CN105530072A - Uplink signal decoding method based on code block segmentation and base station - Google Patents
Uplink signal decoding method based on code block segmentation and base station Download PDFInfo
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Abstract
The invention discloses an uplink signal decoding method based on code block segmentation and a base station. The method comprises steps that signal processing on a received uplink signal is carried out to acquire a symbol sequence; symbol level processing on the symbol sequence is carried out to acquire the symbol sequence after symbol level processing; segmentation processing on the symbol sequence after symbol level processing is carried out to acquire a code block set; demodulation processing on the code block set is carried out to acquire a demodulated code block set; descrambling processing on the demodulated code block set is carried out to acquire a descrambled code block set; bit level processing on the descrambled code block set is carried out to acquire the user data sent by a terminal. According to the uplink signal decoding method based on code block segmentation and the base station, scrambling and modulation processing is on the basis of the code block not the whole transmission block length, so processing amount of an LTE system is reduced.
Description
Technical field
The present invention relates to communication technical field, be specifically related to a kind of upward signal coding/decoding method based on code block segmentation and base station.
Background technology
Current LTE (LongTermEvolution, Long Term Evolution) in system, up enhancement mode multi-antenna technology is introduced in up link, based on 4 transmitting antenna precodings, maximumly support 4 sheaf space multiplexing transmission modes, in this case for maximum support 64QAM (QuadratureAmplitudeModulation, quadrature amplitude modulation) modulation system, corresponding transmission block bit number adds a lot, and base station receives treating capacity to be increased greatly.
The process of the bit-level of LTE system generally adopts Turbo to encode, and the maximum input bit length of Turbo code is for being defined as 6144 bits.The situation of 6144 bits is greater than owing to there is transmission block bit number, therefore have employed code block segmentation technology in LTE system, namely by calculating the code block number that " transmission block bit number/6144 " obtain splitting, based on code block number, code block segmentation is carried out to transmission block, bit number in each code block after segmentation is less than or equal to 6144 bits, for the process of Turbo coding and decoding.
Fig. 1 is that the upward signal of the PUSCH (PhysicalUplinkSharedChannel, Physical Uplink Shared Channel) of LTE system receives FB(flow block).Wherein, through the process such as channel estimating, detection, carry out disturbing process based on the demodulation of the whole transmission block of code block tandem states to receiving symbol, carry out the relevant deinterleaving of code block segmentation process afterwards and conciliate multiplexing process, the data of each code block after segmentation carry out rate de-matching, HARQ (HybridAutomaticRepeatRequest, hybrid automatic repeat-request) process such as soft merging, channel-decoding, code block CRC (CyclicRedundancyCheck, cyclic redundancy check (CRC)) error detection.Finally all code blocks are carried out code block cascade process, export transmission block bit through transmission block CRC error detection.
In LTE system, the code block process of existing upward signal receiving terminal is only carried out in bit-level, and descrambling, demodulation process based on whole transport block length, due to corresponding TBS (TransportBlockSize, transmission block size) bit value adds, for large transmission block, its treating capacity will increase greatly.Such as, for the treated length of scrambling/descrambling, in 64QAM modulation system situation, due to the increase of TBS bit number, the treating capacity of descrambling increases a lot than treating capacity during QPSK (QuadraturePhaseShiftKeying, Quadrature Phase Shift Keying) and 16QAM.For the process of demodulation, because symbol-modulated bit wide during 64QAM is 6 bits, compared with symbol-modulated during 16QAM, the treating capacity of its demodulation is 1.5 times of original treating capacity.
Because the process of existing descrambling and demodulation processes based on whole transport block length, along with LTE system configuration complicated, the treating capacity of descrambling and demodulation progressively increases, and is unfavorable for the real-time process of LTE system.
Summary of the invention
Technical problem to be solved by this invention is that the process of existing descrambling and demodulation processes based on whole transport block length, along with LTE system configuration complicated, the treating capacity of descrambling and demodulation progressively increases, and is unfavorable for the real-time process of LTE system.
