CN112187401B

CN112187401B - Multi-time unit transmission method and related device

Info

Publication number: CN112187401B
Application number: CN201910601370.3A
Authority: CN
Inventors: 张长; 丁梦颖; 汪凡
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2019-07-03
Filing date: 2019-07-03
Publication date: 2022-06-14
Anticipated expiration: 2039-07-03
Also published as: WO2021000937A1; CN112187401A

Abstract

The embodiment of the application provides a multi-time unit transmission method and related equipment, wherein the multi-time unit transmission method can send transmission blocks on a plurality of time units; and the size (TBS) of the transport block is larger than a first number of bits and smaller than a second number of bits; the first bit number is the number of bits that can be borne by a first time unit in the plurality of time units; the second bit number is a total bit number that can be carried by the plurality of time units. The method can improve the system throughput to obtain larger receiving gain by repeatedly transmitting the transmission block by a plurality of time units. The size of the transmission block is larger than the first bit number, and the transmission efficiency can be further improved.

Description

Multi-time unit transmission method and related device

Technical Field

The present application relates to the field of communications technologies, and in particular, to a multi-time unit transmission method and a related apparatus.

Background

How to allocate physical resources for transmission in a communication system affects the communication performance of the whole system. Currently, the resource domains mainly available for allocation include time domain, frequency domain, power domain, spatial domain, and the like. The resources of the time domain and the frequency domain are limited, and are difficult to increase by improving hardware specifications and the like. Therefore, the time domain and the frequency domain are two very important resource domains, and how to effectively utilize the time-frequency resource for data transmission to improve the performance, throughput, and the like of the system is a problem to be solved urgently.

Disclosure of Invention

The application provides a multi-time unit transmission method and a related device, which can improve the performance and the throughput of a system.

In a first aspect, an embodiment of the present application discloses a multi-time unit transmission method, which is explained from a sending end. The multi-time cell transmission method is capable of transmitting a transport block over a plurality of time cells. A transport block transmitted by multiple time units occupies multiple time units in the time domain. And, the size (TBS) of the transport block is larger than the first number of bits and smaller than the second number of bits; the first bit number is the number of bits that can be borne by a first time unit in the plurality of time units; the second bit number is a total bit number that can be carried by the plurality of time units. In the multi-time unit transmission, the equivalent code rate (i.e. the ratio of the size of the transmission block to the first number of bits) in the first time unit is greater than 1. Therefore, the transmission block is repeatedly sent by a plurality of time units, so that the equivalent code rate on the time units is improved while a larger receiving gain is obtained, and the data transmission efficiency is improved to a certain extent.

In one possible implementation, the first time unit is one of the plurality of time units.

For example, the network device indicates the first time unit for the terminal from the plurality of time units through signaling (e.g., physical layer information, RRC layer signaling, MAC CE, system message, or broadcast message).

For example, the first time unit is a first, second, last or other time unit of the plurality of time units.

For example, the first time unit is a time unit with the least or the most number of REs in the plurality of time units. The number of REs in a time unit refers to the number of RE resources allocated by the network device for the terminal to transmit the data channel in the time unit, or the number of RE resources actually available for the terminal to transmit the data channel allocated by the network device for the terminal in the time unit, or the number of all RE resources allocated by the network device for the terminal in the time unit.

In one possible implementation, the first time unit is any one of the plurality of time units.

In one possible implementation, a ratio between the size of the TB and the first number of bits is greater than a first value, the first value being greater than 1. Optionally, the first value is 1.25, 1.33 or 1.5. This implementation is advantageous for improving the transmission efficiency of data.

In one possible implementation, a ratio between the TBS and the second number of bits is greater than a second value and less than or equal to 1, and the second value is less than 1. Optionally, the second value is 0.23, 0.2, 0.15 or 0.1. The implementation method improves the data transmission rate in one time unit, and simultaneously avoids the TBS from being too large and exceeding the bearing capacity of a plurality of time units.

In one possible implementation, the first number of bits is determined based on the number of resource elements in the first time unit and a modulation order of the first time unit. The number of resource elements in the first time unit may be the total number of resource elements configured for the multi-time unit transmission in the first time unit, or the total number of resource elements configured to be capable of transmitting data. In one possible implementation, the transmitting the transport block over the plurality of time units includes: the transport block is transmitted in a frequency domain unit for each of a plurality of time units.

Optionally, the number of the frequency domain units of each time unit is multiple. Therefore, the method is beneficial to further improving the transmission efficiency in the transmission aiming at the medium and high rate services.

For example, the physical time-frequency resources occupied by multi-time unit transmission occupy multiple time units in the time domain and multiple frequency-domain units in the frequency domain. The frequency domain unit may be a Resource Block (RB), a Resource Block Group (RBG), or a subcarrier. For example, the physical time-frequency resource occupied by multi-time unit transmission is a plurality of RBs, a plurality of RBGs, or a plurality of subcarriers in the frequency domain.

In summary, the multi-time unit transmission method of the present application can repeatedly send the same transmission block in multiple time units, thereby increasing the receiving gain and improving the performance; on the other hand, the size of the transport block is larger than the number of bits carried in the first time unit, so that the transmission efficiency of data can be improved.

For a plurality of time units of the physical time-frequency resource occupied by multi-time unit transmission on the time domain, the transmission on each time unit corresponds to one initial transmission or retransmission of the same transmission block; alternatively, the transmission on each time unit corresponds to one initial transmission or retransmission of the same multiple transport blocks.

In one possible implementation, transmitting a transport block over a plurality of time units includes: and for one time unit in a plurality of time units, performing rate matching on the transmission block sent in the time unit according to the RV corresponding to the time unit, and sending the transmission block subjected to the rate matching in the time unit, wherein the candidate RV comprises the RV corresponding to the time unit.

In one possible implementation, the RV corresponding to the time unit is included in the candidate RVs. That is, the candidate RVs include the RV corresponding to the one time unit. One or more RVs are included in the candidate RVs.

The embodiment of the application also provides a method for determining the redundancy version aiming at the multi-time unit transmission method. The redundancy version determination method can determine the number of RV candidates based on the ratio between the TBS and the first bit number. The ratio between the TBS transmitted in the multi-time unit and the first bit number may also be referred to as an equivalent code rate in the first time unit. I.e., the number of candidate RVs transmitted by a multi-time unit is related to the equivalent code rate over the first time unit.

Optionally, the redundancy version determination method may further determine the number and the positions of the candidate RVs based on the equivalent code rate in the first time unit.

Alternatively, the positions of the candidate RVs may be positions where the number of candidate RVs are uniformly or non-uniformly distributed in the ring buffer.

In addition, an embodiment of the present application further provides a method for determining a size of a transport block, where the method may be implemented by a sending end or a receiving end, and the embodiment of the present application is not limited. In the method for determining the size of the transmission block, physical time-frequency resources occupied by multi-time unit transmission are determined according to time domain resource information and frequency domain resource information; determining the total number of REs occupied by the multi-time unit transmission based on a plurality of time units of the physical time-frequency resource in a time domain and a plurality of frequency units in a frequency domain; the transport block size transmitted over a multiple time unit is determined according to the product between the total number of REs, the modulation order and the coding rate. For example, the product is taken as the transport block size of a multi-time unit transmission.

The total number of REs may be the number of all RE resources on the physical time-frequency resource, or the number of RE resources on the physical time-frequency resource that can be used for bearing an uplink data channel or a downlink data channel, or the number of RE resources on the physical time-frequency resource that are used for transmitting a data channel of a terminal. The modulation order and the coding rate are indicated by modulation coding information in the downlink control information.

The time domain Resource information and the frequency domain Resource information may be configured by the network device in one or a combination of Radio Resource Control (RRC) signaling, downlink Control signaling, and Media Access Control (MAC-CE) signaling. Thereby the terminal obtains the physical time-frequency resource occupied by multi-time unit transmission.

Optionally, the size of the transport block for multi-time unit transmission is determined according to the product between the total number of REs and the equivalent spectral efficiency. The product between the total number of REs and the equivalent spectral efficiency can be calculated as the transport block size for the multi-time unit transmission. The equivalent spectral efficiency is the number of bits of the original data before encoding, which is averagely carried on each RE in the physical time-frequency resource.

In another possible implementation, the obtained product may be subjected to a numerical rounding-down operation or a numerical rounding-up operation in combination with a TBS table predefined by the protocol, so as to obtain the transport block size transmitted by multiple time units. Wherein the predefined table comprises a plurality of numerical values. Rounding down the product refers to selecting the largest value from a plurality of values smaller than the product based on a predefined table. Performing a value approximation operation on the product refers to selecting a maximum value from one or more values that are approximated to the product based on a predefined table. For example, a distance (e.g., an absolute value of a difference) between the one or more numerical values and the product is less than or equal to a first threshold. The first threshold may be 1, 2, 2.3, 3, 4.5 or other possible values, without limitation.

