RU2728539C1 - Transmitting a data signal in a wireless communication system with reduced through delay - Google Patents

Abstract

FIELD: wireless communication equipment.SUBSTANCE: invention relates to the field of wireless communication systems, for example wireless mobile communication systems, in which data are transmitted from a transmitter to one or more receivers. This implies reducing the length of the TTI so that the UE can start demodulating the data after receiving the full short TTI. TTI length can be reduced to one OFDM symbol in time. Subframe format (propagation of reference symbols, control symbols and payload) is changed so as to ensure constant payload speed on TTI (that is 10 subcarriers out of 12 at RB for each time symbol are allocated to payload). Two additional ideas affect the TTI length signaling inside the so-called Basic Information Unit and the scenario of simultaneous aggregation of TTI mixed-length carriers. According to one embodiment, the receiver is configured to receive a data signal, which data signal comprises at least one data signal unit, wherein the data signal unit has a predetermined duration in the time domain, a number of symbols in the time domain and bandwidth in the frequency domain, wherein the data signal unit is received in a plurality of transmission intervals, wherein the length of one transmission interval is shorter than the duration of the data signal unit such that the subscript of the data signal unit symbols is received in one transmission interval, and wherein receiver comprises signal processing device configured to process symbols of data signal unit, which were received in one transmission interval.EFFECT: technical result is reduction of delay (less than 1 ms) for services of Ultra Low Delay (ULD) so-called 5G.16 cl, 24 dwg

Description

The present invention relates to the field of wireless communication systems, for example, wireless mobile communication systems, in which data is transmitted from a transmitter to one or more receivers, such as mobile terminals, where the transmitters may be base stations of a wireless communication system or other mobile terminals. Embodiments of the present invention relate to data transmission in such a system with reduced end-to-end delay. Embodiments of the present invention provide a constant bit rate and flexible length subframe approach for multi-carrier access systems.

1 is a schematic diagram of an exemplary wireless communication system including a plurality of base stations eNB ₁ through eNB ₅ , each of which serves a specific area around a base station, schematically represented by respective cells 100 ₁ through 100 ₅ . Base stations are provided to serve mobile terminals that are present within a cell. 1 shows an exemplary representation of only five cells, however, a wireless communication system may include more such cells. 1 shows two mobile terminals UE ₁ and UE ₂ , which are located in cell 100 ₂ and are served by base station eNB ₂ . Arrows 102 ₁ , 102 ₂ schematically represent uplink / downlink channels for transmitting data from a mobile terminal UE ₁ , UE ₂ to base stations eNB ₂ or for transmitting data from a base station eNB ₂ to a mobile terminal UE ₁ , UE ₂ , respectively. The wireless communication system can be an orthogonal frequency division multiplexing (OFDM) system or an orthogonal frequency division multiple access (OFDMA) system, as such, for example, used by the LTE standard or other multi-carrier systems based on frequency division multiplexing. In the current LTE standard, the transmission time interval (TTI) is set to a length of 1 ms, and the TTI is the resolution at which data can be mapped from the upper layers to the physical layer (PHY) for transmission. The mobile terminal processes the data that it receives with a resolution of 1 ms. The UE needs to synchronize with the radio network and pass control information through itself every millisecond to see if any data has been sent to it, and in the affirmative, the mobile terminal needs to decode the data channel, which is 1 ms in length.

An OFDMA system uses an OFDMA-based physical resource grid for data transmission, which contains a set of resource elements to which various physical channels and physical signals are mapped. For example, in accordance with the LTE standard, physical channels may include a physical downlink shared channel (PDSCH) carrying user-specific data, also referred to as downlink payload data, a physical broadcast channel (PBCH) carrying for example, a basic block of information, a physical downlink control channel (PDCCH) carrying, for example, downlink control information (DCI), and so on. Physical signals can include reference signals (RS), timing signals, and the like. The LTE resource grid contains a 10 ms frame in the time domain, having a given bandwidth in the frequency domain. The frame has 10 subframes 1 ms in length, and each subframe includes two slots of 6 or 7 OFDM symbols depending on the length of the cyclic prefix (CP).

2 shows an example OFDMA subframe 104 for two antenna ports as it may be used for LTE downlink communication. The depicted subframe includes two Resource Blocks (RBs), each composed of one subframe slot and 12 subcarriers in the frequency domain. The subcarriers in the frequency domain are depicted as subcarriers 0 through 11, and in the time domain, each time slot includes OFDM symbols 0 through 6. A resource unit is composed of one symbol in the time domain and one subcarrier in the frequency domain. White cells 106 represent resource elements assigned to the PDSCH and carry payload or user data. Resource elements for physical control channels (carrying payload or non-user data) are represented by shaded cells 108. In accordance with exemplary embodiments, resource elements may be assigned to a PDCCH, a physical control format indicator channel (PCFICH), and a physical hybrid ARQ indicator channel (PHICH ). Cross-hatched cells 110 represent resource elements that are assigned to an RS that can be used for channel estimation. Black cells 112 represent unused resources at the current antenna port, which may correspond to RS signals at a different antenna port.

Resource elements 108, 110, 112 assigned to physical control channels and physical reference signals are not evenly distributed over time. More specifically, in slot 0 of subframe 104, all resource elements associated with symbol 0 are assigned to physical control channels or physical reference signals. Resource elements related to symbol 4 in time slot 0, as well as resource elements related to symbols 0 and 4 in time slot 1 of said subframe are assigned partially to physical control channels or physical reference signals. The white resource elements depicted in FIG. 2 may carry symbols related to payload data or user data, and at time slot 0 for symbols 1, 2, 3, 5 and 6, 12 resource elements 106 are assigned to payload data, in while only 8 resource elements 106 are assigned to payload data in symbol 4 of slot 0 and no resource element is assigned to payload data in symbol 0. In slot 1, all resource elements related to symbols 1, 2, 3, 5 and 6 are assigned to payload data, while for symbols 0 and 4, only 8 resource elements are assigned to payload data.

The duration of the subframe 104 is 1 ms, and according to the LTE TTI standard is 1 ms. When transmitting data using the resource grid structure of FIG. 2, a receiver such as a mobile terminal or mobile user receives the resource elements of FIG. 2 in 1 ms. The information contained or specified by the resource elements can be processed and a constant amount of payload data is received for each transmission, that is, for each TTI having a length of 1 ms. This transmission scheme results in an end-to-end latency of more than 1 ms, since the receiver first receives a transmission that has a duration of 1 ms and then, once the transmission is complete, processes the control information to see if some data has been sent to the receiver, and in case this is the case, the receiver decodes the 1 ms data channel. Thus, the transmission time and the processing time add up to a period exceeding 1 ms.

An object of the present invention is to provide an approach that provides for reduced end-to-end delay in a wireless communication system using a data signal having multiple resource elements defined by symbols in the time domain and bandwidth frequencies in the frequency domain.

This problem is solved by means of the subject matter defined in the independent claims.

The embodiments are defined in the dependent claims.

Embodiments of the present invention will now be described in more detail with reference to the accompanying drawings, in which:

1 is a schematic diagram of an exemplary wireless communication system including a plurality of base stations;

2 shows an exemplary OFDMA subframe for two antenna ports as it may be used for conventional LTE downlink communications;

3 illustrates an OFDMA LTE based CBR subframe for one antenna port in accordance with embodiments of the present invention;

FIG. 4 shows an OFDMA LTE CBR subframe in accordance with another embodiment of the present invention, with two antenna ports for selected different transmit antenna ports, with FIG. 4A showing a subframe used at the first antenna port and FIG. 4B shows the subframe structure used in the second antenna port;

FIG. 5 illustrates an embodiment of an LTE OFDMA based CBR subframe structure in accordance with yet another embodiment of the present invention, implying four antenna ports for selected different transmit antenna ports, while FIGS. 5A-5D show respective CBR subframes used in transmission on the transmit antenna port 1, 2, 3 and 4, respectively;

6 shows a first OFDMA-based LTE CBR subframe followed by a second subsequent OFDMA-based LTE CBR subframe having the subframe structures shown in FIG. 4A, with control information and user data decoupled in accordance with one embodiment of the present inventions;

7 illustrates an OFDMA LTE CBR subframe having a subframe structure as shown in FIG. 3, with control information and user data being decoupled in accordance with another embodiment of the present invention;

8 illustrates embodiments of subframe structures other than LTE structure that may be used in accordance with embodiments of the present invention;

FIG. 9 illustrates an embodiment of reduced TTI signaling to a receiver in accordance with one embodiment of the present invention, with FIG. 9A indicating the main information block (MIB) as used in conventional approaches and FIG. 9B showing a modified MIB, including additional information in accordance with the approach of the invention;

Figure 10 shows a further embodiment for a modified MIB, allowing a static configuration to be applied to a smaller portion of the system bandwidth;

11 shows an embodiment for yet another modified MIB;

12 shows a Radio Resource Control (RRC) connection setup message in which "Late Non-Critical Extension" can be used to signal that the DCI format being used contains TTI assignment information;

FIG. 13 shows throughput in RB versus TTI for TTI lengths of one OFDM symbol (FIG. 13A) and two OFDM symbols (FIG. 13B);

14 is a schematic diagram of a data signal using carrier aggregation for transmission of ULD frames;

15 shows a schematic diagram of a wireless communication system for transmitting information from a transmitter to a receiver; and

16 shows a schematic diagram of transmitters in a wireless communication system for transmitting data or information to a receiver in accordance with embodiments.

Preferred embodiments of the present invention will now be described in more detail with reference to the accompanying drawings, in which elements with the same or similar function are denoted by the same reference numerals.

Data transmission in a wireless communication system, such as the OFDMA system shown in FIG. 1, may use a resource grid structure as shown in FIG. 2. The TTI, also referred to as a transmission interval, is selected to be 1 ms, which is the duration of a subframe also referred to as a data signal block. A receiver, such as a mobile user, processes the data at 1 ms resolution, that is, every millisecond, the receiver synchronizes with the radio network and processes control information. If the processing of the control information indicates that the data is intended for the receiver, then the duration of 1 ms of the data channel is decoded. There may be situations, such as extreme real-time communications use such as ultra low latency (ULD) services, where end-to-end latency needs to be reduced to 1 ms or less. When the receiver is processing data at 1ms resolution, no end-to-end delay reduction is achievable. To reduce latency to 1ms or less, the TTI can be shortened, and reducing the TTI length can provide significant bandwidth gains, for example, in slow start File Transfer Protocol (FTP) / Transmission Control Protocol (TCP) transfers and can also lead to faster processing at the application layer.

In accordance with a first embodiment of the present invention, a TTI reduction is provided in conjunction with a modified subframe format to provide constant user or payload data throughput regardless of the actual TTI length. The TTI can be reduced from a typical 1 ms length covering 14 symbols (with a normal CP) in a subframe to the maximum possible minimum of 1 symbol so that instead of typically using a single 1 ms TTI, 14 TTIs of 1 symbol long are used. In accordance with the first embodiment, the conventional subframe format is changed so that regardless of the TTI used, the payload bandwidth remains constant.

According to the second embodiment, frames or subframes of different formats may be received at the receiver, for example, one or more first frames or subframes (also referred to as data signal blocks) having a first format (also referred to as a block structure) with a predefined duration in the time domain, the number of symbols in the time domain and bandwidth in the frequency domain, and one or more second frames or subframes having a second format (different from the first format) with a predetermined duration in the time domain, the number of symbols in the time domain, and bandwidth in the frequency domain. The receiver processes symbols of frames or subframes having the first and second formats.

Different frames or subframes can be received sequentially or at the same time, for example, through the use of Carrier Aggregation (CA).

For example, the first frame or subframe may be an LTE frame or subframe, that is, a frame or subframe having a format or structure in accordance with the LTE standard such that resource elements are assigned to control channels, reference signals, and payload as defined by the LTE standard. The second frame or subframe may be a ULD subframe in accordance with additional embodiments described herein. The ULD subframe of some of the embodiments described herein is an example of a frame different from the legacy LTE frame structure, which allows users to achieve a constant bit rate in reduced TTI transmissions in a backward compatible manner using a carrier aggregation technique. In accordance with additional embodiments, other patterns of frame structures may be aggregated with the conventional LTE radio frame structure while maintaining bandwidth size. For example, radio frames having a format / structure other than the LTE standard may have a similar OFDM symbol configuration, but different arrangement of control signal data and reference signals (resource elements) compared to the LTE standard.

In accordance with the third embodiment, the subframe format remains substantially the same and the receiver starts to process the received symbols earlier than conventional approaches, that is, the receiver processes the data at a reduced resolution corresponding to a reduced TTI. In other words, the length of the decoded data channel is shorter than the length or duration of the subframe. The reduction in end-to-end delay is achieved due to the earlier start of processing at the receiver side. In accordance with embodiments, additional signaling is provided to the receiver to inform the receiver of the actual TTI length. This allows the receiver to start processing the received symbols earlier, that is, as soon as the receiver knows that the TTI is less than the subframe duration, the receiver can start processing data already received at a reduced resolution corresponding to the reduced TTI.

In the following, aspects of the invention are described in more detail, however, it should be noted that all embodiments can also be combined and used together, for example, for signaling to a receiver, in the case of using a subframe sent with a shared standard frame (second embodiment), for example, using carrier aggregation with the format of the invention (first embodiment), which resource blocks in the subframe use the subframe format of the invention, and what the actual TTI is (third embodiment).

First embodiment - Subframe format

In accordance with the first embodiment of the present invention, the reduction in TTI occurs in conjunction with a change in the subframe format from the format described above with reference to FIG. 2 to maintain a constant user or payload data throughput regardless of the actual TTI used.

