Unlicensed Band Transmission Timing Control
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Solution Overview
Problem
Current unlicensed band transmission technologies face challenges in matching the granularity of Listen Before Talk (LBT) mechanisms with the time-domain scheduling, leading to inconsistencies in transmission timing and potential interference in New Radio (NR) systems, particularly due to the limitations in subcarrier spacing and time-domain symbol alignment.
Innovation Solution
The proposed method involves a terminal and network device that utilize indication information to determine the actual ending position of transmission, which can be either at the boundary or within a reference time-domain symbol, allowing for flexible alignment and ensuring consistent gaps between transmissions through the use of multiple indicator fields and offset indicators in the downlink control information (DCI) or radio resource control (RRC) signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If transmission scheduling is performed using fixed time-domain symbols, then scheduling simplicity is maintained, but granularity mismatch with LBT mechanism occurs
Solution Approach 1:
The patent applies dynamics by making the transmission ending position flexible rather than fixed. The network device can dynamically adjust the ending position to be either at the boundary of a time-domain symbol or inside the symbol, allowing the system to adapt to different LBT timing requirements while maintaining scheduling simplicity through indication information signaling.
2Device complexity
If transmission ending position is fixed at symbol boundary, then scheduling complexity is reduced, but LBT mechanism alignment is compromised
Solution Approach 1:
The patent applies parameter changes by allowing the ending position parameter to take two possible values: at the boundary of a time-domain symbol or inside the symbol. This parameter flexibility enables precise timing alignment with LBT mechanism while the network device manages complexity through indication information that specifies which position applies.
3Adaptability or versatility
If subcarrier spacing is limited, then system compatibility is maintained, but time-domain symbol alignment flexibility is reduced
Solution Approach 1:
The patent applies segmentation by dividing the time-domain symbol into two possible ending position options: boundary position and interior position. This segmentation allows the system to maintain compatibility with limited subcarrier spacing configurations while providing alignment flexibility through the choice of ending position, with the network device selecting the appropriate position based on LBT timing requirements.
Data Source
AI summary
An unlicensed band information transmission method includes: receiving indication information; and obtaining an actual ending position of a transmission according to the indication information, wherein the actual ending position is located at an end position of a reference time domain symbol, or the actual end position is located inside the reference time domain symbol.