CN111954303A

CN111954303A - PDSCH resource allocation method and device based on M-DFT-S-OFDM

Info

Publication number: CN111954303A
Application number: CN201910413483.0A
Authority: CN
Inventors: 吴敏; 王轶; 付景兴; 孙霏菲
Original assignee: Beijing Samsung Telecommunications Technology Research Co Ltd; Samsung Electronics Co Ltd
Current assignee: Beijing Samsung Telecom R&D Center; Beijing Samsung Telecommunications Technology Research Co Ltd; Samsung Electronics Co Ltd
Priority date: 2019-05-17
Filing date: 2019-05-17
Publication date: 2020-11-17

Abstract

The invention provides a method and equipment for allocating Physical Downlink Shared Channel (PDSCH) resources, and relates to the technical field of communication. Specifically, a method for allocating PDSCH resources on a physical downlink shared channel implemented at a user equipment side, wherein the method comprises: acquiring frequency domain resource allocation information and virtual resource allocation information in DFT; and determining the PDSCH resources according to the frequency domain resource allocation information and the virtual resource allocation information in the DFT. The invention realizes the PDSCH resource allocation in the high-frequency communication system based on the M-DFT-S-OFDM and can reduce the signaling overhead.

Description

PDSCH resource allocation method and device based on M-DFT-S-OFDM

Technical Field

The invention relates to the technical field of communication, in particular to a method and equipment for distributing PDSCH resources in a high-frequency communication system based on M-DFT-S-OFDM.

Background

In the 3GPP LTE standard, the downlink uses a CP-OFDM (Orthogonal Frequency Division Multiplexing) access technique with a multi-carrier waveform characteristic, and the uplink uses a DFT-S-OFDM (Discrete Fourier Transform Spread Orthogonal Frequency Division Multiplexing) access technique with a single-carrier waveform characteristic in order to reduce the PAPR (Peak to Average Power Ratio). For the DFT-S-OFDM access technique, DFT conversion is performed on a transmission signal before the transmission signal is mapped to a Frequency domain subcarrier, so that a time domain waveform has a single carrier characteristic, PAPR is reduced, and the use efficiency of an RF (Radio Frequency) power amplifier is improved.

In an ultra-high Frequency communication system, for example, a Frequency spectrum around 62.5GHz, signal attenuation is more serious, coverage is small, PAPR performance is more deteriorated, a downlink CP-OFDM waveform used by the original 3GPP LTE and 5G NR systems is no longer applicable, and a new waveform may need to be used, where one usable downlink Multiple access technique is M-DFT-S-OFDM (Multiple Discrete Fourier Transform Spread Orthogonal Frequency Division Multiplexing based on Multiple Discrete Fourier Transform Spread spectrum), referring to fig. 1, downlink transmission signals of different UEs or different UE groups are respectively subjected to DFT Transform of the same or different Size (Size) and then mapped onto a Frequency domain, thereby reducing PAPR. The PAPR performance of the M-DFT-S-OFDM is between that of DFT-S-OFDM and CP-OFDM, namely, the PAPR performance is better than that of CP-OFDM but slightly worse than that of DFT-S-OFDM. However, how to allocate PDSCH (Physical Downlink Shared Channel) resources to this system needs to be explored.

Disclosure of Invention

In order to overcome the above technical problems or at least partially solve the above technical problems, the following technical solutions are proposed:

in a first aspect, the present invention provides a PDSCH resource allocation method in an M-DFT-S-OFDM-based high frequency communication system implemented at a user equipment, wherein the method includes:

acquiring frequency domain resource allocation information and virtual resource allocation information in DFT;

and determining the PDSCH resources according to the frequency domain resource allocation information and the virtual resource allocation information in the DFT.

In a second aspect, the present invention provides a method implemented at a base station for assisting PDSCH resource allocation in an M-DFT-S-OFDM-based high frequency communication system, wherein the method comprises:

and sending the frequency domain resource allocation information and the virtual resource allocation information in the DFT to the user equipment, so that the user equipment determines the PDSCH resources according to the frequency domain resource allocation information and the virtual resource allocation information in the DFT.

In a third aspect, the present invention provides a user equipment for PDSCH resource allocation in an M-DFT-S-OFDM-based high frequency communication system, wherein the user equipment comprises:

the information acquisition device is used for acquiring frequency domain resource allocation information and virtual resource allocation information in DFT;

and the PDSCH resource determining device is used for determining PDSCH resources according to the frequency domain resource allocation information and the virtual resource allocation information in the DFT.

In a fourth aspect, the present invention provides a base station for assisting PDSCH resource allocation in an M-DFT-S-OFDM based high frequency communication system, wherein the base station comprises:

and the information sending device is used for sending the frequency domain resource allocation information and the virtual resource allocation information in the DFT to the user equipment, so that the user equipment determines the PDSCH resources according to the frequency domain resource allocation information and the virtual resource allocation information in the DFT.

In a fifth aspect, the present invention provides a system for PDSCH resource allocation in an M-DFT-S-OFDM based high frequency communication system, wherein the system comprises the aforementioned user equipment for PDSCH resource allocation in an M-DFT-S-OFDM based high frequency communication system according to the third aspect of the present invention, and the aforementioned base station for assisting PDSCH resource allocation in an M-DFT-S-OFDM based high frequency communication system according to the fourth aspect of the present invention.

Compared with the prior art, the invention realizes the PDSCH resource allocation in the high-frequency communication system based on the M-DFT-S-OFDM and can also reduce the signaling overhead.

Drawings

The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1-4 and 6 are schematic diagrams of a M-DFT-S-OFDM-based downlink multiple access technique provided in the prior art;

FIG. 5 is a schematic diagram of a time domain waveform of an M-DFT-S-OFDM symbol;

fig. 7 is a schematic device diagram of a user equipment and a base station for PDSCH resource allocation in an M-DFT-S-OFDM-based high-frequency communication system according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of a DFT sub-sample being divided into a plurality of sub-sample groups;

FIG. 9 is a diagram of DFT inputs being equally divided by a group of UEs;

fig. 10 is a flowchart of a method for implementing PDSCH resource allocation in an M-DFT-S-OFDM-based high-frequency communication system by using user equipment and a base station in cooperation according to an embodiment of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.

As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. As used herein, the term "and/or" includes all or any element and all combinations of one or more of the associated listed items.

It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

As will be appreciated by those skilled in the art, a "terminal" as used herein includes both devices having a wireless signal receiver, which are devices having only a wireless signal receiver without transmit capability, and devices having receive and transmit hardware, which have devices having receive and transmit hardware capable of two-way communication over a two-way communication link. Such a device may include: a cellular or other communication device having a single line display or a multi-line display or a cellular or other communication device without a multi-line display; PCS (Personal Communications Service), which may combine voice, data processing, facsimile and/or data communication capabilities; a PDA (Personal Digital Assistant), which may include a radio frequency receiver, a pager, internet/intranet access, a web browser, a notepad, a calendar and/or a GPS (Global Positioning System) receiver; a conventional laptop and/or palmtop computer or other device having and/or including a radio frequency receiver. As used herein, a "terminal" or "terminal device" may be portable, transportable, installed in a vehicle (aeronautical, maritime, and/or land-based), or situated and/or configured to operate locally and/or in a distributed fashion at any other location(s) on earth and/or in space. As used herein, a "terminal Device" may also be a communication terminal, a web terminal, a music/video playing terminal, such as a PDA, an MID (Mobile Internet Device) and/or a Mobile phone with music/video playing function, or a smart tv, a set-top box, etc.

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

The units described in the embodiments of the present invention may be implemented by software or hardware. Where the name of a unit does not in some cases constitute a limitation of the unit itself, for example, the first retrieving unit may also be described as a "unit for retrieving at least two internet protocol addresses".

