Flexible Search Space Configuration for DCI Detection

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Solution Overview

Problem

The existing LTE system has limited flexibility in configuring search spaces for downlink control information (DCI), which restricts data transmission with varying time intervals (TTI lengths) and scheduling priorities, leading to inefficient data scheduling and increased processing complexity for terminal devices.

Innovation Solution

The method involves determining multiple search spaces within a time window, allowing terminal devices to detect and network devices to send DCI in different search spaces, each configured for specific TTI lengths, thereby enabling flexible scheduling of data transmissions with varying priorities.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a single search space is configured in existing LTE systems, then the system structure is simple, but the flexibility for data transmission with varying TTI lengths and scheduling priorities is poor

Engineering Contradiction:

Improveflexibility of search space configurationVSAvoidsearch space configuration complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent divides a single search space into multiple search spaces, where each search space is configured for specific TTI lengths and scheduling priorities. This segmentation allows the system to handle different data transmission requirements independently, improving adaptability while maintaining manageable complexity through structured organization.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces dynamic search space configuration where search spaces can be activated or deactivated based on service requirements and scheduling priorities. This dynamic approach enables the system to adapt to varying TTI lengths and traffic patterns, transforming the static single search space into a flexible multi-search space structure.

Inventive Principle:

Principle #15Dynamics

2Adaptability or versatility

If multiple search spaces are configured for different TTI lengths and scheduling priorities, then data transmission flexibility is improved, but terminal device processing complexity increases

Engineering Contradiction:

Improvedata transmission flexibilityVSAvoidterminal device processing complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent assigns different properties to different search spaces, such as specific TTI lengths, scheduling priorities, and service types. Each search space is optimized for its specific purpose, allowing terminal devices to process only relevant search spaces based on their service requirements, thereby reducing overall processing complexity while maintaining transmission flexibility.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent allows terminal devices to selectively monitor and process only the search spaces that are relevant to their specific service requirements and scheduling priorities, rather than processing all search spaces. This partial action approach reduces processing complexity while maintaining the flexibility benefits of multiple search spaces.

Inventive Principle:

Principle #16Partial or excessive action

3Adaptability or versatility

If search spaces are configured for multiple TTI lengths, then support for diverse data transmission scenarios is improved, but the number of search spaces and configuration parameters increases

Engineering Contradiction:

Improvesupport for diverse data transmission scenariosVSAvoidnumber of search spaces and configuration parameters

Core Design Contradiction:

Adaptability or versatilityVSQuantity of substance

Solution Approach 1:

The patent designs search spaces with universal structures that can serve multiple functions. Each search space is configured to handle different TTI lengths and scheduling priorities using a standardized configuration framework, reducing the need for entirely separate configurations for each scenario and thereby limiting the increase in the number of parameters.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent uses parameter-based configuration where search spaces are differentiated by specific parameters such as TTI length, scheduling priority, and service type. By changing these parameters rather than creating entirely separate search space structures, the system supports diverse data transmission scenarios while controlling the overall configuration complexity.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS10631327B2Downlink control information detection method, downlink control information sending method, and apparatus

Publication Date: 2020.04.21 HUAWEI TECH CO LTD

AI summary

A downlink control information (DCI) detection method is provided, including: determining, by a terminal device, at least one of a first search space and a second search space, where the first search space is in a first time unit of a first time unit set, the second search space is in a second time unit of a second time unit set, the first time unit set and the second time unit set are subsets of the NT time units included in a time window T, NT is an integer and NT≥2, the first time unit set and the second time unit set overlap; and detecting, by the terminal device, at least one piece of DCI in the at least one search space. According to the foregoing method, a search space can be flexibly configured and DCI can be flexibly transmitted.