Relay Capability Indication for Layer-2 Relay Selection
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Solution Overview
Problem
In D2D communication systems, there is a challenge in determining whether relay user equipment supports layer-2 relay functionality, leading to potential connection failures and resource wastage, especially when remote UE attempts to connect through relay devices that do not support layer-2 relay, resulting in access and data communication delays.
Innovation Solution
An indication method where user equipment receives messages from relay user equipment and network devices indicating support for layer-2 relay, using specific messages and configuration information to distinguish between layer-2 and layer-3 relay capabilities, thereby avoiding connection attempts with non-supporting devices and optimizing resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If remote UE attempts to connect through relay UE without knowing layer-2 relay support status, then connection establishment may proceed, but connection failures occur and resources are wasted
Solution Approach 1:
The patent applies preliminary action by having the relay UE send indication information about layer-2 relay support status before the remote UE attempts connection establishment. This allows the remote UE to know in advance whether the relay UE supports layer-2 relay, preventing futile connection attempts and resource wastage while ensuring connection reliability.
2Reliability
If remote UE tries multiple relay devices to find layer-2 relay support, then connection success may be achieved, but access delay increases
Solution Approach 1:
The patent eliminates the need for multiple connection attempts by providing layer-2 relay support indication information in advance through system information or relay UE signaling. This allows the remote UE to directly select and connect to a relay UE that supports layer-2 relay, achieving connection success while minimizing access delay.
3Ease of operation
If layer-3 relay mechanism is used, then connection can be established, but network visibility and control are lost
Solution Approach 1:
The patent segments the relay mechanism into two distinct types: layer-3 relay for basic connection establishment and layer-2 relay for enhanced network visibility and control. By providing indication information about layer-2 relay support, the system enables remote UE to select the appropriate relay type, achieving both ease of operation and network visibility where needed.
Data Source
AI summary
An indication method, including receiving, by first user equipment, a first message sent by second user equipment, where the first message includes information indicating that the second user equipment supports an evolved user equipment-to-network relay function, and receiving, by the first user equipment, a second message sent by a network device, where the second message includes information indicating that the network device supports an evolved user equipment-to-network relay, or the second message includes information indicating that a cell in which the network device sends the second message supports an evolved user equipment-to-network relay.