CN103313202A - Method for supporting broadcast data continuity - Google Patents

Abstract

The invention provides a method for supporting broadcast data continuity. A base station acquires frequency and SAI information of adjacent base stations through S1 interface, X2 interface or air interface, and broadcasts the acquired frequency and SAI information. Therefore, the processing complexity of the UE can be reduced, and continuous transmission of broadcast data can be ensured.

Description

A Method to Support Broadcast Data Continuity

technical field

The invention relates to multimedia broadcast multicast service (MBMS) technology, in particular to a method for supporting broadcast data continuity.

Background technique

FIG. 1 is a system architecture diagram of System Architecture Evolution (SAE), in which a user equipment (UE) 101 is a terminal equipment for receiving data. Evolved Universal Terrestrial Radio Access Network (E-UTRAN) 102 is a radio access network including macro base stations (eNodeBs/NodeBs) that provide UEs with an interface to access the radio network. Mobility Management Entity (MME) 103 is responsible for managing UE's mobility context, session context and security information. Serving Gateway (SGW) 104 mainly provides user plane functions, and MME 103 and SGW 104 may be in the same physical entity. The packet data network gateway (PGW) 105 is responsible for functions such as billing and lawful interception, and may also be in the same physical entity as the SGW 104. A Policy and Charging Rules Function (PCRF) 106 provides Quality of Service (QoS) policies and charging rules. The General Packet Radio Service Support Node (SGSN) 108 is a network node device that provides routing for data transmission in the Universal Mobile Telecommunications System (UMTS). The Home Subscriber Server (HSS) 109 is the home subsystem of the UE, responsible for protecting user information including the current location of the user equipment, the address of the serving node, user security information, and the packet data context of the user equipment.

In order to effectively utilize the air interface resources, some mobile communication services are provided to users in the form of broadcast and multicast. This service is called Multimedia Broadcast and Multicast Service (MBMS, Multimedia Broadcast and Multicast Service). Each MBMS service provides services in its own service area, and each cell in the service area has a dedicated control channel to transmit MBMS signaling. BM-SC is a multimedia broadcast multicast service provider center, MBMS data is sent from BM-SC to MBMS-GW, MBMS-GW is a logical node, it is not excluded that it is other network nodes, it is located between BM-SC and eNB, Responsible for sending/broadcasting MBMS data packets to each eNB to transmit data. MBMS-GW sends data packets to corresponding eNB, and eNB sends data to users. Control signaling is sent from BM-SC to MBMS-GW, and then sent to EUTRAN through MME. MCE is an old node of EUTRAN, receives MBMS signaling, and decides to use MBSFN transmission mode, and then sends signaling to the corresponding eNB.

The MBMS service can be transmitted in a single-carrier cell. In this way, different cells use different carriers, and users at the edge of the cell can only listen to the MBMS service of the current cell. However, if adjacent cells use the same carrier to transmit the same MBMS service and transmit the MBMS service in a synchronous manner, the user can receive the superposition of the two signal energies at the edge of the adjacent cell. Therefore, in the prior art, a continuous area is defined, and in this area, each eNB uses the same carrier to synchronously transmit the same MBMS signal, so as to improve the reception quality of the MBMS service of the user. This continuous area is called Single Frequency Network (SFN, Single Frequency Network) area.

The SFN area includes a group of geographically continuous cells, and these cells use the same radio resources to transmit a specific MBMS service synchronously. The SFN area belongs to and uniquely belongs to one MBMS service area.

Rel-11 will study the continuity of MBMS data reception, and define a mechanism to enable UE to receive MBMS service data with high priority. MBMS data is transmitted in an MBSFN area, and an MBSFN area corresponds to a group of geographically continuous cells, and these cells use the same frequency. Before the service starts, the UE in the idle mode may reside in a cell using other frequencies, and the UE in the connected mode may receive unicast services on other frequencies. When the service is about to start, if the serving cell of the UE does not provide the MBMS service, and the UE sets a high priority for the MBMS service, the UE needs to know which cells can receive the MBMS service. The identification and configuration information of the MBMS service is broadcast on the control channel of the cell. If the UE needs to know where the MBMS service of interest is provided, it needs to receive the control information of the neighboring cell. Although this method can know accurate information, there is UE complexity. Higher, it may affect the reception of the ongoing business, and the disadvantage of being unable to listen to the control information of the neighboring cell in time. Therefore, one solution is that the serving cell needs to provide the service area indication (Service Area Id, SAI for short) and The service area indication of the adjacent frequency, according to the serving cell, the adjacent frequency means that the frequency of the adjacent cell of the serving cell is different from the frequency of the serving cell, and the frequency of the adjacent cell is called the adjacent frequency. Or the frequency of the adjacent cell is different from the frequency of the serving cell. If all the frequencies of the base station where the adjacent cell is located are different from the frequency of the serving cell, they are called adjacent frequencies. Through the broadcast information of the serving cell, the UE can know which frequency the MBMS service is provided on, and receive the MBMS service on the corresponding frequency when the service starts. However, in the prior art, there is no way for various serving cells to obtain service area indications of adjacent frequencies.

Contents of the invention

The present invention provides a method for supporting broadcast continuity, which can reduce the complexity of UE processing and enable the serving cell to obtain the SAI list of adjacent frequencies conveniently and efficiently.

To achieve the above object, the present invention adopts the following technical solutions:

A method of supporting broadcast data continuity comprising:

For any base station A in the system, when a new neighbor cell is discovered, the base station A requests the SAI list corresponding to the frequency of the new neighbor cell through the MME or directly to the base station B where the new neighbor cell is located;

The base station B sends the frequency of the new neighboring cell and the corresponding SAI list to the base station A through the MME or directly, and the base station A broadcasts the frequency of the new neighboring cell and the corresponding SAI list on a broadcast channel.

Preferably, the method for the base station A to request the SAI list corresponding to the frequency of the new neighboring cell is:

The base station A sends an MBMS information request message to the base station B, and carries the identity of the base station B and the frequency of the new neighboring cell, and is used to indicate that the SAI list corresponding to the frequency of the new neighboring cell in the base station B is to be obtained.

