JP4695651B2 - Message transmission method in wireless connection system - Google Patents

Abstract

A method for transmitting messages to alter the operating status between a mobile station and a base station in a wireless access system comprises, at the mobile station, transmitting a first message to the base station, setting a first count to a first predetermined value and enabling a first, the first message requesting a alteration in operating status between the mobile station and the base station, whereupon expiration of the first timer before receiving a second message from the base station, the count is decremented and, if the count is above a second predetermined value, the first timer is reset and the first message is retransmitted to the base station. The method also comprises, at a base station, receiving the first message, transmitting a second message to the mobile station and enabling a second timer, whereupon expiration of the second timer, the alteration in operating status is effected.

Description

  The present invention relates to a wireless connection system, and more particularly to message transmission in a wireless connection system.

  In general, an IEEE 802.16e system that has been internationally standardized for a broadband wireless connection system is a mobile station (MS), a base station (BS), and an authentication service server (ASA). It consists only of. In this case, a common physical layer (PHY: Physical layer) and a connection control layer (MAC: Medium Access Control) are defined between the base station and the mobile station.

1. Scan
FIG. 1 is a diagram illustrating a format of a scan request (MOB-SCN-REQ) message, and FIG. 2 is a diagram illustrating a format of a scan response (eg, MOB-SCN-RSP) message.

  The mobile station measures the signal quality of a neighbor base station (neighbor BS), and determines a newly connected base station (Target BS) at the time of a handover (serving BS). Request a scanning interval. This request is made through a scan request (MOB-SCN-REQ) message shown in FIG. 1. In response to the request, the base station receives a scan response (MOB-SCN) including information related to the scan as shown in FIG. -RSP) message is transmitted to the mobile station.

2. Sleep mode
In the broadband wireless access system, a sleep mode is supported to minimize power consumption of the mobile station. A sleep mode mobile station operates with a sleep interval that increases at a constant rate. The sleep section is composed of a listening period and a sleep window.

  During the listening period, the value is fixed through the sleep request / sleep response message. During this period, the mobile station transmits to the mobile station through a broadcast MAC management message (MOB-TRF-IND) transmitted from the base station. An indication is given as to whether there is traffic or whether to perform ranging for maintaining uplink communication and maintaining appropriate downlink coding type according to signal quality. The sleep period is a period in which the mobile station receives only a minimum downlink signal from the base station in order to save power. In this sleep period, the mobile station performs scanning for neighboring base stations for handover, uplink communication maintenance, ranging for maintaining an appropriate downlink coding type based on signal quality, and the like.

  FIG. 3 is a diagram illustrating a format of a sleep request (eg, MOB-SLP-REQ) message. FIG. 4 is a diagram illustrating a format of a sleep response (eg, MOB-SLP-RSP) message.

  The sleep mode is initialized by exchanging a sleep request (MOB-SLP-REQ) message and a sleep response (MOB-SLP-RSP) message between the mobile station and the base station. In particular, the mobile station transmits a sleep request (MOB-SLP-REQ) message as shown in FIG. 3 to the base station in order to switch from the normal operation mode to the sleep mode. In response, the base station transmits a sleep response (MOB-SLP-RSP) message as shown in FIG. 4 to the mobile station.

3. Idle mode
In idle mode, when a mobile station moves in an area covered by a plurality of base stations, it receives only downlink broadcast traffic messages (MOB-PAG-ADV) transmitted periodically without registering with a specific base station. In this mode, power consumption can be prevented. In idle mode, there is no signaling requirement of the mobile station for handover, and the mobile station can save resources such as power and connection ID because it restricts the operation related to scanning.

  FIG. 5 is a diagram illustrating a format of a deregistration request (for example, DREG-REQ) message. Referring to FIG. 5, the mobile station transmits a deregistration request (DREG-REQ) message to the base station for the idle mode initialization (Initiation). In response, the base station transmits the idle mode of the mobile station. A deregistration order (DREG-CMD) message containing information related to permission is transmitted. After transmitting the DREG-CMD message to the mobile station, the base station transmits a basic connection (Basic Connection), a first connection (Primary Connection), and a standard infrastructure message (Standard-based) for transmitting / receiving a MAC management message to / from the mobile station. Management resources such as a second connection (Secondary Connection) for messages (DHCP, TFTP, etc.) are released (Release).

  FIG. 6 is a diagram illustrating an example of an operation code included in a registration cancellation command (for example, DREG-CMD) message. As described above, FIG. 6 shows an operation code included in the DREG-CMD message. The mobile station performs an operation according to an instruction represented by the operation code. For example, if the code is 0X05, the mobile station performs a de-registration procedure in the corresponding base station, and initializes the idle mode. In addition, even when the mobile station does not request the DREG-REQ message, the base station transmits the DREG-CMD (Unsolicited DREG-CMD) message having the operation code 0X05, so that the mobile station enters the idle mode. Can be.

  As described above, the mobile station transmits one of a scan request (MOB-SCN-REQ) message, a sleep request (MOB-SLP-REQ) message, and a deregistration request (DREG-REQ) message to the base station. In response, the base station waits for a scan response (MOB-SCN-RSP) message, a sleep response (MOB-SLP-RSP) message, or a deregistration command (DREG-CMD) message.

  FIG. 7 shows no signal flow when the scan request and response message is lost. FIG. 8 is a signal flow diagram illustrating a case where the sleep request and response message is lost. FIG. 9 is a signal flow diagram illustrating a case where the registration cancellation request and the command message are lost. As shown in FIG. 7 to FIG. 9, the MOB-SCN-REQ message, the MOB-SLP-REQ message, and the DREG- transmitted from the mobile station to the base station due to limited resources of the radio link and radio environmental factors. The REQ message may not be transmitted normally, or the MOB-SCN-RSP message, the MOB-SLP-RSP message, and the DREG-CMD message in which the base station responds to the mobile station may not be transmitted normally.

  However, since the current broadband wireless access system does not define a processing procedure for the next operation of the mobile station, there is a high possibility that the mobile station or the base station performs an erroneous operation.

  In the idle mode, the base station transmits the DREG-CMD message to the mobile station, and at the same time releases the established connection (basic connection, first connection and second connection). Therefore, if the mobile station cannot receive the DREG-CMD message, there is no connection (basic connection) that can be used when retransmitting the DREG-REQ. Even if the mobile station does not request the idle mode initialization through the DREG-REQ message, the DREG-CMD (Unsolicited DREG-CMD) message transmitted by the base station to switch the mobile station to the idle mode is transmitted over the air. If the mobile station is lost, the mobile station continues to operate in the normal operation mode, and the base station determines that the mobile station has switched to the idle mode, and then releases management resources for the mobile station. As a result, the mobile station can no longer transmit a message to the base station.

  Accordingly, the present invention relates to a message transmission method in a wireless connection system that substantially solves one or more problems due to the limitations and disadvantages of the prior art.

  An object of the present invention is to support message transmission between a mobile station and a base station in a wireless connection system.

  It is another object of the present invention to provide effective message transmission when a message is lost due to radio link resources and / or radio environmental factors.

  Additional advantages, objects, and features of the present invention will be set forth in part in the following detailed description, and will be apparent to those of ordinary skill in the art based on the description below, It will become apparent by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

  In order to obtain these and other advantages, and as embodied and outlined herein in accordance with the purpose of the invention, as an example, the operation between a mobile station and a base station in a wireless access system In the message transmission method for switching the state, the mobile station transmits a first message requesting the base station to switch the operation state between the mobile station and the base station, and at the same time, the first number is already set. However, if the first timer expires before receiving the second message from the base station, the number decreases, and the number has already been set. If the value is greater than or equal to two, the first timer is reset and the first message is retransmitted to the base station. The method also includes a base station that receives the first message, transmits a second message to the mobile station to approve the mobile station's request for operating state switching, and drives a second timer. When two timers expire, the operating state is switched, and the second message is retransmitted to the mobile station until another first message is received, and the second timer is reset.

