CN103560816A - Method for multi-antenna multi-base-station cooperation of downlink cellular system and base station - Google Patents
Method for multi-antenna multi-base-station cooperation of downlink cellular system and base station Download PDFInfo
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Abstract
The invention discloses a method for multi-antenna multi-base-station cooperation of a downlink cellular system and a base station. The method for multi-antenna multi-base-station cooperation of the downlink cellular system comprises the steps that a serving base station judges whether user equipment enters a multi-antenna multi-base-station cooperation working mode or not, and the serving base station uses downlink control signaling to carry out configuration on the user equipment when the user equipment enters the multi-antenna multi-base-station cooperation working mode; the user equipment obtains system information and channel state information of the serving base station and system information and channel state information of cooperative base stations, and carries out feedback on the information, the serving base station obtains the channel state information of downlink channels arranged between the user equipment and the serving base station and between the user equipment and the cooperative base stations, and resource scheduling and background communication are carried out; the user equipment obtains a distribution instruction of downlink resources, and the serving base station and the cooperative base stations send data to the user equipment in a multi-antenna multi-base-station cooperation mode. The method for multi-antenna multi-base-station cooperation of the downlink cellular system and the base station have the advantages of being wide in application range, reasonable in signaling, easy to implement and the like.
Description
The application is dividing an application of the application No:200810146047.3 that is entitled as " method and the base station of the multi-antenna multi-base station cooperation of downlink honeycomb system " that submits on August 8th, 2008.
Technical field
The present invention relates to the method for multi-antenna multi-base station cooperation in communication technical field and base station that should be in this way, more specifically, relate to a kind of being applied in downlink honeycomb system by the cooperation of multi-antenna multi-base station, improve the method for downlink transmission data rate and the base station of using the method.
Background technology
Many antennas (MIMO:Multiple In Multiple Out) Radio Transmission Technology, at transmitting terminal and many antennas of receiving terminal configuration, is used to the space resources in wireless transmission, obtains spatial reuse gain and space diversity gain.Information theory research shows, the capacity of mimo system, along with the minimum value linear growth of number of transmit antennas and reception antenna number.As shown in Figure 1, in Fig. 1, many antennas of transmitting terminal and receiving terminal form multi-antenna wireless channel to the schematic diagram of mimo system, comprise spatial information (si).In addition, OFDM technology (OFDM) has stronger anti-fading ability and higher frequency efficiency, is applicable to the high speed data transfer in multi-path environment and fading environment.The MIMO-OFDM technology that MIMO technology and OFDM technology are combined, has become the core technology of next-generation mobile communications.
For example, 3GPP (3G (Third Generation) Moblie partner plan) tissue is the international organization in moving communicating field, and she plays an important role in the standardization effort of 3G cellular telecommunication art.3GPP tissue designed EUTRA (universal mobile telecommunications system of evolution and the access of continental rise radio) 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.The down link of LTE system adopts MIMO-OFDM technology exactly.In April, 2008,3GPP is organized in China Shenzhen meeting, starts to inquire into the standardization effort of 4G cellular communication system.At the meeting, the concept of a kind of by name " multi-antenna multi-base station cooperation " obtains extensive concern and support, and its core concept is to adopt a plurality of base stations simultaneously for a user or a plurality of user provide communication service, thereby improves the message transmission rate of cell boundary users.
In some technical literatures, for downlink honeycomb system, there are three kinds of multi-antenna multi-base station cooperative methods:
(1) method based on assembling signal: travelling carriage, according to its directional diagram of the Information Selection such as distributed base station and self-position, has the sensing that a plurality of field intensity are relatively strong to point to respectively different antenna for base station in directional diagram.Distributed base station selects suitable base station and antenna thereof to carry out aggregation operator by cooperative cooperating according to the particular geographic location of travelling carriage, at travelling carriage, forms a focusing field around, makes mobile portable antennas in the relatively strong position of field intensity.Referring to patent documentation 1 " a kind of communication means and system based on assembling the distributed multi-antenna of signal ", Chinese patent application publication number, CN101047415.
(2) method based on virtual MIMO technology: by many antennas of many base stations, be considered as virtual single base station system with more antennas, thereby obtain larger spatial reuse and space diversity gain.In addition, the mechanism that reuses single base station system contributes to reduce the implementation complexity of multi-antenna multi-base station system.Referring to non-patent literature 1:3GPP, R1-082501, " Collaborative MIMO for LTE-A downl ink ", Alcatel-Lucent (3GPP document, numbering: R1-082501, " the cooperation MIMO technology ”， Alcatel-Lucent company in LTE-A downlink system).
(3) method independently operating based on single base station: be equipped with single base station of many antennas independently for subscriber equipment provides service, then subscriber equipment superposes the data of a plurality of single base stations, obtains higher spatial reuse and space diversity gain.The method realizes simple, and signaling consumption is less.Referring to non-patent literature 2:3GPP, R1-082497, " Network MIMO Preeoding ", Texas Instruments (3GPP document, numbering: R1-082497, " precoding of network MIMO system ", Texas Instruments company).
But method one is only the multi-antenna multi-base station cooperation on energy sense, and systematic function and geographical position closely related, cause range of application limited; Method two lays particular emphasis on conceptual elaboration, for major issues such as the user's configuration in multi-antenna multi-base station, user feedbacks, does not further discuss; Although it is simple that method three realizes, completely independently the work of single base station can not embody the advantage of multi-antenna multi-base station cooperation, so its poor-performing.
Summary of the invention
The object of the invention is to for range of application in prior art limitedly, or the incomplete shortcoming of system, provides a kind of multi-antenna multi-base station cooperative method and base station of downlink honeycomb system.
In a first aspect of the present invention, a kind of method of multi-antenna multi-base station cooperation of downlink honeycomb system has been proposed, this downlink honeycomb system comprises at least one subscriber equipment and serving BS and at least one cooperation base station of service is provided to this subscriber equipment.The method comprises the steps: that serving BS judges whether that subscriber equipment enters the mode of operation of multi-antenna multi-base station cooperation; Serving BS is used descending control signaling to be configured entering the subscriber equipment of this mode of operation; Subscriber equipment obtains the system information of serving BS and each cooperation base station and the channel condition information that resource is distributed required down channel based on this configuration; Subscriber equipment is to the channel condition information of the required down channel of serving BS feedback resource allocation; Serving BS distributes the channel condition information of required down channel based on resource, carry out scheduling of resource, and at least sends scheduling of resource result and downlink communication data to each cooperation base station; And the distribution indication that at least sends downlink resource from serving BS to subscriber equipment.
