KR20060029905A - Method for renewing sleep-cid in broadband wireless access systems - Google Patents

Abstract

 The present invention provides a method for updating a sleep mode connection ID of a wideband wireless access system by a mobile terminal transmitting a list of sleep mode connection IDs to a base station through a ranging request message; The base station receiving the message performs a process of updating the sleep mode connection ID by referring to the sleep mode connection ID list.

The present invention, unlike the prior art that had to end the sleep mode of the mobile terminal to update the sleep mode connection ID, so that the update of the sleep mode connection ID is performed while maintaining the sleep mode of the mobile terminal, sleep mode operation The power consumption of the mobile terminal is greatly reduced. In addition, the sleep mode connection ID update method according to the present invention prevents the waste of radio resources due to the broadcast of the traffic notification message by significantly reducing the number of broadcasts of the traffic notification message, as compared with the conventional method which had to end the sleep mode of the mobile terminal. .

Sleep interval, Sleep Mode, Sleep CID

Description

How to update sleep mode connection ID of broadband wireless access system {METHOD FOR RENEWING SLEEP-CID IN BROADBAND WIRELESS ACCESS SYSTEMS}

1 is a diagram illustrating a signal transmission process according to a conventional sleep mode procedure.

2 is a diagram illustrating an update procedure of a sleep mode connection ID according to the present invention;

The present invention relates to a sleep mode of a broadband wireless access system, and more particularly, to a method for updating a sleep connection identifier (Sleep Connection IDentifier or Sleep CID) of a broadband wireless access system.

The broadband wireless access system supports the sleep mode to minimize the power consumption of the mobile terminal. The mobile terminal of the sleep mode operates according to a sleep interval that increases at a constant rate, wherein the sleep interval is composed of a listening interval and a sleep interval.

The length of the listening period is fixed by the sleep request and sleep response message, and during the listening period, the mobile station is directed downward to the mobile terminal through a traffic notification message (MOB-TRF-IND) transmitted from the base station in a broadcast form. It is instructed whether there is traffic or whether ranging should be performed to maintain uplink and maintain the appropriate downlink coding type according to signal quality.

The length of the sleep period is determined by the sleep window, and during the sleep period, the mobile terminal receives only a minimum downlink signal from the base station to minimize power consumption. During the sleep period, the mobile station performs operations such as scanning for searching for neighbor base stations for handover, ranging for maintaining uplink communication, and maintaining an appropriate downlink coding type according to signal quality.

The sleep mode operation moves MAC management messages such as a sleep request (MOB-SLP-REQ) message, a sleep response (MOB-SLP-RSP) message, and a traffic notification (MOB-TRF-IND) message transmitted in a broadcast form. The terminal and the base station are made by exchanging with each other.

Table 1 below shows an example of a sleep request (MOB-SLP-REQ) message used for sleep mode operation.

Syntax Size Notes SLP-REQ Message Format () { Management Message Type = 50 8 bits Initial-sleep window 6 bits Final-sleep-window base 10 bit Listening interval 4 bits Final-sleep-window exponent 3 bits N_Sleep_CID For (I = 0; i <N_Sleep_CID; i ++) {  Sleep_CID 16 bits } Reserved 1 bits }

The sleep request (MOB-SLP-REQ) message of [Table 1] is delivered by the mobile station to request the sleep mode from the mobile station, and includes parameters for sleep period and listening period.

Table 2 below shows an example of a sleep response (MOB-SLP-RSP) message.

Syntax Size Notes MOB-SLP-RSP Message Format () { Management Message type = 51 8 bits Sleep-approved 1 bit                                                  0: Reject sleep mode request 1: Require sleep mode request If (Sleep-approved == 0) {                                                  REQ-duration 7 bits Time duration     } else { If (SHO or FBSS capability enabled) { if SHO or FBSS capability is enabled in the REG-REQ / RSP message exchange. Maintain Active set and Anchor BS ID 1 bit 1: Active set and Anchor BS ID is maintained in SHO / FBSS duration, in sleep mode. 0: Active set and Anchor BS ID is not maintained during sleep mode. If (Active set and Anchor BS ID maintained) {         SHO / FBSS duration (s) 3 bits After entering sleep mode, the Active set and Anchor BS ID is maintained for 10x2 ^ s frames.       }     } Start frame 6 bits initial-sleep window 6 bits final-sleep window base 10 bits listening interval 4 bits final-sleep window exponent 3 bits SLPID 10 bits Sleep duration 8 bits In units of 20ms frames TLV encoded information } Padding Variable To ensure octet aligned }

The sleep response (MOB-SLP-RSP) message of [Table 2] is delivered by the service base station to the mobile terminal as a response to the sleep request, and related to sleep mode such as whether to allow sleep mode, sleep period, listening period, and sleep ID. Contains parameters.                         

