CN112448793A

CN112448793A - Method and device for transmitting hybrid automatic repeat request information

Info

Publication number: CN112448793A
Application number: CN201910829287.1A
Authority: CN
Inventors: 李晋声; 史满姣; 冯莉; 钟勤; 李迪; 张德贤
Original assignee: Potevio Information Technology Co Ltd
Current assignee: Potevio Information Technology Co Ltd
Priority date: 2019-09-03
Filing date: 2019-09-03
Publication date: 2021-03-05

Abstract

The embodiment of the invention provides a method and a device for transmitting hybrid automatic repeat request information, which utilize a pre-configured PSFCH resource pool to establish a corresponding relation between time domain resource information and frequency domain resource information of a PSFCH and a PSSCH, and indicate the PSFCH through the time frequency resource information of the PSSCH, so that the method and the device are a completely implicit indication mode. Resource conflict can be avoided, meanwhile, the signaling load is low, time delay is reduced, and resources are saved.

Description

Method and device for transmitting hybrid automatic repeat request information

Technical Field

The present invention relates to the field of wireless communication technologies, and in particular, to a method and an apparatus for transmitting harq information.

Background

Currently, the third Generation Partnership Project (3rd Generation Partnership Project, 3GPP) has completed phase V2X first phase research and introduced LTE-based V2X technology at release 14. The vehicles may exchange respective status information such as location, speed, and direction through the Sidelink. The 3GPP has completed the second phase study of V2X and introduced some new LTE-based Sidelink functionalities in release 15, such as carrier aggregation, higher order modulation, and short TTI based latency reduction techniques.

The LTE air interface based V2X Sidelink technologies studied in two stages of 3GPP all communicate on pre-allocated resources, do not support Hybrid Automatic Repeat Request (HARQ) technology, only support broadcast services, and cannot support multicast services (groupcast) and unicast services (unicast), i.e., cannot support class 4 typical application services supported by the 3GPP enhanced V2X technology summarized in the protocol TS 22.186.

The typical class 4 application service summarized in the protocol TS22.186 requires a great many support scenarios, and these different scenarios have wide delay, reliability and throughput requirements, and cannot be satisfied only by relying on the support of broadcast services, and in some scenarios, multicast services and unicast services need to be supported, which requires the introduction of HARQ technology to enhance the resource utilization. However, if HARQ information is carried on a physical direct link Control Channel (PSCCH) or a physical direct link shared Channel (PSCCH), resource waste and complex system design will be caused. Therefore, 3GPP decides to introduce an independent Physical Channel, i.e., a Physical downlink Feedback Channel (PSFCH), for feeding back HARQ information. In addition, considering that almost all V2X application scenarios have a relatively strict delay requirement relative to the common 5G service, processing overhead such as Cyclic Redundancy Check (CRC) and decoding is reduced, and a design mode similar to NR PUCCH format 0 based on sequence design is adopted to form a basis for PSFCH channel design.

From the V2X actual application scenario, there is a complication that multiple applications coexist. Therefore, when multiple receiving UEs feed back HARQ information at the same time, resource collision is to be avoided, that is, resource collision caused by multiple receiving UEs feeding back HARQ information at the same time using the same PSFCH is avoided. Avoiding resource collision is very important for normal operation of feeding back HARQ information. If the receiving UE correctly receives the data transmitted by the psch and the sending UE does not correctly obtain the feedback information due to resource collision, the sending UE retransmits the data, which results in unnecessary retransmission, resource waste and reduced spectrum efficiency. Moreover, if the receiving UE does not correctly receive the data transmitted by the psch, the transmitting UE also does not obtain correct feedback information due to resource collision, which results in a decrease in reliability of communication.

As shown in fig. 1, a schematic view of an eV2X scene for driving in 2 fleet groups, where the 2 fleet groups are fleet 1 and fleet 2 respectively, where fleet 1 includes 4 vehicles UE and fleet 2 includes 3 vehicles UE. From the practical application scenario shown in fig. 1, since there are many UEs in the eV2X system, although the basic application is team driving, advanced automatic driving technology and sensor application technology are probably applied thereto. Similarly, multiple services and multiple message concurrences, such as video image sharing and road condition information sharing, are normal application scenarios. Of course, a plurality of UEs are also in the transmitting and receiving states at the same time. In addition, the capability levels of different receiving UEs may be different, and the above situations also result in that many receiving UEs feed back HARQ information to the transmitting UE in the same time. If two or more receiving UEs feed back HARQ information to the transmitting UE at the same PSFCH, this will also constitute a resource collision.

In the prior art, in order to reduce resource collision, when a receiving UE performs HARQ information feedback to a sending UE, the sending UE generally needs to send a signaling to the receiving UE to indicate a PSFCH that needs to be used when the receiving UE feeds back HARQ information. However, the method for receiving the HARQ information feedback of the UE will cause a large signaling overhead to the communication system, and also increase the time delay, so that the resource occupation is large.

Therefore, it is desirable to provide a method and apparatus for harq information transmission.

Disclosure of Invention

To overcome the foregoing problems or at least partially solve the foregoing problems, embodiments of the present invention provide a method and an apparatus for transmitting harq information.

