Layer 2 tunneling of data during handover in a wireless communication system
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United States of America Patent
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May 7, 2013
Grant Date -
May 14, 2009
app pub date -
Aug 7, 2008
filing date -
Aug 8, 2007
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Techniques for sending data during handover with Layer 2 tunneling are described. In one design, a user equipment (UE) sends first Layer 2 packets to a source base station prior to handover to a target base station. The UE sends at least one second Layer 2 packet to the target base station, which identifies the second Layer 2 packet(s) as being intended for the source base station and thus forwards the second Layer 2 packet(s) to the source base station via a Layer 2 tunnel. The UE sends third Layer 2 packets to the target base station after the handover. The target base station processes the third Layer 2 packets to obtain IP packets and sends the IP packets to a serving gateway after a trigger condition, which may be defined to achieve in-order delivery of IP packets from the source and target base stations to the serving gateway.
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