CN109923922B

CN109923922B - Channel quality indication reporting method and related equipment

Info

Publication number: CN109923922B
Application number: CN201780068536.9A
Authority: CN
Inventors: 孙彦良; 赵毅男; 刘斌; 杨育波
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2017-08-11
Filing date: 2017-08-11
Publication date: 2021-08-31
Anticipated expiration: 2037-08-11
Also published as: CN109923922A; WO2019028907A1

Abstract

The present disclosure relates to the field of communications technologies, and in particular, to a method for reporting a channel quality indicator and a related device, where the method includes: the terminal reports a differential Channel Quality Indicator (CQI), and the differential CQI is determined based on the median and the absolute CQI of the second code word; wherein the median and the absolute CQI of the second codeword are calculated based on a network device configuration, and the network configuration includes an absolute CQI rank configuration of the first codeword and one or more of the following three: an absolute CQI rank configuration for the second codeword; a median configuration or offset value; by implementing the differential CQI grade configuration, when the downlink is a static link, namely the absolute CQI difference between the code words is large, the base station can more accurately know the absolute CQI of the code words to adjust the downlink modulation and coding mode, thereby achieving better system performance.

Description

Channel quality indication reporting method and related equipment

Technical Field

The present application relates to the field of communications technologies, and in particular, to a channel quality indication reporting method and a related device.

Background

The Multiple Input Multiple Output (MIMO) technology is a major breakthrough of the smart antenna technology in the field of wireless mobile communication, can improve the capacity and the spectrum utilization rate of a communication system by multiples without increasing the bandwidth, and is a key technology which must be adopted by a new generation of mobile communication system. In an MIMO system, a base station may adjust a downlink modulation and coding scheme by referring to a Channel Quality Indicator (CQI) of a codeword, so as to achieve better system performance, where the codeword is a codeword included in downlink data.

In general, if the downlink data includes two codewords, (a first codeword and a second codeword), the terminal may report the absolute CQI of the first codeword and the differential CQI of the second codeword, where the differential CQI of the second codeword is calculated based on the difference between the absolute CQI of the first codeword and the absolute CQI of the second codeword, as shown in the following formula. The base station can determine the absolute CQI of each code word according to the reported absolute CQI and the differential CQI, so that the downlink modulation and coding mode can be adjusted according to the determined absolute CQI of each code word.

Differential CQI for second codeword-Absolute CQI for first codeword-Absolute CQI for second codeword

However, the standard specifies that the rank definition of the absolute CQI may be a 16-rank definition table as shown in table 1, table 2, or table 3, and the rank configuration of the differential CQI may be a definition table of only 8 ranks as shown in table 4. As can be seen from table 3, the larger the calculated differential CQI is, or the larger the absolute CQI difference between two codewords is, or the larger the signal-to-noise ratio difference between two codewords is (the absolute CQI of a codeword and the signal-to-noise ratio of a codeword have a mapping relationship), the more the calculated differential CQI is mapped to the CQI number (actually reported differential CQI) in table 3 according to table 4, the less the difference condition of the codeword cannot be accurately reflected, that is, the less the absolute CQI determined by the base station according to the reported differential CQI is, so that the lower the accuracy of the base station in adjusting the downlink modulation and coding scheme according to the reported CQI is.

For example, the rank configuration of the absolute CQI is shown in table 1, the rank configuration of the differential CQI is shown in table 4, the absolute CQI calculated by referring to table 1 for the first codeword is 15, the absolute CQI calculated by referring to table 1 for the second codeword is 14, the differential CQI of the second codeword is the absolute CQI of the first codeword-the absolute CQI of the second codeword is 1, and the differential CQI that is the CQI number of the differential CQI reference table 4 for the second codeword is 1, the base station calculates the absolute CQI of the second codeword to be 14 according to the reported differential CQI (1) and the absolute CQI (15) referred to by the first codeword, and accurately reflects the absolute CQIs of the first codeword and the second codeword; however, when the absolute CQI of the second codeword is 1, the differential CQI of the second codeword is 14, which is the absolute CQI of the first codeword, and the differential CQI referred to the CQI number in table 4 of the differential CQI of the second codeword is 3, the base station calculates the absolute CQI of the second codeword to be 12 from the reported differential CQI (3) and the absolute CQI (15) referred to by the first codeword, and does not match the absolute CQI of the second codeword determined by the terminal to be 1, and the absolute CQI of the first codeword and the absolute CQI of the second codeword cannot be accurately reflected.

Therefore, at present, it is urgently needed to solve how to make the reporting of CQI better adapt to the channel environments corresponding to the current two codewords when the downlink is a static link, that is, the absolute CQI of the codewords has a large difference, so that the network device can adjust the downlink modulation and coding manner more accurately, and achieve better system performance.

Disclosure of Invention

The application provides a channel quality indication reporting method and related equipment, when a downlink is a static link, namely, the absolute CQI of a code word has a large difference, a base station can accurately know the absolute CQI of the code word to adjust the downlink modulation and coding mode, and better system performance is achieved.

In a first aspect, a method for reporting a channel quality indicator is provided, including:

the terminal reports a differential Channel Quality Indicator (CQI), and the differential CQI is determined based on the median and the absolute CQI of the second code word;

the median and the absolute CQI of the second codeword are calculated based on network device configuration, where the network configuration includes the absolute CQI level configuration of the first codeword and one or more of the following three items:

absolute CQI level configuration for a second codeword;

a median configuration or offset value;

differential CQI level configuration.

In one possible design, when the network configuration includes an absolute CQI rank configuration for a second codeword, the absolute CQI rank configuration for the second codeword is different from the absolute CQI rank configuration for the first codeword, and the calculation of the median and the second codeword absolute CQI is based on the absolute CQI rank configuration for the second codeword.

In yet another possible design, when the network configuration does not include a median configuration and a bias value, the computing of the median is based on an absolute CQI for the first codeword, where the absolute CQI for the first codeword is determined based on the absolute CQI rank configuration for the first codeword.

In yet another possible design, when the network configuration includes an absolute CQI rank configuration of the second codeword and the network configuration does not include a median configuration and an offset value, the median is a CQI rank number, in the absolute CQI rank configuration of the second codeword, that is closest to a spectral efficiency corresponding to an absolute CQI of the first codeword in the absolute CQI rank configuration of the first codeword.

