CN101156335B - Wireless base station apparatus - Google Patents

Abstract

A wireless base station device comprises transmission weight creating sections for creating transmission weight information sets for spatial multiplex transmission by different algorithms from channel information on terminals each having one or more antennas used for spatial multiplex transmission and a beam selecting section for selecting one of the created transmission weight information sets. By using the selected transmission weight information as a transmission weight, assignment of terminal to be subjected to spatial multiplex connection can be simply performed, and the assigning time can be shortened.

Description

Radio base station apparatus

Technical field

The present invention relates to a plurality of terminal installations carry out the radio base station apparatus of spatial reuse transmission, corresponding to the terminal installation of spatial reuse transmission and relevant their wireless communications method.

Background technology

In recent years, the high capacity of radio communication, the requirement of high speed grow to even greater heights, and the research of method of effective utilization ratio that further improves limited frequency resource is in mushroom development.As the method for one of them, utilize the method for area of space noticeable.

Utilize one of technology as area of space; Be active antenna (adaptive antenna), adjust its amplitude and phase place through the weight coefficient that carries out multiplying to received signal, thereby the signal that the reception of enhancing ground will receive originally (below; Be called ' expectation ripple signal '); And, reduce same channel disturbance through suppressing the disturbing wave signal, can improve power system capacity.

In addition; Utilize one of technology as area of space; Have through utilizing the orthogonality in the space in the propagation path, use the physical channel of synchronization, same frequency, identical code, different data sequences is transferred to the spatial reuse transmission technology of different terminal device.

At non-patent literature 1 (T.Ohgane et al, " A study on a channel allocation schemewith an adaptive array in SDMA, " IEEE 47th VTC; Page.725-729; Vol.2 (1997)) etc. in, the spatial reuse transmission technology has been carried out information disclosure, in the space segmentation multiplexing transmission radio base station apparatus and terminal installation that adopt this technology; If the space correlation coefficient between terminal installation is lower than setting; Then can carry out the space segmentation multiplexing transmission, can improve the throughput of wireless communication system, can improve the user simultaneously and hold number.

But; In the structure of in the past space segmentation multiplexing transmission radio base station apparatus and terminal installation; Space correlation coefficient in radio base station apparatus between necessary sense terminals device; Go forward side by side and be about to space correlation coefficient (below, this ' selections ' action is called ' distribution ') controls than being chosen as the terminal installation that should spatial reuse connects between the little terminal installation of setting.

In addition, space correlation coefficient has because of the moving of mobile or peripheral thing of communication environments along with terminal installation changes, thus the character that changes along with the time, so must more frequently or termly detect, upgrade space correlation coefficient.Therefore, exist the detection of space correlation coefficient to handle and the complicated problem of allocation process of the terminal installation that should spatial reuse connects.In addition, also exist processing delay to follow this complicated and elongated problem.

Summary of the invention

Radio base station apparatus of the present invention comprises: a plurality of Transmit weight generate part; Based on for should spatial reuse the channel information of a plurality of terminal installations of transmission, be created on employed Transmit weight information in the formation of the transmission wave beam that said a plurality of terminal installations are sent through different algorithms; The beam selection part, any one of a plurality of said Transmit weight information of selecting to generate through said algorithm; And the transmission wave beam forms part; Adopt selected said Transmit weight information; Form said transmission wave beam; Said beam selection part based on notify by said terminal installation, expression comprised the information of signal and the power ratio of interference noise in the said terminal installation of other area interference information, selection Transmit weight information.

Wireless communications method of the present invention; Comprise: always in the reception signal of self terminal device; Extract the channel information between said terminal installation and the radio base station apparatus, ask the step of the space correlation coefficient between a plurality of terminal installations of answering the spatial reuse transmission based on the channel information that is extracted; And make the alms giver of other-end device disturbed to minimal algorithm from employing and generate the first step of Transmit weight, the constraints that adopts the additional alms giver who is used to reduce to the other-end device to disturb; Generation is used for improving the algorithm of the Transmit weight of the quality of reception of the terminal installation of regulation is generated the third step that second step of Transmit weight, the algorithm that is used to generate single Transmit weight generate Transmit weight; Based on the selection processing method that is predetermined; The space correlation coefficient of obtaining according to the step of asking said space correlation coefficient; From three steps that generate said Transmit weight, select the best step of communication quality.

Description of drawings

According to this structure; When the spatial reuse for a plurality of terminal installations sends; According to by various space correlation situation that channel information detected, between terminal installation, can from the suitable Transmit weight that a plurality of different received weight generating algorithms are generated, select only Transmit weight.Therefore,, can carry out sane spatial reuse and send, simplify allocation process based in the past space correlation coefficient for the space correlation situation of terminal room.Simplification along with this processing; Can provide and to simplify radio base station apparatus, shorten the processing time be used for the control of space segmentation multiplexing transmission, the radio base station apparatus, terminal installation and the wireless communications method that have the effect of the power system capacity of improving the space segmentation multiplexing transmission simultaneously.

Fig. 1 is the radio base station apparatus of embodiment of the present invention 1 and the structure chart of terminal installation.

Fig. 2 A is the detailed structure view of the terminal installation of a plurality of receiving element antennas of having of embodiment of the present invention 1.

Fig. 2 B is the detailed structure view of the terminal installation with a receiving element antenna of embodiment of the present invention 1.

Fig. 3 is the flow chart of the space segmentation multiplexing transmission action of expression embodiment of the present invention 1.

Fig. 4 A is the antenna element configuration figure of employed wireless base station antenna in the emulation that concerns between expression coefficient correlation and the communication quality in the three mode algorithms of embodiment of the present invention 1.

Fig. 4 B is the antenna element configuration figure of employed receiving element antenna in the emulation that concerns between expression coefficient correlation and the communication quality in the three mode algorithms of embodiment of the present invention 1.

Fig. 4 C is the illustraton of model of the radio wave propagation state between employed wireless base station antenna and receiving element antenna in the emulation that concerns between expression coefficient correlation and the communication quality in the three mode algorithms of expression embodiment of the present invention 1.

Fig. 4 D is the illustraton of model of the distolateral beamwidth of employed transmission in the emulation of coefficient correlation and communication quality in the three mode algorithms of expression embodiment of the present invention 1.

Fig. 4 E is the illustraton of model of the distolateral beamwidth of employed reception in the emulation of coefficient correlation and communication quality in the three mode algorithms of expression embodiment of the present invention 1.

Fig. 5 is the figure of the simulated conditions of expression embodiment of the present invention 1.

The curve chart of the coefficient correlation when Fig. 6 is bad think of (Rice) COEFFICIENT K=3dB of three mode algorithms of expression embodiment of the present invention 1 and the simulation result of communication quality.

The curve chart of the coefficient correlation when Fig. 7 is bad think of (Rice) COEFFICIENT K=6dB of three mode algorithms of expression embodiment of the present invention 1 and the simulation result of communication quality.

The curve chart of the coefficient correlation when Fig. 8 is bad think of (Rice) COEFFICIENT K=9dB of three mode algorithms of expression embodiment of the present invention 1 and the simulation result of communication quality.

Fig. 9 A carries out the sketch map that time shaft and spatial axes are represented with the space segmentation multiplexing transmission state that the 1st of embodiment of the present invention 1 is sent sequence of data frames.

Fig. 9 B is the structure chart that the 1st of embodiment of the present invention 1 is sent sequence of data frames.

Figure 10 A carries out the sketch map that time shaft and spatial axes are represented with the space segmentation multiplexing transmission state that the 2nd of embodiment of the present invention 1 is sent sequence of data frames.

Figure 10 B is the structure chart that the 2nd of embodiment of the present invention 1 is sent sequence of data frames.

Figure 11 is the radio base station apparatus of embodiment of the present invention 2 and the structure chart of terminal installation.

Figure 12 is the structure chart of the radio base station apparatus of embodiment of the present invention 3.

Figure 13 is the structure chart of the terminal installation of embodiment of the present invention 3.

Figure 14 is the structure chart of the radio base station apparatus of embodiment of the present invention 4.

Figure 15 is the structure chart of the terminal installation of embodiment of the present invention 4.

Figure 16 is another structure chart of the terminal installation of embodiment of the present invention 4.

Label declaration

1,100 radio base station apparatus

2-1,2-2,2-s, 2-A, 2-B terminal installation

3-1,3-2,3-s sends signal and generates part

4 channel informations are obtained part

5 Transmit weight deciding section

6-1,6-2, the 6-n Transmit weight generates part

7 beam selection parts

8 transmitted power deciding section

9 send wave beam forms part

11-1,11-2,11-s, 60 wireless base station antenna

20-1,20-m, 62 receiving element antennas

107-a, 107-b selector switch part

216 transmitting element antennas

221-1, the 221-m receiving unit

222 channel estimating parts

223 spatial reuse separating parts

224 demodulation parts

Embodiment

Below, with reference to accompanying drawing radio base station apparatus and the terminal installation of embodiment of the present invention on one side be described on one side.

Here; In the explanation afterwards; Have structure division or the unit or the device of a plurality of same structure elements, in the time of in explanation, need not representing to be which structure division or unit or device, use same label; If additional label does not then add the 2nd label of dash line when just explanation is difficult for knowing the 1st label after on the various piece of a plurality of structure divisions or each unit or each device.

For example, even do not show it is that which device also can be understood when explaining, just claim terminal installation 2, and when indigestion is explained, be also referred to as terminal installation 2-1,2-2,2-s.

(execution mode 1)

Fig. 1 representes the structure of the radio base station apparatus and the terminal installation of embodiment of the present invention 1.In Fig. 1, terminal installation 2-1～2-s has respectively: a plurality of antenna 20-1～20-j, a plurality of antenna 20-1～20-k, a plurality of antenna 20-1～20-s, but also can have only an antenna.At the receiving terminal of terminal installation, Fig. 2 A representes to have the detailed structure view of the terminal installation of a plurality of antennas, and Fig. 2 B representes to have only the detailed structure view of the terminal installation of an antenna.

Fig. 1 is the radio base station apparatus 1 of expression embodiment of the present invention 1 and the structure chart of terminal installation 2-1～2-s.Below, in this execution mode, explain from radio base station apparatus 1 in the transmission of terminal installation 2-1～2-s (below, be called down link), the situation (wherein, Ns >=s, Ns are natural number) of sending Ns spatial flow to s terminal installation.

In Fig. 1, the radio base station apparatus 1 of embodiment of the present invention 1 comprises: send signal and generate part 3-1～3-s, generate to the transmission data sequence as the terminal installation 2-1～2-s of the object that should carry out the space segmentation multiplexing transmission; Channel information is obtained part 4, always in the reception signal of self terminal device 2-1～2-s, extracts the channel information of down link; Transmit weight deciding section 5; It is the weight deciding section of decision Transmit weight; Form by Transmit weight generation part 6-1～6-n and beam selection part 7; Transmit weight generates part and generates Transmit weight information based on a plurality of different generating algorithms, and the beam selection part is selected only Transmit weight information among Transmit weight generates a plurality of Transmit weight ensemble that part 6-1～6-n generated; Transmitted power deciding section 8 based on selected Transmit weight information, determines the transmitted power of each spatial flow, and transmission power control information is sent; Send wave beam and form part 9,, use selected Transmit weight information, each is sent data sequence multiply by Transmit weight, and be high-frequency signal the signal transformation after the multiplying in order to form specific transmission wave beam; Power coefficient multiplier 10-1～10-s based on the transmission power control information of each spatial flow that is determined by transmitted power deciding section 8, generates the power coefficient of the output signal times of part 3-1～3-s with regulation for sending signal; And wireless base station antenna 11-1～11s, will be transmitted into not shown transmission medium from the high-frequency signal that sends wave beam formation part 9.

In Fig. 2 A, in the receiving terminal of terminal installation, the terminal installation 2-A with embodiment of the present invention 1 of a plurality of antennas comprises: transmitting element 210 and transmitting element antenna 216 and receiving element 220 and receiving element antenna 20-1～20-m.

Transmitting element 210 comprises: data input unit 214, and it is used for the data message that the input terminal user will send; And transmitting section 212, the channel estimating information of sending from channel estimating part 222 is applied predetermined data handle, and be transformed to high-frequency signal.

Receiving element 220 comprises: receiving unit 221-1～221-m, and corresponding with receiving element antenna 20-1～20-m respectively, the high-frequency signal that receiving element antenna 20-1～20-m is received is transformed to baseband signal; Channel estimating part 222 is estimated the channel response message of the propagation path the down link from a plurality of baseband signals; Spatial reuse separating part 223 is based on from the spatial reuse signal, separated, extracted expectation ripple signal by channel response message that channel estimating part 222 obtained; From separate of the expectation ripple signal that receives, restore sending data sequence demodulation part 224; And data output section divides 225, the receiving data sequence that is restored outputed to other equipment, or the terminal installation user is transmitted this information.

Here, transmitting element antenna 216 is handled as different antennas with receiving element antenna 20-1～20-m, but also can be shared identical antenna.

In Fig. 2 B, in the receiving terminal of terminal installation, have only the terminal installation 2-B of the embodiment of the present invention 1 of an antenna to comprise: transmitting element 210 and transmitting element antenna 216 and receiving element 230 and receiving element antenna 20-1.

Be that with the different of Fig. 2 A in receiving element 230, terminal installation 2-B has only single receiving element antenna 20-1, so be not comprise the structure of removing the spatial reuse separating part 223 of processing as the interference of area of space.Same with Fig. 2 A, transmitting element antenna 216 is handled as different antennas with receiving element antenna 20-1, but also can be shared identical antenna.

Below, the action of relevant radio base station apparatus 1 and terminal installation 2-A or 2-B is described.At first, estimate as prerequisite at terminal installation 2-1～2-s that the action of this information is notified in summary description to radio base station apparatus 1 with the channel information of down link.

At first; In the transmitting element 210 of terminal installation 2-A or 2-B; Channel information by the estimated propagation path (not shown) of channel estimating part 222 is directed to transmitting section 212, by transmitting section 212 through control channel or report channel and be sent to radio base station apparatus 1.That is, the control channel signals that channel information loaded or report channel signal and be directed to transmitting element antenna 216 is transmitted into propagation path (not shown) to radio base station apparatus 1 from transmitting element antenna 216.

