CN106464445B - The method of adjustment and device of channel quality instruction - Google Patents

The method of adjustment and device of channel quality instruction Download PDF

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Publication number
CN106464445B
CN106464445B CN201580034008.2A CN201580034008A CN106464445B CN 106464445 B CN106464445 B CN 106464445B CN 201580034008 A CN201580034008 A CN 201580034008A CN 106464445 B CN106464445 B CN 106464445B
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groups
subframe
cqi
determining
group
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CN106464445A (en
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李少华
杜静
敖娟
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0033—Systems modifying transmission characteristics according to link quality, e.g. power backoff arrangements specific to the transmitter
    • H04L1/0035—Systems modifying transmission characteristics according to link quality, e.g. power backoff arrangements specific to the transmitter evaluation of received explicit signalling

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The embodiment of the present invention provides the method for adjustment and device of a kind of channel quality instruction.By the way that according to subframe numbers classification information, the UE at least two subframe numbers for reporting ACK/NCK to feed back are divided at least two groups；According to ACK/NCK feedback of the UE in the corresponding subframe of at least two subframe numbers, the corresponding CQI adjustment amount of at least two groups is determined；And the CQI reported according to the corresponding CQI adjustment amount of at least two groups and the UE, determine the corresponding revised CQI of at least two groups；According to the corresponding revised CQI of at least two groups, the corresponding TB index of at least two groups is determined；And the scheduling of transfer resource is carried out according to the corresponding transmission block TB index of at least two groups；To solve the problems, such as to be interfered the corresponding subframe MCS order of lesser subframe numbers lower by adjacent area in serving cell existing in the prior art.

Description

Method and device for adjusting channel quality indication
Technical Field
The present invention relates to communication technologies, and in particular, to a method and an apparatus for adjusting a Channel Quality Indication (CQI).
Background
In order to meet the increasing demand for data services, the third generation Partnership Project (3 GPP) has initiated a Long Term Evolution (LTE) Project, which aims to provide a more powerful data service support and provide better services for users through an evolving 3G system. Key technologies of LTE systems include scheduling and adaptive modulation and coding techniques.
In an LTE system, in order to implement scheduling and adaptive modulation and coding techniques, User Equipment (UE) needs to report CQI according to a downlink pilot signal of a current serving cell, and perform Acknowledgement (ACK)/Negative acknowledgement (Negative acknowledgement) feedback on a subframe. And the base station (namely, the base station to which the serving cell belongs) determines the CQI adjustment amount according to the ACK/NCK reported by the UE on all the subframes, and obtains the corrected CQI according to the CQI adjustment amount and the CQI reported by the UE. The base station determines a Transport Block (TB) index of downlink scheduling corresponding to the UE according to the corrected CQI; finally, the base station schedules the transmission resource according to the TB index. Wherein, the scheduling of the transmission resource by the base station according to the TB index comprises: determining a Modulation and Coding Scheme (MCS) order according to the TB index; determining a TB Size (TBs, TB Size) according to the TB index, the number of Resource Blocks (RBs) allocated to the UE (i.e., the number of available RBs), and the Size of data to be transmitted to the UE; and scheduling transmission resources according to the MCS order and the TBS.
However, in the prior art, when a subframe corresponding to a part of subframe numbers in a serving cell is interfered by a neighboring cell more greatly and a subframe corresponding to another part of subframe numbers is interfered by a neighboring cell less greatly, there is a problem that a subframe MCS order corresponding to a subframe number which is interfered by a neighboring cell less greatly in the serving cell is lower.
Disclosure of Invention
The embodiment of the invention provides a method and a device for adjusting channel quality indication, which are used for solving the problem that the order of a subframe MCS corresponding to a subframe number which is interfered less by an adjacent cell in a serving cell is lower in the prior art.
In a first aspect, an embodiment of the present invention provides a CQI adjustment method, where the method is applied to an LTE system, where the LTE system includes a serving cell where a UE is located and a neighboring cell of the serving cell, and the serving cell and the neighboring cell are time-synchronized; the method is performed by a base station to which the serving cell belongs, and comprises:
acquiring subframe number classification information, wherein the subframe number classification information is used for indicating that interference levels of subframes corresponding to subframe numbers belonging to different classes in the adjacent cell to the serving cell are different;
dividing at least two subframe numbers into at least two groups according to the subframe number classification information; wherein the at least two subframe numbers are subframe numbers of subframes for reporting ACK/negative acknowledgement (NCK) feedback by the UE; of the at least two subframe numbers, subframe numbers in the same group belong to the same category in the subframe number classification information, and subframe numbers in different groups belong to different categories in the subframe number classification information;
determining the at least two groups of CQI adjustment quantities corresponding to the at least two sub-frame numbers respectively according to ACK/NCK feedback of the UE on the sub-frames corresponding to the at least two sub-frame numbers respectively; determining at least two groups of corrected CQI corresponding to the at least two groups of CQI according to the at least two groups of CQI adjustment amounts corresponding to the at least two groups of CQI respectively and the CQI reported by the UE;
determining the TB indexes of the at least two groups of transmission blocks corresponding to each other according to the at least two groups of modified CQI corresponding to each other; and scheduling transmission resources according to the at least two groups of transmission block TB indexes respectively corresponding to the at least two groups.
