WO2012122816A1 - 一种确定用户设备切换的目标小区的方法和*** - Google Patents
一种确定用户设备切换的目标小区的方法和*** Download PDFInfo
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- WO2012122816A1 WO2012122816A1 PCT/CN2011/082371 CN2011082371W WO2012122816A1 WO 2012122816 A1 WO2012122816 A1 WO 2012122816A1 CN 2011082371 W CN2011082371 W CN 2011082371W WO 2012122816 A1 WO2012122816 A1 WO 2012122816A1
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- service information
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- 238000000034 method Methods 0.000 title claims abstract description 38
- 208000037924 multicystic encephalomalacia Diseases 0.000 claims description 7
- 230000011664 signaling Effects 0.000 description 33
- 238000005259 measurement Methods 0.000 description 24
- 230000005540 biological transmission Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000007726 management method Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000013468 resource allocation Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0007—Control or signalling for completing the hand-off for multicast or broadcast services, e.g. MBMS
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/40—Connection management for selective distribution or broadcast
Definitions
- the present invention relates to the field of mobile multimedia communications, and more particularly to a method and system for determining a target cell for user equipment handover. Background technique
- the 3rd Generation Partnership Project (3GPP) proposes a Multimedia Broadcast Multicast Service (MBMS) service, which is a data source.
- MBMS Multimedia Broadcast Multicast Service
- the technology for transmitting data by multiple target mobile terminals realizes the sharing of resources of the core network and the access network in the network, and improves the utilization of network resources, especially the utilization of air interface resources.
- the MBMS service defined by 3GPP can not only realize plain text low-rate message class multicast and broadcast, but also realize high-speed multimedia service broadcast and multicast, and provide a variety of rich video, audio and multimedia services, which undoubtedly conforms to the future.
- the trend of mobile data development provides a better business prospect for the development of 3G.
- a user equipment (UE, or terminal) that normally receives an MBMS service can be in two states: One is a Radio Resource Control (RRC) connection state (referred to as a connection) The state is RRC idle state (referred to as idle state). According to whether the UE is receiving the unicast service, it can be determined whether the UE that is receiving the MBMS service is in the connected state or in the idle state. When the UE is receiving the unicast service, the UE is in the connected state. The UE in the idle state does not establish an RRC connection with the network side, and the UE in the connected state establishes an RRC connection with the network side.
- RRC Radio Resource Control
- the UE in the idle state In the process of the mobile, the UE in the idle state generally enters the target cell according to the cell reselection procedure, and the UE in the connected state generally uses the cell handover procedure to enter the target cell.
- the handover of the connected UE can be divided into several phases: First, it is the handover preparation phase.
- the current cell control UE in which the UE is located controls the neighboring cell, that is, controls the list of neighboring cells to be measured configured by the evolved Node B (eNB) of the current cell.
- eNB evolved Node B
- the cell list that meets the measurement requirements is reported to the current cell.
- the current cell ie, the eNB that controls the current cell, or the eNB or the source cell, which is simply referred to as the source cell
- the current cell is comprehensively considered according to the signal quality and load status of the cell that the UE reports to meet the measurement requirements, and selects a suitable cell as the target cell of the UE. .
- the source cell sends a handover request to the target cell, and the target cell performs access control, and feeds back some parameters of the target cell to the source cell. After receiving the information, the source cell sends an RRC connection reconfiguration message to the UE.
- the UE After the UE accesses the target cell according to the message and obtains the uplink resource allocation and the tracking area of the target cell, the UE sends an RRC connection reconfiguration complete message to the target cell. Finally, it is the post-completion phase. At this stage, the core network completes the path switching work, and the core network switches the data sent by the source cell to the target cell, and finally the target cell notifies the source cell to release the relevant resources. It should be specially stated that this process can be simplified if the source cell and the target cell are under the control of the same eNB. In the present invention, it is specifically analyzed for the case where two cells belong to different eNBs.
- the handover of the connected UE is mainly based on ensuring the continuity of the unicast service, that is, the unicast service such as the voice call of the UE cannot be interrupted when the user switches from one cell to another.
- the MBMS service transmitted by the multicast mode can also be simultaneously used.
- the UE switches from the source cell to the target cell, there are two situations, one
- the source cell and the neighboring cell (generally referred to as the neighboring cell before being determined as the handover target cell) belong to the same eNB.
- the eNB where the source d and the zone are located can know the MBMS service information of the neighboring cell, that is, The cell is using information of all MBMS services played in the multicast single frequency network (MBSFN) mode.
- the source cell and the neighboring cell belong to different eNBs, and the eNB where the source cell is located does not know the neighbors.
- FIG. 1 is a schematic diagram of distribution of neighboring cells and their eNBs when UE is handed over. As shown in FIG. 1, cells 1, 2, 3, 4, and 5 are all controlled by eNB1; cells 6, 7, 8, and 9 are all controlled by eNB2; Cells 10, 11, 12, 13, 14, and 15 all belong to eNB3 control.
- the eNB1 When the UE that needs to be handed over is located in the cell 4, since the cells 2, 3, and 5 belong to the same eNB as the cell 4, the eNB1 is responsible for forwarding the MBMS service information of the cells 2, 3, and 5; and for the cells 7, 9 and 10, Since the cell 4 does not belong to the same eNB, the eNB1 where the cell 4 is located does not know the MBMS service information of the cells 7, 9, and 10.
- the criterion for determining the target cell of the UE handover by the source cell is determined according to the signal quality and the load condition of the cell unicast service, and the target cell to which the handover is performed cannot guarantee the MBMS service, and the target cell cannot be guaranteed even if the MBMS service is provided.
- the same MBMS service as the source cell can be provided. Therefore, according to the current unicast criterion, when the source cell controls the UE handover, there is no guarantee that the target cell to which the UE is handed over can provide the MBMS service that is receiving or interested. After the UE switching of the MBMS service being received, the MBMS service that it is receiving may be interrupted, and thus cannot be continuously received.
- the main object of the present invention is to provide a method and a system for determining a target cell for user equipment handover, which can solve the problem that the target cell cannot be guaranteed to be receiving or interested in the target cell when the source cell controls the UE handover.
- the problem of the MBMS business is to provide a method and a system for determining a target cell for user equipment handover, which can solve the problem that the target cell cannot be guaranteed to be receiving or interested in the target cell when the source cell controls the UE handover.
- the present invention provides a method for determining a target cell for user equipment handover, and the method includes: The control network element of the source cell where the UE is located sends an MBMS service information request to the control network element of one or more neighboring cells;
- the control network element of the neighboring cell sends the MBMS service information of the neighboring cell to the control network element of the source cell;
- the control network element of the source cell selects the target cell for handover according to the received MBMS service information.
- the control network element includes: an evolved base station (eNB), or a multi-cell/multicast cooperative entity (MCE), or a mobility management entity (MME).
- eNB evolved base station
- MCE multi-cell/multicast cooperative entity
- MME mobility management entity
- the selecting the target cell to be handed over includes: selecting a neighboring cell that can provide the UE with the same MBMS service as the source cell, and having the best signal quality and load status as the target cell of the handover.
- the MBMS service information includes: an MBSFN area ID of the neighboring cell, and further includes one or more of the following information: an identifier list of the MBMS service sent by the neighboring cell, and the neighboring cell sends The frequency of the MBMS service, the MBMS service identifier list that the neighboring cell has stopped transmitting, and the MBMS service identifier list that the neighboring cell plans to send.
- the MBMS service information request or the MBMS service information includes: adding a new information element (IE) to an existing message, or creating a new message as an MBMS service information request or MBMS service information;
- IE information element
- the sending the MBMS service information request or the sending the MBMS service information includes: sending, by using an X2 interface between the source cell and the eNB of the neighboring cell, or by using the M2 between the source cell and the MCE to which the eNB of the neighboring cell belongs.
- the interface sends or sends it through the MME.
- the present invention further provides a system for determining a target cell of a user equipment handover, where the system includes: a control network element of a source cell and a control network element of a neighboring cell, where The control network element of the source cell is configured to send to a control network element of one or more neighboring cells
- the MBMS service information request according to the received MBMS service information, select a target cell for handover for the UE in the source cell;
- the control network element of the neighboring cell is configured to send the MBMS service information of the neighboring cell to the control network element of the source cell after receiving the MBMS service information request.
- the control network element of the source cell and the control network element of the neighboring cell include: an eNB, or an MCE, or an MME.
- the control network element of the source cell selects the target cell to be handed over, and includes: the control network element of the source cell selects a neighboring cell that can provide the UE with the same MBMS service as the source cell and has the best signal quality and load status. As the target cell for handover.
- the MBMS service information sent by the control network element of the neighboring cell includes: an MBSFN area ID of the neighboring cell, and further includes one or more of the following information: an MBMS service sent by the neighboring cell An identifier list, a frequency point of the MBMS service that the neighboring cell sends, an identifier list of the MBMS service that the neighboring cell has stopped transmitting, and an identifier list of the MBMS service that the neighboring cell plans to send.
- the MBMS service information request sent by the control network element of the source cell or the MBMS service information sent by the control network element of the neighboring cell includes: adding a new IE to an existing message, or creating a new message as an MBMS Service information request or MBMS service information;
- the MBMS service information request sent by the control network element of the source cell or the MBMS service information sent by the control network element of the neighboring cell includes: sending, by the X2 interface between the source cell and the eNB of the neighboring cell, or by The M2 interface between the source cell and the MCE to which the eNB of the neighboring cell belongs is sent or transmitted by the MME.
- the MBM service information request is sent to the control network element of one or more neighboring cells by the control network element of the source cell where the UE is located;
- the network element sends the neighboring cell to the control network element of the source cell.
- the MBMS service information of the source cell; the control network element of the source cell selects the target cell for handover according to the received MBMS service information.
- the source eNB of the UE obtains the MBMS service information of the cell that meets the UE measurement condition, and ensures that the cell that can continuously receive the MBMS service is used as the target cell, so as to ensure the unicast continuity of the UE.
- the continuity of the MBMS service received by the UE is guaranteed to the greatest extent.
- FIG. 1 is a schematic diagram of distribution of neighboring cells and their eNBs when a UE switches
- FIG. 2 is a schematic flowchart of a method for determining a target cell of a user equipment handover according to the present invention
- FIG. 3 is a schematic flowchart of a method for determining a target cell of a user equipment handover according to the present invention
- FIG. 4 is a schematic flow chart of a method for determining a target cell of a user equipment handover according to the present invention
- FIG. 5 is a schematic structural diagram of a system for determining a target cell for user equipment handover according to the present invention. detailed description
- the basic idea of the present invention is that the control network element of the source cell where the UE is located sends an MBMS service information request to the control network element of one or more neighboring cells; the control network element of the neighboring cell sends the control network element to the control cell of the source cell.
