CN101789841B - Channel quality information feedback method and terminal - Google Patents
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Abstract
The invention discloses a channel quality information (CQI) feedback method and terminal and a terminal. In the method, the terminal feeds back CQI to the network side, wherein CQI comprises the wideband CQI index of the first code stream and the wideband differential CQI index offset level of the second code stream; and the wideband differential CQI index offset level of the second code stream is the wideband CQI index of the first code stream minus the wideband CQI index of the second code stream. When the terminal feeds back CQI, the feedback information comprises the wideband differential CQI offset level of CW1, therefore, the technical scheme provided by the invention solves the problem that the overhead is high when the terminal feeds back nonperiodic CQI in the related art, thus further reducing the feedback overhead of the terminal.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to a method and a terminal for feeding back aperiodic Channel Quality Information (CQI).
Background
Currently, in the Technical Specification (TS) 36.2125.2.2.6 and 3GPP TS 36.2125.2.3.3 of the third Generation partnership project (3rd Generation partnership project, abbreviated as 3GPP), aperiodic CQI feedback on a Physical Uplink Shared Channel (PUSCH) and periodic CQI feedback on a Physical Uplink Control Channel (PUCCH) are defined, respectively.
In different transmission modes, the feedback mode and the feedback overhead of the terminal are different. In this application, a closed-loop spatial multiplexing transmission mode in which two codeword streams (CW for short) and a rank indicator (RI for short) are 2 and two antenna ports is mainly described.
For aperiodic CQI feedback (closed-loop spatial multiplexing transmission mode with 2 CWs, RI ═ 2, and 2 antenna ports), the feedback is performed according to different CWs, and specifically includes wideband (wideband) CQI feedback, subband (subband) CQI feedback configured at a higher layer, and CQI feedback selected by a terminal (User Equipment, abbreviated as UE).
(1) The wideband CQI feedback overhead is as follows:
4(CW0 wideband CQI)+4(CW1 wideband CQI)bits
specifically, the first 4bits are used to transmit the CW0 wideband CQI index, and the last 4bits are used to transmit the CW1 wideband CQI index.
(2) The overhead of the subband CQI feedback configured by the high layer is as follows:
4(CW0 wideband CQI)+4(CW1 wideband CQI)bits
2N (CW 0sub band differential CQI) +2N (CW1 sub band differential CQI) bits
Specifically, the first 4bits are used to transmit the CW0 wideband CQI index, the last 4bits are used to transmit the CW1 wideband CQI index, the first 2Nbits are used to transmit the CW0 subbandCQI differential offset level, and the last 2Nbits are used to transmit the CW1 subbband differential CQI offset level.
(3) The UE selection subband CQI feedback overhead is as follows:
4(CW0 wideband CQI)+4(CW1 wideband CQI)bits
2(CW 0sub band differential CQI) +2(CW1 sub band differential CQI) bits
L (M better sub-positions selected by the UE) bits
Specifically, the first 4bits are used to transmit the CW0 wideband CQI index, the last 4bits are used to transmit the CW1 wideband CQI index, the first 2bits are used to transmit the CW0subband CQI differential offset level, the last 2bits are used to transmit the CW1 subband CQI differential offset level, and the L bits are used to transmit the M better subband positions selected by the UE.
As can be seen from the above description, the overhead of the terminal for aperiodic CQI feedback is relatively large.
Disclosure of Invention
The present invention is proposed to solve the problem of high overhead when the terminal performs aperiodic CQI feedback in the related art, and therefore, a main object of the present invention is to provide an improved aperiodic CQI feedback scheme to solve the above problem.
According to an aspect of the present invention, there is provided a channel quality information CQI feedback method.
The channel quality information CQI feedback method comprises the following steps: the terminal feeds back CQI feedback information to the network side, wherein the CQI feedback information comprises: the wideband CQI index of the first code word stream and the wideband CQI index of the second code word stream are in differential offset level; wherein the wideband CQI index differential offset level of the second stream of codewords is equal to the wideband CQI index of the first stream of codewords minus the wideband CQI index of the second stream of codewords.
According to another aspect of the present invention, there is provided a CQI feedback method.
