CN104348601A - Uplink control information transmission method for wireless communication system - Google Patents
Uplink control information transmission method for wireless communication system Download PDFInfo
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- CN104348601A CN104348601A CN201310343792.8A CN201310343792A CN104348601A CN 104348601 A CN104348601 A CN 104348601A CN 201310343792 A CN201310343792 A CN 201310343792A CN 104348601 A CN104348601 A CN 104348601A
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- pucch
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- control information
- scrambler
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
- H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
- H04W72/1268—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of uplink data flows
Abstract
The invention relates to an uplink control information transmission method for a wireless communication system. The method comprises the following steps that before a terminal sends uplink control information, firstly, one RNTI (radio network temporary identifier) including parameters required by the uplink control information sent by the terminal is allocated to the terminal by a base station; the terminal carries out coding modulation on the uplink control information to be sent according to the system parameters including the RNTI and the frame number, PUCCH signals are generated, and in addition, the modulated signals are sent on the uplink sub frame PUCCH. Through the method provided by the invention, each terminal can obtain PUCCH resources occupied by each frame through a simple algorithm according to the RNTI and the frame number allocated after the access success. In addition, for each terminal, through the frequency hopping among sub carrier waves, the frequency diversity gain can be obtained. In addition, through adopting a code division multiplexing mode in each sub carrier wave, the system can flexibly adapt to the dynamic change requirements of the information bit number and the terminal number requiring uplink control information transmission.
Description
Technical field
The present invention relates to wireless communication technology, particularly relate to a kind of uplink control information transmission method.
Background technology
In a wireless communication system, transmission link is divided into from down link and up link by the transmission direction according to wireless signal, and wherein down link refers to that the transmission direction of terminal is arrived in base station, and up link refers to the transmission direction of terminal to base station.Usually according to the information type of carrying, further physical channel is divided into physical uplink link shared channels (the Physical Uplink Shared Channel of carrying uplink service information, PUSCH), physical uplink control channel (the Physical Uplink Control Channel of carrying ascending control information, and Physical Random Access Channel (the Physical Random Access Channel of carrying upstream terminal access information PUCCH), PRACH), and the physical down link sharing channel of bearing downlink business information (Physical Downlink Shared Channel, PDSCH), physical downlink control channel (the Physical Downlink Control Channel of Downlink Control Information, PUCCH) etc.
In a wireless communication system, terminal reports various information by PUCCH to base station, and such as in the access procedure of community, terminal transmits the various signaling mutual with base station by PUCCH, realizes the foundation of community access and service channel; In business transmitting procedure, terminal reports state information such as scheduling reply, down channel measurement result, HARQ Warning Mark etc. by PUCCH to base station, realizes scheduling of resource optimization and HARQ etc. with assistant base station.The all terminals accessing same base station utilize PUCCH to base-station transmission ascending control information by the mode of time division multiplexing, frequency division multiplexing or code division multiplexing.The information bit needing the terminal number of transmitting uplink control information and the transmission of each terminal needs under the same base station of each frame is dynamic change.This just requires that uplink control information transmission method can adapt to this dynamic variation characteristic, makes system be fast, simply the channel resource of each terminal distribution transmitting uplink control information.
Summary of the invention
In a wireless communication system, under same base station, each frame needs the information bit of the terminal number of transmitting uplink control information and the transmission of each terminal needs to be dynamic change.Uplink control information transmission method needs to adapt to this dynamic variation characteristic, makes system can utilize simple resource allocation algorithm, channel resource needed for each terminal distribution transmitting uplink control information.
The invention discloses the transmission method of ascending control information in a kind of wireless communication system, the method comprises:
Sending before ascending control information in terminal, is first terminal distribution Radio Network Temporary Identifier (Radio Network Temporary Identity, RNTI) by base station, wherein comprises terminal and sends parameter needed for ascending control information.Terminal, according to receiving the other system such as RNTI and frame number parameter, carries out coded modulation to sent ascending control information, produces PUCCH signal, and on sub-frame of uplink PUCCH physical channel, send the signal after modulation.
Method as above, wherein send in interval at PUCCH and system bandwidth is divided into M subcarrier uniformly, wherein M is positive integer.Each terminal can only be selected to send PUCCH signal on one sub-carrier.
