WO2010040287A1

WO2010040287A1 - Channel quality indication feedback method and receiver

Info

Publication number: WO2010040287A1
Application number: PCT/CN2009/072278
Authority: WO
Inventors: 彭爱华; 赵楠; 朱常青; 梁枫; 李峰; 王斌
Original assignee: 中兴通讯股份有限公司
Priority date: 2008-10-10
Filing date: 2009-06-15
Publication date: 2010-04-15
Also published as: CN101729474A; CN101729474B

Abstract

A channel quality indication (CQI) feedback method and receiver are provided. The method includes that the receiver feeds back positions and an average value of CQI of continuous resource blocks of a whole frequency band to a transmitter. The continuous resource blocks are adjacent resource blocks that the difference value of their CQI is less than or equal to a predetermined value.

Description

Channel quality index feedback method and receiver

TECHNICAL FIELD The present invention relates to the field of communications, and in particular, to a channel quality index feedback method and receiver. Background Art In the related art, a Channel Quality Indication (CQI) is channel condition information that a receiver in a communication system feeds back to a transmitter. After the transmitter receives the CQI fed back by the receiver, the transmitter corresponds the CQI information fed back by the receiver to a certain transmission block size, coding mode, and modulation mode, and based on the CQI information, performs resources for the receiver. Assignment and scheduling. The true degree of the channel that the CQI information can reflect and the overhead of the uplink consumed by the feedback will have a large impact on system performance. In practical applications, the realism of the channel and the resources consumed by the feedback reflected by the CQI information are contradictory. If it is necessary to reflect the channel as realistically as possible, a full feedback strategy may be adopted, that is, each scheduling on the entire working frequency band is fed back. The channel quality information of the unit, however, this will result in a relatively large overhead. For example, for a 10M bandwidth communication system, an Orthogonal Frequency Division Multiplexing (OFDM) technology is used to divide the entire frequency band into 600 subcarriers, and every 12 subcarriers serve as one resource block. It can be divided into 50 resource blocks. If each resource block is used as a scheduling unit, then 50 CQI values are needed to reflect the channel quality of each resource block in the entire frequency band. Therefore, more uplinks are consumed. Overhead. At present, various feedback methods are proposed for CQI, including the following: 1. Average

