KR100966614B1

KR100966614B1 - Wireless communication system with multiple antenna and method thereof

Info

Publication number: KR100966614B1
Application number: KR1020080008482A
Authority: KR
Inventors: 이병옥; 권호중; 김동명; 이광복
Original assignee: 재단법인서울대학교산학협력재단
Priority date: 2008-01-28
Filing date: 2008-01-28
Publication date: 2010-06-29
Also published as: KR20090082618A

Abstract

본 발명은 무선 이동 통신 환경에서 복수의 안테나를 가지고 있는 이동국과 기지국의 통신 방법으로, 더욱 상세하게는 이동국이 복수의 안테나를 이용해서 복수의 기지국과 통신하는 방법 및 복수의 안테나를 이용한 핸드오프 방법에 관한 것이다. 본 발명에 의해서 이동국은 복수의 안테나를 이용해서 네트워크와 효율적으로 통신을 수행할 수 있고, 핸드오프 시에 발생하는 지연시간과 패킷 로스를 줄일 수 있다.The present invention is a communication method of a mobile station and a base station having a plurality of antennas in a wireless mobile communication environment, and more particularly, a method for a mobile station to communicate with a plurality of base stations using a plurality of antennas and a handoff method using a plurality of antennas. It is about. According to the present invention, the mobile station can efficiently communicate with the network using a plurality of antennas, and can reduce delay time and packet loss occurring at the time of handoff.

무선이동통신, 다중 안테나, 핸드오프, 제어국, 홈 에이전트 Wireless Mobile Communications, Multiple Antennas, Handoff, Control Station, Home Agent

Description

Wireless communication system using multiple antennas and its communication method {Wireless communication system with multiple antenna and method

본 발명은 무선이동통신 환경에서 복수의 안테나를 가지고 있는 이동국 및 기지국을 포함하는 무선이동통신 시스템의 통신 방법에 관한 것으로, 더욱 상세하게는 복수의 안테나를 가지고 있는 이동국이 복수의 기지국과 통신하는 방법 및 복수의 안테나를 이용한 핸드오프 방법에 관한 것이다.The present invention relates to a communication method of a wireless mobile communication system including a mobile station and a base station having a plurality of antennas in a wireless mobile communication environment, and more particularly, a method in which a mobile station having a plurality of antennas communicates with a plurality of base stations. And a handoff method using a plurality of antennas.

다중 안테나 기술은 다수의 안테나를 전송단 및 수신단에 설치하고 그것들을 활용함으로써, 무선 통신 시스템의 데이터 전송율과 신뢰도를 높일 수 있게 해준다. 하지만, 종래 대부분의 안테나 기술은 이동국(Mobile Station:MS)이 하나의 기지국(Radio Access Station:RAS)과 통신하는 환경을 가정하였다. 본 발명에서는 이동국이 복수의 안테나를 이용해서 복수의 기지국과 통신하는 방법을 제시한다.Multi-antenna technology enables the installation of multiple antennas at the transmit and receive ends and utilize them to increase the data rate and reliability of wireless communication systems. However, most of the conventional antenna technologies assume an environment in which a mobile station (MS) communicates with one base station (Radio Access Station: RAS). The present invention provides a method for a mobile station to communicate with a plurality of base stations using a plurality of antennas.

종래 핸드오프 기술은 하드 핸드오프(Hard handoff)와 소프트 핸드오프 (Soft handoff)기술로 나뉜다. 하드 핸드오프 기술은 기존의 통신을 수행하던 기지국과 통신을 끊은 후에 새로운 기지국과 통신을 수행하는 방법으로서, 다중 접속 방식에 상관없이 사용 가능하지만, 핸드오프 시에 발생하는 지연 시간이 길다는 단 점이 있다. 소프트 핸드오프 기술은 기존에 통신을 수행하던 기지국과 통신을 끊기 전에 기존의 기지국 및 새로운 기지국과 동시에 통신을 수행함으로써 핸드오프 시에 발생하는 지연 시간을 줄인다. 하지만, 종래 소프트 핸드오프 기술은 CDMA를 기반으로 한 시스템에서만 가능하다는 제약 조건이 있다.Conventional handoff techniques are divided into hard handoff and soft handoff techniques. Hard handoff technology is a method of communicating with a new base station after disconnecting from an existing base station, and can be used regardless of a multiple access method. However, a hard handoff technique has a long delay in handoff. have. Soft handoff technology reduces the delay time during handoff by communicating with the existing base station and the new base station at the same time before disconnecting from the existing base station. However, there is a limitation that the conventional soft handoff technique is possible only in a system based on CDMA.

본 발명은 무선이동통신 환경에서 이동국이 복수의 안테나를 이용해서 복수의 기지국과 통신하는 방법을 제공한다. 또한, 핸드오프 시에 발생하는 지연시간과 패킷로스를 줄이되 다중 접속 방식에 상관없이 모든 시스템에 적용할 수 있는 핸드오프 방법을 제공하는 것을 목적으로 한다.The present invention provides a method for a mobile station to communicate with a plurality of base stations using a plurality of antennas in a wireless mobile communication environment. Another object of the present invention is to provide a handoff method that can reduce delay time and packet loss occurring during handoff but can be applied to all systems regardless of a multiple access method.

본 발명의 다중 안테나를 이용한 무선 통신 시스템은, 복수의 안테나를 갖는 이동국과 제1기지국 및 제2기지국을 포함하는 무선통신 시스템에 있어서, 이동국은, 제1기지국과 통신을 하다가, 제2기지국과의 링크연결 요청에 의해서 제1기지국과 통신을 하면서 동시에 복수의 안테나를 이용해서 제2기지국과 링크연결되고, 제1기지국과의 연결해제 요청에 의해서 제2기지국과 통신하는 것을 특징으로 한다.In a wireless communication system using a multiple antenna of the present invention, a wireless communication system including a mobile station having a plurality of antennas, a first base station and a second base station, the mobile station communicates with the first base station, The first base station communicates with the base station by a link connection request at the same time and is connected to the second base station by using a plurality of antennas, characterized in that the communication with the second base station by the disconnection request with the first base station.

특히, 제2기지국과의 링크연결 요청은, 설정된 조건을 만족하면 이동국이 제2기지국에게 요청하는 것이 바람직하다. In particular, the link connection request with the second base station is preferably requested by the mobile station to the second base station if the set condition is satisfied.

또한, 제2기지국과의 링크연결 요청은, 설정된 조건을 만족하면 이동국이 제1기지국에게 요청하는 것이 바람직하다.In addition, the link connection request with the second base station is preferably requested by the mobile station to the first base station when the set condition is satisfied.

또한, 제2기지국과의 링크연결 요청은, 설정된 조건을 만족하면 제1기지국이 제2기지국에게 요청하는 것이 바람직하다.In addition, it is preferable that the first base station requests the second base station for the link connection request with the second base station.

또한, 제2기지국과의 링크연결 요청은, 설정된 조건을 만족하면 제2기지국이 이동국에게 요청하는 것이 바람직하다.In addition, it is preferable that the request for link connection with the second base station is made by the second base station to the mobile station if the set condition is satisfied.

또한, 설정된 조건은, 이동국과 제1기지국 간의 채널상태, 이동국과 제2기지국 간의 채널상태, 제1기지국으로부터 이동국으로 도달하는 신호의 세기, 제2기지국으로부터 이동국으로 도달하는 신호의 세기, 이동국과 제1기지국 간의 거리, 이동국과 제2기지국 간의 거리, 제1기지국의 트래픽 로드, 제2기지국의 트래픽 로드, BER(bit error rate), FER(frame error rate), 및 간섭신호의 크기 중 하나 이상에 기초하여 설정되는 것이 바람직하다.In addition, the set conditions include the channel state between the mobile station and the first base station, the channel state between the mobile station and the second base station, the strength of the signal reaching the mobile station from the first base station, the strength of the signal reaching the mobile station from the second base station, and the mobile station. At least one of the distance between the first base station, the distance between the mobile station and the second base station, the traffic load of the first base station, the traffic load of the second base station, the bit error rate (BER), the frame error rate (FER), and the magnitude of the interference signal. It is preferable to set based on.

또한, 이동국이 제2기지국과 링크연결된 상태에서, 제2기지국은 이동국에게 제어메시지를 전송하는 것이 바람직하다.Further, in the state where the mobile station is linked with the second base station, the second base station preferably transmits a control message to the mobile station.

또한, 제어메시지는, 핸드오프와 관련된 정보, 제2기지국의 트래픽 로드 정보, 제2기지국의 간섭정보, 및 이동국과 제2기지국 간의 채널정보 중 하나 이상 포함하고 있는 것이 바람직하다.Preferably, the control message includes at least one of information related to handoff, traffic load information of the second base station, interference information of the second base station, and channel information between the mobile station and the second base station.

또한, 이동국이 제2기지국과 링크연결된 상태에서, 제1기지국 및 제2기지국은 다이버시티 모드(diversity mode)를 이용하여 신호를 전송하는 것이 바람직하다.Further, in a state in which the mobile station is linked with the second base station, it is preferable that the first base station and the second base station transmit signals using a diversity mode.

또한, 이동국이 제2기지국과 링크연결된 상태에서, 제1기지국 및 제2기지국은 멀티플렉싱 모드(multiplexing mode)를 이용하여 신호를 전송하는 것이 바람직하다.Further, in a state where the mobile station is linked with the second base station, it is preferable that the first base station and the second base station transmit signals using a multiplexing mode.