Method as above, the PUCCH signal wherein sent in each terminal is made up of the data-signal of duration to be the pilot signal of n symbol and duration be m symbol.
Method as above, the parameter that the terminal comprised in the RNTI of wherein base station assigns sends needed for ascending control information comprises: terminal sends the initial subcarrier number of PUCCH, PUCCH pilot number and PUCCH pilot tone scrambling code number.
Method as above, wherein the method for terminal transmission ascending control information comprises: first according to the initial subcarrier number comprised in RNTI and current frame number, calculates the subcarrier number that present frame sends PUCCH.The feature of computational methods is: in each frame, and the subcarrier number that the terminal with different initial subcarrier number is selected is also different.
Method as above, wherein the method for terminal transmission ascending control information also comprises: according to the PUCCH pilot number comprised in RNTI and PUCCH pilot tone scrambling code number, produce the PUCCH pilot signal of this terminal.Its concrete grammar is:
1) terminal chooses corresponding sequence according to the PUCCH pilot number comprised in RNTI from PUCCH pilot frequency sequence group, and wherein PUCCH pilot frequency sequence group is the Sequence composition of n symbol by L length, and L is positive integer; The feature of PUCCH pilot frequency sequence group is, PUCCH pilot number and sequence one_to_one corresponding in group; In group all there is the fast correlation algorithm of low complex degree in all sequences;
2) from current base station PUCCH pilot tone scrambler group, corresponding scrambler is chosen, to the scrambling of above-mentioned PUCCH pilot frequency sequence according to the PUCCH pilot tone scrambling code number comprised in RNTI; Current base station PUCCH pilot tone scrambler group is the subset of system PUCCH pilot tone scrambler group, the PUCCH pilot tone scrambler group that current base station is corresponding can be obtained after each terminal connecting system, wherein system PUCCH pilot tone scrambler group is n symbol by P length and the scrambler with good autocorrelation and cross correlation is formed, and P is positive integer; PUCCH pilot tone scrambling code number and current base station PUCCH pilot tone scrambler group scrambler one_to_one corresponding.
Method as above, wherein the method for terminal transmission ascending control information also comprises: according to base station identity information and the terminal identity information of terminal access, produce the PUCCH data signal of this terminal.Its concrete grammar is:
1) the ascending control information bit number i that terminal need be transmitted according to present frame calculates the code channel number Nc=ceil (i/k) taken, wherein k is the information bit of a maximum carrying of code channel, the smallest positive integral being more than or equal to x is got in ceil (x) expression, and code channel number Nc is positive integer; Fill Nc*k – l bit at ascending control information stream afterbody and become the information flow that length is Nc*k bit, and be divided into the Nc section that length is k bit, be labeled as the 0th respectively, 1 ..., Nc-1 section;
2) generate and carry the scrambler that subscriber identity information and base station identity information, length are Nc*m symbol, it is characterized in that the scrambler carrying different user identity information and base station identity information has good autocorrelation and cross correlation; Be that the scrambler of Nc*m symbol is divided into the Nc section that length is all m symbol by length, be labeled as the 0th respectively, 1 ..., Nc-1 section;
3) to every segment length be the information of k bit, carry out respectively encoding, modulating, obtain the data-signal that length is m symbol, carry out scrambling by the identical scrambler section of numbering, obtain each code channel PUCCH data signal;
4) last, by all Nc code channel PUCCH data Signal averaging.
Method as above, wherein the method for terminal transmission ascending control information also comprises: the subcarrier number that the every frame of terminal is selected according to said method, is modulated to the PUCCH data signal after multiple connection and pilot signal on this subcarrier and sends.
Adopt the transmission method of PUCCH information that the present invention proposes, each terminal, according to the RNTI and the frame number that accesss successfully distribution afterwards, namely obtains by simple algorithm the PUCCH channel resource that each frame takies.And for each terminal, by the frequency hopping between subcarrier, can frequency diversity gain be obtained; And by code division multiplexing mode in each subcarrier, system can the terminal number and the information bit that need transmitting uplink control information of flexible adaptation dynamic change.
Accompanying drawing explanation
Figure 1 shows that PUCCH signal structure.
Figure 2 shows that PUCCH data signal creating method.
