Mention supported UDP framing format
Update Preferences Settings, mention calling RLC for known LCIDs 1&2.
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|* Can call RLC dissector for srb1 and srb2 (see Preference Settings below)|
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|* Dissect frames that have failed CRC check. Default is FALSE.|
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|* Attempt to dissect LCID 1&2 as srb 1&2. Default is FALSE.|
Medium Access Control (MAC) for LTE
This protocol is layer 2 of the LTE air interface (connecting an LTE UE with an eNodeB).
- MAC-LTE runs over the PHY layer
A UDP framing format for MAC-LTE has been defined (described in packet-mac-lte.h, purely for use with Wireshark)
- Can call RLC dissector for srb1 and srb2 (see Preference Settings below)
- BCH, PCH and CCCH payloads can be decoded by the LTE RRC dissector
RAR UL Grant field can be broken down according to 3GPP TS 36.213
The MAC-LTE dissector is fully functional. There is support for reading MAC-LTE frames from:
DCT2000 log files, or
MAC-LTE statistics can be viewed in a window (see Telephony | LTE MAC ...)
- Warn if reserved bits are not 0. This controls whether or not expert info should be displayed if reserved bits are non-zero. Default is TRUE.
- Number of Re-Transmits before expert warning triggered. Default is 3.
- Attempt to decode BCH, PCH and CCCH data using LTE RRC dissector. Default is TRUE.
- Attempt to decode details of RAR UL grant field (from breakdown in 3GPP TS 36.213, section 6.2). Default is TRUE.
- Dissect frames that have failed CRC check. Default is FALSE.
- Try Heuristic LTE-MAC framing over UDP. Default is FALSE.
Attempt to dissect LCID 1&2 as srb 1&2. Default is FALSE.
Example capture file
XXX - Add a simple example capture file to the SampleCaptures page and link from here (see below). Keep this file short, it's also a good idea to gzip it to make it even smaller, as Wireshark can open gzipped files automatically.
A complete list of MAC-LTE display filter fields can be found in the display filter reference
Show only the MAC-LTE based traffic:
You cannot directly filter MAC-LTE protocol frames while capturing. But, if you are using the supported UDP framing format, you may be able to filter on the UDP port you know that you are using, e.g.
udp port 9999
3GPP TS 36.321 Evolved Universal Terrestrial Radio Access (E-UTRA); Medium Access Control (MAC) protocol specification
3GPP TS 36.213 Evolved Universal Terrestrial Radio Access (E-UTRA); Physical layer procedures
Example program that generates and sends frames using the supported UDP framing format