CN109392022B

CN109392022B - Data transmission method, terminal equipment and network equipment

Info

Publication number: CN109392022B
Application number: CN201710687565.5A
Authority: CN
Inventors: 苏立焱; 官磊
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2017-08-11
Filing date: 2017-08-11
Publication date: 2022-04-05
Anticipated expiration: 2037-08-11
Also published as: CN109392022A; WO2019029473A1

Abstract

The application provides a data transmission method, which can realize data transmission with low code rate and can be used for communication systems, such as V2X, LTE-V, V2V, Internet of vehicles, MTC, IoT, LTE-M, M2M, Internet of things and the like. The method comprises the following steps: receiving downlink control information, wherein the downlink control information comprises resource allocation information of a data channel, MCS indication information and adjustment factor indication information, the adjustment factor indication information indicates one adjustment factor in a value set of the adjustment factor configured by a high-level signaling, and the adjustment factor is used for determining a first TBS of the data channel; determining an adjustment factor from a value set of the adjustment factor according to the indication information of the adjustment factor, and determining an MCS index from a candidate MCS index set according to the indication information of the MCS; determining a first TBS according to the resource allocation information, the MCS index and the adjustment factor; and receiving or transmitting the data channel according to the first TBS.

Description

Data transmission method, terminal equipment and network equipment

Technical Field

The present application relates to the field of wireless communications, and in particular, to a method, a terminal device, and a network device for transmitting data.

Background

In a Long Term Evolution (LTE) system, service transmission is scheduled based on a base station. The minimum unit of the base station scheduling is one Transport Block (TB). Generally, the base station calculates a Transport Block Size (TBS) according to a set of known algorithms, and transmits the determined TBS Information, MCS, and resource allocation Information to the terminal device by being carried in Downlink Control Information (DCI). And the terminal equipment receives the DCI and calculates the TBS. And receiving and demodulating the downlink data or sending the uplink data according to the calculated TBS by combining the resource allocation information and the MCS. In current LTE systems, the TBS determination depends only on the MCS and the number of Physical Resource Blocks (PRBs) allocated to the terminal device by the network device. The terminal equipment checks the MCS table and the TBS table according to the number of PRBs and the MCS, and can determine the TBS configured by the network equipment.

However, since the 5G technology will support multi-slot and flexible Reference Signal (RS) configuration, the dynamic range of the number of REs actually used to carry data in one PRB is very large. The method for determining TBS by means of table lookup at present is no longer suitable. In addition, in some scenarios in 5G, for example, Ultra Reliable and Low Latency Communication (URLLC) traffic, the code rate requirement of an extremely Low code rate may occur, and it is impossible to configure the code rate requirement through a table.

Therefore, how to design a new scheme for calculating the TBS, which is designed to address the characteristic of the 5G technology that the dynamic range of the number of REs carrying data is very large, and also to address the requirement of the URLLC service for an ultra-low bit rate that may occur, becomes an urgent problem to be solved.

Disclosure of Invention

The application provides a method for transmitting data, which can realize data transmission with low code rate.

In a first aspect, a method for transmitting data is provided, the method comprising: the method comprises the steps that terminal equipment receives downlink control information from network equipment, wherein the downlink control information comprises resource allocation information of a data channel, indication information of a Modulation and Coding Scheme (MCS) and indication information of an adjustment factor, the indication information of the adjustment factor indicates one adjustment factor in a value set of the adjustment factor configured by a high-level signaling, and the adjustment factor is used for determining a first Transport Block Size (TBS) of the data channel; the terminal equipment determines an adjustment factor from the value set of the adjustment factor according to the indication information of the adjustment factor; the terminal equipment determines an MCS index from a candidate MCS index set according to the indication information of the MCS, wherein the MCS index set comprises at least two candidate MCS indexes; the terminal equipment determines a first TBS according to the resource allocation information, the MCS index and the adjustment factor; and the terminal equipment receives or transmits the data channel according to the first TBS.

With reference to the first aspect, in certain implementations of the first aspect, the method further includes: the first configuration information comprises at least two candidate value sets of the adjustment factors; and the terminal equipment determines the value set of the adjustment factor according to the MCS index, the corresponding relation between at least two candidate MCS indexes in the candidate MCS index set and at least two candidate value sets of the adjustment factor.

With reference to the first aspect, in some implementations of the first aspect, the value set of the adjustment factor is a subset of an adjustment factor resource pool, where the adjustment factor resource pool at least includes 1.

With reference to the first aspect, in some implementations of the first aspect, the determining, by the terminal device, the first TBS according to the resource allocation information, the MCS, and the adjustment factor includes: the terminal equipment calculates the first TBS according to the following formula:

or

Wherein N is_PRBThe number of PRBs allocated to the terminal device by the network device,

or

The number of REs used for bearing downlink and uplink data on one PRB in one time slot, v is the number of layers mapped by the data channel, and Q_mIs the modulation order, R is the code rate, eta_DLAnd η_ULThe adjustment factors used for downlink and uplink are used respectively.

With reference to the first aspect, in some implementations of the first aspect, the determining, by the terminal device, the first TBS according to the resource allocation information, the MCS, and the adjustment factor includes: the terminal device calculates the second TBS according to the following formula:

or

or

The number of REs for carrying downlink and uplink data on one PRB in one time slot, v is the number of layers mapped by a data channel, and Q_mIs the modulation order, R is the code rate, eta_DLAnd η_ULThe adjustment factors used for downlink and uplink respectively; and the terminal equipment selects the first TBS from a TBS set according to the second TBS, wherein the TBS set is predefined or configured through high-layer signaling.

