Terminal device and method

Abstract

To provide a method for supporting an advanced V2X service that can be classified into four use case groups of platooning, extended sensors, advanced driving, and remote driving.SOLUTION: The method determines a configuration of a resource set for time-division multiplexing in vehicle-to-everything (V2X) communication between first and second terminals. The resource set corresponds to a plurality of symbols in time domain. The configuration specifies that an automatic-gain-control signal, determined based on the control information for the V2X communication, transmits in an initial symbol of the plurality of symbols. The method also performs the V2X communication according to the configuration. As a result, the automatic gain control signal is accurately implemented when the physical sidelink shared channel and the physical sidelink control channel are time division multiplexed.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] FIELD Embodiments of the present disclosure relate generally to the field of telecommunications, and more particularly to methods, devices, and computer-readable media for sidelink communications. [Background technology]

[0002] Device-to-device (D2D) communications have been developed over the years and expanded to include vehicle-to-everything (V2X) communications. In current telecommunications standards, such as Release 14 of the Third Generation Partnership Project (3GPP) standards, the expansion of D2D work consists of support for V2X communications. V2X communications include any combination of direct communication between a vehicle and a pedestrian, infrastructure, or network, and can therefore be divided into four distinct types: vehicle-to-vehicle (V2V), vehicle-to-pedestrian (V2P), vehicle-to-infrastructure (V2I), and vehicle-to-network (V2N). V2V communication includes communication between vehicles, V2P communication includes communication between vehicles and devices carried by individuals (e.g., portable user terminals carried by pedestrians, cyclists, drivers, or passengers), V2I communication includes communication between vehicles and infrastructure supporting V2X applications such as roadside units (RSUs) of transportation infrastructure operators, and V2N communication includes communication between vehicles and network infrastructure such as network terminals.

[0003] In addition, New Radio (NR) V2X technology will support advanced V2X services that can be categorized into four use case groups: platooning, extended sensors, advanced driving, and remote driving. Summary of the Invention

[0004] Generally, exemplary embodiments of the present disclosure provide methods, devices, and computer-readable media for sidelink communications.

[0005] In a first aspect, an embodiment of the present disclosure provides a method implemented in a first terminal device. In the method, a configuration of resource sets for time division multiplexing (TDM) in V2X communication between a control channel and a data channel is determined. The resource sets correspond to a plurality of symbols in the time domain. The configuration specifies that an Automatic Gain Control (AGC) signal is to be transmitted in an initial symbol of the plurality of symbols. The AGC signal is determined based on control information for the V2X communication. In the method, the V2X communication according to the configuration is performed with a second terminal device.

[0006] In a second aspect, an embodiment of the present disclosure provides a terminal device, the terminal device comprising: a processor; and a memory coupled to the processor and storing instructions that, when executed by the processor, cause the terminal device to perform a method according to the first aspect.

[0007] In a third aspect, embodiments of the present disclosure provide a computer-readable medium having stored thereon instructions that, when executed by at least one processor, cause the at least one processor to perform a method according to the first aspect.

[0008] Other features of the present disclosure will become readily apparent from the following description. [Brief explanation of the drawings]

[0009] The above and other objects, features, and advantages of the present disclosure will become more apparent through a more detailed description of several embodiments of the present disclosure with reference to the accompanying drawings.

[0010] [Figure 1]1 is a schematic diagram of a communication network in which embodiments of the present disclosure may be implemented;

[0011] [Figure 2] 1 illustrates a schematic configuration of TDM subchannels of a physical sidelink control channel (PSSCH) and a physical sidelink shared channel (PSCCH) according to some embodiments of the present disclosure.

[0012] [Figure 3] 1 illustrates the composition of a SCORESET according to some embodiments of the present disclosure.

[0013] [Figure 4] 1 illustrates the composition of a SCORESET according to some embodiments of the present disclosure.

[0014] [Figure 5] 1 illustrates the composition of a SCORESET according to some embodiments of the present disclosure.

[0015] [Figure 6] FIG. 1 is a schematic diagram illustrating frequency division multiplexing of PSSCH and PSCCH according to some embodiments of the present disclosure.

[0016] [Figure 7] 1 illustrates a flowchart of a method for sidelink communication according to some embodiments of the present disclosure.

[0017] [Figure 8] FIG. 1 is a simplified block diagram of a device suitable for practicing embodiments of the present disclosure.

[0018] Throughout the drawings, the same or similar numbers refer to the same or similar elements. DETAILED DESCRIPTION OF THE INVENTION

[0019] The principles of the present disclosure will be explained with reference to some exemplary embodiments. It should be understood that these embodiments are set forth for illustrative purposes only, to aid those skilled in the art in understanding and practicing the present disclosure, without implying any limitation on the scope of the present disclosure. The disclosure described herein can be implemented in various ways other than those described below.

