CN103428636B

CN103428636B - A kind of group-calling set-up method

Info

Publication number: CN103428636B
Application number: CN201210154908.9A
Authority: CN
Inventors: 常艳; 任世岩; 蒋石竹; 徐晖; 艾明; 谌丽
Original assignee: China Academy of Telecommunications Technology CATT; Datang Mobile Communications Equipment Co Ltd
Current assignee: China Academy of Telecommunications Technology CATT; Datang Mobile Communications Equipment Co Ltd
Priority date: 2012-05-17
Filing date: 2012-05-17
Publication date: 2016-04-06
Anticipated expiration: 2032-05-17
Also published as: CN103428636A

Abstract

The invention discloses a kind of group-calling set-up method, in order to reduce Signalling exchange in group calling Establishing process, and then reduce group calling setup delay, improve group calling and set up efficiency.A kind of group-calling set-up method provided by the invention comprises: cluster mobility session management entity TMSE, and request is set up in the group calling received from calling subscriber equipment UE; This group calling request of setting up is converted to SIP (Session Initiation Protocol) and invites Invite message by TMSE, wherein carries group calling and sets up instruction, and by this SIP? Invite message sends to dispatch server Server.

Description

Group call establishment method

Technical Field

The invention relates to the technical field of communication, in particular to a group call establishment method.

Background

The information industry department of 12/28/2000 formally releases a 'digital trunking mobile communication system' to the outside, and recommends that a trunking uses two systems, namely terrestrial trunked radio (TETRA) and Integrated Digital Enhanced Networks (iDEN). In the following years, Code Division Multiple Access (CDMA) technology-based open cluster architecture (GOTA) and global system for mobile communications (GT) 800, which were independently developed in China, were introduced.

With the rapid development of the mobile internet and the popularization of the TD-LTE technology, the demand for broadband mobile communication is more and more obvious, and the cluster system is also developing towards the IP system architecture, broadband data, and the like. In 2010, CCSA has formally approved research report of TD-LTE based trunking communication system, and three implementation schemes based on TD-LTE broadband multimedia trunking are proposed in the report.

The most typical service in a trunking system is a group call service, i.e. a user may initiate a call to a specific group at a certain time, the call being in a half duplex mode. In a broadband multimedia system, a cluster can provide not only voice group calling but also services such as visual group calling for users. The group calling features that only one person is allowed to talk at any time, the speaking party obtains the uplink resource, other users are in answering state, the system allocates a downlink shared channel to each cell involved in the group, and the users in the group in the cell all monitor the shared channel in real time. Therefore, only one uplink and one shared downlink are provided at any moment in the cluster group calling process, and the frequency spectrum resources are utilized more efficiently than those of the public network. The half-duplex group call has another characteristic that the speaking right allows the operations of applying, releasing, preempting, queuing and the like, and the management process of the speaking right is closely related to the priority of the user. In addition, the group call setup delay is one of the key indicators of the trunking call, and any trunking system needs to satisfy the system characteristics of fast access. The group call setup delay is defined as the time from when a calling party presses a push-to-talk (PTT) button until a called party hears the calling party's voice.

The TETRA system is a european standard, the trunking function is the most powerful, but the system equipment and the user equipment are expensive, although the air interface is open to the outside, other interfaces inside the system are all secret, and the interoperability between equipment merchants is not high. The iDEN system is a unique standard, and the system standard is not published externally.

In a domestic narrow-band digital trunking system, such as a GT800 based on GSM and a GOTA system based on CDMA, because a base station needs to be uniformly controlled by a base station controller, it cannot directly communicate with a core network, so that signaling interaction in a group call establishment process is increased, and call establishment delay is increased.

Among three TD-LTE broadband multimedia trunking schemes proposed by the CCSA, the first scheme modifies the air interface to achieve the purpose of enhancing the group call performance, the second scheme proposes to implement the broadband trunking by using a push-to-talk over cellular (Poc) service to perform an enhancement mode, and the third scheme uses a multicast and broadcast service (MBMS) joint transmission mode to achieve the enhancement of the group call performance based on the Poc scheme. The three schemes have some disadvantages in the group call performance scheme, and although the first scheme optimizes the air interface, as the public network architecture of the TD-LTE core network is adopted, multiple interactions are needed among all devices of the core network in the group call establishment process, which is not beneficial to shortening the group call establishment delay; the second scheme and the third scheme both use standard Poc service to perform enhancement mode, and because the Poc service has limited optimization space due to flow limitation. Although the third scheme employs the MBMS joint transmission scheme to optimize the air interface, the overall scheme optimization is not obvious.

Disclosure of Invention

The embodiment of the invention provides a group call establishment method, which is used for reducing signaling interaction in a group call establishment process, further reducing group call establishment delay and improving group call establishment efficiency.

The group call establishing method provided by the embodiment of the invention comprises the following steps:

the cluster mobility session management entity TMSE receives a group call establishment request from calling user equipment UE;

the TMSE converts the group call establishment request into a session initiation protocol SIP Invite message which carries a group call establishment instruction and sends the SIP Invite message to a scheduling Server.

the TMSE to which the called user equipment belongs receives an Invite message sent by a scheduling Server, wherein the Invite message comprises an identifier of calling user equipment initiating a group call establishment request and an identifier of the called user equipment;

the TMSE responds an indication message that the user does not exist to the scheduling Server if no user equipment in the group is determined to be served by the TMSE according to the Invite message; otherwise, sending a paging request to the eNB.

the dispatching Server receives a session initiation protocol SIP Invite message sent by a cluster mobility session management entity TMSE, and acquires a group call establishment instruction from a calling user from the Invite message;

when the calling user is successfully authorized, the scheduling Server informs the TMSE that the group call establishment indicates that the corresponding group call is in progress.

In the embodiment of the invention, a group call establishment request from calling User Equipment (UE) is received through a cluster mobile session management entity (TMSE); the TMSE converts the group call establishment request into a session initiation protocol SIP Invite message which carries a group call establishment instruction and sends the SIP Invite message to a scheduling Server, thereby reducing signaling interaction in the group call establishment flow, further reducing group call establishment delay and improving group call establishment efficiency.

Drawings

Fig. 1 is a schematic network architecture diagram of a TD-LTE broadband multimedia cluster according to an embodiment of the present invention;

fig. 2 is a schematic overall flowchart of the cluster user startup registration according to the embodiment of the present invention;

fig. 3 is a schematic overall flow chart of group call establishment initiated by a cluster user according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a group call establishment procedure at a cluster mobility session management entity to which a calling subscriber belongs according to an embodiment of the present invention;

fig. 5 is a schematic diagram of a group call establishment procedure at a cluster mobility session management entity to which a called user belongs according to an embodiment of the present invention;

fig. 6 is a schematic diagram of a group call setup procedure on a scheduling server side according to an embodiment of the present invention.

Detailed Description

As shown in fig. 1, the network architecture of the TD-LTE broadband multimedia cluster according to the embodiment of the present invention includes a User Equipment (UE), an evolved node b (eNB), a cluster mobility session management entity (TMSE), a Home Subscriber Server (HSS), a scheduling Server (Server), a scheduling console, and an operation maintenance console.

The core network under the system architecture adopts a centralized idea, the functions of core network equipment are unified by TMSE, and the TMSE directly controls all TD-LTE base station equipment under the jurisdiction so as to reduce signaling interaction in the group call establishment process.

The following gives a functional introduction of each network entity:

the user equipment refers to equipment directly operated by a cluster user, and provides cluster services, data services and the like for the user. According to the form of connection to the system, there are two types of devices, wireless user equipment and wired user equipment. According to the function, the wireless user equipment is divided into common wireless user equipment and wireless scheduling user equipment with a scheduling function. According to the external shape, the wireless user equipment can be divided into handheld user equipment, a vehicle-mounted station and the like, wherein the handheld user equipment is a portable device commonly used by cluster users and provides various services for users in a mobile environment; a vehicle-mounted station is a user device mounted on a vehicle such as a vehicle or a ship.

The eNB in the system adds functions required for realizing cluster services on the basis of a TD-LTE system base station (eNodeB), and the functions comprise: transparently passing signaling for the trunking service between the wireless user equipment and the TMSE, allocating radio resources for the wireless user equipment and the trunking service, passing downlink data of the trunking service received from the TMSE to the wireless user equipment, etc.

The TMSE is a main network element of a core network portion of the TD-LTE trunking system, and the TMSE first has a function of a Mobility Management Entity (MME) in the LTE system, that is, functions of mobility management, access control, Evolved Packet System (EPS) session management, and the like are realized; secondly, the TMSE also has functions similar to a Packet Data Network (PDN) gateway (PGW) in the LTE system, that is, functions responsible for allocating an IP address to the user equipment, performing quality of service (QoS) control, providing an interface with an external data network, and the like, and importantly, the TMSE also has functions related to a trunking service, including a translation function of implementing a trunking call signaling between the user equipment and the TMSE and an SIP protocol between the TMSE and a dispatch server, and a media processing function of the trunking call, for example, copying and distributing downlink media data to different base stations, and the like.

In addition, the TMSE also needs to have functions such as collecting charging data related to the trunking service.

Preferably, one TMSE entity integrates the MME, SGW and PGW functions in the LTE network, and simplifies the flow in the existing LTE network by an internal method, so as to shorten the time required by the existing flow.

When the network scale is large, wide coverage is realized in a multi-TMSE networking mode.

