Wireless Device System Information Request Collision Management
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Solution Overview
Problem
In wireless communication systems, particularly in 5G NR, the broadcast of system information (SI) by base stations can lead to increased wireless link congestion due to multiple wireless devices requesting on-demand SI, overwhelming the base station with responses.
Innovation Solution
A wireless device receives a SI change indication, determines scheduling information, and calculates a factor to reduce the probability of request collisions with other devices, using random backoff times or access barring classes to manage the timing of its SI requests, thereby minimizing congestion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If base stations broadcast system information on-demand in response to device requests, then system information can be efficiently provided to individual devices, but wireless link congestion increases due to multiple devices overwhelming the base station with simultaneous requests
Solution Approach 1:
The base station broadcasts preliminary scheduling information indicating future time slots when specific system information will be available. Devices can then plan their requests accordingly, performing preliminary actions to avoid simultaneous requests. This resolves the contradiction by maintaining on-demand efficiency while preventing congestion through advance scheduling.
Solution Approach 2:
The system implements periodic broadcasting of system information at scheduled time slots, rather than responding to every immediate request. This periodic structure allows the base station to manage traffic flow systematically, providing information efficiently while avoiding overwhelming the wireless link with simultaneous responses to multiple devices.
2Loss of time
If multiple wireless devices send simultaneous requests for on-demand system information, then each device can acquire required information quickly, but request collisions occur reducing overall system performance
Solution Approach 1:
Devices perform preliminary actions by checking the broadcast scheduling information before sending requests. This allows them to identify optimal time slots with fewer collisions, reducing both acquisition time and collision probability. The preliminary check ensures devices act intelligently rather than randomly.
Solution Approach 2:
The system changes the temporal parameter of request transmission by introducing scheduled time slots. Instead of uniform random timing, requests are distributed across different time parameters, reducing collisions while maintaining reasonable acquisition times. This parameter change resolves the trade-off between speed and reliability.
Data Source
AI summary
This disclosure provides systems, methods and apparatus, and computer programs encoded on computer storage media, for managing communications with a base station by a processor of a wireless device. In one aspect, a processor of a wireless device may receive from the base station a system information change indication in first system information. The processor may determine from the first system information scheduling information of second system information. The processor may determine a factor that a request for the second system information will collide with a request from another wireless device for the second system information. The processor may send the request for the second system information using the determined factor.