CN111436136B - Authorization-free transmission method and device - Google Patents

Authorization-free transmission method and device Download PDF

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Publication number
CN111436136B
CN111436136B CN201910028868.5A CN201910028868A CN111436136B CN 111436136 B CN111436136 B CN 111436136B CN 201910028868 A CN201910028868 A CN 201910028868A CN 111436136 B CN111436136 B CN 111436136B
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China
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time domain
domain resource
pusch
symbol
dmrs
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CN111436136A (en
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徐修强
陈雁
吕永霞
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to CN201910028868.5A priority Critical patent/CN111436136B/en
Priority to PCT/CN2020/071538 priority patent/WO2020143808A1/en
Publication of CN111436136A publication Critical patent/CN111436136A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation

Abstract

The application provides an authorization-free transmission method and device, relates to the technical field of communication, and is used for avoiding the problem of mutual interference between DMRS (demodulation reference signal) and data in the uplink authorization-free transmission process. The method comprises the following steps: the terminal receives time domain resource configuration and DMRS configuration of the authorization-free transmission, the time domain resource configuration of the authorization-free transmission is used for determining the configured time domain resource, and the DMRS configuration is used for determining the positions of a plurality of OFDM symbols used for bearing the DMRS in the configured time domain resource; the terminal determines the time domain resource of the PUSCH according to the time domain resource configuration of the authorization-free transmission and the DMRS configuration, wherein the time domain resource of the PUSCH is a non-zero subset of the configured time domain resource, and the initial symbol of the time domain resource of the PUSCH is one OFDM symbol of a plurality of OFDM symbols for bearing the DMRS in the configured time domain resource; and the terminal sends the PUSCH on the time domain resource of the PUSCH.

Description

Authorization-free transmission method and device
Technical Field
The present application relates to the field of communications technologies, and in particular, to a method and an apparatus for license-free transmission.
Background
The authorization-free transmission is a data transmission method of 'coming and going', that is, when a terminal needs to transmit data to a base station, the terminal directly uses transmission resources and transmission parameters configured in advance by the base station to transmit data to the base station, without first transmitting a scheduling request to the base station and waiting for a dynamic authorization transmitted by the base station. Compared with the traditional uplink transmission method based on 'request-authorization', the authorization-free transmission has the advantages of reducing signaling overhead, reducing transmission delay, reducing terminal power consumption and the like.
Currently, on the one hand, in order to reduce the latency of a data packet, in one unlicensed transmission period, a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols in a time domain resource of the unlicensed transmission may be used as starting symbols of a time domain resource of a Physical Uplink Shared Channel (PUSCH). On the other hand, in order to improve the utilization rate of the time-frequency resources, the authorization-free transmission supports that a plurality of terminals share the same time-frequency resources. Therefore, on the same time domain resource of the unlicensed transmission, PUSCHs transmitted by different terminals may start from different OFDM symbols, so that an OFDM symbol used for carrying data in one PUSCH and an OFDM symbol used for carrying a demodulation reference signal (DMRS) in another PUSCH are the same OFDM symbol, and thus data transmitted by one terminal and a DMRS transmitted by another terminal interfere with each other, thereby affecting the demodulation performance of the data and the detection performance of the DMRS.
Disclosure of Invention
The application provides an authorization-free transmission method and device, which are used for solving the problem that data sent by one terminal and a DMRS sent by another terminal interfere with each other in an authorization-free transmission process.
In order to achieve the purpose, the technical scheme is as follows:
in a first aspect, a method for unlicensed transmission is provided, including: the terminal receives time domain resource configuration and DMRS configuration of the authorization-free transmission, the time domain resource configuration of the authorization-free transmission is used for determining the configured time domain resource, and the DMRS configuration is used for determining the positions of a plurality of OFDM symbols used for bearing the DMRS in the configured time domain resource; the terminal determines the time domain resource of the PUSCH according to the time domain resource configuration of the authorization-free transmission and the DMRS configuration, wherein the time domain resource of the PUSCH is a non-zero subset of the configured time domain resource, and the initial symbol of the time domain resource of the PUSCH is one OFDM symbol of a plurality of OFDM symbols for bearing the DMRS in the configured time domain resource; and the terminal sends the PUSCH on the time domain resource of the PUSCH.
Based on the above technical solution, in the embodiment of the present application, the starting symbol of the time domain resource of the PUSCH is defined as one OFDM symbol of a plurality of OFDM symbols used for carrying the DMRS in the configured time domain resource, so that the probability of aligning the OFDM symbols used for carrying the DMRS in the PUSCH transmitted by different terminals is increased, and mutual interference between data transmitted by one terminal and the DMRS transmitted by another terminal is avoided.
In one possible design, the starting symbol of the time domain resource of the PUSCH is one of a plurality of OFDM symbols for carrying an additional (additional) DMRS in the configured time domain resource.
In one possible design, a terminal determines a time domain resource of a PUSCH according to a time domain resource configuration of an unlicensed transmission and a DMRS configuration, and includes: in the time slot where the initial symbol is located, determining the OFDM symbol which is located in the same time slot and is located in the configured time domain resource from the first X positions of the initial symbol as the time domain resource of the PUSCH; and X is determined according to the time domain resource configuration of the authorization-free transmission, and is a positive integer.
In one possible design, a terminal determines a time domain resource of a PUSCH according to a time domain resource configuration of an unlicensed transmission and a DMRS configuration, and includes: in the time slot where the initial symbol is located, if less than X-1 OFDM symbols located in the configured time domain resource exist after the initial symbol, determining all the OFDM symbols located in the configured time domain resource from the initial symbol in the time slot as the time domain resource of the PUSCH; wherein, X is determined according to the time domain resource configuration of the authorization-free transmission.
In one possible design, a terminal determines a time domain resource of a PUSCH according to a time domain resource configuration of an unlicensed transmission and a DMRS configuration, and includes: and in the time slot where the starting symbol is positioned, determining a plurality of OFDM symbols which are positioned in the same time slot and positioned in the same authorized transmission free period in the configured time domain resources from the starting symbol as the time domain resources of the PUSCH.
In one possible design, a terminal transmits a PUSCH on a time domain resource of the PUSCH, including: transmitting the DMRS on at least one first symbol in a time domain resource of a PUSCH, wherein the first symbol is a non-zero subset of a plurality of OFDM symbols used for carrying the DMRS in the configured time domain resource; and transmitting data on a second symbol in the time domain resources of the PUSCH, wherein the second symbol is an OFDM symbol except for the at least one first symbol in the time domain resources of the PUSCH. That is to say, under the condition that the PUSCH transmitted by multiple terminals multiplexes time-frequency resources, the technical scheme of the present application can ensure that multiple terminals carry the DMRS in the multiplexed time-frequency resources with the same OFDM symbol, thereby avoiding mutual interference between data transmitted by any one of the multiple terminals and the DMRSs transmitted by other terminals, and ensuring demodulation performance of data transmitted by each terminal.
In one possible design, a terminal transmits a PUSCH on a time domain resource of the PUSCH, including: and if the cut-off symbol of the time domain resource of the PUSCH is the first symbol and is the last OFDM symbol in the time slot in which the starting symbol is positioned, not sending any information on the cut-off symbol, or sending data on the cut-off symbol. Therefore, the overhead of the DMRS can be reduced, and the utilization rate of time domain resources can be improved.
In one possible design, a terminal transmits a DMRS on at least one first symbol in a time domain resource of a PUSCH, comprising: transmitting a first DMRS on a first one of at least one first symbol; transmitting a second DMRS on a non-first one of the at least one first symbol. In this way, the network device can determine which OFDM symbol in the slot is the starting symbol of the time domain resource of the PUSCH, thereby ensuring that the network device can correctly demodulate the PUSCH.
In one possible design, the method further includes: and the terminal receives indication information, wherein the indication information is used for indicating that one OFDM symbol in a plurality of OFDM symbols for carrying DMRS in the configured time domain resources can be used as a starting symbol of the time domain resources of the PUSCH. Therefore, one of a plurality of OFDM symbols used for bearing DMRS in the time domain resources which can be configured by the terminal can be used as the starting symbol of the time domain resources of the PUSCH, thereby reducing the waiting time delay of the data packet.
In one possible design, if the DMRS configuration includes additional DMRS configuration information, one OFDM symbol of the multiple OFDM symbols used for carrying the DMRS in the configured time-domain resource may be used as a starting symbol of the time-domain resource of the PUSCH. Therefore, one of a plurality of OFDM symbols used for bearing DMRS in the time domain resources which can be configured by the terminal can be used as the starting symbol of the time domain resources of the PUSCH, thereby reducing the waiting time delay of the data packet.
In a second aspect, a method for unlicensed transmission is provided, including: a terminal receives time domain resource configuration and DMRS configuration of the authorization-free transmission; the time domain resource configuration of the unlicensed transmission is used for determining the configured time domain resource and the positions of a plurality of third symbols in the configured time domain resource, and the third symbols can be used as initial symbols of the time domain resource of the PUSCH; the DMRS configuration is used to determine a location of a first Resource Element (RE) in the third symbol, and the first RE is used to carry the DMRS. And then, the terminal determines the time domain resource of the PUSCH according to the time domain resource configuration of the authorization-free transmission, wherein the initial symbol of the time domain resource of the PUSCH is one of a plurality of third symbols in the configured time domain resource. And the terminal transmits data on a second RE which is not the first third symbol in the time domain resources of the PUSCH. Wherein, the plurality of third symbols included in the time domain resource of the PUSCH are a non-zero subset of the plurality of third symbols included in the configured time domain resource. The second RE is the other RE except for the first RE in the third symbol.
Based on the above technical solution, since the terminal transmits data on the second RE that is not the first third symbol in the time domain resource of the PUSCH, and does not transmit data on the first RE on the third symbol, the data transmitted by the terminal and the DMRS transmitted by other terminals are frequency-divided, so that the data transmitted by the terminal and the DMRS transmitted by other terminals do not interfere with each other, and the demodulation performance of the data transmitted by the terminal and the demodulation performance of the DMRS transmitted by other terminals are ensured.
In one possible design, the method further includes: and the terminal transmits the DMRS on the first RE of the first third symbol in the time domain resources of the PUSCH.
In one possible design, the method further includes: and the terminal sends data on a fourth symbol in the time domain resource of the PUSCH, wherein the fourth symbol is other OFDM symbols except the third symbol in the time domain resource of the PUSCH.
In a third aspect, a method for unlicensed transmission is provided, including: the terminal receives time domain resource configuration of the authorization-free transmission and DMRS configuration, wherein the time domain resource configuration of the authorization-free transmission is used for determining the positions of a plurality of transmission occasions in the configured time domain resource, the DMRS configuration is used for determining the positions of a plurality of first transmission occasions in the plurality of transmission occasions, and the first transmission occasions are used for bearing PUSCHs carrying the DMRS. And then, the terminal determines an initial transmission opportunity according to the time domain resource configuration of the authorization-free transmission and the DMRS configuration, wherein the initial transmission opportunity is one of the first transmission opportunities. And the terminal sends the PUSCH at the initial transmission opportunity.
Based on the above technical solution, the terminal selects one of the first transmission occasions as an initial transmission occasion. In this way, since the PUSCH transmitted by the other terminal at the first transmission timing also carries the DMRS, the terminal transmits the PUSCH at the initial transmission timing, and the DMRS carried by the PUSCH does not affect data transmitted by the other terminal, thereby preventing the DMRS transmitted by one terminal and data transmitted by another terminal from interfering with each other.
In one possible design, a terminal sends a PUSCH at an initial transmission opportunity, including: the terminal repeatedly transmits the PUSCH at K transmission occasions from the initial transmission occasion.