The CQI feedback method according to the present invention comprises: the terminal feeds back CQI feedback information to the network side, wherein the CQI feedback information comprises: the wideband CQI index of the first codeword stream, the wideband CQI index differential offset level of the second codeword stream, the sub-band CQI index differential offset level of the first codeword stream, and the sub-band CQI index differential offset level of the second codeword stream, wherein the sub-band CQI index differential offset level of the first codeword stream is the sub-band CQI index of the first codeword stream minus the wideband CQI index of the first codeword stream, the wideband CQI index differential offset level of the second codeword stream is the wideband CQI index of the first codeword stream minus the wideband CQI index of the second codeword stream, and the sub-band CQI index differential offset level of the second codeword stream is the sub-band CQI index of the second codeword stream minus the wideband CQI index of the first codeword stream.
According to still another aspect of the present invention, there is provided a CQI feedback method.
The CQI feedback method according to the present invention comprises: the terminal feeds back CQI feedback information to the network side, wherein the CQI feedback information comprises: the wideband CQI index of the first codeword stream, the wideband CQI index differential offset level of the second codeword stream, the average CQI index differential offset level of a plurality of subbands in the first codeword stream selected by the terminal, and the average CQI index differential offset level of a plurality of subbands in the second codeword stream selected by the terminal; the terminal selects an average CQI index differential offset level of a plurality of sub-bands in the first codeword stream as the average CQI index of the plurality of sub-bands in the first codeword stream minus the wideband CQI index of the first codeword stream, the terminal selects a wideband CQI index differential offset level of the second codeword stream as the wideband CQI index of the first codeword stream minus the wideband CQI index of the second codeword stream, and the terminal selects a plurality of sub-bands in the second codeword stream as the average CQI index of the plurality of sub-bands in the second codeword stream minus the wideband CQI index of the first codeword stream.
According to still another aspect of the present invention, there is provided a CQI feedback terminal.
The CQI feedback terminal according to the present invention includes: a receiving module, configured to receive downlink control information from a network side, where the downlink control information carries indication information indicating a feedback mode in which a terminal performs aperiodic CQI feedback; the determining module is used for determining a feedback mode of the terminal for non-periodic CQI feedback according to the indication information in the downlink control information; a feedback module, configured to feed back CQI feedback information to a network side, where the CQI feedback information includes: the wideband CQI index and the wideband CQI index differential offset level; and the calling module is used for calling the feedback module to feed back according to the feedback mode determined by the determining module.
According to the invention, when the terminal feeds back the CQI, the feedback information comprises the broadband CQI differential offset grade of the CW1, so that the problem of high overhead when the terminal feeds back the aperiodic CQI in the related technology is solved, and the feedback overhead of the terminal is further reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 is a block diagram of a terminal according to an embodiment of the present invention.
Detailed Description
Overview of the function
In view of the problem of relatively large overhead when the terminal performs aperiodic CQI feedback in the related art, the embodiment of the present invention provides an improved CQI feedback scheme, where when the terminal performs CQI feedback, the feedback information includes a wideband CQI differential offset level of CW1, and three feedback modes, i.e., wideband CQI feedback according to an indication of a network side, high-level subband CQI feedback, and terminal-selected subband CQI feedback, are described in detail below.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
In 3GPP TS 36.2116.3.3.2, a mapping relationship of codeword streams to layers in spatial multiplexing is defined. When two codeword streams, two layers, and two antenna ports are used, codeword stream 0 is mapped to layer 0, and codeword stream 1 is mapped to layer 1, i.e., codeword streams and layers are in a one-to-one correspondence relationship. Thus, the CQI on layer 0 and layer 1 measured by the terminal is the same as the CQI on codeword stream 0 and codeword stream 1. The embodiment of the invention provides a method for differentiating wideband CQI on two code word streams when aperiodic CQI on a PUSCH is fed back. The following embodiment exemplifies a closed-loop spatial multiplexing transmission mode based on two codeword streams (first codeword stream and second codeword stream, hereinafter abbreviated as CW0 and CW1), rank indication of 2, and two antenna ports.
Method embodiment
Example one
According to an embodiment of the present invention, there is provided a CQI feedback method for aperiodic wideband CQI feedback based on two codeword streams, the method including: the terminal feeds back CQI feedback information to the network side, wherein the CQI feedback information comprises: the wideband CQI index of CW0 and the wideband CQI index of CW1 are differentially offset levels, wherein the wideband CQI index differential offset level of CW1 is the wideband CQI index of CW0 minus the wideband CQI index of CW 1.
