Small Data Transmission Power Ramping in RRC Inactive State
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Solution Overview
Problem
In wireless communication systems, particularly in the New Radio (NR) network, User Equipment (UE) faces challenges in transmitting small data packets in the RRC_INACTIVE state, as existing methods do not effectively ensure successful transmission, leading to inefficiencies and potential fallbacks in random access procedures.
Innovation Solution
A method is introduced where the UE determines whether to transmit small data packets in RRC_INACTIVE state by selecting a step-size for preamble sequence transmission, updating counters, and adjusting transmission power based on thresholds, ensuring successful random access by monitoring signals and adapting power levels accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE transmits small data packets in RRC_INACTIVE state using conventional power levels, then the transmission power consumption is reduced, but the transmission success rate deteriorates
Solution Approach 1:
The patent implements dynamic power adjustment by introducing a power ramping mechanism where the transmission power is adaptively increased based on the number of transmission attempts. The UE maintains an initial power level for the first transmission and ramps up the power for subsequent transmissions if the initial attempt fails, thereby optimizing the balance between power consumption and transmission success rate.
Solution Approach 2:
The patent changes the power parameter dynamically during the transmission process. By modifying the transmission power level based on transmission counter values and configured thresholds, the system adapts to varying channel conditions and ensures reliable delivery of small data packets while minimizing unnecessary power consumption.
2Reliability
If the UE ramps up the preamble transmission power to ensure successful transmission, then the transmission success rate improves, but the impact on other random access processes increases
Solution Approach 1:
The patent applies local quality by differentiating the power ramping behavior for small data packet transmissions versus conventional random access procedures. The UE uses a separate power ramping counter specifically for small data transmissions in RRC_INACTIVE state, allowing targeted power adjustment only when necessary, thereby minimizing interference to other random access processes while ensuring successful small data transmission.
Solution Approach 2:
The patent segments the random access power control into separate mechanisms: one for conventional random access and another for small data packet transmission in RRC_INACTIVE state. This segmentation allows independent optimization of each process, enabling power ramping for small data transmissions without adversely affecting the performance of other random access procedures.
3Productivity
If the UE uses a unified power ramping mechanism for all random access types, then the device complexity is reduced, but the transmission efficiency for small data packets deteriorates
Solution Approach 1:
The patent implements self-service by enabling the UE to autonomously manage power ramping for small data transmissions using locally maintained counters and configured parameters. The UE independently determines when to ramp power based on transmission outcomes and pre-configured thresholds, eliminating the need for complex centralized control while improving transmission efficiency for small data packets.
Data Source
AI summary
The present disclosure provides a method and device used in a communication node for wireless communications. A communication node determines that first data is transmitted in a first state, selects a first step-size, and transmits a first signal according to first target power; updates a first counter; when the first counter is not greater than a first threshold, and determines that a second counter is updated, transmits a third signal according to second target power; monitors a second signal in a first time window; the first state comprises RRC_INACTIVE State; the first data comprises a small data packet; the first signal, the second signal and the third signal are used for random access procedure; the first counter is used to count a number of transmission(s) of a preamble sequence; the second counter is used to count a number of time(s) the first step-size is increased.