Enodeb, user equipment, and wireless communication method

Abstract

An eNB, a UE and a wireless communication method are provided. The eNB in embodiments includes: a circuit that fills an SPS activation / deactivation field in a DCI with a predetermined bit pattern; and a sending unit that sends the DCI to a first UE for the first UE to start or stop periodically sending a signal to a second UE based on the SPS activation / deactivation field, the DCI being in an SPS format formed by employing part or all bits of at least one field of a DCI format 5 as the SPS activation / deactivation field, and information that should be sent in the at least one field being indicated with the help of or by RRC or MAC signaling.

Description

[0001] This application is a divisional application of the invention patent application filed on January 29, 2016, with application number 201680078455.2 and invention title "eNodeB, User Equipment and Wireless Communication Method". Technical Field

[0002] This disclosure relates to the field of wireless communications, and more specifically, to an eNode B (eNB), user equipment (UE), and wireless communication method for semi-static scheduling (SPS) activation / deactivation. Background Technology

[0003] V2X refers to communication between vehicles (V2V) and communication between vehicles and pedestrians.

[0004] Vehicle-to-Platform (V2P), vehicle-to-infrastructure (V2I), or vehicle-to-network (V2N) communication. V2X is currently being discussed in 3GPP RAN1, and one starting point for research is based on the LTE Release 12 / Release 13 Device-to-Device (D2D) framework. Summary of the Invention

[0005] A non-limiting exemplary embodiment provides a method for facilitating SPS activation / deactivation in V2X or D2D.

[0006] In a first general aspect of this disclosure, an eNode B (eNB) is provided, comprising: circuitry that fills a semi-static scheduling (SPS) activation / deactivation field in a downlink control information (DCI) with a predetermined bit pattern; and a transmission unit that transmits the DCI to a first user equipment (UE) for the first UE to start periodically transmitting signals to a second UE or stop periodically transmitting signals to the second UE based on the SPS activation / deactivation field, wherein the DCI is in an SPS format formed by using some or all bits of at least one field of DCI format 5 as the SPS activation / deactivation field, and the information to be transmitted in the at least one field is indicated by the assistance of radio resource control (RRC) or media access control (MAC) signaling or by means of RRC or MAC signaling.

[0007] In a second general aspect of this disclosure, an eNode B (eNB) is provided, comprising: circuitry that scrambles a cyclic redundancy check (CRC) of downlink control information (DCI) with a radio network temporary identifier (RNTI); and a transmission unit that transmits the DCI to a first user equipment (UE) for the first UE to determine, based solely on the RNTI, whether to transmit a signal to a second UE once, to begin periodically transmitting a signal to the second UE, or to stop periodically transmitting a signal to the second UE, wherein the DCI is in DCI format 5.

[0008] In a third general aspect of this disclosure, an eNode B (eNB) is provided, comprising: circuitry that fills a semi-static scheduling (SPS) activation / deactivation field in a first downlink control information (DCI) with a predetermined bit pattern; and a transmission unit that transmits the first DCI to a first user equipment (UE) for the first UE to transmit a signal to a second UE once, to begin periodically transmitting a signal to the second UE, or to stop periodically transmitting a signal to the second UE based on the SPS activation / deactivation field, wherein the first DCI is in a format formed by additionally adding the SPS activation / deactivation field to DCI format 5; the transmission unit also transmits a second DCI to the first UE for the first UE to transmit a signal to the eNB; and the second DCI is in DCI format 0 / 1A in which all conventional fields are enabled or in a format formed by additionally adding fields identical to those added to DCI format 5 to DCI format 0 / 1A, such that the size of the first DCI is the same as the size of the second DCI.

[0009] In a fourth general aspect of this disclosure, a user equipment (UE) is provided, comprising: a receiving unit that receives downlink control information (DCI) transmitted from an eNode B (eNB); and a transmitting unit that starts periodically transmitting signals to another UE or stops periodically transmitting signals to the other UE based on an SPS activation / deactivation field in the DCI, wherein the DCI is in an SPS format formed by using some or all bits of at least one field of DCI format 5 as the SPS activation / deactivation field, and indicates information to be transmitted in the at least one field with the aid of Radio Resource Control (RRC) or Media Access Control (MAC) signaling or by means of RRC or MAC signaling.

[0010] In a fifth general aspect of this disclosure, a user equipment (UE) is provided, comprising: a receiving unit that receives downlink control information (DCI) transmitted from an eNode B (eNB); and circuitry that determines, based solely on a radio network temporary identifier (RNTI) scrambled with the cyclic redundancy check (CRC) of the DCI, whether to transmit a signal to another UE once, to begin periodically transmitting signals to the other UE, or to stop periodically transmitting signals to the other UE; wherein the DCI is in DCI format 5.

[0011] In a sixth general aspect of this disclosure, a user equipment (UE) is provided, comprising: a receiving unit that receives first downlink control information (DCI) transmitted from an eNode B (eNB); and a transmitting unit that transmits a signal to another UE once, starts periodically transmitting the signal to the other UE, or stops periodically transmitting the signal to the other UE based on an SPS activation / deactivation field in the first DCI, wherein the first DCI is in a format formed by additionally adding the SPS activation / deactivation field to DCI format 5; the receiving unit also receives a second DCI transmitted from the eNB for the transmitting unit to transmit the signal to the eNB; and the second DCI is in DCI format 0 / 1A in which all conventional fields are enabled or in a format formed by additionally adding fields identical to those added to DCI format 5 to DCI format 0 / 1A, such that the size of the first DCI is the same as the size of the second DCI.

[0012] In a seventh general aspect of this disclosure, a wireless communication method performed by an eNode B (eNB) is provided, comprising: filling a semi-static scheduling (SPS) activation / deactivation field in a downlink control information (DCI) with a predetermined bit pattern; and transmitting the DCI to a first user equipment (UE) for the first UE to start periodically transmitting signals to a second UE or stop periodically transmitting signals to the second UE based on the SPS activation / deactivation field, wherein the DCI is in an SPS format formed by using some or all bits of at least one field of DCI format 5 as the SPS activation / deactivation field, and the information to be transmitted in the at least one field is indicated by the assistance of radio resource control (RRC) or media access control (MAC) signaling or by means of RRC or MAC signaling.

[0013] In an eighth general aspect of this disclosure, a wireless communication method performed by an eNode B (eNB) is provided, comprising: scrambling a cyclic redundancy check (CRC) of downlink control information (DCI) with a radio network temporary identifier (RNTI); and transmitting the DCI to a first user equipment (UE) for the first UE to determine, based solely on the RNTI, whether to send a signal to a second UE once, to begin periodically sending signals to the second UE, or to stop periodically sending signals to the second UE, wherein the DCI is in DCI format 5.

