WO2011084008A2

WO2011084008A2 - Method for performing deregistration with content retention mode in broadband wireless access system

Info

Publication number: WO2011084008A2
Application number: PCT/KR2011/000118
Authority: WO
Inventors: 박기원; 김용호; 류기선
Original assignee: 엘지전자 주식회사
Priority date: 2010-01-07
Filing date: 2011-01-07
Publication date: 2011-07-14
Also published as: WO2011084008A3

Abstract

The present invention relates to a broadband wireless access system, and more specifically, to a deregistration with content retention mode operation procedure initiated by a base station. According to one embodiment of the present invention, the present invention provides a method for, a mobile station, performing a deregistration with content retention (DCR) mode by a request of a base station in a broadband wireless access system, and the method comprises the steps of: receiving a first broadcast message for indicating entry into the DCR mode from the base station; transmitting a second message for requesting the entry into the DCR mode to the base station; receiving a third broadcast message that includes acknowledgement (ACK) information for indicating whether the second message is detected; and entering the DCR mode if the ACK information indicates a successful detection of the second message.

Description

How to Perform Content Retention Unregister Mode in a Broadband Wireless Access System

The present invention relates to a broadband wireless access system, and more particularly, to a content preserving deregistration mode operating procedure initiated by a base station and a content preserving deregistration mode operating procedure of a terminal according to a message indicating a self-configuration state of a base station.

Hereinafter, an idle mode and a paging group of a terminal related to embodiments of the present invention will be briefly described.

In idle mode, when a user equipment moves in a radio link environment composed of multiple base stations, the terminal may periodically perform downlink (DL) broadcast traffic transmission without registering with a specific base station. Say.

When the terminal does not receive traffic from the base station for a certain time, it may transition to the idle mode in order to save power. The terminal transitioning to the idle mode may receive a broadcast message (for example, a paging message) transmitted by the base station for an available interval to determine whether to transition to the normal mode or remain in the idle mode. have. In addition, the terminal in the idle mode may inform the paging controller of its location by performing the location update.

Idle mode can benefit the terminal by eliminating the activation requirements and general operational requirements associated with the handover. The idle mode may limit the terminal activity to be scanned in discrete periods, thereby saving power and operating resources used by the terminal.

In addition, the idle mode provides a simple and appropriate way to inform the terminal of pending downlink traffic, and removes the air interface and network handover (HO) traffic from the inactive terminal. And base stations.

Paging refers to a function of identifying a location (eg, any base station or a switching station) of a mobile station (MS) when an incoming call occurs in mobile communication. A plurality of base stations (BSs) supporting the idle mode may belong to a specific paging group to configure a paging area.

At this time, the paging group represents a logical group. The purpose of a paging group is to provide a contiguous area that can be paged downlink (DL) if there is traffic targeted to the mobile station (MS). The paging group is preferably large enough to allow a particular terminal to exist for most of the time in the same paging group, and satisfies the condition that the paging load should be small enough to maintain an appropriate level.

However, in a general IEEE802.16 based wireless communication system, the terminal has to enter the idle mode even when the paging procedure is unnecessary in order to save power. Accordingly, paging-related information is unnecessarily allocated. In this case, the terminal needs to wake up according to the paging segment even if it does not need to receive the paging message in the idle mode.

Accordingly, the base station triggers a context retention timer and stores the context information of the terminal to facilitate re-entry of the terminal to facilitate content reregistration (DCR). Content Retention) mode is defined.

The DCR mode may be initiated through a message for requesting the UE to enter the DCR mode, that is, a deregistration request (DREG-REQ) message. However, when it is necessary to deregister the terminal due to the circumstances of the base station (for example, resetting or restarting the base station), when the base station instructs the terminal to enter the DCR mode, the network re-entry procedure of the deregistered terminal is efficient. It can be performed as.

However, in the current IEEE 802.16m system, the method for initiating the DCR mode by the base station is not defined, and therefore, an efficient procedure for this needs to be defined.

Next, a self-organizing and optimizing network (AAI_SON-ADV) message will be described.

The self network configuration and optimization announcement message is used to broadcast SON related information from a base station (ABS) connected to a core access network supporting self network configuration and optimization (SON).

Action type fields are defined in the AAI_SON-ADV message as shown in Table 1 below.

Table 1

Referring to Table 1, the operation type field may indicate reconfiguration, restart, scanning, reliability, and low duty mode (LDM) parameter change of a base station. .

According to the operation type, the AAI_SON-ADV message may be accompanied by additional fields, through which the base station may include a time point, interval, and / or a new frequency band (FA) in which normal service is not available to the terminal.

However, in the current IEEE 802.16m system, when the base station broadcasts an AAI_SON-ADV message, a specific operation procedure of the terminal receiving the AAI_SON-ADV message is not defined, for example, whether or not to start the DCR mode, so an efficient procedure for this needs to be defined. have.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of general technology, and an object of the present invention is to provide an efficient procedure for initiating a content preservation deregistration (DCR) mode by a base station and an apparatus for performing the same. .

Another object of the present invention is to provide an efficient procedure for receiving a self network configuration and optimization announcement message of a base station and to enter a content preservation deregistration (DCR) mode accordingly, and an apparatus for performing the same.

The technical problems to be achieved in the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned above will be clearly understood by those skilled in the art from the following description. Could be.

In a broadband wireless access system according to an embodiment of the present invention to solve the problems of the above-described general technique, a method for a UE to perform a content preservation deregistration (DCR) mode according to a request of a base station includes: the DCR mode from a base station; Receiving a first broadcast message instructing entry into the network; Transmitting a second message requesting entry of the DCR mode to the base station; Receiving a third broadcast message including acknowledgment (ACK) information indicating whether the second message is detected; And when the ACK information indicates successful detection of the second message, entering the DCR mode.

In this case, the first broadcast message includes an identifier for identifying the terminal in the DCR mode and transmission opportunity offset information indicating an uplink resource for transmitting the second message, and the ACK information includes a bitmap. It is preferable that the second message is transmitted through an uplink resource indicated by the transmission opportunity offset information.

Retransmitting the second message to the base station when a bit for the terminal in the bitmap indicates a detection failure of the second message; Alternatively, the method may further include performing a handover to another base station.

The first broadcast message is a DCR announcement (AAI_DCR-ADV) message in which an action code field is set to a value indicating entry into the DCR mode, and the third broadcast message includes: Preferably, the DCR announcement message is set to a value indicating a response to the second message.

In addition, when the first broadcast message is transmitted with a control header header (MCEH) indicating the transmission of the second message, the second message is a message acknowledgment (AAI_MSG-ACK) message or a band request code (BR preamble sequence). If the first broadcast message does not accompany the control header, the second message is a deregistration request message with a deregistration request code set to 0x04. desirable.