For this purpose, first aspect, the present invention proposes a kind of upward signal coding/decoding method based on code block segmentation, and described method comprises:
Signal transacting is carried out to the upward signal received, obtains symbol sebolic addressing;
Symbol level process is carried out to described symbol sebolic addressing, obtains the symbol sebolic addressing through symbol level process;
Dividing processing is carried out to the described symbol sebolic addressing through symbol level process, obtains code block group;
Demodulation process is carried out to described code block group, obtains the code block group after demodulation;
Scramble process is carried out to the code block group after described demodulation, obtains the code block group after descrambling;
Bit-level process is carried out to the code block group after described descrambling, obtains the user data that terminal sends.
Optionally, the described upward signal to receiving carries out signal transacting, obtains symbol sebolic addressing, comprising:
Channel estimating, detection are carried out to the upward signal received, obtain symbol sebolic addressing to be demodulated, described symbol sebolic addressing to be demodulated comprises data symbol and control character, and described control character indicates RI symbol and response ACK symbol to form by channel quality indicator (CQI) symbol, order.
Optionally, described symbol level process is carried out to described symbol sebolic addressing, comprising:
Deinterleaving process is carried out to described symbol sebolic addressing to be demodulated, obtains the symbol sebolic addressing after deinterleaving;
Demultiplexing process is carried out to the symbol sebolic addressing after described deinterleaving, obtains the symbol sebolic addressing after demultiplexing.
Optionally, described deinterleaving process is carried out to described symbol sebolic addressing to be demodulated, obtains the symbol sebolic addressing after deinterleaving, comprising:
According to preset rules, carry out deinterleaving process to symbol sebolic addressing to be demodulated, obtain the symbol sebolic addressing after deinterleaving, the symbol sebolic addressing after described deinterleaving comprises data symbol and control character, and described control character is made up of CQI symbol, RI symbol and ACK symbol.
Optionally, described demultiplexing process is carried out to the symbol sebolic addressing after described deinterleaving, obtains the symbol sebolic addressing after demultiplexing, comprising:
Described CQI symbol, RI symbol taken out from the symbol sebolic addressing after deinterleaving and is cached in default CQI buffer memory and RI buffer memory respectively, to the position not zero padding vacated in the symbol sebolic addressing after deinterleaving, obtaining the first symbol sebolic addressing;
Taken out from described first symbol sebolic addressing by described ACK symbol and be cached in default ACK buffer memory, to the position zero padding vacated in the first symbol sebolic addressing, obtaining the second symbol sebolic addressing, described second symbol sebolic addressing is the symbol sebolic addressing after demultiplexing.
Optionally, described dividing processing is carried out to the described symbol sebolic addressing through symbol level process, obtains code block group, comprising:
According to the value of the transmission block size TBS preset, the maximum input bit number of modulation mapped bits number Q and Turbo coding, calculate code block segmentation number C;
Symbol sebolic addressing after described demultiplexing is divided into C code block, a described C code block forms code block group according to the arrangement of segmentation order.
Optionally, described the step of scramble process is carried out to the code block group after described demodulation before, described method also comprises:
The bit sequence length corresponding according to described symbol sebolic addressing to be demodulated, generates the scrambled bits sequence of corresponding length;
Deinterleaving process is carried out to described scrambled bits sequence, obtains the scrambler sequence after also buffer memory deinterleaving;
Correspondingly, described scramble process is carried out to the code block group after described demodulation, obtains the code block group after descrambling, comprising:
Position according to CQI symbol and RI symbol in the symbol sebolic addressing after deinterleaving, removes the bit of relevant position in the scrambler sequence after described deinterleaving, obtains the first scrambler sequence;
According to the position in the symbol sebolic addressing of ACK symbol after described deinterleaving, the bit of relevant position in described first scrambler sequence is removed and zero padding, obtain the second scrambler sequence;
According to the several C of code block segmentation, described second scrambler sequence is divided into the C corresponding with the code block in code block group scrambler subsequence;
According to described C scrambler subsequence, in code-aiming block group, the bit sequence of C code block carries out scramble process.
