T310 Timer Scaling for Heterogeneous Network Handover
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Solution Overview
Problem
In heterogeneous networks, fast-moving terminals experience high handover failure rates when attempting to connect to pico cells, leading to prolonged communication interruptions due to the expiration of timer T310 before passing through pico cell coverage.
Innovation Solution
A method is introduced to scale the timer T310 by multiplying or adding a scaling factor when specific conditions are met, such as approaching a small cell or exceeding a threshold speed, preventing unnecessary handovers and maintaining communication with the serving cell until the terminal passes through the small cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fast-moving terminals perform handover to pico cells, then network capacity is improved, but handover failure rate increases and communication interruption time increases
Solution Approach 1:
The patent applies dynamics by making the timer T310 value adjustable based on terminal speed. The network determines whether the terminal is moving at high speed and dynamically sets the timer T310 to a first value (longer duration) for fast-moving terminals and a second value (shorter duration) for slow-moving terminals. This dynamic adjustment allows the system to adapt to different mobility scenarios, preventing handover failures for fast-moving terminals while maintaining normal handover procedures for slow-moving terminals, thus resolving the contradiction between network capacity improvement and handover success rate.
Solution Approach 2:
The patent changes the parameter of timer T310 duration based on terminal speed conditions. By setting different timer values (first value vs. second value) according to whether the terminal is moving fast or slow, the system optimizes handover behavior for different mobility patterns. This parameter change enables fast-moving terminals to maintain connection longer during handover, reducing failure rates, while keeping the system efficient for slow-moving terminals.
2Reliability
If timer T310 is extended to prevent expiration for fast-moving terminals, then communication interruption is reduced, but resource utilization efficiency decreases
Solution Approach 1:
The patent applies local quality by applying different timer configurations to different terminal groups based on their mobility characteristics. Fast-moving terminals receive a longer timer T310 value to ensure communication continuity during handover, while slow-moving terminals use the standard or shorter timer value. This localized optimization ensures that the extended timer is only used where necessary (for fast-moving terminals), avoiding unnecessary resource consumption for slow-moving terminals and thus resolving the contradiction between communication continuity and resource efficiency.
Solution Approach 2:
The patent changes the timer T310 parameter based on terminal speed, setting it to a first value for fast-moving terminals and a second value for slow-moving terminals. This conditional parameter adjustment ensures that the longer timer duration is applied only when necessary to maintain communication continuity for fast-moving terminals, while avoiding extended timer usage for slow-moving terminals where it would waste resources, thereby resolving the contradiction between reliability and resource efficiency.
Data Source
AI summary
The present disclosure relates to a terminal operation method related to radio link failure (RLF) in a heterogeneous network, the method comprising: measuring a quality of a serving cell using a reference signal (RS) received from a serving base station; checking whether consecutive out-of-sync indications are received a predetermined number on a physical layer channel; and running a timer related to the RLF when the consecutive out-of-sync indications are received the predetermined number on the physical layer channel, wherein the timer is scaled when a timer scaling condition is met.