Re: [16NG] Re: traffic classification

Hi yw_chen,

yw_chen wrote:
> Dear All,
> 
> I am Yen-Wen Chen from Dept. of Communication Engineering, National 
> Central University, Taiwan. As I know that the classifier in 802.16 
> is applied to match the network layer traffic (e.g. IP packets or 
> IPv6 packets) into MAC flows of 802.16. Each MAC flow has a 
> connection ID (CID) and is associated with a specific forwarding 
> class (e.g. UGS, rtPS, nrtPS, ertPS, or best effort) and QoS-related 
> parameters (e.g. delay time, loss rate, etc.). The mapping rules does
>  not specify in the spec. and is decided in accordance with different
>  applications.

I believe when 802.16 spec says 'in accordance with different
applications' it means IP is one of those applications.

I think both the 802.16MAC implementation _and_ the IPv6 stack should
respect the same - unwritten - mapping rules.  Otherwise my IPv6 stack
on a vendor's 802.16MAC won't work on another vendor's.

> Packets with different IP Headers may be mapped to the same CID if
> those packets are with the same treatment in the link layer of
> 802.16.

I'm fine with that.

But does IPv6 DSCP AF11 '001010' (rfc2597) map into 'UGS' or into 'Best
Effort' forwarding class (802.16)?  Which one do you like more?  Which
one is implemented?

Alex
PS: 802.16 terms:  UGS - Unsolicited Grant Service
                  rtPS - real-time Polling Services
                 nrtPS - non-real-time Polling Services
                 ertPS - ??

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