METHODS AND DEVICE FOR PROCESSING DIGITAL DATA FRAMES AND TRANSPORT FRAMES FOR REDUCTION OF TRANSPORT BANDWIDTH

• US 20150207740A1
• Filed: 06/07/2013
• Published: 07/23/2015
• Est. Priority Date: 07/09/2012
• Status: Active Grant

• Current Assignee: Alcatel-Lucent SA (Nokia Corporation)
• Original Assignee: Alcatel-Lucent SA (Nokia Corporation)
• Inventors: Jamond, Jean-Francois, Froger, Emmanuel, Klein, Olivier, Thomann, Olivier
• Granted Patent: US 9,674,089 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04B 10/27 Arrangements for networking
• CPC Class Codes: H04J 3/1652 Optical Transport Network [OTN]
• CPC Class Codes: H04L 47/12 Avoiding congestion; Recovering from congestion
• CPC Class Codes: H04L 69/04 Protocols for data compression, e.g. ROHC

Abstract

A device (D1) is intended for processing digital data frames to be transmitted by a transport network (TN), and comprises i) a first processing means (PM1) comprising ports for receiving digital data frames and arranged for downsizing, then compressing, if necessary, and then compacting each one of these received digital data frames to produce reduced digital data frames, ii) a second processing means (PM2) arranged for aggregating at least some of these reduced digital data frames together according to aggregation information to produce frame groups, and iii) a third processing means (PM3) arranged for grouping these frame groups together with a group descriptor, defining initial arrangements of the digital data frames, according to grouping information, to produce a transport frame to be transmitted by the transport network (TN).

Claims

1. Method for processing digital data frames to be transmitted by a transport network, said method comprising digital data frames being downsized, then compressed if necessary and then compacted to produce reduced digital data frames, at least some of said reduced digital data frames being aggregated together according to aggregation information to produce frame groups, and said frame groups being grouped together with a group descriptor, defining initial arrangements of said digital data frames, according to grouping information, to produce a transport frame to be transmitted by said transport network.

2. Method according to claim 1, wherein said downsizing comprises reducing the line coding overhead of each digital data frame, while keeping errors of transmission.

3. Method according to claim 1, wherein said optional compression comprises scaling blocks of samples by a scaling factor and quantising said scaled blocks of samples to produce compressed samples.

4. Method according to claim 1, wherein said compacting comprises clearing from unused data bytes each one of said digital data frames.

5. Method according to claim 1, wherein, in case where said digital data frames have been encoded according to a 8B/10B line coding, one transforms each one of said digital data frames into a couple of 8 data bits plus 2 control bits.

6. Method according to claim 1, wherein one applies a 64B/65B encoding to data containers contained into said frame groups before aggregating them into said transport frame.

7. Method according to claim 1, wherein said digital data frames are common public radio interface data frames.

8. Method according to claim 1, wherein said transport frame is an optical data unit configured for transport by an optical transport network.

9. Method for processing a transport frame transmitted by a transport network, said method comprising, after having received a transport frame produced by a method according to claim 1, one de-groups frame groups it comprises, one de-aggregates each of said frame groups to get reduced digital data frames they comprise, and one un-compacts, then de-compresses if compressed, and then upsizes each one of said reduced digital data frames according to information contained into a group descriptor of said transport frame to get digital data frames.

10. Method according to claim 9, wherein, in case where said de-grouped frame groups contain data containers encoded by means of a 64B/65B encoding, one applies a 64B/65B decoding to said data containers.

11. Method according to claim 9, wherein, in case where said digital data frames are 8+2B digital data frames, one transforms them into 8B/10B digital data frames after having de-compressed them.

12. Method according to claim 9, wherein said transport frame is an optical data unit transported by an optical transport network.

13. Method according to claim 9, wherein said digital data frames are common public radio interface data frames.

14. Device for processing digital data frames to be transmitted by a transport network, said processing device comprising a first processing means comprising ports for receiving digital data frames and arranged for downsizing, then compressing, if needed, and then compacting said received digital data frames to produce reduced digital data frames, a second processing means arranged for aggregating at least some of said reduced digital data frames together according to aggregation information to produce frame groups, and a third processing means arranged for grouping said frame groups together with a group descriptor, defining initial arrangements of said digital data frames, according to grouping information, to produce a transport frame to be transmitted by said transport network.

15. Device according to claim 14, wherein said third processing means is arranged, after having received a transport frame, for de-grouping the frame groups it comprises, said second processing means is arranged for de-aggregating each of said frame groups to get reduced digital data frames they comprise, and said first processing means is arranged for un-compacting, then de-compressing, and then un-downsizing each one of said reduced digital data frames according to information contained into the group descriptor of said transport frame to get digital data frames.