WO2008022069A1 - Commutation entre des réseaux à commutation de circuits et à commutation de paquets - Google Patents

Commutation entre des réseaux à commutation de circuits et à commutation de paquets Download PDF

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Publication number
WO2008022069A1
WO2008022069A1 PCT/US2007/075790 US2007075790W WO2008022069A1 WO 2008022069 A1 WO2008022069 A1 WO 2008022069A1 US 2007075790 W US2007075790 W US 2007075790W WO 2008022069 A1 WO2008022069 A1 WO 2008022069A1
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WO
WIPO (PCT)
Prior art keywords
switched network
packet
circuit
switched
radio resource
Prior art date
Application number
PCT/US2007/075790
Other languages
English (en)
Inventor
John Love
Zhijun Cai (Sam)
Original Assignee
Alcatel Lucent
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
Application filed by Alcatel Lucent filed Critical Alcatel Lucent
Publication of WO2008022069A1 publication Critical patent/WO2008022069A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0022—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
    • H04W36/00224—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies between packet switched [PS] and circuit switched [CS] network technologies, e.g. circuit switched fallback [CSFB]
    • 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
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H04W36/304—Reselection being triggered by specific parameters by measured or perceived connection quality data due to measured or perceived resources with higher communication quality

Definitions

  • This invention relates generally to communication systems, and, more particularly, to wireless communication systems.
  • Wireless communication systems typically include one or more base stations (or nodes-B) for providing wireless connectivity to mobile units in a geographic area (or cell) associated with each base station (or node -B).
  • Mobile units and base stations communicate by transmitting modulated radiofrequency signals over a wireless communication link, or air interface.
  • the air interface includes downlink (or forward link) channels for transmitting information from the base station to the mobile unit and uplink (or reverse link) channels for transmitting information from the mobile unit to the base station.
  • the uplink and downlink channels are typically divided into data channels, random access channels, broadcast channels, paging channels, control channels, signaling channels, and the like.
  • the uplink and downlink channels may be shared or dedicated.
  • the air interface may form part of a circuit or channel between the mobile unit and another entity.
  • two mobile units may be connected by a circuit or channel that includes a first air interface between a first mobile unit and a first base station that is coupled to a network, a circuit or channel within the network, and a second air interface between a second base station and a second mobile unit.
  • Networks are typically divided into two types: circuit-switched networks and packet switched networks.
  • a circuit switched network supports dedicated circuits (or channels) that are used for communication between nodes and terminals.
  • a circuit that is dedicated to a communication session in a circuit switched network cannot be used by other callers until the circuit is released and a new connection is set up. Even if no actual communication is taking place in a dedicated circuit, dedicated channels remain unavailable to other users for the duration of the communication session.
  • Channels that are available for new calls are referred to as idle channels.
  • Ordinary voice phone service is typically circuit-switched.
  • the telephone company may reserve a specific physical path from a calling party to the number of a called party for the duration of the call. During that time, no one else can use the physical lines involved.
  • packet switched networks split traffic data (e.g., digital representations of sound and/or computer data) into packets that are routed over a shared network. Each packet is individually addressed so packet switched networks do not require a dedicated path to help the packet find its way to its destination. Many pairs of nodes may therefore communicate concurrently over the same channel.
  • Some packet-switched networks such as the X.25 network, support virtual circuit-switching.
  • a virtual circuit- switched connection is a dedicated logical connection that allows sharing of the physical path among multiple virtual circuit connections.
  • Mobile units that have an existing wireless communication session in a network may handoff between different base stations in the network. For example, when a mobile unit roams from a cell served by a first base station in a circuit-switched network to a cell served by a second base station in the circuit-switched network, a handoff between the first and second base station may be triggered based on measurements of a pilot signal strength. Similarly, when a mobile unit roams from a cell served by a first node-B in a packet-switched network to a cell served by a second node -B in the packet-switched network, the communication session associated with the mobile unit may be handed off between the first and second node-B.
  • circuit-switched and packet switched networks therefore perform radio resource management independently of the other type of network, e.g., circuit-switched networks perform radio resource management for the cells in the circuit-switched network independently of considerations of cells in proximate packet switched networks.
  • circuit-switched networks perform radio resource management for the cells in the circuit-switched network independently of considerations of cells in proximate packet switched networks.
  • the absence of joint consideration of radio resources in circuit-switched and packet switched networks may limit the spectral efficiency of multiple cells that belong to different switching domains to a sub- optimal level.
  • the present invention is directed to addressing the effects of one or more of the problems set forth above.
