RU2818161C1 - Device and method of allocating resources in time domain based on their aggregation - Google Patents

Abstract

FIELD: wireless communication.

SUBSTANCE: base station (TRP) allocates a predetermined number of adjacent OFDM symbols for transmission of a physical downlink control channel (PDCCH); allocates a time interval unit (TTI) containing a set of contiguous time intervals (sub-TTI) including a predetermined number of OFDM symbols. Each sub-TTI in the TTI is assigned an identifier (HARQ ID). Allocates a subset of contiguous sub-TTIs within the TTI for transmitting a physical downlink shared channel (PDSCH) to a user equipment (UE). Reserves a TTI for transmitting the PDSCH to the user device by transmitting to the user equipment PDCCH, in which downlink control information (DCI) is carried, including information allowing to determine identifiers of all sub-TTIs in the TTI; and transmits PDSCH to user equipment in said sub-TTI.

EFFECT: providing lower buffering requirements at the base station when scheduling downlink transmission with aggregation of time domain resources and easier preparation of downlink control information DCI, as well as reduced delay by enabling downlink transmission of new data using time resources not used for scheduled downlink data transmission until completion of the aggregated unit of time intervals TTI.

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Description

FIELD OF TECHNOLOGY TO WHICH THE INVENTION RELATES

The present invention relates generally to wireless communications and, more particularly, to devices and methods for allocating resources in the time domain based on aggregation.

BACKGROUND ART

At the present stage, there is an increasingly active deployment ^{of 5th} generation (5G) wireless communication networks of the New Radio (NR) standard, the advantages and capabilities of which are widely known.

At base stations (Transmission-Reception Point, TRP) in the 5G NR system, massive antenna arrays containing multiple transceiver antenna elements are used, which make it possible to effectively implement MIMO (“multiple-input-multichannel-output”) technology when transmitting data (for example, physical Downlink shared data channel (PDSCH)) a number of simultaneously transmitted spatial MIMO streams or MIMO layers are formed.

The digital signal is transmitted or received using one or more digital ports connected to the antenna elements of the base station, using a radio frequency unit that performs the function of converting the digital signal to analog and vice versa. Thus, for the 3.5 GHz frequency range, up to 64 digital antenna ports can be used, allowing base stations to use various spatial digital signal processing schemes. For example, using spatial multiplexing (SM) technology, it is possible to reuse the same time- frequency resources to transmit multiple signals (MIMO layers) to one or more user equipment (UE), and using technology adaptive beamforming provides dynamic focusing of the transmitted signal power in one or more specified directions. By using advanced modulation techniques such as Orthogonal Frequency Division Multiplexing (OFDM) modulation, efficient wideband signal transmission is achieved. OFDM ensures orthogonality of signals simultaneously transmitted on different subcarriers. Spatial MIMO layers are generally not orthogonal, and signals transmitted in different MIMO layers cause mutual interference at the receiver end. To reduce mutual interference, various adaptive beamforming techniques are used at the transmitter and receiver.

Accordingly, the transmitted MIMO layers are properly received by user devices that also support these technologies.

Multiple MIMO layers transmitted from the base station may be transmitted to one UE, in which case it is single-user MIMO (SU-MIMO), or may be transmitted to different UEs, in which case it is multi-user MIMO ( MU-MIMO).

To enable communication between various devices in a 5G NR system, including base stations and user devices, reference signals (RS) are used. One such reference signal is the demodulation reference signal (DMRS). DMRS signals are transmitted only as part of the corresponding physical channel resources (specifically the following physical data channels: PDSCH and physical uplink shared data channel (PUSCH)). More specifically, a different DMRS signal is associated with each of the simultaneously transmitted spatial MIMO layers PDSCH/PUSCH; In addition, the same adaptive spatial signal processing (precoding) is used for the DMRS signal and the corresponding MIMO layer. Each DMRS signal in a 5G NR communication system is associated with a unique index (number) called a DMRS port. Thus, for example, each PDSCH spatial MIMO layer transmitted from a TRP in a 5G NR communication system has a unique DMRS port assigned to it; therefore, the number of MIMO layers is equal to the number of DMRS ports.

The transmission sequence of multiple spatial MIMO layers together with DMRS signals is illustrated in FIG. 1.

Figure 1 shows a simplified diagram of spatial processing at the transmitter, where at the first stage adaptive spatial signal processing is carried out, converting the input signal of MIMO layers into a signal of digital antenna ports. At the same time, the corresponding spatial processing in OFDM systems can be carried out in the frequency domain, which allows for flexible formation of different radiation patterns on different subcarriers. Following the digital spatial processing procedure, an analog beamforming procedure is applied to convert the digital port input signal into signals from the physical subarray antennas. Analog beamforming is carried out in the time domain for the entire OFDM signal, which imposes restrictions on the number of simultaneously formed beams.

The main purpose of DMRS signals is to ensure coherent reception of physical data channels (PDSCH and PUSCH). More specifically, during passage through the communication channel, each of the transmitted MIMO layers is subject to various types of distortions, and to receive a given MIMO layer, a channel estimation procedure is carried out on the receiver side, the algorithms of which use the DMRS signal corresponding to this MIMO layer .

To transmit multiple DMRS signals of the corresponding MIMO layers, multiplexing of signals across resource elements (REs) is used, where each RE is defined by a subcarrier in the frequency domain and an OFDM symbol in the time domain. In the context of multiplexing DMRS signals in 5G NR, two types of DMRS structures are supported: Type 1 DMRS structure and Type 2 DMRS structure. In a Type 1 DMRS structure, a maximum of 8 DMRS signals are multiplexed, i.e. a maximum of 8 DMRS ports are defined to transmit 8 spatial MIMO layers. In a Type 2 DMRS structure, a maximum of 12 DMRS signals are multiplexed, i.e. a maximum of 12 DMRS ports are defined to transmit 12 spatial MIMO layers.

Therefore, the 5G NR communication system supports a maximum of 12 spatial MIMO layers on the TRP side. It should also be noted here that although up to 12 MIMO layers are generally supported on the base station side, in SU-MIMO mode a maximum of 8 MIMO layers are supported, i.e. No more than 8 MIMO layers can be transmitted to one UE at a time.

Next, FIGS. 2a to 2c illustrate methods for allocating time resources in a 5G NR wireless communication system at a physical layer.

The 5G NR system supports two types of time resource allocation schemes for transmitting a physical data channel: Type A and Type B. Figure 2a shows the first approach (Type A), in which the minimum unit of time resource allocation, i.e. The transmission time interval (TTI) for PDSCH transmission is one downlink (DL) slot (DL slot) consisting of 14 OFDM symbols. Similarly, the TTI for PUSCH transmission is one uplink (UL) slot (UL slot). Type A is characterized by a limited ability to vary the starting OFDM symbol (from 0 to 3) of the data channel within a slot.

Type A is typically used for enhanced mobile broadband (eMBB) traffic, which corresponds to, for example, regular Internet traffic in smartphones.

Figure 2b illustrates another of the time resource allocation types used in 5G NR, namely Type B, in which the TTI, i.e. The granularity of the planned transmission duration is a minislot. Here, within a slot, a user may be allocated one or more PDSCH transmissions, each with a duration of one mini-slot of 2 (as shown in FIG. 2b), 4 or 7 OFDM symbols. Typically associated with each of these PDSCH transmissions is a physical downlink control channel (PDCCH), each minislot also containing DMRS signals (not shown in FIG. 2b). The same is true for PUSCH broadcasts. This type, in particular, is characterized by greater flexibility in varying the starting symbol of the data channel (from 0 to 12) within a slot.

Type B is typically used for ultra-reliable low-latency communications (URLLC) traffic, which is mostly used for communications in industrial applications (eg between robots, etc.) where fidelity/reliability and latency requirements are high.

Figure 2c illustrates an example of the distribution of time resources according to the Type A scheme over a larger time period. This illustration generally refers to 5G NR time division duplex (TDD) systems, in which downlink and uplink transmissions use the same frequency band but at different times. In a TDD system, each 10 ms frame is divided into a number of downlink-uplink (DL/UL) periods, each of which includes an appropriate number of DL slots and UL slots, separated by a guard interval (GI) for providing the ability to switch between DL and UL and for transmission to UL with a time advance (Timing Advance). As can be seen from the illustrations in Fig. 2a, 2c, in each DL/UL slot, OFDM symbols are allocated for transmitting PDCCH and DMRS signals. It should be noted that the ratio between the number of DL slots and UL slots in the DL/UL period is flexible.

To ensure a one-to-one correspondence between transmissions originating from the TRP and received at the UE (and vice versa), 5G NR supports a Hybrid Automatic Retransmission Request (HARQ) procedure. According to this procedure, each TTI in both the uplink and downlink is assigned a special index called a HARQ ID. As illustrated in FIG. 2c, when the TRP schedules a PDSCH transmission to a UE in a specific slot (eg, the first from the left), the UE is previously informed by the PDCCH transmitted from the TRP of the HARQ ID S _i of the transmission scheduled therein. This information is carried out through downlink control information (DCI) carried on the PDCCH.

It should be noted here that in DCI, the user device is also informed about the PDSCH/PUSCH signal transmission parameters selected by the scheduler on the TRP side, information about the DMRS port numbers is transmitted, which should be used for demodulation of the transmitted MIMO layers of PDSCH, as well as for PUSCH transmission; In addition, the DCI may include other service information, such as information about the modulation and coding scheme (MCS), time domain resource allocation (TDRA), frequency domain resource allocation (FDRA), adaptive spatial signal processing, etc. P. The above information via DCI is relatively fast (in terms of low latency) since it is carried out at the physical layer; at the same time, transmission in a DCI message implies a limitation on the number of bits used (no more than 50-70 bits in 5G NR).

When scheduling a PDSCH transmission to the UE in any of the subsequent slots (eg, third from the left), the UE is also informed by the DCI of the HARQ ID S _j of that transmission. As stated above, the scheduler in the TRP schedules both UL transmissions, and FIG. 2c accordingly illustrates that when scheduling a PUSCH transmission from a UE in a specific UL slot (eg, the second from the right), the UE is informed by the DCI of the HARQ ID S _k scheduled in there are no transmissions. It should be emphasized here that in the case under consideration, planning of transmission resources is carried out on a per-slot basis.

If the UE successfully receives data transmitted on the PDSCH with HARQ ID S _i , then the UE sends a positive acknowledgment (ACK) on the physical uplink control channel (PUCCH) to the TRP regarding this transmission. If the UE receives data with HARQ ID S _j with an error in a certain slot, that is, this data cannot be successfully decoded at the UE, then the UE sends a negative acknowledgment (NACK) to the TRP via PUCCH regarding the transmission with HARQ ID S _j . Through the HARQ mechanism used, the TRP determines data that has not been properly received at the UE and which therefore needs to be retransmitted, and the UE determines on a per-transmission basis whether the transmitted data is new data or a retransmission of previously transmitted data. The retransmitted data is combined at the UE with previously received corresponding data that was decoded in error, and decoding is performed on the combined data.

It should be noted again that the frame, slot, mini-slot configurations shown are quite flexible in 5G NR, and FIGS. 2a-2c are provided for illustrative purposes only to provide a comprehensive understanding of the present application. It should also be noted that the disclosure in FIG. 2c above is equally applicable to the case where minislots are used as the TTI.

Aspects of the functioning of 5G NR wireless communication systems, briefly described above, are disclosed in detail in the specifications TS 38.211, 38.212 “NR; Physical channels and modulation”, v17.3.0, 2022-09-21, 3gpp.org, which are incorporated herein by reference in their entirety.

Although the deployment of 5G NR systems in the world is just beginning to gain momentum, active research is already underway in various directions to standardize next-generation wireless communication systems, the so-called. 6G, which will have characteristics superior to 5G NR.

In particular, for the 6G operating range 10-13 GHz (UPPER MID BAND), base stations (TRPs) are planned to support ultra-large antenna arrays, with at least 1024 antenna elements, hybrid analog and digital beamforming with a large number of antenna ports (≥ 128 ). Thus, with support, in particular, up to 64 simultaneously transmitted spatial MIMO layers in UPPER MID BAND communication systems, the concept of a radio interface with an ultra-large antenna array (Massive MIMO) will be taken to a fundamentally new level.

6G plans to support a set of reference signals similar to those used in 5G NR, such as DM-RS, CSI-RS, SRS, PT-RS, PSS/SSS. Details regarding the said RS are given in the above specifications. At the same time, approaches to working with reference signals used in 5G NR cannot always be extrapolated to next-generation wireless communication systems.

In particular, the above DMRS structures used in 5G NR systems can multiplex a maximum of 12 DMRS signals, while in a 6G system, the simultaneous transmission of at least 64 spatial MIMO channels and, accordingly, 64 DMRS signals must be ensured. In other words, existing DMRS structures cannot provide multiplexing of the number of DMRS signals required for 6G. Thus, new DMRS structures being developed for next-generation wireless communications systems (including 6G) must support more DMRS ports (up to 64), in addition to meeting other design requirements.

In this context, it must be taken into account that in view of the above requirement to increase the capacity of the DMRS structure (the ability to multiplex a larger number of DMRS signals for a corresponding larger number of MIMO channels), it will include a larger number of REs, including occupying a larger number of OFDM symbols in the time domain. If we use a distribution of time resources similar to 5G NR, then the relatively high DMRS transmission frequency characteristic of 5G NR will inevitably lead to an undesirable increase in overhead in the case of a more capacious DMRS structure.

Technical solutions related to resource allocation in the time domain for advanced communication systems are known in the prior art. A significant part of them is based on the use of longer TTIs when planning transmissions. Such technical solutions are proposed, in particular, in US 2019/0149365, US 10531452, US 9106418.

US 2019/0149365 proposes methods for allocating time domain resources in wireless communication systems. Embodiments disclosed in US 2019/0149365 include: defining time domain symbols and/or indicating them using a combination of DCI and higher layer signaling for PDSCH and PUSCH; allocating time domain resources for minislot level operations; rules for deferring and discarding for transmission in multiple minislots; collision processing against reference sounding signals with semi-statically or semi-persistently configured uplink transmissions. Essentially, a table-based approach is described to support temporary domain resource allocations with configurable durations. The disadvantage of the proposed approach in US 2019/0149365 in this context is that the actual transmission must be aligned with the specified allocation of time domain resources, resulting in increased complexity and latency.

According to the technical solution proposed in US 10531452, multiple TTIs can be resource scheduled for a mobile device using a downlink control message, some or all of the multiple TTIs can be associated with different HARQ processes. Each TTI may include data mapped to one transport block (TB), and each TB may be associated with a separate HARQ process. The downlink control message may include an indication of which HARQ processes are associated with resources of the set of TTIs scheduled by the message. For example, the downlink control message may include a bitmap that indicates the relationship between each HARQ process and each TTI scheduled by the message. Feedback for transport blocks of some TTIs may be different, and the acknowledgment of reception or successful decoding may depend on the timing of the transmission time intervals in relation to the control message. Thus, US 10531452 describes multi-TTI scheduling with multiple HARQ process identifiers per TTI. A disadvantage of the approach proposed in US 10531452 is that the actual number of scheduled TTIs is aligned with the TTIs indicated in the control message, resulting in increased complexity and latency.

US 9106418 proposes a method for transmitting data using HARQ, which provides for early termination of UL transmissions with a large number of repetitions. This solution is not applicable for high-speed services with long TTIs.

SUMMARY OF THE INVENTION

The objective of the present invention is to create a technique for allocating time domain resources for broadband data transmission based on their aggregation, which would allow, on the one hand, to avoid an increase in the overhead associated with DMRS, and, on the other hand, to avoid negative effects that may arise from the use of longer TTIs resulting from aggregation.

In the context of solving this problem, according to a first aspect of the present invention, a method for allocating resources in a time domain in a wireless communication system is provided. The proposed method comprises the following steps, carried out at a base station (TRP): selecting a predetermined number of contiguous OFDM symbols for transmission of a physical downlink control channel (PDCCH); allocate a block of time intervals (TTI) containing a set of contiguous time intervals (sub-TTI), each sub-TTI including a specified number of OFDM symbols, and each sub-TTI in the TTI is assigned an identifier, in the role which is preferably a HARQ ID; allocating, within the TTI, a subset of contiguous sub-TTIs for transmitting a physical downlink shared channel (PDSCH) to a user equipment (UE); reserving a TTI for transmission of the PDSCH to the user equipment by transmitting to the user equipment a PDCCH in which downlink control information (DCI) is carried, including at least information allowing identification of the identifiers of all sub-TTIs in the TTI; and transmitting the PDSCH to the user equipment in said sub-TTI subset. As noted earlier, a time slot (sub-TTI) can be a slot containing 12 or 14 OFDM symbols, or a mini-slot containing 2, 4 or 7 OFDM symbols. This information, which allows the identification of all sub-TTI identifiers, may be an array of sub-TTI identifiers of the reserved TTI. The proposed method also includes informing the user device about those sub-TTIs of the reserved TTI that are not included in the allocated sub-TTI subset.

According to an embodiment, the method further comprises executing on the user device the steps of: buffering received data from all sub-TTIs of the reserved TTI; and, for each of the sub-TTIs of the reserved TTI, decoding data corresponding to that sub-TTI from the buffer and sending a physical uplink control channel (PUCCH) acknowledgment to the base station. In this case, if decoding is successful, a positive acknowledgment (ACK) is sent as a receipt and the said corresponding data is removed from the buffer, and if decoding is unsuccessful, a negative acknowledgment (NACK) is sent as a receipt and the said corresponding data remains in the buffer. It should be emphasized here that decoding data from those sub-TTIs of a reserved TTI that are not included in the said sub-TTI subset is always unsuccessful.

Moreover, according to this embodiment, the method further comprises: executing at the base station in which, upon receiving a NACK regarding data transmitted to a sub-TTI from the sub-TTI subset, retransmitting this data to the user equipment; and executing on the user equipment, combining the retransmitted data received at the user equipment with data from a buffer corresponding to the sub-TTI, and decoding the combined data.

According to one embodiment, said notification may be an explicit notification comprising the step of transmitting, at the base station, as part of a subsequent DCI, the identifiers of all sub-TTIs of said sub-TTI subset, or the sub-TTI identifiers of TTIs that are not are included in the mentioned sub-TTI subset. According to this embodiment, the method further comprises, on the user equipment, the step of removing from the buffer, upon receipt of said subsequent DCI, data corresponding to sub-TTIs not included in said sub-TTI subset.

According to another embodiment, said information may be implicit information.

According to one possible implementation of this other embodiment, the proposed method further comprises starting a timer of a predetermined duration at the base station after said DCI transmission on the PDCCH and starting a timer of this predetermined duration at the user equipment upon receipt of the DCI taking into account the propagation time signal between the base station and the user device. The method also includes steps performed on the user device in which, upon expiration of a given predetermined timer duration: determining, as sub-TTIs from the TTIs not included in the said sub-TTI subset, those sub-TTIs for which devices to the base station have been NACKed and for which no retransmitted data has been received from the base station within said predetermined duration, thereby realizing said implicit informing; and removing data corresponding to these determined sub-TTIs from the buffer.

According to an alternative implementation of said other embodiment, the method further comprises starting a separate timer of a predetermined duration at the base station after transmission in each sub-TTI of the reserved TTI, and starting a timer of this predetermined duration at the user equipment upon receiving the data in This sub-TTI takes into account the signal propagation time between the base station and the user device. The method also comprises the steps performed on the user device in which: upon expiration of a given predetermined timer duration, the said sub-TTI is determined as a sub-TTI not included in the said sub-TTI subset if, with respect to the given sub-TTI from the user device, a NACK has been transmitted to the base station and no retransmitted data has been received from the base station within said predetermined duration, thereby realizing said implicit informing; and removing data corresponding to these determined sub-TTIs from the buffer.

Said predetermined timer duration is set at the base station and communicated, prior to said triggering, to the user device preferably via MAC signaling or RRC signaling.

According to an embodiment, the base station maintains a plurality of available identifiers that are available for sub-TTI assignment. After said reservation, the identifiers assigned to the sub-TTI of the reserved TTI are excluded from the set of available identifiers. The set of available identifiers is supplemented by identifiers for which ACKs from the user device were received at the base station. Finally, after the aforementioned information, the set of available identifiers is supplemented with sub-TTI identifiers that were not included in the mentioned sub-TTI subset.

According to this embodiment, a plurality of usable identifiers for sub-TTIs are maintained on the user device, data from which is buffered. When said data is buffered, the set of identifiers used is complemented by the sub-TTI identifiers of the reserved TTI. Sub-TTIs whose data is removed from the buffer are excluded from the set of used identifiers.

