Section: 6.9.2.4 Relay UE Selection
Content: The 3GPP system shall support selection and reselection of relay UEs based on a combination of different criteria e.g. - the characteristics of the traffic that is intended to be relayed (e.g. expected message frequency and required QoS), - the subscriptions of relay UEs and remote UE, - the capabilities/capacity/coverage when using the relay UE, - the QoS that is achievable by selecting the relay UE, - the power consumption required by relay UE and remote UE, - the pre-paired relay UE, - the 3GPP or non-3GPP access the relay UE uses to connect to the network, - the 3GPP network the relay UE connects to (either directly or indirectly), - the overall optimization of the power consumption/performance of the 3GPP system, or - battery capabilities and battery lifetime of the relay UE and the remote UE. NOTE: Reselection may be triggered by any dynamic change in the selection criteria, e.g. by the battery of a relay UE getting depleted, a new relay capable UE getting in range, a remote UEs requesting additional resources or higher QoS, etc.