In the broadband wireless access system according to an embodiment of the present invention to solve the problems of the general technology as described above, the base station performs a content preservation deregistration (DCR) mode for at least one terminal by request. Broadcasting a first broadcast message indicating entry into the DCR mode; Receiving a second message requesting entry of the DCR mode from the at least one terminal; And broadcasting a third broadcast message including acknowledgment (ACK) information indicating whether the at least one second message is detected, respectively.

In this case, the first broadcast message includes an identifier for identifying each of the at least one terminal in the DCR mode, and transmission opportunity offset information for indicating uplink resources for transmitting the second message to each of the at least one terminal. Preferably, the ACK information is configured in a bitmap form, and the second message is received through an uplink resource indicated by the transmission opportunity offset information.

The first broadcast message is a DCR announcement (AAI_DCR-ADV) message having an action code field set to a value indicating entry into the DCR mode, and the third broadcast message includes the action code field. Preferably, the DCR announcement message is set to a value indicating a response to the second message.

In addition, the second message may be a deregistration request (AAI_DREG-REQ) message in which a deregistration request code is set to 0x04.

In addition, when the first broadcast message is transmitted with a control header header (MCEH) indicating the transmission of the second message, the second message is a message acknowledgment (AAI_MSG-ACK) message or a band request code (BR preamble sequence). It may also be a Quick Access Message transmitted with).

In order to solve the above problems of the general technology, a terminal device performing content preservation deregistration (DCR mode) in a broadband wireless access system according to another embodiment of the present invention includes a processor; And a radio communication (RF) module for transmitting and receiving a radio signal to and from the outside under the control of the processor, wherein the processor receives a first broadcast message instructing entry into the DCR mode from a base station to the base station. The third broadcast message is transmitted from the base station to transmit a second message requesting entry into the DCR mode, and includes acknowledgment (ACK) information indicating whether the second message is detected. When instructing the successful detection of the message, it may be controlled to enter the DCR mode.

In addition, when a bit for the terminal in the bitmap indicates the detection failure of the second message, the controller may control to retransmit the second message to the base station or to perform a handover to another base station. .

In addition, when the first broadcast message is transmitted with a control header header (MCEH) indicating the transmission of the second message, the second message is a message acknowledgment (AAI_MSG-ACK) message or a band request code (BR preamble sequence). ) Is a quick access message transmitted with a message), and if the first broadcast message does not accompany the control header, the second message is a deregistration request message with a deregistration request code set to 0x04. Do.

In addition, in order to solve the above problems of the general technology, a method of performing a content preservation deregistration (DCR) mode by a terminal in response to a request of a base station in a broadband wireless access system according to an embodiment of the present invention includes: Unsolicited receiving a first message instructing entry into the DCR mode, the first message including start time information of a first time and interval information of the first time; Transmitting a second message requesting entry of the DCR mode to the base station before the time indicated by the start time information; And when the third message is received in response to the second message from the base station, entering the DCR mode.

In this case, when the first time expires, the DCR mode performing method includes a ranging purpose indication field set to an identifier for identifying the terminal in the DCR mode and a value indicating network re-entry in the DCR mode. Sending a request (AAI_RNG-REQ) message to the base station; And receiving a ranging response (AAI_RNG-RSP) message from the base station, the ranging response including optimization information indicating a procedure that may be omitted from the network re-entry.

The first message may be an AAI_SON-ADV message, and the second message may be an AAI_DREG-REQ message in which a deregistration request code is set to 0x04.

In addition, the first message is a deregistration response (AAI_DREG-RSP) message including an operation code field set to a first value instructing the terminal to transition to the DCR mode by request, and the second message is the It may be an AAI_DREG-REQ message including a deregistration request code set to a second value requesting entry into the DCR mode in response to a first value.

In addition, the start time information is a no start time (UTI) field, the interval information is a no time interval (UTI) field, the identifier is a context preservation identifier (CRID), and the third The message is preferably an unregistered response (AAI_DREG-RSP) message or a message acknowledgment (AAI_MSG-ACK) message.

In a method for performing a content preservation deregistration (DCR) mode for at least one terminal by a base station in a broadband wireless access system according to an embodiment of the present invention in order to solve the above problems of the general technology, Instructing to enter the DCR mode, and transmits a first message to the at least one terminal as a non-request, the first message including start time information of the first time and Interval information of the first time step; Receiving a second message requesting entry of the DCR mode from the at least one terminal before the time indicated by the start time information; And transmitting a third message to the at least one terminal in response to the second message.

In this case, after the first time expires, a ranging request including a ranging purpose indication field set to an identifier for identifying a terminal in the DCR mode and a value indicating network re-entry in the DCR mode (AAI_RNG-REQ) Receiving a message from any one of the at least one terminal; And transmitting a ranging response (AAI_RNG-RSP) message including optimization information indicating a procedure that may be omitted from the network reentry, to any one of the terminals.

In order to solve the above problems of the general technology, a terminal device performing content preservation deregistration (DCR mode) in a broadband wireless access system according to another embodiment of the present invention includes a processor; And a radio communication (RF) module for transmitting and receiving a radio signal to and from the outside under the control of the processor, wherein the processor instructs an entry into the DCR mode from a base station, and a start time of a first time. A second message requesting entry into the DCR mode to the base station before a time point indicated by the start time information when the first message including information and the interval information of the first time is unsolicited. When the message is transmitted and a third message is received in response to the second message from the base station, it may be controlled to enter the DCR mode.

In this case, when the first time expires, the processor includes a ranging request (AAI_RNG) including an identifier for identifying the terminal in the DCR mode and a ranging purpose indication field set to a value indicating network re-entry in the DCR mode. -REQ) may be transmitted to the base station and control to receive a ranging response (AAI_RNG-RSP) message from the base station including optimization information indicating a procedure that may be omitted from the network re-entry.

According to embodiments of the present invention has the following effects.

First, by using the embodiments of the present invention, the terminal can efficiently enter the DCR mode according to the start of the base station.

Second, since information for fast network reentry of the terminal is stored by the network entity, the terminal can efficiently perform network reentry.

Third, by using the embodiments of the present invention, the terminal can efficiently enter the DCR mode according to the self network configuration and optimization announcement message of the base station.

Fourth, since information for fast network reentry of the terminal is stored by the network entity, the terminal can efficiently perform network reentry.

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

1 shows an example of a DCR mode entry procedure of a terminal according to the present invention.

2 illustrates an example of a method for performing an unsolicited DCR mode of a base station according to an aspect of an embodiment of the present invention.

3 illustrates an example of a method for performing an unsolicited DCR mode of a base station according to another aspect of an embodiment of the present invention.

