KR101590426B1 - Method and a station for performing voice roaming in wireless commnucation system - Google Patents

Abstract

The present invention relates to a reliable voice roaming service method and a terminal therefor in a wireless communication system, and more particularly, to a method and apparatus for reliable voice roaming service in a wireless communication system, comprising: detecting a plurality of access points (APs) having the same voice SSID (Service Set Identifier) Registering, as a preferred AP, an AP having a predetermined relationship with the pre-registered data SSID among the plurality of APs; And initiating roaming to the preferred AP when a predetermined condition is met.

Description

TECHNICAL FIELD [0001] The present invention relates to a method and apparatus for performing reliable voice roaming in a wireless communication system,

The present invention relates to a method for performing reliable voice roaming in a wireless communication system and a terminal for the method.

Voice over IP (VoIP) is a service for transmitting voice data through an Internet Protocol (IP), and is a method for providing voice data in a packet switched (PS) area in the conventional circuit switched (CS) area. For example, voice data can be provided in the PS area through an Internet network of a 3GPP LTE or LTE-Advanced (LTE-Advanced) system (VoLTE). CS-based voice services transmit data while maintaining end-to-end connection, but because VoIP transmits data less connection-less, There is an advantage that it can be used efficiently. Recently, as data throughput increases, existing CS-based services are being replaced by PS-based services.

Although VoIP has an advantage that it can use network resources efficiently, APs supporting the same use the same SSID for voice only, so that there is a problem that quality of voice service can not be assured when there are several APs .

FIG. 1 is a flowchart illustrating a roaming method of a terminal according to signal strengths of two conventional APs.

Referring to FIG. 1, assuming that there are two APs, when the terminal is in connection with a specific AP 1 (S101), the signal strength of the AP 1 becomes smaller than -79 dB (S103) 2 is detected to have an intensity of -65DdB or more (S105), the terminal starts roaming with the AP 2 (S107).

Thereafter, when the terminal and the AP 2 are connected (S109), the strength of the AP 2 is again lowered (S111), and the strength of the AP 1 is increased (S113) Roaming may be started (S115).

Here, if the AP (1) is an access point that has been trusted and the AP (2) is an unreliable access point, if the signal of the AP 1 that has been trusted is lowered to a certain level After the roaming is started to the unreliable AP 2 and the roaming with the AP 2 is started, it is possible to return to the AP 1 again after the signal of the AP 2 is lowered, There is a problem that the AP 1 can not return to the AP 1 even if the signal strength of the AP 1 increases.

That is, regardless of the user's reliability and preference, since the unreliable signal of the AP is lowered to a certain level, roaming to the trusted AP is possible, which poses a problem of being vulnerable to security or hacking.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the related art, and it is an object of the present invention to provide a method for performing reliable voice roaming in a wireless communication system and a terminal for the same.

Another object of the present invention is to provide a method and system for providing a VoIP service through an AP by registering a trusted AP among APs having the same hidden SSID and roaming to guarantee a voice quality level, The present invention provides a method for performing reliable voice roaming in a wireless communication system and a terminal for the same.

In addition, if a reliable AP is already recognized, it is possible to give a predetermined condition and immediately start roaming to a trusted AP when the condition is satisfied, thereby ensuring a voice quality level, A voice roaming service for solving the problem and a terminal for the voice roaming service.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not intended to limit the invention to the precise form disclosed. Lt; / RTI >

According to an aspect of the present invention, there is provided a method of performing voice roaming in a wireless communication system, the method comprising: detecting a plurality of access points (APs) having the same voice SSID (Service Set Identifier); Registering, as a preferred AP, an AP having a predetermined relationship with the pre-registered data SSID among the plurality of APs; And initiating roaming to the preferred AP when a predetermined condition is met.

The step of registering the preferred AP further comprises the steps of detecting first BSSID information corresponding to the same voice-only SSID and preferring an AP corresponding to a first BSSID in a predetermined relationship with second BSSID information corresponding to the previously registered data SSID And registering with the AP.

Wherein the registering of the preferred AP comprises: if the pre-registered data SSID is absent, selecting the AP through manual AP search, detecting the corresponding second BSSID information, comparing the first BSSID information corresponding to the same voice- And registering the AP corresponding to the first BSSID having a predetermined relationship with the second BSSID information corresponding to the previously registered data SSID as a preferred AP.

The predetermined relationship includes registering, as a preferred AP, an AP corresponding to a first BSSID having a difference between the second BSSID and a difference between the second BSSID and a predetermined value or less and a difference between the second BSSID and a predetermined value or less.

The predetermined condition includes that a signal exceeding a predetermined threshold value is detected from the preferred AP regardless of the signal strength of the access point connected to the terminal.

The predetermined threshold value includes -70 dB.

The predetermined condition includes what is performed when the terminal is in the waiting state.

According to another embodiment of the present invention, there is provided a terminal for performing voice roaming in a wireless communication system, comprising: a plurality of access points (APs) having the same voice dedicated SSID (Service Set Identifier) A registration unit for registering, as a preferred AP, an AP having a predetermined relationship with the previously registered data SSID among the plurality of APs; And a roaming unit for initiating roaming to the preferred AP when a predetermined condition is satisfied.

Wherein the registration unit comprises: a first detection unit for detecting a plurality of first BSSIDs corresponding to the same voice-only SSID; A second detecting unit detecting second BSSID information corresponding to the pre-registered data SSID; And a preferred AP registering unit that registers, among the plurality of first BSSIDs detected by the first detecting unit, a second BSSID detected by the second detecting unit and an AP corresponding to a first BSSID whose difference is equal to or less than a predetermined value, as a preferred AP; .

The second detection unit includes selecting the AP through manual AP search and detecting the second BSSID information when the pre-registered data SSID does not exist.

Wherein the predetermined condition includes being performed when a signal of a predetermined threshold value or more is detected from the preferred AP and the terminal is in the waiting state regardless of the signal strength of the access point being connected to the terminal, Lt; RTI ID = 0.0 > -70dB. ≪ / RTI >

Meanwhile, a terminal for performing voice roaming in a wireless communication system includes: a registration unit for selecting and registering one preferred AP among a plurality of access points (APs) having the same voice dedicated SSID (Service Set Identifier); And a roaming unit for initiating roaming to the preferred AP when a signal of a predetermined threshold value or more is detected from the preferred AP regardless of a signal strength of an access point connected to the terminal.

The predetermined threshold value includes -70 dB.

The predetermined condition includes what is performed when the terminal is in the waiting state.

The foregoing general description and the following detailed description of the invention are illustrative and are for further explanation of the claimed invention.

According to each of the embodiments of the present invention as described above, it is possible to solve the problem of hacking and security by starting roaming by presetting a reliable AP by the user.

Also, regardless of the strength of the signal of the unreliable AP, when a signal of a certain level of the reliable AP is detected, roaming can be initiated to guarantee the voice quality level of the VoIP service through the AP.

The effects obtained by the present invention are not limited to the above-mentioned effects, and other effects not mentioned can be clearly understood by those skilled in the art from the following description will be.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention. It is to be understood, however, that the technical features of the present invention are not limited to the specific drawings, and the features disclosed in the drawings may be combined with each other to constitute a new embodiment.
FIG. 1 is a flowchart illustrating a roaming method of a terminal according to signal strengths of two conventional APs.
2 is a flowchart illustrating a method for reliable voice roaming service in a wireless communication system according to an embodiment of the present invention.
3A is an exemplary diagram illustrating a data SSID, a hidden SSID, and a corresponding BSSID corresponding to an AP according to an exemplary embodiment of the present invention.
3B is an exemplary diagram illustrating a data SSID, a hidden SSID, and a corresponding BSSID corresponding to an AP according to an exemplary embodiment of the present invention.
4 is a flowchart illustrating a method of registering a trusted preferred AP in a wireless communication system according to an exemplary embodiment of the present invention.
5 is a flowchart illustrating a roaming service method using a reliable preferred AP in a wireless communication system according to an exemplary embodiment of the present invention.
FIG. 6 is a block diagram illustrating a terminal 600 providing a voice roaming service according to an embodiment of the present invention.

