WO2018036253A1

WO2018036253A1 - Method and device for feeding back channel state information

Info

Publication number: WO2018036253A1
Application number: PCT/CN2017/089411
Authority: WO
Inventors: 颜敏; 陈庆春; 吴涛
Original assignee: 华为技术有限公司
Priority date: 2016-08-23
Filing date: 2017-06-21
Publication date: 2018-03-01
Also published as: CN107786250B; CN107786250A

Abstract

Provided in an embodiment of the invention are a method and device for feeding back channel state information. The method comprises: a receiving end acquiring time-domain channel state information (CSI) of respective antenna pairs; and the receiving end transmitting, to a transmitting end, and according to the time-domain CSI of the respective antenna pairs, time-domain CSI packets, wherein the time-domain CSI packets are used to indicate, for the transmitting end, a position of a field containing a valid path of each antenna pair, and valid path gain information of a path corresponding to each antenna pair, the position of the field containing the valid path is used to instruct the transmitting end to determine, according to the position of the field containing the valid path and a preset unit time delay, time delay information of the valid path, and the valid path is one of the paths which has a gain greater than a preset gain threshold. The method significantly reduces overheads of feeding back CSI to a transmitting end by a receiving end.

Description

Channel state information feedback method and device

The present application claims the priority of the CN patent application filed on August 23, 2016, the Chinese Patent Application No. No. No. No. No. No. No. No. No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No in.

Technical field

The present application relates to communication technologies, and in particular, to a method and device for feeding back channel state information.

Background technique

In today's wireless communication systems, many techniques are employed to improve system performance, such as scheduling, precoding, power control techniques, and adaptive scheduling techniques. These technologies require the terminal to obtain accurate channel state information ( Channel State Information (CSI), so that the terminal can send data according to the CSI. Currently, there are two methods for obtaining channel state information: one is that the sender estimates the CSI when the data is currently transmitted, and the other is that the receiver estimates the CSI and then feeds back to the sender. For the case where the CSI is estimated by the transmitting end, it is applicable to a scenario or system in which channel reciprocity is established, for example, a Time Division Long Term Evolution (TD-LTE) system; estimating CSI and receiving feedback for the receiving end. In the case of the transmitting end, it is applicable to a scenario in which channel reciprocity is poor or not established, such as a Frequency Division Long Term Evolution (EDD-LTE) system.

As the bandwidth of the communication system increases, the feedback amount of the CSI estimated by the receiving end also increases exponentially. The feedback amount of the CSI is reduced to improve the spectrum utilization and optimize the system performance. Therefore, the feedback of the CSI restricts the performance improvement of the whole system. . In the Institute of Electrical and Electronics Engineers (IEEE) 802.11n/ac system, the channel estimation module estimates the channel gain on each subcarrier, and the CSI feeds back the frequency domain CSI information, due to 802.11. In n system, the number of subcarriers is small, and the frequency domain feedback overhead is not large. However, IEEE802.11ay adopts technologies such as channel aggregation and Multiple-Input Multiple-Output (MIMO), which have many Subcarriers, using frequency domain CSI feedback will bring great overhead, so the frequency domain feedback scheme is not applicable to the IEEE802.11ay system; in the IEEE802.11ad system, when the time domain CSI feedback is performed, it will be the time of all taps. After the information is quantized and then fed back, the 11ay system adopts technologies such as channel aggregation and MIMO, and the number of channel taps is large. The feedback scheme also brings great feedback overhead.

Therefore, in the IEEE 802.11ay system, how to reduce the delay feedback overhead of CSI has become a technical problem to be solved at present.

Summary of the invention

The embodiment of the present invention provides a method and a device for feeding back channel state information, so as to solve the technical problem that the CSI feedback solution in the prior art cannot be applied to the IEEE 802.11ay system, that is, the delay feedback overhead of the CSI cannot be reduced.

In a first aspect, the embodiment of the present application provides a method for feeding back channel state information, including:

The receiving end acquires time domain channel state information CSI between each pair of antennas;

The receiving end sends a time domain CSI encapsulation packet to the transmitting end according to the time domain CSI between the antenna pairs; The time domain CSI encapsulation packet is used to indicate to the sending end, the field position where each effective path between each antenna pair is located, and the effective path gain information of the path corresponding to each antenna pair; the field where the effective path is located The location is used to indicate that the sending end determines the delay information of the effective path according to the field position where the effective path is located and the preset unit delay; the effective path is that the gain in the path is greater than the preset gain threshold. path.

The method for feeding back channel state information provided by the foregoing first aspect, the time domain CSI between each antenna pair is obtained by the receiving end, and the time domain CSI encapsulation packet is sent to the transmitting end according to the time domain CSI between each antenna pair, The sending end obtains the field position of the effective path between each antenna pair according to the time domain CSI encapsulation packet, and further determines the delay information of the effective path according to the field position where the effective path is located and the preset unit delay, which does not need to be The receiving end quantizes the delay information of all the effective paths between each antenna pair and feeds back the information to the transmitting end, which greatly saves the delay feedback overhead of the receiving end.

In a possible design, the time domain CSI encapsulation packet includes a delay indication field, an effective path indication field, and an effective path gain indication field;

The delay indication field is used to indicate that a last effective path between any pair of antennas corresponds to a byte number on the effective path indication field;

Each byte in the valid path indication field corresponds to 8 paths, and the effective path indication field is used to indicate to the sending end a field position where each valid path between the pair of antennas is located, so that The sending end acquires the delay information of the effective path according to the field position where the effective path is located and the unit delay;

The effective path gain indication field is used to indicate to the transmitting end, effective path gain quantization information of a path corresponding to each antenna pair.

In one possible design, the delay indication field is an 8-bit indication field.

In one possible design, the delay indication field is also used to characterize the length of the valid path indication field.

The feedback method of the channel state information provided by each of the above possible designs is to use the different fields to represent the location of the field where each valid path between each pair of antennas is located, so that the sender can according to the field of each valid path. The location obtains the delay information of the effective path between the pairs of antennas, and does not need the receiving end to quantize the delay information of all the effective paths between each pair of antennas, and then feeds back the information to the transmitting end, which greatly saves the delay feedback of the receiving end. On the other hand, when the number of paths between an antenna pair is greater than 63, the delay indication field and the setting of 8 paths corresponding to one byte in the effective path indication field can be used to send more paths to the transmitting end. The location of the field, so that the sender can obtain the delay information on all the effective paths between the pair of antennas. Therefore, the embodiment of the present application can be limited by the maximum of 63 channel taps supported by one antenna pair in the 802.11ad. The feedback efficiency and feedback flexibility of the receiving end are greatly improved.

In a possible design, the receiving end sends a time domain CSI encapsulation packet to the sending end according to the time domain CSI between the antenna pairs, and specifically includes:

The receiving end determines a time domain multiple input multiple output MIMO channel matrix according to the time domain CSI between the antenna pairs, wherein the time domain MIMO channel matrix includes a channel impulse response of at least one path, and one path includes At least one path;

The receiving end encodes a path on each path in the time domain MIMO channel matrix by a byte, and obtains a bit array corresponding to each path according to the encoded path, and each path on the path The last effective path corresponds to the byte number L on the bit array and the number P of effective paths on each of the paths; wherein each bit of the bit array corresponds to a path on the path;

The receiving end performs binary coding on each L corresponding to the path, and uses the coded L corresponding to each path as a delay indication field of each of the paths;

The receiving end deletes the bit located after the L in the bit array corresponding to each path according to the L corresponding to each path, obtains a new bit array, and uses the new bit array as each An effective path indication field of the path;

The receiving end obtains the effective path gain quantization information of each of the paths according to the number of effective paths P on each of the paths and the gain information quantized by each effective path on each of the paths, and The effective path gain quantization information is used as an effective path gain indication field of each of the paths;

Determining, by the receiving end, the time domain CSI encapsulation packet according to a delay indication field of each of the paths, an effective path indication field of each of the paths, and an effective path gain indication field of each of the paths, and The sending end sends the time domain CSI encapsulation packet.

In a possible design, the receiving end determines the time domain MIMO channel matrix according to the time domain CSI between the antenna pairs, and specifically includes:

The receiving end respectively numbers the transmitting antenna and the receiving antenna;

The receiving end obtains, according to the number of the transmitting antenna and the number of the receiving antenna, a channel impulse response between antenna pairs formed by each transmitting antenna and each receiving antenna in sequence;

The receiving end acquires the time domain MIMO channel matrix according to a channel impulse response between each antenna pair.

Receiving, by the receiving end, at least one first beam optimization protocol BRP frame sent by the sending end;

Receiving, by the receiving end, a TRN field in each of the first BRP frames;

The receiving end measures a channel impulse response between each antenna pair according to each TRN domain, and determines the time domain MIMO according to a measurement order of each TRN domain and a channel impulse response between each antenna pair. Channel matrix.

In a possible design, after the receiving end determines the time domain MIMO channel matrix according to the time domain CSI between the antenna pairs, the receiving end further includes:

The receiving end sends an order of arrangement of each channel impulse response in the time domain MIMO channel matrix to the transmitting end.

In a possible design, the time domain is determined according to a delay indication field of each of the paths, an effective path indication field of each of the paths, and an effective path gain indication field of each of the paths. The CSI encapsulates the packet, and sends the time domain CSI encapsulation package to the sending end, which specifically includes:

The receiving end encapsulates the delay indication field, the effective path indication field, and the effective path gain indication field of the same path into a time domain CSI encapsulation packet corresponding to the path;

The receiving end sends the time domain CSI encapsulation packet corresponding to each path to the sending end according to the order of the channel impulse responses in the time domain MIMO channel matrix.

The receiving end encapsulates the delay indication field, the effective path indication field, and the effective path gain indication field corresponding to each path into a time domain CSI encapsulation sub-package;

The receiving end encapsulates each time domain CSI encapsulation sub-packet into the time domain CSI encapsulation packet according to the order of arrangement of the channel impulse responses in the time domain MIMO channel matrix, and sends the packet to the sending end.

In a possible design, the sending the time domain CSI encapsulation packet to the sending end includes:

The receiving end performs coding and modulation processing on the time domain CSI encapsulation packet to obtain a modulated CSI encapsulation packet;

The receiving end carries the modulated CSI encapsulation packet in a second BRP frame and sends the packet to the sending end.

In a possible design, the second BRP frame carries the first indication information and the second indication information, where the first indication information is used to indicate to the sending end that the second BRP frame carries the The modulated CSI encapsulation packet, the second indication information is used to indicate to the sending end the number of valid paths on each path.

The method for feeding back channel state information provided by each of the above possible designs, the receiving end determines the time domain MIMO channel matrix according to the time domain CSI between the pair of antennas, and on each path in the time domain MIMO channel matrix The path is encoded in bytes, and the bit array corresponding to each path is obtained according to the encoded path, and the last valid path on each path corresponds to the byte number L on the bit array, and the number of effective paths on each path. Then, the receiving end performs binary encoding on the L corresponding to each path, and uses the encoded L corresponding to each path as the delay indication field of each path; and, according to each path, the L corresponding to each path is deleted. a bit in the bit array corresponding to the strip path after the L, to obtain a new bit array, and the effective path indication field of each path of the new bit array; and, the receiving end according to the number of effective paths on each path P and the gain information quantized by each effective path on each path obtain the effective path gain quantization information of each of the paths, and use the effective path gain quantization information as each path The effective path gain indication field, so that the time domain CSI encapsulation packet is determined and sent to the transmitting end according to the delay indication field of each path, the effective path indication field of each path, and the effective path gain indication field of each path. The time domain CSI encapsulation packet obtained by the method can represent the location of the field where each effective path between each pair of antennas is located to the transmitting end, so that the transmitting end can obtain the effective relationship between the pairs of antennas according to the position of the field where each effective path is located. The delay information of the path does not need to be quantized by the receiving end for the delay information of all effective paths between each antenna pair, and is then fed back to the transmitting end, which greatly saves the delay feedback overhead of the receiving end; on the other hand, by deleting L The subsequent characterization of the invalid path bit reduces the length of the effective path indication field, which reduces the size of the time domain CSI encapsulation packet, further reducing the time domain feedback overhead of the receiving end; further, when the number of paths between one antenna pair If the value is greater than 63, the delay indication field and the one of the valid path indication fields can be set to 8 paths. The location of the field, so that the sender can obtain the delay information on all the effective paths between the pair of antennas. Therefore, the embodiment of the present application can be limited by the maximum of 63 channel taps supported by one antenna pair in the 802.11ad. The feedback efficiency and feedback flexibility of the receiving end are greatly improved.

In a possible design, the receiving end sends the time domain CSI encapsulation packet to the transmitting end according to the time domain CSI between the antenna pairs, and the method further includes:

The receiving end receives the third indication information sent by the sending end, where the third indication information is used to indicate the number of transmitting antennas to the receiving end;

The receiving end determines whether to perform time domain CSI feedback according to the number of the transmitting antennas and the number of receiving antennas.

The method provided by the possible design can determine whether the receiving end needs to perform time domain CSI feedback according to the number of transmitting antennas and the number of receiving antennas, thereby avoiding blindly determining the time domain CSI encapsulation packet at the receiving end, thereby greatly reducing the receiving. End processing overhead.

In a second aspect, the embodiment of the present application provides a feedback device for channel state information, including: an acquiring module, configured to acquire time domain channel state information CSI between pairs of antennas;

a sending module, configured to send a time domain CSI encapsulation packet to the transmitting end according to the time domain CSI between the antenna pairs, where the time domain CSI encapsulation packet is used to indicate to the transmitting end between each antenna pair Field bit for each valid path And the effective path gain information of the corresponding path of each antenna pair; the field position of the effective path is used to indicate that the sending end determines the location according to the field location of the effective path and the preset unit delay The delay information of the effective path; the effective path is a path in which the gain in the path is greater than a preset gain threshold.

In a possible design, the foregoing time domain CSI encapsulation packet includes a delay indication field, a valid path indication field, and a valid path gain indication field; the delay indication field is used to represent the last valid between any pair of antennas The path corresponds to the byte number on the valid path indication field; each byte in the valid path indication field corresponds to 8 paths, and the effective path indication field is used to indicate the antenna pair to the sending end. The location of the field in which each valid path is located, so that the sending end acquires the delay information of the effective path according to the field position where the effective path is located and the unit delay; the effective path gain indication field An effective path gain quantization information for indicating to the transmitting end a path corresponding to each antenna pair.

In a possible design, the foregoing sending module specifically includes:

a first determining unit, configured to determine a time domain multiple input multiple output MIMO channel matrix according to time domain CSI between the antenna pairs, wherein the time domain MIMO channel matrix includes a channel impulse response of at least one path, A path includes at least one path;

a first coding unit, configured to encode a path on each path in the time domain MIMO channel matrix by a byte, and obtain a bit array corresponding to each path according to the encoded path, and each of the The last effective path on the path corresponds to the byte number L on the bit array and the number P of effective paths on each of the paths; wherein each bit of the bit array corresponds to a path on the path;

a second coding unit, configured to perform binary coding on each L corresponding to the path, and use the coded L corresponding to each path as a delay indication field of each path;

a deleting unit, configured to delete a bit located after the L in each bit array corresponding to each path according to L corresponding to each path, to obtain a new bit array, and use the new bit array as An effective path indication field for each of the paths;

a quantization unit, configured to obtain, according to the number of effective paths P on each of the paths and the gain information quantized by each effective path on each of the paths, obtain effective path gain quantization information of each of the paths, and Using the effective path gain quantization information as an effective path gain indication field of each of the paths;

a second determining unit, configured to determine the time domain CSI encapsulation packet according to a delay indication field of each of the paths, an effective path indication field of each of the paths, and an effective path gain indication field of each of the paths ;

And a sending unit, configured to send the time domain CSI encapsulation packet to the sending end.

In a possible design, the first determining unit is specifically configured to respectively number the transmitting antenna and the receiving antenna, and obtain the sequence according to the number of the transmitting antenna and the number of the receiving antenna. A channel impulse response between antenna pairs formed by each of the transmit antennas and each of the receive antennas, and the time domain MIMO channel matrix is obtained based on a channel impulse response between each antenna pair.

In a possible design, the first determining unit is configured to receive at least one first beam optimization protocol BRP frame sent by the sending end, and acquire a TRN field in each of the first BRP frames; The channel impulse response between each antenna pair is measured according to each TRN domain, and the time domain MIMO channel matrix is determined according to the measurement order of each TRN domain and the channel impulse response between each antenna pair.

In a possible design, the sending unit is further configured to send an arrangement order of each channel impulse response in the time domain MIMO channel matrix to the sending end.

In a possible design, the second determining unit is configured to encapsulate the delay indication field, the effective path indication field, and the effective path gain indication field of the same path into a time domain CSI encapsulation packet corresponding to the path; The sending unit is configured to send a time domain CSI encapsulation packet corresponding to each path to the sending end according to an arrangement order of each channel impulse response in the time domain MIMO channel matrix.

In a possible design, the second determining unit is configured to encapsulate the delay indication field, the effective path indication field, and the effective path gain indication field corresponding to each path into a time domain CSI encapsulation sub-package, and according to The order of arrangement of the channel impulse responses in the time domain MIMO channel matrix encapsulates each time domain CSI encapsulation sub-packet into the time domain CSI encapsulation packet, and is sent to the transmitting end by the sending unit 117.

In a possible design, the foregoing second determining unit is further configured to perform coding and modulation processing on the time domain CSI encapsulation packet to obtain a modulated CSI encapsulation packet, where the sending unit is specifically configured to use the modulation. The subsequent CSI encapsulation packet is carried in the second BRP frame and sent to the transmitting end.

In a possible design, the second BRP frame carries the first indication information and the second indication information, where the first indication information is used to indicate to the sending end that the modulation is carried in the second BRP frame. The second CSI encapsulation packet is used to indicate to the sending end the number of valid paths on each path.

In a possible design, the above device further includes a receiving module and a determining module;

a receiving module, configured to receive third indication information that is sent by the sending end, where the third indication information is used to indicate, to the receiving end, the number of transmitting antennas;

The determining module is configured to determine whether to perform time domain CSI feedback according to the number of the transmitting antennas and the number of receiving antennas.

The beneficial effects of the feedback device of the channel state information provided by the second aspect and the possible design of the second aspect may be referred to the first aspect and the beneficial effects brought by the possible designs of the first aspect. No longer.

In a third aspect, an embodiment of the present application provides a communications device, including:

a processor, configured to acquire time domain channel state information CSI between each pair of antennas;

a transmitter, configured to send a time domain CSI encapsulation packet to the transmitting end according to the time domain CSI between the antenna pairs, where the time domain CSI encapsulation packet is used to indicate to the transmitting end between each antenna pair The field position of each effective path and the effective path gain information of the corresponding path of each antenna pair; the field position of the effective path is used to indicate that the sending end is based on the field position and preset of the effective path The unit delay determines the delay information of the effective path; the effective path is a path in the path where the gain is greater than a preset gain threshold.

The effective path gain indication field is used to indicate to the sending end that the effective path increase of each antenna pair corresponding path Benefit quantitative information.

In a possible design, the processor is further configured to determine a time domain multiple input multiple output MIMO channel matrix according to time domain CSI between the antenna pairs, and in the time domain MIMO channel matrix The path on each path is encoded in bytes, and the bit array corresponding to each path is obtained according to the encoded path, and the last valid path on each path corresponds to the byte number on the bit array. L, the number P of effective paths in each of the paths; and binary coding of L corresponding to each of the paths, and encoding L corresponding to each path as each of the paths a delay indication field, and deleting, according to L corresponding to each of the paths, a bit located after the L in a bit array corresponding to each of the paths, obtaining a new bit array, and the new bit An array is used as an effective path indication field for each of the paths; and each piece is obtained according to the number of effective paths P on each of the paths and the gain information quantized by each effective path on each of the paths Effective path gain Information, and the effective path gain quantization information is used as an effective path gain indication field of each of the paths; and, according to each of the paths, a delay indication field, an effective path indication field of each of the paths, and An effective path gain indication field of each of the paths, determining the time domain CSI encapsulation packet, and sending the time domain CSI encapsulation packet to the sending end by using the transmitter;

The time domain MIMO channel matrix includes a channel impulse response of at least one path, and one path includes at least one path; each bit of the bit array corresponds to a path on the path.

In a possible design, the processor determines the time domain MIMO channel matrix according to the time domain CSI between the antenna pairs, and specifically includes:

The processor is specifically configured to respectively number the transmitting antenna and the receiving antenna, and obtain each transmitting antenna and each receiving antenna in sequence according to the number of the transmitting antenna and the number of the receiving antenna. A channel impulse response between the pair of antennas is constructed, and the time domain MIMO channel matrix is obtained based on a channel impulse response between each pair of antennas.

In a possible design, the communication device further includes a receiver;

The receiver is configured to receive at least one first beam optimization protocol BRP frame sent by the sending end;

The processor is specifically configured to acquire a TRN field in each of the first BRP frames, and measure a channel impulse response between each antenna pair according to each TRN domain, and according to a measurement order of each TRN domain. And determining a time domain MIMO channel matrix with a channel impulse response between each antenna pair.

In a possible design, the transmitter is further configured to: when the processor determines a time domain MIMO channel matrix according to a time domain CSI between the antenna pairs, the time domain MIMO channel matrix The order in which the channel impulse responses are transmitted is sent to the transmitting end.

In a possible design, the processor is specifically configured to encapsulate a delay indication field, an effective path indication field, and an effective path gain indication field of the same path into a time domain CSI encapsulation packet corresponding to the path;

The transmitter is specifically configured to send a time domain CSI encapsulation packet corresponding to each path to the sending end according to an arrangement order of each channel impulse response in the time domain MIMO channel matrix.

In a possible design, the processor is specifically configured to encapsulate the delay indication field, the effective path indication field, and the effective path gain indication field corresponding to each path into a time domain CSI encapsulation sub-package, and according to the The order of arrangement of the channel impulse responses in the time domain MIMO channel matrix encapsulates each time domain CSI encapsulation sub-packet into the time domain CSI encapsulation packet, and then sends the same to the sender through the transmitter.

In a possible design, the processor is further configured to perform coding and modulation processing on the time domain CSI encapsulation packet to obtain a modulated CSI encapsulation packet;

The transmitter is specifically configured to carry the modulated CSI encapsulation packet in a second BRP frame and send the packet to the sending end.

