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    • 专利摘要:
    The present disclosure provides a method executed by user equipment, the method comprising: receiving downlink control information (DCI), the DCI comprising a repetition number; determining a number of subframes required to transmit a physical uplink shared channel (PUSCH) (N) according to the repetition number, a number of allocated resource units, and time occupied by each resource unit; and transmitting the PUSCH in the determined N subframes. The time occupied by each resource unit is expressed by: a number of uplink slots occupied by each resource unit, or a number of uplink subframes occupied by each resource unit. In addition, the present disclosure further provides corresponding user equipment and a base station.
    公开号:EP3691375A1
    申请号:EP18862411.8
    申请日:2018-09-20
    公开日:2020-08-05
    发明作者:Chao LUO；Renmao Liu
    申请人:Sharp Corp；
    IPC主号:H04W72-00
    专利说明:
    [0001] The present disclosure relates to the technical field of wireless communication, and specifically to a method executed by user equipment, a method executed by a base station, and corresponding user equipment and base station. Background
    [0002] At the 3rd Generation Partnership Program (3GPP) RAN#75 plenary meeting held in March 2017, a new work item on even further enhancement of Machine Type Communication (MTC) (see non-patent literature: RP-170732: New WID on Even further enhanced MTC for LTE) was approved. One of the goals of the work item is to support resource allocation based on sub-physical resource blocks (sub-PRBs) (that is, support resource allocation based on less than one PRB) so as to improve the spectral efficiency of an MTC physical uplink shared channel.
    [0003] In the existing 3GPP standard specifications on MTC, MTC UE in an RRC connected state supports two coverage enhancement modes: CE mode A and CE mode B. The coverage enhancement mode A is used for UE having good channel conditions, wherein no coverage enhancement or only small coverage enhancement is required; or in other words, no repeated transmission or only a lower number of repeated transmissions are required; the coverage enhancement mode B is used for UE having poor channel conditions, wherein a great or greater coverage enhancement is required; in other words, a greater number of repeated transmissions are required.
    [0004] A base station (also referred to as an eNB) expands the coverage of a PUSCH by repetitions. Specifically, the eNB configures a maximum number of repetitions for PUSCH (pusch-maxNumRepetitionCEmodeB) through RRC signaling, and a corresponding set of repetitions for PUSCH is defined for each configurable maximum number of repetitions. For UEs in the coverage enhancement mode A, one set of repetitions for PUSCH contains four values, whereas for UEs in the coverage enhancement mode B, one set of repetitions for PUSCH contains eight values. The definition of the aforementioned sets is as shown in the following Table 8-2c of TS 36.213: Higher-layer Parameter 'pusch-maxNumRepetition CEmodeB' {n1,n2,...,n8} Unconfigured {4, 8, 16, 32, 64, 128, 256, 512} 192 {1, 4, 8, 16, 32, 64, 128, 192} 256 {4, 8, 16, 32, 64, 128, 192, 256} 384 {4, 16, 32, 64, 128, 192, 256, 384} 512 {4, 16, 64, 128, 192, 256, 384, 512} 768 {8, 32, 128, 192, 256, 384, 512, 768} 1024 {4, 8, 16, 64, 128, 256, 512, 1024} 1536 {4, 16, 64, 256, 512, 768, 1024, 1536} 2048 {4, 16, 64, 128, 256, 512, 1024, 2048}
    [0005] UE receives RRC signaling from the eNB so as to obtain the maximum number of repetitions for PUSCH (pusch-maxNumRepetitionCEmodeB), from which the set of repetitions for PUSCH can be known: {n 1, n 2, ..., n max} (For coverage enhancement mode B, the size of the set is 8, i.e., nmax = n8), that is, a line in the table above.
    [0006] The uplink data transmission of the UE is scheduled by the downlink control information (DCI) sent by the eNB. A 3-bit repetition number indication field in the DCI is used to indicate the number of repetitions for PUSCH adopted for the corresponding PUSCH transmission.
    [0007] In the existing 3GPP standard specifications for MTC, the smallest resource allocation unit of PUSCH is one Physical Resource Block (PRB), i.e., a bandwidth occupying 12 subcarriers in the frequency domain. The subcarrier spacing in the existing LTE specifications is 15 kHz, and the physical bandwidth of one PRB is 180 kHz. When the UE has poor channel conditions, methods to achieve the desired reception quality for a PUSCH include increasing the transmit power of the UE or increasing the number of repetitions for PUSCH. However, the UE has a limit of the transmit power, or has a maximum transmit power. For a MTC UE having poor channel conditions or poor coverage, the legacy LTE system already uses the maximum power for transmission. According to the research, for UEs with poor coverage, decreasing the bandwidth of resource allocation (e.g., the granularity of resource allocation is changed from 12 subcarriers to 6 subcarriers, or even 3 subcarriers or 1 subcarrier) and increasing the power per unit of frequency can effectively improve PUSCH link performance and improve uplink spectrum efficiency. This method is known as "sub-PRB" resource allocation.
