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WO2002015619A1 - Coordination d'affectations d'identificateurs de noeuds de reseau central dans un systeme de radio cellulaire - Google Patents

Coordination d'affectations d'identificateurs de noeuds de reseau central dans un systeme de radio cellulaire Download PDF

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Publication number
WO2002015619A1
WO2002015619A1 PCT/SE2001/001753 SE0101753W WO0215619A1 WO 2002015619 A1 WO2002015619 A1 WO 2002015619A1 SE 0101753 W SE0101753 W SE 0101753W WO 0215619 A1 WO0215619 A1 WO 0215619A1
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WO
WIPO (PCT)
Prior art keywords
core network
network node
nodes
pool
allocation plan
Prior art date
Application number
PCT/SE2001/001753
Other languages
English (en)
Inventor
Ake Arvidsson
Mikael Willgert
Haekan Niska
Kyösti TOIVANEN
Original Assignee
Telefonaktiebolaget Lm Ericsson (Publ)
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 (Publ) filed Critical Telefonaktiebolaget Lm Ericsson (Publ)
Priority to AU2001280396A priority Critical patent/AU2001280396A1/en
Publication of WO2002015619A1 publication Critical patent/WO2002015619A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/26—Network addressing or numbering for mobility support

Definitions

  • the present invention relates in general to the field of cellular radio communication and, in particular, to a method and means for co-ordinating allocations of identifiers in a cellular radio communication system.
  • a cellular radio communication system is normally divided into an access network and a core network.
  • the access network in GSM includes the Base Transceiver Stations (BTS) and control nodes such as the Base Station Controller (BSC) while the core network includes core network nodes such as the Mobile Switching Centre (MSC) , the Visiting Location Register (VLR) , the Home Location Register (HLR) and also Serving GPRS Support Nodes (SGSN) if General Packet Radio Service (GPRS) is included in the system.
  • BTS Base Transceiver Stations
  • BSC Base Station Controller
  • MSC Mobile Switching Centre
  • VLR Visit Location Register
  • HLR Home Location Register
  • SGSN Serving GPRS Support Nodes
  • the next generation cellular radio communication system i.e. the 3 rd generation, is called IMT 2000 by ITU (the International Telecommunication Union) and includes the Universal Mobile Telecommunications System (UMTS) .
  • the access network in UMTS includes the base transceiver stations (Node B) and control nodes such as the Radio Network Controller (RNC) while the core network includes the same types of nodes as the GSM system (as described above) .
  • Node B the base transceiver stations
  • RNC Radio Network Controller
  • each control node in the access network is connected to one MSC.
  • a proposed new type of architecture for a cellular radio communication system is to create a pool of core network nodes, e.g. a pool of MSC's and/or MSC/VLR's, that are connected to the access network, e.g. the control nodes, in the system.
  • This new architecture will provide effective load sharing between core network nodes, reduce inter MSC handovers, reduce inter MSC/VLR Location Updates and provide for an easy and smooth way to add (to increase capacity) or remove (for maintenance) MSC's or other core network nodes in the cellular system.
  • Core Network Node Identifiers CNNI
  • the core network node identifiers are used by the control nodes to identify the core network nodes in the pool.
  • the address to the identified core network node can then be found in a table or similar.
  • a sub-set of the available core network node identifiers will initially be allocated to each core network node in the pool according to a traffic allocation plan. During the operation of the system this traffic allocation plan might need to be changed, e.g. when a new MSC/VLR is taken into service or an old MSC/VLR is to be removed.
  • mapping means that the control nodes updates their "knowledge" about the CNNI ' s that are currently allocated to each MSC/VLR, i.e. which core network node identifiers that right now represent each known core network node in the system.
  • the , switch over time from an old mapping to a new mapping due to a new traffic allocation plan should be as short as possible to reduce the time window where adressing errors can occur.
  • MSC/VLRy assigns CNNIy to a Mobile Station but CNNIy identifies MSC/VLRx in the BSC mapping of CNNI's which means that the BSC's will address MSC/VLRx instead of MSC/VLRy.
  • a MSC/VLRx to MSC/VLRy reallocation of the Mobile Station will then occur and in the worst case the Mobile Station will "Ping-Pong" between different MSC/VLR's, i.e. several addressing errors in a row. This increases the signalling load on MSC/VLR's and HLR's in the system.
  • the procedure to define or change the addressing in a cellular radio communication system is performed by Operational and Maintenance procedures (O&M procedures) .
  • O&M procedures Operational and Maintenance procedures
  • each node in the cellular system i.e. MSC, BSC, RNC etc
