Downlink Power Grouping by Frequency Separation From Uplink
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Solution Overview
Problem
In wireless communication systems, concurrent downlink and uplink transmissions at similar or close frequencies often interfere with each other, leading to reduced quality and range of downlink transmissions while increasing interference on uplink channels.
Innovation Solution
A base station assigns different transmit power levels for downlink transmissions based on the frequency separation from the uplink frequency region, using a transmit power gradient to minimize interference and maintain reception quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station transmits downlink signals at high power levels to maintain downlink transmission quality, then downlink transmission quality is improved, but interference on uplink channels increases
Solution Approach 1:
The base station applies different transmit power levels to different downlink transmissions based on their frequency proximity to uplink channels. Specifically, DL transmissions closer in frequency to UL channels are transmitted at lower power levels, while those farther away are transmitted at higher power levels. This local differentiation of power quality resolves the contradiction by reducing interference only where necessary (near UL frequencies) while maintaining high power (and thus high quality) for DL transmissions that do not interfere with UL channels.
2Object-generated harmful factors
If the base station reduces downlink transmit power to minimize interference on uplink channels, then interference on uplink channels is reduced, but downlink transmission quality deteriorates
Solution Approach 1:
Instead of uniformly reducing power across all downlink transmissions, the base station selectively reduces power only for those DL transmissions that are close in frequency to UL channels. This targeted approach ensures that interference on UL channels is minimized only where frequency overlap occurs, while DL transmission quality is maintained at high power levels for all other DL transmissions that do not cause interference.
3Device complexity
If the base station uses uniform transmit power for all downlink transmissions, then device complexity is reduced, but inter-channel interference cannot be effectively managed
Solution Approach 1:
The base station changes the power level parameter dynamically based on the frequency separation between downlink transmission resources and uplink frequency regions. The patent implements a power assignment mechanism where the Tx power for each DL resource assignment is adjusted according to its frequency distance from UL channels. This parameter change approach enables effective interference management without requiring complex spatial or temporal resource allocation schemes.
Data Source
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AI summary
Aspects of the disclosure relate to downlink (DL) transmissions using various powers and assigning frequency resources based on the powers. An example base station may transmit, to a first user equipment (UE), an indication of a first transmit (Tx) power for a first DL transmission on a first downlink (DL) resource on a carrier, the first DL resource being at a first frequency. The first DL resource may be at a first frequency. The first Tx power may have a power level configured based on a difference between the first frequency for the first DL resource and an uplink (UL) frequency region of the carrier. Then, the base station may transmit the first DL transmission using the first frequency and the first Tx power. Other aspects, embodiments, and features are also claimed and described.