CN101883402A - Cooperative data transmission method and system - Google Patents
Cooperative data transmission method and system Download PDFInfo
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- CN101883402A CN101883402A CN2009101070725A CN200910107072A CN101883402A CN 101883402 A CN101883402 A CN 101883402A CN 2009101070725 A CN2009101070725 A CN 2009101070725A CN 200910107072 A CN200910107072 A CN 200910107072A CN 101883402 A CN101883402 A CN 101883402A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
- H04B17/24—Monitoring; Testing of receivers with feedback of measurements to the transmitter
Abstract
The invention discloses a cooperative data transmission method and a cooperative data transmission system. In the scheme of the invention, a service base station judges whether a user needing cooperative transmission exists or not according to channel quality information fed back by the user, if so, the service base station builds a cooperative group, a service gateway transmits downlink service data to cooperative group members through an S1 interface according to information uploaded by the service base station and the cooperative group members transmit obtained downlink service data to the cooperative user through an X2 interface. The method and the system have the advantages of solving the problem of downlink service data in cooperative transmission, allowing the service base station and each cooperative base station to obtain the downlink service data of the cooperative user, performing cooperative transmission on the cooperative user, meeting the requirement on downlink data distribution in a joint processing mode, adding additional processing for an access network side or improving gateway capability without causing any effect on the service distribution of non-cooperative users.
Description
Technical field
The present invention relates to the communications field, particularly, relate to a kind of method and system of cooperative data transmission.
Background technology
Along with LTE-A (Long-Term Evolution Advanced, abbreviate LTE-A as) proposition of demand, people more and more pay attention to sub-district average spectral efficiency (ase) and cell edge spectrum efficiency, comparatively speaking, the spectrum efficiency of cell edge is paid close attention to by people most, this mainly is because the provisional capital up and down of LTE-A system is with OFDM (Orthogonal Frequency Division Multiplexing, abbreviate OFDM as) (perhaps with certain distortion of the OFDM) be the frequency division systems of basic multiple access multiplexing mode, with traditional with CDMA (Code-Division Multiple Access, abbreviate CDMA as) for the wireless communication system difference of basic multiple access multiplexing mode, the LTE-A system does not have processing gain, the sub-district is inner because complete frequency division quadrature, so almost do not have interference problem, but handle thorny relatively in the interference at cell edge place.The antenna distance of a plurality of neighbor cells of Cell Edge User distance is more or less the same, and is vulnerable to most disturb and influences performance.If the different antennae that can utilize a plurality of sub-districts provides service simultaneously for the user of cell edge, then not only avoided the interference of minizone, can also give full play to the information that many antennas increase the space dimension, make the capacity of system and performance be increased dramatically.
Collaborative multicast communication is proposed under this background just.The different antennae that a plurality of sub-districts are used in collaborative multicast communication provides service simultaneously as the user of cell edge, so not only avoided the interference of minizone, simultaneously owing to adopt multi-antenna technology, can give full play to many antennas increases the information of space dimension, makes that the capacity of system and performance are significantly promoted.Certainly collaborative multicast communication also is not limited to the minizone, in the sub-district, can use equally, because the emission of user profile spatially is separated into a plurality of transmission points, these transmission points are worked in coordination again, can realize power, the best configuration of frequency and space resources, thus can realize inhibition to disturbing, can realize the link performance of reliable and high power capacity again.
In the collaborative multicast communication, constitute a coordinated groups by plurality of nodes usually, provide cooperation transmission for Cell Edge User jointly.In the coordinated groups, user's service node is generally host node, has determined whether the user to be worked in coordination with transmission coordinated groups member's selection, the scheduling of collaborative resource, the choice of cooperative mode etc.Other nodes in the coordinated groups are cooperative nodes, participate in scheduling with the identity from node.
With regard to cooperative mode, currently to reach common understanding, cooperative mode can be divided into two big classes:
The first kind is a Combined Treatment, is united by a plurality of nodes that participate in working in coordination with the collaborative user is sent downlink data, and unites the upstream data that receives the collaborative user, and promptly each member all participates in transfer of data in the coordinated groups.
Second class is a cooperative scheduling, each node cooperation carries out scheduling of resource, channel information according to service node and each cooperative node carries out the comprehensive resources scheduling, reduce the interference that the user is subjected to, but the actual node that sends, receives data has only one, this pattern can be regarded a kind of disturbance coordination method of enhancing as, only the user is transmitted by the service node in the coordinated groups, cooperative nodes in the coordinated groups participates in scheduling, by the combined dispatching of service node, cooperative nodes, realize interference coordination.
Can find out from above two kinds of cooperative modes, service node and each cooperative nodes all need to obtain collaborative user's downlink data in the Combined Treatment mode, and Service Gateway only issues user's downlink data to user's service node among the current LTE, does not have therefore to consider that the downlink data that how to satisfy the Combined Treatment mode distributes requirement.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of method and system of multipoint cooperative transmission, distributes requirement to solve the downlink data that how to satisfy the Combined Treatment mode in the prior art.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of method of multipoint cooperative transmission, the method of being somebody's turn to do, comprise: serving BS is according to the channel quality information of user feedback, judge whether to have the user who needs collaborative transmission, if have, then serving BS is set up coordinated groups, the information that Service Gateway is uploaded according to described serving BS, downlink service data is handed down to described coordinated groups, and described coordinated groups is handed down to described collaborative user with the downlink service data that obtains;
Wherein, described judge whether to have need the user of collaborative transmission specifically to refer to: described serving BS is according to the channel quality information of user feedback and the collaborative thresholding comparison of setting, when the channel quality information of feedback is less than or equal to collaborative thresholding, then described user is worked in coordination with transmission, described user becomes the user of described collaborative transmission;
Wherein, described serving BS is set up coordinated groups and specifically referred to: the candidate that serving BS is selected from adjacent base station works in coordination with the base station, and to the collaborative request of this candidate collaborative base station transmission, after the collaborative base station of described candidate receives collaborative request, determine whether to feed back the affirmation information of collaborative request to described serving BS according to the own resource distribution condition, described serving BS is determined described collaborative user's coordinated groups according to the affirmation information that receives.
