MPDCCH Delay Signaling for Accurate PDSCH Subframe Scheduling
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Solution Overview
Problem
In the MTC system of Release 17, half-duplex terminals face challenges in determining the PDSCH scheduling delay due to the lack of an indication mode, leading to issues with subframe alignment and affecting downlink peak rate, especially in scenarios with invalid subframes.
Innovation Solution
A method and apparatus for determining PDSCH scheduling delay by detecting MPDCCH on a first subframe, where DCI includes a signaling field indicating the delay, and determining the second subframe of PDSCH transmission based on this value, considering various units and conditions such as valid downlink subframes, HARQ process indices, and feedback delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If no indication mode is provided for PDSCH scheduling delay, then the system structure remains simple, but the terminal cannot accurately determine PDSCH transmission timing, affecting downlink peak rate
Solution Approach 1:
The patent changes the parameter representation by introducing a signaling field in DCI that explicitly indicates the PDSCH scheduling delay value. This transforms the implicit timing relationship into an explicit parameter that can be directly controlled and optimized for different scenarios, thereby improving downlink peak rate without excessive complexity
Solution Approach 2:
The patent segments the timing relationship by separating the PDSCH scheduling delay indication from other DCI fields. This allows independent optimization of the scheduling delay parameter while keeping the overall DCI structure manageable, resolving the contradiction between achieving high productivity and maintaining acceptable device complexity
2Manufacturing precision
If PDSCH scheduling delay is not indicated, then the control channel structure remains simple, but subframe alignment cannot be achieved, affecting transmission accuracy
Solution Approach 1:
The patent introduces a specific parameter (PDSCH scheduling delay value) in the DCI signaling field that directly controls the timing offset between MPDCCH and PDSCH. This explicit parameter enables precise subframe alignment while keeping the signaling overhead manageable through efficient encoding
Solution Approach 2:
The patent replaces the implicit mechanical timing relationship with an explicit signaling mechanism. Instead of relying on fixed timing structures, the system uses a configurable signaling field to indicate the scheduling delay, achieving higher precision in subframe alignment while maintaining flexibility
3Adaptability or versatility
If fixed PDSCH scheduling delay is used, then the system complexity is low, but the system cannot adapt to different scenarios requiring flexible timing
Solution Approach 1:
The patent transforms the static fixed scheduling delay into a dynamic configurable parameter. The signaling field in DCI allows the PDSCH scheduling delay to be adjusted according to different scenarios, terminal capabilities, and network conditions, achieving high adaptability while maintaining reasonable system complexity through standardized signaling procedures
Data Source
AI summary
Provided are an information determination method and apparatus, a device, and a storage medium. The information determination method is applied to a first node and includes the following: detecting a machine-type communication physical downlink control channel (MPDCCH) on a first subframe, where the MPDCCH carries downlink control information (DCI), and the DCI includes a signaling field indicating a value of a physical downlink shared channel (PDSCH) scheduling delay; and determining a second subframe of PDSCH transmission based on the value of the PDSCH scheduling delay.