CN101616364B - Group call business realizing method - Google Patents
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- CN101616364B CN101616364B CN2009100900540A CN200910090054A CN101616364B CN 101616364 B CN101616364 B CN 101616364B CN 2009100900540 A CN2009100900540 A CN 2009100900540A CN 200910090054 A CN200910090054 A CN 200910090054A CN 101616364 B CN101616364 B CN 101616364B
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Abstract
The invention discloses a group call business realizing method which is realized on the basis of a TD-LTE broadband digital trunking communication system to carry out network register and trunking business register when each user terminal in the system starts; when group call needs to be built, comprising: a calling user terminal sends a group call request to a network side to ask for building group call; the network side builds S5/S8 load bearing for the call; the network side distributes uplink resource for the calling user terminal and builds a radio bearer and a S1 load bearing; at the same time, the network side distributes shared downlink resource to called user terminals belonging to the same district in all called user terminals corresponding to current call, and notices the called user terminals; the network side grants speech right to the calling user terminal and notices the called user terminals to finish building group call. If applied, the method of the invention can well shorten call building time delay and can progress smoothly and backwards.
Description
Technical field
The present invention relates to mobile communication technology, particularly a kind of group-calling service implementation method based on time-division Long Term Evolution (TD-LTE, Time Division-Long Term Evolution) wideband digital trunked communication system.
Background technology
Owing to possess characteristics such as distinctive scheduling, group calling and short calling, digital clustering communication system has been brought into play enormous function in the specialized communication field.Since the mid-90 in 20th century, digital clustering communication system is risen in the world, has obtained using widely, and has obtained good economic benefit and social benefit.In the existing digital cluster communication technical system, with land trunked radio (TETRA, TerrestrialTrunked Radio) and integrated digital enhanced network (iDEN, Integrated Digital EnhancedNetworks) is most widely used, in addition, also comprise based on code division multiple access (CDMA, Code DivisionMultiple Access) based on open cluster architecture (GoTa of technology, Global Open TrunkingArchitecture) with based on GT800 of global system for mobile communications (GSM, Global System for MobileCommunications) technology etc.
Group-calling service is the basic service that digital clustering communication system provides.Group-calling service allows the user to be established to the group call that belongs to a certain group of user in a certain given area, adopts semiduplex mode; In the group calling communication process, the group in any member all can become the talker, but arbitrary moment only allow a talker, other user is the hearer.Described given area is called group call region, comprises the cluster sub-district.During the call setup, system is that each sub-district in the group call region is distributed a group-calling channel respectively, and wherein up link is only used for current talker, and all hearers monitor down link; The hearer can obtain speaking right by the operation of seizing up link.Owing in group-calling service, belong to the shared down link of user in all groups in the same sub-district, seize up link, therefore can save Radio Resource greatly, improve the availability of frequency spectrum of system.
For a digital clustering communication system, call set-up time (from initiating a call to the time span that can talk) is important performance index, this time depends primarily on the complexity of user terminal and network side Signalling exchange, and propagation delay time between each network element device and network element device are to processing mode of signaling etc.Because existing group-calling service all is based on second generation mobile communication system (2G basically, 2rd Generation) or 3-G (Generation Three mobile communication system) (3G, 3rd Generation) realizes in the digital clustering communication system, as based on the GT800 system of GSM technology and based on GoTa system of CDMA technology etc., control need be unified by base station controller in the base station, can't directly communicate with core net, so cause the Signalling exchange in the group call establishment process more, increased calling establishment time delay; In addition, existing group-calling service is generally all realized in circuit domain, is difficult to the smooth evolution backward of realization system.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of group-calling service implementation method based on TD-LTE wideband digital trunked communication system, can shorten calling establishment time delay preferably, and evolution backward that can be level and smooth.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of group-calling service implementation method, this method are based on time-division Long Term Evolution TD-LTE wideband digital trunking communication system realizing, and network registry is carried out in each the user terminal start in the system, sets up default bearer, and carries out the group service registration; When needs were set up group calling, this method comprised:
Call subscriber terminal sends the group calling request message to network side, and group calling is set up in request;