  The first message is a deregistration request message (DREG-REQ), the first timer is a deregistration command waiting timer, the first number is a deregistration request retransmission number, and the operation state is switched. Switching to idle mode, the second message is a deregistration command (DREG-CMD), and the second timer is a resource management maintenance timer. The method may further include performing a scanning operation in response to the second message received from the base station at the mobile station. The method may further include entering an idle mode in response to the second message received from the base station at the mobile station.

  In another embodiment, a method for switching an operation state between a mobile station and a base station in a wireless connection system includes receiving a first message requesting a change of the operation state. The method also includes transmitting a second message that acknowledges switching of the operating state. The method also includes driving a timer. The method also includes enabling operation state switching until the timer expires, and retransmitting the second message and resetting the timer until another first message is received. Including.

  The first message is a deregistration request message (DREG-REQ), the operation state switch is a switch to idle mode, the second message is a deregistration command message (DREG-CMD), and the timer It is a resource management maintenance timer.

  As yet another embodiment, a method for switching an operation state between a mobile station and a base station in a wireless connection system includes transmitting a first message instructing switching of the operation state. The method also includes driving a first timer and setting a number of times for a previously set first value. The method also drives a second timer, but if the first timer expires before receiving a second message, the number decreases, and if the number is greater than or equal to a preset value, The first timer is reset, the first message is retransmitted, and the operation state switching is enabled when the second timer expires.

  The first message is an unsolicited deregistration command message (unsolicited DREG-REQ), the operation state is switched to idle mode, and the second message is a deregistration request message (DREG-REQ) and It is at least one of a deregistration approval message (DREG-ACK), the first timer is a deregistration response waiting timer, and the second timer is a resource management maintenance timer.

  The above and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description of the present invention based on the accompanying drawings. It should be understood that both the foregoing general description and the following detailed description of the invention are exemplary and explanatory and that the claims provide additional description of the invention.

  The present invention is applicable to a broadband wireless connection system.

  Hereinafter, preferred embodiments of the present invention and examples shown in the accompanying drawings will be described in detail. In the drawings, the same reference numerals are used as much as possible for the same components.

  The present invention is embodied in a broadband wireless connection system. The present invention is not limited to this, and the present invention can also be applied to a wireless communication system that operates according to another standard.

  The present invention relates to a scan request (MOB-SCN-REQ) and scan response (MOB-SCN-RSP) message for a mobile station to measure the channel quality of neighboring base stations for handover in a broadband wireless access system, mobile A sleep request (MOB-SLP-REQ) message and a sleep response (MOB-SLP-RSP) message transmitted to and received from the base station to initialize the sleep mode, and the mobile station starts idle mode. A method for optimizing deregistration request (DREG-REQ) and deregistration command (DREG-CMD) messages sent to and received from a base station is proposed. In particular, the present invention proposes a message transmission procedure between a mobile station and a base station that is effective when a message is lost due to limited resources of a radio link and radio environmental factors in a broadband wireless connection system.

  Therefore, in the present invention, the mobile station operates a response waiting timer for the scan request, sleep request, and deregistration request messages, sets the number of request retries for these messages, and retransmits these request messages.

  First, when performing a scan operation, the present invention sets a scan response waiting timer and the number of scan request retries, and retransmits a scan request (MOB-SCN-REQ) message.

  The mobile station transmits a MOB-SCN-REQ message to the base station and simultaneously sets a scan response waiting timer. If the mobile station cannot receive a MOB-SCN-RSP message from the base station before the timer expires, it considers that the MOB-SCN-REQ message or the MOB-SCN-RSP message has been lost on the radio link; If the scan request retry count remains, the MOB-SCN-REQ message is retransmitted to the base station.

  Table 1 is an exemplary diagram illustrating the drive time of the scan response waiting timer and the number of scan request retries according to the present invention.