  • O&M procedures that are used today are not standardised, which means that a number of O&M systems (from different suppliers) may be used in one and the same cellular system.
  • the address function e.g. the mapping of addresses, is to be changed with these O&M procedures a manual co-ordination and initiation must be performed, which opens up for mistakes not easily recognised in a system under operation.
  • MS Mobile Station
  • portable equipment intended for radio communication, like mobile stations, transceivers, pagers, electronic notebooks, laptops with integrated radios, communicators, tailored microchips connecting to radios or any other portable electronic equipment using a radio link as a mean of communication.
  • the present invention meets a problem related to a cellular radio communication system where a pool of core network nodes are arranged to serve at least one access network.
  • the problem is to perform a change of the allocation of core network node identifiers in the cellular radio communication system with a pool of core network nodes .
  • a primary object of the present invention is to provide a method and means for performing a change of the allocation of core network node identifiers in the cellular radio communication system with a pool of core network nodes .
  • Another object is to synchronously update the mapping of core network node identifiers in the access network nodes (to avoid any addressing errors) when the allocation of the core network node identifiers is changed.
  • the present invention provides a method for allocation of identifiers as claimed in claim 1
  • the present invention further provides a core network node, as claimed in claim 12, and an access network node, as claimed in claim 14, for utilising the method according to the present invention.
  • a system for utilising the method according to the present invention is characterised as it appears from the appended claim 15.
  • Embodiments of the present invention are characterised as it appears from the subclaims.
  • An advantage with the present invention is that one single core network node can control a change of the core network node identifier allocation in the system during operation.
  • core network nodes can automatically and independently of any manually operated O&M procedures allocate and re-distribute core network node identifiers .
  • control nodes can synchronously update their mappings of core network node identifiers to core network nodes.
  • a still further advantage is that only a small amount of signalling is needed between the core network and the access network during the change of the core network node identifier allocation.
  • Yet another advantage is that the risk of addressing errors between the access network and the core network due to an inaccurate mapping of core network node identifiers to core network nodes is small.
  • Still another advantage is that if an operator controlled O&M procedure is required to control the identifier allocation and mapping, only one type of core network nodes needs to be arranged with this O&M procedure.
  • Figure 1 is illustrating a view of a known GSM system.
  • Figure 2a is illustrating a view of a first cellular radio communication system with a pool of core network nodes .
  • Figure 2b is illustrating a view of a second cellular radio communication system with a pool of core network nodes .
  • Figure 3 is illustrating a flow chart of a first embodiment of the method according to the present invention.
  • Figure 4 is illustrating a flow chart of a second embodiment of the method according to the present invention.
  • Figure 5a is illustrating a simplified block diagram of a core network node according to the present invention.
  • Figure 5b is illustrating a simplified block diagram of a control node according to the present invention.
  • the present invention relates to a method and means for coordination of the allocation of core network nodes identifiers in a cellular radio communication system where a pool of core network nodes are arranged to serve at least one access network.
  • FIG. 1 illustrates a simplified view of a known GSM system 100.
  • the GSM system 100 includes four Base Transceiver Stations (BTS) 101-104, which are serving one cell 105-108 each.
  • BTS 101 and 102 are connected to a first Base Station Controller (BSC) 109, i.e. a first control node, and BTS 103 and 104 are connected to a second Base Station Controller (BSC) 110, i.e. a second control node.
  • BSC Base Station Controller
  • the first BSC is connected to a first Mobile Switching Centre/Visiting Location Register (MSC/VLR) 111 and the second BSC 110 is connected to a second Mobile Switching Centre/Visiting Location Register (MSC/VLR) 112.
  • MSC/VLR Mobile Switching Centre/Visiting Location Register
  • MSC/VLR Mobile Switching Centre/Visiting Location Register
  • Cell 105 and 106 cover the MSC Service Area 116 of MSC/VLR 111 and cell 107 and 108 cover the MSC Service Area 117 of MSC/VLR 112. Both MSC/VLR 111 are 112 are connected to a Home Location Register (HLR) 113.
  • the BTS 101-104 and BSC 109-110 are access network nodes and part of the access network 114 and the MSC/VLR 111-112 and HLR 113 are core network nodes and part of the core network 115.