In a possible design, the receiver is further configured to receive, before the transmitter sends a time domain CSI encapsulation packet to the transmitting end according to a time domain CSI between the antenna pairs. The third indication information sent by the sending end, where the third indication information is used to indicate the number of sending antennas to the receiving end;

The processor is further configured to determine whether to perform time domain CSI feedback according to the number of the transmitting antennas and the number of receiving antennas.

The beneficial effects of the communication device provided by the above-mentioned third aspect and the possible design of the third aspect can be referred to the advantages of the first aspect and the possible designs of the first aspect, and are not described herein again.

DRAWINGS

FIG. 1 is a schematic structural diagram of a WLAN system according to an embodiment of the present disclosure;

2 is a schematic flowchart of Embodiment 1 of a method for feeding back channel state information according to an embodiment of the present disclosure;

FIG. 3 is a schematic structural diagram 1 of a time domain CSI encapsulation package according to an embodiment of the present disclosure;

4 is a schematic structural diagram 2 of a time domain CSI encapsulation package according to an embodiment of the present disclosure;

FIG. 5 is a schematic flowchart of Embodiment 2 of a method for feeding back channel state information according to an embodiment of the present disclosure;

FIG. 6 is a schematic flowchart 1 of acquiring a time domain MIMO channel matrix according to an embodiment of the present disclosure;

FIG. 7 is a schematic flowchart 2 of acquiring a time domain MIMO channel matrix according to an embodiment of the present disclosure;

FIG. 8 is a schematic diagram of changes in a bit array provided by an embodiment of the present application; FIG.

FIG. 9 is a schematic diagram of a new bit array provided by an embodiment of the present application; FIG.

10 is a schematic flowchart 1 of a process for determining and transmitting a time domain CSI encapsulation packet by a receiving end according to an embodiment of the present disclosure;

FIG. 11 is a schematic flowchart 2 of a process for determining and transmitting a time domain CSI encapsulation packet by a receiving end according to an embodiment of the present disclosure;

FIG. 12 is a schematic structural diagram 3 of a time domain CSI encapsulation package according to an embodiment of the present disclosure;

FIG. 13 is a schematic structural diagram 4 of a time domain CSI encapsulation package according to an embodiment of the present disclosure;

FIG. 14 is a schematic structural diagram of Embodiment 1 of a device for feeding back channel state information according to an embodiment of the present disclosure;

FIG. 15 is a schematic structural diagram of Embodiment 2 of a device for feeding back channel state information according to an embodiment of the present disclosure;

FIG. 16 is a schematic structural diagram of an embodiment of a communication device according to an embodiment of the present disclosure.

detailed description

The method for feeding back the channel state information in the embodiment of the present application can be applied to a Wireless Local Area Networks (WLAN), and can also be applied to a Frequency Division Long Term Evolution (FDD-LTE). )system. Taking the WLAN network as an example, the current WLAN adopts the standard of the Institute of Electrical and Electronics Engineers (IEEE) 802.11 series, that is, the method according to the embodiment of the present application can be applied. The IEEE802.11n/ac system is also applicable to the IEEE802.11ad system, and is also applicable to the IEEE802.11ay system, which employs technologies such as channel aggregation and MIMO. The station (Station, referred to as STA) and the access point (AP) are the basic components of the WLAN.

The AP is an access point for mobile users to enter the wired network. It is mainly deployed in the home, inside the building, and inside the campus. The typical coverage radius is tens of meters to hundreds of meters. Of course, it can also be deployed outdoors. An AP is equivalent to a bridge connecting a wired network and a wireless network. Its main function is to connect the wireless network clients together and then connect the wireless network to the Ethernet. Specifically, the AP may be a terminal device or a network device with a WiFi (English: Wireless Fidelity) chip. Optionally, the AP may be a device supporting the 802.11ax system. Further, the AP may be a device supporting multiple WLAN technologies such as 802.11ac, 802.11n, 802.11g, 802.11b, and 802.11a. In this embodiment, The AP can also be a device that supports 802.11ad and 802.11ay WLAN standards. Alternatively, the AP in the embodiment of the present application may be replaced by a Personal Basic Service Set Control Point (PCP), and the PCP may also communicate with multiple STAs.

The STA is generally a client device in the WLAN. The STA may be mobile or fixed, and is the most basic component of the wireless local area network. The STA may be a wireless communication chip, a wireless sensor, or a wireless communication terminal. For example: mobile phone supporting WiFi communication function, tablet computer supporting WiFi communication function, set-top box supporting WiFi communication function, smart TV supporting WiFi communication function, smart wearable device supporting WiFi communication function, and vehicle communication supporting WiFi communication function Devices and computers that support WiFi communication.

The sending end of the embodiment of the present application may be an AP, or may be an STA, and may be another communication device. The receiving end may be an AP, an STA, or another communication device. When the sending end is an AP, the sending end is an AP. The receiving end can be an STA. When the sending end is an STA, the receiving end can be an STA or an AP. In summary, the specific embodiments of the sending end and the receiving end are not limited in the embodiment of the present application.

As shown in Figure 1, the 802.11ay in the WLAN network is used as an example. The network includes a transmitting end, a receiving end, and a reflective object. The transmitting end includes multiple transmitting antennas, and the receiving end includes multiple receiving antennas. The type of the scene reflection object is different. For example, if it is an indoor scene, the reflection object may be a wall, a decoration, or the like, and if it is an outdoor scene, the reflection object may be a building, a vehicle, a pedestrian, or the like. The transmitting end and the receiving end in FIG. 1 use MIMO technology for data transmission. It should be noted that the antenna pair according to the embodiment of the present application may include a transmitting antenna at the transmitting end and a receiving antenna at the receiving end. The antenna pair corresponds to a path. If the frequency domain starts from a range, the path includes multiple subcarriers, each of which is a sub-carrier. The carrier is a frequency domain channel; if starting from the time domain, a path includes multiple paths, there are straight-line propagation paths, and there are other emission paths (ie, multipath propagation).

The feedback method of the CSI involved in the embodiment of the present application is mainly for the problem that the receiving end estimates the CSI and how to save the feedback overhead during the process of feeding back to the sending end. In the prior art, in the process of performing channel state information CSI feedback, the two feedback modes are respectively: frequency domain CSI feedback and time domain CSI feedback, where the receiving end of the frequency domain CSI feedback mode feeds back on each subcarrier. Gain information, in the time domain CSI feedback mode, the receiving end feedbacks the gain information and the delay information on each path, and the delay information refers to the transmission delay of a path relative to the path of the straight line propagation, and an antenna The number of multipaths between pairs is much smaller than the number of subcarriers between the pairs of antennas. Therefore, the time domain CS feedback mode is less expensive than the frequency domain CSI feedback mode. For In the 802.11n/ac system, the channel estimation module estimates the channel gain on each subcarrier, and the CSI feeds back the frequency domain CSI information. Since the number of subcarriers in the 802.11n/ac system is small, the frequency domain feedback overhead is not Large, but IEEE802.11ay uses technologies such as channel aggregation and MIMO. There are many subcarriers. The frequency domain CSI feedback will bring great overhead. Therefore, the frequency domain feedback scheme is not applicable to the IEEE802.11ay system. On the one hand, the IEEE802.11ad system uses time domain CSI feedback, which quantizes the delay information of all taps and feeds back, and if the 11ay system adopts this time domain CSI feedback mode, the 11ay system uses the channel. Techniques such as convergence and MIMO have a large number of channel taps, which need to quantize the delay information of all channel taps and feedback, and the feedback delay cost is large, and the current time domain CSI feedback scheme can only support 63 taps at most. Feedback on the delay information.

Therefore, the method and device for feeding back channel state information provided by the embodiments of the present application are to solve the technical problem that the CSI feedback solution in the prior art cannot be applied to the IEEE 802.11ay system, that is, the delay feedback overhead of the CSI cannot be reduced.

The technical solutions of the present application are described in detail below with specific embodiments. The following specific embodiments may be combined with each other, and the same or similar concepts or processes may not be described in some embodiments.

FIG. 2 is a schematic flowchart diagram of Embodiment 1 of a method for feeding back channel state information according to an embodiment of the present disclosure. In this embodiment, the receiving end sends a time domain CSI encapsulation packet to the transmitting end by using the acquired time domain CSI between the transmitting end and the receiving end, so as to reduce the delay by using the time domain CSI encapsulation packet. The specific process of feedback overhead. As shown in FIG. 2, the method includes the following steps:

S101: The receiving end acquires a time domain CSI between each pair of antennas.

Specifically, since the channel estimation domain (CEF) in the IEEE802.11ay system uses single-carrier transmission, the receiving end obtains the time domain CSI between each antenna pair correspondingly in the IEEE802.11ay system. There is a technical description and will not be described here. The time domain CSI of an antenna pair includes delay information of each path between the pair of antennas and gain information of each path. In fact, the time domain CSI of one antenna pair is the channel puncturing corresponding to the pair of antennas. In response to the impulse response, the channel impulse response is a row vector comprising a plurality of paths of delay and a plurality of paths of gain.

S102: The receiving end sends a time domain CSI encapsulation packet to the sending end according to the time domain CSI between the antenna pairs.

The time domain CSI encapsulation packet is used to indicate to the sending end, the field position where each effective path between each antenna pair is located, and the effective path gain information of the path corresponding to each antenna pair; where the effective path is located The field location is used to indicate that the sending end determines the delay information of the effective path according to the field position where the effective path is located and the preset unit delay; the effective path is that the gain in the path is greater than the preset gain. The diameter of the threshold.

Specifically, after the receiving end obtains the time domain CSI between each antenna pair, the time domain CSI encapsulation packet is generated according to the time domain CSI, and the specific generation manner is not limited in this embodiment, as long as the generated time domain is generated. The CSI encapsulation packet may indicate to the transmitting end the field position where each effective path between each antenna pair is located, and the effective path gain information of the path corresponding to each antenna pair. The effective path here refers to the path whose gain is greater than the preset gain threshold, and the path whose gain is less than or equal to the preset gain threshold is called the invalid path. Optionally, the time domain CSI encapsulation packet may be an encapsulation packet sent by one antenna pair, and the receiving end sends the corresponding time domain CSI encapsulation packet of each antenna pair to the transmitting end one by one, the time domain CSI encapsulation packet indicates It is the position of the field where each effective path of the antenna pair is located. It should be noted that the position of the field is the effective path relative to the straight line between the pair of antennas. The relative position of the path. Optionally, the time domain CSI encapsulation packet HIA may be a time domain CSI encapsulation sub-packet of a plurality of antenna pairs, and the time domain CSI encapsulation is sent to the transmitting end by the receiving end. The form of the package is not limited.

S103: The sender obtains the field position of each valid path according to the time domain CSI encapsulation packet, and determines the delay information of each valid path according to the field position where each effective path is located and the preset unit delay.

