CN102013952A - Method for acquiring channel state information, base station and user equipment - Google Patents

Abstract

The invention discloses a method for acquiring channel state information, a base station and user equipment. In the invention, CoMP (Coordinated Multi-Point) user equipment can adopt an SRS (Sounding Reference Signal) mode based on a service cell or an SRS mode based on CoMP. The base station detects uplink SRS transmitted by the user equipment and acquires the channel state information according to the detected SRS. Then, the base station performs resource scheduling together with other base stations on the basis of the channel state information required by the resource allocation, exchanges scheduling information and/or data required to be transmitted cooperatively after joint resource scheduling with other base stations and carries out the transmitting mode selection, power allocation and transmitter optimization together with the other base stations. Finally, the base station transmits data and/or signaling to the user equipment. The invention has the characteristics of simple structure, completion and high efficiency and is easy for realization.

Description

Channel state information acquisition method, base station and subscriber equipment

Technical field

The present invention relates to the wireless technology transmission field, be specifically related to a kind of acquisition methods, base station and subscriber equipment of the channel condition information based on detection reference signal (SRS).

Background technology

Because individual or mobile communication equipment have required to have the ability of broadband business such as multimedia service, game on line, video request program and mobile TV, wideer band system band, higher peak rate and better edge service quality have become an important need of following individual or mobile communication system.3GPP (3G (Third Generation) Moblie partner plan) tissue is devoted to the international organization of individual or mobile communication standard work just.The 3GPP tissue designs EUTRA (universal mobile telecommunications system of evolution and continental rise radio insert) and EUTRAN (the universal mobile telecommunications system net of evolution and continental rise radio access network) since the second half year in 2004, and this project is also referred to as LTE (Long Term Evolution) project.In April, 2008,3GPP is organized in the China Shenzhen meeting, begin to inquire into the standardization effort of the 4th generation (4G) cellular communication system, 3GPP tissue definition LTE-Advanced (LTE-A) is as the version that carries out evolution to following 4G version from present 3GPP LTE 8.0 versions for this reason.

System based on LTE-Advanced (LTE-A) version not only is required to have the ability of back compatible based on the system of LTE 8.0 (LTE) version, but also require to have the downstream data rate at higher cellular cell center and the downstream data rate of cell edge, therefore, the technological concept of a kind of " cooperative multipoint transmission/reception (CoMP, Coordinated Multi-point Transmission/Reception) " by name obtains extensive concern and support.Coordinate multipoint (CoMP) transmission is considered to provide high data rate, improves cell edge throughput and/or throughput of system in the LTE-A system a kind of instrument.The core concept of CoMP transmission is by a plurality of base station (BS, Base Station) between and a plurality of subscriber equipment (UE, User Equipment) cooperation between, not only reach the purpose of the data rate of the data rate that improves center of housing estate simultaneously and cell edge, and reach the purpose that greatly suppresses the co-channel interference that extensively exists between each wireless area.In addition, multi-input/output antenna (MIMO:Multiple Input Multiple Output) technology is as the main means that improve system transmissions speed, it can improve the capability of communication system and the availability of frequency spectrum exponentially under the situation that does not increase system bandwidth, therefore, about the MIMO technology will be the key technology that the third generation mobile communication system must adopt, and this viewpoint has been built consensus and has been subjected to paying close attention to widely.Moreover, OFDM (OFDM) technology has stronger anti-fading ability and higher frequency efficiency, and the high speed data transfer in suitable multi-path environment and the fading environment, therefore, with the MIMO-OFDM technology that MIMO technology and OFDM technology combine, become the core technology of next-generation mobile communications.In addition, because single carrier (SC, SingleCarrier) transmission technology has the lower characteristics of PAPR/CM (peak-to-average force ratio/cubic measure), and each communication common carrier is reached common understanding gradually and adopted DFT-S-OFDM (OFDM of discrete Fourier transform (DFT) expansion) with the up link of LTE or LTE-A is the uplink multi-address technology of the frequency domain SC-FDMA (single carrier-frequency division multiple access) of core.At last, in order further significantly to improve the performance of LTE-A system, 3GPP has just determined that in the RAN1#53bis meeting downlink bandwidth of LTE-A system will adopt spectrum aggregation (Carrier Aggregation) technology, use system bandwidth or the up system bandwidth greater than 20MHz of the synthetic descending 100MHz of groups of frequency bands of continuous or discrete a plurality of 20MHz, this has also produced influence to the CoMP scheme.

The present invention is by investigation and analysis to the prior art document, discovery is at cellular system, there is channel condition information (CSI, Channel State Information) acquisition methods and uplink detection reference signal (UL SRS, Uplink Sounding Reference Signal) method for designing is as follows:

(1) feedback mechanism of CoMP system

The feedback mechanism of CoMP system is divided into three kinds of modes: 1) clear and definite CSI feedback promptly receives function and observes channel and do not need to carry out any transmission processing or reception processing; 2) indeterminate CSI feedback, promptly receive function and observe the channel of handling or receiving processing through sending, as channel quality indication (CQI, Channel Quality Indicator), pre-coding matrix indication (PMI, PrecodingMatrix Indicator), order indication (RI, Rank Indicator); 3) UE sends SRS, and promptly BS is by SRS and utilize the reciprocity of up-downgoing channel to estimate downlink channel condition information (DLCSI).Referring to document: 3GPP LTE technical report TR 36.814V.1.2.1,3GPP, 3GPPTSG-RAN WG1#57bis, Los Angeles, CA USA, June 29-July 3,2009.But the document does not provide BS how by SRS and utilize the reciprocity of up-downgoing channel to estimate the concrete mechanism of DL CSI.

(2) the SRS scheme of CoMP system

Some companies propose to use the SRS of LTE 8.0 versions in the CoMP system, and utilize the cooperation of minizone to improve the performance of SRS.Referring to document: 3GPP LTE motion R1-092776, CATT, Potevio, " Analysis of SRS scheme for CoMP ", 3GPP TSG RAN WG1meeting#57bis, Los Angeles, USA, 29June-3July, 2009.But the SRS that this scheme proposes is based on the SRS of different districts, and does not carry out co-design between the SRS of different districts, and therefore, cooperating with each other of SRS do not reach best between the CoMP system cell.

(3) based on the CSI statistical information of channel reciprocity

Some motions propose to come the CSI statistical information of estimating down-ward link by the wave beam angle of arrival (DOA, the Direction ofArrival) information of using up link, as the space channel covariance matrix.Referring to document: 3GPP LTE motion R1-092737, Ericsson, ST-Ericsson, " On CSIfeedback for IMT-Advanced fulfilling CoMP schemes ", 3GPP TSG RANWG1 meeting #57bis, Los Angeles, USA, 29June-3July, 2009.But this method is used and the identical SRS of LTE 8.0 versions, does not adopt special SRS method at the CoMP system, and therefore, the SRS method can not embody the advantage of CoMP system better.

(4) based on the feedback capacity analysis of different feedback methods

Some motion thinks that the feedback mechanism of LTE 8.0 versions can not support the needed higher feedback capacity of LTE-A, therefore, following motion has proposed based on the feedback method of PUCCH (Physical Uplink Control Channel), based on the feedback method of PUSCH (Physical Uplink Shared Channel), based on the feedback method of SRS, and analyzed feedback capacity separately, wherein about the feedback method based on SRS, following motion is thought and can be adopted a plurality of SC-FDMA symbols to be used for the transmission of uplink SRS.Referring to document: 3GPP LTE motion R1-092366, Huawei, " Feedback capacity analysisfor different feedback mechanisms ", 3GPP TSG RAN WG1 meeting#57bis, Los Angeles, USA, 29June-3July, 2009.But this motion does not further provide problem how to utilize a plurality of SC-FDMA symbols to solve the SRS compatibility of LTE 8.0 systems and LTE-A system.

(5) antenna verification of TDD CoMP system

This method is measured by the SRS to up link, and comes TDD (time division multiplexing) CoMP system is carried out antenna verification according to measurement result, to estimate the CSI of accurate down link.Referring to document: 3GPP LTE motion R1-092659, Samsung, " Antenna calibrationsfor TDD CoMP ", 3GPP TSG RAN WG1 meeting#57bis, Los Angeles, USA, 29June-3July, 2009.But the document does not provide the scheme of how using SRS that FDD (frequency division multiplexing) CoMP system is carried out antenna verification and estimating accurate CSI.

In view of at present existing in the world not comprehensive or concrete based on the CSI acquisition methods of SRS at the LTE-A system, therefore, be necessary to seek a kind of comprehensive, efficient and simple and practical CSI acquisition methods, base station and subscriber equipment based on SRS, thus be used for the LTE-A system and following the 4th generation cell mobile communication systems or other communication systems.

Summary of the invention

As mentioned above, 3GPP LTE-A determine to have supported the CoMP technology and has attempted to introduce the technology of obtaining CSI based on SRS and channel reciprocity, consider that prior art (for example, related motion in the above background technology part) CSI that proposes feeds back/obtains the deficiency of technology and SRS design, detection method, the object of the present invention is to provide a kind of CSI acquisition methods, base station and subscriber equipment based on SRS.By adopt new SRS design, detection method to obtain more accurate CSI information at the CoMP system, than traditional method, the method and system that the present invention proposes has comprehensively, characteristics efficient and simple, that be easy to realize.

According to first scheme of the present invention, a kind of channel state information acquisition method has been proposed, comprise the steps: to detect the detection reference signal SRS that subscriber equipment sends; According to detected SRS, obtain channel condition information; Based on the required channel condition information of resource allocation, carry out the federated resource scheduling with other base stations; With schedule information after the scheduling of other base station exchange federated resources and/or need the data of cooperation transmission; Carry out sending mode selection, power division and transmitter optimization with other base stations; And send data and/or signaling to subscriber equipment.

Preferably, when described subscriber equipment was cooperative multipoint transmission/reception CoMP subscriber equipment, the CoMP subscriber equipment adopted and sends SRS based on CoMP.

Preferably, adopt one or more symbols to place the SRS that has only the LTE-A subscriber equipment to detect in the subframe of the up link of CoMP subscriber equipment, described one or more symbols are placed on the 7th symbol place and/or the 13rd symbol place of subframe.

Preferably, the non-CoMP subscriber equipment of CoMP subscriber equipment and LTE-A comes multiplexing SRS in code division multiplexing CDM mode.

Preferably, the LTE-A subscriber equipment SRS that can detect is used for whole CoMP subscriber equipmenies.

Preferably, the SRS that sends of described subscriber equipment is placed in the CoMP frequency range of up link of serving BS and/or cooperative base station.

Preferably, have mapping relations one to one between the carrier wave frequency range of the CoMP frequency range of the up link of serving BS and/or cooperative base station and down link.

Preferably, when described subscriber equipment was cooperative multipoint transmission/reception CoMP subscriber equipment, serving BS and cooperative base station all detected the SRS that the CoMP subscriber equipment sends.

Preferably, when described subscriber equipment was cooperative multipoint transmission/reception CoMP subscriber equipment, serving BS and cooperative base station all according to the detected SRS that is sent by the CoMP subscriber equipment, were obtained channel condition information.

Preferably, when adopting the CoMP transmission means, serving BS and cooperative base station exchange background information, background information comprises at least one in the following information: the bandwidth of the channel condition information that is obtained, the dynamic-configuration of SRS or semi-static configuration, SRS, the transmission cycle of SRS, transmission duration, number of repetition, transmitting power, residing subframe, frequency spectrum comb, the cyclic shift of sequence, sequence numbering.

Preferably, the required channel condition information of resource allocation comprises at least one item in the following information:

The down link of the subscriber equipment of-serving BS and Serving cell and/or uplink channel state characteristic information,

The down link of the subscriber equipment of-serving BS and non-service cell and/or uplink channel state characteristic information,

The down link of the subscriber equipment of-cooperative base station and Serving cell and/or uplink channel state characteristic information, and

The down link of the subscriber equipment of-cooperative base station and non-service cell and/or uplink channel state characteristic information.

