Method and arrangement to increase the data transmission flow rate in a communication system
View Patent ↗A method and apparatus to transfer data cells having an overhead section and a payload section via a communication medium from a transmitter to a receiver. Before transfer of a data cell, the overhead section of the data cell is translated into a shortened overhead section, known both on the transmitter and the receiver sides, and upon reception of the data cell, the shortened overhead section is translated again into the overhead section.
1. A method to transfer ATM data cells each having an overhead section and a payload section via a communication medium from a transmitter to a receiver, comprising:
before transfer of a data cell, translating an overhead section of said data cell into a shortened overhead section, known both on a transmission side and a reception side, and upon reception of said data cell, translating said shortened overhead section into said overhead section,
during the transfer of data cells, monitoring the data cells to be transmitted for the occurrence of an idle cell having an empty payload, and
when an idle cell having an empty payload is to be transmitted, using the payload of said idle cell to transmit a couple of an overhead section and of a corresponding shortened overhead section.
2. The method according to claim 1 , wherein for translation of said overhead section into said shortened overhead section a table of overhead sections is maintained both in said transmission side and said reception side.
3. The method according to claim 2 , wherein if said overhead section is not stored in said table, said overhead section and an associated shortened overhead section are stored in a new entry of said table in both said transmission side and said reception side.
4. The method according to claim 3 , wherein if said table is full, said new entry replaces a least intensively used entry of said table in both said transmission side and said reception side.
5. The method according to claim 3 , wherein said new entry is communicated from said transmission side to said reception side via an update cell.
6. The method according to claim 5 , wherein said update cell is retransmitted from said transmitter to said receiver more than once.
7. The method according to claim 1 , wherein said data cell is an Asynchronous Transfer Mode cell, said overhead section is a header comprising five bytes and said shortened overhead section is a header comprising one byte.
8. The method according to claim 7 , wherein said shortened overhead section comprises five value bits and three cyclic redundancy bits.
9. The method according to claim 7 , wherein the transfer of data cells is operated through a digital subscriber line technology.
10. An apparatus configured to transfer ATM data cells each having an overhead section and a payload section via a communication medium from said apparatus to a receiver, comprising:
receiving means configured to receive a data cell; and
transmit means configured to transmit said data cell,
memory means, configured to store a table of overhead sections and associated shortened overhead sections,
update communication means, interconnected with said memory means and configured to communicate to said receiver each update of an entry in said table;
overhead translating means, coupled between said receiving means and said transmit means and interconnected with said memory means, said overhead translating means configured to translate, before transmission of said data cell, an overhead section of said data cell into a shortened overhead section, associated with said overhead section in said table;
monitoring means monitoring the data cells to be transmitted for the occurrence of an idle cell having an empty payload, and
said transmit means to transmit an update overhead section and an associated shortened overhead section through the payload of idle cells.
11. The apparatus according to claim 10 , further comprising means for replacing, when the table is full, a least intensively used entry of said table by a new entry.
12. The apparatus according to claim 11 , further comprising means to transmit said new entry to the receiver through an update cell.
13. The apparatus according to claim 12 , further comprising means to transmit more than once said update cell.
14. The apparatus according to claim 10 , wherein the apparatus uses asynchronous transfer mode (ATM) and digital subscriber line (DSL) technologies.
15. An apparatus for receiving transferred ATM data cells each having an overhead section and a payload section via a communication medium from a transmitter to said apparatus, comprising:
a reception means configured to receive a data cell; and
a transmit means configured to source said data cell,
a memory means, configured to store a table of overhead sections and associated shortened overhead sections,
an update means, interconnected with said memory means and configured to update an entry in said table based on information communicated to said apparatus by said transmitter;
an overhead translating means, coupled between said reception means and said transmit means and interconnected with said memory means, said overhead translating means configured to translate, upon reception of said data cell, a shortened overhead section of said data cell into an overhead section, associated with said shortened overhead section in said table; and
said reception means to receive an update overhead section and an associated shortened overhead section through idle cells;
wherein the data cells to be transmitted are monitored by the transmitter for the occurrence of an idle cell having an empty payload.
16. The apparatus according to claim 15 , further comprising means to receive an update cell communicating a new entry.
17. The apparatus according to claim 15 , wherein the apparatus uses ATM and the DSL technologies.