또한, 이동국이 제2기지국과 링크연결된 상태에서, 이동국은 제2기지국에게 제어메시지를 전송하는 것이 바람직하다.Further, with the mobile station linked with the second base station, the mobile station preferably transmits a control message to the second base station.

또한, 이동국이 제2기지국과 링크연결된 상태에서, 이동국은 제1기지국에게 전송하는 데이터와 서로 다른 데이터를 제2기지국에게 전송하는 것이 바람직하다.Further, while the mobile station is linked with the second base station, the mobile station preferably transmits data different from the data transmitted to the first base station to the second base station.

또한, 이동국이 제2기지국과 링크연결된 상태에서, 이동국은 제1기지국에게 전송하는 데이터와 동일한 데이터를 제2기지국에게 전송하는 것이 바람직하다.Further, in the state where the mobile station is linked with the second base station, the mobile station preferably transmits the same data to the second base station as the data transmitted to the first base station.

또한, 이동국이 제2기지국과 링크연결된 상태에서, 이동국은 다이버시티 모드(diversity mode)를 이용하여 제1기지국 및 제2기지국에게 신호를 전송하는 것이 바람직하다.Further, in the state where the mobile station is linked with the second base station, the mobile station preferably transmits a signal to the first base station and the second base station by using a diversity mode.

또한, 이동국이 제2기지국과 링크연결된 상태에서, 이동국은 멀티플렉싱 모드(multiplexing mode)를 이용하여 제1기지국 및 제2기지국에게 신호를 전송하는 것이 바람직하다.Further, in a state where the mobile station is linked with the second base station, the mobile station preferably transmits a signal to the first base station and the second base station using a multiplexing mode.

또한, 제2기지국은 제1기지국과 서로 같은 무선통신네트워크의 기지국인 것이 바람직하다. Further, the second base station is preferably a base station of the same wireless communication network as the first base station.

또한, 제2기지국은 제1기지국과 서로 다른 무선통신네트워크의 기지국인 것이 바람직하다.Further, the second base station is preferably a base station of a wireless communication network different from the first base station.

또한, 이동국이 제2기지국과 링크연결된 상태에서, 제2기지국은 제1기지국이 이동국에게 전송하는 데이터와 서로 다른 데이터를 이동국에게 전송하는 것이 바람직하다.Further, while the mobile station is linked with the second base station, the second base station preferably transmits data different from the data transmitted by the first base station to the mobile station.

또한, 제2기지국 및 제2기지국을 제어하는 제어국을 더 포함하되, 제어국은 이동국에게 전송할 데이터를 제1기지국을 통해서 전송할 데이터와 제2기지국을 통해서 전송할 데이터로 나누어서, 제1기지국 및 제2기지국에게 서로 다른 데이터를 전달해주는 것이 바람직하다.The apparatus may further include a control station for controlling the second base station and the second base station, wherein the control station divides data to be transmitted to the mobile station into data to be transmitted through the first base station and data to be transmitted through the second base station. It is desirable to pass different data to the two base stations.

또한, 이동국이 제2기지국과 연결된 상태에서, 제2기지국은 제1기지국이 이동국에게 전송하는 데이터와 동일한 데이터를 이동국에게 전송하는 것이 바람직하다.Also, with the mobile station connected to the second base station, the second base station preferably transmits the same data to the mobile station that the first base station transmits to the mobile station.

또한, 제1기지국 및 제2기지국을 제어하는 제어국을 더 포함하고, 제어국은 이동국에게 전송할 데이터를 복사하여 제1기지국 및 제2기지국에게 동일한 데이터를 전달해주는 것이 바람직하다.Further, the control station further comprises a control station for controlling the first base station and the second base station, and the control station preferably copies the data to be transmitted to the mobile station and delivers the same data to the first base station and the second base station.

또한, 제1기지국 및 제2기지국과 IP 코어 네트워크를 통해 연결되는 홈 에이전트(Home agent)를 더 포함하고, 이동국이 제1기지국과 통신하고 있는 상태에서, 홈 에이전트는, 이동국이 제1기지국의 네트워크로부터 할당받은 제1위치정보를 저장하고, 이동국에게 전송할 IP 패킷을 제1위치정보로 전달해주는 것이 바람직하다.The apparatus may further include a home agent connected to the first base station and the second base station through an IP core network, and in a state where the mobile station communicates with the first base station, the home agent may be a mobile station of the first base station. It is preferable to store the first location information allocated from the network and deliver the IP packet to be transmitted to the mobile station as the first location information.

또한, 제1기지국 및 제2기지국과 IP 코어 네트워크를 통해 연결되는 홈 에이전트(Home agent)를 더 포함하고, 이동국이 제2기지국과 링크연결된 상태에서, 홈 에이전트는, 이동국이 제1기지국의 네트워크로부터 할당받은 제1위치정보와 제2기지국의 네트워크로부터 할당받은 제2위치정보를 저장하는 것이 바람직하다.The apparatus may further include a home agent connected to the first base station and the second base station through an IP core network, and in a state in which the mobile station is connected to the second base station, the home agent may be a network of the first base station. It is preferable to store the first location information allocated from the second location information allocated from the network of the second base station.

또한, 홈 에이전트는, 이동국에게 전송할 데이터를 제1기지국을 통해서 전송할 제1데이터와 제2기지국을 통해서 전송할 제2데이터로 나누고, 제1데이터와 제1위치정보를 기초로 만들어진 IP 패킷을 제1위치정보로 전달하고, 제2데이터와 제2위치정보를 기초로 만들어진 IP 패킷을 제2위치정보로 전달하는 것이 바람직하다.Also, the home agent divides data to be transmitted to the mobile station into first data to be transmitted through the first base station and second data to be transmitted through the second base station, and divides the IP packet generated based on the first data and the first location information. It is preferable to transmit the location information, and to deliver the IP packet generated based on the second data and the second location information as the second location information.

또한, 홈 에이전트는, 이동국에게 전송할 데이터를 복사하여 복사한 데이터와 제1위치정보를 기초로 만들어진 IP 패킷을 제1위치정보로 전달하고, 복사한 데 이터와 제2위치정보를 기초로 만들어진 IP 패킷을 제2위치정보로 전달하는 것이 바람직하다.In addition, the home agent transfers the IP packet created based on the copied data and the first location information to the first location information by copying the data to be transmitted to the mobile station, and the IP created based on the copied data and the second location information. It is preferable to forward the packet to the second location information.

한편, 본 발명에 따른 다중 안테나를 이용한 무선통신 방법은, 복수의 안테나를 갖는 이동국과 제1기지국 및 제2기지국을 포함하는 무선통신 시스템에서 다중 안테나를 이용한 무선통신 방법으로서, 이동국이 제1기지국과 통신하는 단계; 제2기지국과의 링크연결 요청에 의해 이동국이 복수의 안테나를 이용하여 제1기지국과 통신하면서 제2기지국과 링크연결되는 단계; 및 제1기지국과의 연결해제 요청에 의해 이동국이 제2기지국과 통신하는 단계를 포함한다.Meanwhile, a wireless communication method using multiple antennas according to the present invention is a wireless communication method using multiple antennas in a wireless communication system including a mobile station having a plurality of antennas and a first base station and a second base station, wherein the mobile station is a first base station. Communicating with; Linking the mobile station with the second base station by communicating with the first base station using a plurality of antennas by a link connection request with the second base station; And the mobile station communicating with the second base station in response to the disconnection request with the first base station.

특히, 제2기지국과의 링크연결 요청은, 설정된 조건을 만족하면 이동국이 제2기지국에게 요청하는 것이 바람직하다.In particular, the link connection request with the second base station is preferably requested by the mobile station to the second base station if the set condition is satisfied.

또한, 설정된 조건은, 이동국과 제1기지국 간의 채널상태, 이동국과 제2기지국 간의 채널상태, 제1기지국으로부터 이동국으로 도달하는 신호의 세기, 제2기지국으로부터 이동국으로 도달하는 신호의 세기, 이동국과 제1기지국 간의 거리, 이 동국과 제2기지국 간의 거리, 제1기지국의 트래픽 로드, 제2기지국의 트래픽 로드, BER (bit error rate), FER (frame error rate), 및 간섭신호의 크기 중 하나 이상에 기초하여 설정되는 것이 바람직하다.In addition, the set conditions include the channel state between the mobile station and the first base station, the channel state between the mobile station and the second base station, the strength of the signal reaching the mobile station from the first base station, the strength of the signal reaching the mobile station from the second base station, and the mobile station. One of the distance between the first base station, the distance between the mobile station and the second base station, the traffic load of the first base station, the traffic load of the second base station, the bit error rate (BER), the frame error rate (FER), and the magnitude of the interference signal. It is preferable to set based on the above.

또한, 이동국이 제2기지국과 링크연결된 상태에서, 제2기지국이 이동국에게 제어메시지를 전송하는 단계를 더 포함하는 것이 바람직하다.In addition, it is preferable that the second base station further transmits a control message to the mobile station while the mobile station is in linkage with the second base station.

또한, 이동국이 제2기지국과 링크연결된 상태에서, 제1기지국 및 제2기지국이 다이버시티 모드(diversity mode)를 이용하여 신호를 전송하는 것이 바람직하다.In addition, it is preferable that the first base station and the second base station transmit signals using a diversity mode while the mobile station is linked with the second base station.

