Dynamic NAICS Signaling via Distinct Scrambling IDs

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Solution Overview

Problem

In wireless communication networks, especially in LTE-Advanced, existing technologies face challenges in efficiently managing interference between user equipment (UEs) due to the complexity of blind decoding and information overhead in Network Assisted Interference Cancellation & Suppression (NAICS), particularly in dynamic scheduling scenarios where semi-static parameters are involved.

Innovation Solution

The system transmits both downlink control information associated with a victim UE and interfering UEs in the same or overlapping candidate search spaces, using distinct scrambling identifications to facilitate decoding, thereby reducing the need for blind decoding and optimizing interference cancellation by providing dynamic assistance information.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If semi-static parameters are used for NAICS assistance information, then interference cancellation can be implemented, but the information overhead and blind decoding complexity increase for victim UEs

Engineering Contradiction:

Improveinterference cancellation efficiencyVSAvoidblind decoding complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent segments the NAICS assistance information into two distinct parts: semi-static parameters (transmitted via RRC signaling) and dynamic parameters (transmitted via PDCCH/EPDCCH). This segmentation allows the victim UE to handle different types of parameters through different decoding mechanisms, reducing overall blind decoding complexity while maintaining interference cancellation efficiency.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies preliminary action by transmitting semi-static NAICS parameters in advance through RRC signaling before dynamic scheduling occurs. This preliminary transmission of static parameters reduces the burden on dynamic blind decoding processes, as these parameters are already available when dynamic interference cancellation is needed.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If dynamic parameters are blindly decoded by victim UE, then interference cancellation can be performed, but information overhead and processing complexity increase

Engineering Contradiction:

Improveinterference cancellation capabilityVSAvoidinformation overhead

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The patent segments information transmission by separating static NAICS parameters (sent via RRC) from dynamic parameters (sent via PDCCH/EPDCCH). This reduces information overhead because static parameters are transmitted once and reused, while only dynamic parameters require repeated transmission with each scheduling decision.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent uses copying by transmitting the same semi-static NAICS parameters multiple times through different channels (RRC signaling and embedded in PDCCH/EPDCCH). This ensures the victim UE has the necessary information without requiring full repetition of all parameters in every dynamic transmission, reducing overall information overhead.

Inventive Principle:

Principle #26Copying

3Ease of operation

If subset restrictions are employed at interferer cell, then blind decoding is facilitated, but scheduling flexibility is reduced

Engineering Contradiction:

Improveblind decoding easeVSAvoidscheduling flexibility

Core Design Contradiction:

Ease of operationVSAdaptability or versatility

Solution Approach 1:

The patent applies dynamics by transmitting subset restriction information dynamically through PDCCH/EPDCCH rather than fixing it through semi-static RRC signaling. This allows the interferer cell to adjust subset restrictions in real-time based on current scheduling conditions, maintaining both blind decoding ease and scheduling flexibility.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent uses preliminary action by providing subset restriction information in advance through RRC signaling, which establishes a baseline for blind decoding. Additional dynamic subset information is then provided through PDCCH/EPDCCH to maintain flexibility without overwhelming the UE with information.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS10136420B2Methods and systems for signaling dynamic network assisted information to a user equipment

Publication Date: 2018.11.20 ALCATEL LUCENT SA

AI summary

At least one example embodiment discloses a system including a network element configured to transmit at least first downlink control information and second downlink control information to a first user equipment (UE) being served by a serving cell, the first downlink control information associated with a first identification and the second downlink control information associated with a second identification, and the second downlink control information corresponding to at least one interfering source.