Optionally, described bit-level process is carried out to the code block group after described descrambling, obtains the user data that terminal sends, comprising:
Rate de-matching, the soft merging of hybrid automatic repeat-request HARQ, channel decoding and code block cyclic redundancy check (CRC) error detection process are carried out to each code block in the code block group after described descrambling;
Each code block in code block group is carried out bit-level code block cascade process, obtain transmission block, to the user data obtaining terminal transmission after transmission block CRC error detection.
Second aspect, the present invention also proposes a kind of base station, and described base station comprises:
Signal processing unit, for carrying out signal transacting to the upward signal received, obtains symbol sebolic addressing;
Symbol level processing unit, for carrying out symbol level process to described symbol sebolic addressing, obtains the symbol sebolic addressing through symbol level process;
Dividing processing unit, for carrying out dividing processing to the described symbol sebolic addressing through symbol level process, obtains code block group;
Demodulation process unit, for carrying out demodulation process to described code block group, obtains the code block group after demodulation;
Scramble process unit, for carrying out scramble process to the code block group after described demodulation, obtains the code block group after descrambling;
Bit-level processing unit, for carrying out bit-level process to the code block group after described descrambling, obtains the user data that terminal sends, and completes upward signal and receives.
Optionally, described signal processing unit, specifically for:
Channel estimating, detection are carried out to the upward signal received, obtain symbol sebolic addressing to be demodulated, described symbol sebolic addressing to be demodulated comprises data symbol and control character, and described control character indicates RI symbol and response ACK symbol to form by channel quality indicator (CQI) symbol, order.
Compared to prior art, a kind of upward signal coding/decoding method based on code block segmentation that the present invention proposes and base station by by the process of descrambling and demodulation based on code block but not whole transport block length, thus reduce the treating capacity of LTE system.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 shows the upward signal decoding process block diagram of the PUSCH channel of existing LTE system;
Fig. 2 shows the upward signal coding/decoding method flow chart based on code block segmentation;
Fig. 3 shows the upward signal coding/decoding method flow chart based on code block segmentation;
Fig. 4 shows the architecture of base station figure of application based on the upward signal coding/decoding method of code block segmentation.
Embodiment
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
The upward signal coding/decoding method flow chart based on code block segmentation as shown in Figures 2 and 3, the present embodiment discloses a kind of upward signal coding/decoding method based on code block segmentation, and described method can comprise the following steps:
S1, signal transacting is carried out to the upward signal received, obtain symbol sebolic addressing;
In embody rule, to the terminal signaling by PUSCH transmission received, carry out the signal transacting such as channel estimating, detection, obtain symbol sebolic addressing to be demodulated, symbol sebolic addressing to be demodulated comprises data symbol and control character, and control signal is by CQI (Channelqualityindicator, channel quality indicates), RI (RankIndication, order indicates) and ACK (Acknowledge, response) composition.
S2, symbol level process is carried out to the symbol sebolic addressing in step S1, obtain the symbol sebolic addressing through symbol level process;
For example, symbol level process can comprise:
Symbol level deinterleaving process: according to preset rules, deinterleaving process is carried out to symbol sebolic addressing to be demodulated, obtain the symbol sebolic addressing after deinterleaving, symbol sebolic addressing after deinterleaving comprises data symbol and control character, wherein, control character is made up of CQI symbol, RI symbol and ACK symbol, and the position in the symbol sebolic addressing of control character after deinterleaving is known in advance.For example, preset rules can be default LTE system configuration, such as, and the length etc. of deinterleaving
Simultaneously, the correct order of scrambler sequence during in order to ensure descrambling, need first to generate scrambled bits sequence before descrambling, the length of scrambled bits sequence equals bit sequence length corresponding to symbol sebolic addressing to be demodulated, deinterleaving process is carried out to scrambled bits sequence, obtain the scrambler sequence after also buffer memory deinterleaving, for follow-up scramble process.