The HSS is a database used for storing the subscription information of the user and also has the function of an authentication center. To support the cluster service, it is necessary to add related functions to the existing HSS function, for example: management of group subscription data, etc.

The dispatching server is mainly used for finishing dispatching service logic control of cluster group calling, single calling, emergency calling, speaking right management, cluster service authority management and the like, and can realize functions (aiming at a multi-TMSE scene) of media surface data copying, forwarding and the like.

Optionally, when the voice call interworking with the external network is required, the dispatch server has a function of a voice access gateway or a relay gateway.

The scheduling server can manage the cluster user data.

The dispatching desk mainly provides a man-machine operation visual interface, presents information and triggers dispatching services, and can generate an alarm in case of an emergency call.

The operation maintenance platform supports a local operation maintenance platform and a centralized network management, and the specific function comprises a safety function for managing the operation maintenance user authority; a function of configuration modification of office data of equipment network planning; the signaling tracking function is convenient for operation and maintenance and developers to position and analyze the calling process; the method carries out unified fault management on the equipment and provides tools for alarm collection, display, inquiry, fault detection, fault diagnosis and fault processing. In addition, the network element software management function used for daily equipment maintenance operation management function and system software upgrading provides telephone traffic and signaling measurement, service quality measurement, availability measurement, throughput measurement and switching function measurement for each network element, provides a basis for system performance analysis and grasps network operation conditions at any time. The operation maintenance platform also provides an operation log, an access safety log, a system operation log, a network element event notification and an alarm log for the operation of the user access equipment, so that the problem location is facilitated. A service provisioning platform needs to be supported for the HSS device.

The operation maintenance platform can communicate with network elements such as a base station, a TMSE, an HSS, a dispatching desk and the like in the system, so as to realize the sending of the operation maintenance command and the receiving of the response message of each network element to the operation command. Because the IP networking technology is adopted, only the operation maintenance platform is shown in figure 1, and the connection relation with each network element is simplified and displayed.

Aiming at the problems of the existing systems and technologies, the embodiment of the invention provides a group call establishment method based on the TD-LTE broadband multimedia trunking system architecture shown in fig. 1, which can shorten the group call establishment delay more optimally and provide higher bandwidth and better service experience for trunking users by fully utilizing the TD-LTE broadband characteristics. In order to achieve the above object, the technical solution provided by the embodiment of the present invention includes:

after user equipment in the TD-LTE broadband multimedia digital trunking system is started, the user equipment performs network attachment and establishes default load, and after the attachment is successful, a scheduling service registration process from a network equipment TMSE to a scheduling server is triggered; in the process, the authentication of the cluster user and the registration authentication of the scheduling service are completed;

when a user presses a PTT key to initiate a call aiming at a certain designated group, if the calling user equipment is in an IDLE state at the moment, the calling user equipment firstly carries out RRC connection and enters a connection state, and then sends a group call establishment request to network equipment TMSE (trusted remote sensing) through NAS (network attached storage) messages;

after receiving the group call establishment request, the TMSE judges whether the user is successfully authenticated, and if the user is successfully authenticated, the TMSE sends an Invite (Invite) message to a scheduling server; if the group calling request fails, rejecting the group calling request of the user equipment;

after receiving the Invite message, the dispatch server judges whether the calling user equipment has registered the dispatch service, judges whether the calling user equipment has the right to initiate the group call, if so, responds to 181 messages of the Invite to the TMSE, and informs the TMSE to establish unidirectional service bearing for the calling user equipment; if the calling user equipment fails to register the scheduling service, responding to an error response 480 of the Invite to the TMSE, and rejecting the group call request of the calling user equipment;

after the dispatch server sends 181 a message to the TMSE, a final call Invite message is triggered to all connected TMSEs, and a group call initiated by a calling user equipment is notified, for which a downlink shared channel needs to be established;

all TMSEs receiving the terminal call Invite message judge whether user equipment in a group corresponding to the group identification serves the TMSE according to the group identification carried in the message, if not, the message is responded 404 to a scheduling server; if yes, triggering the cell where the user equipment in the group is located to initiate paging of the user equipment in the group;

whether the user equipment in the group is possibly in an IDLE (IDLE) state or a connected (CONNECT) state at the moment, the paging can be responded normally and the user equipment is added into the group session;

as long as one user equipment responds to the paging, the network sends a successful message of group call establishment and carries the speaking right authorization to a group call initiator, namely the calling user equipment;

after receiving the talk right authorization, the group call initiator starts speaking, and the group call establishment process is completed.

