CN1981455A - Method for receiving data sent in a sequence in a mobile telephony system with radiopockets - Google Patents

Abstract

The invention particularly relates to methods for receiving data sent sequentially from a first transmitter (B1) of a mobile radio system on a first resource element (f1) to a receiver (UE), reception gaps occurring during reception. According to said methods, data (b) not received during said reception gaps is reconstructed by the receiver, the data not received from the first transmitter being received in a delayed manner by a second transmitter (B2) on the same resource element between the reception gaps and being used for reconstructing the sequence of data. Implementation is particularly advantageous for carrying out a reception method in the UMTS compression mode process when receiving data that is sent continuously without taking into account the compression mode.

Description

Method for receiving data transmitted in sequence with reception gaps in a mobile radio system

The invention relates to a method for receiving sequentially transmitted data with reception gaps in a mobile radio system according to the features of the preamble of claim 1, involving sending a signal from a transmitter to at least one in such a mobile radio system. Method for transmitting a data sequence by a receiver, relating to a receiver having the features of the preamble of claim 14 and to a communication system according to the features of the preamble of claim 15 having at least two transmitters.

In mobile radio systems, for example in accordance with the Universal Mobile Telecommunications System (UMTS) standard, a communication link is established between a mobile subscriber station (UE: User Equipment) and a base station (Node B) via a radio interface. In order to support the mobility of a subscriber station, the subscriber station must constantly measure in terms of a possible handover to another base station. Such measurements are made both in the idle state (idle) and in the connected state (connected mode connection mode). The so-called compressed mode (compressed mode/CM) is therefore introduced in UMTS in the FDD (Frequency Division Duplex) mode of operation, so that even during the presence of a connection to the assigned channel (Dedicated Channel/DCH) Subscriber station inter-frequency measurements and inter-radio access technology (Radio Access Technology) measurements are performed without a second receiving device. For example, handover measurements to the GSM radio access network (GSM: Global System for Mobile Teltcommunication) can be performed with only one receiving device while a connection is present. According to current specifications, different types of compression modes can be configured via the network. The first mode of operation is called "Uplink in CM only (UL-uplink connection)". This mode of operation for an uplink connection only in compressed mode is advantageous, for example, if the terminal or subscriber station is equipped with a second receiving device, but such a subscriber station has to be implemented, for example, in the GSM1800 frequency band close to the UMTS frequency band. To measure, an existing connection to the first receiving device is maintained on the UMTS frequency band. In such a case, the continuous transmission of the subscriber station on the assigned UMTS channel (UE UMTS DCH transmission) would be strongly disturbed by the GSM measurements performed with the second receiving device.

The second operating mode is used for the compressed operating mode of the uplink and downlink and is also referred to as UL/DL CM (DL: Downlink Downlink). This mode of operation serves to avoid the need for a second receiving device in the subscriber station and also for avoiding the need for a second combiner. If a single receiving station with two combiners is used, for example for inter-RAT measurements in the GSM900 band (GSM900 Inter RAT measurements), then it is possible to use the The third operating mode of DL") in .

FIG. 2 shows the principle of the compressed mode of operation. The data is transmitted over a plurality of frames fr (frame), wherein in this case between one and a maximum of seven time slots per frame fr can be occupied by the subscriber station for the measurement. These time slots are either in the middle of a single frame fr or distributed over two frames fr. In the compressed frame frc the transmission power P is increased and thus the connection quality is kept constant. Such a compressed frame thus consists of compressed data cd and gaps G. During gap G the subscriber station can perform measurements on other resources, in particular on other frequencies. Which frames fr and frc are compressed is determined by the network or communication system. The compressed frame frc can be determined periodically or on request. The rate and type of compressed frame frc is variable and depends eg on the kind of measurements made by the subscriber station. The structure of the compressed operating mode is assigned to certain subscriber stations, wherein the structure generally differs between different plurality of subscriber stations within the cell. In the compressed mode, the data are thus transmitted in frames, wherein such a frame frc as compressed frame frc has a transmission gap G in which no data is transmitted.

In addition, multimedia radio broadcast transmissions and so-called multicast services (MBMS: Multimedia Broadcast and Multicast Service, Multimedia Broadcast and Multicast Service) are provided for such communication systems, which are services in which the base stations are Information of general interest is transmitted on a commonly used channel. This commonly used channel is listened to by a plurality of subscriber stations. The general signal can be similar, for example, to video text in television or content transmitted via DAB (Digital Audio Broadcasting), but also includes services such as multimedia. For example, a goal of a soccer match can be transmitted via a single channel via such a service to many subscriber stations. In the case of transmission via such channels, however, a continuous transmission without transmission gaps is planned. In the case of MBMS, no corresponding transmission slots are provided at the transmitting station during the reception slots at the receiving station, so that data loss occurs during the reception slots.

Therefore, with the introduction of MBMS for UMTS, there arises a problem that the physical channel (S-CCPCH) for MBMS does not support compressed mode of operation (CM). In the case of a subscriber station in an assigned connection, it is evident that at the moment when said subscriber station performs a measurement in the compressed mode of operation, the data transmitted in the corresponding S-CCPCH frame at this time will be lost data. This results in the loss of MBMS data transmitted in continuous sequence over the channel S-CCPH. Here, the amount of lost data depends on the length of the slots, the frequency of the slots and the number of active CM sequences in the subscriber station.

Figure 3 shows an example of a data structure, showing in the upper diagram how the subscriber station via the so-called DPCH channel (DPCH: Dedicated Connection in CM, dedicated connection in CM) in compressed mode of operation via the assigned connection Receive the data structure. In the diagram below it is shown what is or is not received by the subscriber station as a receiver when receiving continuous data via such a radio broadcast channel S-CCPCH in operation with reception gaps when receiving MBMS data. The subscriber station performs various measurements, such as measuring the signal strength of the GSM signal (GSM RSSI: Received Signal Strength Indicator, received signal strength indicator). Further measurements are carried out, for example, on the base station identity code BSIC and on the FDD frequency shift. Obviously, if the subscriber station has only a single receiving device and therefore has to switch the receiving frequency, data on the channel S-CCPCH will be lost during this measurement time.

A similar problem arises if the subscriber station is in a forward access channel state (CellFACH (Forward Access Channel) state) of a cell in which the subscriber station is assigned a universal subscription An uplink transmission channel used separately or separately, for example, a direct access channel RACH (Random Access Channel) that the subscriber station can use for the access process at any time. The access to the FACH of the cell is characterized in that the position of the subscriber station is relative to the UMTS Terrestrial Radio Access Network (UTRAN: UMTS Terrestrial Radio Access Network) with respect to the cell in which the subscriber station last underwent a cell update procedure Known at the cell level. In this state, no permanently allocated channels are assigned to the subscriber station and no measurements are required in accordance with the compressed mode of operation. However, the subscriber station must continuously monitor the FACH in the downlink direction and periodically perform inter-frequency and inter-RAT measurements. The duration of the measurement process corresponds to the duration of the maximum transmission time interval (TTI: Transmission Time Interval) on the channel S-CCPCH used for radio broadcast information or MBMS, which can be observed by the subscriber station, where every 2 ^k The measurement process is performed according to the currently specified TTI transmission time interval of 80 ms, where k=1, 2, 3. With a TTI measurement duration of 80 ms as the longest duration, depending on the selection of the k value, there are measurement periods of 160 ms, 320 ms or 640 ms. For clarity, Figure 4 shows an example of a subscriber station in the so-called cell FACH state for k=2. In the case that inter-frequency measurement and RAT measurement are required, the subscriber station interrupts MBMS reception on the corresponding channel S-CCPCH every 320 ms.

A disadvantage of all these methods is that, in the compressed mode of operation, the subscriber station can only partially receive the data transmitted continuously and continuously on the channel S-CCPCH. Various solutions to the problem are currently being investigated. One variant consists in that the transmitter, which is aware of the gap at the receiving subscriber station, simply interrupts the MBMS transmission during this time and performs a discontinuous transmission (DTX: Discontinuous Transmission).

Another solution consists in that the subscriber station attempts to reconstruct the missing data on the receiver side, for example by decoding with Forward Error Correction (FEC: Forward Error Corretion), for example by means of the known Tutbo decoding method and embedding Sets (Interleaving) method. However, these solutions are problematic because the measurement slots of different subscriber stations on the receiving side that are located in the cell and receive the MBMS data are not aligned in time with one another. The corresponding structure of the slots is measurement-specific, that is to say depends on the manner in which the measurements are carried out by the subscriber station, that is to say for example on inter-frequency measurements or inter-RAT measurements, wherein this also depends for example on the The location of the subscriber station within the cell.

The current preferred solution is that the inter-frequency measurement or inter-RAT measurement is implemented by the subscriber station using discontinuous reception (DRX: Discontinuous Reception) during MBMS reception. In this case, the MBMS data are transmitted and transmitted without interruption, wherein the individual receiving subscriber stations simply lose MBMS data that were not received when the inter-frequency and inter-RAT measurements were carried out. By employing forward error correction, the subscriber station must attempt to reconstruct the missing data.

The object of the present invention is to provide an alternative and preferably improved method for receiving a sequence of transmitted data with a reception gap during reception, or to provide a correspondingly suitable method for transmitting a sequence of data. Method, a receiver and a corresponding communication system.

This task is achieved by a method for receiving data transmitted in a sequence according to the features of claim 1 , by a method for transmitting a sequence of data according to the features of claim 2 , by a method according to the features of claim 14 A receiver for a mobile communication system, and a mobile radio system arrangement according to the features of claim 15.

Accordingly, a method is preferred for receiving by a receiver data transmitted in sequence by a first transmitter of a mobile radio system on a first resource element of a resource, wherein a reception gap occurs during the reception and, during the reception gap The non-received data is reconstructed by the receiver, wherein the non-received data from the first transmitter is offset in time or shifted (verwuerfelt) from the second transmitter on the same resource element of the resource in the reception gap are received and used to reconstruct the sequence from the data.

Accordingly, as an alternative or in combination, a method is preferred for transmitting a data sequence from a transmitter to at least one receiver via resource elements of a resource in a mobile radio system, wherein the mobile radio system has a A second transmitter of a transmission area whose transmission areas of the transmitters overlap, wherein the transmission of data via the first transmitter is performed offset in time or shifted with an offset. The second transmitter is on the same resource element The data is sent such that at the receiving side it is possible to reconstruct data that was not received when receiving data from the first transmitter due to reception gaps on said resource elements.

Accordingly, a receiver for a mobile radio system is preferred, which has a receiving device for receiving a data sequence transmitted by a transmitter on a resource element of a resource, wherein the receiving device briefly interrupts the data sequence on the resource element The resource elements are replaced for a short period of time by the reception on , whereby reception gaps occur, wherein data not received during the reception gaps are received from the second transmitter offset in time and processed to reconstruct the data sequence.

Accordingly, a mobile radio system arrangement of a mobile radio system is preferred, which has at least two transmitters with at least partially overlapping transmission areas, which transmit data sequences, wherein the transmitters are designed as The data are each transmitted using the same resource elements of the resource, wherein the transmission of one of the transmitters is configured to transmit the corresponding data element or data block offset or offset compared to the other transmitter A single data element or data block.

Advantageous developments of the invention are the subject matter of the subclaims.

Particularly preferred is a method in which transmitting and receiving frequencies, in particular frequencies of an FDD mobile radio system or an FDMA mobile radio system, are used as the resource elements.

Particularly preferred is a method in which the reception gap occurs on the receiver side due to a brief changeover of the resource element to another resource element of the resource.

Such a solution can also be transferred to other data loss situations, for example when the individual data of the data sequence cannot be received due to interference, for example in the second receiving device and the effective measurement is in an adjacent frequency band with a higher interference influence in the case of. The method can also be transferred in the case of external disturbances due to external disturbance sources.

A method is particularly preferred, wherein the mobile radio system is a communication system with resource elements for transmitting data sequences for a duration, and the at least one receiver is briefly used for another reception on one resource element is aborted and thus causes the reception gap.

Particularly preferred is a method in which the data sequence (in particular the data block) when sent by the second transmitter corresponds to a data sequence with a limited number of elements compared to the data sequence when sent by the first transmitter. The block is swapped. Such an exchange, that is to say a permutation, can be carried out periodically or randomly in some areas.

If the transmitters are synchronized, for example within a sector of a cell, then simply periodically exchanging as small as possible partial data areas prevents that there is no time for the same data to be transmitted by several transmitters. The memory required to sort the data is small. Furthermore, a simple rearrangement is possible as long as there is a data packet with a packet number identifying the sequence. Cross-correlation between a received data sequence with missing data elements and a data sequence from another transmitter can also be performed if only the sequence of individual data elements remains unchanged over time (Kreuzkorrelation ) to compare if the corresponding data element is found.

Preferably, the mobile station is informed of the shift or shift employed by neighboring stations. This can be done either explicitly by signaling or implicitly by another identifier, for example the transmitting cell identity ID. For example, the applied shift can be calculated from the cell ID modulo the maximum shift value, or the number of permutations used for shifting can be calculated from the cell ID modulo the number of permutations used.

However, if the transmitters are not synchronized, a purely periodic exchange is preferably not performed, since this cannot prevent any random passage of time between the two transmitters without the fact that both transmitters transmit at the same time the same data. In this case, a particularly random permutation of the smallest possible data subfields is possible, so that the memory required for the reordering in the receiving device is still small.

Especially preferred is a method in which the offset of an element or block of data when sent by the second transmitter with respect to the element or block sent by the first transmitter corresponds to at least twice the reception gap length of time.

Particularly preferred is a method, a receiver or a mobile radio system arrangement for carrying out a method according to the UMTS compressed mode method while receiving data transmitted continuously and regardless of the compressed mode. Receive method.

Especially preferred is a method, a receiver or a mobile radio system arrangement in which the first and the second transmitter are transmitters of two sectors of a single transmitting station.

Particularly preferred is a method, a receiver or a mobile radio system arrangement in which the offset enables immediate reconstruction, in particular not exceeding the duration of one frame.

The offset is either zero eg with respect to a sector of a cell, or is completely arbitrary. The periodic exchange does not involve the entire data flow, but only a part of the data flow, in particular a part which is as small as possible.

An exemplary embodiment is explained in more detail below with reference to the drawings.

Figure 1 schematically shows intercommunicating stations of a mobile radio system;

Fig. 2 shows the data structure of the compression operating mode according to the prior art;

FIG. 3 shows the receiving structure of the receiver for measurements in the compressed mode and the application of the compressed mode to continuously transmitted data.

FIG. 4 shows a diagram of the received data in the case of a cellular mobile FACH reception operating mode.

Selective combining reception (SC: Selective Combining) is preferably performed by the subscriber station UE. For this purpose, the same data content, that is to say the same data or data packets, is transmitted from more than one base station to the subscriber station in adjacent sectors and/or cells. No restrictions are imposed here with regard to the synchronization of the data itself. In known approaches, for example in the compressed mode according to UMTS, the subscriber station performs inter-frequency or inter-RAT measurements and cannot receive all data on the MBMS channel. However, the data that were sent but not received during the measurement or reception gaps are reconstructed. In addition to the well-known possibility of Forward Error Correction (FEC), this is done by sending the described Data or data packets. Data not received by the subscriber station during the reception gap can thus be received from adjacent cells or adjacent sectors via the same resource at staggered times and used for reconstruction.

FIG. 1 schematically shows an arrangement of different devices of a mobile radio system, for example according to UMTS, and the data transmitted therein between stations. In principle, however, transmissions to other mobile radio systems and possibly other operating modes are possible with comparable problems. In particular, instead of using two separate base stations B1 , B2 with their own respective cells c1 or c2 , it is also possible to use a single base station with sector antenna arrangements and sector cells.

Specifically shown are, for example, three base stations as transmitters B1, B2, B3. These three base stations are connected to a central control device CC and are controlled centrally with regard to the transmission of data and the establishment of communication links. Such a central control device in UMTS may be a so-called RNC (Radio Network Controller, radio network controller).

The subscriber station functions as a receiver UE and is located in the overlapping area of the cells c1, c2 of the first or second transmitter B1, B2. There is a dedicated connection between the receiver UE and the first transmitter B1. The receiver UE is in an operating mode in which data is received from the first transmitter B1 with the first frequency of the first resource element f1 being predominantly used as the resource frequency of the FDD method. In the interim, the receiver UE briefly switches to the second resource element f2 , that is to say to the second frequency, in order to perform measurements there. Data b of the sequence of data a, b, c, d, e transmitted by the first transmitter B1 via the first frequency f1 cannot be received during this time. The data sequences a-e are data elements or data blocks which are to be transmitted by the first transmitter B1 via a radio broadcast channel using the first frequency as the first resource element f1 to a plurality of receivers UE on the subscriber side. The receiver UE is thus, for example, a subscriber station operating in the compressed mode of UMTS which receives MBMS data from the first transmitter B1.

Furthermore, the receiver UE is still within the effective radius of the second transmitter B2. Said second transmitter B2 transmits the same data of the data sequence a-e to receiver UEs within the range of its cell c2. In order to be able to compensate for the reception gaps of the receiver UE due to its compressed operating mode, the second transmitter B2 uses preferably the same resource offset in time, for example shifted, for the corresponding transmission by the first transmitter B1. Element f1 (ie with the same first frequency) transmits these data of the data sequence a-e. There is thus a high probability that the receiver UE will be able to receive the missing data b due to the temporal shift of the second transmitter B2.

The shifting can function in various ways. In addition to transmitting the individual data elements or data blocks of the data sequence a-e over time by the two transmitters B1, B2 at different points in time, it is also possible to carry out all the steps when transmitting the individual data elements or data blocks of the data sequence a-e. exchange in the order described. Such an exchange can be performed periodically or randomly.

The duration of the reception gap is preferably taken into account when selecting the offset of the offset transmission data by the second transmitter B2. The offset is correspondingly selected to be greater than the duration of a reception slot. An offset of at least twice the receiving gap is particularly preferred.

In a further development, the offset is chosen at least so large that it corresponds to the current time lapse or the sum of the maximum time lapses between the reception slot and two adjacent transmitters. It is then ensured that reception gaps do not impair the reception of data packets not originating from these two transmitters.

Advantageously, such a solution also takes into account the transmission power loss on the part of the transmitters B1, B2 when transmitting the data of the data sequence a-e via the MBMS channel in order to reduce the required power. This is also made possible by selective selection of data from different transmitters on the receiver side. In the case of MBMS, the transmission of data a-e of different adjacent and mutually overlapping sectors or cells c1, c2 is co-ordinated by the network, for example a central controller CC. However, the synchronization requirements for selective combining to be carried out in this way are not very stringent compared to maximum ratio combining in the area of at least some TTIs.

In the case of aligned or synchronized transmissions eg within sectors of a cell, the reconfigurability is advantageously increased on the part of the receiver UE by exchanging the data to be transmitted in a pairwise permutation. For example in the case of such a pairwise permutation the first transmitter sends the sequence {a, b, c, d, e, f}, while the second transmitter B2 sends the pairwise permuted sequence {b, a , d, c, f, e}. This offers the advantage that the rearrangement requires only a very small data buffer on the part of the receiver, which normally receives the data of the second transmitter B2 and has to rearrange all received data. In the case of a frame with many such data elements being transmitted simultaneously or in the case of a frame with these data elements being transmitted by another transmitter, but permuted in pairs, this pairwise permutation This provides high reliability against data element or data block loss on the same S-CCPCH MBMS TTI during inter-frequency measurements or inter-RAT measurements.

A random permutation of the data elements is advantageous if the transmitters B1 , B2 are not aligned in time at the transmission time. If the selective combination is received with such offset data sent by the two transmitters B1, B2, this ensures that in any case it is possible to have Data reconstruction. For example, a permutation can be used in which the permuted sequence is transmitted by the second transmitter B2. The permutation takes place using the sequence of the first transmitter B1, in which corresponding four or more data elements or data blocks are permuted with one another. Data element 1 is shifted to position 3, data element 2 is shifted to position 4, data element 3 is shifted to position 1 and data element 4 is shifted to position 2. In order to perturb the periodicity, the data elements are additionally permuted between the stated groups of four or more data elements.

The shifting or permutation of data elements or the delay of the single transmitter can be carried out by the single transmitter (or a component assigned to it). However, this can also be done centrally by a central control unit CC (eg RNC) for all transmitters controlled by this control unit. The latter has the advantage that this function has to be carried out in relatively few network components, in particular only the memory required for shifting or permutation or delay has to be maintained in these components.

In another embodiment, a set of sequence orders (permutations) can also be specified. At each point in time each base station receives a sequence order from this group, the sequence order changing regularly. The sequence order is advantageously selected randomly, or pseudo-randomly, that is to say using a pseudo-random algorithm that determines the selection on the basis of known parameters, such as the cell ID and the current frame number. Due to the random sequence order selection of adjacent cells, a minimum probability of being able to reconstruct with the transmission of data packets from these two cells is guaranteed irrespective of the temporal offset of the transmissions. Here, the probability depends on the number of the sequence orders (at least if the sequence orders are chosen appropriately, as explained below). With eg 4 sequence orders, there is a minimum probability of 75% (since the sequence order which leads to the simultaneous transmission of the data packets concerned is selected only in a quarter of the cases). The method thus leads to a statistical averaging of conflicts and in particular prevents said conflicts from permanently appearing at certain locations.

The advantage of this embodiment is that the cells do not have to be synchronized in time and no coordinated scheme for assigning the order of the sequences has to be implemented.

Typically, individual cells in the network, such as sectors transmitting from a common location, are synchronized, and conversely other cells, such as sectors at other locations, are not synchronized. The method can also be advantageously used in this case: a common (pseudo) random number generator is used for the synchronized cells, and a cell-specific offset value is then added to the value emitted by said random number generator, Wherein the value range of the random number generator is the same as the number of the sequence order, and an offset value modulo the number of the sequence order is added. In this case, the offset values must be assigned such that adjacent cells receive different offset values. However, since the number of synchronized cells in the described scenario is typically small, in particular much smaller than the total number of cells of the network, this allocation is easy and can be planned locally. No planning for out-of-synchronization cells is required, especially no network-wide planning is required. This ensures that adjacent synchronized cells always adopt a different sequence order, and that at the same time the statistical averaging effect, as explained above, occurs in the case of adjacent non-synchronized cells.

In real systems there are generally more than two cells c1, c2 or sectors of transmitters B1, B2. In order to ensure that in such a case adjacent cells are shifted or permuted differently, at least four sequence orders are used. According to the well-known four-color principle, each map can be colored with four colors, so that adjacent areas are colored with different colors, which means that the sequence order can also be assigned in such a way that adjacent areas always use different colors. sequence order. It is thereby ensured that each subscriber station receiving two such adjacent cells is able to reconstruct the missing data.

A group of 4 sequence orders with 4 elements is for example the following group (sequence order group 1):

{a, b, c, d},

{d, a, b, c},

{c,d,a,b},

{b,c,d,a}

It can be seen that elements a to d occur once in each row and column. This is necessary because each data packet has to be sent by each cell exactly once (row) and therefore at each instant a data packet is sent from exactly one cell, thus receiving two cells but not being able to receive at one point in time UEs in both cells can receive the data packet again with assurance. The criterion that each element occurs exactly once per column is not sufficient if the minimum distance between data packet transmissions via different cells has to be large in order to be able to protect reception. It is therefore clear that a sequence order group of length 4 may contain at most 4 sequence orders (generally, a sequence order group of length n may contain at most n/m sequence orders, where the spacing between data packet transmissions via different cells must be greater than m).

A characteristic of this particular set of sequence sequences is that the sequence sequences are periodically exchanged with one another. As already explained above, sequence sequences of any length can be generated in a simple manner by exchanging the periods. The maximum number of possible sequence orders per group depends on the length of the sequence orders and the minimum distance between transmissions of data packets on different cells. An appropriate group can then always be found by appropriate choice of these parameters.

Another group with 4 sequence orders of 4 elements is the following group (sequence order 2):

{a, b, c, d},

{b, a, d, c},

{c,d,a,b},

{d, c, b, a}

The set is characterized in that the second sequence is a pairwise permutation of the first sequence and the fourth sequence is a pairwise permutation of the third sequence. The advantage of a sequence of pairwise replacements as already explained above is that only a small data buffer is required. However, it is not possible to form groups of more than two sequences in which all sequences are differently permuted sequences. As far as sequence order 2 is concerned, the sequence is optimal as long as it contains at least two pairs of pairwise permutations.

Said group can also be described by the following constitutional rules:

Start with a sequence of two pairwise permutations of length 2:

{a, b},

{b, a}

Continuing the sequence analogously, whereby a sequence of two pairwise permutations of length 4 arises (other letters are used for the continuation, that is to say replace a with c and b with d to obtain a unique token):

{a, b, c, d},

{b, a, d, c}

A further sequence is added where by exchanging the first half-sequence and the second half-sequence (here the sequence {c, d, a, b} is generated from {a, b, c, d} since the half-sequence "a, b" and "c, d") form the added sequence from the existing sequence, which leads to sequence order group 2):

{a, b, c, d},

{b, a, d, c},

{c,d,a,b},

{d, c, b, a},

Groups of sequence order whose length is a power of two can be generated using this compositional rule, for example the next group of length 8:

{a, b, c, d, e, f, g, h},

{b, a, d, c, f, e, h, g},

{c,d,a,b,g,h,e,f},

{d, c, b, a, h, g, f, e},

{e, f, g, h, a, b, c, d},

{f, e, h, g, b, a, d, c},

{g, h, e, f, c, d, a, b},

{h, g, f, e, d, c, b, a}

The set that also contains two sequences of pairwise permutations (and is also optimal in the aforementioned sense) has a 4-sequence order of 4 elements is the following set (however this set is slightly "inferior" because it is not so symmetric of) (sequence order group 3):

{a, b, c, d},

{b, a, d, c},

{d,c,a,b},

{c,d,b,a}

If element renaming and line swapping are excluded, there are only four sets of 4-sequences with 4 elements in total, not yet listed (sequence order set 4):

{a, b, c, d},

{c, a, d, b},

{b, d, a, c},

{d, c, b, a}

All four groups can be preferably used in mobile radio systems, sequence order 2 is particularly good as a pair-exchanged sequence and due to the symmetrical composition law, whereas sequence order 3 (disregarding composition which is only of secondary importance for performance law) are of equal value.

Claims (18)

1. For reception by a receiver (UE) sent by a first transmitter (B1) of a mobile radio system in a sequence ({a, b, c, d, e}) on a first resource element (f1) of a resource A method for the data (a-e) in which a reception gap (G) occurs at the time of reception, and the data (b) not received during the reception gap (G) is reconstructed by the receiver (UE), It is characterized in that, Data (b) not received from the first transmitter (B1) is offset in time or shifted from the second transmitter (B2) on the same resource element (f1) of the resource in the reception slot ( G) is received and used to reconstruct the sequence from data (a-e). 2. Method for transmitting a data sequence ({a, b, c, d, e}) from a transmitter (B1) to at least one receiver (UE) via a resource element (f1) of a resource in a mobile radio system (UMTS) , wherein the mobile radio system has a second transmitter (B2) with a transmission area (c2) overlapping the transmission area (c1) of the first transmitter (B1), It is characterized in that, The data (a-e) transmission by the first transmitter (B1) is shifted or shifted in time with an offset for the transmission of the data (a-e) by the second transmitter (B2) on the same resource element (f1), Data (b) not received when receiving data (a-e) from a first transmitter (B1 ) on said resource element (f1 ) due to a reception gap (G) can be reconstructed at the receiving side. 3. The method of claim 1 or 2, wherein, A transmission and reception frequency (f1), in particular a frequency of an FDD mobile radio system or an FDMA mobile radio system, is used as the resource element (f1). 4. The method according to any one of the preceding claims, wherein, The reception gap (G) occurs on the receiving side due to the brief change of the resource element (f1) to another resource element (f2) of the resource. 5. The method according to any one of the preceding claims, wherein, The mobile radio system is a communication system (UMTS) with a resource element (f1) for transmitting a data sequence ({a, b, c, d, e}) over a time duration, and the at least one receiver ( The UE) briefly interrupts the reception during this duration to receive on another resource element (f2) and thus causes the reception gap (G). 6. The method as claimed in one of the preceding claims, wherein the data sequence ({b, e, d, c, a}), in particular the data block, is transmitted by the second transmitter (B2) relative to The data sequences ({a, b, c, d, e}) when sent by the first transmitter (b1) are accordingly exchanged within data blocks with a limited number of elements. 7. The method as claimed in claim 1, wherein the limited number of elements to be exchanged is four, and a maximum of four sequentially ordered groups are correspondingly used in a mobile radio system. 8. A method as claimed in claim 7, with the following groups of four in sequential order: ({a, b, c, d}) ({b, a, d, c}) ({c, d, a,b})({d,c,b,a}). 9. A method as claimed in claim 7, with the following groups of four in sequential order: ({a, b, c, d}) ({b, a, d, c}) ({d, c, a,b})({c,d,b,a}). 10. The method of claim 7, with the following four groups in sequence order: ({a, b, c, d}) ({c, a, d, b}) ({b, d, a,c})({d,c,b,a}). 11. The method of claim 7, with the following four groups in sequence order: ({a, b, c, d}) ({d, a, b, c}) ({c, d, a,b})({b,c,d,a}). 12. The method according to any one of the preceding claims, wherein, an offset of said elements or blocks of data when transmitted by the second transmitter (B2) relative to the transmission of said elements or blocks of data by the first transmitter (B1) corresponds to at least twice said reception gap (G) The length of time. 13. The method of any one of claims 1 to 11, wherein, The data element or data block of said data is transmitted by the second transmitter (B2) with respect to the data element or data block transmitted by the first transmitter (B1) with an offset corresponding to at least said reception gap (G) The sum of the duration and the current or maximum time lapse between two adjacent transmitters. 14. A receiver (UE) of a mobile radio system (UMTS) having receiving means for receiving a data sequence ({a, b, c, d, e}), wherein the receiving device briefly interrupts the reception on the resource element (f1) in order to change the resource element (f1-f2-f1) for a short time, whereby a reception gap (G) occurs, It is characterized in that, Data (b) not received during a reception gap (G) is received offset in time from a second transmitter (B2) and processed to reconstruct said data sequence (a-e). 15. A mobile radio system arrangement of a mobile radio system (UMTS), having at least two transmitters (B1, B2) with at least partially overlapping transmission areas (c1, c2), wherein the transmitters transmit data sequences ( {a,b,c,d,e}), It is characterized in that, Said transmitters are designed to transmit data on the same resource element (f1) of a resource, wherein one transmitter (B2) of said transmitters (B1, B2) is designed to transmit data on the other transmitter (B1) A single data element (b) or data block of data (a-e) is sent with a corresponding offset to the corresponding data element or data block of . 16. A method as claimed in any one of claims 1 to 13, a receiver as claimed in claim 14 or a mobile radio system arrangement as claimed in claim 15, for receiving continuously and regardless of compressed mode In the case of the data (a-e) to be transmitted, the receiving method in the UMTS compressed mode method is performed. 17. The method according to any one of claims 1 to 13, the receiver according to claim 14 or the mobile radio system arrangement according to claim 15, wherein the first and second transmitters (B1 , B2) are the two sector transmitters of the only transmitter. 18. A method as claimed in any one of claims 1 to 13, a receiver as claimed in claim 14 or a mobile radio system arrangement as claimed in claim 15, wherein the offset enables immediate reconstruction , especially not exceeding the duration of one frame.

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