[0014] In a ninth general aspect of this disclosure, a wireless communication method performed by an eNode B (eNB) is provided, comprising: filling a semi-static scheduling (SPS) activation / deactivation field in a first downlink control information (DCI) with a predetermined bit pattern; transmitting the first DCI to a first user equipment (UE) for the first UE to transmit a signal to a second UE once, to begin periodically transmitting a signal to the second UE, or to stop periodically transmitting a signal to the second UE based on the SPS activation / deactivation field, wherein the first DCI is in a format formed by additionally adding the SPS activation / deactivation field to DCI format 5; and transmitting a second DCI to the first UE for the first UE to transmit a signal to the eNB, wherein the second DCI is in DCI format 0 / 1A in which all conventional fields are enabled or in a format formed by additionally adding fields identical to those added to DCI format 5 to DCI format 0 / 1A, such that the size of the first DCI is the same as the size of the second DCI.

[0015] In a tenth general aspect of this disclosure, a wireless communication method performed by a user equipment (UE) is provided, comprising: receiving downlink control information (DCI) transmitted from an eNode B (eNB); starting or stopping periodically transmitting signals to another UE based on an SPS activation / deactivation field in the DCI, wherein the DCI is in an SPS format formed by using some or all bits of at least one field of DCI format 5 as the SPS activation / deactivation field, and indicating information to be transmitted in the at least one field by radio resource control (RRC) or media access control (MAC) signaling or with the aid of RRC or MAC.

[0016] In the eleventh general aspect of this disclosure, a wireless communication method performed by a user equipment (UE) is provided, comprising: receiving downlink control information (DCI) transmitted from an eNode B (eNB); and determining, based solely on a radio network temporary identifier (RNTI) scrambled with a cyclic redundancy check (CRC) of the DCI, whether to transmit a signal to another UE once, to begin periodically transmitting signals to the other UE, or to stop periodically transmitting signals to the other UE; wherein the DCI is in DCI format 5.

[0017] In a twelfth general aspect of this disclosure, a wireless communication method performed by a user equipment (UE) is provided, comprising: receiving first downlink control information (DCI) transmitted from an eNode B (eNB); transmitting a signal to another UE once based on an SPS activation / deactivation field in the first DCI, starting to periodically transmit the signal to the other UE, or stopping periodically transmitting the signal to the other UE, wherein the first DCI is in a format formed by additionally adding the SPS activation / deactivation field to DCI format 5; and receiving a second DCI from the eNB for transmitting the signal to the eNB by the transmitting unit, wherein the second DCI is in DCI format 0 / 1A in which all conventional fields are enabled, or in a format formed by additionally adding fields identical to those added to DCI format 5 to DCI format 0 / 1A, such that the size of the first DCI is the same as the size of the second DCI.

[0018] In the thirteenth general aspect of this disclosure, a first communication device is provided, comprising: a receiving unit that receives first downlink control information (DCI) from a second communication device, wherein the first DCI includes an activation / release field for activating / releasing semi-persistent scheduling (SPS) in addition to all fields of a third DCI, wherein the first DCI is scrambled with an RNTI different from that of the third DCI, the RNTI indicating whether it is an SPS, wherein the first DCI is set to have the same size as the second DCI by using padding bits; wherein the second DCI is used for communication between the first and second communication devices; and a transmitting unit that transmits semi-persistent scheduling data to a third communication device or terminates semi-persistent scheduling data to the third communication device based on the activation / release field of the first DCI.

[0019] In the fourteenth general aspect of this disclosure, a first communication method for a first communication device is provided, comprising: receiving first downlink control information (DCI) from a second communication device, wherein the first DCI includes an activation / release field for activating / releasing semi-persistent scheduling (SPS) in addition to all fields of a third DCI, wherein the first DCI is scrambled with an RNTI different from that of the third DCI, the RNTI indicating whether it is an SPS, wherein the first DCI is set to have the same size as the second DCI by using padding bits; wherein the second DCI is used for communication between the first and second communication devices, and semi-persistent scheduling data is sent to a third communication device or terminated to the third communication device based on the activation / release field of the first DCI.

[0020] In the fifteenth aspect of this disclosure, a second communication device is provided, comprising: a generation unit that generates first downlink control information (DCI), wherein the first DCI includes an activation / release field for activating / releasing semi-persistent scheduling (SPS) in addition to all fields of a third DCI, the activation / release field indicating the start or termination of semi-persistent scheduling data to a third communication device, wherein the first DCI is scrambled with an RNTI different from the third DCI, the RNTI indicating whether it is an SPS, wherein the first DCI is set to have the same size as the second DCI by using padding bits; wherein the second DCI is used for communication between the first communication device and the second communication device; and a transmission unit that transmits the first DCI to the first communication device.

[0021] In the sixteenth general aspect of this disclosure, a second communication method for a second communication device is provided, comprising: generating first downlink control information (DCI), wherein the first DCI includes an activation / release field for activating / releasing a semi-persistent scheduling (SPS) other than all fields of a third DCI, the activation / release field indicating the start or termination of semi-persistent scheduling data to the third communication device, wherein the first DCI is scrambled with an RNTI different from the third DCI, the RNTI indicating whether it is an SPS, wherein the first DCI is set to have the same size as the second DCI by using padding bits; wherein the second DCI is used for communication between the first communication device and the second communication device, and the first DCI is sent to the first communication device.

[0022] In the seventeenth aspect of this disclosure, an integrated circuit for a first communication device is provided, comprising: circuitry that controls: receiving first downlink control information (DCI) from a second communication device, wherein the first DCI includes an activation / release field for activating / releasing semi-persistent scheduling (SPS) in addition to all fields of a third DCI, wherein the first DCI is scrambled with an RNTI different from that of the third DCI, the RNTI indicating whether it is an SPS, wherein the first DCI is set to have the same size as the second DCI by using padding bits; wherein the second DCI is used for communication between the first and second communication devices, and semi-persistent scheduling data is sent to a third communication device or terminated to the third communication device based on the activation / release field of the first DCI.

[0023] In the eighteenth general aspect of this disclosure, an integrated circuit for a second communication device is provided, comprising: circuitry that controls: generating first downlink control information (DCI), wherein the first DCI includes an activation / release field for activating / releasing semi-persistent scheduling (SPS) in addition to all fields of a third DCI, the activation / release field indicating the start or termination of semi-persistent scheduling data to the third communication device, wherein the first DCI is scrambled with an RNTI different from the third DCI, the RNTI indicating whether it is an SPS, wherein the first DCI is set to have the same size as the second DCI by using padding bits; wherein the second DCI is used for communication between the first and second communication devices, and the first DCI is sent to the first communication device.

[0024] It should be noted that general or specific embodiments can be implemented as a system, method, integrated circuit, computer program, storage medium or any alternative combination thereof.

[0025] Additional benefits and advantages of the disclosed embodiments will become clear from the description and drawings. Benefits and / or advantages may be obtained individually from the various embodiments and features in the description and drawings, thus eliminating the need to provide all embodiments and features to obtain one or more of these benefits and / or advantages. Attached Figure Description

[0026] The foregoing and other features of this disclosure will become more fully apparent from the following description and appended claims, taken in conjunction with the accompanying drawings. It should be understood that these drawings only illustrate several embodiments according to this disclosure and are therefore not intended to limit its scope. The disclosure will be described with additional features and details using the drawings, wherein...

