WO2001047289A2 - Frame synchronisation between a mobile station and a base station during handover - Google Patents

Frame synchronisation between a mobile station and a base station during handover Download PDF

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Publication number
WO2001047289A2
WO2001047289A2 PCT/DE2000/004606 DE0004606W WO0147289A2 WO 2001047289 A2 WO2001047289 A2 WO 2001047289A2 DE 0004606 W DE0004606 W DE 0004606W WO 0147289 A2 WO0147289 A2 WO 0147289A2
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WO
WIPO (PCT)
Prior art keywords
transmitter
bsn
terminal
receiver station
frame number
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PCT/DE2000/004606
Other languages
German (de)
French (fr)
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WO2001047289A3 (en
Inventor
Stefan Oestreich
Marcus Purat
Volker Sommer
Jean-Michel Traynard
Original Assignee
Siemens Aktiengesellschaft
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Application filed by Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Priority to AU33599/01A priority Critical patent/AU3359901A/en
Publication of WO2001047289A2 publication Critical patent/WO2001047289A2/en
Publication of WO2001047289A3 publication Critical patent/WO2001047289A3/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
    • H04W74/0866—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a dedicated channel for access

Definitions

  • the invention relates to a method for synchronizing the frame number and / or the time of transmission between a mobile terminal and a second mobile radio network during a handover and a radio communication system for implementing the method.
  • information for example voice, image information or other data
  • information is transmitted with the aid of electromagnetic waves via a radio interface between the sending and receiving station (base station or subscriber station).
  • the electromagnetic waves are emitted at carrier frequencies that lie in the frequency band provided for the respective system.
  • future mobile radio systems with CDMA or TD / CDMA transmission methods via the radio interface for example the UMTS (Universal Mobile Telecommunications System) or other 3rd generation systems, frequencies in the frequency band of approx. 2000 MHz are provided.
  • UMTS Universal Mobile Telecommunications System
  • the transmission frames are identified with a number. This serves, among other things, to define multi-frames, to encrypt, to interleave and to mark certain times.
  • This number is usually determined by a base station or the assigned network and transmitted to all or only to individual mobile terminals or stations via information or broadcast channels. These stations decode the received information and can use the frame number (RN) contained therein to establish synchronization with the frame number in the network.
  • RN frame number
  • a mobile station e.g. B. in the GSM network befin ⁇ det, measurements at, for example, the broadcast channels of cells of a UTRA TDD system (TDD: Time Division Duplex) by lead.
  • TDD Time Division Duplex
  • the frame number is only very rarely transmitted on the broadcast channels. A mobile station therefore had to decode the broadcast channel over a long period of time in order to be able to read the frame number.
  • a handover is initiated with a handover command.
  • a request is sent to the neighboring cell (NZ) via the network.
  • the neighboring cell sends a handover request (handover CMD 1) via the network to the GSM system and this in turn via the air interface to the mobile station.
  • handover CMD 1 the handover request
  • the mobile station can switch to the new cell, two pieces of information are required, namely the relative reception time (timing advance) and the frame number.
  • This base station measures the time of reception of this request and transmits a corresponding timing advance value or via the GSM network, in which the mobile station is still located, and the GSM air interface parts. a corresponding command to the mobile station, with which the latter can control the later transmission in the new cell in such a way that its signals arrive at the base station of the new cell synchronously with the signals from other mobile stations.
  • the mobile station can always interrupt the GSM connection again for short periods of time
  • the invention has for its object an improved method for frame synchronization and the determination and transmission of the timing advance value between a mobile terminal and a transmitter / receiver station, in particular a base station during a handover and a radio communication system for implementing the method provide.
  • the message tells the mobile station which frame number the frame had when it sent the access request to the second, new base station.
  • the synchronization of the frame number is thus established and can be maintained in a simple manner, so that the mobile station can switch to the new base station without the organization channel number having to search time consuming and interruption of the connection to the old base station to the frame ⁇ .
  • the mobile terminal receives the timing advance value in the same way, which it needs in order to be able to send data immediately after a handover in the new cell.
  • the frame numbers m old and new cells are synchronized, for example only the timing advance value without a frame number is signaled to the mobile station.
  • connection of the mobile station in the GSM network thus advantageously only has to be briefly interrupted once in order to be able to send the access request.
  • Fig. 1 is a block diagram of a known mobile radio system
  • Fig. 2 is a schematic flow diagram of a method for performing a handover.
  • the mobile radio system shown in FIG. 1 as an example of a known radio communication system consists of a multiplicity of network elements NE, in particular of mobile switching centers MSC, facilities RNM and base stations BS.
  • the mobile switching centers MSC which are networked with one another, provide access to a fixed network PSTN. Furthermore, these mobile switching centers are each with at least MSC connected to an RNM facility for allocating radio resources.
  • Each of these devices RNM in turn enables a connection to at least one base station BS.
  • Such a base station BS can establish a connection to subscriber stations, for example mobile stations MS or other mobile and stationary terminal devices, via a radio interface.