4 illustrates an example of a method for performing an unsolicited DCR mode of a base station according to another aspect of an embodiment of the present invention.

5 shows an example of a method for performing an unsolicited DCR mode of a base station according to another aspect of an embodiment of the present invention.

6 shows an example of a DCR mode entry and network re-entry procedure of a terminal according to another aspect of the present invention.

7 shows another example of a DCR mode entry and network re-entry procedure of a terminal according to another aspect of another embodiment of the present invention.

8 illustrates an example of a DCR mode entry and network re-entry procedure of a terminal according to another aspect of another embodiment of the present invention.

9 illustrates an example of a DCR mode entry and network re-entry procedure of a terminal according to another aspect of another embodiment of the present invention.

10 shows an example of a network initial entry procedure of a terminal according to another aspect of another embodiment of the present invention.

11 is a block diagram illustrating an example of a structure of a transmitting end and a receiving end according to another embodiment of the present invention.

The present invention relates to a wireless access system. Hereinafter, embodiments of the present invention disclose methods for efficiently starting a DCR mode by a base station and methods for efficiently entering a terminal into a DCR mode according to a broadcast message of a base station.

The following embodiments combine the components and features of the present invention in a predetermined form. Each component or feature may be considered to be optional unless otherwise stated. Each component or feature may be embodied in a form that is not combined with other components or features. In addition, some components 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 components or features of one embodiment may be included in another embodiment or may be replaced with corresponding components or features of another embodiment.

In the description of the drawings, procedures or steps which may obscure the gist of the present invention are not described, and procedures or steps that can be understood by those skilled in the art are not described.

In the present specification, embodiments of the present invention have been described based on data transmission / reception relations between a base station and a terminal. Here, the base station has a meaning as a terminal node of a network that directly communicates with the terminal. The specific operation described as performed by the base station in this document may be performed by an upper node of the base station in some cases.

That is, various operations performed for communication with a terminal in a network consisting of a plurality of network nodes including a base station may be performed by the base station or other network nodes other than the base station. In this case, the 'base station' may be replaced by terms such as a fixed station, a Node B, an eNode B (eNB), an access point, and an ABS (Advanced Base Station). In addition, the term 'mobile station' may be replaced with terms such as user equipment (UE), subscriber station (SS), mobile subscriber station (MSS), advanced mobile station (AMS), or mobile terminal (Mobile Terminal). Can be.

In addition, the transmitting end refers to a node transmitting data or voice service, and the receiving end refers to a node receiving data or voice service. Therefore, in uplink, a terminal may be a transmitting end and a base station may be a receiving end. Similarly, in downlink, a terminal may be a receiving end and a base station may be a transmitting end.

On the other hand, the mobile terminal of the present invention PDA (Personal Digital Assistant), cellular phone, PCS (Personal Communication Service) phone, GSM (Global System for Mobile) phone, WCDMA (Wideband CDMA) phone, MBS (Mobile Broadband System) phone And the like can be used.

Embodiments of the invention may be implemented through various means. For example, embodiments of the present invention may be implemented by hardware, firmware, software, or a combination thereof.

In the case of a hardware implementation, the method according to embodiments 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 (FPGAs), processors, controllers, microcontrollers, microprocessors, and the like.

In the case of an implementation by firmware or software, the method according to the embodiments of the present invention may be implemented in the form of a module, procedure, or function that performs the functions or operations described above. The software code may be stored in a memory unit and driven by a processor. The memory unit may be located inside or outside the processor, and may exchange data with the processor by various known means.

Embodiments of the present invention may be supported by standard documents disclosed in at least one of the wireless access systems IEEE 802 system, 3GPP system, 3GPP LTE system and 3GPP2 system. That is, steps or parts which are not described to clearly reveal the technical spirit of the present invention among the embodiments of the present invention may be supported by the above documents. In addition, all terms disclosed in the present document can be described by the above standard document. In particular, embodiments of the present invention may be supported by one or more of the standard documents P802.16-2004, P802.16e-2005, P802.16Rev2, and P802.16m documents of the IEEE 802.16 system.

Specific terms used in the following description are provided to help the understanding of the present invention, and the use of such specific terms may be changed to other forms without departing from the technical spirit of the present invention.

This specification assumes an IEEE 802.16 system. In particular, it is assumed that the terminal appearing below is an AMS (Advanced Mobile Station) that satisfies the standard defined by the IEEE802.16m standard.

Hereinafter, the content retention deregistration mode (DCR mode) proposed in the present invention will be described.

The DCR mode refers to a mode in which a terminal is deregistered from the network, but the context of the terminal is preserved by a network entity until the context retention timer expires. Then, when the terminal attempts to reenter the network before the timer expires, the base station may request and receive the context of the terminal as a network entity, thereby efficiently performing the network reentry procedure of the terminal.

In the DCR mode, a context retention identifier (CRID: Context Retention Identifier) is used to uniquely identify the terminal. This CRID is changed when the network enters the area or the area where the terminal AMS supports legacy terminals (YMS, IEEE802.16e standard terminals) in the IEEE 802.16m system to the area MZone that supports AMS. It may be included in the registration response (AAI_REG-RSP) message received from the base station when performing. The CRID is updated through a ranging response (AAI_RNG-RSP) message when the UE performs network reentry (when performing handover, returning from DCR mode, or performing network reentry in a coverage loss state). It may be.

The above-described DCR mode entry procedure will be described with reference to FIG. 1.

Referring to FIG. 1, the terminal may enter a DCR mode while performing data exchange normally in a state of being connected to a serving base station (S101).

To this end, the UE may initiate the DCR mode by setting a specific parameter value in the AAI_DREG-REQ message to the serving base station (S102).

In this case, the specific parameter is preferably a deregistration_Request_Code field, and its value may be set to 0x04, which is a value for requesting entry into the DCR mode. The configuration of the deregistration request code field is shown in Table 2 below.

Table 2 shows an example of some form of deregistration request message that can be applied to embodiments of the present invention.

TABLE 2

In this case, the terminal may request to preserve specific service and operation information for the purpose of DCR mode management. As a method, a method of including a specific service or operation information requesting preservation in the form of an idle mode retain information element may be used.

When the serving base station accepts the DCR mode entry request of the terminal, the serving base station may transfer information requested by the terminal to a network entity (S103).

In addition, an action code may be set in a deregistration response message (AAI_DREG-RSP) to a value (for example, 0x08) indicating a DCR mode entry allowance of the terminal (for example, 0x08) and transmitted to the terminal (S104). .

Upon receiving the deregistration response message from the serving base station, the terminal may start the context preservation timer and operate in the DCR mode (S105).