Symbol level demultiplexing process: carry out demultiplexing process to the symbol sebolic addressing after deinterleaving, obtains the symbol sebolic addressing after demultiplexing, specifically comprises the following steps:
CQI symbol, RI symbol taken out from the symbol sebolic addressing after deinterleaving and is cached in default CQI buffer memory and RI buffer memory respectively, to the position not zero padding vacated in the symbol sebolic addressing after deinterleaving, obtaining the first symbol sebolic addressing;
Taken out from the first symbol sebolic addressing by ACK symbol and be cached in default ACK buffer memory, to the position zero padding vacated in the first symbol sebolic addressing, obtain the second symbol sebolic addressing, the second symbol sebolic addressing is the symbol sebolic addressing after demultiplexing, does not comprise any control character.
S3, dividing processing is carried out to the described symbol sebolic addressing through symbol level process, obtain code block group;
Carry out dividing processing to symbol sebolic addressing also to carry out at symbol level, particularly:
First, the number C of code block segmentation is calculated:
According to the value (being K bit in the present embodiment) of transmission block size TBS in the LTE system configuration preset, the maximum input bit number 6144 of modulation mapped bits number Q and Turbo coding, calculate code block segmentation number C;
Wherein, Q=2,4,6, corresponding modulation system is QPSK, 16QAM, 64QAM.Corresponding modulation symbol number is M=K/Q, then
If M≤Z, the number C=1 of code block segmentation.
If M>Z, the number of code block segmentation
wherein Z=6144Q.
Second symbol sebolic addressing is divided into C code block, this C code block forms code block group according to the arrangement of segmentation order, and first code block is to the length of C-1 code block
the length of C code block is by remaining length after the second symbol sebolic addressing segmentation C-1 code block.
S4, demodulation process is carried out to described code block group, obtain the code block group after demodulation;
Particularly, this step is the demodulation process of carrying out in code block level:
Data symbol in code-aiming block group in each code block carries out demodulation process, the demodulation process that different modulating mode is corresponding different, and modulation system comprises QPSK, 16QAM, 64QAM, and modulation system can select QPSK, 16QAM or 64QAM according to LTE system configuration.
Accordingly, identical with the demodulation process of above-mentioned code block to the demodulation process of CQI symbol, and RI symbol and ACK symbol only carry out QPSK demodulation.
S5, scramble process is carried out to the code block group after described demodulation, obtain the code block group after descrambling; Particularly:
First, the position according to CQI symbol and RI symbol in the symbol sebolic addressing after deinterleaving, removes the bit of relevant position in the scrambler sequence after described deinterleaving, obtains the first scrambler sequence;
Secondly, according to the position in the symbol sebolic addressing of ACK symbol after described deinterleaving, the bit of relevant position in described first scrambler sequence is removed and zero padding, obtain the second scrambler sequence;
Again, according to the several C of code block segmentation, described second scrambler sequence is divided into the C corresponding with the code block in code block group scrambler subsequence;
Finally, according to described C scrambler subsequence, in code-aiming block group, the bit sequence of C code block carries out scramble process, obtains the code block group after descrambling.
S6, bit-level process is carried out to the code block group after described descrambling, obtain the user data that terminal sends.
For example, bit-level process can comprise: carry out rate de-matching, the soft merging of hybrid automatic repeat-request HARQ, channel decoding and code block cyclic redundancy check (CRC) error detection process to each code block in the code block group after described descrambling;
After above-mentioned bit-level process, each code block in code block group is carried out bit-level code block cascade process, obtain transmission block, to the user data obtaining terminal transmission after transmission block CRC error detection, complete upward signal and receive.
The upward signal coding/decoding method based on code block segmentation of the present embodiment by by the process of descrambling and demodulation based on code block but not whole transport block length, thus reduce the treating capacity of LTE system.The method of the present embodiment is applicable to the Parallel processing designs under hardware environment.
