CORESET Symbol Extension for PDCCH and PDSCH Mapping
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Solution Overview
Problem
In machine-to-machine (M2M) scenarios, reducing terminal bandwidth and receive antennas leads to deteriorated performance of the physical downlink control channel (PDCCH) due to loss of receive diversity gain and inability to support higher aggregation levels, affecting flexibility and transmission performance.
Innovation Solution
Increasing the number of consecutive time-domain symbols in the control-resource set (CORESET) to enhance PDCCH performance and ensure flexibility in time-domain resource allocation of the physical downlink shared channel (PDSCH) by determining appropriate PDSCH time-domain resource configurations based on the number of CORESET symbols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of consecutive time-domain symbols in CORESET is increased to enhance PDCCH performance, then PDCCH transmission performance is improved, but PDSCH mapping type A resource configuration cannot be supported when symbols exceed 3
Solution Approach 1:
The patent segments the time-domain resources by introducing a gap between the CORESET and PDSCH when the CORESET occupies more than 3 symbols. This segmentation allows the PDCCH to utilize extended time resources for improved performance while the PDSCH starts after the gap, avoiding resource collision and maintaining mapping type A support.
Solution Approach 2:
The patent resolves the contradiction by transitioning from a one-dimensional resource allocation (continuous time symbols) to a two-dimensional approach that considers both the CORESET symbol range and the PDSCH start position. By introducing the gap parameter as an additional degree of freedom, the system can simultaneously achieve extended PDCCH performance and PDSCH mapping type A support.
2Ease of manufacture
If terminal bandwidth is reduced to lower terminal costs, then terminal device cost is reduced, but PDCCH cannot support higher aggregation levels and performance deteriorates
Solution Approach 1:
The patent compensates for the reduced bandwidth by extending the time dimension. Instead of relying on frequency-domain aggregation levels that require wider bandwidth, the system uses longer time-domain durations (more consecutive symbols) to provide sufficient resources for PDCCH transmission, maintaining performance while supporting cost-reduced terminals.
Solution Approach 2:
The patent changes the key parameter from frequency-domain aggregation level to time-domain duration. By increasing the number of consecutive time-domain symbols in the CORESET, the system achieves the necessary PDCCH performance without requiring the terminal to support wide bandwidth, thus enabling cost-reduced terminal devices to maintain adequate PDCCH performance.
3Ease of manufacture
If the number of receive antennas is reduced to lower terminal costs, then terminal device cost is reduced, but receive diversity gain is lost and PDCCH performance deteriorates
Solution Approach 1:
The patent compensates for the loss of spatial diversity (fewer antennas) by extending the time dimension. By providing more consecutive time-domain symbols for PDCCH transmission, the system increases the available resources in the time domain to offset the reduced receive diversity gain, maintaining PDCCH performance in cost-reduced terminals with fewer antennas.
Data Source
AI summary
In an embodiment a method for enhancing a physical downlink control channel, the method includes obtaining, by a terminal device, control-resource set (CORESET) configuration information, wherein the CORESET configuration information is used for configuring a time-domain resource and a frequency-domain resource of a CORESET, wherein the time-domain resource comprises X time-domain symbols, wherein the X time-domain symbols are consecutive in time domain, wherein X is an integer greater than or equal to 1 and less than or equal to M, and wherein M is an integer greater than or equal to 4 and determining, by the terminal device, a physical downlink shared channel (PDSCH) time-domain resource configuration set based on the X time-domain symbols, wherein the PDSCH time-domain resource configuration set is for PDSCH time-domain resource allocation.