- the MBMS service information of the neighboring cell; the control network element of the source cell selects the target cell for handover according to the received MBMS service information, combining the signal quality and the load condition for the UE.
- FIG. 2 is a schematic flowchart of a method for determining a target cell for user equipment handover according to the present invention. As shown in FIG. 2, the method specifically includes:
- Step 201 The control network element of the source cell where the UE is located sends an MBMS service information request to the control network element of one or more neighboring cells.
- the control network element includes: an eNB, or a Multi-cell/Multicast Coordination Entity (MCE), or a Mobility Management Entity (MME).
- MCE Multi-cell/Multicast Coordination Entity
- MME Mobility Management Entity
- the eNB of the current cell in which the UE is located receives the neighbor cell list that satisfies the measurement condition sent by the UE.
- the eNB of the neighboring cell is required to feed back the MBMS service information to the current eNB, for example, whether the cell provides the MBMS service, which MBSFN area belongs, which MBMS services and the like are provided.
- the MBMS service information request is configured by: adding a new information element (IE) to the existing message, or using the new message as the MBMS service information request or the MBMS service information.
- the sending the MBMS service information request includes: sending by using an X2 interface between the eNBs, or by using an M2 interface between the MCEs to which the eNB belongs, or by using the MME to forward.
- the manner of the forwarding specifically includes: when there is no direct X2 interface between the current eNB and the eNB of the neighboring cell, the eNB of the current cell sends the request to the neighbor by using the MME and the S1 interface.
- the eNB of the cell is first sent to the eNB through the X2 port of the other eNB, and then sent to the eNB of the neighboring cell through the X2 port between the eNB and the eNB of the neighboring cell; or sent through the M2 interface first.
- the eNB is sent to the eNB of the other cell through the X2 interface with the other eNB, and then
- the request information and the like are further transmitted by the eNB of the other cell and the M2 interface of the MCE of the target neighboring cell.
- other network elements can also be used. To forward, or forward multiple times between multiple network elements.
- the eNB that sends the MBMS service information request to the UE is directed to all the eNBs that are not in the same eNB as the current cell and are in the current cell.
- the eNB of the neighboring cell that does not include the MBMS service information of the cell transmits an MBMS service information request. If the neighboring cell belongs to the same eNB as the current cell, it is not in the cell that sends the MBMS service information request.
- the neighboring cell that receives the MBMS service information request or sends the MBMS service information mentioned below, unless otherwise stated, has the same meaning here, that is, does not belong to the same eNB as the current cell, and the eNB of the current cell
- the neighboring cell of the MBMS service information of the target neighboring cell is not included in the neighbor cell list.
- Step 202 The control network element of the neighboring cell sends the MBMS service information of the neighboring 'j, the area to the control network element of the source cell;
- the MBMS service information includes: adding a new IE to an existing message, or creating a new message as an MBMS service information request or MBMS service information; and sending the MBMS service information, including: The X2 interface between the eNBs of the neighboring cells is sent, or is sent by the M2 interface between the source and the MCE to which the eNB of the neighboring cell belongs, or is sent by the MME.
- the MBMS service information includes at least: an MBSFN area ID of the neighboring cell.
- an identifier list of the MBMS service sent by the neighboring cell may be included: an identifier list of the MBMS service sent by the neighboring cell, a frequency point of the MBMS service sent by the neighboring cell, and an MBMS service that the neighboring cell has stopped transmitting.
- the identifier list of the MBMS service may be one or more of the following information: MBMS Service ID, MBMS Session ID, TMGI (Temporary Mobile Group Identity), LCID (Logical Channel Identity, Logic) Channel number).
- the eNB of the neighboring cell After the eNB of the neighboring cell receives the MBMS service information request sent by the eNB of the source cell, the eNB of the neighboring cell will The MBMS service information of the neighboring cell under control is sent to the eNB of the source cell.
- the MBMS service information is preferably an MBSFN area ID of a neighboring cell.
- the eNB of the current source cell receives the null feedback or does not receive the feedback, the eNB may consider that the neighboring cell cannot provide the MBMS service.
- the MBMS service information of the source cell may be sent in the MBMS service request, and the eNB of the neighboring cell receives the same MBMS service information after receiving the same, and then feeds back a positive indicator; The same, feedback a negative indicator or no feedback.
- the MCE when the sending of the MBMS service information request is performed by the MCE, that is, when the MCE is the receiver of the MBMS service information request, the MCE receives the MBMS service information sent by the eNB of the source cell.
- the MBMS service information of the neighboring cell may be queried, and may be an MBSFN area ID or other MBSFN area that can identify the cell and information for providing an MBMS service, and then send the information to the eNB of the source cell. If the neighboring cell and the source cell belong to the same MBSFN area, the MBMS service information can be obtained by direct query. If it does not belong to the same MBSFN area, the MCE must be queried by the MCE.
- the MBMS service information of the neighboring cell may be fed back or not, so that the source cell can know that the target neighboring cell is not in the same MBSFN area as itself.
- the MCE may also search whether the neighboring cell belongs to the same MBSFN area as the source cell, and if yes, feed back a positive indicator, such as 1; if not, feedback 0 or no feedback.
- a positive indicator such as 1
- the specific feedback depends on the The contents of the MBMS service information request, the general engineering staff can easily construct a variety of methods, and will not be described here.
- Step 203 The control network element of the source cell selects a target cell for handover according to the received MBMS service information.
- the target cell that is selected for the handover is specifically: comprehensively considering the signal quality, the load status, and the MBMS service information of the neighboring cell, selecting to provide the UE with the same MBMS service as the source cell, and the signal quality and the group status.
- the best neighboring cell seat switching target cell is specifically: comprehensively considering the signal quality, the load status, and the MBMS service information of the neighboring cell, selecting to provide the UE with the same MBMS service as the source cell, and the signal quality and the group status.
- the target cell of the handover refers to a cell selected according to the following principle: Step 203a, comprehensively considering the signal quality and load level of the neighboring cell, and performing sorting; specifically, the principle of the sorting is : Preference is given to cells with good neighboring cell signals and good load.
- Step 203b On the basis of the foregoing sorting, preferentially select a cell that is consistent with the source cell MBMS service information of the UE as the target cell of the handover.
- the information is consistent, that is, the MBSFN area of the neighboring cell is the same as the MBSFN area of the source cell, or the multiple MBSFN areas of the neighboring cell include the MBSFN area of the source cell, or the MBSFN area of the neighboring cell.
- the foregoing principle may be extended to: select a cell with a good signal quality and a good load degree in a neighboring cell to form a new cell list; and preferentially select a cell from the cell list that is consistent with the current cell MBMS service information of the UE.
- the cell is used as the target cell; when there are multiple cells that meet the condition, one of the cells may be selected as the target cell according to the existing unicast handover condition.
- the basic principle is to ensure that unicast continuity is maintained. Authenticate the continuity of the MBMS business.
- FIG. 3 is a schematic flowchart of a method for determining a target cell of a user equipment handover according to the present invention. As shown in FIG. 3, the method includes:
- Step 301 The source eNB controls UE measurement, and the UE reports all neighbor cell lists that meet the UE measurement threshold.
- the UE measurement threshold requirement is performed according to the provisions of the existing protocol. All cells that meet the UE measurement threshold can be used as candidate targets for UE handover.
- the source eNB refers to an eNB that controls a source cell where the UE is currently located.
- Step 302 The source eNB of the UE sends an MBMS service information request to an eNB of a neighboring cell that meets the measurement threshold requirement.
- the neighboring cell that meets the measurement threshold requirement refers to a cell in the neighbor cell list that is reported by the UE after measurement.
- the eNB of the neighboring cell and the eNB of the source cell belong to the same eNB, that is, the same network element, or the neighboring cell list of the source eNB of the UE includes the MBMS service information of the neighboring cell, only the eNB needs to pass the MBMS service information of the neighboring cell.
- the source eNB can learn the MBMS service information of the neighboring cell, and therefore does not need to use the present invention to send the MBMS service information request.
- the MBMS service information needs to be sent only to the eNB of the neighboring cell. request.
- the source eNB may send the service information request by using signaling on the X2 interface.
- a new IE may be added to the existing signaling, or the new signaling may be used to send the service information request.
- This embodiment preferably uses the new signaling to send the MBMS service information request, such as an MBMS Status Request message, and may use a message with feedback or no feedback.
- This embodiment preferably has a feedback message, and the feedback information may be an MBMS Status Request Acknowledge message.
- the MBMS service information request may not include MBMS service information of the current cell, and only all neighbor cells satisfying the condition are indicated.
- the eNB feeds back the MBMS service information of the neighboring cell, and may also include its own MBMS service information, indicating whether the eNB feedback of all the neighboring cells satisfying the condition is consistent with the MBMS service information of the current cell, and if yes, the feedback is positive. For example, "1", otherwise the indicator of negative feedback, such as "0"; may further include information about the MBMS service that the UE that needs to switch is receiving, for example: the MBSFN area ID to which it belongs, the MBMS service ID, And/or other information that can identify the MBMS service of the cell, and the like.
- the MBMS service information of the neighboring cell is consistent with the information in the MBMS service information request of the source cell, a positive indicator is fed back, otherwise a negative indicator is fed back.
- the foregoing methods are only some preferred methods, and the requests may be sent in other forms in the MBMS service information request, and the requested neighboring cells are required to be fed back in a corresponding manner.
- the request may be sent in a forwarding manner.
- the forwarding mode includes: the source eNB sends the request to the eNB of the neighboring cell through the MME and the S1 interface; or sends the eNB to the other eNB through the X2 port of the other eNB, and then passes the eNB and the eNB of the neighboring cell.
- the X2 port is sent to the eNB of the neighboring cell; or is sent to the MME and the multicast gateway through the M2 and M3 interfaces, and then sent to the eNB of the neighboring cell.
- other network elements may be used for forwarding, or may be forwarded multiple times between multiple network entities.
- these requests can be sent using the signaling in the above interface, either by adding a new IE to the existing signaling or by sending a new signaling.
- Step 303 The eNB of the neighboring cell that meets the measurement threshold requirement sends the MBMS service information of the neighboring cell to the source eNB of the UE.
- the MBMS service information refers to an MBSFN area ID to which a neighboring cell belongs.
