Divided Spectrum Antenna Mapping for MPE-Limited Wireless Power
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Solution Overview
Problem
Wireless communications systems face challenges in increasing transmit power while adhering to maximum permissible exposure (MPE) thresholds, leading to reduced coverage and communication quality.
Innovation Solution
Implementing an antenna structure that divides the channel bandwidth into multiple subbands based on a set of antennas, allowing increased transmission power while conforming to MPE thresholds, and using control signaling to map antennas to subbands for improved communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If transmit power is increased to improve coverage and communication quality, then EIRP increases, but MPE thresholds are exceeded causing harmful effects
Solution Approach 1:
The patent segments the frequency spectrum into multiple subbands and divides the antenna array into multiple groups, where each group transmits on a different subband. This segmentation allows the system to achieve higher total EIRP by activating more antenna groups across different frequency bands while keeping the power density in any single location (and thus MPE compliance) manageable through frequency division.
2Power
If antenna array is used to increase EIRP, then transmission power increases, but grating lobes are generated causing interference
Solution Approach 1:
The patent segments the antenna array into multiple groups with different spatial positions and assigns each group to transmit on different subbands. This segmentation in both frequency and spatial domains prevents grating lobes from interfering with each other, as each antenna group operates on a distinct frequency band, thereby enabling high EIRP without grating lobe interference.
Solution Approach 2:
The patent converts the potential harmful grating lobes generated by high-power antenna arrays into beneficial directional transmissions by carefully designing the antenna group configurations and their corresponding subband assignments. The grating lobes that would normally cause interference are instead utilized to provide spatial diversity and reduce mutual interference between antenna groups operating on different frequencies.
3Object-affected harmful factors
If channel bandwidth is divided into multiple subbands, then MPE compliance is improved, but system complexity increases
Solution Approach 1:
The patent implements dynamic subband allocation and antenna group assignment based on real-time channel conditions and MPE requirements. The system can adaptively adjust which antenna groups transmit on which subbands, providing flexibility to meet MPE constraints while optimizing communication performance. This dynamic approach manages complexity through adaptability rather than fixed rigid configurations.
Solution Approach 2:
The patent utilizes parameter changes in the frequency domain by dividing the channel bandwidth into multiple subbands with different carrier frequencies. This frequency parameter division allows the system to transmit at higher powers on different subbands while maintaining MPE compliance through frequency separation, effectively managing the complexity-MPE tradeoff.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may transmit signaling that may indicate a capability of the UE to support a divided spectrum for communications between the UE and a network entity. The divided spectrum may include division of a channel bandwidth into multiple of subbands according to a quantity of antennas at the UE. The UE may receive control signaling that may includes a division pattern that is based on the capability of the UE, where the division pattern may indicate the division of the channel bandwidth into the multiple subbands and may indicate a mapping between the antennas of the UE and the multiple subbands. Accordingly, the UE may communicate with the network entity via the antennas across the multiple subbands according to the division pattern.