CN104038904A - Method and system for outer cell reselection of transmission mode multicast single frequency network - Google Patents
Method and system for outer cell reselection of transmission mode multicast single frequency network Download PDFInfo
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Abstract
The invention discloses a method and system for outer cell reselection of a transmission mode multicast single frequency network. The method comprises a first step of judging whether a cell is a transmission mode multicast single frequency network inner cell while judging whether to add the cell to a target set, entering a second step if the cell is not the transmission mode multicast single frequency network inner cell, and entering a third step if the cell is the transmission mode multicast single frequency network inner cell; the second step of starting the transmission mode multicast single frequency network outer cell reselection process; and the third step of starting the transmission mode multicast single frequency network inner cell reselection process. According to the method and system for outer cell reselection of the transmission mode multicast single frequency network, transmission mode multicast single frequency network reference signals are subject to diversity reception. Mobile users can accurately judge channel quality by measuring the quality conditions. The mobile users improve the resource utilization rate by delaying channel switching, the judging accuracy of a target cell is improved, and accordingly the ping-pong effect is reduced. The cell can be added to the single frequency network, multicast services are transmitted through multicast channels, radio resources are saved compared with unicast, and the continuity of the radio resources is also easier to achieve.
Description
Technical field
The present invention relates to field of wireless communication, particularly a kind of outer residence reselecting and system of transmission mode multicast single frequency network.
Background technology
In the Long Term Evolution plan LTE of the mobile communication system being proposed by third generation partner program 3GPP, multimedia broadcast multi-broadcasting business (MBMS, Multimedia Broadcast Multicast Service) is defined as realizing the technical standard of multimedia broadcasting and multicast in Release6 version.After standard formulation in, 3GPP has introduced again the multimedia broadcast multi-broadcasting business (E-MBMS of evolution, Evolved Multimedia Broadcast Multicast Service) standard, by making improvement at aspects such as logical architecture, business model, transmission meanss, further improve Multimedia Broadcast Multicast Service performance in LTE system.E-MBMS has defined multicast broadcast single frequency network (MBSFN) transmission mode multicast single frequency network (MBSFN) as emerging multicast service transmission mode, with traditional P ?T ?P and P ?T ?M transmission means compare, can save greatly frequency resource and improve the availability of frequency spectrum, but when transmission mode multicast single frequency network, need the cooperation of many communities with the RRM that keeps pouring in defeated character and make transmission mode multicast single frequency network and be no longer the RRM of traditional single subdistrict, the transmission feature of transmission mode multicast single frequency network has brought new challenge to RRM.
Trunked communication system, all users that the available channel that system has can be system share, and have automatic selective channel function, and it is the multipurpose of shared resource, contribution, shared channel equipment and service, dynamical wireless dispatching communication system.
In transmission mode multicast single frequency network in LTE system, build group system efficiently high texture realize multimedia broadcast multicast service transmission.LTE system provides very high transmission rate, can meet multimedia service demand.But in high-speed transfer, also should ensure the mobile continuity of customer service.
In traditional cell reselection, Idle state mobile subscriber does not receive any business, its reselection algorithm is also just in order to ensure that free subscriber does not produce cell lost. but in transmission mode multicast mono-frequency network system, Idle state user also can receiving multicast traffic, therefore, free subscriber cell lost, also needs to ensure the continuity of multicast service except ensureing not.
Simultaneously, in transmission mode multicast single frequency network, the transmission of multicast service has the diversity gain from multiple communities, and conventional cell selection consideration is the signal strength signal intensity of cell special reference, be not sufficient to ensure the judgement of the Multicast Channel quality condition to Idle state user, waste resource or produce unnecessary switching thereby may carry out ahead of time channel switching in the time that Multicast Channel quality can also ensure multicast service in the time of cell reselection.
Summary of the invention
The present invention addresses the above problem, and provides a kind of transmission mode multicast single frequency network reference signal that adopts to replace cell reference signals to judge outer residence reselecting and the system of the transmission mode multicast single frequency network of the channel quality of Multicast Channel.
