Radio communication system.

(54) Title: RADIOCOMMUNICATION SYSTEM. (54) Title: RADIO COMMUNICATION SYSTEM.

(57) Summary

Interference is prevented and the quality of radio transmission is improved; a radio station (1st) performs communication by using a radio signal (d1); a radio station (2r) receives a radio signal (2d) that is indistinguishable from the radio signal (d1); a radio station (3r) is in a radio communication area of ​​the radio station (1 r) and a radio communication area of ​​the radio station (2r); a frame format conversion unit (21) generates a radio signal (d2a) by converting a frame format of the radio signal (d2) to a frame format that is distinguishable from the radio signal (d1), and communicates with the radio station (3r) by using the radio signal (d2a).

(57) Abstract

The occurrence of interference is suppressed to improve the quality of radio transmission. A radio station (1r) performs the communication of a radio signal (d1). A radio station (2r) receives a radio signal (d2) which cannot be discriminated from the radio signal (d 1). A radio station (3r) is located in the radio communication range of the radio station (1 r) and in the Service area of ​​the radio station (2r). A communication method converting section (21) generates a radio signal (d2a) which is obtained by converting the communication method of the radio signal (d2) into a communication method which can be discriminated from the radio signal (d1) to perform communication with the radio station (3r) by the radio signal (d2a).

Institute

Mexican Property

Industrial _SE_ «CBÍTAÍIÍA OS TOHÓMÍA

<img file="MX336207B_D0001.tif" />

<img file="MX336207B_D0002.tif" />

PATENT TITLE NO. 336207

Owner (s): FUJITSU LIMITED

Address: 1-1. Kamikodanaka 4-chome, Nakahara-ku, 211-8588, Kawasaki-sh¡, Kanagawa,

JAPAN

Name: RADIOCOMMUNICATION SYSTEM.

Classification: lntCI.8: H04W16 / 14

<img file="MX336207B_D0003.tif" />

pacha do Vencí a ¿Manto da rafaranoe «¡grant coi •« mtormidad with Marti ilo23de tufen subscribe the preaem Ihcfóstrial property (Daily

8/01/2004, 18/06/2005, &lt;01/2006, ^/05/2009,06/01/2010, 18/08/2010,

07/01/2002, 07/15/2004, 07/28/2004 and 09/07/2007); articles1 ^ 3 ^ 4 ° 5 'section V paragraph ^), 16 sections I and III and 30 of the Organic Statute of the Mexican Institute of Industrial Property (DOF 12/27/1999, amended on 10/10/2002, 07/29/2004, 08/04/2004 and 09/13/2007); 1, 3 and 5 subsection a) of the Agreement that delegates powers to the Deputy Directors General, Coordinator, Divisional Directors, Holders of the Regional Offices, Divisional Deputy Directors, Departmental Coordinators and other subordinates of the Mexican Institute of Industrial Property. (DOF 12/15/1999, amended on 02/04/2000, 07/29/2004, 08/04/2004 and 09/13/2007).

<img file="MX336207B_D0004.tif" />

Not Arenal. 550, Floor 1,

Coi. Pueblo Santa María Tepepan, Xochtroílco Delegation,

CP 16020, Mexico, D F.

Tea!. (55) 53 34 07 00 www.iropi qob.rox

Issue Date: January 11, 2016

THE DIVISIONAL DIRECTOR OF PATENTS

<img file="MX336207B_D0005.tif" />

NAHANNY CANAL REYES

<img file="MX336207B_D0006.tif" />

MX / 2016/2611

<img file="MX336207B_D0007.tif" />

to. .-. r '··. &lt;

RADIOCOMMUNICATION SYSTEM

<img file="MX336207B_D0008.tif" />

iridusírtat

TECHNICAL FIELD

The modalities discussed herein relate to radio communication systems including a mobile telecommunication system, a radio LAN (Local Area Network), and the like.

BACKGROUND OF THE INVENTION

In recent years a new high-speed communication service referred to as LTE (Long Term Evolution) has been expected as a standard for communication via such a mobile station with a portable telephone. In addition, an advanced LTE system that is a later developed version of the LTE is analyzed in 3GPP (Third Generation Partnership Project).

Furthermore, the advanced LTE system will be proposed as an advanced IMT system which is a further developed version of an IMT 2000 (International Mobile Telecommunication) system whose ITU-R (International Telecommunication Union Radio Communications Sector) determines to analyze.

W-CDMA (Broadband Code Division Multiple Access), one CDMA, and WiMax (Microwave Access for Interoperation to

<img file="MX336207B_D0009.tif" />

World Level), are typical IMT-2000 systems.

muto

OTcano you © Fa Fropíected

With an advanced LTE system that introduces an MBSFN (Intimate Network

Simple Frequency of Multimedia Broadcast Multldiffusion Service) in which the MBMS data is transmitted.

Multimedia Broadcast) and a relay apparatus (relay node) to perform radio relay with an LTE system as the basis is discussed (uplink / downlink bandwidth expansion is also discussed, MIMO uplink introduction (inputs multiple multiple outputs), and the like). Now we will give the description of a system

Advanced LTE as an example.

(1) MBMS and MBSFN

An MBMS is a service for the dissemination of data to non-specific or specific users. To be specific, it is possible to disseminate information such as news or multicast information to specific users.

Furthermore, an MBSFN in which a plurality of base stations transmit MBMS data in synchronization with each other using the same resource, is analyzed as a method for transmitting broadcast data (MBMS data) using an MBMS .

"SFN" (Simple Frequency Network) of "MBSFN" means using the same radio frequency. That is, a transmission area is usually established (they are MBSFN) in an MBSFN and the same radio frequency is used in

<img file="MX336207B_D0010.tif" />

that area (see TS36.300V8.6.0 15 MBMS).

to póOptitude

Furthermore, with an MBSFN a plurality of Indian base stations transmit the same data on the same frequency at the same time. As a result, a mobile station can receive MBMS data transmitted from the plurality of base stations.

The reason for this is as follows. If the delay time is shorter than or equal to the length of a CP (Cyclic Prefix) in, for example, OFDM (Orthogonal Frequency Division Multiplexing), then pieces of plural data can be received and synthesized. By receiving and synthesizing plural pieces of data, the effect of improving a reception characteristic can be obtained.

A CP is a redundant portion added at the time of data transmission to prevent data overlap, and corresponds to a Gl (Guard Interval) in terrestrial digital broadcasting. The length of a

CP used in an MBSFN is longer than that of a CP added to unicast data in normal communication.

FIG. 20 illustrates the format of the radio data. Radio data includes a CP and data. A CP used at a time in the unicast transmission is referred to as a normal CP and a CP used in an MBSFN is referred to as an extended CP. The length of a normal CP is 4.69 psec and the length of a CP used in an MBSFN (length of a CP included in MBMS data) is 16.67 psec.

FIG. 21 illustrate receiving and combining data. It is assumed

<img file="MX336207B_D0011.tif" />

that a mobile station 120 receives MBMS data (data b) transmitted from a base station B and that mobile station 120 receives MBMS data (data a) transmitted at a time t from a base station A after receiving the data b ( data a and b are disseminated data and are the same in the content of the service).

If the delay time t falls within the range of the length of a CP from the time when mobile station 120 begins to receive data b, then mobile station 120 can receive not only data b but also data a and combine the data a and b. As described earlier, a

CP is long in an MBSFN. Therefore, a mobile station can also receive MBMS data transmitted from a remote base station (corresponding to base station A in this example) and can perform the combination.

