Uplink Cancellation Indication Processing Time in 5G NR
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Solution Overview
Problem
In 5G New Radio (NR) wireless communication systems, scheduling entities may struggle to manage uplink channel allocations due to differences between calculated and realized processing times for uplink cancellation indications (ULCI), leading to potential collisions and communication losses.
Innovation Solution
A method and system where a scheduling entity allocates resources to scheduled entities, transmits an ULCI, and obtains the processing time needed by the scheduled entities to process the command, based on a reference subcarrier spacing (SCS) that is less than or equal to the downlink SCS, ensuring adequate time for resource cancellation before reusing the resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the scheduling entity calculates processing time based on downlink SCS, then the resource allocation efficiency is improved, but the processing time is insufficient for scheduled entities with larger SCS differences
Solution Approach 1:
The scheduling entity determines the processing time Tproc,2 in advance by selecting the minimum SCS between downlink and uplink channels before transmitting the ULCI. This preliminary determination ensures that the scheduled entity has sufficient time to process the cancellation indication and stop uplink transmissions before the scheduled entity reuses the resources, preventing collisions and ensuring reliable resource reallocation.
2Productivity
If the scheduled entity uses allocated resources immediately, then the communication efficiency is improved, but collisions occur when resources need to be canceled
Solution Approach 1:
The scheduling entity transmits the ULCI to the scheduled entity before reusing the allocated resources for other purposes. The scheduled entity processes this cancellation indication and stops using the uplink channel in the allocated resources before the scheduling entity reassigns them. This preliminary anti-action prevents resource collisions by ensuring the resources are truly free before new allocations are made.
Data Source
AI summary
Aspects relate to a scheduling entity allocating a group of scheduled entities with resources that define an uplink channel, transmitting an uplink cancellation indication (ULCI) to the group of scheduled entities identifying at least some resource blocks and OFDM symbols in the allocated resources that are canceled for use as the uplink channel, obtaining a processing time of a scheduled entity, where the scheduled entity may use the processing time to process a command from the scheduling entity, the processing time is based on a reference subcarrier spacing (SCS) that may be less than or equal to a downlink SCS of a downlink channel carrying the ULCI, and waiting at least the processing time before utilizing the at least some resource blocks and OFDM symbols for a purpose other than the uplink channel. A scheduled entity receives the ULCI and may process the ULCI after expiry of the processing time.