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| author | Vadim Yanitskiy <axilirator@gmail.com> | 2019-06-22 23:33:29 +0700 |
|---|---|---|
| committer | Vadim Yanitskiy <axilirator@gmail.com> | 2019-07-01 20:05:48 +0700 |
| commit | af60c1bb10ad19be41e5eb54d067937f12c64470 (patch) | |
| tree | 0dc8e9edcd22435ec62793a0aa472e9b6b4cd4e3 /include | |
| parent | 851d35c675b0f7ebc6e72ec5692080d2fadb9125 (diff) | |
trx_toolkit/data_msg.py: implement header version coding
It may be necessary to extend the message specific header with
more information. Since this is not a TLV-based protocol, we
need to include the header format version.
+-----------------+------------------------+
| 7 6 5 4 3 2 1 0 | bit numbers |
+-----------------+------------------------+
| X X X X . . . . | header version (0..15) |
+-----------------+------------------------+
| . . . . . X X X | TDMA TN (0..7) |
+-----------------+------------------------+
| . . . . X . . . | RESERVED (0) |
+-----------------+------------------------+
Instead of prepending an additional byte, it was decided to use
4 MSB bits of the first octet, which used to be zero-initialized
due to the value range of TDMA TN. Therefore, the current header
format has implicit version 0x00.
Otherwise Wireshark (or trx_sniff.py) would need to guess the
header version, or alternatively follow the control channel
looking for the version setting command.
The reserved bit number 3 can be used in the future to extend
the TDMA TN range to (0..15), in case anybody would need
to transfer UMTS bursts.
Change-Id: Idb0377d66290eb9c15d6998a5806a84fa2e5dd02
Related: OS#4006
Diffstat (limited to 'include')
0 files changed, 0 insertions, 0 deletions