Preferably, described coordinated groups comprises described serving BS and at least one collaborative base station;
Preferably, the information uploaded of described serving BS comprises coordinated groups information and control signaling;
Further, described Service Gateway issues user's downlink service data for serving BS and collaborative base station, and described collaborative user is handed down to described downlink service data in described serving BS and collaborative base station;
Further, described Service Gateway issues user's downlink service data for collaborative base station, and described collaborative user is handed down to described downlink service data in described collaborative base station;
Preferably, the information uploaded of described serving BS comprises the control signaling.
Further, described Service Gateway issues collaborative user's downlink service data for described serving BS, and described serving BS is passed to collaborative base station with downlink service data, and coordinated groups is handed down to described collaborative user with described downlink service data;
Preferably, after described serving BS was determined described coordinated groups, described coordinated groups was carried out the federated resource scheduling, serving BS is main, and collaborative base station is auxilliary, by the concrete scheduling of described serving BS decision, determine to give collaborative user's downlink resource and modulation coding mode, simultaneously the collaborative base station of notice;
Above-mentioned described collaborative user is carried out specifically finger of downlink service data transmission, the data retransmission of subframe n or new data are eated dishes without rice or wine to pass to the collaborative user by antenna.
A kind of system of cooperative data transmission comprises, transceiver module, service module, cooperative module, collaborative user;
Described service module, channel quality information according to user feedback, judge whether to have the user who needs collaborative transmission, if have, then service module is set up coordinated groups, with the information uploading transceiver module, described coordinated groups member will receive the downlink service data that described transceiver module issues and be handed down to described collaborative user;
Described transceiver module, the information according to described service module is uploaded is handed down to described coordinated groups member with downlink service data, and described coordinated groups member is handed down to described collaborative user with the downlink service data that obtains;
Described cooperative module receives collaborative user's downlink service data that described service module or described transceiver module issue;
Described collaborative user is uploaded to described service module with channel quality information, receives collaborative user's downlink service data that described service module or described cooperative module issue;
Wherein, described service module also comprises judging unit, be used to judge whether to have the user of the collaborative transmission of needs, compare according to the channel quality information of user feedback and the collaborative thresholding of setting, when the channel quality information of feedback is less than or equal to collaborative thresholding, then described user is worked in coordination with transmission, described user becomes the user of described collaborative transmission;
Wherein, described service module also comprises selected cell, be used for to candidate's cooperative module of selecting from adjacent base station, and to the collaborative request of this candidate's cooperative module transmission, after described candidate's cooperative module receives collaborative request, determine whether to feed back collaborative request confirmation according to the own resource distribution condition and give described selected cell, described selected cell is determined described collaborative user's coordinated groups according to the collaborative confirmation that receives;
Wherein, described service module also comprises control unit, is used for sending collaborative request to all cooperative modules of coordinated groups, and all cooperative modules of described coordinated groups are confirmed the described control module of back feedback; Based on service module, collaborative unit is auxilliary, by the concrete scheduling of described control unit decision, determines to give the downlink resource and the modulation coding mode of collaborative unit, simultaneously the collaborative unit of notice;
Wherein, described service module also comprises the business datum Transmit-Receive Unit, is used for described user collaborative group information is uploaded to transceiver module by the S1 interface; The downlink service data that described transceiver module is issued carries out downlink service data transmission to the collaborative user by X2 interface on identical running time-frequency resource;
Above-mentioned the collaborative user is carried out specifically finger of downlink service data transmission, the data retransmission of subframe n or new data are eated dishes without rice or wine to pass to the collaborative user by antenna.
Beneficial effect
A kind of method and system of cooperative data transmission have been proposed among the present invention, solved the problem that the downlink service data in the collaborative multicast communication exists, make serving BS and each collaborative base station can obtain collaborative user's downlink service data, thereby can work in coordination with transmission to the collaborative user, simultaneously, the downlink data that satisfies the Combined Treatment mode distributes requirement, the Access Network side is increased extra process, perhaps, strengthen the gateway ability, and can non-collaborative user's traffic assignments not had any impact.