또한, 이동국이 제2기지국과 링크연결된 상태에서, 제1기지국 및 제2기지국이 멀티플렉싱 모드(multiplexing mode)를 이용해서 신호를 전송하는 것이 바람직하다.In addition, it is preferable that the first base station and the second base station transmit signals using a multiplexing mode while the mobile station is linked with the second base station.

또한, 이동국이 제2기지국과 링크연결된 상태에서, 이동국이 제2기지국에게 제어메시지를 전송하는 단계를 더 포함하는 것이 바람직하다.In addition, it is preferable that the mobile station further includes the step of sending a control message to the second base station while the mobile station is in linkage with the second base station.

또한, 이동국이 제2기지국과 링크연결된 상태에서, 이동국이 제1기지국에게 전송하는 데이터와 서로 다른 데이터를 제2기지국에게 전송하는 단계를 더 포함하는 것이 바람직하다.The method may further include transmitting data different from the data transmitted by the mobile station to the first base station to the second base station while the mobile station is linked with the second base station.

또한, 이동국이 제2기지국과 링크연결된 상태에서, 이동국이 제1기지국에게 전송하는 데이터와 동일한 데이터를 제2기지국에게 전송하는 단계를 더 포함하는 것이 바람직하다.In addition, it is preferable to further include transmitting, to the second base station, the same data that the mobile station transmits to the first base station while the mobile station is in linkage with the second base station.

또한, 이동국이 제2기지국과 링크연결된 상태에서, 이동국이 다이버시티 모드(diversity mode)를 이용하여 제1기지국 및 제2기지국에게 신호를 전송하는 것이 바람직하다.In addition, it is preferable that the mobile station transmits a signal to the first base station and the second base station by using a diversity mode while the mobile station is linked with the second base station.

또한, 이동국이 제2기지국과 링크연결된 상태에서, 이동국이 멀티플렉싱 모드(multiplexing mode)를 이용하여 제1기지국 및 제2기지국에게 신호를 전송하는 것이 바람직하다.In addition, it is preferable that the mobile station transmits a signal to the first base station and the second base station using a multiplexing mode while the mobile station is linked with the second base station.

또한, 이동국이 제2기지국과 링크연결된 상태에서, 제2기지국은 제1기지국이 이동국에게 전송하는 데이터와 서로 다른 데이터를 이동국에게 전송하는 단계를 더 포함하는 것이 바람직하다.Further, in a state in which the mobile station is linked with the second base station, the second base station preferably further includes transmitting data different from the data transmitted by the first base station to the mobile station.

또한, 제어국이 이동국에게 전송할 데이터를 제1기지국을 통해서 전송할 데이터와 제2기지국을 통해서 전송할 데이터로 나누어서, 제1기지국 및 제2기지국에게 서로 다른 데이터를 전달해주는 것이 바람직하다.In addition, it is preferable that the control station divides data to be transmitted to the mobile station into data to be transmitted through the first base station and data to be transmitted through the second base station, and delivers different data to the first base station and the second base station.

또한, 이동국이 제2기지국과 연결된 상태에서, 제2기지국은 제1기지국이 이동국에게 전송하는 데이터와 동일한 데이터를 이동국에게 전송하는 단계를 더 포함하는 것이 바람직하다.Further, in a state where the mobile station is connected with the second base station, the second base station preferably further includes transmitting to the mobile station the same data that the first base station transmits to the mobile station.

또한, 제어국이 이동국에게 전송할 데이터를 복사하여 제1기지국 및 제2기지국에게 동일한 데이터를 전달해주는 것이 바람직하다.In addition, it is preferable that the control station copies the data to be transmitted to the mobile station and delivers the same data to the first base station and the second base station.

또한, 이동국이 제1기지국과 통신하고 있는 상태에서, 홈 에이전트가, 이동 국이 제1기지국의 네트워크로부터 할당받은 제1위치정보를 저장하는 단계; 및 홈 에이전트가, 이동국에게 전송할 IP 패킷을 제1위치정보로 전달해주는 단계를 더 포함하는 것이 바람직하다.In addition, when the mobile station is in communication with the first base station, the home agent stores the first location information allocated by the mobile station from the network of the first base station; And forwarding, by the home agent, the IP packet to be transmitted to the mobile station as the first location information.

또한, 이동국이 제2기지국과 링크연결된 상태에서, 홈 에이전트가, 이동국이 제1기지국의 네트워크로부터 할당받은 제1위치정보와 제2기지국의 네트워크로부터 할당받은 제2위치정보를 저장하는 단계; 홈 에이전트가, 이동국에게 전송할 데이터를 제1기지국을 통해서 전송할 제1데이터와 제2기지국을 통해서 전송할 제2데이터로 나누는 단계; 홈 에이전트가, 제1데이터와 제1위치정보를 기초로 만들어진 IP 패킷을 제1위치정보로 전달하는 단계; 및 홈 에이전트가, 제2데이터와 제2위치정보를 기초로 만들어진 IP 패킷을 제2위치정보로 전달하는 단계를 더 포함하는 것이 바람직하다.The method may further include: storing, by the home agent, the first location information allocated by the mobile station from the network of the first base station and the second location information allocated from the network of the second base station, while the mobile station is linked with the second base station; Dividing, by the home agent, data to be transmitted to the mobile station into first data to be transmitted through the first base station and second data to be transmitted through the second base station; Transmitting, by the home agent, the IP packet generated based on the first data and the first location information to the first location information; And forwarding, by the home agent, the IP packet generated based on the second data and the second location information to the second location information.

또한, 이동국이 제2기지국과 링크연결된 상태에서, 홈 에이전트가, 이동국이 제1기지국의 네트워크로부터 할당받은 제1위치정보와 제2기지국의 네트워크로부터 할당받은 제2위치정보를 저장하는 단계; 홈 에이전트가, 이동국에게 전송할 데이터를 복사하는 단계; 홈 에이전트가, 복사한 데이터와 제1위치정보를 기초로 만들어진 IP 패킷을 제1위치정보로 전달하는 단계; 및 홈 에이전트가, 복사한 데이터와 제2위치정보를 기초로 만들어진 IP 패킷을 제2위치정보로 전달하는 단계를 더 포함하는 것이 바람직하다.The method may further include: storing, by the home agent, the first location information allocated by the mobile station from the network of the first base station and the second location information allocated from the network of the second base station, while the mobile station is linked with the second base station; Copying, by the home agent, data to be sent to the mobile station; Transmitting, by the home agent, the IP packet made based on the copied data and the first location information to the first location information; And forwarding, by the home agent, the IP packet made based on the copied data and the second location information to the second location information.

이상에서와 같이 본 발명에 따르면 다음과 같은 효과가 있다. According to the present invention as described above has the following effects.

무선이동통신 환경에서 이동국이 복수의 안테나를 이용해서 복수의 기지국과 효율적으로 통신하는 방법을 제공한다.Provided is a method for a mobile station to efficiently communicate with a plurality of base stations using a plurality of antennas in a wireless mobile communication environment.

또한, 핸드오프 시에 발생하는 지연시간과 패킷로스를 줄이되 다중 접속 방식에 상관없이 모든 시스템에 적용할 수 있는 핸드오프 방법을 제공한다.In addition, the present invention provides a handoff method that can be applied to all systems regardless of multiple access schemes while reducing delay time and packet loss occurring during handoff.

본 발명을 첨부된 도면을 참조하여 상세히 설명하면 다음과 같다. 여기서 동일한 구성에 대해서는 동일부호를 사용하며, 반복되는 설명, 본 발명의 요지를 불필요하게 흐릴 수 있는 공지 기능 및 구성에 대한 상세한 설명은 생략한다. 본 발명의 실시형태는 당업자에게 본 발명을 보다 완전하게 설명하기 위해서 제공되는 것이다. 따라서, 도면에서의 요소들의 형상 및 크기 등은 보다 명확한 설명을 위해 과장될 수 있다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. The same reference numerals are used for the same components, and repeated descriptions and detailed descriptions of well-known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted. Embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art. Accordingly, the shape and size of elements in the drawings may be exaggerated for clarity.

먼저, 이하 본 발명의 다중 안테나를 이용한 무선통신 시스템을 설명하기 위한 도면에서 이동국 및 기지국에 네 개의 안테나가 있는 것으로 도시하였으나, 이는 이해를 돕기 위한 것이고, 안테나의 수가 이에 한정되는 것은 아니다. 또한, 도면에 두 개의 기지국만 있는 것으로 도시하였으나, 이는 이해를 돕기 위한 것이고, 본 발명에 따른 무선이동통신 시스템에는 복수의 기지국이 존재한다.First, in the drawings for explaining a wireless communication system using multiple antennas according to the present invention, the mobile station and the base station have four antennas, but this is for understanding and the number of antennas is not limited thereto. In addition, although only two base stations are shown in the drawing, this is for ease of understanding, and there are a plurality of base stations in the wireless mobile communication system according to the present invention.

도 1은 본 발명의 제 1실시예에 따른 다중 안테나를 이용한 무선통신 시스템을 설명하기 위한 도면이다.1 is a view for explaining a wireless communication system using multiple antennas according to a first embodiment of the present invention.

