CN101874367B - Signal forwarding method and apparatus serving in relay station of a plurality of network apparatuses - Google Patents
Signal forwarding method and apparatus serving in relay station of a plurality of network apparatuses Download PDFInfo
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- 238000004891 communication Methods 0.000 claims abstract description 31
- 230000005540 biological transmission Effects 0.000 claims description 65
- 238000012545 processing Methods 0.000 claims description 30
- 238000001514 detection method Methods 0.000 claims description 12
- 238000007476 Maximum Likelihood Methods 0.000 claims description 7
- 238000007493 shaping process Methods 0.000 claims description 5
- 239000011159 matrix material Substances 0.000 description 29
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2603—Arrangements for wireless physical layer control
- H04B7/2606—Arrangements for base station coverage control, e.g. by using relays in tunnels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
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Abstract
A signal forwarding method in a relay station in a wireless communication network comprises the following steps: a) judging whether the time-frequency resources which are occupied in the communication between a plurality of network devices and the present relay station, are totally or partially same; b) according to the preset rules and the channel related information of a plurality of channels between the plurality of network devices and the present relay station, carrying on the process on the communication signals between the plurality of network devices and the present relay station. The present invention could reduce the same-frequency interference between multi-cells, promote the system capability, and enlarge the cell coverage. When using a plurality of relay stations, the present invention could improve the signal quality.
Description
Technical field
The present invention relates to the radio communication junction network, relate in particular in the relay station of serving a plurality of network equipments in the radio communication junction network simultaneously for signal forwarding method and device.
Background technology
When mobile radio station is positioned at when having serious presence of intercell interference regional, during as cell edge region, co-channel interference (perhaps common-channel interference) from neighbor cell has seriously reduced the communication quality of mobile radio station and base station, and has further limited coverage and the throughput of whole system.
The method of more traditional inhibition presence of intercell interference comprises fractional frequency reuse (FFR, Fractional Frequency Reuse) or the grand diversity technology such as (MD, Macro Diversity) of adopting in the prior art.Be example with the OFDM/OFDMA system, the subcarrier reuse scheme of its fractional frequency reuse as shown in Figure 1, the mobile radio station that is positioned at the center of housing estate zone can use whole frequency resources, the mobile radio station that is arranged in cell edge region only can use the part of available frequencies resource collection, as shown in fig. 1, suppose that F1+F2+F3 is the available frequencies resource collection, F1, F2, F3 is mutual nonoverlapping frequency resource set, the mobile radio station that is positioned at each center of housing estate zone can use whole frequency resources, the mobile radio station that is arranged in the 1st residential quarter C1 fringe region only uses the frequency resource of F1 set, the mobile radio station that is arranged in the 2nd residential quarter C2 fringe region only uses the frequency resource of F2 set, and the mobile radio station that is arranged in the 3rd residential quarter C3 fringe region only uses the frequency resource of F3 set.Like this, by for the mobile radio station that is positioned at the neighbor cell fringe region distributes different frequency resources, thereby reduced the co-channel interference from neighbor cell that Cell Edge User receives effectively.Yet, can only use the part of available frequencies resource owing to be arranged in the mobile radio station of cell edge region, thereby limit the capacity of cell edge region.
The scheme of grand diversity is as follows: in cell edge region, a mobile radio station is served at identical running time-frequency resource in a plurality of base stations, this method also can reduce the co-channel interference of minizone effectively, but owing to need to work in coordination with between a plurality of base stations, and because a mobile radio station rather than a plurality of mobile radio station can only be served in a plurality of base stations on identical running time-frequency resource, thereby limited the capacity of whole system.
Summary of the invention
At the above-mentioned shortcoming of the scheme of inhibition presence of intercell interference of the prior art, the present invention proposes a kind of scheme of new inhibition presence of intercell interference.Place one or more relay stations in the more serious zone of co-channel interference (as cell edge region), receive from the signal of different source network device (base station, relay station or mobile radio station) or send different signals to different destination network devices (mobile radio station, relay station or base station) at identical running time-frequency resource by these one or more relay stations.
According to a first aspect of the invention, a kind of signal forwarding method that is used in the relay station of cordless communication network is provided, wherein, this relay station comprises that many receive and transmitting antenna, it is characterized in that this method may further comprise the steps: a. judges whether take partly or entirely identical running time-frequency resource when a plurality of network equipments are communicated by letter with this relay station; If b. described a plurality of network equipment and this relay station are communicated by letter and taken partly or entirely identical running time-frequency resource, this relay station is handled the signal of communication between described a plurality of network equipments and this relay station based on pre-defined rule and according to the channel related information of a plurality of channels of described a plurality of network equipments and this relay station on described partly or entirely identical running time-frequency resource so.
According to a second aspect of the invention, a kind of retransmission unit that signal is transmitted that is used in the relay station of cordless communication network is provided, and wherein, this relay station comprises that many receive and transmitting antenna, it is characterized in that this retransmission unit comprises judgment means and processing unit.Wherein, judgment means judges whether take partly or entirely identical running time-frequency resource when a plurality of network equipments are communicated by letter with this relay station; If described a plurality of network equipment takies partly or entirely identical running time-frequency resource when communicating by letter with this relay station, processing unit is handled the signal of communication between described a plurality of network equipments and this relay station based on pre-defined rule on described partly or entirely identical running time-frequency resource.
Can communicate by letter with a plurality of network equipments on identical running time-frequency resource owing to relay station among the present invention, not only can reduce the co-channel interference of many minizones effectively, and improved number of users that system supports to improve power system capacity, also have the advantage that enlarges cell coverage area simultaneously.Because each base station distributes running time-frequency resource to give its institute's relay station of having jurisdiction over and mobile radio station independently, does not need working in coordination with between the base station.The solution of the present invention also is transparent to mobile radio station.If adopt a plurality of relay stations, can further improve the signal quality of the signal that receives or send.In addition, the present invention is not only applicable to a plurality of base stations and has jurisdiction over one or more relay stations altogether to alleviate the situation of presence of intercell interference; Also be applicable to the situation of being administered one or more relay stations by a base station, these one or more relay stations are served a plurality of user terminals at identical running time-frequency resource, to increase power system capacity when enlarging system ovelay range.
Description of drawings
Read following detailed description to non-limiting example by the reference accompanying drawing, other features, objects and advantages of the present invention will become more obvious.In the accompanying drawings, identical with similar Reference numeral represents same or analogous device or method step.