The foregoing description is only exemplary of the preferred embodiments of the invention and is illustrative of the principles of the technology employed. It will be appreciated by those skilled in the art that the scope of the disclosure herein is not limited to the particular combination of features described above, but also encompasses other embodiments in which any combination of the features described above or their equivalents is encompassed without departing from the spirit of the disclosure. For example, the above features and (but not limited to) features having similar functions disclosed in the present invention are mutually replaced to form the technical solution.

It should be understood that, although the steps in the flowcharts of the figures are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and may be performed in other orders unless explicitly stated herein. Moreover, at least a portion of the steps in the flow chart of the figure may include multiple sub-steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed alternately or alternately with other steps or at least a portion of the sub-steps or stages of other steps.

The foregoing is only a partial embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

For a better understanding of the present invention, a downlink multiple access technique based on M-DFT-S-OFDM is first described.

In the M-DFT-S-OFDM-based downlink multiple access technology, downlink transmission signals of different UEs or different UE groups are mapped to a frequency domain after DFT transformation respectively, and then OFDM modulation is performed, compared with the traditional OFDM multiple access technology, the M-DFT-S-OFDM can obviously reduce the PAPR and improve the use efficiency of a power amplifier, and is suitable for a high-frequency communication system which is more sensitive to the PAPR performance, such as a communication system with a carrier frequency near 62.5 GHz.

The difference with the conventional DFT-S-OFDM multiple access technique is that DFT-S-OFDM has only one DFT transform before OFDM modulation, while M-DFT-S-OFDM has multiple DFT transforms before OFDM modulation. Furthermore, the existing DFT-S-OFDM is used only for uplink, and M-DFT-S-OFDM can be used for downlink. Although the PARR performance of the M-DFT-S-OFDM is slightly worse than that of the DFT-S-OFDM, the method can support orthogonal frequency division multiplexing of a plurality of UEs or a plurality of UE groups, and reduce the transmission bandwidth of the UEs, thereby supporting the UEs with small bandwidth receiving capability, simplifying the realization of the UEs and reducing the cost of the UEs.

In one possible embodiment, a schematic block diagram of an M-DFT-S-OFDM based downlink multiple access technique is shown in FIG. 1. In fig. 1, data of UE1 is mapped to the frequency domain after DFT transform at M1 points, and the mapping mode is localized mapping, that is, mapping to a group of continuous subcarriers in the frequency domain. Similarly, the data of the UE2 is mapped to the frequency domain after being subjected to M2-point DFT. Here, the Size (Size) of DFT is the number of subcarriers allocated in the frequency domain, in other words, the number of subcarriers allocated in the frequency domain by the system for UE1 is M1, and the number of subcarriers allocated in the frequency domain for UE2 is M2. In actual transmission, M1 and M2 may or may not be equal.

In addition, similar to the existing CP-OFDM-based downlink multiple access technology, some subcarriers need to be reserved for guard bandwidth before OFDM modulation, and these reserved subcarriers cannot be used for data transmission. As shown in fig. 1, some subcarriers are reserved at both ends of the FFT input, i.e. the input signal on these subcarriers is 0.

Compared with the conventional CP-OFDM, in fig. 1, the transmitting end of the base station needs to perform DFT (discrete fourier transform) on data of each UE before mapping frequency domain resources, and correspondingly, the receiving end of the UE needs to perform IDFT after frequency domain equalization and perform demodulation and decoding based on the output of the IDFT.

Fig. 1 multiplexes 2 UEs within the entire system bandwidth, and the data of the 2 UEs are respectively subjected to DFT transform before being mapped to frequency domain subcarriers, that is, the number of orthogonal frequency division multiplexed UEs is the number of DFT transforms, and each DFT Size (DFT Size) is the number of frequency domain subcarriers allocated to the corresponding UE. Fig. 1 is a simple diagram, and can be easily extended to transmit data of more UEs using more DFT.

Theoretically, the larger the number of DFT used by the system is, the worse the PAPR performance will be, and when the number of DFT becomes smaller and approaches to 1, the PAPR performance will improve and approach to single carrier (DFT-S-OFDM); when the number of DFTs becomes large and approaches the number of available subcarriers, PAPR performance deteriorates and approaches multi-carrier (CP-OFDM). In order to effectively reduce PAPR, the system may have a limit on the maximum number of DFTs, which may be related to the system bandwidth and/or carrier frequency, for example, the larger the system bandwidth, the larger the maximum number of DFTs; the smaller the carrier frequency, the larger the maximum number of DFTs. Optionally, the maximum number of DFTs supported by the system is predefined or semi-statically configured by cell system information.

In addition, the system may have a limitation on the minimum size of the DFT, where an excessively small minimum size of the DFT may not have a large effect on reducing the PAPR, and an excessively large minimum size of the DFT may reduce the flexibility of resource allocation, i.e., the minimum bandwidth allocable in the frequency domain. The maximum size of DFT is the maximum reception bandwidth of the UE, related to the UE capability. Optionally, the minimum size, the maximum size, or the set of available sizes of the DFT are predefined, or semi-statically configured by cell system information, or semi-statically configured by UE-specific RRC signaling.

Optionally, in order to simplify the implementation of the transmitting end of the base station, the number of DFTs and the size of each DFT are not changed in a period of time, and are not related to data scheduling. The number of DFTs and the size of each DFT may be predefined or semi-statically configured through higher layer signaling.

Alternatively, the number of DFTs and the size of each DFT may vary within each slot and even within each symbol, depending on the data scheduling, for the system to reduce PAPR as much as possible. The number of DFTs and the size of each DFT are dynamically variable and can be dynamically indicated by either Cell-Specific DCI or UE-group Specific DCI.

Optionally, in order to reduce PAPR as much as possible, the system has the same size of each DFT in one OFDM symbol, i.e. the frequency domain allocated bandwidth is the same for all UEs. Assuming that the time domain resource scheduling unit of the UE is a slot, the size of the DFT in all OFDM symbols in a slot is the same, but each slot may use different number of DFTs and their corresponding sizes.

In one possible embodiment, a schematic block diagram of a M-DFT-S-OFDM based downlink multiple access technique is shown in FIG. 2. The above description related to fig. 1 can be applied to fig. 2, and the only difference between fig. 2 and fig. 1 is that in fig. 1, the frequency domain data of two UEs can be close to each other, but in fig. 2, an interval should be reserved between the frequency domain data of two UEs, which is designed to make the time domain waveform closer to the single carrier characteristic, thereby further reducing PAPR.

Optionally, the guard bandwidth between two UE data is related to the minimum of the DFT sizes used by two UEs, e.g., the larger the minimum of the DFT sizes used by two UEs, the larger the guard bandwidth is required.

In one possible embodiment, a schematic block diagram of a M-DFT-S-OFDM based downlink multiple access technique is shown in FIG. 3. The above description of fig. 1 can be applied to fig. 3, and fig. 3 is different from fig. 1 in that data of multiple UEs can be multiplexed in one DFT, that is, DFT transform is performed on data of a group of UEs, for example, data of UE1 and UE2 are multiplexed together before DFT transform, a DFT-transformed signal is a mixture of the two data, and if an input before DFT is called as a virtual resource, that is, UE1 and UE2 use different virtual resources of the same DFT and are mapped to frequency domain subcarriers after DFT transform, so as to share the same frequency domain resource.

In fig. 3, before performing DFT transform at point M1, more specifically, before serial-to-parallel transform, data of UE1 and UE2 may be multiplexed together by "concatenation or interleaving". When the data are multiplexed together in a serial manner, that is, the data of the UE1 and the UE2 are concatenated, that is, they can be mapped to the virtual resources of DFT in a centralized manner, and the data of the two can be separated by the sampling point of the time domain; when multiplexed together by interleaving, i.e., the data of UE1 and UE2 are scrambled, i.e., can be distributively mapped onto the virtual resources of DFT, each sampling point in the time domain mixes the data of both.

