CN112584480A

CN112584480A - Processing method of bypass control information, bypass transmission method and user equipment

Info

Publication number: CN112584480A
Application number: CN201910927915.XA
Authority: CN
Inventors: 周淼; 吴敏; 孙霏菲
Original assignee: Beijing Samsung Telecommunications Technology Research Co Ltd; Samsung Electronics Co Ltd
Current assignee: Beijing Samsung Telecom R&D Center; Beijing Samsung Telecommunications Technology Research Co Ltd; Samsung Electronics Co Ltd
Priority date: 2019-09-27
Filing date: 2019-09-27
Publication date: 2021-03-30

Abstract

The embodiment of the application provides a processing method of bypass control information, a bypass transmission method and user equipment, and relates to the field of wireless communication. The method comprises the following steps: acquiring the configuration of the first bypass control information SCI and/or the configuration of the second SCI, and then sending the first SCI and/or the second SCI based on the configuration of the first SCI and/or the configuration of the second SCI; and/or measuring bypass resources corresponding to the first SCI and/or the second SCI based on the configuration of the first SCI and/or the configuration of the second SCI; and/or receiving the first SCI and/or the second SCI based on the configuration of the first SCI and/or the configuration of the second SCI, wherein the first SCI and the second SCI are associated. The embodiment of the application provides a specific mechanism for transmitting the second-stage SCI.

Description

Processing method of bypass control information, bypass transmission method and user equipment

Technical Field

The present application relates to the field of wireless communication technologies, and in particular, to a processing method of bypass control information, a bypass transmission method, and a user equipment.

Background

In Long Term Evolution (LTE) technology, bypass communication includes two main mechanisms, namely terminal-to-terminal (D2D) direct communication and Vehicle-to-outside communication (Vehicle-to-Vehicle/Infrastructure/peer/Network, which is collectively referred to as V2X), where V2X is designed on the basis of D2D technology, and is superior to D2D in terms of data rate, delay, reliability, link capacity, and the like, and is the most representative bypass communication technology in LTE technology.

In the LTE V2X system, different Physical channels are defined in bypass communication, including a Physical bypass Control Channel (PSCCH) and a Physical bypass Shared Channel (PSCCH). The PSCCH is used to carry data, and the PSCCH is used to carry Sidelink Control Information (SCI), where the SCI indicates information such as a time-frequency domain resource location, a modulation and coding scheme, and a reception target ID for the PSCCH, which are transmitted by the PSCCH. The sub-channel is also defined in the bypass communication as the minimum frequency domain unit of resource allocation, and the sub-channel is mainly divided for the data channel, but the concept can also be similarly applied to the control channel.

From the resource allocation perspective, the LTE V2X system includes two modes: a resource allocation Mode (Mode 3) based on base station scheduling and a resource allocation Mode (Mode 4) autonomously selected by a User Equipment (UE). Both modes are based on bypassing subchannels defined in the system, several control and/or data subchannels are selected by the base station scheduling or the UE autonomously for bypassing the transmission.

A 5G New air interface (5G New RAdio, 5G NR) system, as an evolution technology of LTE, correspondingly includes further evolution of bypass communication, and similarly, concepts of PSCCH and PSCCH are also introduced in NR V2X, and also a resource allocation Mode (Mode 1) based on base station scheduling and a resource allocation Mode (Mode 2) autonomously selected by the UE are supported.

Different from the bypass communication system of the LTE, which only supports blind retransmission and does not support Hybrid Automatic Repeat request Acknowledgement (HARQ-ACK) feedback, the NR V2X also introduces a HARQ-ACK feedback mechanism, which is applicable to unicast and multicast services. Therefore, the bypass communication in NR V2X includes two types of the blind retransmission-based bypass communication and the HARQ-based bypass communication. In the blind retransmission based bypass communication, the receiving end UE does not provide HARQ-ACK feedback information, and the sending end UE repeatedly transmits the bypass transport block N times, where N is a predefined or configured value, so that the transmission number of each transport block is fixed and does not change according to the feedback information provided by the receiving end. In the HARQ-based bypass communication, the receiving end UE needs to send HARQ-ACK feedback information, and after sending the bypass transport block, the sending end UE determines whether the bypass transport block needs to be retransmitted according to whether ACK feedback is received or whether NACK feedback is received. The HARQ-ACK Feedback information is transmitted on a bypass Channel, and in NR V2X, a Channel for carrying the HARQ-ACK Feedback information on the bypass Channel is defined as a Physical downlink Feedback Channel (PSFCH).

The current multiplexing method of PSSCH and PSCCH mainly comprises the following steps: PSCCH and PSSCH use non-overlapping time domain resources, and the frequency domain resources of the PSCCH and the PSSCH are the same or different; PSCCH and PSSCH use non-overlapping frequency domain resources, and the time domain resources of the PSCCH and the PSSCH are the same; or, one part of PSCCH and PSSCH uses the resources with time domain coincidence and frequency domain non-coincidence, and the other part of PSSCH and/or PSCCH uses the resources with non-coincidence time domain. The design of the sub-channel of NR V2X will be based on the multiplexing method of psch and PSCCH. The multiplexing method of the PSFCH, the PSSCH and/or the PSCCH mainly comprises the following steps: the PSFCH and the psch and/or PSCCH may be at least time division multiplexed, using non-overlapping time domain resources, the frequency domain resources of which are the same or not identical; it is also possible to time-and frequency-division multiplex, using the same part of the time domain resources and using different frequency domain resources on the overlapping part of the time domain resources.

Currently, the association relationship between SCI and psch carrying bypass data mainly includes: bypass data is transmitted on the psch, which is associated with N SCIs, supporting at least N-1 and N-2. For the case where N is 1, the SCI is transmitted on the PSCCH; for the case of N ═ 2, the 2 SCIs associated with the psch are also referred to as 2-stage SCIs (2-stage SCIs), and the 2 SCIs are first-stage SCIs (first-stage SCIs) and second-stage SCIs (second-stage SCIs), respectively, where the first-stage SCIs are transmitted on the PSCCH and the specific details regarding the transmission of the second-stage SCIs are not determined.

The potential advantage of the 2-order SCI is that less information can be placed in the first-order SCI for the potential receiving-end UEs to perform blind detection, and which receiving-end UEs need to decode the second-order SCI and the PSSCH and other information for decoding the second-order SCI and/or the PSSCH are indicated in the first-order SCI, so that the overhead of the receiving-end UEs during blind detection of the SCIs is reduced; in addition, the method and the device also help to support bypass transmission under different service types and different service scenes to use a uniform first-order SCI format, and other control information which can be changed is transmitted in a second-order SCI. Thus, it was preliminarily determined in the prior art that if two-stage SCI is enabled, at least information for channel sensing (sensing) and information for decoding the second-stage SCI is carried in the first-stage SCI.

In addition, in Mode 1, UE transmissions on the bypass are scheduled by the base station, and signaling used by the base station to schedule the bypass resource for the sending UE is called a bypass grant (sidelink grant) and includes a dynamic grant (dynamic grant) and a configured grant (configured grant), and the configured grant further includes grants of type 1 and type 2 (type-1, type-2) configurations. The dynamic grant is transmitted as DCI in the PDCCH; the configured grant is transmitted as higher layer signaling in the PDSCH and may be activated/released through DCI.

In the NR V2X system, since the second-order SCI is a newly introduced feature compared to LTE, the specific mechanism for transmitting the second-order SCI is lacking in the prior art.

Further, in the NR V2X system, it is necessary to determine how the UE performs bypass transmission according to the base station scheduling.

Disclosure of Invention

The application provides a processing method of bypass control information, a bypass transmission method and user equipment, which can solve at least one technical problem. The technical scheme is as follows:

in a first aspect, a bypass control information transmission method is provided, which is performed by a UE, and includes:

acquiring the configuration of a first piece of bypass control information SCI and/or the configuration of a second SCI;

based on the configuration of the first SCI and/or the configuration of the second SCI, at least one of the following operations is performed:

transmitting the first SCI and/or the second SCI;

measuring bypass resources corresponding to the first SCI and/or the second SCI;

receiving the first SCI and/or the second SCI;

wherein the first SCI and the second SCI are associated.

In a second aspect, a user equipment is provided, which includes:

the configuration acquisition module is used for acquiring the configuration of the first piece of bypass control information SCI and/or the configuration of the second SCI;

the execution operation module is used for executing at least one of the following operations based on the configuration of the first SCI and/or the configuration of the second SCI:

transmitting the first SCI and/or the second SCI;

receiving the first SCI and/or the second SCI;

wherein the first SCI and the second SCI are associated.

In a third aspect, a user equipment is provided, including:

one or more processors;

a memory;

one or more application programs, wherein the one or more application programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs configured to: and executing the operation corresponding to the processing method of the bypass control information shown in the first aspect.

In a fourth aspect, there is provided a computer readable storage medium storing at least one instruction, at least one program, a set of codes, or a set of instructions, which is loaded and executed by a processor to implement the method of processing bypass control information as set forth in the first aspect.

In a fifth aspect, a bypass transmission method is provided, which is performed by a UE, and includes:

receiving a bypass authorization signaling sent by a base station;

the bypass transmission is performed based on a bypass grant.

In a sixth aspect, a user equipment is provided, including:

a receiving module, configured to receive a bypass authorization signaling sent by a base station;

and the bypass transmission module is used for performing bypass transmission based on the bypass authorization.

In a seventh aspect, a user equipment is provided, including:

one or more processors;

a memory;

one or more application programs, wherein the one or more application programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs configured to: the method of bypassing transmission according to the fifth aspect is performed.

In an eighth aspect, there is provided a computer readable storage medium storing at least one instruction, at least one program, set of codes, or set of instructions, which is loaded and executed by a processor to implement the method of bypassing transmissions as set forth in the fifth aspect.

The beneficial effect that technical scheme that this application provided brought is:

compared with the prior art, the method for processing the bypass control information, the user equipment and the computer-readable storage medium have the advantages that the configuration of the first bypass control information SCI and/or the configuration of the second SCI are/is acquired, and then the first SCI and/or the second SCI are/is sent based on the configuration of the first SCI and/or the second SCI; and/or measuring bypass resources corresponding to the first SCI and/or the second SCI based on the configuration of the first SCI and/or the configuration of the second SCI; and/or receiving the first SCI and/or the second SCI based on the configuration of the first SCI and/or the configuration of the second SCI; wherein the first SCI and the second SCI are associated such that transmission of the second SCI is enabled.

Compared with the prior art, the bypass transmission method, the user equipment and the computer readable storage medium have the advantages that the bypass transmission based on the base station scheduling can be realized by receiving the bypass authorization signaling sent by the base station and then performing the bypass transmission based on the received bypass authorization.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings used in the description of the embodiments of the present application will be briefly described below.

Fig. 1a is a schematic flowchart of a method for processing bypass control information according to an embodiment of the present disclosure;

fig. 1b is a schematic flow chart of a bypass transmission method according to an embodiment of the present application;

fig. 2 is a schematic device structure diagram of a user equipment according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of another apparatus of a user equipment according to an embodiment of the present application;

fig. 4 is a schematic structural diagram of a user equipment according to an embodiment of the present application.

Detailed Description

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present invention.

As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. As used herein, the term "and/or" includes all or any element and all combinations of one or more of the associated listed items.

To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

The following describes the technical solutions of the present application and how to solve the above technical problems with specific embodiments. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments. Embodiments of the present application will be described below with reference to the accompanying drawings.

The Physical bypass Control Channel PSCCH in the following embodiments may also be a Physical Downlink Control Channel (PDCCH), an Enhanced Physical Downlink Control Channel (EPDCCH), a Machine Type Communication Physical Downlink Control Channel (MPDCCH), a Narrowband Physical Downlink Control Channel (NPDCCH), or a New Radio-Physical Downlink Control Channel (NR-PDCCH); the psch may also be a Physical Downlink Shared Channel (PDSCH), an Enhanced Physical Downlink Shared Channel (EPDSCH), a Machine Communication Physical Downlink Shared Channel (MPDSCH), a Narrowband Physical Downlink control Channel (NPDSCH), a New air interface Physical Downlink Shared Channel (NR-PDSCH); the Physical Uplink Control Channel (PUCCH) may also be another Channel dedicated to carrying specific Uplink Control messages or specific bypass Control information.

