CN102413431B - Method for ensuring MBMS (Multimedia Broadcast Multicast Service) continuity of RRC (Radio Resource Control) connected UE (User Equipment) - Google Patents
Method for ensuring MBMS (Multimedia Broadcast Multicast Service) continuity of RRC (Radio Resource Control) connected UE (User Equipment) Download PDFInfo
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- CN102413431B CN102413431B CN201110435850.0A CN201110435850A CN102413431B CN 102413431 B CN102413431 B CN 102413431B CN 201110435850 A CN201110435850 A CN 201110435850A CN 102413431 B CN102413431 B CN 102413431B
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Abstract
The invention provides a method for ensuring the MBMS (Multimedia Broadcast Multicast Service) continuity of RRC (Radio Resource Control) connected UE (User Equipment). The method comprises the following steps that: step 1, a source eNB (Evolved Node B) obtains MBMS configuration information of neighbored cells; step 2, the source eNB sends the MBMS configuration information of the neighbored cells to the UE; step 3, the UE marks the neighbored cells which can provide the expected MBMS and reports a measurement report with indication information to the source eNB; step 4, the source eNB determines a target cell according to the indication information in the measurement report and signal strength; and step 5, the UE is switched to the target cell. The method provided by the invention not only can ensure the MBMS continuity of the RRC Connected UE but also can realize the MBMS receiving when the UE is located at a slowly-moved scene and the MBMS interests are changed.
Description
Technical field
The present invention relates to wireless communication technology field, relate in particular to the method for the MBMS service continuity of a kind of RRC ConnectedUE of guarantee (in the user terminal of RRC connection status, RRC: Radio Resource control).
Background technology
MBMS (Multimedia Broadcast Multicast Service, multimedia broadcast multi-broadcasting business) be the cellphone multimedia technical scheme based on UMTS (universal mobile telecommunications system) that 3GPP (3G (Third Generation) Moblie partner program) tissue proposes, send point-to-multipoint (P-T-M) business of data to multiple receiving terminals by a data source in wireless network, thereby can provide multicast broadcast multimedia service for the user in wireless area.The advantage of MBMS maximum has been to replace the connection mode of original multichannel clean culture and PTP (point-to-point), avoided repeating to transmit a large amount of identical datas and cause congested in the air.
MBSFN (Multimedia Broadcast Single Frequency Network, multimedia broadcasting single frequency network) is a kind of single frequency network (SFN) transmission means that MBMS introduces in Access Network, i.e. MBSFN transmission means.MBMS business need to be supported MBSFN transmission means in the time supporting many cell transmission, carries out synchronous transmission with same frequency in multiple communities at one time.Use this transmission means can save frequency resource, improve the availability of frequency spectrum.This multiple sectors at same keeps pouring in defeated brought diversity and can solve the problems such as blind area covering simultaneously, strengthens the reliability receiving, and improves coverage rate.Fig. 1 has provided the relation of MBMS service area and MBSFN synchronization zone, and MBMS service area is made up of one or more service identifications, and each mark maps to one or more MBSFN region.
When MBMS UE (comprising the UE that receives MBMS business and the UE that expects to receive MBMS business) is about to move to another MBSFN region by a MBSFN region, or move to this edges of regions in same MBSFN region time, source base station may be initiated community to UE and be switched.At present, LTE (Long Term Evolution, Long Term Evolution) community switch mainly based on cell signal strength this because usually carrying out switch decision, the UE that the measurement report that network can send according to UE need to carry out community switching is preferentially switched to the Target cell that signal strength signal intensity is good.
Obviously, existing community switching criterion is not considered this factor of MBMS business.When just when cell-of-origin receives certain MBMS Service (MBMS business) or waits for that receiving the UE (being referred to as MBMS UE) of certain MBMSService need to carry out community switching, source eNB (Evolved Node B, evolved base station) not necessarily this UE can be switched to the MBMS of its expectation community of Service is provided, because the best community of signal strength signal intensity not necessarily provides the interested MBMS Service of UE.So current handoff procedure may cause the interruption of the MBMS business of UE.
Summary of the invention
The technical problem to be solved in the present invention is to provide the method for the MBMS service continuity of a kind of RRC of guarantee Connected UE, can not cause because of handoff procedure the interruption of the MBMS business of UE.
