Inter-cell Coordination for PAPR Reduction Beam Optimization
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Solution Overview
Problem
Wireless communication systems, particularly MIMO-OFDM, face challenges with high peak-to-average power ratio (PAPR) due to signal interference and power variations, leading to inefficient transmitter operation and interference with neighboring cells.
Innovation Solution
Implement inter-cell coordination by having an interfering base station transmit measurement configurations to neighboring base stations, which relay these to user equipment (UEs) for energy measurements. The headroom reports from UEs are then used to adjust PAPR reduction beams, optimizing their power and timing to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If PAPR reduction beams are transmitted to reduce peak-to-average power ratio, then transmitter power efficiency is improved, but interference to neighboring cells increases
Solution Approach 1:
The patent implements a feedback mechanism where neighboring base stations measure the interference caused by PAPR reduction beams and report headroom information to the transmitting base station. The transmitting base station then adjusts the PAPR reduction beam power based on this feedback, dynamically balancing power efficiency with interference mitigation.
Solution Approach 2:
The patent dynamically adjusts the power parameter of PAPR reduction beams based on headroom reports from neighboring cells. By changing the transmission power parameter adaptively rather than using fixed power levels, the system optimizes transmitter efficiency while preventing excessive interference to neighboring base stations.
2Object-generated harmful factors
If inter-cell coordination is implemented to measure and adjust PAPR beams, then interference mitigation is improved, but system complexity increases
Solution Approach 1:
The patent uses headroom reports as an intermediary mechanism to facilitate coordination between base stations. Instead of direct complex interference management, the system employs standardized measurement and reporting procedures that simplify inter-cell coordination while achieving effective interference mitigation.
Solution Approach 2:
The patent performs preliminary measurements of PAPR reduction beam interference at neighboring base stations before final beam transmission optimization. By conducting measurements and obtaining headroom reports in advance, the system can pre-adjust beam parameters to avoid excessive interference, simplifying the overall coordination process.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. An interfering base station may transmit to a neighboring base station a configuration to measure beam resources for a plurality of PAPR reduction beams. The neighboring base station may forward this measurement configuration to an associated UE. The UE may then take measurements of the interfering base station's PAPR reduction beams in accordance with the configuration and transmit the report to its serving base station. The neighboring base station may then compile a headroom report and transmit the headroom report to the interfering base station. The interfering base station may then adjust its PAPR reduction beams based on the headroom report.