WO2011047588A1 - Method for feeding back and receiving indirect channel information, equipment and system therefor - Google Patents

Abstract

Provided is a method for feeding back indirect channel information, said method including: feeding back a wideband Channel Quality Indicator (CQI); feeding back the position of a subband wherein the difference between the subband CQI and the wideband CQI is beyond a predetermined range; and feeding back the difference between the subband CQI of said subband and the wideband CQI. Correspondingly, another method for feeding back indirect channel information, a reception method, a user equipment, a reception equipment and a communication system are also provided by embodiments of the present invention, which can reduce the volume of information transmitted through an air interface and the feedback overhead.

Description

 Inter-channel information feedback method, receiving method, device and system. The application is submitted to the Chinese Patent Office on October 22, 2009, and the application number is 200910180959.7. The invention name is "an indirect channel information feedback method, receiving method, device and The priority of the Chinese Patent Application, the entire disclosure of which is incorporated herein by reference. Technical field

 The present invention relates to the field of communications, and in particular, to an indirect channel information feedback method, a receiving method, a device, and a system.

Background technique

 LTE (Long Term Evolution) is an evolution of 3G. It improves and enhances 3G air access technology, and replaces 3GPP (3th Generation Partner Project) with OFDMA (Orthogonal Frequency Division Multiple Access). , 3rd Generation Partnership Project) Long-term use of CDMA (Code Division Multiple Access) as multiple access technology, and extensive use of MIM0 (Multiple Input Multiple Output) technology and adaptive technology to improve data The rate and system performance can provide a peak rate of 100 Mbit/s and uplink 50 Mbit/s in a 20 MHz spectrum bandwidth, improving the performance of cell edge users, increasing cell capacity and reducing system delay.

 LTE-A (Long Term Evolution-Advanced) is a further enhancement of LTE technology, and LTE-A system has higher bandwidth requirements than LTE systems. In the LTE-A system, the UE needs to feed back some channel state information to the system, and the eNB (Evolved Node B/Base Station) determines the modulation mode and coding mode used by the downlink according to the received feedback information.

 There are three types of uplink feedback modes:

 1. Direct channel status information feedback.

2. Channel state information feedback based on SRS (Sounding Reference Signal). 3. Indirect channel status information feedback.

 The information of the indirect channel state information feedback includes CQI (Channa Qua Li ty Indi ca tor), PMI (Precoding Ma Tr Indica tor), and Ri ( Rank Indication). Indications, etc., after receiving the information, the eNB can better utilize the channel conditions for determining downlink MIM0 processing, such as transmit diversity, beamforming, space division multiplexing, and the like.

 In the prior art, taking the feedback of the CQI as an example, in order to reflect the situation that the UE receives the signal, the UE needs to report the wideband CQI (wideband CQI) indicating the channel condition on the entire working bandwidth to the system; meanwhile, in order to provide the eNB with the scheduled reference information. In some modes, the UE also needs to report the sub-band CQI (subband CQI) of all sub-bands or the preferred sub-bands in the system to the system, and then can analyze the channel conditions on some local bandwidths.

 A full feedback scheme that feeds back a wideband CQI channel and then feeds back the CQI information of all subbands can get the channel condition most comprehensively, but the feedback overhead is also large. In the prior art, differential feedback is applied to the sub-band CQI feedback, that is, for the full feedback strategy, all sub-band CQIs only feedback the difference between them and the wideband CQI. Currently, it takes 4 bits to feed back one CQI value and 2 bits to feed back the differential value. If the number of subbands to be fed back is N, the overhead of the existing feedback is overhead = 4 + 2N, that is, a 4-bit wideband CQI value is fed back first, and then the difference value of each subband CQI and the wideband CQI is fed back, each 2 bits. .

 In the process of implementing the above-mentioned indirect channel state information feedback, the inventors found that at least the following problems exist in the prior art:

 Although the sub-band differential feedback method with full feedback reduces the air interface resource overhead, the feedback overhead is still large, resulting in excessive bandwidth and channel resources.

Summary of the invention

 Embodiments of the present invention provide an indirect channel information feedback method, a receiving method, a device, and a system, which can reduce feedback overhead and reduce the amount of information transmitted by the air interface.

In order to achieve the above object, the embodiment of the present invention adopts the following technical solutions: An indirect channel information feedback method includes:

 Feedback wideband channel quality indication CQI;

 Transmitting a position of a subband with a difference between the subband CQI and the wideband CQI within a predetermined range; a difference between a feedback subband CQI and the wideband CQI between a CQI of a subband outside a predetermined range and the wideband CQI The difference.

 An indirect channel information feedback method includes:

 Feedback wideband channel quality indication CQI;

 Transmitting a position of a subband of a subband CQI and the wideband CQI within a predetermined range; and a difference between a feedback subband CQI and the wideband CQI between a CQI of a subband outside a predetermined range and the wideband CQI The difference. A user equipment, including:

 a first feedback unit, configured to feed back a wideband channel quality indicator CQI;

 a second feedback unit, configured to feed back a position of the subband with a difference between the subband CQI and the wideband CQI within a predetermined range;

 And a third feedback unit, configured to feed back a difference between a CQI of the subband whose subband CQI and the wideband CQI are outside a predetermined range and the wideband CQI.

 A user equipment, including:

 a fourth feedback unit, configured to feed back a wideband channel quality indicator CQI;

 a fifth feedback unit, configured to: feed back a position of a subband with a difference between the subband CQI and the wideband CQI within a predetermined range; and a sixth feedback unit, where a difference between the feedback subband CQI and the wideband CQI is predetermined The difference between the CQI of the out-of-range subband and the wideband CQI.

 An indirect channel information feedback receiving method includes:

 Receiving a broadband channel quality indicator CQI fed back by the user equipment;

Receiving a subband with a difference between the subband CQI fed back by the user equipment and the wideband CQI within a predetermined range s position;

 And receiving, by the user equipment, a difference between a CQI of the subband CQ I and the wideband CQ I that is outside a predetermined range and a difference between the CQI of the subband and the wideband CQI.

 A method for receiving indirect channel information includes:

 Receiving a broadband channel quality indicator CQI fed back by the user equipment;

 Receiving, by the user equipment, the subband CQ I and the broadband CQ I have a difference in the position of the subband within a predetermined range;

 And receiving, by the user equipment, the difference between the subband CQ I and the wideband CQ I that are outside the predetermined range and the difference between the subband CQI and the wideband CQI.

 A receiving device includes:

 a first receiving unit, configured to receive a broadband channel quality indicator CQI for receiving user feedback;

 a second receiving unit, configured to receive a position of the subband with a difference between the subband CQI fed back by the user equipment and the broadband CQI within a predetermined range;

 And a third receiving unit, configured to receive a difference between the subband CQI of the subband and the wideband CQI fed back by the user equipment.

