Release 4 & Release 5
karthikbalaguru
I find that Release 4 and Release 5 of 3GPP support
both IPHC and ROHC. But which is popular in the
release 4 & release 5 ?
Further,
In GSM and IS-95,the 0-byte header compression
is used to completely eliminate the headers
for a majority of the packets during normal
operation and the functionalities available in
1-octet header scheme is available from the
lower layer functionalities.
In CDMA2000, I assume that the 'Header Removal'
might be applicable whenever the RTP/UDP/IP
information is not required at the UE/MS.
However, there are other options that are
available in CDMA 2000 -
1. ROHC
2. Link Layer Assisted Robust Header Compression
I understand that the limited bandwidth of
wireless links makes it impossible to transmit
the entire IP/UDP/RTP header with every packet
and So,arrived the ROHC mechanism that only
transmits the fields that change rather than
the entire header, but still maintain context
information.
To overcome the limitation of sending atleast
1 octet of header information in ROHC,there
is a feature that uses the synchronous
characteristics of physical channel layer to
replace the compressed header information.
But, which (ROHC or LLA ROHC) is widely
implemented and used in the following -
CDMA2000 1X(IS-2000) / 1xRTT
CDMA2000 EV-DO (Rev 0/A/B)
Any ideas ?
Thx in advans,
Karthik Balaguru