KR100939355B1 - System and method for idle mode control in wireless communication system - Google Patents

Abstract

The present invention relates to an idle mode control system and a method thereof in a mobile communication system.

The present invention enables to control the terminal idle mode to minimize the power of the terminal and minimize the network re-entry procedure in the WiBro system of the mobile communication system.

Accordingly, the location information of the terminal can be updated, and the network re-entry process of the terminal can be simplified, thereby reducing network re-entry time. In addition, by managing the paging information and network re-entry retention information of the idle mode terminal in the paging controller, it is possible to minimize the communication control traffic for information sharing, and to perform the network re-entry process of the terminal using the paging procedure, Incoming call establishment service can be provided.

Mobile communication system, Idle mode, IP, MAC, Paging

Description

Idle mode control system and method for mobile communication system {System and method for idle mode control in wireless communication system}

The present invention relates to a system and method for controlling an idle mode in a mobile communication system.

One of the various mobile communication systems, WiMax (also called WiBro, hereinafter referred to as WiBro), uses wireless transmission technology that guarantees spectrum use efficiency in the 2.3 GHz frequency band, and various types of IP-based wireless data provided by the wired Internet. It is a 3.5 generation mobile communication system that provides services (eg streaming video, FTP, mail, chat, etc.) using video and high-speed packet data transmission.

In general, most mobile communication systems support the idle mode to minimize power consumption of the terminal. Since the terminal does not perform the handoff procedure when the UE moves between the base stations included in the same paging area during the idle mode, the handoff procedure of the terminal is omitted, thereby reducing power.

Conventional idle mode operation may be described by a network entity and a terminal managing a paging group and a paging group composed of a plurality of base stations. The network entity controls a series of operations in the conventional idle mode described below.

The network entity may mean a base station that controls the terminal, that is, a service base station or a controller provided in the base station. The controller may be provided within the base station or externally. The paging area is defined as an entire area that is handled by a plurality of base stations, called paging groups. Base stations included in the same paging area have the same value of paging period and paging offset.

The terminal may request the base station to switch to the idle mode, and the base station transmits its paging area ID, the paging period and the paging offset to the terminal, thereby switching the terminal to the idle mode. During the idle mode, the terminal may determine whether to continuously maintain or terminate the idle mode through paging transmitted from the base station in the broadcast mode for each paging period promised.

When traffic to be transmitted to the base station occurs in the terminal in the idle mode, the terminal may terminate the idle mode at any time. When traffic to be transmitted to the idle mode occurs, the base station causes the terminal to terminate the idle mode through paging.

When the terminal in the idle mode does not receive the paging at a predetermined time due to moving to another paging area or losing synchronization, the terminal terminates the idle mode. In conclusion, as long as there is no transmission / reception information, the terminal in the idle mode can be guaranteed free movement in the same paging area by performing periodic paging without performing a handoff procedure. The general procedure for the terminal to switch to the idle mode is as follows.

The terminal delivers an idle mode request message to the serving base station in order to switch to the idle mode. Upon receiving the idle mode request message, the service base station transmits a paging group ID, a paging cycle, and a paging offset value to the terminal with an idle mode response message, and releases connection information with the terminal and radio resources allocated to the terminal. In addition, the serving base station notifies the base station of the paging group to which the MAC address of the terminal to switch to the idle mode, so that the terminal can be paged in the same paging period.

On the other hand, if the terminal is permitted to switch to the idle mode through the idle mode response message, whether there is downlink traffic delivered to itself through a paging message in the form of a broadcast delivered from the base station according to a paging cycle, and whether ranging should be performed? If not, determine if it should remain in idle mode.

When the terminal receives the downlink traffic through the paging message, the terminal exits the idle mode and reenters the network to receive the downlink traffic. In addition, when the terminal is requested to perform ranging through a paging message, the terminal performs the ranging so that the base station updates the terminal list of the terminal and the valid idle mode.

On the other hand, if the terminal is received so as not to perform any action through the paging message, and maintains the idle mode state without a specific action. If the uplink or downlink traffic occurs or the paging group is moved to another base station and the terminal terminates the idle mode, the base station notifies the base stations belonging to the same paging group to delete the corresponding terminal from the idle mode terminal list. .