도 1에 도시한 바와 같이, 본 발명의 제 1실시예에 따른 다중 안테나를 이용한 무선통신 시스템은, 크게 복수의 안테나를 갖는 이동국(110), 이동국(110)과 무선으로 연결되는 복수의 안테나를 기지국(120a,120b), 기지국(120a, 120b)과 연결되어 기지국(120a, 120b)을 제어하는 제어국(Access Control Router:ACR)(140)으로 이루어진다. 무선통신환경에서 이동국(110)은 기지국(120a, 120b)과 무선통신을 수행한다.As shown in FIG. 1, a wireless communication system using multiple antennas according to a first embodiment of the present invention includes a mobile station 110 having a plurality of antennas and a plurality of antennas wirelessly connected to the mobile station 110. An access control router (ACR) 140 is connected to the base stations 120a and 120b and the base stations 120a and 120b to control the base stations 120a and 120b. In the wireless communication environment, the mobile station 110 performs wireless communication with the base stations 120a and 120b.

본 발명의 1실시예에 따른 다중 안테나를 이용한 무선통신 시스템에서 제2기지국(120b)은 제1기지국(120a)과 서로 같은 무선통신네트워크(예컨대, WCDMA HSDPA, 와이브로, 무선랜 등)의 기지국 또는 서로 다른 무선통신네트워크의 기지국으로 구축될 수 있다. In a wireless communication system using multiple antennas according to an embodiment of the present invention, the second base station 120b may be a base station of a same wireless communication network (eg, WCDMA HSDPA, WiBro, WLAN, etc.) as the first base station 120a. It can be constructed as a base station of different wireless communication networks.

도 2는 본 발명에 따른 다중 안테나를 이용한 무선통신 시스템에서의 통신방법을 개략적으로 설명하기 위한 도면이다.2 is a diagram schematically illustrating a communication method in a wireless communication system using multiple antennas according to the present invention.

먼저, 이동국(110)은 현재 제1기지국(120a)과 통신하고 있는 것으로 가정한다(S10). 이동국(110)은 설정된 조건을 만족할 경우, 제2기지국(120b)과의 링크연결을 요청하고(S20), 이에 따라, 이동국(110)은 제2기지국(120b)과 링크연결된다. 상기한 조건은 이동국(110)과 제1기지국(120a) 간의 채널상태, 이동국(110)과 제2기지국(120b) 간의 채널상태, 제1기지국(120a)으로부터 이동국(110)으로 도달하는 신호의 세기, 제2기지국(120a)으로부터 이동국(110)으로 도달하는 신호의 세기, 이동국(110)과 제1기지국(120a) 간의 거리, 이동국(110)과 제2기지국(120b) 간의 거 리, 제1기지국(120a)의 트래픽 로드, 제2기지국(120b)의 트래픽 로드, BER(bit error rate), FER(frame error rate), 및 간섭신호의 크기 중 하나 이상에 기초하여 설정될 수 있다. First, it is assumed that the mobile station 110 is currently communicating with the first base station 120a (S10). When the mobile station 110 satisfies the set condition, the mobile station 110 requests a link connection with the second base station 120b (S20). Accordingly, the mobile station 110 is linked with the second base station 120b. The above conditions are based on the channel state between the mobile station 110 and the first base station 120a, the channel state between the mobile station 110 and the second base station 120b, and the signal reaching the mobile station 110 from the first base station 120a. Strength, the strength of the signal reaching the mobile station 110 from the second base station 120a, the distance between the mobile station 110 and the first base station 120a, the distance between the mobile station 110 and the second base station 120b, and The traffic load of the first base station 120a, the traffic load of the second base station 120b, a bit error rate (BER), a frame error rate (FER), and the magnitude of the interference signal may be set.

제2기지국(120b)과의 링크연결 요청에 따라 이동국(110)이 제2기지국(120b)과 링크연결되는 과정에 대해서는 도 3 내지 도 6을 참조하여 자세히 설명하기로 한다.A process of linking the mobile station 110 with the second base station 120b in response to a link connection request with the second base station 120b will be described in detail with reference to FIGS. 3 to 6.

한편, 제2기지국(120b)과의 링크연결 요청에 의해서 이동국(110)은 복수의 안테나를 이용하여 제1기지국(120a)과 통신하면서 제2기지국(120b)과 링크연결을 유지한다(S30). 이동국(110)이 복수의 안테나를 이용하여 제1기지국(120a)과 통신하면서 제2기지국(120b)과는 링크연결을 유지하고 있는 상태에서 이동국(110)과 제1기지국(120a) 간의 연결해제가 요청되는 경우(S45), 이동국(110)과 제1기지국(120a) 간의 연결은 해제되고, 이동국(110)은 제2기지국(120b)과만 통신하게 된다(S55). 반대로, 이동국(110)이 복수의 안테나를 이용하여 제1기지국(120a)과 통신하면서 제2기지국(120b)과는 링크연결을 유지하고 있는 상태에서 이동국(110)과 제2기지국(120b) 간의 연결해제가 요청되는 경우(S40), 이동국(110)과 제2기지국(120b) 간의 링크연결은 해제되고, 이동국(110)은 제1기지국(120a)과만 통신하게 된다(S50).Meanwhile, in response to a link connection request with the second base station 120b, the mobile station 110 maintains a link connection with the second base station 120b while communicating with the first base station 120a using a plurality of antennas (S30). . The mobile station 110 disconnects between the mobile station 110 and the first base station 120a while the mobile station 110 communicates with the first base station 120a using a plurality of antennas and maintains a link connection with the second base station 120b. If requested (S45), the connection between the mobile station 110 and the first base station 120a is released, and the mobile station 110 only communicates with the second base station 120b (S55). On the contrary, the mobile station 110 communicates with the first base station 120a using a plurality of antennas and maintains a link connection with the second base station 120b while the mobile station 110 communicates with the second base station 120b. When disconnection is requested (S40), the link connection between the mobile station 110 and the second base station 120b is released, and the mobile station 110 only communicates with the first base station 120a (S50).

이하에서는, 도 2의 S20 단계에서 이동국(110)과 제2기지국(120b)의 링크연결 요청에 따라 이동국(110)과 제2기지국(120b)의 링크연결되는 과정에 대해 실시 예를 들어 자세히 설명하기로 한다. Hereinafter, a process of linking the mobile station 110 and the second base station 120b according to the link connection request of the mobile station 110 and the second base station 120b in step S20 of FIG. 2 will be described in detail. Let's do it.

(1 실시예)(Example 1)

도 3은 본 발명의 제 1실시예에 따른 다중 안테나를 이용한 무선통신 시스템에서 이동국과 제2기지국이 링크연결되는 1 실시예에 따른 방법을 설명하기 위한 도면이다.3 is a diagram illustrating a method according to an embodiment in which a mobile station and a second base station are linked by a wireless communication system using multiple antennas according to a first embodiment of the present invention.

먼저, 이동국(110)은 현재 제1기지국(120a)과 통신하고 있는 것으로 가정한다(S100). 이동국(110)이 설정된 조건을 만족할 경우(S110), 이동국(110)은 제2기지국(120b)에 링크연결을 요청하고(S120), 이에 따라, 제2기지국(120b)은 이동국(110)과의 링크연결을 수락한다(S130). 그리고, 제2기지국(120b)은 제어국(140)에 이동국(110)과 링크연결되었음을 통보한다(S140). 이때, 상기한 조건은 도 2에서 전술한 바와 같은 조건으로 설정될 수 있다.First, it is assumed that the mobile station 110 is currently communicating with the first base station 120a (S100). When the mobile station 110 satisfies the set condition (S110), the mobile station 110 requests a link connection to the second base station 120b (S120), and accordingly, the second base station 120b is connected to the mobile station 110. Accept the link connection (S130). Then, the second base station 120b notifies the control station 140 that the mobile station 110 has been linked with the mobile station 110 (S140). In this case, the condition may be set to the condition described above with reference to FIG. 2.

한편, 상기한 조건을 만족하면 이동국(110)은 복수의 안테나를 이용하여 제1기지국(120a)과 통신하면서 제2기지국(120b)과 링크연결을 유지한다(S150). Meanwhile, if the above condition is satisfied, the mobile station 110 maintains a link connection with the second base station 120b while communicating with the first base station 120a using a plurality of antennas (S150).

(2 실시예)(Example 2)

도 4는 본 발명의 제 1실시예에 따른 다중 안테나를 이용한 무선통신 시스템에서 이동국과 제2기지국이 링크연결되는 2 실시예에 따른 방법을 설명하기 위한 도면이다.4 is a view for explaining a method according to the second embodiment in which a mobile station and a second base station are linked by a wireless communication system using multiple antennas according to a first embodiment of the present invention.

먼저, 이동국(110)은 현재 제1기지국(120a)과 통신하고 있는 것으로 가정한다(S200). 이동국(110)은 설정된 조건을 만족할 경우(S210), 이동국(110)은 제1기 지국(120a)에 제2기지국(120b)과의 링크연결을 요청하고(S215), 상기 요청에 따라, 제1기지국(120a)은 이동국(110)과 제2기지국(120b) 간의 링크연결을 제어국(140)에 요청한다(S220). 이때, 상기한 조건은 도 2에서 전술한 바와 같은 조건으로 설정될 수 있다.First, it is assumed that the mobile station 110 is currently communicating with the first base station 120a (S200). When the mobile station 110 satisfies the set condition (S210), the mobile station 110 requests the first base station 120a to link with the second base station 120b (S215), and according to the request, The first base station 120a requests the control station 140 for a link connection between the mobile station 110 and the second base station 120b (S220). In this case, the condition may be set to the condition described above with reference to FIG. 2.