[0020] In the following description and claims, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.

[0021] As used herein, the term "network device" or "base station" (BS) refers to a device that can provide or host a cell or coverage area over which terminal devices can communicate. Examples of network devices include, but are not limited to, a Node B (NodeB or NB), an Evolved Node B (eNodeB or eNB), a new radio access Node B (gNB), a next generation Node B (gNB), a remote radio unit (RRU), a radio head (RH), a remote radio head (RRH), and low power nodes such as femto nodes and pico nodes. For illustrative purposes, some embodiments will be described below with reference to an eNB as an example of a network device.

[0022] As used herein, the term "terminal device" refers to any device with wireless or wired communication capabilities. Examples of terminal devices include, but are not limited to, User Equipment (UE), personal computers, desktops, mobile phones, cellular phones, smartphones, personal digital assistants (PDAs), portable computers, image capture devices such as digital cameras, gaming devices, music storage and playback devices, or Internet appliances that enable wireless or wired Internet access and browsing, etc.

[0023] As used herein, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The term "comprises" and variations thereof are read as open terms meaning "including, but not limited to." The term "based on" is read as "based at least in part on." The terms "one embodiment" and "embodiment" are read as "at least one embodiment." The term "another embodiment" is read as "at least one other embodiment." Terms such as "first," "second," etc. may refer to different objects or the same object. Other definitions, both explicit and implicit, are included below.

[0024] In some instances, a value, procedure, or device may be referred to as "best," "lowest," "highest," "minimum," "maximum," etc. Such descriptions are intended to indicate that a selection may be made from among many available functional options, and that such a selection is not necessarily better, smaller, more expensive, or more preferred than other options.

[0025] FIG. 1 illustrates an exemplary communication environment 100 in which embodiments of the present disclosure can be implemented. In the environment 100, vehicles 110-1 through 110-3 and personal mobile devices 110-4 are terminal devices (collectively or individually referred to as terminal devices 110) and can communicate with each other. A cellular network device 120 is also deployed in the environment to provide services to those terminal devices accessing the cellular network within its coverage area 101. It should be understood that the terminal devices and the links between them are shown for illustrative purposes only. There may be various other terminal devices and network devices in various forms in V2X communications.

[0026] The network device 120 may divide different zones, such as the coverage 102 (also referred to as zone 102) shown in Figure 1, according to the relative position with respect to the terminal device 110 (or the absolute position of the terminal device 110). Some terminal devices (e.g., terminal devices 110-1, 110-2, and 110-4) may be located within the zone 102, and some terminal devices (e.g., terminal device 110-3) may be located outside the zone 102. Terminal devices located in different zones may also be able to communicate with each other.

[0027] The environment 100 illustrates a V2X communication scenario in which vehicles and any other devices (network devices 120) can communicate with each other. As described above, V2X communication can be divided into four types, including vehicle-to-vehicle (V2V), vehicle-to-pedestrian (V2P), vehicle-to-infrastructure (V2I), and vehicle-to-network (V2N). Communication between terminal devices 110 (i.e., V2V, V2P, and V2I communication) can be performed via both the Uu interface and a direct link (or sidelink), while communication involving network devices 120 (i.e., V2N communication) can be performed only via the Uu interface. In the case of sidelink-based V2X communication, information is transmitted from a TX terminal device to one or more RX terminal devices in a broadcast manner.

[0028] Depending on the communication technology, network 100 may be a Code Division Multiple Access (CDMA) network, a Time Division Multiple Access (TDMA) network, a Frequency Division Multiple Access (FDMA) network, an Orthogonal Frequency-Division Multiple Access (OFDMA) network, a Single Carrier-Frequency Division Multiple Access (SC-FDMA) network, or other network. Communications over network 100 may be compliant with any suitable standard, including, but not limited to, New Radio Access (NR), Long Term Evolution (LTE), LTE-Evolution, LTE-Advanced (LTE-A), Wideband Code Division Multiple Access (WCDMA), Code Division Multiple Access (CDMA), cdma2000, and Global System for Mobile Communications (GSM). Furthermore, communications may be performed according to any generation of communication protocols now known or developed in the future. Examples of communication protocols include, but are not limited to, first generation (1G), second generation (2G), 2.5G, 2.75G, third generation (3G), fourth generation (4G), 4.5G, and fifth generation (5G) communication protocols. The techniques described herein may be used for the above wireless networks and radio technologies as well as other wireless networks and radio technologies. For clarity, the technical aspects will be described below for LTE, and LTE terminology will be used much in the following description.