Here; Control channel or to report channel be the communication channel that the information that is used to make radio base station apparatus 1 and terminal installation 2-A or 2-B to move is is effectively come and gone, the communication channel of contact that will send the information of reception with the user who is used for terminal installation 2-A or 2-B is a different communication channel.

Have again; The information that the user of terminal installation 2-A or 2-B will send is imported into transmitting section 212 from data input unit 214; The signal processing that it is stipulated, and after being transformed to high-frequency signal, be sent to radio base station apparatus 1 through transmitting element antenna 216.

Then; In radio base station apparatus 1 channel information obtain part 4 from a plurality of terminal installation 2-1～2-s with terminal installation 2-A or 2-B structure to control channel signals that wireless base station antenna 11-1～11-s sends or report among the channel signal; Extract the channel information that each terminal installation 2-1～2-s sends, and it is outputed to Transmit weight deciding section 5.

Then, summary description is based on the channel information of the down link of being notified, and carries out the action of space segmentation multiplexing transmission to mailing to the transmission signal times that should spatial reuse connects the terminal installation 2-1～2-s of (being assigned with) with the Transmit weight of regulation.

At first; In radio base station apparatus 1; Channel information obtain part 4 from terminal installation 2-1～2-s of should spatial reuse connecting (being assigned with) to control channel signals that wireless base station antenna 11-1～11-s sends or report among the channel signal; Extract the channel information that sends from each terminal installation 2-1～2-s respectively, and they are outputed to Transmit weight deciding section 5.The channel information that extracted this moment is the channel information of the down link from radio base station apparatus 1 to terminal installation 2-1～2-s.

Then; Transmit weight deciding section 5 is for the terminal installation 2-1～2-s that should spatial reuse connects; Generate multiple Transmit weight and generate information through making a plurality of Transmit weight generate part 6-1～6-n, so that carry out only signal transmission according to conditions associated between terminal installation with different separately Transmit weight generating algorithms.Then; Through beam selection part 7; Generate among the ensemble from generate a plurality of Transmit weight that part 6-1～6-n generated by the 1st to n Transmit weight; Selection makes the maximum Transmit weight information of determinating reference of regulation, and this information is outputed to transmitted power deciding section 8 and sends wave beam formation part 9.

Then, transmitted power deciding section 8 is based on the Transmit weight information of being imported, and calculating is used to determine the power partition coefficient for the transmitted power of each spatial reuse stream.

On the other hand; Sending signal generation part 3-1～3-s; Generate respectively and mail to the signal that should spatial reuse connects the terminal installation 2-1～2-s of (being assigned with) (below, be called and send data sequence), these signals are sent out after the signal processing of having been carried out regulation.

Then, in power coefficient multiplier 10-1～10-s, send the signal output that signal generates part 3-1～3-s, multiply by the power partition coefficient of being calculated by transmitted power deciding section 8 for each.

Then; Send wave beam form part 9 for each transmission sequence of data frames signal that multiply by power partition coefficient (with after state); Based on Transmit weight information, generate the symbol data of the base band of the Transmit weight that multiply by (selected) wave beam that is used to form regulation from beam selection part 7.Then, through not shown digital-to-analog converter, frequency band limits filter and frequency converter, be that numerical data is carried out the digital-to-analog conversion to the symbol data of base band, and then carrying out after the frequency band limits that output is transformed to the high-frequency signal of carrier frequency.

Then, wireless base station antenna 11-1～11-s sends to not shown propagation path (space) to the terminal installation 2-1～2-s that should spatial reuse connects with the high-frequency signal of being supplied with.

Here; Among relevant terminal installation 2-1～2-s in radio base station apparatus 1 by the reception processing action of the signal of space segmentation multiplexing transmission; The back is discussed, before it, for the space segmentation multiplexing transmission of the radio base station apparatus in the down link 1; Explaining behind the motion flow that has comprised the viewpoint of dispatching, carry out about the action in each step or the detailed description of determinating reference, weight generating algorithm etc.

Fig. 3 is the flow chart of the space segmentation multiplexing transmission action in the radio base station apparatus 1 of expression down link.Below, the space segmentation multiplexing transmission action in the radio base station apparatus 1 of relevant down link is described with Fig. 1 and Fig. 3.For easy understanding content, after the action summary at first has been described, carry out the explanation of detailed item.

At first, for a plurality of terminal installation 2-1～2-s, the terminal installation 2-k (step S30) below s that decision should preferentially connect with the downlink transmission mode through the packet scheduling of stipulating.Wherein, the terminal installation 2-k that supposes k=1～s (s is a natural number) is by priority allocation.Here; As dispatching method; Have based on the signal of one of the value of the quality of reception of expression terminal installation to noise power ratio (below; Be called SIR (Signal-to-Interference Power Ratio)) Maximum CIR method or the Proportional Fairness method etc. of packet scheduling; For example adopt document A.Jalali et al, " Data Throughput ofCDMA-HDR a High Efficiency-High Data Rate Personal CommunicationWireless System " IEEE VTC2000-Spring, the known technology of institute's information disclosure among the pp.1854-1858.

Then, obtain part 4 by channel information and obtain channel information (step S31) for the down link of the terminal installation 2-1～2-s that is distributed.In this case; In each terminal installation 2-1～2-s; Channel information with observation feeds back under the situation of radio base station apparatus 1 or TDD (Timedivision duplex) in advance; Can utilize the relativity of propagation path, can be based on from the transmission information of the known signal sequence of the up link of each terminal installation 2-1～2-s and obtain the channel information of down link.

Below; Suppose flat decline (influence of decline is all identical in the frequency band of being considered, promptly is uniform ambient condition, and the environment of multipath influence also can not be considered in expression); As the channel information that obtains, will for the channel estimate matrix souvenir of k terminal installation 2-k H (k).The matrix that channel estimate matrix is made up of (reception antenna of k terminal installation 2-k is counted Nr (k)) row, (wireless base station antenna is counted Nt) row, the capable s column element of the j of channel estimate matrix are represented to be replied by the complex channel under the situation of the j reception antenna 20-j of terminal installation 2-k reception from the signal of the s antenna transmission of radio base station apparatus 1.

Then, make the 1st～the n Transmit weight generate part 6-1～6-n and generate a plurality of Transmit weight ensemble (step S32) based on different weight generating algorithms.

Then, among a plurality of Transmit weight information, select to make the determinating reference of regulation to be maximum Transmit weight information (step S33) by beam selection part 7.Here, with the n Transmit weight generate part 6-n to the Transmit weight information of k terminal installation 2-k as Transmit weight Wn (j).Wherein, j=1～Nu (k), Wn (j) is the column vector with Nt element, norm is normalized to 1 (still, except the weight of zero).In addition, Nu (k) is the spatial reuse fluxion for terminal installation 2-k.And k=1～s for the sum of the Nu (k) of all terminal installation 2-1～2-s that should connect simultaneously through the space segmentation multiplexing transmission, when all spatial reuse fluxions are Ns, supposes that it equates with Ns.

Then, based on beam selection part 7 selected Transmit weight information, decision is for the transmit power assignment coefficient of each spatial flow by transmitted power deciding section 8.Have again, in this case, need set, so that the summation of the transmitted power of each stream is no more than the transmission power value of regulation.Then, in power coefficient multiplier 10-1～10-s, send the signal output that signal generates part 3-1～3-s, multiply by power partition coefficient (step S34) by 8 decisions of transmitted power deciding section for each.

Then, forms part 9 based on Transmit weight information, generate for the symbol data of each transmission sequence of data frames signal times with the base band of the Transmit weight gained that is used to form selected wave beam from beam selection part 7 by sending wave beam.Then, with the symbol data of base band be numerical data through not shown digital-to-analog converter, frequency band limits filter and frequency converter, carry out the digital-to-analog conversion, and then carry out after frequency band limits handles, output is the high-frequency signal of carrier frequency by frequency conversion.And, by wireless base station antenna 11-1～11-s the high-frequency signal of being supplied with is sent to not shown propagation path (space) (step S35).

It more than is the summary description of the space segmentation multiplexing transmission action of radio base station apparatus 1 shown in the flow chart of Fig. 3, down link.Below, explain in more detail for following item [1]～[3].

The detailed description of relevant Transmit weight generating algorithm of in Transmit weight generation part 6-1～6-n, being packed into.

The detailed description of the Transmit weight information selection method of relevant beam selection part 7.

The detailed description of the determining method of relevant transmit power assignment coefficient.

The detailed description of relevant Transmit weight generating algorithm of in Transmit weight generation part 6-1～6-n, being packed into

Here, specify relevant Transmit weight generating algorithm of in Transmit weight generation part 6-1～6-n, being packed into.Generate among part 6-1～6-n in Transmit weight, roughly be loaded into the different weight generating algorithm of following three kinds of modes.

Mode (A) is after having added the constraints of alms giver's interference for minimum that makes other-end device 2, and generation improves the algorithm to the Transmit weight of the quality of reception of the terminal installation of stipulating 2.

Mode (B) is additional to make the alms giver of other-end device 2 disturb the constraints of reduction, and generates the algorithm of raising to the Transmit weight of the quality of reception of the terminal installation 2 of regulation.

Mode (C) generates the algorithm of single Transmit weight.

Through using three kinds of such different algorithms, learn through this emulation to generate the conditions associated Transmit weight that to tackle between various terminal installations.Fig. 6～Fig. 8 is in the directive property channel model shown in Fig. 4 A～Fig. 4 E; Use the condition of Fig. 5; Make emission angle difference AOD (2) between terminal installation (with after state) change result curve figure when space correlation coefficient ρ between terminal installation is changed, that relation between space correlation coefficient ρ and the communication quality has been carried out emulation.As the communication quality evaluation of estimate, use and satisfied BER (BER)=1 * 10 ^-3Required transmitted power (wherein, the transmitted power during with an antenna transmission is carried out normalization), the side that this value is little is the good mode of communication quality.

Fig. 4 A is the figure of the antenna element configuration of the wireless base station antenna 60 used in the emulation of expression, and Fig. 4 B is the figure of antenna element configuration of the receiving element antenna 62 of expression terminal installation.In wireless base station antenna 60, the transmitting antenna element 60-1～60-4 of quaternary part is configured in the position that uniformly-spaced separates with distance B t on straight line, and at receiving element antenna 62, the reception antenna element 62-1～62-2 of two elements is separated distance B r and disposes.

Fig. 4 C schematically representes to be reflected at pip 65 because of barrier 64 from the electric wave of above-mentioned wireless base station antenna 60 emissions, the figure of the state that receives through path 67-a and path 67-b and by receiving element antenna 62.The viewpoint definition of normal to expression till the path 67-a of the direction of the electric wave that barrier 64 is launched of barrier 64 sides of the straight line that will arrange from transmitting antenna element 60-1～60-4 is emission angle difference AOD, and the viewpoint definition till the path 67-b of the electric wave direction that will be reflected from the pip 65 of normal to expression from barrier 64 of barrier 64 sides of the straight line that links reception antenna element 62-1～62-2 is incident angle difference AOA.

In addition, the communication path of 62 on the receiving element antenna of wireless base station antenna 60 and k terminal installation (user) is called k user path, AOD and the AOA of this moment is expressed as AOD (k) and AOA (k).K user path comprises path 67-a and path 67-b.

Fig. 4 D is the figure of the beamwidth of representing that schematically the transmission of path 67-a is distolateral, and Fig. 4 E is the figure of the beamwidth of representing that schematically reception among the 67-b of path is distolateral.Transverse axis is represented beamwidth, and the longitudinal axis is represented received-signal strength.The width of point-to-point transmission of 3dB of will having descended from the peak value of received-signal strength is defined as beamwidth, is defined as AS (t) with sending distolateral angle spread (spread), is defined as AS (r) with receiving distolateral angle spread.Under the high situation of wireless base station antenna aspect ratio surrounding building height, AS (r) is arranged than the also big tendency of AS (t).

In Fig. 6, the value during expression Lay this factor K=3dB.In Fig. 6, transverse axis is represented the space correlation coefficient ρ between terminal installation, and the longitudinal axis is represented to have satisfied BER (BER)=1 * 10 as signal quality ^-3Required transmitted power.In addition; The point of square (black) is space correlation coefficient and the point of signal quality between the terminal installation of having described under the situation of occupation mode (A), and the point of triangle (black) is space correlation coefficient and the point of signal quality between the terminal installation of having described under the situation of occupation mode (B).And the point of circular (white) is space correlation coefficient and the point of signal quality between the terminal installation of having described under the situation of occupation mode (C).

In Fig. 6; The value of the space correlation coefficient ρ of the intersection point between mode (B) and the mode (A) is E 1, when the value of the space correlation coefficient ρ of the intersection point between mode (B) and the mode (C) is F1, is the zone of 0～E1 like the value at space correlation coefficient ρ; The communication quality of mode (B) is best; Value at space correlation coefficient ρ is the zone of E1～F1, and the communication quality of mode (A) is best, is the zone of F1～1 in the value of space correlation coefficient ρ; The communication quality of mode (C) is best, and the signal quality of modes changes.And space correlation coefficient shown in Figure 6 and communication quality characteristic have been described.

Situation when Fig. 7 is this factor K of Lay=6dB, the situation when Fig. 8 is this factor K of Lay=9dB.Whichsoever, all the situation with Fig. 6 is identical.That is, even change this factor of Lay, space correlation coefficient and communication quality characteristic also can be divided into a plurality of subregions more than three, in each subregion, have the best mode of communication quality.

Here, this factor K of Lay is the parameter of the observed case between expression wireless base station antenna 60 and the receiving element antenna 62.Usually; When this factor K of Lay is big; Imagine its for the wireless base station antenna height higher, the propagation model of the honeycomb of openr environment (cellular) environment, this factor K of Lay than hour; If imagine its for wireless base station antenna 60 and receiving element antenna 62 all than around the height of building low, be not the propagation model that is under the situation of open environment.

