Methods and apparatus for quickly exploiting a new link during hand-off in a wireless network
First Claim
1. A method of operating a first access router, the method comprising:
- increasing the transmission scheduling priority of packets in an existing packet flow directed towards a mobile node undergoing a hand-off from the first access router to a second access router, said increase in transmission scheduling priority being relative to packets directed to mobile nodes at the first access router which are not undergoing a hand-off;
communicating at least some packets from said existing packet flow over an existing downlink between the first access router and said mobile node following said increase in transmission scheduling priority; and
wherein said packets which are provided an increase in the transmission scheduling priority are a portion of all packets to be transmitted that are stored in the first access router when said mobile node commences hand-off.
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Accused Products
Abstract
A method to deliver traffic to a mobile node that is undergoing a hand-off between two Access Routers (AR) is described. The method of the present invention operates to perform the following. Decrease or minimize, delays between the time the old link breaks and the first packet is sent from the new link. Reduce or eliminate packet bursts from old to new Access Router (AR) when an old (existing) link breaks. Ensure that packets are neither lost nor duplicated during hand-off. Maintain Quality of Service (QoS) control of delivery order to the Mobile Node (MN). Make best use of multiple links during Make before break hand-off. Support both uplink and downlink traffic.
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Citations
28 Claims
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1. A method of operating a first access router, the method comprising:
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increasing the transmission scheduling priority of packets in an existing packet flow directed towards a mobile node undergoing a hand-off from the first access router to a second access router, said increase in transmission scheduling priority being relative to packets directed to mobile nodes at the first access router which are not undergoing a hand-off; communicating at least some packets from said existing packet flow over an existing downlink between the first access router and said mobile node following said increase in transmission scheduling priority; and wherein said packets which are provided an increase in the transmission scheduling priority are a portion of all packets to be transmitted that are stored in the first access router when said mobile node commences hand-off. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of operating a first access router, the method comprising:
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increasing the transmission probability of packets directed towards a mobile node undergoing a hand-off from the first access router to a second access router, said packets corresponding to a packet flow existing prior to initiation of said hand-off; communicating at least some of said packets over an existing downlink between the first access router and said mobile node following said increase in transmission probability; and wherein said packets for which the transmission probability is increased are a portion of all packets to be transmitted that are stored in the first access router when said mobile node commences hand-off. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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17. A first access router, comprising:
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means for increasing the transmission scheduling priority of packets in an existing packet flow directed towards a mobile node undergoing a hand-off from the first access router to a second, said increase in transmission scheduling priority being relative to packets directed to mobile nodes at the first access router which are not undergoing a hand-off; means for communicating at least some packets from said existing packet flow over an existing downlink between the first access router and said mobile node following said increase in transmission scheduling priority; and wherein said packets which are provided an increase in the transmission scheduling priority are a portion of all packets to be transmitted that are stored in the first access router when said mobile node commences hand-off. - View Dependent Claims (18, 19, 20, 21, 22)
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23. A first access router, comprising:
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means for increasing the transmission probability of packets directed towards a mobile node undergoing a hand-off from the first access router to a second access, said packets corresponding to a packet flow existing prior to initiation of said hand-off, said increase in priority being relative to packets of other mobile nodes not undergoing a hand-off; means for communicating at least some of said packets over an existing downlink between the first access router and said mobile node following said increase in transmission probability; and wherein said packets for which the transmission probability is increased are a portion of all packets to be transmitted that are stored in the first access router when said mobile node commences hand-off. - View Dependent Claims (24, 25, 26)
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27. A first access router, comprising:
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a scheduling module for increasing the transmission scheduling priority of packets in an existing packet flow directed towards a mobile node undergoing a hand-off from the first access router to a second access router, said increase in transmission scheduling priority being relative to packets directed to mobile nodes at the first access router which are not undergoing a hand-off; an interface for communicating at least some packets from said existing packet flow over an existing downlink between the first access router and said mobile node following said increase in transmission scheduling priority; and wherein said packets which are provided an increase in the transmission scheduling priority are a portion of all packets to be transmitted that are stored in the first access router when said mobile node commences hand-off. - View Dependent Claims (28)
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Specification