System and wireless communication method

Abstract

To facilitate determination of a resource for side link operation in order to reduce the complexity of receiver design and improve system performance.SOLUTION: In a system comprising a base station and user equipment in which a first bandwidth part (BWP) is assigned to a side link communication in a carrier, and a second BWP is assigned to communication between the base station and the user equipment in the carrier, the base station has a transmission and reception unit that performs communication with the user equipment in the second BWP, the user equipment has a transmission and reception unit that performs side link communication in the first BWP and performs communication with the base station in the second BWP, and the second BWP is a BWP that can be dynamically switched in the plurality of second BWPs and the first BWP is a BWP that cannot be dynamically switched.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present disclosure relates to the field of wireless communication, and more particularly, to user equipment (UE), base stations (gNB), and wireless communication methods related to sidelink communication, sidelink discovery, or resource configuration for any other sidelink operation in NR (New Radio Access Technology).

Background Art

[0002] In LTE (Long Term Evolution) V2X (Vehicle to anything), in order to realize (pre) - configuration of resources for sidelink communication, that is, to indicate the operation time / frequency position of sidelink transmission / reception, the concept of a resource pool is adopted. The resource pool configuration is indicated quasi - statically by radio resource control (RRC) signaling and includes both time information and frequency information in a carrier. One resource pool is selected for transmission based on the zone position of the UE (vehicle) in the carrier (the relationship between the zone and the resource pool is (pre) - configured).

[0003] In NR, in order to realize resource configuration mainly for power saving, the concept of a bandwidth part (BWP) is adopted. The BWP is a new concept specified in NR, which consists of one or more consecutive physical resource blocks (PRBs) in the frequency domain of a carrier. Therefore, the BWP may be regarded as a subdivision of the carrier. For example, the UE can operate in a wide BWP when there is traffic and in a narrow BWP when there is no or little traffic. In NR, up to four BWPs may be configured in a carrier, and only one BWP is active in one direction (downlink (DL) or uplink (UL)) at a time. Dynamic BWP switching via downlink control information (DCI) is also currently supported in NR.

[0004] So far, the discussion of sidelink in NR is still at a very early stage, and it is unclear how to configure resources for sidelink communication, sidelink discovery, or any other sidelink operations in NR. SUMMARY OF THE INVENTION

[0005] A non-limiting and exemplary embodiment facilitates determining resources for sidelink communication, sidelink discovery, or any other sidelink operations in NR in order to reduce the complexity of receiver design and improve system performance.

[0006] In a first general aspect of the present disclosure, there is provided a user equipment comprising a circuit operative to determine a bandwidth part (BWP) allocated for sidelink transmission and reception in a carrier, and a transceiver operative to perform the sidelink transmission and reception on the determined BWP in the carrier, wherein dynamic BWP switching is not supported for the sidelink transmission and reception in the carrier.

[0007] In a second general aspect of the present disclosure, there is provided a wireless communication method for a user equipment, comprising determining a bandwidth part (BWP) allocated for sidelink transmission and reception in a carrier, and performing the sidelink transmission and reception on the determined BWP in the carrier, wherein dynamic BWP switching is not supported for the sidelink transmission and reception in the carrier.

[0008] In a third general aspect of the present disclosure, a circuit is provided that operates to generate bandwidth part (BWP) configuration signaling including a bitmap indicating time domain resources for sidelink transmission and reception, and a transmitter that operates to transmit the BWP configuration signaling to a user equipment, wherein the BWP allocated for the sidelink transmission and reception in a carrier is determined by the user equipment based on the BWP configuration signaling, and dynamic BWP switching is not supported for the sidelink transmission and reception in the carrier.

[0009] In a fourth general aspect of the present disclosure, there is provided a radio communication method for a base station, including generating BWP configuration signaling including a bitmap indicating time domain resources for sidelink transmission and reception, and transmitting the BWP configuration signaling to a user equipment, wherein the BWP allocated for the sidelink transmission and reception in a carrier is determined by the user equipment based on the BWP configuration signaling, and dynamic BWP switching is not supported for the sidelink transmission and reception in the carrier.

[0010] Note that a general embodiment or a specific embodiment can be realized as a system, a method, an integrated circuit, a computer program, a storage medium, or any optional combination thereof.

[0011] Further benefits and advantages of the disclosed embodiments will become apparent from the specification and drawings. These benefits and / or advantages can be obtained individually by various embodiments and features of the specification and drawings. However, it is not necessary to provide all of these features in order to obtain one or more of such benefits and / or advantages.

Brief Description of the Drawings

[0012] The foregoing features and other features of the present disclosure will become more fully apparent from the following description and the appended claims, read in conjunction with the accompanying drawings. It is to be understood that these drawings illustrate only some embodiments in accordance with the present disclosure and are therefore not to be considered limiting of its scope, and that the present disclosure will be described in more specific and detailed manner by using the accompanying drawings.

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DETAILED DESCRIPTION OF THE INVENTION

[0013] In the following detailed description, reference is made to the accompanying drawings which form a part hereof. In the drawings, like reference numerals generally identify like components unless the context indicates otherwise. Aspects of the present disclosure can be configured, arranged, substituted, combined, and designed in a variety of ways, all of which are explicitly contemplated and will be readily understood to form part of the present disclosure.

[0014] In one embodiment of the present disclosure, a user equipment as shown in FIG. 1 is provided. FIG. 1 shows a partial block diagram of a user equipment 100 according to an embodiment of the present disclosure. As shown in FIG. 1, the UE 100 can include a circuit 110 and a transceiver 120. The circuit 110 operates to determine a bandwidth part (BWP) allocated for sidelink transmission and reception in a carrier. The transceiver 120 operates to perform sidelink transmission and reception on the determined BWP in a carrier. Dynamic BWP switching is not supported for sidelink transmission and reception in a carrier.