Specifically, after the sending end receives the time domain CSI encapsulation packet sent by the receiving end, the sending end parses the time domain CSI encapsulation packet. Optionally, if the time domain CSI encapsulation packet is for an antenna pair, that is, The receiving end is sent to the transmitting end one by one. Since the transmitting end can know in advance the order of the pair of antennas when the receiving end sends the time domain CSI encapsulation packet, the transmitting end can know which one of the currently received time domain CSI encapsulation packets is targeted. Antenna pair. Based on this, the transmitting end can perform correct parsing, obtain the position of the field where each effective path between the pair of antennas is located, and then determine each effective path according to the position of the field where each effective path is located and the preset unit delay. The delay information, for example, assumes that the field position of the effective path A with respect to the straight line propagation between the pair of antennas is 8, and the preset unit delay is 8 us, the transmitting end can determine the delay of the effective path A as 64us. Optionally, if the time domain CSI encapsulation packet is for multiple antenna pairs, that is, the receiving end uniformly sends the time domain CSI information of all the antenna pairs to the sending end, because the transmitting end can know that the receiving end is multiple The time domain CSI encapsulation sub-package is encapsulated into a time-domain CSI encapsulation packet encapsulation order. Therefore, the transmitting end can know which antenna pair is used in each time domain CSI encapsulation sub-package in the currently received time domain CSI encapsulation packet. Based on this, the sender can perform correct parsing, obtain the position of each field where each effective path is between each pair of antennas, and then determine each field according to the position of each valid path and the preset unit delay. The delay information of the effective path.

It can be seen from the above description that the receiving end only needs to inform the transmitting end of each valid path between each pair of antennas in the time domain CSI encapsulation packet, and the transmitting end can obtain the delay information of each effective path. The receiving end does not need to quantize the delay information of all the effective paths between each pair of antennas and then feed back the information to the transmitting end, which greatly saves the delay feedback overhead of the receiving end.

In the feedback method of the channel state information provided by the embodiment of the present application, the receiving end acquires the time domain CSI between the antenna pairs, and sends the time domain CSI encapsulation packet to the transmitting end according to the time domain CSI between the antenna pairs. The sending end obtains the field position of the effective path between each antenna pair according to the time domain CSI encapsulation packet, and further determines the delay information of the effective path according to the field position where the effective path is located and the preset unit delay, which does not need to be The receiving end quantizes the delay information of all the effective paths between each antenna pair and feeds back the information to the transmitting end, which greatly saves the delay feedback overhead of the receiving end.

Further, the second embodiment of the present application relates to a possible implementation manner of the foregoing time domain CSI encapsulation package. In the second embodiment of the present application, the time domain CSI encapsulation packet may include a delay indication field, a valid path indication field, and an effective path gain indication field. For details, refer to the structure of the time domain CSI encapsulation package shown in FIG. FIG. 3 is only an example, and the application is not limited thereto.

The delay indication field is used to indicate that a last effective path between any pair of antennas corresponds to a byte number on the effective path indication field; each byte in the effective path indication field corresponds to 8 a path indicator, where the effective path indication field is used to indicate to the sending end, a field location where each valid path between the pair of antennas is located, so that the sending end is based on the field position and location of the effective path Obtaining delay information of the effective path according to the unit time delay; the effective path gain indication field information is used to indicate to the sending end, the corresponding path of each antenna pair The effective path gain quantization information of the path.

Specifically, in the time domain CSI encapsulation packet, the delay indication field is located before the effective path indication field, and the effective path gain indication field is located before the effective path indication field. The delay indication field in this embodiment may be an 8-bit indication field, and may be a more or less bit indication field. The embodiment of the present application does not limit the bit number of the delay indication field. The sender may calculate a decimal value according to the binary bit of the delay indication field, where the value corresponds to the byte number of the last effective path between the pair of antennas corresponding to the valid path indication field; for example Assuming that the delay indication field is an 8-bit indication field of 00001000, and the calculated decimal value is 8, the last valid path between the antenna pairs corresponding to the delay indication field is located in the byte number of the valid path indication field. 8 bytes on.

One byte in the effective path indication field in FIG. 3 corresponds to 8 bits, and one bit corresponds to one path, that is, each byte in the effective path indication field corresponds to 8 paths, and the effective path indication field is used to indicate one to the transmitting end. The position of the field where each effective path between the pair of antennas is located, and the position of the field may specifically be which bit on which byte. It should be noted that the path of the straight line propagation between an antenna pair is located in the first bit on the effective path indication field. Therefore, the field position where the effective path indicated by the effective path indication field is the effective path relative to The bit position of the first bit, for example, continues to indicate that the last effective path between an antenna pair (set the antenna pair is TR1) is located on the 8th byte of the effective path indication field according to the above-mentioned delay indication field 00001000, Assuming that the last effective path is located on the sixth bit of the 8th byte, the field position of the last valid path is 48, and the sender can then according to the position of the field and the preset unit delay. Determining the delay information of the last effective path. Of course, for calculating the effective path corresponding to other bits in the effective path indication field, the delay information can also be obtained in the same manner. Here, only the last effective path is used as an example. .

It can be seen from the description of the foregoing delay indication field and the effective path indication field that if the delay indication field is a field including n bits, the delay indication field may indicate 2 ⁿ byte numbers, and is indicated by the effective path. In the field, a byte number corresponds to 8 paths. Therefore, the delay indication field can indicate at most (2 ⁿ times 8), that is, the coding mode can be used to indicate that the receiving end uses fewer bits. More paths, so that the receiving end can indicate the location of the field where the effective path is located to the transmitting end, so that the transmitting end can obtain the delay information on the effective path between all the antenna pairs, so the embodiment of the present application It can be free from the limitation of up to 63 channel taps in 802.11, which greatly improves the feedback efficiency and feedback flexibility of the receiving end.

Further, for the above-mentioned effective path gain indication field located after the effective path indication field, it is used to indicate to the transmitting end the effective path gain quantization information of the corresponding path of each antenna pair. Assuming that the number of effective paths in a path is P, and the quantized bits are Nb, the quantized size of each effective path gain is 2×Nb, and the quantized gain of the path is P×2×Nb, and the quantization is performed. After the subsequent gain is converted into binary bits, it is stored as the effective path gain quantization information in the effective path gain indication field. In the time domain CSI feedback, not only the delay information of each effective path between each pair of antennas needs to be fed back, but also the effective path gain quantization information of each path corresponding to each antenna is fed back. Therefore, the transmitting end can be based on The effective path gain indication field in the CSI encapsulation packet learns the quantized gain of each channel pair corresponding to the path, thereby providing a good power reference for the data transmission performed by the transmitting end again.

Further, on the basis of the foregoing Embodiment 2, as a possible implementation manner of the foregoing Embodiment 2, the delay indication field in the implementation manner is an 8-bit indication field, and the delay indication field may also be used for characterization. For the length of the valid path indication field, refer to the structure of the CSI package shown in Figure 4.

Specifically, in order to better introduce the structure of the CSI encapsulation packet and the meaning of the field, in the embodiment, the path of an antenna pair (the antenna pair is TR1) is taken as an example: the delay indication field is CSI Feedback Offset subfield. For the field, set the effective path indication field to the CSI Feedback Indication Map subfield field, and set the effective path gain indication field to CSI Information subfield.

As shown in FIG. 4, the delay indication field corresponding to the path of the TR1 is assumed to be 00001000, and the main role of the indication field is to indicate that the last effective path corresponds to the byte number on the effective path indication field. Since one byte in the effective path indication field can correspond to 8 paths, and the 8 bit delay indication field can indicate 2 ⁸ byte numbers, the 8 bit delay indication can indicate up to 2048 paths, which satisfies the 11ay system. Requirements, but also fully consider the backward compatibility of the system.

The delay indicator field indicates the byte number of the last valid path. If L is set, the length of the valid path indication field may be (L×8) bits. That is, the value of the delay indication field may indicate The effective path indicates the length of the field. After the sender obtains the delay indication field, the length of the valid path indication field after the delay indication field is obtained, which may facilitate the deblocking of the sending end.

The method for feeding back the channel state information provided by the embodiment of the present application, by using different fields, is used to describe the position of the field where each effective path exists between the pair of antennas, so that the sender can obtain the position of the field according to each effective path. The delay information of the effective path between the pair of antennas is not required by the receiving end to quantize the delay information of all the effective paths between each pair of antennas, and then feedbacks to the transmitting end, which greatly saves the delay feedback overhead of the receiving end; On the other hand, when the number of paths between an antenna pair is greater than 63, the delay indication field and the setting of 8 paths corresponding to one byte in the effective path indication field may be used to send more paths to the transmitting end. The field position, so that the sender can obtain the delay information on all the effective paths between the pair of antennas. Therefore, the embodiment of the present application can be free from the limitation of supporting up to 63 channel taps by one antenna pair in the 802.11ad. The feedback efficiency and feedback flexibility of the receiver.

FIG. 5 is a schematic flowchart of Embodiment 2 of a method for feeding back channel state information according to an embodiment of the present disclosure. This embodiment relates to a specific process in which the receiving end generates the time domain CSI encapsulation packet according to the time domain CSI between each antenna pair, and sends the time domain CSI encapsulation packet to the transmitting end. Based on the foregoing embodiment, the foregoing S102 may specifically include:

S201: The receiving end determines a time domain MIMO channel matrix according to the time domain CSI between the antenna pairs.

The time domain MIMO channel matrix includes a channel impulse response of at least one path, and one path includes at least one path.

Specifically, after receiving the time domain CSI between the pair of antennas, the receiving end may determine a time domain MIMO channel matrix according to the time domain CSI, where the time domain MIMO channel matrix includes a channel impulse response of at least one path (a The antenna pair corresponds to one path), and one path may include at least one path. Optionally, after the receiving end determines the time domain MIMO channel matrix according to the time domain CSI between the pair of antennas, the receiving end may send the sequence of the impulse response of each channel in the time domain MIMO channel matrix to the sending end. The transmitting end can correctly parse the time domain CSI encapsulation packet sent by the receiving end according to the ranking order.

Optionally, the manner in which the receiving end determines the time domain MIMO channel matrix according to the time domain CSI between the antenna pairs may be implemented in two ways:

The first implementation manner is as follows: See FIG. 6 is a schematic flowchart 1 of the process for acquiring a time domain MIMO channel matrix. As shown in FIG. 6 , the implementation manner specifically includes:

S301: The receiving end respectively numbers the transmitting antenna and the receiving antenna.

Optionally, the receiving end may number the plurality of transmitting antennas of the transmitting end as {1, 2, . . . , Nt}, and number the receiving antennas of the receiving end to be {1, 2, . . . Nr}, and the numbering manner is only one. For example, the manner in which the transmitting antenna and the receiving antenna are numbered in the embodiment of the present application is not limited.

S302: The receiving end obtains a channel impulse response between each transmitting antenna and each antenna pair formed by each receiving antenna according to the number of the transmitting antenna and the number of the receiving antenna.

S303: The receiving end acquires the time domain MIMO channel matrix according to a channel impulse response between each antenna pair.

Specifically, the receiving end may first fix the transmitting antenna i (i starts from 1), arrange the channel impulse response between the receiving antenna and each receiving antenna according to the number, and then obtain the i+1 transmitting antenna and each by i+1 by number. The channel impulse response between the receiving antennas is repeated until the channel impulse response between each transmitting antenna and each receiving antenna pair is obtained, and the channel impulse response between each antenna pair is one line. The vector includes delay information for each path between the pair of antennas and a gain for each path. Based on this, the receiving end can obtain the time domain MIMO channel matrix after obtaining the channel impulse response between each antenna pair.