제어국(140)은 이동국(110)과 제2기지국(120b) 간의 링크연결 요청을 제2기지국(120b)에 전달한다(S230). 그리고, 제2기지국(120b)은 이를 입력받아 이동국(110)과의 링크연결을 수락하고, 이에 따른 신호를 제어국(140)으로 전송한다(S240). 제어국(140)은 제2기지국(120b)으로부터 전송되는 신호에 기초하여 제1기지국(120a)에 이동국(110)과 제2기지국(120b) 간의 링크연결을 수락한다(S250). 이어, 제1기지국(120a)은 이동국(110)과 제2기지국(120b) 간의 링크연결을 수락하고(S260), 최종적으로 복수의 안테나를 이용하여 제1기지국(120a)과 통신하면서 제2기지국(120b)과 링크연결을 유지한다(S270).The control station 140 transmits a link connection request between the mobile station 110 and the second base station 120b to the second base station 120b (S230). Then, the second base station 120b receives this, accepts the link connection with the mobile station 110, and transmits a signal according to the control station 140 (S240). The control station 140 accepts the link connection between the mobile station 110 and the second base station 120b to the first base station 120a based on the signal transmitted from the second base station 120b (S250). Subsequently, the first base station 120a accepts the link connection between the mobile station 110 and the second base station 120b (S260), and finally communicates with the first base station 120a by using a plurality of antennas, and the second base station. Maintain a link connection with (120b) (S270).

(3 실시예)(3 Examples)

도 5는 본 발명의 제 1실시예에 따른 다중 안테나를 이용한 무선통신 시스템에서 이동국과 제2기지국이 링크연결되는 3 실시예에 따른 방법을 설명하기 위한 도면이다.FIG. 5 is a diagram for describing a method according to a third embodiment in which a mobile station and a second base station are linked in a wireless communication system using multiple antennas according to a first embodiment of the present invention.

먼저, 이동국(110)은 현재 제1기지국(120a)과 통신하고 있는 것으로 가정한다(S300). 제1기지국(120a)은 설정된 조건을 만족할 경우(S310), 제1기지국(120a)은 제어국(140)에 이동국(110)과 제2기지국(120b) 간의 링크연결을 요청한 다(S320). 상기 요청에 따라, 제어국(140)은 제2기지국(120b)에 이동국(110)과의 링크연결을 요청한다(S330). 이때, 상기한 조건은 도 2에서 전술한 바와 같은 조건으로 설정될 수 있다. 제2기지국(120b)은 제어국(140)으로부터의 요청에 따라 이동국(110)과의 링크연결을 수락하고 이에 따른 신호를 제어국(140)으로 전송한다(S340). 제어국(140)은 제2기지국(120b)으로부터 전송되는 신호에 기초하여 이동국(110)과 제2기지국(120b) 간의 링크연결을 수락한다(S350). 그리고, 제1기지국(120a)은 이동국(110)과 제2기지국(120b) 간의 링크연결을 통보함으로써 최종적으로 이동국(110)은 복수의 안테나를 이용하여 제1기지국(120a)과 통신하되 제2기지국(120b)과 링크연결을 유지한다(S360, S370). First, it is assumed that the mobile station 110 is currently communicating with the first base station 120a (S300). When the first base station 120a satisfies the set condition (S310), the first base station 120a requests the control station 140 for link connection between the mobile station 110 and the second base station 120b (S320). In response to the request, the control station 140 requests the second base station 120b to link with the mobile station 110 (S330). In this case, the condition may be set to the condition described above with reference to FIG. 2. The second base station 120b accepts the link connection with the mobile station 110 in response to a request from the control station 140 and transmits a signal to the control station 140 (S340). The control station 140 accepts the link connection between the mobile station 110 and the second base station 120b based on the signal transmitted from the second base station 120b (S350). In addition, the first base station 120a notifies the link connection between the mobile station 110 and the second base station 120b so that the mobile station 110 finally communicates with the first base station 120a using a plurality of antennas. Maintain a link connection with the base station 120b (S360, S370).

(4 실시예)(4 Examples)

도 6은 본 발명의 제 1실시예에 따른 다중 안테나를 이용한 무선통신 시스템에서 이동국과 제2기지국이 링크연결되는 4 실시예에 따른 방법을 설명하기 위한 도면이다.FIG. 6 is a diagram for describing a method according to example 4 in which a mobile station and a second base station are linked in a wireless communication system using multiple antennas according to a first embodiment of the present invention.

먼저, 이동국(110)은 현재 제1기지국(120a)과 통신하고 있는 것으로 가정한다(S400). 제2기지국(120b)이 설정된 조건을 만족할 경우(S410), 제2기지국(120b)은 이동국(110)에 링크연결을 요청하고, 이에 따라, 이동국(110)은 제2기지국(120b)과의 링크연결을 수락한다. 그리고, 제2기지국(120b)은 제어국(140)에 이동국(110)과 링크연결되었음을 통보한다. 이때, 상기한 조건은 도 2에서 전술한 바와 같은 조건으로 설정될 수 있다.First, it is assumed that the mobile station 110 is currently communicating with the first base station 120a (S400). When the second base station 120b satisfies the set condition (S410), the second base station 120b requests the mobile station 110 to connect to the link, and thus, the mobile station 110 connects with the second base station 120b. Accept the link connection. Then, the second base station 120b notifies the control station 140 that the mobile station 110 has been linked. In this case, the condition may be set to the condition described above with reference to FIG. 2.

한편, 상기한 조건을 만족하면 이동국(110)은 복수의 안테나를 이용하여 제1기지국(120a)과 통신하면서 제2기지국(120b)과 링크연결을 유지한다(S225). Meanwhile, if the above condition is satisfied, the mobile station 110 maintains a link connection with the second base station 120b while communicating with the first base station 120a using a plurality of antennas (S225).

이하에서는, 도 2의 S30 단계에서의 통신방법을 설명하기로 한다. 즉, 이동국(110)이 복수의 안테나를 이용하여 제1기지국(120a)과 통신하면서 제2기지국(120b)과 링크연결을 유지한 상태에서 이동국(110)과 제2기지국(120b) 간의 통신방법에 대해 설명하기로 한다.Hereinafter, the communication method in step S30 of FIG. 2 will be described. That is, the mobile station 110 communicates with the first base station 120a using a plurality of antennas while maintaining a link connection with the second base station 120b, and the communication method between the mobile station 110 and the second base station 120b. This will be described.

이동국(110)이 복수의 안테나를 이용하여 제1기지국(120a)과 통신하면서 제2기지국(120b)과 링크연결된 상태에서, 제2기지국(120b)은 이동국(110)과 통신하기 위해 필요한 제어메시지(Control message)를 이동국(110)에 전송할 수 있다. 물론, 그 역(이동국(110)이 제2기지국(120b)과 통신하기 위해 필요한 제어메시지를 제2기지국(120b)에 전송하는 경우)도 가능하다. 상기한 제어메시지에는 핸드오프와 관련된 정보, 제2기지국(120b)의 트래픽 로드(Traffic load) 정보, 제2기지국(120b)의 간섭정보, 및 이동국(110)과 제2기지국(120b) 간의 채널정보 중 하나 이상이 포함될 수 있다. 물론, 제어메시지에 포함되는 정보가 상기한 정보들에 국한되는 것은 아니며 통신 시스템 및 통신 환경 등에 따라 다른 정보들이 포함될 수도 있다.While the mobile station 110 is connected to the second base station 120b while communicating with the first base station 120a using a plurality of antennas, the second base station 120b requires a control message for communicating with the mobile station 110. (Control message) can be transmitted to the mobile station (110). Of course, the reverse (when the mobile station 110 transmits a control message necessary for communicating with the second base station 120b) to the second base station 120b. The control message includes information related to handoff, traffic load information of the second base station 120b, interference information of the second base station 120b, and a channel between the mobile station 110 and the second base station 120b. One or more of the information may be included. Of course, the information included in the control message is not limited to the above information, and other information may be included according to a communication system and a communication environment.

한편, 전술한 상태(즉, 이동국(110)이 복수의 안테나를 이용하여 제1기지국(120a)과 통신하면서 제2기지국(120b)과 링크연결된 상태)에서 제2기지국(120b)은 이동국(110)과 통신할 수 있다. 보다 상세하게는, 제1기지국(120a) 및 제2기지 국(120b)은 복수의 안테나를 이용해서 동시에 이동국(110)에게 데이터를 전송할 수 있고, 이동국(110)은 복수의 안테나를 이용해서 동시에 제1기지국(120a) 및 제2기지국(120b)에게 데이터를 전송할 수 있다. On the other hand, in the above state (ie, the mobile station 110 is connected to the second base station 120b while communicating with the first base station 120a using a plurality of antennas), the second base station 120b is the mobile station 110. ) Can be communicated with. More specifically, the first base station 120a and the second base station 120b may simultaneously transmit data to the mobile station 110 using a plurality of antennas, and the mobile station 110 may simultaneously use a plurality of antennas. Data may be transmitted to the first base station 120a and the second base station 120b.

이때, 제 1기지국(120a) 및 제 2기지국(120b)은, 복수의 안테나를 이용해서 한 개의 데이터 스트림을 이동국(110)으로 전송하거나(diversity mode), 복수의 안테나를 이용해서 복수의 데이터 스트림을 이동국(110)으로 전송할 수 있다(multiplexing mode). 이때, 이동국(110)이 복수의 안테나를 이용하여 제 1기지국(120a) 및 제 2기지국(120b)로부터 데이터를 수신할 때 전술한 바와 같은 선형 수신기 또는 비선형 수신기를 사용할 수 있다.At this time, the first base station 120a and the second base station 120b transmit one data stream to the mobile station 110 using a plurality of antennas (diversity mode) or a plurality of data streams using a plurality of antennas. May be transmitted to the mobile station 110 (multiplexing mode). In this case, when the mobile station 110 receives data from the first base station 120a and the second base station 120b using a plurality of antennas, the linear receiver or the non-linear receiver as described above may be used.