CQI feedback: feedback an average CQI value in the entire transmission bandwidth; 2. Full CQI feedback: feedback CQI value of all resource blocks in the entire bandwidth; 3. CQI feedback of optimal M resource blocks: feedback M maximum CQI values The location information of the resource block in which it resides, and the average CQI value on other resource blocks; 4. CQI mean feedback of the optimal M resource blocks: feedback the mean value of the M largest CQI values, and the location information of the resource block in which it is located And the average CQI value on other resource blocks; 5. CQI feedback of the group optimal M resource blocks: The packet is cyclically used, and the CQI of the optimal M resource blocks in a group is reported each time; Threshold-based CQI feedback: Based on the CQI value in the full frequency band measured by each receiver, the average value of the CQI values included in the highest CQI value and the CQI threshold is calculated, and the average CQI value and the position information feedback of these CQI values are fed back. To the transmitter; 7, differential CQI Feedback: Each time an absolute CQI value and a differential CQI value of other resource blocks are fed back (1-bit); wherein the calculation of the differential CQI bit can be divided into two types: calculating differential information in the frequency domain and calculating differential information in the time domain. Mode; 8. Hierarchical continuous resource block CQI feedback: The entire transmission bandwidth is divided into several levels. The CQI feedback information includes level information, resource block information, and CQI value information. 9. Hierarchical discontinuous resource block CQI feedback: CQI feedback The information includes a bitmap of the resource block and a CQI value, wherein the bitmap gives the location of the resource block corresponding to the CQI value. Currently, in the Long Term Evolution (LTE) system, the specified feedback algorithm divides successive resource blocks into sub-bands in order, and then feeds back according to the CQI of the sub-band. Although consecutive resource blocks may have similar channel characteristics, it is not excluded that resource blocks with two CQI values that differ greatly may be divided into one sub-band, and resource blocks with smaller or equal CQI values are divided into two. The situation within different sub-bands. In the above case, the scheduler (transmitter) performs the assignment of the transmission rate and the modulation and coding mode according to the channel quality of the worst-quality resource block in the continuous resource block, so that the resource block with better channel quality cannot be played. Its advantages, thereby reducing the utilization of resource blocks. However, no technical solution has been proposed to effectively solve the above problems. SUMMARY OF THE INVENTION The present invention has been made in view of the problem in the prior art that a resource block having a large difference in CQI values may be allocated to one sub-band for feedback, resulting in a low utilization rate of resource blocks, and the main object of the present invention is to A channel quality index feedback method and receiver are provided to solve the above problems in the related art. According to an aspect of the present invention, a channel quality index feedback method is provided for a receiver to feed back a channel quality index of a continuous resource block to a transmitter. A channel quality index feedback method according to the present invention includes: a receiver feeding back to a transmitter, position information of consecutive resource blocks in an entire frequency band, and an average channel quality index value of a continuous resource block, wherein the continuous resource block is a channel quality index value thereof An adjacent resource block whose difference is less than or equal to a predetermined value. Preferably, before the receiver provides feedback to the transmitter, the method further comprises: determining the predetermined value by the receiving channel environment and/or the simulated scene condition. Preferably, the processing performed by the receiver by the feedback further comprises: using, by the receiver, location information of the predetermined number of bit pairs of consecutive resource blocks, and the number of consecutive resource blocks included in the location information. Information is identified. Preferably, before the receiver provides feedback to the transmitter, the method further includes: receiving, determining, by the channel quality index value of each resource block in the entire frequency band, a continuous resource block; determining more than one continuous resource block at the receiver In the case that the receiver selects the continuous resource block including the largest number of resource blocks for feedback; if the receiver selects more than one consecutive resource blocks including the largest number of resource blocks, the receiver selects the average channel quality index value. The largest continuous resource block performs feedback; if there are multiple consecutive resource blocks with the largest average channel quality index value, a continuous resource block is randomly selected for feedback. Preferably, the method includes: the receiver sets a channel quality index value of other resource blocks except the continuous resource block to a specific value, and feeds back other resource blocks that are set; or the receiver prohibits feedback of other resource blocks. Channel quality index value. Wherein, the specific value is one of the following: zero, an average channel quality index value of the entire frequency band, and a specific value preset according to a network load condition. According to another aspect of the present invention, a receiver is provided for feeding back a channel quality index of a continuous resource block to a transmitter. The receiver according to the present invention includes: a feedback module, configured to feed back, to the transmitter, location information of consecutive resource blocks in the entire frequency band and average channel quality index values of consecutive resource blocks, wherein the continuous resource block is a channel quality index value thereof An adjacent resource block whose difference is less than or equal to a predetermined value. Preferably, the receiver further includes: a determining module, configured to determine a continuous resource block according to a channel quality index value of each resource block in the entire frequency band. Preferably, the determining module further includes: a first selecting module, configured to select a continuous resource block that includes the largest number of resource blocks for feedback; and a second selecting module, configured to select a continuous resource block with the largest average channel quality index value for feedback a third selection module, configured to randomly select one continuous resource block from a plurality of consecutive resource blocks with the