Paging Frame Determination for RRC Inactive and Idle States
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing eDRX method for determining terminal device identity is inadequate for RRC Inactive and RRC Idle states, leading to inefficient paging frame and paging occasion determination, which affects power saving and downlink data delay.
Innovation Solution
A method where the terminal device determines its identity based on the configuration status of eDRX and current RRC state, and subsequently determines the paging frame and paging occasion, allowing for more dispersed distribution of PF and PO based on different UE_ID values, ensuring synchronization with the network for both idle and inactive modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the terminal device uses existing eDRX method for identity determination, then the paging cycle can be extended for power saving, but the paging frame and paging occasion determination becomes inadequate for RRC Inactive and RRC Idle states
Solution Approach 1:
The patent changes the identity determination parameters by introducing different identity derivation methods based on RRC state. For RRC Idle state, it uses 5G-S-TMSI mod 4096, while for RRC Inactive state, it uses 5G-S-TMSI mod 1024. This parameter differentiation resolves the inadequacy of existing methods for specific RRC states while maintaining power saving benefits of eDRX
2Reliability
If the terminal device monitors paging channel during PTW in eDRX cycle, then downlink data can be received, but the device must wake up frequently increasing power consumption
Solution Approach 1:
The patent implements periodic monitoring of paging channel during Paging Time Window (PTW) within extended DRX cycles. The terminal device wakes up at specific periodic intervals determined by eDRX cycle length and PTW configuration, monitors paging messages, and then returns to sleep state. This periodic action enables downlink data reception while minimizing power consumption by keeping the device dormant for most of the eDRX cycle
3Device complexity
If the terminal device uses unified identity determination for all RRC states, then the system is simple, but it cannot provide accurate paging for RRC Inactive and RRC Idle states
Solution Approach 1:
The patent applies local quality by assigning different identity determination methods to different RRC states. Instead of a unified approach, it tailors the identity derivation formula to the specific requirements of RRC Idle (using mod 4096) and RRC Inactive (using mod 1024) states, ensuring accurate paging occasion determination for each state while maintaining manageable system complexity
Data Source
AI summary
Embodiments of the present disclosure relate to determination of terminal device's identify. A terminal device determines an identity (ID) of the terminal device based on configuration status of extended Discontinuous Reception (eDRX) and current Radio Resource Control (RRC) state of the terminal device; and determines one or both of paging frame (PF) and paging occasion (PO) based on the determined ID of the terminal device. In this way, paging in the eDRX can work well in RRC idle state or RRC inactive state, and the network and the UE may be synchronized with UE's PF and PO for paging in the eDRX.