With reference to the first aspect, in a first possible implementation manner of the first aspect, the obtaining subframe number classification information includes: acquiring the data bearing state of each subframe number of the adjacent cell, and determining the subframe number classification information according to the data bearing state of each subframe number; or acquiring the interference level of the sub-frame corresponding to each sub-frame number of the adjacent cell to the serving cell, and determining the sub-frame number classification information according to the interference level of the sub-frame corresponding to each sub-frame number to the serving cell.
With reference to the first aspect or the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the determining, according to ACK/NCK feedback of the UE on subframes corresponding to the at least two subframe numbers respectively, the at least two groups of CQI adjustment amounts corresponding respectively includes:
and for each group in the at least two groups, determining the CQI adjustment amount of each group according to the ACK/NCK feedback of the UE on the subframe corresponding to the subframe number belonging to each group in the at least two subframe numbers.
With reference to the first aspect or any one of the first to the second possible implementation manners of the first aspect, in a third possible implementation manner of the first aspect, the determining, according to the at least two sets of CQI adjustment amounts corresponding respectively and the CQI reported by the UE, the modified CQIs corresponding respectively to the at least two sets of CQIs includes:
and for each group in the at least two groups, determining the corrected CQI of each group according to the CQI adjustment quantity of each group and the CQI.
With reference to the first aspect or any one of the first to third possible implementation manners of the first aspect, in a fourth possible implementation manner of the first aspect, the scheduling transmission resources according to the at least two groups of respectively corresponding transport block TB indexes includes:
and in the resource block RB allocated to the UE, scheduling transmission resources of the subframes of which subframe numbers belong to any one of the at least two groups according to the TB indexes of the any one group.
In a second aspect, an embodiment of the present invention provides a CQI adjustment apparatus, where the apparatus is applied to a long term evolution LTE system, where the LTE system includes a serving cell where user equipment UE is located and a neighboring cell of the serving cell, and the serving cell and the neighboring cell are time-synchronized; the apparatus is a base station to which the serving cell belongs, and the apparatus includes:
an obtaining module, configured to obtain subframe number classification information, where the subframe number classification information is used to indicate that subframes corresponding to subframe numbers belonging to different classes in the neighboring cell have different interference levels to the serving cell;
the grouping module is used for dividing at least two subframe numbers into at least two groups according to the subframe number classification information; wherein the at least two subframe numbers are subframe numbers of subframes for reporting ACK/negative acknowledgement (NCK) feedback by the UE; of the at least two subframe numbers, subframe numbers in the same group belong to the same category in the subframe number classification information, and subframe numbers in different groups belong to different categories in the subframe number classification information;
a CQI adjustment amount determining module, configured to determine the at least two groups of CQI adjustment amounts corresponding to each other according to ACK/NCK feedback of the UE on subframes corresponding to the at least two subframe numbers respectively; determining at least two groups of corrected CQI corresponding to the at least two groups of CQI according to the at least two groups of CQI adjustment amounts corresponding to the at least two groups of CQI respectively and the CQI reported by the UE;
a scheduling module, configured to determine, according to the at least two groups of modified CQIs corresponding to the at least two groups, corresponding transport block TB indexes of the at least two groups; and scheduling transmission resources according to the at least two groups of transmission block TB indexes respectively corresponding to the at least two groups.
With reference to the second aspect, in a first possible implementation manner of the second aspect, the obtaining module is specifically configured to:
acquiring the data bearing state of each subframe number of the adjacent cell, and determining the subframe number classification information according to the data bearing state of each subframe number; or acquiring the interference level of the sub-frame corresponding to each sub-frame number of the adjacent cell to the serving cell, and determining the sub-frame number classification information according to the interference level of the sub-frame corresponding to each sub-frame number to the serving cell.
With reference to the second aspect or the first possible implementation manner of the second aspect, in a second possible implementation manner of the second aspect, the determining module of CQI adjustment amount determines the at least two groups of CQI adjustment amounts corresponding respectively according to ACK/NCK feedback of the UE on subframes corresponding to the at least two subframe numbers respectively, where the determining module of CQI adjustment amount specifically includes:
and for each group in the at least two groups, determining the CQI adjustment amount of each group according to the ACK/NCK feedback of the UE on the subframe corresponding to the subframe number belonging to each group in the at least two subframe numbers.
With reference to the second aspect or any one of the first to second possible implementation manners of the second aspect, in a third possible implementation manner of the second aspect, the determining a CQI adjustment amount module determines, according to the at least two sets of CQI adjustment amounts corresponding respectively and the CQI reported by the UE, the at least two sets of modified CQIs corresponding respectively, specifically including:
and for each group in the at least two groups, determining the corrected CQI of each group according to the CQI adjustment quantity of each group and the CQI.
With reference to the second aspect or any one of the first to third possible implementation manners of the second aspect, in a fourth possible implementation manner of the second aspect, the scheduling module performs scheduling on transmission resources according to the at least two groups of transport block TB indexes respectively corresponding to the at least two groups, specifically including:
and in the resource block RB allocated to the UE, scheduling transmission resources of the subframes of which subframe numbers belong to any one of the at least two groups according to the TB indexes of the any one group.