largest average channel quality index value for feedback; and call a module, configured to use the first selection module, the second selection module, and the third selection The module makes a call: in the case that more than one consecutive resource blocks are determined, the first selection module is called; in the case where there are more than one consecutive resource blocks having the largest number of resource blocks, the second selection module is called; In the case of a contiguous resource block having the largest average channel quality index value, the third selection module is called. By means of the technical solution of the present invention, the performance of each resource block of the CQI is close to the continuous resource blocks with similar CQI values, so that the resource blocks with poor quality are not affected, and the resource blocks with better quality play their advantages in scheduling. The problem of low utilization of resource blocks is solved, so that resource blocks with better channel quality can better exert their advantages, and the transmitter can allocate higher-order modulation and coding modes and transmission rates, thereby improving resource block utilization. Rate, improve system performance. Other features and advantages of the invention will be set forth in the description which follows, and The objectives and other advantages of the invention will be realized and attained by the <RTI The drawings are intended to provide a further understanding of the invention, and are intended to be a part of the description of the invention. In the drawings: FIG. 1 is a flowchart of a channel quality index feedback method according to an embodiment of the present invention; FIG. 2 is a flowchart of a processing example of a channel quality index feedback method according to an embodiment of the present invention; A block diagram of a receiver of an embodiment of the present invention; FIG. 4 is a block diagram of a determining module of a receiver according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The functional characteristics of each subcarrier are considered in the channel correlation technology, that is, the channel response does not change much within the relevant bandwidth, so the channel quality index (CQI) may be present on adjacent resource blocks. Similar values, the feedback algorithm specified by the LTE system is to divide successive resource blocks into sub-bands in order, and then feedback according to the CQI of the sub-band. However, if the CQI values on adjacent resource blocks differ greatly, and they are scheduled to be divided into one sub-band, it will result in the resource blocks with better performance not being able to exert their advantages, thus generating resource block utilization. The problem of low rates. The present invention improves the above feedback method, so that continuous resource blocks with close CQI values are fed back, and consecutive resource blocks in the entire bandwidth can be accurately represented by a certain number of bits. Therefore, in the CQI feedback, only this continuous feedback can be fed back. The location of the resource and the average CQI value on each resource block. The preferred embodiments of the present invention are described in the following with reference to the accompanying drawings, which are intended to illustrate and illustrate the invention. Method Embodiments According to an embodiment of the present invention, a channel quality index feedback method is provided for a receiver to feed back a channel quality index of a continuous resource block to a transmitter. 1 is a flowchart of a channel quality index feedback method according to an embodiment of the present invention. As shown in FIG. 1, the process includes the following steps: First, receiving according to a CQI value on each resource block (RB) in an entire frequency band The machine finds consecutive RBs with close CQI values. If there are several consecutive RBs, first find consecutive RBs with the largest number of RBs in the consecutive RBs; if there are more than one consecutive RBs, the number of RBs is For the maximum value, the consecutive RB whose average CQI value is the largest is taken. If the number of RBs in the consecutive RBs is equal and the average CQI value is equal, the consecutive RBs with the highest position are taken. In the first step, the average CQI value of the successive RBs found to be found is greater than or equal to the average CQI value of the entire frequency band of the receiver. In the second step, the receiver feeds back to the transmitter the position information of consecutive RBs in the entire frequency band and the average CQI value of consecutive RBs, wherein the consecutive RBs are adjacent RBs whose CQI value difference is less than or equal to a predetermined value ( Delta value). In practical applications, the receiver can determine the predetermined value (Delta value) according to the channel environment and/or the simulated scene conditions. For example, the channel condition changes greatly, and the Delta value can be set when the channel frequency selectivity is strong. Larger; channel conditions change little, and the Delta value is set to be small when the frequency selectivity is not strong. It should be noted that the predetermined value refers to a CQI difference value used to determine a continuous resource block. In the second step, the receiver can identify the location information of the consecutive RBs and the number of consecutive RBs included in the location information using a predetermined number of bits, and thus can be uniquely determined in the feedback. In the second step, the receiver may set the CQI value of the RB other than the consecutive RBs fed back in the entire frequency band to a specific value, or the receiver prohibits the feedback of the CQI values of other RBs. It should be noted that the specific value is used. The pre-set CQI values of the remaining non-contiguous resource blocks are determined. In its When the CQI value of the position RB is set to a specific value, the CQI value of these position RBs can be set to 0, or set to the average CQI value of the entire frequency band, or set to a specific value according to the network load condition. In the third step, the transmitter recovers the CQI value at the feedback position according to the feedback of the receiver. The above technical solutions of the present invention will be described in detail below with reference to specific examples. 