In yet another possible design, when the network configuration includes a median configuration, the median takes a value of the median configuration.

In yet another possible design, when the network configuration includes an offset value, the calculation of the median value is based on a sum or a difference of an absolute CQI for the first codeword and the offset value, wherein the absolute CQI for the first codeword is determined based on the absolute CQI rank configuration for the first codeword.

In yet another possible design, when the network configuration includes an absolute CQI rank configuration of the second codeword and the network configuration includes an offset value, the median value is a CQI number of spectral efficiency corresponding to the sum or difference between the offset value in the absolute CQI rank configuration of the first codeword and the absolute CQI of the first codeword in the absolute CQI rank configuration of the second codeword.

In yet another possible design, when the network configuration does not include the absolute CQI rank configuration for the second codeword and the network configuration includes the offset value, the median value is the sum or difference of the absolute CQI for the first codeword and the offset value.

In yet another possible design, when the network configuration includes a differential CQI rank configuration, the differential CQI is a difference between the median and the second codeword absolute CQI, and is obtained based on the differential CQI rank configuration.

In yet another possible design, the terminal may also report the differential CQI through a subframe configured by the network device.

The configuration information may be configured semi-statically through a radio resource control message.

It can be seen that, when the differential CQI is calculated, the differential CQI is calculated based on a median value and an absolute CQI of a second codeword, where the median value may be configured by a network, or determined based on one or more of an absolute CQI level configuration of a first codeword and an absolute CQI level configuration of a second codeword, or an offset value, or a differential CQI level configuration, rather than being calculated directly based on an absolute CQI of the first codeword and an absolute CQI of the second codeword, and when a downlink is a static link, that is, when an absolute CQI of a codeword differs greatly, reporting of a CQI is better adapted to channel environments corresponding to two current codewords, respectively, by means of the network configuration, so that a network device adjusts a downlink modulation and coding scheme more accurately, and achieves better system performance.

In a second aspect, another method for reporting a channel quality indicator is provided, including:

the network equipment sends configuration information, wherein the configuration information comprises that the absolute CQI grade of the first code word configures one or more of the following three items:

absolute CQI level configuration for a second codeword;

a median configuration or offset value;

differential CQI level configuration.

Wherein the absolute CQI level configuration for the first codeword and the absolute CQI level configuration for the second codeword may be different. The configuration information is further used for configuring a subframe used by the terminal to report the differential CQI, wherein the differential CQI is determined based on the configuration information.

In a third aspect, another method for reporting a channel quality indicator is provided, including:

the network equipment sends configuration information to the terminal, wherein the configuration information can comprise a median configuration and an absolute CQI level configuration of a second code word;

and the terminal reports the differential CQI of the second code word, the differential CQI of the second code word is determined based on the median and the absolute CQI of the second code word, wherein the median is a value configured by the median, and the absolute CQI of the second code word is determined based on the absolute CQI grade configuration of the second code word.

In a fourth aspect, a terminal is provided, where the terminal includes a module or a unit configured to perform the method for reporting a channel quality indicator according to the first aspect.

In a fifth aspect, a network device is provided, where the network device includes a module or a unit configured to perform the channel quality indication reporting according to the second aspect.

In a sixth aspect, there is provided yet another terminal comprising a processor, a communication module, and a memory for storing instructions. The processor is configured to read an instruction of the memory to execute the method for reporting a channel quality indicator according to the first aspect.

In a seventh aspect, a network device is provided that includes a processor, a communication module, and a memory for storing instructions. The processor is configured to read the instruction of the memory to execute the method for reporting the cqi of the second aspect.

In an eighth aspect, a computer storage medium is provided for storing computer software instructions for the terminal, which includes a program designed to execute the first aspect.

In a ninth aspect, there is provided a computer storage medium for storing computer software instructions for the network device, which includes a program designed to execute the second aspect.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings used in the description of the embodiments will be briefly introduced below.

Fig. 1 is a schematic architecture diagram of a communication system according to an embodiment of the present application;

fig. 2A is a schematic flowchart of a differential CQI reporting method according to an embodiment of the present application;

fig. 2B is a schematic flowchart of another differential CQI reporting method according to an embodiment of the present application;

fig. 2C is a schematic flowchart of another differential CQI reporting method according to an embodiment of the present application;

fig. 2D is a schematic flowchart of another differential CQI reporting method according to an embodiment of the present application;

fig. 3 is a subframe set of subframes for reporting a differential CQI by a terminal according to an embodiment of the present disclosure;

fig. 4 is a schematic structural diagram of a terminal according to an embodiment of the present application;

fig. 5 is a schematic structural diagram of a network device according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of another terminal provided in the embodiment of the present application;

fig. 7 is a schematic structural diagram of another network device according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.

Referring to fig. 1, which is a schematic structural diagram of a communication system according to an embodiment of the present disclosure, the communication system 100 includes a network device 101 and a terminal 102, and the network device 101 and the terminal 102 communicate over an air interface. Wherein:

the network device 101 may be a network device in a New Radio technology (NR), or may be a base station (NodeB, NB) in a 3G (such as a Universal Mobile Telecommunications System (UMTS), Wideband Code Division Multiple Access (WCDMA), Time Division-Synchronous Code Division Multiple Access (TD-SCDMA)) System, or may be an evolved base station (evolved Node B, eNB) in a Long Term Evolution (Long Term Evolution, LTE) System.

A terminal 102 can be referred to as a user equipment such as a mobile station, access terminal, subscriber unit, subscriber station, mobile station, remote terminal, mobile device, user terminal, wireless communication device, user agent, or user device. The terminal 102 may also be a cellular phone, a Personal Digital Assistant (PDA), a handheld device with wireless communication capability, a vehicle-mounted device, a wearable device, and a Mobile station in a future 5G Network or a terminal device in a future evolved Public Land Mobile Network (PLMN) Network, etc.

In an application scenario of the present application, the network device 101 may send a Reference Signal (CSI-RS) and/or a Synchronization Signal (SS) for measuring a Channel State to the terminal 102 in a multi-code space division multiplexing manner. The terminal 102 measures the reference signal CSI-RS and/or the synchronization signal SS, calculates a CQI for each codeword, and reports the CQI, so that when the downlink is a static link, that is, the absolute CQI of the codeword has a large difference, the base station can more accurately know the absolute CQI of the codeword to adjust the downlink modulation and coding scheme, thereby achieving better system performance.

