Apparatus and method for subframe arrangement

Abstract

The invention relates to an apparatus and method for subframe arrangement. One embodiment relates to a method comprising: generating at least one symbol for control information of a subframe based on a first subcarrier spacing; generating at least one data symbol of the subframe based on the second subcarrier spacing; and transmitting a subframe including at least one symbol for control information and at least one data symbol. Another embodiment relates to a method comprising: receiving a subframe comprising at least one symbol for control information and at least one data symbol; decoding at least one symbol for the control information based on the first subcarrier spacing; and acquiring, from the decoded at least one piece of symbol information, information on a second subcarrier spacing used on the at least one data symbol.

Description

[0001] This application is a divisional application of invention patent application No. 201780069405.2 filed on September 21, 2017 (entitled “Device and method for subframe arrangement”). Technical Field

[0002] The present application generally relates to apparatus and methods for novel subframe arrangements to allow dynamic scheduling between different digital schemes. Background Art

[0003] This section is intended to provide a background or context for the invention that is described in the claims. The description herein may include concepts that could be pursued, but not necessarily concepts that have been previously conceived, implemented, or described. Therefore, unless otherwise indicated herein, the material described in this section is not prior art to the description and claims in this application.

[0004] The 3rd Generation Partnership Project (3GPP) fifth-generation (5G) technology is a next-generation radio system and network architecture that can provide extremely wideband and ultra-robust low-latency connections. 5G can improve telecommunication services provided to end users and help support large-scale machine-to-machine (M2M) communications. 5G is also expected to increase network scalability to hundreds of thousands of connections. 5G's signaling technology is expected to be improved to achieve greater coverage, as well as spectral and signaling efficiency.

[0005] A study item for the design of the 5G New Radio (NR) physical layer has been established in 3GPP. The goal of this study item is to identify and develop the technical components required for NR systems to be able to use any spectrum range up to at least 100 GHz. The goal is to achieve a single technical framework that addresses all use cases, requirements and deployment scenarios. 5G NR provides support for multiple digital schemes. It has been agreed that forward compatibility of NR should ensure the smooth introduction of future services and features without affecting access to earlier services and user equipment (UE). Therefore, there is a need to support the multiplexing of different digital schemes within the same NR carrier bandwidth (from the network perspective). Frequency division multiplexing (FDM) and / or time division multiplexing (TDM) may be considered.

[0006] For example, by using downlink (DL) control information (DCI) transmitted by the evolved NodeB (eNB) to convey DL and uplink (UL) scheduling information to the UE. For 5G NR networks, a scheme is needed to design a method for conveying DCI for multiple digital schemes within an NR carrier. Summary of the Invention

[0007] According to a first embodiment, a method may include generating at least one symbol for control information of a subframe based on a first subcarrier spacing; generating at least one data symbol of a subframe based on a second subcarrier spacing; and transmitting the subframe including the at least one symbol for control information and the at least one data symbol.

[0008] According to a second embodiment, a method may include: receiving a subframe including at least one symbol for control information and at least one data symbol; decoding the at least one symbol for control information based on a first subcarrier spacing; and obtaining information about a second subcarrier spacing used on the at least one data symbol from the decoded at least one symbol information.

[0009] According to the third and fourth embodiments, the apparatus may comprise means for performing the method according to the first and second embodiments, respectively, in any variants thereof.

[0010] According to a fifth embodiment and a sixth embodiment, an apparatus may include at least one processor and at least one memory including computer program code. The at least one memory and the computer program code may be configured to, together with the at least one processor, cause the apparatus to perform at least the method according to the first embodiment and the second embodiment, respectively, in any of their respective variations.

[0011] According to the seventh and eighth embodiments, a computer program product may encode instructions for executing a process in any variant thereof, the process comprising the method according to the first and second embodiments, respectively.

[0012] According to the ninth and tenth embodiments, a non-transitory computer-readable medium may encode instructions that, in any variation thereof, when executed in hardware perform a process comprising the methods according to the first and second embodiments, respectively. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] For a more complete understanding of example embodiments of the present invention, reference is now made to the following description taken in conjunction with the accompanying drawings, in which:

[0014] Figure 1 Resource block (RB) partitioning for different digital schemes according to example embodiments of the present application is illustrated.

