DCI Transmission Merging Paging and System Information Updates
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Solution Overview
Problem
In communications systems, particularly in New Radio (NR) systems, the transmission of downlink control information (DCI) incurs relatively large signaling transmission overheads due to the need for separate updates on physical downlink shared channels (PDSCH) and physical downlink control channels (PDCCH) for terminals in different states, such as idle and connected states.
Innovation Solution
A method where DCI transmission carries both PDSCH scheduling information and a short message to indicate changes in system information, allowing simultaneous update and paging of idle-state terminals, reducing delays and overheads by including indication information to specify the content carried in the DCI, thereby enabling both connected-state and idle-state terminals to demodulate the necessary information efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If update notifications of system information are transmitted on different channels (PDSCH for idle state, PDCCH for connected state), then terminal performance in different states is ensured, but signaling transmission overheads increase
Solution Approach 1:
The patent merges the transmission of system information update notifications and paging messages into a single PDCCH transmission. The DCI format is extended to include both a short message (for system information updates) and paging indication, allowing the base station to simultaneously notify both connected-state and idle-state terminals through one channel, thereby reducing signaling overhead while maintaining reliability for both terminal states.
Solution Approach 2:
The PDCCH is given multi-functionality by enabling it to carry both system information update notifications (originally for connected-state terminals) and paging messages (originally for idle-state terminals). The DCI structure is designed to accommodate different message types through indication fields, allowing a single channel to serve multiple purposes and reduce the need for separate transmissions.
2Reliability
If separate transmissions on PDSCH and PDCCH are used for different terminal states, then specific terminal requirements are met, but transmission delays increase
Solution Approach 1:
The patent combines system information update notifications and paging messages into a single PDCCH transmission. By merging these functions, the base station can simultaneously notify both connected-state and idle-state terminals in one transmission opportunity, eliminating the sequential delays that would occur with separate transmissions on different channels.
Solution Approach 2:
The patent uses indication fields within the DCI to pre-specify the content type (system information update, paging message, or both). This preliminary indication allows terminals to efficiently prepare for and process the appropriate information without waiting for additional signaling, reducing processing delays while maintaining state-specific performance requirements.
3Productivity
If DCI carries both PDSCH scheduling information and system information update indication, then transmission efficiency improves, but DCI complexity increases
Solution Approach 1:
The DCI is segmented into distinct functional fields: a short message field for system information updates, a paging indication field, and PDSCH scheduling information. This segmentation allows each component to be independently processed and interpreted by terminals, managing complexity through structured organization while enabling efficient multi-purpose transmission.
Solution Approach 2:
The DCI includes indication fields that preliminarily specify the content type and structure before the actual data is processed. These indication fields allow terminals to pre-configure their processing logic based on the indicated message type, simplifying the overall structure by providing clear, advance guidance on how to interpret the remaining DCI fields.
4Productivity
If indication information is added to DCI to specify content type, then terminal demodulation efficiency improves, but signaling overhead increases
Solution Approach 1:
The patent uses compact indication fields within the DCI that provide just enough information for terminals to efficiently demodulate and process the appropriate content. Rather than transmitting full metadata or extensive signaling, the indication fields use minimal bits to specify content type (system information update, paging message, or both), achieving high demodulation efficiency with minimal additional overhead.
Data Source
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AI summary
Embodiments of this disclosure provide a DCI transmission method, a terminal, and a base station. The method includes: receiving DCI, wherein when there is simultaneously in a network a paging message for an idle-state terminal and a change of system information, the DCI carries PDSCH scheduling information for the paging message and a short message; otherwise, the DCI carries the scheduling information or the short message, where the short message is used to indicate the change of system information; and obtaining at least one of the scheduling information and the short message from the DCI.