UE Prohibit Timer for RLM Reporting in Wireless Systems
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Solution Overview
Problem
The existing wireless communication systems, particularly in 3GPP LTE, face challenges in efficiently managing enhanced radio link monitoring (RLM) reports, leading to excessive reporting that can hinder network performance and resource management, especially with the introduction of new radio (NR) systems requiring improved intra-cell mobility and spectrum efficiency.
Innovation Solution
The implementation of a prohibit timer mechanism at the UE's RRC layer to control the transmission of early-out-of-sync and early-in-sync indications, preventing excessive reporting by starting and canceling timers based on consecutive indications, thereby optimizing RLM event reporting and reducing unnecessary network configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the UE transmits early-out-of-sync and early-in-sync indications frequently to improve intra-cell mobility, then the responsiveness of reconfiguration is improved, but excessive reporting occurs which hinders network performance and consumes unnecessary resources
Solution Approach 1:
The patent implements a prohibit timer mechanism that periodically restricts the transmission of early-out-of-sync and early-in-sync indications. After the UE transmits these indications, it must wait for the prohibit timer to expire before transmitting again, converting continuous reporting into periodic reporting. This resolves the contradiction by maintaining necessary responsiveness while preventing excessive reporting that degrades network performance.
2Loss of time
If the UE transmits early-out-of-sync and early-in-sync indications continuously to enable timely reconfiguration, then the mobility management is improved, but network resources are wasted due to excessive reporting
Solution Approach 1:
The prohibit timer creates periodic reporting intervals, allowing the UE to transmit synchronization status updates only at designated intervals rather than continuously. This reduces network resource consumption and energy waste while still enabling timely reconfiguration when actually needed, as the timer can be configured to appropriate values.
Solution Approach 2:
The patent changes the transmission parameter of synchronization indications from continuous to periodic by introducing the prohibit timer mechanism. This parameter change optimizes the balance between reconfiguration speed and resource efficiency by controlling the frequency of transmissions based on network requirements.
Data Source
AI summary
A method and apparatus for transmitting a user equipment (UE) assistance information message in a wireless communication system is provided. Upon receiving N consecutive number of indications of early-out-of-synchronization/early-in-synchronization from a lower layer of the UE, the UE transmits the UE assistance information message including the early-out-of-synchronization/early-in-synchronization indication to the network, and starts a prohibit timer for prohibiting transmission of the UE assistance information message including the early-out-of-synchronization/early-in-synchronization indication to the network. Further, the UE cancels a prohibit timer, if running, for prohibiting transmission of a UE assistance information message including an early-in-synchronization/early-out-of-synchronization indication.