RE: [rohc] ROHC context reuse & mode

["Lars-Erik Jonsson (LU/EAB)" <lars-erik.jonsson at ericsson.com>]

Kristofer,

> I think we should say in the implementer's guide
> something like:
>   "The decompressor must be able to detect when an
>    IR packet is used to reinitialize a context with
>    a different flow than the current flow in that
>    context. When such an IR packet is received, the
>    decompressor should start in its initial mode if
>    no mode parameter was included in the IR packet.
>    At this time, the decompressor may also discard
>    all information stored in the old context."

This looks ok, I'll add a new section on aspects of
"context re-use" and include this text. I think we
should also say something about the compressor, like:
  "When a ROHC compressor runs out of available 
   context identifiers or context memory resources,
   it can re-use an already established context and
   re-initialize it with IR for the new packet stream.
   The context must then be handled as a new context,
   which means compression must be carried out according
   to the initial mode of operation (U-mode)."

It is probably also useful to spell out what you said
in your previous mail. 
  "Exactly how a decompressor detects that a context
   is being re-initialized for a new flow is an
   implementation detail, but one possible approach
   could be to make a "diff" between all the STATIC-DEF
   fields of the new IR and the old context."

/L-E

-----------------------------------
Lars-Erik Jonsson, M.Sc
Wireless IP Optimizations
AWARE - Advanced Wireless Algorithm Research
Ericsson Research, Corporate Unit
Ericsson AB
Box 920, S-971 28 Luleå, Sweden
E-mail: lars-erik.jonsson@ericsson.com
Phone: +46 920 20 21 07
Fax: +46 920 20 20 99
Home: +46 920 999 57

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