Description of drawings
Fig. 1: scheme 1 schematic diagram in the method for cooperative data transmission
Fig. 2: scheme 2 schematic diagrames in the method for cooperative data transmission
Fig. 3: the method flow diagram of cooperative data transmission
Fig. 4: the method process chart of example 1 cooperative data transmission
Fig. 5: the method process chart of example 2,3,4 cooperative data transmissions
Fig. 6: example 5 collaborative system for transmitting scheme 1 structural representations
Fig. 7: example 6 collaborative system for transmitting scheme 2 structural representations
Embodiment
At the method for salary distribution of downlink service data in the collaborative multicast communication, the present invention proposes two kinds of schemes:
Scheme 1 is: serving BS is according to the channel quality information of user feedback, judge whether to have the user who needs collaborative transmission, the candidate who selects from adjacent base station works in coordination with the base station, and to the collaborative request of this candidate collaborative base station transmission, after the collaborative base station of described candidate receives collaborative request, determine whether to feed back the affirmation information of collaborative request to described serving BS according to the own resource distribution condition, described serving BS is according to the affirmation information that receives, determine described collaborative user's coordinated groups, serving BS is uploaded the control signaling, need not to upload coordinated groups information to Service Gateway, Service Gateway is transparent to coordinated groups, issue described collaborative user's downlink service data only for described serving BS, serving BS is passed to collaborative base station to described collaborative user's downlink service data, described coordinated groups member carries out the downlink service data transmission to the collaborative user, continues the downlink service data allocative decision among the current LTE, and the Access Network side is increased extra process.
Scheme 2 is: serving BS is according to the channel quality information of user feedback, judge whether to have the user who needs collaborative transmission, the candidate who selects from adjacent base station works in coordination with the base station, and to the collaborative request of this candidate collaborative base station transmission, after the collaborative base station of described candidate receives collaborative request, determine whether to feed back the affirmation information of collaborative request to described serving BS according to the own resource distribution condition, described serving BS is according to the affirmation information that receives, determine described collaborative user's coordinated groups, serving BS is uploaded to Service Gateway with user's coordinated groups information and control signaling, Service Gateway issues user's downlink service data for all members of described coordinated groups, described coordinated groups member is handed down to described collaborative user with the downlink service data that obtains, change the downlink service data allocative decision among the current LTE, strengthen the gateway ability.
Above-mentioned two kinds of schemes can comprehensively be summarised as the method for a kind of cooperative data transmission as shown in Figure 3, and its step is as follows:
Judging whether to have needs the user of collaborative transmission specifically to refer to: described serving BS compares according to the channel quality information of user feedback and the collaborative thresholding of setting, when the channel quality information of feedback is less than or equal to collaborative thresholding, then described user is worked in coordination with transmission, described user becomes the user of described collaborative transmission;
Selecting collaborative base station to set up coordinated groups from adjacent base station specifically refers to: the candidate that described serving BS is selected from adjacent base station works in coordination with the base station, and to the collaborative request of this candidate collaborative base station transmission, after the collaborative base station of described candidate receives collaborative request, determine whether to feed back the affirmation information of collaborative request to described serving BS according to the own resource distribution condition, described serving BS is determined described collaborative user's coordinated groups according to the affirmation information that receives;
Wherein, coordinated groups comprises described serving BS and at least one collaborative base station.
Wherein, the information that serving BS is uploaded comprises coordinated groups information and control signaling, or the information that serving BS is uploaded comprises the control signaling;
After serving BS is determined described coordinated groups, carry out the federated resource scheduling,, determine to give collaborative user's downlink resource and modulation coding mode, simultaneously the collaborative base station of notice by the concrete scheduling of described serving BS decision;
Described Service Gateway issues user's downlink service data for serving BS and collaborative base station, and described collaborative user is handed down to described downlink service data in described serving BS and collaborative base station;
Perhaps, described Service Gateway issues user's downlink service data for collaborative base station, and described collaborative user is handed down to described downlink service data in described collaborative base station;
Perhaps, described Service Gateway issues user's downlink service data to serving BS, and described serving BS is passed to collaborative base station, and coordinated groups member is handed down to described collaborative user with described downlink service data;
Described the collaborative user is carried out specifically finger of downlink service data transmission, the data retransmission of subframe n or new data are eated dishes without rice or wine to pass to the collaborative user by antenna.
As follows according to the said method application example:
Example 1:
Shown in Figure 1, be the data distributing schematic diagram of scheme 1, the method for scheme 1 is that Service Gateway is not done special processing for collaborative user's data and identical the treating of non-collaborative user's data; Service Gateway is according to serving BS under the user, user data is handed down to this user's serving BS by the S1 interface, thereby serving BS received collaborative user's data and non-collaborative user's data in its service range; For non-collaborative user's data, serving BS is eated dishes without rice or wine to handle the back and is transferred to non-collaborative user by transmitting antenna.
For collaborative user's data, serving BS is at first according to this user's coordinated groups information, user data is passed to other collaborative base stations in the coordinated groups by X2 interface, when serving BS is set up coordinated groups, send collaborative request by serving BS to the collaborative base station of the candidate who from adjacent base station, selects, after the collaborative base station of candidate receives request, determine whether to feed back the collaborative confirmation of collaborative request to serving BS according to the own resource distribution condition, serving BS is according to the collaborative confirmation that receives, determine described collaborative user's coordinated groups, serving BS is uploaded the control signaling, Service Gateway issues described collaborative user's downlink service data for described serving BS, serving BS is passed to collaborative base station to described collaborative user's downlink service data, after all collaborative base stations received that all collaborative user's data and chain of command cooperation control Signalling exchange are finished, coordinated groups member carried out the downlink service data transmission to the collaborative user on identical running time-frequency resource.
According to shown in Figure 4, Service Gateway is passed to user's serving BS to user data by the S1 interface according to the mode of stipulating among the current LTE, supposes, sets in the user data that serving BS receives to comprise the data of user a and the data of user b.
