User Terminal Data Channel Multiplexing for Radio Resource Utilization

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Solution Overview

Problem

Future radio communication systems face inefficiencies due to unoccupied resources in the time field for DL control channels, leading to suboptimal use of radio resources.

Innovation Solution

A user terminal employs a data channel multiplexing method where the control channel is mapped to candidate resources in a search space, allowing for time-division-multiplexing with the data channel, enabling efficient use of resources in both DL and UL communications.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a clear distinction is drawn between the time field for DL control channels and the time field for DL data channels within a TTI, then control channel reliability is improved, but radio resource utilization deteriorates due to unoccupied resources

Engineering Contradiction:
Improvecontrol channel reliabilityVSAvoidradio resource utilization
Core Design Contradiction:
ReliabilityVSProductivity

Solution Approach 1:

The patent applies dynamics by making the time field allocation flexible rather than fixed. The control channel can dynamically occupy different time fields within the TTI depending on scheduling needs, while data channels are allocated in remaining time fields. This dynamic allocation allows the system to adapt to varying traffic conditions and control channel requirements, resolving the contradiction between maintaining control reliability and maximizing resource utilization.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The patent transitions from a static time-division approach to a more flexible resource allocation scheme where control and data channels can be multiplexed in both time and frequency dimensions. By allowing control channels to be mapped to candidate resources in a search space across multiple time fields, the system adds dimensional flexibility to resource allocation, enabling better utilization without compromising control channel functionality.

Inventive Principle:
Principle #17Another dimension (Dimensionality change)

2Productivity

If control channels are mapped to candidate resources in a search space with time-division-multiplexing for data channels, then resource utilization is improved, but system complexity increases

Engineering Contradiction:
Improveresource utilizationVSAvoidsystem complexity
Core Design Contradiction:
ProductivityVSDevice complexity

Solution Approach 1:

The patent applies segmentation by dividing the TTI into multiple candidate time field resources within a search space. Control channels are mapped to specific candidate resources through segmentation of the available time-frequency grid, while data channels are allocated in remaining segmented resources. This segmentation approach enables systematic resource management and reduces the complexity of arbitrary resource allocation.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The system employs self-service mechanisms where user terminals autonomously perform blind decoding of control channels across candidate resources in the search space without requiring explicit scheduling assignments for each control channel location. This self-service approach simplifies the overall system complexity by eliminating the need for complex centralized scheduling decisions for control channel placement.

Inventive Principle:
Principle #25Self-service

3Reliability

If blind decoding is performed over the entire system band for control channels, then control channel detection reliability is improved, but terminal processing complexity increases

Engineering Contradiction:
Improvecontrol channel detection reliabilityVSAvoidterminal processing complexity
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies local quality by concentrating control channel candidates in specific localized time-frequency regions (search space) rather than uniformly distributing them across the entire system band. This localization allows terminals to focus their blind decoding efforts on specific candidate resources within the search space, maintaining detection reliability while significantly reducing processing complexity compared to searching the entire band.

Inventive Principle:
Principle #3Local quality

Solution Approach 2:

The system employs partial action by having terminals perform blind decoding only on a subset of candidate resources within the search space rather than across the entire system band. This partial decoding approach provides sufficient control channel detection capability for normal operation while avoiding the excessive processing complexity that would result from exhaustive full-band searching.

Inventive Principle:
Principle #16Partial or excessive action

Data Source

PatentUS12082200B2User terminal and radio communication method
Publication Date: 2024.09.03 NTT DOCOMO INC
  • US12082200B2 patent drawing
  • US12082200B2 patent drawing
  • US12082200B2 patent drawing

AI summary

The present invention is designed to communicate using data channel multiplexing methods that are suitable for the DL and/or the UL in future radio communication systems. According to the present invention, a user terminal has a transmitting/receiving section that transmits and/or receives a control channel, which is mapped to a candidate resource in a search space, and a data channel, which is at least time-division-multiplexed with the control channel, and a control section that controls transmission and/or receipt of the data channel based on at least one candidate resource in the search space.