DE10320156A1 - Data transmission involves repeatedly sending channel quality information from receiver to transmitter if first activity state exists and time since last quality data transmission exceeds threshold - Google Patents

Abstract

The method involves transmitting data wirelessly taking account of channel quality by repeatedly sending channel (CH2) quality information (CGI) from receiver (R) to transmitter (S), determining a data transmission activity state in the receiver, determining the time since the last successful transmission of channel quality information and sending further channel quality information if a first activity state exists and the time exceeds a threshold. Independent claims are also included for the following: (A) a terminal with a transmission/reception unit (B) a base station with a transmission/reception unit (C) and a communications network with a terminal and abase station.

Description

The The invention relates to a method for data transmission via a data transmission channel in a communication network between a transmitter and a receiver via a Radio link available is provided.

The capacity a data transfer from a sender to a receiver depends significantly depend on the fact that at the right time current information regarding the transmission quality of the used Data transmission channel on Transmitters are available. Only then can the transmitter send parameters for the adapt the sending data to the current situation to achieve satisfactory transmission results to achieve. The transmission parameters are, for example, transmission parameters or viewed modulation or coding scheme. The current information in terms of the transmission quality is off so-called "channel measurements" or "channel estimates" obtained.

The Problems are explained below using an example from the UMTS standard described (UMTS: Universal Mobile Telecommunication System). For clarification of terms referred to the figure description.

For UMTS a packet-wise high-speed data transmission for one shared channel proposed, the so-called HSDPA (Highspeed Downlink packet access). The receiver is a terminal the transmitter is a base station. This HSDPA standard looks slow Signaling of control information through higher layers of the OSI layer model (OSI: Open System Interconnection), which the channel measurements for HSDPA Taxes. The control information for these channel measurements is mainly the temporal rate of the measurements, the temporal offset (shift) in terms of a reference and the number of retries in transmission of a measured value. This means that after building a radio link or "radio link" at a fixed rate Measurements carried out become independent of whether and when actually Data on the for HSDPA established common downlink data channel HSDSCH (Highspeed Downlink Shared Channel) can be sent. Therefore on the one hand, under certain circumstances many unnecessary Measurements taken, on the other hand at the time of an actual packet data transfer, the so-called "packet call" no current measurement available. A packet data transfer can consist of several individual packet calls, each again can consist of several individual data packets.

As Remedy has so far been proposed to provide additional information about the The state of the radio channel can be found in the power control. Indeed is this for the case that the terminal is in the so-called soft transfer mode or "soft handover" is not possible, because there are problems with the power regulation. Under "soft handover" is a state understood, in which a terminal is connected to several base stations. The power is regulated so that the mobile station or the terminal uses the data received with the aid of the data received Can receive signals from all base stations correctly. That means but generally not that the terminal the signal of the particular Base station that sends the HSDPA data receives correctly. Since the HSDPA data packets only from this one base station to the The power control delivers the mobile station for one Set of optimized base stations is not a satisfactory one additional information. Therefore were the solution The following suggestions have been made regarding the problem of current channel information data:

• 1. A so-called activity-based channel quality information feedback (Activity based-CQI Feedback, CQI: Channel Quality Information). The rate of cyclical measurements is then increased as soon as on the terminal or terminal is determined that data is being sent. at a packet data transmission according to HSDPA can in particular with every feedback, that a received packet could be decoded or not one additional channel information message CQI are sent. This feedback can, for example, a so-called "ACK" (Acknowledgment) or "NAK" ("No Acknowledgment"). Since there is a delay time between the determination of data activity at the terminal, the implementation and transmission the measurement and the reception and evaluation of the measurement in the transmitter, so the base station is present, this leads disadvantageously to that for every packet data transmission the first packets without current channel information message or Transfer channel measurement Need to become. Furthermore, during an active data transmission through the increased Send rate for the channel information message may need an unnecessary number of channel information messages sent, making unnecessary Upward interference is produced.
• 2. Another possibility consists of an additional channel information message after receiving a NAK to send. The same disadvantages as described above occur here on.
• 3. As a further option, it has been proposed to specifically request a channel information message. This solves the problem of missing current information at the beginning of a data transmission However, the explicit signaling on the HS-SCCH, the control channel for HSDPA, leads to an additional allocation of resources in the downward direction. It is also disadvantageous that the explicit request process results in a delayed first transmission of the first packet of a packet data transmission.
• 4. Another method is that the terminal is accurate then an additional one Sends channel information message when, for example, the terminal at decoding determines that the coding or modulation scheme is too good or too bad. This method represents for Already active data connections ensure that channel information messages exactly when and when they are needed. A disadvantage of that is that the recipient of these channel information messages, i.e. the base station for HSDPA, the times at which the channel information messages are sent were not known. This makes detection and decoding of these messages difficult.