- one or more of the following information may be included: an identifier list of the MBMS service sent by the cell, a frequency point of sending the MBMS service, an identifier list of the MBMS service that has been sent but is now stopped, and an identifier of the MBMS service to be sent. List, etc.
- Send other information related to the MBMS service may be used to describe its own MBMS service information according to different transmission requests.
- the eNB of the neighboring cell that meets the threshold requirement transmits its own MBMS service information on the same channel or interface as the MBMS service information request.
- the MBMS service information is sent through the X2 interface or forwarding mode.
- the forwarding mode includes: the eNB of the neighboring cell that meets the threshold requirement sends the MBMS service information of the cell to the source eNB of the UE through the MME and the S1 interface; or the eNB of the neighboring cell that meets the threshold requirement
- the MBMS service information of the cell is sent to other neighboring eNBs through the X2 interface, and the neighboring eNB sends the information to the source eNB of the UE through the X2 interface.
- the eNB of the neighboring cell that meets the threshold requirement may also pass the MCE and The M2 and M3 interfaces on the MBMS gateway send their own MBMS service information to the source eNB of the UE.
- the above is only a preferred method, and the neighboring cell MBMS service information may be sent to the source eNB of the UE through other network elements or interfaces.
- the MBMS service information may be sent to the current cell of the UE by using the signaling on the interface in the X2 interface or the forwarding mode.
- the signaling may be existing signaling in which new IE information is added; it may also be new signaling.
- the specific interface or sending mode, and the signaling carrying the information, are determined according to the interface or sending mode of the MBMS service information request and its bearer signaling.
- Step 304 The source eNB of the UE selects a cell with a suitable condition from the neighboring cell as a target cell for UE handover.
- the cell with the appropriate condition refers to a cell selected according to the following principles: comprehensively considering the signal quality and load level of the neighboring cell, and performing sorting; on the basis of the above sorting, preferentially selecting the current cell MBMS with the UE A cell with the same service information is used as the cell with the appropriate conditions.
- the above principle can be further extended as follows: selecting a cell with good signal quality and good load in a neighboring cell to form a new cell list; prioritizing from the cell list A cell that is consistent with the current cell MBMS service information of the UE is selected as the cell with the appropriate condition.
- the cell is considered to be consistent with the current cell MBMS service information of the UE.
- the MBSFN area of the current cell of the UE exceeds one, only the MBSFN area of the neighboring cell is the same as the MBSFN area of the MBMS service received by the UE in the current cell, and the cell is considered to be consistent with the current cell MBMS service information of the UE.
- a suitable cell has been described above, it is not limited thereto.
- the basic principle is to ensure the continuity of the MBMS service on the basis of ensuring unicast continuity.
- some neighboring cells that can provide MBMS service continuity may be selected first, and then the appropriate cell is selected as the target cell according to the processing mode of the unicast cell. In this case, when there are fewer neighboring cells that can provide MBMS service continuity, there may be a discontinuity in the unicast service. Therefore, this mode is not the most preferred mode of the present invention, but is only a possible implementation.
- the source eNB controls the UE to initiate a handover procedure to the target cell, switches to the target cell, and continues to receive the MBMS service in the target cell.
- the advantages of using the above method are as follows: The continuity of the MBMS service of the UE can be improved as much as possible, and the user experience is improved.
- the X2 interface between the eNBs of each cell exists, and the MBMS service information of the neighboring cell is transmitted through the X2 interface, which is relatively easy to implement, and the resources on the X2 port are relatively abundant.
- the method of the embodiment is used to improve the continuity of the MBMS service, and does not affect the continuous reception of the unicast service of the cell, and has good standardization and practical value.
- FIG. 4 is a schematic flowchart of a method for determining a target cell of a user equipment handover according to the present invention. As shown in FIG. 4, the method includes:
- Step 401 The network side controls the UE to measure, and the UE reports all neighbor cell lists that meet the UE measurement threshold.
- the measurement threshold of the UE is determined according to the provisions of the current specification.
- UE measurement including configuration Measurement interval measurement and measurement without measurement interval, the specific configuration depends on the configuration of the network.
- the network refers to a network element that controls measurement by the UE. Specifically, it may be an eNB that controls a current cell of the UE, that is, a source eNB. It may also be an MCE or MME that controls the source eNB of the UE.
- Step 402 The source eNB of the UE sends the MBMS service information request of the neighbor cell to the MCE.
- the neighboring cell refers to a neighboring cell that is reported by the UE and meets a measurement threshold. Further, the neighboring cell does not belong to the same eNB as the current source cell, and/or the neighboring cell list of the source eNB of the UE does not include the MBMS service information of the neighboring cell.
- the MBMS service information refers to an MBSFN area ID of a neighboring cell.
- the MBMS service information may further include one or more of the following information: an identifier list of the MBMS service sent by the neighboring cell, a frequency point of sending the MBMS service, and an identifier of the MBMS service that has been sent but is now stopped to be sent.
- the list, the list of identifiers of the MBMS service to be sent, and the like can identify the information of the MBMS service.
- the source eNB of the UE After receiving the neighboring list and the area list reported by the UE, the source eNB of the UE sends the MBMS service information request to the MCE through the signaling on the M2 interface.
- the MBMS service information request may be sent by adding an IE to the original signaling, or by using a new signaling.
- the MBMS service information request may be sent in a forwarding manner.
- the current cell may send the MBMS service information request to other eNBs, and the other eNB forwards the information to the MCE through the M2 interface.
- the MBMS service information request may also be sent to the MCE by using other network elements or interfaces.
- the MBMS service information request is transmitted by using the signaling on the interface involved in the forwarding mode, and the MBMS service information may be sent by adding an IE to the existing signaling or by using new signaling. request.
- the MBMS service information request may include only the list of the neighboring cells, and the MCE feeds back the MBMS service information of the neighboring cell according to the list.
- the MCE feeds back the MBMS service information of the neighboring cell according to the list.
- the MBMS service information of the previous cell and the neighbor cell list are sent to the MCE, and the MCE queries which cells are consistent with the MBMS service information of the current cell, and then feeds the cell information to the current cell.
- the source eNB of the UE can learn the MBMS service information of the neighboring cell, other agreed manners can also be adopted.
- Step 403 The MCE sends the MBMS service information of the neighboring cell to the source eNB of the UE according to the request.
- the MCE after receiving the MBMS service information request sent by the source eNB of the UE, the MCE directly searches for the MBMS service information of the neighboring cell, and sends the information to the source eNB of the UE through the signaling on the M2 interface;
- the MBMS gateway queries the MBMS service information of the neighboring cell, and sends the signaling on the M2 interface to the eNB of the current cell of the UE.
- the MBMS service capability of the cell can be queried in the MCE of the current cell; If the information of the neighboring cell is not queried in the MCE of the current cell, the cell may not belong to the MBSFN area where the current cell is located.
- the MCE may feed back the MBMS service information of the neighboring cell to the current cell in a corresponding manner according to the MBMS service information request sent by the source eNB. For example, the eNB of the current cell sends the neighboring d, the area list to the MCE in the MBMS service information request, and the MCE feeds back the MBMS service information of the neighboring cell to the eNB of the current cell. If some neighboring cells in the list cannot be found in the MCE, the feedback may be null or no feedback, and other MCE or MBMS entities may be queried before being fed back. When querying other MCE or MBMS entities, you need to set the corresponding timer. If the timeout is exceeded, the cell cannot be considered to provide MBMS services.
- the MCE can also feed back only the neighbor cell list to the MBSFN area where the current cell is located. In this case, only one indicator can be fed back.
- the same MBMS service is sent only in one MBSFN area, but not in multiple MBSFN areas. Therefore, only the MCE where the eNB of the current cell is located can be found. For transmissions that may be spread across multiple MBSFN areas, it may be necessary to query the MBMS service information of the neighboring cells of other MCEs.
- the signaling for carrying the MBMS service information may be either existing signaling or new signaling. Specifically, it is determined according to the signaling form adopted by the MBMS service information request in step 402.
- the MBMS service information request uses an existing signaling bearer
- the MBMS service information is also carried on the corresponding existing signaling; when the MBMS service information request adopts new signaling, the MBMS service information is used. It is also carried on the corresponding new signaling.
- the network element and interface used for the transmission are the same as those in step 402.
- the MBMS service information also uses signaling on the same interface.
- the forwarding mode is adopted in step 402
- the MBMS service information also adopts a forwarding mode.
- Step 404 The source eNB of the UE selects an appropriate cell as the target cell for UE handover according to the signal quality, the load status, and the MBMS service information of the neighboring cell.
- the cell with the appropriate condition refers to a cell selected according to the following principles: comprehensively considering the signal quality and load level of the neighboring cell, and performing sorting; on the basis of the above sorting, preferentially selecting the current cell MBMS with the UE A cell with the same service information is used as the cell with the appropriate conditions.
- the foregoing principle may be further extended as follows: selecting a cell with a good signal quality and a good load degree in a neighboring cell to form a new cell list; and preferentially selecting, from the cell list, a message consistent with the current cell MBMS service information of the UE.
- the cell serves as a suitable cell for the condition.
- the cell is considered to be consistent with the current cell MBMS service information of the UE.
- the MBSFN area of the current cell of the UE exceeds one, only the MBSFN area of the neighboring cell and the MBSFN of the MBMS service received by the UE in the current cell are available. The area is the same, and the cell is considered to be consistent with the current cell MBMS service information of the UE.
- a suitable cell has been described above, it is not limited thereto.
- the basic principle is to ensure the continuity of the MBMS service on the basis of ensuring unicast continuity.
- some neighboring cells that can provide MBMS service continuity may be selected first, and then a suitable cell is selected as the target cell according to the processing mode of the single cell. In this case, when there are fewer neighboring cells that can provide MBMS service continuity, there is a possibility that the unicast service is discontinuous. Therefore, this approach is not preferred as a preferred embodiment of the present invention.
- the source eNB may control the UE to initiate a handover to the target cell, so that after the UE enters the target cell, the UE can continue to receive the MBMS service of interest, thereby ensuring the continuity of the user service reception.
- the advantage of this embodiment is: by querying the MBMS service information of the neighboring cell that satisfies the UE measurement condition from the MCE, and preferentially selecting the neighboring cell that can provide the continuity of the MBMS service as the UE handover for the UE on the basis of ensuring the continuity of the unicast service.
- the target cell improves the continuity of the UE when receiving the MBMS service.
- the current cell only needs to send signaling to the MCE to obtain the MBMS service information of the required neighboring cell, which reduces the signaling burden of the system and has good practical value.