[0029] In V2X communication, the sidelink is used, for example, for ProSe direct communication between UEs. PSSCH and PSCCH are defined in 3GPP as two physical channels of the sidelink. The basic (smallest) resource unit in the time domain is a slot (or subframe). Meanwhile, a slot in the time domain may contain multiple symbols. The subframe may be flexibly multiplexed (or FDM) in the frequency domain using the PSSCH and PSCCH.

[0030] Currently, in LTE-V2X, PSCCH and PSSCH are frequency-division multiplexed (FDM) and mapped from the first symbol (i.e., the initial symbol) in a subframe. When such a subframe is received by a receiving UE, the first symbol can be used for AGC setting. Another possible solution is that PSCCH and PSSCH are time-division multiplexed (TDM) in NR-V2X. However, because the received power of different symbols in a slot may differ, AGC of the first symbol in the LTE sidelink may not be accurate. However, without accurate AGC, the signal received at the receiver will change, which will affect receiver performance. As a result, it is necessary to find a solution that provides a resource set configuration so that AGC can be performed accurately when PSCCH and PSSCH are time-division multiplexed.

[0031] FIG. 2 illustrates a schematic configuration of a subchannel 200 based on TDM for PSSCH and PSCCH in accordance with some embodiments of the present disclosure. As illustrated in FIG. 2, the subchannel 200 occupies a time-domain slot 204. The subchannel 200 includes multiple adjacent resource blocks 202 (RBs) in the same slot 204. In this example, the time slot 204 may include multiple symbols. In some embodiments, the symbols may be OFDM or SC-FDMA symbols. Of the 14 symbols, symbol 0, which is the initial symbol 206 shown in FIG. 2, may be used for AGC. That is, the AGC signal is carried in the initial symbol 206 for AGC configuration.

[0032] According to an embodiment of the present disclosure, the terminal device 110 may determine the resource set configuration as described above for V2X communication between a control channel and a data channel, for example, between a PSCCH and a PSSCH. The AGC signal is determined based on control information for the V2X communication. The V2X communication can be performed based on such configuration.

[0033] The subchannels may be configured with, for example, one or more sidelink control time-frequency resource sets (SCORESETs) 208 for the PSCCH per subchannel. In some other embodiments, one or more SCORESETs for the PSCCH may be configured per resource pool, per bandwidth, per bandwidth portion, etc., without being limited thereto. As the principle remains the same, this structure will not be repeated here.

[0034] In some embodiments, when one SCORESET 208 is configured or pre-configured, the bandwidth of the SCORESET 208 may always be equal to the resource pool, bandwidth, bandwidth portion, or subchannel. In some further embodiments, when multiple SCORESETs (not shown) are configured, the duration and initial symbols 206 of each SCORESET 208 are the same, and the bandwidths of different SCORESETs 208 do not overlap with each other.

[0035] One SCORESET 208 is always associated with one PSSCH time-frequency resource set in a slot, and multiple SCORESETs may be associated with a single PSSCH time-frequency resource set.

[0036] In this embodiment, as shown in Figure 2, subchannel 200 is configured with PSSCH resource sets 210 to which SCORESET 208, as described above, is associated. A termination symbol 212, which is the last symbol in subchannel 200, is configured to be part of PSSCH resource set 210. In some embodiments, termination symbol 212 is not limited to being part of PSSCH resource set 210 as shown in Figure 2, and may carry other types of information or be void.

[0037] In some other embodiments, one symbol of SCORESET may transmit both control information transmitted on the PSSCH and other data transmitted on the PSCCH (not shown).

[0038] Furthermore, in some embodiments, if only one supportable aggregation level is (pre-) configured in each SCORESET, the supportable aggregation levels of different SCORESETs are different, and if multiple aggregation levels are supported in each SCORESET, the UE may select the aggregation level according to instructions from the base station or the status of the sidelink channel.

[0039] In some embodiments, the transmit power of the PSSCH and the transmit power of the PSCCH may be configured in various ways.

[0040] In some embodiments, when a terminal device transmits data using a PSCCH and a PSSCH that are not on the same symbol, the terminal device may configure the transmit power of the PSCCH on one symbol to be proportional to the transmit power of the associated PSSCH on another symbol. Thus, the transmit power transmitted by the terminal device over a slot 204 does not vary beyond the range of the AGC, thereby providing accurate AGC. In one example, the transmit power of a PSCCH is always similar to the power of the associated PSSCH.

