WO2005062551A1 - Prevention de perturbation de trafic gprs/umts - Google Patents

Prevention de perturbation de trafic gprs/umts Download PDF

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Publication number
WO2005062551A1
WO2005062551A1 PCT/NO2003/000434 NO0300434W WO2005062551A1 WO 2005062551 A1 WO2005062551 A1 WO 2005062551A1 NO 0300434 W NO0300434 W NO 0300434W WO 2005062551 A1 WO2005062551 A1 WO 2005062551A1
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WO
WIPO (PCT)
Prior art keywords
receivers
sender
timer
flag
state
Prior art date
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PCT/NO2003/000434
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English (en)
Inventor
Per Magne Lindvik Hoff
Per Øyvind ØDEGAARD
Ezzat Kaafarani
Paul Schliwa-Bertling
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.)
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Application filed by Telefonaktiebolaget Lm Ericsson (Publ) filed Critical Telefonaktiebolaget Lm Ericsson (Publ)
Priority to PCT/NO2003/000434 priority Critical patent/WO2005062551A1/fr
Priority to AU2003291783A priority patent/AU2003291783A1/en
Publication of WO2005062551A1 publication Critical patent/WO2005062551A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/27—Transitions between radio resource control [RRC] states
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks

Definitions

  • the present invention relates to packet switched communication within mobile communication network, more particularly to half duplex communication over such networks .
  • Such services can be streaming of data, broadcast services, narrowcasting, multi-casting, anycasting, that is; when the closest member of a group retransmits, using multicasting, a pet child has many names, the common feature being one transmitter is sending information to one or more receivers, using unacknowledged modes.
  • There are a lot of services from ISP's most common are maybe the download services, that is, services where subscribers can download content to their mobile station, such as multimedia files etc. These services are quite often streaming services, using unacknowledged mode and they often need quite long periods of downloading without any interruption.
  • the GPRS bearer service has a nasty non-transparent feature: SGSN must regularly halt the downlink flow and get a confirmation of the current MS cell position. This procedure is denoted as Paging and is initiated by SGSN, and performed by BSS. Downlink is the direction from SGSN to MS. This problem exists when these three conditions apply:
  • Payload is only sent from SGSN for a long period (more than 44 sec) without any response from the mobile .
  • the mobile does not change radio cell.
  • FIG. 1 and 2 shows the LLC and GMM protocols in its correct environment within the GPRS.
  • Figure 1 show the protocol stack used for payload (e.g., IP-packets) and
  • Figure 2 shows the protocol stack involved when MS and SGSN wants to do signalling, including Short Message Service (SMS) .
  • SMS Short Message Service
  • the state GMM machine that contains READY state is located in GMM layer in both SGSN and MS, as shown in fig. 3.
  • the BSSGP layer at BSS adds cell position to all messages sent from MS to SGSN.
  • Figure 3 describes the following state transitions (quote from ref [3] ) :
  • Implicit Detach The MM and PDP contexts in the SGSN shall return to IDLE and INACTIVE state.
  • the MM and PDP contexts in the SGSN may be deleted.
  • the GGSN PDP contexts shall be deleted.
  • Cancel Location The SGSN receives a MAP Cancel Location message from the HLR, and removes the MM and PDP contexts. Moving from STANDBY to READY: PDU transmission: The MS sends a LLC PDU to the SGSN, possibly in response to a page.
  • the SGSN receives a LLC PDU from the MS.
  • READY timer expiry The MS and the SGSN MM contexts return to STANDBY state.
  • the SGSN indicates an immediate return to STANDBY state before the READY timer expires.
  • Abnormal RLC condition The SGSN MM context returns to STANDBY state in case of delivery problems on the radio interface or in case of irrecoverable disruption of a radio transmission.
  • GPRS Detach The MS or the network requests that the MM contexts return to IDLE state and that the PDP contexts return to INACTIVE state.
  • the SGSN may delete the MM and PDP contexts.
  • the PDP contexts in the GGSN shall be deleted.
  • the SGSN receives a MAP Cancel Location message from the HLR, and removes the MM and PDP contexts .
  • FIG. 4 shows the sequence as described in this specific example. References to Figure 4 are made when appropriate.
  • the GPRS Mobility Management (GMM, also denoted as MM) in both SGSN and MS has a state machine which includes a READY State, see Figure 3.
  • GMM GPRS Mobility Management
  • the READY state is entered when an LLC-PDU has been sent to SGSN.
  • the READY state is entered when a LLC-PDU has been received from the MS, see Figure 3 above.
  • the READY Timer T3314 is started in the SGSN according to Ref .
  • LLC UI frame is one type of LLC- PDU.
