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Revision 5 as of 2009-02-26 13:51:59
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Comment: Add stats screenshot
Revision 6 as of 2009-04-27 15:53:01
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Comment: Update preferences
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 * 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
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 * Expect single RAR bodies. This controls whether or not a full MAC PDU will be present for an RA-RNTI, or just a single RAR body. Default is FALSE.
 * 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 currently TRUE.
 * 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.
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 * [[http://www.3gpp.org/ftp/Specs/html-info/36213.htm|3GPP TS 36.213]] Evolved Universal Terrestrial Radio Access (E-UTRA); Physical layer procedures

Medium Access Control (MAC) for LTE

This protocol is layer 2 of the LTE air interface (connecting an LTE UE with an eNodeB).

Protocol dependencies

  • MAC-LTE runs over the PHY layer
  • 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

Example traffic

mac-lte1.png

Wireshark

The MAC-LTE dissector is fully functional. However, at the moment there is only support for the DCT2000 file format.

MAC-LTE statistics can be viewed in a window (see Telephony | LTE MAC ...)

mac-lte-stats.png

Preference Settings

  • 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.

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.

Display Filter

A complete list of MAC-LTE display filter fields can be found in the display filter reference

  • Show only the MAC-LTE based traffic:

     mac-lte 

Capture Filter

You cannot directly filter MAC-LTE protocol frames while capturing.

  • 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

Discussion

MAC-LTE (last edited 2015-11-26 14:50:17 by PascalQuantin)