Embodiments of the present invention relate to a method for registering a trusted preferred AP in a wireless communication system, a roaming method using the same, and a terminal for the method. The following embodiments are a combination of elements and features of the present invention in a predetermined form. Each component or characteristic may be considered optional unless otherwise expressly stated. Each component or feature may be implemented in a form that is not combined with other components or features. In addition, some of the elements and / or features may be combined to form an embodiment of the present invention. The order of the operations described in the embodiments of the present invention may be changed. Some configurations or features of certain embodiments may be included in other embodiments, or may be replaced with corresponding configurations or features of other embodiments.

In the description of the drawings, there is no description of procedures or steps that may obscure the gist of the present invention, nor is any description of steps or steps that can be understood by those skilled in the art.

In the present specification, embodiments of the present invention have been described mainly on the transmission and reception of signals in a wireless communication system including an access point (AP). Here, the access point is meaningful as a terminal node of a network that directly communicates with a station (terminal). That is, various operations performed for communication with a mobile station in a network consisting of a plurality of network nodes including an access point may be performed by a base station or other network nodes other than the base station. At this time, the 'access point' may be replaced by terms such as a base station, a fixed station, a Node B, an eNode B (eNB), or an Advanced Base Station (ABS)

In addition, in the present invention, a terminal means in a voice roaming service according to the present invention means a terminal can be simply called a device. Also, the terminal may be a mobile station (MS), a user equipment (UE), a subscriber station (SS), a mobile subscriber station (MSS), a mobile terminal, Terminal or a device.

Embodiments of the present invention may be supported by standard documents disclosed in at least one of IEEE 802 systems, 3GPP systems, 3GPP LTE and LTE-Advanced (LTE-Advanced) systems, and 3GPP2 systems, which are wireless communication systems. That is, the self-explanatory steps or parts of the embodiments of the present invention which are not described in order to clearly illustrate the technical idea of the present invention can be supported by the documents. In addition, all terms disclosed in this document may be described by the standard document.

The following description is to be understood as illustrative and non-limiting, such as code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access And can be used in various wireless communication systems. CDMA may be implemented in radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. The TDMA may be implemented in a wireless technology such as Global System for Mobile communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE). OFDMA may be implemented in wireless technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, and Evolved UTRA (E-UTRA). UTRA is part of the Universal Mobile Telecommunications System (UMTS). 3GPP (3rd Generation Partnership Project) LTE (Long Term Evolution) is a part of E-UMTS (Evolved UMTS) using E-UTRA, adopting OFDMA in downlink and SC-FDMA in uplink. LTE-A (Advanced) is the evolution of 3GPP LTE.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following detailed description, together with the accompanying drawings, is intended to illustrate exemplary embodiments of the invention and is not intended to represent the only embodiments in which the invention may be practiced.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same parts are denoted by the same reference numerals throughout the specification.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise. Also, the terms " part, "" module," and " module ", etc. in the specification mean a unit for processing at least one function or operation and may be implemented by hardware or software or a combination of hardware and software have.

In addition, the specific terms used in the embodiments of the present invention are provided to facilitate understanding of the present invention, and the use of such specific terms can be changed to other forms without departing from the technical idea of the present invention .

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a flowchart illustrating a method for reliable voice roaming service in a wireless communication system according to an embodiment of the present invention.

Referring to FIG. 2, the reliable voice roaming service proposed in the present invention can be divided into a step of registering a trusted preferred AP and a step of starting roaming to a preferred AP when a predetermined condition is met.

More specifically, registering an AP corresponding to a voice-only SSID related to a pre-registered data SSID among a plurality of APs having the same voice-only SSID (Service Set Identifier) as a preferred AP (S201), when a signal of a predetermined threshold value or more is detected from the preferred AP (S205) regardless of the signal strength detected from the AP connected to the terminal, step S207 of starting roaming to the reliable access point .

The step S205 is merely an example, and the start condition to which the roaming is connected can be changed by the designer. However, if the strength of a certain signal to a reliable preferred AP is detected, it may be a condition that enables connection at first.

If there is no registered preferred AP through step S201, the conventional roaming method as shown in FIG. 1 may be used.

The pre-registered data SSID (Data SSID) means the data SSID of the AP that the user can trust. A WIFI phone usually remembers its connected AP, which means that the user is a trusted AP.

On the other hand, if the WIFI phone is initially started or the user is not in the area where the user is going, there is no pre-registered data SSID, and a reliable AP must be selected through manual search. Details will be described later.

An SSID (Service Set Identifier) is a unique identifier existing in a header of all packets transmitted through a wireless LAN. That is, it is an identifier of the AP used by the service provider in the wireless LAN to identify different wireless cells. The double hidden SSID is an SSID that can not be searched by the user. In the case of the VoIP service through the AP, the hidden SSID, which can not be searched among the SSIDs, is used for voice only. In particular, in the case of the hidden SSID, the same SSID is detected because it is the same for each AP.

An AP can have multiple SSIDs, each SSID corresponding to a unique BSSID.

Meanwhile, a Basic Service Set Identifier (BSSID) is used to distinguish a 48-bit Basic Service Set (BSS) from a wireless LAN standard 802.11. Normally, it uses the MAC (Medium Access Control) address of the AP, but it is generated with arbitrary values when using IBSS (Independent Basic Service Set) or AD HOC. As described above, in the case of the hidden SSID, the same SSID value is detected, but the corresponding BSSID information is detected as a different unique value.

An AP can have multiple SSIDs, and SSIDs within the same AP have a predetermined relationship. The predetermined relationship will be described later.

In step S201, a specific AP is registered as a preferred AP among a plurality of access points (APs) having the same voice SSID (Service Set Identifier), which will be described with reference to FIG.

FIG. 3A is an exemplary diagram illustrating a data SSID, a hidden SSID, and a corresponding BSSID corresponding to an AP according to an exemplary embodiment of the present invention. FIG. SSID and the corresponding BSSID.

When a user attempts to use a VoIP service using an AP in a wireless communication system, it must be connected to a voice-only SSID. However, in the case of the voice-only SSID, since it uses the hidden SSID, it is difficult to distinguish it from the normal data SSID. Therefore, according to the intensity of the signal, the terminal can start roaming from the specific AP to another AP regardless of the user's preference have.

However, even if the voice dedicated SSID is used to distinguish between the APs using the hidden SSID, since the BSSID information corresponding to each hidden SSID has a unique value for each AP, the user distinguishes the preferred AP through the BSSID The voice service can be received from the corresponding AP.

The present invention proposes a method of registering an AP corresponding to a preferred voice-only SSID using a detectable data SSID.

Referring to FIG. 3A, a plurality of SSIDs may exist in the same AP. In the case of the data SSID, the SSID name can be designated as the Hong Gil Dong PC or the Kim Tae Po PC. It is easy to distinguish, but in the case of the voice-only SSID used for voice only, the HID SSID has only the Hidden SSID and is AP1 or AP2 . For example, the AP 1 may have a plurality of data SSIDs and voice-only SSIDs. As described above, the data SSIDs can be classified as Hong Gil-Dong PCs and Hong Gil Dong gaming devices, but voice-only SSIDs can not be detected as hidden SSIDs. Therefore, the Hidden SSID of AP1 and the Hidden SSID of AP2 can not be distinguished from AP1 or AP2 only by SSID. In contrast, in the case of the BSSID, different BSSIDs can be associated with different SSIDs, and thus different APs can be distinguished by using the BSSID even though they are not classified into SSIDs. The BSSIDs may be mapped, and further, the BSSIDs in the same AP may have a predetermined relationship.

The predetermined relationship means that the difference in the BSSID value between the SSIDs in the same AP can have a predetermined value (e.g., 5) or less. For example, the BSSID for Hong Gil Dong PC is 01: 02: 03: 04: 05: 06, the Hidden SSID is 01: 02: 03: 04: 05: 07, (01: 02: 03: 04: 05) and the last 1 byte (06,07,08) is less than 5 because it is the SSID in the same AP1.

Referring to FIG. 3B, if there is an AP1 that the user can trust, the BSSID of the data SSID detected by the corresponding AP1 is compared with the BSSID of the plurality of hidden SSIDs. If there is a Hidden SSID having a BSSID, the Hidden SSID can be regarded as the voice-only SSID of the AP 1 and the corresponding AP 1 can be registered as a preferred AP.

4 is a flowchart of a method for setting a trusted registration AP in a wireless communication system according to an embodiment of the present invention.

First, when the terminal is first driven or there is no connected data SSID, a reliable AP is selected through manual search (S401), and a second BSSID (Basic Service Set Identifier) corresponding to the data SSID of the AP is detected (S403).

The first BSSID information of a plurality of APs having the same voice only SSID is detected (S405), and an AP corresponding to a BSSID having a predetermined relationship with the second BSSID among the plurality of first BSSIDs is registered as a preferred AP (S409).

At this time, there may be various methods of registering the preferred AP. However, by registering the BSSID itself, the terminal can recognize the AP as a preferred AP, or a separate identification ID is assigned to the AP corresponding to the BSSID, AP, and the above description is only an example of a method of recognizing the terminal as a preferred AP through the above-mentioned process, but the present invention is not limited thereto.

Meanwhile, the predetermined relationship between the first BSSID and the second BSSID includes a relation that the difference from the second BSSID among the plurality of first BSSIDs is equal to or less than a predetermined value.

The predetermined value is preferably 5, because the same AP can have a plurality of SSIDs as described above. If the same AP has a BSSID value difference of less than 5, the BSSID of the data SSID and the BSSID of the plurality of hidden SSIDs By comparison, a specific Hidden SSID having a BSSID that is the same from the previous 5 bytes (for example, 01: 02: 03: 04: 05), but showing only a difference of 5 or less in the last 1 byte The AP having a specific hidden SSID is regarded as an AP such as a data SSID, and the corresponding AP is registered as a preferred AP.

5 is a flowchart illustrating a method for performing reliable voice roaming using a preferred AP in a wireless communication system according to an exemplary embodiment of the present invention.

Referring to FIG. 5, the trusted AP 2 is referred to as a preferred AP as described with reference to FIG. 3 to FIG. 4, and it is assumed that the untrusted AP is AP 1 without going through such a procedure.

The AP 2 is lower than the X (-79) dB (S503) and the unreliable AP (2) is connected to the AP 2 (S501) 1) is greater than Y (Y> X) (e.g., -65) dB (S505), the terminal starts roaming with the AP 1 (S507).

When the signal of the AP 2 is Z (Z <Y) (e.g., -70 dB) or more (S511) when roaming is started and a certain period of time is being connected with the terminal 1 and the AP 1 (S509) If the terminal is waiting (S513), the terminal starts roaming to the AP 2 regardless of the signal strength of the currently connected AP 1 (even if the signal of the new AP 1 is very large) (S513). This is because if the signal strength of a reliable access point satisfies more than a certain level, it is necessary to connect the access point first, rather than to an unreliable AP.

In addition, the condition of S511 is only an example. That is, it is possible to roam if the signal intensity of the AP 2 is maintained at a predetermined value or more. Further, the signal strength of the AP (1) Can be added to the condition.