Preferably, the MBMS information request message is an existing message or a custom message.

Preferably, the SAI list corresponding to the frequency is: all SAIs corresponding to the cells on the corresponding frequency.

A method of supporting broadcast data continuity comprising:

For any base station A in the system, base station A requests the adjacent base station B to obtain all frequencies in base station B and its corresponding SAI list through MME;

The base station B sends all frequencies in the base station B and their corresponding SAI list to the base station A through the MME, and the base station A broadcasts each frequency received by the base station A and its corresponding SAI list on a broadcast channel.

Preferably, the SAI list corresponding to all frequencies of the base station B is: all SAIs corresponding to cells on each frequency in the base station B;

Each frequency received by the base station A and its corresponding SAI list are: all frequencies of the neighboring base stations of the base station A and a set of SAI lists corresponding to each frequency in all neighboring base stations.

Preferably, when the base station A requests to obtain the SAI list, all frequencies of the base station A and the corresponding SAI list are sent to the base station B through the MME.

Preferably, after the base station B receives the request sent by the base station A through the MME, before sending all frequencies of the base station B and their corresponding SAI lists to the base station A, the method further includes:

After the base station B receives all the frequencies of the base station A and their corresponding SAI lists, it judges whether the base station A and the base station B have the same frequency and corresponding SAI lists, and if so, sends all the frequencies to the base station A. When using the frequency and its corresponding SAI list, only the frequency different from base station A and its corresponding SAI list are sent.

Preferably, after the base station B sends all the frequencies and their corresponding SAI lists, the method further includes: after the base station A receives all the frequencies of the base station B and their corresponding SAI lists, judges that the base station A Whether there is the same frequency as the base station B, and if so, discard the same frequency sent by the base station B and its corresponding SAI list.

Preferably, the base station A sends all the frequencies of the base station A and their corresponding SAI lists to the base station B through the MME as follows: sending the information of each cell in the base station A to the base station B; The information includes the frequency of the cell and the corresponding SAI list;

The base station B sends the all frequencies and their corresponding SAI lists to the base station A through the MME as follows: the base station B sends the information of each cell in the base station B to the base station A through the MME; The information includes the frequency of the cell and the corresponding SAI list.

Preferably, the method for the base station A to request all the frequencies and their corresponding SAI lists is as follows:

The base station A sends to the base station B an MBMS information request message carrying indication information, where the indication information is used to indicate that all frequencies of the base station B and their corresponding SAI lists are to be acquired.

Preferably, the MBMS information request message is an existing message or a custom message; the indication information is explicit indication information, implicit indication information or the name of the MBMS information request message.

A method of supporting broadcast data continuity comprising:

For any base station A in the system, the base station A directly requests the adjacent base station B to obtain the frequency and SAI list corresponding to the cell of the base station B;

The base station B directly sends the frequency and SAI list corresponding to the cell of the base station B to the base station A;

The base station A broadcasts the frequencies of neighboring cells and their corresponding SAI lists on the broadcast channel, or the cell of the base station A broadcasts the frequencies received by the base station A and their corresponding SAI lists on the broadcast channel.

Preferably, when the base station A requests to obtain the SAI list, the frequency corresponding to the cell of the base station A and the SAI list are directly sent to the base station B.

Preferably, after the base station B receives the request sent by the base station A through the MME, before sending the frequency and the SAI list corresponding to the cell of the base station B to the base station A, the method further includes:

After the base station B receives the frequency and the SAI list corresponding to the cell of the base station A, it judges whether the base station A and the base station B have the same frequency and the corresponding SAI list, and if so, sends the base station B to the base station A When the frequency and SAI list corresponding to the cell of base station A, only the SAI list corresponding to the cell of the frequency different from that of base station A is sent.

Preferably, after the base station B sends the frequency and SAI list corresponding to the cell of the base station B, the method further includes: after the base station A receives the frequency and the SAI list corresponding to the cell of the base station B, judge the base station Whether A and base station B have the same frequency and the corresponding SAI list, and if so, discard the same frequency and the corresponding SAI list sent by the base station B.

Preferably, the method for the base station A to request the frequency and SAI list corresponding to the cell of the base station B is as follows:

The base station A sends to the base station B an MBMS information request message carrying indication information, where the indication information is used to indicate that the frequency and the SAI list corresponding to the cell of the base station B are to be obtained.

Preferably, the MBMS information request message is an existing message or a custom message; the indication information is explicit indication information, implicit indication information or the name of the MBMS information request message.

Preferably, the method further includes: when the SAI list of the cell of the base station A is updated, the base station A directly sends the MBMS information request message to its neighboring base stations, and carries the cell information of the base station A in the message Corresponding frequency and updated SAI list;

The neighboring base station receives the MBMS information request message, and if the SAI list of the cell of the neighboring base station is updated, the neighboring base station feeds back to the base station A the frequency corresponding to the cell of the neighboring base station and the updated SAI list.

A method of supporting broadcast data continuity comprising:

The UE detects the information of the neighboring cell, and sends the detected physical cell identity of the neighboring cell C to the base station where the serving cell of the UE is located;

When the base station determines that the neighboring cell C is a new neighboring cell according to the report of the UE, the base station notifies the UE to report the information of the neighboring cell C;

The UE receives the cell identity, frequency information and corresponding SAI list of the neighboring cell C through the broadcast channel of the neighboring cell C, and reports to the base station;

The base station broadcasts the frequency of the neighboring cell C and its corresponding SAI list on a broadcast channel.

A method of supporting broadcast data continuity comprising:

A base station receives the frequency of the neighboring cell and its corresponding SAI list on the broadcast channel of the neighboring cell;

The base station stores and broadcasts the received frequencies and their corresponding SAI lists on the broadcast channel.

It can be seen from the above technical solutions that the method provided by the present invention reduces the complexity of the UE, reduces unnecessary information interaction between base stations, and ensures that the UE can obtain service-related information before the service starts, and can receive service data in time .