  • a Mobile Station (MS) 118 is also illustrated in cell 106.
  • FIG. 2a illustrates a simplified view of an example of a cellular radio communication system 200 with a pool 201 of core network nodes connected to an access network 202.
  • the pool of core network nodes 201 includes three MSC/VLR's 203- 205 (that belongs to the core network).
  • the three MSC/VLR's in the pool 201 are connected to five control nodes (Ctrl nodes) 206-210 in the access network 202.
  • the control nodes 206-210 can, as an example, be Base Station Controllers in a GSM-system or Radio Network Controllers in an UMTS-system.
  • Other parts of the access system 202 e.g.
  • connection 211 between the MSC/VLR's 203-205 and the control nodes 206-210 may be arranged by circuit connections as illustrated in figure 2a or by a packet network 112, e.g. an IP network, as illustrated in figure 2b. All control nodes 206-210 in the access network 202 can access any one of the MSC/VLR's 203-205 in the pool 201.
  • core network node identifiers can be used by the control nodes to identify the core network nodes in the pool.
  • the Temporary Mobile Subscriber Identity (TMSI) is one example of a mechanism that can be used as such a core network node identifier in an addressing function between core network nodes and access network nodes. All the available TMSI identifiers in the system form a TMSI range. This range is divided into sub-ranges so that each core network node, e.g. the MSC/VLR 203-205 in figures 2a, can be allocated one sub-range each. These sub-ranges do not need to be TMSI identifiers in consecutive order. They can be selected in any possible way.
  • each TMSI identifier is only present in one of these sub-ranges to avoid any double allocation.
  • a Mobile Station is attached to the system or moved into the geographical area that is served by the pool it is assigned one TMSI identifier which, among other things, is used to identify the MSC/VLR in the pool of MSC/VLR's that is going to serve the Mobile Station.
  • the control nodes can then easily find the right core network node address when they have identified the serving MSC/VLR via the TMSI identifier.
  • FIG. 3 illustrates a flow chart of a first embodiment of the method according to the present invention.
  • the method is applied in the system that is illustrated in figure 2a with the pool 201 of MSC/VLR's.
  • MSC/VLR 203-204 are serving traffic and MSC/VLR 205 is added to the pool to increase capacity in the system.
  • the TMSI is used as the core network node identifier in the addressing function by letting a first part of the TMSI identifier represent a core network node identity number.
  • the TMSI identifiers are mapped into actual core network node addresses, in this case MSC/VLR addresses, in the control nodes. Hence, the TMSI identifier is used to find the right address to the core network node e.g.
  • MSC/VLR 203 has been allocated TMSI identifier number kl-k30
  • MSC/VLR 204 has been allocated TMSI identifier number k31-k60
  • MSC/VLR has not been allocated any TMSI identifiers yet (the TMSI identifiers in system 200 are as an example numbered between kl-k60) .
  • the new MSC/VLR 205 wants to allocate a number of TMSI identifiers to be able to serve traffic in the system 200. In this embodiment only one type of core network nodes, i.e.
  • the MSC/VLR 203-205 is handling and coordinating the change of the core network node identifier allocations and only one of these core network nodes is initiating the switch from one allocation of core network node identifiers to another allocation of core network node identifiers, i.e. to change the current traffic allocation plan.
  • the MSC/VLR 205 initiates a change of the first traffic allocation plan to enable the introduction of a new (second) traffic allocation plan in which the MSC/VLR 205 is included.
  • This initiation can, as an example be a part of a plug-and-play action which means that the MSC/VLR 205 automatically transmits a "traffic allocation plan change" message to MSC/VLR 203 and 204 (i.e. the other MSC/VLR's in the pool) when it is "plugged" into the system.
  • the MSC/VLR's 203-205 in the pool create together the new traffic allocation plan with a new distribution of the TMSI identifiers between the MSC/VLR's in the pool.
  • MSC/VLR 205 will get TMSI identifier number k21-k30 from MSC/VLR 203 and number k51-k60 from MSC/VLR 204.
  • the TMSI identifier number k21-k30 and number k51-k60 forms a set of core network node identifiers that is going to refer to MSC/VLR 205 when the new traffic allocation plan is in operation.
  • the current (first) traffic allocation plan is still used during this step so that there is no disturbance on the traffic.
  • the creation of the new traffic allocation plan is started automatically by the new MSC/VLR 205 by requesting (in a message) its share of the available TMSI range, with regard to its traffic capacity or a given allocation value, from the other MSC/VLR's. If e.g. all MSC/VLR's have the same traffic capacity, MSC/VLR 205 transmits the message to MSC/VLR 203,
  • MSC/VLR from the operator or programmed into the MSC/VLR
