CN101686214A - Method and device for performing channel quality indicator estimation - Google Patents
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Abstract
The invention discloses a method for performing channel quality indicator (CQI) estimation, which is applied to a multi-input multi-output system. The method comprises the following steps: according to a received sounding reference signal transmitted by a user terminal, performing uplink channel estimation; according to an uplink channel estimation result, scheduling the user terminal, and allocating physical resources to be occupied in next transmission to the user terminal; and according to the uplink channel information of each physical resource, performing the CQI estimation to obtain a CQI. At the same time, the invention also discloses a device for performing the CQI estimation in the multi-input multi-output system. The method and the device can estimate the CQI of any sub-band because the sounding reference signal transmitted by the user terminal can cover the whole bandwidth, estimate the CQI before a user transmits data because the sounding reference signal can be independentof the data transmitted by the user terminal, and obtain the more accurate CQI because the CQI estimation is performed according to the uplink channel information corresponding to the physical resources allocated to the user terminal for the next transmission.
Description
Technical field
The present invention relates to communication technical field, (Multiple InputMultiple Output carries out channel quality indication (Channel Quality Indicator, CQI) estimation approach and device in MIMO) to particularly a kind of multiple-input and multiple-output.
Background technology
The transmission diversity technique of mimo system is the data flow after transmitting terminal repeats to send the process precoding, thereby obtains diversity gain and coding gain; The space multiplexing technique of mimo system is to send several different data flow at transmitting terminal, thereby under the situation that does not increase bandwidth, improve capability of communication system and spectrum efficiency exponentially, really embodied the essence that the mimo system capacity improves, but it requires channel to be become the several separate parallel sub-channels by equivalence, thereby can not produce interference between data flow.
In uplink, in order to reach higher peak rate, original user terminal (UE) single antenna transmissions, (Single Input Multiple Output SIMO), can not satisfy the requirement of future communications development to the many outputs of promptly single input.Therefore, the Uplink MIMO technology is a kind of inevitable development, also is Long Term Evolution (Long-Term-Evolution, LTE) essential step that strides forward to advanced person's Long Term Evolution (LTE-Advanced).In the Uplink MIMO technology, it is a very important part that CQI estimates.Decide the modulation coding mode of UE side emission by the CQI estimated value of base station side, thereby reach the lower error rate and the transmission rate of Geng Gao.Therefore, the accuracy of CQI algorithm for estimating is most important, has greatly influenced the throughput size of system.
(Single-user Multiple Input Multiple Output SU-MIMO) has two kinds of patterns of closed loop and open loop to the uplink single user multiple-input and multiple-output at present.Open loop SU-MIMO pattern does not need the feedback of channel information, comprises up transmission diversity, technology such as up Open-Loop Spatial Multiplexing.Closed loop SU-MIMO pattern has made full use of the feedback of channel information, adjusts pre-coding matrix according to the channel information self adaptation, thereby obtains bigger power system capacity.Present technology of closed loop mainly contains two kinds of code book (Codebook) and non-code books (Non-codebook).Wherein the former pre-coding matrix is selected in a code book according to channel information, and the latter's pre-coding matrix does not have code book but obtains by the SVD decomposition according to the up-downgoing channel symmetry.No matter adopt open loop and technology of closed loop, (Modulationand coding Scheme MCS) adjusts all will to carry out CQI estimation and modulation coding mode.
And also not having the open SU-MIMO system of scheme to carry out the CQI estimation approach at present, the someone proposes to utilize demodulation pilot frequency to estimate that the channel information that obtains carries out CQI and estimates.In this scheme, the base station is carried out CQI by the estimated result that utilizes demodulation pilot frequency and is estimated, because demodulation pilot frequency is to be sent together when base station side sends data by UE, therefore, this scheme only sends under the data conditions and could realize at UE, simultaneously owing to being to transmit the CQI that used physical resource obtains last time, such as some (Physical ResourceBlock, PRB) the subband CQI of Physical Resource Block correspondence at UE.If the base station is adjusted the used physical resource of UE, to other subbands, then adopt the demodulation CQI estimated result of last time to have very big error from certain sub-band transforms, because the different actual CQI of the channel conditions of different physical resources are also different.This moment, selected MCS just had very large deviation, caused the decline of throughput of system.
Therefore, how obtaining as far as possible CQI estimated value accurately, is to need the problem that solves in the SU-MIMO system.
Summary of the invention
The purpose of this invention is to provide a kind of CQI of carrying out estimation approach and device, be used for realizing that at multi-input multi-output system CQI estimates.
