Capability-Based Terminal Cell Access for RedCap Emergency Services
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Solution Overview
Problem
Existing wireless communication systems, particularly 4G and early 5G technologies, face challenges in efficiently managing terminal capabilities, especially for RedCap UEs, which are barred from accessing cells due to reduced receiver branches, limiting their ability to make emergency calls or receive critical alerts.
Innovation Solution
A method and apparatus that allows RedCap UEs to access cells for emergency calls by considering cells as acceptable based on specific barring information in MIB and SIB1, enabling emergency service support and facilitating terminal capability information transfer associated with self-organizing network parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If RedCap UEs are barred from accessing cells due to reduced receiver branches, then network resource management is simplified, but emergency service capability is lost
Solution Approach 1:
The patent applies local quality by differentiating cell access rights based on terminal capability. The network determines whether a terminal is capable of receiving system information and uses this to locally adjust access permissions. For RedCap UEs, the network can allow access to specific cells marked as acceptable while maintaining barring for others, thus providing differentiated service quality without increasing overall network complexity.
Solution Approach 2:
The patent implements dynamics by making cell access permissions dynamic rather than static. The network can change the acceptable cell list and barring information based on terminal capability, signal conditions, and network load. This dynamic adjustment allows the system to adapt access policies in real-time, enabling emergency service capability for RedCap UEs when needed while maintaining simplified resource management under normal conditions.
2Productivity
If cells are barred for RedCap UEs, then network capacity is protected, but terminal capability utilization is reduced
Solution Approach 1:
The patent applies parameter changes by modifying cell selection criteria based on terminal capability parameters. The network changes the set of acceptable cells and barring information dynamically according to the terminal's receiver branch configuration. This allows the system to optimize network capacity utilization while adapting to different terminal capabilities, preventing unnecessary barring of RedCap UEs from cells where they can effectively operate.
Solution Approach 2:
The patent implements preliminary action by having the network pre-determine and communicate acceptable cell information before the terminal needs to access the network. The network prepares and transmits barring information and acceptable cell lists in advance, allowing terminals to make informed access decisions without causing network congestion or capacity issues, thus balancing network capacity protection with terminal capability utilization.
3Productivity
If barring information is transmitted in MIB and SIB1, then system information efficiency is improved, but processing complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the system information into different blocks with specific functions. The MIB contains essential barring information for initial access, while SIB1 provides additional acceptable cell details. This segmentation allows efficient transmission of critical information without overloading any single block, and enables terminals to process information in stages, reducing overall processing complexity while maintaining system information efficiency.
Data Source
AI summary
Provided are a method and apparatus for operating a terminal based on capability in a wireless communication system. A terminal may receive a master information block (MIB) including first barring information. After receiving the MIB, the terminal may receive a system information block 1 (SIB1) including second barring information and third barring information. Further, the terminal may consider a first cell as an acceptable cell, based on the first barring information, the second barring information and the third barring information.