CN102271023A - Method and device for detecting system frame number of long term evolution (LTE) system - Google Patents
Method and device for detecting system frame number of long term evolution (LTE) system Download PDFInfo
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Abstract
The invention relates to the field of wireless communication, and in particular relates to a method and device for detecting a system frame number of a long-term evolution (LTE) system. The method comprises the following steps of: equally dividing a scrambling sequence C of a TTI (transmission time interval) into four sections by using the self-decoding characteristic of PBCH (physical broadcast channel) data of a wireless frame, respectively descrambling with the PBCH data generated in the first step, after matching a descrambling rate, selecting whether to adopt a merge algorithm or not according to a condition, and then carrying out channel decoding and CRC (cyclic redundancy check), judging whether to continuously receive the data of a next wireless frame or not according to a CRC result, and determining the system frame number according to the adopted scrambling sequence. The device comprises a receiving module (10), a signal processing module (20) and an adjudicating module (30). The invention can improve the efficiency of a terminal in the blind check of the PBCH, decreases power consumption, and determines the system frame number as quickly as possible, so as to be convenient to the read of a subsequent system message.
Description
Technical field
The present invention relates to field of wireless communication, method and device that the System Frame Number of particularly a kind of Long Term Evolution LTE system detects.
Background technology
Increase demand to the data business day by day in order to satisfy people, (The 3 for third generation partner program
RdGeneration Partnership Project, abbreviation 3GPP) started 3GPP " Long Term Evolution project ", be called for short 3GPP LTE (Long Term Evolution), this project is intended to the 3G (Third Generation) Moblie 3G system by continuous evolution, provide more powerful data service support, for the user provides better service.
Among the 3GPP standard TS 36.211 definition LTE TDD system frame structure as shown in Figure 1, LTE FDD system frame structure is as shown in Figure 2.
LTE TDD system wireless frame length is 10ms, corresponding 307200Ts.Each radio frames further is divided into the field of two 5ms again, and each field comprises 5 1ms subframes.If system is 5ms in the up-downgoing transfer point cycle, then second subframe in each field is special subframe, and order comprises descending pilot frequency time slot (abbreviating DwPTS as), main protection (abbreviating GP as), uplink pilot time slot (abbreviating UpPTS as) at interval.Described DwPTS, GP, UpPTS are respectively applied for cell ID and up-downgoing protection interval and uplink synchronous are set up, provided to initial synchronisation.If system is 10ms in the up-downgoing transfer point cycle, then special subframe exists only in the first field in the radio frames.In each field, 5 subframes also comprise conventional subframe except that special subframe, comprise two 0.5ms time slots in each conventional subframe again.Each subframe label i=0～9 in the radio frames, each conventional subframe is had jurisdiction over the time slot label and is respectively 2i, 2i+1.Subframe 0,5, DwPTS are used for downlink transfer all the time, and conventional subframe that is right after behind the special subframe and UpPTS are used for uplink all the time.
LTE FDD system wireless frame length also is 10ms, corresponding 307200Ts.A radio frames comprises 20 time slots, and sequence number is 0 to 19, the long 0.5ms of each time slot.A subframe is made of two continuous time slot, and promptly subframe i comprises time slot 2i and 2i+1.10 subframes can be used for downlink transmission and also can be used for ul transmissions.The up-downgoing transmission is pressed frequency domain and is isolated.
No matter be at LTE TDD system frame structure, still in LTE FDD system frame structure, subframe # 0 always is used for downlink transfer, and Physical Broadcast Channel (Physical broadcast channel is called for short PBCH) only is mapped on the subframe # 0 of radio frames.A Transmission Time Interval (Transmission Time Interval, abbreviation TTI) PBCH data map is to the subframe # 0 of four continuous radio frames, and first radio frames of mapping must satisfy the condition of SFN mod 4=0, wherein, SFN represents System Frame Number, and mod represents the complementation computing.
In the LTE system, after terminal is finished cell initial search,, need first read system message in order to carry out the user data demodulation.Terminal is the Master Information Block of read system message (Master Information Block at first, MIB), because MIB transmits in PBCH, so by first demodulation PBCH, just can read MIB, and the acquisition system frame number SFN, understand system information block 1 (System Information BlockType1 is called for short SIB1) and other system message according to SFN then.Determining of system frame number SFN is most important to the deciphering of system messages such as SIB1.
