CN108337649B - Receiving method of multimedia broadcast multicast service - Google Patents

Receiving method of multimedia broadcast multicast service Download PDF

Info

Publication number
CN108337649B
CN108337649B CN201710043150.4A CN201710043150A CN108337649B CN 108337649 B CN108337649 B CN 108337649B CN 201710043150 A CN201710043150 A CN 201710043150A CN 108337649 B CN108337649 B CN 108337649B
Authority
CN
China
Prior art keywords
target cell
cell
configuration information
mbsfn area
information
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201710043150.4A
Other languages
Chinese (zh)
Other versions
CN108337649A (en
Inventor
魏立梅
袁乃华
范晨
曾奇志
朱玉梅
周志宏
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chengdu TD Tech Ltd
Original Assignee
Chengdu TD Tech Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Chengdu TD Tech Ltd filed Critical Chengdu TD Tech Ltd
Priority to CN201710043150.4A priority Critical patent/CN108337649B/en
Publication of CN108337649A publication Critical patent/CN108337649A/en
Application granted granted Critical
Publication of CN108337649B publication Critical patent/CN108337649B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • 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
    • H04W36/0061—Transmission or use of information for re-establishing the radio link of neighbour cell information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The application discloses a method for receiving multimedia broadcast multicast service, which comprises the following steps: when User Equipment (UE) needs to perform cell reselection or handover, judging whether a target cell and a current cell belong to the same MBSFN (multicast broadcast single frequency network) area; when the target cell and the current cell belong to the same MBSFN area, the UE stores the related configuration information of the MBSFN area which can be used in the target cell; and executing a corresponding cell reselection process or a corresponding cell switching process, wherein the UE receives a Multicast Control Channel (MCCH) and a Multimedia Broadcast Multicast Service (MBMS) in the target cell according to the MBSFN related area configuration information. The invention can effectively reduce the MBMS service interruption time when the UE performs cell reselection or switching in the MBSFN mode.