According to embodiments of the invention, this serving BS one of at least judges whether that subscriber equipment enters the mode of operation of multi-antenna multi-base station cooperation based on following factor: the downlink data buffer status of the geographical position of subscriber equipment, the path loss of subscriber equipment, subscriber equipment.
According to embodiments of the invention, this descending control signaling comprises configuration information, and this configuration information at least comprises: the community number of cooperation base station, the transmission means of downlink data.
According to embodiments of the invention, this descending control signaling comprises configuration information, and this configuration information at least comprises: the community number of cooperation base station, antenna configuration.
According to embodiments of the invention, the serving BS that this subscriber equipment obtains and the system information of each cooperation base station at least comprise antenna configuration.
According to embodiments of the invention, subscriber equipment obtains the system information of serving BS by the broadcast channel of serving BS, and subscriber equipment obtains the system information of each cooperation base station by the broadcast channel of each cooperation base station.
According to embodiments of the invention, subscriber equipment obtains the system information of serving BS by the broadcast channel of serving BS, and subscriber equipment obtains the system information of each cooperation base station by configuration information.
According to embodiments of the invention, this subscriber equipment is only to the channel condition information of the required down channel of serving BS feedback resource allocation.
According to embodiments of the invention, this subscriber equipment is respectively to serving BS and each cooperation base station, the channel condition information of the down channel that feedback resource allocation is required.
According to embodiments of the invention, this serving BS, by the feedback of subscriber equipment, obtains the channel condition information that resource is distributed required down channel.
According to embodiments of the invention, each cooperation base station is given this serving BS the channel condition information of serving BS required down channel in resource is distributed by background transfer.
According to embodiments of the invention, this distribution indication comprise the frequency location of downlink resource and serving BS send precoding information that data need use one of at least.
According to embodiments of the invention, this distribution indication comprise frequency location, the serving BS of downlink resource send precoding information that data need use and each cooperation base station send precoding information that data need use one of at least.
According to embodiments of the invention, this distribution indication that at least sends downlink resource from serving BS to subscriber equipment comprises: by serving BS and each cooperation base station, indicated respectively to the distribution of subscriber equipment transmission downlink resource, this distribution indication at least comprises that the frequency location of downlink resource, base station send the precoding information that data need be used.
In another aspect of this invention, also proposed a kind of base station, as serving BS, realized the multi-antenna multi-base station cooperation of downlink honeycomb system together with at least one cooperation base station.This base station comprises the steps: judging unit, judges whether that subscriber equipment enters the mode of operation of multi-antenna multi-base station cooperation; Descending control signaling transmitting element, is used descending control signaling to be configured entering the subscriber equipment of this mode of operation; Scheduling of resource unit, receives the channel condition information that distributes required down channel from the resource of subscriber equipment feedback, carries out scheduling of resource, and at least send scheduling of resource result and downlink communication data to each cooperation base station based on this channel condition information; And distribute indication transmitting element, to subscriber equipment, send the distribution indication of downlink resource.
Thus, multi-antenna multi-base station cooperative method and the base station of the downlink honeycomb system that the present invention proposes, comprise user's configuration, user feedback, and resource is distributed the contents such as indication, has applied widelyly, and signaling is reasonable, is easy to the advantages such as realization.
Accompanying drawing explanation
By below in conjunction with accompanying drawing explanation the preferred embodiments of the present invention, will make of the present invention above-mentioned and other objects, features and advantages are clearer, wherein:
Fig. 1 is the schematic diagram of MIM0 system;
Fig. 2 is the schematic diagram of multi cell cellular communication system;
Fig. 3 is the schematic block diagram of the base station of realizing multi-antenna multi-base station cooperative method of the downlink honeycomb system of the embodiment of the present invention;
Fig. 4 is the flow chart of multi-antenna multi-base station cooperative method of the downlink honeycomb system of the embodiment of the present invention;
Fig. 5 is the schematic diagram of the application examples one of embodiments of the invention;
Fig. 6 is the schematic diagram of the application examples two of embodiments of the invention;
Fig. 7 is the schematic diagram of the application examples three of embodiments of the invention;
Fig. 8 is the schematic diagram of the application examples four of embodiments of the invention.
Embodiment
To a preferred embodiment of the present invention will be described in detail, in description process, having omitted is unnecessary details and function for the present invention with reference to the accompanying drawings, to prevent that the understanding of the present invention from causing, obscures.
For clear, at length set forth performing step of the present invention, provide some specific embodiments of the invention below, be applicable to descending LTE cellular communication system.It should be noted that, the invention is not restricted to the application described in embodiment, but applicable to other communication systems.
With reference to figure 2, wherein shown the schematic diagram of a multi cell cellular communication system.Cellular system is divided into service coverage area the wireless coverage area ，Ji community joining.Tu2Zhong， community is schematically depicted as regular hexagon, and whole coverage is spliced by community 100～104.Relevant respectively to community 100～104 is base station 200～204.Each of base station 200～204 comprises a transmitter, a receiver and a base station control unit, and this is known in the field.In Fig. 2, base station 200～204 is schematically depicted as a certain region that is positioned at community 100～104, and is equipped with omnidirectional antenna.But in the cell layout of cellular communication system, base station 200～204 can be equipped with directional antenna, there is the ，Gai subregion, subregion of coverage cell 100～104, direction ground to be commonly called sector.Therefore, the expression of the multi cell cellular communication system of Fig. 2 is only 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. 2, base station 200～204 is connected with each other by X2 interface 300～304.In LTE system, three node layer network configurations of base station, wireless network control unit and core net are simplified to two-layer node structure.Wherein, the function of wireless network control unit is divided into base station, and base station is coordinated and communicated by letter by the wireline interface of " X2 " by name with base station.
