EP1621037A2 - Data transmission method - Google PatentsData transmission method
- Publication number
- EP1621037A2 EP1621037A2 EP20040728573 EP04728573A EP1621037A2 EP 1621037 A2 EP1621037 A2 EP 1621037A2 EP 20040728573 EP20040728573 EP 20040728573 EP 04728573 A EP04728573 A EP 04728573A EP 1621037 A2 EP1621037 A2 EP 1621037A2
- European Patent Office
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- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 230000015572 biosynthetic process Effects 0 description 1
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- 238000004891 communication Methods 0 claims description 20
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- 230000003111 delayed Effects 0 description 1
- 230000001419 dependent Effects 0 description 1
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- 230000012447 hatching Effects 0 description 1
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- 239000010410 layers Substances 0 description 2
- 239000011133 lead Substances 0 description 1
- 238000005259 measurements Methods 0 description 9
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- 230000001702 transmitter Effects 0 abstract claims description 45
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
- H04W8/22—Processing or transfer of terminal data, e.g. status or physical capabilities
- H04W8/24—Transfer of terminal data
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/1607—Details of the supervisory signal
- H04L1/1671—Details of the supervisory signal the supervisory signal being transmitted together with control information
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
Method for data transmission
The invention relates to a method for data transmission over a Datenubertragungskanal in a communications network that is provided between a transmitter and a receiver via a radio route to the grouting.
The performance of a data transmission from a transmitter to a receiver depends largely on that current information is available posted for the transmission quality of the Datenubertragungskanals used at the transmitter at the right time. Only the transmitter Sendepara- meter can adapt for the data to be sent to the current situation in order to achieve satisfactory Ubertragungsergebnisse. As transmission parameters, for example, transmission power or modulation or coding scheme is considered. The current information posted for the transmission quality is obtained from so-called "tunnel measurements" or "channel estimations".
The problem is hereinafter described with an example from the UMTS standard (UMTS: Universal Mobile Telecommunication System). For Begriffsklarungen refer to the description of the figures.
UMTS-packet Hochgeschwindigkeitsdatenuber- was proposed transmission for a shared channel, known as HSDPA (High Speed Downlink Packet Access). The receiver is in this case a terminal, the transmitter is a base station. This HSDPA standard provides a slow signaling control information through higher layers of the OSI layer model before (0SI: Open System Interconnection) which control the channel measurements for HSDPA. As control information for these channel measurements, the time rate of the measurements, the temporal offset are mainly (postponement) relative to a reference and the number of repetitions in the transmission of a measured value used. This means that after the establishment of a radio connection or "Radio Link" fixed-rate measurements are performed (High Speed Downlink Shared Channel) to be sent regardless of whether and when actually information on the established for HSDPA common Abwart link data channel HSDSCH. Therefore, a lot of unnecessary measurements are on the one hand, under certain circumstances carried out, on the other hand, at the time of an actual Paketdatenubertragung, the so-called "Packet call" there are no current measurement. A Paketdatenubertragung may in this case consist of a plurality of individual packet calls that may again consist of a plurality of individual data packets in each case.
As a remedy has been proposed to extract additional information about the state of the radio channel from the power control. However, this is for the case that the terminal is in so-called soft Uber mode or "soft handover" is not possible because there are problems with the power control result. The term "soft handover", a state is meant in which a terminal is connected to multiple base stations. The power is controlled so that the mobile station or the terminal NEN the transmitted data with the aid of the received signals of all Basisstatio- can correctly received. but that does not, in general, that the terminal which sends the HSDPA data receives the signal of the particular base station correctly. Since the HSDPA data packets are only sent from said one base station to the mobile station provides the power control that is optimized for a set of base stations, satisfactory additional information. Therefore, the current channel information data for the solution of the problem were made the following proposals:
1. A so-called aktivitatsbasierte Kanalqualitatinformati- ons jerk message (activity-based CQI feedback CQI: Channel Quality Information). Here, the rate of cyclic measurements is then increased once it is established on Endgerat or terminal that data is being sent. In a Paketda- tenubertragung according HSDPA may in particular with each jerk message that a received packet could be decoded or not an additional channel information CQI message are sent. This jerk message may be for example a so-called "ACK" (acknowledgment) or "NAK" ( "No Acknowledgment"). Since a delay time between the detection of Datenaktivitat at the terminal, the implementation and transmission of the measurement and the reception and evaluation of the measurement at the transmitter so the base station is present leads, this disadvantageously means that for each Paketdatenubertragung the first packets without current channel information message or channel measurement must be transferred. Furthermore, an active data transfer by the increased transmitter are sent unnecessarily many channel information messages under certain circumstances while derate for the channel information message, thereby unnecessarily generates interference in the uplink.
