Patent ID: 7860992
Filing Date: 2010-12-28
Classification: H04L,H04W

Abstract:
1. An apparatus for transmitting data, the apparatus comprising: segmenting means for segmenting data into data frames; buffering means for buffering the data frames from the segmenting means; transmitting means, connected to the buffering means to receive buffered data frames therefrom, for transmitting the data frames; and controlling means for controlling the segmenting means, the controlling means being arranged to receive parameter data from the segmenting means pertaining to the segmented data frames and radio link resources data from the transmitting means pertaining to the transmission of data frames, to calculate a high watermark value and a low watermark value in response to the received parameter data and radio link resources data corresponding to maximal and minimal numbers of data frames to be buffered in the buffering means, and to control the segmenting means to maintain the number of data frames in the buffering means between the high and low watermark values, in which apparatus the controlling means is arranged to: receive from the segmenting means parameter data pertaining to a time-out value of a retransmission timer susceptible to delay and pertaining to the size of a largest data frame that may be passed to the transmitting means for transmission; calculate a transmit delay time using the time-out value; calculate a size of a largest frame to be transmitted from the size of the largest data frame that may be passed to the transmitting means for transmission; receive from the transmitting means radio link resources data including an allocated coding scheme and a number of allocated transmission slots for the buffered data frames to be transmitted; calculate a transmit rate from the allocated coding scheme and the number of allocated transmission slots; and determine the high watermark value using the calculated transmit delay time, the calculated size of the largest frame to be transmitted and the calculated transmit rate.