[0027] Figure 1 This illustration schematically depicts an exemplary SPS transport in D2D or V2X;

[0028] Figure 2A block diagram of an eNB according to an embodiment of the present disclosure is shown schematically;

[0029] Figure 3 A flowchart illustrating a wireless communication method performed by an eNB according to an embodiment of the present disclosure;

[0030] Figure 4 A block diagram of a UE according to an embodiment of the present disclosure is shown schematically;

[0031] Figure 5 A flowchart illustrating a wireless communication method performed by a UE according to an embodiment of this disclosure is provided.

[0032] Figure 6 A flowchart illustrating a wireless communication method performed by an eNB according to an embodiment of the present disclosure;

[0033] Figure 7 A flowchart illustrating a wireless communication method performed by a UE according to an embodiment of this disclosure is provided.

[0034] Figure 8 A flowchart illustrating a wireless communication method performed by an eNB according to an embodiment of this disclosure; and

[0035] Figure 9 A flowchart illustrating a wireless communication method performed by a UE according to an embodiment of this disclosure is shown. Detailed Implementation

[0036] In the following detailed description, reference is made to the accompanying drawings, which form a part thereof. In the drawings, similar reference numerals typically identify similar components unless the context otherwise requires. It will be readily understood that various aspects of this disclosure can be arranged, substituted, combined, and designed in a variety of different configurations, all of which are clearly intended and constitute a part of this disclosure.

[0037] In D2D or V2X, one resource allocation mode is based on eNB scheduling. In this mode, the eNB sends a Directive Interpretation (DCI) to the transmitting UE for resource allocation, and the transmitting UE signals the receiving UE based on the resource allocation indicated by the DCI. However, the UE density in a D2D or V2X group can be very high, resulting in significant signaling overhead in the above resource allocation process. Considering this, SPS (Special Signaling System) can be a good resource allocation mechanism for saving control overhead. Figure 1 This illustration schematically depicts an exemplary SPS transmission in D2D or V2X. The eNB first sends an SPS activation signaling message to the transmitting UE, and then the transmitting UE periodically sends a signal to the receiving UE after receiving the SPS activation signaling message. The signal can be sent during a scheduling dispatch (SA) period, and the signal can include both SA and data (such as...). Figure 1(as shown) or may only include data. If the eNB decides to stop periodic transmission, it sends an SPS disable signaling to the transmitting UE, and when the transmitting UE receives the SPS disable signaling, it stops periodic transmission, i.e., does not start the next cycle.

[0038] This disclosure proposes a method for activating / deactivating SPS in D2D or V2X. Note that the proposal is applicable to all types of D2D or V2X communications. In this document, UE refers to any terminal device suitable for D2D or V2X (e.g., cell phones, tablets, any wireless communication devices installed in vehicles, etc.), and eNB refers to any base station suitable for resource allocation in D2D or V2X.

[0039] In this disclosure embodiment, the following are provided: Figure 2 The eNB 200 shown is... Figure 2 A block diagram of an eNB 200 according to an embodiment of the present disclosure is shown schematically. The eNB 200 may include: circuitry 201 that fills an SPS activation / deactivation field in the DCI with a predetermined bit pattern; and a transmission unit 202 that transmits the DCI to a first UE for the first UE to begin or cease periodically transmitting signals to a second UE based on the SPS activation / deactivation field, wherein the DCI is in an SPS format formed by employing some or all bits of at least one field of DCI format 5 as the SPS activation / deactivation field, and indicates information to be transmitted in said at least one field with the aid of Radio Resource Control (RRC) or Media Access Control (MAC) signaling or via RRC or MAC signaling.

[0040] In this embodiment, the eNB 200 transmits a DCI with an SPS activation / deactivation field to activate or deactivate SPS transmission from a first UE (transmitting UE) to a second (receiving UE). Here, the SPS activation / deactivation field is used to indicate whether SPS transmission is activated or deactivated, and it can be filled with a predetermined bit pattern (e.g., all bits can be filled with "0" or "1", or some bits can be filled with "0" and other bits with "1"). When the transmitting UE receives the DCI and detects the SPS activation / deactivation field, the transmitting UE activates or deactivates an already started SPS transmission based on the SPS activation / deactivation field. For example, when the transmitting UE detects an SPS activation / deactivation field with all bits set to "0", the transmitting UE activates SPS transmission to the receiving UE; when the transmitting UE detects an SPS activation / deactivation field with all bits set to "1", the transmitting UE deactivates SPS transmission to the receiving UE.

[0041] In this embodiment, the DCI described above can be based on DCI format 5 as specified in 3GPP TS 36.212, with some fields modified. Specifically, the DCI can be in a format (referred to herein as the SPS format) formed by using some or all bits of at least one field of DCI format 5 as SPS activation / deactivation fields. For example, the SPS activation / deactivation fields can have six or more bits selected from DCI format 5. In LTE Release 12 / 13, since DCI format 5 and DCI format 0 / 1A as specified in 3GPP TS 36.212 are of the same size and share the same search space, the SPS format described above, by reusing some or all bits of DCI format 5, can have the same size as DCI format 5 and DCI format 0 / 1A, and therefore will not increase the blind decoding time.

[0042] The reason why some or even all fields in DCI Format 5 can be reused for SPS activation / deactivation is that, from an SPS perspective, in D2D or V2X, it is potentially unnecessary for the eNB to dynamically indicate some or even any fields. Therefore, the information to be transmitted in the reused fields can be indicated via RRC or MAC signaling, or with the aid of RRC or MAC signaling. For example, since the eNB transmits DCI very infrequently in SPS, rapid adaptation for resource allocation (e.g., time resource modes) is not possible. Therefore, time resource modes can be indicated via RRC or MAC signaling; or, with the aid of RRC or MAC signaling, for example, the eNB can configure a set of time resource modes via RRC or MAC signaling, and only a few bits in the DCI are used to indicate a specific time resource mode in the configured set for SPS transmission. In this way, several bits in the "Time Resource Mode" field of DCI Format 5 can be saved for SPS activation / deactivation.