The second implementation manner is as follows: Referring to FIG. 7 , the flow diagram 2 of the time domain MIMO channel matrix is shown in FIG. 7 , as shown in FIG. 7 , the implementation manner specifically includes:

S401: The receiving end receives at least one first Beam Refinement Protocol (BRP) frame sent by the sending end.

S402: The receiving end acquires a training (Training, abbreviated as TRN) field in each of the first BRP frames.

Specifically, the transmitting end is specifically configured with multiple sending antennas, and the transmitting end may send at least one first BRP frame to the receiving end through each transmitting antenna, specifically whether all transmitting antennas or partial transmitting antennas are used for transmission, which may be sent by the transmitting end. Decide. When the receiving end receives the at least one first BRP frame sent by the sending end, the receiving end parses each first BRP frame to obtain a TRN field in each first BRP frame. For a specific analysis manner, refer to the prior art. I will not repeat them here.

S403: The receiving end measures a channel impulse response between each antenna pair according to each TRN domain, and determines the time domain MIMO according to a measurement order of each TRN domain and a channel impulse response between each antenna pair. Channel matrix.

Specifically, after the TRN field in the first BRP frame is parsed, the receiving end can learn which one of the first BRP frames carrying the TRN field is sent according to the TRN field, and can also learn to receive the first BRP frame. Which receiving antenna is the one that knows the antenna pair corresponding to the TRN field. It should be noted that the receiving end measures the channel impulse response between the pair of antennas corresponding to the TRN domain according to the TRN domain, and therefore, the receiving end can be based on the measurement order of each TRN domain and between each antenna pair. The channel impulse response determines the order of channel impulse responses between each pair of antennas in the time domain MIMO channel matrix, thereby obtaining a time domain MIMO channel matrix.

S202: The receiving end encodes a path on each path in the time domain MIMO channel matrix by a byte, and obtains a bit array corresponding to each path according to the encoded path, and each path on the path. The last effective path corresponds to the byte number L on the bit array and the number P of effective paths on each of the paths.

Wherein each bit of the bit array corresponds to a path on the path.

Specifically, after obtaining the time domain MIMO channel matrix, the receiving end encodes the path on each path (one channel impulse response corresponding to one path) in the time domain MIMO channel matrix, that is, numbers are started from 1 Each of the 8 paths is one byte, and then the receiving end obtains a bit array corresponding to each path according to the encoded path, and the number of bits in the bit array is related to the number of bytes obtained by the encoded path. That is equal to the number of bytes obtained by the encoded path multiplied by 8. Assuming that a path includes 16 paths, the path corresponds to 2 bytes, and the corresponding bit array is an array of 16 bits, and each bit corresponds to a path in the path.

Further, the receiving end determines the effective path in each path, corresponding to the bit position corresponding to the effective path when the bit array is on, the bit position corresponding to the invalid path is 0, and the receiving end also obtains the last bit on each path. The effective path corresponds to the byte number L on the bit array and the total number P of effective paths on each path. For example, referring to the change of the bit array shown in FIG. 8, taking a path as an example, the receiving end obtains the bit array corresponding to the path according to the path encoded by the path, and may be a in FIG. 8, each bit ( That is, the small box in a) corresponds to a path on the path, after determining the effective path in the path at the receiving end, the bit position corresponding to the effective path in the bit array is set to 1, and the bit array is invalid. The bit position corresponding to the path is 0, and the first bit in the bit array is the path of the straight line propagation in the path, thus obtaining b in FIG. 8; as can be seen from b, the last effective path is located in the byte number 8 On the byte, the bit on the byte after byte number 8 is 0.

S203: The receiving end performs binary coding on each L corresponding to the path, and uses the coded L corresponding to each path as a delay indication field of each path.

Specifically, after the receiving end obtains the byte number L of the last effective path in each path in the bit array, the L is binary coded, and the encoded L is used as a delay indication field of each path. For example, if you continue to participate in the above example, L=8, the delay indication field corresponding to the path is 00001000.

S204: The receiving end deletes the bit located after the L in the bit array corresponding to each path according to the L corresponding to each path, obtains a new bit array, and uses the new bit array as each The effective path indication field of the path.

Specifically, after the receiving end obtains L in each path, it determines that the byte position where the last valid path is located is a byte whose byte number is L, that is, the path on the byte after the L is invalid. Therefore, in order to further save the feedback overhead, the receiving end deletes the bits located after L to obtain a new bit array, and then uses the new bit array as the effective path indication field of each path. For example, continue to refer to the above. In the example of Fig. 8, the resulting new bit array c is shown in Fig. 9, and the new bit array is the effective path indication field of the path.

S205: The receiving end obtains the effective path gain quantization information of each of the paths according to the number of effective paths P on each of the paths and the gain information quantized by each effective path on each of the paths. The effective path gain quantization information is used as an effective path gain indication field for each of the paths.

Specifically, the effective path gain of a path is a complex number, and the receiving end separately quantizes the real part and the imaginary part respectively. Optionally, the embodiment of the present application may select a uniform quantization scheme of equal length, and may also select other quantization schemes. Assume that the quantized bit width of the real and imaginary parts of the effective path gain is Nb bits, where Nb=1+m, 1 means that the corresponding channel gain is positive, 0 means that the corresponding channel gain is negative; m is the bit decimal place, according to the transmission The end digital domain precoding requires determining the fractional bit width; the quantization precision of the above quantization scheme can be used as the preset gain threshold.

Therefore, the receiving end obtains the total number P of effective paths on each path according to the above quantization precision, when quantifying When the bit is Nb, the quantized gain of the path is P×2×Nb, and the quantized gain is converted into a binary bit, and then the effective path gain quantization information of the path is used, and the effective path gain quantization information is obtained. As the effective path gain indication field of the path.

S206: The receiving end determines the time domain CSI encapsulation packet according to the delay indication field of each of the paths, the effective path indication field of each of the paths, and the effective path gain indication field of each of the paths, and The sending end sends the time domain CSI encapsulation packet.

Optionally, the receiving end obtains the time domain CSI encapsulation packet by using the delay indication field, the effective path indication field, and the effective path gain indication field of each path according to the foregoing S203, S204, and S205, and sends the time domain CSI encapsulation to the transmitting end. A package can specifically include two possible implementations:

The first possible implementation manner is as follows: Referring to FIG. 10, the receiving end determines and sends a time domain CSI encapsulation package, and the method includes:

S501: The receiving end encapsulates the delay indication field, the effective path indication field, and the effective path gain indication field of the same path into a time domain CSI encapsulation packet corresponding to the path.

S502: The receiving end sends the time domain CSI encapsulation packet corresponding to each path to the sending end according to the order of the channel impulse responses in the time domain MIMO channel matrix.

Specifically, in the possible implementation manner, the receiving end encapsulates the delay indication field, the effective path indication field, and the effective path gain indication field that belong to the same path into the time domain CSI encapsulation packet corresponding to the path, that is, A path corresponds to a CSI encapsulation packet. The structure of the time domain CSI encapsulation packet is that the delay indication field of the path is preceded, the effective path indication field is followed, and the effective path gain indication field is followed by the effective path indication field. See Figure 3 and Figure 4 above. Then, the receiving end sends the time domain CSI encapsulation packet corresponding to each path to the transmitting end according to the order of the channel impulse responses in the time domain MIMO channel matrix.

After the receiving end obtains the time domain MIMO channel matrix, the order of the channel impulse responses in the time domain MIMO channel matrix is sent to the transmitting end. Therefore, the transmitting end can know the time domain of the first sending end of the receiving end. The CSI encapsulation packet corresponds to the first channel impulse response in the time domain MIMO channel matrix, and the transmitting end can learn the first channel impulse response corresponding to the antenna pair according to the first time domain CSI encapsulation packet. The delay information of each path and the gain information of each path; similarly, the transmitting end can know the second channel impulse response in the time domain MIMO channel matrix corresponding to the second time domain CSI encapsulation sent by the receiving end, and further The transmitting end can obtain the delay information of each path between the pair of antennas corresponding to the second channel impulse response and the gain information of each path according to the second time domain CSI encapsulation packet; and so on, the transmitting end according to the The order of the time domain MIMO channel matrix and the time domain CSI encapsulation of the receiving end can obtain channel state information between the corresponding antenna pairs.

The second possible implementation manner is as follows: Referring to FIG. 11, the receiving end determines and sends a time domain CSI encapsulation package. The method includes:

S601: The receiving end encapsulates the delay indication field, the effective path indication field, and the effective path gain indication field corresponding to each path into a time domain CSI encapsulation sub-package.

S602: The receiving end encapsulates each time domain CSI encapsulation sub-packet into the time domain CSI encapsulation packet according to an arrangement order of each channel impulse response in the time domain MIMO channel matrix, and sends the packet to the sending end.

Specifically, the receiving end encapsulates the delay indication field, the effective path indication field, and the effective path gain indication field that belong to the same path into the time domain CSI encapsulation sub-packets corresponding to the path, that is, when one path corresponds to one time The domain CSI encapsulation sub-packet has a structure in which the delay indication field of the path is preceded, the effective path indication field is followed, and the effective path gain indication field is followed by the effective path indication field. See Figures 3 and 4 above. Then, the receiving end encapsulates each time domain CSI encapsulation sub-packet into a time domain CSI encapsulation packet according to the order of the channel impulse response in the time domain MIMO channel matrix, and sends the packet to the transmitting end, that is, according to the time domain MIMO channel matrix. The order of the impulse response of each channel is as follows: the time domain CSI encapsulation sub-packet of the path corresponding to the first channel impulse response in the time domain MIMO channel matrix is taken as the first one, and then the second channel is followed. The time domain CSI encapsulation sub-packet of the path corresponding to the impulse response is taken as the second one, and so on, and the complete time domain CSI encapsulation package is obtained. For example, it is assumed that, according to the order of the time domain MIMO channel matrix, the receiving end encapsulates the time domain CSI encapsulation sub-packet corresponding to h11, the time domain CSI encapsulation packet corresponding to h12, and the time domain CSI encapsulation sub-packet corresponding to h21. H22 corresponding to the time domain CSI encapsulation sub-package 4, wherein h11, h12, h21 and h22 are channel impulse responses in the time domain MIMO channel matrix, and h11 is the vector of the first row and the first column in the time domain MIMO matrix, H12 is the vector of the first row and the second column in the time domain MIMO matrix, h21 is the vector of the second row and the first column in the time domain MIMO matrix, and h22 is the vector of the second row and the second column of the time domain MIMO matrix, and then receiving The terminal encapsulates the time domain CSI encapsulation packet 1, the time domain CSI encapsulation packet 2, the time domain CSI encapsulation subpacket 3, and the time domain CSI encapsulation subpackage 4 into the order shown in FIG. 12 according to the above-mentioned order of h11, h12, h21, and h22. Domain CSI package.

After the receiving end obtains the time domain CSI encapsulation packet, it sends it to the transmitting end. After the receiving end obtains the time domain MIMO channel matrix, the order of the channel impulse responses in the time domain MIMO channel matrix is sent to the transmitting end. Therefore, the transmitting end can learn the time domain CSI encapsulation packet sent by the receiving end. The first time domain CSI encapsulation sub-packet corresponds to the first channel impulse response in the time domain MIMO channel matrix, and the first channel rush that the transmitting end can learn according to the first time domain CSI encapsulation sub-packet The delay information of each path between the antenna pairs corresponding to the excitation response and the gain information of each path; similarly, the transmitting end can know the second time domain CSI encapsulation sub-package in the time domain CSI encapsulation packet sent by the receiving end Corresponding to the second channel impulse response in the time domain MIMO channel matrix, and then the transmitting end can learn the second channel impulse response corresponding to the antenna pair according to the second time domain CSI encapsulation sub-package The delay information of the path and the gain information of each path; and so on, the transmitting end can obtain the channel between the corresponding antenna pair according to the order of the time domain MIMO channel matrix and the received time domain CSI encapsulation packet. State information.