Considering a conventional subframe structure transmitting a data signal frame including a plurality of subframes, each subframe has substantially the same number of resource elements related to the payload data since the TTI corresponds to the length of the subframe. Considering, for example, ULD services, in particular video ULD, machine type communication (MTC) ULD, the transmission time interval (TTI) can be reduced, for example, to be equal to 1 OFDM symbol. In other words, when considering FIG. 2 and a TTI of 1 OFDM symbol, no user data is transmitted during the first TTI, since all resource elements related to symbol 0 in time slot 0 of said subframe are either unused (see cells 112), or assigned control information or reference signals (see cells 108, 110). During each of the next three TTIs, 12 resource units 106 assigned to user data are transmitted, during the fifth TTI, 8 resource units 106 assigned to user data are transmitted, and during the sixth and seventh TTIs, 12 resource units 106 assigned to user data are transmitted again. In slot 1 of subframe 104, the number of resource units 106 assigned to user data varies from the seventh to the fourteenth TTI and is 8, 12, 12, 12, 8, 12, 12 resource units, that is, the data rate per TTI is not constant. This can force the ULD planes to accommodate the available data rate, which is not optimal for services that rely on a constant data rate.

3, 4 and 5 show embodiments of a first embodiment of the mapping of the present invention in a subframe of resource elements assigned to reference signals and control information such that a constant data bandwidth or a constant bit rate (CBR) is provided regardless of the TTI length. which is used in a multi-carrier OFDMA transmission system. Control data for physical control channels and physical signals are mapped to resource units such that for each symbol the number of resource units 106 to which payload data is mapped remains constant or the same for each symbol in subframe 104. FIG. 3 shows an embodiment of an OFDMA-based LTE CBR subframe 104 based on one antenna port so that there is no unused resource element. Compared to FIG. 2, in accordance with the inventive approach, the mapping of resource elements 108, 110 assigned to reference signals and control information is uniformly distributed in the time domain. For each symbol, the number of resource elements 106 assigned to user data or payload data is the same or constant. In the embodiment shown in FIG. 3, for each symbol in a subframe, two resource elements are assigned to control information, except for those symbols in which resource elements are assigned to reference signals. The resource elements assigned to the control information are relative to the first or twelfth subcarrier, however, in accordance with other embodiments, control data resource elements 108, 110 may be assigned to subcarriers in a different way if the number of payload resource elements 106 remains the same or constant for each symbol in the subframe. In accordance with other embodiments, more control information resource elements 108 or fewer control information resource elements can be provided, and similarly, the position of the physical signal resource elements 110 can be changed and / or the number of physical signal resource elements 110 can be increased. or reduced.

In accordance with the approach of the invention, RS resource elements 110 are more evenly spaced over the duration of the subframe and spaced equally in time and frequency to ensure the same channel estimation capability for time-varying channels as with a conventional subframe structure. Resource control information elements 108, for example, for PDCCH, PCFICH, and PHICH, are more evenly distributed over the subframe length in the time domain as compared to the usual case, which makes it possible to store the CBR. Resource elements 108 for control information are interleaved in the frequency domain, thereby providing a frequency diversity advantage. In accordance with other embodiments, for example in highly congested network scenarios, control data can be mapped to additional resource units that are also evenly distributed across OFDM symbols and the time domain so that the number of payload resource units per OFDM symbol remains the same. or permanent.

When considering a TTI having a length shorter than the subframe length of the subframe of FIG. 3, for example, less than 14 OFDM symbols in length, regardless of the actual number of OFDM symbols covered by the TTI, the number of resource elements 106 associated with payload data on the TTI is the same. or constant, thereby providing constant data throughput regardless of changes in TTI, making the subframe structure of the invention particularly suitable for ULD services for which reduced end-to-end latency is desired (achieved through reduced TTI and earlier start of data processing) and that require, for optimal performance, a constant data rate (achieved by the subframe structure of the invention).

In the above description of FIG. 3, reference has been made to a subframe of a data signal including 12 subcarriers in the frequency domain and two slots of 7 symbols in the time domain. It should be noted that the actual data signal may include a plurality of frames, each of which includes a predetermined number of subframes, for example, 10 subframes in the case of the LTE standard. Each subframe may include more than 12 subcarriers, eg, up to 1200 subcarriers for an LTE subframe in a system having a 20 MHz bandwidth. A resource block (RB) of a data signal may be composed of one time slot of a subframe and 12 subcarriers in the frequency domain so that a subframe may include multiple resource blocks. 3 shows an embodiment of two resource blocks of a subframe.

4 illustrates an OFDMA LTE based CBR subframe according to another embodiment of the present invention, based on two antenna ports for selected different transmit antenna ports. Fig. 4A shows a subframe used in the first antenna port, and Fig. 4B shows a subframe structure used in the second antenna port. Compared to FIG. 3, the subframes depicted in FIG. 4A and FIG. 4B include additional black cells 112 indicating resource elements that are not used in the current antenna port. These resource elements 112 correspond to resource elements used for the reference signals at the other antenna port. For each symbol, the number of payload data elements 106 is constant over the duration of the subframe 104, correspondingly placing non-user data resource elements 108, 110 as described above.

5 shows an embodiment of an OFDMA-based LTE CBR subframe structure according to another embodiment of the present invention based on four antenna ports for different selected transmit antenna ports. FIGS. 5A-D show respective CBR subframes used for transmission on transmit antenna port 1, 2, 3, and 4, respectively. In the embodiment of FIG. 5, the number of payload resource cells 106 in a subframe is constant over the length of the frame, that is, a constant number or the same number of payload data resource cells 106 are provided for each symbol in two slots of the subframe 104. In the embodiment of FIG. 5, resource elements 108 assigned to control information are provided in each of the symbols on the twelfth subcarrier. The resource elements 110 of the reference signal are evenly distributed over the duration of the subframe and in the frequency domain. Thus, except for symbol 6 in each slot of subframe 104, the symbols include three resource elements 106 related to non-payload data, for example, control information resource elements 108 and reference signal resource elements 110 or reference control information elements 108 and unused resource elements 112. Symbol 6 in each time slot of subframe 104 does not include reference resource elements 110 or unused resource elements 112 so that additional resource elements 108 are assigned to control information to maintain a constant data rate. Compared to FIGS. 3 and 4, which show the symmetric placement of the control information resource elements 108 with respect to the subcarriers, FIG. 5 shows another embodiment in which the control information resource elements 108 are asymmetrically allocated with respect to the subcarriers. In accordance with embodiments, control information resource elements 108 may be arbitrarily allocated if the number of payload data resource elements 106 remains constant over the duration of the subframe.

In accordance with the embodiments described above, assuming static operation of the radio channel within the duration of a subframe, the subframe structure of the invention provides constant data throughput for payload data or user data, such as is desirable for ULD services relying on such constant data throughput, for example. for optimal performance.