According to the adjusting method and device for the channel quality indication provided by the embodiment of the invention, at least two subframe numbers reported by the UE and fed back by the ACK/NCK are divided into at least two groups according to subframe number classification information (the subframe number classification information is used for indicating that the interference levels of subframes corresponding to the subframe numbers belonging to different classes in the adjacent cell to the service cell are different); wherein, the sub-frame numbers in the same group belong to the same category in the sub-frame number classification information, and the sub-frame numbers in different groups belong to different categories in the sub-frame number classification information; determining the at least two groups of CQI adjustment quantities corresponding to the at least two sub-frame numbers respectively according to ACK/NCK feedback of the UE on the sub-frames corresponding to the at least two sub-frame numbers respectively; determining at least two groups of corrected CQI corresponding to the at least two groups of CQI according to the at least two groups of CQI adjustment amounts corresponding to the at least two groups of CQI respectively and the CQI reported by the UE; determining the TB indexes respectively corresponding to the at least two groups according to the corrected CQI respectively corresponding to the at least two groups; scheduling transmission resources according to the at least two groups of transmission block TB indexes respectively corresponding to the at least two groups of transmission blocks; enabling a base station to group the subframe numbers of the subframes of the ACK/NCK reported by the UE according to the subframe number classification information, wherein the interference levels of the subframe numbers in the same group to a service cell are the same, and the interference levels of the subframe numbers in different groups to the service cell are different; respectively determining corresponding CQI adjustment quantities for different groups; the MCS order of the subframe corresponding to the subframe number with less interference of the adjacent cell is prevented from being lowered by the subframe corresponding to the subframe number with greater interference of the adjacent cell in different groups; and the MCS order of the subframe corresponding to the subframe number with less interference of the adjacent region is improved. Therefore, the problem that the order of the MCS of the subframe corresponding to the subframe number with less interference of the adjacent cell is lower in the prior art is solved.
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 description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of an application scenario of a CQI adjustment method according to the present invention;
FIG. 2 is a flowchart illustrating a first embodiment of a CQI adjustment method according to the present invention;
FIG. 3 is a flowchart of a second embodiment of a CQI adjustment method according to the present invention;
FIG. 4 is a relationship curve between SINR and downlink throughput in an external field scenario according to the present invention;
FIG. 5 is a relationship curve between SINR and MCS orders in the external field scenario of the present invention;
FIG. 6 is a schematic structural diagram of a first embodiment of an apparatus for adjusting CQI according to the present invention;
fig. 7 is a schematic structural diagram of a second embodiment of the CQI adjusting apparatus according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic diagram of an application scenario of a CQI adjustment method according to the present invention; as shown in fig. 1, the application scenario includes: a service cell and a neighboring cell of the service cell; when the load of the neighboring cell is light, the interference of the neighboring cell to the serving cell can be reduced by turning off a part of subframe numbers in the neighboring cell, which do not need to send user data (i.e., turning off the power amplifier in a symbol period of the part of subframe numbers). Because part of the subframe numbers of the adjacent cell are turned off, when the time of the serving cell is synchronous with that of the adjacent cell, a scene exists in which the interference of the adjacent cell on the subframe corresponding to the part of the subframe numbers in the serving cell is small, and the interference of the adjacent cell on the subframe corresponding to the other part of the subframe numbers in the serving cell is large. The number of NCKs fed back on the subframe corresponding to the part of subframe numbers which are interfered by the adjacent cell greatly in the serving cell is more than the number of NCKs fed back on the subframe corresponding to the part of subframe numbers which are interfered by the adjacent cell less, and the CQI adjustment amount is smaller when the number of NCKs is more, and the corresponding MCS order is smaller; therefore, the CQI is uniformly adjusted by adopting the ACK/NCK feedback on the subframes corresponding to all the subframe numbers reported by the UE in the prior art, and the MCS order of the subframe corresponding to the subframe number with less interference of the adjacent cell is reduced; therefore, the problem that the order of the subframe MCS corresponding to the subframe number with less interference from the adjacent cell in the serving cell is low exists.
It should be noted that fig. 1 illustrates that the serving cell has 6 neighboring cells, and the serving cell may have one or more neighboring cells.
It should be noted that, when the serving cell is a cell (i.e., a hotspot cell) with a large number of users and a large traffic volume, the problem of a lower MCS order of a subframe corresponding to a subframe number with less interference from an adjacent cell needs to be solved more urgently.
Fig. 2 is a flowchart of a first embodiment of a CQI adjustment method according to the present invention, and as shown in fig. 2, an execution subject of the method of this embodiment may be a base station to which a serving cell belongs, and the method of this embodiment may include:
step 201, obtaining subframe number classification information; the subframe number classification information is used for indicating that the interference levels of subframes corresponding to subframe numbers belonging to different classes in the adjacent cell to the serving cell are different;
wherein the interference level may include high interference, low interference; alternatively, the interference levels may include high interference, medium interference, and low interference.
It should be noted that the interference level may be divided into other numbers of levels.
Optionally, step 201 may include:
acquiring the data bearing state of each subframe number of the adjacent cell, and determining the subframe number classification information according to the data bearing state of each subframe number;
or,
and acquiring the interference level of the sub-frame corresponding to each sub-frame number of the adjacent cell to the service cell, and determining the sub-frame number classification information according to the interference level of the sub-frame corresponding to each sub-frame number to the service cell.
The data carrying state may include that data is not carried, a small amount of data is carried, more data is carried, and the like. The data bearer state, e.g., the subframe number turned off (e.g., subframe number 2, 3), may be an unloaded state; the data bearing state of the subframe number 0 bearing the broadcast message can be more data; the data carrying state of the subframe numbers (e.g., subframe numbers 1, 4) that are not turned off may be to carry a small amount of data.
