CN102195915B - Cooperative multi-point transmission method and equipment - Google Patents
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Abstract
The invention discloses a cooperative multi-point transmission method and equipment. The method comprises the following steps of: weighting a data signal by using a phase adjusting value, so that a mobile terminal can combine data signals received from a plurality of cooperative sites to form a combination signal with the maximum signal intensity; and transmitting the weighted data signal to the mobile terminal. By adopting the technical scheme, the mobile terminal can constantly obtain enhanced data streams.
Description
Technical field
Embodiments of the present invention are broadly directed to the communications field, more specifically, relate to a kind of cooperative multi-point transmission method and equipment thereof.
Background technology
Collaborative multiple spot (CoMP) transmission is a technology getting a good chance of in advanced Long Term Evolution (LTE-Advanced), can improve the covering of cell edge for effectively reducing presence of intercell interference (ICI), increases the throughput of system.Joint transmission (JT) is one of CoMP scheme, and in this scheme, data flow is shared in the collaborative collection of CoMP, carries out Combined Treatment, and send to a plurality of users by a plurality of communities.User merges after receiving signal, to improve signal power and to reduce presence of intercell interference.
Fig. 6 shows the example of such a multi-site joint transmission.In Fig. 6, by eNB1, eNB2 and eNB3, worked in coordination with as the UE1 in eNB1 provides service, eNB1, eNB2 and eNB3 are called to collaborative site.Use according to the selected transmission precoder of local channel state (CSI) from each collaborative site to UE1 and respectively the data flow from each collaborative site is weighted.Suppose that eNB1, eNB2 are respectively W11, W12, W13 with the eNB3 precoder corresponding with UE1, if the data flow sending from each collaborative site to UE1 is identical, the signal that UE1 receives can be expressed as:
Y＝(H
11W
11+H
12W
12+H
13W
13)X+NI
Wherein, X is the data flow the precoding sending from collaborative site to UE1, and NI is interference and the noise of introducing in process of transmitting.
In above-mentioned equation, from the signal of different collaborative site, there is different phase informations, therefore, the mixed channel H of equivalence
11w
11+ H
12w
12+ H
13w
13the data flow that always at any time can not be enhanced.
Summary of the invention
Embodiments of the present invention have proposed a kind of cooperative multi-point transmission method and equipment thereof, with the data flow being enhanced consistently.
According to an aspect of the present invention, a kind of cooperative multi-point transmission method is provided, comprise and use phase adjustment value to be weighted processing to data-signal, so that described mobile terminal can merge the data-signal receiving from a plurality of collaborative site, form the combined signal with maximum signal; The data-signal of processing through weighting is sent to mobile terminal.
According to a further aspect in the invention, a kind of cooperative multi-point transmission method is provided, comprise and receive and merge the data-signal from a plurality of collaborative site, wherein, described data-signal is used corresponding phase adjustment value to carry out weighting processing in each of described a plurality of collaborative site, so that the signal after merging has maximum signal strength signal intensity.
In accordance with a further aspect of the present invention, a kind of base station is provided, comprise phase weighting unit, be used for using phase adjustment value to be weighted processing to data-signal, so that described mobile terminal can merge the data-signal receiving from a plurality of base stations, form the combined signal with maximum signal; Base station transceiver unit, for sending to mobile terminal by the data-signal of processing through weighting.
According to another aspect of the invention, a kind of mobile terminal is provided, comprise: terminal Transmit-Receive Unit, be used for receiving and merging the data-signal from a plurality of collaborative site, wherein, described data-signal is used corresponding phase adjustment value to carry out weighting processing in each of described a plurality of collaborative site, so that the signal after merging has maximum signal strength signal intensity.
According to another aspect of the invention, provide a kind of cooperative multipoint transmission system, comprised a plurality of above-mentioned base stations and mobile terminal, and the backhaul for communicating by letter between described base station.
According to the disclosed technical scheme of embodiments of the invention, the data-signal that collaborative site is transmitted is arrived after mobile terminal, through mobile terminal, merge the signal obtaining and can reach maximum signal strength signal intensity, thereby obtained consistently the data flow strengthening.