Network side is this call setup S5/S8 carrying;
Network side is that call subscriber terminal distributes uplink resource, and sets up radio bearer and S1 carrying; Simultaneously, network side is called out the called user terminal that belongs to same sub-district in all corresponding called user terminals for this and is distributed the down-chain resource of sharing, and the advise called subscriber terminal;
Network side is that call subscriber terminal is authorized speaking right, and the advise called subscriber terminal, finishes call setup;
Wherein, described network side comprises for this call setup S5/S8 carrying: after enhancement mode mobile management entity eMME receives group calling request message from described call subscriber terminal, described call subscriber terminal is carried out service authentication, if authentication is not passed through, then refuse the group calling request of described call subscriber terminal, process ends; If authentication is passed through, then ask this to call out corresponding enhanced base station E-eNodeB tabulation, group priority parameters, and be this call setup S5/S8 carrying according to the parameter of asking to enhancement mode home subscriber server eHSS;
Described this call setup S5/S8 of being carrying comprises: described eMME sends the establishment bearing request message that carries described E-eNodeB tabulation to gateway S-GW; Described S-GW is this call distribution bearing resource, and distributes corresponding S-GWS5/S8-TEID at each E-eNodeB in the described E-eNodeB tabulation, sends to enhanced packet data network gateway eP-GW; Described eP-GW is this call distribution bearing resource, and is returned as the eP-GW S5/S8-TEID of this call distribution to described S-GW; Described S-GW writes down the mapping relations of described S-GW S5/S8-TEID and described eP-GW S5/S8-TEID, finishes the S5/S8 carrying and sets up, and for each E-eNodeB in the described E-eNodeB tabulation distributes corresponding S-GW S1-TEID, send to described eMME;
Described network side is that described call subscriber terminal distributes uplink resource, and sets up radio bearer and the S1 carrying comprises: it is that described call subscriber terminal distributes uplink resource that eMME indicates the E-eNodeB at described call subscriber terminal place; The E-eNodeB at described call subscriber terminal place sends RRC to described call subscriber terminal and connects reconfiguration message, wherein carries uplink resource and describes and relevant configuration information; Described call subscriber terminal is according to each layer parameter of information configuration self that receives, and returns RRC to the E-eNodeB at place and connect to reshuffle and finish message, finishes radio bearer and sets up; The E-eNodeB at described call subscriber terminal place receive described RRC connect reshuffle finish message after, be this call distribution E-eNodeBS1-TEID, and send to described eMME; Described eMME sends to S-GW with described E-eNodeB S1-TEID; Described S-GW writes down the mapping relations of described E-eNodeB S1-TEID and pre-assigned S-GW S1-TEID, and returns acknowledge message to described eMME, finishes the S1 carrying and sets up.
Adopt technical scheme of the present invention, because the TD-LTE system adopts the all-IP flattening network architecture, the base station directly links to each other with core net, and the base station is indicated according to network side and directly finished wireless resource allocation, therefore the Signalling exchange in the call establishment obviously reduces, and calling establishment time delay shortens greatly; In addition, the TD-LTE system adopts advanced air interface technologies, and the wireless transmission time delay also can reduce greatly; Have, in the scheme of the present invention, adopt parallel message process mode, network side is call subscriber terminal and called user terminal Resources allocation concurrently, sets up radio bearer and S1 carrying etc., has further shortened calling establishment time delay; At last, owing to the TD-LTE system realizes in packet domain, therefore be convenient to smoothly evolution backward.
Description of drawings
Fig. 1 is existing network architecture schematic diagram based on TD-LTE wideband digital trunked communication system.
Fig. 2 is the flow chart of group-calling service implementation method embodiment of the present invention.
Fig. 3 is network registry and a group service registration process schematic diagram among the inventive method embodiment.
Fig. 4 is the call establishment schematic diagram among the inventive method embodiment.
Embodiment
At problems of the prior art, a kind of brand-new group-calling service implementation is proposed among the present invention, this scheme is based on TD-LTE wideband digital trunking communication system realizing.Because the TD-LTE system adopts the all-IP flattening network architecture, the base station directly links to each other with core net, and the base station is indicated according to network side and directly finished wireless resource allocation, so the Signalling exchange in the call establishment obviously reduces, and calling establishment time delay shortens greatly; In addition, the TD-LTE system adopts advanced air interface technologies, as OFDM (OFDM, Orthogonal Frequency Division Multiplexing) and multiple-input and multiple-output (MIMO, Multiple-Input Multiple-Out-put) etc., the wireless transmission time delay also can reduce greatly; Have again,, therefore be convenient to smoothly evolution backward because the TD-LTE system is in the packet domain realization.
