CN101505452B - Mapping method for uni-frequency network region - Google Patents
Mapping method for uni-frequency network region Download PDFInfo
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- CN101505452B CN101505452B CN2008100652955A CN200810065295A CN101505452B CN 101505452 B CN101505452 B CN 101505452B CN 2008100652955 A CN2008100652955 A CN 2008100652955A CN 200810065295 A CN200810065295 A CN 200810065295A CN 101505452 B CN101505452 B CN 101505452B
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- 238000013507 mapping Methods 0.000 title claims abstract description 17
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- 230000008878 coupling Effects 0.000 claims description 3
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- 101100502339 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) SFA1 gene Proteins 0.000 description 107
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Abstract
The invention discloses a mapping method for single-frequency network areas. The method comprises the following steps that: a multicast coordination entity MCE receives N session-start request messages which include service-area parameters and are sent by a core network CN, wherein N is more than or equal to 2; the MCE selects a single-frequency network area SFA template, matches a cell which is indicated by the service-area parameters of N sessions with the SFA template, and ensures that an intersection part is an SFA; and the MCE allocates physical resource blocks PRB to the SFA of the N sessions. The invention also provides the multicast coordination entity which comprises a receiving-sending module, a memory module and an execution module. The method has the advantages of raising subframe-utilizing rate and saving empty-port resources.
Description
Technical field
The present invention relates to wireless communication field, relate in particular to a kind of mapping method of single-frequency network area.
Background technology
Multimedia broadcasting multimedia service (Multimedia Broadcast Multicast Service; MBMS) first at UMTS (Universal Mobile TelecommunicationsSystem; UMTS) introduce in the R6 version; MBMS be meant through share a transmission link multi-medium data through broadcasting or multicast pattern send to subscriber equipment (User Equipment, UE).Wherein, broadcast mode is meant multi-medium data from a service source by unidirectional all the inner UE of broadcast service zone that send to.UE under this pattern need not registration can receive broadcast data, and this broadcast mode is save radio resources effectively, but can't guarantee the integrality of the data that UE receives.Multicast pattern and broadcast mode are very similar, but the UE that in the multicast pattern, can receive multi-case data is only limited to registered UE that should business.As the UE that receives multi-case data in the sub-district seldom the time, can select that point-to-point (PointTo Point, radio bearer mode PTP) is sent multi-case data, to reduce the interference to other Radio Link.
Long Term Evolution (Long Term Evolution; LTE) system is the evolution standard based on the UMTS network that 3GPP organizes to set up; When radio network technique develops into the LTE system, MBMS also developed into enhanced multimedia broadcast and multicast services (Enhanced-MBMS, E-MBMS).Very big variation has taken place in the framework of E-MBMS on the basis of MBMS; One of them is to have introduced SFN (Single Frequency Network; SFN) notion, it requires some adjacent evolution base stations, and (Evolved Node B is eNB) in the identical time; With the same wireless resource of same frequency band, send identical content.Can make UE receive the signal of enhancing like this, improve reception.These adjacent zones that eNB constituted be called single-frequency network area (SFN Area, SFA).
In the R8 of LTE version, confirm that SFA is static zone, eNB that it comprises and sub-district can not change in the process that session is carried out.In session at first; Core net (Core Network; CN) begin to carry in the message service area (Service Area) parameter that session comprises in session, the service area of this parameter indication session is confirmed professional sub-district of MBMS and the zone of carrying out the SFN transmission by Access Network.
Introduced in the E-MBMS system multicast coordination entity (Multi-cell/multicast CoordinationEntity, MCE), MCE participates in session management procedure, is illustrated in figure 1 as the session schematic flow sheet, this flow process may further comprise the steps:
Step 101:CN sends MBMS session beginning request message 1 to MCE;
Step 102:MCE replys the MBMS session to CN and begins response message 1;
Step 103:MCE sends MBMS session beginning request message 2 to eNB;
Step 104:eNB replys the MBMS session to MCE and begins response message 2.
The MBMS session that CN issues begins to comprise in the request message 1 service area (Service area) parameter; MCE control has the scope situation of MBMS SFN (MBMSFN) retaining zone; After MCE receives this request message; Need the sub-district of the sub-district in the service area and self control be mated, belong to the sub-district in MBSFN zone in the sub-district with self control and also belong to sub-district in the service area and separate and carry out the SFN transmission; And in the sub-district of self control, do not belong to the sub-district in MBSFN zone but single cell transmission is carried out in the sub-district that belongs in the service area.MCE need begin to indicate in the request message 2 above-mentioned information in the MBMS session of sending to eNB.It is as shown in Figure 2 to use this scheme to carry out the method that SFN transmission means and single cell transmission mode divide.
MCE can be easy to the sub-district in the service area is mapped to static SFA and non-SFA.But CN is confirmed by CN in the scope that issues the service area that attaches when session begins to ask; CN is when confirming this scope and do not know the distribution situation of MBSFN, so the scope of the MBSFN that controlled of this service area scope and MCE is fully independently, when MCE receives a plurality of sessions of carrying different service area range parameters when beginning to ask; MCE is through the SFN mapping; Obtain a plurality of different SFA, carry out the SFN transmission respectively, and MCE is after the scope of decision SFA; Need in the sub-district of this scope, set up identical MCH; And need begin to carry in the request message physical resource that distributes into this MCH in the session of Fig. 1 step 103, mainly comprise Physical Resource Block on subframe and this subframe (Physical Resource Block, PRB).And when the SFA of a plurality of sessions not simultaneously, the subframe of its distribution must be different, are illustrated in figure 3 as the distribution situation of physical resource in this case.Can know that by Fig. 3 the remaining PRB resource of 2 work song frames can not obtain utilizing, and has caused the very big waste of interface-free resources.
Summary of the invention
The purpose of the embodiment of the invention provides a kind of mapping method of single-frequency network area, is the problem that a plurality of sessions cause the interface-free resources waste when distributing physical resource to solve MCE.
In view of this, the invention provides a kind of mapping method of single-frequency network area, this method comprises: the session that multicast coordination entity MCE receives the N that comprises a service area parameter session of core net CN transmission begins request message, wherein N >=2; MCE selects single-frequency network area SFA masterplate, and the sub-district that the service area parameter of a said N session is indicated matees with said SFN masterplate, and common factor is SFA partly; MCE is that the SFA of a said N session distributes Physical Resource Block PRB; Said SFA masterplate is the part set of cells in the multimedia broadcasting multimedia service SFN MBSFN zone of said MCE control.
The present invention also provides a kind of multicast coordination entity, and this multicast coordination entity comprises that the session that said transceiver module is used to receive N the session that CN sends begins to ask, wherein N >=2; Said memory module is used to store the SFA masterplate; Said Executive Module is used to select the SFA masterplate, is used for sub-district and said SFA masterplate that the service area with a said N session comprises and matees, and the part of occuring simultaneously be SFA, is used to the SFA distribution PRB resource of a said N session.
Technical scheme through the present invention's realization; Can be so that when MCE receives a plurality of conversation request; MCE is that a plurality of conversational services district carries out the SFA standardization that SFA mapping back is obtained, thereby makes when MCE is the SFN region allocation resource of each session, can distribute the PRB resource on the sub-frame for the identical SFA of a plurality of sessions; Improve the utilance of subframe, saved interface-free resources.
Description of drawings
Fig. 1 is the schematic flow sheet of session management in the prior art;
Fig. 2 is the mapping method sketch map of single-frequency network area in the prior art;
Fig. 3 is the distribution sketch map of PRB resource in the prior art;
Fig. 4 is the single-frequency network area masterplate sketch map of the embodiment of the invention;
Fig. 5 is the schematic flow sheet of the embodiment of the invention one;
Fig. 6 is the mapping method sketch map of the SFN of the embodiment of the invention one;
Fig. 7 is the distribution sketch map of PRB resource in the embodiment of the invention one;
Fig. 8 uses existing method to carry out the contrast sketch map of SFN mapping in the embodiment of the invention;
Fig. 9 is the sketch map that uses existing method to carry out the PRB resource allocation in the embodiment of the invention;
Figure 10 is the schematic flow sheet of the embodiment of the invention two;
Figure 11 is the mapping method sketch map of the SFN of the embodiment of the invention two;
Figure 12 is the distribution sketch map of PRB resource in the embodiment of the invention two;
Figure 13 is the structural representation of multicast coordination entity in the embodiment of the invention.
Embodiment
Clearer for the purpose, technical scheme and the beneficial effect that make inventive embodiments, will combine accompanying drawing that the embodiment of the embodiment of the invention is elaborated below.
The embodiment of the invention at first provides a kind of method of SFA masterplate design.Static configuration SFA masterplate in MCE, these SFA masterplates are a part of sub-districts in the MBSFN zone controlled of MCE, are illustrated in figure 4 as the division sketch map of SFA masterplate in the embodiment of the invention.At first the quantity of SFA masterplate should be an amount of.If the quantity of masterplate is very few, MCE lacks flexibility to the distribution of resource, and to belong to the regional cell area difference of MBSFN in SFA that actual match obtains and the session service area very big but also can cause; If the quantity of masterplate is too much, at first matching process is complicated, and MCE carries out the coordination committee of resource between numerous SFA very complicated.
Secondly; Access Network is determining when two ways is carried out the SFN transmission; What need consideration is the characteristic in zone, and it is in order to make the user obtain better user's impression, so can at first consider typical user concentrated area is designed to a SFA masterplate separately that the SFN transmission is provided.Can be designed to independent SFA masterplate such as commercial center, concentrated Administrative Area, university etc.And zone that some are remoter, customer volume is few and blind spot overlay area can not dispose the SFA masterplate.
The 3rd, can have overlapping or inclusion relation between SFA masterplate and the SFA masterplate, have independently such as several megastore of certain commercial center that the SFA masterplate covers, and whole commercial center can be configured to a big SFA masterplate.The 4th, the merging of SFA masterplate, for example MCE has selected SFA masterplate 1, SFA masterplate 2, SFA masterplate 3 for professional 1; For business 2 has been selected SFA masterplate 1, SFA masterplate 2, SFA masterplate 5.MCE is carrying out in the SFA mapping process for these two business so, just can regard SFA masterplate 1 and SFA masterplate 2 as a new SFA masterplate.The merging of SFA masterplate makes both had the high coverage rate of little masterplate and the advantage of flexibility when using the SFA masterplate to mate SFA, has also obtained the simplicity advantage of big masterplate to resource coordination.
MCE should consider following factor when selecting the SFA masterplate for use: at first, the SFA masterplate of being selected for use must all be comprised by the conversational services district; Secondly, the SFA masterplate of being selected for use should cover the crossing zone in conversational services district and MBSFN zone as far as possible; The 3rd, the SFA masterplate that should be as far as possible during the SFA masterplate selected for use using with already-existing session is identical, thereby can distribute the PRB resource on the same subframe for a plurality of sessions.
One embodiment of the present of invention are chosen a SFA masterplate and are carried out SFA and hint obliquely at, and for the PRB resource that two SFA with same area distribute same subframe, set up MCH.Present embodiment is that example describes with two sessions.Be illustrated in figure 5 as the schematic flow sheet of one embodiment of the present of invention, this flow process comprises:
Two MBMS sessions that step 501:MCE receives the CN transmission begin request message;
Step 502:MCE sends the MBMS session to CN and begins response message;
The indicated service area of service area parameter that step 503:MCE carries during each MBMS session is begun to ask resolves into the sub-district; Select a SFA masterplate; Present embodiment is selected the SFA2 masterplate among Fig. 4, and the sub-district that this SFA masterplate and each conversational services district comprise is mated, and gets common factor.Its part of occuring simultaneously is the SFA of this session, and the non-common factor part of each session is single cell transmission zone.Be illustrated in figure 6 as the mapping process sketch map.
The order of above-mentioned steps 502 and step 503 can exchange.
Step 504:MCE sends session to the eNB of its administration and begins message.And the session issuing the eNB that carries out the SFN transmission begins to carry in the message PRB resource of setting up employed subframe of MCH and distribution.
In this step; MCE is being two identical SFA when distributing the PRB resource, and the PRB resource of at first distributing 2 work song frames for the SFA of service area 1 is when being the SFA1 distribution PRB resource of service area 2; Judge at first whether 2 work song frames have enough residue PRB resources; If have, then distribute the PRB resource of 2 work song frames for the SFA1 of service area 2, as shown in Figure 7; If do not have, then MCE can not be multiplexed into the SFA of service area 1 and the SFA of service area 2 on the sub-frame, and promptly MCE still can be respectively the PRB resource on the SFN region allocation difference subframes of two sessions.
MCE be session distribute the PRB resource order in no particular order, promptly in this step, MCE also can be earlier the SFA distribution PRB resource of service area 2.
If do not use said method, but with the method for prior art, then MCE is that above-mentioned two sessions SFA of carrying out obtaining after the SFA mapping is as shown in Figure 8, and then MCE be that the situation of the interior cell allocation PRB resource of these two SFA is as shown in Figure 9.
