PRACH Power Ramping for SBFD Random Access Retransmissions
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Solution Overview
Problem
There is a need for improved methods to control Physical Random Access Channel (PRACH) transmission power in next-generation radio communication systems, such as 5G NR, to enhance data rate, latency, and reliability, particularly in scenarios involving subband full duplex (SBFD) regions.
Innovation Solution
A user equipment (UE) is equipped with mechanisms to manage PRACH transmission power using two power ramping counters, adjusting power levels based on the presence or absence of SBFD regions and receiving acknowledgement signals, to optimize PRACH retransmissions and successful random access procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PRACH transmission power is increased to improve random access success rate, then reliability is improved, but energy consumption increases
Solution Approach 1:
The patent implements dynamic PRACH transmission power control by introducing two separate power ramping counters (first power ramping counter for SBFD regions, second power ramping counter for non-SBFD regions). The transmission power is dynamically adjusted based on the detected region type and retransmission history, allowing the system to optimize power consumption while maintaining reliable random access success rate through adaptive power management.
2Reliability
If power ramping counter is incremented for each retransmission, then transmission reliability is improved, but time delay increases
Solution Approach 1:
The patent segments the power ramping process into two independent counters based on region type (SBFD and non-SBFD). This segmentation allows selective power ramping only when necessary, avoiding unnecessary time delay in regions where power adjustment is not needed, while maintaining reliability through targeted power optimization in SBFD regions.
Solution Approach 2:
The patent applies different power ramping strategies to different regions. The first power ramping counter is used specifically for SBFD regions where power optimization is critical, while the second counter is used for non-SBFD regions. This local quality approach ensures that time delay is minimized by applying power ramping only where necessary, while maintaining transmission reliability through region-specific optimization.
3Device complexity
If single power ramping counter is used for all regions, then device complexity is reduced, but adaptability to different regions deteriorates
Solution Approach 1:
The patent segments the power control mechanism into two separate counters (first power ramping counter for SBFD regions, second power ramping counter for non-SBFD regions). This segmentation increases complexity slightly but enables region-specific adaptability, allowing the system to optimize power management for different region types while maintaining manageable complexity through structured organization.
Solution Approach 2:
The patent implements local quality by assigning different power ramping counters to different regions. The first counter is dedicated to SBFD regions requiring power optimization, while the second counter serves non-SBFD regions. This approach provides region-specific adaptability and optimization while keeping the overall control mechanism organized and manageable through clear regional differentiation.
Data Source
AI summary
A UE that controls physical random access channel (PRACH) transmission power is provided. The processor of the UE is configured to initialize first and second power ramping counters; select a first random access (RA) channel occasion (RO) associated with a single SS/PBCH block; transmit an RA preamble to a BS in the first RO at a first PRACH transmission power; determine that an RA response (RAR) corresponding to the transmitted preamble is not received from the BS; select a second RO associated with the single SS/PBCH block; if the second RO is within an SBFD region, increment the first counter and determine a current PRACH transmission power as a function of the first counter; otherwise, increment the second counter and determine the current PRACH transmission power as a function of the second counter; and retransmit the RA preamble in the second RO at the current PRACH transmission power.