Fig. 1 is existing network architecture schematic diagram based on TD-LTE wideband digital trunked communication system.As shown in Figure 1, comprising: terminal, broadband wireless access subsystem, network subsystem and operation and maintenance sub system etc.
Wherein, terminal links to each other with broadband wireless access subsystem or network subsystem by air interface or wired connection, for the user provides various PTTs (PTT, Push-To-Talk) speech business, broadband cluster multimedia service and scheduling feature.Described terminal comprises portable terminal, fixed station and dispatching desk etc.; Further, portable terminal comprises hand-held travelling carriage and Vehicle mounted station etc., and dispatching desk comprises wireless dispatching platform and wired dispatching desk etc.
The broadband wireless access subsystem is made up of a plurality of enhancement mode eNodeB (E-eNodeB).Wireless colony scheduling feature module (RTDF among the E-eNodeB, Radio Trunking Dispatch Function) relevant treatment of group service among the responsible E-eNodeB, as, from enhancement mode mobile management entity (MME, Mobility Management Entity) (eMME) receives cluster and control signaling, be terminal called place cell allocation down link shared resource, to be sent to called user terminal etc. from the group service data flow that gateway (S-GW, Serving Gateway) receives.
Comprise eMME, S-GW, enhanced packet data network gateway (P-GW in the network subsystem, PDN Gateway) (eP-GW), enhancement mode home subscriber server (HSS, Home Subscriber Server) (eHSS) and the scheduling gateway (D-GW, Dispatch Gateway).Wherein, cluster control function module (TCF among the eMME, Trunking Control Function) is the control centre that realizes trunked call, is responsible for the authentication of cluster user and the mandate of group service, set up the carrying of transmit traffic data stream for the user of authentication success; Cluster block functions module (TPF among the eP-GW, Trunking Packet Function) be used to finish the group service data flow mapping, duplicate and distribute, and according to the business characteristic of user's request and the foundation of service quality (QoS, Quality of Service) demand initiation service bearer; Cluster user server among the eHSS (TSS, Trunking Subscriber Server) is used to store the group user profile relevant with group service with management; D-GW is the gateway of wired dispatching desk access network subsystem, is responsible for the authentication of wired dispatching desk, the signaling between wired dispatching desk and the network subsystem and the transmission of business datum; In addition, D-GW also is responsible for realizing interconnecting of this group system and other group system.
Operation and maintenance sub system comprises two kinds of equipment, and is a kind of for operator's use, is used for the maintenance and management of network system equipment, as systematic function configuration and device status monitoring etc.; Another kind is a user management device, and intrasystem user data management function is provided; Can carry out the operations such as change of the opening an account of user, cancellation and customer service authority by operation and maintenance sub system.
Based on above-mentioned introduction, Fig. 2 is the flow chart of group-calling service implementation method embodiment of the present invention.As shown in Figure 2, may further comprise the steps:
Step 201: the user terminal start, carry out and adhere to (Attach) process, carry out network registry, set up default bearer.
Step 202: user terminal to implement cluster service log-on.
Fig. 3 is network registry and a group service registration process schematic diagram among the inventive method embodiment.As shown in Figure 3, the specific implementation of Attach process is a prior art, repeats no more; Default bearer is made up of S1 carrying between the radio bearer between user terminal and the E-eNodeB, E-eNodeB and the S-GW and the carrying of the S5/S8 between S-GW and the eP-GW.
After default bearer was set up and finished, user terminal utilized Non-Access Stratum (NAS, Non Access Stratum) message to eMME signalling of bouquet service log-on request message (Trunking Service Registration Request); EMME carries out authentication to user terminal, after authentication is passed through, finishes the group service registration, and accepts message (Trunking Service Registration Accept) to the registration of user terminal loopback group service.How authentication is a prior art, repeats no more.