Description

Receiving method of multimedia broadcast multicast service
Technical Field
The present invention relates to mobile communication technology, and in particular, to a method for receiving a Multimedia Broadcast Multicast Service (MBMS).
Background
Currently, the MBMS service in the 3GPP protocol carries two types: unicast bearers and multicast bearers. The unicast bearer is a point-to-point (PTP) bearer established between the network and a specific User Equipment (UE), and the MBMS service is transmitted to the specific UE under the unicast bearer. The multicast bearer is a point-to-multipoint (PTM) bearer, and the MBMS service is broadcast in the cell where the multicast bearer is established under the multicast bearer.
There are two transmission modes for MBMS services carried by multicast: a multimedia broadcast multicast single frequency network (MBSFN) mode and a single cell point-to-multipoint (SC-PTM) mode.
In the MBSFN mode, the MCE performs unified scheduling on all cells in one MBSFN area, and the cells transmit the same MBSFN signal in the same MBSFN subframe in the whole data domain. In the MBSFN mode, the UE regards MBSFN signals from different cells as multipath signals, and the UE combines the multipath signals to obtain diversity gain.
Specifically, in the MBSFN mode, the eNodeB adds two new logical channels and two System Information Blocks (SIBs) to transmit the MBSFN signal.
The newly added logical channels include a Multicast Control Channel (MCCH) and a Multicast Traffic Channel (MTCH). The MCCH carries configuration information of one MBSFN area, the configuration information including: configuration information of each MBMS service provided by the MBSFN area. The cell provides one MCCH for each MBSFN area. The data of each MBMS service in the MBSFN area is carried by one MTCH. The MCCH and MTCH are mapped to transport channels in a time division multiplexed manner: on a Multicast Channel (MCH), the MCH sends to the UE through a Physical Multicast Channel (PMCH).
The two newly added SIBs include SIB13 and SIB 15. The SIB13 carries the configuration information of the MCCH for each MBSFN area in the cell. The configuration information of the MCCH includes: MCCH modification period, repetition period, radio frame offset, etc. The SIB15 provides a Service Area Identity (SAI) of a service area supported by a current frequency bin and a Service Area Identity (SAI) of a service area supported by a neighbor cell on an inter-frequency bin.
In general, when receiving an MBMS service, a UE needs to receive SIB13 to obtain configuration information of an MCCH in each MBSFN area, and then receives each MCCH according to the configuration information. And acquiring the configuration information of the MBMS provided by each MBSFN area from each MCCH. Then, the MBMS service to be received is selected from the MBMS service, and the MBMS service is received in the corresponding subframe according to the configuration information of the MBMS service.
Cell reselection may occur when the UE moves from a source cell to a target cell while in an idle state. In general, the UE will stop receiving any information of the source cell during cell reselection, and sequentially receive the PBCH, SIB1, and all other SIBs in the target cell according to the timing of the target cell. After successfully receiving all SIBs, the UE camps on the target cell. For an idle UE receiving an MBMS service, if the UE is after camping in a cell, resuming receiving the MBMS service in a target cell according to the following procedure would result in a long MBMS service interruption time.
(1) And receiving each MCCH according to each MCCH configuration information on the SIB13 in the target cell.
(2) And obtaining the configuration information of the MBMS provided by each MBSFN area from each MCCH.
(3) And if the target cell provides the MBMS service which is received by the UE in the source cell, receiving the service in the target cell according to the configuration information of the service. And if the target cell does not provide the MBMS service which is being received by the UE in the source cell, recovering to receive the service by establishing unicast.
Handover occurs when the UE moves from a source cell to a target cell while in RRC connected state. The UE also stops receiving any information in the source cell during the handover procedure, and starts to resume the service received in the source cell before the target cell is received after the handover to the target cell. The process of UE resuming receiving MBMS service in target cell is the same as the process of resuming receiving MBMS service after cell reselection. Therefore, the problem that the interruption time of the MBMS service is long also exists in resuming the reception of the MBMS service during the handover.
Therefore, in the existing system, in the MBSFN manner, the UE needs to wait for successfully receiving all SIBs during cell reselection or handover and then resume receiving the MBMS service, which may cause a problem of long MBMS service interruption time.
Disclosure of Invention
In view of the above, the present invention is directed to a method for receiving an MBMS service, which can effectively reduce the MBMS service interruption time when a UE performs cell reselection or handover in an MBSFN manner.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
a receiving method of multimedia broadcast multicast service includes:
when User Equipment (UE) needs to perform cell reselection or handover, judging whether a target cell and a current cell belong to the same MBSFN (multicast broadcast single frequency network) area;
when the target cell and the current cell belong to the same MBSFN area, the UE stores the related configuration information of the MBSFN area which can be used in the target cell; and executing a corresponding cell reselection process or a corresponding cell switching process, wherein the UE receives a Multicast Control Channel (MCCH) and a Multimedia Broadcast Multicast Service (MBMS) in the target cell according to the related configuration information of the MBSFN area.
In summary, the method for receiving an MBMS service according to the present invention determines whether a target cell and a current cell belong to the same MBSFN area when a UE needs to perform cell reselection or handover, and when the target cell and the current cell belong to the same MBSFN area, the UE stores MBSFN area related configuration information that can be used in the target cell and is obtained in the current cell; and receiving a multicast control channel MCCH and a multimedia broadcast multicast service MBMS in the target cell according to the stored related configuration information of the MBSFN area in the process of executing the corresponding cell reselection or the process of switching. Therefore, under the condition that the target cell of the UE needing cell reselection or switching and the current cell belong to the same MBSFN area, the continuity of the UE for receiving the MBMS can be ensured, the MBMS can be recovered after the target cell successfully receives all SIBs, and therefore the interruption time of the MBMS when the UE carries out cell reselection or switching can be effectively reduced in an MBSFN mode.
Drawings
FIG. 1 is a schematic flow chart of a method according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The core idea of the invention is as follows: by utilizing the characteristic that each cell in one MBSFN area broadcasts the same MBSFN signal in the same MBSFN subframe, in the process of cell reselection or switching, the MBMS service does not need to be recovered and received according to the MBMS service configuration information obtained from each MCCH after the target cell is resident, and the corresponding MCCH and the corresponding MBMS service are directly received in the target cell according to the MCCH configuration information and the MBMS service configuration information of the source cell, so that the MBMS service interruption time when the UE performs cell reselection or switching can be effectively reduced.
