CN107317664A - A kind of transmission method of control channel - Google Patents
A kind of transmission method of control channel Download PDFInfo
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- CN107317664A CN107317664A CN201710743581.1A CN201710743581A CN107317664A CN 107317664 A CN107317664 A CN 107317664A CN 201710743581 A CN201710743581 A CN 201710743581A CN 107317664 A CN107317664 A CN 107317664A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0061—Error detection codes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0014—Three-dimensional division
- H04L5/0023—Time-frequency-space
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0037—Inter-user or inter-terminal allocation
- H04L5/0041—Frequency-non-contiguous
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/046—Wireless resource allocation based on the type of the allocated resource the resource being in the space domain, e.g. beams
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
- H04B7/0695—Hybrid systems, i.e. switching and simultaneous transmission using beam selection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0868—Hybrid systems, i.e. switching and combining
- H04B7/088—Hybrid systems, i.e. switching and combining using beam selection
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The invention discloses a kind of transmission method of control channel, including：1）Pilot tone and control channel for demodulating control channel use identical precoding；2）Control channel uses the transmission means of diversity；3）Control channel is broken up in frequency domain resource；4）Frequency domain is broken up by a kind of granularity；5）Granularity is broken up as different polymerization degree changes, is specifically included：High polymerization grade breaks up granularity greatly, and it is small that oligomerization grade breaks up granularity；6）Pilot density changes with the change of the degree of polymerization, specifically includes：Oligomerization grade pilot density is close, and high polymerization grade pilot density is sparse.The present invention can be solved under the unknowable state of channel information, it is impossible to the problem of carrying out reliable data transfer using accurately wave beam.
Description
Technical field
The invention belongs to communication technical field, and in particular to a kind of transmission method of control channel.
Background technology
With the progress of radiotechnics, the growth of the popularization data service of various intelligent terminals, service of mobile communication
Future is every year close to 1 times of speed.METIS（Mobile and wireless communication enablers for
the 2020 information society）Volume forecasting on 5G：Coming 10 years data service increases by 1000 times.
4G systems are used for such as OFDM (orthogonal frequency division multiplexing),
MIMO(multiple input multiple output),MU-MIMO(multiple user MIMO),HARQ(hybrid
Automatic repeat request) etc. technology to improve the spectrum efficiency of cell, pass through smaller cell skill upgradings
The power system capacity of certain area.
These above-mentioned technologies are used for the speed for lifting Traffic Channel, flexibility and robustness, but for control channel or control
How the transmission of message processed realizes that transmitting turns into bottleneck urgently to be resolved hurrily, and on the other hand all GSMs make at present
With 300MHz ~ 3GHz frequency spectrum, there are a large amount of resources not yet utilized in 3GHz ~ 300GHz spectral range.
In following be wirelessly transferred, the transmission based on wave beam would is that a kind of basic transmission means, but channel letter
Breath is not knowable all the time, and for example terminal terminal and base station in initial access process does not carry out the training on wave beam, base
Standing can not be carried out data transmission using accurately wave beam.
A kind of method is that SFBC mode is transmitted, but the pilot frequency port of this scheme requirement two and the above.In order to save
A kind of scheme of pilot-frequency expense is by the way of precoding training in rotation, in order to which the precoding being optimal should will treat the precoding of training in rotation
Break up in frequency domain to obtain frequency diversity gain.
The method that can then use beam shaping when channel information is available, is obtained down by CSI feedback or channel reciprocity
The preferred beam information of row, a certain frequency domain granularity transmitting control message by the way of beam shaping.
The transmission of two kinds of control messages is applied to different scenes, but because it demodulates pilot tone and control for terminal
Channel uses identical pre-coding matrix, therefore is transparent for receiver.
In order that the demodulation of control channel is transparent, control channel and pilot tone use identical precoding.But channel estimation
Performance is relevant with the sampling point number of pilot tone, and pilot tone number more multichannel estimated accuracy is higher in identical frequency domain bandwidth, but pilot tone
Sampling point can excessively cause identical TBsize code check lifting to influence transmission performance.
Fig. 1, Fig. 2 are the performances of control channel different pilot densities of difference bundle size under different polymerization degree carrying
Contrast.
