DE102004045426A1 - Quality of service and load balancing method for radio network involves control system which securely sets quality of service of radio communication from mobile stations to access points - Google Patents
Quality of service and load balancing method for radio network involves control system which securely sets quality of service of radio communication from mobile stations to access points Download PDFInfo
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- DE102004045426A1 DE102004045426A1 DE102004045426A DE102004045426A DE102004045426A1 DE 102004045426 A1 DE102004045426 A1 DE 102004045426A1 DE 102004045426 A DE102004045426 A DE 102004045426A DE 102004045426 A DE102004045426 A DE 102004045426A DE 102004045426 A1 DE102004045426 A1 DE 102004045426A1
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- 238000004891 communication Methods 0.000 title claims abstract description 9
- 230000005540 biological transmission Effects 0.000 claims abstract description 12
- 108091007065 BIRCs Proteins 0.000 claims description 5
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/08—Load balancing or load distribution
- H04W28/086—Load balancing or load distribution among access entities
- H04W28/0861—Load balancing or load distribution among access entities between base stations
- H04W28/0862—Load balancing or load distribution among access entities between base stations of same hierarchy level
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/08—Load balancing or load distribution
- H04W28/09—Management thereof
- H04W28/0958—Management thereof based on metrics or performance parameters
- H04W28/0967—Quality of Service [QoS] parameters
- H04W28/0983—Quality of Service [QoS] parameters for optimizing bandwidth or throughput
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- Quality & Reliability (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
Die Erfindung betrifft die Sicherstellung der Dienstgüte (Quality of Service, QoS) in WLAN-Systemen (Basis IEEE 802.11) durch ein Load Balancing-Verfahren unter Verwendung eines Kommunikationsprotokolls auf der Basis des Session Initiation Protocols (SIP) sowie spezieller Kommunikationsgeräte (Intelligent Access points, IAP).The The invention relates to ensuring the quality of service (Quality of Service, QoS) in WLAN systems (based on IEEE 802.11) Load balancing method using a communication protocol based on the Session Initiation Protocol (SIP) as well as more specific communications equipment (Intelligent Access Points, IAP).
Funknetzwerke (Wireless LAN, WLAN) wurden als Erweiterung drahtgebundener Netzwerke (Local Area Network, LAN) entwickelt. Heutige WLAN-Systeme richten sich nach den vom Institute of Electrical and Electronics Engineers (IEEE) veröffentlichten Normen mit der Nummer 802.11. Diese Normen (Standards) beschreiben zellenorientierte Netzwerke. Jede (räumliche) Zelle des Netzwerkes wird durch einen Access Point (AP) versorgt. Der Access Point ist mit einem/dem drahtgebundenen Netzwerk verbunden und kann theoretisch beliebig viele mobile Stationen (STA) an das Netzwerk anbinden.Wireless Networks (Wireless LAN, WLAN) were used as an extension of wired networks (Local Area Network, LAN). Today's WLAN systems are aimed according to the Institute of Electrical and Electronics Engineers (IEEE) published Standards with the number 802.11. Describe these standards cell-oriented networks. Each (spatial) cell of the network becomes supplied by an access point (AP). The access point is with connected to a wired network and can theoretically connect any number of mobile stations (STA) to the network.
Die Übertragungs-Bandbreite des AP ist systembedingt begrenzt und wird auf die angeschlossenen mobilen Stationen (STA) aufgeteilt. Je nach Bandbreitenbedarf und Anzahl der mobilen Stationen kann es ab einer bestimmten Zahl angebundener STA zu einer Überlastung des AP führen. Als Ergebnis dieser Überlastung wird die Bandbreite pro STA so weit reduziert, dass die laufenden Anwendungen auf den STAs nicht mehr genügend Bandbreite zur Verfügung gestellt bekommen. Insbesondere bei Echtzeitanwendungen wie der Telephonie (Voice over IP, VoIP) oder der Videobildübertragung führt dies zu Störungen bis hin zum Abbruch der Anwendung.The transmission bandwidth The AP is system-limited and is connected to the connected divided into mobile stations (STA). Depending on the bandwidth requirements and Number of mobile stations can start at a certain number of connected STAs to an overload lead the AP. As a result of this overload The bandwidth per STA is reduced so much that the running Applications on the STAs no longer provided enough bandwidth to get. Especially for real-time applications like telephony (Voice over IP, VoIP) or the video picture transmission leads this to disturbances up to the termination of the application.
