Communication device, communication method and integrated circuit

Abstract

A user equipment, a base station and a wireless communication method related to physical resource configuration for sidelink communication in NR are provided. The user equipment includes: a circuit for determining a transmission time interval (TTI) allocated in a carrier for sending and / or receiving a physical sidelink channel; and a transceiver for sending and / or receiving the physical sidelink channel based on the TTI in the carrier, wherein the duration of the TTI is less than the time slot duration.

Description

Technical Field

[0001] The present disclosure relates to the field of wireless communications, and in particular, to a user equipment (UE), a base station (gNB), and a wireless communication method related to physical resource configuration for sending or receiving a physical sidelink channel in a new radio access technology (NR). Background Art

[0002] In the Long Term Evolution (LTE) of the Third Generation Partnership Project (3GPP), a carrier (also referred to as a "cell") is a radio resource in the time and frequency domains. A carrier can be divided into multiple subcarriers in the frequency domain and can be divided into multiple frames in the time domain. A frame can be divided into ten subframes, and each subframe can be divided into two time slots. Each subframe consists of a given number of OFDM symbols (12 or 14 symbols) in the time domain. Each OFDM symbol consists of a plurality of modulation symbols sent on the corresponding subcarriers. The transmission and / or reception of data and control information can be performed in the time domain based on a transmission time interval (TTI), and the TTI duration can be one subframe or multiple subframes.

[0003] Vehicle-to-everything (V2X) based on LTE sidelink has been specified in Release 14 and Release 15 of the 3GPP specification. In LTE, the physical sidelink channel does not support shortened TTI, and the allocation of TTI is at the subframe level. In LTE, the sidelink control channel (PSCCH) and the associated sidelink data channel (PSSCH) are located in the same subframe, and they are frequency division multiplexed (FDM).

[0004] In LTE V2X, sensing is performed at the subframe level, which includes two aspects: (1) decoding the PSCCH and measuring the sidelink RSRP (Sidelink Reference Signal Received Power, S-RSRP) of the PSSCH in the sensing window to exclude inappropriate resource candidates in the selection window; (2) measuring the sidelink RSSI (Sidelink Received Signal Strength Indication, S-RSSI) to rank the resource candidates in the selection window. In LTE V2X, for example, the UE measures multiple S-RSSI values ​​of the PSSCH at a period of 100 milliseconds and averages these values ​​as the basis for ranking a specific resource candidate among multiple candidates in the resource candidate set.

[0005] Now, 3GPP will discuss the design of physical channels on V2X-based sidelinks in New Radio (NR). So far, the discussion on the physical resource configuration of the physical sidelink channels in NR is still in a very preliminary stage, and it is not clear how to allocate physical channel resources for the sidelink. Summary of the invention

[0006] A non-limiting and exemplary embodiment facilitates determining a physical resource configuration of a physical sidelink channel in NR to support flexible transmit or receive timing of a UE and improve system performance.

[0007] In a first general aspect of the present disclosure, a user equipment (UE) is provided, comprising: a circuit that determines a transmission time interval (TTI) in a carrier allocated for sending or receiving a physical sidelink channel; and a transceiver that sends or receives the physical sidelink channel based on the TTI in the carrier, wherein the duration of the TTI is less than the time slot duration.

[0008] In a second general aspect of the present disclosure, a wireless communication method for a user equipment is provided, comprising: determining a TTI in a carrier allocated for sending or receiving a physical sidelink channel, and sending or receiving the physical sidelink channel based on the TTI in the carrier, wherein the duration of the TTI is less than the time slot duration.

[0009] In a third general aspect of the present disclosure, a base station is provided, comprising: a circuit that generates a configuration signal indicating time domain resources in a carrier for sending or receiving a physical sidelink channel; and a transmitter that sends the configuration signal to a user equipment, wherein the user equipment determines a TTI in the carrier allocated for sending or receiving the physical sidelink channel based on the configuration signal, wherein the duration of the TTI is less than the time slot duration.

[0010] In a fourth general aspect of the present disclosure, a wireless communication method for a base station is provided, comprising: generating a configuration signal indicating time domain resources in a carrier for sending or receiving a physical sidelink channel; and sending the configuration signal to a user equipment, wherein the user equipment determines a TTI in the carrier allocated for sending or receiving the physical sidelink channel based on the configuration signal, wherein the duration of the TTI is less than the time slot duration.

[0011] In the fifth general aspect of the present disclosure, a communication device is provided, including: a circuit, which determines a time resource for sidelink communication within a time slot; a transmitter, which sends a physical sidelink shared channel PSSCH in the time resource within the time slot; wherein the number of symbols in the time resource is less than the number of symbols in the time slot.

[0012] In the sixth general aspect of the present disclosure, a communication method is provided, comprising: determining time resources for sidelink communication within a time slot; sending a physical sidelink shared channel PSSCH in the time resources within the time slot; wherein the number of symbols of the time resources is less than the number of symbols within the time slot.

[0013] In the seventh general aspect of the present disclosure, a communication device is provided, comprising: a circuit, which determines a time resource for sidelink communication within a time slot; a receiver, which receives a physical sidelink shared channel PSSCH in the time resource within the time slot; wherein the number of symbols of the time resource is less than the number of symbols within the time slot.

[0014] In the eighth general aspect of the present disclosure, a communication method is provided, comprising: determining time resources for sidelink communication within a time slot; receiving a physical sidelink shared channel PSSCH in the time resources within the time slot; wherein the number of symbols of the time resources is less than the number of symbols within the time slot.

[0015] In the ninth general aspect of the present disclosure, an integrated circuit is provided, comprising: a circuit, controlling: determining a time resource for sidelink communication within a time slot; sending a physical sidelink shared channel PSSCH in the time resource within the time slot; wherein the number of symbols of the time resource is less than the number of symbols within the time slot.

[0016] In the tenth general aspect of the present disclosure, an integrated circuit is provided, comprising: a circuit, controlling: determining a time resource for sidelink communication within a time slot; receiving a physical sidelink shared channel PSSCH in the time resource within the time slot; wherein the number of symbols of the time resource is less than the number of symbols within the time slot.

[0017] It should be noted that the general or specific embodiments may be implemented as a UE, a base station, a system, a method, an integrated circuit, a computer program, a storage medium, or any selective combination thereof.