After registration is finished, user terminal promptly is in connection status (CONNECTED), if after this this user terminal long period is not carried out information interaction with network side, then can enter idle condition (IDLE), radio bearer and the S1 carrying in the default bearer of being set up will be deleted by system this moment.
The step of above-mentioned steps 201 and 202 for carrying out after each user terminal start.
Step 203: call subscriber terminal sends the group calling request message to network side, and group calling is set up in request; Network side is this call setup S5/S8 carrying.
In the present embodiment, will initiate group calling requesting users terminal and be called call subscriber terminal, other user terminal in will this group except that this calling subscriber is called called user terminal.
In this step, call subscriber terminal determines whether self is in connection status, if then directly send the group calling request message by NAS message to eMME; If not, then at first initiate random access procedure and RRC sets up process, finish the uplink synchronous with place E-eNodeB, and obtain the signaling bear resource that is used to send the group calling request message, send the group calling request message by NAS message to eMME then.
EMME carries out service authentication to call subscriber terminal after receiving group calling request message from calling terminal, if authentication is not passed through, then refuses the group calling request of call subscriber terminal, process ends; If authentication is passed through, then user profile in eHSS asks the group of this calling is obtained this and is called out parameters such as corresponding E-eNodeB tabulation, group priority, and be that this call setup S5/S8 carries according to these parameters.
Wherein, the mode of setting up of S5/S8 carrying is: eMME sends to S-GW and carries the E-eNodeB isoparametric establishment bearing request message of tabulating; S-GW is this call distribution bearing resource, and distributes corresponding S-GW S5/S8-TEID at each E-eNodeB in the E-eNodeB tabulation, sends to eP-GW; EP-GW is this call distribution bearing resource, and is returned as the eP-GW S5/S8-TEID of this call distribution to S-GW; S-GW writes down the mapping relations of S-GW S5/S8-TEID and eP-GW S5/S8-TEID, and distributes corresponding S-GW S1-TEID at each E-eNodeB in the E-eNodeB tabulation, and sends to eMME, finishes the S5/S8 carrying and sets up.
Step 204: network side is that call subscriber terminal distributes uplink resource, and sets up radio bearer and S1 carrying; Simultaneously, network side is called out the called user terminal that belongs to same sub-district in all corresponding called user terminals for this and is distributed the down-chain resource of sharing, and the advise called subscriber terminal.
In this step, the E-eNodeB at eMME indication call subscriber terminal place is that call subscriber terminal distributes uplink resource; The E-eNodeB at call subscriber terminal place sends RRC to call subscriber terminal and connects reconfiguration message, wherein carries uplink resource and describes and relevant configuration information; Call subscriber terminal is according to each layer parameter of information configuration self of receiving, and returns RRC to the E-eNodeB at place and connect to reshuffle and finish message, finishes radio bearer and sets up; The E-eNodeB at call subscriber terminal place receive RRC connect reshuffle finish after, be this call distribution E-eNodeB S1-TEID, and send to eMME; EMME sends to S-GW with E-eNodeB S1-TEID; The mapping relations of S-GW record E-eNodeB S1-TEID and S-GW S1-TEID are returned acknowledge message to eMME, finish the S1 carrying and set up.
Simultaneously, each E-eNodeB in the eMME indication E-eNodeB tabulation is its included cell allocation down link shared resource; Each E-eNodeB carries out the down link shared resource and distributes, and the advise called subscriber terminal; Simultaneously, each E-eNodeB returns acknowledge message to eMME, and indication eMME sets up the S1 carrying.
EMME receives the affirmation message from each E-eNodeB, and obtaining each E-eNodeB that wherein carries is the E-eNodeB S1-TEID of this call distribution, and sends to S-GW; S-GW writes down E-eNodeB S1-TEID and S-GW S1-TEID, and the mapping relations between S-GW S1-TEID and the S-GW S5/S8-TEID, and returns acknowledge message to eMME, confirms S1 carrying foundation.
Step 205: network side is that call subscriber terminal is authorized speaking right, and the advise called subscriber terminal, finishes call setup.
