Full-Duplex Uplink Frequency Hopping With Available Slot Selection
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Solution Overview
Problem
In wireless communications systems, the availability of resources for frequency hopping is unclear when full-duplex operation is enabled, leading to inefficient and unreliable transmissions due to the overlap of downlink and uplink resources in the same slots, which affects the efficiency and quality of communications between user equipment (UE) and network entities.
Innovation Solution
The UE determines available resources and frequency hopping patterns by first identifying available slots for transmissions before determining the frequency hopping pattern, ensuring that each hop corresponds to an available resource, and dropping transmissions if frequency-domain resources are unavailable due to full-duplex operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If frequency hopping is used in full-duplex operation, then communication flexibility is improved, but resource availability becomes unclear leading to transmission failures
Solution Approach 1:
The UE determines available slots for frequency hopping before actual transmissions occur. The network entity provides availability information indicating which slots are suitable for frequency hopping, allowing the UE to plan its frequency hopping pattern in advance while avoiding slots that would cause interference or conflicts in full-duplex operation
Solution Approach 2:
The network entity provides feedback to the UE about slot availability for frequency hopping. This feedback mechanism allows the network to inform the UE which slots are available based on current full-duplex operation status, enabling the UE to adjust its frequency hopping pattern dynamically while maintaining reliable transmissions
2Productivity
If downlink and uplink resources overlap in the same slots, then resource utilization is improved, but transmission reliability deteriorates due to interference
Solution Approach 1:
The network entity determines and communicates slot availability information to the UE before transmissions occur. This preliminary action identifies which slots have overlapping downlink and uplink resources that would cause interference, allowing the UE to avoid these slots for frequency hopping while still utilizing available resources efficiently
Solution Approach 2:
The solution applies different quality requirements to different slots based on their interference characteristics. Slots with overlapping downlink and uplink resources are marked as unavailable for frequency hopping, while slots without overlap are marked as available. This local differentiation allows the system to maintain high resource utilization in interference-free slots while protecting transmission reliability
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive a message indicating a frequency hopping configuration for repetitions of an uplink message that are to be transmitted via a set of resources, including one or more resources that support full-duplex communications. The UE may determine that some resources of the set of resources are available for transmitting the repetitions in a time domain. The UE may use a frequency hopping pattern to transmit the uplink message and the repetitions of the uplink message, where the frequency hopping pattern may include two or more frequency hops and based on the available resources and the frequency hopping configuration. In some cases, the UE may determine that some resources of the set of resources are unavailable in a frequency domain, and as such, the UE may drop respective transmissions of the uplink messages on the unavailable resources.