Description of drawings

Fig. 1 System Architecture Diagram of System Architecture Evolution (SAE);

FIG. 2 is a system architecture diagram of a current MBMS;

Fig. 3 is a schematic flow chart of the method of Embodiment 1 of the present invention;

4 is a schematic flow diagram of the method of Embodiment 2 of the present invention;

Fig. 5 is a schematic flow chart of the method of Embodiment 3 of the present invention;

FIG. 6 is a schematic flow diagram of a method according to Embodiment 4 of the present invention;

Fig. 7 is a schematic flow chart of the method of Embodiment 5 of the present invention;

Fig. 8 is a schematic flow chart of the method of Embodiment 6 of the present invention;

Fig. 9 is a schematic flow chart of the method of Embodiment 7 of the present invention;

FIG. 10 is a schematic flow chart of the method in Embodiment 8 of the present invention.

Detailed ways

In order to make the purpose, technical means and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

There are many types of base stations in the network at present, and there are differences in coverage, processing capabilities and interfaces. For macro base stations, there is generally an X2 interface, and the SAI of the adjacent base station cell can be obtained when the X2 interface is established; but if there is no X2 interface between base stations, or the serving cell is a home base station cell, there is no X2 connection between the home base station and the macro base station , the serving cell cannot directly obtain the SAI of the adjacent base station cell through the X2 interface, and thus cannot broadcast information on whether the adjacent frequency provides MBMS services in the cell. Considering this point, the present invention provides a method for S1 interface to obtain the SAI list of adjacent base stations, and the specific implementation of the method will be described below through Embodiments 1 to 4.

Embodiment 1 describes that through the S1 interface, the base station requests to obtain the service area indicator SAI list corresponding to a certain frequency of the neighboring base station, and the neighboring base station sends the SAI corresponding to the frequency to the requesting base station. As shown in Figure 3. The method may include the steps of:

Step 301: Base station 1 sends a message "MBMS information request" to MME, requesting to obtain the SAI list corresponding to the specific frequency of adjacent base station 2.

The base station 1 can obtain the cell identity and the frequency of the cell on the adjacent base station through the automatic neighbor cell establishment process, and discover a new cell. The process is as follows: the serving cell of the UE is the cell on the base station 1, the UE detects the information of the surrounding cells, and sends the detected physical cell identities of the surrounding cells to the serving cell. If the specific information of the cell corresponding to the physical cell ID is not stored in base station 1, the specific information includes information such as the ID of the cell, the frequency of the cell, and the routing area ID of the cell; the serving cell sends a message to the UE, requiring the UE to report the The specific information of the neighboring cell, the UE obtains the cell identity and frequency information of the neighboring cell by receiving the broadcast information of the neighboring cell, and reports the above information to the serving cell, and the serving cell saves the cell identity and frequency of the neighboring cell, etc. specific information. Through the above manner, new neighbor cells can be found. If the base station 2 where the newly discovered adjacent cell is located is a newly discovered adjacent base station, and the SAI corresponding to the frequency of the newly discovered adjacent cell on the base station has not been saved on the base station 1, the base station 1 sends "MBMS information request" to the MME, requesting Obtain the SAI list corresponding to the frequency of the new neighboring cell in base station 2.

Wherein, the MBMS information request may be an existing message or a custom message. The message includes the identity of base station 1, the identity of base station 2 and frequency information. The frequency information contained in the message is used to indicate that the base station 1 wants to obtain the SAI corresponding to the frequency from the target base station 2 . Because the target base station may have multiple cells and multiple frequencies, base station 1 needs to indicate to the target base station which frequency the SAI corresponding to needs to be transmitted to base station 1 .

Step 302: MME sends "MBMS Information Request" to the target base station.

As mentioned above, the message may include the identity of the destination base station 2, the identity of the source base station 1, and frequency information. The MBMS information request can be a currently defined message, or a new user-defined message.

Step 303: Base station 2 sends "MBMS information response" to MME.

The message includes frequency information and an SAI list corresponding to the frequency. The message includes the identity of the destination base station and the identity of the source base station.

The MBMS information response can be a currently defined message or a newly defined message.

Wherein, the SAI list corresponding to the frequency is all SAIs corresponding to the cell on the frequency on the base station 2 .

Step 304: MME sends "MBMS Information Response" to base station 1. The message includes frequency information, an SAI list corresponding to the frequency, and the message includes a destination base station identifier and a source base station identifier.

Step 305: Base station 1 receives the message, saves the SAI list corresponding to the frequency, and broadcasts the frequency and the corresponding SAI list on the broadcast channel.

Embodiment 2 describes that through the S1 interface, the base station requests to obtain the SAI list corresponding to all frequencies on the neighboring base station, and the neighboring base station sends the SAIs corresponding to all the frequencies on the base station to the requesting base station. As shown in Figure 4. The method may include the steps of:

Step 401: Base station 1 sends a message "MBMS information request" to MME, requesting to obtain the SAI list corresponding to all frequencies of adjacent base station 2.

The base station 1 can obtain the cell identifier and the frequency of the cell on the adjacent base station through the automatic neighbor cell establishment process, and discover a new cell. The process is as follows: the serving cell of the UE is the cell above the base station 1, the UE detects the information of the surrounding cells, and sends the detected physical cell identities of the surrounding cells to the serving cell. If the information of the cell corresponding to the physical cell ID is not stored in base station 1, the serving cell sends a message to the UE, requesting the UE to report the specific information of the adjacent cell, and the UE obtains the cell ID of the adjacent cell by receiving the broadcast information of the adjacent cell, The cell ID includes the ID of the base station where the cell is located and the frequency information of the cell. The UE reports the above information to the serving cell, and the serving cell stores the information. Through the above manner, new neighbor cells can be found. If the base station 2 where the newly discovered neighboring cell is located is a newly discovered neighboring base station, base station 1 sends an "MBMS information request" to the MME, requesting to obtain all frequencies on base station 2 and their corresponding SAI lists.

Wherein, the MBMS information request may be an existing message or a custom message. The message includes the identification of base station 1, the identification of base station 2 and an indication information, the indication information is used to indicate the destination base station 2, and the base station 1 wants to obtain all the frequencies on the destination base station 2 and their corresponding SAI lists. Specifically, the indication information may be explicit indication information, implicit indication information, or just a message name.

