CN105684336A - Channel measurement method and device - Google Patents

Abstract

Provided in an embodiment of the present invention are a channel measurement method and device, and receiving node, comprising: an acquisition module for acquiring a number N of codebooks in a codebook group to be measured, N>=1; a measurement module for measuring a channel to obtain a codebook group of the channel, the codebook group comprising N codebooks; and a transmission module for reporting the information of the codebook group to a transmission node. The channel measurement method and device in the embodiment of the present invention improves a precision of channel measurement and feedback.

Description

Channel measurement method and device Technical Field

The embodiment of the invention relates to the technical field of wireless communication, in particular to a channel measurement method and a channel measurement device.

Background

The spectrum is the most important resource in wireless communication, and currently mainstream wireless communication systems, such as Global System for Mobile communication (GSM) System, Code Division Multiple Access (CDMA) 2000/Wideband Code Division Multiple Access (WCDMA) System, Long Term Evolution (LTE) System, etc., generally operate on carrier frequencies below 3 GHz.

With the development of intelligent terminals, especially the appearance of video services on the intelligent terminals, it is difficult for currently used spectrum resources to meet the explosive increase of capacity requirements of users. Therefore, a high frequency band (e.g., 3GHz to 200GHz) having a larger available bandwidth is increasingly becoming a candidate frequency band for the next generation wireless communication system. However, unlike the frequency band used in the existing wireless communication system, the high frequency band will cause larger path loss, and especially, factors such as atmosphere and vegetation will cause larger loss to the wireless propagation of the high frequency band. Since the high frequency band generates higher path loss, it is necessary to increase the gain of the antenna by reducing the beam width.

However, for narrower beams, a smaller angle deviation will bring larger antenna gain difference, so when the narrower beams are applied to cellular communication, the accuracy of beam tracking (mainly Beamforming (BF)) becomes especially important, otherwise the accuracy and reliability of data transmission will be affected.

The transmitting terminal precodes data according to a codebook fed back after the receiving terminal measures the channel, and then transmits the precoded data through an antenna, so that how to improve the precision of the channel measurement and feedback of the receiving terminal directly influences the accuracy and reliability of data transmission.

Disclosure of Invention

The embodiment of the invention provides a channel measuring method and device, which improve the accuracy of measuring and feeding back a channel.

A first aspect provides a receiving node comprising:

the acquisition module is used for acquiring the number N of the codebooks in the codebook group to be measured, wherein N is more than or equal to 1;

the measuring module is used for measuring a channel to obtain a codebook group of the channel, wherein the codebook group comprises N codebooks;

and the sending module is used for reporting the information of the codebook group to a transmitting node.

With reference to the first aspect, in a first possible implementation manner of the first aspect, the obtaining module is further configured to, after obtaining the number N of codebooks in the codebook group to be measured, generate, by using M codebooks in a codebook space of the receiving node, a codebook group space composed of at least two codebook groups, where each codebook group in the codebook group space is composed of N codebooks.

With reference to the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, a part of codebooks in at least two codebook groups in the codebook group space are the same.

With reference to the first or second possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect, the sending module is specifically configured to report, to the transmitting node, an index number of the codebook group in the codebook group space.

With reference to any one possible implementation manner of the first aspect to the third possible implementation manner of the first aspect, in a fourth possible implementation manner of the first aspect, the obtaining module is specifically configured to receive a high layer signaling or a physical layer dedicated signaling sent by the transmitting node, where the high layer signaling or the physical layer dedicated signaling includes the N, and the high layer signaling includes a radio resource control, RRC, signaling or a medium access control, MAC, layer signaling; and obtaining the N from the high layer signaling or the physical layer special signaling.

With reference to any one possible implementation manner of the first aspect to the fourth possible implementation manner of the first aspect, in a fifth possible implementation manner of the first aspect, theThe measurement module is also used for respectively taking the i codebooks as a codebook group Z_iMeasuring a channel to obtain M results, wherein i is 1,2, …, M, and M is the number of codebooks in the codebook space of the receiving node;

the obtaining module is specifically configured to determine, from the M results, a codebook group Z with the best channel quality_iThe codebook group Z_iThe number i of the middle codebooks is used as the number N of the codebooks in the codebook group to be measured;

the sending module is further configured to send a notification message to the transmitting node, where the notification message includes the N.

With reference to any one possible implementation manner of the first aspect to the fifth possible implementation manner of the first aspect, in a sixth possible implementation manner of the first aspect, the receiving node further includes:

a receiving module, configured to receive, from time N, the N encoded data sent by the transmitting node after the sending module reports the information of the codebook group to the transmitting node;

and the demodulation module is used for demodulating the N coded data to obtain the data to be sent.

With reference to the sixth possible implementation manner of the first aspect, in a seventh possible implementation manner of the first aspect, the sending module is further configured to send a correct response acknowledgement message to the transmitting node at a time N + N-1+ m after the receiving module receives the N encoded data sent by the transmitting node from the time N, or send an incorrect response acknowledgement message to the transmitting node at a time N + N-1+ m, where m is a preset value.

With reference to the seventh possible implementation manner of the first aspect, in an eighth possible implementation manner of the first aspect, the receiving module is further configured to receive, at N + Rt, the N coded data retransmitted by the transmitting node after the sending module sends an incorrect response acknowledgement message to the transmitting node at N + N-1+ m, where t is a hybrid retransmission round-trip delay, and R is greater than or equal to 1.

With reference to any one of the first aspect to the eighth possible implementation manner of the first aspect, in a ninth possible implementation manner of the first aspect, the sending module is further configured to send, to the transmitting node, a CQI based on a codebook group after the measuring module measures a channel to obtain the codebook group of the channel, where the CQI is an average CQI calculated based on N codebooks in the codebook group or a single CQI calculated based on any one codebook in the codebook group.

A second aspect provides a transmitting node comprising:

the receiving module is used for receiving information of a codebook group sent by a receiving node, wherein the codebook group comprises N codebooks, and N is more than or equal to 1;

and the processing module is used for performing precoding processing on data to be sent by using the N codebooks in the codebook group respectively to generate N coded data.

With reference to the second aspect, in a first possible implementation manner of the second aspect, the processing module is further configured to generate, from M codebooks in a codebook space of the transmitting node, a codebook space composed of at least two codebook groups, where each codebook group in the codebook group space is composed of N codebooks.

With reference to the first possible implementation manner of the second aspect, in a second possible implementation manner of the second aspect, a part of codebooks in at least two codebook groups in the codebook group space are the same.

With reference to the first or second possible implementation manner of the second aspect, in a third possible implementation manner of the second aspect, the receiving module is specifically configured to receive an index number, in the codebook group space, of the codebook group sent by the receiving node.

With reference to any one possible implementation manner of the second aspect to the third possible implementation manner of the second aspect, in a fourth possible implementation manner of the second aspect, the transmitting node further includes: a sending module, configured to send a high-level signaling or a physical layer dedicated signaling to a receiving node before the receiving module receives information of a codebook group sent by the receiving node, where the high-level signaling or the physical layer dedicated signaling includes N, the high-level signaling includes an RRC signaling or an MAC layer signaling, and N is preset by the sending node.

With reference to any one possible implementation manner of the second aspect to the third possible implementation manner of the second aspect, in a fifth possible implementation manner of the second aspect, the receiving module is further configured to receive N sent by a receiving node before receiving information of a codebook group sent by the receiving node, where N is obtained after the receiving node measures a channel.

With reference to any one of the second aspect to the fifth possible implementation manner of the second aspect, in a sixth possible implementation manner of the second aspect, the sending module is further configured to, after the processing module performs precoding processing on data to be sent by using N codebooks in the codebook group, respectively, and generates N encoded data, sequentially send the N encoded data to the receiving node at N consecutive times from a time N.

With reference to the sixth possible implementation manner of the second aspect, in a seventh possible implementation manner of the second aspect, the receiving module is further configured to, after the sending module sends the N encoded data to the receiving node sequentially at N consecutive times from time N, receive a correct response confirmation message sent by the receiving node at N + N-1+ m time, or receive an incorrect response confirmation message sent by the receiving node at N + N-1+ m time, where m is a preset value.

With reference to the seventh possible implementation manner of the second aspect, in an eighth possible implementation manner of the second aspect, the sending module is further configured to, after the receiving module receives an incorrect response acknowledgement message sent by the receiving node at N + N-1+ m, retransmit the N encoded data to the receiving node at N + Rt, where t is a hybrid retransmission round-trip delay, and R is greater than or equal to 1.

With reference to any one of the second aspect to the eighth possible implementation manner of the second aspect, in a ninth possible implementation manner of the second aspect, the receiving module is further configured to receive a CQI, which is sent by a receiving node and is based on a codebook group, after receiving information of the codebook group sent by the receiving node, where the CQI is an average CQI calculated based on N codebooks in the codebook group or a single CQI calculated based on any one codebook in the codebook group.

A third aspect provides a channel measurement method, including:

the receiving node acquires the number N of codebooks in a codebook group to be measured, wherein N is more than or equal to 1;

the receiving node measures a channel to obtain a codebook group of the channel, wherein the codebook group comprises N codebooks;

and the receiving node reports the information of the codebook group to the transmitting node.

With reference to the third aspect, in a first possible implementation manner of the third aspect, after the receiving node acquires the number N of codebooks in the codebook group to be measured, the method further includes:

the receiving node generates M codebooks in a codebook space of the receiving node into a codebook group space composed of at least two codebook groups, wherein each codebook group in the codebook group space is composed of N codebooks.

With reference to the first possible implementation manner of the third aspect, in a second possible implementation manner of the third aspect, a part of codebooks in at least two codebook groups in the codebook group space are the same.

With reference to the first or second possible implementation manner of the third aspect, in a third possible implementation manner of the third aspect, the reporting, by the receiving node, the information of the codebook group to the transmitting node includes:

and the receiving node reports the index number of the codebook group in the codebook group space to the transmitting node.

