CN104052572B - A kind of downlink transmission method and subscriber terminal equipment - Google Patents

A kind of downlink transmission method and subscriber terminal equipment Download PDF

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Publication number
CN104052572B
CN104052572B CN201310515958.XA CN201310515958A CN104052572B CN 104052572 B CN104052572 B CN 104052572B CN 201310515958 A CN201310515958 A CN 201310515958A CN 104052572 B CN104052572 B CN 104052572B
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mcs
cqi
information
256qam
item
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CN104052572A (en
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李迎阳
孙程君
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Beijing Samsung Telecommunications Technology Research Co Ltd
Samsung Electronics Co Ltd
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Beijing Samsung Telecommunications Technology Research Co Ltd
Samsung Electronics Co Ltd
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Priority to CN201910492392.0A priority Critical patent/CN111224763B/en
Application filed by Beijing Samsung Telecommunications Technology Research Co Ltd, Samsung Electronics Co Ltd filed Critical Beijing Samsung Telecommunications Technology Research Co Ltd
Priority to CN201310515958.XA priority patent/CN104052572B/en
Priority to JP2016540784A priority patent/JP6531102B2/en
Priority to KR1020217008122A priority patent/KR102347644B1/en
Priority to US14/916,399 priority patent/US10257841B2/en
Priority to PCT/KR2014/002289 priority patent/WO2015034151A1/en
Priority to EP14841653.0A priority patent/EP3042520B1/en
Priority to KR1020167005022A priority patent/KR20160051758A/en
Publication of CN104052572A publication Critical patent/CN104052572A/en
Priority to US16/031,317 priority patent/US10455594B2/en
Priority to US16/263,793 priority patent/US10448413B2/en
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Publication of CN104052572B publication Critical patent/CN104052572B/en
Priority to US16/561,498 priority patent/US10609717B2/en
Priority to US16/659,085 priority patent/US10779293B2/en
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Abstract

This application discloses a kind of downlink transmission method and subscriber terminal equipments, comprising: UE receives the configuration information of the transmission of base station, and correspondingly adjusts CQI table and MCS table；UE measurement and to base station report downlink channel quality information, here UE can according to backward compatibility CQI table or support the CQI table of 256QAM modulation and carry out report CQI information；UE receives the down dispatch information that base station is sent and correspondingly receives the downlink data that base station is sent, and here, UE can handle the MCS information in DCI information according to the MCS table of backward compatibility or the MCS table of support 256QAM modulation.Using the process and apparatus of the present invention, the CQI table and MCS table for supporting 256QAM transmission can be generated, and it supports to be selected according to the link state of UE using the CQI/MCS table or selection of existing LTE standard using the CQI/MCS table for supporting 256QAM, to optimize the performance of downlink transfer.

Description

A kind of downlink transmission method and subscriber terminal equipment
Technical field
The present invention relates to wireless communication system, more specifically to a kind of downlink transmission method and subscriber terminal equipment. Background technique
In 3GPP LTE system, the length of each radio frames is 10ms, is divided into 10 subframes.When one downlink transfer Between interval (TTI) be just defined in a subframe.As shown in Figure 1, each downlink subframe includes two time slots, to general circulation Prefix (CP) length, each time slot include 7 OFDM symbols；To extension CP length, each time slot includes 6 OFDM symbols.Often In a subframe, preceding n OFDM symbol, n is equal to 1,2 or 3, is used for transmission Downlink Control Information, including physical down control letter Road (PDCCH) and other control information；Remaining OFDM symbol is used to transmit PDSCH or enhancing PDCCH(EPDCCH).Resource The granularity of distribution is Physical Resource Block PRB, and a PRB includes 12 continuous subcarriers in frequency, corresponds to one in time A time slot.Two PRB in two time slots in one subframe in same sub-carrier are known as a PRB pair.In each PRB pair Interior, each resource unit (RE) is the minimum unit of running time-frequency resource, i.e., is a subcarrier in frequency, is an OFDM on the time Symbol.RE may be respectively used for different functions, for example, a part of RE may be respectively used for transmission cell specific reference signal (CRS), the specific demodulated reference signal of user (DMRS), channel quality instruction reference signal (CSI-RS) etc..
In LTE system, the transmission mode of a variety of transmission data is defined, for example, to down direction, including closed loop enters more Have more (MIMO) transmission mode, open-loop MIMO mode, transmitting diversity transmission mode etc..To a transmission mode, system configuration one Normal Downlink Control Information (DCI) format of kind, for completing the normal data transfer of this transmission mode；Meanwhile base station is also Configuration UE detects a kind of recurrence DCI format, and it is less to return the general bit number of DCI format, using than dispatching number by the way of more conservative According to, such as transmitting diversity or single antenna transmission data, so that reliability is higher.
In LTE system, the DCI or the different DCI of function for being sent to different UE are absolute codings and send.Right It is with control channel unit (CCE) for unit when PDCCH carries out physical resource mapping；It is reflected carrying out physical resource to EPDCCH It is to enhance CCE(ECCE when penetrating) it is unit.In the following description, when not needing to distinguish especially PDCCH and EPDCCH, They are referred to as (E) PDCCH；Correspondingly, (E) CCE is referred to as when CCE and ECCE.Specifically, i.e., the tune of one (E) PDCCH Symbol processed can be mapped on L (E) CCE, and L can be equal to 1,2,4,16 or 32, the L also referred to as polymer grade of (E) PDCCH Not.(E) the fixed modulator approach for using QPSK of PDCCH, the link condition of bit number and UE according to the control information, base station can To select (E) CCE aggregation level for sending (E) PDCCH.
In existing LTE version, support to carry out downlink data transmission based on QPSK, 16QAM and 64QAM.As shown in table 1 It is the index of the code modulation mode (MCS) for downlink transfer and transport block size (TBS).Specifically, in existing LTE In version, in DCI information, MCS and TBS information is indicated with 5 bits, wherein 29 code words be and meanwhile indicating modulation mode and TBS, last 3 code words only indicate modulation system, and TBS information is obtained according to pervious DCI information, can be used for pair The re-transmission of PDSCH.
The MCS and TBS of table 1:PDSCH transmission
Correspondingly, in order to support base station dispatching downlink PRB resource, UE needs to report link state instruction information (CSI), packet Include channel quality indication (CQI) information (CQI).It is the information such as the corresponding modulation system of each CQI index and code rate as shown in table 2. It specifically, is with 4 bits come report CQI information in existing LTE version.It is configured with the MCS in existing LTE version Unanimously, in the measurement of CQI, the case where downlink data transmission is carried out based on QPSK, 16QAM and 64QAM is only supported at present.
CQI information
In LTE version 12, in order to increase the peak value downlink transmission rate of cell, a kind of possible candidate technologies are branch Hold the PDSCH transmission based on 256QAM modulation.It is realized in typical network configuration, such as using the macro base station on lower frequency The range covered greatly；And some small base stations are configured on upper frequency to realize that hot spot covers.Because small base station uses high frequency points, Its propagation characteristic determines that inter-cell interference is smaller, and not from the interference of macro base station, the noise of UE in this way in cell Can be very big than (SINR), it can support to carry out downlink transfer based on 256QAM completely.In order to introduce the support to 256QAM, The processing method of MCS and CQI is required to modify accordingly in the existing specification of LTE, and it is a series of to solve thus bring Problem.
Summary of the invention
This application discloses a kind of downlink transmission method and subscriber terminal equipments, 256QAM can be supported to modulate, under optimization The performance of row transmission.
To achieve the above object, the application adopts the following technical scheme that:
A kind of downlink transmission method, comprising:
UE measurement simultaneously indicates CQI information to base station report down channel quality；Wherein, the UE is according to backward compatibility CQI table supports the CQI table of 256QAM modulation to report the CQI information；
The UE receives the down dispatch information that base station is sent, and according to the modulation in Downlink Control Information DCI therein Coding mode MCS information correspondingly receives and handles the downlink data that base station is sent；Wherein, the UE is according to backward compatibility MCS table supports MCS information described in the MCS Form Handle of 256QAM modulation.
Preferably, the CQI table for supporting 256QAM modulation are as follows:
In the CQI table of the backward compatibility, minimum several CQI of removal spectrum efficiency, and corresponding increase The CQI item of 256QAM modulation；
Alternatively, in the CQI table of the backward compatibility, retain code rate minimum several CQI it is constant, if removing The CQI item of dry QPSK modulation or 16QAM modulation, and the corresponding CQI item for increasing 256QAM modulation；
Alternatively, in the CQI table of the backward compatibility, to the CQI item increase feedback of spectrum efficiency within the set range Granularity, and the corresponding CQI item for increasing 256QAM modulation；
And/or in the CQI table of the backward compatibility, the CQI of the highest several 64QAM modulation of removal code rate , and the corresponding CQI item for increasing 256QAM modulation.
Preferably, the CQI table for supporting 256QAM modulation are as follows:
In the CQI table of the backward compatibility, minimum several CQI of removal spectrum efficiency are substituted for 256QAM tune The CQI item of system；
Alternatively, in the CQI table of the backward compatibility, retain code rate minimum several CQI it is constant, several Modulation system is that the CQI item of QPSK or 16QAM is substituted for the CQI item of 256QAM modulation；
Alternatively, in the CQI table of the backward compatibility, by the part CQI replacement of spectrum efficiency within the set range The CQI item modulated at 256QAM；
And/or in the CQI table of the backward compatibility, by the highest one or several 64QAM modulation of code rate CQI, the corresponding CQI item for being substituted for 256QAM modulation.
