Adaptive Dormancy Timer for LTE Control Channel Optimization
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Solution Overview
Problem
LTE systems face inefficiencies in managing access and control channel signals, particularly in maintaining RRC connections, which lead to RF bottlenecks and reduced network capacity for thin traffic connections like instant messaging and online discussions.
Innovation Solution
Implementing an adaptive dormancy timer in user devices and base stations that classifies access and control channel signals into two classes, adjusting the timer's value based on signal utilization thresholds to optimize the dormant state of user devices, thereby reducing unnecessary resource allocation and enhancing network capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RRC connections are maintained for thin traffic connections, then access/control channel availability is improved, but control channel overhead increases and network capacity decreases
Solution Approach 1:
The patent implements a dynamic dormancy timer mechanism that adapts its value based on traffic patterns. The timer is adjusted between different values (e.g., first value for data-intensive traffic, second value for access/control-intensive traffic) based on the classification of incoming signals. This dynamic adjustment allows the system to optimize the balance between maintaining RRC connections and releasing them, thereby improving access/control channel availability while preventing excessive control channel overhead and preserving network capacity.
2Productivity
If RRC connections are frequently set up and released, then control channel overhead is reduced, but access/control channel availability deteriorates
Solution Approach 1:
The system employs a feedback mechanism where the dormancy timer value is continuously adjusted based on the classification of received signals. When access/control channel signals are detected, the timer is set to a longer value to maintain the RRC connection, ensuring availability. When data channel signals dominate, the timer is reduced to allow connection release, improving control channel efficiency. This feedback-driven adaptation resolves the contradiction by making the connection management responsive to actual traffic needs.
3Reliability
If dormancy timer value is increased, then RRC connection maintenance is improved, but control channel overhead increases
Solution Approach 1:
The patent changes the parameter of the dormancy timer value based on traffic classification. For access/control channel intensive traffic, the timer is set to a larger value to maintain connections and reduce setup overhead. For data channel intensive traffic, the timer is set to a smaller value to allow timely connection release and reduce control channel overhead. This parameter adaptation resolves the contradiction by optimizing the timer value for the specific traffic type being handled.
Data Source
AI summary
A device classifies access or control channel signals into a first class or a second class, initializes a dormancy timer associated with the device, and sets the dormancy timer to a default value. The device also sets a signal target utilization threshold, receives actual signals via the access or control channel, and identifies, when a number of the actual signals exceeds the signal target utilization threshold, a particular signal, from the actual signals, as belonging to the first class or the second class. The device further increases the default value of the dormancy timer when the particular signal belongs to the first class, and decreases the default value of the dormancy timer when the particular signal belongs to the second class.