Serving BS is according to the channel quality information of user a, b feedback, the collaborative thresholding that is provided with in advance with system compares, when the channel quality information of feedback is less than or equal to collaborative thresholding, judge that serving BS self can't provide high quality transmission for the user, need work in coordination with transmission to the user, judging user a in view of the above is the collaborative user, need provide transmission for it by a plurality of base stations are collaborative; The user b still only provide transmission by serving BS, is non-collaborative user.
The measurement result that serving BS reports according to user a is selected to constitute coordinated groups by adjacent base station 1, base station 2 and serving BS self and is worked in coordination with transmission for user a jointly.After serving BS is determined the coordinated groups member, send collaborative request to coordinated groups member base station 1, base station 2, serving BS is received the collaborative affirmation of coordinated groups member base station 1, base station 2 in waiting for time delay, thereby serving BS determines to be made of serving BS self, base station 1 and base station 2 coordinated groups of service collaboration user a, and serving BS is main in this coordinated groups, base station 1, base station 2 are auxilliary, unite and carry out scheduling of resource.
In the concrete scheduling process, the resource allocation conditions that serving BS reports according to base station 1, base station 2, and the resource allocation conditions of combination oneself defines 5 time equal free time on these three base stations, the measurement result that reports according to user a again, the channel condition of judging 1,2 o'clock user a of use time is best, satisfies Rule of judgment; Therefore serving BS is determined to give user a time 1,2 scheduling, determine that simultaneously user a uses QPSK (Quadrature Phase Shift Keying on time 1,2, be called for short QPSK, quaternary phase shift keying), 1/3 code rate the best, thereby serving BS is downlink resource and modulation coding mode informing base station 1, base station 2.At the same time, the downlink data of serving BS user a that Service Gateway is issued is also passed to base station 1, base station 2 by X2 interface.
Thereby serving BS, base station 1, base station 2 are passed to collaborative user a to the data retransmission of subframe n or new data according to downlink resource and the modulation coding mode of giving collaborative user a by eating dishes without rice or wine on corresponding time.
And for non-collaborative user b, because of serving BS is determined it not to be worked in coordination with transmission, so serving BS need not the downlink data to other base stations dispatch user b, by serving BS user b independently dispatched, transmits.
In this application example, starting stage user a, b is non-collaborative user, become during with channel, user a becomes the collaborative user after a period of time, because of this example is a scheme 1, user a, whether b is that the collaborative user is transparent to Service Gateway, Service Gateway is only user a, the downlink service data of b is distributed to their serving BS, determine whether that according to user's identity and coordinated groups information the downlink data that needs transmit Service Gateway passes to other coordinated groups member by serving BS, continue the downlink service data allocative decision among the current LTE, the Access Network side is increased extra process.
In the foregoing description, when serving BS was set up coordinated groups, coordinated groups member also comprised serving BS and collaborative base station 2, perhaps, collaborative base station 1 and collaborative base station 2, perhaps at least one collaborative base station, all method that can also be same realizes.
Example 2:
Shown in Figure 2, be the data distributing schematic diagram of scheme 2, the method for scheme 2 is that for non-collaborative user's data, Service Gateway is handed down to this user's serving BS by the S1 interface.And for collaborative user's data, serving BS is judged the collaborative user, the method of setting up coordinated groups is identical with embodiment 1, Service Gateway is handed down to all members in the coordinated groups by the S1 interface, comprise serving BS and each collaborative base station, like this, collaborative user's data have all directly been received from Service Gateway in all base stations in the coordinated groups, thereby no longer need to transmit collaborative user's downlink data between serving BS and collaborative base station, as long as chain of command is interactive cooperation control signaling.After finishing cooperation control Signalling exchange, serving BS and each collaborative base station, perhaps downlink transfer is carried out to the collaborative user in each collaborative base station on identical running time-frequency resource.
Not only to pass to its serving BS to collaborative user's data because of Service Gateway in this programme 2, also will pass to its collaborative base station, therefore need collaborative user's serving BS coordinated groups information notification Service Gateway.
Shown in Fig. 5 flow chart, Service Gateway is passed to user data user's serving BS by the S1 interface according to the mode of stipulating among the current LTE; For the purpose of clear, comprise the data of user a and the data of user b in the user data that the setting serving BS is received.
Serving BS becomes when judging because of channel according to the channel quality information of user a, b feedback, and serving BS self can't need work in coordination with transmission to user a, thereby user a become the collaborative user for user a provides high quality transmission; The user b still only provide transmission by serving BS, still is non-collaborative user.
The measurement result that serving BS reports according to user a is selected to constitute coordinated groups by adjacent base station 1, base station 2 and serving BS self and is worked in coordination with transmission for user a jointly.After serving BS is determined the coordinated groups member, send collaborative request to coordinated groups member base station 1, base station 2, serving BS is received the collaborative affirmation of coordinated groups member base station 1, base station 2 in waiting for time delay, thereby serving BS determines to be made of serving BS self, base station 1 and base station 2 coordinated groups of service collaboration user a.
Serving BS is passed to Service Gateway to the coordinated groups information of user a by the S1 interface, thereby Service Gateway is known serving BS, base station 1, base station 2 and is the coordinated groups information of user a, then receiving that this coordinated groups is no longer before the signaling of service-user a, Service Gateway is distributed to each member base station in the user a coordinated groups to the downstream data traffic of user a, specifically can adopt the multicast mode to realize, guarantee that each member of coordinated groups receives collaborative user's downlink data that Service Gateway issues simultaneously.