According to one aspect of the invention, the method for the MBMS service continuity of a kind of UE of the RRC of guarantee connection status is provided, comprising: step 1, source eNB obtain neighbor cell MBMS service configuration information; Step 2, source eNB issue neighbor cell MBMS service configuration information to UE; Step 3, UE carry out mark to neighbor cell that its expectation MBMS business can be provided, and will report source eNB with the measurement report of indication information; Step 4, source eNB determine Target cell in conjunction with the indication information in measurement report and signal strength signal intensity; With step 5, this UE is switched to described Target cell.
Optionally, described step 1 comprises: S111, transmission neighbor cell, eNBXiang neighbor cell, source MBMS service configuration information update request; If this neighbor cell of S112 MBMS service configuration information had renewal apart from last time during request, send MBMS service configuration information updating message, and enter step S113; If do not upgrade, only need to send an indication information, indicate this cell MBMS service configuration information not upgrade; Store this neighbor cell MBMS service configuration information with S113, source eNB.
Optionally, described step 1 comprises: S121, in the time that cell MBMS service configuration information changes, send information to its neighbor cell; Information is received in S122, neighbor cell, sends response message to the community of initiating information, asks its MBMS configuration (being MBMS business configuration) information updating; S123, send MBMS service configuration information to neighbor cell and upgrade; Store this neighbor cell MBMS service configuration information with S124, neighbor cell.
Optionally, described MBMS service configuration information comprises: TMGI, MBSFN region ID, MBMS service identification, MBMS session identification and MBMS service area mark.
Optionally, the indication information in step 3 by adding bit to realize in measurement report.
Optionally, step 3 also comprises: when UE moves to another MBSFN region by a MBSFN region, or UE is while moving to a MBSFN edges of regions, reports trigger mechanism to trigger, reporting measurement reports by measurement.
Optionally, step 3 also comprises: when variation has occurred the MBMS of UE state, and the neighbor cell MBMS configuration information issuing by source eNB finds to provide this UE to expect the neighbor cell of MBMS business, reporting measurement reports.
Optionally, step 4 comprises: the neighbor cell that can provide this UE to expect MBMS business is provided from the indication information of measurement report for step S41, source eNB, and classifies these communities as candidate target cells; Step S42, according to the cell signal quality index comprising in measurement report, sorted in candidate target cells, selecting the wherein top-quality candidate cell of cell signal is Target cell, and the candidate target cells of signal strength signal intensity maximum is Target cell.
Compared with prior art, the invention has the advantages that:
(1) make source eNB can select suitable Target cell in conjunction with indication information and neighbor cell signal strength information in the time carrying out handover decisions, thereby not only guaranteed the MBMS service continuity of UE but also guaranteed user's unicast service quality.
(2) adopt source eNB to send the method for neighbor cell MBMS configuration information to UE, also can be applicable to the situation of UE in RRC Idle state, make RRC Idle state UE also can guarantee the service continuity that its MBMS receives by this information, thereby the MBMS service continuity security mechanism under this two states is consistent as far as possible.
(3) in following two kinds of situations, reporting the measurement report with indication information: situation one) UE is due to reasons such as movements, and radio link quality changes, and is subject to measuring reporting trigger mechanism to trigger, and determines and needs report measurement information; Situation two) UE radio link quality does not change, but the MBMS state of UE changes, and the neighbor cell MBMS service configuration information sending by source eNB finds to provide it to expect the neighbor cell of business.
By reporting in both cases the measurement report with indication information, not only guarantee that the UE that receives MBMS business is carrying out can also continuing the MBMS business that reception is receiving after the switching of community, and make to expect that in cell edge the UE that receives certain MBMS business can be switched and is connected to the neighbor cell that its expectation MBMS business can be provided by community, thereby more perfect assurance the MBMS service continuity of RRC Connected state UE.
Accompanying drawing explanation
Fig. 1 be in prior art MBMS service area and MBSFN synchronization zone be related to schematic diagram;
Fig. 2 is the method flow diagram of the MBMS service continuity of a kind of RRC of guarantee Connected UE of providing according to one embodiment of the invention;
Fig. 3 is that base station sends MBMS business configuration signaling diagram to UE;
Fig. 4 is that UE is in slow mobile context schematic diagram;
Fig. 5 is that UE reports the signaling diagram with the measurement report of indication information.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with accompanying drawing, the present invention is described in more detail.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
At 3GPP LTE, (third generation moves affiliate, long evolving system) with the standard of LTE-A (the follow-up evolution of LTE technology) in, represent base station with eNB, source eNB just refers to the serving BS of UE, namely base station corresponding to UE (user terminal) community, place.A corresponding base station, Yi Ge community.
Inventor finds, in existing multicast service, MBMS business is that the form of broadcasting provides service to the UEs that covers a MBSFN region, network is not also known the MBMS state of UE, such as, UE is receiving MBMS business or is receiving MBMS business waiting for, and is receiving or which MBMS business what expect to receive is.Existing equipment switching method does not provide source base station to obtain the method for subscriber equipment MBMS business reception information, and source base station knows by what mode what business UE is receiving, and how in neighbor cell, to find this business.
Guarantee the MBMS service continuity of RRC Connected UE, this just need to formulate certain mechanism and make source eNB in carrying out handover decisions, can receive or expect in conjunction with UE the MBMS business information of reception.Thereby UE is switched to and can provides it to expect the neighbor cell of MBMS business as far as possible, realize the MBMS service continuity of RRC Connected state UE, that is: the UE that is receiving MBMS business guarantees that it still can continue to receive former business after switching as far as possible, and can switch its interested business that receives by community to the interested UE of certain business.Realize this point, source eNB need to recognize the MBMS business which neighbor cell can provide this UE to expect in handover decisions.Therefore, UE reports certain supplementary and source base station to know that neighbor cell support MBMS service conditions is necessary.
Based on above-mentioned analysis, in one embodiment of the invention, provide the method for the MBMS service continuity of a kind of RRC of guarantee Connected UE.As shown in Figure 2, the method comprises:
S1, source eNB obtain neighbor cell MBMS service configuration information;
S2, source eNB issue neighbor cell MBMS service configuration information to UE;
The MBMS business of its expectation in S3, UE discovering neighbor community, to providing its neighbor cell of expecting MBMS business to carry out mark, and by the measurement report with indication information by UE reporting base station;
Target cell is determined in conjunction with the indication information in measurement report and signal strength signal intensity in S4, base station; With
S5, this UE is switched to Target cell.
Elaborating of above-mentioned steps below.
for step S1(source eNB obtains neighbor cell MBMS service configuration information)
Be up-to-date configuration information in order to make the MBMS service configuration information of the neighbor cell of storing on each base station, can take below two kinds of mode S11 or S12 to make source eNB obtain neighbor cell MBMS service configuration information:
First kind of way S11: in the time that community switching occurs UE in advance, the MBMS service configuration information of request neighbor cell, eNBXiang neighbor cell, source upgrades, and this information at least comprises: TMGI, MBSFN region ID, MBMS service identification, MBMS session identification and MBMS service area mark.In the time that this solicited message is received in neighbor cell, the more new portion of self MBMS service configuration information is sent to source eNB by X2 interface.
First kind of way S11 concrete steps comprise:
S111, transmission neighbor cell, eNBXiang neighbor cell, source MBMS service configuration information update request;
S112, neighbor cell respond this MBMS service configuration information update request message: if this neighbor cell MBMS service configuration information has renewal during asking configuration update message apart from last time, send MBMS service configuration information updating message, and enter step S113; If do not upgrade, only need to send an indication information, indicate this cell MBMS configuration information not upgrade, and enter step S114;
S113, source eNB store this neighbor cell MBMS service configuration information; With
S114, eNBXiang neighbor cell, source send MBMS configuration information acknowledge message, represent successfully to receive this message, and in the eNB of source, have preserved or upgraded.
Second way S12: in the time that each cell MBMS configuration information changes; such as: newly increase certain business, suspend or stop certain business, change of service conversation time started etc.; information is sent in Dou Yaoxiang neighbor cell, this community; inform that variation has occurred its MBMS configuration information of neighbor cell; neighbor cell responds this information again; whether information comprises will ask the more updating message of new portion; if this updating message of neighbor cell request also should indicate which information of request in request message.Send the base station of information in the time receiving solicited message, send this lastest imformation to neighbor cell, this message at least should comprise: TMGI, MBSFN region ID, MBMS service identification, MBMS session identification and MBMS service area mark.Neighbor cell receives this lastest imformation, and it is preserved, and also upgrades the neighbor cell MBMS service configuration information of himself preserving, then sends feedback message to the opposing party, represents to be updated successfully.
Second way S12 concrete steps comprise:
S121: send information to its neighbor cell in the time that cell MBMS configuration information changes;
S122: information is received in neighbor cell, sends response message to the community of initiating information, asks its MBMS configuration information message or configuration information update message;
S123: send MBMS service configuration information updating message to neighbor cell;
S124: this neighbor cell MBMS service configuration information is stored in neighbor cell;
S125: neighbor cell feedback MBMS configuration information acknowledge message, represents successfully to receive this message, and preserved in its base station or upgraded.
By two kinds of mode S11 or S12 above, source eNB just can obtain neighbor cell MBMS service configuration information.
One of ordinary skill in the art will appreciate that, above-mentioned steps S114 and step S125 are that feedback acknowledgment step also can be omitted.
Owing to only having UE oneself to know the MBMS state of oneself, also consider when UE is during in RRCIdle state, its mobility control procedure (as: community is selected and gravity treatment) is controlled by UE, want to guarantee the MBMS service continuity of RRC Idle state UE, UE also needs to know neighbor cell MBMS service configuration information, for the MBMS service continuity security mechanism under this two states is consistent as far as possible, offer UE by eNBJiang neighbor cell, source configuration MBMS service conditions, UE finds the business that oneself is expected in the MBMS configuration information of neighbor cell, then report indication information to base station, carry out the supplementary of switch decision using this as base station, to specifically introduce below.
step S2 (source eNB issues neighbor cell MBMS service configuration information to UE)
In the present embodiment, source eNB sends neighbor cell MBMS configuration information: MBMSConfigurationMessage to UE.
If source eNB sends neighbor cell MBMS configuration information to UE for the first time, this message should at least comprise that its neighbor cell configures the TMGI of MBMS business, MBSFN region ID, MBMS service identification, MBMS session identification and MBMS service area mark;
After sending for the first time neighbor cell configuration information MBMSConfigurationMessage, if neighbor cell MBMS configuration information has renewal, again send the updating message of neighbor cell MBMS configuration information to UE,
That is: send after MBMSConfigurationMessage to UE for the first time at source eNB, MBMSConfigurationMessage below only need send to UE the renewal of neighbor cell MBMS service configuration information.Signaling diagram is as Fig. 3.
(the MBMS business of its expectation in UE discovering neighbor community, to providing its expectation for step S3
mark is carried out in the neighbor cell of MBMS business, and by the measurement report with indication information by UE
report base station)
The neighbor cell MBMS service configuration information issuing by reading source eNB, UE is according to the MBMS business of its expectation in the MBMS interest discovering neighbor community of oneself, and to providing its neighbor cell of expecting MBMS business to carry out mark, in measurement report, add indication information, indication information can be indicated the neighbor cell of the MBMS business that this UE expects, and by the measurement report MeasurementReport with indication information by UE reporting base station.
Indication information can be by adding bit to realize in measurement report, such as the MBMS business that represents that with bit " 1 " this neighbor cell can provide UE to expect.
In addition, as shown in Figure 4, as UE radio link quality of living in constant (as: UE do not move or in slow mobile context), and the MBMS interest of UE is when changing, can not switch, also just can not realize the MBMS business that provides expectation to UE by switching.In Fig. 4, the Serving cell of UE is community A, and this community can not be served for UE provides the MBMS of its expectation by MBSFN mode, the MBMS service that the neighbor cell B of its Serving cell can provide this UE to expect by MBSFN mode.In this scene, if the signal strength signal intensity of UESuo Ce community B can reach certain condition and UE can switch, and be switched to neighbor cell B, just can realize the MBMS business that allows UE receive its expectation.But because UE is in slow mobile context, its radio link quality does not change, and can not cause switching, also just miss the chance of listening to its expectation MBMS business by being switched to community B.
Preferably, in order better to guarantee MBMS service continuity, make the UE of scene shown in Fig. 4 also can better receive the MBMS business of its expectation, the application's motion requires to report the measurement report with indication information by UE in following two kinds of situations, signaling diagram as shown in Figure 5:
Situation one) move to another MBSFN region by a MBSFN region as UE, or UE is while moving to a MBSFN edges of regions, because radio link quality changes etc., is subject to measuring reporting trigger mechanism to trigger, determining needs reporting measurement reports;
Situation two) when UE radio link quality do not change (remain static as UE or under slow mobile context), but variation has occurred the MBMS state of UE, (as: UE stops receiving a MBMS business, and expectation receives another MBMS business), and the neighbor cell MBMS configuration information issuing by source eNB finds to provide this UE to expect the neighbor cell of MBMS business.