Fig. 1 is the schematic diagram of the partial frequency multiplexing in the cordless communication network in the prior art;
Fig. 2 is a kind of network topology structure schematic diagram according to the cordless communication network of a specific embodiment of the present invention;
Fig. 3 is the another kind of network topology structure schematic diagram according to the cordless communication network of a specific embodiment of the present invention;
Fig. 4 is another the network topology structure schematic diagram according to the cordless communication network of a specific embodiment of the present invention;
Fig. 5 is another the network topology structure schematic diagram according to the cordless communication network of a specific embodiment of the present invention;
Fig. 6 is used for the signal forwarding method flow chart according to a specific embodiment of the present invention in the relay station of cordless communication network;
Fig. 7 is the structured flowchart according to the retransmission unit that is used for the signal forwarding in the relay station of cordless communication network of a specific embodiment of the present invention.
Embodiment
Fig. 2 shows a kind of network topology structure figure according to a specific embodiment of the present invention.Comprise base station B2 among Fig. 2, the mobile radio station M3 that is had jurisdiction over by base station B2; Base station B2 ', the mobile radio station M3 ' that is had jurisdiction over by base station B2 '; Relay station R1 is positioned at the edge of the residential quarter of being had jurisdiction over by base station B2 and base station B2 ', and base station B2 and base station B2 ' have jurisdiction over relay station R1 altogether.
With the descending example that is transmitted as, a specific embodiment of the present invention is described in detail below.
Base station B2 and base station B2 ' distribute running time-frequency resource to give its each mobile radio station of having jurisdiction over and relay station (not shown other mobile radio station and relay station among Fig. 2 for simplicity's sake) independently.
Relay station R1 is according to from the running time-frequency resource of base station B2 mapping signaling, and for example the downlink map information that is arranged in the physical frame front portion (DL-MAP) among the WiMAX comprises the running time-frequency resource map information and learns which running time-frequency resource it will receive at and send to the signal of mobile radio station M3 and on which running time-frequency resource this signal is transmitted to mobile radio station M3 from base station B2.Equally, relay station R1 is according to the running time-frequency resource mapping signaling from base station B2 ', and the downlink map information (DL-MAP) that for example is arranged in the physical frame front portion among the WiMAX comprises the running time-frequency resource map information and learns that it will send to which running time-frequency resource reception the signal of mobile radio station M3 ' and on which running time-frequency resource this signal is transmitted to mobile radio station M3 ' from base station B2 ' in.
Relay station R1 receives from the process of the different signal of base station B2 and base station B2 ' as follows:
Suppose that base station B2 transmits employed running time-frequency resource with base station B2 ' to the signal between the relay station R1 to the transmission of the signal between the relay station R1 some identical running time-frequency resources are arranged, some different running time-frequency resources are arranged again.
On those different running time-frequency resources, relay station R1 directly detects the signal that obtains from base station B2 and base station B2 ' at separately running time-frequency resource.This processing with existing relay station of serving a base station is similar, and the present invention no longer describes in detail.
On those identical running time-frequency resources, relay station R1 then adopts multiple-input and multiple-output (MIMO, Multiple-Input Multiple-Output) the detection interpretation method of technology is to separating with the mixed signal of base station B2 ' from base station B2 of receiving, to obtain the signal from base station B2 and base station B2 ' respectively.The detection interpretation method of MIMO has multiple, ZF method (ZF, Zero Forcing) detection with linearity comes relay station R1 is described in detail the process (soon separating from the signal of base station B2 and base station B2 ') that the mixed signal that receives detects decoding for example below.There are 2 reception antennas at the suppose relay station, and base station B2 and base station B2 ' respectively have 1 transmit antennas, establish
Be respectively base station B2, base station B2 ' to the channel transmission matrix between the relay station R1, wherein, h
11, h
21Be respectively the antenna BA1 of base station B2 to the channel transmission coefficient between relay station two antenna RA1, the RA2 then; h
12, h
22Be respectively the antenna BA1 ' of base station B2 ' to the channel transmission coefficient between two antenna RA1, the RA2 of relay station R1; Whole channel transmission matrix from base station B2 and base station B2 ' to relay station R1 is expressed as
The signal y that receives among the relay station R1 can be write as following expression formula:
Wherein y1 and y2 are respectively the signal that two antenna RA1 on the relay station R1 and RA2 receive;
Wherein, s
1For base station B2 issues the signal of mobile radio station M3, s
2Issue the signal of mobile radio station M3 ' for base station B2 ';
Be noise item.
With
Multiply by formula (1) and can get following expression:
Because n is noise item, generally estimates in advance; H
BRFor channel transmission coefficient matrix, can estimate in advance by channel estimating;
The result be unit matrix I; Therefore, can obtain sending signal s according to formula (2)
1And s
2Estimated value, namely solve s
1And s
2
It is as follows to the process of mobile radio station M3 and mobile radio station M3 ' that relay station R1 sends different signals:
The signal that the running time-frequency resource that relay station R1 distributes for the mobile radio station of service separately according to base station B2 and base station B2 ' will detect after deciphering sends to mobile radio station M3 and mobile radio station M3 ' respectively.Employed running time-frequency resource both may have some identical running time-frequency resources, and some different running time-frequency resources may be arranged again.
For used different running time-frequency resources to send a signal to the situation of mobile radio station M3 and mobile radio station M3 ' respectively by relay station R1, relay station R1 sends to mobile radio station M3 and mobile radio station M3 ' with signal respectively on the different running time-frequency resource of base station B2 and base station B2 ' distribution.This is similar with prior art, and the present invention no longer describes in detail.
Use on the identical running time-frequency resource to the signal transmission of mobile radio station M3 ' with relay station R1 to the signal transmission of mobile radio station M3 at those relay stations R1, relay station R1 need utilize multi-user's space division multiple access (SDMA) precoding technique to sent signal s
1And s
2Carry out precoding reducing even to eliminate interference between a plurality of users, this moment relay station R1 with mobile radio station M3 and mobile radio station M3 ' between a formation multiuser MIMO (MU-MIMO, Multi-User MIMO) system.Multi-user MIMO pre-encoding is a kind of realization technology of multi-user SDMA.
