CE-SIB Acquisition on PDSCH for Lower WTRU Battery Use
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Solution Overview
Problem
Existing wireless transmit/receive units (WTRUs) in coverage-limited areas face challenges in efficiently acquiring system information blocks (SIBs) due to excessive repetition and resource consumption, particularly in coverage enhancement (CE) mode, which affects battery life and resource efficiency.
Innovation Solution
A method for WTRUs to receive a CE-system information block (CE-SIB) on a physical downlink shared channel (PDSCH) based on known locations or parameters, without monitoring the PDCCH or EPDCCH, allowing reduced battery consumption and targeted information acquisition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If WTRUs monitor PDCCH/EPDCCH continuously to acquire system information, then information acquisition reliability is improved, but battery power consumption increases
Solution Approach 1:
The patent extracts the system information acquisition function from the control channel monitoring process. By introducing a dedicated physical downlink shared channel (PDSCH) for CE-SIB transmission, the system separates the information delivery mechanism from the control channel monitoring, allowing WTRUs to receive system information without continuously monitoring PDCCH/EPDCCH, thus reducing power consumption while maintaining reliability
Solution Approach 2:
The patent introduces a new intermediary channel - the physical downlink shared channel (PDSCH) - as a mediator for system information transmission. This intermediary channel carries CE-SIB specifically for coverage enhanced WTRUs, acting as a bridge that delivers system information without requiring WTRUs to monitor control channels continuously, thereby resolving the contradiction between reliability and power consumption
2Reliability
If system information is transmitted with excessive repetition for coverage enhancement, then coverage coverage is improved, but resource consumption increases
Solution Approach 1:
The patent segments the system information transmission into different channels with different functions. The PDSCH is dedicated to carrying CE-SIB for coverage enhanced WTRUs, while control channels maintain their original function for scheduling and control signaling. This segmentation allows targeted repetition only where needed (in PDSCH for CE-SIB) rather than excessive repetition across all channels, optimizing resource consumption while maintaining coverage enhancement
Solution Approach 2:
The patent applies local quality by providing coverage enhancement specifically for WTRUs in coverage limited areas through CE-SIB on PDSCH, while normal WTRUs continue to use standard system information acquisition methods. The repetition and resource allocation are concentrated locally where coverage enhancement is needed, rather than applying excessive repetition universally, thus improving coverage efficiency and reducing overall resource consumption
Data Source
AI summary
A method and apparatus are described. A method includes determining whether the apparatus is in a coverage enhancement (CE) mode or a non-CE mode. The method further includes receiving a CE-system information block (CE-SIB) on a physical downlink shared channel (PDSCH) based on at least one of a known location or at least one known parameter for the CE-SIB, on a condition that the WTRU is determined to be in the CE mode.