Can know from these results; During relevant low between terminal installation (for example space correlation coefficient ρ is more than 0 and during 0.3 following scope), it is favourable being used to improve the degree of freedom of a plurality of antennas of transmitter side to the mode on the communication quality of terminal installation 2 (B).And in (for example space correlation coefficient ρ is more than 0.8 and during 1 following scope) under the relevant very high situation, the mode (C) of not carrying out the space segmentation multiplexing transmission is favourable.In (for example space correlation coefficient ρ is more than 0.4 and during 0.6 following scope) under their the relevant situation of intermediateness, the mode (A) that the degree of freedom of a plurality of antennas of transmitter side is used to remove the phase mutual interference of terminal room is favourable.That is, according to space correlation coefficient ρ, when selecting above-mentioned three modes; At space correlation coefficient ρ is the zone of 0≤ρ≤0.3, selects second mode (mode B), is the zone of 0.4≤ρ≤0.6 at space correlation coefficient ρ; Select first mode (mode A); At space correlation coefficient ρ is the zone of 0.8≤ρ≤1, selects Third Way (mode C), through suitably select algorithm of different nature effectively according to space correlation coefficient; Thereby can keep high communication quality, make it can carry out the space segmentation multiplexing transmission.

Here; The algorithm of mode (A) type comprises: (A-1) for zero wave beam (null beam) method of other-end device 2 trend zero (ZF wave beam (Zero-Forcing, compel zero, wave beam) MMSE wave beam (Minimum-Mean-Square-Error, least mean-square error, wave beam), perhaps when terminal installation 2 has a plurality of antenna; (A-2) piece orthogonalization weight method and (A-3) after the reception weight when receiving through hypothesis receives so that high specific is synthetic is carried out wherein one or more methods of the combination Weight generation method of piece quadrature.

In addition; The algorithm of mode (B) type comprises: (B-1) characteristic vector beam forming method (for the singular value that will carry out the singular value decomposition gained to the channel estimate matrix H (k) of specific k terminal installation 2-k, using and the corresponding right singular vector of singular value to the size of the spatial reuse fractional part Nu (k) of specific k terminal installation 2-k), (B-2) select wherein one or more methods of method of wave beam of the direction of the most approaching specific terminal installation 2 that carries out the space segmentation multiplexing transmission of its main beam direction from the different a plurality of fixed beam patterns (beam pattern that orthogonal beams pattern or main beam direction are uniformly-spaced different etc.) of main beam direction property.

The algorithm of mode (C) type is included in a plurality of terminal installation 2-1～2-s, only a prepreerence terminal installation 2 is sent the characteristic vector wave beams, to other-end device 2, generates whole elements and be the single Transmit weight method of zero weight of zero.

Below, each Weight generation method of the algorithm of relevant mode (A) type is explained in more detail.

(A-1) to the situation of the zero beam forming method of other-end device 2 trend zero:

When forming the ZF wave beam, the following Transmit weight Wk (j) that calculates for k terminal installation 2-k.That is, except the channel estimate matrix H (k) of k terminal installation 2-k,, calculate the Transmit weight Wk (j) that satisfies with the condition of (formula 1) expression for all channel estimate matrix H (l) of the other-end device 2 that should connect simultaneously.Wherein, j=1～Nu (k), Nu (k) are that s is whole terminal installation numbers of institute's spatial reuse for the fluxion of the spatial reuse stream of terminal installation 2-k.

[formula 1]

H(l)Wk(j)＝0

Wherein, for example, the fluxion that flows at the spatial reuse for terminal installation 2-1 is Nu (l)=3 o'clock, for constituting three elements, the W1 (1)～W1 (3) of conduct for the column vector W1 (j) of the Transmit weight of terminal installation 2-1, calculates the value that satisfies (formula 1).

As above, make k change to s from 1, thereby calculate Transmit weight for all terminal installation 2-1～2-s.That is, use the total mode, calculate Ns part Transmit weight as total fluxion of whole spatial reuse streams.

When forming the MMSE wave beam, suppose the noise power δ in all receiver side terminal installations 2 ²Values for all equating are set at a certain setting with it, generate to be used for satisfying so that the Transmit weight Wn (j) of the condition that the signal of each terminal installation 2 and disturbing wave power ratio (SIR) are represented for maximum (formula 2), (formula 3).Wherein, j=1～s, s are whole terminal installation numbers of institute's spatial reuse.

[formula 2]

$F={(Q^{H}Q+\frac{{\mathrm{\σ}}^2}{\mathrm{Nt}}I)}^{-1}{Q}^H=\left[\begin{array}{cccc}{W}_n\left(1\right)& W_n\left(2\right)& \·\·\·& W_n\left(s\right)\end{array}\right]$

Wherein,

[formula 3]

$Q=\left[\begin{array}{c}H\left(1\right)\\ H\left(2\right)\\ \·\\ \·\\ \·\\ H\left(s\right)\end{array}\right]$

Subscript ' H ' expression complex conjugate operator.

(A-2) situation of piece orthogonalization weight method:

The following Transmit weight Wn (j) that calculates for k terminal installation 2-k.Wherein, j=1～Nu (k).At first, except the channel estimate matrix H (k) of k terminal installation 2-k, based on the channel estimate matrix H (l) of the other-end device that should connect simultaneously (wherein, l=1,2 ..., s, l ≠ k) generates the matrix D k as new matrix (formula 4) expression.

[formula 4]

$D_k=\left[\begin{array}{c}H\left(1\right)\\ \·\\ \·\\ \·\\ H(k-1)\\ H(k+1)\\ \·\\ \·\\ \·\\ H\left(s\right)\end{array}\right]$

Then, ask Dk is carried out the right singular matrix Vk shown in (formula 5) of singular value decomposition gained.

[formula 5]

$D_k=U_k{B}_k{V}_k^H$

The right singular matrix Vk of gained constitutes the matrix of the capable Nt row of Nt, but the matrix that will take out the right singular vector gained corresponding with singular value " 0 " (numerical value is zero) wherein is made as Rk.Matrix Rk is made up of the capable Nq row of Nt.Wherein, Nq representes with (formula 6).

[formula 6]

$N_q=N_t-\underset{j\≠k}{\overset{s}{\underset{j=1}{\mathrm{\Σ}}}}{N}_r\left(j\right)$

The matrix Rk that uses the capable Nq row of this Nt to form based on the new matrix Ek of (formula 7) expression, carries out the characteristic vector wave beam and sends.

[formula 7]

E _k＝H(k)R _k

Promptly; Matrix Ek is made up of Nr (k) row Nq row; Ek is being carried out in the right singular vector of singular value decomposition gained; With the fluxion of the spatial reuse stream that sends to k terminal installation 2-k is the individual singular value of Nu (k) by from big to small selective sequential, and will the right singular vector corresponding with selected singular value, as Transmit weight Wn (j).

As stated, make k change to s from 1, calculate Transmit weight for terminal installation 2-1～2-s.That is, with the total mode, total fluxion of calculating all spatial reuse streams is Ns a Transmit weight.

(A-3) after the reception weight when having supposed to receive receives with the high specific synthetic weight, carry out the situation of the orthogonalized combination Weight generation method of piece:

The following Transmit weight Wn (j) that calculates for k terminal installation 2-k.Wherein, j=1～Nu (k).At first; Shown in (formula 8); Carry out among the left singular matrix Uk of singular value decomposition gained at channel estimate matrix H (k) k terminal installation 2-k; With the fluxion of the spatial reuse stream that sends to k terminal installation 2-k is that the individual singular value of Nu (k) is pressed selective sequential from big to small, and the use left singular vector corresponding with selected singular value, is assumed to be the reception weight matrix Gk among the k terminal installation 2-k.Receiving weight matrix Gk is made up of Nr (k) row Nu (k) row.

[formula 8]

$H\left(k\right)=U_k{B}_k{V}_k^H$

Whole terminal installation 2 is calculated this matrix.

Then; Use with the channel estimate matrix H (m) about the channel estimate matrix H (k) of k terminal installation 2-k, after receiving except the weight matrix G (k) and reception weight matrix Gm (wherein; M=1～s, m ≠ k), calculate new channel estimate matrix Dk with (formula 9) expression.

[formula 9]

$D_k=\left[\begin{array}{c}{E}_{1}H\left(1\right)\\ \·\\ \·\\ \·\\ E_{k-1}H(k-1)\\ E_{k+1}H(k+1)\\ \·\\ \·\\ \·\\ E_{s}H\left(s\right)\end{array}\right]=\left[\begin{array}{c}{G}_1^{H}H\left(1\right)\\ \·\\ \·\\ \·\\ G_{k-1}^{H}H(k-1)\\ G_{k+1}^{H}H(k+1)\\ \·\\ \·\\ \·\\ G_s^{H}H\left(s\right)\end{array}\right]$

Then, to the matrix D k of gained, ask with (formula 5) expression right singular matrix Vk.The right singular matrix Vk of gained constitutes the matrix of the capable Nt row of Nt, but the matrix of right singular vector taking-up gained that will be corresponding with singular value " 0 " (numerical value is zero) wherein is made as Rk.Matrix Rk is made up of the capable Nv row of Nt.Wherein, Nv representes with (formula 10).

[formula 10]

$N_v=N_t-\underset{j\≠k}{\overset{s}{\underset{j=1}{\mathrm{\Σ}}}}{N}_u\left(j\right)$

The matrix Rk that use is made up of the capable Nv row of this Nt based on the new matrix Ek with (formula 7) expression, carries out the characteristic vector wave beam and sends.Promptly; Matrix Ek is made up of Nr (k) row Nv row; Ek is being carried out in the right singular vector of singular value decomposition gained; With the fluxion of the spatial reuse stream that sends to k terminal installation 2-k is that the individual singular value of Nu (k) is pressed selective sequential from big to small, and the use right singular vector corresponding with selected singular value, as Transmit weight Wn (j).

As stated, make k change to s from 1, thereby calculate Transmit weight for terminal installation 2-1～2-s.That is, with the total mode, total fluxion of calculating all spatial reuse streams is Ns a Transmit weight.

Have again; Reception weight when this method (A-3) is supposed to receive receives with the synthetic weight that receives of high specific; So forming the restriction condition of directive property zero just obtains relaxing; For the method for (A-2), even the total of the reception antenna number that is possessed in the terminal installation that connects simultaneously 2 situation bigger than the number of transmit antennas Nt of radio base station apparatus 1 also can be suitable for.In addition, in the method for (A-2), the reception antenna number is the restriction condition under the situation that forms Transmit weight; On the other hand; In the method, because the spatial reuse fluxion is for the restriction condition under the situation that forms Transmit weight, so in certain terminal installation 2-k; Spatial reuse fluxion Nu (k) to terminal installation 2-k counted Nr (k) hour than reception antenna, had the characteristic that can obtain the quality of reception better than the method for (A-2).

The detailed description of the Transmit weight information selection method in the relevant beam selection part 7

Here, carry out the detailed description of the Transmit weight information selection method in the relevant beam selection part 7.Beam selection part 7 generates a plurality of Transmit weight ensemble that part 6-1～6-n generated from the Transmit weight of the 1st～the n, selects to make the maximized Transmit weight information of determinating reference of regulation.As determinating reference, use signal that terminal installation 2 received to noise power ratio (below be called SNR) or signal predicted value to the physical quantity of expression signal quality such as disturbing wave noise power ratio (below be called SINR).

Therefore, use formula, the system of selection of concrete Transmit weight is described.At first, Ns spatial flow when supposing moment t is (formula 11), and the Transmit weight information that n Transmit weight generation part 6-n is generated is selected, and the signal Yn (t) that should send representes with (formula 12).Wherein, k=1～Ns, the column vector that Yn (t) expression is made up of Nt element.In addition, (formula 13) expression, supposes that constant power sends here for the transmitted power separately of all spatial reuse streams of terminal installation 2-1～2-s.And Wn (k) is the Transmit weight (column vector of Nt element) that generates the k spatial flow (formula 11) that part 6-n generated for the n Transmit weight.

[formula 11]

S _k(t)

Wherein, subscript ' k ' refers to the k spatial flow, and k=1,2 ..., Ns.

[formula 12]

[formula 13]

P _k

Wherein, subscript ' k ' is meant the k spatial flow, and k=1,2 ..., Ns.

Then, the reception signal (formula 14) in the prediction terminal installation 2.Receive signal (formula 14) and can use channel information H (k), shown in (formula 15) k terminal installation 2-k.

[formula 14]

Z _k(t)

[formula 15]

Z _k(t)＝H(k)Y _n(t)

Wherein, be 1 o'clock at the antenna number Nr of terminal installation 2-k (k), SINR can obtain according to (formula 16).Have, δ is the noise power of hypothesis when having added the additive noise of Gauss's property, as the fixed value of regulation, carries out following processing again.

[formula 16]

${\mathrm{SINR}}_n\left(k\right)=\frac{{\left|H\left(k\right)W_n\left(k\right)\right|}^2}{\underset{j=1,j\≠k}{\overset{\mathrm{Ns}}{\mathrm{\Σ}}}{\left|H\left(k\right)W_n\left(j\right)\right|}^2+{\mathrm{\σ}}^2}$

In addition,, suppose to form directive property, thereby carry out the SINR evaluation when being a plurality of in the antenna number of terminal installation 2-k with (formula 17) by receiving weight R (k).Here, receive the column vector that reception antenna that weight R (k) expression has terminal installation 2-k is counted the individual element of Nr (k).In (formula 17), subscript

' n ' expression is to user terminal, promptly carry out each terminal installation 2 that spatial reuse connects number when having added label successively, in the present embodiment, and corresponding to terminal installation 2-1～2-s.

[formula 17]

${\mathrm{SINR}}_n\left(k\right)=\frac{\left|R\left(k\right)H\left(k\right)W_n\left(k\right)\right|}{\underset{j=1,j\≠k}{\overset{N_s}{\mathrm{\Σ}}}{\left|R\left(k\right)H\left(k\right)W_n\left(j\right)\right|}^2+{\mathrm{\σ}}^2{\left|\right|R\left(k\right)\left|\right|}^2}$

Method as the reception weight of the hypothesis in the computing terminal device 2 when having the disturbing wave component, can adopt MMSE method, ZF method, even do not considering under the also passable situation of disturbing wave component, can adopt the synthetic weight that receives of high specific.

In addition; Calculate the method for Transmit weight; Under the situation of piece orthogonalization weight method; Also can channel estimate matrix H (k) carried out in the singular value of singular value decomposition gained, will use the left singular vector corresponding for the singular value of the stream fractional part of the spatial reuse of terminal installation 2-k stream with from big to small selective sequential with selected singular value.

