CN103944686A - CSI feedback method and device of multiple user MIMO system - Google Patents
CSI feedback method and device of multiple user MIMO system Download PDFInfo
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Abstract
The invention relates to a multi-user MIMO transmission technology. In one embodiment, a channel state information feedback method used for a multiple input multiple output system is provided. The channel state information feedback method includes the steps that a first measurement resource set and a second measurement resource set which are used for channel state information of a set of user equipment are determined; silence is kept on interference measurement resources in the first measurement resource set, and signals are sent on interference measurement resources in the second measurement resource set; single user channel state information of the user equipment is determined according to feedback related to the first measurement resource set, and multiple user channel state information of the user equipment is determined according to feedback related to the second measurement resource set.
Description
Technical field
The present invention relates generally to mobile communication technology, more specifically, relates to multi-user's multiple-input and multiple-output (MultipleUser Multiple Input Multiple Output, MU MIMO) transmission technology.
Background technology
Such as Long Term Evolution project (Long Term Evolution, LTE) in Modern Mobile Communications Systems, base station is down link (downlink, DL) and up link (uplink, UL) determine the transformat, transmission block size, modulation and coding scheme, MIMO transmission mode etc. that use.In order to carry out such determining for down link, base station need to be from subscriber equipment (User Equipment, the information of the performance about current downlink channel UE), be commonly called channel condition information (Channel State Information, CSI).
The tenth edition publishing standard of LTE (LTE Release10) and before technical standard in, because existing CSI feedback model is suitable for alone family multiple-input and multiple-output (SU MIMO) pattern, multiuser MIMO pattern does not observe the significant performance gain than Single User MIMO pattern.
Summary of the invention
A main purpose of the present invention is the technical scheme of the feedback of the CSI for MU-MIMO system that provides new and can overcomes above-mentioned defect of the prior art.
According to one embodiment of present invention, provide a kind of method of the information feedback for multi-input multi-output system, having comprised: the first measurement resource collection and second that is identified for the channel condition information of a subscriber equipment has been measured resource collection; In the described first interferometry resource of measuring in resource collection, mourn in silence, transmitted signal in the described second interferometry resource of measuring in resource collection; According to the alone family channel condition information of determining described subscriber equipment about the described first feedback of measuring resource collection, according to the multiuser channel state information of determining described subscriber equipment about the described second feedback of measuring resource collection.
By said method, can be that a subscriber equipment is determined the CSI under CSI and the multi-user mode under single user mode.Comprehensive multiple subscriber equipment alone family CSI and multi-user CSI separately, compares and selects based on overall performance Optimality Criteria, can determine corresponding Single User MIMO transmission mode or multi-user MIMO transmissions pattern for each subscriber equipment.
In a specific embodiment of the method, also comprise: send message to indicate described first to measure resource collection and the second measurement resource collection to described subscriber equipment.
In a specific embodiment of the method, the pre-coding matrix of the signal sending in the described second zero energy channel state information reference signals resource of measuring in resource collection is mutually orthogonal with the pre-coding matrix that is carried on the data-signal on identical physical resources piece.
In a specific embodiment of the method, also comprise: send message to indicate described subscriber equipment to carry out the described feedback about described the first measurement resource collection and the described feedback about described the second measurement resource collection with differential mode.More specifically, described differential mode comprises: feedback, about the actual value of the CQI of a data flow of described the first measurement resource collection, is fed back at least one difference with respect to this actual value in other CQI.
In a specific embodiment of the method, describedly measure the feedback of resource collection and describedly measure the feedback of resource collection about described second and adopt identical feedback model about described first.
In a specific embodiment of the method, measure resource collection and second to described first and measure resource collection the restriction of different sum of ranks codebook subsets is set.
According to another embodiment of the invention, a kind of device of the base station equipment for multi-input multi-output system is provided, comprise: the first module, its first measurement resource collection and second that is configured to the channel condition information that is identified for a subscriber equipment is measured resource collection; The second module, it is configured to mourn in silence in the described first interferometry resource of measuring in resource collection, transmitted signal in the described second interferometry resource of measuring in resource collection; The 3rd module, it is configured to according to the alone family channel condition information of determining described subscriber equipment about the described first feedback of measuring resource collection, according to the multiuser channel state information of determining described subscriber equipment about the described second feedback of measuring resource collection.
In a specific embodiment of this device, described the second module is also configured to send message to indicate described first to measure resource collection and the second measurement resource collection to described subscriber equipment.
In a specific embodiment of this device, the pre-coding matrix of the signal sending in the described second zero energy channel state information reference signals resource of measuring in resource collection is mutually orthogonal with the pre-coding matrix that is carried on the data-signal on identical physical resources piece.