[0015] As described above, mainly for power saving purposes, the BWP concept is adopted in NR, and dynamic BWP switching is currently supported in NR. However, for sidelink operation, there is no motivation for dynamic BWP switching. For example, firstly, the vehicle is not limited by battery power. Secondly, dynamic BWP switching complicates the receiver design. This is because the UE may need to monitor multiple BWPs simultaneously in a carrier that is not consistent with the existing NR framework. Therefore, in the present disclosure, dynamic BWP switching is not supported for sidelink transmission and reception in a carrier.

[0016] For example, for clarity, FIG. 2 schematically shows an exemplary scenario of sidelink transmission and reception in NR. As shown in FIG. 2, communication can be performed between two vehicles 201 and 202 via a sidelink indicated by two thick arrows labeled "SL". The UE 100 shown in FIG. 1 may be vehicle 201, another user equipment communicating with UE 100 may be vehicle 202, or vice versa.

[0017] For example, vehicle 201 can determine a BWP allocated for sidelink transmission and reception in a carrier, and then transmit a sidelink signal to vehicle 202 on this BWP in the carrier. Here, the sidelink signal transmitted from UE 100 (e.g., vehicle 201) to another UE (e.g., vehicle 202) can 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), or a synchronization channel such as a Physical Sidelink Broadcast Channel (PSBCH) / Primary Sidelink Synchronization Signal (PSSS). Also, vehicle 201 can receive a sidelink signal from vehicle 202 on this BWP.

[0018] Unlike the current standards in NR, in the present disclosure, dynamic BWP switching is not supported for sidelink transmission and reception in a carrier. Since dynamic BWP switching is not supported for sidelink transmission and reception, it is not necessary to complicate the receiver design.

[0019] In addition, the exemplary scenario described with reference to FIGS. 1 - 2 can correspond to the case of an unlicensed carrier without signaling between a user equipment and a base station in a carrier. For example, the carrier is an unlicensed carrier for ITS. In this case, one BWP may be equivalent to one carrier. Further details for the case of an unlicensed carrier will be described later.

[0020] It may be specified in this standard that dynamic BWP switching is not supported for sidelink transmission and reception. However, the present disclosure is not limited thereto. Also, it may be set or pre-set by signaling that dynamic BWP switching is not supported for sidelink transmission and reception. For example, when the UE 100 is within the coverage of the BS, the UE 100 can receive signaling from the BS that sets that dynamic BWP switching is not supported for sidelink transmission and reception. On the other hand, when the UE 100 is outside the coverage of any BS, for example, at the time of designing the UE 100, it is possible to pre-set by signaling that is pre-set and stored in the UE 100 by the operator in advance that dynamic BWP switching is not supported for sidelink transmission and reception.

[0021] According to the user equipment 100 shown in FIG. 1, since dynamic BWP switching is not supported for sidelink transmission and reception, the complexity of the receiver design can be reduced and the system performance can be improved.

[0022] As described above, the discussion of sidelink in NR is still at a very early stage, and it is unclear how to configure resources for sidelink communication, sidelink discovery, or any other sidelink operations in NR. For example, one of the issues to be considered is how the signal interaction with the base station (Uu), sidelink transmission and reception, can coexist in the uplink carrier in NR. For example, when sidelink transmission and reception coexist with Uu communication within the same BWP, it seems difficult to apply dynamic BWP switching to Uu. The reason is that dynamic BWP switching complicates the sidelink receiver that needs to monitor multiple BWPs to receive sidelink messages in the carrier, and dynamic BWP switching affects the sidelink detection performance due to interference fluctuations. This also applies to sidelink operations for ITS carriers. However, dynamic BWP switching for Uu (e.g., for enhanced mobile broadband (eMBB) or ultra-reliable and low-latency communication (URLLC)) may not affect Uu performance in terms of power saving, load balancing, etc.

[0023] Note that the ITS carrier is something like the 5.9 GHz spectrum regulated for the advanced road traffic system, while the Uu carrier is a licensed carrier operating in a specific band managed by the operator. Since the concepts of ITS carrier and Uu carrier are well-known to those skilled in the art, they will not be described in detail to avoid confusing the inventive concept of the present disclosure.

[0024] In view of the above, according to an embodiment of the present disclosure, in the UE100 shown in FIG. 1, the above BWP is used only for sidelink transmission and reception, and another BWP is allocated for the transmission between this user equipment and the base station in the carrier.

[0025] For example, for ease of understanding, FIG. 3 schematically shows another exemplary scenario of sidelink transmission and reception in NR. Similar to FIG. 2, in FIG. 3, communication can be performed between two vehicles 201 and 202 via a sidelink indicated by two thick arrows labeled "SL". The UE 100 shown in FIG. 1 may be vehicle 201, another user equipment communicating with UE 100 may be vehicle 202, or vice versa. To avoid redundancy, the same content as in FIG. 2 will not be described again. Different from FIG. 2, in FIG. 3, a BS 310 further exists, and both two vehicles 201 and 202 are within the coverage of BS 310. Also, Uu communication can be performed between each of the two vehicles 201 and 202 and BS 310 as indicated by respective thin arrows labeled "DL" or "UL".

[0026] FIG. 3 shows an exemplary scenario where sidelink transmission and reception coexist with Uu communication in NR. For example, the BWP allocated for sidelink transmission and reception in a carrier is used only for sidelink, that is, not shared with Uu communication. And as described above, dynamic BWP switching is not supported for sidelink transmission and reception. In addition, another BWP is allocated for Uu communication in the same carrier. For example, assuming that vehicle 201 is UE 100, another BWP in the carrier can be allocated for the signaling between vehicle 201 and BS 310. Further, more BWPs may be allocated for the signaling between vehicle 201 and BS 310, and dynamic BWP switching may still be supported within these BWPs allocated for Uu communication.

