KR100625446B1 - Terminal mobility processing method in wireless communication network - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a terminal mobility processing method in a wireless communication network and a computer readable recording medium having recorded thereon a program for realizing the method.

2. The technical problem to be solved by the invention

The present invention provides a mobility processing method for providing flexibility to a connection of a user terminal in a wireless communication network environment including a broadband wireless subscriber network (B-WLL) and guaranteeing mobility when the terminal moves, and a program for realizing the method. To provide a computer-readable recording medium.

3. Summary of Solution to Invention

According to an aspect of the present invention, there is provided a method for processing mobility of a terminal in a wireless communication network, the method comprising: providing a repeater for relaying a frequency of a wireless section to a home section in a physical layer of the wireless communication network; Managing location information of the terminal by a wireless access device in a base station; And based on the location information of the terminal, the wireless access device polling only a corresponding terminal existing in its area through a frequency channel relayed from the repeater to ensure mobility of the terminal.

4. Important uses of the invention

The present invention is used in related equipment and services related to broadband subscriber network.

Broadband Wireless Subscriber Network (B-WLL), Mobility, Location Registration, Home Area, Physical Layer

Description

Method for processing mobility in broadband wireless local loops}

1 is a block diagram of a typical broadband wireless subscriber network (B-WLL).

2 is an exemplary configuration diagram of a broadband wireless subscriber network (B-WLL) to which the present invention is applied.

3 is a flowchart illustrating an embodiment of a network access process of a user terminal in a terminal mobility processing method according to the present invention;

4 is an explanatory diagram showing a terminal mobility processing method according to the present invention.

5 is an exemplary configuration diagram of a system for a terminal mobility processing method according to the present invention;

6 is a flowchart illustrating an embodiment of a location registration process in a terminal mobility processing method according to the present invention;

7 is a diagram illustrating an embodiment of a terminal authentication process in a terminal mobility processing method according to the present invention;

* Explanation of symbols for the main parts of the drawings

10: base station 11: network access control unit

12: Air interface unit (AIU) 13: Network interface unit (NIU)

14,16: user terminal 15: network interface repeater (NIU-R)

51: terminal position memory 52: current position memory

71: user terminal information storage device 72: authentication center

73: authentication module

The present invention provides a mobility processing method and the method for providing flexibility in the connection of the user terminal in a wireless communication network (preferably Broadband Wireless Local Loop (BLL-WLL)) environment and ensure mobility when the terminal is moved. The present invention relates to a computer-readable recording medium having recorded thereon a program for realizing this.

1 is an exemplary view of a broadband wireless subscriber network (B-WLL) to which the present invention is applied. In the drawing, "10" is a base station, "11" is a network access controller, and "12" is an air interface device (AIU: Air). Interface Unit), "13" represents a network interface unit (NIU: Network Interface Unit), and "14" represents a user terminal.

In a broadband wireless subscriber network (B-WLL) environment, the interval between the base station 10 and the user terminal 14 may be divided into two parts.

As shown in FIG. 1, the section 21 between the radio interface device 12 of the base station 10 and the network interface device 13 on the terminal side is a radio section mainly using a frequency of 24 to 28 kHz. Multiple accesses of the radio section 21 use time-division multiple access and time-division multiplexing respectively.

The network interface device 13 transmits data of various user terminals 14 in a predetermined format through the radio section 21 under the control of the radio interface device 12 of the base station 10. .

Access to the uplink channel of the network interface device 13 is entirely controlled by a Media Access Control (MAC) message by the base station 10.

Since the network interface device 13 and the user terminal 14 are connected to the wired section 22, the user terminal 14 is connected to the wireless section 21 through the network interface device 13 without any recognition of the wireless section. Information can be sent.

In the broadband wireless subscriber network, the wired connection between the home section 22, that is, the network interface device 13 and the user terminal 14 fixes the position of the user terminal 14 and provides mobility to the user terminal 14. Can't.

Therefore, a method of providing flexibility to the connection of the user terminal 14 and giving mobility to the user terminal 14 is essential in the indoor section 22 having such a structure.

The present invention devised to meet the above requirements, the mobility processing to provide flexibility in the connection of the user terminal in a wireless communication network environment including a broadband wireless subscriber network (B-WLL) and to ensure mobility when the terminal moves It is an object of the present invention to provide a computer-readable recording medium having recorded thereon a method and a program for realizing the method.

According to an aspect of the present invention, there is provided a method for processing mobility of a terminal in a wireless communication network, the method comprising: providing a repeater for relaying a frequency of a wireless section to an indoor section at a physical layer of the wireless communication network; Managing location information of the terminal by a wireless access device in a base station; And based on the location information of the terminal, the wireless access device polling only a corresponding terminal existing in its area through a frequency channel relayed from the repeater to ensure mobility of the terminal. do.

On the other hand, the present invention, a wireless communication system having a processor, a function for providing a repeater for relaying the frequency of the radio section in the indoor section of the physical layer of the wireless communication network; A function of the wireless access device in the base station to manage location information on the terminal; And a program for realizing a function of guaranteeing mobility of the terminal by polling only a corresponding terminal existing in its area through a frequency channel relayed from the repeater based on the location information of the terminal. Provide a computer readable recording medium.

In the B-WLL environment, the section between the user interface (NIU) and the user terminal and the home section are basically wired. The present invention is to design a physical layer wireless relay system for providing flexibility to the connection of the user terminal in the indoor section of the structure and to provide mobility to the terminal, and present the necessary location management function as the terminal moves.

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.

FIG. 2 is an exemplary configuration diagram of a broadband wireless subscriber network (B-WLL) to which the present invention is applied. In the drawing, "15" is a network interface unit-relay (NIU-R) and "16" is mobility. Represents a given user terminal. This shows an example of a system configuration that provides mobility to the user terminal 16 through wirelessization of the indoor section 23.

As shown in FIG. 2, the B-WLL to which the present invention is applied is configured to transmit data through a wireless section, which is a function of the network interface device 13, in the existing broadband wireless subscriber network. The network interface repeater 15 performs the role of relaying the frequency of the wireless section 21 to the indoor section 23 in the physical layer.

The physical layer relay method by the network interface repeater 15 may be divided into a method of relaying all frequency bands of the wireless section 21 of the broadband wireless subscriber network and a method of selecting and relaying only some frequency bands.

In the method of selecting and relaying some frequency bands, the bandwidth arbitrarily selected by the network interface repeater 15 is relayed, but in order to operate more systematically, the downlink frequency band of the radio section 21 of the broadband wireless subscriber network is varied. The network interface repeater 15 may select one of the channel groups to relay by grouping by the number of. At this time, the frequency band of the indoor section 23 may be fixed to a predetermined bandwidth. In addition, the frequency band of the indoor section 23 may use a lower frequency band than the wireless section 21 of the broadband wireless subscriber network to accommodate the user terminal 16 more economically.

In order for the network interface repeater 15 to perform the above functions to actively and arbitrarily select a frequency band, the MAC protocol must be operated between the radio interface device 12 and the network interface repeater 15. In order to implement 15) as a repeater using only the physical layer, the relay channel is selected by hardware adjustment at the time of pre-installation.

In the above environment, when the MAC of the B-WLL system for providing mobility to the user terminal 16 conforms to the standard DAVIC (DAVIC: Digital Audio Virtual Council) (ver1.5 specification) standard. The wireless network connection of the user terminal 16 is made through polling.

3 is a flowchart illustrating a network access process of a user terminal in a method of processing a terminal mobility according to the present invention, in which a user terminal 16 is a time-division multiple access method in a broadband wireless subscriber network (B-WLL). The procedure of accessing a slot and assigning a slot is shown.

Step 31 is a procedure in which the user terminal 16 is polled by the air interface device 12.

The opportunity for the user terminal 16 to access the uplink channel may be obtained through polling by the air interface device 12. That is, when there is data to be transmitted by the user terminal 16, the radio interface device 12 searches for a downlink channel polling the user terminal 16 itself, receives the polling request 31, and then designates an uplink channel designated by the polling request. By performing the polling response 32 through the synchronization of the uplink frame, and then it can request the radio resource allocation (35), it is possible to transmit data through the allocated radio resources.

Step 33 is a transmission time calibration procedure for transmission at the correct slot boundary of the uplink channel, and Step 34 is an ATM (Metal Communication Control) message for the medium access control (MAC) message between the air interface device 12 and the user terminal 16. This is the procedure for Asynchronous Transfer Mode connection.

The radio interface device 12 performs an uplink contention-based slot that can simultaneously use an upslot request with other network interface devices to allocate radio resources. Informs whether the interface device has been received without conflict with the message.

In the case where the user terminal 16 moves between an area of another network interface repeater 15 or an area of the base station 10 in a mobile DAVIC-based broadband wireless subscriber network environment (see FIG. 4), a wireless interface device The communication of the user terminal 16 is possible only when the user terminal 16 polls the user terminal 16 through the frequency channel relayed by the network interface repeater 15 to which the user terminal 16 has moved.

In the existing broadband wireless subscriber network environment, the user terminal 14 existing in the area of the air interface device 12 is fixed, but the user terminal existing in the area of the air interface device 12 when the user terminal 16 moves. Since 16 is variable, the air interface device 12 should poll only the user terminal 16 present in its area. To this end, the air interface device 12 must perform location management for each user terminal 16.

In the location management method of the user terminal 16 of the radio interface device 12, the user terminal 16 is connected to the base station 10 whenever the user terminal 16 moves between the areas of the network interface repeater 15 or the areas of the base station 10. It can be classified into a method of registering its own location and a method of registering its own location regardless of the movement of the location each time the user terminal 16 is turned on.

In each of these cases, elements and procedures to be additionally introduced into the broadband wireless subscriber network environment for location management of the user terminal 16 are as follows.

In the case of registering its own location only when moving to a new area, the user terminal 16 recognizes its own location when moving between areas of the base station 10 or between areas of the network interface repeater 15, In order to register a location, information about a location must be broadcasted through the air interface device 12. In the existing broadband wireless subscriber network environment, since there is no broadcast method, a broadcast means must be additionally defined.

Here, as the location information broadcasting method, there are a method of defining a separate broadcast channel and a method of adding a new location information message to a medium access control message through an existing downlink channel.

When defining a broadcast channel, one downlink narrowband broadcast channel may be defined for each channel group in a broadband wireless subscriber network section, and may be mapped to the first channel of a home section having a fixed frequency. Therefore, the user terminal 16 obtains the location information through the first channel of the indoor section in order to know whether the location moves. The location information delivered through the broadcast channel may be a base station identifier and a number of a channel group to which the broadcast channel belongs.

On the other hand, when defining and using a new location information medium access control message, the air interface device 12 must transmit the location information message periodically over all downlink channels. Here, the location information message includes information such as a base station identifier and a channel group number to which the downlink channel to which the message is transmitted belongs. Accordingly, the user terminal 16 can know whether the position moves through this message.

In the existing broadband wireless subscriber network, since there is no element related to location management in the air interface device 12, the following elements should be added to the base station 10 and the user terminal 16 for location management.

Fig. 5 is an exemplary configuration diagram of a system for a terminal mobility processing method according to the present invention, in which “51” denotes a terminal position memory device and “52” denotes a current position memory device, respectively.

As shown in FIG. 5, the system for a terminal mobility processing method according to the present invention includes a terminal position storage device 51 and a current position memory for position management of a user terminal 16 in a system of an existing broadband wireless subscriber network. The apparatus 52 is provided at the base station 10 and the user terminal 16, respectively.

As shown in Fig. 5, the user terminal position storage device 51 is an additional element on the base station 10 side, and the serial number of the user terminal 16 and the user terminal 16 located in the area of the radio interface device 12. It stores the channel group number relayed by the network interface repeater 15 to which it belongs.

The radio interface device 12 refers to the terminal location memory 51 when polling the user terminal 16.

The current position storage device 52 is an element added to the user terminal 16 and is a device that stores information about the current position of the user terminal 16.

In order to register the location via the location information from the base station 10, the user terminal 16 is connected to the location information of the terminal currently stored in the location storage device 52 and the current location through the location information from the base station 10. If the location information is wrong, perform the location registration procedure. At this time, the information that the user terminal 16 should transmit to the base station 10 for location registration is the serial number of the user terminal 16 and the air interface device 12 of the previous location stored in the current location memory 52. Identifiers and channel group numbers. This is to delete the registered information of the user terminal 16 from the terminal position memory 51 of the previous air interface device 12 when the area of the air interface device 12 has moved. In addition, when moving between the areas of the network interface repeater 15, the terminal position storage device 51 updates the channel group number that the user terminal 16 can receive.

In the existing DAVIC-based broadband wireless subscriber network, the user terminal 16 must receive polling from the air interface device 12 in order to access an uplink slot. However, when the user terminal 16 moves to the area of the new air interface device 12, it cannot be polled because the user terminal 16 is in a state before the user terminal 16 is registered in the terminal position storage device 51. Therefore, the user terminal 16 can perform the location registration procedure only if it can access the upstream channel arbitrarily without polling. As a method for this, a method of defining a new uplink channel that can be competitively accessed by all user terminals 16 requiring location registration without a polling procedure, and a location registration procedure must be performed by designating a specific slot in the existing uplink channel. There is a way to make only user terminals 16 accessible. Detailed description of each method is as follows.

An uplink channel defined for location management is designated through a downlink broadcast channel or a broadcast message, and is used for accessing an initial wireless channel for location management. In addition, all slots of the channel are defined as contention-based slots. User terminals 16 requiring location registration via this channel competitively request uplink and slot allocation required for the location management procedure. In this case, the reason for requesting a separate individual slot is because the location registration procedure time may be delayed indefinitely due to competition-based characteristics when the location registration message and the authentication message are transmitted through the contention-based slot channel.

A slot defined for location management is a slot accessible only by user terminals 16 that require location registration as a slot designated through a downlink broadcast channel or a broadcast message. This slot is a contention-based slot and should be followed by a sufficient protection slot because it is a slot accessed by the user terminal 16 without calibration for the uplink channel. In the same manner as the contention-based slot channel designation method, the UL channel and slot allocation required for the location management procedure are requested.

Unlike the method of performing the location registration process only when moving to the other area, additional elements and procedures in the case of registering the location regardless of the positional change whenever the user terminal 16 is turned on are as follows.

The method of registering a location regardless of the positional change every time the user terminal 16 is turned on does not need to obtain information on the position from the air interface device 12. Therefore, there is no need for a separate means for transmitting the position information downward.

However, the air interface device 12 must provide a slot or channel that the user terminal 16 can access for location registration without polling and calibration procedures, and must generate a message specifying this.

When the power is turned off, the wireless interface device 12 does not need to poll the user terminal 16, and registers its position again when the power is turned on, so that the user terminal 16 deletes its location registration before the power is turned off. Since the message is sent to the air interface device 12, the position registration information of the user terminal 16 is deleted from the terminal position storage device 51.

The uplink channel access method for location registration is the same as the location registration method when the location moves.

The location registration procedure listed above will be described in more detail with reference to FIG. 6.

6 is a flowchart illustrating a location registration process in a terminal mobility processing method according to the present invention.

Step 61 shows the primary procedure of the location registration procedure of the user terminal 16 through the location information from the air interface device 12, and the location information through the broadcast channel or the broadcast message from the air interface device 12. This is the procedure of specifying uplink and uplink access channels and slots.

Step 62 is a procedure for specifying an upwardly accessible channel and slot in a method of registering a position regardless of a change in position each time the user terminal 16 is powered on without position information. After performing this procedure 62, the user terminal 16 makes a slot request for the location registration procedure through a designated uplink channel or slot.

The following procedures 63 to 71 are performed in the same manner regardless of the previous two methods.

Step 63 is a message for requesting polling, in order to follow the existing polling-based MAC protocol procedure.

Steps "64" to "68" are the same as the procedure for assigning slots in response to polling in the existing DAVIC-based broadband wireless subscriber network. The slot assigned through this process is a slot for location registration.

The wireless interface device 12 receiving the location registration request 69 of the user terminal 16 goes through a user terminal authentication procedure 70. At this time, if the authentication is successful, the wireless interface device 12 registers the user terminal 16 in the terminal location memory 51 and informs whether or not the location registration is successful through step "71".

As such, when the user terminal 16 that has moved requests the location registration, the wireless interface device 12 must go through an authentication procedure 70 for checking whether the user terminal 16 is a serviceable user terminal. Additional elements and procedures for certification include:

7 is a diagram illustrating an embodiment of a terminal authentication process in the terminal mobility processing method according to the present invention, in which "71" is a user terminal information storage device, "72" is an authentication center, and "73" is authentication. Represent each module.

The user terminal information storage device 71 stores all the user's information to provide the user's information during the authentication procedure, and provides the base station 10 with the user's service option information.

The authentication center 72 is for user authentication and is responsible for driving an authentication algorithm. For example, the authentication center 72 obtains a user's unique key value from the user terminal information storage device 71 when there is a user authentication request on the base station 10 side, and randomly generated randomly generated user value and the user terminal 16. Run authentication algorithm with serial number of. Thereafter, after the authentication algorithm is completed, a count value that records the number of times of communication is obtained from the user terminal information storage device 71, and transmitted along with the authentication algorithm driving result and the random number value to the base station 10 as a response to the authentication request.

The authentication module 73 in the user terminal 16 records information on the user, and incorporates the same authentication algorithm as the authentication center 72 side.

The authentication module 73 uses the random number value from the authentication center 72 side, the embedded user key value, and the serial number of the user terminal 16 in the authentication request 703 from the base station 10 side. Drive.

The base station 10 may obtain the serial number of the user terminal 16 by receiving the location registration message. Using this, the authentication is requested to the authentication center 72 (701). At this time, the authentication center 72 receives the authentication request and operates the authentication algorithm to transmit a response to the authentication request including the random number (Rn), the algorithm driving result (Ar), and the count value (Count). It is transmitted to the interface device 12. Upon receiving this, the base station 10 transmits an authentication request message including a random number value to the user terminal 16 (703). The authentication module 73 of the user terminal 16 that receives this transmits the authentication algorithm result and the count value to the air interface device 12 (704).