With reference to any one possible implementation manner of the third aspect to the third possible implementation manner of the third aspect, in a fourth possible implementation manner of the third aspect, the acquiring, by the receiving node, the number N of codebooks in a codebook group corresponding to the receiving node includes:

the receiving node receives a high-level signaling or a physical layer dedicated signaling sent by the transmitting node, wherein the high-level signaling or the physical layer dedicated signaling comprises the N, and the high-level signaling comprises a Radio Resource Control (RRC) signaling or a Medium Access Control (MAC) layer signaling;

the receiving node obtains the N from the high layer signaling or the physical layer dedicated signaling.

With reference to any one possible implementation manner of the third aspect to the fourth possible implementation manner of the first aspect, in a fifth possible implementation manner of the third aspect, the acquiring, by the receiving node, the number N of codebooks in a codebook group corresponding to the receiving node includes:

the receiving node takes i codebooks as a codebook group Z_iMeasuring a channel to obtain M results, wherein i is 1,2, …, M, and M is the number of codebooks in the codebook space of the receiving node;

the receiving node determines the codebook group Z with the best channel quality in the M results_iThe codebook group Z_iThe number i of the middle codebooks is used as the number N of the codebooks in the codebook group to be measured;

the method further comprises the following steps:

the receiving node sends a notification message to the transmitting node, the notification message including the N.

With reference to any one of the third aspect to the fifth possible implementation manner of the third aspect, in a sixth possible implementation manner of the third aspect, after the reporting, by the receiving node, the information of the codebook group to the transmitting node, the method further includes:

the receiving node receives the N coded data sent by the transmitting node from a moment N;

and the receiving node demodulates the N coded data to obtain the data to be sent.

With reference to the sixth possible implementation manner of the third aspect, in a seventh possible implementation manner of the third aspect, after the receiving node receives, from time N, the N pieces of encoded data sent by the transmitting node, the method further includes:

the receiving node sends a correct response confirmation message to the transmitting node at the moment of N + N-1+ m, wherein m is a preset value;

or the receiving node sends an incorrect response confirmation message to the transmitting node at the moment N + N-1+ m.

With reference to the seventh possible implementation manner of the third aspect, in an eighth possible implementation manner of the third aspect, after the receiving node sends a response confirmation message that the receiving node is incorrect to the transmitting node at time N + N-1+ m, the method further includes

And the receiving node receives the N coded data retransmitted by the transmitting node at the moment of N + Rt, wherein t is the hybrid retransmission round-trip delay, and R is more than or equal to 1.

With reference to any one of the third to the eighth possible implementation manners of the third aspect, in a ninth possible implementation manner of the third aspect, after the measuring, by the receiving node, a channel to obtain a codebook group of the channel, the method further includes:

and the receiving node sends a Channel Quality Indicator (CQI) based on the codebook group to the transmitting node, wherein the CQI is an average CQI calculated based on N codebooks in the codebook group or a single CQI calculated based on any one codebook in the codebook group.

A fourth aspect provides a channel measurement method, comprising:

the method comprises the steps that a transmitting node receives information of a codebook group sent by a receiving node, wherein the codebook group comprises N codebooks, and N is more than or equal to 1;

and the transmitting node uses the N codebooks in the codebook group to perform precoding processing on data to be transmitted respectively to generate N coded data.

With reference to the fourth aspect, in a first possible implementation manner of the fourth aspect, the method further includes:

the transmitting node generates M codebooks in the codebook space of the transmitting node into a codebook space composed of at least two codebook groups, wherein each codebook group in the codebook group space is composed of N codebooks.

With reference to the first possible implementation manner of the fourth aspect, in a second possible implementation manner of the fourth aspect, a part of codebooks in at least two codebook groups in the codebook group space are the same.

With reference to the first or second possible implementation manner of the fourth aspect, in a third possible implementation manner of the fourth aspect, the receiving, by the transmitting node, information of a codebook group sent by a receiving node includes:

and the transmitting node receives the index number of the codebook group in the codebook group space, which is sent by the receiving node.

With reference to any one possible implementation manner of the fourth aspect to the third possible implementation manner of the fourth aspect, in a fourth possible implementation manner of the fourth aspect, before the receiving, by the transmitting node, information of the codebook group sent by the receiving node, the method further includes:

the transmitting node sends a high-level signaling or a physical layer dedicated signaling to the receiving node, where the high-level signaling or the physical layer dedicated signaling includes the N, and the high-level signaling includes a Radio Resource Control (RRC) signaling or a Medium Access Control (MAC) layer signaling, so that the receiving node obtains the N from the high-level signaling or the physical layer dedicated signaling, where the N is preset by the transmitting node.

With reference to any one possible implementation manner of the fourth aspect to the third possible implementation manner of the fourth aspect, in a fifth possible implementation manner of the fourth aspect, before the receiving, by the transmitting node, information of a codebook group sent by the receiving node, the method further includes:

and the transmitting node receives the N sent by the receiving node, wherein the N is obtained after the receiving node measures the channel.

With reference to any one of the fourth to the fifth possible implementation manners of the fourth aspect, in a sixth possible implementation manner of the fourth aspect, after the performing, by the transmitting node, precoding processing on data to be transmitted by using N codebooks in the codebook group, and generating N encoded data, the method further includes:

and the transmitting node sequentially transmits the N coded data to the receiving node at N continuous time moments from the time moment N.

With reference to the sixth possible implementation manner of the fourth aspect, in a seventh possible implementation manner of the fourth aspect, after the transmitting node sequentially sends the N encoded data to the receiving node at N consecutive times from a time N, the method further includes:

the transmitting node receives a correct response confirmation message sent by the receiving node at the moment of N + N-1+ m, wherein m is a preset value;

or the transmitting node receives an incorrect response confirmation message sent by the receiving node at the moment N + N-1+ m.

With reference to the seventh possible implementation manner of the fourth aspect, in an eighth possible implementation manner of the fourth aspect, after the receiving node receives the incorrect response acknowledgement message sent by the receiving node at time N + N-1+ m, the method further includes:

and the transmitting node retransmits the N coded data to the receiving node at the moment of N + Rt, wherein t is the hybrid retransmission round-trip delay, and R is more than or equal to 1.

With reference to any one possible implementation manner of the fourth aspect to the eighth possible implementation manner of the fourth aspect, in a ninth possible implementation manner of the fourth aspect, after the receiving, by the transmitting node, information of a codebook group sent by the receiving node, the method further includes:

and the transmitting node receives the CQI based on the codebook group, which is sent by the receiving node, wherein the CQI is an average CQI calculated based on N codebooks in the codebook group or a single CQI calculated based on any one codebook in the codebook group.

In the method and the device for measuring a channel provided by this embodiment, the number N of codebooks in the codebook group is obtained, the channel is measured to obtain the codebook group including the N codebooks, and then the codebook group is fed back to the transmitting node, so that the transmitting node uses the N codebooks in the codebook group to perform precoding processing on data to be transmitted, and then transmits the data, thereby improving the accuracy of measuring and feeding back the channel.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a receiving node according to a first embodiment of the present invention;

fig. 2 is a schematic structural diagram of a second receiving node according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a data transceiving timing sequence;

FIG. 4 is a timing diagram illustrating data transceiving and retransmission;

fig. 5 is a schematic structural diagram of a transmitting node according to a first embodiment of the present invention;

fig. 6 is a schematic structural diagram of a second transmitting node according to an embodiment of the present invention;

fig. 7 is a flowchart of a first embodiment of a channel measurement method according to the present invention;

fig. 8 is a flowchart of a second embodiment of a channel measurement method according to the present invention;

fig. 9 is a flowchart of a third embodiment of a channel measurement method according to the present invention;

fig. 10 is a flowchart of a fourth embodiment of a channel measurement method according to the present invention;

fig. 11 is a flowchart of a fifth embodiment of a channel measurement method according to the present invention;

fig. 12 is a flowchart of a sixth embodiment of a channel measurement method according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

For high-frequency beams, increasing the antenna gain inevitably leads to narrowing the beams, in a multi-antenna system, the antenna gain can be increased by adopting a method of combining a plurality of antenna elements into one antenna port by virtual weighting, and the method of combining M antenna elements into one antenna port by virtual weighting is called 1-drive-M. The larger the number of M, the narrower the beam, for example, 1 driving 16 beams by 6.5 degrees, 1 driving 32 beams by 3.2 degrees, and 1 driving 64 beams by 1.6 degrees.

If a narrower beam is applied for cellular communication, the accuracy of beam tracking needs to be high. For example, the pitch angle of users in 1-8 floors in a building at the edge of a cell varies with different cell radii, as shown in table 1.

TABLE 1

Number of layers

Pitching angle (inter-cell distance 500 m)

Pitching angle (inter-cell distance 200 meters)

1 layer of	0.3438 degree	0.8594 degrees
			2 layers of	1.0312 degrees	2.5766 degrees
3 layers of	1.7184 degrees	4.2892 degrees
			4 layers of	2.405 degree	5.9941 degrees
5 layers of	3.09 degree	7.6884 degrees
			6 layers of	3.776 degrees	9.3694 degrees
7 layers of	4.46 degree	11.0342 degrees
			8 layers of	5.1428 degrees	12.68 degree

As can be seen from table 1, in the scene of the cell interval of 500 meters, in the buildings at the edge of the cell, the pitch angles between users on adjacent floors are only about 0.7 degrees apart. If a narrower beam is used, for example 1.6 degrees, then a smaller angle of beam deviation may result in a larger antenna gain difference.

Therefore, for narrower beams, more precise measurement and feedback of channel quality are required, so as to improve the accuracy and precision of the corresponding beams after signal weighting.