With the embodiment, the overhead used by the CQI feedback information is 7bits, wherein the overhead used by the wideband CQI index differential offset level of CW1 is 3 bits.
Specifically, when higher layer (i.e. network side) configures the wideband CQI feedback, the wideband CQI of CW0 and CW1 performs differential feedback, and the index differential offset level of codeword stream CW1 is obtained by differentiating the wideband CQI index of CW0 and the wideband CQI index of CW1, and is defined as:
wideband CQI differential offset level for CW1 ═ wideband CQI index for CW0-wideband CQI index for CW1
Wherein, the mapping of the wideband differential CQI to the offset level can follow the existing mapping table. The terminal reports the wideband CQI index (4bits) of CW0 and the wideband CQI index differential offset level (3bits) of CW1 at the same time, when the wideband CQI is fed back in an aperiodic manner, CW is 2, RI is 2, and the feedback overhead of two antenna ports is shown in table 1 below.
Table 1 shows the feedback overhead for two antenna ports, where CW is 2 and RI is 2 in the aperiodic wideband CQI feedback
With the embodiment, when the aperiodic wideband CQI is fed back, CW is 2 and RI is 2, and the feedback overhead at two antenna ports is reduced by 1 bit.
Example two
According to an embodiment of the present invention, there is provided a CQI feedback method for configuring subband CQI feedback based on an aperiodic high layer of two codeword streams, the method including: the terminal feeds back CQI information to the network side, wherein the CQI feedback information comprises: a wideband CQI index of CW0, a wideband CQI index differential offset level of CW1, a subband CQI index differential offset level of CW0, and a subband CQI index differential offset level of CW1, wherein the subband CQI index differential offset level of CW0 is the subband CQI index of CW0 minus the wideband CQI index of CW0, the wideband CQI index differential offset level of CW1 is the wideband CQI index of CW0 minus the wideband CQI index of CW1, and the subband CQI index differential offset level of CW1 is the subband CQI index of CW1 minus the wideband CQI index of CW 0.
With this embodiment, the bandwidth CQI index differential offset level of CW1 uses an overhead of 3 bits.
Specifically, when the higher layer configures the sub-band feedback, the wideband cqi on the two CWs is fed back differentially. The wideband CQI of CW0 and CW1 are fed back differentially, and the sub-band index differential offset levels of the two CWs are respectively defined. The subbbanddifferential CQI index offset level of CW0 is defined by the difference between the subbband CQI index of CW0 and the wideband CQI index of CW0 as:
subband differential CQI offset level for CW0＝subband CQIindex for CW0-wideband CQI index for CW0
the sub-and differential CQI offset level of CW1 is defined as:
subband differential CQI offset level for CW1＝subband CQIindex for CW1-wideband CQI index for CW0
that is, the sub band CQI index differential offset level of CW1 is differentiated by the sub band CQI index of CW1 and the wideband CQI index of CW 0.
And the terminal reports the wideband CQI index (4bits) of CW0 and the wideband CQI index differential offset level (3bits) of CW1, and simultaneously reports the CW0subband CQI index (2Nbits) differential offset level and the subband CQI index differential offset level (2Nbits) of CW1, wherein N is the number of subbands. When the sub-band CQI feedback is configured in the aperiodic high layer, CW is 2 and RI is 2, and the feedback overhead for two antenna ports is shown in table 2.
Table 2 shows feedback overhead when the sub-band CQI feedback is configured at the non-periodic upper layer, where CW is 2 and RI is 2, and the feedback overhead is measured at two antenna ports
By the embodiment, when the sub-band CQI feedback is configured at the non-periodic high layer, CW is 2, RI is 2, and the feedback overhead at two antenna ports is reduced by 1 bit.