In summary So the common disadvantage of all of these methods is that not At the same time, current channel information is available and saves resources is worked.

go out From this prior art it is the object of the present invention a method of data transmission specify at which current channel quality information with minimized resource allocation guaranteed becomes.

This Object is achieved by a method according to claim 1, further by a terminal according to claim 12, a base station according to claim 13 and a communication network according to claim 14 solved. Advantageous further training can be found in the dependent Claims.

there is used in a method for wireless data transmission between a transmitter and a receiver a wireless data transmission channel in a communication system provided. So that the sender adapted the data to the current one channel quality of the data transmission channel can, is from the recipient repeatedly transmit channel quality information to the transmitter. The recipient or the transmitter provides an activity state of the data transmission fixed, for example whether data is currently being transmitted or its transmission is signaled or whether no data is transmitted and also no arrival of data is signaled.

Farther becomes the time interval to a previous transmission determined.

If this time interval exceeds a certain first time interval and at the same time a certain state of activity, especially the Start or the existence of a data transfer, then is from the recipient transmit a channel information message to the receiver.

By the passing the first time interval to another transmission is ensured that not unnecessary many channel information messages are transmitted. Farther Such a method also has the advantage that the point in time on which further channel quality information is transmitted is and so arrives at the transmitter, at least approximately known to the transmitter is because this time with an action by the transmitter, namely for example the beginning of a data transfer correlated.

The Invention is based on the idea that one possible current channel quality information is present at the transmitter without unnecessarily transmitting channel quality information would. The first time interval represents a maximum distance, at its exceeding the transmission another channel quality information he follows.

The data transfer can in particular be packaged or at a circuit-switched Connection made discontinuously. With such data transfers can the quality can be easily adjusted gradually.

According to one An advantageous embodiment can be the communication network act as a cellular network, in particular according to the UMTS standard. The transmitter can be a fixed base station and the receiver act as a mobile terminal. In particular, such a data transmission method can be used apply to HSDPA.

As well the terminal can represent the transmitter and the base station the Receiver. This data transfer process let yourself then in particular to a high-speed transmission in the upward direction from the terminal to the base station, for example HSUPA (High Speed Uplink Packet Access) or EUDCH (Enhanced Uplink Dedicated CHannel) apply.

In order to adapt the transmission to the activity state of the data transmission, the first time interval can be determined depending on the activity state. In particular, various activity states are provided for the start of a data transfer and an ongoing data transfer and no "active" data transfer. Active means here that not only control data but also user data are transmitted.

If If no active data connection is provided, a specific one is used first time distance selected. Then this first time interval at the start of a data transmission be reduced so first current channel quality information at Transmitter available.

is then the data transfer in progress, this first time interval can be increased to after data transfer again increased to the above-mentioned, still greater value to become.

In particular can also be repeated, in particular cyclical transmission of channel quality information be provided at certain times, the further, by the above Conditions defined measurements can be added. The time for this Repeated, in particular cyclical measurements can be specified by the communication network be, which makes about unnecessary Interference between receivers, especially terminals.

In an advantageous embodiment if the time interval for previous transmission exceeds the first interval, the time interval to a subsequent transmission, its time is already known, i.e. transfers determined at predetermined times. Only if also this temporal Distance exceeds a specified second time interval, a further transmission of channel quality information carried out.

Also this second time interval can depend on the state of activity the data transmission be determined.

On wireless data transmission channel can be through a radio link or an optical transmission be formed.

The The invention further relates to a terminal and a base station as well a communication network with which or through which this procedure is carried out.

The In the following, the invention is explained on the basis of examples partially also shown in the figures:

1 shows the schematic relationship between transmitter, receiver and network;

2 shows the timing of transmission of the channel quality information and data transmission;

3 shows the timing of a signaling at HSDPA.

Before a detailed representation of the figures is used, the terms used should first be clarified:
A communication system or communication network is a structure for exchanging data. This can be, for example, a cellular mobile radio network, such as the GSM network (Global System of Mobile Communications) or the UMTS network (Universal Mobile Telecommunications System). A communication network comprises at least two connection nodes, so-called "point to point" connections also fall under this term.