In the above-described procedure, steps S103 and S104 may be reversed. When the base station rejects the DCR entry request of the terminal, the operation code of the deregistration response message may indicate a value indicating a denial of entry into the DCR mode of the terminal. For example, 0x09 may be set and transmitted to the terminal.

While the terminal is operating in the DCR mode, the terminal and the base station basically do not perform any data exchange including a paging procedure except when the terminal requests network reentry in the DCR mode or an extension of the resource retention time. No.

제 1 실시예: 기지국이 비요청으로 개시하는 DCR 모드 동작 절차First Embodiment: Operation Procedure of DCR Mode Initiated by Unsolicited Base Station

If it is necessary to deregister the terminal due to the circumstances of the base station (for example, resetting or restarting the base station), if the base station instructs the terminal to enter the DCR mode by request, the network re-entry procedure of the deregistered terminal is performed. It can be performed efficiently. Hereinafter, a DCR mode operation procedure of an unsolicited manner based DCR mode initiation by a base station according to the present invention will be described.

제 1 양상1st aspect

In an aspect of an embodiment of the present invention, a new MAC management message is defined to instruct a base station to enter a DCR mode to a terminal registered with the base station, and a DCR mode is initiated by the base station using the same. Suggest a method.

This procedure is described with reference to FIG.

Referring to FIG. 2, the base station may request the UEs to transition to the DCR mode in a situation such as reconfiguration, restart, backhaul link down, and the like.

First, the base station transmits a MAC message (hereinafter referred to as a content preservation deregistration announcement (AAI_DCR-ADV) message for convenience) to the terminals for requesting the DCR mode transition proposed in the present invention in an unsolicited manner. (S201).

Table 3 below shows an example of the AAI_DCR-ADV message format according to the present embodiment.

TABLE 3

As shown in Table 3, the AAI_DCR-ADV message proposed in the present invention includes an action code field, a field indicating the number of target terminals, and an action code field that can be set as a value for indicating the UE to enter the unsolicited DCR mode. It may include a CRID for each terminal, a transmission opportunity offset for notifying uplink resources for performing a DCR mode request in symbol interval units. In addition, when the operation code field is set to a value indicating a response to the DCR mode entry request of the terminal and the DR-ACK bitmap field indicating whether the base station detects (detect) for the DCR mode request of the terminal as a bitmap; It may include an Idle Mode Retaon Information field indicating the context information of the terminal to be stored. As described above, the CRID may be pre-assigned in the registration process or the network re-entry procedure of the terminal. If the CRID has the same value as the pre-assigned CRID (that is, the base station does not change the CRID for the terminal), the CRID field is used. May be omitted.

In step S201, the base station sets an action code (action code) to 0b00 (signal to enter the DCR mode to the terminal by request) and transmits to the terminal including the CRID and the transmission opportunity offset (transmission opportunity offset). Upon receiving the AAI_DCR-ADV message from the base station, the UE checks the action code and its CRID and enters the deregistration request code of the AAI_DREG-REQ message into the DCR mode at the time indicated by the transmission opportunity offset field. Set to the request value (that is, 0x04) and transmit (S202).

The base station receiving AAI_DREG-REQ (De-registration_request_code 0x04) from the terminal transmits an AAI_DCR-ADV message to the terminals in response (S203).

At this time, the operation code field is set to 0b01 in the AAI_DCR-ADV message and is transmitted with a DR (DCR mode Request) -ACK bitmap. When the UE receives the corresponding message and checks the DR-ACK bitmap and is set to 0b00, AAI_DREG-REQ (DeAI) for requesting to enter the DCR mode until the retry count (retry_count) of the preset value expires. -registration_request_code 0x04) You can resend the message. In addition, when checking the DR-ACK bitmap and is set to 0b01, the terminal transitions to the DCR mode.

제 2 양상2nd aspect

In another aspect of an embodiment of the present invention, a DCR mode initiated by a base station using a newly defined medium access management (MAC management) message and a control extension header to instruct the base station to enter a DCR mode to a terminal registered with the base station. Suggest ways to do it. That is, the present embodiment proposes that the terminal transmits a message acknowledgment message to the base station instead of the deregistration request message to request the base station to enter the DCR mode. This procedure is described with reference to FIG. 3.

Referring to FIG. 3, the base station may request the UEs to transition to the DCR mode in a situation such as reconfiguration, restart, backhaul link down, and the like.

First, the base station transmits an AAI_DCR-ADV message to the terminals in an unsolicited manner (S301).

At this time, the base station, along with the AAI_DCR-ADV message, information for instructing to return a message acknowledgment (AAI_MSG-ACK) message or not, for example, MAC control for setting a polling bit (polling bit) The extended header (MCEH) is transmitted to the terminal.

Table 4 below shows an example of the AAI_DCR-ADV message format according to the present embodiment.

Table 4

As shown in Table 4, the AAI_DCR-ADV message proposed in this embodiment is similar in form to the AAI_DCR-ADV message in Table 1 described above. However, the DR-ACK bitmap field has been changed to indicate whether the AAI_MSG-ACK message is detected instead of the AAI_DREG-REQ message. Since the remaining fields are similar to those in Table 2, redundant descriptions will be omitted.

In step S301, the base station sets an action code (action code) of the AAI_DCR-ADV message to 0b00 (signal entry into the DCR mode to the terminal as unsolicited) and includes a CRID and a transmission opportunity offset to the terminal. send. Upon receiving the AAI_DCR-ADV message from the base station, the UE checks the action code, its CRID and the MCEH, and transmits a message acknowledgment (AAI_MSG-ACK) message to the base station at the time indicated by the transmission opportunity offset field (S302).

Upon receiving the AAI_MSG-ACK message from the terminal, the base station transmits an AAI_DCR-ADV message in which an operation code field is set to 0b01 to the terminals (S303).

At this time, the AAI_DCR-ADV message includes a DR mode request (DR) -ACK bitmap. When the UE receives the corresponding message, checks the DR-ACK bitmap, and sets 0b01, the UE transitions to the DCR mode. In addition, the UE confirming that the DR (DCR mode Request) -ACK bitmap value is set to 0b00 may transmit a AAI_DREG-REQ message with the deregistration request code set to 0x04 to request the BS to newly transition to the DCR mode. .

제 3 양상3rd aspect

In another aspect of the embodiment of the present invention, after the base station instructs the terminal registered in the UE to enter the DCR mode, the terminal performs handover to another base station according to whether the terminal detects a message for entering the DCR mode. We propose a method of performing DCR mode.

