KR20050107903A - Method for providing information of neighbor base station by mobile subscriber station in broadband wireless access system - Google Patents

Abstract

The present invention provides a method for providing base station information applied to a broadband wireless access system having a serving base station, at least one neighboring base station, and a mobile subscriber station (MSS). Performing, by the mobile station, scanning and synchronizing the neighboring base station during the scan period of the neighboring base station provided from the service providing base station; acquiring information about neighboring base stations during the scan and synchronization performing period; and providing the service. A method for providing base station information comprising transmitting a request message for handover to a base station and transmitting the obtained neighbor base station information to the service providing base station regardless of a request of the service providing base station. The handover can be done without requesting a base station. I By providing the frame information of the neighbor base stations to the base station from the terminal, the terminal has the effect to efficiently transmit up-to-date information about the neighbor base stations to the service provider base station.

Description

Method for providing neighboring base station information through mobile terminal in broadband wireless access system {Method for Providing Information of Neighbor Base Station by Mobile Subscriber Station in Broadband Wireless Access System}

The present invention relates to a method in which a service providing base station receives frame information of a neighboring base station through a terminal in a broadband wireless access system, and particularly, transfers frame information of a neighboring base station held by a mobile terminal preparing for handover to a serving base station It is about how to.

1 is an explanatory diagram illustrating a method for reporting neighboring base station information of a mobile terminal according to the prior art. Referring to FIG. 1, when a terminal measures a signal of neighboring base stations and satisfies a specified criterion, the terminal transmits the measurement information to a service providing base station. The mobile station transmits the measurement information to the service providing base station only at the request of a service providing base station.

2 is a flowchart illustrating a method for reporting neighboring base station information of a mobile station according to the prior art. As shown in FIG. 2, the mobile station performs neighbor base station scan and synchronization (S211, S212), and obtains signal strength and frame information of the neighbor base station during the process (S213). When there is a request for neighboring base station information from the service providing base station (S214), the neighboring base station information is transmitted to the service providing base station (S215).

According to the prior art, the mobile station measures the signal strength of the neighboring base station according to the indication of the service providing base station for connection with the base station having the largest signal size at the location where it is located. As such, when the base station satisfying the predetermined criterion is found while measuring the signal of the neighboring base station, the measurement information is provided to the service providing base station.

In this case, the mobile station always transmits the measurement report by the command of the base station. In a situation where all mobile terminals collect frame information of neighboring base stations, frame information may be provided at the request of the base station. However, in the case of a base station that collects frame information of a neighboring base station from a terminal where an event such as handover or scanning occurs, a situation arises in which a terminal that has collected the latest information is requested. In addition, in the case of a broadband wireless access system, a method of collecting information is not specifically defined.

The present invention has been proposed to solve the above problems, and in the broadband wireless access system, a method for delivering the frame information of the neighboring base station possessed by the mobile station preparing for handover to the service providing base station without the request of the service providing base station; The purpose is to provide.

The present invention for achieving the above object is applied to a broadband wireless access system having a serving base station, at least one neighboring base station, and a mobile subscriber station (MSS). A method of providing base station information, the method comprising: performing, by the mobile station, scanning and synchronizing a neighboring base station during a neighboring base station scan period provided from the service providing base station; Acquiring, transmitting a handover request message to the service providing base station, and transmitting the obtained neighboring base station information to the service providing base station regardless of the request of the service providing base station. .

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is an exemplary diagram illustrating a method for reporting neighboring base station information of a mobile station according to the present invention. Referring to FIG. 3, when a terminal measures a signal of neighboring base stations and satisfies a specified criterion, the terminal transmits the measurement information to a serviced base station. The mobile terminal provides measurement information to the serving base station regardless of the request of the serving base station.

4 is a flowchart illustrating a method for reporting neighboring base station information of a mobile station according to the present invention. As shown in Fig. 4, the mobile station performs neighbor base station scan and synchronization (S411, S412), and obtains signal strength and frame information of the neighbor base station during the process (S413). The terminal stores the frame information of the neighboring base station obtained by the measurement. The saved measurement results are reported regardless of the request of the base station. In particular, when the handover request message is transmitted to the service providing base station (S414), the measurement result may be transmitted to the service providing base station before and after the handover request message transmission (S415).

Table 1 below shows an example of a neighbor base station information providing message.

Syntax Size Notes MSS-NBR-REP_Message_Format () { Management Message Type =? 8 bits N_NEIGHBORS 24 bits For (j = 0; j <N_NEIGHBORS; j ++) { Neighbor BS-ID 48 bits Physical Frequency 32 bits TLV Encoded Neighbor Information Variable TLV sepcific } }

5 is another exemplary flowchart illustrating a method for reporting neighboring base station information of a mobile station according to the present invention. When the mobile terminal is powered on, the neighboring base station information is received from the service providing base station (S511), and the information about the period during which the neighboring base station can be scanned from the service providing base station is received (S512).

The mobile station synchronizes with the target base stations (Target BS) during the scan period (S513) and measures signal strength and frame information (S514). If it is determined that handover is necessary based on the measured signal strength, the mobile station requests a handover from the service providing base station (S515).

The mobile station transmits the information of the neighboring base station obtained in synchronization with the neighboring base station to the service providing base station before and after the handover request (S516). The neighbor base station information may be transmitted through a MAC access message.

The service providing base station transmits a quality of service (“QoS”) parameter for maintaining service provision to neighboring base stations according to a request of the terminal (S517). The neighboring base station informs the service providing base station of whether Qos can be provided (S518).

The service providing base station recommends a target BS to perform a handover to the mobile terminal according to the response received from the neighboring base station (S519). The mobile terminal provided with the target base station requests a service release from the service providing base station for handover (S520). The target base station provides uplink information to the handed over mobile terminal (S521) and performs a network re-registration process.

According to the present invention, by providing frame information of neighboring base stations to the base station from the terminal where the handover has occurred without the request of the base station, the terminal can efficiently transmit the latest information about the neighbor base stations to the serving base station.

1 is an explanatory diagram showing a method for reporting neighboring base station information of a mobile terminal according to the prior art;

2 is a flowchart illustrating a method for reporting neighboring base station information of a mobile station according to the prior art.

3 is an exemplary explanatory diagram illustrating a method for reporting neighboring base station information of a mobile station according to the present invention;

4 is a flowchart illustrating a method for reporting neighboring base station information of a mobile station according to the present invention.

5 is another exemplary flowchart illustrating a method for reporting neighboring base station information of a mobile station according to the present invention.

Claims (4)

A base station information providing method applied to a broadband wireless access system having a serving base station, at least one neighboring base station, and a mobile subscriber station (MSS), Performing, by the mobile terminal, scanning and synchronizing with a neighbor base station during a neighbor base station scan period provided from the service providing base station; Acquiring information about neighbor base stations during the scan and synchronization interval; Transmitting a handover request message to the service providing base station; And Regardless of a request of the service providing base station, transmitting the obtained neighboring base station information to the service providing base station. Base station information providing method comprising a. The method of claim 1, The transmitting of the neighbor base station information to the service providing base station, The base station information providing method, characterized in that performed before the step of transmitting the handover request message. The method of claim 1, The neighbor base station information, the base station information providing method comprising the signal strength and frame information of the neighbor base station. The method of claim 1, The base station information control method of the base station information, characterized in that transmitted through a medium management message (MAC management message).