A kind of CQI estimation approach of carrying out provided by the invention is applied in the multi-input multi-output system, and this method comprises:
Detection reference signal according to receiving that user terminal sends carries out uplink channel estimation;
According to the uplink channel estimation result this user terminal is dispatched,, and carried out CQI according to the uplink channel information of each physical resource and estimate, obtain CQI for this user terminal distributes the shared physical resource of transmission next time.
The embodiment of the invention provides a kind of device that CQI estimates that carries out in multi-input multi-output system, this device comprises:
Channel estimating unit is used for carrying out uplink channel estimation according to the detection reference signal of receiving that user terminal sends;
The scheduling of resource unit is used for according to the uplink channel estimation result described user terminal being dispatched, for described user terminal distributes the shared physical resource of transmission next time;
Channel quality estimation unit is used for carrying out CQI according to the uplink channel information of each physical resource that distributes for described user terminal and estimates.
The embodiment of the invention is the detection reference signal that utilizes user terminal to send, and carries out uplink channel estimation; According to the uplink channel estimation result described user terminal is dispatched, for described user terminal distributes the shared physical resource of transmission next time; Carrying out CQI according to the uplink channel information of each physical resource that distributes for described user terminal estimates.
In embodiments of the present invention, because the detection reference signal that user terminal sends can cover whole bandwidth, therefore can estimate the CQI of arbitrary subband.
And, in embodiments of the present invention, realize that CQI estimates owing to adopt detection reference signal, and the detection reference signal that user terminal sends can be independent of the data that user terminal sends, therefore, the embodiment of the invention just can be estimated to obtain CQI, and then can provide CQI for user terminal begins to transmit data before user terminal transmission data.
Because the embodiment of the invention is to carry out CQI according to the pairing uplink channel information of physical resource of being distributed for the next transmission of user terminal to estimate, therefore can obtain CQI more accurately.
Description of drawings
Fig. 1 is the schematic flow sheet of embodiment of the invention method;
Fig. 2 is the structural representation of embodiment of the invention device;
Fig. 3 carries out CQI for the embodiment of the invention and estimates and the desirable CQI estimation performance contrast schematic diagram that does not have time-delay.
Embodiment
The embodiment of the invention is in mimo system, and detection (Sounding) reference signal of utilizing user terminal to send is carried out uplink channel estimation; According to the uplink channel estimation result described user terminal is dispatched, for described user terminal distributes the shared physical resource of transmission next time; Carrying out CQI according to the uplink channel information of each physical resource that distributes for described user terminal estimates.Afterwards, can be by the CQI of setting and the corresponding relation of MCS grade, the MCS grade of definite CQI corresponding user terminal that is obtained.
Here, described sounding reference signal can be that described user terminal sends to base station side at set intervals.And user terminal can take whole bandwidth or the part bandwidth sends the sounding reference signal to base station side.
Below in conjunction with accompanying drawing 1, be embodiment with the SU-MIMO system, the specific implementation of the inventive method is described.
Referring to shown in Figure 1, the embodiment of the invention realizes that in the SU-MIMO system idiographic flow of estimating is as follows:
Step 101: user terminal sends the sounding reference signal in whole bandwidth or part bandwidth to the base station at set intervals, such as: user terminal 5ms sends a sounding reference signal to the base station.
Step 102: base station side is carried out uplink channel estimation by the described sounding reference signal of receiving, and according to the uplink channel estimation result this user terminal is dispatched, to determine the shared physical resource of this user terminal transmission next time;
Step 103: base station side is carried out CQI according to the uplink channel information of each physical resource of determining and is estimated.
In embodiments of the present invention, for different up SU-MIMO algorithms, the CQI method of estimation is slightly different:
First kind of situation: for open loop SU-MIMO, the base station directly obtains CQI according to the uplink channel information of distributing physical resource for this user terminal by the EESM mapping.
Second kind of situation: for the closed loop SU-MIMO of code book form, the base station is according to the certain criterion of uplink channel information foundation of the physical resource that distributes for this user terminal, from the code book that is provided with, select pre-coding matrix to obtain precoding index (PMI), and utilize the pre-coding matrix of channel information and this PMI correspondence to carry out the EESM mapping to obtain CQI.
The third situation: for the closed loop SU-MIMO of non-code book form, the base station is according to the uplink channel information of the physical resource that distributes for this user terminal, singular value decomposition (SingularValue Decomposition by the up channel matrix, SVD) decomposition obtains pre-coding matrix, and (Exponential Effective SIR Mapping, EESM) mapping obtains CQI to utilize channel information and pre-coding matrix to carry out the effective wanted to interfering signal ratio mapping of index.