In addition, also can use through having a plurality ofly as above-mentioned reception weight and the candidate of available weight information, the SINR that carries out separately estimates, thus the method for the best of breed of selective reception weight and Transmit weight candidate.In this case, the treating capacity that is used for the SINR evaluation increases to some extent, but can obtain best communication quality in various communication environments conditions.

The Wn (k) of calculating (formula 17) expression that will be through above argumentation calculates each user's SINRn (k) as variable.Generate part by the 1st～the n Transmit weight and calculate them.Then, select these each users of self-generating SINRn (k) summation for the s Transmit weight of maximum Transmit weight generate part 6-s output information, be Transmit weight Ws (k).Wherein, k=1～Ns.

Have again,, also can carry out the corresponding weight add operation of QoS (delay allowance or transmission requests speed etc.) here with the spatial reuse stream that carries out spatial reuse.For example, be transmitted as essential user (terminal installation), increase weight, preferentially carry out the signal transmission for the less real-time signal of delay allowance.Thus, realize reducing the number of times of retransmission process, improve as overall throughput of system.

In addition, also can carry out the weight add operation corresponding with transmission requests speed.For example, for the higher spatial reuse stream of transmission requests speed, through increasing weight, the spatial reuse stream that request rate is higher preferentially carries out the signal transmission, thereby realizes the raising as overall throughput of system.

The detailed description of the determining method of relevant transmit power assignment coefficient

Here, specify the determining method of relevant transmit power assignment coefficient.Power division in simple terms, also can be that constant power distributes, but through adopting the method for following (1)～(2), can realize the raising of throughput or the reduction of transmitted power.

(1) method of raising capacity (throughput):

For reception quality of broadcast signals, measure SNR (k) as terminal installation 2-k, and this metrical information is prenoticed to radio base station apparatus 1 from radio base station apparatus 1.Employing is from each SNR (k) and channel estimate matrix, the Water-filling method that is the basis with the capacity of theory (method that the good stream of SNR value is preferentially distributed power).Thus because the power division ratio of each spatial flow determined, so with this ratio as power partition coefficient.

Have again, in this case, for the variation of order of modulation and encoding rate (below, be called MCS),, more expect to carry out the correction of power division ratio usually owing to be the value of discreteness.In this case, various bearing calibrations below the use.Promptly; The reception SINR of the terminal installation 2-k of prediction under the situation of the power division of having carried out being calculated; When the SINR that dopes has surpassed the required SINR among the MCS that realizes maximum rate; The part that will surpass, required and be that enough power division offer terminal installation 2-k, so give spatial flow for other-end device 2 with the power division of its remainder.On the contrary, during required SINR in being lower than the MCS that realizes minimum-rate,, just reduce power division ratio for the spatial flow of other-end device 2 owing to preferentially carry out power division for the spatial flow of terminal installation 2-k.

(2) method of reduction transmitted power:

At first, for reception quality of broadcast signals, measure SNR (k) as terminal installation 2-k, and this metrical information is prenoticed to radio base station apparatus 1 from radio base station apparatus 1.From resulting SNR (k), noise power is estimated, the SNR when sending as spatial reuse stream, prediction is by the SNRt (j) of (formula 18) definition.Wherein, j=1～Nu (k), and the ratio of the maximum power of the regulation of the transmitted power that Pa representes broadcast singal when sending spatial reuse stream.And, when h (k) has been illustrated in from the n antenna transmission broadcast singal, the column vector that the element of antenna number Nr (k) same number that the n of H (k) row are formed, that possess with the receiving element of terminal installation 2-k is formed.

[formula 18]

${\mathrm{SNR}}_t\left(k\right)=\frac{{\left|H\left(k\right)W_n\left(k\right)\right|}^2}{P_a{h}^H\left(k\right)h\left(k\right)}$

Then, in radio base station apparatus 1,, carry out following processing as the quality of reception (SNR) and the correspondence table between the best MCS that have in advance in the terminal installation 2.At first, according to from all terminal installations that should connect simultaneously 2 about the delay allowance separately that QoS asked, from the high sequence number of the priority of transfer of data, carry out power division to terminal installation.Then, from the combination of the MCS of the transmission rate that realizes having satisfied delay allowance, the required SNR of minimal transmission rate is satisfied in decision after the surplus of having added regulation.

Then, decision power partition coefficient b (j) is so that the spatial reuse stream SNR SNRt (j) when sending and required SNR are about equally.Compared 1 hour at b (j); For other spatial flow or the other-end device 2 that connects simultaneously; In being no more than the scope of remaining transmitted power, likewise carry out power division, the terminal installation 2 for the required SNR of unmet in the terminal installation that should connect simultaneously 2 does not send.Then, distribute, so that the summation of power partition coefficient b (k) finally is below 1.

Then, specify the relevant signal that sends and generate the action among part 3-1～3-s.At first, send signal at the 1st～the s and generate part 3-1～3-s, generate respectively to mail to and carry out the signal (below, be called and send data sequence) that spatial reuse connects the terminal installation 2-1～2-s of (by priority allocation).Then; Send data sequence for each; Use not shown error correcting encoder, interleaver, perforator and modulator, carry out error correction coding, after having carried out perforation, interweaving; Carry out symbol mapped (below, the signal that will carry out symbol mapped (symbol mapping) is called symbol data sequence or spatial flow individual data signal) through the modulation system of regulation.Then, to each symbol data sequence, generate known in advance pilot signal and subsidiary control information and transmission signal with frame structures specified.Below, this signal is called the transmission sequence of data frames.

Fig. 9 B is an example of sending the sequence of data frames structure.3-1～3-s generates, each transmission sequence of data frames 500-1～500-s of output is made up of control information portion C 1～Cs and spatial flow Partial K 1～Ks to send signal generation part from the 1st～the s, and each spatial flow Partial K 1～Ks is made up of spatial flow indivedual pilot signal part P1～Ps and spatial flow individual data signal section D1～Ds.

Control information portion C 1～Cs is to the signal of all terminal installation 2-1 that should carry out the spatial reuse connection～2-s broadcasting, is sent by non-directive.In control information portion C 1～Cs, comprise: follow-up space fluxion; For the id information of the terminal installation of the transmission destination of spatial flow number, i.e. expression is the information that mails to the spatial flow that the transmission data sequence of which terminal installation comprised; And the modulation format information of coding method, encoding rate, order of modulation, data length etc.

On the other hand, spatial flow Partial K 1～Ks is to use Transmit weight to the signal that each terminal installation 2-1～2-s is transmitted, and is sent by directive property.In spatial flow Partial K 1～Ks; The indivedual pilot signal part of spatial flow P1～Ps that known in advance pilot signal sequence is formed is employed in incidental preamble structure in the leading portion of the spatial flow individual data signal section that the transmission data (individual data) that mail to each terminal installation are comprised; But also can be incidental postamble structure in the rear end, also can be incidental midamble structure in the centre of spatial flow individual data signal section.

Fig. 9 A be on time shaft and spatial axes, schematically represent above-mentioned transmission sequence of data frames for a plurality of terminal installation 2-1～2-s (being equivalent to the 1st user～s user) by the figure of the state of space segmentation multiplexing transmission.For carrying out all users (the 1st user～s user) that spatial reuse connects, after being illustrated in same control information 40-1～40-s and being sent, sent by directive property respectively for each user's (the 1st user～s user) signal by non-directive.Time till T1 to T2 is equivalent to send a transmission required time of sequence of data frames.

Figure 10 B is an example of the 2nd transmission sequence of data frames structure.Be in the spatial flow part, also to comprise the indivedual control information part of spatial flow SC1～SCs with the frame structure different portions of Fig. 9 B.In the indivedual control information part of spatial flow SC1～SCs, comprised modulation format (modulation format) information of follow-up spatial flow individual data signal section D1～Ds, by modulation format transmission with fixing regulation.

Through using this structure, in control information portion C 1～Cs, owing to need not comprise the modulation format information of follow-up spatial flow individual data signal section D1～Ds, so can reduce the transmission quantity among control information portion C 1～Cs.And; The indivedual control information part of the spatial flow SC1～SCs that has comprised the modulation format information of spatial flow individual data signal section D1～Ds is also sent by directive property; So in terminal installation 2-1～2-s, can prevent the reception mistake of the modulation format information of spatial flow individual data signal section D1～Ds.Its result can guarantee the higher quality of reception.

It more than is the detailed description of relevant issues [1]～[3].

Below, move with Fig. 2 A, the relevant processing of Fig. 2 B explanation for the reception among the terminal installation 2-1～2-s of the signal of institute's space segmentation multiplexing transmission in radio base station apparatus 1.Have again, following, explain with radio base station apparatus 1 synchronous (frame, symbol synchronization) establishment after action.

At first, in terminal installation 2-A, the high-frequency signal by receiving element antenna 20-1～20-m is received is input to receiving unit 221-1～221-m respectively.Receiving unit 221-1～221-m carries out the filtering of predetermined band from high-frequency signal; With its frequency conversion is the baseband signal that orthogonal detection is crossed; And through the digital-to-analog conversion (below; Be called the A/D converter) and digital signal data that output is made up of I signal, Q signal (below, be called complex base band signal).

Spatial reuse separating part 223 is from one or more complex base band signal of being imported; Reception is to the data-signal of the spatial flow number of the regulation that mails to this terminal installation and notify; And carry out the action of following that kind; So that remove the data-signal that mails to the spatial flow number beyond this terminal, be the disturbing wave signal, or it is suppressed to the degree that can guarantee to be enough to communicate required signal quality.

At first, in channel estimating part 222, the arrival that in each spatial flow, attaches the pilot signal of sending (below, be called the indivedual pilot signals of spatial flow) regularly, indivedual pilot signals of all spatial flows of separation and Extraction, and calculate the channel estimation value of propagation path.Here, suppose that the m terminal installation 2-m that receives the signal that has carried out the space segmentation multiplexing transmission comprises Nr (m) individual receiving element antenna 20-1～20-m and Nr (m) the individual receiving unit 221-1～221-m corresponding with each receiving element antenna.

Related operation between (formula 19) of the i.e. inside generation of (formula 20) and terminal installation 2-m of the output signal through the gained as a result that carries out receiving by j receiving element antenna 20-j among the m terminal installation 2-m and receiving unit 221-j; The indivedual pilot signal sequences of k spatial flow (formula 19) are expressed as (formula 21) that kind, calculate the channel estimation value (formula 22) of propagation path.

[formula 19]

AP _k(t)

[formula 20]

r _j，k ^(m)(t)

Wherein, j=1 ..., Nr (m).In addition, k=1 ..., Ns.And Nr (m) is the receiving element antenna number.

[formula 21]

$h^m(j,k)=\underset{j=1}{\overset{\mathrm{Np}}{\mathrm{\Σ}}}A{P}_k^{*}\left(t\right)r_{j,k}^{\left(m\right)}\left(t\right)$

Have, Np is the code element number of the indivedual pilot signal sequences of spatial flow again.Last target ' * ' is the operator of carrying out complex conjugate.

[formula 22]

h ^m(j，k)

Have again, also can the reception result through the indivedual pilot signal sequences of spatial flow repeatedly (formula 19) be preserved, and carry out equalization and handle; In this case; If the translational speed of terminal installation 2-m is very little, then can reduce The noise, improve the channel estimating quality of propagation path.

As the channel estimation value of the propagation path of m terminal installation 2-m, the final channel estimation value (formula 22) that adds up to the individual propagation path of Ns * Nr (m) that calculates.Wherein, Ns is the spatial reuse fluxion, and Nr (m) is the receiving element antenna number of terminal installation 2-m.

Here, will as (formula 24), define for the channel estimate matrix (formula 23) of terminal installation 2-m.

[formula 23]

H ^m

[formula 24]

$H^m=\left[\begin{array}{cccc}{h}^m\left(\mathrm{1,1}\right)& h^m\left(\mathrm{1,2}\right)& \·\·\·& h^m(1,N_t)\\ h^m\left(\mathrm{2,1}\right)& h^m\left(\mathrm{2,2}\right)& \·\·\·& h^m(2,N_t)\\ \·& \·& \·& \·\\ \·& \·& \·& \·\\ \·& \·& \·& \·\\ h^m(N_s^{\left(m\right)},1)& h^m(N_s^{\left(m\right)},2)& \·\·\·& h^m(N_s^{\left(m\right)},N_t)\end{array}\right]$

Then, use resulting channel estimate matrix (formula 23), carry out the separation of spatial reuse channel.Here, the separation of so-called spatial reuse channel refers to and from spatial reuse stream, separates, extracts the identical action of data-signal that is comprised in each spatial flow.

As separation method, the situation of promptly using ZF (Zero Forcing) as the method for utilizing the inverse matrix of channel estimate matrix is described, and the situation of using MMSE (Minimum Mean Square Error).

At first, the situation of using the ZF method is described.In the ZF method,, under the situation of using the ZF method, calculate H for the reception signal (formula 25) of j receiving element antenna 20-j among the m terminal installation 2-m and receiving unit 221-j ^mThe i.e. (H of inverse matrix ^m) ^-1In the vectorial V of row (Bm) that forms of (Bm) row, and with its reception weight as the spatial reuse stream that receives regulation.

[formula 25]

r _j ^(m)(t)

Wherein, j=1 ..., Nr (m), Nr (m) is the receiving element antenna number.

Here, Bm is the spatial flow number of being notified from radio base station apparatus 1 that mails to terminal installation 2-m.The data-signal of Bm spatial flow number is such shown in (formula 26); Can multiply each other through the spatial flow reception signal (formula 27) that will receive among weight V (Bm) and the terminal installation 2-m, can be used as the expectation ripple signal extraction that has suppressed from the disturbing wave signal of other spatial flows.

[formula 26]

$z_{B_m}^m\left(t\right)=V\left(B_m\right)r^m\left(t\right)$

[formula 27]

r ^(m)(t)

Wherein, r ^(m)(t) be with j antenna among the m terminal installation 2-m and the received r of receiving unit 221-j _j ^(m)(t) (wherein, j=1 ..., Nr (m)) as the column vector of j element.

The situation of the relevant MMSE of use method then, is described.In this case, same with the ZF method, also calculate the vectorial V of row (Bm) of the capable composition of Bm of the reception weight matrix W that is calculated by the MMSE standard, and with its reception weight as the spatial flow that receives regulation.

