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EP1142413A1 - Procede et systeme de transfert logiciel intersysteme - Google Patents

Procede et systeme de transfert logiciel intersysteme

Info

Publication number
EP1142413A1
EP1142413A1 EP99964853A EP99964853A EP1142413A1 EP 1142413 A1 EP1142413 A1 EP 1142413A1 EP 99964853 A EP99964853 A EP 99964853A EP 99964853 A EP99964853 A EP 99964853A EP 1142413 A1 EP1142413 A1 EP 1142413A1
Authority
EP
European Patent Office
Prior art keywords
transport
connection
radiocommunication
qos
attributes
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP99964853A
Other languages
German (de)
English (en)
Inventor
Shabnam Petersson Sultana
Lila Grimson Madour
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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 Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Publication of EP1142413A1 publication Critical patent/EP1142413A1/fr
Withdrawn legal-status Critical Current

Links

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
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0066—Transmission or use of information for re-establishing the radio link of control information between different types of networks in order to establish a new radio link in the target network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection

Definitions

  • the present invention generally relates to increasing data throughput and quality in a wireless communication system and, more particularly, to systems and methods involving adaptation of soft handoff between radiocommunication systems.
  • radiocommunication systems have been designed in accordance with various standards, e.g., adopted on a country-wide or region-wide basis, in order to provide a roadmap for technological and service compatibility.
  • D-AMPS ANSI136
  • GSM-type systems and ANSI 136 type systems are currently employed in the United States.
  • designers should also take into account existing standards in an effort to minimize the impact of design changes on the relevant standard(s) and legacy equipment.
  • systems offered by different manufacturers should also be able to provide inter-system radiocommunication service support.
  • a multi-link communication can be established, both in the up- as well as the downlink, so that two or more base stations communicate the same information to a mobile station over two different links.
  • the mobile station processes the signals from the two links by selecting or combining them in some way, e.g., maximal ratio combining. This technique is known as diversity or macrodiversity.
  • Diversity transmission can also be generated using one or more of an offset in time, polarization, frequency or code.
  • the candidate base station i.e., the base station to which a mobile station is to be handed off
  • the candidate base station starts transmitting substantially the same message information to the mobile station before the current, serving base station terminates its transmission of that J
  • FIG. 1 illustrates a soft handoff arrangement wherein a first, original base station 202 and a second, candidate base station 204 each transmit a same message 206 to a mobile station 208.
  • the message 206 is transmitted to the mobile station 208 over different signal paths in the forms of a first downlink 210 and a second downlink 212.
  • the first and second downlink signals 210 and 212 are recombined (or one of the received signals is selected) in the mobile station 208 to extract the message 206.
  • the mobile station 208 transmits to the base stations 202 and 204 over first and second uplink paths 214 and 216, respectively.
  • the transmission of message information to the mobile station from the first, original base station 202 is terminated and the soft handoff process is concluded.
  • the base stations and/or antennas communicating with a particular mobile station are known as "active set" members.
  • base stations 202 and 204 would be considered members of the active set.
  • Members of an active set can change as the mobile station passes into and out of coverage areas handled by base stations and/or antennas in the system.
  • Soft handoff has been used in many different types of radiocommunication systems, including those using time division multiple access (TDMA) and CDMA. Soft handoff increases robustness, achieves improved downlink quality, and combats fading. However, soft handoff between different systems, e.g., base stations associated with different mobile switching centers (MSCs) has not been given thorough consideration.
  • TDMA time division multiple access
  • CDMA Code Division Multiple Access
  • MSCs mobile switching centers
  • packet data e.g., ATM or IP
  • a handoff request message is sent to the target system(s).
  • the handoff message includes, among other parameters, at least one set of user plane attributes and at least one quality of service (QoS) values associated therewith. These attributes specify, at least in part, the possible mechanisms by which the anchor system is willing to establish the diversity connection.
  • the anchor system can specify two sets of user plane attributes: one set including Internet Protocol (IP) transport information and another set including asynchronous transfer mode (ATM) transport information. Transmitted along therewith may be associated QoS values, e.g., one or more for the IP transport mechanism and one or more for the ATM transport mechanism.
  • IP Internet Protocol
  • ATM asynchronous transfer mode
  • the recipient target system(s) may evaluate the received parameters and determine if their current resources and capabilities provide a match with one or more of the sets offered by the anchor system. If so, each target system sends a connection request indicating which set of attributes have been selected and a connection is set up to that system to enter the soft handoff mode. Otherwise, a target system which cannot accept the received parameters returns a rejection message.
  • Some parameters offered by the anchor system may be negotiable. For example, if a target system cannot provide the requested QoS, then it may return (with its rejection message) a suggested QoS under which it could provide service to the mobile station. If accepted by the anchor system, soft handoff mode may then be entered using this negotiated QoS.
  • exemplary embodiments of the present invention are adaptable to handoff between different access network technologies including, for example, W-LAN, bluetooth, x DSL, GSM, etc.
  • W-LAN wireless local area network
  • bluetooth wireless personal area network
  • x DSL wireless local area network
  • GSM global system for Mobile communications
  • FIG. 1 depicts a soft handoff mode of operation involving two base stations
  • FIG. 2 illustrates an exemplary intersystem soft handoff scenario which is used to illustrate soft handoff signaling according to the present invention
  • FIG. 3 is a signaling diagram illustrating exemplary signaling between two target systems and an anchor system in performing soft handoff according to an exemplary embodiment of the present invention.
