Patent ID: 6697331
Filing Date: 2004-02-24
Classification: H04L

Abstract:
A mobile telecommunications system comprising:a mobile user equipment unit; at least one node through which a packet switched data session is established between the user equipment until and a data network; wherein one of the node and the user equipment unit servers as a transmitter of segments of data packets and the other of the node and the user equipment unit serves as a receiver of the segments of data packets; and wherein the receiver, upon arrival of a segment which is sequenced to a first lost segment, detects loss of the first lost segment and, in response to the arrival and detection of the loss, sends a first acknowledgment message to the transmitter, and wherein if (1) the first lost segment is not received within a timed interval initiated in conjunction with detection of the loss of the loss of the first lost segment and (2) the receiver subsequently determines that a second lost segment has been lost during the timed interval, at expiration of the timed interval the receiver sends a second acknowledgment message to the transmitter, the second selective acknowledgment message indicating loss of both the first lost segment and the second lost segment.