Radio communication system

FIELD: radio engineering, communication.

SUBSTANCE: invention relates to communication systems. The volume of wireless communication between a relay station and a base station is reduced in order to improve the quality of communication, which is the technical result. A wireless communication system includes a relay station, a first radio base station, second radio base stations and a mobile station. The relay station is wirelessly connected to the first radio base station and communicates with the second radio base stations through the first radio base station. When the relay station communicates with the second radio base stations, the relay station requests the first radio base station to communicate with the second radio base stations for the relay station. The requested first radio base station communicates with the second radio base stations for the relay station and transmits the communication result to the relay station.

EFFECT: high quality of communication.

4 cl, 19 dwg

 

AREA of TECHNOLOGY

Implementation options discussed in this document, refer to the radio system, for example a mobile telecommunication system.

PRIOR art

The cellular communication system has become a major area of mobile telecommunication systems, for example systems of mobile telephony. Using the cellular system a large number of areas (cells), each base station can perform transmission and reception are combined for communication in a wide area. When the mobile station moves, the base station switches to continue communication.

At present, the mobile telecommunication service of the third generation system based on CDMA (multiple access code division). Widely discussed mobile telecommunication system of the next generation, which enables high-speed connection.

On the other hand, in 3GPP (partnership Project third generation) discusses the LTE System (long term development) and high-speed Radiocommunication service called LTE-advanced (advanced LTE), which is a further developed version of LTE. In LTE-advanced the introduction of a relay station is discussed as a method to increase the capacity or improve performance in the area of lack of acceptance.

You can do the impossible, to the mobile station recognizes the presence of the relay station. However, in 3GPP primarily discusses how to make relay station to operate exactly as the normal base station. In this case, the upper base station to relay station operates from the point of view of a relay station just as a point of connection type on the router.

As the prior art proposes a method to reduce the number of times to run the mobile transfer station in a radio communication system in which a relay station, by reducing the volume of the alarm (patent document 1).

The LIST of SOURCES

PATENT LITERATURE

PTL1: Japanese laid application No. 2009-81513 (paragraphs [0035] to[0047], Fig. 1 and 2)

Summary of the INVENTION

TECHNICAL PROBLEM

Using LTE or LTE-advanced base stations can communicate with each other to transfer the service or control interference. The communication interface between base stations is established in the form of the X2 interface.

Fig. 17 illustrates the interfaces between the base stations. The 5a radio network includes a base station eNB0 - eNB4. Using the X2 interface in LTE base station connected to a wired way. In the case of Fig. 17. the base station eNB0 connects to �asulym stations eNB1 - eNB4 wired transmission lines with X2-1 X2-4, respectively.

For simplicity illustrates only the interfaces between the base station eNB0 and eNB1, between the base station eNB0 and eNB2, between the base station eNB0 and eNB3 and between the base station eNB0 and eNB4. In reality, however, each base station is connected to another base station. The result is a cellular connection.

When the base station eNB0 communicates with another base station, the base station eNB0 uses a wired connection in accordance with the X2 interface. For example, when the base station eNB0 communicates with the base station eNB1, the base station eNB0 uses conductive line X2-1 transmission. When the base station eNB0 communicates with base station eNB2, the base station eNB0 uses conductive line X2-2 transmission.

Typically, the interaction between the base stations based on the X2 interface is a wired way. However, if you enter the above relay station, which works exactly the same as base station, repeater station and the upper base station are connected via a radio link. As a result, distance pieces creates a radio communication based on the X2 interface.

Fig. 18 illustrates the interfaces between the base stations in the radio network, which includes the relay station. RA�ioset 5b includes a base station eNB0 on eNB4, relay station RN and the mobile station UE.

Relay station RN works exactly the same as a normal base station. In addition, there is an upper base station (base station eNB0), also called the donor, in relation to the relay station RN. Relay station RN is connected to the upper base station eNB0 along the line X2-5 radio. The mobile station UE is under control of the relay station RN.

Relay station RN communicates with the base stations eNB1 - eNB4 through the upper base station eNB0. Accordingly, not only wired the interaction, but also radio. For example, when the relay station RN communicates with the base station eNB1, used line X2-5 radio and wire line X2-1 transmission.

Fig. 19 is a sequence diagram of the handover. Transfer of service is indicated as an example of the communication between the relay station RN and the other base station. It is assumed that the mobile station UE under the control of a relay station in the radio network RN 5b performs the transfer, and that the possible assignments of transmission service are base stations eNB1 and eNB2.

