CN109217974B - Data transmission method and related equipment - Google Patents
Data transmission method and related equipment Download PDFInfo
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- CN109217974B CN109217974B CN201710516717.5A CN201710516717A CN109217974B CN 109217974 B CN109217974 B CN 109217974B CN 201710516717 A CN201710516717 A CN 201710516717A CN 109217974 B CN109217974 B CN 109217974B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0045—Arrangements at the receiver end
- H04L1/0052—Realisations of complexity reduction techniques, e.g. pipelining or use of look-up tables
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1829—Arrangements specially adapted for the receiver end
- H04L1/1864—ARQ related signaling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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- H04W72/04—Wireless resource allocation
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Abstract
The application provides a data transmission method and related equipment, and the method comprises the following steps: a network device generates a configuration message, the configuration message comprising: one or more hybrid automatic repeat request (HARQ) process numbers, wherein each HARQ process number corresponds to one or more unlicensed transmission resources; the configuration message is used for configuring one or more authorization-free transmission resources for the terminal equipment in each time domain period; the network equipment sends the configuration message to the terminal equipment, so that the problem that the HARQ process number used by the terminal equipment for sending data cannot be determined due to the fact that the retransmission times of the data are judged by mistake by the base station, and decoding cannot be performed is solved, the base station can successfully demodulate the data when receiving the authorization-free transmission data, and meanwhile the complexity of a receiver is reduced.
Description
Technical Field
The present application relates to the field of wireless communication technologies, and in particular, to a data transmission method and related devices.
Background
An Ultra Reliability and Low Latency Communication (URLLC) scenario is one of the application scenarios for 5G Communication. In URLLC, both reliability of data transmission and low latency characteristics need to be satisfied. To meet the requirement of low latency, a new transmission mechanism is proposed and becomes a technology of 5G communication. In the present application, this new transmission scheme is referred to as a Grant-free (Grant-free) transmission scheme, but may be referred to by other similar names, and the basic idea is that when a terminal device has new data, it does not need to request a resource from a base station, but directly transmits the data to the base station using a pre-allocated resource. The base station receives the data transmitted by the terminal equipment on the pre-allocated resources by means of a receiving technology such as a blind detection side. Data transmitted using the Grant-free is referred to as Grant-free data, and the pre-allocated resources for Grant-free transmission are referred to as Grant-free resources.
In order to improve the transmission reliability of the authorization-free data, the terminal device may send the authorization-free data to the base station by using a repetitive transmission technique. In the repetitive transmission technique, the terminal device may repeatedly transmit certain data on consecutive K (K >1) slots (slots) without waiting for any feedback of the base station, e.g., NACK or scheduling information, etc. As shown in fig. 1, when the terminal device transmits data by using the retransmission technique, it sends a Redundancy Version (RV) of the data on each slot, where the Redundancy versions sent on different slots may be the same or different.
In order to further improve the reliability of data transmission, research is being conducted to introduce Hybrid Auto ReQuest (HARQ) technology, which is widely used in existing mobile communication systems (e.g., Long Term Evolution (LTE) systems), into 5G communication. In the HARQ technology, after a transmitting end initially transmits a certain data in a slot or multiple consecutive slots, if an indication that the receiving end incorrectly receives the data is received, the transmitting end retransmits a redundancy version of the data, so that the receiving end can perform combined reception according to the retransmitted data and the initially transmitted data, thereby improving the transmission reliability of the data.
In order to implement the HARQ function, when retransmitting data, the terminal device needs to know which initially transmitted data corresponds to the retransmitted data, and when receiving the retransmitted data, the base station also needs to know which initially transmitted data corresponds to the retransmitted data, so that the received initially transmitted data and the retransmitted data can be combined to improve the transmission reliability of the data. This process is ensured by the HARQ process, that is, when receiving the retransmitted data, the base station will know the HARQ process information, such as the process number (ID), corresponding to the retransmitted data, and then combine the retransmitted data with the buffered data in the buffer of the corresponding HARQ process.
In the Grant-free transmission mechanism, HARQ processes used by the terminal device for K transmissions are all the same when the terminal device transmits data using the retransmission technique, and the HARQ process number of the used HARQ process is determined by the first transmission in the K transmissions. Therefore, when receiving data transmitted by using the retransmission technique, the base station needs to detect the first transmission of the K transmissions and determine that the transmission is the first transmission, so as to determine the HARQ process number of the HARQ process used by the K transmissions.
Due to the uncertainty of the data arrival time at the terminal equipment side and the low delay requirement of data transmission in the URLLC scenario, if the unlicensed resource is available, the terminal equipment will use the unlicensed resource to send data to the base station in as short a time as possible after the data arrives, which means that the terminal equipment will start sending K times of repeated transmissions of the data on any slot configured with the unlicensed resource. The starting position of the repeated transmission is not fixed and unpredictable for both the terminal and the base station. In this case, since the base station needs to determine the HARQ process number used by the terminal device to send data by relying on detection, i.e., determination, of the first transmission in the repeated transmissions, once the base station does not detect and determine the first transmission, the base station cannot determine the HARQ process number used by the terminal device to send data.
Disclosure of Invention
The embodiment of the application provides a data transmission method and related equipment, and by determining various corresponding relations among HARQ process numbers, redundancy versions and authorization-free transmission resources, the problem that a base station cannot determine the HARQ process numbers used by terminal equipment for sending data due to misjudging the retransmission times of data, so that decoding cannot be performed is solved, the base station can successfully demodulate the data when receiving the authorization-free transmission data, and meanwhile, the complexity of a receiver is reduced.
In a first aspect, an embodiment of the present application provides a data transmission method, including:
a network device generates a configuration message, the configuration message comprising: one or more hybrid automatic repeat request (HARQ) process numbers, wherein each HARQ process number corresponds to one or more unlicensed transmission resources; the configuration message is used for configuring one or more authorization-free transmission resources for the terminal equipment in each time domain period;
and the network equipment sends the configuration message to the terminal equipment.
