Reference signal transmission method and device

Abstract

The invention provides a reference signal transmission method and device, relates to the technical field of communication, and is used for improving the reliability and efficiency of information transmission. The method comprises: for a channel measurement reference signal to be sent on a time domain symbol of a wireless frame in a time domain, mapping the channel measurement reference signal to X subcarriers of a corresponding carrier in a frequency domain, the carrier being composed of continuous 157 subcarriers, and the X being less than or equal to 157; and sending the channel measurement reference signal on the X subcarriers through a target antenna port.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of communication technology, and in particular to a reference signal transmission method and device. BACKGROUND

[0002] At present, most of the wireless communication systems such as cellular and short-range systems adopt orthogonal frequency-division multiplexing (OFDM) and multiple-input multiple-output (MIMO) technologies. The OFDM modulation mode can effectively resist multipath interference and reduce the influence of frequency selective fading. The MIMO multi-antenna technology can significantly improve the system capacity and enhance the reliability of data transmission.

[0003] In order to measure the wireless channel quality or channel state information (CSI), the two parties of the communication in the wireless communication system can send reference signals (RS) to each other at their respective antenna ports. The reference signals carry the CSI between the antenna ports of the two parties after being transmitted through the wireless channel. In this way, the device receiving the reference signal (or called receiving device) can measure the CSI through the reference signal, and adjust and optimize the communication process according to the channel measurement result, or extract key information from the channel measurement result and feed back to the device sending the reference signal (or called sending device).

[0004] In the above-mentioned reference signal sending process, how to reasonably design the time-frequency resource mapping mode of the reference signal to ensure that the receiving device can distinguish the different antenna ports of the sending device and improve the reliability and efficiency of information transmission is a technical problem to be solved. SUMMARY

[0005] The present application provides a reference signal transmission method and device for improving the reliability and efficiency of information transmission and improving the system performance.

[0006] To achieve the above-mentioned purpose, the embodiments of the present application adopt the following technical solutions:

[0007] In a first aspect, a reference signal transmission method is provided. The method comprises: for a channel measurement reference signal to be transmitted on one time domain symbol of one radio frame in time domain, mapping the channel measurement reference signal onto X subcarriers of a corresponding carrier in frequency domain, wherein the carrier is composed of 157 continuous subcarriers, and X is less than or equal to 157; and transmitting the channel measurement reference signal on the X subcarriers through a target antenna port. Optionally, a channel bandwidth of the carrier is 20 MHz, a width of each of the 157 subcarriers is 120 kHz, and a corresponding subcarrier spacing is also 120 kHz.

[0008] In the above technical solution, for a channel measurement reference signal to be transmitted on one time domain symbol of one radio frame in time domain, the channel measurement reference signal is mapped onto X subcarriers of a corresponding carrier in frequency domain, the carrier is composed of 157 continuous subcarriers, and X is less than or equal to 157, and then the channel measurement reference signal is transmitted on the X subcarriers through a target antenna port. In this way, the channel measurement reference signal can be mapped onto and transmitted on a carrier composed of a larger number of subcarriers. The more subcarriers a carrier includes, the smaller the subcarrier width and subcarrier spacing, and the smaller the influence of frequency selective fading. Therefore, the above technical solution can ensure the reliability and efficiency of information transmission and improve system performance.

[0009] In a possible implementation of the first aspect, the channel measurement reference signal comprises a channel state information reference signal (CSI-RS) or a sounding reference signal (SRS). In the above possible implementation, the channel state information reference signal (CSI-RS) or the sounding reference signal (SRS) can be mapped onto and transmitted on a carrier composed of 157 subcarriers, thereby ensuring the reliability and efficiency of information transmission and improving system performance.

[0010] In a possible implementation of the first aspect, the 157 subcarriers of the carrier are sequentially indexed as 0 to 156 in order of frequency from low to high, wherein a subcarrier with an index of 78 is a direct current subcarrier, and the other subcarriers are all valid subcarriers. Optionally, a value mapped on the direct current subcarrier is 0. In the above possible implementation, the channel measurement reference signal can be mapped onto and transmitted on a carrier composed of 157 subcarriers, thereby ensuring the reliability and efficiency of information transmission and improving system performance.

[0011] In a possible implementation of the first aspect, mapping the channel measurement reference signal onto X subcarriers of a corresponding carrier comprises: mapping the channel measurement reference signal onto each valid subcarrier of the 157 subcarriers of the carrier. Optionally, a complex value of the channel measurement reference signal mapped on each valid subcarrier of the 157 subcarriers satisfies: k is equal to 0, 1, 2, 3, …, 156; wherein, n represents the index of the radio frame, 1 represents the index of the time domain symbol, k represents the index of the corresponding subcarrier, r n，l (k) represents the kth value in the pseudo-random sequence of the channel measurement reference signal, i represents the index of the target antenna port, represents the complex value of the channel measurement reference signal mapped on the kth subcarrier. In the possible implementation manner, the channel measurement reference signal is mapped to each of the 52 valid subcarriers in the 157 subcarriers of the carrier, so as to guarantee the reliability and efficiency of information transmission and improve the system performance.

[0012] In a possible implementation manner of the first aspect, the mapping of the channel measurement reference signal to the X subcarriers of the corresponding carrier includes: mapping the channel measurement reference signal to 52 valid subcarriers in the 157 subcarriers of the carrier, the 52 valid subcarriers being the subcarriers with indexes k being 0, 3, 6, 9, …, 75, 79, 82, 85, …, 154 in the 157 subcarriers. Optionally, the complex value of the channel measurement reference signal mapped on each of the 52 valid subcarriers satisfies: k is equal to 0, 1, 2, 3, …, 156; wherein, n represents the index of the radio frame, 1 represents the index of the time domain symbol, k represents the index of the corresponding subcarrier, r n , (k) represents the kth value in the pseudo-random sequence of the channel measurement reference signal, i represents the index of the target antenna port, RS represents the power factor of the channel measurement reference signal, represents the complex value of the channel measurement reference signal mapped on the kth subcarrier. In the possible implementation manner, the channel measurement reference signal can be mapped to 52 valid subcarriers in the 157 subcarriers of the carrier, so as to reduce the time-frequency resource overhead of the channel measurement reference signal while guaranteeing the channel measurement performance, that is, to balance the channel measurement performance and the time-frequency resource overhead.

[0013] In a possible implementation manner of the first aspect, the mapping of the channel measurement reference signal to the X subcarriers of the corresponding carrier includes: mapping the channel measurement reference signal to 52 valid subcarriers in the 157 subcarriers of the carrier, the 52 valid subcarriers being the subcarriers with indexes k being 1, 4, 7, …, 76, 80, 83, 86, …, 155 in the 157 subcarriers. Optionally, the complex value of the channel measurement reference signal mapped on each of the 52 valid subcarriers satisfies: k is equal to 1, 4, 7, …, 76, 80, 83, 86, …, 155; wherein, n represents the index of the radio frame, l represents the index of the time domain symbol, k represents the index of the corresponding subcarrier, r n l(k) represents the kth value in the pseudo-random sequence of the channel measurement reference signal, i represents the index of the target antenna port, a RS represents the power factor of the channel measurement reference signal, represents the complex value of the channel measurement reference signal mapped on the kth subcarrier. In the possible implementation manner, the channel measurement reference signal can be mapped to 52 effective subcarriers in the 157 subcarriers of the carrier, so as to reduce the time-frequency resource overhead of the channel measurement reference signal while ensuring the channel measurement performance, that is, to balance the channel measurement performance and the time-frequency resource overhead.

[0014] In a possible implementation manner of the first aspect, mapping the channel measurement reference signal to X subcarriers of the corresponding carrier comprises: mapping the channel measurement reference signal to 52 effective subcarriers in the 157 subcarriers of the carrier, the 52 effective subcarriers being subcarriers with indexes k being 2, 5, 8, …, 77, 81, 84, 87, …, 156 in the 157 subcarriers. Optionally, the complex value of the channel measurement reference signal mapped on each of the 52 effective subcarriers satisfies: k is equal to 2, 5, 8, …, 77, 81, 84, 87, …, 156; wherein, n represents the index of the radio frame, l represents the index of the time domain symbol, k represents the index of the corresponding subcarrier, r n l(k) represents the kth value in the pseudo-random sequence of the channel measurement reference signal, i represents the index of the target antenna port, a RS represents the power factor of the channel measurement reference signal, represents the complex value of the channel measurement reference signal mapped on the kth subcarrier. In the possible implementation manner, the channel measurement reference signal can be mapped to 52 effective subcarriers in the 157 subcarriers of the carrier, so as to reduce the time-frequency resource overhead of the channel measurement reference signal while ensuring the channel measurement performance, that is, to balance the channel measurement performance and the time-frequency resource overhead.

[0015] In a possible implementation of the first aspect, the mapping the channel measurement reference signal to X subcarriers of the corresponding carrier comprises: mapping the channel measurement reference signal to 78 valid subcarriers of 157 subcarriers of the carrier, the 78 valid subcarriers being subcarriers with indexes k being 0, 2, 4, …, 76, 79, 81, 83, …, 155 of the 157 subcarriers. Optionally, a complex value of the channel measurement reference signal mapped on each of the 52 valid subcarriers satisfies: k is equal to 0, 2, 4, …, 76, 79, 81, 83, …, 155; wherein n represents an index of the radio frame, l represents an index of the time domain symbol, k represents an index of the corresponding subcarrier, r n , l(k) represents a k th value in a pseudo-random sequence of the channel measurement reference signal, i represents an index of the target antenna port, a RS represents a power factor of the channel measurement reference signal, represents a complex value of the channel measurement reference signal mapped on the k th subcarrier. In the possible implementation, the channel measurement reference signal is mapped to the 78 valid subcarriers of the 157 subcarriers of the carrier, so that the time-frequency resource overhead of the channel measurement reference signal is reduced while the channel measurement performance is ensured, that is, the channel measurement performance and the time-frequency resource overhead are taken into account.

[0016] In a possible implementation of the first aspect, the mapping the channel measurement reference signal to X subcarriers of the corresponding carrier comprises: mapping the channel measurement reference signal to 78 valid subcarriers of 157 subcarriers of the carrier, the 78 valid subcarriers being subcarriers with indexes k being 1, 3, 5, …, 77, 80, 82, 84, …, 156 of the 157 subcarriers. Optionally, a complex value of the channel measurement reference signal mapped on each of the 52 valid subcarriers satisfies: k is equal to 1, 3, 5, …, 77, 80, 82, 84, …, 156; wherein n represents an index of the radio frame, l represents an index of the time domain symbol, k represents an index of the corresponding subcarrier, r n , l(k) represents a k th value in a pseudo-random sequence of the channel measurement reference signal, i represents an index of the target antenna port, a RS represents a power factor of the channel measurement reference signal, represents a complex value of the channel measurement reference signal mapped on the k th subcarrier. In the possible implementation, the channel measurement reference signal is mapped to the 78 valid subcarriers of the 157 subcarriers of the carrier, so that the time-frequency resource overhead of the channel measurement reference signal is reduced while the channel measurement performance is ensured, that is, the channel measurement performance and the time-frequency resource overhead are taken into account.