It should be noted that, when the data carrying state of the subframe number of the neighboring cell indicates that the more data is carried by the subframe number, the higher the interference level of the subframe number to the serving cell is. That is to say, the data carrying state of the subframe number of the neighboring cell can indirectly reflect the interference level of the subframe number of the neighboring cell to the serving cell.
For example, for subframe numbers 0-910, the subframe number classification information may be: subframe number 0 and subframe number 5 are of a first type; subframe number 1, subframe number 4, subframe number 9 are of the second class; subframe number 2, subframe number 3, subframe number 6, subframe number 7, subframe number 8 are of the third class. The interference level of each subframe number in the first class to the serving cell is high interference, the interference level of each subframe number in the second class to the serving cell is medium interference, and the interference level of each subframe number in the third class to the serving cell is low interference.
It should be noted that, when there are multiple neighboring cells of the serving cell, the data carrying states (or interference levels to the serving cell) of the same subframe number of different neighboring cells may be the same or different. When different, the data carrying status (or the interference level to the serving cell) of the same subframe number of each neighboring cell needs to be comprehensively considered to determine the subframe number classification information.
Step 202, dividing at least two subframe numbers into at least two groups according to the subframe number classification information; wherein the at least two subframe numbers are subframe numbers of subframes in which the UE reports ACK/NCK feedback; of the at least two subframe numbers, subframe numbers in the same group belong to the same category in the subframe number classification information, and subframe numbers in different groups belong to different categories in the subframe number classification information;
for example, on the basis of the example in step 201, if the at least two subframe numbers are subframe number 1, subframe number 4 and subframe number 5, it is determined that the at least two subframe numbers are divided into two groups; one group includes subframe number 1, subframe number 4, and the other group includes subframe number 5.
Step 203, determining the at least two groups of CQI adjustment values respectively corresponding to the at least two subframe numbers according to the ACK/NCK feedback of the UE on the subframes respectively corresponding to the at least two subframe numbers; determining at least two groups of corrected CQI corresponding to the at least two groups of CQI according to the at least two groups of CQI adjustment amounts corresponding to the at least two groups of CQI respectively and the CQI reported by the UE;
optionally, the determining, according to the ACK/NCK feedback of the UE on the subframes corresponding to the at least two subframe numbers respectively, the at least two groups of CQI adjustment amounts corresponding respectively includes:
and for each group in the at least two groups, determining the CQI adjustment amount of each group according to the ACK/NCK feedback of the UE on the subframe corresponding to the subframe number belonging to each group in the at least two subframe numbers.
Optionally, the principle of determining the CQI adjustment amount according to the ACK/NCK feedback may be:
the amount of CQI adjustment is decreased when NCK is received and increased when ACK is received.
Optionally, the determining, according to the at least two sets of CQI adjustment amounts respectively corresponding to the at least two sets of CQIs reported by the UE, the modified CQIs respectively corresponding to the at least two sets of CQIs includes:
and for each group in the at least two groups, determining the corrected CQI of each group according to the CQI adjustment quantity of each group and the CQI.
Step 204, determining the at least two groups of TB indexes respectively corresponding to the at least two groups of CQI after correction respectively corresponding to the at least two groups; and scheduling transmission resources according to the at least two groups of transmission block TB indexes respectively corresponding to the at least two groups.
Optionally, the determining the TB indexes respectively corresponding to the at least two groups according to the at least two groups of respectively corresponding modified CQIs includes:
for each of the at least two groups, a TB index for each group is determined from the modified CQI for each group.
Determining the TB index according to the modified CQI may include:
when the corrected CQI is an integer, taking the corrected CQI as a TB index; when the corrected CQI is a decimal number, the integer part of the corrected CQI is used as the TB index.
Optionally, the scheduling transmission resources according to the at least two groups of transport block TB indexes respectively corresponding to each group includes:
and in the resource block RB allocated to the UE, scheduling transmission resources of the subframes of which subframe numbers belong to any one of the at least two groups according to the TB indexes of the any one group.
It should be noted that, in the present invention, the serving cell and the neighboring cell should be time synchronized.
In the prior art, a base station to which a serving cell belongs uniformly performs CQI adjustment based on ACK/NCK feedback on subframes corresponding to all subframe numbers reported by a UE; when the interference of the adjacent cell on the subframe corresponding to a part of subframe numbers in the service cell is smaller, and the interference of the adjacent cell on the subframe corresponding to the other part of subframe numbers is larger, the number of NCKs fed back on the subframe corresponding to the part of subframe numbers which are interfered by the adjacent cell and are larger in the service cell is larger than the number of NCKs fed back on the subframe corresponding to the part of subframe numbers which are interfered by the adjacent cell and are smaller; and because the more the NCK number, the smaller the CQI adjustment amount, the smaller the corresponding MCS order; therefore, in the prior art, the CQI adjustment is performed uniformly based on ACK/NCK feedback on subframes corresponding to all subframe numbers reported by the UE (that is, a uniform CQI adjustment amount is calculated for all subframes where the UE reports ACK/NCK feedback), which may lower the MCS order of a subframe corresponding to a subframe number with less interference from the neighboring cell; therefore, the problem that the order of the sub-frame MCS corresponding to the sub-frame number with less interference from the adjacent cell is lower exists in the prior art; and the smaller the MCS order, the less the data volume can be transmitted; therefore, the problem that the downlink throughput rate of the subframe corresponding to the subframe number with less interference from the adjacent cell is insufficient exists in the prior art.