In the prior art as described above, when a terminal in an idle mode moves to a base station of another paging group or when uplink / downlink traffic occurs, the terminal should terminate the idle mode and perform a new network registration procedure with the corresponding base station. In this case, since the UE must perform the same procedure as the initial network registration, it consumes a lot of power, and also has a problem in that it takes a lot of time to register the network.

In addition, if the idle mode UE moving to another paging group maintains the previous idle mode, the network mode transfers the idle mode request to the new base station again in the MAC management message, and the base station responds to the idle mode request. The message must be delivered to the terminal. Therefore, there is a problem of increased power consumption at the terminal according to the increase of the MAC signaling procedure.

Accordingly, the present invention provides an idle mode control system and method capable of efficiently performing idle mode management in a mobile communication system.

Method for controlling an idle mode that is a feature of the present invention for achieving the above technical problem,

Checking a first operation code included in a deregistration request message sent from the terminal; If the first operation code is a code for requesting entry into an idle mode, transmitting an idle mode list update request message including network re-entry retention information for the terminal and an ID of the terminal to a paging controller; Driving a timer for the idle mode list update request message and determining whether an idle mode list update response message has been received from the paging controller at the time of operation of the timer; And when the idle mode list update response message is received at the time of operation of the timer, cancels the timer and transmits a deregistration command message including a second operation code to inform the terminal of entry into idle mode. Processing the idle mode.

Method for controlling an idle mode which is another feature of the present invention for achieving the technical problem of the present invention,

Checking a control type included in the ranging request message when receiving a ranging request message requesting control from the terminal; If the control type is a location information update request, transmitting a location information request message including MAC address information and paging group ID information of the location terminal to the paging controller; Driving a timer for the location information request message and determining whether a location information response message is received from the paging controller at the time when the timer is operated; And receiving a location information response message at the time when the timer is operated, and canceling the timer and transmitting a ranging response message informing the terminal of acknowledging processing of location update.

Accordingly, even in the WiBro system of the mobile communication system, the idle mode control of the terminal can be performed, the location information of the terminal can be updated, and the network re-entry procedure of the terminal can be simplified, thereby reducing network re-entry time.

In addition, by managing the paging information and network re-entry retention information of the idle mode terminal, it is possible to minimize the communication control traffic for information sharing.

In addition, since the network re-entry process of the terminal can be performed by using a paging procedure, an incoming call setup service can be provided.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, without excluding other components unless specifically stated otherwise. In addition, the terms “… unit”, “… unit”, “module”, etc. described in the specification mean a unit that processes at least one function or operation, which may be implemented by hardware or software or a combination of hardware and software. have.

In this specification, a mobile station (MS) is a terminal, a mobile terminal (MT), a subscriber station (SS), a portable subscriber station (PSS), a user equipment (User Equipment). It may also refer to a user equipment (UE), an access terminal (AT), and the like, and may include all or some functions of a mobile terminal, a subscriber station, a portable subscriber station, a user device, and the like.

In the present specification, a base station (BS) is an access point (AP), a radio access station (Radio Access Station, RAS), a Node B (Node B), a base transceiver station (Base Transceiver Station, BTS), MMR ( Mobile Multihop Relay) -BS and the like, and may include all or part of functions such as an access point, a radio access station, a Node B, a base transceiver station, and an MMR-BS.

An idle mode control method according to an embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

1 is a structural diagram of a mobile communication system according to an embodiment of the present invention.

As shown in FIG. 1, a mobile communication system according to an exemplary embodiment of the present invention includes an access terminal (AT) 100, an access point (AP) 200, a packet access router (PAR), and a packet access router (PAR). ) 300 and paging control furnace 400. In addition, the mobile communication system includes a router 500 and an authentication / home agent and an address assignment server 600, which are general and will not be described in detail in the embodiments of the present invention.

First, the base station 200 is connected to the terminal 100 to support wireless connection and network connection of the user terminal 100. In addition, the terminal 100 performs access control, packet matching between a wired section and a wireless section, wireless transmission and reception control, and wireless band management. The base station 200 (200-n) is a Radio Frequency Subsystem (hereinafter referred to as 'RFS') (210, 210-n), Access Traffic Subsystem (hereinafter referred to as 'ATS') 220 , 220-n), an access controller subsystem (hereinafter referred to as an 'ACS') 230 and 230-n, and an Ethernet switch 240 and 240-n.