なお、本発明は、睡眠モードの初期化を行うとき、睡眠応答待機タイマーと睡眠要請再試み回数を設定して、睡眠要請（ＭＯＢ−ＳＬＰ−ＲＥＱ）メッセージの再伝送を行う。

In the present invention, when the sleep mode is initialized, the sleep request waiting timer and the sleep request retry count are set, and the sleep request (MOB-SLP-REQ) message is retransmitted.

  The mobile station transmits a sleep request (MOB-SLP-REQ) message to the base station and simultaneously sets a sleep response waiting timer. If the sleep response message is not received from the base station within a specific timer period, the mobile station considers that the MOB-SLP-REQ message or the MOB-SLP-RSP message has been lost on the radio link, If it remains, retransmit the MOB-SLP-REQ message to the base station.

  Table 2 is an exemplary diagram of the driving time of the sleep response waiting timer and the number of sleep request retries according to the present invention.

また、本発明は、遊休モードを初期化するとき、登録解除命令待機タイマーと登録解除要請再試み回数を設定して、登録解除要請（ＤＲＥＧ−ＲＥＱ）メッセージの再伝送を行う。

In the present invention, when the idle mode is initialized, a registration cancellation command waiting timer and a registration cancellation request retry count are set, and a registration cancellation request (DREG-REQ) message is retransmitted.

  The mobile station transmits a deregistration request (DREG-REQ) message to the base station and simultaneously sets a deregistration command waiting timer. If the non-registration command message is not received from the base station within the specified timer time, the mobile station considers that the DREG-REQ message or the DREG-CMD message has been lost on the radio link, and the number of possible unregistration requests remains If so, retransmit the DREG-REQ message to the base station.

  Table 3 is an exemplary diagram illustrating the driving time of the deregistration command waiting timer and the deregistration request retry count according to the present invention.

この場合、基地局は移動局にＤＲＥＧ−ＣＭＤメッセージを伝送すると同時に、管理資源維持タイマー（Ｍａｎａｇｅｍｅｎｔ Ｒｅｓｏｕｒｃｅ Ｈｏｌｄｉｎｇ Ｔｉｍｅｒ）を設定し、一定期間接続を維持する。以降、前記管理資源維持タイマーが満了すると、維持していた管理資源を解除する。

In this case, the base station transmits a DREG-CMD message to the mobile station, and at the same time, sets a management resource maintenance timer (Management Resource Holding Timer) and maintains the connection for a certain period. Thereafter, when the management resource maintenance timer expires, the maintained management resource is released.

  Table 4 is an example of a management resource maintenance timer according to the present invention.

表５は、本発明による登録解除応答待機タイマーの駆動時間と登録解除命令再試み回数の例示図である。

Table 5 is an exemplary diagram illustrating the drive time of the deregistration response waiting timer and the deregistration command retry count according to the present invention.

表６は、本発明によって移動局が基地局から要請しなかった登録解除命令（ｕｎｓｏｌｉｃｉｔｅｄ ＤＲＥＧ−ＣＭＤ）メッセージを受信した場合、ＤＲＥＧ−ＲＥＱメッセージで応答するための登録解除要請符号を示す。

Table 6 shows a deregistration request code for responding with a DREG-REQ message when the mobile station receives an unregistered DREG-CMD message that the mobile station has not requested from the base station according to the present invention.

表７は、本発明によって移動局が、基地局から要請しなかった登録解除命令（ｕｎｓｏｌｉｃｉｔｅｄ ＤＲＥＧ−ＣＭＤ）メッセージを受信した場合、ＤＲＥＧ−ＡＣＫメッセージで応答するためのメッセージフォーマットを示す。

Table 7 shows a message format for responding with a DREG-ACK message when the mobile station receives an unregistered DREG-CMD message not requested from the base station according to the present invention.

図１０は、本発明の一実施例によるスキャン応答待機タイマーを用いたスキャン要請及び応答メッセージの流れ図である。

FIG. 10 is a flowchart of a scan request and response message using a scan response waiting timer according to an embodiment of the present invention.