The above-mentioned cluster user startup registration process, referring to fig. 2, includes the steps of:

a1.UE sends an attach request message and a cluster network selection indication to eNB, wherein the attach request message comprises: international Mobile Subscriber Identifier (IMSI) or old Globally Unique Temporary Identifier (GUTI), valid last visited Tracking Area Identifier (TAI), UE core network capability, UE specified Discontinuous Reception (DRX) parameter, PDN type, Protocol Configuration Option (PCO), ciphering option transmission flag, attach type, ksiasme (keyset identity), serial number, NAS-MAC (Non-access stratum-mediaessnas control), and additional GUTI.

And A2, the eNB obtains a new TMSE identifier according to an old Globally Unique Temporary Identifier (GUTI) and a cluster selection network indication in a Radio Resource Control (RRC) message parameter carrying the UE attachment request. And if the new TMSE identification cannot be obtained, the eNB selects the new TMSE identification according to strategies such as load and the like.

The eNB then forwards the attach request message to the new TMSE along with the TAI of the cell in which the UE is located and the evolved universal terrestrial radio access network (E-UTRAN) Global cell identity (ECGI).

A3. If the UE identifies itself through the GUTI and the TMSE (namely the TMSE serving the UE) to which the UE belongs is changed due to detachment, the new TMSE uses the GUTI from the UE to acquire the address of the old TMSE and sends an identity identification request message to the old TMSE to request the IMSI of the UE, and the old TMSE returns an identification response to the new TMSE, wherein the identification response comprises the IMSI of the UE, the unused EPS authentication vector, KSIASME and KASME to the new TMSE; if the old TMSE cannot recognize the UE or the integrity check of the attach request message fails (same as the standard integrity protection algorithm in the existing 3GPP protocol), the old TMSE returns an appropriate error cause ("userathenticationfailed") to the new TMSE.

A4. If the UE cannot be identified in neither the new, old TMSE, the new TMSE sends an identification request to the UE requesting the IMSI. The UE informs the network using an identity response message containing the IMSI.

A5. If no UE context exists in the network and the attach request message in step a1 has no integrity protection or ciphering, or if the integrity check fails, the authentication and NAS security establishment procedures of this step (both of which are standard 3GPP protocol procedures) are mandatory. Otherwise, this step may not be performed.

This step only performs the NAS security establishment procedure if the NAS security algorithm changes.

After this step, all NAS messages will be protected by NAS security functions indicated by the TMSE.

A6. If there is an active bearer context in the new TMSE, e.g., it attaches again in the same TMSE without prior detach, the old bearer context is deleted. If the TMSE is changed after the last detach, or the first attach, or the ME identity (MEIdentity) is changed, or the IMSI or GUTI provided by the UE does not have corresponding bearer context information in the TMSE, the TMSE sends a location update request to the HSS, wherein the location update request comprises the TMSE identity (TMSEIdentity), the IMSI, the MEIdentityy, the TMSE capabilities (TMSECapabilities) and the update type (UpdateType). Wherein the TMSE capability indicates an access restriction function status supported by the TMSE; the update type indicates that this is an attach procedure.

Hss sends location delete request message to old TMSE, which deletes mobility management and bearer context. If the old TMSE has an active bearer context, the old TMSE deletes the bearer resource.

A8. The old TMSE returns a location delete response message to the HSS.

The hss sends a location update response message to the new TMSE in reply to the update location message. The location update response message includes IMSI and subscription data, and the subscription data includes one or more PDN subscription context information. Each subscription context contains subscription QoS parameters and an aggregated maximum bit rate for the subscribed APNs (APN-AMBR). The new TMSE verifies that the UE is present in the new Tracking Area (TA). If the UE is not allowed to attach in the TA due to regional restrictions or access restrictions, the TMSE rejects the attach request. If the check is successful, the new TMSE creates a context for the UE. If the Access Point Name (APN) provided by the UE is not allowed for subscription or the HSS rejects the update location, the new TMSE rejects the attach request message. The new TMSE creates a default bearer for the user and allocates IP and a cluster IP address for the UE;

A10. the new TMSE creates a default bearer for the user, allocates an IP address and a cluster IP address for the UE, and sends an initial context setup request (attach accept message (attach accept)) to the eNB, which carries APN, GUTI, PDN type (PDNType), PDN address (PDNAddress), TAI list (TAIList), EPS bearer identity (epsipeearidentity), session management request (SessionManagementRequest), protocol configuration options (protocolinformation options), KSIASME, sequence number (NASsequencenumber), and NAS-MAC, and also needs to carry cluster group identity and NAS-group IP address.

If the new TMSE allocates a new GUTI, the GUTI is also included in the message. This message is included in the cluster S1 interface (S1 _ T) control message initial context setup request (InitialContextSetupRequest), this S1 control message also includes the UE 'S Access Stratum (AS) security context, a list of handover restrictions, bearer QOS parameters, and the UE' S aggregate maximum bit rate (UE-AMBR), EPS bearer ID, and SGW user plane TEID and address.

