RRC Connection Release Wait Timer for LTE Congestion
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Solution Overview
Problem
In LTE systems, when an eNB needs to release an RRC connection due to congestion or other reasons, it lacks the means to indicate a wait time for the UE to retry the connection setup, leading to premature re-attempts or aborting of procedures.
Innovation Solution
Incorporating a wait timer indication in the RRCConnectionRelease message to specify the duration for the UE to wait before re-initiating the RRC connection request, allowing the UE to set a timer and retry the connection setup only after its expiration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the eNB releases the RRC connection without providing wait time information, then the release procedure is simple and fast, but the UE may retry connection setup prematurely or abort procedures unnecessarily
Solution Approach 1:
The eNB performs preliminary action by indicating the wait time in the RRCConnectionRelease message before the UE attempts reconnection. This allows the UE to know in advance when it should retry the connection setup, preventing premature attempts and improving connection reliability without adding complex procedures.
Solution Approach 2:
The waitTime parameter acts as an intermediary element between the eNB and UE. It carries the timing information that coordinates the reconnection behavior, serving as a simple yet effective mediator that resolves the contradiction between maintaining simple signaling and ensuring reliable connection setup.
2Productivity
If the UE immediately retries connection setup after release, then connection establishment speed is maximized, but network congestion may worsen and resource waste increases
Solution Approach 1:
The solution implements periodic action by having the UE wait for a specified duration before retrying connection setup. The waitTime parameter defines this periodic interval, allowing the network to manage congestion by spacing out reconnection attempts while still enabling relatively quick reestablishment once the wait period expires.
Solution Approach 2:
The eNB performs preliminary action by calculating and communicating the appropriate wait time before the UE retries connection. This preliminary timing coordination prevents the UE from immediately retrying and potentially worsening congestion, while still maintaining efficient connection establishment once the network is ready.
3Reliability
If the UE waits for an extended period before retrying, then network congestion is reduced and resource availability improves, but connection establishment latency increases
Solution Approach 1:
The solution applies dynamics by making the wait time flexible rather than fixed. The eNB dynamically determines the appropriate waitTime based on current network conditions, congestion levels, and resource availability. This allows the system to adapt the waiting period to balance network availability improvements against acceptable connection establishment latency for different scenarios.
Solution Approach 2:
The waitTime parameter is changed dynamically by the eNB based on network state. Rather than using a static wait period, the eNB adjusts this parameter to optimize the balance between reducing congestion (improving reliability) and minimizing wait time (reducing latency loss) according to real-time network conditions.
Data Source
AI summary
Disclosed is a method that includes receiving, when in a radio resource control (RRC) Connected state, a RRC connection release message from a network access node; setting a wait timer in accordance with a wait timer indication that comprises part of the RRC connection release message; and upon an expiration of the wait timer, enabling the initiating of sending an RRC connection request message to the network access node. Also disclosed is a method that includes operating a network access node with mobile node and sending a RRC connection release message to the mobile node. The RRC connection release message comprises a wait timer indication for specifying an amount of time that the mobile node should wait before initiating the sending of a RRC connection request message. Various apparatus and computer programs stored on non-transitory computer-readable medium are disclosed that are configured to execute the methods.