CN101505459A - Method for solving UE mobility in RRC connection mode - Google Patents

Abstract

A method for notifying user equipment UE of PTM transmission bearer, comprising steps: CRNC determines that the bearer mode of MBMS service in a controlled cell is PTM; CRNC sends MBMS channel reconfiguration to all UEs in the cell. The invention solves the mobile problem when UE using MBMS service is in connection mode in the existing mobile communication system. Through the signaling flow provided by the present invention, the data loss of UE moving between cells is reduced. Inform the UE in time whether the new cell is a tracking area or a non-tracking area. The signaling transmission on the air interface is reduced, wireless resources are saved, and the efficiency of the system for providing MBMS services is improved. And with backward compatibility for modifications to existing messages.

Description

Method for solving UE movement in RRC connection mode

technical field

The invention relates to a method for solving UE movement in RRC connection mode in a wideband code division multiple access (hereinafter referred to as WCDMA) mobile communication system.

Background technique

Multimedia Broadcast and Multicast Service (hereinafter referred to as MBMS) is a new service being standardized by the Third Generation Partnership Project (hereinafter referred to as 3GPP). The MBMS service is a one-way point-to-multipoint service. The biggest feature of this service is that it can effectively utilize wireless resources and network resources.

Figure 1 describes the system structure of MBMS. The MBMS network structure is based on the general packet radio service (referred to as GPRS) core network, and a new network unit is added. The following is a description of the MBMS system structure in FIG. 1 .

101 The broadcast and multicast service center (BM-SC for short) is the service control center of the MBMS system. 102 Gateway GPRS Support Node (GGSN for short) and 103 Serving GPRS Support Node (SGSN for short) constitute a transmission network for MBMS services and provide routes for data transmission. 104 The UMTS Terrestrial Radio Access Network (abbreviated as UTRAN) provides radio resources for MBMS services on the air interface. 105 User equipment (UE for short) is a terminal device for receiving data. 106 The Home Location Register (HLR for short) saves data related to the user and can provide services such as user authentication. 107Uu is a wireless interface, and 108Iu is an interface between an access network and a core network. In the figure, other parts except the UE constitute an infrastructure domain (abbreviated as IF). The radio resources used by MBMS services are not dedicated to users, but shared by all users of this service.

When the MBMS service is not introduced in the WCDMA system, the UE in CELL_FACH and CELL_PCH performs cell reselection and moves from one cell to another, and then sends a "cell update" message to the new cell. When the UE is in the CELL_DCH state, when the UTRAN decides to require the UE to add radio links, delete radio links, and combine the addition and deletion of radio links to the active set of the connection according to the measurement report of the UE, the UTRAN sends "activation set update" message to the UE.

There are no relevant parameters of MBMS services in the message of the existing cell update process. After the UE in CELL_FACH and CELL_PCH performs cell reselection and moves from one cell to another, it does not know whether the new cell is a tracking area or a non-tracking area and whether the new cell is a tracking area or a wireless network. If the related parameters of the bearer (hereinafter referred to as RB) are waiting to receive a broadcast or paging message, data loss will inevitably occur. When the UE in CELL_DCH executes the active set update process, not only the same problem exists, but also the problem of which cell or cells in the active set the UE receives the MBMS service from. Therefore, the existing norms cannot solve the mobile problem of users receiving MBMS services in the mobile communication system.

Contents of the invention

The purpose of the present invention is to provide a method for UE receiving MBMS service in RRC connection mode to move from one cell to another cell. The moving process provided by the invention can reduce the data loss when the user moves between different cells, and inform the UE whether the new cell is in the tracking area or the non-tracking area.

In order to achieve the above object, a method for notifying user equipment UE of PTM transmission bearer, comprising steps:

CRNC decides that the bearer mode of the MBMS service in the controlled cell is PTM;

CRNC sends MBMS channel reconfiguration to all UEs in the cell.

The invention solves the mobile problem when UE using MBMS service is in connection mode in the existing mobile communication system. Through the signaling flow provided by the present invention, the data loss of UE moving between cells is reduced. Inform the UE in time whether the new cell is a tracking area or a non-tracking area. The signaling transmission on the air interface is reduced, wireless resources are saved, and the efficiency of the system for providing MBMS services is improved. And with backward compatibility for modifications to existing messages.

Description of drawings

Fig. 1 is the logic network equipment figure of MBMS business;

Fig. 2 is the signaling flow of a UE receiving MBMS services in the CELL_FACH and CELL_PCH states moving under the same SGSN;

Fig. 3 is the signaling flow of UE receiving MBMS service in CELL_DCH moving under the same RNC;

Fig. 4 is the signaling flow of UE moving between different RNCs while receiving MBMS service and other non-MBMS services in CELL_DCH;

FIG. 5 is a signaling flow for a UE that only receives MBMS services on the CELL_DCH and moves between different RNCs.

