Uplink Power Control for Multiple RACH Procedures
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing uplink power control for multiple random access channel (RACH) procedures, particularly in scenarios where user equipment (UE) needs to communicate with multiple transmission reception points (TRPs) simultaneously, leading to complexities in synchronization and power management.
Innovation Solution
The implementation of a method where a user equipment (UE) maintains separate counters and parameters for multiple simultaneous RACH procedures, allowing it to determine and adjust transmission power for each procedure independently, by initializing, updating, and resetting counters based on the status of each RACH occasion, enabling efficient power control across different TRPs and timing advance groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE maintains separate counters and parameters for multiple simultaneous RACH procedures, then the uplink synchronization and communication reliability with multiple TRPs is improved, but the device complexity and management overhead increase
Solution Approach 1:
The patent divides the counter management into separate, independent sets for each RACH procedure. Each set includes dedicated counters (e.g., preamble transmission counter, power ramp counter) specific to that procedure, allowing independent tracking and control without interference between multiple simultaneous RACH procedures. This segmentation enables reliable uplink synchronization with multiple TRPs while maintaining manageable complexity through structured organization.
Solution Approach 2:
The patent applies local quality by assigning distinct counter values and parameters to each RACH procedure based on its specific status and requirements. Each procedure maintains its own counter state (e.g., current preamble transmission count, power ramp level) independent of other procedures, allowing tailored power control and synchronization management for each TRP connection according to its local conditions.
2Productivity
If the UE performs simultaneous RACH procedures with multiple TRPs, then the communication productivity and reduced latency are improved, but the power control management becomes more complex
Solution Approach 1:
The patent segments the power control management into separate counter sets for each RACH procedure. Each procedure has its own power ramp counter and preamble transmission counter, enabling independent power adjustment and control. This allows the UE to simultaneously manage multiple TRPs with different power requirements without creating a unified complex control system, thus maintaining high productivity while managing complexity through decomposition.
Solution Approach 2:
The patent implements dynamic counter management where counters are initialized, updated, and reset based on the real-time status of each RACH procedure. The MAC entity dynamically adjusts counter values (e.g., incrementing preamble transmission counter on failure, resetting on success) according to procedure-specific conditions, enabling adaptive power control that responds to changing communication conditions across multiple TRPs simultaneously.
3Measurement precision
If the MAC entity maintains multiple sets of counters for different timing advance groups, then the synchronization accuracy is improved, but the processing overhead increases
Solution Approach 1:
The patent segments counter maintenance by timing advance group, with each group having its own dedicated counter set. This segmentation allows the MAC entity to track synchronization status independently for each TRP or TRP group, improving synchronization accuracy by maintaining separate timing references. The segmented structure enables parallel processing of counter updates for different groups, reducing overall processing time compared to a unified approach.
Solution Approach 2:
The patent applies local quality by maintaining counter states specific to each timing advance group's local synchronization requirements. Each group's counters reflect its specific timing conditions and synchronization status, allowing precise local control without requiring processing of all groups' data simultaneously. This localized approach improves measurement precision while minimizing processing overhead by focusing computations only on relevant groups.
Data Source
AI summary
Methods, systems, and devices for wireless communication at a user equipment (UE) are described. The UE may be configured to support uplink power control for multiple random access channel (RACH) procedures. A medium access control layer entity at the UE may maintain multiple sets of counters and parameters for multiple simultaneous RACH procedures. In some cases, the UE may perform simultaneous RACH procedures with network entities associated with different timing advance groups, and the UE may associate the counters and parameters of the RACH procedure with the timing advance group. In other cases, the UE may associate the counters and parameters of the RACH procedure with multiple control resource set pool indexes which may correspond to multiple transmission reception points. Each set of counters may be associated with an uplink power control that the UE may use to determine the PRACH transmission power for each RACH procedure.