CN107317664B - Transmission method of control channel - Google Patents
Transmission method of control channel Download PDFInfo
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- CN107317664B CN107317664B CN201710743581.1A CN201710743581A CN107317664B CN 107317664 B CN107317664 B CN 107317664B CN 201710743581 A CN201710743581 A CN 201710743581A CN 107317664 B CN107317664 B CN 107317664B
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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
Abstract
The invention discloses a transmission method of a control channel, which comprises the following steps: 1) the pilot frequency used for demodulating the control channel and the control channel adopt the same precoding; 2) the control channel adopts a diversity transmission mode; 3) the control channels are scattered over the frequency domain resources; 4) the frequency domain is scattered according to a granularity; 5) the scattering particle size varies with different polymerization degrees, and specifically comprises the following steps: the high polymerization grade has large scattering particle size, and the low polymerization grade has small scattering particle size; 6) the pilot density changes with the change of the polymerization degree, and specifically includes: the pilot frequency density of low polymerization level is dense, and the pilot frequency density of high polymerization level is sparse. The invention can solve the problem that reliable data transmission can not be carried out by utilizing accurate wave beams under the condition that the channel information is unknown.
Description
Technical Field
The invention belongs to the technical field of communication, and particularly relates to a transmission method of a control channel.
Background
With the advance of radio technology and the increase of the popular data services of various intelligent terminals, the mobile communication traffic is nearly 1 time as fast as each year in the future. METIS (Mobile and wireless communication enablers for the 2020 information facility) traffic prediction with respect to 5G: data traffic will grow 1000 times in the next 10 years.
The 4G system has used technologies such as OFDM (orthogonal frequency division multiplexing), MIMO (multiple input multiple output), MU-MIMO (multiple user MIMO), HARQ (hybrid automatic repeat request) to improve the spectrum efficiency of a cell, and to improve the system capacity of a certain area by using the small cell technology.
The technologies are used for improving the speed, flexibility and robustness of a service channel, but how to realize reliable transmission of a control channel or a control message becomes a bottleneck to be solved urgently, and on the other hand, all current mobile communication systems use 300 MHz-3 GHz frequency spectrums, and a large amount of unutilized resources exist in the frequency spectrum range of 3 GHz-300 GHz.
In future wireless transmission, beam-based transmission will be a basic transmission mode, however, channel information is not known all the time, for example, the terminal and the base station do not train on the beam during initial access, and the base station cannot utilize an accurate beam for data transmission.
One approach is SFBC, but this approach requires two or more pilot ports. One scheme for saving the pilot overhead is to use a precoding rotation training mode, and to achieve the optimal precoding, the precoding to be rotated should be scattered in the frequency domain range to obtain the frequency domain diversity gain.
When the channel information is available, a beamforming method can be adopted to obtain the downlink preferred beam information through CSI feedback or channel reciprocity, and a beamforming mode is adopted to transmit the control message in a certain frequency domain granularity.
The transmission of the two control messages is applicable to different scenarios, but is transparent to the receiver for the terminal since its demodulation pilots and control channels use the same precoding matrix.
In order to make the demodulation of the control channel transparent, the control channel and the pilot use the same precoding. However, the performance of channel estimation is related to the number of pilot frequency samples, and the greater the number of pilot frequencies in the same frequency domain bandwidth, the higher the channel estimation accuracy, but the more pilot frequency samples will cause the increase of the code rate of the same TBsize to affect the transmission performance.
Fig. 1 and fig. 2 are performance comparisons of different pilot densities of different bundle sizes under different aggregation degree bearers of a control channel.
Comparing the results of fig. 1 and fig. 2, it is known that it is difficult to achieve the preferred configuration in each scene by selecting the uniform bundle size and pilot density.
As can be seen from fig. 1 and 2, when the degree of polymerization is small, the performance is excellent when a small size is used, and when the degree of polymerization is small, the performance is excellent when a small size is used and the pilot density is used, and when the degree of polymerization is large, the performance is excellent when a large size is used, and therefore, from the performance viewpoint, the performance cannot be optimized by configuring the same parameter for all terminals.
Disclosure of Invention
In order to overcome the above-mentioned deficiencies of the prior art, the present invention provides a transmission method of a control channel. The method can solve the problem that reliable data transmission cannot be carried out by utilizing accurate beams under the condition that the channel information is unknown.