[0027] For example, FIG. 4 schematically shows an exemplary scenario of BWP allocation for both sidelink and Uu according to an embodiment of the present disclosure. FIG. 4 shows an example of BWP allocation for both sidelink and Uu in the same uplink carrier in the case of frequency division duplexing (FDD). As shown in FIG. 4, two BWPs, namely uplink BWP1 and uplink BWP2, are allocated for Uu communication and can be dynamically switched between each other, while one BWP, namely sidelink BWP, is allocated only for sidelink transmission and reception. Uplink BWP1, uplink BWP2, and sidelink BWP are within the same carrier. Such a carrier may correspond to a licensed carrier in which sidelink and Uu can coexist.

[0028] Here, uplink BWP1 and uplink BWP2 may be regarded as Uu BWPs that mean BWPs for eMBB traffic, URLLC traffic, or similar traffic.

[0029] According to the above configuration in the present disclosure, Uu communication and sidelink communication do not affect each other in the same carrier, the sidelink receiver design is simplified, and it does not affect Uu operations in the uplink such as dynamic BWP switching.

[0030] According to an embodiment of the present disclosure, in the UE100 shown in FIG. 1, one BWP and another BWP are simultaneously active in a carrier.

[0031] For example, as shown in FIG. 4, during the first period T1, sidelink BWP and uplink BWP2 are active, and during the second period T2, sidelink BWP and uplink BWP1 are active.

[0032] Therefore, in the present disclosure, two or more BWPs can be simultaneously active in an uplink carrier to support the coexistence of sidelink and Uu.

[0033] According to one embodiment of the present disclosure, in the UE 100 shown in FIG. 1, a BWP and another BWP are associated with the same downlink (DL) BWP within a carrier.

[0034] For example, in the case of FDD, one UL BWP is paired with one DL BWP. On the other hand, in the present disclosure, as described above, since a plurality of BWPs can be active simultaneously, the plurality of BWPs can be associated with the same DL BWP in a carrier.

[0035] For example, FIG. 5 schematically shows an exemplary scenario of the association between an uplink / sidelink BWP and a downlink BWP according to one embodiment of the present disclosure. FIG. 5 corresponds to the case of FDD. As shown in FIG. 5, the Uu UL BWP and the BWP for sidelink are within the same uplink carrier, and both are associated with the same Uu DL BWP as indicated by two curved arrows. For example, both the UL grant for scheduling resources in the Uu UL BWP and the sidelink grant for scheduling sidelink resources can be transmitted in this Uu DL BWP. Here, the sidelink transmission and reception may be, for example, gNB-based scheduling transmission.

[0036] Figure 5 shows the case of FDD, but the present disclosure is not limited thereto. Figure 6 schematically shows another exemplary scenario of the association between the uplink / side link BWP and the downlink BWP according to an embodiment of the present disclosure. Figure 6 corresponds to the case of time division duplex (TDD). In the case of TDD, it is well known that the same BWP is operated for both UL and DL. For example, as shown in Figure 6, the Uu BWP and the side link BWP are within the same carrier. The Uu BWP is allocated for both UL transmission and DL transmission, and UL and DL use the Uu BWP in a time division manner. For example, as shown by the box filled with dots and labeled "GAP" in Figure 6, there may be a gap between the duration for DL and the duration for UL. In this case, both the side link BWP and the Uu UL BWP (i.e., UL in the Uu BWP) are associated with the same Uu DL BWP (i.e., DL in the Uu BWP), as shown by the two curved arrows.

[0037] Similar to the case of FDD shown in Figure 5, in the case of TDD, both the UL grant for scheduling resources in the Uu UL BWP and the side link grant for scheduling side link resources can be transmitted in the Uu DL BWP. Here, the side link transmission and reception may be, for example, gNB-based scheduling transmissions.

[0038] Furthermore, when the Uu is switched to another BWP, the side link BWP may be associated with the DL in that BWP.

[0039] According to an embodiment of the present disclosure, in the UE100 shown in Figure 1, the side link duration of the slot in the BWP is changed along with the change of the slot format in another BWP in the case of time division duplex (TDD).

[0040] For example, as shown in FIG. 6, in the Uu BWP, the ratio of the DL duration to the UL duration of a slot can be changed, that is, the UL duration T can be changed. Correspondingly, the duration of the sidelink resources in the slots on the sidelink BWP is changed along with the change of the UL duration so as to be consistent with the UL duration.

[0041] According to one embodiment of the present disclosure, in the UE100 shown in FIG. 1, whether to transmit a first channel in a certain BWP or receive a second channel in another BWP is determined based on the priority of the first channel and the priority of the second channel.

[0042] For example, this relates to solving the half-duplex problem. As described above, when sidelink communication and Uu communication coexist in a carrier, two BWPs for sidelink and Uu respectively can be active simultaneously. However, in this case, the reception or transmission of the UE can be restricted by half-duplex. According to the present disclosure, whether the UE transmits one channel or receives another channel can be based on the priorities of the two channels. For example, the UE should drop the channel with a lower priority. Here, the above priorities may be related to traffic priorities, content priorities, etc.

[0043] For example, the UE needs to transmit a Uu signal on one BWP in a certain carrier and receive a sidelink signal on another BWP in the same carrier. Assume that the sidelink always has a higher priority. In this case, the UE should drop the Uu signal and receive the sidelink signal. It should be noted that this example is for illustration only and the present disclosure is not limited thereto.

[0044] According to an embodiment of the present disclosure, in UE100 shown in FIG. 1, which of a first channel on a certain BWP and a second channel on another BWP is transmitted is determined based on the priority of the first channel and the priority of the second channel when the power spectral density (PSD) difference between the first channel and the second channel is greater than a threshold value.

[0045] For example, this relates to solving the problem of the PSD difference. As described above, when sidelink communication and Uu communication coexist in a carrier, two BWPs for sidelink and Uu respectively can be active simultaneously. However, when the UE needs to transmit one channel on the sidelink BWP and another channel on the Uu BWP simultaneously, the UE may encounter a situation where the PSD difference between these two channels is too large, for example, greater than a predetermined threshold value. According to the present disclosure, which of the two channels is transmitted can be based on the priorities of the two channels. For example, the UE should drop the channel with a lower priority. Here, the above priorities may be related to traffic priorities, content priorities, etc.

