User Equipment Bandwidth Estimation for Network Selection
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Solution Overview
Problem
Current wireless communication systems, such as LTE and UMTS, face challenges in determining the optimal network selection between LTE and WiFi based on available bandwidth, especially in scenarios with multiple cells and varying signal strengths, which affects user equipment (UE) in selecting the best network for communication.
Innovation Solution
A method and apparatus for determining available bandwidth of a cell by estimating the link capacity and available fraction of cell resources using communication quality measurements and assistance information, allowing UE to compare achievable throughput with thresholds for network procedure decisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If UE uses signal strength as the sole criterion for network selection, then the selection process is simple, but the network selection accuracy deteriorates because multiple cells may have sufficient signal strength and other factors like available bandwidth are not considered
Solution Approach 1:
The patent transforms the network selection criterion from a single parameter (signal strength) to multiple parameters including available bandwidth, link capacity, and cell resource availability. This is achieved by having the UE estimate available bandwidth based on communication quality measurements and assistance information from the network, thereby improving selection accuracy without significantly complicating the process
Solution Approach 2:
The network provides assistance information to the UE in advance that contains data about available bandwidth and cell resources. This preliminary action allows the UE to make more accurate network selection decisions without having to perform complex real-time measurements of all network parameters, thus improving accuracy while maintaining ease of operation
2Measurement precision
If UE performs comprehensive bandwidth estimation using communication quality measurements and assistance information, then network selection accuracy is improved, but the complexity of the estimation process increases
Solution Approach 1:
The patent introduces assistance information as an intermediary that carries pre-processed network state data from the base station to the UE. This intermediary contains aggregated bandwidth and resource availability data that the UE can use directly, avoiding the need for the UE to perform complex independent measurements while still achieving accurate bandwidth estimation
Solution Approach 2:
The UE performs bandwidth estimation only when necessary for network selection decisions, rather than continuously monitoring all parameters. The estimation is triggered by specific events such as cell reselection or handover scenarios, reducing the overall complexity while maintaining accuracy when needed
3Measurement precision
If the network provides assistance information about available bandwidth to all UEs, then UE network selection accuracy is improved, but the network signaling overhead increases
Solution Approach 1:
The assistance information is segmented and provided selectively to specific UEs based on their needs and the current network conditions, rather than broadcasting to all UEs uniformly. The base station determines which UEs require assistance information and provides it only to those UEs, thereby reducing overall signaling overhead while maintaining accuracy for users who need it
Solution Approach 2:
The assistance information mechanism serves multiple functions: it provides bandwidth estimation data for network selection, supports cell reselection decisions, and enables handover optimization. This multi-functionality justifies the signaling overhead by deriving multiple benefits from a single information exchange mechanism
Data Source
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AI summary
Methods and apparatuses are provided for determining available uplink bandwidth as an achievable throughput for a link. An available link capacity of a link with a cell for a user equipment is estimated based on a communication quality measured in the cell. An available fraction of cell resources for the user equipment over the link is also estimated based at least in part on received assistance information. An available bandwidth of the cell is then estimated as an achievable throughput for the user equipment over the link as a function of the estimated available link capacity and the estimated available fraction of cell resources. Moreover, a network procedure can be performed based at least in part on comparing the achievable throughput to one or more thresholds.