Alternatively, the time slot in the following embodiments may be a physical subframe or time slot, or a logical subframe or time slot. Specifically, a subframe or slot in a logical sense is a subframe or slot corresponding to a resource pool for bypassing communication. For example, in the V2X system, a resource pool is defined by a repetitive bitmap that maps to a specific set of slots, which may be all slots or all slots except some specific slots (e.g., slots that transmit Master Information Blocks (MIB)/System Information Blocks (SIBs)). The slot indicated as "1" in the bitmap may be used for V2X transmission, belonging to the slot corresponding to the V2X resource pool; the time slot indicated as "0" is not available for V2X transmission and does not belong to the time slot corresponding to the V2X resource pool.

The distinction of subframes or time slots in this physical or logical sense is explained below by a typical application scenario: when calculating the time domain interval (gap) between two specific channels/messages (e.g. PSSCH carrying bypass data and PSFCH carrying corresponding feedback information), it is assumed that the interval is N slots, if a physical subframe or slot is calculated, the N slots correspond to an absolute time length of N x milliseconds in the time domain, and x is the time length of a physical slot (subframe) under numerology of the scenario; otherwise, if a logically meaningful subframe or slot is calculated, taking the bypass resource pool defined by the bitmap as an example, the interval of the N slots corresponds to N slots indicated as "1" in the bitmap, and the absolute time length of the interval varies according to the specific configuration condition of the bypass communication resource pool, and does not have a fixed value. The advantage of using physical slots is lower complexity. The advantage of using logical timeslots is that when resource mapping (e.g. resource mapping between psch and PSFCH) is performed based on logical timeslots in the resource pool, there is no mapping result that is different due to different physical distributions of logical timeslots, and there is higher consistency from the perspective of system design.

Alternatively, the time slot in the following embodiments may be a complete time slot, or may be several symbols corresponding to bypass communication in one time slot. For example, when the bypass communication is configured to be performed on the X1 th to X2 th symbols of each slot, the slots in the following embodiments are the X1 th to X2 th symbols in the slot in this scenario; alternatively, when the bypass communication is configured as mini-slot (mini-slot) transmission, the slots in the following embodiments are mini-slots defined or configured in the bypass system, not slots in the NR system.

Optionally, in the following embodiments, the information configured by the base station, indicated by signaling, configured by a higher layer, and preconfigured may include one set of configuration information, and may further include multiple sets of configuration information, from which the UE selects one set of configuration information to use according to a predefined condition; the UE also comprises a group of configuration information containing a plurality of subsets, and the UE selects one subset to use according to a predefined condition.

Some technical solutions provided in the following embodiments are specifically described based on the V2X system, but the application scenarios thereof should not be limited to the V2X system in bypass communication, but may also be applied to other bypass transmission systems. For example, the V2X subchannel-based design in the following embodiments may also be used for the D2D subchannel or other bypass transmitted subchannels. The V2X resource pool in the following embodiments may also be used in other bypass transmission systems, such as D2D replaced with a D2D resource pool. The data channel PSSCH in the V2X system in the following embodiments may also be replaced with a D2D data channel in other bypass transmission systems, such as D2D.

In the following embodiments, when the bypass communication system is a V2X system, the terminals or UEs may be multiple types of terminals or UEs such as vehicles (vehicles), Infrastructure (Infrastructure), pedestrians (peers), and the like.

The bypass transmission in the following embodiments comprises at least one of: the transmission of the bypass data channel carrying the bypass data, the transmission of the bypass control channel carrying the bypass control information SCI associated with the bypass data, and the transmission of the bypass feedback channel carrying the feedback information corresponding to the bypass data.

An embodiment of the present application provides a method for processing bypass control information, which is executed by a user equipment UE, and as shown in fig. 1a, the method includes:

step S101, the configuration of the first bypass control information SCI and/or the configuration of the second SCI are obtained.

Step S102, based on the configuration of the first SCI and/or the configuration of the second SCI, at least one of the following operations is executed:

transmitting the first SCI and/or the second SCI;

receiving the first SCI and/or the second SCI;

wherein the first SCI and the second SCI are associated.

Specifically, the second SCI associated with the first SCI includes: and the second SCI is associated with the same PSSCH as the first SCI, and/or the carried bypass control information corresponds to the second SCI of the same PSSCH as the bypass control information carried by the first SCI.

Another possible implementation manner of the embodiment of the present application, sending the first SCI and/or the second SCI includes: transmitting the first SCI and/or the second SCI associated with the bypass data when the bypass data is transmitted;

the measuring of the bypass resource corresponding to the first SCI and/or the second SCI includes: measuring a bypass channel and/or bypass resources corresponding to the first SCI and/or the second SCI when measuring the bypass channel;

wherein, receiving the first SCI and/or the second SCI comprises: the first SCI and/or the second SCI carrying the bypass control information are received when the bypass control information and/or the bypass data are received.

Another possible implementation manner of the embodiment of the present application, based on the configuration of the first SCI and/or the configuration of the second SCI, when transmitting the bypass data, sending the first SCI and/or the second SCI associated with the bypass data, includes:

transmitting the first SCI and/or the second SCI based on the configuration of the first SCI and/or the configuration of the second SCI if the configurations of the first SCI and the second SCI are indicated and/or preconfigured and/or predefined by the base station in at least one of higher layer signaling and physical layer signaling;

wherein, based on the configuration of the first SCI and/or the configuration of the second SCI, the bypass channel and/or the bypass resource corresponding to the first SCI and/or the second SCI is measured or processed when the bypass channel is measured, and/or the first SCI and/or the second SCI carrying the bypass control information is received when the bypass control information and/or the bypass data is received based on the configuration of the first SCI and/or the configuration of the second SCI, the method comprises the following steps:

if the configuration of the first SCI and/or the configuration of the second SCI are indicated by other UEs in higher layer signaling or in physical signaling, performing at least one of the following operations based on the configuration of the first SCI and/or the configuration of the second SCI:

measuring or processing a bypass channel and/or bypass resource corresponding to the first SCI and/or the second SCI when measuring the bypass channel;

the corresponding reception carries the first SCI and/or the second SCI of the bypass control information when the bypass control information and/or the bypass data is received.

In another possible implementation manner of the embodiment of the present application, if the configuration of the first SCI and the second SCI is indicated and/or preconfigured and/or predefined in at least one of higher layer signaling and physical layer signaling by the base station, at least one of the following steps is performed:

transmitting the first SCI and/or the second SCI;

the first SCI and/or the second SCI carrying the bypass control information are received when the bypass control information and/or the bypass data are received.

If the configuration of the first SCI and the second SCI is indicated by other UEs in higher layer signaling or in physical signaling, performing at least one of the following:

In another possible implementation manner of the embodiment of the present application, the configuration of the second SCI includes at least one of:

information indicating whether the second SCI is enabled; conditions for determining whether the second SCI is enabled; resource-related configuration of the second SCI; reference signal configuration for the second SCI; and configuring power control parameters of the second SCI.

Another possible implementation manner of the embodiment of the present application, sending the second SCI based on the resource related configuration of the second SCI, includes:

determining a bypass channel and/or bypass resources for transmitting the second SCI based on the resource-related configuration of the second SCI;

transmitting the second SCI according to the determined bypass channel and/or bypass resource for transmitting the second SCI;

the measuring the bypass channel and/or the bypass resource corresponding to the second SCI when measuring the bypass channel based on the resource related configuration of the second SCI includes:

determining a bypass channel and/or bypass resources for measuring the second SCI based on the resource-related configuration of the second SCI;

according to the determination result, measuring a bypass channel and/or bypass resources corresponding to the second SCI when measuring the bypass channel;

wherein, based on the resource-related configuration of the second SCI, receiving the second SCI carrying the bypass control information when receiving the bypass control information and/or the bypass data comprises:

determining a bypass channel and/or bypass resource for receiving the second SCI carrying the bypass control information when receiving the bypass control information and/or the bypass data based on the resource related configuration of the second SCI;

a second SCI carrying bypass control information is received upon receiving bypass control information and/or bypass data based on the determination.

Specifically, when measuring the bypass channel, measuring the bypass channel and/or bypass resource corresponding to the second SCI, specifically further comprising,

determining whether to measure the second SCI when measuring the bypass channel;

if the second SCI is determined to be measured, determining information of a reference signal for measuring the second SCI based on the resource-related configuration of the second SCI;

and according to the determination result, measuring the bypass channel and/or bypass resource corresponding to the second SCI when measuring the bypass channel.

Another possible implementation manner of the embodiment of the present application, sending the second SCI based on the reference signal configuration of the second SCI, includes: generating a reference signal corresponding to the second SCI based on the reference signal configuration of the second SCI; the second SCI is sent along with the generated reference signal.

The reference signal corresponding to the second SCI may include, for example: reference signals in the channel and/or resources occupied by the second SCI.

The measuring of the bypass channel and/or the bypass resource corresponding to the second SCI when measuring the bypass channel based on the reference signal configuration of the second SCI includes: determining information for measuring a reference signal of the second SCI based on the reference signal configuration of the second SCI; according to the determination result, measuring a bypass channel and/or bypass resources corresponding to the second SCI when measuring the bypass channel;

wherein, the receiving of the second SCI carrying the bypass control information when receiving the bypass control information and/or the bypass data based on the reference signal configuration of the second SCI comprises: determining a reference signal of the second SCI carrying the bypass control information received when the bypass control information and/or the bypass data are received based on the reference signal configuration of the second SCI; a second SCI carrying bypass control information is received upon receiving bypass control information and/or bypass data based on the determination.

Specifically, the measuring the bypass channel and/or the bypass resource corresponding to the second SCI when measuring the bypass channel based on the reference signal configuration of the second SCI includes: determining whether to measure the second SCI when measuring the bypass channel, and if determining to measure the second SCI, configuring information of a reference signal for measuring the second SCI based on the reference signal of the second SCI; and according to the determination result, measuring the bypass channel and/or bypass resource corresponding to the second SCI when measuring the bypass channel.

Another possible implementation manner of the embodiment of the present application, sending the second SCI based on the power control parameter configuration of the second SCI, includes: determining the transmission power of the second SCI based on the power control parameter configuration of the second SCI; transmitting the second SCI according to the determined transmission power of the second SCI;

the measuring the bypass channel and/or the bypass resource corresponding to the second SCI when measuring the bypass channel based on the power control parameter configuration of the second SCI includes: determining the measured transmission power of the second SCI based on the power control parameter configuration of the second SCI; according to the determination result, measuring a bypass channel and/or bypass resources corresponding to the second SCI when measuring the bypass channel;

wherein, based on the power control parameter configuration of the second SCI, receiving the second SCI carrying the bypass control information when receiving the bypass control information and/or the bypass data, includes: determining the transmission power of the received second SCI carrying the bypass control information based on the power control parameter configuration of the second SCI; upon receiving the bypass control information and/or the bypass data, receiving the second SCI carrying the bypass control information based on the determined transmission power of the received second SCI carrying the bypass control information.

In another possible implementation manner of the embodiment of the present application, after measuring the bypass channel, the method further includes: in the sensing process of the bypass channel, determining that the bypass resource meeting a first preset condition cannot be used for transmitting a physical bypass shared channel PSSCH according to the measurement result of the bypass channel; and determining a bypass resource for transmitting the PSSCH according to the sensing result.

Another possible implementation manner of the embodiment of the present application, determining, according to a measurement result of a bypass channel, that a bypass resource meeting a first preset condition cannot be used for transmitting a physical bypass shared channel PSSCH, includes: determining a first candidate resource set in a preset time interval according to the time domain size and/or the frequency domain size of a physical bypass shared channel PSSCH and a sensed time domain reference point; according to the measurement result, eliminating the candidate resources meeting the first preset condition from the first candidate resource set to obtain a second candidate resource set; sequencing all candidate resources in the second candidate resource set according to a preset rule and a measurement result; and selecting a preset number of candidate resources from the second candidate resource set according to the sorting result.

Determining a bypass resource for transmitting PSSCH according to the sensing result, wherein the determining comprises the following steps: and determining the bypass resource for transmitting the PSSCH based on the selected preset number of candidate resources.

