On-Demand System Information Wait Period for Wireless Network Congestion
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Solution Overview
Problem
In LTE wireless networks, user devices often experience congestion and inefficiencies when requesting on-demand system information due to base stations prioritizing other transmissions, leading to repeated requests on the random access channel, which can cause network overload.
Innovation Solution
Implementing a wait period mechanism where user devices receive an indication of a wait period before retrying system information requests, allowing them to back off and reduce network congestion by retransmitting requests only after the specified time, and considering alternative base stations if the wait period exceeds a threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the base station prioritizes other transmissions over system information messages, then network resource utilization is improved, but the system information delivery delay increases
Solution Approach 1:
The base station performs preliminary actions by scheduling system information messages in advance during planning phases when network load is lower. The SI messages are prepared and queued before peak demand periods, ensuring that when UEs request SI information, the messages are already available for transmission without causing delays.
Solution Approach 2:
The base station dynamically adjusts transmission priorities based on real-time network conditions. During low-load periods, SI messages are transmitted with high priority. During high-load periods, the base station flexibly schedules SI transmissions in available gaps while maintaining other critical transmissions, creating a dynamic balance between resource utilization and SI delivery timeliness.
2Reliability
If user devices re-attempt system information requests frequently, then the probability of receiving system information is improved, but random access channel congestion increases
Solution Approach 1:
The base station provides feedback to UEs through the backoff indicator field in RAR messages, informing them of current network congestion levels. UEs use this feedback to adjust their retransmission timing, implementing exponential backoff algorithms that increase wait times after failed attempts. This feedback mechanism reduces the frequency of retransmissions during congestion while maintaining reliable SI delivery when network conditions improve.
Solution Approach 2:
Instead of continuous or frequent retransmission attempts, UEs implement periodic retransmission schedules with exponentially increasing intervals between attempts. The first retry occurs after a short backoff period, subsequent retries occur after progressively longer periods, allowing the random access channel to clear between attempts and reducing overall congestion while maintaining eventual delivery reliability.
Data Source
AI summary
According to an example implementation, a method may include transmitting, by a user device to a base station in a wireless network, a system information request for on-demand system information during a random access procedure, where the system information request is a request for one or more parameters that enable the user device to communicate in the wireless network, receiving, by the user device from the base station, an indication of a wait period in which the user device waits before obtaining the on-demand system information, waiting, by the user device, a time duration during the wait period, and monitoring, by the user device after expiration of the wait period, a system information window in which a system information message having the on-demand system information is broadcasted by the base station.