CN104426642B - The recognition methods of multicast single frequency network subframe, device and network-side - Google Patents
The recognition methods of multicast single frequency network subframe, device and network-side Download PDFInfo
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- CN104426642B CN104426642B CN201310394409.1A CN201310394409A CN104426642B CN 104426642 B CN104426642 B CN 104426642B CN 201310394409 A CN201310394409 A CN 201310394409A CN 104426642 B CN104426642 B CN 104426642B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/261—Details of reference signals
Abstract
The present invention relates to fields of communication technology, the in particular to recognition methods of multicast single frequency network subframe, device and network-side to realize MBSFN sub-frame identification by adding limited information in SIB13 and/or SIB2；And/or MBSFN sub-frame identification is realized by increasing channel frequency response correlation or intensity confirmation in terminal using MBSFN sub-frame and the reference signal design of conventional subframe rule；It is identified by the MBSFN sub-frame of multiplicity, increases more abundant flexibility and economy in face of MBMS business for user.
Description
Technical field
The present invention relates to fields of communication technology, in particular to multicast single frequency network (Multicast Broadcast
Single Frequency Network, abbreviation MBSFN) subframe recognition methods, device and network-side.
Background technique
With the fast development of mobile interchange, user answers the broadcast group broadcast class including mobile TV, video conference
It is significantly improved with demand, expedites the emergence of out new business growth point.This kind of multiple users of broadcast group broadcast class business need can connect simultaneously
Identical information is received, has the characteristics that data volume is big, the duration is long, delay sensitive.For this purpose, third generation partnership (3rd
Generation Partnership Project, abbreviation 3GPP) introduce broadcasting multicast service (Multimedia
Broadcast Multicast Service, abbreviation MBMS) to cope with related needs.
It is provided according to 3GPP standard TS36.331, MBMS business process is as follows:
Firstly, network-side uniquely characterizes one section by multimedia broadcast-multicast service single-frequency network area (MBSFN Area)
MBMS business, and logic channel-multicast control channel (Multicast Control is defined for each MBSFN Area
CHannel, abbreviation MCCH) for carrying service configuration information, including Logical Traffic Channels (Multicast Traffic
CHannel, abbreviation MTCH) position and configuration information, physics multicast channel (Physical Multicast CHannel, letter
Claim PMCH) configuration information etc.；And the essential information for how obtaining MCCH then passes through System information block 13(SIB13) it is broadcasted,
Including MBSFN Area information, MCCH subframe position, MBSFN sub-frame position, MCCH Notification of Changes indicating positions etc.；
Secondly, can know the position MCCH by SIB13 after terminal completion cell is resident, then opened by MCCH instruction
Beginning persistently receives MTCH；
Again, when MBMS business changes, the Notification of Changes position that network-side is arranged in SIB13 passes through under physics
Row control channel (Physical Downlink Control Channel, abbreviation PDCCH) indicates that change occurs (together to terminal
When can also pass through broadcast message change synchronized update SIB13)；
Finally, terminal obtains the change of MCCH information persistently receives MTCH again.
From the foregoing, it will be observed that the terminal for having MBMS business ability will successfully complete the reception of broadcast group broadcast MBMS business, need
Successively experience broadcasts the message, could smoothly start the reception of MTCH after the successful reception of MCCH, and needs constantly to supervise during this
PDCCH is listened to grasp the change situation of MCCH in time.In Current standards the position of MBSFN be carried by MCCH (though in SIB2
Also have carrying but belong to corpus information, maximum possible is only provided, the practical PMCH that whether configures does not provide instruction information), regardless of
Whether UE is interesting to MBSFN business, it is necessary to MCCH is persistently monitored, however, when user no longer it is expected to receive MBMS business,
Or user no longer it is expected that still expectation normally receives the object that may be transmitted on MBSFNsubframe while reception MBMS business
It is expected to utilize when managing DSCH Downlink Shared Channel (PDSCH) or while user no longer it is expected to receive MBMS business and does not transmit PMCH
When carrying out aid in treatment (such as noise power estimation) with the MBSFN sub-frame of PDSCH, existing process flow will bring terminal side
Great unnecessary reception expense, to seriously affect terminal standby time and user's impression.
It is provided according to 3GPP standard TS36.211 it is found that the MBSFN sub-frame specified in MBMS business process, is divided into non-
The region MBSFN and the region MBSFN, the non-region MBSFN occupy 1~2 orthogonal frequency division multiplex OFDM symbol according to subframe definition difference
Number (when occupying 1 OFDM symbol, refers to OFDM0, when occupying 2 OFDM symbols, refer to OFDM0 and 1), be used for transmission DCI
(Downlink controlinformation, Downlink Control Information) indicates information, carries cell and specifies reference signal Cell-
specific；The region MBSFN is transmitted for PMCH, is carried MBSFN reference signal and is not included Cell-specific with reference to letter
Number.PMCH only uses single antenna multiple-input and multiple-output (Multiple-Input Multiple-Out-put, abbreviation MIMO) mode
It is configured with extended cyclic prefix, can support to receive in the mating MBSFN reference signal of particular resource unit while PMCH transmission
No longer there is cell and specify (Cell-specific) reference signal in equilibrium in the region MBSFN there are PMCH.In other words
Cell-specific reference signal is not present in the region MBSFN of MBSFN sub-frame, Cell-specific reference signal is present in
The non-region MBSFN of MBSFN sub-frame, conventional downlink subframe there will necessarily be Cell-specific reference signal, and distribution is to know
's.
Due to the above-mentioned particularity of MBSFN sub-frame, do not support when undesirable reception MBMS business or to receive MBMS business
After the terminal of (MBMS is optional in 3GPP feature definitions) is resident in MBSFN cell, it is necessary to accurately identify MBSFN
Otherwise MBSFN sub-frame is considered as conventional downlink subframe and carries out the behaviors such as channel estimation, measurement, timing/Frequency Synchronization by frame, but by
It is comprehensively abnormal in the missing of Cell-specific reference signal.
Based on MBMS process analysis above-mentioned, for the undesirable end for receiving MBMS business or not supporting reception MBMS business
For end, in the prior art identify MBSFN sub-frame process it is excessively complicated, it is not necessary to expense it is excessive with cost, be unfavorable for end
Hold standby and Save power consumption.
Summary of the invention
In order to solve the above problem, the present invention provides the recognition methods of multicast single frequency network subframe, and terminal is in identification MBSFN
After subframe, MBMS business is received in MBSFN sub-frame according to user demand selection or does not receive MBMS business；
The identification MBSFN sub-frame includes:
When cell is resident, SIB2 and/or SIB13 is read, obtains MBSFN sub-frame information；The SIB2 and/or SIB13
Accurate MBSFN sub-frame information is provided by network-side configuration；
And/or
After cell is resident, Cell-specific reference signal is extracted in the specific OFDM symbol of specific downlink subframe；
Channel frequency response estimation is carried out as unit of OFDM symbol for the Cell-specific reference signal of extraction；Based on frequency domain channel
Estimated result calculates the channel frequency response characteristic of OFDM symbol 0 and other OFDM symbols, judges whether the channel frequency response characteristic is small
In predetermined threshold value Th, if so, current subframe is MBSFN sub-frame；Otherwise current subframe is non-MBSFN sub-frame.
In order to solve the above problem, the present invention also provides multicast single frequency network subframe identification devices, comprising:
SIB read module configures offer standard by network-side for reading SIB13 or/SIB2, the SIB2 and/or SIB13
True MBSFN sub-frame information；
MBSFN sub-frame identification module, is used for:
MBSFN sub-frame information is identified using the SIB13 or/SIB2 of reading,
And/or
Cell-specific reference signal is extracted in the specific OFDM symbol of specific downlink subframe；For extraction
Cell-specific reference signal carries out channel frequency response estimation as unit of OFDM symbol；Based on channel estimation in frequency domain result
The channel frequency response characteristic for calculating OFDM symbol 0 and other OFDM symbols, judges whether the channel frequency response characteristic is less than pre-determined threshold
Value Th, if so, current subframe is MBSFN sub-frame；Otherwise current subframe is non-MBSFN sub-frame；
MBMS business receiving module, for receiving MBMS business in MBSFN sub-frame according to user demand selection or not receiving
MBMS business.
In order to solve the above problem, the present invention also provides multicast single frequency network end, the network-side:
It configures System information block SIB2 and/or System information block SIB13 and carries accurate MBSFN sub-frame information；
And/or
MBSFN sub-frame is configured, the non-region MBSFN and the region MBSFN are divided into, the non-region MBSFN is fixed according to subframe
Adopted difference occupies 1~2 orthogonal frequency division multiplex OFDM symbol instruction information, carries cell and specifies reference signal Cell-
specific；The region MBSFN is transmitted for PMCH, is carried MBSFN reference signal and is not included Cell-specific with reference to letter
Number.
The present invention realizes MBSFN sub-frame identification by adding limited information in SIB13 and/or SIB2；And/or it utilizes
MBSFN sub-frame and the reference signal design of conventional subframe rule, by increasing channel frequency response correlation or intensity confirmation in terminal,
Realize MBSFN sub-frame identification；It is identified by the MBSFN sub-frame of multiplicity, increases more abundant spirit in face of MBMS business for user
Activity and economy.
Detailed description of the invention
Fig. 1 is multicast single frequency network subframe recognition methods preferred embodiment flow diagram of the present invention；
Fig. 2 is multicast single frequency network subframe identification device preferred embodiment structural schematic diagram of the present invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is described in further details.
Multicast single frequency network subframe recognition methods of the present invention, terminal recognition MBSFN sub-frame are selected according to user demand
MBMS business is received in MBSFN sub-frame or does not receive MBMS business.
Preferably, the terminal recognition MBSFN sub-frame be included in cell it is resident during, pass through and read the identification of SIB information
MBSFN sub-frame, including a variety of implementations, are now described below respectively:
Embodiment 1
Optionally, terminal knows MCCH according to SIB13 during cell is resident, obtains MBSFN sub-frame position by MCCH
It sets；
Network-side uniquely characterizes MBMS business by MBSFN Area, carries service configuration information by MCCH；Pass through
SIB13 indicates MBSFN Area, MCCH relevant information；
When having carried MBSFN sub-frame information in SIB13, the information unit " MBSFN- that is directly based upon in SIB13
SubframeConfig " obtains MBSFN sub-frame position；
For example, being expressed as follows with the code of ASN.1 abstract syntax notation one:
In the present embodiment, sub-frame information configuration unit " MBSFN-SubframeConfig " is increased newly in SIB13 and is carried
MBSFN sub-frame information.It is not include this IE(Information Element in SIB13 in existing 3GPP TS36.331, letter
Interest statement member), this IE, by adding limited information in network-side SIB13, realizes MBSFN of low-cost in MCCH
Frame identification；Due to having MBSFN sub-frame information in broadcast message, do not receive or the terminal of MBSFN business do not supported to obtain phase
The cost for closing information will be significantly reduced with cost, and the code representation of ASN.1 abstract syntax notation one of the present invention belongs to ability
Domain well-known technique, is no longer described in detail.
According to 3GPP TS36.331, " MBSFN-SubframeConfig " includes following information:
Respectively correspond radio frames assignment period jointly defined with radio frames allocation offsets amount it is wireless where MBSFN sub-frame
Frame number；It is MBSFN sub-frame that Subframe Allocation Pattern, which specifically defines which subframe in radio frames,；Detail can refer to 3GPP
TS36.331。
The above radio frames assignment period, offset, sub-frame allocation information integrate, it can be achieved that clearly MBSFN sub-frame
Position instruction.
After completing the identification of multicast single frequency network subframe, terminal is connect according to user demand, selection in MBSFN sub-frame
It receives MBMS business or skips MBMS business reception.
Embodiment 2
Optionally, for terminal during cell is resident, network-side uniquely characterizes MBMS business by MBSFN Area, passes through
MCCH carries service configuration information；Accurate MBSFN sub-frame information is indicated by SIB2；
Essential carrying MBSFN sub-frame information in SIB2；
For example, being expressed as follows with the code of ASN.1 abstract syntax notation one:
It originally was that optional IE " mbsfn-SubframeConfigList " is configured to remove " OPTIONAL " and refer in order to essential
Show, it is ensured that relevant information will appear in SIB2 always.
And " mbsfn-SubframeConfigList " due to containing " MBSFN-SubframeConfig " information,
Implement as 1 with preferable, realizes clearly MBSFN sub-frame position instruction.
Subsequent step is the same as embodiment 1.
Embodiment 3
Optionally, for terminal during cell is resident, network-side uniquely characterizes MBMS business by MBSFN Area, passes through
MCCH carries service configuration information；Accurate MBSFN sub-frame information is provided by SIB13 and SIB2；
Optionally, MBSFN sub-frame information is carried in SIB13 simultaneously；
Essential carrying MBSFN sub-frame information in SIB2；
The present embodiment carries MBSFN sub-frame information in SIB13 and SIB2 simultaneously, and subsequent processing steps are the same as embodiment 1；
From above embodiments as it can be seen that MBSFN sub-frame information can be carried individually in SIB13 or SIB2, identification MBSFN
Frame can also carry MBSFN sub-frame in SIB13 and SIB2, identify MBSFN sub-frame information.
Preferably, the terminal recognition MBSFN sub-frame including the use of MBSFN sub-frame and conventional subframe reference signal design
Rule identifies MBSFN sub-frame by increasing the confirmation of channel frequency response characteristic in terminal.MCCH need not be tracked in a conventional way, only
Predetermined operation need to be done to channel frequency response characteristic, can quickly identify MBSFN sub-frame, and corresponding operating can also be existing with other originals
Survey calculation multiplexing, cost is very low, the excessively complicated low-cost of the process for solving prior art identification MBSFN sub-frame
Solution.
It specifically includes:
Embodiment 4
Step 301 extracts Cell-specific reference signal in the specific OFDM symbol of specific downlink subframe；
In this step, the specific sub-frame is subframe 1,2,3,6,7,8 in frequency division multiplexing (FDD) cell；It is multiple in the time-division
It is subframe 3,4,7,8,9 in (TDD) cell；
The Cell-specific reference signal of the extraction, it is necessary to comprising OFDM symbol 0 and at least one except OFDM symbol
The OFDM symbol of carrying Cell-specific reference signal other than number 0；
Optionally, conventional cyclic prefix scene, extract OFDM symbol 0 and OFDM symbol 4 and/or OFDM symbol 7 and/or
OFDM symbol 11；
Optionally, extended cyclic prefix scene, extract OFDM symbol 0 and OFDM symbol 3 and/or OFDM symbol 6 and/or
OFDM symbol 9；
Step 302 is carried out channel frequency response as unit of OFDM symbol and estimated for the Cell-specific reference signal of extraction
Meter；
Step 303, based on channel estimation in frequency domain result calculate OFDM symbol 0 it is related to other OFDM symbol channel frequency responses
Property, judge whether the correlation is less than predetermined threshold value Th, if so, current subframe is MBSFN sub-frame；Otherwise current subframe
For non-MBSFN sub-frame；
In this step, optionally, the calculation of the channel frequency response correlation are as follows:
Or
Wherein, CFRi,jFor i-th of subcarrier, the frequency response of j-th OFDM symbol；
Optionally, predetermined threshold value Th value range (0.6~1) × N × M, N are that single OFDM symbol participates in correlation
Property operation sub-carrier number, M be except OFDM symbol 0 in addition to participation operation OFDM symbol number；
Optionally, predetermined threshold value Th value range (- 0.5~0.5) × Th0, Th0 are the conventional son of historical record
The correlation of frame (i.e. non-MBSFN sub-frame).
Provide that MBSFN sub-frame is divided into the non-region MBSFN and the region MBSFN, non-according to 3GPP standard TS36.211
The region MBSFN occupies 1~2 OFDM symbol according to subframe definition difference, is used for transmission DCI instruction information, carries Cell-
Specific reference signal；The region MBSFN is transmitted for PMCH, is carried MBSFN reference signal and is not included Cell-specific
Reference signal；
The present invention unknown current subframe whether MBSFN sub-frame under the premise of, it is assumed that the routinely rule extraction of subframe
Cell-specific reference signal obtains the carrying Cell-specific reference signal including OFDM symbol 0 respectively
OFDM symbol channel frequency response；Consider channel time selectivity, the channel frequency response correlation in subframe is apparent；Due to MBSFN
In region and do not include Cell-specific reference signal, accurate channel frequency response can not be obtained according to above-mentioned calculation method, because
Obtained from correlation will be in the MBSFN subframe it is extremely low, this just for MBSFN sub-frame low-cost judgement provide foundation.
Further, the low-cost characteristic of MBSFN sub-frame low-cost of the invention judgement is also embodied in: what the present invention used
Correlation or power level decision method may be equally applicable for including the operation such as Doppler's estimation, measurement, Timing Synchronization, can
See that respective relevancy judgement can have operation multiplexing complexity with other, therefore has no significant workload and increase.
Embodiment 5
Step 501 extracts Cell-specific reference signal in the specific OFDM symbol of specific downlink subframe；
In this step, the specific sub-frame is subframe 1,2,3,6,7,8 in frequency division multiplexing (FDD) cell；It is multiple in the time-division
It is subframe 3,4,7,8,9 in (TDD) cell；
The Cell-specific reference signal of the extraction, it is necessary to comprising OFDM symbol 0 and at least one except OFDM symbol
The OFDM symbol of carrying Cell-specific reference signal other than number 0；
Optionally, conventional cyclic prefix scene, extract OFDM symbol 0 and OFDM symbol 4 and/or OFDM symbol 7 and/or
OFDM symbol 11；
Optionally, extended cyclic prefix scene, extract OFDM symbol 0 and OFDM symbol 3 and/or OFDM symbol 6 and/or
OFDM symbol 9；
Step 502 is carried out channel frequency response as unit of OFDM symbol and estimated for the Cell-specific reference signal of extraction
Meter；
Step 503, the frequency response intensity that OFDM symbol 0 and other OFDM symbols are calculated based on channel estimation in frequency domain result, are sentenced
Whether the symbol frequency response intensity of breaking is greater than predetermined threshold value Th, if so, current subframe is MBSFN sub-frame；Otherwise current son
Frame is non-MBSFN sub-frame；
In this step, optionally, the calculation of the frequency response intensity are as follows:
Or
Wherein, PowerjFor the frequency response intensity of j-th of OFDM symbol, CFRi,jFor i-th of subcarrier, j-th of OFDM symbol
Frequency response；
Optionally, the predetermined threshold value Th value range 50%~100%；
Optionally, predetermined threshold value Th value range (- 0.5~0.5)/Th0, Th0 are the conventional son of historical record
The correspondence OFDM symbol 0 of frame (i.e. non-MBSFN sub-frame) and the frequency response intensity rate of other OFDM symbols.
It can be carried out from the visible terminal recognition MBSFN sub-frame of above embodiments by identification SIB13 and/or SIB2, it can also
It is true by increasing channel frequency response characteristic in terminal with regular by the reference signal design using MBSFN sub-frame and conventional subframe
Recognize, identifies MBSFN sub-frame.
It can be combined with SIB13 and/or SIB2 and MBSFN sub-frame and conventional subframe as a preferred implementation manner,
Reference signal design rule carries out, described in detail below.
Embodiment 6
Preferably, the terminal recognition MBSFN sub-frame, as shown in Figure 1, can also be in the following ways:
Terminal obtains MBSFN sub-frame information during cell is resident, by reading SIB13 or/SIB2, loses if obtained
It loses, then after cell is resident, using MBSFN sub-frame and the reference signal design of conventional subframe rule, channel frequency response characteristic is done
Predetermined operation identifies MBSFN sub-frame.
It is described to obtain MBSFN sub-frame information by reading SIB13 or/SIB2, using embodiment 1-3 either type, no longer
It is described in detail.
It is described regular using MBSFN sub-frame and the reference signal design of conventional subframe, predetermined behaviour is done to channel frequency response characteristic
Make, identification MBSFN sub-frame is no longer described in detail using embodiment 4-5 either type.
Multicast single frequency network subframe identification device of the present invention, as shown in Figure 2, comprising:
SIB read module M1, for reading SIB13 or/SIB2, the SIB2 and/or SIB13 are configured to by network-side
Indicate that MBSFN Area, MCCH relevant information, the MBSFN Area uniquely characterize MBMS business, the MCCH carries business and matches
Confidence breath.
MBSFN sub-frame identification module M2, is used for:
MBSFN sub-frame is identified using the SIB13 or/SIB2 of reading,
And/or
Cell-specific reference signal is extracted in the specific OFDM symbol of specific downlink subframe；For extraction
Cell-specific reference signal carries out channel frequency response estimation as unit of OFDM symbol；Based on channel estimation in frequency domain result
The channel frequency response characteristic for calculating OFDM symbol 0 and other OFDM symbols, judges whether the channel frequency response characteristic is less than pre-determined threshold
Value Th, if so, current subframe is MBSFN sub-frame；Otherwise current subframe is non-MBSFN sub-frame.
MBMS business receiving module M3, for receiving MBMS business in MBSFN sub-frame according to user demand selection or not connecing
Receive MBMS business.
It is described to identify MBSFN sub-frame information using the SIB13 read or/SIB2, using embodiment 1-3 either type, no
It is described in detail again.
It is described that Cell-specific reference signal is extracted in the specific OFDM symbol of specific downlink subframe；For extraction
Cell-specific reference signal channel frequency response estimation is carried out as unit of OFDM symbol；Based on channel estimation in frequency domain result
The channel frequency response characteristic for calculating OFDM symbol 0 and other OFDM symbols, judges whether the channel frequency response characteristic is less than pre- gating
Limit value Th, if so, current subframe is MBSFN sub-frame；Otherwise current subframe is non-MBSFN sub-frame, is appointed using embodiment 4-5
One mode, is no longer described in detail；
Particularly, terminal obtains MBSFN sub-frame information by reading SIB13 or/SIB2 during cell is resident, but
If obtaining failure, after cell is resident, using MBSFN sub-frame and the reference signal design of conventional subframe rule, to channel
Frequency Response does predetermined operation, identifies MBSFN sub-frame.
The present invention realizes that the MBSFN sub-frame of low-cost is known by the limited information added in identification SIB13 and/or SIB2
Not；And/or using MBSFN sub-frame and the reference signal design of conventional subframe rule, terminal is by increasing channel frequency response correlation
Property or intensity confirmation, realize low-cost MBSFN sub-frame identification；It is identified by the MBSFN sub-frame of above-mentioned multiplicity, is faced for user
MBMS business increases more abundant flexibility and economy.
The present invention also provides a kind of multicast single frequency network end, the network-side:
It configures SIB2 and/or SIB13 and carries accurate MBSFN sub-frame information, indicate multimedia broadcast-multicast service single-frequency
Web area MBSFN Area, Logical Traffic Channels MCCH relevant information, the MBSFNArea uniquely characterize broadcasting multicast service
MBMS, the MCCH carry service configuration information；
The concrete mode that configuration SIB2 and/or SIB13 carries MBSFN sub-frame information is shown in the description of embodiment 1-3, herein
It repeats no more.
And/or
MBSFN sub-frame is configured, the non-region MBSFN and the region MBSFN are divided into, the non-region MBSFN is fixed according to subframe
Adopted difference occupies 1~2 orthogonal frequency division multiplex OFDM symbol instruction information, carries cell and specifies reference signal Cell-
specific；The region MBSFN is transmitted for PMCH, is carried MBSFN reference signal and is not included Cell-specific with reference to letter
Number；
That is, configuring Cell-specific in the certain orthogonal frequency division multiplex OFDM symbol of specific downlink subframe with reference to letter
Number, the specific sub-frame is subframe 1,2,3,6,7,8 in frequency division multiplexing FDD cell, is subframe in time division multiplexing TDD cell
3,4,7,8,9；The specific OFDM symbol is OFDM symbol 0 and at least one carrying Cell- in addition to OFDM symbol 0
The OFDM symbol of specific reference signal；
In conventional cyclic prefix scene, the carrying Cell-specific reference signal in addition to OFDM symbol 0
OFDM symbol includes OFDM symbol 4 and/or OFDM symbol 7 and/or OFDM symbol 11；
In extended cyclic prefix scene, the carrying Cell-specific reference signal in addition to OFDM symbol 0
OFDM symbol includes OFDM symbol 3 and/or OFDM symbol 6 and/or OFDM symbol 9.
Inventive network end configures SIB2 and/or SIB13 and carries accurate MBSFN sub-frame information, by SIB2 and/or
SIB13 can recognize MBSFN sub-frame, or configure in the certain orthogonal frequency division multiplex OFDM symbol of specific downlink subframe
Cell-specific reference signal, terminal can identify MBSFN sub-frame, net by identification Cell-specific reference signal
Network end marks MBSFN sub-frame by the combination of any of the above mode or both, has more convenient for terminal recognition MBSFN sub-frame
Selectivity and flexibility.
The lifted embodiment of the present invention or embodiment have carried out further the object of the invention, technical solution and advantage
It is described in detail, it should be understood that embodiment provided above or embodiment are only the preferred embodiment of the present invention,
Be not intended to limit the invention, all within the spirits and principles of the present invention any modification made for the present invention, equivalent replacement,
Improve etc., it should all be included in the protection scope of the present invention.
Claims (11)
1. multicast single frequency network MBSFN sub-frame recognition methods, terminal is selected after identifying MBSFN sub-frame according to user demand
It selects and receives broadcasting multicast service MBMS in MBSFN sub-frame or do not receive broadcasting multicast service MBMS, it is characterised in that:
The identification MBSFN sub-frame includes:
When cell is resident, read system message block SIB2 and/or SIB13 obtain MBSFN sub-frame information；The SIB2 and/or
SIB13 is configured to provide for accurate MBSFN sub-frame information by network-side；
And/or
After cell is resident, Cell-specific is extracted in the certain orthogonal frequency division multiplex OFDM symbol of specific downlink subframe
Reference signal；Channel estimation in frequency domain is carried out as unit of OFDM symbol for the Cell-specific reference signal of extraction；It is based on
Channel estimation in frequency domain result calculates the channel frequency response characteristic of OFDM symbol 0 and other OFDM symbols, judges that the channel frequency response is special
Property whether be less than predetermined threshold value Th, if so, current subframe be MBSFN sub-frame；Otherwise current subframe is non-MBSFN sub-frame.
2. multicast single frequency network MBSFN sub-frame recognition methods according to claim 1, which is characterized in that described
OFDM symbol 0 and the channel frequency response characteristic of other OFDM symbols are OFDM symbol 0 and other OFDM symbol channel frequency response correlations:
Or
Wherein, CFRi,jFor i-th of subcarrier, the frequency response of j-th OFDM symbol；
0.6 × N of the predetermined threshold value Th value range × M~1 × N × M, N are that single OFDM symbol participates in correlation operation
Sub-carrier number, M be except OFDM symbol 0 in addition to participation operation OFDM symbol number；
Alternatively,
Predetermined threshold value Th value range -0.5 × Th0~0.5 × Th0, Th0 are the correlation of the conventional subframe of historical record
Property.
3. multicast single frequency network MBSFN sub-frame recognition methods according to claim 1, which is characterized in that described
The channel frequency response characteristic of OFDM symbol 0 and other OFDM symbols is the frequency response intensity of OFDM symbol 0 and other OFDM symbols:
Or
Wherein, PowerjFor the frequency response intensity of j-th of OFDM symbol, CFRi,jFor i-th of subcarrier, the frequency of j-th OFDM symbol
It rings；
The predetermined threshold value Th value range 50%~100%；
Or
The predetermined threshold value Th value range -0.5Th0~0.5/Th0, Th0 are the correspondence of the conventional subframe of historical record
The frequency response intensity rate of OFDM symbol 0 and other OFDM symbols.
4. multicast single frequency network MBSFN sub-frame recognition methods according to claim 1, which is characterized in that the spy
Stator frame is subframe 1,2,3,6,7,8 in frequency division multiplexing FDD cell, be subframe 3 in time division multiplexing TDD cell, 4,7,8,
9；The specific OFDM symbol be OFDM symbol 0 and at least one in addition to OFDM symbol 0 carrying Cell-specific ginseng
Examine the OFDM symbol of signal.
5. multicast single frequency network MBSFN sub-frame recognition methods according to claim 4, which is characterized in that in routine
The OFDM symbol of cyclic prefix scene, the carrying Cell-specific reference signal in addition to OFDM symbol 0 includes OFDM
Symbol 4 and/or OFDM symbol 7 and/or OFDM symbol 11；
In extended cyclic prefix scene, the OFDM symbol of the carrying Cell-specific reference signal in addition to OFDM symbol 0
It number include OFDM symbol 3 and/or OFDM symbol 6 and/or OFDM symbol 9.
6. multicast single frequency network MBSFN sub-frame identification device characterized by comprising
SIB read module is used for read system message block SIB13 and/or SIB2, and the SIB2 and/or SIB13 are matched by network-side
It sets for providing accurate MBSFN sub-frame information；
MBSFN sub-frame identification module, is used for:
MBSFN sub-frame information is identified using the SIB13 or/SIB2 of reading,
And/or
Cell-specific reference signal is extracted in the certain orthogonal frequency division multiplex OFDM symbol of specific downlink subframe；For
The Cell-specific reference signal of extraction carries out channel estimation in frequency domain as unit of OFDM symbol；Based on channel estimation in frequency domain
As a result the channel frequency response characteristic for calculating OFDM symbol 0 and other OFDM symbols, it is pre- to judge whether the channel frequency response characteristic is less than
Gating limit value Th, if so, current subframe is MBSFN sub-frame；Otherwise current subframe is non-MBSFN sub-frame；
MBMS business receiving module, for receiving broadcasting multicast service MBMS or not in MBSFN sub-frame according to user demand selection
Receive broadcasting multicast service MBMS.
7. multicast single frequency network MBSFN sub-frame identification device according to claim 6, which is characterized in that described
OFDM symbol 0 and the channel frequency response characteristic of other OFDM symbols are OFDM symbol 0 and other OFDM symbol channel frequency response correlations:
Or
Wherein, CFRi,jFor i-th of subcarrier, the frequency response of j-th OFDM symbol；
0.6 × N of the predetermined threshold value Th value range × M~1 × N × M, N are that single OFDM symbol participates in correlation operation
Sub-carrier number, M be except OFDM symbol 0 in addition to participation operation OFDM symbol number；Alternatively,
Predetermined threshold value Th value range -0.5 × Th0~0.5 × Th0, Th0 are the correlation of the conventional subframe of historical record
Property.
8. multicast single frequency network MBSFN sub-frame identification device according to claim 6, which is characterized in that according to power
Benefit requires the 1 multicast single frequency network subframe recognition methods, which is characterized in that OFDM symbol 0 and other OFDM are accorded with
Number channel frequency response characteristic be OFDM symbol 0 and other OFDM symbols frequency response intensity:
Or
Wherein, PowerjFor the frequency response intensity of j-th of OFDM symbol, CFRi,jFor i-th of subcarrier, the frequency of j-th OFDM symbol
It rings；
The predetermined threshold value Th value range 50%~100%；
Or
The predetermined threshold value Th value range -0.5/Th0~0.5/Th0, Th0 are the correspondence of the conventional subframe of historical record
The frequency response intensity rate of OFDM symbol 0 and other OFDM symbols.
9. multicast single frequency network MBSFN sub-frame identification device according to claim 6, which is characterized in that the spy
Stator frame is subframe 1,2,3,6,7,8 in frequency division multiplexing FDD cell, be subframe 3 in time division multiplexing TDD cell, 4,7,8,
9；The specific OFDM symbol be OFDM symbol 0 and at least one in addition to OFDM symbol 0 carrying Cell-specific ginseng
Examine the OFDM symbol of signal.
10. multicast single frequency network MBSFN sub-frame identification device according to claim 9, which is characterized in that in routine
The OFDM symbol of cyclic prefix scene, the carrying Cell-specific reference signal in addition to OFDM symbol 0 includes OFDM
Symbol 4 and/or OFDM symbol 7 and/or OFDM symbol 11；
In extended cyclic prefix scene, the OFDM symbol of the carrying Cell-specific reference signal in addition to OFDM symbol 0
It number include OFDM symbol 3 and/or OFDM symbol 6 and/or OFDM symbol 9.
11. multicast single frequency network end, which is characterized in that the network-side: configuration System information block SIB2 and/or system disappear
It ceases block SIB13 and carries accurate MBSFN sub-frame information；
And/or
MBSFN sub-frame is configured, is divided into the non-region MBSFN and the region MBSFN, the non-region MBSFN foundation subframe definition is not
With 1~2 orthogonal frequency division multiplex OFDM symbol instruction information is occupied, carries cell and specify reference signal Cell-specific；
The region MBSFN is transmitted for PMCH, is carried MBSFN reference signal and is not included Cell-specific reference signal.
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| CN101505451A (en) * | 2008-02-04 | 2009-08-12 | 华为技术有限公司 | Capability information obtaining/sending method, communication system and related equipment |
| CN102158809A (en) * | 2010-02-12 | 2011-08-17 | 中兴通讯股份有限公司 | Multimedia broadcast multicast service (MBMS) continuity judging method and user equipment |
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| CN101370239A (en) * | 2007-08-15 | 2009-02-18 | 上海贝尔阿尔卡特股份有限公司 | Handover method and customer equipment |
| CN101505451A (en) * | 2008-02-04 | 2009-08-12 | 华为技术有限公司 | Capability information obtaining/sending method, communication system and related equipment |
| CN102158809A (en) * | 2010-02-12 | 2011-08-17 | 中兴通讯股份有限公司 | Multimedia broadcast multicast service (MBMS) continuity judging method and user equipment |
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