CN102685684B - A kind of method, system and user equipment for realizing MBMS service continuity - Google Patents
A kind of method, system and user equipment for realizing MBMS service continuity Download PDFInfo
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Abstract
The invention discloses a kind of methods, system and user equipment for realizing MBMS service continuity, including：Network side sends the cell selection or gravity treatment relevant configuration information of multimedia broadcast multi-broadcasting business (MBMS) business；After Idle state user equipment (UE) receives cell selection or the gravity treatment relevant configuration information of MBMS business, select the neighboring community for belonging to the cell-of-origin of same frequency layer with the frequency for providing MBMS business in cell-of-origin as Target cell；The Idle state UE is moved to Target cell from cell-of-origin, and MBMS business is continued in Target cell or prepares to receive MBMS business.By means of the invention it is possible to realize the continuity of MBMS business.
Description
Technical Field
The present invention relates to Long Term Evolution (LTE) technologies, and in particular, to a method and system for implementing Multimedia Broadcast Multicast Service (MBMS) continuity.
Background
With the rapid development of the Internet and the popularization of large-screen multifunctional mobile terminals, a large number of mobile data multimedia services and various high-bandwidth multimedia services, such as video conferences, television broadcasts, video on demand, advertisements, online education, interactive games and the like, appear, which on one hand meets the multi-service requirements of mobile users and on the other hand brings new service growth points for mobile operators. These mobile data multimedia services require that multiple users can receive the same data at the same time, and compared with general data services, the mobile data multimedia services have the characteristics of large data volume, long duration, time delay sensitivity and the like.
In order to efficiently utilize mobile network resources, the third generation partnership Project (3 GPP) proposes Multimedia Broadcast Multicast Service (MBMS). The MBMS service is a technology for transmitting data from one data source to a plurality of target mobile terminals, which realizes sharing of network (including core network and access network) resources and improves utilization rate of network resources (especially air interface resources). The MBMS service defined by 3GPP can not only implement plain text low-rate message multicast and broadcast, but also implement broadcast and multicast of high-speed multimedia service, and provide various rich video, audio, and multimedia services, which undoubtedly follows the development trend of future mobile data, and provides better service prospects for the development of 3G.
A user equipment (UE, or terminal) receiving an MBMS service may be in one of two states: one is RRC CONNECTED (RRC _ CONNECTED, simply CONNECTED); the other is an RRC IDLE state (RRC _ IDLE, abbreviated as IDLE state), and the present invention only researches UEs in the IDLE state. According to whether the UE is receiving the unicast service, whether the UE receiving the MBMS service is in a connected state or an idle state can be judged; when the UE receives the unicast service, the UE is in a connected state; the UE in idle state does not establish Radio Resource Control (RRC) connection with the network side, and the UE in connected state establishes RRC connection with the network side.
In the moving process, for idle-state UE, a cell selection or reselection process is generally used for entering a target cell; for a connected UE, a cell handover procedure is typically used to enter a target cell.
If the UE has a MBMS service being received in the source cell, after the UE enters the target cell, the UE reads messages of a Broadcast Control CHannel (BCCH) and a Multicast Control CHannel (MCCH) to acquire resource configuration information of the MBMS service in the target cell. If the target cell and the source cell belong to the same MBMS Single Frequency Network (MBSFN) area, namely: the target cell and the source cell both belong to the MBSFN area, and the MBMS is already transmitted in the target cell, so that the UE can receive the MBMS in the target cell by directly using the resource configuration information of the MBMS in the source cell (current cell) without reading the resource configuration information of the MBMS after entering the target cell, thereby realizing the continuity of the MBMS; if the target cell and the source cell belong to different MBSFN areas, the UE needs to read the resource configuration information of the MBMS after entering the target cell; if the MBMS service that the UE needs to receive in the target cell is not transmitted, the UE cannot read the resource configuration information of the MBMS service after entering the target cell, and cannot receive the MBMS service.
The receiving state of the UE with the MBMS service capability comprises the following steps: is receiving MBMS services and is interested in receiving MBMS services. The interest in receiving the MBMS service means that the UE does not receive the MBMS service yet and is ready to receive the MBMS service, at the moment, the UE monitors the MBMS notification message in the MBSFN area and further reads the MCCH message and the MBMS service data according to the MBMS notification message. For the MBMS service interested in receiving, if the MBMS service has not started to be transmitted, the UE generally does not know the correspondence between the MBMS service and the MBSFN area.
An operator can deploy multiple frequency points (frequency points refer to the center frequency and bandwidth of a frequency band) in a network, and an existing MBMS service is generally transmitted in an MBSFN manner, so that the MBMS service is generally deployed on a certain frequency point which is continuously covered, that is, in an MBSFN area, the MBMS service is transmitted at a certain frequency.
In the MBSFN area, if the number of UEs receiving or interested in receiving the MBMS service is small, the MBMS service may be transmitted in a point-to-point (PTP) manner, and at this time, the Radio Access Network (RAN) side does not know that the MBMS service is transmitted by unicast.
Cell selection or reselection belongs to mobility in an idle state of the UE. The cell selection comprises: initial cell selection, return from connected state to idle state, and re-entry into service. Cell selection involves the UE searching for the strongest cell on each carrier frequency in each supported RAT until a suitable cell is found. When leaving the connected mode, the UE typically selects a cell to which it was connected, however, the connection release message may contain information instructing the UE to search for cells on a particular frequency; when the UE finds that no suitable cell exists in the selected PLMN, the UE performs 'any cell search', and in this state, the UE is not allowed to receive the MBMS service.
The purpose of cell selection or reselection is to ensure that idle UEs camp on the best cell. Cell selection or reselection is a necessary procedure in a wireless network, mainly due to the mobility of UEs and the fluctuation of the wireless environment, thereby causing fluctuations in signal strength and interference level. In LTE, the network side may set up 8 different priorities at most for different frequencies, and the idle UE performs cell selection or reselection according to the order of the frequency priorities, and when the frequency priorities are the same, the UE performs cell selection or reselection according to the ranking of the wireless channel quality.