Step 402: MME sends "MBMS Information Request" to the target base station.

As mentioned above, the message includes the identity of the target base station 2, the identity of the source base station 1, and indication information, which are used to indicate that all frequencies of cells on the target base station and their corresponding SAI lists are required to be obtained.

The MBMS information request can be a currently defined message or a newly defined message.

Step 403: Base station 2 sends "MBMS information response" to MME.

The message includes frequency information and an SAI list corresponding to the frequency. The message includes the identity of the destination base station and the identity of the source base station.

The MBMS information response can be a currently defined message or a newly defined message.

Because the target base station may have multiple cells and multiple frequencies, the response message includes all frequencies and the SAI list corresponding to the frequencies.

The SAI list corresponding to the frequency is all the SAIs corresponding to the cell on the frequency on the base station 2 .

Step 404: MME sends "MBMS Information Response" to base station 1. The message includes frequency information, an SAI list corresponding to the frequency, and the message includes a destination base station identifier and a source base station identifier.

Step 405: Base station 1 receives the message, saves the SAI list corresponding to the frequency, and broadcasts all frequencies acquired by base station 1 and the corresponding SAI list on the broadcast channel.

If base station 2 and base station 1 have the same frequency, the SAI corresponding to the same frequency does not need to be told to base station 1, but since base station 2 does not know whether base station 1 has the same frequency as itself, base station 2 puts all frequencies and frequencies corresponding to The SAIs are all transmitted to base station 1, and after receiving them, base station 1 can discard the SAI corresponding to the same frequency.

For the frequency and SAI list sent by the adjacent base station received by the base station, if there are cells on multiple base stations using the same frequency, base station 1 will broadcast the frequency and all the SAI lists corresponding to it, and all the SAI lists refer to A set of SAIs corresponding to all neighboring cells of the same frequency is used.

As for the frequency and SAI list of the local cell, it is still the same as the existing broadcasting method, only broadcasting the frequency of the local cell and the corresponding SAI list of the local cell.

Embodiment 3 describes that through the S1 interface, the base station sends the SAIs corresponding to all its frequencies to neighboring base stations, and the neighboring base station sends the SAIs corresponding to all its frequencies to the requesting base station. As shown in Figure 5. The method may include the steps of:

Step 501: Base station 1 sends a message "MBMS information request" to MME, requesting to obtain the SAI lists corresponding to all frequencies of adjacent base station 2.

The base station 1 can obtain the cell identifier and the frequency of the cell on the adjacent base station through the automatic neighbor cell establishment process, and discover a new cell. The process is as follows: the serving cell of the UE is the cell above the base station 1, the UE detects the information of the surrounding cells, and sends the detected physical cell identities of the surrounding cells to the serving cell. If the information of the cell corresponding to the physical cell ID is not stored in base station 1, the serving cell sends a message to the UE, requesting the UE to report the specific information of the adjacent cell, and the UE obtains the cell ID of the adjacent cell by receiving the broadcast information of the adjacent cell, The cell ID includes the ID of the base station where the cell is located and the frequency information of the cell. The UE reports the above information to the serving cell, and the serving cell stores the information. Through the above manner, new neighbor cells can be found. If base station 2 where the newly discovered neighboring cell is located is a newly discovered neighboring base station, base station 1 sends an "MBMS information request" to the MME, requesting to obtain all frequencies on base station 2 and their corresponding SAI lists.

Wherein, the MBMS information request may be an existing message or a custom message. Different from the second embodiment, base station 1 sends all its own frequencies and their corresponding SAI list to base station 2 while requesting the frequency and SAI list from base station 2 through the S1 interface.

Specifically, the MBMS information request message includes the identity of the base station 2 and indication information, the indication information is used to indicate the destination base station 2, and the base station 1 wants to obtain all frequencies on the destination base station 2 and their corresponding SAI lists. If the message name or other information can already indicate this information, the displayed indication information may not be required, that is, the indication information may be explicit indication information, implicit indication information, or the message name itself.

In addition, in this embodiment, the MBMS information request message also includes all the frequencies of the base station 1 and the SAI list corresponding to the frequencies. If base station 2 and base station 1 have the same frequency, the SAI corresponding to the same frequency does not need to be told to the other party, but since base station 1 does not know whether base station 2 has the same frequency as itself, base station 1 sends all frequencies and SAI corresponding to the frequency Both are transmitted to the base station 2, and the base station 2 can discard the SAI corresponding to the same frequency after receiving it.

Step 502: MME sends "MBMS Information Request" to the target base station.

As mentioned above, the message includes the identity of the destination base station, the identity of the source base station 1, indication information, the frequency on the base station 1, and the SAI corresponding to the frequency.

The MBMS information request can be a currently defined message, or a new user-defined message.

Step 503: Base station 2 sends "MBMS information response" to MME.

The message contains frequency information, and the SAI list corresponding to the frequency. The message includes the identity of the destination base station and the identity of the source base station.

The MBMS information response can be a currently defined message, or a custom new message.

Because the target base station may have multiple cells and multiple frequencies, the response message includes multiple frequencies and the SAI list corresponding to the frequency. The SAI list corresponding to the frequency is all SAIs corresponding to the cell on the frequency on the base station 2 .

If base station 2 and base station 1 have the same frequency, from the MBMS information request, base station 2 already knows that base station 1 has the same frequency as itself, and in the response message, base station 2 can only include the frequency different from base station 1 and the corresponding SAI. Alternatively, base station 2 includes all frequencies and SAIs, and base station 1 may discard the SAI corresponding to the same frequency after receiving the MBMS information response.

Step 504: MME sends "MBMS Information Response" to base station 1. The message includes frequency information, an SAI list corresponding to the frequency, and the message includes a destination base station identifier and a source base station identifier.

Step 505: Base station 1 receives the message, saves the SAI list corresponding to the frequency, and broadcasts the frequency and the corresponding SAI list on the broadcast channel.

If cells on multiple base stations use the same frequency, base station 1 broadcasts the frequency and all corresponding SAI lists. The all SAI lists refer to the set of SAIs corresponding to all neighboring cells using the same frequency.