[0046] For example, assume that the UE needs to transmit a Uu signal on one BWP in a certain carrier while transmitting a sidelink signal on another BWP in the same carrier, and the sidelink always has a higher priority. In this case, the UE should drop the Uu signal and transmit the sidelink signal. It should be noted that this example is for illustration only, and the present disclosure is not limited thereto.

[0047] As described above, it has been unclear so far how to configure the resources for sidelink transmission and reception in NR. In order to realize resource configuration for sidelink communication in LTE V2X, the concept of a resource pool has been adopted, and in order to realize resource configuration in NR, the concept of BWP has been adopted. However, reusing both existing BWP and resource pool signaling seems to be a redundant and complex signaling design (at least in terms of frequency) for sidelink resources.

[0048] In view of the above, according to an embodiment of the present disclosure, in the UE 100 shown in FIG. 1, the BWP is set by BWP configuration signaling including a bitmap indicating time domain resources for sidelink transmission and reception.

[0049] For example, firstly, in order to configure a sidelink-specific BWP, for example, a sidelink-specific field in the LTE resource pool can be added to the BWP configuration signaling (taking, for example, the field of Rel. 14 as an example) to indicate the frequency and other information related to the NR sidelink. Basically, the sidelink-specific BWP can be configured as shown in FIG. 4, for example. Further, a bitmap is added to the BWP configuration signaling to indicate the time domain resources related to the sidelink. In this way, resource pool configuration related to the sidelink is not required. For example, the following code shows an example of BWP configuration signaling.

Number

[0050] In the above exemplary code, the LTE resource pool related field is included in the NR BWP configuration as shown by the bold code in the last few lines. It should be noted that the above exemplary code is for illustration purposes only, and the present disclosure is not limited thereto, and those skilled in the art will be able to write various codes according to specific requirements.

[0051] In addition, when the UE 100 is within the coverage of a BS (for example, the BS 310 shown in FIG. 3), the UE can receive BWP configuration signaling from the BS and configure one BWP according to the BWP configuration signaling from the BS. Otherwise, when the UE 100 is outside the coverage of the BS, that is, when the UE cannot receive BWP configuration signaling from the BS, one BWP can be pre-configured by the operator. For example, when designing the UE, the operator can pre-configure the BWP configuration signaling and store it in the UE. Therefore, in this case, the UE does not need to receive BWP configuration signaling from the BS.

[0052] According to the above BWP configuration signaling, the impact on the NR protocol in the present disclosure is small.

[0053] In the above embodiment, the BWP is described by taking the form of sidelink resources as an example, but the present disclosure is not limited thereto. For example, in the case of an unlicensed carrier as described above, one BWP can be equivalent to one carrier. In other words, in the case of an unlicensed carrier, BWP configuration may no longer exist. In this case, in the UE 100 shown in FIG. 1, the BWP is configured by resource pool configuration signaling including BWP-specific information.

[0054] For example, the principle of resource pool signaling in LTE V2X can be reused. NR BWP-specific information such as subcarrier spacing can be directly indicated in the resource pool configuration signaling. For example, the following code shows an example of resource pool configuration signaling.

Number

[0055] In the above exemplary code, an NR BWP related field is included in the resource pool configuration as indicated by the bold code in the last line. The above exemplary code is for illustration purposes only and the present disclosure is not limited thereto. It should be noted that those skilled in the art will be able to write various codes according to specific requirements. Therefore, signaling design and UE behavior can be simplified.

[0056] Similarly, when UE100 is within the coverage of a BS (e.g., BS310 shown in FIG. 3), the UE can receive resource pool configuration signaling from the BS. Otherwise, when UE100 is outside the coverage of the BS, one BWP can be pre-configured by the operator. For example, when designing the UE, the operator can pre-configure the resource pool configuration signaling and store it in the UE. Therefore, in this case, the UE does not need to receive resource pool configuration signaling from the BS.

[0057] The above exemplary design of sidelink resource configuration signaling is applicable to both the gNB scheduling-based transmission mode and the UE autonomous-based transmission mode. For example, in the case of the gNB scheduling-based transmission mode, the BWP ID in the sidelink grant can be interpreted as the resource pool ID, or such a field does not exist. Furthermore, the exemplary design of sidelink resource configuration signaling is applicable to both the Uu carrier and the ITS carrier, as well as both normal resources (e.g., BWP or resource pool) and exceptional resources for sidelink operation. In addition, different sidelink resources can have different cyclic prefix (CP) / subcarrier spacing.

[0058] In the above, with reference to FIGS. 1 to 6, UE100 was described in detail. According to UE100, since dynamic BWP switching is not supported for sidelink transmission and reception, the complexity of the receiver design can be reduced and the system performance can be improved.

[0059] In another embodiment of the present disclosure, there is provided a user equipment comprising a circuit operable to determine a bandwidth part (BWP) allocated for sidelink transmission and reception in a carrier, and a transceiver operable to perform sidelink transmission and reception on the determined BWP in the carrier, wherein two or more BWPs are active simultaneously in the carrier.

[0060] For example, compared with the current NR that supports only one BWP active at a time in the uplink / downlink carrier, in the user equipment according to the present embodiment of the present disclosure, two or more BWPs can be active simultaneously in the uplink carrier.

[0061] Note that, unlike the UE100 shown in FIG. 1, there is no such limitation that dynamic BWP switching is not supported for sidelink transmission and reception in the user equipment according to the present embodiment, that is, in the present embodiment, dynamic BWP switching may or may not be supported for sidelink transmission and reception based on specific situations.

[0062] According to one embodiment of the present disclosure, two or more BWPs include a BWP allocated for sidelink transmission and reception in a carrier and another BWP allocated for transmission between the user equipment and the base station in the carrier.