The method of performing the DCR mode according to the present embodiment is similar to the process of transmitting a response to the DCR mode entry request of the UE through the AAI_DCR-ADV message, compared to the embodiment and the other embodiment of the present invention, but in the AAI_DCR-ADC message. The operation of each terminal is different according to the value of the included DR-ACK bitmap. That is, when the bit for the corresponding UE in the DR-ACK bitmap indicates that the UE has successfully detected the DCR mode entry request, the UE enters the DCR mode and indicates that the DCR mode entry request is not detected. Instead of retrying the DCR mode entry request, the UE may perform handover to another base station. This will be described with reference to FIG. 4.

Steps S401 to S403 of FIG. 4 are similar to steps S301 to S303 of FIG. 3, and thus descriptions thereof will be omitted for simplicity of the specification.

The UE receives the AAI-DCR-ADV message, checks the DR-ACK bitmap, and if it is set to 0b01, the UE transitions to the DCR mode (S404).

On the contrary, when the value of the DR mode-ACK bitmap is set to 0b00, the UE may perform handover to the neighboring preferred base station (S405).

In the above-described DCR mode operation procedure, steps S401 to S403 may be replaced with steps S201 to S203 of FIG. 2. In this case, in step S403, the DR-ACK bitmap is not a response to the AAI_MSG-ACK message but a response to the AAI_DREG-ACK message.

제 4 양상4th aspect

In another aspect of the embodiment of the present invention, the base station uses the newly defined medium management message and the control extension header to instruct the terminal to register in the DCR mode. The present invention proposes a method of instructing a mode entry and performing a response to the terminal through a partial process of the band request BR. That is, the present embodiment proposes to transmit a bandwidth request code (BR preamble sequence) and a quick access message to the base station instead of the deregistration request message to request the base station to enter the DCR mode. This procedure is described with reference to FIG. 5.

Referring to FIG. 5, the base station may request the UEs to transition to the DCR mode in situations such as reconfiguration, restart, backhaul link down, and the like.

First, the base station transmits an AAI_DCR-ADV message to the terminals in an unsolicited manner (S501).

At this time, the base station transmits information for indicating to return a response to the message along with the AAI_DCR-ADV message, for example, a MAC control extension header (MCEH) that sets a polling bit to the terminal.

In step S501, the base station sets an action code (action code) of the AAI_DCR-ADV message to 0b00 (signal entry into the DCR mode to the terminal as unsolicited) and includes a CRID and a transmission opportunity offset to the terminal. send. Upon receiving the AAI_DCR-ADV message from the base station, the UE checks the action code and its CRID and MCEH, and at the time indicated by the transmission opportunity offset field, the terminal requests the base station code (BR preamble sequence) and quick access message (quick access message). ) Is transmitted (S502).

Upon receiving the bandwidth request code and the fast access message from the terminal, the base station transmits an AAI_DCR-ADV message in which an operation code field is set to 0b01 to the terminals (S503).

At this time, the AAI_DCR-ADV message includes a DR mode request (DR) -ACK bitmap. When the UE receives the corresponding message, checks the DR-ACK bitmap, and sets 0b01, the UE transitions to the DCR mode. In addition, the UE confirming that the DR (DCR mode Request) -ACK bitmap value is set to 0b00 transmits an AAI_DREG-REQ message with the deregistration request code set to 0x04, and requests a new transition to the DCR mode to the base station. Handover to another base station may be performed.

In the above-described embodiment of the present invention, if the UE intends to extend the DCR mode, that is, to extend the context preservation timer, the ranging purpose indication is indicated in the ranging request message (AAI_RNG-REQ) before the timer expires. Indication) field may be set to 0b0100 and the CRID may be transmitted to the base station.

In addition, when the UE intends to perform network reentry in the DCR mode, the ranging request message (AAI_RNG-REQ) sets the ranging purpose indication field to 0b1000 and includes the CRID before the context preservation timer expires. Can be sent. The subsequent network reentry procedure is similar to the network reentry procedure from idle mode in a general IEEE 802.16m system, and thus a detailed description thereof will be omitted.

기지국의 SON 관련 절차에 따른 DCR 모드 동작 절차DCR mode operation procedure according to SON procedure of base station

When the self network configuration and optimization (SON) operation of the base station (eg, base station reset or restart, etc.) is performed, the base station broadcasts information related thereto through an AAI_SON-ADV message. In this case, when the UEs served from the base station enter the DCR mode, the network re-entry procedure of the deregistered terminal may be efficiently performed after the SON-related procedure of the base station is terminated.

Hereinafter, methods of initiating a DCR mode operation procedure according to an AAI_SON-ADV message according to a SON related procedure of a base station according to another embodiment of the present invention will be described.

제 1 양상1st aspect

In an aspect of another embodiment of the present invention, a method for entering a DCR mode by a terminal when a BS instructs to perform a reset through an AAI_SON-ADV message is provided. This will be described with reference to FIG. 6.

Referring to FIG. 6, when the SON-related operation of the base station is resetting the base station, the base station sets an action type field of the AAI_SON-ADV message to a value indicating ABS reconfiguration (eg 0b000) and disables the start time ( The UST includes an Unavailability start time and a Unavailable time interval of the ABS (UTI), and transmits the same to the UE (S601).

In this case, the UST may indicate, in frame units, a time point at which an unavailable time, which is a time at which the base station does not provide a normal service to terminals for performing a corresponding SON operation, starts. In addition, the UTI may indicate an interval of a non-available time in a superframe unit.

Upon receiving the AAI_SON-ADV message, the UE sets a deregistration request code to a value (ie, 0x04) requesting to enter the DCR mode before the time indicated by the UST field (AAI_DREG-REQ). The message is transmitted to the base station (S602).

When the base station accepts the request to enter the DCR mode of the UE, the action code is 0x08 (This option is valid only in response to an AAI_DREG-REQ message with De-Registration Request Code 0x04 to allow retention of the AMS's connection information) The deregistration response (AAI_DREG-RSP) message is set to the terminal, and the terminal receiving the entry enters the DCR mode (S603).

When the interval indicated by the UTI field has elapsed from the time point indicated by the UST field (Expire Unavailable time interval of ABS), since the ABS reconfiguration procedure of the base station has been completed, the terminal may indicate a ranging purpose indication field. A ranging request (AAI_RNG-REQ) message including a CRID is set to a value indicating network re-entry in the DCR mode and is transmitted to the base station (S604).

After receiving the ranging response (AAI_RNG-RSP) message from the base station, the terminal may operate in the normal mode (S605).

At this time, the ranging response message may include a reentry process optimization parameter (Reentry Process Optimization) may be instructed to the terminal that can be omitted according to the preserved context of the terminal. Therefore, the network reentry procedure of the terminal can be performed more efficiently.

제 2 양상2nd aspect

Meanwhile, in another aspect of the present embodiment, a terminal also provides a method of entering a DCR mode when receiving an AAI_SON-ADV message in an idle mode.