  • the following presents a simplified summary of the invention in order to provide a basic understanding of some aspects of the invention. This summary is not an exhaustive overview of the invention. It is not intended to identify key or critical elements of the invention or to delineate the scope of the invention. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is discussed later.
  • a method for switching between circuit- switched and packet switched network domains.
  • One embodiment of the method includes generating, at a mobile unit, a trigger for handing off the mobile unit between a circuit switched network and a packet switched network based on at least one characteristic of at least one radio resource of the circuit-switched network and at least one characteristic of at least one radio resource of the packet-switched network.
  • the trigger may be generated within at least one of the circuit switched network or the packet switched network.
  • the generated trigger may then be received at entities in the network, such as base stations and/or nodes-B.
  • Figure 1 conceptually illustrates one exemplary embodiment of a wireless communication system, in accordance with the present invention
  • Figure 2 conceptually illustrates a first exemplary embodiment of a method of handing off a mobile unit between a circuit-switched and a packet-switched portion of a wireless communication system, in accordance with the present invention
  • Figure 3 conceptually illustrates a second exemplary embodiment of a method of handing off a mobile unit between a circuit-switched and a packet-switched portion of a wireless communication system, in accordance with the present invention.
  • the software implemented aspects of the invention are typically encoded on some form of program storage medium or implemented over some type of transmission medium.
  • the program storage medium may be magnetic (e.g., a floppy disk or a hard drive) or optical (e.g., a compact disk read only memory, or "CD ROM"), and may be read only or random access.
  • the transmission medium may be twisted wire pairs, coaxial cable, optical fiber, or some other suitable transmission medium known to the art. The invention is not limited by these aspects of any given implementation.
  • FIG. 1 conceptually illustrates one exemplary embodiment of a wireless communication system 100.
  • the wireless communication system 100 includes portions of both circuit-switched networks and packet-switched networks.
  • the portion of the circuit-switched network that is shown in Figure 1 includes one or more base stations 105 for providing wireless connectivity to one or more associated geographic areas that are conventionally referred to as cells 110.
  • the base stations 105 may also be configured to provide wireless connectivity to one or more sectors within the cells 110.
  • the base station 105 may provide wireless connectivity according to the core Code Division Multiple Access (CDMA2000) wireless air interface standard known as IxRTT (1 times Radio Transmission Technology), which is used to identify the version of the CDMA2000 radio technology that operates in a pair of 1.25 MHz radio channels (one times 1.25 MHz, as opposed to three times 1.25 MHz in 3xRTT).
  • CDMA2000 Code Division Multiple Access
  • IxRTT Radio Transmission Technology
  • Person of ordinary skill in the art having benefit of the present disclosure should appreciate that the illustrated embodiment is not intended to limit the present invention and the circuit-switched portion of the wireless communication system 100 may alternatively operate according to different standards and/or protocols.
  • Base station controllers (BSC) 115 may be used to coordinate the operation of the one or more base stations 105.
  • the base station controller 115 includes a circuit- switched radio resource management function (CS-RRM) 120 that is responsible for managing call admission, handoff, maintaining quality of service, as well as other tasks known to persons of ordinary skill in the art.
  • the circuit-switched radio resource management function 120 may perform its designated functions based upon information associated with air interfaces supported by the base stations 105, radio resource management rules, information indicating current and/or maximum network capacities, and the like.
  • the circuit-switched radio resource management function 120 may determine whether to admit or handoff a new call to the base station 105 based on reverse link quality measurements, radio resource management rules that may be applied to the call, current network capacity, an anticipated quality of service for the admitted or handed off call, and the like.
  • the circuit-switched radio resource management function 120 may determine whether to admit or handoff a new call to the base station 105 based on a measured power of a pilot signal provided by the circuit-switched network.
  • the portion of the packet-switched network that is shown in Figure 1 includes one or more nodes-B 125 for providing wireless connectivity to one or more associated cells 130.
  • the nodes-B 125 may also be configured to provide wireless connectivity to one or more sectors within the cells 130.
  • the nodes-B 125 may provide wireless connectivity according to the Evolution-Data Optimized or Evolution-Data Only (EV-DO) standards and/or protocols, which have been standardized by 3rd Generation Partnership Project 2 (3GPP2) as part of the CDMA2000 family of standards.
  • EV-DO Evolution-Data Optimized or Evolution-Data Only
  • the EV-DO standards are typically classified as a broadband technology because it utilizes a broad band of radio frequencies and EV-DO employs multiplexing techniques such as CDMA as well as Frequency division duplex (FDD) to maximize the amount of data transmitted.
  • CDMA Code Division Multiple Access
  • FDD Frequency division duplex
  • Radio network controllers (RNC) 135 may be used to coordinate the operation of the one or more nodes-B 125.
  • the radio network controller 135 includes a packet-switched radio resource management function (PS-RRM) 140 that is responsible for managing call admission, handoff, maintaining quality of service, as well as other tasks known to persons of ordinary skill in the art.