[0015] Figure 2 The downlink signal generation assuming three different digital schemes according to an example embodiment of the present application is illustrated.

[0016] Figure 3 A subframe structure according to an exemplary embodiment of the present application is illustrated.

[0017] Figure 4a and 4bThe subcarrier spacing adaptation and corresponding blind detection according to an example embodiment of the present application are illustrated.

[0018] Figure 5a and 5b A flow chart according to an example embodiment of the present application is illustrated.

[0019] Figure 6 Illustrated is a simplified block diagram of an example apparatus that is suitable for use in practicing the various example embodiments of the present application. DETAILED DESCRIPTION

[0020] 3GPP considers using 15kHz for subcarrier spacing and scaling factor N=2 n (n∈[..., -2, -1, 0, 1, 2, ...]) as the baseline design assumption for NR digital schemes. 1 millisecond (ms) alignment is supported for digital schemes with 15kHz and larger subcarrier spacing (SCS). It has been agreed that in one carrier, when multiple digital schemes are time-domain multiplexed, the resource blocks (RBs) used for different digital schemes are located on a fixed grid relative to each other. For 2 n × 15 kHz subcarrier spacing, the RB grid is defined as a subset / superset of the RB grid with a subcarrier spacing of 15 kHz in a nested manner in the frequency domain. Figure 1 Example RB partitioning for different digital schemes according to example embodiments of the present application is shown, where f0 represents the minimum possible subcarrier spacing, such as 15kHz in the 5G baseline design, or 3.75kHz in some other scenarios.

[0021] The above protocol indicates that there is a need to support multiple digital schemes within the same NR carrier bandwidth (BW). On the other hand, based on the current working assumption, the NR digital scheme scaling is based on a 15kHz baseline design scaled by a factor N=2n, n∈[...,-2,-1,0,1,2,...]. In an example embodiment, a digital scheme is defined by at least a cyclic prefix (CP) duration and a subcarrier spacing of an orthogonal frequency division multiplexing (OFDM) system. As an example, for n=0,1,2, assuming that the downlink signals of three different CP-OFDM digital schemes can be as follows Figure 2 The figure is generated, where the clock rate, OFDM symbol duration (Ts), (Inverse) Fast Fourier Transform ((I)FFT) size, maximum BW allocation, number of symbols per subframe, subframe length, CP length and CP overhead percentage are listed for subcarrier spaces of 15KHz, 30kHz and 60kHz respectively. Figure 2 WOLA in

[0014] refers to the weighted overlap and windowing technique, which is a popular implementation adopted in various communication systems such as, for example, 3GPP Long Term Evolution (LTE).

[0022] The use of different digital schemes in the same frequency band is often justified by supporting both Mobile Broadband (MBB) and Ultra-Reliable Ultra-Low Latency (URLLC) services. The latter service requires short symbols for low latency, while MBB services may require wide area coverage. Figure 2 In the above example digital scheme set shown, MBB will operate using 15kHz subcarrier spacing, while URLLC can operate using 60kHz subcarrier spacing.

[0023] In LTE, the physical downlink control channel (PDCCH) or enhanced physical downlink control channel (ePDCCH) carries DCI, which can include resource assignments and other control information for a UE or UE group. Each (e)PDCCH is transmitted using one or more control channel elements (CCEs). LTE Release 8 (Rel-8) supports different (e)PDCCH sizes with different CCE aggregation levels (including 1, 2, 4, or 8 CCEs, respectively).

