Unlicensed Spectrum Power Adjustment via Transient Period Overlap
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Solution Overview
Problem
In mobile communication systems using unlicensed spectra, the transient periods for power adjustment can lead to high demodulation errors due to unstable power conditions, and existing technologies face challenges in ensuring reliable transmission without Listen Before Talk (LBT) procedures, especially when the gap between transmissions is short.
Innovation Solution
The method involves adjusting transmission power from off to on within a first transient period that overlaps with a gap between the end of a previous transmission and the start of a target transmission, allowing flexible power management and reducing the impact of transient periods on actual symbols, thereby improving transmission reliability and decoding success rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If transmission power is adjusted during transient period, then power management flexibility is improved, but demodulation error rate increases due to unstable power conditions
Solution Approach 1:
The patent applies preliminary action by performing power adjustment in advance during the transient period before the actual transmission begins. The transmission power is adjusted from off to on within the first transient period, which overlaps with the gap between transmissions. This preliminary power adjustment ensures that the power is stabilized before the target transmission starts, reducing demodulation errors while maintaining power management flexibility.
2Stability of the object's composition
If transient period is extended for power adjustment, then power stability is improved, but transmission time is reduced due to symbols occupied by transient period
Solution Approach 1:
The patent merges the transient period with the gap between transmissions. The first transient period is configured to overlap with the first gap in time domain, combining the power adjustment time with the existing gap period. This merging allows power stability to be achieved without extending the overall transmission time, as the transient period utilizes the gap time that would otherwise be unused.
Solution Approach 2:
The patent utilizes the time domain dimension by overlapping the transient period with the gap between transmissions. Instead of extending the transient period sequentially after transmission, the patent places it in the temporal dimension during the gap, effectively using idle time for power adjustment without impacting the actual transmission duration.
3Reliability
If LBT procedure is performed before transmission, then transmission reliability is improved, but transmission delay increases due to LBT processing time
Solution Approach 1:
The patent extracts the LBT procedure from the transmission timeline by allowing direct transmission without preceding LBT when the gap between transmissions is sufficiently short. The first gap time length is configured to be less than a second preset value, indicating that when the gap is short, LBT is skipped and direct transmission occurs. This extraction of LBT from the transmission sequence reduces transmission delay while maintaining reliability through the overlapping transient period power adjustment.
Data Source
AI summary
Provided are a power adjustment method and apparatus for an unlicensed spectrum, and a terminal device and a network device. The method comprises: a terminal device adjusting, in a first transition period, a transmission power from turning-off to turning-on for a target transmission, wherein the first transition period and a first gap at least partially overlap in a time domain, the first gap comprises the length of time between an end moment of a first transmission and a start moment of the target transmission, and the first transmission is the most recent transmission before the target transmission.