Detailed ways

(1) The present invention provides the method that solves the mobile UE that is receiving MBMS service in CELL_FACH and CELL_PCH, and this method comprises the following steps:

a) After the UE receiving MBMS services on CELL_FACH and CELL_PCH moves from one cell to another, it sends a "cell update" message to the new cell. This message adds an information element: MBMS Service ID.

b) If the UE moves between cells of different radio network controllers (hereinafter referred to as RNC), the serving RNC (hereinafter referred to as SRNC) will send the "cell update" message to the RNC of the target cell after receiving the "cell update" message from the UE that needs to receive MBMS services "MBMS Connection Request" message. The "MBMS Connection Request" message includes: MBMS Service ID, UE Identity, Cell ID.

c) If the channel type of the target cell changes from point-to-point (hereinafter referred to as PTP) to point-to-multipoint (hereinafter referred to as PTM) due to the joining of the UE, the RNC sends "MBMS channel reconfiguration" to all UEs in the cell UE. The message contains information elements: MBMSService ID, MBMS RB Info, Service Area Info (such as tracking area or non-tracking area). Service Area Info is optional.

d) If b) exists, mobile RNC (hereinafter referred to as DRNC) sends a "MBMS connection response" message to SRNC, this message includes: MBMS Service ID, UEIdentity, CellID, MBMS RB Info, Service Area Info (such as tracking area or non-tracking area).

e) The RNC of the target cell sends a "cell update confirmation" message to the UE. This message adds information elements: MBMS ServiceID, MBMS RB Info, Service Area Info (such as tracking area or non-tracking area). In this way, UE can quickly obtain the information of MBMS RB and service area, so as to listen to MBMS data on the corresponding channel.

f) If the source cell where the UE is located is a tracking area, the target cell is a non-tracking area, and the UE does not receive other non-MBMS services. Release the corresponding RRC connection.

g) UE can receive MBMS data from the new cell.

h) If the UE moves between two different cells of the same RNC, steps b) and d) are unnecessary.

(2) The present invention provides the method that the UE that is in CELL_DCH and receiving MBMS service moves between two different sub-districts of the same RNC, and the method includes the following steps:

a) The UE in CELL_DCH receiving MBMS service sends a "measurement report" message to RNC (Rel99 procedure).

b) The RNC decides to perform an active set update process (the source cell and the target cell both have a radio link (hereinafter referred to as RL)) or a cell change process (the target cell is in PTM mode and the UE does not receive other non-MBMS services, or there is no real activation The set update process only changes the cell receiving the MBMS service). Because the cell list in the measurement report is arranged according to cell quality from best to worst (the first cell is the cell with the best quality), the RNC can select the best one or several cells from the active set to provide the MBMS service.

If there are multiple RLs in the active set, in order to avoid frequent changes of cells providing MBMS services, RNC can give a threshold value. When the SNR or received signal code power of a cell in the active set is higher than the threshold value of the cell that originally provided the MBMS service, the RNC changes the cell that provides the MBMS service. RNC can also add a timer, and change the cell that provides MBMS service when the value exceeds the threshold within a certain time range. If both the source cell and the target cell have RLs (for example, the UE receives other non-MBMS services), the RNC can also only change the cell providing the MBMS service each time the active set is updated.

c) If the target cell is a tracking area, when the channel type of the target cell changes from PTP (point-to-point) to PTM (point-to-multipoint) due to the joining of the UE, the RNC sends "MBMS channel reconfiguration" to the cell All UEs. The message contains information elements: MBMSService ID, MBMS RB Info, Service Area Info (such as tracking area or non-tracking area).

d) If the UE only receives MBMS services, and the target cell is a non-tracking area or a tracking area PTM mode, the RNC sends a "RB reconfiguration" or "physical channel reconfiguration" message to the UE to inform the UE whether the new cell is a tracking area or a non-tracking area Area, RB parameters, delete the RL of the source cell.

If the UE receives non-MBMS services and the target cell is in the non-tracking area or tracking area PTM mode, the RNC can also send a "RB reconfiguration" or "physical channel reconfiguration" message to the UE before establishing RL for the non-MBMS service, informing the UE of the new Whether the cell is a tracking area or a non-tracking area, and RB parameters. Reduce data loss.

Add information elements to the "RB reconfiguration" or "physical channel reconfiguration" message: MBMSService Id, MBMS RB parameters, Service area Info. These information elements are optional.