  • At least one radio cell Z is formed by each base station BS. In the case of sectorization or hierarchical cell structures, several radio cells Z are also supplied per base station BS.
  • FIG. 1 shows, by way of example, existing connections VI, V2, V3 for the transmission of useful information and signaling information between mobile stations MS and a base station BS and a request for resource allocation or a short confirmation message in an access channel R ⁇ CH by another mobile station MS shown.
  • an organization channel BCCH: Broadcast Control CHannel
  • BCCH Broadcast Control CHannel
  • An operation and maintenance center OMC implements control and maintenance functions for the mobile radio system or for parts thereof.
  • the functionality of this structure can be transferred to other radio communication systems, in particular for subscriber access networks with a wireless subscriber line.
  • FIG. 2 An exemplary embodiment of a transfer method described below is sketched in FIG. 2, solid lines representing processes in the old cell Z and dashed lines representing processes in the new cell ZN.
  • the new cell ZN can also be assigned to a second, similarly constructed mobile radio system which, for. B. is connected to the first via landline channels.
  • the mobile station MS transmits the random access request RA to the new cell thereby ZN and stores it, or ⁇ toward the instant in time at which it is sent. Then it resumes traffic with the old base station BS via the old connection V3.
  • the base station BSN of the new cell ZN reports the frame number RN of the frame to which it has received the access request RA and / or the timing advance value or the relative reception time and possibly other messages in a second transfer instruction 2 or a handover command 2 to the mobile station MS.
  • the second handover instruction can be sent directly from the new base station BSN or from there via the GSM network and the old base station BS to the mobile station MS.
  • the transmission of the information to the mobile station MS is e.g. possible via a UTRA-BTS (BTS: base station), a UTRA core network (UTRA core network), a GSM core network (GSM core network) or the GSM-BTS.
  • the mobile station MS thereby knows which frame number RN had the frame in which it had sent the access request RA to the base station BSN.
  • the synchronization of the frame number RN is thus established and can be maintained by simply continuing to pay so that the mobile station MS can switch to the new base station BSN in a subsequent step without time-consuming on its organizational channel BCCH and with the interruption of the connection to the old base station BS after the Need to search frame number RN.
  • the MS also knows the timing advance and can immediately send data to the new cell.
  • the mobile station MS then continues the communication m of the newly established connection V4 via the new base station BSN.
  • connection of the terminal usually a mobile station MS, must be in the GSM network thus advantageously only briefly interrupted once in order to be able to send the access request RA.
  • the terminal MS calculates the difference between the frame numbers of the connection V3 and the cell ZN and transmits this difference to a network element. This difference is buffered there and, if necessary, sent to other end devices, which also prepare a handover from cell Z to cell ZN. In this way, these terminal devices already know the frame number m of the cell ZN in advance.

Abstract

The invention relates to a method for the frame synchronisation between a mobile terminal (MS) and two base stations (BS, BSN) during handover. The invention also relates to a radio communications system for carrying out said method. The aim of the invention is to shorten the interruption time(s) of the communications connection (V3). The second base station (BSN) communicates a current frame number (RN) and/or the timing advance value to the mobile terminal after a signal (RA) has been sent by the mobile terminal via the channel for random access (RACH). The frame number is thus synchronised in such a way that the mobile station can switch to the new base station (BSN) without having to expend a lot of time searching for the frame number on the organisation channel (BCCH) of said base station and by interrupting the connection to the old base station (BS). The connection (V3) of the mobile station in the GSM network has to be briefly interrupted only once in order to be able to send the access request (RA). The mobile terminal in the new cell can immediately send data due to the fact that the timing advance value has already been received in the old cell.

Description

Beschreibungdescription
Rahmensynchronisation zwischen einer Mobilstation und einer Basisstation beim HandoverFrame synchronization between a mobile station and a base station during handover
Die Erfindung betrifft ein Verfahren zur Synchronisation der Rahmennummer und/oder des Sendezeitpunktes zwischen einem mobilen Endgerat und einem zweiten Mobilfunknetz bei einer Übergabe (Handover) sowie ein Funk-Kommunikationssystem zum Umsetzen des Verfahrens.The invention relates to a method for synchronizing the frame number and / or the time of transmission between a mobile terminal and a second mobile radio network during a handover and a radio communication system for implementing the method.
In Funk-Kommunikationssystemen werden Informationen (beispielsweise Sprache, Bildinformationen oder andere Daten) mit Hilfe von elektromagnetischen Wellen über eine Funkschnittstelle zwischen sendender und empfangender Station (Basissta- tion bzw. Teilnehmerstation) übertragen. Das Abstrahlen der elektromagnetischen Wellen erfolgt dabei mit Tragerfrequenzen, die m dem für das jeweilige System vorgesehenen Frequenzband liegen. Für zukunftige MobilfunkSysteme mit CDMA- oder TD/CDMA-Ubertragungsverfahren über die Funkschnitt- stelle, beispielsweise das UMTS (Universal Mobile Telecommu- nication System) oder andere Systeme der 3. Generation sind Frequenzen im Frequenzband von ca. 2000 MHz vorgesehen.In radio communication systems, information (for example voice, image information or other data) is transmitted with the aid of electromagnetic waves via a radio interface between the sending and receiving station (base station or subscriber station). The electromagnetic waves are emitted at carrier frequencies that lie in the frequency band provided for the respective system. For future mobile radio systems with CDMA or TD / CDMA transmission methods via the radio interface, for example the UMTS (Universal Mobile Telecommunications System) or other 3rd generation systems, frequencies in the frequency band of approx. 2000 MHz are provided.