Preferably, the CQI table for supporting 256QAM modulation are as follows: increase in the CQI table of the backward compatibility The CQI item of 256QAM modulation.
Preferably, when the UE is according to the CQI table of 256QAM modulation is supported to report the CQI information, this method Further comprise:
Increase the bit number that the CQI information occupies, is used to indicate the CQI information reported in the support CQI index in the CQI table of 256QAM modulation；Alternatively,
The UE reports a deviant to the base station when reporting the CQI information, is used to indicate CQI described in base station Practical index of the information in the CQI table of the support 256QAM modulation；Alternatively,
The UE receives the deviant that base station is sent, and the CQI modulated according to the deviant in the support 256QAM Part CQI is extracted in table constitutes the CQI table actually used when reporting the CQI information.
Preferably, this method further comprises: the CQI table that each sub-frame set of the UE uses is respectively configured in base station Lattice；
The CQI table that the UE is used according to sub-frame set belonging to the CQI information reports the CQI information.
Preferably, this method further comprises: the CQI table that each CSI process of the UE uses is respectively configured in base station；
The UE reports the CQI information according to the CQI table that CSI process belonging to the CQI information uses.
Preferably, this method further comprises: each CSI process of the UE is respectively configured in base station and sub-frame set uses CQI table；
The UE reports the CQI according to the CQI table that CSI process and sub-frame set belonging to the CQI information use Information.
Preferably, this method further comprises: UE receives the configuration information that base station is sent, for configuring the UE using branch Hold CQI information described in the CQI table of 256QAM modulation or the CQI tabular report of backward compatibility.
Preferably, the MCS table for supporting 256QAM modulation are as follows:
In the MCS table of the backward compatibility, the MCS item of the minimum several QPSK modulation of removal code rate, and increase The MCS item for adding 256QAM to modulate；
Alternatively, retaining the MCS item of the minimum several QPSK modulation of code rate in the MCS table of the backward compatibility It is constant, the MCS item of several QPSK modulation or 16QAM modulation is removed, and increase the MCS item of 256QAM modulation；
Alternatively, in the MCS table of the backward compatibility, the spectrum efficiency that removal is obtained by interpolation is within the set range MCS item, and increase 256QAM modulation MCS item；
Alternatively, when the CQI table for supporting 256QAM is CQI several in the CQI table for remove the backward compatibility And when increasing the CQI item of 256QAM modulation, in the MCS table of the backward compatibility, by MCS corresponding with the CQI of removal item Item removal, and increase the MCS item of 256QAM modulation；
And/or in the MCS table of the backward compatibility, the highest one or several 64QAM modulation of removal code rate MCS item, and the corresponding MCS item for increasing 256QAM modulation；
And/or in the MCS table of the backward compatibility, one in equal multiple MCS of removal spectrum efficiency, And the corresponding MCS item for increasing 256QAM modulation.
Preferably, the MCS table for supporting 256QAM are as follows:
In the MCS table of the backward compatibility, the MCS item of the minimum several QPSK modulation of code rate is replaced with The MCS item of 256QAM modulation；
Alternatively, retaining the MCS item of the minimum several QPSK modulation of code rate in the MCS table of the backward compatibility It is constant, the MCS item of several QPSK modulation or 16QAM modulation is replaced with the MCS item of 256QAM modulation；
Alternatively, in the MCS table of the backward compatibility, within the set range by the spectrum efficiency obtained by interpolation MCS replace with the MCS item of 256QAM modulation；
Alternatively, when the CQI table for supporting 256QAM is CQI several in the CQI table for remove the backward compatibility And when increasing the CQI item of 256QAM modulation, in the MCS table of the backward compatibility, by MCS corresponding with the CQI of removal item Item replaces with the MCS item of 256QAM modulation；
And/or in the MCS table of the backward compatibility, by the highest one or several 64QAM modulation of code rate MCS, the corresponding MCS item for being substituted for 256QAM modulation；
It is right by one in equal multiple MCS of spectrum efficiency and/or in the MCS table of the backward compatibility The MCS item of 256QAM modulation should be replaced with；
And/or in the MCS table of the backward compatibility, retain IMCS=0 MCS item, by one or more IMCS> 0 MCS item, the corresponding MCS item for replacing with 256QAM modulation；Wherein, IMCSIndicate MCS index value.
Preferably, the MCS table for supporting 256QAM modulation are as follows: increase in the MCS table of the backward compatibility The MCS item of 256QAM modulation.
Preferably, when the UE according to support 256QAM modulation MCS Form Handle described in MCS information when, this method into One step includes:
Increase the bit number that the MCS information occupies, is used to indicate the MCS information reported in the support MCS index in the MCS table of 256QAM modulation；Alternatively,
The UE receives the deviant that base station is sent, and the MCS modulated according to the deviant in the support 256QAM Part MCS is extracted in table constitutes the MCS table actually used when handling the MCS information.
Preferably, when the UE supports 256QAM, if the DCI format of the detection is normal DCI format, in processing institute Using the MCS table for supporting 256QAM when stating MCS information；If the DCI format of detection is to return DCI format, the MCS is being handled The MCS table of backward compatibility is used when information.
Preferably, the UE, after receiving the down dispatch information, this method further comprises: by the downlink tune The RE mapping and QCL for spending the PDSCH of information instruction configure corresponding MCS table, as what is used when handling the MCS information MCS table；Wherein, it is that base station is preconfigured that each RE mapping of PDSCH and QCL, which configure corresponding MCS table,.
Preferably, the UE, after receiving the down dispatch information, this method further comprises: being detected according to UE (E) PDCCH for carrying the down dispatch information is determined positioned at USS or CSS to be used when handling the MCS information MCS table.
Preferably, the UE, after receiving the down dispatch information, this method further comprises: will be used to carry institute The corresponding MCS table of aggregation level for stating (E) PDCCH of down dispatch information, as what is used when handling the MCS information MCS table.
Preferably, being local or distribution according to the type of (E) PDCCH, determines and used when handling the MCS information MCS table.
Preferably, the UE, after receiving the down dispatch information, this method further comprises: will be used to carry institute The corresponding MCS table of EPDCCH collection where stating the EPDCCH of down dispatch information, as what is used when handling the MCS information MCS table；Wherein, it is preconfigured as base station to integrate corresponding MCS table by each EPDCCH of the UE.
Preferably, this method further comprises: downlink subframe being divided into multiple set, and to each downlink subframe collection It closes, the MCS table that the DCI of its downlink data transmission of configuration schedules is used；
After receiving the down dispatch information, this method further comprises the UE: the DCI information is used MCS table, the MCS table used as the processing MCS information.
A kind of subscriber terminal equipment, comprising: channel quality indicator CQI information measurement and reporting unit, down dispatch information Receiving unit, downlink data receives and processing unit；
The CQI information measurement and reporting unit, for measuring and believing to base station report down channel quality instruction CQI Breath；Wherein, the UE reports that the CQI believes according to the CQI table of backward compatibility or the CQI table for supporting 256QAM to modulate Breath；
The down dispatch information receiving unit, for receiving the down dispatch information of base station transmission；
The downlink data receives and processing unit, for according to the downlink control letter for including in the down dispatch information The modulation coding scheme MCS information in DCI is ceased, the downlink data that base station is sent correspondingly is received and handle；Wherein, the UE is pressed MCS table according to backward compatibility or MCS information described in the MCS Form Handle of support 256QAM modulation.
Using the present processes and equipment, the CQI table and MCS table for supporting 256QAM transmission can be generated, and It supports to be selected to use using the CQI/MCS table or selection of existing LTE standard according to the link state of UE to support 256QAM's CQI/MCS table, to optimize the performance of downlink transfer.
Detailed description of the invention
Fig. 1 is subframe structure schematic diagram；
Fig. 2 is the downlink transmission method flow chart of the application；
Fig. 3 is the schematic diagram that different CSI processes use different CQI tables；
Fig. 4 is the schematic diagram that different downlink subframe set corresponds to different MCS tables.
Specific embodiment
In order to which the purpose, technological means and advantage of the application is more clearly understood, the application is done below in conjunction with attached drawing It is further described.
The existing version of LTE only supports 3 kinds of modulation systems such as QPSK, 16QAM and 64QAM.This 3 kinds of modulation systems cover Various transmission demands in typical case.When supporting transmission and the fine channel condition when channel condition is very poor based on QPSK The transmission based on 64QAM.Only under the extra high scene of some SINR, just downlink transfer can be carried out based on 256QAM, To improve downlink peak rates.Even in fact, in the good situation of channel condition, it is contemplated that the dynamic of interference becomes Change, link declines fastly and declines slowly, corner-turning effect etc., and the link circuit condition of UE is also not the competent downlink based on 256QAM of total energy and passes It is defeated, that is to say, that need support 256QAM, 64QAM, the conversion between the modulation systems such as 16QAM and QPSK.In some cases, The downlink transfer of MCS table or CQI table in LTE existing version suitable UE；And in other cases, to support 256QAM and the MCS table or CQI table newly defined are more suitable for handling the downlink transfer of UE.