The UE completes the corresponding configuration and sends a "RB reconfiguration complete" or "physical channel reconfiguration complete" message to the RNC according to the received message.

e) If the active set is updated when the UE receives non-MBMS services or the target cell is in PTP mode, establish RL and bearer in the target cell to complete user plane synchronization.

f) If the UE receives non-MBMS services and the active set is updated or the target cell is in PTP mode, the RNC sends an "active set update" message to the UE. Information elements are added to this message: MBMS ServiceId, MBMS RB parameters, Service area Info. These information elements are optional.

The UE completes the corresponding configuration and sends an "active set update complete" message to the RNC.

g) When the RL of the source cell needs to be deleted according to the measurement report of the UE, the RL of the source cell is deleted. The UE can then receive MBMS data from the new cell.

(3) the present invention provides the solution that is in CELL_DCH and is receiving MBMS business, also has the UE of non-MBMS business to move between different RNCs simultaneously, and this method comprises the following steps:

a) The UE in CELL_DCH receiving MBMS service sends a "measurement report" message to RNC (Rel99 process).

The SRNC decides to perform an active set update procedure or a cell change procedure. The conditions for selection and execution of MBMS cells are the same as (2).

b) The SRNC sends a "MBMS Connection Request" message to the RNC of the target cell. The "MBMS Connection Request" message includes: MBMS Service ID, UE Identity, Cell ID.

c) If the target cell is a tracking area, when the channel type of the target cell changes from PTP (point-to-point) to PTM (point-to-multipoint) due to the joining of the UE, the RNC sends "MBMS channel reconfiguration" to the cell All UEs. The message contains information elements: MBMSService ID, MBMS RB Info, Service Area Info (such as tracking area or non-tracking area).

d) DRNC sends "MBMS Connection Response" message to SRNC, this message includes: MBMS ServiceID, UE Identity, Cell ID, Service Area Info, MBMS RB Info. MBMS RB Info is optional, if the target cell is in tracking area PTP mode, RB information will not be included.

e) If the target cell is a non-tracking area or a tracking area PTM mode, the RNC can send a "RB reconfiguration" or "physical channel reconfiguration" message to the UE before establishing RL for non-MBMS services, informing the UE that the new cell is a tracking area Or non-tracking area, RB parameter. Reduce data loss. The "RB reconfiguration" or "physical channel reconfiguration" message contains information elements: MBMS Service Id, MBMS RB parameters, Servicearea Info.

The UE completes the corresponding configuration and sends a "RB reconfiguration complete" or "physical channel reconfiguration complete" message to the RNC according to the received message.

f) Execute the RL and bearer establishment process on the interface of Iur (interface between SRNC and DRNC) and Iub (interface between RNC and base station subsystem), and complete the uplink and downlink synchronization of the user plane. If only the cell receiving MBMS service is changed in the active set and the target cell is in PTM mode, this step is unnecessary.

g) The SRNC sends an "Active Set Update" message to the UE. This message contains information elements: MBMSServiceId, MBMS RB parameters, Service areaInfo. If only the cell receiving MBMS service is changed in the active set and the target cell is in PTM mode, this step is unnecessary.

The UE completes the corresponding configuration and sends an "active set update complete" message to the RNC.

h) When the RL of the source cell needs to be deleted according to the measurement report of the UE, the RL of the source cell is deleted.

(4) the present invention provides the method that the UE that is in CELL_DCH and only receives MBMS business moves between different RNCs, and this method comprises the following steps:

a) The UE in CELL_DCH receiving MBMS service sends a "measurement report" message to RNC (Rel99 process).

The SRNC decides to perform an active set update procedure or a cell change procedure.

b) The SRNC sends a "MBMS Connection Request" message to the RNC of the target cell. The "MBMS Connection Request" message includes: MBMS Service ID, UE Identity, Cell ID.

c) If the target cell is a tracking area, when the channel type of the target cell changes from PTP (point-to-point) to PTM (point-to-multipoint) due to the joining of the UE, the RNC sends "MBMS channel reconfiguration" to the cell All UEs.

d) DRNC sends "MBMS Connection Response" message to SRNC, this message includes: MBMS ServiceID, UE Identity, Cell ID, Service Area Info, MBMS RB Info. MBMS RB Info is optional, if the target cell is in tracking area PTP mode, RB information will not be included.

e) If the target cell is a non-tracking area or a tracking area PTM mode, the RNC sends a "RB reconfiguration" or "physical channel reconfiguration" message to the UE to inform the UE whether the new cell is a tracking area or a non-tracking area, and RB parameters.

