CN104022806B - Wireless communication system and wireless communications method - Google Patents

Abstract

Wireless communication system and wireless communications method are provided.Suppress interference, realize the raising of radio transmission characteristics.Have：Base station (10 1)；Relay station (20), it carries out relaying transmission to the relaying object data received from base station (10 1)；And the base station (10 2) neighbouring with base station (10 1), base station (10 2) according to relay station (20) relay the timing of transmission, using the Radio Resource identical Radio Resource used with relay station (20) in relaying is sent, the data identical data sent with relay station (20) relaying are sent.

Description

Wireless communication system and wireless communications method

The application is based on the 42nd article of proposition of Patent Law detailed rules for the implementation, and it is December 26, Application No. in 2008 applying date to be 200880132479.7 application for a patent for invention " wireless communication system " divisional application.

Technical field

The present invention relates to wireless communication system.As wireless communication system, such as including mobile communications system, wireless LAN(Local Area Network：LAN).

Background technology

In recent years, the mobile communications standard as mobile phone etc., referred to as LTE (Long Term Evolution： Long Term Evolution) new high-speed communication service expected by people, in addition, 3GPP (3rd Generation Partnership Project, third generation partner program) studying the LTE-Advanced systems that version is improved as LTE.

In addition, its purpose also resides in, proposed LTE-Advanced systems as IMT-Advanced systems, the IMT- Advanced systems are ITU-R (International Telecommunication Union Radio communications sector：International Telecommunication Union's Radiocommunication Sector) determine the IMT to be studied (International Mobile Telecommunication：Ternational Mobile Telecommunications) -2000 systems improvement version.

In addition, in the representational example of IMT-2000 systems, there is W-CDMA (Wideband-Code Division Multiple Access, WCDMA), CDMA one and WiMax (Worldwide Interoperability for Microwave Access, worldwide interoperability for microwave accesses).

In LTE-Advanced systems, based on LTE system, studying from multiple base stations and sending identical MBMS The MBSFN of (Multimedia Broadcast Multicast Service, multimedia broadcast multi-broadcasting business) data (Multimedia Broadcast multicast service Single Frequency Network：Multimedia broadcasting is more Broadcast business Single Frequency Network) and carry out wireless relay relay (relay station) importing (in addition, also study it is up/under The widening of row bandwidth, importing of Uplink MIMO (Multiple Input Multipe Output, multiple-input, multiple-output) etc.).Hereinafter, Illustrated by taking LTE-Advanced systems as an example.

(1) on MBMS and MBSFN.

In MBMS, (report) data can be sent to not specific or specific user.Specifically, it is contemplated that broadcast (Broadcast) information such as news or to specific user send (Multicast, multicast) information.

In addition, the sending method as the data reporting (MBMS data) based on MBMS, studying makes from multiple base stations The MBSFN of the transmission of same MBMS data is synchronously carried out with identical Radio Resource.

MBSFN SFN (Single Frequency Network：Single Frequency Network) mean to use same wireless frequency. That is, sending zone (MBSFN regions) has been normally set up in MBSFN, when carrying out the transmission of MBMS data, has been made in the region With identical wireless frequency (with reference to TS36.300V8.6.015MBMS).

Therefore, in MBSFN, identical data are sent from multiple base stations with same frequency and same timing, so mobile Platform receives the MBMS data sent from multiple base stations.Also, for example, in OFDM (Orthogonal Frequency Division Multiplexing：Orthogonal frequency division multiplexi) receive in the case of, if each wireless signal sent from multiple base stations The deviation for receiving timing is CP (Cyclic Prefix：Cyclic prefix) below length, then CP is removed, carry out FFT (Fast Fourier Transform：Fast Fourier Transform (FFT)) processing, the signal of the identical content thus, it is possible to synthesize same frequency, suppression Intersymbol interference processed.

Here, CP is also known as GI (Guard Interval：Protection interval).In addition, the CP ratios used in MBSFN exist The CP added in the unicast data generally to communicate is slightly long.

Figure 17 is the figure for the form for showing wireless data.Wireless data includes CP and data, and CP when unicast is sent is claimed It is referred to as extending (Extended) CP for standard (Normal) CP, MBSFN CP.Standard CP length is 4.69 μ sec, with it Relatively, MBSFN CP length (the CP length of MBMS data) is 16.67 μ sec.

Figure 18 is the figure for the reception relation for showing data.It is assumed that mobile station 120 receives the MBMS data sent from base station B (data b) is set to, after data b receptions, when delaying time t, receives from the base station A MBMS datas sent and (is set to data A) (data a, b are the data reportings of identical services content).

If in the time range of CP length of the time delay t the reception start time from data b, mobile station Signal in a period of 120 taking-ups are corresponding with during CP, it is thus interior during FFT processing simply to include with the transmission of identical frequency Same data, so reception processing can be carried out while intersymbol interference is suppressed.So, in MBSFN, although CP becomes It is long, but correspondingly can also receive the MBMS numbers sent from the base station for base station (being base station A in this instance) apart from each other According to being synthesized.

(2) on relay (relay station).

In LTE-Advanced systems, such as expansion (Cell extension, cell expansion for service area range Exhibition) or insensitive region (Dead spot, dead point) countermeasure, by relay station (Relay) set between the base station and mobile station.

Figure 19 is to show the figure that service area range expands.Mobile station 120 is located at the cell 100a of base station 100 outside. In addition, being provided with relay station 110 in cell 100a, the region that relay station 110 can be relayed is set to relay area 110a, Mobile station 120 is located in the 110a of relay area.

If there is no 110 this terminal of relay station, then because mobile station 120 is located at outside cell 100a, so can not Communicated with base station 100.But if relay station 110 and mobile station 120 is set to be present in the relay area 110a of relay station 110 It is interior, even if then mobile station 120 is in outside cell 100a, also wireless relay can be carried out via relay station 110, thus allowed for Base station 100 and the communication of mobile station 120.

Figure 20 is the figure for showing insensitive region countermeasure.Relay station 110 is set in the cell 100a of base station 100, small Dead band domain 110b in area 100a be present, mobile station 120 is located in insensitive region 110b.Further, it is assumed that relay station 110 Relay area 110a covers insensitive region 110b.

It is if there is no 110 this terminal of relay station, then difficult when mobile station 120 is in insensitive region 110b To be communicated with base station 100.But if set the relay area 110a of relay station 110 and relay station 110 coverings ineffective Quick region 110b, even if then mobile station 120 is in insensitive region 110b, also wireless relay can be carried out via relay station 110, Base station 100 is thus allowed for communicate with mobile station 120.

As the existing technology associated with MBMS, following technology is proposed in patent document 1：Mobile station according to The transmit power difference of CPICH Common Pilot Channel and CCCH comes from cell quality highest neighbour to estimate cell quality, receive The data of nearly cell.