The outer residence reselecting of transmission mode multicast single frequency network of the present invention, comprises following process:
Step 1, take a decision as to whether in transmission mode multicast single frequency network community and determine whether simultaneously and add object set, judge it is not to enter step 2, judgement is to enter step 3;
Step 2, the outer cell reselection process of startup transmission mode multicast single frequency network;
Cell reselection process in step 3, startup transmission mode multicast single frequency network.
Further, the decision process of described step 1 is:
Step S201, start-up period scanning, Target cell collection is set to sky; The reason of start-up period scanning be mobile subscriber source base station detected cell signal strength lower than threshold value Halert;
Step S202, judge whether peripheral cell belongs to transmission mode multicast single frequency network Wai community; Being to enter step S203, is not to enter step S204; Decision method is: the multicast service situation of Idle state user periodic broadcasting peripheral cell below it by broadcast mode, each base station, Idle state user can judge the multicast service whether peripheral cell need to receive by this user of transmission mode multicast single-frequency network transmission by this message.Not by the community of this multicast service of transmission mode multicast single-frequency network transmission, for the outer community of transmission mode multicast single frequency network, be community in transmission mode multicast single frequency network by the community of this multicast service of transmission mode multicast single-frequency network transmission;
Whether step S203, judgement peripheral cell meet the condition of the outer Target cell of transmission mode multicast single frequency network, are to enter step S205;
Whether step S204, judgement peripheral cell meet the condition of transmission mode multicast single frequency network internal object community, are to enter step S205;
Step S205, peripheral cell is added to object set, carry out descending according to cell special reference intensity, carry out step 2 or step 3 according to whether belonging to community in transmission mode multicast single frequency network.
Further, described step S203 determines whether that the method for Target cell is: RSRP satisfies condition
mBSFN<H
rSRQand RSRP
n-RSRP
s>H
rSRP, and duration T, be defined as Target cell; Wherein RSRP
mBSFNthe Multicast Channel quality intensity of cell-of-origin in the transmission mode multicast single frequency network recording by transmission mode multicast single frequency network reference signal for mobile subscriber, H
rSRQfor the state threshold of Multicast Channel (PMCH), H
rSRPfor cell signal strength hysteresis margin, T is the duration, sets by network side.
Further, described step S204 determines whether that the method for Target cell is: use RSRP
srepresent the cell special reference intensity of cell-of-origin, RSRP
nrepresent the cell special reference intensity of peripheral cell, if satisfy condition RSRP
n-RSRP
s>H and duration T, just confirm as Target cell; Wherein H represents hysteresis margin, and T is the duration, sets by network side.
Further, the process of described step S205 is: if certain adjacent cell meets Target cell decision condition, add Target cell collection.Concentrate and carry out descending according to cell special reference intensity in Target cell, if exist the interior community of transmission mode multicast single frequency network and the outer community of transmission mode multicast single frequency network to meet Target cell condition simultaneously, before the outer community of transmission mode multicast single frequency network comes the interior community of transmission mode multicast single frequency network.After Target cell collection has judged, which kind of reuse adoption process mobile subscriber can start according to the content judgement of Target cell collection.
Further, described step 2 process is:
Step S301, judge that whether target tightening the first community is the outer community of transmission mode multicast single frequency network, be to start the outer cell reselection process of transmission mode multicast single frequency network;
Whether step S302, judgement Target cell change, and are to enter step S303, the no step S304 that enters;
Step S303, startup RRC connect, and transmit the transmission mode multicast single frequency network outward flange cell list of target tightening to source base station, then enter step S304;
Step S304, determine whether arrive transmission mode multicast single frequency network border, be to enter step S305, the no step S301 that returns;
Step S305, judge whether the non-competing lead code of selected community is empty, is to start channel and switch; No startup cell reselection.
Further, for mobile subscriber is not activated, RRC connected transmission Target cell collection to the method for described step S302 or Target cell concentrates appearance better than selected target community, exist and come community before, selected target community, and the not MBSFN outward flange community among blacklist, judges that selected target community may change.