As a basic principle, each terminal evaluates cell selection or reselection criteria using its own radio measurements (e.g., received beacon channel level) and network-provided parameters (e.g., threshold values) as well as some system information. For a multimode terminal in an environment providing multiple access technologies, the terminal needs to evaluate reselection criteria using measurements from different available frequencies and access technologies.
The network controls the parameters used by the reselection criteria to allow the UE in the idle state to be moved to the most relevant network layer, depending on the network needs.
During the research and practice of the prior art, the following problems are found in the prior art: for idle-state UE, when it selects a target cell by using a unicast cell selection or reselection process, the reception of the MBMS service is not considered, the selected target cell may not provide the MBMS service that the UE is receiving or interested in receiving, and the reception of the MBMS service is interrupted after the UE enters the target cell, so that the continuity of receiving the MBMS service by the idle-state UE is not well guaranteed, and the user service experience is affected.
Disclosure of Invention
In view of the above, the main objective of the present invention is to provide a method, a system and a user equipment for implementing MBMS service continuity, so as to solve the problem of discontinuous reception of MBMS service by a UE due to idle UE mobility and radio environment fluctuation.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the invention provides a method for realizing MBMS service continuity, which comprises the following steps:
a network side sends cell selection or reselection related configuration information of a Multimedia Broadcast Multicast Service (MBMS) service;
after receiving the cell selection or reselection related configuration information of the MBMS, idle User Equipment (UE) selects a cell adjacent to a source cell which belongs to a same frequency layer with the frequency of providing the MBMS in the source cell as a target cell;
and the idle state UE moves from the source cell to the target cell and continuously receives the MBMS service or prepares to receive the MBMS service in the target cell.
Wherein, the cell selection or reselection related configuration information of the MBMS service includes: providing at least one of frequency point information of the MBMS service, MBMS single frequency network (MBSFN) area identification indication of the adjacent cells, a frequency list of the different-frequency adjacent cells and cell selection or reselection parameters.
The frequency point information for providing the MBMS, the frequency list of the pilot frequency adjacent cells and the cell selection or reselection parameters are provided for the UE by a network side through system information and Radio Resource Control (RRC) signaling.
The MBSFN area identifier indication of the neighboring cell includes: MBSFN area identification of adjacent cells and/or indication information bits of the same MBSFN area;
the MBSFN area identity of the neighboring cell indicates interaction between a source cell base station (eNB) and a neighboring cell eNB and is provided to the UE by the source cell; alternatively, the MBSFN area identity indication of the neighboring cell is provided to the UE by a source cell according to a multi-element/Multicast Coordination Entity (MCE) indication.
The cell selection or reselection parameters include at least: a cell selection or reselection threshold value, a frequency priority, and a time parameter.
The selecting, as the target cell, a cell adjacent to a source cell having a frequency of providing the MBMS service on a same frequency layer as a source cell includes: the UE sets the frequency of providing the MBMS service in the source cell as the highest priority; the UE determines an adjacent cell of a source cell belonging to a same frequency layer with the frequency as a same frequency adjacent cell; and the UE selects a target cell from the same-frequency adjacent cells.
When selecting the target cell, the method further comprises:
the UE determines a cell which can provide the MBMS service in the same-frequency adjacent cells;
the UE determines a cell which has the same MBSFN area identification with a source cell in the same-frequency adjacent cells capable of providing the MBMS;
and the UE selects the cell with the best radio channel quality as a target cell from the same-frequency adjacent cells with the same MBSFN area identification as the source cell.
When selecting the target cell, the method further comprises:
the UE determines a cell which can provide the MBMS service in the same-frequency adjacent cells;
and the UE selects the cell with the best radio channel quality as a target cell from the adjacent cells with the same frequency capable of providing the MBMS.
After the idle-state UE moves from the source cell to the target cell, the method further includes:
when the UE is determined to be in a state of receiving the MBMS service in a source cell and the target cell contains the MBMS service which is being received or is interested in being received by the UE, the UE continues to receive the MBMS service in the target cell;
when the UE is determined to be in the state of interested in receiving the MBMS service in a source cell and the target cell contains the MBMS service which is being received or is interested in receiving by the UE, the UE monitors notification information of a Multicast Control Channel (MCCH) to prepare for receiving the MBMS service.
After the idle UE receives the cell selection or reselection related configuration information of the MBMS service, the method further includes: and the UE receives the cell selection or reselection related configuration information of the MBMS and determines to perform cell selection or reselection when the measurement results of the UE on the source cell and the adjacent cell meet specific search or measurement standards.
The invention also provides a system for realizing MBMS service continuity, which comprises:
a sending module, configured to send cell selection or reselection related configuration information of an MBMS service;
a receiving module, configured to receive cell selection or reselection related configuration information of the MBMS service;
a selection module, configured to select, after the receiving module receives the cell selection or reselection related configuration information of the MBMS service, a cell adjacent to a source cell in which a frequency providing the MBMS service in the source cell belongs to a common frequency layer as a target cell;
the switching module is used for moving the idle-state UE from the source cell to the target cell;
and the service module is used for enabling the idle-state UE to continuously receive the MBMS service or prepare to receive the MBMS service in the target cell.
The selection module is further configured to set a frequency for providing the MBMS service in the source cell to a highest priority when determining to perform cell selection or reselection; and determining an adjacent cell of a source cell belonging to a same frequency layer with the frequency as a same frequency adjacent cell; and selecting a target cell from the same-frequency adjacent cells.