 A receiving device includes:

 a fourth receiving unit, configured to receive a broadband channel quality indicator CQI fed back by the user equipment;

 a fifth receiving unit, configured to receive a position of the subband with a difference between the subband CQI fed back by the user equipment and the wideband CQI within a predetermined range;

 And a sixth receiving unit, configured to receive a difference between the subband CQI fed back by the user equipment and the wideband CQI, and a difference between the subband CQI outside the predetermined range and the wideband CQI.

 A communication system comprising any of the above communication devices and any of the above-described receiving devices.

According to the foregoing technical solution, the position of the subband with the difference between the feedback subband CQI and the wideband CQI is within a predetermined range or the position of the subband with the difference between the feedback subband CQ I and the wideband CQ I within a predetermined range. And the difference between the CQI and the wideband CQI of the subband whose feedback subband CQI and the wideband CQI are outside the predetermined range, and does not need to fully feed back the difference between the CQI and the wideband CQI of each subband. In this way, the required feedback overhead is smaller than the full feedback in the prior art, thereby reducing the amount of information transmitted over the air interface and saving channel resources. DRAWINGS

 In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any creative work.

 Figure 1 is a bitmap of feedback in the prior art;

 2 is a flow chart of a method for indirect channel information feedback according to an embodiment of the present invention; FIG. 3 is a bitmap of indirect channel information feedback according to an embodiment of the present invention;

 4 is a schematic diagram of a comparison of an indirect channel information feedback method and a prior art feedback overhead according to an embodiment of the present invention;

 FIG. 5 is a structural block diagram of a user equipment according to an embodiment of the present invention;

 FIG. 6 is a structural block diagram of a user equipment according to an embodiment of the present invention;

 FIG. 7 is a flow chart of a method for receiving indirect channel information according to an embodiment of the present invention; FIG. 8 is a block diagram of a method for receiving indirect channel information according to an embodiment of the present invention; FIG. 9 is a structural block diagram of a receiving device according to an embodiment of the present invention; ;

 FIG. 10 is a structural block diagram of a receiving device according to an embodiment of the present invention;

 FIG. 11 is a schematic block diagram of a communication system according to an embodiment of the present invention;

 FIG. 12 is a flow chart of a method for feeding back an indirect channel information according to an embodiment of the present invention; FIG. 13 is a flow chart of a method for feeding back an indirect channel information according to an embodiment of the present invention; FIG. 14 is a second feedback unit according to an embodiment of the present invention; Block diagram of the structure;

 FIG. 15 is a structural block diagram of a fifth feedback unit according to an embodiment of the present invention. detailed description

The technical solution in the embodiment of the present invention will be clarified in the following with reference to the accompanying drawings in the embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS It is apparent that the described embodiments are only a part of the embodiments of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

 The information of the indirect channel state information feedback includes a CQI (Channel Quality Indicator), a PMI (Precoding Matrix Indicator), and an RI (Rank Indication).

 Taking the feedback of the CQI as an example, in order to reflect the situation of the UE receiving the signal, the UE needs to report the broadband CQI indicating the channel condition on the entire working bandwidth to the system; meanwhile, in order to provide the eNB with the scheduled reference information, the UE needs to be in some modes. The sub-band CQI of all sub-bands or the preferred sub-bands in the system is reported to the system, and then the channel conditions on some local bandwidths can be analyzed.

 A full feedback scheme that feeds back a wideband CQI and then feeds back the CQI information of all subbands can get the channel condition most comprehensively, but the feedback overhead is also large. In the prior art, differential feedback is used for sub-band CQI feedback, that is, for a full feedback strategy, all sub-band CQIs only feed back the difference between them and the wideband CQI; taking the total number of sub-bands as 14 as an example, The feedback of a CQI value in the protocol requires 4 bits, as shown in Table 1; the feedback difference value requires 2 bits, as shown in Table 2.

10 64QAM 466 2. 7305

10 64QAM 466 2. 7305

 11 64QAM 567 3. 3223

 12 64QAM 666 3. 9023

 1 3 64QAM 772 4. 5234

 14 64QAM 873 5. 1152

 15 64QAM 948 5. 5547

 Table 1. CQI values indicated by 4 bits

 Table 2. Indicates the differential CQI value with 2 bits.

 If the number of subbands to be fed back is N, the overhead of the existing feedback is overhead = 4 + 2N, that is, a 4-bit wideband CQI value is fed back first, and then the difference value of each subband CQI and the wideband CQI is fed back, each 2 bits. . Here, assuming =14, the overhead is overhead = 4 + 2 14 = 32 bits, and the bitmap is shown in Figure 1.

 Embodiment 1 An embodiment of the present invention provides an indirect channel information feedback method. As shown in FIG. 2, the method steps include:

 S20 feedback wideband CQI.

 Specifically, it may be the same as the prior art, and in one embodiment, the wideband CQI value may be represented by 4 bits.

 S202. The position of the subband CQI that satisfies the feedback condition and the difference between the subband CQI and the wideband CQI are fed back.

Specifically, there are two cases: In one embodiment, the feedback condition may be: subband CQI and width The difference between the CQI and the CQI is within a preset range. It is well understood that the subband CQI and the wideband CQI are the special cases where the subband CQI and the wideband CQI are within a preset range, for example, The preset range is set to a value of 0. Of course, when you understand it well, the preset range can be flexibly set according to the actual situation.

 That is to say, only the sub-band CQI which is equal to or less than the wideband CQI is fed back. It is of course well understood that in one embodiment, when there are fewer subband CQIs that are equal to or less than the wideband CQI, feedback can be used with such feedback conditions to save feedback overhead.

 In one embodiment, the feedback condition may be: or the difference between the subband CQI and the wideband CQI is outside a preset range. Of course, it is understood that the subband CQI and the wideband CQI are not equal to the subband CQI and the wideband CQI. A special case where the difference is outside the preset range, for example, when the preset range is set to a value of 0. Of course, when you understand it well, the preset range can be flexibly set according to the actual situation.

 That is to say, only subband CQIs that are not equal to or larger than the wideband CQI are fed back. It is of course well understood that in one embodiment, when there are more sub-band CQIs that are not equal to or larger than the wideband CQI, feedback can be performed using such feedback conditions to save feedback overhead. At this time, the feedback may be performed by using the former feedback condition, and the embodiment of the present invention is not particularly limited.

 When the above two cases exist at the same time, one bit can be used to indicate the type of feedback condition, and no indication is required when a single situation occurs.

 "The difference between the feedback subband CQ I and the wideband CQI", the difference between the subband CQI and the wideband CQI can be indicated by 1 bit and fed back.

 Further, before performing the feedback, the method further includes: the UE estimating, according to the received downlink information of the eNB, a broadband and a sub-band signal to interference and noise ratio ( si gna l-to-interference-p lus-noi se ra tio ), according to the broadband The S INR calculates the wideband CQI, and calculates the CQI corresponding to each subband according to each subband S INR.