In addition, as existing wireless relaying technique, following technology is proposed in patent document 2：In dispensing device Side, the receiver signal to the relay signal sent again for relay and for being sent directly to receiver It is transmitted after carrying out stratification, in relay, is modulated again after being demodulated to relay with signal To send again.

Patent document 1：Japanese Unexamined Patent Application Publication 2008-503130 publications (numbered paragraphs [0015]~[0020], Fig. 1)

Patent document 2：Japanese Unexamined Patent Publication 10-032557 publications (numbered paragraphs [0019]~[0021], Fig. 1)

The content of the invention

Invent the problem solved

As described above, in MBMS wireless network, the expansion of service area range can be carried out by configuring relay station And insensitive region countermeasure.In addition, in MBSFN, using the expansion longer than the standard CP used in usual unicast of CP length CP is opened up to transmit wireless signal.Therefore, for the wireless signal from the base station away from mobile station, can also enter via relay station Row receives, it is possible to increase the possibility of the reception synthesis of more data.

But there is following problem in existing MBMS wireless network：In the MBMS numbers sent by relay station relays Interference can be produced according between the data (for example, unicast data) sent from other base stations.

Figure 21 is figure the problem of showing to produce interference.It is configured with base station 101~103, mobile station 121~123, relay station 110.Base station 101 sends unicast data r1 to mobile station 121, and base station 103 sends unicast data r3 to mobile station 123.In addition, base Stand 102 to relay station 110 send MBMS data r2, relay station 110 by MBMS data r2 relaying be sent to mobile station 122.

In the case of Figure 21, mobile station 121 is in the position that can receive unicast data r1 and MBMS data r2 both sides, moves Dynamic platform 123 is in the position that can receive unicast data r3 and MBMS data r2 both sides.

In the case of this environment, for the mobile station 121,123 for receiving unicast data, sent out from relay station 110 The MBMS data r2 sent is interference ripple.

Figure 22 is to show to produce the figure of interference due to timing offset.Black time slot represents the MBMS numbers sent based on MBSFN According to white time slot represents unicast data.For example, when observing timing T1,2 MBMS numbers are sent from different base stations in same timing According to mobile station can synthesize the same MBMS data for receiving and being sent from different base station.

But, it is assumed that due to the relay processing delays of relay station, send sequence A1 and postpone, as transmission sequence A1a Sent from relay station.In the case, relay station sends the MBMS data (hair sent from neighbouring base station synchronization in timing T2 Send the initial black time slot in sequence A1, B1).

But base station all sends other data in timing T2.Therefore, the MBMS data that relay station is sent in timing T2 into For relative to the interference of the data sent from other base stations, in addition, the data sent from other base stations turn into relative in timing The interference for the data that T2 is sent from relay station, so as to cause the reduction of transmission quality.

This problem is not limited to MBMS data, when carrying out the relaying transmission using relay station, due to delay can be produced, because This is also possible to produce this problem.That is, in relay station relay the timing of transmission, neighbouring wireless base station use and relaying Stand the Radio Resource that the Radio Resource that uses is shared in relaying is sent, send different data, therefore can also produce the problem.

The present invention be in view of the problem and complete, its object is to provide suppress relaying send caused by disturb and realize The wireless communication system that radio transmission characteristics improve.

The means to solve the problem

In the 1st mode, wireless communication system has：1st wireless base station；Relay station, it from the 1st wireless base station to receiving To relaying object data carry out relaying transmission；And the 2nd wireless base station, it is neighbouring with the 1st wireless base station, the 2nd wireless base station With transmitter, the transmitter according to relay station relay the timing of transmission, is used using with relay station in relaying is sent Radio Resource identical Radio Resource, send with relay station relays send relaying object data identical data.

Preferably, the 1st wireless base station according further to relay station relay the timing of transmission, is being relayed using with relay station The Radio Resource identical Radio Resource used in transmission, send and relaying object data identical data.

The effect of invention

Realize the raising of radio transmission characteristics.

By the related the description below of the accompanying drawing of the preferred embodiment to being denoted as example of the present invention, of the invention is upper State and other purposes, feature and advantage will become more apparent.

Brief description of the drawings

Fig. 1 is the figure for the configuration example for showing wireless communication system.

Fig. 2 is the figure for showing MBMS (MBSFN) network.

Fig. 3 is the figure for the sequence of movement for showing MBMS (MBSFN) network.

Fig. 4 is the figure for showing wireless communication system.

Fig. 5 is the figure for the structure for showing base station.

Fig. 6 is the figure for the structure for showing relay station.

Fig. 7 is the figure for the structure for showing relay station.

Fig. 8 is the figure for the structure for showing mobile station.

Fig. 9 is the figure for the structure for showing wireless communication system.

Figure 10 is the figure for the sequence of movement for showing wireless communication system.

Figure 11 is the figure for the structure for showing wireless communication system.

Figure 12 is the figure for the sequence of movement for showing wireless communication system.

Figure 13 is the figure for the structure for showing wireless communication system.

Figure 14 is the figure for the sequence of movement for showing wireless communication system.

Figure 15 is the figure for the structure for showing wireless communication system.

Figure 16 is the figure for the structure for showing wireless communication system.

Figure 17 is the figure for the form for showing wireless data.

Figure 18 is the figure for the reception relation for showing data.

Figure 19 is to show the figure that service area range expands.

Figure 20 is the figure for showing insensitive region countermeasure.

Figure 21 is figure the problem of showing to produce interference.

Figure 22 is to show to produce the figure of interference due to timing offset.

Embodiment

Hereinafter, embodiments of the present invention are explained with reference to.Fig. 1 is the configuration example for showing wireless communication system Figure.Wireless communication system 1a possesses：Base station (the 1st wireless base station) 10-1, base station (the 2nd wireless base station) 10-2, terminal are (following Referred to as relay station) 20, mobile station 30.

Base station 10-1 sends wireless signal d1.Mobile station 30 is located at the model that can receive the wireless signal that relay station 20 is relayed Enclose.Relay station 20 receive wireless signal d1 carry out relay process (can also send be demodulated, error correction decoding, re-encoding/modulation Wireless signal after the processing such as processing, or it can also be entered in the case where not decoded to the wireless signal received Row amplifies to send.Here, illustrated exemplified by the former), the wireless signal d1 after relay process is sent to mobile station 30.

Here, base station 10-2 is identical in the transmission timing t1 that wireless signal (data A) d1 is sent with being relayed from relay station 20 Timing, using the Radio Resource identical Radio Resource used with relay station 20 in order to send wireless signal (data A) d1, Send wireless signal (data A) d2 (=d1).

