5G Access Procedure Selection for RRC Inactive Reliability
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Solution Overview
Problem
Current wireless communication systems face challenges in configuring the two-step grant-free access scheme for New Radio (NR) systems, managing downlink data transmissions without uplink activity, handling fallback procedures, providing System Information, and optimizing data transmission failures due to mobility and measurement reporting in RRC_INACTIVE state, especially when interworking with LTE systems.
Innovation Solution
Configuring wireless communication devices with rules for selecting access procedures based on service types, capabilities, and circumstances, including grant-free and grant-based methods, fallback procedures, and interworking interfaces between NR and LTE networks, to reduce access failures and optimize data transmission by indicating current and target RRC states during data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a two-step grant-free access scheme is used for NR systems, then access speed and power consumption are improved, but access reliability deteriorates due to contention resolution failures and simultaneous access attempts
Solution Approach 1:
The system dynamically selects between two-step grant-free access and four-step contention-based access procedures based on real-time conditions such as network load, UE capabilities, and service requirements. This dynamic adaptation allows the system to maintain high access speed when conditions permit while switching to more reliable procedures when contention resolution failures occur.
Solution Approach 2:
The patent introduces configurable parameters including access procedure selection rules, fallback thresholds, and network conditions that determine when to use grant-free versus grant-based access. By changing these parameters based on system state, the network optimizes the balance between access speed and reliability.
2Use of energy by moving object
If the UE remains in RRC_INACTIVE state to reduce power consumption, then energy efficiency is improved, but data transmission reliability deteriorates due to mobility and measurement reporting limitations
Solution Approach 1:
The network performs preliminary actions by pre-configuring the UE with access procedure rules and maintaining context information in the RRC_INACTIVE state. This allows the UE to quickly transition to connected state or resume data transmission without full re-establishment, maintaining reliability while preserving energy savings.
Solution Approach 2:
The system implements feedback mechanisms where the network monitors UE behavior, network conditions, and transmission success rates. Based on this feedback, the network dynamically adjusts whether to keep the UE in RRC_INACTIVE state or transition to RRC_CONNECTED state, optimizing the balance between power consumption and transmission reliability.
3Device complexity
If System Information is not provided in NR cells to reduce signalling overhead, then network complexity is reduced, but UE access capability deteriorates due to inability to obtain necessary information
Solution Approach 1:
The patent introduces an intermediary mechanism where the network provides a subset of essential System Information in NR cells and uses fallback procedures to obtain additional information from LTE cells when needed. This intermediary approach reduces network complexity by not providing all possible information while maintaining UE access capability through coordinated information retrieval between NR and LTE systems.
Data Source
AI summary
A method is provided for enabling a User Equipment to access services provided by a radio access network by configuring the User Equipment (UE) with configuration information which comprises rules for selecting one or more of a plurality of access procedures to be used by the UE for accessing services provided by the radio access network which may be a New Radio/5G network. Access procedures may include a grant-based procedure; a grant-free procedure and a fallback procedure to be used in cases of failure of an initial access attempt. The rules may be based on the type of service required by the UE such as; transmission and/or reception of data, transmission and/or reception of a voice call, a request for System Information.