On the other hand, if the signal of the AP 2 is equal to or higher than ZdB (S511) when the terminal is connected to the AP 1 after the roaming starts and a certain time has elapsed (S4509) The signal of the AP 1 becomes lower than -XdB in step S515 and the signal of the AP 2 should be larger than -YdB in step S517 so that the terminal can start roaming to the AP 2 in step S519. This is because it is more important to prevent a break in the call than to a reliable AP when a call is in progress.

FIG. 6 is a block diagram illustrating a voice roaming service terminal 600 according to an embodiment of the present invention.

Referring to FIG. 6, the voice roaming service terminal 600 according to the embodiment includes a registration unit 610 and a roaming unit 620. It should be clear that the order described is for ease of explanation, by order of time, or by the order in which the contents of the invention are described.

The registering unit 610 detects a plurality of access points (APs) having the same voice SSID (Service Set Identifier) and selects one of the plurality of APs The preferred AP registration unit 613, and the first AP 611. The first AP 611, the second AP 612,

The first detection unit 611 detects a plurality of first BSSIDs corresponding to a plurality of APs having the same voice-only SSID (Service Set Identifier).

The second detection unit 612 detects the second BSSID information corresponding to the previously registered data SSID.

In this case, the WIFI phone can remember the AP that has been connected in the past, and the stored AP is highly likely to be a reliable AP by the user .

If the WIFI phone is not operated or the user is not in the area, the AP will be selected by manual search because the pre-registered data SSID will not exist. In this case, if a reliable AP is selected through the manual search, the WIFI phone remembers the AP even though the WIFI phone does not repeatedly perform the manual search. In this case, the data SSID of the corresponding AP may also be the pre-registered data SSID .

The preferred AP registering unit (613) registers one AP among the plurality of first BSSIDs detected by the first detecting unit, the second BSSID detected by the second detecting unit being less than a predetermined value, as a preferred AP.

As described above, the preferred AP is registered as a preferred AP among the plurality of first BSSIDs in a predetermined relationship with the second BSSID, and a predetermined relationship between the first BSSID and the second BSSID is registered in the preferred BSSID among the plurality of first BSSIDs. 2BSSID and the difference is less than or equal to a predetermined value. The predetermined value is preferably 5, because the same AP can have a plurality of SSIDs as described above. If the same AP has a BSSID value difference of less than 5, the BSSID of the data SSID and the BSSID of the plurality of hidden SSIDs By comparison, a specific Hidden (for example, 01: 02: 03: 04: 05) having the same BSSID as the last 1 byte (for example, 06 and 07) If there is an SSID, an AP having a specific hidden SSID is regarded as an AP such as a data SSID, and the corresponding AP is registered as a preferred AP.

On the other hand, when the predetermined condition is satisfied, the roaming unit 620 starts roaming to the preferred AP, wherein the predetermined condition is preferably a request from the registered access point, regardless of the signal strength detected from the access point connected to the terminal And starts roaming to the registered access point when a signal of a predetermined threshold value or more is detected.

However, it is obvious that the predetermined condition is that roaming can be started if the signal strength of the preferred AP is maintained at a certain value or more, and furthermore, the signal strength of the AP that has been connected to the AP can be added to the condition.

The embodiments described above are those in which the elements and features of the present invention are combined in a predetermined form. Each component or feature shall be considered optional unless otherwise expressly stated. Each component or feature may be implemented in a form that is not combined with other components or features. It is also possible to construct embodiments of the present invention by combining some of the elements and / or features. The order of the operations described in the embodiments of the present invention may be changed. Some configurations or features of certain embodiments may be included in other embodiments, or may be replaced with corresponding configurations or features of other embodiments. It is clear that the claims that are not expressly cited in the claims may be combined to form an embodiment or be included in a new claim by an amendment after the application.