Regardless of the form in which the receiving end sends the time domain CSI encapsulation packet to the transmitting end, optionally, the receiving end may directly transmit the time domain CSI encapsulation packet, and may also perform coding and modulation processing on the time domain CSI encapsulation packet. The modulated CSI encapsulation packet is obtained, and the modulated CSI encapsulation packet is carried in the second BRP frame and sent to the transmitting end. Optionally, the receiving end may select an error correction coding scheme suitable for the specific application, such as a Low Density Parity Check Code (LDPC); optionally, encode the time domain CSI. In the modulation mode, the modulation mode may adopt a low-order and high-order modulation scheme, and use a low-order scheme to ensure the validity when the feedback channel is unreliable, and use a high-order scheme to improve the feedback efficiency when the feedback channel is reliable, but the embodiment of the present application Not limited to this. Optionally, considering the compatibility of the system, the modulated CSI encapsulation packet may be added to the BRP feedback frame (BRP with feedback) of the second BRP frame to obtain an Ex-BRP-FB, as shown in FIG. A frame structure diagram, the Ex-BRP-FB is a second BRP frame carrying a modulated CSI encapsulation packet.

Optionally, when the receiving end carries the modulated CSI encapsulation packet in the second BRP frame and sends the CSI encapsulation packet to the sending end, the first BRP frame may carry the first indication information and the second indication information, optionally, the First indication and The second indication information may be carried in the DMG Beam Refinement element in the second BRP frame, where the first indication information is used to indicate to the sending end that the modulated CSI encapsulation packet is carried in the second BRP frame, and the second indication information is used by the second indication information. And indicating, by the sending end, the number of valid paths on each path, after receiving the second BRP frame, the sending end may parse the time domain CSI encapsulation packet according to the first indication information and the second indication information, to obtain the sending end and Delay information and gain information for each path between the receiving ends.

Optionally, before the foregoing S102, or before S201, the method may further include the following steps:

S701: The receiving end receives the third indication information sent by the sending end, where the third indication information is used to indicate the number of sending antennas to the receiving end.

S702: The receiving end determines whether to perform time domain CSI feedback according to the number of the transmitting antennas and the number of receiving antennas.

Specifically, the receiving end receives the third indication information sent by the sending end, and the third indication information is used to indicate to the receiving end the number of transmitting antennas on the transmitting end, where the receiving end obtains the CSI between the pair of antennas. Optionally, the third indication information may be carried in the first BRP frame. When the receiving end obtains the number of transmitting antennas on the transmitting end, the receiving end determines whether the current domain CSI feedback is needed according to the number of transmitting antennas and the number of receiving antennas and the preset transmitting antenna threshold and the receiving antenna threshold. When the number of transmitting antennas is smaller than a preset transmit antenna threshold, or the number of receiving antennas is smaller than a preset threshold of the receiving antenna, it is determined that time domain CSI feedback is not currently required, and the preset transmitting antenna threshold and receiving are performed. The threshold of the antenna is an integer greater than or equal to 1. The specific threshold setting may be determined according to the actual application of the system. For example, if the third indication information indicates a 1x1 transceiver antenna, the receiving end does not need to perform time domain CSI. Feedback. The foregoing determines whether the receiving end needs to perform time domain CSI feedback according to the number of transmitting antennas and the number of receiving antennas, which can prevent the receiving end from blindly determining the time domain CSI encapsulation packet, thereby greatly reducing the processing overhead of the receiving end.

In the feedback method of the channel state information provided by the embodiment of the present application, the receiving end determines the time domain MIMO channel matrix according to the time domain CSI between the antenna pairs, and presses the path on each path in the time domain MIMO channel matrix. The byte is encoded, and the bit array corresponding to each path is obtained according to the encoded path, and the last effective path on each path corresponds to the byte number L on the bit array and the number P of effective paths on each path; Then, the receiving end performs binary coding on the L corresponding to each path, and uses the coded L corresponding to each path as the delay indication field of each path; and deletes each path according to the L corresponding to each path. a bit in the corresponding bit array located after L, to obtain a new bit array, and the effective path indication field of each path of the new bit array; and, the receiving end according to the number of effective paths P and each path The gain information quantized by each effective path on each path obtains the effective path gain quantization information of each of the paths, and the effective path gain quantization information is used as effective for each path. a gain indication field, so that the time domain CSI encapsulation packet is determined and sent to the transmitting end according to the delay indication field of each path, the effective path indication field of each path, and the effective path gain indication field of each path, by using the method The obtained time domain CSI encapsulation packet can represent the location of the field where each effective path between each pair of antennas is located to the transmitting end, so that the transmitting end can obtain the effective path between the pair of antennas according to the position of the field where each effective path is located. Delay information, which does not require the receiving end to quantize the delay information of all effective paths between each antenna pair, and then feeds back to the transmitting end, which greatly saves the delay feedback overhead of the receiving end; on the other hand, after deleting L The bit characterizing the invalid path reduces the length of the effective path indication field, which reduces the size of the time domain CSI encapsulation packet, further reduces the time domain feedback overhead of the receiving end; further, when the number of paths between one antenna pair is greater than 63 When the delay indication field and the valid path indication field correspond to one byte, The setting of the path can be used to send more lengths of the field to the sender, so that the sender can obtain the delay information on all the effective paths between the pair of antennas. Therefore, the embodiment of the present application can be free from 802.11ad. The limitation of one antenna pair supporting up to 63 channel taps greatly improves the feedback efficiency and feedback flexibility of the receiving end.

To further illustrate the system overhead in the implementation of the time domain CSI feedback in the embodiment of the present application, the following is an analysis of various system feedback costs of the 802.11 series involved in the solution:

1. Feedback overhead for CSI of IEEE802.11n/ac system

(1) IEEE 802.11n system: Assuming that the number of subcarriers in the system is M, the number of transmitting antennas is N _t , the number of receiving antennas is N _r , and the quantization bit width is N _b , the overhead of the system after quantization is : M × 2 × N _b × N _t × N _r ; where 2 × N _b is the gain of one subcarrier, and M × 2 × N _b is the gain of M subcarriers, which is feedback between a pair of antenna pairs The overhead is then multiplied by Nt and Nr based on M×2×N _b to obtain the gain on the subcarriers between all pairs of antennas, that is, the CSI feedback overhead of the IEEE 802.11n system.

(2) IEEE802.11ac system: Assume that the number of subcarriers in the system is M, the number of transmitting antennas is N _t , the number of receiving antennas is N _r , and the quantization bit width is N _b , then the overhead of the system after quantization is also It is: M × 2 × N _b × N _t × N _r .

2. Feedback overhead for CSI of IEEE802.11ad system

Taking the indoor scene as an example, if the delay quantization bit is 8 (that is, the delay feedback overhead on one path), the total feedback overhead of the system is: (8×P+2×N _b ×P)×N _t ×N _r ; where P is the number of paths in a path, the maximum value is 63, N _b is the quantization bit width, N _t is the number of transmitting beams, N _r is the number of receiving beams, and 8 × P is a path Delay feedback overhead, 2 × N _b × P is the gain feedback overhead of one path, (8 × P + 2 × N _b × P) × N _t × N _r to obtain the overall overhead on all paths. When the system performs CSI feedback, the feedback information is incomplete, which is limited by the number of channel taps.

3. The feedback overhead of the method in the embodiment of the present application is adopted for the IEEE 802.11ay system.

Suppose the number of transmitting antennas is N _t , the number of receiving antennas is N _r , and the quantization bit width is N _b . P is the number of effective paths in a path, l=L×8, where L is the last effective path on a path. The byte number of the scheme is: (8 + l + 2 × N _b × P) × N _t × N _r . 8 is the length of the delay indication field of the CSI encapsulation packet, l is the length of the effective path indication field, and 2×N _b ×P is the gain overhead of all valid paths on one path, that is, the length of the effective path gain indication field. The three are added as feedback overhead on one path, and finally (8+l+2×N _b ×P)×N _t ×N _r obtains the feedback overhead on all paths in the system.

Alternatively, the subsequent cost comparison can be performed in a practical situation of the 60 GHz conference room channel model. In this model, the number of effective paths in each path is 12, and the last effective path is in the byte number 10. The following methods are used to calculate the respective CSI feedback overheads from the single-input single-output SISO channel scenario, the 2×2 MIMO channel scenario, and the 4×4 MIMO channel scenario.

1. SISO channel scenario: including one transmitting antenna and one receiving antenna, Nt and Nr are both 1, the number of subcarriers M is 512, the number of effective channels of single channel is P=12, the number of channel taps is 128, L=10, specific The cost comparison of the three systems can be seen in Table 1:

Table 1

It can be seen from Table 1 that the embodiment of the present application greatly reduces the CSI feedback overhead.

2, 2 × 2 MIMO channel scenario: including 2 transmit antennas and 2 receive antennas, Nt and Nr are 2, the number of subcarriers M is 512, the number of effective channels of a single channel is P = 12, and the number of channel taps is 128, L =10, the cost comparison of the specific three systems can be seen in Table 2:

Table 2

As can be seen from Table 2, the embodiment of the present application greatly reduces the CSI feedback overhead.

3, 4 × 4 MIMO channel scenario: including 4 transmit antennas and 4 receive antennas, Nt and Nr are 4, The number of subcarriers M is 512, the number of effective channels of a single channel is P=12, and the number of channel taps is 128, L=10. The cost comparison of the specific three systems can be seen in Table 3:

table 3

As can be seen from Table 3, the embodiment of the present application greatly reduces the CSI feedback overhead.

Therefore, it can be seen from the above examples that the method in the embodiment of the present application can greatly reduce the feedback overhead of the CSI, and is not limited by the number of channel taps.

Optionally, all or part of the steps of implementing the foregoing method embodiments may be performed by using hardware related to the program instructions. The foregoing program may be stored in a computer readable storage medium, and when executed, the method includes performing the foregoing method. The foregoing storage medium includes the following various media that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

FIG. 14 is a schematic structural diagram of Embodiment 1 of a device for feeding back channel state information according to an embodiment of the present disclosure. The feedback device can be a stand-alone communication device, and can also be a device integrated in the communication device, and the device can be implemented by software, hardware or a combination of software and hardware. As shown in FIG. 14, the feedback device includes:

The obtaining module 10 is configured to acquire time domain channel state information CSI between each pair of antennas;

The sending module 11 is configured to send a time domain CSI encapsulation packet to the transmitting end according to the time domain CSI between the antenna pairs, where the time domain CSI encapsulation packet is used to indicate each antenna pair to the sending end The position of each field between each effective path and the effective path gain information of the corresponding path of each antenna pair; the field position of the effective path is used to indicate the position of the field and the pre-position according to the effective path The unit delay is determined to determine delay information of the effective path; and the effective path is a path in the path where the gain is greater than a preset gain threshold.