(S101) When the mobile station UE performs transmission service, mob�price station UE measures the levels of reception of radio waves, transmitted from the surrounding base stations as a result of displacement, adds the measurement results in the alarm, called the report about the measurement, and transmits the alarm relay station RN.

(S102) When the relay station RN takes the results of measurement of the reception level, the relay station RN recognizes that the levels of reception of radio waves transmitted from base stations eNB1 and eNB2 are high, and that the base station eNB1 and eNB2 are possible assignments of transmission service. It is assumed that the relay station RN first transmits to the base station eNB1 HO request (signalling transfer request service). The HO request is transmitted to the base station eNB1 through the upper base station eNB0.

(S103) When the base station eNB1 receives the HO request, the base station eNB1 determines of their state of overflow, etc., is it possible to transfer service to the base station eNB1. If the transfer of servicing to the base station eNB1 is possible, the base station eNB1 HO returns OK (alarm permit transfer service). If the transfer of servicing to the base station eNB1 is impossible, the base station eNB1 returns fail HO (signaling transfer ban service). In this case, the base station eNB1 determines that the transfer service to the base station eNB1 is impossible, and to be repaid�secş ond relay station RN crashing HO. Fail HO is transmitted to relay station RN by means of the upper base station eNB0.

(S104) When the relay station RN accepts crashing HO from the base station eNB1, the relay station RN transmits the HO request base station eNB2, which is another possible assignment of transmission service. The HO request is transmitted to the base station eNB2 through the upper base station eNB0.

(S105) When the base station eNB2 receives the HO request, the base station eNB2 determines whether the transfer of servicing to the base station eNB2. If the transfer of servicing to the base station eNB2 is possible, the base station eNB2 returns HO OK relay station RN. HO OK is transmitted to relay station RN by means of the upper base station eNB0.

(S106) Relay station RN determines from the contents of the HO OK that base station eNB2 is the destination of the handover, and notify the mobile station UE by using the command HO (command transmission service). The mobile station UE then detects from the content of the HO team that the base station eNB2 is a base station of the destination of transmission service, and performs a transfer service to the base station eNB2.

When the relay station RN communicates with another base station, radio communication is performed along the line X2-5 radio transmission between retran�station circulating RN and the upper base station eNB0. However, if we consider interference from another station, interference to the other station, etc., it is desirable to reduce the amount of radiosignals along the line X2-5 radio. In other words, it is desirable that the amount of radiosignals transmitted between the relay station RN and the upper base station eNB0, or the number of times the radio alarm is transmitted between the relay station RN and the upper base station eNB0, was small.

However, in the above-mentioned sequence of transmission service transmission service is executed without regard to the amount of radiosignals. Accordingly, the radio alarm is often transmitted between the relay station RN and the upper base station eNB0 before is determined by the base station of the destination of transmission service.

As a result of increased volume of radiosignals along the line X2-5 radio programs, the level of interference from another station or interference to the other station is growing, and the communication quality deteriorates. In addition to radio communications, there is a long delay in the process, for example, the establishment of the radio link. Accordingly, if the radio communication is performed often, the latency increases.

In the above description of the transmission service is taken as an example. However, the same problem may occur when interacting in addition to transmission service�freeze between the relay station RN and the other base station.

The present invention was created to solve the aforementioned problem. The purpose of the present invention is to provide a radio system, which improves the communication quality by reducing the amount of radio communication between the relay station and the base station.

The solution to the PROBLEM

To solve the above problem, provided is a radio communication system. This radio communication system includes a first base station, the second base station and a relay station which is connected to the first base station by radio and which communicates with the second base station through the first base station.

Relay station requests the first base station to communicate with the second base station to relay station. Requested the first base station communicates with the second base station to relay station and transmits a result of the implementation of the connection to the relay station.

USEFUL RESULTS of the INVENTION

The communication quality can be improved by reducing the amount of radio communication between the relay station and the base station.

The above and other objectives, features and advantages of the present invention will become apparent from the following description in op�the Tanya with the accompanying drawings, that of example illustrate preferred embodiments of the present invention.

BRIEF description of the DRAWINGS

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

Fig. 2 illustrates an example of the structure of the relay station;

Fig. 3 illustrates an example of the structure of the upper base station;

Fig. 4 is a sequence diagram of the communication;

Fig. 5 illustrates an example of the structure of the relay station;

Fig. 6 is a sequence diagram of the communication;

Fig. 7 illustrates an example of the structure of the upper base station;

Fig. 8 is a sequence diagram of the communication;

Fig. 9 illustrates an example of the structure of a radio system;

Fig. 10 is a sequence diagram of the communication;

Fig. 11 illustrates an example of the structure of the relay station;

Fig. 12 illustrates an example of the structure of the upper base station;

Fig. 13 is a sequence diagram of the communication;

Fig. 14 illustrates an example of the structure of the relay station;

Fig. 15 illustrates an example of the structure of the upper base station;

Fig. 16 is a sequence diagram of the communication;

Fig. 17 illustrates the interfaces between the base stations;

Fig. 18 illustrates the interfaces between the base stations in radioset�, includes relay station; and

Fig. 19 is a sequence diagram of the handover.