The selection module is further configured to determine a cell that can provide the MBMS service in the same-frequency neighboring cells; determining a cell which has the same MBSFN area identification with a source cell in the same-frequency adjacent cells capable of providing the MBMS; selecting a target cell with the best radio channel quality from the same-frequency adjacent cells with the same MBSFN area identification as the source cell; or,
the selection module is further configured to determine a cell that can provide the MBMS service in the same-frequency neighboring cells; and selecting the target cell with the best radio channel quality from the same-frequency adjacent cells capable of providing the MBMS service.
The service module is further configured to, after the idle-state UE moves from a source cell to a target cell, determine that the UE is in a state of receiving an MBMS service in the source cell and determine that the target cell includes the MBMS service that the UE is receiving or is interested in receiving, enable the UE to continue receiving the MBMS service in the target cell;
the service module is further configured to, after the idle-state UE moves from a source cell to a target cell, when it is determined that the UE is in an MBMS service reception state interested in the source cell and when it is determined that the target cell includes an MBMS service which the UE is receiving or is interested in receiving, enable the UE to monitor MCCH notification information to prepare for receiving the MBMS service.
The invention also provides a user equipment for realizing MBMS service continuity, which comprises:
a receiving module, configured to receive cell selection or reselection related configuration information of an MBMS service sent by a network side;
a selection module, configured to select, after receiving cell selection or reselection related configuration information of the MBMS service, a neighboring cell of a source cell that belongs to a same frequency layer as a frequency providing the MBMS service in the source cell as a target cell;
the switching module is used for moving the idle-state UE from the source cell to the target cell;
and the service module is used for enabling the idle-state UE to continuously receive the MBMS service or prepare to receive the MBMS service in the target cell.
The selection module is further configured to set a frequency for providing the MBMS service in the source cell to a highest priority when determining to perform cell selection or reselection; and determining an adjacent cell of a source cell belonging to a same frequency layer with the frequency as a same frequency adjacent cell; and selecting a target cell from the same-frequency adjacent cells.
The selection module is further configured to determine a cell that can provide the MBMS service in the same-frequency neighboring cells; determining a cell which has the same MBSFN area identification with a source cell in the same-frequency adjacent cells capable of providing the MBMS; selecting a target cell with the best radio channel quality from the same-frequency adjacent cells with the same MBSFN area identification as the source cell; or,
the selection module is further configured to determine a cell that can provide the MBMS service in the same-frequency neighboring cells; and selecting the target cell with the best radio channel quality from the same-frequency adjacent cells capable of providing the MBMS service.
The service module is further configured to, after the idle-state UE moves from a source cell to a target cell, determine that the UE is in a state of receiving an MBMS service in the source cell and determine that the target cell includes the MBMS service that the UE is receiving or is interested in receiving, enable the UE to continue receiving the MBMS service in the target cell;
the service module is further configured to, after the idle-state UE moves from a source cell to a target cell, when it is determined that the UE is in an MBMS service reception state interested in the source cell and when it is determined that the target cell includes an MBMS service which the UE is receiving or is interested in receiving, enable the UE to monitor MCCH notification information to prepare for receiving the MBMS service.
In the implementation scheme of the MBMS service continuity, the idle-state UE receiving or interested in receiving the MBMS service sets the frequency of providing the MBMS service in a source cell as the highest priority, so that the idle-state UE preferentially selects a cell which can provide the MBMS service and belongs to the same frequency layer as the highest priority frequency as a target cell, thereby realizing the MBMS service continuity of the idle-state UE; in addition, if the target cell can not ensure the service continuity, the user is informed of the service interruption reason, so that the MBMS service experience of the user is improved.
Drawings
Fig. 1 is a schematic flow chart of a method for implementing MBMS service continuity according to the present invention;
fig. 2 is a flowchart illustrating a method for implementing MBMS service continuity according to an embodiment of the present invention;
fig. 3 is a flowchart illustrating a method for implementing MBMS service continuity according to a second embodiment of the present invention;
fig. 4 is a flowchart of a method for implementing MBMS service continuity according to a third embodiment of the present invention;
fig. 5 is a schematic diagram of a system structure for implementing MBMS service continuity according to the present invention;
fig. 6 is a schematic structural diagram of a user equipment for implementing MBMS service continuity according to the present invention.
Detailed Description
The technical solution of the present invention is further elaborated below with reference to the drawings and the specific embodiments.
The method for realizing MBMS service continuity of the invention is shown in figure 1, and comprises the following steps:
step 101, a network side sends cell selection or reselection related configuration information of an MBMS service;
102, after receiving the cell selection or reselection related configuration information of the MBMS, the idle UE selects a neighboring cell of a source cell which belongs to a same frequency layer with the frequency of providing the MBMS in the source cell as a target cell;
step 103, the UE moves from the source cell to the target cell, and continues to receive the MBMS service or prepares to receive the MBMS service in the target cell.
In order to meet the requirement of continuity of MBMS service reception by UE, the invention sets a corresponding cell selection or reselection criterion, which comprises the following steps:
preferentially selecting a neighboring cell of a source cell which belongs to a same frequency layer with the frequency of providing the MBMS service in the source cell as a target cell: UE sets the frequency of providing MBMS service in the source cell as the highest priority; UE determines the adjacent cell of the source cell belonging to the same frequency layer with the frequency as the same frequency adjacent cell; the UE selects a target cell from the intra-frequency neighboring cells.
The cell selection or reselection criteria further includes: UE determines the cell which can provide MBMS service in the same frequency adjacent cell; UE determines a cell which has the same MBSFN area identification with a source cell in the same-frequency adjacent cells capable of providing the MBMS; and the UE selects the cell with the best radio channel quality as a target cell from the same-frequency adjacent cells with the same MBSFN area identification as the source cell.
The cell selection or reselection criteria further includes: UE determines a cell which can provide MBMS service in the same-frequency adjacent cells; the UE selects the target cell with the best radio channel quality from the adjacent cells with the same frequency which can provide the MBMS service.