For wireless signal d1 and wireless signal d2, identical modulation system can be applied.In addition, transmit power can differ Cause.Here, base station 10-2 can also be substituted, wireless signal (data A) d1 is being sent with being relayed from relay station 20 by base station 10-1 Transmission timing t1 identicals timing, again send identical wireless signal (data A) d1.

Alternatively, it is also possible to wireless using identical in identical timing t 1 by relay station 20, this three of base station 10-1,10-2 Resource sends identical wireless signal (data A).

Pass through such structure, in the period for carrying out relaying transmission from relay station 20 to mobile station 30, mobile station 30 Reception the wireless signal d1 from the transmission of relay station 20 and the wireless signal d2 from base station 10-2 transmissions (or from base station 10-1 again The wireless signal d1 of transmission), but because it is CP length that wireless signal d1, d2, which are identical data (wireless signal), time deviation, Within, so by removing CP, data receiver can be carried out while intersymbol interference is suppressed.

In addition, base station 10-1,10-2, relay station 20 can also carry out following setting in advance to realize while send：For example, According to the signal from epigyny device, frame timing (frame timing) synchronization is realized each other, is carried out respectively in regulation timing It is synchronous to send.

For example, from epigyny device to base station 10-1,10-2, relay station 20 notify to synchronize transmission frame number (with it is fixed When t1 it is corresponding), according to the frame number, use shared Radio Resource to send same data.

The frame number (timing) that should synchronize transmission can also be notified to base station by the scheduler of relay station 20 10-1,10-2 carry out the setting.The notice can perform in the following way：Directly transmitted to base station 10-1 from relaying Stand 20 the wireless signal for including the information related to frame number, base station 10-1 via epigyny device to base station 10-2 forwarding frame compile Number information.Furthermore it is also possible to the wireless communication for including frame number information is directly transmitted from relay station 20 to base station 10-1,10-2 both sides Number, thus perform the notice.

In addition, providing identical data simultaneously to base station 10-1,10-2 respectively from epigyny device, base station 10-2 prolongs transmission Late from base station 10-1 sends data to relay station 20, time delay up to relay station 20 carries out relaying transmission before measure (for example, Measured value, theory setting value etc.), thus, it is possible to carry out data transmission with the timing of the identical of relay station 20.Now, because CP grows The presence of degree and allow some error times, so the timing difference suitable with such error time amount can be considered identical fixed When.

Then, below, 1 application examples as wireless communication system 1a, system architecture during to for MBMS and dynamic Illustrate.First, the overall structure of application wireless communication system 1a MBSFN networks is illustrated.

Fig. 2 is the figure for showing MBSFN networks.MBSFN networks 40 have：MBMS transmission control devices or MBMS control units (below collectively referred to as MBMS control devices) 41 (for example, with MCE (Multi-Cell/Multicast Coordination Entity：Multiple cell/multicast coordination entity) it is corresponding), MBMS data storage device (be to store and manage the device of MBMS data, For example, corresponding with MBMS GW (Gate Way, gateway)) 42, base station (BTS：Base Transceiver Station：Receive base station Send out platform) 43a, 43b, mobile station 30-1~30-4.

MBMS wireless signal includes MBMS data and control signal (following, the also known as MBMS controls for receiving MBMS Signal processed), MBMS control devices 41 control MBMS to send, and MBMS control signals are sent into MBMS data storage device 42, base Stood 43a, 43b, and MBMS data is sent to base station 43a, 43b by MBMS data storage device 42.

MBMS data forms MTCH (the MBMS Traffic Channel as logic channel：MBMS channel), quilt It is mapped to MCH (the Multicast Channel as transmission channel：Multicast Channel), utilize the PMCH as wireless channel (Physical Multicast Channel：Physical Multicast Channel) transmitted wirelessly.

In addition, MBMS control signals form MCCH (the Multicast Control Channel as logic channel：It is more Broadcast control channel), the MCH as transmission channel is mapped to, is transmitted wirelessly using the PMCH as wireless channel.

MBMS control devices 41 carry out resource allocation, MCS (Modulation and Coding Scheme：Modulating-coding Scheme), the scheduling of MBMS data transmission timing etc., and scheduling result is superimposed upon in MBMS control signals and is transmitted.In base Stand in 43a, 43b according to the scheduling result, implement wireless transmission.

In addition, above-mentioned MCS (is also known as AMC (Adaptive Modulation and Coding sometimes：It is adaptive to adjust System and coding)) refer to modulation/coding mode, be change according to radiolink quality adaptation modulation system, encoding rate makes Method, it is made up of attributes such as modulation system, encoding rate and transmitted data amounts (equivalent to transmission speed in result).

For example, carry out setting as follows：If MCS1, then modulation system is QPSK (Quadrature Phase Shift Keying：Orthogonal PSK), encoding rate is 1/8, and transmission speed is 1.891Mb/s, if MCS5, is then modulated Mode is 16QAM (Quadrature Amplitude Modulation：Quadrature amplitude modulation), encoding rate is 1/2, transmission speed Degree is 15.221Mb/s.Generally, optimal MCS is selected according to the reception state of mobile station.

MBMS control devices 41 select 1 MCS from such multiple MCS.As one of MCS system of selection, deposit In following method：On the basis of the cell worst by transmission characteristic (transmission environment), MCS is selected, is all applied in MBSFN regions MCS selected by identical.

If for example, for the worst cell of transmission characteristic, determine to communicate according to MCS1, in MBSFN regions All other cell also apply MCS1 (cell good to transmission characteristic also applies MCS1).Further, it is also possible to set fixation MCS, and independent of transmission environment.

Fig. 3 is the figure for the sequence of movement for showing MBSFN networks.

[S101] MBMS control devices 41 are determined by dispatching MBMS data and its sending method (modulation methods to send Formula, coding method, transmission timing, use wireless frequency etc.).

[S102] MBMS control devices 41 notify identified modulation system, coded system to MBMS data storage device 42 Etc. information and the control signal generated according to these information.Also MBMS data storage device 42 is asked to be passed to base station 43a, 43b Defeated MBMS data.

[S103] receives the MBMS data storage device 42 of notice by control signal (MCCH) and MBMS data (MTCH) It is transferred to base station 43a, 43b.Also, transmission timing to base station 43a, 43b informing MBSFN transmission, use wireless frequency etc. Control information.

[S104] receive base station 43a, 43b of the notice of these control information, MBMS data and control signal according to Control information implements MBSFN transmissions.

[S105] receives DF (the Decode and Forward of MBSFN transmissions：Decoding relaying) relay station is demodulated/ Decoding, implement error correction, carry out coded/modulated again, MBMS data is sent to mobile station.

Then, the wireless communication system 1a in MBSFN networks 40 is illustrated.Fig. 4 shows wireless communication system Figure.Wireless communication system 1a-0 has：MBMS control devices 41, MBMS data storage device 42, base station 43a, 43b, relay station 20th, mobile station 30-1,30-2.Base station 43a is communicated with mobile station 30-1, is led to via relay station 20 and mobile station 30-2 Letter.

Action is illustrated.Relay station 20 receives from base station 43a and sends (base station 43a and base station with MBSFN communication forms The transmission of same MBMS data in 43b synchronization timing) MBMS data, implement demodulation/decoding.

Further, since be MBSFN transmission, so in relay station 20, in addition to the 43a of base station, can also receive from The MBMS data (for example, the MBMS data sent from base station 43b) that a number of other base stations are sent.In addition, will be from base station 43a in MBMS data transmission after station 20 is set to 1MBSFN transmissions.

Relay station 20 is after the MBMS data sent based on 1MBSFN is received, and storage is demodulated/decoding, at error correction MBMS data after reason.Then, after coded modulation is carried out to the MBMS data of interim storage, in the receiving frame relative to MBMS The transmission timing t1 (following, also known as MBSFN relayings transmission timing) postponed, mobile station 30- is sent to by MBMS data 2.Sent in addition, will be sent from relay station 20 to mobile station 30-2 MBMS data be referred to as 2MBSFN here.

Other relay stations (not shown) and base station 43b beyond MBSFN relaying transmission timings, relay station 20 can be carried out MBSFN data are sent, but are not implemented the data beyond MBSFN and sent (for example, the unicast data hair based on unicast communication form Send).

I.e., in the case of figure 4, base station 43b relays transmission timing in MBSFN, carries out the same MBMS numbers based on MBSFN According to transmission, but without the transmission of the unicast data based on unicast communication form etc..

Mobile station 30-2 is received from base station 43b and relay station 20 in the MBMS numbers transmitted by MBSFN relaying transmission timings According to.Thus, in the period that 2MBSFN is sent, the MBMS data that mobile station 30-2 is received is identical data, can Improve transmission characteristic.

Moreover, relaying transmission timing in MBSFN, the mobile station 30-2 based on the 2MBSFN MBMS datas sent is received also Can receive sent again from base station 43a MBMS data (by base station 43a the transmission timing t1 MBMS datas carried out hair again Referred to as 3MBSFN is sent to send).Because 2MBSFN is sent and 3MBSFN transmissions are to send the same MBMS numbers based on MBSFN According to so can be received.

More than so that wireless communication system 1a-0 comes in transmission timing t1 period without using shared Radio Resource Different data are sent, so the generation of interference can be suppressed.

In addition, mobile station 30-2 can receive sending based on MBSFN from multiple base station 43a, 43b and relay station 20 MBMS data, further, it is possible to the MBMS data sent based on multiple MBSFN is received, so multiple data can be received, so as to Enough improve the characteristic of MBSFN transmission.

Then, the configuration example of base station is illustrated.It is assumed that base station 43a, 43b have same structure.Fig. 5 is to show that base station is tied The figure of structure.Base station 43 possesses：Send data buffer 43-1, scheduler 43-2, coded/modulated portion 43-3, control signal generation Portion 43-4, radio section 43-5,43-6, demodulation/lsb decoder 43-7, line quality information collection portion 43-8, connection request signal carry Take portion 43-9, circuit configuration part 43-10, set of terminal configuration part 43-11, RNTI (Radio Network Temporary ID：Nothing The interim ID of gauze network)/set of terminal setting signal generating unit 43-12.

Base station 43 will be sent when receiving transmission data (including MBMS data) from epigyny devices such as MBMS control devices Data Cun Chudao is sent in data buffer 43-1.According to scheduler 43-2 scheduling controlling, from transmission data buffer 43-1 Read and send data, be input to coded/modulated portion 43-3.

Base station 43 receives MBMS control information from the epigyny devices such as MBMS control devices (other base stations), to scheduler 43-2 There is provided send the timing (frame timing etc.) of MBMS data.

In the case of corresponding with Fig. 4 base station 43b in base station 43, sent out for example, MBMS control information can be considered as to instruction The information for sending timing t 1 to be transmitted.In addition, when being transmitted together with base station 43b is sent with base station 43a 1MBSFN, Can the transmission timing comprising the 1MBSFN and transmission timing t1 both sides in MBMS control information.Carrying out MBSFN transmissions when institute By the use of Radio Resource (frequency, modulation system etc.) can set and store as defined Radio Resource in advance, or also may be used With in MBMS control information.

When scheduler 43-2 is judged as needing to send control signal, pass through scheduler 43-2 control, control signal life Control signal is generated into portion 43-4, there is provided gives coded/modulated portion 43-3.

Control signal can for example include the control instruction to relay station, the control to mobile station indicates.Radio section 43-5 will The signal after Error Correction of Coding/modulation treatment is carried out by coded/modulated portion 43-3 and distributes to each subcarrier, passes through IFFT (Inverse FFT, fast fourier inverse transformation) processing etc., ofdm signal is generated, necessary amplification, frequency conversion process etc. are carried out, with wireless The mode of transmission is transmitted from antenna a1.In addition, add CP to sending signal.

On the other hand, the wireless signal (wireless signal from relay station or from mobile station received from antenna a1 Wireless signal) reception processings such as the filtering process of necessary frequency acceptance band, CP removals, FFT processing are carried out by radio section 43-6, by solving Tune/lsb decoder 43-7 is demodulated, decoded.

Including the situation of the quality of reception measurement result related to downstream signal (wireless signal sent from base station 43) Under, it is collected by line quality information collection portion 43-8, there is provided give scheduler 43-2.Therefore, scheduler 43-2 can be according to institute The line quality information of collection, for each mobile station, relay station, its quality of reception state is identified, so can be according to reception Quality, select coded/modulated portion 43-3 should apply encoding rate, modulation system.

In addition, in the case where mobile station, relay station etc. have sent connection request signal, connection request signal extraction unit 43-9 extracts the connection request signal from reception signal, there is provided gives circuit configuration part 43-10.Set of terminal configuration part 43-11 pins Mobile station, relay station to subordinate, are grouped (grouping).Circuit configuration part 43-10 is according to connection request signal with dividing The content of group carries out circuit setting, and circuit setting information is sent into RNTI/ set of terminal setting signal generating units 43-12. For the different RNTI of every group of imparting, the setting for carrying out set of terminal controls RNTI/ set of terminal setting signal generating units 43-12, will Its group information is with sending data investigation.In addition, the detailed content of packet is described later.