2 is a flow chart showing an example of processing of a CQI feedback method according to an embodiment of the present invention. In this example, a CQI feedback method according to the present invention is exemplified by a system having 50 RBs in a 10 M bandwidth. In the above system, the position and length of consecutive RBs can be fully represented by 13 bits. With these characteristics, when CQI feedback is performed in the user equipment (User Equipment, called UE), the feedback has continuous RBs with continuous CQI values and continuous RBs. Average CQI value. As shown in FIG. 2, the following steps are included: In the first step, the UE estimates the average CQI value of the entire frequency band according to the CQI value of each RB in the entire frequency band, and sets the threshold Delta of the similar CQI value to 2; Finding consecutive RBs whose CQI values of adjacent RBs are less than or equal to 2, and the average CQI value of the consecutive RBs is greater than the average CQI value of the entire frequency band, so that n such consecutive RBs are found, and if n = 0, the execution is performed. In the third step, if n = l, the fourth step is performed. If η>1, the fifth step is performed; the third step, if n = 0, the UE feeds back the average CQI value of the entire frequency band; the fourth step, if n = l, the shell 'j UE feeds back the location information of the consecutive RBs, and the average CQI value of the consecutive RBs; Step 5, if n>l, the UE determines how many RBs each of the n consecutive RBs contains, and finds the number of RBs included The most consecutive RBs are provided with k consecutive RBs. If k = 1, the sixth step is performed, otherwise the seventh step is performed. In the sixth step, the UE feeds back the location information of the consecutive RBs having the largest number of RBs, and the The average CQI value of consecutive RBs; In the seventh step, the UE feeds back the top of the k consecutive RBs The position information of the RB (which may also be position information of consecutive RBs randomly selected among K consecutive RBs), and the average CQI value of the consecutive RBs; wherein the first to seventh steps in FIG. 2 correspond to the figure 1 shows the first step and the second step; In the eighth step, the base station recovers the CQI value at the continuous RB position according to the feedback of the UE. If the received feedback information is only one CQI value, the CQI value of each RB in the entire frequency band is set to the CQI value, if the receiving The received feedback information includes a CQI value of the position information of the RB, and the CQI value of these RBs is set as the received CQI value, and the CQI value at the remaining positions is set to zero. It should be noted that the eighth step corresponds to the third step shown in FIG. Through the foregoing processing, it can be seen that the UE feeds back the location information of the consecutive RBs with the CQI value close to and the average CQI value of the consecutive RBs. If the UE does not find the consecutive RBs that meet the conditions, only the average CQI value on the entire frequency band is fed back. . After receiving the feedback from the UE, the base station can allocate the continuous RB to the UE. If the part of the resources cannot meet the service requirements of the UE, the base station allocates resources for the UE in the remaining RBs. This ensures that RBs with close CQI values are allocated to the UE, which improves the utilization of RBs and improves system performance. Apparatus Embodiment According to an embodiment of the present invention, there is provided a receiver for feeding back a CQI of a continuous RB to a transmitter. 3 is a block diagram of a receiver according to an embodiment of the present invention. As shown in FIG. 3, a determination module 30 and a feedback module 32 are included. The receiver is described in detail below. a determining module 30, configured to determine a continuous RB according to a CQI value of each RB in the entire frequency band; in an actual application, the determining module 30 may further use a predetermined number of bit pairs of consecutive RB location information, and consecutive RBs included in the location information The number information is identified, so it can be uniquely determined in the feedback. In addition, the determining module 30 may further include a setting module, configured to set a CQI value of the other location RBs other than the consecutive RBs fed back in the entire frequency band to a predetermined value, or the receiver prohibits feeding back the CQI values of the other RBs. For example, the CQI value of these location RBs can be set to 0, or set to the average CQI value of the entire frequency band, or set to a specific value according to the network load condition. The feedback module 32 is connected to the determining module 30, and is configured to feed back, to the transmitter, location information of consecutive RBs in the entire frequency band and average CQI values of consecutive RBs, where the continuous RB has a difference of CQI values less than or equal to a predetermined value. Adjacent RB. In a practical application, the feedback module 32 may determine a predetermined value (Delta value) according to the channel environment and/or the simulated scene condition, for example, the channel condition changes greatly, and the Delta value may be set when the channel frequency selectivity is strong. Larger; channel conditions change little, and the Delta value is set to be small when the frequency selectivity is not strong. As shown in FIG. 4, the determining module 30 further includes: a first selecting module 40, configured to select a continuous RB that includes the largest number of RBs for feedback; and a second selecting module 42 configured to select a continuous maximum channel quality index value. The RB performs feedback; the third selection module 44 is configured to randomly select one continuous RB from a plurality of consecutive RBs with the largest average channel quality index value for feedback; the calling module 46 is connected to the first selection module 40 and the second selection module 42. The third selection module 44 is configured to invoke the first selection module 40, the second selection module 42, and the third selection module 44: in the case that the determination module 30 determines more than one consecutive resource blocks, the first selection module is invoked. 40. In a case where there are more than one consecutive resource blocks including the largest number of resource blocks, the second selection module 42 is called, and when the maximum average channel quality index values of the plurality of consecutive resource blocks are equal, the third selection is invoked. Module 44. In summary, by means of the technical solution of the present invention, by performing CQI feedback on consecutive resource blocks with similar CQI values, it can be ensured that the CQI values of the resource blocks in the scheduled continuous resource blocks are small, that is, each The performance of resource blocks is closer, so that the resource blocks with poor quality will not affect the better quality resource blocks in scheduling, and the problem of low utilization of resource blocks in related technologies is solved, so that the channel quality is better. A good resource block can better utilize its advantages. The transmitter can allocate higher-order modulation and coding modes and transmission rates, thereby improving resource block utilization and improving system performance. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claim

