EP1188340A2 - Procede de transfert de stations mobiles dans un reseau de radiotelecommunication a service de radio paquet general (gprs) - Google Patents

Procede de transfert de stations mobiles dans un reseau de radiotelecommunication a service de radio paquet general (gprs)

Info

Publication number
EP1188340A2
EP1188340A2 EP00944541A EP00944541A EP1188340A2 EP 1188340 A2 EP1188340 A2 EP 1188340A2 EP 00944541 A EP00944541 A EP 00944541A EP 00944541 A EP00944541 A EP 00944541A EP 1188340 A2 EP1188340 A2 EP 1188340A2
Authority
EP
European Patent Office
Prior art keywords
sgsn
mobile station
new
cell
gprs
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Withdrawn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
EP00944541A
Other languages
German (de)
English (en)
Inventor
Francis Lupien
Marlene Yared
Jean-François BETRAND
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 EP1188340A2 publication Critical patent/EP1188340A2/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Withdrawn legal-status Critical Current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
    • H04W36/12—Reselecting a serving backbone network switching or routing node
    • 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
    • H04W36/0072—Transmission or use of information for re-establishing the radio link of resource information of target access point

Definitions

  • FIG. 1 A first figure.
  • This invention relates to telecommunication systems and, more particularly, to a system and method of handing over mobile stations in a General Packet Radio Service (GPRS) radio telecommunications network to support voice services.
  • GPRS General Packet Radio Service
  • a cell change or handover procedure in GPRS is executed when a Mobile Station (MS), which is transmitting and receiving user data payload while in GPRS mobility management (GMM) state READY, roams into the coverage area of a neighboring cell, acquires service in that cell, and resumes data transmission.
  • MS Mobile Station
  • GMM mobility management
  • the network tracks mobility information by updating the MS's serving routing area (RA) and cell.
  • RA serving routing area
  • the process of updating cell information and routing area information is executed through standards defined by GMM procedures.
  • Inter-SGSN routing area update 3
  • Delay in the real time traffic flow is common to all types of cell change. Interruptions arise due to the execution of various functions currently prescribed in the GPRS standard for radio access, radio resource allocation, location update network signaling, and inter-SGSN link handling.
  • a new TBF resource must be used to send the Routing Area Update Request message.
  • the estimated time to establish a new uplink TBF and send the Routing Area Update Request Message is 100- 150 ms.
  • the mobile After the Routing Area Update Complete Message is sent, the mobile must then reestablish an uplink TBF (100-150 ms) and a downlink TBF (60-100 ms) to resume data transfer.
  • the current mobility management procedures are designed to minimize packet loss while a MS performs a cell change within and across SGSN borders, and hence are biased towards loss-sensitive traffic types.
  • Loss minimization is achieved by minimizing the loss of Logical Link Control (LLC) packets during the change of traffic flow connections between the old and new SGSN, and is accomplished through a buffer transfer and associated synchronization of LLC transmission states. The content of the old SGSN buffer is transferred to the new SGSN, including packets that were not acknowledged and packets received at the old SGSN before the transfer of control to the new SGSN was completed.
  • LLC Logical Link Control
  • PDP Packet Data Protocol
  • PS packet-switched
  • HLR Home Location Register
  • GTP GPRS Tunneling Protocol
  • the mobility management context must be updated in the circuit-switched (CS) domain. Assuming that each network signaling procedure may have a delay budget of 100-200 ms, this yields an additional 1.1 to 2.2 seconds delay. Furthermore, approximately 50 ms is needed for the SGSN to process the RA Update Request and send the RA Update Accept.
  • inter-SGSN cell change yields the longest interruption time.
  • the total interruption time for an inter-SGSN routing area update is approximately 3-4 seconds.
  • FIG. 1 is a simplified block diagram illustrating the existing GPRS system.
  • a packet data network (PDN) 1 having terminal equipment (TE) 1 a is connected to the network through a gateway GPRS support node (GGSN) 2.
  • a mobile station (MS) 12 is connected to the network through a serving (Old) base station system (BSS-1) 10 and a serving GPRS support node (SGSN-1) 6.
  • the BSS-1 also connects the MS to a serving (Old) mobile switching center/visitor location register (MSC/NLR-1) 8.