With reference to the first aspect, in some implementations of the first aspect, the first TBS and the second TBS satisfy a first mapping relationship, where the first mapping relationship includes any one of: the first TBS is the value in the TBS set that is closest to the second TBS; the first TBS is the maximum value in the TBS set that is not greater than the second TBS; the first TBS is the minimum value in the TBS set that is not less than the second TBS.

With reference to the first aspect, in certain implementations of the first aspect, the terminal device selects the first TBS from a TBS set according to a second TBS, where the first TBS is a value in the TBS set that is closest to the second TBS; or, the first TBS is a maximum value in the TBS set that is not greater than the second TBS; alternatively, the first TBS is a minimum value in the TBS set that is not less than the second TBS.

The network equipment sends downlink control information to the terminal equipment, wherein the downlink control information comprises resource allocation information of a data channel, indication information of a Modulation and Coding Scheme (MCS) and indication information of an adjustment factor, the indication information of the MCS is used for determining an MCS index from a candidate MCS index set, the candidate MCS index set comprises at least two candidate MCS indexes, the indication information of the adjustment factor indicates one adjustment factor in a value set of the adjustment factor configured by a higher layer, and the adjustment factor is used for determining a first Transport Block Size (TBS) of the data channel; and the network equipment transmits or receives the data channel with the terminal equipment according to the first TBS.

With reference to the second aspect, in certain implementations of the second aspect, the method further includes: the network device sends first configuration information to the terminal device through a high-level signaling, wherein the first configuration information comprises at least two candidate value sets of the adjustment factor, and the value set of the adjustment factor is determined according to the MCS index, the corresponding relation between at least two candidate MCS indexes in the candidate MCS index sets and at least two candidate value sets of the adjustment factor.

With reference to the second aspect, in some implementations of the second aspect, the value set of the adjustment factor is a subset of an adjustment factor resource pool, and the adjustment factor resource pool at least includes 1.

With reference to the second aspect, in certain implementations of the second aspect, the first TBS may be calculated according to the following formula:

or

or

The number of REs for carrying downlink and uplink data on one PRB in one time slot, v is the number of layers mapped by a data channel, and Q_mIs the modulation order, R is the code rate, eta_DLAnd η_ULThe adjustment factors used for downlink and uplink respectively

With reference to the second aspect, in certain implementations of the second aspect, the first TBS may be determined according to the following: the second TBS is calculated according to the following formula:

or

or

The number of REs for carrying downlink and uplink data on one PRB in one time slot, v is the number of layers mapped by a data channel, and Q_mIs the modulation order, R is the code rate, eta_DLAnd η_ULThe adjustment factors used for downlink and uplink respectively; the first TBS is selected from a TBS set according to a second TBS, the TBS set being either predefined or configured by higher layer signaling.

With reference to the second aspect, in some implementations of the second aspect, the first TBS and the second TBS satisfy a first mapping relationship, and the first mapping relationship includes any one of: the first TBS is the value in the TBS set that is closest to the second TBS; the first TBS is the maximum value in the TBS set that is not greater than the second TBS; the first TBS is the minimum value in the TBS set that is not less than the second TBS.

With reference to the second aspect, in certain implementations of the second aspect, the network device selects the first TBS from a TBS set according to a second TBS, the first TBS being a value in the TBS set that is closest to the second TBS; or, the first TBS is a maximum value in the TBS set that is not greater than the second TBS; alternatively, the first TBS is a minimum value in the TBS set that is not less than the second TBS.

In a third aspect, the present application provides a terminal device, where the terminal device has a function of implementing the terminal device in the method design of the first aspect. These functions may be implemented by hardware, or by hardware executing corresponding software. The hardware or software includes one or more units corresponding to the above functions.

In a fourth aspect, the present application provides a network device having the function of implementing the network device in the method design of the second aspect. These functions may be implemented by hardware, or by hardware executing corresponding software. The hardware or software includes one or more units corresponding to the above functions.

In a fifth aspect, the present application provides a terminal device comprising a transceiver, a processor, and a memory. The processor is configured to control the transceiver to transceive signals, the memory is configured to store a computer program, and the processor is configured to retrieve and execute the computer program from the memory, so that the terminal device performs the method of the first aspect.

In a sixth aspect, the present application provides a network device comprising a transceiver, a processor, and a memory. The processor is configured to control the transceiver to transceive signals, the memory is configured to store a computer program, and the processor is configured to retrieve and execute the computer program from the memory, so that the network device performs the method of the second aspect.

In a seventh aspect, the present application provides a communication apparatus, which may be a terminal device designed by the above method, or a chip disposed in the terminal device. The communication device includes: a memory for storing computer executable program code; a communication interface, and a processor coupled with the memory and the communication interface. Wherein the program code stored in the memory comprises instructions which, when executed by the processor, cause the communication apparatus to perform the method performed by the terminal device of any one of the possible designs of the first or second aspect.

In an eighth aspect, the present application provides a communication device comprising: the communication device may be a network device designed by the method or a chip arranged in the network device. The communication device includes: a memory for storing computer executable program code; a communication interface, and a processor coupled with the memory and the communication interface. Wherein the program code stored in the memory comprises instructions which, when executed by the processor, cause the communication apparatus to perform the method performed by the network device of any one of the possible designs of the first or second aspect.