System Frame Number is represented by 10bit in the LTE system, and wherein high 8bit dominance notice in MIB just can be known after reading MIB; And low 2bit is by the recessive notice of PBCH mapping, as shown in Figure 3.In a TTI, first radio frames of mapping PBCH represents that 00, the second radio frames represents that 01, the three radio frames represents 10, the 4th radio frames represents 11, passes through the low 2bit of the position determination system frame number SFN of wireless frame data in a TTI that received.
According to 3GPP standard TS 36.211 and TS 36.212 as can be known, Physical Broadcast Channel PBCH transmitting terminal signal processing flow, as shown in Figure 4:
1) the Master Information Block MIB of 24bit becomes 40bit after adding 16bit cyclic redundancy check (CRC) code CRC.
2) the 40bit data behind the additional CRC are through stinging the data that obtain 120bit after tail (Tail Biting) convolutional encoding.
3) the 120bit data after the chnnel coding if regular circulation prefix (CyclicPrefix is called for short CP) then obtains the data of 1920bit, if be expansion CP, then obtain the data of 1728bit through after the rate-matched.
4) the scrambler sequence C of a TTI of generation carries out scrambling to the PBCH transmission block then.
5), obtain 960symbol (conventional CP) or 864symbol (expansion CP) through after the QPSK modulation.
6) then through layer mapping and precoding processing.If number of transmit antennas is 1, then adopt layer mapping and pre-coding scheme based on the single antenna sending mode; If number of transmit antennas is 2 or 4, then adopt layer mapping and pre-coding scheme based on transmit diversity.
7) be mapped on the physical resource unit.Number of transmit antennas for 1,2 or 4 is used identical physical resource mapping mode, promptly no matter how many number of transmit antennas is, always vacate the pilot resources of 4 antennas; In addition, the PBCH data map of a TTI is on four continuous radio frames, and first radio frames of mapping must satisfy the condition of SFN mod 4=0, preceding 4 OFDM symbols of the slot# 1 of each radio frames (the 1.08MHz bandwidth at a band occupancy center (72 subcarriers)) are used to shine upon the PBCH data, as shown in Figure 3.
8) modulate to generate the PBCH baseband signal through OFDM at last.
According to foregoing description as can be known,, not only need correctly to detect PBCH, with the high 8bit of acquisition SFN, but also need the definite position of wireless frame data in a TTI that be received, to obtain the low 2bit of SFN in order to determine system frame number SFN.Usually terminal receives the PBCH data of a complete TTI, and the signal processing of employing and transmitting terminal contrary, carries out the detection of PBCH, and with definite System Frame Number, but the efficient that this method is handled is lower, complexity is higher and power consumption of terminal is bigger.
Summary of the invention
The technical problem that the present invention solves has been to propose the System Frame Number detection method of a kind of Long Term Evolution LTE system, detect PBCH by a radio frames or the merging of a plurality of radio frames, determine System Frame Number, thereby reduce the implementation complexity and the power consumption of terminal, and determine System Frame Number as early as possible, so that the reading of follow-up system message.
For overcoming the above problems, the present invention proposes the System Frame Number detection method of a kind of Long Term Evolution LTE system, as shown in Figure 5, comprising:
Steps A: terminal receives the time-domain signal of first subframe on the radio frames, adopts the signal processing with the transmitting terminal contrary, obtains treating the Physical Broadcast Channel PBCH data A of descrambling;
Step B: produce the scrambler sequence C of a time interval TTI, scrambler sequence C is divided into 4 sections, every segment length equals the length of data A, and data A is carried out descrambling with 4 sections scrambler sequence successively, obtains data behind 4 parts of descramblings respectively.
Step C: the data behind 4 parts of descramblings are done separated rate-matched respectively, preserve and separate the rate-matched dateout;
Step D: the data that will separate after the rate-matched are done channel decoding;
Step e: the channel decoding dateout is done the cyclic redundancy CRC check, if there is any CRC check correct, then obtain System Frame Number, flow process finishes; Otherwise, go back to steps A, repeat above process till arbitrary CRC check is correct.