[0024] The UE needs to decode all possible (e)PDCCH sizes and positions in order to operate on these messages with a correct cyclic redundancy check (CRC) scrambled with the UE identity. Performing this blind decoding for all possible combinations of (e)PDCCH sizes and positions in each subframe would result in excessive power consumption and processing time requirements on the UE side, as well as an increased probability of erroneous UL / DL grant detections. To limit the number of blind decoding attempts, the LTE system adopts an approach in which only a limited set of CCE positions where (e)PDCCH can be placed is defined for each UE (at the expense of (e)PDCCH scheduling flexibility). This limited set of CCEs is known as the (e)PDCCH search space, which is divided into a common part with 6 (e)PDCCH candidates and a dedicated part with 16 candidates. These candidates need to be decoded twice because two size options are defined for (e)PDCCH in both the common and dedicated search spaces. This gives an LTE Rel-8 UE a maximum number of 44 (e)PDCCH blind decoding attempts that need to be performed in any subframe. The (e)PDCCH blind detection capability of a UE increases linearly with the number of supported DL component carriers (CCs) in LTE carrier aggregation (ie, Rel-10 and above).

[0025] The downlink control signaling principles defined in LTE also form the basis for NR. Conventional LTE, on the other hand, was designed to support only one digital scheme. Extending the current DL control signaling framework to additionally support scenarios with multiple digital schemes is not entirely straightforward. In principle, each digital scheme option will linearly increase the DCI detection burden on the UE. Furthermore, the UE may not be able to decode multiple digital schemes simultaneously with the current delay budget and current hardware. A design that supports multiple digital schemes without requiring additional hardware at the receiver is desirable.

[0026] In an example embodiment, a subframe and DCI arrangement is proposed to enable a network element (NE), such as an eNB, to dynamically schedule different digital scheme options without the UE needing to decode multiple digital schemes simultaneously. The digital schemes may be allocated on a subframe basis via NE scheduling.

[0027] In an example embodiment, a subframe containing DCI includes at least one symbol having a predetermined subcarrier spacing, regardless of the subcarrier spacing used in the rest of the subframe. For example, when 15 kHz subcarrier spacing is used for data symbols of a subframe, the at least one symbol containing DCI can be transmitted / received using 60 kHz subcarrier spacing. In an example embodiment, the at least one symbol can be the first symbol(s) of the subframe. The number of symbols having the predetermined subcarrier spacing depends on the subframe length and / or the subcarrier spacing used for data.

[0028] In an example embodiment, the DCI included in at least one symbol of a subframe contains at least information about the subcarrier spacing used in the remainder of the subframe.

[0029] In an example embodiment, at least one symbol containing DCI (or at least part of DCI) may be transmitted / received using a smaller FFT than a data symbol.The UE may adjust its receiver bandwidth such that a smaller receiver bandwidth is used to receive the at least one symbol.

[0030] Figure 3 Examples of subframe structures for 15 and 60 kHz data subcarrier spacing according to various example embodiments of the present application are shown in FIG. It should be noted that the term "subframe" is merely an example of a possible name for the time unit under consideration. For example, "time slot" or "NR subframe" may be equally applicable terms. Regardless of the digital scheme selected for the data channel, in this example, the subcarrier spacing of the first symbol is 60 kHz. Figure 3An example bidirectional subframe structure with a DL data portion (symbols denoted by "DL") according to the present application is shown. Symbols denoted by "GP" refer to the guard period, and symbols denoted by "UL" refer to the uplink control and / or data symbols of the subframe. The present invention can also be applied to other subframe types, such as DL-only, UL-only, or bidirectional subframes with a UL data portion. In various subframe types with different TDM combinations of DL control (DCI), DL data, GP and UL control or / and data, the subframe structure can be configured based on the scaling parameter (N=2 n )'s digital scheme scaling principle, the digital scheme can be selected individually for each part.

[0031] With data symbols using 15kHz subcarrier spacing, DCI can be detected by using a smaller FFT size than that used for data symbols, for example, a 512 FFT for DCI symbols and a 2048 FFT for data symbols. Another option is to use the same FFT size for control and data symbols, which corresponds to an approach with a larger bandwidth for control channels. Note that due to the different subframe lengths, the number of DCI symbols in 301 and 303 is 4 and 1, respectively, even though a 15kHz SCS is used for DL ​​data in both cases.