- FIG. 5 is a schematic flowchart of a system for determining a target cell for user equipment handover according to the present invention. As shown in FIG. 5, the system includes: a control network element 51 of a source cell and a control network element 52 of a neighboring cell, where
- the control network element 51 of the source cell is configured to send an MBMS service information request to the control network element 52 of one or more neighboring cells, and select a target cell to be handed over for the UE in the source cell according to the received MBMS service information.
- the control network element 51 of the source cell includes: an eNB, or an MCE, or an MME.
- the control network element 51 of the source cell selects the target cell to be handed over to the UE in the source cell, and includes: the control network element 51 of the source cell selects to provide the same MBMS service as the source cell, and the signal quality and the group are in the The target cell of the best neighboring cell seat handover.
- the MBMS The service information request includes: adding a new IE to the existing message, or using the new message as the MBMS service information request; the MBMS service information request, including: sending by using an X2 interface between the eNBs, or by the eNB
- the M2 interface between the MCEs is sent by means of MME forwarding.
- the control network element 51 of the source cell where the UE is located that is, the source eNB, after receiving the neighbor cell list that is sent by the UE and satisfying the measurement condition, queries the neighbor cell list, and when the MBMS service information of the neighboring cell is not included therein, And transmitting, by the eNB of the one or more neighboring cells, the MBMS service information request by using the PTP or the PTM, requesting the eNB of the neighboring cell to feed back the MBMS service information to the current eNB, for example, whether the cell provides the MBMS service.
- the sending manner of the MBMS service information request includes: sending by using an X2 interface between the eNBs, or by using an M2 interface between the MCEs to which the eNB belongs, or by using a forwarding manner.
- the manner of the forwarding specifically includes: when there is no direct X2 interface between the current eNB and the eNB of the neighboring cell, the eNB of the current cell sends the request to the phase by using the MME and the S1 interface.
- the eNB of the neighboring cell is first sent to the eNB through the X2 port of the other eNB, and then sent to the eNB of the neighboring cell through the X2 port between the eNB and the eNB of the neighboring cell; or first through the M2 interface And sent to the MME, and then sent by the MME to the eNB of the neighboring cell through the M2 interface; or when the M2 interface does not exist between the current eNB and the MCE, the eNB is sent to the eNB of the other cell through the X2 interface with other eNBs. Then, the request information and the like are transmitted through the M2 interface of the MCE of the other cell and the MCE of the target neighboring cell.
- other network elements may also be used for forwarding, or may be forwarded multiple times between multiple network elements.
- the control network element 52 of the neighboring cell is configured to send the MBMS service information of the neighboring cell to the control network element 51 of the source cell after receiving the MBMS service information request.
- the control network element 52 of the neighboring cell includes: an eNB, or an MCE, or an MME.
- the MBMS service information sent by the control network element 52 of the neighboring cell includes: the neighboring cell MBSFN area ID.
- one or more of the following information may be included: an identifier list of the MBMS service sent by the neighboring cell, a frequency point of the MBMS service sent by the neighboring cell, and an MBMS service that the neighboring cell has stopped transmitting.
- the identifier list, the identifier list of the MBMS service that the neighboring cell plans to send.
- the MBMS service information includes: adding a new IE to an existing message, or adding a new message as the MBMS service information; the sending manner of the MBMS service information includes: sending by using an X2 interface between the eNBs, or by using an eNB The M2 interface between the MCEs to which the MCE belongs, or sent by the MME.
- the eNB of the neighboring cell After the control network element 52 of the neighboring cell receives the MBMS service information request sent by the eNB of the source cell, the eNB of the neighboring cell sends the MBMS service information of the neighboring cell under the control to the eNB.
- the MBMS service information is preferably the MBSFN area ID of the neighboring cell.
- the eNB of the current source cell receives null feedback or does not receive feedback, it can be considered that the neighboring cell cannot provide the MBMS service.
- the MBMS service information of the source cell may be sent in the MBMS service request, and the eNB of the neighboring cell receives the same MBMS service information after receiving the same, and then feeds back a positive indicator; The same, feedback a negative indicator or no feedback.