The first embodiment is as follows:

referring to fig. 2A, it is a schematic flow chart of another differential CQI reporting method provided in the present application, and as shown in fig. 2A, the method may include:

s201a, the network device sends configuration information to the terminal, and the terminal receives the configuration information sent by the network device, where the configuration information may include a median configuration and an absolute CQI level configuration of the first codeword.

S202b, the terminal reports the differential CQI of the second codeword, which is determined based on the median and the absolute CQI of the second codeword.

It should be noted that, in the embodiment of the present application, whether the configuration information may further include the absolute CQI level configuration of the second codeword is described in two cases. The absolute CQI level configuration of the first codeword and the absolute CQI level configuration of the second codeword may be defined tables for calculating an absolute CQI of the first codeword and an absolute CQI reference of the second codeword, respectively, and selecting a CQI number.

The first condition is as follows: the configuration information does not include an absolute CQI level configuration for the second codeword.

The terminal may calculate and report an absolute CQI for the first codeword based on the absolute CQI rank configuration for the first codeword. For the second codeword, in calculating the absolute CQI for the second codeword, the same absolute CQI rank configuration may be calculated based on the absolute CQI for the first codeword, i.e., the absolute CQI rank configuration for the first codeword. The differential CQI for the second codeword may be the difference between the median value (i.e., the median configuration) and the absolute CQI for the second codeword.

For example, the absolute CQI level for the first codeword is configured as table 1. The first codeword may refer to table 1 to select (based on the signal-to-noise ratio of the first codeword, which is not described herein) the CQI sequence number as the absolute CQI of the first codeword and report the absolute CQI, and the second codeword may also calculate the absolute CQI of the second codeword based on the absolute CQI rank configuration that is the same as the absolute CQI calculation of the first codeword, that is, table 1. If the median configured by the network device is 8 and the absolute CQI of the second codeword calculated based on table 1 is 10, the differential CQI of the second codeword is the median-the absolute CQI of the second codeword is 8-10-2.

Table 1 absolute CQI rank definition 1

As another example, the absolute CQI level for the first codeword is configured as table 2. The first codeword may refer to table 2 to select (based on the signal-to-noise ratio of the first codeword, which is not described herein) the CQI sequence number as the absolute CQI of the first codeword and report the absolute CQI, and the second codeword may also calculate the absolute CQI of the second codeword based on the absolute CQI rank configuration that is the same as the absolute CQI calculation of the first codeword, that is, table 2. If the median configured by the network device is 8 and the absolute CQI of the second codeword calculated based on table 2 is 10, the differential CQI of the second codeword is the median-the absolute CQI of the second codeword is 8-10-2.

Table 2 absolute CQI rank definition 2

Case two: the configuration information includes an absolute CQI level configuration for the second codeword.

The terminal may calculate and report an absolute CQI for the first codeword based on the absolute CQI rank configuration for the first codeword. An absolute CQI for the second codeword may be calculated based on the absolute CQI rank configuration for the second codeword. The differential CQI for the second codeword may be the difference between the median value (i.e., the median configuration) and the absolute CQI for the second codeword.

For example, the absolute CQI level for the first codeword is configured as table 1. The first codeword may refer to table 1, select a CQI sequence number as an absolute CQI of the first codeword, and report the CQI. The absolute CQI level for the second codeword is configured as table 3. The second codeword may choose the CQI rank as the absolute CQI for the second codeword with reference to table 3. If the median configured by the network device is 8 and the absolute CQI of the second codeword calculated based on table 3 is 8, the differential CQI of the second codeword is the median-the absolute CQI of the second codeword is 8-0.

Table 3 absolute CQI rank definition 3

It should be noted that the differential CQI of the second codeword calculated in the embodiment of the present application is not the differential CQI actually reported by the terminal. In practice, after calculating the differential CQI, the terminal may further query a CQI number corresponding to the calculated differential CQI from a differential CQI level definition, and report the queried CQI number to the network device as the differential CQI, where the differential CQI level definition may be default in the system or configured by the network device.

Specifically, if the network device sends the configuration information to the terminal without including the differential CQI rank configuration, the terminal may query the CQI sequence number corresponding to the calculated differential CQI from the differential CQI rank definition default by the system, and report the queried CQI sequence number as the differential CQI to the network device. If the network device sends the configuration information to the terminal, the terminal may determine the differential CQI rank definition from the differential CQI rank configuration configured by the network device, query the CQI sequence number corresponding to the calculated differential CQI, and report the queried CQI sequence number as the differential CQI to the network device.

For example, the default differential CQI level definition of the system may be as shown in table 4, and if the network device sends the configuration information to the terminal and does not include the differential CQI level configuration, the terminal may query the CQI sequence number corresponding to the calculated differential CQI from table 4, and report the queried CQI sequence number as the differential CQI to the network device. That is, if the calculated differential CQI of the second codeword is-2, the terminal may query the CQI number 6 corresponding to the calculated differential CQI from table 4, and report the queried CQI number 6 as the differential CQI of the second codeword to the network device.

For another example, if the network device sends the configuration information to the terminal, where the configuration information includes differential CQI rank configuration, and the configured differential CQI rank is defined as table 5, the terminal may query the CQI sequence number corresponding to the calculated differential CQI from table 5 configured by the network device, and report the queried CQI sequence number as a differential CQI to the network device. That is, if the calculated differential CQI of the second codeword is-2, the terminal may query the CQI number 6 corresponding to the calculated differential CQI from table 5, and report the queried CQI number 6 as the differential CQI of the second codeword to the network device.

For another example, if the network device sends the configuration information to the terminal, where the configuration information includes differential CQI level configuration, and the configured differential CQI level is defined as table 6, the terminal may query the CQI sequence number corresponding to the calculated differential CQI from table 6 configured by the network device, and report the queried CQI sequence number as the differential CQI to the network device. That is, if the calculated differential CQI of the second codeword is-2, the terminal may query the CQI number 6 corresponding to the calculated differential CQI from the table 6, and report the queried CQI number 6 as the differential CQI of the second codeword to the network device.