According to a second aspect of the present invention, there is provided a base station (TRP) in a wireless communication system, comprising at least: transceiver devices, data processing devices and data storage devices in which computer executable codes are stored, which, when executed by the data processing devices, cause the base station to perform a method according to the first aspect in an explicitly informed embodiment.

According to a third aspect of the present invention, there is provided a wireless communication system comprising at least a base station (TRP) comprising at least: transceiver devices, data processing devices and data storage devices, wherein the TRP is configured to communicate with a user equipment (UE), containing at least: transceiver devices, data processing devices and data storage devices, wherein computer-executable codes are stored in the TRP data storage device and computer-executable codes are stored in the UE data storage device, and when executing computer-executable codes by the TRP and UE data processing devices, the method is executed according to any embodiment of the first aspect of the present invention.

The technical result achieved by the present invention is to create an effective technique for allocating time domain resources based on flexible aggregation of slots or minislots, providing a larger unit of resource allocation/scheduling in the time domain, which, on the one hand, allows the use of less frequent transmissions DMRS and PDCCH and thereby, at a minimum, avoid an increase in overhead, which is especially important in the case of larger capacity DMRS structures for next generation communication systems, and, on the other hand, avoid the negative effects caused by the use of such an aggregated unit. More specifically, in the context of avoiding these negative effects, lower buffering requirements at the base station when scheduling downlink transmissions and simpler DCI preparation are provided, as well as reduced latency for downlink transmission of new data.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an illustrative diagram of spatial signal processing at the transmitter side; FIG.

FIGS. 2a-2c illustrate time resource allocation in 5G NR;

FIG. 3 is an illustrative diagram of a wireless communication system in which embodiments of the present invention may be implemented; FIG.

FIG. 4 illustrates an attempt to use a 5G NR approach to time resource allocation in a next generation wireless communication system; FIG.

FIGS. 5a, 5b illustrate exemplary embodiments of a general approach to aggregating time domain resources for the DL portion of a DL/UL frame period according to the present application;

6a, 6b are high-level views of the general approach to resource aggregation according to the present application;

FIG. 7 illustrates an embodiment of time domain resource aggregation to enable pipelining of code block processing at the receiver end according to the present application; FIG.

FIGS. 8a, 8b are a flow diagram of a method for allocating resources in the time domain in accordance with an embodiment of the general resource aggregation approach of the present application;

FIG. 9 illustrates the disadvantages associated with the aggregation of time resources in accordance with the general approach of the present application; FIG.

FIGS. 10a, 10b illustrate the concept of flexible allocation of time resources according to the present invention;

FIG. 11 is a detailed illustration of an embodiment of flexible time resource allocation according to the present invention, explicitly informing the UE of the time resources used for actual PDSCH transmission; FIG.

FIG. 12 is a general illustrative diagram of transmission exchange between a TRP and a UE according to an embodiment of the present invention; FIG.

FIG. 13 is an illustration of the flow of operations in explicitly informing the UE of the time resources used for actual PDSCH transmission, according to an embodiment of the present invention; FIG.

FIG. 14 illustrates a flowchart for implicitly informing a UE of the time resources used for actual PDSCH transmission, according to an embodiment of the present invention; FIG.

FIG. 15 is a flowchart of a method for flexible resource allocation in a time domain according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

Reference is now made to exemplary embodiments of the present invention, which are illustrated in the accompanying drawings, wherein like reference numerals denote like elements. It should be understood that embodiments of the invention may take various forms and should not be construed as limited to the descriptions given here. Accordingly, illustrative embodiments are described below with reference to the drawings to explain aspects of the present invention.

FIG. 3 generally illustrates a wireless communications system in which various aspects of the present invention may be implemented. As shown in FIG. 3, user equipments (UEs) 301 communicate with base stations (TRPs) 302 on a radio access network (RAN) 300. UEs 301 (eg, UEs 301-1, 301-2, 301-3, ...) distributed across the RAN 300, and each of the UEs 301 may be fixed or mobile. Well-known examples of UEs are smartphones, tablets, modems, etc.

Base stations 302 (eg, TRP 302-A, 302-B, 302-C) may provide radio coverage for a specific geographic area, often referred to as a “cell.” Base stations 302 are generally of a stationary design, but may also be of a mobile design. In general, base stations may be macro-TRP (as illustrated by TRPs 302-A, 302-B, 302-C in FIG. 3), as well as pico-TRP for pico cells or femto-TRP for femto cells. Cells, in turn, can be divided into sectors.

The operation of base stations 302 may be coordinated and controlled by a network controller in communication with them (eg, via a backhaul). The RAN 300 may be in communication with a core network (CN) (eg, through a network controller) that provides various network functions, such as, for example, access and mobility control, session management, authentication server function, application function, and the like. . However, base stations 302 in RAN 300 may also be connected to each other (eg, through a direct physical connection).

When a user device moves within the RAN 300, it may be handed over from one TRP to another TRP. For example, service to UE 301-3 may be transferred from TRP 302-B to TRP 302-A. This reconfigures the relevant UE operational parameters to operate with the new TRP. UE service switching can also occur between sectors of the same TRP.

The 5G NR wireless communication system implements the concept of cloud RAN (Cloud RAN, C-RAN), which consists of dividing the base station into three parts and using a special interface defined for exchanging information between these functional parts. Thus, the TRP can be divided into a radio unit (RU), which performs the functions of a radio transceiver, a distributed unit (DU) for L1 (physical layer) calculations and L2 (medium access control (MAC) layer) calculations, and a centralized unit (CU) for L2 and L3 (Radio Resource Control (RRC) layer) calculations. This separation allows the CUs to be centralized at the appropriate central network node, while the DUs can be more distributed at the cell sites. In this case, switching connections between cell sites can be carried out at the L1 level, that is, with relatively low delays. Support for this concept is expected in next-generation wireless networks.

It should be noted that the description in Figure 3 and the figure itself are for illustrative, non-limiting purposes only for the purpose of outlining the general operating environment of the present invention. Although FIG. 3 illustrates only the known basic components of a communication system, it should be understood that the communication system may further include a variety of other elements.

Each of the TRPs 302 shown in FIG. 3 includes hardware and logic to implement corresponding functions in the TRP. The hardware includes, in particular, an antenna array consisting of the transmit-receive antenna elements discussed above, various specially configured processors, controllers, data storage devices, other circuit elements, as well as the buses connecting them. Logic means includes software stored in the corresponding storage devices and configuring the corresponding circuit elements. Software also includes firmware directly embedded in processors and controllers. Said hardware is configured to, inter alia, perform various processing on the transmitted and received signals, including (de)modulation, (de)multiplexing, (de)coding, amplification, filtering, digitization, (de)interleaving, resource allocation, reception/transmission planning.

Likewise, each of the UEs 301 shown in FIG. 3 includes hardware and logic for implementing corresponding functions in the UE. The hardware includes, in particular, transceiver devices with associated antenna elements, various specially configured processor(s), controllers, data storage devices, other circuit elements, as well as the buses connecting them. Logic means includes software stored in the corresponding storage devices and configuring the corresponding circuit elements. Software also includes firmware directly embedded in the controllers. Said hardware is configured to, inter alia, perform various processing on the transmitted and received signals, including (de)modulation, (de)multiplexing, (de)coding, amplification, filtering, digitization, (de)interleaving. In addition, the UE contains user interaction facilities, including a touch screen, speakers/microphone, buttons, as well as user applications stored in the UE memory and executed by the UE processor in the associated operating system.

Examples of the above-mentioned processors/controllers include microprocessors, microcontrollers, digital signal processors (DSPs), field programmable gate arrays (FPGAs), discrete hardware chips, and the like. (Micro)software executed by processors/controllers should be interpreted broadly to mean machine-executable instructions, instruction sets, program code, code segments, subroutines, program modules, objects, procedures, and the like. The software is stored on suitable computer-readable media, which may be embodied, for example, in the form of RAM, ROM, EEPROM, solid-state memory, magnetic memory, optical memory, and the like. , on which corresponding program codes and data structures can be written or stored and accessed by the corresponding processors/controllers.

The above TRP and UE hardware and software elements are configured to enable the TRP and UE to perform the methods of this application that are described below. The actual implementation of TRP and UE component hardware and their specialized configuration, incl. by appropriate logical means is known in the art to which this application relates. In this case, various functions according to the methods corresponding to this application can be performed in a plurality of individual elements or one or more integral elements, which is determined by the design structural characteristics.

In view of the above discussion of the prior art, increasing the capacity of the new DMRS structure for next generation wireless communication systems (including 6G) results in such a structure occupying a larger number of OFDM symbols in the time domain. If we use 5G NR time resource allocation, for example, according to Type A, described with reference to Figs. 2a, 2c, then the presence of a more capacious DMRS structure along with a control channel in each slot will lead to an undesirable increase in overhead. This aspect is clearly illustrated in Fig. 4, from the right side of which it can be seen that for 6G PDSCH transmission there will only be 4 OFDM symbols left in the slot.

It should be recalled here that in Type A 5G NR, it is typically necessary to allocate at least one OFDM symbol for the DMRS signal(s) in each slot. Thus, a DMRS signal will be transmitted to the UE with every slot even if no change has occurred in the DMRS port allocation; also in each slot at least one symbol is occupied by the control channel.

Next, accordingly, improved techniques for allocating resources in the time domain are considered, which would avoid this negative effect.

First, with reference to FIGS. 5-8, a general aggregated approach to resource allocation in the time domain, both at the slot and mini-slot levels, is discussed.

As with 5G NR, from a macro-level perspective, a 10 ms frame is divided into a number of equal DL/UL periods, with the duration of the DL/UL period being configurable at the base station. A base station may communicate a predetermined DL/UL period length to the UEs it serves using the aforementioned DCI (L1) signaling, MAC (L2) signaling, RRC (L3) signaling, or even some combination thereof. Each DL/UL period is divided into slots, and each slot can consist of 14 or 12 (if the slot uses an extended cyclic prefix) OFDM symbols.

Typically, a portion of the DL/UL period slots is allocated to downlink (DL) transmission (DL portion), and another portion of the DL/UL period slots may be allocated to uplink (UL) transmission (UL portion). The DL part and the UL part are separated from each other by a guard interval (GI) to provide time for switching between DL and UL transmission and UL Timing Advance transmission. A portion of a slot in the DL part or UL part is usually allocated for the guard interval. It should be noted that the allocation of slots between the DL and UL parts is configurable at the base station - say, all OFDM symbols of the DL/UL period can be allocated only to the DL part.