The invention is illustrated by the following specific examples.
Example one
As shown in fig. 2, a method for implementing MBMS service continuity for a scenario in which an idle UE moves in an MBSFN area includes:
step 201, the network side sends the cell selection or reselection related configuration information of the MBMS service. The cell selection or reselection related configuration information of the MBMS comprises the following steps: providing at least one of frequency point information (referring to the center frequency and the bandwidth for transmitting the MBMS) of the MBMS, MBSFN area identification indication of an adjacent cell (referring to the adjacent cell of a source cell), a frequency list of an inter-frequency adjacent cell and cell selection or reselection parameters.
The network side provides the frequency point information of the MBMS, the frequency list of the pilot frequency adjacent cells and the cell selection or reselection parameters to the UE through system information and RRC signaling;
the MBSFN area identification indication of the adjacent cell comprises the following steps: MBSFN area identification of adjacent cells and/or indication information bits of the same MBSFN area;
the MBSFN area identity indication of the neighboring cell may be provided to the UE by the source cell via interaction between the source eNB (eNB of the source cell) and the neighboring eNB (eNB of the neighboring cell) (the source eNB acquires the MBSFN area identity of the neighboring cell from the neighboring eNB through an X2 connection, and the source cell provides the acquired MBSFN area identity to the UE); alternatively, the UE is provided by the source cell according to a Multi-cell/Multicast Coordination Entity (MCE) indication (in which the MBSFN area identity of the neighboring cell is carried) to the UE (in this case, there is no X2 connection between the source eNB and the neighboring eNB).
The cell selection or reselection parameters include at least: cell selection or reselection threshold values, frequency priorities, time parameters, and the like.
Step 202, when the UE receives the cell selection or reselection related configuration information of the MBMS service sent by the network side and the measurement results of the UE on the source cell and the neighboring cells meet the specific search or measurement criteria, the UE determines to perform cell selection or reselection.
It is determined that the measurement results of the UE on the source cell and the neighboring cell satisfy the specific search or measurement criteria in the prior art, and details thereof are not repeated here.
And if the UE does not receive the cell selection or reselection related configuration information of the MBMS sent by the network side, or the measurement results of the UE on the source cell and the adjacent cell do not meet the specific search or measurement standard, not performing cell selection or reselection.
Step 203, the UE sets the frequency providing the MBMS service in the source cell to the highest priority, and the UE selects the neighboring cell of the source cell belonging to the same frequency layer as the highest priority frequency, that is, the same frequency neighboring cell.
In the step, the UE sets the frequency for providing the MBMS service in the source cell as the highest priority, and does not consider the frequency priority set by the network side; then, the UE selects a cell belonging to the same frequency layer as the highest priority frequency from neighboring cells of the source cell, which is called a same frequency neighboring cell. Subsequently, the UE selects a target cell from the intra-frequency neighboring cells.
In step 204, the UE determines whether there is at least one co-frequency neighboring cell capable of providing the MBMS service, if so, the process goes to step 205, otherwise, the process goes to step 211.
The UE can acquire which cells in the same-frequency adjacent cells of the source cell can provide the MBMS according to the frequency point information of the MBMS.
The essence of this step is to filter out unicast cells of the same-frequency neighboring cells, i.e. the same-frequency neighboring cells that provide MBMS service all belong to a certain MBSFN area.
Step 205, in the adjacent cells with the same frequency that can provide the MBMS service, the UE judges whether there is at least one adjacent cell with the same MBSFN area identifier as the source cell, if yes, go to step 206, otherwise go to step 211;
the adjacent cells with the same MBSFN area identification as the source cell in the same frequency mean that: although the MBSFN area identifiers of the source cell and the cells adjacent to the same frequency are not completely the same, such as: the MBSFN area identifier of the source cell is: { MBSFN area ID1, MBSFN area ID2, MBSFN area ID3}, the MBSFN area identification of an adjacent cell with same frequency is: { MBSFN area ID1, MBSFN area ID4, MBSFNarea ID5}, but for MBMS traffic received by a certain UE, specifically: when the MBMS service received by the UE in the source cell belongs to the MBSFN area ID1, the source cell and the co-frequency neighboring cell have the same MBSFN area identifier for the UE.
In addition, when the MBMS service received by the UE in the source cell belongs to the MBSFN area ID2, the source cell and the co-frequency neighboring cell do not have the same MBSFN area identity for the UE.
The MBSFN area identification indication of the adjacent cell in the cell selection or reselection related configuration information of the MBMS comprises the following steps: MBSFN area identification of neighboring cells, and/or the same MBSFN area indication information bits.
Wherein, the same MBSFN area indication information bits refer to: the network side configures an indication information bit for a plurality of adjacent same-frequency cells of the source cell, and preferably, when the indication information bit is set to 1, it indicates that the same-frequency adjacent cells and the source cell have the same MBSFN area identifier (of course, the indication information bit indicating that the same-frequency adjacent cells and the source cell have the same MBSFN area identifier may be set in other manners, such as 0, etc.).
For example, the MBSFN area identifier of the source cell a is: { MBSFN area ID 1., MBSFN area ID N } (N is 1 or more); the MBSFN area identification of the same-frequency adjacent cell B is as follows: { MBSFN area ID 1., MBSFN area ID N } (N is 1 or more); the MBSFN area identification of the same-frequency adjacent cell C is as follows: { MBSFN area ID 1., MBSFN area IDM } (M is greater than or equal to N), it can be seen that same-frequency neighboring cells B and C have the same MBSFN area identity as source cell a, and then the same MBSFN area indication information bits corresponding to same-frequency neighboring cells B and C are both set to 1.
That is to say: if the MBSFN area identification of a certain same-frequency adjacent cell is equal to or contains the MBSFN area identification of the source cell, the network side sets the indication information bit of the same MBSFN area of the same-frequency adjacent cell to be 1, otherwise, the indication information bit is set to be 0.
