PDSCH Scheduling Constraints for NTN Resource Efficiency
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Solution Overview
Problem
In Non-Terrestrial Network (NTN) systems, there is a lack of effective scheduling constraints for Physical Downlink Shared Channels (PDSCHs), leading to potential out-of-order reception of PDSCHs by terminal devices, which can result in resource waste and communication inefficiencies.
Innovation Solution
Implementing a method where terminal devices and network devices adhere to specific scheduling constraints, such as not expecting to receive a second PDSCH for a hybrid automatic repeat request (HARQ) process until HARQ-ACK feedback is sent, using a first PDCCH to schedule the second PDSCH, thereby avoiding unnecessary resource allocation and maintaining order in PDSCH reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If scheduling constraints for PDSCH are not implemented in NTN systems, then the system has simpler scheduling flexibility, but terminal devices may receive PDSCH out of order causing resource waste and communication inefficiency
Solution Approach 1:
The patent applies preliminary action by establishing scheduling constraints before PDSCH transmission occurs. The network device determines a time range based on first PDSCH reception timing and configured parameters, and prohibits scheduling of second PDSCH or transmission of PDCCH during this time range. This preventive approach ensures PDSCH reception order is maintained from the outset, avoiding the need for complex post-reception reordering operations at the terminal device, thus improving communication efficiency while keeping scheduling rules manageable.
2Adaptability or versatility
If multiple PDSCH are scheduled for the same HARQ process without time range constraints, then resource allocation flexibility increases, but terminal device processing order becomes uncertain leading to resource waste
Solution Approach 1:
The patent implements feedback mechanisms where the terminal device sends HARQ-ACK feedback for the first PDSCH, and the network device uses this feedback timing to determine the prohibited time range. The end of the time range is calculated based on the HARQ-ACK feedback timing offset (k1) and processing time (Tproc). This feedback-driven approach ensures that the network device only schedules subsequent PDSCH after receiving confirmation of previous PDSCH acknowledgment, maintaining reliable reception order while allowing flexible resource allocation within the constrained time window.
3Productivity
If the network device schedules second PDSCH immediately after first PDSCH without time range prohibition, then resource utilization improves, but terminal device may not be ready to receive causing scheduling failures
Solution Approach 1:
The patent applies preliminary action by pre-calculating and establishing a prohibited time range before scheduling the second PDSCH. The time range is determined using the first PDSCH reception timing, HARQ-ACK feedback timing offset (k1), and processing time (Tproc). By prohibiting scheduling during this calculated time range, the patent ensures the terminal device has sufficient time to process the first PDSCH and prepare for the second PDSCH, avoiding scheduling failures while maintaining high resource utilization by allowing scheduling as soon as the time range expires.
Data Source
AI summary
Provided are communication methods and apparatuses, devices, a chip, a storage medium, a product and a program. The method includes: a terminal device receives a first physical downlink shared channel (PDSCH) scheduled for a first hybrid automatic repeat request (HARQ) process from a network device; in a first time range, the terminal device is not expected to receive a second PDSCH scheduled for the first HARQ process from the network device, or is not expected to receive a first physical downlink control channel (PDCCH), the first PDCCH being used for the network device to schedule the second PDSCH for the first HARQ process.