[0032] exist Figure 3In the example subframe structure of , there is an UL part at the end of the bidirectional subframe (301, 302, 303). It can be used to transmit a physical uplink control channel (PUCCH) carrying different types of uplink control information (UCI), such as hybrid automatic repeat request (HARQ) feedback, scheduling request, channel station information (CSI) feedback and their combination via PUCCH. In addition, the PUCCH can be multiplexed with the sounding reference signal (SRS) within the UL control symbol. In an example embodiment, the UL part can multiplex UL control and UL data. The subcarrier spacing of the UL part varies in examples 301, 302, and 303. The SCS can be selected independently of the subcarrier spacing applied to the data part (and / or DL ​​control part). For example, in 303, the subcarrier spacing of the UL part is 60kHz, while the DL data part utilizes a subcarrier spacing of 15kHz. Another example in 301 illustrates a scenario where the DL data and UL parts utilize the same subcarrier spacing (15kHz). Another option for the UL portion arrangement in 301 is to have four UL control symbols with a subcarrier spacing of 60 kHz (this example is not shown). With data symbols using a 15 kHz subcarrier spacing, the UL control symbols can be processed using a smaller FFT size than the FFT size used for the data symbols, for example, a 512 FFT for the UL control symbols and a 2048 FFT for the data symbols. Another option is to use the same FFT size for both control and data symbols, which corresponds to an approach with a larger bandwidth for the control channel.

[0033] Figure 4a and 4b FIGURE 2 illustrates the UE blind detection operation for 15kHz and 60kHz data subcarrier spacing according to various example embodiments of the present application. Figure 3 Similarly, regardless of the digital scheme selected for the data channel, the subcarrier spacing of the DCI symbol is 60 kHz. The first one or more control symbols of the subframe convey information about the subcarrier spacing of the remaining blocks of the subframe. In an example embodiment, if the subcarrier spacing of the data is 15 kHz and the subframe length is 0.5 ms or about 0.5 ms (e.g., Figure 3 ), then (e)PDCCH blind detection is performed based on the first four symbols of the subframe (each with 60kHz SCS), as shown in Figure 4a In another example embodiment, if the subcarrier spacing of the data is 60kHz (e.g., Figure 3 ), or the subframe length is 0.125 ms or about 0.125 ms (e.g., Figure 3 subframe structure 303), then (e)PDCCH blind detection is performed based on four DCI symbols, each DCI symbol coming from one of the four subframes, such as Figure 4bshown.

[0034] Figure 5a and 5b Flowcharts of various exemplary embodiments according to the present application are illustrated. Figure 5a In an example of a network element (eNB), at step 501, a network element (eNB), such as an evolved NodeB (eNB), generates at least one symbol for control information of a subframe based on a first subcarrier spacing. The first subcarrier spacing may be predetermined or configured by a standard specification, a manufacturer, a network operator, or dynamic signaling (such as higher layer signaling). At step 503, the NE also generates at least one data symbol of a subframe based on a second subcarrier spacing. The first subcarrier spacing and the second subcarrier spacing may be the same or different. The control information carried by the at least one symbol for control information includes at least information about the second subcarrier spacing. This may be transmitted, for example, in the form of a common DCI or a separate signal multiplexed in a resource element of at least one symbol. At step 505, the NE transmits a subframe including at least one symbol for control information and at least one data symbol.

[0035] exist Figure 5b In the example of FIG5 , in step 502, a user equipment receives a subframe including at least one symbol for control information and at least one data symbol. In step 504, the UE decodes the at least one symbol for control information based on a first subcarrier spacing. The first subcarrier spacing may be predetermined or configured by a standard specification, a manufacturer, a network operator, or dynamic signaling (such as higher layer signaling). In step 506, the UE obtains information about a second subcarrier spacing used on the at least one data symbol from the decoded at least one symbol for control information. The first subcarrier spacing and the second subcarrier spacing may be the same or different.

[0036] refer to Figure 6 , Figure 6 The present disclosure illustrates simplified block diagrams of various example devices that are suitable for use in practicing the various example embodiments of the present disclosure. Figure 6 In the embodiment, NE 601 is adapted to communicate with UE 611. UE 611 includes at least one processor circuitry 615, at least one memory (MEM) 614 coupled to the at least one processor circuitry 615, and a suitable transceiver (TRANS) 613 (having a transmitter (TX) and a receiver (RX)) coupled to the at least one processor circuitry 615. The at least one MEM 614 stores a program (PROG) 612. TRANS 613 is used for bidirectional wireless communication with NE 601.

[0037] NE 601 includes at least one processor circuitry 605, at least one memory (MEM) 604 coupled to the at least one processor circuitry 605, and a suitable transceiver (TRANS) 603 (having a transmitter (TX) and a receiver (RX)) coupled to the at least one processor circuitry 605. The at least one MEM 604 stores a program (PROG) 602. TRANS 603 is used for bidirectional wireless communication with UE 611. NE 601 may be coupled to one or more cellular networks or systems (not shown in this figure).

[0038] like Figure 6 As shown, NE 601 may also include a multi-digital scheme control unit 606. Unit 606, along with at least one processor circuitry 605 and PROG 602, may be used by NE 601 in conjunction with various example embodiments of the present application, as described herein.

[0039] like Figure 6 As shown, UE 611 may also include a multiple digital scheme processing unit 616. Unit 616, along with at least one processor circuit 615 and PROG 612, may be used by UE 611 in conjunction with various example embodiments of the present application, as described herein.

[0040] At least one of PROG 602 and 612 is assumed to include program instructions that, when executed by an associated processor, enable the electronic device to operate in accordance with example embodiments of the present disclosure, as discussed herein.

[0041] In general, various example embodiments of device 611 may include, but are not limited to, a cellular telephone, a personal digital assistant (PDA) with wireless communication capabilities, a portable computer with wireless communication capabilities, an image capture device such as a digital camera with wireless communication capabilities, a gaming device with wireless communication capabilities, a music storage and playback device with wireless communication capabilities, an Internet appliance that allows wireless Internet access and browsing, and a portable unit or terminal that includes a combination of such functionality.

[0042] The example embodiments disclosed herein may be implemented by computer software or computer program code executable by one or more of the processor circuits 605 , 615 of the NE 601 and the UE 611 , or by hardware or a combination of software and hardware.

[0043] MEMs 604 and MEMs 614 may be of any type suitable for the local technical environment and may be implemented using any suitable data storage technology, such as, as non-limiting examples, semiconductor-based memory devices, flash memory, magnetic memory devices and systems, optical memory devices and systems, fixed memory, and removable memory. Processor circuitry 605 and 615 may be of any type suitable for the local technical environment and may include, as non-limiting examples, one or more of a general-purpose computer, a special-purpose computer, a microprocessor, a digital signal processor (DSP), and a processor based on a multi-core processor architecture.

[0044] Without in any way limiting the scope, interpretation, or application of the claims appearing below, the technical effect of one or more of the example embodiments disclosed herein may be flexible multiplexing of different digital schemes for control information signaling with the ability to limit blind detection work by the UE. This also allows the UE to save energy because parallel processing is not required and control information can be received using a smaller FFT / BW.

[0045] Embodiments of the present invention may be implemented in software, hardware, application logic, or a combination of software, hardware, and application logic. The software, application logic, and / or hardware may reside on a device such as a user equipment, eNB, or other mobile communication device. If desired, a portion of the software, application logic, and / or hardware may reside on the network element 601, a portion of the software, application logic, and / or hardware may reside on the UE 611, and a portion of the software, application logic, and / or hardware may reside on other chipsets or integrated circuits. In example embodiments, the application logic, software, or instruction set is maintained on any of various conventional computer-readable media. In the context of this document, a "computer-readable medium" may be any medium or device capable of containing, storing, transmitting, disseminating, or transmitting instructions for use by or in connection with an instruction execution system, apparatus, or device. A computer-readable medium may include a non-transitory computer-readable storage medium, which may be any medium or device that can contain or store instructions for use by or in connection with an instruction execution system, apparatus, or device.

[0046] It should also be noted herein that, although example embodiments of the present invention are described above, these descriptions should not be considered limiting. On the contrary, several changes and modifications may be made without departing from the scope of the present invention. For example, the example embodiments described may use SCS 15kHz and 60kHz as examples of different SCSs. This idea can be extended to any scenario with separate SCSs for control and data. There may also be more than two SCS options. For example, there may be four digital scheme options, and the selected digital scheme option is indicated via at least one symbol for control information. Generally speaking, the selection can be viewed as a subframe (time slot) format for a specific time period, and the control information can indicate a combination of digital schemes selected for different parts of the subframe (time slot), optionally also including the subframe (time slot) length. In addition, although the arrangement proposed above focuses primarily on scenarios where multiple digital schemes are mixed in a TDM manner, the principle can also be applied to scenarios where FDM multiplexing between different digital schemes is used. In this case, the principle can be applied in a subband-based manner.

[0047] Furthermore, the various names and terms are not intended to be limiting in any respect. For example, "subframe" herein is a general term used to indicate a regular scheduling unit in time and can be identified by any suitable name.

[0048] If desired, the different functions discussed herein may be performed in a different order and / or concurrently with one another. Furthermore, if desired, one or more of the above functions may be optional or may be combined. Thus, the foregoing description should be considered merely illustrative of the principles, teachings, and exemplary embodiments of the present invention, and not as a limitation thereof.

Claims

1. A user equipment, comprising: at least one processor; a transceiver configured to communicate with a network device, the transceiver being operably coupled to the at least one processor; as well as at least one memory having instructions stored thereon, which, when executed by the at least one processor, cause the user equipment to perform at least: receiving, via the transceiver, a subframe in which a plurality of digital schemes are multiplexed in a time division multiplexing (TDM) manner, the subframe comprising at least one symbol for control information and at least one data symbol, each of the plurality of digital schemes being defined by a different subcarrier spacing; decoding the at least one symbol for control information based on a first digital scheme of the plurality of digital schemes; as well as Information about a second digital scheme among the plurality of digital schemes is obtained from the decoded at least one symbol for control information, the second digital scheme being used on the at least one data symbol, the second digital scheme being selected separately from the first digital scheme. 2 . The user equipment according to claim 1 , wherein the first digital scheme is configured by high-layer signaling.

3. The user equipment of claim 1, wherein the first digital scheme is different from the second digital scheme.

4. The user equipment of claim 1, wherein each of the plurality of numbering schemes is defined by a respective cyclic prefix.

5. The user device of claim 1, wherein the instructions stored on the at least one memory, when executed by the at least one processor, further cause the user device to perform at least: Downlink control information is obtained from the decoded at least one symbol for control information, wherein the downlink control information includes resource allocation information for the user equipment.

6. A method comprising: receiving, at a user equipment, a subframe in which a plurality of digital schemes are multiplexed in a time division multiplexing (TDM) manner, the subframe comprising at least one symbol for control information and at least one data symbol, each of the plurality of digital schemes being defined by a different subcarrier spacing; decoding the at least one symbol for control information based on a first digital scheme of the plurality of digital schemes; as well as Information about a second digital scheme among the plurality of digital schemes is obtained from the decoded at least one symbol for control information, the second digital scheme being used on the at least one data symbol, the second digital scheme being selected separately from the first digital scheme. The method according to claim 6 , wherein the first digital scheme is configured by high-layer signaling. The method of claim 6 , wherein the first digital scheme is different from the second digital scheme.

9. The method of claim 6, wherein each of the plurality of numbering schemes is defined by a respective cyclic prefix.

10. The method according to claim 6, further comprising: Downlink control information is obtained from the decoded at least one symbol for control information, wherein the downlink control information includes resource allocation information for the user equipment.

11. A non-transitory computer-readable storage medium comprising instructions stored thereon, which, when executed by at least one processor, cause a user equipment to perform the method according to any one of claims 6 to 10.

12. A network device comprising: at least one processor; a transceiver for two-way wireless communication with a user device, the transceiver being coupled to the at least one processor; as well as at least one memory having instructions stored thereon, which, when executed by the at least one processor, cause the user equipment to perform at least: generating at least one symbol for downlink control information (DCI) based on a first subcarrier spacing of a first subcarrier in a first subband; generating at least one data symbol based on a second subcarrier spacing of a second subcarrier in a second subband, the second subband being different from the first subband, wherein the second subcarrier spacing is different from the first subcarrier spacing; as well as The at least one symbol for the DCI and the at least one data symbol are transmitted, wherein the DCI includes information about the second subcarrier spacing and information about scheduling transmission of the at least one data symbol.

13. The network device of claim 12, wherein transmitting the at least one symbol comprises: The at least one symbol for the DCI is transmitted by using a Fast Fourier Transform having a size smaller than a size of the at least one data symbol.

14. A network device according to claim 12, wherein transmitting the at least one symbol for the DCI includes transmitting a subframe, the subframe including the at least one symbol for the DCI, wherein the number of the at least one symbol for the DCI depends on at least one of the length of the subframe and the second subcarrier spacing.

15. The network device of claim 12, wherein the transmitting comprises: The at least one symbol for the DCI is transmitted by using a Fast Fourier Transform having a size smaller than a size of the at least one data symbol.

16. The network device of claim 12, wherein the transmitting comprises: The at least one symbol for the DCI is transmitted by using a Fast Fourier Transform having a size the same as that of the at least one data symbol but a bandwidth greater than that of the at least one data symbol.

17. A method comprising: generating at least one symbol for downlink control information (DCI) based on a first subcarrier spacing of a first subcarrier in a first subband; generating at least one data symbol based on a second subcarrier spacing of a second subcarrier in a second subband, the second subband being different from the first subband, wherein the second subcarrier spacing is different from the first subcarrier spacing; as well as The at least one symbol for the DCI and the at least one data symbol are transmitted, wherein the DCI includes information about the second subcarrier spacing and information about scheduling transmission of the at least one data symbol.

18. The method of claim 17, wherein transmitting the at least one symbol comprises: The at least one symbol for the DCI is transmitted by using a Fast Fourier Transform having a size smaller than a size of the at least one data symbol.

19. The method of claim 17, wherein transmitting the at least one symbol for the DCI comprises transmitting a subframe, the subframe comprising the at least one symbol for the DCI, wherein the number of the at least one symbol for the DCI depends on at least one of the length of the subframe and the second subcarrier spacing.

20. The method of claim 17, wherein the transmitting comprises: The at least one symbol for the DCI is transmitted by using a Fast Fourier Transform having a size smaller than a size of the at least one data symbol.

21. The method of claim 17, wherein the transmitting comprises: The at least one symbol for the DCI is transmitted by using a Fast Fourier Transform having a size the same as that of the at least one data symbol but a bandwidth greater than that of the at least one data symbol.

22. A non-transitory computer-readable storage medium comprising instructions stored thereon, which, when executed by at least one processor, cause a network device to perform the method according to any one of claims 17 to 21.

23. A user equipment, comprising: at least one processor; a transceiver for two-way wireless communication with a network device, the transceiver being operably coupled to the at least one processor; as well as at least one memory having instructions stored thereon, which, when executed by the at least one processor, cause the user equipment to perform at least: receiving a subframe in which a plurality of digital schemes are multiplexed in a time division multiplexing (TDM) manner, the subframe comprising at least one symbol for control information and at least one data symbol, each of the plurality of digital schemes being defined by a different subcarrier spacing; decoding the at least one symbol for control information based on a first digital scheme, the first digital scheme being one of the plurality of digital schemes; as well as Information about a selected second digital scheme is obtained from the decoded at least one symbol for control information, the second digital scheme being used on the at least one data symbol, the second digital scheme being one of the plurality of digital schemes, the second digital scheme being selected separately from the first digital scheme.

24. The user equipment according to claim 23, wherein the first digital scheme is configured by higher layer signaling.

25. The user equipment of claim 23 or 24, wherein the first digital scheme is different from the second digital scheme.

26. The user equipment of claim 23 or 24, wherein each of the plurality of numbering schemes is defined by a respective cyclic prefix.

27. The user equipment according to claim 23 or 24, wherein the instructions stored on the at least one memory, when executed by the at least one processor, further cause the user equipment to perform at least: Downlink control information is obtained from the decoded at least one symbol for control information, wherein the downlink control information includes resource allocation information for the user equipment.

28. A method comprising: receiving, by a user equipment, a subframe in which a plurality of digital schemes are multiplexed in a time division multiplexing (TDM) manner, the subframe comprising at least one symbol for control information and at least one data symbol, each of the plurality of digital schemes being defined by a different subcarrier spacing; decoding, by a user equipment, the at least one symbol for control information based on a first digital scheme, the first digital scheme being one of the plurality of digital schemes; as well as Information about a selected second digital scheme is obtained by a user equipment from at least one decoded symbol for control information, wherein the second digital scheme is used on the at least one data symbol, the second digital scheme is one of the multiple digital schemes, and the second digital scheme is selected separately from the first digital scheme.

29. The method of claim 28, wherein the first digital scheme is configured by higher layer signaling.

30. The method of claim 28 or 29, wherein the first digital scheme is different from the second digital scheme.

31. The method of claim 28 or 29, wherein each of the plurality of numbering schemes is defined by a respective cyclic prefix.

32. The method according to claim 28 or 29, further comprising: Downlink control information is obtained from the decoded at least one symbol for control information, wherein the downlink control information includes resource allocation information for the user equipment.

33. A non-transitory computer-readable storage medium comprising instructions stored thereon, which, when executed by at least one processor, cause a user device to perform the method according to any one of claims 28 to 32.

34. A network device comprising: at least one processor; a transceiver for two-way wireless communication with a user device, the transceiver being coupled to the at least one processor; as well as at least one memory having instructions stored thereon, which, when executed by the at least one processor, cause the user equipment to perform at least: generating at least one symbol for control information based on the first digital scheme, the control information including information about the selected second digital scheme; generating at least one data symbol based on the second digital scheme, the second digital scheme being selected independently of the first digital scheme; as well as A transmission subframe in which a plurality of digital schemes are multiplexed in a time division multiplexing (TDM) manner, the subframe comprising the at least one symbol for control information and the at least one data symbol, each of the plurality of digital schemes being defined by a different subcarrier spacing, the plurality of digital schemes comprising the first digital scheme and the second digital scheme.

35. The network device of claim 34, wherein the first digital scheme is configured by higher layer signaling.

36. The network device of claim 34 or 35, wherein the first numbering scheme is different from the second numbering scheme.

37. The network device of claim 34 or 35, wherein each of the plurality of numbering schemes is defined by a respective cyclic prefix.

38. The network device according to claim 34 or 35, wherein the control information comprises downlink control information, and the downlink control information comprises resource allocation information.

39. A method comprising: generating at least one symbol for control information based on the first digital scheme, the control information including information about the selected second digital scheme; generating at least one data symbol based on the second digital scheme, the second digital scheme being selected independently of the first digital scheme; as well as A transmission subframe in which a plurality of digital schemes are multiplexed in a time division multiplexing (TDM) manner, the subframe comprising the at least one symbol for control information and the at least one data symbol, each of the plurality of digital schemes being defined by a different subcarrier spacing, the plurality of digital schemes comprising the first digital scheme and the second digital scheme.

40. The method of claim 39, wherein the first digital scheme is configured by higher layer signaling.

41. The method of claim 39 or 40, wherein the first digital scheme is different from the second digital scheme.

42. The method of claim 39 or 40, wherein each of the plurality of numbering schemes is defined by a respective cyclic prefix.

43. The method of claim 39 or 40, wherein the control information comprises downlink control information including resource allocation information.

44. A non-transitory computer-readable storage medium comprising instructions stored thereon, which, when executed by at least one processor, cause a user device to perform the method according to any one of claims 39 to 43.

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