Terminal and Base Station COT Timing for Configured Grant PUSCH
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Solution Overview
Problem
Existing wireless communication systems lack flexibility and efficiency, particularly in handling diverse communication scenarios such as enhanced Mobile BroadBand (eMBB), massive Machine Type Communication (mMTC), and Ultra Reliable and Low Latency Communication (URLLC) in a single technology framework.
Innovation Solution
The implementation of Orthogonal Frequency Division Multiplex (OFDM) with Cyclic Prefix (CP-OFDM) in downlink and Discrete Fourier Transform-spread-OFDM (DFT-s-OFDM) in uplink, along with resource grid configurations and carrier aggregation, enhances communication flexibility and efficiency by optimizing signal transmission and reception processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single communication structure is used for all scenarios, then system complexity is reduced, but communication flexibility and efficiency deteriorate
Solution Approach 1:
The patent implements dynamic communication structures by introducing multiple numerologies (subcarrier spacings) that can be selectively activated based on service requirements. The system dynamically switches between different subcarrier spacings (e.g., 15kHz for eMBB, 480kHz for URLLC) and flexible slot structures to adapt to varying latency and bandwidth needs, thereby achieving high flexibility without permanent system complexity
Solution Approach 2:
The patent creates a universal communication framework that handles multiple scenarios (eMBB, mMTC, URLLC) through a single unified structure. This is achieved by defining a common resource grid, physical channel framework, and signaling mechanism that can accommodate different numerologies and service types, eliminating the need for separate communication structures for each scenario
2Ease of manufacture
If traditional communication structures are used, then implementation simplicity is maintained, but communication efficiency deteriorates
Solution Approach 1:
The patent achieves high communication efficiency by dynamically adjusting key parameters including subcarrier spacing (15kHz, 30kHz, 60kHz, 120kHz, 240kHz, 480kHz), cyclic prefix lengths, and slot structures based on service requirements. These parameter changes enable optimized spectral efficiency and latency performance without fundamentally altering the underlying OFDM framework, maintaining implementation simplicity through parameter tuning rather than structural redesign
3Loss of time
If larger subcarrier spacing is used, then latency is reduced for URLLC, but spectral efficiency for eMBB deteriorates
Solution Approach 1:
The patent implements dynamic numerology selection where the system can switch between different subcarrier spacings based on the active service type. For URLLC scenarios, larger subcarrier spacings (240kHz, 480kHz) are activated to reduce latency, while for eMBB scenarios, smaller subcarrier spacings (15kHz, 30kHz) are used to maximize spectral efficiency. This dynamic adaptation resolves the trade-off by allowing each service type to operate with its optimal parameters
Solution Approach 2:
The patent segments the frequency spectrum into different numerology-specific resource pools, allowing simultaneous operation of multiple subcarrier spacings in different frequency ranges. This enables parallel transmission of URLLC traffic with 480kHz subcarrier spacing and eMBB traffic with 15kHz subcarrier spacing, thereby achieving both low latency and high spectral efficiency concurrently through frequency-domain segmentation
Data Source
AI summary
Terminal device attempts to initiate a COT-u after the channel is sensed to be idle and transmit a configured grant PUSCH. A start of a time domain resource of the configured grant PUSCH is aligned with the start of the FFP-u. In a case that the FFP-u does not overlap with an IP-g of an FFP-g, the COT-u is initiated and the configured grant PUSCH is transmitted.