WO2004086785A2 - Method for receiving and transmitting a broadcast or multicast service in a radio communications system - Google Patents

Method for receiving and transmitting a broadcast or multicast service in a radio communications system Download PDF

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Publication number
WO2004086785A2
WO2004086785A2 PCT/EP2004/001937 EP2004001937W WO2004086785A2 WO 2004086785 A2 WO2004086785 A2 WO 2004086785A2 EP 2004001937 W EP2004001937 W EP 2004001937W WO 2004086785 A2 WO2004086785 A2 WO 2004086785A2
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WO
WIPO (PCT)
Prior art keywords
information
broadcast
multicast service
bms
channel
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PCT/EP2004/001937
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German (de)
French (fr)
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WO2004086785A3 (en
Inventor
Norbert Kroth
Jörg Schniedenharn
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Siemens Aktiengesellschaft
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Publication of WO2004086785A2 publication Critical patent/WO2004086785A2/en
Publication of WO2004086785A3 publication Critical patent/WO2004086785A3/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/2854—Wide area networks, e.g. public data networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/30—Resource management for broadcast services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information

Definitions

  • the invention relates to a method for receiving and a method for transmitting a broadcast or multicast service in a radio communication system, as well as a corresponding receiving station and a corresponding transmitting station.
  • the 3GPP (3rd Generation Partnership Program) currently specifies procedures to send the same data to many users. This standardization work is dealt with under the term Multimedia Broadcast Multicast Service (MBMS).
  • MBMS Multimedia Broadcast Multicast Service
  • Broadcast services are services that are transmitted from a transmitting station to all stations that are within the radio range of the transmitting station.
  • the sending station sends data that can be used by all accessible stations. This includes, among other things, information about the spread codes to be used in a radio cell of a cellular radio system with CDMA multiplex component (CDMA: Code Division Multiple Access) or about the transmission power to be selected by mobile stations.
  • CDMA Code Division Multiple Access
  • Multicast services are transmitted simultaneously from one transmitting station to all stations in a multicast group to be defined before the signal transmission.
  • the data transmitted in this way is only received by a certain group of accessible stations.
  • multicast services can be used to selectively supply selected stations with new software (software download).
  • the data transmitted using broadcast or multicast services can contain both useful data and signaling data. hold and their transmission can take place with different data rates.
  • Service with a low data rate (e.g. 32 kbps) can be provided, which is transmitted over a channel of the radio network.
  • the service is multiplexed in the core network (e.g. CBC Common Broadcast Channel) on the basis of message type identifiers.
  • the radio resource which is used for the broadcast service is known to the subscriber station by reading the cell information which is transmitted to all subscriber stations as broadcast information in the entire radio cell.
  • the different MBMS services are provided by the core network as separate data streams.
  • the radio network is expected to multiplex the data on one or more radio channels.
  • the invention is therefore based on the object of specifying a method which enables the reception and transmission of MBMS services with high data rates with dynamic allocation of radio resources.
  • a receiving station in the control channel receives first information about the broadcast or multicast service
  • the receiving station receives second information about the in the broadcast channel Broadcast or multicast service
  • the receiving station receives the broadcast or multicast service using the two pieces of information.
  • the information required to receive the service can be distributed over both channels in such a way that the channel with the largest transmission capacity and / or the channel which causes the least interference carries the most information.
  • the information required for receiving the broadcast or multicast service can be transmitted separately from the data of the broadcast or multicast service. This enables high data rates and dynamic allocation of radio resources by means of the first and / or second information received independently of the data.
  • the first information contains a request to receive the second information.
  • the receiving station can thus receive a broadcast or multicast service which, for example, only requires first information at a first point in time in order to be received.
  • the first information contains a request to receive the second information in the broadcast channel.
  • the total information required to receive the broadcast multicast service can be distributed dynamically between the first and second information and the reception of the first and second information can also be controlled dynamically by the content of the first information. It is particularly advantageous if the first information states whether the second information has changed compared to an earlier transmission.
  • the second information can contain information that is required to receive the broadcast or multicast service, but remains constant over a certain period of time.
  • the receiving station receives both the first and the second information once, receives first information in the control channel during the broadcast or multicast service and only receives second information again in the broadcast channel if there is changed them since the last reception.
  • the receiving station receives cell information in the broadcast channel about at least the radio cell in which the receiving station is located.
  • a broadcast channel (BCCH: Broadcast Control Channel) is transmitted regularly in each radio cell, so that no additional broadcast channel is required to carry out the method according to the invention.
  • BCCH Broadcast Control Channel
  • Such a broadcast channel can be read automatically by each receiving station that is moving into a new radio cell, so that a receiving station can automatically receive the second information.
  • the receiving station first receives the cell information, then the first information and finally the second information.
  • a sending station in the control channel sends first information about the broadcast or multicast service, the sending station sends second information about the broadcast or multicast service in the broadcast channel and the sending station sends the broadcast or multicast service using the two information.
  • the receiving station and the transmitting station according to the invention have all the means for carrying out the corresponding methods.
  • Fig. 1 shows an embodiment of a radio communication system according to the invention
  • FIG. 2 shows an exemplary embodiment of a sequence according to the invention for receiving or sending a
  • a mobile station is considered below as the receiving station.
  • a mobile station for example, a mobile phone or a portable devices for over ⁇ transmission of video and / or sound data, for fax, short message service SMS and E-mails and Internet access. It is therefore a general transmission and / or reception unit of a radio communication system.
  • the invention can advantageously be used in any radio communication system.
  • Radio communication systems are any systems in which data is transmitted between stations via a radio interface. The data transmission can take place bidirectionally as well as unidirectionally.
  • Radio communication systems are in particular any mobile radio system, for example according to the GSM (Global System for Mobile Communications) or UMTS (Universal Mobile Telecommunications System) standard. Future mobile radio systems of the 4th generation, for example, are also to be understood as radio communication systems.
  • the invention is described below using the example of a mobile radio system according to the UMTS standard, but without being restricted thereto.
  • FIG. 1 schematically shows a radio access network UTRAN with a radio access controller RNC and a base station BS with a transmitting device S and four mobile stations MSI, MS2, MS3, MS4.
  • the mobile stations MSI, MS2, MS3, MS4 each have a transmitting and receiving device SE.
  • the mobile stations MSI, MS2, MS3, MS4 receive cell information ZI about the radio cell Z in which the mobile stations MSI, MS2, MS3, MS4 are located.
  • the cell information ZI contains all information that the mobile stations MSI, MS2, MS3, MS4 need in order to be able to use radio connections in the radio cell Z.
  • the cell information ZI provides information about the radio resources used by channels used in the radio cell Z.
  • the cell information ZI gives the mobile stations MSI, MS2, MS3, MS4, for example, information about the spreading code used by a control channel MCCH, which is used to receive first information II via a broadcast or multicast service BMS.
  • Three mobile stations MSI, MS2, MS3 are assigned to the broadcast or multicast service BMS, ie want to receive this service BMS or are provided for reception from another side, for example from the radio access network UTRAN.
  • the fourth mobile station MS4 does not receive the broadcast or multicast service BMS but only the cell information ZI and second information 12.
  • the three mobile stations MSI, MS2, MS3 are able to receive first information II, which are transmitted on the control channel MCCH.
  • the mobile stations require the first information II in order to receive the broadcast or multicast service BMS on a common traffic channel MTCH.
  • the cell information ZI - preferably integrated into the same hierarchical structure that is also used by the cell information ZI - all mobile stations MSI, MS2, MS3, MS4 receive the second information 12 from the radio access network UTRAN via the broadcast channel BCCH
  • Information 12 is required by the three mobile stations MSI, MS2, MS3 in addition to the first information II in order to receive the broadcast multicast service BMS.
  • the second information 12 has no function for the fourth mobile station MS4 as long as it does not want to receive the broadcast or multicast service BMS.