DESCRIPTION of embodiments of

Below describes the options for implementation with reference to the drawings. Fig. 1 illustrates an example of the structure of a radio system. The radio communication system 1 includes the relay station 10, the upper base station 20 (base station), base stations 31 and 32 (second base station) and mobile station 2. Base stations 31 and 32 are connected to the upper base station 20 a wired way. Relay station 10 is connected to the upper base station 20 via the radio link and communicates with the base stations 31 and 32 through the upper base station 20.

When the repeater station 10 communicates with the base station 31 or 32, the relay station 10 requests the upper base station 20 to communicate with the base station 31 or 32 for the relay station 10. The upper base station 20, is requested to communicate with the base station 31 or 32 for the relay station 10 performs communication with the base station 31 or 32 for the relay station 10 and transmits the result of the implementation of the connection to the relay station 10. To communicate with the base station 31 or 32, the relay station 10 can W�to request from the upper base station 20 to perform communication with the base station 31 or 32 for the relay station 10, or may perform normal communication with the base station 31 or 32 without a request from the upper base station 20 to perform communication with the base station 31 or 32 for the relay station 10.

The structure and operation of relay station 10 and the upper base station 20 included in the Radiocommunication system 1, hereinafter described in more detail. Fig. 2 illustrates an example of the structure of the relay station. Fig. 2 indicates the function in relation to the processing of control information. Functions such as transmission and reception of data will be omitted.

Relay station 10 includes a control section 11 transmits and section 12 of the request for mediation. When the section 11 transmission control receives control information transmitted from mobile station 2, section 11, the transmission control determines whether the control information to create a request for mediation to the upper base station 20. If the management information is intended to create a request for mediation to the upper base station 20, section 11, the transmission control transmits control information in section 12 of the request for mediation. If the management information is not intended to create a request for mediation to the upper base station 20, section 11, the transmission control performs certain management of the transmission and sends the result to the mobile station 2 or the upper base station 20. In addition, when section 11 transmission control adopts operated�General information transferred from section 12 of the request for mediation or the upper base station 20, section 11, the transmission control performs certain management of the transmission and sends the result to the mobile station 2.

When the section 12 of the request for mediation receives the control information to create a request for mediation to the upper base station 20, section 12 of the request for mediation request forms of mediation, including the contents of control information, and passes the request to the mediation of the upper base station 20. In addition, when section 12 of the request for mediation receives a response from the mediation, which is the information regarding the request for mediation and which is transmitted from the upper base station 20, section 12 of the request for mediation forwards the response mediation in section 11 transmission control.

Fig. 3 illustrates an example of the structure of the upper base station 20. Fig. 3 indicates the function in relation to the processing of control information. Functions such as transmission and reception of data will be skipped. The upper base station 20 includes a control section 21 transmits and section 22 management mediation.

Control information that is transmitted from the relay station 10 and which is a request for mediation is transmitted to the control section 22 of the mediation. Justices�known information, which is transmitted from the relay station 10 and which is not a request for mediation is transmitted to the section 21 of the transmission control. Section 21 of the transmission control performs certain management for transmission of control information, which is not a request for mediation, and sends the result to the mobile station 2 or another base station. In addition, when section 21 of the transmission control receives control information transmitted from another base station (network comprising the base station 31, 32, etc.), section 21 transmission control performs certain management of the transmission and transmits the result of the relay station 10.

When section 22 of the management of the mediation receives the request for mediation is transmitted from the relay station 10, the control section 22 performs mediation mediation process with another base station, and transmits the result passed from her, a relay station 10 in response mediation.

Fig. 4 is a sequence diagram of the communication. When the repeater station 10 communicates with the base stations 31 and 32, the relay station 10 requests the upper base station 20 to perform the processes of communication to relay station 10 and the upper base station 20 transmits retranslate�the auditors of the station 10 results obtained by performing the processes of communication to relay station 10.

(S1) When the relay station 10 communicates with the base stations 31 and 32, the relay station 10 transmits it to the upper base station 20 a request for mediation (the alarm request mediation). When this relay station 10 requests the upper base station 20 to perform communication with the base stations 31 and 32 for the relay station 10.