The indirect channel information feedback method provided by the embodiment of the present invention can only feed back the position of the subband CQI satisfying the feedback condition and the difference between the subband CQI and the wideband CQI. In this way, what is needed The feedback overhead is smaller than the full feedback in the prior art, which can reduce the amount of information transmitted by the air interface and save channel resources.

 An embodiment of the present invention provides an indirect channel information feedback method, as shown in FIG. 12, including: S210, a feedback wideband channel quality indicator CQI;

 S220: The position of the subband with the difference between the feedback subband CQI and the wideband CQI is outside a predetermined range; in an embodiment, the difference between the subband CQI and the wideband CQI is outside the predetermined range: subband CQI and broadband The CQIs are not equal, or the difference between the subband CQI and the wideband CQI exceeds a preset threshold.

 S230. Feed back a difference between the subband CQI of the subband and the wideband CQI. That is, the difference between the CQI of the subband whose feedback subband CQI and the wideband CQI are outside the predetermined range and the wideband CQI.

 In another embodiment, as shown in FIG. 12, the method further includes:

 S200: Estimate the broadband and the sub-band signal to interference and noise ratio SINR according to the received downlink information, calculate a wideband CQI according to the wideband SINR, and calculate a CQI corresponding to each subband according to each subband SINR.

 According to the above technical solution, the difference between the feedback subband CQI and the wideband CQI is in a subband position outside the predetermined range; and the CQI of the subband with the difference between the feedback subband CQI and the wideband CQI is outside a predetermined range. The difference between the wideband CQIs does not require full feedback of the difference between the CQI and the wideband CQI of each subband. In this way, the required feedback overhead is smaller than the full feedback in the prior art, so that the amount of information transmitted by the air interface can be reduced, and channel resources can be saved.

 An embodiment of the present invention provides an indirect channel information feedback method, as shown in FIG. 13, including: S310, a feedback wideband channel quality indicator CQI;

 S320. The position of the subband with the difference between the feedback subband CQI and the wideband CQI is within a predetermined range. In an embodiment, the difference between the subband CQI and the wideband CQI is within a predetermined range, including: subband CQI and broadband The CQI is equal, or the difference between the subband CQI and the wideband CQI does not exceed a preset threshold.

 S330. The difference between the CQI of the subband of the feedback subband CQI and the wideband CQI and the wideband CQI.

In another embodiment, as shown in FIG. 12, the method further includes: S300: Estimate the broadband and each sub-band signal to interference and noise ratio SINR according to the received downlink information, calculate a wideband CQI according to the wideband SINR, and calculate a CQI corresponding to each subband according to each subband SINR.

 According to the foregoing technical solution, the position of the subband with the difference between the feedback subband CQI and the wideband CQI within a predetermined range; and the CQI of the subband with the difference between the feedback subband CQI and the wideband CQI are outside a predetermined range. The difference between the wideband CQIs does not require full feedback of the difference between the CQI and the wideband CQI of each subband. In this way, the required feedback overhead is smaller than the full feedback in the prior art, so that the amount of information transmitted by the air interface can be reduced, and channel resources can be saved.

 Embodiment 2: In order to enable a person skilled in the art to understand the technical solutions of the embodiments of the present invention in more detail, an embodiment of the present invention provides an indirect channel information feedback method, which is described by taking CQI as an example, and assumes that the feedback condition is Only subband CQIs that are not equal to the wideband CQI are fed back. Specifically, it is necessary to feed back the position of the subband CQI and the difference between it and the wideband CQI.

 The four-level quantization in the prior art is simplified to the quantization of three levels, as shown in Table 3.

 Table 3, indicating the differential CQI value with 2 bits

 The position of the sub-band CQI to be fed back can be arranged in order by sub-bands, indicating whether the feedback condition is satisfied between each sub-band CQI and the wideband CQI to obtain the position of the sub-band CQI satisfying the feedback condition. In this embodiment, a bitmap (bi tmap ) can be fed back. In the bitmap, a first identifier of 1 bit is used at each position, and this embodiment is "1", indicating that the position subband CQI is The wideband CQI is not equal, or the second identifier of 1 bit is used, and this embodiment is "0", indicating that the position subband CQI is equal to the wideband CQI.

Determining the difference between the subband CQI and the wideband CQI may be indicated by 1 bit. In this embodiment, for the subband CQI requiring feedback, that is, for the subband CQI identified as "1", use "0"" Or "1" indicates the difference from the wideband CQI, as >1 or -1 in Table 3.

 It is assumed that the bitmap of the feedback in this embodiment is as shown in FIG.

 In the bitmap of FIG. 3, 4 bits of the first field are the feedback wideband CQI, and 5 to 18 bits of the second field are the relationship of the feedback N-bit sub-band CQI and the wideband CQI, in this embodiment, N=14. . Use "1" to indicate that the position subband CQI is not equal to the wideband CQI, and use "0" to indicate that the position subband CQI is equal to the wideband CQI. It should be noted that in the present embodiment, "1" "0" is indicated, but the embodiment of the present invention is not limited thereto, and other indication methods may be used.

 Thus, it can be concluded that the CQI of the sub-bands 1, 4, 6, 7, 8, 12, 14 is different from the wide-band CQI, and there are seven, and M=7.

 The Ί bit of the third field indicates the difference relationship between the 7 subband CQIs and the wideband CQI, and each subband CQI difference is indicated by 1 bit, that is, the 18th to 25th bits in the bitmap of Fig. 3. As shown in Table 3, in the present embodiment, "0" is used to indicate >1, and "1" is used to indicate -1. It should be noted that, in this embodiment, it is represented by "1" "0", and the embodiment of the present invention is not limited thereto, and other indication manners may be used.

 Therefore, according to the "0" of the 19th bit of the bit, the difference between the CQI of the subband 1 and the wideband CQI can be obtained > 1; the CQI of the subband 4 can be obtained according to the "0" of the 20th bit of the bit. The difference between the CQI and the wideband CQI is >1; according to the "1" of the 21st bit of the bit, the difference -1 between the CQI of the subband 6 and the wideband CQI can be obtained; "1" according to the 22nd bit of the bit It can be obtained that the difference between the CQI of the sub-band and the wideband CQI is -1; according to the "0" of the 23rd bit of the bit, the difference between the CQI of the sub-band 8 and the wideband CQI can be obtained >1; The "0" bit of the 24th bit can be obtained as the difference between the CQI of the sub-band 12 and the wideband CQI >1; according to the "1" of the 25th bit of the bit, the CQI of the sub-band 14 and the wideband CQI can be obtained. The difference _1.

 After receiving the above bitmap, the eNB first obtains a wideband CQI according to a design rule, and then obtains information about whether each subband CQI and the wideband CQI are equal, and the obtained M bits are respectively arranged to a position of 1 in the first N bits, to obtain those Subband CQI that is not equal to wideband CQI.

