Cross-Carrier PDSCH Scheduling Using Unified DCI Allocation
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Solution Overview
Problem
The increasing number of terminals in a network leads to insufficient scheduling capacity in wireless communication systems, particularly for physical downlink shared channels (PDSCHs), necessitating a method to efficiently allocate radio resources across multiple cells.
Innovation Solution
A method for scheduling PDSCHs across multiple cells using downlink control information (DCI) transmitted via a physical downlink control channel (PDCCH) of one cell, involving a radio resource control (RRC) message to identify scheduling cells and formats, and DCI that includes frequency domain resource assignment information for PDSCHs, with options for predesignated values when certain cells are not scheduling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of terminals in the network increases, then the network capacity and data traffic demand increase, but the scheduling capacity becomes insufficient
Solution Approach 1:
The patent combines multiple PDSCH scheduling functions into a single DCI message transmitted via PDCCH. Instead of requiring separate scheduling messages for each PDSCH, the invention merges resource assignment information for multiple physical downlink shared channels into one unified control message, thereby improving scheduling capacity to handle increased terminal numbers without proportionally increasing control channel overhead.
Solution Approach 2:
The DCI message is designed to serve multiple scheduling functions simultaneously. A single DCI can schedule multiple PDSCHs across different cells or carriers, making the control mechanism universal and multi-functional. This allows the system to efficiently manage resources for numerous terminals without requiring dedicated scheduling messages for each terminal or each PDSCH, thus resolving the scheduling capacity bottleneck.
2Productivity
If multiple cells are used for data transmission, then the radio resource utilization and data rate improve, but the scheduling complexity increases
Solution Approach 1:
The patent merges scheduling information for multiple cells into a single DCI message. The DCI includes resource assignment fields that can indicate resource allocations across multiple component carriers or cells simultaneously. This consolidation reduces the number of separate scheduling decisions that need to be made and transmitted, thereby reducing scheduling complexity while maintaining high radio resource utilization through multi-cell transmission.
Solution Approach 2:
The invention introduces a new dimension to resource assignment by using carrier indicator fields and cross-carrier scheduling mechanisms. Instead of scheduling each cell independently in one dimension, the system adds a carrier indication dimension to the DCI structure, allowing a single scheduling message to span multiple cells. This dimensional expansion enables efficient multi-cell scheduling without proportionally increasing control overhead or complexity.
Data Source
AI summary
A method of a terminal in a wireless communication system includes receiving a radio resource control (RRC) message, identifying, from the RRC message, information on a scheduling cell and a format for downlink control information (DCI) to be received, receiving, from the scheduling cell, the DCI in the identified format, and receiving data via multiple cells based on the received DCI, where the DCI comprises frequency domain resource assignment information for physical downlink shared channels (PDSCHs).