In A communication system are generally terminals and base stations provided that about a radio interface connect to each other. In UMTS the communication system or radio transmission network has at least base stations, here also called NodeB, as well as radio network control units or Radio Network Controller (RNC) to connect the individual base stations on. The terrestrial radio access network or "Universal Terrestrial Radio Access Network" UTRAN is the radio one Part of a UMTS network, in which, for example, the radio interface is also made available becomes. A radio interface is always standardized and defines the All physical and protocol specifications for the Data exchange, for example the modulation method, the bandwidth, the frequency swing, access procedures, security procedures or Switching techniques. The UTRAN thus comprises at least base stations as well as at least one RNC.

A Base station is a central unit in a communication network, which in the case of a cellular Cellular network terminals or communication terminals within a cell of the mobile radio network is operated via one or more radio channels. The base station provides the air interface between the base station and terminal ready. It takes over the handling of radio operations with the mobile participants and monitored the physical radio link. It also transmits the user and status messages to the terminals. The base station has no switching function, but just a supply function. Includes a base station at least one transmitting / receiving unit.

A terminal can be any communication terminal via which a user communicates in a communication system. There are, for example, mobile radio terminals such as mobile telephones or portable computers with a radio module under. A terminal is often also referred to as a "mobile station" (MS) or in UMTS "user equipment" (UE).

in the Mobile radio is differentiated between two connection directions. The downlink or "Downlink" (DL) the direction of transmission from the base station to the terminal. The uplink or "uplink" (UL) designated the opposite direction of transmission from the terminal to the base station.

In Wideband transmission systems, such as a UMTS cellular network, a channel is a sub-area one available standing total transmission capacity. As a radio channel becomes a wireless communication path in the context of this application designated.

In a mobile radio system, for example UMTS, is available for the transmission of data two types of physical channels: dedicated channels or "dedicated channels" and shared or "common channels". With the dedicated Channels become a physical resource only for the transmission of information for a certain terminal reserved. The common channels can transmit information be the for all terminals are thought of, for example the primary common physical control channel or "primary common control physical channel" (P-CCPCH) in the downlink, or else all terminals share a physical resource. This is the case with the HS-PDSCH, via which to a terminal in dependence on the connection quality data is sent to the terminal.

In Mobile radio systems such as UMTS are in addition to circuit-switched or "circuit switched" services where a connection during their duration is permanently allocated, also packet-oriented or "packet switched" services are provided. Circuit-switched Services can also carried out discontinuously become.

In 1 a transmitter S and a receiver R can be seen in a communication system CN. The transmitter S sends data to the receiver R via a first channel connection CH1. The receiver R can send data to the transmitter S via a second channel connection CH2.

The The transmitter S can be a base station, for example, the receiver R a Terminal. The communication network system can be, for example a UMTS system, the GSM or other standards. The first channel connection CH1 can have multiple channels include, for example, a data transmission channel for transmission of user data or "load bits "and one Control channel for transmission of control information. The second channel connection CH2 can only have one Control channel include or as the first channel connection CH1 consist of a control channel and a data transmission channel.

For a transfer of user data via the Data transmission channel of the first channel connection CH1 from the transmitter to the receiver it is important that the channel quality this data transmission channel is known. To do this, the recipient determines, for example, that Terminal, a channel quality information from data of the first channel connection or "channel quality Information "CQI.

The receiver R can this channel quality information also from data from general control channels. In case of HSDPA would this is, for example, the general pilot channel CPICH (Common Pilot Channel) act.

This Channel quality information or "Channel Quality Information "CQI is from the recipient R transmitted to the transmitter S, for example about the control channel of the second channel connection CH2.

Now is it for the data transmission over the first Channel connection important that a timely channel quality information CQI at transmitter S is present. At the same time, channel quality information should not be unnecessarily CQI will be sent as this, as stated earlier, will cause interference leads. Therefore, a timing of the transmission is within the scope of the invention this channel quality information CQI proposed.

In 2 An example of this time coordination can be seen under the boundary condition that there are regular, predetermined transmissions of the channel quality information CQI. In 2 a time axis labeled T is now shown, the regular transmissions CQI-TX take place at certain times. A first data transmission DTX1 should now take place. For this purpose, it is determined whether the time interval t_delta between the first data transmission DTX1 and a regular transmission CQI-TX is greater than a defined first time interval. If this is the case, the transmitter additionally transmits the channel quality information CQI to the receiver.

Generally it is checked whether a maximum time interval to the previous or next known one Measurement exceeded becomes. This can be seen on the second data transmission DTX2, where the time interval between the t_delta 'and the following channel quality information transmission CQI-TX is detected.

A data transfer can look like The third data transmission DTX3 shown also extends over several regular channel quality information transmissions CQI-TX. During the period of the transmission, it is ensured that no further transmission of channel quality information takes place which takes place too close to regular transmissions.

to Differentiation of the state "beginning of a Data transmission "and" existence of a data transmission "can with a packet data transmission or a discontinuous circuit-switched transmission the length of time since the last transmission of a data packet or the length to take the break. If this period is greater than a predetermined value is the following inactivity time is called, this means the "start of a data transmission". This is also a transition criterion can be specified between both states.

This Inactivity time is preferably greater than a round trip delay or "round trip delay" selected. Under a round trip delay means the time it takes a message sent by a sender to the recipient decode, inform the transmitter of the result of this decoding, that the transmitter then decodes again and then depending of this result to send the message one more time.

The Choosing the time period greater than A round trip delay has the following background: Requires that last packet of a packet data transmission or a "packet calls "due to an insufficient reception quality several transmissions, then take place these always with a time interval that is at least one round trip delay is, because the sender of the data packet cannot know beforehand that the Package could not be received. If the time span is longer than chosen a round trip delay, then this case of data transmission packet sent several times not mistakenly as Start of a new data transfer designated. This definition can be used in particular for HARQ (Hybrid Automatic Repeat Request) procedures can be applied, for example for HSDPA. There is the round trip delay typically six transmission time intervals or "transmission time intervals "TTI. With HSDPA, a TTI defines a time interval within which sends a base station to a terminal. The round trip delay depends on how also described by the response speed of the base station which, in contrast to the reaction speed of the mobile station is not standardized, but by each manufacturer depending on the Skills the implementation used can be chosen. Therefore it may be necessary to change the time period depending on the base station being used to choose.

Farther terminals are provided that are not in every transmission time interval TTI data about Can receive HSDPA. In this case, the inactivity time is preferably given to the thereby changed adjusted round trip delay.

in the The invention is explained in more detail below using examples on HSDPA. The However, the invention is also for example in a corresponding High-speed transmission method in the upward direction to be used, for example a procedure according to HSUPA or EUDCH.

In 3 the time sequence of the signaling at HSDPA can be seen. Control information is sent in the downward direction on the so-called common high-speed control channel HS-SCCH or "high-speed shared control channel". Two time slots or "timeslots" later the transmission of the actual data or user data begins on the associated data transmission channel, the physical high-speed downlink channel HS-PDSCH or "High-Speed Physical Downlink Shared Channel". An arrow indicates when the associated feedback AN via correct decoding (ACK) or incorrect decoding (NAK) is sent from the terminal in the upward direction to the base station. This confirmation or feedback AN is marked in the drawing with a running index n and with hatching. The time duration of the measurement of the data for the channel quality information CQI is called the measurement period MP.

The second arrow from the feedback AN, n in the HS-DPCCH to the HS-SCCH indicates from what point in time this confirmation at the transmitter, i.e. the base station, and thus one corresponding reaction can take place on the HS-SCCH. The times from which a reaction is possible are at the HS-PDSCH and HS-SCCH with a gray background.

• 1. Vom Kommunikationsnetz vorbestimmte, insbesondere zyklisch wiederkehrende CQI-Feedbacks. Die Vorbestimmung kann insbesondere durch eine zentrale Einheit wie Basisstation oder RNC erfolgen. Eine Vorbestimmung durch die Basisstation hat den Vorteil, dass sich der Funkverkehr insbesondere in Hinblick auf Interferenzen innerhalb einer Funkzelle einfach regeln lässt; bei einer Regelung mit dem RNC kann auch eine Regelung in Hinblick auf mehrere Funkzellen erfolgen.
• 2. Zusätzliche CQI-Feedbacks bei Beginn einer Datenübertragung
• 3. Zusätzliche CQI-Feedbacks während einer aktiven Datenübertragung.

With this configuration, three different occasions are now used to transmit the channel quality information or "CQI feedback":

• 1. CQI feedback predetermined by the communication network, in particular cyclically recurring. The predetermination can in particular be carried out by a central unit such as a base station or RNC. Predetermination by the base station has the advantage that radio traffic can be easily regulated, particularly with regard to interference within a radio cell; in the case of regulation with the RNC, regulation with regard to several radio cells can also take place.
• 2. Additional CQI feedback at the start of a data transfer
• 3. Additional CQI feedback during an active data transmission.

For the occasions 2 and 3 Time intervals are now defined in accordance with the above-mentioned requirement, which determine the time interval between CQI feedbacks from these events and at least the cyclical CQI feedbacks. Optionally it can be regulated that predetermined CQI feedbacks are given priority. This priority can be regulated, for example, by aborting, postponing or temporarily prohibiting CQI feedback according to 2nd and 3rd. Alternatively, the priority can be regulated depending on parameters that affect data traffic.

In the different states, different conditions can be selected for sending CQI feedback. For example, CQI feedback can be sent at the beginning of a data transmission immediately after the terminal determines this state, whereas otherwise (e.g. according to method 2 of the prior art) only CQI feedback is only sent when a NACK is sent has been. The first CQI feedback can then be sent earlier than in method 2, i.e. not only at time m as in 3 shown, but earlier, eg at time m-1 or m-2, in extreme cases even time m-3 is possible. The advantage is that the transmitter already has up to two, in extreme cases even 3 packets earlier (than e.g. in method 2) current channel status information and can noticeably improve data throughput, especially for shorter data transmissions. However, this improvement could also be used for method 1, which has not yet been described. [B. Raaf, this could later be written in an independent claim for method 1 if necessary]

It let yourself optionally a maximum number of CQI feedbacks at the beginning of a data transfer define. This variant is advantageous if the first, at the beginning of a data transmission sent CQI feedback is lost, i.e. not received correctly can be. Then the information is still by another sent CQI available at the transmitter. Alternatively, the time Distance to previous CQI feedbacks at the beginning of a data transfer is smaller chosen be as during an active data transmission. The beginning of a data transfer may of course not as the first TTI in which a data packet was transmitted after a predefined time no data packets were transmitted (inactivity time) To be defined. This state must be much more after this first TTI for a certain predetermined time (hereinafter called the hold time) continue to apply until then in the active data transmission state is changed (or possibly in the state no data transmission, if no more data packets were sent and the hold time larger than the inactivity time was chosen).

By checking for exceeding maximum distances in addition to the preceding and following cyclical CQI, the Shipment of unnecessary many feedbacks can be prevented. In particular, but also ensure that in the event of multiple transfers of a CQI feedback such retransmissions with the subsequent transfers the next determined channel quality information overlap. If the transfer conditions are such that the transfer a CQI feedback is not well secured in the uplink, the suggestion is that Send CQI feedback repeatedly, i.e. several times in a row exactly the same CQI feedback. The transmitter can then decode consider all received copies and is more likely to get the CQI feedback to be able to decode correctly, as if only one copy was available stood. Of course you cannot send a CQI feedback in every TTI, but e.g. with triple transmission at most every third TTI. But now in addition to the cyclical CQI feedback sent further CQI feedback, so there is the possibility that repeating a non-cyclical CQI feedback with a cyclic CQI feedback collides. This is disadvantageous because then either the additional CQI feedback or the cyclical CQI feedback is not repeated enough can and thus the detection of the CQI feedback is difficult. Around It is advisable to prevent this from occurring, the time interval between predetermined and additional To choose CQI feedbacks so that such a collision cannot occur. To do this, the time Distance should be chosen at least as large as like the number of repetitions. This setting of temporal Maxi Malt intervals let yourself even without consideration the state of activity the data transmission carry out, in other words, for all non-predetermined CQI feedback.

Also while an active data transmission are the transmitter the transmission times of the predetermined, in particular Cyclic CQI feedback known. Again, checking for maximum distances helps preceding and following predetermined, in particular cyclic CQI, the shipment of unnecessary lots of feedback, as well as an overlap of transfers avoid different CQI feedbacks.

Furthermore, by appropriate choice, this Intervals a priority of cyclic CQI feedbacks are secured. This is also indicated for reasons of backward compatibility with previous standard specifications. Maximum distances to the cyclical CQI feedbacks are defined for non-cyclical CQI feedbacks, whereas there are no restrictions for the cyclical CQI feedbacks.

In another embodiment are maximum distances between non-cyclical CQI feedbacks. These maximum distances have to on the one hand be at least as large as the number of repetitions of a single non-cyclical CQI feedback. On the other hand, however larger maximum distances can also be selected. For example, a maximum distance can be chosen so that maximum at Every third TTI a CQI feedback is sent, although every CQI feedback without additional Retries is sent. This prevents CQI feedback frequently be sent when the channel can change significantly. In this case, it would be superfluous to send a CQI feedback to each TTI.

This embodiment let yourself combine with all methods of sending CQI feedback, which at the beginning under the description of the prior art 1st to 4th listed have been. This combination would also be independent of the state of activity the data transmission.

In another embodiment it is determined that not every additional CQI feedback is sent , but only every nth, where n is a natural number, that is e.g. every third. If packets are sent to the terminal in every TTI, then this procedure is equivalent to the previous embodiment when using the activity-based CQI feedback (under procedure 1. Described), otherwise by this embodiment but generated less CQI feedback.

In another embodiment the first CQI feedback is provided at the start of a data transmission to be sent, but then only every nth additional CQI feedback. To this This way it is ensured that at the start of a data transfer quickly an updated value is available stands while the data transmission but only a few CQI feedback are sent and therefore less Interference is generated than in the prior art methods Technology.

It there is also the possibility that in the different states even different intervals for the cyclical CQI feedback chosen become. You can't just be shorter Intervals for times of data activity use aiming during the data transmission shorten the interval of cyclical CQI feedback. in the In contrast, the method proposed here can also be used the interval of cyclic CQI feedback during data transmission be enlarged, or the cyclical CQIs can be completely set. While of data activity stand additional CQIs available e.g. according to method 2 then when a NAK is sent, the one essential higher Correlation between change in reception quality and the time of the CQI feedback enable than the predetermined cyclical CQI feedback.

In summary This combination results in a very flexible instrument to control the CQI feedback. During inactivity on the Data channel can possibly be a cyclical CQI feedback information about the channel state of a subscriber can be obtained. At the beginning of a data transfer will be as fast as possible transmit an updated value, if there is not one in the immediate vicinity is. The explicit request for CQI feedback is due to the associated disadvantages, especially the resource allocation in downward direction waived. Furthermore, the implementation of the CQI feedback between different states of activity of the Data transmission channel distinguished, in particular the states "no active data connection", "start of an active Data connection "and" existence of an active Data connection "is used become.

S

Channel

R

receiver

CN

communication network

CH1

First channel connection

CH2

Second channel connection

DTX1

First data transfer

DTX2

Second data transfer

DTX3

third data transfer

CQI TX

Regular transmission of channel quality information

TS

time slot

MP

measurement period

TB

transport block

ON

feedback

Claims (14)

Method for data transmission via a data transmission channel (CH2) in a communication network (CN), which is made available between a transmitter (S) and a receiver (R) for wireless transmission and in which the data transmission takes into account the channel Quality is carried out, with the following steps: - repeated transmission of channel quality information (CQI-TX) from the receiver (R) to the transmitter (S); - Determining an activity state of the data transmission by the receiver (R); - determining a time interval (t delta) from the last transmission of channel quality information (CQI-TX); - Transmission of further channel quality information (CQI-TX) from the receiver (R) to the transmitter (S) when there is a first activity state and the time interval exceeds a specified first time interval. Method according to Claim 1, in which the transmitter (S) a base station and the receiver (R) is a terminal or vice versa. The method of claim 1 or 2, wherein the data transmission packaged. Method according to one of the preceding claims, which the activity state includes a first status in which the recipient (R) at least one data packet arrives or signals its arrival and a second state in which no data packet at the receiver (R) arrives and no arrival is signaled. Method according to one of the preceding claims, which is the first time interval depending on the activity status is set. Method according to one of the preceding claims, which the repeated transmission the channel quality information at predetermined times. Method according to one of the preceding claims, which the repeated transmission is at least partially cyclical. Method according to one of the preceding claims 6 or 7, at which the time interval to the next predetermined transmission of channel quality information is determined and if this time interval determines a second time interval falls below the transmission of the further channel quality information omitted. Method according to one of the preceding claims, which the predetermined times from a transmitter (S) in the form of a Base station and / or the communication network (CN) are predetermined. Method according to one of the preceding claims, which the channel quality information (CQI) about at least a measurement, especially immediately before a transmission of channel quality information (CQI) in the recipient (R) is determined. Method according to one of the preceding claims, which the communication network is a cellular network, which according to the UMTS Standard works and the data transmission method is HSDPA is. Terminal with a transmitter / receiver unit for transmission and receiving data about a Radio link and a processor unit, which is used to carry out a Procedure according to a of claims 1 to 11 is set up. Base station with a transmitter / receiver unit for transmission and receiving data about a Radio link, with a connection to a communication network and a processor unit which is used to carry out a method according to a of claims 1 to 11 is set up. Communication network with a terminal according to claim 12 and a base station according to claim 13.