Then, the configuration example of relay station 20 is illustrated.Fig. 6, Fig. 7 are the figures for the structure for showing relay station 20.Relaying Stand and 20 possess：Antenna a2, a3, receive radio section 22a-1,22b-1, demodulation/lsb decoder 22a-2,22b-2, line quality information Collection portion 23a, MBMS control signal extraction unit 23b-2, downgoing control signal generating unit 23b-3, scheduler 24a, transmission data Buffer 24b, circuit configuration part 25a, up connection request signal extraction unit 26a-1, up connection request signal generating unit 26a-2, up transmission control signal generating unit 26a-3, line quality determination part 27a-1, line quality information generating unit 27a- 2nd, coded/modulated portion 25b-1,28a-1, transmission radio section 25b-2,28a-2, set of terminal configuration part 201, RNTI/ set of terminal are set Determine signal generation portion 202.

In relay station 20, extracted and received by reception radio section 22b-1 from the signal that base station 43 receives via antenna a2 The signal of the frequency band of object, and implement CP removals, FFT processing, demodulation/decoding process is performed by demodulation/lsb decoder 22b-2.

Decoded signal (including MBMS data), which is input to, sends data buffer 24b, according to scheduler 24a tune Degree, read from data buffer 24b is sent, be input to coded/modulated portion 25b-1.

In the case of containing MBMS control signals in reception signal, MBMS control signal extraction units 23b-2 extractions MBMS Control signal, there is provided give scheduler 24a.Therefore, scheduler 24a is in the timing (t1) specified by MBMS control signals, transmission MBMS data.

When carrying out MBSFN transmissions by the use of Radio Resource (frequency, modulation system etc.) can in advance be used as defined in nothing Line resource settings simultaneously store, or can also reside in MBMS control information.Believe in MBMS control signals comprising Radio Resource In the case of breath, scheduler 24a carries out MBSFN transmissions (transmission of MBMS data) using specified Radio Resource.

In addition, in the case where presence should be sent to the control signal of mobile station, the descending control letter of scheduler 24a controls Number generating unit 23b-3, its is set to generate control signal.Therefore, coded/modulated portion 25b-1 is carried out to control signal, MBMS data etc. Coded/modulated, it is delivered to and sends radio section 25b-2, sends radio section 25b-2 and implement to send required amplification as wireless signal Deng wireless processing, wireless signal is sent from antenna a3.

In addition, relay station 20 inputs the wireless signal received via antenna a3 to reception radio section 22a-1.Receive nothing 22a-1 extractions in line portion receive the signal of the frequency band of object, and reception signal is input into demodulation/lsb decoder 22a-2.By demodulation/solution Code portion 22a-2 demodulation, decoded signal are input into coded/modulated portion 28a-1 under scheduler 24a control, by reality After applying coded/modulated processing etc., the processing such as IFFT processing, CP insertions are carried out by transmission radio section 28a-2, as ofdm signal Base station is sent to from antenna a2 relayings.

In addition, in the case of including line quality information in by demodulation/decoded data of lsb decoder 22a-2, circuit Quality information is input into line quality information collection portion 23a, is used for scheduler 24a Adaptive Modulation control.In addition, In the case of comprising up connection request signal, up connection request signal is entered by up connection request signal extraction unit 26a-1 Row extraction, is provided to circuit configuration part 25a.In order to notify the presence of up connection request to base station, by up connection request The up connection request signal that signal generation portion 26a-2 is generated is supplied to coded/modulated portion 28a-1.

Also, in the case where needing to send control signal, from scheduler 24a to up transmission control signal generating unit 26a-3 is indicated that the control signal generated is supplied to coded/modulated portion by up transmission control signal generating unit 26a-3 28a-1 is transmitted.

Also, exported by the line quality determination part 27a-1 of the signal measuring line quality for being received from base station Measurement result be input to line quality information generating unit 27a-2, be transfused to as line quality information and be sent to coding/ Modulation portion 28a-1.In addition, in relay station 20, when carrying out the setting of set of terminal, for up direction, will be set by set of terminal The group information for determining the setting of portion 201 is superimposed via circuit configuration part 25a with up connection request signal.In addition, RNTI/ set of terminal is set Signal generation portion 202 is determined for the different RNTI of every group of imparting, the setting control of set of terminal is carried out, by its group information with sending number According to superposition.

Then, the configuration example of mobile station is illustrated.Fig. 8 is the figure for the structure for showing mobile station.Mobile station 30 possesses： Antenna a4, radio section 31-1,31-2, demodulation/lsb decoder 32-1, coded/modulated portion 32-2, line quality measure/calculating part 33- 1st, control signal extraction unit 33-2, receiving power determination part 33-3, line quality sending part 34, terminal profile control unit 35, line Road connection control unit 36, connection request signal generating unit 37, set of terminal set information extraction unit 38.

In mobile station 30, the signal received via antenna a4 from relay station or base station is inputted to radio section 31-1, Extraction receives the frequency band of object, implements CP removals, FFT processing, inputs to demodulation/lsb decoder 32-1.In transmission timing t1, base station 43b (also having base station 43a) sends identical MBMS data simultaneously with relay station, so radio section 31-1 receives these MBMS datas Signal, as long as receiving these MBMS datas in the case of being below CP length in timing offset, it becomes possible to removed by CP, to press down Intersymbol interference processed.

Demodulation, decoded signal be input to line quality measure/calculating part 33-1, control signal extraction unit 33-2, Receiving power determination part 33-3, set of terminal set information extraction unit 38.Receive data and be input to data processing division (not shown). Line quality measure/calculating part 33-1 determines CINR (the Carrier to Interference and on reception signal Noise Ratio：Carrier wave and interference-to-noise ratio) etc. wireless quality, measurement result is supplied to line quality sending part 34, makes it Sent the measurement result as line quality information to relay station or base station.In addition, line quality information can be should be right Used in the Adaptive Modulation control of down direction signal application.

In the case where including control signal in receiving data, control signal extraction unit 33-2 extracts the control signal, carries Supply terminal profile control unit 35.Terminal profile control unit 35 carries out reception system, sends system according to the control signal received Radio section 31-1,31-2 of system control, demodulation and the control of lsb decoder.As the control letter from base station, relay station transmission Number example, such as can enumerate for data send wireless resource information, be adaptive to transmission encoding rate, modulation system Deng.

The known signal that receiving power determination part 33-3 is for example determined from base station, relay station transmission is (pilot signal, leading (preamble) signal etc.) receiving power, identify the presence of base station and relay station, notify to determine to line connection control portion 36 As a result.Line connection control portion 36 indicated to connection request signal generating unit 37, with the base station asking and detect or in Connected after station.

Connection request signal generating unit 37 generates connection request signal, makes the connection request signal for base station or relay station It is transmitted.For example, mobile station 30 receive base station 43a MBSFN send (MBMS data) in the state of, in detecting When station, send for the connection request signal of relay station to make requests on, so as to receive MBMS data from relay station.Eventually The extraction of end group set information extraction unit 38 is included in the group information in reception signal, identifies the group identifier of mobile station 30.

