CN102300167A - Method and system for realizing fail soft - Google Patents

Abstract

The present invention provides a method for realizing fault weakening, the method includes: separating several radio network temporary identifier (RNTI) resources for cluster services; associating RNTI with cluster groups; core network failure or no core network When connecting, when the terminal initiates a cluster call, it sends the cluster number and RNTI to the base station. The base station creates a cluster instance and triggers periodic cluster paging; The RNTI processes the media data of the trunking service and sends it to the terminal. The present invention also provides a system for implementing fault attenuation. Compared with the prior art, the method and system of the present invention reduce the implementation difficulty and indirectly reduce the cost due to the binding of RNTI and cluster ID. and easier to use.

Description

A method and system for realizing fault weakening

technical field

The present invention relates to an LTE (long term evolution, long-term evolution) cluster system, in particular to a method and system for realizing fault weakening.

Background technique

LTE trunking refers to the use of LTE-related technologies to complete the trunking function. The trunking communication system is a dedicated wireless communication system for specific industry applications developed to meet the command and dispatch needs of industry users. In the system, a large number of wireless users share a small number of wireless channels, and the command and dispatch is the main application. It is a multi-purpose, high-efficiency wireless communication system. The trunking communication system has a wide range of application markets in the fields of government departments, public safety, emergency communications, electric power, civil aviation, petrochemical and military.

The trunking communication system has experienced a development process similar to that of the cellular mobile communication system. The first generation trunking system is an analog trunking communication system, which mainly supports voice communication. The earliest analog trunking communication system to enter our country is Nokia's Actionet system, which uses MPT-1327 signaling and is applied in the 450MHz frequency band. Since then, Japan's F.A.S.T and Motorola's Smartnet of the United States have entered our country.

The second-generation trunking system is a narrowband digital trunking communication system, which emerged in the 1990s and began to be deployed in my country around 2004. It is currently the most widely used trunking communication system in China. The digital trunking communication system supports voice and low-speed data (up to 28.8kbps) communication. The representative system is the Terrestrial Trunked Radio (TETRA) system defined by the European Telecommunications Standards Institute (ETSI) and the comprehensive digital enhancement of Motorola in the United States. Integrated Digital Enhanced Networks (iDEN) system, ZTE Corporation developed the Open Trunking Architecture (Global Open Trunking Architecture, GoTa) system based on CDMA1X, and Huawei Technologies Co., Ltd. developed the GT800 system based on GSM. From a domestic point of view, in the last two or three years, TETRA networks have grown the fastest. In the digital trunking communication networks that have been built in the country, the number of TETRA networks accounts for about two-thirds.

Judging from the current development of trunking communication systems in my country, the development of trunking communication systems is far behind the development of public cellular systems, and its technological innovation and industrial chain are not yet complete. In terms of data transmission capability and multimedia service support capability, the current digital narrowband trunking communication system is still relatively backward. For example, the broadband integrated digital enhanced network (Wide-iDEN, WiDEN) launched by the iDEN system after improving the time slot and modulation method increases the peak transmission rate to 384kbps; TETRA Enhanced Data Service (TETRA Release 2 Enhanced Data Service, TEDS), which can ideally support a peak transfer rate of no more than 700kbps; neither is on the order of Mbps. In addition, in terms of spectrum utilization and coverage, the existing digital trunking systems cannot meet the requirements well.

After the launch of LTE technology, the downlink bandwidth of the system exceeds 100 Mbps, the uplink bandwidth exceeds 50 Mbps, and the call setup time is short, less than 100 ms, which meets the characteristics of the broadband trunking system: the trunking communication system communicates in half-duplex mode, and works through push-to-talk ( PushToTalk (PTT) key to control channel acquisition and release, high channel utilization, fast call connection; users in the group share downlink channels, high resource utilization. Moreover, the trunking communication system can ensure the privacy and security of calls through voice encryption; assign channels to high-priority users or services; ensure communication in emergency situations through fault weakening functions; realize flexible multi-level group scheduling through dynamic reorganization Command function; the broadband trunking communication system expands broadband service types around the three basic services of "voice", "data" and "video", including: group call/visual group call, individual call/visual individual call, emergency call, etc. Voice services; data services such as mobile information services, high-speed data query, web browsing, mobile office, and positioning services; video services such as video conferencing and mobile video surveillance; rapid command and dispatch capabilities such as group calls and direct calls; , data, image and video multi-service transmission capabilities; with network interconnection and off-network communication capabilities to support direct or terminal construction of Mesh networks, etc.; high network reliability, with strong fault weakening and invulnerability; support large hotspot areas, Large traffic capacity during hot spots; short call setup, single-system call setup time is less than 300ms.