Optionally, the value of K is equal to the configured number of repeated transmissions. Or the value of K is less than the configured repeated transmission times, and the value of K is the number of all transmission opportunities from the initial transmission opportunity in the authorization-free transmission period in which the initial transmission opportunity is located.
In a fourth aspect, a communication apparatus is provided, including: the receiving module is used for receiving time domain resource configuration and DMRS configuration of the unlicensed transmission, the time domain resource configuration of the unlicensed transmission is used for determining the configured time domain resource, and the DMRS configuration is used for determining the positions of a plurality of OFDM symbols used for bearing the DMRS in the configured time domain resource. And the processing module is used for determining the time domain resource of the PUSCH according to the time domain resource configuration of the authorization-free transmission and the DMRS configuration, wherein the time domain resource of the PUSCH is a non-zero subset of the configured time domain resource, and the initial symbol of the time domain resource of the PUSCH is one OFDM symbol of a plurality of OFDM symbols for bearing the DMRS in the configured time domain resource. And the sending module is used for sending the PUSCH on the time domain resource of the PUSCH.
In one possible design, a starting symbol of a time domain resource of the PUSCH is one OFDM symbol of a plurality of OFDM symbols for carrying DMRSs in a configured time domain resource, and the method includes: the starting symbol of the time domain resource of the PUSCH is one OFDM symbol of a plurality of OFDM symbols used for bearing the additional DMRS in the configured time domain resource.
In one possible design, the processing module is configured to determine the time domain resource of the PUSCH according to the time domain resource configuration of the unlicensed transmission and the DMRS configuration, and includes: in the time slot where the initial symbol is located, determining the OFDM symbol which is located in the same time slot and is located in the configured time domain resource from the first X positions of the initial symbol as the time domain resource of the PUSCH; and X is determined according to the time domain resource configuration of the authorization-free transmission, and is a positive integer.
In one possible design, the processing module is configured to determine the time domain resource of the PUSCH according to the time domain resource configuration of the unlicensed transmission and the DMRS configuration, and includes: in the time slot where the initial symbol is located, if less than X-1 OFDM symbols located in the configured time domain resource exist after the initial symbol, determining all the OFDM symbols located in the configured time domain resource from the initial symbol in the time slot as the time domain resource of the PUSCH; and X is determined according to the time domain resource configuration of the authorization-free transmission, and is a positive integer.
In one possible design, the processing module is configured to determine the time domain resource of the PUSCH according to the time domain resource configuration of the unlicensed transmission and the DMRS configuration, and includes: and in the time slot where the starting symbol is positioned, determining a plurality of OFDM symbols which are positioned in the same time slot and positioned in the same authorized transmission free period in the configured time domain resources from the starting symbol as the time domain resources of the PUSCH.
In one possible design, a transmitting module for transmitting a PUSCH on a time domain resource of the PUSCH includes: transmitting the DMRS on at least one first symbol in a time domain resource of a PUSCH, wherein the first symbol is a non-zero subset of a plurality of OFDM symbols used for carrying the DMRS in the configured time domain resource; and transmitting data on a second symbol in the time domain resources of the PUSCH, wherein the second symbol is an OFDM symbol except for the at least one first symbol in the time domain resources of the PUSCH.
In one possible design, a transmitting module for transmitting a PUSCH on a time domain resource of the PUSCH includes: and if the cut-off symbol of the time domain resource of the PUSCH is the first symbol and is the last OFDM symbol in the time slot in which the starting symbol is positioned, not sending any information on the cut-off symbol, or sending data on the cut-off symbol.
In one possible design, a transmitting module for transmitting a DMRS on at least one first symbol in a time domain resource of a PUSCH includes: transmitting a first DMRS on a first one of at least one first symbol; transmitting a second DMRS on a non-first one of the at least one first symbol.
In one possible design, the receiving module is further configured to receive indication information, where the indication information is used to indicate that one OFDM symbol of the multiple OFDM symbols for carrying the DMRS in the configured time domain resource may be used as a starting symbol of the time domain resource of the PUSCH.
In one possible design, if the DMRS configuration includes additional DMRS configuration information, one OFDM symbol of the multiple OFDM symbols used for carrying the DMRS in the configured time-domain resource may be used as a starting symbol of the time-domain resource of the PUSCH.
In a fifth aspect, a communication apparatus is provided, including: the receiving module is used for receiving time domain resource configuration and DMRS configuration of the authorization-free transmission; the time domain resource configuration of the unlicensed transmission is used for determining the configured time domain resource and the positions of a plurality of third symbols in the configured time domain resource, and the third symbols can be used as initial symbols of the time domain resource of the PUSCH; the DMRS configuration is used to determine a location of a first Resource Element (RE) in the third symbol, and the first RE is used to carry the DMRS. And the processing module is used for determining the time domain resource of the PUSCH according to the time domain resource configuration of the authorization-free transmission, wherein the starting symbol of the time domain resource of the PUSCH is one of a plurality of third symbols in the configured time domain resource. A transmitting module, configured to transmit data on a second RE, which is not a first third symbol, in the time domain resource of the PUSCH. Wherein, the plurality of third symbols included in the time domain resource of the PUSCH are a non-zero subset of the plurality of third symbols included in the configured time domain resource. The second RE is the other RE except for the first RE in the third symbol.
In one possible design, the transmitting module is further configured to transmit, by the terminal, the DMRS on the first RE of the first third symbol in the time domain resource of the PUSCH.
In one possible design, the sending module is further configured to send data on a fourth symbol in the time domain resource of the PUSCH, where the fourth symbol is an OFDM symbol other than the third symbol in the time domain resource of the PUSCH.
In a sixth aspect, a communication apparatus is provided, including: a receiving module, configured to receive a time domain resource configuration for unlicensed transmission and a DMRS configuration, where the time domain resource configuration for unlicensed transmission is used to determine positions of multiple transmission occasions in the configured time domain resource, and the DMRS configuration is used to determine positions of multiple first transmission occasions in the multiple transmission occasions. And the processing module is used for determining an initial transmission opportunity according to the time domain resource configuration of the authorization-free transmission and the DMRS configuration, wherein the initial transmission opportunity is one of the first transmission opportunities. And the sending module is used for sending the PUSCH at the initial transmission opportunity.
In one possible design, a transmitting module for transmitting a PUSCH at an initial transmission opportunity includes: the PUSCH is repeatedly transmitted at K transmission occasions from the initial transmission occasion.
Optionally, the value of K is equal to the configured number of repeated transmissions. Or the value of K is less than the configured repeated transmission times, and the value of K is the number of all transmission opportunities from the initial transmission opportunity in the authorization-free transmission period in which the initial transmission opportunity is located.
In a seventh aspect, a communication apparatus is provided, including: a processor, configured to couple with the memory, read the instructions in the memory, and implement the method for license-exempt transmission according to the instructions as described in the first to third aspects.
In an eighth aspect, a computer-readable storage medium is provided, which stores instructions that, when executed on a communication device, enable the communication device to perform the method for license-exempt transmission described in the first to third aspects.
In a ninth aspect, there is provided a computer program product comprising instructions which, when run on a communication device, causes the communication device to perform the method of unlicensed transmission of the first to third aspects described above.
A tenth aspect provides a chip, which includes a processing module and a communication interface, wherein the communication interface is configured to receive an input signal and provide the signal to the processing module, and/or output a signal generated by the processing module, and the processing module is configured to execute the method for unlicensed transmission according to any one of the first to third aspects above to generate the PUSCH. In an embodiment, the processing module may execute the code instructions to perform the method for unlicensed transmission described in any of the first to third aspects above to generate the PUSCH. The code instructions may come from memory internal to the chip or from memory external to the chip. Alternatively, the processing module may be a processor or a microprocessor or an integrated circuit integrated on the chip. The communication interface may be an input-output circuit or a transceiver pin on a chip.
The technical effects brought by any one of the design manners of the fourth aspect to the tenth aspect may refer to the beneficial effects of the corresponding methods provided above and the technical effects brought by the design manners, and are not described herein again.
Drawings
Fig. 1 is a schematic view of a flexible initial scenario provided by an embodiment of the present application;
fig. 2 is a schematic architecture diagram of a communication system according to an embodiment of the present application;
fig. 3 is a schematic hardware structure diagram of a terminal according to an embodiment of the present disclosure;
fig. 4 is a flowchart of a method for unlicensed transmission according to an embodiment of the present application;
fig. 5 is a first schematic diagram of a configured time domain resource according to an embodiment of the present application;
fig. 6 is a schematic diagram of a configured time domain resource according to an embodiment of the present application;
fig. 7 is a schematic diagram three of a configured time domain resource according to an embodiment of the present application;
fig. 8 is a fourth schematic diagram of a configured time domain resource according to an embodiment of the present application;
fig. 9 is a fifth schematic diagram of a configured time domain resource according to an embodiment of the present application;
fig. 10 is a sixth schematic diagram of a configured time domain resource provided in an embodiment of the present application;
fig. 11 is a seventh schematic diagram of a configured time domain resource according to an embodiment of the present application;
fig. 12 is an eighth schematic diagram of a configured time domain resource according to an embodiment of the present application;
fig. 13 is a nine schematic diagram of a configured time domain resource according to an embodiment of the present application;
fig. 14 is a schematic diagram ten of a configured time domain resource provided in an embodiment of the present application;
fig. 15 is a flowchart of another method for unlicensed transmission according to an embodiment of the present application;
fig. 16 is an eleventh schematic diagram of a configured time domain resource provided in an embodiment of the present application;
fig. 17 is a twelve schematic diagram of a configured time domain resource according to an embodiment of the present application;
fig. 18 is a schematic diagram thirteen illustrating a configured time domain resource according to an embodiment of the present application;
fig. 19 is a flowchart of another method for unlicensed transmission according to an embodiment of the present application;
fig. 20 is a fourteen time domain diagram of a configured time domain resource according to an embodiment of the present application;
fig. 21 is a schematic structural diagram of a communication device according to an embodiment of the present application.
Detailed Description
In order to facilitate understanding of the technical solutions of the present application, some terms related to the embodiments of the present application are briefly described below.
1. Time slot
In NR, 1 slot contains 14 OFDM symbols for a normal (normal) Cyclic Prefix (CP). For extended CP, 1 slot contains 12 OFDM symbols.
For convenience of description, in the embodiment of the present application, if not specifically described, 1 slot includes 14 OFDM symbols. The symbol is an OFDM symbol, for example, the starting symbol is the first OFDM symbol in the PUSCH, and the ending symbol is the last OFDM symbol in the PUSCH.
In the slot, 14 OFDM symbols are numbered in descending order, the smallest number is 0, and the largest number is 13. That is, one slot includes OFDM symbol #0 to OFDM symbol # 13.
2. License-free transmission
The license-free transmission means: the uplink transmission of the terminal does not need to be completed by scheduling of the network equipment. Specifically, when uplink data arrives, the terminal does not need to send a Scheduling Request (SR) to the network device and wait for a dynamic grant (dynamic grant) of the network device, but may directly send the uplink data to the network device using a transmission resource pre-allocated by the network device and a specified transmission parameter.
The unlicensed transmission is divided into two categories: PUSCH transmission based on a first type of configuration grant (type 1 PUSCH transmission with a configured grant, or type 1 configured grant PUSCH transmission), and PUSCH transmission based on a second type of configuration grant (type 2 PUSCH transmission with a configured grant, or type 2 configured grant configuration, or type 2 configured grant PUSCH transmission).
A configuration mode of PUSCH transmission based on first type configuration authorization: the network device configures all transmission resources and transmission parameters for the terminal through higher layer parameters (e.g. ConfiguredGrantConfig), such as: a period of a time domain Resource, an open loop power control related parameter, a waveform, a redundancy version sequence, a repetition number, a frequency hopping pattern, a Resource allocation type, a hybrid automatic repeat request (HARQ) process number, a DMRS related parameter, a Modulation and Coding Scheme (MCS) table, a Resource Block Group (RBG) size, and all transmission resources and transmission parameters including a time domain Resource, a frequency domain Resource, and an MCS.