  • the content of an LLC UI frame is either payload or signalling. If new LLC-PDU' s (e.g., payload) shall be sent to the MS when not being in READY state (Fig. 4, arrow 6), the SGSN will initiate the Paging procedure. SGSN orders BSS to page the MS (Fig. 4, arrow 6). When the MS detects the Paging signal on the air interface (Fig.
  • the MS will send an LLC-PDU to SGSN (Fig. 4, arrow 7) .
  • the BSS will add the cell position to the message sent from the MS.
  • the SGSN will 1) store the reported cell position, 2) enter READY state and 3) start READY Timer (Fig. 4, arrow 7) .
  • the LLC-PDU that triggered the Paging is sent to the MS (Fig. 4, arrow 8) .
  • the rationale behind this scheme is to ensure that MS is still able to receive the information sent from SGSN.
  • the SGSN must tell BSS where the MS is located for all MS terminated traffic.
  • the SGSN can send several thousands UI frames with payload to the MS without any response from the MS.
  • the above scheme has one major weakness. If the traffic flows only from SGSN to MS, and the application at the MS side does not have to send any response, and the MS does not change cell, the flow of payload to the MS is disturbed, each time the READY timer expires. The flow of payload will resume after a reception of the Cell Update, the response on the Paging request. If the MS changes radio cell when being in READY state, the MS has to initiate a Cell Update, i.e., send a LLC-PDU to SGSN which stores the new cell position. There are two variants of Cell Update: 1.
  • the original Cell Update procedure as specified in the first GPRS release (R97) If the MS changes radio cell when being in READY state, the MS has to initiate a Cell Update, i.e., send a LLC-PDU, i.e., an UI frame with no user data (empty) to SGSN which stores the new cell position, and restarts the READY timer.
  • a LLC-PDU i.e., an UI frame with no user data (empty)
  • the application (s) running at the MS-side must ensure to send something at regular basis.
  • the application must send some kind of response in due time for the GMM READY timer to expire, typically in due time before the typical expiration period of 44 second. This is a problem for, at least, the following two reasons:
  • the expiry time for the GMM READY timer might be PLMN specific, i.e., the application must be informed about the current setting of the READY timer value. I.e., the MS application and GMM in the MS must interact with each other, implying a dependency to get the application (s) to work well.
  • Another solution is to restart READY timer due to handling of downlink, DL, traffic in both MS and SGSN.
  • LLC acknowledged mode of operation will force the MS to send an acknowledgment for every received DL payload packet.
  • this approach will require an allocated uplink radio resource in addition to the allocated downlink radio resource. I.e., bigger demand for UL, up-link, radio resources and more UL LLC ack. packets must be sent.
  • the present invention provides a method within telecommunication network for interruption free unidirectional communication between a sender (2) and one or more receivers (1), where the communicated traffic is of a unacknowledged type and the sender (2) and the one or more receivers (1) constitutes a run time timer that is started at initialization of a new traffic session, the traffic session will run uninterrupted while the timer (s) is/are running, and the timer (s) have/has a fixed or prechosen run time before time out, said time out will start a sender initiated procedure so as to restart the run time timer specified in that simultaneously or substantially simultaneously as the run time timer (s) has/have been initialized, the method further comprises the following steps:
  • a flag is set to a first state at the sender (2) or at the one or more receivers (1),
  • a restart procedure is initiated by the sender(2) or by the one or more receivers (1).
  • Figure 1 shows the transmission plane, including the LLC and GMM protocols within GPRS networks.
  • Figure 2 shows the signalling plane, MS ⁇ -> SGSN, including SMS.
  • Figure 3 shows functional Mobility Management State Model (from ref. [3]) for an MS and an SGSN.
  • Figure 4 shows DL traffic only as is known from the prior art interrupted by paging.
  • Figure 5 shows a first preferred embodiment of the present invention, where SGSN initiates XID negotiation prior to expiry of READY timer.
  • Figure 6 a second preferred embodiment according to the present invention, where the MS sends an empty LLC UI frame prior to expiry of the READY timer.
  • Figure 7 shows a third preferred embodiment of the present invention, where the MS initiates XID negotiation prior to expiry of READY timer. Detailed description of the invention
  • the basic solution is the introduction of a flag that can be set to a first certain state at the transmitting party or at the receiving side when the READY timer is started.
  • This flag is set to an opposite state than the first state for each handled downlink package.
  • one can of course also start a subroutine that is testing the status of the flag for each handled downlink package thus avoiding the setting of the flag for each handled package.
  • the choice of either running a test or setting the flag for each handled package is not important, as both solutions are revealing the same result; the latter however needs less software programming.
