KR20110100395A - Method and apparatus for providing detour information for shadow area in wireless communication system - Google Patents

Abstract

In the wireless communication system, the shadow area detour information providing method includes a process of requesting, by a base station, an information server for surrounding environment information on a corresponding terminal when triggering a request for providing surrounding environment information for the corresponding terminal occurs; Receiving surrounding environment information from an information server; scanning, by the corresponding terminal, neighboring base stations based on the surrounding environment information; and surrounding information and surrounding base station received by the corresponding terminal from the information server. And displaying a digital map on which the neighboring base stations and the corresponding terminal are displayed on the screen based on the scanning result.

Description

METHOD AND APPARATUS FOR PROVIDING DETOUR INFORMATION FOR SHADOW AREA IN WIRELESS COMMUNICATION SYSTEM}

The present invention relates to a military communication network, and more particularly, to a method and apparatus for providing and displaying shadow area bypass information in a military wireless communication system.

TICN, the next-generation tactical communication system, is a high-speed, high-capacity tactical information (voice / data / video) for integrated combat power of reconnaissance surveillance, command determination, and precision strike in future network-oriented warfare. Next-generation military tactical communication system that delivers in real time. The tactical mobile communication field of the TICN system may be implemented by applying special situations or functions of a group to a WiMAX system environment based on the IEEE 802.16 standard. Most military networks consider the mobility of the base station as well as the mobility of the terminal in various regions such as mountainous terrain. In other words, in the military network, the base stations can be carried in a vehicle to distinguish from the existing mobile communication network.

Meanwhile, in the conventional mobile communication network, even when the terminals move within the cell area of the fixed base stations, the terminal may maintain the connection through the base station handover procedure. In addition, in the case of the terminal by displaying the number of antennas on the screen of the terminal according to the received signal strength, the user of the terminal can recognize how much the received signal strength from the base station.

In the conventional mobile communication network, even if the terminal fails to perform handover between base stations due to the shadow area, the user cannot determine what action to take. That is, according to the defined procedure between the base station and the terminal, the terminal only searches for and connects to the base station where the call is possible.

In the military network, many terminals and a plurality of base stations exist in a mountainous area, and the shadow area may occur or change more frequently than a general mobile communication environment due to the mobility of a plurality of terminals and a plurality of base stations according to military operations. .

However, in the military network where the shaded area occurs or changes more frequently than the general mobile communication environment, the user can simply call the user of the terminal to continue the call or quickly by simply using the number of antennas corresponding to the signal strength displayed on the terminal. It does not help you decide what to do to move to the area.

That is, it is difficult to maintain a seamless connection only with the existing signaling procedure between the terminal and the base station for handover in a military network in which the base station and the terminal move.

Accordingly, there is a need for a method and apparatus for providing shadow area bypass information to a user in order to maintain a seamless connection between the base station and the terminal in a military network in which the base station and the terminal move.

An object of the present invention is to provide a method and apparatus for providing shadow area bypass information in a wireless communication system.

It is another object of the present invention to provide a method and apparatus for determining a direction in which a terminal user moves by displaying base station information and signal strength information around the terminal on the terminal before the terminal reaches the shaded area in the military network.

Another object of the present invention is to provide the base station information and signal strength information around the terminal to the terminal before the terminal reaches the shaded area in the military network, when the terminal enters the shaded area, the terminal is a GPS location The present invention provides a method and apparatus for providing information to track a location through information and to exit the shadowed area with the shortest path.

According to a first aspect of the present invention for achieving the above object, in the method for providing shadow area detour information in a wireless communication system, when the environment information request request triggering occurs for the terminal, the base station is a peripheral environment for the terminal Requesting information from an information server, receiving, by the terminal, environmental information from the information server, scanning, by the terminal, neighboring base stations based on the environmental information, and by the terminal, And displaying a digital map representing the surrounding environment of the terminal on the screen based on the surrounding environment information received from the information server and the scanning result of the neighboring base station.

According to a second aspect of the present invention for achieving the above object, a method for operating a terminal for providing shadow area detour information in a wireless communication system, the process of receiving the surrounding environment information from the information server, and the surrounding environment information Scanning the neighbor base stations based on the received information; and displaying a digital map indicating the surrounding environment of the terminal on the screen based on the surrounding environment information received from the base information server and the scanning result of the neighbor base station. It features.

