call 5/12/2015 notes
Folks,
Sorry for the delay. Anyway, quick telco notes below (I might have forgotten something already since my written down notes were extremely messy - cannot really read my own writing ;)
Start: 5/12/2015 6AM PDT
End: 5/12/2015 ~7AM PDT
Present:
Jouni Korhonen
Igor Freire
Raz Gabe
Richard Tse
Bomin Li
Peter Turnbull
Steinar Björnstad
Duncan Cockburb
Kevin Bross
Gareth Edwards
Satory Matsushima
Xhafer Krasniqi
Agenda:
* New RoE header strawman proposal
* RoE control channel
- basic assumptions / behavior
* Time reference planes
* First stab on the CPRI mapper
* AOB
Discussion:
* Jouni went through the draft materials he has been working for
The June FtF.
- Revised RoE header proposal (with start and end bits)
- TLV formats, control packets
- Time reference planes
- CPRI mapper strawman design (two versions; the simple one and more elaborate)
* Jouni also discussed about the timestamp behavior (presentation time) and how
that is calculated.
* Kevin brought up that is some cases we might want to have the actual time when the
RoE packet was sent (example MIMO etc when multicast distribution would be used).
This needs to be discussed in more detail to understand the pros/cons.
* Jouni also showed some illustrations how samples could be buffered and that way
get more one antenna carrier data put into one RoE packet.
* When packing samples into RoE frames we have not really discussed yet how
to handle padding e.g. in a case of 64B/66B encoding. The RoE packet content may
not align nicely in all cases.
* On CPRI mappers the "simple" version is basically a structure agnostic mapper with the
exception it understanding how to remove 8B/10B or 64B/66B encoding and also
mark start & end of the CPRI frame.
* The "better" CPRI mapper breaks the AxCs to separate flows, drops unused control
words & L1 protocol, and uses RoE Control messages to carry the control traffic
(including fast C&M).
* Before ending the call Jouni reminded about May 23 being the deadline for June
FtF meeting.
- Jouni
--
Jouni Korhonen, CTO Office, Networking, Broadcom Corporation
O: +1-408-922-8135, M: +1-408-391-7160