Table 4 differential CQI rank definition 1 (system default)

CQI sequence number	Offset calculation value
		0	0
1	1
		2	2
3	≥3
		4	≤-4
5	-3
		6	-2
7	-1

Table 5 differential CQI rank definition 2

CQI sequence number	Offset calculation value
		0	0
1	1
		2	2
3	3
		4	4
5	≥5
		6	≤-2
7	-1

Table 6 differential CQI rank definition 3

Optionally, the configuration information may also configure a subframe used for the terminal to report the differential CQI, so that the terminal reports the differential CQI through the configured subframe. For example, fig. 3 is a subframe set of subframes for reporting a differential CQI by the terminal, as shown in fig. 3, the subframe set includes subframes CSISubframeSet _1 and CSISubframeSet _2, and when the configuration information indicates that CSISubframeSet _1 is a subframe for reporting a differential CQI, the terminal may report a differential CQI through the CSISubframeSet _1 shown in fig. 3; when the configuration information indicates that the csi mbubframeset _2 is a subframe for reporting the differential CQI, the terminal may report the differential CQI through the csi mbubframeset _2 shown in fig. 3.

It should be noted that, in this embodiment of the present application, the configuration information may be semi-statically configured through a Radio Resource Control (RRC) message.

It can be seen that, when the differential CQI is calculated, the differential CQI is calculated based on a median and an absolute CQI of a second codeword, where the median and the absolute CQI of the second codeword are determined based on a median configuration configured by the network device and an absolute CQI rank configuration of the first codeword or an absolute CQI rank configuration of the second codeword, but are not calculated directly based on an absolute CQI of the first codeword and an absolute CQI of the second codeword, and when a downlink is a static link, that is, the absolute CQIs of the codewords have a large difference, reporting of the CQI is better adapted to channel environments corresponding to the current two codewords, respectively, by means of the network configuration, so that the network device can adjust downlink modulation and coding modes more accurately, and achieve better system performance.

Example two:

referring to fig. 2B, a schematic flow chart of another differential CQI reporting method provided in the present application is shown, and as shown in fig. 2B, the method may include:

s201c, the network device sends configuration information to the terminal, and the terminal receives the configuration information sent by the network device, where the configuration information may include an offset value and an absolute CQI level configuration of the first codeword.

S202d, the terminal reports the differential CQI of the second codeword, which is determined based on the median and the absolute CQI of the second codeword.

The terminal may calculate and report an absolute CQI for the first codeword based on the absolute CQI rank configuration for the first codeword. For the second codeword, the differential CQI of the second codeword may be a difference between a median and an absolute CQI of the second codeword, where the median may be the offset plus the absolute CQI of the first codeword, so the differential CQI of the second codeword may be represented by the following formula.

Differential CQI for the second codeword ═ Absolute CQI + offset value for the first codeword-Absolute CQI for the second codeword

Optionally, for the second codeword, the differential CQI of the second codeword may be a difference between a median value and an absolute CQI of the second codeword, where the median value may be obtained by subtracting the offset value from the absolute CQI of the first codeword, so the differential CQI of the second codeword may be represented by the following formula, and when the absolute CQI of the second codeword is calculated, the same absolute CQI level configuration as that of the absolute CQI of the first codeword, that is, the absolute CQI level configuration of the first codeword, may also be calculated based on the absolute CQI of the first codeword.

Differential CQI for the second codeword ═ Absolute CQI-offset value for the first codeword-Absolute CQI for the second codeword

For example, the absolute CQI level of the first codeword is configured as table 1, the absolute CQI of the first codeword calculated by the first codeword with reference to table 1 is 10, the absolute CQI of the second codeword calculated by the second codeword also based on table 1 is 10, and the offset value configured by the network device is 5, and then the differential CQI of the second codeword is offset value + the absolute CQI of the first codeword-the absolute CQI of the second codeword is 5+ 10-5.

The terminal may calculate and report an absolute CQI for the first codeword based on the absolute CQI rank configuration for the first codeword. For the second codeword, the differential CQI of the second codeword may be a difference between a median value and an absolute CQI of the second codeword, where the median value may be a CQI number of spectral efficiency in the absolute CQI rank configuration of the second codeword, which is closest to (including equal to) the sum of the offset value and the absolute CQI of the first codeword in the absolute CQI rank configuration of the first codeword, and the absolute CQI of the second codeword may be calculated based on the absolute CQI rank configuration of the second codeword.

For example, the absolute CQI level of the first codeword is configured as table 1, and the first codeword may refer to table 1 to select a CQI sequence number as the absolute CQI of the first codeword and report the absolute CQI. The absolute CQI rank of the second codeword is configured as table 2, and the median may be a CQI number closest (including equal) to the spectral efficiency corresponding to the sum of the offset value and the absolute CQI of the first codeword in table 1 in table 2, that is, if the offset value configured by the network device is 5, the absolute CQI of the first codeword calculated based on table 1 is 10, and the sum of the offset value and the absolute CQI of the first codeword 10+5 ═ 15 corresponds to a spectral efficiency of 5.5547 in table 1, the median may be a CQI number 12 corresponding to a spectral efficiency 5.5547 closest (or equal) to spectral efficiency 5.5547 in table 2; the absolute CQI for the second codeword may be calculated 10 based on table 2, and the differential CQI for the second codeword may be the difference between the median value and the absolute CQI for the second codeword, i.e., the differential CQI for the second codeword is the median value-the absolute CQI for the second codeword is 12-10-2.

For another example, the absolute CQI level of the first codeword is configured as table 1, and the first codeword may refer to table 1 to select a CQI sequence number as the absolute CQI of the first codeword and report the absolute CQI. The absolute CQI level of the second codeword is configured as table 3, and the median may be a CQI number closest (including equal) to the spectral efficiency corresponding to the sum of the offset value and the absolute CQI of the first codeword in table 3, that is, if the offset value configured by the network device is 5, the absolute CQI of the first codeword calculated based on table 1 is 10, and the sum of the offset value and the absolute CQI of the first codeword 10+5 ═ 15 corresponds to a spectral efficiency of 5.5547 in table 1, then the median may be a CQI number 8 corresponding to a spectral efficiency 5.5547 closest in table 3; the absolute CQI for the second codeword may be calculated 8 based on table 3, and the differential CQI for the second codeword may be the difference between the median value and the absolute CQI for the second codeword, i.e., the differential CQI for the second codeword is the median value-the absolute CQI for the second codeword is 8-8 is 0.