In this step, eMME confirms to receive the affirmation message that the arbitrary E-eNodeB in the E-eNodeB tabulation returns, and confirm that this E-eNodeB that returns acknowledge message and set up S1 carrying between the S-GW, then the E-eNodeB by the call subscriber terminal place sends the group calling authorization messages to call subscriber terminal, authorizes the call subscriber terminal speaking right; Simultaneously, eMME sends service informing message to the E-eNodeB that returns acknowledge message, carries out right of speech by it to included called user terminal and takies prompting, finishes call setup.
Follow-up, can enter normal group calling communication process, call subscriber terminal can pass through E-eNodeB, S-GW, and Business Stream is sent to eP-GW; Then, eP-GW shines upon Business Stream and duplicates, and is distributed to S-GW; Afterwards, S-GW sends to each E-eNodeB in the E-eNodeB tabulation with Business Stream; At last, each E-eNodeB sends to self each included called user terminal with Business Stream.
Because in the group calling communication process, a large number of users terminal in the group is in accepting state for a long time, synchronization only has a user terminal to be in emission state, therefore at call establishment stage, do not need to distribute uplink resource for the called user terminal in organizing, if in the group calling communication process, called user terminal need carry out ul transmissions, can be the transmission that this user terminal distributes uplink resource fast and finishes the Business Stream such as voice, data of up link so, thereby effectively improve the availability of frequency spectrum of system.
Below by example, the specific implementation of step 202～205 is described in further detail.
Fig. 4 is the call establishment schematic diagram among the inventive method embodiment.As shown in Figure 4, part shown in A wherein, B, C, the D is corresponding step 202～205 respectively, and C part wherein is made up of C1 and two subdivisions of C2 of executed in parallel; In addition, suppose that the UE1 among the figure is a call subscriber terminal, UE2 and UE3 are called user terminal.
If when A initiated group calling, call subscriber terminal was in connection status, then when the user import sets of numbers, when pressing the PTT key, call subscriber terminal directly utilizes the E-eNodeB of NAS message by self place to eMME transmission group calling request message; If when initiating group calling, call subscriber terminal is in idle condition, then call subscriber terminal need at first be initiated random access procedure (Random Access) and RRC sets up process, by these two processes, the uplink synchronous of the E-eNodeB at call subscriber terminal foundation and self place, and the signaling bear resource of acquisition transmission group calling request message, send the group calling request message by NAS message to eMME then.
Portability has parameters such as call subscriber terminal number, sets of numbers, urgent sign, type of service and type of call in the group calling request message.Wherein, urgent sign is used to identify whether this calling is urgent call, promptly whether needs priority treatment; Type of service is used to identify this calling and is audio call, or video call etc.; It is group calling or individual calling etc. that type of call is used to identify this group calling.The specific implementation that above-mentioned random access procedure and RRC set up process is prior art, repeats no more.
After B, eMME receive the group calling request message, call subscriber terminal is carried out authentication, and create the proprietary S5/S8 carrying of group calling, specific implementation comprises:
B1, eMME and eHSS carry out Signalling exchange, and call subscriber terminal is carried out service authentication, and ask this to call out corresponding group user profile to eHSS.
The authentication content comprises this call subscriber terminal group-calling service etc. of whether having the right to initiate; If authentication is not passed through, then eMME can return the message that has Reason For Denial, the group calling request of refusal call subscriber terminal, and group calling finishes; If authentication is passed through, then eMME is to eHSS request group user profile, the parameters such as E-eNodeB tabulation, multicast ip address and group priority that comprise all user terminal places in the group call region, if group calling need be handled through dispatching desk, so also will further comprise parameters such as dispatching desk tabulation.
B2, eMME send to S-GW and create cluster carrying request (Create Trunking Bearer Request) message, come the carrying for this call setup S5/S8.Portability has information such as sets of numbers, E-eNodeB tabulation and group priority in the Create Trunking Bearer Request message; Information such as sets of numbers wherein and group priority will be used in follow-up group calling communication process, as are used for voice packet etc., and follow-up analogue repeats no more.
B3, S-GW are this call distribution bearing resource, and distribute corresponding S-GW S5/S8-TEID at each E-eNodeB in the E-eNodeB tabulation, send Create Trunking Bearer Request message to eP-GW subsequently, carry information such as sets of numbers, S-GW S5/S8-TEID, group priority in the message.