Interior several subscriber equipmenies 400～430 that distributing in Tu2Zhong， community 100～104.Each of subscriber equipment 400～430 comprises a transmitter, a receiver and a mobile terminal control unit, and this is known in the art.Subscriber equipment 400～430 is by the serving BS for service separately (in base station 200～204 some) access cellular communication system.Should be understood that, although only schematically draw 16 subscriber equipmenies in Fig. 2, the number of the subscriber equipment in actual conditions is quite huge.In this sense, Fig. 2 for subscriber equipment to describe be only also illustrative purpose.Subscriber equipment 400～430 is by base station 200～204 access cellular communications networks for service separately, directly for providing the base station of communication service, certain subscriber equipment is called as the serving BS of this subscriber equipment, other base stations are called as the non-serving base stations of this subscriber equipment, non-serving base stations can be used as the cooperation base station of serving BS, together for user provides communication service.
Fig. 3 is the schematic block diagram of the base station of the multi-antenna multi-base station cooperative method of the downlink honeycomb system of the use embodiment of the present invention.
As shown in Figure 3, according to the base station 200,202 of the embodiment of the present invention, 204 comprise: user device parameters memory 211, and judging unit 212, descending control signaling transmitting element 213, distributes indication transmitting element 215 and Resource Scheduler 214.
The relevant parameter of user device parameters memory 211 200,202,204 interior storage subscriber equipmenies in base station.The relevant parameter of this subscriber equipment includes but not limited to: the situation of the geographical position of subscriber equipment and/or the path loss of subscriber equipment and/or user's equipment downward data buffer storage.
The relevant parameter of the subscriber equipment that judging unit 212 is stored according to user device parameters memory 211, judges whether subscriber equipment enters the mode of operation of multi-antenna multi-base station cooperation.
Descending control signaling transmitting element 213 is for sending descending control signaling by descending air interface, to subscriber equipment is carried out to the configuration of multi-antenna multi-base station working method.
Resource Scheduler 214 receives the channel condition information that the resource sending from subscriber equipment is distributed required down channel, and according to the channel condition information from subscriber equipment, carry out scheduling of resource, and carry out background communication by X2 interface, to cooperation base station, send scheduling of resource result and downlink communication data;
In this example, consider the concrete configuration of LTE system, the document of organizing with reference to 3GPP: TS36.213V8.3.0, " Evolved Universal Terrestrial Radio Access (E-UTRA); Physical Layer Procedures " (physical layer procedure of the general continental rise radio access of evolution).Wherein defined the transmission means of 7 kinds of downlink datas: single-antenna transmission (is used single antenna to transmit, it is a special case of mimo system, which can only be transmitted single layer data), transmit diversity is (in mimo system, utilize the time or/and the diversity of frequency, transmit, to improve the quality of reception of signal, which can only be transmitted single layer data), open loop space division multiplexing (not needing the space division multiplexing of subscriber equipment feeding back channel state information), closed loop space division multiplexing (needing the space division multiplexing of subscriber equipment feeding back channel state information), multiuser MIMO (being that a plurality of users are simultaneously with the downlink communication that frequently participates in mimo system), the precoding of closed loop individual layer (is used mimo system, adopt precoding technique, only transmit single layer data), beam forming transmitting (is used mimo system, adopt beam forming technique, only transmit single layer data).
When explanation the present embodiment, adopt the method for following multi-antenna multi-base station cooperation: single layer data is only transmitted in the serving BS of subscriber equipment and cooperation base station.Therefore, the transmission means of the optional downlink data of serving BS and cooperation base station has: single-antenna transmission, transmit diversity, the open loop space division multiplexing of individual layer, the precoding of closed loop individual layer, the multiuser MIMO of individual layer, 6 kinds of beam forming transmittings etc.If different base station is launched identical single layer data, just form the space diversity (also referred to as grand diversity) between base station.If different base station is launched different single layer data, just form the spatial reuse between base station.It is pointed out that the method that adopts above-mentioned multi-antenna multi-base station cooperation, be only used to specific embodiment of the invention is described and do for example, and do not mean that the present invention needs above-mentioned restrictive condition in implementation process.
Fig. 4 shows the flow chart of multi-antenna multi-base station cooperative method of the downlink honeycomb system of the embodiment of the present invention.As shown in Figure 4, according to the method for the embodiment of the present invention, comprise the following steps:
Step 500: the judging unit 212 of serving BS judges based on canned data in user device parameters memory 212 whether subscriber equipment enters the mode of operation of multi-antenna multi-base station cooperation.
Preferably, described serving BS judges that the dependence factor whether subscriber equipment enters the mode of operation of multi-antenna multi-base station cooperation comprises, at least one in the downlink data buffer status of the geographical position of subscriber equipment, the path loss of subscriber equipment, subscriber equipment, these information are stored in user device parameters memory 212.But, being noted that above each parameter is still the example of described relevant parameter, and should not limiting the invention to these parameters, those of ordinary skills can be as required and following technological progress, chooses any other suitable parameter.
In the present embodiment, in the multi cell cellular system shown in Fig. 2, for base station 200, according to subscriber equipment 400～414 to base station 200 path loss values subscriber equipment is divided into groups, make subscriber equipment centered by subscriber equipment 400～406; Make subscriber equipment 408～414 for boundary user equipment.
For base station 202, according to subscriber equipment 416～422 to base station 202 path loss values subscriber equipment is divided into groups, make subscriber equipment centered by subscriber equipment 418～422; Make subscriber equipment 416 for boundary user equipment.
For base station 204, according to subscriber equipment 424～430 to base station 204 path loss values subscriber equipment is divided into groups, make subscriber equipment centered by subscriber equipment 424～426; Make subscriber equipment 428～430 for boundary user equipment.It is to be noted, according to subscriber equipment, to the path loss values of base station, subscriber equipment is divided into central user equipment and boundary user equipment, just in order to illustrate, choose the mode of operation that suitable subscriber equipment enters multi-antenna multi-base station cooperation, and do not mean that judgement subscriber equipment enters the mode of operation of multi-antenna multi-base station cooperation, must carry out above-mentioned grouping process.
