CN102685797B - Remote radio head (RRH) enhancing cooperation multipoint transmission system and channel state information-regenerator section (CSI-RS) configuration method thereof - Google Patents

Remote radio head (RRH) enhancing cooperation multipoint transmission system and channel state information-regenerator section (CSI-RS) configuration method thereof Download PDF

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Publication number
CN102685797B
CN102685797B CN201110058252.6A CN201110058252A CN102685797B CN 102685797 B CN102685797 B CN 102685797B CN 201110058252 A CN201110058252 A CN 201110058252A CN 102685797 B CN102685797 B CN 102685797B
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China
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base station
user equipment
csi
rrh
comp user
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CN102685797A (en
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黄磊
杨曾
丁铭
刘仁茂
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Sharp Corp
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Sharp Corp
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Priority to PCT/JP2012/055731 priority patent/WO2012124551A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/022—Site diversity; Macro-diversity
    • H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0626—Channel coefficients, e.g. channel state information [CSI]

Abstract

A RRH enhancing cooperation multipoint transmission system comprises a base station, non CoMP user equipment and CoMP user equipment, wherein the base station is used for transmitting CSI-RS resource configuration parameters of the base and each of the RRH in the community to all user equipment in the community through broadcast channels, transmitting common CSI-RS resource configuration parameters in the community to non CoMP user equipment through radio resource control (RRC) signaling, and informing CoMP user equipment of transmission point sets needed to be measured through RRC signaling; the non CoMP user equipment measures channel states by using the common CSI-RS resource configuration parameters and feeds measurement results back to the base station through upstream channels; and the CoMP user equipment measures channel states of transmission points listed in the transmission point sets by using the CSI-RS resource configuration parameters of all transmission points transmitted by the base station, and feeds measurement results back to the base station through upstream channels. According to the RRH enhancing cooperation multipoint transmission system and the CSI-RS configuration method thereof, multiple cooperation and multipoint transmission scenes are well matched by configuring CSI-RS resources in the system effectively.

Description

RRH strengthens cooperative multicast system and its CSI-RS collocation methods
Technical field
The present invention relates to mobile communication technology field, more particularly, to a kind of RRH strengthen cooperative multicast system and Its channel condition information reference signaling (CSI-RS, Channel StateInformation-Reference Signal) configuration Method, the collocation method is used for using the mobile communication system of cooperative multipoint transmission pattern.
Background technology
In April, 2008, third generation partner program (3GPP) is organized in China Shenzhen and has held with regard to of future generation international The seminar of mobile communication system IMT-Advanced.In this seminar, need of each major company to 4G mobile communication system Ask and analyze, and the key technology to adopting is inquired into.In numerous technology motions, a kind of entitled " cooperation The technology of multicast communication " has obtained extensive concern and support, and its core concept is to adopt multiple base stations simultaneously for one or many Individual user equipment provides communication service, so as to improve the message transmission rate of the user equipment positioned at cell boarder.3GPP without In the follow-up meeting that the working group of line access first (RAN1) holds, the feedback side of mode and correlation to cooperative multipoint transmission Formula has carried out the discussion of correlation.In newest (the 3GPP TSG RAN E-UTRA of 3GPP technical report 3GPP TR 36.814 Furtheradvancements for E-UTRA physical layer aspects (Release 9)) in, it is many cooperating The mode of point transmission is divided into two big class.The first kind is referred to as Combined Treatment (Joint Processing), i.e. user equipment can be from Any point (i.e. any one base station) for carrying out cooperative multipoint transmission receives corresponding data transfer, and such mode is included again Joint transmission (Joint Transmission) and dynamic cell select (Dynamic cell selection) two ways.Connection Close transmission and refer to that multiple cooperative base stations of a certain moment are simultaneously certain user's transmission data；And dynamic cell selects then to refer to certain for the moment Carve and select one of cooperative base station to be certain user's transmission data.Equations of The Second Kind be cooperative scheduling/beam shaping, i.e., by with it is many Individual cooperative base station carries out cooperative scheduling/beam shaping, by serving BS to user device transmissions data.In addition, in 3GPP TR In 36.814, the feedback system to supporting cooperative multipoint transmission has done corresponding classification, and the first kind is explicit (explicit) letter Channel state information feeds back, and Equations of The Second Kind is implicit expression (implicit) information feedback, and the 3rd class is to utilize channel reciprocity Channel condition information estimation is carried out by SRS (Sounding RS).Above-mentioned three classes mode can be passed by coordinate multipoint of independent assortment It is defeated that effective information feedback is provided.
For multiple cooperative base stations carry out cooperative multipoint transmission, a problem that can not be ignored is exactly rear number of units between base station According to the latency issue of transmission.Cooperative multipoint transmission needs very quick and substantial amounts of back-end data to exchange, and LTE- at present Back office interface defined in Advanced systems far can not then meet such requirement.In order to ensure cooperative multipoint transmission Technology can use conscientiously in actual mobile communication system, while the standardized processes of LTE-Advanced are further speeded up, it is each big Company is all gathered in sight on RRH (Remote Radio Head) enhanced network architecture.
RRH or RRE (Remote Radio Equipment) is generally referred to as remote base stations (Remote Base again Station), spaced antenna etc..Such as list of references (R1-084254, NTTDoCoMo, Application of Remote Radio Equipment to LTE-Advanced, 3GPPTSG RAN1 Meeting #55) described in, RRH is away from central authorities The radio transceiver point that of control base station zooms out, typically only include radio-frequency receiving-transmitting function, analog to digital-digital to analog converter function with And optical fiber modulation /demodulation function, and all of base band signal process function, scheduling feature are all located at central control base station.RRH with It is attached to ensure the interaction of low delay and Large Volume Data by the optical fiber of high speed between central control base station.At present, join Examine document (R1-110603, NTT DoCoMo, CoMPSimulation Assumption, 3GPP TSG RAN 1Meeting # The four kinds of application scenarios listed in 63bis) are unanimously approved as carrying out cooperative multipoint transmission in LTE-Advanced systems Basic scene.Scene one is cooperative multipoint transmission scene in site, i.e., assisted positioned between three different districts of same site Make multicast communication.Scene two is the cooperative multipoint transmission scene of high power RRH cooperations, i.e. each RRH has and base station identical Transmission power and coverage.Scene three and scene four be low-power RRH cooperation cooperative multipoint transmission scene, wherein each RRH has less transmission power and coverage, and within the coverage of own base station.Difference is scene three In, each RRH has independent cell ID different from base station, and in scene four, each RRH and base station possess identical cell ID.In above-mentioned scene, in addition to scene one, other three kinds of application scenarios are all based on the enhanced cooperative multipoint transmission scenes of RRH.
Another problem for meriting attention of cooperative multipoint transmission technology is that how to carry out effective channel condition information anti- Feedback.In newest 3GPP technical report 3GPP TR 36.814, there are some preliminary with regard to information feedback Conclusion.Point out in the technical report, carry out to be used as based on the independent feedback of single cell by the ascending resource of serving BS The benchmark of cooperative multipoint transmission feedback system, i.e. user equipment are fed back respectively by the ascending resource of Serving cell to serving BS The channel condition information of adjacent cooperation cell.However, due to the introducing of RRH, the topological structure of network has new change, to upper The conclusion stated needs further to be studied and expanded.For example, due to RRH have the site different from base station, between RRH or Cooperative multipoint transmission is carried out between person RRH and base station, according to above-mentioned conclusion, if need to each cooperation RRH or base station with Wireless channel between user equipment carries out the measurement of single channel condition information, if desired, how to measure.
In list of references (R1-110649, Ericsson, Aspects on Distributed RRUs withShared Cell-ID for Heterogeneous Deployments, 3GPP TSG RAN1 Meeting#64) in, Ericsson proposes Different channels are configured on different launch points (Transmission Point, including base station and coupled RRH) State information references signaling (CSI-RS) resource, it is semi-static according to the position of user equipment or the measurement result of up-link Configuring its CSI-RS is used for the measurement of channel condition information.The program has reused as far as possible existing in current standardization Mechanism, it is achieved thereby that strengthening the information feedback under network topology structure in RRH.But the program has one asks Topic, is exactly for LTE-Advanced user equipmenies, to move in the coverage of a RRH from this cell another In the coverage of individual RRH, the configuration of new CSI-RS, and program acquiescence will be triggered from a launch point transmission Data, then LTE-Advanced user equipmenies cannot just obtain the RRH transmitting to be brought originally merging gains.
