CN104426642A - Method and device for identifying multicast broadcast single frequency network sub frame and network terminal - Google Patents

Abstract

The invention relates to the technical field of communication, in particular to a method and a device for identifying a multicast broadcast single frequency network (MBSFN) sub frame and a network terminal. An MBSFN sub frame is identified by adding limited information in an SIB13 and/or SIB2; the MBSFN sub frame is identified by using reference signal design rule of the MBSFN sub frame and a conventional sub frame and adding channel frequency response correlation or intensity confirmation; richer flexibility and economy are increased for a user-oriented MBMS (multicast broadcast service) business through various MBSFN sub frame identification.

Description

The recognition methods of multicast single frequency network subframe, device and network terminal

Technical field

The present invention relates to communication technical field, particularly multicast single frequency network (Multicast BroadcastSingle Frequency Network is called for short MBSFN) subframe recognition methods, device and network terminal.

Background technology

Along with the fast development of mobile interchange, user to comprising mobile TV, the broadcast group broadcast class application demand of video conference significantly improves, and expedites the emergence of the business growth point made new advances.The multiple user of this kind of broadcast group broadcast class business need can receive identical information simultaneously, has the features such as data volume is large, duration length, delay sensitive.For this reason, third generation partnership (3rd Generation Partnership Project is called for short 3GPP) introduces broadcasting multicast service (Multimedia Broadcast Multicast Service is called for short MBMS) to tackle related needs.

According to 3GPP standard TS36.331 regulation, MBMS flow process is as follows:

First, network terminal uniquely characterizes one section of MBMS by multimedia broadcast-multicast service single-frequency network area (MBSFN Area), and define a logic channel-multicast control channel (Multicast Control CHannel for each MBSFN Area, be called for short MCCH) for carrying service configuration information, comprise Logical Traffic Channels (Multicast Traffic CHannel, be called for short MTCH) position and configuration information, physics multicast channel (Physical Multicast CHannel, abbreviation PMCH) configuration information etc.; How to obtain the essential information of MCCH then by System information block 13(SIB13) broadcast, comprise MBSFN Area information, MCCH subframe position, MBSFN sub-frame position, MCCH Notification of Changes indicating positions etc.;

Secondly, terminal complete community resident after, namely know MCCH position by SIB13, then start continuous reception MTCH by MCCH instruction;

Again, when MBMS occurs to change, the Notification of Changes position that network terminal is arranged in SIB13 changes generation (simultaneously also changing synchronized update SIB13 by broadcast message) by Physical Downlink Control Channel (Physical Downlink Control Channel is called for short PDCCH) to terminal instruction;

Finally, terminal obtains MCCH information-change continuous reception MTCH again.

As from the foregoing, the terminal possessing MBMS ability will be successfully completed the reception of broadcast group broadcast MBMS, the reception of MTCH could be started after needing successively to experience the successful reception of broadcast, MCCH smoothly, and need in this process constantly to monitor PDCCH to grasp the change situation of MCCH in time.In Current standards, the position of MBSFN is carried (though also carry in SIB2 but belong to corpus information by MCCH, only provide maximum possible, whether reality configures PMCH and does not provide indication information), no matter whether UE is interested in MBSFN business, all necessary continuous surveillance MCCH, but, when user no longer expects to receive MBMS, or when user still expects normally to receive Physical Downlink Shared Channel (PDSCH) that MBSFNsubframe may transmit while no longer expecting to receive MBMS, or when user expects to utilize the MBSFN sub-frame of non-transmitting PMCH and PDSCH to carry out aid in treatment (as noise power estimation) while no longer expecting to receive MBMS, existing handling process will bring reception expense unnecessary greatly to end side, thus have a strong impact on terminal standby time and user experiences.

Known according to 3GPP standard TS36.211 regulation, the MBSFN sub-frame of specifying in MBMS flow process, be divided into non-MBSFN region and MBSFN region, non-MBSFN region occupies 1 ~ 2 orthogonal frequency division multiplex OFDM symbol (when occupying 1 OFDM symbol according to subframe definition difference, refer to OFDM0, when occupying 2 OFDM symbol, refer to OFDM0 and 1), for transmitting DCI(Downlink controlinformation, Downlink Control Information) indication information, carries community and specifies reference signal Cell-specific; MBSFN region is used for PMCH transmission, carries MBSFN reference signal and does not comprise Cell-specific reference signal.PMCH only uses single antenna multiple-input and multiple-output (Multiple-Input Multiple-Out-put, being called for short MIMO) pattern and extended cyclic prefix configure, can receive balanced while PMCH transmission in the support of particular resource unit supporting MBSFN reference signal, in the MBSFN region that there is PMCH, no longer there is community and specify (Cell-specific) reference signal.Cell-specific reference signal is there is not in the MBSFN region of in other words MBSFN sub-frame, Cell-specific reference signal is present in the non-MBSFN region of MBSFN sub-frame, must be there is Cell-specific reference signal in conventional descending sub frame, its distribution knows.

Due to the above-mentioned particularity of MBSFN sub-frame, after undesirably receiving MBMS or not supporting that the terminal of reception MBMS (MBMS is optional in 3GPP feature definitions) is resident in MBSFN community, accurately must recognize MBSFN sub-frame, otherwise, MBSFN sub-frame is considered as conventional descending sub frame and carries out the behaviors such as channel estimating, measurement, regularly/Frequency Synchronization, but comprehensively abnormal due to the disappearance of Cell-specific reference signal.

Based on aforesaid MBMS process analysis, for undesirably receive MBMS or do not support receive MBMS terminal for, identify in prior art that the flow process of MBSFN sub-frame is too complicated, unnecessary expense and cost excessive, be unfavorable for that terminal standby and power consumption are saved.

Summary of the invention

For overcoming the above problems, the invention provides the recognition methods of multicast single frequency network subframe, terminal, after identification MBSFN sub-frame, is selected to receive MBMS in MBSFN sub-frame or do not receive MBMS according to user's request;

Described identification MBSFN sub-frame comprises:

When community is resident, read SIB2 and/or SIB13, obtain MBSFN sub-frame information; Described SIB2 and/or SIB13 is configured by network terminal and provides MBSFN sub-frame information accurately;

And/or

After community is resident, in the specific OFDM symbol of specific descending sub frame, extract Cell-specific reference signal; In units of OFDM symbol, channel frequency response estimation is carried out for the Cell-specific reference signal extracted; Calculate the channel frequency response characteristic of OFDM symbol 0 and other OFDM symbol based on channel estimation in frequency domain result, judge whether described channel frequency response characteristic is less than predetermined threshold value Th, if so, then present sub-frame is MBSFN sub-frame; Otherwise present sub-frame is non-MBSFN sub-frame.

For overcoming the above problems, the present invention also provides multicast single frequency network subframe recognition device, comprising:

SIB read module, for reading SIB13 or/SIB2, described SIB2 and/or SIB13 is configured by network terminal and provides MBSFN sub-frame information accurately;

MBSFN sub-frame identification module, for:

Utilize the SIB13 or/SIB2 identification MBSFN sub-frame information that read,

And/or

Cell-specific reference signal is extracted in the specific OFDM symbol of specific descending sub frame; In units of OFDM symbol, channel frequency response estimation is carried out for the Cell-specific reference signal extracted; Calculate the channel frequency response characteristic of OFDM symbol 0 and other OFDM symbol based on channel estimation in frequency domain result, judge whether described channel frequency response characteristic is less than predetermined threshold value Th, if so, then present sub-frame is MBSFN sub-frame; Otherwise present sub-frame is non-MBSFN sub-frame;

MBMS receiver module, receives MBMS in MBSFN sub-frame for selecting according to user's request or does not receive MBMS.

For overcoming the above problems, the present invention also provides multicast single frequency network end, described network terminal:

Configuration-system message blocks SIB2 and/or System information block SIB13 carries MBSFN sub-frame information accurately;

And/or

Configuration MBSFN sub-frame, is divided into non-MBSFN region and MBSFN region, and non-MBSFN region occupies 1 ~ 2 orthogonal frequency division multiplex OFDM symbol indication information according to subframe definition difference, carries community and specifies reference signal Cell-specific; MBSFN region is used for PMCH transmission, carries MBSFN reference signal and does not comprise Cell-specific reference signal.

The present invention, by being added with limit information in SIB13 and/or SIB2, realizes MBSFN sub-frame identification; And/or utilize the reference signal design rule of MBSFN sub-frame and conventional subframe, by increasing channel frequency response correlation or intensity confirmation in terminal, realize MBSFN sub-frame identification; By various MBSFN sub-frame identification, for user is in the face of the MBMS increase more flexibility of horn of plenty and economy.

Accompanying drawing explanation

Fig. 1 is multicast single frequency network subframe recognition methods preferred embodiment schematic flow sheet of the present invention;

Fig. 2 is multicast single frequency network subframe recognition device preferred embodiment structural representation of the present invention.

Embodiment

In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is described in further details.

Multicast single frequency network subframe of the present invention recognition methods, terminal recognition MBSFN sub-frame, selects to receive MBMS in MBSFN sub-frame or do not receive MBMS according to user's request.

Preferably, described terminal recognition MBSFN sub-frame is included in the resident process in community, by reading SIB information identification MBSFN sub-frame, comprising multiple implementation, being now described below respectively:

Embodiment 1

Optionally, terminal, in the resident process in community, knows MCCH according to SIB13, obtains MBSFN sub-frame position by MCCH;

Network terminal uniquely characterizes MBMS by MBSFN Area, carries service configuration information by MCCH; MBSFN Area, MCCH relevant information is indicated by SIB13;

When having carried MBSFN sub-frame information in SIB13, directly obtain MBSFN sub-frame position based on the information unit " MBSFN-SubframeConfig " in SIB13;

Such as, as follows by the coded representation of ASN.1 abstract syntax notation one:

In the present embodiment, in SIB13, newly-increased sub-frame information dispensing unit " MBSFN-SubframeConfig " carries MBSFN sub-frame information.Do not comprise this IE(Information Element, information unit in SIB13 in existing 3GPP TS36.331), this IE, in MCCH, by being added with limit information in network terminal SIB13, realizes the MBSFN sub-frame identification of low-cost; Due to MBSFN sub-frame information existing in broadcast message, do not receive or do not support that the cost of the terminal of MBSFN business acquisition relevant information and cost will significantly reduce, the coded representation mode of ASN.1 abstract syntax notation one of the present invention belongs to techniques well known, no longer describes in detail.

According to 3GPP TS36.331, " MBSFN-SubframeConfig " comprises following information:

Corresponding radio frames assignment period and radio frames allocation offsets amount jointly define the radio frame number at MBSFN sub-frame place respectively; Subframe Allocation Pattern which subframe specifically defined in radio frames is MBSFN sub-frame; Detail can with reference to 3GPP TS36.331.

Above radio frames assignment period, side-play amount, sub-frame allocation information integrate, and can realize MBSFN sub-frame position instruction clearly.

After completing the identification of multicast single frequency network subframe, terminal, according to user's request, is selected to receive MBMS in MBSFN sub-frame or skip MBMS to receive.

Embodiment 2

Optionally, terminal is in the resident process in community, and network terminal uniquely characterizes MBMS by MBSFN Area, carries service configuration information by MCCH; MBSFN sub-frame information is accurately indicated by SIB2;

Essentially in SIB2 carry MBSFN sub-frame information;

Such as, as follows by the coded representation of ASN.1 abstract syntax notation one:

Originally be that optional IE " mbsfn-SubframeConfigList " is configured in order to essential, and removed " OPTIONAL " instruction, ensure that relevant information will appear in SIB2 all the time.

And " mbsfn-SubframeConfigList " is owing to containing " MBSFN-SubframeConfig " information, therefore the same with better enforcement 1, realize MBSFN sub-frame position instruction clearly.

Subsequent step is with embodiment 1.

Embodiment 3

Optionally, terminal is in the resident process in community, and network terminal uniquely characterizes MBMS by MBSFN Area, carries service configuration information by MCCH; MBSFN sub-frame information is accurately provided by SIB13 and SIB2;

Optionally, carry MBSFN sub-frame information in SIB13 simultaneously;

Essentially in SIB2 carry MBSFN sub-frame information;

The present embodiment carries MBSFN sub-frame information simultaneously in SIB13 and SIB2, and subsequent processing steps is with embodiment 1;

From above embodiment, MBSFN sub-frame information can be carried individually in SIB13 or SIB2, identify MBSFN sub-frame, also can carry MBSFN sub-frame in SIB13 and SIB2, identify MBSFN sub-frame information.

Preferably, described terminal recognition MBSFN sub-frame comprises the reference signal design rule utilizing MBSFN sub-frame and conventional subframe, confirming, identifying MBSFN sub-frame by increasing channel frequency response characteristic in terminal.MCCH need not be followed the tracks of in a conventional way, only need do scheduled operation to channel frequency response characteristic, MBSFN sub-frame can be identified fast, and corresponding operating can also be multiplexing with other former existing survey calculation, cost is very low, the low-cost solution that the flow process for solving prior art identification MBSFN sub-frame is too complicated.