[0063] For example, one BWP dedicated to sidelink transmission and reception and another BWP dedicated to uplink communication can be active simultaneously in the uplink carrier, and as a result, sidelink and Uu can coexist in the uplink carrier.

[0064] In another embodiment of the present disclosure, a base station as shown in FIG. 7 is provided. FIG. 7 shows a partial block diagram of a base station 700 according to an embodiment of the present disclosure. As shown in FIG. 7, the BS 700 can include a circuit 710 and a transmitter 720. The circuit 710 operates to generate bandwidth part (BWP) setting signaling including a bitmap indicating time domain resources for sidelink transmission and reception. The transmitter 720 operates to transmit the BWP setting signaling to a user equipment. The BWP allocated for sidelink transmission and reception in a carrier is determined by the user equipment based on the BWP setting signaling, and dynamic BWP switching is not supported for sidelink transmission and reception in the carrier.

[0065] For example, the BS 700 may be the BS 310 shown in FIG. 3, the user equipment may be the UE 100 shown in FIG. 1, or the vehicle 201 shown in FIG. 3. As described above, when the UE 100 is within the coverage of the BS 700, the UE 100 can receive the BWP setting signaling from the BS 700 and determine the BWP allocated for sidelink transmission and reception in the carrier based on the BWP setting signaling.

[0066] According to an embodiment of the present disclosure, the above BWP is used only for sidelink transmission and reception, another BWP is allocated for transmission between the user equipment and the base station in the carrier, and the transmitter 720 further operates to transmit a downlink signal to the user equipment on the downlink (DL) BWP in the carrier.

[0067] For example, as described above with reference to FIG. 3, the vehicle 201 can perform Uu communication with the BS 310 and perform sidelink transmission and reception with the vehicle 202.

[0068] According to BS700, since dynamic BWP switching is not supported for sidelink transmission and reception, the complexity of receiver design can be reduced, and system performance can be improved. In addition, according to the above BWP configuration signaling, the impact on the NR protocol in the present disclosure is small.

[0069] FIG. 8 shows a detailed block diagram of a user equipment 800 according to an embodiment of the present disclosure. As shown in FIG. 8, the UE 800 includes an encoder 801, a modulator 802, a resource mapper 803, a resource multiplexer 804, a first signal processor 805, a transmitter 806, an antenna 807, a receiver 808, a second signal processor 809, a resource demultiplexer 810, a resource demapper 811, a demodulator 812, a decoder 813, and a control circuit 814.

[0070] For example, the encoder 801 performs an encoding process on the transmission data, and the modulator 802 performs a modulation process on the encoded transmission data to generate data symbols. The resource mapper 803 maps the data symbols to physical resources. For example, when the transmission data belongs to sidelink data transmitted to another UE, the resource mapper 803 maps the data symbols to the BWP allocated for sidelink transmission and reception. The resource multiplexer 804 multiplexes the data symbols with possible control information and / or synchronization information. The first signal processor 805 performs signal processing on the multiplexed signal output from the resource multiplexer 804. The transmitter 806 transmits the processed sidelink signal to another UE via, for example, the antenna 807.

[0071] Here, the operations of the encoder 801, modulator 802, resource mapper 803, and resource multiplexer 804 are controlled by the control circuit 814. For example, the control circuit 814 can determine the BWP allocated for sidelink transmission and reception in a carrier. The resource mapper 803 maps sidelink data symbols to the determined BWP, and the transmitter 806 transmits a sidelink signal to another UE on the determined BWP in the carrier. Also, the control circuit 814 may control dynamic switching for sidelink transmission and reception. In the present disclosure, dynamic switching is not supported for sidelink transmission and reception.

[0072] In addition, the receiver 808 can receive a sidelink signal from another UE via the antenna 807. The second signal processor 809 performs signal processing on the sidelink signal received by the receiver 808. The resource demultiplexer 810 demultiplexes the processed sidelink signal into sidelink data and sidelink control information and / or synchronization information that may exist. The resource demapper 811 demaps sidelink data symbols and sidelink control information and / or synchronization information that may exist from physical resources, for example, the BWP allocated for sidelink transmission and reception. The demodulator 812 performs demodulation processing on the sidelink data symbols, and the decoder 813 performs decoding processing on the demodulated sidelink data symbols to obtain received data. In addition, the demodulator 812 can also perform demodulation processing on sidelink control information and / or synchronization information that may exist, and the decoder 813 performs decoding processing on the demodulated sidelink control information and / or synchronization information and outputs the sidelink control information and / or synchronization information to the control circuit 814 for controlling sidelink transmission and reception.

[0073] In the above case, as described above, it is possible to handle the case of an unlicensed carrier without Uu communication, but the present disclosure is not limited thereto. In the case of a licensed carrier, the UE 800 can transmit an uplink signal to a base station (e.g., BS 310 shown in FIG. 3) through an encoder 801, a modulator 802, a resource mapper 803, a resource multiplexer 804, a first signal processor 805, a transmitter 806, an antenna 807, and a control circuit 814. For example, the control circuit 814 can determine another BWP allocated for the transmission between the UE 800 and the base station in the carrier, and correspondingly control the resource mapper 803. The transmitter 806 transmits the UL signal to the BS via the antenna 807 on another BWP allocated for the transmission between the UE 800 and the BS in the carrier.

[0074] Furthermore, as described above, the control circuit 814 can determine two or more BWPs allocated for the transmission between the UE 800 and the base station in the carrier, and correspondingly control the resource mapper 803. The transmitter 806 transmits the UL signal to the BS via the antenna 807 on one of the two or more BWPs allocated for the transmission between the UE 800 and the BS in the carrier. Dynamic BWP switching is supported within these BWPs.

[0075] Similarly, in the case of a licensed carrier, the UE 800 can also receive a downlink signal from a base station (e.g., BS 310 shown in FIG. 3) through an antenna 807, a receiver 808, a second signal processor 809, a resource demultiplexer 810, a resource demapper 811, a demodulator 812, and a decoder 813. Since the principle of receiving a DL signal from the BS is well known to those skilled in the art, a detailed description is not provided to avoid redundancy.