[0018] Additional benefits and advantages of the disclosed embodiments will become apparent from the description and drawings. Benefits and / or advantages may be obtained individually from various embodiments and features of the description and drawings, and all of these embodiments and features need not be provided in order to obtain one or more of such benefits and / or advantages. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The foregoing and other features of the present disclosure will become more apparent from the following description and the appended claims, taken in conjunction with the accompanying drawings. It should be understood that these drawings depict only several embodiments according to the present disclosure and, therefore, should not be considered to limit the scope of the present disclosure, which will be described with additional specificity and detail through the use of the accompanying drawings, in which:

[0020] Figure 1 A block diagram showing a portion of a user equipment according to an embodiment of the present disclosure;

[0021] Figure 2 An exemplary scenario of sidelink communication in NR is shown;

[0022] Figure 3 Another exemplary scenario of sidelink communication in NR is shown;

[0023] Figure 4 An exemplary scenario of TTIs allocated for transmitting or receiving a physical sidelink channel according to an embodiment of the present disclosure is shown;

[0024] Figure 5 Another exemplary scenario of TTIs allocated for transmitting or receiving a physical sidelink channel according to an embodiment of the present disclosure is shown;

[0025] Figure 6 Another exemplary scenario of TTIs allocated for transmitting or receiving a physical sidelink channel according to an embodiment of the present disclosure is shown;

[0026] Figure 7 Another exemplary scenario of TTIs allocated for transmitting or receiving a physical sidelink channel according to an embodiment of the present disclosure is shown;

[0027] Figure 8 An exemplary scenario of signal sensing and resource selection operations for receiving and transmitting a physical sidelink channel according to an embodiment of the present disclosure is shown;

[0028] Fig. 9 Another exemplary scenario of signal sensing and resource selection operations for receiving and transmitting physical sidelink channels according to an embodiment of the present disclosure is shown;

[0029] Fig.10 A block diagram showing a portion of a base station according to an embodiment of the present disclosure is shown;

[0030] Fig.11 A block diagram showing details of a user equipment according to an embodiment of the present disclosure;

[0031] Fig.12 An example of a flow chart illustrating communication between two user devices according to an embodiment of the present disclosure is shown;

[0032] Fig.13 A flowchart of a wireless communication method for a user equipment according to an embodiment of the present disclosure is shown; and

[0033] Fig.14 A flow chart of a wireless communication method for a base station according to an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0034] In the following detailed description, reference is made to the accompanying drawings, which form a part of the present disclosure. In the drawings, similar symbols generally identify similar components, unless the context indicates otherwise. It is readily understood that various aspects of the present disclosure may be arranged, substituted, combined and designed in a variety of different configurations, all of which are expressly contemplated and form part of the present disclosure.

[0035] In NR, a frame can be divided into ten subframes, but unlike LTE, each subframe consists of a given number of slots (1, 2, 4, 8, 16). Each slot consists of a given number of OFDM symbols (12 or 14 symbols) in the time domain. Transmission and / or reception of data and control information is performed on a TTI basis in the time domain.

[0036] According to the present disclosure, the NR physical sidelink channel supports shortened TTI. In this case, the physical resource allocation is very flexible, for example, the TTI can start at any position in the time slot and have any duration. However, for the NR physical sidelink channel, supporting flexible transmission timing (e.g., starting position) and format (e.g., duration, DMRS pattern) of TTI is quite challenging for the receiver because there are too many possibilities for decoding PSCCH / PSSCH. Based on this consideration, the present disclosure also proposes the following features: the duration of the TTI transmitted and / or received by the sidelink is less than the time slot duration, and the starting position and / or duration of the TTI is configured, preconfigured or specified depending on different use cases. Different use cases include, but are not limited to, supporting a wider coverage area and supporting low latency.

[0037] The embodiments disclosed herein are applicable to vehicle-to-everything (V2X) communications, including but not limited to vehicle-to-infrastructure (V2I), vehicle-to-pedestrian (V2P), vehicle-to-vehicle (V2V), and any other communications using NR sidelinks.

[0038] In an embodiment of the present disclosure, there is provided Figure 1 The user equipment shown. Figure 1 FIG. 1 is a block diagram showing a portion of a user equipment (UE) according to an embodiment of the present disclosure. Figure 1 As shown, UE 100 may include circuit 110 and transceiver 120. Circuit 110 determines a TTI in a carrier allocated for sending and / or receiving a physical sidelink channel. Transceiver 120 sends and / or receives a physical sidelink channel based on the determined TTI in the carrier. According to the present disclosure, the duration of a TTI is less than the duration of a time slot.

[0039] According to an embodiment of the present disclosure, the term "TTI" and / or "time slot" refers to the resources allocated for sidelink transmission and / or reception in NR, which is not limited to the present disclosure and can be replaced by other terms such as "resources", "time resources", etc.

[0040] Figure 2 An exemplary scenario of sidelink communication in NR is shown. Figure 2 As shown, communication may be performed between two vehicles 201 and 202 via a side link as indicated by two thick arrows denoted as “SL”. Figure 1 The UE 100 shown in FIG. 1 may be used as a vehicle 201 , and another UE having the same functionality as the UE 100 may be used as a vehicle 202 , and vice versa.

[0041] For example, vehicle 201 may determine a TTI in a carrier that is allocated for sending or receiving a physical sidelink channel, and then vehicle 201 may send a sidelink signal to vehicle 202 in the TTI in the carrier. Here, the sidelink signal sent from UE 100 (e.g., vehicle 201) to another UE (e.g., vehicle 202) may be, for example, a control channel such as a physical sidelink control channel (PSCCH), a data channel such as a physical sidelink shared channel (PSSCH), a demodulation reference signal (DMRS), or a synchronization channel such as a physical sidelink broadcast channel (PSBCH) and / or a primary sidelink synchronization signal (PSSS). In addition, vehicle 201 may receive a sidelink signal from vehicle 202 based on the determined TTI.

[0042] Figure 3 Another exemplary scenario of sidelink communication in NR is shown. Figure 2 Similar, in Figure 3 , communication may be performed between two vehicles 201 and 202 via a side link as indicated by two thick arrows denoted as “SL”, and Figure 1 The UE 100 shown in FIG. 1 can be used as a vehicle 201, and another UE having the same function as the UE 100 can be used as a vehicle 202, and vice versa. To avoid redundancy, the details of the UE 100 and the vehicle 202 will not be described in detail. Figure 2 The same content as Figure 2 Different, in Figure 3In the NR, there is also a base station (BS, gNB) 310, and both vehicles 201 and 202 are within the coverage of BS 310. As shown by the corresponding arrows represented as "DL" or "UL", Uu communication can also be performed between BS 310 and each of the two vehicles 201 and 202. Here, "DL" indicates downlink, and "UP" indicates uplink. That is, sidelink communication and Uu communication can coexist in NR. Signaling transmitted via Uu can control the transmission of the sidelink. As Figure 1 The embodiments of the present disclosure shown can be applied to Figure 2 and Figure 3 Two scenarios are shown.

[0043] It may be specified in the NR standard specification that the duration of the TTI is less than the time slot duration of the physical sidelink channel. However, the present disclosure is not limited to this. The duration of the TTI may also be configured or pre-configured to be less than the time slot duration of the physical sidelink channel through signaling. For example, when the UE 100 is within the coverage of the base station, the UE 100 may receive a configuration signal from the base station, which configures the duration of the TTI to be less than the time slot duration of the physical sidelink channel, and the configuration signal may be DCI, MAC CE, or RRC signaling. Conversely, when the UE 100 is outside the coverage of any base station, the duration of the TTI may be pre-configured to be less than the time slot duration of the physical sidelink channel, for example, via signaling pre-set and / or stored in the UE 100.