Fig. 2 is the specific flow chart of downlink transmission method in the application.As shown in Fig. 2, this method comprises:
Step 201:UE receives the configuration information that base station is sent, and correspondingly adjusts CQI table and MCS table；
It in step 201, is this guarantor using the CQI table and MCS table in existing LTE version under UE default condition The base station of existing LTE version and the base station of new LTE version can smoothly be accessed by having demonstrate,proved UE.In fact, because UE is reporting it Before ability, base station does not know whether UE supports the transmission of 256QAM, so at this moment system must be come according to LTE existing version Work.It, can be using height when base station knows that the link state of UE can support 256QAM to transmit to the UE for supporting 256QAM Layer signal deployment UE works in the mode for supporting 256QAM.At this moment, MCS table and CQI table will relative to existing LTE standard It is changed, the support to 256QAM is provided, relevant parameter needs are configured.Below in step 202 and step 203, Specifically describe the relevant parameter that may need to be arranged.
Step 202:UE is measured and to base station report downlink channel quality information, and UE can be according to backward compatibility here CQI table or the CQI table for supporting 256QAM modulation carry out report CQI information；
In step 202, by extending the CQI table of LTE existing version, increase the support to 256QAM.It is described below The preferred method of two kinds of configuration CQI tables.
First kind method is to be defined one or more based on the CQI table in LTE existing version and supported that 256QAM's is new CQI table.Remember that new CQI table number is N, then supports N+1 CQI table in the LTE system of new version.When needing to configure When UE uses 256QAM, base station is that UE configuration uses the CQI table for supporting 256QAM with high-level signaling.For example, if only defining The new CQI table of one support 256QAM can configure the CQI table or branch that UE uses existing LTE standard with 1 bit signalling Hold the CQI table of 256QAM.
Assuming that the average channel condition of a UE is fine, 256QAM can be supported, then the same UE is interior in very in short-term A possibility that bad channel state, is generally smaller.So a kind of generate supports that the CQI tableaux method of 256QAM is the existing CQI of removal Order of modulation in table is lower CQI some, and increases the item using 256QAM.The preferred side of the application is described below Method.Here, consistent with existing CQI table, CQI index 0 can serve to indicate that invalid CQI value, or in the table for supporting 256QAM In lattice, all 16 values all indicate effective CQI information.
In first kind method, a kind of method for supporting the CQI table of 256QAM that generates is in the existing CQI table of removal Minimum several CQI of spectrum efficiency, successively renumber the CQI item of remaining QPSK/16QAM/64QAM, then increase The item of 256QAM.For example, the index removed in existing CQI table is 5 the smallest, so as to increase by 5 support 256QAM's ?.Here, several CQI refer to it is CQI one or more.
The case where can supporting 256QAM to the channel of UE, declines to cope with the channel of UE there is a situation where deep, Ke Nengyou It is QPSK lower that necessity retains some code rates.In this way, another kind, which generates, to be supported when configuring the CQI table of 256QAM The method of the CQI table of 256QAM can be the several QPSK for retaining that code rate is minimum or relatively low in existing CQI table Under the premise of item is constant, but several QPSK even 16QAM are removed, other remaining QPSK/16QAM/64QAM's CQI successively renumber, and then increase the item of 256QAM.For example, the index 2~6 in existing CQI table is removed, so as to To increase by the item of 5 support 256QAM.
There are also a kind of methods for generating and supporting the CQI table of 256QAM can be pair on the basis of existing CQI table Lower CQI of spectrum efficiency increases the granularity of feedback, for example, it is CQI lower to spectrum efficiency, only retain every two CQI One in, i.e. removal CQI item 2,4,6 and 8；The CQI item of remaining QPSK/16QAM/64QAM successively renumbers, then Increase the item of 256QAM.Using this method, the CQI table of 256QAM is supported still to be able to cover all channel status, only It is to increase the lower CQI granularity of spectrum efficiency.
The above method is all to remove some items of existing CQI table and renumber to remaining CQI, is supported in definition When the new CQI table of 256QAM, it can also be that some items the CQI table to be removed directly replace with the item of 256QAM, and The order of modulation and spectrum efficiency of other CQI representative in CQI table are not changed.Specifically, corresponding removal CQI above The method of table entries can be and minimum some CQI of the spectrum efficiency in existing CQI table are replaced with using 256QAM's ?；Alternatively, being also possible to retain, code rate is minimum or relatively low in existing MCS table under the premise of several QPSK, The item of 256QAM is replaced with item even 16QAM of several QPSK；Alternatively, can be on the basis of existing CQI table CQI lower to spectrum efficiency increases the granularity of feedback, for example, it is CQI lower to spectrum efficiency, in every two CQI An item for replacing with 256QAM.
It is to reduce some lower CQI of spectrum efficiency to come in the method that the CQI table of 256QAM is supported in above-mentioned generation Indicate 256QAM.In fact, the CQI table in existing standard supports the code rate of 64QAM and up to 0.92, can be propped up in UE Under the premise of holding 256QAM, using 64QAM and up to 0.92 performance of code rate may be not optimize, and could alternatively be Some CQI items based on 256QAM transmission.That is, coming at mentioned above lower CQI of some spectrum efficiencies of reduction It indicates that the item of one or more highest 64QAM of code rate can also be removed except 256QAM to indicate 256QAM.Specifically Ground removes the item of one or more 64QAM to indicate the mode of 256QAM, can both be individually used for generating new CQI table, It can also be combined together with the mode of the lower CQI instruction 256QAM of aforementioned reduction spectrum efficiency, generate new CQI table Lattice.
Second class method is the item for increasing the CQI table in LTE existing version corresponding 256QAM, so that it is super to obtain length 16 long CQI tables are crossed, i.e., long CQI table contains the information of the CQI index more than 16.At this moment, since CQI table is long Degree is more than 16, it is therefore desirable to rethink the reporting schemes of CQI information.
A kind of reporting schemes can be bit number when increasing UE report CQI information, for example, by using 5 bit feedbacks CQI。
Alternatively, the CQI information bit number of 4 bits can also be kept constant, so as to directly reuse LTE existing version CQI reporting mechanism, further, UE feeds back a deviant while feeding back 4 Bit CQI information, is used to indicate base station Practical index of the CQI information reported in the long CQI table for supporting 256QAM modulation.For example, the value of 4 bit CQI of note is c, Deviant is v, and CQI value c, which is equal to 0, can still represent invalid CQI value；And it is equal to the CQI reality of 1~15, UE feedback to CQI value c Border index is the CQI index c+v in above-mentioned long CQI table.Deviant v can believe with the order instruction in the CSI feedback information of UE Breath (RI) carries out combined coding and feeds back on identical timing position.
Alternatively, 4 bit CQI can also be kept constant, so as to directly reuse the CQI reporting mechanism of LTE existing version, When needing to configure UE using 256QAM, base station is that UE configures the deviant v, UE of a CQI table according to partially with high-level signaling Shifting value v extracts 16 CQI in above-mentioned long CQI table, to form the CQI table of actual disposition this UE.For example, In the CQI table of this actual disposition, CQI value 0 can still represent invalid CQI value, and CQI value c(c is equal to 1~15) it can To be successively mapped as the CQI index c+v of above-mentioned long CQI table.
In LTE version 10, in order to support the technology of eICIC, the downlink subframe of cell can be divided into two set, this The channel status of two set is different, and correspondingly, can feed back CSI information respectively to the two sub-frame sets.That is base station The feedback information that UE reports two sub-frame sets respectively can be configured.The average SINR level of above-mentioned multiple sub-frame sets is usually Different.As shown in figure 3, corresponding macro base station is configured with the sub-frame set of ABSF by taking eICIC as an example, i.e., it is subject in cell Interference very little from macro base station, so the SINR of UE can be very big, it is possible to be suitble to the modulation system using 256QAM；And it is right Another sub-frame set, because macro base station has sent downlink control and downlink data, the SINR of UE is smaller, and possibly can not Support the modulation system of 256QAM.
The application proposes that when configuring multiple sub-frame sets of UE, the CQI that each sub-frame set uses is respectively configured in base station The information of table.New table is defined if it is to 256QAM, then the application is matched according to the SINR situation of this sub-frame set UE is set using the new CQI table of CQI table or support 256QAM in LTE existing version.If it is defining above-mentioned long CQI Table, then the application is to configure the offset that UE selects CQI index from long CQI table according to the SINR situation of this sub-frame set Value v.For example, CQI value 0 can still represent invalid CQI value, and CQI value c(c is equal to 1~15) it can successively be mapped as above-mentioned length The CQI index c+v of CQI table.In this way, base station can set each sub-frame set respectively when configuring the CSI method for reporting of UE Set the information for the CQI table that it is used.Correspondingly, UE receives the letter of base station CQI table respectively arranged to each sub-frame set Breath measures channel status to each sub-frame set, and feeds back CQI according to the CQI table that base station configures this sub-frame set Information.
In LTE version 11, in order to support the data of CoMP to transmit, configuration UE is further supported to report multiple CSI processes Feedback information, and each CSI process can be with two sub-frame sets of further division.In short, in existing LTE system, Through supporting configuration UE to feed back the feedback information of multiple CSI processes and multiple sub-frame sets.Above-mentioned multiple CSI processes and multiple subframes The average SINR of set is horizontal to be generally different.In a part of CSI process and sub-frame set, the SINR of UE can be very big, It is possible that being suitble to the modulation system using 256QAM；And in another part CSI process and sub-frame set, the SINR of UE compares It is small, it possibly can not support the modulation system of 256QAM.