In a ninth aspect, the present application provides a computer program product comprising: computer program code which, when run on a computer, causes the computer to perform the method of the above-mentioned aspects.

In a tenth aspect, a computer-readable medium is provided, having program code stored thereon, which, when run on a computer, causes the computer to perform the method of the above aspects.

In an eleventh aspect, the present application provides a chip system comprising a processor for a terminal device to implement the functions referred to in the above aspects, e.g. to receive or process data and/or information referred to in the above methods. In one possible design, the system-on-chip further includes a memory for storing program instructions and data necessary for the terminal device. The chip system may be formed by a chip, or may include a chip and other discrete devices.

In a twelfth aspect, the present application provides a chip system, which includes a processor for enabling a network device to implement the functions referred to in the above aspects, for example, to transmit or process data and/or information referred to in the above methods. In one possible design, the system-on-chip further includes a memory for storing program instructions and data necessary for the network device. The chip system may be formed by a chip, or may include a chip and other discrete devices.

In the embodiment of the application, the network device adjusts the code rate of the transmission data by configuring the adjustment factor, and can flexibly realize data transmission with low code rate according to the characteristic that the dynamic range of the number of the REs bearing data in a future communication system is large.

Drawings

Fig. 1 is a schematic diagram of a communication system suitable for use in embodiments of the present application.

Fig. 2 is a schematic interaction diagram of a method for transmitting data according to an embodiment of the present application.

Fig. 3 is a schematic block diagram of a terminal device 500 according to an embodiment of the present application.

Fig. 4 is a schematic block diagram of a network device 600 according to an embodiment of the present application.

Fig. 5 is a schematic structural diagram of a terminal device 700 according to an embodiment of the present application.

Fig. 6 is a schematic structural diagram of a network device 800 according to an embodiment of the present application.

Detailed Description

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

In the LTE system, downlink and uplink are based on OFDMA and SC-FDMA, respectively, and time-frequency resources are divided into OFDM or SC-FDMA symbols (hereinafter referred to as time-domain symbols, abbreviated as symbols) in the time dimension and subcarriers in the frequency dimension. And the smallest Resource granularity is called a Resource Element (RE), i.e. a time-frequency lattice point that represents a time-domain symbol in the time domain and a subcarrier in the frequency domain.

The transmission of traffic in LTE systems is based on base station scheduling. When the physical layer performs scheduling, the upper layer packet is divided into small packets with Transport Block (TB) as a unit, and the basic time unit of scheduling is generally one subframe, and the duration is 1 ms. One subframe includes two slots, and one slot includes 7 time domain symbols. Further, the LTE evolved system also considers the introduction of shorter time scheduling units, for example, a scheduling manner in units of one time slot or even several time domain symbols. Generally, a specific scheduling procedure is that a base station sends a downlink control channel, and the downlink control channel carries scheduling information of a transport block TB in a downlink data channel or an uplink data channel. The scheduling information includes resource allocation information (i.e., occupied time-frequency resources) of the scheduled TB, and control information such as Modulation and Coding Scheme (MCS) index.

Among them, the Transport Block Size (TBS) is an important step in uplink and downlink transmission. After configuring the TBS, the base station carries the TBS information in the MCS index and resource allocation information in the DCI. And the U blindly detects the DCI, and calculates the TBS according to the resource allocation information and the MCS index. And then, according to the resource allocation information, sending uplink data or receiving downlink data.

In the current LTE system, the determination of TBS depends only on MCS and the number of physical resource blocks PRB allocated by the base station for the terminal (hereinafter referred to as N)_PRB)。

Specifically, the non-special subframe includes a subframe in Frequency Division Duplex (FDD) and a normal subframe in Time Division Duplex (TDD).

The terminal equipment searches the MCS table (such as table 1) through the MCS index to obtain the TBS index, and then searches the TBS table (such as table 2) to obtain the TBS according to the TBS index and the number of allocated PRBs determined from the resource allocation information.

TABLE 1

MCS index	Modulation order	TBS index
			0	2	0
1	2	1
			2	2	2
3	2	3
			……	……	……

TABLE 2

For the special subframe under TDD, the special subframe includes three portions, namely, a downlink pilot time slot (denoted as DwPTS), Guard time (GP), and an uplink pilot time slot (denoted as UpPTS). LTE currently supports 10 different special subframe configurations, and the DwPTS lengths (i.e., the number of time domain symbols) in different configurations are also different. The DwPTS length may be equal to 8-12 symbols. Besides, DwPTS may be only 3 symbols long, and is not used for transmitting downlink data.

For the special subframe, the terminal equipment firstly adopts the same method as the above to obtain the TBS index through MCS index table look-up 1. Then, the TBS is obtained by looking up table 2 based on the TBS index and the number of PRBs (hereinafter referred to as equivalent PRBs) after the conversion. Wherein, the equivalent PRB may be calculated by the following formula (1):

as can be seen from the above process of calculating the TBS when data is carried on the DwPTS, the LTE system configures a parameter of 0.75 to convert the number of allocated PRBs in consideration that the time domain symbols of the DwPTS are less than the time domain symbols of the non-special subframe, and then calculates the TBS according to the converted PRBs. However, no matter the DwPTS is 8 symbols or 12 symbols long, the configured parameters are 0.75, and the flexibility is poor.