In WLAN-Installationen mit mehr als einem AP ist es möglich, dass sich STAs durch überschneidende AP-Zellen bewegen. In diesem Fall muss sich die STA bei dem zuletzt verwendeten AP ab- und bei dem räumlich/logisch/funktechnisch nächsten AP anmelden. Dieser Vorgang wird durch Messungen des Rauschabstandes (Signal to Noise Ratio, SNR) ausgelöst. Sobald der SNR einer bestehenden Verbindung einen Schwellenwert unterschreitet und ein AP mit einem höheren SNR existiert, wird dieser handover oder roaming genannte Vorgang ausgelöst. In diesem Fall kann es ebenfalls zu einer unkontrollierten Überlastung des neu verbundenen APs kommen.In WLAN installations with more than one AP, it is possible that STAs are overlapping Move AP cells. In this case, the STA must be at the last used AP and in the spatial / logical / radio technology next Login AP. This process is done by measurements of the signal to noise ratio (Signal to Noise Ratio, SNR). Once the SNR of an existing Connection falls below a threshold and an AP with a higher SNR exists, this handover or roaming process is called triggered. In this case, it can also lead to an uncontrolled overload of the newly connected APs.
Die derzeitigen Regeln des Standards IEEE 802.11 bieten keine Lösungen für die beschriebene Problematik.The Current rules of the IEEE 802.11 standard do not provide solutions to the problem described.
Aufgabe des hier beschriebenen Verfahrens ist die Kontrolle der Lastverteilung der Access Points in einem IEEE 802.11-WLAN-Netzwerk in der Weise, dass angeschlossenen mobilen Stationen (STA) durch ein Steuerungssystem eine für die jeweilige Anwendung notwendige Dienstgüte zugesichert werden kann.task The method described here is the control of the load distribution of the access points in an IEEE 802.11 wireless network in such a way that connected mobile stations (STA) by a control system one for the respective application necessary quality of service can be assured.
Die Aufgabe wird durch ein Lastverteilungsverfahren (Load Distribution Mechanism, LDM) ausgeführt von einen Lastverteilungssystem (Load Distribution System, LDS) gelöst, wie es nachfolgend beschrieben wird.The Task is solved by a load distribution method (load distribution Mechanism, LDM) from a load distribution system (LDS) solved, as described below.
In einer WLAN-Installation werden mobile Stationen (STAs) in überlappenden Bereichen von Access Points (APs) durch ein Load Distribution System verwaltet. Dabei werden zwei Kategorien von Komponenten des LDS unterschieden: Lastverteilungskomponenten und Lastzuweisungskomponenten. Die Lastverteilungskomponenten werden für einen Lastverteilungsmechanismus (Load Balancing Mechanism, LBM) und die Lastzuweisungskomponenten für einen Verfahren zur Sicherung der Dienstgüte (Quality of Service, QoS) benötigt.In In a WLAN installation, mobile stations (STAs) become overlapping Areas of Access Points (APs) through a Load Distribution System managed. There are two categories of components of the LDS distinguished: load distribution components and load allocation components. The load distribution components become for a load distribution mechanism (Load Balancing Mechanism, LBM) and the load allocation components for one Quality of service (QoS) assurance method needed.
Diese Komponenten können sowohl auf den mobilen Stationen als auch auf Netzwerkknoten (Server, Intelligente Access Points) installiert und in drei verschiedenen Architekturen verwendet werden: zentrale, verteilte und gemischte Architektur. Den Kern des LDS stellt der Load Distribution Manager (LDG) dar. Der LDG ist je nach Konfiguration für die Verwaltung eines gesamten Netzwerkes oder für einen Teil verantwortlich. In dem Fall, dass ein Netzwerk von mehreren LDGs verwaltet wird, können die LDGs untereinander kommunizieren und Lastdaten austauschen. Die Funktion der Komponenten auf den mobilen Stationen ist unabhängig von der verwendeten Architektur. Der LDG kann auf Servern oder auf Intelligenten Access Points (IAPs) verwendet werden.These Components can both on the mobile stations and on network nodes (servers, Smart Access Points) installed and in three different Architectures used: central, distributed and mixed Architecture. The core of the LDS is the Load Distribution Manager (LDG) Depending on the configuration, the LDG is for the management of an entire Network or for a part in charge. In the event that a network of several LDGs can be managed the LDGs communicate with each other and exchange load data. The function of the components on the mobile stations is independent of the architecture used. The LDG can be on servers or on Smart Access Points (IAPs) are used.
Die mobilen Stationen messen regelmäßig die Parameter der aktuellen Verbindung zum AP und übertragen diese Parameter regelmäßig oder ereignisausgelöst an den verwaltenden LDG. Die Stationen prüfen auch die Parameter anderer erreichbarer APs und übertragen diese Parameter gemeinsam mit den o. a. Daten der bestehenden Verbindung.The Mobile stations regularly measure the Parameters of the current connection to the AP and transmit these parameters regularly or event-triggered to the managing LDG. The stations also check the parameters of others reachable APs and transmit these parameters together with the o. a. Data of the existing connection.
