Page 295 - 5G Basics - Core Network Aspects

Core network aspects 1

3.2.2 multi-path transmission enhanced multi-connection policy control function entity: A multi-
connection policy control function entity [ITU-T Y.2027] with enhanced capabilities of multi-path
transmission control within the transport layer.
3.2.3 multi-path transmission enhanced multi-connection user equipment: A multi-connection user
equipment [ITU-T Y.2027] with enhanced capabilities of multi-path transmission control within the transport
layer.

3.2.4 multi-path transmission enhanced service control function: A service control function
[ITU-T Y.2027] with enhanced capabilities of multi-path transmission control within the transport layer.
3.2.5 path: The route taken by the multi-path transmission packets between two associated multi-path
transmissions enhanced multi-connection user equipment. If the user equipment is not enhanced with multi-
path transmission capability, the multi-path transmission enhanced service control function can be used as
a proxy. A path can be uniquely identified by the associated IP addresses and port number pairs.
3.2.6 sub-transmission flow: A unidirectional logical channel established from one multi-path
transmission enhanced multi-connection user equipment to another, which forms part of a larger multi-path
connection.

4 Abbreviations and acronyms
This Recommendation uses the following abbreviations and acronyms:

ACK Acknowledgement
Cwnd Congestion Window

ICV Integrity Check Value
MPC-FE Multi-connection Policy Control Function Entity
MPTCP Multi-Path TCP

MPT-enhanced MPC-FE Multi-Path Transmission enhanced Multi-connection Policy Control Function
Entity

MPT-enhanced MUE Multi-Path Transmission enhanced Multi-connection User Equipment
MPT-enhanced SCF Multi-Path Transmission enhanced Service Control Function

MUE Multi-connection User Equipment
PLR Packet Loss Rate

QoS Quality of Service
RTO Retransmission Timeout

RTT Round-Trip Time
SCF Service Control Function
SCTP Stream Control Transmission Protocol

SCTP-CMT Stream Control Transmission Protocol-Concurrent Multi-path Transfer
SSThresh Slow Start Threshold

UE User Equipment
WLAN Wireless Local Area Network

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