[0041] In some other embodiments, when a terminal device transmits data using PSCCH and PSSCH on the same symbol, the terminal device may be configured to ensure that the difference between the maximum and minimum transmit power across all symbols in time slot 204 is less than X dBm. Such a configuration is then transmitted by the terminal device. In one example, X is 0.01 dBm, but is not limited thereto. X may be any value depending on requirements and practical needs. The value of X may be pre-configured or specified.

[0042] Alternatively, when a terminal device transmits both the PSCCH and the PSSCH in a single symbol, the terminal device may be configured to ensure that the transmission power in the symbol in which the PSCCH is used for transmission is the same as the transmission power in the symbol in which the PSSCH is used for transmission. That is, the total transmission power in the symbol in which both the PSCCH and the PSSCH are used is, for example, the same as the transmission power of the symbol in which only the PSSCH is used. As a result, such a configuration is transmitted by the terminal device.

[0043] In one embodiment, the transmit power of the PSCCH may be higher than the transmit power of the PSSCH if it is present in the same symbol.

[0044] According to embodiments of the present disclosure, there are various ways to configure the AGC settings when TDM of PSSCH and PSCCH is used. Figures 3-5 respectively illustrate three different schemes for configuration. These schemes are described for illustrative purposes, and it should be understood that no limitation is implied. There may be other suitable ways to determine the configuration.

[0045] As a first scheme, Figures 3A and 3B separately illustrate the configuration of a SCORESET according to some embodiments of the present disclosure. The configuration may be determined by a terminal device, such as terminal device 110 shown in Figure 1. This is provided for illustrative purposes and should not be considered limiting. In some alternative embodiments, the configuration may be determined by a network device, such as network device 120 shown in Figure 1, or other suitable device or controller.

[0046] 3A and 3B, in the frequency domain, one physical resource block (PRB) 302 may include multiple subcarriers. The PRB 302 is the smallest resource unit in the frequency domain.

[0047] In some embodiments, as shown in Figure 3A, SCORESET 208 has three PRBs 302. In some embodiments, a PDCCH-like physical layer structure is used for the PSCCH, and SCORESET 208 includes multiple resource element groups (REGs) 304. In one example, a REG is equal to one resource block in one OFDM symbol. In some other embodiments, a PUSCH-like physical layer structure is used for the PSCCH. The physical layer structure used for the PSCCH can be other, based on requirements and application scenarios, but is not limited thereto.

[0048] In this embodiment, one PRB 302 has three resource element groups 304, for a total of 12 resource element groups 304. This example is used for illustrative purposes only. In actual implementations, the number of PRBs and REGs may vary depending on specific requirements and needs.

[0049] 3A also shows how the PSCCH is mapped to the SCORESET 208. As shown in FIG. 3A, the SCORESET 208 starts at the second symbol (symbol 1) in the slot, and the PSCCH is mapped within the SCORESET. In addition, the AGC signal transmitted in the first symbol is a replication of one symbol of the SCORESET. That is, the AGC signal is part of the control information transmitted in symbols in the SCORESET after the first symbol. In the particular example shown in FIG. 3A, the value of the AGC signal at symbol 0 is equal to the value of the control information transmitted at symbol 1. In the particular example shown in FIG. 3B, the value of the AGC signal at symbol 0 is equal to the value of the control information transmitted at symbol 2.

[0050] In some embodiments, a replication of a portion of the control information to be transmitted in symbols after the initial symbol is configured by the UE and configured as an AGC signal. The portion of the control information, i.e., the AGC signal, is then transmitted from the first terminal device to the second terminal device in the initial symbol based on the configuration. As a result, the second terminal device receives the configuration shown in FIG. 3A.

[0051] 4, the value of the transmitted AGC signal is a portion of the control information, which is different from the remainder of the control information transmitted in one or more symbols after the initial symbol, e.g., symbol 1 and symbol 2. Furthermore, this portion of the control information is transmitted in the initial symbols between the terminal devices, e.g., between terminal devices 110-1, 110-2, 110-3, ..., based on the configuration.

[0052] In some embodiments, this portion is determined by the terminal device and configured as an AGC signal, as described above.

[0053] In some embodiments, the configuration may be configured locally, as described above, or the configuration may be received from another terminal device or a network device that manages the first and second terminal devices.

[0054] In some embodiments, the transmit power on the initial symbols 206 is the same as the transmit power on the symbols of SCORESET 208 .

[0055] As a second scheme, FIG. 4 illustrates the construction of a SCORESET according to some embodiments of the present disclosure.

[0056] In some embodiments, the PSCCH uses a PDCCH-like physical layer structure, and the SCORESET 208 includes multiple REGs 304, as shown in Figure 4. In some other embodiments, the PSCCH uses a PUSCH-like physical layer structure, or the physical layer structure used for the PSCCH can be other, based on requirements and scenarios, but is not limited thereto.