[0076] It should be noted that the user equipment 800 shown in FIG. 8 may function as the UE100 shown in FIG. 1. Specifically, the combination of the transmitter 806 and the receiver 808 may correspond to the transceiver 120. The circuit 110 may include an encoder 801, a modulator 802, a resource mapper 803, a resource multiplexer 804, a first signal processor 805, a second signal processor 809, a resource demultiplexer 810, a resource demapper 811, a demodulator 812, a decoder 813, and a control circuit 814. Alternatively, one or more of these units may be separated from the circuit 110 according to specific requirements.

[0077] FIG. 9 schematically shows an example of a communication flowchart between the BS930 and the UEs 910, 920 according to an embodiment of the present disclosure. For example, the BS930 may be the BS700 shown in FIG. 7, and the UE910 may be the UE100 shown in FIG. 1 or the UE800 shown in FIG. 8.

[0078] For example, FIG. 9 may correspond to the case where the UEs 910 and 920 are within the coverage of the BS930, which is the same as that shown in FIG. 3. That is, the UEs 910 and 920 may respectively correspond to the vehicles 201 and 202, and the BS930 may correspond to the BS310.

[0079] As shown in FIG. 9, in step ST901, the UEs 910, 920 and the BS930 can connect to each other in a connection procedure. The connection may be established by implementing a known or future-developed method, the details of which are omitted herein.

[0080] In step ST902, UE910 can send a sidelink scheduling request to BS930. Next, in step ST903, BS930 decodes the sidelink scheduling request received from UE910 and generates sidelink control information. For example, as described above, the sidelink control information can include BWP configuration signaling for configuring a BWP dedicated to sidelink transmission and reception in a carrier.

[0081] In step ST904, BS930 sends the generated sidelink control information to UE910. Next, in step S905, UE910 processes the sidelink control information received from BS930. For example, UE910 can determine a BWP dedicated to sidelink transmission and reception in a carrier based on the BWP configuration signaling received from BS930.

[0082] In step ST906, UE910 and UE920 can perform sidelink transmission and reception with each other on a BWP dedicated to sidelink transmission and reception in a carrier.

[0083] Although not shown in FIG. 9, it should be noted that UE910 and / or UE920 may further perform signal interaction with BS930 on a BWP allocated for uplink transmission and downlink transmission. For example, UE910 may send a scheduling request for Uu to BS930 and receive control information for Uu from BS930. Since uplink communication and downlink communication between a UE and a BS are well known to those skilled in the art, they are not described in this specification.

[0084] FIG. 10 schematically shows an example of a flowchart of communication between UE1010 and UE1020 according to an embodiment of the present disclosure. For example, UE1010 may be UE100 shown in FIG. 1 or UE800 shown in FIG. 8.

[0085] For example, FIG. 10 may correspond to the case where both UE1010 and 1020 are outside the coverage of any BS, which is the same as that shown in FIG. 2. That is, UE1010 and 1020 may respectively correspond to vehicles 201 and 202 shown in FIG. 2.

[0086] As described above, when outside the coverage of any BS, UE1010 cannot receive control information including sidelink resource configuration signaling from any BS. In this case, UE1010 needs to pre-configure sidelink resources before performing sidelink transmission and reception with another UE. As shown in FIG. 10, in step ST1001, UE1010 pre-configures sidelink resources. For example, a BWP dedicated to sidelink transmission and reception in a carrier can be pre-configured by the operator. For example, when designing the UE, the operator can pre-set BWP configuration signaling and store it in UE1010, and UE1010 can determine the BWP dedicated to sidelink transmission and reception in the carrier based on this BWP configuration signaling.

[0087] In step ST1002, UE1010 can connect to UE1020 in the connection procedure. The connection may be established by implementing a known or future-developed method, the details of which are omitted in this specification.

[0088] In step ST1003, UE1010 and UE1020 can perform sidelink transmission and reception with each other on the BWP dedicated to sidelink transmission and reception in the carrier.

[0089] It should be noted here that the connection procedure is not required during sidelink transmission and reception, and two user equipments may directly communicate with each other without the connection procedure, so it is also possible to eliminate step ST1002.

[0090] In a further embodiment of the present disclosure, a wireless communication method for a user equipment as shown in FIG. 11 is provided. FIG. 11 shows a flowchart of a wireless communication method 1100 for a user equipment according to an embodiment of the present disclosure. For example, the wireless communication method 1100 may be applied to the UE100 / 800 shown in FIGS. 1 and 8.

[0091] As shown in FIG. 11, the wireless communication method 1100 starts at step S1101, in which a BWP allocated for sidelink transmission and reception in a carrier is determined. Then, in step S1102, sidelink transmission and reception are performed on the determined BWP in the carrier. Dynamic BWP switching is not supported for sidelink transmission and reception in the carrier. After step S1102, the wireless communication method 1100 ends. For example, another user equipment that performs sidelink transmission and reception with this user equipment may be the vehicle 202 shown in FIGS. 2 and 3.

[0092] According to the wireless communication method 1100, since dynamic BWP switching is not supported for sidelink transmission and reception, the complexity of the receiver design can be reduced, and the system performance can be improved.

[0093] Other technical features in the above-described user equipment 100 may also be incorporated into the wireless communication method 1100, but are not described here to avoid redundancy.

[0094] In a further embodiment of the present disclosure, a wireless communication method for a base station as shown in FIG. 12 is provided. FIG. 12 shows a flowchart of a wireless communication method 1200 for a base station according to an embodiment of the present disclosure. For example, the wireless communication method 1200 may be applied to the BS700 shown in FIG. 7.

[0095] As shown in FIG. 12, the wireless communication method 1200 starts at step S1201, in which bandwidth part (BWP) setting signaling including a bitmap indicating time domain resources for sidelink transmission and reception is generated. Next, at step S1202, the BWP setting signaling is transmitted to the user equipment. The BWP allocated for sidelink transmission and reception in the carrier is determined by the user equipment based on the BWP setting signaling. And dynamic BWP switching is not supported for sidelink transmission and reception in the carrier. After step S1202, the wireless communication method 1200 ends. For example, the user equipment may be the UE100 / 800 shown in FIGS. 1 and 8.

[0096] According to the wireless communication method 1200, since dynamic BWP switching is not supported for sidelink transmission and reception, the complexity of the receiver design can be reduced and the system performance can be improved. In addition, according to the BWP setting signaling, the impact on the NR protocol in the present disclosure is small.

[0097] Other technical features in the base station 700 described above may also be incorporated into the wireless communication method 1200, but are not described here to avoid redundancy.

[0098] In a further embodiment of the present disclosure, there is provided a wireless communication method for a user equipment, including determining a bandwidth part (BWP) allocated for sidelink transmission and reception in a carrier, and performing sidelink transmission and reception on the determined BWP in the carrier, where two or more BWPs are simultaneously active in the carrier.

[0099] This disclosure can be implemented by software, by hardware, or by software cooperating with hardware. Each functional block used in the description of each of the above-described embodiments can be implemented by LSI as an integrated circuit, and each process described in each embodiment can be controlled by LSI. LSI can be formed individually as a chip, or one chip can be formed to include part or all of the functional blocks. LSI can include a data input / output section coupled to itself. Here, LSI may be referred to as IC, system LSI, super LSI, or ultra LSI depending on the difference in integration degree. However, the technology for realizing the integrated circuit is not limited to LSI, and can be realized by using a dedicated circuit or a general-purpose processor. Furthermore, an FPGA (Field Programmable Gate Array) that can be programmed after manufacturing the LSI, or a reconfigurable processor that can reconfigure the connection and setting of circuit cells arranged inside the LSI can also be used.

[0100] This disclosure is intended to be variously changed or modified by those skilled in the art based on the descriptions presented herein and known technologies without departing from the content and scope of this disclosure, and such changes and applications are included in the scope of claims for protection. Furthermore, components of the above-described embodiments may be arbitrarily combined within the scope not departing from the content of this disclosure.

[0101] Embodiments of this disclosure can provide at least the following subject matters.

[0102] (1) A circuit that operates to determine a bandwidth part (BWP) allocated for sidelink transmission and reception in a carrier, A transceiver that operates to execute the sidelink transmission and reception on the determined BWP in the carrier, Comprising, Dynamic BWP switching is not supported for the sidelink transmission and reception in the carrier. User equipment.

[0103] (2) The BWP is used only for the sidelink transmission and reception, and another BWP is allocated for the transmission between the user equipment and the base station in the carrier. The user equipment according to (1).

[0104] (3) The BWP and the other BWP are simultaneously active in the carrier. The user equipment according to (2).

[0105] (4) The BWP and the other BWP are associated with the same downlink (DL) BWP in the carrier. The user equipment according to (2).

[0106] (5) The sidelink duration of the slot in the BWP is changed along with the change of the slot format in the other BWP in the case of time division duplex (TDD). The user equipment according to (2).

[0107] (6) Whether to transmit the first channel in a certain BWP or receive the second channel in another BWP is determined based on the priority of the first channel and the priority of the second channel. The user equipment according to (2).

[0108] (7) Which of the first channel on a certain BWP and the second channel on another BWP is transmitted is determined based on the priority of the first channel and the priority of the second channel when the power spectral density (PSD) difference between the first channel and the second channel is greater than a threshold. The user equipment described in (2).

[0109] (8) The BWP is set by BWP configuration signaling including a bitmap indicating time domain resources for the sidelink transmission and reception. The user equipment described in (1).

[0110] (9) A wireless communication method for a user equipment, determining a bandwidth part (BWP) allocated for sidelink transmission and reception in a carrier; performing the sidelink transmission and reception on the determined BWP in the carrier; including Dynamic BWP switching is not supported for the sidelink transmission and reception in the carrier. Wireless communication method.

[0111] (10) The BWP is used only for the sidelink transmission and reception, and another BWP is allocated for the transmission between the user equipment and the base station in the carrier. The wireless communication method according to (9).

[0112] (11) The BWP and the other BWP are simultaneously active in the carrier. The wireless communication method according to (10).

[0113] (12) The BWP and the other BWP are associated with the same downlink (DL) BWP in the carrier. The wireless communication method according to (10).

[0114] (13) In the case of time division duplex (TDD), the side link duration of the slot in the BWP is changed along with the change of the slot format in the other BWP. The wireless communication method according to (10).

[0115] (14) Whether to transmit the first channel in a certain BWP or receive the second channel in another BWP is determined based on the priority of the first channel and the priority of the second channel. The wireless communication method according to (10).

[0116] (15) Which of the first channel on a certain BWP and the second channel on another BWP is transmitted is determined based on the priority of the first channel and the priority of the second channel when the power spectral density (PSD) difference between the first channel and the second channel is greater than a threshold. The wireless communication method according to (10).

[0117] (16) The BWP is set by BWP configuration signaling including a bitmap indicating time domain resources for side link transmission and reception. The wireless communication method according to (9).

[0118] (17) A circuit operating to generate bandwidth part (BWP) configuration signaling including a bitmap indicating time domain resources for side link transmission and reception; A transmitter operating to transmit the BWP configuration signaling to a user equipment; Comprising The BWP allocated for the side link transmission and reception in a carrier is determined by the user equipment based on the BWP configuration signaling. Dynamic BWP switching is not supported for the side link transmission and reception in the carrier. Base station.

[0119] (18) The BWP is used only for the sidelink transmission and reception, and another BWP is allocated for the transmission between the user equipment and the base station in the carrier, The transmitter further operates to transmit a downlink signal to the user equipment on a downlink (DL) BWP in the carrier. The base station according to (17).