B4.eP-GW is this call distribution bearing resource, and returns establishment cluster carrying response (Create Trunking Bearer Response) message to S-GW, carries in the message to this and calls out the eP-GW S5/S8-TEID that is distributed.
The mapping relations of b5, S-GW record S-GW S5/S8-TEID and ep-GW S5/S8-TEID, and distribute corresponding S-GW S1-TEID at each E-eNodeB in the E-eNodeB tabulation, send Create Trunking Bearer Response message to eMME, carry the corresponding S-GW S1-TEID with each E-eNodeB in the message, the S5/S8 carrying is set up and is finished.
The E-eNodeB at C1, eMME indication call subscriber terminal place is that call subscriber terminal distributes uplink resource, sets up radio bearer, simultaneously, sets up the S1 carrying between E-eNodeB and the S-GW, and detailed process comprises:
C1, eMME set up request and group calling acceptance (Trunking Bearer Setup Request/Group Call Accept) message to the carrying of the E-eNodeB at call subscriber terminal place signalling of bouquet, carry call subscriber terminal number, sets of numbers, group priority, the S-GW S1-TEID corresponding in the message with the E-eNodeB at call subscriber terminal place, and parameter such as multicast ip address.
The E-eNodeB at c2, call subscriber terminal place sends the RRC connection to call subscriber terminal and reshuffles (RRC Connection Reconfiguration) message, revising the RRC that has set up connects, finish the foundation of radio bearer, carry uplink resource in this message and describe (as the physical channel configuration) and other relevant configuration information.
After c3, call subscriber terminal configure the parameter of each layer according to uplink resource description that receives and relevant configuration information etc., return RRC to the E-eNodeB at place and connect to reshuffle and finish (RRC Connection Reconfiguration Complete) message, confirm that radio bearer sets up.
After the E-eNodeB at c4, call subscriber terminal place receives RRC Connection Reconfiguration Complete message, set up response (Trunking Bearer Setup Response) message to the carrying of eMME signalling of bouquet, carry the E-eNodeB S1-TEID of the E-eNodeB at call subscriber terminal place in this message for this call distribution.
C5, eMME send to S-GW and revise cluster carrying request (Modify Trunking Bearer Request) message, carry the E-eNodeB S1-TEID of the E-eNodeB at call subscriber terminal place for this call distribution in this message; Then, S-GW record E-eNodeB S1-TEID and S-GWS1-TEID, and the mapping relations between S-GW S1-TEID and the S-GW S5/S8-TEID, return modification cluster carrying response (Modify Trunking Bearer Response) message to eMME, confirm that S1 carries foundation and finishes.
Each E-eNodeB allocation of downlink shared resource in the sub-district that it comprised in C2, the eMME indication E-eNodeB tabulation, and set up the S1 carrying of each E-eNodeB to S-GW, specific implementation comprises:
C1 ', eMME each E-eNodeB in the E-eNodeB tabulation sends Trunking Bearer Setup Request/Group Call Setup Request message, indicates each E-eNodeB allocation of downlink shared resource in the sub-district that is comprised.
Wherein, carrying sets of numbers, group priority, S-GW in the Trunking Bearer Setup Request/Group Call Setup Request message is parameters such as the S-GW S1-TEID that distributes of corresponding E-eNodeB and multicast ip address.
C2 ', E-eNodeB carry out following two processes after finishing the distribution of down link shared resource concurrently:
One, E-eNodeB is with the down link shared resource advise called subscriber terminal of distributing: E-eNodeB periodically broadcasts the group calling notification message in each sub-district that it comprised, carry the description of down link shared resource and multicast ip address and other relevant configuration information of having distributed in the message; After called user terminal receives the group calling notification message, be configured, join group calling immediately after configuration is finished according to the information such as down link shared resource description of wherein carrying.
Two, E-eNodeB sends Trunking Bearer Setup Response message to eMME, wherein carries the E-eNodeB S1-TEID of E-eNodeB for this call distribution; Afterwards, eMME sends Modify Trunking Bearer Request message to S-GW and sets up the S1 carrying, carries E-eNodeBS1-TEID in the message; Mapping relations between S-GW record E-eNodeB S1-TEID and S-GW S1-TEID and S-GW S1-TEID and the S-GW S5/S8-TEID, and, confirm S1 carrying foundation to eMME transmission Modify Trunking Bearer Response message.
