KR101342643B1 - Apparatus and method for setting up paging group in broadband wireless communication system - Google Patents

Abstract

The present invention relates to an apparatus and method for setting a paging group in a broadband wireless communication system, comprising: a call management unit for outputting handover occurrence information of a terminal to a control unit, a storage unit for storing the paging group setting information for each terminal; A control unit for determining a paging group size of the terminal using the handover occurrence frequency and updating setting information stored in the storage unit, and setting a paging group in consideration of the movement of the terminal, thereby eliminating unnecessary paging groups. It can reduce data flow and prevent repetitive paging due to paging failure.

Broadband Wireless Communication System, Paging Group, Handover

Description

Apparatus and method for setting up a paging group in a broadband wireless communication system {APPARATUS AND METHOD FOR SETTING UP PAGING GROUP IN BROADBAND WIRELESS COMMUNICATION SYSTEM}

1 is a diagram schematically illustrating paging group classification in a general broadband wireless communication system;

2 is a block diagram illustrating a paging group setting apparatus in a broadband wireless communication system according to the present invention; and

3 is a diagram illustrating a procedure for setting a paging group in a broadband wireless communication system according to the present invention.

The present invention relates to paging in a broadband wireless communication system, and relates to an apparatus and method for setting a paging group size in a broadband wireless communication system.

In the 4th Generation (hereinafter referred to as 4G) communication system, which is the next generation communication system, active researches are being conducted to provide users with services having various service qualities having a transmission rate of about 100 Mbps. In particular, the current 4G communication system to support high-speed services in the form of guaranteeing mobility and quality of service (QoS) to broadband wireless access communication systems such as wireless local area network network system and wireless urban area network system Research is being actively conducted. In addition, the representative communication system is the Institute of Electrical and Electronics Engineers (IEEE) 802.16 communication system.

The IEEE 802.16 communication system uses orthogonal frequency division multiplexing (OFDM) / orthogonal frequency division multiple access (OFDMA) scheme to support a broadband transmission network on a physical channel. This is a communication system applied. Studies are being actively carried out in order to secure mobility of a terminal and flexibility of a wireless network configuration in the IEEE 802.16 communication system and to provide a more efficient service in a wireless environment in which traffic distribution and call volume change are severe.

In order for the terminal to receive continuous service while moving, the communication system must maintain information of the cell and the base station where the terminal is located. In the case of a terminal in a normal mode state, since communication is continuously performed, the system may maintain information of a cell and a base station where the terminal is located. However, the terminal in the idle mode (Idel Mode) state does not communicate, it is not possible to maintain the base station information according to the movement. Therefore, when a location of the idle mode terminal is to be confirmed in a communication system, as shown in FIG. 1, all base stations in a paging group including a predetermined number of base stations transmit a paging message to the idle mode terminal. .

The communication system may transmit a paging message in units of the paging group, and the terminal may identify the paging group in which the terminal is currently located by receiving the paging message. In this case, when it is confirmed that the paging group to which the terminal belongs is changed, the terminal performs a location update to inform the communication system that its location has changed.

In general, in a broadband wireless communication system, the size of the paging group, that is, the number of base stations included in one paging group is statically set. Accordingly, the set number of base stations performs the paging even when any terminal in the idle mode does not move. In this case, there is a problem that unnecessary data flow occurs. On the contrary, in the case of a fast moving terminal, paging fails due to a set number of base stations performing paging. That is, since the terminal has already left the existing paging group and performs paging again in the neighboring paging group, the number of paging attempts increases.

Accordingly, an object of the present invention is to provide an apparatus and method for dynamically adjusting a paging group size in a broadband wireless communication system.

Another object of the present invention is to provide an apparatus and method for managing a paging group size for each terminal in consideration of a handover occurrence rate and a moving speed of the terminal in a broadband wireless communication system.

According to a first aspect of the present invention for achieving the above object, a base station controller in a broadband wireless communication system, the call management unit for outputting the handover occurrence information of the terminal to the control unit, and stores the paging group setting information for each terminal; And a controller configured to determine a paging group size of the terminal by using the handover occurrence frequency and to update setting information stored in the storage.

According to a second aspect of the present invention for achieving the above object, a method for setting a paging group in a broadband wireless communication system, the step of checking the frequency of handover occurrence of the terminal, the paging of the terminal by using the frequency of the handover Determining a group size, and updating paging group configuration information for the terminal.

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, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

Hereinafter, a description will be given of a technique for setting a paging group size according to a movement degree of a terminal in a broadband wireless communication system. The invention should be practiced in an apparatus that is in a location capable of receiving information from multiple base stations. Accordingly, the present invention is applied to an apparatus existing at an upper end of the base station in a communication system structure, which will be referred to as a 'base station controller' in the following description.

2 is a block diagram of a base station controller in a broadband wireless communication system according to the present invention.