(2) Relay apparatus (relay node)

With an advanced LTE system, a relay node is installed between a base station and a mobile station, for example, for cell extension or as countermeasures for dead spots.

FIG. 22 illustrates the spread of cells. A mobile station 120 is outside of a cell 100a of a base station 100. A relay node 110 is installed inside cell 100a. Mobile station 120 is within a relay area 110a in which relay node 110 can perform the relay.

<img file="MX336207B_D0012.tif" />

If a relay node such as relay node 110 does not exist twfg s mobile station 120 is external to cell 100a and cannot communicate with *ⁿdusfrtot base station 100. However, if relay node 110 is installed, mobile station 120 is within relay area 110. Even if mobile station 120 is external to cell 110a, radio relay is performed via relay node 110 and communication can take place between base station 100 and mobile station 120.

FIG. 23 illustrates countermeasures for a standstill. A relay node 110 is installed within a cell 100a of a base station 100. A deadlock 110b exists within cell 100a. A mobile station 120 is at neutral 110b. A relief area 110a of relay node 110 is assumed to cover dead center 110b.

If a relay node such as relay node 110 does not exist and mobile station 120 is at neutral 110b, it is difficult for mobile station 120 to communicate with base station 100. However, if relay node 110 is installed and relay area 110a of relay node 110 covers dead center 110b, then radio relay is performed via relay node 110 and communication can be performed between base station 100 and mobile station 120 at dead point 110b.

The following technique was proposed in Patent Document 1 as a conventional technique related to MBMS. A mobile station estimates the quality of the cell based on the difference in transmit power between a common pilot channel and a common control channel and receives

<img file="MX336207B_D0013.tif" />

data from an adjacent cell in which the quality of the cell is the most

Furthermore, the following technique is proposed in patent document 2 as a conventional radio relief technique. A transmitting apparatus ranks and transmits a relay apparatus signal which retransmits a relay apparatus and a transmitting apparatus signal transmitted directly to a receiving apparatus. The relay apparatus demodulates the signal from the relay apparatus, modulates it again, and retransmits it.

Patent Document 1: Japanese Patent Publication Open to the Public No. 2008-503130 (Paragraphs [0015] - [0020], FIG. 1).

Patent Document 2: Japanese Patent Publication Open to the Public No. 10-032557 (Paragraphs [0019] - [0021], FIG. 1).

BRIEF DESCRIPTION OF THE INVENTION

Problem to be solved by the invention

With an MBMS radio network, as described above, a relay node can be installed to perform cell extension or take countermeasures for a deadlock. Furthermore, with an MBSFN a radio signal is transmitted through the use of an extended CP which is longer than a normal CP used for normal unicast transmission. Consequently, a radio signal transmitted from a remote base station from a mobile station can be received via a relay node. As a result, the possibility of receiving and combining more can be improved

<img file="MX336207B_D0014.tif" />

pieces of data.

However, with a conventional MBMS radio network, there is the Endusí / icst problem of not being able to distinguish between the unicast data and the MBMS data transmitted in an MBSFN.

FIG. 24 illustrates the problem of not being able to distinguish between unicast data and MBMS data. There are base stations 101 to 103, mobile stations 121 to 123, and a relay node 110. The base station

101 transmits unicast data r1 to mobile station 121. Base station 103 transmits unicast data r3 to mobile station 123. In addition, base station 102 transmits MBMS r2 data to relay node 110 and relay node 110 relay-transmits the MBMS r2 data to the mobile station

122.

With the transmission of the unicast data the base station mixes the unicast data so that the unicast data · can be distinguished from another piece of unicast data transmitted by using the same radio resource. That is, by using mix codes that differ from the initial value, the unicast data can be distinguished from another piece of unicast data transmitted by using the same radio resource. Accordingly, the unicast data r1 and r3 indicated in FIG. 24. Furthermore, with MBSFN transmission plural pieces of MBMS data are transmitted so that they can be distinguished. Therefore, the MBMS data pieces can be distinguished. That is, if the same frame format is used, they can be

<img file="MX336207B_D0015.tif" />

<td></td><td>distinguished pieces of data.</td><td>Institute Mexican</td>

<td></td><td>endowment</td><td>Property</td>

<td></td><td>However, the unicast data and the MBMS data</td><td>inüusfflaí</td>

<td> 5</td><td>they differ in frame format. Furthermore, there is no express provision for the unicast data and MBMS data differ in the initial value of the mixing code. Consequently, there is no guarantee that the data</td><td></td>

<td> 10</td><td>unicast and MBMS data can be distinguished by mixed. Also, unicast data and MBMS data can be broadcast at the same time by using the same radio resource. As a result, in an environment in which data from unicast and MBMS data, it may be impossible to distinguish between them.</td><td></td>

<td> 15</td><td>To be specific, there is no guarantee that it can be distinguished the mixing code for a PDSCH (Shared Link Channel Physical Descending), which is a radio channel used to transmit data from user in a unicast communication, and a mix code for a PMCH (Physical Multicast Channel), which is a radio channel used to</td><td></td>

<td> 20</td><td>transmit user data in an MBSFN transmission. As a result, it may be impossible to distinguish between a PDSCH and a PMCH. This can cause interference. In the case of FIG. 24, mobile station 121 is assumed is at a position where mobile station 121 can receive both the</td><td></td>

<td></td><td>unicast data r1 such as MBMS data r2 and that mobile station 123 is at a position where mobile station 123 can receive both the</td><td></td>

unicast data r3 such as MBMS r2 data.

<img file="MX336207B_D0016.tif" />

In this environment, mobile station 121 or 123Property originally wants to receive unicast data is not able to distinguish the ^ usfflaf MBMS r2 data transmitted from relay node 110, so that the data

MBMS r2 become an interference wave.

On the other hand, even if the unicast data and the MBMS data can be distinguished for a certain period of time, the base station or a base station and a relay node are not necessarily synchronized. Consequently, the schedule at which mixing begins, for example, one base station gradually deviates from the schedule at which mixing begins at the other base station.

This degrades the ability to identify codes. As a result, it is impossible to distinguish a PDSCH and a PMCH, and interference occurs.

FIG. 25 illustrates the occurrence of interference caused by a programming deviation. A black dot indicates MBMS data in the MBSFN transmission, and a white dot indicates unicast data. In a state in which the transmission sequence A1 and B1 can be distinguished, two pieces of MBMS data are on the same schedule, for example, on a T1 schedule. Consequently, the two pieces of MBMS data can be distinguished and no interference occurs. Two pieces of unicast data are on the same schedule as a T2 schedule. Consequently, the two pieces of unicast data can be distinguished and no interference occurs.

On the other hand, it is assumed that the transmission sequence A1

<img file="MX336207B_D0017.tif" />

changes to a transmission sequence A1a due to a programming deviation. In this case, the MBMS data and the unicast data are in the same schedule in transmission sequences A1a and B1 in each of schedules T3 through T6. Consequently, the MBMS 5 data and the unicast data cannot be distinguished and interference occurs.

This degrades the transmission characteristics of one or both of the MBMS data and the unicast data, resulting in degradation in transmission quality.

The present invention was made to solve problem 10 above. An objective of the present invention is to provide a radio communication system that can distinguish MBMS data and unicast data, prevent interference, and improve a feature of radio transmission.

tnduslrtcrf

Means to solve the problem

To solve the above problem, a radio communication system is provided. This radio communication system includes a first radio station that performs communication using a first radio signal, a second radio station, and a third radio station that is in an area common to a radio communication area of ​​the first radio station and a radio communication area of ​​the second radio station.