Optionally, for the second codeword, the differential CQI of the second codeword may be a difference between a median value and an absolute CQI of the second codeword, where the median value may be a CQI number of a spectral efficiency corresponding to a difference between the offset value and the absolute CQI of the first codeword in the absolute CQI rank configuration of the second codeword, and the absolute CQI of the second codeword may be calculated based on the absolute CQI rank configuration of the second codeword.

For example, the absolute CQI level of the first codeword is configured as table 1, and the first codeword may refer to table 1 to select a CQI sequence number as the absolute CQI of the first codeword and report the absolute CQI. The absolute CQI rank of the second codeword is configured as table 2, and the median may be a CQI number closest to (including equal to) the spectral efficiency corresponding to the difference between the offset value and the absolute CQI of the first codeword in table 1 in table 2, that is, if the offset value configured by the network device is 5, the absolute CQI of the first codeword calculated based on table 1 is 10, and the difference between the offset value and the absolute CQI of the first codeword 10-5 ═ 5 corresponds to a spectral efficiency of 0.8770 in table 1, the median may be a CQI number 3 corresponding to a spectral efficiency of 0.8770 that is closest to (or equal to) the spectral efficiency of 0.8770 in table 2; the absolute CQI for the second codeword may be calculated 10 based on table 2, and the differential CQI for the second codeword may be the difference between the median value and the absolute CQI for the second codeword, i.e., the differential CQI for the second codeword is the median value-the absolute CQI for the second codeword is 3-10-7.

It can be understood that, in the same embodiment as the first embodiment, the differential CQI of the second codeword calculated in the embodiment of the present application is not the differential CQI actually reported by the terminal. In practice, after calculating the differential CQI, the terminal may further query a CQI number corresponding to the calculated differential CQI from a differential CQI level definition, and report the queried CQI number to the network device as the differential CQI, where the differential CQI level definition may be default in the system or configured by the network device.

For another example, if the network device sends the configuration information to the terminal, where the configuration information includes differential CQI rank configuration, and the configured differential CQI rank is defined as table 5, the terminal may query the CQI sequence number corresponding to the calculated differential CQI from table 5 configured by the network device, and report the queried CQI sequence number as a differential CQI to the network device. That is, if the calculated differential CQI of the second codeword is 0, the terminal may query the CQI number 0 corresponding to the calculated differential CQI from table 5, and report the queried CQI number 0 as the differential CQI of the second codeword to the network device.

It can be understood that, in the first embodiment, the configuration information may also be used to configure a subframe used by the terminal to report the differential CQI, so that the terminal reports the differential CQI through the configured subframe, which is not described herein again.

It can be seen that, when the differential CQI is calculated, the differential CQI is calculated based on a median and an absolute CQI of a second codeword, where the median and the absolute CQI of the second codeword are determined based on an offset value configured by the network device and an absolute CQI rank configuration of the first codeword or an absolute CQI rank configuration of the second codeword, but are not calculated based directly on the absolute CQI of the first codeword and the absolute CQI of the second codeword, and when a downlink is a static link, that is, the absolute CQIs of the codewords have a large difference, the reporting of the CQI is better adapted to channel environments corresponding to the current two codewords, so that the network device can adjust downlink modulation and coding modes more accurately, and better system performance is achieved.

Example three:

referring to fig. 2C, it is a schematic flow chart of another differential CQI reporting method provided in the present application, and as shown in fig. 2C, the method may include:

s201e, the network device sends configuration information to the terminal, and the terminal receives the configuration information sent by the network device, where the configuration information may include an absolute CQI level configuration of the first codeword and an absolute CQI level configuration of the second codeword.

S202f, the terminal reports the differential CQI of the second codeword, which is determined based on the median and the absolute CQI of the second codeword.

In this embodiment of the present application, the absolute CQI level configuration of the first codeword and the absolute CQI level configuration of the second codeword may be defined tables for calculating an absolute CQI of the first codeword and an absolute CQI of the second codeword, and selecting a CQI number.

The terminal may calculate and report an absolute CQI for the first codeword based on the absolute CQI rank configuration for the first codeword. For the second codeword, the differential CQI of the second codeword may be a difference between a median value and an absolute CQI of the second codeword, where the median value may be a CQI sequence number of a spectral efficiency corresponding to the absolute CQI of the first codeword in the absolute CQI rank configuration of the second codeword, and the absolute CQI of the second codeword may be calculated based on the absolute CQI rank configuration of the second codeword.

It should be noted that, in the embodiment of the present application, the absolute CQI level configuration of the first codeword and the absolute CQI level configuration of the second codeword are different.

For example, the absolute CQI level of the first codeword is configured as table 1, and the first codeword may refer to table 1 to select a CQI sequence number as the absolute CQI of the first codeword and report the absolute CQI. The absolute CQI level of the second codeword is configured as table 2, the median may be the CQI number closest to (including equal to) the spectral efficiency corresponding to the absolute CQI of the first codeword in table 1 in table 2, that is, if the absolute CQI of the first codeword calculated based on table 1 is 10 and the absolute CQI of the first codeword corresponds to 2.7305 in table 1, the median may be the CQI number 7 corresponding to the spectral efficiency closest to (or equal to) the spectral efficiency 2.7305 in table 2; the absolute CQI for the second codeword may be calculated 10 based on table 2, and the differential CQI for the second codeword may be the difference between the median value and the absolute CQI for the second codeword, i.e., the differential CQI for the second codeword is the median value-the absolute CQI for the second codeword is 7-10-3.