While the 5G technology is to support more flexible slot configuration. E.g., a mini-slot, a 7 symbol slot, a 14 symbol slot, etc. Meanwhile, since flexible configuration of Reference Signals (RSs) is to be supported in the 5G technology, the number of REs actually used for carrying data on each PRB is also configurable. Thus, it can be appreciated that in 5G, the dynamic range of the number of REs used to carry data on each PRB is extremely large. For example, from 24 to 120. It is no longer appropriate to continue to calculate TBS in the manner of table lookup in LTE above.

To accommodate 5G, one prior art scheme proposes calculating TBS using the following equation (2):

wherein upsilon is the spatial multiplexing layer number mapped by TB, Q is the modulation order of the modulation coding strategy, R is the code rate, N is_PRBFor the number of PRBs allocated in the frequency domain,

is the number of REs used to carry data in one PRB.

Q and R can be determined according to table 3 below.

TABLE 3

MCS index	Modulation order Q	Code rate R x 1024
			0	2	120
1	2	193
			2	2	308
3	2	449
			……	……	……

As mentioned above, considering that 5G will support multiple slot lengths, some have proposed several implementations based on this scheme.

Mode 1

Stipulate singly

Is used as a default value.

Mode 2

Defining multiple PDSCH lengths for different PDSCH lengths

Is used as a default value.

Mode 3

The network side configures one for each UE

Mode 4

The network side configures one for each UE

Each time the current data transmission is indicated by the DCI

Mode 5

The network side configures one for the UE

Each pass indicating a "false" and smaller value for the UE

The requirement of extremely low code rate under the URLLC scene is met.

For example, assuming higher layer signaling is configured for a certain terminal equipment

Value set of

In slot 1, the number of REs actually available to carry data in each PRB is 120. In slot 2, the number of REs actually available to carry data in each PRB is 80. In timeslot 1, if the code rate required by the URLLC service is half of the lowest code rate in table 3 above, the base station indicates to the terminal device

And the configuration of low code rate is realized. However, in time slot 2, if the code rate required by the URLLC service is still half of the lowest code rate in table 3, the base station has no time to change the preconfigured code rate because the high layer signaling is not sent back frequently

So that the base station cannot configure the terminal device as required

It can be seen that, although the above several manners all want to meet the requirements of the future 5G system for multi-slot length and more flexible TBS, the existing manners still cannot meet the requirements in view of the reasons that the dynamic range of the number of REs used for carrying data in 5G is very large, high-layer signaling is not frequently sent, the URLLC may need a very low code rate, and the specifically needed value of the low code rate cannot be estimated, and forward compatibility is considered.

Therefore, the data transmission method provided by the application can meet the requirements that the dynamic range of the number of REs carrying data in a 5G system is very large, URLLC service possibly needs an extremely low code rate, forward compatibility exists and the like, and can flexibly configure any low code rate for UE in a multi-slot-length scene.

The technical scheme of the application can be applied to various communication systems, such as: a Global System for Mobile communications (GSM) System, a Code Division Multiple Access (CDMA) System, a Wideband Code Division Multiple Access (WCDMA) System, a General Packet Radio Service (GPRS), a Long Term Evolution (LTE) System, an advanced long term evolution (LTE-a) System, a Universal Mobile Telecommunications System (UMTS), an LTE-continuous System, a 4.5G or next Generation communication System (e.g., a Fifth-Generation (5G) System), and the like. Among them, the 5G system may also be referred to as a New Radio access technology (NR) system.

For ease of understanding, a communication system suitable for use in embodiments of the present application will first be briefly described in conjunction with fig. 1.

Referring to fig. 1, fig. 1 is a schematic diagram of a wireless communication system suitable for use in embodiments of the present application. As shown in fig. 1, the wireless communication system includes at least a network device 101 and a terminal device 102. The network device 101 and the terminal device 102 may perform data communication via a wireless connection. For example, 4.5G or 5G communications, etc.

It should be understood that fig. 1 only illustrates the communication system including one network device and one terminal device, but the embodiments of the present application are not limited thereto. The communication system may also comprise more network devices or more terminal devices, for example.

The Network device 101 may be a Base Transceiver Station (BTS) in global system for mobile communications (GSM) or Code Division Multiple Access (CDMA), a Base Station (NodeB, NB) in Wideband Code Division Multiple Access (WCDMA), an evolved Node B (eNB or eNodeB) in Long Term Evolution (LTE), a relay Station, an Access Point or a Radio Remote Unit (RRU), a vehicle-mounted device, a wearable device, a wireless controller in a Cloud Radio Access Network (CRAN) scenario, and a Network side device in a future 5G system, such as a Transmission Point (TP), a Transmission Reception Point (TRP), a Base Station (gbnodeb, gbb), a small Base Station device, and the like.

Terminal Equipment 102 may also be referred to as User Equipment (UE), an access Terminal, a subscriber unit, a subscriber station, a mobile station, a remote Terminal, a mobile device, a User Terminal, a Terminal (Terminal), a wireless communication device, a User agent, or a User device. The terminal device may be a Station (ST) in a Wireless Local Area Network (WLAN), and may be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) Station, a Personal Digital Assistant (PDA) device, a handheld device with Wireless communication function, a computing device or other processing device connected to a Wireless modem, a vehicle-mounted device, a wearable device, and a next-generation communication system, for example, a terminal device in a 5G Network or a terminal device in a future-evolution Public Land Mobile Network (PLMN) Network, and the like.

The method for transmitting data provided by the embodiment of the present application is described in detail below with reference to fig. 2. Fig. 2 is a schematic interaction diagram of a method for transmitting data according to an embodiment of the present application.