  • the creation of the new traffic allocation plan can also be performed by a negotiation procedure between the MSC/VLR's in the pool, i.e. the MSC/VLR 205 asks for a specific number of TMSI identifiers and the MSC/VLR's 203-204 either accepts that or suggests another number of TMSI identifiers which is then accepted by the MSC/VLR 205. This means that messages are transmitted between the MSC/VLR's in the pool during the negotiation procedure.
  • the MSC/VLR 203 and 204 invalidate the TMSI identifiers that are to be allocated to the
  • MSC/VLR 205 i.e. moved from MSC/VLR 203 and MSC/VLR 204 to MSC/VLR 205.
  • the MSC/VLR 203 and 204 assign new TMSI identifiers, that are allocated to the respective MSC/VLR according to the first traffic allocation plan but not one of the invalidated TMSI identifiers, to Mobile Stations with invalidated TMSI identifiers.
  • These newly assigned TMSI identifiers are also allocated to MSC/VLR 203 and 204 in the second traffic allocation plan. It is the serving MSC/VLR that makes the assignment of new TMSI for these Mobile stations.
  • the MSC/VLR's continue with step 304 during a specific time period to allow all attached Mobile Stations with invalidated TMSI identifiers to get a new non-invalidated TMSI identifier.
  • the specific time period can, as an example, be somewhat larger than the time for a Periodic Location Update.
  • Periodic Location Update refers to the requirement that the Mobile Station, when in normal service, automatically and regularly contacts the network.
  • the time period for Periodic Location Update is defined by the system and is in the range of 6 minutes to slightly more than 24 hours (normally around 30 minutes) .
  • the MSC/VLR 205 (i.e. the MSC/VLR that initiated the change of the first traffic allocation plan in step 301) activates the new second traffic allocation plan in the system 200 by transmitting its new TMSI identifier range, i.e. number k21-k30 and k51-k60, to all the control nodes 206-210 in the access network 202.
  • MSC/VLR 205 co-ordinates the change of the traffic allocation plan in the system, i.e. the change of core network node identifier allocation.
  • the control nodes 206-210 immediately (and simultaneously) update their TMSI mapping of identifiers, i.e. information about which TMSI identifiers that are allocated to each MSC/VLR, according to the new second traffic allocation plan.
  • the control nodes 206-210 recognise that MSC/VLR 205 has been assigned some of the TMSI identifiers in the TMSI range and therefore automatically adjust the mapping of TMSI ' s to MSC/VLR 203, 204 respectively and add a mapping of TMSI's for MSC/VLR 205, i.e.
  • the MSC/VLR's can by utilising this method automatically perform a new allocation of the available TMSI identifiers
  • This also facilitates a consistent mapping of TMSI identifiers to MSC/VLR's by the access network nodes.
  • the switch over time from an old mapping to a new mapping is very short which reduces the time window where a "wrong" identification can be made.
  • the MSC/VLR 205 can as an alternative in step 305 activate the new second traffic allocation plan by transmitting both its own TMSI range and the TMSI range for the other MSC/VLR's 203, 204 respectively to the control nodes 206- 210.
  • the control nodes 206-210 can update their TMSI mapping of identifiers to all MSC/VLR's in step 306 without adding and/or deleting certain identifiers in the respective TMSI mapping.
  • This alternative requires that also the addresses to the "other" MSC/VLR's (i.e. 203 and 204) are transmitted from the MSC/VLR 205 to the control nodes, e.g. together with the new TMSI ranges.
  • Figure 4 illustrates a flow chart of a second embodiment of the method according to the present invention.
  • the method is applied in the system that is illustrated in figure 2a with the pool 201 of MSC/VLR's.
  • the same preconditions apply as when the first embodiment above started except that a core network node identifier O&M procedure is arranged in the MSC/VLR's in the pool.
  • O&M procedure the operator can specify a TMSI sub-range for MSC/VLR 205.
  • the core network node identifier O&M procedure initiates a change of the first traffic allocation plan and instructs the MSC/VLR 205 to allocate TMSI identifier k21-k30 and k51-k60 to it in the new (second) traffic allocation plan.
  • the core network node identifier O&M procedure can also, as an option, give a specified "wait time" to MSC/VLR 205.
  • the MSC/VLR 205 transmits a message to the MSC/VLR 203 and 204 to invalidate TMSI identifiers number k21-k30 and k51-k60.
  • the MSC/VLR 203 invalidates TMSI identifiers number k21-k30 and MSC/VLR 204 invalidates TMSI identifiers number k51-k60, i.e. those TMSI identifiers that are to be allocated to MSC/VLR 205.
  • the MSC/VLR 203 and 204 assigns new TMSI identifiers, that are allocated to the respective MSC/VLR 203 and 204 according to the first traffic allocation plan but not one of the invalidated TMSI identifiers, to Mobile Stations with invalidated TMSI identifier. These newly assigned TMSI identifiers are also allocated to MSC/VLR 203 and 204 in the second traffic allocation plan. It is the serving MSC/VLR that makes the assignment of these new TMSI for these Mobile stations.
  • the MSC/VLR's continue with step 404 during a specific time period as in step 304 in the first embodiment or according to the waiting time that was (optionally) defined by the core network node identifier O&M procedure in step 401 above .
  • Step 405 activating the new traffic allocation plan
  • step 406 updating the mapping of identifiers in the control nodes
  • FIG. 5a illustrates a simplified block diagram of an example of a core network node 501 for utilising the inventive method.
  • the core network node 501 includes a "CNNI range co-ordinator unit" 503 connected to a "CNNI verifier unit” 504 (CNNI is an abbreviation of Core Network Node Identifier) .
  • the core network node 501 also includes the usual known units and functions of a known core network node but those are not illustrated or described here for simplicity.
  • the CNNI range co-ordinator unit 503 is, among other things, responsible for co-ordination of the core network nodes own part of a CNNI range, e.g. the TMSI range, in the pool or pools that it belongs to (one core network node can be part of more than one pool) .
  • the CNNI range co-ordinator 503 informs the control nodes about a change of traffic allocation plan, starts the negotiation between the core network nodes about a new allocation of identifiers or informs the other core network nodes that it is going to take over some identifiers from them if the core network node 501 initiates the change of the traffic allocation plan. This is started with a signal through an interface 507 in the CNNI range co-ordinator unit 503.
  • the co- ordinator unit is also responsible for updating the CNNI verifier unit 504 with the actual CNNI ranges in use for the pool(s).
  • the co-ordinator unit 503 is connected to other pool members via interface 508 and to control nodes via interface 509. It updates the CNNI verifier 504 with new CNNI ranges through interface 510.
  • the CNNI verifier unit 504 is, among other things, responsible for keeping a record of the CNNI range or ranges that are allocated to the core network node 501 and also responsible for supplying other parts/units of this node, if required, with information about valid CNNI's
  • the CNNI verifier 504 is also responsible for supporting connection controller (s) in the core network node 501 with verification of CNNI's, i.e. is a used CNNI valid or does it needs to be changed (e.g. due to an invalidation) .
  • the CNNI verifier unit 504 is connected to the connection controller (s) (not illustrated) via interface 511.
  • FIG. 5b illustrates a simplified block diagram of an example of a control node 502 for utilising the inventive method.
  • the control node 502 includes a "CNNI range coordinator unit” 505 connected to a "CNNI to CNNA translator unit” 506 (CNNA is an abbreviation of Core Network Node Address) .
  • the control node 502 also includes the usual known units and functions of a known control node but those are not illustrated or described here for simplicity.
  • the CNNI range co-ordinator unit 505 is among other things responsible for receiving a CNNI range (e.g. the TMSI range) from a core network node and for creating or updating a "translation table" for the received CNNI range and the address (CNNA) to this core network node, i.e. the mapping of CNNI's, so that the CNNI's in the received CNNI range only refer to this core network node.
  • the core network node address (CNNA) is then directly usable by connection controller (s) in the control node 502. It is also responsible for updating the CNNI to CNNA translator unit 506 (via interface 513) with new translation tables (e.g. after a change of a traffic allocation plan) .
  • the coordinator unit 505 is connected to core network nodes in the pool via interface 512 and to the CNNI range coordinator unit 505 via interface 513.
  • the CNNI to CNNA translator unit 506 is, among other things, responsible for maintaining a translation mechanism to translate one CNNI to one CNNA for the control node 502 (i.e. to get the actual address with the help of a CNNI) and to support connection controller (s) in the control node 502 with translations of CNNI's to CNNA's.
  • the translator unit 506 is connected to the connection controller (s) (not illustrated) in the control node via interface 514.
  • the above disclosed inventive method and means facilitates that only one type of core network node in the pool, e.g. MSC's or MSC/VLR's, is handling the core network node identifier allocation; that only one of these core network nodes is activating the switch from an old to a new traffic allocation plan; and that the control nodes can (by them selves) simultaneously adjust their mapping of core network node identifier to all core network nodes in the pool (on the basis of one given sub-range of core network node identifiers) .
  • the core network nodes in the pool may be of different types e.g. a mixture of GSM, UMTS and GSM/UMTS MSC/VLR's.
  • the inventive method may be arranged to "override" all installed O&M procedures in the system or to be controlled by a specific core network node identifier O&M procedure.
  • the invention can be completely or partially implemented as software in at least one microprocessor.

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

Abstract

L'invention concerne des procédés et des moyens permettant de coordonner des affectations d'identificateurs de noeuds de réseau central dans un système de radio cellulaire. Un premier centre de commutation des services mobiles (MSC)/registre de localisation des visiteurs (VLR) d'un groupe de MSC/VLR active (305) un commutateur afin de passer d'un ancien plan d'affectation de trafic à un nouveau plan d'affectation de trafic par transmission d'un message à tous les noeuds de commande du réseau d'accès. Ce message comprend un sous-ensemble d'identificateurs affectés au premier MSC/VLR. Les noeuds de commande mettent simultanément à jour (306) les mises en correspondance des identificateurs avec tous les noeuds de réseau central du groupe sur la base d'un sous-ensemble d'identificateurs de noeuds du réseau central contenu dans ledit message.
PCT/SE2001/001753 2000-08-16 2001-08-14 Coordination d'affectations d'identificateurs de noeuds de reseau central dans un systeme de radio cellulaire WO2002015619A1 (fr)

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SE0002947-0 2000-08-16
SE0002947A SE516780C2 (sv) 2000-08-16 2000-08-16 Allokeringskoordinering av kärnnätsnodidentifierare i cellulärt radiokommunikationssystem.

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Cited By (2)

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Publication number Priority date Publication date Assignee Title
WO2004010722A1 (fr) * 2002-07-22 2004-01-29 Telefonaktiebolaget L M Ericsson (Publ) Entite de controle d'acces
CN100342740C (zh) * 2004-05-06 2007-10-10 日本电气株式会社 数据传输系统和数据传输方法

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GB2251532A (en) * 1990-11-16 1992-07-08 Toshiba Kk Allocating identifiers in a local area network
WO1999004511A2 (fr) * 1997-07-21 1999-01-28 Northern Telecom Limited Affectation du trafic et equilibrage dynamique de la charge dans un systeme cellulaire
WO2000060895A1 (fr) * 1999-04-06 2000-10-12 Telefonaktiebolaget Lm Ericsson (Publ) Mecanisme generique de transfert intersysteme
WO2001003454A1 (fr) * 1999-06-30 2001-01-11 Nokia Corporation Gestion de services

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GB2251532A (en) * 1990-11-16 1992-07-08 Toshiba Kk Allocating identifiers in a local area network
WO1999004511A2 (fr) * 1997-07-21 1999-01-28 Northern Telecom Limited Affectation du trafic et equilibrage dynamique de la charge dans un systeme cellulaire
WO2000060895A1 (fr) * 1999-04-06 2000-10-12 Telefonaktiebolaget Lm Ericsson (Publ) Mecanisme generique de transfert intersysteme
WO2001003454A1 (fr) * 1999-06-30 2001-01-11 Nokia Corporation Gestion de services

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SCHEIDER A. ET AL.: "Gran - a new concept for wireless access in UMTS", ISS '97. WORLD TELECOMMUNICATIONS CONGRESS. (INTERNATIONAL SWITCHING SYMPOSIUM), GOLOBAL NETWORK EVOLUTION: CONVERGENCE OR COLLISION?, vol. 2, 21 September 1997 (1997-09-21) - 26 September 1997 (1997-09-26), TORONTO *

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004010722A1 (fr) * 2002-07-22 2004-01-29 Telefonaktiebolaget L M Ericsson (Publ) Entite de controle d'acces
CN100342740C (zh) * 2004-05-06 2007-10-10 日本电气株式会社 数据传输系统和数据传输方法

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AU2001280396A1 (en) 2002-02-25
SE0002947D0 (sv) 2000-08-16
SE516780C2 (sv) 2002-03-05

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