Optionally, the obtaining module 10 may be a processor in the receiving device, the sending module 11 may be a transmitter in the receiving device, or the sending module 11 may further integrate some functions of the processor.

The feedback device of the channel state information provided by the embodiment of the present application may perform the foregoing method embodiments, and the implementation principle and technical effects are similar, and details are not described herein again.

Optionally, the time domain CSI encapsulation packet includes a delay indication field, a valid path indication field, and an effective path gain indication field.

The delay indication field is used to indicate that a last effective path between any pair of antennas corresponds to a byte number on the effective path indication field; each byte in the effective path indication field corresponds to 8 paths The effective path indication field is configured to indicate, to the sending end, a field location where each valid path between the pair of antennas is located, so that the sending end is according to a field position where the effective path is located and the unit The time delay acquires the delay information of the effective path; the effective path gain indication field is used to indicate to the transmitting end, the effective path gain quantization information of the path corresponding to each antenna pair.

Optionally, the delay indication field is an 8-bit indication field, and the delay indication field is further used to represent a length of the effective path indication field.

FIG. 15 is a schematic structural diagram of Embodiment 2 of a device for feeding back channel state information according to an embodiment of the present disclosure. On the basis of the foregoing embodiment, the sending module 11 further includes:

The first determining unit 111 is configured to determine a time domain multiple input multiple output MIMO channel matrix according to the time domain CSI between the antenna pairs, where the time domain MIMO channel matrix includes a channel impulse response of at least one path. a path including at least one path;

a first coding unit 112, configured to encode a path on each path in the time domain MIMO channel matrix by a byte, and obtain a bit array corresponding to each path according to the encoded path, and each bit The last effective path on the path corresponds to the byte number L on the bit array and the number P of effective paths on each of the paths; wherein each bit of the bit array corresponds to a path on the path ;

a second coding unit 113, configured to perform binary coding on each L corresponding to the path, and use the coded L corresponding to each path as a delay indication field of each path;

a deleting unit 114, configured to delete a bit located after the L in each bit array corresponding to each path according to L corresponding to each path, to obtain a new bit array, and the new bit array As an effective path indication field for each of the paths;

The quantization unit 115 is configured to obtain the effective path gain quantization information of each of the paths according to the number of effective paths P on each path and the gain information quantized by each effective path on each of the paths. And using the effective path gain quantization information as an effective path gain indication field of each of the paths;

The second determining unit 116 is configured to determine the time domain CSI encapsulation according to a delay indication field of each of the paths, an effective path indication field of each of the paths, and an effective path gain indication field of each of the paths. package;

The sending unit 117 is configured to send the time domain CSI encapsulation packet to the sending end.

Optionally, the first determining unit 111 is specifically configured to separately number the transmitting antenna and the receiving antenna, and obtain each sending in sequence according to the number of the transmitting antenna and the number of the receiving antenna. A channel impulse response between the antenna and each pair of antennas formed by each of the receiving antennas, and then acquiring the time domain MIMO channel matrix according to a channel impulse response between each pair of antennas.

Optionally, the foregoing first determining unit 111 is configured to receive at least one first beam optimization protocol BRP frame sent by the sending end, and obtain a TRN field in each of the first BRP frames; and, according to each The TRN domain measures the channel impulse response between each antenna pair and determines the time domain MIMO channel matrix based on the measurement order of each TRN domain and the channel impulse response between each antenna pair.

Optionally, the sending unit 117 is further configured to buffer each channel in the time domain MIMO channel matrix. The sort order should be sent to the sender.

Optionally, the second determining unit 116 is configured to encapsulate the delay indication field, the effective path indication field, and the effective path gain indication field of the same path into a time domain CSI encapsulation packet corresponding to the path; The unit 117 is specifically configured to send a time domain CSI encapsulation packet corresponding to each path to the sending end according to an arrangement order of each channel impulse response in the time domain MIMO channel matrix.

Optionally, the second determining unit 116 is configured to encapsulate the delay indication field, the effective path indication field, and the effective path gain indication field corresponding to each path into a time domain CSI encapsulation sub-package, and according to the foregoing The order of arrangement of the channel impulse responses in the domain MIMO channel matrix encapsulates each time domain CSI encapsulation sub-packet into the time domain CSI encapsulation packet, and then is sent to the transmitting end by the sending unit 117.

Optionally, the foregoing second determining unit 116 is further configured to perform coding and modulation processing on the time domain CSI encapsulation packet to obtain a modulated CSI encapsulation packet, where the sending unit 117 is specifically configured to use the modulated The CSI encapsulation packet is carried in the second BRP frame and sent to the transmitting end. The second BRP frame carries the first indication information and the second indication information, where the first indication information is used to indicate to the sending end that the second CRP frame carries the modulated CSI encapsulation packet, The second indication information is used to indicate to the sending end the number of valid paths on each path.

Continuing to refer to FIG. 15 above, optionally, the feedback device may further include a receiving module 12 and a determining module 13;

The receiving module 12 is configured to receive third indication information that is sent by the sending end, where the third indication information is used to indicate the number of sending antennas to the receiving end;

The determining module 13 is configured to determine whether to perform time domain CSI feedback according to the number of the transmitting antennas and the number of receiving antennas.

FIG. 16 is a schematic structural diagram of an embodiment of a communication device according to an embodiment of the present disclosure. As shown in FIG. 16, the communication device can include a transmitter 20, a processor 21, a memory 22, and at least one communication bus 23. The communication bus 23 is used to implement a communication connection between components. The memory 22 may include a high speed RAM memory 22, and may also include a non-volatile memory NVM, such as at least one disk memory 22, in which various programs may be stored for performing various processing functions and implementing the method of the present embodiment. step. Optionally, the communication device may further include a receiver 24. The receiver 24 in this embodiment may be a corresponding input interface having a communication function and a function for receiving information, and may also be a radio frequency module or a baseband module on the communication device. The transmitter 20 in this embodiment may be a corresponding output interface having a communication function and a function of transmitting information, and may also be a radio frequency module or a baseband module on the communication device. Optionally, the transmitter 20 and the receiver 24 may be integrated in one communication interface, or may be two independent communication interfaces.

In this embodiment, the processor 21 is configured to acquire time domain channel state information CSI between each pair of antennas;

The transmitter 20 is configured to send, according to the time domain CSI between the antenna pairs, a time domain CSI encapsulation packet to the transmitting end, where the time domain CSI encapsulation packet is used to indicate each antenna pair to the sending end. The position of each field between each effective path and the effective path gain information of the corresponding path of each antenna pair; the field position of the effective path is used to indicate the position of the field and the pre-position according to the effective path The unit delay is determined to determine delay information of the effective path; and the effective path is a path in the path where the gain is greater than a preset gain threshold.

Optionally, the processor 21 is further configured to determine a time domain multiple input multiple output MIMO channel matrix according to time domain CSI between the antenna pairs, and each of the time domain MIMO channel matrices The path on the path is encoded in bytes, and the bit array corresponding to each path is obtained according to the encoded path, and the last valid path on each path corresponds to the byte number L on the bit array, and each a number P of valid paths on the path; and binary coding of each L corresponding to the path, and using the coded L corresponding to each path as a delay indication of each path a field, and, according to the L corresponding to each of the paths, deleting bits located after the L in the bit array corresponding to each of the paths, obtaining a new bit array, and using the new bit array as each An effective path indication field of the path; and obtaining, according to the number of effective paths P on each of the paths and the gain information quantized by each effective path on each of the paths, obtaining the path of each of the paths Effective path gain quantization information, Using the effective path gain quantization information as an effective path gain indication field of each of the paths; and, according to a delay indication field of each of the paths, an effective path indication field of each of the paths, and each of the paths An effective path gain indication field of the path, determining the time domain CSI encapsulation packet, and sending the time domain CSI encapsulation packet to the sending end by using the transmitter 20;

Optionally, the processor 21 determines, according to the time domain CSI between the antenna pairs, the time domain MIMO channel matrix, specifically:

The processor 21 is specifically configured to respectively number the transmitting antenna and the receiving antenna, and obtain each transmitting antenna and each receiving in sequence according to the number of the transmitting antenna and the number of the receiving antenna. The channel impulse response between the antenna pairs formed by the antennas, and the time domain MIMO channel matrix is obtained according to the channel impulse response between each antenna pair.

Optionally, the receiver 24 is configured to receive at least one first beam optimization protocol BRP frame sent by the sending end, where the processor 21 is configured to obtain a TRN in each of the first BRP frames. a domain, and measuring a channel impulse response between each antenna pair according to each TRN domain, and determining the time domain MIMO channel according to a measurement order of each TRN domain and a channel impulse response between each antenna pair matrix.

Optionally, the transmitter 20 is further configured to: after determining, by the processor 21, the time domain MIMO channel matrix according to the time domain CSI between the antenna pairs, each of the time domain MIMO channel matrices The order of the channel impulse responses is sent to the transmitting end.

Optionally, the processor 21 is specifically configured to: use a delay indication field and an effective path indicator of the same path. The segment and the effective path gain indication field are encapsulated into the time domain CSI encapsulation packet corresponding to the path; the transmitter 20 is specifically configured to respectively perform the order of the impulse response of each channel in the time domain MIMO channel matrix. A time domain CSI encapsulation packet corresponding to each path is sent to the sending end.

Optionally, the processor 21 is configured to encapsulate the delay indication field, the effective path indication field, and the effective path gain indication field corresponding to each path into a time domain CSI encapsulation sub-package according to the time domain. The order of arrangement of the channel impulse responses in the MIMO channel matrix encapsulates each time domain CSI encapsulation sub-packet into the time domain CSI encapsulation packet, and then sends the same to the transmitting end through the transmitter 20.

Optionally, the processor 21 is further configured to perform coding and modulation processing on the time domain CSI encapsulation packet to obtain a modulated CSI encapsulation packet, where the transmitter 20 is specifically configured to use the modulated The CSI encapsulation packet is carried in the second BRP frame and sent to the sending end; the second BRP frame carries the first indication information and the second indication information, where the first indication information is used to indicate to the sending end The second BRP frame carries the modulated CSI encapsulation packet, and the second indication information is used to indicate to the sending end the number of valid paths on each path.

Optionally, the receiver 24 is further configured to: before the sending, by the transmitter 20, send a time domain CSI encapsulation packet to the sending end according to the time domain CSI between the antenna pairs, The third indication information, the third indication information is used to indicate the number of transmitting antennas to the receiving end; and the processor 21 is further configured to use the number of the transmitting antennas and the number of receiving antennas. , to determine whether to perform time domain CSI feedback.

The communication device provided by the embodiment of the present application may perform the foregoing method embodiments, and the implementation principles and technical effects thereof are similar, and details are not described herein again.