In accordance with the general approach of the present application, aggregation of slots or minislots is carried out such that a larger time domain resource allocation/scheduling unit is introduced than an individual slot (Type A in 5G NG) or an individual minislot (Type B in 5G NG). That is, it is assumed that the allocation of time domain resources for data transmission can be carried out in such aggregated units.

Below, with reference to FIGS. 5a, 5b, exemplary embodiments of aggregation for the DL portion of a DL/UL period of a frame will first be described.

In FIG. 5a, the OFDM symbols constituting three slots of the DL portion of the DL/UL period are shown along the time axis. These slots are aggregated into a single bundle of slots, which constitutes a new time domain scheduling/allocation unit (TTI). Unlike the corresponding Type A 5G NR (see FIG. 2a), contiguous OFDM symbols allocated for Physical Downlink Control Channel (PDCCH) transmission are allocated on a per-block basis rather than per slot as in the case of Type A 5G NR.

One or more contiguous OFDM symbols are also allocated to convey the DMRS structure; such a set of adjacent symbols can be referred to below as a DMRS subblock. The DMRS structure multiplexes DMRS signals for the required number of MIMO layers of the transmitted PDSCH. Here, as a non-limiting example, one of the promising DMRS structures described in detail in patent RU2801697 can be used as a DMRS structure aimed at next generation communication systems, the disclosure of which is intended to be incorporated by reference in its entirety in the specification of the present application.

It should be emphasized that the DMRS subblock allocation shown in FIG. 5a is illustrative and other allocations thereof may be used. Then, the DMRS subblock size of 4 OFDM symbols shown in FIG. 5a also does not impose a limitation. Aspects of DMRS subblock allocation are described in detail in patent RU2801697.

The remaining OFDM symbols in the block of slots may be allocated for PDSCH transmission. Although FIG. 5a shows the allocation of all remaining symbols, it should be understood that fewer may be allocated for PDSCH transmission, as will be discussed in more detail below. Next, each slot in FIG. 5a is shown to contain 14 OFDM symbols; at the same time, as mentioned earlier, a slot can contain 12 OFDM symbols. These points do not impose any restrictions on the invention in question.

FIG. 5b shows, along the same time axis, the OFDM symbols constituting four minislots of the DL portion of the DL/UL period, each of which contains 4 OFDM symbols. These minislots are aggregated into a single block of minislots, which also constitutes a new time domain (TTI) scheduling/allocation unit. Unlike the corresponding Type B 5G NR (see FIG. 2b), contiguous OFDM physical downlink control channel (PDCCH) symbols, as in the case of FIG. 5a, are allocated per block of minislots rather than per minislot. , as in the case of Type B 5G NR. It should be noted that in the example under consideration, adjacent OFDM symbols allocated for PDCCH transmission precede the block of minislots, but are not part of it. There is no limitation to this, and a block of minislots may be arranged to include OFDM PDCCH symbols.

Similar to the discussion in Fig. 5a, a DMRS sub-block may also be allocated in the minislot block for transmitting DMRS signals. Here, for illustration purposes only, the DMRS subblock is shown occupying an entire minislot in the block of minislots following the PDCCH symbols.

The remaining OFDM symbols in the block of minislots may be allocated for PDSCH transmission. Although FIG. 5b shows the allocation of all remaining symbols, it should be understood that fewer may be allocated for PDSCH transmission.

Next, each minislot in FIG. 5b is shown to contain 4 OFDM symbols; at the same time, as mentioned earlier, a minislot may also consist of 2 or 7 OFDM symbols, and the DMRS subblock itself may be of a different size, as noted in relation to Fig. 5a, and not be aligned to minislot boundaries . These points do not impose any restrictions on the invention in question.

The minislot duration is generally set on the TRP and signaled from the TRP to the UE using an overhead message. For example, an RRC message or a DCI message can be used to indicate the duration of a minislot. A combination of RRC and DCI messages may also be used, where the RRC message specifies a subset of minislot duration values: for example, a subset of {2, 7} is specified from the aggregate set of {2, 4, 7, 14}, and the DCI message specifies one specific value from this subset (eg, 1 bit in DCI selects either 2 or 7) that is relevant to the current PDSCH transmission.

6a, 6b show the general aggregation approach in question from a macro-level perspective.

FIG. 6a illustrates the case where a block of slots or minislots occupies the entire DL portion, and FIG. 6b illustrates the case where a block of slots or minislots is preceded by a slot. For the embodiment of FIG. 6b, it should be emphasized that the above-mentioned OFDM symbols for the PDCCH are included in the previous slot, while this PDCCH contains overhead information for scheduling a block of slots/minislots. In other words, the presence of OFDM PDCCH symbols in a block of slots, as shown in FIG. 5a, is not mandatory according to the present application. The embodiment of Figure 6b can be considered as corresponding to a combination of the known approach (Type A 5G NR) and the general time resource aggregation approach discussed here. It should also be understood that a block of slots/minislots may be preceded by more than one slot; In addition, it is possible for a block of slots/minislots to precede one or more slots.

It should be explained that according to the general approach under consideration, the PDCCH can generally be located at any location in the DL/UL period according to the control channel decoding configuration. The main requirement is that for a particular UE, PDCCH transmission takes place before the start of a block of slots/minislots so that the UE can receive the control channel and decode the DCI, which will contain PDSCH scheduling information (including information about the start of transmission of a block of slots/minislots and its duration).

From the illustrations in Figs. 6a, 6b, the reduction in overhead can be clearly seen - thus, reserving OFDM symbol(s) for the PDCCH for each slot/minislot is avoided; It also makes it possible to use less frequent DMRS transmissions in the DL/UL period without reducing the quality of the channel estimate.

As noted above, scheduling of time domain resources for data transmission is carried out by the base station scheduler (TRP), and UEs are informed of the resources reserved by the scheduler through the downlink control channel transmitted from the TRP. According to the present invention, a block of slots or mini-slots can be used as a unit of scheduling/allocating time domain resources for transmission, as opposed to a single slot or mini-slot according to 5G NR. The aggregation configuration according to the present application is specified by the base station (TRP), and information about it (in particular, an indication of the start of a block of slots/minislots in the DL/UL period and its duration) is signaled to the UE in the PDCCH. According to a preferred embodiment, this information is at least partially conveyed in a DCI message carried on the PDCCH. It should be noted that the DCI may also signal other service information discussed above.

As the start of a block of slots/minislots, the DCI may indicate its starting OFDM symbol within the DL/UL period. The duration of a block of slots/minislots is set on TRP depending on the decision of the scheduler, which may depend on the size of the data transmitted to the user, the need to transmit data to another user, the type of traffic transmitted, the state of the channel (modulation, coding rate, number of MIMO layers), transmission of other scheduled signals, etc.

Next, channel coding is typically performed on the data to be transmitted on the PDSCH. Channel coding is block-based, and as a result, the encoded data is represented as code blocks of a certain length. A possible channel coding option is LDPC coding. The code blocks are then appropriately mapped to time- frequency and spatial resources for transmission on the PDSCH. Each code block is mapped to the entire time -frequency and spatial resources.

Moreover, if, when mapping code blocks to time -frequency resources, we directly apply the existing procedure for determining the number of code blocks for data transmission, which is described in the TS 38.212 5G NR specification, then this procedure will have to be applied to the entire block of slots/minislots according to this invention (eg the entire DL portion of a DL/UL period), and as a consequence, the timing of an integer number of code blocks will only be guaranteed to be consistent towards the end of such a block of slots/minislots. That is, if the existing approach is used directly, the timing boundaries of an integer number of code blocks will generally not be guaranteed to match the slot or minislot boundary. As a consequence, processing of received data cannot begin at the receiver side until the entire aggregated block of slots/minislots has been received. In other words, on the receiver side there is downtime associated with the need to buffer received code blocks while waiting for the end of receiving the aggregated block in order to begin processing them.

The general time domain resource aggregation approach discussed here eliminates this problem and improves the pipelining efficiency of receiver-side code block processing, as illustrated in FIG. 7.

According to a preferred embodiment, the number and length of code blocks are selected according to the duration of the minislot so that, when allocating time- frequency resources for each set of code blocks in the said number, the boundaries of this set in the time domain are aligned precisely with the boundaries of the minislot in block of minislots. More specifically, the number and length of code blocks are selected according to the number of available REs in a minislot, the modulation used, and the channel coding rate. Moreover, in the embodiment under consideration, the use of the aforementioned existing procedure for determining the number of code blocks described in the TS 38.212 5G NR specification is, in fact, carried out specifically in relation to each group of OFDM symbols constituting a minislot separately.

7 shows the alignment of sets of three code blocks along minislot boundaries in a block of minislots. As a consequence, data processing at the receiver can begin virtually immediately after receiving the first minislot containing three (ie, an integer) code blocks; then, upon receipt of the second minislot, the next three code blocks will be processed; etc. It is obvious that in the embodiment under consideration, downtime associated with processing of received data is reduced to a significant extent. It should also be noted that the considered embodiment is highly flexible, since, in addition to the length and number of code blocks, the duration of the minislot itself is flexibly configurable.

It should be emphasized that although the above embodiment is preferred for aggregation at the minislot level, it is equally applicable to aggregation at the slot level. Because of the above, if implemented at the slot level, there will obviously be greater latency than in the illustrated minislot case.

The time domain resource aggregation techniques of the present application described above with reference to FIGS. 5-7 with respect to the DL portion of a DL/UL period of a frame are also applicable to its UL portion. In this case, the specificity is that the TRP scheduler decision is the same for the DL part and the UL part, and the time domain resource allocation information for the UL part is also signaled on the physical downlink control channel (PDCCH), which mentioned above. Thus, the start and duration of UL transmission of a block of slots/minislots is selected on the TRP and signaled to the UE via overhead information in the PDCCH; more specifically, this selection is carried out by the TRP scheduler and signaling is carried out by the DCI on the PDCCH.

Accordingly, the uplink control channel, which in this case is the PUCCH, will have generally different functionality in relation to the downlink control channel. In particular, there is no mandatory requirement in the UL portion that the control channel precede the DMRS and PUSCH; Moreover, in the UL part there may be no uplink control channel at all.