In order to achieve the purpose, the invention adopts the technical scheme that: a method for transmitting a control channel, comprising:
1) The pilot frequency used for demodulating the control channel and the control channel adopt the same precoding;
2) The control channel adopts a diversity transmission mode;
3) The control channels are scattered over the frequency domain resources;
4) The frequency domain is scattered according to a granularity;
5) The scattering particle size varies with different polymerization degrees, and specifically comprises the following steps: the high polymerization grade has large scattering particle size, and the low polymerization grade has small scattering particle size;
6) The pilot density changes with the change of the polymerization degree, and specifically includes: the pilot frequency density of low polymerization level is dense, and the pilot frequency density of high polymerization level is sparse.
The invention has the beneficial effects that:
In the prior art, the pilot frequency density is fixed, and the prior art does not scatter according to a certain granularity, and further, the scheme also distinguishes scattered granularity and scatters by adopting small granularity when the aggregation level is small. Break-up is done at large polymerization levels with large particle sizes.
Has the beneficial effects that:
Dividing the scattering particle size according to the polymerization degree to realize optimal performance;
The pilot frequency density is variable, the method is suitable for code rate sensitive service transmission, and the transmission performance is improved by reducing the pilot frequency density.
Drawings
FIG. 1 is a performance comparison curve of different bundle sizes and different pilot densities when the polymerization degree is 1;
FIG. 2 is a performance comparison curve of different bundle sizes and different pilot densities when the polymerization degree is 8;
FIG. 3 is a schematic block diagram of the embodiment 3;
Fig. 4 shows the resource allocation configuration in embodiment 3.1.
Detailed Description
The following examples are given for illustration, but the present invention is not limited to the following examples.
Example 1
The scene description of the embodiment:
Initial beam selection is performed after the terminal and the base station establish a connection, and the terminal moves slowly, for example, moves below 30kmph, and the terminal is not located at the cell edge. In this case, the terminal and the beam may transmit data, including traffic and control data, in a beamforming manner.
The base station configures resources of a control channel, including: time frequency resources of a control channel, aggregation level of the control channel, original data bit number of the control channel and a transmission mechanism of the control channel.
The frequency domain resources of the control channel comprise a frequency domain starting position and a bandwidth, and the time domain resources comprise a starting OFDM symbol of the control channel and a duration of the control channel. The aggregation level of the control channel is to realize adaptive transmission in different channel environments, and for the same control message, the aggregation level is different, and the code rate has larger difference.
In this embodiment, the original bit number of the control message is 26, and the CRC length is 24, then the number of REs occupied by the time-frequency resource of the control channel is calculated as follows:
nRE = nRE × nRE _ perREG, where nRE is the REG number corresponding to the bandwidth occupied by the control channel, nSymb is the OFDM symbol number of the control channel, and nRE _ perREG is the pilot number of each REG, the aggregation level adopted in this embodiment is 1, that is, the number of CCEs occupied by one control channel is 1, and 1 CCE includes 6 REGs. The control channel adopts a QPSK modulation mode, the pilot frequency on each REG occupies 4 REs, so that nrE _ perREG is 8, the number of available REs with polymerization degree of 1 is 8 x 6=48, the number of carried bits is 96, and the effective code rate of the control channel is 40/96.
In this embodiment, the terminal and the base station perform beam training, so that the base station uses an accurate beam to perform transmission of a control channel. And the resource mapping mode of the control channel is localized, and the base station brings scheduling gain and beamforming gain for the transmission of the control message by scheduling the control message in the preferred sub-band.
Example 2
The scene description of the embodiment:
The initial beam selection is performed after the terminal and the base station establish a connection, and the terminal has a fast moving speed, for example, a moving speed of 350kmph or more. In this case, accurate CSI acquisition is difficult due to high moving speed, and an open-loop transmission mechanism is adopted.
The base station configures resources of a control channel, including: time frequency resources of a control channel, aggregation level of the control channel, original data bit number of the control channel and a transmission mechanism of the control channel.