- the MCE when the sending of the MBMS service information request is performed by the MCE, that is, when the MCE is the receiver of the MBMS service information request, the MCE receives the MBMS service information sent by the eNB of the source cell.
- querying the MBMS service information of the neighboring cell may be an MBSFN area ID or other information indicating an MBSFN area of the cell and providing an MBMS service, and then transmitting the information to the source cell. eNB. If the neighboring cell and the source cell belong to the same MBSFN area, the MBMS service information can be obtained by direct query. If it does not belong to the same MBSFN area, the MCE must be queried by the MCE.
- the MBMS service information of the neighboring cell may be fed back or not, so that the source cell can know that the target neighboring cell is not in the same MBSFN area as itself.
- the MCE may also search whether the neighboring cell belongs to the same MBSFN area as the source cell, and if yes, feed back a positive indicator, such as 1; if not, feedback 0 or no feedback.
- a positive indicator such as 1
- an index or a bitmap indication corresponding to a neighboring cell of the same MBSFN of the source cell may be directly fed back according to the neighbor cell list sent by the source cell.
- the specific feedback content depends on the content of the MBMS service information request, and a general engineering staff can easily construct a plurality of methods, which are not described herein.
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Abstract
本发明公开了一种确定用户设备切换的目标小区的方法,由用户设备(UE)所在源小区的控制网元,向一个或多个相邻小区的控制网元发送多媒体广播多播(MBMS)业务信息请求;相邻小区的控制网元向源小区的控制网元发送所述相邻小区的MBMS业务信息;源小区的控制网元根据接收到的MBMS业务信息,为UE选择切换的目标小区。本发明还公开了一种确定用户设备切换的目标小区的***,通过上述方法和***,能够最大程度的保证用户设备接收MBMS业务的连续性。
Description
一种确定用户设备切换的目标小区的方法和*** 技术领域
本发明涉及移动多媒体通讯领域, 特别是指一种确定用户设备切换的 目标小区的方法和***。 背景技术
随着互联网 (Internet ) 的迅猛发展和大屏幕多功能移动终端的普及, 出现了大量移动数据多媒体业务和各种高带宽多媒体业务, 例如: 视频会 议、 电视广播、 视频点播、 广告、 网上教育、 互动游戏等, 这些业务一方 面满足了移动用户对业务的丰富多样的需求, 同时也为移动运营商带来了 新的业务增长点。 这些移动数据多媒体业务要求多个用户能够同时接收相 同数据, 与一般的数据业务相比, 具有数据量大、 持续时间长、 时延敏感 等特点。
为了有效地利用移动网络资源, 第三代合作伙伴计划 (3rd Generation Partnership Project, 3 GPP )提出了多媒体广播多播服务( Multimedia Broadcast Multicast Service, MBMS )业务, 该业务是一种从一个数据源向多个目标 移动终端传送数据的技术, 实现了网络中核心网和接入网的资源的共享, 提高了网络资源的利用率, 特别是空中接口资源的利用率。 3GPP 定义的 MBMS业务不仅能够实现纯文本低速率的消息类组播和广播, 而且还能够 实现高速多媒体业务的广播和组播, 提供多种丰富的视频、 音频和多媒体 业务, 这无疑顺应了未来移动数据发展的趋势, 为 3G的发展提供了更好的 业务前景。
通常接收 MBMS业务的用户设备(UE,或称终端)可以处于两种状态: 一种为无线资源控制 (Radio Resources Control, RRC )连接态 (简称为连
接态), 另一种为 RRC空闲态 (简称为空闲态)。 根据 UE是否正在接收单 播业务, 可以判断正在接收 MBMS业务的 UE是处于连接态还是处于空闲 态。 当 UE在接收单播业务时, UE处于连接态。 处于空闲态的 UE, 没有 与网络侧建立 RRC连接, 处于连接态的 UE则与网络侧建立了 RRC连接。
在移动的过程中,对于空闲态的 UE—般依照小区重选流程进入目标小 区, 对于连接态的 UE—般使用小区切换流程进入目标小区。 连接态 UE的 切换可以分为几个阶段: 首先, 是切换准备阶段。 在这一阶段, UE所在的 当前小区控制 UE 对邻小区进行测量, 即控制当前小区的演进型基站 ( evolved Node B, eNB ) 为该 UE配置的一个待测量的相邻小区的列表。
UE测量后, 向当前小区上报满足测量要求的小区列表。 当前小区(即控制 当前小区的 eNB, 或者简称为源小区的 eNB或源小区)根据 UE上报的满 足测量要求的小区的信号质量、 负载状况进行综合考虑, 选择一个合适的 小区作为 UE的目标小区。 其次, 是切换阶段。 在这一阶段, 源小区向目标 小区发送切换请求, 目标小区进行接入控制, 并向源小区反馈目标小区的 一些参数。 源小区收到这些信息后, 向 UE发送 RRC连接重配置消息。 UE 根据该消息, 接入目标小区, 取得目标小区的上行资源分配和跟踪区域后, UE向目标小区发送 RRC连接重配置完成消息。 最后, 是切换完成后阶段。 在这一阶段, 核心网完成路径切换工作, 核心网将下发的数据由源小区切 换到目标小区, 并最终由目标小区通知源小区释放相关资源。 需要特别说 明的是, 如果源小区和目标小区处于同一个 eNB的控制下时候, 这个过程 可以简化。在本发明中特别针对两个小区属于不同的 eNB的情况进行分析。
目前连接态 UE的切换主要基于保证单播业务的连续性,即保证用户在 由一个小区切换到另一个小区时, UE的语音通话等单播业务不能中断。 但 是, 目前的 LTE网络中, 除了单播业务外, 还可以同时地采用多播方式发 送的 MBMS业务。 当 UE从源小区切换到目标小区时会面临两种情况, 一
种是源小区与邻小区 (在被确定为切换的目标小区前, 通常称为相邻小区) 属于同一个 eNB , 此时源 d、区所在的 eNB可以知道相邻小区的 MBMS业 务信息, 即该小区正在采用多播单频网 ( MBSFN )模式播放的所有 MBMS 业务的信息; 另一种情况是, 源小区和相邻小区属于不同的 eNB, 此时源 小区所在的 eNB并不知道相邻小区 eNB的 MBMS业务信息。 图 1为 UE 切换时相邻小区及其 eNB的分布示意图, 如图 1 所示, 小区 1、 2、 3、 4 和 5均属于 eNBl控制; 小区 6、 7、 8和 9均属于 eNB2控制; 小区 10、 11、 12、 13、 14和 15均属于 eNB3控制。 当需要切换的 UE位于小区 4时, 由 于小区 2, 3和 5与小区 4属于同一个 eNB, 因此 eNBl负责转发小区 2, 3, 和 5的 MBMS业务信息; 而对于小区 7, 9和 10, 由于与小区 4不属于同 一个 eNB, 因此小区 4所在的 eNBl并不知道小区 7, 9和 10的 MBMS业 务信息。但是, 目前源小区确定 UE切换的目标小区的准则是根据小区单播 业务的信号质量和负载情况确定的, 并不能保证切换到的目标小区能够提 供 MBMS业务, 即使提供 MBMS业务也不能保证目标小区可以提供与源 小区相同的 MBMS业务。 因此, 按照当前单播准则, 源小区控制 UE切换 时, 无法保证 UE 切换到的目标小区能够为其提供正在接收或感兴趣的 MBMS 业务。 这样正在接收的 MBMS 业务的 UE 切换后其正在接收的 MBMS业务可能会中断, 从而无法连续接收。 发明内容
有鉴于此, 本发明的主要目的在于提供一种确定用户设备切换的目标 小区的方法和***, 能够解决源小区控制 UE切换时,无法保证切换到的目 标小区能够为其提供正在接收或感兴趣的 MBMS业务的问题。
为达到上述目的, 本发明的技术方案是这样实现的:
本发明提供了一种确定用户设备切换的目标小区的方法, 所述方法, 包括:
UE 所在源小区的控制网元, 向一个或多个相邻小区的控制网元发送 MBMS业务信息请求;
相邻小区的控制网元向源小区的控制网元发送所述相邻小区的 MBMS 业务信息;
源小区的控制网元根据接收到的 MBMS业务信息, 为 UE选择切换的 目标小区。
其中, 所述控制网元, 包括: 演进型基站( eNB )、 或多小区 /多播协作 实体(MCE )、 或移动管理实体(MME )。
其中, 所述选择切换的目标小区, 包括: 选择能够为 UE提供与源小区 相同 MBMS业务, 且信号质量和负载状况最好的相邻小区作为切换的目标 小区。
其中, 所述 MBMS业务信息包括: 所述相邻小区的 MBSFN区域 ID, 此外还包括以下信息的一种或几种: 所述相邻小区发送的 MBMS业务的标 识列表、 所述相邻小区发送 MBMS业务的频点、 所述相邻小区已经停止发 送的 MBMS业务标识列表、 所述相邻小区计划发送的 MBMS业务标识列 表。
其中, 所述 MBMS业务信息请求或所述 MBMS业务信息包括: 在现 有的消息上增加新的信息单元(IE ), 或新建消息作为 MBMS 业务信息请 求或 MBMS业务信息;
所述发送 MBMS业务信息请求或所述发送 MBMS业务信息, 包括: 通过源小区和相邻小区的 eNB之间的 X2接口发送, 或者通过源小区和相 邻小区的 eNB所属的 MCE之间的 M2接口发送,或者通过 MME转发的方 式发送。
本发明还提供了一种确定用户设备切换的目标小区的***, 所述*** 包括: 源小区的控制网元和相邻小区的控制网元, 其中,
所述源小区的控制网元, 用于向一个或多个相邻小区的控制网元发送
MBMS业务信息请求, 根据接收到的 MBMS业务信息, 为源小区中的 UE 选择切换的目标小区;
所述相邻小区的控制网元, 用于接收到 MBMS业务信息请求后, 向源 小区的控制网元发送所述相邻小区的 MBMS业务信息。
