Page 285 - 5G Basics - Core Network Aspects

Core network aspects 1

automatically, without any intervention. Her music service might not maintain the session during the two-
minute break.

Use Case 3: Traffic load dispersion access selection
Alice is at the airport and there are two APs serving the same SSID. At this time, AP1 was carrying 80 per cent
of the Wi-Fi traffic load, while AP2 was carrying only 20 per cent of the Wi-Fi traffic load. When Alice wants
to access the network, she is directed to AP2 through the network traffic load balancing capability.
Use Case 4: Battery-saving access selection

Alice is downloading an e-mail via Wi-Fi access. Suddenly, she receives a voice call from her boss via 3G
access. During her call, the e-mail download finishes. In order to save battery power, the Wi-Fi access is
automatically turned off.

6.2 Requirements

6.2.1 Access discovery requirement
As the mobile Internet increases in popularity, it is common to discover many different types of access
networks available at the same place, and it is important to solve the question of how to select the most
appropriate access for users. The following information types are required for access discovery:
1) connection capability of user equipment (UE) (multi-connection or single);
2) location of the UE;
3) current active access connections and services of the UE;
4) access network type (2G, 3G, long term evolution (LTE), Wi-Fi, worldwide interoperability for
microwave access (WiMAX));
5) traffic load and active connection state of the access network;
6) IP address type (IPv4, IPv6, dual-stack, private, public) the access network can provide;
7) charging (pricing) type of the access network;

8) signal strength of the access network;
9) authentication type of the access network;
10) QoS capability of the access network;
11) friendly partner list (for roaming);
12) Internet capability (personal, local, public).

6.2.2 Intelligent access selection requirement
Intelligent access selection is the ability to determine which access technologies, among multiple options, to
use based on the following considerations:
1) identify and/or update unavailable access connections and filter them out before displaying the
access list;
2) minimize user intervention when selecting accesses;
3) optimize network load and bandwidth efficiency;

4) encourage energy efficiency through power management;
5) satisfy certain policies after comparing parameters mentioned in access discovery requirement.

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