D2D Scheduling Assignment Resource Allocation via Segmentation

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Solution Overview

Problem

Current D2D communication systems face challenges in efficiently managing scheduling assignments (SAs) for resource allocation, particularly in Mode 1 and Mode 2 communications, where the number of SA resource patterns exceeds the 6-bit SA resource index limit, leading to overlapping resources and increased UE decoding complexity.

Innovation Solution

A method for determining SA resource patterns based on available resources, allowing each pattern to refer to distinct allocated resources for communication with a respective UE, utilizing frequency hopping and time hopping for orthogonal resource partitioning, and employing a UE-specific parameter to manage resource allocation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the number of SA resource patterns is increased to support more UEs, then the resource allocation capacity is improved, but the SA resource index limit (6-bit) is exceeded causing overlapping resources and increased UE decoding complexity

Engineering Contradiction:

Improveresource allocation capacityVSAvoidUE decoding complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent segments the SA resource patterns into multiple groups, where each group can be independently indicated by a 6-bit SA resource index. This segmentation allows the system to support more resource patterns (beyond the 64 patterns that can be indicated by a single 6-bit index) by using multiple groups, thereby resolving the contradiction between resource allocation capacity and UE decoding complexity.

Inventive Principle:

Principle #1Segmentation

2Adaptability or versatility

If SA resources are allocated for multiple UEs, then the communication coverage is improved, but resource overlap occurs due to the 6-bit index limit

Engineering Contradiction:

Improvecommunication coverageVSAvoidresource allocation accuracy

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent divides SA resource patterns into multiple groups to enable unique identification of each pattern. By segmenting the resource patterns and providing separate group indications, the system ensures that each UE can be allocated distinct SA resources without overlap, even when supporting multiple UEs, thus maintaining resource allocation accuracy while expanding communication coverage.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces an additional dimension for resource identification by using both a group index and a pattern index within the group. This two-dimensional indexing approach (group dimension + pattern dimension) allows the system to uniquely identify more resource patterns than a single 6-bit index could provide, eliminating resource overlap while supporting multiple UEs.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Data Source

PatentUS11039461B2Method and device of resource allocations for scheduling assignments in device to device communications

Publication Date: 2021.06.15 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

Methods and devices for scheduling assignment resource patterns determining are provided. Mappings of scheduling assignment resource patterns to scheduling assignment resource pool in a device 5 to device, D2D, communication network are given. The way to notify a D2D device of the resource pattern for using is also given.