Considering that the channel coherence time and the carrier frequency are inversely proportional, the channel coherence time at high frequencies is reduced proportionally compared to low frequencies. The shorter the channel coherence time is, the faster the time domain response of the channel changes, so that under the same time domain granularity, feeding back a codebook group containing a plurality of codebooks will reflect the time domain change of the channel more accurately than feeding back only one codebook. Based on the above reasons, embodiments of the present invention provide a method and an apparatus for measurement and feedback, where a set of codebook spaces with codebook groups as the minimum granularity is predefined at a receiving end and a transmitting end, each codebook space includes N codebooks, the receiving end feeds back a codebook group including the N codebooks to the transmitting end based on measurement on a channel, the transmitting end performs precoding weighting on the same data with each codebook in the codebook group in the next N transmissions and then transmits the data to the receiving end, and the receiving end demodulates the data received N times, so as to obtain the data transmitted by the transmitting end. Because the codebook group comprises N codebooks, when N is larger than 1, the codebook group fed back by the receiving end can better reflect the change condition of the channel than one codebook, and after the receiving end receives data which is sent by the transmitting end through precoding the same data according to a plurality of codebooks in the codebook group, the data obtained through demodulation can better eliminate the influence of the channel change on the data. The more the number N of codebooks in the codebook group is, the more accurate the fed back channel quality is, and when N is equal to 1, the measurement and feedback scheme for feeding back only one codebook is obtained.

Fig. 1 is a schematic structural diagram of a receiving node according to a first embodiment of the present invention, and as shown in fig. 1, the receiving node according to this embodiment includes:

the obtaining module 11 is configured to obtain the number N of codebooks in the codebook group to be measured, where N is greater than or equal to 1.

Specifically, the receiving node provided in this embodiment may be any network node having channel measurement and feedback functions in a network, and generally, the receiving node may be a User Equipment (UE).

In the current channel measuring method, the receiving node only needs one codebook for measuring and feeding back the channel each time, and the transmitting node receiving the feedback performs precoding processing on the data to be transmitted according to the codebook and then transmits the data to the receiving end. However, with the introduction of high frequency, the beam transmitted by the transmitting node is also correspondingly narrowed to meet the requirement of larger antenna gain, so that the accuracy of the beam needs to be improved, that is, the accuracy of the channel measurement and feedback of the receiving node needs to be improved. Considering the corresponding relationship among frequency, channel coherence time and time domain response, under the time domain granularity of sending data once on the carrier frequency with lower frequency, the data can be sent for many times on the carrier frequency with higher frequency, therefore, when the carrier frequency with higher frequency is used for sending data, the receiving end can measure and feed back a plurality of codebooks under the time domain granularity, so that the transmitting node can send the same data when sending for many times by using a plurality of codebooks, thereby better matching and coping with channel change, and improving the precision of the beam for data transmission. The number of codebooks in the codebook group for measuring and feeding back the channel by the receiving node directly influences the precision of channel measurement and feedback at high frequency.

Therefore, the receiving node provided in this embodiment includes an obtaining module 11, configured to obtain the number N of codebooks in the codebook group to be measured, where N ≧ 1. The size of N may be predefined by the receiving node and the transmitting node, and then the size of N may be preset in the system configuration of the receiving node, and the obtaining module 11 obtains the size of N from the preset system configuration; or the size of N may be preset in the system configuration of the transmitting node, and the obtaining module 11 obtains the size of N from the configuration signaling sent by the transmitting node; or the size of N is obtained by the acquisition module 11 after measuring the channel.

In the current channel measurement method, the receiving node only measures the channel and feeds back fixed N-1 codebooks each time. However, in the receiving node provided in this embodiment, the size of N may be dynamically configured, and the obtaining module 11 obtains the number of N, which is the process of dynamically configuring N. When the number of N acquired by the acquiring module 11 is equal to 1, the receiving node will measure and feed back the channel according to the existing scheme of measuring and feeding back only one codebook. When the number of N acquired by the acquiring module is greater than 1, the codebook group fed back by the receiving node can match and reflect the channel variation better than the case of feeding back only one codebook.

The measurement module 12 is configured to measure a channel to obtain a codebook group of the channel, where the codebook group includes N codebooks.

Specifically, after the obtaining module 11 obtains the number N of codebooks in the codebook group, the measuring module 12 measures the channel to obtain the codebook group corresponding to the channel, where the measured codebook group includes N codebooks.

In the receiving node, a codebook space composed of a plurality of codebooks is stored, the codebook space is provided with M codebooks in total, N of the M codebooks are grouped into one group, the codebook space can be divided into P codebook groups in total, and the codebooks in every two codebook groups can be mutually overlapped. The measurement module 12 selects a codebook group with the best channel quality from the P codebook groups based on the measurement of the channel, that is, the selection of the codebook group after the channel measurement is completed.

For example, the number of codebooks M in the codebook space is 32, where the 32 codebooks are numbered 0, 1,2, …, and 31, respectively. The number of N acquired by the acquiring module 11 is 4, and it is assumed that 32 codebooks in the codebook space correspond to 32 beams uniformly divided in the [0, 2 pi ] space. With every 4 adjacent codebooks as a group, the whole codebook space is divided into 32 codebook groups, and the codebook numbers corresponding to the 32 codebook groups are {0, 1,2, 3}, {1, 2, 3, 4}, {2, 3, 4, 5}, …, {30, 31, 0, 1}, and {31, 0, 1, 2}, respectively. The measurement module 12 may measure the Channel Quality by using 4 codebooks in 32 codebook groups respectively based on the measurement reference signal sent by the transmitting node, and use a sum of the Channel qualities obtained by measuring the Channel by using the 4 codebooks in each codebook group as the Channel Quality corresponding to the codebook group, where the Channel Quality obtained by measuring the Channel Quality by using each codebook may be, for example, a Channel Quality Indicator (CQI). Or the measuring module 12 further uses the capacity corresponding to the CQI obtained by measuring the channel quality by each codebook as the channel quality. In summary, after the measurement module 12 measures the channel, a codebook group that best matches and reflects the channel characteristics is selected from the 32 codebook groups.

And a sending module 13, configured to report the information of the codebook group to a transmitting node.

Specifically, the sending module 13 sends the information of the codebook group measured by the measuring module 12 to the transmitting node, that is, the measurement and feedback of the channel are completed. In the transmitting node, a codebook space composed of a plurality of codebooks is also stored, and each codebook and the codebook number in the codebook space are the same as those in the receiving node, so that the sending module 13 only needs to send the index or the number of each codebook group to the transmitting node when sending the codebook group to the transmitting node.

After the transmitting node receives the index or the number of the codebook group reported by the transmitting module 13, the transmitting node performs precoding processing on the same data to be transmitted by using N codebooks in the corresponding codebook group, generates N coded data, and transmits the N coded data in the next N transmissions. When the receiving node performs measurement and feedback processing on a channel, because each codebook group measured and fed back by the receiving node comprises a plurality of codebooks, and the plurality of codebooks in each codebook group are used for enabling the transmitting node to perform precoding processing on the same data for multiple times and transmit the data, the scheme for measuring and feeding back one codebook group comprising a plurality of codebooks by the receiving node provided by the implementation can better match and reflect the state of the channel, thereby improving the precision of the transmitting node for transmitting the data.

In the receiving node provided in this embodiment, the number N of the codebooks in the codebook group is obtained, the channel is measured to obtain the codebook group including the N codebooks, and then the codebook group is fed back to the transmitting node, so that the transmitting node uses the N codebooks in the codebook group to perform precoding processing on data to be transmitted, and then transmits the data, thereby improving the accuracy of measurement and feedback on the channel.

Further, in the embodiment shown in fig. 1, the obtaining module 11 is further configured to, after obtaining the number N of codebooks in the codebook group to be measured, generate a codebook group space composed of at least two codebook groups from M codebooks in the codebook space of the receiving node, where each codebook group in the codebook group space is composed of N codebooks.

Specifically, the same codebook space is preset in both the receiving node and the transmitting node, and the codebook space includes M codebooks. After the obtaining module 11 obtains the number N of codebooks in the codebook group to be measured, the obtaining module 11 may generate, from the M codebooks in the codebook space, a codebook group space composed of a plurality of codebook groups, where the codebook group space includes at least two codebook groups, and each codebook group in the codebook group space is composed of N codebooks. Thus, when the measurement module 12 measures the channel, the measurement module can use each codebook group in the codebook group space to measure the channel, and does not need to select N codebooks from the codebook space to form the codebook group. Meanwhile, in the transmitting node, the codebook group space which is the same as that in the receiving node is generated according to the same strategy as that of the receiving node, so that when the receiving node reports the measured information of the codebook group to the transmitting node, only the index number or the serial number of the codebook group in the codebook group space needs to be reported, and the resources required for reporting the codebook group are reduced.

Further, in the embodiment shown in fig. 1, a part of codebooks in at least two codebook groups in the codebook group space are the same. That is, the codebooks contained in the respective codebook groups in the codebook group space generated by the obtaining module 11 may be multiplexed, so that more codebook groups may be generated using M codebooks in the codebook space.

Further, in the embodiment shown in fig. 1, the sending module 12 is specifically configured to report, to the transmitting node, the index number of the codebook group in the codebook group space.

Further, in the embodiment shown in fig. 1, the method for acquiring the number N of codebooks in the codebook group by the acquiring module 11 may be: the obtaining module 11 obtains N from a preset system configuration; or the obtaining module 11 obtains N from the signaling sent by the transmitting node; or the obtaining module 11 obtains N according to the measurement result after measuring the channel.

In an implementation manner, the number N of codebooks in a codebook group is preset in both the receiving node and the transmitting node, and the obtaining module 11 obtains N from a preset system configuration, so that after the transmitting module 13 reports the codebook group including the N codebooks to the transmitting node, the transmitting node can also obtain the number of N in the codebook group according to the preset system configuration, thereby extracting each codebook from the corresponding codebook group.