As for the frequency and SAI list of the local cell, it is still the same as the existing broadcasting method, only broadcasting the frequency of the local cell and the corresponding SAI list of the local cell.

In the third embodiment above, when base station 1 and base station 2 send their own SAI lists to each other, they do so in frequency units, that is, all frequencies in the base station and their corresponding SAI lists are sent. In fact, the frequency and the SAI list can also be sent in units of cells, and the following embodiments will introduce this method in detail.

Embodiment 4 describes that the base station sends the SAI corresponding to its own cell to the neighboring base station through the S1 interface, and the neighboring base station sends the SAI corresponding to its own cell to the requesting base station. As shown in Figure 6. The method may include the steps of:

Step 601: Base station 1 sends a message "MBMS information request" to MME, requesting to obtain the frequencies and SAI lists of all cells in neighboring base station 2.

The base station 1 can obtain the cell ID and the frequency of the cell on the adjacent base station through the automatic neighbor cell establishment process, and discover a new cell. The process is as follows: the serving cell of the UE is the cell above the base station 1, the UE detects the information of the surrounding cells, and sends the detected physical cell identities of the surrounding cells to the serving cell. If the information of the cell corresponding to the physical cell ID is not stored in base station 1, the serving cell sends a message to the UE, requesting the UE to report the specific information of the adjacent cell, and the UE obtains the cell ID of the adjacent cell by receiving the broadcast information of the adjacent cell, The cell ID includes the ID of the base station where the cell is located and the frequency information of the cell. The UE reports the above information to the serving cell, and the serving cell stores the information. Through the above manner, new neighbor cells can be found. If the base station 2 where the newly discovered neighboring cell is located is a newly discovered neighboring base station, the base station 1 sends an "MBMS information request" to the MME, requesting to obtain the frequencies and SAI lists of all cells on the base station 2.

Wherein, the MBMS information request may be an existing message or a custom message.

Specifically, the MBMS information request message includes the identity of base station 2 and indication information. The indication information is used to indicate the target base station. Base station 1 wants to obtain the frequencies of all cells on the target base station and their corresponding SAI lists. If the message name or other information can already indicate this information, the displayed indication information may not be required, that is, the indication information may be explicit indication information, implicit indication information, or the message name itself.

In addition, similar to the third embodiment, the MBMS information request message also includes all frequencies of the base station 1 and the SAI list corresponding to the frequencies. The only difference is that the format of the carrying frequency and the SAI list are different. In this embodiment, the cell information is carried in units of cells, and the cell information includes the frequency of the cell and the corresponding SAI list. For this method, the MBMS information request message can also be used to request other information of the cell.

Step 602: MME sends "MBMS Information Request" to the target base station.

The message includes the identity of the target base station, the identity of the source base station 1, indication information and information about the cells on the base station 1.

The MBMS information request can be a currently defined message or a newly defined message. The target base station identifier in the message is the identifier of base station 2 .

Step 603: Base station 2 sends "MBMS information response" to MME.

The message includes the information of all the cells on the base station 2, and the information of the cells includes the frequency of the cells, the SAI list and other information. The message includes the identity of the destination base station and the identity of the source base station.

The MBMS information response can be a currently defined message or a newly defined message.

Step 604: MME sends "MBMS Information Response" to base station 1. The message includes cell information on the base station 2, and the cell information includes cell frequency, SAI list and other information. The message includes the identity of the destination base station and the identity of the source base station.

Step 605: Base station 1 receives the message and saves the cell information. According to the frequency, find the SAI list corresponding to a certain frequency. And broadcast all frequencies and the corresponding SAI list on the broadcast channel of the serving cell. Or base station 1 receives the message, saves the cell information of base station 2, and the serving cell of base station 1 broadcasts neighboring cells and corresponding frequency and SAI list on its broadcast channel.

If base station 2 and base station 1 have the same frequency, the SAI corresponding to the same frequency does not need to be told to base station 1, but since base station 2 does not know whether base station 1 has the same frequency as itself, base station 2 puts all frequencies and frequencies corresponding to The SAIs are all transmitted to base station 1, and after receiving them, base station 1 can discard the SAI corresponding to the same frequency.

For the frequency and SAI list of the cell sent by the adjacent base station received by the base station, if there are multiple base stations with the same frequency used by the cell, base station 1 will broadcast the frequency and all the SAI lists corresponding to it. The SAI list refers to a set of SAIs corresponding to all neighboring cells using the same frequency.

As for the frequency and SAI list of the local cell, it is still the same as the existing broadcasting method, only broadcasting the frequency of the local cell and the corresponding SAI list of the local cell.

Or, for the cell information received by the base station and sent by the adjacent base station 2, the information of the cell on the base station 2 is stored, and the serving cell on the base station 1 all stores the information of the adjacent cell, including the physical layer identifier of the adjacent cell, and the unique identifier of the cell and other information, which is obtained through the ANR process. If through step 605, the cell of base station 1 obtains the specific information of neighboring cells, and the frequency of a certain serving cell on base station 1 is different from that of its neighboring cells, the serving cell of base station 1 broadcasts on its broadcast channel Frequency and SAI list of neighboring cells.

As above, it is the method of obtaining the SAI list information of neighboring base stations by using the S1 interface provided in the present invention. As mentioned above, for a neighboring base station with an X2 interface, the SAI list information of the neighboring base station can also be obtained through the X2 interface. The following two embodiments give specific implementation methods.

Embodiment 5 describes obtaining the service area indication SAI list of adjacent frequencies through the X2 interface, as shown in FIG. 7 . The method may include the steps of:

Step 701: Base station 1 sends a message "MBMS information request" to base station 2, requesting to obtain the SAI list corresponding to all frequencies of adjacent base station 2.