In another possible implementation manner of the embodiment of the application, the first preset condition includes at least one of the following:

the UE receives a first SCI in a first preset time slot;

the UE receives a second SCI in a second preset time slot;

the Reference Signal Received Power (RSRP) of the PSSCH of the candidate resource and/or the RSRP of the second SCI meet a second preset condition; the PSSCH on the candidate resource is a PSSCH associated with the first SCI and/or the second SCI;

the candidate resource overlaps with the PSSCH resource indicated in the first SCI and/or the second SCI;

the candidate resource overlaps with a resource of a second SCI indicated in the first SCI;

the candidate resource overlaps with a resource used by a second SCI associated with the first SCI.

Wherein, in the above embodiment: the relationship between the first time slot and/or the second time slot and the perceived time domain reference point meets a preset condition, for example, the first time slot and/or the second time slot is located in a time window derived from the perceived time domain reference point and used for determining the first candidate resource set.

In another possible implementation manner of the embodiment of the present application, the second preset condition includes at least one of:

the RSRP of the PSSCH on the candidate resource exceeds a preset PSSCH-RSRP threshold;

the RSRP of the second SCI on the candidate resource is larger than a preset second SCI-RSRP threshold value;

the RSRP of the PSSCH on the candidate resource and the RSRP of the second SCI on the candidate resource correspond to a weighting result greater than a second predetermined RSRP threshold.

Another possible implementation manner of the embodiment of the present application, receiving the first SCI and/or the second SCI, and then further includes: after receiving the plurality of second SCIs, determining the second SCI which can be combined in the plurality of second SCIs; merging the determined second SCIs which can be merged to obtain a merged second SCI; the combined second SCI is decoded.

Of course, when the second SCI is merged, only the second SCI may be merged, but not the first SCI, and of course, the first SCI may also be merged when the second SCI is merged. The embodiments of the present application are not limited.

In another possible implementation manner of the embodiment of the present application, determining a second SCI that can be merged in the plurality of second SCIs includes at least one of:

if the received multiple second SCIs are associated with multiple transmission and/or retransmission bypass control information and/or bypass data channels corresponding to the same bypass transport block, determining that the received multiple second SCIs are combinable second SCIs;

and if the received multiple second SCIs are associated with multiple transmission and/or retransmission bypass control information and/or bypass data channels corresponding to the same bypass transport block, and the content of the received multiple second SCIs meets a third preset condition, determining the received multiple second SCIs as combinable second SCIs.

For the embodiment of the present application, the content of the SCI satisfying the third preset condition includes at least one of: the SCI content is the same, the SCI content is different, and the change situation of the SCI content can be estimated.

Another possible implementation manner of the embodiment of the present application, sending the first SCI and/or the second SCI includes at least one of the following:

sending a first SCI indicating that there is no associated second SCI;

transmitting a first SCI and a second SCI, wherein the first SCI indicates the existence of the associated second SCI and/or indicates scheduling information of the associated second SCI;

wherein, receiving the first SCI and/or the second SCI comprises:

receiving a first SCI;

if the first SCI indicates the presence of an associated second SCI and/or scheduling information indicating the associated second SCI, the associated second SCI is received based on the indication.

In another possible implementation manner of the embodiment of the present application, the scheduling information of the second SCI includes at least one of the following items:

all or a specific part of the information in the configuration of the second SCI;

the resource location actually used by the second SCI;

the reference signal configuration actually used by the second SCI;

configuring power control parameters actually used by the second SCI;

and (c) an indication of the presence or absence of a particular one or more fields in the second SCI.

Wherein, the resource location actually used by the 2 nd order SCI includes at least one of the following:

a corresponding resource mapping pattern of the 2 nd order SCI in each sub-channel; a corresponding resource mapping pattern of the 2 nd order SCI in a plurality of sub-channels;

the configuration of the reference signal actually used by the 2 nd-order SCI includes at least one of the following:

indication information of whether a specific reference signal is included in the 2 nd-order SCI; a time domain pattern of a DMRS of order 2 SCI; a frequency domain pattern of a DMRS of the order 2 SCI; a time domain pattern of CSI-RS of a 2 nd order SCI; a frequency domain pattern of CSI-RSI for the 2 nd order SCI;

in another possible implementation manner of the embodiment of the present application, the resource-related configuration of the second SCI includes at least one of:

a resource mapping pattern corresponding to the first SCI in each sub-channel; a resource mapping pattern corresponding to the first SCI in a plurality of sub-channels; a resource mapping pattern corresponding to the second SCI in each sub-channel; a resource mapping pattern corresponding to the second SCI in a plurality of sub-channels;

wherein the reference signal configuration of the second SCI comprises at least one of:

information indicating whether a specific reference signal is included in the second SCI; resource location of a specific reference signal contained in the second SCI; a time domain pattern of a demodulation reference signal (DMRS) of the second SCI; frequency domain pattern of DMRS for the second SCI; a time domain pattern of a channel state information reference signal (CSI-RS) of the second SCI; a frequency domain pattern of CSI-RS of the second SCI;

wherein, the power control parameter configuration of the second SCI includes at least one of the following items:

configuring power control parameters of the first SCI; configuring power control parameters of a second SCI; a power offset between the first SCI and the second SCI; the power offset between the first SCI and the PSSCH; the power offset between the second SCI and the psch.

Compared with the prior art, the embodiment of the application acquires the configuration of a first piece of bypass control information SCI and/or the configuration of a second SCI, and then sends the first SCI and/or the second SCI based on the configuration of the first SCI and/or the second SCI; and/or measuring bypass resources corresponding to the first SCI and/or the second SCI based on the configuration of the first SCI and/or the configuration of the second SCI; and/or receiving the first SCI and/or the second SCI based on the configuration of the first SCI and/or the configuration of the second SCI; wherein the first SCI and the second SCI are associated such that transmission of the second SCI is enabled.

An embodiment of the present application provides a bypass transmission method, which is executed by a user equipment UE, as shown in fig. 1b, and includes:

step S201, receiving a bypass authorization signaling sent by a base station.

And step S202, performing bypass transmission based on the bypass authorization.

In another possible implementation manner of the embodiment of the present application, after step S201, the method may further include: and sending confirmation information used for indicating whether the bypass authorization is successfully received to the base station.

In another possible implementation manner of the embodiment of the present application, after step S201, the method may further include: acquiring scheduling information from a bypass authorization signaling;

performing bypass transmission based on the scheduling information;

wherein the scheduling information comprises at least one of:

information relating to the 2 nd SCI;

the data carried by the PSSCH is indication information of first transmission or retransmission;

identity identification information of the target UE which is transmitted by-pass;

the indication information corresponding to the HARQ process of the hybrid automatic repeat request used by the bypass transmission;

step S202 may specifically include: bypass transmission is performed based on the scheduling information.

For the embodiment of the present application, the scheduling information obtained from the bypass signaling may be the same as the scheduling information of the 2 nd SCI, or the scheduling information obtained from the bypass signaling may be a subset of the scheduling information of the 2 nd SCI, or the 2 nd SCI is a subset of the scheduling information obtained from the bypass signaling. The embodiments of the present application are not limited.

Compared with the prior art, the embodiment of the application provides a bypass transmission method, and the bypass transmission method can realize the bypass transmission based on the scheduling of the base station by receiving the bypass authorization signaling sent by the base station and then performing the bypass transmission based on the received bypass authorization.

In the above embodiments, a method for processing bypass control information and a method for bypass transmission are described, and the following two methods are described in conjunction with more specific embodiments, specifically as follows:

first, a transmission method of a 2-stage SCI of bypass communication is introduced, which is specifically as follows:

the UE acquires the configuration of the 2-order SCI, and executes at least one of the following a, b and c according to the acquired configuration of the 2-order SCI:

a. transmitting the SCI or the 2-stage SCI;

specifically, the SCI associated with the bypass data or the SCI of order 2 is transmitted accordingly when the bypass data is transmitted; it is also possible to send an SCI or an SCI of order 2 and not to send bypass data, which is optionally bypass data associated with the SCI or SCI of order 2.

b. When measuring the bypass channel, correspondingly measuring or processing the bypass channel or bypass resource corresponding to the SCI of 2 order;

c. the SCI or the SCI of order 2 carrying the bypass control information is received accordingly when the bypass control information and/or the bypass data is received.

For the embodiment of the present application, since the 2-stage SCI may include: the 1 st-order SCI and the 2 nd-order SCI, and thus the receiving of the SCI carrying the bypass control information or the 2 nd-order SCI in c, may include: receive the 1 st and 2 nd order SCIs of the bypass control information, or receive only the 1 st order SCI carrying the bypass control information and not receive the 2 nd order SCI. For example, in order to determine whether the detected bypass transmission needs to be decoded, the receiving-side UE needs to decode the first-order SCI and determine whether itself is the target UE indicated in the first-order SCI, decode the 2 nd-order SCI if itself is the target UE, and otherwise not decode the 2 nd-order SCI. For example, in order to determine the interference caused by the received signal to the bypass channel, the UE needs to decode the 1 st order SCI, and measure the interference of the 2 nd order SCI (e.g. determine the severity of the interference by measuring RSRP or RSSI) according to the information indicated in the 1 st order SCI (e.g. resource location or reference signal configuration of the 2 nd order SCI, etc.) on the premise that the decoding of the 1 st order SCI is successful, but the measurement step does not need to decode the 2 nd order SCI.

For example, if the UE is referred to as a first UE, the first UE acquires the configuration of the SCI of 2 level, and performs at least one of a, b, and c according to the acquired configuration of the SCI of 2 level. Further, the indication method of the configuration of the 2-order SCI includes at least one of the following: the base station indicates in the higher layer signaling, the base station indicates in the physical layer signaling, the second UE indicates in the higher layer signaling, and the second UE indicates in the physical layer signaling. And the second UE is any UE except the first UE.

Wherein the physical layer signaling comprises at least one of: downlink Control Information (DCI), bypass dynamic grant, grant of bypass configuration (including Type-1 and/or Type-2), and SCI (including 1 st order SCI and 2 nd order SCI).

Further, for example, the first UE obtains the configuration of the SCI of order 2 indicated by the base station in the higher layer signaling and/or the physical layer signaling, which is the configuration of the first UE; and/or the first UE acquires the configuration of the 2-order SCI indicated by the second UE in the higher layer signaling and/or the physical layer signaling, and the configuration is the configuration of the second UE.

Optionally, the first UE transmits the SCI associated with the bypass data or the SCI of order 2 accordingly when transmitting the bypass data according to the configuration of the SCI of order 2 indicated by the base station or preconfigured or predefined; optionally, the first UE measures or processes a bypass channel or bypass resource corresponding to the SCI of order 2 sent by the second UE when measuring the bypass channel according to the configuration of the SCI of order 2 indicated by the second UE, and/or receives the SCI carrying the bypass control information or the SCI of order 2 when receiving the bypass control information and/or the bypass data sent by the second UE.

Optionally, the first UE performs at least one of a, b, c according to the configuration of the SCI of order 2 indicated and/or preconfigured and/or predefined by the base station through higher layer signaling and/or physical layer signaling; and the first UE executes at least one of b and c according to the configuration of the 2-order SCI indicated by the second UE.

Wherein, the configuration of the 2-level SCI may be at least one of: cell-specific, resource pool-specific, UE-specific, service priority-specific, service type (unicast/broadcast/multicast) specific, service-specific, determined based on a specific bypass configuration.

Optionally, if the configuration of the SCI of 2-stage includes the above at least two items, the UE determines the specifically used configuration according to the priority between the at least two items, which may be one or more configurations; for example, the UE assumes the UE-specific 2-order SCI configuration is prioritized over the cell-specific 2-order SCI configuration and determines to use the UE-specific 2-order SCI configuration, which further includes one or more 2-order SCI configurations specific to traffic priority.

Optionally, the priority may be determined based on an indication manner of the 2-level SCI configuration, that is, the indication manner of the 2-level SCI configuration is different, and the corresponding priorities may also be different; for example, the UE assumes that the priority of the SCI-2 configuration indicated by the UE-specific signaling is higher than the SCI-2 configuration indicated by the broadcast signaling, or the UE assumes that the priority of the SCI-2 configuration indicated by the dynamic signaling is higher than the SCI-2 configuration indicated by the semi-static signaling. However, the determination of the priority is not limited to the above case, and any manner that can determine the priority of the 2-step SCI configuration is within the scope of the embodiments of the present application.

Further, the particular bypass configuration includes at least one of: whether HARQ is enabled for bypass transmission; the multicast feedback is to feed back NACK only, or to feed back ACK and NACK.

