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WO2002060208A1 - Procede de transfert de liaisons de donnees a base radiotelephonique presentant certaines caracteristiques en matiere de qualite entre des stations radio fixes - Google Patents

Procede de transfert de liaisons de donnees a base radiotelephonique presentant certaines caracteristiques en matiere de qualite entre des stations radio fixes Download PDF

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Publication number
WO2002060208A1
WO2002060208A1 PCT/EP2002/000729 EP0200729W WO02060208A1 WO 2002060208 A1 WO2002060208 A1 WO 2002060208A1 EP 0200729 W EP0200729 W EP 0200729W WO 02060208 A1 WO02060208 A1 WO 02060208A1
Authority
WO
WIPO (PCT)
Prior art keywords
radio
qos
data
rbs2
free
Prior art date
Application number
PCT/EP2002/000729
Other languages
German (de)
English (en)
Inventor
Hans-Jochen Morper
Original Assignee
Siemens Aktiengesellschaft
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from EP01101728A external-priority patent/EP1227692A1/fr
Priority claimed from DE2001103334 external-priority patent/DE10103334A1/de
Application filed by Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO2002060208A1 publication Critical patent/WO2002060208A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/24—Negotiating SLA [Service Level Agreement]; Negotiating QoS [Quality of Service]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/26—Reselection being triggered by specific parameters by agreed or negotiated communication parameters