The second radio station includes a frame format conversion unit that converts, upon receipt of a second signal

<img file="MX336207B_D0018.tif" />

radio in which mixing cannot be distinguished from the first radio signal, a frame format of the second radio signal * The^to frame format conversion unit generates a third radio signal by mixing which can be distinguished from the first radio signal into the second radio signal to convert a frame format, and communicates with the third radio station by using the third radio signal.

Advantageous effects of the invention

Improves the quality of radio transmission.

The above and other objects, features and advantages of the present invention will become apparent from the following description taken in conjunction with the accompanying drawings, which illustrate the preferred embodiments of the present invention by way of example.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates an example of the structure of a radio communication system;

FIG. 2 illustrates an example of the structure of a radio communication system;

FIG. 3 illustrates an example of the structure of a radio communication system;

FIG. 4 illustrate an MBSFN network;

<img file="MX336207B_D0019.tif" />

FIG. 5 is a network operation sequence diagram

MBSFN;

FIG. 6 illustrates a radio communication system in a network

MBSFN;

FIG. 7 illustrates the replacement of a CP;

FIG. 8 illustrates the structure of a radio communication system;

FIG. 9 illustrates the structure of a relay node;

FIG. 10 illustrates the structure of the relay node;

FIG. 11 illustrates the structure of a mobile station;

FIG. 12 illustrates the structure of a radio communication system;

FIG. 13 is a sequence of operation diagram;

FIG. 14 illustrates the structure of a radio communication system;

FIG. 15 illustrates the structure of a radio communication system;

FIG. 16 is a sequence of operation diagram;

FIG. 17 illustrates the structure of a radio communication system;

FIG. 18 is a sequence diagram of MBMS data transmission before normal MBSFN transmission schedule;

<img file="MX336207B_D0020.tif" />

Macano da Da Inwufa

FIG. 19 illustrates the structure of a radio communication system;

FIG. 20 illustrates the radio data format;

FIG. 21 illustrates the reception and combination of data;

FIG. 22 illustrates the extent of the cell;

FIG. 23 illustrates countermeasures for a stalemate;

FIG. 24 illustrates the problem of being unable to distinguish &lt;unicast data and MBMS data; and

FIG. 25 illustrates the occurrence of interference caused by a programming deviation.

DETAILED DESCRIPTION OF THE INVENTION

Modalities will now be described with reference to the accompanying drawings. FIG. 1 illustrates an example of the structure of a radio communication system. A radio communication system 1 includes a radio station (first radio station) 1r, a radio station (second radio station) 2r, and a radio station (third radio station) 3r.

Radio station 1r communicates using a radio signal (first radio signal) d1. Radio station 2r receives a radio signal (second radio signal) d2 in which mixing is performed which cannot be distinguished from radio signal d1. Radio station 2r includes a 21 frame format conversion unit.

Institute radio station 3r is in a radio communication area (cell) of Ja. Me) 0CCno 09 the Property radio station 1r and a cell of radio station 2r. Industry)

Not being able to distinguish radio signal d1 and radio signal d2 means being unable to distinguish a mixing code that is performed on radio signal d1 and a mixing code that is performed on radio d2.

When the frame format conversion unit 21 included in the radio station 2r receives the radio signal d2, the frame format conversion unit 21 converts a conversion format of the radio signal d2 by performing mixing which can be distinguished from radio signal 10 d1 from radio signal d2. By doing this, the frame format conversion unit 21 generates a radio signal d2a (third radio signal). The frame format conversion unit 21 communicates with the radio station 3r using the radio signal d2a.

The contents of a service signal in the radio signal d2a are the same as those of a service signal in the radio signal d2. However, the frame format of the radio signal d2 is converted so that the radio signals d1 and d2a can be distinguished.

As described, even if the radio signals d1 and d2 cannot be distinguished, the frame format conversion unit 21 converts the frame format of the radio signal d2 to be distinguished from the radio signal d1. The frame 21 format conversion unit communicates with radio station 3r by using the radio signal

<img file="MX336207B_D0021.tif" />

distinguishable generated d2a. d®fa

To make it possible to distinguish radio signals d1 and d2, it is desirable that the frames (or the slots included in the frames) transmitted from the first and second radio stations be synchronized. Furthermore, different radio resources can be used for radio signals d1 and d2.

Radio signals d1 and d2a can be distinguished so that they do not interfere with each other. Therefore, the reception quality in the radio station 3r and the quality of the radio transmission in the entire system can be improved.

FIG. 2 illustrates an example of the structure of a radio communication system. A radio communication system 1A includes a base station (first base station) 10-1, a base station (second base station) 10-2, a relay node 20, and a mobile station 30.

The base station 10-1 communicates using a radio signal (first radio signal) d1. Base station 10-2 transmits a radio signal (second radio station) d2 that cannot be distinguished from radio signal d1. The relay node 20 includes a frame format conversion unit 21 and relays the radio signal d2 transmitted from the base station 10-2.

The frame format conversion unit 21 converts an M® ^ Iccnc fndusírtaí frame format from the radio signal d2 to a frame format that can be distinguished from the radio signal d1. That is, the frame format conversion unit 21 generates a radio signal d2a in the frame format.

<img file="MX336207B_D0022.tif" />

after the conversion and communicates with mobile station 30 by means of the use of the radio signal d2a.

IF relay node 20 relays radio signal d2 received from base station 10-2 to mobile station 30 without changing its frame format, radio signals d1 and d2 cannot be distinguished. Consequently, interference occurs.

On the other hand, with the radio communication system 1A, the relay node 20 performs the relayed communication by converting the frame format of the radio signal d2 to a frame format that can be distinguished from the radio signal d1 and by generating the d2a radio signal. As a result, the radio signals d1 and d2a do not interfere with each other. Therefore, the reception quality in the mobile station 30 and the quality of the radio transmission in the complete system can be improved.

FIG. 3 illustrates an example of the structure of a radio communication system. In a 1-1 radio communication system a radio signal d1 is a normal communication signal d1 and a radio signal d2 is a broadcast signal d2. The structure of the radio communication system 1-1 is the same as that of the radio communication system 1A illustrated in FIG. 2.

When a frame format conversion unit 21 receives the broadcast signal d2, the frame format conversion unit 21 converts a broadcast format that is a frame format of the broadcast signal d2 to a normal frame format that It is a frame format of the normal communication signal d1, and relay-transmits the broadcast signal d2 in the Canodad Dusírtaf

<img file="MX336207B_D0023.tif" />

normal frame format.

The frame format of a broadcast signal d2a that has ^ do ^ converted to the normal frame format is transmitted to a mobile station 30.

Even though mobile station 30 is in an environment in which mobile station 30 can receive both the normal communication signal d1 and the broadcast signal d2a, the frame format (normal frame format) of the normal communication signal d1 is the same as that of the broadcast signal d2a (ie there is a guarantee that radio signals in the same frame format can be distinguished) and interference does not occur. Therefore, the reception quality in the mobile station 30 and the radio transmission quality in the complete system can be improved.

In an example in which the 1-1 radio communication system is applied to MBMS, the structure of a system and its operation will now be described. First, the structure of a complete MBSFN network to which the radio communication system 1 -1 is applied will be described.

FIG. 4 illustrates an MBSFN network. An MBSFN 40 network includes an MBMS controller or MBMS control unit (hereafter referred to generically as the "MBMS controller") 41 which is an MCE (Multi-Cell Coordination / Multicast Entity), an MBMS GW (Gate) 42, BTS ( Base Transceiver Stations) 43a and 43b, and mobile stations 30-1 to 30-4.

