As per Maximum Operators in world there are 3 types of Cores Integrated
- NSA CORE- EPC
- SA CORE - NGC
- SA + NSA CORE-Converged
ENDC offers 3 Deployment options
- Option 3
- Option 3a
- Option 3x “Wide Spread Deployed”
Let’s Explore ENDC Call Flow-LTE
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𝐕𝐞𝐫𝐢𝐟𝐢𝐜𝐚𝐭𝐢𝐨𝐧 𝐏𝐨𝐢𝐧𝐭𝟏 (Downlink): Enodeb Broadcast SIB-2
𝚄𝚙𝚙𝚎𝚛𝙻𝚊𝚢𝚎𝚛𝙸𝚗𝚏𝚘𝙸𝚗𝚍𝚒𝚌𝚊𝚝𝚒𝚘𝚗-𝚛𝟷𝟻 𝚝𝚛𝚞𝚎 -
𝐕𝐞𝐫𝐢𝐟𝐢𝐜𝐚𝐭𝐢𝐨𝐧 𝐏𝐨𝐢𝐧𝐭2 (Uplink): RRC Connection Setup Complete
[Attach Request +PDN Connecitivity Request] to ENB.
- 𝚞𝚎_𝚗𝚎𝚝𝚠𝚔_𝚌𝚊𝚙𝚊𝚋𝚒𝚕𝚒𝚝𝚢: 𝙳𝙲𝙽𝚁=𝟷
- 𝒖𝒆_𝒂𝒅𝒅_𝒔𝒆𝒄𝒖𝒓𝒊𝒕𝒚_𝒄𝒂𝒑
𝑬𝑨0 = 1 (0𝒙1)
128_𝑬𝑨1 = 1 (0𝒙1)
128_𝑬𝑨2 = 1 (0𝒙1)
128_𝑬𝑨3 = 1 (0𝒙1)
I𝑨0 = 0 (0𝒙0)
128_𝑰𝑨1 = 1 (0𝒙1)
128_I𝑨2 = 1 (0𝒙1)
128_𝑰𝑨3 = 1 (0𝒙1)
- 𝐕𝐞𝐫𝐢𝐟𝐢𝐜𝐚𝐭𝐢𝐨𝐧 𝐏𝐨𝐢𝐧𝐭3 (Uplink): UE Capability Information (EUTRA)
𝚒𝚛𝚊𝚝-𝙿𝚊𝚛𝚊𝚖𝚎𝚝𝚎𝚛𝚜𝙽𝚁-𝚛𝟷𝟻
𝚎𝚗-𝙳𝙲-𝚛𝟷𝟻 𝚜𝚞𝚙𝚙𝚘𝚛𝚝𝚎𝚍
𝚜𝚞𝚙𝚙𝚘𝚛𝚝𝚎𝚍𝙱𝚊𝚗𝚍𝙻𝚒𝚜𝚝𝙴𝙽-𝙳𝙲-𝚛𝟷𝟻
- 𝐕𝐞𝐫𝐢𝐟𝐢𝐜𝐚𝐭𝐢𝐨𝐧 𝐏𝐨𝐢𝐧𝐭4 (Uplink):UE Capability Information (EUTRA+NR)
𝚛𝚏-𝙿𝚊𝚛𝚊𝚖𝚎𝚝𝚎𝚛𝚜𝙼𝚁𝙳𝙲 {
𝚜𝚞𝚙𝚙𝚘𝚛𝚝𝚎𝚍𝙱𝚊𝚗𝚍𝙲𝚘𝚖𝚋𝚒𝚗𝚊𝚝𝚒𝚘𝚗𝙻𝚒𝚜𝚝
𝚋𝚊𝚗𝚍𝙻𝚒𝚜𝚝 𝚎𝚞𝚝𝚛𝚊
𝚋𝚊𝚗𝚍𝙴𝚄𝚃𝚁𝙰 𝚇,
𝚌𝚊-𝙱𝚊𝚗𝚍𝚠𝚒𝚍𝚝𝚑𝙲𝚕𝚊𝚜𝚜𝙳𝙻-𝙴𝚄𝚃𝚁𝙰 𝚊