The method of multi-user SDMA precoding has multiple, inverse channel ZF method (Channel Inversion) precoding (inverse channel ZF method is a kind of of ZF method SDMA precoding) with linearity is example below, and the process that the signal that relay station R1 is sent to mobile radio station M3 and mobile radio station M3 ' at identical running time-frequency resource carries out precoding is elaborated.Still having two transmitting antennas, mobile radio station M3 and mobile radio station M3 ' with relay station R1, respectively to have a reception antenna be example.If H
RM1=[m
11m
12], H
RM2=[m
21m
22] be respectively relay station R1 to the channel transmission matrix of mobile radio station M3 and mobile radio station M3 ', wherein, m
11, m
12Be respectively two antenna RA1 of relay station R1 and RA2 to the channel transmission coefficient of the reception antenna MA1 of mobile radio station M3; m
21, m
22Be respectively two antenna RA1 of relay station R1 and RA2 to the channel transmission coefficient of the reception antenna MA1 ' of mobile radio station M3 '.From relay station R1 to mobile radio station M3 and the whole channel transmission matrix of mobile radio station M3 ' be expressed as:
If
x
1, x
2Being the signal of the transmission on relay station R1 antenna RA1, the RA2, is to sending to the signal s to be sent of mobile radio station M3 and mobile radio station M3 '
1, s
2Carry out the signal that forms after the precoding, then utilize the precoding of inverse channel method, the expression formula of x is as follows:
Wherein, a is the power normalization factor,
Be pre-coding matrix, at this moment, the signal that mobile radio station M3 receives is:
In like manner, the signal that receives of mobile radio station M3 ' is:
Wherein, n
3And n
4Be noise item, can pre-determine its estimated value.As described above, relay station R1 passes through to utilize the relay station R1 of acquisition in advance to the channel transmission matrix H of mobile radio station M3 and mobile radio station M3 '
RMCalculate pre-coding matrix W and carry out precoding to sent signal, then can be so that receiving terminal, namely mobile radio station M3 and mobile radio station M3 ' can receive the signal that sends to them respectively, thereby have avoided the interference between each user.
It may be noted that relay station R1 to mobile radio station M3 and mobile radio station M3 ' transmission signal the time, need use the signal through the signal after the multi-user SDMA precoding and the different running time-frequency resources of use of identical running time-frequency resource form the physical frame transmission together.
More than detect decoding and inverse channel ZF method with the MIMO of ZF method the SDMA precoding be that example is transmitted downstream signal and is described in detail.Those of ordinary skill in the art will be understood that uplink signal transmissions similarly.The present invention describes in detail here no longer one by one.In addition, method of the present invention also is not limited to ZF method MIMO and detects decoding and the precoding of channel reverse ZF method, receive space division multiplexing (SM from different source network devices for relay station R1 at identical running time-frequency resource, Spatial Multiplexing) after the mixed signal, this mixed signal is carried out MIMO detection interpretation method to be had multiple, mainly be divided into linear and non-linear two class methods, the linearity test interpretation method comprises that above-mentioned ZF method (sees list of references 1:Wolniansky P.W. for details, Foschini G.J., Golden G.D., et al.V-BLAST:an architecture for realizing very high data rates over the rich-scattering wireless channel.In ISSSE, Pisa, Italy, 1998.295-300; List of references 2:B.A.Bjecke, J.G.Proakis.Multiple transmit and receive antenna diversity techniques for wireless communications.Proceedings of IEEE Adaptive Systems Signal Processing, Communications, Control Symp., Lake Louise, AB, Canada, October, 2000.70-75), least mean-square error method (MMSE, Minimum Mean Squared Error sees list of references 2 for details) etc., and their various distortion, simplification; The non-linear detection interpretation method is included in ZF, further adopt various interference to eliminate (IC on the basis of least mean-square error method, Interference Cancellation, see list of references 1 for details) technology, and maximum likelihood method (ML, Maximum Likelihood, see list of references 3:G.Awater for details, A.van Zelst, R.van Nee.Reduced complexity space division multiplexing receivers.Proceedings of IEEE Vehicular Technology Conf., vol.1, Tokyo, Japan, May, 2000.11-15) and various simplification distortion etc., as the Maximum Likelihood Detection method (QRM-ML based on QR decomposition and M algorithm, QR decomposition and M-algorithm based ML, see list of references 4:H.Kawai for details, K.Higuchi, N.Maeda, et al.Likelihood function for QRM-MLD suitable for soft-decision Turbo decoding and its performance for OFCDM MIMO multiplexing in multipath fading channel.IEICE Trans.Commun., E88-B (1), 2005.47-56).Need on identical running time-frequency resource, send in the situation of unlike signal to a plurality of different target network equipments for relay station R1, the method of signal being carried out the SDMA precoding has multiple, mainly be divided into linear and non-linear two class methods, linear pre-coding method comprises that aforesaid inverse channel ZF method (sees list of references 5:Spencer Q.H. for details, Peel C.B., Swindlehurst A.L., et al.An Introduction to the multi-user MIMO downlink.IEEE Communications Magazine, October 2004.60-67), least mean-square error method (seeing list of references 5 for details), block diagonalization ZF method (BD, Block Diagonalization, see list of references 6:Spencer Q.H. for details, Swindlehurst A.L., Haardt M.Zero-forcing methods for downlink spatial multiplexingin multiuser MIMO channels.IEEE Transactions on Signal Processing, vol.52, No.2, February, 2004.461-471), beam shaping method (BF, Beamforming, see list of references 7:Liberti J.C. for details, smart antenna in the Rappaport T.S. radio communication---IS95 and the 3rd generation CDMA use. China Machine Press, 2002.) or (see list of references 8:Philips.Comparison between MU-MIMO codebook-based channel reporting techniques for LTE downlink.R1-062483 for details based on the predetermined codes calligraphy, October 2006.3GPP TGS RAN WG1 Meeting #46bis, Seoul) etc., and their various distortion, simplify, as multi-user features mode transfer (MET, Multi-user Eigenmode Transmission, see list of references 9:Lucent Technologies.Downlink enhancements using additional antennas for details, full channel knowledge, and multiuser eigenmode transmission.R1-061877, June, 2006.TSG-RAN WG1 LTE, Cannes, France), (TR-MMSE sees list of references 10:M.T. for details to the least mean-square error of transmitting-receiving iteration
R.L.Choi, R.D.Murch, J.A.Nossek.Effective user of long-term transmit channel state information in multi-user MIMO communication systems.Proceedings of IEEE VTC03, October, 2003.373-377.) method etc.; Nonlinear precoding method comprises dirty paper code method (DPC, Dirty Paper Coding sees list of references 5 for details) and distortion thereof etc.
It is pointed out that above to have jurisdiction over a relay station altogether with two base stations be example, a specific embodiment of the present invention described in detail that those of ordinary skill in the art will be understood that and the invention is not restricted to this.Fringe region at two neighbor cells shown in Figure 2, can place a plurality of relay stations, thereby make one or more destination network devices (up base station or next of namely referring to jumped relay station, and descending mobile radio station or next of namely referring to jumped relay station) can obtain rf gain or spatial reuse or diversity gain.As shown in Figure 3, function and the relay station R1 shown in Fig. 2 of the reception detection decoding of these a plurality of relay stations execution and precoding transmission processing are identical.Can be on the basis of Fig. 1 relay station function between these a plurality of relay stations, a mobile radio station to their common services is realized grand diversity, distributed spatial reuse or Space Time Coding (STC, Space-Time Coding), to obtain rf gain or spatial reuse or diversity gain.
Here still with the descending example that is transmitted as, come two relay stations among the present invention are realized that the situation of distributed space time packet (DSTBC, Distributed Space-Time Block Coding) is described in detail.
Base station B2 is at t
1, t
2Two moment are sent the signal s to mobile radio station M3
11, s
12, base station B2 is at t
1, t
2Two moment are sent the signal s to mobile radio station M3 '
21, s
22, (certainly, just arrive mobile radio station M3 and mobile radio station M3 ' through relay station R1 and relay station R1 ' relaying).Use on the identical running time-frequency resource at those, detect interpretation method according to MIMO mentioned above, relay station R1 and relay station R1 ' can solve t separately
1S constantly
11And s
21, t
2S constantly
12And s
22
Relay station R1 is to issuing the signal s of mobile radio station M3
12, s
11Carrying out space-time block code, is example with the Alamouti sign indicating number, namely obtains the signal matrix to be sent 1 behind the Alamouti coding:
To issuing the signal s of mobile radio station M3 '
22, s
21Carry out the Alamouti coding, namely obtain the signal matrix to be sent 2 behind the Alamouti coding:
Wherein, the conjugation of " * " expression plural number.
Equally, relay station R1 ' carries out the space-time block code identical with relay station R1.
Suppose relay station R1 sends the row of first in signal matrix 1 to be sent and 2 signal to be sent
With
Namely at t
1' constantly send s
11And s
21, at t
2' send constantly
With
Relay station R1 ' sends second row signal to be sent in the signal matrix 1 to be sent and 2
With
Namely at t
1' constantly send s
12And s
22, at t
2' send constantly
With
In order to make mobile radio station M3 and mobile radio station M3 ' can receive the signal that sends to them respectively, relay station R1 need be to it at t
1' s that constantly sends
11, s
21With at t
2' send constantly
Carry out the SDMA precoding respectively.Relay station R1 ' need be to it at t
1' s that constantly sends
12, s
22With at t
2' send constantly
Carry out the SDMA precoding respectively.
According to formula (4), the pre-coding matrix of establishing among the relay station R1 is
H wherein
R1MFor two transmitting antenna RA1, the RA2 of relay station R1 to the channel transmission matrix between the reception antenna MA1 ' of the reception antenna MA1 of mobile radio station M3 and mobile radio station M3 ', a
1Be the power normalization coefficient, then two of relay station R1 antenna RA1 and RA2 go up at t
1' signal that constantly sends is
At t
2' signal that constantly sends is
Wherein, x
11, x
12Be respectively the signal of the transmission on t1 ' moment antenna RA1, the RA2, x
21, x
22Be respectively t
2' signal of the transmission on antenna RA1, the RA2 constantly.
Equally, carry out precoding in relay station R1 ', the pre-coding matrix of establishing relay station R1 ' is
H wherein
R1 ' MFor two transmitting antenna RA1 ', the RA2 ' of relay station R1 ' to the channel transmission matrix between the reception antenna MA1 ' of the reception antenna MA1 of mobile radio station M3 and mobile radio station M3 ', a
1 'Be the power normalization coefficient, then two of relay station R1 ' antenna RA1 ' and RA2 ' go up at t
1' signal that constantly sends is
At t
2' signal that constantly sends is
Wherein, x '
11, x '
12Be respectively t
1' signal of the transmission on antenna RA1 ', the RA2 ' constantly, x '
21, x '
22Be respectively t
2' signal of the transmission on antenna RA1 ', the RA2 ' constantly.
Because the acting in conjunction (with reference to formula (5), (6)) of pre-coding matrix and channel transmission matrix makes mobile radio station M3 at t
1' constantly receive only the s that relay station R1 sends
11S with relay station R1 ' transmission
12, at t
2' constantly receive only that relay station R1 sends
Send with relay station R1 '
Thereby constitute complete Alamouti code signal.Equally, mobile radio station M3 ' is at t
1' constantly receive only the s that relay station R1 sends
21S with relay station R1 ' transmission
22, at t
2' constantly receive only that relay station R1 sends
Send with relay station R1 '
Thereby constitute complete Alamouti code signal.
It is to be noted, the invention is not restricted to Fig. 2 and the application scenarios of being had jurisdiction over one or more relay stations by two base stations altogether shown in Figure 3, also can in a residential quarter, place the relay station with many antennas, relay station is only administered by the base station of this residential quarter of administration, relay station can be supported a plurality of mobile radio stations at same running time-frequency resource, when expanding the coverage area, also increase power system capacity like this, as shown in Figure 4, when downlink transfer, form a mimo system between base station B2 and the relay station R1, form a descending multi-user mimo system between relay station R1 and mobile radio station M3 and the mobile radio station M3 '; When uplink, form the uplink multi-users mimo system between mobile radio station M3 and mobile radio station M3 ' and the relay station R1, form a mimo system between relay station R1 and the base station B2.Via relay station R1 relaying, base station B2 can communicate by letter with mobile radio station M3 ' with mobile radio station M3 on identical running time-frequency resource.Thereby under the situation of not sacrificing running time-frequency resource, improve power system capacity and coverage effectively.And, owing to adopted relay station R1, the close together between mobile radio station M3 and mobile radio station M3 ' and the relay station R1, the transmitting power of also having saved mobile radio station M3 and mobile radio station M3 '.
In addition, source network device or destination network device via the communication of relay station relays among the present invention are not limited to base station B2 and B2 ' or mobile radio station M3 and M3 ', and as shown in Figure 5, source network device or destination network device also can be that another jumps relay station R.
Need to prove the signal s in the above-mentioned formula in addition
1, s
2Be generally symbol level modulation signal (as QAM, QPSK modulation symbol etc.), in the OFDMA system, be the symbol level modulation signal on the single sub-carrier, a running time-frequency resource may comprise a plurality of such modulation signals.When relay station R1 receives from the multiplicity of source networks device signal, need aforesaid MIMO to detect decoding to each modulation symbol in the identical running time-frequency resource that takies; When relay station R1 sends different signals to a plurality of destination network devices, to carry out aforesaid multi-user SDMA precoding processing to each modulation symbol in the identical running time-frequency resource that takies.Relay station R1 can directly utilize described multi-user SDMA precoding technique that each symbol level modulation signal is transmitted to corresponding destination network device after the mixed signal that receives being carried out draw each symbol level modulation signal after MIMO detects decoding; Also can continue the symbol level modulation signal is carried out channel decoding is the bit-level data message, to correct some error bits that may exist, when sending, earlier bit information is carried out chnnel coding, carries out obtaining the symbol level signal after the symbol-modulated then, and then utilize multi-user SDMA precoding technique that each symbol level signal to be sent is carried out precoding processing and change radiofrequency signal into sending to corresponding destination network device.