комплекснозначной модуляции, передаваемым на порту p последовательности

опорных сигналов, первоначально заданной в [3GPP 36.211, Раздел 6.10.1], где

является номером временного интервала внутри радиокадра, а l является номером символа OFDM внутри временного интервала, изменяется посредством введения сдвига

по отношению к символу l OFDM (отмеченным зеленым цветом) для сохранения CBR следующим образом:Next, in accordance with one embodiment, a modified mapping or arrangement of resource elements assigned to reference signals or reference signal sequences will be described based on the conventional subframe structure as described above in FIG. 2. Mapping to resource elements or symbols

complex-valued modulation transmitted on port p of the sequence

reference signals originally defined in [3GPP 36.211, Section 6.10.1], where

is the slot number within the radio frame, and l is the OFDM symbol number within the slot, modified by introducing an offset

with respect to the l OFDM symbol (marked in green) to preserve the CBR as follows:

where k specifies the position of OFDM in the frequency domain

and the OFDM number in the time domain is rewritten as

Next, a further embodiment of the first embodiment of the present invention will be described. In conventional systems, such as systems using an LTE subframe having a length or duration of 1 ms, the receiver performs channel estimation based on the reference signals within the subframe, processes the control information of the first OFDM symbol or subframe column to indicate whether resource elements have been assigned receiver or not. In the event that resource elements have been assigned to the receiver, the modulation and coding scheme (MCS) is signaled, and ultimately the receiver decodes the data included in OFDM symbols for PDSCH resource elements 106 (Payload Resource Data Elements). When considering a ULD service requiring latency, for example, below 1 ms, using the above described subframe of the invention may not be sufficient due to the propagation of the payload data over the duration of the subframe. The receiver expects the entire underlying subframe because only when the receiver has all the symbols can they be processed to perform channel estimation, decoding the control information, and ultimately decoding the data assigned to the receiver. So the latency will still be over 1ms. In accordance with embodiments, instant decoding of the transmitted user data is provided regardless of the TTI length used for the data transmission. This is achieved by estimating and predicting a channel based on previously received reference signals and by using control data that has been previously assigned and previously transmitted. Reference signals and control data received during the previous subframe may be used to process data received in the current TTI. In accordance with embodiments, also reference signals and control data received during the TTIs of the current subframe may be used to process data received in the current TTI. The reference signals and control data received during the current subframe may also include the reference signals and control data received during the current TTI. In accordance with this embodiment, the receiver, upon receiving the current subframe, already has all the necessary information required to process the data instantaneously without the need to wait for delivery of all reference signals and all control data in the current subframe, which takes at least 1 ms in conventional approaches. ... Since information for the current frame is already present at the receiver prior to receiving the current frame, for example when considering a TTI length of one symbol, the receiver in the embodiment of FIG. 3 immediately begins to decode the payload data related to symbol 0 resource elements in time slot 0 of the subframe. It can also process the reference signals needed for channel estimation for a sequential or subsequent subframe.

6 shows a first LTE OFDMA based CBR subframe 104 ₁ followed by a second LTE OFDMA based CBR subframe 104 ₂ . The subframes 104 ₁ and 104 ₂ have a subframe structure as shown in FIG. 4A, and control information for determining whether data is assigned to a receiver and ultimately decoding the data is statically mapped to each subframe. The control information and user data are decoupled in the sense that control information for transmission in the second subframe is transmitted in the first subframe 104 ₁ , and the PDSCH or payload data assigned to the receiver is transmitted in the second subframe 104 ₂ . In the embodiment depicted in FIG. 6, it is assumed that for the receiver processing subframes 104 ₁ , 104 ₂ , user data is present in the second subframe 104 ₂ in the 4th and 5th OFDM symbols or columns of the first slot and in 2 th to the 6th symbols or OFDM columns of the second slot. The control information in resource elements 114 in the first subframe 104 ₁ relating to the 11th subcarrier includes control information for determining whether data (e.g., data in resource elements 116) is assigned to a receiver in the first time slot of the second subframe 104 ₂ , and to ultimately decode the data, as indicated by arrow 118. Likewise, control information in resource elements 120 in the first subframe 104 ₁ relating to the 0th subcarrier includes control information for determining whether data (e.g., data in resource elements 122) to a receiver in the second time slot of the second subframe 104 ₂ , and to ultimately decode the data as indicated by arrow 124. Payload data in other OFDM symbols or columns may be assigned to other receivers. In accordance with other embodiments, control information 114, 120 of the first subframe 104 ₁ may indicate other portions of respective time slots of the second subframe 104 ₂ including user data. Control information related to data in the current subframe (second subframe 104 ₂ ) is processed in an earlier subframe, for example, the first subframe 104 ₁ , the data in the second subframe 104 ₂ may be processed immediately after receiving it after a reduced TTI of the exemplary 1 TTI.

7 shows an LTE OFDMA-based CBR subframe 104 having a subframe structure as shown in FIG. 3, and control information for determining whether data is assigned to a receiver and ultimately data is dynamically mapped to the subframe for decoding. The TTI length is two OFDM symbols, as indicated by blocks 126 ₁ through 126 ₇ , that is, during each TTI, the resource elements of one of blocks 126 ₁ through 126 _{7 are} transmitted to the receiver. Control information for determining whether data is assigned to a receiver and ultimately decoding the data is dynamically mapped to the current subframe 104. Control information and user data are decoupled in the sense that control information is transmitted in the first portion of subframe 104 for PDSCH or payload data assigned to the receiver, which are transmitted in the second part of the subframe 104. The number of resource units assigned to the control information may be provided dynamically, for example, the control information may be provided in resource units assigned to two OFDM symbols, see small boxes 128 ₁ , 128 ₂ , or four OFDM symbols, see large rectangles 130 ₁ , 130 ₂ . Instead of fixedly mapping control information to a subframe as in the embodiment of FIG. 6, according to the embodiment of FIG. 7, the configuration is such that the number of OFDM symbols or columns used for the control information is signaled to the receiver. The number of OFDM symbols used for control information may be equal to or different from the reduced TTI used for transmission of user data. Information about which OFDM symbols are used for control information can be provided in a system information block (SIB) or in an RRC message. The receiver can search for control data by decoding a number of OFDM signals that is indicated through the aforementioned signaling, and can ultimately decode resource elements assigned to PDSCH payload resource elements 106. In the embodiment of FIG. 7, the receiver extracts from the signaled information that control information is provided in the first reduced TTI 126 ₁ or in the first and second reduced TTI 126 ₁ , 126 ₂ . The control information in resource elements 128 ₁ , 128 ₂ or 130 ₁ , 130 ₂ indicates that user data is assigned to the receiver and that user data is provided in a fifth reduced TTI 126 ₅ as indicated by arrows 132 ₁ , 132 ₂ . Payload data in other reduced TTIs may be assigned to other receivers.

In accordance with embodiments, a first embodiment of the present invention provides an approach whereby reference signals can be evenly distributed over the duration of a resource block while maintaining time and frequency domain diversity, and the remaining OFDM symbols related to control information are time balanced. domains, interleaving them in the frequency domain, which provides for the achievement of a constant bit rate or constant data throughput. The channel can be estimated and predicted based on the previously received control symbols, and the control data needed to decode the payload data can be transmitted before the actual transmission.

Second Embodiment - Different Frame / Subframe Structures

According to the second embodiment, frames or subframes of different formats can be received at the receiver, for example, a first frame or subframe having a structure in accordance with the LTE standard and a second frame or subframe having a structure other than the LTE standard. In accordance with embodiments, the second frame / subframe may be structured in accordance with the embodiments described herein.

8 illustrates embodiments of subframe structures other than LTE that may be used in accordance with a second embodiment of the present invention. Shown are embodiments of radio subframes different from the legacy LTE case in terms of assigning control data positions.