A channel quality index feedback method, configured for a receiver to feed back a channel quality index of a continuous resource block to a transmitter, wherein the method includes:

Transmitting, by the receiver, location information of consecutive resource blocks in the entire frequency band and an average channel quality index value of the continuous resource block to the transmitter, where the continuous resource block has a difference in channel quality index value thereof is less than Or adjacent resource blocks equal to a predetermined value.

2. The method according to claim 1, wherein before the receiving the feedback to the transmitter, the method further comprises:

The receiving data determines the predetermined value according to a channel environment and/or a simulated scene condition.

The method according to claim 2, wherein the processing of the feedback by the receiver further comprises:

The receiver identifies the location information of the consecutive resource blocks and the number of consecutive resource blocks included in the location information using a predetermined number of bits.

4. The method of claim 3, wherein before the receiving the feedback to the transmitter, the method further comprises:

Determining, by the receiver, the consecutive resource blocks according to channel quality index values of respective resource blocks in the entire frequency band;

Wherein, in a case that the determined consecutive resource blocks are more than one, the receiver selects a continuous resource block that includes the largest number of resource blocks for feedback;

If there are more than one consecutive resource blocks including the largest number of resource blocks, the receiver selects a continuous resource block with the largest average channel quality index value for feedback; if there are multiple consecutive resource blocks with the largest average channel quality index value, then A continuous resource block is randomly selected for feedback.

The method according to claim 1, wherein the method further comprises:

The receiver sets a channel quality index value of other resource blocks except the continuous resource block to a specific value, and feeds back other resource blocks that are set; or

The receiver is prohibited from feeding back channel quality index values of the other resource blocks.

6. The method according to claim 5, wherein the specific value is one of: zero, an average channel quality index value of the entire frequency band, and a specific value set in advance according to a network load condition.

A receiver for feeding back a channel quality index of a continuous resource block to a transmitter, wherein the receiver comprises:

a feedback module, configured to feed back, to the transmitter, location information of consecutive resource blocks in the entire frequency band and an average channel quality index value of the continuous resource block, where the continuous resource block is a difference of channel quality index values thereof An adjacent resource block that is less than or equal to a predetermined value.

The receiver according to claim 7, wherein the receiver further comprises: a determining module, configured to determine the continuous resource block according to a channel quality index value of each resource block in the entire frequency band.

The receiver according to claim 8, wherein the determining module further comprises: a first selecting module, configured to select a continuous resource block that includes the largest number of resource blocks for feedback;

a second selection module, configured to select a continuous resource block with the largest average channel quality index value for feedback;

a third selecting module, configured to randomly select one continuous resource block from a plurality of consecutive resource blocks with the largest average channel quality index value for feedback;

a calling module, configured to invoke the first selection module, the second selection module, and the third selection module: if the determined consecutive resource blocks are more than one, the first selection module is invoked; The second selection module is invoked when there are more than one consecutive resource blocks with the largest number of resource blocks; and the third selection module is called when there are multiple consecutive resource blocks with the largest average channel quality index value.