And A11, the eNB sends an RRC connection reconfiguration message to the UE, wherein the RRC connection reconfiguration message comprises the RBID and the AttachAccept message of the EPS system.

And A12, the UE sends an RRC connection reconfiguration complete message to the eNB.

A13. the enb sends an initial context setup response (InitialContextResponse) message to the new TMSE. The InitialContextResponse message contains the TEID of the eNB and the address of the eNB for downlink traffic of the cluster S1 interface user plane (S1 _ Tu) reference point.

A14. the ue sends a direct transfer (DirectTransfer) message to the eNB, where the message includes an attach complete (attach complete) message, and the attach complete message includes: EPSBearidentity, NASSeQUENCENumber, and NAS-MAC. Through the attach complete message, the UE starts using the NAS security algorithm indicated by the new TMSE.

A15. the enodeb forwards the attach complete message to the new TMSE using the uplink NAS transport message. After the UE obtains the PDN address information in the attach accept message, it may send an uplink data packet to the eNodeB, which encapsulates the uplink data packet in a GRPS tunneling protocol (GTP-U) tunnel and uploads it to the new TMSE. If the UE requests dual address PDN types (Ipv 4 and Ipv 6), but the network only allows single address PDN types (Ipv 4 or Ipv 6), and the network only supports single address bearers, the UE may re-request activation of another address type PDN connection under the same APN.

A16. The new TMSE creates a cluster group downlink bearer link for all groups where the UE is located. That is, for each group, the new TMSE establishes a unidirectional GTP-U tunnel between the new TMSE to the eNB for carrying downlink data from the new TMSE to the eNB.

A17. The new TMSE sends an on-net indication message to the scheduling Server, which is carried by a SIP register request (SIP register) message. The message carries information such as user identification, affiliated group information, TMSE address and the like.

A18. After receiving the network indication message, the scheduling Server authenticates the scheduling service for the UE, and responds a 200OK message to a new TMSE after the authentication is successful. If the authentication fails, responding to the error response code to indicate that the registration of the scheduling service of the UE by the TMSE fails, wherein the new TMSE needs to record the registration failure information of the scheduling service and refuses when the UE initiates the group call service next time.

Referring to fig. 3, a group call setup procedure initiated by a cluster user according to an embodiment of the present invention includes the steps of:

1. the UE1 establishes a Radio Resource Control (RRC) connection first if it is not RRC connected. Then, UE1 initiates a group call setup request to the network, which is transmitted over a Non Access Stratum (NAS) Packet Data Unit (PDU).

The eNB1 receives the group call establishment request and then transmits the group call establishment request to TMSE 1;

2. after receiving the group call establishment request, TMSE1 converts the group call establishment request into a Session Initiation Protocol (SIP) Invite (Invite) message, and sends the Invite message to the scheduling Server, where the message carries: a calling number (the identity or number of the party initiating the group call), and a called number (the identity or number of the group to be called).

3. If an error occurs in the scheduling Server, or it is determined that the UE1 is not authorized to initiate a group call, for example, the calling party UE1 is not a user of the group, an error response code 408 is responded to the TMSE1, and when the TMSE1 receives the error response code 408, the RRC connection is released through a timer;

4. after the scheduling Server successfully authorizes the calling user UE1, a temporary response 181 corresponding to the SIP invite message is sent to TMSE1, and TMSE1 is informed that the call is in progress;

5. if the UE1 is in idle state, TMSE1 establishes an uplink for the calling user, sends an initial context setup request to eNB1;

6. eNB1 should first activate security, and then send an air-interface RRC connection reconfiguration request to the ue;

7. the user equipment receives the data and then performs RRC connection reconfiguration processing, and replies the RRC connection reconfiguration completion to the eNB1 after the RRC connection reconfiguration processing is completed;

8. eNB1 sends an initial context setup response to TMSE 1;

9. if the UE is in a connected state, after the TMSE1 establishes a default bearer for the calling user, initiating a special bearer establishment and sending an E-UTRAN radio access bearer (E-RAB) establishment request, and after receiving the E-RAB establishment request, the eNB1 initiates RRC connection reconfiguration according to the request and establishes the special bearer for the calling user;

10. the eNB1 sends an E-RAB setup response to the TMSE1 after RRC connection reconfiguration is complete.