    [0008] After performing sub-PRB resource allocation, it is necessary to enhance the repetition number indication field in the DCI so as to support finer grained resource allocation. Summary
    [0009] In order to solve the above problem, the present disclosure provides a method executed by user equipment, the method comprising: receiving downlink control information (DCI), the DCI comprising a repetition number; determining a number of subframes required to transmit a physical uplink shared channel (PUSCH) (N) according to the repetition number, a number of allocated resource units NRU, and time occupied by each resource unitN t UL ;
    [0010] In one embodiment, the number of subframes required N is determined according to the following: acquiring a maximum repetition number; acquiring a parameter set corresponding to the maximum repetition number; finding a corresponding parameter n from the parameter set based on the repetition number; and calculating the number of subframes required N based on the found parameter n, the number of allocated resource units NRU and the time occupied by each resource unitN t UL .
    [0011] In one embodiment, the number of subframes required N is determined according to the following: finding a corresponding parameter n from the parameter set based on the repetition number; and calculating the number of subframes required N based on the found parameter n, the number of allocated resource units NRU, and the time occupied by each resource unitN t UL .
    [0012] In one embodiment, the step of calculating the number of subframes required N comprises: calculating the product of NRU andN slots UL
    [0013] In one embodiment, the step of calculating the number of subframes required N comprises: calculating the product of NRU andN SF UL
    [0014] In one embodiment, the step of calculating the number of subframes required N comprises: calculating the product of NRU andN slots UL
    [0015] In one embodiment, the step of calculating the number of subframes required N comprises: calculating the product of NRU andN slots UL
    [0016] In one embodiment, the step of calculating the number of subframes required N comprises: calculating the product of NRU andN slots UL
    [0017] In one embodiment, the step of calculating the number of subframes required N comprises: calculating the product of NRU andN slots UL
    [0018] In one embodiment, the step of calculating the number of subframes required N comprises: calculating the product of NRU andN SF UL
    [0019] In one embodiment, the step of calculating the number of subframes required N comprises: calculating the product of NRU andN slots UL
    [0020] In one embodiment, the step of calculating the number subframes required N comprises: calculating the product of NRU andN slots UL
    [0021] According to another aspect of the present disclosure, a method executed by a base station is provided, the method comprising: transmitting DCI to user equipment, the DCI comprising a repetition number; and receiving a Physical Uplink Shared Channel (PUSCH) transmitted on a specific number N of subframes from the user equipment, wherein the specific number N is determined according to the repetition number, a number of allocated resource units NRU and time occupied by each resource unitN t UL .
    [0022] According to another aspect of the present disclosure, user equipment is provided, comprising a processor and a memory. The memory stores instructions that, when run by the processor, cause the user equipment to execute the method executed by user equipment described above.
    [0023] According to another aspect of the present disclosure, a base station is provided, comprising a processor and a memory. The memory stores instructions that, when run by the processor, cause the base station to execute the method executed by base station described above. Description of the Drawings
    [0024] The above and other features of the present disclosure will become more apparent with the following detailed description in conjunction with the accompanying drawings.FIG. 1A is a flowchart of a method executed by the user equipment according to one embodiment of the present disclosure. FIG. 1B is a flowchart of a method executed by a base station according to one embodiment of the present disclosure. FIG. 2A is a block diagram of the user equipment according to one embodiment of the present disclosure. FIG. 2B is a block diagram of a base station according to one embodiment of the present disclosure. FIG. 3 is a schematic diagram of a resource allocation method based on PRB. FIG. 4 is a schematic diagram of a resource allocation method based on sub-PRB. Detailed Description
    [0025] The following describes the present disclosure in detail with reference to the accompanying drawings and specific embodiments. It should be noted that the present disclosure should not be limited to the specific embodiments described below. In addition, for simplicity, detailed description of the known art not directly related to the present disclosure is omitted to prevent confusion in understanding the present disclosure.
    [0026] FIG. 1A illustrates a flowchart of a method 10a executed by the user equipment according to one embodiment of the present disclosure.
    [0027] As illustrated in FIG. 1A, in step S110, DCI is received, wherein the DCI includes a repetition number. Alternatively, an indication of enabling a sub-PRB may be received from a base station through RRC signaling or DCI. If the indication of enabling the sub-PRB allocation mode is received from the base station through DCI, then the DCI may be the same DCI as the DCI including a repetition number.
    [0028] In step S120, the number of subframes required to transmit a physical uplink shared channel PUSCH (N) is determined according to the repetition number, a number of allocated resource units NRU, and time occupied by each resource unitN t UL .