In a second aspect, an embodiment of the present application provides a data transmission method, including:
the method comprises the following steps that terminal equipment receives configuration information sent by network equipment, and the configuration information comprises: one or more hybrid automatic repeat request (HARQ) process numbers, wherein each HARQ process number corresponds to one or more unlicensed transmission resources; the configuration message is used for configuring one or more authorization-free transmission resources for the terminal equipment in each time domain period;
the terminal equipment determines one or more authorization-free transmission resources used for transmitting data in a current transmission time interval TTI according to the corresponding relation between the HARQ process number and the authorization-free transmission resources;
and the terminal equipment transmits the data through the determined authorization-free transmission resource.
In a third aspect, an embodiment of the present application provides a data transmission method, including: the method comprises the following steps that terminal equipment receives configuration information sent by network equipment, and the configuration information comprises: frequency resource location information for each unlicensed transmission resource;
the terminal equipment determines an HARQ process number corresponding to each unlicensed transmission resource according to the frequency resource position information of each unlicensed transmission resource;
determining one or more unlicensed transmission resources used for transmitting data in the current TTI according to the corresponding relation between the determined HARQ process number and the unlicensed transmission resources;
and the terminal equipment transmits the data through the determined authorization-free transmission resource.
In a fourth aspect, an embodiment of the present application provides a network device, including:
a first processing unit configured to generate a configuration message, the configuration message including: one or more hybrid automatic repeat request (HARQ) process numbers, wherein each HARQ process number corresponds to one or more unlicensed transmission resources; wherein the configuration message is used for configuring one or more unlicensed transmission resources for the terminal device in each time domain period
The first transceiving unit is used for sending the configuration message.
In a fourth aspect, an embodiment of the present application provides a terminal device, including:
a second transceiver, configured to receive a configuration message sent by a network device, where the configuration message includes: one or more hybrid automatic repeat request (HARQ) process numbers, wherein each HARQ process number corresponds to one or more unlicensed transmission resources; the configuration message is used for configuring one or more authorization-free transmission resources for the terminal equipment in each time domain period; and transmitting the data through the determined unlicensed transmission resource according to the indication of the second processor.
A second processor, configured to determine, according to a corresponding relationship between the HARQ process number and the unlicensed transmission resource, one or more unlicensed transmission resources used for transmitting data in a current transmission time interval TTI; instructing the second transceiver to transmit the data over the determined unlicensed transmission resources.
In a fifth aspect, an embodiment of the present application provides a terminal device, including:
a third transceiving unit, configured to receive a configuration message sent by a network device, where the configuration message includes: frequency resource location information for each unlicensed transmission resource; the data is sent through the determined authorization-free transmission resource according to the indication of the third processing unit;
a third processing unit, configured to determine, according to frequency resource location information of each unlicensed transmission resource, an HARQ process number corresponding to each unlicensed transmission resource; determining one or more unlicensed transmission resources used for transmitting data in the current TTI according to the corresponding relation between the determined HARQ process number and the unlicensed transmission resources; instructing the third transceiving unit to transmit the data through the determined unlicensed transmission resource.
In a sixth aspect, an embodiment of the present application provides a data communication system, including: comprising the network device described in the above first aspect and the terminal device described in the above second aspect.
In the embodiment of the application, a data transmission method, related equipment and a system are provided, and by determining various corresponding relations among the HARQ process number, the redundancy version and the authorization-free transmission resource, the problem that the HARQ process number used by the terminal equipment for sending data cannot be determined due to the fact that the retransmission times of the data are judged by mistake by a base station, and then decoding cannot be performed is solved, the base station can correctly demodulate the data when receiving the authorization-free transmission data, and meanwhile the complexity of a receiver is reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the background art of the present application, the drawings required to be used in the embodiments or the background art of the present application will be described below.
Fig. 1 is a schematic diagram of a process of repetitive transmission provided by the prior art;
FIG. 2 is a diagram of a system architecture disclosed in an embodiment of the present application;
fig. 3 is a schematic diagram of a transmission method according to an embodiment disclosed in the present application;
fig. 4 is a schematic diagram of HARQ transmission in an embodiment of the disclosure;
fig. 5 is a schematic diagram of HARQ transmission in another embodiment of the present disclosure;
FIG. 6 is a schematic diagram of a user transmitting data in an embodiment of the disclosure;
fig. 7 is a schematic diagram of different RV versions used for initial retransmission disclosed in an embodiment of the present application;
FIG. 8 is a diagram illustrating the determination of RV using TTI and HARQ process number according to an embodiment of the disclosure;
FIG. 9 is a schematic diagram of an apparatus according to an embodiment of the disclosure;
fig. 10 is a schematic structural diagram of another apparatus according to an embodiment disclosed in the present application.
Detailed Description
The terminology used in the description of the embodiments section of the present application is for the purpose of describing particular embodiments of the present application only and is not intended to be limiting of the present application.
The technical solutions in the embodiments of the present invention will be described below clearly with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.
It should be understood that in current cellular Communication systems, such as Global System for Mobile Communication (GSM) System, Wideband Code Division Multiple Access (WCDMA) System, Long Term Evolution (Long Term Evolution, LTE) System, etc., the supported Communication is mainly voice Communication and data Communication. Generally, a conventional base station supports a limited number of connections and is easy to implement.
Fig. 2 is a schematic diagram of a communication network to which an embodiment of the present invention is applied. As shown in fig. 2, the communication network 100 includes a network device 102 and terminal devices 104, 106, 108, 110, 112 and 114 (abbreviated as UEs in the figure), wherein the network device and the terminal devices are connected by a wireless connection or a wired connection or other means. It should be understood that fig. 2 only illustrates that the communication network 100 includes one network device, but the embodiment of the present invention is not limited thereto, for example, the communication network may include more network devices; similarly, the network may also comprise more terminal devices, and the network device may also comprise other devices.