Für die Sicherung der Dienstgüte (QoS) können ein dynamisches und ein statisches Bandbreitenzuordnungsverfahren verwendet werden. Beim statischen Verfahren muss die STA vor dem Start einer Datenübertragung beim LDG Bandbreite für die gesamte Verbindungsstrecke reservieren und kann erst nach Zuweisung der Bandbreite die Übertragung beginnen. Nach Ende der Übertragung muss die STA die reservierte Bandbreite wieder frei geben. Beim dynamischen Verfahren informiert die Station den LDG nur über die benötigte Bandbreite. Da dem LDG die Last aller APs bekannt ist, entscheidet der LDG nach dem implementierten Lastverteilungsalgorithmus (Load Distribution Algorithm, LDA) über die Lastverteilung. Diese Lastverteilung kann die Anweisung an bestimmte STAs beinhalten, den AP zu wechseln (Handover) oder den eigenen Bandbreitenbedarf zu reduzieren.For quality of service (QoS) assurance, dynamic and static bandwidth allocation techniques can be used. In the case of the static method, the STA must provide bandwidth for the LDG bandwidth before starting a data transmission Reserve entire link and can begin transmission only after allocation of the bandwidth. After the end of the transmission, the STA must release the reserved bandwidth again. During the dynamic procedure, the station only informs the LDG about the required bandwidth. Since the load of all APs is known to the LDG, the LDG decides according to the implemented load distribution algorithm (load distribution algorithm, LDA) via the load distribution. This load distribution may include the instruction to certain STAs to switch the AP (handover) or reduce their own bandwidth requirements.
Claims (10)
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102004045426A DE102004045426A1 (en) | 2004-09-18 | 2004-09-18 | Quality of service and load balancing method for radio network involves control system which securely sets quality of service of radio communication from mobile stations to access points |
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| DE102004045426A DE102004045426A1 (en) | 2004-09-18 | 2004-09-18 | Quality of service and load balancing method for radio network involves control system which securely sets quality of service of radio communication from mobile stations to access points |
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| DE102004045426A1 true DE102004045426A1 (en) | 2006-06-22 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006030157A1 (en) * | 2006-06-29 | 2008-01-03 | Zf Friedrichshafen Ag | Method and device for detecting a passive starting process in a motor vehicle |
| GB2574334A (en) * | 2016-06-10 | 2019-12-04 | Sophos Ltd | Combined security and QOS coordination among devices |
| US10667130B2 (en) | 2016-06-10 | 2020-05-26 | Sophos Limited | Combined security and QOS coordination among devices |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030139197A1 (en) * | 2001-11-19 | 2003-07-24 | At&T Corp. | WLAN having load balancing based on access point loading |
| US20040095914A1 (en) * | 2002-11-19 | 2004-05-20 | Toshiba America Research, Inc. | Quality of service (QoS) assurance system using data transmission control |
| GB2396782A (en) * | 2002-12-02 | 2004-06-30 | Samsung Electronics Co Ltd | Apparatus for controlling load balance of multi-access points in a wireless lan system and method thereof |
-
2004
- 2004-09-18 DE DE102004045426A patent/DE102004045426A1/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030139197A1 (en) * | 2001-11-19 | 2003-07-24 | At&T Corp. | WLAN having load balancing based on access point loading |
| US20040095914A1 (en) * | 2002-11-19 | 2004-05-20 | Toshiba America Research, Inc. | Quality of service (QoS) assurance system using data transmission control |
| GB2396782A (en) * | 2002-12-02 | 2004-06-30 | Samsung Electronics Co Ltd | Apparatus for controlling load balance of multi-access points in a wireless lan system and method thereof |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006030157A1 (en) * | 2006-06-29 | 2008-01-03 | Zf Friedrichshafen Ag | Method and device for detecting a passive starting process in a motor vehicle |
| GB2574334A (en) * | 2016-06-10 | 2019-12-04 | Sophos Ltd | Combined security and QOS coordination among devices |
| US10667130B2 (en) | 2016-06-10 | 2020-05-26 | Sophos Limited | Combined security and QOS coordination among devices |
| US10728759B2 (en) | 2016-06-10 | 2020-07-28 | Sophos Limited | Combined security and QOS coordination among devices |
| GB2574334B (en) * | 2016-06-10 | 2021-01-20 | Sophos Ltd | Combined security and QOS coordination among devices |
| US11178103B2 (en) | 2016-06-10 | 2021-11-16 | Sophos Limited | Combined security and QOS coordination among devices |
| US11936619B2 (en) | 2016-06-10 | 2024-03-19 | Sophos Limited | Combined security and QOS coordination among devices |
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