In another implementation manner, only the number N of codebooks in a codebook group is preset in a transmitting node, and the obtaining module 11 receives a high-level signaling or a physical layer dedicated signaling sent by the transmitting node, where the high-level signaling or the physical layer dedicated signaling includes the N, and the high-level signaling includes an RRC signaling or an MAC layer signaling; and obtaining the N from the high layer signaling or the physical layer special signaling. Generally, a transmitting node is a base station in a network, a receiving node is user equipment in the network, various network configuration information is stored in the base station, and the base station sends the network configuration information to the user equipment through signaling according to needs. Corresponding to the embodiment of the invention, N is preset in the transmitting node, N is carried in the high-level signaling or the physical-layer signaling sent to the receiving node by the transmitting node, and N is obtained from the high-level signaling or the physical-layer signaling by the receiving module 11. The higher layer signaling may be Radio Resource Control (RRC) signaling or Medium Access Control (MAC) layer signaling. Thus, after the sending module 23 reports the codebook group including the N codebooks to the transmitting node, the transmitting node can obtain the number of N in the codebook group according to the preset system configuration, thereby extracting each codebook from the codebook group.

In another implementation manner, if the number N of codebooks in the codebook group is not preset in both the transmitting node and the receiving node, the measuring module 12 is further configured to use i codebooks as the codebook group Z_iMeasuring a channel to obtain M results, wherein i is 1,2, …, M, and M is the number of codebooks in the codebook space of the receiving node; an obtaining module 11, configured to determine, from the M results, a codebook group Z with the best channel quality_iThe codebook group Z_iThe number i of the middle codebooks is used as the number N of the codebooks in the codebook group to be measured; a sending module 13, configured to send a notification message to the transmitting node, where the notification message includes the N. That is to say, the number N of codebooks in the codebook group is a dynamic value, the obtaining module 11 in the receiving node determines the value of N according to the condition that the measuring module 12 measures the channel, and then the sending module 13 sends the value of N to the transmitting node through the notification message. Thus, when the sending module 13 is sent to the transmitting nodeAfter reporting the information of the codebook group including the N codebooks, the transmitting node may obtain the N codebooks in the codebook group according to a preset system configuration. Since the number N of codebooks in the codebook group is obtained by the obtaining module 11 according to the measurement performed by the measuring module 12 on the channel, the number N is related to the channel state, and the codebook group including N codebooks can better reflect the state of the channel. For example, since N codebooks in a codebook group are used for a transmitting node to transmit the same data in N transmissions, the greater the value of N, the higher the accuracy of the data. In addition, the higher the carrier frequency, the shorter the time required for sending N times of data, so the measurement module 12 can measure the channel carrier frequency to determine the value of N, and thus the transmitting node can save system resources as much as possible on the premise of ensuring the accuracy of data.

The specific method for measuring the N by the receiving node is as follows: the measurement module 12 uses i codebooks as codebook group Z_iMeasuring the channel to obtain M results, i is 1,2, …, M, where M is the number of codebooks in the codebook space of the receiving node, that is, the measuring module 12 traverses the combination of all codebook groups in the codebook space to measure the channel by each codebook group. Then, the obtaining module 11 determines the codebook group Z with the best channel quality among the M results_iThe codebook group Z_iAnd taking the number i of the medium codebooks as the number N of the codebooks in the codebook group to be measured, namely obtaining the number N of the codebooks in the codebook group. Then the sending module 13 is further configured to send a notification message to the transmitting node, where the notification message includes the N.

Fig. 2 is a schematic structural diagram of a second embodiment of a receiving node according to the present invention, and as shown in fig. 2, the receiving node according to this embodiment further includes, on the basis of the embodiment shown in fig. 1:

a receiving module 14, configured to receive, from time N, the N encoded data sent by the transmitting node after the sending module 13 reports the information of the codebook group to the transmitting node.

Specifically, after the sending module 13 reports the codebook group to the sending node, the sending node performs precoding processing on the same data to be sent by using N codebooks in the codebook group to obtain N coded data, and sends the N coded data to the receiving node sequentially at N consecutive times from time N. The receiving module 14 in the receiving node receives the N encoded data starting from time N.

A demodulation module 15, configured to demodulate the N encoded data to obtain the data to be sent.

Specifically, after the receiving module 14 receives the N encoded data, the demodulating module 15 may demodulate the N encoded data. Since the transmitting node uses the codebook group including N codebooks to encode the data to be transmitted to generate N encoded data, and the codebook group including N codebooks is transmitted to the transmitting node by the receiving node through the transmitting module 13, the receiving node stores the codebook group, so that the demodulating module 15 can demodulate the N encoded data according to the codebook group to obtain the data to be transmitted by the transmitting node.

Because the data to be transmitted sent by the transmitting node is transmitted after being coded by using the codebook group comprising the N codebooks, the same data is sent by different precoding weights, namely the data is sent to a plurality of directions at the same time, so that the data received and demodulated by the receiving node has higher accuracy and reliability, and the data transmission error caused by the angle deviation of a narrower beam can be greatly reduced.

In this document [ ] denotes a matrix or vector; denotes a set.

Taking 4 transmitting antennas as an example, a specific codebook group design method is given below, where codebook space B includes 32 codebooks B₀、b₁、…、b₃₁The number N of codebooks in each codebook group is 4.

X^(k)∈{[b_kmod32 b_(k+1)mod32 b_(k+2)mod32 b_(k+3)mod32]:^k＝0,1,K,31} (2)

C＝{X⁽⁰⁾,X⁽¹⁾,X⁽²⁾,K,X⁽³¹⁾} (3)

Wherein the content of the first and second substances,

m denotes the number of transmitting antennas, n denotes the number of codebooks in the codebook space, X^(k)Representing a group of N codebooks, X^(k)Corresponding to the weighting matrix on the transmitting end antenna, C being represented by different X^(k)A set of codebook groups. After the receiving node obtains the number of N, the same codebook group X can be generated according to a preset rule^(k)The same codebook group X^(k)As a set, C, the receiving node selects one X of C after measuring the channel^(k)Sent as measurement results to the transmitting node (here only said X may be sent)^(k)The corresponding index or number). Actually, after acquiring N in the transmitting node, generating a set C of codebook groups according to the method, and after the receiving node measures the channel, only reporting X in C to the transmitting node^(k)That is, the corresponding codebook group is reported to the transmitting node. The codebook in the formula (1) may have a codebook structure of any other form than the above-described codebook form.

The codebook group design methods given by equations (1) to (3) give specific design methods for a single codebook type codebook group, but in practical applications, the codebook group may also be a double codebook type codebook group.

When the structure of the codebook W in the codebook space is a double codebook form, wherein the matrix X₁Is according to theta₁Determined, matrix X₂Is according to theta₂And determined, theta₁A phase difference, theta, representing a weighted value of the transmission signal of the same transmission layer for two adjacent antennas in the first antenna group of the transmission node₂The phase difference of two adjacent antennas in the second antenna group of the transmitting node aiming at the same transmission layer transmitting signal weighted value is represented, the phase difference of the first antenna group and the second antenna group aiming at the same transmission layer transmitting signal weighted value is represented, M is a positive integer, M represents the phase difference number of the first antenna group and the second antenna group aiming at the same transmission layer transmitting signal weighted value, n is a non-negative integer smaller than M, and the first antenna group and the second antenna group belong to the same multi-antenna system.

The codebook W may also be expressed as W ═ W₁×W₂A form of (1), wherein W₁May be referred to as a first codebook, W₁Corresponds to one and X₁(θ₁) Associated wideband or long-term precoding matrices, W, reflecting long-term/average variation characteristics of the channel₂May be referred to as a second codebook, W₂Corresponding to a related short-term precoding matrix reflecting the short-term/instantaneous variation characteristics of the channel.

B＝[X⁽⁰⁾,X⁽¹⁾,X⁽²⁾,K,X⁽³¹⁾] (4)

V^(k)∈{[X^(2kmod32)，X^{((2k+1)mod32)}，X^{((2k+2)mod32)}，X^{((2k+3)mod32)}]:k＝0,1,K,15} (5)

If the structure of the codebook W is a double-codebook form, W in W can be used₁The codebook space of (2) is designed as a codebook space composed of a plurality of codebook groups, and for example, with 8 transmitting antennas, assume that a codebook group space B is composed of 32 codebook groups in formula (3), and the 32 codebook groups in B further form chunks of codebook groups corresponding to 16 mutually overlapped first antenna groups according to formula (5). Each V^(k)Consists of 4 codebook groups in equation (4). And each V^(k)And according to the formula (5), a codebook group space formed by all codebook groups corresponding to the first antenna group and the second antenna group forms a codebook space of the first codebook in the dual codebook structure.

In design W₂When considering the number of transmission layers, different design methods are given for different numbers of transmission layers, where Rank1 to Rank4 represent the number of transmission layers from 1 to 4.

Rank1：

Rank2：

Rank3：

Rank4：

Wherein Y or Y_p(p is 1,2) is a selection matrix, and e_iTo select a column vector, e_iIs 1 and the other elements are 0. e.g. of the type_iSelected is the set C of codebook groups in equation (7)₁The codebook group of (1). For example when the number of transmission layers is 1,that is, when the value of Y is e in the case of Rank1₁When it is indicated that the codebook group set C is selected₁For example, when the number of transmission layers is 2, i.e., Rank2, Y is (e)₂，e₄) When it is indicated that the codebook group set C is selected₁A second codebook group and a fourth codebook group and C₂Extracting the selection matrix Y or Y_pThe sum of (p is 1,2) is a rotation matrix corresponding to the phase difference of the weighted values of the transmission signals of the first antenna group and the second antenna group for the same transmission layer.

After the receiving node measures the channel, C is selected₁And C₂One W of₂Together as a measurement result to the transmitting node. In fact, after obtaining N in the transmitting node, a set C of codebook groups is generated according to the method described above₁And C₂After the receiving node measures the channel, it only needs to report C to the transmitting node₁Number and C in (1)₂The sequence number of the medium value is that the corresponding codebook group is reported to the transmitting node.