According to alternative plan of the present invention, a kind of base station has been proposed, comprising: Transmit-Receive Unit receives data and/or signaling from subscriber equipment or adjacent base station, and sends data and/or signaling to subscriber equipment; Detection reference signal SRS measuring unit detects the SRS signal that is sent by subscriber equipment from Transmit-Receive Unit; The channel condition information acquiring unit according to the SRS signal from the SRS measuring unit, is estimated or is calculated the channel status characteristic information; The collaboration mode judging unit judges according to the channel status characteristic information that obtains whether subscriber equipment enters collaboration mode; The scheduling of resource unit, according to the channel status characteristic information of other base station exchange, carry out the federated resource scheduling with other base stations, and with other base station specified data sending modes and/or need the data of cooperation transmission; And power division and optimization unit, the data that need cooperation transmission are carried out power division, and carry out transmitter optimization and handle.

Preferably, described Transmit-Receive Unit detects the SRS by cooperative multipoint transmission/reception CoMP subscriber equipment sends.

Preferably, described CoMP subscriber equipment is the CoMP subscriber equipment that is positioned at the Serving cell of described base station, or is positioned at the CoMP subscriber equipment of Serving cell of the cooperative base station of described base station.

Preferably, described channel condition information processing unit is estimated or the channel status characteristic information that calculates comprises in the following information at least one:

The down link of the subscriber equipment of-serving BS and Serving cell and/or uplink channel state characteristic information,

The down link of the subscriber equipment of-serving BS and non-service cell and/or uplink channel state characteristic information,

The down link of the subscriber equipment of-cooperative base station and Serving cell and/or uplink channel state characteristic information, and

The down link of the subscriber equipment of-cooperative base station and non-service cell and/or uplink channel state characteristic information.

Preferably, described collaboration mode judging unit also according to the channel condition information of the Serving cell of measuring, judges whether subscriber equipment enters collaboration mode.

Preferably, described scheduling of resource unit carries out the federated resource scheduling to downlink resource.

Preferably, described scheduling of resource unit carries out the federated resource scheduling to ascending resource, and described Transmit-Receive Unit is sent to described subscriber equipment with described schedule information, at described subscriber equipment according to described schedule information, after data are sent to described base station and described other base stations respectively, the data that send by described subscriber equipment that described base station and described other base station exchange are received.

Preferably, described base station also comprises: data processing unit merges processing to the data that obtain with exchange, that sent by described subscriber equipment that receive.

According to third party's case of the present invention, a kind of subscriber equipment has been proposed, comprising: Transmit-Receive Unit receives from the data of base station and/or signaling with to the base station and sends data and/or signaling; The schedule information acquiring unit, obtain cooperative information from the data that receive, described cooperative information comprises at least one in the following information: serving BS indication subscriber equipment enters the information of collaboration mode and the schedule information after serving BS and the scheduling of cooperative base station federated resource; The transmitter optimization unit is optimized according to the transmitter of cooperative information to up link, and the data that will send after will optimizing send to serving BS and cooperative base station respectively via described Transmit-Receive Unit; And detection reference signal SRS transmitting element, send SRS to serving BS and cooperative base station.

Preferably, when described subscriber equipment was in cooperative multipoint transmission/reception CoMP pattern, described SRS transmitting element sent SRS based on CoMP to serving BS and cooperative base station.

Preferably, described subscriber equipment also comprises: data processing unit, get access to serving BS indication subscriber equipment when entering the information of down collaboration pattern at described schedule information acquiring unit,, the data from serving BS and/or cooperative base station are merged processing according to schedule information; And get access to serving BS indication subscriber equipment at described schedule information acquiring unit and enter under the information of uplink coordinated pattern, the corresponding transmitter optimization process is carried out in indication transmitter optimization unit.

Preferably, described data processing unit also is used for the obtaining communication environmental information, and feeding back to the base station via described Transmit-Receive Unit, described communication environment information comprises at least one in the following information: the channel status characteristic information and the neighbor cell interference information of reflection channel status characteristic.

According to cubic case of the present invention, a kind of channel state information acquisition method has been proposed, comprise the steps: that serving BS and cooperative base station detect the detection reference signal SRS that subscriber equipment sends; Serving BS and cooperative base station are obtained channel condition information according to detected SRS; Serving BS and cooperative base station are based on the required channel condition information of resource allocation, and the collaborative federated resource that carries out is dispatched; Schedule information after serving BS and the scheduling of cooperative base station exchange federated resource; Schedule information after the federated resource that subscriber equipment sends over according to serving BS is dispatched is carried out transmitter optimization; And subscriber equipment sends data and/or signaling to serving BS and/or cooperative base station.

According to a specific embodiment of the present invention, a kind of CSI acquisition methods based on SRS is provided, may further comprise the steps: for the subscriber equipment that enters the CoMP pattern in the Serving cell, serving BS and cooperative base station detect SRS information respectively, SRS information comprises that at least the reflection subscriber equipment mails to the SRS of serving BS and the SRS that subscriber equipment mails to cooperative base station, serving BS and cooperative base station estimate corresponding channel condition information (CSI) according to detected SRS information respectively, serving BS and cooperative base station exchange CSI, the CSI according to exchange carries out the federated resource scheduling again; And the schedule information after the scheduling of serving BS and cooperative base station exchange federated resource, and carry out the collaboration data transmission according to schedule information.

According to another specific embodiment of the present invention, a kind of base station that is used to realize above-mentioned CSI acquisition methods based on SRS is provided, and it comprises Transmit-Receive Unit, SRS measuring unit, CSI acquiring unit, data processing unit, collaboration mode judging unit, crosspoint, scheduling of resource unit, power division and optimization unit.Transmit-Receive Unit receives and sends data and signaling.The SRS that the SRS measuring unit is sent Transmit-Receive Unit detects.The SRS that the CSI acquiring unit detects according to the SRS measuring unit obtains the channel condition information of down channel and/or up channel.Data processing unit is handled the data that receive.The channel condition information that the collaboration mode judging unit is sent according to the CSI acquiring unit judges whether subscriber equipment enters the CoMP pattern.Crosspoint is used for a plurality of base stations and intercourses background information, and crosspoint can use the schedule information after the scheduling of X2 interface exchange federated resource, the CSI information that different base station obtains, the collaboration mode of a plurality of base stations etc.The scheduling of resource unit is used for scheduling of resource or the scheduling of the federated resource between a plurality of base station that this service area is carried out in the base station.Power division with optimize the unit data of needs transmission carried out power division, transmitter is optimized processing (comprise aerial angle to transmitter, antenna number, transmitted power etc. adjust).

According to another specific embodiment of the present invention, a kind of subscriber equipment that is used to realize above-mentioned CSI acquisition methods based on SRS is provided, it comprises Transmit-Receive Unit, data processing unit, schedule information acquiring unit, transmitter optimization unit and SRS transmitting element.Transmit-Receive Unit receives and sends data and signaling.Data processing unit is handled the data that receive.Obtain resource allocation information and cooperative information the data of schedule information acquiring unit after handling.The transmitter optimization unit is optimized the transmitter of up link, comprises up sending mode selection, power division, Bit Allocation in Discrete, feedback system selection etc.The SRS transmitting element sends the uplink SRS signal to serving BS and cooperative base station.

Thus, a kind of CSI acquisition methods, base station and subscriber equipment that the present invention proposes based on SRS, comprise that user device configuration SRS, SRS send, SRS is detected in the base station, the base station obtains contents such as CSI, scheduling of resource, have the efficient height, applied widely, be easy to advantage such as realization.

Description of drawings

From the detailed description below in conjunction with accompanying drawing, above-mentioned feature and advantage of the present invention will be more obvious, wherein:

Fig. 1 shows the schematic diagram according to multi-base station cooperative network of the present invention;

Fig. 2 shows the schematic diagram of the SRS position of LTE 8.0 version subscriber equipmenies;

Fig. 3 shows the schematic diagram of the descending CoMP system feedback of LTE-A mechanism;

Fig. 4 shows the schematic diagram that the CSI based on SRS obtains;

Fig. 5 shows the schematic diagram that DOA measures;

Fig. 6 shows the schematic diagram that the SRS sequence produces cross-correlation interference;

Fig. 7 shows the schematic diagram of main application scenarios of the present invention;

Fig. 8 show according in the descending CoMP-CB system of first embodiment of the invention based on the schematic diagram of the CSI acquisition methods of sub-district SRS;

Fig. 9 show according in the descending CoMP-CB system of first embodiment of the invention based on the flow chart of the CSI acquisition methods of sub-district SRS;

Figure 10 show according among the descending CoMP-MU-MIMO of second embodiment of the invention based on the schematic diagram of the CSI acquisition methods of the SRS of CoMP;

Figure 11 show according among the descending CoMP-MU-MIMO of second embodiment of the invention based on the flow chart of the CSI acquisition methods of the SRS of CoMP;

Figure 12 shows the schematic diagram based on the SRS design of CoMP;

Figure 13 shows the schematic diagram based on the SRS Variant Design of CoMP;

Figure 14 shows the schematic diagram based on another Variant Design of SRS of CoMP;

Figure 15 shows the schematic diagram of the division of CoMP frequency range;

Figure 16 shows the schematic diagram based on the upstream and downstream symmetrical frequency band of CoMP;

Figure 17 show according among the up CoMP-MU-MIMO of third embodiment of the invention based on the schematic diagram of the CSI acquisition methods of the SRS of CoMP Set;

Figure 18 show according among the up CoMP-MU-MIMO of third embodiment of the invention based on the flow chart of the CSI acquisition methods of the SRS of CoMP Set;

Figure 19 shows the schematic diagram based on another Variant Design of SRS of CoMP;

Figure 20 show according among the descending CoMP-SU-MIMO of fourth embodiment of the invention based on the schematic diagram of the CSI acquisition methods of the SRS of CoMP Set;

Figure 21 show according among the descending CoMP-SU-MIMO of fourth embodiment of the invention based on the flow chart of the CSI acquisition methods of the SRS of CoMP Set;

Figure 22 shows the schematic diagram according to base station of the present invention; And

Figure 23 shows the schematic diagram according to subscriber equipment of the present invention.

Embodiment

To a preferred embodiment of the present invention will be described in detail, having omitted in the description process is unnecessary details and function for the present invention with reference to the accompanying drawings, obscures to prevent that the understanding of the present invention from causing.At length set forth performing step of the present invention for clear, provide some specific embodiments of the invention below, be applicable to the LTE cellular communication system.Need to prove, the invention is not restricted to the application described in the embodiment, but applicable to other wireless communication systems.

