Method and system for converting data
The invention relates to a data conversion method whereby a packet-based data transfer is converted into a data transfer which is synchrronised in time slots, and packets are stored in a conversion buffer memory ( 3 ). According to the invention, a packet is rejected at the end of a time interval (Tx) if, during the time interval Tx, the number of data packets never falls below a threshold value t>0 in the conversion buffer memory ( 3 ). The invention also relates to a data conversion system.
1 . A data conversion method, comprising:
converting data transfer based on data packets into data transfer which is synchronized in timeslots;
storing the data packets in a conversion buffer memory; and
discarding a data packet at the end of a time interval Tx if a number of the data packets in the conversion buffer memory does not fall below a threshold value t>0 during the time interval Tx.
2 . The method in accordance with claim 1 , wherein
a transmission delay reduced by at least a time interval Tq occurs during conversion if the data packet is discarded during conversion.
3 . The method in accordance with claim 1 , wherein
when a quantity of data packets t=1, the data packet is discarded if at least one data packet is present in the conversion buffer memory during the time interval Tx.
4 . The method in accordance with claim 1 , wherein
the threshold value t is made greater than or equal to two if two consecutive data packets arrive which belong together and/or one data packet is useless without the other.
5 . The method in accordance with claim 4 , wherein
the two data packets are discarded if the number of data packets in the conversion buffer memory does not falls below the threshold value t which is greater than or equal to two during the time interval Tx.
6 . The method in accordance with claim 1 , wherein
the data transfer based on data packets is effected according to a Asynchronous Transfer Mode Adaptation Layer Type 2 standard.
7 . The method in accordance with claim 1 , wherein
the transfer which is synchronized in the timeslots is effected according to a timeslot multiplexing method.
8 . The method in accordance with claim 1 , wherein
the data involves voice data.
9 . The method in accordance with claim 1 , wherein
the data packets involve Common Part Sub-Layer packets.
10 . A data conversion system for converting data transfer based on data packets into data transfer which is synchronized in timeslots, comprising:
a conversion device; and
a conversion buffer memory for storing data packets for discarding a data packet at an end of a time interval Tx when a number of the data packets in the conversion buffer memory not falling below a threshold value t>0 during the time interval Tx.
11 . The system in accordance with claim 10 , wherein
the system displays a control device for controlling the discarding of a data packet.
12 . The system in accordance with claim 10 , wherein
a transmission delay reduced by at least a time interval Tq occurs during conversion when a data packet is discarded.
13 . The system in accordance with claim 10 , wherein the discarding of the data packet when a quantity of the data packets t=1, if at least one data packet is present in the conversion buffer memory during the time interval Tx.
14 . The system in accordance with claim 10 , wherein
the threshold value t is greater than or equal to two if two consecutive data packets arrive which belong together and/or one data packet is useless without the other.
15 . The system in accordance with claim 14 , wherein the discarding of two data packets if a number of data packets in the conversion buffer memory does not fall below the threshold value t which is greater than or equal to two during the time interval Tx.
16 . The system in accordance with claim 10 , wherein
the data transfer based on packets is effected according to an Asynchronous Transfer Mode Adaptation Layer Type 2 standard.
17 . The system in accordance with claim 10 , wherein
the transfer which is synchronized in timeslots is effected according to a timeslot multiplexing method.
18 . The system in accordance with claim 10 , wherein
the data involves voice data.
19 . The system in accordance with claim 10 , wherein
the data packets involve Common Part Sub-Layer packets.