其中,所述源小区的控制网元和所述相邻小区的控制网元,包括: eNB、 或 MCE、 或 MME。
其中, 所述源小区的控制网元选择切换的目标小区, 包括: 所述源小 区的控制网元选择能够为 UE提供与源小区相同 MBMS业务, 且信号质量 和负载状况最好的相邻小区作为切换的目标小区。
其中, 所述相邻小区的控制网元发送的 MBMS业务信息包括: 所述相 邻小区的 MBSFN区域 ID, 此外还包括以下信息的一种或几种: 所述相邻 小区发送的 MBMS业务的标识列表、 所述相邻小区发送 MBMS业务的频 点、 所述相邻小区已经停止发送的 MBMS业务的标识列表、 所述相邻小区 计划发送的 MBMS业务的标识列表。
其中, 所述源小区的控制网元发送的 MBMS业务信息请求或所述相邻 小区的控制网元发送的 MBMS业务信息, 包括: 在现有的消息上增加新的 IE, 或新建消息作为 MBMS业务信息请求或 MBMS业务信息;
所述源小区的控制网元发送的 MBMS业务信息请求或所述相邻小区的 控制网元发送的 MBMS业务信息 , 包括: 通过源小区和相邻小区的 eNB之 间的 X2接口发送,或者通过源小区和相邻小区的 eNB所属的 MCE之间的 M2接口发送, 或者通过 MME转发的方式发送。
本发明所提供的确定用户设备切换的目标小区的方法和***, 由 UE 所在源小区的控制网元, 向一个或多个相邻小区的控制网元发送 MBMS业 务信息请求; 相邻小区的控制网元向源小区的控制网元发送所述相邻小区
的 MBMS业务信息; 源小区的控制网元根据接收到的 MBMS业务信息, 为 UE选择切换的目标小区。 使得 UE在切换之前, UE的源 eNB获取符合 UE测量条件的小区的 MBMS业务信息, 尽量保证以能够使 UE连续接收 MBMS业务的小区作为目标小区, 从而在保证 UE单播连续性的基础上, 最大程度的保证 UE接收 MBMS业务的连续性。 附图说明
图 1为 UE切换时相邻小区及其 eNB的分布示意图;
图 2为本发明一种确定用户设备切换的目标小区的方法流程示意图; 图 3 为本发明确定用户设备切换的目标小区的实施例一的方法流程示 意图;
图 4为本发明确定用户设备切换的目标小区的实施例二的方法流程示 意图;
图 5为本发明一种确定用户设备切换的目标小区的***结构示意图。 具体实施方式
本发明的基本思想是由 UE所在源小区的控制网元,向一个或多个相邻 小区的控制网元发送 MBMS业务信息请求; 相邻小区的控制网元向源小区 的控制网元发送所述相邻小区的 MBMS业务信息; 源小区的控制网元根据 接收到的 MBMS业务信息, 结合信号质量和负载情况为 UE选择切换的目 标小区。
下面结合附图和具体实施例对本发明的技术方案进一步详细阐述。 图 2 为本发明一种确定用户设备切换的目标小区的方法流程示意图, 如图 2所示, 所述方法具体包括:
步驟 201 , UE所在源小区的控制网元, 向一个或多个相邻小区的控制 网元发送 MBMS业务信息请求;
具体的, 所述控制网元包括: eNB、 或多小区 /多播协作实体 ( Multi-cell/multicast Coordination Entity, MCE )、或移动管理实体( Mobility Management Entity, MME )。当 UE的源小区和所述相邻小区属于同一个 eNB 时 , 此时源 eNB与新 eNB属于同一个网元, 则该网元也可以知道相邻 d、区 的 MBMS业务信息, 从而不用发送所述 MBMS业务信息请求。 如果 UE 所处的源小区和所述相邻小区不属于同一个 eNB时, UE所在当前小区的 eNB (后面简称当前 eNB, 也就是源 eNB)接收到 UE发送的满足测量条件的 邻小区列表后, 查询自身的邻小区列表, 当其中不包含所述相邻小区的 MBMS业务信息时,则向一个或多个所述相邻小区的 eNB通过点对点( PTP) 或多点广播 ( PTM )方式发送 MBMS业务信息请求, 要求所述相邻小区的 eNB向当前 eNB反馈其 MBMS业务信息, 例如: 该小区是否提供 MBMS 业务, 属于哪一个 MBSFN区域, 提供哪些 MBMS业务等信息等。
所述 MBMS业务信息请求的构造方式包括: 在现有的消息上增加新的 信息单元(information element, IE ), 或通过新建消息作为 MBMS业务信 息请求或 MBMS业务信息。 所述发送 MBMS业务信息请求, 包括: 通过 eNB之间的 X2接口发送, 或者通过 eNB所属的 MCE之间的 M2接口, 或 者通过 MME转发的方式发送。其中, 所述转发的方式具体包括: 当前 eNB 与所述相邻小区的 eNB之间不存在直接的 X2接口的时候,当前小区的 eNB 通过 MME和 S1接口将所述请求发送给所述相邻小区的 eNB; 或者先通过 与其他 eNB的 X2口发送到其他 eNB,然后再通过该 eNB与相邻小区的 eNB 之间的 X2 口发送到所述相邻小区的 eNB; 或者先通过 M2接口发送到 MME, 然后再由 MME通过 M2接口发送给所述相邻小区的 eNB; 或者在 当前 eNB和 MCE之间不存在 M2接口的时候, 通过与其他 eNB的 X2接 口发送到其他小区的 eNB, 然后再通过所述其他小区的 eNB与目标相邻小 区的 MCE的 M2接口发送所述请求信息等。 当然, 也可以采用其他的网元
来转发, 或者在多个网元间转发多次。
需要特别说明的是,本发明中所述向 UE上报的所有满足 UE测量条件 的相邻小区的 eNB, 发送 MBMS业务信息请求, 是指向所有与当前小区不 属于同一个 eNB, 且当前小区的 eNB 的邻小区列表中, 不包含该小区的 MBMS业务信息的相邻小区的 eNB,发送 MBMS业务信息请求。如果所述 相邻小区与当前的小区属于同一个 eNB, 则不在所述发送 MBMS业务信息 请求的小区之列。 下面提到的接收所述 MBMS 业务信息请求或发送所述 MBMS业务信息的相邻小区, 除非特别声明, 其意义与此处相同, 即与当 前小区不属于同一个 eNB, 且当前小区的 eNB的相邻小区列表中不包含目 标相邻小区的 MBMS业务信息的相邻小区。
步驟 202,相邻小区的控制网元向源小区的控制网元发送所述相邻 ' j、区 的 MBMS业务信息;
具体的, 所述 MBMS业务信息, 包括: 在现有的消息上增加新的 IE, 或新建消息作为 MBMS业务信息请求或 MBMS业务信息; 所述发送所述 MBMS业务信息 , 包括: 通过源小区和相邻小区的 eNB之间的 X2接口发 送 , 或者通过源 '』、区和相邻小区的 eNB所属的 MCE之间的 M2接口发送 , 或者通过 MME转发的方式发送。 所述 MBMS业务信息中至少包括: 所述 相邻小区的 MBSFN区域 ID。 此外, 还可以包括以下信息的一种或几种: 所述相邻小区发送的 MBMS业务的标识列表、 所述相邻小区发送 MBMS 业务的频点、 所述相邻小区已经停止发送的 MBMS业务的标识列表、 所述 相邻小区计划发送的 MBMS业务的标识列表。 具体的, 所述 MBMS业务 的标识列表可以是下列信息中的一种或多种: MBMS Service ID、 MBMS Session ID , TMGI(Temporary Mobile Group Identity, 临时移动群号), LCID(Logical Channel Identity, 逻辑信道号)。 所述相邻小区的 eNB收到源 小区的 eNB发送的 MBMS业务信息请求之后, 所述相邻小区的 eNB将其
控制下的相邻小区的 MBMS业务信息发送给源小区的 eNB。 所述 MBMS 业务信息首选为相邻小区的 MBSFN区域 ID。 除此之外, 还可以反馈该小 区提供的 MBMS业务的标识列表, 和 /或提供这些 MBMS业务的频率, 以 及其他可以标识该小区 MBSFN区域和所提供 MBMS业务的信息。 如果相 邻小区不能提供 MBMS业务, 则反馈其 MBMS业务信息为空或不反馈。 当前源小区的 eNB收到空反馈或没有收到反馈时, 则可以认为所述相邻小 区不能提供 MBMS业务。
进一步的, 具体实施中也可以在 MBMS 业务请求中发送源小区的 MBMS业务信息, 所述相邻小区的 eNB收到后发现与自身的 MBMS业务 信息相同, 则反馈一个肯定的指示符; 如果不一样, 则反馈一个否定的指 示符或不反馈。
需要特殊说明的是,所述 MBMS业务信息请求的发送涉及到通过 MCE 完成时, 即 MCE作为所述 MBMS业务信息请求的接收方时, 则有: MCE 收到源小区的 eNB发送的 MBMS业务信息请求后, 查询所述相邻小区的 MBMS 业务信息, 可以是 MBSFN 区域 ID 或其他可以标识所述小区的 MBSFN区域和提供 MBMS业务的信息, 然后将这些信息发送给源小区的 eNB。如果所述相邻小区与源小区属于同一 MBSFN区域, 则通过直接查询 就可以得到其 MBMS业务信息; 如果不属于同一 MBSFN区域, 则必需通 过所属 MCE去查询其他的 MCE。 实际上, 如果不属于同一 MBSFN区域, 则可以反馈相邻小区的 MBMS业务信息为空或不反馈, 这样, 源小区就可 以知道目标的相邻小区与自己不在同一 MBSFN区域之内。进一步的, MCE 也可以查找所述相邻小区是否与源小区属于同一 MBSFN区域,如果是,则 反馈一个肯定的指示符, 如 1 ; 如果否, 则反馈 0或不反馈。 更进一步的, 可以根据源小区发送的邻小区列表, 直接反馈与源小区属于同一 MBSFN 的相邻小区对应的索引或 bitmap指示。 当然, 具体的反馈内容取决于所述
MBMS业务信息请求的内容, 一般工程人员可以很容易的构造出很多种方 法, 此处不再赘述。
步驟 203 , 源小区的控制网元根据接收到的 MBMS业务信息, 为 UE 选择切换的目标小区。
具体的, 所述选择切换的目标小区具体为: 综合考虑相邻小区的信号 质量、 负载状况和 MBMS业务信息进行选择, 选择能够为 UE提供与源小 区相同 MBMS业务, 且信号质量和组在状况最好的相邻小区座位切换的目 标小区。
优选的, 所述切换的目标小区是指按照以下原则, 即步驟选定的小区: 步驟 203a, 综合考虑相邻小区的信号质量和负载程度, 并进行排序; 具体的, 所述排序的原则为: 优先选择相邻小区信号质量好, 以及负 载程度良好的小区。
步驟 203b, 在上述排序的基础上, 优先选择与 UE的源小区 MBMS业 务信息一致的小区作为所述切换的目标小区。
具体的, 所述信息一致是指相邻小区的 MBSFN 区域与所述源小区的 MBSFN 区域相同, 或者相邻小区的多个 MBSFN 区域中包含当源小区的 MBSFN区域, 或者相邻小区的 MBSFN区域, 与源小区为 UE提供 MBMS 业务的 MBSFN区域相同;或者相邻小区提供,与 UE在源小区接收的 MBMS 业务相同的业务。
进一步的, 也可以扩展上述原则为: 在相邻小区中选择信号质量较好 和负载程度良好的小区, 形成新的小区列表; 从上述小区列表中优先选择 与 UE的当前小区 MBMS业务信息一致的小区作为所述条件合适的小区; 当符合条件的小区有多个时, 按照现有的单播切换的条件选择其中一个小 区作为目标小区即可。 前述虽然对选择切换的目标小区的原则进行了说明, 但并不限定于此。 其基本原则在于, 在保证单播连续性的基础上, 尽量保
证 MBMS业务的连续性。
图 3 为本发明确定用户设备切换的目标小区的实施例一的方法流程示 意图, 如图 3所示: 所述方法包括:
步驟 301 , 源 eNB控制 UE测量, UE上报所有满足 UE测量门限的相 邻小区列表;
具体的, UE测量门限要求根据现有协议的规定执行。 所有满足 UE测 量门限的小区,都可以作为 UE切换的备选目标。 所述源 eNB是指控制 UE 当前所在源小区的 eNB。
步驟 302, UE的源 eNB向满足测量门限要求的相邻小区的 eNB发送 MBMS业务信息请求;