The UE completes the corresponding configuration and sends a "RB reconfiguration complete" or "physical channel reconfiguration complete" message to the RNC according to the received message.

f) If the target cell is in the tracking area PTP mode, execute the RL and bearer establishment process to complete the uplink and downlink synchronization of the user plane.

h) If the target cell is in tracking area PTP mode, RNC sends an "Active Set Update" message to UE. This message contains information elements: MBMS ServiceId, MBMS RBparameters, Service area Info.

The UE completes the corresponding configuration and sends an "active set update complete" message to the RNC.

g) Delete the RL of the source cell when it is necessary to delete the RL of the source cell according to the measurement report of the UE, the purpose and the RB information of the source cell.

The signaling flow of the mobile UE receiving MBMS services in CELL_FACH and CELL_PCH is shown in Figure 2:

201 After the UE receiving the MBMS service on CELL_FACH and CELL_PCH moves from one cell to another, it sends a "cell update" message to the new cell. This message adds an information element: MBMS ServiceID.

202 If the UE moves between cells of different RNCs, the SRNC sends a "MBMS Connection Request" message to the RNC of the target cell after receiving the "Cell Update" message from the UE that needs to receive the MBMS service. The "MBMS Connection Request" message includes: MBMS Service ID, UEIdentity, Cell ID.

203 When the channel type of the target cell changes from PTP (point-to-point) to PTM (point-to-multipoint) due to the joining of the UE, the RNC sends "MBMS channel reconfiguration" to all UEs in the cell.

204 If the UE moves between cells of different RNCs, the DRNC sends a "MBMS Connection Response" message to the SRNC, which contains: MBMS Service ID, UE Identity, CellID, MBMS RB Info, Service Area Info (such as tracking area or non-tracking area ).

205 RNC sends a "cell update confirmation" message to UE. This message adds information elements: MBMS Service ID, MBMS RB Info, Service Area Info (such as tracking area or non-tracking area). In this way, UE can quickly obtain MBMS RB and service area information, so as to listen to MBMS data on the corresponding channel.

206: If the source cell where the UE is located is a tracking area, the target cell is a non-tracking area, and the UE does not receive other non-MBMS services. Release the corresponding RRC connection.

207 UE can receive MBMS data from the new cell.

If the UE moves between two different cells of the same RNC, steps 202 and 204 are unnecessary.

The signaling process of UE moving between two different cells of the same RNC and receiving MBMS service in CELL_DCH is shown in Figure 3:

301 UE receiving MBMS service in CELL_DCH sends "measurement report" message to RNC (Rel99 procedure).

302 RNC decides to execute the active set update process (the source cell and the target cell have RL) or the cell change process (the target cell is in PTM mode and the UE does not receive other non-MBMS services, or only changes the cell receiving the MBMS service in the active set). RNC can choose the cell that provides MBMS service.

303 If the target cell is a tracking area, when the channel type of the target cell changes from PTP (point-to-point) to PTM (point-to-multipoint) due to the joining of the UE, the RNC sends "MBMS channel reconfiguration" to all UE.

304 If the UE only receives MBMS services, and the target cell is a non-tracking area or a tracking area PTM mode, the RNC sends a "RB reconfiguration" or "physical channel reconfiguration" message to the UE to inform the UE whether the new cell is a tracking area or a non-tracking area , RB parameter, delete the RL of the source cell.

If the UE receives non-MBMS services and the target cell is in the non-tracking area or tracking area PTM mode, the RNC sends a "RB reconfiguration" or "physical channel reconfiguration" message to the UE before establishing RL for the non-MBMS service, informing the UE of the new cell Is it a tracking area or a non-tracking area, RB parameter. Reduce data loss.

305 If step 304 exists, the UE completes the corresponding configuration and sends a "RB reconfiguration complete" or "physical channel reconfiguration complete" message to the RNC respectively according to the received message.

306 If the active set is updated when the UE receives non-MBMS services or the target cell is in PTP mode, establish RL and bearer in the target cell to complete user plane synchronization.

307 If the UE receives non-MBMS services and the active set is updated or the target cell is in PTP mode, the RNC sends an "active set update" message to the UE. Information elements are added to this message: MBMS Service Id, MBMS RB parameters, Service area Info.

308 If step 307 exists, the UE completes the corresponding configuration and sends an "active set update complete" message to the RNC.

309 When the RL of the source cell needs to be deleted according to the measurement report of the UE, delete the RL of the source cell.

310 UE can receive MBMS data from the new cell.

Figure 4 shows the signaling flow of a UE that is receiving MBMS services on CELL_DCH and also has non-MBMS services moving between different RNCs:

401 UE in CELL_DCH receiving MBMS service sends a "Measurement Report" message to RNC (Rel99 procedure).

402 The SRNC decides to perform an active set update process or a cell change process. The conditions for selection and execution of MBMS cells are the same as above.

