Rate Matching SPS Data Around Cell-Specific Reference Signals

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Solution Overview

Problem

Existing wireless communication systems face challenges in avoiding collisions between semi-persistent scheduling (SPS) data transmissions and cell-specific reference signals (CRS) in resource-limited environments.

Innovation Solution

The method involves configuring semi-persistent scheduling (SPS) data transmissions to rate-match around resource elements used for CRS patterns, thereby avoiding collisions. This is achieved by determining the resource elements for the CRS pattern and configuring the SPS data transmission to utilize non-overlapping resource elements.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If SPS data transmissions are configured without rate matching around CRS resource elements, then resource utilization is improved, but collisions between SPS transmissions and CRS occur causing degradation in communication reliability

Engineering Contradiction:

Improvecommunication reliabilityVSAvoidresource utilization

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The resource elements are segmented into CRS resource elements and non-CRS resource elements. The SPS data transmission is configured to use only non-CRS resource elements through rate matching, thereby avoiding collisions while maintaining reliable communication.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different quality requirements are applied to different resource elements. CRS resource elements are protected from SPS transmissions to ensure reference signal quality, while other resource elements can be utilized for data transmission to maintain system productivity.

Inventive Principle:

Principle #3Local quality

2Reliability

If SPS data transmissions rate match around CRS resource elements, then collisions are avoided improving reliability, but available resource elements for data transmission are reduced

Engineering Contradiction:

Improvetransmission reliabilityVSAvoidavailable resource elements

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

Instead of excluding all resource elements, only the specific CRS resource elements are excluded from SPS transmissions. This partial exclusion approach maintains transmission reliability while preserving the majority of resource elements for data transmission.

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The SPS configuration parameters are adjusted to incorporate rate matching around CRS resource elements. By changing the resource allocation parameters, the system achieves reliable transmissions without permanently losing resource elements, as they can be used for other purposes.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12309780B2Avoiding collisions with reference signals

Publication Date: 2025.05.20 QUALCOMM INC

AI summary

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a configuration for a semi-persistent scheduling (SPS) of a data transmission that rate matches the data transmission around one or more resource elements that are to be used for a cell-specific reference signal pattern. The UE may receive an SPS communication based at least in part on the configuration. Numerous other aspects are provided.