In yet another possible implementation, determining a transport block size for multi-time unit transmission according to the time domain resource information, the frequency domain resource information, and the modulation coding information includes: determining the number of REs in a second time unit or the number of REs carrying a data channel in the plurality of time units according to the time domain resource information and the frequency domain resource information; the transport block size transmitted over the multiple time cells is determined based on the second product. The second product is a product between the first product and a number of time units in the plurality of time units. The first product is a product of the number of REs in the second time unit, the modulation order in the second time unit, and the coding rate in the second time unit. Alternatively, the product between the number of REs and the equivalent spectral efficiency may be calculated as the first product. The equivalent spectral efficiency is the number of bits of the original data before encoding, which is averagely carried on each RE in the physical time-frequency resource.

In one possible implementation, the second time unit is one of the plurality of time units.

For example, the network device indicates the second time unit for the terminal from the plurality of time units through signaling (such as physical layer information, RRC layer signaling, MAC CE, system message, or broadcast message).

For example, the second time unit is the first, second, last, or other time unit of the plurality of time units.

For example, the second time unit is a time unit with the least or the most number of REs in the plurality of time units. The number of REs in a time unit is the number of RE resources allocated by the network device for the terminal in the time unit to transmit the data channel, or the number of RE resources actually available for the terminal to transmit the data channel allocated by the network device for the terminal in the time unit, or the number of all RE resources allocated by the network device for the terminal in the time unit. In one possible implementation, the second time unit is any one of the plurality of time units.

The first time unit and the second time unit may be the same time unit or different time units, which is not limited in the embodiment of the present application.

Optionally, based on a TBS table predefined by a protocol, a numerical rounding-down operation or a numerical rounding-up operation may be performed on the second product to obtain a transport block size for multi-time unit transmission.

In a second aspect, an embodiment of the present application further provides a multi-time unit transmission method, which is described in the following.

For example, in downlink data transmission, the network device executes the relevant method of the first aspect to send a transport block in multiple time units, and accordingly, the terminal may receive the transport block in multiple time units; a size (TBS) of the transport block is greater than a first number of bits and less than a second number of bits; the first bit number is the number of bits that can be borne by a first time unit in the plurality of time units; the second bit number is a total bit number that can be carried by the plurality of time units.

For example, in uplink data transmission, the terminal device executes the method related to the first aspect to send a transport block in multiple time units, and accordingly, the network device may receive the transport block in multiple time units; a size (TBS) of the transport block is greater than a first number of bits and less than a second number of bits; the first bit number is the number of bits that can be borne by a first time unit in the plurality of time units; the second bit number is a total bit number that can be carried by the plurality of time units.

For the description of the first time unit, the first number of bits, the second number of bits, the determination method of the TBS, and the like, reference may be made to the first aspect, which is not described herein again.

In one possible implementation, the receiving the transport block over the plurality of time units includes: the transport block is received in a frequency domain unit for each of a plurality of time units.

In an alternative design, the number of frequency domain units of each time unit is multiple.

In one possible implementation, the receiving the transport block over the plurality of time units includes: for one time unit in a plurality of time units, receiving a transmission block subjected to rate matching on the time unit according to the RV corresponding to the time unit; wherein, the candidate RV comprises the RV corresponding to the time unit.

In one possible implementation, the RV corresponding to the time unit is included in the candidate RVs. One or more RVs are included in the candidate RVs.

In one possible implementation, the number of candidate RVs is determined based on a ratio between the TBS and the first number of bits.

In one possible implementation, the location of the RV candidate is determined based on a ratio between the TBS and the first number of bits.

In particular, in the second aspect, the relevant contents of the embodiments can be referred to the above first aspect, and are not described in detail here.

In a third aspect, the present application further provides a sending apparatus, where the sending apparatus may be a network device, may also be an apparatus in a network device, or may be an apparatus capable of being used in cooperation with a network device. Alternatively, the transmitting device may be a terminal device, a device in the terminal device, or a device that can be used in cooperation with the terminal device. In one design, the apparatus may include a module corresponding to one or more of the methods/operations/steps/actions described in the first aspect, where the module may be implemented by hardware circuit, software, or a combination of hardware circuit and software. In one design, the apparatus may include a communication module. In an exemplary manner, the first and second electrodes are,

a communication module for transmitting transport blocks over a plurality of time units; a size (TBS) of the transport block is greater than a first number of bits and less than a second number of bits; the first bit number is the number of bits that can be borne by a first time unit in the plurality of time units; the second bit number is a total bit number that can be carried by the plurality of time units.

In a possible design, the first time unit, the first number of bits, the method for determining the second number of bits TBS, the method for the communication module to transmit the transport block over multiple time units, and the like may be referred to the corresponding description in the first aspect, and are not specifically limited herein.

In a fourth aspect, the present application further provides a receiving apparatus, where the receiving apparatus may be a terminal, an apparatus in the terminal, or an apparatus capable of being used in cooperation with the terminal; alternatively, the receiving apparatus may be a network device, an apparatus in a network device, or an apparatus capable of being used with a terminal network device. In one design, the apparatus may include a module corresponding to one or more of the methods/operations/steps/actions described in the second aspect, where the module may be implemented by hardware circuit, software, or a combination of hardware circuit and software. In one design, the apparatus may include a communication module. In an exemplary manner, the first and second electrodes are,

a communication module for receiving transport blocks over a plurality of time units; a size (TBS) of the transport block is greater than a first number of bits and less than a second number of bits; the first bit number is the number of bits that can be borne by a first time unit in the plurality of time units; the second bit number is a total bit number that can be carried by the plurality of time units.

In a possible design, the first time unit, the first number of bits, the second number of bits, and the method for receiving the transport block over a plurality of time units, the method for determining the TBS, etc. may be referred to the corresponding description in the second aspect, and are not limited in detail here.

In a fifth aspect, an embodiment of the present application provides a transmitting apparatus, where the apparatus includes one or more processors, and is configured to implement the method described in the first aspect. The apparatus may also include a memory to store instructions and data. The memory is coupled to the one or more processors, which when executing instructions stored in the memory, may implement the method described in the first aspect above. The apparatus may also include a communication interface for the apparatus to communicate with other devices, which may be, for example, a transceiver, circuit, bus, module, or other type of communication interface. In one possible arrangement, the transmitting means comprises:

a memory for storing program instructions;

one or more processors configured to transmit, using a communication interface, a transport block over a plurality of time units; a size (TBS) of the transport block is greater than a first number of bits and less than a second number of bits; the first bit number is the number of bits that can be borne by a first time unit in the plurality of time units; the second bit number is a total bit number that can be carried by the plurality of time units.

In a possible design, the first time unit, the first number of bits, the second number of bits, and the method for transmitting the transport block over the multiple time units, the method for determining the TBS, etc. may be referred to the corresponding description in the first aspect, and are not specifically limited herein.

In a sixth aspect, an embodiment of the present application provides a receiving apparatus, where the apparatus includes one or more processors, and is configured to implement the method described in the second aspect. The apparatus may also include a memory to store instructions and data. The memory is coupled to the one or more processors, which when executing instructions stored in the memory, may implement the method described in the second aspect above. The apparatus may also include a communication interface for the apparatus to communicate with other devices, which may be, for example, a transceiver, circuit, bus, module, or other type of communication interface. In one possible arrangement, the receiving means comprises:

a memory for storing program instructions;

one or more processors configured to receive, using a communication interface, a transport block over a plurality of time units; a size (TBS) of the transport block is greater than a first number of bits and less than a second number of bits; the first bit number is the number of bits that can be borne by a first time unit in the plurality of time units; the second number of bits is a total number of bits that can be carried by the plurality of time units.

In one possible design, the first time unit, the first number of bits, the second number of bits, the determination method of the TBS, and the method for receiving the transport block over multiple time units may be referred to the corresponding description in the second aspect, and are not specifically limited herein.

In a seventh aspect, this embodiment also provides a computer-readable storage medium, which includes instructions that, when executed on a computer, cause the computer to perform the method of the first aspect.

In an eighth aspect, an embodiment of the present application further provides a computer-readable storage medium, which includes instructions that, when executed on a computer, cause the computer to perform the method of the second aspect.

In a ninth aspect, an embodiment of the present application provides a chip system, where the chip system includes one or more processors and may further include a memory, and is configured to implement the method in the first aspect. The chip system may be formed by a chip, and may also include a chip and other discrete devices.