In above two kinds of situations, UE reports the measurement report MeasurementReport with indication information, by the measurement report with indication information, source eNB just can know by the indication information reading in measurement report the neighbor cell that provides this UE to expect MBMS business.
step S4 (Target cell is determined in conjunction with the indication information in measurement report and signal strength signal intensity in base station)
In order to guarantee MBMS service continuity, make the UE that receives MBMS business can continue to receive MBMS business after switching, and the UE that expects to receive MBMS business can switch to be connected to by community its expectation MBMS community of business can be provided, in handover decisions, indication information and signal strength signal intensity that source eNB need to consider in the measurement report that UE reports are determined Target cell.Step S4 specifically comprises the following steps:
Step S41: source eNB is provided by the neighbor cell that can provide this UE to expect MBMS business from the indication information of measurement report, and classifies these communities as candidate target cells;
Step S42: according to the cell signal quality index comprising in measurement report, sorted in candidate target cells, selecting the wherein top-quality candidate cell of cell signal is Target cell, and the candidate target cells of signal strength signal intensity maximum is Target cell.
step S5 (this UE is switched to Target cell)
Handover request is sent in eNBXiang Target cell, source, according to the handover operation of existing standard, UE is switched to selected Target cell.
The present invention not only can ensure the MBMS service continuity of RRC Connected UE, and the MBMS business can also realize UE MBMS interest changes in the time of slow mobile context time receives.And the method that the base station of employing issues neighbor cell MBMS configuration information to UE is equally applicable to UE under RRC IDLE (RRC idle condition) state, makes the security mechanism of MBMS service continuity more have consistency.
Should be noted that and understand, in the situation that not departing from the desired the spirit and scope of the present invention of accompanying claim, can make various modifications and improvement to the present invention of foregoing detailed description.Therefore, the scope of claimed technical scheme is not subject to the restriction of given any specific exemplary teachings.
Claims (6)
1. a method that ensures the MBMS service continuity of the UE of RRC connection status, comprising:
Step 1, source eNB obtain neighbor cell MBMS service configuration information; Described step 1 comprises:
S111, transmission neighbor cell, eNBXiang neighbor cell, source MBMS service configuration information update request;
If this neighbor cell of S112 MBMS service configuration information had renewal apart from last time during request, send MBMS service configuration information updating message, and enter step S113; If do not upgrade, only need to send one and indicate the information that this cell MBMS service configuration information does not upgrade;
S113, source eNB store this neighbor cell MBMS service configuration information;
Or described step 1 comprises:
S121, in the time that changing, cell MBMS service configuration information sends information to its neighbor cell;
Information is received in S122, neighbor cell, sends response message to the community of initiating information, asks its MBMS configuration information update;
S123, send MBMS service configuration information to neighbor cell and upgrade;
This neighbor cell MBMS service configuration information is stored in S124, neighbor cell;
Step 2, source eNB issue neighbor cell MBMS service configuration information to UE;
Step 3, UE carry out mark to neighbor cell that its expectation MBMS business can be provided, and will report source eNB with the measurement report of indication information; Wherein, this indication information is used to indicate the neighbor cell of this UE expectation MBMS business;
Step 4, source eNB determine Target cell in conjunction with the indication information in measurement report and signal strength signal intensity; With
Step 5, this UE is switched to described Target cell.
2. method according to claim 1, wherein, described MBMS service configuration information comprises: TMGI, MBSFN region ID, MBMS service identification, MBMS session identification and MBMS service area mark.
3. method according to claim 1, wherein, the indication information in step 3 by adding bit to realize in measurement report.
4. method according to claim 1, wherein, step 3 also comprises:
When UE moves to another MBSFN region by a MBSFN region, or UE is while moving to a MBSFN edges of regions, reports trigger mechanism to trigger, reporting measurement reports by measurement.
5. method according to claim 1, wherein, step 3 also comprises:
When variation has occurred the MBMS of UE state, and the neighbor cell MBMS configuration information issuing by source eNB finds to provide this UE to expect the neighbor cell of MBMS business, reporting measurement reports.
6. method according to claim 1, wherein, step 4 comprises:
The neighbor cell that can provide this UE to expect MBMS business is provided from the indication information of measurement report for step S41, source eNB, and classifies these communities as candidate target cells;
Step S42, according to the cell signal quality index comprising in measurement report, sorted in candidate target cells, selecting the wherein top-quality candidate cell of cell signal is Target cell, and the candidate target cells of signal strength signal intensity maximum is Target cell.
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| WO2016086359A1 (en) * | 2014-12-02 | 2016-06-09 | 华为技术有限公司 | Method for keeping service continuity, base station and system |
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