Suppose that serving BS makes all boundary user equipment enter the mode of operation of multi-antenna multi-base station cooperation, so, take base station 202 as example, subscriber equipment 416 is the mode of operation in multi-antenna multi-base station cooperation just.The user who it is pointed out that above-mentioned multi-antenna multi-base station cooperation selects, and is only giving an example that the mode of operation of subscriber equipment is switched, and does not mean that the present invention needs above-mentioned restrictive condition in implementation process.
Suppose that boundary user equipment that serving BS makes all downlink data buffer memorys be greater than thresholding K enters the mode of operation of multi-antenna multi-base station cooperation, so, take base station 202 as example, if the downlink data buffer memory of judging unit 212 judgement subscriber equipmenies 416 is greater than thresholding K, subscriber equipment 416 mode of operation in multi-antenna multi-base station cooperation just.The user who it is pointed out that above-mentioned multi-antenna multi-base station cooperation selects, and is only giving an example that the mode of operation of subscriber equipment is switched, and does not mean that the present invention needs above-mentioned restrictive condition in implementation process.
Step 505: the descending control signaling transmitting element 213 of serving BS is used descending control signaling to send configuration information, to subscriber equipment is configured.
Preferably, the configuration information of described descending control signaling at least comprises, the community number of cooperation base station, the transmission means of downlink data.
Preferably, the configuration information of described descending control signaling at least comprises: the community number of cooperation base station, antenna configuration.
In the present embodiment, provide four applicating examples.
Example one: the configuration information of the descending control signaling that serving BS sends, comprise the community number of cooperation base station, the transmission means of downlink data, it implements schematic diagram as shown in Figure 5.In Fig. 5, the serving BS of subscriber equipment 416 is base station 202, and establishing its cooperation base station is 200He base station, base station 204.The transmission means of supposing the downlink data of cooperation base station 200 is transmit diversity; The transmission means of the downlink data of cooperation base station 204 is the open loop space division multiplexing of individual layer.So serving BS 202, by descending control signaling 600, sends to subscriber equipment 416 configuration information, comprises 204 community, 200He base station, base station number, and the transmission means of the downlink data of 200He base station, base station 204.
Example two: the configuration information of the descending control signaling that serving BS sends, comprise the community number of cooperation base station, the transmission means of downlink data, antenna configuration, it implements schematic diagram as shown in Figure 6.In Fig. 6, the serving BS of subscriber equipment 416 is base station 202, and establishing its cooperation base station is 200He base station, base station 204.The transmission means of supposing the downlink data of cooperation base station 200 is the precoding of closed loop individual layer, and antenna configuration is 4 transmit antennas; The transmission means of the downlink data of cooperation base station 204 is beam forming transmitting, and antenna configuration is 4 transmit antennas.So, serving BS 202 is by descending control signaling 620, the configuration information of multi-antenna multi-base station method is sent to subscriber equipment 416, comprise 204 community, 200He base station, base station number, and the transmission means of the downlink data of 200He base station, base station 204, the in addition antenna configuration of 200He base station, base station 204.
Example three: the configuration information of the descending control signaling that serving BS sends, comprise the community number of cooperation base station, antenna configuration, it implements schematic diagram as shown in Figure 7.In Fig. 7, the serving BS of subscriber equipment 416 is base station 202, and establishing its cooperation base station is 200He base station, base station 204.Suppose the transmission means of the downlink data of cooperation base station 200 and cooperation base station 204, be defaulted as identically with the transmission means of the downlink data of serving BS 202, be the precoding of closed loop individual layer.So the transmission means of the downlink data of cooperation base station does not need to inform subscriber equipment 416.In addition, the antenna configuration of cooperation base station 200 and cooperation base station 204 is 4 transmit antennas.So serving BS 202, by descending control signaling 640, sends to subscriber equipment 416 the configuration information of multi-antenna multi-base station method, comprises 204 community, 200He base station, base station number, and the antenna configuration of 200He base station, base station 204.
Example four: the configuration information of the descending control signaling that serving BS sends, comprise the community number of cooperation base station, antenna configuration, it implements schematic diagram as shown in Figure 8.In Fig. 8, the serving BS of subscriber equipment 416 is base station 202, and establishing its cooperation base station is 200He base station, base station 204.Suppose the transmission means of the downlink data of cooperation base station 200 and cooperation base station 204, be defaulted as identically with the transmission means of the downlink data of serving BS 202, be the multiuser MIMO of individual layer, and subscriber equipment 416,410,430 forms multi-user's group.So the transmission means of the downlink data of cooperation base station does not need to inform subscriber equipment 416.In addition, the antenna configuration of cooperation base station 200 and cooperation base station 204 is 4 transmit antennas.So serving BS 202, by descending control signaling 660, sends to subscriber equipment 416 the configuration information of multi-antenna multi-base station method, comprises 204 community, 200He base station, base station number, and the antenna configuration of 200He base station, base station 204.
Example one herein to example four be only the present invention for the embodiment of the configuration information of the descending control signaling of serving BS, and do not mean that the present invention is confined to example one to the form of example four for the configuration information of the descending control signaling of serving BS.
Step 510: subscriber equipment is the configuration to it based on serving BS, obtains the system information of serving BS and each cooperation base station and to the resource of subscriber equipment, distributes the channel condition information of required down channel from serving BS and cooperation base station.
Preferably, the system information of described subscriber equipment acquisition serving BS and each cooperation base station at least comprises antenna configuration.
Preferably, described subscriber equipment obtains the system information of serving BS and each cooperation base station and the channel condition information that resource is distributed required down channel is, subscriber equipment obtains the system information of serving BS by the broadcast channel of serving BS, subscriber equipment obtains the system information of each cooperation base station by the broadcast channel of each cooperation base station.
Preferably, system information and channel condition information that described subscriber equipment obtains serving BS and each cooperation base station are, subscriber equipment obtains the system information of serving BS by the broadcast channel of serving BS, subscriber equipment obtains the system information of each cooperation base station by the configuration information of the descending control signaling of step 505.