Embodiments in accordance with the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof. In the case of hardware implementation, an embodiment of the present invention may include one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs) field programmable gate arrays, processors, controllers, microcontrollers, microprocessors, and the like.

In the case of an implementation by firmware or software, an embodiment of the present invention may be implemented in the form of a module, a procedure, a function, or the like which performs the functions or operations described above. The software code can be stored in memory and driven by the processor. The memory is located inside or outside the processor and can exchange data with the processor by various means already known.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. Accordingly, the foregoing detailed description is to be considered in all respects illustrative and not restrictive. The scope of the present invention should be determined by rational interpretation of the appended claims, and all changes within the scope of equivalents of the present invention are included in the scope of the present invention.

600: terminal
610: Register
611:
612:
616: Preferred AP Register
620: Roaming part

Claims (14)

A method for performing voice roaming by a terminal in a wireless communication system,
Detecting a plurality of access points (APs) having the same voice dedicated SSID (Service Set Identifier);
Registering, as a preferred AP, an AP having a predetermined relationship with the pre-registered data SSID among the plurality of APs; And
And initiating roaming to the preferred AP if a predetermined condition is met,
Wherein the registering of the preferred AP comprises:
And registering the AP corresponding to the first BSSID corresponding to the second BSSID information corresponding to the previously registered data SSID as a preferred AP by detecting the first BSSID information corresponding to the same voice only SSID. delete The method according to claim 1,
Wherein the registering of the preferred AP comprises:
If the pre-registered data SSID is not found, the AP is selected through manual AP search, the corresponding second BSSID information is detected,
Detecting the first BSSID information corresponding to the same voice only SSID and registering the AP corresponding to the first BSSID having a predetermined relationship with the second BSSID information corresponding to the base registered data SSID as a preferred AP. The method of claim 3,
Wherein the predetermined relationship includes a relationship that the difference from the second BSSID among the plurality of first BSSIDs is less than or equal to a predetermined value,
And registering, as a preferred AP, an AP corresponding to a first BSSID whose difference from the second BSSID is less than or equal to a predetermined value. The method according to claim 1,
The predetermined condition is that,
Wherein a signal exceeding a predetermined threshold value is detected from the preferred AP regardless of a signal strength of an access point connected to the terminal. 6. The method of claim 5,
And the predetermined threshold value is -70 dB. The method according to claim 1,
Wherein the predetermined condition is fulfilled when the terminal is in standby. A terminal for performing voice roaming in a wireless communication system,
A registration unit detecting a plurality of access points (APs) having the same voice dedicated SSID (Service Set Identifier) and registering APs having a predetermined relationship with the previously registered data SSID among the plurality of APs as a preferred AP; And
And a roaming unit for starting roaming to the preferred AP when a predetermined condition is satisfied,
Wherein the register detects first BSSID information corresponding to the same voice-only SSID and registers an AP corresponding to a first BSSID having a predetermined relationship with second BSSID information corresponding to the previously registered data SSID as a preferred AP. 9. The method of claim 8,
Wherein the registration unit comprises:
A first detecting unit detecting a plurality of first BSSIDs corresponding to the same voice only SSID;
A second detecting unit detecting second BSSID information corresponding to the previously registered data SSID; And
A preferred AP registering unit which registers, among the plurality of first BSSIDs detected by the first detecting unit, the second BSSID detected by the second detecting unit and an AP corresponding to a first BSSID whose difference is equal to or less than a predetermined value, as a preferred AP; . 10. The method of claim 9,
Wherein the second detection unit comprises:
If the pre-registered data SSID does not exist, selecting an AP through manual AP search and detecting second BSSID information. 9. The method of claim 8,
The predetermined condition is that,
Wherein the signal is performed when a signal of a predetermined threshold value or more is detected from the preferred AP and the terminal is in the waiting state regardless of the signal strength of the access point being connected to the terminal,
And the predetermined threshold value is -70 dB. delete delete delete

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