Uplink Resource Release for Full Duplex Self-Interference Reduction
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing semi-persistent uplink transmissions in full duplex wireless communication systems, particularly in optimizing resource allocation and reducing self-interference during overlapping transmission and reception periods.
Innovation Solution
A method and apparatus for wireless communication that involve releasing an uplink resource associated with a semi-persistent uplink transmission during a portion of a transmission time interval based on a condition, transmitting a feedback message to indicate skipping the semi-persistent uplink transmission, and configuring downlink parameters accordingly to optimize resource usage and reduce self-interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If semi-persistent uplink transmissions are maintained during overlapping TTI portions, then uplink resource allocation is simplified, but self-interference increases and downlink reception quality deteriorates
Solution Approach 1:
The patent implements dynamic resource allocation by allowing the UE to skip semi-persistent uplink transmissions in specific TTI portions where downlink reception is prioritized. This dynamic adjustment resolves the contradiction by adapting resource usage to real-time interference conditions, maintaining simplicity in configuration while reducing self-interference through conditional transmission skipping.
Solution Approach 2:
The system changes the transmission parameter state by switching between transmitting and skipping uplink transmissions based on TTI portion characteristics. This parameter change enables the system to maintain simplified resource allocation while avoiding self-interference by adjusting transmission behavior according to downlink reception requirements.
2Measurement precision
If the UE transmits feedback messages indicating skipped transmissions, then downlink parameter configuration accuracy improves, but signaling overhead increases
Solution Approach 1:
The patent implements a feedback mechanism where the UE sends messages to the network entity indicating whether it is skipping semi-persistent uplink transmissions. This feedback enables the network to accurately configure downlink parameters based on actual transmission status, resolving the contradiction by providing precise information while managing signaling overhead through targeted feedback messages.
3Object-affected harmful factors
If uplink resources are released during overlapping TTI portions, then self-interference is reduced, but resource utilization efficiency decreases
Solution Approach 1:
The patent segments the TTI into different portions, identifying specific overlapping regions where uplink transmission should be skipped to avoid self-interference. This segmentation allows the system to maintain high resource utilization in non-overlapping portions while selectively releasing resources only in problematic overlapping segments, thus resolving the contradiction between reducing self-interference and maintaining resource efficiency.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A first device may release an uplink resource associated with a semi-persistent uplink transmission during a portion of a transmission time interval based at least in part on a condition. For example, the first device may determine that a buffer associated with the first device satisfies a buffer threshold (e.g., a threshold amount of temporarily stored uplink data) during a first temporal period. The buffer may temporarily store uplink data associated with the semi-persistent uplink transmission. The first device may, as a result, transmit, to a second device, a feedback message including an indication that the first device skips the semi-persistent uplink transmission based on releasing the uplink resource.