PDCCH PDSCH Resource Overlap Handling for URLLC
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Solution Overview
Problem
In wireless communication, downlink transmission performance deteriorates due to resource conflicts between physical downlink control channels (PDCCH) and physical downlink shared channels (PDSCH) during urgent services like ultra-reliable low-latency communication (URLLC), leading to interference and incorrect data reception.
Innovation Solution
A method where a terminal device and network device determine a resource for data transmission by considering both PDCCH and PDSCH, removing overlapping resources to avoid conflicts and ensure reliable transmission of urgent services by using the second PDCCH to schedule a second PDSCH, thereby prioritizing urgent data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the network device schedules a PDSCH for urgent service by transmitting a second PDCCH, then the low-latency communication performance is improved, but resource conflict with the first PDSCH occurs causing interference
Solution Approach 1:
The patent extracts the harmful overlapping resource elements from the first PDSCH by identifying resource elements that coincide with the second PDCCH and second PDSCH. The terminal device then excludes these extracted harmful resources from the first PDSCH reception, allowing the urgent service to proceed without interference while maintaining the original PDSCH scheduling.
Solution Approach 2:
The patent applies preliminary action by having the terminal device determine the overlapping resources between the first PDSCH and the second PDSCH before actually receiving the data. The device calculates the resource conflict in advance based on the scheduling information from both PDCCHs, and uses this pre-determined knowledge to properly configure the reception process, avoiding interference before it occurs.
2Adaptability or versatility
If the terminal device receives both PDCCH and PDSCH independently, then the scheduling flexibility is improved, but data reception performance deteriorates due to resource overlap
Solution Approach 1:
The patent implements feedback by having the terminal device determine the overlapping resources between the first PDSCH and second PDSCH, then use this information to adjust the reception process. The device feeds back the identified conflict information to properly configure which resource elements to receive from the first PDSCH, ensuring reliable data reception while maintaining scheduling flexibility.
Solution Approach 2:
The patent applies local quality by treating different resource elements differently within the same PDSCH. Instead of receiving all resource elements uniformly, the terminal device selectively receives only the non-overlapping resource elements from the first PDSCH while excluding the overlapping ones that conflict with the urgent service transmission.
3Productivity
If the network device transmits data on overlapping resources, then the spectrum utilization is improved, but interference between different data transmissions occurs
Solution Approach 1:
The patent converts the harmful interference caused by resource overlap into a beneficial feature by using the overlapping resource elements to carry the urgent service data (second PDSCH) while excluding them from the first PDSCH reception. This transforms what would be destructive interference into a mechanism for prioritizing urgent communications, effectively using the conflict to ensure low-latency service delivery.
Data Source
AI summary
This application provides a data sending and receiving method. The method includes: receiving, by a terminal device, a first PDCCH and a second PDCCH, where the first PDCCH is used to schedule a first PDSCH, and the first PDSCH is used to transmit first data; determining, based on the first PDCCH and the second PDCCH, a first resource used to transmit the first data, where the first resource is a part or all of a resource of the first PDSCH; and receiving, by the terminal device, the first data from a network device on the first resource. The first resource is determined with reference to the first PDCCH and the second PDCCH, to avoid a problem that receiving performance of the first PDSCH and the second PDCCH may deteriorate when a resource of the second PDCCH overlaps the resource of the first PDSCH.