In the DCR entry method according to this aspect, a method for requesting the UE to switch from the idle mode to the DCR mode needs to be defined. To this end, the present embodiment proposes to perform the switching from the idle mode to the DCR mode in the form of location update through a ranging request message in which the ranging purpose indication field is set to a specific value.

An example of the ranging purpose indication field according to this aspect will be described with reference to Tables 5 and 6 below.

Table 5

First, Table 5 shows a configuration when the ranging purpose indication field has a form in which bits are allocated for each purpose. That is, when a specific bit of the ranging purpose indication field is set to 1, it may indicate that the terminal performs location update for the transition from the idle mode to the DCR mode.

Table 6

In addition, when the ranging purpose indication field is composed of a plurality of bits (for example, 4 bits), as shown in Table 6, when it is set to 0b0111, it indicates that the UE performs a location update for the transition from the idle mode to the DCR mode. can do.

Hereinafter, a procedure in which the UE transitions from the idle mode to the DCR mode using the ranging request message including the ranging purpose indication field described above with reference to FIG. 7 will be described.

7 shows another example of a DCR mode entry and network re-entry procedure of a terminal according to another aspect of another embodiment of the present invention. In FIG. 7, it is assumed that the ranging purpose indication field follows the form of Table 6.

Referring to FIG. 7, when the SON-related operation of the base station is resetting the base station, the base station sets an action type field of the AAI_SON-ADV message to a value indicating ABS reconfiguration (eg 0b000) and disables the start time ( UST) and a non-available time interval (UTI) value are included in the broadcast (S701).

When the terminal receives the AAI_SON-ADV message transmitted from the base station in the idle mode in a paging period according to the paging cycle, etc., the ranging request message with the ranging purpose indication field set to 0b0111 before the time indicated by the UST field is transmitted to the base station. It transmits (S702).

When the base station accepts the DCR mode entry request of the terminal, the base station transmits a ranging response (AAI_RNG-RSP) message with an action code set to 0x04 to the terminal, and the terminal receives the terminal enters the DCR mode (S703). ).

If the section indicated by the UTI field has elapsed from the time point indicated by the UST field, the BS reconfiguration procedure has been completed. Therefore, the UE indicates a ranging purpose indication field in the DCR mode. The ranging request (AAI_RNG-REQ) message including the CRID is set to a value (0b1000) and is transmitted to the base station (S704).

Thereafter, if a ranging response (AAI_RNG-RSP) message is received from the base station, the terminal may operate in a normal mode (S705).

제 3 양상3rd aspect

In another aspect of another embodiment of the present invention, there is provided a method for an UE to enter a DCR mode by instructing the UE registered with the UE to enter the DCR mode unsolicited.

As a method for requesting the UE to enter the DCR mode according to this aspect, an unsolicited AAI_DREG-RSP message in which an action code is set to a specific value may be used. At this time, the specific value of the operation code is preferably newly defined, the definition is as follows.

Action code of AAI_DREG-RSP message = 0x0N: AMS shall begin DCR mode initiation: to signal AMS to begin DCR mode in unsolicited manner. This option is valid when the ABS reconfigures or restart the system.

If the operation code is 0x0N, the following parameters are also preferably delivered together through an unsolicited AAI_DREG-RSP message.

UST: Unavailability start time of ABS

UTI: Unavailable time interval of the ABS

In addition, in response to an unsolicited AAI_DREG-RSP (action code = 0x0N), the UE transmits AAI_DREG-REQ to request the base station to enter the DCR mode, and in this embodiment, a Deregistration request code for this purpose. Newly proposed as follows.

-Deregistration request code of AAI_DREG-REQ message = 0x0M: response for the unsolicited AAI_DREG-RSP message with action code 0x05 or 0x0N by the ABS. (N value and M value are preferably any one of reserved bits.)

Alternatively, the existing deregistration request code 0x02 may be modified as follows.

-Deregistration request code of AAI_DREG-REQ message = 0x02: response for the unsolicited AAI_DREG-RSP message with action code 0x05 or 0x0N by the ABS.

Hereinafter, the DCR mode entry method according to this aspect based on the field setting of the above-described message will be described with reference to FIG. 8.

Referring to FIG. 8, when the base station resets configuration information (ABS reconfiguration) or restarts the system (ABS restart), the base station transmits an AAI_DREG-RSP (action code 0x0N) message in an unsolicited manner to the terminal before the UST. It transmits (S801).

At this time, the unsolicited AAI_DREG-RSP message includes the UST and UTI fields.

When the terminal receives the unsolicited AAI_DREG-RSP (action code = 0x0N), it transmits AAI_DREG-REQ (Deregistration request code = 0x02) to request the base station to enter the DCR mode in response. In this case, the UE may set a polling bit in a MAC Control Extended Header (MCEH) in order to receive an ACK (ie, AAI_MSG-ACK message) for an AAI_DREG-REQ message from the base station (S802).

The base station receives AAI_DREG-REQ (action code = 0x02) from the terminal, confirms that the polling bit is set in the MCEH, and transmits an AAI_MSG-ACK message. When the terminal receives the AAI_MSG-ACK message from the base station transitions to the DCR mode (S803).

When the period indicated by the UTI field has elapsed from the time point indicated by the UST field, the resetting or restarting procedure of the base station will be completed. Therefore, the terminal indicates that the ranging purpose indication field indicates network reentry in the DCR mode. A ranging request (AAI_RNG-REQ) message including a CRID set to 0b1000 is transmitted to the base station (S804).

Thereafter, if a ranging response (AAI_RNG-RSP) message is received from the base station, the terminal may operate in a normal mode (S805).

Meanwhile, according to this aspect, the base station may efficiently instruct the terminal to enter the DCR mode through the unsolicited AAI_SON-ADV message instead of the unsolicited AAI_DREG-RSP message. This is because the AAI_DREG-RSP message is a unicast message, whereas the AAI_SON-ADV message is a broadcast message, and thus, signaling overhead can be expected to be reduced since the AAI_SON-ADV message can indicate a plurality of UEs to enter the DCR mode in one transmission. have.

For the above-described DCR mode execution procedure, it is proposed to define an action code field for requesting the UE to transition to DCR mode in an action type field of a general AAI_SON-ADV message. Field settings of the AAI_SON-ADV message according to another aspect of the present embodiment are as follows.

First, the operation type field may be set as shown in Table 7 below.

TABLE 7

Referring to Table 7, the UST and UTI fields may be included when the operation type is set to 0b000, 0b001 or 0b010. Also, when the operation type is set to 0b000, 0b001, 0b010 or 0b011, the operation code (see Table 6 below) Action code) field may be included.