The application proposes that when configuring multiple CSI processes of UE, the CQI table that each CSI process uses is respectively configured in base station The information of lattice.New table is defined if it is to 256QAM, then the application is to configure UE according to the SINR situation of this CSI process Using the new CQI table of CQI table or support 256QAM in LTE existing version.If it is defining above-mentioned long CQI table Lattice, then the application is to configure the deviant that UE selects CQI index from long CQI table according to the SINR situation of this CSI process v.For example, CQI value 0 can still represent invalid CQI value, and CQI value c(c is equal to 1~15) it can successively be mapped as above-mentioned length The CQI index c+v of CQI table.In this way, base station can set each CSI process respectively when configuring the CSI method for reporting of UE Set the information for the CQI table that it is used.Correspondingly, UE receives base station to the letter of the respectively arranged CQI table of each CSI process Breath measures channel status to each CSI process, and CQI letter is fed back to the CQI table of this CSI process configuration according to base station Breath.
The application is it is further proposed that each CSI is respectively configured when configuring the multiple CSI processes and sub-frame set of UE in base station The information for the CQI table that process and sub-frame set use.New table is defined if it is to 256QAM, then the application is according to one The SINR situation of a CSI process and sub-frame set configures UE using the CQI table in LTE existing version or supports 256QAM's New CQI table.If it is above-mentioned long CQI table is defined, then the application is the SINR according to a CSI process and sub-frame set Situation configuration UE selects the deviant v of CQI index from long CQI table.For example, CQI value 0 can still represent invalid CQI value, And CQI value c(c is equal to 1~15) it can successively be mapped as the CQI index c+v of above-mentioned long CQI table.In this way, base station is in configuration UE CSI method for reporting when, the information for the CQI table that it is used each CSI process and sub-frame set can be respectively set.Accordingly Ground, UE receive base station to the information of each CSI process and the respectively arranged CQI table of sub-frame set, to each CSI process and son Frame set measures channel status, and feeds back CQI letter according to the CQI table that base station configures this CSI process and sub-frame set Breath.
Step 203:UE receives the down dispatch information that base station is sent, and according to the MCS information in DCI information therein, The downlink data that base station is sent correspondingly is received and handles, here, UE can be according to the MCS table of backward compatibility or support The MCS table of 256QAM modulation handles the MCS information in DCI information.
In step 203, by extending the MCS table of LTE existing version, increase the support to 256QAM.It is described below The preferred method of two kinds of configuration MCS tables.
First kind method is to be defined one or more based on the MCS table in LTE existing version and supported that 256QAM's is new MCS table.Remember that new MCS table number is N, then supports N+1 MCS table in the LTE system of new version.Here, it supports The base station equipment of 256QAM can be divided into different grades, for example, simple equipment is only supported to make in less high code rate Use 256QAM；And complicated equipment can support very high code rate when using 256QAM.The support of corresponding different stage The base station equipment of 256QAM, can be with the MCS table of the different 256QAM of assignment configuration, this is the multiple support 256QAM of above-mentioned definition A reason.Alternatively, in order to simplify design, can also to the base station of all support 256QAM, only define one it is general New MCS table.When needing to configure UE using 256QAM, base station is that UE configuration uses the MCS for supporting 256QAM with high-level signaling Table.
Assuming that the average channel condition of a UE is fine, 256QAM can be supported, then the same UE is needed using modulation order A possibility that number lower modulation system, is generally smaller.So a kind of method for supporting the MCS table of 256QAM that generates is Except the order of modulation in existing MCS table is lower MCS some, and increase the item modulated using 256QAM.This is described below The preferred method of application.Here, consistent with existing MCS table, maximum several MCS values can only indicate order of modulation without Include TBS information.Just for the MCS item for indicating order of modulation and TBS while other in following description.
In first kind method, a kind of method for supporting the MCS table of 256QAM that generates is in the existing MCS table of removal Minimum some QPSK of code rate, successively renumber the MCS item of remaining QPSK/16QAM/64QAM since 0, Then increase the item of 256QAM.For example, the index removed in existing MCS table is 5 the smallest, so as to increase by 5 supports The item of 256QAM.
The case where can supporting 256QAM to the channel of UE, declines to cope with the channel of UE there is a situation where deep, Ke Nengyou It is QPSK lower that necessity retains several code rates.In this way, another kind, which generates, to be supported when configuring the MCS table of 256QAM The method of the MCS table of 256QAM can be the several QPSK for retaining that code rate is minimum or relatively low in existing MCS table Under the premise of item is constant, but several QPSK even 16QAM are removed, other remaining QPSK/16QAM/64QAM's MCS successively renumber, and then increase the item of 256QAM.For example, the index 2~6 in existing MCS table is removed, so as to To increase by the item of 5 support 256QAM.Here, several MCS refer to it is MCS one or more.
In addition, it is directly corresponding with the CQI item in CQI table for actually having some MCS in existing MCS table , and other MCS is obtained by interpolation, so there are also a kind of generate to support that the method for the MCS table of 256QAM can To be MCS item (such as the spectrum efficiency of the spectrum efficiency obtained by interpolation in the existing MCS table of removal within the specified range It is MCS lower), the MCS item of remaining QPSK/16QAM/64QAM is successively renumberd since 0, is then increased The item of 256QAM.For example, the index 1,3,5,7 and 9 in existing MCS table is removed, so as to increase by 5 support 256QAM's ?.
In fact, there are corresponding relationships with the MCS item in MCS table for the CQI item in CQI table, therefore, if When generating the CQI table for supporting 256QAM, several CQI in existing CQI table are eliminated, then correspondingly, can remove It is MCS corresponding with the CQI item that these are removed in existing MCS table, the MCS item of other remaining QPSK/16QAM/64QAM It successively renumbers, then increases the item of 256QAM.
The above method is all to remove some items of existing MCS table and renumber to remaining MCS, is supported in definition When the new MCS table of 256QAM, it can also be that several items the MCS table to be removed directly replace with the item of 256QAM, and Keep order of modulation and the TBS of other MCS representative in MCS table constant.Specifically, corresponding removal MCS table above The method of lattice item can be the relatively low QPSK item of the code rate in existing MCS table to replace with and be modulated using 256QAM Item；Alternatively, being also possible to retain the several QPSK premises that code rate is minimum or relatively low in existing MCS table Under, the item of 256QAM is replaced with item even 16QAM of some QPSK；Alternatively, being also possible in existing MCS table Lower MCS of the spectrum efficiency obtained by interpolation replaces with the item of 256QAM；Alternatively, being also possible to and generating support The method of the CQI table of 256QAM is consistent, in existing MCS table with these are removed corresponding MCS of CQI item replace with The item of 256QAM；Alternatively, because MCS index 0 is IMCS=0 has other specific uses, it is possible to avoid an IMCS=0 is again fixed Justice is the modulation system of instruction 256QAM, but one or more IMCSOther MCS of > 0 replaces with instruction 256QAM Item, which I the unlimited fixture body of the present invention useMCSThe modulation system of the MCS item instruction 256QAM of > 0.Here, using double When the transmission mode of transmission block (TB), for example, being by the way that a corresponding TB is arranged in 2A, 2B, 2C and 2D in DCI format 2 IMCS=0 and rvidx=1 come indicate currently without transmit this TB.If IMCS=0 is reused for instruction 256QAM modulation system, Will lead to cannot utilize rvidx=1 carries out HARQ re-transmission, so that the performance of 256QAM data transmission is influenced, so MCS index IMCS=0 can be not used in instruction 256QAM modulation system.
This method can guarantee not occurring when configuring and reconfiguring downlink transfer mode to the MCS information in DCI Obscure.Designed according to LTE system, to each downlink transfer mode, UE detects two kinds of DCI formats simultaneously, i.e., normal format and Return format.In this approach, when network configuration UE is using the MCS table for supporting 256QAM, two kinds of DCI formats be can be Simultaneously using the MCS table for supporting 256QAM.New MCS table to support 256QAM includes some MCS, the modulation represented It is identical for corresponding to the definition of MCS index in order and TBS and existing MCS table, so configuring and reconfiguring downlink transfer When mode, as long as being avoided using returning DCI format and using these two tables MCS consistent to the MCS in DCI Information is obscured.
It is to reduce some lower MCS of order of modulation to come in the method that the MCS table of 256QAM is supported in above-mentioned generation Indicate the modulation system of 256QAM.In fact, the MCS table in existing standard supports the code rate of 64QAM and up to 0.92, Under the premise of UE can support 256QAM, using 64QAM and up to 0.92 performance of code rate may be not optimize, It could alternatively be some MCS items based on 256QAM transmission.That is, in some modulation orders of the application reduction mentioned above Lower MCS is counted to indicate except 256QAM, the item that can also remove one or more highest 64QAM of code rate comes The modulation system of instruction 256QAM and corresponding TBS.Specifically, the item of one or more 64QAM is removed to indicate 256QAM Mode, can both be individually used for generating new MCS table, can also with aforementioned reduction order of modulation it is lower MCS instruction The mode of 256QAM is combined together, and generates new MCS table.
