초록 ▼

If a handoff by a mobile station currently associated with a particular access point is probable, then the particular access point sends an activation alert to one or more other access points. An access point receiving the activation alert that is in a low-power state enters a higher-power state. An

If a handoff by a mobile station currently associated with a particular access point is probable, then the particular access point sends an activation alert to one or more other access points. An access point receiving the activation alert that is in a low-power state enters a higher-power state. An access point receiving the activation alert that is in a higher-power state, remains in that higher-power state.

대표청구항 ▼

1. A method for reducing handoff latency in a mesh wireless local area network, the method comprising: in anticipation of a probable handoff by a mobile station currently associated with a particular mesh access point in said network, sending an activation alert from said particular mesh access poin

1. A method for reducing handoff latency in a mesh wireless local area network, the method comprising: in anticipation of a probable handoff by a mobile station currently associated with a particular mesh access point in said network, sending an activation alert from said particular mesh access point to one or more other mesh access points in said network;determining at said particular mesh access point that a frame loss rate or packet loss rate exceeds a predetermined threshold, thus anticipating said probable handoff;if a receiving mesh access point of said one or more other mesh access points is in a low-power state upon receipt of said activation alert, entering a higher-power state in said receiving mesh access point upon receipt of said activation alert; andif said receiving mesh access point is not in said low-power state upon receipt of said activation alert, refraining from entering said low-power state in said receiving mesh access point upon receipt of said activation alert. 2. The method of claim 1, further comprising: maintaining said higher-power state in said receiving mesh access point for at least a predetermined period of time. 3. The method of claim 1, further comprising: after a period of time, determining at said particular mesh access point that said frame loss rate or packet loss rate has risen even further above said predetermined threshold; andsending another activation alert to said one or more other mesh access points in said network. 4. The method of claim 1, further comprising: if said particular mesh access point has received an indication that said mobile station has selected a certain mesh access point in said network as a target for handoff, having said particular mesh access point send a deactivation alert to one or more of said one or more other mesh access points other than said certain mesh access point. 5. The method of claim 1, further comprising: if said particular mesh access point has received an indication that said mobile station has selected a certain mesh access point in said network as a target for handoff, having said certain mesh access point send a deactivation alert to said one or more other mesh access points. 6. The method of claim 1, further comprising: if said particular mesh access point has received an indication that a certain mesh access point in said network has a lowest frame loss rate or packet loss rate sampled by said mobile station, sending another activation alert to said certain mesh access point. 7. The method of claim 1, further comprising: if said particular mesh access point has received an indication that said mobile station has selected a certain mesh access point in said network as a target for handoff, sending another activation alert to said certain mesh access point. 8. The method of claim 1, wherein said activation alert is relayed from said particular mesh access point to said receiving access point via a relay path that includes at least one relaying mesh point, the method further comprising: upon receipt of said activation alert by said relaying mesh point, entering a higher-power state in said relaying mesh point if said relaying mesh point is in a low-power state; andupon receipt of said activation alert by said relaying mesh point, refraining from entering said low-power state in said relaying mesh point if said relaying mesh point is not in said low-power state. 9. The method of claim 1, wherein said activation alert is relayed from said particular mesh access point to said receiving access point via a relay path that includes at least one relaying mesh access point, the method further comprising: upon receipt of said activation alert by said relaying mesh access point, entering a higher-power state in said relaying mesh access point if said relaying mesh access point is in said low-power state; andupon receipt of said activation alert by said relaying mesh access point, refraining from entering said low-power state in said relaying mesh access point if said relaying mesh access point is not in said low-power state. 10. A first wireless mesh access point comprising: a wireless communication interface;a processor coupled to said wireless communication interface; anda memory to store code which, when executed by said processor, results in said first wireless mesh access point sending an activation alert to one or more other mesh access points in a network to which said first wireless mesh access point belongs,wherein said activation alert, if received by a receiving mesh access point of said one or more other mesh access points in a low-power state upon receipt of said activation alert, results in said receiving mesh access point entering a higher-power state, and if received by said receiving mesh access point not in said low-power state upon receipt of said activation alert, results in said receiving mesh access point refraining from entering said low-power state,wherein said code, when executed by said processor, further results in:anticipating a probable handoff by a mobile station currently associated with said first wireless mesh access point;sending said activation alert to said one or more other mesh access points in response to anticipating said probable handoff; anddetermining that a frame loss rate or packet loss rate exceeds a predetermined threshold, thus anticipating said probable handoff. 11. The first wireless mesh access point of claim 10, further comprising: another communication interface, wherein said first wireless mesh access point is to send said activation alert by way of said other communication interface. 12. The first wireless mesh access point of claim 10, wherein said code, when executed by said processor, further results in: determining that said frame loss rate or packet loss rate has risen even further above said predetermined threshold; andsending another activation alert to said one or more other mesh access points. 13. The first wireless mesh access point of claim 12, wherein said code, when executed by said processor, further results in: if said first wireless mesh access point has received an indication that said mobile station has selected a certain mesh access point in said network as a target for handoff, sending a deactivation alert to said one or more other mesh access points other than said certain mesh access point. 14. The first wireless mesh access point of claim 12, wherein said code, when executed by said processor, further results in: if said first wireless mesh access point has received an indication that said mobile station has selected a certain mesh access point in said network as a target for handoff, sending another activation alert to said certain mesh access point. 15. The first wireless mesh access point of claim 12, wherein said code, when executed by said processor, further results in: if said first wireless mesh access point has received an indication that a certain mesh access point in said network has a lowest frame loss rate or packet loss rate sampled by said mobile station, sending another activation alert to said certain mesh access point. 16. A first wireless mesh access point comprising: a communication interface through which said first wireless mesh access point is able to receive an activation alert originating from a second mesh access point;a processor coupled to said communication interface; anda memory to store code which, when executed by said processor, if said first wireless mesh access point is in a low-power state upon receipt of said activation alert, results in said first wireless mesh access point entering a higher-power state upon receipt of said activation alert, and if said first wireless mesh access point is not in said low-power state upon receipt of said activation alert, results in said first wireless mesh access point refraining from entering said low-power state upon receipt of said activation alert,wherein the sending of the activation alert is in response to the second wireless mesh access point determining that a frame loss rate or packet loss rate for communications between said second wireless mesh access point and a mobile station associated with said second wireless mesh access point exceeds a predetermined threshold, thus anticipating a probable handoff by said mobile station. 17. The first wireless mesh access point of claim 16, wherein said first wireless mesh access point is to maintain said higher-power state for at least a predetermined period of time upon receipt of said activation alert.