The Bm spatial flow is such shown in (formula 26), can multiply each other through the spatial flow reception signal (formula 27) that will receive among weight and the terminal installation 2-m, can be used as the expectation ripple signal reception that has suppressed from the interference signal component of other spatial flows.

Have again; Exist when a plurality of at the spatial flow number that mails to same terminal installation 2-m; Be used to receive the reception weight of the data-signal of each spatial flow number through generation, and receive signal (formula 27) with spatial flow and multiply each other, expect the ripple signal thereby can from spatial flow, separate equally to receive.

Have again; Under the situation of the ten-four of the coding method of the relevant encoding rate that mails to the spatial flow data beyond this terminal installation 2-m, order of modulation etc., modulator approach, can adopt maximum likelihood to estimate (combining to estimate), Interference Cancellation methods such as (V-BLAST etc.) one by one.

Demodulation part 224 is the transmission data sequence of regulation through to carrying out demodulation and decoding processing from the spatial reuse flow point from the expectation ripple signal that receives thereby restore.

Have again; Shown in Fig. 2 B,, can't not carry out spatial interference eliminated owing to there is spatial reuse separating part 223 at the terminal installation 2-B that only has single receiving element antenna 20-1; So in demodulation part 224; The channel estimation value that use is obtained by channel estimating part 222 from the signal that receiving unit 221-1 is received, compensation is carried out demodulation process simultaneously because of the influence that the environmental condition change of propagation path causes.

Through above action; In embodiment of the present invention 1; Can be according to various space correlation situation; Selection is for the space segmentation multiplexing transmission of a plurality of terminal installation 2-1～2-s, and the Transmit weight of the quality of reception can select to improve a plurality of antennas among terminal installation 2-1～2-s and receive the time.As its result, but the improvement of implementation space division multiplexing system for transmitting capacity.

And; In the distribution operation of the preferential connecting terminal device 2 that should spatial reuse connects; Do not need in the past undertaken by radio base station apparatus, distribute control based on the combination of the terminal installation 2 of the detection of space correlation coefficient, can be only distribute operation with user's allocation process of the priority of common packet scheduling.Its result can realize the simplification of handling for the scheduling of the terminal installation 2 that should spatial reuse connects.

In addition; When terminal installation 2 possesses a plurality of receiving elements (unit) antenna as terminal installation 2-A; Through in radio base station apparatus 1, each spatial flow being attached the known pilot signal of transmission; In the receiving element 220 of terminal installation 2, adopted the channel estimating of these pilot signals, thereby in radio base station apparatus 1, when generating Transmit weight; Even in the environmental change that has produced channel estimation errors or propagation path is under the timeliness of the channel situation about changing, also can reduce the deterioration of the communication quality that these influences cause.

In addition, under the situation of TDD system, can utilize the character of " relativity of propagation path ", the channel estimation results in the up link is used as the channel estimation value in the down link.In this case, deviation between system needs to be proofreaied and correct fully in advance, and the deviation between system has comprised the deviation of the sending/receiving system in the up link with transmission/reception antennas in the sending/receiving system in the down link and the generation of high frequency (RF) circuit.But, in general, can not proofread and correct fully and to comprise the situation of the error between system more.Therefore, through adopting this method,, also can reduce the deterioration of the communication quality that the influence of this error causes even comprised in the situation of the error between system in above-mentioned that kind.

Have again; In embodiment of the present invention 1, generate part 6-1～6-n generation Transmit weight by Transmit weight after, in beam selection part 7; SINR selects Transmit weight based on prediction; But the also space correlation coefficient between the computing terminal device in advance, based on its mean value or minimum value, the decision Transmit weight.

In this case; For the Transmit weight generation method of selecting quickly than previous methods to adapt to the space correlation situation of terminal room; Utilize particularly roughly the space correlation coefficient of the Transmit weight generating mode of three types to relation specific on the communication quality characteristic; And this specific character is divided into a plurality of zones, in each zone, automatically selecting communication quality is best mode.

That is, comprise: in the reception signal of self terminal device always, extract the channel information between terminal installation and the radio base station apparatus, ask the space correlation coefficient step between should the terminal installation of space segmentation multiplexing transmission based on this channel information through constituting; In the relation of the Transmit weight generating mode of three types; In each zone; Be predetermined that to be used to select communication quality be the processing method of best mode; Based on this selection processing method and the space correlation coefficient obtained through the step of asking space correlation coefficient, selecting communication quality is the step of best mode, can select Transmit weight simply.

Have, embodiment of the present invention 1 can not distinguished single carrier transmission, the realization of multi-carrier transmission ground again.When multi-carrier transmission, through to each subcarrier calculating channel estimated value, and to each subcarrier as the action in this execution mode, the separation of carrying out spatial reuse stream receives and can realize.In addition, no matter duplex (duplex) mode of so-called TDD, FDD also can be suitable for.In addition, no matter access (access) mode of so-called TDMA, FDMA, CDMA is also applicable.

As above; According to embodiment of the present invention 1; Based on channel information to a plurality of terminal installation 2-1～2-s that should the space segmentation multiplexing transmission; Be used to generate the structure of Transmit weight deciding section 5 of method of a plurality of terminal installation 2-1～2-s being carried out the Transmit weight of space segmentation multiplexing transmission through having to change, can obtain under various space correlation situation, to improve and guarantee communication quality and improve the effect of the power system capacity of space segmentation multiplexing transmission along with this situation.

In addition, can change the Transmit weight method of generationing that adapts to the space correlation of terminal room, can carry out sending simplification allocation process in the past for the sane spatial reuse of the space correlation situation of terminal room based on space correlation coefficient.The effect that thus, can obtain to simplify radio base station apparatus 1 and shorten the processing time that is used for the control of space segmentation multiplexing transmission.

In addition; If radio base station apparatus 1 has: a plurality of Transmit weight information generate part 6-1～6-n; Based on channel information, be created on employed Transmit weight information in the forming of the transmission wave beam that sends to a plurality of terminal installation 2-1～2-s by different algorithms for a plurality of terminal installation 2-1～2-s that should the space segmentation multiplexing transmission; Beam selection part 7 in by a plurality of Transmit weight information that different algorithms generated, is selected any one Transmit weight information; And the transmission wave beam forms part 9; Selected Transmit weight information is used as Transmit weight; Form and send wave beam; And constitute and have the function of carrying out the space segmentation multiplexing transmission, then can under various space correlation situation, improve and guarantee communication quality and improve the power system capacity of space segmentation multiplexing transmission along with this situation.

In addition, can select and the suitable Transmit weight generation method of the space correlation situation of terminal room, can carry out sending, simplify allocation process in the past based on space correlation coefficient for the sane spatial reuse of the space correlation situation of terminal room.The effect that thus, can obtain to simplify radio base station apparatus 1 and shorten the processing time that is used for the control of space segmentation multiplexing transmission.

In addition; If constituting, transmitted power deciding section 8 has based on selected Transmit weight information; Decision is for the function of the transmitted power of the spatial reuse signal of a plurality of terminal installation 2-1～2-s; Then when the spatial reuse for a plurality of terminal installation 2-1～2-s sends; Can from a plurality of different Transmit weight generating algorithms, select only algorithm and generate and the Transmit weight that adapts through various space correlation situation that channel information detected, and the control signal power of sending with these Transmit weight.Thus, can send, not use required above transmitted power to send,, improve the effect of power system capacity so can obtain to reduce same channel disturbance with the signal power that satisfies the communication quality of stipulating.

In addition; If beam selection part 7 constitutes based on the information of the signal in the expression terminal installation 2 with the interference noise power ratio; Selection should be as the function of the Transmit weight information of Transmit weight, then can obtain under various space correlation situation, to improve and guarantees communication quality and improve the effect of the power system capacity of space segmentation multiplexing transmission along with this situation.

In addition; If beam selection part 7 constitutes when terminal installation 2 can receive with a plurality of receiving element antenna 20-1～20-m; Reception weight in the terminal installation 2 carried out the prediction that forecasting institute gets and receive on the basis of weight using; Have the function of selecting Transmit weight, then can obtain under various space correlation situation, to improve and guarantee communication quality and improve the effect of the power system capacity of space segmentation multiplexing transmission along with this situation.

In addition, if make prediction receive weight, then can obtain under various space correlation situation, to improve and guarantee communication quality and improve the effect of the power system capacity of space segmentation multiplexing transmission along with this situation for forming the weight structure of the synthetic received beam of high specific.

In addition; If make prediction receive weight for channel estimate matrix being carried out the structure of the left singular vector of singular value decomposition gained; Then can decision make the maximum Transmit weight of received power on the basis of same channel disturbance suppressing, can obtain under various space correlation situation, to improve and guarantee communication quality and improve the effect of the power system capacity of space segmentation multiplexing transmission along with this situation.

In addition; If make prediction receive weight for forming the weight structure of least squares error wave beam; Then when the spatial reuse for a plurality of terminal installation 2-1～2-s sends; As with various corresponding Transmit weight of space correlation situation through channel information detected; Quality of reception when terminal installation 2 predictions through having a plurality of receiving element antenna 20-1～20-m have been used channel estimate matrix carried out left singular vector that singular value decomposition obtained can be selected only Transmit weight from the Transmit weight that a plurality of different Transmit weight generating algorithms are generated.

Thus; In channel estimate matrix being carried out the left singular vector that singular value decomposition obtained; Particularly utilize through using and to obtain making the character of signal the maximum quality of reception of noise power ratio (SNR) with the maximum vectorial corresponding left singular vector of singular value; Can be from a plurality of Transmit weight ensemble, selection can obtain making the Transmit weight information of signal to the maximum quality of reception of noise power ratio.

Space correlation between the terminal installation that connects at the same time is lower, and is under the less situation of same channel disturbance ripple, effective especially.In addition; Reception weight in the terminal installation 2 can be determined by channel estimate matrix uniquely;, can select to relax the restriction condition that is used to be reduced in the same channel disturbance under the situation that forms Transmit weight and send the higher Transmit weight of diversity effect than the receiving element antenna number in the terminal installation 2 hour in the spatial reuse fluxion of leading to terminal installation 2.Thus, can obtain to improve and guarantee communication quality and improve the effect of the power system capacity of space segmentation multiplexing transmission along with this situation.

In addition; If prediction receives weight and constitutes the weight structure that forms close-to zero beam; Then when the spatial reuse for a plurality of terminal installation 2-1～2-s sends; As with various corresponding Transmit weight of space correlation situation through channel information detected; The quality of reception when having used least squares error (MMSE) wave beam through terminal installation 2 predictions with a plurality of receiving element antenna 20-1～20-m can be selected only Transmit weight from the Transmit weight that a plurality of different Transmit weight generating algorithms are generated.

Thus; Utilization has formed the weight of least squares error (MMSE) wave beam and can obtain to make the character of signal to the interference noise power quality of reception more maximum than (SINR) through terminal installation 2 uses; Can be from a plurality of Transmit weight information; Selection can obtain to make signal to the Transmit weight information of interference noise power than the maximum quality of reception; In various space correlation situation under the environment that has same channel disturbance ripple, can obtain to improve and guarantee communication quality and improve the effect of the power system capacity of space segmentation multiplexing transmission along with this situation.

In addition; If constituting, transmitted power deciding section 8 has based on selecting Transmit weight information; Decision is for the function of the transmitted power of the spatial reuse signal of a plurality of terminal installation 2-1～2-s; Then when the spatial reuse for a plurality of terminal installation 2-1～2-s sends; As with through various corresponding Transmit weight of spatial reuse situation that channel information detected, the quality of reception when compeling zero (ZF) wave beam has been used in terminal installation 2 predictions through having a plurality of receiving element antenna 20-1～20-m, can from the Transmit weight that a plurality of different Transmit weight generating algorithms are generated, select only Transmit weight.

And; Be used to form the weight of compeling zero (ZF) wave beam through terminal installation 2; Under the constraints of the interference noise power that preferentially suppresses same channel; Utilization can obtain to receive the character of the quality of reception that weight forms, can be from a plurality of Transmit weight information, and selection can obtain to make signal to the Transmit weight information of interference noise power than the maximum quality of reception.Thus, suppress on the basis of same channel disturbance having carried out, can determine the Transmit weight that makes received power maximum, can obtain to improve and guarantee communication quality and improve the effect of the power system capacity of space segmentation multiplexing transmission along with this situation.In addition, the ZF wave beam can calculate with the operand that lacks than the MMSE wave beam, so also can obtain to reduce the low effect of cost of circuit scale, device.

In addition; If radio base station apparatus 1 forms following structure; Promptly; A plurality of Transmit weight information generate part 6-1～6-n, based on the channel information for a plurality of terminal installation 2-1～2-s with one or more receiving element antennas that should carry out the space segmentation multiplexing transmission, are generated by different algorithms and to be used to carry out the Transmit weight information to the space segmentation multiplexing transmission of a plurality of terminal installation 2-1～2-s; Beam selection part 7 based on channel information, selects its Transmit weight with specific algorithm to generate part 6 in advance; Selected Transmit weight information is used as Transmit weight; Have and be used to form the transmission wave beam formation part 9 of sending wave beam; And have the function of carrying out the space segmentation multiplexing transmission, then can under various space correlation situation, improve and guarantee communication quality and improve the power system capacity of space segmentation multiplexing transmission along with this situation.

In addition; A Transmit weight generates the following structure of part 6 formation among part 6-1～6-n if a plurality of Transmit weight generate; That is, have and generate the function be used to form the Transmit weight information of the characteristic vector wave beam of terminal installation 2, then when the spatial reuse for a plurality of terminal installation 2-1～2-s sends; Particularly according to various spatial reuse situation by channel information detected; When the channel between terminal installation is correlated with than hang down, can obtains to use the Transmit weight that the terminal installation 2 of regulation is improved the qualities of reception, and not add the effect of reduction the constraints of alms giver's interference of other-end device 2.

In addition; A Transmit weight generates the following structure of part 6 formation among part 6-1～6-n if a plurality of Transmit weight generate; Promptly; Have to generate and be used for the terminal installation beyond the terminal installation 2 of regulation 2 is reduced the function that the alms giver disturbed or made its Transmit weight information of not disturbing; Then when sending for the spatial reuse of a plurality of terminal installation 2-1～2-s, particularly according to by various spatial reuse situation that channel information detected, the channel between terminal installation is relevant when higher; Can obtain adding on the basis that the alms giver who makes for other-end device 2 disturbs minimum constraints, can use the effect of the Transmit weight that will improve the quality of reception of the terminal installation 2 of regulation.