Fig. 1 is a schematic flowchart of a method according to an embodiment of the present invention, and as shown in fig. 1, a method for receiving a multimedia broadcast multicast service implemented by the embodiment mainly includes:
step 101, when user equipment UE needs to perform cell reselection or handover, determining whether a target cell and a current cell belong to the same MBSFN area.
In this step, when the UE needs to perform cell reselection or handover, it needs to determine whether the target cell and the current cell belong to the same MBSFN area, and if so, the continuity of the MBMS service being performed by the UE can be ensured by performing the subsequent steps. The processing when the UE determines that the target cell and the source cell do not belong to the same MBSFN area is not the content of the present invention, and is not described in detail herein.
In practical applications, the UE will perform measurements in the current cell according to the configuration of the network. The measurement includes: the same-frequency measurement may also include different-frequency measurement. How to perform the measurement is the conventional method, and is not described in detail. When the measurement result meets the cell reselection condition or the UE receives a switching command, the UE is triggered to judge: whether the target cell and the current cell belong to the same MBSFN area.
For idle state UE, when the UE finds that the current cell meets the cell reselection condition through measurement, the UE is triggered to judge: whether the target cell and the current cell belong to the same MBSFN area.
For RRC connected state UE, when the UE receives a switching command sent by ENODEB, the UE is triggered to judge: whether the target cell and the current cell belong to the same MBSFN area.
Preferably, the following method may be adopted to determine whether the target cell and the current cell belong to the same MBSFN area:
and step 1011, if the current cell sends the SIB15 information and simultaneously satisfies the condition 1, the condition 2 and the condition 3, determining that the target cell and the current cell belong to the same MBSFN area. Wherein the content of the first and second substances,
the condition 1 is that the target cell and the current cell have the same frequency point.
The condition 2 is that a service area identifier SAI1 is in an SAI list supported by a frequency point where a target cell is located, and the SAI1 is a service area identifier corresponding to an MBSFN area corresponding to an MBMS service being received by the UE.
Here, the UE may obtain the SAI list supported by the frequency point where the target cell is located from the SIB 15.
The condition 3 is that the reception quality of the MBMS service by the UE in the current cell is not significantly decreased compared to that before the determination.
And step 1012, if the current cell does not send the SIB15 information and simultaneously satisfies the condition 1, the condition 2a and the condition 3, determining that the target cell and the current cell belong to the same MBSFN area. The condition 2a is a frequency point list of the MBMS service being received by the UE at the frequency point where the target cell is located, where the frequency point list is included in a User Service Description (USD) received by the UE at the current cell. The conditions indicated that: the target cell supports the MBMS service.
It should be noted that, in the existing system, the User Service Description (USD) is MCPTT SERVER of information sent to the UE. For each MBMS service, the USD provides the service identification TMGI, the session start and end time corresponding to the service, the frequency point list for providing the service and the service area identification SAI list for providing the service.
For the MBMS service being received by the UE in the current cell, the UE may obtain from the received USD: a list of SAIs providing the service and a list of frequency points providing the service.
Step 1013, if the current cell sends SIB15 information and meets both the condition 1 and the condition 2b, determining that the target cell and the current cell belong to the same MBSFN area; the condition 2b provides that an MBSFN area MBSFN2 exists in the current cell for the MBMS service being received by the UE, the MBSFN area MBSFN2 is not an MBSFN area corresponding to the MBMS service being received by the UE, and a service area identifier SAI2 corresponding to the MBSFN area MBSFN2 is in an SAI list supported by a frequency point where a target cell is located.
It should be noted that, in the current cell, there may be more than one MBSFN area providing the MBMS service being received by the UE. Such as: both MBSFN1 and MBSFN2 provide MBMS services that the UE is receiving, and the two MBSFN areas belong to SA11 and SAI2, respectively. The UE receives the service in the current cell through MBSFN 1.
When the frequency point where the target cell is located supports SAI1, which corresponds to the above condition 2, the UE may receive the MBMS service through MBSFN1 in SAI1 in the target cell.
When the frequency point where the target cell is located does not support SAI1 but supports SAI2, which corresponds to the above condition 2a, the UE may receive the MBMS service through MBSFN2 in SAI2 in the target cell.
In practical applications, when the UE moves to the cell edge, the UE may measure: the RSRP of the cell reference signal of the cell is decreased, and the RSRP of the cell reference signal of the adjacent cell is increased.
When the UE in idle state moves to the edge of a cell, it may be measured that RSRP or RSRQ of cell reference signals of the cell and a certain neighboring cell satisfy a cell reselection condition, and the UE may select the neighboring cell and reselect the target cell.
When the UE in RRC connected state moves to the cell edge, it measures: the RSRP or RSRQ of the cell reference signals of the cell and the adjacent cell meet the measurement reporting condition, and the UE triggers the measurement reporting. The eNodeB selects a cell from a target cell list reported by the UE according to the measurement report of the UE, and sends a switching command to instruct the UE to switch to the target cell.
However, when the target cell and the current cell belong to the same MBSFN area and the UE moves to the cell edge, the reception quality of the MBMS service being received by the UE does not decrease as much as the cell reference signal of the current cell. The receiving quality of the MBMS service can be measured by the receiving power of the PMCH or the BLER of the PMCH corresponding to the MBMS service.
For the idle UE, the PMCH receiving power does not decrease as much as the current cell reference signal RSRP, and the PMCH BLER does not change significantly.
For the UE in the connected state, the receiving power of the PMCH also does not decrease as much as the RSRP of the current cell signal, and the BLER of the PMCH does not change significantly.
Specifically, there are many methods for measuring whether the PMCH reception quality is degraded. Preferably, the following method may be adopted to judge that the reception quality of the MBMS service in the current cell is not significantly degraded compared to before the judgment:
step x1, the UE calculates the number count (PMCH) of PMCH receiving quality reduction in the latest N measurement periods according to the receiving quality measurement result of the PMCH in the latest N measurement periods and a preset statistical rule; the statistical rule is as follows: for the reception quality of a signal, if the measurement result of one measurement period is degraded with respect to the reception quality measurement result of the previous measurement period, adding one to the corresponding reception quality degradation number; and N is the preset number of statistical cycles.
Step x2, the UE counts the number count (rs) of times of the cell reference signal reception quality degradation in the latest N measurement periods according to the statistical rule based on the reception quality measurement results of the cell reference signals in the latest N measurement periods.
Step x3, if count (pmch) < count (ps) -Th, determining that the reception quality of the MBMS service by the UE in the current cell has not significantly decreased compared to that before the determination, where Th is a preset difference threshold and 0< Th < ═ N.
When count (PMCH) < count (ps) -Th, it indicates that PMCH does not drop as significantly as the cell reference signal.
The Th may be set by a person skilled in the art according to actual needs, and only 0< Th < ═ N needs to be satisfied, for example, Th may be set to N/2.
102, when a target cell and a current cell belong to the same MBSFN area, the UE stores MBSFN area related configuration information which can be used in the target cell; and executing a corresponding cell reselection process or a corresponding cell switching process, wherein the UE receives a Multicast Control Channel (MCCH) and a Multimedia Broadcast Multicast Service (MBMS) in the target cell according to the related configuration information of the MBSFN area.
In this step, when it is determined that the target cell and the current cell belong to the same MBSFN area, the UE needs to store MBSFN area-related configuration information that can be used in the target cell and is obtained by the current cell, so that, in the corresponding cell reselection process or handover process, the MCCH and MBMS services are received in the target cell according to the stored MBSFN area-related configuration information, so as to ensure the continuity of the MBMS service being performed by the UE.
Specifically, the MBSFN area related configuration information may include: MBSFN area identification, MCCH configuration information and configuration information of MBMS service being received by the UE.
The MCCH configuration information is: and obtaining the configuration information of the MCCH corresponding to the corresponding MBSFN area through the SIB 13. The configuration information includes: subframe position information of PMCH corresponding to MCCH, adopted coding modulation mode and the like. Thus, the UE can directly receive the MCCH in the corresponding subframe in the target cell.
The MBMS service being received by the UE is identified with the TMGI. The MBMS service configuration information is configuration information of a PMCH of the MBMS service carrying the TMGI identifier in the MBSFN area. In this way, the UE can directly receive the MBMS service at the time domain location of the corresponding PMCH in the target cell.
Configuration information for a PMCH includes: MBSFN subframe position information occupied by the PMCH, coding and modulation parameters of the PMCH, a logic channel ID of the MTCH corresponding to each MBMS service on the PMCH, a scheduling period of the PMCH and the like.
In practical applications, corresponding to various scenarios distinguished when determining in the above step 101 whether the target cell and the current cell belong to the same MBSFN area, the MBSFN area related configuration information that can be used in the target cell and is stored by the UE in this step 102 is specifically as follows:
when the current cell sends SIB15 information and satisfies the above condition 1, condition 2, and condition 3, the MBSFN area related configuration information that can be used in the target cell is related configuration information of an MBSFN area corresponding to the MBMS service currently being received by the UE.
When the current cell does not send SIB15 information and satisfies the condition 1, the condition 2a, and the condition 3 at the same time, the MBSFN area related configuration information that can be used in the target cell is related configuration information of an MBSFN area corresponding to the MBMS service currently being received by the UE.
When the current cell transmits SIB15 information and the condition 1 and the condition 2b are satisfied at the same time, the MBSFN area-related configuration information that can be used in the target cell is the MBSFN area MBSFN 2-related configuration information.
Preferably, the specific process of the UE receiving the multicast control channel MCCH and the MBMS in the target cell according to the MBSFN area-related configuration information may be:
for the MCCH, the UE determines each subframe sent by the PMCH for bearing the MCCH according to the subframe position information of the PMCH corresponding to the MCCH and receives the PMCH in the subframes.
For the MBMS service being received by the UE, the UE determines each subframe sent by the corresponding PMCH according to the MBSFN subframe position information occupied by the PMCH corresponding to the MBMS service indicated by the MBSFN area related configuration information and receives the PMCH in the subframes.
The UE demodulates and decodes the received PMCH, and discards a Transport Block (TB) when the UE decodes the TB in error; and when the UE correctly decodes the TB on the PMCH, performing high-level processing on the TB obtained by decoding.
Wherein, the specific processes of demodulation and decoding comprise:
the UE determines the length and the modulation mode of a TB on the PMCH according to the encoding and modulation parameters of the PMCH, and demodulates, descrambles and decodes the PMCH received in an MBSFN subframe according to the length, the debugging mode and the MBSFN area ID of the TB on the PMCH;
the high layer processing includes MAC layer processing, RLC layer processing, and RRC layer processing. The specific process can be as follows:
firstly, the UE performs MAC layer processing on the TB, where the MAC layer processing includes demultiplexing the TB.
When the UE acquires that the TB includes MCH scheduling information MAC CE according to the demultiplexing result, the MAC CE is stored, time domain position information of the MBMS being received is extracted from the MAC CE, and the UE receives the MBMS in a corresponding subframe according to the time domain position information;
when the UE obtains an MAC SDU according to the demultiplexing, and the logical channel ID corresponding to the MAC SDU is the same as the logical channel ID of the MBMS being received by the UE, the UE judges that the MAC SDU belongs to the MBMS being received, triggers the RLC layer processing of the MAC SDU, and obtains the RLC SDU corresponding to the MBMS service data according to the RLC layer processing;
when the UE obtains an MAC SDU according to demultiplexing, and the logical channel ID corresponding to the MAC SDU is the same as the logical channel ID of the MCCH, the UE judges that the MAC SDU belongs to the MCCH, triggers the MAC SDU to be processed by an RLC layer to obtain corresponding RLC SDU, triggers the RRC layer to be processed by the RLC SDU to obtain the configuration information of an MBSFN area borne on the MCCH, analyzes the configuration information of the MBSFN area, extracts the configuration information of MTCH corresponding to the MBMS being received by the UE, and receives the MBMS according to the extracted configuration information of the MTCH;