In addition, in existing MCS table, MCS item equal there are some spectrum efficiencies but different modulation system.I.e. The spectrum efficiency of MCS index 10 and 11 is equal but QPSK and 16QAM is respectively adopted, and the spectrum efficiency of MCS index 16 and 17 is equal, but It is that 16QAM and 64QAM is respectively adopted.One in two equal MCS of spectrum efficiency can be removed, to obtain a code word To indicate that 256QAM is transmitted.For example, spectrum efficiency is equal but the lower item of order of modulation for removal.It, can be with using this method Two code words are obtained to be used to indicate 256QAM transmission.
Second class method is the item for increasing the MCS table in LTE existing version corresponding 256QAM, thus it is super to length 32 long MCS tables are crossed, i.e., long MCS table contains the information of the MCS index more than 32.At this moment, since MCS table is long Degree is more than 32, it is therefore desirable to rethink the representation of MCS information.
A kind of representation can be the bit number of the MCS information occupancy in increase DCI format, compare for example, by using 6 Spy supports MCS information.
Alternatively, 5 bit MCS can also be kept constant, so as to directly reuse the DCI format of LTE existing version；Into one Step ground, when needing to configure UE using 256QAM, base station deviant v, the UE root that high-level signaling is that UE configures a MCS table The 32 MCS MCS tables for forming actual disposition this UE are extracted in above-mentioned long MCS table according to deviant v.For example, Consistent with existing MCS tableau format in the CQI table of this actual disposition, the MCS value 28,29,30 and 31 in DCI is distinguished Instruction order of modulation is that 2,4,6 and 8(respectively corresponds QPSK, 16QAM, 64QAM and 256QAM), and the MCS value m(m in DCI Equal to 0~27) it can successively be mapped as the MCS index m+v of above-mentioned long MCS table.The support 256QAM's of corresponding different stage Base station equipment can configure different deviant v for UE, to optimize down-link performance.
Described above is the MCS table generation methods for supporting 256QAM modulation.To the UE for supporting 256QAM, use is existing The MCS table of LTE standard supports the MCS table of 256QAM to be configurable.In some cases, in LTE existing version MCS table suitable UE downlink transfer；And in other cases, the MCS table newly defined to support 256QAM It is particularly suited for improving the peak value downlink transmission rate of UE.Be described below the existing LTE standard of configuration of the application MCS table or The method that person supports the MCS table of 256QAM.
It is designed according to LTE system, to each downlink transfer mode, UE detects two kinds of DCI formats, i.e. normal format simultaneously With recurrence format.Normal DCI format is the normal data transfer for completing this transmission mode.It uses UE is needed to configure The case where 256QAM, it is clear that normal DCI format is able to support 256QAM's.And it is less to return the general bit number of DCI format, Reliability is higher, and supports the conversion between downlink transfer mode.As it can be seen that pursuing peak value downstream rate is not to return DCI lattice The main application of formula.
The application proposes that the normal DCI format detected to UE and recurrence DCI format can use different MCS tables respectively Lattice.Specifically, the UE of 256QAM is supported configuration, and the MCS for supporting 256QAM can be used in the domain MCS in normal DCI format Table, it can configure the MCS table using existing LTE standard by high-level signaling or support the MCS table of 256QAM One of；And return that the domain MCS in DCI format is still consistent with existing LTE standard, i.e., using the MCS table in existing LTE standard Lattice.Base station according to normal DCI format selected to use or returns DCI format, according to this Shen when dispatching downlink data are transmitted Method choice MCS table please is come the domain MCS that is arranged in DCI.Correspondingly, UE is when blind examination measures (E) PDCCH, if UE is blind Detect (E) PDCCH of normal DCI format, it is assumed that high-level signaling is configured with the MCS table for supporting 256QAM, then according to support The new MCS table of 256QAM parses the MCS information in DCI, otherwise, parses according to the MCS table in existing LTE standard MCS information in DCI；If UE blind examination measures (E) PDCCH for returning DCI format, according to the MCS table in existing LTE standard Lattice parse the MCS information in DCI.
Using this method, regardless of whether UE is configured with the downlink transfer of 256QAM, return DCI format be with it is existing LTE standard is consistent, to guarantee not occurring when configuring and reconfiguring downlink transfer mode to the mixed of the MCS information in DCI Confuse.
According to the specification of LTE version 11, to transmission mode 10, system can be configured by high-level signaling 4 kinds it is different The configuration information of the RE mapping and standard co-located (QCL) of PDSCH, and current PDSCH is indicated by 2 bits in DCI format Transmission is configured using any RE mapping and QCL.Every kind of different RE mapping and QCL configuration, the physical layer being directed to are passed Transferring technology can be different, such as can be multi-point joint transmission (JT), is also possible to coordinated multi-point transmission (CS/CB). Using different transmission technologys, link state is also different.For example, SINR when using JT is likely to be greater than CS/CB, It is possible to the MCS table for supporting 256QAM can be used when using JT, and when using CS/CB, be suitable only for using Existing MCS table.
The application proposes when configuring the RE of PDSCH of UE mapping and QCL configuration, at the same be respectively configured each RE mapping and The MCS table used corresponding to QCL configuration.Base station selects the UE PDSCH's to be used when dispatching downlink data are transmitted RE mapping and QCL, which match, to be postponed, the domain MCS being arranged in DCI according to the MCS table for configuring this RE mapping and QCL configuration.Accordingly Ground, UE determine MCS table according to the RE of the PDSCH of its instruction mapping and QCL configuration after blind examination measures (E) PDCCH Lattice, and parse the MCS information in DCI.
It is designed according to LTE system, UE needs (E) PDCCH that blind Detecting base station is sent in two search spaces, i.e., in public affairs Search space (CSS) and the specific search space UE (USS) altogether.(E) PDCCH transmitted in USS is usually triggering UE specific PDSCH transmission, and CSS is generally used for sending public (E) PDCCH of some cells.In addition, to the bit number in USS and CSS Equal DCI format, (E) PDCCH in CSS can also trigger the specific PDSCH transmission of UE.256QAM's is supported to configuration (E) PDCCH in UE, USS is required to support 256QAM；And to (E) PDCCH in CSS, it does not need using support 256QAM MCS table.Alternatively, supporting configuration the UE of 256QAM, (E) PDCCH in USS is required to support 256QAM；And it is right CSS can have the setting of different MCS tables according to the purposes of its (E) PDCCH sent.
The application proposes that (E) PDCCH detected according to UE is to be located at USS or CSS to determine MCS table to be used. Specifically, the MCS table for supporting 256QAM can be used to (E) PDCCH in USS in the UE for supporting configuration 256QAM, The MCS table using existing LTE standard can be configured by high-level signaling or supports one of the MCS table of 256QAM； To (E) PDCCH in CSS, the fixed MCS table using existing LTE standard.Base station is when dispatching downlink data are transmitted, to USS With (E) PDCCH in CSS, the domain MCS for selecting MCS table to be arranged in DCI according to the present processes.Correspondingly, UE is blind When detecting (E) PDCCH, to (E) PDCCH in USS, it is assumed that high-level signaling is configured with the MCS table for supporting 256QAM, can be with It is to parse the MCS information in DCI according to the MCS table of 256QAM is supported, otherwise, according to the MCS table in existing LTE standard To parse the MCS information in DCI；To (E) PDCCH in CSS, then DCI is parsed according to the MCS table in existing LTE standard In MCS information.
Alternatively, the UE of 256QAM is supported configuration, to (E) PDCCH in USS, can be used the MCS table for supporting 256QAM Lattice, it can configured by high-level signaling using existing LTE standard MCS table or support 256QAM MCS table it One；To (E) PDCCH in CSS, if its DCI is that cell is specific, such as schedule broadcast information, paging information or RACH Response message (RAR), then its use existing LTE standard MCS table；To (E) PDCCH in CSS, if its DCI is UE spy Fixed, then the MCS table for supporting 256QAM can be used.Base station is when dispatching downlink data are transmitted, to (E) in USS and CSS PDCCH, the domain MCS for selecting MCS table to be arranged in DCI according to the present processes.Correspondingly, UE measures (E) in blind examination When PDCCH, to (E) PDCCH in USS, it is assumed that high-level signaling is configured with the MCS table for supporting 256QAM, can be according to branch The MCS table of 256QAM is held to parse the MCS information in DCI, otherwise, is parsed according to the MCS table in existing LTE standard MCS information in DCI；To (E) PDCCH in CSS, if its DCI is that cell is specific, according in existing LTE standard MCS table parses the MCS information in DCI；To (E) PDCCH in CSS, if its DCI is UE specific, it is assumed that high level letter The MCS table for being configured with and supporting 256QAM is enabled, then can be according to the MCS table of 256QAM is supported and parse the letter of the MCS in DCI Breath, otherwise, the MCS information in DCI is parsed according to the MCS table in existing LTE standard.
In LTE system, (E) PDCCH is polymerized with one or more (E) CCE.In general, when When the down channel quality of UE is preferable, smaller aggregation level can be used；And to UE downlink quality it is poor when, It needs using bigger aggregation level.Correspondingly, to downlink data transmission, when downlink quality is preferable, it is possible to can Using the modulation system of 256QAM；And when downlink quality is poor, it cannot generally use 256QAM modulation system.
The application proposes to determine the MCS table that DCI is used according to the aggregation level of (E) PDCCH.For example, aggregation level Less than (E) PDCCH of K using the new MCS table for supporting 256QAM, aggregation level uses existing more than or equal to (E) PDCCH of K MCS table.Base station determines the aggregation level of (E) PDCCH according to the downlink status of UE when dispatching downlink data are transmitted, And the domain MCS being arranged in DCI according to the present processes selection MCS table.Correspondingly, UE measures one (E) in blind examination After PDCCH, the domain MCS in DCI is parsed according to its aggregation level and obtains the modulation system and TBS of base station scheduling.
In LTE system, two kinds of EPDCCH is defined, i.e. partial style EPDCCH and distribution EPDCCH.Generally Say that local EPDCCH is suitable for the more accurate channel status instruction that base station can obtain the different frequency sub-bands of UE in ground (CSI) the case where information, to obtain frequency scheduling gain；Accordingly, when base station does not have the accurate CSI information of UE, base station is not It obtains EPDCCH not to be dispersed on multiple PRB pairs and send, to obtain frequency diversity gain, i.e. distribution EPDCCH.Base station is sent out The case where sending local EPDCCH can use 256QAM because CSI information is more accurate to further increase down peak magnitude speed Rate；And the case where distribution EPDCCH is sent to base station, general CSI information is less accurate, and the MCS table of existing LTE standard is just Good performance can be provided.
The application proposes to determine the MCS table that DCI is used according to the type (local or distributed) of (E) PDCCH. Specifically, the new MCS table for supporting 256QAM can be used in the alternative EPDCCH that configuration partial style EPDCCH is concentrated, it can The MCS table using existing LTE standard is configured by high-level signaling or supports one of the MCS table of 256QAM；And it is distributed The alternative EPDCCH that formula EPDCCH is concentrated uses existing MCS table.Base station is when dispatching downlink data are transmitted, according to the downlink of UE Link state selects the type (local or distributed) of EPDCCH, and selects MCS table to set according to the present processes Set the domain MCS in DCI.Correspondingly, UE is after blind examination measures an EPDCCH, and according to the type of EPDCCH, (partial style is divided Cloth) parsed according to the present processes the domain MCS in DCI obtain base station scheduling modulation system and TBS.
In LTE version 11, support to configure 2 EPDCCH collection to a UE.Also, to downlink transfer mode 10, each The RE mapping and QCL configuration of EPDCCH collection are consistent with a kind of RE of PDSCH mapping and QCL configuration.To every kind of PDSCH RE mapping and QCL configuration, the physical layer transmission technology being directed to can be different, and correspondingly its link state is also not The same.For example, SINR when using JT is likely to be greater than CS/CB, it is possible to support can be used when using JT The MCS table of 256QAM, and when using CS/CB, it is suitable only for using existing MCS table.In this way, EPDCCH collection and transmission Link state when PDSCH can have certain corresponding relationship.
The application proposes each EPDCCH collection of UE can be respectively configured using different MCS tables, that is, is configuring When the parameter of EPDCCH collection, further configures it and use the MCS table of existing LTE standard or the MCS table of support 256QAM One of.DCI information is transmitted when dispatching downlink data are transmitted, in an alternative EPDCCH of an EPDCCH collection of UE in base station, And the domain MCS being arranged in DCI according to the MCS table of the EPDCCH collection of selection configuration.Correspondingly, UE measures one in blind examination (E) after PDCCH, EPDCCH collection belonging to it determines MCS table, and parses the MCS information in DCI.
In LTE version 10, in order to support the technology of eICIC, the downlink subframe of cell can be divided into two set, this The channel status of two set is different.For example, as shown in figure 4, corresponding macro base station is configured with the sub-frame set of ABSF, i.e., it is small The interference very little from macro base station being subject in cell, so the SINR of UE can be very big, it is possible to be suitble to using 256QAM's Modulation system；And to the set of other subframes, because macro base station has sent downlink control and downlink data, the SINR ratio of UE It is smaller, it possibly can not support the modulation system of 256QAM.
The application proposes that network can be divided into downlink subframe multiple set, for example, different downlink subframe set by dry Disturb degree difference；And to each downlink subframe set, MCS table that the DCI of its downlink data transmission of configuration schedules is used.If It is that new table is defined to 256QAM, then the application is that UE is configured according to the SINR situation of each downlink subframe set using LTE The new MCS table of MCS table or support 256QAM in existing version.If it is above-mentioned long MCS table is defined, then this Shen It please be that the deviant v that UE selects MCS index from long MCS table is configured according to the SINR situation of each downlink subframe set.UE After receiving the above-mentioned configuration information to the MCS table of different sub-frame sets, passed detecting the dispatching downlink in a sub-frame set When defeated DCI format, the modulation system and TBS of base station scheduling are parsed according to the MCS table that network configures sub-frame set.
Present invention also provides subscriber terminal equipment, it can be used for implementing above-mentioned downlink transmission method.User in the application The specific structure of terminal device includes: that CQI information measurement and reporting unit, down dispatch information receiving unit, downlink data connect Receipts and processing unit.
Wherein, CQI information measurement and reporting unit, for measuring and believing to base station report down channel quality instruction CQI Breath；Here, UE can report that above-mentioned CQI believes according to the CQI table of backward compatibility or the CQI table for supporting 256QAM to modulate Breath.
Down dispatch information receiving unit, for receiving the down dispatch information of base station transmission.
Downlink data receives and processing unit, for according to the MCS information in the DCI for including in down dispatch information, phase Receive and handle the downlink data of base station transmission with answering；Here, UE can be according to the MCS table of backward compatibility or support The MCS Form Handle MCS information of 256QAM modulation.
By the specific implementation of above-mentioned the application as it can be seen that the CQI table and MCS table of supporting 256QAM transmission can be generated, And it supports to be selected to use using the CQI/MCS table or selection of existing LTE standard according to the link state of UE to support The CQI/MCS table of 256QAM, to optimize the performance of downlink transfer.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention Within mind and principle, any modification, equivalent substitution, improvement and etc. done be should be included within the scope of the present invention.

Claims (40)

1. a kind of downlink transmission method, comprising:
UE measurement simultaneously indicates CQI information to base station report down channel quality；Wherein, the UE according to backward compatibility CQI table Lattice support the CQI table of 256QAM modulation to report the CQI information；The CQI table be according to sub-frame set and/or CSI process is configured；
The UE receives the down dispatch information that base station is sent, and according to the modulating-coding in Downlink Control Information DCI therein Mode MCS information correspondingly receives and handles the downlink data that base station is sent；Wherein, the UE according to backward compatibility MCS table Lattice support MCS information described in the MCS Form Handle of 256QAM modulation；When the UE supports 256QAM, if the DCI of detection Format is normal DCI format, is determined according to high-level signaling using the MCS table for supporting 256QAM when handling the MCS information Or the MCS table of backward compatibility；If detection DCI format be return DCI format, when handling the MCS information after use to Compatible MCS table.
2. the method according to claim 1, wherein the CQI table for supporting 256QAM modulation are as follows:
In the CQI table of the backward compatibility, minimum several CQI of removal spectrum efficiency, and corresponding increase 256QAM tune The CQI item of system；
Alternatively, in the CQI table of the backward compatibility, retain code rate minimum several CQI it is constant, removal is several The CQI item of QPSK modulation or 16QAM modulation, and the corresponding CQI item for increasing 256QAM modulation；
Alternatively, in the CQI table of the backward compatibility, to the grain of the CQI item increase feedback of spectrum efficiency within the set range Degree, and the corresponding CQI item for increasing 256QAM modulation；
And/or in the CQI table of the backward compatibility, the CQI item of the highest several 64QAM modulation of removal code rate, and The corresponding CQI item for increasing 256QAM modulation.
3. the method according to claim 1, wherein the CQI table for supporting 256QAM modulation are as follows:
In the CQI table of the backward compatibility, minimum several CQI of removal spectrum efficiency are substituted for what 256QAM was modulated CQI；
Alternatively, in the CQI table of the backward compatibility, retain code rate minimum several CQI it is constant, several modulation Mode is that the CQI item of QPSK or 16QAM is substituted for the CQI item of 256QAM modulation；
Alternatively, part CQI of spectrum efficiency within the set range is substituted in the CQI table of the backward compatibility The CQI item of 256QAM modulation；
And/or in the CQI table of the backward compatibility, by the CQI of the highest one or several 64QAM modulation of code rate , the corresponding CQI item for being substituted for 256QAM modulation.
4. the method according to claim 1, wherein the CQI table for supporting 256QAM modulation are as follows: described Increase the CQI item of 256QAM modulation in the CQI table of backward compatibility.
5. according to the method described in claim 4, it is characterized in that, when the UE is according to the CQI table for supporting 256QAM modulation Come when reporting the CQI information, this method further comprises:
Increase the bit number that the CQI information occupies, is used to indicate the CQI information reported in the support 256QAM tune CQI index in the CQI table of system；Alternatively,
The UE reports a deviant to the base station when reporting the CQI information, is used to indicate CQI information described in base station Practical index in the CQI table of the support 256QAM modulation；Alternatively,
The UE receives the deviant that base station is sent, and the CQI table modulated according to the deviant in the support 256QAM It is middle to extract the part CQI CQI table actually used when constituting the report CQI information.