    [0029] In the present disclosure, the time occupied by each resource unitN t UL
    [0030] In the present disclosure, UE may transmit a PUSCH in subframe n+ki, i=0, 1,..., N-1, where the subframe n is the last subframe of a Machine-type communication Physical Downlink Control Channel (MPDCCH) used for scheduling a PUSCH; the subframe n+k0 is the first subframe after the subframe n+x that can be used to transmit a PUSCH, and k0<k1<k2<...<kN-1 is a value associated with N subframes that can be used by the UE to transmit a PUSCH, where x is a constant.
    [0031] When the sub-PRB function is not enabled, N∈{n 1, n 2, ..., nmax }, the values of the 3-bit repetition number indication field in the DCI are: 0, 1,...,7, which respectively indicate one value in n 1, n 2 ,..., n max, where {n 1, n 2 ,..., n max} is a group of predefined values decided by a higher-layer parameter pusch-maxNumRepetitionCEmodeB. When the sub-PRB function is enabled, N∈{ n 1, n 2, ..., n max}, the values of the 3-bit repetition number indication field in the DCI are: 0, 1,...,7, which respectively indicate one value in n 1, n 2,..., n 8, wherein n 1, n 2,..., n max may adopt one of the following definitions: n ‾ i = ⌈ 2 ⋅ n i N RU ⋅ N slots UL⌉ ⋅N RU ⋅ N slots UL 2 , i = 1 , 2 ,…, 8 ,
    [0032] In all the aforementioned definitions, NRU represents the number of resource units allocated in the DCI;N slots UL
    [0033] Or, RU is defined asN SF UL
    [0034] FIG. 3 is a schematic diagram of a resource allocation method based on a PRB. As illustrated in FIG. 3, the granularity of resource allocation is one PRB (comprising 12 subcarriers, with a duration of 1 subframe, i.e., 2 slots). The base station may inform the UE of the following information in the DCI: Frequency domain dimension: one PRB is allocated starting from PRB 0. Time domain dimension: one subframe starting from subframe 4. In this case, the time is always one subframe. Repetition number: the allocated time-frequency resources, i.e., the contents transmitted on the subframe starting from subframe 4, are repeated eight times in the time domain (in order to facilitate identification, in the drawings different colors are used for repetition #1 and other repetitions). Obviously, 8 subframes (N = 8) in total are thus occupied. In the DCI, a special 3-bit field is used to describe the repetition number. In this example, the value indicated by this field in the DCI may be considered as a "subframe".
    [0035] FIG. 4 is a schematic diagram of a resource allocation method based on sub-PRB. In the resource allocation illustrated in FIG. 4, the base station may inform the UE of the following information in the DCI: Frequency domain dimension: three subcarriers allocated from subcarrier 3. That is, the RU definition with three subcarrier width is used, and since only one such definition (3 subcarriers × 8 slots) exists, at the same time, the "type" of RU is also implied here. Time domain dimension: two RUs allocated starting from subframe 4. It can also be seen from this that NRU is totally independent fromN SC RU
    [0036] As mentioned above, for resource allocation based on a PRB, a subframe is used as a unit. In the present disclosure, new rules for calculating N are defined such that the calculation of N is decoupled from the RU definition.
    [0037] Please refer to FIG. 1A again. In the step S130, the PUSCH is transmitted in the determined N subframes. That is, the PUSCH is transmitted in subframe n+ki, i=0, 1, ..., N-1.
    [0038] FIG. 1B is a flowchart of a method executed by a base station according to one embodiment of the present disclosure.
    [0039] As illustrated in FIG. 1B, in step S140, DCI is transmitted to the user equipment, the DCI including a repetition number.
    [0040] In step S150, a Physical Uplink Shared Channel (PUSCH) transmitted from the user equipment on a specific number N of subframes is received. As described above, the specific number N is determined according to the repetition number, the number of allocated resource units NRU, and the time occupied by each resource unitN t UL .
    [0041] FIG. 2A is a block diagram of the user equipment 20a according to one embodiment of the present disclosure. As illustrated in FIG. 2A, the user equipment 20a includes a processor 210a and a memory 220a. The processor 210a may, for example, include a microprocessor, a microcontroller, an embedded processor, or the like. The memory 220a may, for example, include a volatile memory (for example, a random access memory (RAM)), a hard disk drive (HDD), a non-volatile memory (for example, a flash memory), or other memories. The memory 220a stores program instructions. The instructions, when run by the processor 210a, can execute the aforementioned method executed by the user equipment (for example, the method illustrated in FIG. 1A) described in detail in the present disclosure.
    [0042] FIG. 2B is a block diagram of a base station 20b according to one embodiment of the present disclosure. As illustrated in FIG. 2B, the base station 20b includes a processor 210b and a memory 220b. The processor 210b may, for example, comprise a microprocessor, a microcontroller, an embedded processor, or the like. The memory 220b may, for example, comprise a volatile memory (for example, a random access memory (RAM)), a hard disk drive (HDD), a non-volatile memory (for example, a flash memory), or other memories. The memory 220b stores program instructions; the instructions, when run by the processor 210b, can execute the aforementioned method executed by a base station (for example, the method illustrated in FIG. 1B) described in detail in the present disclosure.
    [0043] The program running on the device according to the present disclosure may be a program that enables a computer to implement the functions of the embodiments of the present disclosure by controlling a Central Processing Unit (CPU). The program or information processed by the program can be stored temporarily in a volatile memory (for example, a random access memory (RAM)), a hard disk drive (HDD), a non-volatile memory (for example, a flash memory), or other memory systems.
    [0044] The program for implementing the functions of the embodiments of the present disclosure may be recorded on a computer-readable recording medium. The corresponding functions can be achieved by reading programs recorded on the recording medium and executing them by the computer system. The so-called "computer system" may be a computer system embedded in the device, which may include operating systems or hardware (for example, peripherals). The "computer-readable recording medium" may be a semiconductor recording medium, an optical recording medium, a magnetic recording medium, a recording medium for programs that are dynamically stored for a short time, or any other recording medium readable by a computer.
    [0045] Various features or functional modules of the device used in the above embodiments may be implemented or executed by circuits (for example, monolithic or multi-piece integrated circuits). Circuits designed to execute the functions described in the present specification may include general-purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs) or other programmable logic devices, discrete gates or transistor logic, or discrete hardware components, or any combination of the above. The general-purpose processor may be a microprocessor, or may be any existing processor, a controller, a microcontroller, or a state machine. The circuit may be a digital circuit or an analog circuit. When new integrated circuit technologies that replace existing integrated circuits emerge because of the advances in semiconductor technology, one or a plurality of embodiments of the present disclosure may also be implemented using these new integrated circuit technologies.
    [0046] Furthermore, the present disclosure is not limited to the embodiments described above. Although various examples of the described embodiments have been described, the present disclosure is not limited thereto. Fixed or non-mobile electronic devices installed indoors or outdoors, such as AV equipment, kitchen equipment, cleaning equipment, air conditioner, office equipment, vending machines, and other household appliances, may be used as terminal devices or communications devices.
    [0047] The embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings. However, the specific structures are not limited to the above embodiments. The present disclosure also includes any design modifications that do not depart from the substance of the present disclosure. In addition, various modifications can be made to the present disclosure within the scope of the claims. Embodiments resulted from the appropriate combinations of the technical means disclosed in different embodiments are also included within the technical scope of the present disclosure. In addition, components with the same effect described in the above embodiments may be replaced with one another.
    权利要求:
    Claims (10)
    [0001] A method executed by user equipment, the method comprising:
    receiving downlink control information (DCI), the DCI comprising a repetition number;
    determining a number of subframes required to transmit a physical uplink shared channel (PUSCH) (N) according to the repetition number, a number of allocated resource units NRU, and time occupied by each resource unitN t UL ;
    [0002] The method according to claim 1, wherein the number of subframes required N is determined according to the following:
    acquiring a maximum repetition number;
    acquiring a parameter set corresponding to the maximum repetition number;
    finding a corresponding parameter n from the parameter set based on the repetition number; and
    calculating the number of subframes required N based on the found parameter n, the number of allocated resource units NRU, and the time occupied by each resource unitN t UL .
    [0003] The method according to claim 2, wherein the step of calculating the number of subframes required N comprises:
    calculating the product of NRU andN slots UL
    [0004] The method according to claim 2, wherein the step of calculating the number of subframes required N comprises:
    calculating the product of NRU andN SF UL
    [0005] The method according to claim 2, wherein the step of calculating the number of subframes required N comprises:
    calculating the product of NRU andN slots UL
    [0006] The method according to claim 2, wherein the step of calculating the number of subframes required N comprises:
    calculating the product of NRU andN slots UL
    [0007] The method according to claim 2, wherein the step of calculating the number of subframes required N comprises:
    calculating the product of NRU andN SF UL
    [0008] A method executed by a base station, the method comprising:
    transmitting downlink control information (DCI) to user equipment, the DCI comprising a repetition number; and
    receiving a physical uplink shared channel (PUSCH) transmitted on a specific number N of subframes from the user equipment, wherein
    the specific number N is determined according to the repetition number, a number of allocated resource units NRU and time occupied by each resource unitN t UL ,
    [0009] User equipment, comprising:
    a processor; and
    a memory, the memory storing instructions, wherein
    the instructions, when run by the processor, cause the user equipment to execute the method according to any one of claims 1-7.
    [0010] A base station, comprising:
    a processor; and
    a memory, the memory storing instructions, wherein
    the instructions, when run by the processor, cause the base station to execute the method according to claim 8.
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