For another example, the absolute CQI level of the first codeword is configured as table 1, and the first codeword may refer to table 1 to select a CQI sequence number as the absolute CQI of the first codeword and report the absolute CQI. The absolute CQI level of the second codeword is configured as table 3, and the median may be the CQI number closest (including equal) to the spectral efficiency corresponding to the sum of the offset value and the absolute CQI of the first codeword in table 3 in table 1, that is, if the absolute CQI of the first codeword calculated based on table 1 is 10 and the absolute CQI of the first codeword corresponds to a spectral efficiency of 2.7305 in table 1, the median may be the CQI number 5 corresponding to a spectral efficiency of 2.7305 that is closest in table 3; the absolute CQI for the second codeword may be calculated 8 based on table 3, and the differential CQI for the second codeword may be the difference between the median value and the absolute CQI for the second codeword, i.e., the differential CQI for the second codeword is the median value-the absolute CQI for the second codeword is 5-8-3.

It can be understood that, in the same embodiment as the first embodiment, the differential CQI of the second codeword calculated in the embodiment of the present application is not the differential CQI actually reported by the terminal. In practice, after calculating the differential CQI, the terminal may further query a CQI number corresponding to the calculated differential CQI from a differential CQI rank configuration, and report the queried CQI number to the network device as the differential CQI, where the differential CQI rank configuration may be a system default or a network device configuration.

Specifically, if the network device sends the configuration information to the terminal without including the differential CQI rank configuration, the terminal may query the CQI number corresponding to the calculated differential CQI from the system-default differential CQI rank configuration, and report the queried CQI number as the differential CQI to the network device. If the network device sends the configuration information to the terminal, the terminal may query the CQI sequence number corresponding to the calculated differential CQI from the differential CQI level configuration configured by the network device, and report the queried CQI sequence number as a differential CQI to the network device.

For example, the default differential CQI level configuration of the system may be as shown in table 4, and if the network device sends the configuration information to the terminal and does not include the differential CQI level configuration, the terminal may query the CQI sequence number corresponding to the calculated differential CQI from table 4, and report the queried CQI sequence number as the differential CQI to the network device. That is, if the calculated differential CQI of the second codeword is-3, the terminal may query the CQI number 5 corresponding to the calculated differential CQI from table 4, and report the queried CQI number 5 as the differential CQI of the second codeword to the network device.

For another example, if the network device sends the configuration information to the terminal, where the configuration information includes differential CQI rank configuration, and the configured differential CQI rank configuration is shown in table 5, the terminal may query the CQI sequence number corresponding to the calculated differential CQI from table 5 configured by the network device, and report the queried CQI sequence number as a differential CQI to the network device. That is, if the calculated differential CQI of the second codeword is-3, the terminal may query the CQI number 6 corresponding to the calculated differential CQI from table 5, and report the queried CQI number 6 as the differential CQI of the second codeword to the network device.

It can be seen that, when calculating the differential CQI, the present application calculates based on the median and the absolute CQI of the second codeword, where the median and the absolute CQI of the second codeword are determined based on the absolute CQI rank configuration of the first codeword and the absolute CQI rank configuration of the second codeword configured by the network device, rather than being calculated directly based on the absolute CQI of the first codeword and the absolute CQI of the second codeword, and when a downlink is a static link, that is, when the absolute CQI of a codeword has a large difference, the reporting of the CQI is better adapted to channel environments corresponding to the current two codewords, so that the network device more accurately adjusts the downlink modulation and coding mode, and achieves better system performance.

Example four:

as can be seen from the first embodiment, if only the differential CQI of the second codeword is calculated, as shown in fig. 2D, a flowchart of another differential CQI reporting method may execute the following steps:

s201g, the network device sends configuration information to the terminal, and the terminal receives the configuration information sent by the network device, where the configuration information may include a median configuration and an absolute CQI level configuration of the second codeword.

S202h, the terminal reports the differential CQI of the second codeword, which is determined based on the median and the absolute CQI of the second codeword.

The absolute CQI level configuration for the second codeword may be a definition table for calculating an absolute CQI reference for the second codeword and selecting a CQI rank.

As with embodiment one, the absolute CQI for the second codeword may be calculated based on the absolute CQI rank configuration for the second codeword. The differential CQI for the second codeword may be the difference between the median configuration and the absolute CQI for the second codeword. For details, see the description related to the first embodiment, and are not described herein again.

By implementing the embodiment of the application, when the downlink is a static link, that is, the absolute CQI of the codeword has a large difference, the reporting of the CQI can be better adapted to the channel environments corresponding to the two current codewords by means of the network configuration when the downlink is a static link, that is, the absolute CQI of the codeword has a large difference, so that the network device can more accurately adjust the downlink modulation and coding modes, and achieve better system performance.

It should be noted that, the absolute CQI definition tables in table 1, table 2, and table 3 can be used as definition tables for referencing and selecting CQI serial numbers when calculating absolute CQIs for the first codeword and the second codeword, but in the different embodiments, the definition tables for referencing and selecting CQI serial numbers when calculating CQIs for the first codeword, that is, the absolute CQI rank configuration of the first codeword, can be obtained according to the system configuration; or, taking the table 2 as a definition table for reference and selecting the CQI sequence number when calculating the CQI for the first codeword, that is, the absolute CQI level configuration of the first codeword; or, taking table 3 as the second codeword to calculate the CQI, and selecting a definition table of CQI numbers, that is, the absolute CQI level configuration of the second codeword. It is further understood that, in the embodiment of the present application, the absolute CQI level configuration of the first codeword and the absolute CQI level configuration of the second codeword may also define tables for other absolute CQIs besides table 1, table 2, and table 3, which is not limited herein. It is further understood that tables 4, 5, and 6 of differential CQI definition are disclosed in the present application as examples, and the differential CQI definition tables may be other differential CQI definition tables besides tables 4, 5, and 6, which are not limited herein.

In addition, in the embodiment of the present application, the description is mainly given for reporting the absolute CQI of the first codeword and the differential CQI of the second codeword by the terminal, and it can be understood by those skilled in the art that the terminal may also report the absolute CQI of the second codeword and the differential CQI of the first codeword, where the absolute CQI of the second codeword and the differential CQI of the first codeword may refer to the description of the absolute CQI of the first codeword and the differential CQI of the second codeword in the embodiment of the present application, and also belong to the protection scope of the present application, and are not described herein again.

Based on the same technical concept of the method embodiments, the embodiments of the present application further provide a terminal, which can be applied to the method embodiments.