Based on the problems referred to above, how present invention subject matter of interest is in the enhanced cooperative multi-point transmission networks of RRH CSI-RS is configured in structure, to realize legacy User Equipment (Legacy UE, that is, LTE-Advanced user equipmenies) With the feedback that (LTE-AdvancedBeyond) user equipment after LTE-Advanced effectively carries out channel condition information.
The content of the invention
In order to solve the problems referred to above of prior art, the invention provides RRH strengthen cooperative multicast system and CSI-RS collocation methods.
The present invention a kind of RRH strengthen cooperative multicast system include base station, one or more RRH, one or more CoMP user equipment or non-CoMP user equipment, base station and the RRH are used to pass through as the transfer point in cell, wherein base station Channel condition information reference signaling of the broadcast channel to base station and each RRH in all this cells of user device transmissions of this cell CSI-RS configuration parameter, gives public in non-CoMP user device transmission this cell by radio resource control RRC signaling CSI-RS configuration parameter, notifies that CoMP user equipment needs the transmission point set of measurement by RRC signaling；The RRH, leads to Cross optical fiber to be attached with base station, the data exchange of Large Copacity, two-forty is carried out between base station；Non- CoMP user equipment, profit The public CSI-RS configuration parameter transmitted with base station, in the corresponding resources of the public CSI-RS channel status survey is carried out Amount, and by up channel to base station feedback measurement result；CoMP user equipment, using base station by each of broadcast channel transmission The CSI-RS configuration parameter of transfer point, to transfer point listed in transmission point set channel status measurement is carried out, and is led to Up channel is crossed to base station feedback measurement result.
Another RRH of the present invention strengthen cooperative multicast system include base station, one or more RRH, one or many Individual CoMP user equipment or non-CoMP user equipment, base station and the RRH as the transfer point in cell, wherein：Base station passes through Radio resource control RRC signaling gives the resource configuration parameter of CSI-RS public in non-CoMP user device transmission this cell, and And notify that CoMP user equipment needs the CSI-RS configuration parameter information of the transfer point of measurement by RRC signaling；The RRH passes through Optical fiber is attached with base station, and the data exchange of Large Copacity, two-forty is carried out between base station；Non- CoMP user equipment utilization institute Public CSI-RS configuration parameter is stated, in the corresponding resources of the public CSI-RS channel status measurement is carried out, and passed through Up channel is to base station feedback measurement result；The biography of the needs measurement that CoMP user equipment utilization base station is notified by RRC The CSI-RS configuration parameter information of defeated point, surveys to the channel status of channel between each transfer point and the CoMP user equipment Amount.
Another RRH of the present invention strengthen cooperative multicast system include base station, one or more RRH, one or many Individual CoMP user equipment or non-CoMP user equipment, base station and the RRH as the transfer point in cell, wherein：Base station passes through Radio resource control RRC signaling gives the resource configuration parameter of CSI-RS public in non-CoMP user device transmission this cell, and And the serial number information of the transfer point that the CoMP user equipment needs to measure, all biographies in cell are notified by RRC signaling Defeated o'clock each with a unique sequence number；The RRH, is attached by optical fiber with base station, and great Rong is carried out between base station Amount, the data exchange of two-forty；Non- CoMP user equipment, it is public at this using the public CSI-RS configuration parameter Channel status measurement is carried out in the corresponding resources of CSI-RS, and by up channel to base station feedback measurement result；CoMP user Equipment, using biography of the reference signaling sequence related to transfer point sequence number in the resource of public CSI-RS respectively to needing to measure Defeated point carries out channel measurement.
Another RRH of the present invention strengthen cooperative multicast system include base station, one or more RRH, one or many Individual CoMP user equipment or non-CoMP user equipment, base station and the RRH as the transfer point in cell, wherein：Base station is used for By channel condition information reference signaling CSI- from broadcast channel to each RRH in all this cells of user device transmissions of this cell RS resource configuration parameters, by radio resource control RRC signaling to non-CoMP user equipment or CoMP user device transmission base station CSI-RS configuration parameter, notify that CoMP user equipment needs the transmission point set of measurement by RRC signaling；The RRH It is attached with base station by optical fiber, the data exchange of Large Copacity, two-forty is carried out between base station；Non- CoMP user equipment profit The CSI-RS configuration parameter transmitted with base station, base station is carried out in the corresponding resources of the CSI-RS and is set with the non-CoMP user Channel status measurement between standby, and by up channel to base station feedback measurement result；CoMP user equipment is according to transfer point The resource configuration parameter of aggregate information and the base station for receiving and the CSI-RS on each RRH, carries out each transfer point and is somebody's turn to do Channel status measurement between CoMP user equipment, and measurement result is fed back to into base station by up channel.
Another RRH of the present invention strengthen cooperative multicast system include base station, one or more RRH, one or many Individual user equipment, base station and the RRH as the transfer point in cell, wherein, base station be used for by radio resource control RRC believe Make the CSI-RS configuration parameter information of the transfer point for notifying the user equipment to need to measure；The RRH by optical fiber with Base station is attached, and the data exchange of Large Copacity, two-forty is carried out between base station；User equipment is provided in the configuration of each CSI-RS For the channel status between each corresponding transfer point measurement user equipment and the transfer point on source, and by measurement result by up Channel feedback is to base station.
Another RRH of the present invention strengthen cooperative multicast system include base station, one or more RRH, one or many Individual CoMP user equipment and one or more non-CoMP user equipment, base station and the RRH as the transfer point in cell, its In, base station passes through radio resource control RRC signaling to non-CoMP user equipment or the CSI- of CoMP user device transmission base station RS resource configuration parameters, and notify that the CoMP user equipment needs the sequence number of the transfer point for measuring to believe by RRC signaling Breath, all transfer points in cell are each with a unique sequence number；The RRH is attached by optical fiber with base station, with The data exchange of Large Copacity, two-forty is carried out between base station；Non- CoMP user equipment, is joined using CSI-RS configuration Number, carries out channel status measurement in the corresponding resources of the CSI-RS, and by up channel to base station feedback measurement result； CoMP user equipment, adopts the reference signaling sequence related to transfer point sequence number in the resource of the CSI-RS respectively to needing to survey The transfer point of amount carries out channel measurement.
Another RRH of the present invention strengthens cooperative multicast system, the system include base station, one or more RRH, one Individual or multiple user equipmenies, base station and the RRH as the transfer point in cell, wherein, the base station is different with each RRH transmission Channel condition information reference signaling be used for user equipment channel condition information measurement, each CoMP user equipment is a certain Moment, base station was that the data never transmitted with transfer point carry out different scramblings only from some transfer point receiving data.
Another RRH of the present invention strengthens cooperative multicast system to be included：Base station, one or more RRH, one or many Individual CoMP user equipment or non-CoMP user equipment, base station and the RRH are used to lead to as the transfer point in cell, wherein base station Broadcast channel is crossed to the channel condition information reference signaling CSI-RS of each RRH in all this cells of user device transmissions of this cell Resource configuration parameter, by radio resource control RRC signaling to non-CoMP user equipment or CoMP user device transmission base station CSI-RS configuration parameter, notifies that CoMP user equipment needs the transmission point set of measurement by RRC signaling；Non- CoMP user The CSI-RS configuration parameter of equipment utilization base station transmission, carries out base station and the non-CoMP in the corresponding resources of the CSI-RS Channel status measurement between user equipment, and by up channel to base station feedback measurement result；CoMP user equipment according to The resource configuration parameter of transfer point aggregate information and the base station for receiving and the CSI-RS on each RRH, carries out each transfer point Measure with the channel status between the CoMP user equipment, and measurement result is fed back to into base station by up channel.
Another RRH of the present invention strengthens cooperative multicast system to be included：Base station, one or more RRH, one or many Individual user equipment, base station and the RRH are used to believe by radio resource control RRC as the transfer point in cell, wherein base station Make the CSI-RS configuration parameter information of the transfer point for notifying the user equipment to need to measure；The RRH by optical fiber with Base station is attached, and the data exchange of Large Copacity, two-forty is carried out between base station；User equipment is provided in the configuration of each CSI-RS For the channel status between each corresponding transfer point measurement user equipment and the transfer point on source, and by measurement result by up Channel feedback is to base station.