Step 206, sequencing the adjacent cells with the same frequency, which can provide the MBMS service and have the same MBSFN area identification with the source cell.
If there are multiple (more than one) co-frequency adjacent cells which can provide the MBMS service and have the same MBSFN area identity as the source cell, the UE ranks the cells by using R-criterion according to the measured radio channel quality of the cells, so that the co-frequency adjacent cell with the best radio channel quality can be identified.
In step 207, the UE selects a target cell.
If the MBMS service can be provided and only one same-frequency adjacent cell with the same MBSFN area identifier as the source cell exists, the UE takes the same as the target cell;
if there are multiple (more than one) same-frequency adjacent cells which can provide MBMS service and have the same MBSFN area identification with the source cell, the same-frequency adjacent cell with the best radio channel quality is selected as the target cell.
Step 208, the UE moves to the target cell, determines the service state of the UE in the source cell, and if the UE is in the state of receiving the MBMS service in the source cell, goes to step 209; if the UE is in a state of interest to receive the MBMS service in the source cell, the process goes to step 210.
Step 209, if the UE is in a state of receiving the MBMS service in the source cell, and the UE enters the target cell, the UE can continue to receive the MBMS service without reading the MCCH information because the source cell and the target cell belong to the same MBSFN area, so that the MBMS service is not interrupted, thereby achieving service continuity.
Step 210, if the UE is in a state of being interested in receiving the MBMS service in the source cell, after the UE enters the target cell, the UE continues to monitor the MCCH notification information to prepare to receive the MBMS service.
In step 211, the UE selects a target cell.
Carrying step 204, if there is no cell capable of providing MBMS service in the same frequency adjacent cells; or,
in the receiving step 205, if there is no cell with the same MBSFN area identifier as the source cell in the same-frequency adjacent cells that can provide the MBMS service;
then, the UE selects an unrestricted access cell that meets the cell selection or reselection threshold requirement from the neighboring cells of the source cell as a target cell.
Wherein, the threshold requirement is satisfied, that is, the result of the operation of the wireless channel quality of the target cell according to the S standard (S-criterion) satisfies the cell selection or reselection threshold value.
An unrestricted access cell is one that does not belong to a forbidden cell in the blacklist.
In step 212, the UE moves to the target cell, and the UE sends an MBMS service interruption indication to the NAS or the application layer through the AS, and explains the interruption reason (in this embodiment, the MBMS service interruption is caused by the three cases indicated in step 211) to improve the service experience of the user.
Example two
As shown in fig. 3, a method for implementing MBMS service continuity for a scenario in which idle-state UE moves between MBSFN areas includes:
step 301, the network side sends the cell selection or reselection related configuration information of the MBMS service.
This step is the same as step 201 and is not described here again.
Step 302, when the UE receives the cell selection or reselection related configuration information of the MBMS service sent by the network side and the measurement results of the UE on the source cell and the neighboring cells satisfy the specific search or measurement criteria, the UE determines to perform cell selection or reselection.
This step is the same as step 202, and is not described herein again.
Step 303, the UE sets the frequency providing the MBMS service in the source cell to the highest priority, and selects the neighboring cell of the source cell belonging to the same frequency layer as the highest priority frequency, that is, the same frequency neighboring cell.
This step is the same as step 203, and is not described herein again.
Step 304, the UE determines whether there is at least one co-frequency neighboring cell capable of providing the MBMS service, if yes, go to step 305, otherwise go to step 312;
this step is the same as step 204, and is not described herein again.
305, judging whether a same-frequency adjacent cell with the same MBSFN area identifier as a source cell exists in a same-frequency adjacent cell capable of providing the MBMS, if so, turning to 306, otherwise, turning to 312;
UE can determine whether the MBSFN area identification of the same-frequency adjacent cell is the same as the source cell or not according to the MBSFN area identification indication of the adjacent cell, if not, the same-frequency adjacent cell with the same MBSFN area identification as the source cell does not exist (because the UE moves among the MBSFN areas, the same-frequency adjacent cell with the same MBSFN area identification as the source cell possibly does not exist)
Step 306, sequencing the adjacent cells with the same MBSFN area identification with the source cell and capable of providing the MBMS.
When there are cells having the same MBSFN area identifier as the source cell among the same-frequency neighboring cells that can provide the MBMS service, and there are multiple (more than one) cells, then the UE uses R-criterion to rank the cells according to the measured radio channel quality of the cells, thereby determining the best-quality same-frequency neighboring cells.
In step 307, the UE selects a target cell.
If the MBMS service can be provided and only one same-frequency adjacent cell with the same MBSFN area identifier as the source cell exists, the UE takes the same as the target cell;
if there are multiple (more than one) same-frequency adjacent cells which can provide MBMS service and have the same MBSFN area identification with the source cell, the same-frequency adjacent cell with the best radio channel quality is selected as the target cell.
Step 308, the UE moves to the target cell, determines whether there is an MBMS service being received or interested in being received by the UE in the target cell, if yes, executes step 309; otherwise, go to step 313;
step 309, judging the service state of the UE in the source cell; if the UE is in a state of receiving the MBMS service in the source cell, go to step 310; if the UE is in a state of interest to receive the MBMS service in the source cell, the process goes to step 311.
Step 310, if the UE is in the state of receiving the MBMS service in the source cell, the UE receives the system message and the MCCH message in the target cell, monitors the MCCH notification message, continues to receive the MBMS service, ensures the continuity of the MBMS service, and ends the process.
Step 311, if the UE is in the state of being interested in receiving the MBMS service in the source cell, the UE receives the system message and the MCCH message in the target cell, and monitors the MCCH notification message to prepare to receive the MBMS service.
In step 312, the UE selects a target cell.