In a tenth aspect, an embodiment of the present application provides a chip system, where the chip system includes a processor and may further include a memory, and is configured to implement the method according to the second aspect. The chip system may be formed by a chip, and may also include a chip and other discrete devices.

In an eleventh aspect, an embodiment of the present application provides a system, where the system includes the transmitting apparatus in the third aspect or the fifth aspect, and the receiving apparatus in the fourth aspect or the sixth aspect.

Drawings

FIG. 1 is a schematic structural diagram of a vehicle networking communication system provided in an embodiment of the present application;

fig. 2 is a schematic diagram of a wireless communication system according to an embodiment of the present application;

FIG. 3 is an exemplary diagram of a resource grid provided by an embodiment of the present application;

fig. 4 is a diagram illustrating exemplary RV candidates on a ring buffer according to an embodiment of the present application;

fig. 5 is a flowchart illustrating a multi-time unit transmission method according to an embodiment of the present application;

fig. 6 is a schematic flowchart of another multi-time-unit transmission method according to an embodiment of the present application;

fig. 7a is an exemplary diagram of candidate RVs on a circular buffer provided by an embodiment of the present application;

fig. 7b is a diagram of another example of candidate RVs on a ring buffer according to an embodiment of the present application;

FIG. 8 is a diagram illustrating an example of a multi-time cell transmission according to an embodiment of the present application;

fig. 9 is an exemplary diagram of another wireless communication system provided by an embodiment of the present application;

fig. 10 is a schematic structural diagram of an apparatus according to an embodiment of the present disclosure.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

The technical scheme of the application can be specifically applied to various communication systems, such as: global system for mobile communications (GSM), Code Division Multiple Access (CDMA), Wideband Code Division Multiple Access (WCDMA), time division-synchronous code division multiple access (TD-SCDMA), Universal Mobile Telecommunications System (UMTS), Long Term Evolution (LTE) system, etc. With the continuous development of communication technology, the technical solution of the embodiments of the present application may also be used in future networks, such as a fifth generation (5G) system, or may be used in a device to device (D2D) system, a machine to machine (M2M) system, and so on. Among them, the 5G system may also be called a New Radio (NR) system.

Under the LTE system proposed by the 3rd generation partnership project (3 GPP), a vehicle to any thing communication (V2X) technology (X stands for anything) is proposed. The communication method in the V2X system is collectively referred to as V2X communication. For example, the V2X communication includes: communication between a vehicle and a vehicle (V2V), communication between a vehicle and a roadside infrastructure (V2I), communication between a vehicle and a pedestrian (V2P), or communication between a vehicle and a network (V2N), and the like. Communications between terminals involved in the V2X system may be broadly referred to as Side Link (SL) communications. The technical scheme of the embodiment of the application can also be applied to the Internet of vehicles, namely, the terminal can also be a vehicle or a vehicle component applied to the vehicle. Optionally, the technical solution of the embodiment of the present application may also be applied to a scenario of internet of things (IoT) or a Machine Type Communication (MTC) scenario, that is, the terminal described in the embodiment of the present application may also be a terminal in a large-scale connection scenario.

At present, vehicles or vehicle components can obtain road condition information or receive service information in time through V2V, V2I, V2P or V2N communication modes, which may be collectively referred to as V2X communication. The V2X communication is a basic technology and a key technology applied in a scene with a very high requirement on communication delay in the future, such as intelligent automobiles, automatic driving, intelligent transportation systems, and the like, for high-speed devices represented by vehicles. Fig. 1 is a schematic diagram of a prior art V2X system. The schematic includes V2V communication, V2P communication, and V2I/N communication.

As shown in fig. 1, the vehicles or vehicle components communicate with each other via V2V. The vehicle or the vehicle component can broadcast information such as the speed, the running direction, the specific position, whether the emergency brake is stepped on and the like of the vehicle or the vehicle component to surrounding vehicles, and drivers of the surrounding vehicles can better sense traffic conditions outside the sight distance by acquiring the information, so that the dangerous conditions are pre-judged in advance and avoided; the vehicle or vehicle component communicates with a roadside infrastructure, which may provide the vehicle or vehicle component with access to various service information and data networks, via V2I. The functions of electronic toll collection, in-vehicle entertainment and the like greatly improve the traffic intelligence. Roadside infrastructure, for example, roadside units (RSUs) include two types: one is a terminal type RSU. Since the RSU is distributed on the roadside, the RSU of the terminal type is in a non-mobile state, and the mobility does not need to be considered; the other is a RSU of network device type. The RSU of this network device type may provide timing synchronization and resource scheduling to the vehicle or vehicle component in communication with the network device. The vehicle or vehicle component communicates with the person via V2P; the vehicle or vehicle components communicate with the network through V2N, and V2N may be collectively referred to as V2I/N with V2I described above.

The network architecture and the service scenario described in the embodiment of the present application are for more clearly illustrating the technical solution of the embodiment of the present application, and do not form a limitation on the technical solution provided in the embodiment of the present application, and as a person of ordinary skill in the art knows that along with the evolution of the network architecture and the appearance of a new service scenario, the technical solution provided in the embodiment of the present application is also applicable to similar technical problems.

The terminal related to the embodiment of the application can also be called a terminal, and can be a device with a wireless transceiving function, which can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; can also be deployed on the water surface (such as a ship and the like); and may also be deployed in the air (e.g., airplanes, balloons, satellites, etc.). The terminal may be a User Equipment (UE), wherein the UE includes a handheld device, a vehicle-mounted device, a wearable device, or a computing device having wireless communication functionality. Illustratively, the UE may be a mobile phone (mobile phone), a tablet computer, or a computer with wireless transceiving function. The terminal may also be a Virtual Reality (VR) terminal, an Augmented Reality (AR) terminal, a wireless terminal in industrial control, a wireless terminal in unmanned driving, a wireless terminal in telemedicine, a wireless terminal in smart grid, a wireless terminal in smart city (smart city), a wireless terminal in smart home (smart home), and so on. In the embodiment of the present application, the apparatus for implementing the function of the terminal may be a terminal; it may also be a device, such as a system-on-chip, capable of supporting the terminal to implement the function, which may be installed in the terminal. In the embodiment of the present application, the chip system may be formed by a chip, and may also include a chip and other discrete devices. In the technical solution provided in the embodiment of the present application, a device for implementing a function of a terminal is taken as an example, and the technical solution provided in the embodiment of the present application is described.

The network device related to the embodiment of the present application includes a Base Station (BS), which may be a device deployed in a radio access network and capable of performing wireless communication with a terminal. The base station may have various forms, such as a macro base station, a micro base station, a relay station, an access point, and the like. For example, the base station related to the embodiment of the present application may be a base station in 5G or a base station in LTE, where the base station in 5G may also be referred to as a Transmission Reception Point (TRP) or a gNB. In the embodiment of the present application, the apparatus for implementing the function of the network device may be a network device; or may be a device, such as a system-on-chip, capable of supporting the network device to implement the function, and the device may be installed in the network device. In the technical solution provided in the embodiment of the present application, a device for implementing a function of a network device is taken as an example of a network device, and the technical solution provided in the embodiment of the present application is described.

In this embodiment, a part of the scenarios in the present application is described by taking a scenario of an NR network in a wireless communication network as an example, it should be noted that the scheme in the embodiment of the present application may also be applied to other wireless communication networks, and corresponding names may also be replaced by names of corresponding functions in other wireless communication networks.

In the following, various aspects, embodiments or features of the present application will be presented in the context of a system comprising a plurality of devices, components, modules, and the like. It is to be understood that the various systems may include additional devices, components, modules, etc. and/or may not include all of the devices, components, modules etc. discussed in connection with the figures. Furthermore, a combination of these schemes may also be used.

In addition, in the embodiments of the present application, the word "exemplary" is used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, the word using examples is intended to present concepts in a concrete fashion.

In the embodiments of the present application, at least one may also be described as one or more, and a plurality may be two, three, four or more, which is not limited in the present application. In the embodiment of the present application, for a technical feature, the technical features in the technical feature are distinguished by "first", "second", "third", "a", "B", "C", and "D", and the like, and the technical features described in "first", "second", "third", "a", "B", "C", and "D" are not in a sequential order or a size order.

Fig. 2 is a schematic diagram illustrating a wireless communication system according to an embodiment of the present application. As shown in fig. 2, the wireless communication system may include: one or more network devices 101, one or more terminals 103. The wireless communication system may also include a core network 115. Wherein: the network device 101 may communicate with the terminal 103 through a wireless interface 105. In some embodiments, the network device 101 communicates with the terminal 103 under the control of a network device controller (not shown), which may be part of the core network 115 or integrated into the network device 101. For example, the network device 101 may be configured to transmit control information or user data to the core network 115 via a backhaul interface 113 (e.g., an S1 interface). Specifically, the network device 101 and the network device 101 may also communicate with each other directly or indirectly through a backhaul interface 111 (e.g., an X2 interface). In addition, multiple network devices may schedule the same terminal, for example, multiple network devices schedule the same terminal to receive multiple copies of data, so as to improve throughput of the user; conversely, the terminal may also send data to multiple network devices, so that the multiple network devices merge the received data.