  Referring to FIG. 10, the mobile station transmits a scan request (MOB-SCN-REQ) message to the base station and simultaneously drives a scan response waiting timer. If the scan response (MOB-SCN-RSP) message cannot be received from the base station until the scan response waiting timer expires, the mobile station checks whether or not the number of scan requestable times remains. If the number of scan requests remains, the MOB-SCN-REQ message is retransmitted to the base station after resetting the timer. Thereafter, when a scan response (MOB-SCN-RSP) message is received from the base station within the scan response waiting timer time, the mobile station performs a scanning operation according to information included in the corresponding response message.

  FIG. 11 is a flowchart of a sleep request and response message using a sleep response waiting timer according to an embodiment of the present invention.

  Referring to FIG. 11, the mobile station transmits a sleep request (MOB-SLP-REQ) message to the base station and simultaneously drives a sleep response waiting timer. If the sleep response (MOB-SLP-RSP) message cannot be received from the base station until the sleep response waiting timer expires, the mobile station checks whether the number of sleep request available times remains. If the sleep request count remains, the mobile station resets the timer and then retransmits the MOB-SLP-REQ message to the base station. Thereafter, when a sleep response (MOB-SLP-RSP) message is received from the base station within the sleep response waiting timer time, the mobile station performs a sleep mode operation according to the information included in the corresponding response message.

  FIG. 12 is a flowchart of a deregistration request and command message using a deregistration command wait timer according to an embodiment of the present invention (for example, when a deregistration request message transmitted by a mobile station is lost over the air).

  Referring to FIG. 12, the mobile station transmits a deregistration request (DREG-REQ) message to the base station and simultaneously drives a deregistration command waiting timer. If the deregistration command (DREG-CMD) message cannot be received from the base station until the deregistration command wait timer expires, the mobile station checks whether the number of deregistration request retry attempts still remains. As a result of the confirmation, if the deregistration request retry count remains, the mobile station resets the timer and then retransmits the DREG-REQ message to the base station. Thereafter, when receiving the DREG-CMD message from the base station within the registration cancellation command waiting timer time, the mobile station performs an idle mode operation according to the information included in the corresponding response message.

  FIG. 13 is a flowchart of a deregistration request and command message using a deregistration command wait timer according to another embodiment of the present invention (for example, when a deregistration command message transmitted by a base station is lost over the air). .

  Referring to FIG. 13, the base station transmits a DREG-CMD message to the mobile station, and simultaneously drives a management resource maintenance timer. If the DREG-CMD message is lost over the air, the mobile station retransmits the DREG-REQ through the basic connection maintained by the management resource maintenance timer after the deregistration command wait timer expires. To do. In response to this, the base station transmits DREG-CMD to the mobile station and resets the management resource maintenance timer. When the management resource maintenance timer expires after the DREG-CMD is normally transmitted to the mobile station, the base station determines that the mobile station has switched to the idle mode, and releases the management resources that have been maintained.

  14 and 15 are flowcharts illustrating a method according to another embodiment of the present invention.

  Referring to FIG. 14 and FIG. 15, the technical feature according to the present invention is that even if the mobile station does not request idle mode initialization through the DREG-REQ message, the base station does not request transmission to the mobile station. This is applied when the unregistered DREG-CMD message is lost over the air.

  The base station transmits a deregistration command (Unsolicited DREG-CMD) message not requested to the mobile station, and simultaneously drives a management resource maintenance timer (management resource holding timer) and a deregistration command response waiting timer. It is checked whether or not a predetermined time that has already been set has elapsed. If a registration cancellation response message (DREG-REQ in FIG. 14 or DREG-ACK in FIG. 15) cannot be received from the mobile station as a reception confirmation response to the Unsolicited DREG-CMD until the registration cancellation response waiting timer expires, The mobile station confirms whether the number of registration cancellation instructions that can be set already remains. As a result of the confirmation, if the deregistration command count remains, the base station resets the management resource maintenance timer, then retransmits the Unified DREG-CMD message to the mobile station, and restarts the management resource maintenance timer. Set. Thereafter, upon receiving a deregistration response (DREG-REQ or DREG-ACK) message from the mobile station within the deregistration response waiting timer time, the base station maintained after the management resource maintenance timer expired Release management resources for the mobile station.

