LTE UE EPDCCH PMCH Subframe Segmentation

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

In LTE wireless communication systems, there is a need to manage collisions between the enhanced physical downlink control channel (EPDCCH) and the physical multicast channel (PMCH) to prevent interference and optimize channel usage.

Innovation Solution

A method and apparatus for determining whether to process the EPDCCH or a signal of a service in a subframe, prioritizing EPDCCH over PMCH to avoid collisions, and communicating accordingly, allowing for efficient channel management and interference avoidance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the UE processes both EPDCCH and PMCH in the same subframe, then channel utilization is maximized, but collisions and interference occur between the channels

Engineering Contradiction:

Improvechannel utilizationVSAvoidchannel collision avoidance

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent segments the subframe into distinct processing regions by dividing the set of subframes into first subframes dedicated for PMCH processing and second subframes dedicated for EPDCCH processing. This temporal segmentation prevents channel collisions while maintaining high overall channel utilization across the subframe sequence.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements dynamic subframe assignment where the UE can be configured with different subframe patterns for PMCH and EPDCCH based on network conditions and service requirements. This dynamic allocation allows the system to adaptively balance between channel utilization and collision avoidance.

Inventive Principle:

Principle #15Dynamics

2Reliability

If the UE prioritizes EPDCCH processing over PMCH, then control channel reliability is improved, but multicast service signal processing may be delayed or lost

Engineering Contradiction:

Improvecontrol channel processingVSAvoidmulticast service processing

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent segments subframes into control-oriented (second subframes) and service-oriented (first subframes) categories, ensuring that when EPDCCH processing is prioritized in control subframes, multicast services are guaranteed dedicated service subframes for processing, thus maintaining both control reliability and service productivity.

Inventive Principle:

Principle #1Segmentation

3Productivity

If the UE prioritizes PMCH processing over EPDCCH, then multicast service delivery is improved, but control channel collisions increase

Engineering Contradiction:

Improvemulticast service deliveryVSAvoidcontrol channel collision avoidance

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent segregates PMCH and EPDCCH into different subframe categories (first subframes for PMCH, second subframes for EPDCCH), allowing multicast service delivery to proceed without control channel interference in service subframes while ensuring control channels have dedicated collision-free subframes.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS10849112B2Processing PMCH and EPDCCH in LTE

Publication Date: 2020.11.24 QUALCOMM INC

AI summary

Methods and apparatuses are provided for resolving collisions between a multicast channel (such as a physical multicast channel (PMCH)) and a control channel (such as an enhanced physical downlink control channel (EPDDCH)) in a wireless network, such as LTE. In an aspect, a UE determines whether to process an enhanced physical downlink control channel (EPDCCH) or a signal of a service in a subframe. The UE communicates in accordance with the determination.