[0057] Figure 4 also shows how the PSCCH is mapped into the SCORESET 208. As shown in Figure 4, the SCORESET 208 starts at the first symbol in the slot (symbol 0), and the PSCCH is mapped into the SCORESET.

[0058] In some embodiments, the transmit power of a PSCCH is the same as the transmit power of the associated PSSCH.

[0059] As a third scheme, FIG. 5 illustrates the construction of a SCORESET according to some embodiments of the present disclosure.

[0060] In this embodiment, as shown in Figure 5, the PSCCH uses a PDCCH-like physical layer structure, and the SCORESET 208 includes multiple REGs 304. In some other embodiments, the PSCCH uses a PUSCH-like physical layer structure. Alternatively, the physical layer structure used for the PSCCH can be other based on requirements and scenarios, but is not limited thereto.

[0061] FIG. 5 also shows a method for mapping the PSCCH to the SCORESET 208. As shown in FIG. 5, the SCORESET 208 starts from the second symbol (symbol 1) in the slot, and the PSCCH is mapped within the SCORESET. In addition, a reference signal sequence (RSS) 502 is transmitted in the first symbol, i.e., symbol 0, shown in FIG. 5. In this embodiment, the RSS 502 is used for channel estimation, including CSI measurement and path loss measurement, in unicast / groupcast of NR-V2X. The RSS 502 may be implemented as a wideband reference signal.

[0062] First, the sequence of RSS 502 may be a pseudo noise (PN) sequence, a Zadoff-Chu (ZC) sequence, or a computer generated sequence (CGS).

[0063] Second, the RSS 502 may be transmitted in a comb format, where the number of combs may be configured or pre-configured per resource pool, per bandwidth, per bandwidth portion, or per subchannel.

[0064] In some embodiments, RSS 502 may be transmitted with different cyclic shift values. The allowed cyclic shift values ​​may be configured or pre-configured per resource pool, per bandwidth, per bandwidth portion, or per subchannel. In some embodiments, an RSS 502 may be identified by the {comb offset, cyclic shift value} pair used by the RSS 502.

[0065] In some embodiments, the comb offset and cyclic shift of the RSS 502 used by the UE may be specified by the base station, or may be one-to-one associated with a PSCCH resource, or may be one-to-one associated with a PSSCH resource. The comb offset and cyclic shift of the RSS 502 may also be related to the transmission mode, which may be, but is not limited to, broadcast, groupcast, or unicast for the UE.

[0066] In one example, only one pair of allowed {comb offset, cyclic shift value} pairs is configured or pre-configured for broadcast per resource pool, per bandwidth, per bandwidth portion, or per subchannel.

[0067] In another example, the allowed {comb offset, cyclic shift} pairs corresponding to unicast and / or groupcast are different from those corresponding to broadcast. When the transmission mode is unicast or groupcast, at least one of the comb offset, cyclic shift, or scrambling ID for initializing the RSS 502 is derived from the unicast or groupcast destination ID and / or source ID. Thus, the receiver can distinguish which terminal device the received signal is from.

[0068] In some embodiments, the transmission mode may be indicated to the physical layer of the UE by a higher layer (eg, the media access control (MAC) layer or the application layer).

[0069] In some embodiments, the transmit power of the RSS 502 is proportional to the transmit power of the associated PSCCH or PSSCH, e.g., the transmit power of the RSS 502 is the same as the transmit power of the associated PSCCH or PSSCH.

[0070] In one embodiment, the three schemes shown in Figures 3-5 above can be configured for different resource pools, different bandwidths, different bandwidth portions, or different subchannels, respectively. When the second scheme shown in Figure 4 is configured for a resource pool, bandwidth, bandwidth portion, or subchannel, from the perspective of the receiving UE, the receiving UE is expected to decode the first symbol. Alternatively, the receiving UE is expected to decode the first symbol if it is configured or pre-configured to decode the first symbol in the resource pool, bandwidth, bandwidth portion, or subchannel; otherwise, the UE is not expected to decode the first symbol.

[0071] In all the above schemes, the UE transmits the PSCCH or RSS 502 from the beginning of the first symbol of the slot.

[0072] In some embodiments, for PSSCH, rate matching is applied only to resources used for transmission on the PSCCH and resources used for transmission of reference signals, and the UE is required to transmit the PSSCH in the last symbol of the slot.

[0073] In a Tx / Rx switching scenario, the transmission and reception operations of the terminal device are switched. From the perspective of the receiving terminal device, before reception, the terminal device performs transmission, and there is data at the end symbol of the multiple symbols for V2X communication being transmitted. In such a scenario, a stop position at the end symbol may be determined. In addition, it can be configured so that if the terminal device performs transmission in another slot immediately after the end symbol, the terminal device does not need to receive data transmitted from the stop position to the end of the end symbol.

[0074] In some embodiments, based on the determined configuration, the terminal device obtains a determined configuration such that data transmitted in the end symbol is received up to the stop position, i.e., if the UE attempts to transmit in another slot immediately after the end symbol, the terminal device will not be authorized to receive the entire end symbol 212 of the slot.

[0075] In some other embodiments, in a Tx / Rx switching scenario, from the perspective of the receiving terminal device, the terminal device transmits in another slot immediately before the initial symbol. In such a scenario, a starting position in the initial symbol may be determined. Furthermore, when the terminal device transmits in another slot immediately before the initial symbol, the terminal device may be configured not to need to receive the AGC signal transmitted from the beginning of the initial symbol to the starting position.

[0076] In some embodiments, based on the determined configuration, the terminal device may obtain the determined configuration such that it starts receiving the AGC signal from the start of the initial symbol, i.e., if the UE is transmitting in the previous slot, the terminal device is not authorized to receive the entire initial symbol of the slot.

[0077] In one embodiment, the UE is expected to receive only the last y μs of the initial symbol of the slot, e.g., a value of y is specified. In another example, the value of y may be the time required for the UE to set the AGC.

[0078] FIG. 6 is a schematic diagram illustrating frequency division multiplexing (FDM) of PSSCH and PSCCH according to some embodiments of the present disclosure.

[0079] As shown in Figure 6, some embodiments of the present disclosure provide FDM multiplexing of PSCCH in SCORESET 602 and PSSCH in PSSCH resource set 604. In addition, AGC and Tx / Rx switching on the sidelink are also provided.

[0080] A subchannel 600 includes multiple adjacent resource blocks 202 (RBs) within the same slot 204. The subchannel 600 may be configured with one or more SCORESETs 602 for the PSCCH, for example, per subchannel. Alternatively, one or more SCORESETs 602 for the PSCCH may be configured per resource pool, per bandwidth, per bandwidth portion, etc., but this is not limited thereto. The principle is the same, so the structure will not be repeated here.

[0081] In some embodiments, when one SCORESET 602 is configured or pre-configured, the bandwidth of the SCORESET 602 may always be equal to a resource pool, bandwidth, bandwidth portion, or subchannel. In some other embodiments, when multiple SCORESETs 602 (not shown) are configured, the duration and initial symbols 206 of each SCORESET 602 are the same, and the bandwidths of different SCORESETs 602 do not overlap with each other.

[0082] In some embodiments, one SCORESET 602 is always associated with one PSSCH time-frequency resource set within a slot, and multiple SCORESETs may be associated with a single PSSCH time-frequency resource set.

[0083] In some embodiments, when only one supportable aggregation level is (pre-) configured in each SCORESET602, the supportable aggregation levels of different SCORESET602 are different, and when multiple aggregation levels are supported for each SCORESET602, the UE may select an aggregation level according to base station instructions or sidelink channel status.

[0084] In some embodiments, the UE transmits the PSSCH in the last symbol of the slot.

[0085] To support Tx / Rx switching, from the perspective of a receiving UE, in some embodiments, the UE is not authorized to receive the entire end symbol 606 of a slot if the UE attempts to transmit in another slot immediately after the end symbol. For similar reasons, in some other embodiments, the UE is not authorized to receive the entire initial symbol 608 of a slot if the UE is transmitting in the previous slot. In one embodiment, the UE is expected to receive only the last y μs of the initial symbol 608 of a slot. For example, a value of y is specified. In another example, the value of y can be the time the UE needs for AGC setup.

[0086] 7 illustrates a flowchart of a method 700 for sidelink communication according to some embodiments of the present disclosure. The method 700 may be performed by the terminal device 110 illustrated in FIG.

[0087] 7, in block 710, a configuration of resource sets for TDM in V2X communication between a control channel and a data channel is determined. The resource sets correspond to a plurality of symbols in the time domain. The configuration specifies that an AGC signal is transmitted in an initial symbol of the plurality of symbols. The AGC signal is determined based on control information of V2X communication with a second terminal device.

[0088] In block 720, V2X communication based on the configuration is determined (V2X communication is performed based on the configuration).

[0089] In some embodiments, determining the configuration includes configuring a replication of a portion of the control information transmitted in symbols after the initial symbol as the AGC signal.

