Uplink TPC Timing for Consistent PUSCH Power in TDW
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Solution Overview
Problem
Challenges exist in implementing transmit power control (TPC) commands during a time domain window (TDW) in wireless communication systems, particularly in maintaining power consistency and phase continuity among multiple physical uplink shared channel (PUSCH) transmissions, which can affect uplink coverage and interference with other devices.
Innovation Solution
A user equipment (UE) is configured to receive power control modes and timeline measurements for PUSCH transmissions within a TDW, determining an effective TPC command based on time constraints and applying it to subsequent transmissions, using accumulate or absolute power control modes to ensure power consistency and phase continuity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If TPC commands are implemented during a TDW with multiple PUSCH transmissions, then power control flexibility is improved, but maintaining power consistency and phase continuity becomes difficult
Solution Approach 1:
The patent segments the TDW into multiple PUSCH transmission occasions and applies different TPC command types (group-common TPC for power consistency, UE-specific TPC for phase continuity) to different segments, resolving the contradiction between flexibility and consistency
Solution Approach 2:
Different TPC command processing rules are applied to different local contexts within the TDW: group-common TPC commands are applied to maintain power consistency across all PUSCH transmissions, while UE-specific TPC commands are applied to adjust phase continuity for specific transmissions
2Adaptability or versatility
If multiple TPC commands are applied to multiple PUSCH transmissions, then transmission adaptability is improved, but interference control becomes challenging
Solution Approach 1:
The patent implements feedback mechanisms where the base station monitors uplink transmission quality and sends appropriate TPC commands (group-common or UE-specific) to adjust UE transmit power, thereby controlling interference while maintaining adaptability
Solution Approach 2:
The system dynamically changes power control parameters based on network conditions: using group-common TPC commands when power consistency is needed to reduce interference, and UE-specific TPC commands when transmission adaptability is prioritized
3Measurement precision
If TPC commands are processed for each PUSCH transmission, then transmission precision is improved, but processing complexity increases
Solution Approach 1:
The patent merges multiple TPC command processing operations by introducing a determination module that consolidates the decision-making process: it determines whether to apply group-common or UE-specific TPC commands based on transmission characteristics, thereby reducing overall processing complexity while maintaining precision
Data Source
AI summary
A user equipment (UE) is provided to implement a set of transmit power control (TPC) commands during a time domain window (TDW) including multiple physical uplink shared channel (PUSCH) transmissions. The UE can receive a configuration from the base station to configure the UE to support a power control mode and a timeline measurement related to a PUSCH transmission. The UE can receive a set of TPC commands during the TDW, determine whether a TPC command of the set of TPC commands satisfies a time constraint based on the timeline measurement, determine an effective TPC command for the set of TPC commands based on one or more TPC commands satisfying the time constraint, determine an effective delay for the effective TPC command based on the timeline measurement, and further apply the effective TPC command to a PUSCH transmission determined based on the effective delay of the effective TPC command.