After subscriber equipment obtains the system information of serving BS and each cooperation base station, just can detect the downlink reference signal of serving BS and each cooperation base station, thereby obtain the channel condition information of serving BS and each cooperation base station.
In the present embodiment, provide four applicating examples.
Example one: subscriber equipment obtains the system information of serving BS by the broadcast channel of serving BS, at least comprise antenna configuration, and subscriber equipment obtains the system information of each cooperation base station by the broadcast channel of each cooperation base station, at least comprise antenna configuration.Then, subscriber equipment, by the downlink reference signal of serving BS and each cooperation base station, obtains the channel condition information of serving BS and each cooperation base station, and it implements schematic diagram as shown in Figure 5.In Fig. 5, the serving BS of subscriber equipment 416 is base station 202, and establishing its cooperation base station is 200He base station, base station 204.The transmission means of supposing the downlink data of cooperation base station 200 is transmit diversity; The transmission means of the downlink data of cooperation base station 204 is the open loop space division multiplexing of individual layer.Generally speaking, subscriber equipment 416 obtains the system information of serving BS by the broadcast channel of serving BS 202, and the antenna configuration that at least comprises base station 202 is 4 transmit antennas, and this is the necessary step in cellular communication, at this, is not described further.In Fig. 5, subscriber equipment 416, by receiving the broadcast channel (being illustrated as dotted line 602) of base station 200, obtains the system information of base station 200, and the antenna configuration that at least comprises base station 200 is 4 transmit antennas; By receiving the broadcast channel (being illustrated as dotted line 604) of base station 204, obtain the system information of base station 204, the antenna configuration that at least comprises base station 204 is 4 transmit antennas.Then, subscriber equipment 416, by detecting the downlink reference signal of serving BS 202 and each 200Ji base station, cooperation base station 204, obtains the channel condition information (being illustrated as the testing process 606 of reference signal) of serving BS and each cooperation base station.
Example two: subscriber equipment obtains the system information of serving BS by the broadcast channel of serving BS, at least comprise antenna configuration, subscriber equipment obtains the system information of each cooperation base station by the configuration information of the descending control signaling of step 505, at least comprise antenna configuration.Then, subscriber equipment, by the downlink reference signal of serving BS and each cooperation base station, obtains the channel condition information of serving BS and each cooperation base station, and it implements schematic diagram as shown in Figure 6.In Fig. 6, the serving BS of subscriber equipment 416 is base station 202, and establishing its cooperation base station is 200He base station, base station 204.The transmission means of supposing the downlink data of cooperation base station 200 is the precoding of closed loop individual layer, and antenna configuration is 4 transmit antennas; The transmission means of the downlink data of cooperation base station 204 is beam forming transmitting, and antenna configuration is 4 transmit antennas.Generally speaking, subscriber equipment 416 obtains the system information of serving BS by the broadcast channel of serving BS 202, and the antenna configuration that at least comprises base station 202 is 4 transmit antennas, and this is the necessary step in cellular communication, at this, is not described further.In Fig. 6, subscriber equipment 416 obtains the system information of 200He base station, base station 204 by the configuration information (in 620) of the descending control signaling of step 505, and the antenna configuration that at least comprises 200He base station, base station 204 is 4 transmit antennas.Then, subscriber equipment 416, by detecting the downlink reference signal of serving BS 202 and each 200Ji base station, cooperation base station 204, obtains the channel condition information (being illustrated as the testing process 606 of reference signal) of serving BS and each cooperation base station.
Example three: subscriber equipment obtains the system information of serving BS by the broadcast channel of serving BS, at least comprise antenna configuration, subscriber equipment obtains the system information of each cooperation base station by the configuration information of the descending control signaling of step 505, at least comprise antenna configuration.Then, subscriber equipment, by the downlink reference signal of serving BS and each cooperation base station, obtains the channel condition information of serving BS and each cooperation base station, and it implements schematic diagram as shown in Figure 7.In Fig. 7, the serving BS of subscriber equipment 416 is base station 202, and establishing its cooperation base station is 200He base station, base station 204.Suppose the transmission means of the downlink data of cooperation base station 200 and cooperation base station 204, be defaulted as identically with the transmission means of the downlink data of serving BS 202, be the precoding of closed loop individual layer.In addition, the antenna configuration of cooperation base station 200 and cooperation base station 204 is 4 transmit antennas.Generally speaking, subscriber equipment 416 obtains the system information of serving BS by the broadcast channel of serving BS 202, and the antenna configuration that at least comprises base station 202 is 4 transmit antennas, and this is the necessary step in cellular communication, at this, is not described further.In Fig. 7, subscriber equipment 416 obtains the system information of 200He base station, base station 204 by the configuration information (in 640) of the descending control signaling of step 505, and the antenna configuration that at least comprises 200He base station, base station 204 is 4 transmit antennas.Then, subscriber equipment 416, by detecting the downlink reference signal of serving BS 202 and each 200Ji base station, cooperation base station 204, obtains the channel condition information (being illustrated as the testing process 606 of reference signal) of serving BS and each cooperation base station.
Example four: subscriber equipment obtains the system information of serving BS by the broadcast channel of serving BS, at least comprise antenna configuration, subscriber equipment obtains the system information of each cooperation base station by the configuration information of the descending control signaling of step 505, at least comprise antenna configuration.Then, subscriber equipment, by the downlink reference signal of serving BS and each cooperation base station, obtains the channel condition information of serving BS and each cooperation base station, and it implements schematic diagram as shown in Figure 8.In Fig. 8, the serving BS of subscriber equipment 416 is base station 202, and establishing its cooperation base station is 200He base station, base station 204.Suppose the transmission means of the downlink data of cooperation base station 200 and cooperation base station 204, be defaulted as identically with the transmission means of the downlink data of serving BS 202, be the multiuser MIMO of individual layer, and subscriber equipment 416,410,430 forms multi-user's group.In addition, the antenna configuration of cooperation base station 200 and cooperation base station 204 is 4 transmit antennas.Generally speaking, subscriber equipment 416 obtains the system information of serving BS by the broadcast channel of serving BS 202, and the antenna configuration that at least comprises base station 202 is 4 transmit antennas, and this is the necessary step in cellular communication, at this, is not described further.In Fig. 7, subscriber equipment 416 obtains the system information of 200He base station, base station 204 by the configuration information (in 660) of the descending control signaling of step 505, and the antenna configuration that at least comprises 200He base station, base station 204 is 4 transmit antennas.Then, subscriber equipment 416, by detecting the downlink reference signal of serving BS 202 and each 200Ji base station, cooperation base station 204, obtains the channel condition information (being illustrated as the testing process 606 of reference signal) of the down channel of serving BS and each cooperation base station.