The RFSs 210 and 210-n perform data transmission and reception with the terminal 100 in a wireless section.

The ATSs 220 and 220-n perform traffic processing and packet scheduling, radio link control, radio resource management, packet matching between a wired section and a wireless section, HARQ control, and the like. In addition, in conjunction with the ACS (230, 230-n) and RFS (210, 210-n) performs traffic processing and radio link transmission and reception control functions.

The ATS 220 and 220-n receive the cell information and the user connection information from the ACS 230 and 230-n to perform traffic processing and scheduling functions, and deliver the scheduled downlink data combination to the radio frequency device for wireless communication. The uplink data combination requested or received is processed and transmitted to the PAR 300.

The ACS 230, 230-n controls protocol operations for controlling the base station 200 and the user terminal 100, and performs user management and cell management.

PAR 300 is connected to the base station 200 by IP-based wired to perform the mobility control and packet routing function of the user terminal 100 connected to the base station 200, and is connected to the Internet IP-based wired core network and Connect. And connected to the paging controller 400, authentication server, home agent (Home Agent, HA) and address assignment server 600 through the router 500, authentication, Dynamic Host Configuration Protocol (DHCP), Mobile IP (MIP) The handover between the base stations and the handover control function between the PAR 300 are performed.

The paging controller 400 includes an idle mode paging information storage unit 410, a network re-entry retention information storage unit 420, a paging broadcast control unit 430, and an information transmitter 440.

The idle mode paging information storage unit 410 manages paging information such as MAC address of the idle mode terminal, paging group ID, and network re-entry retention information of the idle mode terminal for controlling the idle mode of the terminal.

The network re-entry retention information storage unit 420 stores and manages the registration information for entering the idle mode of the terminal 100, registering a location update of the idle mode terminal, and reentering the network of the idle mode terminal.

The information transmitter 440 transmits the paging information stored in the idle mode paging information storage unit 410 and the retention information for network re-entry stored in the network re-entry retention information storage unit 420 to the base station 100.

The paging broadcast control unit 430 stores the information received from the base station 200 in the idle mode paging information storage unit 410 and the network re-entry retention information storage unit 420. In addition, paging broadcast at the end of the paging cycle, paging broadcast due to the generation of downlink traffic to the idle mode terminal, paging broadcast control by the VoIP call setup request to the idle mode terminal is performed.

Next, the idle mode control of the terminal in the mobile communication system described with reference to FIG. 1 will be described with reference to FIG. 2. As shown in FIG. 2, the idle mode control classification may be classified into four types, such as "enter idle mode entry", "location information update", "broadcast", and "network re-entry", but is not necessarily limited thereto. . In addition, although four classifications are illustrated as occurring sequentially in FIG. 2, they may not occur sequentially.

2 is a signal flowchart in an idle mode in a mobile communication system according to an embodiment of the present invention.

As shown in FIG. 2, the terminal 100 is already connected to the first base station 200 to receive a paging group ID of the first base station 200 as well (S101) and services through the first base station 200. To be provided. In this case, when the terminal 100 determines to switch to the idle mode, the terminal 100 transmits a DREG-REQ (Deregistration REQuest, hereinafter referred to as a "registration release request") message requesting entry into the idle mode. (S102).

Upon receiving the deregistration request message from the terminal 100, the first base station 200 transmits the message to the paging controller 400 in an IMECreq (Idle Mode Entry Change Request) message. (S103). Here, the idle mode list update request message includes the MAC address and network re-entry retention information of the first base station 200. The network reentry retention information includes idle mode maintenance information including bits indicating terminal maintenance information of subscriber station basic capability (SBC), privacy key management (PKM), registration (REG), and dynamic service addition (DSA), and the terminal is connected to the network. SBC encoding information, PKM encoding information, REG encoding information, and DSA encoding information necessary for reentry are included.