Thereby by serving BS is main, base station 1, base station 2 is auxilliary, unite and carry out scheduling of resource, in the concrete scheduling process, serving BS is according to base station 1, the resource allocation conditions that base station 2 reports, and the resource allocation conditions of combination oneself defines 5 time equal free time on these three base stations, according to the channel frequency selectivity characteristic, in time 1,2, user a is best to the channel condition of serving BS on 3, in time 1,2, user a is to base station 1 on 4, the channel condition of base station 2 is best, serving BS is determined time 1, user a is given in 2 scheduling, determine that simultaneously user a is in time 1, use 16QAM on 2, (Quadrature Amplitude Modulation, be called for short QAM, quadrature amplitude modulation) 1/2 code rate the best, thus serving BS is downlink resource and modulation coding mode informing base station 1, base station 2.Final when corresponding, on the resource data retransmission of subframe n or new data are passed to collaborative user a by eating dishes without rice or wine frequently.
And for non-collaborative user b, because of serving BS is determined it not to be worked in coordination with transmission, therefore serving BS need not the coordinated groups information of the relevant user b of informing business gateway, Service Gateway is still passed to serving BS to the downlink service data of user b, by serving BS user b is independently dispatched, transmits.
In this application example, starting stage user a, b is non-collaborative user, become user a during with channel and become the collaborative user, because of this example adopts scheme 2, the coordinated groups information that needs informing business gateway collaborative user, thereby Service Gateway is passed to each member in the coordinated groups simultaneously to collaborative user's follow-up downlink service data, coordinated groups is based on serving BS afterwards, collaborative base station is the auxilliary scheduling of resource of carrying out, common is collaborative user's transmitting downlink data, because of the direct multiple spot of gateway issues, need not mutual collaborative user's downlink data between serving BS and the collaborative base station, change the downlink service data allocative decision among the current LTE, strengthen the gateway ability.
Example 3:
Also adopt scheme 2, data distributing schematic diagram such as Fig. 2, wherein Service Gateway, serving BS, collaborative base station and collaborative user's function are with example 1.
Flow chart as shown in Figure 5, Service Gateway is passed to user's serving BS to user data by the S1 interface according to the mode of stipulating among the current LTE, for the purpose of clear, set in the user data that serving BS receives and comprises the data of user a and the data of user b.
Serving BS becomes when judging because of channel according to the channel quality information of user a, b feedback, and serving BS self can't need work in coordination with transmission to user a, thereby user a become the collaborative user for user a provides high quality transmission; The user b still only provide transmission by serving BS, still is non-collaborative user.
The measurement result that serving BS reports according to user a is selected to constitute coordinated groups by adjacent base station 1, base station 2 and serving BS self and is worked in coordination with transmission for user a jointly.After serving BS is determined the coordinated groups member, need send collaborative request to coordinated groups member base station 1, base station 2, serving BS has been received the collaborative affirmation of base station 1 in waiting for time delay, does not receive the collaborative affirmation of base station 2.Therefore serving BS determines that constituting coordinated groups by serving BS self and base station 1 comes the service for user a.
Serving BS is passed to Service Gateway to the coordinated groups information of user a by the S1 interface, thereby Service Gateway is known serving BS, base station 1 and is the coordinated groups of user a, then receiving that this coordinated groups is no longer before the signaling of service-user a, Service Gateway is handed down to each member in the user a coordinated groups with the downstream data traffic of user a, promptly issues serving BS and base station 1; Specifically can adopt the multicast mode to send, can guarantee that each member of coordinated groups receives collaborative user's downlink data that Service Gateway issues simultaneously.
By serving BS is main, base station 1 is auxilliary, unite and carry out scheduling of resource, in the concrete scheduling process, serving BS is according to base station 1, the resource allocation conditions that base station 2 reports, and the resource allocation conditions of combination oneself defines 5 time equal free time on these three base stations, according to the channel frequency selectivity characteristic, in time 1,2, user a is best to the channel condition of serving BS on 3, in time 1,2, user a is to base station 1 on 4, the channel condition of base station 2 is best, serving BS is determined time 1, user a is given in 2 scheduling, determine that simultaneously user a is in time 1, use 16QAM on 2,1/2 code rate the best, thus serving BS is downlink resource and modulation coding mode informing base station 1; When corresponding, frequently on the resource data retransmission of subframe n or new data are passed to collaborative user a by eating dishes without rice or wine.
And for non-collaborative user b, because of serving BS is determined it not to be worked in coordination with transmission, therefore serving BS need not the coordinated groups information of the relevant user b of informing business gateway, Service Gateway is still passed to serving BS to the downlink service data of user b, by serving BS user b is independently dispatched, transmits.
In this application example, starting stage user a, b is non-collaborative user, become user a during with channel and become the collaborative user, because of this example adopts scheme 2, the coordinated groups information that needs informing business gateway collaborative user, thereby Service Gateway is handed down to each member in the coordinated groups simultaneously to collaborative user's downlink service data, coordinated groups is based on serving BS afterwards, collaborative base station is the auxilliary scheduling of resource of carrying out, transmit downlink service data for the collaborative user jointly, because of the direct multiple spot of gateway issues, need not mutual collaborative user's downlink data between serving BS and the collaborative base station, change the downlink service data allocative decision among the current LTE, strengthen the gateway ability;
Example 4:
Also adopt scheme 2, data distributing schematic diagram such as Fig. 2, wherein Service Gateway, serving BS, collaborative base station and collaborative user's function are with example 1.