[0044] for Figure 1 For the UE 100 shown in FIG, since the duration of TTI is shorter than the time slot duration of the physical sidelink channel, the flexibility of physical resource configuration is improved.

[0045] According to one embodiment of the present disclosure, the starting position and / or duration of the TTI in the time slot is configured, preconfigured or specified depending on different use cases, wherein the physical channel of the NR sidelink is classified into two modes, such as mode A and mode B. For example, mode A can be for large coverage, where a long TTI duration is supported, and / or both the front-loaded DMRS and the additional DMRS are always present. For example, mode B can be for low latency of the physical channel, where a short TTI duration is supported, and / or only the front-loaded DMRS is present. The duration of the sensing window and / or the resource selection window can be determined based on the duration of the long TTI or the short TTI or both.

[0046] Figure 4 An exemplary scenario of TTIs allocated for sending and / or receiving physical sidelink channels according to an embodiment of the present disclosure is shown. Figure 4In the figure, the horizontal axis represents time and the vertical axis represents frequency. In the time direction, two time slots such as "Time Slot 1" and "Time Slot 2" are shown, and each time slot can include 14 OFDM symbols. In the frequency direction, the frequency resource is composed of multiple subcarriers. The area formed by the intersection of each OFDM symbol and each subcarrier is called a resource element (not specifically shown in the figure), which is the smallest element of physical resources that can be allocated for sidelink communication. Figure 4 In the figure, the physical resources indicated by the right slash represent PSCCH, the physical resources indicated by the left slash represent PSSCH, and the physical resources indicated by the blank block represent DMRS.

[0047] like Figure 4 As shown, according to an embodiment of the present disclosure, the TTI allocated for transmitting and / or receiving the physical sidelink channel is configured to be less than the time slot duration. For example, the TTI in time slot 1 includes 13 OFDM symbols less than the total 14 OFDM symbols included in the time slot, and the TTI starts from the first symbol of time slot 1, and the last symbol of time slot 1 is reserved for guard period (GP) processing. Figure 4 In FIG. 1 , only the TTI included in the time slot 1 is shown as an example, and the case of the TTI included in the time slot 2 is not shown.

[0048] According to one embodiment of the present disclosure, a TTI including 13 symbols may be defined as a long TTI duration. However, the embodiments of the present disclosure are not limited to this case. The long TTI duration may also be defined as a plurality of OFDM symbols including a number of OFDM symbols equal to or greater than a threshold. The long TTI duration is for use cases supporting a wider coverage range and may also be referred to as TTI mode A or TTI mode 1.

[0049] According to one embodiment of the present disclosure, the threshold value may be equal to any one of 5, 6, 7, 8, 9, and 10. For example, when the threshold value is equal to 6, a TTI including 6 or more OFDM symbols is referred to as a long TTI duration. A specific threshold value for determining whether a TTI has a long duration or a short duration may be specified in the NR standard specification. However, the present disclosure is not limited thereto. According to another embodiment of the present disclosure, a specific threshold value may be configured or pre-configured by signaling. For example, the UE 100 may receive a configuration signal from a base station, which may notify the UE 100 of a specific threshold value for determining whether a TTI has a long duration or a short duration. The configuration signal may be a DCI, a MAC CE, or an RRC signaling.

[0050] According to one embodiment of the present disclosure, both the pre-DMRS signal and the additional DMRS signal are transmitted in the long TTI duration, wherein the pre-DMRS signal is transmitted on the second OFDM symbol of the long TTI duration, and the additional DMRS signal is transmitted on other OFDM symbols after the second OFDM symbol. Figure 4 As shown, DMRS 401 is a pre-DMRS signal transmitted on the second OFDM symbol. The first symbol of the time slot cannot be used to transmit a DMRS signal because the first symbol is used for potential AGC processing. In the long TTI duration, additional DMRS signals are also transmitted. Figure 4 As shown, DMRS 402 and DMRS 403 can be transmitted within the long TTI duration. The positions of transmitting DMRS 402 and DMRS 403 can be flexibly configured in the long TTI, for example, the position of transmitting the additional DMRS is on any other OFDM symbol after the second OFDM symbol. The position of transmitting DMRS can be configured or indicated in the downlink control information (DCI) received from the upper layer.

[0051] A TTI duration including fewer symbols may be defined as a short TTI duration. For example, a short TTI duration includes at least one OFDM symbol, but the number of OFDM symbols is less than a threshold. The short TTI duration is for use cases that support low latency and may also be referred to as TTI mode B or TTI mode 2.

[0052] According to one embodiment of the present disclosure, the threshold value is equal to any one of 5, 6, 7, 8, 9 and 10. For example, when the threshold value is equal to 6, a TTI duration including 5 or less OFDM symbols is referred to as a short TTI duration. A specific threshold value for determining whether a TTI has a long duration or a short duration may be specified in the NR standard specification. However, the present disclosure is not limited thereto. According to another embodiment of the present disclosure, a specific threshold value may be configured or pre-configured by signaling. For example, the UE 100 may receive a configuration signal from a base station, which may notify the UE 100 of a specific threshold value for determining whether a TTI has a long duration or a short duration. The configuration signal may be a DCI, a MAC CE or an RRC signaling.

[0053] Figure 5 Another exemplary scenario of TTIs allocated for sending and / or receiving physical sidelink channels according to an embodiment of the present disclosure is shown. Figure 5 In , the TTI duration includes 4 OFDM symbols, which is a short TTI duration.

[0054] According to an embodiment of the present disclosure, the pre-DMRS signal is transmitted only on the second OFDM symbol of the short TTI duration, and the additional DMRS signal is not transmitted. Figure 5 As shown, DMRS 501 is a pre-DMRS signal transmitted on the second OFDM symbol of the TTI. In a short TTI duration, no additional DMRS signal can be transmitted. The first symbol cannot be used to transmit a DMRS signal because the first symbol is used for potential AGC processing. In both mode A and mode B, the pre-DMRS is located in the second symbol of the TTI because the potential processing for AGC is at the first symbol.

[0055] Figure 6 Another exemplary scenario of TTIs allocated for sending and / or receiving physical sidelink channels according to an embodiment of the present disclosure is shown. Figure 6 In FIG. 1 , slot 1 includes 3 short TTIs. The duration of the first short TTI (TTI 1) includes 4 OFDM symbols, and it starts from the first symbol in slot 1. The duration of the second short TTI (TTI 2) includes 3 OFDM symbols, and it starts from the sixth symbol in slot 1. The duration of the third short TTI (TTI 3) includes 4 OFDM symbols, and it starts from the tenth symbol in slot 1. OFDM symbols located between two TTIs and the last OFDM symbol of slot 1 (indicated by GP1, GP2, and GP3, respectively) are reserved for guard period (GP) processing.

[0056] According to an embodiment of the present disclosure, a time slot includes at least one TTI, such as Figure 4 The TTI and Figure 6 The three TTIs shown. Each of the TTIs includes one or more OFDM symbols, where the first TTI duration starts from the first OFDM symbol of the time slot, and the OFDM symbol immediately following each of the TTI durations is reserved for guard period (GP) processing. The guard period is used to avoid the adverse effects of physical channel propagation delay. Since the GP can be set between each TTI, the starting position and / or duration of each TTI should be configured, preconfigured or specified depending on the presence of the GP.

[0057] According to another embodiment of the present disclosure, in case of DFT-S-OFDM, the TTI duration includes at least two OFDM symbols because the DMRS signal needs to be transmitted in one symbol.

[0058] According to the above-mentioned embodiment of the present disclosure, the additional DMRS signal is transmitted in the long TTI duration, but not in the short TTI duration. In the case of DFT-S-OFDM, since the DMRS signal needs to be transmitted in one OFDM symbol, the TTI must include at least two OFDM symbols, wherein the other OFDM symbol is used to transmit PSSCH and / or PSCCH. In this case, the starting position and / or duration of each TTI in the time slot should be configured, preconfigured or specified depending on the presence of DMRS and / or whether the additional DMRS is transmitted.

[0059] According to one embodiment of the present disclosure, within a TTI duration, the OFDM symbol occupied by the PSCCH is less than the OFDM symbol occupied by the PSSCH. For example, for each of the short TTIs in the time slot, the duration of the PSCCH is shorter than the duration of the PSSCH to reduce the processing time for the control channel. Figure 5 As shown, the TTI duration includes OFDM symbols 502, 503, 504, and 505. OFDM symbols 502 and 504 are occupied by PSCCH, and OFDM symbols 502, 504, and 505 are occupied by PSSCH, wherein the OFDM symbols occupied by PSCCH are less than the OFDM symbols occupied by PSSCH. According to another embodiment of the present disclosure, the feature that the OFDM symbols occupied by PSCCH are less than the OFDM symbols occupied by PSSCH is also applied to the long TTI in the time slot.

[0060] According to one embodiment of the present disclosure, PSCCH and PSSCH are frequency division multiplexed (FDM) within the same OFDM symbol in the carrier. Figure 5 As shown, in OFDM symbol 502, PSCCH occupies part of the frequency band, and PSSCH occupies another part of the frequency band, and they are frequency division multiplexed (FDM) in the same OFDM symbol 502. According to another embodiment of the present disclosure, the feature that PSCCH and PSSCH are frequency division multiplexed (FDM) in the same OFDM symbol in a carrier is applied to both long TTI and short TTI.

[0061] According to one embodiment of the present disclosure, OFDM symbols in different TTIs within a time slot are orthogonal in the time domain. Figure 7 FIG. 2 shows another exemplary scenario of TTIs allocated for sending and / or receiving physical sidelink channels according to an embodiment of the present disclosure. Figure 7In the embodiment, a time slot includes two TTIs, such as TTI 1 and TTI 2, where TTI 1 is a long TTI duration and TTI 2 is a short TTI duration. OFDM symbols located between two TTIs and the last OFDM symbol of the time slot (indicated by GP1 and GP2, respectively) are reserved for guard period (GP) processing. According to another embodiment of the present disclosure, the feature that OFDM symbols in different TTIs within a time slot are orthogonal in the time domain is applied to both long TTIs and short TTIs.

[0062] like Figure 7 As shown, in the long TTI duration "TTI 1", 8 OFDM symbols are included. In the short TTI duration "TTI 2", 4 OFDM symbols are included. According to one embodiment of the present disclosure, the OFDM symbols in the long TTI duration "TTI 1" and the OFDM symbols in the short TTI duration "TTI 2" are orthogonal in the time domain. The starting position and / or duration of each TTI should be configured, preconfigured or specified depending on whether the TTIs are orthogonal in the time domain.

[0063] According to one embodiment of the present disclosure, the duration of the resource selection window and / or the duration of the signal sensing window is determined according to the duration of the TTI. For TTI mode A and mode B, different resource selection windows are used for TTIs of long duration and TTIs of short duration. For transmissions of long duration, a longer selection window is used, and for transmissions of short duration, a shorter selection window is used. However, for both mode A and mode B, both TTIs of long duration and TTIs of short duration need to be sensed. The sensing windows of TTIs of long duration and TTIs of short duration may be the same or different in size. For example, a shorter sensing window is used for transmissions of TTIs of short duration compared to TTIs of long duration.

[0064] According to another exemplary embodiment of the present disclosure, for the transmission of a TTI of long duration, a TTI whose duration is greater than a threshold is sensed in the sensing window. That is, for the transmission of a TTI of long duration, only TTIs of long duration and TTIs whose duration is greater than a specific threshold need to be sensed. For example, for the transmission of a TTI with 13 symbols, it is not necessary to sense a TTI with 2 or 3 symbols, because the interference caused by 2 or 3 symbols can be ignored by the transmission of a TTI with 13 symbols.

[0065] When the NR sidelink supports only three TTI durations: 2 symbols, 7 symbols, and 14 symbols, the following Table 1 shows more examples.

[0066] Table 1

[0067]

[0068]

[0069] In Table 1 as shown above, whether to monitor the TTI duration in the sensing window is based on the TTI duration transmitted in the resource selection window. For example, if the TTI duration transmitted in the resource selection window is 2 symbols, all TTIs with 14 symbols, 7 symbols, and 2 symbols are monitored in the sensing window. If the TTI duration transmitted in the resource selection window is 7 or 14 symbols, TTIs with 2 symbols are ignored in the sensing window.

[0070] Figure 8 An exemplary scenario of signal sensing and resource selection operations for a physical sidelink channel according to an embodiment of the present disclosure is shown. Figure 8 , a sensing window 801 and a resource selection window 802 are shown. The sensing window 801 is from timing "na" to timing "n", and in the sensing window 801, it may be necessary to sense long TTIs and short TTIs, which is based on the TTI length of the resource candidates transmitted in the resource selection window 802, as described above. When a short TTI is included in the sensing window 801, the duration of the sensing window 801 may be shortened, or may remain unchanged without being shortened. After the sensing window 801, a resource selection operation will be triggered (803), and based on the sensing results from the sensing window 801, time and frequency resources for transmission are selected in the resource selection window 802. For example, if PSSCH 804 in a certain TTI is sensed as having strong interference in the sensing window 801, the UE will remove (805) the resource candidates for PSSCH 2 from the resource candidate set in the resource selection window 802, where the resource candidates for PSSCH 2 may be periodically affected by the sensed interference. As Figure 8 As shown, the duration of the resource selection window 802 is long because it is determined based on a TTI of long duration.

[0071] Fig. 9 Another exemplary scenario of signal sensing and resource selection operations for a physical sidelink channel according to an embodiment of the present disclosure is shown. Fig. 9, a sensing window 901 and a resource selection window 902 are shown. The sensing window 901 is from timing "na" to timing "n", and in the sensing window 901, it may be necessary to sense long TTIs and short TTIs, which is based on the TTI lengths of resource candidates transmitted in the resource selection window 902, as described above. When a short TTI is included in the sensing window 901, the duration of the sensing window 901 may be shortened, or may remain unchanged without being shortened. After the sensing window 901, a resource selection operation will be triggered (903), and based on the sensing results from the sensing window 901, time and frequency resources for transmission are selected in the resource selection window 902. In Fig. 9 In the example, since the TTI in the resource selection window 902 is a shortened TTI, the duration of the resource selection window 902 is shorter. In this case, the system delay can be reduced and the system performance can be improved.

[0072] In NR, sensing is operated at TTI level. In another exemplary scenario, ranking candidate resources in the selection window is based on the average S-RSSI measured in the sensing window in the same TTI duration as resource selection. Table 2 shows more examples.

[0073] Table 2

[0074]

[0075] In Table 2 shown above, the TTI duration used to measure the S-RSSI in the sensing window is the same as the TTI duration used to sort the resource candidates in the resource selection window. For example, if the TTI duration used to sort the resource candidates in the resource selection window is 7 symbols, the average S-RSSI should be measured in a TTI duration of 7 symbols.

[0076] In the above embodiments of the present disclosure, reference is made to Figure 1-Figure 9 The UE 100 and its operation are described in detail. For the UE 100 used as both a transmitter and a receiver, based on the above embodiments of the present disclosure, the UE 100 sends and / or receives a long TTI and / or a short TTI. For the receiver, the above operations greatly reduce the assumptions about the channel format, such as the duration, starting position and DMRS position of the TTI, so the complexity of the system is greatly reduced.

[0077] In another embodiment of the present disclosure, a base station is provided. Fig.10 FIG. 1 shows a block diagram of a portion of a base station according to an embodiment of the present disclosure. Fig.10As shown, the base station 1000 may include a circuit 1010 and a transmitter 1020. The circuit 1010 generates a configuration signal, which indicates a time domain resource in a carrier for sending and / or receiving a physical sidelink channel. The transmitter 1020 sends the configuration signal to a user equipment. The user equipment determines a TTI in a carrier allocated for sending and / or receiving a physical sidelink channel based on the configuration signal, wherein the duration of the TTI is less than the time slot duration.

[0078] For example, the base station 1000 may be Figure 3 The base station 310 shown in FIG. 1 and the user equipment may be as shown in FIG. Figure 1 The UE 100 shown in FIG. Figure 2 and Figure 3 As shown in the vehicle 201 or 202. As described above, when the UE 100 is within the coverage of the base station 1000, the UE 100 can receive a configuration signal from the base station 1000 and determine the TTI allocated in the carrier for sending and / or receiving the physical sidelink channel. The configuration signal can be DCI, MAC CE or RRC signaling.

[0079] For example, as referenced above Figure 3 As described above, the vehicle 201 may perform Uu communication with the base station 310 , and perform sidelink transmission and / or reception with the vehicle 202 .

[0080] Fig.11 A block diagram showing details of a user device according to an embodiment of the present disclosure. Fig.11 As shown, UE 1100 includes an encoder 1101, a modulator 1102, a resource mapper 1103, a resource multiplexer 1104, a first signal processor 1105, a transmitter 1106, an antenna 1107, a receiver 1108, a second signal processor 1109, a resource demultiplexer 1110, a resource demapper 1111, a demodulator 1112, a decoder 1113, and a control circuit 1114. According to another embodiment of the present disclosure, the transmitter 1106 and the receiver 1108 may be implemented as a transceiver 1115.

[0081] For example, the encoder 1101 performs encoding processing on the transmitted data, and the modulator 1102 performs modulation processing on the encoded transmitted data to generate data symbols and control symbols. The resource mapper 1103 maps the data symbols and control symbols to physical resources. For example, when the transmitted data belongs to the side link data to be sent to another UE, the resource mapper 1103 maps the data symbols and control symbols to the physical side link channel with a long TTI duration and / or a short TTI duration determined according to the above embodiment. The resource multiplexer 1104 multiplexes data symbols, control symbols and / or other information such as synchronization information. The first signal processor 1105 performs signal processing, such as up-conversion, on the multiplexed signal output from the resource multiplexer 1104. The transmitter 1106 sends the processed side link signal to another UE via the antenna 1107.

[0082] Here, the operations of the encoder 1101, the modulator 1102, the resource mapper 1103, and the resource multiplexer 1104 are controlled by the control circuit 1114. According to another embodiment of the present disclosure, the control circuit 1114 may control the following: Fig.11 The operation of all other units or modules or circuits shown. For example, the control circuit 1114 can determine the TTI allocated in the carrier for sending and / or receiving the physical sidelink channel. The resource mapper 1103 maps the sidelink data symbol and the sidelink control symbol to the determined TTI, and the transmitter 1106 sends the sidelink signal on the determined TTI in the carrier to another UE. According to an embodiment of the present disclosure, the duration of the determined TTI is less than the time slot duration.

[0083] In addition, the receiver 1108 can receive a sidelink signal from another UE via an antenna 1107. The second signal processor 1109 performs signal processing, such as down-conversion, on the sidelink signal received by the receiver 1108. The resource demultiplexer 1110 demultiplexes the processed sidelink signal into a sidelink control symbol and / or a sidelink data symbol. The resource demapper 1111 demaps the sidelink control symbol and / or the sidelink data symbol from a physical resource (such as a TTI allocated for sending and / or receiving a physical sidelink channel), wherein the duration of the TTI is less than the duration of the time slot. The demodulator 1112 performs a demodulation process on the sidelink control symbol and / or the sidelink data symbol, and the decoder 1113 performs a decoding process on the demodulated sidelink control symbol and / or the sidelink data symbol to obtain received data.

[0084] Notice, Fig.11 The user equipment 1100 shown can be used as Figure 1UE 100 shown. Specifically, the combination of transmitter 1106 and receiver 1108 may correspond to transceiver 120. Circuit 110 may include encoder 1101, modulator 1102, resource mapper 1103, resource multiplexer 1104, first signal processor 1105, second signal processor 1109, resource demultiplexer 1110, resource demapper 1111, demodulator 1112, decoder 1113 and control circuit 1114. Alternatively, depending on specific requirements, one or more of these units may also be separated from circuit 110.

[0085] Since based on the above embodiments of the present disclosure, UE 1100 will send and / or receive long TTI and / or short TTI, this greatly reduces the assumptions on the channel format, such as the duration, starting position and DMRS position of TTI, and thus the complexity of the system is greatly reduced.

[0086] Fig.12 1 shows a flow chart of communication between two UEs according to an embodiment of the present disclosure. For example, both UE 1210 and UE 1220 can be implemented as follows: Figure 1 The UE 100 shown or Fig.11 UE 1100 is shown.

[0087] For example, Fig.12 It can correspond to the case where UE 1210 and 1220 are not within the coverage of any base station, or the case where they are within the coverage of a base station, which is similar to Figure 2 or Figure 3 That is, UE 1210 and 1220 may correspond to Figure 2 or Figure 3 Vehicles 201 and 202 are shown.

[0088] like Fig.12 As shown, at step ST1201, UE 1210 determines a physical sidelink resource. For example, UE 1210 determines a TTI in a carrier allocated for sending and / or receiving a physical sidelink channel, wherein the duration of the TTI is less than the time slot duration.

[0089] At step ST1202, UE 1210 and UE 1220 may perform sidelink transmission and / or reception between each other based on the determined TTI.

[0090] In another embodiment of the present disclosure, there is provided a Fig.13 A wireless communication method for user equipment is shown. Fig.13 1 shows a flow chart of a wireless communication method for a user equipment according to an embodiment of the present disclosure. For example, the wireless communication method 1300 can be applied to Figure 1 and Fig.11 UE 100 / 1100 are shown respectively.

[0091] like Fig.13 As shown, the wireless communication method 1300 starts at step S1301. In step S1301, a TTI allocated in a carrier for transmitting and / or receiving a physical sidelink channel is determined. At step S1302, a sidelink transmission and / or reception is performed based on the determined TTI in the carrier. According to an embodiment of the present disclosure, the duration of the determined TTI is less than the time slot duration. After step S1302, the wireless communication method 1300 ends. For example, the UEs performing sidelink transmission and / or reception with each other may be as follows Figure 2 and 3 Vehicles 201 and 202 are shown.

[0092] Note that other technical features in the UE 100 described above or below may also be incorporated into the wireless communication method 1300, and are not described here again to avoid redundancy.

[0093] Utilizing the wireless communication method 1300, for UEs used as both transmitters and receivers, based on the above-mentioned embodiments of the present disclosure, they send and / or receive long TTI and / or short TTI, which greatly reduces the assumptions on the channel format, such as the duration, starting position and DMRS position of the TTI, thereby greatly reducing the complexity of the system.

[0094] In another embodiment of the present disclosure, there is provided a Fig.14 A wireless communication method for a base station is shown. Fig.14 1400 is a flowchart of a wireless communication method for a base station according to an embodiment of the present disclosure. For example, the wireless communication method 1400 can be applied to Fig.10 Base station 1000 is shown.

[0095] like Fig.14 As shown, the wireless communication method 1400 starts at step S1401. In step S1401, a configuration signal indicating time domain resources in a carrier for sending and / or receiving a physical sidelink channel is generated. At step S1402, the configuration signal is sent to a user equipment. According to one embodiment of the present disclosure, the user equipment determines a TTI in the carrier allocated for sending and / or receiving a physical sidelink channel based on the configuration signal, and the duration of the TTI is less than the time slot duration. After step S1402, the wireless communication method 1400 ends. For example, the user equipment may be as follows Figure 1 and Fig.11 UE100 / 1100 shown.

[0096] Utilizing the wireless communication method 1400, for UEs used as both transmitters and receivers, based on the above-mentioned embodiments of the present disclosure, they send and / or receive long TTI and / or short TTI, which greatly reduces the assumptions on the channel format, such as the duration, starting position and DMRS position of the TTI, thereby greatly reducing the complexity of the system.

[0097] Note that other technical features in the base station 1000 described above or below may also be incorporated into the wireless communication method 1400 and are not described here again to avoid redundancy.

[0098] The present disclosure can be realized by software, hardware or software in cooperation with hardware.Each function block used in the description of each of the above-mentioned embodiments can be realized by LSI as an integrated circuit, and each process described in each embodiment can be controlled by LSI.They can be formed as a chip separately, or a chip can be formed as part or all of the function blocks.They can include data input and output coupled thereto.Depending on the difference in integration, the LSI here can be referred to as IC, system LSI, super LSI or even LSI.However, the technology realizing integrated circuit is not limited to LSI, but can be realized by using a dedicated circuit or a general-purpose processor.In addition, a field programmable gate array (FPGA) that can be programmed after manufacturing LSI can be used, or a reconfigurable processor that can reconfigure the connection and setting of the circuit unit arranged inside LSI can be used.

[0099] Note that those skilled in the art, based on the description given in the specification and known technologies, intend to make various changes or modifications to the present disclosure without departing from the content and scope of the present disclosure, and these changes and applications fall within the scope of the protection required. In addition, the constituent elements of the above-mentioned embodiments can be arbitrarily combined without departing from the scope of the present disclosure.

[0100] Embodiments of the present disclosure may provide at least the following subjects.

[0101] 1. A user equipment, comprising: a circuit, which determines a transmission time interval (TTI) in a carrier allocated for sending or receiving a physical sidelink channel; and a transceiver, which sends or receives a physical sidelink channel based on the TTI in the carrier, wherein the duration of the TTI is less than the time slot duration.

[0102] 2. The user equipment according to 1, wherein the time slot duration includes at least one TTI, each of the TTIs includes one or more OFDM symbols, wherein the first TTI duration starts from the first OFDM symbol of the time slot, and the OFDM symbols immediately following each of the TTI durations are reserved for the gap.

[0103] 3. The user equipment according to any one of 1 to 2, wherein the long TTI duration includes a number of OFDM symbols equal to or greater than a threshold.

[0104] 4. A user equipment according to any one of 1 to 3, wherein both a pre-DMRS signal and an additional DMRS signal are transmitted in a long TTI duration, wherein the pre-DMRS signal is transmitted on the second OFDM symbol of the long TTI duration, and the additional DMRS signal is transmitted on other OFDM symbols after the second OFDM symbol.

[0105] 5. The user equipment according to any one of 1 to 4, wherein the short TTI duration includes at least one OFDM symbol whose number is less than a threshold.

[0106] 6. The user equipment according to any one of 1 to 5, wherein a pre-DMRS signal is transmitted only on the second OFDM symbol of a short TTI duration, and an additional DMRS signal is not transmitted.

[0107] 7. The user equipment according to any one of 1 to 6, wherein, in a TTI, the OFDM symbols occupied by the PSCCH are less than the OFDM symbols occupied by the PSSCH.

[0108] 8. The user equipment according to any one of 1 to 7, wherein the PSCCH and the PSSCH are frequency division multiplexed (FDM) within the same OFDM symbol in a carrier.

[0109] 9. The user equipment according to any one of 1 to 8, wherein a duration of the resource selection window and / or a duration of the sensing window is determined according to a duration of a TTI.

[0110] 10. The user equipment according to 9, wherein, for transmission of a TTI of a long duration, a TTI having a duration greater than a threshold is sensed in the sensing window.

[0111] 11. The user equipment according to 9, wherein a TTI duration used for measuring the S-RSSI in the sensing window is the same as a TTI duration used for ranking resource candidates in the resource selection window.

[0112] 12. The user equipment according to any one of 1 to 11, wherein OFDM symbols in different TTIs within a time slot are orthogonal in the time domain.

[0113] 13. The user equipment according to any one of 1 to 12, wherein, in case of DFT-S-OFDM, the TTI duration includes at least two OFDM symbols.

[0114] 14. The user equipment according to any one of 1 to 13, wherein the threshold is equal to one of 5, 6, 7, 8, 9, and 10.

[0115] 15. A wireless communication method for a user equipment, comprising: determining a transmission time interval (TTI) in a carrier allocated for sending or receiving a physical sidelink channel; and sending or receiving a physical sidelink channel based on the TTI in the carrier, wherein the duration of the TTI is less than the time slot duration.

[0116] 16. A wireless communication method according to 15, wherein the time slot duration includes at least one TTI, each of the TTIs includes one or more OFDM symbols, wherein the first TTI duration starts from the first OFDM symbol of the time slot, and the OFDM symbols immediately following each of the TTI durations are reserved for the gap.

[0117] 17. The wireless communication method according to any one of 15 to 16, wherein the long TTI duration includes a number of OFDM symbols equal to or greater than a threshold.

[0118] 18. The wireless communication method according to any one of 15 to 17 further includes: transmitting a pre-DMRS signal on a second OFDM symbol of a long TTI duration, and transmitting an additional DMRS signal on other OFDM symbols after the second OFDM symbol.

[0119] 19. The wireless communication method according to any one of 15 to 18, wherein the short TTI duration includes at least one OFDM symbol whose number is less than a threshold.

[0120] 20. The wireless communication method according to any one of 15 to 19, further comprising: transmitting a pre-DMRS signal only on the second OFDM symbol of a short TTI duration without transmitting an additional DMRS signal.

[0121] 21. The wireless communication method according to any one of 15 to 20, wherein, in a TTI, the OFDM symbols occupied by the PSCCH are less than the OFDM symbols occupied by the PSSCH.

[0122] 22. The wireless communication method according to any one of 15 to 21, wherein the PSCCH and the PSSCH are frequency division multiplexed (FDM) within the same OFDM symbol in a carrier.

[0123] 23. The wireless communication method according to any one of 15 to 22 further includes: determining a duration of a resource selection window and / or a duration of a sensing window according to a duration of a TTI.

[0124] 24. The wireless communication method according to 23, wherein, for transmission of a TTI of a long duration, a TTI having a duration greater than a threshold is sensed in the sensing window.

[0125] 25. The wireless communication method according to 23, wherein a TTI duration used for measuring the S-RSSI in the sensing window is the same as a TTI duration used for sorting resource candidates in the resource selection window.

[0126] 26. The wireless communication method according to any one of 15 to 25, wherein OFDM symbols in different TTIs within a time slot are orthogonal in the time domain.

[0127] 27. The wireless communication method according to any one of 15 to 26, wherein, in the case of DFT-S-OFDM, the TTI duration includes at least two OFDM symbols.

[0128] 28. The wireless communication method according to any one of 15 to 27, wherein the threshold is equal to one of 5, 6, 7, 8, 9, and 10.

[0129] 29. A base station, comprising: a circuit, which generates a configuration signal, which indicates the time domain resources in a carrier for sending or receiving a physical sidelink channel; a transmitter, which sends the configuration signal to a user equipment, wherein the user equipment determines the transmission time interval (TTI) in the carrier allocated for sending or receiving the physical sidelink channel based on the configuration signal, wherein the duration of the TTI is less than the time slot duration.

[0130] 30. A base station according to 29, wherein the time slot duration includes at least one TTI, each of the TTIs includes one or more OFDM symbols, wherein the first TTI duration starts from the first OFDM symbol of the time slot, and the OFDM symbols immediately following each of the TTI durations are reserved for the gap.

[0131] 31. The base station according to any one of 29 to 30, wherein the long TTI duration includes a number of OFDM symbols equal to or greater than a threshold.

[0132] 32. A base station according to any one of 29 to 31, wherein both a preamble DMRS signal and an additional DMRS signal are transmitted within a long TTI duration, wherein the preamble DMRS signal is transmitted on the second OFDM symbol of the long TTI duration, and the additional DMRS signal is transmitted on other OFDM symbols after the second OFDM symbol.

[0133] 33. The base station according to any one of 29 to 32, wherein the short TTI duration includes at least one OFDM symbol whose number is less than a threshold.

[0134] 34. The base station according to any one of 29 to 33, wherein the pre-DMRS signal is transmitted only on the second OFDM symbol of the short TTI duration, and the additional DMRS signal is not transmitted.

[0135] 35. The base station according to any one of 29 to 34, wherein, in a TTI, the OFDM symbols occupied by the PSCCH are less than the OFDM symbols occupied by the PSSCH.

[0136] 36. A base station according to any one of 29 to 35, wherein PSCCH and PSSCH are frequency division multiplexed (FDM) within the same OFDM symbol in a carrier.

[0137] 37. The base station according to any one of 29 to 36, wherein a duration of the resource selection window and / or a duration of the sensing window is determined according to a duration of a TTI.

[0138] 38. The base station according to 37, wherein, for transmission of a TTI of a long duration, TTIs having a duration greater than a threshold are sensed in the sensing window.

[0139] 39. The base station according to 37, wherein a TTI duration used for measuring the S-RSSI in the sensing window is the same as a TTI duration used for sorting resource candidates in the resource selection window.

[0140] 40. The base station according to any one of 29 to 39, wherein OFDM symbols in different TTIs within a time slot are orthogonal in the time domain.

[0141] 41. The base station according to any one of 29 to 40, wherein, in case of DFT-S-OFDM, the TTI duration includes at least two OFDM symbols.

[0142] 42. The base station according to any one of 29 to 41, wherein the threshold is equal to one of 5, 6, 7, 8, 9, and 10.

[0143] 43. A wireless communication method for a base station, comprising: generating a configuration signal, which indicates the time domain resources in a carrier for sending or receiving a physical sidelink channel; sending the configuration signal to a user equipment, wherein the user equipment determines the transmission time interval (TTI) in the carrier allocated for sending or receiving the physical sidelink channel based on the configuration signal, wherein the duration of the TTI is less than the time slot duration.

[0144] 44. A wireless communication method according to 43, wherein the time slot duration includes at least one TTI, each of the TTIs includes one or more OFDM symbols, wherein the first TTI duration starts from the first OFDM symbol of the time slot, and the OFDM symbols immediately following each of the TTI durations are reserved for the gap.

[0145] 45. A wireless communication method according to any one of 43 to 44, wherein the long TTI duration includes a number of OFDM symbols equal to or greater than a threshold.

[0146] 46. ​​The wireless communication method according to any one of 43 to 45 further includes: transmitting a pre-DMRS signal on a second OFDM symbol of a long TTI duration, and transmitting an additional DMRS signal on other OFDM symbols after the second OFDM symbol.

[0147] 47. A wireless communication method according to any one of 43 to 46, wherein the short TTI duration includes at least one OFDM symbol whose number is less than a threshold.

[0148] 48. The wireless communication method according to any one of 43 to 47 further includes: transmitting a pre-DMRS signal only on the second OFDM symbol of a short TTI duration without transmitting an additional DMRS signal.

[0149] 49. A wireless communication method according to any one of 43 to 48, wherein, in a TTI, the OFDM symbols occupied by the PSCCH are less than the OFDM symbols occupied by the PSSCH.

[0150] 50. The wireless communication method according to any one of 43 to 49, wherein PSCCH and PSSCH are frequency division multiplexed (FDM) within the same OFDM symbol in a carrier.

[0151] 51. The wireless communication method according to any one of 43 to 50 further includes: determining the duration of the resource selection window and / or the duration of the sensing window according to the duration of the TTI.

[0152] 52. The wireless communication method according to 51, wherein, for transmission of a TTI of a long duration, a TTI having a duration greater than a threshold is sensed in a sensing window.

[0153] 53. The wireless communication method according to 51, wherein a TTI duration used for measuring the S-RSSI in the sensing window is the same as a TTI duration used for sorting resource candidates in the resource selection window.

[0154] 54. A wireless communication method according to any one of 43 to 53, wherein OFDM symbols in different TTIs within a time slot are orthogonal in the time domain.

[0155] 55. A wireless communication method according to any one of 43 to 54, wherein, in the case of DFT-S-OFDM, the TTI duration includes at least two OFDM symbols.

[0156] 56. A wireless communication method according to any one of 43 to 55, wherein the threshold is equal to one of 5, 6, 7, 8, 9, and 10.

Claims

1. A communication device, comprising: circuitry for determining time resources within a time slot in a carrier for transmitting sidelink communications performed by the communication device, the time resources being allocated for sidelink transmission and / or reception; A transmitter, transmitting a physical sidelink shared channel PSSCH in the time resource in the carrier; The number of symbols of the time resource is less than the number of symbols in the time slot of the carrier, The number of symbols of the time resource is greater than the number of symbols of the time resource used to send the physical sidelink control channel PSCCH performed by the communication device, a first part of a frequency band is used for the PSCCH, a second part of the frequency band different from the first part of the frequency band is used for the PSSCH, The first portion of the frequency band is used for the PSSCH after time resources used for transmitting the PSCCH.

2. The communication device according to claim 1, wherein: The symbol next to the last symbol of the time resource is a guard period. The communication device according to claim 1 , wherein the number of symbols of the time resource is more than one symbol.

4. The communication device according to claim 1, wherein: The PSSCH and PSCCH are allocated in a frequency division multiplexing (FDM) manner within the same OFDM symbol in the carrier.

5. The communication device according to claim 1, wherein: Regardless of the long TTI duration or the short TTI duration, no demodulation reference signal DMRS is configured for the first symbol in the carrier.

6. The communication device according to claim 1, wherein: At short TTI duration, fewer symbols are used for the demodulation reference signal DMRS.

7. The communication device according to claim 1 or 6, wherein: In short TTI duration, the second symbol of the time slot is used for the demodulation reference signal DMRS.

8. The communication device according to claim 1, wherein the number of symbols of the time resource is selected from a plurality of numbers of symbols.

9. A communication method, comprising: determining a time resource within a time slot in a carrier for transmitting a sidelink communication to be performed, the time resource being allocated for sidelink transmission and / or reception; Sending a physical sidelink shared channel (PSSCH) in the time resource in the carrier; The number of symbols of the time resource is less than the number of symbols in the time slot of the carrier, The number of symbols of the time resource is greater than the number of symbols of the time resource used for sending the physical sidelink control channel PSCCH being performed, a first part of a frequency band is used for the PSCCH, a second part of the frequency band different from the first part of the frequency band is used for the PSSCH, The first portion of the frequency band is used for the PSSCH after time resources used for transmitting the PSCCH.

10. A communication device, comprising: circuitry for determining time resources within a time slot in a carrier for transmitting sidelink communications performed by the communication device, the time resources being allocated for sidelink transmission and / or reception; A receiver, receiving a physical sidelink shared channel PSSCH in the time resource in the carrier; The number of symbols of the time resource is less than the number of symbols in the time slot of the carrier, The number of symbols of the time resource is greater than the number of symbols of the time resource used to send the physical sidelink control channel PSCCH performed by the communication device, a first part of a frequency band is used for the PSCCH, a second part of the frequency band different from the first part of the frequency band is used for the PSSCH, The first portion of the frequency band is used for the PSSCH after time resources used for transmitting the PSCCH.

11. A communication method, comprising: determining a time resource within a time slot in a carrier for transmitting a sidelink communication to be performed, the time resource being allocated for sidelink transmission and / or reception; Receiving a physical sidelink shared channel (PSSCH) in the time resource in the carrier; The number of symbols of the time resource is less than the number of symbols in the time slot in the carrier, The number of symbols of the time resource is greater than the number of symbols of the time resource used for sending the physical sidelink control channel PSCCH being performed, a first part of a frequency band is used for the PSCCH, a second part of the frequency band different from the first part of the frequency band is used for the PSSCH, The first portion of the frequency band is used for the PSSCH after time resources used for transmitting the PSCCH.

12. An integrated circuit comprising: Circuit, control: determining a time resource within a time slot in a carrier for transmitting a sidelink communication to be performed, the time resource being allocated for sidelink transmission and / or reception; Sending a physical sidelink shared channel (PSSCH) in the time resource in the carrier; The number of symbols of the time resource is less than the number of symbols in the time slot of the carrier, The number of symbols of the time resource is greater than the number of symbols of the time resource used for sending the physical sidelink control channel PSCCH being performed, a first part of a frequency band is used for the PSCCH, a second part of the frequency band different from the first part of the frequency band is used for the PSSCH, The first portion of the frequency band is used for the PSSCH after time resources used for transmitting the PSCCH.

13. An integrated circuit comprising: Circuit, control: determining a time resource within a time slot in a carrier for issuing a sidelink communication to be performed, the time resource being allocated for sidelink transmission and / or reception; Receiving a physical sidelink shared channel (PSSCH) in the time resource in the carrier; The number of symbols of the time resource is less than the number of symbols in the time slot of the carrier, The number of symbols of the time resource is greater than the number of symbols of the time resource used for sending the physical sidelink control channel PSCCH being performed, a first part of a frequency band is used for the PSCCH, a second part of the frequency band different from the first part of the frequency band is used for the PSSCH, The first portion of the frequency band is used for the PSSCH after time resources used for transmitting the PSCCH.

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