[0017] In a possible implementation of the first aspect, the α RS is equal to 1, or The possible implementation can improve the power of the channel measurement reference signal, thereby facilitating the channel measurement.

[0018] In a second aspect, a reference signal transmission method is provided. The method comprises: receiving high layer signaling or physical layer control information, the high layer signaling or the physical layer control information comprising target configuration information, the target configuration information being used to indicate a mapping manner of a channel measurement reference signal to be transmitted on one time domain symbol of one radio frame in a time domain on a frequency domain, the mapping manner being one of a plurality of candidate mapping manners; mapping the channel measurement reference signal to X subcarriers of a corresponding carrier according to the mapping manner indicated by the target configuration information, wherein the carrier is composed of 157 continuous subcarriers, and the X is less than or equal to 157; and transmitting the channel measurement reference signal on the X subcarriers through a target antenna port.

[0019] In the above technical solution, the channel measurement reference signal can be mapped to and transmitted on a carrier composed of a larger number of subcarriers, thereby improving the system performance while ensuring the reliability and efficiency of information transmission. In addition, the mapping manner of the channel measurement reference signal on the frequency domain can be indicated by the target configuration information in the high layer signaling or the physical layer control information, and the mapping manner indicated by the target configuration information can be one of a plurality of candidate mapping manners. Thus, the plurality of candidate mapping manners and the mapping manner indicated by the target configuration information can be flexibly configured according to actual needs in actual application, thereby realizing flexible switching of different mapping manners.

[0020] In a possible implementation of the second aspect, the channel measurement reference signal comprises: a channel state information reference signal (CSI-RS) or a sounding reference signal (SRS).

[0021] In a possible implementation of the second aspect, the 157 subcarriers of the carrier are sequentially numbered and indexed from 0 to 156 in the order of frequency from low to high, wherein the subcarrier with index 78 is a direct current subcarrier, and the other subcarriers are all valid subcarriers. Optionally, the value mapped on the direct current subcarrier is 0.

[0022] In a possible implementation of the second aspect, the target configuration information occupies 1 bit, and the number of the plurality of candidate mapping manners is two; or the target configuration information occupies 2 bits, and the number of the plurality of candidate mapping manners is three or four; or the target configuration information occupies 3 bits, and the number of the plurality of candidate mapping manners is five or six.

[0023] In a possible implementation of the second aspect, the plurality of candidate mapping manners comprises at least two of the following: a first mapping manner indicating that the channel measurement reference signal is mapped on each of the 157 subcarriers of the carrier; a second mapping manner indicating that the channel measurement reference signal is mapped on 52 of the 157 subcarriers of the carrier, the 52 subcarriers being subcarriers with indexes k being 0, 3, 6, 9, …, 75, 79, 82, 85, …, 154 among the 157 subcarriers; a third mapping manner indicating that the channel measurement reference signal is mapped on 52 of the 157 subcarriers of the carrier, the 52 subcarriers being subcarriers with indexes k being 1, 4, 7, …, 76, 80, 83, 86, …, 155 among the 157 subcarriers; a fourth mapping manner indicating that the channel measurement reference signal is mapped on 52 of the 157 subcarriers of the carrier, the 52 subcarriers being subcarriers with indexes k being 2, 5, 8, …, 77, 81, 84, 87, …, 156 among the 157 subcarriers; a fifth mapping manner indicating that the channel measurement reference signal is mapped on 78 of the 157 subcarriers of the carrier, the 78 subcarriers being subcarriers with indexes k being 0, 2, 4, …, 76, 79, 81, 83, …, 155 among the 157 subcarriers; and a sixth mapping manner indicating that the channel measurement reference signal is mapped on 78 of the 157 subcarriers of the carrier, the 78 subcarriers being subcarriers with indexes k being 1, 3, 5, …, 77, 80, 82, 84, …, 156 among the 157 subcarriers.

[0024] In a possible implementation of the second aspect, when the mapping manner indicated by the target configuration information is the first mapping manner, the complex value of the channel measurement reference signal mapped on each of the 157 subcarriers satisfies: k is equal to 0, 1, 2, 3, …, 156; when the mapping manner indicated by the target configuration information is the second mapping manner, the complex value of the channel measurement reference signal mapped on each of the 52 subcarriers satisfies: k is equal to 0, 3, 6, 9, …, 75, 79, 82, 85, …, 154; when the mapping manner indicated by the target configuration information is the third mapping manner, the complex value of the channel measurement reference signal mapped on each of the 52 subcarriers satisfies: r nl(k), k equals 1, 4, 7,..., 76, 80, 83, 86,..., 155; when the mapping manner indicated by the target configuration information is the fourth mapping manner, the complex value of the channel measurement reference signal mapped on each of the 52 valid subcarriers satisfies: k equals 2, 5, 8,..., 77, 81, 84, 87,..., 156; when the mapping manner indicated by the target configuration information is the fifth mapping manner, the complex value of the channel measurement reference signal mapped on each of the 78 valid subcarriers satisfies: k equals 0, 2, 4,..., 76, 79, 81, 83,..., 155; when the mapping manner indicated by the target configuration information is the sixth mapping manner, the complex value of the channel measurement reference signal mapped on each of the 52 valid subcarriers satisfies: k equals 1, 3, 5,..., 77, 80, 82, 84,..., 156; where n represents the index of the radio frame, l represents the index of the time domain symbol, k represents the index of the corresponding subcarrier, r n l(k) represents the kth value in the pseudo-random sequence of the channel measurement reference signal, i represents the index of the target antenna port, a RS represents the power factor of the channel measurement reference signal, represents the complex value of the channel measurement reference signal mapped on the kth subcarrier.

[0025] In a possible implementation of the second aspect, the a RS equals 1, or

[0026] In a third aspect, a reference signal transmission apparatus is provided, comprising: a processing unit, configured to map, in the frequency domain, a channel measurement reference signal to X subcarriers of a corresponding carrier in the frequency domain, where the carrier is composed of 157 consecutive subcarriers, and the X is less than or equal to 157, for the channel measurement reference signal to be transmitted on one time domain symbol of one radio frame in the time domain; and a transmitting unit, configured to transmit the channel measurement reference signal on the X subcarriers through a target antenna port. Optionally, the channel bandwidth of the carrier is 20 MHz, the width of each of the 157 subcarriers is 120 kHz, and the corresponding subcarrier spacing is also 120 kHz.

[0027] In a possible implementation of the third aspect, the channel measurement reference signal comprises: a channel state information reference signal (CSI-RS) or a sounding reference signal (SRS).

[0028] In a possible implementation form of the third aspect, the 157 subcarriers of the carrier are sequentially indexed from 0 to 156 in order of frequency from low to high, wherein a subcarrier with index 78 is a direct current subcarrier, and other subcarriers are valid subcarriers. Optionally, a value mapped on the direct current subcarrier is 0.

[0029] In a possible implementation form of the third aspect, the processing unit is further configured to map the channel measurement reference signal on each valid subcarrier of the 157 subcarriers of the carrier. Optionally, a complex value of the channel measurement reference signal mapped on each valid subcarrier of the 157 subcarriers satisfies: k is equal to 0, 1, 2, 3, …, 156; wherein n represents an index of the radio frame, l represents an index of the time domain symbol, k represents an index of a corresponding subcarrier, r n , l(k) represents a k-th value in a pseudo-random sequence of the channel measurement reference signal, i represents an index of the target antenna port, represents a complex value of the channel measurement reference signal mapped on the k-th subcarrier.

[0030] In a possible implementation form of the third aspect, the processing unit is further configured to map the channel measurement reference signal on 52 valid subcarriers of the 157 subcarriers of the carrier, the 52 valid subcarriers being subcarriers with index k being 0, 3, 6, 9, …, 75, 79, 82, 85, …, 154 of the 157 subcarriers. Optionally, a complex value of the channel measurement reference signal mapped on each valid subcarrier of the 52 valid subcarriers satisfies: k is equal to 0, 3, 6, 9, …, 75, 79, 82, 85, …, 154; wherein n represents an index of the radio frame, l represents an index of the time domain symbol, k represents an index of a corresponding subcarrier, r n , l(k) represents a k-th value in a pseudo-random sequence of the channel measurement reference signal, i represents an index of the target antenna port, a RS represents a power factor of the channel measurement reference signal, represents a complex value of the channel measurement reference signal mapped on the k-th subcarrier.

[0031] In a possible implementation form of the third aspect, the processing unit is further configured to map the channel measurement reference signal on 52 valid subcarriers of the 157 subcarriers of the carrier, the 52 valid subcarriers being subcarriers with index k being 1, 4, 7, …, 76, 80, 83, 86, …, 155 of the 157 subcarriers. Optionally, a complex value of the channel measurement reference signal mapped on each valid subcarrier of the 52 valid subcarriers satisfies: k is equal to 1, 4, 7, …, 76, 80, 83, 86, …, 155; wherein, n represents the index of the radio frame, l represents the index of the time domain symbol, k represents the index of the corresponding subcarrier, r n l(k) represents the kth value in the pseudo-random sequence of the channel measurement reference signal, i represents the index of the target antenna port, a RS represents the power factor of the channel measurement reference signal, represents the complex value of the channel measurement reference signal mapped on the kth subcarrier.

[0032] In a possible implementation of the third aspect, the processing unit is further configured to: map the channel measurement reference signal on 52 valid subcarriers of 157 subcarriers of the carrier, the 52 valid subcarriers being subcarriers of the 157 subcarriers with indexes k being 2, 5, 8, …, 77, 81, 84, 87, …, 156. Optionally, the complex value of the channel measurement reference signal mapped on each of the 52 valid subcarriers satisfies: k is equal to 2, 5, 8, …, 77, 81, 84, 87, …, 156; wherein, n represents the index of the radio frame, l represents the index of the time domain symbol, k represents the index of the corresponding subcarrier, r n l(k) represents the kth value in the pseudo-random sequence of the channel measurement reference signal, i represents the index of the target antenna port, a RS represents the power factor of the channel measurement reference signal, represents the complex value of the channel measurement reference signal mapped on the kth subcarrier.

[0033] In a possible implementation of the third aspect, the processing unit is further configured to: map the channel measurement reference signal on 78 valid subcarriers of 157 subcarriers of the carrier, the 78 valid subcarriers being subcarriers of the 157 subcarriers with indexes k being 0, 2, 4, …, 76, 79, 81, 83, …, 155. Optionally, the complex value of the channel measurement reference signal mapped on each of the 78 valid subcarriers satisfies: k is equal to 0, 2, 4, …, 76, 79, 81, 83, …, 155; wherein, n represents the index of the radio frame, l represents the index of the time domain symbol, k represents the index of the corresponding subcarrier, r n l(k) represents the kth value in the pseudo-random sequence of the channel measurement reference signal, i represents the index of the target antenna port, a RS represents the power factor of the channel measurement reference signal, represents the complex value of the channel measurement reference signal mapped on the kth subcarrier.

