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Content for
TR 38.806
Word version: 15.0.0
1…
2…
2
References
3
Definitions
4
General
5
Interface functions and procedures
6
CP-UP separation: scenarios and assessment results
7
CP-UP separation: solutions
8
Conclusions
$
Change History
2
References
p. 5
3
Definitions
p. 5
4
General
p. 5
5
Interface functions and procedures
p. 6
5.1
Introduction
p. 6
5.2
Interface Name
p. 6
5.3
Architecture
p. 6
5.4
E1 Interface General Principles
p. 7
5.5
E1 Interface Protocols and Protocol Structure
p. 7
5.6
E1 Interface Functions and Procedures
p. 8
5.6.1
Introduction
p. 8
5.6.2
Non-UE-associated E1 functions
p. 8
5.6.2.1
E1 interface management function
p. 8
5.6.3
UE-associated E1 functions
p. 8
5.6.3.1
Bearer management function
p. 8
5.6.4
Additional E1 functions
p. 8
5.7
Idle to Connected State Transition
p. 9
5.8
Xn Handover
p. 11
5.8.1
Introduction
p. 11
5.8.2
CU-CP Allocates UL TEID
p. 11
5.8.3
CU-UP Allocates UL TEID
p. 13
5.9
Secondary Node Addition
p. 14
5.10
Change of CU-UP
p. 16
5.11
Security handling
p. 17
5.11.1
General
p. 17
5.11.2
Considerations on CU-CP
p. 17
5.11.3
Considerations on CU-UP
p. 17
5.11.3.1
Key derivation
p. 17
5.11.3.2
PDCP count wrap around
p. 18
5.11.3.3
Counter checks
p. 18
6
CP-UP separation: scenarios and assessment results
p. 18
6.1
Introduction
p. 18
6.2
Scenarios
p. 18
6.2.1
Introduction
p. 18
6.2.2
Scenario 1: CU-CP and CU-UP centralized
p. 18
6.2.3
Scenario 2: CU-CP distributed and CU-UP centralized
p. 19
6.2.4
Scenario 3: CU-CP centralized and CU-UP distributed
p. 19
6.3
Benefits and drawbacks
p. 20
6.3.1
Introduction
p. 20
6.3.2
Scenario 1
p. 20
6.3.3
Scenario 2
p. 21
6.3.4
Scenario 3
p. 21
6.4
Conclusions for scenarios and benefits
p. 21
7
CP-UP separation: solutions
p. 21
8
Conclusions
p. 21
$
Change History
p. 22