The communication Network according to the embodiment of the present invention may refer to a Public Land Mobile Network (PLMN, which is simply referred to as "PLMN") or a Device to Device (D2D, which is simply referred to as "D2D") Network or an M2M Network or other networks, and fig. 1 is a simplified schematic diagram of an example, and other Network devices may also be included in the communication Network, which is not shown in fig. 2.
The terminal equipment in the embodiment of the invention is equipment with a wireless transceiving function, can be deployed on land, and comprises an indoor or outdoor, handheld, wearable or vehicle-mounted terminal; can also be deployed on the water surface (such as a ship and the like); and may also be deployed in the air (e.g., airplanes, balloons, satellites, etc.). The terminal device may be a mobile phone (mobile phone), a tablet computer (Pad), a computer with a wireless transceiving function, a Virtual Reality (VR) terminal device, an Augmented Reality (AR) terminal device, a wireless terminal in industrial control (industrial control), a wireless terminal in self driving (self driving), a wireless terminal in remote medical (remote medical), a wireless terminal in smart grid (smart grid), a wireless terminal in transportation safety (transportation safety), a wireless terminal in smart city (smart city), a wireless terminal in smart home (smart home), and the like. The embodiments of the present application do not limit the application scenarios. A terminal device may also be sometimes referred to as a User Equipment (UE), an access terminal device, a UE unit, a UE station, a mobile station, a remote terminal device, a mobile device, a UE terminal device, a wireless communication device, a UE agent, or a UE apparatus, etc. An access terminal may be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with Wireless communication capability, a computing device or other processing device connected to a Wireless modem, a vehicle mounted device, a wearable device, a terminal device in a future 5G network or a terminal device in a future evolved PLMN network, etc.
The Network device in the embodiment of the present invention may be a device for communicating with a terminal device, where the Network device may be a Base Transceiver Station (BTS) in a Global System for Mobile Communication (GSM) System or a Code Division Multiple Access (CDMA) System, may also be a Base Station NodeB (NB) in a Wideband Code Division Multiple Access (WCDMA) System, may also be a wireless controller in a Cloud Radio Access Network (CRAN) scenario, or may be a relay Station, a vehicle-mounted device, or a wireless controller in a wireless Node B (eNB) in a Long Term Evolution (LTE) System, or may also be a wireless controller in a CRAN scenario, Wearable devices, and network devices in future 5G networks or network devices in future evolved PLMN networks, etc.
In the present application, the Grant-Free transmission is directed to uplink data transmission, and the transmission may be denoted by Grant-Free transmission in english. The unlicensed transmission may refer to: the terminal equipment can realize a transmission mode of uplink data transmission without dynamic scheduling and/or explicit authorization of the network equipment. In the unlicensed transmission, when the terminal device has an uplink data transmission requirement each time, it does not need to send a scheduling request to the base station, and does not need to obtain scheduling information of the base station responding to the scheduling request, but may directly send uplink data by using a predefined or pre-allocated transmission resource of the network device, and the network device detects the uplink data sent by the terminal device on the predefined or pre-allocated transmission resource. The detection may be blind detection, or detection according to a certain control field in the uplink data, or detection in other manners.
The scheduling information may refer to: the network device receives an uplink scheduling request sent by the terminal device, and then sends an uplink grant to the terminal device, wherein the uplink grant indicates transmission resources allocated to the terminal device for uplink transmission.
The transmission resource may include a physical resource for uplink data transmission. The physical resource refers to a time-frequency resource defined by one or more transmission time units in the time domain and a frequency band of a certain size in the frequency domain. One transmission time unit may refer to a minimum time unit of one transmission, and may be one slot (slot), or one micro-slot (mini-s-lot), or one subframe (sub-frame), or one Transmission Time Interval (TTI), or N symbols (e.g., N OFDM symbols). The TTI size may be 1ms, and may be a predetermined or predefined value. The size of the frequency band may be represented by a bandwidth representation manner in an existing communication system (e.g., an LTE communication system), for example, the size may be represented by the number of subcarriers, the number of Resource Blocks (RBs), the number of subbands, or the like.
The transmission resources may also include, but are not limited to, a combination of one or more of the following:
spatial domain resources such as transmit antennas, beams, etc.;
code domain resources such as Sparse Code Multiple Access (SCMA) codebooks, Low Density Signature (LDS) sequences, CDMA codes, etc.;
-an uplink pilot resource. The uplink pilot resource includes a reference signal sequence, for example, a demodulation reference signal (DMRS) sequence, a Preamble (Preamble) sequence, or a Sounding reference signal (Sounding RS) sequence.
In the present application, the above-mentioned transmission resource for the unlicensed transmission is also referred to as an unlicensed resource.
With reference to the above system and application scenarios, the following describes embodiments of methods disclosed in embodiments of the present application.
The data transmission method disclosed by the embodiment of the application can comprise the following steps:
as shown in fig. 3, in step S301, the network device generates a configuration message, where the configuration message includes: one or more hybrid automatic repeat request (HARQ) process numbers, wherein each HARQ process number corresponds to one or more unlicensed transmission resources; the configuration message is used for configuring one or more authorization-free transmission resources for the terminal equipment in each time domain period.
Step S302, the network device sends the configuration message to a terminal device.
Specifically, each HARQ process number is used to identify one HARQ process.
In some possible implementations, the configuration message includes: one or more resource configuration messages; each resource configuration message is used for configuring a HARQ process number for the terminal equipment and configuring one or more authorization-free transmission resources in each time domain period.
In some possible implementations, each resource configuration message at least includes: frequency resource location information of each unlicensed transmission resource and location information of time domain resources within each time domain period.
Further, the location information of the frequency resource includes: physical resource block-starting position Prb-Start and/or physical resource block-ending position Prb-End.