Table 8

Referring to Table 8, when the operation code field is set to 0b00, the terminal is instructed to attempt to enter the network to the neighboring base station, the AAI_SON-ADV message may include the target preferred BS information (target preferred BS list) have.

In addition, when the operation code field is set to 0b01, it may be instructed to enter the DCR mode to the terminal. In this case, the terminal may request the base station to enter the DCR mode through the AAI_DREG-REQ message. The deregistration request code 0x02 of the AAI_DREG-REQ message may be modified as follows.

-Deregistration request code of AAI_DREG-REQ message = 0x02: a) response for the unsolicited AAI_DREG-RSP message with action code 0x05 by the ABS b) response for the AAI_SON-ADV message with action type (1st, 2nd, 3rd, or 4th value) and action code (0b01)

Hereinafter, a DCR mode entry method according to another aspect of the present embodiment will be described with reference to FIG. 9 based on the field setting of the above-described message.

Referring to FIG. 9, when the base station resets configuration information (ABS reconfiguration) or restarts the system (ABS restart), the base station broadcasts an AAI_SON-ADV (action code 0x01) message in an unsolicited manner before the UST. (S901).

At this time, the unsolicited AAI_SON-ADV message includes the UST and UTI fields.

When the terminal receives the unsolicited AAI_SON-ADV (action code = 0x01), the terminal transmits AAI_DREG-REQ (Deregistration request code = 0x02) to request the base station to enter the DCR mode in response. In this case, the UE may set a polling bit in the MAC Control Extended Header (MCEH) to receive an ACK (ie, AAI_MSG-ACK message) for the AAI_DREG-REQ message from the base station (S902).

The base station receives AAI_DREG-REQ (action code = 0x02) from the terminal, confirms that the polling bit is set in the MCEH, and transmits an AAI_MSG-ACK message. When the UE receives the AAI_MSG-ACK message from the base station, the UE transitions to the DCR mode (S903).

When the period indicated by the UTI field has elapsed from the time point indicated by the UST field, the resetting or restarting procedure of the base station will be completed. Therefore, the terminal indicates that the ranging purpose indication field indicates network reentry in the DCR mode. A ranging request (AAI_RNG-REQ) message including a CRID set to 0b1000 is transmitted to the base station (S904).

After receiving the ranging response (AAI_RNG-RSP) message from the base station, the terminal may operate in the normal mode (S905).

제 4 양상4th aspect

In another aspect of another embodiment of the present invention, an operation procedure is defined when the terminal receives AAI_SON-ADV in which an action type field is set to base station reliability.

If the Action type of the AAI_SON-ADV message is set to ABS Reliability, the Reason field may be set as shown in Table 9 below.

Table 9

At this time, in this aspect, when the Reason field value is 0b000 (Power Down), 0b001 (Power reduction), and 0b011 (Backhaul link down), it is suggested that the terminal searches for another preferred base station (preferred ABS) to perform initial network entry. This will be described with reference to FIG. 10.

Referring to FIG. 10, when a base station performs an ABS reliability operation for any one of power down, power reduction, or backhaul link down in relation to a SON. The base station sets the action type field to a value (0b011) indicating the base station reliability and broadcasts the AAI_SON-ADV message by setting the value to a value corresponding to the reason field (S1001).

In this case, the AAI_SON-ADV message may include recommended BSID list.

Upon receiving the AAI_SON-ADV message from the base station, the terminal may attempt initial network entry (Initial Network Entry) to the neighboring preferred base station (S1002).

In this case, the terminal may refer to the recommended base station information included in the AAI_SON-ADV message. In addition, if the time until the UST is sufficient, the terminal may perform a handover to the neighboring preferred base station.

단말 및 기지국 구조Terminal and base station structure

Hereinafter, as another embodiment of the present invention, a terminal and a base station (FBS, MBS) in which the above-described embodiments of the present invention can be performed will be described.

The terminal may operate as a transmitter in uplink and operate as a receiver in downlink. In addition, the base station may operate as a receiver in the uplink, and may operate as a transmitter in the downlink. That is, the terminal and the base station may include a transmitter and a receiver for transmitting information or data.

The transmitter and receiver may include a processor, module, part, and / or means for carrying out the embodiments of the present invention. In particular, the transmitter and receiver may include a module (means) for encrypting the message, a module for interpreting the encrypted message, an antenna for transmitting and receiving the message, and the like. An example of such a transmitter and a receiver will be described with reference to FIG.

Referring to FIG. 11, the left side shows the structure of the transmitter and the right side shows the structure of the receiver. Each of the transmitting end and the receiving end includes an antenna 5, 10, a

processor

20, 30, a transmission module (Tx module 40, 50), a receiving module (Rx module 60, 70) and a

memory

80, 90. It may include. Each component may perform a function corresponding to each other. Hereinafter, each component will be described in more detail.

The antennas 5 and 10 transmit the signals generated by the

transmission modules

40 and 50 to the outside, or receive the radio signals from the outside and transmit the signals to the receiving

modules

60 and 70. When the multiple antenna (MIMO) function is supported, two or more may be provided.

The antenna, the transmission module and the reception module may together constitute a radio communication (RF) module.

Processors

20 and 30 typically control the overall operation of the entire mobile terminal. For example, a controller function for performing the above-described embodiments of the present invention, a medium access control (MAC) frame variable control function, a handover function, an authentication and encryption function, etc. according to service characteristics and a propagation environment may be used. Can be performed.

More specifically, the

processors

20 and 30 may perform overall control for performing the above-described DCR mode operation.

Hand over, authentication and encryption functions may be performed.

More specifically, the

processors

In particular, the processor of the terminal controls the wireless communication module for the DCR mode operation according to an embodiment of the present invention described above, a broadcast message (for example, AAI_DCR-ADV message alone or instructing to enter the DCR mode) Receives AAI_DCR-ADV and MCEH with polling bit set, and accordingly requests to enter DCR mode (AAI_DREG-REQ message or AAI_MSG-ACK message or band request code and fast access message with deregistration request code 0x04 set). May be controlled to be transmitted to the base station.

Thereafter, the processor of the UE checks the detection result of the DCR mode entry request in the DR-ACK bitmap of the AAI_DCR-ADV message broadcasted by the base station, and accordingly performs the DCR mode entry, DCR mode entry re-request, or other base station. It may be controlled to perform a handover.

In addition, the processor of the terminal controls the wireless communication module for the DCR mode operation according to another embodiment of the present invention described above, a broadcast message for instructing the entry into the DCR mode from the base station (eg, unsolicited AAI_SON-ADV message ) Or a unicast message (e.g., an unsolicited AAI_DREG-RSP message), and a message (AAI_DREG-REQ message with deregistration request code 0x04 or 0x02 set) to request entry into DCR mode accordingly. Can be controlled.