Flow chart as shown in Figure 5, Service Gateway is passed to user's serving BS to user data by the S1 interface according to the mode of stipulating among the current LTE, for the purpose of clear, set in the user data that serving BS receives and comprises the data of user a and the data of user b.
Serving BS becomes when judging because of channel according to the channel quality information of user a, b feedback, and serving BS self can't need work in coordination with transmission to user a, thereby user a become the collaborative user for user a provides high quality transmission; The user b still only provide transmission by serving BS, still is non-collaborative user.
The measurement result that serving BS reports according to user a is selected to constitute coordinated groups by adjacent base station 1, base station 2 and serving BS self and is worked in coordination with transmission for user a jointly.After serving BS is determined the coordinated groups member, need send collaborative request to coordinated groups member base station 1, base station 2, serving BS has been received the affirmation information of collaborative request of collaborative affirmation, the base station 2 of base station 1 in waiting for time delay.Therefore serving BS determines that constituting coordinated groups by serving BS self and base station 1 and base station 2 comes the service for user a.
Serving BS is passed to Service Gateway to the coordinated groups information of user a by the S1 interface, thereby Service Gateway is known serving BS, base station 1, base station 2 and is the coordinated groups of user a, then receiving that this coordinated groups is no longer before the signaling of service-user a, Service Gateway is distributed to each member in the user a coordinated groups to the downstream data traffic of user a, promptly issues serving BS and base station 1.Specifically can adopt the multicast mode to send, can guarantee that each member of coordinated groups receives collaborative user's downlink data that Service Gateway issues simultaneously.
By serving BS is main, base station 1, base station 2 are auxilliary, unite and carry out scheduling of resource, in the concrete scheduling process, serving BS does not have to give the user a resource of distribution, and there are 5 time free time base station 1, base station 2, wherein the channel condition of time 1,2 to user a is best, therefore serving BS is determined to give user a time 1,2 scheduling, determine that simultaneously user a uses 16QAM, 1/2 code rate the best on time 1,2, thereby serving BS is downlink resource and modulation coding mode informing base station 1, base station 2.Final when corresponding, by base station 1, base station 2 data retransmission of subframe n or new data are eated dishes without rice or wine to pass to collaborative user a by antenna on the resource frequently.Serving BS is as the main control base station of coordinated groups, and the transmitting-receiving of only dispatching and controlling signaling does not participate in business data transmission.
And for non-collaborative user b, because of serving BS is determined it not to be worked in coordination with transmission, therefore serving BS need not the coordinated groups information of the relevant user b of informing business gateway, Service Gateway is still passed to serving BS to the downlink service data of user b, by serving BS user b is independently dispatched, transmits.
In this application example, starting stage user a, b are non-collaborative user, become user a during with channel and become the collaborative user, because of this example adopts scheme 2, the coordinated groups information that needs informing business gateway collaborative user, thereby Service Gateway is handed down to each member in the coordinated groups simultaneously to collaborative user's downlink service data, and coordinated groups is to assist to carry out scheduling of resource based on serving BS, collaborative base station afterwards, is collaborative user's transmitting downlink data jointly.Because of the direct multiple spot of gateway issues, need not mutual collaborative user's downlink data between serving BS and the collaborative base station, change the downlink service data allocative decision among the current LTE, strengthen the gateway ability;
Embodiment 5
A kind of system of cooperative data transmission as shown in Figure 6, comprises, transceiver module 10, service module 20, cooperative module 30, collaborative user 40;
Cooperative module 30 receives the collaborative user's that described service module or described transceiver module issue downlink service data;
The collaborative user 40, and the channel quality information of feedback is uploaded to service module 20, receive the collaborative user's that described service module 20 or institute's cooperative module 30 issue downlink service data;
Described service module 20 also comprises judging unit 201, be used to judge whether to have the user of the collaborative transmission of needs, compare according to the channel quality information of user feedback and the collaborative thresholding of setting, when the channel quality information of feedback is less than or equal to collaborative thresholding, then described user is worked in coordination with transmission, described user becomes the user of described collaborative transmission;
Described service module 20 also comprises selected cell 202, be used for to candidate's cooperative module of selecting from adjacent base station, and to the collaborative request of this candidate's cooperative module transmission, after described candidate's cooperative module receives collaborative request, determine whether to feed back the affirmation information of collaborative request to selected cell 202 according to the own resource distribution condition, described selected cell 202 is determined the coordinated groups of described collaborative user's module according to the affirmation information of the collaborative request that receives;
Described service module 20 also comprises control unit 203, is used for sending collaborative request to all cooperative modules 30 of coordinated groups, and all cooperative modules 30 of described coordinated groups are confirmed the described control unit of back feedback; Based on service module, collaborative unit is auxilliary, by the concrete scheduling of described control unit decision, determines to give the downlink resource and the modulation coding mode of collaborative unit, simultaneously the collaborative unit of notice;
Described service module 20 also comprises business datum Transmit-Receive Unit 204, is used for described user collaborative group information is uploaded to transceiver module 10 by the S1 interface; The downlink service data that described transceiver module 10 is issued carries out downlink service data transmission to the collaborative user by X2 interface on identical running time-frequency resource.