Thus, in FIGS. 6a, 6b, for illustrative purposes only, the PUCCH is shown to be located at the tail of a block of slots/minislots and containing acknowledgment information (ACK/NACK). However, in the UL portion, OFDM symbols allocated to PUCCH may precede OFDM symbols allocated to DMRS and PUSCH. It should be emphasized that, in general, a block of slots/minislots according to the present invention can be essentially anywhere in the UL portion.

Since the PUCCH is not directly related to resource scheduling, it is possible that the PUCCH transmission will not be related to the block(s) of slots/minislots (or slots or minislots in general), for example, used to transmit a Scheduling Request or information channel state information (CSI), or when the PUCCH transmission will relate to previous slots, minislots or block(s) of slots/minislots.

An embodiment of an aggregated time domain resource allocation method 800 in accordance with the general approach of the present application will now be described with reference to FIGS. 8a, 8b. By way of illustration, method 800 is implemented at a base station (eg, TRP 302 of FIG. 3).

Discussed below with reference to FIG. 8a are steps 810-860 of method 800 performed with respect to the DL portion of a DL/UL frame period.

At step 810, a predetermined number of contiguous OFDM symbols are allocated for PDCCH transmission.

At step 820, a DL block of time slots is generated containing an integer number of contiguous time slots, each time slot including a predetermined number of OFDM symbols. In this case, the PDCCH, which must be carried in the OFDM symbols of the DL part allocated to it, refers to the entire block of time slots. According to the above disclosure, a time slot may be a slot which may contain 12 or 14 OFDM symbols, or a mini-slot which may contain 2, 4 or 7 OFDM symbols.

At step 830, at least one DL DMRS subblock is allocated to transmit DMRS signals for the required number of MIMO layers of the PDSCH.

At step 840, OFDM symbols are allocated in the DL slot block for PDSCH transmission.

Possible options for the relative arrangement of OFDM symbols for the PDCCH, DL DMRS subblock(s) and block(s) of slots/minislots in the DL part are indicated above, including with reference to Figures 5, 6.

At step 850, a DL block of slots is allocated for the scheduled DL transmission.

As has been repeatedly stated previously, the PDCCH, more specifically the DCI message, must carry overhead information. In addition to the service information discussed above, in the case under consideration the service information will include an indication of the beginning of the DL block of time intervals and the duration of the DL block of time intervals.

At step 860, for the data to be transmitted in the OFDM symbols allocated to the PDSCH in the DL block of time slots, the size and number of code blocks to perform channel coding (preferably LDPC) are determined and code blocks representing the encoded data are obtained. The number and length of code blocks are selected so that, when allocating time -frequency resources for each set of code blocks in the mentioned quantity, the boundaries of this set in the time domain are aligned with the boundaries of the time interval in the block of time intervals ( see Fig.7).

Discussed below with reference to FIG. 8b are steps 870-875 of method 800 performed with respect to the UL portion of the DL/UL period.

At step 870, a UL block of time slots is generated containing an integer number of contiguous time slots.

At step 871, at least one UL DMRS subblock is allocated to transmit DMRS signals for the required number of MIMO layers of the PUSCH.

At step 872, OFDM symbols are allocated in the UL slot block for PUSCH transmission.

At step 873, a predetermined number of contiguous OFDM symbols are allocated for PUCCH transmission.

Possible options for the relative arrangement of OFDM symbols for PUCCH, UL DMRS subblock(s) and block(s) of slots/minislots in the UL part are described above.

At step 874, a UL block of slots is allocated for UL transmission.

At step 875, similar to step 860, channel coding is performed on the data to be transmitted in the OFDM symbols allocated to the PUSCH in the UL block of time slots, selecting the number and length of code blocks accordingly.

It should be understood that the general approach to time domain resource allocation proposed herein is applicable to various future DMRS structures planned for use in next generation wireless communication systems.

Although the proposed aggregation technique described above with reference to FIGS. 5-8 provides a significant benefit in the context of next generation communication systems in that it reduces the overhead by avoiding the need to reserve OFDM symbol(s) for the control channel for each slot/minislot , as well as by making it possible to use less frequent DMRS transmissions without reducing the quality of the channel estimate, however, the use of this technique as such has certain disadvantages.

So, due to the fact that the scheduler in TRP is required to work at the slot/minislot block level, i.e. a longer TTI than an individual slot or mini-slot makes the scheduling it performs more difficult; in particular, more data needs to be buffered before the scheduler makes a decision.

In addition, an undesirable delay may occur, the nature of which is explained below with reference to FIG. 9. It should first be noted here that FIG. 9 generally corresponds to FIG. 6b. It should also be clarified that the transverse dotted lines shown in a slot/minislot block (SB/MSB) in FIG. 9 respectively indicate the slots/minislots from which the block is aggregated.

As noted earlier, particularly with reference to FIGS. 5-8, PDSCH transmission scheduling may be carried out in the TRP at a granularity of one SB/MSB, and the scheduler's decision regarding the scheduled transmission, as well as information about the start and duration of the SB/MSB, is reflected in the DCI, which must be transmitted to the UE via the PDCCH in advance. As a result, since the UE will treat the entire allocated SB/MSB of a prespecified duration as an actual PDSCH transmission, even if the data intended for the UE actually occupies only a portion of that SB/MSB, the TRP in turn will not be able to use the free portion (i) SB/MSB to send via PDSCH data that has arrived for transmission after said DCI has been generated for the UE. As a result, given the available time resources, the TRP will be forced to wait for the next DCI transmission opportunity to schedule the transmission of this newly arrived data, i.e. at a minimum - the completion of the mentioned SB/MSB (despite the fact that this possibility may generally only occur in the next DL/UL period). As a result, there is a delay and not entirely effective use of time resources.

The present invention is specifically aimed at eliminating this drawback and, accordingly, increasing the efficiency of use of time resources when aggregating them according to the general approach described above.

An inventive approach is described below with reference to FIGS. 10-15, which allows for more flexible allocation of time domain resources in the context in question.

10a, 10b provide a general illustration of the concept of time resource allocation according to the present invention.

Similar to the case in Figs. 6a, 6b, 9, a pre-allocation of a block of slots/minislots is carried out at the base station (TRP), i.e. A TTI of a specified duration for transmitting data via the PDSCH to a user equipment (UE). The transverse dotted lines in FIGS. 10a, 10b again denote the slots or mini-slots from which the TTI in question is aggregated. Each of such slots or mini-slots, respectively constituting a TTI, may be collectively referred to throughout this application as a sub-TTI. The start and end of a pre-allocated block of slots/minislots are therefore aligned to slot/minislot boundaries. As with 5G NR, each sub-TTI in a block has a HARQ ID associated with it (denoted as , x =0, …, D -1, in Fig. 10a). Also implied in this case is the improved pipelining approach to organizing data code blocks described above with reference to FIG. 7 (see also step 860 in FIG. 8a and step 875 in FIG. 8b). Finally, it should also be clarified that the illustrations of FIGS. 10-14 correspond to scheduling PDSCH transmission to a specific UE.

A DCI is generated at the base station, which reflects information regarding the pre-allocated TTI. In addition to the above-mentioned indication of the start and duration of the TTI, this information also includes information allowing the HARQ IDs of all sub-TTIs of the pre-allocated TTI to be determined at the UE side. Alternatively, this information may directly represent the entire array of HARQ IDs of these sub-TTIs, i.e. , x =0, …, D -1, in Fig. 10a. Alternatively, this information may be auxiliary data from which, at the UE side, the HARQ IDs of all sub-TTI TTIs pre-allocated to the TRP for PDSCH transmission may be calculated, for example, taking into account the start and duration of the TTIs reported in the DCI. As noted previously, the start of a TTI may be indicated by its starting OFDM symbol, and the duration of the TTI may preferably be the number of sub-TTIs in the TTI, or alternatively may be the end OFDM symbol of the sub-TTI. It should be emphasized that the specifics specified in this paragraph regarding the message to the user device of the beginning and end of the TTI and HARQ ID do not impose restrictions on the present invention, and other known approaches can be used. It should also be noted that, in accordance with the above, other service information is also included in the DCI, including regarding UL transmission scheduling.

The generated DCI is transmitted from the TRP to the UE via a PDCCH for which a predetermined number of contiguous OFDM symbols have been allocated to the TRP in the DL portion of the DL/UL period (see step 810 of FIG. 8a). Thus, the entire TTI becomes reserved for PDSCH transmission to the UE, and the UE is aware of this in the above manner.

In accordance with the present invention, the base station (TRP) is provided with the ability to start and stop actual data transmission over the PDSCH within the reserved TTI in a flexible manner, essentially at its discretion. In FIG. 10b, actual PDSCH transmission is shown starting at the first sub-TTI of the reserved TTI and ending before the TTI expires; in FIG. 10a, actual PDSCH transmission is shown starting after a number of sub-TTIs have elapsed from the start of the reserved TTI and ending again before the TTI has expired. In any case, the start and end of the actual PDSCH transmission are consistent with the boundaries of the slot or mini-slot representing the sub-TTI, ie, for example, by referring to the start of the actual transmission “optional” here, the start of any suitable sub-TTI in the TTI is meant. In other words, in the case under consideration, the situation occurs that the actual PDSCH transmission does not occupy all the time resources reserved for it, i.e. reservations were made with overbooking. According to the present invention, the UE is informed after the fact in which specific sub-TTIs the actual PDSCH transmission was carried out, which will be described in detail below.

With this flexible approach to starting/terminating the actual PDSCH transmission at the base station, it essentially splits multiple HARQ IDs reserved TTI into two subsets: , Where - a subset of the HARQ IDs of those sub-TTIs in which the actual transmission of the PDSCH to the UE occurs (indicated in Fig. 10a, 10b and on the left side of Fig. 11 by solid ovals), and - a subset of the HARQ IDs of those sub-TTIs in which actual PDSCH transmission to the UE is not carried out (indicated in Fig. 10a, 10b and on the left side of Fig. 11 by dotted ovals). Essentially a subset represents a supply of temporary resources for the TRP within a reserved TTI, which, thanks to the present invention, can be used by the TRP for other transmissions, for example, transmission of new data to another UE (see reference to Fig. 10b). However, the UE is not aware of this division either when reserving the TTI or during subsequent transmissions carried out with the TRP during it.

At the UE side, data is received for the entire TTI initially reserved for transmission, and the received data from each sub-TTI of that TTI is buffered, after which the UE attempts to decode it.