For fig. 3, the PDCCH may need to indicate the virtual resources occupied before DFT transform in addition to the frequency domain resources occupied by the PDSCH when scheduling the PDSCH.

In one possible embodiment, a schematic block diagram of a M-DFT-S-OFDM based downlink multiple access technique is shown in FIG. 4. The above-mentioned description of fig. 2 can be applied to fig. 4, and fig. 4 is different from fig. 2 in that there is a zero padding operation before DFT transform, i.e. the input of partial virtual resources of DFT is 0, and the zero padding ratios of the DFTs of two UEs have correlation, e.g. the sum of the zero padding ratios of two UEs should be 1, i.e. the zero padding ratio of the DFT of UE1 is α ∈ (0,1), then the zero padding ratio of the DFT of UE2 is β ═ 1- α; also the zero padding positions of the DFTs of two UEs have relevance, e.g. the zero padding positions of two UEs should be complementary to each other, i.e. UE1 is zero padded on the input of the first alpha proportion of the DFT, then UE2 is zero padded on the input of the last 1-alpha proportion of the DFT. This design may achieve orthogonal separation of the data for UE1 and UE2 within one OFDM symbol in the time domain.

As shown in fig. 4, the second half of the virtual resource input of the DFT at M1 point is 0, that is, the data of UE1 occupies the first half of the virtual resource of the DFT, and the first half of the virtual resource input of the DFT at M2 point is 0, that is, the data of UE2 occupies the second half of the virtual resource of the DFT, so that orthogonal separation of two UEs can be achieved within one OFDM symbol in the time domain, as shown in fig. 5, the first half of the signal of the time domain waveform of one OFDM symbol is the data of UE1, and the second half of the signal is the data of UE2, and such a waveform orthogonally separated in the time domain is closer to the single carrier characteristic, and the PAPR can be effectively reduced. In the conventional uplink DFT-S-OFDM system, the time domain waveform of one OFDM symbol is a single carrier waveform of one UE data, and here, the time domain waveform of one OFDM symbol is a concatenation of the single carrier waveforms of two UE data.

Alternatively, the zero padding ratio of the DFT (which is also the time domain ratio in one OFDM symbol) may determine the corresponding ratio according to the ratio of DFT sizes, for example, the time domain ratio of the UE1 in one OFDM symbol is M1/(M1+ M2), and the time domain ratio of the UE2 in one OFDM symbol is M2/(M1+ M2), that is, when the DFT Size used by the UE is relatively larger, the time domain ratio in one OFDM symbol is larger, and the zero padding ratio of the DFT is also larger. This way of allocating based on DFT Size ratio can reduce PAPR as much as possible.

Fig. 4 is only a simple diagram and can be easily extended to transmit data of more UEs using multiple DFT, i.e., multiple UEs are orthogonally multiplexed in the frequency domain while being orthogonally time-multiplexed within one OFDM symbol in the time domain.

For fig. 4, when the PDCCH schedules the PDSCH, it may need to indicate the zero-padded position and proportion before DFT transform in addition to the frequency domain resources occupied by the PDSCH.

In one possible embodiment, a schematic block diagram of a M-DFT-S-OFDM based downlink multiple access technique is shown in FIG. 6. The above description related to fig. 4 can be applied to fig. 6, and the difference between fig. 6 and fig. 4 is that there is an interleaving process after zero padding and before DFT transformation, and after the interleaving process, the data of two UEs are distributed in the time domain in a cross manner, which has the advantages of better fighting against inter-cell interference, randomizing the interference, and improving the transmission performance.

With respect to fig. 6, when the PDCCH schedules the PDSCH, in addition to indicating the frequency domain resources occupied by the PDSCH, it may also need to indicate the position and proportion of zero padding before DFT transform, and indicate whether there is interleaving processing after zero padding for the input of DFT and before DFT transform, and indicate possible interleaving patterns.

Here, it should be understood by those skilled in the art that the above fig. 1-4 and fig. 6 describe the M-DFT-S-OFDM-based downlink multiple access technology by way of example only, and should not be construed as limiting the present invention, which is applicable to any structure of the M-DFT-S-OFDM-based downlink multiple access technology.

In one example, the system provides that the UE always occupies all the virtual resources of the DFT, and then the virtual resource allocation information within the DFT need not be indicated by extra signaling. In another example, the system provides that data of multiple UEs can be multiplexed in one DFT, and/or zero padding with different proportions can be provided in the DFT, so that the virtual resource location of the DFT needs to be indicated through extra signaling, the data of multiple UEs are multiplexed in one DFT to reduce the number of DFTs on the base station side, thereby reducing the PAPR, and the zero padding with different proportions is provided in the DFT to allow orthogonal separation of signals of UEs in the time domain, thereby allowing the time domain waveform to exhibit single carrier characteristics, so as to further reduce the PAPR.

Fig. 7 is a schematic device diagram of a user equipment 1 and a base station 2 for PDSCH resource allocation in an M-DFT-S-OFDM-based high-frequency communication system according to an embodiment of the present invention, where the user equipment 1 includes an information obtaining device 11 and a PDSCH resource determining device 12, and the base station 2 includes an information transmitting device 21. Specifically, the information transmitting means 21 of the base station 2 transmits frequency domain resource allocation information and virtual resource allocation information within DFT to the user equipment 1, so that the user equipment 1 determines PDSCH resources according to the frequency domain resource allocation information and the virtual resource allocation information within DFT, and accordingly, the information acquiring means 11 of the user equipment 1 acquires the frequency domain resource allocation information and the virtual resource allocation information within DFT; the PDSCH resource determination device 12 determines PDSCH resources based on the frequency domain resource allocation information and the virtual resource allocation information in the DFT.

Specifically, the information transmitting means 21 of the base station 2 transmits the frequency domain resource allocation information and the virtual resource allocation information within the DFT to the user equipment 1, so that the user equipment 1 determines the PDSCH resources according to the frequency domain resource allocation information and the virtual resource allocation information within the DFT.

In the existing OFDM system, each input of the frequency domain before FFT is generally referred to as a Sub-carrier (Sub-carrier), and similarly, each input of the transform domain before DFT may also be referred to as a Sub-sample (Sub-sample). Here, the virtual resource allocation information within the DFT refers to input (referred to as virtual resource) allocation information of the DFT, or Sub-sample (each input of the DFT may be referred to as Sub-sample) allocation information of the DFT, or virtual resource allocation information occupied before DFT transform, or DFT transform domain resource allocation information.

Optionally, the granularity of the virtual resource allocation information within the DFT is configurable. The granularity of the virtual resource allocation information within the DFT can be to include

A sub-sample group of consecutive sub-samples, each UE may occupy one or more sub-sample groups of the DFT.

May be fixed or may be configurable. In addition to this, the present invention is,

the value of (d) may have a correlation with the DFT Size, e.g., the larger the DFT Size,

the larger the value of (d), the smaller the DFT Size,

may be smaller, the system may specify the DFT Size that may be used for different intervals, respectively

Value or

A set of values.

The system is based on

Cutting the whole DFT Size into

Sub-sample groups, here

Is the Size of the DFT, and is the total number of available sub-samples of the DFT, since

May not be covered

Integer division, then remaining in DFT

The sub-samples may be input as 0 or occupied by a group of adjacent sub-samples. As shown in the figureAs shown in FIG. 8, the M-point DFT is divided into N sub-sample groups, each sub-sample group occupying M sub-samples, where

The remaining sub-samples are input as 0 or occupied with adjacent sub-sample groups SSG # N.