[0034] In a possible implementation form of the third aspect, the processing unit is further configured to map the channel measurement reference signal on 78 valid subcarriers of 157 subcarriers of the carrier, the 78 valid subcarriers being subcarriers with indexes k being 1, 3, 5, …, 77, 80, 82, 84, …, 1566 of the 157 subcarriers. Optionally, the complex value of the channel measurement reference signal mapped on each of the 52 valid subcarriers satisfies: k equals to 1, 3, 5, …, 77, 80, 82, 84, …, 156; wherein n represents an index of the radio frame, l represents an index of the time domain symbol, k represents an index of the corresponding subcarrier, r n , l(k) represents a kth value in a pseudo-random sequence of the channel measurement reference signal, i represents an index of the target antenna port, a RS represents a power factor of the channel measurement reference signal, represents a complex value of the channel measurement reference signal mapped on the kth subcarrier.

[0035] In a possible implementation form of the third aspect, the a RS equals to 1, or

[0036] In a fourth aspect, a reference signal transmission apparatus is provided, comprising: a receiving unit, configured to receive high layer signaling or physical layer control information, the high layer signaling or the physical layer control information comprising target configuration information, the target configuration information being used to indicate a mapping manner of a channel measurement reference signal to be transmitted on one time domain symbol of one radio frame in a time domain in a frequency domain, the mapping manner being one of a plurality of candidate mapping manners; a processing unit, configured to map the channel measurement reference signal on X subcarriers of a corresponding carrier according to the mapping manner indicated by the target configuration information, wherein the carrier is composed of 157 continuous subcarriers, and the X is less than or equal to 157; and a sending unit, configured to send the channel measurement reference signal on the X subcarriers through a target antenna port.

[0037] In a possible implementation form of the fourth aspect, the channel measurement reference signal comprises a channel state information reference signal (CSI-RS) or a sounding reference signal (SRS).

[0038] In a possible implementation form of the fourth aspect, the 157 subcarriers of the carrier are sequentially numbered as 0 to 156 in a frequency from low to high order, wherein a subcarrier with an index of 78 is a direct current subcarrier, and other subcarriers are valid subcarriers. Optionally, a value mapped on the direct current subcarrier is 0.

[0039] In a possible implementation form of the fourth aspect, the target configuration information occupies 1 bit, and the number of the plurality of candidate mapping manners is two; or the target configuration information occupies 2 bits, and the number of the plurality of candidate mapping manners is three or four; or the target configuration information occupies 3 bits, and the number of the plurality of candidate mapping manners is five or six.

[0040] In a possible implementation form of the fourth aspect, the plurality of candidate mapping manners comprises at least two of the following: a first mapping manner indicating that the channel measurement reference signal is mapped on each of the 157 subcarriers of the carrier; a second mapping manner indicating that the channel measurement reference signal is mapped on 52 valid subcarriers of the 157 subcarriers of the carrier, the 52 valid subcarriers being subcarriers with indexes k being 0, 3, 6, 9, …, 75, 79, 82, 85, …, 154 among the 157 subcarriers; a third mapping manner indicating that the channel measurement reference signal is mapped on 52 valid subcarriers of the 157 subcarriers of the carrier, the 52 valid subcarriers being subcarriers with indexes k being 1, 4, 7, …, 76, 80, 83, 86, …, 155 among the 157 subcarriers; a fourth mapping manner indicating that the channel measurement reference signal is mapped on 52 valid subcarriers of the 157 subcarriers of the carrier, the 52 valid subcarriers being subcarriers with indexes k being 2, 5, 8, …, 77, 81, 84, 87, …, 156 among the 157 subcarriers; a fifth mapping manner indicating that the channel measurement reference signal is mapped on 78 valid subcarriers of the 157 subcarriers of the carrier, the 78 valid subcarriers being subcarriers with indexes k being 0, 2, 4, …, 76, 79, 81, 83, …, 155 among the 157 subcarriers; and a sixth mapping manner indicating that the channel measurement reference signal is mapped on 78 valid subcarriers of the 157 subcarriers of the carrier, the 78 valid subcarriers being subcarriers with indexes k being 1, 3, 5, …, 77, 80, 82, 84, …, 156 among the 157 subcarriers.

[0041] In a possible implementation form of the fourth aspect, when the mapping manner indicated by the target configuration information is the first mapping manner, the complex value of the channel measurement reference signal mapped on each of the 157 subcarriers satisfies: When the mapping manner indicated by the target configuration information is the second mapping manner, the complex value of the channel measurement reference signal mapped on each of the 52 valid subcarriers satisfies: k is equal to 0, 3, 6, 9, …, 75, 79, 82, 85, …, 154; when the mapping manner indicated by the target configuration information is the third mapping manner, the complex value of the channel measurement reference signal mapped on each of the 52 valid subcarriers satisfies: k is equal to 1, 4, 7, …, 76, 80, 83, 86, …, 155; when the mapping manner indicated by the target configuration information is the fourth mapping manner, the complex value of the channel measurement reference signal mapped on each of the 52 valid subcarriers satisfies: k is equal to 2, 5, 8, …, 77, 81, 84, 87, …, 156; when the mapping manner indicated by the target configuration information is the fifth mapping manner, the complex value of the channel measurement reference signal mapped on each of the 78 valid subcarriers satisfies: k is equal to 0, 2, 4, …, 76, 79, 81, 83, …, 155; when the mapping manner indicated by the target configuration information is the sixth mapping manner, the complex value of the channel measurement reference signal mapped on each of the 78 valid subcarriers satisfies: k is equal to 1, 3, 5, …, 77, 80, 82, 84, …, 156; wherein n represents the index of the radio frame, l represents the index of the time domain symbol, k represents the index of the corresponding subcarrier, r n , l(k) represents the kth value in the pseudo-random sequence of the channel measurement reference signal, i represents the index of the target antenna port, and RS represents the power factor of the channel measurement reference signal, represents the complex value of the channel measurement reference signal mapped on the kth subcarrier.

[0042] In a possible implementation manner of the fourth aspect, the RS is equal to 1, or

[0043] In a fifth aspect, a reference signal transmission apparatus is provided, which comprises a processor and a memory, the memory storing instructions which, when executed by the processor, cause the apparatus to perform the reference signal transmission method provided in the first aspect or any possible implementation manner of the first aspect, or perform the reference signal transmission method provided in the second aspect or any possible implementation manner of the second aspect.

[0044] In a sixth aspect, a wireless communication system is provided, the wireless communication system comprising a wireless access device and a terminal device, the wireless access device or the terminal device comprising the reference signal transmission apparatus provided in any one of the third aspect to the fifth aspect or any possible implementation of the third aspect to the fifth aspect.

[0045] In yet another aspect of the present application, a computer readable storage medium is provided, the computer readable storage medium storing instructions which, when executed, implement the method provided in the first aspect or any possible implementation of the first aspect, or implement the method provided in the second aspect or any possible implementation of the second aspect.

[0046] In yet another aspect of the present application, a computer program product is provided, the computer program product comprising: a computer program (which can also be referred to as codes or instructions) which, when executed by a computer, causes the computer to perform the method provided in the first aspect or any possible implementation of the first aspect, or perform the method provided in the second aspect or any possible implementation of the second aspect.

[0047] It can be understood that the beneficial effects of the other aspects except the first aspect and any possible implementation of the first aspect can be correspondingly referred to the beneficial effects of the first aspect and any possible implementation of the first aspect, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0048] Figure 1 A schematic diagram of a time-frequency resource provided for an embodiment of the present application;

[0049] Figure 2 A schematic diagram of a structure of a wireless communication system provided for an embodiment of the present application;

[0050] Figure 3 A schematic diagram of a structure of a wireless communication device provided for an embodiment of the present application;

[0051] Figure 4 A schematic diagram of a flow of a reference signal transmission method provided for an embodiment of the present application;

[0052] Figure 5 A mapping diagram of a channel measurement reference signal provided for an embodiment of the present application;

[0053] Figure 6 Another mapping diagram of a channel measurement reference signal provided for an embodiment of the present application;

[0054] Figure 7 Yet another mapping diagram of a channel measurement reference signal provided for an embodiment of the present application;

[0055] Figure 8 Another mapping diagram of a channel measurement reference signal provided by an embodiment of the present application is shown in FIG. 6;

[0056] Figure 9 Another mapping diagram of a channel measurement reference signal provided by an embodiment of the present application is shown in FIG. 6;

[0057] Figure 10 Another mapping diagram of a channel measurement reference signal provided by an embodiment of the present application is shown in FIG. 6;

[0058] Figure 11 A flow diagram of another reference signal transmission method provided by an embodiment of the present application is shown in FIG. 7;

[0059] Figure 12 A structure diagram of a reference signal transmission apparatus provided by an embodiment of the present application is shown in FIG. 8;

[0060] Figure 13 A structure diagram of another reference signal transmission apparatus provided by an embodiment of the present application is shown in FIG. 8. DETAILED DESCRIPTION

[0061] The making and using of various embodiments are discussed in detail below. It should be appreciated that the specific embodiments discussed are merely illustrative of specific ways to make and use the application and this technology and do not limit the scope of the present application.

[0062] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art.

[0063] Circuits or other components can be described as or said to be "configured to" perform one or more tasks. In this context, "configured to" is used to mean that the circuit / component includes structure (e.g., circuitry) that performs the task(s) during operation. Thus, referring to a circuit / component that is "configured to" perform one or more tasks is something that the circuit / component can do and is not an action the circuit / component is taking at a particular moment or instance. In contrast, reciting a circuit / component that "performs" one or more tasks is an action that may

[0064] The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. In the present application, "at least one" means one or more, and "multiple" means two or more. The "and / or" describes the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can represent the following three cases: A exists alone, A and B exist together, and B exists alone, where A and B can be singular or plural. The character " / " generally represents an "or" relationship between the associated objects before and after it. "At least one of the following" or similar expressions means any combination of these items, including any combination of single item or multiple items. For example, at least one of a, b or c can represent a, b, c, a and b, a and c, b and c, a, b and c; where a, b and c can be single or multiple.

[0065] The embodiments of the present application use "first" and "second" and the like to distinguish objects with similar names or functions or roles. Those skilled in the art can understand that "first" and "second" and the like do not limit the quantity and execution order. In the present application, "exemplary" or "for example" is used to represent an example, illustration or description. Any embodiment or design scheme described as "exemplary" or "for example" in the present application should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. Rather, the use of "exemplary" or "for example" is intended to present the relevant concept in a specific manner.

[0066] Before introducing the embodiments of the present application, first, the related background involved in the present application is introduced and described.

[0067] At present, most of the wireless communication systems such as cellular and short-range systems adopt orthogonal frequency division multiplexing (OFDM) and multiple-input multiple-output (MIMO) technology. The OFDM debugging mode can effectively resist multipath interference and reduce the influence of frequency selective fading. The MIMO multi-antenna technology can significantly improve the system capacity and enhance the reliability of data transmission.

[0068] In order to measure the wireless channel quality or channel state information (CSI), the two parties of communication in a wireless communication system can send reference signals (RSs) to each other at their respective antenna ports, which carry the CSI between the respective antenna ports of the two parties after being transmitted through the wireless channel. In this way, the device receiving the reference signals (or the receiving device) can measure the CSI through the reference signals, and adjust and optimize the communication process according to the channel measurement results, or extract key information from the channel measurement results and feed back to the device sending the reference signals (or the sending device).

[0069] The above-mentioned reference signals can include the same or different reference signals in different wireless communication systems, such as channel state information reference signals (CSI-RSs) and sounding reference signals (SRSs) in cellular wireless communication standards such as 5G new radio (NR), and sounding physical layer protocol data units (PPDUs) in Wi-Fi wireless communication standards. For the convenience of description, the reference signals used for channel measurement in different communication systems can be collectively referred to as channel measurement reference signals in the embodiments of the present application.