[0090] In some embodiments, determining the configuration includes configuring a portion of the control information as an AGC signal, the portion being different from the remainder of the control information transmitted in one or more symbols after the initial symbol.

[0091] In some embodiments, determining the configuration of the resource set includes receiving the configuration from the second terminal device or a network device that manages the first and second terminal devices.

[0092] In some embodiments, determining the configuration includes configuring data for V2X communication to be transmitted at a terminal symbol of the plurality of symbols, and in some further embodiments, determining the configuration further includes determining a stop position at the terminal symbol and configuring such that the terminal device does not need to receive data from the stop position to the end of the terminal symbol if the terminal device performs a transmission in another slot immediately after the stop symbol.

[0093] In some embodiments, determining the configuration includes determining a starting position in the initial symbol and configuring the terminal device so that if the terminal device transmits in another slot immediately before the initial symbol, the terminal device does not need to receive an AGC signal from the beginning of the initial symbol to the starting position.

[0094] In some embodiments, performing V2X communication includes transmitting, in response to a configuration that identifies the AGC signal as a replication of a portion of the control information to be transmitted in a symbol after the initial symbol based on the configuration, the replication as an AGC signal from the first terminal device to the second terminal device in the initial symbol.

[0095] In some embodiments, performing V2X communications includes transmitting a portion of the control information from the first terminal device to the second terminal device in an initial symbol in response to a configuration identifying the AGC signal as a portion of the control information that is distinct from a remainder of the control information transmitted in one or more symbols after the initial symbol.

[0096] In some embodiments, performing V2X communication includes receiving, at the first terminal device, from the second terminal device, an AGC signal in an initial symbol that is a replication of a portion of control information transmitted in symbols after the initial symbol, or receiving, at the first terminal device, from the second terminal device, an AGC signal in the initial symbol that is a portion of control information that is different from the remainder of the control information transmitted in one or more symbols after the initial symbol.

[0097] In some embodiments, performing the V2X communication includes, in response to the configuration identifying that the terminal device does not need to receive data for the V2X communication from a stop position of a stop symbol of the plurality of symbols until the end of the stop symbol, obtaining a stop position at the stop symbol from the configuration, and, in response to the first terminal device performing a transmission in another slot immediately after the stop symbol, receiving data transmitted at the stop symbol until the stop position.

[0098] In some embodiments, performing V2X communication includes, in response to the configuration identifying that the terminal device does not need to receive an AGC signal from the beginning of the initial symbol up to the starting position, obtaining a starting position in the initial symbol from the configuration, and in response to the first terminal device performing a transmission in another slot immediately prior to the initial symbol, starting to receive the AGC signal from the starting position in the initial symbol.

[0099] In some embodiments, determining the configuration includes configuring a first transmit power of the control information to be proportional to a second transmit power of the data when the terminal device does not transmit both the control information and the data associated with the control information in the same symbol.

[0100] In some embodiments, performing V2X communication includes transmitting the control information at a first transmit power and transmitting the data at a second transmit power proportional to the first transmit power in response to the first terminal device not transmitting both the control information and the data associated with the control information in the same symbol.

[0101] In some embodiments, determining the configuration includes configuring such that when the terminal device transmits both control information and data associated with the control information in the same symbol, the difference between the maximum and minimum transmit powers for the symbols is less than a threshold difference, or such that the transmit power of the symbols transmitting the control information is the same as the transmit power of the symbols transmitting only data.

[0102] In some embodiments, performing V2X communication includes the following steps:

[0103] In some embodiments, in response to the first terminal device transmitting both the control information and data associated with the control information in the same symbol, transmitting the control information and the data such that a difference between a maximum transmit power and a minimum transmit power in the plurality of symbols is less than a threshold difference, or transmitting the control information and the data such that a transmit power of a symbol transmitting the control information is the same as a transmit power of a symbol transmitting only data.

[0104] 8 is a simplified block diagram of a device 800 suitable for implementing embodiments of the present disclosure. Device 800 can be considered a further exemplary embodiment of terminal device 110 shown in FIG. 1. Thus, device 800 can be implemented in or as at least a portion of terminal device 110.

[0105] As shown, device 800 includes a processor 810, a memory 820 connected to the processor 810, a suitable transmitter (TX) and receiver (RX) 840 connected to the processor 810, and a communication interface connected to the TX / RX 840. The memory 820 stores at least a portion of a program 830. The TX / RX 840 is for bidirectional communication. The TX / RX 840 has at least one antenna to facilitate communication, although in practice there may be several access nodes referred to herein. The communication interface represents any interface required for communication with other network elements, such as an X2 interface for bidirectional communication between eNBs, an S1 interface for communication between a Mobility Management Entity (MME) / Serving Gateway (S-GW) and an eNB, an Un interface for communication between an eNB and a Relay Node (RN), or a Uu interface for communication between an eNB and a terminal device.