The configuration mode of PUSCH transmission based on the second type of configuration authorization comprises the following two steps: first, the network device configures part of the transmission resources and transmission parameters to the terminal through higher layer parameters (e.g. ConfiguredGrantConfig), such as: the method comprises the steps of (1) time domain resource period, open loop power control related parameters, waveforms, redundancy version sequences, repetition times, frequency hopping modes, resource allocation types, HARQ (hybrid automatic repeat request) process numbers, DMRS (demodulation reference signal) related parameters, a modulation and coding strategy table and RBG (radial basis group) size; then, the network device sends Downlink Control Information (DCI) (e.g., configuration-specific DCI) to the terminal, so that the terminal activates PUSCH transmission authorized based on the second type of configuration and simultaneously configures transmission resources and transmission parameters including time domain resources, frequency domain resources, DMRS related parameters, MCS, and the like. It should be noted that the PUSCH transmission of the second type configuration grant can be used after being activated.
In an embodiment, specific configuration parameters of the PUSCH transmission with the first type of configuration grant and the PUSCH transmission with the second type of configuration grant may refer to related descriptions in the Technical Specification (TS) 38.331 of the third generation partnership project (3 GPP).
3. Flexible initiation
Flexible initiatives are one concept defined by embodiments of the present application. If the terminal is enabled to flexibly start, in one unlicensed transmission period, a plurality of OFDM symbols in the time domain resource of unlicensed transmission may be used as starting symbols of the time domain resource of the PUSCH. And if the terminal is not enabled to flexibly start, in an authorization-free transmission period, taking the first OFDM symbol in the time domain resource of the authorization-free transmission as the starting symbol of the time domain resource of the PUSCH.
It can be understood that, in the case that the terminal is enabled to flexibly start, if the arrival time of the data packet of the terminal misses the first OFDM symbol of the time domain resource for unlicensed transmission in the current period of unlicensed transmission, the data packet of the terminal does not need to wait for the first OFDM symbol of the time domain resource for unlicensed transmission in the next period of unlicensed transmission, but may start to transmit the data on other OFDM symbols of the time domain resource for unlicensed transmission in the current period of unlicensed transmission.
Taking fig. 1 as an example, it is assumed that in the period 1 of unlicensed transmission, the time domain resource for unlicensed transmission includes OFDM symbol #2 to OFDM symbol #9 in slot 1. In period 2, the time domain resource of the unlicensed transmission includes OFDM symbol #10 to OFDM symbol #13 in slot 1, and OFDM symbol #0 to OFDM symbol #3 in slot 2. In the case where flexible start is enabled by the terminal, OFDM symbol #2, OFDM symbol #4, and OFDM symbol #7 in the unlicensed transmission period 1 may serve as starting symbols of the time domain resource of the PUSCH. If a data packet for a terminal arrives at OFDM symbol #4, the terminal may start transmitting the data packet at OFDM symbol #5 instead of waiting for the data packet to be transmitted until OFDM symbol # 10. In this way, the latency of the data packet is reduced from 6 OFDM symbols to 1 OFDM symbol. Therefore, the terminal can start flexibly, and the waiting time delay of the data packet can be effectively reduced.
4、DMRS
DMRS is used to implement demodulation of PUSCH. The DMRS is carried on a part of OFDM symbols in the PUSCH. In addition, the network device configures the PUSCH to carry a forward-located (Front-load) DMRS with an OFDM symbol located at a Front position, so that the network device can perform operations such as user detection and channel estimation as soon as possible, thereby reducing a demodulation delay.
The Front-load DMRSs may be classified into two types according to Mapping Type (Mapping Type) of the PUSCH, i.e., Mapping Type a and Mapping Type B.
Wherein, for Mapping Type a, the Front-load DMRS is located in the third OFDM symbol in the slot, or in the third OFDM symbol and the fourth OFDM symbol in the slot.
For Mapping Type B, the Front-load DMRS is located at the first OFDM symbol in PUSCH, or the first OFDM symbol and the second OFDM symbol in PUSCH. For example, if the time domain resource of the PUSCH includes OFDM symbol #5 to OFDM symbol #12 in the slot, the Front-load DMRS is located in OFDM symbol #5 in the slot, or OFDM symbol #5 and OFDM symbol #6 in the slot.
The Front-load DMRS may support multiple orthogonal DMRS ports by means of comb frequency division, time domain code division, frequency domain code division, Cyclic Shift (CS), and the like, for example, up to 4, 8, 6, or 12 orthogonal DMRS ports may be supported in the 3GPP R15 protocol. It will be appreciated that for multiple terminals sharing the same time-frequency resource, the network device may configure orthogonal DMRSs for the terminals (e.g., configure different orthogonal DMRS ports), such that the network device identifies the different terminals by detecting the DMRSs.
In addition, in order to support a high-speed scene, Additional DMRSs may be configured on the basis of the Front-load DMRSs. The Additional DMRS is generated in the same way as the Front-load DMRS. The Additional DMRSs are generally located after the Front-load DMRSs, and may be used to improve the performance of channel estimation. For example, in R15, when the Front-load DMRS is a single symbol, 1-3 Additional DMRSs may be configured; when the Front-load DMRS is two symbols, an Additional DMRS of 2 symbols may be configured. The Additional DMRS is specifically located on which symbols of the slot or PUSCH, and may be configured by the network equipment or agreed by the protocol.
5. Transmission Opportunity (TO)
The transmission opportunity is a time domain resource for transmitting the PUSCH once. One transmission opportunity includes a plurality of OFDM symbols.
The authorization-free transmission supports repeated transmission, and the network equipment can configure repeated transmission times for the terminal through high-level signaling. Taking the number of repeated transmissions as K as an example, the terminal may repeatedly send the PUSCH K times at K transmission occasions. Among them, one PUSCH out of the K PUSCHs may be referred to as one repetition (repetition). K is a positive integer.
6. Period of license-free transmission
The unlicensed transmission period is used for representing the rule that the unlicensed transmission time domain resource repeatedly appears in the time domain. The time length of the unlicensed transmission period is in units of OFDM symbols or slots. The time length of one unlicensed transmission period refers to the number of OFDM symbols included in one unlicensed transmission period or the number of slots included in one unlicensed transmission period.
The unlicensed transmission period may include one or more transmission opportunities. Taking the example that an unlicensed transmission period includes one transmission opportunity, an unlicensed transmission period includes OFDM symbols between the first OFDM symbol (including the OFDM symbol) in one transmission opportunity to the first OFDM symbol (not including the OFDM symbol) of the next transmission opportunity. For example, transmission opportunity #1 includes OFDM symbol #3 to OFDM symbol #10 in slot 1, transmission opportunity #2 includes OFDM symbol #2 to OFDM symbol #9 in slot 2, and one unlicensed transmission period includes 13 OFDM symbols, and the unlicensed transmission period in which transmission opportunity #1 is located includes OFDM symbol #3 to OFDM symbol #13 in slot 1, and OFDM symbol #0 to OFDM symbol #1 in slot 2.
Optionally, the unlicensed transmission time domain resource in one unlicensed transmission period specifically refers to a time domain resource of one or more transmission occasions included in the unlicensed transmission period.
7. Time domain resource allocation for license-free transmission
At present, the network device configures up to 16 combinations for the terminal through RRC signaling, and one of the combinations is used by a set of time domain resources for unlicensed transmission. Each combination includes the following parameter configurations: PUSCH mapping type, K2Start and Length Indicator Value (SLIV).
And the PUSCH mapping type is mapping type A or mapping type B. K2The offset used for configuring the time slot where the PUSCH is located compared with the time slot where the DCI for scheduling the PUSCH is located, for example, if the time slot where the DCI for scheduling the PUSCH is located is n, the time slot for PUSCH transmission is n + K2. The starting symbol S and length L used by the SLIV to configure the PUSCH satisfy the definitions as in table 1 below.
TABLE 1
Figure BDA0001943476120000081
If the network device does not configure any combination through RRC signaling, the terminal uses the default 16 combinations as shown in table 2 below. The value of j in table 2 is 1, 2 or 3.
TABLE 2
Figure BDA0001943476120000082
Figure BDA0001943476120000091
On the basis that the terminal knows 16 combinations configured or default through RRC signaling, the network device indicates one of the 16 combinations to the terminal through RRC signaling (e.g., time domain resource allocation (timdomainallocation) parameter in RRC signaling) for Type 1 configured grant (i.e., PUSCH transmission authorized based on the first Type configuration), and since the Type 1 configured grant has a special RRC parameter (e.g., timeDomainOffset), the terminal determines the starting slot of the unlicensed transmission resource according to the timeDomainOffset, for example, when the value indicated by the timeDomainOffset is 100, the terminal determines that the unlicensed transmission resource starts from slot # 100. Thus, for a Type 1 configured grant, the terminal does not use K in the combination2. For Type 2 configured grant (i.e. PUSCH transmission based on the second Type configuration grant), the network device indicates one of 16 combinations to the terminal through DCI (e.g. Time domain resource allocation (Time domain resource allocation) field in DCI), in which case the terminal indicates one of the 16 combinations according to K in the combination2A starting time slot of the unlicensed transmission resources is determined. Specifically, the terminal determines that the unlicensed transmission resource starts from timeslot # (n + K)2) And n is a slot index of the DCI received by the terminal.
For example, assuming that slot 1 is the starting slot, if the network device indicates S-0 and L-8 to the terminal through the SLIV, as shown in fig. 5, the transmission opportunity starts from OFDM symbol #0 of slot 1 and ends at OFDM symbol #8 of slot 1.
The time domain resource configuration of the unlicensed transmission further includes a configuration parameter of the unlicensed transmission period (e.g., a period parameter in a configuredtransonfiguration information element (information element) in RRC signaling), where the configuration parameter of the unlicensed transmission period is used to indicate a time length of one unlicensed transmission period.
For example, as illustrated in fig. 5, it is assumed that the configuration parameter of the unlicensed transmission period indicates that the time length of the unlicensed transmission period is 10 OFDM symbols, and the unlicensed transmission period 1 includes OFDM symbols #0 to #9 in the slot 1; the unlicensed transmission period 2 includes OFDM symbol #10 to OFDM symbol #13 in slot 1, and OFDM symbol #0 to OFDM symbol #5 in slot 2.
In the description of this application, "/" means "or" unless otherwise stated, for example, A/B may mean A or B. "and/or" herein is merely an association describing an associated object, and means that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. Further, "at least one" means one or more, "a plurality" means two or more. The terms "first", "second", and the like do not necessarily limit the number and execution order, and the terms "first", "second", and the like do not necessarily limit the difference.
It is noted that, in the present application, words such as "exemplary" or "for example" are used to mean exemplary, illustrative, or descriptive. Any embodiment or design described herein as "exemplary" or "e.g.," is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.
In addition, 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 constitute a limitation to the technical solution provided in the embodiment of the present application, and it can be known by a person skilled in the art that the technical solution provided in the embodiment of the present application is also applicable to similar technical problems 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 may be applied to various communication systems, for example, a Long Term Evolution (LTE) communication system, a New Radio (NR) communication system using a fifth generation (5th generation, 5G) communication technology, a future Evolution system, or a multiple communication convergence system, and the like. The technical scheme provided by the application can be applied to various application scenarios, for example, scenarios such as machine-to-machine (M2M), macro-micro communication, enhanced mobile internet (eMBB), ultra-reliable and ultra-low latency communication (urlcc), and mass internet of things communication (mtc). These scenarios may include, but are not limited to: communication scenarios between communication devices, network devices, communication scenarios between network devices and communication devices, etc. The following description is given by way of example as applied to a communication scenario between a network device and a terminal.