In a specific embodiment of this device, described the second module is also configured to send message to indicate described subscriber equipment to carry out the described feedback about described the first measurement resource collection and the described feedback about described the second measurement resource collection with differential mode.More specifically, described differential mode comprises: feedback, about the actual value of the CQI of a data flow of described the first measurement resource collection, is fed back at least one difference with respect to this actual value in other CQI.
In a specific embodiment of this device, describedly measure the feedback of resource collection and describedly measure the feedback of resource collection about described second and adopt identical feedback model about described first.
In a specific embodiment of this device, in described the first module, measure resource collection and second to described first and measure resource collection the restriction of different sum of ranks codebook subsets is set.
According to still a further embodiment, provide a kind of base station equipment for multi-input multi-output system, it comprises aforementioned means.
According to still another embodiment of the invention, provide a kind of method of the information feedback for multi-input multi-output system, having comprised: detected first and measure resource collection and the second measurement resource collection; Carry out about described first and measure the information feedback of resource collection and the information feedback about described the second measurement resource collection with differential mode.More specifically, described differential mode comprises: feedback, about the actual value of the CQI of a data flow of described the first measurement resource collection, is fed back at least one difference with respect to this actual value in other CQI.
In a specific embodiment of the method, describedly measure the feedback of resource collection and describedly measure the feedback of resource collection about described second and adopt identical feedback model about described first.
According to another preferred embodiment, provide a kind of device of the subscriber equipment for multi-input multi-output system, having comprised: detection module, it is configured to detect the first measurement resource collection and second and measures resource collection; Feedback module, it is configured to carry out about described first and measure the information feedback of resource collection and the information feedback about described the second measurement resource collection with differential mode.More specifically, described differential mode comprises: feedback, about the actual value of the CQI of a data flow of described the first measurement resource collection, is fed back at least one difference with respect to this actual value in other CQI.
In a specific embodiment of this device, describedly measure the feedback of resource collection and describedly measure the feedback of resource collection about described second and adopt identical feedback model about described first.
According to another preferred embodiment, provide a kind of subscriber equipment for multi-input multi-output system, it comprises aforementioned means.
Technical characterictic of the present invention and advantage are more than summarized to make the detailed description below the present invention be easier to understand.Other features and advantages of the present invention will be described below, and it has formed the theme of claim of the present invention.Those skilled in the art will be understood that disclosed concept and embodiment can easily be used as amendment or design other for realizing the basis of structure or flow process of the object identical with the present invention.Those skilled in the art should also be understood that such equivalent constructions does not deviate from the spirit and scope of appended claims.
Brief description of the drawings
By reference to the accompanying drawings, below, will be easier to understand about the detailed description of the preferred embodiments of the present invention.The present invention is explained by way of example, is not limited to accompanying drawing, and in accompanying drawing, similarly Reference numeral is indicated similar element.
Fig. 1 shows application scenarios schematic diagram according to an embodiment of the invention;
Fig. 2 shows the flow chart of CSI feedback method according to an embodiment of the invention;
Fig. 3 shows the structured flowchart that is disposed at the device 10 of base station equipment and is disposed at the device 20 of subscriber equipment according to an embodiment of the invention.
Embodiment
The detailed description of accompanying drawing is intended to the explanation as currently preferred embodiment of the present invention, but not is intended to represent that the present invention can be achieved only form.It should be understood that function identical or that be equal to can be completed by the different embodiment that are intended to be contained within the spirit and scope of the present invention.
Those skilled in the art will be understood that means described herein and function can be with realizing in conjunction with the software function of program control microprocessor and all-purpose computer, and/or use ASIC(Application Specific Integrated Circuit) (ASIC) to realize.What will also be understood that is, although the present invention mainly describes with the form of method and apparatus, the present invention also can be embodied as computer program and comprise computer processor and be connected to the system of memory of processor, and wherein memory is encoded by one or more programs that can complete the function disclosing herein.
Fig. 1 shows application scenarios schematic diagram according to an embodiment of the invention.Technical scheme of the present invention is suitable for multi-input multi-output system.As shown in the figure, this scene comprises base station equipment 1 and subscriber equipment 2.Technical scheme of the present invention is suitable for, such as but not limited to, the CSI feedback between base station equipment 1 and subscriber equipment 2.Those skilled in the art will be understood that, alleged base station or base station equipment are such as but not limited to the Node B in LTE system or LTE-A system (Node B) or evolution Node B (evolved Node B herein, eNB), technical scheme of the present invention is also not limited to be suitable for LTE system or LTE-A system.