Fig. 1 shows the schematic diagram according to multi-base station cooperative network of the present invention.Cellular system is divided into a plurality of wireless coverage areas that join, i.e. sub-district to service coverage area.In Fig. 1, the sub-district schematically is depicted as regular hexagon, and whole coverage is spliced by the Serving cell of base station BS 100～BS103.In the LTE system, three node layer network configurations of base station, wireless network control unit and core net are simplified to the two-layer node structure.Wherein, the function of wireless network control unit is divided into the base station, the base station is coordinated by the wireline interface of " X2 " by name with the base station and is communicated by letter, as shown in Figure 1, base station BS 100～BS103 is connected with each other by X2 interface, exchange background information by central controller C-100 between the X2 interface, this is known in the field.In Fig. 1, base station BS 100～BS103 schematically is depicted as a certain zone that is positioned at the sub-district, and is equipped with omnidirectional antenna.But in the cell layout of cellular communication system, base station BS 100～BS103 can be equipped with directional antenna, and the subregion of direction ground coverage cell is arranged, and this subregion is commonly called the sector.Therefore, the expression of multi cell cellular communication system shown in Figure 1 only is for illustrative purpose, and does not mean that the present invention needs above-mentioned restrictive specified conditions in the enforcement of cellular system.In Fig. 1, several user equipment (UE)s 100～UE108 is distributing in the sub-district at BS100～BS103 place.Each of user equipment (UE) 100～UE108 comprises a transmitter, a receiver and a portable terminal control unit, and this is known in the present technique field.Concerning any one subscriber equipment, the base station is divided into two types, i.e. serving BS and non-serving base stations: the direct serving BS that provides the base station of communication service to be called as this subscriber equipment for subscriber equipment is BS100 as the serving BS of UE100 and UE101; Other base stations are called as the non-serving base stations of this subscriber equipment, and non-serving base stations can be used as the cooperation base station of serving BS, together for the user provides communication service, are BS101～BS103 as the non-serving base stations of UE100 and UE101.Because CoMP transmission plan (referring to 3GPP standardized technique report 3GPP TR 36.814) is adopted in the decision of LTE-A system, therefore, two groups of CoMP transmission modes have been represented among Fig. 1: one, the joint transmission pattern, as shown in Figure 1, BS100, BS101, BS103 send downlink data to UE100 simultaneously, thereby improve the quality of reception or downlink data throughput that the UE100 termination is collected mail number; They are two years old, the cooperative scheduling pattern, BS101, BS102, BS103 carry out scheduling of resource mutually in phase, UE104, UE105, UE107 in coverage separately sends downlink data respectively again, thereby reach the purpose of cochannel interference eliminated/coordination (ICIC, Inter-Cell Interface Cancellation/Coordination).Therefore, in the LTE-A system, subscriber equipment can be according to whether the CoMP participating transmission is divided into two classes, i.e. CoMP subscriber equipment (CoMP UE) and non-CoMP subscriber equipment (Non-CoMP UE).UE100 among Fig. 1, UE104, UE105, UE107 are CoMP UE, and UE101, UE102, UE103, UE106, UE108 are Non-CoMP UE.Each CoMP subscriber equipment all has serving BS and cooperative base station, is BS100 as the serving BS of UE100, and the cooperative base station of UE100 is BS101 and BS103, and the serving BS of UE104 is BS101, and the cooperative base station of UE104 is BS102 and BS103.

Fig. 2 shows the schematic diagram of the SRS position of LTE 8.0 version subscriber equipmenies.In LTE 8.0 versions, through participating in the long-term discussion of each company of standardization body, to determine SRS is placed in last symbol of a subframe, the frequency domain interval of SRS is two equivalent subcarriers, the time-frequency structure of SRS is as shown in Figure 2.

Fig. 3 shows the schematic diagram of the descending CoMP system feedback of LTE-A mechanism.At user equipment (UE) 200, Fig. 3 has adopted the descending CoMP transmission plan based on Single User MIMO (SU-MIMO), UE200 adopts indeterminate CSI feedback mechanism, information such as CQI, the PMI that to be UE200 handle through receiver to serving BS BS200 feedback by up link at Serving cell, RI, comprise CQI, PMI, the RI of serving BS BS200 to the down link of UE200, with CQI, PMI, the RI of cooperative base station BS201 to the down link of UE200, and cooperative base station BS202 is to CQI, PMI, the RI of the down link of UE200; At user equipment (UE) 201, U202, UE203, Fig. 3 adopts the descending CoMP transmission plan based on multiuser MIMO (MU-MIMO), UE202 adopts clear and definite CSI feedback mechanism, be that UE202 feeds back CSI information by up link to serving BS BS201 at Serving cell, CSI, the cooperative base station BS202 that institute's process link is disturbed in descending to descending CSI, the cooperative base station BS200 of UE202 to UE202 as serving BS BS201 to the descending interference of UE202 the CSI of process link, be H (BS201, BS200, BS202).In addition, because UE201, UE202, UE203 is in the pattern of CoMP-MU-MIMO, therefore, UE201, UE202, UE203 need know the descending CSI information of Serving cell separately and the CSI information of the link that adjacent area interference is passed through that is subjected to separately, to support switching between the different CoMP patterns or the switching between CoMP and the non-CoMP pattern, thereby guarantee the performance of CoMP-MU-MIMO system, as list of references R1-09xxxx (Qualcomm Europe, " CoMP email summary ", 3GPP TSGRAN WG1meeting#57bis, Los Angeles, USA, 29June-3July, 2009) the middle description: CoMP transmission mode or non-CoMP transmission mode are concerning subscriber equipment, be " transparent ", promptly subscriber equipment does not need to know oneself whether to be in the pattern of CoMP or non-CoMP; LTE-A should support switching between the different CoMP patterns or the switching between CoMP and the non-CoMP pattern.

Fig. 4 shows the schematic diagram that the CSI based on SRS obtains.LTE-A supports UE to send the mechanism of SRS in TR 36.814V.1.2.1 technical report, and promptly BS is by detecting SRS and utilizing the reciprocity of up-downgoing channel to estimate downlink channel condition information (DL CSI).Especially in the TDD system, up channel and down channel exist tangible reciprocity, and promptly the up channel state information can be thought identical or approximate with downlink channel condition information and can replace mutually.Therefore, at (the CoMP-CB that is shaped based on cooperative beam, CoMP Coordinated Beam-forming) in the transmission mode, can adopt UE to send the mechanism of SRS fully, BS estimates according to the SRS that detects or calculates descending CSI, thereby reduce even cancel the feedback overhead of up link CSI greatly, as list of references R1-092737 (Ericsson, ST-Ericsson, " On CSI feedback forIMT-Advanced fulfilling CoMP schemes ", 3GPP TSG RAN WG1 meeting#57bis, Los Angeles, USA, 29June-3July, 2009), the document proposes by using the wave beam angle of arrival (DOA of up link, Direction of Arrival) information is come the CSI statistical information of estimating down-ward link, as the space channel covariance matrix.Although can realize the acquisition methods of the CSI of list of references R1-092737 on theoretical and the engineering, but must see, also there are some significant disadvantages in the mechanism of obtaining CSI based on UE transmission SRS: the preferably unified linear array (ULA of transmitting antenna, Uniform Line Array), the DOA that measures like this is just accurate; (for example, the covariance of channel) variation is too slow, can not reflect the variation of channel instantaneously, and therefore, the CSI of channel status statistical information reflection is a kind of CSI of long-term statistical significance for the channel status statistical information of measuring based on DOA; In the FDD system, must be controlled at the evaluated error of the channel statistical information of up link and down link in certain scope, the CSI of the statistical significance that estimates like this is just accurate, therefore, realizes that in the FDD system difficulty that channel statistical information is estimated will increase.

Fig. 5 shows the schematic diagram that DOA measures.8 reception antennas of 4 transmitting antennas of UE end and BS end all become unified linear array (ULA) modes of emplacement equably, distance between the antenna is less than or equal to carrier wavelength half, the BS end can be measured the DOA information that UE holds the SRS that sends out exactly, then the BS end can accurately estimate the covariance information of the space channel of down link according to the DOA information of up link, can be referring to list of references R1-092737.The covariance matrix of the down channel of BS end can be expressed as formula (1),

$R=\underset{\mathrm{\θ}}{\∫}p\left(\mathrm{\θ}\right)a\left(\mathrm{\θ}\right)a^H\left(\mathrm{\θ}\right)\mathrm{d\θ}---\left(1\right)$

Wherein, p (θ) is the radiation power spectrum density on the DOA direction θ, and a (θ) is an antenna-array response.To a ULA aerial array, because antenna is isotropic, antenna-array response can be expressed as formula (2) on direction θ,

$a\left(\mathrm{\θ}\right)=\left[\begin{array}{c}1\\ e^{-j2\mathrm{\π}\frac{d}{\mathrm{\λ}}\sin \left(\mathrm{\θ}\right)}\\ .\\ .\\ .\\ e^{-j2\mathrm{\π}\frac{d}{\mathrm{\λ}}(N-1)\sin \left(\mathrm{\θ}\right)}\end{array}\right]---\left(2\right)$

Wherein, d=Δ X is the spacing between antenna, and λ is a carrier wavelength, and N is the antenna number.According to formula (2), so, descending and uplink antenna array response can be expressed as formula (3) and (4),

$a_{\mathrm{DL}}\left(\mathrm{\θ}\right)=\left[\begin{array}{c}1\\ e^{-j2\mathrm{\π\γ}\frac{f_{\mathrm{DL}}}{f_0}\sin \left(\mathrm{\θ}\right)}\\ .\\ .\\ .\\ e^{-j2\mathrm{\π\γ}\frac{f_{\mathrm{DL}}}{f_0}(N-1)\sin \left(\mathrm{\θ}\right)}\end{array}\right]---\left(3\right)$

$a_{\mathrm{UL}}\left(\mathrm{\θ}\right)=\left[\begin{array}{c}1\\ e^{-j2\mathrm{\π\γ}\frac{f_{\mathrm{UL}}}{f_0}\sin \left(\mathrm{\θ}\right)}\\ .\\ .\\ .\\ e^{-j2\mathrm{\π\γ}\frac{f_{\mathrm{UL}}}{f_0}(N-1)\sin \left(\mathrm{\θ}\right)}\end{array}\right]---\left(4\right)$

Wherein, f _DLAnd f _ULBe respectively uplink carrier frequency and downlink carrier frequency, f ₀Be centre frequency, the γ in formula (3) and (4) is respectively downstream frequency f _DLWith upstream frequency f _ULPairing wavelength.If multiplex distance is little, promptly | f _DL-f _UL| value little, so, can obtain formula (5) and formula (6),

p _DL(θ)≈p _UL(θ)≈p(θ) (5)

R _DL≈R _UL (6)

If multiplex distance is big, promptly | f _DL-f _UL| value big, so, can obtain formula (7), (8), (9),

a _DL(θ)＝T(θ)a _UL(θ) (7)

${\hat{R}}_{\mathrm{DL}}\left(\mathrm{\θ}\right)=T\left({\mathrm{\θ}}_{\mathrm{Max}}\right)R_{\mathrm{UL}}{T}^H\left({\mathrm{\θ}}_{\mathrm{Max}}\right)---\left(9\right)$

Here, the diagonal angle transmission matrix T (θ) by as shown in Equation (8) can obtain the relation between down channel and the up channel.Therefore, as shown in Equation (9), can obtain to obtain the covariance matrix of down channel by the covariance matrix of up channel.Therefore, consider the characteristics of TDD system and FDD system, formula (8) more is applicable to the TDD system, and formula (9) more is applicable to the FDD system.

Fig. 6 shows the SRS sequence and produces the schematic diagram about disturbing mutually.In descending CoMP system, if adopt the existing uplink SRS of LTE 8.0 versions, as shown in Figure 6, UE400 is to the SRS of serving BS BS400 transmission based on Serving cell, and UE401, UE402, UE403 are to the SRS of serving BS BS401 transmission based on Serving cell, so, because the residing sequence set difference of different service cells, different sequences can be overlapping in SRS sequence length difference in the same sequence set and the different sequence set, can produce cross-correlation interference in uplink SRS, as shown in Equation (10).

$R_{\mathrm{cross}}=|\frac{1}{N}\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{a}_i\·b_i|---\left(10\right)$

Wherein, { a ₁, a ₂..., a _NAnd { b ₁, b ₂..., b _NBe that length is identical but produce the SRS sequence of mutual interference among Fig. 6.These cross-correlation interference can cause making the accuracy of detection of uplink SRS to descend, and the decline of SRS accuracy of detection can directly cause the decline of descending CSI estimated accuracy, thereby cause dispatching algorithm performance decrease and CoMP performance decrease indirectly.In up CoMP system, because the CSI of up channel directly obtains by detecting uplink SRS 1, therefore, also exist similar uplink SRS sequence can produce the problem of cross-correlation interference, referring to list of references R1-092367 (Huawei, " Interference analysis on SRS for CoMP ", 3GPP TSG RAN WG1 meeting#57bis, Los Angeles, USA, 29June-3July, 2009).