[0043] In the example, a different RNTI (referred to herein as the SPS RNTI) than the Radio Network Temporary Identifier (RNTI) used for DCI Format 5 can be applied to scramble the Cyclic Redundancy Check (CRC) of the DCI in the SPS format, to facilitate identification of the DCI in the SPS format and increase the robustness of the SPS activation / deactivation identifier. In another example, when the number of bits used to identify SPS activation / deactivation in the DCI is large enough to ensure the robustness of the SPS activation / deactivation identifier—specifically, when all bits of all fields in DCI Format 5 are used as the SPS activation / deactivation field—the RNTI used to scramble the CRC of the DCI in the SPS format can be the same as the RNTI used to scramble the CRC of the DCI in DCI Format 5. As mentioned above, in D2D or V2X, from the SPS viewpoint, the eNB may not need to dynamically indicate any fields. Therefore, all relevant information about the SPS can be indicated in the RRC or MAC signaling, and the DCI is only used for SPS activation / deactivation. In this case, since there are many bits used to identify SPS activation / deactivation, SPS RNTI is not required. Note that in legacy systems different from D2D or V2X, since the eNB needs to dynamically control ACK resources and DCI format type (0 or 1A), some information such as "HARQ-ACK resource offset" and "flags for distinguishing between format 0 and format 1A" still needs to be indicated in the DCI.

[0044] Tables 1-5 show several examples of bits in DCI format 5 that are reused for SPS activation / deactivation in V2X or D2D.

[0045] Table 1

[0046]

[0047]

[0048] Table 1 shows all the bits in all fields of DCI Format 5 used for SPS activation / deactivation in V2X or D2D. For example, all bits set to "0" indicates SPS activation, and all bits set to "1" indicates SPS deactivation.

[0049] Table 2

[0050]

[0051] Table 2 shows that most of the bits (MSB 6 bits) in the "Time Resource Mode" field of DCI Format 5 are used for SPS activation / deactivation in V2X or D2D.

[0052] Table 3

[0053]

[0054] Table 3 shows some bits in the "Time Resource Mode" field, the "TPC Commands for PSCCH and PSSCH" field, and the "Frequency Hopping Flag" field used for SPS activation / deactivation in V2X or D2D.

[0055] Table 4

[0056]

[0057]

[0058] Table 4 shows some bits in the "Resources for PSCCH" and "Resource Block Assignment and Hop Resource Allocation" fields used for SPS activation / deactivation in V2X or D2D. This example specifically applies to the subchannel concept mentioned in 3GPP RAN1 (referred to as RAN1 document R1-156607). When applying the subchannel concept, since the basic allocation unit is a subchannel comprising multiple PRBs and the PSCCH is located within a portion of the PRB in each subchannel, the "Resources for PSCCH" and "Resource Block Assignment and Hop Resource Allocation" fields can be simplified. Only some bits in these fields are used for subchannel indication, and other bits can be used for SPS activation / deactivation in V2X or D2D.

[0059] Table 5

[0060]

[0061]

[0062] Table 5 shows that different fields can be used for activation and deactivation. Specifically, the MSB6 bits in the "Time Resource Mode" field are used for SPS activation, and all fields are used for SPS deactivation.

[0063] In addition, such as Figure 2As shown, the eNB 200 according to this disclosure may optionally include: a CPU (Central Processing Unit) 210 for executing programs to process various data and control the operation of various units in the eNB 200; a ROM (Read-Only Memory) 213 for storing various programs required for executing various processes and controls performed by the CPU 210; a RAM (Random Access Memory) 215 for storing intermediate data temporarily generated during the processing and control performed by the CPU 210; and / or a storage unit 217 for storing various programs, data, etc. The aforementioned circuits 201 and transmitting unit 202, CPU 210, ROM 213, RAM 215, and / or storage unit 217 can be interconnected via a data and / or command bus 220 and transmit signals between each other.

[0064] The aforementioned components are not intended to limit the scope of this disclosure. According to one implementation of this disclosure, the functions of the circuit 201 and the transmitting unit 202 can be implemented in hardware, and the CPU 210, ROM 213, RAM 215, and / or storage unit 217 may not be necessary. Alternatively, the functions of the circuit 201 and the transmitting unit 202 can also be implemented in software in combination with the CPU 210, ROM 213, RAM 215, and / or storage unit 217.

[0065] The eNB 200 may also include a receiving unit that receives signals from the first UE. In an embodiment, when the first UE periodically sends signals to the second UE (i.e., during SPS transmission), the receiving unit does not receive sidelink buffer status report (BSR) messages or sidelink scheduling requests (SRs) from the first UE.

[0066] Figure 3 A flowchart illustrating a wireless communication method 300 performed by an eNB (e.g., eNB 200) according to an embodiment of this disclosure is shown. The wireless communication method 300 may include: step 301, filling an SPS activation / deactivation field in a DCI with a predetermined bit pattern; and step 302, transmitting the DCI to a first UE for the first UE to begin or cease periodically transmitting signals to a second UE based on the SPS activation / deactivation field, wherein the DCI is in an SPS format formed by employing some or all bits of at least one field of DCI format 5 as the SPS activation / deactivation field, and indicating, with the aid of or via RRC or MAC signaling, information to be transmitted in said at least one field. The details and benefits described above regarding eNB 200 may also be applied to the wireless communication method 300.

[0067] Accordingly, embodiments of this disclosure provide a UE as a transmitting UE and a wireless communication method performed by the transmitting UE.

[0068] Figure 4 A block diagram of a UE 400 as a transmitting UE according to an embodiment of this disclosure is illustrated schematically. UE 400 may include: a receiving unit 401 that receives a DCI transmitted from an eNB; and a transmitting unit 402 that starts periodically transmitting signals to another UE (receiving UE) or stops periodically transmitting signals to said other UE based on an SPS activation / deactivation field in the DCI, wherein the DCI is in an SPS format formed by using some or all bits of at least one field of DCI format 5 as an SPS activation / deactivation field, and the information to be transmitted in said at least one field is indicated with the aid of RRC or MAC signaling or by means of RRC or MAC signaling. Optionally, when periodically transmitting signals to the receiving UE, the transmitting unit 402 does not transmit a sidelink BSR message or a sidelink SR to the eNB.

[0069] The UE 400 according to this disclosure may optionally include: a CPU (Central Processing Unit) 410 for executing programs to process various data and control the operation of various units in the UE 400; a ROM (Read-Only Memory) 413 for storing various programs required for executing various processes and controls performed by the CPU 410; a RAM (Random Access Memory) 415 for storing intermediate data temporarily generated during the processing and control performed by the CPU 410; and / or a storage unit 417 for storing various programs, data, etc. The aforementioned receiving unit 401, transmitting unit 402, CPU 410, ROM 413, RAM 415, and / or storage unit 417 may be interconnected via a data and / or command bus 420 and transmit signals between each other.

[0070] The aforementioned components are not intended to limit the scope of this disclosure. According to one implementation of this disclosure, the functions of the receiving unit 401 and the transmitting unit 402 can be implemented in hardware, and the CPU 410, ROM 413, RAM 415, and / or storage unit 417 may not be necessary. Alternatively, the functions of the receiving unit 401 and the transmitting unit 402 can also be implemented in software in combination with the aforementioned CPU 410, ROM 413, RAM 415, and / or storage unit 417.