The base station 1 can obtain the cell identifier and the frequency of the cell on the adjacent base station through the automatic neighbor cell establishment process, and discover a new cell. The process is as follows: the serving cell of the UE is the cell above the base station 1, the UE detects the information of the surrounding cells, and sends the detected physical cell identities of the surrounding cells to the serving cell. If the information of the cell corresponding to the physical cell ID is not stored in base station 1, the serving cell sends a message to the UE, requesting the UE to report the specific information of the adjacent cell, and the UE obtains the cell ID of the adjacent cell by receiving the broadcast information of the adjacent cell, The cell ID includes the ID of the base station where the cell is located and the frequency information of the cell. The UE reports the above information to the serving cell, and the serving cell stores the information. Through the above manner, new neighbor cells can be found. If the base station 2 where the newly discovered neighboring cell is located is a newly discovered neighboring base station, base station 1 sends an "MBMS information request" to base station 2, requesting to obtain all frequencies on base station 2 and their corresponding SAI lists.

Wherein, the MBMS information request may be an existing message or a custom message.

The message includes the identification of base station 1, the identification of base station 2 and an indication information, the indication information is used to indicate the destination base station 2, and the base station 1 wants to obtain all the frequencies on the destination base station 2 and their corresponding SAI lists.

Or the MBMS information request includes the identifier of base station 1, the identifier of base station 2, and frequency information. The frequency information indicates that the base station 1 wants to obtain the SAI list corresponding to the frequency on the target base station 2 .

Step 702: Base station 2 sends "MBMS information response" to base station 1.

In this embodiment, when base station 2 feeds back the frequency and SAI list to base station 1, the feedback is performed in frequency units, that is, the message includes each frequency of base station 2 and the SAI list corresponding to each frequency, or includes the frequency and SAI list requested by base station 1. The corresponding SAI list is not fed back in units of cells, so that if multiple cells have the same SAI, the SAI is not transmitted multiple times. Thereby reducing the amount of transmitted data and saving system resources.

The MBMS information response can be a currently defined message or a newly defined message.

Because the target base station may have multiple cells and multiple frequencies, the response message includes multiple frequencies and the SAI list corresponding to the frequencies.

Or the destination response message includes the frequency requested by base station 1 and/or its corresponding SAI list.

The SAI list corresponding to the frequency is all the SAIs corresponding to the cell on the frequency on the base station 2 .

Step 703: Base station 1 receives the message, saves the SAI list corresponding to the frequency, and broadcasts the frequency and the corresponding SAI list on the broadcast channel.

If base station 2 and base station 1 have the same frequency, the SAI corresponding to the same frequency does not need to be told to base station 1, but since base station 2 does not know whether base station 1 has the same frequency as itself, base station 2 puts all frequencies and frequencies corresponding to The SAIs are all transmitted to base station 1, and after receiving them, base station 1 can discard the SAI corresponding to the same frequency.

For the frequency and SAI list received by the adjacent base station received by the base station, if there are multiple base stations with the same frequency used by the cells, base station 1 will broadcast the frequency and all the corresponding SAI lists, and all the SAI lists It refers to the set of SAIs corresponding to all neighboring cells using the same frequency.

As for the frequency and SAI list of the local cell, it is still the same as the existing broadcasting method, only broadcasting the frequency of the local cell and the corresponding SAI list of the local cell.

Embodiment 6 describes obtaining the service area indicator SAI list of adjacent frequencies through the X2 interface, and actively sending its own frequency and the corresponding SAI list. As shown in Figure 8. The method may include the steps of:

Step 801: Base station 1 sends a message "MBMS information request" to base station 2, requesting to obtain the SAI lists corresponding to all frequencies of adjacent base station 2, and sends its own frequency and SAI list to base station 2 at the same time.

The base station 1 can obtain the cell identifier and the frequency of the cell on the adjacent base station through the automatic neighbor cell establishment process, and discover a new cell. The process is as follows: the serving cell of the UE is the cell above the base station 1, the UE detects the information of the surrounding cells, and sends the detected physical cell identities of the surrounding cells to the serving cell. If the information of the cell corresponding to the physical cell ID is not stored in base station 1, the serving cell sends a message to the UE, requesting the UE to report the specific information of the adjacent cell, and the UE obtains the cell ID of the adjacent cell by receiving the broadcast information of the adjacent cell, The cell ID includes the ID of the base station where the cell is located and the frequency information of the cell. The UE reports the above information to the serving cell, and the serving cell stores the information. Through the above manner, new neighbor cells can be found. If base station 2 where the newly discovered neighboring cell is located is a newly discovered neighboring base station, base station 1 sends an "MBMS information request" to base station 2, requesting to obtain all frequencies on base station 2 and their corresponding SAI lists.

Wherein, the MBMS information request may be an existing message or a custom message. Different from Embodiment 5, base station 1 sends all its own frequencies and their corresponding SAI list to base station 2 while requesting the frequency and SAI list from base station 2 through the S1 interface.

Specifically, the MBMS information request message includes the identity of the base station 2 and indication information, the indication information is used to indicate the destination base station 2, and the base station 1 wants to obtain all frequencies on the destination base station 2 and their corresponding SAI lists. If the message name or other information can already indicate this information, the displayed indication information may not be required, that is, the indication information may be explicit indication information, implicit indication information, or the message name itself.

In addition, in this embodiment, the MBMS information request information also includes all frequencies of the base station 1 and the SAI list corresponding to the frequencies. And the corresponding information is organized in units of frequencies, that is, each frequency of the base station 1 and the SAI list corresponding to each frequency are sent, without sending the cell-related information in the base station 1 .

Further, when the cell above base station 1 changes the SAI list, and the SAI list corresponding to its frequency also changes, base station 1 may also trigger the message of step 801, that is, the message of 801 is also used in the process of updating the SAI list. At this time, base station 2 also does not need to feed back all the frequencies and SAI lists of base station 2 if the SAI corresponding to the frequency does not change. If there is a change, it can feed back a new SAI list in the response message.

Step 802: Base station 2 sends "MBMS information response" to base station 1.

The processing of this step is the same as the aforementioned step 702 . The MBMS information response message includes frequency information and the SAI list corresponding to the frequency.

The MBMS information response can be a currently defined message or a newly defined message.

Because the target base station may have multiple cells, corresponding to one frequency or multiple frequencies, the response message includes multiple frequencies and the SAI list corresponding to the frequency.

The SAI list corresponding to the frequency is all the SAIs corresponding to the cell on the frequency on the base station 2 .