and when the UE obtains an MAC SDU according to the demultiplexing, and the logical channel ID corresponding to the MAC SDU is different from the specified logical channel ID, the UE discards the MAC SDU, wherein the specified logical channel ID comprises the logical channel ID of the MBMS being received by the UE and the logical channel ID of the MCCH of the target cell.
Theoretically, by adopting the determination method in the step 101, it can be accurately determined whether the target cell and the current cell belong to the same MBSFN area, but in practical application, due to the existence of unreliable factors of actual channel transmission, the accuracy of information received by the UE cannot be ensured, so that there is a problem of erroneous determination in the step 101, based on this, in order to further ensure the accuracy of the present invention, in the cell reselection and handover process, the UE can further check whether the target cell and the source cell belong to the same MBSFN area, and once the problem of erroneous determination is found, the reception of the multicast control channel MCCH and the multimedia broadcast multicast service MBMS in the target cell is stopped. Specifically, the following method can be adopted for this purpose:
further, when a preset termination condition is met, the UE stops receiving the multicast control channel MCCH and the multimedia broadcast multicast service MBMS in the target cell.
Specifically, the termination condition is any one of a first termination condition, a second termination condition, a third termination condition, a fourth termination condition, a fifth termination condition, and a sixth termination condition.
Wherein the first termination condition is that the UE receives PBCH in a target cell, and the bandwidth of the target cell obtained from the PBCH is different from that of a source cell.
The second termination condition is that the UE receives SIB1 information in a target cell, and learns from the uplink and downlink ratio of the TD in the SIB1 information: and some subframes in the subframes occupied by the PMCH in the saved MBSFN area related configuration information belong to uplink subframes in a target cell.
The third termination condition is that the UE receives SIB2 information in the target cell, and learns from MBSFN subframe configuration information in the SIB2 information: and part of subframes occupied by PMCH in the saved MBSFN area related configuration information are not included in MBSFN subframe configuration information of a target cell.
The fourth termination condition is that the UE receives SIB13 information in a target cell, and learns from each MBSFN area ID information in the SIB13 information: the target cell and the source cell do not belong to the same MBSFN area.
The fifth termination condition is that the UE receives a multicast control channel MCCH in a target cell, configuration information of a PMCH of an MBMS service being received by the UE is obtained from the MCCH, and the MBMS service is received according to the configuration information of the PMCH;
the sixth termination condition is that the UE knows in the target cell according to the received MCCHs: the target cell does not provide the MBMS service currently being received.
In the method, when one of the first termination condition, the second termination condition, the third termination condition, the fourth termination condition, the fifth termination condition and the sixth termination condition is satisfied, it is indicated that there is a false break before the first termination condition, so that the MCCH and the MBMS are received in the target cell by using the MBSFN area-related configuration information that is obtained and stored in the source cell before.
The above method is applicable to both FDD and TDD.
Further, for FDD and TDD, if the target cell cannot receive the PMCH before acquiring the PBCH, the following method may be used to check the determination result of whether the target cell and the current cell belong to the same MBSFN area, and receive MCCH and MBMS services in the target cell:
when the UE judges that a target cell and a current cell belong to the same MBSFN area and cannot receive the PMCH before the target cell obtains the PBCH, the UE triggers the PBCH to be received in the target cell, if the bandwidth of the target cell is different from that of a source cell according to the received PBCH, the method is ended, otherwise, the UE receives a Multicast Control Channel (MCCH) and a Multimedia Broadcast Multicast Service (MBMS) in the target cell, and the termination condition is any one of a second termination condition, a third termination condition, a fourth termination condition, a fifth termination condition and a sixth termination condition;
the second termination condition is that the UE receives SIB1 information in a target cell, and learns from the uplink and downlink ratio of the TD in the SIB1 information: some subframes in the subframes occupied by the PMCH in the saved MBSFN area related configuration information belong to uplink subframes in a target cell;
the third termination condition is that the UE receives SIB2 information in the target cell, and learns from MBSFN subframe configuration information in the SIB2 information: part of subframes occupied by PMCH in the saved MBSFN area related configuration information are not included in MBSFN subframe configuration information of a target cell;
the fourth termination condition is that the UE receives SIB13 information in the target cell, and learns from the MBSFN area ID information in the SIB13 information: the target cell and the source cell do not belong to the same MBSFN area;
the fifth termination condition is that the UE receives a multicast control channel MCCH in a target cell, configuration information of a PMCH of an MBMS service being received by the UE is obtained from the MCCH, and the MBMS service is received according to the configuration information of the PMCH;
the sixth termination condition is that the UE knows in the target cell according to the received MCCHs: the target cell does not provide the MBMS service currently being received.
Further, for the TDD system, when the target cell and the source cell do not belong to the same MBSFN area, if the ratio of the uplink and downlink timeslots of the target cell is different from that of the source cell, the following may be caused: the UE receives the MBMS service in the uplink subframe of the target cell, which may affect the radio frequency of the UE. For this purpose, the following modifications may be made:
the method further comprises:
for a time division duplex TDD system, after the UE judges that a target cell and a current cell belong to the same MBSFN area, the UE triggers to receive PBCH in the target cell, if the bandwidth of the target cell is different from that of a source cell according to the received PBCH, the method is ended, otherwise, the SIB1 information is triggered and received;
if the UE receives SIB1 information in the target cell, and knows according to the TDD uplink and downlink ratio in the SIB1 information: if the MBSFN subframe indicated in the stored related configuration information of the MBSFN area belongs to an uplink subframe in a target cell, ending the method, otherwise, receiving a Multicast Control Channel (MCCH) and a Multimedia Broadcast Multicast Service (MBMS) by the UE in the target cell, wherein the termination condition is any one of a third termination condition, a fourth termination condition, a fifth termination condition and a sixth termination condition;
the third termination condition is that the UE receives SIB2 information in the target cell, and learns from MBSFN subframe configuration information in the SIB2 information: part of subframes occupied by PMCH in the saved MBSFN area related configuration information are not included in MBSFN subframe configuration information of a target cell;
