on a group calling controller interface;
(12) the satellite-borne base station has the right of forcibly ending a certain speaker, and sends UPLINK _ DISCONNECT with a speaker identifier in the downlink under the condition that a timer is overtime or based on priority consideration, and then sends UPLINK _ FREE in the downlink.
(13) The group call server informs the satellite-borne base station to end the group call service, an RRCConnectionRelease message is sent to the satellite terminal in a downlink mode, the interface of the satellite terminal displays that the call is ended, and the satellite-borne base station reports that the group call server service normally exits.
The embodiments of the invention originally create a method for realizing group calling service based on a dedicated circuit domain channel, are particularly suitable for satellite-borne satellite mobile communication systems, can effectively improve the utilization rate of space wireless resources, and expand the system capacity.
Claims (3)
1. A method for realizing group call service based on dedicated circuit domain channel is realized based on a satellite mobile communication system composed of a satellite terminal, a satellite-borne base station and a group call server, wherein the satellite terminal stores the group call information of self attribution; the method is characterized by comprising the following steps:
(1) after completing network attachment, the satellite terminals register to a group call server, and the group call server informs a satellite-borne base station of group call information of the terminals participating in the group call service, and the satellite-borne base station pages all the satellite terminals in a group;
(2) after receiving the paging, the satellite terminal applies for access to a satellite-borne base station in an idle state, and initiates a group calling service request, and the satellite-borne base station identifies a special circuit domain channel for allocating group calling after the group calling service;
(3) the satellite-borne base station sends a wireless connection control reconfiguration message to the satellite terminal in an access permission channel, wherein the message comprises the information of the distributed special circuit domain channel, the satellite terminal configures the context resources of each protocol layer of the group call according to the special circuit domain channel distributed in the message, replies a wireless connection control reconfiguration completion message to the satellite-borne base station, and enters a voice phase after receiving the confirmation of the satellite-borne base station;
(4) all the satellite terminals in the group call use a dedicated circuit domain channel resource to transmit voice, the satellite-borne base station establishes a management context for the group call service, arbitrates the speaking right of the satellite terminal of each uplink time slot and each downlink time slot, and schedules the transmission and the reception of data in real time.
2. The method according to claim 1, wherein the satellite-based base station in step (4) establishes a management context for the group call service, and arbitrates speaking right of the satellite terminal in each uplink and downlink time slot, and specifically comprises the following steps:
(401) the satellite-borne base station sends a link management message instruction to the satellite terminal in the group call according to the use condition of the circuit domain channel;
(402) if the satellite terminal needs to send uplink data, whether a downlink has a link management message indication is detected, if yes, a link management message request is sent to the satellite-borne base station in an uplink physical channel according to a certain anti-collision rule, and if not, a voice listening state is entered;
(403) after receiving the link management message request, the satellite-borne base station determines a speaker by adopting a first-come-first-serve mode, allows the uplink resource request of the speaker, transmits a link management message in a downlink, indicates that the speaker agrees to a speaking application, and authorizes the speaker to use an uplink of a group calling channel; wherein, the link management message carries the identifier of the authorized speaker satellite terminal;
(404) other satellite terminals stop speaking and applying after receiving the link management message, and enter a voice listening state;
(405) after finishing speaking, a speaker sends a link management message to the satellite-borne base station to indicate that the conversation is finished;
(406) and after the satellite-borne base station receives the link management message of the speaker or the resource occupation timer is overtime, the downlink sends the link management message to inform all the satellite terminals that the uplink is available.
3. The method of claim 2, wherein the satellite terminal participating in the group call in the voice phase and the satellite-borne base station send link management messages to each other in an unacknowledged data transmission manner.
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2021
- 2021-09-27 CN CN202111133758.9A patent/CN113852411B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101027856A (en) * | 2004-08-17 | 2007-08-29 | 三星电子株式会社 | Apparatus and method for providing poc service in wireless communication system supporting bcast service |
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