In a first aspect, an embodiment of the present invention provides a method for transmitting harq information, including:

at the time of sending hybrid automatic repeat request (HARQ) information, determining a target PSFCH from a pre-configured PSFCH resource pool based on the service type of the data information to be fed back corresponding to the HARQ information and a PSSCH (physical direct connection shared channel) in each time slot in a sending window of the data information to be fed back;

transmitting the HARQ information based on the target PSFCH;

the service types comprise unicast service and multicast service; the PSFCH resource pool comprises a unicast service sub-resource pool and a multicast service sub-resource pool, the unicast service sub-resource pool and the multicast service sub-resource pool both comprise a preset number of small resource pools, and the PSFCH in each small resource pool corresponds to a PSSCH (physical direct connection shared channel) in each time slot in a sending window of data information to be fed back.

Preferably, each time slot in the transmission window corresponds to a time slot number, and each PSFCH in the PSFCH resource pool corresponds to a PSFCH index number; correspondingly, the PSFCH in each small resource pool corresponds to the PSSCH of the physical direct connection shared channel in each timeslot in the transmission window of the data information to be fed back, and specifically includes:

for each small resource pool in the unicast service sub-resource pool, the PSFCH index number in each small resource pool is in one-to-one correspondence with the time slot number of the PSSCH in each time slot in the sending window and the starting subband number in the first time slot in the sending window;

for each small resource pool in the multicast service sub-resource pool, the PSFCH index number in each small resource pool is in one-to-one correspondence with the time slot number of the PSSCH in each time slot in the sending window, the starting subband number in the first time slot in the sending window and the serial number of the receiving user terminal for transmitting the HARQ information in the group.

Preferably, the determining, based on the service type of the data information to be fed back corresponding to the HARQ information and the pscch in each timeslot in the transmission window of the data information to be fed back, a target PSFCH from a pre-configured PSFCH resource pool includes:

if the service type is judged and known to be the unicast service, determining a target PSFCH index number corresponding to the target PSFCH from the unicast service sub-resource pool based on the time slot number of the PSSCH in each time slot in the sending window, the number of the PSSCHs in each time slot in the sending window, the maximum bearing capacity of a resource block to a receiving user terminal and a first random function;

if the service type is judged and known to be the multicast service, determining a target PSFCH index number corresponding to the target PSFCH from the unicast service sub-resource pool based on the time slot number of the PSSCH in each time slot in the sending window, the maximum bearing capacity of a resource block on the PSFCH, the sequence number of a receiving user terminal for transmitting the HARQ information in a group and a second random function;

wherein the input variables of the first random function and the second random function are: the time slot number of PSSCH in each time slot in the sending window, and the physical identification of the cell where the receiving user terminal for transmitting the HARQ information is located; the value range of the output variable of the first random function is 0 to the maximum bearing capacity of the resource block to the receiving user terminal minus 1; and the value range of the output variable of the second random function is 0 to 1.

Preferably, the ZC sequence used by the target PSFCH is an offset sequence of a base sequence.

Preferably, the sequence offset value of the offset sequence relative to the base sequence is specifically determined as follows:

if the service type is judged to be the unicast service, the sequence deviation value is determined based on the user identification of the receiving user terminal for transmitting the HARQ information in the cell;

and if the service type is judged to be the multicast service, determining the sequence deviation value based on the sequence number of the receiving user terminal transmitting the HARQ information in the group.

In a second aspect, an embodiment of the present invention provides a method for transmitting harq information, including:

receiving hybrid automatic repeat request (HARQ) information;

determining a receiving user terminal corresponding to the HARQ transmission based on a target PSFCH for transmitting the HARQ information and a pre-configured PSFCH resource pool of a physical direct connection feedback channel;

the PSFCH resource pool comprises two sub-resource pools, each sub-resource pool comprises a preset number of small resource pools, and the PSFCH in each small resource pool corresponds to the PSSCH of the physical direct connection shared channel in each time slot in the sending window to be fed back and identification information corresponding to a receiving user terminal for transmitting the HARQ information.

In a third aspect, an embodiment of the present invention provides a hybrid automatic repeat request information transmission apparatus, including: a target PSFCH determination module and a transmission module. Wherein the content of the first and second substances,

the target PSFCH determining module is used for determining a target PSFCH from a pre-configured PSFCH resource pool based on the service type of the data information to be fed back corresponding to the HARQ information and a PSSCH (physical direct connection shared channel) in each time slot in a sending window of the data information to be fed back at the time of sending hybrid automatic repeat request HARQ information;

the transmission module is used for transmitting the HARQ information based on the target PSFCH;

In a fourth aspect, an embodiment of the present invention provides a hybrid automatic repeat request information transmission apparatus, including: the device comprises an HARQ information receiving module and a terminal determining module. Wherein the content of the first and second substances,

the HARQ information receiving module is used for receiving hybrid automatic repeat request (HARQ) information;

the terminal determining module is used for determining a receiving user terminal corresponding to the HARQ transmission based on a target PSFCH for transmitting the HARQ information and a pre-configured PSFCH resource pool of a physical direct connection feedback channel;

In a fifth aspect, an embodiment of the present invention provides an electronic device, including: memory, processor and computer program stored on the memory and executable on the processor, the processor when executing the program implementing the steps of the hybrid automatic repeat request information transmission method according to the first aspect or the second aspect.