Another need to prove, though more than be example with two neighbor cells, the present invention is described in detail, those of ordinary skill in the art will be understood that, the present invention also is applicable to the adjacent situation in N residential quarter (N＞=3), and at this moment, relay station R1 is administered jointly by N base station.Usually, the number of relay station reception antenna is greater than the number that equals the data flow that will receive, and the number of transmitting antenna is greater than the number of the data flow that equals to be sent.Another need to prove since relay station send signal and receive signal be timesharing (as tdd systems, TDD) or frequency division (as frequency division duplex system, FDD) carry out, therefore, transmitting antenna and reception antenna can share.
Fig. 6 shows according to a specific embodiment of the present invention and be used for the flow chart that signal is transmitted in the relay station of cordless communication network.Following reference network topology structure figure shown in Figure 2 comes the flow process that the signal among the relay station R1 is transmitted is described in detail.
At first, in step S11, relay station R1 judges whether take partly or entirely identical running time-frequency resource when a plurality of network equipments are communicated by letter with this relay station.
If described a plurality of network equipment takies partly or entirely identical running time-frequency resource when communicating by letter with this relay station, in step S12, relay station R1 handles with the signal of communication of this relay station on these partly or entirely identical running time-frequency resources described a plurality of network equipments based on pre-defined rule so.On those different running time-frequency resources, relay station R1 directly handles the signal of communication on running time-frequency resource separately.This processing with existing relay station of serving a network equipment is similar, and the present invention repeats no more.
Signal forwarding process at identical running time-frequency resource shown in Figure 6 has comprised two kinds of situations: first kind of situation: relay station R1 is at the signal of some identical running time-frequency resources receptions from different source network devices; Second kind of situation: relay station R1 sends different signals to a plurality of destination network devices at some identical running time-frequency resources.Followingly respectively the processing situation of relay station under these two kinds of situations is described in detail with reference to Fig. 2.
1. first kind of situation:
With reference to network topology structure shown in Figure 2, in down link, first kind of situation comprises particularly: relay station R1 receives the signal that is sent to mobile radio station M3 and mobile radio station M3 ' by base station B2 and base station B2 ' respectively at some identical running time-frequency resources; In up link, first kind of situation comprises particularly: relay station R1 receives the signal that is sent to base station B2 and base station B2 ' by mobile radio station M3 and mobile radio station M3 ' respectively at some identical running time-frequency resources.
Be example with the down link below, the handling process among the relay station R1 is elaborated.
At first, relay station R1 judges whether and will receive respectively the signal that sends to mobile radio station M3 and mobile radio station M3 ' from base station B2 and base station B2 ' at some identical running time-frequency resources.Particularly, a kind of judgment mode is to judge according to the running time-frequency resource mapping signaling of base station B2 and base station B2 ' transmission.
If relay station R1 (is that base station B2 sends signal with base station B2 ' at some identical running time-frequency resources at the signal that some identical running time-frequency resources receive from base station B2 and base station B2 ', claim that its mixed signal is space division multiplex signal), need carry out MIMO to the channel related information of relay station R1 to the space division multiplexing mixed signal that receives based on first pre-defined rule and base station B2 and base station B2 ' and detect decoding, separating with signal from base station B2 ' from base station B2.
Particularly, first pre-defined rule refers to that MIMO detects interpretation method, mainly is divided into linear and non-linear two class methods, and common linearity test interpretation method comprises ZF method, least mean-square error method etc., and their various distortion, simplification; Common non-linear detection interpretation method is included in and further adopts interference cancellation techniques on the basis of ZF, least mean-square error method, and maximum likelihood method and various simplification distortion thereof etc.
Particularly, channel related information comprises channel transmission matrix or the various forms of channel transmission coefficient, for example H in the formula (2) that the channel transmission coefficient constitutes
BR, preferably, the channel transmission coefficient is the instantaneous estimation value.
Relay station R1 obtains base station B2 and base station B2 ' to be had multiple to the mode of the channel related information of relay station R1.Normally relay station R1 according to predetermined pilot signal estimate base station B2 and base station B2 ' to the channel transmission coefficient of relay station R1 as the required channel related information of decoding.Particularly, how the channel transmission coefficient estimates it should is the general knowledge that those of ordinary skills should know, and the present invention just no longer describes in detail.
Relay station R1 is obtaining base station B2 and base station B2 ' to the channel transmission coefficient of relay station R1, can carry out MIMO to the spatial reuse mixed signal that receives based on the ZF method shown in for example formula (2) and detect decoding, to separate the signal from base station B2 and base station B2 '.
2. second kind of situation:
With reference to network topology structure shown in Figure 2, in down link, second kind of situation comprises particularly: relay station R1 sends a signal to mobile radio station M3 and mobile radio station M3 ' at some identical running time-frequency resources.In up link, second kind of situation comprises particularly: relay station R1 sends a signal to base station B2 and base station B2 ' at some identical running time-frequency resources.
Be example with the down link still below, the handling process among the relay station R1 is elaborated.
At first, the relay station R1 signal that sends to mobile radio station M3 and mobile radio station M3 ' by base station B2 and base station B2 ' that judges whether will to receive on some identical running time-frequency resources sends to mobile radio station M3 and mobile radio station M3 '.Particularly, a kind of judgment mode is to judge according to the running time-frequency resource mapping signaling of base station B2 and base station B2 ' transmission.
If relay station R1 need send a signal to mobile radio station M3 and mobile radio station M3 ' at some identical running time-frequency resources, need carry out precoding to signal to be sent on some identical running time-frequency resources at this based on second pre-defined rule so, so that each mobile radio station receives only the signal that sends to it as much as possible, and less receive the signal that sends to other mobile radio station at same running time-frequency resource.
Particularly, second pre-defined rule refers to multi-user SDMA precoding processing, mainly be divided into linear and non-linear two class methods, common linear pre-coding method comprises inverse channel ZF method, least mean-square error method, block diagonalization ZF method, beam shaping method or based on predetermined codes calligraphy etc., and their various distortion, simplification, as multi-user features mode transfer method etc.; Common nonlinear precoding method comprises dirty paper code method and distortion thereof etc.