D, eMME authorize speaking right to call subscriber terminal, and send service informing information to called user terminal, and detailed process comprises:
D1, as long as eMME receives the Trunking Bearer Setup Response message that any one E-eNodeB in the E-eNodeB tabulation sends, and this E-eNodeB has finished and S-GW between S1 carrying set up, then eMME can send group calling mandate (Group Call Floor Grant) message to the E-eNodeB at call subscriber terminal place, authorize speaking right to call subscriber terminal, carry parameters such as sets of numbers and multicast ip address in the message.
D2, meanwhile, eMME sends service informing information (Group Call Alert With Information) to the E-eNodeB that sends Trunking Bearer Setup Response message, wherein carries parameters such as sets of numbers and call subscriber terminal number; After called user terminal receives this message from E-eNodeB, ring ring and display of calling user terminal number, sets of numbers and right of speech and take prompting, call setup is finished.
In the group calling communication process subsequently, for other E-eNodeB in the E-eNodeB tabulation, receive the Trunking Bearer Setup Response message of these E-eNodeB as eMME, and after finishing S1 carrying foundation, promptly carry out described d2 step, the called user terminal included to these E-eNodeB sends service informing information, and specific implementation repeats no more.
In the group calling communication process, for called user terminal, E-eNodeB is by broadcast mode communicating downlink data.
Need to prove, shown in Figure 4 only for illustrating, for simplifying accompanying drawing, do not demonstrate all Signalling exchange flow processs.
In a word, adopt technical scheme of the present invention, because the TD-LTE system adopts the all-IP flattening network architecture, the base station directly links to each other with core net, the base station is indicated according to network side and is directly finished wireless resource allocation, therefore the Signalling exchange in the group call establishment process obviously reduces, and calling establishment time delay shortens greatly; In addition, the TD-LTE system adopts advanced air interface technologies, and the wireless transmission time delay also can reduce greatly; Have, in the scheme of the present invention, adopt parallel message process mode, network side is call subscriber terminal and called user terminal Resources allocation concurrently, sets up radio bearer and S1 carrying etc., has further shortened calling establishment time delay; At last, owing to the TD-LTE system realizes based on packet domain, therefore be convenient to smoothly evolution backward.
In sum, more than be preferred embodiment of the present invention only, be not to be used to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. group-calling service implementation method, this method are based on time-division Long Term Evolution TD-LTE wideband digital trunking communication system realizing, and network registry is carried out in each user terminal start in the system, sets up default bearer, and carries out the group service registration; It is characterized in that when needs were set up group calling, this method comprised:
Call subscriber terminal sends the group calling request message to network side, and group calling is set up in request;
Network side is this call setup S5/S8 carrying;
Network side is that call subscriber terminal distributes uplink resource, and sets up radio bearer and S1 carrying; Simultaneously, network side is called out the called user terminal that belongs to same sub-district in all corresponding called user terminals for this and is distributed the down-chain resource of sharing, and the advise called subscriber terminal;
Network side is that call subscriber terminal is authorized speaking right, and the advise called subscriber terminal, finishes call setup;
Wherein, described network side comprises for this call setup S5/S8 carrying: after enhancement mode mobile management entity eMME receives group calling request message from described call subscriber terminal, described call subscriber terminal is carried out service authentication, if authentication is not passed through, then refuse the group calling request of described call subscriber terminal, process ends; If authentication is passed through, then ask this to call out corresponding enhanced base station E-eNodeB tabulation, group priority parameters, and be this call setup S5/S8 carrying according to the parameter of asking to enhancement mode home subscriber server eHSS;
Described this call setup S5/S8 of being carrying comprises: described eMME sends the establishment bearing request message that carries described E-eNodeB tabulation to gateway S-GW; Described S-GW is this call distribution bearing resource, and distributes corresponding S-GWS5/S8-TEID at each E-eNodeB in the described E-eNodeB tabulation, sends to enhanced packet data network gateway eP-GW; Described eP-GW is this call distribution bearing resource, and is returned as the eP-GW S5/S8-TEID of this call distribution to described S-GW; Described S-GW writes down the mapping relations of described S-GW S5/S8-TEID and described eP-GW S5/S8-TEID, finishes the S5/S8 carrying and sets up, and for each E-eNodeB in the described E-eNodeB tabulation distributes corresponding S-GW S1-TEID, send to described eMME;