The embodiment of the application provides a multi-time unit transmission method. In the transmission method, the network device may repeatedly transmit one transport block over a plurality of time units, and the terminal may repeatedly receive the transport block over the plurality of time units. The size of the transmission block is greater than a first bit number and less than a second bit number, the first bit number is a bit number that can be carried by a first time unit in the plurality of time units, and the second bit number is a total bit number that can be carried by the plurality of time units.

Illustratively, the network device repeatedly transmits one transport block over P1 time units, P1 being an integer greater than 1. The terminal may repeatedly receive the transport block in P1 time units, or may receive the transport block in a part of the P1 time units (e.g., P2 time units, where P2 is less than P1 and is greater than or equal to 1). Illustratively, the terminal device receives the transport block in P2 time units of the P1 time units, and after the transport block is decoded correctly, the terminal may not receive the transport block again in the remaining P1-P2 time units.

For ease of understanding, the relevant terms referred to herein will be briefly described below.

1. Multiple time cell transmission

Herein, multi-time unit transmission may also be referred to as cross-time unit transmission, repeated transmission of the same transport block over multiple time units, transmission time interval bundling (TTI bundling), slot aggregation (slot aggregation), or the like. This document describes multi-time cell transmission.

Herein, the physical time-frequency resource occupied by the multi-time unit transmission includes a plurality of subcarriers in the frequency domain, a frequency band greater than 180kHz, a plurality of Resource Blocks (RBs), or a plurality of Resource Block Groups (RBGs), and a plurality of time units in the time domain.

For one transport block, multi-time unit transmission refers to that each Redundancy Version (RV) of one transport block is transmitted over a plurality of time units, respectively. The redundancy versions corresponding to any two different time units may be the same or different. Or, in the multi-time unit transmission, the transmission in each time unit is the primary transmission or the retransmission of the same transmission block.

Correspondingly, for a plurality of transport blocks, the multi-time unit transmission means that the redundancy versions of the transport blocks are transmitted over a plurality of time units respectively. The redundancy versions corresponding to any two different time units may be the same or different. Or, in the multi-time unit transmission, the transmission in each time unit is the primary transmission or the retransmission of the multiple transmission blocks respectively.

The embodiments of the present application are described with reference to one transport block as an example, and the methods provided in the embodiments of the present application may be used for a multi-time unit transmission scheme of multiple transport blocks.

In addition, the multi-time unit transmission described in the embodiment of the present application may be applied to uplink data transmission, and may also be applied to downlink data transmission. The transport block may be carried in a Physical Downlink Shared Channel (PDSCH) and transmitted from the network device to the terminal, or carried in a Physical Uplink Shared Channel (PUSCH) and transmitted from the terminal to the network device.

Any two time units in the plurality of time units can be index numbers or time units with continuous marks, or index numbers or time units with discontinuous marks.

In this embodiment, the network device may configure the physical time-frequency resource occupied by multi-time unit transmission for the terminal in one or more of a static, semi-static, or dynamic manner.

For example, the network device is configured by combining one or more of system message, broadcast message, Radio Resource Control (RRC) signaling, downlink control signaling, and medium access control element (MAC-CE) signaling. Thereby the terminal obtains the physical time-frequency resource occupied by multi-time unit transmission.

For example, when the terminal is configured in a semi-static manner to indicate, the network device indicates, to the terminal, the plurality of time units occupied by the multi-time unit transmission through the parameter. For another example, an optional set of time units occupied by multi-time unit transmission is configured through RRC signaling; and indicating one set adopted by multi-time unit transmission in the DCI; therefore, the terminal determines the set of time units adopted by multi-time unit transmission according to the indication in the DCI and the optional set of RRC signaling configuration.

2. Time cell

A time unit may be one or more radio frames, one or more subframes, one or more slots, one or more minislots (mini slots), one or more Orthogonal Frequency Division Multiplexing (OFDM) symbols, discrete fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM) symbols, etc., or may be a time window consisting of a plurality of frames or subframes, such as a System Information (SI) window. For example, the time domain resource occupied by one transmission of a transport block is one or more OFDM symbols, or one or more DFT-S-OFDM symbols, or one or more minislots. Wherein one micro slot may include a plurality of OFDM symbols or DFT-S-OFDM symbols.

A wireless communication system may support one or more frame structures that differ in one or more of subcarrier spacing, Cyclic Prefix (CP) type, and time unit length. Illustratively, when the subcarrier spacing and/or CP type of two frame structures are different, the symbol lengths included in their respective frame structures may also be different. One subframe may contain one or more slots; one slot may include an integer number of symbols, e.g., 7, 14, 6, or 12 OFDM symbols. Among them, the CP type includes a Normal Cyclic Prefix (NCP) and an Extended Cyclic Prefix (ECP).

In one example, the number of slots included in a subframe may be related to the subcarrier spacing supported by the wireless communication system. For a wireless communication system supporting a plurality of subcarrier spacings, one slot is included in one subframe when the subcarrier spacing is 15 kilohertz (kHz); when the subcarrier spacing is 30Kilohertz (kHz), a subframe includes four slots. For example, for normal or Normal Cyclic Prefix (NCP), the subcarrier spacing is 15kHz by 2^μIn kHz, the number of OFDM symbols contained in one time slot

Number of time slots contained in one frame

And the number of slots contained in a subframe

As shown in table 1. Wherein μ is an integer greater than or equal to 0.

TABLE 1

As another example, for Extended Cyclic Prefix (ECP), when the subcarrier spacing is 15kHz by 2^μIn kHz, the number of OFDM symbols contained in one time slot

Number of time slots contained in one frame

And the number of slots contained in a subframe

As shown in table 2. Wherein μ is an integer greater than or equal to 0.

TABLE 2

3. Resource elements

A Resource Element (RE) is a resource unit used for data transmission or a resource unit used for resource mapping of data to be transmitted. Fig. 3 is a diagram illustrating an example of a resource grid according to an embodiment of the present application. As shown in fig. 3, one RE corresponds to one symbol in the time domain, for example, an OFDM symbol or DFT-s-OFDM symbol as described above; one RE corresponds to one subcarrier in the frequency domain.

Resource Blocks (RBs) may also be defined in the resource grid. In one example, one RB is in the frequency domain and includes a positive integer number of subcarriers, such as 12. In another example, one RB may include a positive integer number of subcarriers in the frequency domain and a positive integer number of symbols in the time domain. For example, as shown in fig. 3, one RB includes 12 subcarriers in the frequency domain and 7 symbols in the time domain.

In the resource grid, slots (slots) may also be defined. A slot may include a positive integer number of symbols, e.g., 7, 14, 6, or 12. A positive integer number of slots may be included in one subframe. For example, when the subcarrier spacing is 15kHz, one subframe includes one slot, as shown in fig. 3. When the subcarrier spacing is 30kHz, one subframe includes 2 slots. When the subcarrier spacing is 60kHz, one subframe includes 4 slots.

4. First number of bits and second number of bits

In the embodiment of the application, the first bit number is a bit number that can be borne by the first time unit in the time domain in the physical time-frequency resource occupied by the multi-time unit transmission.

For example, the network device indicates the first time unit for the terminal from the plurality of times through signaling (e.g., a method of one or more combinations of physical layer information, RRC layer signaling, MAC CE, system message, or broadcast message).

For example, the first time unit is the first, second, last or other time unit of the plurality of time units.

For example, the first time unit is a time unit with the least or the most number of REs in the plurality of time units. The number of REs in one time unit is the number of RE resources allocated by the network device for transmitting the data channel to the terminal, or the number of RE resources actually available for transmitting the data channel to the terminal allocated by the network device to the terminal, or the number of all RE resources allocated by the network device to the terminal.

The first number of bits is determined based on the number of resource elements in the first time unit and a modulation order of the first time unit. For example, the first number of bits is a product between the number of resource elements in the first time unit and a modulation order of the first time unit.

The modulation order of the first time unit is the modulation order indicated by the modulation coding information corresponding to the transmission of the first time unit. The modulation orders of each time unit in the multi-time unit transmission may be the same or different.