[0071] Figure 5A flowchart illustrating a wireless communication method 500 performed by a UE (e.g., transmitting UE 400) according to an embodiment of this disclosure is shown. The wireless communication method 500 may include: step 501, receiving a DCI transmitted from an eNB; and step 502, starting or stopping periodically transmitting signals to another UE (receiving UE) based on an SPS activation / deactivation field in the DCI, wherein the DCI is in an SPS format formed by using some or all bits of at least one field of DCI format 5 as an SPS activation / deactivation field, and the information to be transmitted in the at least one field is indicated by RRC or MAC signaling, or by RRC or MAC signaling.

[0072] Note that the details and benefits described above regarding the eNB side can also be applied to the UE side, unless the context otherwise indicates.

[0073] In another embodiment, SPS activation / deactivation can be triggered solely by the RNTI, and there are no special fields for SPS activation / deactivation. For example, SPS RNTI 1 is used for SPS activation, SPS RNTI 2 is used for SPS deactivation, and another RNTI is used for non-SPS transmission (a single transmission). Therefore, the UE receiving the DCI can determine whether to activate SPS transmission, deactivate SPS transmission, or perform a single transmission based on the RNTI that scrambles the CRC of the DCI.

[0074] Accordingly, Figure 6 A flowchart illustrating a wireless communication method 600 performed by an eNB according to an embodiment of this disclosure is shown. The wireless communication method 600 may include: step 601, scrambling the CRC of the DCI with an RNTI; and step 602, sending the DCI to a first UE so that the first UE determines, based solely on the RNTI, whether to send a signal to a second UE once, to begin periodically sending signals to the second UE, or to stop periodically sending signals to the second UE, wherein the DCI is in DCI format 5. In this embodiment, the first UE (transmitting UE) can determine, based solely on the RNTI that has already been used to scramble the CRC of the DCI, whether to perform a single transmission, activate SPS transmission, or deactivate SPS transmission, without modifying the DCI format. Therefore, the same DCI format can be used for both SPS and non-SPS transmissions.

[0075] This disclosure also provides an eNB for performing the above method 600, comprising: a circuit that scrambles the CRC of the DCI with RNTI; and a transmitting unit that transmits the DCI to a first UE, so that the first UE determines, based solely on the RNTI, whether to send a signal to a second UE once, to begin periodically sending signals to the second UE, or to stop periodically sending signals to the second UE, wherein the DCI is in DCI format 5. A block diagram of the eNB in ​​this embodiment can be referred to... Figure 2 The structure shown.

[0076] Figure 7 A flowchart illustrating a wireless communication method 700 performed by a UE according to an embodiment of the present disclosure is shown. The wireless communication method 700 may include: step 701, receiving a DCI transmitted from an eNB; and step 702, determining, based solely on an RNTI scrambled with the CRC of the DCI, whether to transmit a signal to another UE once, to begin periodically transmitting a signal to the other UE, or to stop periodically transmitting a signal to the other UE, wherein the DCI is in DCI format 5.

[0077] This disclosure also provides a UE for performing the above method 700, comprising: a receiving unit that receives a DCI transmitted from an eNB; and circuitry that determines, based solely on the RNTI scrambled with the CRC of the DCI, whether to send a signal to another UE once, begin periodically sending signals to the other UE, or stop periodically sending signals to the other UE, wherein the DCI is in DCI format 5. Except that the transmitting unit 402 is replaced by the circuitry described above, the block diagram of the UE in this embodiment can be referred to... Figure 4 The structure shown.

[0078] In another embodiment, to ensure that the size of DCI format 0 / 1A is the same as the size of the modified DCI format 5, a new field for SPS activation / deactivation can be added to DCI format 5 when V2X or D2D SPS is enabled; and DCI format 0 / 1A also has the added new field, or all legacy fields in DCI format 0 / 1A are automatically enabled regardless of FDD / TDD, downlink / uplink, CA / non-CA (carrier aggregation), such as the "CFI" field (3 bits) regardless of CA or non-CA, the "UL index" field (2 bits) regardless of FDD or TDD, and the "downlink dispatch index" (2 bits) regardless of FDD or TDD. If the size of DCI format 0 / 1A is still not large enough to align with the modified DCI format 5, padding bits can be added. In this way, the sizes of the modified DCI format 5 and DCI format 0 / 1A can remain the same, which will not increase blind decoding time.

[0079] Accordingly, Figure 8 A flowchart illustrating a wireless communication method 800 performed by an eNB according to an embodiment of this disclosure is shown. The wireless communication method 800 may include: step 801, filling an SPS activation / deactivation field in a first DCI with a predetermined bit pattern; step 802, sending the first DCI to a first UE for the first UE to transmit a signal to a second UE once, to begin periodically transmitting a signal to the second UE, or to stop periodically transmitting a signal to the second UE based on the SPS activation / deactivation field, wherein the first DCI is in a format formed by additionally adding the SPS activation / deactivation field to DCI format 5; and step 803, sending a second DCI to the first UE for the first UE to transmit a signal to the eNB, wherein the second DCI is in DCI format 0 / 1A where all conventional fields are enabled, or in a format formed by additionally adding fields identical to those added to DCI format 5 to DCI format 0 / 1A, such that the size of the first DCI is the same as the size of the second DCI. Note that the steps in method 800 are not necessarily performed in the order indicated above. For example, step 803 can be performed before steps 801 and 802.

[0080] In method 800, the first DCI is in a modified DCI format 5, which is used for D2D or V2X, by adding an SPS activation / deactivation field. The SPS activation / deactivation field in the modified DCI format 5 indicates whether the first UE (transmitting UE) should perform a transmission to the second UE (receiving UE), start an SPS transmission to the second UE, or stop an SPS transmission to the second UE. The second DCI is used for traditional wireless communication (i.e., communication between the eNB and the UE) and is in a modified DCI format 0 / 1A, which is used by adding the same field as the SPS activation / deactivation field added to DCI format 5, or in the original DCI format 0 / 1A, where all traditional fields are enabled, such that the first DCI and the second DCI have the same size.

[0081] Table 6 shows the addition of a new field for SPS activation / deactivation in both DCI format 0 / 1A and DCI format 5. In this way, DCI format 0 / 1A retains the same size as DCI format 5.

[0082] Table 6

[0083]

[0084]

[0085] Table 7 illustrates how to maximize the size of DCI format 0 / 1A by enabling all fields, regardless of FDD / TDD, downlink / uplink, and CA / non-CA, and by adding new fields in DCI format 5. In this way, two DCIs can also maintain the same size, thus not increasing blind decoding time.

[0086] Table 7

[0087]

[0088]

[0089] This disclosure also provides an eNB for performing the above method 800, comprising: circuitry that fills the SPS activation / deactivation field in a first DCI with a predetermined bit pattern; and a transmission unit that transmits the first DCI to a first UE for the first UE to transmit a signal to a second UE once, to begin periodically transmitting a signal to the second UE, or to stop periodically transmitting a signal to the second UE based on the SPS activation / deactivation field, wherein the first DCI is in a format formed by additionally adding the SPS activation / deactivation field to DCI format 5; the transmission unit also transmits a second DCI to the first UE for the first UE to transmit a signal to the eNB; and the second DCI is in DCI format 0 / 1A where all conventional fields are enabled or in a format formed by additionally adding fields identical to those added to DCI format 5 to DCI format 0 / 1A, such that the size of the first DCI is the same as the size of the second DCI. A block diagram of the eNB in ​​this embodiment can be referred to. Figure 2 The structure shown.