In a sixth aspect, an embodiment of the present invention provides a non-transitory computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements the steps of the hybrid automatic repeat request information transmission method according to the first aspect or the second aspect.

The method and the device for transmitting the hybrid automatic repeat request information provided by the embodiment of the invention utilize the pre-configured PSFCH resource pool to establish the corresponding relation between the PSFCH and the time domain resource information and the frequency domain resource information of the PSSCH, and indicate the PSFCH through the time frequency resource information of the PSSCH, so that the method and the device are a completely implicit indication mode. Resource conflict can be avoided, meanwhile, the signaling load is low, time delay is reduced, and resources are saved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.

FIG. 1 is a schematic diagram of a prior art eV2X scenario for 2 fleet group driving;

fig. 2 is a flowchart illustrating a transmission method of harq information according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of an exemplary application scenario of an NR eV2X in a transmission method for hybrid automatic repeat request information according to an embodiment of the present invention for receiving information sent by a user terminal;

fig. 4 is a flowchart illustrating a transmission method of harq information according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of an apparatus for transmitting harq information according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of an apparatus for transmitting harq information according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the embodiments of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have specific orientations, be configured in specific orientations, and operate, and thus, should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. Specific meanings of the above terms in the embodiments of the present invention can be understood in specific cases by those of ordinary skill in the art.

Currently, the 3GPP working group is formulating a New Radio (NR) technology-based Vehicle networking to evolution (V2X) direct link communication (Sidelink) protocol standard. Compared with Long Term Evolution (LTE) based V2X technology, NR V2X supports higher reliability lower latency communication transmission, with 99.999% reliability requirements and 3 ms latency requirements in some specific scenarios, which means that more stringent technical requirements will be met in NR V2X. In addition, 25 application scenarios that the 3GPP enhanced V2X technology needs to support are summarized in the protocol TS22.186, and these application scenarios can be classified into 4 types of typical application services, which are respectively Vehicle fleet Driving (Vehicle planning), Extended sensor technology (Extended Sensors), Advanced Driving technology (Advanced Driving), and Remote control Driving technology (Remote Driving), and these services are all unsupported by LTE-V2X.

Considering that V2X sildelink adopts a half-duplex mode, a User Equipment (UE) needs to perform multiple times of RX-TX (receive-transmit) and TX-RX (transmit-receive) switching for feeding back HARQ information, and HARQ information transmission needs to perform Automatic Gain Control (AGC) processing in consideration of a reserved time. In consideration of these overhead problems, the PSFCH resources are typically configured in a periodic configuration. In addition, considering the low latency requirement of V2X, the PSFCH resource configuration period may not be too large, and currently, 3GPP only specifies the configuration period of {1, 2, 4} slots.

Before feeding back the HARQ information using the PSFCH, the UE needs to know the PSFCH used by the UE. Considering the design of the PSFCH based on PUCCH format 0, the PSFCH includes time domain resource information, frequency domain resource information, and code domain resource information. The PSFCH and the PSSCH are always associated one-to-one, so a general simpler design mostly adopts implicit acquisition of the PSFCH time-frequency domain resource information according to the PSSCH time-frequency domain resource information. Considering the requirement of low delay of V2X and reducing the processing overhead of UE reception/decoding, determining the PSFCH time domain resource information according to the predefined PSFCH time interval relative to the PSSCH is a simple and reliable design method.

However, in the prior art, when the receiving UE feeds back the HARQ information to the sending UE through the determined PSFCH time-frequency domain resource information, a resource conflict may occur, and in order to reduce the resource conflict, when the receiving UE feeds back the HARQ information to the sending UE, the sending UE generally needs to send a signaling to the receiving UE to indicate the PSFCH that is needed when the receiving UE feeds back the HARQ information. However, the method for receiving the HARQ information feedback of the UE will cause a large signaling overhead to the communication system, and also increase the time delay, so that the resource occupation is large. Therefore, the embodiment of the invention provides a method and a device for transmitting hybrid automatic repeat request information.

As shown in fig. 2, an embodiment of the present invention provides a method for transmitting harq information, including:

s21, at the time of sending hybrid automatic repeat request (HARQ) information, determining a target PSFCH from a pre-configured PSFCH resource pool based on the service type of the data information to be fed back corresponding to the HARQ information and the PSSCH of the physical direct connection shared channel in each time slot in a sending window of the data information to be fed back;

s22, transmitting the HARQ information based on the target PSFCH;

Specifically, in the method for transmitting Hybrid Automatic Repeat Request (HARQ) information provided in the embodiment of the present invention, an execution main body is a receiving User Equipment (UE). The specific application scenarios are as follows: the sending UE loads the data information on a physical direct link shared Channel (psch) to send to the receiving UE, and the receiving UE needs to feed back a receiving result of the data information to the sending UE after receiving the data information, that is, the receiving result of the data information is fed back by transmitting HARQ information to the sending UE. When the receiving UE transmits HARQ information to the sending UE, the HARQ information needs to be carried on the PSFCH for transmission. Therefore, the embodiment of the present invention aims to determine which PSFCH is selected by the receiving UE for transmitting HARQ information. The HARQ information may specifically include: an Acknowledgement (ACK) signal and a Non-Acknowledgement (NACK) signal, and if the receiving UE receives the ACK signal correctly, the ACK signal is returned, and if the receiving UE receives the NACK signal incorrectly, the NACK signal is returned.