The frequency domain resources of the control channel comprise a frequency domain starting position and a bandwidth, and the time domain resources comprise a starting OFDM symbol of the control channel and a duration of the control channel. The aggregation levels of the control channels are different for realizing self-adaptive transmission in different channel environments, and the robustness of the control channels is ensured by adopting a beam training mode because effective beam forming cannot be adopted for acquiring accurate CSI (channel state information) at the moment because the aggregation levels of the same control message are different. Since a distributed resource allocation manner should be adopted on resources where a control channel is located in order to ensure gain and coverage robustness of beam rotation training, a larger aggregation level should be adopted in order to improve diversity beam gain, and the aggregation level adopted here is 4, that is, 4 CCEs are used to carry control messages.
In this embodiment, the original bit number of the control message is 40, and the CRC length is 24, the number of REs occupied by the time-frequency resource of the control channel is calculated as follows:
nRE = nRE × nRE _ perREG, where nRE is the REG number corresponding to the bandwidth occupied by the control channel, nSymb is the OFDM symbol number of the control channel, and nRE _ perREG is the pilot number of each REG, the aggregation level adopted in this embodiment is 1, that is, the number of CCEs occupied by one control channel is 4, and 1 CCE includes 6 REGs. The control channel adopts a QPSK modulation scheme, the pilot on each REG occupies 4 REs, so nRE _ perREG is 8, the number of available REs with a degree of polymerization of 1 is 8 × 6 × 4=192, and the number of bits carried is 384, so the effective code rate of the control channel is 64/384.
In this embodiment, the CSI of the terminal and the CSI of the base station are not available, so that the base station uses a beam training mechanism and a distributed resource mapping manner to achieve diversity gain.
Example 2.1
The scene description of the embodiment:
The initial beam selection is performed after the terminal and the base station establish a connection, and the terminal has a fast moving speed, for example, a moving speed of 350kmph or more. In this case, accurate CSI acquisition is difficult due to high moving speed, and an open-loop transmission mechanism is adopted.
The base station configures resources of a control channel, including: time frequency resources of a control channel, aggregation level of the control channel, original data bit number of the control channel and a transmission mechanism of the control channel.
The frequency domain resources of the control channel comprise a frequency domain starting position and a bandwidth, and the time domain resources comprise a starting OFDM symbol of the control channel and a duration of the control channel. The aggregation levels of the control channels are different for realizing self-adaptive transmission in different channel environments, and the robustness of the control channels is ensured by adopting a beam training mode because effective beam forming cannot be adopted for acquiring accurate CSI (channel state information) at the moment because the aggregation levels of the same control message are different. Since a distributed resource allocation manner should be adopted on resources where a control channel is located in order to ensure gain and coverage robustness of beam rotation training, a larger aggregation level should be adopted in order to improve diversity beam gain, and the aggregation level adopted here is 4, that is, 4 CCEs are used to carry control messages.
In this embodiment, the CSI of the terminal and the CSI of the base station are not available, so that the base station uses a beam training mechanism and a distributed resource mapping manner to achieve diversity gain.
A preferred way is to use a larger bundle at a large aggregation level, where the base station uses 6 frequency-domain consecutive REGs to use the same precoding matrix, and there are 4 CCEs in the control channel, and one CCE includes 6 REGs so that more pilot samples can be obtained to ensure channel estimation accuracy even with a smaller pilot density. The pilot density used here is therefore 3RE per REG.
In this embodiment, the original bit number of the control message is 40, and the CRC length is 24, the number of REs occupied by the time-frequency resource of the control channel is calculated as follows:
nRE = nRE × nRE _ perREG, where nRE is the REG number corresponding to the bandwidth occupied by the control channel, nSymb is the OFDM symbol number of the control channel, and nRE _ perREG is the pilot number of each REG, the aggregation level adopted in this embodiment is 1, that is, the number of CCEs occupied by one control channel is 4, and 1 CCE includes 6 REGs. The control channel adopts a QPSK modulation mode, the pilot on each REG occupies 2 REs, so that nRE _ PERREG is 10, the number of available REs with polymerization degree of 1 is 10 × 6 × 4=240, and the number of carried bits is 480, so that the effective code rate of the control channel is 64/480.
Example 3
As shown in fig. 3, wherein the channel environment identification unit includes measurement of the moving velocity and the multipath environment, the measurement process can be performed at the base station or the terminal side.