Upon receiving the idle mode list update request message, the paging controller 400 stores the paging information of the first base station 200 in an internal database, and stores the processing result in IMECresp (Idle Mode Entry Change Response). It is included in the message and delivered to the first base station 200 (S104). After receiving the idle mode list update response message, the first base station 200 according to a processing result includes a DREG-CMD (Deregistration Command) including an action code for confirming entry of the idle mode of the terminal 100. A message of " registration deregistration command " is transmitted to the terminal 100 (S105). Accordingly, the terminal 100 performs a mode conversion from the active mode to the idle mode.

After the terminal 100 in the idle mode checks the paging group ID in the DCD message or MOB_NBR-ADV (paging advertisement) message periodically broadcast from the base station (S106), if different from the paging group ID owned by Or, a condition such as an idle mode update timer expires may occur. In this case, when the paging group ID is different, the terminal 100 in idle mode moves from the first base station 200 to the second base station 200 ′, and the terminal 100 includes an RNG-REQ including a location update request. (Ranging Request, hereinafter referred to as "ranging request") transmits a message to the second base station 200 '(S107). The ranging request message includes location update request information, an ID of the terminal, and a paging ID.

Upon receiving the ranging request message from the terminal 100, the second base station 200 ′ may request a location update of the terminal to the paging controller 400 (Location Update Request, hereinafter referred to as “location information update request”). The message is transmitted (S108). The paging controller 400 receiving the location information update request message updates and stores the location information of the terminal 100 in a database, and stores a result of the processing as a LOUrsp (Location Update Response) message. In addition, it returns to the 2nd base station 200 '(S109). The second base station 200 ′ receiving the location information update response message transmits a RNG-RSP (Ranging Response) message to the terminal 100 to update the location of the terminal 100. Informs that the process has been performed (S110).

The above is a procedure for location update of the terminal 100 and the procedure for processing paging is as follows. First, when the second base station 200 ′ receives a paging announcement (PAGann) message for requesting paging processing from the paging controller 400 (S111), the second base station 200 ′ is received. ) Constructs a paging advertisement message and broadcasts it to a plurality of terminals in its area (S112). The paging advertisement message includes a MAC address hash value and operation code information of the terminal.

Upon receiving the paging advertisement message, the terminal 100 confirms its MAC address by checking a terminal MAC address hash value. If the operation code is a network entry request, the terminal 100 transmits a ranging request message to the second base station 200 'requesting network re-entry (S113) to initiate a network re-entry procedure. do.

Upon receiving the ranging request message of the network re-entry request, the second base station 200 ′ may request the idle mode paging information of the terminal 100 and the deletion of the idle mode information to the paging controller 400 by IMEXreq (Idle Mode Entry eXtraction Request, In the following description, it is transmitted in a manner of being referred to as "idle mode list extraction request" (S114). Receiving the idle mode list extraction request message, the paging controller 400 accesses the paging information of the terminal 100 from the database to the IMEXrsp (Idle Mode Entry eXtraction Response, hereinafter referred to as "idle mode list extraction response") message Return to the second base station 200 '(S115), and the idle mode information of the terminal 100 is deleted.

After receiving the idle mode list extraction response message, the second base station 200 ′ may transmit a ranging response message including idle mode maintenance information to the terminal 100 (S116) to perform a fast network re-entry procedure. Make sure Here, the terminal 100 performs a re-entry procedure to the network based on the idle mode maintenance information included in the ranging response message.

In FIG. 2, a procedure from entering idle mode to reentering a network in a mobile communication system has been described, and a procedure of processing a request of an idle mode terminal by a base station will be described with reference to FIG. 3.

3 is a flowchart illustrating a terminal idle mode request processing procedure when a base station is registered in a mobile communication system according to an exemplary embodiment of the present invention.

As shown in FIG. 3, when the base station receives a deregistration request message including an operation code from the terminal where the network registration procedure is completed (S201), the base station checks the operation code (S202). If the operation code is set to '0x01' indicating entry into the idle mode, the base station transmits an idle mode list update request message to the paging controller (S203).