When receiving the HARQ information transmitted by the UE, the sending time of the HARQ information needs to be determined first, and the determining method of the sending time may specifically be: and determining the time slot number of the PSFCH required to be adopted for transmitting the HARQ information based on the time slot number of the last time slot corresponding to the PSSCH adopted by the transmitting UE and the time interval between the pre-configured PSSCH and the PSFCH, so as to obtain the transmitting time of the HARQ information. Wherein the time interval between the PSSCH and the PSFCH can be expressed by the number of slots.

Firstly, S11 is executed, and a target PSFCH is determined from a pre-configured PSFCH resource pool based on the service type of the data information to be fed back corresponding to the HARQ information and the PSSCH of the physical direct connection shared channel in each time slot in the sending window of the data information to be fed back when the UE receives the HARQ information sending time. Here, the data information to be fed back refers to, for the receiving UE, the data information sent by the sending UE, that is, the data information that whether the feedback reception of the receiving UE is correct or not needs to be received.

The service type of the data information to be fed back can include unicast service and multicast service, the unicast service means that one sending UE corresponds to one receiving UE, that is, the data information to be fed back sent by one sending UE can only be received by one receiving UE; the multicast service refers to that one sending UE corresponds to a group of receiving UEs, that is, data information to be fed back sent by one sending UE may be received by a group of receiving UEs. Since the data information to be fed back is transmitted through the PSSCH by the transmitting UE, the service type to which the data information to be fed back belongs is also the service type of the PSSCH.

When sending the data information to be fed back, the sending UE has a sending window, and the sending window is used for controlling the flow of the sending of the data information to be fed back. When receiving the HARQ information fed back by the UE, a feedback window corresponding to the sending window exists. The data in the sending window takes time slots as units, a plurality of time slots exist in each sending window, and the time slots in the sending windows can be sequenced according to time. The PSSCH in each slot takes a sub-band as a unit, and one sub-band corresponds to one PSSCH. That is, there may be multiple pschs, i.e., corresponding multiple PSFCHs, in each slot. In the embodiment of the invention, the PSFCH in each small resource pool corresponds to the PSSCH of the physical direct connection shared channel in each time slot in the sending window of the data information to be fed back.

In the embodiment of the present invention, when performing HARQ information transmission, a PSFCH Resource pool needs to be configured in advance, where the PSFCH Resource pool may use Resource Blocks (RBs) as a unit, and the Resource blocks may specifically include Physical Resource Blocks (PRBs) and Virtual Resource Blocks (VRBs). The PSFCH resource pool can bear N PSFCHs, and can be divided into two sub-resource pools according to needs, wherein one sub-resource pool is a unicast service sub-resource pool, and the PSFCH in the PSFCH is used for feeding back HARQ information of the receiving UE under the condition of unicast service transmission; the other is a multicast service sub-resource pool, in which the PSFCH is used for feeding back HARQ information of the receiving UE in case of multicast service transmission. The dividing mode of the sub-resource pool can be set according to needs, and the number of PSFCHs in each sub-resource pool can be determined according to business requirements, which is not specifically limited in the embodiment of the present invention. Each sub-resource pool is divided into a preset number D of small resource pools, where the preset number D refers to a PSFCH transmission period, and the PSFCH transmission period is in units of time slots, that is, each small resource pool corresponds to one time slot. For example, D may be 1, 2, and 4, that is, it means that each sub-resource pool is divided into 1, 2, and 4 small resource pools on average, and each sub-resource pool corresponds to 1, 2, and 4 time slots, respectively.

In the embodiment of the invention, the PSFCH in each small resource pool in the PSFCH resource pool corresponds to the PSSCH in each time slot in the sending window of the data information to be fed back, which means that the time domain resource information and the frequency domain resource information of the PSFCH and the PSSCH are in a corresponding relationship. Different time domain resource information and different frequency domain resource information of the PSSCH correspond to different PSFCHs. Therefore, after the PSSCH used for bearing the to-be-fed back data information sent by the sending UE is determined, the target PSFCH can be determined according to the corresponding relation between the PSSCH and the PSFCH.

Step S12 is then performed to transmit HARQ information based on the target PSFCH. Namely, the target PSFCH carries HARQ information corresponding to the data to be fed back, and the HARQ information is transmitted to the sending UE. The sending UE determines, according to the pre-configured PSFCH resource pool, a receiving UE corresponding to the PSFCH carrying the HARQ information, that is, the sending UE needs to determine which receiving UE feeds back the received HARQ information, so as to perform subsequent operations.