[0120] (19) The BWP and the another BWP are simultaneously active in the carrier. The base station according to (18).

[0121] (20) The BWP and the another BWP are associated with the same downlink (DL) BWP in the carrier. The base station according to (18).

[0122] (21) The sidelink duration of a slot in the BWP is changed along with the change of the slot format in the another BWP in the case of time division duplex (TDD). The base station according to (18).

[0123] (22) Whether to transmit a first channel in a certain BWP or receive a second channel in another BWP is determined based on the priority of the first channel and the priority of the second channel. The base station according to (18).

[0124] (23) Whether the first channel on a certain BWP or the second channel on another BWP is transmitted is determined based on the priority of the first channel and the priority of the second channel when the power spectral density (PSD) difference between the first channel and the second channel is greater than a threshold value. The base station according to (18).

[0125] (24) A wireless communication method for a base station, generating bandwidth part (BWP) setting signaling including a bitmap indicating time domain resources for sidelink transmission and reception; transmitting the BWP setting signaling to a user equipment; including The BWP allocated for the sidelink transmission and reception in the carrier is determined by the user equipment based on the BWP setting signaling. Dynamic BWP switching is not supported for the sidelink transmission and reception in the carrier. Wireless communication method.

[0126] (25) The BWP is used only for the sidelink transmission and reception, and another BWP is allocated for the transmission between the user equipment and the base station in the carrier. The method further includes transmitting a downlink signal to the user equipment on a downlink (DL) BWP in the carrier. The wireless communication method according to (24).

[0127] (26) The BWP and the other BWP are simultaneously active in the carrier. The wireless communication method according to (25).

[0128] (27) The BWP and the other BWP are associated with the same downlink (DL) BWP in the carrier. The wireless communication method described in (25).

[0129] (28) In the case of time division duplex (TDD), the sidelink duration of a slot in the BWP is changed along with the change of the slot format in another BWP. The wireless communication method described in (25).

[0130] (29) Whether to transmit a first channel in a certain BWP or receive a second channel in another BWP is determined based on the priority of the first channel and the priority of the second channel. The wireless communication method described in (25).

[0131] (30) Which of a first channel on a certain BWP and a second channel on another BWP is transmitted is determined based on the priority of the first channel and the priority of the second channel when the power spectral density (PSD) difference between the first channel and the second channel is greater than a threshold value. The wireless communication method described in (25).

[0132] (31) A circuit that operates to determine a bandwidth part (BWP) allocated for sidelink transmission and reception in a carrier; A transceiver that operates to perform the sidelink transmission and reception on the determined BWP in the carrier; Comprising; Two or more BWPs are simultaneously active in the carrier. User equipment.

[0133] (32) The two or more BWPs include the BWP allocated for the sidelink transmission and reception in the carrier and another BWP allocated for the transmission between the user equipment and the base station in the carrier. The user equipment described in (31).

[0134] (33) A wireless communication method for a user equipment, determining a bandwidth part (BWP) allocated for sidelink transmission and reception in a carrier; performing the sidelink transmission and reception on the determined BWP in the carrier; comprising two or more BWPs are simultaneously active in the carrier, the wireless communication method.

[0135] (34) The two or more BWPs include the BWP allocated for the sidelink transmission and reception in the carrier and another BWP allocated for the transmission between the user equipment and a base station in the carrier. The wireless communication method according to (33).

Claims

1. A system comprising the base station and the user equipment, wherein a first bandwidth part (BWP) is allocated for sidelink communication in a carrier, and a second BWP is allocated for communication between the base station and the user equipment in the carrier, wherein the base station, has a transceiver for communicating with the user equipment in the second BWP, and wherein the user equipment, has a transceiver for performing sidelink communication in the first BWP and communicating with the base station in the second BWP, and wherein the second BWP is a BWP that can be dynamically switched among a plurality of second BWPs, and the first BWP is a BWP that cannot be dynamically switched. System.

2. Whether the user equipment performs sidelink communication in the first BWP or communicates with the base station in the second BWP is based on a priority order. The system according to Claim 1.

3. The first BWP and the second BWP are simultaneously active. The system according to Claim 1.

4. The second BWP is a BWP that is dynamically switched using DCI among a plurality of second BWPs, and the first BWP is a BWP that cannot be dynamically switched using DCI. The system according to Claim 1.

5. In the case of TDD (Time Division Duplex), the duration of a slot in the first BWP is changed along with a change in the slot format in the second BWP. The system according to Claim 1.

6. The first BWP is set by BWP setting signaling including a bitmap indicating time domain resources used for the sidelink communication. The system according to Claim 1.

7. In a system comprising the base station and the user equipment, wherein a first bandwidth part (BWP) is allocated for sidelink communication in a carrier, and a second BWP is allocated for communication between the base station and the user equipment in the carrier, wherein the base station communicates with the user equipment in the second BWP, wherein the user equipment performs sidelink communication in the first BWP and communicates with the base station in the second BWP, wherein the second BWP is a BWP that can be dynamically switched among a plurality of second BWPs, and the first BWP is a BWP that cannot be dynamically switched. Wireless communication method.

8. Whether the user equipment performs the sidelink communication in the first BWP or communicates with the base station in the second BWP is based on a priority order. The wireless communication method according to claim 7.

9. The first BWP and the second BWP are simultaneously active. The wireless communication method according to claim 7.

10. The second BWP is a BWP dynamically switched using DCI among a plurality of second BWPs, and the first BWP is a BWP that cannot be dynamically switched using DCI. The wireless communication method according to claim 7.

11. The duration of a slot in the first BWP is changed along with a change in the slot format in the second BWP in the case of TDD (Time Division Duplex). The wireless communication method according to claim 7.

12. The first BWP is set by BWP configuration signaling including a bitmap indicating time domain resources used for the sidelink communication. The wireless communication method according to claim 7.

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