Paging DCI Indicator Bit for NR-U Terminal Power Reduction
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Solution Overview
Problem
In 5G NR-U systems, terminals continue to monitor extended paging occasions (POs) even after receiving a paging schedule, leading to increased power consumption due to uncertainty about the reason for missing a paging message, such as base station LBT failures or successful transmissions without paging needs.
Innovation Solution
A method where the access network device performs Listen Before Talk (LBT) at a first PO and transmits Paging DCI with an indicator bit to instruct the terminal to stop monitoring subsequent POs if LBT is successful, indicating no need for further paging scheduling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal continuously monitors the extended PO after the original PO, then the terminal can receive the paging message even when the base station has LBT failure, but the power consumption of the terminal increases
Solution Approach 1:
The base station feeds back the LBT result information to the terminal through the indicator bit in the Paging DCI. When the indicator bit is set to a first value, it indicates LBT failure, prompting the terminal to continue monitoring extended POs. When the indicator bit is set to a second value, it indicates LBT success, allowing the terminal to stop monitoring. This feedback mechanism enables the terminal to adjust its monitoring behavior based on actual base station conditions, resolving the contradiction between reliability and power consumption.
Solution Approach 2:
The terminal's paging monitoring behavior is made dynamic rather than static. Instead of continuously monitoring all extended POs regardless of conditions, the terminal adjusts its monitoring strategy based on the indicator bit received from the base station. This dynamic adjustment allows the system to optimize between reliability (when needed) and power consumption (when LBT succeeded), directly addressing the technical contradiction.
2Reliability
If the base station extends the PO exponentially based on the number of SSBs, then the terminal can receive the paging message when the base station has LBT failure, but the terminal cannot distinguish between LBT failure and successful transmission without paging needs
Solution Approach 1:
The indicator bit in the Paging DCI serves as an intermediary that carries LBT result information from the base station to the terminal. This intermediary element enables the terminal to understand the reason for paging message reception or non-reception, allowing it to distinguish between LBT failure (continue monitoring) and LBT success with no paging need (stop monitoring), thus resolving the information loss problem.
Solution Approach 2:
The base station provides feedback about its LBT status through the indicator bit, enabling the terminal to understand why it received or did not receive the paging message. This feedback mechanism eliminates the terminal's uncertainty about transmission status, allowing it to make informed decisions about whether to continue monitoring extended POs, thereby resolving the information loss contradiction.
Data Source
AI summary
A method for monitoring a PO is provided. The method is applicable to a terminal in a NR-U system. A paging cycle of the terminal includes an original PO and at least one extended PO of the original PO. The original PO and the extended PO form a PO window. The method includes: receiving, at a first PO, paging downlink control information (Paging DCI), carried in a paging physical downlink control channel (PDCCH) scrambled by a paging radio network temporary identity (P-RNTI), from an access network device, in which the first PO is one of the original PO and the extended PO; and determining to stop monitoring, other PO located after the first PO, in the paging cycle, based on an indicator bit of the Paging DCI.