Another RRH of the present invention strengthen cooperative multicast system include base station, one or more RRH, one or many Individual CoMP user equipment and one or more non-CoMP user equipment, base station and the RRH as the transfer point in cell, its Middle base station passes through radio resource control RRC signaling to non-CoMP user equipment or the CSI-RS of CoMP user device transmission base station Resource configuration parameter, and the serial number information of the transfer point that the CoMP user equipment needs to measure is notified by RRC signaling, All transfer points in cell are each with a unique sequence number；The RRH is attached by optical fiber with base station, with base station Between carry out the data exchange of Large Copacity, two-forty；CSI-RS configuration parameter described in non-CoMP user equipment utilization, at this Channel status measurement is carried out in the corresponding resources of CSI-RS, and by up channel to base station feedback measurement result；CoMP user Transmission of the equipment using the reference signaling sequence related to transfer point sequence number in the resource of the CSI-RS respectively to needing to measure Point carries out channel measurement.
The invention allows for a kind of RRH strengthens the reference signaling collocation method in cooperative multicast system, the method Including step：Base station passes through channel of the broadcast channel to base station and each RRH in all this cells of user device transmissions of this cell State information references signaling CSI-RS configuration parameter, is passed by radio resource control RRC signaling to non-CoMP user equipment Public CSI-RS configuration parameter in defeated cell, notifies that CoMP user equipment needs the transmission of measurement by RRC signaling Point set；The public CSI-RS configuration parameter of non-CoMP user equipment utilization base station transmission, in the public CSI-RS correspondences Resource on carry out channel status measurement, and by up channel to base station feedback measurement result；CoMP user equipment utilization base The CSI-RS configuration parameter of each transfer point stood by broadcast channel transmission, to transfer point listed in transmission point set Channel status measurement is carried out, and by up channel to base station feedback measurement result.
The invention allows for a kind of RRH strengthens the reference signaling collocation method in cooperative multicast system, the method Including step：CSI-RS public in non-CoMP user device transmission this cell is given in base station by radio resource control RRC signaling Resource configuration parameter, and notify that CoMP user equipment needs the CSI-RS configuration ginsengs of the transfer point of measurement by RRC signaling Number information；Public CSI-RS configuration parameter described in non-CoMP user equipment utilization, in the corresponding moneys of the public CSI-RS Channel status measurement is carried out on source, and by up channel to base station feedback measurement result；CoMP user equipment utilization base station leads to The CSI-RS configuration parameter information of the transfer point of the needs measurement of RRC notices is crossed, each transfer point is set with the CoMP user The channel status of channel is measured between standby.
The invention allows for a kind of RRH strengthens the reference signaling collocation method in cooperative multicast system, including step Suddenly：Base station gives the resource of CSI-RS public in non-CoMP user device transmission this cell by radio resource control RRC signaling Configuration parameter, and the serial number information of the transfer point that the CoMP user equipment needs to measure, cell are notified by RRC signaling Interior all transfer points are each with a unique sequence number；Public CSI-RS is matched somebody with somebody described in non-CoMP user equipment utilization Parameter is put, channel status measurement is carried out in the corresponding resources of the public CSI-RS, and surveyed to base station feedback by up channel Amount result；CoMP user equipment is distinguished using the reference signaling sequence related to transfer point sequence number in the resource of public CSI-RS Transfer point to needing measurement carries out channel measurement.
Using the system and method for the present invention so that under cooperative multipoint transmission pattern, by effectively matching somebody with somebody in systems CSI-RS patterns are put, possible cooperative multipoint transmission scene in LTE-Advanced systems has been well matched with.
It is concrete such as herein and extensively retouch in order to realize these and/or other advantages, and according to the purpose of the present invention State, the present invention is embodied in RRH strengthens channel condition information reference signaling in cooperative multicast system and the system (CSI-RS) collocation method.
Description of the drawings
By illustrating the preferred embodiments of the present invention below in conjunction with the accompanying drawings, above and other purpose, the spy of the present invention will be made Advantage of seeking peace is clearer, wherein：
Fig. 1 is the schematic diagram that the first RRH of the present invention strengthens cooperative multicast system；
Fig. 2 is the schematic diagram that the 2nd RRH of the present invention strengthens cooperative multicast system；
Fig. 3-5 is the CSI-RS configuration signal flow charts that the first and second RRH of the invention strengthens cooperative multicast system；
Fig. 6 is that the 3rd RRH of the present invention strengthens cooperative multicast system schematic diagram；
Fig. 7-9 is the CSI-RS configuration signal flow charts that the 3rd RRH of the present invention strengthens cooperative multicast system；
Figure 10 is the schematic diagram that the 4th RRH of the present invention strengthens cooperative multicast system.
Specific embodiment
First-selected embodiment of the invention will below combine accompanying drawing and be described.During following description, eliminate It is for the present invention unnecessary details and function, to prevent the understanding of the present invention from causing to obscure.
Process is realized for the clearly detailed elaboration present invention, the specific embodiment of the present invention is shown below is, is suitable for In the enhanced mobile communication system of RRH, especially LTE-Advanced cell mobile communication systemses and its later evolution system. It should be noted that the invention is not restricted to these applications described in embodiment, and can be applied to more other correlations Communication system, such as 5G cellular communication systems from now on.
Before embodiment of the present invention description is carried out, first to the CSI-RS related contents defined in LTE-Advanced systems Carry out brief description.In LTE-Advanced systems, base station equipment is semi-static by wireless heterogeneous networks (RRC) signaling The user device configuration CSI-RS parameter that certain is specified.The parameter such as list of references (3GPP TS 36.331 V10.0.0,3GPP TSG RANE-UTRA RRC Protocol specification) described in, including following keyword Section：
CSI-RS mapping positions, i.e., in certain subframe, which Resource Unit (RE CSI-RS is specifically mapped to： Resource Element) on.In the standardization document (V10.0.0 of 3GPP TS 36.211,3GPP TSG RAN E-UTRA Physical channels and modulation) in, 32 kinds of different mapped modes are defined for adopting normal circulation Prefix (CP：Cyclic Prefix) subframe structure, wherein front 20 kinds of patterns be applied to FDD system.
CSI-RS sub-frame configurations, i.e., in the CSI-RS of which sub-frame transmission special user equipment.In standardization document 3GPP 155 kinds of different configuration modes defined in TS 36.211.Different CSI-RS sub-frame configurations have different configuration cycle or Person's side-play amount.
For above-mentioned CSI-RS parameter configuration is combined by CSI-RS mapping positions and CSI-RS sub-frame configurations, root According to the definition of standardization document, for the FDD system using normal cyclic prefix, if 1 or 2 antenna its available configuration of configuration Number of combinations at most can reach 3100, if 4 antenna its available configuration number of combinations of configuration at most can reach 1550, if matched somebody with somebody 8 antennas its available configuration number of combinations is put at most up to 775.CSI-RS defined in LTE-Advanced systems as can be seen here Resource parameters configuration is quite more than needed.
In addition to CSI-RS parameter configuration, by the reference signaling sequence (Reference-signal of actual transmissions Sequence) different CSI-RS can also be distinguished.The CSI-RS defined in the standardization document 3GPP TS 36.211 is with reference to letter The process for making sequence produce, the reference signaling sequence is a pseudo-random sequence, is determined by an initial value related to cell ID It is fixed.For the system of normal cyclic prefix, the initial value isIts Middle nsFor timeslot number, l is the sequence number of OFDM symbol,For cell ID.The reference signaling sequence is related with cell ID, Neng Gouyou The CSI-RS interference of the suppression minizone of effect.
By the above-mentioned CSI-RS parameter configuration parameter of notifying user equipment, user equipment i.e. can be in specified CSI- In RS resources, using the known reference signaling sequence based on cell ID, the measurement of corresponding channel condition information is carried out.
Fig. 1 is that the first RRH of the present invention strengthens cooperative multicast system schematic diagram.
As shown in figure 1, the RRH strengthens cooperative multicast system includes that base station, a RRH and the 2nd RRH, non-CoMP are used Family equipment and CoMP user equipment.Fig. 1 is only exemplary, and RRH therein and number of user equipment are not limited to institute in figure Show, can be one or more, the system of the invention that will be detailed below being described with reference to other accompanying drawings is also analogue.
