Subject: RE: [rohc] Puzzle about RFC3095 CID be filled in PDCP PDU header

From: "Ghyslain Pelletier (LU/EAB)" <[email-masked]>
Date: Mon, 5 Dec 2005 10:20:04 +0100

Hi,

My understanding is alternative 2> -- all CID octets disappear -- as you describe it. I.e. "If the PDCP is configured by upper layers to use this method, the ROHC packet format is modified from its definition from RFC3095 to not include any CID octet".

Regards,

Ghyslain 

> -----Original Message-----
> From: [email-masked] [mailto:[email-masked]] On 
> Behalf Of LI_JING
> Sent: den 5 december 2005 05:06
> To: rohc
> Subject: [rohc] Puzzle about RFC3095 CID be filled in PDCP PDU header
> 
> Dear experts,
> 　　　　　　　　
> 　　  In   3GPP TS 25.323.450, description in
>      5.1.3.2        Mapping of PID values for RFC 3095 with 
> CIDs in PDCP PDU Header
>  
>     " If this method is configured by upper layers, PDCP 
> shall not introduce CIDs in the ROHC packet format."　
>  
>      Because  ROHC packet has following fixed frame format, 
> +---+--- --- --- +--- --- --------+
> :              Add-CID octet           :                   if 
> (CID 1-15) and (small CIDs)
> +---+--- --- --- +--- --- --------+
> | type indication   |     body           |                1 
> octet (8-x bits of body)
> +---+--- ---+---+---+--- --- ---+
> : :
> /     0, 1, or 2 octets of CID          /              1 or 2 
> octets if (large CIDs)
> : :
> +---+---+---+---+---+---+---+---+
> /              body                               /           
>    variable length
> +---+---+---+---+---+---+---+---+
>  
> which kind of following understanding is reasonable ?
>    1> "PDCP shall not introduce CIDs in the ROHC packet 
> format",so all CID octets in ROHC be set to 0 or be filled 
> with padding bits;
>     2> or all CID octets disappear; and  ROHC packet format changed.
>  
>     In my mind,  it would cause mess if we change ROHC packet 
> format  just because we get no need to fill effective CID in it.
>  
>    How about your ideas ?　　　　　　　　
> 　　　　　　　　　　　　　　　　
> BR
> LI JING
> TEL: (+86)029-87916666-6075
> Mail: [email-masked]
> ****************************************************************
> This e-mail and its attachments contain confidential 
> information from DATANG MOBILE, which is intended only for 
> the person or entity whose address is listed above. Any use 
> of the information contained herein in any way (including, 
> but not limited to, total or partial  disclosure, 
> reproduction, or dissemination) by persons other than the 
> intended recipient(s) is prohibited. If you receive this 
> e-mail in error, please notify the sender by phone or email 
> immediately and delete it!  Thank you.
> *****************************************************************
> 

_______________________________________________
Rohc mailing list
[email-masked]
https://www1.ietf.org/mailman/listinfo/rohc