5G Uplink Power Control with Timed PUCCH and BWP Switching
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Solution Overview
Problem
In new radio (NR) systems, the challenge of effective uplink power control for Physical Uplink Control Channels (PUCCH) and efficient Bandwidth Part (BWP) switching is exacerbated by the use of different waveforms for PUCCH and Physical Uplink Shared Channels (PUSCH), leading to suboptimal frequency diversity and performance issues, while the transition of active BWPs without defined timing affects data transmission.
Innovation Solution
A method and device for uplink power control that determines the timing between power control commands and PUCCH transmission, adjusting transmission power based on explicit or implicit signaling, and implements efficient BWP switching by aligning active BWP transitions with data reception and transmission timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different waveforms are used for PUCCH and PUSCH, then waveform flexibility is improved, but frequency diversity is worsened
Solution Approach 1:
The patent merges the waveform selection for PUCCH and PUSCH by enabling the UE to use the same waveform (CP-OFDM or SC-FDM) for both channels. This is achieved through DCI signaling that indicates whether to use CP-OFDM or SC-FDM waveform, allowing the UE to select a single waveform type for both uplink control and data channels, thereby improving frequency diversity while maintaining waveform flexibility.
2Adaptability or versatility
If active BWP transitions occur without defined timing, then BWP switching flexibility is improved, but data transmission reliability is worsened
Solution Approach 1:
The patent applies preliminary action by defining specific timing relationships before BWP transitions occur. The DCI indicates a BWP switch at a predetermined time relative to the current time slot, allowing the UE to prepare for the transition in advance and ensure data transmission reliability is maintained during the switching process.
Solution Approach 2:
The patent implements feedback mechanisms where the UE reports its active BWP status and receives confirmation from the gNodeB. This feedback loop ensures that BWP transitions are coordinated properly and that data transmission reliability is maintained during and after the switching process.
3Speed
If power control commands are applied without timing adjustment, then power control responsiveness is improved, but transmission performance is worsened
Solution Approach 1:
The patent applies dynamics by making the power control timing adjustable based on the specific transmission scenario. The UE determines the appropriate timing offset between receiving the power control command and applying it to the PUCCH transmission. This dynamic timing adjustment allows the system to optimize both responsiveness and transmission performance according to actual channel conditions and transmission requirements.
Data Source
AI summary
The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. The present disclosure provides a method for uplink power control, which is applied to a User Equipment (UE), and the method includes: determining a timing between a power control command and a Physical Uplink Control Channel (PUCCH), which adopts the power control command to control power. The present disclosure also provides a corresponding device.