In fast allen Mobilfunksystemen werden die Ubertragungsrahmen mit einer Nummer gekennzeichnet. Dies dient u. a. zum Defi- nieren von Multirahmen, zum Verschlüsseln, zum Interleavmg und zum Markieren bestimmter Zeitpunkte. Diese Nummer wird m der Regel von einer Basisstation oder dem zugeordneten Netzwerk festgelegt und über Informations- bzw. Broadcast-Kanale zu allen oder auch nur zu einzelnen mobilen Endgeraten bzw. Stationen übertragen. Diese Station (en) dekodieren die empfangene Information und können über die darin enthaltene Rahmennummer (RN) die Synchronisation mit der Rahmennummeπerung im Netzwerk herstellen. Problematisch ist dies jedoch beim Handover. Zum Beispiel kann eine mobile Station, d e sich z. B. im GSM-Netz befin¬ det, Messungen auf beispielsweise den Broadcastkanalen von Zellen eines UTRA-TDD Systems (TDD: Time Division Duplex) durchfuhren. Zunächst wird dabei nur die Empfangsleistung der Nachbarzellen gemessen, um festzustellen, ob der Empfang von Signalen aus der Nachbarzelle besser als der Empfang von Signalen aus der eigenen Zelle ist. Dabei wird keine Information auf den Broadcastkanalen (BK) dekodiert, da die Zeit m der Regel nicht ausreicht, einen kompletten Zeitschlitz derIn almost all mobile radio systems, the transmission frames are identified with a number. This serves, among other things, to define multi-frames, to encrypt, to interleave and to mark certain times. This number is usually determined by a base station or the assigned network and transmitted to all or only to individual mobile terminals or stations via information or broadcast channels. These stations decode the received information and can use the frame number (RN) contained therein to establish synchronization with the frame number in the network. However, this is problematic with handover. For example, a mobile station, e.g. B. in the GSM network befin ¬ det, measurements at, for example, the broadcast channels of cells of a UTRA TDD system (TDD: Time Division Duplex) by lead. First, only the reception power of the neighboring cells is measured to determine whether the reception of signals from the neighboring cell is better than the reception of signals from the own cell. No information is decoded on the broadcast channels (BK) because the time m is usually not sufficient to complete a time slot
Nachbarzelle zu lesen. Außerdem wird die Rahmennummer auf den Broadcastkanalen nur sehr selten ausgesendet. Eine mobile Station mußte den Broadcastkanal deshalb über einen langen Zeitraum dekodieren, um die Rahmennummer lesen zu können.Read neighboring cell. In addition, the frame number is only very rarely transmitted on the broadcast channels. A mobile station therefore had to decode the broadcast channel over a long period of time in order to be able to read the frame number.
Stellen die mobile Station oder das Netz spater fest, daß die Nachbarzelle einen besseren Empfang bietet, so wird mit einem Übergabe-Kommando eine Übergabe (Handover) eingeleitet. Dazu wird über das Netz eine Anfrage an die Nachbarzelle (NZ) gesendet. Die Nachbarzelle sendet im positiven Fall eine Uber- gabe-Anforderung (handover CMD 1) über das Netz zum GSM-System und dieses wiederum über die Luftschnittstelle zur mobilen Station. Bevor jedoch die mobile Station zur neuen Zelle wechseln kann, werden noch zwei Informationen benotigt, nämlich die relative Empfangszeit (timing advance) und die Rah- mennummer.If the mobile station or the network later determines that the neighboring cell offers better reception, a handover is initiated with a handover command. For this purpose, a request is sent to the neighboring cell (NZ) via the network. In the positive case, the neighboring cell sends a handover request (handover CMD 1) via the network to the GSM system and this in turn via the air interface to the mobile station. However, before the mobile station can switch to the new cell, two pieces of information are required, namely the relative reception time (timing advance) and the frame number.