Further, the process of described step S303 is: mobile subscriber sends after the collection of Target cell, can wait for target base station resources preparation success message.And source base station is received after the collection of Target cell, selecting successively Target cell, to notify it be that user prepares resource, can reserve resource until there is Target cell, if outside transmission mode multicast single frequency network edge, community exhausts in cell set, now notify mobile subscriber's resource to prepare unsuccessfully, if have community to reserve resource, cancel resource reservation before.Mobile subscriber receives these failed communities to be concentrated from Target cell after failure notification and deletes and add blacklist, after intermittent scanning process in, can select not scan blacklist Zhong community, if receive the non-competing lead code of Target cell before, deleted, entered afterwards step S304; If resource can successfully be reserved in certain base station, to choose this community be selected target community, reserve resource if there are other different districts before, cancel the resource reservation of this community, and requiring the non-competing lead code of the reserved resource in selected target community and transmission Target cell to source base station, source base station can send to user by this lead code.User can replace old lead code by new lead code.
Further, the process of described step S304 is the reference signal of detected transmission pattern multicast single frequency network, if user records the transmission mode multicast single frequency network reference signal RSRQ that satisfies condition
mBSFN<H
eDGE+ Δ, wherein H
eDGEfor meeting the lowest channel quality of multicast service, Δ is that redundancy value is set by network side, and duration T
2, T
2set by network side, judge that user is about to shift out MBSFN, mobile subscriber has arrived the moment that needs channel to switch.If but do not reach this moment, and selected target community is definite, jump to Target cell collection decision process next time, if selected target community is not determined, concentrate Target cell also has community in MBSFN, start cell reselection process in MBSFN, otherwise start Target cell collection decision process, start the cell reselection all processes of a new round.
The outer cell reselection system of transmission mode multicast single frequency network of the present invention, comprises cell reselection module and the outer cell reselection module of transmission mode multicast single frequency network in object set determination module, transmission mode multicast single frequency network; Object set determination module is connected with the outer cell reselection module of cell reselection module in transmission mode multicast single frequency network and transmission mode multicast single frequency network respectively.
In sum, the outer residence reselecting of transmission mode multicast single frequency network of the present invention and system adopt transmission mode multicast single frequency network reference signal to replace cell reference signals to judge the channel quality of Multicast Channel, because transmission mode multicast single frequency network reference signal subcarrier is irrelevant at absolute position and the community ID of frequency domain, each cell special reference, at identical frequency domain position, can realize the grand diversity reception of the different districts DRS (Dedicated Reference Signal) in the set of transmission mode multicast single frequency network.Mobile subscriber can record the quality condition that adds the Multicast Channel after diversity gain by transmission mode multicast single frequency network reference signal, thereby accurately judges the channel quality of Multicast Channel.Channel is switched to the moment of postponing till Multicast Channel and just can meet multicast service simultaneously, before this, mobile subscriber is by Multicast Channel receiving multicast traffic, can improve the utilance of multicast resource, postpone channel simultaneously and switch the accuracy that can increase Target cell judgement, thereby reduce the ping-pong of cell reselection.In the time using the quantity of mode of unicast receiving multicast traffic to increase in community outside transmission mode multicast single frequency network, can add single frequency network (transmission mode multicast single frequency network) in Jiang Gai community, add single frequency network to transmit multicast service by Multicast Channel community, Radio Resource has been saved in clean culture relatively, simultaneously, add transmission mode multicast single frequency network, this community becomes community in transmission mode multicast single frequency network, ensures that its continuity has also more easily realized.
Brief description of the drawings
Fig. 1 is the schematic diagram of the outer cell reselection system of transmission mode multicast single frequency network;
Fig. 2 is Target cell collection decision flowchart;
Fig. 3 is the outer cell re-selection procedure figure of transmission mode multicast single frequency network;
Fig. 4 is cell re-selection procedure figure in transmission mode multicast single frequency network;
Tu5Wei community adds the flow chart of transmission mode multicast single frequency network.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, the invention will be further elaborated.
For the multicast users in transmission mode multicast single frequency network edge cell, the Target cell of its cell reselection is divided into two classes, community in a class transmission mode multicast single frequency network, and a class is the outer community of transmission mode multicast single frequency network.For transmission mode multicast single frequency network Nei community, each community is all at the same time with keeping pouring in defeated identical multicast service, and mobile subscriber when move minizone in transmission mode multicast single frequency network, can not have influence on the reception to its multicast service.Therefore, for the gravity treatment of the minizone in transmission mode multicast single frequency network, because transmission mode multicast single-frequency network transmission characteristic can well ensure the continuity of its multicast service can adopt general cell reselection process.
