Duplex Mode Switching During Random Access With UE Capability Signaling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently switching between half-duplex and full-duplex modes during random access, particularly in 5G/NR networks, leading to issues such as reduced spectral efficiency, increased latency, and interference due to cross-link interference and self-interference.
Innovation Solution
A method and apparatus for switching duplex mode during random access are provided, enabling user equipment (UE) and base stations (BS) to determine and communicate UE capabilities for full-duplex operation through system information blocks (SIBs), allowing dynamic adaptation of transmission and reception configurations based on random access procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the system operates in half-duplex mode during random access, then device complexity is reduced and ease of operation is improved, but spectral efficiency decreases and latency increases
Solution Approach 1:
The system dynamically switches between half-duplex and full-duplex modes during the random access procedure based on message type and network configuration. The duplex mode is not fixed but adapts throughout the RA process, allowing the system to optimize spectral efficiency while maintaining operational simplicity where applicable.
Solution Approach 2:
The system changes the duplex mode parameter from half-duplex to full-duplex based on the random access message type (2-step vs 4-step) and network capabilities. This parameter change enables the system to achieve higher spectral efficiency when needed while preserving ease of operation in scenarios where half-duplex suffices.
2Productivity
If the system switches to full-duplex mode during random access, then spectral efficiency is improved and latency is reduced, but interference increases due to cross-link interference and self-interference
Solution Approach 1:
The system applies full-duplex operation selectively to specific random access messages and frequency resources rather than universally. Different quality settings (duplex modes) are applied to different parts of the communication process based on message type, reducing interference while maintaining spectral efficiency benefits where applicable.
Solution Approach 2:
The network acts as an intermediary by controlling and coordinating full-duplex operations during random access. The base station manages the switching between modes and configures resources to minimize cross-link interference, mediating between UEs to prevent harmful interference while enabling full-duplex benefits.
3Productivity
If the system uses dynamic duplex mode switching, then spectral efficiency is improved and latency is reduced, but device complexity and base station complexity increase
Solution Approach 1:
The dynamic switching between half-duplex and full-duplex modes during random access allows the system to achieve higher spectral efficiency and reduced latency. The complexity is managed by implementing the switching logic in the protocol layer, which coordinates mode changes based on message type and network configuration, balancing performance gains with acceptable device and network complexity.
Data Source
AI summary
Methods and apparatuses for switching duplex mode during random access (RA). A method for operating a user equipment (UE) includes receiving a system information block (SIB) for a cell that provides information for a first configuration of slots for transmissions or receptions in a half-duplex mode and a random access (RA) procedure, determining a UE capability for transmitting and receiving in a full-duplex mode, and determining a transmission of a channel based on the RA procedure and the first configuration of slots. The method further includes transmitting the channel including information of the UE capability using the RA procedure and receiving information for a second configuration of slots for transmissions or receptions in the full-duplex mode.