Wherein a RRH and the 2nd RRH are connected by optical fiber with base station, can carry out the data exchange of Large Copacity, two-forty. The function of RRH is relatively easy, only includes rf data transmitting-receiving, analog to digital-digital to analog converter and light modulation demodulation function, and the RRH Do not possess single cell ID, cell ID public with base station equipment.The process of base band and the scheduling of resource pass through base Stand to realize.In the system, the signal that RRH has identical transmission power, base station with base station is covered and a RRH and second The scope that RRH is covered is suitable.
Fig. 2 is the schematic diagram that the 2nd RRH of the present invention strengthens cooperative multicast system.
As shown in Fig. 2 the RRH strengthens cooperative multicast system includes that base station, a RRH and the 2nd RRH, non-CoMP are used Family equipment and CoMP user equipment.
Wherein a RRH and the 2nd RRH are connected by optical fiber with base station, can carry out the data exchange of Large Copacity, two-forty. The function of RRH is relatively easy, only includes rf data transmitting-receiving, analog to digital-digital to analog converter and light modulation demodulation function, and the RRH Do not possess single cell ID, cell ID public with base station equipment.The process of base band and the scheduling of resource pass through base Stand to realize.In the system, the signal that RRH has less transmission power, base station can cover whole cell including a RRH The scope covered with the 2nd RRH.
Strengthening cooperative multicast system and the 2nd RRH in an above-mentioned RRH strengthens in cooperative multicast system, cell A public channel condition information reference signaling is transmitted in interior base station with each RRH (including RRH and the 2nd RRH) to be used for Non- CoMP user equipment carries out the measurement of channel condition information under the pattern 9 defined in LTE-Advanced.In one cell Base station and each RRH transmit different channel condition information reference signalings respectively (herein CoMP used for CoMP user equipment Family equipment is the user equipment using cooperative multipoint transmission pattern from multiple transmission point receiving data) carry out corresponding channel status Measurement.Such as base station, a RRH and the 2nd RRH transmit a public reference signaling CSI-RS0 and set for non-CoMP user Standby channel status measurement, in addition base station, a RRH and the 2nd RRH distinguish transmitting channel state information reference signaling CSI- RS1, CSI-RS2 and CSI-RS3 are used for the measurement of the channel condition information of CoMP user equipment in cell.For non-CoMP user (herein non-CoMP user equipment is the user equipment using tradition from single transmission point receiving data) equipment, if it is by base station The 9 times work of pattern being configured to defined in LTE-Advanced, then by the channel status of multiple launch point transmittings in cell Information reference signaling CSI-RS0 carries out the measurement of channel status, and its channel status for obtaining of measurement is multiple transmission point to non- The channel status of one combined channel of CoMP user equipment.It is many by what is obtained and CoMP user equipment is then configured according to it Individual different channel condition information reference signaling resource configuration parameter is respectively to the multiple transmission point (including base station and RRH) of surrounding The channel status for obtaining each transfer point to each channel between the user equipment is measured respectively.For example, such as Fig. 1 institutes Show, CoMP user equipment can measure base station to the state status of channel between the user equipment by CSI-RS1, pass through CSI-RS2 can measure a RRH to the state status of channel between the user equipment, can be measured by CSI-RS3 State status of 2nd RRH to channel between the user equipment.
Fig. 3 is the first that CSI-RS parameter configurations are carried out to CoMP user equipment in above-mentioned first and second Transmission system Signaling process figure.
With reference to Fig. 1, Fig. 2 and Fig. 3, in above-mentioned first and second Transmission system, base station equipment passes through broadcast channel (for example D-BCH defined in LTE-Advanced systems, Dynamic BroadcastChannel) to the user equipment (bag of this cell Include CoMP user equipment and non-CoMP user equipment) transmit the letter in each transfer point (including base station and each RRH) in this cell The resource configuration parameter of channel state information reference signaling.For example, base station equipment informs that this is little by Dynamic Broadcast Channel (D-BCH) (LTE-Advanced Beyond) user equipment after all LTE-Advanced in area, there is 3 transfer points, 1 base station in the cell With 2 RRH, base station using CSI-RS1 resource configuration parameter, a RRH using CSI-RS2 resource configuration parameter, second RRH adopts the configuration parameter of CSI-RS3.
Base station is by wireless heterogeneous networks (RRC) signaling to CSI-RS public in user device transmissions this cell specified Resource configuration parameter.In above-mentioned first and second Transmission system, base station is used by radio resource control signaling to non-CoMP The resource configuration parameter of public CSI-RS0 in the device transmission cell of family.Then the non-CoMP user equipment is to receive this public After CSI-RS0 resource configuration parameters, the measurement of channel information is carried out in the corresponding resources of CSI-RS0.Certainly, base station can also By radio resource control signaling to CSI-RS0 public in CoMP user device transmission cell configuration parameter.The then CoMP User equipment carries out channel information after the public CSI-RS0 resource configuration parameters are received in the corresponding resources of CSI-RS0 Measurement, the measurement result obtained by this can provide foundation to base station as switching between CoMP patterns and non-CoMP patterns.
Base station signals the transmission point set that the CoMP user equipment needs to measure by wireless heterogeneous networks (RRC) Conjunction information, wherein the transfer point included in transmission point set is that base station is specified and CoMP user needs to carry out CSI surveys to it The RRH of amount.For example, it is base station, a RRH and second that base station notifies that the CoMP user equipment needs the transmission point set of measurement RRH, then CoMP user equipment is according to the channel status in this transfer point aggregate information and above-mentioned each transfer point for receiving The resource configuration parameter of information reference signaling, carries out base in the configuration resource of CSI-RS1, CSI-RS2 and CSI-RS3 respectively Stand, the channel status of channel is measured between a RRH and the 2nd RRH and CoMP user equipment.
User equipment (including CoMP user equipment and non-CoMP user equipment) is according to corresponding to specific mode of operation Feedback system, by up channel to base station feedback channel condition information.
Fig. 4 is carry out CSI-RS parameter configurations in above-mentioned first and second Transmission system to CoMP user equipment second Signaling process figure.
With reference to Fig. 1, Fig. 2 and Fig. 4, base station is by wireless heterogeneous networks (RRC) signaling to the user device transmissions sheet specified The resource configuration parameter of public CSI-RS in cell.For example, base station is set by radio resource control signaling to non-CoMP user The resource configuration parameter of public CSI-RS0 in standby transmission cell.Then the non-CoMP user equipment is receiving the public CSI-RS0 After resource configuration parameter, the measurement of channel information is carried out in the corresponding resources of CSI-RS0.Certainly, base station can also pass through nothing Configuration parameter of the line resource control signaling to CSI-RS0 public in CoMP user device transmission cell.Then the CoMP user sets For after the resource configuration parameter for receiving the public CSI-RS0, the survey of channel information is carried out in the corresponding resources of CSI-RS0 Amount, the measurement result obtained by this can provide foundation to base station as switching between CoMP patterns and non-CoMP patterns.
Base station signals the transfer point that CoMP user equipment needs are measured by wireless heterogeneous networks (RRC) CSI-RS configuration parameter.In above-mentioned first and second Transmission system, base station notifies the CoMP user equipment in CSI- Channel between base station, a RRH and the 2nd RRH and user equipment is carried out in the configuration resource of RS1, CSI-RS2 and CSI-RS3 Channel status is measured.Then CoMP user equipment is according to the CSI-RS configuration parameter information in each transfer point for receiving, difference Carry out base station, a RRH and the 2nd RRH and the CoMP user in the configuration resource of CSI-RS1, CSI-RS2 and CSI-RS3 to set The channel status measurement of channel between standby.
User equipment (including CoMP user equipment and non-CoMP user equipment) is according to corresponding to specific mode of operation Feedback system, by up channel to base station feedback channel condition information.
Fig. 5 is the third that CSI-RS parameter configurations are carried out to CoMP user equipment in above-mentioned first and second Transmission system Signaling process figure.