Fig. 7 shows the schematic diagram of main application scenarios of the present invention.The SRS that considers LTE 8.0 versions designs at the sub-district, be that the base station of this sub-district does not need to detect the SRS that the subscriber equipment of other sub-districts sends, and cooperate in the LTE-A system because between the base station of a plurality of sub-districts of the introducing of CoMP technology needs and the subscriber equipment, therefore, the present invention attempts to introduce the thought that multi-BS (base station) multi-user equipment cooperates with each other in links such as the SRS of LTE-A system design, detection, CSI estimation, comprises the following aspects:

One defined the ability that a base station has the uplink SRS that the CoMP UE that detects other sub-districts sends, and this base station can utilize this SRS to estimate the CSI of this base station to CoMP UE;

Its two, at CoMP UE, independent design separately is based on the uplink SRS of CoMP set (CoMP Set);

Its three, propose to utilize SRS based on LTE-A to distinguish SRS based on CoMP;

Its four, propose concrete symbol and be used to design SRS based on CoMP;

Its five, propose to be limited in the CoMP frequency range based on the obtaining of CSI of SRS, should take the mapping relations of fixing between descending CoMP frequency range and the uplink SRS frequency range, to reduce the complexity that SRS detects.

[first embodiment]

Fig. 8 shows descending CoMP cooperative beam according to first embodiment of the invention and is shaped in (CoMP-CB) transmission system based on the schematic diagram of the CSI acquisition methods of sub-district SRS.As shown in Figure 8, base station BS 600, BS601, BS602 is respectively user equipment (UE) 600, UE601, the serving BS of UE602, base station BS 601, BS602 is the cooperative base station of user equipment (UE) 600, base station BS 600, BS602 is the cooperative base station of user equipment (UE) 601, base station BS 600, BS601 is the cooperative base station of user equipment (UE) 602, three base station BSs 600, BS601, BS602 is by the cooperation between the wave beam, respectively to three user equipment (UE)s 600, UE601, UE602 sends data, thereby constitute descending CoMP cooperative beam shaping (CB, Coordinated Beam-forming) transmission plan, to reach the data throughout that improves the wireless area edge or to suppress the purpose that cochannel disturbs (ICI, Inter-Cell Interference).As shown in Figure 8, in the present embodiment, the SRS information that three user equipment (UE)s 600, UE601, UE602 send not only can be detected by serving BS BS600, BS601, BS602 separately, also can be detected by cooperative base station separately, serving BS and cooperative base station estimate descending CSI according to detected SRS.Fig. 9 show according in the descending CoMP-CB system of first embodiment of the invention based on the flow chart of the CSI acquisition methods of sub-district SRS, the implementation step of first embodiment is described in detail.

At step S100, subscriber equipment sends SRS to serving BS;

Described user equipment (UE) 600, UE601, UE602 send uplink SRS to separately serving BS BS600, BS601, BS602 respectively, be each other at separately Serving cell and independent design between the uplink SRS three that user equipment (UE) 600, UE601, UE602 send separately, it is the SRS of the UE600 sub-district that is based on the BS600 place, the SRS of UE601 is based on the sub-district at BS601 place, the SRS of UE602 is based on the sub-district at BS602 place, as shown in Equation (11)

$r_{u,v}^{\left(\mathrm{\&alpha;}\right)}\left(n\right)=e^{\mathrm{j\&alpha;n}}{\stackrel{\&OverBar;}{r}}_{u,v}\left(n\right),$ $0\&le;n<M_{\mathrm{sc}}^{\mathrm{RS}}---\left(11\right)$

Wherein,

Be reference signal sequence length and Referring to 3GPP standardization report 3GPP TS 36.211.A plurality of reference signal sequences are defined as being taken from an independent basic sequence, and a plurality of reference signal sequences are distinguished by different α.The basis sequence is divided into different groups, u ∈ 0,1 ..., and 29} is the numbering of group, v is the numbering of a basic sequence in the group, referring to 3GPP standardization report 3GPP TS 36.211, at each time slot n _sGroup # u can represent frequency-hopping mode f in groups _Gh(n _s) and sequence shift mode f _Ss(n _s), as formula (12),

u＝(f _gh(n _s)+f _ss(n _s))mod30 (12)

Here, group frequency-hopping mode f _Gh(n _s) and sequence shift mode f _Ss(n _s) satisfy formula (13) and (14) respectively,

$f_{\mathrm{ss}}^{\mathrm{PUCCH}}=N_{\mathrm{ID}}^{\mathrm{cell}}\mathrm{mod}30---\left(14\right)$

In formula (13), pseudo random sequence c (i) can carry out initialization in each radio frames as formula (15),

$c_{\mathrm{init}}=f\left(N_{\mathrm{ID}}^{\mathrm{cell}}\right)---\left(15\right)$

In LTE 8.0 versions, demodulated reference signal of up link (DM RS, DemodulationReference Signal) and SRS adopt same group of basis sequence, as shown in Equation (16).

$r^{\mathrm{SRS}}\left(n\right)=r_{u,v}^{\left(\mathrm{\&alpha;}\right)}\left(n\right)---\left(16\right)$

At step S101, a plurality of serving BSs all detect the CSI of sub-district separately;

Described serving BS BS600 estimates the CSI of BS600 to the down link of UE600 according to the SRS that UE600 sends, described serving BS BS601 estimates the CSI of BS601 to the down link of UE601 according to the SRS that UE601 sends, and described serving BS BS602 estimates the CSI of BS602 to the down link of UE602 according to the SRS that UE602 sends.

At step S102, serving BS judges whether subscriber equipment enters the CoMP pattern;

The BS600 that described serving BS BS600 basis estimates judges to the CSI of the down link of UE600 whether UE600 enters the CoMP pattern, the BS601 that described serving BS BS601 basis estimates judges to the CSI of the down link of UE601 whether UE601 enters the CoMP pattern, and the BS602 that described serving BS BS602 basis estimates judges to the CSI of the down link of UE602 whether UE602 enters the CoMP pattern.Whether subscriber equipment enters collaboration mode and how switch between collaboration mode and non-collaboration mode is a complicated problems very, present embodiment only provided between collaboration mode and the non-collaboration mode judgement according to and two patterns between the example of changing method.Suppose that serving BS BS600, cooperative base station BS601, BS602 are in wireless area of the same type, the judgement that user equipment (UE) 600 enters collaboration mode as shown in Equation (17),

CoMP_Mode＝f(α，β，γ，...) (17)

The judgement formula that subscriber equipment enters collaboration mode is the function of many independents variable, and wherein, the threshold value of CQI is α, and the threshold value of adjacent area interference is β, and long-time statistical SINR is γ.Triggering subscriber equipment comprises from the incident that non-collaboration mode enters collaboration mode: the CQI value of subscriber equipment is greater than β, the long-time statistical SINR value γ combination less than the one or more incidents such as threshold value that are provided with less than the threshold value of α, adjacent area interference.Triggering subscriber equipment comprises from the incident that collaboration mode enters non-collaboration mode: the CQI value of subscriber equipment is less than β, the long-time statistical SINR value γ combination greater than the one or more incidents such as threshold value that are provided with greater than the threshold value of α, adjacent area interference.Serving BS judges according to metrical information whether subscriber equipment enters collaboration mode, and the words that enter collaboration mode then prepare to carry out the operation of the next step under the collaboration mode, and the words that do not enter collaboration mode are then still carried out the operation of non-collaboration mode.

At step S103, serving BS and cooperative base station all detect the SRS of CoMP subscriber equipment;

As mentioned above, an important innovations point of the present invention is: defined the ability that a base station has the uplink SRS that the CoMP UE that detects other sub-districts sends, and this base station can utilize this SRS to estimate the CSI of this base station to CoMP UE.For example, user equipment (UE) 600 enters the CoMP pattern, and UE600 sends SRS to serving BS BS600, but because SRS is the omnirange transmission, therefore, cooperative base station BS601 and BS602 in fact also can detect the SRS that UE600 sends.But consider that in LTE 8.0 versions SRS is based on Serving cell design, and, although cooperative base station BS601 and BS602 can detect the SRS that Serving cell UE sends, but cooperative base station BS601 and BS602 all can't detect this SRS, so, can't estimate cooperative base station BS601 and BS602 CSI according to this SRS to UE600.In embodiments of the present invention, the present invention proposes cooperative base station BS601 and BS602 and possesses the ability that detects the SRS that UE600 sends, be serving BS BS600 and cooperative base station BS601, the BS602 of UE600, the serving BS BS601 of UE601 and cooperative base station BS600, BS602, the serving BS BS602 of UE602 and cooperative base station BS600, BS601 carry out background communication each other by X2 interface between these three base stations (be serving BS also be cooperative base station).Background information comprises: the bandwidth of the dynamic-configuration of SRS or semi-static configuration, SRS, the transmission cycle of SRS, transmission duration, number of repetition (RPF, Repetition Factor), the cyclic shift of transmitting power (for example, the ratio of the transmitting power of SRS and DM RS), residing subframe, frequency spectrum comb (Comb), sequence, sequence numbering etc.

At step S104, serving BS and cooperative base station are estimated CSI;

As shown in Figure 8, the serving BS BS600 of user equipment (UE) 600 and cooperative base station BS601, BS602 estimate CSI according to detected SRS respectively, and CSI comprises the CSI of CSI, the BS602 of BS600 to CSI, the BS601 of the down link of UE600 to the down link of UE600 to the down link of UE600.In like manner, the serving BS BS601 of user equipment (UE) 601 and cooperative base station BS600, BS602 estimate CSI according to detected SRS respectively, and CSI comprises the CSI of CSI, the BS602 of BS601 to CSI, the BS600 of the down link of UE601 to the down link of UE601 to the down link of UE601.The serving BS BS602 of user equipment (UE) 602 and cooperative base station BS600, BS601 estimate CSI according to detected SRS respectively, and CSI comprises the CSI of CSI, the BS601 of BS602 to CSI, the BS600 of the down link of UE602 to the down link of UE602 to the down link of UE602.

At step S105, exchange background information between serving BS and cooperative base station;

BS600, BS601, BS602 exchange background information.Background information comprises the CSI information that BS600, BS601, BS602 estimate separately.

At step S106, serving BS and cooperative base station are carried out the federated resource scheduling;

The serving BS BS602 of serving BS BS601, the UE602 of serving BS BS600, the UE601 of user equipment (UE) 600, obtain according to exchange, comprise CSI information that BS600, BS601, BS602 estimate separately in interior background information, carry out the federated resource scheduling.

At step S107, the schedule information after serving BS and the scheduling of cooperative base station exchange federated resource;

In the present embodiment, consider that the CoMP pattern is the transmission mode of descending CoMP-CB, therefore, at three user equipment (UE)s 600, UE601, UE602, schedule information after the scheduling of three serving BS/cooperative base station BS600, the BS601 that cooperates with each other, BS602 exchange federated resources, wherein, the transmission mode of CoMP-CB need not to exchange between the base station data that need cooperation transmission.Schedule information behind the combined dispatching comprises data transmission modes, BS600, the BS601 of identification number (ID), BS600, BS601, the BS602 of three the serving BS/cooperative base station BS600, the BS601 that cooperate with each other, BS602, use Resource Block (RB, Resourse Block) of BS602 etc.