In some possible implementations, the configuration message further includes: and the redundancy version configuration information is used for indicating that the terminal equipment adopts a fixed redundancy version or a variable redundancy version when transmitting data.
The configuration message and the like in the embodiment of the present application will be specifically described below with reference to fig. 4 and 5.
In the following, a network device is taken as a base station, and a terminal device is taken as a UE for example, to specifically describe. The base station configures one or more unlicensed transmission resources for the UE in each time domain period, where one time domain period may include one or more TTIs. And the base station appoints the HARQ process number corresponding to each unlicensed transmission resource in the configuration message.
As shown in fig. 4 and 5, the base station configures N subbands (shown by an ordinate f in fig. 3 and 4) for the UE in the frequency domain, where N is an integer greater than or equal to 1. For example, in fig. 3 and 4, 4 sub-bands are configured for the UE in the frequency domain, and the numbers of the sub-bands corresponding to the 4 sub-bands are respectively sub-band 1, sub-band 2, sub-band 3, and sub-band 4 (shown by ordinate f and not specifically illustrated). The configured bandwidth of each sub-band may be the same or different, where the different sub-bands do not overlap in the frequency domain. In the embodiment of the present application, the abscissa indicates that one timeslot may be a Time Transmission unit, for example, one timeslot may be a Transmission Time Interval (TTI), and the TTI may be a minimum Time unit for data Transmission, or a minimum Time unit for data scheduling, and the Time length of the TTI is 1 millisecond or 0.5 millisecond. The time lengths of the time slots in fig. 4 and 5 are merely illustrative and are not limiting to the present application. In the embodiment of the present application, one or more consecutive time slots in a time domain and a block of time-frequency resources defined by a sub-band in a frequency domain are determined as an unlicensed resource (GF Partition). In fig. 4 and fig. 5, a time-frequency resource defined by one time slot and one sub-band is taken as an example of an unlicensed resource. The allocation time periods (P _ n) of the sub-bands to the unlicensed resources may be the same or different. The configuration period of the unlicensed resources can be understood as the time interval between two adjacent unlicensed resources on the sub-band. As shown in fig. 4, the configuration periods of the sub-bands 1 to 4 for the unlicensed resources are all the same and are all 1, that is, the sub-bands 1 to 4 are configured with the unlicensed resources on each time slot, where the configuration periods of the unlicensed resources between the sub-bands may be the same.
As shown in fig. 4 and fig. 5, 4 unlicensed transmission resources correspond to 4 HARQ process numbers, HARQ process numbers ID are 0, 1, 2, and 3, and each HARQ process number corresponds to one HARQ process.
The difference between fig. 4 and fig. 5 is that, as shown in fig. 4, the base station configures 4 unlicensed transmission resources for the UE in each TTI, the frequency domain locations of the resources are different, and unlicensed transmission can be performed in 4 consecutive TTIs in fig. 4. However, only two TTIs shown in fig. 5 may be allowed to perform the unlicensed transmission, for example, the abscissa starts from left to right and starts from 0, the 0 th TTI and the 2 nd TTI have two unlicensed transmission resources that may be allowed to perform the unlicensed transmission, and there is no unlicensed transmission in the 1 st TTI and the 3 rd TTI, so that it is not always necessarily supported that each TTI may be allowed to perform the unlicensed transmission.
The base station allocated to the UE based on the base station in fig. 4 or fig. 5 sends a configuration message to the UE, and configures one or more unlicensed transmission resources for the UE in each TTI, where the base station specifies a HARQ process number corresponding to each unlicensed transmission resource in the configuration message. Specifically, the format of the configuration message sent by the base station, based on the above description of fig. 4 and fig. 5, is as follows: information such as a time domain position, a frequency domain position, an HARQ process number, and the like of each unlicensed transmission resource may be enumerated;
wherein maxg resources represents the maximum supportable number of the unlicensed transmission resources, for example, the value of fig. 4 or fig. 5 is 4. It should be noted that the maximum supportable number of unlicensed transmission resources is not sent to the UE through a configuration message.
For each resource configuration message, the Prb-Start physical resource block-starting position is an integer with a value between 0 and 99, and represents the starting position of the frequency domain resource, and a specific value corresponds to the number of one physical resource block Prb; if the value is 0, the No. 0 physical resource block is represented; the Prb-End is also an integer with a value between 0 and 99, and represents the termination position of the frequency domain resource, and the specific value corresponds to the number of one physical resource block Prb; if the value is 3, the No. 3 physical resource block is represented; the subframe bitmap is a bit string with a length of 4, and represents a configuration situation of time domain resources, and corresponds to which TTIs in every 4 TTIs can be used for unlicensed transmission, where 1 represents that the TTI can be used for unlicensed transmission resources, and 0 represents that the TTI cannot be used for unlicensed transmission resources, that is, data can be transmitted in the TTI of 1; for example, TTI number 1010 of fig. 3 indicates that TTI number 0 and TTI number 1 are available for unlicensed transmission; the harqID is an integer between 0 and 7, and represents the HARQ process number ID0-ID1 corresponding to the current unlicensed resource.
For the above mentioned, the configuration message comprises: one or more resource configuration messages; each resource configuration message is used to configure a HARQ process number for the terminal device and configure one or more grant-free transmission resources in each time domain period, where the format of each resource configuration message also refers to the message formats of the configuration messages in fig. 4 and fig. 5 and examples, and details are not repeated here.
S303, the terminal equipment receives the configuration message sent by the network equipment.
S304, the terminal equipment determines one or more unlicensed transmission resources for transmitting data in the current transmission time interval TTI according to the corresponding relation between the HARQ process number and the unlicensed transmission resources;
s305, the terminal equipment sends the data through the determined authorization-free transmission resource.