Example one herein to example four is only that the present invention obtains serving BS and the system information of each cooperation base station and the embodiment of channel condition information for subscriber equipment, and does not mean that each cooperation base station of system information and channel condition information the present invention obtains serving BS and to(for) subscriber equipment are confined to example one to the form of example four.
Step 515: the channel condition information of the down channel that subscriber equipment feedback resource allocation is required;
Preferably, described subscriber equipment only feeds back the channel condition information of serving BS and each cooperation base station to serving BS.
Preferably, described subscriber equipment, respectively to serving BS and each cooperation base station, feeds back the channel condition information of serving BS and each cooperation base station.
In the present embodiment, provide four applicating examples.
Example one: subscriber equipment only feeds back the channel condition information of the down channel of serving BS and each cooperation base station to serving BS, it implements schematic diagram as shown in Figure 5.In Fig. 5, the serving BS of subscriber equipment 416 is base station 202, and establishing its cooperation base station is 200He base station, base station 204.The transmission means of supposing the downlink data of serving BS 202 is the precoding of closed loop individual layer, and the transmission means of the downlink data of cooperation base station 200 is transmit diversity; The transmission means of the downlink data of cooperation base station 204 is the open loop space division multiplexing of individual layer.Because the transmission means of the downlink data of cooperation base station 200 and cooperation base station 204 does not need the channel condition information of user feedback down channel.So 416 of subscriber equipmenies need send to the channel condition information of serving BS 202 serving BS 202 (being illustrated as feedback procedure 700).
Example two: subscriber equipment is the channel condition information with the down channel of each cooperation base station feedback serving BS and each cooperation base station to serving BS respectively, and it implements schematic diagram as shown in Figure 6.In Fig. 6, the serving BS of subscriber equipment 416 is base station 202, and establishing its cooperation base station is 200He base station, base station 204.The transmission means of supposing the downlink data of serving BS 202 is transmit diversity, and the transmission means of the downlink data of cooperation base station 200 is the precoding of closed loop individual layer; The transmission means of the downlink data of cooperation base station 204 is beam forming transmitting.Because the transmission means of the downlink data of serving BS 202 does not need the channel condition information of user feedback down channel.So subscriber equipment 416 need to send to the channel condition information of the down channel of cooperation base station 200 and cooperation base station 204 respectively cooperation base station 200 and cooperation base station 204 (being illustrated as respectively feedback procedure 710 and 712).
Example three: subscriber equipment is the channel condition information with the down channel of each cooperation base station feedback serving BS and each cooperation base station to serving BS respectively, and it implements schematic diagram as shown in Figure 7.In Fig. 7, the serving BS of subscriber equipment 416 is base station 202, and establishing its cooperation base station is 200He base station, base station 204.Suppose the transmission means of the downlink data of cooperation base station 200 and cooperation base station 204, be defaulted as identically with the transmission means of the downlink data of serving BS 202, be the precoding of closed loop individual layer.Due to serving BS 202, the transmission means of the downlink data of cooperation base station 200 and cooperation base station 204 all needs the channel condition information of user feedback down channel.So, subscriber equipment 416 need to be by serving BS 202, the channel condition information of the down channel of cooperation base station 200 and cooperation base station 204 sends to respectively serving BS 202, cooperation base station 200 and cooperation base station 204 (being illustrated as respectively feedback procedure 720,722 and 724).
Example four: subscriber equipment only feeds back the channel condition information of the down channel of serving BS and each cooperation base station to serving BS, it implements schematic diagram as shown in Figure 8.In Fig. 8, the serving BS of subscriber equipment 416 is base station 202, and establishing its cooperation base station is 200He base station, base station 204.Suppose the transmission means of the downlink data of cooperation base station 200 and cooperation base station 204, be defaulted as identically with the transmission means of the downlink data of serving BS 202, be the multiuser MIMO of individual layer, and subscriber equipment 416,410,430 forms multi-user's group.Due to serving BS 202, the transmission means of the downlink data of cooperation base station 200 and cooperation base station 204 all needs the channel condition information of user feedback down channel.So subscriber equipment 416 need to be by serving BS 202, the channel condition information of the down channel of cooperation base station 200 and cooperation base station 204 sends to serving BS 202 (being illustrated as feedback procedure 730).
Example one herein to example four is only the present invention for the embodiment of the channel condition information of the down channel of subscriber equipment feedback serving BS and each cooperation base station, and does not mean that the present invention is confined to example one to the form of example four for the channel condition information of the down channel of subscriber equipment feedback serving BS and each cooperation base station.
Step 520: the Resource Scheduler 214 of serving BS obtains serving BS and the channel condition information of each cooperation base station to the down channel of subscriber equipment, carries out scheduling of resource and background communication, sends scheduling of resource result and downlink communication data to cooperation base station;
Preferably, described serving BS, by the feedback of subscriber equipment, obtains the channel condition information that resource is distributed required down channel.
Preferably, each cooperation base station is given described serving BS the channel condition information of serving BS required down channel in resource is distributed by background transfer.
Preferably, in described background communication, comprise serving BS and send data to each cooperation base station, described data at least comprise, scheduling of resource result, downlink communication data.
In the present embodiment, provide four applicating examples.
