Patent ID: 9231874
Filing Date: 2016-01-05
CPC Classification: H04L,H04W

Claim Text:
1. A method in a network node for handling transmission control protocol, TCP, traffic in a packet switched network, the method comprising: receiving a first general packet radio service tunneling protocol user data tunneling (GTP-U) payload comprising a first TCP acknowledgement transmitted by a mobile node, wherein the first TCP acknowledgement comprises a header containing a first original advertised window size indicating an amount of data the mobile node is willing to receive, wherein the first original advertised window size is larger than an optimized advertised window size; determining that no TCP segment previously received within a certain amount of time has been dropped: as a result of determining that no TCP segment previously received within a certain amount of time has been dropped, refraining from modifying the first TCP acknowledgement and forwarding the first TCP acknowledgement towards a corresponding node in the packet switched network; receiving a second GTP-U payload comprising a second TCP acknowledgement transmitted by the mobile node, wherein the second TCP acknowledgement comprises a header containing a second original advertised window size indicating an amount of data the mobile node is willing to receive, wherein the second original advertised window size is larger than an optimized advertised window size; determining that at least one TCP segment previously received within a certain amount of time has been dropped; solely as a result of determining that at least one TCP segment previously received within a certain amount of time has been dropped, modifying the second TCP acknowledgement to create a modified TCP acknowledgement, wherein the step of modifying the second TCP acknowledgement comprises modifying the header of the second TCP acknowledgement such that the header of the second TCP acknowledgement contains the optimized advertised window size in place of the original advertised window size; and sending the modified TCP acknowledgement comprising the optimized advertised window size towards a correspondent node in the packet switched network.