The number of resource elements in the first time unit may be the number of resource elements allocated to the physical time-frequency resource in the first time unit. Or, the number of resource elements in the first time unit is the number of resource elements which are allocated in the time unit and can be used for data transmission (for example, can be used for transmitting PDSCH or PUSCH) in the physical time-frequency resources occupied by multi-time unit transmission.

In the physical time-frequency resources occupied by multi-time-unit transmission, most resource elements allocated to the terminal by the network equipment in one time unit can be used for data transmission, except some resource elements with specific purposes. E.g., resource elements used to carry demodulation reference signals.

In this embodiment, the second bit number is a total bit number that can be borne by a plurality of time units in a time domain in a physical time-frequency resource occupied by multi-time unit transmission. Namely, the sum of the number of bits that can be carried in each of the plurality of time units is used as the second number of bits.

For example, the product of the number of time units in the time domain and the first number of bits in the physical time-frequency resource occupied by the multi-time-unit transmission is used as the second number of bits.

For another example, a product between the total number of resource elements RE in the physical time-frequency resource occupied by the multi-time unit transmission and the modulation order of the multi-time unit transmission is calculated, and the product is used as the second bit number. Correspondingly, the total number of REs may be the number of all RE resources on the physical time-frequency resource, or the number of RE resources used for carrying uplink data or downlink data on the physical time-frequency resource, or the number of RE resources used for transmitting a data channel of the terminal on the physical time-frequency resource.

5. Transmission block

A transmission block size (TB) is a processing unit of data. The size (TBS) of one transport block or the total number of bits of one transport block is determined according to resource allocation information and modulation coding information in the scheduling information.

In one example, the terminal may determine the size of the transport block by looking up the TBS table based on the physical time-frequency resource (e.g., the number of REs) indicated by the resource allocation information sent by the network device and the modulation and coding scheme indicated by the modulation and coding information.

In another example, the transport block size, TBS, is determined according to the physical time-frequency resource indicated by the resource allocation information, the modulation order indicated by the modulation coding information, and the coding rate indicated by the modulation coding information.

In this embodiment of the present application, in multi-time unit transmission, the TBS may be determined by the total number of REs of physical time-frequency resources occupied by multi-time unit transmission, a modulation order indicated by modulation coding information, and a coding rate indicated by the modulation coding information.

The total number of REs of the physical time-frequency resources occupied by the multi-time-unit transmission is the number of all RE resources on the physical time-frequency resources, or the number of RE resources used for carrying uplink data or downlink data on the physical time-frequency resources, or the number of RE resources used for carrying data channels of the terminal on the physical time-frequency resources.

Wherein, the coding rate is the ratio of the bit number of the original data to the bit number transmitted in the actual transmission process. The number of original bits may also be referred to as the number of active bits or the number of bits of the original data. The original data may be data obtained after data in the transmission block is subjected to certain processing. For example, the original bit number may be data obtained after performing Cyclic Redundancy Check (CRC) on data in the transport block.

6. Redundancy version

A Redundancy Version (RV) is used for a portion of data selected from the circular buffer to map the selected data onto a time unit. Optionally, a part of data is selected from the ring buffer with a certain RV as a starting point, and after a series of processing is performed on the part of data, the processed data is mapped to a time unit. The series of processes may include scrambling, layer mapping, precoding, and the like, among others. The process of selecting data from the circular buffer may also be referred to as rate matching.

Before original data obtained based on a transmission block is placed in an annular buffer, a mother code is needed to be adopted to encode the original data, and the encoded data is stored in the annular buffer. The mother code may refer to a coding rate used when encoding the original data to be placed in the circular buffer. The mother code is different from the code rate indicated by the modulation code information.

For example, if the original data is encoded with a mother code of 3, the encoded data is three times that of the original data; after the encoded data is stored in the circular buffer, a plurality of RVs may be set in a discrete distribution (e.g., a uniform distribution or other non-uniform distribution), where each RV corresponds to a starting point of the selected data.

For example, as shown in fig. 4, there are four candidate RV positions in the ring buffer, RV0, RV1, RV2, and RV 3; the transmitting end may select one RV from the four candidate RV positions as a starting point of data fetching for each time unit to be mapped, and sequentially select coded bit data of a certain length from the circular buffer to map the bit data to the time unit.

In the embodiment of the present application, in multi-time unit transmission, the RV corresponding to each time unit may be dynamically indicated or preconfigured. For example, the terminal receives downlink control information, where the downlink control information is used to indicate an RV corresponding to each time unit. Wherein, RV corresponding to different time units may be the same or different. When the channel condition is not good, the RV corresponding to different time units is the same, and the reception gain can be improved to a certain extent.

In this embodiment, the number of candidate RVs in the circular buffer, and/or the position of the candidate RVs may be determined based on a ratio between the TBS and the first number of bits.

The multi-time cell transmission method described in the present application is described below with reference to the drawings and the above terms.

Referring to fig. 5, fig. 5 is a schematic flowchart of a multi-time unit transmission method according to an embodiment of the present application, where the transmission method is described with the transmitting end and the receiving end in fig. 2 as an execution main body, where the multi-time unit transmission method shown in fig. 5 is applied to uplink data transmission, where the transmitting end is a terminal and the receiving end is a network device; when the multi-time unit transmission method is applied to downlink data transmission, a sending end is a network device, and a receiving end is a terminal. As shown in fig. 5, the multi-time cell transmission method may include the steps of:

101. a transmitting end transmits a transmission block on a plurality of time units; the receiving end receives the transport blocks over the plurality of time units.

In an optional implementation manner, the sending end sending the transport block over multiple time units may include: the sending end sends the redundancy versions corresponding to the time units of the same transmission block on a plurality of time units respectively. The redundancy versions corresponding to any 2 different time units may be the same or different.

Accordingly, the receiving end receiving the transport block over the plurality of time units may include: the receiving end receives the redundancy versions corresponding to the time units of the same transmission block on a plurality of time units respectively. And then, the receiving end can utilize the transmission blocks of the redundancy versions to carry out joint decoding and feed back the HARQ-ACK information transmitted by the multi-time unit to the transmitting end.

The size of the transmission block is larger than a first bit number and smaller than a second bit number; the first bit number is the number of bits that can be borne by a first time unit in the plurality of time units; the second bit number is the total bit number capable of being carried in the plurality of time units. Specifically, as in the introductory part of the terminology, the correlation between the first number of bits and the second number of bits is explained.

Therefore, in the embodiment of the application, the same transmission block is transmitted by multiple time units, so that the situation that the bandwidth is increased to a certain degree or the channel state is poor is avoided, and the problem that the improvement effect of the increase of the bandwidth on the system throughput is not large is solved. That is, the present application can improve system throughput to obtain a large reception gain by repeatedly transmitting the transport block. In addition, in the present application, the size of the transport block is larger than the first number of bits, and the transmission efficiency can be further improved compared to the case where the size of the transport block is smaller than the first number of bits.

In addition, in the embodiment of the present application, the physical time-frequency resources occupied by the multi-time-unit transmission have multiple frequency domain units or a larger frequency band in the frequency domain, and the size of the transmission block transmitted by the multi-time-unit is larger than the number of bits that can be carried by one time unit, so that the data transmission efficiency of the IoT scenario and the MTC scenario can be greatly improved.

The multi-time unit transmission method shown in fig. 5 is explained by taking downlink data transmission as an example. The multi-time-unit transmission method shown in fig. 5 can also be applied to uplink data transmission, for example, compared with fig. 5, step 101 is replaced by: the terminal sends the transmission blocks on a plurality of time units; the network device receives the transport block over the plurality of time units. The time units occupied by the multi-time unit transmission in the time domain are the multiple time units, the size of the transmission block is larger than the first bit number and smaller than the second bit number, and so on, similar to the related explanation of fig. 5.

Referring to fig. 6, fig. 6 is a flowchart illustrating another multi-time-unit transmission method according to an embodiment of the present disclosure. Compared with the multi-time cell transmission method shown in fig. 5, the multi-time cell transmission method shown in fig. 6 adds specific descriptions of the configuration of multiple time cells, the transmission of downlink control information, and related operations such as decoding by the terminal based on the received transport block. Specifically, as shown in fig. 6, the multi-time unit transmission method may include:

201. a sending end determines the size of a transmission block transmitted by a plurality of time units;

202. the sending end sends the transmission block on the physical time-frequency resource occupied by the multi-time unit transmission based on the size of the transmission block; and the receiving end receives the transmission block on the physical time-frequency resource occupied by the multi-time unit transmission based on the size of the transmission block.

Before 201, whether uplink data transmission or downlink data transmission is performed, the network device may send time domain resource information, frequency domain resource information, and modulation and coding information to the terminal. Accordingly, the terminal may determine the size of the transmission block to be transmitted or received based on the time domain resource information, the frequency domain resource information, and the modulation and coding information, so that the transmission block is transmitted or received on the physical time-frequency resource occupied by the multi-time-unit transmission based on the size of the transmission block.