Comparison diagram 1, Fig. 2 results understand that the unified bundle size of selection and pilot density are difficult to realize in each scene
All it is preferred configuration.
It is excellent using small bundle size performances when understanding that the degree of polymerization is small from Fig. 1, Fig. 2, the small degree of polymerization and use
Less pilot density performance is excellent, when then excellent using big bundle size performances using the big degree of polymerization, therefore from the angle of performance
Degree is seen, it is impossible to reach best performance for all terminals configuration same parameters.
The content of the invention
In order to overcome the above-mentioned deficiency of prior art, it is an object of the invention to provide a kind of transmission method of control channel.
This method can be solved under the unknowable state of channel information, it is impossible to carry out asking for reliable data transfer using accurately wave beam
Topic.
To achieve these goals, the technical solution adopted in the present invention is：A kind of transmission method of control channel, bag
Include：
1）Pilot tone and control channel for demodulating control channel use identical precoding；
2）Control channel uses the transmission means of diversity；
3）Control channel is broken up in frequency domain resource；
4）Frequency domain is broken up by a kind of granularity；
5）Granularity is broken up as different polymerization degree changes, is specifically included：High polymerization grade breaks up granularity greatly, oligomerization grade
Break up granularity small；
6）Pilot density changes with the change of the degree of polymerization, specifically includes：Oligomerization grade pilot density is close, height polymerization etc.
Level pilot density is sparse.
Beneficial effects of the present invention are：
Pilot density is fixed in existing method, and is not broken up in existing method according to certain granularity, further this programme
Also air exercise shot degree makes a distinction, and is broken up in small polymerization grade using small granularity.Used in big polymerization grade
Big granularity is broken up.
Beneficial effect has：
Best performance is realized in the division for break up granularity according to degree of polymerization size；
Pilot density is variable, adapts to the transmission of code check sensitive traffic, and transmission performance is lifted by reducing pilot density.
Brief description of the drawings
Fig. 1 is the performance comparison curve of difference bundle size differences pilot density when the degree of polymerization is 1；
Fig. 2 is the performance comparison curve of difference bundle size differences pilot density when the degree of polymerization is 8；
The modular structure schematic diagram that Fig. 3 is used by embodiment 3；
Fig. 4 is the resource allocation configuration in embodiment 3.1.
Embodiment
Deploy to describe with embodiment below, but the present invention is not limited to following examples.
Embodiment 1
The present embodiment scene description：
Terminal and base station have carried out initial beam selection after setting up connection, and the translational speed of terminal is slow, such as 30kmph
Following translational speed, terminal is not at cell edge.In this case terminal and wave beam can use the side of beam shaping
Formula transmits data, including business and control data.
The base station is configured to the resource of control channel, including：The running time-frequency resource of control channel, control channel it is poly-
Close grade, the original data bits digit of control channel, the transmission mechanism of control channel.
The frequency domain resource of the control channel includes frequency domain original position and bandwidth, and time-domain resource includes rising for control channel
Beginning OFDM symbol, the duration of control channel.The polymerization grade of control channel is to realize the adaptive of different channels environment
Transmission, for same control message, its polymerization grade is different, and code check is had than larger difference.
The original bit number of control message is that 26, CRC length is 24 in the present embodiment, and the running time-frequency resource of control channel is accounted for
According to RE numbers calculate as follows：
NRE=nREG*nRE_perREG, wherein nREG are the corresponding REG numbers of bandwidth shared by control channel, and nSymb is control
The OFDM symbol number of channel, nRE_perREG is the polymerization grade used in each REG number of pilots, the present embodiment
Aggregation level are that the CCE numbers that a 1 i.e. control channel is occupied are that 1,1 CCE includes 6 REG.Control channel
Using QPSK modulation system, pilot tone occupies 4 RE on each REG, therefore nRE_perREG is 8, and the degree of polymerization is 1 available RE
Number is 8*6=48, and the bit number of carrying is 96, therefore effective code check of control channel is 40/96.
The present embodiment terminal and base station have carried out wave beam training, therefore base station is controlled channel using accurate wave beam
Transmission.And the resource mapping method of control channel is localized mode, base station is by the way that control message is dispatched preferred
Subband comes scheduling gains and beam shaping gain for the transmission belt of control message.
