DE10313356B4 - A method of receiving and a method for transmitting a broadcast or multicast service in a radio communication system and receiving station and transmitting station - Google Patents

Abstract

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 (MS1, MS2, MS3) in the control channel (MCCH) receives first information (I1) via the broadcast or multicast service (BMS),
The receiving station (MS1, MS2, MS3) in the broadcast channel (BCCH) receives second information (I2) via the broadcast or multicast service (BMS),
- And the receiving station (MS1, MS2, MS3) receives the broadcast or multicast service (BMS) using the two information (I1, I2).

Description

method for receiving and method for sending a broadcast or multicast service in a radio communication system as well as receiving station and transmitting station

The The invention relates to a method for receiving and a method for Sending a broadcast or multicast service in a radio communication system and a corresponding receiving station and a corresponding Transmitting station.

In The 3GPP (3rd Generation Partnership Program) are currently being processed specified to send the same data to many users. These Work in standardization is called multimedia Broadcast Multicast Service (MBMS).

Broadcast Services are services that are transmitted from one transmitting station to all stations which are within radio range of the transmitting station. The Broadcast station sends data from all reachable stations can be used. These include including information about spreading codes to be used in a radio cell of a cellular radio system with CDMA multiplex component (CDMA: Code Division Multiple Access) or over the transmission power to be selected by mobile stations.

Multicast services on the other hand, from one transmitting station to all stations, one will the signal transmission transmit the multicast group to be specified simultaneously. The so transferred Data is only from a specific group of accessible stations receive. For example, you can with multicast services specifically selected stations be supplied with new software (software download).

The Both data transmitted by broadcast or multicast services can be used User data as well as signaling data and their transmission can be done with different data rates.

In current mobile radio networks (e.g., UTRAN: Universal Terrestrial Radio Access Network) can only be a broadcast service at a low data rate (e.g., 32 kbps), the one about Transmit channel of the radio network becomes. The multiplexing of the service occurs in the core network (e.g., CBC Common Broadcast Channel) based on message type identifiers. The radio resource used for the broadcast service is used, is the subscriber station known by reading the cell information throughout Radio cell transmitted to all subscriber stations as broadcast information become.

It Now, new demands are placed on the networks, which especially high data rates (> 64 kbps) and a dynamic allocation of the radio network resources to individual Broadcast and / or multicast services. It should parallel multimedia services (text, audio, video, etc.) are transmitted to the subscribers in point-to-multipoint connections. The different MBMS services are separate from the core network streams provided. It is expected that the wireless network will record the data one or more radio channels multiplexes.

Of the The invention is therefore based on the object of specifying a method the reception and transmission of MBMS services with high data rates with dynamic allocation of radio resources.

These Task becomes with the procedures, the receiving station as well as the transmitting station solved according to the independent claims.

advantageous Training and 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 receives a receiving station in the control channel first information about the broadcast or multicast service receives the Receiving station in the broadcast channel second information about the Broadcast or multicast service and receives the receiving station Broadcast or multicast service using the two pieces of information. That way you can the for a reception of the service required information so on both channels be distributed that the channel with the larger transmission capacity and / or the channel that causes the least interference, the most Carries information. Farther can the information for the reception of the broadcast or multicast service is required, transmitted separately from the data of the broadcast or multicast service become. this makes possible high data rates and dynamic allocation of radio resources by means of independent of the data received first and / or second information.

From Advantage is when the first information is a request to receive the second information included, The receiving station can thus receive a broadcast or multicast service, for example For a first time only first information needed to to be received. To save resources, or if to one second time, for example, the transmission capacities of the Control channel is insufficient in the first information a request to receive the second information in the broadcast channel contain. The total for receiving the broadcast multicast service required Information can be dynamically distributed to the first and second information and the reception of the first and second information may also be be dynamically controlled by the content of the first information.

Especially it is advantageous if the first information indicates whether the second information opposite an earlier one Transmission changed to have. The second information may be in this embodiment The invention contains information necessary for receiving the broadcast or multicast service needed be, but over remain constant for a certain period of time. The receiving station receives before the start of the broadcast or multicast service once both the first as well as the second information, receives during the Broadcast or multicast service first information in the control channel and receives only second information in the broadcast channel again when have changed these since the last reception.

Is appropriate therefore, when the first and / or the second information is transmitted periodically become.

Highly advantageous it is when the receiving station in the broadcast channel cell information about at least the radio cell receives, where the receiving station is located. Such a broadcasting channel (BCCH: Broadcast Control Channel) is broadcast regularly in each radio cell, so that to carry the method according to the invention no additional Broadcast channel is needed. In particular, such a broadcasting channel may be transmitted from each receiving station, which moves into a new radio cell, be read automatically, so that a receiving station receives the second information automatically can receive.

From It is also advantageous if the receiving station first determines the cell information, then receive the first information and finally the second information.

In the method according to the invention for sending a broadcast or multicast service in a radio communication system with a broadcast channel and a control channel, sends a broadcast station in the control channel first information about the broadcast or multicast service, sends the transmitting station in the broadcast channel second information about the Broadcast or Multicast service and sends the transmitting station the Broadcast or multicast service using the two pieces of information.

further developments of the transmission method correspond to the developments of the receiving method.

The inventive receiving station and the transmitting station according to the invention have all means of implementation the corresponding procedures.

The Invention will be described below with reference to FIGS Embodiments explained in more detail.

It demonstrate:

1 an embodiment of a radio communication system according to the invention and

2 an embodiment of an inventive sequence for receiving or transmitting a broadcast or multicast service.

Same Reference numerals in the figures indicate like objects.

When Receiving station is considered in the following a mobile station. A mobile station is for example a mobile phone or also a portable devices for the transmission of image and / or Audio data, for fax, short message service SMS and eMail dispatch and to the internet access. It is therefore a general broadcasting and / or receiving unit of a radio communication system.

The invention can be used advantageously in any radio communication systems. Radio communication systems are to be understood as any systems in which data is transmitted between stations via a radio interface. Data transmission can be bidirectional as well as unidirectional. Radio communication systems are in particular any mobile radio systems, for example according to the GSM (Global System for Mobile Communications) or the UMTS (Universal Mobile Telecommunications System) standard. Also future mobile radio systems For example, the 4th generation should be understood by radio communication systems.

in the The following is the invention using the example of a mobile radio system described by the UMTS standard, but without being limited thereto.

In 1 schematically 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 MS1, MS2, MS3, MS4 are shown. The mobile stations MS1, MS2, MS3, MS4 each have a transmitting and receiving device SE. Via a broadcasting channel BCCH, the mobile stations MS1, MS2, MS3, MS4 receive cell information ZI via the radio cell Z in which the mobile stations MS1, MS2, MS3, MS4 are located. The cell information ZI contains all the information which the mobile stations MS1, MS2, MS3, MS4 need in order to be able to use radio connections in the radio Z. For example, the cell information ZI informs about the used radio resources of channels used in the radio cell Z. The mobile stations MS1, MS2, MS3, MS4 receive, for example, information about the spreading code, which a control channel MCCH uses to receive first information I1 via a broadcast or multicast service BMS, by means of the cell information ZI.

Three Mobile stations MS1, MS2, MS3 are the broadcast or multicast service Assigned to BMS, d. H. want to receive this service BMS or are from another side, for example from the radio access network UTRAN, to Reception provided. The fourth mobile station MS4 receives the Broadcast or multicast service BMS not only the Cell information ZI and second information I2.

by virtue of The cell information ZI is the three mobile stations MS1, MS2, MS3 capable of first information I1 transmitted on the control channel MCCH to receive. The first information I1 need the Mobile stations to the broadcast or multicast service BMS on to receive a common traffic channel MTCH. In addition to the cell information ZI - preferred integrated into the same hierarchical structure that is also used by the Cell information ZI is used - receive all mobile stations MS1, MS2, MS3, MS4 from the radio access network UTRAN via the Broadcast channel BCCH the second information I2. The second information I2 are added by the three mobile stations MS1, MS2, MS3 in addition to the first information I1 needed to the broadcast multicast service BMS to receive. For the fourth mobile station MS4 does not have the second information I2 Feature as long as they do not have the broadcast or multicast service BMS wants to receive.

The Evaluation of both the first and the second information I1, I2 allows the three mobile stations MS1, MS2, MS3 the broadcast or multicast service BMS to receive. While receiving the broadcast or multicast service will be the first and second information I1, I2 repeated periodically. During the Reception of the broadcast or multicast service BMS receive the three mobile stations MS1, MS2, MS3 repeats the first information I1 on the control channel MCCH. In the first information I1 stand all information for receiving the broadcast or multicast service, that change frequently or which require little signaling effort. In the broadcast channel BCCH are sent as second information I2 those information which change relatively rarely or require a high signaling overhead. The second information I2 are for an optimal transmission of the broadcast or multicast service BMS are not critical and therefore less frequent are received as the first information I1.

The Therefore, second information I2 will only be received if it is in comparison with an earlier one Reception changed to have. In this case contains the first information I1 is a request that the second information I2 must be received again in the broadcast channel BCCH. Just if the three mobile stations MS1, MS2, MS3 receive this request, receive the second information I2. That way is ensured that the three mobile stations MS1, MS2, MS3 only the Receive and evaluate information that makes it continuous and proper reception of the broadcast or multicast service BMS need.

In another embodiment, the first information I1 contains only a request to receive the second information and no further data. In extreme cases, the first information I1 is then represented by only 1 bit. The first information I1 is not sent at all if the second information has not changed since an earlier request to receive. The three mobile stations MS1, MS2, MS3 then only listen to the control channel during the reception of the broadcast or multicast service and wait for first information I1. The interference caused by these first information I1 transmitted on the control channel MCCH can therefore be reduced to a minimum since the first information I1 can have only a few bits. In any case, the second information I2 transmitted on the broadcast channel does not represent an additional burden on the radio transmissions in the radio cell Z (for example with regard to interferences) since the broadcast channel periodically inforces information anyway due to the cell information ZI transmitted by it send out messages. In the known hierarchical structure of the cell information ZI, the second information I2 can be easily integrated without affecting the transmission of the cell information ZI.

in the Generally can all information that the three mobile stations MS1, MS2, MS3 receive of the broadcast or multicast service BMS, arbitrarily on the first and second information I1, I2 are distributed. Total included the first and second information I1, I2, for example, the following Information familiar to the person skilled in the art:

Semi-static service parameters:

MBMS Service area information (MBMS Service Area Information), MBMS Service Identification (MBMS Service Identification), Service Priority, Session Identification (Session identification)

Dynamic service parameters:

display a radio resource control based connection (RRC Connection Establishment Indication), probability factor (Probability Factor), type of service transfer (Bearer Type (point-to-point or point-to-multipoint)) configuration the radio connection (Radio Configuration (and / or Identity))

The configuration of the radio connection includes, for example:
Radio Configuration Identity, Spread Factor, Channelization Code, TTI Lenght, Transport Format, Activation Time, Transmission Duration, Periodicity (DRX))

Of others can the first and / or second information I1, I2 information about broadcast or multicast services of adjacent radio cells.

Of course, in the radio cell Z also offered other broadcast or multicast services which also each first information on the control channel Transfer MCCH or another control channel and the same each further for their reception necessary second information about transmit the broadcast channel BCCH. The control channel MCCH is, for example, a Group control channel, d. H. a control channel, the information for specific groups from mobile stations, where the groups of mobile stations each have one or more broadcasting or multicast services. First and second information, associated with the different broadcast or multicast services are, are in a transmission on the group channel by a service identification parameter characterized. Each mobile station knows the service identification parameters the broadcast or multicast services that the mobile station receives (its Group) and receives therefore in the group channel only the respective broadcast or multicast services associated information.

In 2 schematically a flow of information transfers is shown, which allow a mobile station MS1 to receive a broadcast or multicast service BMS.

The Mobile station MS1 receives when entering a new radio cell Z first cell information ZI and second information I2 about a broadcast channel BCCH of a radio access network UTRAN. Based the second information associated with a broadcast or multicast service BMS I2 recognizes the mobile station that the broadcast or multicast service BMS is offered in this radio cell Z. Because of the cell information ZI, the mobile station MS1 knows a control channel MCCH of its first Provides information I1, she needs to receive the broadcast or multicast service BMS.

The Mobile station receives the first information I1 and evaluates it. In the first Information I1, the mobile station MS1 finds the time when the Broadcast or multicast service BMS starts, as well as the request, second information before starting the broadcast or multicast service I2 on the broadcast channel BCCH. Following the request receives the mobile station MS1 again on the broadcast channel BCCH and receives next the cell information ZI also the second information I2. The Mobile station MS1 evaluates the second information I2 and then receives the time specified in the first information I1 on a common Traffic channel MTCH the broadcast or Multicast service BMS. The radio resources of the common traffic channel MTCH has taken the mobile station MS1 from the second information I2.

In the following, the mobile station MS1 continuously receives the broadcast or multicast service BMS. The mobile station MS1 constantly pays attention to whether further first information I1 is transmitted on the control channel MCCH. Finally, after a time interval ΔT, the mobile station MS1 receives further first information I1, which requests it again to receive the second information I2, since these have meanwhile changed in comparison to the first reception. The mobile station MS1 receives again in the broadcast channel BCCH the second information I2 and at the same time the cell information ZI. Due to the updated second information I2, the mobile station MS1 is still able to optimally receive the broadcast or multicast service BMS.

The inventive method allows it, much of it or even all of them for a broadcast or multicast service force Control information in the form of the second information I2 in one Broadcast channel BCCH. So it is sufficient that in the control channel MCCH in the first Information I1 a request to receive the second information I2 is included. By doing that, only a minimal additional Signaling effort compared existing mobile systems in the form of a call on the control channel necessary, There is little additional interference through the additional Control channel on. The broadcast channel will be just like in previous ones Mobile radio systems, but extended to the second information I2, transfer. The transfer The second information I2 therefore does not require any additional information Radio resources.

The invention also has great advantages, even in mobility scenarios:
If a mobile station MS1 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 I2 on the broadcast channel BCCH on entering the radio cell. On the basis of the second information I2, the mobile station learns whether it needs a point-to-point connection to receive the service, for example because only a few mobile stations are receiving the service or if it is using a point-to-multipoint connection on a common traffic channel MTCH needed. After receiving the reception of the broadcast or multicast service, the mobile station added later to the service behaves like the other mobile stations which have already received the broadcast or multicast service, ie the mobile station may now also use the control channel MCCH.

Also When changing the radio cell, the same advantages arise as in the previous paragraph, by transferring at least the most important ones Control information of broadcast or multicast services in the Broadcast channel. In the new radio cell, the mobile station receives automatically first the cell information and experiences Based on the second information contained immediately, as one Service that she has already received in the old cell can receive, or whether the service in the new radio cell at all is offered. If the service is not offered, the mobile station receive a warning and in case of a soft handover can evt. even a return into the old radio cell or the switch to a radio cell, this one Service is initiated (for example, by the user or an automatic control or steering system of the mobile station).

Claims (13)

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 (MS1, MS2, MS3) in the control channel (MCCH) first information (I1) via the Receive broadcast or multicast service (BMS), The receiving station (MS1, MS2, MS3) in the broadcast channel (BCCH) second information (I2) via the Receive broadcast or multicast service (BMS), And the receiving station (MS1, MS2, MS3) using the broadcast or multicast service (BMS) of the two information (I1, I2). The method of claim 1, wherein the first information (I1) a request to receive the second information (I2) contain. Method according to one of the preceding claims, in the first information (I1) can be deduced whether the second Information (I2) compared an earlier one Transmission changed to have. Method according to one of the preceding claims, in the first and / or the second information (I1, I2) transmitted periodically become. Method according to one of the preceding claims, in the receiving station (MS1, MS2, MS3) in the broadcast channel (BCCH) also cell information (ZI) about at least the radio cell (Z) receives, in which the station (MS1, MS2, MS3) is located. Method according to claim 5, wherein the receiving station (MS1, MS2, MS3) first the cell information (ZI), then the first information (I1) and last receives the second information (I2). Method for transmitting 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 (I1) via the Broadcast or multicast service (BMS) sends, - the transmitting station (BS) in the broadcast channel (BCCH) second information (I2) on the Broad cast or multicast service (BMS), and the transmitting station (BS) sends the broadcast or multicast service (BMS) using the two pieces of information (I1, I2). Method according to claim 6, wherein the first information (I1) a request to receive the second information (I2) contains. Method according to one of claims 6 or 7, wherein the first Information (I1) is removable, whether the second information (I2) compared to one earlier Transmission changed to have. Method according to one of claims 6 to 8, wherein the first and / or periodically transmitting the second information (I1, I2) become. Method according to one of claims 6 to 9, wherein the transmitting station (BS) in the broadcast channel (BCCH) cell information (ZI) over at least the Radio cell (Z), which is assigned to the transmitting station (BS). Receiving station (MS1, MS2, MS3) to receive a Broadcast or multicast service (BMS) in a radio communication system with a broadcast channel (BCCH) and a control channel (MCCH), With - funds (SE) for receiving first information (I1) via the broadcast or multicast service (BMS) in the control channel (MCCH), - Means (SE) for reception second information (I2) about the broadcast / multicast service (BMS) in the broadcast channel (BCCH), - and means (SE) for receiving the broadcast / multicast service (BMS) using the both information (I1, I2). 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 - funds (S) for transmitting first information (I1) via the broadcast or multicast service (BMS) in the control channel (MCCH), - Means (S) for sending second Information (I2) about the broadcast or multicast service (BMS) in the broadcast channel (BCCH), - and Means (S) for sending the broadcast or multicast service (BMS) under Use of the two information (I1, I2).