Fig. 2 is a schematic diagram of a communication system to which the technical solution provided by the present application is applicable, where the communication system may include one or more network devices (only 1 is shown in fig. 2) and one or more terminals (only one is shown in fig. 2) connected to each network device. Fig. 2 is a schematic diagram, and does not limit the application scenarios of the technical solutions provided in the present application.
The network device may be a base station or base station controller for wireless communication, etc. For example, the base station may include various types of base stations, such as: a micro base station (also referred to as a small station), a macro base station, a relay station, an access point, and the like, which are not specifically limited in this embodiment of the present application. In this embodiment, the base station may be a base station (BTS) in a global system for mobile communication (GSM), a Code Division Multiple Access (CDMA), a base station (node B) in a Wideband Code Division Multiple Access (WCDMA), an evolved base station (evolved node B, eNB or e-NodeB) in LTE, an internet of things (IoT) or an eNB in a narrowband internet of things (NB-IoT), a future 5G mobile communication network or a base station in a future evolved Public Land Mobile Network (PLMN), which is not limited in this embodiment.
Terminals are used to provide voice and/or data connectivity services to users. The terminal may be referred to by different names, such as User Equipment (UE), access terminal, terminal unit, terminal station, mobile station, remote terminal, mobile device, wireless communication device, terminal agent, or terminal device. Optionally, the terminal may be various handheld devices, vehicle-mounted devices, wearable devices, and computers with communication functions, which is not limited in this embodiment of the present application. For example, the handheld device may be a smartphone. The in-vehicle device may be an in-vehicle navigation system. The wearable device may be a smart band, or a Virtual Reality (VR) device. The computer may be a Personal Digital Assistant (PDA) computer, a tablet computer, and a laptop computer.
The network device or terminal in fig. 2 may be implemented by the communication apparatus in fig. 3. As shown in fig. 3, the communication apparatus includes: at least one processor 101, a communication link 102, a memory 103, and at least one communication interface 104.
The processor 101 may be a general-purpose Central Processing Unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more ics for controlling the execution of programs in accordance with the present disclosure.
The communication link 102 may include a path for transmitting information between the aforementioned components.
The communication interface 104 may be any device, such as a transceiver, for communicating with other devices or communication networks, such as ethernet, RAN, Wireless Local Area Networks (WLAN), etc.
The memory 103 may be, but is not limited to, 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, an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disk storage, optical disk storage (including compact disc, laser disc, optical disc, digital versatile disc, blu-ray disc, 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. The memory may be separate and coupled to the processor via communication line 102. The memory may also be integral to the processor. The memory provided by the embodiment of the application can be generally nonvolatile. The memory 103 is used for storing computer-executable instructions for executing the scheme of the application, and is controlled by the processor 101 to execute. The processor 101 is configured to execute computer-executable instructions stored in the memory 103, thereby implementing the methods provided by the embodiments described below in the present application.
Optionally, the computer-executable instructions in the embodiments of the present application may also be referred to as application program codes, which are not specifically limited in the embodiments of the present application.
In particular implementations, processor 101 may include one or more CPUs such as CPU0 and CPU1 in fig. 3, for example, as an example.
In particular implementations, the communication device may include multiple processors, such as processor 101 and processor 107 in fig. 3, as one embodiment. Each of these processors may be a single-core (single-CPU) processor or a multi-core (multi-CPU) processor. A processor herein may refer to one or more devices, circuits, and/or processing cores for processing data (e.g., computer program instructions).
In a specific implementation, the communication apparatus may further include an output device 105 and an input device 106, as an embodiment. The output device 105 is in communication with the processor 101 and may display information in a variety of ways. For example, the output device 105 may be a Liquid Crystal Display (LCD), a Light Emitting Diode (LED) display device, a Cathode Ray Tube (CRT) display device, a projector (projector), or the like. The input device 106 is in communication with the processor 101 and may receive user input in a variety of ways. For example, the input device 106 may be a mouse, a keyboard, a touch screen device, or a sensing device, among others.
The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.
As shown in fig. 4, a method for unlicensed transmission provided for an embodiment of the present application includes the following steps:
s101, the terminal receives time domain resource configuration and DMRS configuration of the license-exempt transmission.
Wherein the time domain resource configuration of the license-exempt transmission is used for determining the configured time domain resource. It is to be understood that the configured time domain resource includes an unlicensed transmission time-frequency resource in a plurality of unlicensed transmission periods.
For the time domain resource allocation of the grant-free transmission, reference may be made to the foregoing description, and details are not repeated here.
Illustratively, as shown in fig. 5, the unlicensed transmission period 1 includes OFDM symbol #0 to OFDM symbol #9 in slot 1. The time domain resource for unlicensed transmission in the unlicensed transmission period 1 includes OFDM symbol #0 to OFDM symbol #7 in slot 1. The unlicensed transmission period 2 includes OFDM symbol #10 to OFDM symbol #13 in slot 1, and OFDM symbol #0 to OFDM symbol #5 in slot 2. The time domain resource for the unlicensed transmission in the period 2 includes OFDM symbol #10 to OFDM symbol #13 in slot 1 and OFDM symbol #0 to OFDM symbol #3 in slot 2. Therefore, OFDM symbol #0 to OFDM symbol #7 in slot 1, OFDM symbol #10 to OFDM symbol #13 in slot 1, and OFDM symbol #0 to OFDM symbol #3 in slot 2 all belong to the allocated time domain resource. The DMRS configuration is used for determining the positions of a plurality of OFDM symbols used for carrying the DMRS in the configured time domain resources. Wherein the DMRS configuration comprises Front-loaded DMRS configuration information. The Front-loaded DMRS configuration information is used to determine the number of symbols for the Front-loaded DMRS (i.e., whether the Front-loaded DMRS is single-symbol or two-symbol). Optionally, the DMRS configuration may further include Additional DMRS configuration information, where the Additional DMRS configuration information is used to determine the number of symbols of the Additional DMRS and a position of the Additional DMRS on a time-domain resource of the PUSCH. Optionally, the DMRS configuration further includes the following parameters: DMRS port number, DMRS type, etc.
It should be noted that the position of the Front-loaded DMRS in the time domain is determined by the mapping type of the PUSCH, and the mapping type of the PUSCH is determined according to the time domain resource configuration of the grant-free transmission.
Illustratively, in addition to fig. 5, as shown in fig. 6, the configured time domain resources at least include OFDM symbols #0 to #7 in slot 1, OFDM symbols #10 to #13 in slot 1, and OFDM symbols #0 to #3 in slot 2. Assuming that the time domain resource configuration of the unlicensed transmission indicates that mapping type is mapping type B, the number of symbols of Front-loaded DMRS is indicated by Front-loaded DMRS configuration information in DMRS configuration to be 1, so that for a period 1 of unlicensed transmission, an OFDM symbol #0 in a time slot 1 is used for carrying the Front-loaded DMRS; for grant-free transmission period 2, OFDM symbol #10 in slot 1 is used to carry the Front-loaded DMRS. Optionally, the Additional DMRS configuration information in the DMRS configuration is used to indicate that the number of the Additional DMRS symbols is 2, and the Additional DMRS is located in a 4 th OFDM symbol and a 7 th OFDM symbol of a time domain resource of a PUSCH, so that for the grant-free transmission period 1, an OFDM symbol #3 and an OFDM symbol #6 in the slot 1 are used to carry the Additional DMRS; for the unlicensed transmission period 1, OFDM symbol #13 in slot 1 and OFDM symbol #2 in slot 2 are both used to carry the Additional DMRS.
In summary, based on the example shown in fig. 6, for the configured time domain resources, OFDM symbol #0, OFDM symbol #3, OFDM symbol #6, OFDM symbol #10, and OFDM symbol #13 in slot 1 are all OFDM symbols for carrying DMRSs, and OFDM symbol #2 in slot 2 is all OFDM symbols for carrying DMRSs.
As an implementation manner, if the unlicensed transmission is PUSCH transmission authorized based on the first type of configuration, the terminal obtains the time domain resource configuration and DMRS configuration of the unlicensed transmission by receiving a higher-layer parameter sent by the network device. And if the authorization-free transmission is the PUSCH transmission authorized based on the second type of configuration, the terminal acquires the time domain resource configuration and the DMRS configuration of the authorization-free transmission by receiving the high-level parameters and the DCI sent by the network equipment.
S102, the terminal determines the time domain resource of the PUSCH according to the time domain resource configuration of the authorization-free transmission and the DMRS configuration.
Wherein, the starting symbol of the time domain resource of the PUSCH is one of a plurality of OFDM symbols used for bearing DMRS in the configured time domain resource.
Optionally, in a case that the PUSCH cannot be transmitted across slots, the terminal does not use the last OFDM symbol in the slot as the starting symbol of the time domain resource of the PUSCH.
As illustrated in fig. 7, the configured time domain resource includes OFDM symbol #2 to OFDM symbol #13 in slot 1. In slot 1, OFDM symbol #2, OFDM symbol #5, OFDM symbol #8, OFDM symbol #10, and OFDM symbol #13 are all OFDM symbols used for carrying DMRS in the configured time domain resource. In this case, OFDM symbol #2, OFDM symbol #5, OFDM symbol #8, and OFDM symbol #10 may be all starting symbols of the time domain resource of the PUSCH. It can be understood that the specific selection of which OFDM symbol of the plurality of OFDM symbols for carrying DMRS in the configured time domain resources is used as the starting symbol of the time domain resource of PUSCH by the terminal device may be determined by the requirements of the terminal. For example, in slot 1, data to be transmitted by the terminal arrives at OFDM symbol #4, and the terminal may select OFDM symbol #5 as a starting symbol of a time domain resource of the PUSCH, so as to transmit the data as soon as possible and reduce the transmission delay of the data.
Optionally, the starting symbol of the time domain resource of the PUSCH is one of a plurality of OFDM symbols used for carrying an additional DMRS in the configured time domain resource.
For example, referring to fig. 7, OFDM symbol #5, OFDM symbol #8, and OFDM symbol #13 in slot 1 are OFDM symbols used for carrying additional DMRSs in configured time domain resources. In this case, OFDM symbol #5 and OFDM symbol #8 may both be the starting symbol of the time domain resource of the PUSCH.
Optionally, if the DMRS configuration indicates that a front-load DMRS is a dual symbol, the starting symbol of the time domain resource of the PUSCH is a first OFDM symbol in a group of OFDM symbols in multiple groups of OFDM symbols in the configured time domain resource, and each group of OFDM symbols includes two consecutive OFDM symbols for carrying the DMRS.
As illustrated in fig. 8, for the time slot 1, the OFDM symbols included in the configured time domain resource are OFDM symbol #2 to OFDM symbol # 13. The OFDM symbol #2, the OFDM symbol #3, the OFDM symbol #6, the OFDM symbol #7, the OFDM symbol #10, and the OFDM symbol #11 are all OFDM symbols used for carrying DMRSs in configured time domain resources. Also, OFDM symbol #2, OFDM symbol #6, and OFDM symbol #10 are each the first two consecutive OFDM symbols for carrying DMRS symbols. Therefore, OFDM symbol #2, OFDM symbol #6, and OFDM symbol #10 may all be the starting symbol of the time domain resource of the PUSCH.
In this embodiment of the application, if the terminal is enabled to flexibly start, one OFDM symbol of the plurality of OFDM symbols for carrying the DMRS in the configured time domain resource may be used as a starting symbol of the time domain resource of the PUSCH. If the terminal does not enable flexible starting, the first OFDM symbol of the configured time domain resource in each unlicensed transmission period may be used as a starting symbol of the time domain resource of the PUSCH.
As illustrated in fig. 7, the OFDM symbols occupied by the configured time domain resources in slot 1 are OFDM symbol #2 to OFDM symbol # 13. OFDM symbol #2, OFDM symbol #5, OFDM symbol #8, OFDM symbol #10, and OFDM symbol #13 are all OFDM symbols used to carry DMRS in the configured time domain resource. Wherein OFDM symbol #2 is the first OFDM symbol of the configured time domain resource in unlicensed transmission period 1. OFDM symbol #10 is the first OFDM symbol of the configured time domain resource in unlicensed transmission period 2. In this way, if the terminal enables flexible start, OFDM symbol #2, OFDM symbol #5, OFDM symbol #8, and OFDM symbol #10 can all be used as the start symbol of the time domain resource of the PUSCH. If the terminal does not enable flexible start, only OFDM symbol #2 and OFDM symbol #10 may serve as start symbols of the time domain resource of the PUSCH.
It will be appreciated that whether the terminal enables flexible initiation may be determined according to a protocol or according to a configuration of the network device. Optionally, the network device may trigger the terminal to enable flexible initiation by any one of the following manners: (1) and the network equipment sends indication information to the terminal, wherein the indication information is used for indicating that one OFDM symbol in the configured time domain resources, which is used for carrying the DMRS, can be used as a starting symbol of the time domain resources of the PUSCH. Optionally, the indication information may be carried in RRC signaling, MAC-CE signaling, or DCI. (2) And the DMRS configuration issued by the network equipment comprises additional DMRS configuration information. Of course, the network device may also use other manners to trigger the terminal to enable flexible initiation, which is not limited in this embodiment of the present application.
How the terminal determines the time domain resource of the PUSCH is described below with reference to a specific example.
As an implementation manner, in a time slot where the starting symbol is located, the OFDM symbol, which is located in the same time slot and located in the configured time domain resource from the first X bits of the starting symbol, is determined as the time domain resource of the PUSCH. And X is determined according to the time domain resource configuration of the authorization-free transmission, and is a positive integer.
In the embodiment of the present application, X may be determined according to SLIV in a time domain resource configuration of unlicensed transmission. Further, X is determined from a length indication value (L) in the SLIV. In one embodiment, X may be equal to a length indication value in the SLIV. In another embodiment, X is a preset integer value less than L greater than 0.
In another embodiment, X may be a parameter independent of L in the time domain resource configuration.
For example, referring to fig. 9, it is assumed that X is 8, and OFDM symbols occupied by the configured time domain resource in slot 1 are OFDM symbol #2 to OFDM symbol # 13. OFDM symbol #2, OFDM symbol #5, OFDM symbol #8, OFDM symbol #10, and OFDM symbol #13 are all OFDM symbols used to carry DMRS in the configured time domain resource. As shown in the first case of fig. 9, if the terminal uses OFDM symbol #2 as the starting symbol of the time domain resource of the PUSCH, the time domain resource of the PUSCH includes OFDM symbol #2 to OFDM symbol # 9. As shown in case two in fig. 9, when the terminal uses OFDM symbol #5 as the starting symbol of the time domain resource of the PUSCH, the time domain resource of the PUSCH includes OFDM symbol #5 to OFDM symbol # 12.
As another implementation manner, in a time slot where the starting symbol is located, if there are fewer than X-1 OFDM symbols located in the configured time domain resource after the starting symbol, all OFDM symbols located in the configured time domain resource from the starting symbol in the time slot are determined as a time domain resource of a PUSCH.
As illustrated in fig. 9, assuming that X is 8, as shown in case three in fig. 9, if the terminal uses OFDM symbol #8 as the starting symbol of the time domain resource of PUSCH, the time domain resource of PUSCH includes OFDM symbol #8 to OFDM symbol # 13. As shown in case four in fig. 9, when the terminal uses OFDM symbol #10 as the starting symbol of the time domain resource of the PUSCH, the time domain resource of the PUSCH includes OFDM symbol #10 to OFDM symbol # 13.
As another implementation manner, in a time slot where the starting symbol is located, multiple OFDM symbols located in the same time slot and located in the same unlicensed transmission period in the configured time domain resources from the starting symbol are determined as the time domain resources of the PUSCH.
For example, referring to fig. 10, it is assumed that the number of OFDM symbols included in one unlicensed transmission period is 10, and the number of OFDM symbols included in the time domain resource for unlicensed transmission in one unlicensed transmission period is 8. For example, the unlicensed transmission period 1 includes OFDM symbol #0 to OFDM symbol #9 in slot 1. The time domain resource for the unlicensed transmission in the unlicensed transmission period 1 includes OFDM symbol #0 to OFDM symbol #7 in slot 1. The unlicensed transmission period 2 includes OFDM symbol #10 to OFDM symbol #13 in slot 1, and OFDM symbol #0 to OFDM symbol #5 in slot 2. The time domain resource for the unlicensed transmission in the period 2 includes OFDM symbol #10 to OFDM symbol #13 in slot 1, and OFDM symbol #0 to OFDM symbol #3 in slot 2. That is, in slot 1, the time domain resources that are allocated include OFDM symbol #0 to OFDM symbol #7, and OFDM symbol #10 to OFDM symbol # 13. In slot 1, OFDM symbol #0, OFDM symbol #3, OFDM symbol #6, OFDM symbol #10, and OFDM symbol #13 in slot 1 are all OFDM symbols for carrying DMRS.
As shown in the first case in fig. 10, if the terminal uses OFDM symbol #3 in slot 1 as the starting symbol of the time domain resource of the PUSCH, the time domain resource of the PUSCH includes OFDM symbol #3 to OFDM symbol #7 in slot 1 because OFDM symbol #3 to OFDM symbol #7 are located in the same slot and in the same unlicensed transmission period in the configured time domain resource. As shown in the second case in fig. 10, if the terminal uses OFDM symbol #10 in slot 1 as the starting symbol of the time domain resource of the PUSCH, the time domain resource of the PUSCH includes OFDM symbol #10 to OFDM symbol #13 in slot 1 because OFDM symbol #10 to OFDM symbol #13 are located in the same slot and in the same unlicensed transmission period in the configured time domain resource.
S103, the terminal sends the PUSCH on the time domain resource of the PUSCH.
As one implementation mode, the terminal transmits DMRS on at least one first symbol in the time domain resource of the PUSCH and transmits data on a second symbol in the time domain resource of the PUSCH. Wherein the first symbol is a non-zero subset of a plurality of OFDM symbols carrying DMRS in the configured time domain resource. The second symbol is an OFDM symbol except the at least one first symbol in the time domain resource of the PUSCH.
It can be understood that the terminal determines the first OFDM symbol contained in the time domain resource of the PUSCH according to the positions of the plurality of OFDM symbols used for carrying the DMRS in the configured time domain resource indicated by the DMRS configuration and the position of the OFDM symbol contained in the time domain resource of the PUSCH.
In the following description with reference to fig. 11, it is assumed that OFDM symbols occupied by the configured time domain resources in slot 1 are OFDM symbol #2 to OFDM symbol # 13. The OFDM symbol #2, the OFDM symbol #5, the OFDM symbol #8, the OFDM symbol #10, and the OFDM symbol #13 are all OFDM symbols used for carrying DMRSs in configured time domain resources. And, the value of X configured by the network device is 8.
As shown in the first case of fig. 11, if the first terminal uses OFDM symbol #2 as the starting symbol of the time domain resource of the PUSCH, the time domain resource of the PUSCH of the first terminal includes OFDM symbols #2 to # 9. The OFDM symbol #2, the OFDM symbol #5, and the OFDM symbol #8 are all first symbols in the time domain resource of the PUSCH of the first terminal, and correspondingly, the OFDM symbol #3, the OFDM symbol #4, the OFDM symbol #6, the OFDM symbol #7, and the OFDM symbol #9 are second symbols in the time domain resource of the PUSCH of the first terminal. Therefore, the first terminal transmits the DMRS on OFDM symbol #2, OFDM symbol #5, and OFDM symbol #8, and transmits data on OFDM symbol #3, OFDM symbol #4, OFDM symbol #6, OFDM symbol #7, and OFDM symbol # 9.
As shown in case two of fig. 11, if the second terminal uses OFDM symbol #5 as the starting symbol of the time domain resource of the PUSCH, the time domain resource of the PUSCH of the second terminal includes OFDM symbol #5 to OFDM symbol # 12. Here, OFDM symbol #5, OFDM symbol #8, and OFDM symbol #10 are all the first symbols in the time domain resources of the PUSCH of the second terminal. Accordingly, OFDM symbol #6, OFDM symbol #7, OFDM symbol #9, OFDM symbol #11, and OFDM symbol #12 are the second symbols in the time domain resources of the PUSCH of the second terminal. Therefore, the second terminal transmits the DMRS on OFDM symbol #5, OFDM symbol #8, and OFDM symbol #10, and transmits data on OFDM symbol #6, OFDM symbol #7, OFDM symbol #9, OFDM symbol #11, and OFDM symbol # 12.
It can be seen that OFDM symbol #5 to OFDM symbol #8 in common multiplexing slot 1 of the PUSCH of the first terminal and the PUSCH of the second terminal, but since the first terminal and the second terminal both transmit DMRS on OFDM symbol #5 and OFDM symbol #8, data is transmitted on OFDM symbol #6 and OFDM symbol # 7. In this way, since the data transmitted by the first terminal and the DMRS transmitted by the second terminal are not on the same OFDM symbol, and the DMRS transmitted by the first terminal and the data transmitted by the second terminal are likewise not on the same OFDM symbol, the data transmitted by the first terminal and the DMRS transmitted by the second terminal do not interfere with each other, and the DMRS transmitted by the first terminal and the data transmitted by the second terminal do not interfere with each other. This ensures the demodulation performance of the data.
That is to say, under the condition that the PUSCH transmitted by multiple terminals multiplexes time-frequency resources, the technical scheme of the present application can ensure that multiple terminals carry the DMRS in the multiplexed time-frequency resources with the same OFDM symbol, thereby avoiding mutual interference between data transmitted by any one of the multiple terminals and the DMRSs transmitted by other terminals, and ensuring demodulation performance of data transmitted by each terminal.
The application scenario of the example shown in fig. 11 is: the number of OFDM symbols contained in the license-exempt transmission period is greater than or equal to the number of OFDM contained in the time domain resource of the PUSCH. The following introduces a technical solution of the present application in a scenario where the number of OFDM symbols included in the grant transmission period is smaller than the number of OFDM symbols included in the time domain resource of the PUSCH. It can be understood that, when the number of OFDM symbols included in the unlicensed transmission period is less than the number of OFDM symbols included in the time domain resource of the PUSCH, all OFDM symbols included in the unlicensed transmission period may be used for unlicensed transmission for the terminal.
For example, as shown in fig. 12, the configured time domain resource at least includes an unlicensed transmission period 1 to an unlicensed transmission period 7, where the unlicensed transmission period 1 includes OFDM symbol #0 and OFDM symbol #1 in a slot 1, the unlicensed transmission period 2 includes OFDM symbol #2 and OFDM symbol #3 in the slot 1, the unlicensed transmission period 3 includes OFDM symbol #4 and OFDM symbol #5 in the slot 1, the unlicensed transmission period 4 includes OFDM symbol #6 and OFDM symbol #7 in the slot 1, the unlicensed transmission period 5 includes OFDM symbol #8 and OFDM symbol #9 in the slot 1, the unlicensed transmission period 6 includes OFDM symbol #10 and OFDM symbol #11 in the slot 1, and the unlicensed transmission period 7 includes OFDM symbol #12 and OFDM symbol #13 in the slot 1. The OFDM symbol #0, the OFDM symbol #4, the OFDM symbol #8, and the OFDM symbol #12 in the slot 1 are all OFDM symbols used for carrying DMRSs in configured time domain resources.