Preferably, as a kind of improvement execution mode, described step C preserve separate the rate-matched dateout after, judge whether to receiving for the first time the PBCH data, if, direct execution in step D then; Otherwise the rate-matched dateout of separating of preserving with the last time merges back execution in step D.
Preferably, improve execution mode as another kind, if all CRC check of described step e are all failed, then judge whether to receiving for the first time the PBCH data, if, then forward steps A to, otherwise the rate-matched dateout of separating that the rate-matched dateout preserves with the last time respectively of separating that step C is preserved merges back execution in step D.
Rate-matched output the separate rate-matched output corresponding with first section scrambler sequence of preserving last time of separating that described data are merged into second section scrambler sequence correspondence of this preservation merges, rate-matched output the separate rate-matched corresponding with second section scrambler sequence of preserving last time of separating of the 3rd section scrambler sequence correspondence of this preservation exported and merged, rate-matched output the separate rate-matched output corresponding with the 3rd section scrambler sequence of preserving last time of separating of the 4th section scrambler sequence correspondence of this preservation is merged, and the rate-matched output of separating of first section scrambler sequence correspondence of this preservation does not participate in merging; Addition after the two segment data contraposition weightings.
The coefficient of described weighting depends on the merging mode, and the merging mode adopts merging or equal gain combining or the high specific merging mode etc. selected.
For overcoming the above problems, the present invention also provides the System Frame Number checkout gear of a kind of LTE system, comprising:
Receiver module 10 is used for receiving first the time-domain signal of first subframe on the radio frames, perhaps receives the time-domain signal of first subframe on the radio frames again according to the judgement indication of judging module 30;
Signal processing module 20, time-domain signal according to first subframe on the radio frames of receiver module 10 outputs, finish PBCH receiving end signal handling process, further comprise removal CP unit 201, OFDM demodulating unit 202, separate resource map unit 203, channel estimating unit 204, detecting signal unit 205 and QPSK demodulating unit 206, scrambler generation and descrambling unit 207, separate rate-matched unit 208, channel decoding unit 209 and CRC check unit 210;
Described signal processing module 20 further comprises:
PBCH counting unit 220, the PBCH counting also judges whether to receiving for the first time the PBCH data;
Data merge cells 230 adopts and selects merging or modes such as equal gain combining or high specific merging to merge separating the rate-matched dateout;
Data merge cells 230 determines whether work according to PBCH counting unit 220 judged results, if being judged as, PBCH counting unit 220 receives the PBCH data for the first time, then data merge cells 230 is not worked, data are directly passed to channel decoding unit 209, otherwise data pass to channel decoding unit 209 after data merge cells 230 is handled.
Judging module 30, CRC check result according to signal processing module 20 judges whether to finish, if described CRC check unit judges has any CRC check correct, then the high 8bit of System Frame Number obtains from MIB, the sequence number of the scrambler sequence that low 2bit adopts from step B obtains, thereby obtains System Frame Number; Otherwise indication receiver module 10 receives the time-domain signal of first subframe on the radio frames again.
The present invention utilizes the self-demarking code characteristic of the PBCH data of a radio frames, and the scrambler sequence C of a TTI is divided into 4 sections, and the PBCH data that generate with the first step are respectively carried out descrambling.Through after separating rate-matched, according to circumstances select whether adopt merge algorithm, pass through channel decoding and CRC check again, judge whether that according to the CRC check result needs continue to receive next wireless frame data, and determine System Frame Number according to the scrambler sequence that adopts.Compared with prior art, System Frame Number detection method provided by the invention has following beneficial effect:
1) efficient of raising terminal blind check PBCH reduces power consumption
Though the PBCH data map of a TTI is transmitted on 4 continuous radio frames, but the present invention has utilized the self-demarking code characteristic of radio frames PBCH data, 4 sections corresponding with 4 radio frames among the TTI successively scrambler sequence of the PBCH data of promptly utilizing a radio frames are carried out descrambling, thereby avoid receiving the PBCH data of a complete TTI and detecting.Realized the correct PBCH of detection data in the shortest time, and definite System Frame Number.Even under the situation that channel circumstance worsens, also can merge mode by the PBCH data of a plurality of radio frames, be implemented in the correct PBCH of detection data in the short time.