Further, the content of the configuration of the 2-level SCI includes at least one of: whether a level 2 SCI is enabled; under what conditions SCI stage 2 is enabled; resource-related configuration of the 2-level SCI; reference signal configuration for SCI of order 2; and (3) configuring power control parameters of the SCI of 2 orders.

Further, the resource-related configuration of the level 2 SCI includes at least one of: channel type of order 2 SCI; time and/or frequency domain resources of order 1 SCI; time and/or frequency domain resources of the order 2 SCI; resource mapping configuration of SCI of level 2.

Further, the resource mapping configuration of the SCI of order 2 includes at least one of: a resource mapping pattern (pattern) of the 1 st order SCI in each or a specific one of the sub-channels; the corresponding resource mapping patterns of the 1 st-order SCI in a plurality of sub-channels (i.e. one resource mapping pattern can represent the resource mapping relationship of a plurality of sub-channels); a resource mapping pattern of the order 2 SCI in each or a specific one of the subchannels; the SCI of level 2 maps the corresponding resource mapping pattern in a plurality of sub-channels.

Optionally, the UE determines whether to measure the order 2 SCI according to a predetermined criterion, e.g., the UE determines that the order 2 SCI will always be measured when measuring the bypass channel, or determines that the order 2 SCI will always be measured during the bypass channel sensing procedure; or the UE determines whether to measure the SCI of order 2 according to the configuration of the SCI of order 2, e.g., whether the UE needs to measure the SCI of order 2 is explicitly or implicitly indicated in the configuration of the SCI of order 2, the explicit indication includes a 1-bit indication in the configuration using the SCI of order 2, and the implicit indication includes a reference signal configuration indication in the configuration using the SCI of order 2 (e.g., the UE determines to measure the SCI of order 2 when the reference signal configuration in the configuration of the SCI of order 2 indicates that a specific reference signal is present in the SCI of order 2 and/or a time and/or frequency resource location of the specific reference signal is present in the SCI of order 2, and otherwise determines not to measure the SCI of order 2).

Specifically, the UE determines, according to the resource-related configuration of the SCI of order 2, a bypass channel and/or resource for sending the SCI of order 2 when sending the bypass transmission; and/or the UE determines whether to measure the SCI of the 2 nd order or not when measuring the bypass channel according to the resource related configuration of the SCI of the 2 nd order, if the SCI of the 2 nd order is determined to be measured, the bypass channel and/or the bypass resource used for measuring the SCI of the 2 nd order are determined; and/or the UE determines a bypass channel and/or bypass resources for receiving the order 2 SCI carrying the bypass control information according to the resource-related configuration of the order 2 SCI.

Wherein the reference signal configuration of the 2-order SCI comprises at least one of: whether a specific Reference Signal is included in the 2 nd-order SCI (e.g., the specific Reference Signal may include a Demodulation Reference Signal (DMRS), time-domain resources and/or frequency-domain resources of the specific Reference Signal; Channel State Information-Reference Signal (CSI-RS)); a time domain pattern of a DMRS of order 2 SCI; a frequency domain pattern of a DMRS of the order 2 SCI; a time domain pattern of CSI-RS of a 2 nd order SCI; frequency domain pattern of CSI-RSI for order 2 SCI.

The time-domain and/or frequency-domain pattern may include a plurality of available patterns, and may further include one or more patterns of the plurality of available patterns that are configured to the UE or to a bypass transmission that satisfies a certain condition (e.g., a bypass transmission whose traffic priority exceeds a threshold).

Optionally, the UE assumes that the entire contents of the reference signal configuration of the order 2 SCI conform to at least one of: the same reference signal configuration as the 1 st order SCI; the same as the reference signal configuration of the psch. Optionally, the UE assumes that part of the content of the reference signal configuration of the 2 nd order SCI conforms to at least one of the above items, and obtains the rest of the content of the reference signal configuration of the 2 nd order SCI from the configuration of the 2 nd order SCI. For example, the UE assumes that the time domain pattern and the frequency domain pattern of the DMRS of the 2 nd order SCI are the same as those of the psch, and acquires the CSI-RS related reference signal configuration from the configuration of the 2 nd order SCI.

Specifically, the UE determines a reference signal generated when the 2-order SCI is transmitted according to the reference signal configuration of the 2-order SCI, and may transmit the generated reference signal when the 2-order SCI is transmitted; and/or when the UE determines to measure the bypass channel according to the reference signal configuration of the 2-order SCI, determining whether to measure the 2 nd-order SCI, and if determining to measure the 2 nd-order SCI, further determining the information of the reference signal for measuring the 2 nd-order SCI; and/or the UE determines the reference signal of the 2-order SCI carrying the bypass control information when receiving the bypass transmission according to the reference signal configuration of the 2-order SCI.

Further, the power control parameter configuration of the 2-order SCI includes at least one of: configuring power control parameters of 1 st-order SCI; configuring power control parameters of the 2 nd-order SCI; power offset (power offset) between the 1 st-order SCI and the 2 nd-order SCI; power offset between 1 st order SCI and psch; power offset between SCI of order 2 and psch. Optionally, the power offset comprises at least one of: a power offset between Resource Elements (REs); power offset between reference signals; the power offset between the information RE and the reference signal.

Optionally, the indication of the power control parameter configuration of the 2 nd order SCI comprises at least one of: specific parameters (e.g., values of power offset between the 2 nd order SCI and the psch) are fixed in the protocol (indicating whether the parameter is enabled or not in the power control parameter configuration of the 2 nd order SCI); indicating in a higher layer signaling (the higher layer signaling can be indicated to the bypass UE by the base station and/or indicated to the bypass receiving end UE by the bypass sending end UE); indicating in physical layer signaling (the physical layer signaling includes DCI indicated by the base station to the bypass UE, bypass grant (including dynamic grant and configured grant) indicated by the base station to the bypass UE, and SCI (including 1 st order SCI and 2 nd order SCI) indicated by the bypass sender UE to the bypass receiver UE).

Further, in the indication of the power control parameter configuration of the 2 nd-order SCI, the indication of the power offset includes an explicit (explicit) indication and an implicit (implicit) indication; the explicit indication further includes indicating a power offset in dB using a particular domain; implicit indication further includes indicating a power control parameter using a particular domain, which can be used to calculate a power offset.

Specifically, the UE determines the transmission power of the 2-order SCI and/or the psch when sending the bypass transmission according to the power control parameter configuration of the 2-order SCI; and/or the UE determines the transmission power of the 2-order SCI and/or PSSCH measured when the bypass channel is measured according to the power control parameter configuration of the 2-order SCI; and/or the UE determines the transmission power of the 2-order SCI and/or the PSSCH received when the bypass transmission is received according to the power control parameter configuration of the 2-order SCI.

The conditions under which the 2 nd order SCI is enabled include at least one of: the traffic priority meets certain conditions (e.g., above a certain threshold, below a certain threshold, not exceeding a certain threshold, not falling below a certain threshold); the identity of the receiving UE meets certain conditions (the identity of the receiving UE can be characterized by a target ID, so an example is that the target ID is in a specific target ID set); the content of the bypass control information SCI meets a specific condition (e.g., the content of the SCIs all have corresponding fields in the 1 st-order SCI, that is, the 2 nd-order SCI is not enabled when all the content of the SCIs can be carried by the 1 st-order SCI, otherwise, the 2 nd-order SCI is enabled).

Optionally, the specific condition mentioned above is determined based on at least one of the following parameters: traffic priority (which may be determined by QoS), traffic type (unicast/multicast/broadcast), target UE identity, channel type of SCI order 2, time and/or frequency domain size of the resource of SCI order 2, information indicated in SCI.

Further, when measuring the bypass channel, measuring or processing the bypass channel or bypass resource corresponding to the SCI of order 2 accordingly includes: when determining the resources for transmitting the bypass data, channel sensing (sensing) is performed according to the configuration of the 2-order SCI, and the resources for transmitting the bypass data are determined according to the sensing result.

In the LTE prior art, in the process of sensing a bypass channel, determining that the bypass resource meeting a first preset condition cannot be used for transmitting a physical bypass shared channel PSSCH according to a measurement result of the bypass channel; determining, according to the sensing result, a bypass resource used for transmitting the psch may specifically include: frequency domain size L of UE according to PSSCH_subCHAnd a perceptual time-domain reference point n, at a time interval n + T₁,n+T₂]Determining a candidate resource set (the size of the candidate resource in the time domain is always 1 LTE subframe, and is also called a candidate single subframe resource), wherein the total number of the candidate resources in the candidate resource set is M_total(ii) a Will gather S_AIs initialized to a candidate resource set comprising all candidate resources and is started at S_AExcluding the candidate resource meeting the predetermined condition, and adjusting the parameters of the predetermined condition to ensure the S after the exclusion_AThe number of the candidate resources contained in the resource list is not less than 0.2. M_total(ii) a Determination of S_AS-RSSI of the candidate resource in the set, S being based on S-RSSI_ARank of candidate resources withinSelecting the 0.2. M with the lowest S-RSSI_totalA candidate resource as a set S_B(ii) a Will S_BAnd reported to higher layers for final determination of psch resources.

In LTE prior art, at S_AIn the step of excluding the candidate resource meeting the predetermined condition, the UE will exclude the candidate resource R satisfying all the following conditions_x,y：

(1) UE in subframe

SCI format 1 is received, and a resource reservation (resource reservation) field and a priority field within the received SCI format 1 indicate P_{rsvp_RX}And prio_RX；

(2) PSSCH-RSRP measurement exceeding a threshold according to SCI format 1

(3) In sub-frame

Received SCI format 1 or hypothesis may be in a subframe

Received SCI format 1 determines the resource block RB and subframe set, which is associated with

Overlap (meaning in this step, in sub-frame

PSSCH resources and R indicated in received SCI Format 1_x,yOverlapping; or in a sub-frame

The received PSSCH corresponding to SCI format 1 is blindly retransmitted or transmitted in the next periodic transmission, namely in the sub-frame

PSSCH resources and R indicated in received SCI Format 1_x,yCoincident).

In the LTE prior art, since SCI of order 2 is not supported, the sensing process only considers how to sense and determine the psch resource based on one SCI. If the UE is configured to use the 2-level SCI, it needs to be determined whether and how the UE processes the 2-level SCI in the sensing process, except for sensing based on the 1 st-level SCI, as follows:

one of the simplest methods is that the SCI of order 2 is not measured in the channel sensing process, the psch resource is determined only according to the information indicated in the SCI of order 1 and the psch-RSRP measurement, and the SCI of order 2 is further determined according to a predetermined mapping relationship between the psch and the SCI of order 2 and based on the psch resource.

The advantage of this approach is the lower complexity, the disadvantage is that the channel of order 2 SCI cannot be perceived and the appropriate order 2 SCI and/or psch resources are selected accordingly. The disadvantage of this method is particularly significant when the 2 nd order SCI is carried by an independent control channel, because the resource location of the 2 nd order SCI and the resource location of the PSSCH in this scenario can have relatively flexible mapping, thereby supporting that when the bypass transmission occupies multiple bypass sub-channels, the UE determines different control channel resources through the channel perception of the 2 nd order SCI to avoid the collision of the 2 nd order SCI.

An enhanced method is to incorporate the 2 nd order SCI-RSRP measurement also into the RSRP measurement in the channel sensing process, and the step of RSRP measurement includes: the 2 nd order SCI is measured as part of the psch.

The method can improve the accuracy of channel sensing and the performance of 2 nd-order SCI transmission to a certain extent. However, since no distinction is made between RSRP measurements of the SCI of order 2 and the PSSCH, the method is not accurate enough when the interference situation of the SCI of order 2 and the PSSCH is different (typical scenario is that the PSSCH spans multiple frequency domain sub-channels and the SCI of order 2 is transmitted on a part of the sub-channels).

Another way to further enhance is to take the 2 nd order SCI-RSRP measurement as part of the RSRP measurement in the channel sensing process; and/or, channel sensing is performed not only according to information indicated in the 1 st-order SCI but also according to information indicated in the 2 nd-order SCI. The details will be described below.