With reference to Fig. 1, Fig. 2 and Fig. 5, base station is by wireless heterogeneous networks (RRC) signaling to the user device transmissions sheet specified The resource configuration parameter of public CSI-RS in cell.For example, base station is set by radio resource control signaling to non-CoMP user The resource configuration parameter of public CSI-RS0 in standby transmission cell.Then the non-CoMP user equipment is receiving the public CSI-RS0 Resource configuration parameter after, the measurement of channel information is carried out in the corresponding resources of CSI-RS0.Certainly, base station can also pass through Configuration parameter of the radio resource control signaling to CSI-RS0 public in CoMP user device transmission cell.The then CoMP user Equipment carries out the survey of channel information after the resource configuration parameter for receiving the public CSI-RS0 in the corresponding resources of CSI-RS0 Amount, the measurement result obtained by this can provide foundation to base station as switching between CoMP patterns and non-CoMP patterns.
Base station signals the transfer point that CoMP user equipment needs are measured by wireless heterogeneous networks (RRC) Serial number information.All transfer points in cell have a unique numbering, it is assumed that default list intra-cell transmission point number The upper limit be 32, then the transfer point in cell is numbered can one by one from 0 to 31.For example, if base station is No. 0, a RRH is No. 1, 2nd RRH is No. 2.Then base station notifies the serial number 0,1 of transfer point that CoMP user equipment needs to measure by RRC signaling With 2.And CoMP user equipment is distinguished using the reference signaling sequence related to transfer point sequence number in the resource of public CSI-RS0 Such as transfer point to needing measurement carries out channel measurement, and wherein channel measurement is prior art, is exactly in LTE-Advanced Channel measurement is carried out in this way.In the embodiment, the resource distribution of above-mentioned CSI-RS1,2 and 3 is not used, but passed through Different sequences is distinguishing CSI-RS.
Definition in reference standard document 3GPP TS 36.211, the CSI-RS reference signaling sequences in each transfer point Initial Value definition beWherein ns is time slot Number, l is the sequence number of OFDM symbol,For cell ID,For transfer point sequence number.In identical CSI-RS, by not Same reference signaling sequence can distinguish different transfer points to the channel between user equipment.
User equipment (including CoMP user equipment and non-CoMP user equipment) is according to corresponding to specific mode of operation Feedback system, by up channel to base station feedback channel condition information.
Fig. 6 is that the 3rd RRH of the present invention strengthens cooperative multicast system schematic diagram.
As shown in fig. 6, the RRH strengthens cooperative multicast system includes that base station, a RRH and the 2nd RRH, non-CoMP are used Family equipment and CoMP user equipment.
Wherein a RRH and the 2nd RRH are connected by optical fiber with base station, can carry out the data exchange of Large Copacity, two-forty. The function of RRH is relatively easy, only includes rf data transmitting-receiving, analog to digital-digital to analog converter and light modulation demodulation function, and the RRH Do not possess single cell ID, cell ID public with base station equipment.The process of base band and the scheduling of resource pass through base Stand to realize.In the system, the signal that RRH has less transmission power, base station can cover whole cell including a RRH The scope covered with the 2nd RRH.
Different channel condition information reference signalings are transmitted in base station from each RRH (including a RRH and the 2nd RRH) to be used for The measurement of the channel condition information of user equipment, such as base station, a RRH and the 2nd RRH difference transmitting channel state information ginsengs Signaling CSI-RS0, CSI-RS1 and CSI-RS2 are examined for the measurement of the channel condition information of intra-cell users equipment.Base station has Larger transmission power, can cover whole cell range.The cell all user equipmenies (including non-CoMP user equipment and CoMP user equipment) signal of Base Transmitter, including data signal and reference signaling can be received.RRH then has less Transmission power, and its wireless signal can only cover less scope.
In the system, RRH is used only for the transmission carried out under cooperative multipoint transmission pattern that cooperates.RRH is not involved in non- The data transfer of CoMP user equipment.Non- CoMP user equipment carries out point-to-point according to the transmission mode that base station configures with base station Data transfer, the pattern 9 that for example the non-CoMP user equipment is configured to defined in LTE-Advanced carries out data transmission, then The non-CoMP user equipment-U001 needs the channel condition information reference signaling CSI-RS0 for using transmission on base station to carry out channel The measurement of state.CoMP user equipment is then configured according to it, by different channel condition information reference signalings to many of surrounding Individual transfer point (including base station and RRH) measures obtain its channel condition information respectively.As shown in fig. 6, CoMP user equipment Base station can be measured to the state status of channel between the CoMP user equipment by CSI-RS0, can be with by CSI-RS1 A RRH is measured to the state status of channel between the CoMP user equipment, the 2nd RRH can be measured by CSI-RS2 To the state status of channel between the CoMP user equipment.
Fig. 7 is to carry out CSI-RS parameters to CoMP user equipment in the 3rd RRH of present invention enhancing cooperative multicast systems The signaling process figure of configuration.
With reference to Fig. 6 and Fig. 7, base station equipment by broadcast channel (such as the D-BCH defined in LTE-Advanced systems, Dynamic Broadcast Channel) (set including CoMP user equipment and non-CoMP user to the user equipment of this cell It is standby) transmit the resource configuration parameter of channel condition information reference signaling in this cell on each RRH.For example, base station equipment is led to Cross Dynamic Broadcast Channel (D-BCH) and inform that (LTE-Advanced Beyond) user sets after all LTE-Advanced of the cell Standby (including CoMP user equipment and non-CoMP user equipment), has 2 RRH, a RRH to match somebody with somebody using CSI-RS1's in the cell Parameter is put, the 2nd RRH adopts the configuration parameter of CSI-RS2.
Resource of the base station by wireless heterogeneous networks (RRC) signaling to the CSI-RS of the user device transmissions base station specified is matched somebody with somebody Put parameter.For example, non-CoMP user equipment or CoMP user device transmission base station are given in base station by radio resource control signaling CSI-RS0 configuration parameter.Non- CoMP user equipment after the resource configuration parameter for receiving the CSI-RS0, at CSI-RS0 pair The measurement of channel information is carried out in the resource answered to the wireless channel between base station and the user equipment.
Base station signals the transmission point set that the CoMP user equipment needs to measure by wireless heterogeneous networks (RRC) Conjunction information.For example, it is base station, a RRH and second that base station notifies that the CoMP user equipment needs the transmission point set of measurement RRH, then CoMP user equipment is according to the channel shape in this transfer point aggregate information and the above-mentioned base station for receiving and each RRH The resource configuration parameter of state information reference signaling, carries out base in the configuration resource of CSI-RS0, CSI-RS1 and CSI-RS2 respectively Stand, the channel status of channel is measured between a RRH and the 2nd RRH and CoMP user equipment.
Feedback system of the user equipment according to corresponding to specific mode of operation, by up channel to base station feedback channel Status information.
Fig. 8 is to carry out CSI-RS parameters to CoMP user equipment in the 3rd RRH of present invention enhancing cooperative multicast systems The another signaling process figure of configuration.
With reference to Fig. 6 and Fig. 8, base station signals user equipment by wireless heterogeneous networks (RRC) needs what is measured The CSI-RS configuration parameter of transfer point.For example, base station notifies CoMP user equipment in CSI-RS0, CSI-RS1 and CSI- The channel status measurement of channel between base station, a RRH and the 2nd RRH and CoMP user equipment is carried out in the configuration resource of RS2. Feedback system of the user equipment according to corresponding to specific mode of operation, is believed by up channel to base station feedback channel status Breath.
Fig. 9 is to carry out CSI-RS parameters to CoMP user equipment in the 3rd RRH of present invention enhancing cooperative multicast systems The another signaling process figure of configuration.
With reference to Fig. 6 and Fig. 9, base station is by wireless heterogeneous networks (RRC) signaling to the user device transmissions base station specified The resource configuration parameter of CSI-RS.For example, base station is used by radio resource control signaling to non-CoMP user equipment or CoMP The configuration parameter of the CSI-RS0 of family device transmission base station.Non- CoMP user equipment is receiving the CSI-RS0 resource configuration parameters Afterwards, the measurement of channel information is carried out to the wireless channel between base station and the user equipment in the corresponding resources of CSI-RS0.
