Sub-band Full Duplex Collision Handling for User Equipment
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Solution Overview
Problem
Wireless communication systems face challenges in handling collisions between sub-band full duplex (SBFD) mode operations and half-duplex user equipment (UE) due to timing and frequency domain collisions, leading to communication errors and inefficient resource usage.
Innovation Solution
The method involves a UE receiving an indication of a network node's SBFD mode and using this information to determine whether to receive synchronization signal blocks (SSB) or physical downlink control channel (PDCCH) communications, and to decide on transmitting in random access channel (RACH) occasions, thereby mitigating collisions and improving communication transparency and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the network node operates in sub-band full duplex (SBFD) mode, then spectral efficiency and resource utilization are improved, but timing and frequency domain collisions occur with half-duplex user equipment leading to communication errors
Solution Approach 1:
The patent implements dynamic collision handling where the UE adapts its reception and transmission behavior based on received indications of SBFD mode operation. The UE dynamically determines whether to receive SSB/PDCCH communications or transmit RACH communications in specific symbols, allowing the system to maintain high spectral efficiency while preventing communication errors through real-time adaptation to network node operation modes.
Solution Approach 2:
The patent changes the operational parameters of the UE based on received indications. When the network node operates in SBFD mode, the UE modifies its reception parameters (whether to receive SSB/PDCCH) and transmission parameters (whether to transmit RACH) for specific symbols, thereby resolving the contradiction between maintaining high spectral efficiency and ensuring communication reliability.
2Device complexity
If the UE operates in half-duplex mode without SBFD awareness, then device complexity is reduced, but resource usage becomes inefficient due to missed communications and collisions
Solution Approach 1:
The patent applies preliminary action by having the network node provide advance indications to the UE about its SBFD mode operation in specific symbols. This allows the UE to prepare and adjust its reception and transmission behavior beforehand, improving resource usage efficiency without requiring complex real-time decision-making or full SBFD capability at the UE side.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive an indication that a network node is operating in a sub-band full duplex mode in a set of symbols. The UE may identify whether to receive at least one of a synchronization signal block communication or a physical downlink control channel communication associated with a common search space in the set of symbols based at least in part on the indication. Numerous other aspects are described.