[0090] Regarding the transmitting UE side Figure 9 A flowchart illustrating a wireless communication method 900 performed by a UE according to an embodiment of the present disclosure is shown. The wireless communication method 900 may include: step 901, receiving a first DCI transmitted from an eNB; step 902, transmitting a signal once to another UE based on an SPS activation / deactivation field in the first DCI, starting to periodically transmit signals to the other UE, or stopping periodically transmitting signals to the other UE, wherein the first DCI is in a format formed by additionally adding an SPS activation / deactivation field to DCI format 5; and step 903, receiving a second DCI from the eNB for a transmitting unit to transmit a signal to the eNB, wherein the second DCI is in DCI format 0 / 1A where all conventional fields are enabled, or in a format formed by additionally adding fields identical to those added to DCI format 5 to DCI format 0 / 1A, such that the size of the first DCI is the same as the size of the second DCI.

[0091] This disclosure also provides a UE for performing the above method 900, comprising: a receiving unit that receives a first DCI transmitted from an eNB; and a transmitting unit that transmits a signal to another UE once, starts periodically transmitting the signal to the other UE, or stops periodically transmitting the signal to the other UE based on the SPS activation / deactivation field in the first DCI, wherein the first DCI is in a format formed by additionally adding the SPS activation / deactivation field to DCI format 5; the receiving unit also receives a second DCI transmitted from the eNB for the transmitting unit to transmit the signal to the eNB; and the second DCI is in DCI format 0 / 1A where all conventional fields are enabled or in a format formed by additionally adding fields identical to those added to DCI format 5 to DCI format 0 / 1A, such that the size of the first DCI is the same as the size of the second DCI. A block diagram of the UE in this embodiment can be referred to. Figure 4 The structure shown.

[0092] This disclosure can be implemented by software, hardware, or software cooperating with hardware. Each functional block used in the description of each of the above embodiments can be implemented by an LSI as an integrated circuit, and each process described in each embodiment can be controlled by an LSI. They can be individually constructed as chips, or a single chip can be formed to include some or all of the functional blocks. They can include data inputs and outputs coupled thereto. Depending on the degree of integration, the LSI herein may be referred to as an IC, a system LSI, a super LSI, or an ultra-LSI. However, the technology for implementing integrated circuits is not limited to LSIs and can be implemented using dedicated circuits or general-purpose processors. Furthermore, FPGAs (Field-Programmable Gate Arrays) that can be programmed after the LSI is manufactured, or reconfigurable processors that can reconfigure the connections and settings of the circuit cells deployed within the LSI, can be used.

[0093] Note that this disclosure is intended to be varied and modified by those skilled in the art based on the descriptions and known techniques presented in the specification, without departing from its scope and content, and such changes and applications fall within the scope of the claims. Furthermore, the constituent elements of the above embodiments can be combined arbitrarily without departing from the scope of this disclosure.

[0094] This disclosure may provide at least the following subject matter.

[0095] 1. An eNode B (eNB), comprising:

[0096] The circuit, which fills the semi-static scheduling (SPS) activation / deactivation field in the downlink control information (DCI) with a predetermined bit pattern; and

[0097] The transmitting unit sends the DCI to a first user equipment (UE) for the first UE to start or stop periodically transmitting signals to the second UE based on the SPS activation / deactivation field.

[0098] The DCI is in an SPS format formed by using some or all bits of at least one field of DCI format 5 as the SPS activation / deactivation field, and the information to be transmitted in the at least one field is indicated by the aid of Radio Resource Control (RRC) or Media Access Control (MAC) signaling or by RRC or MAC signaling.

[0099] 2. eNode B as described in 1,

[0100] All bits of all fields in the DCI format 5 are used as the SPS activation / deactivation fields; and

[0101] The Radio Network Temporary Identifier (RNTI) used to scramble the Cyclic Redundancy Check (CRC) of the DCI in the SPS format is the same as the RNTI used to scramble the CRC of the DCI in the DCI format 5.

[0102] 3. The eNode B as described in 1 or 2 further includes:

[0103] The receiving unit receives signals from the first UE. When the first UE periodically sends signals to the second UE, the receiving unit does not receive sidelink buffer status report (BSR) messages or sidelink scheduling requests (SR) from the first UE.

[0104] 4. An eNode B (eNB), comprising:

[0105] The circuit scrambles the cyclic redundancy check (CRC) of the downlink control information (DCI) with the radio network temporary identifier (RNTI); and

[0106] The transmitting unit transmits the DCI to a first user equipment (UE) so that the first UE can determine, based solely on the RNTI, whether to transmit a signal to the second UE once, begin periodically transmitting signals to the second UE, or stop periodically transmitting signals to the second UE.

[0107] The DCI is in DCI format 5.

[0108] 5. An eNode B (eNB), comprising:

[0109] Circuitry that fills the semi-static scheduling (SPS) activation / deactivation field in the first downlink control information (DCI) with a predetermined bit pattern; and

[0110] The transmitting unit transmits the first DCI to the first user equipment (UE) for the first UE to send a signal to the second UE once, to start periodically sending signals to the second UE, or to stop periodically sending signals to the second UE based on the SPS activation / deactivation field.

[0111] The first DCI is in a format formed by additionally adding the SPS activation / deactivation field to DCI format 5;

[0112] The transmitting unit also transmits a second DCI to the first UE for the first UE to transmit a signal to the eNB; and

[0113] The second DCI is in DCI format 0 / 1A where all conventional fields are enabled, or in a format formed by additionally adding the same fields as those added to DCI format 5 to DCI format 0 / 1A, such that the size of the first DCI is the same as the size of the second DCI.

[0114] 6. A user equipment (UE), comprising:

[0115] The receiving unit receives downlink control information (DCI) sent from the eNode B (eNB);

[0116] The transmitting unit, based on the SPS activation / deactivation field in the DCI, starts or stops periodically transmitting signals to another UE.

[0117] The DCI is in an SPS format formed by using some or all bits of at least one field of DCI format 5 as the SPS activation / deactivation field, and the information to be transmitted in the at least one field is indicated by the aid of Radio Resource Control (RRC) or Media Access Control (MAC) signaling or by RRC or MAC signaling.

[0118] 7. The user equipment as described in 6,

[0119] All bits of all fields in the DCI format 5 are used as the SPS activation / deactivation fields; and

[0120] The Radio Network Temporary Identifier (RNTI) used to scramble the Cyclic Redundancy Check (CRC) of the DCI in the SPS format is the same as the RNTI used to scramble the CRC of the DCI in the DCI format 5.