업링크(uplink)의 경우도 마찬가지로, 이동국(110)이, 복수의 안테나를 이용해서 제1기지국(120a) 및 제2기지국(120b)에게 한 개의 데이터 스트림을 전송하거나(diversity mode), 복수의 안테나를 이용해서 제1기지국(120a) 및 제2기지국(120b)에게 복수의 데이터 스트림을 전송할 수 있다(multiplexing mode). 그리고, 제 1기지국(120a) 및 제 2기지국(120b)이 복수의 안테나를 이용하여 이동국(110)으로부터 데이터를 수신할 때 전술한 바와 같은 선형 수신기 또는 비선형 수신기를 사용할 수 있다.Similarly in the case of uplink, the mobile station 110 transmits one data stream to the first base station 120a and the second base station 120b using a plurality of antennas, or a plurality of antennas. A plurality of data streams may be transmitted to the first base station 120a and the second base station 120b using an antenna (multiplexing mode). In addition, when the first base station 120a and the second base station 120b receive data from the mobile station 110 using a plurality of antennas, a linear receiver or a nonlinear receiver as described above may be used.

한편, 제1기지국(120a) 및 제2기지국(120b)이 복수의 안테나를 이용해서 동시에 이동국(110)과 통신할 때, 제1기지국(120a) 및 제2기지국(120b)은 서로 동일한 데이터를 이동국(110)에 전송할 수 있다. 이 경우 이동국(110)은 동일한 데이터를 제1기지국(120a) 및 제2기지국(120b)에서 수신하기 때문에 다이버시티 이 득(diversity gain)을 얻을 수 있다. 보다 상세하게는, 제어국(140)은 이동국(110)에게 전송할 데이터를 복사하여 제1기지국(120a) 및 제2기지국(120b)에게 동일한 데이터를 전달해줌으로써 이동국(110)은 제1기지국(120a) 및 제2기지국(120b)로부터 동일한 데이터를 전송받게 된다. 물론, 그 역(이동국(110)이 제1기지국(120a) 및 제2기지국(120b)에 동일한 데이터를 전송하는 경우)도 가능하다.On the other hand, when the first base station 120a and the second base station 120b communicate with the mobile station 110 at the same time using a plurality of antennas, the first base station 120a and the second base station 120b share the same data. May transmit to the mobile station 110. In this case, since the mobile station 110 receives the same data from the first base station 120a and the second base station 120b, it is possible to obtain diversity gain. More specifically, the control station 140 copies the data to be transmitted to the mobile station 110 and transfers the same data to the first base station 120a and the second base station 120b, thereby allowing the mobile station 110 to display the first base station 120a. ) And second base station 120b receive the same data. Of course, the reverse (when the mobile station 110 transmits the same data to the first base station 120a and the second base station 120b) is also possible.

또한, 제1기지국(120a) 및 제2기지국(120b)이 복수의 안테나를 이용해서 동시에 이동국(110)과 통신할 때, 제1기지국(120a) 및 제2기지국(120b)은 서로 다른 데이터를 이동국(110)에 전송할 수 있고, 이러한 경우 데이터의 전송율을 높일 수 있다. 보다 상세하게는, 제어국(140)은 이동국(110)에게 전송할 데이터를 제1기지국(120a)을 통해서 전송할 데이터와 제2기지국(120b)를 통해서 전송할 데이터로 나누어서, 제1기지국(120a) 및 제2기지국(120b)에게 서로 다른 데이터를 전송한다. 물론, 그 역(이동국(110)이 제1기지국(120a) 및 제2기지국(120b)에 서로 다른 데이터를 전송하는 경우)도 가능하다.In addition, when the first base station 120a and the second base station 120b communicate with the mobile station 110 at the same time using a plurality of antennas, the first base station 120a and the second base station 120b transmit different data. It can transmit to the mobile station 110, in which case it is possible to increase the data transmission rate. More specifically, the control station 140 divides the data to be transmitted to the mobile station 110 into data to be transmitted through the first base station 120a and data to be transmitted through the second base station 120b, and thus, the first base station 120a and Different data is transmitted to the second base station 120b. Of course, the reverse (when the mobile station 110 transmits different data to the first base station 120a and the second base station 120b) is also possible.

도 7은 본 발명의 제 2실시예에 따른 다중 안테나를 이용한 무선통신 시스템을 설명하기 위한 도면이다.7 is a diagram for describing a wireless communication system using multiple antennas according to a second embodiment of the present invention.

도 7에 도시한 바와 같이, 본 발명의 제 4실시예에 따른 다중 안테나를 이용한 무선통신 시스템은, 크게 복수의 안테나를 갖는 이동국(110), 이동국(110)과 무선으로 연결되는 복수의 안테나를 갖는 기지국(120a,120b), 기지국(120a, 120b)과 IP 코어 네트워크(IP core Network, 150)를 통해 연결되는 홈 에이전트(Home Agent:HA)(160)로 이루어진다. 무선통신환경에서 이동국(110)은 기지국(120a, 120b)과 무선통신을 수행한다.As shown in FIG. 7, a wireless communication system using multiple antennas according to a fourth embodiment of the present invention includes a mobile station 110 having a plurality of antennas and a plurality of antennas wirelessly connected to the mobile station 110. It comprises a base station (120a, 120b) having a home agent (HA) (160) connected to the base station (120a, 120b) and the IP core network (IP core network, 150). In the wireless communication environment, the mobile station 110 performs wireless communication with the base stations 120a and 120b.

이동국(110)은 기지국(120a, 120b)의 네트워크로부터 위치정보(COA:Care Of Address)를 할당받는다. 이동국(110)이 제1기지국(120a)과 링크연결되어 있을 때에는 제1기지국(120a)의 네트워크으로부터 제1위치정보(제1기지국의 COA)를 할당받고, 이동국(110)이 제2기지국(120b)과 링크연결되어 있을 때에는 제2기지국(120b)의 네트워크로부터 제2위치정보(제2기지국의 COA)를 할당받는다.The mobile station 110 is assigned location information (COA) from a network of base stations 120a and 120b. When the mobile station 110 is linked with the first base station 120a, the first location information (COA of the first base station) is allocated from the network of the first base station 120a, and the mobile station 110 receives the second base station ( 120b), the second location information (COA of the second base station) is allocated from the network of the second base station 120b.

홈 에이전트(160)는 현재 이동국(110)에 할당되어 있는 위치정보를 저장하고 있다. 홈 에이전트(160)에게 이동국(110)으로 향하는 IP 패킷(packet)이 도착하면, 홈 에이전트(160)는 해당 IP 패킷을 현재 이동국(110)에 할당되어 있는 위치정보로 전달해준다. 이때, 홈 에이전트(160)는, 이동국(110)이 제1기지국(120a)과 통신하고 있는 상태에서, 이동국(110)이 제1기지국(120a)의 네트워크로부터 할당받은 제1위치정보를 저장하고, 이동국(110)에게 전송할 IP 패킷을 제1위치정보로 전달해준다. The home agent 160 stores location information currently assigned to the mobile station 110. When the home packet 160 arrives at the IP packet directed to the mobile station 110, the home agent 160 delivers the IP packet to the location information currently assigned to the mobile station 110. At this time, the home agent 160 stores the first location information allocated by the mobile station 110 from the network of the first base station 120a while the mobile station 110 is in communication with the first base station 120a. In addition, the mobile station 110 transmits the IP packet to be transmitted to the first location information.

이동국(110)이 제1기지국(120a) 및 제2기지국(120b)과 링크연결되어 있을 때에는 홈 에이전트(160)는 이동국(110)이 제1기지국(120a)의 네트워크로부터 할당받은 제1위치정보와 이동국(110)이 제2기지국(120b)의 네트워크로부터 할당받은 제2위치정보를 저장한다. When the mobile station 110 is linked with the first base station 120a and the second base station 120b, the home agent 160 may determine the first location information assigned by the mobile station 110 from the network of the first base station 120a. And the mobile station 110 stores the second location information allocated from the network of the second base station 120b.

한편, 홈 에이전트(160)는, 이동국(110)에게 전송할 데이터를 제1기지국(120a)을 통해서 전송할 제1데이터와 제2기지국(120b)을 통해서 전송할 제2데이 터로 나누고, 제1데이터와 제1위치정보를 기초로 만들어진 IP 패킷을 제1위치정보로 전달하고, 제2데이터와 제2위치정보를 기초로 만들어진 IP 패킷을 제2위치정보로 전달할 수 있다. 또한, 홈 에이전트(160)는, 이동국(110)에게 전송할 데이터를 복사하여 복사한 데이터와 제1위치정보를 기초로 만들어진 IP 패킷을 제1위치정보로 전달하고, 복사한 데이터와 제2위치정보를 기초로 만들어진 IP 패킷을 제2위치정보로 전달할 수도 있다.Meanwhile, the home agent 160 divides the data to be transmitted to the mobile station 110 into the first data to be transmitted through the first base station 120a and the second data to be transmitted through the second base station 120b. The IP packet created based on the first location information may be transmitted as the first location information, and the IP packet created based on the second data and the second location information may be transmitted as the second location information. In addition, the home agent 160 transmits the copied data and the IP packet made based on the first location information to the first location information by copying the data to be transmitted to the mobile station 110 and the copied data and the second location information. The IP packet generated based on the P may be transmitted as the second location information.

