Relay UE Small Data Transmission via PC5 Discovery
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Solution Overview
Problem
Current mobile communication systems face challenges in efficiently managing high data traffic, increasing transfer rates, accommodating numerous connection devices, achieving low latency, and optimizing energy efficiency, particularly in supporting small data transmissions through relay user equipment (UE) in wireless communication systems.
Innovation Solution
A method for transmitting and receiving small data through a relay UE using a PC5 interface, involving a discovery procedure to verify the relay UE's ability to transmit data, and utilizing a PC5 message with a small data transmission indicator to facilitate efficient data transfer, even in low-power, low-rate, and low-complexity devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If relay UE is used to transmit small data for remote UE, then power consumption of remote UE is reduced, but device complexity increases due to discovery procedure and verification mechanisms
Solution Approach 1:
The patent performs a discovery procedure in advance to identify relay UEs that support small data transmission before actual data transfer. The remote UE verifies relay capabilities through PC5 discovery messages and small data transmission indicators, establishing a ready-to-use relay path that avoids power-consuming direct network access during data transmission phases.
Solution Approach 2:
The patent introduces relay UE as an intermediary between remote UE and the network for small data transmission. The relay UE receives small data from remote UE via PC5 interface and forwards it to the network, allowing remote UE to offload transmission tasks and reduce power consumption while maintaining network connectivity through the intermediary relay node.
2Reliability
If discovery procedure is performed to verify relay UE capability, then reliability of small data transmission is improved, but transmission time is increased
Solution Approach 1:
The discovery procedure and capability verification are performed in advance before small data transmission begins. Remote UE identifies relay UEs with appropriate capabilities through PC5 discovery messages and verification of small data transmission indicators, so that when small data needs to be transmitted, the reliable relay path is already established and ready for immediate use.
Solution Approach 2:
The patent changes the state of relay UE from unknown to verified capable through the discovery procedure. By checking specific parameters in PC5 discovery messages (small data transmission indicators), the system transforms unverified relay nodes into confirmed reliable transmission paths, ensuring reliability while minimizing ongoing verification overhead.
3Productivity
If relay UE supports small data transmitting procedure is verified, then data transmission efficiency is improved, but complexity of communication protocol increases
Solution Approach 1:
The patent extracts the small data transmission capability verification from the general relay selection process. By specifically checking for small data transmission indicators in PC5 discovery messages and separating this verification step from other relay discovery procedures, the system improves efficiency for small data transmissions while keeping the additional protocol complexity isolated and manageable.
Solution Approach 2:
The patent makes the relay UE discovery mechanism multi-functional by incorporating small data transmission capability verification into the existing PC5 discovery procedure. The same discovery messages used for general relay selection also carry small data transmission indicators, allowing a single protocol mechanism to serve both general relay discovery and specific small data transmission verification purposes.
Data Source
AI summary
Disclosed are a method for transmitting and receiving data through a relay in a wireless communication system and an apparatus therefor. Specifically, a method for transmitting and receiving, by a remote user equipment (UE), data to and from a network through a relay UE in a wireless communication system includes: recognizing that small data to be transmitted to the network is generated; performing a discovery procedure through the relay UE and a PC5 interface; and transmitting a PC5 message including the small data to the relay UE when it is verified that the relay UE has an ability to transmit the small data to the network in the discovery procedure, in which when it is indicated that the relay UE supports a small data transmitting procedure by a PC5 discovery message received from the relay UE in the discovery procedure, it may be determined that the relay UE has the ability to transmit the small data to the network.