In both uplink data transmission and downlink data transmission, the configuration modes of the time domain resource information and the frequency domain resource information, that is, the mode in which the network device configures the physical time-frequency resources occupied by multi-time unit transmission to the terminal, may be configured in one or more of the semi-static, dynamic and static modes described above. For example, the network device may send time domain resource information, frequency domain resource information, and modulation coding information to the terminal through the downlink control information.

The time domain resource information can indicate a plurality of time units of physical time frequency resources occupied by multi-time unit transmission on a time domain; the frequency domain resource information may indicate a number of frequency domain units in the frequency domain of physical time-frequency resources occupied by the multi-time unit transmission. For example, the plurality of frequency domain units may be a plurality of subcarriers, a plurality of resource blocks, a plurality of resource block groups, or a frequency band greater than 180kHz, etc. That is, a network device transmits transport blocks over multiple time units, including: the network device transmits the transport block in a frequency domain unit for each of a plurality of time units. Wherein, the number of the frequency domain units on each time unit is a plurality.

In an optional implementation manner, the determining, by the terminal, the size of the transport block transmitted in multiple time units according to the time domain resource information, the frequency domain resource information, and the modulation and coding information includes: the terminal determines physical time-frequency resources occupied by multi-time unit transmission according to the time domain resource information and the frequency domain resource information; the terminal determines the total number of REs occupied by the multi-time unit transmission based on a plurality of time units of the physical time-frequency resource in a time domain and a plurality of frequency units in a frequency domain; and the terminal calculates the product of the total number of the REs and the modulation order and the coding rate indicated by the modulation and coding information, and takes the product as the size of the transmission block transmitted by the multi-time unit.

The total number of REs may be the number of all REs on the physical time-frequency resource, or the number of REs used for carrying uplink data or downlink data on the physical time-frequency resource.

In another embodiment, the terminal may calculate the product between the total number of REs and the equivalent spectral efficiency as the transport block size for the multi-time unit transmission. Wherein, the equivalent spectral efficiency is the number of bits of the original data before encoding which is averagely carried on each RE.

In another embodiment, the product obtained by the two embodiments above may be combined with a table predefined by the protocol, and a numerical rounding-down operation or a numerical rounding-up operation is performed on the product to obtain the size of the transport block transmitted by the multiple time units. Wherein the predefined table comprises a plurality of numerical values. Rounding down the product refers to selecting the largest value from a plurality of values that are smaller than the product. Performing a numerical approach value operation on the product means selecting the largest value from a plurality of numerical values that are closest to the product.

For example, selecting one or more values from a predefined table that are less than the product; subtracting a constant K from each of the one or more values to obtain one or more values subtracted by the constant K; and selecting the largest value from one or more values obtained by subtracting the constant K as the size of the transmission block transmitted by the multi-time unit. As another example, from a predefined table, one or more values that are closest to the product are selected; subtracting a constant K from each of the one or more values to obtain one or more values from which the constant K is subtracted; and selecting the largest value from one or more values obtained by subtracting the constant K as the size of the transmission block transmitted by the multi-time unit. Wherein the constant K can be 0, 8, 16, 24, 32.

In another optional implementation manner, the determining, by the terminal, the size of the transport block transmitted in multiple time units according to the time domain resource information, the frequency domain resource information, and the modulation and coding information includes: the terminal determines physical time-frequency resources occupied by multi-time unit transmission according to the time domain resource information and the frequency domain resource information; the terminal determines the number of REs in a second time unit in the time domain according to the physical time domain resource; the terminal determines the second product as a transport block size for the multi-time unit transmission.

Wherein the second product is a product between the first product and a number of time units of the physical time domain resource in a time domain. The first product is a product of the number of REs in the second time unit, the modulation order in the second time unit, and the coding rate in the second time unit. Optionally, the first product may also be a product between the number of REs over the second time unit and the equivalent spectral efficiency. The equivalent spectral efficiency is the number of bits of the original data before encoding, which is averagely carried on each RE in the physical time-frequency resource.

For example, the second time unit is a time unit with the least or the most number of REs in the plurality of time units. The number of REs in a time unit refers to the number of RE resources allocated by the network device for the terminal to transmit the data channel in the time unit, or the number of RE resources actually available for the terminal to transmit the data channel allocated by the network device for the terminal in the time unit, or the number of all RE resources allocated by the network device for the terminal in the time unit.

Correspondingly, the number of REs in the second time unit refers to the number of RE resources allocated by the network device for the terminal to transmit the data channel in the second time unit, or the number of RE resources actually available for transmitting the data channel of the terminal allocated by the network device for the terminal in the second time unit, or the number of all RE resources allocated by the network device for the terminal in the second time unit.

In one possible implementation, the second time unit is any one of the plurality of time units.

Optionally, in this embodiment, based on a table predefined by a protocol, a numerical value rounding-down operation or a numerical value rounding-up operation may be performed on the second product to obtain a size of a transmission block transmitted by the multiple time units.

The size of the obtained transmission block is larger than a first bit number and smaller than a second bit number; the first bit number is the number of bits that can be borne by a first time unit in the plurality of time units; the second bit number is a total bit number that can be carried by the plurality of time units. Wherein the first number of bits is determined based on the number of resource elements in the first time unit and a modulation order of the first time unit. For example, the first number of bits is a product of the number of resource elements in the first time unit and the modulation order.

In the embodiment of the present application, the number of REs in one time unit is determined based on the frequency domain unit occupied by the time unit in the time domain based on the physical time-frequency resources occupied by multi-time unit transmission. The frequency domain unit occupied by one time unit in the multi-time unit transmission is determined based on frequency domain resource information and/or downlink control information configured by the network equipment for the terminal equipment, or determined according to system pre-configuration.

The ratio of the size of a transmission block transmitted by a multi-time unit to a first bit number is larger than a first value, and the first value is larger than 1; and the ratio of the size of the transmission block transmitted by the multi-time unit to the second bit number is greater than a second value and less than or equal to 1, and the second value is less than 1.

Optionally, the first value is 1.25, 1.33 or 1.5.

Optionally, the second value is 0.23, 0.2, 0.15 or 0.1.

In one embodiment, step 101 or 203, transmitting the transport block over a plurality of time units includes: and for one time unit in the plurality of time units, carrying out rate matching on the transmission block sent on the time unit according to the RV corresponding to the time unit, and sending the transmission block subjected to the rate matching on the time unit. Optionally, the data after rate matching may be subjected to a series of processing, and then the processed data is sent to the receiving end through the air interface. Wherein the series of processes may be related processes of a physical layer. For example, the series of processes may include one or more of scrambling, layer mapping, precoding, and the like. Here, the rate matching may be the term RV introduction part described above, and the correlation process before the transport block is stored in the circular buffer.

Accordingly, a terminal receives a transport block over a plurality of time units, comprising: for one time unit in a plurality of time units, determining the RV corresponding to the time unit; and receiving the transmission block subjected to rate matching on the time unit according to the RV corresponding to the time unit.

For example, the RV corresponding to each of the multiple time units occupied by the multi-time unit transmission is indicated by downlink control information, RRC signaling, system message, broadcast message, or MAC CE. And the terminal receives the information received, and further determines RVs corresponding to the time units transmitted by the multiple time units.

For another example, the RV corresponding to each of the multiple time units occupied by the multi-time unit transmission is pre-configured in the system. The RV corresponding to one time unit in the multiple time units is included in the candidate RVs, and RVs of different time units may be the same or different.

Optionally, the number of candidate RVs is determined based on a ratio between the TBS and the first number of bits. The ratio between the TBS transmitted in the multi-time unit and the first bit number may also be referred to as an equivalent code rate in the first time unit in the multi-time unit transmission. That is, the number of candidate RVs for multi-time unit transmission is related to the equivalent code rate at the first time unit in the multi-time unit transmission. Accordingly, when the equivalent code rate over the first time unit in the multi-time unit transmission is within a certain specified interval, the number of candidate RVs and the positions of the candidate RVs in the ring buffer may be determined based on the interval. For example, the positions of the candidate RVs in the ring buffer may be obtained by uniformly distributing or non-uniformly distributing the number of candidate RVs in the ring buffer. For example, the M candidate RVs are uniformly distributed in the circular buffer, which means that the data in the circular buffer is divided into M equal parts, and the starting point of each part of data corresponds to one RV. M is an integer greater than or equal to 2.

The first time unit, specifically which time unit of the multiple time units transmitted in the time domain is referred to the related embodiments in the above summary, and details are not described here.