On the other hand, the processing as the system of transmission, by the data from data processing division (not shown), from circuit matter Line quality information, the connection request signal from connection request signal generating unit 37 of amount sending part 34 are inputted to coding/tune Portion 32-2 processed, coded/modulated processing is carried out, sent via radio section 31-2 from antenna a4.In addition, the transmission of up direction may be used also With according to SC-FDMA (Single Carrier Frequency Division Multiple Access：Single carrier frequency division is more Location) mode is transmitted to be transmitted, rather than according to OFDM modes.

Then, illustrate to be grouped to carry out the wireless system of radio communication.Fig. 9 is the structure for showing wireless communication system Figure.The wireless communication system 1a-1 of 1st embodiment has base station 43a, 43b, relay station 20, mobile station 30-1~30-6 (in addition, afterwards in shown system construction drawing, eliminate MBMS control devices 41, the figure of MBMS data storage device 42 Show).

Base station 43b, relay station 20 and mobile station 30-1~30-6 are located in base station 43a cell 4a, mobile station 30-4 ~30-6 is located in the relay area 2a of relay station 20.In base station 43b service range comprising mobile station 30-4~30-6 ( The structure that base station 43b is included in cell 4a is shown in figure, but base station 43b can be not included in cell 4a, as long as mobile station 30-4~30-6 is contained in base station 43b service range).

In addition, relay station 20 and mobile station 30-1~30-3 are set to a group g1 by base station 43a, mobile station 30-4~30-6 is drawn It is divided into a group g2.From base station 43a to group g1 transmission equivalent to 1MBSFN send, from relay station 20 to group g2 transmission equivalent to 2MBSFN is sent.

Here, base station 43a implements MBSFN transmissions to group g1 (MBMS data based on MBSFN communication forms is sent).Receive Relay station 20 to the transmission for example implements demodulation/decoding and coded/modulated this series of relay process, and group g2 is implemented MBSFN relaying is sent.

In the 43b of base station, according to the transmission timing t1 that transmission MBMS data is relayed from relay station 20, sent to group g2 MBSFN MBMS data.Moreover, the transmission timing t1 that base station 43a sends MBMS data according to being relayed from relay station 20, with MBSFN form sends MBMS data (the 3MBSFN hairs of content identical with the MBMS data being previously sent to group g2 again Send).That is, in transmission timing t1, MBMS data is sent from relay station 20 and base station 43a, 43b.Mobile station 30-4 in group g2 ~30-6 receives the MBMS data sent from relay station 20 and base station 43a, 43b.

Figure 10 is the figure for the sequence of movement for showing wireless communication system 1a-1.

[S1] base station 43a and base station 43b sends the MBMS data based on MBSFN communication forms to group g1.

[S2] relay station 20 when receiving MBMS data, such as be demodulated/decode and coded/modulated this is a series of Relay process.

[S3a] relay station 20 sends the MBMS data based on MBSFN communication forms in transmission timing t1, to group g2.

[S3b] base station 43b is sending the identical transmission timing t1 of MBMS data from relay station 20, sends and is led to based on MBSFN The MBMS data of letter form.

[S3c] base station 43a is sending the identical transmission timing t1 of MBMS data from relay station 20, sends be based on again The MBMS data of MBSFN communication forms.

As described above, according to wireless communication system 1a-1, same timing (transmission timing t1) carry out from relay station 20 to Group g2 MBSFN is sent and the MBSFN from base station 43a, 43b is sent.Thus, phase is sent in transmission timing t1 period Same MBMS data, so can suppress to deteriorate transmission quality due to sending different data using shared Radio Resource Situation.

Further, since in the MBSFN sent and from base station 43a, 43b is relayed from the MBSFN of relay station 20 and is sent, Identical MBMS data is sent in identical timing, so mobile station 30-4~30-6 in group g2 can be received simultaneously to both Synthesis, so as to improve transmission characteristic.

Then, the wireless communication system of the 2nd embodiment is illustrated.Figure 11 is the structure for showing wireless communication system Figure.The wireless communication system 1a-2 of 2nd embodiment has：Base station 43a, 43b, relay station 20-1, mobile station 30-1~30- 6, basic system architecture is identical with Fig. 9, but relay station 20-1 includes communication form transformation component 20a.

Base station 43a sends MBMS in the 1st data are sent using the 1st communication form (for example, unicast communication form) Data, in the 2nd data send (3MBSFN transmissions), MBMS numbers are sent using the 2nd communication form (for example, MBSFN) According to.

Here, base station 43a implements the MBMS data transmission based on unicast communication form to group g1.Receive in the transmission After station, 20-1 is demodulated/decoded, and carries out the conversion of communication form, the MBMS data based on unicast communication form is transformed to MBSFN communication forms, generate MBSFN MBMS data.

Then, the MBMS data after encoded/modulation, communication form conversion is sent to group g2, to implement MBSFN hairs Send.In addition, from unicasting in MBSFN conversion, standard CP is replaced into extension CP, PDSCH wireless channel is transformed to (conversion (CP displacement) of this communication form is for example using the transmission radio section 25b-2 shown in Fig. 7 for PMCH wireless channel To perform).

On the other hand, the transmission timing t1 that base station 43b sends MBMS data according to being relayed from relay station 20-1, sent out to group g2 Send the MBMS data based on MBSFN communication forms.

Then, the transmission timing t1 that base station 43a sends MBMS data according to being relayed from relay station 20-1, specifically sent out to group g2 The MBMS data based on MBSFN communication forms is sent (that is, in transmission timing t1, to be sent from relay station 20-1 and base station 43a, 43b MBMS data based on MBSFN).Mobile station 30-4~30-6 in group g2 receives to be sent out from relay station 20-1 and base station 43a, 43b The MBMS data sent.

Figure 12 is the figure for the sequence of movement for showing wireless communication system 1a-2.

[S11] base station 43a sends the MBMS data based on unicast communication form to group g1.

[S12] relay station 20-1 is when receiving MBMS data, by the communication form that unicast communication formal argument is MBSFN (in addition, be also demodulated/decode and coded/modulated this series of relay process).

[S13a] relay station 20-1 sends the MBMS data based on MBSFN communication forms in transmission timing t1 to group g2.

[S13b] base station 43b is sending the identical transmission timing t1 of MBMS data from relay station 20-1, sends and is based on MBSFN The MBMS data of communication form.

[S13c] base station 43a is sending the identical transmission timing t1 of MBMS data from relay station 20-1, sends be based on again The MBMS data of MBSFN communication forms.