(S2) When the upper base station 20 receives the request for mediation, the upper base station 20 from the contents of the request for mediation recognizes that the upper base station 20 communicates with the base stations 31 and 32. First, the upper base station 20 transmits a request (signaling request) base station 31.

(S3) When the base station 31 receives the request, the base station 31 performs a certain process and informs the upper base station 20 on the result with response (alarm response).

(S4) Upper base station 20 forwards the request to the base station 32.

(S5) When the base station 32 receives the request, base station 32 performs a certain process and informs the upper base station 20 on the result from the response.

(S6) When the upper base station 20 receives the responses transmitted from the base stations 31 and 32, the upper base �station 20 adds the contents of the answers in the answer of mediation (alarm response mediation) and forwards the response mediation relay station 10.

As described, when relay station 10 communicates with the base stations 31 and 32, the relay station 10 requests the upper base station 20 to perform the processes of communication to relay station 10. The upper base station 20 communicates with the base stations 31 and 32 for the relay station 10 and transmits the results of the processes of communication in the relay station 10. As a result, you can reduce the amount of radio communication between the relay station 10 and the upper base station 20.

The case where in the system 1 of the radio communication relay station 10 requests the upper base station 20 to perform a process of communication to relay station 10, will now be described with specific transmission control as an example. First will be described the control performed in the case where the relay station 10 requests the upper base station 20 to select the base station of the destination of transmission service at the time of transmission maintenance mobile station 2 under the control of relay station 10.

Fig. 5 illustrates an example of the structure of the relay station. The structure of the upper base station 20 is the same as in the upper base station 20 illustrated in Fig. 3. Relay station 10A includes a section 11-1 control per�summer house and section 12 of the request for mediation. Section 11-1 the transmission control includes the block 11a of the processing of transmission service.

When section 11-1 transmission control receives the measurement report transmitted from the mobile station 2, section 11-1 the transmission control detects that the mobile station 2 performs the transmission service. In addition to the ID of the mobile station 2, setup information for mobile station 2, etc., block 11a, the processing of transmission service transfers in section 12 of the request for mediation information about the measurement of the reception level included in the measurement report (the information that the mobile station 2 receives by measuring the levels of reception of radio waves transmitted from the surrounding base stations). Section 12 of the request for mediation generates a request for the mediation of request from the upper base station 20 to perform a process of transfer of servicing to a relay station 10A and passes the request to the mediation of the upper base station 20.

On the other hand, the upper base station 20 having the same structure as the upper base station 20 illustrated in Fig. 3, determines whether the management information transmitted from the relay station 10A, the conventional information, or request mediation. If the management information transmitted from the relay station 10A is a request for mediation,the request for mediation is transmitted to the control section 22 of the mediation. If the management information transmitted from the relay station 10a is not a request for mediation, then the control information is transmitted to the section 21 of the transmission control. When section 22 of the management of the mediation receives the request for mediation section 22 management mediation selects the destination of transmission service for relay station 10a and transmits information about the selected assignment of transmission service relay station 10a in response mediation.

Fig. 6 is a sequence diagram of the communication. When the mobile station 2 under the control of relay station 10a performs service transmission, relay station 10a requests the upper base station 20 to select the base station of the destination of transmission service.

(S11) When the mobile station 2 performs the transmission service, the mobile station 2 transmits the measurement report relay station 10a.

(S12) When the relay station 10a receives the measurement report, the relay station 10a recognizes that the mobile station 2 needs to perform the transfer service. Relay station 10a transmits a request for mediation and passes the request to the mediation of the upper base station 20. When this relay station 10a requests the upper base station 20 vol�lnit the process of transferring servicing to a relay station 10a.

The request for mediation includes status information for a mobile station 2. The status information corresponds to such information (context) about the state of the mobile station 2, mobile station ID and the baud rate, information about the measurement of the reception level included in the measurement report transmitted from the mobile station 2, etc.

(S13) When the upper base station 20 receives the request for mediation, the upper base station 20 recognizes that the levels of reception of radio waves transmitted from base stations 31 and 32 are high, and that the base stations 31 and 32 are possible assignments of transmission service. It is assumed that the upper base station 20 first transmits the HO request to the base station 31.

(S14) When the base station 31 receives the HO request, it is assumed that the base station 31 determines from his state of overflow, etc. that the transfer of servicing to the base station 31 is impossible. In this case, the base station 31 returns fail HO.

(S15) When the upper base station 20 receives the fail HO from the base station 31, the upper base station 20 transmits the HO request base station 32, which is another possible assignment of transmission service.