EXAMPLE III
According to an embodiment of the present invention, there is provided a CQI feedback method for selecting a subbbandcqi feedback based on an aperiodic terminal of two codeword streams, the method including: the terminal feeds back CQI feedback information to the network side, wherein the CQI feedback information comprises: the bandwidth CQI index differential offset level of CW0, the bandwidth CQI index differential offset level of CW1, the average CQI index differential offset level of the better subbands in CW0 selected by the terminal, and the average CQI differential offset level of the better subbands in CW1 selected by the terminal, wherein the bandwidth CQI index differential offset level of CW1 is the bandwidth CQI index of CW0 minus the bandwidth CQI index of CW1, the average CQI index differential offset level of the better subbands selected by CW1 is the average CQI index of the better subbands selected by CW1 minus the bandwidth CQI index of CW0, and the overhead used for the bandwidth CQI index differential offset level of CW1 is 3 bits.
Specifically, when the UE selects subband CQI feedback, the wideband CQI on the two CWs is fed back differentially. The sub-band differential offset levels of the two CWs are defined separately. The differential CQI offset level of CW0 is differentiated by the M better sub-band average CQI indices selected by CW0 and the wideband CQI index of CW0, defined as:
differential CQI offset level for CW 0-M selected subcarriers average CQI index for CW0-wideband CQI index for CW0
The sub-and differential CQI offset level of CW1 is defined as:
differential CQI offset level for CW 1-M selected subcarriers average CQI index for CW1-wideband CQI index for CW0
The sub band CQI index differential offset level of CW1 is the difference between the M better sub band average CQI indices selected by CW1 and the wideband CQI index of CW 0.
And the terminal reports the wideband CQI (4bits) of CW0 and the wideband CQI differential offset level (3bits) of CW1, and simultaneously reports the average CQI index differential offset level (2bits) of M better sub bands selected by CW0 and the average CQI index differential offset level (2bits) of CW1M better sub bands. When the aperiodic UE selects the sub-band CQI feedback, CW is 2 and RI is 2, and the feedback overhead at two antenna ports is shown in table 3 below.
Table 3 shows feedback overhead when aperiodic UE selects subband CQI feedback, CW is 2 and RI is 2, and two antenna ports have feedback overhead
With this embodiment, when the aperiodic UE selects the sub-band CQI feedback, CW is 2 and RI is 2, and the feedback overhead at two antenna ports is reduced by 1 bit.
The implementation process of the embodiment of the present invention will be described in detail below with reference to an example, which includes the following steps:
the method comprises the steps that firstly, a terminal receives Downlink Control Information (DCI) format (format)0, if a CQI request indication (request field) is 1 or random access response authorization is received, UE performs aperiodic CQI reporting, if User Equipment (UE) configured by Radio Resource Control (RRC) is wireless CQI feedback, the second step is performed, if UE configured by RRC is sub-CQI feedback configured by a high layer, the third step is performed, and if the UE configured by RRC is sub-CQI feedback selected by the UE, the fourth step is performed.
And secondly, when the RRC configures the UE for wideband CQI feedback, the terminal calculates wideband CQI on the codeword flow 0, and the terminal calculates the wideband CQI differential offset level of the CW1 according to the difference value of the wideband CQI index of the CW0 and the wideband CQI index of the CW 1.
The terminal reports the wideband CQI index (4bits) of CW0 and the wideband CQI index differential offset level (3bits) of CW 1.
Thirdly, when the RRC configures the UE to configure the subband CQI feedback for the higher layer, the UE calculates the wideband CQI on the CW0 and the wideband CQI on the CW1, and the subband index differential offset levels of the two CWs are respectively defined. The terminal calculates the subbaseband CQI index differential offset level of CW0 according to the difference between the subbaseband CQI index of CW0 and the wideband CQI index of CW 0. The sub-band differential CQI index differential offset level of CW1 is calculated as the difference of the sub-band CQI index of CW1 and the wideband CQI index of CW 0.
And the terminal reports the wideband CQI index (4bits) of CW0 and the wideband CQI index differential offset level (3bits) of CW1, and reports the CW0subband CQI (2Nbits) index differential offset level and the CQI subband index differential offset level (2Nbits) of CW1, wherein N is the number of subbands.
Fourthly, when the RRC is configured to UE selects the subband CQI feedback, the terminal calculates the wideband CQI on the CW0 and the wideband CQI on the CW1, and the subband differential offset levels of the two CWs are respectively defined. The terminal calculates the sub band differential CQI index differential offset level of CW0 according to the difference value of CW 0M selected better sub band CQI index and CW0 wideband CQI index. The subbbanddifferential CQI index offset level of CW1 is calculated as the difference of the better subbband average CQI index of the CW1M choices and the wideband CQI index of CW 0.