Here, the idle mode list update request message includes SBC encoding, PKM encoding, REG encoding, and DSA encoding information configured based on network re-entry retention information of the terminal, MAC address information, and paging information of the terminal. The base station transmits an idle mode list update request message to the paging controller and drives an idle mode list update response timer waiting for a response to the idle mode registration request from the paging controller (S204).

However, a case where a network providing a service to a terminal cannot handle an idle mode of the terminal may occur. At this time, since the operation code is not set to '0x01' indicating entry into the idle mode, the base station transmits a deregistration command message indicating that it cannot process the idle mode of the terminal to the terminal (S205). The base station performs a general disconnection procedure with the terminal (S206).

When the base station receives an idle mode list update response message indicating the idle mode registration of the terminal from the paging controller (S207), it terminates the idle mode list update response timer in operation (S208) and releases resources such as CIDs assigned to the terminal. do. The operation code indicating the entry of the idle mode is included in the deregistration command message and transmitted to the terminal (S209), and the connection with the terminal is released (S210).

However, when the idle mode list update response timer driven in the state in which the base station does not receive the idle mode list update response message from the paging controller ends (S211), the base station notifies the terminal that the processing of the idle mode requested by the terminal has failed to register. The message is transmitted to the terminal (S212). Then, the release procedure is performed by the general method (S213).

Next, a procedure of controlling the idle mode of the terminal by the base station will be described with reference to FIG. 4.

4 is a procedure of the base station controls the idle mode of the terminal according to an embodiment of the present invention.

As shown in FIG. 4, when the base station receives the ranging request message from the idle mode terminal (S301), the base station determines the type requested by the terminal based on the terminal request information included in the ranging request message (S302). . The type required by the terminal can be divided into updating its own location information and reentry into the network. First, location information updating will be described.

When the terminal requests to update its own location information, the base station sends a location information update request message including the MAC address of the terminal and its paging group ID to request the paging controller to update the location of the idle mode terminal. It transmits (S303). In operation S304, the location information update response timer for waiting for a response from the paging controller is driven.

Thereafter, when the base station receives a location information update response message indicating a location update response from the paging controller (S309), the base station cancels the driving location information update response timer (S310). At the same time, a ranging response message informing the terminal of the location information update process is transmitted (S311). However, if the self-driven location information update response timer expires before the base station receives the location information update response message from the paging controller (S316), the base station generates a ranging response message informing the terminal that the location update process has failed. To transmit (S317).

Next, when the network reentry, which is another state requested by the terminal, is described, when the terminal requests ranging as a result of confirming the ranging request message in step S302, an initial entry lane generated in the process of entering the new network It is either a gong or a ranging that occurred during the reentry into the network. If the initial entry ranging, the base station allocates the basic CID and the primary CID to the terminal (S305), and includes the allocation information in the ranging response message and transmits to the terminal (S306).

On the other hand, when the terminal is re-entry to the base station, the base station transmits an idle mode list extraction request message including the MAC address and the paging group ID of the terminal to the paging controller (S307) to the paging controller terminal MAC network re-entry retention information Requires. At the same time, the base station drives an idle mode list extraction response timer that waits for a message informing the idle mode termination response from the paging controller (S308).

When the base station receives an idle mode list extraction response message indicating the response of the idle mode registration cancellation and the network re-entry retention information from the paging controller (S312), the driven idle mode list extraction response wait wait timer is canceled (S313). According to the network re-entry retention information of the received idle mode list extraction response message, idle mode maintenance information (SBC, PKM, REG, and DSA) is set for the terminal (S314) and a ranging response including idle mode maintenance information. A message is generated and transmitted to the terminal (S315). Upon receiving the ranging response message including the idle mode maintenance information, the terminal terminates the idle mode and performs a procedure for network re-entry.

On the contrary, if the idle mode list extraction response wait timer driven by the base station expires before receiving the idle mode list extraction response message from the paging controller (S316), the base station informs the terminal of the ranging response message indicating that the network re-entry processing failed. Generate and transmit to the terminal (S317).

In addition to the two types of processing described above, the base station also receives a paging announcement message informing the paging broadcast from the paging controller (S318). If the base station receives the paging announcement message, the base station configures a paging advertisement message, and then broadcasts the paging advertisement message to the terminal (S319).