Table 3 below shows an example of a MOB-TRF-IND message.

Syntax Size Notes MOB-TRF-IND Message Format () { Management Message type = 52 8 bits FMT 1 bit 0: SLPID bitmap based format 1: CID based format if (FMT == 0) { reserved 7 bits SLPID Group Indication bit-map                                                  32 bits                                                                                                        Nth bit of SLPID-Group indication bit-map [MSB corresponds to N = 0] is allocated to SLPID Group that includes MSSs with SLPID values from N * 32 to N * 32 + 31 Meaning of this bit 0: there is no traffic for 32 MSSs which belong to the SLPIDs-Group 1: there is traffic for at least one MSS in SLPIDs-Group Traffic Indication bit-map                                                  Variable                                                                                                         Traffic Indication bit map comprises the multiples of 32-bits long Traffic Indication unit. A Traffic Indication unit for 32 SLPIDs is added to MOB_TRF-IND message whenever its SLPID Group is set to '1' 32bits of Traffic Indication unit (starting from MSB) are allocated to MSSs in the ascending order of their SLPID values 0: Negative Indication 1: Positive Indication } else {   Num-pos 7 bits Number of CIDs on the positive Indication list for (i = 0; i <Num-pos: i ++) {     Short Basic CID 12 bits 12 least significant bits of the Basic CID       }      While (! (Byte_boundary)) {   Padding bits 7 <= bits Padding for byte alignment }  } }

The traffic notification (MOB-TRF-IND) message of Table 3 is a broadcast message that the service base station delivers to the mobile station at regular time intervals. The mobile terminal in the sleep mode receiving the traffic notification message determines whether to maintain the sleep mode for the listening period, to end the sleep mode and receive the downlink data, or to perform the ranging during the sleep period.

Hereinafter, a sleep mode switch and release procedure according to the prior art will be described.

1 illustrates a signal transmission process of a broadband wireless access system according to a conventional sleep mode procedure, and shows a process from a mobile terminal switching to a sleep mode to ending a sleep mode due to downlink traffic generation. have.

Referring to Figure 1, the conventional sleep mode procedure will be described in detail as follows.

In order to switch to the sleep mode, the mobile terminal first sets a value such as an initial sleep period, a last sleep period, a listening period, and the like, and transmits a sleep request message including these set values to the base station, thereby switching to the base station. Ask. The base station receiving the request of the mobile terminal determines whether to accept or reject the transition to the sleep mode.

When the mobile station requests the mobile station, the base station sets a value such as an initial sleep period, a last sleep period, a listening period, a start time for changing the sleep mode, and transmits a sleep response message including these set values to the mobile station. .

The mobile terminal receiving the sleep response message changes its state from the normal mode to the sleep mode when the sleep mode switch start time arrives, and maintains the state (sleep mode) for the time set as the initial sleep period.

Then, when the initial sleep period expires, the mobile station receives a traffic notification (MOB-TRF-IND) message from the base station for a time set as the listening period, and checks whether there is downlink traffic directed to itself.

If it is confirmed that there is no downward traffic directed to the mobile station, the mobile terminal maintains the sleep mode by extending the second sleep period to twice the initial sleep period.

According to this sleep period setting method (the next sleep period is set twice as much as the previous sleep period), the sleep period of the mobile terminal continues to increase until the last sleep period arrives. After the last sleep period, the sleep period length of the mobile terminal is obtained by the following equation.

final sleep window = final sleep window base x 2 ^{final window exponent}

The last sleep window (final sleep window) is set through the parameters defined in the sleep response message of [Table 2]. The sleep periods after the last sleep period are applied by the above formula.

On the other hand, when it is determined that there is downlink traffic directed to the mobile station, the mobile station switches its state from the sleep mode to the normal mode to receive the downlink traffic.

If the reception process of the downlink traffic is made through a specific connection ID, the mobile station does not end the sleep mode via the traffic notification (MOB-TRF-IND) message of [Table 3]. Through the ID (Sleep CID) can be informed to the base station. The base station buffers the downlink traffic instead of causing the mobile station to exit the sleep mode through the traffic notification message.

The problems of the conventional sleep mode procedure described above are as follows.