Accompanying drawing explanation
By reference to the accompanying drawings embodiments of the invention are described in detail, can understand better the present invention, wherein:
Fig. 1 shows the applied exemplary cell of the embodiment of the present invention and disposes and clustering architecture;
Fig. 2 shows the transmission system of the embodiment of the present invention;
Fig. 3 shows the architecture of base station block diagram of the embodiment of the present invention;
Fig. 4 shows the structured flowchart of the mobile terminal of the embodiment of the present invention;
Fig. 5 shows the method flow diagram of the embodiment of the present invention;
Fig. 6 shows the transmission system of prior art scheme.
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.
Fig. 1 shows the applied a kind of cell deployment of the embodiment of the present invention and clustering architecture.In the structure shown in Fig. 1, always have 7 websites (as shown in the round dot in Fig. 1), each website has the community of 3 rhombuses.Three neighbor cells from different websites form bunch (as shown in the shadow region in Fig. 1).Joint transmission and combined dispatching carry out in each bunch.It should be appreciated by those skilled in the art that structure illustrated in fig. 1 is only for conveniently clearly setting forth the technical scheme that the embodiment of the present invention proposes rather than the restriction to application scenarios of the present invention.From next, to can clearly be seen that the detailed description of embodiment of the present invention, the method and apparatus that embodiment of the present invention proposes is applicable to any cell deployment and clustering architecture that relates to a plurality of websites.
Embodiments of the invention have proposed a kind of transmission system, and as shown in Figure 2, this transmission system comprises a plurality of base stations, mobile terminal and the backhaul that will describe below.Be to be appreciated that, although only schematically show three base station eNB 1, eNB2 and eNB3 and a mobile terminal UE 1 in Fig. 2, yet in actual network design, can have more or less base station and more mobile terminal, the communication between each base station also can be undertaken by alternate manner.
Embodiments of the invention have proposed a kind of base station.As shown in Figure 3, this base station comprises phase weighting unit 320, for data-signal is carried out to phase weighting; Base station transceiver unit 330, for the data-signal after phase weighting being treated to the signal that is applicable to spacing wireless transmission, without limitation, the function of base station transceiver unit 330 can comprise digital to analog conversion, up-conversion, power amplification etc.
This base station also can comprise optimum precoder 310, for data-signal being carried out to optimum precoding before data-signal is carried out to phase weighting, and the processing such as can pass through in advance coding, modulate and interweave of the data-signal of inputting optimum precoder.
Base station transceiver unit 330 also sends downlink reference signal the feedback of mobile terminal receive to downlink reference signal to mobile terminal, without limitation, can send by the mode of broadcast.This base station also can comprise information extraction unit 340, for the feedback receiving from base station transceiver unit 330, extracts optimum phase adjusted value information.Phase weighting unit 320, for being configured according to this optimum phase adjusted value information, makes it with optimum phase adjusted value, to the signal of follow-up transmission, be weighted.The optimum phase adjusted value information here can be optimum phase adjusted value itself, can be also can unique expression optimum phase adjusted value any numerical value.
In addition, in the feedback from mobile terminal, can also comprise the optimum precoding information for this base station.
Embodiments of the invention have also proposed a kind of mobile terminal.As shown in Figure 4, this mobile terminal comprises terminal Transmit-Receive Unit 410, for the downlink reference signal that each collaborative base station is sent, carries out radio frequency processing.Without limitation, the function of terminal Transmit-Receive Unit 410 can comprise low noise amplification (LNA), down-conversion, analog to digital conversion etc.Phase calculation unit 420, for feeding back to corresponding collaborative base station according to the calculated signals optimum phase adjusted value after processing and by terminal Transmit-Receive Unit 410, here, optimum phase adjusted value is the data flow phase adjustment value that makes each collaborative base station of the wireless signal strength maximum that receives.
Mobile terminal also comprises precoding determining unit 440, the optimum pre-coding matrix for the calculated signals after processing according to terminal Transmit-Receive Unit 410 for each base station, and feed back to corresponding base station by terminal Transmit-Receive Unit 410.
Terminal Transmit-Receive Unit 410 also carries out radio frequency processing for the data-signal that each collaborative base station is sent, and wherein, this data-signal has passed through phase weighting on each collaborative base station.This mobile terminal also comprises demodulating unit 430, for to coming the data of self terminal Transmit-Receive Unit 410 to carry out signal baseband operation, as demodulation, deinterleaving, decoding etc.
