METHOD FOR PERFORMING DEREGISTRATION WITH CONTENT RETENTION MODE IN BROADBAND WIRELESS ACCESS SYSTEM

• US 20120322491A1
• Filed: 01/07/2011
• Published: 12/20/2012
• Est. Priority Date: 01/07/2010
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Park, Gi Won, Kim, Yong Ho, Ryu, Ki Seon
• Granted Patent: US 9,155,059 B2
• Time in Patent Office: Days
• US Class Current: 455/517
• CPC Class Codes: H04W 36/0077 of access information of target access point
• CPC Class Codes: H04W 60/06 De-registration or detaching
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

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.

Claims

1. In a method of a mobile station for performing a Deregistration with Content Retention (DCR) mode respective to a request from a base station in a broadcast wireless access system, the method for performing the DCR mode comprises:

receiving a first broadcast message indicating an entry to the DCR mode from the base station;

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

receiving a third broadcast message including acknowledgement (ACK) information indicating whether or not the second message has been detected; and

in case the ACK information indicates a successful detection of the second message, entering the DCR mode.

2. The method of claim 1, wherein the first broadcast message comprises:

an identifier configured to identify the mobile station in the DCR mode and transmission opportunity offset information configured to indicate an uplink resource for transmitting the second message, and

wherein the ACK information is configured in a bitmap format, and

wherein the second message is transmitted through an uplink resource indicated by the transmission opportunity offset information.

3. The method of claim 2, further comprising:

in case the bit respective to the mobile station within the bitmap indicates that the detection of the second message has failed,

retransmitting the second message to the base station;

or

performing handover to another base station.

4. The method of claim 1, wherein the first broadcast message corresponds to a DCR advertisement (AAI_DCR-ADV) message having its Action code field assigned with a value indicating an entry to the DCR mode, and

wherein the third broadcast message corresponds to the DCR advertisement message having the Action code field assigned with a value indicating a response to the second message.

5. The method of claim 1, wherein, when the first broadcast message is transmitted along with a control extension header (MCEH) indicating a transmission of the second message, the second message corresponds to a message acknowledgement response (AAI_MSG-ACK) message or a Quick Access Message being transmitted along with a bandwidth request (BR) preamble sequence, and

wherein, when the first broadcast message is not accompanied with the control extension header, the second message corresponds to a deregistration request message having its deregistration request code assigned with a value of 0x04.

6. In a method of a mobile station for performing a Deregistration with Content Retention (DCR) mode respective to at least one mobile station by a base station in an unsolicited manner in a broadcast wireless access system, the method for performing the DCR mode comprises:

broadcasting a first broadcast message indicating an entry to the DCR mode;

receiving a second message requesting the DCR mode entry from the at least one mobile station; and

broadcasting a third broadcast message including acknowledgement (ACK) information indicating whether or not the at least one second message has been detected.

7. The method of claim 6, wherein the first broadcast message comprises:

an identifier configured to identify each of the at least one mobile station in the DCR mode and transmission opportunity offset information configured to indicate an uplink resource enabling each of the at least one mobile station to transmit the second message, and

wherein the ACK information is configured in a bitmap format, and

wherein the second message is received through an uplink resource indicated by the transmission opportunity offset information.

8. The method of claim 6, wherein the first broadcast message corresponds to a DCR advertisement (AAI_DCR-ADV) message having its Action code field assigned with a value indicating an entry to the DCR mode, and

wherein the third broadcast message corresponds to the DCR advertisement message having the Action code field assigned with a value indicating a response to the second message.

9. The method of claim 6, wherein the second message corresponds to a deregistration request (AAI_DREG-REQ) message having its deregistration request code assigned with a value of 0x04.

10. The method of claim 6, wherein, when the first broadcast message is transmitted along with a control extension header (MCEH) indicating a transmission of the second message, the second message corresponds to a message acknowledgement response (AAI_MSG-ACK) message or a Quick Access Message being transmitted along with a bandwidth request (BR) preamble sequence.

11. In a mobile station device performing a Deregistration with Content Retention (DCR mode) in a broadcast wireless access system, the mobile station device comprises:

a processor; and

a radio frequency (RF) (or wireless communication) module configured to transmit and receive radio signals to and from an external source based upon a control of the processor,

wherein the processor performs control operations;

so that the mobile station can first receive a first broadcast message indicating an entry to the DCR mode from the base station, transmit a second message requesting the DCR mode entry to the base station, then, receive a third broadcast message including acknowledgement (ACK) information indicating whether or not the second message has been detected, so as to enter the DCR mode, in case the ACK information indicates a successful detection of the second message.

12. The mobile station device of claim 11, wherein the first broadcast message comprises:

an identifier configured to identify the mobile station in the DCR mode and transmission opportunity offset information configured to indicate an uplink resource for transmitting the second message, and

wherein the ACK information is configured in a bitmap format, and

wherein the second message is transmitted through an uplink resource indicated by the transmission opportunity offset information.

13. The mobile station device of claim 12, wherein, in case the bit respective to the mobile station within the bitmap indicates that the detection of the second message has failed, the controller retransmits the second message to the base station;

or performs handover to another base station.

14. The mobile station device of claim 11, wherein the first broadcast message corresponds to a DCR advertisement (AAI_DCR-ADV) message having its Action code field assigned with a value indicating an entry to the DCR mode, and

wherein the third broadcast message corresponds to the DCR advertisement message having the Action code field assigned with a value indicating a response to the second message.

15. The mobile station device of claim 11, wherein, when the first broadcast message is transmitted along with a control extension header (MCEH) indicating a transmission of the second message, the second message corresponds to a message acknowledgement response (AAI_MSG-ACK) message or a Quick Access Message being transmitted along with a bandwidth request (BR) preamble sequence, and wherein, when the first broadcast message is not accompanied with the control extension header, the second message corresponds to a deregistration request message having its deregistration request code assigned with a value of 0x04.