Power saving method for mobile terminal in wireless local area network
First Claim
1. A power saving method for a wireless local area network comprising a plurality of access points providing at least one mobile station in each access point cell with an access service, a mobile station transiting between an active mode and an idle mode, the method comprising the steps of:
- grouping the plurality of access points into at least one paging group with a paging group boundary;
determining if the mobile station is in the idle mode in which the mobile station switches between an awake state and a doze state every predetermined time interval, or in the active mode in which the mobile station is in the awake state;
if the mobile station is in the idle mode, activating an idle handoff, which occurs only when the mobile station moves across the paging group boundary, the idle handoff being performed in a media access control level; and
performing handoff operations related to an activation of an internet protocol layer after a successful completion of paging,wherein the idle handoff comprises a home access point of the mobile station transmitting, to a most recently associated access point of the mobile station, a page-notify message that initiates an access point receiving the page-notify message to page the mobile station, and the most recently associated access point transmitting the page-notify message to at least one access point in a paging group of the most recently associated access point.
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Accused Products
Abstract
The present invention relates to a power saving in a wireless local area network including a plurality of access points providing at least one mobile station in each access point cell boundary with access service, the mobile station transits between an active mode and an idle mode. The power saving method includes grouping the access points into at least one paging group with a paging group boundary; determining if the a mobile station is in the idle mode in which the mobile station switches between an awake state and a doze state every predetermined time interval, or the active mode in which the mobile station is in the awake mode; and if the mobile station is in the idle mode enabling an idle handoff which occurs only when the mobile station crosses the paging group boundary. In the present invention, the handoff occurs when the mobile terminal crosses the paging group boundary but not the access point cell in the idle mode, resulting in reduction of power consumption.
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Citations
20 Claims
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1. A power saving method for a wireless local area network comprising a plurality of access points providing at least one mobile station in each access point cell with an access service, a mobile station transiting between an active mode and an idle mode, the method comprising the steps of:
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grouping the plurality of access points into at least one paging group with a paging group boundary; determining if the mobile station is in the idle mode in which the mobile station switches between an awake state and a doze state every predetermined time interval, or in the active mode in which the mobile station is in the awake state; if the mobile station is in the idle mode, activating an idle handoff, which occurs only when the mobile station moves across the paging group boundary, the idle handoff being performed in a media access control level; and performing handoff operations related to an activation of an internet protocol layer after a successful completion of paging, wherein the idle handoff comprises a home access point of the mobile station transmitting, to a most recently associated access point of the mobile station, a page-notify message that initiates an access point receiving the page-notify message to page the mobile station, and the most recently associated access point transmitting the page-notify message to at least one access point in a paging group of the most recently associated access point. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A power saving method for a wireless communication system comprising a plurality of stationary stations providing at least one mobile station in each stationary station cell with an access service, a mobile station transiting between an active mode and an idle mode, the method comprises the steps of:
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grouping the plurality of stationary stations into at least one paging group with a paging group boundary; determining if the mobile station is in the idle mode or the active mode; if the mobile station is in the idle mode, performing a handoff only when the mobile station moves across the paging group boundary, the handoff being a media access control level handoff; and performing handoff operations related to an activation of an internet protocol layer after a successful completion of paging, wherein the idle handoff comprises a home access point of the mobile station transmitting, to a most recently associated access point of the mobile station, a page-notify message that initiates an access point receiving the page-notify message to page the mobile station, and the most recently associated access point transmitting the page-notify message to at least one access point in a paging group of the most recently associated access point. - View Dependent Claims (10, 11, 12, 13)
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14. A power saving method for a wireless communication system comprising a plurality of stationary stations providing at least one mobile station in each stationary station cell with an access service, a mobile station transiting between an active mode and an idle mode, the method comprising the steps of:
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grouping the plurality of stationary stations into at least one paging group with a paging group boundary; determining if the mobile station is in the idle mode or the active mode; if the mobile station is in the idle mode, performing a handoff when the mobile station moves across the paging group boundary, not across a boundary of the stationary station cell, the handoff being a media access control level handoff; and performing handoff operations related to an activation of an internet protocol layer after a successful completion of paging, wherein the idle handoff comprises a home access point of the mobile station transmitting, to a most recently associated access point of the mobile station, a page-notify message that initiates an access point receiving the page-notify message to page the mobile station, and the most recently associated access point transmitting the page-notify message to at least one access point in a paging group of the most recently associated access point wherein the idle handoff comprises a most recently associated access point of the mobile station requesting, to a home access point of the mobile station, a media access control address of the mobile station, receiving, from the home access point, the media access control address, and validating the mobile station based on the media control address. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification