Temporary Power Adjustment Indication for Uplink Interference
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing interference between grant-based and grant-free uplink transmissions on shared resources, leading to inefficiencies in power adjustment and scheduling, particularly in multiplexing different service types with varying reliability and latency requirements.
Innovation Solution
The implementation of temporary power adjustment indication (PAI) by the base station, which adjusts the transmit power of UEs for specific time-frequency resources, allowing UEs with grant-free transmissions to adjust their power based on overlapping resources, reducing interference and improving resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If grant-based transmissions are scheduled on resources allocated for grant-free transmissions, then resource utilization is improved, but interference between transmissions increases
Solution Approach 1:
The patent applies local quality by implementing UE-specific power adjustment indications that target only the specific UE and specific time-frequency resources where interference occurs. Instead of blanket power reduction for all grant-free UEs, the base station sends targeted power adjustment commands to individual UEs on specific resources, thereby reducing interference locally while maintaining overall system performance and resource utilization.
2Object-generated harmful factors
If transmit power is reduced for scheduled transmissions to mitigate interference, then interference to grant-free transmissions is reduced, but transmission reliability of scheduled transmissions deteriorates
Solution Approach 1:
The patent implements dynamic power adjustment where the base station continuously monitors resource usage and sends real-time power adjustment indications to grant-free UEs. The transmit power is dynamically modified based on actual interference conditions rather than being statically reduced, allowing the system to adapt to changing traffic patterns and maintain both interference mitigation and transmission reliability.
Solution Approach 2:
The patent changes the power parameter dynamically through base station control. Instead of permanently reducing transmit power, the base station sends power adjustment indications that temporarily modify the power level of specific grant-free transmissions only when interference is detected, thereby maintaining transmission reliability while reducing interference when necessary.
3Object-generated harmful factors
If power adjustment indications are sent to multiple UEs, then interference mitigation is improved, but signaling overhead increases
Solution Approach 1:
The patent applies partial action by sending power adjustment indications only to the specific UEs that are causing or experiencing interference on the affected resources, rather than broadcasting to all UEs. This targeted approach reduces signaling overhead while still achieving effective interference mitigation where needed.
Data Source
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AI summary
Methods, systems, and devices for wireless communications are described. A base station may identify one or more first user equipments (UEs) that have been configured for grant-free transmissions on an allocation of resources. In some cases, the base station may then schedule an uplink transmission for a second UE on resources that overlap the allocation of resources. Accordingly, the base station may transmit a power adjustment indication (PAI) to the one or more first UEs to adjust a transmit power for uplink transmissions on the overlapping resources. In some cases, the PAI may include an indication of frequency-domain resources for the power adjustment indicated in the PAI, a specified time duration for the power adjustment indicated in the PAI, an indication of specific uplink transmissions to which the transmit power adjustment is to be applied, or a combination thereof.