In a bypass communication system, when a UE needs to transmit bypass data at least under Mode 2 in which the UE autonomously determines resources, determining a pscch resource for transmitting the bypass data according to a result of channel sensing (sensing), includes: frequency domain size L of UE according to PSSCH_subCHAnd/or temporal size, and at a time interval n + T based on a perceived temporal reference point n₁,n+T₂]Internally determining a candidate resource set; will gather S_AIs initialized to a candidate resource set comprising all candidate resources and is started at S_AExcluding the candidate resources meeting the predetermined condition; according to a predetermined criterion of S_AThe candidate resources in the cluster are sorted, and a plurality of the candidate resources are selected as a set S_B(ii) a Based on the set S_BThe psch resources for actual transmission are determined.

Wherein S is_AAnd/or S_BIncluding candidate resources for the psch and/or candidate resources for the order 2 SCI. For S_AIncluding PSSCH candidate resources and 2 nd order SCI candidate resources, S can also be considered_ACorresponds to S_A-1And S_A-2Two sets respectively including candidate resources of PSSCH and candidate resources of SCI of 2 nd order; accordingly, the generated set S_BAlso corresponds to S_B-1And S_B-2Two sets, respectively including candidate resources for the PSSCH and candidate resources for the order 2 SCI.

Wherein at S_AThe step of excluding the candidate resource meeting the predetermined condition includes: ensuring S after elimination by adjusting parameters of predetermined conditions_ADoes not fall below a certain percentage of the number of candidate resources in the initial set of candidate resources.

Wherein the predetermined criterion is S_AThe candidate resources in the cluster are sorted, and a plurality of the candidate resources are selected as a set S_BFurther comprising: determination of S_ABypass Received signal strength indication (S-RSSI) of candidate resources withinSignal Strength Indicator) of S according to S-RSSI_AThe candidate resources in the set are sorted, and the candidate resources with the lowest S-RSSI in a specific percentage or a specific number are selected as a set S_B. Optionally S for sorting_AThe candidate resources in the candidate resource list are PSSCH candidate resources, or level 2 SCI candidate resources, or PSSCH candidate resources and level 2 SCI candidate resources (in this scenario, the two types of candidate resources are respectively sorted, and/or respectively selected by a specific percentage or a specific number).

Wherein at S_AThe step of excluding the candidate resource meeting the predetermined condition further comprises: the UE will exclude candidate resources R that satisfy all, or a particular combination of, the following conditions_x,y：

UE is in time slot

Receiving the 1 st order SCI;

UE is in time slot

Receiving the 2 nd order SCI;

the Reference Signal Received Power (RSRP) of the PSSCH on the candidate resource and/or the RSRP of the second-order SCI meet a second preset condition;

the PSSCH on the candidate resource is a PSSCH associated with the first-order SCI and/or the second-order SCI;

the candidate resources overlap with the PSSCH resources indicated in the first-order SCI and/or the second-order SCI;

the candidate resources overlap with resources of a second-order SCI indicated in the first-order SCI;

the candidate resources overlap with resources used by the second-level SCI associated with the first-level SCI.

The psch resource and/or the SCI resource of order 2 indicated in the SCI may be a psch resource and/or an SCI resource of order 2 associated with the SCI, or may be a psch resource and/or an SCI resource of order 2 reserved by the SCI.

Wherein any combination of the above conditions is predefined or higher-level configured/preconfigured; it can be applied to all bypass transmissions or to UE-specific/cell-specific/resource pool-specific/parameter-specific bypass transmissions. Wherein the specific parameter comprises at least one of: service priority, service type, service delay.

For example, transmission with high service priority requires higher reliability, so when channel sensing is performed, more restriction conditions are used for resource exclusion; for example, a transmission with more stringent delay requirements needs to be sent as soon as possible, so that less restrictive conditions are used to obtain the earliest possible available resources when channel sensing is performed.

Wherein, according to the received 1 st order SCI, the RSRP of PSSCH and 2 nd order SCI is measured, and the measurement result exceeds a specific RSRP threshold, further comprising at least one of:

both conditions (PSSCH measurements exceeding a certain PSSCH-RSRP threshold, and measurements of order 2 SCI exceeding a certain order 2 SCI-RSRP threshold) are met;

satisfying any one of two conditions (PSSCH measurement exceeding a particular PSSCH-RSRP threshold, and measurement of 2 nd order SCI exceeding a particular 2 nd order SCI-RSRP threshold);

and multiplying the PSSCH measurement result and the 2 nd-order SCI measurement result by corresponding weights respectively and then adding the PSSCH measurement result and the 2 nd-order SCI measurement result, wherein the obtained result exceeds a specific RSRP threshold value.

Wherein, the corresponding weight may be 1, that is, the PSSCH measurement result and the 2 nd order SCI measurement result are directly added; of course other values are possible. The corresponding weight may also be configured by a higher layer, or pre-configured by a higher layer, or predefined by a higher layer, or derived and determined according to parameters configured by a higher layer, or pre-configured by a higher layer, or predefined by a higher layer, and/or according to parameters related to the service (e.g. priority of the service, type of service (broadcast/unicast/multicast), etc.).

Alternatively, the 1 st order SCI may be defined as a specific 1 st order SCI format, and the 2 nd order SCI may be defined as a specific 2 nd order SCI format.

Optionally, the specific RSRP threshold is predefined, and may also be higher layer configured or preconfigured; alternatively, the specific RSRP threshold is determined based on information indicated in the received 1 st order SCI and/or 2 nd order SCI; alternatively, the specific RSRP is determined according to the indicated traffic priority and/or based on the traffic priority of the pschs that the transmitting end needs to transmit.

Optionally, the UE is in S_AAfter PSSCH candidate resources meeting the preset conditions are eliminated, candidate resources of the 2 nd order SCI related to the PSSCH candidate resources are correspondingly eliminated; and/or the UE is in S_AAfter excluding the candidate resource of the 2 nd order SCI meeting the predetermined condition, the PSSCH candidate resource associated with the candidate resource of the 2 nd order SCI is also correspondingly excluded.

Optionally based on the set S_BDetermining PSSCH resources for actual transmission, including: will S_BReporting to the high layer based on the set S_BThe psch resources for actual transmission are determined. Further comprising, in the set S_BPreferably, this condition is fulfilled (the 2 nd order SCI candidate resource associated with the psch candidate resource is also included in the set S_BMedium). Further, based on the set S_BAfter determining the PSSCH resource for actual transmission, is included in the set S_BAnd among the 2 nd order SCI resources associated with the psch for actual transmission, the 2 nd order SCI resources for actual transmission are determined.

Optionally, S is based on S-RSSI_AThe candidate resources in the set are sorted, and the candidate resources with the lowest S-RSSI in a specific percentage or a specific number are selected as a set S_BFurther comprising at least one of:

according to S-RSSI as S_AThe PSSCH candidate resources in the set are sorted, and the PSSCH candidate resource with the lowest S-RSSI in a specific percentage or a specific number is selected as a set S_B；

According to S-RSSI as S_AThe 2 nd order SCI candidate resources in the set are sorted, and the 2 nd order SCI candidate resources with the lowest S-RSSI specific percentage or specific number are selected as a set S_B；

For the 2 nd order SCI candidate resource and PSSCH candidate resource which are correlated with each other, the S-RSSI of the SCI candidate resource and the PSSCH candidate resource are multiplied by respective weights and are combinedAdding, according to the result of the addition being S_AThe { PSSCH candidate resource, SCI candidate resource of 2 nd order } pairs in the list are sorted;

if a PSSCH candidate resource is included in the set S_BAdding S-RSSI of the 2 nd order SCI candidate resource not higher than the threshold or the order of the S-RSSI not lower than the specific threshold after sorting into S_B；

If a candidate resource of order 2 is included in the set S_BAdding PSSCH candidate resources with S-RSSI not higher than a threshold value or S-RSSI sequencing not lower than a specific threshold value into S_B。

Optionally, the UE is in S_AIn the step of excluding PSSCH candidate resources meeting a predetermined condition, and/or based on the set S_BThe step of determining the psch resource for actual transmission further comprises at least one of:

if all associated level 2 SCI resources of a PSSCH candidate resource are not included in the set S (S is S)_AOr S_B) Excluding the PSSCH candidate resource from S;

if all associated PSSCH resources of a level 2 SCI candidate are not included in the set S, the level 2 SCI candidate is excluded from the set S.

In the above method, S is_AA specific method of the step of excluding the candidate resource meeting the predetermined condition.

In one example, S_ACandidate resource (S) including PSSCH_A-1) And candidate resource (S) of SCI of 2 nd order_A-2). The UE receives the following SCIs in multiple slots:

the 1 st order SCI-A and the 2 nd order SCI-A are associated to the same PSSCH-A;

SCI-B, associated to PSSCH-B and not associated with a 2 nd order SCI, i.e., SCI-B corresponding to bypass transmission does not use a 2 nd order SCI; for convenience of description, it is also referred to as 1 st order SCI.

The UE measures the RSRP of the associated PSSCH according to the received 1 st order SCI and measures the RSRP of the 2 nd order SCI. Specifically, the RSRP of PSSCH-A, PSSCH-B, SCI-A2 nd order, is measured. For transmissions using a 2-order SCI, if the RSRP measurement results of a PSSCH corresponding to a 1 st-order SCI and a 2 nd-order SCI multiplied by a weight and summed exceed a certain RSRP threshold, the UE excludes the PSSCH and 2 nd-order SCI candidate resources indicated in the 1 st-order SCI or associated with the 1 st-order SCI. For transmissions that do not use a SCI of order 2, the UE excludes the psch indicated in or associated with an SCI of order 1 if the psch-RSRP measurement corresponding to that SCI of order 1 exceeds a certain RSRP threshold. In addition, the UE may also exclude the candidate resource and/or adjust a parameter (e.g., a value of the threshold) of the predetermined condition according to other predetermined conditions.

After RSRP measurement and elimination of candidate resources according to all received SCIs, the UE determines S_AS-RSSI of the candidate resource in the set, S being based on S-RSSI_AThe PSSCH candidate resources and the 2 nd order SCI candidate resources in the PSSCH are sorted respectively. The UE selects x% PSSCH candidate resources with the lowest S-RSSI from all PSSCH candidate resources as a set S_B(ii) a Then, the y% PSSCH candidate resources with the lowest S-RSSI of all 2 nd-order SCI candidate resources are added into S_B。

If the actual transmission of the UE requires the use of the order 2 SCI and can use mutually independent order 2 SCI resources and PSSCH resources, the UE can directly S_B'Determines the psch resources and order 2 SCI resources used for actual transmission. Otherwise, if the actual transmission of the UE needs to use the SCI of order 2 and needs to use the associated SCI resource of order 2 and psch resource, then:

UE in set S_BThe 2 nd order SCI candidate resource of which it is determined to be associated is also included at S_BPSSCH candidate resource set S in_B'(ii) a If S is_B'Is less than a certain threshold, the UE may adjust the parameters (e.g., RSRP threshold, x%, y%) in the previous step and repeat the previous step until S_B'The number of candidate resources in (1) is not less than a specific threshold. Subsequently, the UE is at S_B'Is determined for actual transmission and is associated with the psch resource and is also included at S_B'In the 2 nd order SCI candidate resource determinationOn the actual transmitted level 2 SCI resources.

Alternatively, for the above three methods, if only one method is supported in the final system, the UE assumes that it is always used. Otherwise, if the above at least two methods are supported in the system, the UE selects one method among the above at least two supported methods according to a predetermined condition.

In the prior art of LTE and NR, for communication using retransmission, performance of decoding data can be improved by combining data retransmitted for a plurality of times. For bypass communication using the 2 nd-order SCI technique, since the information bit number of the 2 nd-order SCI may be large, and the content of the control information different from that indicated in the 1 st-order SCI may frequently change, and the content of the control information indicated in the 2 nd-order SCI may be relatively static, a method similar to that of receiving data may also be used to improve the performance of decoding the 2 nd-order SCI by combining the 2 nd-order SCIs retransmitted for a plurality of times.

Receiving the SCI or the SCI of order 2 carrying the bypass control information when receiving the bypass control information and/or the bypass data, respectively, may further include: when a bypass transmission using a 2-order SCI is received, a plurality of 2-order SCIs received in a plurality of bypass transmissions are combined. Wherein combining the plurality of 2-order SCIs received in the multiple bypass transmissions comprises combining the plurality of 2-order SCIs and/or 1-order SCIs received in the multiple bypass transmissions, that is, comprises: combining only multiple 2 nd order SCIs, not combining 1 st order SCIs, and may: combining the 1 st order SCI and combining the 2 nd order SCI.