In the case of updating the sleep mode connection ID, the prior art specifies to do this only through the sleep request message, which means that the sleep mode currently in progress should be terminated. However, exiting the sleep mode for the purpose of simply updating the sleep mode connection ID may not be unreasonable. In particular, when the sleep window is very large, power consumption may be reduced.

In addition, there may be a waste of resources that the base station must transmit a traffic notification message for every listening period until the original sleep window is restored to the size of the original sleep window, and the mobile station has a problem of receiving the traffic notification message for every listening period. .

The present invention is to solve the problems described above, the object is,

The present invention provides a method for updating a sleep mode connection ID of a broadband wireless access system that performs update of a sleep mode connection ID while maintaining a sleep mode of a mobile terminal.

In order to achieve the above object, the present invention "method of updating the sleep mode connection ID of a broadband wireless access system" includes a process of transmitting, by a mobile terminal, a sleep mode connection ID list to a base station through a ranging request message; The base station receiving the message performs a process of updating the sleep mode connection ID by referring to the sleep mode connection ID list.

Preferably, the ranging request message is transmitted according to a periodic ranging procedure.

Preferably, the ranging request message is transmitted for the purpose of updating the sleep mode connection ID.

Preferably, the ranging request message includes a sleep mode connection ID list in the form of a type length value (TLV).

An object of the present invention is to allow a mobile terminal in a sleep mode of a broadband wireless access system to perform an update of a sleep mode connection ID through a conventional ranging procedure. In other words, the mobile terminal in the sleep mode state transmits the exceptionally exclusive of the ranging request message without ending the sleep mode. Therefore, when the ranging request message is used, the mobile terminal updates the sleep mode connection ID while maintaining the sleep mode. can do.

To this end, the present invention uses existing periodic ranging or separate ranging request messages for the purpose of updating the sleep mode connection ID.

The present invention includes a TLV (Type Length Value) item in the ranging request message to update the sleep mode connection ID. Since the length of the sleep mode connection ID is 16 bits, the total length of the TLV item is an integer multiple of 16 bits (the number of sleep mode connection IDs to be updated x 16 bits).

2 is a diagram illustrating an update procedure of a sleep mode connection ID according to the present invention.

As illustrated in FIG. 2, the sleep mode connection ID update procedure according to the present invention is performed in the process of performing a ranging procedure between the mobile station and the base station BS1.

Referring to the renewal procedure of the sleep mode connection ID according to the present invention.

The mobile terminal provides a list of sleep connection IDs to the base station through the sleep request message transmitted at the time of switching to the sleep mode. (S10) If the sleep response message is normally received from the base station, the mobile terminal connects to the corresponding sleep mode. It is recognized that the list of IDs is normally transmitted to the base station. (S20)

Subsequently, when the sleep mode connection ID is to be updated during the sleep mode, the mobile station transmits a ranging request message to the base station periodically or a ranging request message for updating the sleep mode connection ID regardless of the period. In this case, the ranging request message should include a TLV item indicating a list of sleep mode connection IDs to be updated.

Upon receiving the ranging request message, the BS performs a procedure of updating a sleep mode connection ID and transmits a ranging response message to the mobile station to inform that the list of sleep mode connection IDs has been normally updated. (S40)

As described above, the present invention, unlike the prior art that had to end the sleep mode of the mobile terminal to update the sleep mode connection ID, the update of the sleep mode connection ID is performed while maintaining the sleep mode of the mobile terminal As a result, the power consumption of the mobile terminal according to the sleep mode operation was greatly reduced.

In addition, the sleep mode connection ID update method according to the present invention prevents the waste of radio resources due to the broadcast of the traffic notification message by greatly reducing the number of broadcasts of the traffic notification message, compared to the conventional method which had to end the sleep mode of the mobile terminal. .

Although the present invention has been described with reference to the embodiments illustrated in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (4)

The mobile terminal transmitting a sleep mode connection ID list to the base station through a ranging request message; The base station receiving the message updates the sleep mode connection ID by referring to the sleep mode connection ID list, wherein the sleep mode connection ID is updated. The method of claim 1, wherein the ranging request message The method of updating a sleep mode connection ID of a broadband wireless access system, characterized in that being transmitted according to a periodic ranging procedure. The method of claim 1, wherein the ranging request message A sleep mode connection ID update method of a broadband wireless access system, characterized in that transmitted for the purpose of updating the sleep mode connection ID. The method of claim 1, wherein the ranging request message And a sleep mode connection ID list in the form of a type length value (TLV).

Images