(S16) When the base station 32 receives the HO request, it is assumed that the base station 32 determines that the transfer service kvasovoy station 32 is possible. In this case, the base station 32 HO returns OK upper base station 20.

(S17) the Upper base station 20 determines from the contents of the HO OK that base station 32 is the destination of transmission service, and informs the relay station 10a of this result with the response of the mediation.

(S18) When the relay station 10a receives a response from the mediation, the relay station 10a recognizes that the base station of the destination of transmission service is a base station 32, and notifies the mobile station 2 using the command HO.

As indicated in Fig. 19, radio alarm is traditionally often passed between the relay station and the possible assignments of transmission service to determine the base station of the destination of transmission service. However, with the above control agent in the transfer of servicing relay station 10a at the time of transmission maintenance mobile station 2 requests the upper base station 20 to select a base station of destination. Relay station 10a receives the result from the upper base station 20 and informs the mobile station 2 about this result.

As a result, the radio alarm is exchanged between the relay station 10a and the upper base station 20, is supracompetitive and response mediation. Accordingly it is possible to reduce the amount of radio communication between the relay station 10A and the upper base station 20.

If there is a possibility that the number of times of exchange of radio alarm with a possible assignment of transmission service is small, for example, if only information about the measurement of the reception level for a single base station included in the measurement report transmitted from the mobile station 2, the relay station 10a can determine that the relay station 10a performs control mediation. If the relay station 10a determines that it is not necessary to request from the upper base station 20 perform a process of a handover to a relay station 10a, the relay station 10a can perform normal transmission process of the service type indicated in Fig. 19.

The following describes the control performed in the case where the status information for a mobile station 2, for example information about the measurement of the reception level in advance is transmitted to a relay station, and where is the transfer service.

Fig. 7 illustrates an example of the structure of the upper base station. The structure of the relay station is the same as the relay station 10a illustrated in Fig. 5. The upper base station 20a includes a control section 21 re�task and section 22-1 management mediation. Moreover, the section 22-1 management mediation includes unit 22a for storing information about the condition.

When the relay station 10a having the same structure as the relay station 10a illustrated in Fig. 5, receives the measurement report from the mobile station 2, the relay station 10a retrieves information about the measurement of the reception level included in the measurement report. Section 12 of the request for mediation adds information about the measurement of the reception level to the request for mediation and passes the request to the mediation of the upper base station 20a.

On the other hand, when the upper base station 20a receives the request for mediation is transmitted from the relay station 10a, section 22-1 management mediation retrieves information about the measurement of the reception level, and stores the information about the measurement of the reception level in the block 22a storing information about the state. Section 22-1 management mediation then selects the destination of transmission service for relay station 10a on the basis of information about the measurement of the reception level, and transmits information about the selected assignment of transmission service relay station 10a in response mediation.

Fig. 8 is a sequence diagram of the communication. Information about the measurement of the reception level, the mobile station obtains by measuring, in advance is transmitted to a relay station 10a. After that, the transfer of service.

(S21a) the Mobile station 2 transmits the measurement information of the reception relay station 10a is a report about the measurements.

(S21b) When the relay station 10a receives the measurement report, the relay station 10a transmits the measurement report of the upper base station 20a. The upper base station 20a retrieves and stores information about the measurement of the reception level included in the measurement report.

(S22a) the Mobile station 2 continues to move, and measures the levels of reception of radio waves transmitted from base stations, in the new location to which you moved the mobile station 2. The mobile station 2 then transmits the new information about the measurement of the reception level again relay station 10a is a report about the measurements.

(S22b) When the relay station 10a receives the measurement report, the relay station 10a transmits the measurement report of the upper base station 20a. The upper base station 20a retrieves and stores information about the measurement of the reception level included in the measurement report, and updates the information about the measurement of the reception level.

(S23) the transmission of the request for mediation to the upper base station 20a relay station 10a requests the upper base article�nciu 20a to execute the process of transfer of servicing to a relay station 10a. Information about the measurement of the reception level is not included in the request for mediation. Accordingly, the amount of information included in the request for mediation, small compared to the amount of information included in the request for mediation, formed in the above step S12.

(S24) the Upper base station 20a recognizes from the information about the measurement of the reception level of which the upper base station 20a has already informed via the inspection report that the levels of reception of radio waves transmitted from base stations 31 and 32 are high, and that the base stations 31 and 32 are possible assignments of transmission service. When the upper base station 20a receives the request for mediation, the upper base station 20a detects that the mobile station 2 should perform service transmission, and transmits the HO request to the base station 31.

(S25) When the base station 31 receives the HO request, the base station 31 determines from his state of overflow, etc. that the transfer of servicing to the base station 31 is impossible, and returns a failure HO.