The UE assumes that when multiple pschs carry information that is multiple retransmissions of the same bypass transport block TB, the multiple 2-order SCIs associated with the multiple pschs can be combined. Optionally, the UE assumes that the information carried by the pschs is multiple retransmissions of the same bypass transport block TB, and the content of the multiple 2-level SCIs associated with the pschs is the same, the multiple 2-level SCIs associated with the pschs may be combined. Alternatively, the UE may assume that the information carried by the PSSCHs is multiple retransmissions of the same bypass transport block TB, and the content of the multiple 2-level SCIs associated with the PSSCHs is different, but the UE may determine how the content of each of the multiple 2-level SCIs may change, and the multiple 2-level SCIs associated with the PSSCHs may be combined.

The following is described with reference to specific examples: in a typical application scenario, the sending UE uses 4 blind retransmissions, where redundancy versions RV of the 4 blind retransmissions are {0,2,3,1} respectively, and the currently used RV is indicated in the 2 nd-order SCI of each blind retransmission. The sending end UE indicates the resource positions used by all blind retransmissions in each blind retransmission, that is, the control information of one blind retransmission indicates not only the resource position of the one blind retransmission but also the resource positions of other blind retransmissions. Therefore, the receiving-end UE can determine at which resource locations, the transmitting-end UE will perform the blind retransmission for the number of times, and accordingly, what value the RV field in the 2 nd-order SCI should take in each blind retransmission. In this scenario, in 4 times of blind retransmission of the transmitting end UE, the 4 2 nd-order SCIs have no change in other fields except for the RV field. Therefore, the receiving UE assumes that the 4 SCIs of order 2 in the 4 blind retransmissions can be merged.

If the UE assumes that multiple 2-order SCIs associated with multiple pschs can be combined when information carried by the multiple pschs is multiple retransmissions of the same bypass transport block TB, the process of receiving bypass data by the UE includes: attempting to decode the 1 st order SCI; if the order 1 SCI is successfully decoded, attempting to decode the order 2 SCI (including decoding after merging the order 2 SCI with other order 2 SCIs that have been received and may be merged); if the order 2 SCI is successfully decoded, an attempt is made to decode the PSSCH (including decoding after combining the PSSCH with other PSSCHs that have been received and can be combined). The method for the UE to determine whether the PSSCH can be combined and how to combine the PSSCH is not described in detail.

One important motivation for introducing the SCI mechanism of order 2 on the basis of the single SCI mechanism in the prior art is to reduce the overhead of UE blind detection. To maximize this effect, in the 2-level SCI mechanism, the 1 st-level SCI indicates information that the UE needs to perform blind detection and should also indicate information that is needed to decode the 2 nd-level SCI; accordingly, after the receiving end UE successfully decodes the 1 st-order SCI, if it is determined that the 2 nd-order SCI needs to be decoded, the information required for decoding the 2 nd-order SCI can be obtained from the 1 st-order SCI, so that the 2 nd-order SCI does not need to be detected in a blind manner subsequently. Accordingly, if the order 2 SCI is enabled for bypass transmission, information required to instruct the UE to decode the order 2 SCI is required in the order 1 SCI accordingly.

Given the motivation for the introduction of the 2 nd order SCI technique, the transmission of the 2 nd order SCI is practically unnecessary when all the information included in the SCI needs to be indicated in the 1 st order SCI. Thus, dynamically determining whether to use the order 2 SCI in one bypass transmission helps to further reduce overhead (overhead) of the system. It may also be indicated in the SCI of order 1 whether there is an associated SCI of order 2 (which may also be referred to as an SCI of order 2 associated to the same psch).

The UE transmits a psch and its associated SCI using at least the 1 st order SCI and may indicate in the 1 st order SCI whether there is an associated 2 nd order SCI. The indication may be explicit or implicit, the explicit indication comprising a 1-bit indication in the 1 st order SCI, the implicit indication comprising an indication by at least one of: indicating by the resource location of the 1 st order SCI, indicating by the reference signal of the 1 st order SCI, indicating by the format of the 1 st order SCI, indicating by other content indicated in the 1 st order SCI.

When the UE transmits a PSSCH and an SCI associated with the PSSCH, if a 2-order SCI is used, the UE indicates information related to the 2-order SCI in the 1-order SCI; and/or when the UE receives a PSSCH and an SCI associated with the PSSCH or blindly detects an SCI carried in the PSCCH, if a 2-order SCI is used, the UE assumes that information related to the 2-order SCI is indicated in the 1 st-order SCI.

Wherein the information related to the 2 nd order SCI includes at least one of:

configuration of SCI of level 2; may be a partial configuration or a full configuration; and may only be indicated when certain conditions are met; for example, the UE may indicate the configuration only when a UE-specific 2-order SCI configuration is used, or the UE may indicate the configuration only when a dynamic 2-order SCI configuration is used. Wherein the dynamic 2-order SCI configuration comprises a 2-order SCI configuration acquired by the UE in physical layer signaling;

resource location of SCI of order 2; may only be indicated when the psch in the bypass transmission meets a predetermined condition (e.g., the number of subchannels occupied by the psch is greater than a threshold);

reference signal configuration for the 2 nd order SCI; the indication may be only when the base station configures multiple reference signal configurations and dynamically schedules one of the reference signal configurations for one-time bypass transmission, and/or when the base station configures multiple reference signal configurations and the UE dynamically selects one of the reference signal configurations for one-time bypass transmission; optionally, the reference signal configuration at least includes a time domain and/or frequency domain pattern of the DMRS, and may further include indication information of whether the CSI-RS exists, and if the CSI-RS exists, the reference signal configuration may further include a time domain and/or frequency domain pattern of the CSI-RS when the CSI-RS exists;

configuring power control parameters of the 2 nd-order SCI;

whether a specific one or more domains exist in the 2 nd order CSI; including an explicit indication including indicating in the 1 st order SCI whether a specific M field in the 2 nd order SCI exists with N bits, and an implicit indication including indirectly indicating whether the specific M field in the 2 nd order SCI exists according to the indication in the 1 st order SCI and/or a configuration of bypass transmission; for the latter (i.e., implicit indication), a typical example is: when the 1 st order SCI indicates that the transmission is multicast and/or the feedback mode corresponding to the transmission is that only NACK is sent, a domain for indicating the geographical location information exists in the 2 nd order SCI; otherwise, no domain for indicating geographical location information exists in the SCI of order 2.

Optionally, for the bypass transmission scheduled by the base station, the information related to the 2 nd order SCI indicated in the 1 st order SCI sent by the UE is obtained by the UE from the scheduling signaling of the base station. Optionally, for the bypass transmission scheduled by the base station, if the specific information related to the 2 nd order SCI is obtained from the scheduling signaling of the base station, the sending-end UE indicates the specific information in the 1 st order SCI, otherwise, the specific information is not indicated in the 1 st order SCI. The scheduling signaling of the base station includes a bypass grant and/or other DCI.

Furthermore, considering that SCIs may be used to reserve bypass resources, one possible scenario is that the UE transmits one SCI, but not its associated PSCCH, which SCI is only used to reserve subsequent PSCCH and PSCCH resources. This transmission may be referred to as stand alone SCI. The disadvantage of this scenario is that once the independent SCI occupies the PSCCH resources, it is likely that the PSCCH resources associated with this PSCCH are also unavailable for use by other UEs, otherwise collisions may occur. However, the resource selection method under the scenario may be further enhanced to avoid the situation, for example, when other UEs transmit the pschs, if the pschs of the other UEs need to occupy multiple psch subchannels and the psch resources associated with the psch subchannels and the PSCCH resources associated with the PSCCH resources occupied by the independent SCIs do not overlap or do not completely overlap, the other UEs may use the psch resources associated with the PSCCH resources occupied by the independent SCIs as candidate resources. The main advantages of the independent SCI are: the SCI with smaller frequency domain size can occupy the resource with larger frequency domain size, so the resource reservation consumes relatively less resource and can benefit from the resource reservation in advance.

If the UE is supported in the system to send the independent SCI, the UE needs to further indicate whether the sent SCI is an independent SCI. Optionally, the UE indicates in the SCI whether there is an associated psch, including at least one of: the UE indicates in the 1 st order SCI whether there is an associated psch; the UE indicates in the SCI of order 2 whether there is an associated psch.

Whether the UE indicates the presence of the associated psch in the 1 st order SCI or the 2 nd order SCI, the indication may include an explicit indication and/or an implicit indication. Wherein the explicit indication includes indicating whether the associated PSSCH exists by using 1 bit in the SCI, the implicit indication includes indirectly indicating that the associated PSSCH does not exist by using a specific value in a resource allocation domain in the SCI, and indirectly indicating that the associated PSSCH exists by using other values. In the embodiment of the present application, the indication manner for indicating whether the associated PSSCH exists in the SCI is not limited.

In the above embodiment, a method for transmitting a 2 nd-order SCI of bypass communication is introduced to solve the problem of the prior art that a specific mechanism for transmitting a 2 nd-order SCI is lacking.

Further, in the NR V2X system, the bypass grant may be DCI or DCI activation/release, but in the prior art, the UE cannot provide a feedback message for the DCI of the bypass grant and the DCI of the activation bypass grant, so that reliability of the bypass grant cannot be guaranteed, and performance of bypass transmission may be affected. In order to solve the problem, the embodiment of the present application further provides a transmission method for providing a feedback message for the UE for the activation of the bypass grant or the bypass grant. See the examples below for details.

In the transmission Mode (Mode 1) in which the base station schedules the bypass transmission, the UE acquires information related to the SCI of order 2 in addition to the information from the bypass grant.

Specifically, the UE acquires scheduling information indicated by the base station in the bypass grant.

Wherein the scheduling information comprises at least one of:

information related to the SCI of order 2;

the data carried by the PSSCH is indication information corresponding to first transmission or retransmission; optionally, by bypassing an NDI indication indicated in the grant;

bypassing the transmitted target UE identity; optionally, indicated by a destination id (destination id) indicated in the bypass grant;

bypassing the HARQ process used for transmission.

Among other things, for information related to the SCI of order 2, indicating the information in the bypass grant has the advantages that the base station can control how the UE transmits the SCI of order 2, including controlling the resources of the SCI of order 2 used by the UE and other transmission parameters, thereby improving the control capability of the base station on the bypass communication system, and allowing the base station to improve the transmission performance of the SCI of order 2 or reduce the overhead introduced by the SCI of order 2 by adjusting the transmission parameters (e.g., transmission power, resource size) and the like.

Optionally, the data carried by the psch is first transmitted or retransmitted, and is indicated by an NDI field, for example, by a toggle (toggle) indication of the NDI field using a method similar to that in the prior art. An advantage of indicating this information in the bypass grant is that the base station can control the relation between its scheduled bypass resources and the UE's transmissions, and by indicating this information, further the usage of the bypass resources indicated by the base station is defined for the UE. For example, the base station may schedule retransmission of the UE for a resource with a larger size (compared with a resource transmitted for the first time), so that the effect of the target code rate of transmission can be achieved after the retransmission resource with a smaller scheduling size is jointly calculated with the first transmission resource, and waste caused by scheduling of a large-size resource is avoided; or scheduling resources with smaller size, which ensures reliability of retransmission, and makes retransmission have lower code rate and higher probability of being successfully decoded compared with first transmission, thereby reducing probability of continuing retransmission of UE and reducing service delay.

The advantage of indicating this information in the bypass grant for the target UE identity of the bypass transmission is that the base station can control the direct relation between the bypass resource scheduled by the base station and the transmission target of the UE, and by indicating this information, the use of the bypass resource indicated by the base station is further defined for the UE. For example, the base station may schedule the same bypass resource for a UE communication pair with a relatively long geographic location, which requires the base station to indicate the identities of both sides of the communication pair when scheduling the resource, that is, to indicate the identity of the target UE.

For the HARQ process used for bypass transmission, optionally, scheduling N resources in the bypass grant, corresponding to M HARQ processes, explicitly indicating the IDs of the M HARQ processes by using M domains in the bypass grant; or 1 domain is used to indicate the ID of the first HARQ process in the M HARQ processes, and the ID of the M 'th HARQ process is the ID of the 1 st HARQ process + M' -1, i.e. the IDs of the M HARQ processes are consecutive. The former approach (i.e. indicating the IDs of the M HARQ processes with M domains) has the advantage of being more flexible, but introduces more overhead and can therefore be used when the number of HARQ processes scheduled in the bypass grant does not exceed a certain threshold; the latter method (only 1 field is used to indicate the ID of the first HARQ process among the M HARQ processes) is relatively less overhead, but it cannot schedule a discontinuous HARQ process, so it can be used when the number of HARQ processes scheduled in the bypass grant is large, or it is always used for system consistency.