Further, the sending module 13 is further configured to send, to the transmitting node, a CQI based on the codebook group after the measuring module 12 measures the channel and obtains the matched and applicable codebook group of the channel, where the CQI is an average CQI calculated based on N codebooks in the codebook group or a single CQI calculated based on any codebook in the codebook group.

Specifically, CQI is a measure of the quality of wireless channel communications. The CQI can represent channel measurements for a given channel. In general, a high value of CQI indicates a channel with better communication quality and vice versa. Since the measurement module 12 obtains a codebook group composed of N codebooks after channel measurement, and a plurality of codebooks in the codebook group collectively reflect channel quality as a whole, for the codebook group, only one CQI should be corresponded, instead of one CQI for each codebook in the codebook group. Therefore, the CQI transmitted by the transmitting module 13 to the transmitting node is an average CQI calculated based on CQIs corresponding to a plurality of codebooks in the codebook group, or a single CQI calculated based on any codebook in the codebook group.

Further, the sending module 14 is further configured to, after the receiving module 13 receives the N encoded data sent by the transmitting node from time N, send a correct response confirmation message to the transmitting node at time N + N-1+ m, or send an incorrect response confirmation message to the transmitting node at time N + N-1+ m. The m is a preset value, and optionally, the m may be set as a time for the transmitting node to receive and process the nth encoded data. And the time n is the time when the sending node sends the first codebook in the codebook group.

Specifically, after the transmitting node receives the codebook group sent by the sending module 13, the receiving module 14 receives the N encoded data sent by the transmitting node from time N, and at this time, the receiving node should feed back to the transmitting node a response message indicating whether the receiving node receives the data correctly. If the channel measurement method of the codebook group is not adopted, that is, the receiving node only feeds back one codebook each time, the receiving node sends a correct Acknowledgement (ACK) message or an incorrect Acknowledgement (NACK) message to the transmitting node after a certain time after receiving the data sent by the transmitting node after being encoded according to the codebook. However, if the sending module 13 feeds back a codebook group including N codebooks to the sending node, since the sending node uses the N codebooks in the codebook group to encode and send the same data, the receiving node does not feed back an ACK or NACK message for each encoded data sent by the sending node, but feeds back an ACK or NACK message to the sending node after receiving the N encoded data and obtaining the data to be sent by demodulating. That is, the receiving node feeds back only one ACK or NACK message for the data to be transmitted corresponding to one codebook group.

Fig. 3 is a schematic diagram of data transceiving timing, where timing 31 is downlink timing of a transmitting node when transmitting using a single codebook, timing 32 is uplink timing of a receiving node when transmitting using a single codebook, timing 33 is downlink timing of a transmitting node when transmitting using a codebook group, and timing 34 is uplink timing of a receiving node when transmitting using a codebook group, and fig. 3 illustrates that 4 codebooks are included in a codebook group. In the Downlink timing sequence of the transmitting node, the transmitting node uses a Physical Downlink Shared Channel (PDSCH) to send a coded data to the receiving node, and in the Uplink timing sequence of the receiving node, the receiving node uses a Physical Uplink Control Channel (PUCCH) to feed back ACK or NACK information to the transmitting node. Let one transmission of each PDSCH or PUCCH occupy one time instant. After receiving the data sent by the transmitting node, the receiving node needs to perform demodulation and other processing to confirm whether the data is received correctly, so a certain time interval is needed, and the time interval varies according to the capability of the receiving node, and the time is set as 4 moments in fig. 3.

If the single code scheme is adopted, at time 0, the transmitting node sends a coded data to the receiving node on the PDSCH 301, and at time 4, the receiving node sends an ACK or NACK message to the receiving node on the PUCCH 302 at time 4. If a codebook group scheme including 4 codebooks is adopted, the transmitting node sequentially transmits coded data to the receiving node at PDSCH 303, PDSCH 304, PDSCH 305 and PDSCH306 from time 0, and the receiving node transmits an ACK or NACK message to the transmitting node on PUCCH 307 at time 7(7 ═ 0+4-1+4) with an interval of 4 times. After summarizing, the receiving module 14 starts from time N, and after receiving the N encoded data sent by the transmitting node, the sending module 13 sends a correct response confirmation message to the transmitting node at time N + N-1+ m, where m is the time when the transmitting node receives and processes the nth encoded data.

Further, the receiving module 13 is further configured to, after the sending module 14 sends the response confirmation message that the receiving is incorrect to the transmitting node at time N + N-1+ m, receive the N coded data retransmitted by the transmitting node at time N + Rt, where t is a hybrid retransmission round-trip delay, where R ≧ 1, optionally,

specifically, after the receiving node processes the received data, if an ACK message is sent to the transmitting node, the receiving is successful; if a NACK message is sent to the transmitting node, it indicates that reception has failed, and if the transmitting node receives the NACK message, retransmission of data is required. In the scheme using the single codebook, the Time for the transmitting node to retransmit data is after transmitting data to the receiving node, and after a Round Trip Time (RTT) of a Hybrid Automatic Repeat reQuest (Hybrid Automatic Repeat reQuest) is separated, data is retransmitted. However, when the codebook group scheme including multiple codebooks is adopted, since the number N of codebooks in the codebook group is uncertain, in consideration of the situation that the number of codebooks is large, after receiving the NACK message, the transmitting node retransmits the data at the time N + Rt, where R ≧ 1, optionally, denotes rounding up, and t is the round-trip delay of the harq.

Fig. 4 is a schematic diagram of data transceiving and retransmission timing, where timing 31 is downlink timing of a transmitting node when transmitting using a single codebook, timing 32 is uplink timing of a receiving node when transmitting using a single codebook, timing 33 is downlink timing of a transmitting node when transmitting using a codebook group, and timing 34 is uplink timing of a receiving node when transmitting using a codebook group, and fig. 4 illustrates that 4 codebooks are included in a codebook group. Based on the data transmission and reception in fig. 3, the HARQ RTT is set to 8 times, if the single code scheme is adopted, at time 0 of HARQ RTT1, the transmitting node transmits one piece of encoded data to the receiving node on PDSCH 301, and at 4 times in interval, at time 4 of HARQ RTT1, the receiving node transmits an ACK or NACK message to the receiving node on PUCCH 302, and if the receiving node transmits a NACK message on PUCCH 302, the transmitting node retransmits the data to the receiving node on PDSCH 401 at time 0 of HARQ RTT 2. If a codebook group scheme including 4 codebooks is adopted, the transmitting node sequentially transmits the encoded data to the receiving node at PDSCH 303, PDSCH 304, PDSCH 305 and PDSCH306 from time 0 of HARQ RTT1, the receiving node transmits an ACK or NACK message to the transmitting node at PUCCH 307 at time 7 of HARQ RTT1 at an interval of 4 times, and if the receiving node transmits a NACK message at PUCCH 307, the transmitting node sequentially retransmits the data to the receiving node at PDSCH 402, PDSCH 403, PDSCH 404 and PDSCH 405 from time 0 of HARQ RTT 3.

It should be noted that, in the receiving node shown in fig. 1 and fig. 2, if the obtaining module 11 obtains the number N of codebooks in the codebook group to be measured, N is obtained from a preset system configuration; or acquiring N from the signaling sent by the transmitting node, the acquiring module 11 is connected to the measuring module 12, and the measuring module 12 is connected to the sending module 13. If the acquiring module 11 acquires the number N of codebooks in the codebook group to be measured in a manner that the measuring module 12 measures a channel and then acquires N according to a measurement result, the acquiring module 11 may also be directly connected to the transmitting module 13.

It should be noted that, in the receiving node shown in fig. 2, the connection relationship of the sending module 13, the receiving module 14, and the demodulating module 15 is only an example, and the sending module 13, the receiving module 14, and the demodulating module 15 may also be directly connected to each other, or other possible connection forms.

Fig. 5 is a schematic structural diagram of a transmitting node according to a first embodiment of the present invention, and as shown in fig. 5, the transmitting node according to the present embodiment includes:

the receiving module 51 is configured to receive information of a codebook group sent by a receiving node, where the codebook group includes N codebooks, and N is greater than or equal to 1.

Specifically, the transmitting Node provided in this embodiment may be a centralized control Node in a network, and generally, the transmitting Node may be a base station, for example, an Evolved Node B (eNB).

In the current channel measuring method, the receiving node only needs one codebook for measuring and feeding back the channel each time, and the transmitting node receiving the feedback performs precoding processing on the data to be transmitted according to the codebook and then transmits the data to the receiving end. However, with the introduction of high frequency, the beam transmitted by the transmitting node is also correspondingly narrowed to meet the requirement of large antenna gain, so that the accuracy of the beam needs to be improved, that is, the accuracy of the channel measurement and feedback of the receiving node needs to be improved. Considering the corresponding relationship among frequency, channel coherence time and time domain response, under the time domain granularity of sending data once on the carrier frequency with lower frequency, the data can be sent for many times on the carrier frequency with higher frequency, therefore, when the carrier frequency with higher frequency is used for data transmission, the receiving end can measure and feed back a plurality of codebooks under the time domain granularity, so that the transmitting node can send the same data when sending data for many times by using a plurality of codebooks, thereby better coping with and matching channel change and improving the precision of the beam corresponding to the sent data. The number of codebooks that the receiving node measures and feeds back the channel will directly affect the accuracy of the channel measurement and feedback.

Therefore, the transmitting node provided in this embodiment includes a receiving module 51, configured to receive information of a codebook group sent by the receiving node, where the codebook group includes N codebooks. And N is sent by the transmitting node to the receiving node or obtained by the receiving node after measuring a channel, and is more than or equal to 1. When N is equal to 1, the codebook group received by the receiving module 51 is only one codebook, and as long as N >1, the codebook group received by the receiving module 51 can reflect and match the channel variation better than only feeding back one codebook.