The LTE cluster will inherit the advanced nature of LTE technology and adopt a flat network architecture to reduce service access delays. As shown in Figure 1, the LTE cluster network includes MME, SGW, eNB (evolved base station), cluster scheduling part, and cluster terminal. In the prior art, LTE trunking introduces two transmission channels: the trunking control channel (TCCH) and the trunking traffic channel (TTCH). The establishment and release of group calls and the notification of the right to speak are realized on the TCCH. There are great risks in channel transmission signaling. For example, if the message is lost, it will cause problems in the state machine, and the states of multiple terminals will be inconsistent; the configuration of sending TTCH on TCCH is generally not implemented in the LTE system, and LTE uses blind detection. The method realizes and simplifies the configuration, but the current implementation method does not make full use of the characteristics of the LTE. How to fully combine the trunking and LTE to give full play to the advantages of LTE in the trunking is an issue that needs to be discussed.

Contents of the invention

The technical problem to be solved by the present invention is to provide a method and system for realizing fault weakening, so that when there is a problem in the core network or the core network is not connected, the cluster can work normally, and the robustness and resilience of the system can be improved.

In order to solve the above problems, the present invention provides a method for implementing fault weakening, including: separating several radio network temporary identifier (RNTI) resources for cluster services; associating RNTI with cluster groups; core network failure or When there is no core network connection, when the terminal initiates a cluster call, it sends the cluster number and RNTI to the base station, and the base station creates a cluster instance and triggers periodic cluster paging; when the network side receives a cluster call from the terminal, it will use the cluster service group The RNTI associated with the group processes the media data of the trunking service and sends it to the terminal.

Further, the method further includes: when the terminal receives the group paging, process the downlink data by using the RNTI associated with the group to which the group service belongs, and acquire the media data of the group service.

Further, the associating the RNTI with the group includes: after the network side establishes the group, obtain an RNTI from the separated RNTI resources, associate the RNTI with the cluster number of the group, and associate the RNTI with the cluster number of the group. The association relationship between the cluster number and the RNTI is stored in the terminals of the group.

Further, when the network side receives the cluster call from the terminal, it uses the RNTI associated with the group to which the cluster service belongs to process the media data of the cluster service, and the step of sending it to the terminal includes: when the core network receives the cluster call, establish a cluster The calling entity triggers cluster paging, and sends a cluster bearer establishment request message to each base station in the cluster area. The cluster bearer establishment request message includes a cluster number and an associated RNTI, and each base station establishes a cluster bearer; the core network sends a cluster media The data is sent to the base stations; the base stations use the RNTI associated with the cluster number to process the cluster media data and send it to the terminal.

Further, the method further includes that the network side modifies the association relationship between the group and the RNTI, and sends the updated association relationship between the group and the RNTI to the terminal.

The present invention also provides a system for implementing fault weakening, including: a network side, which is used for: separating several radio network temporary identifier (RNTI) resources for cluster services; associating RNTI with cluster groups ;When the core network fails or there is no core network connection, the terminal initiates a cluster call and sends the cluster number and RNTI to the base station. The base station creates a cluster instance and triggers periodic cluster paging; when receiving a cluster call from a terminal, it uses the cluster The RNTI associated with the group to which the service belongs processes the media data of the cluster service and sends it to the terminal.

Further, the system further includes a terminal, the terminal is configured to: when receiving the trunking paging, use the RNTI associated with the group to which the trunking service belongs to process the downlink data, and acquire the media data of the trunking service.

Further, the network side is used to: separate several RNTI resources for cluster services; and, after establishing a group, obtain an RNTI from the separated several RNTI resources, and combine the RNTI with the group The cluster number of the cluster number is associated, and the association relationship between the cluster number and the RNTI is stored in the terminal.

Further, the network side includes a core network and a base station, wherein: the core network is used to: when a trunk call is received, establish a trunk call entity, trigger trunk paging, trigger each base station in the trunk area to establish a trunk bearer, and The cluster number and the associated RNTI are sent to the base stations; and, after each base station establishes a cluster bearer, the cluster media data is sent to the base stations; the base stations are used to: establish a cluster bearer; and, receive the core network After sending the group media data, use the RNTI associated with the group number to process the group media data and send it to the terminal.