For any TTI, the terminal device takes UE as an example, as shown in fig. 4, the UE has 4 unlicensed transmission resources, the 4 unlicensed transmission resources correspond to 4 HARQ process numbers, and the HARQ process numbers ID are 1, 2, 3, and 4, respectively. Fig. 6 shows a schematic diagram of data transmission received by the UE, when new data arrives at the UE, the UE has 4 HARQ processes, where two data are being transmitted in HARQ process 0 and HARQ process 1, and no data is being transmitted in HARQ process 2 or HARQ process 3, and at this time, the UE may select HARQ process 2 or HARQ process 3 from the 4 HARQ processes to transmit new data. And if no idle HARQ process exists, selecting the transmission-free resource corresponding to one HARQ process to transmit new data after the data transmission of the HARQ process is finished, wherein each HARQ process is identified by the HARQ process number.
In another possible embodiment, if the terminal device receives a configuration message sent by the network device, the configuration message includes: frequency resource location information for each unlicensed transmission resource, the method further comprising:
and the terminal equipment determines the HARQ process number corresponding to each unlicensed transmission resource according to the frequency resource position information of each unlicensed transmission resource.
And the terminal equipment determines one or more unlicensed transmission resources used for transmitting data in the current TTI according to the determined corresponding relation between the HARQ process number and the unlicensed transmission resources.
And the terminal equipment transmits the data through the determined authorization-free transmission resource.
The specific process of determining, by the UE, the HARQ process number corresponding to each unlicensed transmission resource according to the frequency resource location information of each unlicensed transmission resource is described as follows:
as shown in fig. 4, it is assumed that the base station configures 4 unlicensed transmission resources for the terminal, and specifies HARQ processes for the 4 unlicensed transmissions, where the HARQ processes are specified according to a sequence (ascending or descending), for example, ascending or descending, and the sequence corresponding to the HARQ processes is: ID0 to ID 3. Each unlicensed transmission resource may be configured according to a frequency start location. If the base station configures 2 unlicensed transmission resources for the UE, and the frequency domain starting positions are 10 and 20, the HARQ process numbers corresponding to the ascending order are 0 and 1, respectively. And the UE receives the configuration message, and determines the HARQ process number corresponding to each unlicensed transmission resource to be 0 and 1 according to the frequency resource position information 10 and 20 of the unlicensed transmission resource in the configuration message.
Here, it should be noted that the location information of the frequency resource includes: physical resource block-starting position Prb-Start and/or physical resource block-ending position Prb-End. The specific location information is already described in the configuration message, and will not be described herein. The UE may determine, according to the physical resource block-Start position Prb-Start or physical resource block-End position Prb-End of the location information and the maximum transmission number of the unlicensed transmission resource, the HARQ process number corresponding to the unlicensed transmission resource according to the sequence of the HARQ processes, for example, ascending order or descending order. For example, the base station configures 2 unlicensed transmission resources for the UE, and if the physical resource block-starting position Prb-Start is 10, the corresponding HARQ process numbers are respectively 0 and 1 according to ascending order, and the UE receives the configuration message and determines, according to the frequency resource location information 10 of the unlicensed transmission resources in the configuration message, that the HARQ process number corresponding to each unlicensed transmission resource is 0, thereby implementing that the UE can also accurately determine the HARQ process number corresponding to the unlicensed transmission resource through the location information of the frequency resources in the configuration message.
In another optional embodiment, the network device corresponds the resource configuration message to HARQ process numbers, and each HARQ process number corresponds to a resource configuration message. The terminal equipment receives the resource configuration message and determines the HARQ process number according to the sending sequence of the resource configuration message. If the configuration message format example is adopted, one authorization-free configuration message GrantFree-Config comprises K resource configuration messages GFResources, and HARQ processes 0 to K-1 can be respectively corresponding to the sequence of the GFResources in the GrantFree-Config.
In an optional implementation manner, if the configuration message generated by the network device, for example, the base station in S301, further includes: and the redundancy version configuration information is used for indicating that the terminal equipment adopts a fixed redundancy version or a variable redundancy version when transmitting data. The method may further comprise:
and the terminal equipment determines to adopt a fixed redundancy version or a variable redundancy version when transmitting data according to the redundancy version configuration information.
The fixed redundancy version refers to that the UE adopts the same redundancy version in different TTIs or all TTIs; the variable redundancy versions are different redundancy versions used in different TTIs.
After the base station configuration is completed, the HARQ process number corresponding to each unlicensed transmission resource is known, and when receiving the data of the UE, the base station first determines the HARQ process number of the data and then performs signal detection (the process of detection and process number may not be limited). If the data is retransmission data, the data and the previous received signals are combined and detected, and if the data is initial transmission data, the data is directly detected, and then the data is analyzed. And if the detection is successful, sending an acknowledgement message ACK to the UE, otherwise, sending a negative acknowledgement message NACK, wherein the ACK/NACK message corresponds to 1 bit. If there are multiple parallel HARQ transmissions, the base station sends a multi-bit feedback message to the UE, corresponding to multiple HARQ processes.
The HRAQ process number has a corresponding relationship with the redundancy version RV of the data, and is specifically described as follows:
sending a redundancy version RV of data corresponding to the HRAC process number in the configuration information issued by the base station to the base station;
as shown in fig. 7, when the UE retransmits a data several times, a different coding scheme, i.e. a redundancy version number RV, may be used. For unlicensed transmissions, the base station may not detect the initial transmission but only the retransmission and may not be able to determine that it is currently the second retransmission. If a different redundancy version RV is used for each transmission, it is difficult for the base station to determine the currently used RV at reception and to detect data. As shown in fig. 4 and fig. 5, if all transmissions use a fixed redundancy version, for example, RV0, RV0 identifies an RV with a fixed version of 0, and all transmissions use the same redundancy version RV0, the base station does not need to judge the redundancy version during detection, thereby greatly reducing the complexity of the receiver.