(S26) When the upper base station 20A receives the fail HO from the base station 31, the upper base station 20A transmits the HO request base station 32, which is another possible assignment of transmission service.

(S27) When the base station 32 receives the HO request, the base station�I 32 determines the transfer service to the base station 32 is possible, and returns HO OK upper base station 20a.

(S28) the Upper base station 20A determines from the contents of the HO OK that base station 32 is the destination of transmission service, and informs the relay station 10a of this result with the response of the mediation.

(S29) When the relay station 10a receives a response from the mediation, the relay station 10a recognizes that the base station of the destination of transmission service is a base station 32, and notifies the mobile station 2 using the command HO.

As described, the relay station 10a informs the upper base station 20a information about the measurement of the reception level, which relay station 10a is informed with a report about the measurements transmitted from mobile station 2 under the control of relay station 10a. The upper base station 20a stores the information about the measurement of the reception level.

When the mobile station 2 performs a service transmission, relay station 10a requests the upper base station 20a through the request for mediation to perform service transmission for a relay station 10a. Information about the measurement of the reception level is not included in the request for mediation. Accordingly, you can further reduce�ü the volume of the radio. Besides relay station 10a may request from the upper base station 20a in a short period of time to perform service transmission for a relay station 10a. As a result it is possible to reduce the delay caused by the transmission process of the service.

In the above description status information for the mobile station 2 is information about the measurement of the reception level. The mobile station 2 in advance informs the relay station 10a information about the measurement of the reception level by using the inspection report. However, the measurement report may include the ID of the mobile station, the transmission speed, etc. in addition to the information about the measurement of the reception level. Accordingly, the mobile station 2 may also advance to inform the relay station 10a on the ID of the mobile station, transmission speed, etc. with this inspection report. It is possible to further reduce the amount of information included in the request for mediation.

The following describes the control performed in the case where possible destinations include the relay station and where the upper base station to relay station transmits the request for transmission service to the base station.

Fig. 9 illustrates an example of the structure of a radio system. System 1a radio includes with�BOJ upper base station 20-1 (first base station), the base station 33 (second base station), relay stations 10-1 and 10-2 and the mobile station 2. The upper base station 20-1 and the base station 33 are connected by radio. Relay station 10-1 and 10-2 are connected to the upper base station 20-1 radio. Moreover, the mobile station 2 is under the control of the base station 33.

System 1a radio has the structure described above. When the base station 33 on the basis of the inspection report from the mobile station 2 detects that the mobile station 2 should perform service transmission, the base station 33 selects the base station of the destination of transmission service. It is assumed that the possible assignments of transmission service are relay stations 10-1 and 10-2. Base station 33 requests the upper base station 20-1 to the relay stations 10-1 and 10-2 perform the process of transferring servicing to the base station 33.

Fig. 10 is a sequence diagram of the communication. If possible destinations include relay stations 10-1 and 10-2, the upper base station 20-1 to the relay stations 10-1 and 10-2 transmits a request for handover to the base station 33.

(S31) When the mobile station 2 performs the transmission service, the mobile station 2 transmits to the base �rtation 33 information about the measurement of the reception level by using the inspection report.

(S32) When the base station 33 receives the measurement report, the base station 33 recognizes that the mobile station 2 needs to perform the transfer service. Base station 33 transmits a request for mediation and passes the request to the mediation of the upper base station 20-1. Meanwhile, the base station 33 requests the upper base station 20-1 to perform the process of handoffs to base stations 33.

(S33) When the upper base station 20-1 receives the request for mediation, the upper base station 20-1 on the basis of information about the measurement of the reception level included in the request for mediation, recognizes that the levels of reception of radio waves transmitted from the relay stations 10-1 and 10-2, are high, and that relay station 10-1 and 10-2 are the possible assignments of transmission service. It is assumed that the upper base station 20-1 first transmits the HO request to the relay station 10-1.

(S34) When the relay station 10-1 receives the HO request, it is assumed that the relay station 10-1 determines of their state of overflow, etc. that the transfer of servicing to a relay station 10-1 is impossible. In this case, the relay station 10-1 returns fail HO upper base station 20-1.

(S35) When the upper base station 20-1 receives a failure from HO relay station 10-1, the top �Azova station 20-1 transmits the HO request relay station 10-2, which is another possible assignment of transmission service.

(S36) When the relay station 10-2 receives the HO request, it is assumed that the relay station 10-2 determines that the transfer of servicing to a relay station 10-2 is possible. In this case, the relay station 10-2 HO returns OK upper base station 20-1.

