Terminal DCI Format 2_4 SPS PDSCH Deactivation
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Solution Overview
Problem
Current 5G mobile communication systems face challenges in efficiently managing downlink control information transmission, particularly in deactivating semi-persistent scheduling (SPS) physical downlink shared channels (PDSCH) to optimize resource allocation and reduce unnecessary data decoding.
Innovation Solution
A method and device that involve receiving SPS configuration and control channel information from a base station, identifying deactivation of activated SPS PDSCH based on downlink control information (DCI), and selectively decoding data only when the SPS PDSCH is active, thereby optimizing resource usage by avoiding data decoding in deactivated channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal continuously monitors and decodes data in SPS PDSCH channels, then data reception reliability is improved, but power consumption increases and resource allocation efficiency deteriorates when channels are deactivated
Solution Approach 1:
The terminal dynamically adjusts its monitoring and decoding behavior based on the activation state of SPS PDSCH channels. When a channel is deactivated (indicated by DCI format 2_4), the terminal stops monitoring and decoding that channel, transitioning from a continuous operation state to an idle state. This dynamic adaptation resolves the contradiction by maintaining reliability only when necessary while reducing power consumption when channels are inactive.
Solution Approach 2:
The system uses DCI format 2_4 as feedback information to inform the terminal about the activation or deactivation state of SPS PDSCH channels. The terminal receives this feedback from the base station and adjusts its behavior accordingly - continuing to monitor when active and stopping when deactivated. This feedback mechanism enables the terminal to align its power consumption with actual data reception needs.
2Reliability
If the terminal decodes all SPS PDSCH channels, then data reception completeness is improved, but processing efficiency deteriorates due to unnecessary decoding of deactivated channels
Solution Approach 1:
The terminal dynamically determines which SPS PDSCH channels require decoding based on DCI format 2_4 information. Instead of statically decoding all configured channels, the terminal adaptively selects only those channels that are currently activated. This dynamic selection process maintains data reception completeness for active channels while eliminating wasteful processing of deactivated channels, thus resolving the contradiction between completeness and efficiency.
Solution Approach 2:
The terminal extracts and processes only the relevant subset of SPS PDSCH channels that are currently activated, separating them from the deactivated channels. By using DCI format 2_4 to identify which channels are active, the terminal extracts only the necessary data reception tasks and excludes unnecessary decoding operations, thereby improving processing efficiency without sacrificing completeness of active channel reception.
3Measurement precision
If the system transmits DCI for each SPS PDSCH activation/deactivation, then control precision is improved, but control channel overhead increases
Solution Approach 1:
DCI format 2_4 serves multiple functions simultaneously: it provides activation/deactivation control for SPS PDSCH channels, carries resource allocation information, and enables precise channel state management. By designing this single DCI format to handle multiple control tasks, the system achieves high control precision without proportionally increasing overhead, as the same control message structure is reused across different functions.
Solution Approach 2:
The system changes the parameter representation in DCI format 2_4 to efficiently encode activation/deactivation states. Instead of transmitting separate DCI messages for each channel state change, the system uses parameter fields within DCI format 2_4 to indicate which SPS PDSCH channels should be activated or deactivated. This parameter-based control approach maintains precision in channel management while reducing the quantity of control information transmitted compared to individual DCI messages for each channel.
Data Source
AI summary
A 5G or 6G communication system for supporting higher data transmission rates. A method performed by a terminal in a communication system may include one or more of the steps: receiving semi persistent scheduling (SPS) configuration information and control channel configuration information from a base station; receiving downlink control information (DCI), repeatedly transmitted through a plurality of physical downlink control channels (PDCCHs), from the base station on the basis of the control channel configuration information; and confirming, on the basis of information included in each of pieces of repeatedly transmitted DCI, whether an activated SPS PDSCH is deactivated. When the activated SPS PDSCH is deactivated, data decoding is not attempted in the deactivated SPS PDSCH.