For the Doppler measurement, the base station can configure the sending position and the sending period of the sounding channel for the terminal, and the base station realizes Doppler frequency offset according to the sounding signal measurement, so as to realize the identification of the relative speed of the cell. On the other hand, some terminals are provided with speed measuring instruments, the terminals can directly report the moving speed to the base station, the method does not require the terminals to frequently send sounding, but the method is poor in timeliness and suitable for environments with fixed moving speeds such as high-speed rails.
The measurement of the multipath environment may also adopt a mode that the base station receives a sounding signal of the terminal or a mode that the terminal reports.
If the base station carries out measurement, the base station requires the terminal to send a detection signal, and the base station separates the signal sent by the terminal and restores the signal to a time domain to identify multipath information in a relevant mode. The other method is that the terminal detects the synchronous signal of the base station and identifies the multipath information through the synchronous signal, and the method needs to be reported, so the method is also suitable for the environment with relatively fixed channel environment.
Example 3.1
The channel environment identification unit configures sounding for the terminal, the resource of the sounding is in a fixed certain frequency domain range, the period is 5ms, the terminal sends sounding signals according to the configuration at a corresponding position, and the sounding signals adopt ZC sequences. The base station receives the sequence of the terminal, and firstly, the base station filters out the rest data except the terminal. The data is again transferred to the time domain and the multipath information for the channel is identified by the known sequence associated with the received data.
The channel environment recognition unit is configured with pilot signals, the same pilot sequence is repeatedly sent on two OFDM symbols, the terminal calculates the phase difference by receiving time domain signals on adjacent OFDM symbols, obtains the frequency offset according to the phase difference and further obtains the moving speed according to the frequency offset.
Specifically, data at positions corresponding to two adjacent OFDM symbols are denoted by rx1= a (1) × exp (-j × 2 × pi Δ f × t1), rx2 = b (1) × exp (-j × 2 × pi Δ f × t2), and the phase shift is deltaF = deltaFi/(2 × pi deltaT); deltaT = t2-t1, deltaFi = phase (rx2/rx 1); where phase is the operation of phasing a complex vector. t1 is the time corresponding to the first of two adjacent OFDM symbols, and t2 is the time corresponding to the second of two adjacent OFDM symbols. deltaF represents the subcarrier interval, Fi represents the phase offset, (phi or phi can be changed if the variable conflicts with F is considered), j is an ordinal unit, l is not seen, rx1 and rx2 are received data corresponding to two symbols before and after, deltaT represents the time difference between two adjacent symbols, and the terminal measures the moving speed and reports the moving speed to the base station.
The two adjacent OFDM symbols may be immediately adjacent to each other or several OFDM symbols exist between two symbols.
The identification of the channel Doppler and multipath conditions is completed through the steps, and further the channel environment identification unit realizes the measurement of the path loss through the sounding signal so as to determine the preferred aggregation level for controlling the channel transmission. In short, the UE with large path loss may consider that the control channel should be transmitted in a way with large aggregation degree at the cell edge, for example, the aggregation degree is selected to be 4 or 8.
The internal construction parameters of the base station are shown in table 1:
RSD represents pilot Density, Reference Signal sensitivity is abbreviated, RSD _ t represents time domain Density, namely pilot is inserted in each plurality of OFDM symbols, RSD _ f represents frequency domain Density of pilot, namely pilot is inserted in each plurality of subcarriers, A L _ x represents aggregation level, and Bs _ x represents value of bundle size.
the time domain, frequency domain density of the pilot and the aggregation degree of the transmission control channel can be determined by the measured values and the table, and the aggregation level of A L _ x is adopted for transmission when the path loss is L1L 2.
In this example, aggregation level 4 is used for control channel transmission. Since the larger bundle size should be considered for the REG division according to the above simulation results with the larger aggregation level, precoding is performed with a granularity of 6 bundle size here.
Further, the selection of the pilot density is to ensure that the frequency domain density is satisfied to satisfy the depiction of the frequency-selective channel, and on the other hand, the equalization process of channel estimation requires that the pilot samples satisfy certain requirements, so that different pilot density lower limits need to be set for different bundlesizes as shown in table 2:
While the frequency selection density is satisfied, the pilot density of channel interpolation is further determined according to the following table, and generally, the value of RSD _ BSx is greater than or equal to RSD _ f. And searching the corresponding pilot frequency density according to the value of the bundle size.