Optionally, in another embodiment, the base station sends redundancy version configuration information to the UE, and if the redundancy version configuration information includes the same or different redundancy versions, for example: 0 is the same redundancy version, 1 is different redundancy version, and the UE determines to use the same redundancy version or different redundancy versions according to the redundancy version configuration information. If different redundancy versions are used, according to the following embodiments, the UE may determine the redundancy version used in the unlicensed transmission according to the correspondence between the TTI number and the redundancy version; or the UE determines the redundancy version used in the authorization-free transmission according to the corresponding relation between the TTI number, the HARQ process number and the redundancy version. Both cases are described in particular by the following examples.
Fig. 8 differs from fig. 4 and 5 described above in that the redundancy version employed in fig. 8 is different, whereas both fig. 4 and 5 employ a fixed redundancy version. The main difference between the embodiments described below and the above embodiments is that the redundancy versions of the unlicensed transmission may differ.
As shown in fig. 8, since the UE may transmit uplink data on any one unlicensed transmission resource, and may perform repeated transmission on multiple TTIs.
The first method comprises the following steps: the process for the UE to determine the current redundancy version according to the TTI number is as follows:
as shown in fig. 8, the current redundancy version may be determined according to TTI numbers, where the TTI numbers are 4n, 4n +1, 4n +2, 4n +3, which correspond to redundancy version numbers 0, 1, 2, and 3, respectively. When TTI number is nTTIThe corresponding formula can be expressed as:
RV＝mod(nTTI，4)
since the redundancy version number is tied to the TTI number, and the UE may start unlicensed transmission at any TTI, the redundancy version 0 is not necessarily selected for initial transmission. As shown in fig. 8, if the UE starts unlicensed transmission in the 4n +1 th TTI, the TTI number is modulo according to the above corresponding relationship between the TTI number and the RV, for example, the above formula, so that it can be determined that the redundancy version 1 will be used when the data is initially transmitted. It should be noted that the above formula is not unique, and the redundancy version may be determined by the correspondence between the TTI number and the RV.
And the second method comprises the following steps: the UE redundancy version number can also be determined jointly according to the TTI number and the HARQ process number:
as shown in FIG. 8, when the HARQ process number is nHARQ，IDThe corresponding formula can be expressed as:
RV＝mod(nTTI+nHARQ，ID，4)
at this time, the UE may select the unlicensed transmission resource corresponding to redundancy version 0 to start transmission every TTI, for example, as shown in fig. 8, if the UE starts unlicensed transmission in the 4n +1 th TTI, and selects the unlicensed transmission resource corresponding to HARQ process 4 to perform transmission: the nTTI is 4n, and the nHARQ ID is 0, then the corresponding redundancy version obtained according to the above formula is 0, it should be noted that the above formula is not unique, as long as the redundancy version can be determined through the correspondence between the TTI number and the RV. In addition, the above is only an embodiment, if the TTI is 4n, etc., the value of n may be an integer, and n may take any value of the integer.
In summary, by determining various corresponding relationships among the HARQ process number, the redundancy version, the unlicensed transmission resource, and the like, the problem that the base station cannot determine the HARQ process number used by the terminal device to send data due to misjudging the retransmission times of the data, and further cannot decode the data is solved, the base station can successfully demodulate the data when receiving the unlicensed transmission data, and the complexity of the receiver is reduced.
An embodiment of the apparatus provided in the present invention includes a network device and a terminal device, and is specifically applied to the system architecture diagram shown in fig. 2, where the schematic structural diagram of the data communication device is shown in fig. 9, specifically a schematic structural diagram of a connection between a processing unit and a transceiver unit, and the exemplary structural diagram may be applicable to a network device on a network side, such as a base station, and may also be applicable to a terminal device, such as a UE. The processing unit may be a processor as shown in fig. 10, and the transceiver unit may be a data transceiver or a communication interface for data transceiving as shown in fig. 10.
When the network device shown in fig. 9 is, the network device includes:
a first processing unit configured to generate a configuration message, the configuration message including: one or more hybrid automatic repeat request (HARQ) process numbers, wherein each HARQ process number corresponds to one or more unlicensed transmission resources; wherein the configuration message is used for configuring one or more unlicensed transmission resources for the terminal device in each time domain period
The first transceiving unit is used for sending the configuration message.
Optionally, the configuration message includes: one or more resource configuration messages; each resource configuration message is used for configuring a HARQ process number for the terminal equipment and configuring one or more authorization-free transmission resources in each time domain period.
Optionally, each resource configuration message at least includes: frequency resource location information of each unlicensed transmission resource and location information of time domain resources within each time domain period.
Optionally, the configuration message further includes: and the redundancy version configuration information is used for indicating that the terminal equipment adopts a fixed redundancy version or a variable redundancy version when transmitting data.
When the terminal device shown in fig. 9 is the terminal device, the terminal device includes:
a second transceiver unit, configured to receive a configuration message sent by a network device, where the configuration message includes: one or more hybrid automatic repeat request (HARQ) process numbers, wherein each HARQ process number corresponds to one or more unlicensed transmission resources; the configuration message is used for configuring one or more authorization-free transmission resources for the terminal equipment in each time domain period; and transmitting the data through the determined unlicensed transmission resource according to the indication of the second processor.
A second processing unit, configured to determine, according to a corresponding relationship between the HARQ process number and the unlicensed transmission resource, one or more unlicensed transmission resources used for transmitting data in a current transmission time interval TTI; instructing the second transceiver to transmit the data over the determined unlicensed transmission resources.
Optionally, the configuration message includes: one or more resource configuration messages; each resource configuration message is used for configuring a HARQ process number for the terminal equipment and configuring one or more authorization-free transmission resources in each time domain period.
Optionally, each resource configuration message at least includes: frequency domain resource location information of each unlicensed transmission resource and location information of time domain resources within each time domain period.
Optionally, the configuration message further includes: and the redundancy version configuration information is used for indicating that the terminal equipment adopts a fixed redundancy version or a variable redundancy version when transmitting data.