Described network side is that described call subscriber terminal distributes uplink resource, and sets up radio bearer and the S1 carrying comprises: it is that described call subscriber terminal distributes uplink resource that eMME indicates the E-eNodeB at described call subscriber terminal place; The E-eNodeB at described call subscriber terminal place sends RRC to described call subscriber terminal and connects reconfiguration message, wherein carries uplink resource and describes and relevant configuration information; Described call subscriber terminal is according to each layer parameter of information configuration self that receives, and returns RRC to the E-eNodeB at place and connect to reshuffle and finish message, finishes radio bearer and sets up; The E-eNodeB at described call subscriber terminal place receive described RRC connect reshuffle finish message after, be this call distribution E-eNodeBS1-TEID, and send to described eMME; Described eMME sends to S-GW with described E-eNodeB S1-TEID; Described S-GW writes down the mapping relations of described E-eNodeB S1-TEID and pre-assigned S-GW S1-TEID, and returns acknowledge message to described eMME, finishes the S1 carrying and sets up.
2. method according to claim 1 is characterized in that, described call subscriber terminal sends the group calling request message to network side and comprises:
Call subscriber terminal determines whether self is in connection status, if then directly send the group calling request message by non access stratum NAS message to eMME; If not, then at first initiate random access procedure and be connected the process of foundation with radio resource control RRC, finish the uplink synchronous with the E-eNodeB at place, and obtain the signaling bear resource that is used to send the group calling request message, send the group calling request message by described NAS message to eMME then.
3. method according to claim 1 is characterized in that, described network side is called out the called user terminal that belongs to same sub-district in all corresponding called user terminals for this and distributed the down-chain resource of sharing, and the advise called subscriber terminal comprises:
This each E-eNodeB that calls out in the corresponding E-eNodeB tabulation that described eMME indication gets access in advance is included separately cell allocation down link shared resource;
Described each E-eNodeB carries out the down link shared resource and distributes, and the advise called subscriber terminal; Simultaneously, described each E-eNodeB returns acknowledge message to described eMME, indicates described eMME to set up the S1 carrying.
4. method according to claim 3 is characterized in that, described down link shared resource advise called subscriber terminal is comprised:
Described each E-eNodeB periodically broadcasts the group calling notification message in its included sub-district, carry the down link shared resource that has distributed in the message and describe;
Called user terminal is described according to the down link shared resource that receives and is configured.
5. method according to claim 3 is characterized in that, the described eMME of described indication sets up the S1 carrying and comprises:
Described eMME receives the affirmation message from each E-eNodeB, and obtaining each E-eNodeB that wherein carries is the E-eNodeB S1-TEID of this call distribution, and sends to S-GW;
Described S-GW writes down described E-eNodeB S1-TEID and calls out pre-assigned S-GWS1-TEID for this, and the mapping relations between described S-GW S1-TEID and the described S-GW S5/S8-TEID, and return acknowledge message to described eMME, confirm that the S1 carrying sets up.
6. method according to claim 1 is characterized in that, described network side is that call subscriber terminal is authorized speaking right, and the advise called subscriber terminal comprises:
Described eMME confirms to receive the affirmation message that the arbitrary E-eNodeB in the E-eNodeB tabulation that gets access in advance returns, and confirm that this E-eNodeB that returns acknowledge message and set up S1 carrying between the S-GW, then the E-eNodeB by the call subscriber terminal place sends the group calling authorization messages to call subscriber terminal, authorizes the call subscriber terminal speaking right;
Described eMME sends service informing message to the E-eNodeB that returns acknowledge message, carries out right of speech by this E-eNodeB that returns acknowledge message to included called user terminal and takies prompting.
7. according to each described method in the claim 1～6, it is characterized in that described network side is that call subscriber terminal is authorized speaking right, and the advise called subscriber terminal, finishes after the call setup, further comprises:
To shine upon from the Business Stream of caller user terminal, duplicate and distribution processor, and be sent to called user terminal.
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