6. according to claim 1 to any method in 5, which is characterized in that this method further comprises: UE receives base station The CQI table that corresponding sub-frame set uses is respectively configured for each sub-frame set of the UE；
The CQI table that the UE is used according to sub-frame set belonging to the CQI information reports the CQI information.
7. according to the method described in claim 6, it is characterized in that, the CQI table that each sub-frame set of the UE uses is According to the configuration of the SINR situation of corresponding sub-frame set.
8. according to claim 1 to any method in 5, which is characterized in that this method further comprises: UE receives base station The CQI table used for the corresponding CSI process that each CSI process of the UE is respectively configured；
The UE reports the CQI information according to the CQI table that CSI process belonging to the CQI information uses.
9. according to claim 1 to any method in 5, which is characterized in that this method further comprises: UE receives base station The CQI table that the corresponding each CSI process and sub-frame set being respectively configured for each CSI process and sub-frame set of the UE use Lattice；
The UE reports the CQI information according to the CQI table that CSI process and sub-frame set belonging to the CQI information use.
10. according to claim 1 to any method in 5, which is characterized in that this method further comprises: UE receives base It stands the configuration information sent, for configuring the UE using the CQI table for the CQI table or backward compatibility for supporting 256QAM modulation Report the CQI information.
11. the method according to claim 1, wherein the MCS table for supporting 256QAM modulation are as follows:
In the MCS table of the backward compatibility, the MCS item of the minimum several QPSK modulation of removal code rate, and increase The MCS item of 256QAM modulation；
Alternatively, the MCS item for retaining the minimum several QPSK modulation of code rate is constant in the MCS table of the backward compatibility, The MCS item of several QPSK modulation or 16QAM modulation is removed, and increases the MCS item of 256QAM modulation；
Alternatively, in the MCS table of the backward compatibility, spectrum efficiency that removal is obtained by interpolation is within the set range MCS, and increase the MCS item of 256QAM modulation；
Alternatively, when the CQI table for supporting 256QAM is several CQI Xiang Bingzeng in the CQI table for remove the backward compatibility When the CQI item for adding 256QAM to modulate, in the MCS table of the backward compatibility, MCS corresponding with the CQI of removal item are gone It removes, and increases the MCS item of 256QAM modulation；
And/or in the MCS table of the backward compatibility, the MCS item of the highest several 64QAM modulation of removal code rate, and The corresponding MCS item for increasing 256QAM modulation；
And/or in the MCS table of the backward compatibility, one in equal multiple MCS of removal spectrum efficiency, and it is right The MCS item of 256QAM modulation should be increased.
12. the method according to claim 1, wherein the MCS table for supporting 256QAM are as follows:
In the MCS table of the backward compatibility, the MCS item of the minimum several QPSK modulation of code rate is replaced with into 256QAM The MCS item of modulation；
Alternatively, the MCS item for retaining the minimum several QPSK modulation of code rate is constant in the MCS table of the backward compatibility, The MCS item of several QPSK modulation or 16QAM modulation is replaced with the MCS item of 256QAM modulation；
Alternatively, in the MCS table of the backward compatibility, by the MCS of the spectrum efficiency obtained by interpolation within the set range Item replaces with the MCS item of 256QAM modulation；
Alternatively, when the CQI table for supporting 256QAM is several CQI Xiang Bingzeng in the CQI table for remove the backward compatibility When the CQI item for adding 256QAM to modulate, in the MCS table of the backward compatibility, MCS corresponding with the CQI of removal item are replaced It is changed to the MCS item of 256QAM modulation；
And/or in the MCS table of the backward compatibility, by the MCS of the highest one or several 64QAM modulation of code rate , the corresponding MCS item for being substituted for 256QAM modulation；
And/or in the MCS table of the backward compatibility, by one in equal multiple MCS of spectrum efficiency, correspondence is replaced It is changed to the MCS item of 256QAM modulation；
And/or in the MCS table of the backward compatibility, retain IMCS=0 MCS item, by one or more IMCS> 0 MCS, the corresponding MCS item for replacing with 256QAM modulation；Wherein, IMCSIndicate MCS index value.
13. the method according to claim 1, wherein the MCS table for supporting 256QAM modulation are as follows: in institute State the MCS item for increasing 256QAM modulation in the MCS table of backward compatibility.
14. according to the method for claim 13, which is characterized in that when the UE is according to the MCS table for supporting 256QAM modulation When lattice handle the MCS information, this method further comprises:
Increase the bit number that the MCS information occupies, is used to indicate the MCS information reported in the support 256QAM tune MCS index in the MCS table of system；Alternatively,
The UE receives the deviant that base station is sent, and the MCS table modulated according to the deviant in the support 256QAM It is middle to extract the part MCS MCS table actually used when constituting the processing MCS information.
15. any method in 1 to 14 according to claim 1, which is characterized in that the UE is receiving the downlink tune After spending information, this method further comprises: the RE mapping for the PDSCH that the down dispatch information is indicated is corresponding with QCL configuration MCS table, as the MCS table that uses when handling the MCS information；Wherein, each RE mapping and QCL configuration of PDSCH Corresponding MCS table is that base station is preconfigured.
16. any method in 1 to 14 according to claim 1, which is characterized in that the UE is receiving the downlink tune After spending information, this method further comprises: what it is according to UE detection is position for carrying (E) PDCCH of the down dispatch information The MCS table used when handling the MCS information is determined in USS or CSS.
17. any method in 1 to 14 according to claim 1, which is characterized in that the UE is receiving the downlink tune After spending information, this method further comprises: the aggregation level that will be used to carry (E) PDCCH of the down dispatch information is corresponding MCS table, as the MCS table that uses when handling the MCS information.
18. any method in 1 to 14 according to claim 1, which is characterized in that according to the type of (E) PDCCH be part Formula or distribution determine the MCS table used when handling the MCS information.
19. any method in 1 to 14 according to claim 1, which is characterized in that the UE is receiving the downlink tune After spending information, this method further comprises: by the EPDCCH collection pair where the EPDCCH for being used to carry the down dispatch information The MCS table answered, as the MCS table used when handling the MCS information；Wherein, each EPDCCH collection of the UE is corresponding MCS table be base station it is preconfigured.
20. any method in 1 to 14 according to claim 1, which is characterized in that this method further comprises: downlink Sub-frame division is multiple set, and to each downlink subframe set, the MCS that the DCI of its downlink data transmission of configuration schedules is used Table；
After receiving the down dispatch information, this method further comprises the UE: the MCS that the DCI information is used Table, the MCS table used as the processing MCS information.
21. a kind of subscriber terminal equipment UE characterized by comprising channel quality indicator CQI information measurement and reporting unit, Down dispatch information receiving unit, downlink data receives and processing unit；
The CQI information measurement and reporting unit, for measuring and indicating CQI information to base station report down channel quality；Its In, the UE reports the CQI information according to the CQI table of backward compatibility or the CQI table for supporting 256QAM to modulate；Institute Stating CQI table is configured according to sub-frame set and/or CSI process；
The down dispatch information receiving unit, for receiving the down dispatch information of base station transmission；
The downlink data receives and processing unit, for according to the Downlink Control Information for including in the down dispatch information Modulation coding scheme MCS information in DCI correspondingly receives and handles the downlink data that base station is sent；Wherein, the UE according to The MCS table of backward compatibility supports MCS information described in the MCS Form Handle of 256QAM modulation；When the UE is supported When 256QAM, if the DCI format of detection is normal DCI format, is determined and used according to high-level signaling when handling the MCS information Support the MCS table of 256QAM or the MCS table of backward compatibility；If the DCI format of detection is to return DCI format, in processing institute The MCS table of backward compatibility is used when stating MCS information.
22. subscriber terminal equipment UE according to claim 21, which is characterized in that the CQI for supporting 256QAM modulation Table are as follows:
In the CQI table of the backward compatibility, minimum several CQI of removal spectrum efficiency, and corresponding increase 256QAM tune The CQI item of system；
Alternatively, in the CQI table of the backward compatibility, retain code rate minimum several CQI it is constant, removal is several The CQI item of QPSK modulation or 16QAM modulation, and the corresponding CQI item for increasing 256QAM modulation；
Alternatively, in the CQI table of the backward compatibility, to the grain of the CQI item increase feedback of spectrum efficiency within the set range Degree, and the corresponding CQI item for increasing 256QAM modulation；
And/or in the CQI table of the backward compatibility, the CQI item of the highest several 64QAM modulation of removal code rate, and The corresponding CQI item for increasing 256QAM modulation.
23. subscriber terminal equipment UE according to claim 21, which is characterized in that the CQI for supporting 256QAM modulation Table are as follows:
In the CQI table of the backward compatibility, minimum several CQI of removal spectrum efficiency are substituted for what 256QAM was modulated CQI；
Alternatively, in the CQI table of the backward compatibility, retain code rate minimum several CQI it is constant, several modulation Mode is that the CQI item of QPSK or 16QAM is substituted for the CQI item of 256QAM modulation；
Alternatively, part CQI of spectrum efficiency within the set range is substituted in the CQI table of the backward compatibility The CQI item of 256QAM modulation；
And/or in the CQI table of the backward compatibility, by the CQI of the highest one or several 64QAM modulation of code rate , the corresponding CQI item for being substituted for 256QAM modulation.