Optionally, the second processing unit is further configured to determine, according to the redundancy version configuration information, that a fixed redundancy version or a variable redundancy version is used when data is transmitted.
An embodiment of the present invention further provides a terminal device, where the terminal device includes:
a third transceiving unit, configured to receive a configuration message sent by a network device, where the configuration message includes: frequency resource location information for each unlicensed transmission resource; the data is sent through the determined authorization-free transmission resource according to the indication of the third processing unit;
a third processing unit, configured to determine, according to frequency resource location information of each unlicensed transmission resource, an HARQ process number corresponding to each unlicensed transmission resource; determining one or more unlicensed transmission resources used for transmitting data in the current TTI according to the corresponding relation between the determined HARQ process number and the unlicensed transmission resources; instructing the third transceiving unit to transmit the data through the determined unlicensed transmission resource.
Optionally, the configuration message further includes: and the redundancy version configuration information is used for indicating that the terminal equipment adopts a fixed redundancy version or a variable redundancy version when transmitting data.
Optionally, the third processing unit is further configured to determine, according to the redundancy version configuration information, that a fixed redundancy version or a variable redundancy version is used when data is transmitted.
An embodiment of the present invention further provides a data transmission device, which includes a memory, a processor, and a computer program stored in the memory and executable by the processor, where the processor executes the computer program to implement the steps of the data transmission method executed by the network device in the foregoing embodiment.
The embodiment of the present invention further provides a data transmission device, which includes a memory, a processor, and a computer program stored in the memory and executable by the processor, where the processor executes the computer program to implement the steps of the data transmission method executed by the terminal device.
An embodiment of the present application provides a data communication system, including: the network device comprises the network device described in the device embodiments and the terminal device described in the device embodiments. Please refer to fig. 2 for a specific system structure diagram.
It should be noted that the various devices described above can also perform corresponding part or all of the methods described in the foregoing method embodiments, and since the functions performed by the specific units of the network device, the terminal device, or the data transmission device are substantially the same as those described in the foregoing method embodiments, the hardware structures on which the functional units are based may be referred to in fig. 2 to fig. 8 and the corresponding descriptions of the corresponding illustrated embodiments above. And will not be described in detail herein.
In summary, by determining various corresponding relationships among the HARQ process number, the redundancy version, and the unlicensed transmission resource, the problem that the base station cannot determine the HARQ process number used by the terminal device to transmit data and cannot decode the data due to misjudging the retransmission times of the data is solved, the base station can successfully demodulate the data when receiving the unlicensed transmission data, and the complexity of the receiver is reduced.
One of ordinary skill in the art will appreciate that all or part of the processes in the methods of the above embodiments may be implemented by hardware related to instructions of a computer program, which may be stored in a computer-readable storage medium, and when executed, may include the processes of the above method embodiments. And the aforementioned storage medium includes: various media capable of storing program codes, such as ROM or RAM, magnetic or optical disks, etc.
Claims (25)
1. A method of data transmission, comprising:
a network device generates a configuration message, the configuration message comprising: one or more hybrid automatic repeat request (HARQ) process numbers, wherein each HARQ process number corresponds to one or more unlicensed transmission resources; the configuration message is used for configuring one or more authorization-free transmission resources for the terminal device in each time domain period, and the authorization-free transmission refers to: the terminal equipment realizes a transmission mode of uplink data transmission without dynamic scheduling and/or explicit authorization of the network equipment;
the network equipment sends the configuration message to terminal equipment;
wherein the configuration message comprises: one or more resource configuration messages; each resource configuration message is used for configuring a HARQ process number for the terminal equipment and configuring one or more authorization-free transmission resources in each time domain period.
2. The method according to claim 1, wherein each resource configuration message comprises at least: frequency resource location information of each unlicensed transmission resource and location information of time domain resources within each time domain period.
3. The method of any of claims 1-2, wherein the configuration message further comprises: and the redundancy version configuration information is used for indicating that the terminal equipment adopts a fixed redundancy version or a variable redundancy version when transmitting data.
4. A method of data transmission, the method comprising:
the method comprises the following steps that terminal equipment receives configuration information sent by network equipment, and the configuration information comprises: one or more hybrid automatic repeat request (HARQ) process numbers, wherein each HARQ process number corresponds to one or more unlicensed transmission resources; the configuration message is used for configuring one or more authorization-free transmission resources for the terminal device in each time domain period, and the authorization-free transmission refers to: the terminal equipment realizes a transmission mode of uplink data transmission without dynamic scheduling and/or explicit authorization of the network equipment;
the terminal equipment determines one or more authorization-free transmission resources used for transmitting data in a current transmission time interval TTI according to the corresponding relation between the HARQ process number and the authorization-free transmission resources;
the terminal equipment transmits the data through the determined authorization-free transmission resource;
wherein the configuration message comprises: one or more resource configuration messages; each resource configuration message is used for configuring a HARQ process number for the terminal equipment and configuring one or more authorization-free transmission resources in each time domain period.
5. The method according to any of the claims 4, wherein each resource configuration message comprises at least: frequency domain resource location information of each unlicensed transmission resource and location information of time domain resources within each time domain period.
6. The method of any of claims 4-5, wherein the configuration message further comprises: and the redundancy version configuration information is used for indicating that the terminal equipment adopts a fixed redundancy version or a variable redundancy version when transmitting data.
7. The method of claim 6, wherein the method comprises:
and the terminal equipment determines to adopt a fixed redundancy version or a variable redundancy version when transmitting data according to the redundancy version configuration information.
8. A method of data transmission, the method comprising:
the method comprises the following steps that terminal equipment receives configuration information sent by network equipment, and the configuration information comprises: frequency resource location information for each unlicensed transmission resource;
the terminal equipment determines an HARQ process number corresponding to each unlicensed transmission resource according to the frequency resource position information of each unlicensed transmission resource;
determining one or more unlicensed transmission resources for transmitting data in the current TTI according to the determined corresponding relationship between the HARQ process number and the unlicensed transmission resources, wherein the unlicensed transmission is for uplink data transmission, and the unlicensed transmission refers to: the terminal equipment realizes a transmission mode of uplink data transmission without dynamic scheduling and/or explicit authorization of the network equipment;
and the terminal equipment transmits the data through the determined authorization-free transmission resource.
9. The method of claim 8,
the configuration message further comprises: and the redundancy version configuration information is used for indicating that the terminal equipment adopts a fixed redundancy version or a variable redundancy version when transmitting data.
10. The method of claim 9, wherein the method comprises:
and the terminal equipment determines to adopt a fixed redundancy version or a variable redundancy version when transmitting data according to the redundancy version configuration information.
11. A network device, comprising:
a first processing unit configured to generate a configuration message, the configuration message including: one or more hybrid automatic repeat request (HARQ) process numbers, wherein each HARQ process number corresponds to one or more unlicensed transmission resources; wherein the configuration message is used for configuring one or more unlicensed transmission resources for the terminal device in each time domain period
A first transceiving unit for transmitting a configuration message;
wherein the configuration message comprises: one or more resource configuration messages; each resource configuration message is used for configuring a HARQ process number for the terminal equipment and configuring one or more authorization-free transmission resources in each time domain period.
12. The network device of claim 11,
each resource configuration message at least comprises: frequency resource location information of each unlicensed transmission resource and location information of time domain resources within each time domain period.
13. The network device of claims 11-12, wherein the configuration message further comprises: and the redundancy version configuration information is used for indicating that the terminal equipment adopts a fixed redundancy version or a variable redundancy version when transmitting data.
14. A terminal device, characterized in that the terminal device comprises:
a second transceiver unit, configured to receive a configuration message sent by a network device, where the configuration message includes: one or more hybrid automatic repeat request (HARQ) process numbers, wherein each HARQ process number corresponds to one or more unlicensed transmission resources; the configuration message is used for configuring one or more authorization-free transmission resources for the terminal equipment in each time domain period; and according to the instruction of the second processor, sending the data through the determined authorization-free transmission resource, wherein authorization-free transmission aims at uplink data transmission, and the authorization-free transmission refers to: the terminal equipment realizes a transmission mode of uplink data transmission without dynamic scheduling and/or explicit authorization of the network equipment;
a second processing unit, configured to determine, according to a corresponding relationship between the HARQ process number and the unlicensed transmission resource, one or more unlicensed transmission resources used for transmitting data in a current transmission time interval TTI; instructing the second transceiver to transmit the data over the determined unlicensed transmission resources;
wherein the configuration message comprises: one or more resource configuration messages; each resource configuration message is used for configuring a HARQ process number for the terminal equipment and configuring one or more authorization-free transmission resources in each time domain period.
15. The terminal device according to claim 14, wherein each resource configuration message comprises at least: frequency domain resource location information of each unlicensed transmission resource and location information of time domain resources within each time domain period.
16. The terminal device according to any of claims 14-15, wherein the configuration message further comprises: and the redundancy version configuration information is used for indicating that the terminal equipment adopts a fixed redundancy version or a variable redundancy version when transmitting data.
17. The terminal device according to any of claims 14-15, wherein the second processor is further configured to determine to use a fixed redundancy version or a variable redundancy version when transmitting data according to the redundancy version configuration information.
18. A terminal device, characterized in that the terminal device comprises:
a third transceiving unit, configured to receive a configuration message sent by a network device, where the configuration message includes: frequency resource location information for each unlicensed transmission resource; the data is sent through the determined authorization-free transmission resource according to the indication of the third processing unit;
a third processing unit, configured to determine, according to frequency resource location information of each unlicensed transmission resource, an HARQ process number corresponding to each unlicensed transmission resource; determining one or more unlicensed transmission resources used for transmitting data in the current TTI according to the corresponding relation between the determined HARQ process number and the unlicensed transmission resources; instructing the third transceiving unit to send the data through the determined authorization-free transmission resource, wherein authorization-free transmission is for uplink data transmission, and authorization-free transmission refers to: the terminal equipment realizes a transmission mode of uplink data transmission without dynamic scheduling and/or explicit authorization of the network equipment.
19. The any of the terminal devices of claim 18, wherein the configuration message further comprises: and the redundancy version configuration information is used for indicating that the terminal equipment adopts a fixed redundancy version or a variable redundancy version when transmitting data.
20. The terminal device according to any of claims 18-19, wherein the third processing unit is further configured to determine to use a fixed redundancy version or a variable redundancy version when transmitting data according to the redundancy version configuration information.
21. A data transmission device comprising a memory and a processor, and a computer program stored on the memory for execution by the processor, characterized in that:
the processor executes the computer program to implement the steps of the data transmission method according to any one of claims 1 to 3.
22. A data transmission device comprising a memory and a processor, and a computer program stored on the memory for execution by the processor, characterized in that:
the processor executes the computer program to implement the steps of the data transmission method according to any one of claims 4 to 7.
23. A data transmission device comprising a memory and a processor, and a computer program stored on the memory for execution by the processor, characterized in that:
the processor executes the computer program to implement the steps of the data transmission method according to any one of claims 8-10.
24. A data communication system comprising a network device according to any of claims 11-13 and a terminal device according to any of claims 14-17.
25. A data communication system comprising a network device according to any of claims 11-13 and a terminal device according to any of claims 18-20.
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| CN111988121A (en) * | 2019-05-24 | 2020-11-24 | 中国电信股份有限公司 | Data transmission method based on scheduling-free, base station, terminal and storage medium |
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| WO2021087805A1 (en) * | 2019-11-06 | 2021-05-14 | Oppo广东移动通信有限公司 | Method processing for split resources and processing device |
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