A carrying step 304, if there is no cell capable of providing MBMS service in the same frequency adjacent cells; or,
carrying step 305, if there is no cell with the same MBSFN area identifier as the source cell in the same frequency adjacent cells which can provide the MBMS service;
then, the UE selects an unrestricted access cell from the neighboring cells that meets the cell selection or reselection threshold requirement as a target cell.
The threshold requirement is met, namely that the result of the operation of the wireless channel quality of the target cell measured by the UE according to the S-criterion (S-criterion) meets the cell selection or reselection threshold value.
An unrestricted access cell is one that does not belong to a forbidden cell in the blacklist.
Step 313, the UE moves to the target cell, and the UE sends an MBMS service interruption indication to the NAS or the application layer through the AS, and explains the interruption reason (in this embodiment, the interruption reason is that the UE moves to another MBSFN area, and there are three cases indicated in step 312 and the target cell indicated in step 308 does not have the MBMS service that the UE is receiving or is interested in receiving), so AS to improve the service experience of the user, and the process is ended.
EXAMPLE III
As shown in fig. 4, a method for implementing MBMS service continuity for a scenario in which an idle UE moves from an MBSFN area to a non-MBSFN area, including a scenario in which the UE moves from an MBSFN area to a reserved cell, includes:
step 401, a network side sends cell selection or reselection related configuration information of an MBMS service.
This step is the same as step 201 and is not described here again.
Step 402, the UE determines to perform cell selection or reselection when the UE receives the cell selection or reselection related configuration information of the MBMS service sent by the network side and the measurement results of the UE on the source cell and the neighboring cells meet a specific search or measurement standard.
This step is the same as step 202 and is not described here.
Step 403, the UE sets the frequency providing the MBMS service in the source cell to the highest priority, and the UE selects the neighboring cell of the source cell belonging to the same frequency layer as the highest priority frequency, that is, the same frequency neighboring cell.
This step is the same as step 203 and will not be described herein.
Step 404, the UE determines whether there is a common-frequency neighboring cell that can provide the MBMS service, if so, the process goes to step 405, otherwise, the process goes to step 411;
the essence of this step is to filter unicast cells in co-frequency neighbor cells.
Step 405, sequencing the same frequency adjacent cells capable of providing MBMS service.
If there are several (more than one) co-frequency neighboring cells that can provide the MBMS service, the UE ranks the cells according to the measured radio channel quality of the cells by using R-criterion, thereby confirming the co-frequency neighboring cell with the best radio channel quality.
In step 406, the UE selects a target cell.
If the same-frequency adjacent cells which can provide the MBMS exist and only one cell exists, the UE takes the same-frequency adjacent cells as a target cell;
if there are several (more than one) same-frequency adjacent cells which can provide the MBMS service, the same-frequency adjacent cell with the best radio channel quality is selected as the target cell.
Step 407, the UE moves to the target cell, and determines whether there is an MBMS service being received or interested in being received by the UE in the target cell, if yes, go to step 408, otherwise go to step 412;
step 408, judging the service state of the UE in the source cell; if the UE is in the state of receiving the MBMS service in the source cell, go to step 409; if the UE is in a state of interest to receive the MBMS service in the source cell, it goes to step 410.
Step 409, if the UE is in the state of receiving the MBMS service in the source cell, the UE receives the system message and the MCCH message in the target cell, monitors the MCCH notification message, continues to receive the MBMS service, ensures the continuity of the MBMS service, and ends the process.
Step 410, if the UE is in the state of being interested in receiving the MBMS service in the source cell, the UE receives the system message and the MCCH message in the target cell, and monitors the MCCH notification message to prepare to receive the MBMS service.
In step 411, the UE selects a target cell.
A carrying step 404, if there is no cell capable of providing the MBMS service in the same-frequency neighboring cells (i.e. all the same-frequency neighboring cells are unicast cells); then, the UE selects an unrestricted access cell that meets the cell selection or reselection threshold requirement from the neighboring cells of the source cell as a target cell.
The threshold requirement is met, namely that the result of the operation of the wireless channel quality of the target cell measured by the UE according to the S-criterion (S-criterion) meets the cell selection or reselection threshold value.
An unrestricted access cell is one that does not belong to a forbidden cell in the blacklist.
Step 412, the UE moves to the target cell, and the UE sends an MBMS service interruption indication to the NAS or the application layer through the AS, and explains the interruption reason (in this embodiment, the interruption reason is that the UE moves to a non-MBSFN area or a reserved area, and the two situations indicated in step 411 and the target cell indicated in step 407 do not have the MBMS service that the UE is receiving or is interested in receiving), so AS to improve the service experience of the user, and the process is ended.
It should be noted that, when the UE changes from the connected state to the idle state, the idle UE needs to perform a cell selection procedure, in this case, the UE usually attempts to select a cell connected in the past, but the connection release message may contain information instructing the UE to search for a cell on a specific frequency. In the present invention, if the connected UE is in a state of receiving the MBMS service in the source cell, the idle UE preferentially selects the last cell where the connected UE resides (the cell selection process is the prior art and is not described here again), or the idle UE preferentially selects the same-frequency neighboring cell that provides the MBMS service by using the target cell selection method described above in the present invention (in this case, the specific implementation of implementing the MBMS service continuity is the same as the processes shown in fig. 2, fig. 3 and fig. 4, and is not described here again).
In order to implement the above method for implementing MBMS service continuity, the present invention further provides a system for implementing MBMS service continuity, as shown in fig. 5, the system includes:
a sending module, configured to send cell selection or reselection related configuration information of an MBMS service;
a receiving module, configured to receive cell selection or reselection related configuration information of an MBMS service;
the selection module is used for selecting a cell adjacent to a source cell of a same frequency layer with the frequency of the MBMS service provided in the source cell as a target cell after the receiving module receives the cell selection or reselection related configuration information of the MBMS service;
the switching module is used for moving the idle-state UE from the source cell to the target cell;
and the service module is used for enabling the idle-state UE to continuously receive the MBMS service or prepare to receive the MBMS service in the target cell.
The selection module is further configured to set a frequency of providing the MBMS service in the source cell to a highest priority when determining to perform cell selection or reselection; determining an adjacent cell of a source cell belonging to a same frequency layer with the frequency as a same frequency adjacent cell; and selecting a target cell from the same-frequency adjacent cells.
The selection module is also used for determining a cell which can provide the MBMS service in the same-frequency adjacent cells; determining a cell which has the same MBSFN area identification with a source cell in the same-frequency adjacent cells capable of providing the MBMS; and selecting the target cell with the best radio channel quality from the same-frequency adjacent cells with the same MBSFN area identification as the source cell.
The selection module is also used for determining a cell which can provide the MBMS service in the same-frequency adjacent cells; and selecting the target cell with the best radio channel quality from the same-frequency adjacent cells capable of providing the MBMS service.
The service module is further used for enabling the UE to continuously receive the MBMS service in the target cell when the idle-state UE is moved from the source cell to the target cell, the UE is determined to be in a state of receiving the MBMS service in the source cell and the target cell contains the MBMS service which the UE is receiving or is interested in receiving;
and the service module is also used for enabling the UE to monitor the MCCH notification information and prepare for receiving the MBMS when the idle-state UE moves from the source cell to the target cell, and the UE is determined to be in the MBMS receiving state interested in the source cell and the target cell contains the MBMS which is being received or is interested in being received by the UE.
In order to implement the above method for implementing MBMS service continuity, the present invention further provides a user equipment for implementing MBMS service continuity, and as shown in fig. 6, the user equipment includes:
a receiving module, configured to receive cell selection or reselection related configuration information of an MBMS service sent by a network side;
the selection module is used for selecting a cell adjacent to a source cell which belongs to a same frequency layer with the frequency of the MBMS service provided in the source cell as a target cell after receiving the cell selection or reselection related configuration information of the MBMS service;
the switching module is used for moving the idle-state UE from the source cell to the target cell;
and the service module is used for enabling the idle-state UE to continuously receive the MBMS service or prepare to receive the MBMS service in the target cell.
The selection module is further configured to set a frequency of providing the MBMS service in the source cell to a highest priority when determining to perform cell selection or reselection; determining an adjacent cell of a source cell belonging to a same frequency layer with the frequency as a same frequency adjacent cell; and selecting a target cell from the same-frequency adjacent cells.
The selection module is also used for determining a cell which can provide the MBMS service in the same-frequency adjacent cells; determining a cell which has the same MBSFN area identification with a source cell in the same-frequency adjacent cells capable of providing the MBMS; and selecting the target cell with the best radio channel quality from the same-frequency adjacent cells with the same MBSFN area identification as the source cell.
The selection module is also used for determining a cell which can provide the MBMS service in the same-frequency adjacent cells; and selecting the target cell with the best radio channel quality from the same-frequency adjacent cells capable of providing the MBMS service.
The service module is further used for enabling the UE to continuously receive the MBMS service in the target cell when the idle-state UE is moved from the source cell to the target cell, the UE is determined to be in a state of receiving the MBMS service in the source cell and the target cell contains the MBMS service which the UE is receiving or is interested in receiving;
and the service module is also used for enabling the UE to monitor the MCCH notification information and prepare for receiving the MBMS when the idle-state UE moves from the source cell to the target cell, and the UE is determined to be in the MBMS receiving state interested in the source cell and the target cell contains the MBMS which is being received or is interested in being received by the UE.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (14)
1. A method for realizing MBMS service continuity is characterized in that the method comprises:
a network side sends cell selection or reselection related configuration information of a Multimedia Broadcast Multicast Service (MBMS) service;
after receiving the cell selection or reselection related configuration information of the MBMS, idle User Equipment (UE) selects a cell adjacent to a source cell which belongs to a same frequency layer with the frequency of providing the MBMS in the source cell as a target cell;
the idle state UE moves from a source cell to a target cell, and continues to receive the MBMS service or prepares to receive the MBMS service in the target cell;
the selecting, as the target cell, a cell adjacent to a source cell having a frequency of providing the MBMS service on a same frequency layer as a source cell includes:
the UE determines a cell which can provide the MBMS service in the same-frequency adjacent cells;
the UE determines a cell which has the same MBSFN area identification with a source cell in the same-frequency adjacent cells capable of providing the MBMS;
the UE selects the cell with the best radio channel quality as a target cell from the same-frequency adjacent cells with the same MBSFN area identification as the source cell; or,
the UE determines a cell which can provide the MBMS service in the same-frequency adjacent cells;
and the UE selects the cell with the best radio channel quality as a target cell from the adjacent cells with the same frequency capable of providing the MBMS.
2. The method for implementing MBMS service continuity according to claim 1,
the cell selection or reselection related configuration information of the MBMS service includes: providing at least one of frequency point information of the MBMS service, MBMS single frequency network (MBSFN) area identification indication of the adjacent cells, a frequency list of the different-frequency adjacent cells and cell selection or reselection parameters.
3. The method for implementing MBMS service continuity according to claim 2,
the frequency point information for providing the MBMS, the frequency list of the pilot frequency adjacent cells and the cell selection or reselection parameters are provided for the UE by a network side through system information and Radio Resource Control (RRC) signaling.
4. The method for implementing MBMS service continuity according to claim 2,
the MBSFN area identifier indication of the neighboring cell includes: MBSFN area identification of adjacent cells and/or indication information bits of the same MBSFN area;
the MBSFN area identity of the neighboring cell indicates interaction between a source cell base station (eNB) and a neighboring cell eNB and is provided to the UE by the source cell; alternatively, the MBSFN area identity indication of the neighboring cell is provided to the UE by a source cell according to a multi-element/Multicast Coordination Entity (MCE) indication.