Particularly, the coefficient of precoding processing or pre-coding matrix can be definite according to channel related information, as shown in Equation (4).Wherein channel related information includes but not limited to: the channel transmission matrix that relay station R1 constitutes to the instantaneous of mobile radio station M3 and mobile radio station M3 ' or statistics obtains when long channel transmission coefficient; Perhaps according to the numbering of relay station R1 to the instantaneous of mobile radio station M3 and mobile radio station M3 ' or the predetermined code book that the channel transmission coefficient is determined when long, certainly, under this situation, prestore the information of predetermined code book among the relay station R1.In addition, those of ordinary skill in the art should know other various forms that channel related information also comprises the channel related information that various precoding processing such as the covariance matrix of channel transmission coefficient and characteristic vector are taked, and the present invention enumerates no longer one by one.
Relay station R1 obtains its mode to the channel related information of the channel of mobile radio station M3 and mobile radio station M3 ' to be had multiple.A kind of possible implementation is as follows: mobile radio station M3 and mobile radio station M3 ' estimate relay station R1 to their channel transmission coefficient according to predetermined pilot signal, and will feed back to relay station R1 through the channel transmission coefficient that quantizes; Perhaps mobile radio station M3 and mobile radio station M3 ' will select the numbering of predetermined code book to feed back to relay station R1 according to channel transmission coefficient separately; For the channel (as tdd systems) of uplink downlink symmetry, can also estimate it to the channel transmission coefficient of mobile radio station M3 and mobile radio station M3 ' by upward signal by relay station R1 self, determine the precoding coefficient according to for example formula (4) then.Particularly, the channel transmission coefficient how to estimate and mobile radio station M3 and mobile radio station M3 ' how the numbering (can consult list of references 8) of feedback channel transmission coefficient or the predetermined code book determined to the channel transmission coefficient of mobile radio station M3 and mobile radio station M3 ' according to relay station R1 should be the general knowledge that those of ordinary skills should know, the present invention just no longer describes in detail.
For the sight as Fig. 3 and the network topology structure that a plurality of relay stations are arranged shown in Figure 5, each relay station judges according to the indication of base station B2 or base station B2 ' whether it needs to send different signals to different destination network devices at identical running time-frequency resource jointly with other one or more relay stations.A plurality of relay stations can be carried out and the identical function of relay station R1 shown in Figure 2, so that destination network device obtains higher radio frequency and diversity gain, namely a plurality of relay stations are carried out grand diversity feature.Certainly, a plurality of relay stations also can be carried out distributed spatial reuse or Space Time Coding on the basis of aforesaid precoding, to obtain better multiplexing or diversity gain.
Fig. 7 shows the structured flowchart that is used for the retransmission unit 10 of signal forwarding according to a specific embodiment of the present invention in the common linchpin relay station of cordless communication network.This retransmission unit 10 comprises judgment means 11, processing unit 12, first deriving means 13, second deriving means 14.Need to prove, for for simplicity, sub-device in many preferred embodiments is shown among Fig. 7 in the lump, those skilled in the art will be understood that according to the instruction of this specification, wherein only judgment means 11 and processing unit 12 are to realize the necessary device of the present invention, and other sub-device is option means.The process that following reference network topology structure figure shown in Figure 2 comes the retransmission unit 10 among the relay station R1 to be carried out the signal forwarding is described in detail.
At first, judgment means 11 judges whether take partly or entirely identical running time-frequency resource when a plurality of network equipments are communicated by letter with this relay station.
If described a plurality of network equipment takies partly or entirely identical running time-frequency resource when communicating by letter with this relay station, processing unit 12 advances to handle with the signal of communication of this relay station on partly or entirely identical running time-frequency resource to described a plurality of sources or destination network device based on pre-defined rule.
The above-mentioned process of transmitting at the signal of identical running time-frequency resource has comprised two kinds of situations: first kind of situation: relay station R1 is at the signal of some identical running time-frequency resources receptions from different source network devices; Second kind of situation: relay station R1 sends different signals to a plurality of destination network devices at some identical running time-frequency resources.Followingly respectively the processing procedure of the retransmission unit 10 among the relay station R1 under these two kinds of situations is described in detail with reference to Fig. 2.
1. first kind of situation:
With reference to network topology structure shown in Figure 2, in down link, first kind of situation comprises particularly: relay station R1 receives the signal that is sent to mobile radio station M3 and mobile radio station M3 ' by base station B2 and base station B2 ' respectively at some identical running time-frequency resources; In up link, first kind of situation comprises particularly: relay station R1 receives the signal that is sent to base station B2 and base station B2 ' by mobile radio station M3 and mobile radio station M3 ' respectively at some identical running time-frequency resources.
Be example below with the down link, the processing procedure of retransmission unit 10 is elaborated.
At first, judgment means 11 judges whether and will receive respectively the signal that sends to mobile radio station M3 and mobile radio station M3 ' from base station B2 and base station B2 ' at some identical running time-frequency resources according to the running time-frequency resource mapping signaling from base station B2 and base station B2 '.
If relay station R1 (is that base station B2 sends signal with base station B2 ' at some identical running time-frequency resources at the signal that some identical running time-frequency resources receive from base station B2 and base station B2 ', claim that its mixed signal is space division multiplex signal), processing unit 12 carries out MIMO to the channel related information of relay station R1 to the space division multiplexing mixed signal that receives based on first pre-defined rule and base station B2 and base station B2 ' and detects decoding, separating with signal from base station B2 ' from base station B2.
Particularly, first pre-defined rule refers to that MIMO detects interpretation method, mainly is divided into linear and non-linear two class methods, and common linearity test interpretation method comprises ZF method, least mean-square error method etc., and their various distortion, simplification; Common non-linear detection interpretation method is included in and further adopts interference cancellation techniques on the basis of ZF, least mean-square error method, and maximum likelihood method and various simplification distortion thereof etc.
Particularly, channel related information comprises channel transmission matrix or various other forms of channel transmission coefficient, for example H in the formula (2) that the channel transmission coefficient constitutes
BR, preferably, the channel transmission coefficient is the instantaneous estimation value.
Preferably, transmitting device 10 comprises that also first deriving means, 13, the first deriving means 13 obtain base station B2 and base station B2 ' and have multiple to the mode of the channel related information of relay station R1.Common first deriving means 12 according to predetermined pilot signal estimate base station B2 and base station B2 ' to the channel transmission coefficient of relay station R1 as the required channel related information of decoding.Particularly, how the channel transmission coefficient estimates it should is the general knowledge that those of ordinary skills should know, and the present invention just no longer describes in detail.