  FIG. 14 shows a case where the mobile station transmits a deregistration response message to the base station, as shown in Table 6, in which an existing deregistration request message is transformed and the deregistration response message is transmitted. . FIG. 15 shows a case where the deregistration response message is transmitted through a DREG-ACK message as in the example of Table 7.

  As an embodiment of the present invention, a message transmission method for switching an operation state between a mobile station and a base station in a wireless connection system is the mobile station, wherein the mobile station and the base station have an operation state between the mobile station and the base station. A first message for requesting switching is transmitted, and at the same time, the first number is set to the first value set and the first timer is driven, but before the second message is received from the base station, the first message is sent. The number of times decreases when one timer expires, and if the number is equal to or greater than a preset second value, the first timer is reset and the first message is retransmitted to the base station. including. The method also includes a base station that receives the first message, transmits a second message to the mobile station to approve the mobile station's request for operating state switching, and drives a second timer. When two timers expire, the operating state is switched, and the second message is retransmitted to the mobile station until another first message is received, and the second timer is reset.

  The first message is a deregistration request message (DREG-REQ), the first timer is a deregistration command waiting timer, the first number is a deregistration request retransmission number, and the operation state is switched. Switching to idle mode, the second message is a deregistration command (DREG-CMD), and the second timer is a resource management maintenance timer. The method may further include performing a scanning operation in response to the second message received from the base station at the mobile station. The method may further include entering an idle mode in response to the second message received from the base station at the mobile station.

  In another embodiment, a method for switching an operation state between a mobile station and a base station in a wireless connection system includes receiving a first message requesting a change of the operation state. The method also includes transmitting a second message that acknowledges switching of the operating state. The method also includes driving a timer. The method also includes enabling operation state switching until the timer expires, and retransmitting the second message and resetting the timer until another first message is received. Including.

  The first message is a deregistration request message (DREG-REQ), the operation state switch is a switch to idle mode, the second message is a deregistration command message (DREG-CMD), and the timer It is a resource management maintenance timer.

  As yet another embodiment, a method for switching an operation state between a mobile station and a base station in a wireless connection system includes transmitting a first message instructing switching of the operation state. The method also includes driving a first timer and setting a number of times for a previously set first value. The method also drives a second timer, but if the first timer expires before receiving a second message, the number decreases, and if the number is greater than or equal to a preset value, The first timer is reset, the first message is retransmitted, and the operation state switching is enabled when the second timer expires.

  The first message is an unsolicited deregistration command message (unsolicited DREG-REQ), the operation state is switched to idle mode, and the second message is a deregistration request message (DREG-REQ) and It is at least one of a deregistration approval message (DREG-ACK), the first timer is a deregistration response waiting timer, and the second timer is a resource management maintenance timer.

  Accordingly, the present invention provides an effective processing procedure capable of preventing malfunction of a mobile station or base station resulting from message loss due to limited radio link resources and / or radio environmental factors in a wireless access system. To do. In particular, the present invention transmits a scan request, a sleep request, and a deregistration request message, and operates a response waiting timer. Accordingly, even if the request message or the response message is lost, the corresponding request message is retransmitted after the timer expires.

  It will be apparent to those skilled in the art that various modifications can be made in the present invention without departing from the spirit or scope of the invention. Accordingly, it is to be understood that the invention includes various modifications provided within the scope of the appended claims and their equivalents.

