SRS Port Mapping for Power Restricted Antennas

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Solution Overview

Problem

Existing reference signal transmission methods, such as SRS, face challenges in managing output power restrictions for user equipment (UE) antennas, particularly when transmitting towards sensitive objects like the human body, which can lead to reduced link budget and inaccurate channel estimation.

Innovation Solution

Implementing a power management parameter, like P-MPR, to dynamically adjust the mapping of SRS ports to antennas, allowing for varying transmit power across different antennas to optimize the SRS link budget and minimize the impact of power restrictions, thereby improving channel estimation and transmission quality.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If output power is restricted for antennas transmitting towards sensitive objects, then safety requirements are met, but link budget and channel estimation accuracy deteriorate

Engineering Contradiction:

Improvetransmission towards sensitive objectsVSAvoidlink budget and channel estimation

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent segments the reference signal transmission by antenna port, allowing different power management parameters to be applied to different antenna ports. This enables selective power restriction on antennas transmitting towards sensitive objects while maintaining full power on other antennas, thus resolving the contradiction between safety requirements and link budget maintenance

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies local quality by assigning different power management parameters (P-MPR values) to different antenna ports based on their specific transmission characteristics and sensitivity considerations. This localized approach allows each antenna port to operate with appropriate power levels, optimizing both safety compliance and transmission performance for each specific antenna

Inventive Principle:

Principle #3Local quality

2Device complexity

If uniform power management parameter is applied to all antennas, then implementation is simplified, but transmission quality and link budget optimization are reduced

Engineering Contradiction:

Improvepower management implementationVSAvoidtransmission quality and link budget

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent introduces dynamic power management by allowing the network to configure different power management parameters for different antenna ports and by enabling the UE to determine P-MPR values based on detected sensitive objects. This dynamic approach optimizes transmission quality and link budget while maintaining reasonable implementation complexity through standardized procedures

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS20230209478A1Emission restricted transmission of reference signals

Publication Date: 2023.06.29 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

A user equipment (UE) determines a power management parameter for at least one of its antennas, maps transmit ports to antennas based at least in part on the power management parameter, and transmits a set of references signals on the antennas according to the mapping.