210. The network device sends the downlink control information to the terminal device, and the terminal device receives the downlink control information from the network device.

The downlink control information includes resource allocation information of a data channel, indication information of a Modulation and Coding Scheme (MCS) and indication information of an adjustment factor.

The indication information of the MCS is used to determine an MCS index from the candidate MCS index set. Wherein the candidate MCS index set comprises at least two candidate MCS indexes.

The indication information of the adjustment factor indicates one adjustment factor in the value set of the adjustment factor configured by the high-level signaling. Or, a specific value of the adjustment factor is indicated. The adjustment factor is used to determine a first TBS for the data channel.

The resource allocation information comprises the number N of PRBs in the frequency domain allocated to the terminal equipment by the network equipment_PRBThe number of REs used for carrying data on one PRB in one time slot allocated by the network equipment is recorded as the number of REs used for carrying data on one PRB in one time slot during downlink transmission

Record when uplink transmission

In step 210, the network device sends information for calculating a transport block size, TBS, of the data channel (referred to herein as a first TBS) to the terminal device on the PDCCH.

Correspondingly, the UE receives the downlink control information carried on the PDCCH by performing blind detection on the PDCCH, and further obtains resource allocation information, MCS indication information, and adjustment factor indication information.

Before sending downlink control information to the terminal device, the network device first needs to determine a specific value of the adjustment factor and an adopted MCS index.

The network equipment can allocate downlink wireless resources to each terminal equipment according to the downlink channel state information and downlink buffer data transmitted by the network equipment at the high level; or allocating uplink radio resources to each terminal device according to the uplink channel state information and the buffer state report received from the terminal device. The principle of allocating radio resources includes, but is not limited to, maximum rate principle, proportional fairness principle, and polling principle.

After determining the radio resource allocated to a certain terminal device, the network device determines an MCS and/or an adjustment factor to be used for transmission according to the channel state information of the terminal device on the radio resource and the reliability required to be achieved by data transmission (for example, the data transmission required in the LTE system reaches 90% accuracy, and the URLLC required reaches 99.999% accuracy). Compared with the case of better channel state, if the channel state of the terminal device is worse, the transmission will adopt lower-order MCS and smaller adjustment factor. Furthermore, if the terminal device needs to achieve higher reliability than needed to achieve lower reliability, the transmission will use a lower order MCS and smaller adjustment factors.

220. And the terminal equipment determines the adjustment factor from the value set of the adjustment factor according to the indication information of the adjustment factor.

230. And the terminal equipment determines the MCS index from the candidate MCS index set according to the indication information of the MCS.

The candidate MCS index set includes at least two candidate MCS indexes. The terminal device may determine, according to the MCS indication information, an MCS index that should be used for receiving or transmitting the data channel indicated by the network device.

The candidate MCS index set is predefined, most candidate MCS indexes in the set correspond to fixed modulation orders and code rates (for example, candidate MCS indexes 0-28 in the LTE system), and other candidate MCS indexes in the set (for example, candidate MCS indexes 29-31 in the LTE system) do not correspond to fixed modulation orders and code rates, and the modulation orders and the code rates need to be determined according to other predefined rules.

It should be understood that step 220 is not in sequence with step 230.

Optionally, the network device pre-configures an adjustment factor resource pool for the terminal device, where the adjustment factor resource pool includes all possible values of the adjustment factor. The adjustment factor resource pool comprises at least 1.

It can be understood that the adjustment factor resource pool includes at least 1, so as to ensure that when the rate code rate required by the URLLC service is not lower than the lowest code rate in table 3, the code rate can be determined by looking up table 3.

Subsequently, the network device may configure a value set of the adjustment factor for the terminal device through a high-level signaling, where the value set of the adjustment factor is a subset of the adjustment factor resource pool.

For example, assume that the set of values of the adjustment factor is {0.5,0.6,0.7,1 }.

The network device may indicate the set of values of the adjustment factor by 2 bits. For example, values of the adjustment factor of 0.5,0.6,0.7, and 1 are indicated by "00", "01", "10", and "11", respectively.

In this embodiment, the value set of the adjustment factor configured by the network device may be related to the MCS. In other words, different sets of values of the adjustment factor may be configured for different MCS indices.

Referring to table 4, table 4 shows a corresponding relationship between the MCS index and the value set of the adjustment factor. Where η represents the adjustment factor.

TABLE 4

MCS Group	0	1	…	M
					Set ofη	{η_0,0,…,η_0,k}	{η_1,0,…,η_1,k}		{η_M,0,…,η_M,k}

According to different MCS modes, different values are configured for the adjustment factors, and time-frequency resources can be saved.

For example, when SNR is-3 dB, the required code rate is 0.12 if BLER is to be achieved at 10^ -5. When SNR is 0.2dB, the required code rate is 0.25 if BLER is to be 10^ -5. When SNR is 3.3dB, the required code rate is 0.5 if BLER is to be 10^ -5.

The values of the required adjustment factors corresponding to the three MCS modes can be seen in table 5.

TABLE 5

It can be seen that, because the values of the corresponding adjustment factors are the same or similar, the MCS index 1 and the index 3 may form the same MCS group, and the MCS index 4, the index 1 and the index 3 belong to different MCS groups.

The following illustrates how different values of the configured adjustment factor can save transmission resources according to different MCS modes.

The base station serves UE #1 with a scheduling of 6PRB, MCS index 1, η ═ 1, and error rate of 10%. UE #2 is served with a scheduling 6PRB, MCS index 4, η ═ 1, and error rate 10%. After the arrival of URLLC traffic, the error rate needs to be reduced to 10^ -5. At this time, the base station

MCS index 1, η ═0.6 serving UE #1,

the MCS index 4, η ═ 0.83 serves UE # 2. Compared with the case that all eta are configured to be 0.6, the UE #2 saves downlink transmission resources of 2 PRBs.

In this embodiment, the value set of the adjustment factor may be predefined or indicated by the network device through high layer signaling. For example, the terminal device receives first configuration information sent by the network device, where the first configuration information is used to indicate a value set of the adjustment factor.

240. And the terminal equipment determines the first TBS according to the resource allocation information, the MCS index and the adjustment factor.

In the embodiment of the present application, the terminal device determines the first TBS according to the resource allocation information, the MCS index, and the adjustment factor in two ways.

Mode 1

The terminal device calculates the first TBS according to the following formula (3) or (4).

Wherein N is_PRBThe number of PRBs allocated for the terminal device by the network device,

or

It is to be understood that Q_mThe MCS table may be looked up according to the MCS index.

If the downlink transmission is performed, the formula (3) is adopted. If the transmission is uplink transmission, the formula (4) is adopted.

That is, in the mode 1, the terminal device directly calculates the first TBS according to the formula (3) or (4).

It is understood that the TBS in equation (3) and equation (4), i.e. the first TBS.

Mode 2

Optionally, the determining, by the terminal device, the first TBS according to the resource allocation information, the MCS, and the adjustment factor includes:

the terminal equipment calculates a second TBS according to the formula (3) or the formula (4);

the terminal equipment selects a first TBS from the TBS set according to the second TBS.

Wherein the TBS set includes at least one TBS.

That is, the terminal device uses the second TBS calculated according to formula (3) or (4) as an initial value, and selects the first TBS from the TBS set according to the initial value.

The first TBS and the second TBS satisfy a first mapping relationship, and the first mapping relationship may be configured by a high-level signaling, which is not limited in this embodiment. For example, the first mapping relationship may be as described in any one of the following:

the first TBS is the value in the TBS set that is closest to the second TBS;

the first TBS is the maximum value in the TBS set that is not greater than the second TBS;

the first TBS is the minimum value in the TBS set that is not less than the second TBS.

Similar to the set of values of the adjustment factor, the TBS set may be predefined or indicated by the network device through higher layer signaling.

In some scenarios, too high flexibility may not be required for TBS determination. If the TBS configured by the network device is higher than the actually required TBS, the reliability of the coding of the system is reduced, which affects the system performance.

For example, the base station transmits to the UEThe URLLC service is transmitted, and the small data packet to be transmitted which is transmitted from the upper layer of the URLLC service has only 256bits (i.e., 32bytes) of TBS. At this time, if the base station decides to schedule L PRBs, it transmits with MCS index N, and the TBS having mapping relation with the TBS in the TBS set is (256+ Z) bits. At this time, the base station firstly complements the 256-bit data packet to (256+ Z) bits by means of zero padding, and then complements the (256+ Z) bits with the code rate

And sending the data.

Conversely, if the TBS flexibility is not so high and the network device is configured with only a TBS of 256bits, then the base station will directly use the code rate

And sending the data. The demodulation performance is rather high.

250. And the terminal equipment receives or transmits a data channel with the network equipment according to the first TBS.

If it is downlink transmission, the terminal device receives the data channel according to the first TBS determined in step 240.

If the transmission is uplink transmission, the terminal device transmits an uplink data channel according to the first TBS determined in step 240.

The method for data transmission provided by the present application is described in detail above with reference to fig. 1 and 2. The terminal device and the network device according to the embodiment of the present application are described below with reference to fig. 3 to 6.

Fig. 3 is a schematic block diagram of a terminal device 500 according to an embodiment of the present application. As shown in fig. 3, the terminal device 500 includes:

a communication unit 510, configured to receive downlink control information from a network device, where the downlink control information includes resource allocation information of a data channel, indication information of a modulation and coding scheme MCS, and indication information of an adjustment factor, where the indication information of the adjustment factor indicates one adjustment factor in a value set of the adjustment factor configured by a high-level signaling, and the adjustment factor is used to determine a first transport block size TBS of the data channel;

a processing unit 520, configured to determine an MCS index from a candidate MCS index set according to the MCS indication information, where the MCS index set includes at least two candidate MCS indexes; determining an adjusting factor from a value set of the adjusting factor according to the indicating information of the adjusting factor; determining a first TBS according to the resource allocation information, the MCS index and the adjustment factor;

a communication unit 510, configured to perform receiving or transmitting of a data channel according to the first TBS.

The communication unit 510 herein may be specifically a transmitting unit when used for data channel transmission. When used for data channel reception, may be a receiving unit.

Each unit and the other operations or functions in the terminal device 500 of the embodiment of the present application are respectively for implementing a corresponding flow executed by the terminal device in the method for transmitting data. For brevity, no further description is provided herein.

Fig. 4 is a schematic block diagram of a network device 600 according to an embodiment of the present application. As shown in fig. 4, the network device 600 includes a processing unit 610 and a communication unit 620. Wherein, the processing unit 610 is configured to control the communication unit 620 to perform the following steps:

sending downlink control information to terminal equipment, wherein the downlink control information comprises resource allocation information of a data channel, indication information of a Modulation and Coding Scheme (MCS) and indication information of an adjustment factor, the indication information of the MCS is used for determining an MCS index from a candidate MCS index set, the indication information of the adjustment factor indicates one adjustment factor in a value set of the adjustment factor configured by a high layer, and the adjustment factor is used for determining a first Transport Block Size (TBS) of the data channel;

and transmitting or receiving a data channel with the terminal equipment according to the determined first TBS.

Fig. 5 is a schematic structural diagram of a terminal device 700 according to an embodiment of the present application. As shown in fig. 5, the terminal device 700 includes: one or more processors 701, one or more memories 702, one or more transceivers 703. The processor 701 is configured to control the transceiver 703 to send and receive signals, the memory 702 is configured to store a computer program, and the processor 701 is configured to call and execute the computer program from the memory 702, so that the terminal device executes the corresponding procedures and/or operations performed by the terminal device in the method embodiment of transmitting data. For brevity, no further description is provided herein.

It should be noted that the terminal device 500 shown in fig. 3 can be implemented by the terminal device 700 shown in fig. 5. For example, the communication unit 510 may be implemented by the transceiver 703 in fig. 5. The processing unit 520 may be implemented by the processor 701, and the like.

Fig. 6 is a schematic structural diagram of a network device 800 according to an embodiment of the present application. As shown in fig. 6, the network device 800 includes: one or more processors 801, one or more memories 802, one or more transceivers 803. The processor 801 is configured to control the transceiver 803 to send and receive signals, the memory 802 is configured to store a computer program, and the processor 801 is configured to call and execute the computer program from the memory 802, so that the network device executes the corresponding procedures and/or operations executed by the network device in the method embodiment of transmitting data. For brevity, no further description is provided herein.

Similarly, the terminal apparatus 600 shown in fig. 4 can be implemented by the terminal apparatus 800 shown in fig. 6. For example, the communication unit 620 in fig. 4 may be implemented by the transceiver 703 in fig. 6.

In the above embodiments, the processor may be a Central Processing Unit (CPU), a microprocessor, an Application-Specific Integrated Circuit (ASIC), or one or more Integrated circuits for controlling the execution of the program in the present Application. For example, a processor may be comprised of a digital signal processor device, a microprocessor device, an analog to digital converter, a digital to analog converter, and so forth. The processor may distribute the control and signal processing functions of the mobile device between these devices according to their respective functions. Further, the processor may include functionality to operate one or more software programs, which may be stored in the memory.

The functions of the processor can be realized by hardware, and can also be realized by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above-described functions.

The Memory may be a Read-Only Memory (ROM) or other type of static storage device that may store static information and instructions, a Random Access Memory (RAM) or other type of dynamic storage device that may store information and instructions. But is not limited to, Electrically Erasable Programmable Read-Only Memory (EEPROM), Compact Disc Read-Only Memory (CD-ROM) or other optical disk storage, optical disk storage (including Compact Disc, laser disk, optical disk, digital versatile disk, blu-ray disk, etc.), magnetic disk storage media or other magnetic storage devices, or 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.

Alternatively, the memory and the storage may be physically separate units, or the memory and the processor may be integrated together.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method of transmitting data, comprising:

the method comprises the steps that terminal equipment receives downlink control information from network equipment, wherein the downlink control information comprises resource allocation information of a data channel, indication information of a Modulation and Coding Scheme (MCS) and indication information of an adjustment factor, the indication information of the adjustment factor indicates one adjustment factor in a value set of the adjustment factor configured by a high-level signaling, and the adjustment factor is used for determining a first Transport Block Size (TBS) of the data channel;

the terminal equipment determines the adjustment factor from the value set of the adjustment factor according to the indication information of the adjustment factor;

the terminal equipment determines an MCS index from a candidate MCS index set according to the indication information of the MCS, wherein the candidate MCS index set comprises at least two candidate MCS indexes;

the terminal equipment determines the first TBS according to the resource allocation information, the MCS index and the adjustment factor;

and the terminal equipment receives or transmits the data channel according to the first TBS.

2. The method of claim 1, further comprising:

the terminal equipment acquires first configuration information, wherein the first configuration information comprises at least two candidate value sets of the adjustment factor;

and the terminal equipment determines the value set of the adjustment factor according to the MCS index, the corresponding relation between at least two candidate MCS indexes in the candidate MCS index set and at least two candidate value sets of the adjustment factor.

3. The method of claim 2, wherein the set of values of the adjustment factor is a subset of a resource pool of adjustment factors, and the resource pool of adjustment factors at least includes 1.

4. The method of any of claims 1-3, wherein the terminal device determining the first TBS based on the resource allocation information, the MCS index, and the adjustment factor comprises:

the terminal device calculates the first TBS according to the following formula:

or

or

5. The method of any of claims 1-3, wherein the terminal device determining the first TBS based on the resource allocation information, the MCS index, and the adjustment factor comprises:

the terminal equipment calculates a second TBS according to the following formula:

or

or

The number of REs used for bearing downlink and uplink data on one PRB in one time slot, v is the number of layers mapped by the data channel, and Q_mIs the modulation order, R is the code rate, eta_DLAnd η_ULThe adjustment factors used for downlink and uplink respectively;

and the terminal equipment selects the first TBS from a TBS set according to the second TBS, wherein the TBS set is predefined or configured through high-layer signaling.