Base station signals the user equipment (non-CoMP user equipment) by wireless heterogeneous networks (RRC) to be needed to measure Transfer point serial number information.All transfer points in cell have a unique numbering, it is assumed that pass in default list cell The upper limit of defeated number is 32, then the transfer point in cell is numbered can one by one from 0 to 31.For example, if base station is No. 0, a RRH is No. 1, the 2nd RRH is No. 2.Then base station notifies the serial number 0,1 of transfer point that CoMP user equipment needs to measure by RRC signaling With 2.And CoMP user equipment adopts the reference signaling sequence related to transfer point sequence number in the resource of public CSI-RS0 respectively to needing The transfer point to be measured carries out channel measurement.Definition in reference standard document 3GPP TS 36.211, in each transfer point The Initial Value definition of CSI-RS reference signaling sequences is Wherein ns is timeslot number, and l is the sequence number of OFDM symbol,For cell ID,For transfer point sequence number.In identical CSI-RS money On source, different transfer points can be distinguished to the channel between user equipment by different reference signaling sequences.User equipment root According to the feedback system corresponding to specific mode of operation, by up channel to base station feedback channel condition information.
Figure 10 is the schematic diagram that the 4th RRH of the present invention strengthens cooperative multicast system.
As shown in Figure 10, a RRH and the 2nd RRH are connected by optical fiber with base station, can carry out the number of Large Copacity, two-forty According to exchange.The function of RRH is relatively easy, only includes rf data transmitting-receiving, analog to digital-digital to analog converter and light modulation demodulation function, And the RRH does not possess single cell ID, cell ID public with base station equipment.The process of base band and the scheduling of resource are equal Realized by base station.
Different channel condition information reference signalings are transmitted in base station from each RRH (including a RRH and the 2nd RRH) to be used for The measurement of the channel condition information of user equipment, such as base station, a RRH and the 2nd RRH difference transmitting channel state information ginsengs Signaling CSI-RS0, CSI-RS1 and CSI-RS2 are examined for the measurement of the channel condition information of intra-cell users equipment.
The user equipment that cooperative multipoint transmission is carried out in the cell is configured to cooperative scheduling/beam shaping or dynamic little The transmission mode that area selects.Under the both of which, certain CoMP user equipment is at a time only from some transfer point reception Data.
A unique numbering is all configured for all transfer points in cell, it is assumed that default list intra-cell transmission point number The upper limit be 32, then the transfer point in cell is numbered can one by one from 0 to 31.In the system of Figure 10, if base station is No. 0, first RRH is No. 1, and the 2nd RRH is No. 2.Base station is that the data never transmitted with transfer point carry out different scramblings.As illustrated, from base The data transmitted of standing can adopt the scrambling based on cell ID defined in LTE-Advanced systems, and from RRH transmission The data scrambling that can carry out based on transfer point sequence number.Specifically, in may be referred to standardization document 3GPP TS 36.211 Definition, the initial value of scrambler sequence can be designed as Wherein nRNTIFor the RNTI (Cell Radio Network Temporary Identifier) number of user equipment, ns is time slot Number, q is the sequence number of code word,For cell ID,For transfer point sequence number.
By said method, scrambled by different sequences to the data transmitted in the different transfer points in cell, Can be from the interference for a certain degree reducing each other, so as to improve the capacity of system.
Within the system, it is suitable for the channel status measuring method of above-mentioned reference picture 7-9 description.
In addition, present invention also offers the CSI-RS collocation methods being applied in RRH enhancing cooperative multicast systems, are somebody's turn to do Method includes following six embodiment.
Embodiment one
With reference to Fig. 3, the method for the embodiment is applied to the RRH enhancing cooperations of the invention of the above-mentioned description that sees figures.1.and.2 In multicast system, the CSI-RS collocation methods include step：
Step 1, base station equipment passes through broadcast channel (such as D-BCH, Dynamic defined in LTE-Advanced systems Broadcast Channel) transmit this to the user equipment (including CoMP user equipment and non-CoMP user equipment) of this cell The resource configuration parameter of the channel condition information reference signaling in cell in each transfer point (including base station and each RRH).For example, Base station equipment informs (LTE- after all LTE-Advanced of the cell by Dynamic Broadcast Channel (D-BCH) AdvancedBeyond) user equipment, there is 3 transfer points, 1 base station and 2 RRH in the cell, base station is using CSI-RS1's Configuration parameter a, RRH adopts the configuration parameter of CSI-RS2, the 2nd RRH to adopt the configuration parameter of CSI-RS3.
Step 2, base station is passed by wireless heterogeneous networks (RRC) signaling to the user equipment (non-CoMP user equipment) specified The resource configuration parameter of public CSI-RS in defeated cell.For example, base station is used by radio resource control signaling to non-CoMP The configuration parameter of public CSI-RS0 in the device transmission cell of family.Then the non-CoMP user equipment is receiving the public CSI-RS0 Resource configuration parameter after, the measurement of channel information is carried out in the corresponding resources of CSI-RS0.Certainly, base station can also pass through Configuration parameter of the radio resource control signaling to CSI-RS0 public in CoMP user device transmission cell.The then CoMP user Equipment carries out the survey of channel information after the public CSI-RS0 resource configuration parameters are received in the corresponding resources of CSI-RS0 Amount, the measurement result obtained by this can provide foundation to base station as switching between CoMP patterns and non-CoMP patterns.
Step 3, base station signals the biography that the CoMP user equipment needs to measure by wireless heterogeneous networks (RRC) Defeated point set information.For example, base station notify the CoMP user equipment need the transmission point set of measurement be base station, a RRH and 2nd RRH, then CoMP user equipment is according to the channel in this transfer point aggregate information and above-mentioned each transfer point for receiving The resource configuration parameter of state information references signaling, is carried out respectively in the configuration resource of CSI-RS1, CSI-RS2 and CSI-RS3 The channel status measurement of channel between base station, a RRH and the 2nd RRH and CoMP user equipment.
Step 4, user equipment (including CoMP user equipment and non-CoMP user equipment) is according to specific mode of operation institute Corresponding feedback system, by up channel to base station feedback channel condition information.
Embodiment two
With reference to Fig. 4, the method for the embodiment is applied to the RRH enhancing cooperations of the invention of the above-mentioned description that sees figures.1.and.2 In multicast system, the CSI-RS collocation methods include step：
Step 1, base station is by wireless heterogeneous networks (RRC) signaling to public in user device transmissions this cell specified The resource configuration parameter of CSI-RS.
For example, CSI-RS0 public in non-CoMP user device transmission cell is given in base station by radio resource control signaling Resource configuration parameter.Then the non-CoMP user equipment is after the public CSI-RS0 resource configuration parameters are received, in CSI-RS0 The measurement of channel information is carried out in corresponding resource.Certainly, base station can also be by radio resource control signaling to CoMP user The configuration parameter of public CSI-RS0 in device transmission cell.Then CoMP user equipment-U002 is receiving the public CSI- After RS0 resource configuration parameters, the measurement of channel information is carried out in the corresponding resources of CSI-RS0, the measurement result obtained by this can To provide foundation as switching between CoMP patterns and non-CoMP patterns to base station.
Step 2, base station signals the biography that the CoMP user equipment needs to measure by wireless heterogeneous networks (RRC) The CSI-RS configuration parameter of defeated point.For example, base station notifies the CoMP user equipment in CSI-RS1, CSI-RS2 and CSI- The channel status measurement of channel between base station, a RRH and the 2nd RRH and user equipment is carried out in the configuration resource of RS3.
Step 3, user equipment (including CoMP user equipment and non-CoMP user equipment) is according to specific mode of operation institute Corresponding feedback system, by up channel to base station feedback channel condition information.
Embodiment three
With reference to Fig. 5, the method for the embodiment is applied to the RRH enhancing cooperations of the invention of the above-mentioned description that sees figures.1.and.2 In multicast system, the CSI-RS collocation methods include step：
Step 1, base station is by wireless heterogeneous networks (RRC) signaling to public in user device transmissions this cell specified The resource configuration parameter of CSI-RS.
For example, CSI-RS0 public in non-CoMP user device transmission cell is given in base station by radio resource control signaling Resource configuration parameter.Then the non-CoMP user equipment is after the public CSI-RS0 resource configuration parameters are received, in CSI-RS0 The measurement of channel information is carried out in corresponding resource.Certainly, base station can also be by radio resource control signaling to CoMP user The configuration parameter of public CSI-RS0 in device transmission cell.Then CoMP user equipment-U002 is receiving the public CSI- After RS0 resource configuration parameters, the measurement of channel information is carried out in the corresponding resources of CSI-RS0, the measurement result obtained by this can To provide foundation as switching between CoMP patterns and non-CoMP patterns to base station.