  • the SGS ⁇ - 1 is also connected to a home location register (HLR) 5, an equipment identity register (EIR) 3, and to a target (New) SGSN (SGSN-2) 7.
  • HLR home location register
  • EIR equipment identity register
  • SGSN-2 is, in turn, connected to a New BSS (BSS-2) 11 and a New MSC/VLR (MSC/VLR-2) 9.
  • BSS New BSS
  • MSC/VLR-2) New MSC/VLR
  • PLMN Public Land Mobile Networks
  • FIG. 2 is a message flow diagram illustrating the messages utilized in the existing inter-SGSN handover process. As shown in FIG. 2, the delay problem can be broken down into the following areas: 1 ) Cell re-selection procedures;
  • Delay inducing problem areas within GPRS can be broadly categorized into two distinct types - MS Centric relating to mobile station related delays, and Network
  • Mobile station delays are related to the air link protocol and air interface delays such as those resulting from cell re-selection procedures and in the establishment of the Uplink and Downlink TBF.
  • the air link includes delays from the physical RF link layer, the physical data link layer (sub- channeling (PBCCH, PACCH, PDCH, PCCCH, etc.)) and the Media Access Control/Radio Link Control (MAC/RLC).
  • PBCCH physical RF link layer
  • PACCH Physical data link layer
  • PDCH Physical Code Division Multiple Access Control
  • PCCCH Physical Control/Radio Link Control
  • Specific core network delays exist in GTP Link establishment procedures, policing functions, and admission control.
  • MS Cell Re-selection The MS Cell Re-selection Procedure is described in the GSM specifications 04.60 and 05.08. The MS Cell Re-selection Procedure is controlled by the parameter Network_Control_Order. It is sent on the Broadcast Control Channel (BCCH) as well as on the common control or Packet Associated
  • BCCH Broadcast Control Channel
  • PACCH Control Channels
  • NC0 MS control autonomous cell re-selection
  • NCI MS control with measurement reports sent to the network
  • NC2 Network control with measurement reports sent to the network NC2 Network control with measurement reports sent to the network.
  • an MS While in packet transfer mode, an MS constantly measures the signal strength of its neighboring cells and of the serving cell. Once it has determined the best candidate target cell, based on signal strength measurements, the MS then acquires the target cell's system access information. The MS may continue its operation in packet idle or packet transfer mode in the old serving cell, while acquiring certain system information for the target cell. The MS may suspend its TBF in order to read the necessary information message on the BCCH and Packet Broadcast Control Channel (PBCCH) of the target cell.
  • PBCCH Packet Broadcast Control Channel
  • the MS may move to the target cell without having completely read all of the necessary system information messages. This may be due to its multi-slot capabilities or that (according to GSM 05.08) the current serving cell radio conditions are no longer fulfilled.
  • the MS starts to receive information on the PBCCH of the target cell (if the target cell contains a PBCCH);
  • the MS has received SI- 13 on the BCCH of the target cell indicating that the cell supports GPRS (if there is no PBCCH in the target cell);
  • the MS delays the start of receiving information on the PBCCH until the first occurrence of PSI-1 in block B0. If reception of PS-1 and PS-2 fails, the MS can continue in the old cell until the next occurrence of PSI-1 in block B0. The mobile does not perform packet access in the target cell or enter the packet transfer mode until it has performed a "complete acquisition" of the PBCCH messages. In this case, the MS first acquires a PSI-1 message (20 ms), then acquires a consistent set of PSI-2 messages (min 1 msg., max
  • the scheduling of the packet system information messages on the PBCCH is completely network-determined.
  • the network divides the messages into high repetition rate and low repetition rate messages, and can use a repetition cycle that is anywhere from 1 to 16.
  • the repetition cycle is 16
  • the cycle is set to 8 (as in the BCCH case) and the messages are scheduled so that the complete set is read in one cycle, the time to read is still almost 2 seconds.
  • TBF temporary block flow
  • the GPRS specifications state that the current TBF must be abandoned and a new TBF requested if there is a change in priority.