The base station 10, which has received the authentication parameters from the authentication center 72 and the user terminal 16, respectively, compares them (705), which means that authentication succeeds, and thus the user terminal is stored in the terminal position storage device 51. (16), and transmits a location registration success message to the user terminal 16 side (706). If the parameters of both sides are incorrect, the authentication fails. Therefore, a message indicating that the location registration has failed is transmitted to the user terminal 16 (706).

The present invention described above is capable of various substitutions, modifications, and changes without departing from the spirit of the present invention for those skilled in the art to which the present invention pertains, and the above-described embodiments and accompanying It is not limited to the drawing.

As described above, the present invention can provide flexibility in the connection of the user terminal and guarantee the mobility of the terminal in the home section under the broadband wireless subscriber network environment, thereby contributing to the activation of the service of the broadband wireless subscriber network.

Claims (10)

In the method of processing the mobility of a terminal in a wireless communication network, Providing a repeater for relaying a frequency of a wireless section to an indoor section in the physical layer of the wireless communication network; Managing location information of the terminal by a wireless access device in a base station; And Ensuring the mobility of the terminal by polling only a corresponding terminal existing in its area through a frequency channel relayed by the repeater based on the location information of the terminal; Terminal mobility processing method in a wireless communication network comprising a. The method of claim 1, The repeater, A method for processing terminal mobility in a wireless communication network, comprising relaying all frequency bands of a wireless section of a broadband wireless subscriber network (B-WLL). The method of claim 1, The repeater, Selecting and relaying only a part of frequency bands of a wireless section of a broadband subscriber network (B-WLL), and selecting and relaying one of the channel groups by grouping the channels of the downlink frequency band of the wireless section into a variable number. Terminal mobility processing method in a wireless communication network. The method according to any one of claims 1 to 3, In the step of managing the location information for the terminal by the wireless access device, At the time of location registration of the terminal, the base station recognizes the location movement through the location information from the base station and attempts to register the location, wherein the base station locates one narrowband channel of the downlink channel group to transmit the location information to the terminal. A terminal mobility processing method in a wireless communication network, characterized in that used as defined as a broadcast channel for information transmission, or define a new slot for informing location information on an existing channel. The method according to any one of claims 1 to 3, In the step of managing the location information for the terminal by the wireless access device, When the terminal moves, the base station stores the serial number of the terminal existing in the base station area and the channel group number relayed by the repeater so that the wireless access device refers to the terminal polling. And storing the current location of the terminal to determine the necessity of location registration by comparing with the location information from the base station. The method according to any one of claims 1 to 3, In the step of managing the location information for the terminal by the wireless access device, In order to allow the terminal to randomly access the uplink channel without polling, a terminal in a wireless communication network defining a new uplink channel that can be competitively accessed by all terminals requiring location registration without a polling procedure. Mobility processing method. The method according to any one of claims 1 to 3, In the step of managing the location information for the terminal by the wireless access device, In order to allow the terminal to access the uplink channel arbitrarily without polling, a new contention slot is provided so that only the corresponding terminals that need to perform a location registration procedure by designating a specific slot in the existing uplink channel can access it. Terminal mobility processing method in a wireless communication network. The method according to any one of claims 1 to 3, In the step of managing the location information for the terminal by the wireless access device, When moving the location of the terminal, after receiving location information from the base station for location registration, if a location registration is required, without receiving polling, accessing an uplink channel randomly and requesting slot allocation for a location management procedure A method for processing terminal mobility in a wireless communication network, comprising transmitting a location registration message using an assigned slot and notifying a success or failure of location registration through an authentication procedure. The method according to any one of claims 1 to 3, In the step of managing the location information for the terminal by the wireless access device, For authentication of the terminal, the authentication center is located on the base station side, and the first authentication algorithm is driven using the serial number and unique key of the terminal and a random number randomly generated as parameters, and the authentication module is placed on the terminal side. In a wireless communication network, a second authentication algorithm is driven using a serial number and a unique key and a random number randomly generated as a parameter, and the results of the first and second authentication algorithms are compared to authenticate the terminal. Terminal mobility processing method. In a wireless communication system having a processor, A repeater for relaying the frequency of the wireless section to the home section in the physical layer of the wireless communication network; A function of the wireless access device in the base station to manage location information on the terminal; And Based on the location information of the terminal, the wireless access device polls only the corresponding terminal in its area through the frequency channel relayed by the repeater to ensure the mobility of the terminal A computer-readable recording medium having recorded thereon a program for realizing this.

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