具体的,所述满足测量门限要求的相邻小区,是指 UE测量后上报的相 邻小区列表中的小区。 当所述相邻小区的 eNB与源小区的 eNB属于同一个 eNB, 即同一个网元时, 或者 UE的源 eNB的邻小区列表中包含所述相邻 小区的 MBMS业务信息时,只需要通过查找源 eNB就可获知所述相邻小区 的 MBMS业务信息, 因此不需要采用本发明的发送所述 MBMS业务信息 请求。 对于所述相邻小区中与当前小区不属于同一个 eNB, 且源 eNB的邻 小区列表中不包含该小区的 MBMS业务信息时, 则只需要向该相邻小区的 eNB发送所述 MBMS业务信息请求。
其中, 源 eNB可以通过 X2接口上的信令发送所述业务信息请求, 具 体实施中既可以在现有的信令中增加新的 IE, 也可以采用新的信令来发送 所述业务信息请求。 本实施例优选采用新的信令来发送所述 MBMS业务信 息请求, 如 MBMS Status Request message, 可以采用带反馈的消息, 也可 以采用不带反馈的。本实施例优选带反馈的消息,其反馈信息可以是 MBMS Status Request Acknowledge message。 具体的, 所述 MBMS业务信息请求, 可以不包含当前小区的 MBMS业务信息, 仅指示所有满足条件的相邻小区
的 eNB反馈所述相邻小区的 MBMS业务信息; 也可以包含自身的 MBMS 业务信息,指示所有满足条件的相邻小区的 eNB反馈与当前小区的 MBMS 业务信息是否一致, 一致的话则反馈肯定的指示符, 如 "1" , 否则反馈否 定的指示符, 如 "0" ; 还可以更进一步的包括需要切换的 UE正在接收的 MBMS业务的相关信息, 例如: 所属的 MBSFN区域 ID、 MBMS业务 ID, 和 /或其他可以标识该小区 MBMS 业务的信息等。 如果所述相邻小区的 MBMS业务信息与所述源小区的 MBMS业务信息请求中的信息一致,则反 馈肯定的指示符, 否则反馈否定的指示符。 当然, 上述方法只是一些较好 的方法,还可以在所述 MBMS业务信息请求中以其他形式来发送这些请求, 并要求所述请求的相邻小区以相对应的方式反馈。
此外 ,如果源 eNB和所述相邻小区的 eNB之间没有直接的 X2接口时, 可以通过转发方式来发送所述请求。 转发方式包括: 源 eNB通过 MME和 S1接口将所述请求发送给所述相邻小区的 eNB;或者先通过与其他 eNB的 X2 口发送到其他 eNB, 然后再通过该 eNB与相邻小区的 eNB之间的 X2 口发送到所述相邻小区的 eNB; 或者先通过 M2、 M3接口发送到 MME和 多播网关, 然后再发送给所述相邻小区的 eNB等。 进一步也可以采用其他 的网元来转发, 或者在多个网络实体间转发多次。 同样的, 可以采用上述 接口中的信令来发送这些请求, 既可以在现有的信令中增加新的 IE, 也可 以通过新的信令发送。
步驟 303 , 满足测量门限要求的相邻小区的 eNB向 UE的源 eNB发送 所述相邻小区的 MBMS业务信息;
其中, 所述 MBMS业务信息是指相邻小区所属的 MBSFN区域 ID。 此 外, 还可以包括以下信息的一种或多种: 小区发送的 MBMS业务的标识列 表、 发送 MBMS业务的频点、 曾经发送但现在停止发送的 MBMS业务的 标识列表、 即将发送的 MBMS业务的标识列表等。此外,也可以根据需求,
发送其他与 MBMS业务相关的信息。 当然, 如同步驟 302中所述, 根据发 送请求的不同, 可以采用相应的反馈来说明自身的 MBMS业务信息。
同样的,满足门限要求的相邻小区的 eNB在与所述的 MBMS业务信息 请求同样的信道或接口上发送自身的 MBMS业务信息。 具体的, 是指通过 X2接口或转发方式发送自身的 MBMS业务信息。 具体的, 转发方式包括: 满足门限要求的相邻小区的 eNB将所述小区的 MBMS业务信息通过 MME 和 S1接口发送给 UE的源 eNB; 或者, 满足门限要求的相邻小区的 eNB将 所述小区的 MBMS业务信息通过 X2口发送到其他临近的 eNB, 再由该临 近的 eNB通过 X2口将该信息发送给 UE的源 eNB; 或者, 满足门限要求 的相邻小区的 eNB也可以通过 MCE和 MBMS网关上的 M2、 M3接口将自 身的 MBMS业务信息发送给 UE的源 eNB等。 当然, 上述仅是其中一些优 选的方式, 也可以通过其他网元或接口将所述邻小区 MBMS业务信息发送 给 UE的源 eNB。
具体的, 所述 MBMS业务信息可以通过 X2接口或转发方式中的接口 上的信令发送给 UE当前小区。所述信令可以是现有的信令,在其中增加新 的 IE信息; 也可以是新的信令。 具体的接口或发送方式, 以及承载该信息 的信令, 根据所述 MBMS业务信息请求所在的接口或发送方式以及其承载 信令来确定。
步驟 304, UE的源 eNB从所述相邻小区中选择条件合适的小区, 作为 UE切换的目标小区。
优选的, 所述条件合适的小区是指按照以下原则选定的小区: 综合考 虑相邻小区的信号质量和负载程度, 并进行排序;在上述排序的基础上, 优 先选择与 UE的当前小区 MBMS业务信息一致的小区作为所述条件合适的 小区。 当然, 也可以进一步扩展上述原则为: 在相邻小区中选择信号质量 较好和负载程度良好的小区, 形成新的小区列表; 从上述小区列表中优先
选择与 UE的当前小区 MBMS业务信息一致的小区作为所述条件合适的小 区。
对于相邻小区的 MBSFN区域超过一个的情况, 只要其中包含有与 UE 的当前小区的 MBSFN区域相同, 则认为该小区与 UE的当前小区 MBMS 业务信息一致。对于 UE的当前小区的 MBSFN区域超过一个的情况, 则只 有相邻小区的 MBSFN区域与 UE在当前小区接收的 MBMS业务的 MBSFN 区域相同, 才认为该小区与 UE的当前小区 MBMS业务信息一致。
上述对合适的小区进行了说明, 但并不限定于此。 其基本原则在于, 在保证单播连续性的基础上, 尽量保证 MBMS业务的连续性。 此外, 也可 以先选取一些能提供 MBMS业务连续性的邻小区, 然后再按单播小区的处 理方式, 来选择合适的小区作为目标小区。 这样的话, 当能提供 MBMS业 务连续性的相邻小区较少时, 有可能会导致单播业务的不连续。 因此, 这 种方式不作为本发明最优选的方式, 只是作为一种可能的实现方式。
进一步的, 步驟 304之后, 源 eNB控制 UE向目标小区发起切换过程, 切换到目标小区, 并在目标小区继续接收 MBMS业务。 采用上述方法的好 处是: 能尽可能的提高 UE的 MBMS业务的连续性, 提高了用户体验。 而 且, 一般来说, 各小区的 eNB间的 X2接口都是存在的, 通过 X2接口传送 所述相邻小区的 MBMS业务信息, 比较容易实现, 而且 X2口上的资源也 相对充裕。 此外, 采用该实施例的方法提高 MBMS业务的连续性, 不会对 小区的单播业务的连续接收造成影响, 具有较好的标准化和实用价值。
图 4为本发明确定用户设备切换的目标小区的实施例二的方法流程示 意图, 如图 4所示: 所述方法包括:
步驟 401 , 网络侧控制 UE测量, UE上报所有满足 UE测量门限的相 邻小区列表;
其中, UE的测量门限根据当前规范的规定确定。 UE测量, 包括配置
测量间隔的测量和无测量间隔的测量, 具体配置取决于网络的配置。 所述 网络, 是指控制 UE测量的网元, 具体的, 可以是控制该 UE的当前小区的 eNB, 即源 eNB。 也可以是控制该 UE的源 eNB的 MCE或 MME。
步驟 402, UE的源 eNB向 MCE发送所述相邻小区 MBMS业务信息请 求;
具体的,所述相邻小区是指 UE上报的满足测量门限的相邻小区。更进 一步, 该相邻小区与当前源小区不属于同一个 eNB, 和 /或 UE的源 eNB的 邻小区列表中不包含所述邻小区的 MBMS业务信息。
优选的, 所述 MBMS业务信息是指相邻小区的 MBSFN区域 ID。 更进 一步的, 所述 MBMS业务信息还可以包括以下信息的一种或多种: 相邻小 区发送的 MBMS业务的标识列表、 发送 MBMS业务的频点、 曾经发送但 现在停止发送的 MBMS业务的标识列表、 即将发送的 MBMS业务的标识 列表等可以标识其 MBMS业务的信息。
UE的源 eNB收到 UE上报的所述相邻 '〗、区列表后 ,通过 M2接口上的 信令向 MCE发送所述 MBMS业务信息请求。 具体的, 可以通过在原有信 令上增加 IE的方式, 也可以通过新的信令发送所述 MBMS业务信息请求。 此外, 如果当前小区和 MCE之间没有直接的 M2接口, 则可以采用转发方 式发送所述 MBMS 业务信息请求。 具体的, 当前小区可以将所述 MBMS 业务信息请求发送给其他 eNB , 由其他 eNB通过 M2接口转发给 MCE。 当 然, 也可以采用其他的网元或接口将所述 MBMS 业务信息请求发送给 MCE。 此时, 通过所述转发方式涉及的接口上的信令来传送所述 MBMS业 务信息请求, 既可以在现有信令上的增加 IE, 也可以通过新的信令来发送 所述 MBMS业务信息请求。
具体的,所述 MBMS业务信息请求,可以仅包含所述相邻小区的列表, MCE根据列表反馈所述相邻小区的 MBMS业务信息。 当然, 也可以将当
前小区的 MBMS业务信息和所述相邻小区列表发送给 MCE, MCE查询哪 些小区与当前小区的 MBMS业务信息一致, 则将该小区信息反馈给当前小 区。 更进一步的, 只要能使得 UE的源 eNB获知所述相邻小区的 MBMS业 务信息, 其他的约定方式也可以采用。
步驟 403 , MCE根据所述请求, 向 UE的源 eNB发送所述相邻小区的 MBMS业务信息;
具体的, MCE收到 UE的源 eNB发送的 MBMS业务信息请求后, 直 接查找所述相邻小区的 MBMS业务信息,通过 M2接口上的信令发送给 UE 的源 eNB; 也可以向其他 MCE或 MBMS网关查询所述相邻小区的 MBMS 业务信息, 通过 M2接口上的信令发送给 UE的当前小区的 eNB。 实际上, 如果相邻小区与当前小区属于同一 MBSFN区域,即相邻小区的 MBSFN区 域 ID与当前小区的 MBSFN区域 ID相同,则在当前小区的 MCE中能查询 到该小区的 MBMS业务能力; 如果在当前小区的 MCE中查询不到所述相 邻小区的信息, 则可能该小区不属于当前小区所在的 MBSFN区域。
MCE可以根据源 eNB发送的 MBMS业务信息请求, 以相应的方式向 当前小区反馈所述相邻小区的 MBMS业务信息。例如, 当前小区的 eNB将 所述邻 d、区列表包含在所述 MBMS业务信息请求中发给 MCE , 则 MCE将 所述相邻小区的 MBMS业务信息反馈给当前小区的 eNB。如果列表中一些 相邻小区在该 MCE无法查到, 则可以反馈为空或不反馈, 也可以查询其他 MCE或 MBMS实体后再反馈。 查询其他 MCE或 MBMS实体时, 需要设 置相应的定时器, 超时则认为该小区不能提供 MBMS 业务。 当然, MCE 也可以只反馈所述邻小区列表是否属于当前小区所在的 MBSFN区域,此时 只反馈一个指示符即可。 一般情况下, 同一个 MBMS 业务只会在一个 MBSFN区域中发送, 而不会分散到多个 MBSFN区域, 因此只查找当前小 区的 eNB 所在的 MCE 即可。 对于可能分散到多个 MBSFN 区域发送的
MBMS业务,则可能需要查询其他 MCE所述相邻小区的 MBMS业务信息。 当然, 具体的 MCE反馈的 MBMS 业务信息, 需要根据当前小区发送的 MBMS业务信息请求的内容来确定, 工程技术人员可以不经过创造性劳动 构造出很多中形式来, 此处不再赘述。 承载所述 MBMS业务信息的信令, 既可以是现有的信令, 也可以采用新的信令。 具体的, 根据步驟 402 中所 述 MBMS业务信息请求所采用的信令形式确定。 当所述 MBMS业务信息 请求采用现有信令承载时, 则所述 MBMS业务信息也在相应的现有信令上 承载; 所述 MBMS业务信息请求采用新信令时, 则所述 MBMS业务信息 也在相应的新信令上承载。 其发送采用的网元和接口与步驟 402 中的方式 相同。 当步驟 402中采用 M2或 M3接口上的信令时, 所述 MBMS业务信 息也采用同样接口上的信令。 当步驟 402中采用转发方式时, 所述 MBMS 业务信息也同样采用转发方式。