The MBMS radio signal includes MBMS data and a control signal (hereinafter referred to as an "MBMS control signal) for

<img file="MX336207B_D0024.tif" />

institute receive an MBMS. The MBMS controller 41 controls the MBMS transmission for M © jdcano tí® to Ptópleciatí transmitting the MBMS control signal to the MBMS GW 42 and the base transceiver stations 43a and 43b. The MBMS GW 42 transmits the MBMS data to the base transceiver stations 43a and 43b. The MBMS GW 42 stores and manages the MBMS data and can be referred to as an MBMS data storage unit.

FIG. 5 is a sequence diagram of operation in the MBSFN network. The MBMS controller 41 performs the programming to determine the MBMS data to be transmitted and its transmission method (such as a modulation scheme), an encoding scheme, a transmission schedule, and a radio frequency to be used). The MBMS controller 41 then notifies the MBMS GW 42 of the information related to the modulation scheme, the encoding scheme, and the like, and a control signal generated based on the information.

Furthermore, the MBMS controller 41 requests the MBMS GW 42 to transmit the MBMS data to the base transceiver stations. The MBMS GW 42 receiving the news transmits the control signal (MCCH: Multicast Control Channel) and the MBMS data (MTCH: MBMS Traffic Channel) to the base transceiver station. In addition, the MBMS GW 42 alerts the base transceiver station of the control information, such as the transmission schedule and the radio frequency to be used, for the MBSFN transmission.

The base transceiver station receiving the alert from the

<img file="MX336207B_D0025.tif" />

control information, MBMS data, and control signal performed. ' the MBSFN transmission according to the control information. A noio® DF (Decode and Send) relay (which performs procedures such as demodulation, error correction decoding, and re-encoding and re5 modulation on a received radio signal and relay the result) that receives the MBSFN transmission performs the demodulation and decoding, error correction, and recoding and remodulation and transmits the obtained MBMS data to a mobile station.

The MBMS data forms an MTCH which is a logical channel, is mapped to an MCH (Multicast Channel) which is a transport channel, and is radio-transmitted via a PMCH which is a radio channel. When the MBMS data is transmitted, mixing is performed based on an ID (identifier) ​​according to an MBSFN area (see TS36.211).

The MBMS control signal is included in an MCCH which is a logical channel, is mapped to an MCH which is a transport channel, and is radio-transmitted via a PMCH which is a radio channel.

The MBMS controller 41 performs sorting, such as resource allocation and determination of an MCS (Modulation and Coding Scheme) and MBMS data transmission schedule, superimposes a sorting result on the MBMS control signal, and transmits them . Base transceiver stations 43a and 43b perform radio transmission based on the ordering result.

The previous MCS (which may also be referred to as an AMC

<img file="MX336207B_D0026.tif" />

(Modulation and Adaptive Coding) means a modulation scheme. ,,

<img file="MX336207B_D0027.tif" />

coding. With the MCS a modulation scheme or changes a coding rate and is used adaptively according to the quality of the radio channel. The MCS includes attributes such as a modulation scheme, 5 an encoding rate, and a transmission rate.

For example, with MCS1, a modulation scheme is QPSK (Quadrature Phase Change Manipulation), a coding rate is 1/8, and a transmission rate is 1,891 Mb / s. With MCS5 a modulation scheme is 16QAM (Amplitude Modulation of

Quadrature), an encoding rate is ¹Λ, and a transmission speed is 15,221 Mb / s. An optimal MCS is usually selected according to the receiving state of a mobile station.

The MBMS controller 41 selects one of a plurality of

MCS. One method of selecting an MCS is to select an MCS with a cell in which a propagation characteristic (propagation in the environment) is more undesirable than the reference and apply the same selected MCS to the entire area of ​​an MBSFN.

For example, if the determination that communication is made based on MCS1 in a cell in which a propagation characteristic becomes more undesirable, then MCS1 applies to all other cells in an MBSFN area (MCS1 is also applies to a cell in which a propagation characteristic is good). It is also possible to establish a certain MCS regardless of a

<img file="MX336207B_D0028.tif" />

spread.

The operation of the radio communication system in an MBSFN network will now be specifically described. In the following description certain unicast data will be given as an example of a normal communication signal, a unicast frame format is an example of a normal frame format, MBMS data is an example of a broadcast signal, and a format of MBSFN framework is an example of a broadcast format.

FIG. 6 is a radio communication system in a network

MBSFN. A radio communication system 1a includes an MBMS controller

41, an MBMS GW 42, base transceiver stations 43a to 43c, a relay node 20, and mobile stations 30-1 to 30-4. Relay node 20 includes a frame 21 format conversion unit.

Base transceiver station 43a transmits MBMS data in the MBSFN frame format to mobile station 30-1 and to relay node 20.

Base transceiver station 43b transmits unicast data in the unicast frame format to mobile station 30-3. Base transceiver station 43c transmits unicast data in the unicast frame format to mobile station 30-4.

When the frame format conversion unit 21 included in relay node 20 receives the MBMS data in the frame format

MBSFN, the 21 frame format conversion unit converts the MBSFN frame format to the unicast frame format and transmits the data í («tuto cano ledacf dusfíiat

MBMS to the unicast frame format.

<img file="MX336207B_D0029.tif" />

It is assumed that mobile station 30-2 receives data relayed by relay node 20 and that mobile station 30-2 is in a mobile station area 30-2 can also receive unicast data transmitted from base transceiver station 43b.

If relay node 20 relay-transmits the MBMS data in the MBSFN frame format to the mobile station 30-2 under these conditions, then the mobile station 30-2 receives both the MBMS data in the MBSFN frame format and the data from the unicast in the unicast frame format.

liitíusW,

With the MBSFN frame format the MBMS data is transmitted via a PMCH radio channel. With the unicast frame format the unicast data is transmitted via a PDSCH radio channel. However, there is no guarantee that a code for mixing performed on a PMCH and a code for mixing performed on a PDSCH can be distinguished. Consequently, it may be impossible to distinguish these codes. As a result, MBMS data interferes with unicast data at the mobile station.

30-2.

On the other hand, relay node 20 is assumed to include frame format conversion unit 21. When the frame format conversion unit receives the MBMS data in the MBSFN frame format, the frame format conversion unit 21 changes the frame format of the MBMS data from the MBSFN frame format to the unicast frame format and relay-transmits the MBMS data on the

<img file="MX336207B_D0030.tif" />

unicast frame format.

That is, the MBSFN frame format is converted to the unicast frame forms (radio data format that uses an extended CP is converted to a radio data format that uses a normal CP), so that the MBMS data can be transmitted not via radio channel

PMCH if not via PDSCH radio channel.

As a result, the MBMS data in the unicast frame format transmitted from a relay node 20 does not interfere with the unicast data in the unicast frame format transmitted from the base transceiver station 43b.

That is, MBMS data and unicast data are transmitted via PDSCH radio channels, so there is a guarantee that MBMS data and unicast data can be distinguished. This is because preventing interference. Consequently, the mobile station 30-2 can substantially receive the MBMS data that is transmitted from the relay node 20 and which originally wishes to receive the mobile station 30-2.

In the above description the frame format conversion unit 21 changes the frame format of the MBMS data from the MBSFN frame format to the unicast frame format and relay-transmits the data

MBMS. By changing the frame format of the MBMS data from the MBSFN frame format to a single cell MBMS frame format and relaying the MBMS data, however, the occurrence of interference can also be prevented. Now we will describe a single MBMS

<img file="MX336207B_D0031.tif" />

but also single-cell MBMS transmission (referred to as (single-cell transmission ”is used in TS36.300, but in this specification the term“ single-cell MBMS transmission ”is used to differentiate it from unicast transmission) in which MBMS data is transmitted only to a specific cell.