24. subscriber terminal equipment UE according to claim 21, which is characterized in that the CQI for supporting 256QAM modulation Table are as follows: increase the CQI item of 256QAM modulation in the CQI table of the backward compatibility.
25. subscriber terminal equipment UE according to claim 24, which is characterized in that when the UE is according to support 256QAM tune The CQI table of system is come when reporting the CQI information, the CQI information measurement and reporting unit further comprise:
Increase the bit number that the CQI information occupies, is used to indicate the CQI information reported in the support 256QAM tune CQI index in the CQI table of system；Alternatively,
The UE reports a deviant to the base station when reporting the CQI information, is used to indicate CQI information described in base station Practical index in the CQI table of the support 256QAM modulation；Alternatively,
The UE receives the deviant that base station is sent, and the CQI table modulated according to the deviant in the support 256QAM It is middle to extract the part CQI CQI table actually used when constituting the report CQI information.
26. according to the subscriber terminal equipment UE any in claim 21 to 25, which is characterized in that the CQI information is surveyed Amount and reporting unit further comprise: corresponding sub-frame set, which is respectively configured, in each sub-frame set that UE reception base station is the UE makes CQI table；
The CQI table that the UE is used according to sub-frame set belonging to the CQI information reports the CQI information.
27. subscriber terminal equipment UE according to claim 26, which is characterized in that each sub-frame set of the UE uses CQI table be to be configured according to the SINR situation of corresponding sub-frame set.
28. according to the subscriber terminal equipment UE any in claim 21 to 25, which is characterized in that the CQI information is surveyed Amount and reporting unit further comprise: UE, which receives the corresponding CSI process that each CSI process that base station is the UE is respectively configured, to be made CQI table；
The UE reports the CQI information according to the CQI table that CSI process belonging to the CQI information uses.
29. according to the subscriber terminal equipment UE any in claim 21 to 25, which is characterized in that the CQI information is surveyed Amount and reporting unit further comprise: UE receives the phase that each CSI process that base station is the UE and sub-frame set are respectively configured The CQI table for answering each CSI process and sub-frame set to use；
The UE reports the CQI information according to the CQI table that CSI process and sub-frame set belonging to the CQI information use.
30. according to the subscriber terminal equipment UE any in claim 21 to 25, which is characterized in that the CQI information is surveyed Measure and reporting unit further comprises: UE receives the configuration information that base station is sent, for configuring the UE using support 256QAM CQI information described in the CQI table of modulation or the CQI tabular report of backward compatibility.
31. subscriber terminal equipment UE according to claim 21, which is characterized in that the MCS for supporting 256QAM modulation Table are as follows:
In the MCS table of the backward compatibility, the MCS item of the minimum several QPSK modulation of removal code rate, and increase The MCS item of 256QAM modulation；
Alternatively, the MCS item for retaining the minimum several QPSK modulation of code rate is constant in the MCS table of the backward compatibility, The MCS item of several QPSK modulation or 16QAM modulation is removed, and increases the MCS item of 256QAM modulation；
Alternatively, in the MCS table of the backward compatibility, spectrum efficiency that removal is obtained by interpolation is within the set range MCS, and increase the MCS item of 256QAM modulation；
Alternatively, when the CQI table for supporting 256QAM is several CQI Xiang Bingzeng in the CQI table for remove the backward compatibility When the CQI item for adding 256QAM to modulate, in the MCS table of the backward compatibility, MCS corresponding with the CQI of removal item are gone It removes, and increases the MCS item of 256QAM modulation；
And/or in the MCS table of the backward compatibility, the MCS item of the highest several 64QAM modulation of removal code rate, and The corresponding MCS item for increasing 256QAM modulation；
And/or in the MCS table of the backward compatibility, one in equal multiple MCS of removal spectrum efficiency, and it is right The MCS item of 256QAM modulation should be increased.
32. subscriber terminal equipment UE according to claim 21, which is characterized in that the MCS table for supporting 256QAM Are as follows:
In the MCS table of the backward compatibility, the MCS item of the minimum several QPSK modulation of code rate is replaced with into 256QAM The MCS item of modulation；
Alternatively, the MCS item for retaining the minimum several QPSK modulation of code rate is constant in the MCS table of the backward compatibility, The MCS item of several QPSK modulation or 16QAM modulation is replaced with the MCS item of 256QAM modulation；
Alternatively, in the MCS table of the backward compatibility, by the MCS of the spectrum efficiency obtained by interpolation within the set range Item replaces with the MCS item of 256QAM modulation；
Alternatively, when the CQI table for supporting 256QAM is several CQI Xiang Bingzeng in the CQI table for remove the backward compatibility When the CQI item for adding 256QAM to modulate, in the MCS table of the backward compatibility, MCS corresponding with the CQI of removal item are replaced It is changed to the MCS item of 256QAM modulation；
And/or in the MCS table of the backward compatibility, by the MCS of the highest one or several 64QAM modulation of code rate , the corresponding MCS item for being substituted for 256QAM modulation；
And/or in the MCS table of the backward compatibility, by one in equal multiple MCS of spectrum efficiency, correspondence is replaced It is changed to the MCS item of 256QAM modulation；
And/or in the MCS table of the backward compatibility, retain IMCS=0 MCS item, by one or more IMCS> 0 MCS, the corresponding MCS item for replacing with 256QAM modulation；Wherein, IMCSIndicate MCS index value.
33. subscriber terminal equipment UE according to claim 21, which is characterized in that the MCS for supporting 256QAM modulation Table are as follows: increase the MCS item of 256QAM modulation in the MCS table of the backward compatibility.
34. subscriber terminal equipment UE according to claim 33, which is characterized in that when the UE is according to support 256QAM tune When MCS information described in the MCS Form Handle of system, the CQI information measurement and reporting unit further comprise:
Increase the bit number that the MCS information occupies, is used to indicate the MCS information reported in the support 256QAM tune MCS index in the MCS table of system；Alternatively,
The UE receives the deviant that base station is sent, and the MCS table modulated according to the deviant in the support 256QAM It is middle to extract the part MCS MCS table actually used when constituting the processing MCS information.
35. according to the subscriber terminal equipment UE any in claim 31 to 34, which is characterized in that the downlink data connects It receives and processing unit further comprises: after receiving the down dispatch information, the down dispatch information being indicated The RE mapping of PDSCH and QCL configure corresponding MCS table, as the MCS table used when handling the MCS information；Wherein, It is that base station is preconfigured that each RE mapping of PDSCH and QCL, which configure corresponding MCS table,.
36. according to the subscriber terminal equipment UE any in claim 31 to 34, which is characterized in that the lower line number Further comprise with processing unit according to receiving: after receiving the down dispatch information, according to UE detection for carrying institute (E) PDCCH for stating down dispatch information is to determine the MCS table used when handling the MCS information positioned at USS or CSS.
37. according to the subscriber terminal equipment UE any in claim 31 to 34, which is characterized in that the downlink data connects It receives and processing unit further comprises: after receiving the down dispatch information, will be used to carry the down dispatch information (E) PDCCH the corresponding MCS table of aggregation level, as the MCS table that uses when handling the MCS information.
38. according to the subscriber terminal equipment UE any in claim 31 to 34, which is characterized in that the downlink data connects Receive and processing unit according to the type of (E) PDCCH be it is local or distributed, used when determining the processing MCS information MCS table.
39. according to the subscriber terminal equipment UE any in claim 31 to 34, which is characterized in that the descending scheduling letter Breath receiving unit further comprises: after receiving the down dispatch information, will be used to carry the down dispatch information The corresponding MCS table of EPDCCH collection where EPDCCH, as the MCS table used when handling the MCS information；Wherein, institute Stating each EPDCCH of UE, to integrate corresponding MCS table preconfigured as base station.
40. according to the subscriber terminal equipment UE any in claim 31 to 34, which is characterized in that the descending scheduling letter Breath receiving unit further comprises: downlink subframe is divided into multiple set, and to each downlink subframe set, configuration schedules its The MCS table that the DCI of downlink data transmission is used；
The downlink data receives and processing unit further comprises: after receiving the down dispatch information, by the DCI The MCS table that information uses, the MCS table used as the processing MCS information.
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KR1020217008122A KR102347644B1 (en) 2013-09-03 2014-03-18 Downlink transmission method and user terminal equipment
US14/916,399 US10257841B2 (en) 2013-09-03 2014-03-18 Downlink transmission method and user terminal equipment
PCT/KR2014/002289 WO2015034151A1 (en) 2013-09-03 2014-03-18 Downlink transmission method and user terminal equipment
EP14841653.0A EP3042520B1 (en) 2013-09-03 2014-03-18 A method for the measurement and reporting of channel quality, modulation and channel coding information, and corresponding apparatus
JP2016540784A JP6531102B2 (en) 2013-09-03 2014-03-18 Downlink transmission method and user terminal device
KR1020167005022A KR20160051758A (en) 2013-09-03 2014-03-18 Downlink transmission method and user terminal equipment
US16/031,317 US10455594B2 (en) 2013-09-03 2018-07-10 Downlink transmission method and user terminal equipment
US16/263,793 US10448413B2 (en) 2013-09-03 2019-01-31 Downlink transmission method and user terminal equipment
US16/561,498 US10609717B2 (en) 2013-09-03 2019-09-05 Downlink transmission method and user terminal equipment
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