As shown in the first case in fig. 12, assuming that X takes a value of 8, if the terminal uses OFDM symbol #0 in slot 1 as the starting symbol of the time domain resource of PUSCH, the time domain resource of PUSCH includes OFDM symbol #0 to OFDM symbol # 7. For the time domain resource of the PUSCH, OFDM symbol #0 and OFDM symbol #4 in slot 1 are both the first symbol. Therefore, the terminal transmits the DMRS on OFDM symbol #0 and OFDM symbol #4 in slot 1, and transmits data on OFDM symbol #1, OFDM symbol #2, OFDM symbol #3, OFDM symbol #5, OFDM symbol #6, and OFDM symbol #7 in slot 1.
As shown in the second case in fig. 12, assuming that X takes a value of 8, if the terminal uses OFDM symbol #4 in slot 1 as the starting symbol of the time domain resource of PUSCH, the time domain resource of PUSCH includes OFDM symbol #4 to OFDM symbol # 11. For the time domain resource of this PUSCH, OFDM symbol #4 and OFDM symbol #8 in slot 1 are both the first symbol. Therefore, the terminal transmits the DMRS on OFDM symbol #4 and OFDM symbol #8 in slot 1, and transmits data on OFDM symbol #5, OFDM symbol #6, OFDM symbol #7, OFDM symbol #9, OFDM symbol #10, and OFDM symbol #11 in slot 1.
As shown in the third case in fig. 12, assuming that the value of X is 8, if the terminal uses OFDM symbol #8 in slot 1 as the starting symbol of the time domain resource of the PUSCH, the plurality of OFDM symbols located in slot 1 and located in the allocated time domain resource from OFDM symbol #8 in slot 1 are OFDM symbols #8 to #13, and the time domain resource of the PUSCH includes OFDM symbols #8 to # 13. For the time domain resource of this PUSCH, OFDM symbol #8 and OFDM symbol #12 in slot 1 are both the first symbol. Therefore, the terminal transmits the DMRS on OFDM symbol #8 and OFDM symbol #12 in slot 1, and transmits data on OFDM symbol #9, OFDM symbol #10, OFDM symbol #11, and OFDM symbol #13 in slot 1.
In addition, if the ending symbol of the time domain resource of the PUSCH is the first symbol and is the last OFDM symbol in the slot where the starting symbol is located, no information is transmitted on the ending symbol, or data is transmitted on the ending symbol. It should be noted that, if the cut-off symbol of the time domain resource of the PUSCH is the first symbol and is the last OFDM symbol in the slot where the starting symbol is located, the terminal sends the DMRS on the cut-off symbol, and the contribution to improving the data demodulation performance is limited. In this case, the terminal transmits data on the cutoff symbol, which is beneficial to reducing the overhead of the DMRS and improving the utilization rate of the time domain resource.
As illustrated in fig. 11, as shown in case three in fig. 11, if the terminal uses OFDM symbol #8 as the starting symbol of the time domain resource of the PUSCH, the time domain resource of the PUSCH includes OFDM symbols #8 to #13, where OFDM symbol #8, OFDM symbol #10, and OFDM symbol #13 are all the first symbols in the time domain resource of the PUSCH. In this case, since OFDM symbol #13 is an end symbol of a time domain resource of PUSCH and is the last OFDM symbol in a slot in which the start symbol is located, the terminal does not transmit any information on OFDM symbol #13 or transmits data on OFDM symbol # 13.
Optionally, the terminal transmits the DMRS on at least one first symbol in the time domain resource of the PUSCH, and the method further includes: transmitting a first DMRS on a first one of the at least one first symbol; transmitting a second DMRS on a non-first one of the at least one first symbol.
Wherein the first DMRS is different from the second DMRS. Optionally, the first DMRS being different from the second DMRS comprises one of: (1) the sequence of the first DMRS is different from the sequence of the second DMRS. For example, the cyclic shift of the sequence of the first DMRS is different from the cyclic shift of the sequence of the second DMRS. Or an Orthogonal Cover Code (OCC) of the sequence of the first DMRS. (2) The frequency domain resources occupied by the first DMRS are different from the frequency domain resources occupied by the second DMRS.
For example, referring to fig. 13, it is assumed that the configured time domain resources include OFDM symbols #2 to #13 in slot 1. In the slot 1, the OFDM symbol #2, the OFDM symbol #5, the OFDM symbol #8, the OFDM symbol #10, and the OFDM symbol #13 are all OFDM symbols used for carrying DMRSs in configured time-frequency resources.
As shown in the first case in fig. 13, if the time domain resource of the PUSCH of the terminal includes OFDM symbol #2 to OFDM symbol #9, where OFDM symbol #2, OFDM symbol #5, and OFDM symbol #8 are all the first symbols in the time domain resource of the PUSCH. OFDM symbol #2 is the first symbol in the time domain resources of this PUSCH. In this case, the terminal transmits the first DMRS on OFDM symbol #2 and the second DMRS on OFDM symbol #5 and OFDM symbol # 8.
As shown in the second case in fig. 13, if the time domain resource of the PUSCH of the terminal includes OFDM symbol #5 to OFDM symbol #12, where OFDM symbol #5, OFDM symbol #8, and OFDM symbol #10 are all the first symbols in the time domain resource of the PUSCH. OFDM symbol #5 is the first symbol in the time domain resources of this PUSCH. In this case, the terminal transmits the first DMRS on OFDM symbol #5, and transmits the second DMRS on OFDM symbol #8 and OFDM symbol # 10.
As can be seen, since the first symbol in the PUSCH is the starting symbol of the time domain resource of the PUSCH, when the network device receives the first DMRS on a certain OFDM symbol, the network device may determine that this OFDM symbol is the starting symbol of the time domain resource of the PUSCH, so that the network device can correctly receive the PUSCH and correctly demodulate data carried on the PUSCH.
In addition, if the number of OFDM symbols included in the time domain resource of the PUSCH transmitted by the terminal in one slot is M, where M is an integer smaller than X, the terminal may retransmit the PUSCH in the next slot, and the number of OFDM symbols included in the time domain resource for retransmitting the PUSCH may be greater than or equal to X-M. Data carried by the two PUSCHs are from the same part of the same Transport Block (TB), so that the reliability of data transmission is improved. Alternatively, the data carried by the two PUSCHs are from different parts of the same TB. Or, the data carried by the two PUSCHs are from different TBs.
Optionally, if the first OFDM symbol in the slot belongs to the configured time domain resource and is not an OFDM symbol for carrying the DMRS, but because other terminals do not transmit data on the first OFDM symbol in the slot, the terminal can use the first OFDM symbol in the slot as the starting symbol of the time domain resource of the PUSCH, which is beneficial to improving the utilization rate of the time frequency resource.
As illustrated in fig. 14, the configured time domain resources at least include OFDM symbol #2 to OFDM symbol #13 in slot 1, and OFDM symbol #0 to OFDM symbol #3 in slot 2. The OFDM symbol #2 to the OFDM symbol #9 in the slot 1 belong to the unlicensed transmission period 1, and the OFDM symbol #10 to the OFDM symbol #13 in the slot 1 and the OFDM symbol #0 to the OFDM symbol #3 in the slot 2 belong to the unlicensed transmission period 2. In slot 1, OFDM symbol #2, OFDM symbol #5, OFDM symbol #8, OFDM symbol #10, and OFDM symbol #13 are all OFDM symbols used for carrying DMRSs in the configured time domain resources. In the time slot 2, an OFDM symbol #2 is an OFDM symbol used for carrying a DMRS in the configured time-frequency resource.
As shown in fig. 14, assuming that X takes a value of 8 and the terminal uses OFDM symbol #10 in slot 1 as the time domain resource of PUSCH #1, the time domain resource of PUSCH #1 includes OFDM symbols #10 to # 13. The number of OFDM symbols contained in PUSCH #1 is 4, that is, the number of OFDM symbols contained in PUSCH #1 is smaller than X. In this case, in order to guarantee reliability of data transmission, the terminal transmits PUSCH #2 in the next slot. It can be understood that in slot 2, OFDM symbol #0 is not an OFDM symbol used by other terminals to carry data, and thus, the starting symbol of the time domain resource of PUSCH #2 may be OFDM symbol #0 in slot 2. In order to make the total number of OFDM symbols included in the time domain resources of PUSCH #1 and PUSCH #2 equal to or greater than X, the number of OFDM symbols included in the time domain resources of PUSCH #2 may be set to 4. In this way, the time domain resource of PUSCH #2 includes OFDM symbol #0 to OFDM symbol #3 in slot 2.
Optionally, if the number of OFDM symbols included in the time domain resource of the PUSCH determined according to the method in the foregoing embodiment is smaller than a preset value, the terminal may regard the time domain resource of the PUSCH as an invalid resource, that is, the PUSCH is not sent on the time domain resource of the PUSCH. Optionally, the preset value may be specified by a protocol, or may be preconfigured. If the preset value is preconfigured, the corresponding configuration information may be carried in RRC signaling, MAC-CE signaling, or DCI, which is not limited in this embodiment of the present invention.
As illustrated in fig. 7, the configured time domain resources occupy OFDM symbols #2 to #13 in slot 1. The OFDM symbol #2, the OFDM symbol #5, the OFDM symbol #8, the OFDM symbol #10, and the OFDM symbol #13 are all OFDM symbols for carrying DMRS. If the terminal determines that the OFDM symbol #13 is used as the starting symbol of the time domain resource of the PUSCH, the time domain resource of the PUSCH only includes the OFDM symbol #13, that is, the number of OFDM symbols included in the time domain resource of the PUSCH is 1. If the preset value is 2, the number of OFDM symbols contained in the time domain resource of the PUSCH is smaller than the preset value, and therefore the terminal does not send the PUSCH on the time domain resource of the PUSCH.
Based on the technical scheme shown in fig. 4, the terminal uses a plurality of OFDM symbols used for carrying the DMRS in the configured time domain resource as starting symbols of the PUSCH time domain resource, and transmits the DMRS on at least one first OFDM symbol in the PUSCH time domain, so as to ensure that the OFDM symbols used for carrying the DMRS in the plurality of PUSCHs transmitted by different terminals are aligned in the time domain, avoid a situation that the DMRS transmitted by one terminal and data transmitted by another terminal interfere with each other, and thus ensure the detection performance of the DMRS and the demodulation performance of the data.
As shown in fig. 15, another method for unlicensed transmission provided in the embodiment of the present application includes the following steps:
s201, the terminal receives time domain resource configuration and DMRS configuration of the license-free transmission.
The time domain resource configuration of the unlicensed transmission is used for determining a configured time domain resource and positions of a plurality of third symbols in the configured time domain resource, the third symbols can be used as starting symbols of a time domain resource of a PUSCH, the DMRS configuration is used for determining positions of first Resource Elements (REs) in the third symbols, and the first REs are used for carrying the DMRS.
S202, the terminal determines the time domain resource of the PUSCH according to the time domain resource configuration of the authorization-free transmission.
Wherein, the starting symbol of the time domain resource of the PUSCH is one of a plurality of third symbols in the configured time domain resource.
For example, the configured time domain resources include OFDM symbol #2 to OFDM symbol #9 in slot 1. In slot 1, OFDM symbol #2, OFDM symbol #4, OFDM symbol #6, and OFDM symbol #8 are all the third symbols, and thus OFDM symbol #2, OFDM symbol #4, OFDM symbol #6, and OFDM symbol #8 may all be the starting symbols of the time domain resource of the PUSCH.
As an implementation manner, in a time slot where the starting symbol is located, the OFDM symbol, which is located in the same time slot and located in the configured time domain resource from the first X bits of the starting symbol, is determined as the time domain resource of the PUSCH. And X is determined according to the time domain resource configuration of the authorization-free transmission, and is a positive integer. In the embodiment of the present application, X may be determined according to SLIV in a time domain resource configuration of unlicensed transmission. Further, X is determined from a length indication value (L) in the SLIV. In one embodiment, X may be equal to a length indication value (L) in the SLIV.
