Floating UL Time Units for PDCCH Scheduling in NB-IoT
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in transmitting and receiving wireless signals, particularly in NB-IoT-based systems, where existing methods do not effectively utilize time resources to optimize signal transmission and reception.
Innovation Solution
A method and apparatus for a user equipment (UE) in a wireless communication system that repeatedly receives physical downlink control channel (PDCCH) scheduling information including time delay, and transmits physical uplink shared channel (PUSCH) based on this information, using fixed and floating time units with adjustable transmission power and scrambling sequences, to optimize signal transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If repeated PDCCH receptions are used to improve signal reliability, then transmission reliability is improved, but time resource utilization deteriorates due to fixed UL time unit constraints
Solution Approach 1:
The patent introduces floating UL time units that can dynamically adjust their positions and durations based on when PDCCH receptions end, rather than being constrained to fixed time unit boundaries. This dynamic time resource allocation allows the system to adapt to varying PDCCH reception patterns while maintaining reliable repeated transmissions.
Solution Approach 2:
The patent segments time resources into fixed UL time units and floating UL time units, allowing different transmission strategies for different time resource types. Fixed time units provide stability for regular transmissions, while floating time units provide flexibility for repeated PDCCH-based transmissions that need to adapt to reception timing.
2Reliability
If transmission power is increased to improve signal quality, then transmission reliability is improved, but energy consumption deteriorates
Solution Approach 1:
The patent changes the timing parameter of transmissions by introducing floating UL time units with adjustable start times and durations. This allows transmissions to be scheduled at optimal times based on PDCCH reception completion, improving signal quality through better timing alignment without requiring increased transmission power.
3Device complexity
If fixed UL time units are used to simplify scheduling, then system complexity is reduced, but transmission efficiency deteriorates due to rigid time allocation
Solution Approach 1:
The patent segments time resources into fixed UL time units for regular transmissions and floating UL time units for flexible allocations. This segmentation maintains simple fixed-time scheduling for most traffic while enabling efficient adaptive scheduling for repeated PDCCH-based transmissions, balancing complexity and efficiency.
Solution Approach 2:
The patent creates a universal time resource framework where both fixed and floating UL time units can be used depending on transmission requirements. This multi-functional time resource system handles different traffic types and scheduling scenarios uniformly, improving overall transmission efficiency without significantly increasing system complexity.
Data Source
AI summary
The present invention relates to a wireless communication system, and specifically, to a method and a device therefor, the method comprising the steps of: repeatedly receiving a PDCCH including scheduling information, wherein the scheduling information includes time delay information; and repeatedly transmitting a PUSCH indicated by the scheduling information, after a time point indicated by the time delay information from the time point when the repeated receiving of the PDCCH ends, wherein a time resource in a time region includes a fixed DL time unit having a transmission direction fixed to a DL, and a time resource includes a fixed uplink (UL) time unit having a transmission direction fixed to a UL, and a floating time unit having a variable transmission direction, and the time point indicated by the time delay information is calculated on the basis of the fixed UL time unit.