In the conventional uplink and downlink communication of the Uu air interface (interface), the base station schedules uplink and downlink transmission through downlink grant and uplink grant, and the grant indicates that no UE needs to send acknowledgement information when the dynamic scheduling and the semi-static scheduling are activated, because the base station can quickly determine whether the UE correctly completes uplink transmission/downlink reception by whether the uplink transmission is received subsequently and whether HARQ-ACK feedback of the downlink transmission is received subsequently, and handle incorrect conditions (for example, the base station does not receive HARQ-ACK feedback of the downlink transmission, or the base station does not receive the uplink transmission). However, in the bypass communication scheduled by the base station, the base station schedules the bypass transmission by the bypass grant, and if the UE does not provide the acknowledgement information of the bypass grant similarly to the Uu, the base station cannot confirm whether the UE completes the bypass transmission correctly, because it is possible that the bypass transmission of the UE and the corresponding HARQ-ACK are transmitted on the bypass and the base station cannot monitor the signal on the bypass. Therefore, there is a need to introduce a mechanism for the UE to acknowledge the reception of the bypass grant to the base station for the bypass transmission mode scheduled by the base station.

After receiving the signaling which is sent by the base station and is used as the bypass authorization, the bypass UE sends confirmation information used for indicating whether the bypass authorization is successfully received to the base station on an uplink channel. The signaling as the bypass authorization carries the bypass authorization, that is, after receiving the signaling as the bypass authorization sent by the base station, the bypass UE obtains the carried bypass authorization by decoding.

Wherein the bypass authorization may include at least one of: dynamic authorization, authorization for type 1 configuration, and authorization for type 2 configuration.

Further, the signaling as a bypass grant comprises at least one of: DCI indicating a dynamic grant, DCI indicating a configured grant, PDSCH indicating a configured grant, DCI activating a configured grant, DCI releasing a configured grant.

Optionally, the bypass grant or the signaling as a bypass grant is a specific combination of the above items.

Further, after receiving signaling sent by the base station as the bypass grant, the bypass UE sends a PUCCH and/or a PUSCH to the base station on an uplink channel, and the PUCCH and/or the PUSCH carries acknowledgement information for indicating whether the bypass grant is successfully received.

Wherein the content of the confirmation information comprises at least one of the following:

HARQ-ACK information;

ACK/NACK information of a higher layer;

a MAC CE and/or RRC field dedicated to indicating whether a bypass grant was successfully received;

physical layer or higher layer signaling in certain existing mechanisms that is multiplexed to indicate whether a bypass grant, such as an SR/BSR, was successfully received;

and resources for assisting the base station to schedule the bypass information, such as a sensing result on a bypass channel, a channel busy rate CBR and a channel occupancy rate CR.

Alternatively, if the acknowledgement information is carried on the PUCCH, the content of the acknowledgement information includes: HARQ-ACK information; if the acknowledgment information is carried on the PUSCH, the contents of the acknowledgment information include: HARQ-ACK information of a higher layer.

Wherein the resources used by the acknowledgement information are determined based on at least one of:

a fixed resource mapping relationship between bypass authorization and acknowledgement information; for example, when the bypass grant is indicated in DCI and the acknowledgment information is carried on PUCCH, the resource used by the acknowledgment information is determined based on the fixed PDCCH-PUCCH mapping relationship and the PDCCH carrying the bypass grant;

bypassing resources indicated in the grant; for example, when the bypass grant is indicated in the DCI and the acknowledgement information is carried on the PUCCH, the PUCCH resource indicated by the method of multiplexing the existing mechanism is adopted in the DCI;

resources indicated in the uplink and/or downlink grants.

The above embodiments describe a processing method of bypass control information and a method of bypass transmission from the perspective of a method flow, and the following describes a user equipment from the perspective of a virtual module or a virtual unit, which may be used to execute the above method embodiments, specifically as follows:

an embodiment of the present application provides a user equipment, as shown in fig. 2, the user equipment 20 may include: a configuration acquisition module 21 and an execution operation module 22, wherein,

a configuration obtaining module 21, configured to obtain a configuration of the first bypass control information SCI and/or a configuration of the second SCI;

an executing operation module 22, configured to, based on the configuration of the first SCI and/or the configuration of the second SCI, execute at least one of the following operations:

transmitting the first SCI and/or the second SCI;

receiving the first SCI and/or the second SCI;

wherein the first SCI and the second SCI are associated.

In another possible implementation manner of the embodiment of the present application, when the execution operation module 22 sends the first SCI and/or the second SCI, it is specifically configured to: transmitting the first SCI and/or the second SCI associated with the bypass data when the bypass data is transmitted;

when measuring the bypass resource corresponding to the first SCI and/or the second SCI, the execution operation module 22 is specifically configured to: measuring a bypass channel and/or bypass resources corresponding to the first SCI and/or the second SCI when measuring the bypass channel;

the execution operation module 22, when receiving the first SCI and/or the second SCI, is specifically configured to: the first SCI and/or the second SCI carrying the bypass control information are received when the bypass control information and/or the bypass data are received.

In another possible implementation manner of this embodiment, the executing operation module 22 sends the second SCI in the resource related configuration based on the second SCI, and is specifically further configured to: determining a bypass channel and/or bypass resources for transmitting the second SCI based on the resource-related configuration of the second SCI; transmitting the second SCI according to the determined bypass channel and/or bypass resource for transmitting the second SCI;

the execution operation module 22 is configured to measure the bypass channel or the bypass resource corresponding to the second SCI when measuring the bypass channel based on the resource correlation configuration of the second SCI, and is specifically further configured to: determining a bypass channel and/or bypass resources for measuring the second SCI based on the resource-related configuration of the second SCI; according to the determination result, measuring a bypass channel and/or bypass resources corresponding to the second SCI when measuring the bypass channel;

the execution operation module 22, when receiving the second SCI carrying the bypass control information when receiving the bypass control information and/or the bypass data based on the resource-related configuration of the second SCI, is further specifically configured to: determining a bypass channel and/or bypass resource for receiving the second SCI carrying the bypass control information when receiving the bypass control information and/or the bypass data based on the resource related configuration of the second SCI; a second SCI carrying bypass control information is received upon receiving bypass control information and/or bypass data based on the determination.

In another possible implementation manner of the embodiment of the present application, when the execution operation module 22 sends the second SCI based on the reference signal configuration of the second SCI, the execution operation module is specifically configured to: generating a reference signal corresponding to the second SCI based on the reference signal configuration of the second SCI; transmitting a second SCI and the generated reference signal;

the execution operation module 22 is specifically configured to, when the reference signal configuration based on the second SCI is used to measure the bypass channel and/or the bypass resource corresponding to the second SCI when measuring the bypass channel: determining information for measuring a reference signal of the second SCI based on the reference signal configuration of the second SCI; according to the determination result, measuring a bypass channel and/or bypass resources corresponding to the second SCI when measuring the bypass channel;

the execution operation module 22, when receiving the second SCI carrying the bypass control information when receiving the bypass control information and/or the bypass data based on the reference signal configuration of the second SCI, is specifically further configured to: determining a reference signal of the second SCI carrying the bypass control information received when the bypass control information and/or the bypass data are received based on the reference signal configuration of the second SCI; a second SCI carrying bypass control information is received upon receiving bypass control information and/or bypass data based on the determination.

In another possible implementation manner of this embodiment, when the execution operation module 22 sends the second SCI based on the power control parameter configuration of the second SCI, the execution operation module is specifically configured to: determining the transmission power of the second SCI based on the power control parameter configuration of the second SCI; transmitting the second SCI according to the determined transmission power of the second SCI;

the execution operation module 22 is specifically configured to, when the bypass channel and/or the bypass resource corresponding to the second SCI is measured when the bypass channel is measured based on the power control parameter configuration of the second SCI: determining the measured transmission power of the second SCI based on the power control parameter configuration of the second SCI; according to the determination result, measuring a bypass channel and/or bypass resources corresponding to the second SCI when measuring the bypass channel;

the execution operation module 22 is specifically configured to, when receiving the second SCI carrying the bypass control information when receiving the bypass control information and/or the bypass data based on the power control parameter configuration of the second SCI: determining the transmission power of the received second SCI carrying the bypass control information based on the power control parameter configuration of the second SCI; upon receiving the bypass control information and/or the bypass data, receiving the second SCI carrying the bypass control information based on the determined transmission power of the received second SCI carrying the bypass control information.

In another possible implementation manner of the embodiment of the present application, the user equipment 20 further includes: a first determination module, wherein,

the first determining module is used for determining that the bypass resource meeting the first preset condition can not be used for transmitting the physical bypass shared channel PSSCH according to the measuring result of the bypass channel in the sensing process of the bypass channel after the bypass channel is measured; and determining a bypass resource for transmitting the PSSCH according to the sensing result.

the UE receives a first SCI in a first preset time slot;

the UE receives a second SCI in a second preset time slot;

the Reference Signal Received Power (RSRP) of the PSSCH on the candidate resource and/or the RSRP of the second SCI meet a second preset condition; the PSSCH on the candidate resource is a PSSCH associated with the first SCI and/or the second SCI;

In another possible implementation manner of the embodiment of the present application, the user equipment 20 further includes: a second determining module, a combining module, and a decoding module, wherein,

a second determining module, configured to determine, after receiving the plurality of second SCIs, a second SCI that can be merged in the plurality of second SCIs;

a merging module, configured to merge the determined combinable second SCI to obtain a merged second SCI;

and the decoding module is used for decoding the combined second SCI.

In another possible implementation manner of the embodiment of the present application, the second determining module is specifically configured to determine that the received multiple second SCIs are combinable second SCIs when the received multiple second SCIs are associated with multiple pieces of transmission and/or retransmission bypass control information and/or bypass data channels corresponding to the same bypass transport block; and/or determining the received multiple second SCIs as combinable second SCIs when the received multiple second SCIs are associated with multiple transmission and/or retransmission bypass control information and/or bypass data channels corresponding to the same bypass transport block, and the contents of the received multiple second SCIs meet a third preset condition.

In another possible implementation manner of the embodiment of the present application, when the execution operation module 22 sends the first SCI and/or the second SCI, it is specifically configured to: sending a first SCI indicating that there is no associated second SCI; and/or, transmitting the first SCI and the second SCI,

the first SCI indicating the existence of an associated second SCI and/or scheduling information indicating the associated second SCI;

the execution operation module 22, when receiving the first SCI and/or the second SCI, is specifically configured to: receiving a first SCI; and receiving the associated second SCI based on the indication when the first SCI indicates that the associated second SCI exists and/or scheduling information indicating the associated second SCI.

the resource location actually used by the second SCI;

the reference signal configuration actually used by the second SCI;

configuring power control parameters actually used by the second SCI;

In another possible implementation of the embodiments of the present application,

the resource-related configuration of the second SCI includes at least one of:

Compared with the prior art, the embodiment of the application provides user equipment, and the embodiment of the application acquires the configuration of a first piece of bypass control information SCI and/or the configuration of a second SCI, and then sends the first SCI and/or the second SCI based on the configuration of the first SCI and/or the second SCI; and/or measuring bypass resources corresponding to the first SCI and/or the second SCI based on the configuration of the first SCI and/or the configuration of the second SCI; and/or receiving the first SCI and/or the second SCI based on the configuration of the first SCI and/or the configuration of the second SCI; wherein the first SCI and the second SCI are associated such that transmission of the second SCI is enabled.

An embodiment of the present application further provides another user equipment, as shown in fig. 3, the user equipment 30 further includes: a receiving module 31 and a bypass transmission module 32, wherein,

a receiving module 31, configured to receive a bypass authorization signaling sent by a base station;

and a bypass transmission module 32 for performing bypass transmission based on the bypass grant.

In another possible implementation manner of the embodiment of the present application, the user equipment 30 further includes: a sending module for sending, wherein,

and the sending module is used for sending information used for indicating whether the bypass authorization signaling is successfully received to the base station.