11. After receiving the sip invite message (which may be performed simultaneously with step 4), the scheduling Server queries the local database according to the information carried in the sip invite message, and acquires the addresses of all TMSEs (TMSE 2 … … TMSEn in fig. 4) to which the called UE (UE 2 … … UEn in fig. 4) of the group call belongs;

the scheduling Server sends an Invite message to the TMSE to which each called UE belongs, where the Invite message carries: an identity of calling UE1 (an identity or number of the user initiating the group call setup request), and an identity of the called UE (an identity or number of each UE in the group that needs to call);

after receiving the Invite message sent by the scheduling Server, each TMSE to which the called UE belongs responds 404 to the scheduling Server if it is determined that no user equipment in the group corresponding to the group identifier is served by the TMSE according to the Invite message; otherwise, sending a paging request to eNB2 to page the called UE;

12. a TMSE (for example, TMSE 2) to which a called UE of a group call belongs sends a group call context (a bearer context for transmitting group call downlink data) setup request message to an eNB2 for a called group user, in order to request the eNB to set up a context for a cluster user group;

13.eNB 2 establishes a group calling context with all downlink users, responds to the group calling context establishment response to TMSE2, and aims to respond to the result that TMSE establishes the context for the cluster user group;

14. after receiving the group call context establishment response message, TMSE2 responds to SIP200OK to dispatch Server, and the message carries contents such as success response code;

15. the scheduling Server replies an Acknowledgement (ACK) message indicating receipt of SIP200OK to TMSE 2;

16. after receiving an off-hook 200OK message of called UE forwarded by any TMSE from TMSE2 to TMSEn, the scheduling Server sends a group call establishment response message to TMSE1 through the 200OK message, and the message carries the talk right authorization at the same time;

17. TMSE1 sends group call setup response to UE1, where the response carries a talk right authorization message for granting talk right to UE 1; the eNB1 performs NAS message direct transmission;

17.1, after receiving the talk right authorization message, the UE1 sends a talk right authorization completion message to the TMSE 1.

18. TMSE1 sends an Acknowledgement (ACK) message to the scheduling Server;

19. (can initiate with step 16 at the same time) the dispatch Server notifies (INFO) the message through SIP, carry the content that the speech right occupies to TMSE 2;

20. after receiving the SIPIN INFO message, TMSE2 replies a message acknowledgement 200OK to the dispatching Server;

21. TMSE2 sends a talk burst taken message to eNB2 instructing eNB2 to send a talk burst taken message to the called user equipment in a broadcast manner.

Therefore, in a TMSE (that is, a TMSE serving a calling UE) side to which the calling UE belongs, referring to fig. 4, a group call setup method provided in an embodiment of the present invention includes:

s101, a cluster mobility session management entity TMSE receives a group call establishment request from calling user equipment UE;

s102, TMSE converts the group call establishment request into a session initiation protocol SIP Invite message, wherein the SIP Invite message carries a group call establishment instruction, and sends the SIP Invite message to a dispatch Server Server.

Preferably, after the TMSE sends the sip invite message to the scheduling Server, the method further includes:

when an error occurs in the scheduling Server or the calling UE has no right to initiate a group call establishment request, the TMSE receives an error response responded by the scheduling Server; or,

when the scheduling Server successfully authorizes the calling UE, the TMSE receives a temporary response sent by the scheduling Server to determine that a group call establishment request initiated by the calling UE is in progress.

Preferably, after the TMSE receives the temporary response sent by the scheduling Server, the method further includes:

if the calling UE is in an idle state, the TMSE establishes an uplink for the calling UE, sends an initial context establishment request to an evolved node B (eNB), and receives an initial context establishment response sent by the eNB;

if the calling UE is in a connected state, after the TMSE establishes a default bearer for the calling UE, initiating a special bearer establishment, and sending an E-UTRAN radio access bearer (E-RAB) establishment request to trigger the eNB to initiate RRC connection reconfiguration to establish the special bearer for the calling user; and the TMSE receives an E-RAB establishment response sent by the eNB after the RRC connection reconfiguration is completed.

Preferably, the method further comprises:

TMSE receives the group call establishment response message sent by the scheduling Server, and acquires the speaking right authorization message from the group call establishment response message;

TMSE sends group call establishment response message to calling user equipment, wherein the message carries the speaking right authorization message.

Preferably, after the TMSE sends a group call setup response message to the calling user equipment, the method further comprises:

TMSE receives the call right authorization completion message returned by the calling user equipment

The TMSE sends a floor grant response message to the dispatch Server.

Preferably, before the TMSE receives the group call setup request from the calling user equipment, the method further comprises:

the TMSE receives the attachment request from the calling user equipment, and after receiving the attachment completion message from the calling user equipment, the TMSE sends an on-line indication message to the scheduling Server.

Preferably, after the TMSE sends an on-network indication message to the scheduling Server, the method further comprises:

and the TMSE receives the scheduling service authentication result message which is replied by the scheduling Server and aims at the calling user equipment.