  • PS-RRM packet-switched radio resource management function
  • the packet-switched radio resource management function 140 may perform its designated functions based upon information associated with air interfaces supported by the nodes-B 125, radio resource management rules, information indicating current and/or maximum network capacities, and the like.
  • the packet- switched radio resource management function 140 may determine whether to admit or handoff a new call to the nodes-B 125 based on reverse link quality measurements, radio resource management rules that may be applied to the call, current network capacity, an anticipated quality of service for the admitted or handed off call, and the like.
  • the packet-switched radio resource management function 140 may determine whether to admit or handoff a new call to the nodes-B 125 based on a measured power of a pilot signal provided by the packet-switched network.
  • the radio network controller 135 and the base station controller 115 may be able to communicate with each other, e.g. via wired and/or wireless connections (not shown) in the wireless communication system 100.
  • the messages exchanged between the radio network controller 135 and the base station controller 115 may be used to coordinate operation of the radio network controller 135 and the base station controller 115.
  • the messages may be formed and/or exchanged based on any communication standards, protocols, or combination thereof.
  • a mobile unit 145 is present in the wireless communication system 100.
  • a single mobile unit 145 is shown in Figure 1.
  • the mobile unit 145 is capable of forming wireless communication links with either the packet-switched portion of the wireless communication system 100 or the circuit-switched portion of the wireless communication system 100.
  • the mobile unit 145 is located in (or has roamed into) a region where the cell 110 overlaps with the cell 130.
  • the mobile unit 145 may establish concurrent wireless communication links with the packet-switched and the circuit-switched portions of the wireless communication system 100.
  • the packet- switched and circuit- switched radio resource management functions 120, 140 may jointly and/or dynamically determine which portion of the wireless communication system 100 should be used to provide wireless connectivity to the mobile unit 145, e.g., to provide the best spectral efficiency across multiple modulation types, coding, bands, multi-carrier systems, and the like. Triggers for handing off the mobile unit 145 between the circuit- switched and the packet-switched portions of the wireless communication system 100 can be based on characteristics of radio resources of the circuit-switched portion and/or characteristics of radio resources of the packet- switched portion of the wireless communication system 100.
  • the mobile unit 145 can perform measurements on the signals received over common pilot channels associated with the circuit-switched and the packet-switched portions of the wireless communication system 100. These measurements can be reported to the radio network controller 135 and/or the base station controller 115, which may use the measurements to evaluate different potential configurations. Alternatively, the radio network controller 135 and/or the base station controller 115 may perform measurements of signals received on the associated reverse links and use these measurements to evaluate the different potential configurations. The radio network controller 135 and/or the base station controller 115 may also use radio resource management rules, quality of service considerations, and the like to invite what the different potential configurations. The radio network controller 135 and the base station controller 115 may then jointly determine whether to handoff the mobile unit 145 to the circuit- switched portion or the packet- switched portion of the wireless communication system 100.
  • FIG. 2 conceptually illustrates a first exemplary embodiment of a method 200 of handing off a mobile unit (UE) between a circuit-switched and a packet-switched portion of a wireless communication system.
  • the mobile unit communicates with a base station controller (BSC) of a circuit-switched network and a radio network controller (RNC) of a packet-switched network.
  • BSC base station controller
  • RNC radio network controller
  • the method 200 illustrates a mobile-unit-initiated handoff from a circuit-switched portion of a wireless communication system to a packet-switched portion of the wireless communication system.
  • BSC base station controller
  • RNC radio network controller
  • the mobile unit receives (as indicated by the arrow 205) measurement control information from the base station controller over a broadcast channel.
  • the measurement control information may be communicated as an information element in a control message and may include information indicative of one or more reporting events, such as the thresholds that may be used to trigger a message that reports results of one or more measurements to the base station controller.
  • the mobile unit may then measure (at 210) pilot power strengths of pilot signals transmitted over forward links between the mobile unit and the circuit-switched portion of the network and the packet-switched portion of the network. Based on the reporting events trigger, the mobile unit reports (at 215) the measurement results to the radio resource management function implemented in the base station controller and/or the radio network controller.
  • the mobile unit may report (at 215) the measurement results if the pilot signal strength associated with the packet- switched domain exceeds the pilot signal strength associated with the circuit-switched domain.
  • the report includes information indicating a selected candidate cell, sector, carrier, and/or band in the packet-switched domain.
  • the radio resource management function in the base station controller may communicate (at 220) with the corresponding radio resource management function in the radio network controller.
  • the two radio resource management functions may communicate (at 220) to determine the radio resource status in the packet- switched domain. If the base station controller receives positive feedback from the radio network controller, indicating that sufficient radio resources are available to support handoff of the mobile unit to the packet-switched domain, the circuit-switched radio resource management sends (at 225) the radio resource management signaling message to the mobile unit that indicates that the requested handoff has been approved. The mobile unit may then accept or reject the decision.
  • the mobile unit sends (at 230) a request for the handoff to a control entity in the core network (not shown), e.g., via a non-access stratum procedure.
  • a packet-switched radio access bearer may then be formed (at 235) in response to the handoff request.
  • the radio access bearer may be formed (at 235) using the requested candidate packet-switched cell, sector, carrier, and/or band.
  • the mobile unit may initiate or form the packet-switched radio access bearer (at 240) and then remove or tear down (at 245) the circuit-switched radio access bearer to the base station controller.
  • the method 200 is a make-then-break (or soft handover) technique in which the mobile unit may maintain concurrent radio access bearers with the circuit-switched domain and the packet-switched domain during the handover procedure.
  • make-then-break or soft handover
  • FIG. 3 conceptually illustrates a second exemplary embodiment of a method 300 of handing off a mobile unit between a circuit-switched and a packet-switched portion of a wireless communication system.
  • the mobile unit communicates with a base station controller (BSC) of a circuit-switched network and a radio network controller (RNC) of a packet- switched network.
  • BSC base station controller
  • RNC radio network controller
  • the method 300 illustrates a network-initiated handoff from a circuit-switched portion of a wireless communication system to a packet-switched portion of the wireless communication system.
  • BSC base station controller
  • RNC radio network controller
  • the base station controller measures (at 305) reverse link quality measurements for the reverse link between the mobile unit and the circuit- switched portion of the network.
  • the radio network controller may also measure reverse link quality for the reverse link between the mobile unit and the packet-switched portion of the network. The base station controller then determines whether or not the reverse link quality measurements could trigger a potential handoff of the mobile unit to the packet-switched domain. For example, a handoff may be triggered when the reverse link quality measurements fall below a selected threshold. In some embodiments, the base station controller may also consider other characteristics when determining whether a potential handoff may be triggered.
  • the base station controller may consider radio resource management rules that may be applied to the call, current network capacity, an anticipated quality of service for the admitted or handed off call, and the like. Based on the reporting events trigger, the base station controller may transmit (at 310) a message indicating the potential handoff to the mobile unit.
  • the radio resource management function in the base station controller may also communicate (at 315) with the corresponding radio resource management function in the radio network controller.
  • the two radio resource management functions may communicate (at 315) to determine the radio resource status in the packet- switched domain. If the base station controller receives positive feedback from the radio network controller, indicating that sufficient radio resources are available to support handoff of the mobile unit to the packet-switched domain, the circuit-switched radio resource management sends (at 320) the radio resource management signaling message to the mobile unit that indicates that the handoff has been approved. The mobile unit may then accept or reject the decision.
  • the mobile unit sends (at 325) a request for the handoff to a control entity in the core network (not shown), e.g., via a non-access stratum procedure.
  • a packet- switched radio access bearer may then be formed (at 330) in response to the handoff request.
  • the radio access bearer may be formed (at 330) using the requested candidate packet-switched cell, sector, carrier, and/or band.
  • the mobile unit may initiate or form the packet-switched radio access bearer (at 335) and then remove or tear down (at 340) the circuit-switched radio access bearer to the base station controller.
  • the method 300 is a make-then-break (or soft handover) technique in which the mobile unit may maintain concurrent radio access bearers with the circuit-switched domain and the packet-switched domain during the handover procedure.
  • make-then-break or soft handover
  • Embodiments of the techniques described herein may have a number of advantages over conventional practice.
  • the voice call continuity switching triggers defined herein may be dependent on radio conditions such as signal-to-interference-plus-noise ratios (SINR) and/or the received energy (Ec/Nt) and therefore using these triggers for handoffs may improve the overall air link quality.
  • Embodiments of the techniques described herein may also be used to dynamically configure the handover triggers. In one embodiment, different system configurations may be transmitted over the broadcast control channel for measurement purposes or via a dedicated radio resource management message.
  • the mobile unit measures pilot channels for both systems and then reports these to the radio resource management functions on the circuit-switched and packet- switched networks, which may permit the two domains to coordinate handoff decisions.
  • the node-B and base stations in the circuit-switched and packet- switched domains may measure reverse link qualities and report these to one or more of the radio resource management entities so that handoff decisions may be coordinated between the circuit-switched and packet-switched domains.