It is a figure which shows the format of a scan request (MOB-SCN-REQ) message. It is a figure which shows the format of a scan response (for example, MOB-SCN-RSP) message. It is a figure which shows the format of a sleep request (for example, MOB-SLP-REQ) message. It is a figure which shows the format of a sleep response (for example, MOB-SLP-RSP) message. It is a figure which shows the format of a registration cancellation request (for example, DREG-REQ) message. It is a figure which shows the operation | movement code contained in a registration cancellation | release instruction | command (for example, DREG-CMD) message. 7 is a signal flow diagram illustrating a case where a scan request and a response message are lost. 7 is a signal flow diagram illustrating a case where a sleep request and a response message are lost. It is a signal flowchart which shows the case where a registration cancellation request and a command message are lost. 4 is a flowchart of a scan request and response message using a scan response waiting timer according to the present invention. 4 is a flowchart of a sleep request and response message using a sleep response waiting timer according to an embodiment of the present invention. 6 is a flowchart of a registration cancellation request and command message using a registration cancellation command waiting timer according to an embodiment of the present invention (for example, when a registration cancellation request message transmitted by a mobile station is lost over the air). 7 is a flowchart of a deregistration request and command message using a deregistration command waiting timer according to another embodiment of the present invention (for example, when a deregistration command message transmitted by a base station is lost over the air). 6 is a flowchart illustrating a method according to another embodiment of the present invention. 6 is a flowchart illustrating a method according to another embodiment of the present invention.

Claims (14)

A method for efficiently supporting idle mode operation in a wireless connection system,
A base station transmits a deregistration command (DREG-CMD) message for starting the idle mode to the mobile terminal without requesting the mobile terminal;
Activating a deregistration response wait timer for receiving a deregistration request (DREG-REQ) message including a deregistration request code indicating a response to the deregistration command message;
The base station setting a deregistration instruction count;
Activating a management resource maintenance timer for maintaining management resources after transmitting the deregistration command message to the mobile terminal;
Including
The base station retransmits the deregistration command message when the deregistration response wait timer expires before receiving the deregistration request message and before the deregistration command count expires. An idle mode operation support method. The idle mode according to claim 1, further comprising receiving the deregistration request message in response to the deregistration command message before the deregistration response waiting timer expires. Operation support method. The idle mode operation support method according to claim 1, wherein the management resource includes connection information between the base station and the mobile terminal. 4. The idle mode operation support method according to claim 3, wherein the connection information includes information on at least one of a basic connection, a primary connection, and a secondary connection. The idle mode operation support method according to claim 1, further comprising a step of decreasing the deregistration command count when the base station retransmits the deregistration command message to the mobile terminal. 6. The idle mode operation support method according to claim 5, wherein, when the deregistration command count expires, the base station does not retransmit the deregistration command message. The idle mode operation support method according to claim 1, wherein the deregistration request code is set to 0x02. A base station that efficiently supports idle mode operation in a wireless connection system,
A transmission means for transmitting a deregistration command (DREG-CMD) message for starting the idle mode to a mobile terminal;
Receiving means for receiving a deregistration request (DREG-REQ) message from the mobile terminal;
A deregistration response waiting timer that operates during a waiting time for receiving the deregistration request message;
A management resource maintenance timer that operates during the time to maintain the management resources after transmitting the deregistration command message;
Including
The base station activates the deregistration response waiting timer and the management resource maintenance timer after transmitting the deregistration command message to the mobile terminal, and indicates a deregistration command count indicating the number of times that the deregistration command message can be retransmitted. Configured to set
The base station retransmits the deregistration command message to the mobile terminal when the deregistration response waiting timer expires before receiving the deregistration request message and before the deregistration command count expires. A base station characterized by: The base station according to claim 8, wherein the base station receives the deregistration request message as a response to the deregistration command message before the deregistration response waiting timer expires. The base station according to claim 8, wherein the management resource includes connection information between the base station and the mobile terminal. The base station according to claim 10, wherein the connection information includes information related to at least one of a basic connection, a primary connection, and a secondary connection. The base station according to claim 8, wherein the base station decreases the deregistration command count when retransmitting the deregistration command message to the mobile terminal. The base station of claim 12, wherein the base station does not retransmit the deregistration command message when the deregistration command count expires. The deregistration request message includes a deregistration request code indicating that it is a response to the deregistration command message,
The base station according to claim 8, wherein the deregistration request code is set to 0x02.

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