Although above with the formal description of separated functional module base station and the mobile terminal of the embodiment of the present invention, but each assembly shown in Fig. 3 or Fig. 4 can be realized with a plurality of devices in actual applications, and a plurality of assemblies that illustrate also can be integrated in chip piece or an equipment in actual applications.This base station and mobile terminal also can comprise any unit and the device for other object.
Below in conjunction with Fig. 5, the function of the equipment shown in Fig. 3 and Fig. 4 is described in detail.
In down link (DL) multi-site cooperative transmission schemes, one or more presence of intercell interference becomes the useful signal for increasing signal power.For example, in Fig. 6, by three adjacent eNB, to UE1, provide service.UE1 can be according to measuring DL channel condition information (CSI) from the DL reference signal of three eNB respectively, thereby and determine and optimum precoder that corresponding CSI matches, the same with the example for Fig. 6, the optimum precoder of collaborative eNB can be expressed as to W11, W12 and W13.Different channels from different e NB has different phase directionals, selects suitable phase directional adjustment in an embodiment of the present invention can strengthen the intensity of the signal after merging for each collaborative site.
Using the direction of data flow of serving BS eNB1 as benchmark, and the angle of supposing two data flow execution of phase correction of eNB2 is θ
1and θ
2, and suppose that the angle of two data flow execution of phase correction of eNB2 is θ
3and θ
4.
As shown in Figure 5, in step 510,310 pairs of data-signals of optimum precoder in collaborative eNB carry out precoding, in step 520, data-signal after 320 pairs of phase weighting unit coding is introduced different phasing matrixes, and the data-signal and the downlink reference signal that via base station transceiver unit 330, send after phase weighting.In step 530,410 pairs of data-signals of the terminal Transmit-Receive Unit of UE1 and downlink reference signal receive and detect, and wherein, the data-signal receiving can be expressed as:
Wherein, the phasing matrix of eNB2 is
The phasing matrix of eNB3 is
In order to select optimum phase adjustment value, in step 540, according to formula (2), the capacity that phase calculation unit 420 is combined signal according to the downlink reference signal receiving solves maximum, thereby obtains optimum phase adjusted value:
Wherein, the amplitude of acquiescence downlink reference signal is 1.Wherein, H
11(k) represent H
11channel value on k frame or k carrier wave, its value can obtain in actual measurement.K is time domain or frequency domain width, and the span of k can be several frames in time domain, can be also tens subcarriers on frequency domain, and preferably, the span of k should not be too large.
When equation (2) is obtained maximum, can think and obtain each optimum phase adjusted value.Preferably, resulting optimum phase adjusted value when solution formula (2), can from one group of following phase angle, select:
Wherein, N is the granularity of phasing.
If N is set to 2, optional phase angle has two ,+1, and-1}, each phasing needs the feedback of 1 bit.
If N is set to 4, optional phase angle has four,
each phasing needs the feedback of 2 bits.
If N is set to 2
m, each phasing needs the feedback of m bit.
In user's side, there are two kinds of feedbacks to determine and send weighted information (pre-coding matrix index and/or optimum phase adjusted value):
One, determine optimum precoder with coupling the local DL channel condition information (CSI) from collaborative eNB, and corresponding pre-coding matrix index (PMI) is fed back to its service eNB, then by service eNB, by backhaul, PMI is sent to other collaborative eNB.Each collaborative eNB is used pre-coding matrix separately, in step 510, data-signal is carried out to precoding.Wherein, optimum precoder is to solve and obtain respectively according to the channel of each community, and its concrete method for solving is known to those skilled in the art, does not repeat them here.
Its two, if use phasing algorithm further to strengthen the signal strength signal intensity receiving, only need a small amount of added bit to carry out the adjustment of feedback phase direction.
The base station transceiver unit 330 of corresponding eNB receives after feedback information, in step 550, information extraction unit 340 extracts optimum phase adjusted value information and/or pre-coding matrix index, thereby, optimum precoder unit 310 is used pre-coding matrix index to carry out precoding to data-signal, and phase weighting unit 320 utilizes optimum phase adjusted value information to be weighted the data-signal through precoding.Data-signal after this weighting carries out base band signal process by demodulating unit 430, as demodulation, deinterleaving and decoding etc. after processing via corresponding eNB and UE1 Transmit-Receive Unit 330,410 separately in step 560.