The final determined pilot density is: RSD3 = max (RSD _ BS2, RSD _ f).
The precoding unit precodes the control message, and in this example, the base station and the terminal do not perform beam training, so the base station does not know a preferred beam for the terminal. The base station therefore selects in the codebook a number of codewords to apply to the control channel and corresponding demodulation pilots of this terminal.
In this embodiment, the control channel bandwidth BW _ ctrl =24 REGs configured for the terminal, the time domain width is 2 OFDM symbols, and thus the total REG number is 48. The set of time-frequency resources for the terminal to transmit the control channel is 4 CCEs, i.e. 24 REGs. A resource allocation method for a control channel is shown in fig. 4.
Referring to fig. 4, each of the 6 consecutive REG frames corresponds to a same precoding matrix, where the 6 REGs are a bundle, and the precoding matrix may be selected sequentially from a codebook, for example, from table 3:
One approach is to select the vectors corresponding to different codewords sequentially to apply to different tiles or to select codewords randomly, in principle trying to traverse all codewords.
One solution for the mapping unit is to map in a bundle unit, and encode the modulated control symbol in fig. 2 by placing data on REGs numbered 1,2, and 3 of the first symbol REG and then placing data on REGs numbered 1,2, and 3 of the second OFDM symbol REG. For this way the terminal has the opportunity to blindly detect the control channel with the small aggregation level as soon as possible.
In another transmission method, the terminal and the base station perform beam training to obtain the preferred beam of the terminal, and transmit the control channel in a localized mapping mode and a closed-loop beamforming mode.
A L1 in the control channel transmission is considered to be a low aggregation level, A L8 is considered to be a high aggregation level, A L2 and A L4 are medium aggregation levels, based on which the aggregation levels and bundle size can be as follows:
1) A L1, A L2, A L4 for one bundle size 2, A L8 for bundle size 3
2) A L1, A L2, A L4 for bundle size 2, A L8 for bundle size 6;
3) A L1, A L2, A L4 for bundle size 3, A L8 for bundle size 6;
4) A L1, A L2 for bundle size 2, A L4, A L8 for bundle size 3;
5) A L1, A L2 for bundle size 3, A L4, A L8 for bundle size 6;
6) A L1, A L2 corresponds to bundle size3 and A L4, 4A L8, 8 corresponds to bundle size 6.
Claims (1)
1. A method for transmitting a control channel, comprising the steps of:
1) The pilot frequency used for demodulating the control channel and the control channel adopt the same precoding;
2) The control channel adopts a diversity transmission mode;
3) The control channels are scattered over the frequency domain resources;
4) The frequency domain is scattered according to a granularity;
5) The scattering particle size changes with different polymerization degrees;
6) The pilot frequency density changes along with the change of the polymerization degree;
The relation between the scattering particle size and different polymerization degrees specifically comprises the following steps: the high polymerization grade has large breaking particle size; the low polymerization grade has small scattering particle size;
2.1, after the connection is established between the terminal and the base station, performing initial beam selection, wherein the moving speed of the terminal is slow, namely the moving speed is lower than 30kmph, and the terminal is not positioned at the edge of a cell; in this case, the terminal and the beam transmit data including service and control data in a beamforming manner;
The base station configures resources of a control channel, including: controlling time-frequency resources of a channel, controlling aggregation level of the channel, controlling bit number of original data of the channel and controlling a transmission mechanism of the channel;
The frequency domain resources of the control channel comprise a frequency domain starting position and bandwidth, and the time domain resources comprise a starting OFDM symbol of the control channel and duration of the control channel;
The original bit number of the control message is 26, the length of the cyclic redundancy check code is 24, and the number of REs occupied by the time-frequency resources of the control channel is calculated as follows:
nRE _ perREG, where nRE is the number of resource groups corresponding to the bandwidth occupied by the control channel, nRE _ perREG is the number of pilots of each REG, and the aggregation level is 1, that is, the number of control channel elements occupied by one control channel is 1, and 1 control channel element includes 6 REGs;
In a word, the terminal and the base station carry out beam training, and the base station adopts accurate beams to carry out transmission of a control channel; the resource mapping mode of the control channel is a local mode, and the base station schedules the control message in the preferred sub-band for the transmission of the control message;
2.2, after the connection between the terminal and the base station is established, the initial beam selection is carried out, and the moving speed of the terminal is high, namely the moving speed is higher than 350kmph, and an open-loop transmission mechanism is adopted;