With MBSFN transmission, MBMS data is transmitted to the total of an area that is a group of cells. With single-cell MBMS transmission, unlike MBSFN transmission, MBMS data is transmitted only to a specific cell. Consequently, there is no need for a plurality of base transceiver stations to transmit the same data on the same frequency with the same programming. As a result, each base transceiver station performs the ordering.

Furthermore, MBMS data is transmitted to a cell, so that the propagation distance is short compared to MBSFN transmission. As a result, the length CP can be made shorter. In other words, a normal CP used in unicast communication can be used. This means that unicast transmission can be performed.

That is, the transmission can be done using a PDSCH which is a radio channel used in unicast communication.

Therefore, when the 21 frame format conversion unit receives the MBMS data in the MBSFN frame format, the unit

<img file="MX336207B_D0032.tif" />

21 frame format conversion can convert the frame format effe ία

MBSFN to the unicast frame format or a single cell MBMS frame format. By relay-transmitting the MBMS data in the unicast frame format or the single cell MBMS frame format, interference occurrence in the mobile station can be prevented.

The format conversion (replacement of a redundant portion (CP)) will now be described. FIG. 7 illustrates the replacement of a CP. When frame format conversion unit 21 converts frame format

MBSFN to unicast frame format or single cell MBMS frame format, frame format conversion unit 21 performs data format conversion by replacing an extended CP with a normal CP.

Fextean Institute of Industrial Riety

By adding a short normal CP to the received data, the amount of information that can be transmitted can be increased by using an empty field (because [the length of the normal CP) &lt;(length of the extended CP) or the transmission can be done with a decrease in the encoding speed and increase the number of parity bits. As a result, a transmission characteristic can be improved (transmission can be performed with an unchanged encoding rate and 0 or 1 inserted into bits not used as padding characters).

Now we will describe the case where the unicast frame format is converted to the MBSFN frame format. FIG. 8 illustrates the structure of a radio communication system. The structure of the system

<img file="MX336207B_D0033.tif" />

Instituto radiocomunicación 1a-0 is the same as that of the · Mexicano Property radiocomunicación 1a system illustrated in FIG. 6. However, in the case of fjiduitlla. FIG. 8, the unicast frame format is converted to the frame format

MBSFN.

A base transceiver station 43a transmits unicast data in the unicast frame format to a mobile station 30-1 and a relay node 20. A base transceiver station 43b transmits data

MBMS in the MBSFN frame format to a 30-3 mobile station. A base transceiver station 43c transmits MBMS data in the MBSFN frame format to a mobile station 30-4.

When a 21 frame format conversion unit included in relay node 20 receives the unicast data in the unicast frame format, the 21 frame format conversion unit converts the unicast frame format to the MBSFN frame format and transmits the unicast data in the MBSFN frame format (the radio data format using a normal CP is converted to a radio data format using an extended CP).

As a result, the unicast data in the frame format

MBSFNs transmitted from relay node 20 do not interfere with MBSFN frame format MBMS data transmitted from base transceiver station 43b. A reverse frame format conversion to that described in FIG. 6 can also be done in this way.

The structure of relay node 20 will now be described.

K. institute methods for releasing through the relay node 20 divide Mexican wtaPto¿íecf_acj widely in an AF method (Amplify and Send) and the DF method. With the AF industry method, a relay node receives a radio signal transmitted from a base transceiver station or a mobile station, amplifies the received radio signal 5, and transmits a obtained radio signal to a mobile station or a base transceiver station. .

With the DF method, as described above, a relay node receives a radio signal transmitted from a base transceiver station or a mobile station, performs an error correction procedure by demodulating and decoding, again performs encoding and modulation , and transmits a obtained signal to a mobile station or a base transceiver station. The structure of the relay node 20 having the function DF will now be described.

FIGS. 9 and 10 illustrate the structure of relay node 20. The relay node 20 includes an antenna a1, a receiver unit 22a-1, a demodulation and decoding unit 22a-2, a radio channel quality information acquisition unit 23a, a computer 24a, an adjustment unit of channel 25a, an uplink connection request signal extraction unit 26a-1, an uplink connection request signal generation unit 26a-2, an uplink transmission control signal generation unit 26a-3, a channel quality measurement unit 27a-1, a channel quality information generation unit 27a-2, an encoding unit and

<img file="MX336207B_D0034.tif" />

28a-1 modulation, and a 28a-2 transmission unit.

In addition, relay node 20 includes an antenna a2, a receiving üñT 22b-1, a demodulation and decoding unit 22b-2, a downlink transmission control signal extraction unit 23b-1, an extraction unit for MBMS control signal 23b2, a downlink control signal generating unit 23b3, an MBSFN transmission control unit 23b-4, a transmitted data buffer 24b, a frame format conversion unit 21, a 25b-1 encoding and modulation unit, and a transmission unit

25b-2.

Based on an ordering result, the receiving unit 22a-1 and the demodulation and decoding unit 22a-2 receive an uplink radio signal transmitted from a mobile station via antenna a1, reduce its frequency, and demodulate and they decode an uplink signal after frequency reduction.

The radio channel quality information collection unit 23a collects radio channel quality information (indicator of the quality of a radio channel between the relay node and the mobile station) from being the uplink signal after the demodulation and decoding and transmits the radio channel quality information to the computer 24a.

The uplink connection request signal extraction unit 26a-1 extracts the uplink connection request signal from the uplink signal after demodulation and

<img file="MX336207B_D0035.tif" />

1l &amp; IÍUtO decoding and transmits the up-tican link connection request signal to the channel setting unit 25a. When the adjustment unit¹channel 25a receives the uplink connection request signal, the channel setting unit 25a transmits uplink connection request signal generation instructions based on the ordering result.

When the uplink connection request signal generation unit 26a-2 receives the uplink connection request signal generation instructions, the uplink connection request signal generation unit 26a-2 generates a uplink connection request signal. The uplink transmission control signal generation unit 26a-3 generates an uplink transmission control signal based on the ordering result.

The channel quality measurement unit 27a-1 measures the quality of a channel between a base transceiver station and the relay node 20 and transmits a measurement result to the channel quality information generation unit 27a-2. The channel quality information generating unit 27a-2 generates channel quality information based on the measurement result.

Based on the ordering result, the modulation and encoding unit 28a-1 and transmission unit 28a-2 encode and modulate the uplink connection request signal, the

<img file="MX336207B_D0036.tif" />

IU gg 'Ssgi uplink transmission control, and quality information from cano d® to Wo) ¡__ channel, superimpose these signals on each other, increase the frequency of an obtained Iridujfrtoí signal, and transmit a signal to the transceiver station base via the a2 antenna.

Based on the encoding and modulation related information included in a downlink transmission control signal, the receiver unit 22b-1 and the demodulation and decoding unit 22b-2 receive via antenna a2 a radio link signal downlink transmitted from the base transceiver station, decrease its frequency, and demodulate and decode a downlink signal after reducing its frequency. The downlink transmission control signal extraction unit 23b-1 extracts the downlink transmission control signal from the downlink signal and transmits it to the receiver unit 22b-1 and the demodulation and decoding unit 22b-2.

The MBMS control signal extraction unit 23b-2 extracts an MBMS control signal from the downlink signal and transmits it to the transmission control unit MBSFN 23b-4. The MBSFN transmission control unit 23b-4 adjusts the MBSFN control on the computer 24a.