2) the merge algorithm universality is strong
At transmitting terminal, first radio frames of the PBCH data map of a TTI must satisfy SFN mod 4=0 condition, and the PBCH data transformation is identical between two TTI.When terminal receives data, can not guarantee it is that first radio frames from TTI begins to receive.Terminal might be that from TTI second, the 3rd or the 4th radio frames begin to receive the PBCH data.No matter which radio frames of terminal from TTI begins to receive the PBCH data, can both utilize merge algorithm that the present invention proposes that itself and the data that receive are later merged, to reach the purpose of correct detection.
Description of drawings
Fig. 1 is a prior art LTE system TDD mode frame structure;
Fig. 2 is the prior art LTE FDD of a system mode frame structure;
Fig. 3 is the running time-frequency resource mapping graph of prior art PBCH;
Fig. 4 is a prior art PBCH transmitting terminal signal processing flow;
Fig. 5 is the System Frame Number detection method flow chart of LTE of the present invention system;
Fig. 6 is System Frame Number detection method preferred implementation one flow chart of LTE of the present invention system;
Fig. 7 is System Frame Number detection method preferred implementation two flow charts of LTE of the present invention system;
Fig. 8 is a consolidation strategy key diagram of the present invention;
Fig. 9 is the System Frame Number checkout gear structure chart of LTE of the present invention system;
Figure 10 is the System Frame Number checkout gear signal processing module structure chart of LTE of the present invention system;
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and the embodiments, System Frame Number detection method and device to a kind of Long Term Evolution LTE of the present invention system are described in further detail, known implementation no longer describes in detail, to avoid there be unnecessary obscuring with content of the present invention.
The System Frame Number detection method of a kind of Long Term Evolution LTE of the present invention system has numerous embodiments, is described below respectively.
Execution mode 1: single radio frames detection system frame number scheme, flow process as shown in Figure 6, concrete steps comprise:
101) terminal receives the time-domain signal of first subframe on the radio frames.Time-domain signal is removed CP, and through the OFDM demodulation, then 72 subcarriers in center of preceding 4 OFDM symbols of slot# 1 are PBCH data and corresponding reference signal on this subframe.Through separating Resource Unit mapping, channel estimating, input and QPSK demodulation step, obtain treating the data A of descrambling then.For conventional CP, the length of data A is 480; For expansion CP, the length of data A is 432;
102) the scrambler sequence C of a TTI of generation, for conventional CP, the length of scrambler sequence C is 1920; For expansion CP, the length of scrambler sequence C is 1728.Scrambler sequence C is divided into 4 sections, is designated C1 respectively, C2, C3 and C4.Every segment length all equals the length of data A.The data A that step 101 is obtained carries out descrambling with 4 sections scrambler sequence successively then, obtains data D1 behind the descrambling respectively, D2, D3 and D4;
The scrambler sequence C of a TTI of described generation promptly generates the identical scrambler sequence of scrambler sequence C with a TTI of transmitting terminal, and the generation method is to make the scrambler sequence initial value
The expression Cell Identity CI generates scrambler sequence C with reference to 7.2 joints among the 3GPP standard TS 36.211 then.
103) respectively with the data D1 behind the descrambling, D2, D3 and D4 do and separate rate-matched, preserve and separate the rate-matched dateout;
104) data that will separate after the rate-matched are done channel decoding;
105) data after the channel decoding are done CRC check, if there is any CRC check correct, then the high 8bit of System Frame Number obtains from MIB, the sequence number of the scrambler sequence that low 2bit adopts from step 102 obtains, thereby obtain System Frame Number, otherwise rebound step 101 repeats above process till arbitrary CRC check is correct;
Verification sequence is obtained by CRC check bit and the scrambling of CRC mask in the described CRC check step.Wherein, the CRC check bit is with reference to 5.1.1 joint among the 3GPP standard TS 36.212, and the CRC mask is with reference to showing 5.3.1.1-1 among the 3GPP standard TS 36.211.
