Dynamic Power Allocation for Uplink Control Channels in Carrier Aggregation
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Solution Overview
Problem
Conventional power scaling methods in LTE and LTE-A systems are inadequate for supporting low-latency communication scenarios, particularly when multiple carriers with different Short Transmission Time Interval (sTTI) configurations are used, leading to reduced performance of uplink control channels.
Innovation Solution
A method involving the transmission of indication information and reference signals on multiple carriers to dynamically regulate transmit power across different time intervals, ensuring proper reception of uplink control information by adapting power allocation based on the types of physical channels transmitted.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional power scaling methods are used in LTE/LTE-A systems, then power allocation is simplified, but performance of uplink control channels deteriorates in low-latency communication scenarios with multiple carriers and sTTI configurations
Solution Approach 1:
The patent implements dynamic power scaling where the base station transmits indication information to dynamically adjust the power scaling factor for PUSCH transmissions. This allows the power allocation to adapt in real-time to varying channel conditions and traffic requirements, resolving the contradiction between simplified conventional methods and the need for reliable control channel performance in dynamic low-latency scenarios
Solution Approach 2:
The patent changes the power scaling parameter by introducing a dynamically adjustable power scaling factor that can be modified through indication information from the base station. This parameter change enables flexible power allocation that maintains control channel performance while adapting to different sTTI configurations and carrier conditions
2Ease of operation
If equal power sharing between multiple carriers is used, then power allocation is simplified, but transmit power of uplink control channels is reduced
Solution Approach 1:
The patent applies local quality by allowing different power scaling factors for different carriers and different channel types (PUCCH vs PUSCH). Instead of uniform equal power sharing, the system can allocate higher power to control channels on specific carriers based on local conditions, maintaining simplicity while preserving control channel power
3Reliability
If dynamic power regulation across multiple time intervals is implemented, then uplink transmission performance is improved, but system complexity increases
Solution Approach 1:
The patent implements feedback-based power regulation where the base station monitors uplink transmission conditions and sends indication information to adjust power scaling factors. This feedback mechanism achieves reliable uplink transmission through dynamic adaptation while keeping the complexity manageable by using centralized control at the base station rather than distributed complexity at the UE
Data Source
AI summary
The present disclosure provides a method and a device in wireless transmission. A User Equipment (UE) transmits Q piece(s) of indication information, and then transmits a first reference signal and a first radio signal on a first carrier, wherein the first radio signal includes L radio sub-signals, and the L radio sub-signals occupy L time intervals respectively. The Q piece(s) of indication information is(are) used for determining ratios of transmit powers of the first radio signal to transmit powers of the first reference signal in Q time interval(s) respectively. The Q time interval(s) is(are) one(Q ones) of the L time intervals. The present disclosure can implement dynamic regulation of transmit powers of the first radio signal in the Q time interval(s), thereby optimizing the transmit power of the first radio signal on the premise of ensuring physical channels carrying control information acquire sufficient transmit powers in carrier aggregation scenarios.