The transmitted data buffer 24b buffers the downlink signal and downloads the data based on a sort result. The frame format conversion unit 21 converts the frame format of the downlink signal after the

<img file="MX336207B_D0037.tif" />

damping (MBSFN -&gt; unicast, for example). The unit of gener | downlink control signal 23b-3 generates a downlink cc______ signal based on the sort result.

Based on the ordering result, the modulation and encoding unit 25b-1 and transmission unit 25b-2 encode and modulate the downlink control signal and the downlink signal after frame format conversion , increases the frequency, and transmits them to the mobile station via antenna a1.

The structure of a mobile station will now be described. FIG.

eleven illustrates the structure of a mobile station. A mobile station 30 includes an antenna a3 and a receiving unit 31. The mobile station 30 is assumed to be in an area where the mobile station 30 can receive a radio signal (first radio signal) d1 and a radio signal ( second radio signal) d2 which cannot be distinguished from signal d1.

When the receiving unit 31 receives the radio signal d1, the receiving unit 31 performs a procedure to receive the radio signal d1. Alternatively, a frame format of the radio signal d2 is converted to mobile station 30 together with a format frame that can be distinguished from radio signal d1, and receiver unit 31 performs a procedure for receiving a radio signal d2a in the frame format after conversion.

Detailed operation in a radio communication system will now be described. In a first modality, the operation is carried out at the time of converting the MBSFN frame format to the frame format of the Mexican Unicast Institute and the completion of the transmission relay will be described ^ ^ ^^^rol³^^^to^ Industrial relay node included in a radio communication system has an NBMS sorting function.

FIG. 12 illustrates the structure of a radio communication system. A radio communication system 1a-1 includes an MBMS controller 41, an MBMS GW 42, base transceiver stations 43a and 43b, a relay node 20a, and mobile stations 30-1 to 30-3. Relay node 20a includes a frame format conversion unit and a computer 2a.

Relay node 20a originally includes a computer for unicast communication. However, computer 2a not only has a unicast communication ordering function but also an MBMS ordering function.

Base transceiver station 43a transmits MBMS data in the MBSFN frame format to mobile station 30-1 and to relay node 20a.

Base transceiver station 43b transmits unicast data in the unicast frame format to mobile station 30-3.

When the frame format conversion unit included in relay node 20a receives MBMS data in the MBSFN frame format, the frame format conversion unit 21 converts the frame format

MBSFN in the unicast frame format and transmits the MBSFN data in the unicast frame format to the mobile station 30-2.

<img file="MX336207B_D0038.tif" />

Title

Mobile station 30-2 requests MBMS controller 41 via au £ '^,spoutrelay node 20a and base transceiver station 43a to relay the MBSFN transmission. Relay node 20a receiving the request requests MBMS controller 41 via base transceiver station 43a to relay MBSFN transmission and transmit MBMS control information handled by MBMS controller 41 to relay node 20a.

FIG. 13 is a diagram of sequences of operation. In FIG. 13, it is assumed that a relay request from a mobile station is transmitted to at least one DF relay node, that the relay request is transmitted to a base transceiver station via the DF relay node, and that the relay request is transmitted to an MBMS controller via the base transceiver station.

The MBMS controller receiving the relay request transmits MBSFN transmission information (information indicative of the type of MBMS data transmitted, the MBMS data that has already been transmitted, and the like) contained by the MBMS controller, to the DF relay node so that the DF relay node will change the frame format of the data

MBMS received from the MBSFN frame format to the unicast frame format and so that the DF relay node transmits the MBMS data to the mobile station. In FIG. 13, the MBMS driver transmits MBSFN transmission information before sorting. However, the controller

MBMS can transmit the MBSFN transmission information after sorting.

<img file="MX336207B_D0039.tif" />

Inwuto

In addition, the mobile station can transmit radio channel quality Ice Mexicano information to the DF relay node after transmission btdUiM £ MBSFN from the base transceiver station to the DF relay node. Furthermore, it is necessary for the DF relay node to be able to notify the mobile station of the relay start schedule before unicast communication. The MBMS data is transmitted to the DF relay node via the MBSFN transmission.

Based on the radio channel quality information transmitted from the mobile station, the DF relay node receiving the data

MBMS generates MBMS control information to be transmitted to the mobile station by using at least one MBMS control information transmitted from the MBMS controller and MBMS control information included in the MBMS data transmitted from the base transceiver station. The relay node DF transmits the MBMS control information to the mobile station as control information for unicast communication, and then transmits the MBMS data.

The MBMS controller that receives a request to transmit the MBMS control information transmits the MBMS control information including, for example, information related to the service received by the mobile station to the relay node DF via the base transceiver station. The control information indicative of a part of the service data that has already been received by the mobile station can be taken as a concrete example of the MBMS control information related to the service. This

<img file="MX336207B_D0040.tif" />

service.

control information is important to maintain the continuity of the

Mexican Property

Industrial

Based on the above MBMS control information, the DF relay node generates an MBMS control signal and generates an MCCH that is a logical channel. This MCCH is mapped to an MCH that is a transport channel, and is broadcast by radio via a PMCH that is a radio channel.

If the MBMS control information is not transmitted from the MBMS controller or if the DF relay node cannot generate an MBMS control signal (for example, it cannot generate an MCCH), then the DF relay node informs the mobile station that it cannot relay the MBSFN transmission, and does not relay the MBSFN transmission.

If a number of mobile stations requesting the MBSFN transmission relay is less than or greater than a threshold set in advance, then the DF relay node does not relay the MBSFN transmission and informs the mobile stations that the DF relay node does not relay the transmission MBSFN.

A mobile station that is informed that the DF relay node cannot relay the MBSFN transmission performs a handover to another relay node or base transceiver station. To be specific, the mobile station measures the receive power of other relay nodes or base transceiver station and selects a relay node or the base transceiver station from which the receive power is the highest as a destination of handover, and perform the handover to it.

<img file="MX336207B_D0041.tif" />

Based on the quality of the channel (or a quality indicator) of Mexicano, it appropriately provides a downlink between relay node 20a and industrial mobile station 30-2 transmitted from mobile station 30-2, computer 2a included in the Relay node 20a then performs the ordering in the same way that 5 is used to transmit unusion data between relay node 20a and mobile station 30-2. Computer 2a determines the radio resources to transmit MBMS data and an MBMS control signal and a modulation scheme.

The computer 2a can also perform the ordering of the unicast data and the relieved MBMS data op refe rently while ordering the unicast data or the relieved MBMS data.

Furthermore, the computer 2a can perform the ordering of the communication of the unicast data and the communication of the MBMS data separately.

As indicated before, on another relay 20a it receives the MBMS control information and performs the sorting. If the relay node 20a can relay the MBSFN transmission as a result of the ordering then the relay node 20a informs the mobile station 30-2 which makes a request to relay the MBSFN transmission so that the relay node

20a can relieve the MBSFN transmission.

That is, the relay node 20a uses control information to give the mobile station 30-2 notice that the relay node 20a relays the MBMS data in the unicast frame format. The receiving mobile station 30-2 receives a downlink physical control channel (DPCCH). By doing this, the mobile station 30-2 extracts control information

<img file="MX336207B_D0042.tif" />

fni

Mercan _ (MCS and the like) for communication of unicast PtOpl &amp; fdusfrfar unicast data downlink and receive a downlink radio channel PDSCH including MBMS data according to MBMS control information.

If the mobile station 30-2 receiving the radio channel PDSCH 5 can receive the MBMS data without error, then the mobile station 30-2 returns an ACK to the relay node 20a. If the mobile station 30-2 receives the MBMS data including errors, then the mobile station 30-2 returns a NACK to the relay node 20a (an MBMS data relay method can be adopted in which no ACK or NACK is returned).