Embodiment 2
The present embodiment scene description：
Terminal and base station have carried out initial beam selection after setting up connection, and the translational speed of terminal is fast, such as 350kmph
Translational speed above.In this case because high translational speed causes accurately CSI acquisitions difficult, now using the biography of open loop
Defeated mechanism.
The base station is configured to the resource of control channel, including：The running time-frequency resource of control channel, control channel it is poly-
Close grade, the original data bits digit of control channel, the transmission mechanism of control channel.
The frequency domain resource of the control channel includes frequency domain original position and bandwidth, and time-domain resource includes rising for control channel
Beginning OFDM symbol, the duration of control channel.The polymerization grade of control channel is to realize the adaptive of different channels environment
Transmission, for same control message, its polymerization grade is different, and effective ripple can not be used due to can not now obtain accurately CSI
Beam excipient, ensures the robustness of control channel by the way of wave beam training in rotation.Due in order to ensure the gain of wave beam training in rotation and cover
Lid robustness should be in resource where control channel using distribution（distributed）Resource distribution mode, be similarly
The gain of lifting diversity-wave should use larger polymerization grade, and the degree of polymerization used here is for 4, i.e., 4 CCE are for carrying
Control message.
The original bit number of control message is that 40, CRC length is 24 in the present embodiment, and the running time-frequency resource of control channel is accounted for
According to RE numbers calculate as follows：
NRE=nREG*nRE_perREG, wherein nREG are the corresponding REG numbers of bandwidth shared by control channel, and nSymb is control
The OFDM symbol number of channel processed, nRE_perREG is the polymerization grade used in each REG number of pilots, the present embodiment
Aggregation level are that the CCE numbers that a 1 i.e. control channel is occupied are that 4,1 CCE includes 6 REG.Control channel
Using QPSK modulation system, pilot tone occupies 4 RE on each REG, therefore nRE_perREG is 8, and the degree of polymerization is 1 available RE
Number is 8*6*4=192, and the bit number of carrying is 384, therefore effective code check of control channel is 64/384.
The present embodiment terminal and base station CSI are unavailable, therefore base station uses wave beam training in rotation mechanism, in order to realize that diversity increases
Benefit, employs distributed resource mapping method.
Embodiment 2.1
The present embodiment scene description：
Terminal and base station have carried out initial beam selection after setting up connection, and the translational speed of terminal is fast, such as 350kmph
Translational speed above.In this case because high translational speed causes accurately CSI acquisitions difficult, now using the biography of open loop
Defeated mechanism.
The base station is configured to the resource of control channel, including：The running time-frequency resource of control channel, control channel it is poly-
Close grade, the original data bits digit of control channel, the transmission mechanism of control channel.
The frequency domain resource of the control channel includes frequency domain original position and bandwidth, and time-domain resource includes rising for control channel
Beginning OFDM symbol, the duration of control channel.The polymerization grade of control channel is to realize the adaptive of different channels environment
Transmission, for same control message, its polymerization grade is different, and effective ripple can not be used due to can not now obtain accurately CSI
Beam excipient, ensures the robustness of control channel by the way of wave beam training in rotation.Due in order to ensure the gain of wave beam training in rotation and cover
Lid robustness should be in resource where control channel using distribution（distributed）Resource distribution mode, be similarly
The gain of lifting diversity-wave should use larger polymerization grade, and the degree of polymerization used here is for 4, i.e., 4 CCE are for carrying
Control message.
The present embodiment terminal and base station CSI are unavailable, therefore base station uses wave beam training in rotation mechanism, in order to realize that diversity increases
Benefit, employs distributed resource mapping method.
A kind of that larger bundle is preferably used under big polymerization grade, base station is using 6 frequency domains herein
Continuous REG uses same pre-coding matrix, and control channel has 4 CCE, and therefore a CCE includes 6 REG i.e.
Just more pilot tone sampling point can also be obtained using less pilot density and ensures precision of channel estimation.Therefore the pilot tone used here
Density is 3RE per REG.