The sequence number of the scrambler sequence that described low 2bit adopts from step 102 obtains, and under the correct prerequisite of CRC check, if the scrambler sequence that adopts in the 2nd step is C1, then to go out the low 2bit of System Frame Number of the radio frames of up-to-date reception be 00 in deducibility; If the scrambler sequence that adopts is C2, then the low 2bit of System Frame Number is 01; If the scrambler sequence that adopts is C3, then the low 2bit of System Frame Number is 10; If the scrambler sequence that adopts is C4, then the low 2bit of System Frame Number is 11;
Execution mode 2: adopt a plurality of radio frames to merge detection system frame number schemes, flow process as shown in Figure 7, concrete steps comprise:
201) terminal receives the time-domain signal of first subframe on the radio frames.Time-domain signal is removed CP, and through the OFDM demodulation, then 72 subcarriers in center of preceding 4 OFDM symbols of slot# 1 are PBCH data and corresponding reference signal on this subframe.Through separating Resource Unit mapping, channel estimating, input and QPSK demodulation step, obtain treating the data A of descrambling then.For conventional CP, the length of data A is 480; For expansion CP, the length of data A is 432;
202) the scrambler sequence C of a TTI of generation, for conventional CP, the length of scrambler sequence C is 1920; For expansion CP, the length of scrambler sequence C is 1728.Scrambler sequence C is divided into 4 sections, is designated C1 respectively, C2, C3 and C4.Every segment length all equals the length of data A.The data A that step 201 is obtained carries out descrambling with 4 sections scrambler sequence successively then, obtains data D1 behind the descrambling respectively, D2, D3 and D4;
203) respectively with the D1 behind the descrambling, D2, D3 and D4 data are through separating the rate-matched step, and obtain and preserve and separate rate-matched dateout E1, E2, E3 and E4, and judge whether to receiving for the first time the PBCH data, if, direct execution in step 204 then; Otherwise, then need to merge with the last rate-matched dateout of separating of preserving, and then execution in step 204;
The described rate-matched dateout of separating with this preservation merges with the last rate-matched dateout of separating of preserving, as shown in Figure 8.Separate rate-matched dateout E1 described in the step 203, E2, E3 and E4 respectively with first section scrambler sequence corresponding separate rate-matched output, second section scrambler sequence corresponding separate rate-matched output, the 3rd section scrambler sequence corresponding separate rate-matched output and the 4th section scrambler sequence corresponding to separate rate-matched output corresponding.During merging, always rate-matched output the separate rate-matched corresponding with first section scrambler sequence of preserving last time of separating of second section scrambler sequence correspondence of this preservation exported and merged, rate-matched output the separate rate-matched corresponding with second section scrambler sequence of preserving last time of separating of the 3rd section scrambler sequence correspondence of this preservation exported and merged, rate-matched output the separate rate-matched output corresponding with the 3rd section scrambler sequence of preserving last time of separating of the 4th section scrambler sequence correspondence of this preservation is merged, and the rate-matched output of separating of first section scrambler sequence correspondence of this preservation does not participate in merging; Addition after the two segment data contraposition weightings;
The coefficient of described weighting depends on the merging mode, and the merging mode can be enumerated no longer one by one for selecting merging or equal gain combining or high specific merging etc.Modes such as described selection merging or equal gain combining or high specific merging are conventionally known to one of skill in the art, therefore, no longer describe in detail.
204) will separate rate-matched dateout E1, E2, E3 and E4 are through channel decoding;
205) data after the channel decoding are done CRC check, if there is any CRC check correct, then the high 8bit of System Frame Number obtains from MIB, and the sequence number of the scrambler sequence that low 2bit adopts from step 202 obtains, thereby obtains System Frame Number, and flow process finishes; Otherwise, rebound step 201 then.Till CRC check is correct.