According to a third aspect of the present invention for achieving the above objects, in the shaded area bypass information providing wireless communication system, when the environment information request request triggering occurs for the terminal, the information server for the surrounding environment information for the terminal Receiving the environment information from the base station and the information server requesting, and scanning the neighboring base stations based on the surrounding environment information, based on the surrounding environment information received from the information server and the scanning result of the peripheral base station, It characterized in that it comprises a terminal for displaying a digital map representing the surrounding environment of the terminal on the screen.

According to a fourth aspect of the present invention for achieving the above objects, there is provided a terminal device for providing shadow area bypass information in a wireless communication system, comprising: an environment recognition module for receiving environment information from an information server; And a MAC layer unit configured to scan peripheral base stations based on environmental information, wherein the peripheral environment recognition module displays the surrounding environment of the terminal on a screen based on the surrounding environment information received from the information server and the scanning result of the peripheral base station. And displaying a digital map.

As described above, before the terminal reaches the shaded area in the military network, the base station information and signal information around the terminal is displayed on the terminal and provided to the user, where the user moves so that the call can be made according to the change of the shaded area. There is an advantage that can be determined quickly. In addition, when the terminal enters the shadowed area, the terminal may track the location through the GPS location information and exit the shadowed area with the shortest path.

1 is a block diagram of a Tactical Information Communication Network (TICN) according to an embodiment of the present invention;
2 is a configuration diagram of a node according to an embodiment of the present invention;
3 is a signal flow diagram for providing shadow area bypass information based on a handover procedure in a military network according to an embodiment of the present invention;
4 is a signal flow diagram for providing shadow area bypass information in an idle mode or a sleep mode in a military network according to an embodiment of the present invention;
5 is a configuration diagram of a terminal, a RAS (or base station), and a WSM (system operation / management equipment) according to an embodiment of the present invention;
6 is a terminal screen showing shadow area detour information according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. In the following description of the present invention, detailed descriptions of related well-known functions or configurations will be omitted if it is determined that the detailed description of the present invention may unnecessarily obscure the subject matter of the present invention. Terms to be described later are terms defined in consideration of functions in the present invention, and may be changed according to intentions or customs of users or operators. Therefore, the definition should be made based on the contents throughout the specification.

Hereinafter, a method and apparatus for providing shadow area bypass information in a wireless communication system will be described. In particular, according to the method for providing shadow area bypass information in a wireless communication system, the base station triggers provision of surrounding environment information to the terminal, delivers information of the network necessary for the terminal to the terminal, and the terminal transmits the shadow area to the user based on the information. And signal strength of neighboring base stations.

1 illustrates an example of a Tactical Information Communication Network (TICN) according to an embodiment of the present invention.

Referring to FIG. 1, four base nodes form a base network, and the base nodes are connected by a high speed high capacity wireless link. Subsidiary nodes are then connected to their base nodes. For example, the adjunct nodes may be connected to the base node in a tree structure, connected in a mesh structure, or connected to the base node in a multi-hop structure.

Here, each of the base nodes is a structure in which the system moves in a vehicle, and the backbone is wirelessly connected through a large capacity wireless device. Similarly, auxiliary nodes also form a tree structure / mesh structure / multi-hop structure in which the system is carried in a vehicle.

The base node or the configuration of the subordinate node is shown in FIG. 2.

2 is a block diagram of the base node or the auxiliary node according to an embodiment of the present invention.

Referring to FIG. 2, each node includes a radio access station (RAS), an access control router (ACR), and a WiMAX system manager (WSM). The ACR controls the terminal and the RAS and routes the IP packet. In addition, the ACR can access AAA (Authentication Authorization Accounting), VoIP switchboard, IEEE 1588 Master, other servers, and mass routers through L3 switch.

The RAS transmits and receives with the terminal through the air interface at the network end. The WiMAX System Manager (WSM) is an operation management device and manages state information of a terminal including IP address and MAC address information of the terminal. In addition, each node may further include a small repeater.

Finally, in the TICN system, the tactical mobile communication network and the terminal each embed a global positioning system (GPS) and a digital map.

3 illustrates a procedure for providing shadow area detour information based on a handover procedure in a military network according to an embodiment of the present invention.

Referring to FIG. 3, the terminal and the serving base station perform data transmission in step 300, and the serving base station and ACR perform data transmission in step 302.