In the receiving node, a codebook space composed of a plurality of codebooks is stored, the codebook space is provided with M codebooks in total, N of the M codebooks are grouped into one group, the codebook space is divided into P codebook groups in total, and the codebooks in the two codebook groups can be mutually overlapped. And the receiving node selects an optimal codebook group from the P codebook groups based on the measurement of the channel, namely the optimal codebook group selection after the channel measurement is completed. In the transmitting node, a codebook space composed of a plurality of codebook groups is also stored, and each codebook group and the number of the codebook group in the codebook space are the same as those in the receiving node, so the receiving module 51 only needs to receive the number of each codebook group sent by the receiving node.

The processing module 52 is configured to perform precoding processing on data to be sent by using the N codebooks in the codebook group, respectively, to generate N encoded data.

Specifically, after the receiving module 51 receives the codebook group reported by the receiving node, the processing module 52 performs precoding processing on a same data to be sent by using N codebooks in the codebook group, respectively, to generate N coded data, and sends the N coded data in the next N transmissions, respectively, so as to complete the transmission of the N data precoded based on the N codebooks in the codebook group. Because the codebook group measured and fed back by the receiving node comprises a plurality of codebooks, and the plurality of codebooks in the codebook group are used for enabling the transmitting node to perform precoding processing on the same data and transmit the data, the transmitting node provided by the implementation can better reflect and match the channel state through the codebook group measured and fed back by the receiving node, and thus the precision of the transmitting node for transmitting the data is improved.

In the transmitting node provided by this embodiment, by receiving the codebook group sent by the receiving node, where the codebook group includes N codebooks, and then performing precoding processing on data to be sent by using the N codebooks in the codebook group, respectively, to generate N encoded data, thereby improving the accuracy of measuring and feeding back a channel.

Further, in the embodiment shown in fig. 6, the processing module 52 is further configured to generate a codebook space composed of at least two codebook groups from the M codebooks in the codebook space of the transmitting node, where each codebook group in the codebook group space is composed of N codebooks.

Specifically, the same codebook space is preset in both the receiving node and the transmitting node, and the codebook space includes M codebooks. When the receiving node reports the measured codebook group to the transmitting node, if the content of the whole codebook group is reported, more transmission resources need to be occupied, so that the receiving node can report only relevant information capable of characterizing the characteristics of the codebook group, such as index numbers or codes of the codebook group, to the transmitting node. However, since only the codebook space including M codebooks is pre-stored in the receiving node and the transmitting node, in the transmitting node, the processing module 52 is further configured to generate a codebook group space composed of a plurality of codebook groups from the M codebooks in the codebook space, where the codebook group space includes at least two codebook groups, and each codebook group in the codebook group is composed of N codebooks. Thus, when the receiving module 51 receives the information (e.g. index number or code) of the codebook group sent by the receiving node, the corresponding codebook group can be found in the codebook group space. Meanwhile, in the receiving node, the same codebook group space as that in the transmitting node is also generated according to the same strategy as that in the transmitting node. Therefore, when the receiving node reports the measured information of the codebook group to the transmitting node, only the index number or the serial number of the codebook group in the space of the codebook group needs to be reported, and the resources required by reporting the codebook group are reduced.

Further, in the embodiment shown in fig. 6, a part of codebooks in at least two codebook groups in the codebook group space are the same. That is, the codebooks contained in the respective codebook groups in the codebook group space generated by the processing module 52 may be multiplexed, so that more codebook groups may be generated using M codebooks in the codebook space.

Further, in the embodiment shown in fig. 6, the receiving module 51 is specifically configured to receive the index number of the codebook group in the codebook group space, where the index number is sent by the receiving node.

Fig. 6 is a schematic structural diagram of a second transmitting node according to an embodiment of the present invention, and as shown in fig. 6, a receiving node according to this embodiment further includes, on the basis of the embodiment shown in fig. 5:

a sending module 53, configured to send a high-level signaling or a physical layer dedicated signaling to a receiving node before the receiving module 51 receives information of a codebook group sent by the receiving node, where the high-level signaling or the physical layer dedicated signaling includes N, the high-level signaling includes an RRC signaling or an MAC layer signaling, and N is preset by the transmitting node.

Specifically, before the receiving node sends the codebook group, it needs to acquire the number N of codebooks in the codebook group, where there are various methods for the receiving node to acquire N. In the method provided in this embodiment, only the number N of codebooks in the codebook group is preset in the transmitting node, and the sending module 53 sends a high-level signaling or a physical layer dedicated signaling to the receiving node, where the high-level signaling or the physical layer dedicated signaling includes the N, and the high-level signaling includes an RRC signaling or an MAC layer signaling. When the receiving node receives the high layer signaling or the physical layer dedicated signaling sent by the sending module 53, N can be obtained.

In addition, the receiving node has another method for acquiring N, and the receiving node can acquire N from the system configuration preset by the receiving node; or the receiving node measures the channel and then obtains N according to the measurement result. If the receiving node acquires N by using this method, before the receiving module 51 receives the information of the codebook group sent by the receiving node, the receiving module 51 needs to receive the N sent by the receiving node.

Further, the receiving module 51 is further configured to receive, after receiving information of a codebook group sent by a receiving node, a CQI sent by the receiving node and based on the codebook group, where the CQI is an average CQI calculated based on N codebooks in the codebook group or a single CQI calculated based on any codebook in the codebook group.

Specifically, CQI is a measure of the quality of wireless channel communications. The CQI can represent channel measurements for a given channel. In general, a high value of CQI indicates a channel with better communication quality and vice versa. Since the codebook group received by the receiving module 51 is a codebook group consisting of N codebooks, and the codebooks in the codebook group collectively reflect the channel quality as a whole, only one CQI should be assigned to the codebook group, not one CQI for each codebook in the codebook group. Therefore, the CQI received by the receiving module 51 is an average CQI calculated based on CQIs corresponding to a plurality of codebooks in the codebook group, or a single CQI calculated based on any codebook in the codebook group.

Further, the sending module 53 is further configured to, after the processing module 52 performs precoding processing on the data to be sent by using the N codebooks in the codebook group to generate N encoded data, sequentially send the N encoded data to the receiving node at N consecutive times from time N.

Specifically, after the processing module 52 performs precoding processing on the data to be transmitted by using the N codebooks in the codebook group to generate N pieces of encoded data, the transmitting module 53 sequentially transmits the N pieces of encoded data to the receiving node at N consecutive times from the time N. When the receiving node receives the N encoded data, the N encoded data can be demodulated. The transmitting node uses the codebook group containing N codebooks to encode the data to be transmitted to generate N encoded data, and the codebook group containing N codebooks is transmitted to the transmitting node by the receiving node, so that the receiving node stores the codebook group, and the receiving node can demodulate the N encoded data according to the codebook group to obtain the data to be transmitted by the transmitting node.

Since the data to be transmitted sent by the sending module 53 is transmitted after being encoded by using the codebook group including the N codebooks, it is equivalent to sending the same data by different precoding weights, so that the accuracy and reliability of the data received and demodulated by the receiving node are high, and the data transmission error of the narrow beam can be greatly reduced.

Further, the receiving module 51 is further configured to, after the sending module 53 starts from time N and sequentially sends the N encoded data to the receiving node at N consecutive times, receive a correct response confirmation message sent by the receiving node at time N + N-1+ m, or receive an incorrect response confirmation message sent by the receiving node at time N + N-1+ m, where m is a preset value, and optionally, m is time for the transmitting node to receive and process the nth encoded data.

Specifically, after the sending module 53 sends the N encoded data to the receiving node sequentially at N consecutive times from time N, at this time, the receiving node should feed back to the transmitting node whether the response message is correctly received. If the channel measurement method of the codebook group is not adopted, that is, the receiving node only feeds back one codebook each time, the receiving node sends a correct Acknowledgement (ACK) message or an incorrect Acknowledgement (NACK) message to the transmitting node after a certain time after receiving the data sent by the transmitting node after being encoded according to the codebook. However, if the receiving node feeds back a codebook group including N codebooks to the transmitting node, since the transmitting module 53 encodes and transmits the same data by using the N codebooks in the codebook group, the receiving node does not feed back an ACK or NACK message for each encoded data transmitted by the transmitting node, but feeds back an ACK or NACK message to the transmitting node after receiving the N encoded data and obtaining the data to be transmitted by demodulating. That is, the receiving node feeds back only one ACK or NACK message for the data to be transmitted corresponding to one codebook group. As shown in the data transceiving timing diagram of fig. 4, it can be known that the receiving module 51 receives a correct acknowledgement message sent by the receiving node at the time N + N-1+ m, or receives an incorrect acknowledgement message sent by the receiving node at the time N + N-1+ m.

Further, the sending module 53 is further configured to, after the receiving module 51 receives the incorrect response acknowledgement message sent by the receiving node at time N + N-1+ m, retransmit the N coded data to the receiving node at time N + Rt, where t is a hybrid retransmission round-trip delay, where R ≧ 1, optionally,

specifically, after the sending module 53 sends data to the receiving node, if the receiving module 51 receives the ACK message, the sending is successful; if the receiving module 51 receives the NACK message, that is, it indicates that the transmission is failed, and if the receiving module 51 receives the NACK message, the data needs to be retransmitted. In the scheme using the single codebook, the Time for the sending module 53 to retransmit data is after sending data to the receiving node, and after a Round Trip Time (RTT) of a Hybrid Automatic Repeat reQuest (Hybrid Automatic Repeat reQuest) is separated, data is retransmitted. However, when the codebook group scheme including multiple codebooks is adopted, since the number N of codebooks in the codebook group is uncertain, in consideration of the case that the number of codebooks is large, after the receiving module 51 receives the NACK message, the sending module 53 retransmits data at the time N + Rt, where R ≧ 1, optionally, denotes rounding up, and t is the hybrid retransmission round-trip delay. The above result can be obtained by referring to the data transceiving and retransmission timing diagram shown in fig. 5.