  • a preset, or operator chosen period, before the expiration of the READY timer a action either from the one or more mobile stations (s) or from the transmitting party must be invoked as to restart the READY timer and thus prohibiting unnecessary paging.
  • Choosing the mobile stations or the transmitting parties as the initiators of the needed action will not affect the result, and they are to be looked upon as merely two opposite solutions. However if the mobile station (s) is/are the initiator (s) , then each single mobile station participating in the said session must be adapted to this solution, thus a much more elaborating upgrade than having the transmitting party as the initiator.
  • the action can be either to start some kind of negotiation between the communicating parties participating in said session or it can be that a valid and empty payload frame is transmitted from the mobile station (s) to the transmitting party, in case of the latter the mobile station (s) will simultaneously or substantially simultaneously restart its READY timer (s) (run time timers) and simultaneously or substantially simultaneously set the flag to the first state.
  • the transmitting party or the mobile station (s) initiates a negotiation and the corresponding negotiation signalling is transmitted to either the transmitting party, if the mobile stations where the initiators, or to the mobile stations if the transmitting party where the initiator.
  • the mobile station (s) will transmit a first response to the invitation to negotiate and restart its/their READY timer (s), at the time of, or substantially at the time of reception of the first response from the mobile stations (s) will the transmitting party restart its timer and simultaneously or substantially simultaneously set the first flag to the first state.
  • the transmitting party will at the time of or substantially at the time of reception of the negotiation signalling originating from the mobile station (s) responds to the received negotiations signalling and simultaneously or substantially simultaneously restart its READY timer (run time timer) .
  • Method 1 this method must be implemented in SGSN, in case of operation within GPRS networks, for GSM, and all existing mobile station types will see the improvement (no regular disruption of downlink traffic). SGSN's supporting Method 1 will be perceived as better compared to SGSN's not supporting this method. This method can be described as the transmitting party initiated negotiation method.
  • Method 2 is the method where the mobile station is sending a valid and empty payload frame. It must be implemented in the mobile station for GSM. Method 2 will help a mobile station vendor to offer good Push-To-Talk support even when the SGSN has not implemented Method 1 in case of GPRS communication.
  • Method 3 must be implemented in the mobile station for GSM in case of GPRS sessions. This method can be described as the mobile station (s) initiated negotiations method. Very similar to Method 2, one more message must be sent, thus less optimal. Method 3 will help a MS vendor to offer good Push-To-Talk support even when the SGSN has not implemented Method 1.
  • Method 1 can inter work with Method 2 or Method 1 can inter work with Method 3.
  • the SGSN supporting Method 1 will be perceived as better from all its attached MS's (no matter of type) compared to a SGSN not supporting it.
  • Method 2 or 3 will help a MS vendor to offer good Push-To- Talk support even when the SGSN has not implemented Method 1.
  • Method 1 can inter work with Method 2 or Method 1 can inter work with Method 3.
  • This invention is not tied to a specific 3GPP release of the standards.
  • the references are made to Release 5 of the GPRS standards, but this invention is also applicable to earlier or later releases where LLC and GMM layers exist at the Gb-interface .
  • it will be applicable wherever there is uni directional traffic between a transmitting party and one or more receiving parties, where the receiving parties communicates via radio links, and further there is one or more run time timers that are started at the initialization of a the session and if the run time timers at its expiration causes an interrupt in the session. Still further it must be possible to restart the mentioned timers so as to "virtually" start a new session.
  • the present invention is also applicable for generations of Mobile systems after GPRS.
  • GPRS for GSM is a 2.5 th generation of Mobile standards. This Patent Idea is also relevant for generations of Mobile systems after GPRS where equipment between MS and service provider are not allowed to send payload to the MS after a while due too old reported radio position of the MS.
  • SGSN takes action to provoke a MS to send an LLC PDU
  • Figure 5 shows the sequence described here. References to Figure 5 are made when appropriate.
  • the following example is a typical real life example taking into account parameter values for the timers etc.
  • the SGSN has a flag per MS which is set to true each time a DL packet is handled. It should be noted, as described earlier, that it is not important whether the flag is set for each packet or if it is set for the first package and tested for in the following sequences. This flag is denoted as "Handled-DL" in figure 5.
  • SGSN will initiate an XID negotiation of a parameter, e.g., the maximum size of the LLC PDU used for GMM signalling (Fig. 5, arrow 3) .
  • the SGSN will propose the same maximum value as before.
  • a typical value for Z is 4 seconds.
  • the MS receives this request (Fig. 5, arrow 3), it has to respond either with accept or reject to the new value, see Ref [1], Section 6.4.1.6. Note that an XID negotiation can be interleaved into the flow of DL LLC frames containing payload (Fig. 5, arrow 3, 4 and 5).
  • the SGSN When the SGSN receives the response on the XID negotiation, the 1) current Radio Cell position is stored, 2) the READY timer is restarted and 3) the "Handled-DL" flag is set to false (Fig. 5, arrow 5) . In both cases, accept or reject of new value, the max size value is unchanged, and no functional change has been performed. The SGSN has achieved the intention to receive an updated cell position and prolong the time in READY state. Thus, a paging has been avoided and the ongoing MS terminated traffic Flow is not disturbed (Fig. 5, arrow 6 and 7) .
  • the SGSN can send several thousands UI frames with payload to the MS without any response from the MS.
  • a MS sends an empty LLC UI LLC frame before expiry of the READY timer
  • the MS has flag which is set to true each time a DL packet is handled or set to true the first time a DL packet is handled and the next time a DL packet is handled a false/true test is performed.
  • This flag is denoted as "Handled-DL” in Figure 6.
  • Typical value for Z will be 4 seconds.
  • the current Radio Cell position will be added to the Cell Update by BSS.
  • the READY timer will be restarted in SGSN upon reception of UL LLC PDU (Fig. 6 arrow 4) . Thus, a paging has been avoided and the ongoing MS terminated traffic flow is not disturbed.
  • Method 2 will work even when Cell Notification procedure is agreed upon between SGSN and MS.
  • Cell Notification procedure is the improved Cell Update procedure.
  • a MS sends an XID negotiation before expiry of the READY timer
  • Method three This is a variant of Method 2, referred to as method three, instead of sending empty LLC UI frame, an LLC U frame containing XID negotiation is sent from the MS. This will force SGSN to respond to the XID negation and thus send an unnecessary DL packet.
  • FIG. 7 shows the sequence described here. References to Figure 7 are made when appropriate.
  • the MS has a flag per MS which is set to true each time a DL packet is handled or tests as described according to the two above mentioned embodiments may be performed regarding the flag status.
  • This flag is denoted as "Handled-DL" in Figure 7.
  • Z seconds before the READY timer in the MS has expired, and DL traffic has been received after last start of the READY timer the MS will initiate an XID negotiation of e.g., the maximum size of the LLC PDU used for GMM signalling.
  • the MS will propose the same maximum size as before (Fig. 7, arrow 4). Note that an XID negotiation can be interleaved into the flow of DL LLC frames containing payload (Fig. 7, arrows 3 to 7).
  • the SGSN When the SGSN receives the XID request; 1) the current Radio Cell position is stored and 2) the READY timer is restarted (Fig. 7, arrow 4). The SGSN will accept or reject the change and send it in a U frame back to the MS (Fig. 7, arrow 6) .
  • the intention has been achieved; to inform the SGSN with an updated cell position and prolong the time in READY state.
  • a paging has been avoided and the ongoing MS terminated traffic Flow is not disturbed.
  • the SGSN can send several thousands UI frames with payload to the MS without any response from the MS.
  • 3GPP TS 44.064 "3rd Generation Partnership Project; Technical Specification Group Core Network; Mobile Station - Serving GPRS Support Node (MS-SGSN) ; Logical Link Control (LLC) layer specification; (Release 5), version 5.1.0, March 2002.
  • MS-SGSN Mobile Station - Serving GPRS Support Node
  • LLC Logical Link Control
  • 3GPP TS 23.060 "3rd Generation Partnership Project; Technical Specification Group Services and System Aspects; General Packet Radio Service (GPRS) ; Service Description; Stage 2, (Release 6)", version 6.1.0, June 2003.
  • GPRS General Packet Radio Service
  • Cell-Id Identifies uniquely a radio cell within a BSS
  • a GSM MS may use discontinuous reception (DRX) or not. If using DRX, the MS shall also be able to specify other DRX parameters that indicate the delay for the network to send a page request or a channel assignment to the MS (see GSM 03.64). The DRX parameters shall be indicated by the MS in the attach procedure. The SGSN shall then send these parameters in each page request to the BSS that uses this information and the IMSI to calculate the correct paging group. DRX usage is independent of the MM states IDLE, STANDBY and READY. When a GPRS MS in READY state uses DRX, DRX has to be considered when assigning a packet data channel for downlink transfer. The SGSN shall therefore indicate the DRX parameters for the MS in all packet transmission

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

Abstract

L'invention concerne un procédé applicable dans un réseau de télécommunications GPRS/UMTS, permettant d'assurer des communications unidirectionnelles sans interruption entre un émetteur (2) et un ou plusieurs récepteurs (1), sachant que le trafic est écoulé en mode sans accusé de réception, et que l'émetteur (2) et le ou les récepteurs (1) constituent un temporisateur de temps d'exécution lancé à l'initialisation d'une nouvelle session de trafic. La session n'est pas interrompue tant que le ou les temporisateurs fonctionnent ; la durée d'exécution du ou des temporisateurs est fixe ou préétablie avant la temporisation, et cette temporisation entraîne une procédure engagée par l'utilisateur de manière à relancer le ou les temporisateurs considérés simultanément ou sensiblement simultanément par rapport à l'initialisation du ou des temporisateurs.
PCT/NO2003/000434 2003-12-22 2003-12-22 Prevention de perturbation de trafic gprs/umts WO2005062551A1 (fr)

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PCT/NO2003/000434 WO2005062551A1 (fr) 2003-12-22 2003-12-22 Prevention de perturbation de trafic gprs/umts
AU2003291783A AU2003291783A1 (en) 2003-12-22 2003-12-22 Avoid disruption of gprs/umts traffic

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013179155A1 (fr) * 2012-05-30 2013-12-05 Telefonaktiebolaget L M Ericsson (Publ) Mise à jour de cellule pour procédures d'accès à un système optimisées, entre des systèmes secondaires de station de base et des stations mobiles

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EP1021017A2 (fr) * 1999-01-11 2000-07-19 Nokia Mobile Phones Ltd. Procédé et dispositifs permettant d'une connexion radio par paquets continu
WO2001047206A2 (fr) * 1999-12-22 2001-06-28 Nokia Corporation Changement des parametres xid/pdcp pendant la connexion
WO2001054338A1 (fr) * 2000-01-21 2001-07-26 Nokia Corporation Procede et appareil pour mecanisme d'emission selective d'un accuse de reception
EP1198147A2 (fr) * 2000-10-13 2002-04-17 Telefonaktiebolaget L M Ericsson (Publ) Système et procédé de couplage des noeuds dans un réseau d'acces radio de la troisième génération
US20020089942A1 (en) * 2000-11-30 2002-07-11 Matti Seppa Communication of data
WO2002054794A2 (fr) * 2000-12-29 2002-07-11 Telefonaktiebolaget Lm Ericsson (Publ) Procedes et dispositifs associes a la maintenance des connexions dans un reseau gprs
US20030100268A1 (en) * 2001-11-16 2003-05-29 Koninklijke Philips Electronics N.V. Radio communication system

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1021017A2 (fr) * 1999-01-11 2000-07-19 Nokia Mobile Phones Ltd. Procédé et dispositifs permettant d'une connexion radio par paquets continu
WO2001047206A2 (fr) * 1999-12-22 2001-06-28 Nokia Corporation Changement des parametres xid/pdcp pendant la connexion
WO2001054338A1 (fr) * 2000-01-21 2001-07-26 Nokia Corporation Procede et appareil pour mecanisme d'emission selective d'un accuse de reception
EP1198147A2 (fr) * 2000-10-13 2002-04-17 Telefonaktiebolaget L M Ericsson (Publ) Système et procédé de couplage des noeuds dans un réseau d'acces radio de la troisième génération
US20020089942A1 (en) * 2000-11-30 2002-07-11 Matti Seppa Communication of data
WO2002054794A2 (fr) * 2000-12-29 2002-07-11 Telefonaktiebolaget Lm Ericsson (Publ) Procedes et dispositifs associes a la maintenance des connexions dans un reseau gprs
US20030100268A1 (en) * 2001-11-16 2003-05-29 Koninklijke Philips Electronics N.V. Radio communication system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013179155A1 (fr) * 2012-05-30 2013-12-05 Telefonaktiebolaget L M Ericsson (Publ) Mise à jour de cellule pour procédures d'accès à un système optimisées, entre des systèmes secondaires de station de base et des stations mobiles

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