Thereafter, the terminal periodically receives a MOB_NBR-ADV message (Neighbor Advertisement Message) from the serving base station in step 304, and performs a scan request procedure in step 306. That is, when the terminal transmits a scan request message (MOB_SCN-REQ) to the serving base station, the serving base station transmits a scan response message (MOB_SCN-RSP) to the terminal.

Thereafter, the terminal and the target base station performs a scan procedure in step 308. That is, the terminal transmits a ranging request (RNG-REQ) to the target base station, receives a ranging response (RNG-RSP) from the target base station to synchronize. The terminal also synchronizes with neighboring base stations.

Thereafter, when it is determined in step 310 that it is difficult to maintain a connection with the serving base station when the signal strength of the serving base station is less than a threshold, the terminal transmits a handover request message (MOB_MSHO-REQ) to the serving base station.

When the serving base station receives a handover request from the terminal, there is no target base station that can be handed over to the terminal or carrier to interference-and-noise ratio (CINR) or RSSI (received signal strength indication) of neighboring base stations. If it is less than the threshold (314), the serving base station requests the environment information including the neighboring base station location for the terminal to the WSM (Neighborhood Information Providing Server) in step 314.

That is, in the serving base station, after the handover is triggered, the CINR or RSSI values of neighboring base stations measured and reported by the terminal are not available for handover or the handover is possible, but the CINR or RSSI values of neighboring base stations are less than or equal to a threshold. In this case, the OSM (Operations, Administration and Maintenance) software requests a procedure for requesting the surrounding information including the location of the neighboring base station for the terminal to the peripheral information providing server of the operation management equipment. At this time, the base station provides the MAC address information of the terminal to the WSM.

In step 316, the WSM identifies a terminal that needs to provide surrounding environment information by using the MAC address of the terminal received from the serving base station and the IP and MAC address and status information of the terminal managed by the WSM. The neighboring base station location and related information are transmitted to the terminal. The neighbor base station information includes BSID / location / FA / PI (Preamble Index) information for the base station around the terminal and shadow area log information of existing terminals.

Meanwhile, the WSM collects surrounding environment information to transmit neighbor base station information to the corresponding terminal. For example, the surrounding environment information may be collected by the operator configuring the database, or the surrounding environment information may be collected by receiving a report such as shadow area log information from the corresponding terminals.

In step 320, the terminal performs scanning based on the neighbor base station information from the WSM to measure signal strengths of neighbor base stations.

In step 322, the terminal displays the neighbor base station information and the measured signal strength information of the neighbor base stations from the WSM on the digital map screen.

FIG. 4 illustrates a procedure for providing shadow area bypass information in an idle mode or a sleep mode in a military network according to an exemplary embodiment of the present invention.

Referring to FIG. 4, the terminal operates in an idle mode or a sleep mode in step 400.

In step 402, when the terminal is activated in the idle mode or the sleep mode, the serving base station requests the WSM to provide the surrounding environment information at every initial activation mode of the terminal, and the surrounding environment information of the WSM. In step 410, the server transmits the neighbor base station location and related information to the terminal. The neighbor base station information includes BSID / location / FA / PI (Preamble Index) information for the base station around the terminal and shadow area log information of existing terminals.

In step 412, the terminal performs scanning based on the neighbor base station information from the WSM to measure signal strengths of neighbor base stations.

In step 414, the terminal displays the neighbor base station information and the measured signal strength information of the neighbor base stations from the WSM on the digital map screen.

Meanwhile, when the terminal transitions from the idle mode or the sleep mode to the active mode, or when there is no target base station when the terminal requests a handover, the serving base station requests WSM information from the neighboring base station. The information will be updated. In this case, the terminal stores its location information and time, when the digital map is displayed on the terminal screen by the terminal user, the location and shadow area information of the neighboring base stations and the signal strength of each neighboring base station measured by the terminal itself, In addition, the current location of the terminal acquired through GPS and the location and time of the terminal stored at the time of updating the information are displayed together on the digital map.

5 is a block diagram of a terminal, a RAS (or base station), and a WSM according to an embodiment of the present invention.

Referring to FIG. 5, the terminal 500 includes a physical layer unit 502, a MAC layer unit 504, and a surrounding environment recognition module 506. The RAS 510 includes a physical layer unit 512. , The MAC layer unit 514 and the OAM module 516 are configured, and the WSM 520 is configured as the environment information server 525.