In the invention, at least two subframe numbers reported by the UE and fed back by the ACK/NCK are divided into at least two groups according to subframe number classification information (the subframe number classification information is used for indicating that the interference levels of subframes corresponding to the subframe numbers belonging to different classes in the adjacent cell to the service cell are different); wherein, the sub-frame numbers in the same group belong to the same category in the sub-frame number classification information, and the sub-frame numbers in different groups belong to different categories in the sub-frame number classification information; determining the at least two groups of CQI adjustment quantities corresponding to the at least two sub-frame numbers respectively according to ACK/NCK feedback of the UE on the sub-frames corresponding to the at least two sub-frame numbers respectively; determining at least two groups of corrected CQI corresponding to the at least two groups of CQI according to the at least two groups of CQI adjustment amounts corresponding to the at least two groups of CQI respectively and the CQI reported by the UE; determining the TB indexes respectively corresponding to the at least two groups according to the corrected CQI respectively corresponding to the at least two groups; scheduling transmission resources according to the at least two groups of transmission block TB indexes respectively corresponding to the at least two groups of transmission blocks; the subframe numbers of the subframes of the ACK/NCK reported by the UE can be grouped according to the subframe number classification information, the interference levels of the subframe numbers in the same group to the service cell are the same, and the interference levels of the subframe numbers in different groups to the service cell are different; respectively determining corresponding CQI adjustment quantities for different groups; the MCS order of the subframe corresponding to the subframe number with less interference of the adjacent cell is prevented from being lowered by the subframe corresponding to the subframe number with greater interference of the adjacent cell in different groups; and the MCS order of the subframe corresponding to the subframe number with less interference of the adjacent region is improved. Therefore, the problem that the order of the MCS of the subframe corresponding to the subframe number with less interference of the adjacent cell is lower in the prior art is solved; meanwhile, the problem that the downlink throughput rate of the subframe corresponding to the subframe number with small interference of the adjacent cell in the prior art is insufficient is solved.
Fig. 3 is a flowchart of a second embodiment of a CQI adjustment method according to the present invention, and as shown in fig. 3, the method of this embodiment may include:
step 301, the first base station turns off subframe numbers 2, 3, 6, 7 and 8 which do not need to send user data in the adjacent region; the first base station is a base station to which the adjacent cell belongs;
step 302, the second base station obtains the subframe number classification information; the sub-frame number classification information includes sub-frame numbers 0 and 5, sub-frame numbers 1, 4 and 9 and sub-frame numbers 2, 3, 6, 7 and 8; the second base station is a base station to which a serving cell belongs;
optionally, the obtaining, by the second base station, the subframe number classification information may include:
the first base station sends subframe number classification information to the second base station; or, the second base station determines the subframe number classification information according to configuration information input by a user.
It should be noted that, since the subframe numbers 0 and 5 in the neighboring cell are used for sending the broadcast message, the interference to the serving cell is high; subframe numbers 2, 3, 6, 7, 8 are turned off (i.e., the power amplifier is turned off during these subframe number periods), thus causing low interference to the serving cell; the remaining subframe numbers 1, 4, 9 interfere in the serving cell.
The first base station and the second base station may be different base stations or the same base station.
Step 303, the second base station divides subframe numbers 1, 2, 3, 4, 6, 7, 8, and 9 of subframes fed back by the ACK/NCK reported by the UE into a first group and a second group according to the subframe number classification information; wherein the first group comprises subframe numbers 1, 4, 9, and the second group comprises subframe numbers 2, 3, 6, 7, 8;
step 304, the second base station determines the CQI adjustment amount of the first group according to the ACK/NCK feedback of the UE on the subframes with the subframe numbers of 1, 4 and 9, and determines the CQI adjustment amount of the second group according to the ACK/NCK feedback of the UE on the subframes with the subframe numbers of 2, 3, 6, 7 and 8;
it should be noted that the ACK/NCK feedback when determining the CQI adjustment amount of the first group or the CQI adjustment amount of the second group may be a statistical value of ACK/NCK feedback in a period of time.
Step 305, the second base station determines the modified CQI of the first group according to the CQI adjustment amount of the first group and the CQI reported by the UE; determining the corrected CQI of the second group according to the CQI adjustment quantity of the second group and the CQI reported by the UE;
optionally, the determining, by the first base station, the modified CQI of the first group according to the CQI adjustment amount of the first group and the CQI reported by the UE includes:
and the first base station determines the sum of the CQI adjustment quantity of the first group and the CQI reported by the UE as the corrected CQI of the first group.
It should be noted that, when the UE reports multiple CQIs, the modified CQI may be determined only by using the CQI last reported by the UE, or the modified CQI may also be determined by using the filtered values of the CQI last reported by the UE and the CQI last reported.
Step 306, the second base station determines the TB index of the first group according to the modified CQI of the first group, and determines the TB index of the second group according to the modified CQI of the second group;
step 307, the second base station performs scheduling of transmission resources according to the TB index of the first group on the subframe whose subframe number belongs to the first group, and performs scheduling of transmission resources according to the TB index of the second group on the subframe whose subframe number belongs to the second group, in the RB allocated to the UE.