  • Mobility management messages such as the Routing Area (RA) Update message, have a higher priority than user data. Therefore, before the RA Update sequence, a TBF must be established, and after the procedure is finished, a new TBF must be established to resume the data flow. -7-
  • the current GPRS baseline text defines a procedure for combined inter-SGSN RA/LA updates which is not appropriate to support realtime service performance requirements.
  • the data stream is interrupted from the time the MS leaves the serving cell until the RA Update terminates with the RA Update complete signal.
  • Location update handling includes the following:
  • the RA Update procedure assumes the following functions are performed following either an MS-controlled or network-controlled (i.e., Base Station System (BSS)) cell re-selection: 1) GTP Link Establishment
  • packet delays in mobile terminated calls may range between 410 ms and 660 ms for packets arriving during the RA Update procedure. Packets arriving later will suffer delays of 260 ms to 450 ms due to the priority transmission of packets accumulated during the RA Update interruption and the Upd PDP context procedure.
  • the total packet delay may be in the range of 550 ms to 910 ms, of which 100 ms to 200 ms is attributable to the GTP link establishment procedure.
  • packet delays in mobile terminated calls may range between 310 ms and 460 ms for packets arriving during the RA Update procedure. Packets incoming to the new SGSN from the GGSN after the RA Update procedure are buffered and await transmission due to the priority transmission of packets already accumulated. The delay may be quantified as 170 ms to 250 ms. -8-
  • the total packet delay may be in the range of 450 ms to 660 ms.
  • the delay is due to buffering at the old SGSN until the inter-SGSN tunneling link is established (200 ms to 400 ms) and buffering which may occur at the TE in order to minimize packet loss during preemption/interruption of packets transferred at the RA Update (250 ms to 360 ms).
  • MS authentication request (the security triplet(s) may need to be obtained from the HLR) ;
  • New location update from the new SGSN to the associated MSC/VLR • New location update from the new SGSN to the associated MSC/VLR; New MSC/VLR Location update to the HLR;
  • the total interruption time may total three to four seconds. -9-
  • Policing Functions In systems that only support best efforts (loss sensitive) services, the associated policing functions (if present at all) do not provide the characteristics needed for real-time payload services. Current policing functions are, at best, based on simple traffic shaping mechanisms for best effort traffic only. The shaping is meant to forge a "bursty" data stream into a desired traffic profile.
  • policing function consists of identifying packets that fall out of profile parameters, typically when the packet rate exceeds the profile rate limit.
  • Traffic shaping functions are typically implemented in edge nodes. If the radio access network, the operator network, and the ISP network are considered separate domains, then the SGSN, GGSN, and RNS/RNC can be edge nodes. In the scope of GPRS Ph. 1 , the SNDCP/LLC implements such functions.
  • the present invention is a method of improving cell change procedures within the GPRS system to reduce the handover interruption time while keeping the delays to affordable values for real-time payload services in a PS GPRS network.
  • the method consists of procedural mechanisms which reduce the data stream interruption at the air interface RLC/MAC level and shorten the inter-SGSN Routing Area Update interruption interval at the core network level.
  • Improvements at the air interface are achieved by reducing the system information retrieval time and pre-allocating the TBF prior to the MS accessing the new cell/BSS.
  • the system information retrieval time is reduced by sending system information messages about the target cell for handover on a control channel in the MS's current serving cell.
  • a Packet Associated Control Channel (PACCH) may be utilized as the control channel for sending such system information messages.
  • PACCH Packet Associated Control Channel
  • silent periods when no speech is in progress, are utilized for sending system information messages.
  • system information messages are sent on a different time slot than the time slot carrying the speech.
  • Pre-allocation of the TBF is accomplished by reserving a TBF in the target cell for the MS prior requesting a handover.
  • Reserving a TBF in the target cell for the MS prior to requesting handover may also include the following: reserving resources in the target cell for the MS based on the MS's quality of service profile; modifying a Packet Cell Change Order message to assign the TBF in the target cell to the MS; and or modifying a Packet Time Slot Reconfigure message to assign the TBF in the target cell to the MS.
  • Improvements within the core network are achieved by utilizing low latency delay-sensitive requirements and shaping packet traffic for premium traffic (e.g., speech).
  • Low latency delay-sensitive requirements instead of loss- sensitive requirements, provides a more efficient approach to packet dropping, redirection, and buffering.
