Uplink Cancellation Indicators for Wireless Resource Pre-emption
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Solution Overview
Problem
Future wireless communications networks face challenges in efficiently supporting a wide range of devices with different data traffic profiles and latency requirements, particularly in scenarios where URLLC transmissions need to pre-empt resources allocated for eMBB transmissions.
Innovation Solution
The implementation of Downlink Pre-emption Indicators (DL PIs) and Uplink Cancellation Indicators (UL CIs) to manage resource pre-emption in wireless communications networks, allowing URLLC transmissions to pre-empt eMBB resources while minimizing the impact on eMBB decoding performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If URLLC transmissions pre-empt eMBB resources, then URLLC low latency and high reliability requirements are met, but eMBB decoding performance deteriorates due to ghost pre-emption
Solution Approach 1:
The patent segments the reference region into multiple sub-regions and provides separate indication information for each sub-region. This allows precise identification of which specific sub-regions are actually pre-empted by URLLC transmissions, enabling eMBB devices to selectively discard only the pre-empted sub-regions while maintaining decoding for non-pre-empted sub-regions, thereby resolving the contradiction between URLLC reliability and eMBB decoding performance
Solution Approach 2:
The patent applies local quality by providing differentiated indication information for different sub-regions of the reference region. Each sub-region can have its own pre-emption status indicated, allowing the system to treat each sub-region according to its actual pre-emption state rather than applying a uniform treatment to the entire reference region, thus minimizing impact on eMBB decoding while ensuring URLLC reliability
2Device complexity
If DL PIs indicate pre-emption at reference region level, then URLLC resource allocation is simplified, but eMBB decoding performance worsens due to inability to distinguish actual pre-empted portions
Solution Approach 1:
The patent divides the reference region into multiple sub-regions and provides indication information at the sub-region level rather than at the coarse reference region level. This segmentation allows the system to maintain relatively simple URLLC resource allocation while precisely identifying which sub-regions are pre-empted, enabling eMBB devices to make accurate decoding decisions for each sub-region
Solution Approach 2:
The patent introduces an additional dimension of granularity by segmenting the reference region into sub-regions. This dimensional refinement transforms the indication from a single binary state for the entire reference region into multiple binary states for individual sub-regions, providing the necessary precision for eMBB decoding while maintaining manageable complexity for URLLC allocation
3Reliability
If multiple DL PIs are provided for different reference regions, then pre-emption indication coverage is improved, but determination complexity increases due to overlapping reference regions
Solution Approach 1:
The patent segments overlapping reference regions into non-overlapping sub-regions, allowing multiple DL PIs to be provided for different sub-regions without the complexity of handling overlaps. Each sub-region can be independently indicated, improving pre-emption indication coverage while simplifying the determination process by eliminating overlap resolution requirements
Solution Approach 2:
The patent uses sub-regions that may be finer than strictly necessary, creating a finer-grained segmentation of the reference region. This excessive segmentation ensures that all pre-emption scenarios are accurately captured and eliminates overlap ambiguity, improving indication coverage while keeping determination complexity manageable through the regular sub-region structure
Data Source
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AI summary
A communications device configured to transmit signals to or receive signals from a wireless communications network is provided. The communications device comprises transceiver circuitry configured to transmit signals to and receive signals from the wireless communications network via a wireless access interface of the wireless communications network, and controller circuitry configured in combination with the transceiver circuitry to determine uplink communications resources of the wireless access interface to be used for the transmission of data by the communications device, to receive a plurality of uplink cancellation indicators that each indicate that at least a portion of the uplink communications resources is allocated for the transmission of signals by another communications device and is located within communications resources of one of a plurality of reference regions, each of the reference regions being associated with one of the uplink cancellation indicators, to determine that a portion of a first of the reference regions overlaps in both of frequency and time with a portion of a second of the reference regions, the portion of the uplink communications resources located within the communications resources of the first reference region being a first portion of the uplink communications resources and the portion of the uplink communications resources located within the communications resources of the second reference region being a second portion of the uplink communications resources, and to determine, in accordance with dimensions of the first reference region and dimensions of the second reference region, that at least a third portion of the uplink communications resources is allocated for the transmission of signals by another communications device.