Definitions

  • the invention relates to a method for managing radio-based data connections with quality features according to the preamble features of patent claim 1 and to a data transmission system for carrying out a method.
  • radio communication systems for example the mobile radio system GSM (Global System for Mobile Communications), information such as voice, image information
  • GSM Global System for Mobile Communications
  • voice information such as voice
  • image information information such as image information
  • the radio interface serves as a connection between a base station and a multiplicity of subscriber stations, the subscriber stations, for example, mobile stations or fixed radio
  • the electromagnetic waves are emitted at carrier frequencies that lie in a frequency band provided for the respective system.
  • UMTS Universal Mobile Telecommunication System
  • future radio communication systems for example the UMTS (Universal Mobile Telecommunication System) or others
  • 30 3rd generation systems have frequencies in the frequency band of approx. 2000 MHz.
  • Two modes are provided for the third generation of mobile radio UMTS, one mode being based on FDD operation (Frequency Division Duplex) and the other mode on TDD operation (Time Division Duplex).
  • CDMA subscriber Support mer separation procedures Code Division Multiple Access
  • connections between a subscriber station and an access network are usually controlled using a point-to-point protocol (PPP).
  • PPP point-to-point protocol
  • the subscriber or the subscriber station establishing the connection is authenticated, which among other things.
  • the basis for a central settlement of accruing fees can be.
  • the RADIUS protocol (RADIUS: Remote Authentication Dial In User Service) is known for authentication purposes.
  • IP Internet Protocol
  • IP address of an HTTP server that enables a website to be called up conveniently "at the click of a mouse", including the address of a DNS (Domain Name Server), which determines the IP address belonging to a subscriber, and the address of an SMTP server (Simple Mail Transfer Protocol), which is necessary for the transmission of electronic messages, known as e-mail.
  • DNS Domain Name Server
  • SMTP server Simple Mail Transfer Protocol
  • IP Internet Protocol
  • a host When connecting a host to a network, for example a local data network (LAN - Local Area Network), the host is connected by a connection or access server using e.g. the so-called dynamic host configuration protocol (DHCP) assign an IP address under which the host in the network can be clearly identified and addressed.
  • DHCP dynamic host configuration protocol
  • addresses of auxiliary services important to him or of network components on which these services are executed are communicated to the host in this network.
  • a host is usually connected to a local network by wire, the last section of a wire-based access in newer networks being able to take place wirelessly by radio.
  • a local area network that supports the wireless connection of hosts is generally referred to as W-LAN (Wireless Local Area Network).
  • authentication and authorization of the connection-establishing host takes place, if at all, in an authentication and authorization server, which can optionally also enable central billing of fees incurred (AAA server).
  • the communication systems and networks described above thus differ in terms of many features, so that a direct connection of stations of one system with those of the other system is currently not possible.
  • a subscriber station of a telecommunication system must have one for the installation for an IP access c ⁇ ⁇ tt P> P 1
  • WLL Wireless Local Loop
  • Shared transmission media are much better suited for the transport of packet-switched data, in particular IP data, since they best meet the needs of an Internet service user for the transmission bandwidth (best effort).
  • VoIP Voice-Over-IP
  • QoS is guaranteed by the individual transmission medium itself, e.g. jitter and latency of an ISDN connection with a constant bit rate, in the case of a shared medium (shared Medium), e.g. a broadband air interface, not possible without QoS guarantees for individual connections without additional distribution algorithms.
  • a shared medium shared Medium
  • a data terminal device for example a mobile radio telephone
  • a terrestrial network device for the wireless connection of data terminal devices for example radio base station
  • this procedure for handing over the connection is also referred to as handover or handoff.
  • This handover may become necessary if, for example, a data terminal device area of one radio base station into which another is moved.
  • such a handover may also be necessary, particularly in the case of stationary use, in particular also in the case of wireless local loop, if the radio propagation conditions deteriorate, for example due to interference.
  • connection-oriented radio systems e.g. in an implementation according to the well-known DECT GAP standard, when selecting possible radio or radio base stations for which a handover would be possible in terms of radio technology, it is possible to select only those which have sufficient free transmission capacities.
  • a shared medium known as a shared medium
  • a data terminal connected to this medium receives every data packet that is transported via this medium, with several packet connections with different QoS being transmitted on the medium
  • the object of the invention is to propose a method and a data transmission system that enable a simple handover of QoS connections in a shared medium.
  • a fact advantageous for this method is that there are radio systems in which the initiative for a handover comes from the network units controlling the radio access devices, e.g. a so-called base station system in the GSM mobile radio system consisting of base station control (BSC - Base Station Controller) and base stations (BTS - Base Transceiver Station), as well as systems in which the initiative comes from the mobile, radio-connected data terminal equipment , e.g. PT (Portable Termination) in a DECT cordless telephone system.
  • BSC Base Station Controller
  • BTS Base Transceiver Station
  • the method can advantageously be used for both types of access, but is not limited to these.
  • Subscriber devices that communicate with one another via a packet-oriented radio interface / shared medium are advantageously determined by one or more parameters for at least one of these subscriber terminal requirements and / or resource consumption and / or free resources of the data stream via the radio interface between at least one subscriber terminal device and the network access device communicating therewith ,
  • Such a determination offers a simple possibility to ensure, prior to a handover, to select one or more of the network access devices or base stations which can alternatively be selected for a subscriber terminal device, which are for the desired service have sufficient resources available. It is particularly advantageous if the resource stocks, free resources and / or used resources can be determined directly, depending on the consideration when determining parameters in the area of the subscriber terminal device or the network access device.
  • Recording or determining the resource data in relation to corresponding data in the network access device enables the necessary parameters to be made available directly in the same device in which the data to be processed are generated.
  • a detection or determination of the resource data relating to corresponding data on the subscriber side, in particular in the subscriber terminal device, enables the determination of the resource requirement for a connection directly in the device, which has to request corresponding resources from a network access device.
  • one or more suitable radio-based network access devices can also be selected before the connection is established by comparing the corresponding parameters.
  • Describing at least one quality of service quality parameter, in particular latency or jitter, as a parameter by means of a prioritization constant offers a simple possibility to manage these essential quality features for the quality of service.
  • Determining at least one of the data streams by a data stream parameter in particular as a so-called data stream constant by the product of its prioritization constant and bandwidth, offers a value that uniquely describes the resource requirements of an individual connection.
  • the term constant may not be understood as a permanently fixed quantity, but rather as a fixed quantity for a current connection.
  • the total resource requirement of a network termination device can also be determined using a single communication parameter.
  • the total resource requirement is an important factor, since when a connection is passed on, not only a single connection from several connections is usually passed on to another network access device, but possibly also. several or even all currently existing connections must be forwarded.
  • the communication parameter advantageously results as a communication constant from the sum of the data stream constants of all data connections via this network termination device.
  • the resource consumption of a radio-based network access device is accordingly simply the sum of all
  • the totality of all free, in particular available free resources of a radio-based network access device can be determined in a simple manner from the difference between the total resources of this network access device and their used resources. This results in a quantity which is expediently referred to as the free constant.
  • the totality of all free resources of the radio-based network access devices can therefore be used in particular for decision can be used for the transfer of a radio connection to another radio-based network device.
  • Information about free resources of radio-based network devices can be communicated to a network termination device expediently via a general signaling channel with a so-called broadcast function or in a new or already existing message channel.
  • a network termination device expediently via a general signaling channel with a so-called broadcast function or in a new or already existing message channel.
  • Network access devices via a dialog, in particular a dialog initiated by the network termination device, to query the radio-based network devices.
  • Regularly updated information about free resources in radio-based network devices can be communicated to a network termination device each time a connection is established and / or when there are changes in the resource consumption in radio-based network access devices, in particular via messages.
  • the decision regarding the transfer of a radio connection can be made on the basis of the parameters, so that only a limited number of system devices have to be equipped or retrofitted accordingly.
  • the radio interface can in particular also in accordance with the Bluetooth standard, the DECT standard, the HomeRF standard, the IEEE 802.11 standard, the IEEE 802.Ilb standard, the IEEE 802.11a standard, the HiperLAN standard, the HiperLAN2 Standard, the GSM standard or the UMTS standard can be managed.
  • the QoS parameters can also be derived from DiffServ prioritizations.
  • the QoS parameters from the header data of a data packet e.g. the well-known Type-Of-Service (TOS) field of an IP CO O>
  • TOS Type-Of-Service
  • the data network can in particular be a PSTN / ISDN telecommunication network, a broadband telecommunication network (xDSL), a mobile radio network, in particular 1st, 2nd or 3rd generation, a local data network (LAN) or be a television network.
  • xDSL broadband telecommunication network
  • LAN local data network
  • the subscriber side e.g. also be designed as a "wireless local loop" access network.
  • FIGS. 2A and 2B show a schematic structure of a telecommunication network with a device for dial-up connections to Internet access in the implementation of the wired access or with the aid of a so-called wireless local loop system,
  • Fig. 3 shows a concrete embodiment
  • a telecommunication system or network preferably has wired subscriber devices, for example telephones T and computers or hosts H connected via a modem device.
  • the telecommunication system can be, for example, an integrated services digital communications network ISDN (Integrated Services Digital Network), a conventional public switched telephone network PSTN (Public Switched Telephone Network) or a digital xDSL system (DSL: Digital Subscriber Line).
  • ISDN Integrated Services Digital Network
  • PSTN Public Switched Telephone Network
  • DSL Digital Subscriber Line
  • Bluetooth radio access protocol Bluetooth radio AP
  • It is a very simple protocol that only supports a point-to-point connection between two devices currently communicating with each other. It is therefore much simpler than the protocols used in cellular radio systems.
  • a radio interface based on the IEEE 802.11 standard can be used in such systems.
  • Such a data network (W-) LAN can also have one or more service servers, in particular with the logical devices described below, e.g. a domain name server DNS.
  • service servers in particular with the logical devices described below, e.g. a domain name server DNS.
  • DNS domain name server
  • An HTTP server allows the subscriber to access the Internet pages selected by him "with a click of the mouse" without having to know the specific IP addresses of the respective providers.
  • DHCP dynamic host configuration protocol
  • W- data network
  • DHCP server when a host H is connected to the data network (W-) AN, an address, in particular IP address, is assigned, under which the newly added host H im Network can be clearly identified and addressed is. In most cases, the address assignment is variable, so that the address space, which is only available to a limited extent internationally for all hosts H, is not exhausted.
  • the DHCP server can advantageously assign IP addresses for a limited time, so that a host H must request a new IP address after a specified time.
  • the access server AS can have an authentication and authorization server (AA server), which, as an accounting server (AAA server), can optionally also enable central billing of fees incurred.
  • AA server authentication and authorization server
  • AAA server accounting server
  • server devices can be used to connect to networks such as the Internet, for example so-called P0P3 servers and / or SMTP servers (SMTP: Simple Mail Transfer Protocol), which are used to exchange electronic letters (emails).
  • networks such as the Internet, for example so-called P0P3 servers and / or SMTP servers (SMTP: Simple Mail Transfer Protocol), which are used to exchange electronic letters (emails).
  • P0P3 servers and / or SMTP servers Simple Mail Transfer Protocol
  • service selection gateway Service Selection Gateway
  • SSG Service Selection Gateway
  • SNMP Simple Network Management Protocol
  • a commercially available standard host WH with a central processing device CPE and a network interface card NIC (Net Interface Card) can continue to communicate via a radio interface V with a commercially available bridge (AP).
  • Existing protocols can be used for DHCP access, such as 802.11 or a HyperLAN radio access protocol.
  • the bridge forms the interface between, for example, the protocols for data network radio interfaces (802.11) and data network cable interfaces (802.3).
  • a second communication QoS constant can be determined, which enables a statement about all resources used on a radio base station RBS1, RBS2, by the QoS parameters of all network termination devices RNTx communicating with this base station RBS2 or RBS2 , adds up, which in the example leads to the sums QoS-RBSl-Used or QoS-RBS2-Used.
  • a further, third total constant can be determined, which enables a statement about the total available resources of this base station, in the example QoS-RBSl-total or QoS-RBS2 total.
  • the still free, unused resources of a base station then result as a further free constant QoS-RBSx-Free from the difference of the constants that characterize the total (QoS-RBSx-total) and the used resource reserve (QoS-RBSx-Used), in the example QoS-RBSl-Free or QoS-RBS2-Free.
  • this value is communicated to the connected network termination devices RNTx, these can determine, by determining their own resource requirements QoS-RNTx, whether a radio base station RBSx in the event of a handover can provide the necessary QoS requirements for all data connections from connected network termination devices RNTx can.
  • An advantageous embodiment of this method consists in sending the corresponding free constants QoS-RBSx-Free via broadcast messages in a broadcast channel, for example the BCCH, or in a separate or already existing message or signaling channel. Such channels are known for example in the case of the GSM standard for various types of messages.
  • a further, advantageous embodiment consists in that a network termination device RNT queries the corresponding parameters if necessary via an inquiry to a potential target radio base station RBS.
  • a corresponding control unit in the network e.g. in or the Mobile Switching Center (MSC in GSM)

