Multi-layer Switches Manage WLAN Voice Bandwidth

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Solution Overview

Problem

Current Wireless Local Area Networks (WLANs) face challenges in managing bandwidth for voice communications, experiencing capacity limitations and service gaps due to channel limitations, and require separate infrastructure management from wired Local Area Networks (LANs), which complicates operations and security, especially in environments where both wired and wireless devices need to coexist.

Innovation Solution

Implementing a system where a wired LAN serves as the backbone for a WLAN, using multi-layer switches to manage Wireless Access Points (WAPs) and differentiate between voice and data communications by analyzing packet contents and characteristics, ensuring sufficient bandwidth is allocated for voice communications through Class of Service (CoS) assignment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If WLANs are deployed to support portable devices, then wireless communication capability is improved, but data rate and bandwidth capacity deteriorate compared to wired LANs

Engineering Contradiction:

Improvewireless communication capabilityVSAvoiddata rate

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

The patent merges wired and wireless LAN operations under a single network infrastructure managed by multi-layer switches. The wired backbone and wireless access points are integrated into one unified system, allowing devices to seamlessly transition between wired and wireless modes while maintaining consistent QoS policies and bandwidth management across both mediums.

Inventive Principle:

Principle #5Merging (Combining)

2Area of stationary object

If separate infrastructure is used for WLAN and wired LAN, then wireless service coverage is improved, but management complexity and security operations worsen

Engineering Contradiction:

Improvewireless service coverage areaVSAvoidinfrastructure management complexity

Core Design Contradiction:

Area of stationary objectVSDevice complexity

Solution Approach 1:

The multi-layer switches perform multiple functions including wired LAN switching, wireless access point management, voice traffic identification, and QoS enforcement within a single device. This universal approach eliminates the need for separate management systems for wired and wireless networks, simplifying operations while maintaining comprehensive coverage.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Reliability

If WLAN capacity is increased to support voice communications, then voice service quality is improved, but capacity for data communications deteriorates

Engineering Contradiction:

Improvevoice communication qualityVSAvoiddata communication capacity

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent applies different QoS policies to different types of traffic based on their specific requirements. Voice traffic receives guaranteed bandwidth and low latency treatment through CoS markings and priority queuing, while data traffic is allocated remaining capacity. This localized quality approach ensures voice reliability without unnecessarily restricting data communication capacity.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The system dynamically adjusts bandwidth allocation parameters based on traffic type, using CoS markings to identify voice packets and applying different scheduling algorithms. Voice traffic is prioritized with guaranteed minimum bandwidth, while data traffic utilizes available capacity efficiently, allowing both services to coexist with optimal performance.

Inventive Principle:

Principle #35Parameter changes

4Reliability

If bandwidth is guaranteed for voice communications in WLAN, then voice service reliability is improved, but overall network flexibility and adaptability worsen

Engineering Contradiction:

Improvevoice service reliabilityVSAvoidnetwork flexibility

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The QoS system dynamically adjusts bandwidth allocation based on real-time network conditions and traffic patterns. While voice traffic receives guaranteed minimum bandwidth to ensure reliability, the remaining capacity is dynamically available for data communications. The system can adapt to changing demands, allowing flexible resource utilization while maintaining voice service quality.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS7372828B2Wireless access point management in a campus environment

Publication Date: 2008.05.13 AVAGO TECHNOLOGIES INTERNATIONAL SALES PTE LTD

AI summary

A Wireless Local Area Network (WLAN) is operated in conjunction with a wired Local Area Network (wired LAN) to service a premises, e.g., a campus setting. The wired LAN services the wired communication needs of the premises and serves as the wired backbone of the WLAN. A plurality of Wireless Access Points (WAPs) of the WLAN couple to the wired backbone and are serviced by the LAN. With this shared structure, wired network components, e.g., multi-layer switches, manage the operation of WLAN components, i.e., WAPs. Such management includes ensuring that the WAPs provide sufficient bandwidth to support wireless packetized voice communications. Additional management operations include WAP access, wireless terminal registration, and channel resource allocation, among others.