Specifically, the eNB fills the value of the subband CQI equal to the wideband CQI with the wideband CQI, and then according to the difference between the obtained subband CQI of the unequal subband and the wideband CQI, and the positions of the subbands, Get self-to-CQIs that are not equal to wideband CQI.

 The CQI overhead required by the feedback method provided by the embodiment of the present invention is overhead=4+N+M bits, and M represents the number of subbands that need to be fed back, which is not equal to the wideband CQI, and obviously M<N, thus 4+N+M< 2N. In the present embodiment, N=14 is used as an example, and the prior art requires 32 bits, and the scheme only needs 4+14+7=25 bits on average. From the number of bits occupied by the feedback, the indirect channel information feedback method provided by the embodiment of the present invention is known. The air interface resource overhead is saved and the channel resources are saved compared to the prior art.

 Embodiment 3: In order to enable a person skilled in the art to understand the technical solutions of the embodiments of the present invention in more detail, an embodiment of the present invention provides an indirect channel information feedback method, which is described by taking CQI as an example, and assumes that the feedback condition is Only subband CQIs that are not equal or have a large difference with the wideband CQI are fed back. In other words, subbands that are equal or close to the wideband CQI value do not feed back. Here, the larger difference may be that the absolute value of the difference exceeds a predetermined threshold, and the difference is considered to be large. Specifically, it is required to feedback the position of the sub-band CQI having a large difference from the wideband CQI and the difference between it and the wideband CQI. In the present embodiment, the preset threshold value is 1. The sub-band CQI is close to the wideband CQI, which means that the difference between the sub-band CQI and the wideband CQI is 1 or more, and the difference is considered to be large. See Table 4 for details.

 Of course, it can be understood that, in another embodiment, the preset threshold can also be set to other values, such as 3, and the subband CQI is set to be close to the wideband CQI to be ± 1, ± 2, ± 3 Sub-band CQI or above, it is considered that the difference is large. Of course, the preset threshold may not be an integer. For example, the difference between the sub-band CQI and the wideband CQI is ±1.5 or other values, which is not specifically limited in the embodiment of the present invention.

 The 4-step quantization in the prior art is simplified to the quantization of 3 levels, as shown in Table 4 (of course, as described above, the offset in Table 4 can also be set to other values in another embodiment, the present invention The embodiment is not particularly limited).

 Subband differential CQI value offset

 Ox 0, ± 1

10 > 2

 Table 4. Indicates the differential CQI value with 2 bits.

 The position of the sub-band CQI to be fed back can be arranged in order by sub-bands, indicating whether the feedback condition is satisfied between each sub-band CQI and the wideband CQI to obtain the position of the sub-band CQI satisfying the feedback condition. In this embodiment, a bitmap may be fed back. In the bitmap, a first identifier of 1 bit is used at each position, and this embodiment is "1", indicating that the position subband CQI and the broadband The CQIs are not equal or have a large difference, or a second identifier of 1 bit, which is "0" in this embodiment, indicating that the position subband CQI is equal to or smaller than the wideband CQI.

 Determining the difference between the subband CQI and the wideband CQI may be indicated by 1 bit. In this embodiment, for the subband CQI requiring feedback, that is, for the subband CQI identified as "1", use "0" " or "1" indicates the difference between the wideband CQI and the >2 or -2 in Table 4.

 It is assumed that the bitmap of the feedback in this embodiment is as shown in FIG.

 In the bitmap of FIG. 3, 4 bits of the first field are the feedback wideband CQI, and 5 to 18 bits of the second field are the relationship of the feedback N-bit sub-band CQI and the wideband CQI, in this embodiment, N=14. . Use "1" to indicate that the position subband CQI is not equal to or wider than the wideband CQI. The position of the subband CQI is equal to or less than the wideband CQI. It should be noted that, in this embodiment, it is represented by "1" "0", but the embodiment of the present invention is not limited thereto, and other indication manners may be used.

 Therefore, it can be concluded that the CQI of the sub-bands 1, 4, 6, 7, 8, 12, 14 and the wideband CQI are not equal or have a large difference, and there are seven, and M=7.

 The Ί bit of the third field indicates the difference relationship between the 7 subband CQIs and the wideband CQI, and each subband CQI difference is indicated by 1 bit, that is, the 18th to 25th bits in the bitmap of Fig. 3. As shown in Table 4, in the present embodiment, "0" is used to indicate >2, and "1" is used to indicate -2. It should be noted that, in this embodiment, it is represented by "1" "0", and the embodiment of the present invention is not limited thereto, and other indication manners may be used.

Therefore, according to the "0" of the 19th bit of the bit, the difference between the CQI of the subband 1 and the wideband CQI can be obtained >2; the CQI of the subband 4 can be obtained according to the "0" of the 20th bit of the bit. The difference from the wideband CQI is >2; the CQI and wideband CQI of the subband 6 can be derived from the "1" of the 21st bit of the bit. The difference between -2; according to the "1" of the 22nd bit of the bi t bit, the difference -2 between the CQI of the subband and the wideband CQI can be obtained; according to the "0" of the 23rd bit of the bit The difference between the CQI and the wideband CQI of the subband 8 is >2; according to the "0" of the 24th bit of the bi t bit, the difference between the CQI of the subband 12 and the wideband CQI can be obtained >2; The "1" of the 25th bit of the bit can be used to obtain the difference _2 between the CQI of the sub-band 14 and the wideband CQI.

 After receiving the above bitmap, the eNB first obtains a wideband CQI according to a design rule, and then obtains information about whether each subband CQI and the wideband CQI are equal or have a small difference, and the last obtained M bits are respectively arranged in the first N bits. The position is obtained for those subband CQIs that are not equal or have a large difference from the wideband CQI.

 The CQI overhead required by the feedback method provided by the embodiment of the present invention is overhead=4+N+M bits,

M represents the number of subbands that need to be fed back, which is not equal to or different from the wideband CQI. Obviously, M<N, so N+M<2N _{0 is} taken as an example of the implementation N=14, and the prior art requires 32 bits. The scheme only needs 4+14+7=25 bits on average. It can be seen from the number of bits occupied by the feedback that the indirect channel information feedback method provided by the embodiment of the present invention saves the air interface resource overhead and saves channel resources.

In order to enable a person skilled in the art to understand the technical solutions of the embodiments of the present invention in detail, an embodiment of the present invention provides an indirect channel information feedback method, which is described by taking CQI as an example, similar to the above two embodiments, first The 4-bit wideband CQI is fed back, and the feedback " ^lQg2 (representing the rounding up) bit M value is used to indicate the number of subbands that need to be fed back, where N is the number of subbands, in this embodiment N=14, then Here, the "log ₂ 14" bit, that is, 4 bits is needed. Here, the sub-band CQI that needs feedback may be unequal or large difference with the wideband CQI, in other words, equal or similar to the wideband CQI value. The sub-band does not provide feedback, and the relationship that satisfies the feedback can be customized by the user, and is preset as described in the third embodiment, and details are not described herein again.

