Multi-TTI PUSCH Scheduling in Unlicensed Spectrum
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently operating on unlicensed spectrum, particularly in maintaining fair coexistence with other technologies and minimizing the impact of Listen Before Talk (LBT) procedures on Physical Uplink Shared Channel (PUSCH) transmissions, which affects bandwidth, latency, and data rates.
Innovation Solution
The design of new Downlink Control Information (DCI) formats for scheduling multiple transmission time intervals (TTIs) in the unlicensed spectrum, including Grant-Based PUSCH (GB PUSCH) and Configured Grant-Based PUSCH (CG PUSCH), prioritizes GB PUSCH over CG PUSCH, and optimizes channel access to reduce overhead and improve transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Listen Before Talk (LBT) procedures are implemented in unlicensed spectrum, then fair coexistence with other technologies is improved, but transmission bandwidth and data rates deteriorate due to overhead
Solution Approach 1:
The system performs LBT procedures in advance before PUSCH transmissions to secure channel access. By conducting the listen-before-talk assessment beforehand, the system ensures fair coexistence with other unlicensed spectrum users while minimizing the impact on actual transmission bandwidth and data rates.
2Reliability
If Listen Before Talk (LBT) procedures are implemented, then fair coexistence with other technologies is improved, but transmission latency increases
Solution Approach 1:
LBT procedures are executed in advance of the actual PUSCH transmission to determine channel availability. This preliminary action ensures fair coexistence while allowing the system to prepare transmission resources ahead of time, thereby minimizing the latency impact on actual data transmission.
3Productivity
If multiple transmission time intervals are scheduled, then transmission efficiency is improved, but complexity of scheduling and control increases
Solution Approach 1:
The transmission time intervals are segmented into multiple discrete units that can be independently scheduled and controlled. This segmentation allows the system to manage complex multi-TTI schedules by breaking them down into manageable time intervals, each with its own resource allocation and control parameters.
Data Source
AI summary
Systems, apparatuses, methods, and computer-readable media are provided for a wireless communication on an unlicensed spectrum. An access point (AP) of the wireless communication system includes a processor circuitry, and radio front end circuitry coupled to the processor circuitry. The processor circuitry is configured to schedule multiple transmission time intervals (multi-TTIs) in a physical uplink shared channel (PUSCH) in the unlicensed spectrum. The processor circuitry is configured to generate a downlink control information (DCI) to include the scheduled multi-TTIs and a hybrid automatic repeat and request acknowledgement (HARQACK) assessment information associated with the scheduled multi-TTIs. The radio front end circuitry is configured to transmit the DCI to a user equipment (UE) over the unlicensed spectrum.