The original bit number of control message is that 40, CRC length is 24 in the present embodiment, and the running time-frequency resource of control channel is accounted for
According to RE numbers calculate as follows：
NRE=nREG*nRE_perREG, wherein nREG are the corresponding REG numbers of bandwidth shared by control channel, and nSymb is control
The OFDM symbol number of channel, nRE_perREG is the polymerization grade used in each REG number of pilots, the present embodiment
Aggregation level are that the CCE numbers that a 1 i.e. control channel is occupied are that 4,1 CCE includes 6 REG.Control channel
Using QPSK modulation system, pilot tone occupies 2 RE on each REG, therefore nRE_perREG is 10, the degree of polymerization for 1 it is available
RE numbers are 10*6*4=240, and the bit number of carrying is 480, therefore effective code check of control channel is 64/480.
Embodiment 3
As shown in figure 3, wherein, channel circumstance recognition unit includes the measurement of translational speed and multi-path environment, and its measurement process can
Carried out in base station or end side.
Measurement for Doppler can be configured transmission position and the cycle of sounding channels, base station by base station for terminal
Doppler shift is realized according to the measurement of sounding signals, and then realizes the identification to cell relative velocity.On the other hand one
A little terminals are configured with speed instrument, and terminal can report translational speed directly to base station, and this mode does not require that terminal is frequently sent out
Sounding, but the poor in timeliness of this method are sent, is adapted to the environment of the fixed translational speed such as high ferro.
The measurement of multi-path environment can also use the sounding signals of base station receiving terminal, or the mode that terminal is reported.
If base station is measured, base station requires that terminal sends detectable signal, and the signal that base station is sent to terminal is carried out
Separate and revert to time domain and recognize multi-path information by way of related.Another way is terminal by detecting the synchronization of base station
Signal, recognizes multi-path information, this method needs to report, therefore also is adapted for the relatively-stationary ring of channel circumstance by synchronizing signal
Border.
Embodiment 3.1
Channel circumstance recognition unit is that terminal configures sounding, and its resource is fixed a certain frequency domain, and the cycle is 5ms, eventually
End sends sounding signals in corresponding position according to configuration, and sounding signals use ZC sequences.Base station receiving terminal
Sequence, first base station first filter out the remainder data outside this terminal.Data are gone into time domain again, by known array with receiving
The multi-path information of data Classical correlation channel.
Channel circumstance identification cell configuration pilot signal, identical pilot frequency sequence repeats to send in two OFDM symbols,
Terminal calculates phase difference, frequency deviation further basis is obtained according to phase difference by receiving the time-domain signal in adjacent OFDM symbol
Frequency deviation obtains translational speed.
Specifically, the data of two adjacent OFDM symbol correspondence position are designated as rx1=a (1) * exp (- j*2*pi*deltaF*
T1), rx2=b (1) * exp (- j*2*pi*deltaF*t2), then phase offset is deltaF=deltaFi/ (2*pi*
deltaT)；DeltaT=t2-t1, deltaFi=phase (rx2/rx1)；Wherein phase is to seek phase to a complex vector
Operation.T1 is first symbol corresponding time in two adjacent OFDM symbol, and t2 is second in adjacent OFDM symbol
The OFDM corresponding times.DeltaF represents subcarrier spacing, and Fi represents phase pushing figure,（If it is considered to conflict with F can for this variable
It is changed to phi or φ）, j is ordinal number unit, and it is the corresponding reception data of former and later two symbols not see l, rx1 and rx2,
DeltaT represents the time difference of adjacent two symbol, and terminal measures its translational speed and reports base station.
The two adjacent OFDM symbol, can be it is front and rear close to or two symbols between there are some OFDM symbols.
The identification of channel Doppler and multipath conditions is completed by above-mentioned steps, further channel circumstance recognition unit leads to
Sounding signals are crossed to realize the measurement of path loss to determine to be controlled the preferred polymeric grade of transmission.Path loss is big in brief
UE be believed that cell edge for ensure control channel covering should using the degree of polymerization it is big by the way of transmit, such as degree of polymerization
Selection 4 or 8.
It is as shown in table 1 that inside of base station builds parameter：
RSD represents pilot density, and Reference Signal Density abbreviation, RSD_t represents time domain density, i.e., per some
Individual OFDM symbol inserts pilot tone, and RSD_f represents the frequency domain density of pilot tone, i.e., a pilot tone is inserted per several subcarriers.AL_x
Polymerization grade is represented, Bs_x represents bundle size value.