  • FIG. 4 is a flowchart depicting steps of an exemplary soft handoff method according to an exemplary embodiment of the present invention.
  • FDMA frequency division multiple access
  • TDMA time division multiple access
  • CDMA code division multiple access
  • WLAN wideband local area networks
  • Bluetooth radio data communication and hybrids thereof.
  • a system in this document can be considered as a network including routers/ switches (MSC), gateways with conversion capabilities (media gateways), application nodes (or servers) such as call control or media control, services and management.
  • the system architecture uses the concept of separation of call control (media control), also referred to as the control plane, from the connection control >
  • a candidate protocol for intersystem call control protocol in exemplary embodiments is ANSI41. Given that this protocol is currently widely used by many wireless operators in the world, it would be easier to build on such an existing protocol rather than developing new protocols that require operator re-investment in new equipment. For example, SS7/IP gateways will soon exist where ANSI41 can be carried over IP in the protocol stack
  • ANSI41 is a standard promulgated by TIA/EIA for commumcation between different radiocommunication systems, i.e., between MSCs of different systems.
  • This standard describes various high level application services (referred to as the Mobile Application Part or MAP) including, for example, roaming, handoff, authentication, call delivery and teleservices (e.g., short message service).
  • MAP Mobile Application Part
  • MAP is at the top of a protocol stack defined for signaling between systems, which protocol stack also includes other familiar OSI layers associated with data transfer including a physical layer, a data link layer and a network layer, which layers can be implemented in a number of ways, e.g., using SS7 or X.25 protocols.
  • a base station 220 supports radiocommunication services in a first cell
  • base station 230 supports radiocommunication services in a second cell
  • base station 240 supports radiocommunication services in a third cell.
  • Each of the base stations 220, 230, and 240 are in communication with the rest of the fixed portion of the radiocommunication network via a respective mobile switching center (MSC) 250, 260 and 270.
  • MSC 250 is referred to as the “anchor" 2
  • each of the base stations and their respective systems may, for example, be embodied as optical links which transfer information using pulse code modulated (PCM) slots.
  • PCM pulse code modulated
  • the transmission of information between the base stations and, for example, mobile station 280 occurs over an air interface.
  • the air interface associated with the system depicted in Figure 2 operates using a CDMA technology with duplexed downlink (i.e. base-to- mobile direction) and uplink (i.e. mobile-to-base direction) channels.
  • a physical channel is identified by its code (i.e., short, long or combination thereof), frequency and bandwidth.
  • such an air interface can be that described in "Mobile Station-Base Station Compatibility Standard for Dual-Mode Wideband Spread Spectrum Cellular System, " TIA/EIA Interim Standard TIA/EIA/IS-95 (July-93) and its revision TIA/EIA Interim Standard TIA/EIA/IS-95-A (May 95) as set forth by the Telecommunications Industry Association and the Electric Industries Association located in Arlington, Virginia.
  • each mobile station will monitor the transmissions of neighboring sources, e.g., base stations, while it is connected to the system.
  • information regarding the received signal quality and/or strength is returned to the system and used to place these neighboring sources in that mobile station's candidate set.
  • one or more of the sources in the candidate set may be added to the active set.
  • the mobile station may enter a region wherein another transmission source (e.g., another base station) begins to transmit substantially the same information to that mobile station.
  • the mobile station can then combine the plural received signals to create a composite that has better quality than that which would have resulted from only receiving the information from one source.
  • the power control is fast enough to track the Rayleigh fading, soft handover will also reduce the interference in the system, which is particularly important in the uplink.
  • base stations 230 and 240 have been added to the mobile station 280's active set based on such monitoring. However, since base stations 230 and 240 belong to a different system than current serving base station 220, an intersystem soft handoff procedure according to the present invention is implemented as will now be described with respect to the signaling diagram of Figure 3 and flowchart of Figure 4 (which indicates some of the higher level functions performed by the signals of Figure 3).
  • the anchor system first decides that one or more cells at one or more target systems are needed to support the call in soft-handoff at step 400 ( Figure 4). This step is indicated by the HANDOFF REQUIRED message transmitted in Figure 3 from BS1 to MSC1 within the anchor system.
  • the anchor system sends a new soft handoff request operation SOFT_FACDIR Invoke to each target system (step 402).
  • the SOFT_FACDIR message as specified according to an exemplary embodiment of the present invention can include multiple parameters, for example, (1) the call ID of the connection, (2) the user plane attribute, (3) at least one quality of service (QoS) value, (4) the channel identity, (5) the cell identifier list (if more than one base station is to be added to the active list at a target system(s)), (6) band class, (7) the diversity unit ID, (8) the mobile station identification data (e.g., IMSI (international mobile station identifier), ESN (Electronic serial number)), (9) downlink signal strength, and (10) service option (or service configuration record).
  • QoS quality of service
  • each connection is assigned a reference number referred to above as the "call ID" by which number the connection can be tracked throughout a system.
  • the user plane attribute parameter contains information regarding various mechanisms by which user data can be transferred between the anchor system and the target system(s) including transport type (i.e., bearer), address type and address value.
  • transport types include: TCP/IP, Point-to-Point Protocol (PPP), IETF MPLS (Multi-protocol label switching), tunneling protocols such as IETF L2TP protocols, asynchronous transfer mode (ATM), etc.
  • Address types include, e.g., IPN4, IPV6, ATM ⁇ SAP, EJ64, etc. Then, corresponding to each address type, the SOFT FACDIR includes an address value for the anchor System.
  • the user plane attribute parameter can include a plurality of sets of (transport type, address type, address value) from which target system(s) can elect to receive/transmit data between the systems in a particular manner.
