PDSCH Buffering Limit for 5G UE Power Reduction
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Solution Overview
Problem
In 5G NR systems, when the sub-carrier spacing (SCS) of the PDCCH is smaller than the SCS of the PDSCH, the user equipment (UE) experiences an increased data buffer load due to the need to buffer data from the entire bandwidth part (BWP) until the PDCCH is completely demodulated, leading to extended buffering duration and increased power consumption.
Innovation Solution
The UE starts buffering or receiving the PDSCH no earlier than a time domain limiting location, ensuring that the time domain location of the PDSCH is not earlier than this limiting location, thereby reducing the data buffer volume and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE buffers data from the entire BWP when receiving PDCCH with smaller SCS, then the PDCCH can be completely demodulated, but the data buffer load and power consumption increase
Solution Approach 1:
The patent segments the BWP buffer into multiple portions corresponding to different time domain locations. Instead of buffering the entire BWP from the beginning, the UE buffers data segment by segment starting from the time domain limiting location, reducing the total buffer load while ensuring complete PDCCH demodulation.
Solution Approach 2:
The patent establishes a time domain limiting location in advance before PDCCH reception begins. This preliminary action defines the exact starting point for buffer operations, allowing the UE to prepare the buffer optimally without over-provisioning, thus reducing power consumption while maintaining demodulation reliability.
2Reliability
If the UE buffers data from the entire BWP when receiving PDCCH with smaller SCS, then the PDCCH can be completely demodulated, but the data buffer volume increases
Solution Approach 1:
The patent divides the buffer into segments starting from the time domain limiting location rather than buffering the entire BWP. This segmentation reduces the total buffer volume required while ensuring that all necessary data for PDCCH demodulation is captured.
Solution Approach 2:
The patent extracts only the necessary portion of the BWP data that is required for PDCCH demodulation, starting from the time domain limiting location. By taking out only what is needed rather than buffering everything, the buffer volume is reduced while maintaining demodulation reliability.
3Reliability
If the UE starts buffering when PDCCH is received, then all PDCCH data is captured, but the buffering duration is extended
Solution Approach 1:
The patent performs preliminary action by establishing the time domain limiting location before PDCCH reception starts. This allows the UE to begin buffering at the precise moment when necessary data becomes available, rather than waiting for the entire PDCCH to be received, thus reducing buffering duration while maintaining data capture completeness.
Solution Approach 2:
The patent enables the UE to skip the waiting period and start buffering immediately at the time domain limiting location. By rushing through the buffer start operation rather than waiting for complete PDCCH reception, the buffering duration is reduced while still capturing all necessary data.
Data Source
AI summary
Embodiments of this disclosure provide a method and a terminal for allocating PDSCH time domain resources, and a computer-readable storage medium, where the method is applied to a terminal and includes: starting buffering or receiving, by the terminal, a PDSCH no earlier than a time domain limiting location of the PDSCH, where when SCS of a PDCCH is smaller than SCS of the PDSCH, a time domain location of the PDSCH is not earlier than the time domain limiting location of the PDSCH.