Page 299 - 5G Basics - Core Network Aspects

Core network aspects 1

The related functional entities are shown in Figure 7-1.

Figure 7-1 – Functional entities associated with multi-path transmission

A multi-path transmission adjustment policy may include the following information:
– access network ID related to the specific service;
– data transmission rate of each path for a specific service.

7.2 Initialization of the mechanism

7.2.1 A multi-path transmission control initiated by MPT-enhanced MUE
For congestion control and retransmission path selection, it is required to collect the congestion signals and
network performance parameters. The signals and parameters are required to include, at least, the following
information:
– congestion control parameters of each path used for comprehensive path evaluation, such as
Cwnds, PLR, round-trip time (RTT) and slow start threshold (SSThresh);

– access type of each access network, which reflects the bandwidth, time delay, and reliability (i.e.,
QoS) level;
– total throughput and transmission rate of each sub-transmission flow.

In order to avoid or relieve congestion, the MPT-enhanced MUE can adjust the traffic according to specific
policies installed in the MPT-enhanced MUE; the various path adjustment algorithms are transparent to the
users.

7.2.2 A multi-path transmission control initiated by the network
It is required to collect the access network performance parameters and connection information and to
facilitate the adjustment policy decision by the multi-path transmission enhanced multi-connection policy
control function entity (MPT-enhanced MPC-FE). Afterwards, the updated policy can be sent to the multi-

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