Radio Communication Signal Multiplexing for Scalable TTI
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Solution Overview
Problem
Future radio communication systems, such as 5G, face challenges in achieving scalable communication due to the limitations of existing LTE systems, particularly in configuring transmission time intervals (TTIs) and acknowledging information, which can lead to inadequate communication performance when frequency-division-multiplexing TTIs with different radio parameters.
Innovation Solution
A user terminal and radio base station implementation that time-division-multiplexes downlink and uplink control signals within the same frequency domain unit, allowing for flexible configuration of TTIs and improved scalability in both the time and frequency domains through self-contained transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If frequency-division-multiplexing is applied to multiple TTIs with different radio parameters, then service diversity and scalability are improved, but communication reliability deteriorates due to control signal interference and resource allocation complexity
Solution Approach 1:
The frequency band is divided into multiple frequency domain units, with each unit independently configured for specific services. This segmentation allows different TTIs with different radio parameters to be allocated to different frequency domain units, enabling service diversity while maintaining communication reliability within each unit through dedicated control signals.
Solution Approach 2:
The patent transitions from time-domain multiplexing to frequency-domain multiplexing by dividing the frequency band into multiple frequency domain units. This dimensional change allows simultaneous transmission of multiple TTIs with different radio parameters in different frequency units without time conflicts, improving both scalability and reliability.
2Adaptability or versatility
If existing LTE control mechanisms are applied to frequency-division-multiplexed TTIs, then system compatibility is maintained, but communication performance deteriorates due to inadequate feedback timing and resource allocation
Solution Approach 1:
Each frequency domain unit is configured with local control signals and resource allocations tailored to specific service requirements. The downlink control signals, downlink data signals, and uplink control signals are independently managed within each frequency domain unit, allowing optimized resource allocation and feedback timing for different services while maintaining overall system compatibility.
Solution Approach 2:
The patent implements dynamic resource allocation where the radio base station can flexibly assign different radio parameters (TTI duration, CP duration, ACK/NACK timing) to different frequency domain units based on service demands. This dynamic configuration enables both LTE compatibility and enhanced communication performance for diverse services.
Data Source
AI summary
The present invention is designed to communicate using a radio interface with improved scalability in the frequency domain. According to the present invention, a user terminal includes a receiving section that receives a downlink control signal including information about the assignment of a downlink data signal and receives the downlink data signal based on the downlink control signal, and a transmission section that transmits an uplink control signal including transmission acknowledgment information in response to the downlink data signal. Further, a plurality of frequency domain units constituting the entire frequency band as a block are formed. The downlink control signal, the downlink data signal and the uplink control signal are time-division-multiplexed in the same frequency domain unit.