Further, the network side is further configured to: modify the association relationship between the group and the RNTI, and send the updated association relationship between the group and the RNTI to the terminal.

Compared with the prior art, the method and system of the present invention reduce the difficulty of implementation, indirectly reduce the cost and are easier to use due to the binding of RNTI and cluster ID.

Description of drawings

FIG. 1 is a block diagram of an LTE cluster network structure.

Fig. 2 is a diagram of the establishment process of a fault weakened trunking call in the present invention.

Detailed ways

Below in conjunction with accompanying drawing and embodiment, further illustrate the present invention.

LTE introduces RNTI and uses RNTI to distinguish paging channel, broadcast channel, multicast channel and common channel. The present invention fully combines RNTI with cluster, combines RNTI with business and grouping, and makes full use of the characteristics of LTE.

The technical solution of the present invention is: planning a part of RNTI for cluster business, and establishing an association relationship between cluster groups and RNTI, for example, one group uses one RNTI;

In the case of a core network failure, the relationship between the cluster group and the RNTI is still stored in the UE. When the UE initiates a cluster call, it sends the cluster number and RNTI to the base station. The base station creates a cluster instance and triggers periodic clustering. For paging, when the base station sends a trunking service, it uses the RNTI associated with the group to which the trunking service belongs to process the data. When the terminal receives a trunking paging, it only needs to use the corresponding RNTI to read the downlink data.

The method described in the present invention is as follows:

Initialize first, including:

0. Precondition: Group the RNTI (wireless network temporary identifier), separate a part for cluster business, and put it on the cluster control entity (Trunk Control Entity, TCE) as a resource pool for unified management.

1. The core network establishes a cluster group, requests RNTI resources on the TCE, and associates the RNTI resources with the group, specifically, with the cluster number of the group.

2. When the cluster terminal subscribes to the data, write the cluster number of the group to which the terminal belongs together with the associated RNTI into the terminal. Certainly, the association relationship between the cluster number and the RNTI may also be notified to the terminal in other ways, which is not limited in the present invention.

Among them, after initialization, the association relationship between the group and the RNTI can also be updated, including: the core network modifies the association relationship between the group and the RNTI through the non-access layer message, and realizes the dynamic change of the association relationship between the group to which the UE belongs and the RNTI .

After initialization, group paging is performed, including:

In step S1, the UE initiates a trunking call through unicast. When the core network receives the trunking call, it establishes a trunking call instance, triggers trunking paging, and triggers the process of establishing a trunking bearer to all base stations in the trunking area, and sends the trunking number and associated The RNTI is sent to each base station, specifically, including: the core network sends a cluster bearer establishment request message to each base station in the cluster area, and the cluster bearer establishment request message includes a cluster number and an associated RNTI; each base station establishes a cluster bearer;

In step S2, the core network sends cluster media data to each base station after each base station successfully establishes a cluster bearer;

Step S3, each base station uses the RNTI associated with the cluster number to process the cluster media data and send it to the UE;

The specific processing method is: use the RNTI, the physical message ID and the subframe number to generate a scrambling code, and scramble the CCE;

Step S4, after receiving the cluster paging, the UE processes the downlink data by using the RNTI associated with the cluster number of the group to which the cluster paging belongs, and reads the corresponding cluster media data.

The specific processing method is: use the RNTI, the physical cell ID and the subframe number to generate a scrambling code, descramble the CCE, if the CRC is correct, analyze the DCI, and decode the data according to the DCI.

As shown in Figure 2, it is a process diagram of establishing a fault weakened trunking call in the present invention, including:

Step 201, the UE application triggers a cluster call, and the UE sends a random access request message to the base station;

Step 202, the base station receives the random access request message, allocates uplink resources, and notifies the UE of the uplink resources through a random access response message;

Step 203, the UE receives the random access response message, and sends an RRC (radio resource control) establishment request message to the base station on the allocated uplink resource;

Step 204, the base station receives the RRC establishment request message, allocates relevant physical resources, including SRS (Sounding Reference Signal, demodulation reference signal) and PUCCH (Physics Uplink Control Channel, physical uplink control channel), establishes a UE instance, and sends an RRC establishment Message to UE;

Step 205, the UE receives the RRC establishment message, and sends an RRC establishment completion message to the base station on the physical resources allocated by the base station, and the RRC establishment completion message includes the cluster number and RNTI information;

Step 206, the base station receives the RRC establishment completion message, if it finds that there is a failure in the path with the core network, and carries the cluster number and RNTI, it sends an initial UE context message to the simulated core network of the base station;

Step 207, the simulation core network receives the initial UE context message, constructs an internal initial UE context request message, sends it to the protocol processing module, triggers cluster paging at the same time, and sends a cluster bearer establishment request message to the protocol processing module;

Step 208, the protocol processing module receives the paging, triggers the paging, receives the initial UE context request message, establishes the association relationship between the UE and the cluster instance, and sends an internal cluster bearer establishment request message to the simulated core network; Simulate the core network to send the initial UE context response message to trigger the RRC reconfiguration process.