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé de gestion de liaisons de données à base radiotéléphonique ayant des exigences individuelles en matière de qualité (QoS) entre des dispositifs réseau à base radiotéléphonique (RBS, RNT ; RBS1, RBS2, RNT1, RNT2, RNT3) après prise en compte d'exigences correspondantes en matière de qualité. Ledit procédé est appliqué dans un système de transmission de données, présentant au moins un dispositif d'accès réseau à base radiotéléphonique (RBS ; RBS1, RBS2) et au moins un dispositif d'abonné à base radiotéléphonique (RNT ; RNT1, RNT2, RNT3). Ces dispositifs communiquent entre eux par l'intermédiaire d'une interface radio (V) constituant un support commun ('shared medium'), dans lequel chacun des divers terminaux de données (H, W-H) relié à un dispositif terminal d'abonné (RNT) peut recevoir chaque paquet de données envoyé par le dispositif d'accès réseau à base radiotéléphonique (RBS) via cette interface radio (V). Selon la présente invention, on peut améliorer la gestion des ressources, en particulier pour un transfert (handover), en déterminant des besoins permanents en ressources et/ou l'utilisation de ressources et/ou les ressources libres du flux total de données à l'aide d'un ou de plusieurs paramètres, par l'intermédiaire de l'interface radio (V) entre un dispositif terminal d'abonné (RNT ; RNT1, RNT2, RNT3) et le dispositif d'accès réseau (RBS ; RBS1, RBS2) en communication avec ce dernier.
PCT/EP2002/000729 2001-01-25 2002-01-24 Procede de transfert de liaisons de donnees a base radiotelephonique presentant certaines caracteristiques en matiere de qualite entre des stations radio fixes WO2002060208A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP01101728.2 2001-01-25
DE10103334.6 2001-01-25
EP01101728A EP1227692A1 (fr) 2001-01-25 2001-01-25 Procédé de transfert des connexions de données par radio avec des caractéristiques de qualité entre des stations de base radio
DE2001103334 DE10103334A1 (de) 2001-01-25 2001-01-25 Verfahren zur Übergabe von funkbasierten Datenverbindungen mit Qualitätsmerkmalen zwischen Funkbasisstationen