  • the evaluation of both the first and the second information II, 12 enables the three mobile stations MSI, MS2, MS3 to receive the broadcast or multicast service BMS. While the broadcast or multicast service is being received, the first and second information II, 12 are repeated periodically. During the reception of the broadcast or multicast service BMS, the three mobile stations MSI, MS2, MS3 repeatedly receive the first information II on the control channel MCCH.
  • the first information II contains all information about the reception of the broadcast or multicast service that changes frequently or has little signaling effort require.
  • the second information 12 is the information that changes relatively rarely or requires a high signaling effort. The second information 12 is not critical for an optimal transmission of the broadcast or multicast service BMS and must therefore be received less frequently than the first information II.
  • the second information 12 is therefore only received if it has changed compared to an earlier reception.
  • the first information II contains a request that the second information 12 must be received again in the broadcast channel BCCH. Only when the three mobile stations MSI, MS2, MS3 receive this request do they receive the second information 12. This ensures that the three mobile stations MSI, MS2, MS3 only receive and evaluate the information that they need for continuous and perfect reception of the broadcast or multicast service BMS.
  • the first information II contains only a request to receive the second information and no further data. In extreme cases, the first information II is then represented by only 1 bit. The first information II is not sent at all if the second information has not changed since an earlier request to receive it.
  • the three mobile stations MSI, MS2, MS3 then only listen to the control channel during reception of the broadcast or multicast service and wait for first information II. The first information II caused by this on the control channel MCCH can therefore cause interference Minimum be reduced because the first information II can have only a few bits.
  • the second information 12 transmitted on the broadcast channel in any case does not represent any additional load on the radio transmissions in the radio cell Z (for example with regard to interference) since the Broadcast channel due to the sent by him cell Informa ⁇ ZI functions anyway periodically send information needs.
  • the second information 12 can be easily integrated into the known hierarchical structure of the cell information ZI without the transmission of the cell information ZI being impaired.
  • first and second information items II, 12 contain, for example, the following information familiar to the person skilled in the art:
  • Radio resource control RRC connection establishment indication
  • probability factor probability factor
  • type of service transmission beamforming factor
  • configuration of the radio connection radio configuration (and / or Identity)
  • the configuration of the radio connection includes, for example:
  • first and / or second information II, 12 can contain information about broadcast or multicast services of neighboring radio cells.
  • control channel MCCH is, for example, a group control channel, i. H. a control channel that transmits information for certain groups of mobile stations, the groups of mobile stations being assigned to one or more broadcast or multicast services.
  • First and second information, which are assigned to different broadcast or multicast services, are each identified by a service identification parameter during transmission on the group channel.
  • Each mobile station knows the service identification parameters of the broadcast or multicast services that the mobile station receives (its group) and therefore only receives in the group channel the information assigned to the respective broadcast or multicast services.
  • FIG. 2 schematically shows a sequence of information transmissions that enable a mobile station MSI to receive a broadcast or multicast service BMS.
  • the mobile station MSI When entering a new radio cell Z, the mobile station MSI first receives cell information ZI and second information 12 via a broadcast channel BCCH of a radio access network UTRAN. On the basis of the second information 12 assigned to a broadcast or multicast service BMS, the Mobile station that the broadcast or multicast service BMS is offered in this radio cell Z. On the basis of the cell information ZI, the mobile station MSI knows a control channel MCCH which provides it with the first information II which it needs to receive the broadcast or multicast service BMS.
  • the mobile station receives the first information II and evaluates it.
  • the mobile station MSI finds the time at which the broadcast or multicast service BMS starts, as well as the request to receive second information 12 on the broadcast channel BCCH before the start of the broadcast or multicast service.
  • the mobile station MSI receives again on the broadcast channel BCCH and, in addition to the cell information ZI, also receives the second information 12.
  • the mobile station MSI evaluates the second information 12 and then receives on a common traffic channel MTCH at the time specified in the first information II the broadcast or multicast service BMS.
  • the mobile station MSI has taken the radio resources of the common traffic channel MTCH from the second information 12.
  • the mobile station MSI then continuously receives the broadcast or multicast service BMS.
  • the mobile station MSI constantly checks whether further first information II is transmitted on the control channel MCCH. After a time interval ⁇ T, the mobile station MSI finally receives further first information II, which prompts it to receive the second information 12 again, since these have meanwhile changed compared to the first reception.
  • the mobile station MSI then again receives the second information 12 in the broadcast channel BCCH and at the same time the cell information ZI. On the basis of the updated second information 12, the mobile station MSI is still able to optimally receive the broadcast or multicast service BMS.
  • the method according to the invention makes it possible to transmit a large part or even all of the control information required for a broadcast or multicast service in the form of the second information 12 in a broadcast channel BCCH. It is therefore sufficient that the control channel MCCH contains a request to receive the second information 12 in the first information II. Because only a minimal additional signaling effort compared to existing mobile radio systems in the form of the request on the control channel is required, only minor additional interferences occur due to the additional control channel.
  • the broadcast channel is transmitted exactly as in previous mobile radio systems, but expanded by the second information 12. The transmission of the second information 12 therefore does not require any additional radio resources.
  • a mobile station MSI enters a radio cell while the transmission of a broadcast or multicast service is already running, this mobile station automatically reads the cell information ZI and the second information 12 on the broadcast channel BCCH when it enters the radio cell. Based on the second information 12, the mobile station learns whether it needs a point-to-point connection to receive the service because, for example, only a few mobile stations receive the service, or whether it is using a point-to-multipoint connection on a common one MTCH traffic channel required. After receiving the broadcast or multicast service, the mobile station that is added to the service later behaves like the other mobile stations that have already received the broadcast or multicast service, ie the mobile station may now also use the control channel MCCH.
  • the mobile station automatically first receives the cell information and, based on the second information it contains, immediately learns how it can continue to receive a service that it has already received in the old radio cell, or whether the service in the new radio cell is offered at all. If the service is not offered, the mobile station can receive a warning and, in the case of soft handovers, even a return to the old radio cell or a change to a radio cell that offers this service can be initiated (for example by the user or an automatic control or steering system of the mobile station).

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

Abstract

In a method for receiving a broadcast or multicast service (BMS) in a radio communications system having a broadcast channel (BCCH) as well as a control channel (MCCH), a station (MS1, MS2, MS3), in the control channel (MCCH), receives first items of information (I1) concerning the broadcast or multicast service (BMS). In the broadcast channel (BCCH), the station (MS1, MS2, MS3) additionally receives second items of information (I2) concerning the broadcast or multicast service (BMS) and finally receives the broadcast or multicast service (BMS) while using both first and second items of information (I1, I2).

Description

Beschreibungdescription
Verfahren zum Empfang und Verfahren zum Senden eines Broadcast- oder Multicast-Dienstes in einem Funkkom unikationssys- tem sowie Empfangsstation und SendestationMethod for receiving and method for sending a broadcast or multicast service in a radio communication system as well as receiving station and transmitting station
Die Erfindung betrifft ein Verfahren zum Empfang und ein Verfahren zum Senden eines Broadcast- oder Multicast-Dienstes in einem Funkkommunikationssystem sowie eine entsprechende Emp- fangsstation und eine entsprechende Sendestation.The invention relates to a method for receiving and a method for transmitting a broadcast or multicast service in a radio communication system, as well as a corresponding receiving station and a corresponding transmitting station.
In der 3GPP (3rd Generation Partnership Program) werden momentan Verfahren spezifiziert, um die gleichen Daten an viele Benutzer zu senden. Diese Arbeit in der Standardisierung wird unter dem Begriff Multimedia Broadcast Multicast Service (MBMS) bearbeitet.The 3GPP (3rd Generation Partnership Program) currently specifies procedures to send the same data to many users. This standardization work is dealt with under the term Multimedia Broadcast Multicast Service (MBMS).