In addition; A Transmit weight generates the following structure of part 6 formation among part 6-1～6-n if a plurality of Transmit weight generate; That is, the terminal installation 2 of supposing regulation carries out that high specific is synthetic to be received, and has the terminal installation that can generate for beyond the terminal installation 2 of regulation and reduce the function that the alms giver disturbed or made its Transmit weight information of not disturbing; Then when the spatial reuse for a plurality of terminal installation 2-1～2-s sends; Particularly according to by various spatial reuse situation that channel information detected, the channel between terminal installation is relevant higher, when other-end device 2 has a plurality of receiving element antenna 20-1～20-m; Except the terminal installation 2 of regulation, can reduce the alms giver's interference that makes for other-end device 2 and add for minimal constraints number.Thus, can obtain to use the effect of the Transmit weight that will improve to the quality of reception of the terminal installation 2 of regulation.

In addition; A Transmit weight generates the following structure of part 6 formation among part 6-1～6-n if a plurality of Transmit weight generate; Promptly; Have and generate that to be used to form institute important be the function of the Transmit weight information of zero Transmit weight vector, then for the spatial reuse transmission of a plurality of terminal installation 2-1～2-s the time, according to various space correlation situation that channel information detected; Particularly under the relevant condition with higher of the channel between terminal installation, can obtain to use not the effect of the Transmit weight of sending to other-end device 2.

In addition; A Transmit weight constitutes below generating part 6 formation among part 6-1～6-n if a plurality of Transmit weight generate; Promptly; Function with the Transmit weight information that generates the Transmit weight vector be used to form predetermined fixed, then when the spatial reuse for a plurality of terminal installation 2-1～2-s sends, can be according to by various space correlation situation that channel information detected and the Transmit weight of the suitable predetermined fixed of selectively changing.Thus, can obtain under various space correlation situation to improve and guarantee communication quality and improve the effect of the power system capacity of space segmentation multiplexing transmission along with this situation.

In addition; If radio base station apparatus 1 forms following structure; That is, to use the Transmit weight vector that forms by selected Transmit weight information data each by the signal of space segmentation multiplexing transmission, the known in advance burst of insertion and have the function of space segmentation multiplexing transmission; Then when the spatial reuse for a plurality of terminal installation 2-1～2-s sends; Can be according to changing suitable Transmit weight generation method by various space correlation situation that channel information detected, and, even in channel information, comprise under the situation of error; Also can use the known burst of each transmission signal in the terminal installation side, separate the signal that receives institute's spatial reuse.Thus, can obtain under various space correlation situation to improve and guarantee communication quality and improve the effect of the power system capacity of space segmentation multiplexing transmission along with this situation.

In addition, if terminal installation 2 forms following structure, promptly; Known in advance burst based on the signal of each institute's space segmentation multiplexing transmission is given carries out channel estimating, from the spatial reuse signal, separates the signal of expectation; And has the function that generates the reception weight that is used to export; Then when the spatial reuse for a plurality of terminal installation 2-1～2-s sends, can use the known burst of each transmission signal, separate the signal that receives institute's spatial reuse in terminal installation 2 sides.

Thus; Particularly carry out Transmit weight when generating in the channel information that has comprised error at radio base station apparatus 1 side group; Can use each to send the known burst of signal in terminal installation 2 sides; Separate to receive the signal of institute's spatial reuse, can obtain under various space correlation situation, to improve and guarantee communication quality and improve the effect of the power system capacity of space segmentation multiplexing transmission along with this situation.

In addition; If channel estimating part 222 forms following structure with spatial reuse separating part 223, that is, will be in channel estimating part 222 value of the gained as a result of channel estimating as the basis; Have and generate the synthetic weight that receives of high specific as the function that receives weight; Then when the spatial reuse for a plurality of terminal installation 2-1～2-s sends, can use the known burst of each transmission signal, separate the signal that receives institute's spatial reuse in terminal installation 2 sides.

Thus; Particularly carry out Transmit weight when generating in the channel information that has comprised error at radio base station apparatus 1 side group; Can use each to send the known burst of signal in terminal installation 2 sides; Separate receive institute's spatial reuse signal so that received power is maximum, can obtain under various space correlation situation raising and guarantee communication quality and improve the effect of the power system capacity of space segmentation multiplexing transmission along with this situation.

In addition; If channel estimating part 222 forms following structure with spatial reuse separating part 223, that is, will be in channel estimating part 222 value of the gained as a result of channel estimating as the basis; Have and generate the least squares error weight as the function that receives weight; Then when the spatial reuse for a plurality of terminal installation 2-1～2-s sends, can use the known burst of each transmission signal, separate the signal that receives institute's spatial reuse in terminal installation 2 sides.

Thus; Particularly carry out Transmit weight when generating in the channel information that has comprised error at radio base station apparatus 1 side group; Can use each to send the known burst of signal in terminal installation 2 sides; Separate the signal that receives institute's spatial reuse so that the received power of expectation ripple is maximum to interference noise power, can obtain under various space correlation situation, to improve and guarantee communication quality and improve the effect of the power system capacity of space segmentation multiplexing transmission along with this situation.

In addition; If channel estimating part 222 forms following structure with spatial reuse separating part 223; That is, be based on the known in advance burst that is inserted in each signal of space segmentation multiplexing transmission, carry out channel estimating; Left singular vector with the maximum singular value that will carry out singular value decomposition corresponding to the channel estimate matrix to gained and obtain is as the reception weight and the function that generates that are used for separating from the spatial reuse signal signal and the output of expectation; Then when the spatial reuse for a plurality of terminal installation 2-1～2-s sends, can use the known burst of each transmitting antenna, separate the signal that receives institute's spatial reuse in terminal installation 2 sides.

Thus; Be on the basis of minimal constraints particularly having added the alms giver's interference that makes for other-end device 2; Used under the situation of raising to the Transmit weight of the quality of reception of the terminal installation 2 of regulation; Can suppress same channel disturbance ripple for other-end device 2; And make the received power of signal component of institute's spatial reuse maximum, can obtain under various space correlation situation, to improve and guarantee communication quality and improve the effect of the power system capacity of space segmentation multiplexing transmission along with this situation.

In addition; Wireless communications method of the present invention is through comprising: always in the reception signal of self terminal device 2; Extract the channel information between terminal installation 2 and the radio base station apparatus 1, ask the step of the space correlation coefficient between should a plurality of terminal installations of space segmentation multiplexing transmission based on the channel information that is extracted; And,, select the step of the best mode of communication quality according to the space correlation coefficient of obtaining by above-mentioned steps based on the selection processing method that is predetermined from first mode, second mode and Third Way; First mode is, disturbs on the basis of minimal constraints having added the alms giver who makes for other-end device 2, adopts to generate to be used to improve the algorithm of the Transmit weight of the quality of reception of the terminal installation of regulation is generated Transmit weight; Second mode is, the constraints that the additional alms giver who is used to reduce to other-end device 2 disturbs adopts to generate the algorithm that is used to improve to the Transmit weight of the quality of reception of the terminal installation 2 of regulation; Third Way is; Adopt the algorithm that generates single Transmit weight and generate Transmit weight, the space correlation coefficient that is utilized in three different Transmit weight generating modes is divided into a plurality of zones with this specific character in advance to specific relation is arranged on the communication quality characteristic; Can select processing method by setting means; With in each zone, select the best mode of communication quality, after the computer memory coefficient correlation; Can not need to carry out only mode selects at every turn; And select and terminal installation between the Transmit weight generation method that is fit to of space correlation situation, so, can carry out sane space segmentation multiplexing transmission for the space correlation situation of terminal room.Its result can obtain to answer the allocation process of the terminal installation that spatial reuse connects simple, shortens the processing time, improves the effect of the power system capacity of space segmentation multiplexing transmission simultaneously.

(execution mode 2)

Figure 11 representes the radio base station apparatus 100 of embodiment of the present invention 2.In the block diagram; With the difference of the radio base station apparatus 1 of execution mode 1 be; Use selector switch part 107-a to replace beam selection part 7, and obtain between part 4 and the Transmit weight generation part 6-1～6-n, be inserted with selector switch part 107-b at channel information.In addition; From functional point of view; Channel information is obtained part 4 except there being function in the past promptly to carry out also having based on the channel information that is extracted the extraction action of channel information, selects only Transmit weight to generate the selector switch part controlled function of part 6.

On the other hand, selector switch part 107-a and 107-b carry out interlock, and for example when selector switch part 107-b had selected Transmit weight to generate part 6-1, selector switch part 107-a was connected with the output that Transmit weight generates part 6-1.In addition, selector switch part 107-b also generates step switch partly with Transmit weight and carries out interlock, and when the Transmit weight generation part 6 that is connected was connected with the mains, channel information just was transfused to simultaneously.Through this action, only Transmit weight generates partly to be selected and moves when channel information is extracted, obtains the Transmit weight information as its output.

Thus, owing to only make selected Transmit weight generate part 6 actions, so except effect, also can reduce the power consumption in the radio base station apparatus 100 with embodiment of the present invention 1.And, using public CPU to calculate under the situation of the Transmit weight calculating in the Transmit weight generation part 6, occupy CPU owing to have only selected Transmit weight to generate part 6, so can improve the calculation process ability.Its result is as the throughput improve of whole system.

As previously discussed; In embodiment of the present invention 2; Has the structure of selector switch part 107-a, 107-b through making at the two ends of Transmit weight generation part 6-1～6-n; Can obtain under various space correlation situation to improve and guarantee communication quality and improve the effect of the power system capacity of space segmentation multiplexing transmission along with this situation; Selector switch part 107-a, 107-b are based on the channel information for a plurality of terminal installation 2-1～2-s that should the space segmentation multiplexing transmission; Be used for carrying out a plurality of Transmit weight of the Transmit weight of the space segmentation multiplexing transmission of a plurality of terminal installation 2-1～2-s are generated part 6-1～6-n from generation, selecting arbitrarily, Transmit weight generates part 6.

In addition, can select in advance and the suitable Transmit weight generation method of the space correlation situation of terminal room, can carry out the sane spatial reuse of the space correlation situation of terminal room is sent, simplify allocation process in the past based on space correlation coefficient.And, in the power consumption in reducing radio base station apparatus 100, also improve the calculation process ability, as a result of, can obtain to improve effect as the throughput of entire system.In addition, also can obtain to simplify radio base station apparatus 100 thus, and the effect that shortens the processing time that is used for the control of space segmentation multiplexing transmission.

In addition; If transmitted power deciding section 8 forms following structure; Promptly; Has the function that determines based on selected Transmit weight information for the transmitted power of the spatial reuse signal of a plurality of terminal installation 2-1～2-s; Then when sending for the spatial reuse of a plurality of terminal installation 2-1～2-s, can from a plurality of different Transmit weight generating algorithms, select only algorithm and generate the Transmit weight of the various space correlation situation that is suitable for detecting by channel information, and the control signal power of sending with these Transmit weight.

Thus, the signal power of the communication quality of available satisfied regulation is sent, owing to do not use required above transmitted power to send, so can obtain the effect that can reduce same channel disturbance, improve power system capacity.

In addition; A Transmit weight generates the following structure of part 6 formation among part 6-1～6-n if a plurality of Transmit weight generate; That is, have and generate the function be used to form for the Transmit weight information of the characteristic vector wave beam of terminal installation 2-1～2-s, then when the spatial reuse for a plurality of terminal installation 2-1～2-s sends; Particularly according to by various space correlation situation that channel information detected; During the channel between terminal installation relevant low, can not obtain additional to reduce the constraints that the alms giver to other-end device 2 disturbs, will be and can use to the effect of the Transmit weight of the quality of reception raising of prescribed terminal device 2.

In addition; A Transmit weight generates the following structure of part 6 formation among part 6-1～6-n if a plurality of Transmit weight generate; Promptly; Have to generate and be used for reducing the function of disturbing or not producing the Transmit weight information of interference for the terminal installation beyond the terminal installation 2 of regulation 2; Then when sending, particularly according to by various space correlation situation that channel information detected, during the channel between terminal installation relevant higher for the spatial reuse of a plurality of terminal installation 2-1～2-s; Can obtain to disturb on the minimal basis having added to make, can use the effect that will improve the Transmit weight of the quality of reception of prescribed terminal device 2 for the alms giver of other-end device 2.

In addition; A Transmit weight generates the following structure of part 6 formation among part 6-1～6-n if a plurality of Transmit weight generate; That is, the terminal installation 2 of supposing regulation carries out that high specific is synthetic to be received, and has can generate for the terminal installation beyond the terminal installation 2 of regulation 2 and reduce the function that alms givers disturbed or made its Transmit weight information of not disturbing; Then when the spatial reuse for a plurality of terminal installation 2-1～2-s sends; Particularly according to by various space correlation situation that channel information detected, the channel between terminal installation is relevant higher, when other-end device 2 has a plurality of receiving element antenna 20-1～20-m; Except the terminal installation 2 of regulation, can reduce the alms giver's interference that makes for other-end device 2 and add for minimal constraints number.Thus, can obtain to use the effect of the Transmit weight that will improve to the quality of reception of the terminal installation 2 of regulation.

In addition; A Transmit weight constitutes below generating part 6 formation among part 6-1～6-n if a plurality of Transmit weight generate; Promptly; Have to generate and be used to form the function that whole components is the Transmit weight information of zero Transmit weight vector, then when the spatial reuse for a plurality of terminal installation 2-1～2-s sends, particularly according to various space correlation situation by channel information detected; Channel between terminal installation is relevant when higher, can obtain to adopt not the effect of the Transmit weight that other-end device 2 is sent.

In addition; A Transmit weight constitutes below generating part 6 formation among part 6-1～6-n if a plurality of Transmit weight generate; Promptly; Function with the Transmit weight information that generates the Transmit weight vector be used to form predetermined fixed, then when the spatial reuse for a plurality of terminal installation 2-1～2-s sends, can be according to by various space correlation situation that channel information detected and the Transmit weight of the suitable predetermined fixed of selectively changing.Thus, can obtain under various space correlation situation to improve and guarantee communication quality and improve the effect of the power system capacity of space segmentation multiplexing transmission along with this situation.