Correspondingly, referring to fig. 5, on the TMSE (i.e. the TMSE served by the called UE) side to which the called UE belongs, the method for establishing a group call provided in the embodiment of the present invention includes the steps of:

s201, a TMSE to which called user equipment belongs receives an Invite message sent by a scheduling Server, wherein the Invite message comprises an identifier of calling user equipment initiating a group call establishment request and an identifier of called user equipment;

s202, the TMSE responds to an indication message that the user does not exist to a scheduling Server if no user equipment in the group is determined to be served by the TMSE according to the Invite message; otherwise, sending a paging request to the eNB.

Preferably, the method further comprises:

the TMSE sends a group calling context establishment request message to the eNB aiming at the called user equipment, and receives a group calling context establishment response responded by the eNB;

the TMSE sends a SIP200OK message to the dispatch Server and receives an acknowledgement message in reply to the dispatch Server.

Preferably, the method further comprises:

the TMSE receives a speaking right occupation message sent by a scheduling Server;

the TMSE replies a 200OK message to the scheduling Server;

and the TMSE sends the talk right occupation message to the eNB for indicating the eNB to send the talk right occupation message to the called user equipment in a broadcasting mode.

Correspondingly, on the scheduling Server side, referring to fig. 6, a group call establishment method provided by the embodiment of the present invention includes:

s301, a dispatching Server receives a session initiation protocol SIP Invite message sent by a cluster mobility session management entity TMSE, and acquires a group call establishment instruction from a calling user;

s302, when the dispatch Server successfully authorizes the calling user, the dispatch Server informs the TMSE that the group call establishment indicates that the corresponding group call is in progress.

Preferably, after the sip invite message is received by the scheduling Server, the method further includes:

if an error occurs in the scheduling Server or the calling user is determined not to be authorized to initiate the group call, the scheduling Server responds an error response to the TMSE.

Preferably, the method further comprises:

after receiving the SIP invite message, the scheduling Server queries a local database according to the information carried in the SIP invite message, and acquires the addresses of all TMSE (temporary local Mobile subscriber identity) to which the called user of the group call belongs;

and the scheduling Server respectively sends an Invite message to the TMSE to which each called UE belongs, wherein the Invite message carries the identification of the calling user and the identification of the called UE.

Preferably, the method further comprises:

the scheduling Server receives the SIP200OK message that the TMSE to which the called UE belongs replies to the Invite message.

Preferably, the method further comprises:

the scheduling Server replies to the TMSE to which the called UE belongs an acknowledgement message to the SIP200OK message.

Preferably, the method further comprises:

after receiving an off-hook 200OK message of a called user forwarded by a TMSE to which the called UE belongs, the scheduling Server sends a group call establishment response message to the TMSE to which the calling user belongs through the 200OK message, wherein the group call establishment response message carries a talk right authorization message.

Preferably, the method further comprises:

and the scheduling Server receives a speaking right authorization response message returned by the TMSE to which the calling subscriber belongs.

Preferably, the method further comprises:

and dispatching the Server, sending the call right occupation message to the TMSE to which the called party belongs through the SIPIPO message, and receiving a 200OK message replied by the TMSE to which the called party belongs.

Preferably, the method further comprises:

and the scheduling Server receives the on-line indication message sent by the TMSE to which the calling subscriber belongs, and performs scheduling service authentication on the calling subscriber according to the on-line indication message.

Preferably, the method further comprises:

and the scheduling Server replies the scheduling service authentication result aiming at the calling subscriber to the TMSE to which the calling subscriber belongs.

In summary, the embodiment of the present invention provides a group call establishment procedure of a broadband multimedia cluster based on a TD-LTE broadband multimedia cluster architecture, including that a called user can respond to a group call establishment message in an IDLE state or a CONNECT state during the cluster group call establishment process; and, the cluster group call establishment process does not authenticate the initiating user, because each user accessing the network has been registered and authenticated in the cluster user equipment startup authentication process based on fig. 1, if the authentication is passed, the user is considered as a trustable user before the user is cancelled, and the group call establishment process can be directly initiated. Therefore, the broadband multimedia trunking system can provide higher bandwidth and better user experience for users than a narrowband digital trunking system, for example, can provide visual group call service, and the TD-LTE broadband multimedia trunking system provided by the invention has simpler and easier architecture, and can better reduce signaling interaction in a group call establishing process compared with three schemes provided by CCSA (China center for Mobile alliance) so as to achieve the purpose of reducing group call establishing delay.