Can know by above contrast, can effectively utilize the PRB resource of subframe so that MCE is in a plurality of sessions during identical SFA Resources allocation through using the present invention.
An alternative embodiment of the invention is chosen a plurality of SFA masterplates and is carried out SFA and hint obliquely at, and sets up MCH for two SFA with same area distribute the PRB resource of same subframe.Present embodiment is that example describes with two sessions.Shown in figure 10 is the schematic flow sheet of an alternative embodiment of the invention, and this flow process comprises:
Step 1001-step 1002 is with step 501-step 502;
When step 1003:MCE selects SFA masterplate zone for use at the service area that is two conversation request; To the service area 1 of conversation request 1, select for use the masterplate SFA1 among Fig. 4 proper, masterplate SFA1 has covered the most of zone of service area 1 in the MBSFN zone; Through coupling; The common factor of the sub-district that SFA1 masterplate and service area 1 comprise is the SFA of conversation request 1, and single cell pattern transmission is carried out in the remainder sub-district of service area 1, and is shown in figure 11.Service area 2 to conversation request 2; If MCE only uses SFA masterplate 1 to mate; Service area 2 still has a big chunk to be covered by SFN masterplate 1 zone in the sub-district in MBSFN zone; Then MCE selects for use masterplate SFA3 and the remainder in the MBSFN zone among Fig. 4 to mate again, therefore obtains two different SFA shown in figure 11.
The order of above-mentioned steps 1002 and step 1003 can exchange.
Step 1004:MCE sends session to the eNB of its administration and begins message.And the session issuing the eNB that carries out the SFN transmission begins to carry in the message PRB resource of setting up employed subframe of MCH and distribution.
In this step, shown in figure 12, MCE is being that two identical SFA are when distributing the PRB resource; The PRB resource of at first distributing 2 work song frames for the SFA of service area 1 when the SFA1 that is service area 2 distributes the PRB resource, judges at first whether 2 work song frames have enough residue PRB resources; If have; Then distribute the PRB resource of 2 work song frames, and select 4 work song frames of a still unallocated PRB resource, the PRB resource of distributing 4 work song frames for the SFA2 of service area 2 for the SFA1 of service area 2; If do not have, then MCE can not be multiplexed into the SFA of service area 1 and the SFA1 of service area 2 on the sub-frame, and promptly MCE still can be respectively the PRB resource of SFN region allocation on different subframes of two sessions, sets up MCH.MCE be session distribute the PRB resource order in no particular order, promptly in this step, MCE also can be earlier the SFA distribution PRB resource of service area 2.
The embodiment of the invention is equally applicable to the situation of a plurality of sessions, promptly receives N (N >=2) when individual session begins to ask as MCE, and MCE can select one or more masterplates to hint obliquely at for the service area of each session carries out SFA, obtains SFA, and is SFA distribution PRB resource.When MCE is N session distribution PRB resource, judge at first whether this session has and the identical SFA of a preceding N-1 session, can be the multiple identical SFA that multiple SFA masterplate coupling obtains; If have; Whether each subframe at the PRB resource place that the above-mentioned identical SFA of N-1 session distributes before then being judged as all has enough PRB, if having, then is the PRB resource of above-mentioned each subframe of above-mentioned identical SFA distribution of this N session; For in N the session with the SFA SFA all inequality of a preceding N-1 session; MCE newly selects a new subframe, does not promptly also have the subframe of use, distributes the PRB of the subframe of this new selection for this SFA; If have at least a sub-frame not have enough PRB resources in above-mentioned each subframe, then MCE selects a new subframe, does not promptly also have the subframe of use, all distributes the PRB of the subframe of this new selection for all SFA of this N session.
When MCE manages a plurality of session with different service area scopes simultaneously; Pass through said method; After using limited SFA masterplate that the service area of session is divided into a plurality of SFA,, can practice thrift the expense of subframe for the identical SFA of session as much as possible distributes the PRB resource of same subframe; Improve the utilance of PRB resource on the subframe, avoid the waste in subframe space.And MCE can also be according to the operating position and the SFA matching result of subframe, and reasonably whether decision adopts subframe multiplexing, which SFA to carry out multiplexing etc. to.
The embodiment of the invention also provides a kind of multicast coordination entity MCE, and this entity comprises: transceiver module, memory module, Executive Module, wherein,
Transceiver module 1301 is used to receive the session that CN sends and begins request, and sends session to eNB and begin request;
Memory module 1302 is used to store the SFA masterplate;
Executive Module 1303 is used to select the SFA masterplate, is used for the sub-district that service area comprised and the SFA masterplate of each session are mated, and the part of occuring simultaneously is SFA, and non-common factor is single cell area partly, and the SFA that is used to each session distributes the PRB resource.
It more than is detailed introduction to the mapping method of a kind of single-frequency network area provided by the present invention; Used concrete example among this paper principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that on embodiment and range of application, all can change, in sum, this description should not be construed as limitation of the present invention.
Claims (6)
1. the mapping method of a single-frequency network area is characterized in that, this method comprises:
The N that comprises the service area parameter session that multicast coordination entity MCE receives core net CN transmission begins request message, the service area of said service area parameter indication session, and wherein N is an integer, and N >=2;
MCE selects single-frequency network area SFA masterplate, and the sub-district that said service area parameter is indicated matees with said SFA masterplate, and occuring simultaneously partly is SFA;
MCE is that said SFA distributes physical resource;
Said MCE is that said SFA distributes physical resource to be specially: said MCE confirms that N session has and the identical SFA of a preceding N-1 session; Whether each subframe at the Physical Resource Block PRB of the said identical SFA of N-1 session place all has enough residue PRB before judging; If have; Each the said identical SFA that then is said N session distributes the PRB of said each subframe; Simultaneously said MCE selects an also untapped subframe, is to distribute the PRB of said also untapped subframe with the SFA of preceding N-1 session SFA all inequality in N the session; If at least one does not have enough residue PRB in said each subframe, then said MCE selects an also untapped subframe, distributes the PRB resource of this subframe for the SFA of said N session;
Said SFA masterplate is a part of sub-district in the multimedia broadcasting multimedia service SFN MBSFN zone of said MCE control.
2. the method for claim 1 is characterized in that, said MCE selects one or more SFA masterplates.
3. the method for claim 1 is characterized in that, said SFA template stores is on said MCE.
4. the method for claim 1 is characterized in that, the non-common factor part that said MCE carries out obtaining after the said coupling is single cell transmission zone.
5. a multicast coordination entity is characterized in that, this multicast coordination entity comprises: transceiver module, memory module and Executive Module, wherein
The session that said transceiver module is used to receive N the session that CN sends begins to ask, wherein N >=2;
Said memory module is used to store the SFA masterplate, and said SFA masterplate is a part of sub-district in the multimedia broadcasting multimedia service SFN MBSFN zone of said multicast coordination entity MCE control;
Said Executive Module is used to select the SFA masterplate, is used for sub-district and said SFA masterplate that the service area with a said N session comprises and matees, and the part of occuring simultaneously be SFA, is used to the SFA distribution PRB resource of a said N session;
Said multicast coordination entity MCE is that the SFA of a said N session distributes the PRB resource to be specially: said MCE confirms that N session has and the identical SFA of a preceding N-1 session; Whether each subframe at the Physical Resource Block PRB of the said identical SFA of N-1 session place all has enough residue PRB before judging; If have; Each the said identical SFA that then is said N session distributes the PRB of said each subframe; Simultaneously said MCE selects an also untapped subframe, is to distribute the PRB of said also untapped subframe with the SFA of preceding N-1 session SFA all inequality in N the session; If at least one does not have enough residue PRB in said each subframe, then said MCE selects an also untapped subframe, distributes the PRB resource of this subframe for the SFA of said N session.
6. multicast coordination entity as claimed in claim 5 is characterized in that, said Executive Module is selected one or more SFA masterplates.
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| CN101998250B (en) * | 2009-08-25 | 2016-09-21 | 电信科学技术研究院 | A kind of multicast control channel message synchronization sending method, device and system |
| CN102118694B (en) | 2010-01-11 | 2014-05-28 | 电信科学技术研究院 | Method and system for determining mapping relationship between multicast single-frequency network area and service area |
| CN102215574A (en) * | 2010-04-07 | 2011-10-12 | 鼎桥通信技术有限公司 | Configuration and application method of semicontinuous scheduling resource |
| CN102143430B (en) * | 2011-02-15 | 2016-05-25 | 电信科学技术研究院 | A kind of method and apparatus that configures MBMS session location information |
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