Embodiment
The transmission method main thought of the PUCCH information that the present invention proposes is that the multiplex mode that under same base station, the ascending control information of each terminal is divided by time-division, frequency division and code is carried in PUCCH, and terminal can determine according to the RNTI and frame number that access distribution successfully the PUCCH channel resource that each frame takies.Below in conjunction with drawings and the specific embodiments, technical scheme of the present invention is described further.
Take system bandwidth as 4MHz be example, be divided into the PUCCH subcarrier that 4 band widths are 1MHz.The RNTI distributed after terminal connecting system by length be the initial subcarrier number of PUCCH of 2 bits, the PUCCH pilot tone scrambling code number of length to be the PUCCH pilot number of 7 bits and length be 2 bits forms.
PUCCH signal structure as shown in Figure 1.PUCCH comprises PUCCH data signal and PUCCH pilot signal two parts, and wherein PUCCH data signal length is m=1024 symbol, is divided into length to be two sections of D0, D1 of 512 symbols, is distributed in PUCCH pilot signal both sides; PUCCH pilot signal R S length is n=128 symbol.
PUCCH pilot frequency sequence group is n=128 symbol by length and walsh code character after ovennodulation is formed, total L=128 walsh code in code character.First terminal is the PUCCH pilot number of 7 bits according to the length of specifying in RNTI, from PUCCH pilot frequency sequence group, select corresponding walsh code.Secondly, be the PUCCH pilot tone scrambling code number of 2 bits according to the length of specifying in RNTI, from current base station PUCCH pilot tone scrambler group, choose corresponding scrambler, to the scrambling of PUCCH pilot signal.Can obtain the PUCCH pilot tone scrambler group that current base station is corresponding after terminal connecting system, each base station PUCCH pilot tone scrambler group comprises 4 scramblers, belongs to the subset of system PUCCH pilot tone scrambler group.Wherein each scrambler of system PUCCH pilot tone scrambler group has good autocorrelation and cross correlation, and therefore base station is when carrying out reception process to PUCCH, can carry out channel estimating respectively to each terminal.
PUCCH data signal adopts walsh coding, each code channel maximum carrying 40 bit information (i.e. k=40).To need in system to transmit the ascending control information that length is 40 bits and 80 bits, the generation method of PUCCH data signal is described:
1) for length be the ascending control information of l=40 bit, the code channel number taken is Nc=ceil (l/k)=1; And be the ascending control information of l=80 bit for length, the code channel number taken is Nc=ceil (l/k)=2, information is divided into two sections that length is all 40 bits.
2) with the base station identity information of terminal identity information and terminal access for initial value, generate GOLD code as scrambler distinguishing terminal and base station.For the ascending control information that length is l=40 bit, raw scrambler of growing into 1024 symbols; For the ascending control information that length is l=80 bit, raw scrambler of growing into 2048 symbols, and be divided into two sections that length is all 1024 symbols.
3) the k=40 bit information for each code channel carries out coded modulation, obtain 1024 symbol data signals, concrete grammar is: k=40 bit information is divided into two sections that length is 20 bits, respectively according to the coded modulation of carrying out 20 bit->512 symbols as shown in Figure 2, obtain 512 symbol data signals, then multiple connection obtains 1024 symbol data signals together.Wherein, the code modulating method of 20 bit->512 symbols is: the information of 20 bits be divided into length to be all two groups of 10 bits, and for every group, wherein 9 bits of encoded obtain 512 bit walsh codes, carry out XOR with another 1 bit; The two groups of sequences obtained carry out QPSK modulation as I, Q two-way.
4) according to the corresponding scrambler section of code channel sequence selection, to the data-signal scrambling after each code channel coded modulation.
The present invention is not limited to above-mentioned embodiment, and the present invention can have various amendment and alternative form, and in drawings and detailed description, some specific embodiments are just stated as an example.But should be understood that these drawings and detailed description are never to limit the present invention on disclosed concrete form, on the contrary, the present invention should be included in whole amendments in scope as defined in the claims, equivalents and alternative form.
Claims (8)
1. a transmission method for wireless communication system ascending control information, is characterized in that, sends before ascending control information in terminal, is first the Radio Network Temporary Identifier RNTI that terminal distribution one comprises that terminal sends ascending control information desired parameters by base station; Terminal is according to the system parameters comprising RNTI and frame number, coded modulation is carried out to sent ascending control information, produce physical uplink control channel PUCCH signal, and the signal sent on sub-frame of uplink PUCCH after above-mentioned modulation and PUCCH signal.