In addition; If radio base station apparatus 100 forms following structure; That is, to use the Transmit weight vector that forms by selected Transmit weight information data each by the signal of space segmentation multiplexing transmission, the known in advance burst of insertion and have the function of space segmentation multiplexing transmission; Then when the spatial reuse for a plurality of terminal installation 2-1～2-s sends; Can be according to changing suitable Transmit weight generation method by various space correlation situation that channel information detected, and, even in channel information, comprise under the situation of error; Also can use the known burst of each transmission signal in the terminal installation side, separate the signal that receives institute's spatial reuse.Thus, can obtain under various space correlation situation to improve and guarantee communication quality and improve the effect of the power system capacity of space segmentation multiplexing transmission along with this situation.

(execution mode 3)

Figure 12 representes the radio base station apparatus 1-A of embodiment of the present invention 3, and Figure 13 representes terminal installation 2-C.In block diagram; The difference of the radio base station apparatus 1-A of this execution mode and the radio base station apparatus 1 of execution mode 1 is; Comprise that also the separation algorithm information that is used to obtain the spatial reuse separation method information of sending from terminal installation 2-C obtains part 400; And have based on spatial reuse separation method information, in the output of Transmit weight generation part 6-1～6-n, select one beam selection part 401.In addition; The difference of the terminal installation 2-C of this execution mode and the terminal installation 2-A of execution mode 1 is; The spatial reuse separation method storage area 300 that also comprises the spatial reuse separation method storage in the spatial reuse separating part 223 that uses when terminal installation 2-C received; And comprise to output information being that spatial reuse separation method information 301 is carried out the appropriate data processing as spatial reuse separation method storage area, it is transformed to the transmitting section 212-A of high-frequency signal.Below, in main explanation as the above-mentioned structural detail that appends and changed with execution mode 1 different actions.

In Figure 13, the terminal installation 2-C with embodiment of the present invention 3 of a plurality of antennas comprises: transmitting element 210 and transmitting element antenna 216 and receiving element 220 and receiving element antenna 20-1～20-m.

Transmitting element 210 comprises: data input unit 214, and it is transfused to the data message that the terminal use will send; And transmitting section 212-A; To the channel estimating information that sends from channel estimating part 222 and from the output information of the spatial reuse separation method storage area 300 that stores the spatial reuse separation method of spatial reuse separating part 223 is spatial reuse separation method information 301; Carry out appropriate data and handle, and they are transformed to high-frequency signal.In the spatial reuse separation method, the information of the algorithm that uses during the spatial reuse that is included in MMSE, ZF, MLD (Maximum Likelihood Detection, maximum likelihood criterion), SIC (Successive (or Serial)-Interference-Canceller, interference offset device) one by one, PIC (Parallel-Interference-Canceller, parallel model interference eliminator) separates.In addition, through using the table of being classified in advance, the class number that transmission is given, the amount of information in the time of can reducing these message transmission.Perhaps, also can use the table that carries out grade classification by the performance index of the performance of representing separation method.For example, MMSE, the such performance index of ZF are divided into 1 grade, and SIC, the such performance index of PIC are divided into 2 grades, and the such performance index of MLD are divided into 3 grades, use corresponding table.

Receiving element 220 comprises: receiving unit 221-1～221-m, correspond respectively to receiving element antenna 20-1～20-m, and the high-frequency signal that reception antenna 20-1～20-m is received is transformed to baseband signal; Channel estimating part 222, the channel response message of the propagation path from a plurality of baseband signal estimating down-ward links; Spatial reuse separating part 223, the channel response message based on being obtained by channel estimating part 222 separates, extracts expectation ripple signal from the spatial reuse signal; Demodulation part 224 from separate of the expectation ripple signal that receives, will be sent data sequence and restore; And data output section divides 225, and the receiving data sequence that is restored is outputed to other equipment or the terminal installation user is transmitted this information.

Here, transmitting element antenna 216 is handled as different antennas with receiving element antenna 20-1～20-m, but also can shared identical antenna.

Below, the action of relevant radio base station apparatus 1-A and terminal installation 2-C is described.At first, estimated that by terminal installation 2-1～2-s as prerequisite, the action of this information is notified in summary description to radio base station apparatus 1-A with the channel information of down link.

At first; In the transmitting element 210 of terminal installation 2-C; Channel information by the estimated propagation path (not shown) of channel estimating part 222 is directed to transmitting section 212-A, by transmitting section 212-A through control channel or report channel and be sent to radio base station apparatus 1-A.That is, the control channel signals that channel information loaded or report channel signal and be directed to transmitting element antenna 216 is transmitted into propagation path (not shown) to radio base station apparatus 1-A from transmitting element antenna 216.

Here, control channel or to report channel be the communication channel that is used to make the information contact that radio base station apparatus 1-A and terminal installation 2-C move effectively is the communication channel different communication channel of the contact of user with the terminal installation 2-C information that will send reception.

Have again; The information that the user of terminal installation 2-C will send is imported into transmitting section 212-A from data input unit 214; It is carried out the appropriate signals processing, and after being transformed to high-frequency signal, is sent to radio base station apparatus 1-A through transmitting element antenna 216.

Then; In radio base station apparatus 1-A; Channel information obtain part 4 from a plurality of terminal installation 2-1～2-s with terminal installation 2C structure to control channel signals that antenna for base station 11-1～11-s sends or report among the channel signal; Extract the channel information that each terminal installation 2-1～2-s sends respectively, and they are outputed to Transmit weight deciding section 5.

Then; Summary description is based on the channel information and the spatial reuse separation method information of the down link of being notified, and the transmission signal times that mails to terminal installation 2-1～2-s that should spatial reuse connects (being assigned with) is carried out the action of space segmentation multiplexing transmission with suitable Transmit weight.

At first; In radio base station apparatus 1-A; Channel information obtain part 4 from terminal installation 2-1～2-s of should spatial reuse connecting (being assigned with) to control channel signals that antenna for base station 11-1～11-s sends or report among the channel signal; Extract the channel information that sends from each terminal installation 2-1～2-s respectively, and they are outputed to Transmit weight deciding section 5.The channel information that extracted this moment is the channel information of the down link from radio base station apparatus 1-A to terminal installation 2-1～2-s.In addition; Separation algorithm information obtains the control channel signals that part 400 sends to antenna for base station 11-1～11-s from terminal installation 2-1～2-s of should spatial reuse connecting (being assigned with) or reports the channel signal; Extract the spatial reuse separation method information of sending respectively, and they are outputed to Transmit weight deciding section 5 from each terminal installation 2-1～2-s.

Then; Transmit weight deciding section 5 is for the terminal installation 2-1～2-s that should spatial reuse connects; In order to carry out only signal transmission according to conditions associated between terminal installation, generate multiple Transmit weight and generate information through making a plurality of Transmit weight generate part 6-1～6-n with different separately Transmit weight generating algorithms.Then; Through beam selection part 401; Generate among the ensemble from generate a plurality of Transmit weight that part 6-1～6-n generated by the 1st to n Transmit weight; Selection makes the maximum Transmit weight information of determinating reference of regulation, and this information is outputed to transmitted power deciding section 8 and sends wave beam formation part 9.

Then, transmitted power deciding section 8 is based on the Transmit weight information of being imported, and calculating is used to determine the power partition coefficient for the transmitted power of each spatial reuse stream.

On the other hand; Sending signal generation part 3-1～3-s; Generate respectively and mail to the signal that should spatial reuse connects the terminal installation 2-1～2-s of (being assigned with) (below, be called and send data sequence), these signals are sent out after appropriate signals is handled having been carried out.

Then, in power coefficient multiplier 10-1～10-s, send the signal output that signal generates part 3-1～3-s, multiply by the power partition coefficient of being calculated by transmitted power deciding section 8 for each.Then; Send wave beam and form part 9 for each transmission sequence of data frames signal that multiply by power partition coefficient; Based on Transmit weight information, generate the symbol data of the base band of the Transmit weight that multiply by (selected) wave beam that is used to form regulation from beam selection part 401.Then, with the symbol data of base band be numerical data through not shown digital-to-analog converter, frequency band limits filter and frequency converter, carry out the digital-to-analog conversion, and then carrying out after the frequency band limits, output is transformed to the high-frequency signal of carrier frequency.Then, wireless base station antenna 11-1～11-s sends to not shown propagation path (space) to the terminal installation 2-1～2-s that should spatial reuse connects with the high-frequency signal of being supplied with.

Here, among relevant terminal installation 2-1～2-s in radio base station apparatus 1 by the reception processing action of the signal of space segmentation multiplexing transmission, because identical, so omit explanation with execution mode 1.

For above detailed action, generate the determining method that the Transmit weight generating algorithm of being packed among part 6-1～6-n reaches [3] transmit power assignment coefficient for [1] Transmit weight, identical with execution mode 1, omit detailed explanation.Below, specify Transmit weight information selection method with [2] relevant beam selection part 401 of execution mode 1 different actions.

The detailed description of the Transmit weight information selection method in the relevant beam selection part 401

Here, specify Transmit weight information selection method in the relevant beam selection part 401.Beam selection part 401 generates among a plurality of Transmit weight ensemble that part 6-1～6-n generated from the 1st～the n Transmit weight, selects to make the maximum Transmit weight information of determinating reference of regulation.As determinating reference, calculate based on obtaining the output of part 400 and to be used to represent that the signal that received by terminal installation 2-C is to noise power ratio (SNR) or the signal predicted value to the physical quantity of the signal quality of disturbing wave power ratio (SINR) etc. from separation algorithm information.This respect be with execution mode 1 in the different aspect of beam selection part 7.

That is, in execution mode 1, in the antenna number of terminal installation 2-k when being a plurality of; Suppose to form the directive property that receives weight R (k); Estimate thereby carry out SINR, but in this execution mode, based on as the i.e. spatial reuse separation method information of this terminal installation 2-k of the output that obtains part 400 from separation algorithm information with (formula 17); Use generates and receives weight R (k) for the channel information H (k) of k terminal installation 2-k.Here, receive the row vector of weight R (k) expression terminal installation 2-k with the individual element of receiving element antenna number Nr (k).In (formula 17), subscript ' n ' is illustrated in user terminal, promptly carries out sequentially having added on each terminal installation 2 that spatial reuse connects number under the situation of number, in the present embodiment corresponding to terminal installation 2-1～2-s.In addition,, when having the disturbing wave component, can adopt MMSE method, ZF method, characteristic vector wave beam method of reseptance,, comprise the synthetic weight etc. that receives of high specific even do not considering under the also passable situation of disturbing wave component as spatial reuse separation method information.

Will be through aforementioned calculation at the Wn (k) shown in (formula 17) as variable, calculate each user's SINRn (k).Generate whole each users' of outputs calculating of part SINRn (k) for the 1st～the n Transmit weight.Then, selecting generation is made the output information that generates part 6-s from the s Transmit weight of the maximum Transmit weight of these each users' the summation of SINRn (k) is Transmit weight Ws (k).Wherein, k=1～Ns.

As stated, in embodiment of the present invention 3,, predict that SINR estimates through utilizing the spatial reuse separation method information of sending from terminal installation.Thus, can make prediction SINR evaluation of estimate more near the SINR that terminal installation received by reality.Therefore, can use such prediction SINR, select Transmit weight,, can improve the communication quality of the terminal installation 2 that communicates, can increase capability of communication system so can select only Transmit weight.

In addition, owing to when the calculating of transmit power assignment coefficient, also use prediction SINR,, can carry out only power division through making prediction SINR evaluation of estimate more near by the such effect of the SINR that terminal installation received of reality.Through such transmission power control; Can use the communication quality of the terminal installation 2 that enough required level (level) guarantees to communicate; Need not with transmitted power bring up to required more than; So in cellular system, adopt under the situation of this execution mode, have and can reduce presence of intercell interference, increase the effect of capability of communication system.

(execution mode 4)

Figure 14 representes the radio base station apparatus 1-B of embodiment of the present invention 4, and Figure 15 representes terminal installation 2-D.In block diagram; With the difference of the radio base station apparatus 1 of execution mode 1 be; Comprise that also other area interference information that obtain other area interference information of sending from terminal installation 2-D obtain part 410; Have simultaneously based on other area interference information that obtain, in the output of Transmit weight generation part 6-1～6-n, select one beam selection part 411.

In addition, the different aspect with the terminal installation 2-A of execution mode 1 is that terminal installation 2-D comprises: other area interference test sections 302 are determined at the disturbance regime from other sub-districts that receives when receiving; And transmitting section 212-B, to other area interference information 310, carry out appropriate data and handle, and it is transformed to high-frequency signal as the output information of other area interference test sections.Below, main explanation about in the above-mentioned structural detail that appends and changed and execution mode 1 different actions.

In Figure 15, the terminal installation 2-D with embodiment of the present invention 4 of a plurality of antennas comprises: transmitting element 210 and transmitting element antenna 216 and receiving element 220 and receiving element antenna 20-1～20-m.

Transmitting element 210 comprises: data input unit 214, and it is transfused to the data message that the terminal use will send; And transmitting section 212-B, the channel estimating information that sends from channel estimating part 222 and other area interference information of exporting from other area interference test sections 302 are carried out the appropriate data processing, and they are transformed to high-frequency signal.

Receiving element 220 comprises: receiving unit 221-1～221-m, correspond respectively to receiving element antenna 20-1～20-m, and the high-frequency signal that reception antenna 20-1～20-m is received is transformed to baseband signal; Channel estimating part 222, the channel response message of the propagation path from a plurality of baseband signal estimating down-ward links; Spatial reuse separating part 223, the channel response message based on being obtained by channel estimating part 222 separates, extracts expectation ripple signal from the spatial reuse signal; Demodulation part 224 from separate of the expectation ripple signal that receives, will be sent data sequence and restore; And data output section divides 225, and the receiving data sequence that is restored is outputed to other equipment or the terminal installation user is transmitted this information.

Here, transmitting element antenna 216 is handled as different antennas with receiving element antenna 20-1～20-m, but also can shared identical antenna.

Below, the action of relevant radio base station apparatus 1-B and terminal installation 2-D is described.At first, estimated that by terminal installation 2-1～2-s as prerequisite, the action of the channel information of this down link is notified in summary description to radio base station apparatus 1-B with the channel information of down link.

