Method and apparatus for modification of connections in a communications system which is based on data compression
View Patent ↗The present invention relates to a method and apparatus for modification of a connection between a transmitting subscriber and a receiving subscriber in a communications system, which is based on data compression, within a switching center, with a data frame which arrives in the switching center and is formatted on the basis of a framing protocol being replaced independently of the length of the data frame by a new data frame formatted on the basis of the framing protocol, such that additional information can be fed into the connection without any loss of quality or time.
1. A method for modification of a connection between a transmitting subscriber and a receiving subscriber in a communications system, said connection being based on data compression, comprising:
receiving a data frame being formatted based on a framing protocol in a switching center, wherein said data frame arriving at the switching center arrives in a form segmented into multiple AAL2 packets; and
replacing said data frame within the switching center independently of a length of the data frame by a new data frame formatted based on the framing protocol to thereby feed additional information including a tone or an announcement into the connection without decoding based on TDM and subsequent back-coding based on ATM, wherein the new data frame is also segmented into multiple AAL2 packets said AAL2 packets each being provided with a packet header field.
2. The method as claimed in claim 1 ,
wherein said communications system based on data compression is an UMTS system.
3. The method as claimed in claim 2 , further comprising
using the packet header fields of the AAL2 packets to indicate the data frame with which a respective AAL2 packet should be associated.
4. The method as claimed in claim 2 ,
wherein the packet header fields of the AAL2 packets are each used to indicate whether subsequent AAL2 packets which are associated with a the same data frame will follow.
5. The method as claimed in claim 2 ,
wherein an end of the data frame of the connection to be modified is delayed before replacement begins, for which the data frames are not recreated from the AAL2 packets, and an end of a data frame is defined by evaluation of a respective packet header field.
6. The method as claimed in 2 ,
wherein the AAL2 packets are combined into ATM cells, which are specified for a receiving subscriber.