As shown in fig. 4, a schematic structural diagram of a terminal provided in an embodiment of the present application may include:

a sending unit 401, configured to report a differential channel quality indicator CQI, where the differential CQI is determined based on the median and an absolute CQI of the second codeword;

absolute CQI level configuration for a second codeword;

a median configuration or offset value;

differential CQI level configuration.

Optionally, when the network configuration includes an absolute CQI rank configuration of the second codeword, the absolute CQI rank configuration of the second codeword is different from the absolute CQI rank configuration of the first codeword, and the calculation of the median value and the absolute CQI of the second codeword is based on the absolute CQI rank configuration of the second codeword.

Optionally, when the network configuration does not include the median configuration and the offset value, the calculation of the median is based on the absolute CQI of the first codeword, where the absolute CQI of the first codeword is determined based on the absolute CQI rank configuration of the first codeword.

Optionally, when the network configuration includes the absolute CQI level configuration of the second codeword and the network configuration does not include the median configuration and the offset value, the median is the CQI sequence number closest to the spectral efficiency corresponding to the absolute CQI of the first codeword in the absolute CQI level configuration of the second codeword.

Optionally, when the network configuration includes a median configuration, the median takes the value of the median configuration.

Optionally, when the network configuration includes an offset value, the calculation of the median value is based on a sum or a difference of the absolute CQI of the first codeword and the offset value, wherein the absolute CQI of the first codeword is determined based on the absolute CQI rank configuration of the first codeword.

Optionally, when the network configuration includes the absolute CQI level configuration of the second codeword and the network configuration includes the offset value, the median is the CQI number of the spectral efficiency corresponding to the sum or difference between the offset value in the absolute CQI level configuration of the first codeword and the absolute CQI of the first codeword in the absolute CQI level configuration of the second codeword.

Optionally, when the network configuration does not include the absolute CQI level configuration of the second codeword, and the network configuration includes the offset value, the median value is the sum or difference of the absolute CQI of the first codeword and the offset value.

Optionally, when the network configuration includes differential CQI level configuration, the differential CQI is a difference between a median and a second codeword absolute CQI, and is obtained on the basis of the differential CQI level configuration.

Optionally, the sending unit 401 is specifically configured to report the differential CQI through a subframe configured by the network device.

Alternatively, the configuration information may be configured semi-statically through radio resource control messages.

In this embodiment, reference may be made to the description related to the first to fourth embodiments, which are not repeated herein.

By implementing the embodiment of the application, when the downlink is a static link, that is, the absolute CQI of the code word has a large difference, the reporting of the CQI is better adapted to the channel environments corresponding to the two current code words respectively by means of the network configuration, so that the network equipment can more accurately adjust the downlink modulation and coding modes, and better system performance is achieved.

Based on the same technical concept of the method embodiments, the embodiments of the present application further provide a network device, which can be applied to the method embodiments.

As shown in fig. 5, a schematic structural diagram of a network device provided in an embodiment of the present application may include:

a sending unit 501, configured to send configuration information, where the configuration information includes an absolute CQI level of the first codeword configuring one or more of the following three items:

absolute CQI level configuration for a second codeword;

a median configuration or offset value;

differential CQI level configuration.

Optionally, the absolute CQI level configuration of the first codeword and the absolute CQI level configuration of the second codeword are different.

Optionally, the configuration information is used to configure a subframe used by the terminal to report the differential CQI, where the differential CQI is determined based on the configuration information.

Fig. 6 is a schematic structural diagram of another terminal provided in an embodiment of the present application, where the terminal includes a processor 601, a memory 602, and a communication module 603.

The memory 602 includes, but is not limited to, a Random Access Memory (RAM), a read-only memory (ROM), or an erasable programmable read-only memory (EPROM), and the memory 602 is used for storing related program codes and related data.

The processor 601 may be one or more Central Processing Units (CPUs), and in the case that the processor 601 is one CPU, the CPU may be a single-core CPU or a multi-core CPU.

In one possible implementation, the processor 601 in the terminal reads the program code stored in the memory 602 to perform the following operations:

reporting a differential Channel Quality Indication (CQI) through a communication module 603, wherein the differential CQI is determined based on the median and an absolute CQI of a second codeword;

absolute CQI level configuration for a second codeword;

a median configuration or offset value;

differential CQI level configuration.

Further, the communication module 603 may also report the differential CQI through a subframe configured by the network device.

The configuration information may be semi-statically configured through radio resource control messages.

Fig. 7 is a schematic structural diagram of another network device provided in an embodiment of the present application, where the network device includes a processor 701, a memory 702, and a communication module 703.

The memory 702 includes, but is not limited to, RAM, ROM, or EPROM, and the memory 702 is used to store associated program code and associated data.

The processor 701 may be one or more CPUs, and in the case where the processor 701 is one CPU, the CPU may be a single-core CPU or a multi-core CPU.

In a first possible implementation, the processor 701 in the control device reads the program code stored in the memory 702 to perform the following operations:

sending, by the communication module 703, configuration information that includes an absolute CQI level of the first codeword configuring one or more of the following three items:

absolute CQI level configuration for a second codeword;

a median configuration or offset value;

differential CQI level configuration.

Optionally, the absolute CQI level configuration for the first codeword and the absolute CQI level configuration for the second codeword may be different.

The configuration information is used for configuring a subframe used by the terminal for reporting the differential CQI, wherein the differential CQI is determined based on the configuration information.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.

The above-described software functional portions may be stored in the storage unit. The storage unit includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) or a processor (processor) to perform some steps of the methods described in the embodiments of the present application. The memory cell includes: one or more memories such as Read-Only Memory (ROM), Random Access Memory (RAM), electrically erasable programmable Read-Only Memory (EEPROM), and the like. The storage unit may be separate or integrated with the processor.

It is obvious to those skilled in the art that, for convenience and simplicity of description, the foregoing division of the functional modules is merely used as an example, and in practical applications, the above function distribution may be performed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to perform all or part of the above described functions. For the specific working process of the device described above, reference may be made to the corresponding process in the foregoing method embodiment, which is not described herein again.

Those of ordinary skill in the art will understand that: the various numerical designations of first, second, etc. referred to herein are merely used for descriptive purposes and are not intended to limit the scope of the embodiments of the present application.

It should be understood by those of ordinary skill in the art that, in the various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of the processes should be determined by their functions and inherent logic, and should not limit the implementation process of the embodiments of the present application.