When in use

Will change, the number of sub-sample groups contained in the same size DFT will also change, and the number of bits in the DCI to indicate the virtual resource allocation within the DFT may also change, i.e. the UE is configured according to

The value determines the number of bits of the DCI field indicating the virtual resource allocation within the DFT.

In one example of the above-mentioned method,

is configured by cell system information, e.g. one is configured by cell system information

For all DFT sizes, or configure a group

The values of (c) are used for different (intervals) DFT Size, respectively.

In another example of the above-described method,

is configured by UE-sepcific RRC signalling, or by MAC CE, or by UE-specific RRC signalling and MAC CE joint configuration, e.g. by UE-specific RRC signalling configuring a set of

And further indicating the group by the MAC CE

One of the values.

In yet another example of the present invention,

is configured by DCI, and is indicated in the same DCI as the virtual resource allocation within the DFT,

the value of (d) and the virtual resource allocation in the DFT can be indicated separately by two independent DCI domains, or jointly indicated by using the same DCI domain in a joint coding manner, so as to reduce the signaling overhead. Here, the system may be configured based on a predefined or preconfigured set

The value of (c).

In yet another example of the present invention,

is configured by the DCI and is not indicated in the same DCI as the virtual resource allocation within the DFT, e.g.

The value of (D) may be specifically indicated by Cell-specific DCI or UE-group specific DCI. Here, the system may be configured based on a predefined or preconfigured set

The value of (c).

Optionally, to reduce the signaling overhead of virtual resource allocation within DFT within DCI, the system has a limit on the number of sub-sample groups that a UE can allocate and/or the location of the sub-sample groups, i.e. only support for

A partial number of sub-sample group assignments, and/or only partial supportThe sub-sample group position assignments of the possibilities. For example, the system provides that the UE can only occupy all or one of the subsamples of the DFT, and/or the system provides that the UE allocates virtual resources starting from the first subsample group at all times. Although signaling overhead of virtual resource allocation within DFT is reduced, flexibility of virtual resource allocation within DFT is reduced, and in order to reduce DCI signaling overhead while maintaining flexibility of allocation, a system may jointly indicate virtual resource allocation within DFT through UE-specific RRC signaling and DCI, pre-configure a set of the number of sub-sampling groups that can be allocated and/or a set of positions of the sub-sampling groups that can be allocated through UE-specific RRC signaling, and indicate a specific certain virtual resource allocation through DCI based on the pre-configured set. For example, the number of sub-sample groups is preconfigured by UE-specific RRC signaling, and the specific sub-sample group location is indicated by DCI.

In one embodiment, the information transmitting means 21 transmits the frequency domain resource allocation information, and the virtual resource allocation information within DFT, to the user equipment 1 according to any one of:

-transmitting DCI to a user equipment, wherein the DCI contains an indication of frequency domain resource allocation information and virtual resource allocation information within a DFT;

-transmitting higher layer signaling to the user equipment, wherein the higher layer signaling contains an indication on frequency domain resource allocation information, transmitting DCI to the user equipment, wherein the DCI contains an indication on virtual resource allocation information within the DFT;

-transmitting higher layer signaling to the user equipment, wherein the higher layer signaling contains an indication of virtual resource allocation information within the DFT, transmitting DCI to the user equipment, wherein the DCI contains an indication of frequency domain resource allocation information;

-transmitting higher layer signaling to the user equipment, wherein the higher layer signaling contains an indication of the frequency domain resource allocation size, transmitting DCI to the user equipment, wherein the DCI contains an indication of the frequency domain resource allocation location and the virtual resource allocation information within the DFT;

-transmitting higher layer signaling to the user equipment, wherein the higher layer signaling contains an indication of the relative size of the virtual resources within the DFT, transmitting DCI to the user equipment, wherein the DCI contains an indication of frequency domain resource allocation information and virtual resource allocation locations within the DFT;

-transmitting a first DCI and a second DCI to the user equipment, wherein the first DCI contains an indication of frequency domain resource allocation information, the second DCI contains an indication of virtual resource allocation information within a DFT, and the first DCI and the second DCI are different DCIs, the first DCI being a UE group DCI, a group of UEs transmitting the UE group DCI by the receiving base station using the same frequency domain resource and different virtual resources within the same DFT.

Accordingly, the information obtaining means 11 of the user equipment 1 obtains the frequency domain resource allocation information and the virtual resource allocation information within the DFT according to any one of the following:

-receiving DCI transmitted by a base station, wherein the DCI contains an indication of frequency domain resource allocation information and virtual resource allocation information within a DFT;

-receiving higher layer signaling transmitted by the base station, wherein the higher layer signaling contains an indication of frequency domain resource allocation information, receiving DCI transmitted by the base station, wherein the DCI contains an indication of virtual resource allocation information within the DFT;

-receiving higher layer signaling transmitted by the base station, wherein the higher layer signaling contains an indication of virtual resource allocation information within the DFT, receiving DCI transmitted by the base station, wherein the DCI contains an indication of frequency domain resource allocation information;

-receiving higher layer signaling transmitted by the base station, wherein the higher layer signaling contains an indication of the size of the frequency domain resource allocation, receiving DCI transmitted by the base station, wherein the DCI contains an indication of the frequency domain resource allocation location and the virtual resource allocation information within the DFT;

-receiving higher layer signalling transmitted by the base station, wherein the higher layer signalling contains an indication of the relative size of the virtual resources within the DFT, receiving DCI transmitted by the base station, wherein the DCI contains information about the frequency domain resource allocation and an indication of the virtual resource allocation location within the DFT;

-receiving a first DCI and a second DCI transmitted by a base station, wherein the first DCI contains an indication of frequency domain resource allocation information, the second DCI contains an indication of virtual resource allocation information within a DFT, and the first DCI and the second DCI are different DCIs, the first DCI being a UE group DCI, and a group of UEs transmitting the UE group DCI by the base station use the same frequency domain resource and different virtual resources within the same DFT.

The PDSCH resource determination device 12 determines PDSCH resources based on the frequency domain resource allocation information and the virtual resource allocation information in the DFT. Here, the virtual resource information allocation in the frequency domain determines physical transmission resources of the PDSCH, the virtual resource information allocation in the DFT determines actual and effective resource occupation of the PDSCH, the UE extracts and equalizes data on corresponding subcarriers based on the frequency domain resource allocation information, performs IDFT on the equalized frequency domain data, and then extracts data on corresponding subsamples based on the virtual resource allocation in the DFT for output of the IDFT for subsequent demodulation and decoding.

There may be various methods for the base station to indicate the frequency domain resource allocation information of the PDSCH and the virtual resource allocation information within the DFT to the user equipment. For example, when scheduling PDSCH, the base station transmits DCI to the user equipment, where the DCI includes indications about frequency domain resource allocation information and virtual resource allocation information in DFT, that is, the frequency domain resource allocation information and the virtual resource allocation information in DFT are indicated in the same DCI at the same time, that is, in the downlink M-DFT-S-OFDM system, compared with the existing downlink CP-OFDM system, the virtual resource allocation information in DFT needs to be additionally indicated in DCI scheduling PDSCH. In one example, the frequency domain resource allocation information and the virtual resource allocation information within the DFT are indicated separately using two separate DCI domains. In another example, the frequency domain resource allocation information and the virtual resource allocation information within the DFT are jointly indicated by joint coding using the same DCI domain to reduce signaling overhead. The frequency domain resource information allocation can directly reuse the method in the existing system, but the virtual resource allocation information in DFT needs new design.