In the embodiment, the subframe numbers of the subframes reported by the UE and fed back by the ACK/NCK are divided into a first group and a second group according to the subframe number classification information; determining the corrected CQI of the first group and the second group respectively on the basis of determining the CQI adjustment amount of the first group and the second group respectively; further determining TB indices of the first group and the second group, respectively; further scheduling transmission resources according to the TB indexes respectively corresponding to the first group and the second group; the MCS order of the subframe corresponding to the subframe number with less interference of the adjacent cell is prevented from being lowered by the subframe corresponding to the subframe number with greater interference of the adjacent cell in different groups; the MCS order of the subframe corresponding to the subframe number with less interference of the adjacent region is improved; the problem that the order of the MCS of the subframe corresponding to the subframe number with small interference of the adjacent cell is low in the prior art is solved.
A laboratory scenario: one UE in a service Cell and the service Cell are provided with two adjacent cells, three cells belong to the same base station, and Physical Cell Identities (PCI) among the cells do not conflict with one another in a modulo three mode; the serving cell is full, the neighbor cell is empty, and the subframe number classification information is as described in step 302.
When the method of the present invention is turned on or off, the MCS orders and downlink throughput results corresponding to different Signal to interference plus Noise ratios (SINRs) (i.e., positions) are shown in table 1.
TABLE 1
As can be seen from table 1, in a laboratory scenario, the present invention improves downlink throughput compared to the prior art.
In table 1, the SINR is greater than 20db and is considered as the near point, the SINR is between 10db and 20db and is considered as the middle point, and the SINR is less than 10db and is considered as the far point.
An external field scene: time synchronization between two stations; a UE is arranged in a serving cell, the serving cell is provided with two adjacent cells, and PCI model three among the cells does not conflict; the service cell and one of the adjacent cells belong to one site, and the other adjacent cell belongs to the other site; the serving cell is full, the neighbor cell is empty, and the subframe number classification information is as described in step 302.
When the method of the present invention is opened or closed, the corresponding MCS order and downlink throughput rate results are shown in Table 2 under different SINR.
TABLE 2
Method state of the invention Average SINR Average MCS order Average downlink throughput rate
Close off 13.84 21.28 28001.12
Open 14.03 23.11 33090.47
As can be seen from table 2, in the external field scenario, the present invention improves the downlink throughput compared to the prior art.
In tables 1 and 2, the unit of SINR is db, and the unit of downlink throughput is kpbs.
Fig. 4 is a graph showing a relationship between SINR and downlink throughput in an external field scenario according to the present invention, where the horizontal axis in fig. 4 represents SINR and the vertical axis represents downlink throughput. As can be seen from fig. 4, compared with the prior art, the present invention improves the downlink throughput under the same SINR.
FIG. 5 is a relationship curve between SINR and MCS orders in the external field scenario of the present invention; in fig. 5, the horizontal axis represents SINR and the vertical axis represents MCS order. As can be seen from fig. 5, compared with the prior art, the MCS level of the present invention is increased under the same SINR.
In fig. 4 and 5, the unit of SINR is db, and the unit of downlink throughput is kpbs.
FIG. 6 is a schematic structural diagram of a first embodiment of an apparatus for adjusting CQI according to the present invention; the device is applied to a Long Term Evolution (LTE) system, the LTE system comprises a service cell where User Equipment (UE) is located and a neighboring cell of the service cell, and the service cell and the neighboring cell are time-synchronized; the apparatus is a base station to which the serving cell belongs, and as shown in fig. 6, the apparatus of this embodiment may include: an obtaining module 601, a grouping module 602, a CQI adjustment amount determining module 603, and a scheduling module 604. The obtaining module 601 is configured to obtain subframe number classification information, where the subframe number classification information is used to indicate that subframes corresponding to subframe numbers belonging to different categories in the neighboring cell have different interference levels to the serving cell; a grouping module 602, configured to divide at least two subframe numbers into at least two groups according to the subframe number classification information; wherein the at least two subframe numbers are subframe numbers of subframes for reporting ACK/negative acknowledgement (NCK) feedback by the UE; of the at least two subframe numbers, subframe numbers in the same group belong to the same category in the subframe number classification information, and subframe numbers in different groups belong to different categories in the subframe number classification information; a CQI adjustment determining module 603, configured to determine, according to ACK/NCK feedback of the UE on subframes corresponding to the at least two subframe numbers, the at least two groups of CQI adjustment amounts corresponding to each other; determining at least two groups of corrected CQI corresponding to the at least two groups of CQI according to the at least two groups of CQI adjustment amounts corresponding to the at least two groups of CQI respectively and the CQI reported by the UE; a scheduling module 604, configured to determine, according to the at least two groups of modified CQIs corresponding to the at least two groups, corresponding transport block TB indexes of the at least two groups; and scheduling transmission resources according to the at least two groups of transmission block TB indexes respectively corresponding to the at least two groups.
Optionally, the obtaining module 601 is specifically configured to obtain a data carrying state of each subframe number of the neighboring cell, and determine the subframe number classification information according to the data carrying state of each subframe number; or acquiring the interference level of the sub-frame corresponding to each sub-frame number of the adjacent cell to the serving cell, and determining the sub-frame number classification information according to the interference level of the sub-frame corresponding to each sub-frame number to the serving cell.
Optionally, the CQI adjustment amount determining module 603 determines, according to the ACK/NCK feedback of the UE on the subframes corresponding to the at least two subframe numbers, the at least two groups of CQI adjustment amounts corresponding to each other, specifically including:
and for each group in the at least two groups, determining the CQI adjustment amount of each group according to the ACK/NCK feedback of the UE on the subframe corresponding to the subframe number belonging to each group in the at least two subframe numbers.