the fourth termination condition is that the UE receives SIB13 information in the target cell, and learns from the MBSFN area ID information in the SIB13 information: the target cell and the source cell do not belong to the same MBSFN area;
the fifth termination condition is that the UE receives a multicast control channel MCCH in a target cell, configuration information of a PMCH of an MBMS service being received by the UE is obtained from the MCCH, and the MBMS service is received according to the configuration information of the PMCH;
the sixth termination condition is that the UE knows in the target cell according to the received MCCHs: the target cell does not provide the MBMS service currently being received.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. A method for receiving a multimedia broadcast multicast service, comprising:
when User Equipment (UE) needs to perform cell reselection or handover, judging whether a target cell and a current cell belong to the same MBSFN (multicast broadcast single frequency network) area;
when the target cell and the current cell belong to the same MBSFN area, the UE stores the related configuration information of the MBSFN area which can be used in the target cell; executing a corresponding cell reselection process or a corresponding cell switching process, wherein the UE receives a Multicast Control Channel (MCCH) and a Multimedia Broadcast Multicast Service (MBMS) in the target cell according to the related configuration information of the MBSFN area;
the judging whether the target cell and the current cell belong to the same MBSFN area comprises the following steps:
if the current cell sends SIB15 information and simultaneously meets condition 1, condition 2 and condition 3, judging that the target cell and the current cell belong to the same MBSFN area; the condition 1 is that the target cell and the current cell have the same frequency point; the condition 2 is that a service area identifier SAI1 is in an SAI list supported by a frequency point where a target cell is located, and the SAI1 is a service area identifier corresponding to an MBSFN area corresponding to an MBMS service being received by the UE; the condition 3 is that the receiving quality of the MBMS service in the current cell by the UE is not significantly reduced compared with the receiving quality before the judgment;
if the current cell does not send SIB15 information and simultaneously meets the condition 1, the condition 2a and the condition 3, determining that the target cell and the current cell belong to the same MBSFN area; the condition 2a is a frequency point list of the MBMS service being received by the UE at the frequency point where the target cell is located, wherein the frequency point list is contained in the USD received by the UE at the current cell;
if the current cell sends SIB15 information and simultaneously meets the condition 1 and the condition 2b, determining that the target cell and the current cell belong to the same MBSFN area; the condition 2b provides that an MBSFN area MBSFN2 exists in the current cell for the MBMS service being received by the UE, the MBSFN area MBSFN2 is not an MBSFN area corresponding to the MBMS service being received by the UE, and a service area identifier SAI2 corresponding to the MBSFN area MBSFN2 is in an SAI list supported by a frequency point where a target cell is located.
2. The method of claim 1, wherein when the current cell sends SIB15 information and conditions 1, 2, and 3 are simultaneously satisfied, the MBSFN area-related configuration information that can be used in the target cell is MBSFN area-related configuration information corresponding to the MBMS currently being received by the UE;
when the current cell does not send SIB15 information and satisfies the condition 1, the condition 2a, and the condition 3 at the same time, the MBSFN area related configuration information that can be used in the target cell is related configuration information of an MBSFN area corresponding to the MBMS service currently being received by the UE;
when the current cell transmits SIB15 information and the condition 1 and the condition 2b are satisfied at the same time, the MBSFN area-related configuration information that can be used in the target cell is the MBSFN area MBSFN 2-related configuration information.
3. The method of claim 1, wherein the determining that the UE has not significantly degraded the reception quality of the MBMS service in the current cell compared to the reception quality of the MBMS service in the current cell before the determining comprises:
the UE counts the number count (PMCH) of PMCH receiving quality reduction times in the latest N measurement periods according to the PMCH receiving quality measurement results in the latest N measurement periods and a preset statistical rule; the statistical rule is as follows: for the reception quality of a signal, if the measurement result of one measurement period is degraded with respect to the reception quality measurement result of the previous measurement period, adding one to the corresponding reception quality degradation number; n is a preset statistical cycle number;
the UE counts the times count (RS) of the reduction of the receiving quality of the cell reference signals in the latest N measuring periods according to the receiving quality measuring results of the cell reference signals in the latest N measuring periods and the statistical rule;
and if count (PMCH) < count (RS) -Th, judging that the receiving quality of the MBMS service of the UE in the current cell is not significantly reduced compared with that before the judgment, wherein Th is a preset difference threshold value, and 0< Th < ═ N.
4. The method of claim 1, wherein the MBSFN area-related configuration information comprises:
MBSFN area identification, MCCH configuration information and configuration information of MBMS service being received by the UE.
5. The method of claim 1, further comprising: and when the preset termination condition is met, the UE stops receiving the multicast control channel MCCH and the multimedia broadcast multicast service MBMS in the target cell.
6. The method according to claim 5, wherein the termination condition is any one of a first termination condition, a second termination condition, a third termination condition, a fourth termination condition, a fifth termination condition and a sixth termination condition;
the first termination condition is that the UE receives PBCH in a target cell, and the bandwidth of the target cell obtained from the PBCH is different from that of a source cell;
the second termination condition is that the UE receives SIB1 information in a target cell, and learns from the uplink and downlink ratio of the TD in the SIB1 information: some subframes in the subframes occupied by the PMCH in the saved MBSFN area related configuration information belong to uplink subframes in a target cell;
the third termination condition is that the UE receives SIB2 information in the target cell, and learns from MBSFN subframe configuration information in the SIB2 information: part of subframes occupied by PMCH in the saved MBSFN area related configuration information are not included in MBSFN subframe configuration information of a target cell;
the fourth termination condition is that the UE receives SIB13 information in a target cell, and learns from each MBSFN area ID information in the SIB13 information: the target cell and the source cell do not belong to the same MBSFN area;
the fifth termination condition is that the UE receives a multicast control channel MCCH in a target cell, configuration information of a PMCH of an MBMS service being received by the UE is obtained from the MCCH, and the MBMS service is received according to the configuration information of the PMCH;
the sixth termination condition is that the UE knows in the target cell according to the received MCCHs: the target cell does not provide the MBMS service currently being received.