In another possible implementation manner of the embodiment of the present application, the user equipment 30 further includes: a scheduling information acquisition module, wherein,

the scheduling information acquisition module is used for acquiring scheduling information from the bypass authorization signaling;

wherein the scheduling information comprises at least one of:

information associated with the second SCI;

the bypass transmission module 32 is specifically further configured to perform bypass transmission based on the scheduling information.

Compared with the prior art, the embodiment of the application provides the user equipment, and the bypass transmission can be performed based on the scheduling of the base station by receiving the bypass authorization signaling sent by the base station and then performing the bypass transmission based on the received bypass authorization.

The user equipment of this embodiment can execute the above method embodiments, and the implementation principle is similar, which is not described herein again.

An embodiment of the present application provides a user equipment, and as shown in fig. 4, a user equipment 4000 shown in fig. 4 includes: a processor 4001 and a memory 4003. Processor 4001 is coupled to memory 4003, such as via bus 4002. Optionally, the electronic device 4000 may further comprise a transceiver 4004. It should be noted that the transceiver 4004 is not limited to one in practical applications, and the structure of the user equipment 4000 is not limited to the embodiment of the present application.

Processor 4001 may be a CPU, general purpose processor, DSP, ASIC, FPGA or other programmable logic device, transistor logic device, hardware component, or any combination thereof. Which may implement or perform the various illustrative logical blocks, modules, and circuits described in connection with the disclosure. The processor 4001 may also be a combination that performs a computational function, including, for example, a combination of one or more microprocessors, a combination of a DSP and a microprocessor, or the like.

Bus 4002 may include a path that carries information between the aforementioned components. Bus 4002 may be a PCI bus, EISA bus, or the like. The bus 4002 may be divided into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one thick line is shown in FIG. 4, but this does not indicate only one bus or one type of bus.

Memory 4003 may be, but is not limited to, a ROM or other type of static storage device that can store static information and instructions, a RAM or other type of dynamic storage device that can store information and instructions, an EEPROM, a CD-ROM or other optical disk storage, an optical disk storage (including compact disk, laser disk, optical disk, digital versatile disk, blu-ray disk, etc.), a magnetic disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer.

The memory 4003 is used for storing application codes for executing the scheme of the present application, and the execution is controlled by the processor 4001. Processor 4001 is configured to execute application code stored in memory 4003 to implement what is shown in any of the foregoing method embodiments.

An embodiment of the present application provides a user equipment, and an electronic device in the embodiment of the present application includes: a memory and a processor; at least one program stored in the memory for execution by the processor, which when executed by the processor, implements: the embodiment of the application acquires the configuration of the first bypass control information SCI and/or the configuration of the second SCI, and then sends the first SCI and/or the second SCI based on the configuration of the first SCI and/or the second SCI; and/or measuring bypass resources corresponding to the first SCI and/or the second SCI based on the configuration of the first SCI and/or the configuration of the second SCI; and/or receiving the first SCI and/or the second SCI based on the configuration of the first SCI and/or the configuration of the second SCI; wherein the first SCI and the second SCI are associated such that transmission of the second SCI is enabled.

An embodiment of the present application provides a user equipment, where the user equipment includes: a memory and a processor; at least one program stored in the memory for execution by the processor, which when executed by the processor, implements: the embodiment of the application receives the bypass authorization signaling sent by the base station and then performs bypass transmission based on the received bypass authorization, thereby realizing the bypass transmission based on the base station scheduling.

The present application provides a computer-readable storage medium, on which a computer program is stored, which, when running on a computer, enables the computer to execute the corresponding content in the foregoing method embodiments. Compared with the prior art, the embodiment of the application acquires the configuration of the first bypass control information SCI and/or the configuration of the second SCI, and then sends the first SCI and/or the second SCI based on the configuration of the first SCI and/or the second SCI; and/or measuring bypass resources corresponding to the first SCI and/or the second SCI based on the configuration of the first SCI and/or the configuration of the second SCI; and/or receiving the first SCI and/or the second SCI based on the configuration of the first SCI and/or the configuration of the second SCI; wherein the first SCI and the second SCI are associated such that transmission of the second SCI is enabled.

The present application provides a computer-readable storage medium, on which a computer program is stored, which, when running on a computer, enables the computer to execute the corresponding content in the foregoing method embodiments. Compared with the prior art, the embodiment of the application receives the bypass authorization signaling sent by the base station and then performs bypass transmission based on the received bypass authorization, so that the bypass transmission based on the base station scheduling can be realized.

It is worth mentioning that: the technique in which the UE sends 2 associated SCIs for one psch is also referred to as 2-level SCI technique. Wherein, the 2 associated SCIs are the 1 st order SCI and the 2 nd order SCI, respectively. The 1 st-order SCI may be referred to as a first SCI, and the 2 nd-order SCI may also be referred to as a second SCI.

Further, the first SCI (SCI of order 1) and the second SCI (SCI of order 2) are not limited to temporal context but are logically related; for example, when the UE receives the bypass transmission using the 2 nd order SCI, the first SCI (1 st order SCI) is decoded and then the second SCI (2 nd order SCI) is decoded, but the two SCIs may be transmitted in the same slot or symbol, so there may be no temporal precedence between them.

Further, in the above embodiment, the "2 nd order" may include the 1 st order and the 2 nd order, and may also include only the 1 st order or the 2 nd order.

It should be understood that, although the steps in the flowcharts of the figures are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and may be performed in other orders unless explicitly stated herein. Moreover, at least a portion of the steps in the flow chart of the figure may include multiple sub-steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed alternately or alternately with other steps or at least a portion of the sub-steps or stages of other steps.

The foregoing is only a partial embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. A processing method of bypass control information, which is executed by a User Equipment (UE), includes:

transmitting the first SCI and/or the second SCI;

receiving the first SCI and/or the second SCI;

wherein the first SCI and the second SCI are associated.

2. The method of claim 1, wherein the sending the first SCI and/or the second SCI comprises:

transmitting a first SCI and/or a second SCI associated with bypass data when the bypass data is transmitted;

wherein, the measuring the bypass resource corresponding to the first SCI and/or the second SCI includes:

measuring a bypass channel and/or bypass resources corresponding to the first SCI and/or the second SCI when measuring the bypass channel;

wherein, the receiving the first SCI and/or the second SCI includes:

receiving a first SCI and/or a second SCI carrying bypass control information when receiving the bypass control information and/or bypass data.

3. The method according to claim 1 or 2, wherein the configuration of the second SCI comprises at least one of:

4. The method of claim 3 wherein transmitting the second SCI based on the resource-related configuration of the second SCI comprises:

determining a bypass channel and/or bypass resource for receiving the second SCI carrying the bypass control information when receiving the bypass control information and/or bypass data based on the resource related configuration of the second SCI;

receiving a second SCI carrying bypass control information when receiving the bypass control information and/or bypass data based on the determination result.

5. The method of claim 3 wherein transmitting the second SCI based on the reference signal configuration of the second SCI comprises:

generating a reference signal corresponding to a second SCI based on a reference signal configuration of the second SCI;

transmitting the second SCI and the generated reference signal;

the measuring of the bypass channel and/or the bypass resource corresponding to the second SCI when measuring the bypass channel based on the reference signal configuration of the second SCI includes:

determining information for measuring a reference signal of the second SCI based on the reference signal configuration of the second SCI;

wherein, based on the reference signal configuration of the second SCI, receiving the second SCI carrying the bypass control information when receiving the bypass control information and/or the bypass data, includes:

determining a reference signal of a second SCI carrying bypass control information received when the bypass control information and/or bypass data is received based on the reference signal configuration of the second SCI;

6. The method of claim 3 wherein transmitting the second SCI based on the power control parameter configuration of the second SCI comprises:

determining the transmission power of the second SCI based on the power control parameter configuration of the second SCI;

transmitting the second SCI according to the determined transmission power of the second SCI;

the measuring the bypass channel and/or the bypass resource corresponding to the second SCI when measuring the bypass channel based on the power control parameter configuration of the second SCI includes:

determining the measured transmission power of the second SCI based on the power control parameter configuration of the second SCI;

wherein, based on the power control parameter configuration of the second SCI, receiving the second SCI carrying the bypass control information when receiving the bypass control information and/or the bypass data, includes:

determining the transmission power of the received second SCI carrying the bypass control information based on the power control parameter configuration of the second SCI;

and when the bypass control information and/or the bypass data are received, receiving the second SCI carrying the bypass control information based on the determined transmission power of the second SCI carrying the bypass control information.

7. The method of claim 1, wherein after measuring the bypass channel, the method further comprises:

in the sensing process of the bypass channel, determining that the bypass resource meeting a first preset condition cannot be used for transmitting a physical bypass shared channel PSSCH according to the measurement result of the bypass channel;

and determining bypass resources for transmitting the PSSCH according to the sensing result.

8. The method according to claim 7, wherein the first preset condition comprises at least one of:

the UE receives a first SCI in a first preset time slot;

the UE receives a second SCI in a second preset time slot;

the Reference Signal Received Power (RSRP) of a PSSCH on a candidate resource and/or the RSRP of a second SCI meet a second preset condition, wherein the PSSCH on the candidate resource is a PSSCH associated with the first SCI and/or the second SCI;

9. The method according to claim 8, wherein the second preset condition comprises at least one of:

and the weighted result corresponding to the RSRP of the PSSCH on the candidate resource and the RSRP of the second SCI on the candidate resource is larger than a second preset RSRP threshold value.

10. The method of claim 1 wherein receiving the first SCI and/or the second SCI further comprises:

after receiving a plurality of second SCIs, determining combinable second SCIs in the plurality of second SCIs;

merging the determined second SCIs which can be merged to obtain a merged second SCI;

decoding the combined second SCI.

11. The method of claim 10 wherein the determining the combinable second SCIs of the plurality of second SCIs comprises at least one of:

determining the received second SCIs as the combinable second SCI if the received second SCIs are associated with bypass control information and/or bypass data channels of multiple transmissions and/or retransmissions corresponding to the same bypass transport block;

if the received multiple second SCIs are associated with multiple transmission and/or retransmission bypass control information and/or bypass data channels corresponding to the same bypass transport block, and the content of the received multiple second SCIs meets a third preset condition, determining that the received multiple second SCIs are the combinable second SCIs.

12. The method according to any of claims 1-11, wherein said sending the first SCI and/or the second SCI comprises at least one of:

sending a first SCI indicating that there is no associated second SCI;

wherein, the receiving the first SCI and/or the second SCI includes:

receiving a first SCI;

if the first SCI indicates that there is an associated second SCI and/or scheduling information indicating the associated second SCI, the associated second SCI is received based on the indication.

13. The method of claim 12 wherein the scheduling information of the second SCI includes at least one of:

the resource location actually used by the second SCI;

the reference signal configuration actually used by the second SCI;

configuring power control parameters actually used by the second SCI;

14. The method according to any of claims 1-13, wherein the resource-related configuration of the second SCI comprises at least one of:

15. A bypass transmission method, performed by a User Equipment (UE), comprising:

receiving a bypass authorization signaling sent by a base station;

and performing bypass transmission based on the bypass authorization signaling.

16. The method of claim 15, wherein the receiving the bypass grant signaling sent by the base station further comprises:

and sending information for indicating whether the bypass authorization signaling is successfully received to the base station.

17. The method according to claim 15 or 16, wherein the receiving the bypass grant signaling sent by the base station further comprises:

acquiring scheduling information from the bypass authorization signaling;

wherein the performing bypass transmission based on the bypass grant signaling comprises:

performing bypass transmission based on the scheduling information;

wherein the scheduling information comprises at least one of:

information associated with the second SCI;

and bypassing indication information corresponding to the hybrid automatic repeat request HARQ process used for transmission.

18. A user device, comprising:

an execution operation module, configured to execute at least one of the following operations based on the configuration of the first SCI and/or the configuration of the second SCI:

transmitting the first SCI and/or the second SCI;

receiving the first SCI and/or the second SCI;

wherein the first SCI and the second SCI are associated.

19. A user equipment, characterized in that it comprises:

one or more processors;

a memory;

one or more applications, wherein the one or more applications are stored in the memory and configured to be executed by the one or more processors, the one or more programs configured to: performing the method according to any one of claims 1 to 17.

20. A computer readable storage medium having stored thereon at least one instruction, at least one program, a set of codes, or a set of instructions, which is loaded and executed by a processor to implement a method according to any one of claims 1 to 17.