The terminal reports the wideband CQI index (4bits) of CW0 and the wideband CQI index differential offset level (3bits) of CW1, and simultaneously reports the average CQI index differential offset level (2bits) of M better subbands selected by CW0, the average CQI index differential offset level (2bits) of CW1M better subbands and the position indication (Lbits) of M selected subbands
By the embodiment, the overhead of the aperiodic CQI feedback can be reduced. When two CW transmissions, can reduce the feedback overhead of 1bit, while can unify two antenna ports, periodic and aperiodic CQI feedback method.
Specifically, in the related art, the periodic CQI feedback in the closed-loop spatial multiplexing transmission mode with 2 CWs, RI — 2, and 2 antenna ports includes: wideband CQI feedback and UE selection sub feedback. Unlike non-periodic CQI feedback, periodic CQI feedback is fed back according to the number of layers, independent of the codeword stream.
(1) The wideband CQI feedback overhead is as follows:
4 (CQI on layer 0) +3 (spatial differential CQI on layer 1) bits
(2) The CQI feedback overhead of UE selection of subband is as follows:
4 (CQI on layer 0) +3 (spatial differential CQI on layer 1) bits
Therefore, the embodiment of the invention can unify the two antenna ports, and can realize the periodic and aperiodic CQI feedback method.
Device embodiment
According to an embodiment of the present invention, a terminal is provided. Fig. 1 is a block diagram of a terminal according to an embodiment of the present invention, and as shown in fig. 1, the terminal includes: the receiving module 12, the determining module 14, the feedback module 16, and the invoking module 18, which are described below.
A receiving module 12, configured to receive downlink control information from a network side, where the downlink control information carries indication information indicating a feedback mode in which a terminal performs aperiodic CQI feedback; a determining module 14, connected to the receiving module 12, configured to determine, according to the indication information in the downlink control information, a feedback mode for the terminal to perform aperiodic CQI feedback; a feedback module 16, configured to feed back CQI feedback information to the network side, where the CQI feedback information includes: the wideband CQI index and the wideband CQI index differential offset level; and the calling module 18 is connected to the determining module 14 and the feedback module 16, and is used for calling the feedback module 16 to perform feedback according to the feedback mode determined by the determining module 14.
Specifically, the above-described feedback manner includes three cases, which will be described in detail below.
(1) If the feedback mode is wideband CQI feedback, the CQI feedback information fed back to the network side by the feedback module 16 includes: the wideband CQI index of CW0 and the wideband CQI index of CW1 differ by an offset level, where the wideband CQI index differential offset level of CW1 is equal to the wideband CQI index of CW0 minus the wideband CQI index of CW 1.
(2) If the feedback mode is sub-band CQI feedback configured for the high layer, the CQI feedback information fed back to the network side by the feedback module 16 includes: a wideband CQI index of CW0, a wideband CQI index differential offset level of CW1, a sub-band CQI index differential offset level of CW0, and a sub-band CQI index differential offset level of CW1, wherein the sub-band CQI index differential offset level of CW0 is the sub-band CQI index of CW0 minus the wideband CQI index of CW0, the wideband CQI index differential offset level of CW1 is the wideband CQI index of CW0 minus the wideband CQI index of CW1, and the sub-band CQI index differential offset level of CW1 is the sub-band CQI index of CW1 minus the wideband CQI index of CW 0.
(3) If the feedback mode is that the terminal selects sub-band CQI feedback, the CQI feedback information fed back to the network side by the feedback module 16 includes: a wideband CQI index of CW0, a wideband CQI index differential offset level of CW1, an average CQI differential offset level of a plurality of better subbands in CW0 selected by the terminal, and an average CQI differential offset level of a plurality of better subbands in CW1 selected by the terminal, wherein the average CQI index differential offset level of the plurality of better subbands in CW0 is the average CQI index of the plurality of better subbands in CW0 minus the wideband CQI index of CW0, the wideband CQI index differential offset level of CW1 is the wideband CQI index of CW0 minus the wideband CQI index of CW1, and the average CQI index differential offset level of the plurality of better subbands in CW1 selected by the terminal is the average CQI index of the plurality of better subbands in CW1 minus the wideband CQI index of CW 0.