As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. A group call establishment method is characterized in that the method is applied to a time division evolution type TD-LTE broadband multimedia cluster system, and the system comprises an evolution type base station eNB, a cluster mobility session management entity TMSE, a home subscriber Server HSS and a scheduling Server; the eNB adds functions required for realizing the trunking service on the basis of the TD-LTE system base station, and the functions comprise: transparently transmitting signaling for the trunking service between the user equipment and the TMSE, allocating radio resources for the user equipment and the trunking service, and transmitting downlink data of the trunking service received from the TMSE to the user equipment; the TMSE is a main network element of the core network part of the TD-LTE broadband multimedia trunking system and has the functions related to a mobile management entity MME, a serving gateway SGW, a packet data network gateway PGW and trunking services in the TD-LTE system; the method comprises the following steps:

2. The method of claim 1, wherein after the TMSE sends the sip invite message to the scheduling Server, the method further comprises:

3. The method of claim 2, wherein after the TMSE receives the provisional response from the scheduling Server, the method further comprises:

if the calling UE is in an idle state, the TMSE establishes an uplink for the calling UE, sends an initial context establishment request to an evolved node B (eNB) to which the calling UE belongs, and receives an initial context establishment response sent by the eNB to which the calling UE belongs;

if the calling UE is in a connected state, after the TMSE establishes a default bearer for the calling UE, initiating a special bearer establishment, and sending an E-UTRAN wireless access bearer (E-RAB) establishment request to trigger an eNB to which the calling UE belongs to initiate Radio Resource Control (RRC) connection reconfiguration to establish the special bearer for the calling user; and the TMSE receives an E-RAB establishment response sent by the eNB to which the calling UE belongs after the RRC connection reconfiguration is completed.

4. The method of claim 3, further comprising:

TMSE receives group call establishment response message sent by the scheduling Server, wherein the group call establishment response message comprises a talk right authorization message;

5. The method of claim 4, wherein after the TMSE sends a group call setup response message to the calling subscriber device, the method further comprises:

TMSE receives the speech right authorization completion message replied by the calling user equipment;

the TMSE sends a floor grant response message to the dispatch Server.

6. The method of claim 1, wherein prior to the TMSE receiving the group call setup request from the calling user equipment, the method further comprises:

TMSE receives the attachment request from the calling user equipment, and after receiving the attachment completion message from the calling user equipment, the TMSE sends an on-line indication message to the scheduling Server;

7. The method of claim 6, wherein if the authentication result of the scheduling service indicates authentication failure, the TMSE records registration failure information of the scheduling service for rejecting the group call service initiated by the UE next time.

8. A group call establishment method is characterized in that the method is applied to a time division evolution type TD-LTE broadband multimedia cluster system, and the system comprises an evolution type base station eNB, a cluster mobility session management entity TMSE, a home subscriber Server HSS and a scheduling Server; the eNB adds functions required for realizing the trunking service on the basis of the TD-LTE system base station, and the functions comprise: transparently transmitting signaling for the trunking service between the user equipment and the TMSE, allocating radio resources for the user equipment and the trunking service, and transmitting downlink data of the trunking service received from the TMSE to the user equipment; the TMSE is a main network element of the core network part of the TD-LTE broadband multimedia trunking system and has the functions related to a mobile management entity MME, a serving gateway SGW, a packet data network gateway PGW and trunking services in the TD-LTE system; the method comprises the following steps:

the TMSE responds an indication message that the user does not exist to a scheduling Server if the user equipment corresponding to the called user equipment identifier in the group is determined to be served by the TMSE according to the Invite message; otherwise, sending a paging request to the eNB to which the called user equipment belongs.

9. The method of claim 8, further comprising:

10. The method of claim 9, further comprising:

the TMSE replies a 200OK message to the scheduling Server;

11. A group call establishment method is characterized in that the method is applied to a time division evolution type TD-LTE broadband multimedia cluster system, and the system comprises an evolution type base station eNB, a cluster mobility session management entity TMSE, a home subscriber Server HSS and a scheduling Server; the eNB adds functions required for realizing the trunking service on the basis of the TD-LTE system base station, and the functions comprise: transparently transmitting signaling for the trunking service between the user equipment and the TMSE, allocating radio resources for the user equipment and the trunking service, and transmitting downlink data of the trunking service received from the TMSE to the user equipment; the TMSE is a main network element of the core network part of the TD-LTE broadband multimedia trunking system and has the functions related to a mobile management entity MME, a serving gateway SGW, a packet data network gateway PGW and trunking services in the TD-LTE system; the method comprises the following steps:

12. The method of claim 11, wherein after the sip invite message is received by the scheduling Server, the method further comprises:

13. The method of claim 11, further comprising:

14. The method of claim 13, further comprising:

15. The method of claim 14, further comprising:

16. The method of claim 15, further comprising:

17. The method of claim 16, further comprising:

18. The method of claim 16, further comprising:

and dispatching the Server, after receiving an off-hook 200OK message of the called user forwarded by the TMSE to which the called UE belongs, sending a call right occupation message to the TMSE to which the called user belongs through the SIPINFO message, and receiving a 200OK message replied by the TMSE to which the called user belongs.

19. The method of claim 11, further comprising:

20. The method of claim 19, further comprising: