CN101222675B - Method for transmitting and receiving multimedia broadcast multicast service in TDD mode - Google Patents
Method for transmitting and receiving multimedia broadcast multicast service in TDD mode Download PDFInfo
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Abstract
The invention discloses a method for transmitting and receiving multimedia broadcast and multicast services under TTD; all the cells in each base station form exactly the same MBMS symbol level data for spreading spectrum and scrambling, thereby forming baseband signals which are to be treated with transmitting in each cell; when the signals are transmitted, each cell uses different basic training sequences; according to system information, user equipment UE carries out channel evaluation to obtain the channel impulse response of each cell, and respectively calculates a system matrix corresponding to each cell and combines the system matrixs to a compound system matrix; an estimated MBMS service symbol level data is obtained by combining, detecting and processing the received baseband data and operated by demodulation and coding, thereby obtaining the original data of the MBMS service. The invention reduces the service interference, provides diversity and amplification and improves the transmission performance of the MBMS service.
Description
Technical Field
The present invention relates to a transmission and reception technique for MBMS (Multimedia Broadcast Multicast Service) in a wireless communication system, and more particularly, to a method for transmitting and receiving MBMS in TDD (Time Division Duplex) communication mode.
Background
The MBMS service is a high-speed unidirectional service transmitted in a broadcast or multicast form, which can efficiently transmit high-speed multimedia data to a plurality of users at the same time. MBMS requires that any user in the whole cell that activates the service can receive the content sent by the service. Since a point-to-multipoint (PtM) scheme in MBMS is transmitted in a broadcast manner, there is no feedback information in uplink, and a base station cannot obtain channel information of each user, a general power control method cannot be implemented, and downlink broadcast is usually transmitted at a constant power for a certain time.
Meanwhile, in a TDD wireless communication system, because the data rate of an MBMS service is higher, the number of code channels occupied by one MBMS service is larger than that of a P-CCPCH, and if the time slot power is the same, the single-code-channel transmitting power of an S-CCPCH of the MBMS service is smaller than that of the P-CCPCH, so that the MBMS service is also a broadcast channel, and the coverage range of the S-CCPCH channel carrying the MBMS service is much smaller than that of the P-CCPCH.
If the method of increasing the transmission power of the MBMS service is used to make up for the above deficiencies, in the network, in addition to increasing the signal power of the local cell, the signal power of the neighboring cell is correspondingly increased, so that the interference signal of the user terminal and the effective power are increased at the same time, and the signal-to-interference ratio of the user receiving signal is not improved. In this case, users in the middle of multiple cells cannot get the correct signal from the multiple interference.
In WO2005048484, a method for adjacent cells to transmit the same MBMS service in different time slots is proposed, so that data can be combined after the user equipment UE demodulates and receives the data, thereby providing macro diversity gain for the reception of the MBMS service. However, this method occupies too much time slot resources due to time slot transmission, and the cell management is complicated.
In summary, a transmitting and receiving method that can avoid inter-cell MBMS service interference and provide gain for the UE to receive the MBMS service should be found.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a method for transmitting and receiving an MBMS service in a TDD mode mobile communication system, so as to implement transmission and reception of the MBMS service, thereby not only avoiding interference of the MBMS service between cells, but also providing a gain for a UE to receive the MBMS service.
The invention provides a method for transmitting and receiving multimedia broadcast multicast service in time division duplex mode, which transmits and receives the multimedia broadcast multicast service between a base station side and user equipment, and comprises the following steps:
(1) the base station controller sends the multimedia broadcast multicast service MBMS data with the same format and the same content to each controlled base station at the same time to form the same MBMS symbol level data;
(2) each cell respectively carries out spread spectrum scrambling on the MBMS symbol level data obtained in the step (1) to form baseband signals to be transmitted of each cell, and each cell uses different training sequences during transmission;
(3) user Equipment (UE) at a receiving end detects system information in system broadcast of surrounding cells to obtain basic training sequences, spreading codes and scrambling code information of each cell, performs channel estimation on the received training sequences of each cell according to the basic training sequence information to obtain channel impulse responses corresponding to each cell, and respectively calculates system matrixes corresponding to each cell;
(4) and (4) merging the system matrixes corresponding to the cells obtained in the step (3) to obtain a composite system matrix, and performing joint detection processing on the received baseband data by using the composite system matrix to obtain the original data of the MBMS.
The base station controller controls a plurality of base stations, each of which in turn controls a number of cells, which are in a synchronous system.
The step (1) can be further divided into:
the base station controller sends the multimedia broadcast multicast service MBMS data with the same format and the same content to each controlled base station at the same time;
the base station controller controls all cells in each base station to respectively carry out consistent service mapping processing on the MBMS data to form a physical layer bit data stream;
the base station controller controls all cells in each base station to carry out a consistent data modulation process on the physical layer bit data stream, and MBMS symbol level data which are all the same in each cell are formed.
The step (2) can be further divided into:
each cell carries out spread spectrum scrambling on the MBMS symbol level data obtained after service mapping and modulation respectively, and the spread spectrum codes [ C ] of each cell are used1,C2,...,Cm]TDot-by-dot scrambling code Si=[si1,si2,...,siSF]Obtaining composite spread spectrum code V corresponding to each celliNamely:
wherein, Ci=[ci1,ci2,...,ciSF]I 1.. m, SF is a spreading factor;
using composite spreading codes V of each celliData for MBMS symbol leveliPerforming spread spectrum scrambling operation, namely: txi=datai.Vi1, 2.. n, forming baseband signals to be transmitted of each cell;
in transmission, each cell simultaneously transmits the baseband signal Tx in a time slot using different training sequencesi。
The step (3) can be further divided into:
the UE performs basic training sequence information M according to system information of each cell1,M2,...,MnFor received training sequence emidPerforming channel estimation, and calculating to obtain channel impulse response of each cell according to channel estimation algorithm,i=1,2,...,n;
The user equipment UE utilizes the composite spread spectrum code V of each celliAnd estimated channel impulse responseGenerating system matrix of each cell
The step (4) can be further divided into:
the system matrix corresponding to each cell obtained in the step (3) is processedAre combined to obtain a composite system matrix, i.e. <math><mrow>
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</mover>
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<mn>1</mn>
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Combining the system matrixPerforming joint detection processing on the baseband data received by the user equipment to obtain estimated MBMS service symbol level service data
For the MBMS service symbol level dataDemodulating and decoding to obtain original data of MBMS service
In the step (4):
the user equipment UE utilizes a joint detection module to carry out joint detection processing on the composite system matrix to obtain estimated MBMS service symbol level data;
the user equipment UE utilizes a decoding module to demodulate the estimated MBMS service symbol level data;
and the user equipment UE utilizes a decoding module to decode the estimated MBMS service symbol level data.
The invention provides an effective method for transmitting and receiving MBMS service in a TDD mode mobile communication system, which can greatly reduce service interference and provide diversity gain for a UE end, thereby improving the transmission performance of the MBMS service in the TDD mode.
Drawings
FIG. 1 is a block diagram of a network architecture of an embodiment of the present invention;
fig. 2 is a flow chart of base station sideband processing for the ith cell in an embodiment of the present invention;
fig. 3 is a flow chart of the baseband processing at the UE in the embodiment of the present invention.
Detailed Description
The technical solution of the present invention is further described in detail with reference to the accompanying drawings and specific embodiments.
Because the TDD system distributes the channel resources according to the time, each cell is a synchronous system, and different cells send the same MBMS at the same time by using the synchronous characteristic of the TDD system, the UE end can receive different copies of the same MBMS from different cells in the time, and the copies are subjected to signal detection and combination processing at the UE end, so that the original MBMS data is obtained. Therefore, the suppression capability of the interference between the cells can be provided, the receiving gain of the UE end is improved, and the MBMS service is effectively implemented in the TDD mode mobile communication system.
In the physical layer transmitting and receiving method of the MBMS service in the TDD mobile communication system according to this embodiment, a transmitting end transmits the same MBMS service in multiple cells, and a receiving end performs chip-level combining, thereby implementing transmission and reception of the multimedia broadcast multicast service. To achieve the above object, the method for transmitting and receiving an MBMS service provided in this embodiment includes the following steps:
step 1: the base station controller sends MBMS service data with the same format and the same content to each base station at the same time, and controls all cells in each base station to perform service mapping with the same format and perform data modulation with the same mode on the MBMS data. In this way, the MBMS data modulated by each cell is identical, that is, the cells transmit the identical MBMS data at the symbol level after data modulation at the same time:
step 2: and (3) each cell respectively carries out spread spectrum scrambling on the MBMS symbol level data obtained in the step (1) to form baseband signals to be transmitted by each cell, and finally the cells simultaneously transmit the MBMS service data in one time slot.
And step 3: user Equipment (UE) at a receiving end detects system information in system broadcast of surrounding cells, and obtains basic training sequences, spreading codes and scrambling code information of a plurality of cells; firstly, according to MBMS basic training sequence information received by UE, carrying out channel estimation on the received service training sequence of each cell to obtain the channel impulse response corresponding to each cell; and then, respectively calculating a system matrix corresponding to each cell according to the spreading code, the scrambling code information and the channel impulse response of each cell. The system information is transmitted to the UE through system broadcast, and the system information includes a basic training sequence, a spreading code, and a scrambling code used by each cell, and the training sequence used in channel estimation is a training sequence transmitted through a channel simultaneously with MBMS service data.
And 4, step 4: combining the system matrixes of the cells obtained in the step 3 to obtain a composite system matrix, bringing the composite system matrix into a UE joint detection module to detect the MBMS service symbol data, and then sending the MBMS service symbol data into a demodulation and decoding module to finally obtain the original data of the MBMS service.
Application example:
the following description will be made specifically by taking MBMS service in TD-SCDMA communication system as an example:
fig. 1 is a system flow diagram of a transmitting end and a receiving end of a multimedia broadcast multicast service MBMS in this embodiment. In TD-SCDMA systems, one base station controller controls multiple base stations (base station 1., base station m), and one base station may control multiple cells. In this embodiment, the base station controller transmits the same MBMS service data stream to each cell, and controls the same service mapping and modulation mode of each cell in the same timeslot, then each cell performs spreading scrambling on the MBMS service data, each cell uses different scrambling codes, and uses different basic training sequences, and then each cell sends out the MBMS service data at the same time; in the UE, the original MBMS service data is finally obtained by detecting the system information of all cells and then detecting, demodulating, and decoding the data according to the chip-level combining algorithm of this embodiment.
Fig. 2 is a flow chart of the processing at the transmitting end of the ith cell in the present embodiment. The transmitting end of this embodiment utilizes the TD-SCDMA system as the synchronization system, so that multiple cells transmit the same MBMS service data d at the same timeMBMS。
In step 201, the base station end zone of each cell performs service mapping processing on the data to form a physical layer bit data stream.
In step 202, data modulation is performed on the bit data stream to form symbol-level dataiThe symbol level data of each cell is the same, i.e.:
data=data1=data2=...=datan
wherein n represents the number of cells in which a target user equipment UE can receive a signal of a certain strength, datanSymbol-level data representing a signal of a certain strength received by the UE from the nth cell.
In a step 203 of the method, a step of,the m code channel spreading codes in one time slot of the ith cell are as follows: [ C ]1,C2,...,Cm]TIn which C isi=[ci1,ci2,...,ciSF]I 1.. m, SF is a spreading factor, and the scrambling code of the ith cell is Si=[si1,si2,...,siSF]Thus, the spreading code and the scrambling code of the cell i can be combined into a composite spreading code V of the ith celliAs follows:
accordingly, the composite spread spectrum code V of the local cell is utilizediData for symbol leveliPerforming spread spectrum scrambling operation, namely:
Txi=datai·Vi i=1,2,...,n
thereby, the baseband signal Tx to be transmitted of the ith cell can be obtainediThe other cells also adopt the above steps 201 and 203 to obtain the baseband signal to be transmitted of each cell, and each cell transmits the baseband signal at the same time. In transmission, each cell uses a different basic training sequence: m1,M2,...,Mn。
Fig. 3 is a flowchart of baseband processing at the receiving end in the present embodiment. At the receiving end, the received signal of the user terminal UE may be represented as:
wherein, <math><mrow>
<mi>A</mi>
<mo>=</mo>
<munderover>
<mi>Σ</mi>
<mrow>
<mi>j</mi>
<mo>=</mo>
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</mrow>
<mi>n</mi>
</munderover>
<mrow>
<mo>(</mo>
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<mo>*</mo>
<msub>
<mi>H</mi>
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</mrow>
</mrow></math> is a composite system matrix represented by the receiving end, and represents convolution operation.
In step 301, the UE firstly performs a training sequence e to the received UE according to the system information of each cellmidPerforming channel estimation, and setting the basic training sequence of the ith cell as MiAccording to the channel estimation algorithm, the channel impulse response of each cell can be obtained:
namely:
the system information is transmitted in a separate system broadcast channel and is therefore not included in the baseband signals transmitted by the respective cells in step 203 of fig. 2. Since a training sequence for channel estimation is inserted into the baseband signals transmitted by the cell, the UE receives these baseband signals and first performs channel estimation on the training sequence therein.
In step 302, the composite spreading code V of each cell is utilized1,V2,...,VnAnd estimated channel impulse responseAnd generating a system matrix of each cell, and respectively recording the system matrix as:
namely:
where (#) represents a convolution operation.
Namely: <math><mrow>
<mover>
<mi>A</mi>
<mo>^</mo>
</mover>
<mo>=</mo>
<munderover>
<mi>Σ</mi>
<mrow>
<mi>i</mi>
<mo>=</mo>
<mn>1</mn>
</mrow>
<mi>n</mi>
</munderover>
<msub>
<mover>
<mi>A</mi>
<mo>^</mo>
</mover>
<mi>i</mi>
</msub>
</mrow></math>
in step 304, the data part e received by the UE is processeddataAnd composite system matrixPerforming joint detection to obtain estimated symbol-level MBMS service data
Wherein (·)H) Representing a conjugate transpose operation.
In step 305, the estimatedPerforming line demodulation and decoding operation to obtain final original data of the MBMS:
in summary, the present invention can avoid the problem of co-channel interference between MBMS broadcast services in TDD mode, and can provide processing gain by using chip level combining; since the mode can transmit the high-speed MBMS service in one time slot, the system utilization rate is high. The method of the invention can efficiently support the MBMS service in the TD-SCMDA system.
Claims (7)
1. A method for transmitting and receiving multimedia broadcast multicast service in time division duplex mode is used for transmitting and receiving the multimedia broadcast multicast service between a base station side and user equipment, and is characterized by comprising the following steps:
(1) the base station controller sends the multimedia broadcast multicast service MBMS data with the same format and the same content to each controlled base station at the same time to form the same MBMS symbol level data;
(2) each cell respectively carries out spread spectrum scrambling on the MBMS symbol level data obtained in the step (1) to form baseband signals to be transmitted of each cell, and each cell uses different training sequences during transmission;
(3) user Equipment (UE) at a receiving end detects system information in system broadcast of surrounding cells to obtain basic training sequences, spreading codes and scrambling code information of each cell, performs channel estimation on the received training sequences of each cell according to the basic training sequence information to obtain channel impulse responses corresponding to each cell, and respectively calculates system matrixes corresponding to each cell;
(4) and (4) merging the system matrixes corresponding to the cells obtained in the step (3) to obtain a composite system matrix, and performing joint detection, demodulation and decoding processing on the received baseband data by using the composite system matrix to obtain the original data of the MBMS.
2. A method according to claim 1, characterized in that the base station controller controls a plurality of base stations, each of which in turn controls a number of cells, said cells being in a synchronous system.
3. The method of claim 1, wherein step (1) is further divided into:
the base station controller sends the multimedia broadcast multicast service MBMS data with the same format and the same content to each controlled base station at the same time;
the base station controller controls all cells in each base station to respectively carry out consistent service mapping processing on the MBMS data to form a physical layer bit data stream;
the base station controller controls all cells in each base station to carry out a consistent data modulation process on the physical layer bit data stream, and MBMS symbol level data which are all the same in each cell are formed.
4. The method of claim 1, wherein step (2) is further divided into:
each cell respectively carries out spread spectrum on the MBMS symbol level data obtained after service mapping and modulationScrambling by spreading codes [ C ] of respective cells1,C2,...,Cm]TDot-by-dot scrambling code Si=[si1,si2,...,siSF]Obtaining composite spread spectrum code V corresponding to each celliNamely:
wherein, Ci=[ci1,ci2,...,ciSF]I 1.. m, SF is a spreading factor;
using composite spreading codes V of each celliData for MBMS symbol leveliPerforming spread spectrum scrambling operation, namely: txi=datai·Vi1, 2.. n, forming baseband signals to be transmitted of each cell; in transmission, each cell simultaneously transmits the baseband signal Tx in a time slot using different training sequencesi。
5. The method of claim 1, wherein step (3) is further divided into:
the UE performs basic training sequence information M according to system information of each cell1,M2,...,MnFor received training sequence emidPerforming channel estimation, and calculating to obtain channel impulse response of each cell according to channel estimation algorithmi=1,2,...,n;
6. The method of claim 1 or 5, wherein step (4) is further divided into:
the system matrix corresponding to each cell obtained in the step (3) is processedAre combined to obtain a composite system matrix, i.e.
Combining the system matrixPerforming joint detection processing on the baseband data received by the user equipment to obtain estimated MBMS service symbol level service data
7. The method of claim 1, wherein in step (4):
the user equipment UE utilizes a joint detection module to carry out joint detection processing on the composite system matrix to obtain estimated MBMS service symbol level data;
the user equipment UE utilizes a decoding module to demodulate the estimated MBMS service symbol-level data;
and the user equipment UE utilizes a decoding module to decode the estimated MBMS service symbol level data.
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CN1719740A (en) * | 2004-07-05 | 2006-01-11 | 西门子(中国)有限公司 | Integrated detecting method for use in time-division-synchronous CDMA access system |
CN1879315A (en) * | 2003-11-12 | 2006-12-13 | Ip无线有限公司 | Method and apparatus for combining macro-diversity with timeslot re-use in a communication system |
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CN1719740A (en) * | 2004-07-05 | 2006-01-11 | 西门子(中国)有限公司 | Integrated detecting method for use in time-division-synchronous CDMA access system |
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