At step S108, serving BS and cooperative base station are carried out sending mode selection, power division and transmitter optimization respectively;

At user equipment (UE) 600, on the one hand, the result after serving BS BS600 dispatches according to above-mentioned federated resource carries out sending mode selection, power division and transmitter optimization; On the other hand, the result after cooperative base station BS601, BS602 dispatch according to above-mentioned federated resource carries out sending mode selection, power division and transmitter optimization.At this moment, consider cooperative base station BS601, the main purpose of BS602 communication is to improve the data throughout of cell edge and reduce ICI, therefore, the sending mode of serving BS BS600 and cooperative base station BS601, the sending mode of BS602 should have certain relation, may be to have the data multiplexing relation generally speaking, the diversity relation, multiplexing and diversity syntagmatic, combined coding relation and other syntagmatics, consider that present embodiment adopts the mode of cooperative beam shaping (CoMP-CB), promptly realize base station BS 600 by the cooperative beam forming mechanism, cooperative base station BS601, BS602 uses three base stations the Physical Downlink Shared Channel (PDSCH in the sub-district separately respectively, Physical Downlink Share Channel) respectively to the user equipment (UE) 601 of sub-district separately, UE602, UE603 transmits data, thereby reach the signal receiving quality that improves the wireless area edge or improve data throughout or the purpose of inhibition ICI, therefore, the data that send in the present embodiment are not share mutually.

At step S109, serving BS and cooperative base station transmission data and/or signaling are to subscriber equipment;

In this example, owing to adopt the transmission mode of CoMP-CB, at user equipment (UE) 600, serving BS BS600 transmission signaling and/or data are to user equipment (UE) 600, and cooperative base station BS601, BS602 only send signaling and/or data respectively to user equipment (UE) 601 and UE602; In like manner, at user equipment (UE) 601, serving BS BS601 transmission signaling and/or data are to user equipment (UE) 601, and cooperative base station BS600, BS602 only send signaling and/or data respectively to user equipment (UE) 600 and UE602; At user equipment (UE) 602, serving BS BS602 transmission signaling and/or data are to user equipment (UE) 602, and cooperative base station BS600, BS601 only send signaling and/or data respectively to user equipment (UE) 600 and UE601.

At step S110, subscriber equipment receives data and/or the signaling that serving BS sends.

In this example, owing to adopt the transmission mode of CoMP-CB, user equipment (UE) 600 receives signaling and/or the data that serving BS BS600 sends, user equipment (UE) 601 receives signaling and/or the data that serving BS BS601 sends, and user equipment (UE) 602 receives signaling and/or the data that serving BS BS602 sends.

[second embodiment]

Figure 10 show according among the descending CoMP-MU-MIMO of second embodiment of the invention based on the schematic diagram of the CSI acquisition methods of the SRS of CoMP.As shown in figure 10, base station BS 700, BS701, BS702 is respectively user equipment (UE) 700, UE701, the serving BS of UE702, base station BS 701, BS702 is the cooperative base station of user equipment (UE) 700, base station BS 700, BS702 is the cooperative base station of user equipment (UE) 701, base station BS 700, BS701 is the cooperative base station of user equipment (UE) 702, base station BS 700, BS701, BS702 adopts 2 respectively, 1,1 transmitting antenna, user equipment (UE) 700, UE701, UE702 adopts 2 respectively, 1,1 reception antenna, the common multiuser MIMO (MU-MIMO) that constitutes descending 4 * 4, cooperation is to three user equipment (UE)s 700, UE701, UE702 sends downlink data, thereby constitute the transmission mode of descending CoMP multiuser MIMO (CoMP-MU-MIMO), to reach data throughout that improves the wireless area edge or the purpose that suppresses ICI.In the present embodiment, the SRS information that three user equipment (UE)s 700, UE701, UE702 send not only can be detected by serving BS BS700, BS701, BS702 separately, also can be detected by cooperative base station separately, serving BS and cooperative base station estimate descending CSI according to detected SRS.And the SRS that three user equipment (UE)s 700, UE701, UE702 send adopts the design based on CoMP set (CoMP Set), and the SRS design based on Serving cell among this and first embodiment is different.Figure 11 show according in the descending CoMP-MU-MIMO system of second embodiment of the invention based on the flow chart of the CSI acquisition methods of the SRS of CoMP, the implementation step of second embodiment is described in detail.

At step S200, subscriber equipment sends SRS to serving BS;

Described user equipment (UE) 700, UE701, UE702 send uplink SRS to separately serving BS BS700, BS701, BS702 respectively, between the uplink SRS three that user equipment (UE) 700, UE701, UE702 send separately independently of one another the design, be the SRS of the UE700 sub-district that is based on the BS700 place, the SRS sub-district, UE702 that the SRS of UE701 is based on the BS701 place is based on the sub-district at BS702 place.

At step S201, a plurality of serving BSs all detect the CSI of Serving cell separately;

Described serving BS BS700 estimates the CSI of BS700 to the down link of UE700 according to the SRS that UE700 sends, described serving BS BS701 estimates the CSI of BS701 to the down link of UE701 according to the SRS that UE701 sends, and described serving BS BS702 estimates the CSI of BS702 to the down link of UE702 according to the SRS that UE702 sends.

At step S202, serving BS judges whether subscriber equipment enters the CoMP pattern;

The BS700 that described serving BS BS700 basis estimates judges to the CSI of the down link of UE700 whether UE700 enters the CoMP pattern, the BS701 that described serving BS BS701 basis estimates judges to the CSI of the down link of UE701 whether UE701 enters the CoMP pattern, and the BS702 that described serving BS BS702 basis estimates judges to the CSI of the down link of UE702 whether UE702 enters the CoMP pattern.Similarly, can use judgement cited in the first embodiment of the invention and changing method.

At step S203, serving BS and cooperative base station all detect the SRS of CoMP subscriber equipment;

As mentioned above, another important innovations point of the present invention is: at CoMP UE, independent design separately is based on the uplink SRS of CoMP.For example, as shown in figure 10, because the CoMP-MU-MIMO system comprises UE700, UE701, three subscriber equipmenies of UE702 altogether, therefore, these three are adopted the subscriber equipment of CoMP can adopt unified SRS design, promptly adopt the SRS design based on the CoMP set.Whether the LTE-A system is according to adopting the CoMP transmission mode that all subscriber equipmenies of the base station services overlay area more than of cellular system are divided into CoMP subscriber equipment (CoMP UE) and non-CoMP subscriber equipment (Non-CoMP UE), CoMP UE all belongs to the LTE-A subscriber equipment, and existing LTE-A subscriber equipment (LTE-A UE) among the Non-CoMP UE also has LTE 8.0 version subscriber equipmenies (LTE UE).As mentioned above, another important innovations point of the present invention is: propose to utilize SRS based on LTE-A to distinguish SRS based on CoMP.Present embodiment proposes: at first, keep the SRS of LTE 8.0 versions, as the 14th symbol of the subframe structure among Figure 12; Secondly, may adopt the transmission means of Uplink MIMO and cause the demand of uplink SRS is increased sharply at the LTE-A system, the 14th symbol in LTE 8.0 versions can not satisfy the capacity requirement of the SRS of LTE-A so, therefore, the SRS of LTE-A system must increase the placement that new symbol is used for uplink SRS, as shown in figure 12, the 7th symbol place and/or the 13rd symbol place of the SRS of LTE-A system being placed on subframe structure (should be noted that here, the 7th character position and/or the 13rd character position just are used for purpose for example, also can be placed on other one or more suitable character position places as required); At last, the SRS of CoMP UE also is among the symbol that increases newly, and the mode by code division multiplexing (CDM, CodeDivision Multiplexing) between the non-CoMP UE of CoMP UE and LTE-A is come multiplexing.In addition, SRS based on CoMP also can adopt a kind of Variant Design shown in a kind of Variant Design shown in Figure 13 or Figure 14, similarly, here the 7th symbol (Figure 14) that the SRS of LTE-A system is placed on subframe structure locates or the 13rd symbol (Figure 13) located (to should be noted that here, the 7th character position or the 13rd character position just are used for purpose for example, also can be placed on other suitable character position place as required).As shown in figure 10, user equipment (UE) 700 enters the CoMP pattern, and UE700 is to the SRS of serving BS BS700 transmission based on CoMP, but because SRS is the omnirange transmission, therefore, cooperative base station BS701 and BS702 in fact also can detect the SRS that UE700 sends.In the present embodiment, the present invention proposes cooperative base station BS701 and BS702 and possesses the ability based on the SRS of CoMP that detects that UE700 sends, be serving BS BS700 and cooperative base station BS701, the BS702 of UE700, the serving BS BS701 of UE701 and cooperative base station BS700, BS702, the serving BS BS702 of UE702 and cooperative base station BS700, BS701, carry out background communication each other by X2 interface between these three base stations (be serving BS also be cooperative base station), to detect uplink SRS based on CoMP.SRS information comprises in the background information: the bandwidth of the dynamic-configuration of SRS or semi-static configuration, SRS, the transmission cycle of SRS, transmission duration, number of repetition (RPF, Repetition Factor), the cyclic shift of transmitting power (for example, the ratio of the transmitting power of SRS and DM RS), residing subframe, frequency spectrum comb (Comb), sequence, sequence numbering etc.Wherein,, then need indication, have the good characteristics of real-time, but can increase the expense of downlink signaling by PDCCH (Physical downlinkcontrol channel) if adopt dynamic-configuration based on the SRS of CoMP; If the SRS based on CoMP adopts semi-static configuration, then need have the characteristics of reliable and favorable expandability, and can not increase the signaling consumption of PDCCH, but real-time not to be very good by high-level signaling (for example, RRC, Radio resource control) indication.Consider that following LTE-A system must possess the ability of back compatible LTE 8.0 (LTE) system, and the SRS based on CoMP that present embodiment proposes can only be sent by CoMP UE, non-CoMPUE does not possess the ability of transmission based on the SRS of CoMP, therefore, must consider in the LTE-A system how non-CoMP UE handles the problem based on the SRS of CoMP, it is the shared sign resources that CoMP UE is used to send SRS, be used for LTE 8.0UE by the scheduler schedules of base station and send upstream data, thereby influence the uplink SRS channel estimating performance of CoMP UE.At this problem, the simplest a kind of solution is exactly that the LTE-A system divides different frequency ranges to CoMP UE respectively with LTE 8.0UE, as shown in figure 15, CoMP UE only works in the CoMP frequency range, and LTE 8.0UE only works in the non-CoMP frequency range, i.e. frequency division multiplexing (FDM), like this, the base station can not receive the SRS symbol of CoMP UE transmission and the data symbol that LTE8.0UE sends simultaneously at same frequency range place, therefore, no longer has similar problem.In addition, for the implementation complexity that further reduces the CoMP transmission plan and based on the design of the SRS of CoMP and the complexity of detection, and the precision that improves the SRS detection, can utilize a plurality of descending carrier frequency ranges (Multiple DL carrier frequencies) that the LTE-A system had and the characteristic of a plurality of up-link carrier frequency range (Multiple UL carrier frequencies), adopt the method for fixing mapping between descending carrier frequency range and the up-link carrier frequency range, as shown in figure 16.

At step S204, serving BS and cooperative base station are estimated CSI;

As shown in figure 10, the serving BS BS700 of user equipment (UE) 700 and cooperative base station BS701, BS702 estimate CSI according to detected SRS respectively, and CSI comprises the CSI of CSI, the BS702 of BS700 to CSI, the BS701 of the down link of UE700 to the down link of UE700 to the down link of UE700.In like manner, the serving BS BS701 of user equipment (UE) 701 and cooperative base station BS700, BS702 estimate CSI according to detected SRS respectively, and CSI comprises the CSI of CSI, the BS702 of BS701 to CSI, the BS700 of the down link of UE701 to the down link of UE701 to the down link of UE701.The serving BS BS702 of user equipment (UE) 702 and cooperative base station BS700, BS701 estimate CSI according to detected SRS respectively, and CSI comprises the CSI of CSI, the BS701 of BS702 to CSI, the BS700 of the down link of UE702 to the down link of UE702 to the down link of UE702.