What should be noted that is, the transmission of downlink reference signal and the transmission of data-signal do not have inevitable contacting, although therefore above with reference to the description indefiniteness of figure 4 by the generation of the transmission of data-signal and weighted information (pre-coding matrix index and/or optimum phase adjusted value) be delivered in a flow process and narrate, yet those skilled in the art will be appreciated that, these two processing can be independently, the generation and the transmission that are weighted information can be before data-signal transmission, among or any stage afterwards carry out, also can when there is no data-signal transmission, realize generation and the transmission of weighted information.
With system-level emulation, assess multi-site joint transmission that the embodiment of the present invention proposes in conjunction with the systematic function of phasing below.
System consumption and policy parameter are as follows:
Rhombus sector
Transmitter: 4 * 2CL-MIMO
Receiver: MMSE detector
Do not adopt HARQ
11 MCS types, target BLER=0.01
Equitable proportion (PF) scheduler
Channel estimation errors=3dB
Cell Edge User threshold value :-1dB
Multi-site joint transmission scheme based on Single User MIMO (SU-MIMO)
The phasing of 1 bit feedback
Two flow transmission
PMI based on code book selects
The system-level simulation result of table 1
| Transmission plan | Community average throughput (kbps) | 5% user throughput (kbps) |
| SU-MIMO | 9439(1.00) | 177.4(1.00) |
| Multi-site joint transmission | 9477(1.00) | 224.1(1.26) |
| Multi-site joint transmission (with phasing) | 9413(1.00) | 244.5(1.38) |
Table 1 shows simulation result, can find out that Yu Dan community SU-MIMO compares, and multi-site transmission plan obtains the cell edge throughput gain of 26% (=(224.1-177.4)/177.4), and does not lose average throughput.When additional use phasing algorithm, multi-site joint transmission scheme can also obtain the edge cell user throughput gain of 12% (=(244.5-177.4)/177.4-26%) more and lose hardly community average throughput.Further emulation also shows, when granularity (N) increase of phasing, can also further improve the systematic function of multi-site joint transmission.
Those skilled in the art should be easy to recognize, can realize by programmed computer the different step of said method.At this, some execution modes comprise equally machine readable or computer-readable program storage device (as, digital data storage medium) and coding machine can carry out or the executable program command of computer, wherein, some or all steps of said method are carried out in this instruction.For example, program storage device can be digital storage, magnetic storage medium (as Disk and tape), hardware or the readable digital data storage medium of light.Execution mode comprises the programmed computer of the described step of carrying out said method equally.
Description and accompanying drawing only illustrate principle of the present invention.Therefore should be appreciated that those skilled in the art can advise different structures, although these different structures clearly do not describe herein or illustrate, within having embodied principle of the present invention and being included in its spirit and scope.In addition, all examples of herein mentioning are the main only design with help reader understanding's principle of the present invention and promotion this area that inventor was contributed for teaching purpose clearly, and should be interpreted as not being the restriction to these specific examples of mentioning and condition.In addition, all statement and specific examples thereof of mentioning principle of the present invention, aspect and execution mode comprise its equivalent interior herein.
Description is above only for realizing embodiments of the present invention; it should be appreciated by those skilled in the art; the any modification or partial replacement not departing from the scope of the present invention; all should belong to the scope that claim of the present invention limits; therefore, protection scope of the present invention should be as the criterion with the protection range of claims.
Claims (11)
1. a cooperative multi-point transmission method, comprising:
Use is weighted processing by the determined phase adjustment value of mobile terminal to data-signal, so that described mobile terminal can merge the data-signal receiving from a plurality of collaborative site, forms the combined signal with maximum signal;
The data-signal of processing through weighting is sent to described mobile terminal;
Wherein, by added bit, carry out the adjustment of feedback phase direction, if wherein the granularity N of phasing is set to 2
m, each phasing needs the feedback of m bit.
2. method according to claim 1, also comprises:
Before the described phase adjustment value of use is weighted data-signal, described data-signal is carried out to optimum precoding.
3. method according to claim 1 and 2, also comprises:
To described mobile terminal, send downlink reference signal;
Receive the feedback of described mobile terminal to described downlink reference signal, and from described feedback, extract described phase adjustment value and/or for carrying out the pre-coding matrix index of optimum precoding.