8A shows a reduced TTI length radio subframe structure, specifically, a static TTI length configuration having 7 OFDM symbols from left to right. The control data 108 is always in the first column of OFDM columns or cells 126 ₁ -126 ₂ transmitted / received over a length of one TTI. 8B shows a reduced TTI length radio subframe structure with a static TTI length configuration of 3 OFDM symbols from left to right. The control data 110 is always in the first column of OFDM columns or cells 126 ₁ -126 ₅ transmitted / received over a length of one TTI. The subframe structures depicted in FIGS. 8A and 8B are additional embodiments for LTE transmissions using reduced TTI length (see the first and third embodiments described herein) without the need for pre-assignment and transmission of control data in previous subframes or until the current TTI is received.

8C shows a radio subframe structure in accordance with another embodiment having a TTI (see block 126 ₁ ) of 14 symbols as defined in for a legacy LTE frame, but without overhead for control data. Only reference signals 110 are provided, and all other available resource elements are assigned to payload data 106. This radio frame structure without management overhead allows for higher throughput, which is useful, for example, for bandwidth-intensive applications.

The frames / subframes according to the above-described embodiments, according to the second embodiment, may be transmitted in conjunction with LTE frames / subframes, for example, using carrier aggregation (see below).

Third Embodiment - Reduced TTI Signaling to Receiver

According to the third embodiment of the present invention, the TTI is reduced to be shorter than the subframe length, for example, the TTI may be one OFDM symbol or multiple OFDM symbols in length. The receiver starts processing the data symbols that are received in the shortened TTI. Thus, in contrast to conventional approaches, where the receiver waits for 1 ms to start decoding control information and ultimately payload data, in accordance with the third embodiment of the present invention, the receiver starts processing the received symbols earlier. For example, considering the subframe shown in FIG. 2 and based on the TTI of one OFDM symbol, the receiver starts processing the first symbol after receiving it so that control information is available once in the next TTI in which the payload data is received, so that data processing started earlier than conventional approaches. In accordance with embodiments of the third embodiment of the present invention, a reduced TTI or number of symbols that is transmitted in one transmission interval is signaled to the receiver. Thus, by signaling the reduced TTI to the receiver, the receiver can start processing the received symbols earlier.

According to an embodiment of the third embodiment of the present invention, control information that describes the configuration of the OFDM frame, for example, SIB, can be provided. A static configuration of an LTE downlink frame or part of an LTE frame may be provided, indicating that the subframe does not consist of one TTI, but the number of TTIs, for example, fourteen TTIs of one OFDM symbol length, and the number of OFDM symbols per TTI is indicated to the receiver. and the receiver can map physical transport blocks (PTBs) to physical layer resources. The signaling may indicate that the total bandwidth in a subframe, one or more bandwidths in a subframe, or one or more resource blocks in a subframe are transmitted using the reduced TTI. In accordance with embodiments, the time range may be indicated by indicating which of the subframes of the data signal frame use the reduced TTI, for example, by using the subframe index.

9 shows an embodiment for implementing reduced TTI signaling to a receiver in accordance with one embodiment of the present invention. FIG. 9A shows MIB 134 as used in conventional approaches, and FIG. 9B shows a modified MIB 136 including additional information in accordance with the inventive approach. The revised MIB 136 includes an additional element 138, named "reduced_tti_config", which signals to the receiver the number of TTIs within a subframe. The number of TTIs within a subframe may be signaled to be 1 (n1), which is the usual approach, or it may be 2, 7, or 14 TTIs, meaning 2 OFDM symbols, 7 OFDM symbols, or 14 OFDM symbols are transmitted per subframe. respectively. In the FIG. 9 embodiment, the signaling may be static for at least 4 full LTE frames (40ms), since the MIB is transmitted on the PBCH only once in every frame in subframe 0, and since the content will remain the same within 4 consecutive PBCHs, the next change in signaling can occur after 40ms.

FIG. 10 shows a further embodiment for a modified MIB 140 allowing the static configuration to be applied to a smaller portion of the system bandwidth. As can be seen from the comparison of FIG. 10 and FIG. 9B, the MIB 140 further includes an entry "red_tti_bandwidth" 142 that indicates resource blocks within four consecutive LTE frames using a reduced TTI, for example, to enable early start processing of received characters.

In accordance with other embodiments, signaling may also be included in the SIB instead of the MIB. In such a case, the receiver is informed that a reduced TTI may be used for some of the subframes or some of the resource blocks in the subframe. 11 shows an embodiment for yet another modified MIB 144 including an entry 146 called "reduced_tti_config_used", which is a Boolean value indicating that such a reduced TTI is in use (TRUE) or not (FALSE). ... In the case of indicating the use of the reduced TTI, additional information about which of the RBs or which of the subframes actually uses the reduced TTI is provided in the SIB.

According to a further embodiment of the third embodiment of the present invention, reduced TTIs having a reduced number of OFDM symbols (fewer symbols as opposed to the total number of symbols in a subframe) can be used dynamically. For example, the receiver can be dynamically configured to use at least partially the reduced TTI resource blocks or subframes. This configuration can be done via an RRC message or using a modified DCI format, which allows for mapping to a varying TTI from subframe to subframe for multiple receivers in the communication system. The system configuration may indicate the TTI size resolution, that is, the number of OFDM symbols that make up the minimum TTI length, and the DCI format may indicate to the receiver the resource blocks or subframes that are assigned the minimum resolution TTI length. Signaling can be shown as an example MIB or SIB. Alternatively, RRC messages can be used to negotiate with receivers, for example, during random access or handover, that is, during the configuration phase. The DCI format can be used to indicate each time which TTI length is currently in use, and when considering the RRC connection setup message 148 as depicted in FIG. 12, "lateNonCriticalExtension" 150 can be used to signal that that the DCI format used contains information about the assignment of the TTI length and potentially about the changed subframe structure, as described above with respect to the first embodiment.

In accordance with a third embodiment of the present invention, a subframe may consist of more than one TTI, which can result in very varying throughput for different TTIs, with very different transport block sizes depending on the TTI index. This is shown in FIG. 13, which depicts the capacity per resource block versus TTI for TTI lengths of one OFDM symbol (FIG. 13A) and two OFDM symbols (FIG. 13B). As can be seen from FIG. 13, although the approach according to the third embodiment, if the modified subframe format according to the first embodiment is not used, may have a variable bit rate or variable data throughput, however, it provides more early start of data processing, which, despite variable throughput, reduces end-to-end latency to less than 1 ms, as may be desirable for specific real-time communications use cases.

In accordance with additional embodiments that may be used in conjunction with the first, second, and third embodiments described above, Carrier Aggregation (CA) may be used to ensure backward compatibility. For example, the ULD frame structure may be used in a different band, for example, by using Carrier Aggregation (CA) so as to be backward compatible. 14 is a schematic diagram of a data signal using CA for transmitting ULD frames that are implemented in accordance with the above-described embodiments of the first and third embodiments of the present invention, or for transmitting other frames other than a legacy LTE frame in accordance with the above-described embodiments. second embodiment of the present invention. 14 is a schematic diagram of a frame 160 of a data signal using an in-band adjacent CA. The data signal includes three carrier components 162 ₁ , 162 _2, and 162 ₃ . The carrier component 162 ₁ contains a plurality of aggregated carriers spanning the first or primary 5 MHz band that can be used to transmit a conventional LTE frame in which the TTI is equal to the subframe length. In other embodiments, a primary band LTE frame may be implemented in accordance with the above-described embodiments of the first and second embodiments of the present invention. In the embodiment shown in FIG. 14, each of the carrier components 162 ₂ and 162 ₃ comprises a plurality of aggregated carriers spanning a second 1.4 MHz band and a third 1.4 MHz band, which are adjacent to the primary frequency band. and which can be used to transmit ULD frames implemented in accordance with the above-described embodiments of the present invention.

In accordance with one embodiment, the UE or receiver can use the LTE frame as an access point for synchronization and for finding where to find the band using the ULD frame structure.

In accordance with another embodiment, the UE or receiver can decode all bands to obtain ULD and non-ULD data.

In accordance with one embodiment, for example, for a low cost implementation, the two secondary bands are located together (adjacent in frequency).

In accordance with one embodiment, for reusing existing components, the bandwidth decoded at the UE may be a subset of the sum of the two bands. For example, the bandwidth for the UE may be equal to the bandwidth of the primary band 162 ₁ , and the decoded band 164 ₁ , 164 ₂ includes the carrier aggregated band 162 ₂ , 162 ₃ and a portion of the primary band 162 ₁ , for example, in a contiguous manner. so that part of the primary bandwidth is skipped. Preferably, a portion of the primary band is maintained in which the synchronization signals are located.

In accordance with embodiments, only one CA band or more CA bands may be attached to the primary band and the UE may be signaled to decode the top of the entire bandwidth or the bottom. This can be done dynamically depending, for example, on the load.

The above embodiments have been described using in-band adjacent carrier components, however, the present invention is not limited thereto. In other embodiments, the carrier components may be non-contiguous within a strip or non-contiguous between stripes.

It should be noted that the signaling of the invention according to the third embodiment may be used in conjunction with the above-described first and second embodiments to indicate to the user equipment which of the subframes or which of the resource blocks within the subframe includes the subframe format of the invention, for example, to implement ULD services , or to indicate how much of the radio frame bandwidth is to be processed.

In accordance with yet another embodiment of the present invention, which can be used for the first, second and third embodiments, data transmission using a reduced TTI, either with or without the subframe format of the invention, can only be performed in frequency bands, subframes or resource blocks. that do not provide any management information that is provided in predefined resource elements. For example, for the LTE downlink, there are control channels that are transmitted in longer periods and occupy predetermined center positions of the bandwidth in the frequency domain, for example, the Primary Synchronization Channel (PSCH) and the Secondary Synchronization Channel (SSCH) are repeated every sixth subframe. and a physical broadcast channel (PBCH) is transmitted every first subframe in an LTE radio frame. A subframe in which the control data is at predetermined positions, for example, to ensure backward compatibility, does not use a reduced TTI or a reduced TTI in conjunction with the subframe format of the invention. In accordance with such embodiments, only a subframe including control information that can be freely displayed or placed uses a reduced TTI, and only for such a subframe the reduced TTI is signaled.

In accordance with another embodiment of the present invention, which may be used for the first, second and third embodiments, symbols in a data signal block to be transmitted / received at different transmission intervals may be assigned to different receivers. For example, in the embodiment of FIG. 7, the TTI length is two OFDM symbols as indicated by blocks 126 ₁ through 126 ₇ , i.e., during each TTI, resource elements of one of blocks 126 ₁ through 126 ₇ are transmitted to the receiver and resource elements all or some of the blocks may refer to different UEs or receivers.

In accordance with embodiments of the present invention, the first, second, and third embodiments may be implemented in the wireless communication system shown in FIG. 1 including a transmitter such as a base station and a receiver such as a mobile terminal. 15 shows a schematic diagram of a wireless communication system 200 for transmitting information from a TX transmitter to an RX receiver. The TX transmitter includes an ANT _TX antenna and the RX receiver includes an ANT _RX antenna, and as indicated by arrow 204, signals are transmitted from the TX transmitter to the RX receiver via a wireless link, such as a radio link. The transmission may be in accordance with the OFDMA communication approach, and the above-mentioned transmission time interval indicates the period of radio transmission from the TX transmitter to the RX receiver. The TX transmitter includes an input 206 for receiving data to be transmitted to the RX receiver. Input data 206 is received in an OFDMA modulator 208 comprising a signal processor 210 for processing the received signals 206 to generate a data signal to be transmitted to an RX receiver. The signaling between the TX and RX transmitter is in accordance with the above-described first, second and third embodiments of the present invention, i.e., the transmitter may include an OFDMA modulator operable such that the inventive subframe format for constant data throughput is selected for one or more subframes, or resource blocks to be transmitted to the RX receiver and / or the use of a reduced TTI for one or more subframes or RBs in the signal transmitted to the RX receiver is indicated to the receiver as described above. The receiver RX receives the signal from the transmitter TX via an antenna and provides the signal to the OFDMA demodulator 212, which includes a signal processor 214 to process the received signal to generate an output signal 216.

16 is a block diagram of a first transmitter 300 in a wireless communication system for transmitting information to a receiver in accordance with the embodiments described above. Transmitter 300 receives data 302, which is encoded by channel encoder 304, modulated by modulator 306, and mapped to a plurality of carrier by mapper 308. Signal 310 is combined at 312 with control signals 314 provided by control channel block 316 and control mapper 318 with control characters 320 from block 322 generating control symbols and with signals 324 PSS / SSS from block 326 generating signals PSS / SSS. The combined signal 328 is provided to the IFFT + CP block 330, converted to DAC 332 in the analog domain. The analog signal 336 is processed for radio transmission and ultimately transmitted by antenna 338. In accordance with embodiments, aspects of the invention may be implemented using mappers 308 and 318 for displaying data items and controlling in accordance with the embodiments described above. For signaling, for example, control channel block 316 may be used to provide additional information about the reduced TTI.

Using the CA approach described above, an additional transmitter 400 can be co-located with transmitter 300 to co-provide an additional frame, eg, different from a legacy LTE frame, to the receiver with the transmitter. The structure of transmitter 400 is substantially the same as that of transmitter 300, and the corresponding blocks are indicated by corresponding reference signals. Transmitter 400 provides an additional frame using some component in accordance with CA.

Further embodiments are described below. In the 1st embodiment, a receiver is provided that is configured to receive a data signal, which data signal comprises at least one data signal block, the data signal block having a predetermined duration in the time domain, the number of symbols in the time domain and the bandwidth in the frequency domain, wherein the data signal block is received in a plurality of transmission intervals, wherein the length of one transmission interval is shorter than the duration of the data signal block, such that a subset of the symbols of the data signal block is received in one transmission interval, and wherein the receiver comprises a signal processing device made with the ability to process symbols of the data signal block, which were received in one transmission interval.

In the 2nd embodiment, a receiver according to the 1st embodiment is provided, wherein the receiver is configured to receive information indicating to the receiver the number of symbols received in one transmission interval.

In the 3rd embodiment, a receiver according to the 2nd embodiment is provided, wherein the number of symbols received in one transmission slot is indicated for the entire bandwidth of the data signal block, or for one or more portions of the bandwidth of the data signal block.

In the 4th embodiment, a receiver according to the 2nd or 3rd embodiment is provided, wherein the data signal comprises a plurality of blocks of the data signal, and wherein the number of symbols received in one transmission interval is indicated for one, more, or each of the blocks data signal.

In the 5th embodiment, a receiver according to one of the 2nd to the 4th embodiment is provided, wherein the data signal block contains control data and payload data, and wherein information indicating to the receiver the number of symbols received in one slot transmission is included in the control data of the data signal unit.

In the 6th embodiment, a receiver according to one of the 1st to 5th embodiments is provided, wherein the data signal comprises a plurality of data signal blocks, the plurality of data signal blocks comprise one or more data signal blocks including data control data in predetermined resource elements, and data of the data signal block including control data in predetermined resource elements are received at a transmission interval equal to the duration of the data signal blocks.

In the 7th embodiment, a receiver according to one of the 1st to 6th embodiments is provided, wherein the symbol and the frequency define the resource unit of the data signal block; the data signal block contains control data and payload data, and the control data is mapped to resource units of the data signal unit such that for each symbol, the number of resource units to which the payload data is mapped is constant.

in the 8th embodiment, a receiver according to one of the 1st to 7th embodiments is provided, wherein the bandwidth of the data signal block comprises a first frequency band and a second frequency band, and the data signal block is received in a plurality of transmission intervals in at least one of said first and second frequency bands.

In the 9th embodiment, a receiver according to the 8th embodiment is provided, wherein the bandwidth of the data signal block comprises at least one additional frequency band, wherein the data signal block is received in a plurality of transmission intervals.

In the 10th embodiment, a receiver according to the 8th or 9th embodiment is provided, wherein the signal processing apparatus is configured to decode data from a frequency band containing a portion of the first frequency band and the second frequency band, the bandwidth of the decoded band frequency is the bandwidth of the first frequency band.

In the 11th embodiment, a receiver according to the 10th embodiment is provided, wherein a portion of the first frequency band contains physical signals for synchronizing the receiver with a radio network.

In the 12th embodiment, a receiver according to one of the 8th to 11th embodiments is provided, wherein the first frequency band is the first carrier component of the carrier aggregation, and the second frequency band is the second carrier component of the carrier aggregation, and the carrier components are contiguous within a strip, non-contiguous within a strip, or non-contiguous between stripes.

In the 13th embodiment, a receiver according to one of the 1st to 12th embodiments is provided, wherein the symbols of a block of a data signal received at different transmission intervals are assigned to different receivers.

In the 14th embodiment, a receiver according to one of the 1st to 13th embodiments is provided, wherein the receiver is a mobile terminal in an OFDMA wireless communication system, and a data signal is an OFDM signal provided by a transmitter in a wireless communication system, and the signal OFDM has a plurality of frames, which frame includes a plurality of subframes, wherein the data signal block is a subframe of the OFDM signal, wherein the transmission interval is a transmission time interval, and wherein the subframe contains a plurality of transmission time intervals.

In the 15th embodiment, a transmitter is provided, wherein the transmitter is configured to transmit a data signal, which data signal comprises at least one data signal block, the data signal block having a predetermined duration in the time domain, the number of symbols in the time domain, and a width bandwidth in the frequency domain, wherein the data signal block is transmitted in multiple transmission intervals, wherein the length of one transmission interval is shorter than the duration of the data signal block, such that a subset of the data signal block symbols is transmitted in one transmission interval, and the transmitter is configured to transmit information indicating to the receiver the number of symbols received in one transmission interval, so as to enable the receiver to process symbols of the data signal block that were received in one transmission interval.

In the 16th embodiment, a wireless communication system is provided, comprising a receiver according to one of the 1st to 14th embodiments; and a transmitter according to the 15th embodiment.

In the 19th embodiment, a method is provided comprising the steps of receiving, at a receiver, a data signal, which data signal comprises at least one data signal block, the data signal block having a predetermined duration in the time domain, the number of symbols in the time domain, and a width bandwidth in the frequency domain, wherein the data signal block is received in a plurality of transmission intervals, wherein the length of one transmission interval is shorter than the duration of the data signal block such that a subset of the symbols of the data signal block is received in one transmission interval; and processing, by the receiver, the data signal block symbols that have been received in one transmission interval.

In the 20th embodiment, a method is provided comprising the steps of transmitting, by a transmitter, a data signal, which data signal comprises at least one data signal block, the data signal block having a predetermined duration in the time domain, the number of symbols in the time domain and the width bandwidth in the frequency domain, wherein the data signal block is transmitted in a plurality of transmission intervals, wherein the length of one transmission interval is shorter than the duration of the data signal block such that a subset of the symbols of the data signal block is transmitted in one transmission interval; and transmitting, by the transmitter, information indicating to the receiver the number of symbols received in one transmission slot, so as to enable the receiver to process the data signal block symbols that have been received in one transmission slot.

In the 21st embodiment, a method is provided comprising the steps of transmitting, by a transmitter of a wireless communication device, a data signal, which data signal comprises at least one data signal block, the data signal block having a predetermined duration in the time domain, the number of symbols in the time domain. a region and a bandwidth in the frequency domain, wherein the data signal block is transmitted in a plurality of transmission intervals, wherein the length of one transmission interval is shorter than the duration of the data signal block such that a subset of the symbols of the data signal block is transmitted in one transmission interval; transmitting, by the transmitter, information indicating the number of symbols is received in one transmission interval; receiving, at the mobile terminal of the wireless communication system, a data signal and information indicative of the number of symbols received in one transmission interval; and processing, by the mobile terminal, the block symbols of the data signal that have been received in one transmission interval.

Although some embodiments of the described concept have been described in the context of a device, it should be understood that these embodiments are also a description of a corresponding method, where a block or device corresponds to a method step or a feature of a method step. Likewise, the embodiments described in the context of a method step are also a description of a corresponding block or element, or a feature of a corresponding device.

Depending on the specific requirements of an embodiment, embodiments of the present invention may be implemented in hardware or in software. An implementation can be performed using a digital storage medium, such as a floppy disk, DVD, Blue-Ray, CD, ROM, PROM, EPROM, EEPROM, or Flash memory, which stores electronically readable control signals and which interact ( or made with the possibility of interaction) with a programmable computer system so that the corresponding method is carried out. Therefore, the digital storage medium can be machine-readable.

Some embodiments of the present invention comprise a storage medium having electronically readable control signals that are configured to interact with a programmable computer system such that one of the methods described herein is performed.

In general, embodiments of the present invention may be implemented as a computer program product with program code, wherein the program code is employed to perform one of the methods when the computer program product is executed on a computer. The program code can, for example, be stored on a computer-readable medium.

Other embodiments comprise a computer program for performing one of the methods described herein, stored on a computer-readable medium. In other words, an embodiment of the method of the invention is therefore a computer program having program code for performing one of the methods described herein when the computer program is executed on a computer.

A further embodiment of the methods of the invention is, therefore, a storage medium (or digital storage medium or computer-readable medium) containing, recorded thereon, a computer program for performing one of the methods described herein. An additional embodiment of the method of the invention is, therefore, a data stream or a sequence of signals representing a computer program for performing one of the methods described herein. The data stream or signal sequence can, for example, be carried over through a data connection such as the Internet. An additional embodiment comprises processing means, such as a computer or programmable logic device, configured or adapted to perform one of the methods described herein. An additional embodiment comprises a computer that has a computer program installed for performing one of the methods described herein.

In some embodiments, a programmable logic device (eg, a programmable gate array) may be used to perform some or all of the functionality of the methods described herein. In some embodiments, the FPGA may interact with a microprocessor to perform one of the methods described herein. In general, the methods are preferably performed by any hardware device.

The above described embodiments are merely illustrative of the principles of the present invention. It should be understood that modifications and changes to the embodiments and specific details described herein will be apparent to those skilled in the art. Therefore, it is intended that the limitations are formed only by the scope of the claims of the forthcoming patent, and not by the particular details presented by describing and explaining the embodiments herein.

Claims (47)

1. Receiver (UE1, UE2, RX), wherein the receiver (UE1, UE2, RX) is configured to receive a data signal, the data signal comprises a plurality of frames, the plurality of frames including at least a first frame different from the legacy LTE frame and a second frame different from the legacy LTE frame, wherein the first frame has a first format with a predetermined duration in the time domain, the number of symbols in the time domain, and a bandwidth in the frequency domain, wherein the second frame (104) has a second format with a predetermined duration in the time domain, the number of symbols in the time domain, and the bandwidth in the frequency domain, wherein the first format and the second format are different, wherein the receiver (UE1, UE2, RX) comprises a signal processing device configured to process symbols of frames (104) having a first format and a second format, and wherein the first frame is received in one frequency band, and the second frame is received in another frequency band. 2. The receiver (UE1, UE2, RX) of claim 1, wherein the first frame is a non-ULD frame and the second frame is a ULD frame. 3. The receiver (UE1, UE2, RX) of claim 1, wherein the first and second frames are received using Carrier Aggregation (CA). 4. The receiver (UE1, UE2, RX) of claim 1, wherein the UE is configured to receive a first frame from a first transmitter (300) and a second frame from a second transmitter (400). 5. The receiver (UE1, UE2, RX) according to claim 1, wherein the second frame is received in a plurality of transmission intervals, wherein the length of one transmission interval is shorter than the duration of the second frame, so that a subset of the symbols of the second frame is received in one transmission interval, and wherein the signal processing device is configured to process the symbols of the second frame that have been received in one transmission interval. 6. The receiver (UE1, UE2, RX) of claim 1, wherein the bandwidth of the data signal comprises at least one additional bandwidth. 7. The receiver (UE1, UE2, RX) according to claim 1, wherein the signal processing apparatus is configured to decode data from a frequency band containing a portion of the first frequency band and the second frequency band, wherein the bandwidth of the decoded frequency band is the bandwidth the transmission of the first frequency band. 8. The receiver (UE1, UE2, RX) according to claim 1, wherein the first frequency band is the first carrier component of the carrier aggregation, and the second frequency band is the second carrier component of the carrier aggregation, and wherein the carrier components are contiguous within the band, non-contiguous within stripes or non-contiguous between stripes. 9. Transmitter, wherein the transmitter is configured to transmit a data signal, the data signal comprising a plurality of frames, the plurality of frames including at least a first frame different from a legacy LTE frame and a second frame different from a legacy LTE frame, wherein the first frame has a first format with a predetermined duration in the time domain, the number of symbols in the time domain, and a bandwidth in the frequency domain, wherein the second frame has a second format with a predetermined duration in the time domain, the number of symbols in the time domain, and the bandwidth in the frequency domain, wherein the first format and the second format are different, and wherein the transmitter is configured to transmit the first frame in one frequency band and the second frame in another frequency band. 10. Wireless communication system, comprising: the receiver (UE1, UE2, RX) according to claim 1; and transmitter according to claim 9. 11. Wireless communication system, containing: the receiver (UE1, UE2, RX) according to claim 1; the first transmitter and second transmitter, wherein the first and second transmitters are configured such that the first transmitter transmits a first frame different from the legacy LTE frame in one frequency band, and the second transmitter transmits a second frame different from the legacy LTE frame in another frequency band. 12. A method for receiving a data signal, comprising the steps of: receive, at a receiver (UE1, UE2, RX), a data signal, wherein the data signal comprises a plurality of frames, the plurality of frames including at least a first frame different from a legacy LTE frame and a second frame different from a legacy LTE frame , wherein the first frame has a first format with a predetermined duration in the time domain, the number of symbols in the time domain, and a bandwidth in the frequency domain, and the second frame has a second format with a predetermined duration in the time domain, the number of symbols in the time domain, and the bandwidth in the frequency domain, wherein the first format and the second format are different; and process, by the receiver (UE1, UE2, RX), symbols of frames (104) having a first format and a second format, wherein the first frame is received in one frequency band, and the second frame is received in another frequency band. 13. A method for transmitting a data signal, comprising the step of: transmitting, by the transmitter, a data signal, the data signal comprising a plurality of frames, the plurality of frames including at least a first frame different from a legacy LTE frame and a second frame different from a legacy LTE frame, wherein the first frame has a first format with a predetermined duration in the time domain, the number of symbols in the time domain, and a bandwidth in the frequency domain, and wherein the second frame has a second format with a predetermined duration in the time domain, the number of symbols in the time domain, and the bandwidth in the frequency domain, wherein the first format and the second format are different, wherein the first frame is transmitted in one frequency band and the second frame is transmitted in another frequency band. 14. A method for transmitting a data signal, comprising the steps of: transmit, by the transmitter of the wireless communication device, a data signal, the data signal comprising a plurality of frames, the plurality of frames including at least a first frame different from a legacy LTE frame and a second frame different from a legacy LTE frame, the first a frame has a first format with a predetermined time-domain duration, a number of time-domain symbols and a frequency-domain bandwidth, and the second frame has a second format with a predetermined time-domain duration, a number of time-domain symbols, and a bandwidth in the frequency domain, wherein the first format and the second format are different, wherein the first frame is transmitted in one frequency band, and the second frame is transmitted in another frequency band; receive, in a mobile terminal of the wireless communication system, a data signal; and the symbols of frames having a first format and a second format are processed by the mobile terminal. 15. A method for transmitting a data signal, comprising the steps of: transmitting a data signal, the data signal comprising a plurality of frames, the plurality of frames including at least a first frame different from a legacy LTE frame and a second frame different from a legacy LTE frame, the first frame having a first format with a predefined duration in the time domain, the number of symbols in the time domain, and bandwidth in the frequency domain, and wherein the second frame has a second format with a predetermined duration in the time domain, the number of symbols in the time domain, and the bandwidth in the frequency domain, the first the format and the second format are different, wherein the first frame is transmitted by a first transmitter in one frequency band, and the second frame is transmitted by a second transmitter in another frequency band; receive, in a mobile terminal of the wireless communication system, a data signal; and the symbols of frames having a first format and a second format are processed by the mobile terminal. 16. A computer-readable medium having a computer program stored thereon for performing a method according to claim 12 or 13 or 14 or 15 when the computer program is executed on a computer.

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