  • a combination of procedural mechanisms is utilized to improve traffic shaping.
  • the GTP link establishment procedure is improved by modifying the GTP link handling logic so that mobility management procedures are delayed until after handover. Location update procedures and security functions are -11- postponed until after the handover is completed.
  • the current inter-SGSN tunneling mechanism may also be removed.
  • packet multicasting or "soft handover"- like mechanisms, between the GGSN and the serving and target SGSN are utilized to improve handover performance.
  • FIG. 1 (Prior Art) is a simplified block diagram illustrating the existing GPRS system
  • FIG. 2 (Prior Art) is a message flow diagram illustrating the messages utilized in the existing inter-SGSN handover process
  • FIG. 3 is a simplified functional block diagram illustrating the traffic shaping function for delay-sensitive and loss-sensitive traffic requirements
  • FIG. 4 is a message flow diagram illustrating the messages utilized in an improved method of MS-controlled cell change
  • FIG. 5 is a message flow diagram illustrating the messages utilized in a first embodiment of an improved method of Network-controlled cell change
  • FIG. 6 is a message flow diagram illustrating the messages utilized in a second embodiment of an improved method of Network-controlled cell change
  • FIG. 7 is a message flow diagram illustrating the messages utilized in a third embodiment of an improved method of Network-controlled cell change.
  • the preferred embodiment of the present invention is derived from the implementation of a plurality of optimization procedures to reduce the handover interruption time. It is, therefore, necessary to discuss the possible optimization solutions to delay-inducing problem areas within GPRS prior to describing the preferred embodiment of the present invention.
  • MS Cell Re-Selection improves the MS Cell Re- -12- selection Procedure by sending PSI-1 and PSI-2 information, or SI- 13 and any other system information messages about the target cell, on the old serving cell's common control channel or Packet Associated Control Channel (PACCH). This procedure reduces the cell re-selection time and the loss of downlink radio blocks on the serving cell.
  • PSI-1 and PSI-2 information or SI- 13 and any other system information messages about the target cell, on the old serving cell's common control channel or Packet Associated Control Channel (PACCH).
  • PACCH Packet Associated Control Channel
  • the maximum amount of system information messages sent on the BCCH is ten (10). Each message takes approximately 20 ms to transmit. Therefore, it requires a utilization of the PACCH for a maximum total of 200 ms to transfer all of the system information messages. These do not have to be sent all at once, but can be multiplexed within a 5-second period (the cell re-selection period).
  • the amount of packet system information messages sent on the PBCCH ranges from 4 to 28. Each message takes approximately 20 ms to transmit. Therefore, it requires a utilization of the PACCH for a total of 80-560 ms to transfer all of the system information messages. These do not have to be sent all at once, but can be multiplexed within the 5-second cell re-selection period.
  • the present invention may also send the messages in such a way as to minimize the disruption to the speech or other real-time payload. For example, messages may be sent during silent periods or on another time slot if the mobile station's multi-slot capabilities permit.
  • the effect of sending PSI-1 and PSI-2 information, or SI- 13 and any other system information messages about the target cell, on the old serving cell's common control channel or PACCH is that the system information retrieval time on the target cell is reduced to zero if a change in the broadcast channel information has not occurred from the time the terminal received the SI messages on the old serving cell until it resynchronizes on the new cell. The time for the cell change therefore is reduced to only the resynchronization time.
  • the serving BSS/RNC has to obtain the information from the target cell's BSS/RNC either directly or via their respective SGSNs.
  • the network selects the target cell based on the information sent by the MS in the measurement reports.
  • the MS determines the target cell. However, the MS can then request the target cell's system information from the network.
  • the network may pre-reserve the TBF in the target cell so that the serving cell can forward the necessary information to the mobile station.
  • two RLC/MAC control messages are modified and used by the network in a handover situation to assign a TBF to a mobile station.
  • the existing MAC control messages i.e., Packet Cell Change Order and Packet Time Slot Reconfigure
  • a new message can be created.
  • the Packet Cell Change Order message is used to order the MS to another cell. It contains information elements necessary to identify the BCCH of the target cell (/. e. , BSIC + BCCH frequency). It does not contain the information elements required for frequency hopping, and it does not contain any reference to a specific packet data traffic channel in the target cell.
  • the Packet Time Slot Reconfigure message is used to reassign the mobile to another packet data channel within the same cell. It contains frequency and time slot information for the target packet data channel as well as the TBI to be used in the uplink and/or downlink. The message is designed to offload the mobile station to another packet resource within the same cell and therefore does not include any
  • the present invention creates a combination of the above two messages. Either one maybe modified to include the required information elements or a completely new message may be created.
  • the time for this transaction is estimated as: • receive "Cell Change / TS Reconfigure" order - 20 ms
  • this procedure reduces the TBF set up time from the current 60- 150 ms down to 50 ms.
  • a form of resource -14- reservation must be used. This has the added benefit of guaranteeing resources in the target cell.
  • Resource reservation based on the mobile station's Quality of Service (QoS) profile can also be used.
  • QoS Quality of Service
  • Naturally inter-BSS/RNC communications are necessary for this implementation. The communications can be between the BSS/RNCs directly or via their respective SGSNs.
  • This concept is easily supported in a network-controlled cell re-selection mode since the target cell is selected by the network based on the measurement reports sent in by the mobile station.
  • the concept can also be supported in a MS-controlled cell re-selection mode, but it is a little more complex. In this case, the mobile station selects a target cell and requests the network to reserve resources for it.
  • any mobility management or signaling procedure causes the release of the TBF used for real-time payloads (e.g., speech). Possible modifications to the specifications could include assigning the same or higher priority to signaling traffic that is used for real-time traffic.
  • the performance of mobility management procedures may be delayed until after the handover process is completed so as to reduce the interruption time.
  • the start of the mobility management procedure may be controlled by a timer which specifies the time interval between the two events.
  • the procedure for of delaying the mobility management procedure until after the call completion is discussed later.
  • Optimizing Routing Area Information Flows The present invention includes two methods for optimizing Routing Area (RA) information flows, both of which involve delaying certain functions until after the handover process is completed. a.
  • the first problem is that an additional Location Area Update Accept message is returned to the MS to transfer the result of the Location Update response received -15- at the new serving SGSN. This introduces an extra interruption of the real-time payload, but the delay can be minimized by avoiding the reallocation of a TBF.
  • the second problem is that the response from the network is also delayed with respect to the point in time when the real-time payload resumes.
  • the mobility management procedure triggered by the RA Update is not completed until the location update process has terminated.
  • the scope of GMM procedures associated with GMM state transitions are modified.
  • the MS may be required to make a new GPRS attach or new PDP context activation, as indicated by the SGSN in the SGSN-initiated GPRS Detach procedure.
  • the reason for the failure justifies that the call be aborted.
  • a fallback procedure must then be implemented to send the MS back to the old SGSN.
  • the third problem is that there is an increased likelihood that incoming circuit- switched calls maybe delivered to the wrong MSC/VLR due to delays in updating the MSC/VLR location and the SGSN-MSC/VLR association. These calls could not be completed as specified by the subscriber profile (e.g., CAW, TRN, TRB, etc.). It should be noted that this situation does not apply in a circuit-switched network since the Mobility State is not changed at inter-MSC handover.
  • the subscriber profile e.g., CAW, TRN, TRB, etc.
  • the Security Functions may be delayed in order to reduce the interruption time for the RA updates. This is achieved by postponing optional security procedures until after data transfer resumes.
  • the SGSN may choose not to perform any of the security procedures. All of the security parameters are maintained as they were before handover, and the authentication triplets have already been downloaded into the new SGSN as a part of the SGSN-context transfer. The SGSN and the MS continue to use the same ciphering algorithm as before the handover. Since TLLI/P-TMSI reallocation is already a part of the RA Update procedure, there is no need to duplicate this procedure by having a -16- separate P-TMSI reallocation procedure. The only security procedure left is the identity check, which does not have to be performed during handover. If a signaling exchange with the EIR occurs, handover delay increases. While postponing these security procedures may further increase the likelihood of delayed failure discovery, and introduce additional interruption of the real-time payload, this can be minimized by avoiding the reallocation of a TBF.
  • the GMM mobility context handling (04.08) is updated to extend the mobility procedure or change the Mobility Context State handling after the RA Update is completed. It is unlikely that the failure of the HLR location update procedures can be avoided; therefore, the MS may have to be redirected to the old SGSN.
  • the security procedures can be postponed till after the RA update procedure terminates and data transfer resumes. The effect of the above procedures is to avoid the reallocation of TBF and thus keep the interruption time to a minimum.
  • one of the following approaches can be taken:
  • the IP paradigm allows for handling of new applications and services outside of the traditional infrastructures. Tracking of the subscriber's location in the TDMA circuit switched or RT packet-switched network can be handled by a service layer VAS (value added service) function. This allows, for instance, the delivery of incoming ANSI-41 PSTN/PLMN voice calls to the RT IS-136HS VoIP infrastructures where the subscriber is active (e.g., a mobility gateway can handle -17-
  • VAS value added service
  • ANSI-41 call delivery and other service interaction when the MS is located in the RT PS network • All RT services are provided from the service layer, so they appear the same on all access networks which are a part of the IP network.
  • ANSI-41 services such as basic, supplementary, and WIN services may be implemented/replicated (either fully or in part) in the service layer, as value added service to existing IP services (VAS voice services).
  • VAS voice services value added service to existing IP services
  • HLR, SCP, and Special Resource Functions (SRF) may be functionally mapped to IP-specific associated functionality, although the mechanics of implementation of the services may be different from that implemented over ANSI-41.
  • FIG. 3 is a simplified functional block diagram illustrating the traffic shaping function for delay-sensitive and loss-sensitive traffic requirements. Profile policing is performed at 45 for loss-sensitive traffic such as Best
  • Effort traffic which is then buffered at 48 and 49.
  • delay-sensitive traffic such as speech and RT streaming
  • the packets that do not adhere to the profile are dropped at 46.
  • the others are buffered at 47 and 49.
  • Important considerations for determining the criteria for dropping packets include the following: a. Shaping for real-time service requires that the ordering be preserved, especially when dropping a packet; b. Compression/decompression works synchronously and needs to resynchronize when packets are dropped; and c. Encryption, when state driven, may also need to be resynchronized. As discussed above, the handover interruption has the effect of a faster increase in the number of queued packets per session in the associated buffer.
  • a queuing approach based on the "leaky bucket” is used at 46.
  • a variation of the WFQ algorithm can be used or, as an alternative, a less complex method can be used which consists of time-stamping the packets in order to calculate the rate of packet queuing in comparison with the profile/service specification.
  • the present invention includes two

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Abstract

L'invention concerne un procédé d'amélioration de procédures de changement de cellule dans un réseau de radiotélécommunication à service radio paquet général (GPRS) permettant de réduire le temps d'interruption de transfert tout en maintenant les délais à des valeurs abordables pour des services de données utiles en temps réel. L'interruption de flux de données est réduite au niveau interface radio et au niveau réseau central. Des améliorations au niveau de l'interface radio sont apportées par réduction du temps de récupération des informations système et par pré-affectation des ressources radio avant que la station mobile n'accède à la nouvelle cellule. Par ailleurs, des améliorations sont apportées dans le réseau central par réduction de l'intervalle d'interruption mise à jour de la zone d'acheminement inter-SGSN, par application d'exigences sensibles au retard et à faible temps d'attente et par modulation du trafic par paquets du trafic de première qualité.
EP00944541A 1999-06-21 2000-06-16 Procede de transfert de stations mobiles dans un reseau de radiotelecommunication a service de radio paquet general (gprs) Withdrawn EP1188340A2 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US502511 1995-07-13
US14034699P 1999-06-21 1999-06-21
US140346P 1999-06-21
US50251100A 2000-02-11 2000-02-11
PCT/SE2000/001277 WO2000079808A2 (fr) 1999-06-21 2000-06-16 Procede de transfert de stations mobiles dans un reseau de radiotelecommunication a service de radio paquet general (gprs)

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EP1188340A2 true EP1188340A2 (fr) 2002-03-20

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AU (1) AU5862600A (fr)
CA (1) CA2376004A1 (fr)
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CA2376004A1 (fr) 2000-12-28

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