Thereafter, the processor of the terminal may enter the DCR mode when a response message (AAI_DREG-RSP or AAI_MSG-ACK) of the base station is received.

In addition, the processor of the terminal may perform the overall control operation of the operation process disclosed in the above embodiments.

The

transmission modules

40 and 50 may perform a predetermined encoding and modulation on data scheduled from the

processors

20 and 30 to be transmitted to the outside, and then transmit the data to the antenna 10.

The receiving

module

60, 70 decodes and demodulates a radio signal received through the antennas 5, 10 from the outside to restore the original data to the

processor

20, 30. I can deliver it.

The

memory

80, 90 may store a program for processing and controlling the

processor

20, 30, or may perform a function for temporarily storing input / output data. In addition, the

memory

80, 90 may be a flash memory type, a hard disk type, a multimedia card micro type, a card type memory (eg, SD or XD memory). Etc.), random access memory (RAM), static random access memory (SRAM), read-only memory (ROM), electrically erasable programmable read-only memory (EPEROM), programmable read-only memory (PROM), At least one type of storage medium may include a magnetic memory, a magnetic disk, and an optical disk.

On the other hand, the base station and the relay station has a controller function, orthogonal frequency division multiple access (OFDMA) packet scheduling, time division duplex (TDD) packet scheduling and channel for performing the above-described embodiments of the present invention. MAC frame variable control, high speed traffic real time control, handover, authentication and encryption, packet modulation and demodulation for data transmission, high speed packet channel coding and real time modem The control function may be performed through at least one of the above-described modules, or may further include additional means, modules, or parts for performing such a function.

The invention can be embodied in other specific forms without departing from the spirit and essential features of the invention. Accordingly, the above detailed description should not be construed as limiting in all aspects and should be considered as illustrative. The scope of the invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the invention are included in the scope of the invention. In addition, the claims may be incorporated into claims that do not have an explicit citation relationship in the claims, or may be incorporated into new claims by post-application correction.

The method for obtaining neighboring legacy base station information, the procedure for performing handover using the same, and the device structure therefor in the broadband wireless access system as described above have been described based on the example applied to the IEEE802.16m system, but in addition to the IEEE802.xx system, the 3GPP It is possible to apply to various other mobile communication systems such as / 3GPP2.

Claims

In the broadband wireless access system, the terminal performs a content retention deregistration (DCR) mode according to the request of the base station,

Receiving a first broadcast message instructing entry into the DCR mode from a base station;

Transmitting a second message requesting entry of the DCR mode to the base station;

Receiving a third broadcast message including acknowledgment (ACK) information indicating whether the second message is detected; And

When the ACK information indicates successful detection of the second message, entering the DCR mode.
The method of claim 1,

The first broadcast message,

And transmission opportunity offset information indicating an uplink resource for transmitting the second message and an identifier for identifying the terminal in the DCR mode,

The ACK information is configured in the form of a bitmap.

And the second message is transmitted through an uplink resource indicated by the transmission opportunity offset information.
The method of claim 2,

If a bit for the terminal in the bitmap indicates the detection failure of the second message,

Retransmitting the second message to the base station; or

And performing a handover to another base station.
The method of claim 1,

The first broadcast message,

Action code field is a DCR announcement (AAI_DCR-ADV) message is set to a value indicating the entry into the DCR mode,

The third broadcast message,

The operation code field is the DCR announcement message set to a value indicating a response to the second message.
The method of claim 1,

When the first broadcast message is transmitted with a control header header (MCEH) indicating the transmission of the second message, the second message includes a message acknowledgment (AAI_MSG-ACK) message or a bandwidth request code (BR preamble sequence). Quick Access Message sent together,

And the second message is a deregistration request message with a deregistration request code set to 0x04 when the first broadcast message does not carry the control extension header.
A method of performing a content preservation deregistration (DCR) mode for at least one terminal by an unsolicited base station in a broadband wireless access system, the method comprising:

Broadcasting a first broadcast message instructing entry into the DCR mode;

Receiving a second message requesting entry of the DCR mode from the at least one terminal; And

And broadcasting a third broadcast message including acknowledgment (ACK) information respectively indicating whether the at least one second message is detected.
The method of claim 6,

The first broadcast message,

An identifier for identifying each of the at least one terminal in the DCR mode, and transmission opportunity offset information indicating an uplink resource for transmitting the second message to each of the at least one terminal;

The ACK information is configured in the form of a bitmap.

And the second message is received through an uplink resource indicated by the transmission opportunity offset information.
The method of claim 6,

The first broadcast message,

Action code field is a DCR announcement (AAI_DCR-ADV) message is set to a value indicating the entry into the DCR mode,

The third broadcast message,

The operation code field is the DCR announcement message set to a value indicating a response to the second message.
The method of claim 6,

The second message is,

The deregistration request code is a deregistration request (AAI_DREG-REQ) message set to 0x04.
The method of claim 6,

When the first broadcast message is transmitted with a control header (MCEH) indicating the transmission of the second message,

The second message is,

DCA mode execution method characterized in that the message is a quick access message (AQ_MSG-ACK) message or a quick access message transmitted with a BR preamble sequence (BR preamble sequence).
A terminal device performing content preservation deregistration (DCR mode) in a broadband wireless access system,

A processor; And

Including a radio communication (RF) module for transmitting and receiving a radio signal with the outside under the control of the processor,

The processor,

When a first broadcast message indicating entry into the DCR mode is received from a base station, a second message for requesting entry into the DCR mode is transmitted to the base station, and an acknowledgment indicating an detection of the second message (ACK). And a third broadcast message including information) is entered from the base station and the ACK information indicates successful detection of the second message.
The method of claim 11,

The first broadcast message,

And transmission opportunity offset information indicating an uplink resource for transmitting the second message and an identifier for identifying the terminal in the DCR mode,

The ACK information is configured in the form of a bitmap.

And the second message is transmitted through an uplink resource indicated by the transmission opportunity offset information.
The method of claim 12,

If a bit for the terminal in the bitmap indicates the detection failure of the second message,

The control unit,

And retransmit the second message to the base station or perform a handover to another base station.
The method of claim 11,

The first broadcast message,

Action code field is a DCR announcement (AAI_DCR-ADV) message is set to a value indicating the entry into the DCR mode,

The third broadcast message,

And the operation code field is the DCR announcement message set to a value indicating a response to the second message.
The method of claim 11,

When the first broadcast message is transmitted with a control header header (MCEH) indicating the transmission of the second message, the second message includes a message acknowledgment (AAI_MSG-ACK) message or a bandwidth request code (BR preamble sequence). Quick Access Message sent together,

And the second message is a deregistration request message in which a deregistration request code is set to 0x04 when the first broadcast message does not carry the control extension header.