Specifically comprise:

Embodiment 4

Step 301, in the specific OFDM symbol of specific descending sub frame, extract Cell-specific reference signal;

In this step, described specific sub-frame is subframe 1,2,3,6,7,8 in frequency division multiplexing (FDD) community; It is subframe 3,4,7,8,9 in time division multiplexing (TDD) community;

The Cell-specific reference signal of described extraction, must comprise OFDM symbol 0 and at least one OFDM symbol of carrying Cell-specific reference signal except OFDM symbol 0;

Optionally, conventional cyclic prefix scene, extracts OFDM symbol 0 and OFDM symbol 4 and/or OFDM symbol 7 and/or OFDM symbol 11;

Optionally, extended cyclic prefix scene, extracts OFDM symbol 0 and OFDM symbol 3 and/or OFDM symbol 6 and/or OFDM symbol 9;

Step 302, for extract Cell-specific reference signal in units of OFDM symbol, carry out channel frequency response estimation;

Step 303, calculate OFDM symbol 0 and other OFDM symbol channel frequency response correlation based on channel estimation in frequency domain result, judge whether described correlation is less than predetermined threshold value Th, if so, then present sub-frame is MBSFN sub-frame; Otherwise present sub-frame is non-MBSFN sub-frame;

In this step, optionally, the account form of described channel frequency response correlation is:

$\mathrm{corr}=\underset{j}{\mathrm{\Σ}}\left|\underset{i}{\mathrm{\Σ}}\frac{{\mathrm{CFR}}_{i,0}\×{{\mathrm{CFR}}_{i,j}}^{*}}{\left|{\mathrm{CFR}}_{i,0}\right|\left|{\mathrm{CFR}}_{i,j}\right|}\right|$

Or

$\mathrm{corr}=\underset{j}{\mathrm{\Σ}}{\left|\underset{i}{\mathrm{\Σ}}\frac{{\mathrm{CFR}}_{i,0}\×{{\mathrm{CFR}}_{i,j}}^{*}}{\left|{\mathrm{CFR}}_{i,0}\right|\left|{\mathrm{CFR}}_{i,j}\right|}\right|}^2$

Wherein, CFR _i,jit is the frequency response of i-th subcarrier, a jth OFDM symbol;

Optionally, described predetermined threshold value Th span (0.6 ~ 1) × N × M, N is the sub-carrier number that single OFDM symbol participates in correlation operation, and M is the OFDM symbol number participating in computing except OFDM symbol 0;

Optionally, described predetermined threshold value Th span (-0.5 ~ 0.5) × Th0, Th0 is the correlation of the conventional subframe (i.e. non-MBSFN sub-frame) of historical record.

According to 3GPP standard TS36.211 regulation, MBSFN sub-frame is divided into non-MBSFN region and MBSFN region, and non-MBSFN region occupies 1 ~ 2 OFDM symbol according to subframe definition difference, for transmitting DCI indication information, carries Cell-specific reference signal; MBSFN region is used for PMCH transmission, carries MBSFN reference signal and does not comprise Cell-specific reference signal;

The present invention is under the prerequisite of unknown present sub-frame whether MBSFN sub-frame, assuming that the rule extraction Cell-specific reference signal of subframe routinely, obtain the OFDM symbol channel frequency response of carrying Cell-specific reference signal comprising OFDM symbol 0 respectively; Consider channel time selectivity, the channel frequency response correlation in subframe is obvious; Owing to not comprising Cell-specific reference signal in MBSFN region, channel frequency response accurately cannot be obtained according to above-mentioned computational methods, thus the correlation obtained will be extremely low in the MBSFN subframe, and this is just for the judgement of MBSFN sub-frame low-cost provides foundation.

Further, the low-cost characteristic of MBSFN sub-frame low-cost judgement of the present invention is also embodied in: the correlation that the present invention uses or power level decision method, go for equally comprising the operations such as Doppler's estimation, measurement, Timing Synchronization, visible respective relevancy judgement can have with other and operate multiplexing complexity, and therefore there is no significant workload increases.

Embodiment 5

Step 501, in the specific OFDM symbol of specific descending sub frame, extract Cell-specific reference signal;

In this step, described specific sub-frame is subframe 1,2,3,6,7,8 in frequency division multiplexing (FDD) community; It is subframe 3,4,7,8,9 in time division multiplexing (TDD) community;

The Cell-specific reference signal of described extraction, must comprise OFDM symbol 0 and at least one OFDM symbol of carrying Cell-specific reference signal except OFDM symbol 0;

Optionally, conventional cyclic prefix scene, extracts OFDM symbol 0 and OFDM symbol 4 and/or OFDM symbol 7 and/or OFDM symbol 11;

Optionally, extended cyclic prefix scene, extracts OFDM symbol 0 and OFDM symbol 3 and/or OFDM symbol 6 and/or OFDM symbol 9;

Step 502, for extract Cell-specific reference signal in units of OFDM symbol, carry out channel frequency response estimation;

Step 503, calculate OFDM symbol 0 and the frequency response intensity of other OFDM symbol based on channel estimation in frequency domain result, judge whether described symbol frequency response intensity is greater than predetermined threshold value Th, and if so, then present sub-frame is MBSFN sub-frame; Otherwise present sub-frame is non-MBSFN sub-frame;

In this step, optionally, the account form of described frequency response intensity is:

${\mathrm{Power}}_j=\underset{i}{\mathrm{\Σ}}{\left|{\mathrm{CFR}}_{i,j}\right|}^2$

Or

${\mathrm{Power}}_j=\underset{i}{\mathrm{\Σ}}\left|{\mathrm{CFR}}_{i,j}\right|$

Wherein, Power _jfor the frequency response intensity of a jth OFDM symbol, CFR _i,jit is the frequency response of i-th subcarrier, a jth OFDM symbol;

Optionally, described predetermined threshold value Th span 50% ~ 100%;

Optionally, described predetermined threshold value Th span (-0.5 ~ 0.5)/Th0, Th0 is the corresponding OFDM symbol 0 of the conventional subframe (i.e. non-MBSFN sub-frame) of historical record and the frequency response intensity rate of other OFDM symbol.

Can by identifying that SIB13 and/or SIB2 carries out from the visible terminal recognition MBSFN sub-frame of above embodiment, also can by utilizing the reference signal design rule of MBSFN sub-frame and conventional subframe, confirming by increasing channel frequency response characteristic in terminal, identifying MBSFN sub-frame.

As a kind of preferred implementation, can also carry out, described in specific as follows in conjunction with the reference signal design rule of SIB13 and/or SIB2 and MBSFN sub-frame and conventional subframe.

Embodiment 6

Preferably, described terminal recognition MBSFN sub-frame, as shown in Figure 1, can also in the following ways:

Terminal, in the resident process in community, obtains MBSFN sub-frame information, if obtain unsuccessfully by reading SIB13 or/SIB2, after Ze community is resident, utilize the reference signal design rule of MBSFN sub-frame and conventional subframe, scheduled operation is done to channel frequency response characteristic, identifies MBSFN sub-frame.

Described by reading SIB13 or/SIB2 acquisition MBSFN sub-frame information, adopt embodiment 1-3 either type, no longer describe in detail.

The described reference signal design rule utilizing MBSFN sub-frame and conventional subframe, does scheduled operation to channel frequency response characteristic, identifies MBSFN sub-frame, adopt embodiment 4-5 either type, no longer describe in detail.

Multicast single frequency network subframe recognition device of the present invention, as shown in Figure 2, comprising:

SIB read module M1, for reading SIB13 or/SIB2, described SIB2 and/or SIB13 is configured for instruction MBSFN Area, MCCH relevant information by network terminal, and described MBSFN Area uniquely characterizes MBMS, and described MCCH carries service configuration information.

MBSFN sub-frame identification module M2, for:

Utilize the SIB13 or/SIB2 identification MBSFN sub-frame that read,

And/or

Cell-specific reference signal is extracted in the specific OFDM symbol of specific descending sub frame; In units of OFDM symbol, channel frequency response estimation is carried out for the Cell-specific reference signal extracted; Calculate the channel frequency response characteristic of OFDM symbol 0 and other OFDM symbol based on channel estimation in frequency domain result, judge whether described channel frequency response characteristic is less than predetermined threshold value Th, if so, then present sub-frame is MBSFN sub-frame; Otherwise present sub-frame is non-MBSFN sub-frame.

MBMS receiver module M3, receives MBMS in MBSFN sub-frame for selecting according to user's request or does not receive MBMS.

The described SIB13 of reading or/SIB2 that utilizes identifies MBSFN sub-frame information, adopts embodiment 1-3 either type, no longer describes in detail.

Describedly in the specific OFDM symbol of specific descending sub frame, extract Cell-specific reference signal; In units of OFDM symbol, channel frequency response estimation is carried out for the Cell-specific reference signal extracted; Calculate the channel frequency response characteristic of OFDM symbol 0 and other OFDM symbol based on channel estimation in frequency domain result, judge whether described channel frequency response characteristic is less than predetermined threshold value Th, if so, then present sub-frame is MBSFN sub-frame; Otherwise present sub-frame is non-MBSFN sub-frame, adopts embodiment 4-5 either type, no longer describe in detail;

Especially, terminal, in the resident process in community, obtains MBSFN sub-frame information by reading SIB13 or/SIB2, if but obtained unsuccessfully, after Ze community is resident, would utilize the reference signal design rule of MBSFN sub-frame and conventional subframe, scheduled operation is done to channel frequency response characteristic, identifies MBSFN sub-frame.

The present invention, by identifying the limited information added in SIB13 and/or SIB2, realizes the MBSFN sub-frame identification of low-cost; And/or utilizing the reference signal design rule of MBSFN sub-frame and conventional subframe, terminal, by confirming in increase channel frequency response correlation or intensity, realizes the MBSFN sub-frame identification of low-cost; By above-mentioned various MBSFN sub-frame identification, for user is in the face of the MBMS increase more flexibility of horn of plenty and economy.

The present invention also provides a kind of multicast single frequency network end, described network terminal:

Configuration SIB2 and/or SIB13 carries MBSFN sub-frame information accurately, instruction multimedia broadcast-multicast service single-frequency network area MBSFN Area, Logical Traffic Channels MCCH relevant information, described MBSFNArea uniquely characterizes broadcasting multicast service MBMS, and described MCCH carries 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, does not repeat them here.

And/or

Configuration MBSFN sub-frame, is divided into non-MBSFN region and MBSFN region, and non-MBSFN region occupies 1 ~ 2 orthogonal frequency division multiplex OFDM symbol indication information according to subframe definition difference, carries community and specifies reference signal Cell-specific; MBSFN region is used for PMCH transmission, carries MBSFN reference signal and does not comprise Cell-specific reference signal;

Namely, Cell-specific reference signal is configured in the certain orthogonal frequency division multiplex OFDM symbol of specific descending sub frame, described specific sub-frame is subframe 1,2,3,6,7,8 in frequency division multiplexing FDD community, is subframe 3,4,7,8,9 in time division multiplexing TDD cell; Described specific OFDM symbol is OFDM symbol 0 and at least one OFDM symbol of carrying Cell-specific reference signal except OFDM symbol 0;

In conventional cyclic prefix scene, the described OFDM symbol of carrying Cell-specific reference signal except OFDM symbol 0 comprises OFDM symbol 4 and/or OFDM symbol 7 and/or OFDM symbol 11;

In extended cyclic prefix scene, the described OFDM symbol of carrying Cell-specific reference signal except OFDM symbol 0 comprises OFDM symbol 3 and/or OFDM symbol 6 and/or OFDM symbol 9.

Network terminal configuration SIB2 and/or SIB13 of the present invention carries MBSFN sub-frame information accurately, by SIB2 and/or SIB13 and identifiable design MBSFN sub-frame, or in the certain orthogonal frequency division multiplex OFDM symbol of specific descending sub frame, configure Cell-specific reference signal, terminal can by identifying that Cell-specific reference signal identifies MBSFN sub-frame, network terminal marks MBSFN sub-frame by above either type or both combinations, and being convenient to terminal recognition MBSFN sub-frame has more multi-selection and flexibility.

The present invention has carried out further detailed description for execution mode or embodiment to the object of the invention, technical scheme and advantage; be understood that; above lifted execution mode or embodiment are only the preferred embodiment of the present invention; not in order to limit the present invention; all any amendments made for the present invention within the spirit and principles in the present invention, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (11)

1. multicast single frequency network MBSFN sub-frame recognition methods, terminal, after identification MBSFN sub-frame, is selected to receive broadcasting multicast service MBMS in MBSFN sub-frame or do not receive broadcasting multicast service MBMS according to user's request, be it is characterized in that:

Described identification MBSFN sub-frame comprises:

When community is resident, read system message block SIB2 and/or SIB13, obtains MBSFN sub-frame information; Described SIB2 and/or SIB13 is configured for by network terminal and provides MBSFN sub-frame information accurately;

And/or

After community is resident, in the certain orthogonal frequency division multiplex OFDM symbol of specific descending sub frame, extract Cell-specific reference signal; In units of OFDM symbol, channel frequency response estimation is carried out for the Cell-specific reference signal extracted; Calculate the channel frequency response characteristic of OFDM symbol 0 and other OFDM symbol based on channel estimation in frequency domain result, judge whether described channel frequency response characteristic is less than predetermined threshold value Th, if so, then present sub-frame is MBSFN sub-frame; Otherwise present sub-frame is non-MBSFN sub-frame.

2. multicast single frequency network subframe recognition methods according to claim 1, is characterized in that, described OFDM symbol 0 and the channel frequency response characteristic of other OFDM symbol are OFDM symbol 0 and other OFDM symbol channel frequency response correlation:

$\mathrm{corr}=\underset{j}{\mathrm{\Σ}}\left|\underset{i}{\mathrm{\Σ}}\frac{{\mathrm{CFR}}_{i,0}\×{{\mathrm{CFR}}_{i,j}}^{*}}{\left|{\mathrm{CFR}}_{i,0}\right|\left|{\mathrm{CFR}}_{i,j}\right|}\right|$

Or

$\mathrm{corr}=\underset{j}{\mathrm{\Σ}}{\left|\underset{i}{\mathrm{\Σ}}\frac{{\mathrm{CFR}}_{i,0}\×{{\mathrm{CFR}}_{i,j}}^{*}}{\left|{\mathrm{CFR}}_{i,0}\right|\left|{\mathrm{CFR}}_{i,j}\right|}\right|}^2$

Wherein, CFR _i,jit is the frequency response of i-th subcarrier, a jth OFDM symbol;

Described predetermined threshold value Th span (0.6 ~ 1) × N × M, N is the sub-carrier number that single OFDM symbol participates in correlation operation, and M is the OFDM symbol number participating in computing except OFDM symbol 0;

Or,

Described predetermined threshold value Th span (-0.5 ~ 0.5) × Th0, Th0 is the correlation of the conventional subframe of historical record.

3. multicast single frequency network subframe recognition methods according to claim 1, is characterized in that, described OFDM symbol 0 and the channel frequency response characteristic of other OFDM symbol are the frequency response intensity of OFDM symbol 0 and other OFDM symbol:

${\mathrm{Power}}_j=\underset{i}{\mathrm{\Σ}}{\left|{\mathrm{CFR}}_{i,j}\right|}^2$

Or

${\mathrm{Power}}_j=\underset{i}{\mathrm{\Σ}}\left|{\mathrm{CFR}}_{i,j}\right|$

Wherein, Power _jfor the frequency response intensity of a jth OFDM symbol, CFR _i,jit is the frequency response of i-th subcarrier, a jth OFDM symbol;

Described predetermined threshold value Th span 50% ~ 100%;

Or

Described predetermined threshold value Th span (-0.5 ~ 0.5)/Th0, Th0 is the corresponding OFDM symbol 0 of the conventional subframe of historical record and the frequency response intensity rate of other OFDM symbol.

4. multicast single frequency network subframe recognition methods according to claim 1, is characterized in that, described specific sub-frame is subframe 1,2,3,6,7,8 in frequency division multiplexing FDD community, is subframe 3,4,7,8,9 in time division multiplexing TDD cell; Described specific OFDM symbol is OFDM symbol 0 and at least one OFDM symbol of carrying Cell-specific reference signal except OFDM symbol 0.

5. multicast single frequency network subframe recognition methods according to claim 4, is characterized in that,

In conventional cyclic prefix scene, the described OFDM symbol of carrying Cell-specific reference signal except OFDM symbol 0 comprises OFDM symbol 4 and/or OFDM symbol 7 and/or OFDM symbol 11;

In extended cyclic prefix scene, the described OFDM symbol of carrying Cell-specific reference signal except OFDM symbol 0 comprises OFDM symbol 3 and/or OFDM symbol 6 and/or OFDM symbol 9.

6. multicast single frequency network MBSFN sub-frame recognition device, is characterized in that, comprising:

SIB read module, to be configured for by network terminal for read system message block SIB13 and/or SIB2, described SIB2 and/or SIB13 and to provide MBSFN sub-frame information accurately;

MBSFN sub-frame identification module, for:

Utilize the SIB13 or/SIB2 identification MBSFN sub-frame information that read,

And/or

Cell-specific reference signal is extracted in the certain orthogonal frequency division multiplex OFDM symbol of specific descending sub frame; In units of OFDM symbol, channel frequency response estimation is carried out for the Cell-specific reference signal extracted; Calculate the channel frequency response characteristic of OFDM symbol 0 and other OFDM symbol based on channel estimation in frequency domain result, judge whether described channel frequency response characteristic is less than predetermined threshold value Th, if so, then present sub-frame is MBSFN sub-frame; Otherwise present sub-frame is non-MBSFN sub-frame;

MBMS receiver module, receives broadcasting multicast service MBMS in MBSFN sub-frame for selecting according to user's request or does not receive broadcasting multicast service MBMS.

7. multicast single frequency network subframe recognition device according to claim 6, is characterized in that, described OFDM symbol 0 and the channel frequency response characteristic of other OFDM symbol are OFDM symbol 0 and other OFDM symbol channel frequency response correlation:

$\mathrm{corr}=\underset{j}{\mathrm{\Σ}}\left|\underset{i}{\mathrm{\Σ}}\frac{{\mathrm{CFR}}_{i,0}\×{{\mathrm{CFR}}_{i,j}}^{*}}{\left|{\mathrm{CFR}}_{i,0}\right|\left|{\mathrm{CFR}}_{i,j}\right|}\right|$

Or

$\mathrm{corr}=\underset{j}{\mathrm{\Σ}}{\left|\underset{i}{\mathrm{\Σ}}\frac{{\mathrm{CFR}}_{i,0}\×{{\mathrm{CFR}}_{i,j}}^{*}}{\left|{\mathrm{CFR}}_{i,0}\right|\left|{\mathrm{CFR}}_{i,j}\right|}\right|}^2$

Wherein, CFR _i,jit is the frequency response of i-th subcarrier, a jth OFDM symbol;

Described predetermined threshold value Th span (0.6 ~ 1) × N × M, N is the sub-carrier number that single OFDM symbol participates in correlation operation, and M is the OFDM symbol number participating in computing except OFDM symbol 0

Or,

Described predetermined threshold value Th span (-0.5 ~ 0.5) × Th0, Th0 is the correlation of the conventional subframe of historical record.

8. multicast single frequency network subframe recognition device according to claim 6, it is characterized in that, multicast single frequency network subframe recognition methods according to claim 1, it is characterized in that, described OFDM symbol 0 and the channel frequency response characteristic of other OFDM symbol are the frequency response intensity of OFDM symbol 0 and other OFDM symbol:

${\mathrm{Power}}_j=\underset{i}{\mathrm{\Σ}}{\left|{\mathrm{CFR}}_{i,j}\right|}^2$

Or

${\mathrm{Power}}_j=\underset{i}{\mathrm{\Σ}}\left|{\mathrm{CFR}}_{i,j}\right|$

Wherein, Power _jfor the frequency response intensity of a jth OFDM symbol, CFR _i,jit is the frequency response of i-th subcarrier, a jth OFDM symbol;

Described predetermined threshold value Th span 50% ~ 100%;

Or

Described predetermined threshold value Th span (-0.5 ~ 0.5)/Th0, Th0 is the corresponding OFDM symbol 0 of the conventional subframe of historical record and the frequency response intensity rate of other OFDM symbol.

9. multicast single frequency network subframe recognition device according to claim 6, it is characterized in that, described specific sub-frame is subframe 1,2,3,6,7,8 in frequency division multiplexing FDD community, is subframe 3,4,7,8,9 in time division multiplexing TDD cell; Described specific OFDM symbol is OFDM symbol 0 and at least one OFDM symbol of carrying Cell-specific reference signal except OFDM symbol 0.

10. multicast single frequency network subframe recognition device according to claim 9, is characterized in that,

In conventional cyclic prefix scene, the described OFDM symbol of carrying Cell-specific reference signal except OFDM symbol 0 comprises OFDM symbol 4 and/or OFDM symbol 7 and/or OFDM symbol 11;

In extended cyclic prefix scene, the described OFDM symbol of carrying Cell-specific reference signal except OFDM symbol 0 comprises OFDM symbol 3 and/or OFDM symbol 6 and/or OFDM symbol 9.

11. multicast single frequency network ends, is characterized in that, described network terminal:

Configuration-system message blocks SIB2 and/or System information block SIB13 carries MBSFN sub-frame information accurately;

And/or

Configuration MBSFN sub-frame, is divided into non-MBSFN region and MBSFN region, and non-MBSFN region occupies 1 ~ 2 orthogonal frequency division multiplex OFDM symbol indication information according to subframe definition difference, carries community and specifies reference signal Cell-specific; MBSFN region is used for PMCH transmission, carries MBSFN reference signal and does not comprise Cell-specific reference signal.