If mobile subscriber wants gravity treatment to transmission mode multicast single frequency network Wai community, owing to not transmitting this multicast service or with this multicast service of unicast transmission in transmission mode multicast single frequency network Wai community, so mobile subscriber is before shifting out transmission mode multicast single frequency network, first needing to set up RRC with source base station is connected, allow source base station notification target base station be ready to unicast resource, by the time when mobile subscriber shifts out transmission mode multicast single frequency network, can access fast Target cell, thereby ensure the continuity of business by unicast tunnel receiving multicast traffic.
Simultaneously for will gravity treatment arriving the mobile subscriber outside transmission mode multicast single frequency network, the Multicast Channel quality state that judges transmission mode multicast single frequency network by measuring transmission mode multicast single frequency network reference signal just starts channel and switches in the time that Multicast Channel cannot meet multiservice requirement.Judge Multicast Channel state by transmission mode multicast single frequency network reference signal like this, can effectively judge the border of transmission mode multicast single frequency network, and carry out channel switching on border, and reduce the ping-pong of cell reselection, effectively utilize multicast resource.Be finally the resource of effectively saving the outer community of transmission mode multicast single frequency network, in the time using the quantity of mode of unicast receiving multicast traffic to increase in community outside transmission mode multicast single frequency network, Jiang Gai community adds transmission mode multicast single frequency network.
As shown in Figure 1, the outer cell reselection system of transmission mode multicast single frequency network of the present invention, comprises cell reselection module and the outer cell reselection module of transmission mode multicast single frequency network in object set determination module, transmission mode multicast single frequency network; Object set determination module is connected with the outer cell reselection module of cell reselection module in transmission mode multicast single frequency network and transmission mode multicast single frequency network respectively.
As shown in Figure 2, the now inward flange community of Idle state user in transmission mode multicast single frequency network, Yu Gai community next-door neighbour's community has transmission mode multicast single frequency network Nei community also to have transmission mode multicast single frequency network Wai community, this is to start determination flow, process following steps S201, start-up period scanning, Target cell collection is set to sky; The reason of start-up period scanning be mobile subscriber source base station detected cell signal strength lower than threshold value Halert;
Step S202, judge whether peripheral cell belongs to transmission mode multicast single frequency network Wai community; Being to enter step S203, is not to enter step S204; Decision method is: the multicast service situation of Idle state user periodic broadcasting peripheral cell below it by broadcast mode, each base station, Idle state user can judge the multicast service whether peripheral cell need to receive by this user of transmission mode multicast single-frequency network transmission by this message.Not by the community of this multicast service of transmission mode multicast single-frequency network transmission, for the outer community of transmission mode multicast single frequency network, be community in transmission mode multicast single frequency network by the community of this multicast service of transmission mode multicast single-frequency network transmission;
Whether step S203, judgement peripheral cell meet the condition of the outer Target cell of transmission mode multicast single frequency network, are to enter step S205; The method that determines whether Target cell is: RSRP satisfies condition
mBSFN<H
rSRQand RSRP
n-RSRP
s>H
rSRP, and duration T, be defined as Target cell; Wherein RSRP
mBSFNthe Multicast Channel quality intensity of cell-of-origin in the transmission mode multicast single frequency network recording by transmission mode multicast single frequency network reference signal for mobile subscriber, H
rSRQfor the state threshold of Multicast Channel (PMCH), H
rSRPfor cell signal strength hysteresis margin, T is the duration, sets by network side.
Whether step S204, judgement peripheral cell meet the condition of transmission mode multicast single frequency network internal object community, are to enter step S205; The method that determines whether Target cell is: use RSRP
srepresent the cell special reference intensity of cell-of-origin, RSRP
nrepresent the cell special reference intensity of peripheral cell, if satisfy condition RSRP
n-RSRP
s>H and duration T, just confirm as Target cell; Wherein H represents hysteresis margin, and T is the duration, sets by network side.
Step S205, peripheral cell is added to object set, carry out descending according to cell special reference intensity, carry out step 2 or step 3 according to whether belonging to community in transmission mode multicast single frequency network.Process is: if certain adjacent cell meets Target cell decision condition, add Target cell collection.Concentrate and carry out descending according to cell special reference intensity in Target cell, if exist the interior community of transmission mode multicast single frequency network and the outer community of transmission mode multicast single frequency network to meet Target cell condition simultaneously, before the outer community of transmission mode multicast single frequency network comes the interior community of transmission mode multicast single frequency network.After Target cell collection has judged, which kind of reuse adoption process mobile subscriber can start according to the content judgement of Target cell collection.
As shown in Figure 3, carry out Target cell collection judgement according to Fig. 2 process, after Target cell collection is determined, be transmission mode multicast single frequency network outward flange community if first community is concentrated in Target cell, start transmission mode multicast single frequency network outward flange cell reselection.Flow process is as follows:
Step S301, judge that whether target tightening the first community is the outer community of transmission mode multicast single frequency network, be to start the outer cell reselection process of transmission mode multicast single frequency network;
Whether step S302, judgement Target cell change, and are to enter step S303, the no step S304 that enters; For mobile subscriber is not activated, RRC connected transmission Target cell collection to method or Target cell concentrates appearance better than selected target community, exist and come community before, selected target community, and the not MBSFN outward flange community among blacklist, judges that selected target community may change.
Step S303, startup RRC connect, and transmit the transmission mode multicast single frequency network outward flange cell list of target tightening to source base station, then enter step S304; Process is: mobile subscriber sends after the collection of Target cell, can wait for target base station resources preparation success message.And source base station is received after the collection of Target cell, selecting successively Target cell, to notify it be that user prepares resource, can reserve resource until there is Target cell, if outside transmission mode multicast single frequency network edge, community exhausts in cell set, now notify mobile subscriber's resource to prepare unsuccessfully, if have community to reserve resource, cancel resource reservation before.Mobile subscriber receives these failed communities to be concentrated from Target cell after failure notification and deletes and add blacklist, after intermittent scanning process in, can select not scan blacklist Zhong community, if receive the non-competing lead code of Target cell before, deleted, entered afterwards step S304; If resource can successfully be reserved in certain base station, to choose this community be selected target community, reserve resource if there are other different districts before, cancel the resource reservation of this community, and requiring the non-competing lead code of the reserved resource in selected target community and transmission Target cell to source base station, source base station can send to user by this lead code.User can replace old lead code by new lead code.
Step S304, determine whether arrive transmission mode multicast single frequency network border, be to enter step S305, the no step S301 that returns; Process is the reference signal of detected transmission pattern multicast single frequency network, if user records the transmission mode multicast single frequency network reference signal RSRQ that satisfies condition
mBSFN<H
eDGE+ Δ, wherein H
eDGEfor meeting the lowest channel quality of multicast service, Δ is that redundancy value is set by network side, and duration T
2, T
2set by network side, judge that user is about to shift out MBSFN, mobile subscriber has arrived the moment that needs channel to switch.If but do not reach this moment, and selected target community is definite, jump to Target cell collection decision process next time, if selected target community is not determined, concentrate Target cell also has community in MBSFN, start cell reselection process in MBSFN, otherwise start Target cell collection decision process, start the cell reselection all processes of a new round.
Step S305, judge whether the non-competing lead code of selected community is empty, is to start channel and switch; No startup cell reselection.
As shown in Figure 4, carry out Target cell collection judgement according to Fig. 2 process, after Target cell collection is determined, if it is community in transmission mode multicast single frequency network that first community is concentrated in Target cell, Target cell is concentrated in first transmission mode multicast single frequency network community as selected target community, and start transmission mode multicast single frequency network outward flange cell reselection.Process is:
Step S401, judging that whether target tightening the first community is community in transmission mode multicast single frequency network, is to start the outer cell reselection process of transmission mode multicast single frequency network;
Step S402, having judged whether that Target cell is the reserved resource of user, is to enter step S403, the no step S405 that directly enters; Determination methods is: if mobile subscriber's the non-competing lead code in selected community for empty, judges that peripheral cell is not the reserved resource of this user before this.
Step S403, startup RRC link, resource reservation is cancelled in notification target community; Enter next step;
Step S404, start general cell reselection.
As shown in Figure 5, along with the carrying out of the outer cell reselection of transmission mode multicast single frequency network, in the outer community of transmission mode multicast single frequency network, the number of users of receiving multicast traffic may get more and more, when number reaches after certain value, can add single frequency network in Jiang Gai community, to economize on resources, and reduce the idle condition user complexity that continuity ensures while moving across community, process is:
Step S501: total family N of the multicast users of having prepared resource but do not access and accessed is calculated in judgement.
Step S502: if total N is greater than N
max, and judge that this community has the ability to realize single-frequency network transmission, send and add the request of defeated pattern multicast single frequency network to MCE.Wherein N
maxset by network side.
Step S503: wait for and receive MCE message, if MCE adheres to, can send to this base station defeated pattern multicast single frequency network parameter, otherwise, send exclude information.
Step S504: this base station judges whether to access single frequency network according to the MCE information of receiving.
Step S505: if agree to, carry out the setting of single frequency network parameter, add single frequency network; Cancel the unicast resource of institute's promising multicast service preparation, and use multicast transmission multicast service; Otherwise do not add single frequency network, and no longer proceed whether to add the judgement of defeated pattern multicast single frequency network for this business.
Those of ordinary skill in the art will appreciate that, embodiment described here is in order to help reader understanding's principle of the present invention, should be understood to that protection scope of the present invention is not limited to such special statement and embodiment.Those of ordinary skill in the art can make various other various concrete distortion and combinations that do not depart from essence of the present invention according to these technology enlightenments disclosed by the invention, and these distortion and combination are still in protection scope of the present invention.
Claims (10)
1. an outer residence reselecting for transmission mode multicast single frequency network, is characterized in that, comprises following process:
Step 1, take a decision as to whether in transmission mode multicast single frequency network community and determine whether simultaneously and add object set, judge it is not to enter step 2, judgement is to enter step 3;
Step 2, the outer cell reselection process of startup transmission mode multicast single frequency network;
Cell reselection process in step 3, startup transmission mode multicast single frequency network.
2. the outer residence reselecting of transmission mode multicast single frequency network as claimed in claim 1, is characterized in that: the decision process of described step 1 is:
Step S201, start-up period scanning, Target cell collection is set to sky; The reason of start-up period scanning be mobile subscriber source base station detected cell signal strength lower than threshold value Halert;
Step S202, judge whether peripheral cell belongs to transmission mode multicast single frequency network Wai community; Being to enter step S203, is not to enter step S204; Decision method is: the multicast service situation of Idle state user periodic broadcasting peripheral cell below it by broadcast mode, each base station, Idle state user can judge the multicast service whether peripheral cell need to receive by this user of transmission mode multicast single-frequency network transmission by this message.Not by the community of this multicast service of transmission mode multicast single-frequency network transmission, for the outer community of transmission mode multicast single frequency network, be community in transmission mode multicast single frequency network by the community of this multicast service of transmission mode multicast single-frequency network transmission;
Whether step S203, judgement peripheral cell meet the condition of the outer Target cell of transmission mode multicast single frequency network, are to enter step S205;
Whether step S204, judgement peripheral cell meet the condition of transmission mode multicast single frequency network internal object community, are to enter step S205;
Step S205, peripheral cell is added to object set, carry out descending according to cell special reference intensity, whether first community of concentrating according to Target cell belongs to community in transmission mode multicast single frequency network is carried out step 2 or step 3.
3. the outer residence reselecting of transmission mode multicast single frequency network as claimed in claim 2, is characterized in that: described step S203 determines whether that the method for Target cell is: RSRP satisfies condition
mBSFN<H
rSRQand RSRP
n-RSRP
s>H
rSRP, and duration T, be defined as Target cell; Wherein RSRP
mBSFNthe Multicast Channel quality intensity of cell-of-origin in the transmission mode multicast single frequency network recording by transmission mode multicast single frequency network reference signal for mobile subscriber, H
rSRQfor the state threshold of Multicast Channel (PMCH), H
rSRPfor cell signal strength hysteresis margin, T is the duration, sets by network side.
4. the outer residence reselecting of transmission mode multicast single frequency network as claimed in claim 2, is characterized in that: described step S204 determines whether that the method for Target cell is: use RSRP
srepresent the cell special reference intensity of cell-of-origin, RSRP
nrepresent the cell special reference intensity of peripheral cell, if satisfy condition RSRP
n-RSRP
s>H and duration T, just confirm as Target cell; Wherein H represents hysteresis margin, and T is the duration, sets by network side.