7. The method of claim 5, further comprising:
when the UE judges that a target cell and a current cell belong to the same MBSFN area and cannot receive the PMCH before the target cell obtains the PBCH, the UE triggers the PBCH to be received in the target cell, if the bandwidth of the target cell is different from that of a source cell according to the received PBCH, the method is ended, otherwise, the UE receives a Multicast Control Channel (MCCH) and a Multimedia Broadcast Multicast Service (MBMS) in the target cell, and the termination condition is any one of a second termination condition, a third termination condition, a fourth termination condition, a fifth termination condition and a sixth termination condition;
the second termination condition is that the UE receives SIB1 information in a target cell, and learns from the uplink and downlink ratio of the TD in the SIB1 information: some subframes in the subframes occupied by the PMCH in the saved MBSFN area related configuration information belong to uplink subframes in a target cell;
the third termination condition is that the UE receives SIB2 information in the target cell, and learns from MBSFN subframe configuration information in the SIB2 information: part of subframes occupied by PMCH in the saved MBSFN area related configuration information are not included in MBSFN subframe configuration information of a target cell;
the fourth termination condition is that the UE receives SIB13 information in the target cell, and learns from the MBSFN area ID information in the SIB13 information: the target cell and the source cell do not belong to the same MBSFN area;
the fifth termination condition is that the UE receives a multicast control channel MCCH in a target cell, configuration information of a PMCH of an MBMS service being received by the UE is obtained from the MCCH, and the MBMS service is received according to the configuration information of the PMCH;
the sixth termination condition is that the UE knows in the target cell according to the received MCCHs: the target cell does not provide the MBMS service currently being received.
8. The method of claim 5, further comprising:
for a time division duplex TDD system, after the UE judges that a target cell and a current cell belong to the same MBSFN area, the UE triggers to receive PBCH in the target cell, if the bandwidth of the target cell is different from that of a source cell according to the received PBCH, the method is ended, otherwise, the SIB1 information is triggered and received;
if the UE receives SIB1 information in the target cell, and knows according to the TDD uplink and downlink ratio in the SIB1 information: if the MBSFN subframe indicated in the stored related configuration information of the MBSFN area belongs to an uplink subframe in a target cell, ending the method, otherwise, receiving a Multicast Control Channel (MCCH) and a Multimedia Broadcast Multicast Service (MBMS) by the UE in the target cell, wherein the termination condition is any one of a third termination condition, a fourth termination condition, a fifth termination condition and a sixth termination condition;
the third termination condition is that the UE receives SIB2 information in the target cell, and learns from MBSFN subframe configuration information in the SIB2 information: part of subframes occupied by PMCH in the saved MBSFN area related configuration information are not included in MBSFN subframe configuration information of a target cell;
the fourth termination condition is that the UE receives SIB13 information in the target cell, and learns from the MBSFN area ID information in the SIB13 information: the target cell and the source cell do not belong to the same MBSFN area;
the fifth termination condition is that the UE receives a multicast control channel MCCH in a target cell, configuration information of a PMCH of an MBMS service being received by the UE is obtained from the MCCH, and the MBMS service is received according to the configuration information of the PMCH;
the sixth termination condition is that the UE knows in the target cell according to the received MCCHs: the target cell does not provide the MBMS service currently being received.
9. The method of claim 5, wherein the receiving, by the UE, the Multicast Control Channel (MCCH) and the Multimedia Broadcast Multicast Service (MBMS) in the target cell according to the MBSFN area-related configuration information comprises:
for MCCH, the UE determines each subframe sent by PMCH for bearing MCCH according to subframe position information of PMCH corresponding to the MCCH and receives PMCH in the subframes;
for the MBMS service being received by the UE, the UE determines each subframe sent by the corresponding PMCH according to the MBSFN subframe position information occupied by the PMCH corresponding to the MBMS service indicated by the MBSFN area related configuration information and receives the PMCH in the subframes;
the UE demodulates and decodes the received PMCH, and discards a Transport Block (TB) when the UE decodes the TB in error; when the UE correctly decodes the TB on the PMCH, carrying out high-level processing on the TB obtained by decoding;
wherein the demodulating and decoding comprises:
the UE determines the length and the modulation mode of a TB on the PMCH according to the encoding and modulation parameters of the PMCH, and demodulates, descrambles and decodes the PMCH received in an MBSFN subframe according to the length, the debugging mode and the MBSFN area ID of the TB on the PMCH;
the high-level processing comprises the following steps:
the UE performs MAC layer processing on the TB, wherein the MAC layer processing comprises demultiplexing the TB;
when the UE acquires that the TB includes MCH scheduling information MAC CE according to the demultiplexing result, the MAC CE is stored, time domain position information of the MBMS being received is extracted from the MAC CE, and the UE receives the MBMS in a corresponding subframe according to the time domain position information;
when the UE obtains an MAC SDU according to the demultiplexing, and the logical channel ID corresponding to the MAC SDU is the same as the logical channel ID of the MBMS being received by the UE, the UE judges that the MAC SDU belongs to the MBMS being received, triggers the RLC layer processing of the MAC SDU, and obtains the RLC SDU corresponding to the MBMS service data according to the RLC layer processing;
when the UE obtains an MAC SDU according to demultiplexing, and the logical channel ID corresponding to the MAC SDU is the same as the logical channel ID of the MCCH, the UE judges that the MAC SDU belongs to the MCCH, triggers the MAC SDU to be processed by an RLC layer to obtain corresponding RLC SDU, triggers the RRC layer to be processed by the RLC SDU to obtain the configuration information of an MBSFN area borne on the MCCH, analyzes the configuration information of the MBSFN area to extract the configuration information of the MTCH corresponding to the MBMS being received by the UE, and receives the MBMS according to the extracted configuration information of the MTCH;
and when the UE obtains an MAC SDU according to the demultiplexing, and the logical channel ID corresponding to the MAC SDU is different from the appointed logical channel ID, the UE discards the MAC SDU, wherein the appointed logical channel ID comprises the logical channel ID of the MBMS being received by the UE and the logical channel ID of the MCCH of the target cell.
CN201710043150.4A 2017-01-19 2017-01-19 Receiving method of multimedia broadcast multicast service Active CN108337649B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201710043150.4A CN108337649B (en) 2017-01-19 2017-01-19 Receiving method of multimedia broadcast multicast service

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710043150.4A CN108337649B (en) 2017-01-19 2017-01-19 Receiving method of multimedia broadcast multicast service

Publications (2)

Publication Number Publication Date
CN108337649A CN108337649A (en) 2018-07-27
CN108337649B true CN108337649B (en) 2021-05-28

Family

ID=62922993

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201710043150.4A Active CN108337649B (en) 2017-01-19 2017-01-19 Receiving method of multimedia broadcast multicast service

Country Status (1)

Country Link
CN (1) CN108337649B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108990123B (en) * 2018-09-10 2021-05-28 北京中兴高达通信技术有限公司 Target control channel locking method and device, terminal and storage medium

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102511174A (en) * 2010-06-15 2012-06-20 联发科技股份有限公司 Methods to support continuous mbms reception without network assistance
CN102740233A (en) * 2011-04-08 2012-10-17 中兴通讯股份有限公司 Method, user equipment, and system for realizing continuity of multimedia broadcast and multicast service
CN103458371A (en) * 2012-06-05 2013-12-18 中兴通讯股份有限公司 Method and device for receiving multimedia broadcast multicast service
CN104602344A (en) * 2013-10-30 2015-05-06 电信科学技术研究院 Method and equipment for informing group communication information
WO2015061983A1 (en) * 2013-10-30 2015-05-07 Qualcomm Incorporated Service continuity for group communications over evolved multimedia broadcast multicast service

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102511174A (en) * 2010-06-15 2012-06-20 联发科技股份有限公司 Methods to support continuous mbms reception without network assistance
CN102740233A (en) * 2011-04-08 2012-10-17 中兴通讯股份有限公司 Method, user equipment, and system for realizing continuity of multimedia broadcast and multicast service
CN103458371A (en) * 2012-06-05 2013-12-18 中兴通讯股份有限公司 Method and device for receiving multimedia broadcast multicast service
CN104602344A (en) * 2013-10-30 2015-05-06 电信科学技术研究院 Method and equipment for informing group communication information
WO2015061983A1 (en) * 2013-10-30 2015-05-07 Qualcomm Incorporated Service continuity for group communications over evolved multimedia broadcast multicast service

Also Published As

Publication number Publication date
CN108337649A (en) 2018-07-27

Similar Documents

Publication Publication Date Title
CN105684473B (en) Service continuity for group communication over evolved multimedia broadcast multicast service
US10638454B2 (en) Wireless communication system, communication control method, radio base station, radio terminal, and storage medium
US9591542B2 (en) Method, base station and system for reselection or handover to broadcast multicast cell
CN102158808B (en) The method of reseptance of MCCH information and device, subscriber equipment
US11510120B2 (en) System, terminal, base station, and methods for scheduling multimedia broadcast and multicast service reception
CN102158807B (en) Method and device for monitoring MCCH (Multicast Control Channel) notification information and user equipment
KR101917793B1 (en) Method and apparatus for providing service continuity in MBSFN service boundary area
US20120182921A1 (en) Wireless communication system, base station apparatus, mobile station apparatus, and communication method
US10798531B2 (en) Radio terminal and base station
US20140241180A1 (en) EVOLVED MULTIMEDIA BROADCAST MULTICAST SERVICE (eMBMS) INTER-FREQUENCY CELL RESELECTION
CN107241702B (en) MBMS service transmission method and device
WO2008135933A2 (en) Improved multimedia broadcast multicast service mobility and measurement capabilities
CN108353344B (en) Method and apparatus for enhancing services in a communication system supporting public safety network services
CN108337649B (en) Receiving method of multimedia broadcast multicast service
CN108322892B (en) MBSFN (multicast broadcast single frequency network) area configuration information transmission method, device and system
US11026126B2 (en) Method and apparatus for facilitating MBMS reception
US20210385839A1 (en) Group communication method and apparatus
US20200092757A1 (en) Method and Apparatus for Reducing a Service Interruption Time Within a Single-Cell Point-to-Multipoint System

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant