COMPRESSION METHOD FOR TDM FRAMES IN A PACKET NETWORK

摘要

There is provided a compression method for TDM frames transported over a packet network. The method is based on mapping of allocated TDM slots but not all un-allocated slots into a transport structure, which thereby reduces the needed amount of data transported over packets and hence reduces the required packet rate and packet capacity during transport of the TDM frame. The mapping is further arranged to allow dynamic changes of packet rate and packet capacity, thus the mapping is performed such that a working size of the transport TDM frame is allowed to increase or decrease over time. Further, mechanisms to lower experienced delay for low-rate signals are provided.

主权项

1. A method for node to node transfer of a TDM frame over packet transfer from a transmitting node to a receiving node, said method comprising:
in said transmitting node
identifying ranges of allocated and unallocated slots in said TDM frame;determining an initial working size of said TDM frame; andmapping said allocated slots and a subset of said identified ranges of unallocated slots to a transport TDM frame according to a mapping configuration; wherein said mapping is performed such that a working size of the transport TDM frame is allowed to increase or decrease over time.