본 발명의 2실시예에 따른 다중 안테나를 이용한 무선통신 시스템에서 제2기지국(120b)은 제1기지국(120a)과 서로 같은 무선통신네트워크(예컨대, WCDMA HSDPA, 와이브로, 무선랜 등)의 기지국 또는 서로 다른 무선통신네트워크의 기지국으로 구축될 수 있다.In the wireless communication system using the multiple antennas according to the second embodiment of the present invention, the second base station 120b is a base station of the same wireless communication network (eg, WCDMA HSDPA, WiBro, WLAN, etc.) as the first base station 120a. It can be constructed as a base station of different wireless communication networks.

이하에서는, 본 발명의 제 2실시예에 따른 다중 안테나를 이용한 무선통신 시스템에서의 통신방법을 도 2를 참조하여 설명하기로 한다. Hereinafter, a communication method in a wireless communication system using multiple antennas according to a second embodiment of the present invention will be described with reference to FIG.

먼저, 이동국(110)은 현재 제1기지국(120a)과 통신하고 있는 것으로 가정한다(S10). 즉, 이동국(110)은 제1기지국(120a)의 네트워크로부터 제1위치정보를 할당받았고, 홈 에이전트(160)는 이동국(110)으로 향하는 IP 패킷을 제1위치정보로 전달해준다. 설정된 조건을 만족할 경우, 제2기지국(120b)과의 링크연결을 요청하고(S20), 이에 따라, 제2기지국(120b)은 이동국(110)과 링크연결된다. First, it is assumed that the mobile station 110 is currently communicating with the first base station 120a (S10). That is, the mobile station 110 receives the first location information from the network of the first base station 120a, and the home agent 160 delivers the IP packet destined for the mobile station 110 as the first location information. If the set condition is satisfied, a link connection request with the second base station 120b is requested (S20), and accordingly, the second base station 120b is link-connected with the mobile station 110.

상기한 조건은, 도 2에서 전술한 바와 마찬가지로, 이동국(110)과 제1기지국(120a) 간의 채널상태, 이동국(110)과 제2기지국(120b) 간의 채널상태, 제1기지 국(120a)으로부터 이동국(110)으로 도달하는 신호의 세기, 제2기지국(120a)으로부터 이동국(110)으로 도달하는 신호의 세기, 이동국(110)과 제1기지국(120a) 간의 거리, 이동국(110)과 제2기지국(120b) 간의 거리, 제1기지국(120a)의 트래픽 로드, 제2기지국(120b)의 트래픽 로드, BER(bit error rate), FER(frame error rate), 및 간섭신호의 크기 중 하나 이상에 기초하여 설정될 수 있다.As described above with reference to FIG. 2, the above conditions are the channel state between the mobile station 110 and the first base station 120a, the channel state between the mobile station 110 and the second base station 120b, and the first base station 120a. Strength of the signal arriving from the mobile station 110 to the mobile station 110, the strength of the signal arriving from the second base station 120a to the mobile station 110, the distance between the mobile station 110 and the first base station 120a, the mobile station 110 and the first At least one of the distance between the two base stations 120b, the traffic load of the first base station 120a, the traffic load of the second base station 120b, the bit error rate (BER), the frame error rate (FER), and the size of the interference signal. It can be set based on.

제2기지국(120b)과의 링크연결 요청에 따라 이동국(110)과 제2기지국(120b)이 링크연결되는 과정에 대해서는 본 발명의 제 1실시예에서의 설명으로 유추가능하기 때문에 이에 대한 설명은 제 1실시예에서의 설명으로 대체하기로 한다. 이는 당업계에 종사하는 당업자라면 본 명세서를 통해 용이하게 유추할 수 있음이 자명하다. The process of linking the mobile station 110 and the second base station 120b in response to a link connection request with the second base station 120b can be inferred from the description in the first embodiment of the present invention. It will be replaced by the description in the first embodiment. It will be apparent to those skilled in the art that the present invention can be easily inferred through the present specification.

한편, 제2기지국과(120b)과의 링크연결 요청에 따라 이동국(110)은 복수의 안테나를 이용하여 제1기지국(120a)과 통신하면서 제2기지국(120b)과 링크연결을 유지한다(S30). 이 단계에서 이동국(110)은 제2기지국(120b)의 네트워크로부터 제2위치정보를 할당받고, 할당받은 제2위치정보를 홈 에이전트(160)에게 통보한다. 홈 에이전트(160)는 이동국(110)이 제1기지국(120a)의 네트워크로부터 할당받은 제1위치정보와 이동국(110)이 제2기지국(120b)의 네트워크로부터 할당받은 제2위치정보를 저장한다. 제2기지국(120b)은 제1기지국(120a)이 이동국(110)에게 전송하는 데이터와 서로 다른 데이터를 이동국(110)에게 전송할 수 있는데, 이 경우에 홈 에이전트(160)는 이동국(110)에게 전송할 데이터를 제1기지국(120a)을 통해서 전송할 제1데이터와 제2기지국(120b)을 통해서 전송할 제2데이터로 나누고, 제1데이터와 제1위치정보를 기초로 만들어진 IP 패킷을 제1위치정보로 전달하고, 제2데이터와 제2위치정보를 기초로 만들어진 IP 패킷을 제2위치정보로 전달한다. 또한, 제2기지국(120b)은 제1기지국(120a)이 이동국(110)에게 전송하는 데이터와 동일한 데이터를 이동국(110)에게 전송할 수 있는데, 이 경우에 홈 에이전트(160)는 이동국(110)에게 전송할 데이터를 복사하여 상기 복사된 데이터와 제1위치정보를 기초로 만들어진 IP 패킷을 제1위치정보로 전달하고, 상기 복사된 데이터와 제2위치정보를 기초로 만들어진 IP 패킷을 제2위치정보로 전달한다. Meanwhile, in response to a link connection request with the second base station 120b, the mobile station 110 maintains a link connection with the second base station 120b while communicating with the first base station 120a using a plurality of antennas (S30). ). In this step, the mobile station 110 receives the second location information from the network of the second base station 120b and notifies the home agent 160 of the allocated second location information. The home agent 160 stores the first location information assigned by the mobile station 110 from the network of the first base station 120a and the second location information assigned by the mobile station 110 from the network of the second base station 120b. . The second base station 120b may transmit data different from the data transmitted by the first base station 120a to the mobile station 110 to the mobile station 110. In this case, the home agent 160 transmits the data to the mobile station 110. The data to be transmitted is divided into first data to be transmitted through the first base station 120a and second data to be transmitted through the second base station 120b, and an IP packet generated based on the first data and the first location information is first location information. The IP packet generated based on the second data and the second location information is transmitted to the second location information. In addition, the second base station 120b may transmit the same data to the mobile station 110 as the data transmitted by the first base station 120a to the mobile station 110. In this case, the home agent 160 may transmit the mobile station 110. Copies data to be transmitted to the second server and transfers the IP packet created based on the copied data and the first location information to the first location information, and transmits the IP packet created based on the copied data and the second location information to the second location information. To pass.

이동국(110)이 복수의 안테나를 이용하여 제1기지국(120a)과 통신하면서 제2기지국(120b)과는 링크연결을 유지하고 있는 상태에서, 이동국(110)과 제1기지국(120a) 간의 연결해제가 요청되는 경우(S45), 이동국(110)과 제1기지국(120a) 간의 연결이 해제되고, 이동국(110)은 제2기지국(120b)과만 통신하게 된다(S55). 반대로, 이동국(110)이 복수의 안테나를 이용하여 제1기지국(120a)과 통신하면서 제2기지국(120b)과는 링크연결을 유지하고 있는 상태에서 이동국(110)과 제2기지국(120b) 간의 연결해제가 요청되는 경우(S40), 이동국(110)과 제2기지국(120b) 간의 링크연결이 해제되고, 이동국(110)은 제1기지국(120a)과만 통신하게 된다(S50).The mobile station 110 communicates with the first base station 120a using a plurality of antennas, and maintains a link connection with the second base station 120b. The mobile station 110 connects the mobile station 110 with the first base station 120a. When I is requested (S45), the connection between the mobile station 110 and the first base station 120a is released, and the mobile station 110 only communicates with the second base station 120b (S55). On the contrary, the mobile station 110 communicates with the first base station 120a using a plurality of antennas and maintains a link connection with the second base station 120b while the mobile station 110 communicates with the second base station 120b. When disconnection is requested (S40), the link connection between the mobile station 110 and the second base station 120b is released, and the mobile station 110 only communicates with the first base station 120a (S50).

또한, 이동국(110)이 복수의 안테나를 이용하여 제1기지국(120a)과 통신하면서 제2기지국(120b)과 링크연결을 유지한 상태에서, 이동국(110)과 제2기지국(120b) 간의 통신방법에 대한 설명에 대해서는 본 발명의 제 1실시예에서의 설명으로 유추가능하기 때문에 이에 대한 설명은 제 1실시예에서의 설명으로 대체하기로 한다. 이는 당업계에 종사하는 당업자라면 본 명세서를 통해 용이하게 유추할 수 있음이 자명하다. In addition, while the mobile station 110 maintains the link connection with the second base station 120b while communicating with the first base station 120a using a plurality of antennas, the communication between the mobile station 110 and the second base station 120b is performed. Since the description of the method can be inferred from the description in the first embodiment of the present invention, the description thereof will be replaced with the description in the first embodiment. It will be apparent to those skilled in the art that the present invention can be easily inferred through the present specification.