Now we will describe a procedure performed to relay MBMS data. When the relay node 20a receives MBMS data transmitted from the base transceiver station 43a, the relay node 20a converts the received data mapped to a slot format using an extended CP to a slot format using normal CP. Relay node 20a then performs encoding and modulation of the data and transmits the data to mobile station 30-2.

Based on the transmitted transmission control signal from relay node 20a through the use of a DPCCH, mobile station 30-2 establishes a demodulation scheme and a decoding scheme. Upon receiving a PDSCH through which unicast data is transmitted, mobile station 30-2 receives the MBMS data.

In the above description mobile station 30-2 makes a request via relay node 20a to relay the MBSFN transmission. No

<img file="MX336207B_D0043.tif" />

However, as a result of handover, the base transceiver station od

upper radio channel control station can request the Industry node) relay 20a to relay the MBSFN transmission.

Furthermore, relay node 20a generates an MCCH. However, the following method can be used. Relay node 20a handles MBMS control information. When the relay node 20a transmits the MBMS data, the relay node 20a informs the MBMS controller 41 of the MBMS control information and the MBMS controller 41 generates an MCCH.

As described, relay node 20a relays the data

MBMS received towards mobile station 30-2 in the unicast frame format. As a result, it is possible to relay MBMS data without causing interference.

Also, a radio data format using an extended CP is converted to a radio data format using a normal CP at the time of the frame format conversion. As a result, transmission can be performed with a decrease in the encoding rate and an increase in the number of parity bits. Therefore, a transmission characteristic or transmission speed can be improved.

Furthermore, based on the quality of a downlink between relay node 20a and mobile station 30-2 transmitted from mobile station 30-2, the ordering is performed in the same manner as is used to transmit unicast data between relay node 20a and mobile station 30-2. By doing this, an optimal transmission method can be selected.

<img file="MX336207B_D0044.tif" />

As a result, a transmission characteristic of transmission speed can be improved. todusfitat

Now we will describe the operation to convert the MBSFN frame format to the single cell MBMS frame format and perform relay transmission 5 as a second mode. FIG. 14 illustrates the structure of a radio communication system. The structure of a radio communication system 1a-2 is the same as that of the radio communication system 1a-1 illustrated in FIG. 12. The radio communication system 1a-2 differs from the radio communication system 1a-1 in that the frame format conversion unit 21 converts the MBSFN frame format to the single cell MBMS frame format.

A mobile station 30-2 makes a request to relay an MBSFN transmission. A base transceiver station 43a requests an MBMS controller 41 to transmit MBMS control information to a relay node 20a. This is the same as with the first modality.

The MBMS controller 41 that is requested to transmit MBMS control information transmits the MBMS control information to relay node 20a in response to the request. Based on the transmitted MBMS control information, relay node 20a generates a control signal and generates an MCCH which is a logical channel. Relay node 20a maps this MCCH to a DL-SCH (Downlink Shared Channel) which is a transport channel, and performs single cell MBMS transmission by using a PMCH which is a radio channel.

LULSIIÍélJ iñiSituto

With the MBMS transmission of a single cell, a Proprietary Merchant can be used

Short CP. This is the same with unicast transmission. Accordingly, the tftdutTftet relay node 20a receives MBMS data transmitted from the base transceiver station 43a using an extended CP, and performs demodulation and decoding. Thereafter, relay node 20a converts the format of the MBMS data to the format that a normal CP uses, performs encoding and modulation of the MBMS data, and transmits the MBMS data to the mobile station 30-2. This is the same as with the first modality.

A third embodiment will now be described. In the third embodiment, a base transceiver station performs an MBMS ordering function. Furthermore, a plurality of relay nodes are installed.

FIG. 15 illustrates the structure of a radio communication system. A radio communication system 1a-3 includes an MBMS 41 controller, an MBMS GW 42, base transceiver stations

43a-1 and 43b, an RN relay node, and mobile stations 30-1 to 30-3. The base transceiver station 43a-1 includes an MBMS 4 computer.

The AF RNaf relay nodes and the DF RN relay nodes_Df can be confused. The case where the relay nodes AF RNaf and the relay nodes DF RN_DF they can be confused in a cell of the base transceiver station 43a-1 or in the relay node DF is in a cell of the base transceiver station 43a-1 (FIG. 15 indicates a group of relay nodes in which the relay nodes AF RN_TOf and the DF RNdf relay nodes can be confused as a relay node RN) and

<img file="MX336207B_D0045.tif" />

will describe where base transceiver station 43a-1 performs ctokxl ordering of communication between all relay nodes and the mobile station (the taduafrfof relay node AF does not perform demodulation or decoding, so does not perform frame format conversion ).

FIG. 16 is a sequence of operation diagram. FIG.

it is an example of a registered procedure in the case of a central planning. FIGS differ in three respects. 16 and 13. First, a mobile station transmits information (radio channel quality information) indicative of the quality of a radio channel between a DF relay node and the mobile station to a base transceiver station via the DF relay node. Second, the base transceiver station performs full communication ordering by all mobile stations including a mobile station under the control of the relay node DF and a mobile station that communicates directly with the base transceiver station based on the information from radio channel quality, information indicative of the quality of a radio channel between the base transceiver station and the mobile station that communicates directly with the base transceiver station, and the like. The quality of the radio channel between the base transceiver station and the mobile station that communicates directly with the base transceiver station is measured by this mobile station. Third, the control information regarding a transmission relief method

MBSFN determined as a result of the sorting and MBMS data is transmitted to the mobile station via the relay node DF.

<img file="MX336207B_D0046.tif" />

The following method is also discussed as a method of ordering communication between the relay node RN and mobile station 30-2. NdUSfrlaf The base transceiver station 43a-1 performs the total ordering of the communication through the relay node RN in the cell of the base transceiver station 43a-1.

The base transceiver station 43a-1 thus performs transmission and receiver sorting by one or more RN relay nodes that are in the base transceiver station cell 43a-1 and which perform the relay. This method is referred to as centralized ordering in the sense that a centrally based transceiver station performs the ordering.

In the unicast transmission of information or transmission

Single cell MBMS indicative of the quality of a radio channel between relay node RN and mobile station 30-2, transmitted from mobile station 15-2 to relay node RN, is transmitted from relay node RN to the 43a-1 base transceiver station.

Base transceiver station 43a-1 collects radio channel quality information transmitted from DF RNdf relay nodes and mobile station 30-1 with which base transceiver station 43a-1 communicates directly on computer 4 and performs ordination. Base transceiver station 43a-1 then transmits ordering information to each of the DF RN relay nodes_Df by using a radio channel.

<img file="MX336207B_D0047.tif" />

An ordering DF relay node generates a control signal based on the kkftíiftlW · MBMS control information and generates an MCCH that is a logical channel. The DF RN relay node_Df maps this MCCH to an MCH that is a transport channel, and transmits the MCH over the radio using a PMCH that is a radio channel. When the relay node DF RN_DF it receives MBMS data, changes its frame format to unicast frame format or single cell MBMS frame format, and transmits the MBMS data to mobile station 30-2.

A fourth embodiment will now be described. In description 10 above the MBSFN transmission is performed between the base transceiver station and the relay node. However, in the fourth embodiment the unicast transmission is performed between a transceiver station and a relay node and the MBSFN transmission is performed between the relay node and a mobile station.

FIG. 17 illustrates the structure of a radio communication system. A radio communication system 1a-4 includes an MBMS controller 41, an MBMS GW 42, base transceiver stations 43a-2, 43b, and 43c, a relay node 20b, and mobile stations 30-1 to 30-3.