Execution mode 3: single radio frames merges with many radio frames and mixes detection system frame number scheme, and the specific implementation step comprises:
301) terminal receives the time-domain signal of first subframe on the radio frames.Time-domain signal is removed CP, and through the OFDM demodulation, then 72 subcarriers in center of preceding 4 OFDM symbols of slot# 1 are PBCH data and corresponding reference signal on this subframe.Through separating Resource Unit mapping, channel estimating, input and QPSK demodulation step, obtain treating the data A of descrambling then.For conventional CP, the length of data A is 480; For expansion CP, the length of data A is 432;
302) the scrambler sequence C of a TTI of generation, for conventional CP, the length of scrambler sequence C is 1920; For expansion CP, the length of scrambler sequence C is 1728.Scrambler sequence C is divided into 4 sections, is designated C1 respectively, C2, C3 and C4.Every segment length all equals the length of data A.The data A that step 301 is obtained carries out descrambling with 4 sections scrambler sequence successively then, obtains data D1 behind the descrambling respectively, D2, D3 and D4;
303) respectively with the D1 behind the descrambling, D2, D3 and D4 data are through separating the rate-matched step, obtain and preserve and separate rate-matched dateout E1, E2, E3 and E4;
304) will separate the rate-matched dateout through channel decoding;
305) data after the channel decoding are done CRC check, if there is any CRC check correct, then the high 8bit of System Frame Number obtains from MIB, and the sequence number of the scrambler sequence that low 2bit adopts from step 302 obtains, thereby obtains System Frame Number, and flow process finishes; Otherwise continue execution in step 306;
306) judge whether to receiving for the first time the PBCH data, if, rebound step 301 then; Otherwise that then step 303 is preserved separates rate-matched dateout E1, and the rate-matched dateout of separating that E2, E3 and E4 preserve with the last time respectively merges, and obtains e1, e2, e3 and e4;
307) the data e1 after will merging, e2, e3 and e4 pass through channel decoding respectively;
308) data after the channel decoding are done CRC check, if there is any CRC check correct, then the high 8bit of System Frame Number obtains from MIB, and the sequence number of the scrambler sequence that low 2bit adopts from step 302 obtains, thereby obtains System Frame Number.Otherwise rebound step 301 is till having any CRC check correct.
In order to realize above purpose, the present invention also provides the System Frame Number checkout gear of a kind of LTE system, as shown in Figure 9.The System Frame Number checkout gear of LTE of the present invention system comprises:
Receiver module 10 is used for receiving first the time-domain signal of first subframe on the radio frames, perhaps receives the time-domain signal of first subframe on the radio frames again according to the judgement indication of judging module 30.
Signal processing module 20, time-domain signal according to first subframe on the radio frames of receiver module 10 outputs, finish PBCH receiving end signal handling process, further comprise removal CP unit 201, OFDM demodulating unit 202, separate resource map unit 203, channel estimating unit 204, detecting signal unit 205 and QPSK demodulating unit 206, scrambler generation and descrambling unit 207, separate rate-matched unit 208, channel decoding unit 209 and CRC check unit 210, as shown in figure 10.
Preferably, described signal processing module 20 further comprises:
PBCH counting unit 220, the PBCH counting also judges whether to receiving for the first time the PBCH data;
Data merge cells 230 adopts and selects merging or modes such as equal gain combining or high specific merging to merge separating the rate-matched dateout;
Data merge cells 230 determines whether work according to PBCH counting unit 220 judged results, if being judged as, PBCH counting unit 220 receives the PBCH data for the first time, then data merge cells 230 is not worked, data are directly passed to channel decoding unit 209, otherwise data pass to channel decoding unit 209 after data merge cells 230 is handled.
Judging module 30, CRC check result according to signal processing module 20 judges whether to finish, if described CRC check unit judges has any CRC check correct, then the high 8bit of System Frame Number obtains from MIB, the sequence number of the scrambler sequence that low 2bit adopts from step B obtains, thereby obtains System Frame Number; Otherwise indication receiver module 10 receives the time-domain signal of first subframe on the radio frames again.
The present invention has carried out further detailed description for execution mode or embodiment to the purpose, technical solutions and advantages of the present invention; institute is understood that; above only is preferred implementation of the present invention for execution mode or embodiment; not in order to restriction the present invention; all within the spirit and principles in the present invention to any modification that the present invention did, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. the System Frame Number detection method of a Long Term Evolution LTE system is characterized in that, comprising:
Steps A: terminal receives the time-domain signal of first subframe on the radio frames, adopts the signal processing with the transmitting terminal contrary, obtains treating the Physical Broadcast Channel PBCH data A of descrambling;
Step B: produce the scrambler sequence C of a time interval TTI, scrambler sequence C is divided into 4 sections, every segment length equals the length of data A, and data A is carried out descrambling with 4 sections scrambler sequence successively, obtains data behind 4 parts of descramblings respectively;
Step C: the data behind 4 parts of descramblings are done separated rate-matched respectively, preserve and separate the rate-matched dateout;
Step D: the data that will separate after the rate-matched are done channel decoding;
Step e: the channel decoding dateout is done the cyclic redundancy CRC check, if there is any CRC check correct, then obtain System Frame Number, flow process finishes; Otherwise, go back to steps A, repeat above process till arbitrary CRC check is correct.
2. the System Frame Number detection method of LTE system according to claim 1 is characterized in that, described step C preserve separate the rate-matched dateout after, judge whether to receiving for the first time the PBCH data, if, direct execution in step D then; Otherwise the rate-matched dateout of separating of preserving with the last time merges back execution in step D.
3. the System Frame Number detection method of LTE system according to claim 1, it is characterized in that, if all CRC check of described step e are all failed, then judge whether to receiving for the first time the PBCH data, if, then forward steps A to, otherwise the rate-matched dateout of separating that the rate-matched dateout preserves with the last time respectively of separating that step C is preserved merges back execution in step D.
4. as the System Frame Number detection method of LTE system as described in claim 2 or 3, it is characterized in that, rate-matched output the separate rate-matched output corresponding with first section scrambler sequence of preserving last time of separating that described data are merged into second section scrambler sequence correspondence of this preservation merges, rate-matched output the separate rate-matched output corresponding with second section scrambler sequence of preserving last time of separating of the 3rd section scrambler sequence correspondence of this preservation is merged, rate-matched output the separate rate-matched corresponding with the 3rd section scrambler sequence of preservation last time of separating of the 4th section scrambler sequence correspondence of this preservation exported and merged; Addition after the two segment data contraposition weightings.
5. as the System Frame Number detection method of LTE system as described in the claim 4, it is characterized in that the coefficient of described weighting depends on the merging mode, the merging mode adopts selects merging or equal gain combining or high specific to merge mode.
6. the System Frame Number checkout gear of a Long Term Evolution LTE system is characterized in that, comprising:
Receiver module (10) is used for receiving first the time-domain signal of first subframe on the radio frames, perhaps receives the time-domain signal of first subframe on the radio frames again according to the judgement indication of judging module (30);
Signal processing module (20), time-domain signal according to first subframe on the radio frames of receiver module (10) output, finish PBCH receiving end signal handling process, further comprise remove cyclic prefix CP unit (201), OFDM demodulating unit (202), separate resource map unit (203), channel estimating unit (204), detecting signal unit (205), QPSK demodulating unit (206), scrambler generates and descrambling unit (207), separate rate-matched unit (208), channel decoding unit (209) and CRC check unit (210);
Judging module (30), CRC check result according to signal processing module (20) judges whether to finish, if described CRC check unit judges has any CRC check correct, then the high 8bit of System Frame Number obtains from MIB, low 2bit obtains from the sequence number of the scrambler sequence of employing, thereby obtains System Frame Number; Otherwise indication receiver module (10) receives the time-domain signal of first subframe on the radio frames again.
7. as the System Frame Number checkout gear of LTE system as described in the claim 6, it is characterized in that described signal processing module (20) further comprises:
PBCH counting unit (220), the PBCH counting also judges whether to receiving for the first time the PBCH data;
Data merge cells (230) adopts and selects merging or equal gain combining or high specific merging mode to merge separating the rate-matched dateout;
Data merge cells (230) determines whether work according to PBCH counting unit (220) judged result, if being judged as, PBCH counting unit (220) receives the PBCH data for the first time, then data merge cells (230) is not worked, data are directly passed to channel decoding unit (209), otherwise data pass to channel decoding unit (209) after data merge cells (230) is handled.
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