  • call control protocols according to the present invention allow both the anchor system and target system(s) to negotiate and establish which transport technology to use.
  • the quality of service (QoS) parameter included in the SOFT_FACDIR message will vary depending upon the type(s) of transport or routing protocols offered in the user plane attribute parameter.
  • each transport type identified in the user plane attribute parameter will have a set of corresponding QoS values in this part of the SOFT_FACDIR message (where the word "set" is inclusive of one).
  • the QoS parameter might include values associated with cell delay and cell peak delay for the ATM option and bit error rate and time delay for the IP transport option.
  • the channel identity parameter may be expressed as a channel number, frequency and/or spreading code associated with the connection.
  • the cell identifier list can include, for example, the coded digital verification color code (CDNCC), long scrambling code, etc., associated with a particular base station.
  • CDC coded digital verification color code
  • the band class indicates the frequency hyperband within which the mobile station is operating in regions which support multiple hyperbands, e.g., cellular and PCS bands.
  • the diversity unit ID identifies an address of the unit which performs the combining of received information on the uplink.
  • the downlink signal strength informs the target system(s) of the current transmit power at which the serving base station is transmitting on the downlink.
  • the service option provides information as described in TIA/TSB58.
  • the target system(s) receive the SOFT FACDIR and query the affected base stations using the Handoff request signal in Figure 3.
  • a determination is made (step 404) as to whether an acceptable set of parameters is being offered by the anchor system for the soft handoff, e.g., whether the user plane attribute and QoS parameters include values that each target system can support. If not, then a return error message (step 406) associated with the SOFT_FACDIR will be returned to the anchor system indicating, for example, congestion, service not available (attempt hard handoff), and/or transport type not supported by target system. Alternatively, the target system may request QoS negotiation based on a new QoS value.
  • the anchor system If the anchor system can support this new QoS value (step 407), then it is forwarded to the anchor system.
  • the anchor system may transmit a new SOFT_FACDIR message including the QoS value to the target system(s), i.e., indicating that the QoS value suggested by the target system(s) is acceptable to the anchor system.
  • each target system(s) selects one of the sets of available user plane attributes from the SOFT FACDIR message and a corresponding QoS.
  • the target system(s) can also verify the identified service option and validate the cell identifier list found in the SOFT_FACDIR.
  • the target system(s) will then send a new message SOFT CONNECT REQUEST (step 408) in response to the SOFT FACDIR to the anchor system including the selected transport attribute and the corresponding destination transport addresses of the target cell(s) (or base transceiver systems (BTSs)).
  • This message also includes a connection request using the provided transport address(es) to be setup.
  • the anchor system successfully acknowledges with a return result (no parameter included and not shown in Figure 3) and starts establishing the user plane connection(s) using the provided address(es) and transport protocols received from the target system(s) (step 410).
  • the anchor system could use one set of selected attributes to direct soft handoff connection data to a first target system and another set of selected attributes to direct soft handoff connection data to a second target system.
  • the anchor system starts forwarding user data frames to the target system(s) on each connection (step 412).
  • the frames are forwarded to the MS 280 on the forward traffic channel from each target cell.
  • the target system(s) also acquire reverse traffic channel(s) on the target cell(s).
  • the target system(s) will at this point send responses to SOFT_FACDIR (see Figure 3) back to the anchor system and wait for the handoff completion from the mobile station.
  • the mobile station will first receive a handoff direction message, e.g., as per IS-95, on the forward traffic channel from the anchor system following the response to SOFT_FACDIR that includes information to be sent on the handoff direction message.
  • the mobile station upon receiving the handoff direction message will include the target cells in the active set.
  • the mobile station will then send a handoff completion message on the reverse traffic channel to both anchor and target system(s).
  • the target system(s) receive the handoff completion from the MS, they can send a new message (SOFT_MobOnChannel) back to the anchor system to indicate the completion of the radio link towards the mobile.
  • a SOFT_FACREL message (not shown in Figure 3) can be used to indicate release of a soft handoff branch.
  • the SOFT_FACREL message includes the address of the corresponding branch.
  • the present invention is applicable to both real time (e.g., voice over IP/ ATM, multimedia conferencing, virtual reality) services and non-real time service (e.g., file transfer, Electronic mail etc.) when mobile wireless hosts (terminals) handoff from one system to another neighbouring system.
  • real time e.g., voice over IP/ ATM, multimedia conferencing, virtual reality
  • non-real time service e.g., file transfer, Electronic mail etc.
  • the real time nature of the traffic is determined by the quality of service specifications. If the traffic flow at handoff is of non-real time nature, best effort delivery could be use din routing the packets from the anchor system to the target system(s). This would be a possible default value in the QoS parameter.
  • the quality of service required to guarantee the delivery of service includes per- packet/cell delay maximum, and minimum values, offset delay.
  • the target system(s) would determine if they are able to commit to the quality of service currently guaranteed by the anchor system.
  • the invention has been described in detail with reference only to preferred embodiments, those skilled in the art will appreciate that various modifications can be made without departing from the invention.
  • the invention provides techniques for handing off between different access network technologies including W-LAN, bluetooth, x-DSL, GSM, etc.
  • W-LAN Wireless Local Area Network
  • bluetooth Wireless Local Area Network
  • x-DSL Wireless Local Area Network
  • GSM Global System for Mobile communications
  • the anchor system would locate a gateway within its own domain, or outside its domain, that would perform the necessary intersystem call control protocol conversion. Accordingly, the invention is defined only by the following claims which are intended to embrace all equivalents thereof.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