Step 2, base station signals the transmission that the CoMP user equipment needs to measure by wireless heterogeneous networks (RRC) The serial number information of point.All transfer points in cell have a unique numbering, it is assumed that default list intra-cell transmission point Several upper limits is 32, then the transfer point in cell is numbered can one by one from 0 to 31.For example, if base station is No. 0, a RRH is No. 1, 2nd RRH is No. 2.Then base station notifies serial number 0,1 and of transfer point that CoMP user equipment needs to measure by RRC signaling 2.And CoMP user equipment adopts the reference signaling sequence related to transfer point sequence number in the resource of public CSI-RS0 respectively to needing The transfer point to be measured carries out channel measurement.Definition in reference standard document 3GPP TS 36.211, in each transfer point The Initial Value definition of CSI-RS reference signaling sequences is Wherein ns is timeslot number, and l is the sequence number of OFDM symbol,For cell ID,For transfer point sequence number.In identical CSI-RS money On source, different transfer points can be distinguished to the channel between user equipment by different reference signaling sequences.
Step 3, user equipment (including CoMP user equipment and non-CoMP user equipment) is according to specific mode of operation institute Corresponding feedback system, by up channel to base station feedback channel condition information.
Example IV
With reference to Fig. 7, the method for the embodiment is applied to the above-mentioned RRH of the invention with reference to Fig. 6 descriptions strengthens coordinate multipoint In Transmission system, the CSI-RS collocation methods include step：
Step 1, base station equipment passes through broadcast channel (such as D-BCH, Dynamic defined in LTE-Advanced systems Broadcast Channel) transmit this to the user equipment (including CoMP user equipment and non-CoMP user equipment) of this cell The resource configuration parameter of the channel condition information reference signaling in cell on each RRH.For example, base station equipment passes through dynamic broadcast Channel (D-BCH) informs that (LTE-Advanced Beyond) user equipment is (including CoMP after all LTE-Advanced of the cell User equipment and non-CoMP user equipment), have 2 RRH in the cell, a RRH using CSI-RS1 configuration parameter, second RRH adopts the configuration parameter of CSI-RS2.
Step 2, base station gives the CSI-RS's of the user device transmissions base station specified by wireless heterogeneous networks (RRC) signaling Resource configuration parameter.For example, base station is passed by radio resource control signaling to non-CoMP user equipment or CoMP user equipment The configuration parameter of the CSI-RS0 of defeated base station.Then the user equipment is after the CSI-RS0 resource configuration parameters are received, in CSI-RS0 The measurement of channel information is carried out in corresponding resource to the wireless channel between base station and the user equipment.
Step 3, base station signals the biography that the CoMP user equipment needs to measure by wireless heterogeneous networks (RRC) Defeated point set information.For example, base station notify the CoMP user equipment need the transmission point set of measurement be base station, a RRH and 2nd RRH, then CoMP user equipment is according to the letter in this transfer point aggregate information and the above-mentioned base station for receiving and each RRH The resource configuration parameter of channel state information reference signaling, it is enterprising in the configuration resource of CSI-RS0, CSI-RS1 and CSI-RS2 respectively The channel status measurement of channel between row base station, a RRH and the 2nd RRH and CoMP user equipment.
Step 4, feedback system of the user equipment according to corresponding to specific mode of operation is anti-to base station by up channel Feedback channel condition information.
Embodiment five
With reference to Fig. 8, the method for the embodiment is applied to the above-mentioned RRH of the invention with reference to Fig. 6 descriptions strengthens coordinate multipoint In Transmission system, the CSI-RS collocation methods include step：
Step 1, base station signals the transfer point that user equipment needs are measured by wireless heterogeneous networks (RRC) CSI-RS configuration parameter information.For example, base station notifies CoMP user equipment in the configuration of CSI-RS0, CSI-RS1 and CSI-RS2 The channel status measurement of channel between base station, a RRH and the 2nd RRH and CoMP user equipment is carried out in resource.
Step 2, feedback system of the user equipment according to corresponding to specific mode of operation is anti-to base station by up channel Feedback channel condition information.
Embodiment six
With reference to Fig. 9, the method for the embodiment is applied to the above-mentioned RRH of the invention with reference to Fig. 6 descriptions strengthens coordinate multipoint In Transmission system, the CSI-RS collocation methods include step：
Step 1, base station gives the CSI-RS's of the user device transmissions base station specified by wireless heterogeneous networks (RRC) signaling Resource configuration parameter.For example, base station is passed by radio resource control signaling to non-CoMP user equipment or CoMP user equipment The configuration parameter of the CSI-RS0 of defeated base station.Then the user equipment is after the CSI-RS0 resource configuration parameters are received, in CSI-RS0 The measurement of channel information is carried out in corresponding resource to the wireless channel between base station and the user equipment.
Step 2, base station by wireless heterogeneous networks (RRC) signal the user equipment (non-CoMP user equipment) need into The serial number information of the transfer point of row measurement.All transfer points in cell have a unique numbering, it is assumed that default list is little The upper limit of transfer point number is 32 in area, then the transfer point in cell is numbered can one by one from 0 to 31.For example, if base station is No. 0, First RRH is No. 1, and the 2nd RRH is No. 2.Then base station notifies that CoMP user equipment needs the transfer point for measuring by RRC signaling Serial number 0,1 and 2.And CoMP user equipment adopts the reference signaling sequence related to transfer point sequence number in the resource of public CSI-RS0 The upper transfer point respectively to needing measurement carries out channel measurement.Definition in reference standard document 3GPP TS 36.211, each The Initial Value definition of the CSI-RS reference signaling sequences in transfer point is Wherein ns is timeslot number, and l is the sequence number of OFDM symbol,For cell ID,For transfer point sequence number.In identical CSI-RS money On source, different transfer points can be distinguished to the channel between user equipment by different reference signaling sequences.
Step 3, feedback system of the user equipment according to corresponding to specific mode of operation is anti-to base station by up channel Feedback channel condition information.
Cooperative multicast system and its channel condition information reference signaling (CSI-RS) are strengthened by RRH set forth above Collocation method, CoMP user equipment and non-CoMP user equipment can be good at carrying out measurement and the feedback of CSI, be base station Resource Distribution and Schedule reliable foundation is provided, so as to improve the handling capacity of whole system.The method design is simple effectively, is The complexity of system design is low, meets the design requirement of real system and LTE-Advanced and its evolution system.
So far already in connection with preferred embodiment, invention has been described.It should be understood that those skilled in the art are not In the case of departing from the spirit and scope of the present invention, various other changes can be carried out, replace and add.Therefore, the present invention Scope be not limited to above-mentioned specific embodiment, and should be defined by the appended claims.

Claims (28)

1. a kind of RRH strengthens cooperative multicast system, and the system includes base station, one or more RRH, one or more CoMP User equipment or non-CoMP user equipment, base station and the RRH are used as the transfer point in cell, it is characterised in that：
Base station, for by channel of the broadcast channel to base station and each RRH in all this cells of user device transmissions of this cell State information references signaling CSI-RS configuration parameter, is passed by radio resource control RRC signaling to non-CoMP user equipment Public CSI-RS configuration parameter in defeated cell, notifies that CoMP user equipment needs the transmission of measurement by RRC signaling Point set；
The RRH, is attached by optical fiber with base station, and the data exchange of Large Copacity, two-forty is carried out between base station；
Non- CoMP user equipment, the public CSI-RS configuration parameter transmitted using base station is corresponding in the public CSI-RS Channel status measurement is carried out in resource, and by up channel to base station feedback measurement result；
CoMP user equipment, the CSI-RS configuration parameter of each transfer point for passing through broadcast channel transmission using base station, to passing Listed transfer point carries out channel status measurement in defeated point set, and by up channel to base station feedback measurement result.
2. system according to claim 1, it is characterised in that in cell the base station and each RRH transmit one it is public CSI-RS be used for non-CoMP user equipment and carry out the measurement of channel condition information, the base station in cell passes respectively with each RRH Defeated different CSI-RS carries out corresponding channel status measurement for CoMP user equipment.
3. system according to claim 2, it is characterised in that the public CSI-RS and the different CSI-RS tools There are different resource configuration parameters.