As shown in FIG. 2, the base station controller includes a controller 201, a communication unit 203, a call manager 205, and a paging setting storage unit 207.

The controller 201 controls the overall function of the base station controller. The communication unit 203 performs an interfacing function for communicating with other network entities (eg, base stations) in the communication system. The call manager 205 performs a function for handling call connection, disconnection, and handover of a terminal. The paging setting storage unit 207 stores reference information used when performing paging for the idle mode terminal.

In particular, according to the present invention, the control unit 201 updates paging group setting information of each terminal stored in the paging setting storage unit 207 according to a set period. In addition, in order to update the paging group setting information, the controller 201 continuously monitors the handover rate of each terminal by referring to the handover information of each terminal processed by the call manager 205 (Mornitoring). )do. In other words, the control unit 201 calculates a paging group size of each terminal according to a paging group setting information update period, and modifies the setting information stored in the paging setting storage unit 207. The process of calculating the paging group size will be described in detail with reference to FIG. 3.

3 illustrates a procedure for setting up a paging group in a broadband wireless communication system according to the present invention.

Referring to FIG. 3, the control unit 201 continuously monitors a serving base station change, that is, a handover situation, in step 301.

In step 303, the controller 201 determines whether a paging group configuration update cycle is performed.

If it is not the paging group setting update period, the controller 201 returns to step 301 to continuously monitor the handover situation of the terminal.

On the other hand, if the paging group configuration update period, the control unit 201 proceeds to step 305 to calculate the movement distance per unit time of the terminal. For example, the moving distance per unit time of the terminal is calculated as in Equation 1 below.

In Equation 1, L denotes a moving distance per unit time of a terminal, HO _r denotes a handover occurrence rate of a corresponding terminal, and BS _r denotes a radius of base station cell coverage. That is, as shown in Equation 1, the approximate movement distance of the terminal is calculated using the base station cell coverage and the handover occurrence rate of the terminal.

After calculating the movement distance per unit time of the terminal, the control unit 201 proceeds to step 307 to determine the paging group radius of the terminal. For example, the paging group radius is calculated as in Equation 2 below.

In Equation 2, PG _r is a paging group radius for a corresponding UE, L is a moving distance per unit time of the UE calculated through Equation 1, and PC _t is a paging execution time interval. Denotes a weight that depends on the configuration of the system.

After determining the paging group radius, the control unit 201 proceeds to step 309 to update the paging group setting information of the terminal stored in the paging setting storage unit 207. That is, base stations located within the determined radius around the base station where the terminal is located at the current time point are set as a paging group for the corresponding terminal.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments, but is capable of various modifications within the scope of the 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.

As described above, by setting the paging group in consideration of the movement of the terminal in the broadband wireless communication system, it is possible to reduce unnecessary data flow due to the paging, and to prevent repetitive paging due to the paging failure.

Claims (8)

In the base station controller in a broadband wireless communication system, A call manager which outputs handover occurrence information of the terminal to the controller; A storage unit for storing paging group setting information of the terminal; A control unit for determining a radius of a paging group of the terminal by using the handover occurrence frequency and updating setting information stored in the storage unit; The control unit calculates a moving distance per unit time of the terminal by using a handover occurrence frequency of the terminal, determines a radius of the paging group to be proportional to the moving distance per unit time and a paging execution time interval, and then And a base station within a radius of the paging group around the current serving base station as a paging group of the terminal. The method according to claim 1, And the control unit updates the setting information according to a predetermined period. The method according to claim 1, The controller is characterized in that for calculating the movement distance per unit time as shown in the following formula,

Where L is a moving distance per unit time, HO _r is a handover occurrence rate of the UE, and BS _r is a radius of base station cell coverage. The method according to claim 1, The control unit, characterized in that for determining the radius of the paging group as shown in the following formula,

Where PG _r is a paging group radius, L is a moving distance per unit time of the terminal, PC _t is a paging execution time interval, and W is a weight depending on a system setting. In the method of setting up a paging group in a broadband wireless communication system, Checking a handover frequency of the terminal; Calculating a moving distance per unit time of the terminal using a frequency of handover occurrence of the terminal; Determining a radius of the paging group to be proportional to the movement distance per unit time and a paging execution time interval; And after determining the radius of the paging group, setting the base stations within the radius of the paging group as the paging group of the terminal around the serving base station of the terminal. 6. The method of claim 5, The setting for the paging group of the terminal is updated every predetermined period. 6. The method of claim 5, The moving distance per unit time is calculated as in the following formula,

Where L is a moving distance per unit time, HO _r is a handover occurrence rate of the UE, and BS _r is a radius of base station cell coverage. 6. The method of claim 5, The radius of the paging group is characterized in that it is calculated as in the following formula,

Where PG _r is a paging group radius, L is a moving distance per unit time of the terminal, PC _t is a paging execution time interval, and W is a weight depending on a system setting.

Images