Adaptive Subcarrier Spacing for PRACH Transmission Reliability
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Solution Overview
Problem
Current subcarrier spacing configurations in 5G wireless communication networks, such as those for new radio (NR) communications, do not provide the desired level of speed or customization for efficient operations, particularly in scenarios like random access channel (RACH) procedures, leading to inefficiencies and potential failures in transmission.
Innovation Solution
Implementing adaptive subcarrier spacing configurations, where user equipment (UE) can adjust subcarrier spacings for repeated PRACH transmissions based on initial transmission failures, and receiving configurations from the network for RACH procedures, allowing for different subcarrier spacings for various steps and subframes, enhancing transmission reliability and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed subcarrier spacing configuration is used for PRACH transmissions, then device complexity is reduced, but transmission reliability deteriorates when initial transmissions fail
Solution Approach 1:
The patent implements dynamic subcarrier spacing adjustment where the UE changes subcarrier spacing based on transmission outcomes. The UE monitors PRACH transmission success and adapts subcarrier spacing for retransmissions, transforming a static configuration into a dynamic adaptive system that responds to channel conditions and transmission results.
Solution Approach 2:
The patent changes the subcarrier spacing parameter adaptively based on transmission success. When PRACH transmission fails, the UE modifies the subcarrier spacing parameter for subsequent retransmissions, exploring different parameter values to improve transmission reliability without requiring complex protocol changes.
2Reliability
If adaptive subcarrier spacing configuration is implemented, then transmission reliability improves, but device complexity increases
Solution Approach 1:
The UE performs self-service by autonomously monitoring its own PRACH transmission success and independently deciding when to adjust subcarrier spacing for retransmissions. This self-service approach improves reliability without requiring complex network coordination or additional signaling infrastructure.
Solution Approach 2:
The patent implements a feedback mechanism where the UE monitors transmission outcomes and uses this feedback to adjust subcarrier spacing for subsequent transmissions. This closed-loop feedback system enables adaptive optimization of transmission parameters based on actual channel conditions and transmission success rates.
3Productivity
If single subcarrier spacing is used for all PRACH transmissions, then ease of operation is maintained, but productivity decreases due to repeated failed transmissions
Solution Approach 1:
The patent applies parameter changes by modifying subcarrier spacing values based on transmission outcomes. This enables the system to adapt to different channel conditions and transmission scenarios, improving RACH procedure efficiency by reducing failed retransmissions while maintaining operational simplicity through automated parameter adjustment.
4Productivity
If fixed subcarrier spacing configuration is used, then network entity complexity is reduced, but resource usage efficiency deteriorates due to unsuccessful retransmissions
Solution Approach 1:
The patent implements dynamic subcarrier spacing configuration where the network entity receives and processes adaptive subcarrier spacing information from the UE. This dynamic approach improves resource usage efficiency by enabling successful transmissions through adaptive parameter selection, while the network entity complexity remains manageable through standardized processing procedures.
Data Source
AI summary
Methods and apparatuses for adaptive subcarrier spacing in wireless communication networks are described. For example, the described aspects include transmitting, from the UE to a network entity, a first PRACH transmission with a first subcarrier spacing; determining, by the UE, that the first PRACH transmission to the network entity is not successful; and transmitting, from the UE, a second PRACH transmission with a second subcarrier spacing in response to determining that the first PRACH transmission is not successful, wherein the first subcarrier spacing is different from the second subcarrier spacing.