For another example, the base station transmits a higher layer signaling to the UE, wherein the higher layer signaling contains an indication of the frequency domain resource allocation information, and transmits DCI to the UE, wherein the DCI contains an indication of the virtual resource allocation information in the DFT, so that the UE jointly determines the PDSCH resources according to the frequency domain resource allocation information indicated by the higher layer signaling and the virtual resource allocation information in the DFT indicated by the DCI. Here, the higher layer signaling indicating the frequency domain resource allocation information may be UE-specific RRC signaling or MAC CE, and the size of the frequency domain resource allocation is DFT size, that is, the DFT size is configured semi-statically through the higher layer signaling. In an ultrahigh frequency communication system, the time delay expansion of a wireless channel is very small, the selective gain of a frequency domain is not large, and the method for semi-statically indicating frequency domain resource allocation can effectively reduce the signaling overhead of a physical layer and has little influence on the performance of the system.

For example, the base station transmits a high layer signaling to the user equipment, wherein the high layer signaling contains an indication of the frequency domain resource allocation size, and transmits DCI to the user equipment, wherein the DCI contains an indication of the frequency domain resource allocation location and the virtual resource allocation information in the DFT. Here, the base station semi-statically indicates the frequency domain resource allocation information of the PDSCH through UE-specific RRC signaling or MAC CE, including the size (i.e., the number of PRBs) and the location of the frequency domain allocation, the number of subcarriers allocated in the frequency domain is the DFT size, and then dynamically indicates the virtual resource allocation information in the DFT through the DCI, and the UE determines the number of bits indicating the virtual resource allocation in the DFT in the DCI according to the size (i.e., the DFT size) of the semi-statically configured frequency domain resource allocation.

For example, the base station transmits a higher layer signaling to the user equipment, wherein the higher layer signaling contains an indication of the virtual resource allocation information in the DFT, and transmits DCI to the user equipment, wherein the DCI contains an indication of the frequency domain resource allocation information, so that the UE jointly determines the resources of the PDSCH according to the virtual resource allocation information in the DFT indicated by the higher layer signaling and the frequency domain resource allocation indicated by the DCI. Here, the base station indicates the virtual resource allocation information in DFT by UE-specific RRC signaling or MAC CE semi-statically, and since the Size of the frequency domain resource allocation is not determined, that is, the DFT Size is not determined, the base station may indicate only the relative virtual resource allocation information in DFT instead of the absolute virtual resource allocation information, for example, indicate the ratio and relative position of the virtual resources occupied in DFT, and the UE determines the DFT Size according to the Size of the frequency domain resource allocation indicated by DCI, thereby determining the absolute virtual resource position in DFT.

As another example, the base station transmits a higher layer signaling to the user equipment, wherein the higher layer signaling contains an indication of the relative size of the virtual resources within the DFT, e.g., a ratio to the DFT size, and transmits DCI to the user equipment, wherein the DCI contains an indication of the frequency domain resource allocation information and an indication of the virtual resource location within the DFT, so that the UE jointly determines the resources of the PDSCH according to the relative size of the virtual resources within the DFT indicated by the higher layer signaling and the frequency domain resource allocation information indicated by the DCI and the virtual resource location within the DFT. Here, the UE can know the virtual resource allocation information in the DFT according to the relative size of the virtual resource in the DFT indicated by the higher layer signaling and the virtual resource position in the DFT indicated by the DCI.

Optionally, the base station sends a first DCI and a second DCI to the UE, where the first DCI includes an indication about frequency-domain resource allocation information, the second DCI includes an indication about virtual resource allocation information in a DFT, and the first DCI and the second DCI are different DCIs, the first DCI is a UE group DCI, and a group of UEs that receive the DCI of the UE group sent by the base station use the same frequency-domain resource and different virtual resources in the same DFT. That is, the frequency domain resource allocation information of the PDSCH and the virtual resource allocation information in the DFT are not indicated in the same DCI, and the frequency domain resource allocation information and the virtual resource allocation information in the DFT may be respectively indicated by two DCIs, or even indicated by signaling of different layers, for example, the frequency domain resource allocation information is indicated by high-layer signaling semi-static, and the virtual resource allocation information in the DFT is indicated by DCI dynamically; or, the virtual resource allocation information in the DFT is indicated semi-statically through higher layer signaling, and the frequency domain resource allocation information is indicated dynamically through DCI. Here, the base station indicates, to a group of UEs, frequency domain resource allocation information of the PDSCH through UE-group specific DCI, the group of UEs share the same block of frequency domain resource allocation information, that is, are multiplexed in the same DFT, the UE-group specific DCI only includes the indication information of the frequency domain resource allocation information, the base station also indicates, to one UE, virtual resource allocation information within the DFT of the PDSCH through UE-group specific DCI, and the UE-group specific DCI also includes other scheduling information of the PDSCH, for example, scheduling information such as MCS, NDI, HARQ process, RV, and the like.

In one example, the UE-group specific DCI and the UE-group specific DCI are simultaneously transmitted in the same PDCCH search space, and if the UE receives only one of the two DCI, the scheduling information is incomplete, and the UE cannot receive the corresponding PDSCH.

In another example, the UE-group specific DCI and the UE-group specific DCI may be transmitted at different times based on different PDCCH search spaces, and when the UE receives the UE-group specific DCI indicating the virtual resource allocation in the DFT, the UE should jointly determine PDSCH resources for receiving PDSCH in combination with the UE-group specific DCI indicating the frequency domain resource allocation that is received most recently. Here, the PDCCH search space in which the UE-group specific DCI is located may have a longer listening period than the PDCCH search space in which the UE-group specific DCI is located.

Optionally, the UE jointly determines the PDSCH resources according to the DFT Size indicated by the higher layer signaling, the frequency domain resource location indicated by the DCI, and the virtual resource information allocation in the DFT. The DFT Size is the number of subcarriers allocated in the frequency domain, and may be obtained by multiplying the number of PRBs allocated in the frequency domain by the number of subcarriers included in one PRB, that is, the Size of frequency domain resource allocation is indicated by high layer signaling semi-statically, but the location of frequency domain resource allocation is indicated by DCI dynamically. In one example, the frequency domain resource location indication and the virtual resource allocation within the DFT are indicated within the same DCI, i.e., within the DCI scheduling the PDSCH. In another example, the frequency domain resource location indication and the virtual resource allocation within the DFT may be indicated within different DCIs, e.g., the former indicated by UE-group specific DCI and the latter indicated by UE-specific DCI, respectively.

In yet another alternative embodiment, the frequency domain resource allocation information of the PDSCH indicated by the DCI may reduce DCI signaling overhead by some methods, for example, limiting the size of the frequency domain resource allocation, that is, not all possible PRB numbers may be allocated. Here, the Size of the frequency domain resource allocation may also be referred to as DFT Size, i.e. not all possible DFT sizes are supported.

In one example, the size of the frequency domain resource allocation (i.e., the number of allocated PRBs) is configured semi-statically through higher layer signaling, and the location of the frequency domain resource allocation is configured dynamically through DCI. The Size of the frequency domain resource allocation may be configured through UE-specific RRC signaling, or configured through MA CE, or configured through UE-specific RRC signaling and MAC CE jointly, for example, a set of PRB numbers (or DFT Size) is configured through UE-specific RRC signaling, and then a certain value in the set is indicated through MAC CE. Assuming that the PDSCH only supports continuous PRB allocation in the frequency domain, only the starting PRB position needs to be indicated in the DCI.

In another example, the system semi-statically configures a set of the number of PRBs (or DFT Size) that the frequency domain resources can be allocated through higher layer signaling (UE-specific RRC signaling or MAC CE) and dynamically indicates the frequency domain resource allocation information of the PDSCH within the DCI based on the set.

Optionally, similar to the conventional frequency domain resource allocation, the allocation manner of the virtual resources in the DFT may be centralized or distributed, where centralized refers to that the virtual resources occupied by the UE are continuous, and distributed refers to that the virtual resources occupied by the UE are discrete. For virtual resource allocation within a centralized DFT, the system may indicate the starting sub-sample group location and the number of consecutively allocated sub-sample groups and jointly encode these two information to save signaling overhead. For the virtual resource allocation in the distributed DFT, one of the most flexible indication methods is to use bit-map (bit-map), that is, each indication bit corresponds to one sub-sample group, and each sub-sample group can be independently indicated whether to be occupied. In one example, the system supports both centralized and distributed virtual resource allocation for DFT and configures one of them through higher layer signaling (RRC layer signaling or MAC layer signaling); or one of them is indicated by DCI. The indication fields for virtual resource allocation within the DFT have different interpretation approaches for centralized and distributed. In another example, the system supports only centralized virtual resource allocation for DFT.

Alternatively, assuming that the resource scheduling granularity of the PDSCH in the time domain is a slot containing a plurality of OFDM symbols, the PDSCH may occupy the same number of sub-sample groups of DFT per OFDM symbol in one slot, but the occupied sub-sample group positions of DFT may be the same or different. In one example, within each OFDM symbol of a slot, there is a certain correlation between the virtual resource positions of the DFT occupied by the UE, the virtual resource allocation within the DFT indicated by the DCI is only used for the first OFDM symbol within the slot, and the virtual resource positions of the DFTs within other OFDM symbols can be derived from the virtual resource positions of the DFTs within the first OFDM symbol according to a predefined rule. For example, the virtual resource locations of the DFTs within different OFDM symbols continuously hop (hopping) throughout the DFT with a predefined rule, similar to the frequency hopping (frequency hopping) mechanism of the existing system, i.e., the UE hops to the virtual resource locations of different DFTs within the same slot, which is called intra-slot hopping. Similarly, such hopping of virtual resources within a DFT may also be applied to inter-slot (inter-slot), i.e., a UE hops to a virtual resource location of a different DFT in different slots.

In an alternative embodiment, if there is a process of interleaving the DFT input before DFT conversion in the system, the user equipment 1 further comprises a first receiving means (not shown), and the base station 2 further comprises a first transmitting means (not shown). Specifically, the first transmitting means of the base station 2 transmits the interleaving information in DFT to the user equipment 1, and accordingly, the first receiving means of the user equipment 1 receives the interleaving information in DFT transmitted by the base station 2, and the PDSCH resource determining means 12 determines the PDSCH resources according to the frequency domain resource allocation information, the virtual resource allocation in DFT, and the interleaving information in DFT.

Optionally, before DFT conversion, the base station performs interleaving processing on DFT inputs, that is, the DFT inputs are rearranged according to a certain rule and then perform DFT conversion, where interleaving may break up data of multiple UEs multiplexed in DFT or break up data of UEs and zero padding signals, so as to improve the interference resistance of the PDSCH. The virtual resource allocation information in the DFT is used for indicating virtual resources occupied by the UE before interleaving, the UE performs de-interleaving on the output of the IDFT at a receiving end, and then data on corresponding sub-samples after de-interleaving is taken out according to the indicated virtual resource allocation in the DFT for demodulation and decoding. That is, the system indicates not only the virtual resource allocation information in the DFT but also the interleaving information in the DFT, and the UE determines the PDSCH resources jointly based on the virtual resource allocation information in the DFT and the interleaving information and frequency domain resource allocation information in the DFT.

In one example, the interleaving information within the DFT is dynamically indicated by the DCI. Such as activating or deactivating interleaving of the DFT, or indicating one of a predefined plurality of interleaving patterns. The interleaving information in the DFT and the virtual resource allocation information in the DFT may be indicated in the same DCI, for example, separately indicated by two different DCI domains, or jointly indicated by the same DCI domain in a joint coding manner, so as to reduce signaling overhead; the interleaving information in DFT and the virtual resource allocation information in DFT may be respectively indicated in different DCIs, for example, the former is indicated by cell-specific DCI or UE-group specific DCI, the latter is indicated by UE-specific DCI, and the two may scramble the corresponding CRC using different RNTI values.

In another example, the interleaving information within the DFT is indicated by higher layer signaling (UE-specific RRC signaling or MAC CE). Such as activating or deactivating interleaving of the DFT, or indicating one of a predefined plurality of interleaving patterns.

In yet another example, the interleaving information in DFT is indicated jointly by higher layer signaling and DCI. For example, interleaving of DFT is activated or deactivated through higher layer signaling, and when interleaving of DFT is activated, one of a plurality of predefined interleaving modes is indicated through DCI.

In another alternative embodiment, if there is a zero padding process for the DFT input before DFT conversion in the system, the user equipment 1 further comprises a second receiving means (not shown) and a position determining means (not shown), and the base station 2 further comprises a second transmitting means (not shown). Specifically, the second transmitting device of the base station 2 transmits the zero padding information in DFT to the user equipment 1, and correspondingly, the second receiving device of the user equipment 1 receives the zero padding information in DFT transmitted by the base station 1; the position determining device determines a sub-sampling position with zero input in DFT according to zero padding information in DFT to assist PDSCH detection.

Optionally, if zero padding processing is performed on the DFT input before DFT conversion in the system, the base station further needs to send zero padding information in the DFT to the user equipment, so that the user equipment determines a sub-sampling position where the input in the DFT is zero according to the zero padding information in the DFT to assist PDSCH detection, and improve detection performance of the PDSCH.

In one example, the system specifies that only one UE's data is contained in one DFT at most, and the input of the DFT may be zero-padded with a fixed or variable ratio, so that the input on the sub-samples of the DFT other than the virtual resource actually occupied by the UE data is zero, i.e. no extra signaling is required. Here, the indication of the virtual resource allocation within the DFT may be implemented in a manner of indicating the proportion and relative position of the virtual resources of the occupied DFT. Optionally, the system always defaults to zero input on sub-samples outside the virtual resources of the DFT occupied by the UE. Optionally, the system indicates through higher layer signaling that the UE occupies zero input on the sub-samples outside the virtual resources of the DFT, for example, through cell system information indication, or through UE-specific RRC signaling indication.

In another example, the system provides that data of multiple UEs may be contained in one DFT, and the input of the DFT may be zero-padded with a fixed or variable ratio, then zero-padded information of the DFT, i.e. the sub-sampling positions where the input of the DFT is zero, needs to be indicated through extra signaling.

The virtual resource allocation information in the DFT and the zero padding information of the DFT have direct correlation, the assignable sub-samples of the UE are sub-samples except for the sub-sample with zero input, if the ratio of the sub-samples with zero input is high, the assignable sub-sample ratio of the UE is low, if the ratio of the sub-samples with zero input is low, the assignable sub-sample ratio of the UE is high, and the UE can determine the number of bits and/or the interpretation mode of the DCI field indicating the virtual resource allocation in the DFT according to the indication information of the zero padding operation of the DFT. Preferably, the system indicates the zero padding information of DFT semi-statically through UE-specific RRC signaling, including indicating the zero padding ratio and/or zero padding position of DFT, and then dynamically allocates the sub-samples occupied by the UE based on the sub-samples except for zero padding, that is, indicates the virtual resource allocation on the sub-samples except for zero padding through DCI.

In one example, zero padding information within the DFT is dynamically indicated by the DCI. Such as activating or deactivating zero padding operations for the DFT, or indicating one of a predefined variety of proportions and a variety of relative positions. The zero padding information in the DFT and the virtual resource allocation information in the DFT may be indicated in the same DCI, for example, separately indicated by two different DCI domains, or jointly indicated by the same DCI domain in a joint coding manner, so as to reduce signaling overhead; the zero padding information in the DFT and the virtual resource allocation information in the DFT may be respectively indicated in different DCIs, for example, the former is indicated by cell-specific DCI or UE-group specific DCI, the latter is indicated by UE-specific DCI, and the two may scramble the corresponding CRC with different RNTI values.

In another example, the zero padding information within the DFT is indicated by higher layer signaling (UE-specific RRC signaling or MAC CE). Such as activating or deactivating zero padding operations for the DFT, or indicating one of a predefined variety of proportions and a variety of relative positions.

In yet another example, zero padding information within the DFT is indicated jointly by higher layer signaling and DCI. For example, zero padding operation of DFT is activated or deactivated through higher layer signaling, and when the zero padding operation of DFT is activated, one of predefined multiple proportions and multiple relative positions is indicated through DCI.

In yet another alternative embodiment, one DCI may schedule PDSCH of a group of multiple UEs at the same time, the PDSCH of the multiple UEs using the same frequency domain resource (i.e. sharing the same block of frequency domain resource) and using different virtual resources within the same DFT, i.e. this DCI is a UE-group specific DCI that a group of UEs simultaneously listen to and receive, and the RNTI value for scrambling CRC is also a dedicated RNTI value, which is different from the C-RNTI value of the existing system. The base station can multiplex a group of UE with close service characteristics in the same DFT for scheduling, and configures a unique UE index in the group for each UE through high-level signaling, and the UE determines the virtual resource position of the corresponding DFT according to the UE index in the group.

In one exampleIn the sub-system, the virtual resources allocated in the DFT by a group of UEs sharing the same frequency domain resource allocation are all the same in size, and the virtual resources are sequentially allocated according to the UE indexes in the group, that is, the virtual resources of the DFT are equally allocated to a group of UEs and are sequentially allocated according to the UE indexes in the group, as shown in fig. 8, the virtual resources of the DFT at M points are equally divided by N UEs, each UE occupies M sub-samples, where M sub-samples are occupied

The remaining sub-sample inputs are 0 or occupied by neighboring UE # N, so that the UE can determine PDSCH resources according to the frequency domain resource allocation information indicated in the DCI and the UE index in the group without indicating virtual resource allocation information in DFT in the UE-group specific DCI for scheduling PDSCH of a group of UEs at the same time.

Optionally, the UE-group specific DCI for scheduling PDSCH of a group of UEs simultaneously may also schedule only one or more of the group of UEs, for example, a bit map (bit-map) is included in the DCI, each bit corresponds to one UE, 1 indicates that the UE has corresponding PDSCH transmission, 0 indicates that the UE does not have corresponding PDSCH transmission, and the UE determines the corresponding indication bit according to its own UE index in the group. The method can ensure the flexibility of scheduling, namely scheduling can be carried out without waiting for all the UE to have downlink data transmission, but the method has the defect of possible resource waste.

In another example, the sizes of the virtual resources allocated in the DFT by a group of UEs sharing the same frequency domain resource allocation have no correlation, but the locations of the virtual resources have correlation, for example, the relative virtual resource locations of the group of UEs in the DFT are sequentially allocated according to the UE indexes in the group, then the UE-group specific DCI for PDSCH scheduling a group of UEs simultaneously as described above may indicate the size of the virtual resources of the DFT occupied by each UE without indicating the locations of the virtual resources, i.e., each UE has an indication field of the virtual resource size of the corresponding DFT, which are sequentially arranged according to the UE indexes in the group in the DCI. Alternatively, the size of the virtual resource of the DFT of the last UE in the group need not be indicated, and may be derived from the size of the virtual resource in the DFTs of other UEs in the group, for example, by default using sub-samples other than those allocated by other UEs.

In another example, the size and location of the virtual resources allocated in the DFT by a group of UEs sharing the same frequency domain resource allocation do not have any correlation, and the UE-group specific DCI of the PDSCH simultaneously scheduling a group of UEs indicates the virtual resource allocation in the DFT of each UE, including the size and location allocation of the virtual resources, that is, each UE has a corresponding virtual resource allocation indication field in the DFT, and the indication fields are sequentially arranged in the DCI according to the UE indexes in the group. Alternatively, the virtual resource allocation in the DFT of the last UE in the group need not be indicated, and may be derived from the virtual resource allocation in the DFTs of other UEs in the group, e.g. by default using sub-samples other than those allocated by other UEs.

The method includes steps S1 and S2.

Specifically, in step S1, the base station 2 sends frequency domain resource allocation information and virtual resource allocation information in DFT to the user equipment 1, so that the user equipment 1 determines PDSCH resources according to the frequency domain resource allocation information and the virtual resource allocation information in DFT, and accordingly, the user equipment 1 obtains the frequency domain resource allocation information and the virtual resource allocation information in DFT; in step S2, the user equipment 1 determines PDSCH resources from the frequency domain resource allocation information and the virtual resource allocation information within the DFT.

Optionally, in step S1, the base station 2 sends the frequency domain resource allocation information and the virtual resource allocation information in DFT to the user equipment 1 according to any one of the following items:

-transmitting a first DCI and a second DCI to the user equipment, wherein the first DCI contains an indication of the frequency domain resource allocation information, the second DCI contains an indication of the virtual resource allocation information within the DFT, and the first DCI and the second DCI are different DCIs, the first DCI being a UE group DCI, and a group of UEs transmitting the UE group DCI by the receiving base station use the same frequency domain resource and different virtual resources within the same DFT.

Accordingly, in step S1, the user equipment 1 acquires the frequency domain resource allocation information, and the virtual resource allocation information within the DFT, according to any one of:

-receiving a first DCI and a second DCI transmitted by a base station, wherein the first DCI contains an indication of frequency domain resource allocation information, the second DCI contains an indication of virtual resource allocation information within a DFT, and the first DCI and the second DCI are different DCIs, the first DCI being a UE group DCI, and a group of UEs, which the base station transmits the UE group DCI, uses the same frequency domain resource and different virtual resources within the same DFT.

Optionally, if there is a process of interleaving the input of DFT before DFT conversion in the system, the method further includes step S3 (not shown). The user equipment 1 further comprises first receiving means (not shown) and the base station 2 further comprises first transmitting means (not shown). Specifically, in step S3, the base station 2 transmits interleaving information in DFT to the user equipment 1, and accordingly, the user equipment 1 receives interleaving information in DFT transmitted by the base station 2, and in step S2, the user equipment 1 determines PDSCH resources based on the frequency domain resource allocation information, virtual resource allocation in DFT, and interleaving information in DFT.

Optionally, if there is a zero padding process for the DFT input before DFT conversion in the system, the method further includes step S4 (not shown) and step S5 (not shown), where the user equipment 1 further includes a second receiving device (not shown) and a position determining device (not shown), and the base station 2 further includes a second transmitting device (not shown). Specifically, in step S4, the base station 2 transmits zero padding information in DFT to the user equipment 1, and accordingly, the user equipment 1 receives the zero padding information in DFT transmitted by the base station 1; in step S5, the user equipment 1 determines a sub-sampling position where the input is zero in DFT based on the zero padding information in DFT to assist PDSCH detection.

It should be noted that: the PDSCH resource allocation method in the M-DFT-S-OFDM based high-frequency communication system and the PDSCH resource allocation device in the M-DFT-S-OFDM based high-frequency communication system provided in the above embodiments belong to the same concept, and the specific implementation process thereof is described in detail in the device embodiment and is not described herein again.

Those skilled in the art will appreciate that the present invention includes apparatus directed to performing one or more of the operations described in the present application. These devices may be specially designed and manufactured for the required purposes, or they may comprise known devices in general-purpose computers. These devices have stored therein computer programs that are selectively activated or reconfigured. Such a computer program may be stored in a device (e.g., computer) readable medium, including, but not limited to, any type of disk including floppy disks, hard disks, optical disks, CD-ROMs, and magnetic-optical disks, ROMs (Read-Only memories), RAMs (Random Access memories), EPROMs (Erasable Programmable Read-Only memories), EEPROMs (Electrically Erasable Programmable Read-Only memories), flash memories, magnetic cards, or optical cards, or any type of media suitable for storing electronic instructions, and each coupled to a bus. That is, a readable medium includes any medium that stores or transmits information in a form readable by a device (e.g., a computer).

It will be understood by those within the art that each block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by computer program instructions. Those skilled in the art will appreciate that the computer program instructions may be implemented by a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, implement the features specified in the block or blocks of the block diagrams and/or flowchart illustrations of the present disclosure.

Those of skill in the art will appreciate that various operations, methods, steps in the processes, acts, or solutions discussed in the present application may be alternated, modified, combined, or deleted. Further, various operations, methods, steps in the flows, which have been discussed in the present application, may be interchanged, modified, rearranged, decomposed, combined, or eliminated. Further, steps, measures, schemes in the various operations, methods, procedures disclosed in the prior art and the present invention can also be alternated, changed, rearranged, decomposed, combined, or deleted.

Claims

1. A method for allocating Physical Downlink Shared Channel (PDSCH) resources realized at a User Equipment (UE) end comprises the following steps:

and determining PDSCH resources according to the frequency domain resource allocation information and the virtual resource allocation information in the DFT.

2. The method of claim 1, wherein frequency domain resource allocation information is obtained, and the virtual resource allocation information within the DFT comprises any one of:

-receiving DCI transmitted by a base station, wherein the DCI contains an indication of the frequency domain resource allocation information and the virtual resource allocation information within the DFT;

-receiving higher layer signaling transmitted by a base station, wherein the higher layer signaling contains an indication of the frequency domain resource allocation information, receiving DCI transmitted by the base station, wherein the DCI contains an indication of virtual resource allocation information within the DFT;

-receiving higher layer signaling transmitted by a base station, wherein the higher layer signaling contains an indication of virtual resource allocation information within the DFT, receiving DCI transmitted by the base station, wherein the DCI contains an indication of the frequency domain resource allocation information;

-receiving higher layer signalling transmitted by a base station, wherein the higher layer signalling contains an indication of the frequency domain resource allocation size, receiving DCI transmitted by the base station, wherein the DCI contains an indication of the frequency domain resource allocation location and virtual resource allocation information within the DFT;

-receiving higher layer signalling transmitted by a base station, wherein the higher layer signalling contains an indication of the relative size of virtual resources within the DFT, receiving DCI transmitted by the base station, wherein the DCI contains an indication of the frequency domain resource allocation information and the virtual resource allocation position within the DFT;

-receiving a first DCI and a second DCI transmitted by a base station, wherein the first DCI contains an indication of the frequency domain resource allocation information, the second DCI contains an indication of the virtual resource allocation information in the DFT, and the first DCI and the second DCI are different DCIs, the first DCI is a UE group DCI, and a group of UEs receiving the DCI of the UE group transmitted by the base station use the same frequency domain resource and different virtual resources in the same DFT.

3. The method of claim 1 or 2, wherein the granularity of virtual resource allocation within the DFT is configurable.

4. The method of claim 1 or 2, wherein if there is a process of interleaving the input of the DFT prior to the DFT transform in the system, the method further comprises:

-receiving interleaving information within the DFT transmitted by the base station;

wherein determining PDSCH resources according to the frequency domain resource allocation information and the virtual resource allocation information in the DFT comprises:

-determining PDSCH resources based on the frequency domain resource allocation information, virtual resource allocation within the DFT and interleaving information within the DFT.

5. The method of claim 1 or 2, wherein if there is a zero padding process on the input of the DFT prior to the DFT transform in the system, the method further comprises:

receiving zero padding information in DFT sent by the base station;

and determining a sub-sampling position with zero input in the DFT according to zero padding information in the DFT so as to assist PDSCH detection.

6. The method of claim 1, wherein if one DCI schedules PDSCH of multiple UEs at the same time, the multiple UEs use the same frequency domain resource and different virtual resources within the same DFT.

7. A method for allocating Physical Downlink Shared Channel (PDSCH) resources realized by a base station end is disclosed, wherein the method comprises the following steps:

and sending frequency domain resource allocation information and virtual resource allocation information in DFT to user equipment, so that the user equipment determines PDSCH resources according to the frequency domain resource allocation information and the virtual resource allocation information in DFT.

8. The method of claim 7, transmitting frequency domain resource allocation information to a user equipment, and virtual resource allocation information within DFT comprising any of:

-transmitting DCI to the user equipment, wherein the DCI contains an indication of the frequency domain resource allocation information and the virtual resource allocation information within the DFT;

-transmitting higher layer signaling to the user equipment, wherein the higher layer signaling contains an indication of the frequency domain resource allocation information, transmitting DCI to the user equipment, wherein the DCI contains an indication of the virtual resource allocation information within the DFT;

-transmitting higher layer signaling to the user equipment, wherein the higher layer signaling contains an indication of virtual resource allocation information within the DFT, transmitting DCI to the user equipment, wherein the DCI contains an indication of the frequency domain resource allocation information;

-transmitting higher layer signaling to the user equipment, wherein the higher layer signaling contains an indication of the frequency domain resource allocation size, transmitting DCI to the user equipment, wherein the DCI contains an indication of the frequency domain resource allocation location and virtual resource allocation information within the DFT;

-transmitting higher layer signaling to the user equipment, wherein the higher layer signaling contains an indication of the relative size of virtual resources within the DFT, transmitting DCI to the user equipment, wherein the DCI contains an indication of the frequency domain resource allocation information and the virtual resource allocation location within the DFT;

-transmitting a first DCI and a second DCI to the user equipment, wherein the first DCI contains an indication of the frequency domain resource allocation information, the second DCI contains an indication of the virtual resource allocation information within the DFT, and the first DCI and the second DCI are different DCIs, the first DCI is a UE group DCI, and a group of UEs receiving the UE group DCI by the base station use the same frequency domain resource and different virtual resources within the same DFT.

9. The method of claim 7 or 8, wherein if there is a process of interleaving the input of DFT prior to DFT transform in the system, the method further comprises:

-sending the interleaving information within DFT to the user equipment.

10. A user equipment for Physical Downlink Shared Channel (PDSCH) resource allocation, wherein the user equipment comprises:

11. The user equipment of claim 10, wherein the information acquisition means is configured to either:

12. The user equipment of claim 10 or 11, wherein the granularity of virtual resource allocation within the DFT is configurable.

13. The user equipment according to claim 10 or 11, wherein if there is a process of interleaving the input of DFT before DFT transform in the system, the user equipment further comprises:

first receiving means for receiving interleaving information in DFT sent by a base station;

wherein the PDSCH resource determining means is configured to:

14. The user equipment according to claim 10 or 11, wherein if there is a process of zero-padding the input of DFT before DFT transform in the system, the user equipment further comprises:

a second receiving device, configured to receive zero padding information in DFT sent by the base station;

and the position determining device is used for determining the sub-sampling position with zero input in the DFT according to the zero padding information in the DFT so as to assist the PDSCH detection.

15. The UE of claim 10, wherein if one DCI schedules PDSCH of multiple UEs at the same time, the multiple UEs use the same frequency domain resource and different virtual resources within the same DFT.

16. A base station for allocating Physical Downlink Shared Channel (PDSCH) resources, wherein the base station comprises:

17. The base station of claim 16, wherein the information transmitting means is configured to either:

18. The base station of claim 16 or 17, wherein if there is a process of interleaving the DFT input before DFT conversion in the system, the base station further comprises:

and the first sending device is used for sending the interleaving information in the DFT to the user equipment.

19. A system for physical downlink shared channel, PDSCH, resource allocation, wherein the system comprises a user equipment according to any of claims 10-15 and a base station according to any of claims 16-18.