For example, as shown in table 3 or table 4, r is the equivalent code rate in the first time unit, N may be 1.33 or a value greater than 1.33, and k is an integer greater than 3. For example, if the equivalent code rate in the first time unit in the multi-time unit transmission is 2, based on table 3, the number of candidate RVs in the ring buffer can be determined to be 8, and the positions of the 8 RVs can be determined, as shown in fig. 7b, the data in the ring buffer can be divided into 8 equal parts, and the start point of each part of data corresponds to one RV.

For example, assuming that the size of the transmission block is 100 bits, a mother code with 3 times code rate is used for coding to obtain 300-bit coded data; the 300-bit encoded data is stored in a circular buffer as shown in fig. 7 a. Since the circular buffer has 4 uniformly distributed RV candidates, when taking coded data from any one RV start, at least 300/4, that is, 75 bits, is needed to complete the transmission of the data of the transport block.

However, in the multi-time-unit transmission, the equivalent code rate in the first time unit is larger, that is, the ratio between the size of the transport block and the total number of bits that can be carried in the first time unit in the multi-time-unit transmission is larger, for example, the equivalent code rate is 3/2. Then, under the condition that the size of the transport block is not changed, in order to ensure the equivalent code rate, the encoded data mapped on the time unit needs to be reduced, that is, the data amount taken from the circular buffer is reduced, and only the data amount smaller than 75 bits can be taken; for example, only a part of the data covered by gray in fig. 7a can be taken, and the data of the white part cannot be taken. Furthermore, since each time unit selects data from the candidate RV as a starting point, when data is fetched from any one RV starting point, a part of data in the circular buffer shown in fig. 7a cannot be fetched, and thus cannot be transmitted.

As can be seen from the above redundancy version determination method and table 3, since the number of candidate RVs with an equivalent code rate of 3/2 is 8, as shown in fig. 7b, every time 37.5 bits of data are taken at least from the start of the RV corresponding to the time unit for each time unit, all data in the circular buffer can be mapped to a plurality of time units and transmitted. Therefore, the coding gain damage caused by the fact that a part of data cannot be transmitted is avoided.

Therefore, as shown in fig. 7a, in order to ensure that the original data stored in the circular buffer after being encoded by the mother code with 3 times code rate can be selected, each RV needs to cover at least 3/4 original bit length. Therefore, the equivalent code rate of the first time unit cannot be greater than 1.33 (i.e. the number of bits that the first time unit can carry/the original number of bits is 1 divided by 3/4, which is equal to about 1.33).

TABLE 3

TABLE 4

As shown in fig. 8, it is assumed that a plurality of time units occupied by multi-time unit transmission are 8 time slots, and RVs corresponding to the 8 time slots are: timeslot 0 corresponds to RV 0; timeslot 1 corresponds to RV 1; slot 2 corresponds to RV 2; timeslot 3 corresponds to RV 3; timeslot 4 corresponds to RV 4; timeslot 5 corresponds to RV 5; timeslot 6 corresponds to RV 6; time slot 7 corresponds to RV 7. That is, the transport blocks transmitted by multiple time units are encoded and then put into the ring buffer; the sending end obtains the data size which can be carried by the time slot 0 from the ring buffer by taking the RV0 as a starting point, and the data size is mapped to the time slot 0 after processing; the sending end obtains the data size which can be carried by the time slot 1 from the ring buffer by taking the RV1 as a starting point, and the data size is mapped to the time slot 1 after processing; the sending end obtains the data size which can be carried by the time slot 2 from the ring buffer by taking the RV2 as a starting point, and the data size is mapped to the time slot 2 after processing; the sending end obtains the data size which can be carried by the time slot 3 from the ring buffer by taking the RV3 as a starting point, and the data size is mapped to the time slot 3 after processing; taking RV4 as a starting point, acquiring the data volume which can be carried by the time slot 4, and mapping the data volume to the time slot 4 after processing; the sending end obtains the data size which can be carried by the time slot 5 from the ring buffer by taking the RV5 as a starting point, and the data size is mapped to the time slot 5 after processing; the sending end acquires the data volume which can be carried by the time slot 6 from the ring buffer by taking the RV6 as a starting point, and the data volume is mapped to the time slot 6 after processing; the transmitting end finally obtains the data amount that can be carried by the time slot 7 from the ring buffer by taking the RV7 as a starting point, and maps the data amount onto the time slot 7 after processing.

In the embodiments provided in the present application, the method provided in the embodiments of the present application is introduced from the perspective of a network device, a terminal, and interaction between the network device and the terminal. In order to implement the functions in the method provided by the embodiments of the present application, the network device and the terminal may include a hardware structure and/or a software module, and the functions are implemented in the form of a hardware structure, a software module, or a hardware structure and a software module. Whether any of the above-described functions is implemented as a hardware structure, a software module, or a hardware structure plus a software module depends upon the particular application and design constraints imposed on the technical solution.

Referring to fig. 9, fig. 9 is an exemplary diagram of a wireless communication system according to an embodiment of the present application, and as shown in fig. 9, the wireless communication system includes a transmitting device and a receiving device.

For downlink data transmission, the sending device may be the network device in fig. 2, and may perform the related functions of the sending end or the network device in the foregoing method; alternatively, the transmitting device may be an apparatus in a network device; wherein the apparatus may be a system-on-a-chip. The chip system may be composed of a chip, or may include a chip and other discrete devices. Wherein the transmitting device comprises at least one processing module 302 and a communication module 301.

Correspondingly, the receiving device may be the terminal in fig. 2, and may be capable of performing the related functions of the terminal or the receiving end in the foregoing method; alternatively, the receiving apparatus may be a device in a terminal; wherein the apparatus may be a system-on-a-chip. The chip system may be formed by a chip, or may include a chip and other discrete devices. Wherein the receiving device comprises at least one processing module 401 and a communication module 402.

For uplink data transmission, the sending device may be the terminal in fig. 2, and may be capable of executing the relevant functions of the sending end or the terminal in the foregoing method; alternatively, the transmitting device may be an apparatus in a terminal; wherein the apparatus may be a system-on-a-chip. The chip system may be composed of a chip, or may include a chip and other discrete devices. Wherein the transmitting device comprises at least one processing module 302 and a communication module 301.

Correspondingly, the receiving device may be the network device in fig. 2, and may be capable of performing the related functions of the network device or the receiving end in the foregoing method; alternatively, the receiving device may be an apparatus in a network device; wherein the apparatus may be a system-on-a-chip. The chip system may be formed by a chip, or may include a chip and other discrete devices. Wherein the receiving device comprises at least one processing module 401 and a communication module 402. Illustratively, a communication module 301 for transmitting a transport block to a receiving device over a plurality of time units; a size (TBS) of the transport block is greater than a first number of bits and less than a second number of bits; the first bit number is the number of bits that can be borne by a first time unit in the plurality of time units; the second bit number is the total bit number capable of being carried in the plurality of time units.

Wherein a ratio between the TBS and the first number of bits is greater than a first value, the first value being greater than 1; and the ratio of the TBS to the second bit number is greater than a second value and less than or equal to 1, and the second value is less than 1.

Optionally, the first value is 1.25, 1.33 or 1.5; the second value is 0.23, 0.2, 0.15 or 0.1.

In one possible embodiment, the first number of bits is determined based on the number of resource elements in the first time unit and a modulation order of the first time unit.

In a possible implementation, the communication module 301 sends a transport block in multiple time units, specifically: transmitting a transport block on a frequency domain unit of each of a plurality of time units; the number of the frequency domain units of each time unit is respectively a plurality. That is, the multi-time cell transmission occupies not only multiple time cells in the time domain, but also multiple frequency domain cells in each time domain.

In a possible implementation manner, the processing module 302 is configured to perform, for one time unit in multiple time units, rate matching on a transport block sent in the time unit according to an RV corresponding to the time unit; and the communication module is further configured to send the transport block subjected to rate matching in the time unit. The RV corresponding to the time unit is included in the candidate RVs.

In one possible embodiment, the number of candidate RVs is determined based on a ratio between the TBS and the first number of bits.

In one possible embodiment, the location of the RV candidate is determined based on a ratio between the TBS and the first number of bits.

It can be understood that, for specific implementation of each functional unit included in the network device, reference may be made to the foregoing embodiments, and details are not described here.

As shown in fig. 9, the receiving device includes a communication module 401 and a processing module 402, wherein:

the communication module 401 is configured to receive a transport block sent by a network device over multiple time units;

a size (TBS) of the transport block is greater than a first number of bits and less than a second number of bits; the first bit number is the number of bits that can be borne by a first time unit in the plurality of time units; the second bit number is the total bit number capable of being carried in the plurality of time units.

