Uplink Access Control in RRC Inactive Wireless Systems
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Solution Overview
Problem
Current wireless communication systems, particularly 5G NR, face challenges in optimizing access control for user equipment (UE) during Radio Resource Control (RRC) Inactive state, especially in managing uplink data transmission and cell barring mechanisms, which affect data volume thresholds and access categories, leading to inefficiencies in packet transmission.
Innovation Solution
A method and UE implementation that receive radio resource configurations to transmit uplink packets based on specific conditions, including data volume thresholds and unified access control mechanisms, to manage access attempts and barring times, ensuring efficient data transmission while avoiding barred cells and optimizing resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE transmits uplink packets during RRC Inactive state without access control, then the data transmission efficiency is improved, but the network resource management deteriorates due to uncontrolled access attempts
Solution Approach 1:
The patent applies parameter changes by introducing a data volume threshold parameter that dynamically controls access behavior. When pending uplink data is below the threshold, the UE can transmit packets during RRC Inactive state; when exceeding the threshold, the UE must transition to RRC Connected state. This parameter-based control optimizes transmission efficiency for small data while managing network resources for large data volumes.
Solution Approach 2:
The patent implements dynamic access control where the UE's transmission capability changes based on real-time conditions. The system dynamically adjusts whether the UE can transmit in RRC Inactive state by evaluating the data volume threshold condition, creating a flexible access control mechanism that adapts to varying data transmission needs.
2Reliability
If the UE checks cell barring status and data volume threshold before transmission, then the network resource management is improved, but the access control complexity increases
Solution Approach 1:
The patent applies preliminary action by having the UE check cell barring status and evaluate data volume thresholds before initiating uplink transmission. The UE performs these checks in advance during RRC Inactive state, determining whether to transmit packets or transition to RRC Connected state before actual data transmission begins, ensuring reliable network resource management.
Solution Approach 2:
The patent implements self-service through autonomous UE decision-making. The UE independently checks cell barring status, evaluates its pending data volume against the threshold, and autonomously determines whether to transmit packets or initiate RRC connection resumption, reducing the need for network-controlled access procedures.
3Reliability
If the UE transitions to RRC Connected state for large data volumes, then the data transmission reliability is improved, but the access latency increases
Solution Approach 1:
The patent applies segmentation by dividing data transmission scenarios into two segments: small data volumes (below threshold) handled in RRC Inactive state for low latency, and large data volumes (above threshold) handled in RRC Connected state for high reliability. This segmentation allows the system to optimize for different requirements based on data size.
Solution Approach 2:
The patent implements dynamic state transition where the UE adjusts its RRC state based on data volume requirements. For urgent small data transmissions, the UE remains in RRC Inactive state; for large data transmissions requiring reliable connection, the UE dynamically transitions to RRC Connected state, optimizing the balance between latency and reliability.
Data Source
AI summary
A method and a UE for access control in a wireless communication system are provided. The method performed by a UE for access control includes while attempting to initiate an UL data transmission procedure with a serving cell during an RRC Inactive state of the UE, receiving a radio resource configuration from the serving cell and transmitting one or more UL packets to the serving cell based on the radio resource configuration when a plurality of conditions is fulfilled. The plurality of conditions includes, at least: an attempt to transmit UL data is not barred by the serving cell, and an amount of pending UL data to be transmitted is less than or equal to a data volume threshold.