U2N Relay Fallback to Emergency Service Networks
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Solution Overview
Problem
Current U2N relay standards do not provide a mechanism for fallback and handover to an E-UTRAN or 5G network that supports emergency services, limiting communication capabilities in networks that do not initially support these services.
Innovation Solution
A terminal device equipped with a communication unit and protocol processing unit that facilitates relaying and handover to a network capable of supporting emergency services, even if the initial network does not, by utilizing a U2N relay to perform fallback operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a U2N relay is used to extend cell coverage, then communication coverage is improved, but the ability to provide emergency services is lost when the network does not support emergency services
Solution Approach 1:
The relay device dynamically switches between relaying normal communication traffic and relaying emergency service traffic based on the type of service request received. When an emergency service request is detected, the device transitions to a mode that prioritizes establishing a connection to a network supporting emergency services, thereby adapting its behavior to maintain emergency service availability while extending coverage.
Solution Approach 2:
The relay device acts as an intermediary between UEs requiring emergency services and networks that support emergency services. It receives service requests from UEs, determines whether the current network supports emergency services, and if not, facilitates handover to a suitable network, thus mediating the connection to ensure emergency service availability is maintained.
2Reliability
If fallback to another network is implemented for emergency services, then emergency service availability is improved, but network complexity increases
Solution Approach 1:
The relay device autonomously determines whether the current network supports emergency services by analyzing service requests and network responses without requiring complex external control mechanisms. It self-manages the handover process to networks supporting emergency services, reducing the need for additional complexity in network coordination and control infrastructure.
Data Source
Figure 1
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Figure 4
AI summary
A relay device (110#) includes: a terminal-side communication unit (111#) that relays communication of a UE (110) to a first network that is unable to use an emergency service but supports the fallback of the emergency service, or a second network to which the emergency service falls back; and a protocol processing unit (113#) that hands over the communication of the UE (110) to the second network when a request to connect to the emergency service is received from the UE (110) while the communication of the UE (110) is being relayed to the first network.