[0070] In the above reference signal sending process, how to reasonably design the time-frequency resource mapping manner of the reference signal to ensure that the receiving device can distinguish different antenna ports of the sending device while improving the reliability and efficiency of information transmission is a technical problem that needs to be solved. In this application, the antenna port (antenna port) is also referred to as port, which is a logical concept, and each antenna port corresponds to a time-frequency resource grid and the reference signal carried. The transmission channel estimated by the reference signal on one symbol of the antenna port can infer the transmission channel experienced by another symbol on the same antenna port. One antenna port can correspond to one transmission link or an equivalent transmission link after combining multiple transmission links; or, one antenna port can correspond to one reception link or an equivalent reception link after combining multiple reception links. For example, an antenna port can be defined based on the following characteristics: the transmission channel of one symbol (or time domain symbol) on the antenna port can infer the transmission channel of another symbol on the same antenna port. In this application, the index of any antenna port in the plurality of antenna ports of the same device can be represented as i, which can take a value from 0, i.e. i = 0, 1, …, P-1, P is the total number of the plurality of antenna ports. In actual application, the number or index of the P antenna ports can also be arbitrarily valued, and the embodiments of the present application do not make specific limitations.

[0071] In the following, the star flash wireless communication system in the wireless communication system is taken as an example to introduce and illustrate the related content of the wireless communication system.

[0072] The star flash wireless communication technology is a new generation of short-range wireless communication technology with full-stack originality, and the related standards are formulated by the international star flash alliance (SparkLink Alliance). It provides two air interface access technologies: star flash basic access technology (SparkLink Basic, SLB) and star flash low power access technology (Sparklink Low Energy, SLE). Among them, the technical content of SLB is specified in the industry standard YD / T 4007-2022 "Wireless Short-Range Communication Vehicle Air Interface Technical Requirements and Test Methods". According to the different roles of the star flash standard access layer, the devices in the star flash wireless communication system can be divided into G (grant) nodes and T (terminal) nodes, for example, the G node can be called an access node or an access device, and the T node can be called a terminal node or a terminal device. Each G node can manage a certain number of T nodes, which together form a communication domain. Therefore, the star flash wireless communication system is also called a GT wireless communication system.

[0073] With the evolution and development of wireless communication technology, the frequency domain resource will be re-planned in the wireless communication technology standard, such as a carrier can be composed of a larger number of subcarriers. In one possible example, a carrier can be composed of 1200 subcarriers, and each subcarrier can carry a reference signal. Figure 1The resource planning shown as an example is as follows: Figure 1 As shown in (a) of FIG. 1, the time length of one superframe is 1 ms, and the superframe includes 8 radio frames numbered (or indexed) in time from front to back as 0, 1, …, 7. Figure 1 As shown in (b) of FIG. 1, the system bandwidth includes M carriers, and any one of the M carriers is composed of 157 continuous subcarriers numbered (or indexed) in frequency from low to high as 0, 1, …, 156, wherein the subcarrier with index 78 is called a direct current (DC) subcarrier, and the other 156 subcarriers except the DC subcarrier are called effective subcarriers. The channel bandwidth of the carrier is 20 MHz, the 157 subcarriers totally occupy 18.84 MHz, the width of each subcarrier is 120 kHz, the corresponding subcarrier spacing is also 120 kHz, and a certain bandwidth of guard band is arranged on both sides of the carrier, for example, a left guard band (480 / 640 / 800 kHz) is arranged on the left side and a right guard band (480 / 640 / 800 kHz) is arranged on the right side.

[0074] In this example, for each antenna port, a resource grid composed of 157 frequency domain subcarriers and N time domain symbols can be defined on each radio frame of each carrier, and N represents the number of time domain symbols included in a radio frame. Each unit in a resource grid of an antenna port with index p can be called a resource element (RE), and each resource element can be indexed by the unique serial number (k, l) p of the resource grid. Wherein k and l are indexes in the frequency domain and the time domain, respectively, that is, k is the index of the subcarrier in the frequency domain, and l is the index of the symbol in the time domain, k = 0, 1, …, 156, l = 0, 1, …, N-1.

[0075] Based on this, the embodiment of the present application provides a reference signal transmission method, which supports mapping a channel measurement reference signal to all or part of the subcarriers of a carrier composed of a larger number of subcarriers in the frequency domain for the channel measurement reference signal to be transmitted on one time domain symbol of a radio frame in the time domain. For example, the carrier is composed of 157 continuous subcarriers as shown in (b) of FIG. 1, and the channel measurement reference signal can be mapped to the 157 subcarriers, or to 52 effective subcarriers in the 157 subcarriers, or to 78 effective subcarriers in the 157 subcarriers. Figure 1

[0076] ​The technical scheme provided by the embodiments of the present application can be applied to a wireless communication system. For example, the wireless communication system can include, but is not limited to, a GT wireless communication system, a Wireless Fidelity (Wi-Fi) communication system, a cellular communication system, a Bluetooth communication system, a satellite communication system, a near field communication (NFC) system, a hybrid networking communication system, or a future communication system, etc. The above-mentioned wireless communication systems are used to more clearly illustrate the technical scheme of the embodiments of the present application, and do not constitute a limitation on the technical scheme provided by the embodiments of the present application. It can be known by those skilled in the art that, with the evolution of the communication system and the appearance of new application scenarios, the technical scheme provided by the embodiments of the present application is also applicable to similar technical problems.

[0077] It should be understood that in the wireless communication system, devices can be divided into devices providing wireless network services and devices using wireless network services. The above-mentioned devices providing wireless network services can also be referred to as network equipment or network elements, for example, the network equipment includes a wireless access device. The above-mentioned devices using wireless network services are usually located at the edge of the network and can be referred to as terminal devices or simply terminals. The terminal device can establish a connection with the network equipment and provide wireless communication services for users based on the services of the network equipment. In the following, the structure of the wireless communication system is illustrated by taking the wireless communication system including a wireless access device and a terminal device as an example.

[0078] Figure 2 A structure diagram of a wireless communication system provided by the embodiments of the present application is shown in the figure. The wireless communication system can include a wireless access device 10 and a terminal device 20. The terminal device 20 and the wireless access device 10 can perform wireless communication. In the wireless communication system, the wireless access device 10 can provide communication coverage for a specific geographic area through an integrated or externally connected antenna device. The terminal device 20 located in the communication coverage range of the wireless access device 10 can access the wireless access device 10 and perform communication with the wireless access device 10.

[0079] Optionally, the wireless access device 10 can include a base station, a wireless access point (AP), a G node, or a transmission reception point (TRP). Optionally, the base station can be a general Node B (gNB) in a 5G NR system, an evolutional Node B (eNB) in a 4G long term evolution (LTE) system, or the like. According to different physical forms or transmission powers of the base station, the base station can be classified as a macro base station or a micro base station, which can also be referred to as a small base station or a small cell.

[0080] In one possible example, the wireless communication system is a GT wireless communication system, the wireless access device 10 is a G node, and the terminal device 20 is a T node.

[0081] Optionally, the terminal device 20 can include, but is not limited to, a mobile phone, a tablet computer, a notebook computer, a desktop computer, a palm computer, an ultra-mobile personal computer (umPC), a mobile internet device (MID), a netbook, a video camera, a camera, a wearable device (such as a smart watch and a smart bracelet, etc.), a vehicle-mounted device (such as a car, a bicycle, an electric vehicle, an airplane, a ship, a train, a high-speed rail, etc.), a virtual reality (VR) device, an augmented reality (AR) device, a wireless terminal in industrial control, a smart home device (such as a refrigerator, a television, an air conditioner, an electric meter, etc.), a smart robot, a workshop device, a wireless terminal in self-driving, a wireless terminal in remote medical surgery, a wireless terminal in a smart grid, a wireless terminal in transportation safety, a wireless terminal in a smart city, or a wireless terminal in a smart home, a flight device (such as a smart robot, a hot air balloon, a drone, an airplane), or the like.

[0082] In the embodiments of the present application, the wireless access device 10 and the terminal device 20 can be referred to as a wireless communication device. The structure of the wireless communication device is described below by taking a mobile phone as an example.

[0083] Figure 3 A structure diagram of a wireless communication device is provided in the embodiments of the present application. The wireless communication device can include radio frequency (RF) circuit 110, memory 120, input unit 130, display unit 140, sensor 150, audio circuit 160, processor 170, and power supply 180, and the like.

[0084] The RF circuit 110 can be used to transmit and receive information, or receive or send signals during a call. In particular, after receiving the downlink information of the base station, the processor 170 is processed; in addition, the uplink data is sent to the base station. Generally, the RF circuit 110 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier (LNA), a duplexer, and the like. In addition, the RF circuit 110 can also communicate with the network and other devices through wireless communication.

[0085] The memory 120 can be used to store data, software programs and modules, including a program storage area and a data storage area, wherein the program storage area can store an operating system, at least one application program required by a function, such as a sound playing function, an image playing function, and the like; the data storage area can store data created according to the use of the wireless communication device, such as audio data, image data, a phone book, and the like. In addition, the wireless communication device can include a high-speed random access memory, and can also include a non-volatile memory, for example, at least one magnetic disk storage device, a flash memory device, or other volatile solid-state storage device.

[0086] The input unit 130 can be used to receive input digital or character information, and generate key signal input related to the user settings and function control of the wireless communication device. The input unit 130 can include a touch screen 131 and other input devices 132. The touch screen 131 can collect the touch operation of the user on or near it, and drive the corresponding connection device according to the pre-set program. For example, the touch operation can include the operation of the user using a finger, a stylus, or any suitable object or accessory on or near the touch screen. Optionally, the other input devices 132 can include one or more of a physical keyboard, a function key, a mouse, a joystick, and the like, such as the function key including a volume control button, a power on-off button, and the like.

[0087] The display unit 140 can be used to display information input by a user or provided to the user, as well as various menus of the wireless communication device, etc. In one example, the display unit 140 can include a display screen 141, which can be configured in the form of a liquid crystal display (LCD), an organic light-emitting diode (OLED), etc. Further, the touch screen 131 can cover the display screen 141, and when the touch screen 131 detects a touch operation thereon or adjacent thereto, transmit to the processor 170 to determine the type of touch event, and then the processor 170 provides corresponding visual output on the display screen 141 according to the type of touch event. Although in the figure, the touch screen 131 and the display screen 141 are implemented as two independent components to realize the input and output functions of the wireless communication device, in some embodiments, the touch screen 131 and the display screen 141 can be integrated to realize the input and output functions of the wireless communication device.

[0088] The sensor 150 can include one or more sensors for providing various aspects of state evaluation for the wireless communication device. Among them, the sensor 150 can include a light sensor, which can be used in imaging applications, i.e., as a component of a camera or camera. In addition, the sensor 150 can also include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor, through which the acceleration / deceleration of the wireless communication device, the orientation, the open / close state, the relative positioning of components, or the temperature change of the wireless communication device, etc. can be detected.