The transmission method of the hybrid automatic repeat request information provided by the embodiment of the invention utilizes the pre-configured PSFCH resource pool to establish the corresponding relation between the PSFCH and the time domain resource information and the frequency domain resource information of the PSSCH, and the PSFCH is indicated through the time frequency resource information of the PSSCH, so that the method is a completely implicit indication mode. Resource conflict can be avoided, meanwhile, the signaling load is low, time delay is reduced, and resources are saved.

On the basis of the foregoing embodiment, in the transmission method for hybrid automatic repeat request information provided in the embodiments of the present invention, each time slot in the transmission window corresponds to a time slot number, and the PSFCH in the PSFCH resource pool corresponds to a PSFCH index number; accordingly, the number of the first and second electrodes,

the PSFCH in each small resource pool corresponds to the PSSCH of the physical direct connection shared channel in each time slot in the transmission window of the data information to be fed back, and specifically includes:

Specifically, in the embodiment of the present invention, the time slots in the transmission window are numbered, each time slot is assigned with a time slot number, and if the transmission window includes M time slots, the M time slots can be numbered according to the time sequence. Taking M as an example, 10 slots may be numbered from 0 to 9 in chronological order. In addition, in the embodiment of the invention, the PSFCHs in the PSFCH resource pool are numbered, and each PSFCH is assigned with a PSFCH index number. The PSFCH resource pool is provided with N PSFCHs in total, and the PSFCHs can be numbered from 0 to N-1, so that each PSFCH in the PSFCH resource pool corresponds to one PSFCH index number. Different time domain resource information and different frequency domain resource information correspond to different PSFCH index numbers, so that the PSFCH index numbers contain the time domain resource information and the frequency domain resource information of the PSFCH.

From the aspect of application convenience, two consecutive segments or two consecutive segments of frequency resource spaces in RB units may be periodically configured as the PSFCH resource pool for periodic transmission, which are distributed symmetrically up and down and defined by Bandwidth partition (BWP). Each RB can theoretically carry 12 PSFCH sequences, which are composed of a certain base sequence and its offset sequence, and each sequence can be modulated by ACK and/or NACK information bits to constitute one PSFCH. Therefore, each PSFCH within the pool of PSFCH resources has a PSFCH index number. For the unicast mode, one PSFCH in the PSFCH feedback window corresponds to one PSSCH in the PSSCH transmission window. For the multicast mode, a set of pre-configured PSFCHs in the PSFCH feedback window all correspond to one PSSCH in the PSSCH transmission window.

For each small resource pool in the unicast service sub-resource pool, the PSFCH index number in each small resource pool is in one-to-one correspondence with the time slot number of the PSSCH in each time slot in the sending window and the starting subband number in the first time slot in the sending window. Here, the slot number of the psch in each slot, i.e., the code of the slot in which the psch is located, may represent time domain resource information of the psch. Since the width of each sub-band in the time slot is the same, for example, 25kHz, the sub-band number where each pscch is located in the transmission window can be determined according to the starting sub-band number in the first time slot in the transmission window, and the frequency domain resource information of the pscch can be characterized.

For each small resource pool in the multicast service sub-resource pool, the PSFCH index number in each small resource pool is in one-to-one correspondence with the time slot number of the PSSCH in each time slot in a sending window, the starting subband number in the first time slot in the sending window and the serial number of the receiving UE for transmitting the HARQ information in the group. Here, the sequence number of the receiving UE transmitting the HARQ information in the group refers to a corresponding sequence number of the receiving UE transmitting the HARQ information in a group of receiving UEs when the sending UE transmits the data information to be fed back to the group of receiving UEs on the PSSCH.

It should be noted that, in the embodiment of the present invention, the one-to-one correspondence may be any one-to-one correspondence in a strict mathematical sense, for example, the one-to-one correspondence may be a linear one-to-one correspondence, or may also be a nonlinear one-to-one correspondence, which is not limited in the embodiment of the present invention.

The following description will be given only by taking a linear one-to-one correspondence as an example.

For the unicast service condition, the one-to-one correspondence relationship between the PSFCH index number in each small resource pool in the unicast service sub-resource pool, the timeslot number of the PSSCH in each timeslot in the transmission window, and the starting subband number in the first timeslot in the transmission window may be represented as:

r＝N_mux*t_pssch*N_subCH+N_mux*n_subCH+f₁(t^* _pssch,cellId) (1)

wherein r is the PSFCH index number in each small resource pool; n is a radical of_muxThe maximum bearing capacity of the resource block to the receiving user terminal can be 3; t is t_psschThe PSSCH corresponding to the PSFCH in the sending window is numbered relative to the time slot of the window head of the sending window, and the value range can be 0 to D-1; n is a radical of_subCHThe number of PSSCH in each time slot in a sending window; n is_subCHThe starting sub-band number in the first time slot in the sending window is the starting sub-band number in the first time slot in the sending window; f. of₁(t^* _psschcellId) is a first random function with an input variable t^* _psschAnd cellId, t^* _psschIs t_psschThe corresponding actual time slot number and cellId are the physical identifier of the cell where the receiving UE corresponding to the PSFCH is located, that is, the physical identifier of the cell where the receiving UE transmitting the HARQ information is located. The output result of the first random function ranges from 0 to N_mux-1。