Step 803: Base station 1 receives the message, saves the SAI list corresponding to the frequency, and broadcasts the frequency and the corresponding SAI list on the broadcast channel.

If base station 2 and base station 1 have the same frequency, the SAI corresponding to the same frequency does not need to be told to base station 1, but since base station 2 does not know whether base station 1 has the same frequency as itself, base station 2 puts all frequencies and frequencies corresponding to The SAIs are all transmitted to base station 1, and after receiving them, base station 1 can discard the SAI corresponding to the same frequency.

For the frequency and SAI list received by the adjacent base station received by the base station, if there are multiple base stations with the same frequency used by the cells, base station 1 will broadcast the frequency and all the corresponding SAI lists, and all the SAI lists It refers to the set of SAIs corresponding to all neighboring cells using the same frequency.

As for the frequency and SAI list of the local cell, it is still the same as the existing broadcasting method, only broadcasting the frequency of the local cell and the corresponding SAI list of the local cell.

In addition, the serving cell may also acquire the SAI list of adjacent frequencies through the interaction between the base station and the UE. Specifically, the UE may be instructed to acquire the frequency and SAI list of the newly discovered neighboring cell during the automatic neighbor cell establishment process, and send the frequency and SAI list to the serving cell. Specifically, the specific implementation manner is illustrated through the seventh embodiment.

Embodiment 7 describes obtaining the SAI list of adjacent frequencies through the air interface, as shown in FIG. 9 . The method may include the steps of:

Step 901: The serving cell of the UE is the cell above the base station 1, the UE detects the information of the surrounding cells, and sends the detected physical cell identities of the surrounding cells to the serving cell.

Step 902: If the information of the cell corresponding to the physical cell identifier is not stored in the base station 1, the serving cell sends a message to the UE, requesting the UE to report the specific information of the adjacent cell, including the frequency and the corresponding SAI list

Step 903: The UE obtains the cell information of the neighboring cell by receiving the broadcast information of the neighboring cell, specifically including the cell identifier, frequency information, and the SAI list of the cell.

Wherein, the cell identifier includes the identifier of the base station where the cell is located. The UE reports the above cell information to the serving cell, and the serving cell stores the information. And the frequencies of adjacent cells and the corresponding SAI are broadcast on the air interface.

Step 904: the base station saves and broadcasts the received frequency and its corresponding SAI.

If cells on multiple base stations use the same frequency, base station 1 broadcasts the frequency and all corresponding SAI lists. The all SAI lists refer to the set of SAIs corresponding to all neighboring cells using the same frequency.

Through the method of Embodiment 7, when a new neighbor cell is discovered during the automatic neighbor cell establishment process, the UE can obtain the frequency and SAI list of the new neighbor cell, and send it to the base station where the serving cell is located, and the base station broadcasts it to all UEs in the cell . In this way, only one UE needs to be used to receive the broadcast information of the neighbor cell when a new neighbor cell is discovered, instead of all the UEs having to receive the broadcast information of the neighbor cell, and the complexity of UE processing can also be reduced, so that the base station obtains and broadcasts the broadcast information of the neighbor cell. Frequency and SAI lists to ensure continuous transmission of MBMS services.

Embodiment 8 describes that the base station listens to the signals of surrounding cells to obtain the service area indication SAI list of adjacent frequencies. The method may include the following steps:

Step 1001: the base station listens to the broadcast information of neighboring cells, including the frequency and SAI of neighboring cells.

For the home base station, the broadcast information of the neighboring cell can be listened to. For such base stations that can listen to the broadcast information of neighboring cells, the frequency and SAI list of neighboring cells can be obtained over the air interface.

Step 1002: the base station stores the adjacent frequencies and the SAI corresponding to the frequencies, and broadcasts the adjacent frequencies and the SAI corresponding to the frequencies on the air interface.

The foregoing is the method for supporting continuous transmission of MBMS services provided in the present invention. By applying the above method, the base station can obtain the frequency and SAI list of neighboring cells and broadcast them to UEs in the cell, without requiring UEs to monitor the SAI lists of neighboring cells, thereby reducing the complexity of UE processing. At the same time, when the base station transmits the frequency and SAI list through the X2 interface, the transmission is performed in units of frequency, which reduces the amount of data exchanged between base stations and saves system resources.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the present invention. within the scope of protection.

Claims (21)

1. a method of supporting to broadcast data continuity is characterized in that, this method comprises:

For the residential quarter of the arbitrary base station A in the system, when finding new adjacent area, described base station A is by MME or directly to the SAI tabulation of the frequency correspondence of the described new adjacent area of B acquisition request, base station at place, described new adjacent area;

Described base station B is by MME or directly send the frequency of described new adjacent area and corresponding SAI tabulation to described base station A, and the residential quarter of described base station A is in the frequency of the described new adjacent area of broadcast channel broadcasting and corresponding SAI tabulation.

2. method according to claim 1 is characterized in that, the mode that described base station A asks the SAI of the frequency correspondence of described new adjacent area to tabulate is:

Described base station A sends the MBMS information request message to described base station B, and carries the sign of base station B and the frequency of described new adjacent area, is used to indicate the SAI tabulation that will obtain the frequency correspondence of new adjacent area among the described base station B.

3. method according to claim 2 is characterized in that, described MBMS information request message is existing message or self-defined message.

4. according to arbitrary described method in the claim 1 to 3, it is characterized in that the SAI tabulation of described frequency correspondence is: all SAI of the residential quarter correspondence on the corresponding frequencies.

5. a method of supporting to broadcast data continuity is characterized in that, this method comprises:

For the arbitrary base station A in the system, base station A is by MME all frequencies in the adjacent base station B acquisition request base station B and corresponding SAI tabulation thereof;

Described base station B sends all frequencies and corresponding SAI tabulation thereof, the residential quarter of described base station A each frequency that broadcast base station A receives on broadcast channel and corresponding SAI tabulation thereof among the described base station B by MME to described base station A.

6. method according to claim 5 is characterized in that, the SAI tabulation of all frequency correspondences of described base station B is: all SAI of the residential quarter correspondence among the described base station B on each frequency;

Each frequency that described base station A receives and corresponding SAI tabulation thereof are: all frequencies of the adjacent base station of described base station A and each frequency are in the SAI of all adjacent base station correspondences list collection.