[0089] The audio circuit 160, the speaker, and the microphone can provide an audio interface between the user and the wireless communication device. The audio circuit 160 can convert the received audio data into an electrical signal and transmit it to the speaker, which converts it into a sound signal output; on the other hand, the microphone collects sound signals and converts them into electrical signals, which are received by the audio circuit 160 and converted into audio data, which are then output to the RF circuit 110 for transmission to, for example, another mobile phone, or to the memory 120 for further processing.

[0090] The processor 170 is the control center of the wireless communication device, connects all parts of the wireless communication device through various interfaces and lines, performs various functions of the wireless communication device and processes data by running or executing software programs and / or modules stored in the memory 120 and calling data stored in the memory 120, thereby overall controlling the wireless communication device. Optionally, the processor 170 can include one or more processing units, which can include but are not limited to: a central processing unit (CPU), a network processing unit (NPU), a graphic processing unit (GPU), an image signal processor (ISP), a tensor processing unit (TPU), a data processing unit (DPU), a digital signal processor (DSP), a microcontroller or a microprocessor, etc. Further, the processor 170 can also include other hardware circuits or accelerators, such as an application specific integrated circuit (ASIC), a complex programmable logic device (CPLD) or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. Optionally, the processor 170 can also be a combination of computing functions, such as a combination of one or more microprocessors, a combination of a digital signal processor and a microprocessor, etc.

[0091] The wireless communication device can also include a power supply 180 (such as a battery) to power various components. The power supply 180 can be logically connected to the processor 170 through a power management system, so that the power management system can realize functions such as management of charging, discharging, and power consumption management. Optionally, the power management system can support both fast charging technology and non-fast charging technology, and in actual application, the power management system can charge the battery in the power supply 180 through fast charging technology, or charge the battery in the power supply 180 through non-fast charging technology.

[0092] Optionally, the wireless communication device can also include a Wi-Fi module, a Bluetooth module, etc., which will not be described here in detail. Those skilled in the art can understand that, Figure 3The wireless communication device structure shown in the figures is not intended to limit the wireless communication device, which can include more or fewer components than shown, or combine some components, or have different arrangements of the components.

[0093] Figure 4 A flowchart of a reference signal transmission method is provided for the embodiments of the present application. The method includes the following steps. The method can be applied in a wireless communication system including a sending device and a receiving device, the sending device can be a device sending a reference signal, and the receiving device can be a device receiving the reference signal. In an example, the sending device can be one of the wireless access devices or terminal devices in the wireless communication system provided above, and the receiving device can be the other one of the wireless access devices or terminal devices.

[0094] S201: The sending device maps a channel measurement reference signal to be sent on one time domain symbol of one radio frame in time domain on X subcarriers of a corresponding carrier in frequency domain, wherein the carrier is composed of 157 continuous subcarriers, and X is less than or equal to 157.

[0095] The radio frame can be any one of the radio frames included in one super frame, or a specific radio frame; the time domain symbol can be any one of the time domain symbols included in the radio frame, or a specific time domain symbol. For example, the super frame includes 8 radio frames with corresponding indexes 0 to 7 in sequence, the radio frame has an index n, and the value of n can be one of 0 to 7; the radio frame can include N time domain symbols with corresponding indexes 0 to N-1 in sequence, and the index of the time domain symbol can be one of 0 to N-1.

[0096] In addition, the channel measurement reference signal can be a reference signal for channel measurement. Optionally, the channel measurement reference signal can be a channel state information reference signal CSI-RS, or a sounding reference signal SRS. In an example, when the sending device is a G node, the channel measurement reference signal is a channel state information reference signal CSI-RS. In another example, when the sending device is a T node, the channel measurement reference signal can be a sounding reference signal SRS.

[0097] Further, the carrier in step S201 corresponds to the carrier corresponding to the target antenna port introduced later in combination with step S202a, i.e. the carrier transmitted through the target antenna port. In an example, as shown in (b) of FIG. 2, the channel bandwidth of the carrier is 20 MHz, the carrier is composed of 157 continuous subcarriers, and the width of each subcarrier in the 157 subcarriers is 120 kHz, and the corresponding subcarrier spacing is also 120 kHz. Figure 1 In an example, as shown in (b) of FIG. 2, the channel bandwidth of the carrier is 20 MHz, the carrier is composed of 157 continuous subcarriers, and the width of each subcarrier in the 157 subcarriers is 120 kHz, and the corresponding subcarrier spacing is also 120 kHz.

[0098] Optionally, the 157 subcarriers of the carrier can be sequentially indexed as 0 to 156 in order of frequency from low to high, wherein the subcarrier with index 78 is the DC subcarrier, and the other subcarriers are all valid subcarriers, i.e., the subcarriers with indexes 0 to 77 and 79 to 156 are all valid subcarriers.

[0099] In the embodiments of the present application, the channel measurement reference signal is mapped onto X subcarriers of the carrier, X is less than or equal to 157, and specifically can include: mapping the channel measurement reference signal onto the 157 subcarriers, or mapping the channel measurement reference signal onto part of the 157 subcarriers. Wherein the ratio of the number of the part of subcarriers to the number of valid subcarriers in the 157 subcarriers can be 1 / Q, Q is an integer greater than 0, for example, the value of Q can be 1, 2, or 3, etc. Optionally, the value mapped on the DC subcarrier can be 0, and hereinafter the value mapped on the DC subcarrier is taken as 0 for example.

[0100] The following will be introduced Figures 5 to 10 several possible cases of mapping the channel measurement reference signal onto X subcarriers of the carrier.

[0101] In a first possible embodiment, as Figure 5 shown, mapping the channel measurement reference signal onto X subcarriers of the carrier can include: mapping the channel measurement reference signal onto each valid subcarrier of the 157 subcarriers of the carrier. That is, mapping the channel measurement reference signal onto the subcarriers with indexes 0 to 77 and 79 to 156. Figure 5 The 157 REs corresponding to the 157 subcarriers and the time domain symbol l are shown in

[0102] Optionally, the complex value of the channel measurement reference signal mapped on each valid subcarrier of the 157 subcarriers satisfies the following formula (2-1):

[0103]

[0104] Wherein n represents the index of the radio frame, l represents the index of the time domain symbol, k represents the index of the corresponding subcarrier, r n,l (k) represents the kth value in the pseudo-random sequence of the channel measurement reference signal, i represents the index of the target antenna port, represents a complex value of the channel measurement reference signal mapped on the kth subcarrier. For example, the pseudo-random sequence can be a pseudo-random quadrature phase shift keying (QPSK) sequence.

[0105] In this embodiment, the channel measurement reference signal of the target antenna port occupies all 157 subcarriers of one time-domain symbol of one radio frame, and the complex value mapped on the DC subcarrier with index 78 is always 0. Correspondingly, the time-frequency resource overhead of the channel measurement reference signal is: all subcarriers of one time-domain symbol.

[0106] In a second possible embodiment, as shown in Figure 6 mapping the channel measurement reference signal on the 157 subcarriers of the carrier can include: mapping the channel measurement reference signal on 52 valid subcarriers in the 157 subcarriers of the carrier; wherein the 52 valid subcarriers are subcarriers with indexes k being 0, 3, 6, 9, …, 75, 79, 82, 85, …, 154 in the 157 subcarriers, and the index k is specifically shown in formula (2-2). Figure 6 The 157 REs corresponding to the 157 subcarriers and the time-domain symbol l are shown in formula (2-1), and the 157 REs include a DC subcarrier RE, a reference signal RE, and other REs, the DC subcarrier RE represents the RE of the DC subcarrier with index 78, the reference signal RE represents the RE on which the measurement reference signal is mapped, and the other RE represents the RE on which no measurement reference signal is mapped.

[0107] Optionally, the complex value of the channel measurement reference signal mapped on the 52 valid subcarriers in the 157 subcarriers satisfies the following formula (2-2):

[0108]

[0109] wherein n represents the index of the radio frame, l represents the index of the time-domain symbol, k represents the index of the corresponding subcarrier, r n,l (k) represents the kth value in the pseudo-random sequence of the channel measurement reference signal, i represents the index of the target antenna port, a RS represents the power factor of the channel measurement reference signal, represents a complex value of the channel measurement reference signal mapped on the kth subcarrier. For example, the pseudo-random sequence can be a pseudo-random quadrature phase shift keying (QPSK) sequence.

[0110] In this embodiment, the channel measurement reference signal at the target antenna port occupies 52 effective subcarriers in one time-domain symbol of a radio frame. Specifically, these include subcarriers with indices 0, 3, 6, 9, ..., 75, 79, 82, 85, ..., 154, and the complex value mapped to each subcarrier is the product of a pseudo-random sequence value and a power factor. Among these 52 effective subcarriers, only the index difference between adjacent subcarriers 75 and 79 is 4; the index difference between other adjacent subcarriers is 3, and the complex value mapped to the DC subcarrier with index 78 is always 0. Accordingly, the time-frequency resource overhead of this channel measurement reference signal is one-third of the effective subcarriers within one time-domain symbol.

[0111] In a third possible embodiment, such as Figure 7 As shown, mapping the channel measurement reference signal to X subcarriers of the carrier can include: mapping the channel measurement reference signal to 52 effective subcarriers out of the 157 subcarriers of the carrier; wherein, the 52 effective subcarriers are the subcarriers with indices k of 1, 4, 7, ..., 76, 80, 83, 86, ..., 155 among the 157 subcarriers, and the specific index k is shown in formula (2-3). Figure 7 The diagram illustrates the 157 subcarriers and time-domain symbols, corresponding to 157 REs. These 157 REs include DC subcarrier REs, reference signal REs, and other REs. The DC subcarrier RE represents the RE of the DC subcarrier with index 78, the reference signal RE represents the RE of the mapped measurement reference signal, and the other REs represent the REs of the unmapped measurement reference signal.

[0112] Optionally, the complex values ​​of the channel measurement reference signal mapped onto 52 effective subcarriers out of the 157 subcarriers satisfy the following formula (2-3):

[0113]

[0114] Where n represents the index of the radio frame, l represents the index of the time-domain symbol, k represents the index of the corresponding subcarrier, and r n l(k) represents the k-th value in the pseudo-random sequence of the channel measurement reference signal, i represents the index of the target antenna port, and α RS This represents the power factor of the reference signal measured in this channel. This represents the complex value of the channel measurement reference signal mapped onto the k-th subcarrier.

[0115] In this embodiment, the channel measurement reference signal at the target antenna port occupies 52 effective subcarriers in one time-domain symbol of a radio frame. Specifically, these include subcarriers with indices 1, 4, 7, ..., 76, 80, 83, 86, ..., 155, and the complex value mapped to each subcarrier is the product of a pseudo-random sequence value and a power factor. Among these 52 effective subcarriers, only the index difference between adjacent subcarriers 76 and 80 is 4; the index difference between other adjacent subcarriers is 3, and the complex value mapped to the DC subcarrier with index 78 is always 0. Accordingly, the time-frequency resource overhead of this channel measurement reference signal is one-third of the effective subcarriers within one time-domain symbol.

[0116] In a fourth possible embodiment, such as Figure 8 As shown, mapping the channel measurement reference signal to X subcarriers of the carrier can include: mapping the channel measurement reference signal to 52 effective subcarriers out of the 157 subcarriers of the carrier; wherein, the 52 effective subcarriers are the subcarriers with indices k of 2, 5, 8, ..., 77, 81, 84, 87, ..., 156 among the 157 subcarriers, and the specific index k is shown in formula (2-4). Figure 8 The diagram illustrates the 157 subcarriers and time-domain symbols, corresponding to 157 REs. These 157 REs include DC subcarrier REs, reference signal REs, and other REs. The DC subcarrier RE represents the RE of the DC subcarrier with index 78, the reference signal RE represents the RE of the mapped measurement reference signal, and the other REs represent the REs of the unmapped measurement reference signal.

[0117] Optionally, the complex values ​​of the channel measurement reference signal mapped onto 52 effective subcarriers out of the 157 subcarriers satisfy the following formula (2-4):

[0118]

[0119] Where n represents the index of the radio frame, l represents the index of the time-domain symbol, k represents the index of the corresponding subcarrier, and r n l(k) represents the k-th value in the pseudo-random sequence of the channel measurement reference signal, i represents the index of the target antenna port, and α RS This represents the power factor of the reference signal measured in this channel. This represents the complex value of the channel measurement reference signal mapped onto the k-th subcarrier.

[0120] In this embodiment, the channel measurement reference signal at the target antenna port occupies 52 effective subcarriers in one time-domain symbol of a radio frame. Specifically, these include subcarriers with indices 2, 5, 8, ..., 77, 81, 84, 87, ..., 156, and the complex value mapped to each subcarrier is the product of a pseudo-random sequence value and a power factor. Among these 52 effective subcarriers, only the index difference between adjacent subcarriers 77 and 81 is 4; the index difference between other adjacent subcarriers is 3, and the complex value mapped to the DC subcarrier with index 78 is always 0. Accordingly, the time-frequency resource overhead of this channel measurement reference signal is one-third of the effective subcarriers within one time-domain symbol.

[0121] In the fifth possible embodiment, such as Figure 9 As shown, mapping the channel measurement reference signal to X subcarriers of the carrier can include: mapping the channel measurement reference signal to 78 effective subcarriers out of the 157 subcarriers of the carrier; wherein, the 78 effective subcarriers are the subcarriers with indices k of 0, 2, 4, ..., 76, 79, 81, 83, ..., 155 among the 157 subcarriers, and the specific index k is shown in formula (2-5). Figure 9 The diagram illustrates the 157 subcarriers and time-domain symbols, corresponding to 157 REs. These 157 REs include DC subcarrier REs, reference signal REs, and other REs. The DC subcarrier RE represents the RE of the DC subcarrier with index 78, the reference signal RE represents the RE of the mapped measurement reference signal, and the other REs represent the REs of the unmapped measurement reference signal.

[0122] Optionally, the complex values ​​of the channel measurement reference signal mapped onto 78 effective subcarriers out of the 157 subcarriers satisfy the following formula (2-5):

[0123]

[0124] Where n represents the index of the radio frame, l represents the index of the time-domain symbol, k represents the index of the corresponding subcarrier, and r n l(k) represents the k-th value in the pseudo-random sequence of the channel measurement reference signal, i represents the index of the target antenna port, and α RS This represents the power factor of the reference signal measured in this channel. This represents the complex value of the channel measurement reference signal mapped onto the k-th subcarrier.

[0125] In this embodiment, the channel measurement reference signal at the target antenna port occupies 78 effective subcarriers within one time-domain symbol of a radio frame. Specifically, these include subcarriers with indices 0, 2, 4, ..., 76, 79, 81, 83, ..., 155, and the complex value mapped to each subcarrier is the product of a pseudo-random sequence value and a power factor. Among these 78 effective subcarriers, only the index difference between adjacent subcarriers 76 and 79 is 3; the index difference between other adjacent subcarriers is 2, and the complex value mapped to the DC subcarrier with index 78 is always 0. Accordingly, the time-frequency resource overhead of this channel measurement reference signal is half of the effective subcarriers within one time-domain symbol.

[0126] In the sixth possible embodiment, such as Figure 10 As shown, mapping the channel measurement reference signal onto X subcarriers of the carrier can include: mapping the channel measurement reference signal onto 78 effective subcarriers out of the 157 subcarriers of the carrier; wherein, the 78 effective subcarriers are the subcarriers with indices k of 1, 3, 5, ..., 77, 80, 82, 84, ..., 156 among the 157 subcarriers, and the specific index k is shown in formula (2-6). Figure 10 The diagram illustrates the 157 subcarriers and time-domain symbols, corresponding to 157 REs. These 157 REs include DC subcarrier REs, reference signal REs, and other REs. The DC subcarrier RE represents the RE of the DC subcarrier with index 78, the reference signal RE represents the RE of the mapped measurement reference signal, and the other REs represent the REs of the unmapped measurement reference signal.

[0127] Optionally, the complex values ​​of the channel measurement reference signal mapped onto 78 effective subcarriers out of the 157 subcarriers satisfy the following formula (2-6):

[0128]

[0129] Where n represents the index of the radio frame, l represents the index of the time-domain symbol, k represents the index of the corresponding subcarrier, and r n l(k) represents the k-th value in the pseudo-random sequence of the channel measurement reference signal, i represents the index of the target antenna port, and α RS This represents the power factor of the reference signal measured in this channel. This represents the complex value of the channel measurement reference signal mapped onto the k-th subcarrier.

[0130] In this embodiment, the channel measurement reference signal of the target antenna port occupies 52 valid subcarriers of one time domain symbol of one radio frame, specifically including subcarriers with indexes of 1, 3, 5, …, 77, 80, 82, 84, …, 156, and the complex values mapped on each subcarrier are the product of the value of a pseudo-random sequence and a power factor. In the 52 valid subcarriers, only the index difference between adjacent subcarriers 77 and 81 is 3, the index difference between other adjacent subcarriers is 2, and the complex value mapped on the DC subcarrier with index 78 is always 0. Correspondingly, the time-frequency resource overhead of the channel measurement reference signal is: one-half of the valid subcarriers in one time domain symbol.

[0131] Optionally, in the second possible embodiment to the sixth possible embodiment, the value of α RS may be equal to 1, or For example, in the second possible embodiment to the fourth possible embodiment, the value of α RS is equal to 1 or In the fifth possible embodiment to the sixth possible embodiment, the value of α RS is equal to 1 or In actual applications, the value of α RS may also be equal to other real numbers, and the embodiments of the present application do not make specific limitations in this regard.

[0132] S202a: The sending device sends the channel measurement reference signal on the X subcarriers through the target antenna port.

[0133] Optionally, the sending device includes a plurality of antenna ports, and the target antenna port is any one of the plurality of antenna ports or a certain specific antenna port. For example, the sending device includes P antenna ports corresponding to indexes 0 to P-1 in turn, the index of the target antenna port is i, and the value of i can be one of 0 to P-1.

[0134] In one possible embodiment, after the sending device maps the channel measurement reference signal on the X subcarriers of the carrier, the sending device can send the channel measurement reference signal on the X subcarriers corresponding to the time domain symbol of the radio frame through the target antenna port. Optionally, when there are some valid subcarriers in the 157 subcarriers corresponding to the time domain symbol that are not mapped with measurement reference signals, the sending device can also send data or other information on the valid subcarriers, or send data or other information on the carrier corresponding to other time domain symbols of the radio frame, and the embodiments of the present application do not make specific limitations in this regard.

[0135] S202b: The receiving device receives the channel measurement reference signal on the X subcarriers through the target antenna port.

[0136] In a possible embodiment, when the sending device sends the channel measurement reference signal on the X subcarriers, the receiving device can receive the channel measurement reference signal on the X subcarriers through its target antenna port. Wherein, the related description about the channel measurement reference signal and the X subcarriers can refer to the description in the foregoing, and the embodiments of the present application will not be described here again.

[0137] Optionally, when the receiving device receives the channel measurement reference signal on the X subcarriers, the receiving device can demodulate the channel measurement reference signal, and measure the channel state information CSI according to the measurement reference signal, so as to adjust and optimize the communication process between the sending device and the receiving device according to the channel measurement result, or feed back the information in the channel measurement result to the sending device.

[0138] In the embodiments of the present application, for the channel measurement reference signal to be sent on one time domain symbol of one radio frame in time domain, the channel measurement reference signal is mapped to the X subcarriers of the corresponding carrier in frequency domain, the carrier is composed of 157 continuous subcarriers, and X is less than or equal to 157, and then the channel measurement reference signal is sent on the X subcarriers through the target antenna port, so that the channel measurement reference signal can be mapped to and sent on the carrier composed of a larger number of subcarriers, and the more the number of subcarriers included in the carrier, the smaller the subcarrier width and subcarrier spacing, and the smaller the influence of frequency selective fading, so that the scheme can improve the system performance while ensuring the reliability and efficiency of information transmission. In addition, the embodiments of the present application also support mapping the channel measurement reference signal to a part of the 157 subcarriers, for example, 52 effective subcarriers, so that the time-frequency resource overhead of the channel measurement reference signal can be reduced while ensuring the channel measurement performance, that is, the channel measurement performance and the time-frequency resource overhead are considered.

[0139] In some embodiments, the specific mapping manner of the channel measurement reference signal on the 157 subcarriers of the carrier can be specified in advance according to the needs, so that it is fixed and unchanged in use, so that the overhead of indicating the specific mapping manner can be saved.

[0140] However, in some other embodiments, the mapping manner of the channel measurement reference signal on the 157 subcarriers of the carrier can also be indicated by high layer signaling or physical layer control information, so that the flexible switching of different mapping manners can be realized by high layer signaling or physical layer control information to adapt to different actual use requirements. Specifically, when the wireless access device is a sending device or a receiving device, the high layer signaling or physical layer control information can be sent by the wireless access device to the terminal device to indicate the mapping manner of the channel measurement reference signal to the terminal device, so that the channel measurement reference signal can be demodulated according to the indication when the terminal device is a receiving device, and the channel measurement reference signal can be mapped according to the indication when the terminal device is a sending device. For example, when the sending device is a terminal device and the receiving device is a wireless access device, the wireless access device sends the high layer signaling or physical layer control information to the terminal device to indicate the mapping manner of the channel measurement reference signal to the terminal device, so that the terminal device demodulates the channel measurement reference signal according to the indication. Figure 4 As shown in FIG. 2, before S201, the method further includes S203. Figure 11 As shown in FIG. 2, before S201, the method further includes S203.

[0141] S203: The sending device receives high layer signaling or physical layer control information from the receiving device, and the high layer signaling or physical layer control information includes target configuration information, which is used to indicate the mapping manner of the channel measurement reference signal in the frequency domain.

[0142] For example, the target configuration information is used to indicate the mapping manner of the channel measurement reference signal in the frequency domain, and specifically can be described as: the target configuration information is used to indicate the mapping manner of the channel measurement reference signal in the frequency domain to be sent on one time domain symbol of one radio frame in the time domain.