Relay station R1 is obtaining base station B2 and base station B2 ' to the channel transmission coefficient of relay station R1, can detect decoding to the spatial reuse mixed signal that receives based on the ZF method shown in for example formula (2), to separate the signal from base station B2 and base station B2 '.
2. second kind of situation:
With reference to network topology structure shown in Figure 2, in down link, second kind of situation comprises particularly: relay station R1 sends a signal to mobile radio station M3 and mobile radio station M3 ' at some identical running time-frequency resources.In up link, second kind of situation comprises particularly: relay station R1 sends a signal to base station B2 and base station B2 ' at some identical running time-frequency resources.
Be example with the down link still below, the handling process among the relay station R1 is elaborated.
At first, judgment means 11 sends to mobile radio station M3 and mobile radio station M3 ' according to the signal that sends to mobile radio station M3 and mobile radio station M3 ' by base station B2 and base station B2 ' of judging from the running time-frequency resource mapping signaling of base station B2 and base station B2 ' whether relay station R1 will will receive on some identical running time-frequency resources.
If relay station R1 need send a signal to mobile radio station M3 and mobile radio station M3 ' at some identical running time-frequency resources, processing unit 12 need carry out precoding based on second pre-defined rule to sent signal on these identical running time-frequency resources so, so that each mobile radio station receives only the signal that sends to it as much as possible, and less receive the signal that sends to other mobile radio station at same running time-frequency resource.
Particularly, second pre-defined rule refers to multi-user SDMA precoding processing, mainly be divided into linear and non-linear two class methods, common linear pre-coding method comprises inverse channel ZF method, least mean-square error method, block diagonalization ZF method, beam shaping method or based on predetermined codes calligraphy etc., and their various distortion, simplification, as multi-user features mode transfer method etc.; Common nonlinear precoding method comprises dirty paper code method and distortion thereof etc.。
Particularly, the coefficient of precoding processing or pre-coding matrix can be definite according to channel related information, as shown in Equation (4).Particularly, channel related information includes but not limited to: channel transmission matrix, covariance matrix and characteristic vector etc. that relay station R1 constitutes to the instantaneous of mobile radio station M3 and mobile radio station M3 ' or statistics obtains when long channel transmission coefficient; Perhaps according to the numbering (can consult list of references 8) of relay station R1 to the instantaneous of mobile radio station M3 and mobile radio station M3 ' or the predetermined code book that channel transmission matrix, covariance matrix and characteristic vector etc. are determined when long, certainly, under this situation, prestore the information of predetermined code book among the relay station R1.
Preferably, transmitting device 10 comprises that also second deriving means, 14, the second deriving means 14 obtain its relay station R1 and have multiple to the mode of the channel related information of a plurality of channels of mobile radio station M3 and mobile radio station M3 '.A kind of possible obtain manner is as follows: mobile radio station M3 and mobile radio station M3 ' estimate that according to predetermined pilot signal relay station R1 is to their channel transmission coefficient, and will feed back to second deriving means 14 through the channel transmission coefficient that quantizes, perhaps mobile radio station M3 and mobile radio station M3 ' select the numbering of predetermined code book and numbering are fed back to second deriving means 14 according to channel transmission coefficient separately; Channel (as tdd systems) for the uplink downlink symmetry, can also estimate its relay station R1 to the channel transmission coefficient of mobile radio station M3 and mobile radio station M3 ' by upward signal by second deriving means 14, determine the precoding coefficient according to for example formula (4) then.Particularly, how the channel transmission coefficient estimates and mobile radio station M3 and mobile radio station M3 ' feedback channel transmission coefficient or determine that to the channel transmission coefficient of mobile radio station M3 and mobile radio station M3 ' numbering of predetermined code book should be the general knowledge that those of ordinary skills should know according to relay station R1 how that the present invention just repeats no more.
For the sight as Fig. 3 and the network topology structure that a plurality of relay stations are arranged shown in Figure 5, judgment means 11 judges according to the indication of base station B2 or base station B2 ' whether it needs to send different signals to different destination network devices at identical running time-frequency resource jointly with other one or more relay stations.
A plurality of relay stations can be carried out and the identical function of relay station R1 shown in Figure 2, so that destination network device obtains higher radio frequency and diversity gain, namely a plurality of relay stations are carried out grand diversity feature.Certainly, a plurality of relay stations also can be carried out distributed spatial reuse or Space Time Coding on aforesaid precoding basis, to obtain better multiplexing or diversity gain.
More than specific embodiments of the invention are described.It will be appreciated that the present invention is not limited to above-mentioned specific implementations, those skilled in the art can make various distortion or modification within the scope of the appended claims.
Claims (18)
1. one kind is used for signal forwarding method in the relay station of cordless communication network, and wherein, this relay station comprises that many receive and transmitting antenna, is characterized in that this method may further comprise the steps:
A. judge and whether take partly or entirely identical running time-frequency resource when a plurality of network equipments are communicated by letter with this relay station;
If take partly or entirely identical running time-frequency resource when b. described a plurality of network equipment is communicated by letter with this relay station, based on pre-defined rule and according to the channel related information of a plurality of channels between described a plurality of network equipments and this relay station the signal of communication on described partly or entirely identical running time-frequency resource between described a plurality of network equipments and this relay station is handled, wherein said pre-defined rule comprises that MIMO detects decoding rule or multi-user SDMA precoding rule.
2. method according to claim 1 is characterized in that, described step a is further comprising the steps of:
-judge that whether this relay station receives signal from described a plurality of network equipments at described partly or entirely identical running time-frequency resource;
Described pre-defined rule comprises that MIMO detects decoding rule, and described step b is further comprising the steps of:
If-this relay station receives signal from described a plurality of network equipments at described all or part of identical running time-frequency resource, based on MIMO detection decoding rule and according to described a plurality of network equipments to the channel related information of a plurality of channels of this relay station the mixed signal that comprises a plurality of network equipments transmission signals that this relay station receives is handled, to obtain the signal from each network equipment respectively.
3. method according to claim 2 is characterized in that, and is further comprising the steps of before described step b:
-obtain described a plurality of network equipment to the channel related information of a plurality of channels of this relay station.
4. method according to claim 1 is characterized in that, described step a is further comprising the steps of:
-judge whether this relay station need send different signals to described a plurality of network equipments on described partly or entirely identical running time-frequency resource;
Described pre-defined rule comprises multi-user SDMA precoding rule, and described step b is further comprising the steps of:
If-this relay station need send different signals to described a plurality of network equipments on described partly or entirely identical running time-frequency resource, based on multi-user SDMA precoding rule and according to this relay station to the channel related information of a plurality of channels of described a plurality of network equipments the different signal that this relay station needs send to described a plurality of network equipments is carried out precoding processing.