403 The SRNC sends an "MBMS Connection Request" message to the RNC of the target cell. The "MBMS Connection Request" message includes: MBMS Service ID, UE Identity, Cell ID.

404 If the target cell is a tracking area, when the channel type of the target cell changes from PTP (point-to-point) to PTM (point-to-multipoint) due to the joining of the UE, the RNC sends "MBMS channel reconfiguration" to all UE.

405DRNC sends "MBMS Connection Response" message to SRNC, this message includes: MBMS ServiceID, UE Identity, Cell ID, Service AreaInfo, MBMS RB Info. MBMS RB Info is optional, if the target cell is in tracking area PTP mode, RB information will not be included.

406 If the target cell is a non-tracking area or a tracking area PTM mode, the RNC can send a "RB reconfiguration" or "physical channel reconfiguration" message to the UE before establishing RL for non-MBMS services, and inform the UE whether the new cell is a tracking area or a tracking area. Non-tracking area, RB parameter. Reduce data loss.

407 If step 406 exists, the UE completes the corresponding configuration and sends a "RB reconfiguration complete" or "physical channel reconfiguration complete" message to the RNC according to the received message.

408 Execute the RL and bearer establishment process on the Iur and Iub interfaces to complete the uplink and downlink synchronization of the user plane. If only the cell receiving MBMS service is changed in the active set and the target cell is in PTM mode, this step is unnecessary.

409 The SRNC sends an "Active Set Update" message to the UE. This message contains information elements: MBMSService Id, MBMS RB parameters, Service area Info. If only the cell receiving MBMS service is changed in the active set and the target cell is in PTM mode, this step is unnecessary.

410 The UE completes the corresponding configuration and sends an "active set update complete" message to the RNC. If only the cell receiving MBMS service is changed in the active set and the target cell is in PTM mode, this step is unnecessary.

411 Delete the RL of the source cell when the RL of the source cell needs to be deleted according to the measurement report of the UE. Figure 5 shows the signaling flow of a UE in CELL_DCH that only receives MBMS services and moves between different RNCs:

501 UE receiving MBMS service in CELL_DCH sends "Measurement Report" message to RNC (Rel99 procedure).

502 The SRNC decides to execute an active set update process or a cell change process.

503 The SRNC sends an "MBMS Connection Request" message to the RNC of the target cell. The "MBMS Connection Request" message includes: MBMS Service ID, UEIdentity, Cell ID.

504 If the target cell is a tracking area, when the channel type of the target cell changes from PTP (point-to-point) to PTM (point-to-multipoint) due to the joining of the UE, the RNC sends "MBMS channel reconfiguration" to all UE.

505DRNC sends "MBMS Connection Response" message to SRNC, this message includes: MBMS ServiceID, UE Identity, Cell ID, Service Area Info, MBMS RB Info. MBMS RB Info is optional, if the target cell is in tracking area PTP mode, RB information will not be included.

506 If the target cell is a non-tracking area or a tracking area PTM mode, the RNC sends a "RB reconfiguration" or "physical channel reconfiguration" message to the UE to inform the UE whether the new cell is a tracking area or a non-tracking area, and RB parameters. This message contains information elements: MBMSService Id, MBMS RB parameters, Service area Info.

507 If step 506 exists, the UE completes the corresponding configuration and sends a "RB reconfiguration complete" or "physical channel reconfiguration complete" message to the RNC according to the received message.

508 If the target cell is in the tracking area PTP mode, execute the RL and bearer establishment process to complete the uplink and downlink synchronization of the user plane.

509 If the target cell is in tracking area PTP mode, the RNC sends an "Active Set Update" message to the UE. This message contains information elements: MBMS Service Id, MBMS RBparameters, Service area Info.

510 If step 509 exists, the UE completes the corresponding configuration and sends an "active set update complete" message to the RNC.

511 Delete the RL of the source cell when it is necessary to delete the RL of the source cell according to the measurement report of the UE, the purpose, and the RB information of the source cell.

Claims (3)

1. the method for a notifying user equipment UE PTM transmission bearer comprises step:

The bearing mode of the CRNC decision MBMS business in the sub-district of controlling is PTM;

CRNC sends the MBMS channel and reshuffles to UE all in this sub-district.

2. method according to claim 1 is characterized in that described MBMS channel reconfiguration message comprises the MBMS service identification.

3. method according to claim 1 is characterized in that described MBMS reconfiguration message comprises the information of MBMS radio bearer.

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