PRACH Power Control for Slot-Adaptive Sub-Band Full-Duplex
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Solution Overview
Problem
In sub-band full-duplex (SBFD) networks, cross-link interference (CLI) and reduced uplink quality due to self-interference and inter-cell interference affect the transmission of physical random access channel (PRACH) messages, making it challenging for user equipment (UE) to establish initial access or re-establish access after link failure.
Innovation Solution
Implementing power control mechanisms that adapt transmission power based on slot type, using separate power ramping steps for transitions between half-duplex (HD) and SBFD slots, maintaining separate power states, or adding offsets for SBFD slots to mitigate CLI and improve PRACH reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power control mechanisms are implemented to mitigate cross-link interference in SBFD networks, then PRACH transmission success rate is improved, but system complexity increases due to separate power states and ramping steps for different slot types
Solution Approach 1:
The power control mechanism is segmented by slot type, with separate power states and ramping steps defined for half-duplex slots and SBFD slots. This segmentation allows targeted optimization for each slot type while managing complexity through structured differentiation.
Solution Approach 2:
The power control mechanism dynamically adapts to different slot types by switching between half-duplex power states and SBFD power states. The UE determines the appropriate power state based on the slot type indicator, enabling flexible and context-aware power control.
2Object-affected harmful factors
If separate power states and ramping steps are used for half-duplex and SBFD slots, then uplink quality is improved by minimizing CLI, but transmission protocol complexity increases
Solution Approach 1:
Different power control parameters are applied locally to different slot types. Half-duplex slots use one set of power states and ramping steps, while SBFD slots use another set optimized for minimizing cross-link interference. This local optimization reduces harmful effects without requiring global system redesign.
Solution Approach 2:
The power control mechanism changes key parameters (power states, ramping steps) based on slot type. By adjusting these parameters dynamically, the system optimizes performance for each slot type while managing complexity through parameter differentiation rather than structural complexity.
3Measurement precision
If power control mechanisms are implemented for SBFD slots, then PRACH reception quality is improved, but energy consumption increases due to adaptive power adjustments
Solution Approach 1:
The network configures the UE with separate power states and ramping steps for SBFD slots in advance. This preliminary configuration allows the UE to perform adaptive power adjustments without real-time computation, reducing energy consumption while maintaining reception quality.
Data Source
AI summary
Aspects relate to mechanisms for providing power control for sub-band full-duplex (SBFD) random access channel (RACH) preamble message transmissions. A user equipment (UE) can transit a first random access preamble message at a first transmit power in a first slot and a second random access preamble message (e.g., a retransmission) at a second transmit power in a second slot. The second transmit power can be adapted corresponding to a respective slot type of each of the first slot and the second slot.