[0106] The program 830 is assumed to include program instructions that, when executed by an associated processor 810, cause the device 800 to operate according to embodiments of the present disclosure, as discussed herein with reference to Figures 2-7. Embodiments of the present disclosure may be implemented by computer software executable by the processor 810 of the device 800, by hardware, or by a combination of software and hardware. The processor 810 may be configured to implement various embodiments of the present disclosure. Furthermore, the combination of the processor 810 and the memory 820 may form a processing means 850 suitable for implementing various embodiments of the present disclosure.

[0107] Memory 820 may be of any type suitable for a local technology network and may be implemented using any suitable data storage technology, including, by way of non-limiting example, non-transitory computer-readable storage media, semiconductor-based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory, and removable memory. While only one memory 820 is shown in device 800, device 800 may have several physically separate memory modules. Processor 810 may be of any type suitable for a local technology network and may include, by way of non-limiting example, one or more of a general-purpose computer, a special-purpose computer, a microprocessor, a digital signal processor (DSP), and a processor based on a multi-core processor architecture. Device 800 may have multiple processors, such as application-specific integrated circuit chips time-slaved to a clock that synchronizes the main processor.

[0108] In general, various embodiments of the present disclosure may be implemented in hardware or special purpose circuits, software, logic, or any combination thereof. Some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software executed by a controller, microprocessor, or other computing device. Although various aspects of embodiments of the present disclosure are illustrated and described using block diagrams, flowcharts, or some other graphical representations, these blocks, apparatus, systems, techniques, or methods described herein may be implemented in, by way of non-limiting example, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing device, or combinations thereof.

[0109] The present disclosure further provides at least one computer program product tangibly stored on a non-transitory computer-readable storage medium. The computer program product includes computer-executable instructions that execute on a target real or virtual processor device, such as those included in program modules, to perform the processes or methods described above with reference to any of FIGS. 2-8. Generally, program modules include routines, programs, libraries, objects, classes, components, data structures, etc. that perform particular tasks or implement particular abstract data types. The functionality of the program modules may be combined or split between program modules as desired in various embodiments. The machine-executable instructions for the program modules may be executed in local or distributed devices. In a distributed device, the program modules may be located in both local and remote storage media.

[0110] The program code for carrying out the methods of the present disclosure can be coded in any combination of one or more programming languages. These program codes are provided to a processor or controller of a general-purpose computer, a special-purpose computer, or other programmable data processing apparatus, so that when the program code is executed by the processor or controller, the functions / acts specified in the flowcharts and / or block diagrams are realized. The program code can be executed entirely on the machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine, or entirely on a remote machine or server.

[0111] The above program code may be embodied on a machine-readable medium, which may be any tangible medium that contains or stores a program for use by or in connection with an instruction execution system, apparatus, or device. The machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. The machine-readable medium includes, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of machine-readable storage media include an electrical connection of one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0112] Furthermore, while operations are depicted in the figures in a particular order, this should not be understood as requiring such operations to be performed in the particular order or sequential order depicted, or that all of the depicted operations be performed, to achieve desirable results. In certain situations, multitasking and parallel processing may be advantageous. Similarly, while the above description includes some specific implementation details, these should not be construed as limitations on the scope of the disclosure, but rather as descriptions of features specific to particular embodiments. Certain features that are described in the context of separate embodiments can also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment can also be implemented in multiple embodiments separately or in any suitable subcombination.

[0113] Although the present disclosure has been described in language specific to structural features and / or methodological acts, it is to be understood that the present disclosure, as defined by the appended claims, is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.

Claims

1. A terminal device, means for determining a configuration of a resource set for sidelink communication; and means for performing the sidelink communication with another terminal device based on the configuration; the resource set corresponds to a plurality of symbols in the time domain, the plurality of symbols including an initial symbol on which an automatic gain control (AGC) signal is transmitted; Terminal device.

2. The terminal device of claim 1 , wherein a replica of a portion of the control information transmitted in a symbol immediately following the initial symbol is configured as an AGC signal.

3. 1. A method implemented in a terminal device, comprising: determining a configuration of a resource set for sidelink communication; performing the sidelink communication with another terminal device based on the configuration; the resource set corresponds to a plurality of symbols in the time domain, the plurality of symbols including an initial symbol on which an automatic gain control (AGC) signal is transmitted; method.

4. 4. The method of claim 3, wherein a replica of a portion of the control information transmitted in a symbol immediately following the initial symbol is configured as an AGC signal.

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