By the embodiment, the terminal is provided, wherein the CQI feedback information fed back to the network side comprises the wideband CQI index and the wideband CQI index differential offset level, and the terminal can reduce feedback overhead.
In summary, with the improved CQI feedback scheme provided by the embodiments of the present invention, when the terminal performs CQI feedback, the feedback information includes the wideband CQI differential offset level of CW1, which solves the problem of relatively large overhead when the terminal performs aperiodic CQI feedback in the related art, and reduces the feedback overhead of the terminal.
It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and they may alternatively be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, or fabricated separately as individual integrated circuit modules, or fabricated as a single integrated circuit module from multiple modules or steps. Thus, the present invention is not limited to any specific combination of hardware and software.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A channel quality information, CQI, feedback method for aperiodic wideband CQI feedback based on two streams of codewords, the two streams of codewords comprising a first stream of codewords and a second stream of codewords, the method comprising:
the terminal feeds back CQI feedback information to a network side, wherein the CQI feedback information comprises: the wideband CQI index of the first codeword stream and the wideband CQI index of the second codeword stream are differentially offset levels;
wherein a wideband CQI index differential offset level of the second stream of codewords is equal to a wideband CQI index of the first stream of codewords minus a wideband CQI index of the second stream of codewords.
2. The method of claim 1, wherein an overhead used for wideband CQI index differential offset levels for the second stream of codewords is 3 bits.
3. A CQI feedback method for configuring subband CQI feedback based on aperiodic high layers of two codeword streams, the method comprising:
the terminal feeds back CQI feedback information to a network side, wherein the CQI feedback information comprises: a wideband CQI index for a first stream of codewords, a wideband CQI index differential offset level for a second stream of codewords, a sub-band CQI index differential offset level for the first stream of codewords and a sub-band CQI index differential offset level for the second stream of codewords,
the subband CQI index differential offset level of the first codeword stream is the subband CQI index of the first codeword stream minus the wideband CQI index of the first codeword stream, the wideband CQI index differential offset level of the second codeword stream is the wideband CQI index of the first codeword stream minus the wideband CQI index of the second codeword stream, and the subband CQI index differential offset level of the second codeword stream is the subband CQI index of the second codeword stream minus the wideband CQI index of the first codeword stream.
4. The method of claim 3, wherein an overhead used for wideband CQI index differential offset levels for the second stream of codewords is 3 bits.
5. A CQI feedback method for selecting sub-band CQI feedback based on aperiodic terminals for two codeword streams, the method comprising:
the terminal feeds back CQI feedback information to a network side, wherein the CQI feedback information comprises: a wideband CQI index of a first stream of codewords, a wideband CQI index differential offset level of a second stream of codewords, an average CQI index differential offset level for a plurality of subbands in the first stream of codewords selected by the terminal, and an average CQI index differential offset level for a plurality of subbands in the second stream of codewords selected by the terminal;
the terminal selects an average CQI index differential offset level of a plurality of subbands in the first codeword stream to be the average CQI index of the plurality of subbands in the first codeword stream minus the wideband CQI index of the first codeword stream, the second codeword stream has a wideband CQI index differential offset level to be the wideband CQI index of the first codeword stream minus the wideband CQI index of the second codeword stream, and the terminal selects the second codeword stream having an average CQI index differential offset level of the plurality of subbands in the second codeword stream to be the average CQI index of the plurality of subbands in the second codeword stream minus the wideband CQI index of the first codeword stream.
6. The method of claim 5, wherein the overhead used by the wideband indexed differential offset levels of the second stream of codewords is 3 bits.