Application is as shown in Figure 4 based on the architecture of base station figure of the upward signal coding/decoding method of code block segmentation, and the present embodiment discloses a kind of base station, and described base station can comprise with lower unit:
Signal processing unit, for carrying out signal transacting to the upward signal received, obtains symbol sebolic addressing;
Symbol level processing unit, for carrying out symbol level process to described symbol sebolic addressing, obtains the symbol sebolic addressing through symbol level process;
Dividing processing unit, for carrying out dividing processing to the described symbol sebolic addressing through symbol level process, obtains code block group;
Demodulation process unit, for carrying out demodulation process to described code block group, obtains the code block group after demodulation;
Scramble process unit, for carrying out scramble process to the code block group after described demodulation, obtains the code block group after descrambling;
Bit-level processing unit, for carrying out bit-level process to the code block group after described descrambling, obtains the user data that terminal sends, and completes upward signal and receives.
The base station of above-described embodiment can perform the flow process in aforesaid embodiment of the method, and the present embodiment does not describe in detail at this.
The application of the present embodiment based on the upward signal coding/decoding method of code block segmentation base station by by the process of descrambling and demodulation based on code block but not whole transport block length, thus reduce the treating capacity of LTE system.Each unit in the base station of the present embodiment is applicable to the Parallel processing designs under hardware environment.
It will be understood by those skilled in the art that adaptively to change the unit in embodiment and they are arranged and be in one or more equipment that this embodiment is different.Unit combination in embodiment can be become a module or unit or assembly, and multiple submodule or subelement or sub-component can be put them in addition.Except at least some in such feature and/or process or unit is mutually exclusive part, any combination can be adopted to combine all processes of features all disclosed in this specification and so disclosed any method or equipment or unit.Unless expressly stated otherwise, each feature disclosed in this specification can by providing identical, alternative features that is equivalent or similar object replaces.
In addition, those skilled in the art can understand, although embodiments more described herein to comprise in other embodiment some included feature instead of further feature, the combination of the feature of different embodiment means and to be within scope of the present invention and to form different embodiments.
Although describe embodiments of the present invention by reference to the accompanying drawings, but those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, such amendment and modification all fall into by within claims limited range.
Claims (10)
1. based on a upward signal coding/decoding method for code block segmentation, it is characterized in that, described method comprises:
Signal transacting is carried out to the upward signal received, obtains symbol sebolic addressing;
Symbol level process is carried out to described symbol sebolic addressing, obtains the symbol sebolic addressing through symbol level process;
Dividing processing is carried out to the described symbol sebolic addressing through symbol level process, obtains code block group;
Demodulation process is carried out to described code block group, obtains the code block group after demodulation;
Scramble process is carried out to the code block group after described demodulation, obtains the code block group after descrambling;
Bit-level process is carried out to the code block group after described descrambling, obtains the user data that terminal sends.
2. method according to claim 1, is characterized in that, the described upward signal to receiving carries out signal transacting, obtains symbol sebolic addressing, comprising:
Channel estimating, detection are carried out to the upward signal received, obtain symbol sebolic addressing to be demodulated, described symbol sebolic addressing to be demodulated comprises data symbol and control character, and described control character indicates RI symbol and response ACK symbol to form by channel quality indicator (CQI) symbol, order.
3. method according to claim 2, is characterized in that, describedly carries out symbol level process to described symbol sebolic addressing, comprising:
Deinterleaving process is carried out to described symbol sebolic addressing to be demodulated, obtains the symbol sebolic addressing after deinterleaving;
Demultiplexing process is carried out to the symbol sebolic addressing after described deinterleaving, obtains the symbol sebolic addressing after demultiplexing.
4. method according to claim 3, is characterized in that, describedly carries out deinterleaving process to described symbol sebolic addressing to be demodulated, obtains the symbol sebolic addressing after deinterleaving, comprising:
According to preset rules, carry out deinterleaving process to symbol sebolic addressing to be demodulated, obtain the symbol sebolic addressing after deinterleaving, the symbol sebolic addressing after described deinterleaving comprises data symbol and control character, and described control character is made up of CQI symbol, RI symbol and ACK symbol.