For the multicast service condition, the one-to-one correspondence relationship between the PSFCH index number in each small resource pool in the multicast service sub-resource pool and the timeslot number of the PSSCH in each timeslot in the transmission window, the starting subband number in the first timeslot in the transmission window, and the sequence number of the receiving user terminal transmitting HARQ information in the group can be represented as:

r＝rbase+t_pssch*N_subCH*N_cs+n_subCH*N_cs+2*nID_{RX_Group}+f₂(t^* _pssch,cellId) (2)

wherein r is the PSFCH index number in each small resource pool; n is a radical of_muxThe maximum bearing capacity of the resource block to the receiving user terminal can be 3 or 6; n is a radical of_csThe maximum carrying capacity of the resource block to the PSFCH can be 12;

the operation of rounding up is carried out; nID_{RX_Group}The sequence number of the receiving UE corresponding to the PSFCH in the group, that is, the sequence number of the receiving UE transmitting the HARQ information in the group; f. of₂(t^* _psschcellId) is a second random function with an input variable t^* _psschAnd cellId, t^* _psschIs t_psschAnd the corresponding actual time slot number and the cellId are the physical identification of the cell where the receiving UE corresponding to the PSFCH is located. The output result of the second random function ranges from 0 to 1.

It should be noted that, in NR, a maximum of 6 receiving user terminals are generally carried on resources in units of RBs, and when 2-bit ACK/NACK information is fed back, 3 receiving user terminals are generally carried.

Since the PSFCHs in the PSFCH resource pool are numbered, each PSFCH corresponds to one PSFCH index number, when the PSFCH resource pool is divided into two sub-resource pools, the PSFCH resource pool can be divided into two sub-resource pools according to the sequence of the PSFCH index numbers from low to high, so that the PSFCH index number in one sub-resource pool is lower than the PSFCH index number in the other sub-resource pool. Specifically, the PSFCH index number in the unicast service sub-resource pool is low, or the PSFCH index number in the multicast service sub-resource pool is low, which is not specifically limited in the embodiment of the present invention.

On the basis of the foregoing embodiment, the method for transmitting HARQ information according to the hybrid automatic repeat request provided in the embodiment of the present invention, where the target PSFCH is determined from a pre-configured PSFCH resource pool based on the service type of the data information to be fed back corresponding to the HARQ information and the PSSCH of the physical direct connection shared channel in each timeslot in the transmission window of the data information to be fed back, specifically includes:

Specifically, in the embodiment of the present invention, when determining the target PSFCH, if the service type to which the data information to be fed back corresponding to the HARQ information belongs is a unicast service, the target PSFCH is determined in the unicast service sub-resource pool, that is, the index number of the target PSFCH is determined by the above formula (1). And if the service type of the data information to be fed back corresponding to the HARQ information is the multicast service, determining a target PSFCH in the multicast service sub-resource pool, namely determining the index number of the target PSFCH through the formulas (2) and (3).

Based on the foregoing embodiments, in the transmission method of hybrid automatic repeat request information provided in the embodiments of the present invention, the ZC sequence used by the target PSFCH is an offset sequence of a base sequence.

Specifically, in the embodiment of the present invention, the ZC sequence is used to characterize code domain resource information used by the target PSFCH, and specifically, the ZC sequence may be an offset sequence of a base sequence, the base sequence may be selected in advance, the offset sequence is obtained by offsetting the base sequence by a certain value, and the certain value is an offset value. The specific value of the offset value may be determined as needed, and is not specifically limited in the embodiment of the present invention.

On the basis of the foregoing embodiment, in the transmission method for hybrid automatic repeat request information provided in the embodiment of the present invention, the sequence offset value of the offset sequence with respect to the base sequence is specifically determined as follows:

Specifically, under the unicast service condition, the sequence offset value may be determined by the PSFCH index number and the user identifier of the receiving UE, and specifically may be determined based on the maximum bearer amount of the resource block to the PSFCH, the target PSFCH index number, and the third random function; the input variables of the third random function are: the time slot number of PSSCH in each time slot in the sending window, the user identification of the receiving user terminal transmitting the HARQ information in the cell and the physical identification of the cell where the receiving user terminal transmitting the HARQ information is located. As shown in equation (4).

a＝mod(mod(r,N_cs)+f₃(t^* _pssch,uid,cellId),N_cs) (3)

Wherein a is the sequence offset value, uid is the user identification of the receiving UE transmitting HARQ information in the cell, f₃(t^* _psschUid, cellId) is a third random function with an input variable t^* _psschUid and cellId, t^* _psschIs t_psschAnd the corresponding actual time slot number uid is the user identifier of the receiving user terminal for transmitting the HARQ information in the cell, and the cellId is the physical identifier of the cell where the receiving user terminal for transmitting the HARQ information is located. The output result of the third random function ranges from 0 to N_cs-1。

Under the condition of multicast service, a sequence offset value can be determined by a PSFCH index number and a sequence number of a receiving UE in a group, and can be specifically determined based on the maximum bearing capacity of a resource block to a PSFCH, the target PSFCH index number and a fourth random function; the input variables of the fourth random function are: the time slot number of PSSCH in each time slot in the sending window, the serial number of the receiving user terminal transmitting the HARQ information in the group and the physical identification of the cell where the receiving user terminal transmitting the HARQ information is located. As shown in equation (5).

