Cross-BWP Scheduling for Limited Capability Terminals

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Solution Overview

Problem

Limited capability terminal devices, such as NR light terminal devices and RedCap terminal devices, face challenges in implementing PDSCH scheduling due to their restricted bandwidth for reception, making it difficult to monitor PDCCHs.

Innovation Solution

A data transmission method where a terminal device monitors a first PDCCH in a first bandwidth part and receives a PDSCH in a second bandwidth part based on the first PDCCH, with the bandwidth of the first PDCCH located within the terminal device's receiving bandwidth, enabling PDSCH scheduling across bandwidth parts.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If PDCCH and PDSCH are transmitted in the same bandwidth for normal terminal devices, then scheduling efficiency is improved, but limited capability terminal devices cannot receive the signals due to bandwidth restrictions

Engineering Contradiction:

Improvescheduling efficiencyVSAvoidcompatibility with limited capability terminal devices

Core Design Contradiction:

ProductivityVSAdaptability or versatility

Solution Approach 1:

The patent divides the bandwidth into multiple bandwidth parts (BWPs), with a first BWP for control channel transmission and a second BWP for data channel transmission. This segmentation allows different terminal types to operate in their respective appropriate bandwidth ranges, resolving the contradiction between scheduling efficiency and device compatibility.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent creates a universal scheduling mechanism where a PDCCH in one BWP can schedule a PDSCH in another BWP. This multi-functional approach allows the same scheduling mechanism to serve both normal terminal devices (which can receive across full bandwidth) and limited capability terminal devices (which operate in restricted bandwidth), achieving both high productivity and broad adaptability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If the bandwidth of PDCCH is expanded to match PDSCH bandwidth, then resource allocation flexibility is improved, but limited capability terminal devices with restricted receiving bandwidth cannot monitor the PDCCH

Engineering Contradiction:

Improveresource allocation flexibilityVSAvoidPDCCH monitoring capability for limited capability terminal devices

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The patent segments the total bandwidth into distinct bandwidth parts, assigning the control channel to a first BWP that fits within limited capability terminal devices' receiving bandwidth, while the data channel uses a second BWP that can be larger. This segmentation maintains resource allocation flexibility while ensuring PDCCH monitoring accessibility for all terminal types.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces a cross-BWP scheduling mechanism as an intermediary, where the PDCCH in the first BWP acts as a mediator to schedule resources in the second BWP. This allows limited capability terminal devices to monitor control channels in their supported bandwidth while still accessing data resources in the broader second BWP through the scheduling indication.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Ease of operation

If PDSCH is transmitted only within the same bandwidth as PDCCH, then reception simplicity is improved, but bandwidth utilization efficiency deteriorates for limited capability terminal devices

Engineering Contradiction:

Improvereception simplicityVSAvoidbandwidth utilization efficiency

Core Design Contradiction:

Ease of operationVSProductivity

Solution Approach 1:

The patent segments bandwidth resources into control and data portions, allowing the PDSCH to extend into a second BWP beyond the first BWP where PDCCH is transmitted. This segmentation enables limited capability terminal devices to maintain simple reception procedures within their supported bandwidth while the system achieves improved bandwidth utilization through cross-BWP scheduling.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent adds a dimensional aspect to resource allocation by introducing cross-bandwidth-part scheduling. Instead of confining PDSCH to the same one-dimensional bandwidth as PDCCH, the system allows PDSCH to extend into another bandwidth dimension (the second BWP), accessible through the scheduling indication in the first BWP, thereby improving bandwidth utilization while maintaining reception simplicity.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Data Source

PatentUS20250071748A1Data transmission method and communication equipment

Publication Date: 2025.02.27 BEIJING XIAOMI MOBILE SOFTWARE CO LTD

AI summary

Embodiments of the present disclosure provide a data transmission method and a communication equipment. The data transmission method comprises: a terminal device monitors a first PDCCH in a first bandwidth part (BWP), and receives a PDSCH in a second BWP on the basis of the first PDCCH, the bandwidth of the first PDCCH being within a reception bandwidth of the terminal device, and the first PDCCH being used for scheduling the PDSCH.