For example, referring to fig. 16, it is assumed that X is 8, and OFDM symbols occupied by the configured time domain resource in slot 1 are OFDM symbol #2 to OFDM symbol # 13. OFDM symbol #2, OFDM symbol #4, OFDM symbol #6, OFDM symbol #8, OFDM symbol #10, and OFDM symbol #12 are all the third symbols in the configured time domain resource. As shown in the first case in fig. 16, when the terminal uses OFDM symbol #2 as the starting symbol of the time domain resource of the PUSCH, the time domain resource of the PUSCH includes OFDM symbol #2 to OFDM symbol # 9. As shown in case two in fig. 16, when the terminal uses OFDM symbol #4 as the starting symbol of the time domain resource of the PUSCH, the time domain resource of the PUSCH includes OFDM symbol #4 to OFDM symbol # 11.
As another implementation manner, in a time slot where the starting symbol is located, if there are fewer than X-1 OFDM symbols located in the configured time domain resource after the starting symbol, all OFDM symbols located in the configured time domain resource from the starting symbol in the time slot are determined as a time domain resource of a PUSCH.
As illustrated in fig. 16, assuming that X is 8, as shown in case three in fig. 16, if the terminal uses OFDM symbol #8 as the starting symbol of the time domain resource of PUSCH, the time domain resource of PUSCH includes OFDM symbol #8 to OFDM symbol # 13. As shown in case four in fig. 16, when the terminal uses OFDM symbol #10 as the starting symbol of the time domain resource of the PUSCH, the time domain resource of the PUSCH includes OFDM symbol #10 to OFDM symbol # 13.
As another implementation manner, in a time slot where the starting symbol is located, multiple OFDM symbols located in the same time slot and located in the same unlicensed transmission period in the configured time domain resources from the starting symbol are determined as the time domain resources of the PUSCH.
For example, referring to fig. 17, it is assumed that the number of OFDM symbols included in one unlicensed transmission period is 10, and the number of OFDM symbols included in the time domain resource for unlicensed transmission in one unlicensed transmission period is 8. For example, the unlicensed transmission period 1 includes OFDM symbol #0 to OFDM symbol #9 in slot 1. The time domain resource for the unlicensed transmission in the unlicensed transmission period 1 includes OFDM symbol #0 to OFDM symbol #7 in slot 1. The unlicensed transmission period 2 includes OFDM symbol #10 to OFDM symbol #13 in slot 1, and OFDM symbol #0 to OFDM symbol #5 in slot 2. The time domain resource for the unlicensed transmission in the period 2 includes OFDM symbol #10 to OFDM symbol #13 in slot 1, and OFDM symbol #0 to OFDM symbol #3 in slot 2. That is, in slot 1, the time domain resources that are allocated include OFDM symbol #0 to OFDM symbol #7, and OFDM symbol #10 to OFDM symbol # 13. In slot 1, OFDM symbol #0, OFDM symbol #2, OFDM symbol #4, OFDM symbol #6, OFDM symbol #10, and OFDM symbol #12 are all the third symbols.
As shown in the first case in fig. 17, if the terminal uses OFDM symbol #4 in slot 1 as the starting symbol of the time domain resource of the PUSCH, the time domain resource of the PUSCH includes OFDM symbol #4 to OFDM symbol #7 in slot 1 because OFDM symbol #4 to OFDM symbol #7 are located in the same slot and in the same unlicensed transmission period in the configured time domain resource. As shown in the second case in fig. 17, if the terminal uses OFDM symbol #10 in slot 1 as the starting symbol of the time domain resource of the PUSCH, the time domain resource of the PUSCH includes OFDM symbol #10 to OFDM symbol #13 in slot 1 because OFDM symbol #10 to OFDM symbol #13 are located in the same slot and in the same unlicensed transmission period in the configured time domain resource.
S203, the terminal sends data on a second RE which is not the first third symbol in the time domain resource of the PUSCH.
Wherein, the plurality of third symbols included in the time domain resource of the PUSCH are a non-zero subset of the plurality of third symbols included in the configured time domain resource. The second RE is the other RE except for the first RE in the third symbol.
When the terminal transmits data on the second RE other than the first third symbol, the terminal increases the transmission power on the second RE for transmitting data so that the transmission power of the non-first third symbol is substantially the same as the transmission power of another symbol (that is, a fourth symbol described below).
In addition, the terminal transmits the DMRS on the first RE of the first third symbol in the time domain resource of the PUSCH.
In addition, the terminal transmits data on a fourth symbol in the time domain resource of the PUSCH, wherein the fourth symbol is other OFDM symbols except the third symbol in the time domain resource of the PUSCH.
As illustrated in fig. 18, the OFDM symbols occupied by the configured time domain resources in slot 1 are OFDM symbol #2 to OFDM symbol # 13. OFDM symbol #2, OFDM symbol #4, OFDM symbol #6, OFDM symbol #8, OFDM symbol #10, and OFDM symbol #12 are all the third symbols in the configured time domain resource. As shown in fig. 18, the time domain resource of the PUSCH includes OFDM symbol #4 to OFDM symbol #11, and OFDM symbol #4, OFDM symbol #6, OFDM symbol #8, and OFDM symbol #10 are all the third symbols included in the time domain resource of the PUSCH. The OFDM symbol #4 is the first third symbol in the time domain resource of the PUSCH, and the OFDM symbol #6, the OFDM symbol #8, and the OFDM symbol #10 are non-first third symbols in the time domain resource of the PUSCH. Therefore, the terminal transmits the DMRS on OFDM symbol #4, and transmits data on the second RE in OFDM symbol #6, OFDM symbol #8, and OFDM symbol # 10.
Based on the technical solution shown in fig. 15, since the terminal transmits data on the second RE that is not the first third symbol in the time domain resource of the PUSCH, and does not transmit data on the first RE on the third symbol, the data transmitted by the terminal and the DMRSs transmitted by other terminals are frequency-divided on the third symbol, so that the data transmitted by the terminal and the DMRSs transmitted by other terminals do not interfere with each other, and the demodulation performance of the data transmitted by the terminal and the detection performance of the DMRSs transmitted by other terminals are ensured.
In order TO improve the reliability of data transmission, the unlicensed transmission supports repeated transmission, that is, the terminal may repeatedly transmit the PUSCH at multiple Transmission Occasions (TOs). One unlicensed transmission period includes at least one transmission opportunity, and each transmission opportunity may be understood as a time domain resource for carrying a PUSCH once.
Currently, on the one hand, in order to reduce the overhead of DMRS, in the process of repeatedly transmitting PUSCH, the PUSCH corresponding to each transmission opportunity does not necessarily carry the DMRS. On the other hand, in order to reduce the delay of demodulation, in the process of repeatedly transmitting the PUSCH, the PUSCH corresponding to the first transmission opportunity among the plurality of transmission opportunities is required to carry the DMRS. This results in that, at the same transmission opportunity, some terminals transmit PUSCH carrying DMRS, and other terminals transmit PUSCH without DMRS. That is, some terminals transmit DMRS and other terminals transmit data on a certain OFDM symbol in the same transmission opportunity. This results in that data transmitted by some terminals interfere with DMRSs transmitted by other terminals, which affects the detection performance of DMRSs and the demodulation performance of data.
In order to solve the above technical problem, as shown in fig. 19, a method for unlicensed transmission is provided for an embodiment of the present application, where the method includes the following steps:
s301, the terminal receives time domain resource configuration and DMRS configuration of the license-exempt transmission.
Wherein the grant-free time domain resource configuration is configured to determine locations of a plurality of transmission occasions in the configured time domain resource, and the DMRS configuration is configured to determine locations of a plurality of first transmission occasions in the configured time domain resource.
It is to be appreciated that the plurality of first transmission occasions is a non-zero subset of the plurality of transmission occasions. The first transmission opportunity is used for bearing a PUSCH carrying the DMRS, and the non-first transmission opportunity is used for bearing a PUSCH not carrying the DMRS. The non-first transmission opportunity may also be referred to as a second transmission opportunity. Optionally, the first transmission timing is a transmission timing corresponding to Redundancy Version (RV) 0.
It should be noted that, the number of OFDM symbols included in each of the multiple transmission occasions may be the same or different, and this is not limited in this embodiment of the present application. In addition, the number of OFDM symbols included in each of the plurality of transmission occasions may be configured by the network device or defined in a standard.
The terminal transmits a PUSCH on the first transmission opportunity, and the PUSCH carries the DMRS. And the terminal sends the PUSCH on the transmission opportunity without carrying the DMRS, and the PUSCH does not carry the DMRS.
S302, the terminal determines an initial transmission opportunity according to the time domain resource configuration of the authorization-free transmission and the DMRS configuration.
Wherein the starting transmission opportunity is one of the plurality of first transmission opportunities.
For example, referring to fig. 20, the unlicensed transmission cycle 1 includes a transmission timing #1, a transmission timing #2, a transmission timing #3, and a transmission timing #4, and the unlicensed transmission cycle 2 includes a transmission timing #5, a transmission timing #6, a transmission timing #7, and a transmission timing # 8. Here, the transmission timing #1, the transmission timing #3, the transmission timing #5, and the transmission timing #7 are all the first transmission timings. Therefore, the terminal can select one transmission timing from among the transmission timing #1, the transmission timing #3, the transmission timing #5, and the transmission timing #7 as the start transmission timing.
S303, the terminal sends the PUSCH at the initial transmission opportunity.
As an implementation manner, if the terminal is configured with repeated transmission, the terminal repeatedly sends PUSCH at K transmission occasions from the starting transmission occasion to ensure reliability of data transmission. Wherein the K transmission occasions are a non-zero subset of the plurality of transmission occasions. The K transmission occasions may be located in the same time slot or in different time slots.
Optionally, K is the configured number of repeated transmissions. The configured number of repeated transmissions may be configured by the network device, or may be defined in a standard. In this case, the K transmission occasions may belong to the same unlicensed transmission period or may belong to different unlicensed transmission periods.
As shown in case one in fig. 20, assuming that the number of repeated transmissions of the configuration is 4, the terminal starts a transmission timing at transmission timing #1, and then repeatedly transmits a PUSCH at transmission timing #1, transmission timing #2, transmission timing #3, and transmission timing # 4.
As shown in case two in fig. 20, assuming that the number of repeated transmissions of the configuration is 4, and the terminal starts a transmission timing at transmission timing #3, the terminal repeatedly transmits a PUSCH at transmission timing #3, transmission timing #4, transmission timing #5, and transmission timing # 6.
Optionally, K is less than the configured number of repeated transmission times, where K is the number of all transmission opportunities from the initial transmission opportunity in an authorization-free transmission period in which the initial transmission opportunity is located. That is, the K transmission occasions are all transmission occasions from the initial transmission occasion in the unlicensed transmission period in which the initial transmission occasion is located. In this case, the K transmission occasions belong to the same unlicensed transmission period.
As shown in case three in fig. 20, assuming that the number of repeated transmissions of the configuration is 4, and the terminal starts a transmission opportunity at transmission opportunity #3, all transmission opportunities from transmission opportunity #3 in the unlicensed transmission period 1 include transmission opportunity #3 and transmission opportunity # 4. Therefore, the terminal repeatedly generates PUSCH at transmission timing #3 and transmission timing # 4.
Based on the technical solution shown in fig. 19, the terminal selects one of the plurality of first transmission occasions as the initial transmission occasion. In this way, since the PUSCH transmitted by the other terminal at the first transmission timing also carries the DMRS, the terminal transmits the PUSCH at the initial transmission timing, and the DMRS carried by the PUSCH does not affect data transmitted by the other terminal, thereby preventing the DMRS transmitted by one terminal and data transmitted by another terminal from interfering with each other.