Optionally, the CQI adjustment amount determining module 603 determines, according to the at least two sets of CQI adjustment amounts corresponding respectively and the CQI reported by the UE, the at least two sets of modified CQIs corresponding respectively, and specifically includes:
and for each group in the at least two groups, determining the corrected CQI of each group according to the CQI adjustment quantity of each group and the CQI.
Optionally, the scheduling module 604 schedules the transmission resources according to the at least two groups of transport block TB indexes respectively corresponding to each other, and specifically includes:
and in the resource block RB allocated to the UE, scheduling transmission resources of the subframes of which subframe numbers belong to any one of the at least two groups according to the TB indexes of the any one group.
The apparatus of this embodiment may be used to implement the technical solutions of fig. 2 and fig. 3, and the implementation principle and the technical effect are similar, which are not described herein again.
FIG. 7 is a schematic structural diagram of a second embodiment of a CQI adjustment apparatus according to the present invention; the device is applied to a Long Term Evolution (LTE) system, the LTE system comprises a service cell where User Equipment (UE) is located and a neighboring cell of the service cell, and the service cell and the neighboring cell are time-synchronized; the apparatus is a base station to which the serving cell belongs, and as shown in fig. 7, the apparatus of this embodiment may include: a processor 701 and a memory 702. The apparatus may further comprise a transmitter 703, a receiver 704. The transmitter 703 and the receiver 704 may be connected to the processor 701. Wherein the transmitter 703 is configured to transmit data or information, the receiver 704 is configured to receive data or information, the memory 702 stores execution instructions, and when the apparatus is operated, the processor 701 communicates with the memory 702, and the processor 701 invokes the execution instructions in the memory 702 to perform the following operations:
acquiring subframe number classification information, wherein the subframe number classification information is used for indicating that interference levels of subframes corresponding to subframe numbers belonging to different classes in the adjacent cell to the serving cell are different;
dividing at least two subframe numbers into at least two groups according to the subframe number classification information; wherein the at least two subframe numbers are subframe numbers of subframes for reporting ACK/negative acknowledgement (NCK) feedback by the UE; of the at least two subframe numbers, subframe numbers in the same group belong to the same category in the subframe number classification information, and subframe numbers in different groups belong to different categories in the subframe number classification information;
determining the at least two groups of CQI adjustment quantities corresponding to the at least two sub-frame numbers respectively according to ACK/NCK feedback of the UE on the sub-frames corresponding to the at least two sub-frame numbers respectively; determining at least two groups of corrected CQI corresponding to the at least two groups of CQI according to the at least two groups of CQI adjustment amounts corresponding to the at least two groups of CQI respectively and the CQI reported by the UE;
determining the TB indexes of the at least two groups of transmission blocks corresponding to each other according to the at least two groups of modified CQI corresponding to each other; and scheduling transmission resources according to the at least two groups of transmission block TB indexes respectively corresponding to the at least two groups.
Optionally, the obtaining subframe number classification information includes:
acquiring the data bearing state of each subframe number of the adjacent cell, and determining the subframe number classification information according to the data bearing state of each subframe number;
or,
and acquiring the interference level of the sub-frame corresponding to each sub-frame number of the adjacent cell to the service cell, and determining the sub-frame number classification information according to the interference level of the sub-frame corresponding to each sub-frame number to the service cell.
Optionally, the determining, according to the ACK/NCK feedback of the UE on the subframes corresponding to the at least two subframe numbers respectively, the at least two groups of CQI adjustment amounts corresponding respectively includes:
and for each group in the at least two groups, determining the CQI adjustment amount of each group according to the ACK/NCK feedback of the UE on the subframe corresponding to the subframe number belonging to each group in the at least two subframe numbers.
Optionally, the determining, according to the at least two sets of CQI adjustment amounts respectively corresponding to the at least two sets of CQIs reported by the UE, the modified CQIs respectively corresponding to the at least two sets of CQIs includes:
and for each group in the at least two groups, determining the corrected CQI of each group according to the CQI adjustment quantity of each group and the CQI.
Optionally, the scheduling transmission resources according to the at least two groups of transport block TB indexes respectively corresponding to each group includes:
and in the resource block RB allocated to the UE, scheduling transmission resources of the subframes of which subframe numbers belong to any one of the at least two groups according to the TB indexes of the any one group.