At step S205, exchange background information between serving BS and cooperative base station;

BS700, BS701, BS702 exchange background information.Background information comprises the CSI information that BS700, BS701, BS702 estimate separately.

At step S206, serving BS and cooperative base station are carried out the federated resource scheduling;

The serving BS BS702 of serving BS BS701, the UE702 of serving BS BS700, the UE701 of user equipment (UE) 700, obtain according to exchange, comprise CSI information that BS700, BS701, BS702 estimate separately in interior background information, carry out the federated resource scheduling.

At step S207, serving BS and cooperative base station exchange the schedule information after the federated resource scheduling and/or need the data of cooperation transmission;

At user equipment (UE) 700, serving BS BS700 and cooperative base station BS701, BS702 exchanges the schedule information after the federated resource scheduling and/or needs the data of cooperation transmission, wherein, schedule information behind the combined dispatching comprises serving BS BS700 and cooperative base station BS701, the identification number of BS702 (ID), serving BS BS700 and cooperative base station BS701, the sending mode of the data of BS702, serving BS BS700 and cooperative base station BS701, the use frequency range of BS702 etc., wherein, need the data of cooperation transmission to be meant that serving BS BS700 mails to cooperative base station BS701 by the mode of background communication, the data that need cooperation transmission of BS702, the data of this cooperation transmission can adopt multiplex mode, diversity mode, combined coding mode and other compound modes.

At step S208, serving BS and cooperative base station are carried out sending mode selection, power division and transmitter optimization respectively;

Result after base station BS 700, BS701, BS702 dispatch according to above-mentioned federated resource carries out sending mode selection, power division and transmitter optimization.At this moment, for serving BS BS700, the main purpose of considering cooperative base station BS701, BS702 communication is to improve the data throughout of cell edge and reduce ICI, therefore, the sending mode of the sending mode of serving BS BS700 and cooperative base station BS701, BS702 should have certain relation, may be generally speaking to have data multiplexing relation, diversity relation, multiplexing and diversity syntagmatic, combined coding relation and other syntagmatics.Similarly, for serving BS BS701 or serving BS BS702, also has similar incidence relation between its sending mode.Consider that present embodiment adopts the mode of CoMP-MU-MIMO, promptly realize that by cooperation multiuser MIMO mechanism base station BS 700, three base stations of BS701, BS702 use the Physical Downlink Shared Channel (PDSCH in the sub-district separately respectively, Physical Downlink ShareChannel) transmits data to user equipment (UE) 701, UE702, UE703 respectively, thereby reach the signal receiving quality that improves the wireless area edge or improve data throughout or the purpose of inhibition ICI, therefore, the data that send in the present embodiment are mutually different.

At step S209, serving BS and cooperative base station transmission data and/or signaling are to subscriber equipment;

In this example, owing to adopt the transmission mode of CoMP-MU-MIMO, at user equipment (UE) 700, not only serving BS BS700 sends signaling and/or data to user equipment (UE) 700, and cooperative base station BS701, BS702 also send signaling and/or data simultaneously to user equipment (UE) 700; In like manner, at user equipment (UE) 701, not only serving BS BS701 sends signaling and/or data to user equipment (UE) 701, and cooperative base station BS700, BS702 also send signaling and/or data simultaneously to user equipment (UE) 701; At user equipment (UE) 702, not only serving BS BS702 sends signaling and/or data to user equipment (UE) 702, and cooperative base station BS700, BS701 also send signaling and/or data simultaneously to user equipment (UE) 702.

At step S210, subscriber equipment receives the data and/or the signaling of serving BS and cooperative base station transmission.

Signaling and/or data that user equipment (UE) 700 reception serving BS BS700, cooperative base station BS701 and BS702 send over, signaling and/or data that user equipment (UE) 701 reception serving BS BS701, cooperative base station BS700 and BS702 send over, signaling and/or data that user equipment (UE) 702 reception serving BS BS702, cooperative base station BS700 and BS701 send over.

[the 3rd embodiment]

Figure 17 show according among the up CoMP-MU-MIMO of third embodiment of the invention based on the schematic diagram of the CSI acquisition methods of the SRS of CoMP Set.As shown in figure 17, base station BS 800, BS801, BS802 is respectively user equipment (UE) 800, UE801, the serving BS of UE802, base station BS 801, BS802 is the cooperative base station of user equipment (UE) 800, base station BS 800, BS802 is the cooperative base station of user equipment (UE) 801, base station BS 800, BS801 is the cooperative base station of user equipment (UE) 802, user equipment (UE) 800, UE801, UE802 adopts 1 respectively, 1,1 transmitting antenna, base station BS 800, BS801, BS802 adopts 1 respectively, 1,1 reception antenna, the common multiuser MIMO (MU-MIMO) that constitutes up 3 * 3, cooperation is to three base station BSs 800, BS801, BS802 sends upstream data, thereby constitute the transmission plan of up CoMP multiuser MIMO (CoMP-MU-MIMO), with data throughout that reaches the up link that improves the wireless area edge or the purpose that suppresses up ICI.As shown in figure 17, the SRS information that three user equipment (UE)s 800, UE801, UE802 send in the present embodiment not only can be detected by serving BS BS800, BS801, BS802 separately, also can be detected by cooperative base station separately, serving BS and cooperative base station calculate the CSI of up link according to detected SRS.And the SRS that three user equipment (UE)s 800, UE801, UE802 send adopts the design based on CoMP set (CoMP Set).Figure 18 show according in the up CoMP-MU-MIMO system of third embodiment of the invention based on the flow chart of the CSI acquisition methods of the SRS of CoMP Set, the implementation step of the 3rd embodiment is described in detail.

At step S300, subscriber equipment sends SRS to serving BS;

Described user equipment (UE) 800, UE801, UE802 send uplink SRS to separately serving BS BS800, BS801, BS802 respectively, be to distinguish independent design between the uplink SRS three that user equipment (UE) 800, UE801, UE802 send separately, promptly three of UE800, UE801, UE802 uplink SRS are to design based on the sub-district at BS800, BS801, BS802 place respectively.

At step S301, a plurality of serving BSs detect the CSI of sub-district separately;

Described serving BS BS800 estimates the CSI of UE800 to the up link of BS800 according to the SRS that UE800 sends, described serving BS BS801 estimates the CSI of UE801 to the up link of BS801 according to the SRS that UE801 sends, and described serving BS BS802 estimates the CSI of UE802 to the up link of BS802 according to the SRS that UE802 sends.

At step S302, serving BS judges whether subscriber equipment enters the CoMP pattern;

The UE800 that described serving BS BS800 basis estimates judges to the CSI of the up link of BS800 whether UE800 enters the CoMP pattern of up link, the UE801 that described serving BS BS801 basis estimates judges to the CSI of the up link of BS801 whether UE801 enters up CoMP pattern, and the UE802 that described serving BS BS802 basis estimates judges to the CSI of the up link of BS802 whether UE802 enters up CoMP pattern.

At step S303, serving BS and cooperative base station all detect the SRS of CoMP subscriber equipment;

As shown in figure 17, because up CoMP-MU-MIMO system comprises UE800, UE801, three subscriber equipmenies of UE802 altogether, therefore, these three are adopted the subscriber equipment of up CoMP can adopt unified SRS design, promptly adopt the SRS design based on up CoMP set.As mentioned above, whether the LTE-A system is according to adopting the CoMP transmission mode that all subscriber equipmenies of the base station services overlay area more than of cellular system are divided into CoMP subscriber equipment (CoMP UE) and non-CoMP subscriber equipment (Non-CoMP UE), CoMP UE all belongs to the LTE-A subscriber equipment, but not the subscriber equipment of existing LTE-A (LTE-A UE) among the CoMP UE, LTE 8.0 version subscriber equipmenies (LTE UE) are also arranged, and this division is equally applicable to up CoMP system.As mentioned above, another important innovations point of the present invention is: propose concrete symbol and be used to design SRS based on CoMP.Therefore, the SRS of LTE-A system must increase the placement that new symbol is used for uplink SRS, and as shown in figure 19, present embodiment proposes: at first, keep the SRS of LTE 8.0 versions, as the 14th symbol of the sub-frame of uplink structure among Fig. 2; Secondly, may adopt the transmission means of Uplink MIMO and the problem that causes the demand of uplink SRS is increased sharply at the LTE-A system, the 7th symbol of sub-frame of uplink structure can be used for placing the SRS based on CoMP, (should be noted that here as shown in figure 19, the 7th character position just is used for purpose for example, also can be placed on other suitable character position place as required); The SRS of the non-CoMP UE of LTE-A can be placed in the 14th symbol.As shown in figure 17, user equipment (UE) 800 enters the CoMP pattern, and UE800 is to the SRS of serving BS BS800 transmission based on CoMP, but because SRS is the omnirange transmission, therefore, cooperative base station BS801 and BS802 in fact also can detect the SRS that UE800 sends.In the present embodiment, the present invention proposes cooperative base station BS801 and BS802 and possesses the ability based on the SRS of CoMP that detects that UE800 sends, be serving BS BS800 and cooperative base station BS801, the BS802 of UE800, the serving BS BS801 of UE801 and cooperative base station BS800, BS802, the serving BS BS802 of UE802 and cooperative base station BS800, BS801, carry out background communication each other by X2 interface between these three base stations (be serving BS also be cooperative base station), to detect uplink SRS based on CoMP.

At step S304, serving BS and cooperative base station are estimated CSI;

As shown in figure 17, the serving BS BS800 of user equipment (UE) 800 and cooperative base station BS801, BS802 estimate CSI according to detected SRS respectively, and CSI comprises the CSI of CSI, the UE800 of UE800 to CSI, the UE800 of the up link of BS800 to the up link of BS801 to the up link of BS802.In like manner, the serving BS BS801 of user equipment (UE) 801 and cooperative base station BS800, BS802 estimate CSI according to detected SRS respectively, and CSI comprises the CSI of CSI, the UE801 of UE801 to CSI, the UE801 of the up link of BS801 to the down link of BS800 to the up link of BS802.The serving BS BS802 of user equipment (UE) 802 and cooperative base station BS800, BS801 estimate CSI according to detected SRS respectively, and CSI comprises the CSI of CSI, the UE802 of UE802 to CSI, the UE802 of the up link of BS802 to the up link of BS800 to the up link of BS800.

At step S305, serving BS and cooperative base station exchange background information;

BS800, BS801, BS802 exchange background information.Background information comprises the CSI information that BS800, BS801, BS802 estimate separately.SRS information comprises in the background information: the bandwidth of the dynamic-configuration of SRS or semi-static configuration, SRS, the transmission cycle of SRS, transmission duration, number of repetition (RPF, Repetition Factor), the cyclic shift of transmitting power (for example, the ratio of the transmitting power of SRS and DM RS), residing subframe, frequency spectrum comb (Comb), sequence, sequence numbering etc.

At step S306, serving BS and cooperative base station are carried out the federated resource scheduling;

The serving BS BS802 of serving BS BS801, the UE802 of serving BS BS800, the UE801 of user equipment (UE) 800, obtain according to exchange, comprise up CSI information that BS800, BS801, BS802 estimate separately in interior background information, carry out the federated resource scheduling.

At step S307, the schedule information after serving BS and the scheduling of cooperative base station exchange federated resource;

At user equipment (UE) 800, schedule information after serving BS BS800 and the scheduling of cooperative base station BS801, BS802 exchange federated resource, wherein, the schedule information behind the combined dispatching comprises the use frequency range etc. of up link of sending mode, serving BS BS800 and cooperative base station BS801, BS802 of data of identification number (ID), serving BS BS800 and cooperative base station BS801, the BS802 of serving BS BS800 and cooperative base station BS801, BS802.