As shown in Figure 6: the system of embodiment 1 is: receiver module 10, user a, b downlink service data are handed down to described user's service module 20, and, collaborative user's downlink service data is handed down to service module 20 in the coordinated groups according to the coordinated groups information of described service module 20 feedbacks;
Described service module 20 also comprises business datum Transmit-Receive Unit 204, and described business datum Transmit-Receive Unit 204 is uploaded described user collaborative group information to transceiver module 10, and described user collaborative group information is uploaded to transceiver module 10 by the S1 interface; Described business datum transmitting-receiving transmitting-receiving 204 is carried out downlink service data transmission to the collaborative user by X2 interface with the downlink service data that described transceiver module issues on identical running time-frequency resource.
Suppose, set up coordinated groups and work in coordination with transmission for collaborative user a jointly, determine to give collaborative user a time 1,2 scheduling, determine that simultaneously collaborative user a uses QPSK, 1/3 code rate the best on time 1,2, service module is downlink resource and modulation coding mode notice cooperative module, at the same time, the downlink data of service module 20 user a that transceiver module 10 is issued is also passed to cooperative module 30 by X2 interface.Thereby service module 20, cooperative module 30 are according to downlink resource and the modulation coding mode of giving collaborative user a, on corresponding time, the data retransmission of subframe n or new data are passed to collaborative user a by eating dishes without rice or wine, on identical running time-frequency resource, collaborative user a is carried out the downlink service data transmission, continue the downlink service data allocative decision among the current LTE, the Access Network side is increased extra process.
In the foregoing description, when service module was set up coordinated groups, coordinated groups member also had following situation to form, comprise service module and collaborative unit 302, perhaps, collaborative unit 301 and collaborative unit 302, perhaps at least one collaborative unit can be realized with above-mentioned method.
Embodiment 6
A kind of collaborative system for transmitting also is provided, as shown in Figure 7, comprises, receiver module 10, service module 20, cooperative module 30, collaborative user's module 40
The system of embodiment 2 is: transceiver module 10, user a, b downlink service data are handed down to described user's service module 20, and according to the coordinated groups information of described service module 20 feedbacks, collaborative user's downlink service data is handed down to all members in the coordinated groups, collaborative user's downlink service data is handed down to service module 20 and cooperative module 30 in the coordinated groups; Or, collaborative user's downlink service data is handed down at least one cooperative module 30 in the coordinated groups;
Described service module 20 also comprises selected cell, sets up described coordinated groups, and service module 20 is main, and cooperative module 301 and cooperative module 302 are auxilliary;
Described service module 20 also comprises control signaling unit 203, described control signaling unit 203 sends collaborative request to all cooperative modules 30 of coordinated groups, all cooperative modules of described coordinated groups are confirmed the described control unit 203 of back feedback, described cooperative groups is united and is carried out scheduling of resource, and by the concrete scheduling of described selected cell decision, determine to give collaborative user's downlink resource and modulation coding mode, and notice cooperative module 30;
Described service module 20 also comprises business datum Transmit-Receive Unit 204, is used for uploading described user collaborative group information to receiver module, and described user collaborative group information is uploaded to transceiver module 10 by the S1 interface; Described business datum transceiver module 204 carries out downlink service data transmission to the collaborative user by X2 interface with the downlink service data that described receiver module issues on identical running time-frequency resource.
Suppose, service module 20 is passed to receiver module to the coordinated groups information of user a by the S1 interface, thereby transceiver module is known service module, collaborative unit 301, collaborative unit 302 and is the coordinated groups information of user a, then receiving that this coordinated groups is no longer before the signaling of service-user a, transceiver module is handed down to each member in the user a coordinated groups to the downstream data traffic of user a, specifically can adopt the multicast mode to realize, can guarantee that each member of coordinated groups receives collaborative user's downlink data that receiver module issues simultaneously.
Thereby by service module 20 is main, cooperative module 301, cooperative module 302 is auxilliary, unite and carry out scheduling of resource, in the concrete scheduling process, service module 20 is according to collaborative unit 301, the resource allocation conditions that collaborative unit 302 reports, and the resource allocation conditions of combination oneself defines 5 time equal free time on these three modules, according to the channel frequency selectivity characteristic, in time 1,2, user a is best to the channel condition of service module on 3, in time 1,2, user a is to cooperative module 301 on 4, the channel condition of cooperative module 302 is best, service module is determined time 1, user a is given in 2 scheduling, determine that simultaneously user a is in time 1, use 16QAM on 2,1/2 code rate the best, thus service module is downlink resource and the collaborative unit 301 of modulation coding mode notice, collaborative unit 302.When corresponding, frequently on the resource data retransmission of subframe n or new data are passed to collaborative user a by eating dishes without rice or wine; Continue the downlink service data allocative decision among the current LTE, the Access Network side is increased extra process.
In the foregoing description, when service module was set up coordinated groups, coordinated groups member also had following situation to form, comprise service module and collaborative unit 302, perhaps, collaborative unit 301 and collaborative unit 302, perhaps at least one collaborative unit can be realized with above-mentioned method.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All any modifications of being done within the spirit and principles in the present invention, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (14)
1. the method for a cooperative data transmission, it is characterized in that, comprise: serving BS is according to the channel quality information of user feedback, judge whether to have the user who needs collaborative transmission, if have, then serving BS is set up coordinated groups, the information that Service Gateway is uploaded according to described serving BS, downlink service data is handed down to described coordinated groups member, and described coordinated groups member is handed down to described collaborative user with the downlink service data that obtains.