Step 104: base station side is by the CQI that is provided with and the corresponding relation of MCS, determines the MCS information of the CQI corresponding user terminal that obtained, such as: MCS grade or or the sign of indication present encoding mode etc.
Afterwards, base station side can be passed through this MCS information of down channel informing user terminal, and with the MCS information informing user terminal of determining, user terminal can carry out corresponding modulating-coding to the upstream data that will be transferred to the base station according to this MCS information by the control signaling.
Referring to shown in Figure 2, the device that carries out the CQI estimation in multi-input multi-output system of the embodiment of the invention comprises: channel estimating unit 201, scheduling of resource unit 202 and channel quality estimation unit 203.Wherein,
Channel estimating unit 201 is used for carrying out uplink channel estimation according to the sounding reference signal of receiving that user terminal sends;
Scheduling of resource unit 202 is used for according to the uplink channel estimation result described user terminal being dispatched, for described user terminal distributes the shared physical resource of transmission next time;
Channel quality estimation unit 203 is used for carrying out CQI according to the uplink channel information of each physical resource that distributes for described user terminal and estimates.
This device can further include: the MCS selected cell is used for determining the MCS information of the estimated CQI corresponding user terminal that obtains by the CQI of setting and the corresponding relation of MCS, and notifies described user terminal with this MCS information.
When described multi-input multi-output system is when adopting the system of the single user's multiple-input and multiple-output of open loop SU-MIMO pattern, described channel quality estimation unit 203 can obtain CQI by the EESM mapping according to the uplink channel information of distributing physical resource for this user terminal.
When described multi-input multi-output system during for the system of closed loop SU-MIMO pattern of adopting the code book form, described channel quality estimation unit, can be according to the uplink channel information of the physical resource that distributes for this user terminal, from code book, select pre-coding matrix to obtain PMI, and utilize the pre-coding matrix of described uplink channel information and this PMI correspondence to carry out the EESM mapping to obtain CQI.
When described multi-input multi-output system during for the system of closed loop SU-MIMO pattern of adopting non-code book form, described channel quality estimation unit, can be according to the uplink channel information of the physical resource that distributes for this user terminal, SVD decomposition by described uplink channel information channel matrix obtains pre-coding matrix, and utilizes channel information and pre-coding matrix to carry out EESM mapping acquisition CQI.
Fig. 3 carries out CQI for the embodiment of the invention and estimates and the desirable CQI estimation performance contrast schematic diagram that does not have time-delay.Referring to shown in Figure 3, use the embodiment of the invention, emulation under the 2x2 antenna array TU channel, the CQI estimated performance of CQI method of estimation of the present invention and desirable no time delay contrasts.As can be seen from Figure 3, under non-code book situation, CQI method of the present invention is very little compared with the CQI estimated result performance loss that ideal does not have time delay; Under the code book situation, adopt CQI of the present invention and the performance loss of PMI method of estimation also very little.
Need to prove that the embodiment of the invention has extensive applicability, be not only applicable to the SU-MIMO under 2 * 2, can also be used for any aerial array (such as the polarization battle array), the transfer of data under any MIMO antenna configurations.The CQI that the present invention simultaneously can also be used for various Uplink MIMO sending modes estimates, is not limited to several modes listed among the present invention.
In embodiments of the present invention, base station side is a Sounding reference signal of utilizing user terminal to send, carry out uplink channel estimation, and described user terminal is dispatched according to the uplink channel estimation result, for described user terminal distributes the shared physical resource of transmission next time, carry out CQI according to the uplink channel information of each physical resource that distributes for described user terminal and estimate.
In the embodiment of the invention,, therefore can estimate the CQI of arbitrary subband because the Sounding reference signal that user terminal sends can cover whole bandwidth.And, the embodiment of the invention is because the Sounding reference signal can be independent of the data that user terminal sends, and therefore, the embodiment of the invention is before the user is transmitted data, also can estimate to obtain CQI and estimate size, and then can provide CQI for user terminal begins to transmit data.Because the embodiment of the invention is to estimate according to the pairing uplink channel information of physical resource of being distributed for the next transmission of user terminal, therefore can obtain CQI more accurately, reduces the MCS Select Error.In embodiments of the present invention, can also reduce the sounding reference signal and send at interval, can reduce the CQI error that time delay is brought like this.Simultaneously, because in embodiments of the present invention, can therefore have very big flexibility according to the CQI algorithm for estimating of the selection correspondence of different SU-MIMO mode adaptives.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (12)
1, a kind of channel quality indicator (CQI) estimation approach of carrying out is applied to it is characterized in that in the multi-input multi-output system that this method may further comprise the steps:
Detection reference signal according to receiving that user terminal sends carries out uplink channel estimation;
According to the uplink channel estimation result this user terminal is dispatched,, and carried out CQI according to the uplink channel information of each physical resource and estimate, obtain CQI for this user terminal distributes the shared physical resource of transmission next time.
