Diese Präsentation wurde erfolgreich gemeldet.
Die SlideShare-Präsentation wird heruntergeladen. ×

L2_Wireshark.ppt

Anzeige
Anzeige
Anzeige
Anzeige
Anzeige
Anzeige
Anzeige
Anzeige
Anzeige
Anzeige
Anzeige
Anzeige
Wird geladen in …3
×

Hier ansehen

1 von 14 Anzeige
Anzeige

Weitere Verwandte Inhalte

Aktuellste (20)

Anzeige

L2_Wireshark.ppt

  1. 1. LTE L13 Protocols and Procedures Using Wireshark to view L2
  2. 2. © Ericsson AB 2013 | Using Wireshark to view L2 | LZU1089103 R2A | Figure 5-1 Wireshark Traces MME SGW/PGW eNodeB eNodeB NAS, S1AP, X2AP, GTP-C (GTP-v2) and GTP-U NAS, RRC, PDCP, RLC and MAC* *RBS MAC or RLC logs converted to pcap files
  3. 3. © Ericsson AB 2013 | Using Wireshark to view L2 | LZU1089103 R2A | Figure 5-2 RBS Trace File Conversion frame4Wireshark Pearl Script adds necessary information for Wireshark to decode the logs. Eg Whether a MAC-PDU is for a C-RNTI, SI-RNTI, RA-RNTI or P-RNTI Eg Whether a RLC-PDU is in AM, TM or UM. frame4Wireshark.pl text2pcap which is installed with Wireshark encapsulates MAC/RLC frames inside UDP so they can be read by Wireshark. text2pcap
  4. 4. © Ericsson AB 2013 | Using Wireshark to view L2 | LZU1089103 R2A | Figure 5-3 WireShark Settings Click to open
  5. 5. © Ericsson AB 2013 | Using Wireshark to view L2 | LZU1089103 R2A | Figure 5-4 MAC-LTE
  6. 6. © Ericsson AB 2013 | Using Wireshark to view L2 | LZU1089103 R2A | Figure 5-5 RLC-LTE
  7. 7. © Ericsson AB 2013 | Using Wireshark to view L2 | LZU1089103 R2A | Figure 5-6 PDCP-LTE
  8. 8. © Ericsson AB 2013 | Using Wireshark to view L2 | LZU1089103 R2A | Figure 5-7 PDCP Control PDU Format PDCP Control: ROHC feedback ... Interspersed ROHC feedback packet D/C PDU Type R R R R Oct 1 Oct 2 PDCP Control: STATUS Report ... Bitmap 1 (optional) D/C PDU Type BitmapN (optional ) FMS (cont.) FMS Oct 1 Oct 2 Oct 3 Oct 2+N D/C Data/Control FMS First Missing PDCP SN ROHC RObust Header Compression PDCP PDU on Wireshark Oct 1 Oct 2 Oct N Oct N-1 Oct N-2 Oct N-3 ... Data PDCP SN R R R MAC-I MAC-I (cont.) MAC-I (cont.) MAC-I (cont.) Can you find more examples?
  9. 9. © Ericsson AB 2013 | Using Wireshark to view L2 | LZU1089103 R2A | Figure 5-8 RLC Acknowledged Mode PDU SO SO LSF Oct 3 Oct 4 LI2 E LI2 (if K>=3) E LI1 LI1 D/C RF P FI E SN SN Data Oct N Oct 1 Oct 2 Oct 5 Oct 6 Oct 7 ... LIK-1 E LIK-1 E LIK-2 LIK-2 ... Padding E LIK LIK Oct [4.5+1.5*K] Oct [4.5+1.5*K-1] Oct [4.5+1.5*K-2] Oct [4.5+1.5*K-3] Oct [4.5+1.5*K-4] Oct [4.5+1.5*K+1] Present if K >= 3 SO SO LSF Oct 3 Oct 4 LI2 E LI2 E LI1 LI1 D/C RF P FI E SN SN Data Oct N Oct 1 Oct 2 Oct 5 Oct 6 Oct 7 ... LIK E LIK E LIK-1 LIK-1 Oct [4+1.5*K] ... Oct [4+1.5*K-1] Oct [4+1.5*K-2] Oct [4+1.5*K+1] D/C Data/Control E Extension Field FI Framing Info LSF Last Segment Flag P Poll Bit RF Resegmentation Flag SN Sequence Number SO Segment Offset RLC Data PDU on Wireshark Can you find more examples? D/C RF P FI E SN SN Data ... Oct 3 Oct N Oct 1 Oct 2
  10. 10. © Ericsson AB 2013 | Using Wireshark to view L2 | LZU1089103 R2A | Figure 5-9 STATUS PDU NACK_SN D/C CPT E1 ACK_SN ACK_SN Oct 1 Oct 2 NACK_SN E1 E2 NACK_SN NACK_SN SOstart SOstart SOend SOend E1 E2 SOend ... Oct 3 Oct 4 Oct 5 Oct 6 Oct 7 Oct 8 Oct 9 D/C Data/Control CPT Control PDU Type E Extension Field SO Segment Offset RLC Control PDU on Wireshark Can you find more examples? NACK_SN D/C CPT E1 ACK_SN ACK_SN Oct 1 Oct 2 NACK_SN E1 E2 NACK_SN NACK_SN SOstart SOstart SOend SOend E1 E2 SOend ... Oct 3 Oct 4 Oct 5 Oct 6 Oct 7 Oct 8 Oct 9
  11. 11. © Ericsson AB 2013 | Using Wireshark to view L2 | LZU1089103 R2A | Figure 5-10 MAC Sub-header LCID R F L R/R/E/LCID/F/L sub-header with 7-bits L field R/R/E/LCID/F/L sub-header with 15-bits L field R E LCID R F L R E L Oct 1 Oct 2 Oct 1 Oct 2 Oct 3 LCID R R/R/E/LCID sub-header R E Oct 1 MAC on Wireshark (1) Can you find more examples? 1 3 4 5 2 MAC header R/R/E/LCID/F/L sub-header R/R/E/LCID/F/L sub-header R/R/E/LCID/F/L sub-header R/R/E/LCID/F/L sub-header R/R/E/LCID/F/L sub-header 5 sub-headers
  12. 12. © Ericsson AB 2013 | Using Wireshark to view L2 | LZU1089103 R2A | Figure 5-11 MAC Control Elements Buffer Size LCG ID Oct 1 Buffer Size #0 Buffer Size #1 Buffer Size #1 Buffer Size #2 Buffer Size #2 Buffer Size #3 Oct 1 Oct 2 Oct 3 Short BSR Long BSR MAC on Wireshark (2) Can you find more examples? Power Headroom Short BSR
  13. 13. © Ericsson AB 2013 | Using Wireshark to view L2 | LZU1089103 R2A | Figure 5-12 Maintenance of Uplink Time Alignment › When the UE gets Timing - Random Access Response - Piggy Backed together with data Timing Advance Command R R Oct1 UE 2 UE 1 Timing Advance Notes MAC on Wireshark (3) How many bits? What is the change here? 6 NTA,new = NTA,old + (TA -31)x16 = NTA,old + (31 -31)x16 = NTA,old (no change)
  14. 14. © Ericsson AB 2013 | Using Wireshark to view L2 | LZU1089103 R2A | Figure 5-13

Hinweis der Redaktion

  • LTE L13 Protocols and Procedures
  • LTE L13 Protocols and Procedures
  • LTE L13 Protocols and Procedures

×