When the handover request is made by the terminal, the MAC layer unit 514 of the RAS 510 sends a peripheral environment information request request triggering signal to the OAM module 156 when the target base station is not present or the signal strength of the neighboring base stations is less than or equal to the threshold. send.

The OAM module 516 performs network management functions such as system monitoring and configuration management. In addition to the present invention, when the OAM module 516 receives the surrounding environment information provision request triggering signal from the MAC layer unit 514, the WSM 520 requests the surrounding environment information to be provided along with the MAC address of the corresponding terminal. do.

When the environment information server 525 of the WSM 520 receives a request for providing the environment information from the RAS 510, the environment information server 525 of the WSM 520 provides the environment information of the corresponding terminal based on the MAC address of the corresponding terminal. The surrounding environment information includes BSID / location / FA / PI (Preamble Index) information and shadow area log information of existing terminals.

The surrounding environment recognition module 506 of the terminal 500 updates the surrounding environment map of the terminal itself based on the surrounding environment information received from the surrounding environment information server 525.

In addition, the environment recognition module 506 requests the MAC layer unit 504 to scan neighbor base stations. At this time, RSSI / CINR is measured for each FA / PI of neighboring base stations through a scanning procedure.

The MAC layer unit 504 scans neighbor base stations and transmits base station FA / PI information to the surrounding environment recognition module 506. The surrounding environment recognition module 506 configures the surrounding environment map as shown in FIG. 6 based on the information received from the surrounding environment information server 525 and the MAC module 504, and displays it to the user.

6 illustrates an example of shadow area detour information on a terminal screen according to an exemplary embodiment of the present invention.

Referring to FIG. 6, the user may check the current terminal's own location / time information and the previous terminal's own location / time information on the digital map through the terminal screen, and further, location and signal strength information of neighboring base stations. You can check. In addition, since the user can check the shadowed area around the current location, the user can determine whether to bypass the shaded area or quickly pass the shadowed area based on the information provided on the terminal screen.

If the shadow area passes through the shadow area, the terminal triggers the shadow area, then tracks the location information of the terminal itself and stores it as a log file. Send location information log file of WSM to WSM.

Accordingly, the WSM collects / analyzes the shadow area location information logs received from each terminal to check the information on the location where the shadow area is likely on the map at the time of updating of the terminal (active or peripheral information request). In addition to the location of the neighboring base station, the terminal user accessing the shadow area can cope with the shadow area. In other words, the user determines whether to pass through the shaded region or bypass the shaded region with reference to the shaded region information.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the scope of the following claims, but also by the equivalents of the claims.

Ambient environment recognition module: 506, Ambient environment information server: 525, OAM: 516

Claims (24)