So far, the loopback of the UE uplink unicast data to the cluster instance is completed, the downlink uses the cluster-related RNTI for data processing, and the terminal receiving the data uses the cluster-related RNTI for data processing, thereby completing the fault weakening function in the case of a core network failure. In the fault weakening function, the same group is only allowed to establish one UE instance with the right to speak, and a first-come, first-served mechanism is adopted.

Claims (10)

1. A method for realizing fault weakening, characterized in that, comprising: Separation of several Radio Network Temporary Identity (RNTI) resources for trunking services; Associate the RNTI with the group of the cluster; When the core network fails or there is no core network connection, the terminal initiates a cluster call and sends the cluster number and RNTI to the base station, and the base station creates a cluster instance and triggers periodic cluster paging; When the network side receives the trunking call from the terminal, it will use the RNTI associated with the group to which the trunking service belongs to process the media data of the trunking service and send it to the terminal. 2. The method of claim 1, further comprising: When the terminal receives the trunking paging, it uses the RNTI associated with the group to which the trunking service belongs to process the downlink data, and acquires the media data of the trunking service. 3. The method according to claim 1 or 2, wherein said associating the RNTI with the group comprises: After the network side establishes a group, obtain an RNTI from the separated RNTI resources, associate the RNTI with the cluster number of the group, and store the association relationship between the cluster number and the RNTI in the group set of terminals. 4. The method according to claim 1, characterized in that, when the network side receives a trunking call from the terminal, it uses the RNTI associated with the group to which the trunking service belongs to process the media data of the trunking service and send it to the terminal include: When the core network receives a cluster call, it establishes a cluster call entity, triggers cluster paging, and sends a cluster bearer establishment request message to each base station in the cluster area. The cluster bearer establishment request message includes a cluster number and an associated RNTI, and each The base station establishes cluster bearer; The core network sends cluster media data to the base stations; Each base station uses the RNTI associated with the cluster number to process the cluster media data and send it to the terminal. 5. The method according to claim 1, 2 or 4, further comprising, the network side modifying the association relationship between the group and the RNTI, and linking the updated group and RNTI The association relationship is sent to the terminal. 6. A cluster service processing system, characterized in that it comprises: a network side, and the network side is used for: separating several radio network temporary identifier (RNTI) resources for cluster services; Associate the RNTI with the group of the cluster; When the core network fails or there is no core network connection, the terminal initiates a cluster call and sends the cluster number and RNTI to the base station, and the base station creates a cluster instance and triggers periodic cluster paging; When receiving the trunking call from the terminal, use the RNTI associated with the group to which the trunking service belongs to process the media data of the trunking service and send it to the terminal. 7. The system according to claim 6, further comprising a terminal, the terminal is configured to: use the RNTI associated with the group to which the trunking service belongs to the downlink data when receiving the trunking paging Processing is performed to acquire the media data of the cluster service. 8. The system according to claim 6 or 7, wherein the network side is used to: separate several RNTI resources for trunking services; and, after establishing a group, from the separated several RNTI resources Obtain an RNTI, associate the RNTI with the cluster number of the group, and store the association relationship between the cluster number and the RNTI in the terminal. 9. The system according to claim 6, wherein the network side includes a core network and a base station, wherein: The core network is used to: when receiving a cluster call, establish a cluster call entity, trigger cluster paging, trigger each base station in the cluster area to establish a cluster bearer, and send the cluster number and associated RNTI to the base stations; and, After each base station establishes a cluster bearer, send cluster media data to each base station; The base stations are used to: establish a cluster bearer; and, after receiving the cluster media data sent by the core network, use the RNTI associated with the cluster number to process the cluster media data and send it to the terminal. 10. The system according to claim 6, 7 or 9, wherein the network side is further configured to: modify the association relationship between the group and the RNTI, and associate the updated group with the RNTI Relationships are sent to the terminal.

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