Embodiment 4: For the position combination of the number of subbands requiring feedback, the position of the subband CQI satisfying the feedback relationship to be fed back is indicated by the corresponding P bit. In one embodiment, P is 2 ^P > d The minimum value, where M is the number of sub-bands that need to be fed back, and is the possible number of positions where these sub-algebras are located. For example, suppose there is a sub-band CQI to be fed back, and its location will have G; ₄ = 14 possibilities, This requires 4 bits to correspond to the indication; assuming there are 3 sub-band CQIs to be fed back, there will be d = 364 possibilities at the location, which requires 9 bits to correspond to the indication. For example, 0000 refers to the first position sub-band CQI requires feedback, 0001 refers to the second position sub-band CQI requires feedback. . . .

 The value of P is shown in Table 5.

 Table 5, the value of P

 Finally, the feedback M bit indicates the difference relationship between the M subband CQIs requiring feedback and the wideband CQI, and the specific difference may be equal to the above embodiment.

After receiving the bitmap, the eNB first obtains the wideband CQI according to the design rule, and then obtains information about how many subband CQIs are different from the wideband CQI, and then obtains the possible number of location combinations according to M, and obtains the position of the subband to be fed back through P, Fill in subbands that do not require feedback with wideband CQI values, and finally Get the subband CQI of the feedback. It can be seen that the CQI overhead required by this method is overhead=4+4+P+M bits. Taking N=14 as an example, the prior art requires 32 bits, and the improvement scheme requires only 23 bits on average, and the bits occupied from the feedback. As can be seen, the present invention saves air interface resource overhead over the prior art.

 Compared with the prior art, the feedback overhead of the second, third, and fourth embodiments is compared with the prior art. As shown in FIG. 4, it can be seen that the second, third, and fourth embodiments save feedback overhead compared with the prior art, and the fourth embodiment has average feedback. The overhead is minimal.

 The user equipment provided by the embodiment of the present invention, as shown in FIG. 5, includes:

 The first feedback unit 502 is configured to feed back a wideband channel quality indicator CQI;

 a second feedback unit 503, configured to feed back a position of the subband with a difference between the subband CQI and the wideband CQI within a predetermined range;

 In the present embodiment, for convenience of description, we divide the difference between the subband CQI and the wideband CQI outside the predetermined range, which is called a feedback condition.

 In one embodiment, as shown in FIG. 14, the second feedback unit 503 can include a first indication feedback module 5031 or a second indication feedback module 5032.

 a first indication feedback module 5031, configured to sequentially arrange by subbands, indicating whether a difference between each subband CQI and the wideband CQI is outside a predetermined range, to obtain the subband CQI and the broadband The difference between the CQI and the position of the sub-band outside the predetermined range, and feedback;

The second indication feedback module 5032 is configured to indicate, by using the “ ^{lQg2 A} ^ bit, the number of subbands whose difference between the subband CQI and the wideband CQI is outside a predetermined range, where N is the number of subbands, “, Indicates rounding up; according to the position combination of the number of subbands, the position of the subband is indicated by a corresponding bit.

Specifically, the second feedback unit 503 may specifically feed back a bitmap. In the bitmap, a first identifier of 1 bit is used at each position to indicate that the position subband CQI satisfies a feedback condition, or a 1-bit number is used. The second flag indicates that the position subband CQI does not satisfy the feedback condition; and the difference between the subband CQI and the wideband CQI satisfying the feedback condition is indicated by 1 bit. That is to say, for each subband satisfying the feedback condition, 1 bit is further used to indicate the difference relationship between each subband CQI and the wideband CQI satisfying the feedback condition. That is, if there are M subbands satisfying the feedback condition, then a common M bit indication satisfies the inverse The difference relationship between the sub-band CQI and the wideband CQI of the feed condition. The specific process is similar to the third or second embodiment of the method, and will not be described again.

 Alternatively, the second feedback unit 503 may specifically feed back a bitmap in which the number of sub-band CQIs that do not satisfy the specific relationship is indicated by "^^ bits, where N is the number of sub-bands; The position of the number is combined, and the position of the sub-band CQI satisfying the feedback condition is indicated by the corresponding bit; for each sub-band satisfying the feedback condition, 1 bit is used to indicate the difference between each sub-band CQI and the wideband CQI satisfying the feedback condition. In other words, if there are M subbands satisfying the feedback condition, then a common M bit is only the difference relationship between the subband CQI and the wideband CQ I satisfying the feedback condition. The specific process is similar to the fourth embodiment of the method. No longer.

 The third feedback unit 504 is configured to feed back a difference between the subband CQI of the subband and the wideband CQI. That is, the difference between the CQI of the subband whose feedback subband CQI and the wideband CQI are outside the predetermined range and the wideband CQI.

 In one embodiment, "the difference between the feedback subband CQI and the wideband CQI" may indicate the difference between the subband CQI and the wideband CQI with 1 bit and feed back.

 In an embodiment, as shown by the dashed box in FIG. 5, the user equipment may further include: a calculating unit 501, configured to estimate, according to the received downlink information, a broadband and a sub-band signal to interference and noise ratio SINR, according to The wideband S INR calculates the wideband CQI, and the CQI corresponding to each subband is calculated according to each subband S INR.

 It should be noted that the user equipment may be a terminal device such as a mobile phone terminal, a notebook computer, or a PDA.

 The user equipment provided by the embodiment of the present invention can only feed back the position of the subband CQI that satisfies the feedback condition, and the difference between the subband CQI and the wideband CQI. In this way, the required feedback overhead is smaller than the full feedback in the prior art, thereby reducing the amount of information transmitted over the air interface and saving channel resources.

 The user equipment provided by the embodiment of the present invention, as shown in FIG. 6, includes:

 A user equipment, comprising:

a fourth feedback unit 602, configured to feed back a wideband channel quality indicator CQI; a fifth feedback unit 603, configured to feed back a position of a subband with a difference between the subband CQI and the wideband CQI within a predetermined range; in this embodiment, for convenience of description, we use a subband CQI and the wideband CQI. The difference is within the predetermined range and is called the feedback condition.

 In an embodiment, as shown in FIG. 15, the fifth feedback unit 603 may include a third indication feedback module 6031 or a fourth indication feedback module 6032.

 a third indication feedback module 6031, configured to sequentially arrange by subbands, indicating whether a difference between each subband CQI and the wideband CQI is within a predetermined range, to obtain the subband CQI and the broadband The difference between the CQI and the position of the sub-band within a predetermined range, and feedback;

The fourth indication feedback module 6032 is configured to use “ ^{1 (g2 A} ^ bit to indicate the number of subbands in which the difference between the subband CQI and the wideband CQI is within a predetermined range, where N is the number of subbands, ", indicating rounding up; according to the position combination of the number of subbands, the position of the subband is indicated by a corresponding bit.