Claims

A method for feeding back channel state information, comprising:

The receiving end acquires time domain channel state information CSI between each pair of antennas;

The receiving end sends a time domain CSI encapsulation packet to the transmitting end according to the time domain CSI between the antenna pairs, where the time domain CSI encapsulation packet is used to indicate to the transmitting end that each pair of antennas is The position of the field where the effective path is located, and the effective path gain information of the path corresponding to each antenna pair; the field position where the effective path is located is used to indicate that the sending end is based on the field position of the effective path and the preset The unit delay determines the delay information of the effective path; the effective path is a path in the path where the gain is greater than a preset gain threshold.
The method according to claim 1, wherein the time domain CSI encapsulation packet includes a delay indication field, an effective path indication field, and an effective path gain indication field;

The delay indication field is used to indicate that a last effective path between any pair of antennas corresponds to a byte number on the effective path indication field;

Each byte in the valid path indication field corresponds to 8 paths, and the effective path indication field is used to indicate to the sending end a field position where each valid path between the pair of antennas is located, so that The sending end acquires the delay information of the effective path according to the field position where the effective path is located and the unit delay;

The effective path gain indication field is used to indicate to the transmitting end, effective path gain quantization information of a path corresponding to each antenna pair.
The method according to claim 2, wherein the delay indication field is an 8-bit indication field.
The method according to claim 3, wherein the delay indication field is further used to represent the length of the effective path indication field.
The method according to claim 4, wherein the receiving end sends the time domain CSI encapsulation packet to the transmitting end according to the time domain CSI between the antenna pairs, and specifically includes:

The receiving end determines a time domain multiple input multiple output MIMO channel matrix according to the time domain CSI between the antenna pairs, wherein the time domain MIMO channel matrix includes a channel impulse response of at least one path, and one path includes At least one path;

The receiving end encodes a path on each path in the time domain MIMO channel matrix by a byte, and obtains a bit array corresponding to each path according to the encoded path, and each path on the path The last effective path corresponds to the byte number L on the bit array and the number P of effective paths on each of the paths; wherein each bit of the bit array corresponds to a path on the path;

The receiving end performs binary coding on each L corresponding to the path, and uses the coded L corresponding to each path as a delay indication field of each of the paths;

The receiving end deletes the bit located after the L in the bit array corresponding to each path according to the L corresponding to each path, obtains a new bit array, and uses the new bit array as each An effective path indication field of the path;

The receiving end obtains the effective path gain quantization information of each of the paths according to the number of effective paths P on each of the paths and the gain information quantized by each effective path on each of the paths, and The effective path gain quantization information is used as an effective path gain indication field of each of the paths;

The receiving end according to the delay indication field of each of the paths, and the effective path indication field of each of the paths And determining, by the effective path gain indication field of each of the paths, the time domain CSI encapsulation packet, and sending the time domain CSI encapsulation packet to the sending end.
The method according to claim 5, wherein the receiving end determines the time domain MIMO channel matrix according to the time domain CSI between the antenna pairs, and specifically includes:

The receiving end respectively numbers the transmitting antenna and the receiving antenna;

The receiving end obtains, according to the number of the transmitting antenna and the number of the receiving antenna, a channel impulse response between antenna pairs formed by each transmitting antenna and each receiving antenna in sequence;

The receiving end acquires the time domain MIMO channel matrix according to a channel impulse response between each antenna pair.
The method according to claim 5, wherein the receiving end determines the time domain MIMO channel matrix according to the time domain CSI between the antenna pairs, and specifically includes:

Receiving, by the receiving end, at least one first beam optimization protocol BRP frame sent by the sending end;

Receiving, by the receiving end, a training TRN field in each of the first BRP frames;

The receiving end measures a channel impulse response between each antenna pair according to each TRN domain, and determines the time domain MIMO according to a measurement order of each TRN domain and a channel impulse response between each antenna pair. Channel matrix.
The method according to any one of claims 5-7, wherein the receiving end determines the time domain MIMO channel matrix according to the time domain CSI between the antenna pairs, and further includes:

The receiving end sends an order of arrangement of each channel impulse response in the time domain MIMO channel matrix to the transmitting end.
The method according to claim 8, wherein the delay indication field according to each of the paths, the effective path indication field of each of the paths, and the effective path gain indication field of each of the paths, Determining the time domain CSI encapsulation packet, and sending the time domain CSI encapsulation package to the sending end, specifically:

The receiving end encapsulates the delay indication field, the effective path indication field, and the effective path gain indication field of the same path into a time domain CSI encapsulation packet corresponding to the path;

The receiving end sends the time domain CSI encapsulation packet corresponding to each path to the sending end according to the order of the channel impulse responses in the time domain MIMO channel matrix.
The method according to claim 8, wherein the delay indication field according to each of the paths, the effective path indication field of each of the paths, and the effective path gain indication field of each of the paths, Determining the time domain CSI encapsulation packet, and sending the time domain CSI encapsulation package to the sending end, specifically:

The receiving end encapsulates the delay indication field, the effective path indication field, and the effective path gain indication field corresponding to each path into a time domain CSI encapsulation sub-package;

The receiving end encapsulates each time domain CSI encapsulation sub-packet into the time domain CSI encapsulation packet according to the order of arrangement of the channel impulse responses in the time domain MIMO channel matrix, and sends the packet to the sending end.
The method according to claim 5, wherein the sending the time domain CSI encapsulation package to the sending end comprises:

The receiving end performs coding and modulation processing on the time domain CSI encapsulation packet to obtain a modulated CSI encapsulation packet;

The receiving end carries the modulated CSI encapsulation packet in a second BRP frame and sends the packet to the sending end.
The method according to claim 11, wherein the second BRP frame carries first indication information and second indication information, where the first indication information is used to indicate the second BRP to the sending end. In the frame And carrying the modulated CSI encapsulation packet, where the second indication information is used to indicate to the sending end the number of valid paths on each path.
The method according to any one of claims 1 to 12, wherein the receiving end sends the time domain CSI encapsulation packet to the transmitting end according to the time domain CSI between the antenna pairs. The method also includes:

The receiving end receives the third indication information sent by the sending end, where the third indication information is used to indicate the number of transmitting antennas to the receiving end;

The receiving end determines whether to perform time domain CSI feedback according to the number of the transmitting antennas and the number of receiving antennas.
A communication device, comprising:

a processor, configured to acquire time domain channel state information CSI between each pair of antennas;

a transmitter, configured to send a time domain CSI encapsulation packet to the transmitting end according to the time domain CSI between the antenna pairs, where the time domain CSI encapsulation packet is used to indicate to the transmitting end between each antenna pair The field position of each effective path and the effective path gain information of the corresponding path of each antenna pair; the field position of the effective path is used to indicate that the sending end is based on the field position and preset of the effective path The unit delay determines the delay information of the effective path; the effective path is a path in the path where the gain is greater than a preset gain threshold.
The communication device according to claim 14, wherein the time domain CSI encapsulation packet includes a delay indication field, an effective path indication field, and an effective path gain indication field;

The delay indication field is used to indicate that a last effective path between any pair of antennas corresponds to a byte number on the effective path indication field;

Each byte in the valid path indication field corresponds to 8 paths, and the effective path indication field is used to indicate to the sending end a field position where each valid path between the pair of antennas is located, so that The sending end acquires the delay information of the effective path according to the field position where the effective path is located and the unit delay;

The effective path gain indication field is used to indicate to the transmitting end, effective path gain quantization information of a path corresponding to each antenna pair.
The communication device according to claim 15, wherein the delay indication field is an 8-bit indication field.
The communication device according to claim 16, wherein the delay indication field is further used to characterize a length of the effective path indication field.
The communication device according to claim 17, wherein the processor is further configured to determine a time domain multiple input multiple output MIMO channel matrix according to time domain CSI between the antenna pairs, and The path on each path in the time domain MIMO channel matrix is encoded in bytes, and the bit array corresponding to each path is obtained according to the encoded path, and the last effective path on each of the paths corresponds to the bit. a byte number L on the array, a number P of effective paths on each of the paths; and binary encoding each L corresponding to the path, and using the encoded L corresponding to each of the paths as a delay indicator field of each of the paths, and deleting, according to L corresponding to each of the paths, a bit located after the L in a bit array corresponding to each path, to obtain a new bit array, and Using the new bit array as an effective path indication field for each of the paths; and, according to the number of effective paths P on each of the paths and the quantized gain of each effective path on each of the paths Information, get every The effective diameter of the path gain quantization information, and the effective diameter of the gain quantization information as the effective radius of each path gain indication field; and, in accordance with each of said path a time delay indication field, a valid path indication field of each of the paths, and an effective path gain indication field of each of the paths, determining the time domain CSI encapsulation packet, and transmitting, by using the transmitter, the sending end Describe the time domain CSI package;

The time domain MIMO channel matrix includes a channel impulse response of at least one path, and one path includes at least one path; each bit of the bit array corresponds to a path on the path.
The communication device according to claim 18, wherein the processor determines the time domain MIMO channel matrix according to the time domain CSI between the antenna pairs, and specifically includes:

The processor is specifically configured to respectively number the transmitting antenna and the receiving antenna, and obtain each transmitting antenna and each receiving antenna in sequence according to the number of the transmitting antenna and the number of the receiving antenna. A channel impulse response between the pair of antennas is constructed, and the time domain MIMO channel matrix is obtained based on a channel impulse response between each pair of antennas.
The communication device according to claim 18, wherein said communication device further comprises a receiver;

The receiver is configured to receive at least one first beam optimization protocol BRP frame sent by the sending end;

The processor is specifically configured to acquire a training TRN field in each of the first BRP frames, and measure a channel impulse response between each antenna pair according to each TRN domain, and measure according to each TRN domain. The time domain MIMO channel matrix is determined by a sequence and a channel impulse response between each antenna pair.
The communication device according to any one of claims 18 to 20, wherein the transmitter is further configured to determine, in the processor, a time domain MIMO channel according to a time domain CSI between the antenna pairs. After the matrix, the order of arrangement of the channel impulse responses in the time domain MIMO channel matrix is sent to the transmitting end.
The communication device according to claim 21, wherein the processor is configured to encapsulate a delay indication field, an effective path indication field, and an effective path gain indication field of the same path as the path corresponding to the path. Domain CSI package;

The transmitter is specifically configured to send a time domain CSI encapsulation packet corresponding to each path to the sending end according to an arrangement order of each channel impulse response in the time domain MIMO channel matrix.
The communication device according to claim 21, wherein the processor is configured to encapsulate the delay indication field, the effective path indication field, and the effective path gain indication field corresponding to each path into a time domain CSI encapsulation. a sub-packet, and encapsulating each time-domain CSI encapsulation sub-packet into the time-domain CSI encapsulation packet according to an arrangement order of each channel impulse response in the time-domain MIMO channel matrix, and then sending the The sender.
The communication device according to claim 18, wherein the processor is further configured to perform coding and modulation processing on the time domain CSI encapsulation packet to obtain a modulated CSI encapsulation packet;

The transmitter is specifically configured to carry the modulated CSI encapsulation packet in a second BRP frame and send the packet to the sending end.
The communication device according to claim 24, wherein the second BRP frame carries first indication information and second indication information, and the first indication information is used to indicate the second to the sending end. The modulated CSI encapsulation packet is carried in the BRP frame, and the second indication information is used to indicate to the sending end the number of valid paths on each path.
A communication device according to any one of claims 14-25, wherein said receiver is further And receiving, by the sender, third indication information sent by the sending end, the third indication, before sending, by the sender, the time domain CSI encapsulation packet to the sending end according to the time domain CSI between the antenna pairs. The information is used to indicate to the receiving end the number of transmitting antennas;

The processor is further configured to determine whether to perform time domain CSI feedback according to the number of the transmitting antennas and the number of receiving antennas.