SRS Collision Handling via UE-Specific Cell ID and Power Offsets

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Solution Overview

Problem

In wireless communication systems, particularly in LTE, there is a need to handle collisions between first and second sounding reference signals (SRS) that are transmitted in the same cell, where both SRS configurations may have the same type or different UE-specific cell identifications and power offsets, posing challenges for effective SRS operation.

Innovation Solution

A method and apparatus for wireless communication that receive configurations for first and second SRS, determining how to handle collisions by modifying transmission timing, prioritizing based on SRS parameters, or maintaining orthogonal transmissions, ensuring that SRS transmissions do not overlap and optimizing power management across different antenna ports.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If multiple SRS configurations are transmitted in the same cell with same type and different UE-specific cell identifications, then SRS transmission flexibility is improved, but collision between SRS transmissions occurs

Engineering Contradiction:

ImproveSRS transmission flexibilityVSAvoidSRS transmission reliability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent segments SRS transmissions by introducing different UE-specific cell identifications for different SRS configurations. This allows the system to maintain multiple SRS configurations (improving flexibility) while distinguishing them through unique identifiers, thereby preventing collisions and maintaining reliability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies local quality by assigning different power offsets to different SRS configurations based on their specific requirements. This allows each SRS transmission to have optimized local parameters (power levels) while maintaining overall system coordination, preventing collisions through differentiated transmission characteristics.

Inventive Principle:

Principle #3Local quality

2Manufacturing precision

If SRS collision handling is implemented with different power offsets, then power management precision is improved, but device complexity increases

Engineering Contradiction:

Improvepower management precisionVSAvoidconfiguration management complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent changes power parameters by introducing configurable power offsets for different SRS configurations. This allows precise control over transmission power for each configuration, improving power management precision. The parameters are configured through standardized signaling mechanisms, which manages the complexity through systematic parameterization.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS9204434B2Enhanced sounding reference signal (SRS) operation

Publication Date: 2015.12.01 QUALCOMM INC

AI summary

A method of wireless communication includes determining how to handle a collision between the first sounding reference signal (SRS) and a second SRS when the second SRS may the same type as the first SRS and when both the first SRS and the second SRS may be transmitted in a same cell. The method also includes transmitting the first SRS and the second SRS based on a received first and second configuration for SRSs. The first configuration includes a first UE specific cell identification that differs from a second UE specific cell identification of the second configuration and/or a first power offset that differs from a second power offset of the second configuration.