 Specifically, the second feedback unit 603 may specifically feed back a bitmap. In the bitmap, a first identifier of 1 bit is used at each position to indicate that the position subband CQI satisfies a feedback condition, or a 1-bit number is used. The second flag indicates that the position subband CQI does not satisfy the feedback condition; for each subband that does not satisfy the feedback condition, 1 bit is used to indicate the difference relationship between each subband CQI and the wideband CQI that satisfy the non-feedback condition. That is, if there are M subbands that do not satisfy the feedback condition, a common M bit indicates the difference relationship between the subband CQI and the wideband CQI satisfying the feedback condition.

Alternatively, the second feedback unit 603 may specifically feed back a bitmap in which " ^{1 (} ^ ^ bits indicate the number of sub-band CQIs that do not satisfy the specific relationship, where N is the number of sub-bands; The position of the number is combined, and the position of the sub-band CQI satisfying the feedback condition is indicated by the corresponding bit; for each sub-band that does not satisfy the feedback condition, 1 bit is used to indicate each sub-band CQI and wideband CQI satisfying the non-feedback condition. That is, if there are M subbands that do not satisfy the feedback condition, a common M bit indicates the difference relationship between the subband CQI and the wideband CQI satisfying the feedback condition.

The sixth feedback unit, 603, is configured to feed back a difference between a CQI of the subband whose subband CQI and the wideband CQI are outside a predetermined range and the wideband CQI. In an embodiment, as shown by the dotted line in FIG. 6, the user equipment may further include: a calculating unit 601, configured to estimate, according to the received downlink information, a broadband and a sub-band signal to interference and noise ratio SINR, according to the broadband The SINR calculates the wideband CQI, and calculates the CQI corresponding to each subband according to each subband SINR.

 It should be noted that the user equipment may be a terminal device such as a mobile phone terminal, a notebook computer, or a PDA.

 The user equipment provided by the embodiment of the present invention can only feed back the position of the subband CQI that satisfies the feedback condition, and the difference between the subband CQI and the wideband CQI. In this way, the required feedback overhead is smaller than the full feedback in the prior art, thereby reducing the amount of information transmitted over the air interface and saving channel resources.

 The embodiment of the invention provides a method for receiving indirect channel information, as shown in FIG. 7, which includes:

 S701. Receive a broadband channel quality indicator CQI of user feedback;

 S702. Receive a position of a subband whose subband CQI fed back by the user equipment and the broadband CQI are outside a predetermined range.

 S703: Receive a difference between the subband CQI of the subband and the wideband CQI fed back by the user equipment.

 S704, calculating, according to the difference between the subband CQI of the subband and the wideband CQI fed back by the user equipment, and the wideband CQI, calculating, that the difference between the subband CQI and the wideband CQI is outside a predetermined range. Subband CQI;

 5705. The CQI of the subband with the difference between the subband CQI calculated in step S704 and the wideband CQI is outside a predetermined range, and the difference between the received subband CQI and the wideband CQI is out of range. Position of the sub-band;

 5706. Fill the broadband CQI received in step S701 to the remaining sub-band positions.

According to the foregoing technical solution, the user equipment feeds back the position of the subband with the difference between the subband CQI and the wideband CQI within a predetermined range; and the subband of the feedback subband CQI and the wideband CQI with a difference outside the predetermined range. The difference between the CQI and the wideband CQI does not require full feedback of the difference between the CQI and the wideband CQI of each subband. In this way, the required feedback overhead is smaller than the full feedback in the prior art. Thereby, the amount of information transmitted by the air interface can be reduced, and channel resources can be saved.

 The embodiment of the invention provides a method for receiving indirect channel information, as shown in FIG. 8, which includes:

 S710. Receive a broadband channel quality indicator CQI fed back by the user equipment.

 S720. Receive a position of a subband with a difference between a subband CQI fed back by the user equipment and the broadband CQI within a predetermined range.

 S730. Receive a difference between a subband CQI of the subband CQI fed back by the user equipment and the wideband CQI, and a difference between the subband CQI and the wideband CQI outside the predetermined range.

 S740, the difference between the subband CQI and the wideband CQI of the difference between the subband CQI and the wideband CQI fed back by the user equipment and the wideband CQI received in step S710 according to the step S730, and the broadband CQI received in step S710, The CQI of the subband whose difference between the subband CQI and the wideband CQI is outside the predetermined range is calculated.

 S750, filling the broadband CQI received in step S710 to the subband position where the difference between the received subband CQI and the wideband CQI received in step S720 is within a predetermined range;

 S760: Fill the subband CQI whose subband CQI and the wideband CQI calculated in step S740 are outside a predetermined range to the remaining subband positions.

 According to the foregoing technical solution, the user equipment feeds back the position of the subband with the difference between the subband CQI and the wideband CQI within a predetermined range; and the subband of the feedback subband CQI and the wideband CQI with a difference outside the predetermined range. The difference between the CQI and the wideband CQI does not require full feedback of the difference between the CQI and the wideband CQI of each subband. In this way, the required feedback overhead is smaller than the full feedback in the prior art, thereby reducing the amount of information transmitted over the air interface and saving channel resources.

 An embodiment of the present invention provides a receiving device, as shown in FIG. 9, including:

 The first receiving unit 801 is configured to receive a broadband channel quality indicator CQI for receiving user feedback;

 a second receiving unit 802, configured to receive a position of a subband whose subband CQI fed back by the user equipment and the broadband CQI are outside a predetermined range;

The third receiving unit 803 is configured to receive a difference between the subband CQI of the subband and the wideband CQI fed back by the user equipment. In another embodiment, the receiving device further includes:

 a first calculating unit 804, configured to calculate, according to a difference between the subband CQI of the subband and the wideband CQI and a wideband CQI fed back by the user equipment, a difference between the subband CQI and the wideband CQI CQI of subbands outside the predetermined range;

 a first padding unit 805, configured to use the subband CQI calculated by the first calculating unit 804, and fill the subband with the difference between the subband CQI received by the second receiving unit 802 and the wideband CQI being outside a predetermined range. Position

 The second padding unit 806 is configured to fill the wideband CQI received by the first receiving unit 801 to the remaining subband positions.

 It should be noted that the receiving device may be in the form of a base station, a NodeB, an eNodeB, a relay station, a relay node, and the like.

 The embodiment of the present invention receives, by using the foregoing technical solution, a location of a subband with a difference between a subband CQI and a wideband CQI fed back by the user equipment, and a difference between the subband CQI and the wideband CQI that receives the feedback is outside a predetermined range. The difference between the CQI of the subband and the wideband CQI does not require full feedback of the difference between the CQI and the wideband CQI of each subband. In this way, the required feedback overhead is smaller than the full feedback in the prior art, thereby reducing the amount of information transmitted over the air interface and saving channel resources.

