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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- 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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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 the field of communications technologies, and in particular, to a Multicast single Frequency Network (MBSFN) subframe identification method, apparatus, and Network terminal.
Background
With the rapid development of mobile interconnection, the user demand for broadcast multicast applications including mobile television and video conference is remarkably increased, and new service growth points are promoted. The broadcast multicast service requires that a plurality of users can receive the same information at the same time, and has the characteristics of large data volume, long duration, time delay sensitivity and the like. For this reason, the third generation Partnership Project (3 GPP) introduced a broadcast Multicast Service (MBMS) to meet the related demand.
According to the specification of 3GPP standard TS36.331, the MBMS service flow is as follows:
firstly, a network uniquely represents a segment of MBMS service through a multimedia broadcast Multicast service single frequency network Area (MBSFN Area), and defines a logical CHannel-Multicast control CHannel (MCCH for short) for each MBSFN Area for carrying service configuration information, including the location and configuration information of a Multicast service CHannel (MTCH for short), the configuration information of a Physical Multicast CHannel (PMCH for short), and the like; how to obtain the basic information of the MCCH is broadcasted through a system message block 13 (SIB 13), wherein the basic information comprises MBSFN Area information, MCCH subframe positions, MBSFN subframe positions, MCCH change notification indication positions and the like;
secondly, after the terminal completes cell residence, the terminal can acquire the MCCH position through SIB13, and then start to continuously receive the MTCH through MCCH indication;
thirdly, when the MBMS service is changed, the network end indicates to the terminal that the change occurs at the change notification position agreed in the SIB13 through a Physical Downlink Control Channel (PDCCH for short) (meanwhile, the SIB13 may also be updated synchronously through broadcast information change);
and finally, the terminal acquires the MCCH information change and continuously receives the MTCH again.
It can be known from the above that, when a terminal with MBMS service capability successfully completes reception of a broadcast multicast MBMS service, it needs to successfully receive a broadcast message and an MCCH before starting reception of the MTCH, and in this process, it needs to continuously monitor a PDCCH to grasp a change status of the MCCH in time. The MBSFN location in the current standard is carried by MCCH (SIB 2, although carrying it is also carried but belongs to the complete set of information, only provides the maximum possibility, actually configuring PMCH and does not provide indication information), regardless of whether UE is interested in MBSFN service, MCCH must be continuously monitored, however, when user no longer desires to receive MBMS service, or user no longer desires to receive MBMS service and still desires to normally receive Physical Downlink Shared Channel (PDSCH) possibly transmitted on MBSFNsubframe, or user no longer desires to receive MBMS service and desires to perform auxiliary processing (such as noise power estimation) by using MBSFN subframe that does not transmit PMCH and PDSCH, the existing processing flow will bring great unnecessary receiving overhead to the terminal side, thereby seriously affecting the terminal standby time and user experience.
According to the specification of 3GPP standard TS36.211, an MBSFN subframe specified in an MBMS service flow is divided into a non-MBSFN area and an MBSFN area, the non-MBSFN area occupies 1 to 2 orthogonal frequency division multiplexing OFDM symbols (when occupying 1 OFDM symbol, it means OFDM0, and when occupying 2 OFDM symbols, it means OFDM0 and 1) differently according to the subframe definition, is used for transmitting DCI (Downlink control information) indication information, and carries a Cell-specific reference signal Cell-specific; the MBSFN area is used for PMCH transmission and carries MBSFN reference signals without containing Cell-specific reference signals. The PMCH only uses a single-antenna Multiple-Input Multiple-output (MIMO) mode and extended cyclic prefix configuration, MBSFN reference signals matched with specific resource units support receiving equalization when the PMCH transmits, and Cell-specific reference signals no longer exist in MBSFN areas where the PMCH exists. That is, the Cell-specific reference signal does not exist in the MBSFN area of the MBSFN subframe, the Cell-specific reference signal exists in the non-MBSFN area of the MBSFN subframe, and the Cell-specific reference signal necessarily exists in the normal downlink subframe, and the distribution of the Cell-specific reference signal is known.
Due to the above-mentioned particularity of the MBSFN subframe, after a terminal which does not expect to receive the MBMS service or does not support to receive the MBMS service (MBMS is optional in the 3GPP feature definition) resides in the MBSFN Cell, the MBSFN subframe must be accurately identified, otherwise, the MBSFN subframe is regarded as a conventional downlink subframe to perform channel estimation, measurement, timing/frequency synchronization and other actions, but is completely abnormal due to the absence of the Cell-specific reference signal.
Based on the foregoing MBMS flow analysis, for a terminal that does not expect to receive the MBMS service or does not support receiving the MBMS service, a flow of identifying the MBSFN subframe in the prior art is too complex, and unnecessary overhead and cost are too large, which are not favorable for terminal standby and power consumption saving.
Disclosure of Invention
In order to solve the problems, the invention provides a method for identifying a multicast single frequency network subframe, after identifying an MBSFN subframe, a terminal selects to receive MBMS service or not to receive MBMS service in the MBSFN subframe according to the requirement of a user;
the identifying the MBSFN subframe comprises:
reading SIB2 and/or SIB13 when the cell is resident, and acquiring MBSFN subframe information; the SIB2 and/or SIB13 provides accurate MBSFN subframe information through network side configuration;
and/or
After the Cell is resident, extracting a Cell-specific reference signal from a specific OFDM symbol of a specific downlink subframe; performing channel frequency response estimation on the extracted Cell-specific reference signal by taking an OFDM symbol as a unit; calculating channel frequency response characteristics of the OFDM symbol 0 and other OFDM symbols based on the frequency domain channel estimation result, judging whether the channel frequency response characteristics are smaller than a preset threshold value Th, and if so, determining that the current subframe is an MBSFN subframe; otherwise, the current subframe is a non-MBSFN subframe.
In order to solve the above problems, the present invention further provides a multicast single frequency network subframe identification apparatus, including:
an SIB reading module for reading SIB13 or/and SIB2, wherein the SIB2 and/or SIB13 provides accurate MBSFN subframe information by network side configuration;
an MBSFN subframe identification module, configured to:
the MBSFN subframe information is identified with the read SIB13 or/SIB 2,
and/or
Extracting a Cell-specific reference signal from a specific OFDM symbol of a specific downlink subframe; performing channel frequency response estimation on the extracted Cell-specific reference signal by taking an OFDM symbol as a unit; calculating channel frequency response characteristics of the OFDM symbol 0 and other OFDM symbols based on the frequency domain channel estimation result, judging whether the channel frequency response characteristics are smaller than a preset threshold value Th, and if so, determining that the current subframe is an MBSFN subframe; otherwise, the current subframe is a non-MBSFN subframe;
and the MBMS receiving module is used for selecting to receive the MBMS or not to receive the MBMS in the MBSFN subframe according to the user requirement.
In order to solve the above problems, the present invention further provides a multicast single frequency network, where the network:
configuring a system message block SIB2 and/or a system message block SIB13 to carry accurate MBSFN subframe information;
and/or
Configuring an MBSFN subframe, dividing the MBSFN subframe into a non-MBSFN area and an MBSFN area, wherein the non-MBSFN area occupies 1-2 Orthogonal Frequency Division Multiplexing (OFDM) symbol indication information differently according to the definition of the subframe and carries a Cell-specific reference signal; the MBSFN area is used for PMCH transmission and carries MBSFN reference signals without containing Cell-specific reference signals.
The invention realizes MBSFN subframe identification by adding limited information in SIB13 and/or SIB 2; and/or the MBSFN subframe identification is realized by increasing the channel frequency response correlation or strength confirmation at the terminal by utilizing the reference signal design rule of the MBSFN subframe and the conventional subframe; and through various MBSFN subframe identifications, richer flexibility and economy are increased for the user facing the MBMS service.
Drawings
Fig. 1 is a schematic flowchart of a preferred embodiment of a multicast single frequency network subframe identification method according to the present invention;
fig. 2 is a schematic structural diagram of a preferred embodiment of a multicast single frequency network subframe identification apparatus according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments.
The invention discloses a multicast single frequency network subframe identification method.A terminal identifies an MBSFN subframe and selects to receive MBMS service or not to receive the MBMS service in the MBSFN subframe according to user requirements.
Preferably, the terminal identifies the MBSFN subframe including in the cell camping process, and identifies the MBSFN subframe by reading SIB information, including multiple implementation manners, which are respectively introduced as follows:
example 1
Optionally, in the cell residence process, the terminal acquires the MCCH according to SIB13, and acquires the MBSFN subframe location through the MCCH;
the network end uniquely represents the MBMS through the MBSFN Area and carries service configuration information through the MCCH; indicating MBSFN Area and MCCH related information through SIB 13;
when the SIB13 already carries MBSFN subframe information, the MBSFN subframe position is directly obtained based on an information unit MBSFN-subframe configuration in the SIB 13;
for example, the code marked with the asn.1 abstract syntax is represented as follows:
in this embodiment, the new subframe information configuration unit "MBSFN-subframe configuration" in SIB13 carries MBSFN subframe information. In the existing 3GPP TS36.331, SIB13 does not include the IE (Information Element), and the IE adds limited Information in network side SIB13 in MCCH to realize low-cost MBSFN subframe identification; because the MBSFN subframe information exists in the broadcast information, the cost and the cost for obtaining the related information by the terminal which does not receive or support the MBSFN service are obviously reduced, and the code representation mode marked by the ASN.1 abstract syntax belongs to the known technology in the field and is not detailed.
In accordance with 3GPP TS36.331, "MBSFN-SubframeConfig" contains the following information:
respectively defining the radio frame number of the MBSFN subframe together corresponding to the radio frame allocation period and the radio frame allocation offset; the subframe allocation mode specifically defines which subframes in a wireless frame are MBSFN subframes; for details, reference may be made to 3gpp ts 36.331.
The radio frame allocation period, the offset and the subframe allocation information are integrated, and clear MBSFN subframe position indication can be realized.
After the identification of the multicast single-frequency network subframe is completed, the terminal selects to receive the MBMS service in the MBSFN subframe or skip the MBMS service reception according to the user requirement.
Example 2
Optionally, in the cell residence process of the terminal, the network end uniquely represents the MBMS service through the MBSFN Area, and carries the service configuration information through the MCCH; indicating accurate MBSFN subframe information by SIB 2;
the SIB2 optionally carries MBSFN subframe information;
for example, the code marked with the asn.1 abstract syntax is represented as follows:
the OPTIONAL original IE "mbsfn-SubframeConfigList" is configured for OPTIONAL, removing the "options" indication, ensuring that relevant information will always appear in SIB 2.
Since the "MBSFN-subframe configlist" includes the "MBSFN-subframe config" information, a clear indication of the MBSFN subframe position is achieved as in the preferred embodiment 1.
The subsequent steps were the same as in example 1.
Example 3
Optionally, in the cell residence process of the terminal, the network end uniquely represents the MBMS service through the MBSFN Area, and carries the service configuration information through the MCCH; providing accurate MBSFN subframe information through SIB13 and SIB 2;
optionally, the SIB13 simultaneously carries MBSFN subframe information;
the SIB2 optionally carries MBSFN subframe information;
in this embodiment, the SIB13 and the SIB2 simultaneously carry MBSFN subframe information, and the subsequent processing steps are the same as those in embodiment 1;
as can be seen from the above embodiments, the MBSFN subframe information may be separately carried in SIB13 or SIB2 to identify the MBSFN subframe, or the MBSFN subframe information may be carried in SIB13 and SIB2 to identify the MBSFN subframe.
Preferably, the terminal identifies the MBSFN subframe by using the reference signal design rule of the MBSFN subframe and the regular subframe, and identifying the MBSFN subframe by adding channel frequency response characteristic confirmation to the terminal. The MBSFN subframe can be quickly identified only by performing predetermined operation on the channel frequency response characteristic without tracking the MCCH in a conventional mode, and the corresponding operation can be multiplexed with other original measurement calculation, so that the cost is very low, and the low-cost solution scheme that the flow for identifying the MBSFN subframe in the prior art is too complex is solved.
The method specifically comprises the following steps:
example 4
Step 301, extracting a Cell-specific reference signal from a specific OFDM symbol of a specific downlink subframe;
in this step, the specific subframe is a subframe 1, 2, 3, 6, 7, 8 in a Frequency Division Duplex (FDD) cell; subframes 3, 4, 7, 8, 9 in a Time Division Duplex (TDD) cell;
the extracted Cell-specific reference signal must contain an OFDM symbol 0 and at least one OFDM symbol which carries the Cell-specific reference signal except the OFDM symbol 0;
optionally, in a conventional cyclic prefix scenario, extracting OFDM symbol 0 and OFDM symbol 4 and/or OFDM symbol 7 and/or OFDM symbol 11;
optionally, the cyclic prefix scenario is extended, and OFDM symbol 0 and OFDM symbol 3 and/or OFDM symbol 6 and/or OFDM symbol 9 are extracted;
step 302, estimating channel frequency response by taking OFDM symbols as units according to the extracted Cell-specific reference signals;
step 303, calculating the frequency response correlation between the OFDM symbol 0 and other OFDM symbols based on the frequency domain channel estimation result, and determining whether the correlation is smaller than a preset threshold Th, if so, the current subframe is an MBSFN subframe; otherwise, the current subframe is a non-MBSFN subframe;
in this step, optionally, the channel frequency response correlation is calculated in the following manner:
or
Wherein, CFRi,jThe frequency response of the ith subcarrier and the jth OFDM symbol is obtained;
optionally, the value range of the preset threshold Th is (0.6-1) × N × M, N is the number of subcarriers of a single OFDM symbol participating in correlation operation, and M is the number of OFDM symbols participating in operation except for OFDM symbol 0;
optionally, the preset threshold value Th is in a value range of (-0.5 to 0.5) x Th0, and Th0 is a correlation of a historical regular subframe (i.e., a non-MBSFN subframe).
According to the specification of 3GPP standard TS36.211, an MBSFN subframe is divided into a non-MBSFN region and an MBSFN region, the non-MBSFN region occupies 1-2 OFDM symbols according to the definition of the subframe, is used for transmitting DCI (Downlink control information) indication information and carries Cell-specific reference signals; the MBSFN area is used for PMCH transmission and carries MBSFN reference signals without Cell-specific reference signals;
on the premise of not knowing whether the current subframe is an MBSFN subframe, Cell-specific reference signals are supposed to be extracted according to the rule of a conventional subframe, and OFDM symbol channel frequency responses carrying the Cell-specific reference signals and including an OFDM symbol 0 are respectively obtained; considering the channel time selectivity, the channel frequency response correlation in the subframe is obvious; since the MBSFN area does not contain the Cell-specific reference signal, the accurate channel frequency response cannot be obtained according to the calculation method, so that the obtained correlation is extremely low in the MBSFN subframe, and a basis is provided for low-cost judgment of the MBSFN subframe.
Further, the low-cost characteristic of the MBSFN subframe low-cost judgment of the invention is also embodied in that: the correlation or power strength judgment method used by the invention can also be suitable for operations including Doppler estimation, measurement, timing synchronization and the like, and the corresponding correlation judgment can be multiplexed with other existing operations with complexity, so that the workload is not obviously increased.
Example 5
Step 501, extracting a Cell-specific reference signal from a specific OFDM symbol of a specific downlink subframe;
in this step, the specific subframe is a subframe 1, 2, 3, 6, 7, 8 in a Frequency Division Duplex (FDD) cell; subframes 3, 4, 7, 8, 9 in a Time Division Duplex (TDD) cell;
the extracted Cell-specific reference signal must contain an OFDM symbol 0 and at least one OFDM symbol which carries the Cell-specific reference signal except the OFDM symbol 0;
optionally, in a conventional cyclic prefix scenario, extracting OFDM symbol 0 and OFDM symbol 4 and/or OFDM symbol 7 and/or OFDM symbol 11;
optionally, the cyclic prefix scenario is extended, and OFDM symbol 0 and OFDM symbol 3 and/or OFDM symbol 6 and/or OFDM symbol 9 are extracted;
step 502, performing channel frequency response estimation on the extracted Cell-specific reference signal by taking an OFDM symbol as a unit;
step 503, calculating the frequency response intensity of the OFDM symbol 0 and other OFDM symbols based on the frequency domain channel estimation result, and determining whether the frequency response intensity of the symbol is greater than a preset threshold Th, if so, the current subframe is an MBSFN subframe; otherwise, the current subframe is a non-MBSFN subframe;
in this step, optionally, the calculation method of the frequency response intensity is as follows:
or
Wherein, PowerjIs the frequency response intensity, CFR, of the jth OFDM symboli,jThe frequency response of the ith subcarrier and the jth OFDM symbol is obtained;
optionally, the value range of the preset threshold Th is 50% -100%;
optionally, the preset threshold value Th ranges from (-0.5 to 0.5)/Th0, and Th0 is a frequency response intensity ratio of the corresponding OFDM symbol 0 to other OFDM symbols of the historical regular subframe (i.e., the non-MBSFN subframe).
It can be seen from the above embodiments that the terminal may identify the MBSFN subframe by identifying SIB13 and/or SIB2, or may identify the MBSFN subframe by adding channel frequency response characteristic acknowledgement to the terminal by using the reference signal design rule of the MBSFN subframe and the regular subframe.
As a preferred embodiment, the reference signal design rule of SIB13 and/or SIB2 and MBSFN subframe and regular subframe may be combined, as described below.
Example 6
Preferably, the terminal identifies the MBSFN subframe, as shown in fig. 1, the following method may also be adopted:
the terminal acquires the MBSFN subframe information by reading SIB13 or/SIB 2 in the cell residence process, and if the acquisition fails, after the cell residence, the terminal performs predetermined operation on the channel frequency response characteristic by using the reference signal design rule of the MBSFN subframe and the conventional subframe to identify the MBSFN subframe.
The method for acquiring the MBSFN subframe information by reading the SIB13 or/SIB 2 adopts any mode of the embodiments 1-3, and is not described in detail.
The method for identifying the MBSFN subframe by utilizing the reference signal design rule of the MBSFN subframe and the conventional subframe to perform the predetermined operation on the channel frequency response characteristic adopts any mode of the embodiment 4-5, and is not described in detail.
The present invention relates to a multicast single frequency network subframe recognition device, as shown in fig. 2, including:
an SIB reading module M1, configured to read SIB13 or/and SIB2, where the SIB2 and/or SIB13 are configured by a network end to indicate MBSFN Area and MCCH related information, where the MBSFN Area uniquely represents an MBMS service, and the MCCH carries service configuration information.
An MBSFN subframe identification module M2, configured to:
the MBSFN subframe is identified with the read SIB13 or/SIB 2,
and/or
Extracting a Cell-specific reference signal from a specific OFDM symbol of a specific downlink subframe; performing channel frequency response estimation on the extracted Cell-specific reference signal by taking an OFDM symbol as a unit; calculating channel frequency response characteristics of the OFDM symbol 0 and other OFDM symbols based on the frequency domain channel estimation result, judging whether the channel frequency response characteristics are smaller than a preset threshold value Th, and if so, determining that the current subframe is an MBSFN subframe; otherwise, the current subframe is a non-MBSFN subframe.
And the MBMS service receiving module M3 is configured to select to receive the MBMS service or not to receive the MBMS service in the MBSFN subframe according to a user requirement.
The MBSFN subframe information is identified by using the read SIB13 or/SIB 2, and any mode of the embodiments 1-3 is adopted, which is not described in detail.
Extracting a Cell-specific reference signal from a specific OFDM symbol of a specific downlink subframe; performing channel frequency response estimation on the extracted Cell-specific reference signal by taking an OFDM symbol as a unit; calculating channel frequency response characteristics of the OFDM symbol 0 and other OFDM symbols based on the frequency domain channel estimation result, judging whether the channel frequency response characteristics are smaller than a preset threshold value Th, and if so, determining that the current subframe is an MBSFN subframe; otherwise, the current subframe is a non-MBSFN subframe, and any mode of the embodiment 4-5 is adopted, so that the detailed description is omitted;
specifically, the terminal acquires the MBSFN subframe information by reading SIB13 or/SIB 2 during the cell residence process, but if the acquisition fails, after the cell residence, the terminal performs a predetermined operation on the channel frequency response characteristic by using the reference signal design rule of the MBSFN subframe and the conventional subframe to identify the MBSFN subframe.
The invention realizes the MBSFN subframe identification with low cost by identifying the limited information added in the SIB13 and/or SIB 2; and/or by utilizing the reference signal design rule of the MBSFN subframe and the conventional subframe, the terminal realizes the identification of the MBSFN subframe with low cost by increasing the channel frequency response correlation or strength confirmation; through the various MBSFN sub-frame identification, richer flexibility and economy are increased for the user facing the MBMS service.
The invention also provides a multicast single frequency network end, which comprises the following steps:
configuring SIB2 and/or SIB13 to carry accurate MBSFN subframe information for indicating a multimedia broadcast multicast service single frequency network Area MBSFN Area and related information of a multicast service channel MCCH, wherein the MBSFNArea uniquely represents a broadcast multicast service MBMS, and the MCCH carries service configuration information;
specific ways of configuring SIB2 and/or SIB13 to carry MBSFN subframe information are described in embodiments 1-3, and are not described herein again.
And/or
Configuring an MBSFN subframe, dividing the MBSFN subframe into a non-MBSFN area and an MBSFN area, wherein the non-MBSFN area occupies 1-2 Orthogonal Frequency Division Multiplexing (OFDM) symbol indication information differently according to the definition of the subframe and carries a Cell-specific reference signal; the MBSFN area is used for PMCH transmission and carries MBSFN reference signals without Cell-specific reference signals;
that is, a Cell-specific reference signal is configured in a specific orthogonal frequency division multiplexing OFDM symbol of a specific downlink subframe, where the specific subframe is subframe 1, 2, 3, 6, 7, 8 in a frequency division multiplexing FDD Cell, and subframe 3, 4, 7, 8, 9 in a time division multiplexing TDD Cell; the specific OFDM symbol is an OFDM symbol 0 and at least one OFDM symbol which carries a Cell-specific reference signal except the OFDM symbol 0;
in a normal cyclic prefix scenario, the OFDM symbols other than OFDM symbol 0 that carry Cell-specific reference signals include OFDM symbol 4 and/or OFDM symbol 7 and/or OFDM symbol 11;
in the extended cyclic prefix scenario, the OFDM symbols carrying the Cell-specific reference signal other than OFDM symbol 0 include OFDM symbol 3 and/or OFDM symbol 6 and/or OFDM symbol 9.
In the invention, the network terminal configures SIB2 and/or SIB13 to carry accurate MBSFN subframe information, the MBSFN subframe can be identified through SIB2 and/or SIB13, or a Cell-specific reference signal is configured in a specific orthogonal frequency division multiplexing OFDM symbol of a specific downlink subframe, the terminal can identify the MBSFN subframe through identifying the Cell-specific reference signal, the network terminal marks the MBSFN subframe through any one of the above modes or the combination of the two modes, and the terminal can conveniently identify the MBSFN subframe and has more selectivity and flexibility.
The purpose, technical solutions and advantages of the present invention are further described in detail by using the embodiments or examples of the present invention, it should be understood that the above embodiments or examples are only preferred embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (11)
1. A multicast single frequency network MBSFN subframe identification method is characterized in that after identifying an MBSFN subframe, a terminal selects to receive a broadcast multicast service MBMS or not to receive the broadcast multicast service MBMS in the MBSFN subframe according to user requirements, and the method comprises the following steps:
the identifying the MBSFN subframe comprises:
when the cell is resident, reading a system message block SIB2 and/or SIB13, and acquiring MBSFN subframe information; the SIB2 and/or SIB13 are configured by a network side to provide accurate MBSFN subframe information;
and/or
After the Cell is resident, extracting a Cell-specific reference signal from a specific Orthogonal Frequency Division Multiplexing (OFDM) symbol of a specific downlink subframe; performing frequency domain channel estimation on the extracted Cell-specific reference signal by taking an OFDM symbol as a unit; calculating channel frequency response characteristics of the OFDM symbol 0 and other OFDM symbols based on the frequency domain channel estimation result, judging whether the channel frequency response characteristics are smaller than a preset threshold value Th, and if so, determining that the current subframe is an MBSFN subframe; otherwise, the current subframe is a non-MBSFN subframe.
2. The method according to claim 1, wherein the channel frequency response characteristics of the OFDM symbol 0 and other OFDM symbols are the channel frequency response correlation of the OFDM symbol 0 and other OFDM symbols:
or
Wherein, CFRi,jThe frequency response of the ith subcarrier and the jth OFDM symbol is obtained;
the value range of the preset threshold Th is 0.6 multiplied by N multiplied by M-1 multiplied by N multiplied by M, N is the number of subcarriers of a single OFDM symbol participating in correlation operation, and M is the number of OFDM symbols participating in operation except for the OFDM symbol 0;
or,
the preset threshold value Th ranges from-0.5 multiplied by Th0 to 0.5 multiplied by Th0, and Th0 is the correlation of historical conventional subframes.
3. The method according to claim 1, wherein the channel frequency response characteristics of the OFDM symbol 0 and other OFDM symbols are the frequency response strength of OFDM symbol 0 and other OFDM symbols:
or
Wherein, PowerjIs the frequency response intensity, CFR, of the jth OFDM symboli,jThe frequency response of the ith subcarrier and the jth OFDM symbol is obtained;
the value range of the preset threshold Th is 50% -100%;
or
The preset threshold value Th ranges from-0.5 Th0 to 0.5/Th0, and Th0 is the frequency response intensity ratio of the corresponding OFDM symbol 0 and other OFDM symbols of the conventional subframe recorded in history.
4. The method of claim 1, wherein the specific subframe is subframe 1, 2, 3, 6, 7, 8 in a Frequency Division Duplex (FDD) cell, or subframe 3, 4, 7, 8, 9 in a Time Division Duplex (TDD) cell; the specific OFDM symbol is OFDM symbol 0 and at least one OFDM symbol except OFDM symbol 0, which carries Cell-specific reference signal.
5. The method according to claim 4, wherein in a normal cyclic prefix scenario, the OFDM symbols carrying Cell-specific reference signals except OFDM symbol 0 comprise OFDM symbol 4 and/or OFDM symbol 7 and/or OFDM symbol 11;
in the extended cyclic prefix scenario, the OFDM symbols carrying the Cell-specific reference signal other than OFDM symbol 0 include OFDM symbol 3 and/or OFDM symbol 6 and/or OFDM symbol 9.
6. Multicast single frequency network MBSFN subframe identification device, characterized by comprising:
an SIB reading module for reading a system message block SIB13 and/or SIB2, wherein the SIB2 and/or SIB13 are configured by a network side for providing accurate MBSFN subframe information;
an MBSFN subframe identification module, configured to:
the MBSFN subframe information is identified with the read SIB13 or/SIB 2,
and/or
Extracting a Cell-specific reference signal from a specific Orthogonal Frequency Division Multiplexing (OFDM) symbol of a specific downlink subframe; performing frequency domain channel estimation on the extracted Cell-specific reference signal by taking an OFDM symbol as a unit; calculating channel frequency response characteristics of the OFDM symbol 0 and other OFDM symbols based on the frequency domain channel estimation result, judging whether the channel frequency response characteristics are smaller than a preset threshold value Th, and if so, determining that the current subframe is an MBSFN subframe; otherwise, the current subframe is a non-MBSFN subframe;
and the MBMS receiving module is used for selecting to receive the broadcast multicast service MBMS or not to receive the broadcast multicast service MBMS in the MBSFN subframe according to the user requirement.
7. The apparatus of claim 6, wherein the channel frequency response of the OFDM symbol 0 and other OFDM symbols is the channel frequency response correlation of OFDM symbol 0 and other OFDM symbols:
or
Wherein, CFRi,jThe frequency response of the ith subcarrier and the jth OFDM symbol is obtained;
the value range of the preset threshold Th is 0.6 multiplied by N multiplied by M-1 multiplied by N multiplied by M, N is the number of subcarriers of a single OFDM symbol participating in correlation operation, and M is the number of OFDM symbols participating in operation except for the OFDM symbol 0; or,
the preset threshold value Th ranges from-0.5 multiplied by Th0 to 0.5 multiplied by Th0, and Th0 is the correlation of historical conventional subframes.
8. The apparatus for identifying multicast single frequency network (MBSFN) subframes according to claim 6, wherein the method for identifying multicast single frequency network subframes according to claim 1 is characterized in that the channel frequency response characteristics of the OFDM symbol 0 and other OFDM symbols are the frequency response strength of the OFDM symbol 0 and other OFDM symbols:
or
Wherein, PowerjIs the frequency response intensity, CFR, of the jth OFDM symboli,jThe frequency response of the ith subcarrier and the jth OFDM symbol is obtained;
the value range of the preset threshold Th is 50% -100%;
or
The preset threshold value Th ranges from-0.5/Th 0 to 0.5/Th0, and Th0 is the frequency response intensity ratio of the corresponding OFDM symbol 0 and other OFDM symbols of the conventional subframe recorded in history.
9. The apparatus of claim 6, wherein the specific subframe is subframe 1, 2, 3, 6, 7, 8 in a Frequency Division Duplex (FDD) cell, or subframe 3, 4, 7, 8, 9 in a Time Division Duplex (TDD) cell; the specific OFDM symbol is OFDM symbol 0 and at least one OFDM symbol except OFDM symbol 0, which carries Cell-specific reference signal.
10. The apparatus of claim 9, wherein in a normal cyclic prefix scenario, the OFDM symbols carrying Cell-specific reference signals other than OFDM symbol 0 comprise OFDM symbol 4 and/or OFDM symbol 7 and/or OFDM symbol 11;
in the extended cyclic prefix scenario, the OFDM symbols carrying the Cell-specific reference signal other than OFDM symbol 0 include OFDM symbol 3 and/or OFDM symbol 6 and/or OFDM symbol 9.
11. A multicast single frequency network, wherein the network: configuring a system message block SIB2 and/or a system message block SIB13 to carry accurate MBSFN subframe information;
and/or
Configuring an MBSFN subframe, dividing the MBSFN subframe into a non-MBSFN area and an MBSFN area, wherein the non-MBSFN area occupies 1-2 Orthogonal Frequency Division Multiplexing (OFDM) symbol indication information differently according to the definition of the subframe and carries a Cell-specific reference signal; the MBSFN area is used for PMCH transmission and carries MBSFN reference signals without containing Cell-specific reference signals.
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