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

Abstract

La présente invention propose un procédé pour commuter entre des domaines de réseau à commutation de circuits et à commutation de paquets. Un mode de réalisation du procédé comprend la génération, au niveau d'une unité mobile, d'un déclencheur pour transférer l'unité mobile entre un réseau à commutation de circuits et un réseau à commutation de paquets sur la base d'au moins une caractéristique d'au moins une ressource radio du réseau à commutation de circuits et d'au moins une caractéristique d'au moins une ressource radio du réseau à commutation de paquets. En variante, le déclencheur peut être généré à l'intérieur d'au moins l'un du réseau à commutation de circuits ou du réseau à commutation de paquets. Le déclencheur généré peut ensuite être reçu au niveau d'entités dans le réseau, telles que des stations de base et/ou des noeuds-B.
PCT/US2007/075790 2006-08-15 2007-08-13 Commutation entre des réseaux à commutation de circuits et à commutation de paquets WO2008022069A1 (fr)

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US82239606P 2006-08-15 2006-08-15
US60/822,396 2006-08-15

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012093955A1 (fr) * 2011-01-05 2012-07-12 Telefonaktiebolaget Lm Ericsson (Publ) Équilibrage de charge de données
CN103918342A (zh) * 2011-11-10 2014-07-09 阿尔卡特朗讯 服务链路建立

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WO2000041425A1 (fr) * 1998-12-31 2000-07-13 Telefonaktiebolaget Lm Ericsson (Publ) Recuperation d'informations cellule dans un reseau de radiotelecommunication superpose a commutation par circuits et par paquets
WO2001031963A1 (fr) * 1999-10-29 2001-05-03 Telefonaktiebolaget L M Ericsson (Publ) Transfert de terminal mobile d'un reseau de deuxieme generation vers un reseau ip de troisieme generation
WO2004010725A1 (fr) * 2002-07-22 2004-01-29 Telefonaktiebolaget L M Ericsson (Publ) Procede de commutation des communications dans un systeme cellulaire mobile
EP1424867A1 (fr) * 2002-11-29 2004-06-02 Nec Corporation Procédé de transfert intercellulaire dans un réseau de télécommunication multimode
US20050243870A1 (en) * 2004-04-14 2005-11-03 Balogh Dan A Method of transferring call transition messages between network controllers of different radio technologies

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000041425A1 (fr) * 1998-12-31 2000-07-13 Telefonaktiebolaget Lm Ericsson (Publ) Recuperation d'informations cellule dans un reseau de radiotelecommunication superpose a commutation par circuits et par paquets
WO2001031963A1 (fr) * 1999-10-29 2001-05-03 Telefonaktiebolaget L M Ericsson (Publ) Transfert de terminal mobile d'un reseau de deuxieme generation vers un reseau ip de troisieme generation
WO2004010725A1 (fr) * 2002-07-22 2004-01-29 Telefonaktiebolaget L M Ericsson (Publ) Procede de commutation des communications dans un systeme cellulaire mobile
EP1424867A1 (fr) * 2002-11-29 2004-06-02 Nec Corporation Procédé de transfert intercellulaire dans un réseau de télécommunication multimode
US20050243870A1 (en) * 2004-04-14 2005-11-03 Balogh Dan A Method of transferring call transition messages between network controllers of different radio technologies

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012093955A1 (fr) * 2011-01-05 2012-07-12 Telefonaktiebolaget Lm Ericsson (Publ) Équilibrage de charge de données
US9402206B2 (en) 2011-01-05 2016-07-26 Telefonaktiebolaget Lm Ericsson (Publ) Load balancing of data
CN103918342A (zh) * 2011-11-10 2014-07-09 阿尔卡特朗讯 服务链路建立
US20140321411A1 (en) * 2011-11-10 2014-10-30 Alcatel Lucent Service link establishment

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