LTE-WLAN Aggregation QoS Provisioning via Access Category Mapping
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Solution Overview
Problem
Current LTE-WLAN interworking approaches face limitations in reacting to dynamic radio conditions and aggregating IP flows, leading to performance shortcomings in Quality of Service (QoS) provisioning, especially in managing radio resources and traffic granularity.
Innovation Solution
The method involves configuring LTE-WLAN aggregation (LWA) at the radio access network level, where LTE base stations and WLAN access points work together to ensure consistent access category classification based on QoS requirements, using mechanisms like VLAN tagging, DSCP mapping, and AC mapping to manage channel contention and data transmission effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If core network approaches like ANDSF are used for LTE-WLAN interworking, then operator policy support and subscriber specific service are improved, but reaction to dynamically varying radio conditions and IP flow aggregation capability deteriorate
Solution Approach 1:
The patent introduces a new intermediary entity (LWA controller or eNB) that acts as a mediator between the core network and WLAN access points. This intermediary receives QoS parameters from the core network and translates them into WLAN-specific QoS parameters, enabling both core network policy support and rapid response to radio conditions without requiring core network changes.
Solution Approach 2:
The patent segments the QoS provisioning function into separate layers: core network handles high-level policy decisions while the LWA controller/eNB handles real-time QoS parameter translation and WLAN-specific QoS management. This segmentation allows each layer to operate independently at its optimal speed and capability level.
2Productivity
If LWA integrates protocol stacks of LTE and WLAN systems, then resource control and system capacity are improved, but device complexity and QoS management difficulty increase
Solution Approach 1:
The patent extracts the complex QoS mapping and translation functions from the UE device and places them in the network side (LWA controller or eNB). The UE only needs to implement basic LWA functionality while the network handles the complex QoS parameter translation, reducing device complexity while maintaining aggregate throughput benefits.
Solution Approach 2:
The LWA controller serves as an intermediary that manages the integrated protocol stacks and QoS parameters, shielding the UE from complexity. The controller translates between LTE QoS parameters and WLAN QoS parameters, allowing protocol stack integration benefits to be realized without proportionally increasing UE device complexity.
3Productivity
If LWA is configured for data aggregation, then system capacity and resource utilization are improved, but QoS provisioning consistency across LTE and WLAN links becomes more difficult
Solution Approach 1:
The patent applies parameter transformation by mapping QoS parameters from LTE domain (QCI, ARP) to WLAN domain (access categories, EDCA parameters). The LWA controller maintains QoS consistency by translating parameters while preserving the intended QoS characteristics across different radio access technologies.
Solution Approach 2:
The patent implements feedback mechanisms where the LWA controller monitors QoS performance on both LTE and WLAN links and adjusts QoS parameter allocation dynamically. This feedback loop ensures consistent QoS provisioning by detecting and correcting deviations in real-time across the aggregated links.
Data Source
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AI summary
LTE-WLAN aggregation (LWA) at the radio access network level promises significant gain in system capacity and user quality of experience (QoE). In order to support QoS over LWA, there is a need to develop mechanisms to ensure that the access category (AC) classification chosen by a wireless device (AP in the case of downlink, and UE in case of uplink) is consistent with the QoS requirements of the EPS bearer/DRB and/or subscriber profile to which the traffic belongs. The cellular LTE network can provision QoS for both downlink and uplink data flows that are transferred using LWA access.