Fig. 2 shows the flow chart of the CSI feedback method that is suitable for mimo system according to an embodiment of the invention.As shown in the figure, the method 200 comprises the step 211 performed by base station equipment 1,213,215 and 217, and by the performed step 222 of subscriber equipment 2 and 224.As is known, in LTE-A series standard specification, defined channel condition information process (CSI process), eNB is that UE distributes the detection of CSI process for CSI.CSIprocess comprises non-zero power channel state information reference signals (NZP CSI RS) resource and zero energy channel state information reference signals (ZP CSI RS) resource, and zero energy channel state information reference signals (ZP CSI RS) resource further can comprise interferometry (IM) resource.
In step 211, base station equipment 1 is identified for the first measurement resource collection and the second measurement resource collection of the channel condition information of subscriber equipment 2.Those skilled in the art will be understood that in the time being applicable to different consensus standards, and " measurement resource collection " here can correspond respectively to corresponding definition or the term in different protocol standards.In the time being applicable to LTE-A system, " measurement resource collection " is corresponding to " CSI process ".First measures resource collection and second measures a namely CSI process and the 2nd CSI process of resource collection.Conventionally, in these two CSI process, all comprise NZPCSI RS resource and IM resource.First measures resource collection (a CSI process) detects for the alone family CSI of subscriber equipment 2, conventionally there is no the restriction of order and code book.And the second measurement resource collection (the 2nd CSI process) detects for the multi-user CSI of subscriber equipment 2, conventionally order can be restricted to 1, code book limits corresponding to order.
In step 213, base station equipment 1 sends message to indicate described first to measure resource collection and the second measurement resource collection to subscriber equipment 2, that is the first and second CSI process.
In step 215, in the interferometry resource of base station equipment 1 in the first measurement resource collection, mourn in silence (not signaling, keep zero energy), and transmitted signal in interferometry resource in the second measurement resource collection.
More specifically, the signal sending in the interferometry resource in the second measurement resource collection can be the multi-user interference signal of simulation, data-signal and/or control signal that even also can other subscriber equipmenies.For example, base station equipment 1 can send random signal in the interferometry resource in the second measurement resource collection, and be the pre-coding matrix selected of this random signal and be carried on same Physical Resource Block (Physical Resource Block, the pre-coding matrix of the data-signal PRB) is mutually orthogonal, simulates multi-user interference with this.Subscriber equipment 2 detects the channel condition information that can obtain being suitable for multi-user mode to the second measurement resource collection.Further, by the selection to sending modes such as pre-coding matrixes and control, random simulation multi-user interference signal replacing can also be become to the True Data signal of other subscriber equipmenies outside subscriber equipment 2, can not only realize the CSI detection that is suitable for multi-user mode, also can utilize interferometry resource to transmit data, thereby improve the utilance of Radio Resource.
In step 222, subscriber equipment 2 detects the first measurement resource collection and second and measures resource collection.Conventionally, subscriber equipment 2 is without learning the first measurement resource collection and the second difference of measurement resource collection in the time sending, and it is measured resource collection to the first measurement resource collection and second in an identical manner and detects.
In step 224, subscriber equipment 2 feeds back about the channel condition information of the first measurement resource collection and about the channel condition information of the second measurement resource collection to base station equipment 1.Institute's feedack is such as but not limited to comprising at least one in the following: channel quality instruction (CQI), pre-coding matrix index (PMI), transmission rank of matrix (rank).
In step 217, base station equipment 1 is according to the alone family channel condition information of determining subscriber equipment 2 about the feedback of the first measurement resource collection, according to the multiuser channel state information of determining subscriber equipment 2 about the feedback of the second measurement resource collection.Afterwards, the comprehensive multiple subscriber equipmenies of base station equipment 1 alone family CSI and multi-user CSI separately, compare and select based on overall performance Optimality Criteria, can determine corresponding Single User MIMO transmission mode or multi-user MIMO transmissions pattern for each subscriber equipment.