 An embodiment of the present invention provides a receiving device, as shown in FIG. 10, including:

 a fourth receiving unit 810, configured to receive a wideband channel quality indicator CQI fed back by the user equipment, and a fifth receiving unit 820, configured to receive a subband with a difference between the subband CQI and the wideband CQI fed back by the user equipment within a predetermined range. s position;

 The sixth receiving unit 830 is configured to receive a difference between the subband CQI and the wideband CQI whose difference between the subband CQI fed back by the user equipment and the wideband CQI is outside a predetermined range.

 In an embodiment, the receiving device further includes:

The second calculating unit 840 is configured to calculate, according to a difference between the subband CQI and the wideband CQI of the difference between the subband CQI and the wideband CQI fed back by the user equipment, and the wideband CQI, The CQI of the subband whose subband CQI and the wideband CQI are outside the predetermined range. a third padding unit 850, configured to fill the wideband CQI received by the fourth receiving unit 810 to a subband position in which the difference between the subband CQI and the wideband CQI received by the no receiving unit 820 is within a predetermined range on;

 The fourth filling unit 860 is configured to fill the sub-band CQI calculated by the second calculating unit 840 to the remaining sub-band position.

 It should be noted that the receiving device may be in the form of a base station, a NodeB, an eNodeB, a relay station, a relay node, and the like.

 The embodiment of the present invention receives, by using the foregoing technical solution, a position of a subband in which a difference between a subband CQ I and a wideband CQI fed back by a user equipment is within a predetermined range; and a difference between a subband CQI and a wideband CQI that receives the feedback is in a predetermined range. The difference between the CQI of the outer subband and the wideband CQI does not require full feedback of the difference between the CQI and the wideband CQI of each subband. In this way, the required feedback overhead is smaller than the full feedback in the prior art, thereby reducing the amount of information transmitted over the air interface and saving channel resources.

 The communication system provided by the embodiment of the present invention, as shown in FIG. 11, includes:

 The user equipment 901 is configured to estimate the broadband and each sub-band signal to interference and noise ratio S INR according to the received downlink information, calculate a wideband CQI according to the wideband S INR, and calculate a CQI corresponding to each subband according to each subband S INR ; Transmitting a wideband CQI to the receiving device 902, feeding back a position of the subband CQI satisfying the feedback condition, and a difference between the subband CQI and the wideband CQI;

 The receiving device 902 is configured to receive the broadband CQI and the subband CQ I fed back by the user equipment 901; determine a position of the subband CQI of the feedback and a difference between the subband CQI and the wideband CQI.

 The user equipment 901 and the receiving device 902 are the same as those of the foregoing embodiments, and are not described here.

 It should be noted that the receiving device may be in the form of a base station, a NodeB, an eNodeB, a relay station, a relay node, and the like. It should be noted that the user equipment may be a terminal device such as a mobile phone terminal, a notebook computer, or a PDA.

According to the foregoing technical solution, the subband of the feedback subband CQI and the wideband CQI is outside the predetermined range, or the subband of the feedback subband CQ I and the wideband CQ I is within a predetermined range. And the difference between the CQI and the wideband CQI of the subband whose feedback subband CQI and the wideband CQI are outside the predetermined range, and does not need to fully feed back the difference between the CQI and the wideband CQI of each subband. In this way, the required feedback overhead is smaller than the full feedback in the prior art, thereby reducing the amount of information transmitted over the air interface and saving channel resources.

 A person skilled in the art can understand that all or part of the process of implementing the above embodiment method can be completed by a computer program to instruct related hardware, and the program can be stored in a computer readable storage medium, the program When executed, the flow of an embodiment of the methods as described above may be included. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

 The above is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention. It should be covered by the scope of the present invention. Therefore, the scope of the invention should be determined by the scope of the claims.