As noted above in the description of 5G NR, if the data is decoded successfully, it is forwarded to subsequent processing performed at the UE, and for the HARQ ID of the sub-TTI in which the data was transmitted, a positive acknowledgment (ACK) is sent from the UE to the TRP. (see Fig. 10b). This acknowledgment is preferably carried out via PUCCH. Although FIG. 10b shows the PUCCH transmission in the same DL/UL period as the PDSCH transmission, this does not limit the present invention - thus, in the considered DL/UL period, the PUCCH transmission may not be present and it may be performed in any -or from subsequent DL/UL periods.

In 5G NR, it is clear on the UE side that all time resources reserved for the UE must carry payload data, and failure to decode data from any slot or mini-slot would clearly indicate to the UE that the data was transmitted in error. . As a result, this 'erroneous' data remains in a buffer at the UE and for the HARQ ID of the corresponding slot or minislot, a negative acknowledgment (NACK) is similarly sent to the base station in the PUCCH, thereby requesting the base station to retransmit the data for that slot or minislot. Thanks to the HARQ ID, the base station knows for which slot/minislot data retransmission is required. The received retransmitted data is combined at the UE with the corresponding data in the buffer, and decoding is performed on the combined data.

Because according to the present invention, decoding at the UE data from any sub-TTI that is not used in the reserved TTI for actual PDSCH transmission to the UE (i.e., a sub-TTI with a HARQ ID from a subset ) must fail, then in the present invention there is inherent ambiguity on the UE side when performing the described TTI reception as to whether the unsuccessfully decoded data is 'faulty' data, i.e. useful data, the transmission of which was carried out with an error, or 'garbage' data, i.e. data from a sub-TTI that is not used for actual PDSCH transmission, for example, is used for transmission of other signals. In other words, the UE currently does not know in which specific sub-TTIs the actual PDSCH transmission occurs. However, as with 5G NR, at the UE, any unsuccessfully decoded data remains in a buffer and a NACK is sent to the base station on the PUCCH for the HARQ ID of the sub-TTI in which the data was transmitted. Again, as in the case of 5G NR, if a NACK is sent to the base station in relation to a sub-TTI with a HARQ ID from the subset , i.e. there was an error while transmitting payload data via the PDSCH, the base station will subsequently retransmit the data to the UE, and the UE will combine the retransmitted data with data from the buffer corresponding to the sub-TTI, and decoding of such combined data will be performed.

As noted above, according to the present invention, the UE is informed after the fact in which sub-TTIs of the reserved TTI the actual PDSCH transmission was not carried out.

In accordance with the present invention, two options for such information are provided - explicit information and implicit information.

In the case of explicit information, which is illustrated on the right side of Fig. 11, the base station transmits, as part of the subsequent DCI, all HARQ IDs of the subset , i.e. sub-TTIs of a previously reserved TTI in which no PDSCH transmission was performed to the UE. Alternatively, a subsequent DCI may instead report a subset HARQ ID, and since the UE is aware of the HARQ ID of all sub-TTIs, the UE can easily determine the subset based on this message . It should be understood that the reference here to 'subsequent DCI' is not intended to be limited specifically to the DCI whose transmission immediately follows the DCI transmission used for TTI reservation (see Figs. 10a, 10b, left side of Fig. 11) - for one skilled in the art, it should be It will be appreciated that the transmission of such a subsequent DCI may be preceded by the transmission of at least one other DCI.

From the right side of Fig. 11, it can be seen that the subsequent DCI transmitted on the PDCCH, similar to that shown in Figs. 10a, 10b and the left side of Fig. 11, is also used to reserve time resources with a margin for subsequent transmission of the PDSCH, with a similar purpose. slots/mini-slots of HARQ IDs from among them and conditional division of this set into corresponding subsets .

Moreover, at the UE, after receiving said subsequent DCI, all data corresponding to the sub-TTI with the reported HARQ ID from the subset , are removed from the buffer.

Implicit informing of the UE according to the present invention is carried out on the basis of timers, without directly communicating the corresponding HARQ IDs from the base station.

According to one embodiment of the present invention, after transmitting a DCI with reserved TTI information (see Fig. 10a, 10b, left part of Fig. 11), a timer of a predetermined duration is started at the base station, and a timer of this predetermined duration is started at the UE upon reception mentioned DCI. Naturally, the timer is started on the UE taking into account the signal propagation time between the base station and the UE. The duration of the timer is set at the base station and communicated to the UE in advance (ie, before starting), preferably via MAC signaling or RRC signaling.

The timer duration is initially set such that for all payloads from the sub-TTI with a HARQ ID from the subset , which could not be decoded by the UE and for which NACKs were sent from the UE to the base station, the base station will definitely have time to retransmit to the UE, and the UE will have time to decode the corresponding combined data. As a result, upon expiration of the timer on the user device, all data in the buffer for which retransmitted data was not received from the base station within the duration of the timer will be identified by the user device as 'garbage', i.e. as data from sub-TTI with HARQ ID from subset , and this data will be deleted from the user device's buffer. Therefore, timer expiration in the context in question implicitly informs the UE of the HARQ IDs of those sub-TTIs of the originally reserved TTI that were not used to actually transmit data to the UE via the PDSCH.

Another alternative embodiment for implicitly informing the UE is substantially the same as the above-described embodiment, except that at the TRP and at the UE, a separate timer of the same predetermined duration is associated with each sub-TTI of the reserved TTI and accordingly started. More specifically, after transmitting data in each sub-TTI, a separate timer of a given duration is started at the base station, and a separate timer of that duration is started at the UE upon receiving data in that sub-TTI. And in this embodiment, the start of the timer at the UE is carried out taking into account the propagation time of the signal between the TRP and the UE.

Similar to the previously discussed DCI-based timer-based embodiment, if a sub-TTI has received a NACK from the UE to the TRP due to failure to decode data received therein and no corresponding retransmitted data has been received from the TRP within the timer duration, then When the timer expires on the UE, this sub-TTI is identified by default as a sub-TTI with a HARQ ID from the subset . Again, all 'garbage' data corresponding to the sub-TTIs identified in this way are removed from the UE buffer.

Next, with reference to FIGS. 12-14, an embodiment of working with HARQ ID sets on the TRP side and on the UE side when implementing the present invention, embodiments of which have been disclosed above with reference to FIGS. 10-11, will be described. Meanwhile, FIG. 12 corresponds to a general flowchart of transmission exchanges between TRP and UE according to the present invention, FIG. 13 shows corresponding actions performed when explicitly informed according to the present invention, and FIG. 14 shows corresponding actions performed when informed implicitly according to the present invention. .

The TRP maintains a set of { A } available HARQ IDs, and the UE maintains a set of { U } usable HARQ IDs.

As previously disclosed with reference to FIGS. 10-11, the TRP initially pre-allocates a TTI for PDSCH transmission to the UE, assigning each sub-TTI (ie, slot or minislot) from which a given TTI is aggregated a HARQ ID (here x is essentially a sub-TTI ordinal symbol), and reserves this TTI by transmitting to the UE a DCI on the PDCCH containing information about the reserved TTI. Figure 12 illustrates transmission as part of a DCI array HARQ ID of all sub-TTIs of the reserved TTI.

In this case, after reservation, this set S _i is excluded from the set { A } of available HARQ IDs on the TRP: , position 1 in Fig. 13, 14. In general, the set { A } of available HARQ IDs corresponds to those sub-TTIs that can be used on the TRP to transmit new (i.e., not retransmitted) data, and the set { U } The HARQ ID used corresponds to those sub-TTIs from which received data is buffered at the UE. Since, in accordance with the above, the UE must buffer data from all sub-TTIs of the reserved TTI, then after receiving the DCI, the set { U } of used HARQ IDs on the UE is supplemented with the mentioned _{set Si} : , position 1 in Fig. 13, 14.

Then, in accordance with the disclosure in Fig. 10-11, the TRP performs the actual transmission of the PDSCH to the UE in a sub-TTI subset of the reserved TTI, being able to flexibly specify the start and end of this actual transmission. In this case, as mentioned above, the set S _i HARQ ID is conditionally divided on the TRP side into two subsets: , Where - a subset of the HARQ IDs of those sub-TTIs in which the actual PDSCH transmission is carried out, and - a subset of the HARQ IDs of those sub-TTIs that are not involved in the actual transmission of the PDSCH (i.e., in which 'garbage' data is transmitted from the UE's point of view); on the UE side this division is currently unknown. In FIG. 12, this transmission is designated as a PDSCH transmission in the sub-TTI with HARQ IDs from the subset .

The UE buffers received data from each sub-TTI of the reserved TTI and decodes it. If decoding buffered data corresponding to a sub-TTI with HARQ ID , completed successfully, then this data is deleted from the buffer and in relation to the sub-TTI with HARQ ID The UE sends an ACK via PUCCH to the TRP. A bunch of HARQ IDs that are positively acknowledged in this way are excluded from the set { U } of used HARQ IDs at the UE: , position 2 in Fig. 13, 14. At the same time, the set { A } of available HARQ IDs on the TRP is supplemented by this set : , position 2 in Fig. 13, 14. With respect to each of the sub-TTIs that contained the payload data transmitted in error (i.e., the sub-TTI with a HARQ ID from the subset ), and in relation to sub-TTIs that contained 'garbage' data for the UE (i.e. sub-TTIs with a HARQ ID from a subset ), the UE sends a NACK to the TRP and the corresponding data remains in the UE's buffer.

Then, in accordance with the disclosure in FIGS. 10-11, in the case of an embodiment of explicitly informing the UE, the TRP sends, as part of the subsequent DCI, subset information The HARQ IDs identified by the sub-TTIs were not used in the corresponding previously reserved TTI for PDSCH transmission to the UE (dotted arrow at the bottom of FIG. 12). At the same time, the set { A } of available HARQ IDs on TRP is supplemented with this subset : , position 3 in Fig.13. Since the UE, having received the said information, removes from the buffer the data corresponding to the sub-TTI with HARQ ID from the subset , then this subset of HARQ IDs is excluded from the set { U } of HARQ IDs used by the UE: , position 3 in Fig.13.

Position 4 in FIG. 13 corresponds to TTI reservation by said subsequent DCI, performing the same actions as position 1 in this figure.

Then, in accordance with the disclosure in FIGS. 10-11, in the case of an embodiment of implicitly informing the UE, timer(s) of predetermined duration are started on the TRP and on the UE. The illustration of FIG. 14 corresponds to a non-limiting example of starting a timer associated with DCI transmission. Although in FIG. 14 the timer is shown to expire in the next DL/UL period, this is also not a limitation to the present invention and timers of other durations may be used—say, a predetermined timer duration may span multiple DL/UL periods.