5. method according to claim 4, is characterized in that, describedly carries out demultiplexing process to the symbol sebolic addressing after described deinterleaving, obtains the symbol sebolic addressing after demultiplexing, comprising:
Described CQI symbol, RI symbol taken out from the symbol sebolic addressing after deinterleaving and is cached in default CQI buffer memory and RI buffer memory respectively, to the position not zero padding vacated in the symbol sebolic addressing after deinterleaving, obtaining the first symbol sebolic addressing;
Taken out from described first symbol sebolic addressing by described ACK symbol and be cached in default ACK buffer memory, to the position zero padding vacated in the first symbol sebolic addressing, obtaining the second symbol sebolic addressing, described second symbol sebolic addressing is the symbol sebolic addressing after demultiplexing.
6. method according to claim 5, is characterized in that, describedly carries out dividing processing to the described symbol sebolic addressing through symbol level process, obtains code block group, comprising:
According to the value of the transmission block size TBS preset, the maximum input bit number of modulation mapped bits number Q and Turbo coding, calculate code block segmentation number C;
Symbol sebolic addressing after described demultiplexing is divided into C code block, a described C code block forms code block group according to the arrangement of segmentation order.
7. method according to claim 6, is further characterized in that, described the step of scramble process is carried out to the code block group after described demodulation before, described method also comprises:
The bit sequence length corresponding according to described symbol sebolic addressing to be demodulated, generates the scrambled bits sequence of corresponding length;
Deinterleaving process is carried out to described scrambled bits sequence, obtains the scrambler sequence after also buffer memory deinterleaving;
Correspondingly, described scramble process is carried out to the code block group after described demodulation, obtains the code block group after descrambling, comprising:
Position according to CQI symbol and RI symbol in the symbol sebolic addressing after deinterleaving, removes the bit of relevant position in the scrambler sequence after described deinterleaving, obtains the first scrambler sequence;
According to the position in the symbol sebolic addressing of ACK symbol after described deinterleaving, the bit of relevant position in described first scrambler sequence is removed and zero padding, obtain the second scrambler sequence;
According to the several C of code block segmentation, described second scrambler sequence is divided into the C corresponding with the code block in code block group scrambler subsequence;
According to described C scrambler subsequence, in code-aiming block group, the bit sequence of C code block carries out scramble process.
8. method according to claim 1, is characterized in that, describedly carries out bit-level process to the code block group after described descrambling, obtains the user data that terminal sends, comprising:
Rate de-matching, the soft merging of hybrid automatic repeat-request HARQ, channel decoding and code block cyclic redundancy check (CRC) error detection process are carried out to each code block in the code block group after described descrambling;
Each code block in code block group is carried out bit-level code block cascade process, obtain transmission block, to the user data obtaining terminal transmission after transmission block CRC error detection.
9. a base station, is characterized in that, described base station comprises:
Signal processing unit, for carrying out signal transacting to the upward signal received, obtains symbol sebolic addressing;
Symbol level processing unit, for carrying out symbol level process to described symbol sebolic addressing, obtains the symbol sebolic addressing through symbol level process;
Dividing processing unit, for carrying out dividing processing to the described symbol sebolic addressing through symbol level process, obtains code block group;
Demodulation process unit, for carrying out demodulation process to described code block group, obtains the code block group after demodulation;
Scramble process unit, for carrying out scramble process to the code block group after described demodulation, obtains the code block group after descrambling;
Bit-level processing unit, for carrying out bit-level process to the code block group after described descrambling, obtains the user data that terminal sends, and completes upward signal and receives.
10. base station according to claim 9, is characterized in that, described signal processing unit, specifically for:
Channel estimating, detection are carried out to the upward signal received, obtain symbol sebolic addressing to be demodulated, described symbol sebolic addressing to be demodulated comprises data symbol and control character, and described control character indicates RI symbol and response ACK symbol to form by channel quality indicator (CQI) symbol, order.
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