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the invention to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website site, computer, server, or data center to another website site, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for reporting a Channel Quality Indicator (CQI), comprising:

wherein the median and the absolute CQI of the second codeword are calculated based on a network device configuration, and the network configuration includes an absolute CQI rank configuration of the first codeword and one or more of:

an absolute CQI rank configuration for the second codeword;

a median configuration or a bias value.

2. The method of claim 1, wherein when the network configuration comprises an absolute CQI level configuration for the second codeword, the absolute CQI level configuration for the second codeword is different from the absolute CQI level configuration for the first codeword, and wherein the calculating of the median value and the absolute CQI for the second codeword is based on the absolute CQI level configuration for the second codeword.

3. The method of claim 1, wherein when the network configuration does not include the median configuration and the bias value, the computing of the median is based on an absolute CQI for a first codeword, wherein the absolute CQI for the first codeword is determined based on an absolute CQI rank configuration for the first codeword.

4. The method of claim 2 or 3, wherein when the network configuration comprises the absolute CQI ranking configuration of the second codeword and the network configuration does not comprise the median configuration and the offset value, the median is the CQI order number closest to the spectral efficiency corresponding to the absolute CQI of the first codeword in the absolute CQI ranking configuration of the second codeword.

5. The method of claim 1, wherein when the network configuration comprises the median configuration, the median takes a value of the median configuration.

6. The method of claim 1, wherein when the network configuration comprises the offset value, the computing of the median value is based on a sum or a difference of an absolute CQI for the first codeword and the offset value, wherein the absolute CQI for the first codeword is determined based on an absolute CQI rank configuration for the first codeword.

7. The method according to claim 2 or 6, wherein when the network configuration comprises the absolute CQI level configuration of the second codeword and the network configuration comprises the offset value, the median is the CQI index of the spectral efficiency corresponding to the sum or difference between the offset value and the absolute CQI of the first codeword in the absolute CQI level configuration of the second codeword.

8. The method of claim 6, wherein when the network configuration does not include an absolute CQI ranking configuration for the second codeword and the network configuration includes the offset value, the median value is a sum or difference of an absolute CQI for the first codeword and the offset value.

9. The method according to any of claims 1 to 3, wherein when the network configuration comprises a differential CQI level configuration, the differential CQI is a CQI sequence number corresponding to the differential CQI queried in the differential CQI level configuration.

10. The method according to any of claims 1 to 3, wherein the reporting, by the terminal, of the differential Channel Quality Indication (CQI) comprises:

and the terminal reports the differential CQI through the subframe configured by the network equipment.

11. A method according to any of claims 1 to 3, wherein the network is configured to be semi-statically configured by radio resource control messages.

12. A method for reporting a Channel Quality Indicator (CQI), comprising:

the network equipment sends configuration information, wherein the configuration information comprises absolute CQI grade configuration of a first code word and one or more of the following items, and the configuration information is used for configuring a subframe used by a terminal for reporting differential CQI, and the differential CQI is determined based on the configuration information:

absolute CQI level configuration for a second codeword;

a median configuration or a bias value.

13. The method of claim 12, wherein an absolute CQI level configuration for the first codeword and an absolute CQI level configuration for the second codeword are different.

14. A terminal, characterized in that the terminal comprises:

a sending unit, configured to report a differential channel quality indicator CQI, where the differential CQI is determined based on a median and an absolute CQI of a second codeword;

an absolute CQI rank configuration for the second codeword;

a median configuration or a bias value.

15. The terminal of claim 14, wherein when the network configuration comprises an absolute CQI level configuration for the second codeword, the absolute CQI level configuration for the second codeword is different from the absolute CQI level configuration for the first codeword, and wherein the calculation of the median value and the absolute CQI for the second codeword is based on the absolute CQI level configuration for the second codeword.

16. The terminal of claim 14, wherein the median is calculated based on an absolute CQI for a first codeword when the network configuration does not include the median configuration and the bias value, wherein the absolute CQI for the first codeword is determined based on an absolute CQI rank configuration for the first codeword.

17. The terminal according to claim 15 or 16, wherein when the network configuration includes the absolute CQI level configuration of the second codeword and the network configuration does not include the median configuration and the offset value, the median is a CQI number closest to a spectral efficiency corresponding to the absolute CQI of the first codeword in the absolute CQI level configuration of the second codeword.

18. The terminal of claim 14, wherein when the network configuration comprises the median configuration, the median takes a value of the median configuration.

19. The terminal of claim 14, wherein when the network configuration comprises the offset value, the median is calculated based on a sum or a difference of an absolute CQI for the first codeword and the offset value, wherein the absolute CQI for the first codeword is determined based on an absolute CQI rank configuration for the first codeword.

20. The terminal according to claim 15 or 19, wherein when the network configuration comprises an absolute CQI level configuration of the second codeword and the network configuration comprises the offset value, the median is a CQI index of a spectral efficiency corresponding to a sum or a difference between the offset value and an absolute CQI of the first codeword in the absolute CQI level configuration of the second codeword.

21. The terminal of claim 19, wherein when the network configuration does not include an absolute CQI level configuration for the second codeword and the network configuration includes the offset value, the median value is a sum or a difference of an absolute CQI for the first codeword and the offset value.

22. The terminal according to any of claims 14 to 16, wherein when the network configuration comprises a differential CQI rank configuration, the differential CQI is a CQI sequence number corresponding to the differential CQI queried in the differential CQI rank configuration.

23. The terminal according to any of claims 14 to 16,

the sending unit is specifically configured to report the differential CQI through a subframe configured by the network device.

24. A terminal according to any of claims 14 to 16, wherein the network is configured to be semi-statically configured via radio resource control messages.

25. A network device, characterized in that the network device comprises:

a sending unit, configured to send configuration information, where the configuration information includes an absolute CQI level configuration of a first codeword and one or more of the following, and the configuration information is used to configure a subframe used by a terminal to report a differential CQI, where the differential CQI is determined based on the configuration information:

absolute CQI level configuration for a second codeword;

a median configuration or a bias value.

26. The network device of claim 25, wherein an absolute CQI level configuration for the first codeword and an absolute CQI level configuration for the second codeword are different.