Example one: serving BS, by the feedback of subscriber equipment, obtains the channel condition information that resource is distributed required down channel, and it implements schematic diagram as shown in Figure 5.In Fig. 5, the serving BS of subscriber equipment 416 is base station 202, and establishing its cooperation base station is 200He base station, base station 204.The transmission means of supposing the downlink data of serving BS 202 is the precoding of closed loop individual layer, and the transmission means of the downlink data of cooperation base station 200 is transmit diversity; The transmission means of the downlink data of cooperation base station 204 is the open loop space division multiplexing of individual layer.Subscriber equipment 416 sends to serving BS 202 (feedback procedure 700) by the channel condition information of the down channel of serving BS 202.So serving BS 202, by the feedback of subscriber equipment, obtains the channel condition information that resource is distributed required down channel.When serving BS 202 completes after scheduling of resource, serving BS 202 is by background communication (X2 interface 300 and 304), and to major general's scheduling of resource result, downlink communication data send to cooperation base station 200 and cooperation base station 204.
Example two: each cooperation base station is given described serving BS the channel condition information of serving BS required down channel in resource is distributed by background transfer, it implements schematic diagram as shown in Figure 6.In Fig. 6, the serving BS of subscriber equipment 416 is base station 202, and establishing its cooperation base station is 200He base station, base station 204.The transmission means of supposing the downlink data of serving BS 202 is transmit diversity, and the transmission means of the downlink data of cooperation base station 200 is the precoding of closed loop individual layer; The transmission means of the downlink data of cooperation base station 204 is beam forming transmitting.Subscriber equipment 416 need to send to the channel condition information of the down channel of cooperation base station 200 and cooperation base station 204 respectively cooperation base station 200 and cooperation base station 204 (feedback procedure 710 and 712).Then, cooperation base station 200 and cooperation base station 204 are the feedback information of subscriber equipment 416, and the channel condition information of serving BS 202 required down channel in resource is distributed, is transferred to serving BS 202 by backstage (X2 interface 300 and 304).When serving BS 202 completes after scheduling of resource, serving BS 202 is by background communication (X2 interface 300 and 304), and to major general's scheduling of resource result, downlink communication data send to cooperation base station 200 and cooperation base station 204.
Example three: each cooperation base station is given described serving BS the channel condition information of serving BS required down channel in resource is distributed by background transfer, it implements schematic diagram as shown in Figure 7.In Fig. 7, the serving BS of subscriber equipment 416 is base station 202, and establishing its cooperation base station is 200He base station, base station 204.Suppose the transmission means of the downlink data of cooperation base station 200 and cooperation base station 204, be defaulted as identically with the transmission means of the downlink data of serving BS 202, be the precoding of closed loop individual layer.Subscriber equipment 416 need to be by serving BS 202, and the channel condition information of the down channel of cooperation base station 200 and cooperation base station 204 sends to respectively serving BS 202, cooperation base station 200 and cooperation base station 204 (feedback procedure 720,722 and 724).Then, cooperation base station 200 and cooperation base station 204 are the feedback information of subscriber equipment 416, and the channel condition information of serving BS 202 required down channel in resource is distributed, is transferred to serving BS 202 by backstage (X2 interface 300 and 304).When serving BS 202 completes after scheduling of resource, serving BS 202 is by background communication (X2 interface 300 and 304), and to major general's scheduling of resource result, downlink communication data send to cooperation base station 200 and cooperation base station 204.
Example four: serving BS, by the feedback of subscriber equipment, obtains the channel condition information that resource is distributed required down channel, and it implements schematic diagram as shown in Figure 8.In Fig. 8, the serving BS of subscriber equipment 416 is base station 202, and establishing its cooperation base station is 200He base station, base station 204.Suppose the transmission means of the downlink data of cooperation base station 200 and cooperation base station 204, be defaulted as identically with the transmission means of the downlink data of serving BS 202, be the multiuser MIMO of individual layer, and subscriber equipment 416,410,430 forms multi-user's group.Subscriber equipment 416 need to be by serving BS 202, and the channel condition information of the down channel of cooperation base station 200 and cooperation base station 204 sends to serving BS 202 (feedback procedure 730).So serving BS 202, by the feedback of subscriber equipment, obtains the channel condition information that resource is distributed required down channel.When serving BS 202 completes after scheduling of resource, serving BS 202 is by background communication (X2 interface 300 and 304), and to major general's scheduling of resource result, downlink communication data send to cooperation base station 200 and cooperation base station 204.
Example one herein to example four is only that the present invention obtains serving BS and the channel condition information of each cooperation base station to the down channel of subscriber equipment for serving BS, carry out the embodiment of scheduling of resource and background communication, and do not mean that the present invention obtains serving BS and the channel condition information of each cooperation base station to the down channel of subscriber equipment for serving BS, carries out scheduling of resource and background communication and is confined to example one to the form of example four.
Step 525: by descending air interface, send the distribution indication of downlink resource to subscriber equipment from the distribution indication transmitting element 215 of serving BS or cooperation base station;
Preferably, described serving BS sends the distribution indication of downlink resource to subscriber equipment, and described distribution indication at least comprises that the frequency location of downlink resource, serving BS send the precoding information that data need be used.
Preferably, described serving BS sends the distribution indication of downlink resource to subscriber equipment, described distribution indication at least comprises that the frequency location of downlink resource, serving BS send the precoding information that data need be used, and each cooperation base station sends the precoding information that data need be used.
Preferably, described serving BS and each cooperation base station send respectively the distribution indication of downlink resource to subscriber equipment, and described distribution indication at least comprises that the frequency location of downlink resource, base station send the precoding information that data need be used.
In the present embodiment, provide four applicating examples.
Example one: described serving BS sends the distribution indication of downlink resource to subscriber equipment, described distribution indication at least comprises that the frequency location of downlink resource, serving BS send the precoding information that data need be used, it implements schematic diagram as shown in Figure 5.In Fig. 5, the serving BS of subscriber equipment 416 is base station 202, and establishing its cooperation base station is 200He base station, base station 204.The transmission means of supposing the downlink data of serving BS 202 is the precoding of closed loop individual layer, and the transmission means of the downlink data of cooperation base station 200 is transmit diversity; The transmission means of the downlink data of cooperation base station 204 is the open loop space division multiplexing of individual layer, and serving BS is launched identical single layer data with cooperation base station, the space diversity between formation base station.Yi Zhi, the effect here of cooperation base station, is the auxiliary quality of reception that serving BS transmits that improves, so cooperation base station does not send the precoding information of data.So serving BS 202 sends the distribution indication (indicating 608) of downlink resource to subscriber equipment 416, comprise that the frequency location of downlink resource, serving BS 202 send the precoding information that data need be used.