The time domain of pilot tone, frequency domain density and the polymerization for transmitting control channel can be determined by aforementioned measurements and upper table
Degree.It is transmitted when path loss is [L1 L2] using AL_x polymerization grade.
The transmission of channel is controlled in this example using polymerization grade 4.Due to using larger polymerization grade according to above-mentioned
Simulation result is contemplated that larger bundle size carry out REG division, uses bundle size to enter for 6 granularity herein
Row precoding.
Further, on the one hand the selection of pilot density will ensure that meet frequency domain density portrays frequency-selective channel to meet,
On the other hand, the balancing procedure of channel estimation requires that pilot tone sampling point meets certain demand, it is therefore desirable to different bundle
Size sets different pilot density lower limits as shown in table 2：
While satisfaction frequency selects density, the pilot density of channel interpolation is further determined that according to following table, it is however generally that RSD_BSx
Value be greater than or equal to RSD_f.Corresponding pilot density is searched according to bundle size value.
The pilot density finally determined is：RSD3 = max（RSD_BS2, RSD_f）.
Precoding unit carries out base station and terminal in precoding, this example to control message and does not carry out wave beam training, therefore
The preferred wave beam of this relative terminal is not known in base station.Therefore the control that base station selects multiple code words to be applied to this terminal in the codebook is believed
Road and corresponding demodulation pilot tone.
It is control channel bandwidth BW _ ctrl=24REG of terminal configuration in this embodiment, time domain width is 2 OFDM symbols
Number, therefore total REG quantity is 48.I.e. 24 REG of 4 CCE are combined into for the running time-frequency resource collection of this terminal transmission control channel.One
The resource allocation methods for planting control channel are as shown in Figure 4.
Reference picture 4, one identical pre-coding matrix of each continuous 6 REG frames correspondence, this 6 REG are one
Bundle, the selection of pre-coding matrix can sequentially be chosen from code book, for example, can be selected from table 3：
A kind of method is that the corresponding vector of the different code words of selection sequentially is applied to selection on different bundle or random
Its principle of code word travels through all code words to try one's best.
For a kind of scheme of map unit mapped in units of bundle, the command character by taking Fig. 2 as an example after coded modulation
It is again 1,2,3 in the numbering of second OFDM symbol that data are put on the REG that first symbol REG numbering is 1,2,3 by number elder generation
REG on put data.Have an opportunity the small control channel of blind Detecting polymerization grade as early as possible for this mode terminal.
Another transmission method, terminal and base station have carried out the preferred wave beam that terminal is known in wave beam training base station, with
The mode of localized mapping mode closed loop beam excipient transmits control channel.
AL1 is considered oligomerization grade in control channel transmission, and AL8 is considered high polymerization grade, and AL2 and AL4 are medium
Polymerization grade.Based on this, polymerization grade and bundle size's can be with as follows：
1) AL1, AL2, AL4 are to a bundle size 2, AL8 correspondence bundle size 3
2) AL1, AL2, AL4 correspondence bundle size 2, AL8 correspondence bundle size6；
3) AL1, AL2, AL4 correspondence bundle size 3, AL8 correspondence bundle size6；
4) AL1, AL2 correspondence bundle size 2, AL4, AL8 correspondence bundle size3；
5) AL1, AL2 correspondence bundle size 3, AL4, AL8 correspondence bundle size6；
6) AL1, AL2 correspondence bundle size3, AL4AL8 correspondence bundle size6.
Claims (3)
1. a kind of transmission method of control channel, it is characterised in that comprise the following steps：
1）Pilot tone and control channel for demodulating control channel use identical precoding；
2）Control channel uses the transmission means of diversity；
3）Control channel is broken up in frequency domain resource；
4）Frequency domain is broken up by a kind of granularity；
5）Granularity is broken up as different polymerization degree changes；
6）Pilot density changes with the change of the degree of polymerization.
2. a kind of transmission method of control channel according to claim 1, it is characterised in that it is described break up granularity from it is different
Degree of polymerization relation, is specifically included：It is big that high polymerization grade breaks up granularity；It is small that oligomerization grade breaks up granularity.
3. the transmission method of a kind of control channel according to claim 1, it is characterised in that the pilot density is with polymerizeing
Degree relation, is specifically included：Oligomerization grade pilot density is close；High polymerization grade pilot density is sparse.
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