2. the method for cooperative data transmission according to claim 1, it is characterized in that, described judge whether to have need the user of collaborative transmission specifically to refer to: described serving BS is according to the channel quality information of user feedback and the collaborative thresholding comparison of setting, when the channel quality information of feedback is less than or equal to collaborative thresholding, then described user is worked in coordination with transmission, described user becomes the user of described collaborative transmission.
3. the method for cooperative data transmission according to claim 1, it is characterized in that, described serving BS is set up coordinated groups and specifically referred to: the candidate that described serving BS is selected from adjacent base station works in coordination with the base station, and to the collaborative request of this candidate collaborative base station transmission, after the collaborative base station of described candidate receives collaborative request, determine whether to feed back the affirmation information of collaborative request to described serving BS according to the own resource distribution condition, described serving BS is determined described collaborative user's coordinated groups according to the affirmation information that receives.
4. the method for cooperative data transmission according to claim 1 is characterized in that, described coordinated groups comprises described serving BS and at least one described collaborative base station.
5. the method for cooperative data transmission according to claim 4 is characterized in that, the information that described serving BS is uploaded comprises coordinated groups information and control signaling.
6. the method for cooperative data transmission according to claim 4 is characterized in that, the information that described serving BS is uploaded comprises the control signaling.
7. the method for cooperative data transmission according to claim 5, it is characterized in that, described Service Gateway issues collaborative user's downlink service data for described serving BS and described collaborative base station, and described collaborative user is handed down to described downlink service data in described serving BS and described collaborative base station.
8. the method for cooperative data transmission according to claim 5 is characterized in that, described Service Gateway issues described collaborative user's downlink service data for collaborative base station, and described collaborative user is handed down to described downlink service data in described collaborative base station.
9. the method for cooperative data transmission according to claim 6, it is characterized in that, described Service Gateway issues collaborative user's downlink service data for described serving BS, described serving BS is passed to collaborative base station with described downlink service data, and coordinated groups member is handed down to described collaborative user with described downlink service data.
10. the method for cooperative data transmission according to claim 3, it is characterized in that, after described serving BS is determined described coordinated groups, described coordinated groups is carried out the federated resource scheduling, described serving BS is main, and described collaborative base station is auxilliary, by the concrete scheduling of described serving BS decision, determine to give collaborative user's downlink resource and modulation coding mode, notify described collaborative base station simultaneously.
11. the method according to each described cooperative data transmission of claim 1 to 9 is characterized in that, described collaborative user is carried out the downlink service data transmission specifically refer to, the data retransmission of subframe n or new data are eated dishes without rice or wine to pass to described collaborative user by antenna.
12. the system of a cooperative data transmission is characterized in that, comprises transceiver module, service module, cooperative module, collaborative user;
Described service module, channel quality information according to user feedback, judge whether to have the user who needs collaborative transmission, if have, then service module is set up coordinated groups, with the information uploading transceiver module, described coordinated groups member will receive the downlink service data that described transceiver module issues and be handed down to described collaborative user;
Described transceiver module, the information according to described service module is uploaded is handed down to described coordinated groups member with downlink service data, and described coordinated groups member is handed down to described collaborative user with the downlink service data that obtains;
Described cooperative module receives collaborative user's downlink service data that described service module or described transceiver module issue;
Described collaborative user is uploaded to described service module with channel quality information, receives collaborative user's downlink service data that described service module or described cooperative module issue;
13. the system of cooperative data transmission according to claim 12, it is characterized in that described service module also comprises judging unit, be used to judge whether to have the user of the collaborative transmission of needs, compare according to the channel quality information of user feedback and the collaborative thresholding of setting, when the channel quality information of feedback is less than or equal to collaborative thresholding, then described user is worked in coordination with transmission, described user becomes the user of described collaborative transmission;
Described service module also comprises selected cell, be used for candidate's cooperative module of selecting from adjacent base station, and to the collaborative request of this candidate's cooperative module transmission, after described candidate's cooperative module receives collaborative request, determine whether to feed back the affirmation information of collaborative request to described selected cell according to the own resource distribution condition, described selected cell is determined described collaborative user's coordinated groups according to the collaborative confirmation that receives;
Described service module also comprises control unit, is used for sending collaborative request to all collaborative unit of coordinated groups the described control unit of feedback after the collaborative confirmation of all collaborative unit affirmations of described coordinated groups; Based on described service module, described cooperative module is auxilliary, by the concrete scheduling of described control unit decision, determines to give the downlink resource and the modulation coding mode of collaborative unit, notifies described collaborative unit simultaneously;
Described service module also comprises the business datum Transmit-Receive Unit, is used for described user collaborative group information is uploaded to transceiver module by the S1 interface; The downlink service data that described transceiver module is issued carries out downlink service data transmission to described collaborative user by X2 interface on identical running time-frequency resource.
14. the system according to claim 12 or 13 described cooperative data transmissions is characterized in that, described collaborative user is carried out the downlink service data transmission specifically refer to, the data retransmission of subframe n or new data are eated dishes without rice or wine to pass to described collaborative user by antenna.
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| CN2009101070725A CN101883402A (en) | 2009-05-07 | 2009-05-07 | Cooperative data transmission method and system |
| PCT/CN2010/072540 WO2010127638A1 (en) | 2009-05-07 | 2010-05-07 | Method, system and base station device for data coordinated transmission |
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| CN2009101070725A CN101883402A (en) | 2009-05-07 | 2009-05-07 | Cooperative data transmission method and system |
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