At step S308, subscriber equipment carries out transmitter optimization;

The schedule information that user equipment (UE) 800, UE801, UE802 send according to serving BS BS800, BS801, BS802 separately respectively, carry out transmitter optimization, transmitter optimization comprises ascending power distribution, uplink power control etc., thereby reaches data throughout that improves the wireless area up link or the purpose that suppresses ICI.Consider that present embodiment adopts the mode of cooperation multiuser MIMO (CoMP-MU-MIMO), therefore, it is not share mutually that the data in the present embodiment send.

At step S309, subscriber equipment transmission data and/or signaling are to serving BS and/or cooperative base station;

In this example, owing to adopt the transmission mode of up CoMP-MU-MIMO, at user equipment (UE) 800, user equipment (UE) 800 transmission signalings and/or data are to serving BS BS800 and/or cooperative base station BS801, BS802, for example, BS801 and BS802 all can detect the SRS based on CoMP that UE800 sends; In like manner, at user equipment (UE) 801, user equipment (UE) 801 transmission signalings and/or data are to serving BS BS801 and/or cooperative base station BS800, BS802, and for example, BS800 and BS802 all can detect the SRS based on CoMP that UE801 sends; At user equipment (UE) 802, user equipment (UE) 802 transmission signalings and/or data are to serving BS BS802 and/or cooperative base station BS800, BS801, and for example, BS800 and BS801 all can detect the SRS based on CoMP that UE802 sends.

At step S310, the base station receives data and/or the signaling that subscriber equipment sends.

Because present embodiment adopts up CoMP-MU-MIMO transmission means, therefore, data and/or signaling that base station BS 800 reception user equipment (UE)s 800, UE801, UE802 send over, data and/or signaling that base station BS 801 reception user equipment (UE)s 800, UE801, UE802 send over, data and/or signaling that base station BS 802 reception user equipment (UE)s 800, UE801, UE802 send over.

[the 4th embodiment]

Figure 20 show according among the descending CoMP-SU-MIMO of fourth embodiment of the invention based on the schematic diagram of the CSI acquisition methods of the SRS of CoMP Set.As shown in figure 20, base station BS 900 is the serving BS of user equipment (UE) 900, base station BS 901, BS902 is the cooperative base station of user equipment (UE) 900, base station BS 900, BS901, BS902 adopts 2 respectively, 1,1 transmitting antenna, user equipment (UE) 900 adopts 4 reception antennas, common Single User MIMO (SU-MIMO) system that constitutes descending 4 * 4, serving BS BS900 and cooperative base station BS901, the BS902 cooperation sends downlink data to user equipment (UE) 900, thereby constitute the transmission plan of the single user MIM0 of descending CoMP (CoMP-SU-MIMO), to reach data throughout that improves the wireless area edge or the purpose that suppresses ICI.As shown in figure 20, in the present embodiment, the SRS information that user equipment (UE) 900 sends not only can detect by serviced base station BS 900, also can be detected by cooperative base station BS901, BS902 separately, serving BS BS900 and cooperative base station BS901, BS902 estimate descending CSI according to detected SRS.And the SRS that user equipment (UE) 900 sends adopts the design based on CoMP set (CoMP Set), and this is different with the SRS design based on Serving cell among first embodiment.Figure 21 show according in the descending CoMP-SU-MIMO system of fourth embodiment of the invention based on the flow chart of the CSI acquisition methods of the SRS of CoMP Set, the implementation step of the 4th embodiment is described in detail.

At step S400, subscriber equipment sends SRS to serving BS;

Described user equipment (UE) 900 sends uplink SRS to serving BS BS900, and the SRS of UE900 is based on the sub-district at BS900 place.

At step S401, serving BS detects the CSI of Serving cell;

Described serving BS BS900 estimates the CSI of BS900 to the down link of UE900 according to the SRS that UE900 sends.

At step S402, serving BS judges whether subscriber equipment enters the CoMP pattern;

The BS900 that described serving BS BS900 basis estimates judges to the CSI of the down link of UE900 whether UE900 enters the CoMP pattern.

At step S403, serving BS and cooperative base station all detect the SRS of CoMP subscriber equipment;

As mentioned above, another important innovations point of the present invention is: at CoMP UE, independent design separately is based on the uplink SRS of CoMP Set.For example, as shown in figure 20, because the CoMP-SU-MIMO system comprises BS900, BS901, three base stations of BS902 altogether, therefore, these three are adopted the base station of CoMP can adopt unified SRS design, promptly adopt the SRS design based on the CoMP set.As shown in figure 20, user equipment (UE) 900 enters the CoMP pattern, and UE900 sends SRS based on CoMP Set to serving BS BS900, but because SRS is an omnirange sends, therefore, cooperative base station BS901 and BS902 in fact also can detect the SRS that UE900 sends.In the present embodiment, the present invention proposes cooperative base station BS901 and BS902 and possesses the ability based on the SRS of CoMP Set that detects that UE900 sends, and promptly the serving BS BS900 of UE900 and cooperative base station BS901, BS902 can detect the uplink SRS based on CoMP Set respectively.

At step S404, serving BS and cooperative base station are estimated CSI;

As shown in figure 20, the serving BS BS900 of user equipment (UE) 900 and cooperative base station BS901, BS902 estimate CSI according to detected SRS respectively, and CSI comprises the CSI of CSI, the BS902 of BS900 to CSI, the BS901 of the down link of UE900 to the down link of UE900 to the down link of UE900.

At step S405, exchange background information between serving BS and cooperative base station;

BS900, BS901, BS902 exchange background information.Background information comprises the CSI information that BS900, BS901, BS902 estimate separately, and these background information exchange by X2 interface.SRS information comprises in the background information: the bandwidth of the dynamic-configuration of SRS or semi-static configuration, SRS, the transmission cycle of SRS, transmission duration, number of repetition (RPF, Repetition Factor), the cyclic shift of transmitting power (for example, the ratio of the transmitting power of SRS and DM RS), residing subframe, frequency spectrum comb (Comb), sequence, sequence numbering etc.

At step S406, serving BS and cooperative base station are carried out the federated resource scheduling;

Cooperative base station BS901, the BS902 of serving BS BS900, the UE900 of user equipment (UE) 900 in interior background information, carry out the federated resource scheduling according to the exchange CSI information that BS900, BS901, BS902 estimate separately comprising of obtaining.

At step S407, serving BS and cooperative base station exchange the schedule information after the federated resource scheduling and/or need the data of cooperation transmission;

Serving BS BS900 and cooperative base station BS901, BS902 exchanges the schedule information after the federated resource scheduling and/or needs the data of cooperation transmission, wherein, schedule information behind the combined dispatching comprises serving BS BS900 and cooperative base station BS901, the identification number of BS902 (ID), serving BS BS900 and cooperative base station BS901, the sending mode of the data of BS902, serving BS BS900 and cooperative base station BS901, the use frequency range of BS902 etc., wherein, need the data of cooperation transmission to be meant that serving BS BS900 mails to cooperative base station BS901 by the mode of background communication, the data that need cooperation transmission of BS902, the data of this cooperation transmission can adopt multiplex mode, diversity mode, combined coding mode and other compound modes.

At step S408, serving BS and cooperative base station are carried out sending mode selection, power division and transmitter optimization respectively;

On the one hand, the result after serving BS BS900 dispatches according to above-mentioned federated resource carries out sending mode selection, power division and transmitter optimization; On the other hand, the result after cooperative base station BS901, BS902 dispatch according to above-mentioned federated resource carries out sending mode selection, power division and transmitter optimization.At this moment, consider cooperative base station BS901, the main purpose of BS902 communication is to improve the data throughout of cell edge and reduce ICI, therefore, the sending mode of serving BS BS900 and cooperative base station BS901, the sending mode of BS902 should have certain relation, may be to have the data multiplexing relation generally speaking, the diversity relation, multiplexing and diversity syntagmatic, combined coding relation and other syntagmatics, consider that present embodiment adopts the mode of cooperation Single User MIMO (CoMP-SU-MIMO), promptly realize base station BS 900 by Single User MIMO mechanism, cooperative base station BS901, BS902 uses three base stations the Physical Downlink Shared Channel (PDSCH in the sub-district separately respectively, Physical Downlink Share Channel) to user equipment (UE) 900 transmission data, thereby reach the signal receiving quality that improves the wireless area edge or improve data throughout or the purpose of inhibition ICI, therefore, the data that send in the present embodiment are not share mutually.

At step S409, serving BS and cooperative base station transmission data and/or signaling are to subscriber equipment;

In this example, owing to adopt the transmission mode of CoMP-SU-MIMO, serving BS BS900, cooperative base station BS901, BS902 all send signaling and/or data to user equipment (UE) 900.

At step S410, subscriber equipment receives the data and/or the signaling of serving BS and cooperative base station transmission.

Data and/or signaling that user equipment (UE) 900 reception serving BS BS900 and cooperative base station BS901, BS902 send over.

[hardware realization]

Figure 22 shows the schematic diagram that obtains the base station of CSI based on SRS according to of the present invention.

As shown in figure 22, base station of the present invention comprises Transmit-Receive Unit 21, SRS measuring unit 22, CSI acquiring unit 23, data processing unit 24, collaboration mode judging unit 25, crosspoint 26, scheduling of resource unit 27, power division and optimization unit 28.

Can realize the function of serving BS of the present invention and cooperative base station according to the base station of present embodiment,, only describe for example that the concrete operations flow process can be referring to the various embodiments described above here for fear of giving unnecessary details.The said units structure can form single by the mode of combination or other cellular construction in addition.

Data and/or signaling that Transmit-Receive Unit 21 receives from subscriber equipment or adjacent base station, and to subscriber equipment transmission data and/or signaling.

The SRS signal that SRS measuring unit 22 detects from Transmit-Receive Unit 21;

CSI acquiring unit 23 is according to the SRS signal from SRS measuring unit 22, estimates or calculates channel status characteristic information (for example, CQI, CSI etc.).

24 pairs of data processing units receive data and carry out processing such as down-conversion, sampling, channel estimating, Data Detection, data demodulates, data merging.

Collaboration mode judging unit 25 judges according to the channel status characteristic information that obtains whether subscriber equipment enters collaboration mode.Here, it should be noted, as described in embodiment before, judge whether to enter collaboration mode and have multiple mode, also can not judge according to this channel status characteristic information.In addition, also can be directly enter collaboration mode, thereby omit collaboration mode judging unit 25 according to the request of subscriber equipment.

Schedule information after crosspoint 26 is further dispatched with the cooperation cell exchange resource.In down collaboration communication, crosspoint 26 also will exchange needs cooperation to send to the data of subscriber equipment.

Scheduling of resource unit 27 is dispatched (comprising up and/or the downlink resource distribution) according to the channel status characteristic information of exchange with the unified federated resource that carries out of cooperative base station.In down collaboration communication, also will further determine the data transmission modes of each base station and/or need the data of cooperation transmission.

Power division with optimize 28 pairs of unit and need the data of cooperation transmission to carry out power division, carrying out being sent to subscriber equipment by Transmit-Receive Unit 21 after transmitter optimization handles (comprise aerial angle to transmitter, antenna number, transmitted power etc. adjust).

It should be noted that in uplink coordinated communication after Transmit-Receive Unit 21 was sent to subscriber equipment with schedule information, this subscriber equipment was sent to data serving BS and cooperative base station respectively according to the ascending resource information after dispatching.Afterwards, crosspoint 26 and cooperative base station are exchangeed subscriber the upstream data that equipment sends, and merge processing by data processing unit 24, thereby realize the upstream data collaboration communication.

Figure 23 shows the schematic diagram according to subscriber equipment of the present invention.