L'invention se rapporte à un support de transfert logiciel intersystème mettant en oeuvre, par exemple, un ensemble modifié de techniques de signalisation ANSI41, conjointement à un mécanisme de transport de données par paquets (par ex., TCP/IP ou ATM) pour le transfert des données entre systèmes. Un système d'ancrage établit le transfert logiciel en indiquant, entre autres choses, un ou plusieurs ensembles d'attributs du plan utilisateur disponibles pour réaliser l'interface entre le système d'ancrage et un(des) système(s) cible(s). Les niveaux de qualité de service sont également indiqués et peuvent être négociés entre systèmes.
EP99964853A 1998-12-18 1999-12-10 Procede et systeme de transfert logiciel intersysteme Withdrawn EP1142413A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US21511898A 1998-12-18 1998-12-18
US215118 1998-12-18
PCT/SE1999/002323 WO2000038465A1 (fr) 1998-12-18 1999-12-10 Procede et systeme de transfert logiciel intersysteme

Publications (1)

Publication Number Publication Date
EP1142413A1 true EP1142413A1 (fr) 2001-10-10

Family

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Application Number Title Priority Date Filing Date
EP99964853A Withdrawn EP1142413A1 (fr) 1998-12-18 1999-12-10 Procede et systeme de transfert logiciel intersysteme

Country Status (6)

Country Link
EP (1) EP1142413A1 (fr)
JP (1) JP2002534029A (fr)
AR (1) AR021911A1 (fr)
AU (1) AU3089400A (fr)
CA (1) CA2355042A1 (fr)
WO (1) WO2000038465A1 (fr)

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Also Published As

Publication number Publication date
CA2355042A1 (fr) 2000-06-29
WO2000038465A1 (fr) 2000-06-29
AR021911A1 (es) 2002-09-04
JP2002534029A (ja) 2002-10-08
AU3089400A (en) 2000-07-12

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