In the shadow area detour information providing method in a wireless communication system,
Requesting, by a base station, an information server for the surrounding environment information on the terminal when triggering the request for providing the surrounding environment information for the terminal;
Receiving, by the terminal, environment information from the information server;
Scanning, by the terminal, neighboring base stations based on the surrounding environment information;
And displaying, by the terminal, a digital map representing the surrounding environment of the terminal on a screen, based on the surrounding environment information received from the information server and the scanning result of the neighboring base station.
The method of claim 1,
Triggering request for providing environment information for the terminal,
Occurs when a target base station does not exist or a signal strength of neighboring base stations is less than or equal to a threshold when a handover request of the terminal is performed;
When the terminal is switched from the idle mode or the sleep mode to the active mode.
The method of claim 1,
The surrounding environment information includes at least one of a base station identifier (BSID), a base station location, a frequency assignment (FA), a preamble index (PI), and shadow area information.
The method of claim 1,
Scanning the neighbor base stations based on the surrounding environment information,
A method for measuring a Received Signal Strength Indication (RSSI) or a Carrier to Interference Noise Ratio (CINR) for each Base Station (FA) / Preamble Index (PINR).
The method of claim 1,
The process of displaying a digital map representing the surrounding environment of the terminal on the screen,
And displaying at least one of the current location / current time information of the terminal, the previous location / time information of the terminal, the location and signal strength of neighboring base stations, and the shadow area.
The method of claim 1,
Storing, by the terminal, the location / time information of the terminal in the transliteration region as a shadow region log when the terminal passes the shadow region;
And after the terminal passes the transliteration region, transmitting the shadow region log information to the information server through a connected base station.
The method of claim 1,
And receiving, by the information server, shadow area information from corresponding terminals and updating surrounding environment information.
A terminal operation method for providing shadow area bypass information in a wireless communication system,
Receiving the environment information from the information server;
Scanning peripheral base stations based on the surrounding environment information;
And displaying a digital map representing the surrounding environment of the terminal on the screen based on the surrounding environment information received from the information server and the scanning result of the neighboring base station.
The method of claim 8,
The surrounding environment information includes at least one of a base station identifier (BSID), a base station location, a frequency assignment (FA), a preamble index (PI), and shadow area information.
The method of claim 8,
Scanning the neighbor base stations based on the surrounding environment information,
A method for measuring a Received Signal Strength Indication (RSSI) or a Carrier to Interference Noise Ratio (CINR) for each Base Station (FA) / Preamble Index (PINR).
The method of claim 8,
The process of displaying a digital map representing the surrounding environment of the terminal on the screen,
And displaying at least one of the current location / current time information of the terminal, the previous location / time information of the terminal, the location and signal strength of neighboring base stations, and the shadow area.
The method of claim 8,
Storing, by the terminal, the location / time information of the terminal in the transliteration region as a shadow region log when the terminal passes the shadow region;
And after the terminal passes the transliteration region, transmitting the shadow region log information to the information server through a connected base station.
In the wireless communication system providing shadow area bypass information,
A base station requesting an information server for surrounding environment information on the terminal when triggering request for providing surrounding environment information for the terminal occurs;
Receiving the environment information from the information server,
Scanning peripheral base stations based on the surrounding environment information;
And a terminal displaying a digital map representing the surrounding environment of the terminal on a screen, based on the surrounding environment information received from the information server and the scanning result of the neighboring base station.
The method of claim 13,
The base station comprises:
When the target base station does not exist or the signal strength of neighboring base stations when the handover request of the terminal is less than the threshold, generating a request for providing the surrounding environment information for the terminal, or
And when the terminal is switched from the idle mode or the sleep mode to the activation mode, generating a request for providing the surrounding environment information for the terminal.
The method of claim 13,
The environment information includes at least one of a base station identifier (BSID), a base station location, a frequency assignment (FA), a preamble index (PI), and shadow area information.
The method of claim 13,
The terminal,
Device for measuring the received signal strength indication (RSSI) or the carrier to interference noise ratio (CINR) for each base station (FA) / Preamble Index (PI) for the base station.
The method of claim 13,
The terminal,
And displaying at least one of the current location / current time information of the terminal, the previous location / time information of the terminal, the location and signal strength of neighboring base stations, and the shadow area on the screen.
The method of claim 13,
The terminal,
When the terminal passes the shadow area, the terminal stores the location / time information of the terminal in the transliteration area as a shadow area log,
And after the terminal passes the sound region, transmitting the shadow region log information to the information server through a connected base station.
The method of claim 13,
And the information server receiving the shadow area information from the terminals and updating the surrounding environment information.
A terminal device for providing shadow area bypass information in a wireless communication system,
Peripheral environment recognition module for receiving the environment information from the information server,
It includes a MAC layer for scanning peripheral base stations based on the surrounding environment information,
And the surrounding environment recognition module displays a digital map representing the surrounding environment of the terminal on a screen based on the surrounding environment information received from the information server and the scanning result of the neighboring base station.
The method of claim 20,
The environment information includes at least one of a base station identifier (BSID), a base station location, a frequency assignment (FA), a preamble index (PI), and shadow area information.
The method of claim 20,
The MAC layer unit,
Device for measuring the received signal strength indication (RSSI) or the carrier to interference noise ratio (CINR) for each base station (FA) / Preamble Index (PI) for the base station.
The method of claim 20,
The surrounding environment recognition module,
And displaying at least one of current location / current time information of the terminal, previous location / time information of the terminal, location and signal strength of neighboring base stations, and a shadow area.
The method of claim 20,
The MAC layer unit,
When the terminal passes the shadow area, the terminal stores the location / time information of the terminal in the transliteration area as a shadow area log,
And after the terminal passes the sound region, transmitting the shadow region log information to the information server through a connected base station.

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