Broadcast-Dienste sind Dienste, die von einer Sendestation an alle Stationen übertragen werden, die sich in Funkreichweite der Sendestation befinden. Die Sendestation sendet Daten, die von allen erreichbaren Stationen genutzt werden können. Hierzu gehören unter anderem Informationen über zu verwendende Spreizcodes in einer Funkzelle eines zellularen Funksystems mit CDMA-Multiplex-Ko ponente (CDMA: Code Division Multiple Access) oder über die Sendeleistung, die von Mobilstationen zu wählen ist.Broadcast services are services that are transmitted from a transmitting station to all stations that are within the radio range of the transmitting station. The sending station sends data that can be used by all accessible stations. This includes, among other things, information about the spread codes to be used in a radio cell of a cellular radio system with CDMA multiplex component (CDMA: Code Division Multiple Access) or about the transmission power to be selected by mobile stations.
Multicast-Dienste hingegen werden von einer Sendestation an alle Stationen einer vor der Signalübertragung festzulegenden Multicast-Gruppe gleichzeitig übertragen. Die so übertragenen Daten werden nur von einer bestimmten Gruppe der erreichbaren Stationen empfangen. Beispielsweise können mit Multicast- Diensten gezielt ausgewählte Stationen mit neuer Software versorgt werden (Software download) .Multicast services, on the other hand, are transmitted simultaneously from one transmitting station to all stations in a multicast group to be defined before the signal transmission. The data transmitted in this way is only received by a certain group of accessible stations. For example, multicast services can be used to selectively supply selected stations with new software (software download).
Die mittels Broadcast- oder Multicast-Diensten übertragenen Daten können sowohl Nutz- als auch Signalisierungsdaten ent- halten und ihre Übertragung kann mit unterschiedlichen Datenraten erfolgen.The data transmitted using broadcast or multicast services can contain both useful data and signaling data. hold and their transmission can take place with different data rates.
In gegenwärtigen mobilen Funknetzen (z.B. UTRAN: Universal Terrestrial Radio Access Network) kann nur ein Broadcast-In current mobile radio networks (e.g. UTRAN: Universal Terrestrial Radio Access Network) only one broadcast
Dienst mit einer geringen Datenrate (z.B. 32 kbps) bereitgestellt werden, der über einen Kanal des Funknetzes übertragen wird. Das Multiplexen des Dienstes erfolgt im Kernnetz (z.B. CBC Common Broadcast Channel) auf der Basis von Nachrichten- typ-Identifizierern. Die Funkressource, die für den Broad- cast-Dienst genutzt wird, ist dabei der Teilnehmerstation bekannt durch das Lesen der Zellinformationen, die in der ganzen Funkzelle allen Teilnehmerstationen als Broadcastinforma- tion übermittelt werden.Service with a low data rate (e.g. 32 kbps) can be provided, which is transmitted over a channel of the radio network. The service is multiplexed in the core network (e.g. CBC Common Broadcast Channel) on the basis of message type identifiers. The radio resource which is used for the broadcast service is known to the subscriber station by reading the cell information which is transmitted to all subscriber stations as broadcast information in the entire radio cell.
Es werden nunmehr neue Anforderungen an die Netzwerke gestellt, die vor allem hohe Datenraten (> 64 kbps) und eine dynamische Zuweisung der Funknetzressourcen an einzelne Broadcast- und/oder Multicast-Dienste ermöglichen sollen. Es sollten auch parallel unterschiedliche MultimediadiensteNew demands are now being made on the networks, which above all should enable high data rates (> 64 kbps) and dynamic allocation of the radio network resources to individual broadcast and / or multicast services. Different multimedia services should also be used in parallel
(Text, Audio, Video, usw.) zu den Teilnehmern in Punkt-zu- Mehrpunkt-Verbindungen übertragen werden. Die unterschiedlichen MBMS-Dienste werden vom Kernnetz als separate Datenströme bereitgestellt. Es wird erwartet, dass das Funknetz die Daten auf einem oder auf mehrere Funkkanäle multiplext.(Text, audio, video, etc.) are transmitted to the participants in point-to-multipoint connections. The different MBMS services are provided by the core network as separate data streams. The radio network is expected to multiplex the data on one or more radio channels.
Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren anzugeben, das den Empfang und das Senden von MBMS-Diensten mit hohen Datenraten bei dynamischer Zuweisung von Funkres- sourcen ermöglicht.The invention is therefore based on the object of specifying a method which enables the reception and transmission of MBMS services with high data rates with dynamic allocation of radio resources.
Diese Aufgabe wird mit den Verfahren, der Empfangsstation sowie der Sendestation gemäß den unabhängigen Ansprüchen gelöst .This object is achieved with the method, the receiving station and the transmitting station according to the independent claims.
Vorteilhafte Aus- und Weiterbildungen der Erfindung sind Gegenstand der abhängigen Ansprüche. In dem erfindungsgemäßen Verfahren zum Empfang eines Broadcast- oder Multicast-Dienstes in einem Funkkommunikationssystem mit einem Rundsendekanal und einem Kontrollkanal empfängt eine Empf ngsstation in dem Kontrollkanal erste Informationen über den Broadcast- oder Multicast-Dienst, empfängt die Empfangsstation in dem Rundsendekanal zweite Informationen über den Broadcast- oder Multicast-Dienst und empfängt die Empfangsstation den Broadcast- oder Multicast-Dienst unter Ver- wendung der beiden Informationen. Auf diese Weise können die für einen Empfang des Dienstes benötigten Informationen so auf beide Kanäle verteilt werden, dass der Kanal mit der größeren Übertragungskapazität und/oder der Kanal, der die geringsten Interferenzen verursacht, die meisten Informationen trägt. Weiterhin können die Informationen, die für den Empfang des Broadcast- oder Multicast-Dienstes benötigt werden, separat von den Daten des Broadcast- oder Multicast-Dienstes übertragen werden. Dies ermöglicht hohe Datenraten und eine dynamische Zuweisung von Funkressourcen mittels der unabhän- gig von den Daten empfangenen ersten und/oder zweiten Informationen.Advantageous further developments of the invention are the subject of the dependent claims. In the method according to the invention for receiving a broadcast or multicast service in a radio communication system with a broadcast channel and a control channel, a receiving station in the control channel receives first information about the broadcast or multicast service, the receiving station receives second information about the in the broadcast channel Broadcast or multicast service and the receiving station receives the broadcast or multicast service using the two pieces of information. In this way, the information required to receive the service can be distributed over both channels in such a way that the channel with the largest transmission capacity and / or the channel which causes the least interference carries the most information. Furthermore, the information required for receiving the broadcast or multicast service can be transmitted separately from the data of the broadcast or multicast service. This enables high data rates and dynamic allocation of radio resources by means of the first and / or second information received independently of the data.
Von Vorteil ist es, wenn die ersten Informationen eine Aufforderung zum Empfang der zweiten Informationen enthalten. Die Empfangsstation kann so einen Broadcast- oder Multicast- Dienst empfangen, der beispielsweise zu einem ersten Zeitpunkt nur erste Informationen benötigt, um empfangen zu werden. Um Ressourcen zu sparen, oder falls zu einem zweiten Zeitpunkt beispielsweise die Übertragungskapazitäten des Kon- trollkanals nicht ausreichen, ist in den ersten Informationen eine Aufforderung zum Empfang der zweiten Informationen in dem Rundsendekanal enthalten. Die insgesamt zum Empfang des Broadcast- Multicast-Dienstes benötigten Informationen können dynamisch auf die ersten und zweiten Informationen verteilt werden und der Empfang der ersten und zweiten Informationen kann ebenfalls dynamisch durch den Inhalt der ersten Informationen gesteuert werden. Besonders vorteilhaft ist es, wenn die ersten Informationen aussagen, ob sich die zweiten Informationen gegenüber einer früheren Aussendung geändert haben. Die zweiten Informationen können in dieser Ausgestaltung der Erfindung Informationen enthalten, die zum Empfang des Broadcast- oder Multicast- Dienstes benötigt werden, aber über einen bestimmten Zeitraum konstant bleiben. Die Empfangsstation empfängt vor dem Beginn des Broadcast- oder Multicast-Dienstes einmal sowohl die ers- ten als auch die zweiten Informationen, empfängt während des Broadcast- oder Multicast-Dienstes erste Informationen im Kontrollkanal und empfängt nur dann erneut zweite Informationen im Rundsendekanal, wenn sich diese seit dem letzten Empfang geändert haben.It is advantageous if the first information contains a request to receive the second information. The receiving station can thus receive a broadcast or multicast service which, for example, only requires first information at a first point in time in order to be received. In order to save resources, or if, for example, the transmission capacities of the control channel are insufficient at a second point in time, the first information contains a request to receive the second information in the broadcast channel. The total information required to receive the broadcast multicast service can be distributed dynamically between the first and second information and the reception of the first and second information can also be controlled dynamically by the content of the first information. It is particularly advantageous if the first information states whether the second information has changed compared to an earlier transmission. In this embodiment of the invention, the second information can contain information that is required to receive the broadcast or multicast service, but remains constant over a certain period of time. Before the broadcast or multicast service begins, the receiving station receives both the first and the second information once, receives first information in the control channel during the broadcast or multicast service and only receives second information again in the broadcast channel if there is changed them since the last reception.
Zweckmäßig ist es daher, wenn die ersten und/oder die zweiten Informationen periodisch übertragen werden.It is therefore expedient if the first and / or the second information is transmitted periodically.
Höchst vorteilhaft ist es, wenn die Empfangsstation in dem Rundsendekanal Zellinformationen über wenigstens die Funkzelle empfängt, in der sich die Empfangsstation befindet. Ein derartiger Rundsendekanal (BCCH: Broadcast Control Channel) wird regelmäßig in jeder Funkzelle ausgesendet, so dass zur Durchführung des erfindungsgemäßen Verfahrens kein zusätzli- eher Rundsendekanal benötigt wird. Insbesondere kann ein solcher Rundsendekanal von jeder Empfangsstation, die sich in eine neue Funkzelle bewegt, automatisch gelesen werden, so dass eine Empfangsstation die zweiten Informationen automatisch empfangen kann.It is highly advantageous if the receiving station receives cell information in the broadcast channel about at least the radio cell in which the receiving station is located. Such a broadcast channel (BCCH: Broadcast Control Channel) is transmitted regularly in each radio cell, so that no additional broadcast channel is required to carry out the method according to the invention. In particular, such a broadcast channel can be read automatically by each receiving station that is moving into a new radio cell, so that a receiving station can automatically receive the second information.
Von Vorteil ist auch, wenn die Empfangstation zunächst die Zellinformationen, danach die ersten Informationen und zuletzt die zweiten Informationen empfängt.It is also advantageous if the receiving station first receives the cell information, then the first information and finally the second information.
In dem erfindungsgemäßen Verfahren zum Senden eines Broadcast- oder Multicast-Dienstes in einem Funkkommunikationssystem mit einem Rundsendekanal und einem Kontrollkanal, sendet eine Sendestation in dem Kontrollkanal erste Informationen über den Broadcast- oder Multicast-Dienst, sendet die Sendestation in dem Rundsendekanal zweite Informationen über den Broadcast- oder Multicast-Dienst und sendet die Sendestation den Broadcast- oder Multicast-Dienst unter Verwendung der beiden Informationen.In the method according to the invention for transmitting a broadcast or multicast service in a radio communication system with a broadcast channel and a control channel a sending station in the control channel sends first information about the broadcast or multicast service, the sending station sends second information about the broadcast or multicast service in the broadcast channel and the sending station sends the broadcast or multicast service using the two information.
Weiterbildungen des Sendeverfahrens entsprechen den Weiterbildungen des Empfangsverfahrens.Further developments in the transmission process correspond to the further developments in the reception process.
Die erfindungsgemäße Empfangsstation und die erfindungsgemäße Sendestation weisen alle Mittel zur Durchführung der entsprechenden Verfahren auf.The receiving station and the transmitting station according to the invention have all the means for carrying out the corresponding methods.
Die Erfindung wird im folgenden anhand von in den Figuren dargestellten Ausführungsbeispielen näher erläutert.The invention is explained in more detail below with reference to exemplary embodiments shown in the figures.
Es zeigen:Show it:
Fig. 1 ein Ausführungsbeispiel eines erfindungsgemäßen Funkkommunikationssystems undFig. 1 shows an embodiment of a radio communication system according to the invention and
Fig. 2 ein Ausführungsbeispiel zu einem erfindungsge- mäßen Ablauf zum Empfang bzw. Senden eines2 shows an exemplary embodiment of a sequence according to the invention for receiving or sending a
Broadcast- oder Multicast-Dienstes.Broadcast or multicast service.
Gleiche Bezugszeichen in den Figuren bezeichnen gleiche Gegenstände .The same reference symbols in the figures denote the same objects.
Als Empfangsstation wird im nachfolgenden eine Mobilstation betrachtet. Eine Mobilstation ist beispielsweise ein Mobiltelefon oder auch eine ortsbewegliche Vorrichtungen zur Über¬ tragung von Bild- und/oder Tondaten, zum Fax-, Short Message Service SMS- und eMail-Versand und zum Internet-Zugang. Es handelt sich mithin um eine allgemeine Sende- und/oder Emp- fangseinheit eines Funkkom unikationssystems . Die Erfindung kann vorteilhaft in beliebigen Funkkommunikationssystemen verwendet werden. Unter Funkkommunikationssystemen sind beliebige Systeme zu verstehen, in denen eine Daten- Übertragung zwischen Stationen über eine Funkschnittstelle erfolgt. Die Datenübertragung kann sowohl bidirektional als auch unidirektional erfolgen. Funkkommunikationssysteme sind insbesondere beliebige Mobilfunksysteme beispielsweise nach dem GSM- (Global System for Mobile Communications) oder dem UMTS- (Universal Mobile Telecommunications System) Standard. Auch zukünftige Mobilfunksysteme beispielsweise der 4. Generation sollen unter Funkkommunikationssystemen verstanden werden.A mobile station is considered below as the receiving station. A mobile station, for example, a mobile phone or a portable devices for over ¬ transmission of video and / or sound data, for fax, short message service SMS and E-mails and Internet access. It is therefore a general transmission and / or reception unit of a radio communication system. The invention can advantageously be used in any radio communication system. Radio communication systems are any systems in which data is transmitted between stations via a radio interface. The data transmission can take place bidirectionally as well as unidirectionally. Radio communication systems are in particular any mobile radio system, for example according to the GSM (Global System for Mobile Communications) or UMTS (Universal Mobile Telecommunications System) standard. Future mobile radio systems of the 4th generation, for example, are also to be understood as radio communication systems.
Im folgenden wird die Erfindung am Beispiel eines Mobilfunksystems nach dem UMTS-Standard beschrieben, ohne jedoch darauf beschränkt zu sein.The invention is described below using the example of a mobile radio system according to the UMTS standard, but without being restricted thereto.
In Figur 1 sind schematisch ein Funkzugangsnetz UTRAN mit ei- nem Funkzugangskontroller RNC und einer Basisstation BS mit einer Sendeeinrichtung S sowie vier Mobilstationen MSI, MS2, MS3, MS4 dargestellt. Die Mobilstationen MSI, MS2, MS3, MS4 weisen jeweils eine Sende- und Empfangseinrichtung SE auf. Über einen Rundsendekanal BCCH erhalten die Mobilstationen MSI, MS2, MS3, MS4 Zellinformationen ZI über die Funkzelle Z in der sich die Mobilstationen MSI, MS2, MS3, MS4 aufhalten. Die Zellinformationen ZI beinhalten alle Informationen, die die Mobilstationen MSI, MS2, MS3, MS4 benötigen, um in der Funkelle Z Funkverbindungen verwenden zu können. Beispiels- weise informieren die Zellinformationen ZI über die verwendeten Funkressourcen von in der Funkzelle Z verwendeten Kanälen. Die Mobilstationen MSI, MS2, MS3, MS4 erhalten durch die Zellinformationen ZI beispielsweise eine Information über den Spreizcode, den ein Kontrollkanal MCCH verwendet, der zum Empfang von ersten Informationen II über einen Broadcast- o- der Multicast-Dienst BMS dient. Drei Mobilstationen MSI, MS2, MS3 sind dem Broadcast- oder Multicast-Dienst BMS zugeordnet, d. h. wollen diesen Dienst BMS empfangen oder sind von anderer Seite, beispielsweise vom Funkzugangsnetz UTRAN, zum Empfang vorgesehen. Die vierte Mo- bilstation MS4 empfängt den Broadcast- oder Multicast-Dienst BMS nicht sondern ausschließlich die Zellinformationen ZI sowie zweite Informationen 12.1 schematically shows a radio access network UTRAN with a radio access controller RNC and a base station BS with a transmitting device S and four mobile stations MSI, MS2, MS3, MS4. The mobile stations MSI, MS2, MS3, MS4 each have a transmitting and receiving device SE. Via a broadcast channel BCCH, the mobile stations MSI, MS2, MS3, MS4 receive cell information ZI about the radio cell Z in which the mobile stations MSI, MS2, MS3, MS4 are located. The cell information ZI contains all information that the mobile stations MSI, MS2, MS3, MS4 need in order to be able to use radio connections in the radio cell Z. For example, the cell information ZI provides information about the radio resources used by channels used in the radio cell Z. The cell information ZI gives the mobile stations MSI, MS2, MS3, MS4, for example, information about the spreading code used by a control channel MCCH, which is used to receive first information II via a broadcast or multicast service BMS. Three mobile stations MSI, MS2, MS3 are assigned to the broadcast or multicast service BMS, ie want to receive this service BMS or are provided for reception from another side, for example from the radio access network UTRAN. The fourth mobile station MS4 does not receive the broadcast or multicast service BMS but only the cell information ZI and second information 12.
Aufgrund der Zellinformation ZI sind die drei Mobilstationen MSI, MS2, MS3 in der Lage erste Informationen II, die auf dem Kontrollkanal MCCH übertragen werden, zu empfangen. Die ersten Informationen II benötigen die Mobilstationen, um den Broadcast- oder Multicast-Dienst BMS auf einem gemeinsamen Verkehrskanal MTCH zu empfangen. Zusätzlich zu den Zellinfor- mationen ZI - bevorzugt integriert in die gleiche hierarchische Struktur, die auch von den Zellinformationen ZI verwendet wird - empfangen alle Mobilstationen MSI, MS2, MS3, MS4 aus dem Funkzugangsnetz UTRAN über den Rundsendekanal BCCH die zweiten Informationen 12. Die zweiten Informationen 12 werden von den drei Mobilstationen MSI, MS2, MS3 zusätzlich zu den ersten Informationen II benötigt, um den Broadcast- Multicast-Dienst BMS zu empfangen. Für die vierte Mobilstation MS4 haben die zweiten Informationen 12 keine Funktion, solange sie nicht den Broadcast- oder Multicast-Dienst BMS emp- fangen möchte.On the basis of the cell information ZI, the three mobile stations MSI, MS2, MS3 are able to receive first information II, which are transmitted on the control channel MCCH. The mobile stations require the first information II in order to receive the broadcast or multicast service BMS on a common traffic channel MTCH. In addition to the cell information ZI - preferably integrated into the same hierarchical structure that is also used by the cell information ZI - all mobile stations MSI, MS2, MS3, MS4 receive the second information 12 from the radio access network UTRAN via the broadcast channel BCCH Information 12 is required by the three mobile stations MSI, MS2, MS3 in addition to the first information II in order to receive the broadcast multicast service BMS. The second information 12 has no function for the fourth mobile station MS4 as long as it does not want to receive the broadcast or multicast service BMS.
Die Auswertung sowohl der ersten als auch der zweiten Information II, 12 ermöglicht es den drei Mobilstationen MSI, MS2, MS3 den Broadcast- oder Multicast-Dienst BMS zu empfangen. Während des Empfangs des Broadcast- oder Multicast-Dienstes werden die ersten und zweiten Informationen II, 12 periodisch wiederholt. Während des Empfangs des Broadcast- oder Multicast-Dienstes BMS empfangen die drei Mobilstationen MSI, MS2, MS3 wiederholt die ersten Informationen II auf dem Kontroll- kanal MCCH. In den ersten Informationen II stehen alle Informationen zum Empfang des Broadcast- oder Multicast-Dienstes, die sich häufig ändern oder die wenig Signalisierungsaufwand erfordern. Im Rundsendekanal BCCH werden als zweite Informationen 12 diejenigen Informationen gesendet, die sich relativ selten ändern oder einen hohen Signalisierungsaufwand erfordern. Die zweiten Informationen 12 sind für eine optimale Ü- bertragung des Broadcast- oder Multicast-Dienstes BMS nicht kritisch und müssen daher seltener empfangen werden als die ersten Informationen II.The evaluation of both the first and the second information II, 12 enables the three mobile stations MSI, MS2, MS3 to receive the broadcast or multicast service BMS. While the broadcast or multicast service is being received, the first and second information II, 12 are repeated periodically. During the reception of the broadcast or multicast service BMS, the three mobile stations MSI, MS2, MS3 repeatedly receive the first information II on the control channel MCCH. The first information II contains all information about the reception of the broadcast or multicast service that changes frequently or has little signaling effort require. In the broadcasting channel BCCH, the second information 12 is the information that changes relatively rarely or requires a high signaling effort. The second information 12 is not critical for an optimal transmission of the broadcast or multicast service BMS and must therefore be received less frequently than the first information II.
Die zweiten Informationen 12 werden daher nur dann empfangen, wenn sie sich im Vergleich mit einem früheren Empfang geändert haben. In diesem Fall enthält die erste Information II eine Aufforderung, dass die zweiten Informationen 12 erneut im Rundsendekanal BCCH empfangen werden müssen. Nur wenn die drei Mobilstationen MSI, MS2, MS3 diese Aufforderung erhal- ten, empfangen sie die zweiten Informationen 12. Auf diese Weise ist sichergestellt, dass die drei Mobilstationen MSI, MS2, MS3 nur die Informationen empfangen und auswerten, die sie zum kontinuierlichen und einwandfreien Empfang des Broadcast- oder Multicast-Dienstes BMS benötigen.The second information 12 is therefore only received if it has changed compared to an earlier reception. In this case, the first information II contains a request that the second information 12 must be received again in the broadcast channel BCCH. Only when the three mobile stations MSI, MS2, MS3 receive this request do they receive the second information 12. This ensures that the three mobile stations MSI, MS2, MS3 only receive and evaluate the information that they need for continuous and perfect reception of the broadcast or multicast service BMS.
Bei einem anderen Ausführungsbeispiel enthalten die ersten Informationen II ausschließlich eine Aufforderung zum Empfang der zweiten Informationen und keine weiteren Daten. Im Extremfall werden die ersten Informationen II dann durch nur 1 Bit dargestellt. Die ersten Informationen II werden gar nicht gesendet, falls sich die zweiten Informationen seit einer früheren Aufforderung zum Empfang nicht geändert haben. Die drei Mobilstationen MSI, MS2, MS3 hören dann während des Empfangs des Broadcast- oder Multicast-Dienstes nur den Kon- trollkanal ab und warten auf erste Informationen II. Die durch diese auf dem Kontrollkanal MCCH gesendeten ersten Informationen II bewirkten Interferenzen können daher auf ein Minimum reduziert werden, weil die ersten Informationen II nur wenige Bits aufweisen können. Die auf dem Rundsendekanal übertragenen zweiten Informationen 12 stellen ohnehin keine zusätzliche Belastung der Funkübertragungen in der Funkzelle Z (beispielsweise in Bezug auf Interferenzen) dar, da der Rundsendekanal aufgrund der durch ihn gesendeten Zellinforma¬ tionen ZI sowieso periodisch Informationen aussenden muss. In die bekannte hierarchische Struktur der Zellinformationen ZI lassen sich die zweiten Informationen 12 leicht integrieren, ohne dass die Übertragung der Zellinformationen ZI beeinträchtigt wird.In another embodiment, the first information II contains only a request to receive the second information and no further data. In extreme cases, the first information II is then represented by only 1 bit. The first information II is not sent at all if the second information has not changed since an earlier request to receive it. The three mobile stations MSI, MS2, MS3 then only listen to the control channel during reception of the broadcast or multicast service and wait for first information II. The first information II caused by this on the control channel MCCH can therefore cause interference Minimum be reduced because the first information II can have only a few bits. The second information 12 transmitted on the broadcast channel in any case does not represent any additional load on the radio transmissions in the radio cell Z (for example with regard to interference) since the Broadcast channel due to the sent by him cell Informa ¬ ZI functions anyway periodically send information needs. The second information 12 can be easily integrated into the known hierarchical structure of the cell information ZI without the transmission of the cell information ZI being impaired.
Im Allgemeinen können alle Informationen, die die drei Mobilstationen MSI, MS2, MS3 zum Empfang des Broadcast- oder Mul- ticast-Dienstes BMS benötigen, beliebig auf die ersten und zweiten Informationen II, 12 verteilt werden. Insgesamt enthalten die ersten und zweiten Informationen II, 12 beispielsweise folgende dem Fachmann geläufige Angaben:In general, all of the information that the three mobile stations MSI, MS2, MS3 need to receive the broadcast or multicast service BMS can be distributed as desired between the first and second information II, 12. Overall, the first and second information items II, 12 contain, for example, the following information familiar to the person skilled in the art:
Halbstatische Dienst-Parameter:Semi-static service parameters:
MBMS Dienst-Flächen-Information (MBMS Service Area Information) - MBMS Dienst-Identifikation (MBMS Service Identification) , Dienstpriorität (Service Priority) , Sitzungsidentifika- tion (Session Identification)MBMS Service Area Information - MBMS Service Identification, Service Priority, Session Identification
Dynamische Dienst-Parameter:Dynamic service parameters:
Anzeige einer auf Funkressourcenkontrolle basierenden Verbin- düng (RRC Connection Establishment Indication) , Wahrscheinlichkeitsfaktor (Probability Factor) , Art der Dienstübertragung (Bearer Type (point-to-point or point-to-multipoint) ) , Konfiguration der Funkverbindung (Radio Configuration (and/or Identity) )Display of a connection based on radio resource control (RRC connection establishment indication), probability factor (probability factor), type of service transmission (bearer type (point-to-point or point-to-multipoint)), configuration of the radio connection (radio configuration (and / or Identity))
Die Konfiguration der Funkverbindung umfasst beispielsweise:The configuration of the radio connection includes, for example:
Funkverbindungsidentität (Radio Configuration Identity) , Spreizfaktor (Spreading Factor) , Kanalcodierung (Channeliza- tion Code) , Pulslänge (TTI lenght) , Transportformat (Transport Formats) , Beginn des Dienstes (Activation Time) , Dauer des Dienstes (Transmission Duration) , Periodizität (Periodi- city (DRX) )Radio configuration identity, spreading factor, channel coding, pulse length (TTI length), transport format, start of service (activation time), duration of the service (transmission duration), periodicity (periodicity (DRX))
Des weiteren können die ersten und/oder zweiten Informationen II, 12 Informationen über Broadcast- oder Multicast-Dienste benachbarter Funkzellen enthalten.Furthermore, the first and / or second information II, 12 can contain information about broadcast or multicast services of neighboring radio cells.
Selbstverständlich können in der Funkzelle Z auch weitere Broadcast- oder Multicast-Dienste angeboten werden, die eben- falls jeweils erste Informationen auf dem Kontrollkanal MCCH oder einem weiteren Kontrollkanal übertragen und die ebenfalls jeweils weitere für ihren Empfang nötige zweite Informationen über den Rundsendekanal BCCH übertragen. Bei dem Kontrollkanal MCCH handelt es sich beispielsweise um einen Gruppenkontrollkanal, d. h. einen Kontrollkanal, der Informationen für bestimmte Gruppen von Mobilstationen überträgt, wobei die Gruppen von Mobilstationen jeweils einem oder mehreren Broadcast- oder Multicast-Diensten zugeordnet sind. Erste und zweite Informationen, die unterschiedlichen Broad- cast- oder Multicast-Diensten zugeordnet sind, werden bei einer Übertragung auf dem Gruppenkanal durch jeweils einen Dienstidentifizierungspara eter gekennzeichnet. Jede Mobilstation kennt die Dienstidentifizierungsparameter der Broadcast- oder Multicast-Dienste, die die Mobilstation empfängt (ihrer Gruppe) und empfängt daher im Gruppenkanal nur die den jeweiligen Broadcast- oder Multicast-Diensten zugeordneten Informationen.Of course, further broadcast or multicast services can also be offered in the radio cell Z, which also each transmit first information on the control channel MCCH or another control channel and also each transmit further second information required for their reception via the broadcast channel BCCH. The control channel MCCH is, for example, a group control channel, i. H. a control channel that transmits information for certain groups of mobile stations, the groups of mobile stations being assigned to one or more broadcast or multicast services. First and second information, which are assigned to different broadcast or multicast services, are each identified by a service identification parameter during transmission on the group channel. Each mobile station knows the service identification parameters of the broadcast or multicast services that the mobile station receives (its group) and therefore only receives in the group channel the information assigned to the respective broadcast or multicast services.
In Figur 2 ist schematisch ein Ablauf von Informationsüber- tragungen dargestellt, die einer Mobilstation MSI den Empfang eines Broadcast- oder Multicast-Dienstes BMS ermöglichen.FIG. 2 schematically shows a sequence of information transmissions that enable a mobile station MSI to receive a broadcast or multicast service BMS.
Die Mobilstation MSI empfängt beim Eintreten in eine neue Funkzelle Z zunächst Zellinformationen ZI und zweite Informa- tionen 12 über einen Rundsendekanal BCCH eines Funkzugangsnetzes UTRAN. Anhand der einem Broadcast- oder Multicast- Dienst BMS zugeordneten zweiten Informationen 12 erkennt die Mobilstation, dass der Broadcast- oder Multicast-Dienst BMS in dieser Funkzelle Z angeboten wird. Aufgrund der Zellinformationen ZI kennt die Mobilstation MSI einen Kontrollkanal MCCH der ihr erste Informationen II zur Verfügung stellt, die sie benötigt, um den Broadcast- oder Multicast -Dienst BMS zu empfangen.When entering a new radio cell Z, the mobile station MSI first receives cell information ZI and second information 12 via a broadcast channel BCCH of a radio access network UTRAN. On the basis of the second information 12 assigned to a broadcast or multicast service BMS, the Mobile station that the broadcast or multicast service BMS is offered in this radio cell Z. On the basis of the cell information ZI, the mobile station MSI knows a control channel MCCH which provides it with the first information II which it needs to receive the broadcast or multicast service BMS.
Die Mobilstation empfängt die ersten Informationen II und wertet diese aus. In den ersten Informationen II findet die Mobilstation MSI die Zeit, zu der der Broadcast- oder Multicast-Dienst BMS startet, sowie die Aufforderung, vor dem Start des Broadcast- oder Multicast-Dienstes zweite Informationen 12 auf dem Rundsendekanal BCCH zu empfangen. Der Aufforderung folgend empfängt die Mobilstation MSI erneut auf den Rundsendekanal BCCH und empfängt neben den Zellinformationen ZI auch die zweiten Informationen 12. Die Mobilstation MSI wertet die zweiten Informationen 12 aus und empfängt anschließend zu der in den ersten Informationen II angegebenen Zeit auf einem gemeinsamen Verkehrskanal MTCH den Broadcast- oder Multicast-Dienst BMS. Die Funkressourcen des gemeinsamen Verkehrskanals MTCH hat die Mobilstation MSI den zweiten Informationen 12 entnommen.The mobile station receives the first information II and evaluates it. In the first information II, the mobile station MSI finds the time at which the broadcast or multicast service BMS starts, as well as the request to receive second information 12 on the broadcast channel BCCH before the start of the broadcast or multicast service. Following the request, the mobile station MSI receives again on the broadcast channel BCCH and, in addition to the cell information ZI, also receives the second information 12. The mobile station MSI evaluates the second information 12 and then receives on a common traffic channel MTCH at the time specified in the first information II the broadcast or multicast service BMS. The mobile station MSI has taken the radio resources of the common traffic channel MTCH from the second information 12.
Im folgenden empfängt die Mobilstation MSI kontinuierlich den Broadcast- oder Multicast-Dienst BMS. Ständig achtet die Mobilstation MSI dabei darauf, ob auf dem Kontrollkanal MCCH weitere erste Informationen II übertragen werden. Die Mobilstation MSI empfängt schließlich nach einem Zeitintervall ΔT weitere erste Informationen II, die sie auffordern erneut die zweiten Informationen 12 zu empfangen, da sich diese mittlerweile im Vergleich zum ersten Empfang geändert haben. Die Mobilstation MSI empfängt daraufhin erneut im Rundsendekanal BCCH die zweiten Informationen 12 und gleichzeitig auch die Zellinformationen ZI. Aufgrund der aktualisierten zweiten In- formationen 12 ist die Mobilstation MSI weiterhin in der Lage den Broadcast- oder Multicast-Dienst BMS optimal zu empfangen. Das erfindungsgemäße Verfahren ermöglicht es, einen Großteil oder sogar alle der für einen Broadcast- oder Multicast- Dienst nötigen Kontrollinformationen in Form der zweiten In- formationen 12 in einem Rundsendekanal BCCH zu übertragen. Es reicht also aus, dass in dem Kontrollkanal MCCH in den ersten Informationen II eine Aufforderung zum Empfang der zweiten Informationen 12 enthalten ist. Dadurch, dass nur ein minimaler zusätzlicher Signalisierungsaufwand gegenüber bestehenden Mobilfunksystemen in Form der Aufforderung auf dem Kontrollkanal nötig ist, treten nur geringe zusätzliche Interferenzen durch den zusätzlichen Kontrollkanal auf. Der Rundsendekanal wird genau wie in bisherigen Mobilfunksystemen, allerdings erweitert um die zweiten Informationen 12, übertragen. Die Übertragung der zweiten Informationen 12 erfordert daher keine zusätzlichen Funkressourcen.The mobile station MSI then continuously receives the broadcast or multicast service BMS. The mobile station MSI constantly checks whether further first information II is transmitted on the control channel MCCH. After a time interval ΔT, the mobile station MSI finally receives further first information II, which prompts it to receive the second information 12 again, since these have meanwhile changed compared to the first reception. The mobile station MSI then again receives the second information 12 in the broadcast channel BCCH and at the same time the cell information ZI. On the basis of the updated second information 12, the mobile station MSI is still able to optimally receive the broadcast or multicast service BMS. The method according to the invention makes it possible to transmit a large part or even all of the control information required for a broadcast or multicast service in the form of the second information 12 in a broadcast channel BCCH. It is therefore sufficient that the control channel MCCH contains a request to receive the second information 12 in the first information II. Because only a minimal additional signaling effort compared to existing mobile radio systems in the form of the request on the control channel is required, only minor additional interferences occur due to the additional control channel. The broadcast channel is transmitted exactly as in previous mobile radio systems, but expanded by the second information 12. The transmission of the second information 12 therefore does not require any additional radio resources.
Die Erfindung birgt weiterhin große Vorteile auch bei Mobili- tätsSzenarien:The invention also has great advantages in mobility scenarios:
Tritt eine Mobilstation MSI in eine Funkzelle ein, während die Übertragung eines Broadcast- oder Multicast-Dienstes bereits läuft, so liest diese Mobilstation automatisch beim Eintritt in die Funkzelle die Zellinformationen ZI und die zweiten Informationen 12 auf dem Rundsendekanal BCCH. Anhand der zweiten Informationen 12 erfährt die Mobilstation, ob sie zum Empfang des Dienstes eine Punkt-zu-Punkt-Verbindung benötigt, weil beispielsweise nur wenige Mobilstationen den Dienst empfangen, oder ob sie eine Punkt-zu-Mehrpunkt-Verbin- düng auf einem gemeinsamen Verkehrskanal MTCH benötigt. Nach Aufnahme des Empfangs des Broadcast- oder Multicast-Dienstes verhält sich die später zum Dienst hinzugekommene Mobilstation wie die anderen Mobilstationen, die den Broadcast- oder Multicast-Dienst bereits vorher empfangen haben, d. h. die Mobilstation verwendet nun gegebenenfalls ebenfalls den Kontrollkanal MCCH. Auch bei einem Wechsel der Funkzelle ergeben sich die gleichen Vorteile wie bereits im vorigen Absatz durch die Übertragung zumindest der wichtigsten Kontrollinformationen von Broadcast- oder Multicast-Diensten im Rundsendekanal. In der neuen Funkzelle empfängt die Mobilstation automatisch zunächst die Zellinformationen und erfährt anhand der enthaltenen zweiten Informationen sofort, wie sie einen Dienst, den sie bereits in der alten Funkzelle empfangen hat, weiterhin empfangen kann, bzw. ob der Dienst in der neuen Funkzelle ü- berhaupt angeboten wird. Wird der Dienst nicht angeboten kann die Mobilstation eine Warnung erhalten und im Falle eine Soft-Handovers kann evt . sogar eine Rückkehr in die alte Funkzelle oder der Wechsel in eine Funkzelle, die diesen Dienst anbietet, eingeleitet werden (beispielsweise vom Be- nutzer oder einem automatischen Steuer- oder Lenksystem der Mobilstation) . If a mobile station MSI enters a radio cell while the transmission of a broadcast or multicast service is already running, this mobile station automatically reads the cell information ZI and the second information 12 on the broadcast channel BCCH when it enters the radio cell. Based on the second information 12, the mobile station learns whether it needs a point-to-point connection to receive the service because, for example, only a few mobile stations receive the service, or whether it is using a point-to-multipoint connection on a common one MTCH traffic channel required. After receiving the broadcast or multicast service, the mobile station that is added to the service later behaves like the other mobile stations that have already received the broadcast or multicast service, ie the mobile station may now also use the control channel MCCH. Even if the radio cell is changed, the same advantages as in the previous paragraph result from the transmission of at least the most important control information from broadcast or multicast services in the broadcast channel. In the new radio cell, the mobile station automatically first receives the cell information and, based on the second information it contains, immediately learns how it can continue to receive a service that it has already received in the old radio cell, or whether the service in the new radio cell is offered at all. If the service is not offered, the mobile station can receive a warning and, in the case of soft handovers, even a return to the old radio cell or a change to a radio cell that offers this service can be initiated (for example by the user or an automatic control or steering system of the mobile station).

Claims

Patentansprüche claims
1. Verfahren zum Empfang eines Broadcast- oder Multicast- Dienstes (BMS) in einem Funkkommunikationssystem mit einem Rundsendekanal (BCCH) und einem Kontrollkanal (MCCH) , bei dem eine Empfangsstation (MSI, MS2, MS3) in dem Kontrollkanal (MCCH) erste Informationen (II) über den Broadcast- oder Multicast-Dienst (BMS) empfängt, die Empfangsstation (MSI, MS2, MS3) in dem Rundsendekanal (BCCH) zweite Informationen (12) über den Broadcast- oder Multicast-Dienst (BMS) empfängt, - und die Empfangsstation (MSI, MS2, MS3) den Broadcast- o- der Multicast-Dienst (BMS) unter Verwendung der beiden Informationen (II, 12) empfängt.1. A method for receiving a broadcast or multicast service (BMS) in a radio communication system with a broadcast channel (BCCH) and a control channel (MCCH), in which a receiving station (MSI, MS2, MS3) in the control channel (MCCH) first information (II) via the broadcast or multicast service (BMS), the receiving station (MSI, MS2, MS3) receives second information (12) via the broadcast or multicast service (BMS) in the broadcast channel (BCCH), and the receiving station (MSI, MS2, MS3) receives the broadcast or multicast service (BMS) using the two pieces of information (II, 12).
2. Verfahren nach Anspruch 1, bei dem die ersten Informationen (II) eine Aufforderung zum Empfang der zweiten Informationen (12) enthalten.2. The method according to claim 1, wherein the first information (II) contains a request to receive the second information (12).
3. Verfahren nach einem der vorstehenden Ansprüche, bei dem den ersten Informationen (II) entnehmbar ist, ob sich die zweiten Informationen (12) gegenüber einer früheren Aussendung geändert haben.3. The method according to any one of the preceding claims, wherein the first information (II) can be seen whether the second information (12) have changed compared to an earlier transmission.
4. Verfahren nach einem der vorstehenden Ansprüche, bei dem die ersten und/oder die zweiten Informationen (II, 12) periodisch übertragen werden.4. The method according to any one of the preceding claims, wherein the first and / or the second information (II, 12) are transmitted periodically.
5. Verfahren nach einem der vorstehenden Ansprüche, bei dem die Empfangstation (MSI, MS2, MS3) in dem Rundsende anal5. The method according to any one of the preceding claims, wherein the receiving station (MSI, MS2, MS3) in the broadcast anal
(BCCH) außerdem Zellinformationen (ZI) über wenigstens die Funkzelle (Z) empfängt, in der sich die Station (MSI, MS2, MS3) befindet.(BCCH) also receives cell information (ZI) about at least the radio cell (Z) in which the station (MSI, MS2, MS3) is located.
6. Verfahren nach Anspruch 5, bei dem die Empfangstation (MSI, MS2, MS3) zunächst die Zellinformationen (ZI), danach die ersten Informationen (II) und zuletzt die zweiten Informationen (12) empfängt.6. The method according to claim 5, wherein the receiving station (MSI, MS2, MS3) first receives the cell information (ZI), then the first information (II) and finally the second information (12).
7. Verfahren zum Senden eines Broadcast- oder Multicast- Dienstes (BMS) in einem Funkkommunikationssystem mit einem Rundsendekanal (BCCH) und einem Kontrollkanal (MCCH) , bei dem eine Sendestation (BS) in dem Kontrollkanal (MCCH) erste Informationen (II) über den Broadcast- oder Multicast- Dienst (BMS) sendet, die Sendestation (BS) in dem Rundsendekanal (BCCH) zweite Informationen (12) über den Broadcast- oder Multicast- Dienst (BMS) sendet, - und die Sendestation (BS) den Broadcast- oder Multicast- Dienst (BMS) unter Verwendung der beiden Informationen (II, 12) sendet.7. Method for sending a broadcast or multicast service (BMS) in a radio communication system with a broadcast channel (BCCH) and a control channel (MCCH), in which a transmitting station (BS) in the control channel (MCCH) first information (II) sends the broadcast or multicast service (BMS), the transmitting station (BS) in the broadcast channel (BCCH) sends second information (12) via the broadcast or multicast service (BMS), - and the transmitting station (BS) sends the broadcast - Or multicast service (BMS) using the two information (II, 12) sends.
8. Verfahren nach Anspruch 6, bei dem die ersten Informationen (II) eine Aufforderung zum Empfang der zweiten Informationen (12) enthält.8. The method according to claim 6, wherein the first information (II) contains a request to receive the second information (12).
9. Verfahren nach einem der Ansprüche 6 oder 7, bei dem den ersten Informationen (II) entnehmbar ist, ob sich die zweiten Informationen (12) gegenüber einer früheren Aussen- düng geändert haben.9. The method according to claim 6, wherein the first information (II) shows whether the second information (12) has changed compared to an earlier outside fertilization.
10. Verfahren nach einem der Ansprüche 6 bis 8, bei dem die ersten und/oder die zweiten Informationen (II, 12) periodisch übertragen werden.10. The method according to any one of claims 6 to 8, wherein the first and / or the second information (II, 12) are transmitted periodically.
11. Verfahren nach einem der Ansprüche 6 bis 9, bei dem die Sendestation (BS) in dem Rundsendekanal (BCCH) Zellinformationen (ZI) über wenigstens die Funkzelle (Z) sendet, die der Sendestation (BS) zugeordnet ist.11. The method according to any one of claims 6 to 9, wherein the transmitting station (BS) in the broadcast channel (BCCH) sends cell information (ZI) on at least the radio cell (Z) which is assigned to the transmitting station (BS).
12. Empfangsstation (MSI, MS2, MS3) zum Empfang eines Broadcast- oder Multicast-Dienstes (BMS) in einem Funkkommunikati- onssystem mit einem Rundsendekanal (BCCH) und einem Kontrollkanal (MCCH) , mit12. Receiving station (MSI, MS2, MS3) for receiving a broadcast or multicast service (BMS) in a radio communication onsystem with a broadcast channel (BCCH) and a control channel (MCCH), with
- Mitteln (SE) zum Empfang erster Informationen (II) über den Broadcast- oder Multicast-Dienst (BMS) in dem Kon- trollkanal (MCCH) ,Means (SE) for receiving first information (II) via the broadcast or multicast service (BMS) in the control channel (MCCH),
- Mitteln (SE) zum Empfang zweiter Informationen (12) über den Broadcast/Multicast-Dienst (BMS) in dem Rundsendekanal (BCCH) ,Means (SE) for receiving second information (12) via the broadcast / multicast service (BMS) in the broadcast channel (BCCH),
- und Mitteln (SE) zum Empfang des Broadcast/Multicast- Dienstes (BMS) unter Verwendung der beiden Informationen (II, 12) .- And means (SE) for receiving the broadcast / multicast service (BMS) using the two information (II, 12).
13. Sendestation (BS) zum Senden eines Broadcast- oder Multicast-Dienstes (BMS) in einem Funkkommunikationssystem mit einem Rundsendekanal (BCCH) und einem Kontrollkanal (MCCH) , mit13. Transmitting station (BS) for sending a broadcast or multicast service (BMS) in a radio communication system with a broadcast channel (BCCH) and a control channel (MCCH), with
- Mitteln (S) zum Senden erster Informationen (II) über den Broadcast- oder Multicast-Dienst (BMS) in dem Kontrollkanal (MCCH) , - Mitteln (S) zum Senden zweiter Informationen (12) über den Broadcast- oder Multicast-Dienst (BMS) in dem Rundsendekanal (BCCH) , und Mitteln (S) zum Senden des Broadcast- oder Multicast- Dienstes (BMS) unter Verwendung der beiden Informationen (II, 12) . - Means (S) for sending first information (II) via the broadcast or multicast service (BMS) in the control channel (MCCH), - Means (S) for sending second information (12) via the broadcast or multicast service (BMS) in the broadcast channel (BCCH), and means (S) for transmitting the broadcast or multicast service (BMS) using the two information (II, 12).
PCT/EP2004/001937 2003-03-25 2004-02-26 Method for receiving and transmitting a broadcast or multicast service in a radio communications system WO2004086785A2 (en)

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