(S37) the Upper base station 20-1 determines from the contents of the HO OK that relay station 10-2 is the destination of transmission service, and informs the base station about 33 this result with the response of the mediation.

(S38) When the base station 33 receives a response from the mediation, the base station 33 recognizes that the base station of the destination of transmission service is a relay station 10-2, and notifies the mobile station 2 using the command HO.

As a result of the selection system described above 1a radio, you can reduce the amount of radio communication between the base station 33 and the upper base station 20-1.

Now will be described the control performed in the case where the upper base station according to the interference value measured by the relay station other station to relay station and receives a report on the amount of interference from the other station to relay station. The base station shall communicate the terms p�fur, in order to control interference. As a result relay station also informs the other station interference value and adopts a report on the amount of interference from another station.

Accordingly, the magnitude of interference is transmitted or received by radio by means of the upper base station. The same occurs with the transfer of servicing. In the case of transmission control regarding transmission and reception of the magnitude of interference of the upper base station transmits and receives the value of the interference relay station. The volume of radio communication between the relay station and the upper base station is reduced.

Fig. 11 illustrates an example of the structure of the relay station. Fig. 12 illustrates an example of the structure of the upper base station. Relay station 10b includes a section 11-2 transmission control and section 12 of the request for mediation. Section 11-2 transmission control includes a unit 11b of the processing of information about the magnitude of the interference. The upper base station 20b includes a control section 21 transmits and section 22-2 management mediation. Section 22-2 management mediation includes unit 22b processing information about the magnitude of the interference.

Unit 11b of the processing of information about the magnitude of the interference in the relay station 10b measures and records the amount of interference relay station 10b � conveys information about the magnitude of interference in section 12 of the request for mediation. Section 12 of the request for mediation adds information about the magnitude of noise in the request for mediation and informs the upper base station 20b on information about the magnitude of the interference. Unit 22b processing information about the magnitude of noise included in section 22-2 management mediation in the upper base station 20b, informed relay station 10b information about the magnitude of interference, informs the surrounding base station about information on the amount of interference relay station 10b. In addition, the block 22b processing information about the magnitude of interference summarizes information about the amount of noise transmitted from the surrounding base stations, and section 22-2 management mediation transmits the result of summation of the relay station 10b.

Fig. 13 is a sequence diagram of the communication. The upper base station 20b according to the magnitude of the interference relay station 10b to the other station to relay station 10b and receives a report on the amount of interference from the other station to relay station 10b.

(S41) to request from the upper base station 20b to provide information on the amount of interference to the other station to relay station 10b and adopt the report information on the amount of interference from the other station to relay station 10b, the relay station 10b transmits the request for mediation upper base camp�AI 20b. The request for mediation includes information about the magnitude of interference (information about the magnitude of interference on the side of the relay station), the received relay station 10b by measurement.

(S42) the Upper base station 20b receives the request for mediation. The upper base station 20b transmits the report request the base station 31, to request the base station 31 to provide information about the magnitude of interference (information about the magnitude of interference at the base station), the received base station 31 by measurement. The inquiry report also includes information on the amount of interference relay station 10b. The upper base station 20b informs the base station 31 information about the amount of interference relay station 10b.

(S43) When the base station 31 receives the report request, the base station 31 adds information about the magnitude of interference to the base station 31 in the report about noise and returns a report about interference of the upper base station 20b.

(S44) the Upper base station 20b transmits the report request the base station 32 to request the base station 32 to provide information on the amount of interference received by the base station 32 by measurement. The inquiry report also includes information on the amount of interference relay station 10b. The upper base station 20b informs the base station 32 information in�the guise of interference relay station 10b.

(S45) When the base station 32 receives a report request, the base station 32 adds information about the magnitude of interference for the base station 32 in the report about noise and returns a report about interference of the upper base station 20b.

(S46) the Upper base station 20b informs the relay station 10b information about the magnitude of interference to base stations 31 and 32 with the response mediation.

As described, the relay station 10b requests the upper base station 20b to communicate to each base station information about the amount of interference received by relay station 10b by measurement, or to collect information on the amount of interference received by each base station by measuring. You can reduce the amount of radio communication between the relay station 10b and the upper base station 20b.

The information on the amount of interference may be reported if a predetermined condition. Alternatively, the information on the amount of interference may be reported periodically. In these cases, the upper base station 20b stores the information about the amount of noise transmitted from other base stations. When the relay station 10b requests the upper base station 20b to collect information on the amount of interference relay station 10b, the upper base station 20b informs the relay station 10b information about the magnitude of the interference, the cat�Rui keeps the upper base station 20b.