As stated in the above disclosure, at the UE, upon expiration of the timer, the HARQ IDs not used for actual PDSCH transmission in the previously reserved TTI are by default identified as those HARQ IDs for which NACKs were transmitted from the UE and during the duration of the timer with TRP Retransmitted data was not received. HARQ IDs identified in this way are designated as in Fig. 14. Since the UE removes from the buffer data corresponding to the sub-TTI with HARQ ID from the set , then this set of HARQ IDs is excluded from the set { U } of HARQ IDs used by the UE: , position 4 in Fig.14. At the same time, the set { A } of available HARQ IDs on TRP after the timer expires is supplemented with this subset : , position 4 in Fig. 14.

Position 3 in Fig. 14, similar to position 4 in Fig. 13, corresponds to TTI reservation via subsequent DCI with actions similar to position 1 in Fig. 13, 14.

An embodiment of a flexible time domain resource allocation method 1500 according to the present invention will now be described with reference to FIG. 15.

At step 1510, a base station (eg, TRP 302 of FIG. 3) allocates a predetermined number of contiguous OFDM symbols for PDCCH transmission, similar to step 810.

At step 1520, the base station allocates a block of slots/minislots (TTIs) containing a set of contiguous slots/minislots (sub-TTIs), where each sub-TTI includes a predetermined number of OFDM symbols. As stated earlier, a slot can contain 12 or 14 OFDM symbols, a mini-slot can contain 2, 4 or 7 OFDM symbols. Each sub-TTI in an allocated TTI is assigned a HARQ ID by the base station.

At step 1530, the base station allocates, within the TTI, a subset of contiguous sub-TTIs for PDSCH transmission to the UE (see Figs. 10a, 10b, 11).

At step 1540, the base station reserves the entire TTI (with a margin) for transmission of the PDSCH to the UE by transmitting to the UE a PDCCH that carries a DCI including at least information allowing the UE to determine the HARQ IDs of all sub-TTIs of the reserved TTI. According to an embodiment, the HARQ ID array of the sub-TTI of the reserved TTI is transmitted as said information to the DCI. As noted above, the DCI includes an indication of a TTI start and a TTI end, where the TTI start indication is preferably an indication of the TTI's starting OFDM symbol, and the TTI end indication is an indication of the number of sub-TTIs in the TTI.

At step 1550, the base station transmits a PDSCH to the UE in the sub-TTI subset. Preferably, this uses the organization of data code blocks transmitted on the PDSCH described above with reference to FIG. 7 (see also step 860 in FIG. 8a).

At step 1560, the UE buffers received data from all sub-TTIs of the TTI. Then, for each of the sub-TTIs, the UE decodes the data corresponding to that sub-TTI from the buffer and sends an acknowledgment to the base station via PUCCH. As noted earlier, when decoding is successful, an ACK is sent as an acknowledgment and the corresponding data is removed from the buffer, and when decoding is unsuccessful, a NACK is sent as an acknowledgment and the corresponding data remains in the buffer. Here it is necessary to emphasize once again that decoding ‘junk’ data, i.e. data from a sub-TTI not included in the sub-TTI subset allocated to the TTI in step 1530 for the PDSCH always fails at the UE and consequently sends a NACK.

At step 1570, the base station, upon receiving a NACK regarding data transmitted in any sub-TTI from the sub-TTI subset, retransmits that data to the UE. In this case, as mentioned earlier, during the initial transmission of data via PDSCH, an error occurred in the sub-TTI in question, i.e. it was useful but 'flawed' data. The UE, in turn, receives the retransmitted data and combines it with the remaining 'erroneous' data in the buffer corresponding to the said sub-TTI and decodes such combined data. The consistent identification of the corresponding sub-TTIs on the TRP and on the UE is, of course, accomplished through the HARQ IDs assigned by the base station at step 1520 and communicated by it to the UE at step 1540.

At step 1580, the UE is informed after the fact of those sub-TTIs from the TTI that are not included in the sub-TTI subset allocated at step 1530, i.e., in other words, those sub-TTIs that were not used in the TTI for transmission PDSCH to UE.

In accordance with the above disclosure, according to one embodiment of the present invention, this information can be implemented explicitly (see FIGS. 11-13), which corresponds to substep 1581 in FIG. 15. At sub-step 1581, the base station transmits to the UE, as part of the subsequent DCI, the sub-TTI HARQ IDs of the sub-TTI subset allocated at step 1530 for the PDSCH (i.e., the HARQ IDs constituting the sub-TTI ), or the HARQ IDs of those sub-TTIs that are not included in this subset (i.e., the HARQ IDs that make up the subset ). The UE, upon receipt of this subsequent DCI, removes from its buffer all data corresponding to sub-TTIs not included in the said sub-TTI subset, i.e. all data that turned out to be 'junk'.

According to another embodiment of the present invention, the notification of step 1580 may be implemented implicitly (see FIG. 14), which corresponds to substep 1582 of FIG. 15.

According to one embodiment of substep 1582, at the base station, after transmitting the DCI via the PDCCH in step 1540, a timer of a predetermined duration is started, and at the UE, upon receipt of this DCI and taking into account the signal propagation time between the base station and the UE, a timer of this timer is also started. predetermined duration. Upon expiration of this predetermined timer duration, the UE defaults to determine, as sub-TTIs not included in the subset of sub-TTIs allocated in the TTI at step 1530 for the PDSCH, those sub-TTIs for which at step 1570 from the UE to NACKs have been transmitted to the base station and for which no retransmitted data has been received from the base station within said predetermined duration. After which the 'garbage' data corresponding to the sub-TTI defined in this way is removed from the UE buffer.

According to an alternative implementation of sub-step 1582, a separate timer of a predetermined duration is started at the base station after transmission in each sub-TTI of the reserved TTI, and at the UE, upon receipt of data in that sub-TTI and taking into account the signal propagation time between the base station and the UE , a timer of this predetermined duration is also started. Upon expiration of this predetermined timer duration, the UE defaults to identifying the said sub-TTI as a sub-TTI not included in the sub-TTI subset allocated in the TTI at step 1530 for the PDSCH, if for this sub-TTI from the UE to the base station NACK was transmitted and no retransmitted data was received from the base station within said predetermined duration. After which, the 'garbage' data corresponding to all sub-TTIs defined in this way is removed from the UE buffer.

For both discussed embodiments of substep 1582, a predetermined timer duration is set at the base station and communicated, prior to its start, to the user device, preferably via MAC signaling or RRC signaling.

As discussed above with reference to FIGS. 12-14, the base station maintains a plurality of { A } HARQ IDs that are available for assignment to slots/minislots (sub-TTIs) for transmitting new data. After the reservation in step 1540, the HARQ IDs assigned to the sub-TTI of the reserved TTI are excluded from the set { A }. At the same time, the set { A } is supplemented with those HARQ IDs for which the base station received ACKs transmitted from the UE at step 1560. Finally, after informing at step 1580, the set { A } is supplemented with the HARQ IDs of those sub-TTIs which were not included in the mentioned sub-TTI subset, i.e. subset HARQ ID.

According to the subject disclosure, the UE maintains a plurality of { U } usable HARQ IDs for sub-TTIs, data from which is buffered. After buffering the data at step 1560, the set { U } is completed with the HARQ IDs of all sub-TTIs of the reserved TTI, i.e. set { S _i }. Accordingly, the HARQ IDs of those sub-TTIs whose corresponding data is removed from the UE buffer in steps 1560, 1580 are excluded from the set { U }.

Although not explicitly stated, it should be understood that method 1500 also performs (e.g., after step 1520) allocating at least one DMRS subblock for transmitting DMRS signals, similar to step 830.

According to a preferred embodiment, the flexible time resource aggregation approach of the present invention described above is applicable for wideband transmission where simultaneous transmission of multiple spatial MIMO layers of PDSCHs is supported. However, this preferred embodiment is not limited and the approach is equally applicable to single MIMO layer implementations. Naturally, the approach according to the present invention is fully applicable to 5G NR systems.

Moreover, although the embodiments disclosed above are illustrated in the context of TDD systems, it should be emphasized that the approach of the present invention is also applicable to frequency division duplex (FDD) systems in which downlink and uplink transmissions are used at any given time. different frequencies.

As can be seen from the above, the present invention provides less buffering requirements at the base station when scheduling downlink transmissions with time domain resource aggregation and simpler DCI preparation (e.g., TRP in light network scenarios can generate DCI without precise knowledge of resource size in the time domain), as well as reducing latency by allowing new data to be transmitted downstream using time resources not used for scheduled downstream data transmission before the completion of the aggregated TTI.

It should also be understood that the illustrated exemplary embodiments are merely preferred and not the only possible embodiments of the present invention. More precisely, the scope of the present invention is defined by the following claims and their equivalents.

