Uplink Power Control for Inter-Subband CLI Reduction
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Solution Overview
Problem
In wireless communication networks operating in subband non-overlapping full duplex mode, inter-subband cross-link interference (CLI) occurs due to simultaneous uplink (UL) and downlink (DL) transmissions, which reduces network performance.
Innovation Solution
The implementation of a user equipment (UE) with a processor configured to receive a UL grant scheduling PUSCH transmissions, determine if resource blocks (RBs) belong to a second set of edge RBs, and select power-control parameter sets to calculate appropriate transmission powers, thereby managing inter-subband CLI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If subband non-overlapping full duplex mode is implemented to allow simultaneous UL and DL transmissions, then network coverage and latency are improved, but inter-subband cross-link interference (CLI) occurs between devices
Solution Approach 1:
The patent applies local quality by differentiating power control parameters for different resource block (RB) locations within a subband. Specifically, edge RBs (those adjacent to DL subbands) are assigned different power control parameters compared to non-edge RBs. This localized differentiation allows the system to maintain full duplex operation while reducing CLI specifically at the problematic edge regions where UL transmissions interfere with adjacent DL subbands.
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting power control parameters (such as P0, alpha, and other power adjustment factors) based on the RB's position within the subband. The network configures multiple power control parameter sets and指示es the UE to select appropriate parameters based on whether the scheduled RBs are edge RBs or non-edge RBs. This parameter adaptation enables the system to reduce transmission power at edge RBs to minimize CLI while maintaining adequate power for non-edge RBs.
2Area of stationary object
If transmission power is increased to improve coverage, then network coverage is enhanced, but inter-subband CLI increases
Solution Approach 1:
The patent applies local quality by differentiating power control parameters for different resource block (RB) locations within a subband. Specifically, edge RBs (those adjacent to DL subbands) are assigned different power control parameters compared to non-edge RBs. This localized differentiation allows the system to maintain full duplex operation while reducing CLI specifically at the problematic edge regions where UL transmissions interfere with adjacent DL subbands.
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting power control parameters (such as P0, alpha, and other power adjustment factors) based on the RB's position within the subband. The network configures multiple power control parameter sets and指示es the UE to select appropriate parameters based on whether the scheduled RBs are edge RBs or non-edge RBs. This parameter adaptation enables the system to reduce transmission power at edge RBs to minimize CLI while maintaining adequate power for non-edge RBs.
Data Source
AI summary
Disclosed are methods and apparatuses for uplink transmission power control. An embodiment of the subject application provides a user equipment (UE). The UE includes: a processor and a wireless transceiver coupled to the processor, wherein the processor is configured to: receive, with the wireless transceiver, a uplink (UL) grant scheduling at least one Physical Uplink Shared Channel (PUSCH) transmission occupying a first set of resource blocks (RBs) consisting of a first number of RBs; determine whether there is at least one RB of the first set of RBs belongs to a second set of RBs; select at least one power-control parameter set from at least two power-control parameter sets for each of the at least one PUSCH transmission based on the determination; and calculate one or more transmission powers for each of the at least one PUSCH transmission based on the at least one selected power-control parameter set.