Multiplex communications – Pathfinding or routing – Switching a message which includes an address header
Reexamination Certificate
2005-09-13
2005-09-13
Ton, Dang (Department: 2666)
Multiplex communications
Pathfinding or routing
Switching a message which includes an address header
C370S395430, C370S902000, C370S474000
Reexamination Certificate
active
06944161
ABSTRACT:
In a communication system (SYS) circuit switched data frames (DF) are disassembled into ATM cells (CL), routed through an ATM routing network (RN) and cell data is reassembled into data frames (DF) by a frame assembly device (FAD). Second type cells including a pointer value (PTR) are normally included in the cell stream (CS) received from the ATM routing network (RN). This pointer value (PTR) indicates the delimitation position, i.e. the number of data units belonging to a current frame (DF) and to a next frame (DF′). In order to avoid a loss of data units of a complete frame when such a second type cell (STC) is lost during the transmission, the invention estimates the sequence number of the missing second type cell as well as the pointer value (PTR′). The pre-estimation of the pointer value (PTR′) can be done by continuously updating a respective counter assigned to a respective sequence number (SN) of a cell block (CB). Thus, instead of losing the complete data of a whole frame, due to lack of information of where the delimitation occurs, in accordance with the invention only the data units of the missing second type cell are replaced with dummy data units (AIS) in the data frame (DF, DF′).
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Duong Frank
Telefonaktiebolaget LM Ericsson (Publ)
Ton Dang
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