One at said method changes in example, also comprises the step performed by base station equipment 1: send message and carry out described feedback and the described feedback about the second measurement resource collection about the first measurement resource collection with equipment for indicating user 2 with differential mode., in step 224, subscriber equipment 2 is carried out about the CSI feedback of the first measurement resource collection and feeds back about the CSI of the second measurement resource collection with differential mode.A CSI process can be considered the process with reference to CSI, and the 2nd CSI process can be considered subordinate CSI process.Particularly, subscriber equipment 2 comprises the CQI of a data flow or multiple data flow to the feedback of a CSI process, the feedback of the 2nd CSI process is also comprised to the CQI of this data flow or multiple data flow.The CQI feedback of one of them data flow to a CSI process adopts actual value, and using this CQI actual value as fiducial value, other CQI all feeds back the difference with respect to this fiducial value.Due to the CQI of a data flow about a CSI process or multiple data flow and are all channel qualities that same subscriber equipment detects about this data flow of the 2nd CSI process or the CQI of multiple data flow, the dynamic range of the difference between other each CQI and fiducial value is less than the dynamic range of fiducial value conventionally, therefore can adopt the quantization bit more less than fiducial value to difference.For example, CQI fiducial value adopts 4 bit quantization codings, and the difference of other CQI feedback can adopt 1-3 bit quantization coding.The feedback of therefore, carrying out the first and second measurement resource collections with differential mode can be saved feedback overhead.
In a specific embodiment of said method, measure the feedback of resource collection and adopt identical feedback model about the described second feedback of measuring resource collection about described first.Particularly, a CSI process and the 2nd CSIprocess adopt identical band width configuration, subpattern configuration, antenna configuration etc.
In a specific embodiment of said method, base station equipment 1 is measured resource collection and second to described first and is measured resource collection the restriction of different sum of ranks codebook subsets is set in step 211.Particularly, first measures the CSI feedback of resource collection for single user mode, can not limit sum of ranks codebook subset; Second measures the CSI feedback of resource collection for multi-user mode, order can be restricted to 1 and codebook subset is done to respective limits.Correspondingly, base station equipment 1 also will send the restriction about the sum of ranks codebook subset of the first measurement resource collection and the second measurement resource collection with equipment for indicating user 2 of message or signaling.
Fig. 3 shows the structured flowchart of device 10 according to an embodiment of the invention and device 20.In device 10 base station equipments that are conventionally disposed at such as but not limited to base station equipment 1.In device 20 subscriber equipmenies that are conventionally disposed at such as but not limited to subscriber equipment 2.As shown in the figure, device 10 comprises the first module 11, the second module 12, the 3rd module 13 and receiver module 14; Device 20 comprises detection module 21 and feedback module 22.
The first module 11 is configured to the first measurement resource collection and second of the channel condition information that is identified for a subscriber equipment and measures resource collection, corresponding to the step 211 of carrying out in preceding method 200.
The second module 12 is configured to mourn in silence in the described first interferometry resource of measuring in resource collection, and transmitted signal in the described second interferometry resource of measuring in resource collection, corresponding to the step 215 of carrying out in preceding method 200.As a sending module, the second module 12 can also be configured to carry out the step 213 in preceding method 200.
The 3rd module 13 is configured to according to the alone family channel condition information of determining described subscriber equipment about the described first feedback of measuring resource collection, according to the multiuser channel state information of determining described subscriber equipment about the described second feedback of measuring resource collection, corresponding to the step 217 of carrying out in preceding method 200.
Receiver module 14 is configured to receive signal, for example, from the feedback signal of subscriber equipment 2.
Detection module 21 is configured to detect the first measurement resource collection and second and measures resource collection, corresponding to the step 222 of carrying out in preceding method 200.
Feedback module 22 is configured to base station equipment feedback about the channel condition information of the first measurement resource collection and about the channel condition information of the second measurement resource collection, corresponding to the step 224 of carrying out in preceding method 200.Feedback module 22 can be configured to carry out about described first and measure the information feedback of resource collection and the information feedback about described the second measurement resource collection with differential mode.
Those skilled in the art will be understood that the function of above-mentioned arbitrary module can be divided by multiple entity module or functional module and carry out, and the function of above-mentioned multiple modules also can be integrated in an entity module or functional module is carried out.
Although illustrated and described different embodiments of the invention, the present invention is not limited to these embodiment.The ordinal number such as " first ", " second " occurring in claim only plays the effect of difference, and and does not mean that and between corresponding component, have any specific order or annexation.The technical characterictic only occurring in some claim or embodiment also and do not mean that and can not combine to realize with other features in other claims or embodiment useful new technical scheme.In the situation that not deviating from as the described the spirit and scope of the present invention of claims, many amendments, change, distortion, to substitute and be equal to be obvious to those skilled in the art.
Claims (22)
1. for a method for the information feedback of multi-input multi-output system, comprising:
The the first measurement resource collection and second that is identified for the channel condition information of a subscriber equipment is measured resource collection;
In the described first interferometry resource of measuring in resource collection, mourn in silence, transmitted signal in the described second interferometry resource of measuring in resource collection;
According to the alone family channel condition information of determining described subscriber equipment about the described first feedback of measuring resource collection, according to the multiuser channel state information of determining described subscriber equipment about the described second feedback of measuring resource collection.
