Latency-Based Contention-Free Preamble Reuse in LTE Handover
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Solution Overview
Problem
In wireless networks, especially LTE, the limited number of contention-free preambles leads to increased likelihood of access collisions during handover processes, as UEs may inadvertently use the same preamble, causing delays and resource burdens on the air interface.
Innovation Solution
The method involves evaluating inter-base station latency to identify neighboring base stations with significantly different latency levels, allowing the same contention-free preamble to be assigned to UEs undergoing handovers from these stations, ensuring they transmit access requests at different times and avoiding collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of contention-free preambles is increased to avoid access collisions during handover, then the reliability of handover is improved, but the device complexity and resource management complexity increase
Solution Approach 1:
The patent changes the parameter of preamble assignment by introducing latency-based differentiation. Instead of uniformly assigning preambles, the system evaluates inter-base station latency metrics and assigns preambles accordingly, allowing same preambles to be reused when latency differences ensure temporal separation of access requests
Solution Approach 2:
The patent introduces dynamic preamble assignment based on real-time latency evaluation. The base station continuously monitors latency metrics to neighboring base stations and dynamically determines which preambles can be safely reused, making the preamble management system adaptive rather than static
2Quantity of substance
If latency-based preamble reuse is implemented to conserve preamble resources, then the quantity of preambles required is reduced, but the device complexity increases due to latency evaluation requirements
Solution Approach 1:
The base station performs self-service by autonomously evaluating its own latency relationships with neighboring base stations and making independent decisions about preamble reuse. This eliminates the need for complex centralized coordination or additional signaling infrastructure
Solution Approach 2:
The system implements feedback mechanisms where the base station continuously monitors latency metrics from neighboring base stations and uses this feedback information to dynamically adjust preamble assignment decisions, creating a closed-loop control system
3Reliability
If more preambles are allocated for random access to reduce collisions, then the access reliability is improved, but the loss of time for resource allocation increases
Solution Approach 1:
The patent applies preliminary action by pre-evaluating latency relationships between base stations before handover events occur. The base station maintains updated latency metrics to neighboring base stations in advance, so when handover requests arrive, preamble assignment can be made quickly without real-time calculation delays
Data Source
AI summary
A base station is configured for latency-based contention free preamble reuse. The base station determines the latency between it and each of a plurality of neighboring stations and, in response to receiving two different handover requests for two different UEs from two different neighboring base stations, the base station assigns one contention free preamble for use by both of the two UEs based at least in part on respective latencies from the base station to each of the two different neighboring base stations.