6. The method of claim 5, wherein the first TBS and the second TBS satisfy a first mapping relationship, the first mapping relationship comprising any one of:

the first TBS is a value in the TBS set that is closest to the second TBS;

the first TBS is a maximum value in the TBS set that is not greater than the second TBS;

the first TBS is a minimum value in the TBS set that is not less than the second TBS.

7. A method of transmitting data, comprising:

the method comprises the steps that network equipment sends downlink control information to terminal equipment, wherein the downlink control information comprises resource allocation information of a data channel, indication information of a Modulation and Coding Scheme (MCS) and indication information of an adjustment factor, the indication information of the MCS is used for determining an MCS index from a candidate MCS index set, the candidate MCS index set comprises at least two candidate MCS indexes, the indication information of the adjustment factor indicates one adjustment factor in a value set of the adjustment factor configured by a high layer, and the adjustment factor is used for determining a first Transport Block Size (TBS) of the data channel;

and the network equipment transmits or receives the data channel according to the first TBS.

8. The method of claim 7, further comprising:

the network device sends first configuration information through a high-level signaling, wherein the first configuration information includes at least two candidate value sets of the adjustment factor, and the value set of the adjustment factor is determined according to the MCS index, the corresponding relationship between the at least two candidate MCS indexes in the candidate MCS index set and the at least two candidate value sets of the adjustment factor.

9. The method of claim 8, wherein the set of values of the adjustment factor is a subset of a resource pool of adjustment factors, and the resource pool of adjustment factors at least includes 1.

10. The method according to any of claims 7 to 9, wherein said first TBS is calculated according to the following formula:

or

Wherein N is_PRBIs the netThe number of PRBs allocated by the network device to the terminal device,

or

11. The method according to any of claims 7 to 9, wherein the first TBS is determined according to the following:

the second TBS is calculated according to the following formula:

or

or

selecting the first TBS from a TBS set according to the second TBS, the TBS set being either predefined or configured through higher layer signaling.

12. The method of claim 11, wherein the first TBS and the second TBS satisfy a first mapping relationship, the first mapping relationship comprising any one of:

the first TBS is a value in the TBS set that is closest to the second TBS;

13. A terminal device, comprising:

a transceiver, configured to receive downlink control information from a network device, where the downlink control information includes resource allocation information of a data channel, indication information of a Modulation and Coding Scheme (MCS), and indication information of an adjustment factor, where the indication information of the adjustment factor indicates one adjustment factor in a value set of the adjustment factor configured by a high-level signaling, and the adjustment factor is used to determine a first Transport Block Size (TBS) of the data channel;

the processor is used for determining the adjustment factor from the value set of the adjustment factor according to the indication information of the adjustment factor, and determining an MCS index from a candidate MCS index set according to the indication information of the MCS, wherein the candidate MCS index set comprises at least two candidate MCS indexes;

the processor is further configured to determine the first TBS according to the resource allocation information, the MCS index, and the adjustment factor;

the transceiver is further configured to receive or transmit the data channel according to the first TBS.

14. The terminal device of claim 13, wherein the processor is further configured to:

acquiring first configuration information, wherein the first configuration information comprises at least two candidate value sets of the adjustment factor;

and determining the value set of the adjustment factor according to the MCS index, the corresponding relation between at least two candidate MCS indexes in the candidate MCS index set and at least two candidate value sets of the adjustment factor.

15. The terminal device according to claim 14, wherein the set of values of the adjustment factor is a subset of a resource pool of adjustment factors, and the resource pool of adjustment factors at least includes 1.

16. A terminal device according to any of claims 13 to 15, wherein the processor is configured to calculate the first TBS according to the following formula:

or

or

17. The terminal device of any of claims 13 to 15, the processor being specifically configured to:

the second TBS is calculated according to the following formula:

or

N_PRBThe number of PRBs allocated for the terminal device by the network device,

or

18. The terminal device of claim 17, wherein the first TBS and the second TBS satisfy a first mapping relationship, the first mapping relationship comprising any one of:

the first TBS is a value in the TBS set that is closest to the second TBS;

19. A network device, comprising:

a transceiver, configured to send downlink control information to a terminal device, where the downlink control information includes resource allocation information of a data channel, indication information of a modulation and coding scheme, MCS, and indication information of an adjustment factor, the indication information of the MCS is used to determine an MCS index from a candidate MCS index set, the indication information of the adjustment factor indicates one adjustment factor in a value set of an adjustment factor configured by a higher layer, and the adjustment factor is used to determine a first transport block size, TBS, of the data channel;

the transceiver is further configured to transmit or receive the data channel with the terminal device according to the first TBS.

20. The network device of claim 19, wherein the transceiver is further configured to:

and sending first configuration information to the terminal equipment through a high-level signaling, wherein the first configuration information comprises at least two candidate value sets of the adjustment factor, and the value set of the adjustment factor is determined according to the MCS index, the corresponding relation between at least two candidate MCS indexes in the candidate MCS index sets and the at least two candidate value sets of the adjustment factor.

21. The network device of claim 20, wherein the set of values of the adjustment factor is a subset of a resource pool of adjustment factors, and the resource pool of adjustment factors at least includes 1.

22. The network device of any of claims 19 to 21, wherein the first TBS is calculated according to the following formula:

or

or

23. Network device of any of claims 19 to 21, wherein said first TBS is determined according to:

the second TBS is calculated according to the following formula:

or

or

24. The network device of claim 23, wherein the second TBS and the first TBS satisfy a first mapping relationship, the first mapping relationship comprising any one of:

the first TBS is a value in the TBS set that is closest to the second TBS;