In a possible embodiment, the ratio between said TBS and said first number of bits is greater than a first value, said first value being greater than 1; and the ratio of the TBS to the second bit number is greater than a second value and less than or equal to 1, and the second value is less than 1.

In a possible implementation, the first number of bits is determined based on the number of resource elements in the first time unit and a modulation order of the first time unit.

In one possible embodiment, as shown in fig. 9, the processing module 402 in the terminal is configured to calculate the size of the transport block transmitted in the plurality of time units; in turn, the communication module 401 may receive the transport block over the plurality of time units based on the transport block size.

In a possible implementation, the communication module 401 receives a transmission block in multiple time units, specifically: the communication module 401 receives the transport block in the frequency domain unit of each of the plurality of time units according to the transport block size; the number of the frequency domain units of each time unit is respectively a plurality.

In a possible implementation, the communication module 401 receives a transmission block in multiple time units, specifically: for one time unit in a plurality of time units, determining the RV corresponding to the time unit; and receiving the transmission block subjected to rate matching on the time unit according to the RV corresponding to the time unit. The RV corresponding to the time unit is included in the candidate RVs.

In one possible embodiment, the location of the candidate RV is determined based on a ratio between the TBS and the first number of bits.

It can be understood that, for specific implementation of each functional unit included in the terminal, reference may be made to the foregoing embodiments, and details are not described here again.

The division of the modules in the embodiments of the present application is schematic, and only one logical function division is provided, and in actual implementation, there may be another division manner, and in addition, each functional module in each embodiment of the present application may be integrated in one processor, may also exist alone physically, or may also be integrated in one module by two or more modules. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode.

Referring to fig. 10, fig. 10 is a diagram illustrating an apparatus 1000 according to an embodiment of the present application, configured to implement the functions of a network device or the functions of a terminal in the foregoing method. The apparatus may be a network device, or an apparatus in a network device. Or the device may be a terminal or a device in a terminal. Wherein the apparatus may be a system-on-a-chip. In the embodiment of the present application, the chip system may be composed of a chip, and may also include a chip and other discrete devices. The apparatus 1000 includes at least one processor 1020, which is configured to implement the functions of the network device or the functions of the terminal in the methods provided in the embodiments of the present application. For example, the processor 1020 may determine sizes of transmission blocks transmitted in multiple time units, and send or receive the transmission blocks in multiple time units through the interface, which is specifically described in detail in the method example and is not described herein again.

The apparatus 1000 may also include at least one memory 1030 for storing program instructions and/or data. A memory 1030 is coupled to the processor 1020. The coupling in the embodiments of the present application is an indirect coupling or a communication connection between devices, units or modules, and may be an electrical, mechanical or other form for information interaction between the devices, units or modules. Processor 1020 may operate in conjunction with memory 1030. Processor 1020 may execute program instructions stored in memory 1030. At least one of the at least one memory may be included in the processor.

Apparatus 1000 may also include a communication interface 1010 for communicating with other devices over a transmission medium such that the apparatus used in apparatus 1000 may communicate with other devices. Illustratively, the other device may be a terminal or a network device. Illustratively, the communication interface may be a transceiver, circuit, bus, module, or other type of communication interface. The processor 1020 transmits and receives data using the communication interface 1010 and is configured to implement the method performed by the network device in the embodiment corresponding to fig. 5 to 8 or the method performed by the terminal in the embodiment corresponding to fig. 5 to 8.

The specific connection medium among the communication interface 1010, the processor 1020 and the memory 1030 is not limited in the embodiments of the present application. In the embodiment of the present application, the memory 1030, the processor 1020, and the communication interface 1010 are connected by a bus 1040 in fig. 10, the bus is represented by a thick line in fig. 10, and the connection manner between other components is merely illustrative and not limited thereto. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 10, but this is not intended to represent only one bus or type of bus.

In the embodiments of the present application, the processor may be a general-purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, and may implement or execute the methods, steps, and logic blocks disclosed in the embodiments of the present application. A general purpose processor may be a microprocessor or any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in a processor.

In the embodiment of the present application, the memory may be a nonvolatile memory, such as a Hard Disk Drive (HDD) or a solid-state drive (SSD), and may also be a volatile memory, for example, a random-access memory (RAM). The memory is any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited to such. The memory in the embodiments of the present application may also be circuitry or any other device capable of performing a storage function for storing program instructions and/or data.

The methods provided in the embodiments of the present application may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the invention to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, a network appliance, a user device, or other programmable apparatus. The computer instructions may be stored on a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wire (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)), or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic tape), an optical medium (e.g., a Digital Video Disk (DVD)), or a semiconductor medium (e.g., an SSD), among others.

In the embodiments of the present application, the embodiments may refer to each other, for example, methods and/or terms between the embodiments of the method may refer to each other, for example, functions and/or terms between the embodiments of the apparatus and the embodiments of the method may refer to each other, without logical contradiction.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims

1. A method for multi-time cell transmission, comprising:

transmitting transport blocks, TBs, over a plurality of time units;

the size TBS of the TB is larger than a first bit number and smaller than a second bit number; the first bit number is the number of bits that can be borne by a first time unit in the multiple time units; the second bit number is the total bit number which can be borne by the plurality of time units;

the transmitting transport blocks over a plurality of time units comprises:

for one time unit in a plurality of time units, carrying out rate matching on a transmission block to be transmitted on the time unit according to a Redundancy Version (RV) corresponding to the time unit, and transmitting the transmission block subjected to the rate matching on the time unit; the candidate RV comprises the RV corresponding to the time unit;

the number of RV candidates is determined based on a ratio between the TBS and the first number of bits.

2. The transmission method of claim 1, wherein a ratio of the TBS to the first number of bits is greater than a first value, and wherein the first value is greater than 1;

and the ratio of the TBS to the second bit number is greater than a second value and less than or equal to 1, and the second value is less than 1.

3. The transmission method according to claim 2, wherein the first value is 1.25, 1.33 or 1.5; the second value is 0.23, 0.2, 0.15 or 0.1.

4. The transmission method according to any of claims 1 to 3, wherein the first number of bits is determined based on the number of resource elements in the first time unit and the modulation order of the first time unit.

5. The transmission method according to any one of claims 1 to 3, wherein said transmitting the transport blocks over a plurality of time units comprises:

transmitting a transport block on a frequency domain unit of each of the plurality of time units;

the number of the frequency domain units of each time unit is respectively a plurality.

6. The transmission method according to any of claims 1 to 3, wherein the position of the RV candidate is determined based on a ratio between the TBS and the first number of bits.

7. A method for multi-time cell transmission, comprising:

receiving a transport block, TB, over a plurality of time units;

the size TBS of the TB is larger than a first bit number and smaller than a second bit number; the first bit number is the number of bits that can be borne by a first time unit in the plurality of time units; the second bit number is the total bit number which can be borne by the plurality of time units;

the receiving a transport block over a plurality of time units comprises:

for one time unit in a plurality of time units, receiving a transmission block subjected to rate matching on the time unit according to the RV corresponding to the time unit; the candidate RV comprises the RV corresponding to the time unit;

8. The transmission method of claim 7, wherein a ratio of the TBS to the first number of bits is greater than a first value, and wherein the first value is greater than 1; and is

The ratio of the TBS to the second number of bits is greater than a second value and less than or equal to 1, and the second value is less than 1.

9. The transmission method according to claim 8, wherein the first value is 1.25, 1.33 or 1.5; the second value is 0.23, 0.2, 0.15 or 0.1.

10. The transmission method according to any of claims 7 to 9, wherein the first number of bits is determined based on the number of resource elements in the first time unit and the modulation order of the first time unit.

11. The transmission method according to any of claims 7 to 9, wherein the receiving of the transport blocks over a plurality of time units comprises:

receiving a transport block on a frequency domain unit of each of the plurality of time units;

12. The transmission method according to any of claims 7 to 9, wherein the location of the candidate RV is determined based on the ratio between the TBS and the first number of bits.

13. A communication device, characterized in that it is adapted to implement the method according to any of claims 1 to 6.

14. A communication device arranged to implement the method of any of claims 7 to 12.

15. A communications device comprising a processor and a memory, the memory coupled to the processor, the processor configured to perform the method of any of claims 1 to 6.

16. A communications device comprising a processor and a memory, the memory coupled to the processor, the processor configured to perform the method of any of claims 7 to 12.

17. A communication system comprising a communication device according to claim 13 or 15 and a communication device according to claim 14 or 16.

18. A computer-readable storage medium comprising instructions that, when executed on a computer, cause the computer to perform the method of any of claims 1 to 6; or cause a computer to perform the method of any of claims 7 to 12.