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Initial LTE call Setup Flow
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Initial LTE call Setup Flow

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Detail flow for LTE initial call Setup

Detail flow for LTE initial call Setup


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  • 1. Initial Call Setup UE eNB MME HSS RRC: Recv. SIB5 message in PBCH :RRC PHY: Start random access preamble :PHY and reconfigure Tx power . . . PHY: Recv. access indication in AICH :PHY RRC: connection request in RACH :RRC RRC: Connection setup request in RACH :RRC RRC: Connection Setup Complete in RACH :RRC S1-AP: Attach Request :S1-AP NAS: Identity Request :NAS NAS: Identity Response [GUTI / IMSI] :NAS NAS: Authenticatio Request :NAS NAS: Authenticatio Response :NAS S6a: Authentication request :S6a S6a: Authentication response :S6a S-GW P-GW
  • 2. Initial Call Setup UE eNB MME HSS S-GW P-GW NAS: Security Mode Command :NAS NAS: Security Mode Complete :NAS S6a: Update Location Request :S6a S6a: Update Location Answer :S6a S6a: Insert-Subscriber-Data-Request :S6a S6a: Insert-Subscriber-Data-Answer :S6a S11: Create Session Request : S11 S5: Create Session Request :S5 S11: Create Session Response :S11 Attach Accept S1AP: Initial Context Setup Request :S1AP Attach Accept RRC: Security Mode Command :RRC RRC: Security Mode Complete :RRC S5: Create Session Response :S5
  • 3. Initial Call Setup UE eNB HSS MME RRC: UE capability Enquiry :RRC RRC: UE capability Information :RRC S1AP: UE capability Information :S1AP RRC: RCC connection Reconfiguration :RRC RRC: RCC connection Reconfiguration Complete :RRC S1AP: Initial Context Setup Complete :S1AP S1AP: DL Info Transfer :S1AP DL Info Transfer UL Info Transfer Attach Complete S1AP: UL Info Transfer :S1AP Attach Complete S10: Modify Bearer Request :S10 S10: Modify Bearer Complete :S10 UL / DL Payload Data flow S-GW P-GW
  • 4. Thank You • Your suggestions and comments are always welcome. • Please send me your feedback at a_s_sinha@yahoo.com