[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [rohc] Implementation parameters and signals
For ROHC, multiplexing on link-layer will be like having multiple channels. That
is probably what Micke talked about. ROHC is designed for the case with multiple
channels and the CID space in ROHC is possible to set to a value 0 for this if
only one packet stream is sent over each channel. This would also be the case if
you have "CID" on the link layer and a ROHC-over-X document should define how
that would be implemented.
/L-E
>-jk- Bits as channel identifiers? The actual channels in WCDMA are separated
>by other identifiers so these 5 bits are not needed for that purpose. What I
>originally tried to propose is that ROHC would provide compressed header +
>associated CID (CID not part of the compressed header). By having such
>possibility the logical layered architecture could be maintained (in 3GPP).
>By having the CID separate as an output from ROHC we would be able to get
>rid of 1 octect overhead in ROHC (in case CID can be provided by link) and
>be able to feed in several flows to ROHC but get them out as separate. I try
>to illustrate it in the figure below.
>
>-------------------------------------------------
>PDCP | n flows into ROHC
> V
> -------------------------
> | ROHC |
> | |
> -------------------------
> | | | | 1. Flow 1 'logical CID' 0
> v v v v 2. Flow 2 'logical CID' 1
> 1. 2. 3. 4. 3. Flow 3 'logical CID' 2
> 4. Flow n 'logical CID' n-1
>
> Put compressed headers (+payload)
> to PDCP PDU and copy 'logical CID'
> to PDCP header (those 5 bits)
>
> |
> | all flows travel over same radio bearer
> v
>---------------------------------------------------
>RLC
>
>Any clearer or did I misunderstood something in first place?
>
>-jk-
>
>> >> >---
>> >> >Mailing list for Robust Header Compression WG
>> >> >Archive: http://www.cdt.luth.se/rohc/
>> >> >
>> >>
>> >
>>
>---
>Mailing list for Robust Header Compression WG
>Archive: http://www.cdt.luth.se/rohc/