7. method according to claim 5 is characterized in that, in the described SAI tabulation of described base station A acquisition request, sends all frequencies of described base station A and corresponding SAI tabulation thereof by MME to described base station B.

8. method according to claim 7 is characterized in that, after the request that receives described base station A transmission, before the SAI of all frequencies that send described base station B to described base station A and correspondence thereof tabulation, this method further comprises described base station B by MME:

After described base station B receives all frequencies and corresponding SAI tabulation thereof of described base station A, judge whether base station A and base station B exist same frequency and corresponding SAI tabulation, if, then when sending the SAI tabulation of described all frequencies and correspondence thereof to described base station A, only send the frequency different with base station A and corresponding SAI tabulation thereof.

9. method according to claim 5, it is characterized in that, after described base station B sends the SAI tabulation of described all frequencies and correspondence thereof, this method further comprises: after described base station A receives all frequencies and corresponding SAI tabulation thereof of described base station B, judge whether base station A and base station B exist same frequency, if then abandon this same frequency of described base station B transmission and corresponding SAI tabulation thereof.

10. method according to claim 7 is characterized in that, described base station A sends all frequencies of described base station A and corresponding SAI tabulation is by MME to base station B: the information of each residential quarter among the described base station A is sent to described base station B; The information of described residential quarter comprises the frequency of residential quarter and corresponding SAI tabulation;

Described base station B by MME to the SAI tabulation that described base station A sends described all frequencies and correspondence thereof is: described base station B sends the information of each residential quarter among the described base station B to described base station A by MME; The information of described residential quarter comprises the frequency of residential quarter and corresponding SAI tabulation.

11., it is characterized in that the mode that described base station A described all frequencies of request and corresponding SAI thereof tabulate is according to arbitrary described method in the claim 5 to 10:

Described base station A sends the MBMS information request message of carrying indication information to described base station B, and described indication information is used to indicate all frequencies that will obtain described base station B and corresponding SAI tabulation thereof.

12. method according to claim 11 is characterized in that, described MBMS information request message is existing message or self-defined message; Described indication information is explicit indication information, the indication information of implicit expression or the title of described MBMS information request message.

13. a method of supporting to broadcast data continuity is characterized in that, this method comprises:

For the arbitrary base station A in the system, described base station A is directly to frequency and the SAI tabulation of the residential quarter correspondence of the described base station B of adjacent base station B acquisition request;

Described base station B directly sends frequency and the SAI tabulation of the residential quarter correspondence of described base station B to described base station A;

The residential quarter of described base station A is in the frequency of broadcast channel broadcasting adjacent cell and corresponding SAI tabulation thereof, and perhaps the residential quarter of base station A is in each frequency of the described base station A reception of broadcast channel broadcasting and corresponding SAI tabulation thereof.

14. method according to claim 13 is characterized in that, in the described SAI tabulation of described base station A acquisition request, directly sends frequency and the SAI tabulation of the residential quarter correspondence of described base station A to described base station B.

15. method according to claim 14 is characterized in that, before frequency from described base station B to described base station A and SAI tabulation after the request that receives described base station A transmission, in the residential quarter correspondence that sends, this method further comprises described base station B by MME:

After described base station B receives the frequency of residential quarter correspondence and SAI tabulation of described base station A, judge whether base station A and base station B exist same frequency and corresponding SAI tabulation, if, then when the frequency of the residential quarter correspondence that sends described base station B to described base station A and SAI tabulation, only send the residential quarter of the frequency different with base station A and corresponding SAI thereof and tabulate.

16. method according to claim 13, it is characterized in that, after described base station B sends the residential quarter and corresponding frequency and SAI tabulation thereof of described base station B, this method further comprises: after described base station A receives the frequency of residential quarter correspondence and SAI tabulation of described base station B, judge whether base station A and base station B exist same frequency and corresponding SAI tabulation, if then abandon this same frequency of described base station B transmission and corresponding SAI tabulation thereof.

17., it is characterized in that described base station A asks the frequency of residential quarter correspondence of described base station B and the mode of SAI tabulation to be according to arbitrary described method in the claim 13 to 16:

Described base station A sends the MBMS information request message of carrying indication information to described base station B, and described indication information is used to indicate frequency and the SAI tabulation of the residential quarter correspondence that will obtain described base station B.

18. method according to claim 17 is characterized in that, described MBMS information request message is existing message or self-defined message; Described indication information is explicit indication information, the indication information of implicit expression or the title of described MBMS information request message.

19. method according to claim 17, it is characterized in that, this method further comprises: when the SAI list update of the residential quarter of described base station A, described base station A directly sends described MBMS information request message to its adjacent base station, and in this message, carry base station A the residential quarter correspondence frequency and upgrade after the SAI tabulation;

Described adjacent base station receives described MBMS information request message, if the SAI of the residential quarter of described adjacent base station tabulation has renewal, then described adjacent base station feed back to described base station A described adjacent base station the residential quarter correspondence frequency and upgrade after the SAI tabulation.

20. a method of supporting to broadcast data continuity is characterized in that, this method comprises:

UE detects the information of adjacent residential quarter, and the Physical Cell Identifier of detected adjacent residential quarter C is sent to the base station at UE Serving cell place;

When described base station determines that according to the report of described UE described adjacent residential quarter C is new adjacent area, the information that described base station notice UE reports adjacent residential quarter C;

Described UE receives cell ID, frequency information and the corresponding SAI tabulation thereof of described adjacent residential quarter C by the broadcast channel of described adjacent residential quarter C, and reports described base station;

Described base station is in the frequency of the described adjacent residential quarter C of broadcast channel broadcasting and corresponding SAI tabulation thereof.

21. a method of supporting to broadcast data continuity is characterized in that, this method comprises:

The broadcast channel of one base station in adjacent residential quarter receives the frequency of adjacent residential quarter and corresponding SAI tabulation thereof;

Preserve and the frequency of broadcast reception on broadcast channel and corresponding SAI tabulation thereof described base station.

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