Base transceiver station 43c transmits unicast data in the unicast frame format to mobile station 30-1. Base transceiver station 43b transmits MBMS data in the MBSFN frame format to mobile stations 30-2 and 30-3.

The 43a-2 base transceiver station includes a

<img file="MX336207B_D0048.tif" />

Ins frame 21-1 format conversion and relay node 20b includes a Monean © ti © te Property frame 21-2 format conversion unit. The tndusTrh frame format 21-1 conversion unit included in the base transceiver station 43a-2 converts the MBSFN frame format to the unicast frame format and transmits MBMS data in the unicast frame format. The frame format 21-2 conversion unit included in relay node 20b converts the unicast frame format to the MBSFN frame format and transmits the MBMS data in the MBSFN frame format.

The operation will be described. When a relay from the transmission

MBSFN is requested from mobile station 30-2 to relay node 20b, relay node 20b gives notice of this request to base transceiver station 43a-2 and to MBMS controller 41. The receiving MBMS controller 41 instructs the MBMS GW 42 to transmit MBMS data to be transmitted to mobile station 30-2 and relay node 20b to relay to base transceiver station 43a-2 (eg, so minus the time corresponding to a delay caused by a relay procedure performed by relay node 20b) before scheduling of the normal MBSFN transmission.

The base transceiver station 43a-2 receives the MBMS data and the frame format conversion unit 21-1 included in the base transceiver station 43a-2 converts the format including an extended CP used for normal MBSFN transmission to the format which includes a normal CP. The base transceiver station 43a-2 transmits the MBMS data in the unicast frame format to the relay node 20b.

InWuto Mexican Property kidutfrk

Relay node 20b receives the MBMS data in the unicast frame format and the communication format conversion unit

21-2 included in relay node 20b converts the format using a normal CP to the format that includes an extended CP. Relay node 20b transmits the MBMS data in an MBSFN frame format to the mobile station

30-2.

As a result, it is possible to perform MBSFN transmission between base transceiver station 43a-2 and relay node 20b without interfering with communication between base transceiver station 43b and mobile station 30-2. Furthermore, the base transceiver station 43a-2 transmits the MBMS sides before scheduling the normal MBSFN transmission, so that the mobile station 30-2 can receive and combine the MBMS data transmitted via the relay node 20b and the MBMS data transmitted from base transceiver station 43b.

FIG. 18 is a data transmission sequence diagram

MBMS before scheduling the normal MBSFN transmission.

(S1) Base transceiver station 43a-2 transmits data

MBMS in the unicast frame format to relay node 20b, for example, at least when it corresponds to a delay caused by a relay procedure performed by relay node 20b (a time that corresponds to a delay caused by a series of procedures, that is, by a demodulation procedure and

InOuto

I &amp; sound decoding and a coding and modulation procedure performed 1 ^ í | q Fropistíod irttíufifrta!

relay node 20b, which is, for example, a relay node DF) before the normal MBSFN transmission schedule.

(52) Relay node 20b performs the demodulation and decoding procedure and the encoding and modulation procedure on the MBMS data.

(53) The 21-2 frame format conversion unit included in relay node 20b converts the unicast frame format to the MBSFN frame format and converts the format using a normal CP to the format using an extended CP.

(54) The relay node 20b transmits the MBMS data in the MBSFN frame format to the mobile station 30-2.

(55) The base transceiver station 43b transmits the data

MBMS in the MBSFN frame format to mobile station 30-2.

(S6) Mobile station 30-2 receives and synthesizes transmitted MBMS data via relay node 20b and transmitted MBMS data from base transceiver station 43b.

In the above sequence diagram the base transceiver station 43a-2 transmits MBMS data in the unicast frame format prior to the normal MBSFN transmission schedule and the relay node

20b converts the unicast frame format to the MBSFN frame format.

However, when base transceiver station 43a-2 transmits MBMS data in the MBSFN frame format prior to programming

<img file="MX336207B_D0049.tif" />

normal MBSFN transmission, relay node 20b also converts ta

Indusfttot MBSFN frame format to unicast frame format.

A modification of the above radio communication systems will now be described. In the above description the format that a

Extended CP is used for MBSFN transmission for the purpose of making it easy to receive the MBSFN transmission from a remote base transceiver station and to increase the number of MBMS data pieces that can be received and synthesized, i.e. for the purpose of making possible receiving MBMS data for which a propagation delay is long.

The fact that the use of an extended CP makes it possible to receive MBMS data for which a propagation delay is long, shows that the radius of a cell can increase. Accordingly, in the modification an extended CP is used to transmit data that is not limited to MBMS data in a cell that is larger than a cell in which a normal CP is used.

If a relay node is installed in a cell with a long radius in the modification, then the relay node performs communication using a normal CP because the radius of a cell in the relay node is short for use.

FIG. 19 illustrates the structure of a radio communication system. A radio communication system 1b includes a base transceiver station 43a, a relay node 20c, mobile stations 30-1 and 30-2 (MBMS controller 41, an MBMS GW 42, and the like are not illustrated). The

<img file="MX336207B_D0050.tif" />

__

Int

Wiggle!

Relay node 20c includes a 2c-1 radio and receive unit and ¿fci Proeles a 2c-2 frame format conversion unit.

A cell 51 is a cell of the base transceiver station 43a and a cell 52 is a relay area of ​​the relay node 20c. Relay node 20c and mobile station 30-1 are inside cell 51. Mobile station 30-2 is external to cell 51 and is inside cell 52.

The radio reception and reception unit 2c-1 performs a radio transmission and reception procedure with the base transceiver station 43a or the mobile station 30-2. When the frame format conversion unit 2c-2 communicates with the base transceiver station 43a, the frame format conversion unit 2c-2 communicates using a first radio data format using a first redundant portion (eg, extended CP). When the frame format conversion unit 2c-2 communicates with the mobile station 30-2, the frame format conversion unit 2c-2 communicates using a second radio data format using a second redundant portion (eg normal CP) that is shorter than the first redundant portion.

In downlink transmission the base transceiver station 43a transmits D1 data in the format using an extended CP. When the relay node 20c receives the D1 data, the frame format conversion unit 2c-1 transmits D2 data whose format is converted to the format using a normal CP to the mobile station 30-2.

OR

<img file="MX336207B_D0051.tif" />

In uplink transmission the mobile station transmits D2 data in the format that a normal CP uses to relay node 20c.

When the relay node 20c receives the D2 data, the frame format conversion unit 2c-2 generates D1 data by converting the format to the format using an extended CP, and transmits the D1 data to the base transceiver station 43a.

cone tedad frtdvi?. '' * ·

As a result, mobile station 30-1 within cell 51 receives data in the format that an extended CP uses, so that mobile station 30-1 receives and synthesizes plural pieces of data. Consequently, the receiving quality can be improved. Furthermore, relay node 20c relays data in the format that a normal CP uses to mobile station 30-2, so that transmission can be performed with a decrease in the encoding rate and the number of parity bits can increase. Therefore, a transmission characteristic can be improved.

The foregoing is considered only as illustrative of the principles of the present invention. Furthermore, since numerous modifications and changes will be readily devised by those skilled in the art, it is not desired to limit the invention to the exact construction and applications shown and described, and accordingly, all suitable modifications and equivalents must be considered to be within the Scope of the invention in the appended claims and their equivalents.

Institute

Mexican

Explanation of the reference signs Cs $ J¡3 Property

Industry

one. Radio communication system

1st, 2nd, 3rd radio station frame format conversion unit

D1, d2, d2a radio signal