Relay UE Discovery via D2D Link in Wireless Communication
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Solution Overview
Problem
In wireless communication systems, existing technologies face challenges in efficiently discovering relay user equipment (UE) via device-to-device (D2D) links, particularly in scenarios where UEs are in different cells, leading to difficulties in establishing effective communication paths.
Innovation Solution
A method and apparatus for communicating via a relay UE in a wireless communication system, where a UE receives information on the identifier of a second cell connected to the relay UE, transmits an assistance message to the first cell indicating a different identifier, and performs communication based on resource information received from the first cell, allowing efficient discovery and utilization of inter-cell relay UEs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a UE attempts to discover relay UEs in different cells using existing technologies, then the discovery process becomes complex and inefficient, but the system can still establish communication paths with difficulty
Solution Approach 1:
The relay UE transmits pre-configured discovery messages containing cell identifier information before actual communication is needed. This preliminary action allows the remote UE to identify suitable relay UEs in advance, reducing discovery time and complexity when communication is actually required.
Solution Approach 2:
The patent introduces an assistance message as an intermediary carrier that conveys cell identifier information from the relay UE to the remote UE. This intermediary structure simplifies the discovery process by providing a standardized format for exchanging critical identification information across cell boundaries.
2Adaptability or versatility
If relay UEs in different cells are connected, then communication coverage is extended, but resource allocation and coordination between cells becomes more difficult
Solution Approach 1:
The patent segments the resource allocation process into distinct phases: discovery phase (where relay UEs broadcast availability), selection phase (where remote UEs identify suitable relays), and communication phase (where resources are allocated). This segmentation simplifies inter-cell coordination by handling different aspects separately rather than simultaneously.
Solution Approach 2:
The system implements feedback mechanisms where the network receives information about relay UE configurations and cell identifiers, processes this information, and provides resource allocation decisions back to the UEs. This feedback loop enables coordinated resource management across multiple cells while maintaining adaptability.
3Reliability
If D2D communication is established via relay UEs across different cells, then communication reliability is improved, but the signaling overhead and message exchange increases
Solution Approach 1:
The patent combines multiple pieces of information (cell identifiers, relay UE configuration, resource allocation details) into unified message structures such as the assistance message and discovery message. This merging reduces the total number of separate signaling exchanges required while ensuring all necessary information is conveyed for reliable inter-cell D2D communication.
Data Source
AI summary
A method for communicating a relay user equipment (UE) for a device to device (D2D) link at a UE in a wireless communication system is disclosed. The method includes steps of receiving, from the relay UE, information on an identifier of a second cell connected with the relay UE; transmitting, to a first cell connected with the UE, an assistance message including information that an identifier of the first cell is different from the identifier of the second cell; receiving, from the first cell, a resource allocation message including resource information for a communication via the relay UE; and performing the communication via the relay UE based on the resource information.