Um die relative Empfangszeit zu bestimmen, muß die mobile Station eine Anforderung (RÄCH burst = random access burst) m einem speziellen Format über einen Kanal für zufällige bzw. unkoordimerte Zugriffe (RÄCH) oder m einem für Daten- Übertragung vorgesehenen Kanal an die Basisstation der Nachbarzelle senden, die für die weitere Kommunikation die neue Zelle werden soll. Diese Basisstation mißt den Empfangszeitpunkt dieser Anforderung und sendet über das GSM-Netz, m dem die mobile Station sich noch befindet, und die GSM-Luft- schnittsteile einen entsprechenden timing advance Wert bzw. ein entsprechendes Kommando an die mobile Station, mit der diese die spatere Übertragung in der neuen Zelle so steuern kann, daß ihre Signale zeitsynchron mit den Signalen anderer mobiler Stationen m der Basisstation der neuen Zelle em- treffen.In order to determine the relative reception time, the mobile station must make a request (RÄCH burst = random access burst) in a special format via a channel for random or uncoordinated accesses (RÄCH) or in a channel intended for data transmission to the base station of the Send neighboring cell that should become the new cell for further communication. This base station measures the time of reception of this request and transmits a corresponding timing advance value or via the GSM network, in which the mobile station is still located, and the GSM air interface parts. a corresponding command to the mobile station, with which the latter can control the later transmission in the new cell in such a way that its signals arrive at the base station of the new cell synchronously with the signals from other mobile stations.
Die Rahmennummer ist bis zu diesem Zeitpunkt jedoch noch nicht bekannt und das Lesen der Broadcastkanale der Nachbarzelle ist sehr zeitintensiv.However, the frame number is not yet known and reading the broadcast channels of the neighboring cell is very time-consuming.
In der Praxis kann die mobile Station die GSM-Verbindung lm- mer wieder für kurze Zeiträume unterbrechen, um denIn practice, the mobile station can always interrupt the GSM connection again for short periods of time
Broadcastkanal der Nachbarzelle zu dekodieren und die Rahmennummer zu lesen. Dies ist jedoch sehr zeitintensiv.Decode broadcast channel of the neighboring cell and read the frame number. However, this is very time consuming.
Der Erfindung liegt die Aufgabe zugrunde, ein verbessertes Verfahren zur Rahmensynchronisation und der Bestimmung und Übertragung des timing advance Wertes zwischen einem mobilen Endgerat und einer Sender-/Empfangerstation, insbesondere einer Basisstation bei einer Übergabe (Handover) sowie ein Funk-Kommunikationssystem zum Umsetzen des Verfahrens bereitzustellen.The invention has for its object an improved method for frame synchronization and the determination and transmission of the timing advance value between a mobile terminal and a transmitter / receiver station, in particular a base station during a handover and a radio communication system for implementing the method provide.
Diese Aufgabe wird durch das Verfahren zur Rahmensynchronisa- tion mit den Merkmalen des Anspruchs 1, das Funk-Kommunikati- onssystem mit den Merkmalen des Anspruchs 10 bzw. das mobile Endgerat nach Anspruch 13 gelost.This object is achieved by the method for frame synchronization with the features of claim 1, the radio communication system with the features of claim 10 and the mobile terminal device according to claim 13.
Vorteilhafte Weiterbildungen sind Gegenstand von abhangigen Ansprüchen.Advantageous further developments are the subject of dependent claims.
Die mobile Station weiß durch die Mitteilung, welche Rahmennummer der Rahmen hatte, m dem sie die Zugriffsanforderung an die zweite, neue Basisstation gesendet hatte. Die Synchronisation der Rahmennummer ist damit hergestellt und kann auf einfache Art und Weise aufrechterhalten werden, so daß die mobile Station zur neuen Basisstation wechseln kann, ohne auf deren Organisationskanal zeitaufwendig und unter Unterbrechung der Verbindung zur alten Basisstation nach der Rahmen¬ nummer suchen zu müssen.The message tells the mobile station which frame number the frame had when it sent the access request to the second, new base station. The synchronization of the frame number is thus established and can be maintained in a simple manner, so that the mobile station can switch to the new base station without the organization channel number having to search time consuming and interruption of the connection to the old base station to the frame ¬.
Das mobile Endgerat muß nicht mehr langwierig die Rahmennum- mer der neuen Zelle m deren Organisationskanal lesen, son¬ dern erhalt diese insbesondere ohne Zusatzaufwand über das Netz.The mobile Endgerat must no longer tedious the Rahmennum- m mer the new cell read their organization channel, son ¬ countries sustaining this particular without additional effort over the net.
Außerdem erhalt das mobile Endgerat auf die gleiche Art den timing advance Wert, den es benotigt, um m der neuen Zelle nach einem erfolgen Handover sofort Daten senden zu können. In den Fallen, m denen die Rahmennummern m alter unα neuer Zelle synchronisiert sind, wird beispielsweise nur der timing advance Wert ohne Rahmennummer zu der mobilen Station signalisiert .In addition, the mobile terminal receives the timing advance value in the same way, which it needs in order to be able to send data immediately after a handover in the new cell. In the cases in which the frame numbers m old and new cells are synchronized, for example only the timing advance value without a frame number is signaled to the mobile station.
Bei dem vorstehend beschriebenen Verfahren muß die Verbindung der mobilen Station im GSM-Netz somit vorteilhafterweise nur ein einziges Mal kurz unterbrochen werden, um die Zugriffsanforderung senden zu können.In the method described above, the connection of the mobile station in the GSM network thus advantageously only has to be briefly interrupted once in order to be able to send the access request.
Nachfolgend wird ein Ausfuhrungsbeispiel anhand αer Zeichnung naher erläutert. Es zeigen:An exemplary embodiment is explained in more detail below using the drawing. Show it:
Fig. 1 ein Blockschaltbild eines bekannten Mobilfunksystems, und Fig. 2 einen schematischen Ablaufplan eines Verfahrens zum Durchfuhren eines Handovers .Fig. 1 is a block diagram of a known mobile radio system, and Fig. 2 is a schematic flow diagram of a method for performing a handover.
Das m Fig. 1 dargestellte Mobilfunksyste als Beispiel eines bekannten Funk-Kommunikationssystems besteht aus einer Vielzahl von Netzelementen NE, insbesondere von Mobilvermittlungsstellen MSC, Einrichtungen RNM und Basisstationen BS . Die Mobilvermittlungsstellen MSC, die untereinander vernetzt sind stellen den Zugang zu einem Festnetz PSTN her. Weiterhin sind diese Mobilvermittlungsstellen MSC mit jeweils zumindest einer Einrichtung RNM zum Zuteilen von funktechnischen Ressourcen verbunden. Jede dieser Einrichtungen RNM ermöglicht wiederum eine Verbindung zu zumindest einer Basisstation BS . Eine solche Basisstation BS kann über eine Funkschnittstelle eine Verbindung zu Teilnehmerstationen, z.B. mobilen Stationen MS oder anderweitigen mobilen und stationären Endgeraten aufbauen. Durch jede Basisstation BS wird zumindest eine Funkzelle Z gebildet. Bei einer Sektorisierung oder bei hierarchischen Zellstrukturen werden pro Basisstation BS auch mehrere Funkzellen Z versorgt.The mobile radio system shown in FIG. 1 as an example of a known radio communication system consists of a multiplicity of network elements NE, in particular of mobile switching centers MSC, facilities RNM and base stations BS. The mobile switching centers MSC, which are networked with one another, provide access to a fixed network PSTN. Furthermore, these mobile switching centers are each with at least MSC connected to an RNM facility for allocating radio resources. Each of these devices RNM in turn enables a connection to at least one base station BS. Such a base station BS can establish a connection to subscriber stations, for example mobile stations MS or other mobile and stationary terminal devices, via a radio interface. At least one radio cell Z is formed by each base station BS. In the case of sectorization or hierarchical cell structures, several radio cells Z are also supplied per base station BS.
In Fig. 1 sind beispielhaft bestehende Verbindungen VI, V2, V3 zur Übertragung von Nutzinformationen und Signalisierungs- mformationen zwischen mobilen Stationen MS und einer Basis- station BS und eine Anforderung zur Ressourcenzuteilung oder eine kurze Bestatigungsmeldung m einem Zugriffskanal RÄCH durch eine weitere mobile Station MS dargestellt. Weiterhin ist ein Organisationskanal (BCCH: Broadcast Control CHannel) dargestellt, der zur Übertragung von Nutz- und Signalisie- rungsmformationen mit einer definierten Sendeleistung von jeder der Basisstationen (BS) für alle mobilen Stationen MS bereitgestellt wird.1 shows, by way of example, existing connections VI, V2, V3 for the transmission of useful information and signaling information between mobile stations MS and a base station BS and a request for resource allocation or a short confirmation message in an access channel RÄCH by another mobile station MS shown. Furthermore, an organization channel (BCCH: Broadcast Control CHannel) is shown, which is provided for the transmission of user and signaling information with a defined transmission power by each of the base stations (BS) for all mobile stations MS.
Ein Operations- und Wartungszentrum OMC realisiert Kontroll- und Wartungsfunktionen für das Mobilfunksystem bzw. für Teile davon. Die Funktionalitat dieser Struktur ist auf andere Funk-Kommunikationssysteme übertragbar, insbesondere für Teilnehmerzugangsnetze mit drahtlosem Teilnehmeranschluß .An operation and maintenance center OMC implements control and maintenance functions for the mobile radio system or for parts thereof. The functionality of this structure can be transferred to other radio communication systems, in particular for subscriber access networks with a wireless subscriber line.
Ein Ausfuhrungsbeispiel eines nachfolgend beschriebenen Uber- gabeverfahrens ist m Fig. 2 skizziert, wobei durchgezogene Linien Vorgange m der alten Zelle Z und gestrichelte Linien Vorgange m der neuen Zelle ZN darstellen. Dabei kann die neue Zelle ZN auch einem zweiten, ähnlich aufgebauten Mobil- funksystem zugeordnet sein, das z. B. über Festnetzkanale mit dem ersten verbunden ist. Bei einem einzuleitenden Übergabe- bzw. Handover-Verfahren sendet die mobile Station MS die zufällige Zugriffsanforderung RA an die neue Zelle ZN und speichert dabei oder darauf¬ hin den Zeitpunkt ab, zu dem sie gesendet hat. Danach nimmt sie den Verkehr mit der alten Basisstation BS über die alte Verbindung V3 wieder auf.An exemplary embodiment of a transfer method described below is sketched in FIG. 2, solid lines representing processes in the old cell Z and dashed lines representing processes in the new cell ZN. The new cell ZN can also be assigned to a second, similarly constructed mobile radio system which, for. B. is connected to the first via landline channels. In a handover to be initiated or handover process, the mobile station MS transmits the random access request RA to the new cell thereby ZN and stores it, or ¬ toward the instant in time at which it is sent. Then it resumes traffic with the old base station BS via the old connection V3.
Die Basisstation BSN der neuen Zelle ZN meldet m einem weiteren Schritt die Rahmennummer RN des Rahmens, m dem sie die Zugriffsanforderung RA empfangen hat, und/oder den timing advance Wert bzw. die relative Empfangszeit und evtl. anderen Meldungen m einer zweiten Ubergabeanweisung 2 bzw. einem Handover-command 2 an die mobile Station MS. Die Zusendung der zweiten Ubergabeanweisung kann direkt von der neuen Basisstation BSN oder von dieser aus über das GSM-Netz und die alte Basisstation BS an die mobile Station MS erfolgen. Die Übertragung der Informationen zur mobilen Station MS ist z.B. über eine UTRA-BTS (BTS: Basisstation), ein UTRA-Kernnetz (UTRA core network) , ein GSM-Kernnetz (GSM core network) oder die GSM-BTS möglich. Die mobile Station MS weiß dadurch, wel- ehe Rahmennummer RN der Rahmen hatte, in dem sie die Zugriffsanforderung RA an die Basisstation BSN gesendet hatte.In a further step, the base station BSN of the new cell ZN reports the frame number RN of the frame to which it has received the access request RA and / or the timing advance value or the relative reception time and possibly other messages in a second transfer instruction 2 or a handover command 2 to the mobile station MS. The second handover instruction can be sent directly from the new base station BSN or from there via the GSM network and the old base station BS to the mobile station MS. The transmission of the information to the mobile station MS is e.g. possible via a UTRA-BTS (BTS: base station), a UTRA core network (UTRA core network), a GSM core network (GSM core network) or the GSM-BTS. The mobile station MS thereby knows which frame number RN had the frame in which it had sent the access request RA to the base station BSN.
Die Synchronisation der Rahmennummer RN ist damit hergestellt und kann durch einfaches Weiterzahlen aufrechterhalten werden, so daß die mobile Station MS m einem folgenden Schritt zur neuen Basisstation BSN wechseln kann, ohne auf deren Organisationskanal BCCH zeitaufwendig und unter Unterbrechung der Verbindung zur alten Basisstation BS nach der Rahmennummer RN suchen zu müssen. Außerdem kennt die MS das timing advance und kann m der neuen Zelle sofort Daten senden. Über die neue Basisstation BSN setzt die mobile Station MS dann die Kommunikation m der neu eingerichteten Verbindung V4 fort.The synchronization of the frame number RN is thus established and can be maintained by simply continuing to pay so that the mobile station MS can switch to the new base station BSN in a subsequent step without time-consuming on its organizational channel BCCH and with the interruption of the connection to the old base station BS after the Need to search frame number RN. The MS also knows the timing advance and can immediately send data to the new cell. The mobile station MS then continues the communication m of the newly established connection V4 via the new base station BSN.
Bei dem vorstehend beschriebenen Verfahren muß die Verbindung des Endgerates, zumeist einer mobilen Station MS, im GSM-Netz somit vorteilhafterweise nur ein einziges Mal kurz unterbrochen werden, um die Zugriffsanforderung RA senden zu können.In the method described above, the connection of the terminal, usually a mobile station MS, must be in the GSM network thus advantageously only briefly interrupted once in order to be able to send the access request RA.
In einer vorteilhaften Weiterbildung des Verfahrens errechnet das Endgerat MS die Differenz der Rahmennummern der Verbin- düng V3 und der Zelle ZN und übertragt diese Differenz zu einem Netzelement. Dort wird diese Differenz zwischengespeichert und bei Bedarf an andere Endgerate gesendet, die ebenso einen Handover von Zelle Z nach Zelle ZN vorbereiten. Auf diese Weise kennen diese Endgerate bereits vorab die Rahmen- nummer m der Zelle ZN. In an advantageous development of the method, the terminal MS calculates the difference between the frame numbers of the connection V3 and the cell ZN and transmits this difference to a network element. This difference is buffered there and, if necessary, sent to other end devices, which also prepare a handover from cell Z to cell ZN. In this way, these terminal devices already know the frame number m of the cell ZN in advance.

Claims

Patentansprüche claims
1. Ubergabeverfahren m einem Funk-Kommunikationssystem bei dem eine Verbindung (V3) eines Endgerates (MS) über eine Funkschnittstelle (VI - V3 ) zu einer ersten Sender-/ Empfangerstation (BS) wahrend des Ubergabeverfahrens zu einer zweiten Sender-/ Empfangerstation (BSN) übergeben wird, dadurch gekennzeichnet, daß dem Endgerat (MS) eine aktuelle Rahmennummer (RN) und/oder ein timing advance Wert der zweiten Sen- der-/Empfangerstation (BSN) nach dem Aussenden eines Signals durch das Endgerat (MS) an die zweite Sender- /Empfangerstation (BSN) mitgeteilt wird.1. Transfer method in a radio communication system in which a connection (V3) of a terminal (MS) via a radio interface (VI - V3) to a first transmitter / receiver station (BS) during the transfer method to a second transmitter / receiver station (BSN ) is transferred, characterized in that the terminal (MS) has a current frame number (RN) and / or a timing advance value of the second transmitter / receiver station (BSN) after the terminal (MS) has sent a signal to the second transmitter / receiver station (BSN) is communicated.
2. Verfahren nach Anspruch 1, bei dem das Signal von dem Endgerat (MS) über einen Kanal für zufällige Zugriffe (RÄCH) der zweiten Sender-/ Empfangerstation (BSN) zu dieser gesendet wird.2. The method according to claim 1, wherein the signal from the terminal (MS) via a random access channel (RACH) is sent to the second transmitter / receiver station (BSN).
3. Verfahren nach Anspruch 1 oder 2, bei dem das Signal von dem Endgerat (MS) über einen Verkehrskanal zur Datenübertragung der zweiten Sender-/ Empfangerstation (BSN) zu dieser gesendet wird.3. The method according to claim 1 or 2, wherein the signal from the terminal (MS) via a traffic channel for data transmission of the second transmitter / receiver station (BSN) is sent to this.
4. Verfahren nach einem vorstehenden Anspruch, bei dem als das Signal von dem Endgerat (MS) eine zufällige Zugriffsanforderung (RA) an die zweite Sender-/ Empfangerstation (BS) gesendet wird.4. The method according to any preceding claim, in which a random access request (RA) is sent to the second transmitter / receiver station (BS) as the signal from the terminal (MS).
5. Verfahren nach einem vorstehenden Anspruch, bei dem dem Endgerat von einem Mobilfunknetzelement (NE) über die Basisstation (BS) der Zeitpunkt (ZP) für die Aussendung des Signals an die zweite zweite Sender-/Empfangerstation (BSN) vorgegeben wird.5. The method according to any preceding claim, in which the terminal from a mobile radio network element (NE) via the base station (BS) the time (ZP) for the transmission of the signal to the second second transmitter / receiver station (BSN) is specified.
6. Verfahren nach einem vorstehenden Anspruch, bei dem das Endgerat (MS) wahrend oder nach dem Senden des Signals (RA) den Sende-Zeitpunkt des Signals (RA) abspeichert. 6. The method according to any preceding claim, wherein the terminal (MS) stores the transmission time of the signal (RA) during or after the transmission of the signal (RA).
7. Verfahren nach einem vorstehenden Anspruch, be_ dem das Endgerat (MS) nach dem Senden des Signals (RA. die Kommu¬ nikation über die Verbindung (V3) mit der ersten Sender- 5 /Empfangerstation (BS) wieder bis zur Übergabe aufnimmt.7. The method according to any preceding claim be_, said Endgerat (MS) after transmitting the signal (RA. Municip ¬ nication via the connection (V3) with the first emitter 5 / recipient station (BS) resumes to the handover.
8. Verfahren nach einem vorstehenden Anspruch, bei dem das Endgerat (MS) nach dem Senden des Signals (RA) von der zweiten Sender-/Empfangerstation (BSN) den timing advance8. The method according to any preceding claim, wherein the terminal (MS) after sending the signal (RA) from the second transmitter / receiver station (BSN) the timing advance
IC Wert und/oder die Rahmennummer (RN) des Ubertragungsblocks mitgeteilt bekommt, m dem das Signal (RA) an der zweiten Sender-/Empfangerstation (BSN) empfangen wurde, oder eine zur Bestimmung der Rahmennummer (RN) erforderliche Information mitgeteilt bekommt.IC value and / or the frame number (RN) of the transmission block is communicated, m to which the signal (RA) was received at the second transmitter / receiver station (BSN), or received information required for determining the frame number (RN).
1515
9. Verfahren nach Anspruch 8, bei dem die Mitteilung der Rahmennummer (RN) und/oder des timing advance Wertes von der zweiten Sender-/ Empfangerstation (BSN) an das Endgerat (MS) direkt, über eine UTRA-Sender- C /Empfangerstation (BSN) , ein UTRA-Kernnetz, ein GSM-Kernnetz und/oder die GSM-Sender-/Empfangerstation (BS) erfolgt.9. The method of claim 8, wherein the notification of the frame number (RN) and / or the timing advance value from the second transmitter / receiver station (BSN) to the terminal (MS) directly, via a UTRA transmitter C / receiver station (BSN), a UTRA core network, a GSM core network and / or the GSM transmitter / receiver station (BS).
10. Verfahren nach Anspruch 7 oder 8, bei dem das Endgerat (MS) die Rahmennummer (RN) und/oder den timing 5 advance Wert von der zweiten Sender-/Empfangerstation (BSN) zusammen mit einer Ubergabeanweisung (CMD2) und/oder anderen Informationen über die erste Sender-/Empfangerstation (BS) mitgeteilt bekommt.10. The method according to claim 7 or 8, wherein the terminal (MS) the frame number (RN) and / or the timing 5 advance value from the second transmitter / receiver station (BSN) together with a transfer instruction (CMD2) and / or others Receives information about the first transmitter / receiver station (BS).
0 11. Verfahren nach einem der Ansprüche 8 bis 10, bei dem das Endgerat (MS) nach dem Empfang und/oder der Bestimmung der Rahmennummer (RN) und/oder des timing advance Wertes die Synchronisation und den Aufbau der Kommunikationsverbindung (V4) mit der zweiten Sender-/ Empfangerstation (BSN) durch- 5 fuhrt. 11. The method as claimed in one of claims 8 to 10, in which the terminal (MS) synchronizes and establishes the communication link (V4) after receiving and / or determining the frame number (RN) and / or the timing advance value the second transmitter / receiver station (BSN) 5.
12. Verfahren nach einem vorstehenden Anspruch, bei dem das Endgerat (MS) die Differenz der Rahmennummern m den Zellen (Z) und (ZN) der beiden Sender-/Empfangerstationen (BS, BSN) errechnet und diese Differenz (DIF) zu mindestens einem Netzelement bertragt.12. The method according to any preceding claim, in which the terminal (MS) calculates the difference of the frame numbers m the cells (Z) and (ZN) of the two transmitter / receiver stations (BS, BSN) and this difference (DIF) to at least one Network element transmitted.
13. Verfahren nach einem vorstehenden Anspruch, bei dem ein Mobilfunknetzelement (NE) die Differenz zwischen dem Zeitpunkt (ZP) und der Rahmennummer (RN) errechnet.13. The method according to any preceding claim, in which a mobile radio network element (NE) calculates the difference between the point in time (ZP) and the frame number (RN).
I CI C
14. Verfahren nach einem vorstehenden Anspruch, bei dem die Differenz (DIF) m einem Netzelement (NE) mindestens eines beteiligten Mobilfunknetzes gespeichert und an andere Endgerate (MS) übermittelt wird. 1514. The method as claimed in claim 1, in which the difference (DIF) is stored in a network element (NE) of at least one mobile radio network involved and is transmitted to other terminal devices (MS). 15
15. Funk-Kommunikationssystem, mir15. Radio communication system, mine
- zumindest einem Endgerat (MS) und- At least one terminal (MS) and
- einer Vielzahl von Sender-/Empfangerstationen (BS, BSN) und- A variety of transmitter / receiver stations (BS, BSN) and
- einer Einrichtung zum sender-/empfangerstationsseitigen Be- 0 stimmen einer aktuellen Rahmennummer (RN) und/oder eines aktuellen timing advance Wertes einer zweiten Sender-a device for determining a current frame number (RN) and / or a current timing advance value of a second transmitter on the transmitter / receiver station side.
/Empfangerstation (BSN) , falls zumindest eines von Endgeraten (MS) von einer bestehenden Funkverbindung (V3) mit einer ersten Sender-/Empfangerstation (BS) zu einer Verbindung (V4) 5 mit der zweiten Sender-/Empfangerstation (BSN) wechseln soll./ Receiver station (BSN) if at least one of terminals (MS) is to change from an existing radio connection (V3) with a first transmitter / receiver station (BS) to a connection (V4) 5 with the second transmitter / receiver station (BSN) ,
16. Funk-Kommunikationssystem nach Anspruch 15, das zumindest eine Einrichtung zum Übermitteln der bestimmten Rahmennummer (RN) und/oder des timing advance Wertes an das C Endgerat (MS) aufweist.16. Radio communication system according to claim 15, which has at least one device for transmitting the determined frame number (RN) and / or the timing advance value to the C terminal (MS).
17. Verfahren nach einem der Ansprüche 1 bis 14 bzw. Funk- Kommunikationssystem nach Anspruch 15 oder 16, bei dem die Sender-/Empfangerstatιonen Basisstationen (BS) sind. 5 17. The method according to any one of claims 1 to 14 or radio communication system according to claim 15 or 16, in which the transmitter / receiver stations are base stations (BS). 5
18. Endgerat für ein Kommunikationssystem nach Anspruch 15 oder 16 und/oder zum Durchfuhren eines Verfahrens nach einem der Ansprüche 1 - 14. 18. Terminal for a communication system according to claim 15 or 16 and / or for performing a method according to one of claims 1-14.
PCT/DE2000/004606 1999-12-22 2000-12-21 Frame synchronisation between a mobile station and a base station during handover WO2001047289A2 (en)

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DE19962264A DE19962264A1 (en) 1999-12-22 1999-12-22 Method for frame synchronization between a terminal and a base station in connection forwarding in a radio communication system

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WO2013055338A1 (en) * 2011-10-13 2013-04-18 Qualcomm Incorporated Improved inter-rat measurements using timing offset
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