5. the outer residence reselecting of transmission mode multicast single frequency network as claimed in claim 2, is characterized in that: the process of described step S205 is: if certain adjacent cell meets Target cell decision condition, add Target cell collection.Concentrate and carry out descending according to cell special reference intensity in Target cell, if exist the interior community of transmission mode multicast single frequency network and the outer community of transmission mode multicast single frequency network to meet Target cell condition simultaneously, before the outer community of transmission mode multicast single frequency network comes the interior community of transmission mode multicast single frequency network.After Target cell collection has judged, which kind of reuse adoption process mobile subscriber can start according to the content judgement of Target cell collection.
6. the outer residence reselecting of transmission mode multicast single frequency network as claimed in claim 1, is characterized in that: described step 2 process is:
Step S301, judge that whether target tightening the first community is the outer community of transmission mode multicast single frequency network, be to start the outer cell reselection process of transmission mode multicast single frequency network;
Whether step S302, judgement Target cell change, and are to enter step S303, the no step S304 that enters;
Step S303, startup RRC connect, and transmit the transmission mode multicast single frequency network outward flange cell list of target tightening to source base station, then enter step S304;
Step S304, determine whether arrive transmission mode multicast single frequency network border, be to enter step S305, the no step S301 that returns;
Step S305, judge whether the non-competing lead code of selected community is empty, is to start channel and switch; No startup cell reselection.
7. the outer residence reselecting of transmission mode multicast single frequency network as claimed in claim 6, it is characterized in that: for mobile subscriber is not activated, RRC connected transmission Target cell collection to the method for described step S302 or Target cell concentrates appearance better than selected target community, exist and come community before, selected target community, and the not MBSFN outward flange community among blacklist, judges that selected target community may change.
8. the outer residence reselecting of transmission mode multicast single frequency network as claimed in claim 6, is characterized in that: the process of described step S303 is: mobile subscriber sends after the collection of Target cell, can wait for target base station resources preparation success message.And source base station is received after the collection of Target cell, selecting successively Target cell, to notify it be that user prepares resource, can reserve resource until there is Target cell, if outside transmission mode multicast single frequency network edge, community exhausts in cell set, now notify mobile subscriber's resource to prepare unsuccessfully, if have community to reserve resource, cancel resource reservation before.Mobile subscriber receives these failed communities to be concentrated from Target cell after failure notification and deletes and add blacklist, after intermittent scanning process in, can select not scan blacklist Zhong community, if receive the non-competing lead code of Target cell before, deleted, entered afterwards step S304; If resource can successfully be reserved in certain base station, to choose this community be selected target community, reserve resource if there are other different districts before, cancel the resource reservation of this community, and requiring the non-competing lead code of the reserved resource in selected target community and transmission Target cell to source base station, source base station can send to user by this lead code.User can replace old lead code by new lead code.
9. the outer residence reselecting of transmission mode multicast single frequency network as claimed in claim 6, it is characterized in that: the process of described step S304 is the reference signal of detected transmission pattern multicast single frequency network, if user records the transmission mode multicast single frequency network reference signal RSRQ that satisfies condition
mBSFN<H
eDGE+ Δ, wherein H
eDGEfor meeting the lowest channel quality of multicast service, Δ is that redundancy value is set by network side, and duration T
2, T
2set by network side, judge that user is about to shift out MBSFN, mobile subscriber has arrived the moment that needs channel to switch.If but do not reach this moment, and selected target community is definite, jump to Target cell collection decision process next time, if selected target community is not determined, concentrate Target cell also has community in MBSFN, start cell reselection process in MBSFN, otherwise start Target cell collection decision process, start the cell reselection all processes of a new round.
10. an outer cell reselection system for transmission mode multicast single frequency network, is characterized in that: comprise cell reselection module and the outer cell reselection module of transmission mode multicast single frequency network in object set determination module, transmission mode multicast single frequency network; Object set determination module is connected with the outer cell reselection module of cell reselection module in transmission mode multicast single frequency network and transmission mode multicast single frequency network respectively.
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