The following describes the control performed in the case where multiple base stations jointly transmit data to a mobile station, and where the upper base station informs the set of base stations information of planning regarding the transfer of data to multiple base stations.

In LTE-advanced application of the method is discussed CoMP (Coordinated multipoint transmission and reception), with which the base station jointly transmit data to the mobile station.

Using CoMP Central base station performs scheduling for data transmission. Other base station transmits in accordance with the information planning. If the Central base station is a relay station, and relay station transmits the scheduling information for each base station through the upper base station, the radio volume increases. Therefore, to reduce the amount of radio communication between the relay station and the upper base station, the upper base station informs each base station information planning for relay station.

Fig. 14 illustrates an example of the structure of the relay station. Fig. 15 illustrates an example of the structure of the upper base station. Relay station 10c includes the section 11-3 transmission control and section 12 of the request posledn�quality. Section 11-3 transmission control includes a unit 11c of information processing planning. The upper base station 20c includes the section 21-3 transmission control and section 22 management mediation. Section 21-3 transmission control includes a block 21c of information processing planning.

Unit 11c processing scheduling information in a relay station 10c performs scheduling and transmits the scheduling information for in section 12 of the request for mediation. Section 12 of the request for mediation adds information planning in the request for mediation and informs the upper base station 20c of the request for mediation.

Section 22 management mediation in the upper base station 20c receives the request for mediation, extracts information planning from the request for mediation and transmits the scheduling information for the block 21c processing scheduling information included in section 21-3 of the transmission control. Moreover, the section 22 management mediation transmits the scheduling information for the base stations 31 and 32. Unit 21c processing scheduling information included in the section 21-3 transmission control, sets the planning information in the upper base station 20c.

Fig. 16 is a sequence diagram of the communication. Relay station 10c performs the CoMP to the mobile station 2 under the control�of the relay station 10c.

(S51) Relay station 10c performs scheduling for data transmission of the mobile station 2 using CoMP forms and information planning, including the timing of data transmission. Relay station 10c then use request mediation requests the upper base station 20c to inform the base station 31 and 32 information about planning for relay station 10c. The request for mediation includes information planning.

(S52) When the upper base station 20c receives the request for mediation, the upper base station 20c extracts information planning and informs the base stations 31 and 32 of the planning information.

(S53) In accordance with the scheduling information for the relay station 10c, the upper base station 20c and the base station 31 and 32 transmit data to mobile station 2.

As described, when data are transmitted to mobile station 2 using the CoMP, the upper base station 20c informs the base stations information of planning regarding the transfer of data to a relay station 10c. You can reduce the amount of radio communication between the relay station 10c and the upper base station 20c.

As described above, by using the system 1 of the radio communication relay station 10 requests the upper base station 20 to communicate with the base stations 31 and 32 d�I relay station 10, and requested the upper base station 20 communicates with the base stations 31 and 32 for the relay station 10. The upper base station 20 transmits the result of the implementation of the communication relay station 10.

As a result reduces the amount of radio communication between the relay station 10 and the upper base station 20. This gives the possibility of reducing interference from another station or with her, or decrease latency. Accordingly, it is possible to improve the quality of communication.

The foregoing is intended only as an explanation of the principles of the present invention. Furthermore, since numerous modifications and changes can easily be done by experts in the art, is not required to limit the invention shown and described the exact structure and applications, and accordingly all suitable modifications and equivalents may be considered outside the scope of the invention in the appended claims and its equivalents.

LIST of LINKS

1 radio system

2 mobile station

10 repeater station

20 upper base station (first base station)

31, 32, the base station (second base station)

1. Radio communication method used in a radio communication system including the first base station, the second base station, �otara communicates with the first base station, relay station which communicates with the second base station via the first base station and a mobile station, wherein the method contains
the transfer request via a second base station for requesting the first base station to communicate with the relay station to the second base station; and
the implementation of the connection requested by the first base station from the relay station to the second base station, and transmitting the result of the communication to the second base station.

2. A method according to claim 1, further comprising;
transmitting, by the first base station, control information to a mobile station in accordance with the reception result of the communication from the second base station, and
reception of control information by the mobile station.

3. Radio communication method used by the first base station, which is connected via a radio relay station through which communication is performed between the relay station and the second base station, wherein the method contains
the reception of the request transmitted from the second base station, for requesting the first base station to communicate with the relay station as the Deputy� to the second base station;
communication with the relay station to the second base station in accordance with the reception of the request; and
the result of the communication to the second base station.

4. Radio communication method used by the second base station that communicates with the relay station via the first base station, wherein the method contains
the transmission request to the first base station for requesting the first base station to communicate with the relay station as a Deputy to the second base station.



 

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