The base station configures resources of a control channel, including: controlling time-frequency resources of a channel, controlling aggregation level of the channel, controlling bit number of original data of the channel and controlling a transmission mechanism of the channel;
The frequency domain resources of the control channel comprise a frequency domain starting position and bandwidth, and the time domain resources comprise a starting OFDM symbol of the control channel and duration of the control channel; the aggregation level of the control channel is to realize the self-adaptive transmission of different channel environments by adopting a beam rotation training mode; a distributed resource allocation mode is adopted on resources, and a larger aggregation level is adopted;
The original bit number of the control message is 40, and the length of the cyclic redundancy check code is 24, then the number of resources occupied by the time-frequency resources of the control channel is calculated as follows:
nRE _ perREG, where nRE is the number of REGs corresponding to the bandwidth occupied by the control channel, nRE _ perREG is the number of pilots of each REG, and the aggregation level adopted is 4;
In a word, when the channel state information of the terminal and the base station is unavailable, the base station adopts a beam rotation training mechanism and adopts a distributed resource mapping mode;
The relationship between the pilot frequency density and the degree of polymerization specifically includes: low polymerization grade pilot frequency density is obtained; the pilot frequency density of the high aggregation level is sparse;
3.1 after the identification of the channel Doppler and multipath conditions, the channel environment identification unit realizes the measurement of the path loss through the detection signal to determine the preferred aggregation level for controlling the channel transmission; namely, the coverage of the terminal control channel with large path loss is transmitted by adopting a mode with large polymerization degree, and the polymerization degree is selected to be 4 or 8;
The time domain and frequency domain density of the pilot frequency and the polymerization degree of the transmission control channel can be determined through the measured value and the table look-up;
Further, the selection of the pilot density ensures that the frequency domain density meets the description of the frequency-selective channel on one hand, and on the other hand, the equalization process of channel estimation requires that the pilot sampling point meets certain requirements, different pilot density lower limits need to be set for different bundling scales, and the pilot density of channel interpolation is further determined while meeting the frequency selection density, generally speaking, the value of the RSD _ BSx pilot density value is greater than or equal to the frequency domain density of the RSD _ f pilot; searching corresponding pilot frequency density according to the value of the bundling scale; the pilot density is: RSD3 ═ max (RSD _ BSx, RSD _ f);
The precoding unit precodes the control message, and the base station selects a plurality of code words in a codebook to apply to a control channel of the terminal and a corresponding demodulation pilot frequency;
The control channel bandwidth BW _ ctrl configured by the terminal is 24 REGs, the time domain width is 2 OFDM symbols, and the total REG number is 48;
Resource allocation of control channel: each continuous 6 REG frames corresponds to a same pre-coding matrix, the 6 REGs are a bundle, and the pre-coding matrices are sequentially selected from the codebook; sequentially selecting vectors corresponding to different code words to be applied to different bundles, or randomly selecting the code words, wherein the principle is that all the code words are traversed as much as possible;
For the mapping unit: or mapping by taking bundling as a unit, placing data on the REG with the number of 1,2 and 3 of the first symbol REG and then placing data on the REG with the number of 1,2 and 3 of the second OFDM symbol after the code modulation control symbol; or the terminal and the base station carry out beam training, the base station acquires the preferred beam of the terminal, and the control channel is transmitted in a local mapping mode and a closed-loop beam forming mode;
configuration of aggregation level and bundle size A L1 in control channel transmission is considered as low aggregation level, A L8 is considered as high aggregation level, A L2 and A L4 are medium aggregation levels, configuration of aggregation level and bundle size is as follows:
1) A L1, A L2, A L4 for one bundle size 2, A L8 for bundle size 3;
2) A L1, A L2, A L4 for bundle size 2, A L8 for bundle size 6;
3) A L1, A L2, A L4 for bundle size 3, A L8 for bundle size 6;
4) A L1, A L2 for bundle size 2, A L4, A L8 for bundle size 3;
5) A L1, A L2 for bundle size 3, A L4, A L8 for bundle size 6;
6) A L1, A L2 corresponds to bundle size3, A L4, A L8 corresponds to bundle size 6.
Priority Applications (1)
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