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WO2002060208A1 true WO2002060208A1 (fr) 2002-08-01

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005122622A1 (fr) * 2004-06-07 2005-12-22 Nortel Networks Limited Transferts et selection de transfert dans un reseau d'acces sans fil

Citations (6)

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US5497504A (en) * 1994-05-13 1996-03-05 The Trustees Of Columbia University System and method for connection control in mobile communications
GB2313258A (en) * 1996-05-17 1997-11-19 Motorola Ltd Cell handover in a multimedia cellular communications system; multimedia conferencing system
US5912885A (en) * 1996-02-22 1999-06-15 Nokia Mobile Phones Ltd. Method for establishing radio connection as part of an ATM network
WO1999051052A1 (fr) * 1998-04-01 1999-10-07 Telefonaktiebolaget Lm Ericsson (Publ) Selection de cellules dans des systemes radio mobiles
WO2000016577A1 (fr) * 1998-09-14 2000-03-23 Nokia Mobile Phones Ltd. Transfert entre des reseaux de communication mobile
WO2000036863A1 (fr) * 1998-12-17 2000-06-22 Cisco Systems, Inc. Procede et systeme d'allocation de largeur de bande dans un reseau de communications sans fil

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Publication number Priority date Publication date Assignee Title
US5497504A (en) * 1994-05-13 1996-03-05 The Trustees Of Columbia University System and method for connection control in mobile communications
US5912885A (en) * 1996-02-22 1999-06-15 Nokia Mobile Phones Ltd. Method for establishing radio connection as part of an ATM network
GB2313258A (en) * 1996-05-17 1997-11-19 Motorola Ltd Cell handover in a multimedia cellular communications system; multimedia conferencing system
WO1999051052A1 (fr) * 1998-04-01 1999-10-07 Telefonaktiebolaget Lm Ericsson (Publ) Selection de cellules dans des systemes radio mobiles
WO2000016577A1 (fr) * 1998-09-14 2000-03-23 Nokia Mobile Phones Ltd. Transfert entre des reseaux de communication mobile
WO2000036863A1 (fr) * 1998-12-17 2000-06-22 Cisco Systems, Inc. Procede et systeme d'allocation de largeur de bande dans un reseau de communications sans fil

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Title
ROCH GUERIN ET AL: "EQUIVALENT CAPACITY AND ITS APPLICATION TO BANDWIDTH ALLOCATION IN HIGH-SPEED NETWORKS", IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS, IEEE INC. NEW YORK, US, vol. 9, no. 7, 1 September 1991 (1991-09-01), pages 968 - 981, XP000272772, ISSN: 0733-8716 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005122622A1 (fr) * 2004-06-07 2005-12-22 Nortel Networks Limited Transferts et selection de transfert dans un reseau d'acces sans fil
US8909226B2 (en) 2004-06-07 2014-12-09 Apple Inc. Handoffs and handoff selection in a wireless access network

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