이상, 본 발명의 바람직한 실시예에 대하여 도시하고 설명하였지만, 본 발명은 상술한 특정의 실시예에 한정되지 아니하며, 청구범위에서 청구하는 본 발명의 요지를 벗어남이 없이 당해 발명이 속하는 기술분야에서 통상의 지식을 가진자에 의해 다양한 변형실시가 가능한 것은 물론이고, 이러한 변형 실시예들은 본 발명의 기술적 사상이나 전망으로부터 개별적으로 이해되어져서는 안될 것이다.As mentioned above, although the preferred embodiment of this invention was shown and described, this invention is not limited to the specific embodiment mentioned above, Usually, in the technical field to which this invention pertains without deviating from the summary of this invention claimed in a claim. Various modifications may be made by those skilled in the art, and these modifications should not be individually understood from the technical spirit or the prospect of the present invention.

<도면의 주요 부분에 대한 부호의 설명><Explanation of symbols for the main parts of the drawings>

110 : 이동국 120a : 제1기지국110: mobile station 120a: first base station

120b : 제2기지국 140 : 제어국120b: second base station 140: control station

150 : IP 코어 네트워크 160 : 홈 에이전트150: IP core network 160: home agent

Claims

A wireless communication system comprising a mobile station having a plurality of antennas, a first base station and a second base station,

The mobile station,

While communicating with the first base station,

In communication with the first base station by a link connection request with the second base station and simultaneously linked with the second base station using a plurality of antennas,

Communicate with the second base station by a disconnect request with the first base station,

The wireless communication system,

And a home agent connected to the first base station and the second base station through an IP core network.

While the mobile station is in communication with the first base station,

The home agent stores the first location information allocated by the mobile station from the network of the first base station, and transmits an IP packet to be transmitted to the mobile station as the first location information. system.

The method according to claim 1,

The link connection request with the second base station,

And the mobile station makes a request to the second base station if the set condition is satisfied.

The method according to claim 1,

The link connection request with the second base station,

And the mobile station makes a request to the first base station if the set condition is satisfied.

The method according to claim 1,

The link connection request with the second base station,

And the first base station makes a request to the second base station when the set condition is satisfied.

The method according to claim 1,

The link connection request with the second base station,

And requesting the mobile station from the second base station if the set condition is satisfied.

The method according to any one of claims 2 to 5,

The set condition is,

The channel state between the mobile station and the first base station, the channel state between the mobile station and the second base station, the strength of the signal reaching the mobile station from the first base station, the strength of the signal reaching the mobile station from the second base station, Distance between the mobile station and the first base station, distance between the mobile station and the second base station, traffic load of the first base station, traffic load of the second base station, bit error rate (BER), frame error rate (FER), And based on at least one of the magnitudes of the interference signals.

The method according to claim 1,

With the mobile station linked with the second base station,

And the second base station transmits a control message to the mobile station.

The method of claim 7,

The control message,

And at least one of information related to handoff, traffic load information of the second base station, interference information of the second base station, and channel information between the mobile station and the second base station. system.

The method according to claim 1,

With the mobile station linked with the second base station,

The first base station and the second base station is a wireless communication system using a multiple antenna, characterized in that for transmitting a signal using a diversity mode (diversity mode).

The method according to claim 1,

With the mobile station linked with the second base station,

The first base station and the second base station is a wireless communication system using multiple antennas, characterized in that for transmitting a signal using a multiplexing mode (multiplexing mode).

The method according to claim 1,

With the mobile station linked with the second base station,

The mobile station transmits a control message to the second base station.

The method according to claim 1,

With the mobile station linked with the second base station,

The mobile station transmits different data from the data transmitted to the first base station to the second base station.

The method according to claim 1,

With the mobile station linked with the second base station,

And the mobile station transmits the same data to the second base station as the data transmitted to the first base station.

The method according to claim 1,

With the mobile station linked with the second base station,

The mobile station transmits a signal to the first base station and the second base station using a diversity mode.

The method according to claim 1,

With the mobile station linked with the second base station,

The mobile station transmits a signal to the first base station and the second base station using a multiplexing mode.

The method according to claim 1,

And the second base station is a base station of the same wireless communication network as the first base station.

The method according to claim 1,

And the second base station is a base station of a different wireless communication network from the first base station.

The method according to claim 1,

With the mobile station linked with the second base station,

And the second base station transmits data different from the data transmitted from the first base station to the mobile station to the mobile station.

19. The method of claim 18,

Further comprising a control station for controlling the first base station and the second base station,

The control station divides data to be transmitted to the mobile station into data to be transmitted through the first base station and data to be transmitted through the second base station, and transmits different data to the first base station and the second base station. Wireless communication system using multiple antennas.

The method according to claim 1,

While the mobile station is connected to the second base station,

And the second base station transmits the same data to the mobile station as the data transmitted by the first base station to the mobile station.

The method of claim 20,

And a control station for controlling the first base station and the second base station.

And the control station copies data to be transmitted to the mobile station and transmits the same data to the first base station and the second base station.

delete

The method according to claim 1,

With the mobile station linked with the second base station,

And the home agent stores first location information allocated by the mobile station from the network of the first base station and second location information allocated from the network of the second base station.

The method according to claim 23,

The home agent divides data to be transmitted to the mobile station into first data to be transmitted through the first base station and second data to be transmitted through the second base station, and an IP made based on the first data and the first location information. And transmitting a packet to the first location information, and transmitting an IP packet based on the second data and the second location information to the second location information.

The method according to claim 23,

The home agent copies the data to be transmitted to the mobile station and transfers the IP packet made based on the copied data and the first location information to the first location information, and based on the copied data and the second location information. Wireless communication system using a multi-antenna, characterized in that for transmitting the IP packet made to the second location information.

A wireless communication method using multiple antennas in a wireless communication system including a mobile station having a plurality of antennas, a first base station and a second base station,

The mobile station communicating with a first base station;

Linking the mobile station with the second base station by communicating with the first base station using a plurality of antennas by a link connection request with the second base station; And

The mobile station communicating with the second base station in response to a disconnect request with the first base station,

While the mobile station is in communication with the first base station,

The home agent stores the first location information allocated by the mobile station from the network of the first base station, and transmits an IP packet to be transmitted to the mobile station as the first location information. .

The method of claim 26,

The link connection request with the second base station,

And the mobile station makes a request to the second base station when the set condition is satisfied.

The method of claim 26,

The link connection request with the second base station,

And the mobile station makes a request to the first base station when the set condition is satisfied.

The method of claim 26,

The link connection request with the second base station,

The first base station requests the second base station when the set condition is satisfied.

The method of claim 26,

The link connection request with the second base station,

The method according to any one of claims 27 to 30,

The set condition is,

The method according to claim 31,

And transmitting, by the second base station, a control message to the mobile station while the mobile station is in linkage with the second base station.

The method according to claim 32,

The control message,

And at least one of information related to handoff, traffic load information of the second base station, interference information of the second base station, and channel information between the mobile station and the second base station. Way.

The method of claim 26,

And the first base station and the second base station transmit signals using a diversity mode while the mobile station is in linkage with the second base station.

The method of claim 26,

And the first base station and the second base station transmit signals using a multiplexing mode while the mobile station is in linkage with the second base station.

The method of claim 26,

And transmitting, by the mobile station, a control message to the second base station while the mobile station is in linkage with the second base station.

The method of claim 26,

And transmitting data different from the data transmitted by the mobile station to the first base station to the second base station while the mobile station is in linkage with the second base station. Communication method.

The method of claim 26,

And transmitting the same data to the second base station as the data transmitted by the mobile station to the first base station while the mobile station is in linkage with the second base station. Way.

The method of claim 26,

And the mobile station transmits a signal to the first base station and the second base station by using a diversity mode while the mobile station is linked with the second base station. Way.

The method of claim 26,

And the mobile station transmits a signal to the first base station and the second base station using a multiplexing mode while the mobile station is linked with the second base station. Way.

The method of claim 26,

And the second base station transmitting the data different from the data transmitted by the first base station to the mobile station to the mobile station while the mobile station is in linkage with the second base station. Wireless communication method using.

The method of claim 41,

The control station divides data to be transmitted to the mobile station into data to be transmitted through the first base station and data to be transmitted through the second base station, and transmits different data to the first base station and the second base station. Wireless communication method using an antenna.

The method of claim 26,

And the second base station transmitting the same data to the mobile station as the data transmitted by the first base station to the mobile station while the mobile station is connected to the second base station. Wireless communication method.

The method of claim 43,

And a control station copies data to be transmitted to the mobile station and transmits the same data to the first base station and the second base station.

delete

The method of claim 26,

With the mobile station linked with the second base station,

Storing, by the home agent, first location information allocated by the mobile station from the network of the first base station and second location information allocated from the network of the second base station;

Dividing, by the home agent, data to be transmitted to the mobile station into first data to be transmitted through the first base station and second data to be transmitted through the second base station;

Transmitting, by the home agent, the IP packet generated based on the first data and the first location information to the first location information; And

And transmitting, by the home agent, the IP packet generated based on the second data and the second location information to the second location information.

The method of claim 26,

With the mobile station linked with the second base station,

Copying, by the home agent, data for transmission to a mobile station;

Transmitting, by the home agent, the IP packet generated based on the copied data and the first location information to the first location information; And

And transmitting, by the home agent, the IP packet generated based on the copied data and the second location information to the second location information.