As described above, according to wireless communication system 1a-2, base station 43a sends MBMS data in the form of unicast communication, relaying Unicast communication formal argument is MBSFN by the 20-1 that stands, and relaying sends MBMS data in the form of MBSFN.In addition, enter in same timing Row is sent from relay station 20-1 to group g2 MBSFN and the MBSFN from base station 43a, 43b is sent.

Thereby, it is possible to improve transmission quality without producing interference in group g2.Further, since from relay station 20-1 MBSFN relayings send and MBSFN from base station 43a, 43b send in send identical MBMS data, so in group g2 Mobile station 30-4~30-6 can be received and synthesized to both, so as to improve transmission characteristic.

Then, the wireless communication system of the 3rd embodiment is illustrated.Figure 13 is the structure for showing wireless communication system Figure.The wireless communication system 1a-3 of 3rd embodiment has base station 43a, 43b, relay station 20, mobile station 30-1~30-6, Basic system architecture is identical with Fig. 9, but difference is to be grouped.

Base station 43b, relay station 20 and mobile station 30-1~30-6 are located in base station 43a cell 4a, mobile station 30-4 ~30-6 is located in the relay area 2a of relay station 20.In addition, base station 43a is divided into the group of progress MBSFN receptions and via relaying Stand 20 carry out MBSFN receptions group.

In the case of fig. 13, the group for carrying out MBSFN receptions is relay station 20 and mobile station 30-1~30-6, thus by it Be set to a group g1.In addition, it is mobile station 30-4~30-6 via the group of the progress MBSFN receptions of relay station 20, so they are set For a group g2.

Here, base station 43a implements MBSFN transmissions to group g1.The relay station 20 for receiving the transmission for example implements demodulation/solution Code and coded/modulated this series of relay process, a MBSFN transmissions are implemented to group g2.

In addition, the transmission timing t1 that base station 43b sends MBMS data according to being relayed from relay station 20, implements to group g2 MBSFN is sent.It is real again to group g1 also, base station 43a sends the transmission timing t1 of MBMS data according to being relayed from relay station 20 Apply MBSFN transmissions.Thus, because the mobile station 30-4~30-6 for belonging to group g2 still belongs to a group g1, so can enter from base station 43a MBSFN is received row twice.

Figure 14 is the figure for the sequence of movement for showing wireless communication system 1a-3.

[S21a] base station 43a and base station 43b sends the MBMS data based on MBSFN communication forms, MBMS numbers to group g1 According to the relay station 20 in arrival group g1.

The mobile station in the MBMS data arrival group g1 based on MBSFN communication forms that [S21b] is sent in step S21a 30-1~30-6.

[S22] relay station 20 when receiving MBMS data, such as be demodulated/decode and coded/modulated this be The relay process of row.

[S23a] relay station 20 is sent to a group g2 (mobile station 30-4~30-6) and communicated based on MBSFN in transmission timing t1 The MBMS data of form.

[S23b] base station 43b is sending the identical transmission timing t1 of MBMS data from relay station 20, sends and is based on to group g2 The MBMS data of MBSFN communication forms.

[S23c] base station 43a is sending the identical transmission timing t1 of MBMS data from relay station 20, is sent again to group g1 MBMS data based on MBSFN communication forms.Because mobile station 30-4~30-6 is in group g1, g2 both sides, so can be from Base station 43a receives MBMS data twice, it is possible to increase time diversity effect.

As described above, according to wireless communication system 1a-3, the group g1 of progress MBSFN receptions is divided into and via relay station 20 carry out MBSFN receptions group g2, same timing carry out from relay station 20 to group g2 MBSFN send and from base station 43a, 43b MBSFN is sent.

Thereby, it is possible to improve transmission quality in group g2.In addition, transmission timing is relayed in the MBSFN from relay station 20, Base station 43a carries out MBSFN transmissions again to group g1, so the mobile station 30-4~30-6 jointly comprised in group g1, g2 can be right Both are synthesized, so as to realize the raising of transmission characteristic.

Then, the establishing method of group is illustrated.As group technology, such as suitable for LTE system or LTE- In the case of Advanced systems, according to whether receiving MBSFN via relay station and assigning different RNTI, thus implement to divide Group.In addition, RNTI and group information are notified to mobile station as control signal, the mobile station of notice is received according to affiliated Group carries out MBSFN receptions.

Implement packet in relay station, base station or MBMS control devices 41, the identification id of affiliated group and group information are led to Know to each mobile station.In addition, the management of these information is also what is implemented in relay station, base station or MBMS control devices.

Hereinafter, by taking Fig. 9 structure as an example, illustrated to carrying out a group situation for setting by base station 43a.Base station 43a is in In radiolink setting when station 20 is set, if receiving the connection request from relay station 20, identify and confirm base The relay station 20 stood in 43a cell 4a.Equally, identify and confirm mobile station 30-1~30-3 in base station 43a cell 4a. Identification id (such as RNTI) is assigned to these relay stations 20 and mobile station 30-1~30-3 identified, is set using RNTI Group g1.

In addition, base station 43a is when receiving the connection request via relay station 20, the relaying of identification/confirmation relay station 20 Mobile station 30-4~30-6 in the 2a of region, assign the RNTI in the 2a of relay area.Also, for via relay station 20 and base station Mobile station 30-4~30-6 setting groups g2 that 43a is communicated.

Which RNTI to belong to which group is managed in the 43a of base station.In the case, due to via relay station 20 The RNTI that mobile station 30-4~30-6 for being communicated with base station 43a is assigned also is notified to relay station 20, therefore can also be by The setting group g2 of relay station 20, relay station 20 notify setting result to base station 43a.In addition, belong to multiple groups of situation in mobile station Under, notify the number of the group belonging to corresponding mobile station to corresponding mobile station and the situation of identical data can be received.

In the above description, base station 43a cell 4a and the relay station 20 in the cell 4a cell (relay area Domain) 2a is identical cell ID, but the cell ID for also contemplating for the base station 43a cell 4a and cell 2a of relay station 20 it is different and Implement the situation of circuit control respectively.

In this case, relay station 20 assigns RNTI to the mobile station for receiving connection request.Relay station 20 is to base The 43a that stands notifies assigned RNTI.The base station 43a for receiving notice is directed to what is communicated via relay station 20 with base station 43a Mobile station setting group, implement management.

Even if in addition, it is additionally contemplates that above in mobile station 30-4~30-6 of MBSFN receptions is carried out by relay station 20 The possibility for sufficiently receiving characteristic can not also be obtained by receiving the MBMS data sent from base station 43a in the form of MBSFN.

But due to also contemplating situation about can receive from the base station 43a MBMS datas sent in the form of MBSFN, institute So that in this case, as the 3rd embodiment, corresponding mobile station (for example, mobile station 30-4~30-6) can belong to group G2 and still belong to a group g1.