The apparatus of this embodiment may be used to implement the technical solutions of fig. 2 and fig. 3, and the implementation principle and the technical effect are similar, which are not described herein again.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (8)

1. A method for adjusting a Channel Quality Indicator (CQI) is applied to a Long Term Evolution (LTE) system, wherein the LTE system comprises a serving cell where User Equipment (UE) is located and a neighboring cell of the serving cell, and the serving cell and the neighboring cell are time-synchronized; the method is performed by a base station to which the serving cell belongs, and comprises:
acquiring subframe number classification information, wherein the subframe number classification information is used for indicating that interference levels of subframes corresponding to subframe numbers belonging to different classes in the adjacent cell to the serving cell are different;
dividing at least two subframe numbers into at least two groups according to the subframe number classification information; wherein the at least two subframe numbers are subframe numbers of subframes for reporting ACK/negative acknowledgement (NCK) feedback by the UE; of the at least two subframe numbers, subframe numbers in the same group belong to the same category in the subframe number classification information, and subframe numbers in different groups belong to different categories in the subframe number classification information;
determining the at least two groups of CQI adjustment quantities corresponding to the at least two sub-frame numbers respectively according to ACK/NCK feedback of the UE on the sub-frames corresponding to the at least two sub-frame numbers respectively; determining at least two groups of corrected CQI corresponding to the at least two groups of CQI according to the at least two groups of CQI adjustment amounts corresponding to the at least two groups of CQI respectively and the CQI reported by the UE;
determining the TB indexes of the at least two groups of transmission blocks corresponding to each other according to the at least two groups of modified CQI corresponding to each other; scheduling transmission resources according to the at least two groups of transmission block TB indexes respectively corresponding to the at least two groups of transmission blocks;
the obtaining of the subframe number classification information includes:
acquiring the data bearing state of each subframe number of the adjacent cell, and determining the subframe number classification information according to the data bearing state of each subframe number;
or,
and acquiring the interference level of the sub-frame corresponding to each sub-frame number of the adjacent cell to the service cell, and determining the sub-frame number classification information according to the interference level of the sub-frame corresponding to each sub-frame number to the service cell.
2. The method of claim 1, wherein the determining the at least two sets of CQI adjustments corresponding to each other according to ACK/NCK feedback of the UE on subframes corresponding to the at least two subframe numbers comprises:
and for each group in the at least two groups, determining the CQI adjustment amount of each group according to the ACK/NCK feedback of the UE on the subframe corresponding to the subframe number belonging to each group in the at least two subframe numbers.
3. The method according to claim 1 or 2, wherein the determining the at least two groups of modified CQIs corresponding to the at least two groups of CQI adjustments and the CQIs reported by the UE comprises:
and for each group in the at least two groups, determining the corrected CQI of each group according to the CQI adjustment quantity of each group and the CQI.
4. The method according to claim 1 or 2, wherein the scheduling of transmission resources according to the at least two groups of corresponding Transport Block (TB) indexes comprises:
and in the resource block RB allocated to the UE, scheduling transmission resources of the subframes of which subframe numbers belong to any one of the at least two groups according to the TB indexes of the any one group.
5. The device for adjusting the Channel Quality Indicator (CQI) is applied to a Long Term Evolution (LTE) system, the LTE system comprises a serving cell where User Equipment (UE) is located and a neighboring cell of the serving cell, and the serving cell and the neighboring cell are time-synchronized; the apparatus is a base station to which the serving cell belongs, and the apparatus includes:
an obtaining module, configured to obtain subframe number classification information, where the subframe number classification information is used to indicate that subframes corresponding to subframe numbers belonging to different classes in the neighboring cell have different interference levels to the serving cell;
the grouping module is used for dividing at least two subframe numbers into at least two groups according to the subframe number classification information; wherein the at least two subframe numbers are subframe numbers of subframes for reporting ACK/negative acknowledgement (NCK) feedback by the UE; of the at least two subframe numbers, subframe numbers in the same group belong to the same category in the subframe number classification information, and subframe numbers in different groups belong to different categories in the subframe number classification information;
a CQI adjustment amount determining module, configured to determine the at least two groups of CQI adjustment amounts corresponding to each other according to ACK/NCK feedback of the UE on subframes corresponding to the at least two subframe numbers respectively; determining at least two groups of corrected CQI corresponding to the at least two groups of CQI according to the at least two groups of CQI adjustment amounts corresponding to the at least two groups of CQI respectively and the CQI reported by the UE;
a scheduling module, configured to determine, according to the at least two groups of modified CQIs corresponding to the at least two groups, corresponding transport block TB indexes of the at least two groups; scheduling transmission resources according to the at least two groups of transmission block TB indexes respectively corresponding to the at least two groups of transmission blocks;
the acquisition module is specifically configured to:
acquiring the data bearing state of each subframe number of the adjacent cell, and determining the subframe number classification information according to the data bearing state of each subframe number;
or,
and acquiring the interference level of the sub-frame corresponding to each sub-frame number of the adjacent cell to the service cell, and determining the sub-frame number classification information according to the interference level of the sub-frame corresponding to each sub-frame number to the service cell.
6. The apparatus according to claim 5, wherein the module for determining CQI adjustment amounts determines the at least two sets of CQI adjustment amounts corresponding to each other according to ACK/NCK feedback of the UE on subframes corresponding to the at least two subframe numbers respectively, and specifically includes:
and for each group in the at least two groups, determining the CQI adjustment amount of each group according to the ACK/NCK feedback of the UE on the subframe corresponding to the subframe number belonging to each group in the at least two subframe numbers.
7. The apparatus according to claim 5 or 6, wherein the determining module for determining the at least two groups of modified CQIs according to the at least two groups of CQI adjustment amounts corresponding to each other and the CQI reported by the UE specifically includes:
and for each group in the at least two groups, determining the corrected CQI of each group according to the CQI adjustment quantity of each group and the CQI.
8. The apparatus according to claim 5 or 6, wherein the scheduling module performs scheduling of transmission resources according to the at least two groups of transport block TB indexes respectively corresponding to the at least two groups of transport block TBs, specifically comprising:
and in the resource block RB allocated to the UE, scheduling transmission resources of the subframes of which subframe numbers belong to any one of the at least two groups according to the TB indexes of the any one group.
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