Fig. 7 is a flowchart of a first embodiment of a channel measurement method according to an embodiment of the present invention, and as shown in fig. 7, the method of the present embodiment includes:

step S701, a receiving node acquires the number N of codebooks in a codebook group to be measured, wherein N is more than or equal to 1.

Step S702, the receiving node measures a channel to obtain a codebook group of the channel, wherein the codebook group comprises N codebooks.

Step S703, the receiving node reports the information of the codebook group to the transmitting node.

The channel measurement method provided in this embodiment is used to complete the processing of the receiving node shown in fig. 1, and the implementation principle and technical effect are similar, which are not described herein again.

Further, in the embodiment shown in fig. 7, after step S701, the method further includes: the receiving node generates M codebooks in a codebook space of the receiving node into a codebook group space composed of at least two codebook groups, wherein each codebook group in the codebook group space is composed of N codebooks.

Further, in the embodiment shown in fig. 7, a part of codebooks in at least two codebook groups in the codebook group space are the same.

Further, in the embodiment shown in fig. 7, step S703 includes: and the receiving node reports the index number of the codebook group in the codebook group space to the transmitting node.

Further, in the embodiment shown in fig. 7, step S701 includes: the receiving node receives a high-level signaling or a physical layer dedicated signaling sent by the transmitting node, wherein the high-level signaling or the physical layer dedicated signaling comprises the N, and the high-level signaling comprises an RRC signaling or an MAC layer signaling; the receiving node obtains the N from the high layer signaling or the physical layer dedicated signaling.

Further, in the embodiment shown in fig. 7, step S701 includes: the receiving node takes i codebooks as a codebook group Z_iMeasuring a channel to obtain M results, wherein i is 1,2, …, M, and M is the number of codebooks in the codebook space of the receiving node; the receiving node determines the codebook group Z with the best channel quality in the M results_iThe codebook group Z_iAnd taking the number i of the medium codebooks as the number N of the codebooks in the codebook group to be measured. After step S701, the method further includes: the jointThe receiving node sends a notification message to the transmitting node, the notification message including the N. .

Fig. 8 is a flowchart of a second embodiment of a channel measurement method according to the second embodiment of the present invention, and as shown in fig. 8, the method of the present embodiment includes:

step S801, a receiving node acquires the number N of codebooks in a codebook group to be measured, wherein N is more than or equal to 1.

Step S802, the receiving node measures a channel to obtain a codebook group of the channel, wherein the codebook group comprises N codebooks.

Step S803, the receiving node reports the information of the codebook group to the transmitting node.

Step S804, the receiving node receives the N encoded data sent by the transmitting node from time N.

Step S805, the receiving node demodulates the N encoded data to obtain the data to be transmitted.

Fig. 9 is a flowchart of a third embodiment of a channel measurement method according to the present invention, and as shown in fig. 9, the method of the present embodiment includes:

step S901, a receiving node acquires the number N of codebooks in a codebook group to be measured, where N is greater than or equal to 1.

Step S902, the receiving node measures a channel to obtain a codebook group of the channel, where the codebook group includes N codebooks.

Step S903, the receiving node reports the information of the codebook group to the transmitting node.

Step S904, the receiving node receives the N encoded data sent by the transmitting node from time N.

Step S905, the receiving node sends a correct response acknowledgement message to the transmitting node at a time N + N-1+ m, where m is a preset value, and optionally, m is a time for the transmitting node to receive and process the nth encoded data.

Step S906, the receiving node demodulates the N encoded data to obtain the data to be transmitted.

Step S907, the receiving node sends an incorrect response confirmation message to the transmitting node at the time N + N-1+ m.

Step S908, the receiving node receives the N encoded data retransmitted by the transmitting node at N + Rt, where t is hybrid retransmission round-trip delay, where R ≧ 1, optionally,

further, in the embodiments shown in fig. 7 to fig. 9, after the receiving node measures a channel to obtain information of a codebook group of the channel, the method further includes: the receiving node sends the CQI based on the codebook group to the transmitting node, wherein the CQI is an average CQI calculated based on N codebooks in the codebook group or a single CQI calculated based on any one codebook in the codebook group.

Fig. 10 is a flowchart of a fourth embodiment of a channel measurement method according to the embodiment of the present invention, as shown in fig. 10, the method of the embodiment includes:

step S1001, a transmitting node receives information of a codebook group sent by a receiving node, wherein N is more than or equal to 1.

Step S1002, the transmitting node performs precoding processing on data to be transmitted respectively by using N codebooks in the codebook group, and generates N encoded data.

The channel measurement method provided in this embodiment is used to complete the processing of the transmitting node shown in fig. 5, and the implementation principle and technical effect are similar, and are not described herein again.

Further, in the embodiment shown in fig. 10, the method further includes: the transmitting node generates M codebooks in the codebook space of the transmitting node into a codebook space composed of at least two codebook groups, wherein each codebook group in the codebook group space is composed of N codebooks.

Further, in the embodiment shown in fig. 10, a part of codebooks in at least two codebook groups in the codebook group space are the same.

Further, in the embodiment shown in fig. 10, step S1001 includes: and the transmitting node receives the index number of the codebook group in the codebook group space, which is sent by the receiving node.

Further, in the embodiment shown in fig. 10, before step S1001, the method further includes: the transmitting node sends a high-level signaling or a physical layer dedicated signaling to the receiving node, wherein the high-level signaling or the physical layer dedicated signaling comprises the N, and the high-level signaling comprises an RRC signaling or an MAC layer signaling, so that the receiving node acquires the N from the high-level signaling or the physical layer dedicated signaling.

Further, in the embodiment shown in fig. 10, before step S1001, the method includes: further comprising: and the transmitting node receives the N sent by the receiving node, wherein the N is obtained after the receiving node measures the channel.

Fig. 11 is a flowchart of a fifth embodiment of a channel measurement method according to the embodiment of the present invention, and as shown in fig. 11, the method of the embodiment includes:

step S1101, the transmitting node receives the information of the codebook group sent by the receiving node, wherein N is more than or equal to 1.

Step S1102, the transmitting node performs precoding processing on data to be transmitted respectively by using N codebooks in the codebook group, and generates N encoded data.

Step S1103, the transmitting node sequentially sends the N encoded data to the receiving node at N consecutive times from time N.

Fig. 12 is a flowchart of a sixth embodiment of a channel measurement method according to an embodiment of the present invention, and as shown in fig. 12, the method according to the embodiment includes:

step S1201, the transmitting node receives the information of the codebook group sent by the receiving node, wherein N is more than or equal to 1.

Step S1202, the transmitting node performs precoding processing on data to be transmitted respectively by using N codebooks in the codebook group, and generates N encoded data.

Step S1203, the transmitting node sequentially sends the N encoded data to the receiving node at N consecutive times from time N.

Step S1204, the transmitting node receives a correct response acknowledgement message sent by the receiving node at time N + N-1+ m, where m is a preset value, and optionally, m is time for the transmitting node to receive and process the nth encoded data.

Step S1205, the transmitting node receives the incorrect response confirmation message sent by the receiving node at the time N + N-1+ m.

Step S1206, the transmitting node retransmits the N encoded data to the receiving node at a time N + Rt, where t is a hybrid retransmission round-trip delay, where R ≧ 1, optionally,

further, in the embodiments shown in fig. 10 to fig. 12, after the transmitting node receives the codebook group sent by the receiving node, the method further includes:

and the transmitting node receives CQI which is sent by the receiving node and is based on the codebook group, wherein the CQI is an average CQI calculated based on N codebooks in the codebook group or a single CQI calculated based on any one codebook in the codebook group.

Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: it is also possible to modify the solutions described in the previous embodiments or to substitute some or all of them with equivalents. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (40)

1. A receiving node, comprising:

   the acquisition module is used for acquiring the number N of the codebooks in the codebook group to be measured, wherein N is more than or equal to 1;

   the measuring module is used for measuring a channel to obtain a codebook group of the channel, wherein the codebook group comprises N codebooks;

   and the sending module is used for reporting the information of the codebook group to a transmitting node.
2. The receiving node according to claim 1, wherein the obtaining module is further configured to, after obtaining the number N of codebooks in the codebook group to be measured, generate a codebook group space composed of at least two codebook groups from M codebooks in a codebook space of the receiving node, where each codebook group in the codebook group space is composed of N codebooks.
3. The receiving node of claim 2, wherein a portion of codebooks in at least two codebook groups in the codebook group space are identical.
4. The receiving node according to claim 2 or 3, wherein the sending module is specifically configured to report, to the transmitting node, an index number of the codebook group in the codebook group space.
5. The receiving node according to any one of claims 1 to 4, wherein the obtaining module is specifically configured to receive a high layer signaling or a physical layer dedicated signaling sent by the transmitting node, where the high layer signaling or the physical layer dedicated signaling includes the N, and the high layer signaling includes a Radio Resource Control (RRC) signaling or a Medium Access Control (MAC) layer signaling; and obtaining the N from the high layer signaling or the physical layer special signaling.
6. The receiving node according to any of claims 1 to 5, wherein the measuring module is further configured to use i codebooks as codebook groups Z_iMeasuring a channel to obtain M results, wherein i is 1,2, …, M, and M is the number of codebooks in the codebook space of the receiving node;

   the obtaining module is specifically configured to determine, from the M results, a codebook group Z with the best channel quality_iThe codebook group Z_iThe number i of the middle codebooks is used as the number N of the codebooks in the codebook group to be measured;

   the sending module is further configured to send a notification message to the transmitting node, where the notification message includes the N.
7. The receiving node according to any of claims 1 to 6, further comprising:

   a receiving module, configured to receive, from time N, the N encoded data sent by the transmitting node after the sending module reports the information of the codebook group to the transmitting node;

   and the demodulation module is used for demodulating the N coded data to obtain the data to be sent.
8. The receiving node of claim 7, wherein the sending module is further configured to send a correct acknowledgement message to the transmitting node at time N + N-1+ m after the receiving module receives the N encoded data sent by the transmitting node from time N, or send an incorrect acknowledgement message to the transmitting node at time N + N-1+ m, where m is a preset value.
9. The receiving node of claim 8, wherein the receiving module is further configured to receive the N encoded data retransmitted by the transmitting node at N + Rt after the sending module sends an incorrect response acknowledgement message to the transmitting node at N + N-1+ m, where t is a hybrid retransmission round trip delay, and R ≧ 1.
10. The receiving node according to any of claims 1 to 9, wherein the sending module is further configured to send, to the transmitting node, a channel quality indicator CQI based on a codebook group of the channel after the measuring module measures the channel to obtain the codebook group, where the CQI is an average CQI calculated based on N codebooks in the codebook group or a single CQI calculated based on any one codebook in the codebook group.
11. A transmitting node, comprising:

    the receiving module is used for receiving information of a codebook group sent by a receiving node, wherein the codebook group comprises N codebooks, and N is more than or equal to 1;

    and the processing module is used for performing precoding processing on data to be sent by using the N codebooks in the codebook group respectively to generate N coded data.
12. The transmitting node of claim 11, wherein the processing module is further configured to generate M codebooks in the codebook space of the transmitting node into a codebook space consisting of at least two codebook groups, and wherein each codebook group in the codebook group space consists of N codebooks.
13. The transmitting node of claim 12, wherein a portion of the codebooks in at least two codebook groups in the codebook group space are the same.
14. The transmitting node according to claim 12 or 13, wherein the receiving module is specifically configured to receive an index number of the codebook group in the codebook group space, which is sent by the receiving node.
15. The transmitting node according to any of claims 11 to 14, further comprising: a sending module, configured to send a high-level signaling or a physical layer dedicated signaling to a receiving node before the receiving module receives information of a codebook group sent by the receiving node, where the high-level signaling or the physical layer dedicated signaling includes N, the high-level signaling includes a Radio Resource Control (RRC) signaling or a Medium Access Control (MAC) layer signaling, and N is preset by the sending node.
16. The transmitting node according to any one of claims 11 to 14, wherein the receiving module is further configured to receive the N sent by the receiving node before receiving information of the codebook group sent by the receiving node, where the N is obtained after the receiving node measures a channel.
17. The transmitting node according to any one of claims 11 to 16, wherein the transmitting module is further configured to, after the processing module performs precoding processing on data to be transmitted by using N codebooks in the codebook group respectively to generate N encoded data, sequentially transmit the N encoded data to the receiving node at N consecutive times starting from time N.
18. The transmitting node of claim 17, wherein the receiving module is further configured to receive a correct acknowledgement message sent by the receiving node at time N + N-1+ m or an incorrect acknowledgement message sent by the receiving node at time N + N-1+ m after the transmitting module sequentially sends the N encoded data to the receiving node at N consecutive times from time N, where m is a preset value.
19. The transmitting node of claim 18, wherein the sending module is further configured to retransmit the N encoded data to the receiving node at N + Rt after the receiving module receives an incorrect acknowledgement message sent by the receiving node at N + N-1+ m, where t is a hybrid retransmission round trip delay, and R ≧ 1.
20. The transmitting node according to any of claims 11 to 19, wherein the receiving module is further configured to receive, after receiving information of a codebook group sent by a receiving node, a channel quality indicator CQI sent by the receiving node and based on the codebook group, where the CQI is an average CQI calculated based on N codebooks in the codebook group or a single CQI calculated based on any codebook in the codebook group.
21. A method of channel measurement, comprising:

    the receiving node acquires the number N of codebooks in a codebook group to be measured, wherein N is more than or equal to 1;

    the receiving node measures a channel to obtain a codebook group of the channel, wherein the codebook group comprises N codebooks;

    and the receiving node reports the information of the codebook group to the transmitting node.
22. The method according to claim 21, wherein after the receiving node obtains the number N of codebooks in the codebook group to be measured, the method further comprises:

    the receiving node generates M codebooks in a codebook space of the receiving node into a codebook group space composed of at least two codebook groups, wherein each codebook group in the codebook group space is composed of N codebooks.
23. The method of claim 22, wherein a portion of codebooks in at least two codebook groups in the codebook group space are the same.
24. The method of claim 22 or 23, wherein the reporting, by the receiving node, the information of the codebook group to the transmitting node comprises:

    and the receiving node reports the index number of the codebook group in the codebook group space to the transmitting node.
25. The method according to any of claims 21 to 24, wherein the acquiring, by the receiving node, the number N of codebooks in the codebook group corresponding to the receiving node comprises:

    the receiving node receives a high-level signaling or a physical layer dedicated signaling sent by the transmitting node, wherein the high-level signaling or the physical layer dedicated signaling comprises the N, and the high-level signaling comprises a Radio Resource Control (RRC) signaling or a Medium Access Control (MAC) layer signaling;

    the receiving node obtains the N from the high layer signaling or the physical layer dedicated signaling.
26. The method according to any of claims 21 to 25, wherein the receiving node obtains the number N of codebooks in the codebook group corresponding to the receiving node, comprising:

    the receiving node takes i codebooks as a codebook group Z_iMeasuring a channel to obtain M results, wherein i is 1,2, …, M, and M is the number of codebooks in the codebook space of the receiving node;

    the receiving node determines the codebook group Z with the best channel quality in the M results_iThe codebook group Z_iThe number i of the middle codebooks is used as the number N of the codebooks in the codebook group to be measured;

    the method further comprises the following steps:

    the receiving node sends a notification message to the transmitting node, the notification message including the N.
27. The method according to any of claims 21 to 26, wherein after the receiving node reports the information of the codebook group to the transmitting node, the method further comprises:

    the receiving node receives the N coded data sent by the transmitting node from a moment N;

    and the receiving node demodulates the N coded data to obtain the data to be sent.
28. The method of claim 27, wherein the receiving node receives the N encoded data transmitted by the transmitting node after starting from time N, further comprising:

    the receiving node sends a correct response confirmation message to the transmitting node at the moment of N + N-1+ m, wherein m is a preset value;

    or the receiving node sends an incorrect response confirmation message to the transmitting node at the moment N + N-1+ m.
29. The method of claim 28, wherein the receiving node sends the incorrect receipt acknowledgement message to the transmitting node at time N + N-1+ m, and further comprising

    And the receiving node receives the N coded data retransmitted by the transmitting node at the moment of N + Rt, wherein t is the hybrid retransmission round-trip delay, and R is more than or equal to 1.
30. The method according to any one of claims 21 to 29, wherein the receiving node measures a channel, and after obtaining the codebook group of the channel, the method further comprises:

    and the receiving node sends a Channel Quality Indicator (CQI) based on the codebook group to the transmitting node, wherein the CQI is an average CQI calculated based on N codebooks in the codebook group or a single CQI calculated based on any one codebook in the codebook group.
31. A method of channel measurement, comprising:

    the method comprises the steps that a transmitting node receives information of a codebook group sent by a receiving node, wherein the codebook group comprises N codebooks, and N is more than or equal to 1;

    and the transmitting node uses the N codebooks in the codebook group to perform precoding processing on data to be transmitted respectively to generate N coded data.
32. The method of claim 31, further comprising:

    the transmitting node generates M codebooks in the codebook space of the transmitting node into a codebook space composed of at least two codebook groups, wherein each codebook group in the codebook group space is composed of N codebooks.
33. The method of claim 32, wherein a portion of codebooks in at least two codebook groups in the codebook group space are the same.
34. The method according to claim 32 or 33, wherein the transmitting node receives the information of the codebook group sent by the receiving node, comprising:

    and the transmitting node receives the index number of the codebook group in the codebook group space, which is sent by the receiving node.
35. The method according to any of claims 31 to 34, wherein before the transmitting node receives the information of the codebook group sent by the receiving node, the method further comprises:

    the transmitting node sends a high-level signaling or a physical layer dedicated signaling to the receiving node, where the high-level signaling or the physical layer dedicated signaling includes the N, and the high-level signaling includes a Radio Resource Control (RRC) signaling or a Medium Access Control (MAC) layer signaling, so that the receiving node obtains the N from the high-level signaling or the physical layer dedicated signaling, where the N is preset by the transmitting node.
36. The method according to any of claims 31 to 34, wherein before the transmitting node receives the information of the codebook group sent by the receiving node, the method further comprises:

    and the transmitting node receives the N sent by the receiving node, wherein the N is obtained after the receiving node measures the channel.
37. The method according to any one of claims 31 to 36, wherein the transmitting node performs precoding processing on data to be transmitted by using N codebooks in the codebook group, and after generating N encoded data, the method further comprises:

    and the transmitting node sequentially transmits the N coded data to the receiving node at N continuous time moments from the time moment N.
38. The method of claim 37, wherein the transmitting node, starting at time N, after sequentially transmitting the N encoded data to the receiving node at N consecutive times, further comprises:

    the transmitting node receives a correct response confirmation message sent by the receiving node at the moment of N + N-1+ m, wherein m is a preset value;

    or the transmitting node receives an incorrect response confirmation message sent by the receiving node at the moment N + N-1+ m.
39. The method of claim 38, wherein after the transmitting node receives the incorrect acknowledgement message sent by the receiving node at time N + N-1+ m, the method further comprises:

    and the transmitting node retransmits the N coded data to the receiving node at the moment of N + Rt, wherein t is the hybrid retransmission round-trip delay, and R is more than or equal to 1.
40. The method according to any of claims 31 to 39, wherein after the transmitting node receives the information of the codebook group sent by the receiving node, the method further comprises:

    and the transmitting node receives the CQI based on the codebook group, which is sent by the receiving node, wherein the CQI is an average CQI calculated based on N codebooks in the codebook group or a single CQI calculated based on any one codebook in the codebook group.