a＝mod(mod(r,N_cs)+f₄(t^* _pssch,nID_{RX_Group},cellId),N_cs) (5)

Wherein a is the sequence offset value, f₄(t^* _pssch,nID_{RX_Group},cellId),N_cs) Is a fourth random function with an input variable of t^* _pssch、nID_{RX_Group}And cellId, t^* _psschIs t_psschCorresponding actual time slot number, nID_{RX_Group}Is the serial number of the receiving UE transmitting HARQ information in the group, and the cellId is the physical identifier of the cell where the receiving UE transmitting HARQ information is located. The output result of the fourth random function ranges from 0 to N_cs-1。

It should be noted that, in the embodiment of the present invention, the first random function, the second random function, the third random function, and the fourth random function are all used to randomize the inter-cell interference to which the receiving UE belongs as much as possible, and the randomization function defined in the NR protocol may be directly selected, or another random function may be selected.

The following provides a typical application scenario of NR with eV2X, where the frequency band is 6 GHz; the Sidelink BWP is 10MHz, the 30kHz subcarrier interval is adopted, and the total number of PRBs (physical resource blocks) is 27; each subband consists of continuous 4 PRBs, and the total number of effective subbands is 6; the transmission period of the PSFCH is 2 slots, i.e. 2 slots are included in the PSFCH feedback window. In a sending window corresponding to the current PSFCH feedback window, in the 1 st time slot, 2 PSSCH sub-band resources are transmitted, namely, (1) UE0 transmits a state indication message in the driving process of a team to UE4 (the sequence number in the group is 0) and UE5 (the sequence number in the group is 1) in the group by using a sub-band 5, and (2) UE1 transmits environment state information to UE6 by using a sub-band 4; in a sending window corresponding to the current PSFCH feedback window, in the 2 nd time slot, 2 PSSCH subband resources are also transmitted, namely, (1) UE2 transmits a status indication message to UE7 by using subband 3, and (2) UE3 transmits environmental status information to UE8 by using subband 5; the PB support cycle offset number is 12, and the number of supportable users is 3. The UE0, the UE1, the UE2, and the UE3 are all transmitting UEs, and the UE4, the UE5, the UE6, the UE7, and the UE8 are all receiving UEs. As shown in fig. 3, the abscissa in fig. 3 is a time slot including time slot n, time slot n +1, time slot n +2, and time slot n +3, and the ordinate is a sub-band including sub-band 0, sub-band 1, sub-band 2, sub-band 3, sub-band 4, and sub-band 5. The UE0 transmits a state indication message indicating the driving progress of the team to the UE4 and the UE5 in the group through the PSSCH corresponding to sub-band 5 on slot n, which is indicated by PSSCH _ UE0 pointing to UE4 and UE5 in fig. 3; the UE1 sends the context information to the UE6 via the PSSCH corresponding to subband 4 on slot n, which is indicated in fig. 3 by PSSCH _ UE1 pointing to UE 6; the UE2 transmits a status indication message to the UE7 via the PSSCH corresponding to sub-band 3 on slot n +1, represented in fig. 3 by PSSCH _ UE2 pointing to UE 7; the UE3 transmits the environmental status information to the UE8 via the PSSCH corresponding to subband 5 on slot n +1, represented in fig. 3 by PSSCH _ UE3 pointing to UE 8.

Based on the transmission method of the harq information provided in the embodiment of the present invention, the PSFCH index r used by the UE4 is 108, and the sequence offset a is 0; the PSFCH index r used by UE5 is 110, and the sequence offset value is 2; the PSFCH index r used by the UE6 is 12, and the sequence offset value a is 0; the PSFCH index r used by the UE7 is 25, and the sequence offset value a is 1; the UE8 uses the PSFCH index r-31 and the sequence offset a-7.

It should be noted that, in the embodiments of the present invention, it is assumed that output variables of the first random function, the second random function, the third random function, and the fourth random function take a value of 0.

As shown in fig. 4, an embodiment of the present invention provides a method for transmitting harq information, including:

s41, receiving hybrid automatic repeat request (HARQ) information;

s42, determining a receiving user terminal corresponding to the HARQ transmission based on a target PSFCH for transmitting the HARQ information and a pre-configured PSFCH resource pool of a physical direct connection feedback channel;

Specifically, in the method for transmitting harq information provided in the embodiment of the present invention, the execution subject is a sending user terminal. The sending user terminal receives the HARQ information, and then determines, according to a pre-configured PSFCH resource pool, a receiving UE corresponding to the PSFCH carrying the HARQ information, that is, which receiving UE feeds back the received HARQ information, so as to perform subsequent operations. The specific structure and internal information relationship of the pre-configured PSFCH resource pool refer to the above method class embodiment, which is not specifically limited in the embodiment of the present invention.

The transmission method of the hybrid automatic repeat request information provided by the embodiment of the invention utilizes the pre-configured PSFCH resource pool to establish the corresponding relation between the PSFCH and the time domain resource information and the frequency domain resource information of the PSSCH, so that the sending UE can more quickly determine which receiving UE the received HARQ information is fed back by, and the follow-up operation is convenient.

