DE10233439B4 - Method for transmitting at least one group message, associated network control unit and radio communication device - Google Patents

Abstract

method for transmission of at least one group message to at least one group of one or more radio communication devices in at least one a network control unit, in particular base station, provided Radio coverage area of one, in particular functioning according to the UMTS standard, Radio communication network using at least one during at least of a time interval (TTI) transmitted by at least one transport channel (TrCH) to a, in particular designed as CCTrCH, first multiplex channel (CCTrCH) linked sentence of data, with allowed records are determined by a first marking, which by a first Indicator (TFCI) is identifiable, and wherein at transmission of further messages on at least one second multiplex channel the first indicator (TFCI) is modified such that the first Marking and at least one second marking is identifiable, characterized in that the modification such that a memory area used by the first indicator in a first field (TFCI (f1)) and at least one second field (TFCI (f2), TFCI (f3)) such that the first field (TFCI (f1)) the first marking and the ...

Description

method for transmission at least one group message, associated network control unit, as well as Radio communication equipment

The The invention relates to a method for transmitting at least one Group message according to the preamble of claim 1, associated Network control unit according to the preamble of claim 5 and radio communication device according to the preamble of the claim 6th

at the transmission of data, no matter what kind, is in mobile between two directions of transmission distinguished. Generally, the data transmission will be from the i.A. stationary Base station to the mobile stations as transmission in the downlink direction referred to, in the data transmission in the opposite direction from a mobile station to the base station one speaks of transmission in uplink direction.

at many services and applications offered in modern mobile systems, such as news groups, video conferencing, video-on-demand, distribute applications, etc., there is a need to message not just one, but two and more mobile subscribers transferred to.

in principle Is it possible, for this during transmission the messages to the different subscribers to each recipient To send a copy of the data. While this technique is easy to implement, it does needed however, especially for size Groups, a very high bandwidth, because message about one Transfer number N of individual connections (unicast connections) and several times over common connection paths is sent, where N is the number the recipient the message is determined.

Therefore In modern mobile radio systems, a so-called point-to-multipoint transmission (multicast transmission) used, which is characterized by the fact that different Subscribers to whom the same message is to be sent group (multicast group), this group an address (multicast address) is assigned, so that to be transmitted Data directed only once to this multicast address and ideally only once over common connection paths sent from the sender to the receivers become. The sender does not necessarily have knowledge about the Number of recipients hiding behind the multicast address. To receive messages from a specific multicast group, you must a subscriber merely enrolls in this multicast group.

One according to the generic term of claim 1 trained is from the document WO 00/51373 known.

The The problem underlying the invention is the shipment and the reception of multicast messages in a mobile network, in particular to enable and / or improve such a so-called third generation.

These The object is achieved by the method according to claim 1, starting from the preamble of claim 1 by the characterizing features thereof, the radio communication device starting from the preamble of claim 4 by the characterizing Features as well as the network control unit starting from the generic term of claim 5 solved by its characterizing features.

at the method according to the invention for transmission of at least one group message to at least one group of one or more radio communication devices in at least one a network control unit, in particular base station, provided Radio coverage area of one, in particular according to the UMTS standard functioning, radio communication network using at least one while at least one time interval transmitted by at least one transport channel to make a, in particular as CCTrCH out, first multiplex channel linked Set of data, where allowed records by a first label are determined by a first indicator identifiable is, and where in transmission of further messages on at least one second multiplex channel the first indicator is modified such that the first identifier and at least one second identifier identifiable is, the said modification is such that a through the first memory area used in a first field and at least one second field are shared in such a way that by the first field the first label and the second field the second Identification is identifiable.

advantageous Further developments of the invention are the subject of dependent claims.

After that is preferably the indicator on a dedicated physical, especially the "Dedicated Physical Control Channel "DPCCH, Transfer channel.

alternative The indicator can be transmitted on a common physical channel becomes.

The Task is also by the radio communication device as well by a network control unit respectively by for the implementation of Procedure provided funds solved.

Of the Advantage of the invention is that thus a TFCI signaling for a hitherto Unknown assignment of one CCTrCH to at least one multicast Group allows becomes. Another advantage is that this is an already existing Concept is extended and thus only a small effort to realize needed becomes. It is also advantageous that this advanced concept for future innovations can be further developed, e.g. to a 4-fold split, 5-fold Split or generally split n times.

