PRACH Power Control for SBFD Random Access Occasions
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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 flexibility and configurability for various use cases, including enhanced Mobile Broadband (eMBB), massive Machine-Type Communication (mMTC), and Ultra-Reliable and Low-Latency Communication (URLLC), particularly in subband full duplex (SBFD) regions.
Innovation Solution
A user equipment (UE) is equipped with computer-executable instructions to select a random access channel occasion (RO) and determine PRACH transmission power based on whether the RO is within a subband full duplex (SBFD) region, using different preamble received target powers and power ramping steps, adjusted by radio resource control (RRC) parameters from the base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single preamble received target power is used for all ROs, then device complexity is reduced, but communication reliability deteriorates in SBFD regions due to interference
Solution Approach 1:
The patent applies local quality by implementing different preamble received target power values specifically for SBFD regions versus non-SBFD regions. The UE determines whether an RO is located in an SBFD region and selects appropriate power parameters accordingly, allowing optimized power control tailored to the specific regional characteristics without requiring complete reconfiguration of the power control system.
Solution Approach 2:
The patent implements dynamics by enabling the UE to dynamically select between different preamble received target power values based on the real-time location of the RO. The power control parameter is not fixed but adapts according to whether the current RO falls within an SBFD region, allowing the system to respond flexibly to changing transmission conditions.
2Reliability
If different preamble received target powers are used for SBFD and non-SBFD regions, then communication reliability is improved, but device complexity increases
Solution Approach 1:
The patent applies parameter changes by modifying the preamble received target power parameter based on the RO location. The network configures at least two different preamble received target power values, and the UE changes the active parameter value according to whether the current RO is in an SBFD region, thereby adapting the power control characteristics to match the interference conditions of different regions.
3Reliability
If PRACH transmission power is increased in SBFD regions, then communication reliability is improved, but energy consumption increases
Solution Approach 1:
The patent applies parameter changes by adjusting the preamble received target power parameter specifically for SBFD regions. By changing this power control parameter, the system enables the UE to transmit at appropriate power levels that account for the higher interference conditions in SBFD regions, thereby improving access success rates without unnecessarily increasing power consumption in all regions.
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 select a random access (RA) channel occasion (RO) from several ROs associated with a single synchronization SS/PBCH block; determine whether the RO is within a subband full duplex (SBFD) region in time domain; if the RO is fully within the SBFD region: select a first preamble received target power and determine a current PRACH transmission power based on the first preamble received target power; if the RO is fully outside the SBFD region: select a second preamble received target power, where the second preamble received target power is different from the first preamble received target power; and determine the current PRACH transmission power based on the second preamble received target power; and transmit, to a BS, an RA preamble in the RO at the current PRACH transmission power.