[0121] 8. The user equipment as described in 6 or 7,

[0122] When periodically sending signals to the other UE, the transmitting unit does not send a sidelink buffer status report (BSR) message or a sidelink scheduling request (SR) to the eNB.

[0123] 9. A user equipment (UE), comprising:

[0124] The receiving unit receives downlink control information (DCI) transmitted from the eNode B (eNB); and

[0125] The circuit determines, based solely on the Radio Network Temporary Identifier (RNTI) scrambled with the Cyclic Redundancy Check (CRC) of the DCI, whether to send a signal to another UE once, start periodically sending signals to the other UE, or stop periodically sending signals to the other UE.

[0126] The DCI is in DCI format 5.

[0127] 10. A user equipment (UE), comprising:

[0128] The receiving unit receives the first downlink control information (DCI) transmitted from the eNode B (eNB); and

[0129] The transmitting unit, based on the SPS activation / deactivation field in the first DCI, sends a signal to another UE once, starts periodically sending signals to the other UE, or stops periodically sending signals to the other UE.

[0130] The first DCI is in a format formed by additionally adding the SPS activation / deactivation field to DCI format 5;

[0131] The receiving unit also receives a second DCI transmitted from the eNB for use by the transmitting unit to transmit a signal to the eNB; and

[0132] The second DCI is in DCI format 0 / 1A where all conventional fields are enabled, or in a format formed by additionally adding the same fields as those added to DCI format 5 to DCI format 0 / 1A, such that the size of the first DCI is the same as the size of the second DCI.

[0133] 11. A wireless communication method performed by an eNode B (eNB), comprising:

[0134] The semi-static scheduling (SPS) activation / deactivation field in the downlink control information (DCI) is filled with a predetermined bit pattern; and

[0135] The DCI is sent to the first user equipment (UE) so that the first UE can start or stop periodically sending signals to the second UE based on the SPS activation / deactivation field.

[0136] The DCI is in an SPS format formed by using some or all bits of at least one field of DCI format 5 as the SPS activation / deactivation field, and the information to be transmitted in the at least one field is indicated by the aid of Radio Resource Control (RRC) or Media Access Control (MAC) signaling or by RRC or MAC signaling.

[0137] 12. The wireless communication method as described in 11,

[0138] All bits of all fields in the DCI format 5 are used as the SPS activation / deactivation fields; and

[0139] The Radio Network Temporary Identifier (RNTI) used to scramble the Cyclic Redundancy Check (CRC) of the DCI in the SPS format is the same as the RNTI used to scramble the CRC of the DCI in the DCI format 5.

[0140] 13. A wireless communication method performed by an eNode B (eNB), comprising:

[0141] The cyclic redundancy check (CRC) of the downlink control information (DCI) is scrambled using the Radio Network Temporary Identifier (RNTI); and

[0142] The DCI is sent to the first user equipment (UE) so that the first UE can determine, based solely on the RNTI, whether to send a signal to the second UE once, start periodically sending signals to the second UE, or stop periodically sending signals to the second UE.

[0143] The DCI is in DCI format 5.

[0144] 14. A wireless communication method performed by an eNode B (eNB), comprising:

[0145] The semi-static scheduling (SPS) activation / deactivation field in the first downlink control information (DCI) is filled with a predetermined bit pattern;

[0146] The first DCI is sent to the first user equipment (UE) for the first UE to send a signal to the second UE once, to start periodically sending a signal to the second UE, or to stop periodically sending a signal to the second UE based on the SPS activation / deactivation field, wherein the first DCI is in a format formed by additionally adding the SPS activation / deactivation field to DCI format 5; and

[0147] The second DCI is sent to the first UE for the first UE to send a signal to the eNB. The second DCI is in DCI format 0 / 1A in which all conventional fields are enabled or in a format formed by additionally adding the same fields as those added to DCI format 5 to DCI format 0 / 1A, such that the size of the first DCI is the same as the size of the second DCI.

[0148] 15. A wireless communication method performed by a user equipment (UE), comprising:

[0149] Receive downlink control information (DCI) sent from eNode B (eNB);

[0150] Based on the SPS activation / deactivation field in the DCI, periodically sending signals to another UE can begin or cease.

[0151] The DCI is in an SPS format formed by using some or all bits of at least one field of DCI format 5 as the SPS activation / deactivation field, and the information to be transmitted in the at least one field is indicated by the aid of Radio Resource Control (RRC) or Media Access Control (MAC) signaling or by RRC or MAC signaling.

[0152] 16. The wireless communication method as described in 15,

[0153] All bits of all fields in the DCI format 5 are used as the SPS activation / deactivation fields; and

[0154] The Radio Network Temporary Identifier (RNTI) used to scramble the Cyclic Redundancy Check (CRC) of the DCI in the SPS format is the same as the RNTI used to scramble the CRC of the DCI in the DCI format 5.

[0155] 17. A wireless communication method performed by a user equipment (UE), comprising:

[0156] Receive downlink control information (DCI) from eNode B (eNB); and

[0157] Based solely on the Radio Network Temporary Identifier (RNTI) scrambled with the Cyclic Redundancy Check (CRC) of the DCI, it is determined whether to send a signal to another UE once, start periodically sending signals to the other UE, or stop periodically sending signals to the other UE;

[0158] The DCI is in DCI format 5.

[0159] 18. A wireless communication method performed by a user equipment (UE), comprising:

[0160] Receive the first downlink control information (DCI) sent from the eNode B (eNB);

[0161] Based on the SPS activation / deactivation field in the first DCI, the first DCI sends a signal to another UE once, starts periodically sending signals to the other UE, or stops periodically sending signals to the other UE. The first DCI is in a format formed by additionally adding the SPS activation / deactivation field to DCI format 5.

[0162] The second DCI is received from the eNB for the transmitting unit to transmit a signal to the eNB. The second DCI is in DCI format 0 / 1A in which all conventional fields are enabled, or in a format formed by additionally adding the same fields as those added to DCI format 5 to DCI format 0 / 1A, such that the size of the first DCI is the same as the size of the second DCI.

[0163] Furthermore, embodiments of this disclosure may also provide an integrated circuit including modules for performing the steps of the various communication methods described above. Additionally, embodiments of this disclosure may also provide a computer-readable storage medium having a computer program containing program code stored thereon, which, when executed on a computing device, performs the steps of the various communication methods described above.

Claims

1. A first communication device, comprising: The receiving unit receives first downlink control information (DCI) from the second communication device during operation. The first DCI includes activation / release fields for activating / releasing semi-persistent scheduling (SPS), excluding all fields of the third DCI. The third DCI is used for sidelink non-SPS transmission. The first DCI is scrambled using an RNTI different from the third DCI, where the RNTI indicates whether it is an SPS. The first DCI is set to have the same size as the second DCI by using padding bits; The second DCI is used for communication between the first communication device and the second communication device. The sending unit, in operation, sends semi-persistent scheduling data to the third communication device or terminates semi-persistent scheduling data to the third communication device based on the activation / release field of the first DCI.