2. method as claimed in claim 1, is characterized in that, described PUCCH sends in interval and system bandwidth is divided into M subcarrier uniformly, and wherein M is positive integer; Each terminal can only be selected to send PUCCH signal on one sub-carrier.
3. method as claimed in claim 1 or 2, is characterized in that, described PUCCH signal is made up of the PUCCH data signal of duration to be the PUCCH pilot signal of n symbol and duration be m symbol, and wherein m, n are positive integer.
4. method as described in claim 1,2 or 3, it is characterized in that, the parameter that the terminal comprised in the RNTI of described base station assigns sends needed for ascending control information comprises: terminal sends the initial subcarrier number of PUCCH, PUCCH pilot number and PUCCH pilot tone scrambling code number.
5. method as described in claim 3 or 4, is characterized in that, the method for described generation PUCCH pilot signal produces this terminal PUCCH pilot signal according to the PUCCH pilot number comprised in RNTI and PUCCH pilot tone scrambling code number, and concrete steps are:
First, terminal chooses corresponding sequence according to the PUCCH pilot number comprised in RNTI from PUCCH pilot frequency sequence group, and wherein PUCCH pilot frequency sequence group is n symbol by L length and has the Sequence composition of good autocorrelation and cross correlation, and L is positive integer; The feature of PUCCH pilot frequency sequence group is, PUCCH pilot number and sequence one_to_one corresponding in group; In group all there is the fast correlation algorithm of low complex degree in all sequences;
Then, terminal chooses corresponding scrambler, to the scrambling of above-mentioned PUCCH pilot frequency sequence according to the pilot tone scrambling code number comprised in RNTI from current base station PUCCH pilot tone scrambler group; Current base station PUCCH pilot tone scrambler group is the subset of system PUCCH pilot tone scrambler group, the PUCCH pilot tone scrambler group that current base station is corresponding can be obtained after each terminal connecting system, wherein system PUCCH pilot tone scrambler group is n symbol by P length and the scrambler with good autocorrelation and cross correlation is formed, and P is positive integer; PUCCH pilot tone scrambling code number and current base station PUCCH pilot tone scrambler group scrambler one_to_one corresponding.
6. method as described in claim 3 or 4, is characterized in that, the method for described generation PUCCH data signal is base station identity information according to terminal access and terminal identity information, and produce the PUCCH data signal of this terminal, concrete steps are:
First, the code channel number Nc=ceil (i/k) taken is calculated according to the ascending control information bit number i that present frame terminal need be transmitted, wherein k is the information bit of a maximum carrying of code channel, the smallest positive integral being more than or equal to x is got in ceil (x) expression, and code channel number Nc is positive integer; Fill Nc*k – l bit at ascending control information stream afterbody and become the information flow that length is Nc*k bit, and be divided into the Nc section that length is all k bit, be labeled as the 0th respectively, 1 ..., Nc-1 section;
Secondly, generate and carry the scrambler that subscriber identity information and base station identity information, length are Nc*m symbol, it is characterized in that the scrambler carrying different user identity information and base station identity information has good autocorrelation and cross correlation; Be that the scrambler of Nc*m symbol is divided into the Nc section that length is m symbol by length, be labeled as the 0th respectively, 1 ..., Nc-1 section;
Then, be the information of k bit to every segment length, carry out respectively encoding, modulating, obtain the data-signal that length is m symbol, carry out scrambling by the identical scrambler section of numbering, obtain each code channel PUCCH data signal;
Finally, by all Nc code channel PUCCH data Signal averaging.
7. method as described in any one of claim 2 to 6, is characterized in that, the method that described terminal sends ascending control information comprises: first according to the initial subcarrier number comprised in RNTI and current frame number, calculates the subcarrier number that present frame sends PUCCH; The feature of computational methods is: in each frame, and the subcarrier number that the terminal with different initial subcarrier number is selected is also different.
8. method as claimed in claim 7, it is characterized in that, the method that described terminal sends ascending control information also comprises, terminal sends the PUCCH subcarrier number of the method calculating present frame of PUCCH subcarrier number according to described calculating present frame, the PUCCH data signal after multiple connection and pilot signal are modulated on this subcarrier and send.
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