步驟 404, UE的源 eNB根据相邻小区的信号质量、 负载状况和 MBMS 业务信息, 选择合适的小区作为 UE切换的目标小区。
优选的, 所述条件合适的小区是指按照以下原则选定的小区: 综合考 虑相邻小区的信号质量和负载程度, 并进行排序;在上述排序的基础上, 优 先选择与 UE的当前小区 MBMS业务信息一致的小区作为所述条件合适的 小区。
当然, 也可以进一步扩展上述原则为: 在相邻小区中选择信号质量较 好和负载程度良好的小区, 形成新的小区列表; 从上述小区列表中优先选 择与 UE的当前小区 MBMS业务信息一致的小区作为所述条件合适的小区。
对于相邻小区的 MBSFN区域超过一个的情况, 只要其中包含有与 UE 的当前小区的 MBSFN区域相同, 则认为该小区与 UE的当前小区 MBMS 业务信息一致。对于 UE的当前小区的 MBSFN区域超过一个的情况, 则只 有相邻小区的 MBSFN区域与 UE在当前小区接收的 MBMS业务的 MBSFN
区域相同, 才认为该小区与 UE的当前小区 MBMS业务信息一致。
上述对合适的小区进行了说明, 但并不限定于此。 其基本原则在于, 在保证单播连续性的基础上, 尽量保证 MBMS业务的连续性。 此外, 也可 以先选取一些能提供 MBMS业务连续性的邻小区, 然后再按单小区的处理 方式, 来选择合适的小区作为目标小区。 这样的话, 当能提供 MBMS业务 连续性的邻小区较少时, 有可能导致单播业务的不连续。 因此, 这种方式 不作为本发明优选的方式, 只是作为一种可能的实现方式。
进一步的, 步驟 304之后, 源 eNB可以控制 UE向目标小区发起切换, 从而使得 UE进入了目标小区后, 能继续接收感兴趣的 MBMS业务, 保证 了用户业务接收的连续性。 该实施例的好处是: 通过从 MCE查询满足 UE 测量条件的邻小区的 MBMS业务信息, 在保证单播业务连续性的基础上, 优先为 UE选择能提供 MBMS业务连续性的邻小区作为 UE切换的目标小 区, 提高了 UE接收 MBMS 业务时的连续性。 此外, 当前小区只需要向 MCE发送一次信令, 即可获得所需要的相邻小区的 MBMS业务信息, 减 轻了***的信令负担, 有较好的实用价值。
图 5 为本发明一种确定用户设备切换的目标小区的***流程示意图, 如图 5所示, 所述***包括: 源小区的控制网元 51和相邻小区的控制网元 52, 其中,
所述源小区的控制网元 51 , 用于向一个或多个相邻小区的控制网元 52 发送 MBMS业务信息请求, 根据接收到的 MBMS业务信息, 为源小区中 的 UE选择切换的目标小区;
具体的, 所述源小区的控制网元 51包括: eNB、 或 MCE、 或 MME。 所述源小区的控制网元 51为源小区中的 UE选择切换的目标小区, 包括: 所述源小区的控制网元 51选择能够为 UE提供与源小区相同 MBMS业务, 且信号质量和组在状况最好的相邻小区座位切换的目标小区。 所述 MBMS
业务信息请求, 包括: 在现有的消息上增加新的 IE, 或通过新建消息作为 MBMS业务信息请求; 所述 MBMS业务信息请求, 包括: 通过 eNB之间 的 X2接口发送, 或者通过 eNB所属的 MCE之间的 M2接口, 或者通过 MME转发的方式发送。
其中, UE所在源小区的控制网元 51 , 即源 eNB接收到 UE发送的满 足测量条件的邻小区列表后, 查询自身的邻小区列表, 当其中不包含所述 相邻小区的 MBMS业务信息时,则向一个或多个所述相邻小区的 eNB通过 PTP或 PTM方式发送 MBMS业务信息请求, 要求所述相邻小区的 eNB向 当前 eNB反馈其 MBMS业务信息, 例如: 该小区是否提供 MBMS业务, 属于哪一个 MBSFN 区域, 提供哪些 MBMS业务等信息等。 所述 MBMS 业务信息请求的发送方式包括: 通过 eNB之间的 X2接口发送, 或者通过 eNB所属的 MCE之间的 M2接口, 或者通过转发的方式发送。 其中, 所述 转发的方式具体包括: 当前 eNB与所述相邻小区的 eNB之间不存在直接的 X2接口的时候, 当前小区的 eNB通过 MME和 S 1接口将所述请求发送给 所述相邻小区的 eNB; 或者先通过与其他 eNB的 X2口发送到其他 eNB, 然后再通过该 eNB与相邻小区的 eNB之间的 X2口发送到所述相邻小区的 eNB; 或者先通过 M2接口发送到 MME, 然后再由 MME通过 M2接口发 送给所述相邻小区的 eNB; 或者在当前 eNB和 MCE之间不存在 M2接口 的时候, 通过与其他 eNB的 X2接口发送到其他小区的 eNB, 然后再通过 所述其他小区的 eNB与目标相邻小区的 MCE的 M2接口发送所述请求信息 等。 当然, 也可以采用其他的网元来转发, 或者在多个网元间转发多次。
所述相邻小区的控制网元 52, 用于接收到 MBMS业务信息请求后, 向 源小区的控制网元 51发送所述相邻小区的 MBMS业务信息。
具体的, 所述相邻小区的控制网元 52包括: eNB、 或 MCE、 或 MME。 所述相邻小区的控制网元 52发送的 MBMS业务信息包括: 所述相邻小区
的 MBSFN区域 ID。 此外, 还可以包括以下信息的一种或几种: 所述相邻 小区发送的 MBMS业务的标识列表、 所述相邻小区发送 MBMS业务的频 点、 所述相邻小区已经停止发送的 MBMS业务的标识列表、 所述相邻小区 计划发送的 MBMS业务的标识列表。 所述 MBMS业务信息, 包括: 在现 有的消息上增加新的 IE, 或通过新建消息作为 MBMS 业务信息; 所述 MBMS业务信息的发送方式包括: 通过 eNB之间的 X2接口发送, 或者通 过 eNB所属的 MCE之间的 M2接口, 或者通过 MME转发的方式发送。
其中, 所述相邻小区的控制网元 52 , 即 eNB收到源小区的 eNB发送 的 MBMS业务信息请求之后,所述相邻小区的 eNB将其控制下的相邻小区 的 MBMS业务信息发送给源小区的 eNB。 所述 MBMS业务信息首选为相 邻小区的 MBSFN区域 ID。 除此之外, 还可以反馈该小区提供的 MBMS业 务的标识列表, 和 /或提供这些 MBMS业务的频率, 以及其他可以标识该小 区 MBSFN 区域和所提供 MBMS 业务的信息。 如果相邻小区不能提供 MBMS业务,则反馈其 MBMS业务信息为空或不反馈。 当前源小区的 eNB 收到空反馈或没有收到反馈时, 则可以认为所述相邻小区不能提供 MBMS 业务。
进一步的, 具体实施中也可以在 MBMS 业务请求中发送源小区的 MBMS业务信息, 所述相邻小区的 eNB收到后发现与自身的 MBMS业务 信息相同, 则反馈一个肯定的指示符; 如果不一样, 则反馈一个否定的指 示符或不反馈。
需要特殊说明的是,所述 MBMS业务信息请求的发送涉及到通过 MCE 完成时, 即 MCE作为所述 MBMS业务信息请求的接收方时, 则有: MCE 收到源小区的 eNB发送的 MBMS业务信息请求后, 查询所述相邻小区的 MBMS 业务信息, 可以是 MBSFN 区域 ID 或其他可以标识所述小区的 MBSFN区域和提供 MBMS业务的信息, 然后将这些信息发送给源小区的
eNB。 如果所述相邻小区与源小区属于同一 MBSFN区域, 则通过直接查询 就可以得到其 MBMS业务信息; 如果不属于同一 MBSFN区域, 则必需通 过所属 MCE去查询其他的 MCE。 实际上, 如果不属于同一 MBSFN区域, 则可以反馈相邻小区的 MBMS业务信息为空或不反馈, 这样, 源小区就可 以知道目标的相邻小区与自己不在同一 MBSFN区域之内。进一步的, MCE 也可以查找所述相邻小区是否与源小区属于同一 MBSFN区域,如果是,则 反馈一个肯定的指示符, 如 1 ; 如果否, 则反馈 0或不反馈。 更进一步的, 可以根据源小区发送的邻小区列表, 直接反馈与源小区属于同一 MBSFN 的相邻小区对应的索引或 bitmap指示。 当然, 具体的反馈内容取决于所述 MBMS业务信息请求的内容, 一般工程人员可以很容易的构造出很多种方 法, 此处不再赘述。
以上所述, 仅为本发明的较佳实施例而已, 并非用于限定本发明的保 护范围。
Claims
1、 一种确定用户设备(UE )切换的目标小区的方法, 其特征在于, 所 述方法, 包括:
UE所在源小区的控制网元, 向一个或多个相邻小区的控制网元发送多 媒体广播多播服务(MBMS )业务信息请求;
相邻小区的控制网元向源小区的控制网元发送所述相邻小区的 MBMS 业务信息;
源小区的控制网元根据接收到的 MBMS业务信息, 为 UE选择切换的 目标小区。
2、 根据权利要求 1所述的方法, 其特征在于, 所述控制网元, 包括: 演进型基站 (eNB )、 或多小区 /多播协作实体 (MCE )、 或移动管理实体
( MME I
3、 根据权利要求 1或 2所述的方法, 其特征在于, 所述选择切换的目 标小区, 包括: 选择能够为 UE提供与源小区相同 MBMS业务, 且信号质 量和负载状况最好的相邻小区作为切换的目标小区。
4、 根据权利要求 1或 2所述的方法, 其特征在于, 所述 MBMS业务 信息, 包括: 所述相邻小区的多播单频网 (MBSFN ) 区域 ID, 此外还包括 以下信息的一种或几种: 所述相邻小区发送的 MBMS业务的标识列表、 所 述相邻小区发送 MBMS业务的频点、所述相邻小区已经停止发送的 MBMS 业务标识列表、 所述相邻小区计划发送的 MBMS业务标识列表。
5、 根据权利要求 1或 2所述的方法, 其特征在于, 所述 MBMS业务 信息请求或所述 MBMS业务信息, 包括: 在现有的消息上增加新的信息单 元( IE ), 或新建消息作为 MBMS业务信息请求或 MBMS业务信息;
所述发送 MBMS业务信息请求或所述发送 MBMS业务信息, 包括: 通过源小区和相邻小区的 eNB之间的 X2接口发送, 或者通过源小区和相 邻小区的 eNB所属的 MCE之间的 M2接口发送,或者通过 MME转发的方 式发送。
6、 一种确定用户设备切换的目标小区的***, 其特征在于, 所述*** 包括: 源小区的控制网元和相邻小区的控制网元, 其中,
所述源小区的控制网元, 用于向一个或多个相邻小区的控制网元发送
MBMS业务信息请求, 根据接收到的 MBMS业务信息, 为源小区中的 UE 选择切换的目标小区;
所述相邻小区的控制网元, 用于接收到 MBMS业务信息请求后, 向源 小区的控制网元发送所述相邻小区的 MBMS业务信息。
7、 根据权利要求 6所述的***, 其特征在于, 所述源小区的控制网元 或所述相邻小区的控制网元, 包括: eNB、 或 MCE、 或 MME。
8、 根据权利要求 6或 7所述的***, 其特征在于, 所述源小区的控制 网元选择切换的目标小区, 包括: 所述源小区的控制网元选择能够为 UE 提供与源小区相同 MBMS业务, 且信号质量和负载状况最好的相邻小区作 为切换的目标小区。
9、 根据权利要求 6或 7所述的***, 其特征在于, 所述相邻小区的控 制网元发送的 MBMS业务信息 , 包括: 所述相邻小区的 MBSFN区域 ID, 此外还包括以下信息的一种或几种: 所述相邻小区发送的 MBMS业务的标 识列表、 所述相邻小区发送 MBMS业务的频点、 所述相邻小区已经停止发 送的 MBMS业务的标识列表、 所述相邻小区计划发送的 MBMS业务的标 识列表。
10、 根据权利要求 6或 7所述的***, 其特征在于, 所述源小区的控 制网元发送的 MBMS 业务信息请求或所述相邻小区的控制网元发送的 MBMS 业务信息, 包括: 在现有的消息上增加新的 IE, 或新建消息作为 MBMS业务信息请求或 MBMS业务信息; 所述源小区的控制网元发送 MBMS业务信息请求或所述相邻小区的控 制网元发送 MBMS业务信息 , 包括: 通过源小区和相邻小区的 eNB之间的 X2接口发送, 或者通过源小区和相邻小区的 eNB所属的 MCE之间的 M2 接口发送, 或者通过 MME转发的方式发送。
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