2. The first communication device according to claim 1, wherein, The second DCI does not include the activation / release field.

3. The first communication device according to claim 1, wherein, The first DCI, including the activation / release field, is used for SPS communication between the first communication device and the third communication device.

4. The first communication device according to claim 1, wherein, The second DCI and the third DCI are set to have the same size by using padding bits.

5. The first communication device according to claim 1, wherein, The first DCI and the third DCI are generated using the first DCI format, and the second DCI is generated using the second DCI format.

6. The first communication device according to claim 1, wherein, The Cyclic Redundancy Check (CRC) of the first DCI is scrambled using the SPS-specific Radio Network Temporary Identifier (RNTI) used for the first DCI.

7. The first communication device according to claim 1, wherein, The first DCI includes a time resource field, which indicates a subset of time resources determined by RRC signaling.

8. The first communication device according to claim 1, wherein, The first DCI format is used for side link communication between the first communication device and the third communication device.

9. A first communication method for a first communication device, comprising: Receive first downlink control information (DCI) from the second communication device. The first DCI includes activation / release fields for activating / releasing semi-persistent scheduling (SPS), excluding all fields of the third DCI. The third DCI is used for sidelink non-SPS transmission. The first DCI is scrambled using an RNTI different from the third DCI, where the RNTI indicates whether it is an SPS. The first DCI is set to have the same size as the second DCI by using padding bits; The second DCI is used for communication between the first communication device and the second communication device. The semi-persistent scheduling data is sent to the third communication device or terminated to the third communication device based on the activation / release field of the first DCI.

10. The first communication method according to claim 9, wherein, The second DCI does not include the activation / release field.

11. The first communication method according to claim 9, wherein, The first DCI, including the activation / release field, is used for SPS communication between the first communication device and the third communication device.

12. The first communication method according to claim 9, wherein, The second DCI and the third DCI are set to have the same size by using padding bits.

13. The first communication method according to claim 9, wherein, The first DCI and the third DCI are generated using the first DCI format, and the second DCI is generated using the second DCI format.

14. The first communication method according to claim 9, wherein, The Cyclic Redundancy Check (CRC) of the first DCI is scrambled using the SPS-specific Radio Network Temporary Identifier (RNTI) used for the first DCI.

15. The first communication method according to claim 9, wherein, The first DCI includes a time resource field, which indicates a subset of time resources determined by RRC signaling.

16. The first communication method according to claim 9, wherein, The first DCI format is used for side link communication between the first communication device and the third communication device.

17. A second communication device, comprising: The generation unit generates the first downlink control information (DCI) during operation. The first DCI includes an activation / release field for activating / releasing semi-persistent scheduling (SPS), in addition to all fields of the third DCI. This activation / release field indicates the start or termination of semi-persistent scheduling data to the third communication device. The third DCI is used for sidelink non-SPS transmission. The first DCI is scrambled using an RNTI different from the third DCI, where the RNTI indicates whether it is an SPS. The first DCI is set to have the same size as the second DCI by using padding bits; The second DCI is used for communication between the first communication device and the second communication device. The transmitting unit transmits the first DCI to the first communication device during operation.

18. The second communication device according to claim 17, wherein, The second DCI does not include the activation / release field.

19. The second communication device according to claim 17, wherein, The first DCI, including the activation / release field, is used for SPS communication between the first communication device and the third communication device.

20. The second communication device according to claim 17, wherein, The second DCI and the third DCI are set to have the same size by using padding bits.

21. The second communication device according to claim 17, wherein, The first DCI and the third DCI are generated using the first DCI format, and the second DCI is generated using the second DCI format.

22. The second communication device according to claim 17, wherein, The Cyclic Redundancy Check (CRC) of the first DCI is scrambled using the SPS-specific Radio Network Temporary Identifier (RNTI) used for the first DCI.

23. The second communication device according to claim 17, wherein, The first DCI includes a time resource field, which indicates a subset of time resources determined by RRC signaling.

24. The second communication device according to claim 17, wherein, The first DCI format is used for side link communication between the first communication device and the third communication device.

25. A second communication method for a second communication device, comprising: Generate the first downlink control information (DCI). The first DCI includes an activation / release field for activating / releasing semi-persistent scheduling (SPS), in addition to all fields of the third DCI. This activation / release field indicates the start or termination of semi-persistent scheduling data to the third communication device. The third DCI is used for sidelink non-SPS transmission. The first DCI is scrambled using an RNTI different from the third DCI, where the RNTI indicates whether it is an SPS. The first DCI is set to have the same size as the second DCI by using padding bits; The second DCI is used for communication between the first communication device and the second communication device. The first DCI is sent to the first communication device.

26. The second communication method according to claim 25, wherein, The second DCI does not include the activation / release field.

27. The second communication method according to claim 25, wherein, The first DCI, including the activation / release field, is used for SPS communication between the first communication device and the third communication device.

28. The second communication method according to claim 25, wherein, The second DCI and the third DCI are set to have the same size by using padding bits.

29. The second communication method according to claim 25, wherein the first DCI and the third DCI are generated in a first DCI format, and the second DCI is generated in a second DCI format.

30. The second communication method according to claim 25, wherein, The Cyclic Redundancy Check (CRC) of the first DCI is scrambled using the SPS-specific Radio Network Temporary Identifier (RNTI) used for the first DCI.

31. The second communication method according to claim 25, wherein, The first DCI includes a time resource field, which indicates a subset of time resources determined by RRC signaling.

32. The second communication method according to claim 25, wherein, The first DCI format is used for side link communication between the first communication device and the third communication device.

33. An integrated circuit for a first communication device, comprising: The circuit, which controls the operation: Receive first downlink control information (DCI) from the second communication device. The first DCI includes activation / release fields for activating / releasing semi-persistent scheduling (SPS), excluding all fields of the third DCI. The third DCI is used for sidelink non-SPS transmission. The first DCI is scrambled using an RNTI different from the third DCI, where the RNTI indicates whether it is an SPS. The first DCI is set to have the same size as the second DCI by using padding bits; The second DCI is used for communication between the first communication device and the second communication device. The semi-persistent scheduling data is sent to the third communication device or terminated to the third communication device based on the activation / release field of the first DCI.

34. An integrated circuit for a second communication device, comprising: The circuit, which controls the operation: Generate the first downlink control information (DCI). The first DCI includes an activation / release field for activating / releasing semi-persistent scheduling (SPS), in addition to all fields of the third DCI. This activation / release field indicates the start or termination of semi-persistent scheduling data to the third communication device. The third DCI is used for sidelink non-SPS transmission. The first DCI is scrambled using an RNTI different from the third DCI, where the RNTI indicates whether it is an SPS. The first DCI is set to have the same size as the second DCI by using padding bits; The second DCI is used for communication between the first communication device and the second communication device. The first DCI is sent to the first communication device.

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