[0143] In the embodiments of the present application, the mapping manner indicated by the target configuration information can be one of a plurality of candidate mapping manners, and the plurality of candidate mapping manners can be pre-configured. Optionally, the plurality of candidate mapping manners can include the mapping manners provided in at least two of the first to sixth possible embodiments described above. Among them, the mapping manner provided in the first possible embodiment above can be referred to as the first mapping manner, the mapping manner provided in the second possible embodiment can be referred to as the second mapping manner, the mapping manner provided in the third possible embodiment can be referred to as the third mapping manner, the mapping manner provided in the fourth possible embodiment can be referred to as the fourth mapping manner, the mapping manner provided in the fifth possible embodiment can be referred to as the fifth mapping manner, and the mapping manner provided in the sixth possible embodiment can be referred to as the sixth mapping manner.

[0144] That is, the plurality of candidate mapping manners include at least two of the first mapping manner, the second mapping manner, the third mapping manner, the fourth mapping manner, the fifth mapping manner, and the sixth mapping manner. The first mapping manner indicates that the channel measurement reference signal is mapped to each of the 157 valid subcarriers of the carrier. The second mapping manner indicates that the channel measurement reference signal is mapped to 52 valid subcarriers of the 157 subcarriers of the carrier, and the 52 valid subcarriers are subcarriers with indexes k of 0, 3, 6, 9, …, 75, 79, 82, 85, …, 154 of the 157 subcarriers, and the index k is specifically shown in formula (2-2). The third mapping manner indicates that the channel measurement reference signal is mapped to 52 valid subcarriers of the 157 subcarriers of the carrier, and the 52 valid subcarriers are subcarriers with indexes k of 1, 4, 7, …, 76, 80, 83, 86, …, 155 of the 157 subcarriers, and the index k is specifically shown in formula (2-3). The fourth mapping manner indicates that the channel measurement reference signal is mapped to 52 valid subcarriers of the 157 subcarriers of the carrier, and the 52 valid subcarriers are subcarriers with indexes k of 2, 5, 8, …, 77, 81, 84, 87, …, 156 of the 157 subcarriers, and the index k is specifically shown in formula (2-4). The fifth mapping manner indicates that the channel measurement reference signal is mapped to 78 valid subcarriers of the 157 subcarriers of the carrier, and the 78 valid subcarriers are subcarriers with indexes k of 0, 2, 4, …, 76, 79, 81, 83, …, 155 of the 157 subcarriers, and the index k is specifically shown in formula (2-5). The sixth mapping manner indicates that the channel measurement reference signal is mapped to 78 valid subcarriers of the 157 subcarriers of the carrier, and the 78 valid subcarriers are subcarriers with indexes k of 1, 3, 5, …, 77, 80, 82, 84, …, 156 of the 157 subcarriers, and the index k is specifically shown in formula (2-6).

[0145] For detailed descriptions of the above first mapping manner to the sixth mapping manner, refer to the related descriptions in the first possible embodiment to the sixth possible embodiment in the foregoing, and the embodiments of the present application will not be described herein.

[0146] In a possible example, the target configuration information occupies 1 bit, and the number of the plurality of candidate mapping manners is two, and the two candidate mapping manners can be any two of the first mapping manner to the sixth mapping manner. Optionally, different mapping manners can be indicated by different values of the 1 bit. For example, the plurality of candidate mapping manners include the first mapping manner and the second mapping manner, and when the value of the 1 bit is 0, the first mapping manner is indicated, and when the value of the 1 bit is 1, the second mapping manner is indicated.

[0147] In another possible example, the target configuration information occupies 2 bits, and the number of the plurality of candidate mapping manners is three or four, and the three candidate mapping manners can be any three of the first mapping manner to the sixth mapping manner. Optionally, different mapping manners can be indicated by different values of the 2 bits. For example, the plurality of candidate mapping manners include the first mapping manner, the second mapping manner, and the third mapping manner, and when the value of the 2 bits is 00, the first mapping manner is indicated, when the value of the 2 bits is 01, the second mapping manner is indicated, and when the value of the 2 bits is 10, the third mapping manner is indicated.

[0148] In another possible example, the target configuration information occupies 2 bits, and the number of the plurality of candidate mapping manners is three or four, and the three candidate mapping manners can be any three of the first mapping manner to the sixth mapping manner. Optionally, different mapping manners can be indicated by different values of the 2 bits. For example, the plurality of candidate mapping manners include the first mapping manner, the second mapping manner, and the third mapping manner, and when the value of the 2 bits is 00, the first mapping manner is indicated, when the value of the 2 bits is 01, the second mapping manner is indicated, and when the value of the 2 bits is 10, the third mapping manner is indicated.

[0149] It can be understood that the above description about the number of bits occupied by the target configuration information and the mapping manners indicated by different values of the bits of different numbers is only exemplary, and in actual application, the target configuration information can also occupy more bits, and other different mapping manners can be indicated by different values of the bits, and the embodiments of the present application do not make specific limitation in this regard.

[0150] Correspondingly, when the sending device receives the high-layer signaling or the physical layer control information, the sending device can map the channel measurement reference signal to the X subcarriers of the corresponding carrier according to the mapping manner indicated by the target configuration information in the high-layer signaling or the physical layer control information.

[0151] In the embodiments of the present application, the mapping manner of the channel measurement reference signal in the frequency domain can be indicated by the target configuration information in the high layer signaling or the physical layer control information. The mapping manner indicated by the target configuration information can be one of multiple candidate mapping manners. In actual application, the multiple candidate mapping manners and the mapping manner indicated by the target configuration information can be flexibly configured according to actual requirements, so as to realize flexible switching of different mapping manners. For example, only as an example, when the first mapping manner of the first mapping manner to the sixth mapping manner is required to be used to map the channel measurement reference signal in a first time period, and the second mapping manner different from the first mapping manner of the first mapping manner to the sixth mapping manner is required to be switched to map the channel measurement reference signal in a second time period, the receiving device can first send the high layer signaling or the physical layer control information indicating the first mapping manner to the sending device in the first time period, so that the sending device maps the channel measurement reference signal on the multiple subcarriers corresponding to the first mapping manner according to the first mapping manner in the first time period. Then, the receiving device can send the high layer signaling or the physical layer control information indicating the second mapping manner to the sending device in the second time period, so that the sending device maps the channel measurement reference signal on the multiple subcarriers corresponding to the second mapping manner according to the second mapping manner in the second time period.

[0152] The above describes the scheme provided by the embodiments of the present application mainly from the perspective of the interaction between the sending device and the receiving device. It can be understood that the sending device and the receiving device contain the corresponding hardware structure and / or software module for executing each function in order to realize the above functions. Those skilled in the art should easily realize that the units and algorithm steps of each example described in combination with the embodiments disclosed in the present application can be realized in the form of hardware or the combination of hardware and computer software. Whether a certain function is executed by hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. The skilled person can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0153] The embodiments of the present application can divide the function modules of the sending device and the receiving device according to the above method examples. For example, each function module can be divided according to each function, or two or more functions can be integrated in one module. The integrated module can be realized in the form of hardware or software function module. It should be noted that the division of the modules in the embodiments of the present application is illustrative, and is only a logical function division. In actual implementation, there can be another division manner. The following takes the division of each function module according to each function as an example for description.

[0154] In the case of employing an integrated unit, Figure 12 A structural diagram of a reference signal transmission apparatus involved in the above embodiment is shown. The apparatus can be a wireless access device, a terminal device, or a chip applied to the above devices, and the apparatus includes a processing unit 301, a sending unit 302, and a receiving unit 303. In a possible embodiment, the processing unit 301 can be configured to support the apparatus to perform S201 in the above method embodiment; the sending unit 302 can be configured to support the apparatus to perform S202a in the above method embodiment; further, the receiving unit 303 can be configured to support the apparatus to perform S203 in the above method embodiment. In another possible embodiment, the receiving unit 303 can be configured to support the apparatus to perform S202b in the above method embodiment, and the processing unit 301 can be configured to support the apparatus to demodulate the channel measurement reference signal; further, the sending unit 302 can be configured to support the apparatus to send the high-layer signaling or the physical layer control information. All the related contents of the steps involved in the above method embodiment can be referred to the function description of the corresponding function modules, and the embodiments of the present application will not be repeated here.

[0155] On the basis of hardware implementation, the processing unit 301 in the embodiments of the present application can be a processor of the apparatus, the sending unit 302 can be a transmitter of the apparatus, and the receiving unit 303 can be a receiver of the apparatus. The transmitter and the receiver can be integrated together to serve as a transceiver, and the specific transceiver can also be referred to as a communication interface or an interface circuit.

[0156] As shown in Figure 13 A structural diagram of another reference signal transmission apparatus involved in the above embodiment provided by the embodiments of the present application is shown. The apparatus can be a wireless access device, a terminal device, or a chip applied to the above devices, and the apparatus includes a processor 312, and can further include a memory 311, a communication interface 313, and a bus 314. The processor 312, the memory 311, and the communication interface 313 are connected through the bus 314.

[0157] The processor 312 is configured to control and manage the actions of the apparatus. In a possible embodiment, the processor 312 can be configured to support the apparatus to perform S201 in the above method embodiment, and / or other technical processes described herein. In another possible embodiment, the processor 312 can be configured to support the apparatus to perform the step of demodulating the channel measurement reference signal in the above method embodiment, and / or other technical processes described herein. The communication interface 313 is configured to support the apparatus to communicate, such as supporting the apparatus to communicate with other devices.

[0158] In the embodiments of the present application, the processor 312 can be a central processing unit, a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a transistor logic device, a hardware component or any combination thereof. It can implement or execute various exemplary logical blocks, modules and circuits described in combination with the disclosure of the present application. The processor can also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a digital signal processor and a microprocessor, and the like. The above bus 314 can include an address bus, a data bus, a control bus and the like.

[0159] In another embodiment of the present application, a wireless communication system is provided, which includes a wireless access device and a terminal device; wherein the wireless access device or the terminal device can be or include the above-mentioned reference signal transmission apparatus, for performing the steps of the transmitting device in the above-provided method embodiments, or for performing the steps of the receiving device in the above-provided method embodiments.

[0160] It can be understood that all related contents of the steps involved in the above method embodiments can be cited into the embodiments of the reference signal transmission apparatus and the wireless communication system, which will not be described herein again.

[0161] In several embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented by other manners. For example, the above-described apparatus embodiments are only illustrative, for example, the division of the modules or units is only a logical function division, and actual implementation can have another division manner, for example, multiple units or components can be combined or integrated into another apparatus, or some features can be ignored or not executed.

[0162] The units described as separate components can or can not be physically separate, and the components shown as units can be one physical unit or multiple physical units, that is, can be located in one place or can be distributed to multiple different places. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiments.

[0163] The integrated units, if implemented in the form of software function units and sold or used as independent products, can be stored in a readable storage medium, which can include a U disk, a mobile hard disk, a read-only memory, a random access memory, a magnetic disk or an optical disk and various storage program codes. Based on such understanding, the technical solutions of the embodiments of the present application can be embodied in the form of software products, or the essential part or all or part of the technical solutions of the present application can be embodied in the form of software products.

[0164] In another embodiment of the present application, a computer readable storage medium is also provided, which stores instructions, when a device (which can be a single-chip microcomputer, a chip, etc.) or a processor executes the instructions, causes the device or the processor to perform the steps of the sending device in the method embodiments.

[0165] In another embodiment of the present application, a computer readable storage medium is also provided, which stores instructions, when a device (which can be a single-chip microcomputer, a chip, etc.) or a processor executes the instructions, causes the device or the processor to perform the steps of the receiving device in the method embodiments.