Claims

Rights request An indirect channel information feedback method, comprising:  Feedback wideband channel quality indication CQI;  Transmitting a position of a subband with a difference between the subband CQI and the wideband CQI within a predetermined range; a difference between a feedback subband CQI and the wideband CQI between a CQI of a subband outside a predetermined range and the wideband CQI The difference.  2. The indirect channel information feedback method according to claim 1, wherein the difference between the subband CQI and the wideband CQI is outside a predetermined range:  The subband CQI is not equal to the wideband CQI, or  The difference between the subband CQI and the wideband CQI exceeds a preset threshold.  The indirect channel information feedback method according to claim 3, wherein the method further comprises:  The sub-band CQI is not equal to the wideband CQI with a minimum of 1 bit, or the difference between the sub-band CQI and the wideband CQI exceeds a preset threshold.  The indirect channel information feedback method according to claim 1, wherein the position of the subband whose difference between the feedback subband CQI and the wideband CQI is outside a predetermined range includes:  Arranging sequentially by subbands, indicating whether a difference between each subband CQI and the wideband CQI is outside a predetermined range, to obtain a difference between the subband CQI and the wideband CQI within a predetermined range The position of the sub-band, and feedback.  The indirect channel information feedback method according to claim 4, wherein the indicating whether the difference between each subband CQI and the wideband CQI is outside a predetermined range includes: using a minimum of 1 bit The first identifier indicates that the difference between the subband CQI and the wideband CQI is outside a predetermined range, or the second identifier with a minimum of 1 bit indicates that the difference between the subband CQI and the wideband CQI is within a predetermined range. . 6. The indirect channel information feedback method according to claim 1, wherein the inverse And determining, by the “log ₂ N1 bit, the difference between the subband CQI and the wideband CQI is outside a predetermined range, by using a “log ₂ N1 bit”, where the difference between the subband CQI and the wideband CQI is within a predetermined range. The subband has a number, where N is the number of subbands, ", indicating rounding up; according to the position combination of the number of subbands, the position of the subband is indicated by a corresponding bit.  The indirect channel information feedback method according to claim 1, wherein the feedback of the difference between the subband CQI and the wideband CQI includes:  The difference between the subband CQI and the wideband CQI is indicated with a minimum of 1 bit and fed back.  8. An indirect channel information feedback method, comprising:  Feedback wideband channel quality indication CQI;  Transmitting a position of a subband of a subband CQI and the wideband CQI within a predetermined range; and a difference between a feedback subband CQI and the wideband CQI between a CQI of a subband outside a predetermined range and the wideband CQI The difference. The indirect channel information feedback method according to claim 8, wherein the position of the subband whose difference between the feedback subband CQI and the wideband CQI is within a predetermined range includes:  Arranging sequentially by subbands, indicating whether a difference between each subband CQI and the wideband CQI is within a predetermined range, to obtain a difference between the subband CQI and the wideband CQI within a predetermined range The position of the sub-band, and feedback.  The indirect channel information feedback method according to claim 8, wherein the position of the subband whose difference between the feedback subband CQI and the wideband CQI is within a predetermined range includes: Using " ^{lQg2 A} ^ bit to indicate the number of subbands in which the difference between the subband CQI and the wideband CQI is within a predetermined range, where N is the number of subbands, ", indicating rounding up; according to the sub A combination of positions with a number indicates the position of the sub-band with a corresponding bit.  11. A user equipment, comprising:  a first feedback unit, configured to feed back a wideband channel quality indicator CQI; a second feedback unit, configured to feed back a position of a subband whose difference between the subband CQI and the wideband CQI is outside a predetermined range; And a third feedback unit, configured to feed back a difference between a CQI of the subband whose subband CQI and the wideband CQI are outside a predetermined range and the wideband CQI.  The user equipment according to claim 11, wherein the second feedback unit comprises: a first indication feedback module or a second indication feedback module,  The first indication feedback module is configured to be sequentially arranged by subbands, indicating whether a difference between each subband CQI and the wideband CQI is outside a predetermined range, to obtain the subband CQI and the The difference between the wideband CQI and the position of the subband outside the predetermined range, and feedback; The second indication feedback module is configured to use “ ^{1 (} 2^ bits) to indicate the number of subbands whose difference between the subband CQI and the wideband CQI is outside a predetermined range, where N is the number of subbands, ", indicating rounding up; according to the position combination of the number of subbands, the position of the subband is indicated by a corresponding bit.  13. A user equipment, comprising:  a fourth feedback unit, configured to feed back a wideband channel quality indicator CQI;  a fifth feedback unit, configured to: feed back a position of a subband with a difference between the subband CQI and the wideband CQI within a predetermined range; and a sixth feedback unit, where a difference between the feedback subband CQI and the wideband CQI is predetermined The difference between the CQ I of the out-of-range subband and the wideband CQ I. The user equipment according to claim 13, wherein the fifth feedback unit comprises: a third indication feedback module or a fourth indication feedback module;  The third indication feedback module is configured to be sequentially arranged by subbands, indicating whether a difference between each subband CQI and the wideband CQI is within a predetermined range, to obtain the subband CQI and the The difference between the wideband CQI and the position of the subband within a predetermined range, and feedback; The fourth indication feedback module is configured to indicate, by using the ^{tog2 A} ^ bit, the number of subbands in which the difference between the subband CQI and the wideband CQI is within a predetermined range, where N is the number of subbands, , indicating rounding up; according to the position combination of the number of subbands, the position of the subband is indicated by a corresponding bit.  15. An indirect channel information receiving method, comprising: Receiving a broadband channel quality indicator CQI fed back by the user equipment; Receiving, by the user equipment, the position of the subband CQ I and the broadband CQ I that are different from the broadband CQ I;  And receiving, by the user equipment, a difference between a CQI of the subband CQ I and the wideband CQ I that is outside a predetermined range and a difference between the CQI of the subband and the wideband CQI.  The indirect channel information feedback receiving method according to claim 15, wherein the method further comprises:  Calculating, according to a difference between the subband CQI of the subband and the wideband CQI fed back by the user equipment, and a wideband CQI, calculating a subband whose difference between the subband CQI and the wideband CQI is outside a predetermined range CQI.  The indirect channel information feedback receiving method according to claim 16, wherein the method further comprises:  And calculating a CQI of the subband whose difference between the calculated subband CQI and the wideband CQ I is outside a predetermined range, and filling the difference between the received subband CQ I and the wideband CQ I by a range Sub-band position;  The wideband CQI is padded to the remaining subband locations.  18. An indirect channel information receiving method, comprising:  Receiving a broadband channel quality indicator CQI fed back by the user equipment;  Receiving, by the user equipment, the subband CQ I and the broadband CQ I have a difference in the position of the subband within a predetermined range;  Receiving a subband of the subband CQ I fed back by the user equipment and the broadband CQ I having a difference outside the predetermined range The difference between the CQI and the wideband CQI.  The indirect channel information feedback receiving method according to claim 18, wherein the method further comprises: Calculating the subband CQI and the wideband CQI according to the difference between the subband CQI and the wideband CQI of the difference between the subband CQ I and the wideband CQ I fed back by the user equipment and the wideband CQI The CQ I of the subband whose difference is outside the predetermined range. The indirect channel information feedback receiving method according to claim 19, wherein the method further comprises:  And filling the wideband CQI into a subband position where a difference between the received subband CQI and the wideband CQI is within a predetermined range;  The calculated sub-band CQI whose difference between the sub-band CQI and the wideband CQI is outside the predetermined range is filled to the remaining sub-band positions.  A receiving device, comprising:  a first receiving unit, configured to receive a broadband channel quality indicator CQ I for receiving user feedback;  a second receiving unit, configured to receive a position of the subband with a difference between the subband CQI fed back by the user equipment and the broadband CQI within a predetermined range;  And a third receiving unit, configured to receive a difference between a CQI of the subband and a wideband CQI of the subband with which the difference between the subband CQ I and the wideband CQI fed back by the user equipment is within a predetermined range.  The receiving device according to claim 21, wherein the receiving device further comprises: a first calculating unit, configured to: according to the subband CQI of the subband and the broadband CQI fed back by the user equipment a difference between the difference between the subband CQI and the wideband CQI and a CQI of the subband having a difference between the subband CQI and the wideband CQI;  a first padding unit, configured to fill the subband CQ I calculated by the first calculating unit to a subband position where a difference between the received subband CQI and the wideband CQI is outside a predetermined range;  And a second filling unit, configured to fill the wideband CQI to the remaining subband positions.  23. A receiving device, comprising:  a fourth receiving unit, configured to receive a broadband channel quality indicator CQI fed back by the user equipment;  a fifth receiving unit, configured to receive a position of the subband with a difference between the subband CQI fed back by the user equipment and the wideband CQI within a predetermined range;  And a sixth receiving unit, configured to receive a difference between the subband CQI fed back by the user equipment and the wideband CQI, and a difference between the subband CQI outside the predetermined range and the broadband CQ I. The receiving device according to claim 23, wherein the receiving device further comprises: a second calculating unit, configured to calculate, according to a difference between the subband CQI and the wideband CQI of the difference between the subband CQI and the wideband CQI fed back by the user equipment, and the wideband CQI, The CQI of the subband with a difference between the CQI and the wideband CQI outside the predetermined range.  a third padding unit, configured to fill the wideband CQI to a subband position where a difference between the received subband CQI and the wideband CQI is within a predetermined range;  And a fourth filling unit, configured to fill the sub-band CQI calculated by the second calculating unit to the remaining sub-band position.  A communication system, comprising: a user equipment according to any one of claims 13 - 16 and a receiving device according to any one of claims 25 - 28.