In the case, multiple groups of situation is belonged to mobile station 30-4~30-6 notices.Base station 43a is except utilizing Outside 1MBSFN is sent, also sent using 3MBSFN and send same MBSFN data, thus mobile station 30-4~30-6 can 1 MBSFN data is repeatedly received.Situation about can repeatedly be received means implementation time diversity reception, so Reception characteristic can be improved.

Situation about being set by base station implementation group is illustrated above, but can also be carried out in MBMS control devices 41 Implement, group information etc. is notified to base station, relay station and mobile station.

Then, as the 1st variation, illustrate to carry out communication form conversion according to the quantity of the mobile station of the subordinate of relay station 20 Wireless communication system.Figure 15 is the figure for the structure for showing wireless communication system.Wireless communication system 1b possesses：Base station 43a, in After station 20-2, mobile station 3.

Base station 43a sends the wireless signal d1 with the 1st communication form.Relay station 20-2 includes communication form transformation component The number of units of the mobile station 3 of 20a and monitoring unit 20b, monitoring unit 20b monitoring relay station 20-2 subordinate.In addition, communication form transformation component 20a converts the 1st communication form, relayed according to monitoring result.

Here, monitoring unit 20b is when confirming the quantity of mobile station 3 of subordinate and being less than threshold value, to communication form transformation component 20a notifies the situation.Then, the 1st communication form is transformed to other 2nd communication forms by communication form transformation component 20a, with the 2 communication forms carry out relaying wireless signals (wireless signal d1a).

As one, the 1st communication form is set to MBSFN, the 2nd communication form is set to unicast.MBSFN is based on when receiving The quantity of mobile station 3 of MBMS data when being less than threshold value, received MBMS data (is had MBSFN by relay station 20-2 Communication form) it is transformed to unicast communication form, MBMS data is relayed with unicast fashion.

When the quantity of the mobile station 3 of subordinate is less than threshold value, it is meant that carry out MBSFN receptions mobile station 3 quantity compared with It is few, so if sending MBMS data (transmission is attached with standard CP MBMS data) in the form of unicast communication, then need not Carry out multiple MBSFN to send, Radio Resource can be effectively utilized.

Then.As the 2nd variation, illustrate to send different content in 1MBSFN sends and sent with 3MBSFN The wireless communication system of MBMS data.Figure 16 is the figure for the structure for showing wireless communication system.Wireless communication system 1c possesses：Base Stand 43a, 43b, relay station 20, mobile station 30-1~30-6.

Base station 43b, relay station 20 and mobile station 30-1~30-6 are located in base station 43a cell 4a, mobile station 30-4 ~30-6 is located in the relay area 2a of relay station 20.In addition, relay station 20 and mobile station 30-1~30-3 are set to by base station 43a Group g1, a group g2 is set to by mobile station 30-4~30-6.

In above-mentioned Fig. 9, it is set as also sending the MBMS of content identical with 1MBSFN transmissions in 3MBSFN is sent Data, but in wireless communication system 1c, send the MBMS data of different content.

MBMS data is applied with different scrambler (scrambling code) according to each MBSFN, so different In the case that MBSFN is sent, it can be identified.Moreover, because being applied with different scramblers according to each sending time slots, The different MBSFN data of transmission timing can be identified.Therefore, even if 1MBSFN sends the MBMS data sent with 3MBSFN Content it is different, can also identify.

Here, base station 43a implements MBSFN transmissions (transmission of the MBMS data D1 based on MBSFN communication forms) to group g1. The relay station 20 for receiving the transmission for example implements demodulation/decoding and coded/modulated this series of relay process, to a group g2 Implement MBSFN transmissions.

In addition, the transmission timing t1 that base station 43b sends MBMS data D1 according to being relayed from relay station 20, in the form of MBSFN MBMS data D1 is sent to group g2.

Moreover, the transmission timing t1 that base station 43a sends MBMS data D1 according to being relayed from relay station 20, in the form of MBSFN The MBMS data D2 of the content different to the content for the MBMS data D1 that group g2 is sent from last time sends.

Mobile station 30-4~30-6 in group g2 receive the MBMS data D1 that is sent from base station 43b and relay station 20 and from The MBMS data D2 that base station 43a is sent.It can be also identified by such structure.

Then, the 3rd variation is illustrated.For example, it is to be sent using 1MBSFN and the in the 1st embodiment 2MBSFN sends and is carried out, but is handled in this variation respectively as different MBSFN regions.That is, by 1MBSFN is sent and is used as 1MBSFN regions, and 2MBSFN is sent as 2MBSFN regions.Thus, it is real in respective send The scrambler applied is different.Thereby, it is possible to obtain effect in a same manner as in the first embodiment.In addition, on MBSFN regions, in advance from base Stand and relay station notifies, to mobile station, to generate scrambler corresponding with the MBSFN zone numbers notified, release and add when receiving Disturb, thus, it is possible to be received.

The principle of the present invention is simply shown above.Also, a variety of changes to those skilled in the art, can be carried out Shape, change, the invention is not restricted to the above-mentioned precise structure for showing and illustrating and application examples, corresponding all deformed example and wait Jljl is considered as the scope of the present invention for belonging to appended claims and its equivalent is limited.

Label declaration

1a wireless communication systems

10-1,10-2 base station

20 relay stations

30 mobile stations

D1, d2 wireless signal

Claims (2)

1. A kind of 1. wireless communication system, it is characterised in that

   The wireless communication system has：

   Wireless base station, it sends the wireless signal with the 1st form, and the 1st form includes the 1st cyclic prefix portion；And

   Relay station, it includes the monitoring unit of the quantity of the mobile station of monitoring subordinate and converts the 1st form according to monitoring result The transformation component relayed,

   When the quantity that the monitoring unit confirms the mobile station is less than threshold value, the transformation component is by the 1st format conversion For the 2nd form, the wireless signal is relayed with the 2nd form, the 2nd form includes institute of the length than the 1st form State the 2nd short cyclic prefix portion of the length of the 1st cyclic prefix portion.
2. 2. a kind of wireless communications method, is performed by wireless communication system, it is characterised in that the wireless communication system has：

   Wireless base station, it sends the wireless signal with the 1st form, and the 1st form includes the 1st cyclic prefix portion；And

   Relay station, it includes the monitoring unit of the quantity of the mobile station of monitoring subordinate and converts the 1st form according to monitoring result The transformation component relayed,

   When the quantity that the monitoring unit confirms the mobile station is less than threshold value, the transformation component is by the 1st format conversion For the 2nd form, the wireless signal is relayed with the 2nd form, the 2nd form includes institute of the length than the 1st form State the 2nd short cyclic prefix portion of the length of the 1st cyclic prefix portion.