As shown in fig. 5, on the basis of the above embodiment, an embodiment of the present invention provides a hybrid automatic repeat request information transmission apparatus, including: a target PSFCH determination module 51 and a transmission module 52. Wherein the content of the first and second substances,

the target PSFCH determining module 51 is configured to determine, at a hybrid automatic repeat request HARQ information transmission time, a target PSFCH from a pre-configured PSFCH resource pool of a physical direct connection feedback channel based on a service type of data information to be fed back corresponding to the HARQ information and a PSSCH of the physical direct connection shared channel in each time slot within a transmission window of the data information to be fed back;

a transmission module 52 configured to transmit the HARQ information based on the target PSFCH;

Specifically, the harq information transmitting apparatus provided in the embodiment of the present invention may be specifically a receiving UE or may be integrated in the receiving UE, and the functions of the modules included in the harq information transmitting apparatus correspond to the operation flows of the steps in the method class embodiments implemented by the execution main body for the receiving UE one to one, so that the achieved effects are also consistent, and no further description is given in the embodiments of the present invention.

As shown in fig. 6, on the basis of the above embodiments, an embodiment of the present invention provides a hybrid automatic repeat request information transmission apparatus, including: a HARQ information receiving module 61 and a terminal determining module 62. Wherein the content of the first and second substances,

the HARQ information receiving module 61 is configured to receive hybrid automatic repeat request HARQ information;

the terminal determining module 62 is configured to determine, based on a target PSFCH for transmitting the HARQ information and a pre-configured PSFCH resource pool of a physical direct connection feedback channel, a receiving user terminal corresponding to the HARQ transmission;

Specifically, the harq information transmission apparatus provided in the embodiment of the present invention may be a sending UE or may be integrated in the sending UE, and the functions of the modules included in the harq information transmission apparatus correspond to the operation flows of the steps in the method class embodiments implemented by the execution main body for the sending UE one to one, so that the achieved effects are also consistent, and no further description is provided in the embodiments of the present invention.

As shown in fig. 7, on the basis of the above embodiment, an embodiment of the present invention provides an electronic device, including: a processor (processor)701, a memory (memory)702, a communication Interface (Communications Interface)703, and a bus 704; wherein the content of the first and second substances,

the processor 701, the memory 702, and the communication interface 703 are configured to communicate with each other via a bus 704. The memory 702 stores program instructions executable by the processor 701, and the processor 701 is configured to call the program instructions in the memory 702 to perform the harq information transmission method provided in the embodiments of the methods described above.

The logic instructions in memory 702 may be implemented in software functional units and stored in a computer readable storage medium when sold or used as a stand-alone article of manufacture. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

On the basis of the foregoing embodiments, embodiments of the present invention provide a non-transitory computer-readable storage medium storing computer instructions that cause the computer to execute the hybrid automatic repeat request information transmission method provided by the foregoing method embodiments.

The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.

Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A method for transmitting hybrid automatic repeat request information, comprising:

transmitting the HARQ information based on the target PSFCH;

2. The transmission method according to claim 1, wherein each timeslot in the transmission window corresponds to a timeslot number, and each PSFCH in the PSFCH resource pool corresponds to a PSFCH index number; accordingly, the number of the first and second electrodes,

3. The method according to claim 2, wherein the determining a target PSFCH from a pre-configured PSFCH resource pool based on the service type of the to-be-fed back data information corresponding to the HARQ information and the PSSCH of the to-be-fed back data information in each timeslot within a transmission window includes:

4. The method according to claim 3, wherein the ZC sequence used by the target PSFCH is an offset sequence of a base sequence.

5. The HARQ information transmission method of claim 4, wherein the sequence offset value of the offset sequence relative to the base sequence is determined by:

6. A method for transmitting hybrid automatic repeat request information, comprising:

receiving hybrid automatic repeat request (HARQ) information;

7. A hybrid automatic repeat request information transmission apparatus, comprising:

a target PSFCH determining module, configured to determine, at a hybrid automatic repeat request HARQ information sending time, a target PSFCH from a pre-configured PSFCH resource pool based on a service type of data information to be fed back corresponding to the HARQ information and a PSSCH of a physical direct connection shared channel in each time slot within a sending window of the data information to be fed back;

a transmission module configured to transmit the HARQ information based on the target PSFCH;

8. A hybrid automatic repeat request information transmission apparatus, comprising:

a HARQ information receiving module for receiving hybrid automatic repeat request HARQ information;

a terminal determining module, configured to determine, based on a target PSFCH for transmitting the HARQ information and a pre-configured PSFCH resource pool of a physical direct connection feedback channel, a receiving user terminal corresponding to the HARQ transmission;

9. An electronic device, comprising: memory, processor and computer program stored on the memory and executable on the processor, characterized in that the processor when executing the program performs the steps of the method for hybrid automatic repeat request information transmission according to any of claims 1-7.

10. A non-transitory computer readable storage medium having stored thereon a computer program, which when executed by a processor implements the steps of the method for hybrid automatic repeat request information transmission according to any of claims 1-7.