ePDCCH Start Position Determination for LTE Interference Reduction

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Solution Overview

Problem

The existing technologies do not effectively address the intra-cell interference caused by the sending of enhanced Physical Downlink Control Channel (ePDCCH) in control channels, which affects the efficiency of downlink transmission in LTE/LTE-A systems.

Innovation Solution

Determining the start position of ePDCCH in a subframe using high-level signaling or preset rules, and configuring pilot signals and data power to minimize interference, thereby eliminating intra-cell interference and improving transmission efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If ePDCCH is sent in control channels using existing technologies, then downlink transmission can be performed, but intra-cell interference occurs in control channels

Engineering Contradiction:

Improvedownlink transmission efficiencyVSAvoidintra-cell interference in control channels

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent applies preliminary action by determining the start position of ePDCCH in advance using high-level signaling or preset rules before actual transmission. This pre-determination allows the system to configure pilot signals and data power appropriately to minimize interference from the outset, rather than dealing with interference after it occurs. The start position is determined before the subframe transmission begins, enabling proactive interference management.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent employs parameter changes by adjusting the start position parameter of ePDCCH within the subframe based on high-level signaling or preset rules. By changing this temporal parameter, the system can optimize the positioning of ePDCCH to avoid interference with other control channels while maintaining downlink transmission efficiency. The configuration of pilot signals and data power also involves parameter adjustments to minimize interference.

Inventive Principle:

Principle #35Parameter changes

2Object-affected harmful factors

If the start position of ePDCCH is not accurately determined, then configuration is simpler, but transmission interference increases and efficiency decreases

Engineering Contradiction:

Improvetransmission interferenceVSAvoidconfiguration complexity for determining start position

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent applies universality by using high-level signaling that can serve multiple purposes: it indicates the start position of ePDCCH, configures pilot signals, and sets data power parameters all through a unified signaling mechanism. This multi-functional approach reduces the need for separate configuration procedures while achieving accurate start position determination and interference minimization simultaneously.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentEP2775768B1Determination of the starting position of the e-pdcch

Publication Date: 2019.04.03 ZTE CORP

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AI summary

Disclosed in the present invention are a sending method and apparatus for enhanced physical downlink control channel. The method comprises: a start position of the ePDCCH in a subframe is determined according to a high-level signaling and/or preset rule; and a pilot signal for ePDCCH and data carried on the ePDCCH are sent. By applying the present invention, the interference between the ePDCCH and the downlink control channel is reduced, and the efficiency of downlink transmission is improved.