2. A white ere possibility is to send an additional channel information message after receiving a NAK.
Here the same drawbacks as above described occur. 3. Another option was proposed to specifically request a channel information message. Thus, although let the problem of a lack of current information at the beginning of a data transmission without, however, explicitly signaled leads capitalization on the HS-SCCH, the control channel for HSDPA in an additional allocation of resources in the downlink direction. it is also disadvantageous that due to the explicit request operation is performed delayed Erstaussendung of the first packet of a Paketdatenubertragung.
4 Another method is that the terminal exactly then sends an additional channel information message if the terminal determines, for example, in the decoding, that the encoding or modulation scheme just applied is too good or too bad. This process ensures for already active data connections that sewer nalinformationsnachrichten right then and always take place when they are needed. A disadvantage of this is that the recipient of this channel information messages, ie HSDPA, does not know the base station, the times at which the channel information messages were sent. Thus, the detection and decoding these messages is difficult.
In summary, it is the common disadvantage of all these methods is that not at the same time a current Kanalinfor- mation is present and working resources.
Going out from this prior art, the object of the forward lying invention to provide a method for data transmission, in which a current Kanalqualitatsinformation is ensured with minimized resource allocation. This object is achieved by a method according to claim 1,4 and 5, further characterized by a terminal according to claim 18, a base station according to claim 19 and a communication network according to claim 20th
Advantageous developments can be found in the dependent claims.
The invention is based on the idea that a current possible Kanalqualitatsinformation present at the transmitter without Kanalqualitatsinformationen were transmitted unnecessary.
In a first alternative, in a method for wireless data transmission between a transmitter and a receiver in a communication system, a wireless Datenubertragungskanal is provided. That station adapted the data can tragungskanals sent to the current channel quality of Datenuber-, is from the receiver to the transmitter repeats a Kanalqualitatsinformation transmitted. The receiver or the transmitter determines a Aktivitatszustand the data transmission, thus for example whether current data is transmitted or its transmission is signaled, or if no data is being transmitted and no arriving of data is signaled. Furthermore, the time interval to a previous transmission is determined.
If this time interval exceeds a specific first time interval and at the same time a certain Aktivitatszustand, in particular the beginning or the presence of a data transmission is present, then a channel information message is transmitted to the receiver from the receiver. By the exceeding of the first time interval to another transmission is ensured that not too many unnecessary channel information messages are transmitted. Furthermore, such a method also has the advantage that the time at which a further Kanalqualitatsinformation is transmitted and so arrives at the transmitter, the transmitter is approximately known at least since this time is correlated with an action of the transmitter, namely for example the beginning of a data transmission.
In the first alternative, the first temporal distance is a maximum distance, above which the U bermittlung carried out a further Kanalqualitatsinformation.
As an alternative to determining a temporal minimum distance object can be determined that the transmission of the further Kanalqualitatsinformation only takes place when the determined Aktivitatszustand already existed n times. This has the advantage that the number of Kanalqualitatsinformation transmitted adapted if data transfers take place or can not be reduced.
Another alternative is to park in the transmission time that no collisions between individual transfers of Kanalqualitatsinformation occur.
Even so, can reduce the number of messages transmitted with reasonable Kanalqualitatsinformation the Ubertragungssi tua i on matches. Furthermore, this alternative has the
Must no minimum time interval are determined or defined benefit. The data transmission can in particular packets or a circuit-switched connection be intermittent. In such data transmission quality can be easily adjusted in steps.
According to an advantageous embodiment may be the communications network to a cellular network, in particular according to the UMTS standard. The transmitter can be minal around a fixed base station and the receiver is a mobile ter-. In particular, such a data transmission method let HSDPA apply.
Also, the terminal may constitute the emitter and the base station the receiver. This Datenubertragungsverfahren then let in particular to a high-speed transmission in the uplink from the terminal to the base station, such as HSUPA (high-speed uplink packet access) and EUDCH (Enhanced Uplink Dedicated CHannel) apply.
To adapt the transmission to the Aktivitatszustand of data transmission, the first time interval as a function can be determined by Aktivitatszustand. In particular, various Aktivitatszustande for the beginning of a data transmission and a serial data transmission and no "active" data transfer are provided. Active here means that not only control data but also user data are transmitted.
If no active data connection is provided, a certain first time is chosen distance. Then this may be ERS th time interval at the start of a data transmission reduced so that first current Kanalqualitatsinforma- functions available at the transmitter. then the data transfer is in progress, the first time interval may be increased to be raised again to the aforementioned, even greater value after the data transfer.
In particular, repeatedly, especially cyclically transmitting Kanalqualitatsinformation at certain times can be provided to be Added to the other, defined by the above conditions measurements. The timing for these repeated, in particular cyclic measurements may be specified by the communication network, resulting in unnecessary interference between about receivers, especially terminals can be avoided.
In an advantageous embodiment, the time interval to a subsequent transmission, the timing is already known, that transmissions at predetermined times, is detected if the time interval to the previous transmission exceeds the first time interval. As appropriate, this time interval exceeds a predetermined second time interval, a further transmission of Kanalqualitatsinformationen is performed.
This second time interval can be set in dependence on the activated vitatszustand of data transmission.
A wireless Datenubertragungskanal may be formed by a radio link or an optical transmission.
The invention further relates to a terminal and a base station and a communication network, which is performed with or by the this procedure. The invention is explained below with reference to examples, which are partially illustrated in the figures:
Figure 1 shows the schematic relationship between the transmitter, receiver and the network;
Figure 2 shows the timing of transmissions of Kanalqualitatsin ormation and data transmission;
Figure 3 shows the time sequence of a signaling in HSDPA.
Figure 4 shows the timing of the transmission of Kanalqualitatsinformation when only every nth Kanalqualitatsinformation is transmitted.
Terms initially used to be clarified before a detailed presentation of the figures:
In a communication system or communication network is a structure for data exchange. This may be, for example, be a cellular mobile network, such as the GSM network (Global System for Mobile Communications) or UMTS network (Universal Mobile Telecommunications System). A communication network environmentally combines two connecting nodes at least, so it falls so-called "point to point" connections under this concept.
In a communication system generally terminals and base stations are provided which pass over a radio interface with each other. In the UMTS system, the communi cations or Funkubertragungsnetzwerk at least base stations, here also called NodeB, and radio network controllers or radio network controller (RNC) for connecting the individual base stations. The terrestrial radio access network or see "Universal Terrestrial Radio Access Network" UTRAN is the harmful part of a UMTS network in which, for example, the radio interface is made available. A radio interface is always standardized and defines the totality of the physical and protocol-related specifications for data exchange, for example, the lead Modulationsverf, the bandwidth, the frequency, access method, backup procedures or switching techniques. So the UTRAN comprises at least base stations and at least one RNC. A base station is a central unit in a communication network that serves terminals or communication terminals within a cell of the mobile network via one or more Funkka--dimensional in the case of a cellular mobile radio network. The base station provides the air interface between the base station and terminal. It takes over the management of the radio operation with the mobile subscribers and monitors the physical radio link. In addition, it transfers the utility and status messages to the terminals. The base station has no switching function, special countries, only a supply function. A base station includes at least one transmitter / receiver unit.
A terminal can be any communication terminal through which communicates a user in a Kommunikatnonssystem. There are, for example Mobilfunkendgerate such as mobile phones or portable computers with a radio module below. A terminal is often referred to as "mobile station" (MS) or in UMTS "User Equipment" (UE), respectively. In mobile communications, a distinction is made between two connection directions. The caretaker connection or "Down Link" (DL) indicates the transmission direction from the base station to terminally. The Aufwartsverbindung or "uplink" (UL) refers to the opposite transmission direction from the terminal to the base station.
In Breitbandubertragungssystemen, such as a UMTS mobile radio network, a channel is a portion of a for
Grouting standing Gesamtubertragungskapazitat. As a radio channel is called a wireless communication in the context of this application.
In a mobile radio system, such as UMTS, are available for the transmission of data, two types of physical channels: dedicated channels or "dedicated channels" and shared or "common channels". When the dedicated channels, a physical resource for the Uber- transmission of information to a particular terminal is allocated. The common channels information can be transmitted, which are intended for all terminals, for example, the primary common physical control channel or "Primary Common Control Physical Channel" (P-CCPCH) in the downlink, or all terminals share a physical resource. This is the case with the HS-PDSCH, about to be sent to a terminal depending on the Verbindungsqualitat to the terminal data.
In mobile radio systems such as UMTS in addition to pipeline-mediated or "circuit switched" services where a connection is established during their time allocated, and packet-oriented or "packet-switched" Services vorgese hen. Circuit-switched services can also be carried out intermittently.
1 shows a sender S and a receiver R can be seen in a com- munikationssystem CN. The transmitter S sends data to the receiver R via a first connection channel CH1. The receiver R may, for stations S send data over a second channel connection CH2.
The sender S can for example be a base station, the receiver R a terminal. In the communication network system may, for example, a system according to the UMTS, the GSM act or other standards. The first channel CH1 compound may include multiple channels, for example a data transmission channel for transmitting user data or "load bits" as well as a control channel for transmission of control information. The second channel connection CH2 may include only a control channel or as the first channel CH1 connection consist of a control channel and a channel Datenubertragungs-.
For transmission of user data over the Datenubertragungskanal the first channel link CH1 from transmitter to receiver, it is important that the channel quality of this data is known transmission channel. To determine the recipient, so for example the terminal, from data of the first channel connecting a Kanalqualitatsinformation or "Channel quali- lity information" CQI.
The receiver R may detect these Kanalqualitatsinformation also from data of general control channels. In the case of HSDPA was located here, for example to the general pilot channel CPICH (Common Pilot Channel) act. This Kanalqualitatsinformation or "Channel Quality Information" CQI is transmitted from the receiver R to the transmitter S, bond, for example, over the control channel of the second Kanalver- CH2.
Now it is important for the data transmission via the first channel connection that a time as close as possible Kanalqualitatsinformation CQI is present at the transmitter S. At the same time should not be sent unnecessarily Kanalqualitatsinformation CQI as this, as has been said, leads to interference. It is therefore proposed a timing of transmission of this Kanalqualitatsinformation CQI in the invention.
2 shows an example of this temporal coordination with the boundary condition can be seen that there are regular, predetermined communications Kanalqualitatsinformation the CQI. 2 shows a labeled T timeline now shows that regular transfers CQI-TX will take place at certain times. It will now take place a first data transmission DTX1. For this purpose, it is determined whether the time interval between the first data transmission t_delta DTX1 and a regular transmission of CQI TX larger than a predetermined first time interval is. If this is the case, then the transmitter sends to the receiver in addition the Kanalqualitatsinformation CQI.
whether a temporal minimum distance to the previous or to the next measurement is known generally exceeded out is checked. This can be seen at the second data transmission DTX2 where the time interval is the delta t 'determined for the fol lowing Kanalqualitatsinformationsubermittlung CQI TX.
A data transmission can, as tenubertragung reference to the third DA DTX3 shown over several regular channel qualitatsinformationsubermittlungen CQI TX extend. During the period of transmission ensures that no more transmission of Kanalqualitatsinformation takes place, which will take place temporally close to regular transmissions.
To distinguish the state "start of a data transmission" and "existence of a data transmission" let the time period from the time the last transmission of a data packet or the length use the break at a Paketdatenubertragung or a discontinuous transmission leitunvermittelten. When this period is greater than a predetermined value, which is referred to below Tnaktivitats time, this marks the "beginning of a Datenuber- transmission". Hence a transition criterion between the two states is specifiable.
This Inaktivitats time is preferably greater than a Rundlaufverzogerung or selected "round trip delay". Under a round trip delay is the time that is needed to decode a message sent from a sender message to the receiver to notify the transmitter, the result of this decoding, the transmitter then decoded again and then the message further in dependence on this result send times.
The choice of time period greater than one round trip delay has the following background: Requires the last packet of Pa ketdatenubertragung or a "packet calls" due to insufficient reception quality multiple transfers, then carried it always with a time interval of at least one round trip delay amounts, since the sender of the data packet can not know beforehand that the package could not be received. Now, if the period of large chosen as a round trip delay, then the case of the repeatedly transmitted packet data transmission is referred to not mistakenly as the beginning of a new data transmission. Are used, this restriction may be especially for HARQ (Hybrid Automatic Repeat re quest) method is used, for example for HSDPA. There, the round trip delay typically amounts to six transmission time intervals or "transmission time inter- vals" TTI. A TTI specifies HSDPA specifies a time interval in-nerhalb which a base station transmits to a terminal. The round trip delay also depends on the reaction rate of the base station from which is not standardized, in contrast to the reaction rate of the mobile station, but depending on the Fahigkei- th from any vendor implementation used as described can be selected. Therefore, it may be necessary to choose the length of time depends on when the currently used base station and communicated to the mobile station. Further, terminals are provided, which can not receive data over HSDPA in each transmission time interval TTI. In this case, the Inaktivitats time is preferably adapted to the resultant change in round trip delay.
In the following the invention by way of examples in
HSDPA explained in more detail. However, the invention is also, for example, at a corresponding Hochgeschwindigkeitsubertra transmission method in the uplink use, for example, a method according to HSUPA or EUDCH.
In Figure 3, the timing of the signal capitalization is seen in HSDPA. In the downlink direction control information is sent to the so-called common Hochgeschwindigkeitskontroll- channel HS-SCCH or "high-speed shared control channel". Two time slots or "Time Slots" later begins to transfer the actual data or useful data on the associated Datenubertragungskanal, the physical construction geschwmdigkeitsabwartsverbindungskanal HS-PDSCH or "High Speed Physical Downlink Shared Channel". By an arrow is indicated, when the jerk associated message on correct decoding (ACK) or not correct decoding (NAK) is carried out by the terminal in the uplink to the base station. This confirmation or jerk message is marked in the drawing with a running index n and by hatching. The duration of the measurement of the data for the CQI Kanalqualitatsinformation mode is being called measurement period MP.
The second arrow from the back message that n in the HS-DPCCH for HS-SCCH indicates the time from which this acknowledgment at the transmitter so the base station is again present and can thus be effected an appropriate response to the HS-SCCH. The
Dates from which a reaction is possible are grayed out when HS- PDSCH and HS-SCCH.
In this Ausgestal clothes three different approaches will now leave for transmission of Kanalqualitatsinformation or "CQI feedback" is used: 1. From the predetermined communication network, in particular cyclically recurring CQI feedback. The predetermination may in particular be carried out by a central unit, such as base station or RNC. A predetermination by the Basissta- tion has the advantage that the radio traffic in particular in terms of interference within a radio cell simply regulate let; at a settlement with the RNC also a provision in regard to several radio cells SUC can gen. 2. Ask for additional CQI feedback at the start of a data transmission
3. Ask for additional CQI feedback during an active data transfer.
For the occasion 2 and 3 time distances are defined now upwardly specified proviso that determine which temporal distance CQI feedback should have from these starting at least to the cyclic CQI feedbacks. Optional can be controlled to predetermined CQI feedbacks are transmitted with priority. This priority can be fixed flat rate, for example, by termination, moving or temporary prohibition of CQI feedback according to the 2nd and 3rd. Alternatively, the priority as a function of parameters relating to the data traffic to be controlled.
Tn the difference cozy states can be selected different conditions for the transmission of CQI feedback. For example, CQI feedback can be sent immediately at the beginning of a data transmission after the ter- minal detects this condition, whereas otherwise only (for example, according to the method 2 of the prior art) CQI are sent only feedback when a NACK was sent. The first CQI feedback can be sent earlier, earlier, for example, at the time m-1 or m-2, in extreme cases, as in Method 2, not only at the time m as shown in Figure 3, but even the time m -3 possible. The advantage is that the transmitter has one or two, even three packets earlier grouted in extreme cases (as for. Example, in method 2), a current channel state information and the data throughput can especially remarkably be improved for shorter data transmissions. However, this improvement could also be applied to the process one that has not yet been described. This process led also to process one combine, both alone and in combination with additional other exemplary embodiments, it let itself optionally define a maximum number of CQT feedback at the beginning of data transmission. This embodiment variant is advantageous when the first, sent at the beginning of a data transmission CQI feedback is lost, that can not be correctly received. Then is the domestic formation but by another sent CQI to the transmitter at your disposal. Alternatively, the temporal distance to the preceding CQI feedbacks can be selected to be smaller at the beginning of a data transfer, as during an active data transmission. The beginning of a data transmission may thereby lent natural not in which a data packet has been transmitted as the first TTI, after a predetermined time no data packets (Inaktivitats time) were transmitted can be defined. Much more, this state has for a certain predetermined time after this first TTI (hereinafter referred to as hold time) WEI ter apply, until then goes into state active data transfer (or possibly no data transmission in the state if no further more data packets sent and the hold time greater than the Inaktivitats time has been selected).
By checking on exceeding minimum distances to the preceding and following cyclical CQI, the sending unnecessarily large number of feedback can be prevented to-satzlich. In particular, but let's order also ensure that there is no overlap qualitatsinformation with subsequent broadcasts of the next determined channel in the case of multiple transmissions of a CQI feedback such Wiederholungsubertragungen. When the Ubertragungsbe- conditions are such that the transmission of a CQI feedback in the uplink is not well secured, so there is repeatedly transmit the CQI feedback, so several times in succession exactly the same CQI feedback of the proposal. The transmitter can be considered copies then in the decoding of all received and therefore has a better chance of being able to decode the CQT feedback correctly than if only one copy for hours at your disposal. Of course, you can not then send in each TTI a CQI feedback, but eg triple sending more than every third TTI. Will now still be sent in addition to the cyclical CQI feedbacks further CQI feedbacks, there is a possibility that a repetition of a non-cyclical CQI feedback colliding with a cyclical CQI feedback. This is disadvantageous üg because either the additional CQI feedback or cyclical CQI feedback then can not be repeated often enough and thus the detection of the CQI feedback is difficult. To prevent this, it is advisable to choose the time interval between predetermined and additional CQI feedback so that such a collision can not occur. For this purpose, the time interval must be selected at least as large gew such as the number of repetitions. This definition of time loan maximum intervals let also drove through without considering the Aktivitatszustandes of data transmission, so for all non-predetermined CQI feedback.
Also, during an active data transmission, the transmission timings of the predetermined, in particular cyclic CQI feedbacks are known to the transmitter. Again, the verification helps to minimum distances to the preceding and following predetermined, in particular cyclic CQI to avoid the unnecessary transmission of many feedbacks, as well as an overlapping of transmissions Uber- different CQI feedbacks.
Further, a priority of cyclic CQT feedback can be secured by a suitable choice of these distances. This is indicated, among other things, for reasons of Backward-compatibility with earlier standard specifications. Here, minimum distances are defined to the cyclical CQI feedbacks, whereas apply to the cyclical CQI feedbacks no restrictions on non-cyclical CQI feedbacks.
In a further exemplary embodiment minimum distances are also provided between the non-cyclic CQI feedbacks the advertising. These minimum distances must 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, larger minimum distances can be selected. For example, a minimum distance can be chosen so that a maximum or at most every third TTI a CQI feedback is sent, although each CQI feedback is transmitted without additional repetitions. This prevents CQI feedback are sent more frequently than the channel can significantly other. Tn this case, it would be superfluous to send a CQI feedback in each TTI. This exemplary embodiment let be combined which have been initially been charged under the description of the prior art under 1 to 4 with all procedures for sending CQI feedback. Also this combination would be independent of the Aktivitatszustande data transmission.
Tn a further exemplary embodiment that not every additional CQI feedback is sent, but only every n-th, where n is a natural number, eg every third is determined. If sent in each TTI packets to the terminal, then this method is equivalent to the previous exemplary embodiment of using the activity-based CQI Feedback (under process 1 described), otherwise be this exemplary embodiment, but generates less CQI feedbacks. This situation is illustrated in Fig. 4. the boundaries of a sub-frame or sub-frame or "subframes" SF are on a time axis t characterized by markings.
The predetermined first time interval corresponds to a period T, which corresponds to the length in Fig. 4 by 3 subframes.
It is now found that a particular first Aktivitatszustand exists, for example, a current transmission. The time points at which this first Aktivitatszustand AI is present are indicated in Fig. 4 by arrows. In the example shown in Fig. 4 an additional exemplary embodiment Kanalqualitatsinformation is only transmitted as part of a message CQI '-TX when the Aktivitatszustand 3- occurred times. Instead of the number 3, any other arbitrary natural number can be selected. This additional condition that the Aktivitatszustand has occurred N times, the transmission of the Kanalqualitatsinformation can be more flexibly adapted to the current Ubertragungssitua- tion and especially not weitere- un- dingt required Ubermittlungskapazitaten be saved.
In a further exemplary embodiment is provided to transmit at the beginning of a data transmission, the first CQI feedback, but then only every n-th additional CQI feedback. In this way it is ensured that an updated value is fast for disposal at the beginning of a data transfer during the data transfer but few CQI feedback is transmitted and therefore less interference is generated, as in the processes of the prior art. This exemplary embodiment, let for example be realized in that the period T measured since the last transmission of the last CQI feedback, and in addition the number of occurrence of the considered Aktivitatszustandes. In contrast to the previous exemplary embodiment, a CQI feedback is not sent when both the time period T and the number of occurrence of the considered Aktivitatszustandes exceeds a predetermined threshold, but even if only one of these parameters exceeds the threshold. During a data transfer, the time Liehe threshold will not be exceeded, but the number of the occurrence of the considered Aktivitatszustandes. The beginning of a data transmission will generally be characterized in that no data was transmitted previously for some time and that the considered Aktivitatszu- was not occurred. This is only one possible implementation of this exemplary embodiment. There is also the possibility that in the various states even different intervals are chosen for the cyclic CQI feedback. Not only can you use shorter distances for times of Datenaktivitat to shorten with the aim during the data transmission, the interval of the cyclical CQI feedbacks. In contrast, also the interval of the cyclic CQI feedback may be increased during the data transfer with the method proposed here, and the cyclic CQIs can be all set. During the Datenaktivitat are additional CQIs for
Grouting, then, for example, when a NAK is sent by the process 2, which allow a much higher correlation between change in the reception quality and the time of the CQI feedback than the predetermined cyclic CQI feedback.
In summary, results from this combination a highly flexible instrument for controlling the CQI feedback. While inactivity on the data channel can gegegbenenfalls by cyclical CQI feedback information about the channel assignment was a participant be obtained. At the beginning of a data transfer, an updated value is transmitted if no one is present in close temporal proximity as quickly as possible. At the explicit request for a CQI feedback in particular the resource allocation in the downlink direction is omitted because of the associated disadvantages. Furthermore, a distinction is made in the implementation of CQI feedbacks between different Aktivitatszustanden of Datenubertragungskanals, wherein in particular the state of use "no active data link", "start an active data connection" and "existence of an active data connection". It may also be considered a further Kanalqualitatsinformation (CQI TX) from the receiver (R) to the transmitter (S) to be transmitted, if either a first Aktivitatszustand is present and the time interval (t_delta) were carried out to the last transmission of Kanalqualitatsinformation (CQI TX exceeds a predetermined first time interval, or a first Aktivitatszustand is present and this state is already n times occurred.
LIST OF REFERENCE NUMBERS
CN: communications network
CH1: Channel One Connection
CH2: Second channel connection
DTX1: First Data Transfer
DTX2 Second data transfer
DTX3 Third Data Transfer
CQI TX: Regular submission of Kanalqualitatsinformation
TS: time slot
MP: Measurement Period
TB: Transport Block
AN: Jerk message
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|DE2003120156 DE10320156A1 (en)||2003-05-06||2003-05-06||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|
|DE200410005714 DE102004005714A1 (en)||2004-02-05||2004-02-05||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|
|PCT/EP2004/050576 WO2004100589A2 (en)||2003-05-06||2004-04-21||Data transmission method|
|Publication Number||Publication Date|
|EP1621037A2 true EP1621037A2 (en)||2006-02-01|
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|Application Number||Title||Priority Date||Filing Date|
|EP20040728573 Withdrawn EP1621037A2 (en)||2003-05-06||2004-04-21||Data transmission method|
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|US (1)||US7593363B2 (en)|
|EP (1)||EP1621037A2 (en)|
|WO (1)||WO2004100589A2 (en)|
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