The Invention and its developments are described below with reference to Drawings closer explained.

It demonstrate:

1 UMTS architecture of the lower layers of the OSI layer model,

2 UMTS channel assignment according to the prior art,

3 Distribution of TFCI bits using two multiplex channels,

4 Distribution of TFCI bits using three multiplex channels.

Elements with the same function and mode of action are in the 1 With 4 each provided with the same reference numerals.

To facilitate understanding of the problem is based on the 1 Below, by way of example, individual components of the architecture of a UMTS mobile radio network are discussed, in particular the different types of channels known therefrom, which are used as an interface between different layers (layers) of the so-called protocol stack provided in accordance with the OSI reference model.

In 1 are the interfaces between a LAYER2 data link layer (OSI) reference layer layer, which can be found in a Medium Access Control (MAC) protocol and a protocol to support segmentation and return transport for payload and signaling data (Radio Link Control) ) RLC, and the physical layer physical layer LAYER1.

First, be the procedure on the network side for a particular active mobile station explained in a mobile radio cell.

Data from different sources is fed to the Medium Access Controller MAC on different logical channels LogCH. In the MAC, each logical channel LoGCH is then mapped to exactly one transport channel TrCH. It is also possible that more than one logical channel LogCH is mapped to one and the same transport channel TrCH. From the representation in the 1 this is also derivable since there are only two transport channels TrCH facing the illustrated three logical channels LogCH

in the Generally, the mapping of LogCHech channels LogCH occurs on the transport channels TrCH by multiplexing the logical channels, i. the data of several Logical channels LogCH are combined into a transport channel TrCH. This However, multiplexing can not be done arbitrarily, because logical channels LogCH, which are mapped to the same transport channel TrCH, essentially same transmission quality requirements, due to the so-called quality of service ("Quality of Service", QoS) is. This includes for example, maximum bit or block error rates (BER or BLER) as well as maximum delay times.

In the physical layer LAYER1, each transport channel TrCH is performed in accordance with the quality of service request steps, such as attaching so-called CRC blocks, which are used to detect erroneous messages on the receiver side, and channel coding, in which systematically Redundancy is added to the data in order to correct any errors that may occur due to the radio transmission.

in the Connection to the implementation of these steps for each transport channel TrCH, become within the physical layer LAYER1 certain transport channels TrCH to a Coded Composite Transport Channel (CCTrCH) by multiplexing merged.

This Coded Composite Transport Channel CCTrCH will then turn on one or more physical channels PhyCH mapped and a defined in accordance with UMTS Transmit air interface.

The The procedure described in each time interval ("Transmission Time Interval ", TTI) and performed has as a clear result the CCTrCH and the physical channels over which transfer the data become. In the case of dedicated data, i. Data only for one particular mobile station are thought, only LogCHech channels LogCH and transport channels TrCH multiplexes, which are assigned to exactly this one mobile station are.

For a better one understanding of what is set out below, details will be given at this point in terms of physical channels PhyCH received.

In UMTS is there for the transfer of information two types of radio channels: Dedicated channels (Dedicated Channels) and common channels (Common channels). The dedicated channels become a physical one Resource only for the transfer of data for a particular subscriber device (User Equipment) reserved. The common channels can transmit data be that for all subscribers are intended (e.g., the Primary Common Control Physical Channel P-CCPCH) or only for a specific participant. In the latter case must be on the common Channel or on another associated physical channel the Transfer information who, for which subscriber the data is intended for (e.g., a mobile station ID).

A dedicated channel is the so-called "Dedicated Channel", which is used in the FDD mode of the UMTS standard as a transport channel TrCH, wherein a mobile station can not be assigned to one, one or more transport channels TrCH simultaneously. If a mobile station is assigned at least one DCH, then all DCHs (an appended "s" is used here and in the following for plural formation) are exclusively processed to a CCTrCH which is likewise assigned exclusively to this one mobile station. In the following, such a CCTrCH will be referred to as Dedicated D-CCTrCH. Since DCHs are used for transmissions with constant data rates, as occur, for example, in the case of telephony, the same physical channel PhyCH is always used for the D-CCTrCH and thus always occupies the same amount of resources. This channel is referred to as "Dedicated Physical Data Channel" DPDCH and is alternately, ie in different time slots (multiplex) with a so-called "Dedicated Physical Control Channel" DPCCH sent as in a 2 can be seen, with further details can be found in [1]. The fields of the DPCCH are occupied on the transmitter side in the first layer LAYER1 and processed on the receiving side only by the first layer LAYER1, ie these control data are not forwarded to the MAC.

The receiver side, in general the mobile radio station, must be informed to each TTI which shares the respective (multiplexed) transport channels TrCH have on the data on the DPDCH, ie which so-called transport formats of the respective transport channels TrCH are present, at the receiving end a corresponding separation (" demultiplex ") the data to the respective transport channels TrCH perform. This is done via the DPCCH Transport Format Combination Indicator (TFCI) field of the illustrated burst. A TFCI value before additional protection coding normally has the length of 10 bits per 15 bursts or per 10 milliseconds. A list of all possible TFCI values previously signaled by the network side and their corresponding meaning could look as shown in Table 1. In the example, two DCHs should be combined into one D-CCTrCH. TFI ₁ and TFI ₂ specify the corresponding transport format of the two transport channels.

Table 1: Exemplary list of all possible TFCI values and their meaning for DCHs

One common channel, the im_FDD mode of the UMTS standard as a transport channel TrCH is the so-called "downlink shared channel" DSCH. A mobile station can not, one or more transport channels TrCH of type DSCH simultaneously be assigned. A transport channel TrCH of type DSCH exists but always only as an addition to an already existing transport channel TrCH of type DCH.

is a mobile station assigned at least one DSCH, so be all DSCHs of this mobile station also exclusively to a CCTrCH processed. In the following, such a CCTrCH is discriminated with (shared) S-CCTrCH. Also for the S-CCTrCH must be the receiver side be communicated to each TTI which shares the respective multiplexed transport channels TrCH to the data on the associated Physical channels PDSCH ("Physical Downlink Sha red Channel ") have to carry out an appropriate separation. This happens as well at the D-CCTrCH, about a specially for the S-CCTrCH and its DSCHs responsible TFCI.

There DSCHs unlike the DCHs for irregular emerging Data can be used here, in addition, the number of used Physical channels PhyCH vary from TTI to TTI. Therefore, for each TTI before the used Physical channels PhyCH will be announced. This additional information will also be with the help of specially for the S-CCTrCH TFCI signals.

Accordingly, the TFCI, which is responsible for the DSCHs, carries two kinds of information. A list of all possible TFCI values previously signaled by the network side and their corresponding meaning could look as shown in Table 2. In the example, only one DSCH should be combined to one S-CCTrCH. A first transport format TFI ₁ specifies the transport format of the one transport channel of the type DSCH, and c _{x, y} is intended to specify a specific physical channel PDSCH.

Table 2: Exemplary list of all possible TFCI values and their meaning for DSCHs

Should Now an S-CCTrCH and a D-CCTrCH are transmitted is the transmission two TFCI required. For this, the TFCI is the length of 10 bits transmitted on the DPCCH is, split (split). The two halves will be with TFCI (field1) TFCI (f1) and TFCI (field2) TFCI (f2), where TFCI (field1) the TFCI is the D-CCTrCH and TFCI (field2) is the TFCI to the S-CCTrCH.

In 3 this split is indicated, in which a first field TFCI (f1) and a second field TFCI (f2) each 5 bits are available. (This is also indicated in Table 2 in which the length of the illustrated TFCI is only five bits). In such a splitting, the length of the TFCI for the D-CCTrCH, see Table 1, should be shortened accordingly to five bits. However, other split ratios are possible, eg 3-7 or 8-2. This can be determined by the network as needed.

Around a transmission from messages to a multicast group, for example by means of transport channels of the type DSCH, here called MC-DSCH, according to the invention, in the example, several multicast groups each on one specific MC-DSCH and these MC-DSCHs to one MC's own CCTrCH could be summarized, with this being MC's own CCTrCH is to be called MC-CCTrCH, mobile stations, which belong to at least one of these several multicast groups, the corresponding MC-CCTrCH received. The MC-CCTrCH is then available to all mobile stations, which are to receive at least one multicast group assigned. Decisive: The MC-DSCHs enter the MC-CCTrCH, while the to only one mobile station belonging DSCHs in the mobile station specific S-CCTrCH.

The Invention allows this is advantageously done in an FDD UMTS mobile radio system Layer 1 signaling of multiple CCTrCHs per mobile station in the Downlink.

In order to is it possible, for example, that is a D-CCTrCH, an S-CCTrCH and an MC-CCTrCH from a mobile station can be received at the same time.

The first field TFCI (f1) is intended for the D-CCTrCH, the second field TFCI (f2) for the S-CCTrCH and the third Field TFCI (f3) according to the invention for the MC-CCTrCH to be used. The sum of for these fields used bits per 15 bursts or per 10 milliseconds should be at most the number of bits for the TFCI amount before a protection coding. This maximum value is according to the FDD mode of the UMTS standard ten bits per 15 bursts or per 10 milliseconds.

• – ein DCH und somit auch ein D-CCTrCH
• – ein DSCH und somit auch ein S-CCTrCH
• – ein MC-DSCH und somit auch ein MC-CCTrCH

empfangen werden.For a in 4 illustrated first embodiment is assumed that from a UMTS mobile station at the same time

• - a DCH and thus also a D-CCTrCH
• - a DSCH and thus also an S-CCTrCH
• - an MC-DSCH and thus also an MC-CCTrCH

be received.

Then, on the TFCI transmitted on the DPCCH, splitting into three fields TFCI (f1), TFCI (f2), TFCI (f3), as in 4 3, the first field TFCI (f1) of length four bits for the D-CCTrCH, the second field TFCI (f2) of length three bits for the S-CCTrCH and the third field TFCI (f3) of length three bits used for the MC-CCTrCH.

It could also other splitting conditions be realized, e.g. a 2-3-5 splitting or a 1-6-3 splitting. A list of the values of the first field TFCI (f1) for the D-CCTrCH and their meaning the shape analogous to Table 1. A list of the values of the second Field TFCI (f2) for the S-CCTrCH and its meaning would have the shape analogous to the Table 2. And a list of the third field TFCI (f3) for the MC-CCTrCH and their meaning for the Case that the multicast transmission through transport channels TrCH is realized by the type DSCH, also the shape analogous to the Table 2, with the respective TFCI values in the three tables analogous to a corresponding length of four, three or three bits, or in other splitting ratios a splitting ratios corresponding length.

One another embodiment This is the case when compared to the CCTrCHs listed in the first example more CCTrCHs, for example with transport channels from Type DSCH, to be received. In this case, a corresponding discontinued Split (split) performed, also for the other CCTrCHs allow TFCI signaling.

Claims (5)

Method for transmitting at least one group message to at least one group of one or more radio communication devices in at least one radio service area provided by a network control unit, in particular a base station, of a radio communication network operating in particular according to the UMTS standard using at least one during at least one time interval (TTI) from at least one transport channel (TrCH) transmitted to a, in particular configured as CCTrCH, the first multiplex channel (CCTrCH) associated set of data, where allowed Da are determined by a first identifier, which is identifiable by a first indicator (TFCI), and wherein upon transmission of further messages on at least one second multiplex channel, the first indicator (TFCI) is modified such that the first identifier and at least one second Identification is identified, characterized in that the modification is such that a used by the first indicator memory area in a first field (TFCI (f1)) and at least a second field (TFCI (f2), TFCI (f3)) are shared in that the first identifier and the second field (TFCI (f2), TFCI (f3)) are identifiable by the first field (TFCI (f1)). Method according to claim 1, characterized in that that the indicator is on a dedicated physical, in particular the "Dedicated Physical Control Channel "DPCCH, Transfer channel becomes. Method according to claim 1 or 2, characterized that the indicator is transmitted on a common physical channel becomes. Radio communication device, characterized by means to carry out the method according to any one of the preceding claims. Network control unit, characterized by means to carry out the method according to any one of claims 1 to 3.