Uplink Power Control for 5G Unlicensed Coexistence
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Solution Overview
Problem
In 5G communication systems, there is a challenge in quickly adjusting transmission power during the listen before talk (LBT) process to prevent channel occupation by other devices on unlicensed bands, while ensuring coexistence with other systems, which contradicts the requirement of no power limitations during the power increase transition time.
Innovation Solution
A method for transmitting uplink information that involves detecting control signaling, determining maximum transmission power based on LBT success, and adjusting power to ensure coexistence, including specific formulas and timing configurations for power increase and decrease transitions to avoid collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmission power is quickly increased after LBT to prevent channel occupation by other devices, then channel access reliability is improved, but power transition time requirements are violated
Solution Approach 1:
The patent applies preliminary action by performing LBT (Listen Before Talk) before actual uplink transmission. The UE detects the channel status in advance and determines whether the channel is available before initiating power increase and transmission, ensuring reliable channel access while managing power transition timing constraints.
Solution Approach 2:
The patent implements dynamic power adjustment where the UE's transmission power is adaptively controlled based on LBT outcomes and channel conditions. The power increases from a first value to a second value dynamically after successful LBT, allowing the system to balance between quick channel access and compliance with power transition time requirements.
2Adaptability or versatility
If total uplink transmission power is controlled to ensure coexistence with other devices, then system compatibility is improved, but transmission power flexibility is reduced
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the total uplink transmission power parameter based on channel access outcomes and coexistence requirements. The power is changed from a first value to a second value after successful LBT, and the base station controls the total power of multiple UEs to ensure it does not exceed thresholds that would interfere with other wireless devices operating in the unlicensed band.
Solution Approach 2:
The patent implements feedback mechanisms where the base station receives uplink transmissions from multiple UEs and monitors channel conditions. The base station controls and adjusts the total uplink transmission power of all scheduled UEs based on observed channel usage and interference levels, ensuring coexistence with other devices while maintaining system performance.
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 application provides a method for transmitting uplink information, which includes the following: a UE detects control information, i.e., UL-Grant for scheduling uplink data transmissions from a base station; determines according to the control information, the number of PRBs resource allocated by the base station, determining a maximum transmission power allowed in the current sub-frame, determines an uplink transmission power of the UE; executes an LBT according to UL-Grant configurations, and starts an uplink data transmission after the LBT is successful. By adopting the method of the present disclosure, the total uplink transmission power of an entire cell in one sub-frame is controlled, so as to realize coexistence with other devices. Further, by reasonably setting an LBT time period and power increase transition time, the probability of collisions among devices is reduced.