It is to be understood that the terminal includes corresponding hardware structures and/or software modules for performing each function in order to implement the above functions. Those of skill in the art would readily appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as hardware or combinations of hardware and computer software. Whether a function is performed as hardware or computer software drives hardware depends upon the particular application and design constraints imposed on the solution. 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.
In the embodiment of the present application, the terminal may be divided into the functional modules according to the above method example, for example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. It should be noted that, in the embodiment of the present application, the division of the module is schematic, and is only one logic function division, and there may be another division manner in actual implementation. The following description will be given by taking the case of dividing each function module corresponding to each function:
fig. 21 is a schematic structural diagram of a communication device according to an embodiment of the present application. The communication device comprises a receiving module 201, a processing module 202 and a transmitting module 203. Wherein the receiving module 201 is configured to support the communication device to perform step S101 in fig. 4, step S201 in fig. 15, step S301 in fig. 19, and/or other processes for the technical solutions described herein. The processing module 202 is configured to support the communication device to perform step S102 in fig. 4, step S202 in fig. 15, step S302 in fig. 19, and/or other processes for the solution described herein. The sending module 203 is configured to support the communication device to perform step S103 in fig. 4, step S203 in fig. 15, step S303 in fig. 19, and/or other processes for the technical solutions described herein. All relevant contents of each step related to the above method embodiment may be referred to the functional description of the corresponding functional module, and are not described herein again.
As an example, in conjunction with the terminal shown in fig. 3, the sending module 203 and the receiving module 201 in fig. 21 may be implemented by the communication interface 104 in fig. 3, and the processing module 202 in fig. 21 may be implemented by the processor 101 in fig. 3, which is not limited in this embodiment.
The embodiment of the application also provides a computer readable storage medium, wherein the computer readable storage medium stores computer instructions; the computer readable storage medium, when run on the terminal shown in fig. 3, causes the terminal to perform a method of unlicensed transmission as shown in fig. 4, 15 or 19. The computer instructions may be stored on a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, 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 can comprise one or more data storage devices, such as a server, a data center, etc., that can be integrated with the medium. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium, or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.
The embodiment of the present application further provides a chip, which includes a processing module and a communication interface, where the communication interface is configured to receive an input signal and provide the input signal to the processing module, and/or is configured to process a signal output generated by the processing module. The process is used to support the terminal to perform the method of unlicensed transmission as shown in fig. 4, fig. 15 or fig. 19. . In an embodiment, the processing module may execute the code instructions to perform the method of unlicensed transmission as illustrated in fig. 4, 15 or 19 to generate the PUSCH. The code instructions may come from memory internal to the chip or from memory external to the chip. Wherein, the processing module is a processor or a microprocessor or an integrated circuit integrated on the chip. The communication interface may be an input-output circuit or a transceiving pin.
Embodiments of the present application also provide a computer program product containing computer instructions, which when run on the terminal shown in fig. 3, enable the terminal to execute the method for unlicensed transmission shown in fig. 4, fig. 15 or fig. 19.
The terminal, the computer storage medium, the chip and the computer program product provided in the embodiments of the present application are all used for executing the method for license-exempt transmission provided above, and therefore, the beneficial effects that can be achieved by the terminal, the computer storage medium, the chip and the computer program product can refer to the beneficial effects corresponding to the method provided above, and are not described herein again.
Although the present application has been described in conjunction with specific features and embodiments thereof, it will be evident that various modifications and combinations can be made thereto without departing from the spirit and scope of the application. Accordingly, the specification and figures are merely exemplary of the present application as defined in the appended claims and are intended to cover any and all modifications, variations, combinations, or equivalents within the scope of the present application. 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 spirit and 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 (23)

1. A method of unlicensed transmission, the method comprising:
receiving a time domain resource configuration of an unlicensed transmission and a demodulation reference signal (DMRS) configuration, wherein the time domain resource configuration of the unlicensed transmission is used for determining a configured time domain resource, and the DMRS configuration is used for determining the positions of a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols for carrying DMRS in the configured time domain resource;
determining time domain resources of a Physical Uplink Shared Channel (PUSCH) according to the time domain resource configuration of the authorization-free transmission and the DMRS configuration, wherein the time domain resources of the PUSCH are non-zero subsets of the configured time domain resources, and a starting symbol of the time domain resources of the PUSCH is one of a plurality of OFDM symbols used for bearing the DMRS in the configured time domain resources;
and sending the PUSCH on the time domain resource of the PUSCH.
2. The method of claim 1, wherein the starting symbol of the time domain resource of the PUSCH is one of a plurality of OFDM symbols carrying additional DMRS in the configured time domain resource.
3. The method of claim 1 or 2, wherein determining the time domain resource of the PUSCH according to the time domain resource configuration of the unlicensed transmission and the DMRS configuration comprises:
in the time slot where the starting symbol is located, determining the OFDM symbol which is located in the same time slot from the first X bits of the starting symbol and is located in the configured time domain resource as the time domain resource of the PUSCH; and X is determined according to the time domain resource configuration of the authorization-free transmission, and is a positive integer.
4. The method of claim 1 or 2, wherein determining the time domain resource of the PUSCH according to the time domain resource configuration of the unlicensed transmission and the DMRS configuration comprises:
in the time slot where the starting symbol is located, if fewer than X-1 OFDM symbols located in the configured time domain resource exist after the starting symbol, determining all the OFDM symbols located in the configured time domain resource from the starting symbol in the time slot as the time domain resource of the PUSCH; and X is determined according to the time domain resource configuration of the authorization-free transmission, and is a positive integer.
5. The method of claim 1 or 2, wherein determining the time domain resource of the PUSCH according to the time domain resource configuration of the unlicensed transmission and the DMRS configuration comprises:
and in the time slot where the starting symbol is located, determining a plurality of OFDM symbols which are located in the same time slot and in the same unlicensed transmission period in the configured time domain resources from the starting symbol as the time domain resources of the PUSCH.
6. The method for unlicensed transmission according to claim 1 or 2, wherein the sending of the PUSCH on the time domain resources of the PUSCH comprises:
and transmitting the DMRS on at least one first symbol in the time domain resources of the PUSCH, wherein the first symbol is a non-zero subset of the plurality of OFDM symbols used for carrying the DMRS in the configured time domain resources.
7. The method of claim 6, wherein the sending the PUSCH on the time domain resource of the PUSCH comprises:
and transmitting data on a second symbol in the time domain resources of the PUSCH, wherein the second symbol is an OFDM symbol except the at least one first symbol in the time domain resources of the PUSCH.
8. The method of claim 6, wherein the sending the PUSCH on the time domain resource of the PUSCH comprises:
and if the ending symbol of the time domain resource of the PUSCH is the first symbol and the last OFDM symbol in the time slot in which the starting symbol is positioned, not sending any information on the ending symbol, or sending data on the ending symbol.
9. The method of claim 6, wherein the transmitting the DMRS on at least one first symbol in the time domain resource of the PUSCH comprises:
transmitting a first DMRS on a first one of the at least one first symbol;
transmitting a second DMRS on a non-first one of the at least one first symbol.
10. The method of claim 1 or 2, wherein the method further comprises:
and receiving indication information, wherein the indication information is used for indicating that one OFDM symbol in the plurality of OFDM symbols for carrying the DMRS in the configured time domain resources can be used as a starting symbol of the time domain resources of the PUSCH.
11. The method of claim 1 or 2, wherein if the DMRS configuration contains additional DMRS configuration information, one of the plurality of DMRS-carrying OFDM symbols in the configured time-domain resource can be used as a starting symbol of the time-domain resource of the PUSCH.
12. A communications apparatus, comprising:
the device comprises a receiving module, a demodulation reference signal (DMRS) configuration and a time domain resource configuration of unlicensed transmission, wherein the time domain resource configuration of unlicensed transmission is used for determining configured time domain resources, and the DMRS configuration is used for determining the positions of a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols for carrying DMRS in the configured time domain resources;
a processing module, configured to determine, according to the time domain resource configuration of the grant-free transmission and the DMRS configuration, a time domain resource of a physical uplink shared channel, PUSCH, where the time domain resource of the PUSCH is a non-zero subset of the configured time domain resource, and a starting symbol of the time domain resource of the PUSCH is one of a plurality of OFDM symbols used for carrying the DMRS in the configured time domain resource;
and the sending module is used for sending the PUSCH on the time domain resource of the PUSCH.
13. The communications apparatus of claim 12, wherein a starting symbol of the time domain resource of the PUSCH is one of a plurality of OFDM symbols used to carry an additional DMRS in the configured time domain resource.
14. The communications apparatus as claimed in claim 12 or 13, wherein the processing module is configured to determine the time domain resource of the PUSCH according to the time domain resource configuration of the grant-free transmission and the DMRS configuration, and comprises:
in the time slot where the starting symbol is located, determining the OFDM symbol which is located in the same time slot from the first X bits of the starting symbol and is located in the configured time domain resource as the time domain resource of the PUSCH; and X is determined according to the time domain resource configuration of the authorization-free transmission, and is a positive integer.
15. The communications apparatus as claimed in claim 12 or 13, wherein the processing module is configured to determine the time domain resource of the PUSCH according to the time domain resource configuration of the grant-free transmission and the DMRS configuration, and comprises:
in the time slot where the starting symbol is located, if fewer than X-1 OFDM symbols located in the configured time domain resource exist after the starting symbol, determining all the OFDM symbols located in the configured time domain resource from the starting symbol in the time slot as the time domain resource of the PUSCH; and X is determined according to the time domain resource configuration of the authorization-free transmission, and is a positive integer.
16. The communications apparatus as claimed in claim 12 or 13, wherein the processing module is configured to determine the time domain resource of the PUSCH according to the time domain resource configuration of the grant-free transmission and the DMRS configuration, and comprises:
and in the time slot where the starting symbol is located, determining a plurality of OFDM symbols which are located in the same time slot and in the same unlicensed transmission period in the configured time domain resources from the starting symbol as the time domain resources of the PUSCH.
17. The communications apparatus of claim 12 or 13, wherein the means for transmitting PUSCH on the time domain resources of PUSCH comprises:
and transmitting the DMRS on at least one first symbol in the time domain resources of the PUSCH, wherein the first symbol is a non-zero subset of the plurality of OFDM symbols used for carrying the DMRS in the configured time domain resources.
18. The communications apparatus of claim 17, wherein the means for transmitting PUSCH on the time domain resources of PUSCH comprises:
and transmitting data on a second symbol in the time domain resources of the PUSCH, wherein the second symbol is an OFDM symbol except the at least one first symbol in the time domain resources of the PUSCH.
19. The communications apparatus of claim 17, wherein the means for transmitting PUSCH on the time domain resources of PUSCH comprises:
and if the ending symbol of the time domain resource of the PUSCH is the first symbol and the last OFDM symbol in the time slot in which the starting symbol is positioned, not sending any information on the ending symbol, or sending data on the ending symbol.
20. The communications apparatus of claim 17, wherein the means for transmitting the DMRS on at least one first symbol in the time domain resources of the PUSCH comprises:
transmitting a first DMRS on a first one of the at least one first symbol;
transmitting a second DMRS on a non-first one of the at least one first symbol.
21. The communication device according to claim 12 or 13,
the receiving module is further configured to receive indication information, where the indication information is used to indicate that one OFDM symbol of the multiple OFDM symbols for carrying the DMRS in the configured time domain resource may be used as a starting symbol of the time domain resource of the PUSCH.
22. The communication apparatus according to claim 12 or 13, wherein if the DMRS configuration includes additional DMRS configuration information, one of the plurality of DMRS-bearing OFDM symbols in the configured time-domain resource may be used as a starting symbol of the time-domain resource of the PUSCH.
23. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program comprising program instructions which, when executed by a processor, cause the processor to carry out the method of license-exempt transmission of any of claims 1 to 11.
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