5. The method for implementing MBMS service continuity according to claim 2,
the cell selection or reselection parameters include at least: a cell selection or reselection threshold value, a frequency priority, and a time parameter.
6. The method according to claim 2, wherein the selecting, as the target cell, a cell adjacent to a source cell in a same frequency layer as a frequency providing the MBMS service in the source cell comprises: the UE sets the frequency of providing the MBMS service in the source cell as the highest priority; the UE determines an adjacent cell of a source cell belonging to a same frequency layer with the frequency as a same frequency adjacent cell; and the UE selects a target cell from the same-frequency adjacent cells.
7. The method of claim 6, wherein after the idle-state UE moves from the source cell to the target cell, the method further comprises:
when the UE is determined to be in a state of receiving the MBMS service in a source cell and the target cell contains the MBMS service which is being received or is interested in being received by the UE, the UE continues to receive the MBMS service in the target cell;
when the UE is determined to be in the state of interested in receiving the MBMS service in a source cell and the target cell contains the MBMS service which is being received or is interested in receiving by the UE, the UE monitors notification information of a Multicast Control Channel (MCCH) to prepare for receiving the MBMS service.
8. The method of claim 6, wherein after receiving the cell selection or reselection related configuration information of the MBMS service, the idle UE further comprises: and the UE receives the cell selection or reselection related configuration information of the MBMS and determines to perform cell selection or reselection when the measurement results of the UE on the source cell and the adjacent cell meet specific search or measurement standards.
9. A system for implementing MBMS service continuity, the system comprising:
a sending module, configured to send cell selection or reselection related configuration information of an MBMS service;
a receiving module, configured to receive cell selection or reselection related configuration information of the MBMS service;
a selection module, configured to select, after the receiving module receives the cell selection or reselection related configuration information of the MBMS service, a cell adjacent to a source cell in which a frequency providing the MBMS service in the source cell belongs to a common frequency layer as a target cell;
the switching module is used for moving the idle-state UE from the source cell to the target cell;
a service module, configured to enable the idle-state UE to continue receiving the MBMS service or prepare to receive the MBMS service in a target cell;
the selection module is further configured to determine a cell that can provide the MBMS service in the same-frequency neighboring cells; determining a cell which has the same MBSFN area identification with a source cell in the same-frequency adjacent cells capable of providing the MBMS; selecting a target cell with the best radio channel quality from the same-frequency adjacent cells with the same MBSFN area identification as the source cell; or,
the selection module is further configured to determine a cell that can provide the MBMS service in the same-frequency neighboring cells; and selecting the target cell with the best radio channel quality from the same-frequency adjacent cells capable of providing the MBMS service.
10. The system for implementing MBMS service continuity according to claim 9,
the selection module is further configured to set a frequency of providing the MBMS service in the source cell to a highest priority when determining to perform cell selection or reselection; and determining an adjacent cell of a source cell belonging to a same frequency layer with the frequency as a same frequency adjacent cell; and selecting a target cell from the same-frequency adjacent cells.
11. The system for implementing MBMS service continuity according to claim 10,
the service module is further configured to, after the idle-state UE moves from a source cell to a target cell, determine that the UE is in a state of receiving an MBMS service in the source cell and determine that the target cell includes the MBMS service that the UE is receiving or is interested in receiving, enable the UE to continue receiving the MBMS service in the target cell;
the service module is further configured to, after the idle-state UE moves from a source cell to a target cell, when it is determined that the UE is in an MBMS service reception state interested in the source cell and when it is determined that the target cell includes an MBMS service which the UE is receiving or is interested in receiving, enable the UE to monitor MCCH notification information to prepare for receiving the MBMS service.
12. A user equipment for implementing MBMS service continuity, the user equipment comprising:
a receiving module, configured to receive cell selection or reselection related configuration information of an MBMS service sent by a network side;
a selection module, configured to select, after receiving cell selection or reselection related configuration information of the MBMS service, a neighboring cell of a source cell that belongs to a same frequency layer as a frequency providing the MBMS service in the source cell as a target cell;
the switching module is used for moving the idle-state UE from the source cell to the target cell;
a service module, configured to enable the idle-state UE to continue receiving the MBMS service or prepare to receive the MBMS service in a target cell;
the selection module is further configured to determine a cell that can provide the MBMS service in the same-frequency neighboring cells; determining a cell which has the same MBSFN area identification with a source cell in the same-frequency adjacent cells capable of providing the MBMS; selecting a target cell with the best radio channel quality from the same-frequency adjacent cells with the same MBSFN area identification as the source cell; or,
the selection module is further configured to determine a cell that can provide the MBMS service in the same-frequency neighboring cells; and selecting the target cell with the best radio channel quality from the same-frequency adjacent cells capable of providing the MBMS service.
13. The UE for MBMS service continuity according to claim 12,
the selection module is further configured to set a frequency of providing the MBMS service in the source cell to a highest priority when determining to perform cell selection or reselection; and determining an adjacent cell of a source cell belonging to a same frequency layer with the frequency as a same frequency adjacent cell; and selecting a target cell from the same-frequency adjacent cells.
14. The UE implementing MBMS service continuity according to claim 13, wherein the service module is further configured to, after the idle-state UE moves from a source cell to a target cell, enable the UE to continue receiving MBMS service in the target cell when it is determined that the UE is in a state of receiving MBMS service in the source cell and it is determined that the target cell includes MBMS service that the UE is receiving or interested in receiving;
the service module is further configured to, after the idle-state UE moves from a source cell to a target cell, when it is determined that the UE is in an MBMS service reception state interested in the source cell and when it is determined that the target cell includes an MBMS service which the UE is receiving or is interested in receiving, enable the UE to monitor MCCH notification information to prepare for receiving the MBMS service.
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