5G RRC Idle Mode Paging with Adaptive Beam Failure Recovery
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Solution Overview
Problem
Current RRC idle mode operations in 5G wireless communication systems face challenges in power consumption minimization and paging monitoring, particularly in handling beam failure recovery (BFR) scenarios where uplink shared channel (UL-SCH) resources are insufficient to accommodate medium access control (MAC) elements.
Innovation Solution
A method and system are developed to trigger beam failure recovery (BFR) by determining if the UL-SCH resource can accommodate a MAC control element (CE) and, if not, initiating a scheduling request (SR) for the serving cell, with corresponding actions taken by both the terminal and base station to manage resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal triggers beam failure recovery (BFR) by sending MAC CE on UL-SCH, then the beam failure can be recovered, but the power consumption increases and resource availability is insufficient when UL-SCH resources are not available
Solution Approach 1:
The patent implements dynamic selection between two BFR triggering methods based on real-time UL-SCH resource availability. When UL-SCH resources are available, the terminal uses MAC CE on UL-SCH for BFR triggering. When UL-SCH resources are unavailable, the terminal dynamically switches to using a random access preamble on PRACH for BFR triggering. This dynamic adaptation ensures reliable beam failure recovery while optimizing power consumption by selecting the most efficient available resource.
Solution Approach 2:
The patent changes the triggering parameter from MAC CE (which requires UL-SCH resources) to random access preamble (which uses PRACH resources) based on the availability condition of UL-SCH. This parameter change allows the system to adapt to different resource availability scenarios, maintaining BFR functionality while avoiding power waste from attempting to use unavailable resources.
2Reliability
If the terminal monitors paging in RRC idle mode, then it can receive network notifications, but the power consumption increases due to continuous monitoring requirements
Solution Approach 1:
The patent implements discontinuous reception (DRX) for paging monitoring in RRC idle mode. Instead of continuous monitoring, the terminal wakes up at periodic intervals to check for paging messages and then returns to sleep mode. This periodic action maintains paging monitoring reliability by ensuring the terminal checks for messages at regular intervals while dramatically reducing power consumption compared to continuous monitoring.
3Productivity
If the UL-SCH resource is used to accommodate MAC CE for BFR, then the BFR can be triggered efficiently, but the resource availability becomes insufficient when no UL-SCH resources are available
Solution Approach 1:
The patent makes the random access preamble serve multiple functions: it is used for both initial access and beam failure recovery triggering. By configuring dedicated random access preambles for BFR, the system enables the PRACH resource to function as an alternative BFR triggering mechanism when UL-SCH is unavailable, thereby improving resource availability flexibility while maintaining BFR efficiency through dedicated preamble allocation.
Data Source
AI summary
The disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IOT). The disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as a smart home, a smart building, a smart city, a smart car, a connected car, health care, digital education, a smart retail, security and safety services. A method and an apparatus for an RRC idle mode related operations in wireless communication system are provided.