2, method according to claim 1 is characterized in that, after obtaining CQI, this method further comprises:
By the CQI of setting and the corresponding relation of modulation coding mode MCS, determine the MCS information of the estimated CQI corresponding user terminal that obtains, and notify described user terminal this MCS information.
3, method according to claim 1, it is characterized in that, when described multi-input multi-output system is that described uplink channel information according to each physical resource is carried out the CQI estimation, comprising when adopting the system of the single user's multiple-input and multiple-output of open loop SU-MIMO pattern:
Obtain CQI according to the uplink channel information of distributing physical resource for this user terminal by the effective wanted to interfering signal ratio mapping of index EESM mapping.
4, method according to claim 1 is characterized in that, when described multi-input multi-output system during for the system of closed loop SU-MIMO pattern of adopting the code book form, described uplink channel information according to each physical resource is carried out CQI and estimated, comprising:
According to the uplink channel information of the physical resource that distributes for this user terminal, from code book, select pre-coding matrix to obtain precoding index PMI, and utilize the pre-coding matrix of described uplink channel information and this PMI correspondence to carry out the EESM mapping to obtain CQI.
5, method according to claim 1 is characterized in that, when described multi-input multi-output system during for the system of closed loop SU-MIMO pattern of adopting non-code book form, described uplink channel information according to each physical resource is carried out CQI and estimated, comprising:
The base station is according to the uplink channel information of the physical resource that distributes for this user terminal, and the singular value decomposition SVD by described uplink channel information channel matrix obtains pre-coding matrix, and utilizes channel information and pre-coding matrix to carry out EESM mapping acquisition CQI.
6, method according to claim 1 is characterized in that, described detection reference signal is that described user terminal sends to base station side at set intervals.
7, method according to claim 1 is characterized in that, described detection reference signal is that user terminal takies whole bandwidth or the part bandwidth sends to base station side.
8, a kind of device that carries out the CQI estimation in multi-input multi-output system is characterized in that this device comprises:
Channel estimating unit is used for carrying out uplink channel estimation according to the detection reference signal of receiving that user terminal sends;
The scheduling of resource unit is used for according to the uplink channel estimation result described user terminal being dispatched, for described user terminal distributes the shared physical resource of transmission next time;
Channel quality estimation unit is used for carrying out CQI according to the uplink channel information of each physical resource that distributes for described user terminal and estimates.
9, device according to claim 8 is characterized in that, when described multi-input multi-output system is the system of the single user's multiple-input and multiple-output of employing open loop SU-MIMO pattern,
Described channel quality estimation unit is used for obtaining CQI according to the uplink channel information of distributing physical resource for this user terminal by the EESM mapping.
10, device according to claim 8 is characterized in that, when described multi-input multi-output system during for the system of closed loop SU-MIMO pattern of adopting the code book form,
Described channel quality estimation unit, be used for uplink channel information according to the physical resource that distributes for this user terminal, from the code book that is provided with, select pre-coding matrix to obtain precoding index PMI, and utilize the pre-coding matrix of described uplink channel information and this PMI correspondence to carry out the EESM mapping to obtain CQI.
11, device according to claim 8 is characterized in that, when described multi-input multi-output system during for the system of closed loop SU-MIMO pattern of adopting non-code book form,
Described channel quality estimation unit, be used for uplink channel information according to the physical resource that distributes for this user terminal, SVD decomposition by described uplink channel information channel matrix obtains pre-coding matrix, and utilizes channel information and pre-coding matrix to carry out EESM mapping acquisition CQI.
12, device according to claim 8 is characterized in that, this device further comprises:
The MCS selected cell is used for determining the MCS information of the estimated CQI corresponding user terminal that obtains by the CQI of setting and the corresponding relation of MCS, and notifies described user terminal with this MCS information.
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| CN102291839A (en) * | 2011-08-16 | 2011-12-21 | 电信科学技术研究院 | Method and device for transmitting CQI (channel quality indicator) information |
| CN102437899A (en) * | 2011-12-19 | 2012-05-02 | 电信科学技术研究院 | Method and device for determining uplink CQI (Channel Quality Indicator) value |
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| CN103503324A (en) * | 2011-01-07 | 2014-01-08 | 英特尔公司 | Cqi definition for transmission mode 9 in LTE-advanced |
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