4. a cooperative multi-point transmission method, comprising:
Receive and merge the data-signal from a plurality of collaborative site, wherein, described data-signal is used and corresponding by the determined phase adjustment value of mobile terminal, has carried out weighting processing in each of described a plurality of collaborative site, so that the signal after merging has maximum signal strength signal intensity; Wherein, described mobile terminal carrys out the adjustment of feedback phase direction by added bit, if wherein the granularity N of phasing is set to 2
m, each phasing needs the feedback of m bit.
5. method according to claim 4, also comprises:
Receive the downlink reference signal that described a plurality of collaborative site sends;
According to described downlink reference signal, determine for each phase adjustment value and/or the pre-coding matrix index for carrying out optimum precoding in described a plurality of collaborative site in described a plurality of collaborative site;
Described phase adjustment value and/or described precoding matrix index feedback are arrived to described a plurality of collaborative site.
6. a base station, comprising:
Phase weighting unit, for using, by the determined phase adjustment value of mobile terminal, data-signal is weighted to processing, so that described mobile terminal can merge the data-signal receiving from a plurality of collaborative site, form the combined signal with maximum signal;
Base station transceiver unit, for sending to described mobile terminal by the data-signal of processing through weighting;
Wherein, described mobile terminal carrys out the adjustment of feedback phase direction by added bit, if wherein the granularity N of phasing is set to 2
m, each phasing needs the feedback of m bit.
7. base station according to claim 6, also comprises:
Optimum precoding unit, before data-signal being weighted at the described phase adjustment value of use, carries out optimum precoding to described data-signal.
8. according to the base station described in claim 6 or 7, wherein, described base station transceiver unit is also for sending downlink reference signal to described mobile terminal;
Described base station also comprises:
Information extraction unit for receiving the feedback of described mobile terminal to described downlink reference signal, and is extracted described phase adjustment value and/or for carrying out the pre-coding matrix index of optimum precoding from described feedback.
9. a mobile terminal, comprising:
Terminal Transmit-Receive Unit, be used for receiving and merging the data-signal from a plurality of collaborative site, wherein, described data-signal is used and corresponding by the determined phase adjustment value of described mobile terminal, has carried out weighting processing in each of described a plurality of collaborative site, so that the signal after merging has maximum signal strength signal intensity;
Wherein, described mobile terminal carrys out the adjustment of feedback phase direction by added bit, if wherein the granularity N of phasing is set to 2
m, each phasing needs the feedback of m bit.
10. mobile terminal according to claim 9, wherein, the downlink reference signal that described terminal Transmit-Receive Unit also sends for receiving described a plurality of collaborative site;
Described mobile terminal also comprises:
Phase place determining unit, for according to described downlink reference signal, determines for each phase adjustment value in described a plurality of collaborative site; And/or
Precoding determining unit, for according to described downlink reference signal, is identified for the pre-coding matrix index that carries out optimum precoding in described a plurality of collaborative site.
11. 1 kinds of cooperative multipoint transmission systems, comprise according to the base station described in any one in claim 6 to 8, according to the mobile terminal described in claim 9 or 10 and the backhaul for communicating by letter between described base station.
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| EP2635087A1 (en) * | 2012-02-28 | 2013-09-04 | Alcatel Lucent | Apparatus, method and computer program for controlling transmission points in a mobile communication system |
| CN103596196B (en) * | 2012-08-14 | 2018-05-25 | 中兴通讯股份有限公司 | A kind of multi-access point calibration method and device |
| US9888469B2 (en) * | 2014-03-19 | 2018-02-06 | Nec Corporation | Signalling for coordinated multi-point transmission and reception (CoMP) |
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| CATT.Aspects of Joint Processing for Downlink CoMP.《3GPP TSG RAN WG1 meeting #56》.2009,第3节，第3.2节，图2. |
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Address after: 201206 Pudong New Area, Nanjing Road, No. 388, Shanghai Patentee after: Shanghai NOKIA Baer Limited by Share Ltd Address before: 201206 Pudong New Area, Nanjing Road, No. 388, Shanghai Patentee before: Shanghai Alcatel-Lucent Co., Ltd. |