𝚌𝚊-𝙱𝚊𝚗𝚍𝚠𝚒𝚍𝚝𝚑𝙲𝚕𝚊𝚜𝚜𝚄𝙻-𝙴𝚄𝚃𝚁𝙰 𝚊
𝚗𝚛 : 𝚋𝚊𝚗𝚍𝙽𝚁 𝚇𝚇,
𝚌𝚊-𝙱𝚊𝚗𝚍𝚠𝚒𝚍𝚝𝚑𝙲𝚕𝚊𝚜𝚜𝙳𝙻-𝙽𝚁 𝚌
𝚌𝚊-𝙱𝚊𝚗𝚍𝚠𝚒𝚍𝚝𝚑𝙲𝚕𝚊𝚜𝚜𝚄𝙻-𝙽𝚁 𝚊
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𝐕𝐞𝐫𝐢𝐟𝐢𝐜𝐚𝐭𝐢𝐨𝐧 𝐏𝐨𝐢𝐧𝐭5: Attach Accept
𝚁𝚎𝚜𝚝𝚛𝚒𝚌𝚝𝙳𝙲𝙽𝚁 = 𝟷 (𝟶𝚡𝟷) - 𝙽𝚘 𝙴𝙽𝙳𝙲 𝚂𝚞𝚙𝚙𝚘𝚛𝚝
𝚁𝚎𝚜𝚝𝚛𝚒𝚌𝚝𝙳𝙲𝙽𝚁 = 𝟶 - 𝙴𝙽𝙳𝙲 𝚂𝚞𝚙𝚙𝚘𝚛𝚝 -
𝐕𝐞𝐫𝐢𝐟𝐢𝐜𝐚𝐭𝐢𝐨𝐧 𝐏𝐨𝐢𝐧𝐭5: ENDC NR Measurement “RRC Connection Reconfiguration”
𝚖𝚎𝚊𝚜𝙲𝚘𝚗𝚏𝚒𝚐
𝚖𝚎𝚊𝚜𝙾𝚋𝚓𝚎𝚌𝚝𝚃𝚘𝙰𝚍𝚍𝙼𝚘𝚍𝙻𝚒𝚜𝚝
𝚖𝚎𝚊𝚜𝙾𝚋𝚓𝚎𝚌𝚝𝙸𝚍 𝟷,
𝚖𝚎𝚊𝚜𝙾𝚋𝚓𝚎𝚌𝚝𝙽𝚁-𝚛𝟷𝟻
𝚌𝚊𝚛𝚛𝚒𝚎𝚛𝙵𝚛𝚎𝚚-𝚛𝟷𝟻 𝚡𝚡𝚡𝚡𝚡𝚡𝚡,
𝚛𝚜-𝙲𝚘𝚗𝚏𝚒𝚐𝚂𝚂𝙱-𝚛𝟷𝟻
𝚖𝚎𝚊𝚜𝚃𝚒𝚖𝚒𝚗𝚐𝙲𝚘𝚗𝚏𝚒𝚐-𝚛𝟷𝟻
𝚙𝚎𝚛𝚒𝚘𝚍𝚒𝚌𝚒𝚝𝚢𝙰𝚗𝚍𝙾𝚏𝚏𝚜𝚎𝚝-𝚛𝟷𝟻 𝚜𝚏𝟸𝟶-𝚛𝟷𝟻 : 𝟻,
𝚜𝚜𝚋-𝙳𝚞𝚛𝚊𝚝𝚒𝚘𝚗-𝚛𝟷𝟻 𝚜𝚏𝟸
𝚜𝚞𝚋𝚌𝚊𝚛𝚛𝚒𝚎𝚛𝚂𝚙𝚊𝚌𝚒𝚗𝚐𝚂𝚂𝙱-𝚛𝟷𝟻 𝚔𝙷𝚣𝟷𝟸𝟶
𝚛𝚎𝚙𝚘𝚛𝚝𝙲𝚘𝚗𝚏𝚒𝚐𝙸𝚍 𝟷
𝚛𝚎𝚙𝚘𝚛𝚝𝙲𝚘𝚗𝚏𝚒𝚐𝙸𝚗𝚝𝚎𝚛𝚁𝙰𝚃 : 𝚝𝚛𝚒𝚐𝚐𝚎𝚛𝚃𝚢𝚙𝚎
𝚎𝚟𝚎𝚗𝚝 : 𝚎𝚟𝚎𝚗𝚝𝙸𝚍 𝚎𝚟𝚎𝚗𝚝𝙱𝟷-𝙽𝚁-𝚛𝟷𝟻
𝚋𝟷-𝚃𝚑𝚛𝚎𝚜𝚑𝚘𝚕𝚍𝙽𝚁-𝚛𝟷𝟻 𝚗𝚛-𝚁𝚂𝚁𝙿-𝚛𝟷𝟻 : 𝟽𝟻,
𝚛𝚎𝚙𝚘𝚛𝚝𝙾𝚗𝙻𝚎𝚊𝚟𝚎-𝚛𝟷𝟻 𝙵𝙰𝙻𝚂𝙴
𝚑𝚢𝚜𝚝𝚎𝚛𝚎𝚜𝚒𝚜 𝟸,
𝚝𝚒𝚖𝚎𝚃𝚘𝚃𝚛𝚒𝚐𝚐𝚎𝚛 𝚖𝚜𝟻𝟷𝟸
𝚖𝚊𝚡𝚁𝚎𝚙𝚘𝚛𝚝𝙲𝚎𝚕𝚕𝚜 𝟾,
𝚛𝚎𝚙𝚘𝚛𝚝𝙸𝚗𝚝𝚎𝚛𝚟𝚊𝚕 𝚖𝚜𝟹𝟸𝟶,
𝚛𝚎𝚙𝚘𝚛𝚝𝙰𝚖𝚘𝚞𝚗𝚝 𝚛𝟼𝟺
𝚖𝚎𝚊𝚜𝙸𝚍𝚃𝚘𝙰𝚍𝚍𝙼𝚘𝚍𝙻𝚒𝚜𝚝
𝚖𝚎𝚊𝚜𝙸𝚍 𝟷,
𝚖𝚎𝚊𝚜𝙾𝚋𝚓𝚎𝚌𝚝𝙸𝚍 𝟷,
𝚛𝚎𝚙𝚘𝚛𝚝𝙲𝚘𝚗𝚏𝚒𝚐𝙸𝚍 𝟷
- 𝐕𝐞𝐫𝐢𝐟𝐢𝐜𝐚𝐭𝐢𝐨𝐧 𝐏𝐨𝐢𝐧𝐭5: UE Search IRAT Neighbor based on Meas ID- 5g SSB part will be covered in next section
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