PUSCH Power Control Across HD and SBFD RACH Slots
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Solution Overview
Problem
Wireless communication systems face challenges in calculating closed loop power control parameters for physical uplink shared channels (PUSCH) during random access in subband full-duplex (SBFD) networks, particularly when RACH preambles are transmitted in slots with different slot types (HD or SBFD) than the slot used for the PUSCH message.
Innovation Solution
The wireless device determines a closed loop power control parameter based on the quantity of preambles transmitted and the slot type, applying power ramping adjustments for both HD and SBFD slots to enable efficient power control for PUSCH messages, reducing latency and improving resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If power control parameters are calculated separately for different slot types (HD and SBFD), then power control accuracy is improved, but device complexity increases
Solution Approach 1:
The patent segments the power control mechanism by maintaining separate power control parameters (P0, alpha, powerRampingStep) for different slot types (HD and SBFD). This allows the system to calculate power control parameters separately for each slot type, improving accuracy while managing complexity through structured parameter separation.
Solution Approach 2:
The patent implements dynamic slot type identification and parameter selection, where the wireless device determines the slot type of each RACH occasion and dynamically selects the appropriate power control parameters based on the identified slot type. This dynamic adaptation enables accurate power control without requiring separate dedicated procedures for each slot type.
2Device complexity
If RACH preambles are transmitted only in slots of the same type as the PUSCH message, then power control calculation is simplified, but latency increases
Solution Approach 1:
The patent creates a universal power control framework that handles both HD and SBFD slots through a unified mechanism. The wireless device can transmit RACH preambles in any slot type (HD or SBFD) and the system universally applies appropriate power control parameters based on slot type identification, eliminating the need for separate dedicated procedures and reducing latency.
Solution Approach 2:
The patent changes the power control parameters (P0, alpha, powerRampingStep) based on the slot type. By adjusting these parameters according to whether the slot is HD or SBFD, the system enables flexible preamble transmission in different slot types while maintaining accurate power control, thus reducing latency without excessive complexity.
3Productivity
If power ramping is applied based on total preambles transmitted, then resource utilization is improved, but power control accuracy for specific slot types deteriorates
Solution Approach 1:
The patent applies the power ramping concept from traditional single-slot-type systems to the multi-slot-type scenario by copying and adapting the ramping mechanism. The powerRampingStep parameter is applied based on the count of preambles transmitted in the identified slot type, allowing the system to leverage proven power ramping techniques while accommodating diverse slot types through parameter adaptation.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. The described techniques may enable a wireless device to calculate a closed loop power control parameter for a physical uplink shared channel (PUSCH) message in a random access channel (RACH) procedure in cases where one or more RACH preambles are transmitted in slots with a different slot type (e.g., half-duplex (HD) or subband full-duplex (SBFD)) than a slot used to transmit the PUSCH message. For example, the wireless device may determine a power ramping parameter based on a total quantity of preambles transmitted. Additionally, or alternatively, the wireless device may determine a power ramping parameter based on a quantity of preambles transmitted via slots of the first slot type (e.g., and not preambles transmitted via slots of the different slot type). Additionally, or alternatively, the wireless device may apply a power ramping adjustment parameter.