[0166] In yet another embodiment of the present application, a computer program product is also provided, which includes a computer program (which can also be referred to as code or instructions), when the computer program is run by a processor of a device, causes the device to perform the steps of the sending device in the method embodiments.

[0167] In yet another embodiment of the present application, a computer program product is also provided, which includes a computer program (which can also be referred to as code or instructions), when the computer program is run by a processor of a device, causes the device to perform the steps of the receiving device in the method embodiments.

[0168] Finally, it should be noted that: the above is merely a specific implementation of the present application, but the protection scope of the present application is not limited to this, any change or replacement within the technical scope disclosed in the present application should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A reference signal transmission method, characterized by, The method comprises: For a channel measurement reference signal to be sent on one time domain symbol of one radio frame in time domain, in frequency domain, the channel measurement reference signal is mapped onto X subcarriers of a corresponding carrier, wherein the carrier is composed of 157 consecutive subcarriers, and the X is less than or equal to 157; The channel measurement reference signal is sent on the X subcarriers through a target antenna port.

2. The method of claim 1, wherein, The channel measurement reference signal comprises a channel state information reference signal (CSI-RS) or a sounding reference signal (SRS).

3. The method according to claim 1 or 2, characterized in that, The 157 subcarriers of the carrier are sequentially numbered and indexed from 0 to 156 in order of frequency from low to high, wherein the subcarrier with index 78 is a direct current subcarrier, and the other subcarriers are all valid subcarriers.

4. The method of claim 3, wherein, Mapping the channel measurement reference signal onto the X subcarriers of the corresponding carrier comprises: mapping the channel measurement reference signal onto each valid subcarrier of the 157 subcarriers of the carrier.

5. The method of claim 4, wherein, The complex value of the channel measurement reference signal mapped on each valid subcarrier of the 52 valid subcarriers satisfies: wherein n denotes an index of the radio frame, 1 denotes an index of the time domain symbol, k denotes an index of a respective subcarrier, r n，l (k) denotes the k-th value in a pseudo-random sequence of the channel measurement reference signal, i denotes an index of the target antenna port, denotes a complex value of the channel measurement reference signal mapped on the k-th subcarrier.

6. The method of claim 3, wherein, mapping the channel measurement reference signal onto X subcarriers of the respective carrier comprises mapping the channel measurement reference signal onto 52 valid subcarriers of the 157 subcarriers of the carrier, the 52 valid subcarriers being subcarriers of the 157 subcarriers with indices .

7. The method of claim 6, wherein, The complex value of the channel measurement reference signal mapped on each valid subcarrier of the 52 valid subcarriers satisfies: wherein n denotes an index of the wireless frame, I denotes an index of the time domain symbol, k denotes an index of a corresponding subcarrier, r n,l (k) denotes a k-th value in a pseudo-random sequence of the channel measurement reference signal, i denotes an index of the target antenna port, a RS denotes a power factor of the channel measurement reference signal, denotes a complex value of the channel measurement reference signal mapped on a k-th subcarrier.

8. The method of claim 3, wherein, mapping the channel measurement reference signal onto X subcarriers of the respective carrier comprises mapping the channel measurement reference signal onto 52 valid subcarriers of the 157 subcarriers of the carrier, the 52 valid subcarriers being subcarriers of the 157 subcarriers with indices .

9. The method of claim 8, wherein, The complex value of the channel measurement reference signal mapped on each valid subcarrier of the 52 valid subcarriers satisfies: wherein n denotes an index of the wireless frame, I denotes an index of the time domain symbol, k denotes an index of a corresponding subcarrier, r n,l (k) denotes a k-th value in a pseudo-random sequence of the channel measurement reference signal, i denotes an index of the target antenna port, a RS denotes a power factor of the channel measurement reference signal, denotes a complex value of the channel measurement reference signal mapped on a k-th subcarrier.

10. The method of claim 3, wherein, mapping the channel measurement reference signal onto X subcarriers of the respective carrier comprises mapping the channel measurement reference signal onto 52 valid subcarriers of 157 subcarriers of the carrier, the 52 valid subcarriers being subcarriers of the 157 subcarriers with indices .

11. The method of claim 10, wherein, The complex value of the channel measurement reference signal mapped on each valid subcarrier of the 52 valid subcarriers satisfies: wherein n denotes an index of the wireless frame, I denotes an index of the time domain symbol, k denotes an index of a corresponding subcarrier, r n,l (k) denotes a k-th value in a pseudo-random sequence of the channel measurement reference signal, i denotes an index of the target antenna port, a RS denotes a power factor of the channel measurement reference signal, denotes a complex value of the channel measurement reference signal mapped on a k-th subcarrier.

12. The method of claim 3, wherein, mapping the channel measurement reference signal onto X subcarriers of the respective carrier comprises mapping the channel measurement reference signal onto 78 valid subcarriers of 157 subcarriers of the carrier, the 78 valid subcarriers being subcarriers of the 157 subcarriers with indices .

13. The method of claim 12, wherein, The complex value of the channel measurement reference signal mapped on each valid subcarrier of the 78 valid subcarriers satisfies: wherein n denotes an index of the radio frame, 1 denotes an index of the time domain symbol, k denotes an index of a respective subcarrier, r n,l (k) denotes a k-th value in a pseudo-random sequence of the channel measurement reference signal, i denotes an index of the target antenna port, a RS denotes a power factor of the channel measurement reference signal, denotes a complex value of the channel measurement reference signal mapped on a k-th subcarrier.

14. The method of claim 3, wherein, mapping the channel measurement reference signal onto X subcarriers of the respective carrier comprises mapping the channel measurement reference signal onto 78 valid subcarriers of 157 subcarriers of the carrier, the 78 valid subcarriers being subcarriers of the 157 subcarriers with indices .

15. The method of claim 14, wherein, The complex value of the channel measurement reference signal mapped on each valid subcarrier of the 78 valid subcarriers satisfies: wherein n denotes an index of the radio frame, 1 denotes an index of the time domain symbol, k denotes an index of a respective subcarrier, r n,l (k) denotes a k-th value in a pseudo-random sequence of the channel measurement reference signal, i denotes an index of the target antenna port, a RS denotes a power factor of the channel measurement reference signal, denotes a complex value of the channel measurement reference signal mapped on a k-th subcarrier.

16. The method of any one of claims 7, 9, 11, 13, or 15, wherein, a RS equal to 1, or 17. The method according to any of claims 3-16, characterized by, The value mapped on the direct current subcarrier is 0.

18. A reference signal transmission method, comprising: The method comprises: Receiving high layer signaling or physical layer control information, wherein the high layer signaling or physical layer control information comprises target configuration information, and the target configuration information is used to indicate a mapping manner of a channel measurement reference signal to be sent on one time domain symbol of one radio frame in time domain in frequency domain, and the mapping manner is one of a plurality of candidate mapping manners; According to the mapping manner indicated by the target configuration information, the channel measurement reference signal is mapped onto X subcarriers of a corresponding carrier, wherein the carrier is composed of 157 consecutive subcarriers, and the X is less than or equal to 157; The channel measurement reference signal is sent on the X subcarriers through a target antenna port.

19. The method of claim 18, wherein, The channel measurement reference signal comprises a channel state information reference signal (CSI-RS) or a sounding reference signal (SRS).

20. The method of claim 18 or 19, wherein, The 157 subcarriers of the carrier are sequentially numbered and indexed from 0 to 156 in order of frequency from low to high, wherein the subcarrier with index 78 is a direct current subcarrier, and the other subcarriers are all valid subcarriers.

21. The method according to any of claims 18-20, characterized by, The target configuration information occupies 1 bit, and the number of the plurality of candidate mapping manners is two.

22. The method according to any one of claims 18-20, characterized by, The target configuration information occupies 2 bits, and the number of the plurality of candidate mapping manners is three or four.

23. The method according to any of claims 18-20, characterized by, The target configuration information packet occupies 3 bits, and the number of the plurality of candidate mapping manners is five or six.

24. The method according to any one of claims 18-23, characterized by, The plurality of candidate mapping manners include at least two of the following: A first mapping manner, the first mapping manner indicating that the channel measurement reference signal is mapped onto each of the 157 subcarriers of the carrier; a second mapping mode, the second mapping mode indicating to map the channel measurement reference signal onto 52 valid subcarriers of the 157 subcarriers of the carrier, the 52 valid subcarriers being subcarriers of the 157 subcarriers with indices ​ a third mapping mode, indicating that the channel measurement reference signal is mapped onto 52 valid subcarriers in the 157 subcarriers of the carrier, the 52 valid subcarriers being subcarriers with indexes in the 157 subcarriers. A fourth mapping manner indicates that the channel measurement reference signal is mapped onto 52 valid subcarriers in 157 subcarriers of the carrier, and the 52 valid subcarriers are subcarriers with indexes in the 157 subcarriers. A fifth mapping mode indicates mapping the channel measurement reference signal onto 78 valid subcarriers of the 157 subcarriers of the carrier, the 78 valid subcarriers being subcarriers of the 157 subcarriers with indices ​ A sixth mapping mode indicates that the channel measurement reference signal is mapped onto 78 valid subcarriers out of 157 subcarriers of the carrier, the 52 valid subcarriers being subcarriers of the 157 subcarriers with indexes .

25. The method of claim 24, wherein, When the mapping manner indicated by the target configuration information is the first mapping manner, the complex value of the channel measurement reference signal mapped on each valid subcarrier in the 157 subcarriers satisfies: When the mapping manner indicated by the target configuration information is the second mapping manner, the complex value of the channel measurement reference signal mapped on each of the 52 valid subcarriers satisfies: When the mapping manner indicated by the target configuration information is the third mapping manner, the complex value of the channel measurement reference signal mapped on each of the 52 valid subcarriers satisfies: When the mapping manner indicated by the target configuration information is the fourth mapping manner, the complex value of the channel measurement reference signal mapped on each of the 52 valid subcarriers satisfies: When the mapping manner indicated by the target configuration information is the fifth mapping manner, the complex value of the channel measurement reference signal mapped on each of the 78 valid subcarriers satisfies: When the mapping manner indicated by the target configuration information is the sixth mapping manner, the complex value of the channel measurement reference signal mapped on each of the 78 valid subcarriers satisfies: wherein n denotes an index of the radio frame, 1 denotes an index of the time domain symbol, k denotes an index of a respective subcarrier, r n,l (k) denotes a k-th value in a pseudo-random sequence of the channel measurement reference signal, i denotes an index of the target antenna port, a RS denotes a power factor of the channel measurement reference signal, denotes a complex value of the channel measurement reference signal mapped on a k-th subcarrier.

26. The method of claim 25, wherein, a RS equal to 1, or 27. The method of claim 20, wherein, The value mapped on the direct current subcarrier is 0.

28. An apparatus for reference signal transmission, the apparatus comprising: The apparatus includes a processor and a memory, the memory having instructions stored therein that, when executed by the processor, cause the apparatus to perform the method of any of claims 1-27.

29. A readable storage medium, characterized by, The readable storage medium has instructions stored therein that, when executed on a device, cause the device to perform the method of any of claims 1-27.

30. A computer program product, characterised in that, The computer program product includes a computer program that, when executed on a device, causes the device to perform the method of any of claims 1-27.

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