The embodiments of the present invention described above are not implemented only through the apparatus and the method, but may be implemented through a program for realizing a function corresponding to the configuration of the embodiment of the present invention or a recording medium on which the program is recorded. Implementation may be easily implemented by those skilled in the art from the description of the above-described embodiments.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

1 is a structural diagram of a mobile communication system according to an embodiment of the present invention.

2 is a signal flowchart in an idle mode in a mobile communication system according to an embodiment of the present invention.

3 is a flowchart illustrating a terminal idle mode request processing procedure when a base station is registered in a mobile communication system according to an exemplary embodiment of the present invention.

4 is a procedure of the base station controls the idle mode of the terminal according to an embodiment of the present invention.

Claims (10)

In the mobile communication system processing idle mode of the terminal, Checking a first operation code included in a deregistration request message sent from the terminal; If the first operation code is a code for requesting entry into an idle mode, transmitting an idle mode list update request message including network re-entry retention information for the terminal and an ID of the terminal to a paging controller; Driving a timer for the idle mode list update request message and determining whether an idle mode list update response message has been received from the paging controller at the time of operation of the timer; And If the idle mode list update response message is received at the time of operation of the timer, the timer is canceled and a deactivation command message including a second operation code for informing the terminal to enter the idle mode is transmitted to idle the terminal. Steps to Process Mode Idle mode processing method comprising a. The method of claim 1, If the idle mode list update response message is not received at the time of operation of the timer, Transmitting a deregistration command message including information indicating that processing for an idle mode entry request requested by the terminal has failed; And Randomly releasing a connection with the terminal to set an idle mode for the terminal; Idle mode processing method further comprising. The method of claim 1, The network re-entry retention information, And idle mode maintenance information used as information when the terminal performs mode conversion from idle mode to active mode, and network reentry information which is information used when reentering the network. The method of claim 1, If the first operation code is not a code for requesting entry into idle mode, Transmitting a deregistration command message including information indicating that processing for an idle mode entry request requested by the terminal has failed; And Randomly releasing a connection with the terminal to set an idle mode for the terminal; Idle mode processing method further comprising. In the method for controlling the terminal in the idle mode in the mobile communication system, Checking a control type included in the ranging request message when receiving a ranging request message requesting control from the terminal; If the control type is a location information update request, transmitting a location information request message including MAC address information and paging group ID information of the location terminal to a paging controller; Driving a timer for the location information request message and determining whether a location information response message is received from the paging controller at the time when the timer is operated; And Receiving a location information response message at the time when the timer is operated, canceling the timer and transmitting a ranging response message informing the terminal of acknowledgment of the location update processing; Control method of the idle mode terminal comprising a. The method of claim 5, If the location information response message is not received at the time of operation of the timer, Transmitting a ranging response message to the terminal, the ranging response message including information indicating that the processing of the request for updating the location information requested by the terminal has failed. Idle mode processing method further comprising. The method of claim 5, If the control type is the initial ranging request, Determining whether the terminal is reentry into a network; Requesting network re-entry retention information by transmitting an idle mode list extraction request message including a MAC address of the terminal and a paging group ID to the paging controller when the terminal is reentering the network; Driving an idle mode list extraction response timer for the idle mode list extraction request message, and determining whether an idle mode list extraction response message is received from the paging controller at the time when the timer is operated; And Canceling the timer and transmitting a ranging response message including idle mode maintenance information to the terminal when the idle mode list extraction response message is received at the time when the timer is operated; Control method of the idle mode terminal further comprising. The method of claim 7, wherein If the idle mode list extraction response message is not received at the time of operation of the timer, Transmitting a ranging response message to the terminal, the ranging response message including information indicating that the network re-entry request requested by the terminal has failed. Control method of the idle mode terminal further comprising. The method of claim 7, wherein If the terminal is the initial entry into the network, Allocating a basic CID and a primary CID to the terminal; And Transmitting a ranging response message including the allocated information to the terminal; Control method of the idle mode terminal further comprising. The method of claim 5, Receiving a paging announcement message for paging broadcast from the paging controller; And Broadcasting a paging advertisement message including a MAC address hash value and an operation code for requesting paging to the terminal; Control method of the idle mode terminal further comprising.

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