4. system according to claim 1, it is characterised in that the non-CoMP user equipment is by multiple transmission in cell The public CSI-RS of point transmitting carries out the measurement of channel status, and its measurement obtains channel status for multiple transmission point to non-CoMP The channel status of one combined channel of user equipment.
5. system according to claim 4, it is characterised in that the CoMP user equipment is different by what is received CSI-RS is measured respectively to the multiple transmission point of surrounding, obtains each transfer point to each channel between the user equipment Channel status.
6. system according to claim 5, it is characterised in that the non-CoMP user equipment is fixed in LTE-Advanced The measurement of channel condition information is carried out under the pattern 9 of justice.
7. the system according to any one of claim 1-6, the plurality of RRH does not possess single cell ID, sets with base station Standby public cell ID.
8. system according to claim 7, each in the plurality of RRH has and base station identical transmission power.
9. system according to claim 7, each in the plurality of RRH has less transmitting work(relative to base station Rate, the signal of base station can cover whole cell, including the scope that each RRH is covered.
10. a kind of RRH strengthens cooperative multicast system, the system include base station, one or more RRH, one or more CoMP user equipment or non-CoMP user equipment, base station and the RRH are used as the transfer point in cell, it is characterised in that：
Base station, by radio resource control RRC signaling to public in non-CoMP user or CoMP user device transmission this cell The resource configuration parameter of CSI-RS, and notify that CoMP user equipment needs the CSI-RS of the transfer point of measurement by RRC signaling Resource configuration parameter；
The RRH, is attached by optical fiber with base station, and the data exchange of Large Copacity, two-forty is carried out between base station；
Non- CoMP user equipment, using the public CSI-RS configuration parameter, in the corresponding resources of the public CSI-RS On carry out channel status measurement, and by up channel to base station feedback measurement result；
CoMP user equipment, the CSI-RS configuration ginseng of the transfer point of the needs measurement notified by RRC using base station Number, measures to the channel status of channel between each transfer point and the CoMP user equipment.
11. systems according to claim 10, it is characterised in that the base station and each RRH transmit a public affairs in cell Common CSI-RS is used for non-CoMP user equipment carries out the measurement of channel condition information, the base station in cell and each RRH difference The different CSI-RS of transmission carries out corresponding channel status measurement for CoMP user equipment.
12. systems according to claim 11, it is characterised in that the public CSI-RS and different CSI-RS With different resource configuration parameters.
13. systems according to claim 12, it is characterised in that the non-CoMP user equipment is by multiple biographies in cell The public CSI-RS of defeated point transmitting carries out the measurement of channel status, and it is multiple transmission point to non-that its measurement obtains channel status The channel status of one combined channel of CoMP user equipment.
14. systems according to claim 12, it is characterised in that the CoMP user equipment is different by what is received CSI-RS is measured respectively to the multiple transmission point of surrounding, obtains each transfer point to each channel between the user equipment Channel status.
15. systems according to claim 14, it is characterised in that the non-CoMP user equipment is in LTE-Advanced The measurement of channel condition information is carried out under the pattern 9 of definition.
16. systems according to any one of claim 10-15, it is characterised in that the plurality of RRH does not possess individually little Area ID, cell ID public with base station equipment.
17. systems according to claim 16, it is characterised in that each in the plurality of RRH has and base station phase Same transmission power.
18. systems according to claim 16, it is characterised in that each in the plurality of RRH has relative to base station The signal for having less transmission power, base station can cover whole cell, including the scope that each RRH is covered.
A kind of 19. RRH strengthen cooperative multicast systems, the system include base station, one or more RRH, one or more CoMP user equipment or non-CoMP user equipment, base station and the RRH are used as the transfer point in cell, it is characterised in that：
Base station, by radio resource control RRC signaling the money of CSI-RS public in non-CoMP user device transmission this cell is given Source configuration parameter, and the serial number information of the transfer point that the CoMP user equipment needs to measure is notified by RRC signaling, it is little All transfer points in area are each with a unique sequence number；
The RRH, is attached by optical fiber with base station, and the data exchange of Large Copacity, two-forty is carried out between base station；
Non- CoMP user equipment, using the public CSI-RS configuration parameter, in the corresponding resources of the public CSI-RS On carry out channel status measurement, and by up channel to base station feedback measurement result；
CoMP user equipment, it is right respectively in the resource of public CSI-RS using the reference signaling sequence related to transfer point sequence number Needing the transfer point of measurement carries out channel measurement.
20. systems according to claim 19, it is characterised in that the base station and each RRH transmit a public affairs in cell Common CSI-RS is used for non-CoMP user equipment carries out the measurement of channel condition information.
21. systems according to claim 20, it is characterised in that the non-CoMP user equipment is by multiple biographies in cell The public CSI-RS of defeated point transmitting carries out the measurement of channel status, and it is multiple transmission point to non-that its measurement obtains channel status The channel status of one combined channel of CoMP user equipment.
22. systems according to claim 21, it is characterised in that the non-CoMP user equipment is in LTE-Advanced The measurement of channel condition information is carried out under the pattern 9 of definition.
23. systems according to any one of claim 19-22, it is characterised in that the plurality of RRH does not possess individually little Area ID, cell ID public with base station equipment.
24. systems according to claim 23, it is characterised in that each in the plurality of RRH has and base station phase Same transmission power.
25. systems according to claim 23, it is characterised in that each in the plurality of RRH has relative to base station The signal for having less transmission power, base station can cover whole cell, including the scope that each RRH is covered.
A kind of 26. RRH strengthen the reference signaling collocation method in cooperative multicast system, and the method is applied to such as claim RRH described in 1-9 strengthens cooperative multicast system, and the method comprising the steps of：
Believed to the channel status of base station and each RRH in all this cells of user device transmissions of this cell by broadcast channel base station Breath reference signaling CSI-RS configuration parameter is little to non-CoMP user device transmission sheet by radio resource control RRC signaling CSI-RS configuration parameter public in area, notifies that CoMP user equipment needs the transmission point set of measurement by RRC signaling；
The public CSI-RS configuration parameter of non-CoMP user equipment utilization base station transmission, in the corresponding moneys of the public CSI-RS Channel status measurement is carried out on source, and by up channel to base station feedback measurement result；
The CSI-RS configuration parameter of each transfer point that CoMP user equipment utilization base station passes through broadcast channel transmission, to transmission Listed transfer point carries out channel status measurement in point set, and by up channel to base station feedback measurement result.
A kind of 27. RRH strengthen the reference signaling collocation method in cooperative multicast system, and the method is applied to such as claim RRH described in 10-18 strengthens cooperative multicast system, and the method comprising the steps of：
Base station gives the resource of CSI-RS public in non-CoMP user device transmission this cell by radio resource control RRC signaling Configuration parameter, and notify that CoMP user equipment needs the CSI-RS configuration parameter information of the transfer point of measurement by RRC signaling；
Public CSI-RS configuration parameter described in non-CoMP user equipment utilization, in the corresponding resources of the public CSI-RS Channel status measurement is carried out, and by up channel to base station feedback measurement result；
The CSI-RS configuration parameters letter of the transfer point of the needs measurement that CoMP user equipment utilization base station is notified by RRC Breath, measures to the channel status of channel between each transfer point and the CoMP user equipment.
A kind of 28. RRH strengthen the reference signaling collocation method in cooperative multicast system, and the method is applied to such as claim RRH described in 20-25 strengthens cooperative multicast system, and the method comprising the steps of：
Base station gives the resource of CSI-RS public in non-CoMP user device transmission this cell by radio resource control RRC signaling Configuration parameter, and the serial number information of the transfer point that the CoMP user equipment needs to measure, cell are notified by RRC signaling Interior all transfer points are each with a unique sequence number；
Public CSI-RS configuration parameter described in non-CoMP user equipment utilization, in the corresponding resources of the public CSI-RS Channel status measurement is carried out, and by up channel to base station feedback measurement result；
CoMP user equipment is right respectively in the resource of public CSI-RS using the reference signaling sequence related to transfer point sequence number Needing the transfer point of measurement carries out channel measurement.
CN201110058252.6A 2011-03-11 2011-03-11 Remote radio head (RRH) enhancing cooperation multipoint transmission system and channel state information-regenerator section (CSI-RS) configuration method thereof Expired - Fee Related CN102685797B (en)

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