D2D Relay UE Sidelink Resource Allocation
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Solution Overview
Problem
Current device-to-device (D2D) communication technologies face inefficiencies in power and resource utilization, particularly in LTE systems, which hinder optimal operation and capacity in wireless communication networks.
Innovation Solution
Implementing a D2D relay system where a relay UE assists in relaying information between a remote UE and the base station, utilizing sidelink channels for efficient resource allocation and power management, including the use of radio network temporary identifiers (RNTIs) and eNB-assisted resource allocation to enhance communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If D2D communication is implemented in LTE systems, then direct device-to-device communication capability is improved, but power consumption and resource utilization efficiency deteriorate
Solution Approach 1:
The patent introduces a relay UE as an intermediary device between the remote UE and the base station. The relay UE receives downlink data from the base station and forwards it to the remote UE over PC5 sidelink, while also relaying uplink data from the remote UE to the base station. This intermediary approach enables D2D communication for remote UEs that cannot maintain direct connections, improving adaptability while managing power consumption through intelligent relay selection and connection management.
Solution Approach 2:
The patent implements dynamic relay selection and connection management where the relay UE can be changed based on channel conditions, power status, and communication requirements. The system dynamically establishes, maintains, and releases relay connections to optimize power consumption and resource utilization while maintaining D2D communication capability.
2Reliability
If remote UEs maintain direct connection with base station, then communication reliability is improved, but system capacity and resource utilization deteriorate
Solution Approach 1:
The patent segments the communication path into two parts: a control plane connection between the remote UE and base station for signaling and coordination, and a user plane connection between the relay UE and remote UE over PC5 for data transmission. This segmentation allows the system to maintain reliability through controlled signaling while improving capacity by utilizing device-to-device resources for actual data transfer.
Solution Approach 2:
The relay UE acts as an intermediary that handles data transmission between the remote UE and base station, freeing up base station resources while maintaining reliable communication through coordinated control signaling. The base station maintains control over resource allocation and connection management, ensuring reliability, while the relay UE handles the bulk data transfer, improving system capacity.
3Productivity
If relay UE is introduced for remote UE communication, then system capacity and resource reuse are improved, but device complexity and connection management overhead deteriorate
Solution Approach 1:
The patent implements feedback mechanisms where the remote UE and relay UE exchange information about channel conditions, power status, and communication quality. The base station receives feedback from both devices and uses this information to make intelligent decisions about relay selection, resource allocation, and connection management, thereby reducing overall system complexity through automated decision-making.
Solution Approach 2:
The patent enables the relay UE and remote UE to autonomously perform certain connection management tasks such as establishing PC5 links, negotiating parameters, and managing local resource allocation. This self-service capability reduces the signaling overhead to the base station and simplifies connection management while still maintaining system-wide coordination for capacity optimization.
Data Source
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AI summary
The present aspects relate to device-to-device (D2D) relaying in a wireless communication system. In an aspect, a relay UE receive at least one message including a radio network temporary identifier (RNTI) of at least a remote UE and transmit, on a sidelink channel, a sidelink grant associated with the RNTI to the remote UE.. In another aspect, a remote UE may receive an indication to establish a connection with a relay UE on a sidelink channel, establishing the connection with the relay UE on the sidelink channel, and receive, from the relay UE on the sidelink channel, a sidelink grant associated with a RNTI of the remote UE.