LTE WiFi Offloading via Base Station PDCP Allocation
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Solution Overview
Problem
Current cellular and WiFi systems face challenges in providing efficient and predictable performance, especially in terms of capacity and coverage, particularly in integrated LTE-WiFi networks, where existing technologies struggle to optimize data transmission and ensure reliable connections.
Innovation Solution
The integration of LTE and WiFi systems through a radio access network element that allocates downlink PDCP packets based on link quality and loading, using a base station to offload packets to a WLAN link, and establishing an IP tunnel for secure and efficient data delivery, allowing concurrent use of both cellular and WiFi interfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If LTE and WiFi systems operate independently, then each system maintains its own performance characteristics, but the overall network capacity and coverage are limited
Solution Approach 1:
The patent combines LTE and WiFi systems into a unified radio access network where a base station can allocate downlink PDCP packets to either LTE or WiFi links based on link quality and loading conditions. This merging allows the network to aggregate capacity from both systems while maintaining centralized control through the base station, resolving the contradiction between increased network capacity and system complexity.
2Productivity
If WiFi offloading is implemented without centralized control, then WiFi capacity can be utilized, but network performance becomes unpredictable and difficult to manage
Solution Approach 1:
The patent implements a feedback mechanism where the base station receives radio link measurement information from the WLAN access point about link quality and loading conditions. Based on this feedback, the base station dynamically allocates downlink PDCP packets to either LTE or WiFi links, ensuring predictable and controllable network performance while maximizing data transmission efficiency.
3Productivity
If concurrent LTE and WiFi connections are established, then network throughput can be boosted, but IP address management and routing become complex
Solution Approach 1:
The patent introduces the base station as an intermediary that manages IP address allocation and routing for concurrent LTE and WiFi connections. The base station receives downlink PDCP packets, determines the appropriate link based on measurement information, and routes packets accordingly. This intermediary approach enables throughput boosting while centralizing IP address management to reduce complexity.
Data Source
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AI summary
A radio access network element includes a base station configured to: allocate, based on received radio link measurement information, at least a first portion of downlink packet data convergence protocol (PDCP) packets received at the base station for delivery to a user equipment over a wireless local area network (WLAN) link between a WLAN access point and the user equipment, the received radio link measurement information being indicative of at least one of a WLAN link quality and a loading of the WLAN link; and output the first portion of the received downlink PDCP packets to the WLAN access point for delivery to the user equipment over the WLAN link.