2. the method for claim 1, is characterized in that, also comprises:
Send message to indicate described first to measure resource collection and the second measurement resource collection to described subscriber equipment.
3. the method for claim 1, it is characterized in that, the pre-coding matrix of the signal sending in the described second zero energy channel state information reference signals resource of measuring in resource collection is mutually orthogonal with the pre-coding matrix that is carried on the data-signal on identical physical resources piece.
4. the method for claim 1, is characterized in that, also comprises:
Send message to indicate described subscriber equipment to carry out the described feedback about described the first measurement resource collection and the described feedback about described the second measurement resource collection with differential mode.
5. method as claimed in claim 4, is characterized in that, described differential mode comprises: feedback, about the actual value of the CQI of a data flow of described the first measurement resource collection, is fed back at least one difference with respect to this actual value in other CQI.
6. the method for claim 1, is characterized in that, describedly measures the feedback of resource collection and describedly measures the feedback of resource collection about described second and adopt identical feedback model about described first.
7. the method for claim 1, is characterized in that, measures resource collection and second measure resource collection the restriction of different sum of ranks codebook subsets is set described first.
8. for a device for the base station equipment of multi-input multi-output system, comprising:
The first module, its first measurement resource collection and second that is configured to the channel condition information that is identified for a subscriber equipment is measured resource collection;
The second module, it is configured to mourn in silence in the described first interferometry resource of measuring in resource collection, transmitted signal in the described second interferometry resource of measuring in resource collection;
The 3rd module, it is configured to according to the alone family channel condition information of determining described subscriber equipment about the described first feedback of measuring resource collection, according to the multiuser channel state information of determining described subscriber equipment about the described second feedback of measuring resource collection.
9. device as claimed in claim 8, is characterized in that, described the second module is also configured to send message to indicate described first to measure resource collection and the second measurement resource collection to described subscriber equipment.
10. device as claimed in claim 8, it is characterized in that, the pre-coding matrix of the signal sending in the described second zero energy channel state information reference signals resource of measuring in resource collection is mutually orthogonal with the pre-coding matrix that is carried on the data-signal on identical physical resources piece.
11. devices as claimed in claim 8, it is characterized in that, described the second module is also configured to send message to indicate described subscriber equipment to carry out the described feedback about described the first measurement resource collection and the described feedback about described the second measurement resource collection with differential mode.
12. devices as claimed in claim 11, is characterized in that, described differential mode comprises: feedback, about the actual value of the CQI of a data flow of described the first measurement resource collection, is fed back at least one difference with respect to this actual value in other CQI.
13. devices as claimed in claim 8, is characterized in that, describedly measure the feedback of resource collection and describedly measure the feedback of resource collection about described second and adopt identical feedback model about described first.
14. devices as claimed in claim 8, is characterized in that, measure resource collection and second measure resource collection the restriction of different sum of ranks codebook subsets is set in described the first module to described first.
15. 1 kinds of base station equipments for multi-input multi-output system, it comprises the device described in any one in claim 8-14.
16. 1 kinds of methods for the information feedback of multi-input multi-output system, comprising:
Detect first and measure resource collection and the second measurement resource collection;
Carry out about described first and measure the information feedback of resource collection and the information feedback about described the second measurement resource collection with differential mode.
17. methods as claimed in claim 16, is characterized in that, describedly measure the feedback of resource collection and describedly measure the feedback of resource collection about described second and adopt identical feedback model about described first.
18. methods as claimed in claim 16, is characterized in that, described differential mode comprises: feedback, about the actual value of the CQI of a data flow of described the first measurement resource collection, is fed back at least one difference with respect to this actual value in other CQI.
19. 1 kinds of devices for the subscriber equipment of multi-input multi-output system, comprising:
Detection module, it is configured to detect the first measurement resource collection and second and measures resource collection;
Feedback module, it is configured to carry out about described first and measure the information feedback of resource collection and the information feedback about described the second measurement resource collection with differential mode.
20. devices as claimed in claim 19, is characterized in that, describedly measure the feedback of resource collection and describedly measure the feedback of resource collection about described second and adopt identical feedback model about described first.
21. devices as claimed in claim 19, is characterized in that, described differential mode comprises: feedback, about the actual value of the CQI of a data flow of described the first measurement resource collection, is fed back at least one difference with respect to this actual value in other CQI.
22. 1 kinds of subscriber equipmenies for multi-input multi-output system, it comprises the device described in any one in claim 19-21.
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