Example two: described serving BS and each cooperation base station send respectively the distribution indication of downlink resource to subscriber equipment, described distribution indication at least comprises that the frequency location of downlink resource, base station send the precoding information that data need be used.It implements schematic diagram as shown in Figure 6.In Fig. 6, the serving BS of subscriber equipment 416 is base station 202, and establishing its cooperation base station is 200He base station, base station 204.The transmission means of supposing the downlink data of serving BS 202 is transmit diversity, and the transmission means of the downlink data of cooperation base station 200 is the precoding of closed loop individual layer; The transmission means of the downlink data of cooperation base station 204 is beam forming transmitting, and serving BS is launched identical single layer data with cooperation base station, the space diversity between formation base station.Yi Zhi, there is the precoding information that sends data cooperation base station.So, serving BS 202, cooperation base station 200 and cooperation base station 204 respectively to subscriber equipment 416 send downlink resources distribution indication (indicate 624, indicate 628 and indication 626), the frequency location, the base station 200,202 and 204 that comprise downlink resource send the precoding information that data need be used.
Example three: described serving BS sends the distribution indication of downlink resource to subscriber equipment, described distribution indication at least comprises that the frequency location of downlink resource, serving BS send the precoding information that data need be used, and each cooperation base station sends the precoding information that data need be used.It implements schematic diagram as shown in Figure 7.In Fig. 7, the serving BS of subscriber equipment 416 is base station 202, and establishing its cooperation base station is 200He base station, base station 204.Suppose the transmission means of the downlink data of cooperation base station 200 and cooperation base station 204, be defaulted as identical with the transmission means of the downlink data of serving BS 202, be the precoding of closed loop individual layer, and serving BS is launched different single layer data from cooperation base station, the spatial reuse between formation base station.Yi Zhi, there is the precoding information that sends data serving BS and cooperation base station.So, serving BS 202 sends the distribution indication (indicating 644) of downlink resource to subscriber equipment 416, the frequency location, the serving BS 202 that comprise downlink resource send the precoding information that data need be used, and cooperation base station 200 and cooperation base station 204 send the precoding information that data need be used.
Example four: described serving BS sends the distribution indication of downlink resource to subscriber equipment, described distribution indication at least comprises that the frequency location of downlink resource, serving BS send the precoding information that data need be used, each cooperation base station sends the precoding information that data need be used, and it implements schematic diagram as shown in Figure 8.In Fig. 8, the serving BS of subscriber equipment 416 is base station 202, and establishing its cooperation base station is 200He base station, base station 204.Suppose the transmission means of the downlink data of cooperation base station 200 and cooperation base station 204, be defaulted as identically with the transmission means of the downlink data of serving BS 202, be the multiuser MIMO of individual layer, and subscriber equipment 416,410,430 forms multi-user's group.For same user, its serving BS is launched identical single layer data with cooperation base station, forms the space diversity between base station.Yi Zhi, there is the precoding information that sends data serving BS and cooperation base station.So, serving BS 202 sends the distribution indication (indicating 664) of downlink resource to subscriber equipment 416, the frequency location, the serving BS 202 that comprise downlink resource send the precoding information that data need be used, and cooperation base station 200 and cooperation base station 204 send the precoding information that data need be used; Serving BS 200 sends the distribution indication (indicating 668) of downlink resource to subscriber equipment 410, the frequency location, the serving BS 200 that comprise downlink resource send the precoding information that data need be used, and cooperation base station 202 and cooperation base station 204 send the precoding information that data need be used; Serving BS 204 sends the distribution indication (indicating 666) of downlink resource to subscriber equipment 430, the frequency location, the serving BS 204 that comprise downlink resource send the precoding information that data need be used, and cooperation base station 200 and cooperation base station 202 send the precoding information that data need be used.
Example one herein to example four is only that the present invention obtains the embodiment of the distribution indication of downlink resource for subscriber equipment, and does not mean that the distribution indication that the present invention obtains downlink resource for subscriber equipment is confined to example one to the form of example four.
So far invention has been described in conjunction with the preferred embodiments.Should be appreciated that, those skilled in the art without departing from the spirit and scope of the present invention, can carry out various other change, replacement and interpolations.Therefore, scope of the present invention is not limited to above-mentioned specific embodiment, and should be limited by claims.
Claims (5)
1. with the serving BS of mobile communications, described serving BS comprises:
Transmitter, is configured to send downlink reference signal and the downgoing control signal from described serving BS to described travelling carriage,
Wherein, described downgoing control signal comprises: the cell identity information of other base stations except described serving BS and the information that is illustrated in the quantity of the antenna port of locating described other base stations except described serving BS, described downgoing control signal is the special signal of described travelling carriage.
2. serving BS according to claim 1, also comprises:
Receiver, is configured to receive the described information of quantity and the channel condition information relevant to described serving BS of described downlink reference signal generation that is used described cell identity information, expression antenna port by described travelling carriage.
3. a travelling carriage of communicating by letter with serving BS, described travelling carriage comprises:
Receiver, is configured to receive at described travelling carriage place downlink reference signal and the downgoing control signal from described serving BS,
Wherein, described downgoing control signal comprises: the cell identity information of other base stations except described serving BS and the information that is illustrated in the quantity of the antenna port of locating described other base stations except described serving BS, described downgoing control signal is the special signal of described travelling carriage.
4. travelling carriage according to claim 3, also comprises:
Generator, is configured to use described cell identity information, represents that described information and the described downlink reference signal of the quantity of antenna port produce the channel condition information relevant to described serving BS,
Transmitter, is configured to send described channel condition information to described serving BS.
5. for a communication means for the serving BS with mobile communications, described communication means comprises:
To described travelling carriage, send downlink reference signal and the downgoing control signal from described serving BS,
Wherein, described downgoing control signal comprises: the cell identity information of other base stations except described serving BS and the information that is illustrated in the quantity of the antenna port of locating described other base stations except described serving BS, described downgoing control signal is the special signal of described travelling carriage.
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Application publication date: 20140205 |