Flexible Resource Allocation for Intra-Cell Interference Cancellation

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Solution Overview

Problem

In LTE-A networks, co-channel and intra-cell interference limit network capacity, particularly in high-density deployments, where existing interference mitigation techniques are insufficient due to residual intra-cell interference in MU-MIMO systems.

Innovation Solution

A flexible resource allocation method is introduced, where resource allocations are split into smaller sub-blocks to align boundaries, enabling efficient code word level interference cancellation (CWIC) without constraining eNB scheduling, using multiple DCIs with CRC scrambled by C-RNTI to indicate sub-block boundaries and bundling ACK/NACK reports across sub-blocks.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If resource allocations are split into smaller sub-blocks to align boundaries for CWIC, then interference cancellation performance is improved, but device complexity and processing overhead increase

Engineering Contradiction:

Improveinterference cancellation performanceVSAvoidprocessing overhead

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The resource allocation is segmented into smaller sub-blocks with aligned boundaries between serving and interfering layers. This segmentation enables the CWIC receiver to process interference cancellation at code word level for each sub-block, improving interference cancellation performance while managing complexity through structured division of the resource allocation.

Inventive Principle:

Principle #1Segmentation

2Adaptability or versatility

If multiple DCIs are used to indicate sub-block boundaries, then resource allocation flexibility is improved, but control signaling overhead increases

Engineering Contradiction:

Improveresource allocation flexibilityVSAvoidcontrol signaling overhead

Core Design Contradiction:

Adaptability or versatilityVSQuantity of substance

Solution Approach 1:

Multiple DCIs are used to convey multiple functions: they indicate sub-block boundaries for CWIC processing and carry scheduling information for different resource allocation sub-blocks. This multi-functionality approach provides resource allocation flexibility while managing control signaling overhead by consolidating information transmission.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Device complexity

If ACK/NACK reports are bundled across sub-blocks, then processing overhead is reduced, but feedback precision is reduced

Engineering Contradiction:

Improveprocessing overheadVSAvoidfeedback precision

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

ACK/NACK reports from multiple resource allocation sub-blocks are bundled and transmitted together in a single uplink transmission. This merging reduces processing overhead and uplink signaling complexity while maintaining adequate feedback precision for the overall resource allocation, as the bundled report provides comprehensive acknowledgment status.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS9603140B2Resource allocation

Publication Date: 2017.03.21 APPLE INC

AI summary

Device, system and methods for flexible resource allocation are described. In particular, there is described a user receive a user equipment configured to receive higher-layer configuration of flexible resource allocation; receive dynamic information on the downlink resource allocation in a given downlink (DL) subframe; split the resource allocation into resource allocation sub-blocks; independently decode physical downlink shared channel (PDSCH) within each resource allocation sub-block; AND report ACK/NACK for the resource allocation.