Claims (82)

1. A method for allocating time domain resources in a wireless communication system, comprising the steps of: at the base station (TRP), allocating a predetermined number of contiguous OFDM symbols for transmission of a physical downlink control channel (PDCCH), allocating a block of time slots containing a set of contiguous time slots, each time slot including a predetermined number of OFDM symbols, wherein each time slot in a block of time slots is assigned an identifier, allocating a subset of contiguous time slots in the block of time slots for transmission of a physical downlink shared channel (PDSCH) to a user equipment (UE), reserving a block of time slots for PDSCH transmission to the user equipment by transmitting to the user equipment a PDCCH in which downlink control information (DCI) is carried, including at least information allowing identification of all time slots of the block of timeslots, and transmitting a PDSCH to the user equipment in said subset of time slots; And informing the user device about time slots of a block of time slots not included in said subset of time slots. 2. The method according to claim 1, further comprising the steps performed on the user device, in which: placing received data from time slots of the time slot block into a buffer; And, for each of the time slots of the time slot block, decode the data corresponding to this time slot from the buffer and send a receipt on the physical uplink control channel (PUCCH) to the base station, wherein if decoding is successful, a positive acknowledgment (ACK) is sent as said receipt and said corresponding data is removed from the buffer, if decoding is unsuccessful, a negative acknowledgment (NACK) is sent as said receipt and said corresponding data remains in the buffer, wherein decoding of data from time slots of a block of time slots not included in said subset of time slots is unsuccessful. 3. The method according to claim 2, additionally containing: a step performed at the base station in which, upon receiving a NACK regarding data transmitted in a time slot from said subset of time slots, retransmitting the data to the user equipment; And a step performed at the user equipment of combining retransmitted data received at the user equipment with data from a buffer corresponding to said time interval, and decoding the combined data. 4. The method of claim 1, wherein said informing comprises, at the base station, transmitting, as part of a subsequent DCI, the time slot identifiers of said subset of time slots or the time slot identifiers of a block of time slots not included in the said subset of time slots . 5. The method of claim 2, wherein said notification comprises the step of transmitting, as part of a subsequent DCI, at the base station, the time slot identifiers of said subset of time slots or the time slot identifiers of a block of time slots not included in the said subset of time slots. . 6. The method of claim 5, further comprising executing on the user device the step of, upon receipt of said subsequent DCI, removing from the buffer data corresponding to time slots not included in said subset of time slots. 7. The method of claim 3, further comprising starting a timer of a predetermined duration at the base station after transmission of the DCI on the PDCCH, and starting a timer of this predetermined duration at the user equipment upon receipt of the DCI, taking into account the propagation time of the signal between the base station and the user device, the method comprising the steps performed on the user device in which, upon expiration of a given predetermined timer duration: defining, as time slots of a block of time slots not included in said subset of time slots, time slots for which NACKs were transmitted from the user equipment to the base station and for which no retransmitted NACKs were received from the base station within said predetermined duration. data, thereby realizing the mentioned information; And remove data from the buffer corresponding to these specific time intervals. 8. The method of claim 3, further comprising starting a separate timer of a predetermined duration at the base station after transmission occurs in each time slot of a block of time slots, and starting a timer of this predetermined duration at the user device upon receiving data in that time slot taking into account the signal propagation time between the base station and the user device, wherein the method comprises the steps performed on the user device in which: upon expiration of a given predetermined timer duration, determine said time slot to be a time slot of a block of time slots not included in said subset of time slots if, for that time slot, a NACK was transmitted from the user equipment to the base station and during the said predetermined duration from the base station has not received the retransmitted data, thereby realizing the above information; And remove data from the buffer corresponding to these specific time intervals. 9. The method according to claim 7 or 8, wherein said predetermined timer duration is set at the base station and communicated, prior to said start, to the user equipment via MAC signaling or RRC signaling. 10. The method according to any one of claims 2 to 9, wherein the base station maintains a plurality of available identifiers that are available for assignment to time slots, wherein, after said reservation, identifiers assigned to the time slots of a block of time slots are excluded from the set of available identifiers; the set of available identifiers is complemented by identifiers for which ACKs from the user device were received at the base station; after the said informing, the set of available identifiers is supplemented with identifiers of time intervals that were not included in the mentioned subset of time intervals. 11. The method according to any one of claims 2 to 10, wherein the user device maintains a plurality of usable identifiers for time intervals, data from which is placed in a buffer, and when said data is placed in a buffer, the plurality of usable identifiers is supplemented with identifiers of time intervals of a block of time slots intervals; identifiers of time intervals corresponding to which data is removed from the buffer are excluded from the set of identifiers used. 12. The method as claimed in any one of the preceding claims, wherein said information to determine the identifiers of all time slots of a block of time slots is an array of time slot identifiers of the block of time slots. 13. The method of any one of the preceding claims, wherein the DCI includes indicating the start of a block of time slots and the end of a block of time slots. 14. The method according to claim 13, wherein the indication of the beginning of a block of time slots is an indication of the starting OFDM symbol of the block of time slots, and the indication of the end of a block of time slots is an indication of the number of time slots in the block of time slots. 15. The method as claimed in any one of the preceding claims, wherein the time slot is a slot containing 12 or 14 OFDM symbols, or a mini-slot containing 2, 4 or 7 OFDM symbols. 16. The method of any one of the preceding claims, wherein the identifier is a HARQ ID. 17. Method of resource allocation in the time domain, performed at a base station (TRP) in a wireless communication system, the method comprising the steps of: selecting a predetermined number of contiguous OFDM symbols for transmission of a physical downlink control channel (PDCCH); selecting a block of time slots containing a set of contiguous time slots, each time slot including a predetermined number of OFDM symbols, and assigning an identifier to each time slot in the block of time slots; allocating, in a block of time slots, a subset of contiguous time slots for transmitting a physical downlink shared channel (PDSCH) to a user equipment (UE); reserving a block of time slots for transmission of a PDSCH to the user equipment by transmitting to the user equipment a PDCCH in which downlink control information (DCI) is carried, including at least information allowing identification of all time slot identifiers of the block of time slots; transmitting the PDSCH to the user equipment in said subset of time slots; And informing the user device about time slots of a block of time slots not included in said subset of time slots by transmitting, as part of a subsequent DCI, time slot identifiers of said subset of time slots or time slot identifiers of a block of time slots not included in said subset of time slots. 18. Base station (TRP) in a wireless communication system, containing at least: transceiver devices; data processing devices; And data storage devices in which computer-executable codes are stored, which, when executed by data processing devices, instruct the base station to: allocate a specified number of contiguous OFDM symbols for transmission of the physical downlink control channel (PDCCH), allocate a block of time slots containing a set of contiguous time slots, each time slot including a predetermined number of OFDM symbols, wherein each time slot in the block of time slots is assigned an identifier, allocate in a block of time slots a subset of contiguous time slots for transmission of a physical downlink shared channel (PDSCH) to a user equipment (UE), reserve a block of time slots for transmission of a PDSCH to a user device by transmitting to the user device, through the transceivers, a PDCCH that carries downlink control information (DCI) including at least information to determine the identifiers of all time slots of the block of time slots intervals, transmit, through the transceivers, the PDSCH to the user device in said subset of time slots and inform the user device about the time slots of a block of timeslots not included in the said subset of time slots by transmitting, through the transceivers, as part of the subsequent DCI, the time slot identifiers of said subset time slots or time slot identifiers of a block of time slots not included in said subset of time slots. 19. A wireless communication system comprising at least a base station (TRP) comprising at least: transceiver devices, data processing devices and data storage devices, wherein the base station is configured to communicate with a user equipment (UE) comprising at least: transceiver devices, data processing devices and data storage devices, wherein computer executable codes are stored in the data storage device of the base station and computer executable codes are stored in the data storage device of the user device, wherein the computer-executable codes, when executed by the base station data processing devices, instruct the base station to: allocate a specified number of contiguous OFDM symbols for transmission of the physical downlink control channel (PDCCH), allocate a block of time slots containing a set of contiguous time slots, each time slot including a predetermined number of OFDM symbols, in this case, each time interval in the block of time intervals is assigned an identifier, allocate in a block of time slots a subset of contiguous time slots for transmission of a physical downlink shared channel (PDSCH) to a user equipment, reserve a block of time slots for transmission of a PDSCH to a user device by transmitting to the user device, through the transceivers, a PDCCH that carries downlink control information (DCI) including at least information to determine the identifiers of all time slots of the block of time slots intervals, start a timer of a predetermined duration at the base station after DCI transmission and transmit, through the transceivers, the PDSCH to the user device in said subset of time slots; wherein the machine-executable codes, when executed by data processing devices of the user device, instruct the user device to: start a timer of said predetermined duration on the user device upon receipt of DCI, taking into account the propagation time of the signal between the base station and the user device, place the received data from the time intervals of the block of time intervals into the buffer and, in relation to each of the time intervals of the block of time intervals, decode the data corresponding to this time interval from the buffer and send a receipt in the physical uplink control channel (PUCCH) through the transceiver devices to the base station, and if decoding is successful, a positive acknowledgment (ACK) is sent as said receipt, and if decoding is unsuccessful, a negative acknowledgment (NACK) is sent as said receipt, and decoding data from time slots of a block of time slots not included in the said subset of time slots is unsuccessful, and data that was transmitted in a time slot from the said subset of time slots and which was acknowledged by means of NACK must be retransmitted from the base station to the user the device, upon expiration of said predetermined timer duration, determine, as the time slots of a block of time slots not included in the said subset of time slots, the time slots for which NACKs were transmitted from the user equipment to the base station and for which during this predetermined duration, no retransmitted data was received from the base station. 20. A wireless communication system comprising at least a base station (TRP) comprising at least: transceiver devices, data processing devices and data storage devices, wherein the base station is configured to communicate with a user equipment (UE) comprising at least: transceiver devices, data processing devices and data storage devices, wherein computer executable codes are stored in the data storage device of the base station and computer executable codes are stored in the data storage device of the user device, wherein the computer-executable codes, when executed by the base station data processing devices, instruct the base station to: allocate a specified number of contiguous OFDM symbols for transmission of the physical downlink control channel (PDCCH), allocate a block of time slots containing a set of contiguous time slots, each time slot including a predetermined number of OFDM symbols, in this case, each time interval in the block of time intervals is assigned an identifier, allocate in a block of time slots a subset of contiguous time slots for transmission of a physical downlink shared channel (PDSCH) to a user equipment, reserve a block of time slots for transmission of a PDSCH to a user device by transmitting to the user device, through the transceivers, a PDCCH that carries downlink control information (DCI) including at least information to determine the identifiers of all time slots of the block of time slots intervals, and transmit, through the transceivers, the PDSCH to the user equipment in said subset of time slots, wherein at the base station, after transmission in each time slot of a block of time slots, a separate timer of a predetermined duration is started; wherein the machine-executable codes, when executed by data processing devices of the user device, instruct the user device to: buffer received data from time slots of a block of time slots, wherein a separate timer of said predetermined duration is started on the user device for receiving data in each time slot of the block of time slots, taking into account the signal propagation time between the base station and the user device, for each of the time slots of the time slot block, decode the data corresponding to this time slot from the buffer and send a receipt to the base station in the physical uplink control channel (PUCCH), and upon successful decoding, a positive acknowledgment (ACK) is sent as the said receipt , and if decoding is unsuccessful, a negative acknowledgment (NACK) is sent as said receipt, and decoding of data from time slots of a block of time slots not included in said subset of time slots is unsuccessful, while data that was transmitted in a time slot from said subset time slots and which have been acknowledged by means of NACK shall be retransmitted from the base station to the user equipment, and upon expiration of said predetermined timer duration, determine the time slot of the time slot block as a time slot not included in the said subset of time slots, if in relation to of this time interval, a NACK was transmitted from the user equipment to the base station and no retransmitted data was received from the base station during this predetermined duration.