7. A terminal, comprising:
a receiving module, configured to receive downlink control information from a network side, where the downlink control information carries indication information indicating a feedback mode in which a terminal performs aperiodic CQI feedback;
a determining module, configured to determine, according to the indication information in the downlink control information, a feedback mode for the terminal to perform aperiodic CQI feedback;
a feedback module, configured to feed back CQI feedback information to the network side, where the CQI feedback information includes: the wideband CQI index and the wideband CQI index differential offset level;
the calling module is used for calling the feedback module to feed back according to the feedback mode determined by the determining module;
wherein,
the feedback mode is broadband CQI feedback; the wideband CQI index and the wideband CQI index differential offset levels comprise: a wideband CQI index of a first stream of codewords and a wideband CQI index differential offset level of a second stream of codewords, wherein the wideband CQI index differential offset level of the second stream of codewords is equal to the wideband CQI index of the first stream of codewords minus the wideband CQI index of the second stream of codewords;
or, the feedback mode is sub-band CQI feedback configured by a high layer; the wideband CQI index and the wideband CQI index differential offset levels comprise: the wideband CQI index of the first codeword stream, the wideband CQI index differential offset level of the second codeword stream, the subband CQI index differential offset level of the first codeword stream, and the subband CQI index differential offset level of the second codeword stream, wherein the subband CQI index differential offset level of the first codeword stream is the subband CQI index of the first codeword stream minus the wideband CQI index of the first codeword stream, the wideband CQI index differential offset level of the second codeword stream is the wideband CQI index of the first codeword stream minus the wideband CQI index of the second codeword stream, and the subband CQI index differential offset level of the second codeword stream is the subband CQI index of the second codeword stream minus the wideband CQI index of the first codeword stream;
or, the feedback mode is that the terminal selects sub-band CQI feedback; the wideband CQI index and the wideband CQI index differential offset levels comprise: a wideband CQI index for the first stream of codewords, a wideband CQI index differential offset level for the second stream of codewords, an average CQI differential offset level for a plurality of subbands in the first stream of codewords selected by the terminal, and an average CQI differential offset level for a plurality of subbands in the second stream of codewords selected by the terminal, wherein the terminal selects an average CQI index differential offset level of the plurality of subbands in the first codeword stream as the average CQI index of the plurality of subbands in the first codeword stream minus the wideband CQI index of the first codeword stream, the wideband CQI index differential offset level for the second stream of codewords is the wideband CQI index for the first stream of codewords minus the wideband CQI index for the second stream of codewords, the terminal selects an average CQI index differential offset level for the plurality of subbands in the second codeword stream as the average CQI index for the plurality of subbands in the second codeword stream minus the wideband CQI index for the first codeword stream.
Priority Applications (1)
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| CN102404085B (en) * | 2010-09-17 | 2014-11-05 | 华为技术有限公司 | Reporting method for channel status information, base station thereof and user equipment thereof |
| CN102448114B (en) * | 2010-10-07 | 2015-07-15 | 上海贝尔股份有限公司 | Method and equipment for improving transmission accuracy of CSI (Channel State Information) through PUCCH (Physical Uplink Control Channel) |
| JP5896619B2 (en) * | 2011-04-05 | 2016-03-30 | シャープ株式会社 | Terminal apparatus, base station apparatus, communication system, and communication method |
| CN104935402B (en) * | 2014-03-21 | 2018-07-10 | 上海诺基亚贝尔股份有限公司 | The method, apparatus and equipment that subband CQI is reported are carried out in LC-MTC user equipmenies |
| CN105207738B (en) * | 2014-06-10 | 2018-08-10 | 中国移动通信集团公司 | A kind of channel parameter report method, device, communication terminal and base station |
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| EP1575234A2 (en) * | 2004-03-12 | 2005-09-14 | Samsung Electronics Co., Ltd. | Method and apparatus for transmitting/receiver channel quality information in a communication system using an orthogonal frequency division multiplexing |
| US20080101498A1 (en) * | 2006-11-01 | 2008-05-01 | Samsung Electronics Co., Ltd. | Method and apparatus for transmitting/receiving feedback information in a wireless packet data communication system |
| WO2008096997A2 (en) * | 2007-02-05 | 2008-08-14 | Lg Electronics Inc. | Method for transmitting channel quality information based on differential scheme |
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| EP1575234A2 (en) * | 2004-03-12 | 2005-09-14 | Samsung Electronics Co., Ltd. | Method and apparatus for transmitting/receiver channel quality information in a communication system using an orthogonal frequency division multiplexing |
| US20080101498A1 (en) * | 2006-11-01 | 2008-05-01 | Samsung Electronics Co., Ltd. | Method and apparatus for transmitting/receiving feedback information in a wireless packet data communication system |
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