At first; In the transmitting element 210 of terminal installation 2-D; Channel information by the estimated propagation path (not shown) of channel estimating part 222 is directed to transmitting section 212-B, by transmitting section 212-B through control channel or report channel and be sent to radio base station apparatus 1-B.That is, the control channel signals that channel information loaded or report channel signal and be directed to transmitting element antenna 216 is transmitted into propagation path (not shown) to radio base station apparatus 1-A from transmitting element antenna 216.

Here, control channel or to report channel be the communication channel that is used to make the information dealing that radio base station apparatus 1-B and terminal installation 2-D move effectively is the communication channel different communication channel that will send the information dealing of reception with the user of terminal installation 2-D.

Have again; The information that the user of terminal installation 2-D will send is imported into transmitting section 212-B from data input unit 214; It is carried out the appropriate signals processing, and after being transformed to high-frequency signal, is sent to radio base station apparatus 1-B through transmitting element antenna 216.

Then; In radio base station apparatus 1-B; Channel information obtain part 4 from a plurality of terminal installation 2-1～2-s with terminal installation 2-D structure to control channel signals that antenna for base station 11-1～11-s sends or report among the channel signal; Extract the channel information that each terminal installation 2-1～2-s sends respectively, and they are outputed to Transmit weight deciding section 5.

Then; Summary description is based on the channel information and the spatial reuse separation method information of the down link of being notified; With mail to terminal installation 2-1～2-s of should spatial reuse connecting, be the transmission signal times of terminal installation 2-1～2-s of being distributed with suitable Transmit weight, thereby carry out the action of space segmentation multiplexing transmission.

At first; In radio base station apparatus 1-B; Channel information obtain part 4 from terminal installation 2-1～2-s of should spatial reuse connecting to control channel signals that antenna for base station 11-1～11-s sends or report among the channel signal; Extract the channel information that sends from each terminal installation 2-1～2-s respectively, and they are outputed to Transmit weight deciding section 5.The channel information that extracted this moment is the channel information of the down link from radio base station apparatus 1-B to terminal installation 2-1～2-s.In addition; Other area interference information obtain the control channel signals that part 410 sends to antenna for base station 11-1～11-s from terminal installation 2-1～2-s of should spatial reuse connecting (being assigned with) or report the channel signal; Extract other area interference information of sending respectively, and they are outputed to Transmit weight deciding section 5 from each terminal installation 2-1～2-s.

Then; Transmit weight deciding section 5 is for the terminal installation 2-1～2-s that should spatial reuse connects; Generate multiple Transmit weight and generate information through making a plurality of Transmit weight generate part 6-1～6-n, so that carry out only signal transmission according to conditions associated between terminal installation with different separately Transmit weight generating algorithms.

Then; Through beam selection part 411; Generate among the ensemble from generate a plurality of Transmit weight that part 6-1～6-n generated by the 1st to n Transmit weight; Selection makes the maximum Transmit weight information of determinating reference of regulation, thereby selected Transmit weight information is outputed to transmitted power deciding section 8 and sends wave beam formation part 9.

Then, transmitted power deciding section 8 is based on the Transmit weight information of being imported, and calculating is used to determine the power partition coefficient for the transmitted power of each spatial reuse stream.

On the other hand; Sending signal generation part 3-1～3-s; Generate and mail to and should spatial reuse connect the signal (below, be called and send data sequence) of the terminal installation 2-1～2-s of (by priority allocation) respectively, these signals are handled the back and are exported having been carried out appropriate signals.

Then, in power coefficient multiplier 10-1～10-s, send the signal output that signal generates part 3-1～3-s, multiply by the power partition coefficient of being calculated by transmitted power deciding section 8 for each.Then; Send wave beam and form part 9 for each transmission sequence of data frames signal that multiply by power partition coefficient; Based on Transmit weight information, generate and multiply by the wave beam that is used to form regulation, be the symbol data of base band of the Transmit weight of selected wave beam from beam selection part 411.Then, with the symbol data of base band be numerical data through not shown digital-to-analog converter, frequency band limits filter and frequency converter, carry out the digital-to-analog conversion, and then carrying out after the frequency band limits, output is transformed to the high-frequency signal of carrier frequency.

Then, wireless base station antenna 11-1～11-s sends to not shown propagation path (space) to the terminal installation 2-1～2-s that should spatial reuse connects with the high-frequency signal of being supplied with.

Here, among relevant terminal installation 2-1～2-s in radio base station apparatus 1-B by the reception processing action of the signal of space segmentation multiplexing transmission, because identical, so omit explanation with execution mode 1.

For above detailed action, generate the determining method that the Transmit weight generating algorithm of being packed among part 6-1～6-n reaches [3] transmit power assignment coefficient for [1] Transmit weight, identical with execution mode 1, omit detailed explanation.Below, specify Transmit weight information selection method with [2] relevant beam selection part 411 of execution mode 1 different actions.

The detailed description of the Transmit weight information selection method in the relevant beam selection part 411

Here, specify Transmit weight information selection method in the relevant beam selection part 411.

Beam selection part 411 generates among a plurality of Transmit weight ensemble that part 6-1～6-n generated from the 1st～the n Transmit weight, selects to make the maximum Transmit weight information of determinating reference of regulation.As determinating reference, calculate based on obtaining the output of part 410 and to be used to represent that the signal that received by terminal installation 2-D is to noise power ratio (SNR) or the signal predicted value to the physical quantity of the signal quality of disturbing wave power ratio (SINR) etc. from other area interference information.This respect be with execution mode 1 in the different aspect of beam selection part 7.

Promptly; In execution mode 1, when being a plurality of, suppose to form the directive property that receives weight R (k) in the antenna number of channel information H (k) and terminal installation 2-k; Thereby carrying out SINR with (formula 17) estimates; But in this execution mode, also use (formula 28) to carry out SINR and estimate, (formula 28) comprised other area interference information F (k) as this terminal installation 2-k of the output that obtains part 410 from other area interference information.

[formula 28]

${\mathrm{SINR}}_n\left(k\right)=\frac{{\left|R\left(k\right)H\left(k\right)W_n\left(k\right)\right|}^2}{\underset{j=1,j\≠k}{\overset{\mathrm{Ns}}{\mathrm{\Σ}}}{\left|R\left(k\right)H\left(k\right)W_n\left(j\right)\right|}^2+{\mathrm{\σ}}^2{\left|\right|R\left(k\right)\left|\right|}^2+F\left(k\right)}$

Wherein, receive the row vector of weight R (k) expression terminal installation 2-k with the individual element of receiving element antenna number Nr (k).In (formula 28), subscript ' n ' is illustrated in user terminal, promptly carries out sequentially having added in each terminal installation 2 that spatial reuse connects number under the situation of number, in the present embodiment corresponding to terminal installation 2-1～2-s.In addition,, when having the disturbing wave component, can adopt MMSE method, ZF method, characteristic vector wave beam method of reseptance,, comprise the synthetic weight etc. that receives of high specific even do not considering under the also passable situation of disturbing wave component as spatial reuse separation method information.

Will be through aforementioned calculation at the Wn (k) shown in (formula 28) as variable, calculate each user's SINRn (k).Generate whole each users' of outputs calculating of part SINRn (k) for the 1st～the n Transmit weight.Then, to select generation is made the output information that generates part 6-s from the s Transmit weight of the maximum Transmit weight of these each users' the summation of SINRn (k) be Transmit weight Ws (k) for beam selection part 411.Wherein, k=1～Ns.

As stated, in embodiment of the present invention 4,, predict that SINR estimates through utilizing other area interference information of sending from terminal installation 2-D.Thus, can only calculate the prediction SINR that has reflected other area interference situations with channel information, its result can make prediction SINR evaluation of estimate more near the actual SINR that terminal installation received.

Therefore, can use such prediction SINR, select Transmit weight,, can improve the communication quality of the terminal installation 2 that communicates, can increase capability of communication system so can select only Transmit weight.

In addition, owing to when the calculating of transmit power assignment coefficient, also use prediction SINR,, can carry out only power division through making prediction SINR evaluation of estimate more near by the such effect of the SINR that terminal installation received of reality.

Through such transmission power control; The communication quality of the terminal installation 2 that can guarantee to communicate is in required but enough levels; And need not with transmitted power bring up to required more than; So in cellular system, adopt under the situation of this execution mode, have and can reduce presence of intercell interference, increase the effect of capability of communication system.

Have again, in this execution mode, other area interference information are sent to radio base station apparatus 1-B, but, also can adopt the structure of terminal installation 2-E shown in Figure 16 as other structure from terminal installation 2-D.The terminal installation 2-E of Figure 16 and not being both of terminal installation 2-D, between other area interference test sections 302 and transmitting section 212-C of Figure 15, being provided with could space segmentation multiplexing transmission decision section 303.

Here; Could space segmentation multiplexing transmission decision section 303 carry out the comparison between the threshold value 304 of output valve and regulation of other area interference test sections 302; Other area interference greater than the regulation threshold value the time; Be judged as when carrying out the space segmentation multiplexing transmission and can't guarantee enough communication qualities, the space segmentation multiplexing transmission prohibition information that terminal installation 2-E will not carry out the space segmentation multiplexing transmission sends to radio base station apparatus 1-B as other area interference information.On the other hand, radio base station apparatus 1-B obtains other area interference information, when comprising space segmentation multiplexing transmission prohibition information therein, does not carry out the communication of space segmentation multiplexing transmission pattern.

According to above structure, can could carry out the space segmentation multiplexing transmission by terminal installation 2 judgements according to other area interference situations.This is because of the threshold setting for other area interference; Generally depend on the performance of the receive mode of terminal installation; Because radio base station apparatus 1 can't carry out unified judgement; So, can realize the control of the space segmentation multiplexing transmission of radio base station apparatus 1 with mode more suitably based on the result of determination of terminal installation 2.Thus, particularly in the zone that can not ignore from the interference of other sub-districts of cell edge etc., can guarantee communication quality.

Through the action of above explanation,, under various presence of intercell interference situation, can obtain to improve and guarantee communication quality and improve the effect of the power system capacity of space segmentation multiplexing transmission along with this presence of intercell interference situation according to this execution mode.

Industrial utilization property

Radio base station apparatus of the present invention and terminal installation; Have from the Transmit weight ensemble of a plurality of different algorithms; Select with should the terminal installation of spatial reuse connection between the function of the corresponding only weight information of spatial correlation characteristic; Simplifying radio base station apparatus, reducing on the basis of processing delay, improve the capacity of system, thus so can be applicable to adopt the wireless communication field of spatial reuse.

Claims (17)

1. radio base station apparatus comprises:

A plurality of Transmit weight generate parts, based on the channel information for a plurality of terminal installations that should the spatial reuse transmission, are created on employed Transmit weight information in the formation of the transmission wave beam that said a plurality of terminal installations are sent through different algorithms;

The beam selection part, any one of a plurality of said Transmit weight information of selecting to generate through said algorithm; And

Send wave beam and form part, adopt selected said Transmit weight information, form said transmission wave beam,

Said beam selection part based on notify by said terminal installation, expression comprised the information of signal and the power ratio of interference noise in the said terminal installation of other area interference information, selection Transmit weight information.

2. radio base station apparatus as claimed in claim 1 wherein, also comprises:

The transmitted power deciding section based on the Transmit weight information of said selection, determines the transmitted power of said spatial reuse transmission.

3. radio base station apparatus as claimed in claim 1, wherein,

Said beam selection part is selected Transmit weight information based on the information of the power ratio of signal in the said terminal installation of expression and interference noise.

4. radio base station apparatus as claimed in claim 1, wherein,

When said beam selection part receives at the enough a plurality of antennas of said terminal installation ability, after having used the prediction reception weight that the reception weight in the said terminal installation is predicted, select Transmit weight information.

5. radio base station apparatus as claimed in claim 4, wherein,

It is the weight that forms the synthetic received beam of high specific that said prediction receives weight.

6. radio base station apparatus as claimed in claim 4, wherein,

It is that channel matrix is carried out the left singular vector that singular value decomposition obtained that said prediction receives weight.

7. radio base station apparatus as claimed in claim 4, wherein,

It is the weight that forms the least squares error wave beam that said prediction receives weight.

8. radio base station apparatus as claimed in claim 4, wherein,

It is the weight that forms close-to zero beam that said prediction receives weight.

9. radio base station apparatus as claimed in claim 4, wherein,

Said prediction receives weight and is based on the spatial reuse separation algorithm of being notified by terminal installation and the weight that forms.

10. radio base station apparatus as claimed in claim 4, wherein,

Said prediction receive weight be the spatial reuse transmission that could carry out notifying in expression by terminal installation could result of determination when forbidding judging, forbid the weight that spatial reuse transmits.

11. radio base station apparatus as claimed in claim 1, wherein,

Said beam selection part selects its Transmit weight with predetermined algorithm to generate part based on said channel information.

12. like claim 1 or 11 any one described radio base station apparatus, wherein,

The Transmit weight that said a plurality of Transmit weight generates in the part generates the Transmit weight information for the characteristic vector wave beam of said terminal installation that is used to form that partly generates.

13. like claim 1 or 11 any one described radio base station apparatus, wherein,

The Transmit weight generation part that said a plurality of Transmit weight generates in the part generates the Transmit weight information that will disturb reduction for the alms giver of the terminal installation beyond the terminal installation of regulation or it not disturbed.

14. like claim 1 or 11 any one described radio base station apparatus, wherein,

After having supposed that the terminal installation of stipulating carries out the synthetic reception of high specific, the Transmit weight generation part generation that said a plurality of Transmit weight generate in the part will be disturbed reduction for the alms giver of the terminal installation beyond the terminal installation of regulation or not produce the Transmit weight information of interference.

15. like claim 1 or 11 any one described radio base station apparatus, wherein,

A Transmit weight generation part in said a plurality of Transmit weight generation partly generates and is used to form whole components is the zero vectorial Transmit weight information of Transmit weight.

16. like claim 1 or 11 any one described radio base station apparatus, wherein,

The Transmit weight that said a plurality of Transmit weight generates in the part generates the Transmit weight information that part generates the Transmit weight vector that is used to form predetermined fixed.

17. like claim 1 or 11 any one described radio base station apparatus, wherein,

Said transmission wave beam form part use by the said Transmit weight information of selecting formed Transmit weight vector, by each signal of spatial reuse transmission in, insert known in advance burst and carry out the spatial reuse transmission.

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