For fear of giving unnecessary details, only illustrate the structure of subscriber equipment here, the concrete operations flow process can be referring to the various embodiments described above.

As shown in figure 23, comprise Transmit-Receive Unit 31, data processing unit 32, schedule information acquiring unit 33, transmitter optimization unit 34 and SRS transmitting element 35 according to subscriber equipment of the present invention.

Transmit-Receive Unit 31 receives from the data signaling of base station with to the base station and sends data and/or signaling.

The data of 32 pairs of receptions of data processing unit are handled, and processing procedure comprises down-conversion, sampling, channel estimating, Data Detection, data merging etc.Here, data processing unit 32 can have communication environment information and obtain function, can further obtain and communication environment information, and feeding back to the base station via Transmit-Receive Unit 31, described communication environment information comprises at least one in the following information: the channel status characteristic information and the neighbor cell interference information of reflection channel status characteristic.

Obtain cooperative information the data of schedule information acquiring unit 33 after handling, comprise the information that serving BS indication subscriber equipment enters collaboration mode, and the schedule information after serving BS and the scheduling of cooperative base station federated resource.Comprise that in schedule information the indication subscriber equipment enters under the situation of down collaboration pattern, after downlink data transmission was carried out in the cooperation of serving BS and cooperative base station, data processing unit 32 merged processing according to the above-mentioned schedule information from serving BS to the data from serving BS and cooperative base station; Comprise that at cooperative information the indication subscriber equipment enters under the situation of uplink coordinated pattern, carries out respective handling by transmitter optimization unit 34.

Transmitter optimization unit 34 is optimized according to the transmitter of cooperative information to up link, comprise up sending mode selection, power division, Bit Allocation in Discrete, feedback system selection etc., and the data that will send after will optimizing send to serving BS and cooperative base station respectively via Transmit-Receive Unit 31.

SRS transmitting element 35 sends the uplink SRS signal to serving BS and cooperative base station.

As mentioned above, the embodiment of the invention has provided based on the acquisition methods of the channel condition information of SRS, base station and subscriber equipment, has simplicity of design, comprehensive, efficient, flexible characteristic.Therefore, the present invention proposes is used for the acquisition methods based on the channel condition information of SRS of radio transmission technical field, base station and subscriber equipment, can comprise third generation cellular mobile network (3G) for various wireless or mobile networks, super three generations's cellular mobile network (S3G, B3G), the 4th generation cellular mobile network (4G), single-frequency radio network (SFN), wireless lan (wlan), wireless wide area network (WWAN), multimedia broadcast-multicast service net (MBMS), self-organization network (Mesh, Ad Hoc, Censor Network), the network cooperation problem of digital home network systems such as (e-Home) provides important theory foundation and concrete implementation method.

In above description, at each step, enumerated a plurality of examples, though the inventor indicates example associated with each other as much as possible, this does not also mean that must there be corresponding relation in these examples according to corresponding label.As long as selected example do not have contradiction between given condition, can in different steps, select the not corresponding example of label to constitute the corresponding techniques scheme, such technical scheme also should be considered as within the scope of the invention involved.

Should be noted in the discussion above that in above description,, show technical scheme of the present invention, but be not intended that the invention be limited to above-mentioned steps and cellular construction only in the mode of example.Under possible situation, can adjust and accept or reject step and cellular construction as required.Therefore, some step and unit are not to implement the necessary element of overall invention thought of the present invention.Therefore, technical characterictic essential to the invention only is subject to the minimum requirements that can realize overall invention thought of the present invention, and is not subjected to the restriction of above instantiation.

So far invention has been described in conjunction with the preferred embodiments.Should be appreciated that those skilled in the art can carry out various other change, replacement and interpolations under the situation that does not break away from the spirit and scope of the present invention.Therefore, scope of the present invention is not limited to above-mentioned specific embodiment, and should be limited by claims.

Claims (24)

1. channel state information acquisition method may further comprise the steps:

Detect the detection reference signal SRS that subscriber equipment sends;

According to detected SRS, obtain channel condition information;

Based on the required channel condition information of resource allocation, carry out the federated resource scheduling with other base stations;

With schedule information after the scheduling of other base station exchange federated resources and/or need the data of cooperation transmission;

Carry out sending mode selection, power division and transmitter optimization with other base stations; And

Send data and/or signaling to subscriber equipment.

2. channel state information acquisition method according to claim 1 is characterized in that

When described subscriber equipment was cooperative multipoint transmission/reception CoMP subscriber equipment, the CoMP subscriber equipment adopted and sends SRS based on CoMP.

3. channel state information acquisition method according to claim 2 is characterized in that

Adopt one or more symbols to place the SRS that has only the LTE-A subscriber equipment to detect in the subframe of the up link of CoMP subscriber equipment, described one or more symbols are placed on the 7th symbol place and/or the 13rd symbol place of subframe.

4. channel state information acquisition method according to claim 3 is characterized in that

The non-CoMP subscriber equipment of CoMP subscriber equipment and LTE-A comes multiplexing SRS in code division multiplexing CDM mode.

5. channel state information acquisition method according to claim 3 is characterized in that

The SRS that the LTE-A subscriber equipment can detect is used for whole CoMP subscriber equipmenies.

6. channel state information acquisition method according to claim 1 is characterized in that

The SRS that described subscriber equipment sends is placed in the CoMP frequency range of up link of serving BS and/or cooperative base station.

7. channel state information acquisition method according to claim 6 is characterized in that

Have mapping relations one to one between the CoMP frequency range of the up link of serving BS and/or cooperative base station and the carrier wave frequency range of down link.

8. channel state information acquisition method according to claim 1 is characterized in that

When described subscriber equipment was cooperative multipoint transmission/reception CoMP subscriber equipment, serving BS and cooperative base station all detected the SRS that the CoMP subscriber equipment sends.

9. channel state information acquisition method according to claim 1 is characterized in that

When described subscriber equipment was cooperative multipoint transmission/reception CoMP subscriber equipment, serving BS and cooperative base station all according to the detected SRS that is sent by the CoMP subscriber equipment, were obtained channel condition information.

10. channel state information acquisition method according to claim 1 is characterized in that

When adopting the CoMP transmission means, serving BS and cooperative base station exchange background information, background information comprises at least one in the following information: the bandwidth of the channel condition information that is obtained, the dynamic-configuration of SRS or semi-static configuration, SRS, the transmission cycle of SRS, transmission duration, number of repetition, transmitting power, residing subframe, frequency spectrum comb, the cyclic shift of sequence, sequence numbering.

11. channel state information acquisition method according to claim 10 is characterized in that

The required channel condition information of resource allocation comprises at least one in the following information:

The down link of the subscriber equipment of-serving BS and Serving cell and/or uplink channel state characteristic information,

The down link of the subscriber equipment of-serving BS and non-service cell and/or uplink channel state characteristic information,

The down link of the subscriber equipment of-cooperative base station and Serving cell and/or uplink channel state characteristic information, and

The down link of the subscriber equipment of-cooperative base station and non-service cell and/or uplink channel state characteristic information.

12. a base station comprises:

Transmit-Receive Unit receives data and/or signaling from subscriber equipment or adjacent base station, and sends data and/or signaling to subscriber equipment;

Detection reference signal SRS measuring unit detects the SRS signal that is sent by subscriber equipment from Transmit-Receive Unit;

The channel condition information acquiring unit according to the SRS signal from the SRS measuring unit, is estimated or is calculated the channel status characteristic information;

The collaboration mode judging unit judges according to the channel status characteristic information that obtains whether subscriber equipment enters collaboration mode;

The scheduling of resource unit, according to the channel status characteristic information of other base station exchange, carry out the federated resource scheduling with other base stations, and with other base station specified data sending modes and/or need the data of cooperation transmission; And

Power division and optimization unit are carried out power division to the data that need cooperation transmission, and carry out transmitter optimization and handle.

13. base station according to claim 12 is characterized in that

Described Transmit-Receive Unit detects the SRS by cooperative multipoint transmission/reception CoMP subscriber equipment sends.

14. base station according to claim 13 is characterized in that

Described CoMP subscriber equipment is the CoMP subscriber equipment that is positioned at the Serving cell of described base station, or is positioned at the CoMP subscriber equipment of Serving cell of the cooperative base station of described base station.

15. base station according to claim 12 is characterized in that

Described channel condition information processing unit estimation or the channel status characteristic information that calculates comprise at least one in the following information:

The down link of the subscriber equipment of-serving BS and Serving cell and/or uplink channel state characteristic information,

The down link of the subscriber equipment of-serving BS and non-service cell and/or uplink channel state characteristic information,

The down link of the subscriber equipment of-cooperative base station and Serving cell and/or uplink channel state characteristic information, and

The down link of the subscriber equipment of-cooperative base station and non-service cell and/or uplink channel state characteristic information.

16. base station according to claim 12 is characterized in that

Described collaboration mode judging unit also according to the channel condition information of the Serving cell of measuring, judges whether subscriber equipment enters collaboration mode.

17. base station according to claim 12 is characterized in that

Described scheduling of resource unit carries out the federated resource scheduling to downlink resource.

18. base station according to claim 12 is characterized in that

Described scheduling of resource unit carries out the federated resource scheduling to ascending resource, and

Described Transmit-Receive Unit is sent to described subscriber equipment with described schedule information,

At described subscriber equipment according to described schedule information, data are sent to described base station and described other base stations respectively after, the data that send by described subscriber equipment that described base station and described other base station exchange are received.

19. base station according to claim 18 also comprises:

Data processing unit merges processing to the data that obtain with exchange, that sent by described subscriber equipment that receive.

20. a subscriber equipment comprises:

Transmit-Receive Unit receives from the data of base station and/or signaling with to the base station and sends data and/or signaling;

The schedule information acquiring unit, obtain cooperative information from the data that receive, described cooperative information comprises at least one in the following information: serving BS indication subscriber equipment enters the information of collaboration mode and the schedule information after serving BS and the scheduling of cooperative base station federated resource;

The transmitter optimization unit is optimized according to the transmitter of cooperative information to up link, and the data that will send after will optimizing send to serving BS and cooperative base station respectively via described Transmit-Receive Unit; And

Detection reference signal SRS transmitting element sends SRS to serving BS and cooperative base station.

21. subscriber equipment according to claim 20 is characterized in that

When described subscriber equipment was in cooperative multipoint transmission/reception CoMP pattern, described SRS transmitting element sent SRS based on CoMP to serving BS and cooperative base station.

22. subscriber equipment according to claim 20 also comprises:

Data processing unit gets access to serving BS indication subscriber equipment when entering the information of down collaboration pattern at described schedule information acquiring unit, according to schedule information, the data from serving BS and/or cooperative base station is merged processing; And get access to serving BS indication subscriber equipment at described schedule information acquiring unit and enter under the information of uplink coordinated pattern, the corresponding transmitter optimization process is carried out in indication transmitter optimization unit.

23. subscriber equipment according to claim 22 is characterized in that

Described data processing unit also is used for the obtaining communication environmental information, and feeding back to the base station via described Transmit-Receive Unit, described communication environment information comprises at least one in the following information: the channel status characteristic information and the neighbor cell interference information of reflection channel status characteristic.

24. a channel state information acquisition method comprises the steps:

Serving BS and cooperative base station detect the detection reference signal SRS that subscriber equipment sends;

Serving BS and cooperative base station are obtained channel condition information according to detected SRS;

Serving BS and cooperative base station are based on the required channel condition information of resource allocation, and the collaborative federated resource that carries out is dispatched;

Schedule information after serving BS and the scheduling of cooperative base station exchange federated resource;

Schedule information after the federated resource that subscriber equipment sends over according to serving BS is dispatched is carried out transmitter optimization; And

Subscriber equipment transmission data and/or signaling are to serving BS and/or cooperative base station.

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