5. method according to claim 4 is characterized in that, described step a is further comprising the steps of:
-judge whether this relay station need send different signals to described a plurality of network equipments jointly with one or more other relay stations on described partly or entirely identical running time-frequency resource;
Described step b is further comprising the steps of:
If-this relay station need send different signals to described a plurality of network equipments jointly with one or more other relay stations on described partly or entirely identical running time-frequency resource, based on multi-user SDMA precoding rule and according to this relay station to the channel related information of a plurality of channels of described a plurality of network equipments the different signal that this relay station needs send to described a plurality of network equipments is carried out precoding processing, to send different signals to described a plurality of network equipments with one or more other relay stations are common.
6. according to claim 4 or 5 described methods, it is characterized in that, further comprising the steps of before described step b:
-obtain this relay station to the channel related information of a plurality of channels of described a plurality of network equipments.
7. method according to claim 1, described MIMO detects decoding rule and comprises in the following each:
-ZF method;
-Minimum Mean Square Error method;
-maximum likelihood method.
8. method according to claim 1, described multi-user SDMA precoding rule comprises each in the following:
-beam shaping method;
-inverse channel ZF method;
-least mean-square error method;
-block diagonalization ZF method;
-dirty paper code method;
-based on the predetermined codes calligraphy.
9. method according to claim 1, the described network equipment comprises each in the following:
-a plurality of base stations;
-a plurality of mobile radio stations;
-a plurality of relay stations;
-one or more relay stations and one or more base station;
-one or more relay stations and one or more mobile radio station.
10. one kind is used for the retransmission unit that signal is transmitted in the relay station of cordless communication network, and wherein, this relay station comprises that many receive and transmitting antenna, is characterized in that this retransmission unit comprises:
Judgment means is used for judging whether take partly or entirely identical running time-frequency resource when a plurality of network equipments are communicated by letter with this relay station;
Processing unit, if be used for taking when described a plurality of network equipments are communicated by letter with this relay station partly or entirely identical running time-frequency resource, based on pre-defined rule and according to the channel related information of described a plurality of network equipments and a plurality of channels of this relay station the signal of communication on described partly or entirely identical running time-frequency resource between described a plurality of network equipments and this relay station is handled, wherein said pre-defined rule comprises that MIMO detects decoding rule or multi-user SDMA precoding rule.
11. retransmission unit according to claim 10 is characterized in that, described judgment means also is used for:
-judge that whether this relay station receives signal from described a plurality of network equipments at described partly or entirely identical running time-frequency resource;
Described pre-defined rule comprises that MIMO detects decoding rule, and described processing unit also is used for:
If-this relay station receives signal from described a plurality of network equipments at described all or part of identical running time-frequency resource, based on MIMO detection decoding rule and according to described a plurality of network equipments to the channel related information of a plurality of channels of this relay station the mixed signal that comprises a plurality of network equipments transmission signals that this relay station receives is handled, to obtain the signal from each network equipment respectively.
12. retransmission unit according to claim 11 is characterized in that, also comprises:
First deriving means is used for obtaining a plurality of network equipments to the channel related information of a plurality of channels of this relay station.
13. retransmission unit according to claim 11 is characterized in that, described judgment means also is used for:
-judge whether this relay station need send different signals to described a plurality of network equipments on described partly or entirely identical running time-frequency resource;
Described pre-defined rule comprises multi-user SDMA precoding rule, and described processing unit also is used for:
If-this relay station need send different signals to described a plurality of network equipments on described partly or entirely identical running time-frequency resource, based on multi-user SDMA precoding rule and according to this relay station to the channel related information of a plurality of channels of described a plurality of network equipments the different signal that this relay station needs send to described a plurality of network equipments is carried out precoding processing.
14. retransmission unit according to claim 13 is characterized in that, described judgment means also is used for:
-judge whether this relay station need send different signals to described a plurality of network equipments jointly with one or more other relay stations on described partly or entirely identical running time-frequency resource;
Described processing unit also is used for:
If-this relay station need send different signals to described a plurality of network equipments jointly with one or more other relay stations on described partly or entirely identical running time-frequency resource, based on multi-user SDMA precoding rule and according to this relay station to the channel related information of a plurality of channels of described a plurality of network equipments the different signal that this relay station needs send to described a plurality of network equipments is carried out precoding processing, to send different signals to described a plurality of network equipments with one or more other relay stations are common.
15. according to claim 13 or 14 described retransmission units, it is characterized in that, also comprise:
Second deriving means is used for obtaining this relay station to the channel related information of a plurality of channels of described a plurality of network equipments.
16. retransmission unit according to claim 11, wherein, described MIMO detection decoding rule comprises each in the following:
-ZF method;
-Minimum Mean Square Error method;
-maximum likelihood method.
17. retransmission unit according to claim 13, described multi-user SDMA precoding rule comprises each in the following:
-beam shaping method;
-inverse channel ZF method;
-least mean-square error method;
-block diagonalization ZF method;
-dirty paper code method;
-based on the predetermined codes calligraphy.
18. retransmission unit according to claim 10, described a plurality of network equipments comprise each in the following:
-a plurality of base stations;
-a plurality of mobile radio stations;
-a plurality of relay stations;
-one or more relay stations and one or more base station;
-one or more relay stations and one or more mobile radio station.
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| PCT/CN2007/003682 WO2009079841A1 (en) | 2007-12-19 | 2007-12-19 | Signal forwarding method and apparatus serving in relay station of a plurality of network apparatuses |
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|---|---|---|---|---|
| US20020032031A1 (en) * | 2000-09-11 | 2002-03-14 | Hitachi, Ltd. | Fixed wireless access system and apparatus therefor |
| CN1996786A (en) * | 2006-11-29 | 2007-07-11 | 北京邮电大学 | Novel wireless communication networking method based on the relay technology |
| US20070201392A1 (en) * | 2006-02-28 | 2007-08-30 | Shyamal Ramachandran | System and method for managing communication routing within a wireless multi-hop network |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020032031A1 (en) * | 2000-09-11 | 2002-03-14 | Hitachi, Ltd. | Fixed wireless access system and apparatus therefor |
| US20070201392A1 (en) * | 2006-02-28 | 2007-08-30 | Shyamal Ramachandran | System and method for managing communication routing within a wireless multi-hop network |
| CN1996786A (en) * | 2006-11-29 | 2007-07-11 | 北京邮电大学 | Novel wireless communication networking method based on the relay technology |
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| JP特开2005-192185A 2005.07.14 |
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