Terminal Transmission Power Control for Intra-Band Contiguous Carrier Aggregation
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Solution Overview
Problem
In 3GPP LTE systems, reducing transmission power to minimize interference between adjacent frequency bands while maintaining service coverage is challenging, as simply reducing power can lead to decreased coverage and interference issues persist due to adjacent frequency band usage by different service providers.
Innovation Solution
A method and terminal implementation that applies an additional maximum power reduction (A-MPR) based on carrier aggregation configurations, specifically for intra-band contiguous CA scenarios, by adjusting transmission power based on aggregated bandwidth and resource block length to minimize interference without compromising service coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If transmission power is reduced to minimize interference between adjacent frequency bands, then interference is reduced, but service coverage is also reduced
Solution Approach 1:
The patent applies additional maximum power reduction (A-MPR) as a parameter adjustment to transmission power levels. By dynamically adjusting the transmission power reduction based on carrier aggregation configurations and resource block allocations, the system minimizes interference to adjacent bands while maintaining adequate service coverage through optimized power parameters.
Solution Approach 2:
The patent implements differential power reduction strategies for different resource block allocations and carrier aggregation scenarios. By applying A-MPR selectively based on local conditions (contiguous vs. non-contiguous CA, different bandwidth configurations), the system achieves interference mitigation in specific frequency regions while preserving coverage in other areas.
2Object-affected harmful factors
If frequency intervals between adjacent bands are increased to eliminate interference, then interference is eliminated, but transmission resources are reduced
Solution Approach 1:
Instead of increasing frequency intervals, the patent changes the transmission power parameter by applying A-MPR. This allows adjacent frequency bands to remain closely spaced (maximizing resource availability) while controlling interference through power adjustment rather than frequency separation.
3Object-affected harmful factors
If transmission power is reduced simply, then interference is reduced, but service coverage is significantly compromised
Solution Approach 1:
The patent implements dynamic A-MPR adjustments based on real-time carrier aggregation configurations and resource block allocations. Rather than applying a fixed power reduction, the system dynamically adapts the transmission power reduction level to maintain reliability while minimizing interference, making the power control flexible and context-aware.
Solution Approach 2:
The patent applies partial power reduction through A-MPR rather than complete or excessive power reduction. By applying only the necessary amount of power reduction (additional maximum power reduction) based on specific scenarios, the system achieves interference mitigation without overly compromising service coverage.
Data Source
AI summary
There is provided a method of reducing transmission power. The method may comprise: receiving a network signal, if a carrier aggregation (CA) is configured and if the configured CA corresponds to an intra-band contiguous CA; applying an additional maximum power reduction (A-MPR) for a transmission, based on the network signal. If a configuration of the CA corresponds to a CA_1C and if the aggregated transmission bandwidth is the summation of 75 RBs and 75 RBs, a value of the A-MPR is specified for L_CRB>10. The L_CRB is a length of a contiguous resource block allocation.