Terminal, base station, communication system, and communication method

Abstract

A terminal, a base station, a communication system and a communication method. A terminal is provided with: a reception unit that receives, from a base station, setting information for setting a reduced uplink bandwidth portion corresponding to an uplink bandwidth supported by the terminal; a control unit that sets the uplink bandwidth portion on the basis of the setting information; and a transmission unit that uses the set uplink bandwidth portion to transmit a message during random access to the base station.

Description

[0001] This application is a divisional application of the invention patent application with application date of February 13, 2020, application number 202080095756.2, and invention name “Terminal and Base Station”. Technical Field

[0002] The invention relates to a terminal and a base station in a wireless communication system. Background Art

[0003] In the standardization of the Third Generation Partnership Project (3GPP), a new type of device with lower cost and lower complexity than eMBB (enhanced Mobile Broadband) / URLLC (Ultra-Reliable and Low Latency Communications) devices is studied as Reduced Capability NR devices (sometimes also called NR-lightUE).

[0004] Reduced Capability NR devices (hereinafter referred to as Reduced Capability terminals 10) refer to devices whose performance is intermediate between eMBB / URLLC devices and LPWA (Low Power Wide Area, LTE-M / NB-IoT) devices.

[0005] Prior art literature

[0006] Non-patent literature

[0007] Non-patent document 1: 3GPP TS 38.211 V16.0.0 (2019-12) Summary of the invention

[0008] Problem that the invention aims to solve

[0009] As examples of functions of Reduced Capability terminals, UE Bandwidth reduction (a function that makes the bandwidth supported by the terminal narrower than the bandwidth supported by a typical NR device), Reduced number of UERX / TX antennas (a function that makes the number of antennas supported by the terminal less than the number of antennas supported by a typical NR device), Half-Duplex-FDD, Relaxed UP processing time, Relaxed UE processing capability, etc. are studied.

[0010] There is a need for a technology that enables a terminal to appropriately set a frequency bandwidth used for transmission or reception of the terminal so as to appropriately transmit a random access preamble even when the bandwidth supported by the terminal is reduced.

[0011] Means used to solve problems

[0012] According to one embodiment of the present invention, a terminal is provided, comprising: a control unit, which selects a sending timing for sending a random access preamble code, and sets a bandwidth for sending or receiving of the terminal based on a starting position of the bandwidth of the selected sending timing or a center position of the bandwidth of the selected sending timing, so that the random access preamble code can be sent in the bandwidth of the sending timing; and a sending unit, which sends the random access preamble code according to the bandwidth set by the control unit.

[0013] Effects of the Invention

[0014] According to the embodiment, a technique is provided for enabling the terminal to appropriately set a frequency bandwidth used for transmission or reception of the terminal, so as to appropriately transmit a random access preamble, even when the bandwidth supported by the terminal is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural diagram of the communication system in this embodiment.

[0016] Figure 2 2 is a diagram showing an example of a table that specifies the width of frequency resources of PRACH of NR.

[0017] Figure 3 It is a diagram showing an example of frequency division multiplexing of RACH occasions.

[0018] Figure 41 is a diagram showing an example of the relationship between the reduced bandwidth (Reduced bandwidth) of a Reduced Capability terminal and the positions of a plurality of frequency-division-multiplexed ROs.

[0019] Figure 5 1 is a diagram showing an example in which a Reduced Capability terminal sets a ULBWP according to the position of the frequency bandwidth of a selected RO.

[0020] Figure 6 1 is a diagram showing an example in which a Reduced Capability terminal sets a UL BWP based on the center position of the frequency bandwidth of a selected RO.

[0021] Figure 7 This is a diagram showing an example in which the Reduced Capability terminal sets the UL BWP based on the start position of the frequency bandwidth of the selected RO.

[0022] Figure 8 This is a diagram showing an example in which each of a plurality of Reduced Capability terminals sets the UL BWP according to the position of the frequency bandwidth of the RACH occasion selected for transmitting the random access preamble.

[0023] Fig. 9 This is a diagram showing another example in which each of a plurality of Reduced Capability terminals sets the UL BWP according to the position of the frequency bandwidth of the RACH occasion selected for transmitting the random access preamble.

[0024] Fig.10 FIG. 1 is a diagram showing an example in which a Reduced Capability terminal retransmits a random access preamble.

[0025] Fig.11 FIG. 4 is a diagram showing an example of a frequency bandwidth set by a new BWP.

[0026] Fig.12 This is a diagram showing an example of a functional structure of a terminal.

[0027] Fig.13 This is a diagram showing an example of the functional configuration of a base station.

[0028] Fig.14 This is a diagram showing an example of the hardware configuration of a terminal and a base station.

[0029] Description of symbols

[0030] 10 Terminal

[0031] 110 Sending Department

[0032] 120 Receiving Department

[0033] 130 Control Department

[0034] 20 Base Stations

[0035] 210 Sending Department

[0036] 220 Receiving Department

[0037] 230 Control Department

[0038] 1001 Processor

[0039] 1002 Memory

[0040] 1003 Memory

[0041] 1004 Communication device

[0042] 1005 Input Device

[0043] 1006 Output Device DETAILED DESCRIPTION

[0044] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In addition, the embodiment described below is only an example, and the embodiment to which the present invention is applied is not limited to the following embodiment.

[0045] It is envisaged that the wireless communication system in the following embodiments basically complies with NR, but this is only an example, and the wireless communication system in this embodiment may comply with a wireless communication system other than NR (e.g., LTE) in part or in whole.

[0046] (System overall structure)

[0047] Figure 1 1 shows a structural diagram of a wireless communication system according to the present embodiment. Figure 1 As shown, the wireless communication system involved in this embodiment includes a terminal 10 and a base station 20. Figure 1 In the figure, one terminal 10 and one base station 20 are respectively shown, but this is only an example, and there may be a plurality of each.

[0048] The terminal 10 is a communication device with a wireless communication function, such as a smartphone, a mobile phone, a tablet computer, a wearable terminal, or a communication module for M2M (Machine-to-Machine). The terminal 10 receives a control signal or data from the base station 20 via a downlink (DL) and sends a control signal or data to the base station 20 via an uplink (UL), thereby utilizing various communication services provided by the wireless communication system. For example, the channel sent from the terminal 10 includes a PUCCH (Physical Uplink Control Channel) and a PUSCH (Physical Uplink Shared Channel). In addition, the terminal 10 may be referred to as a UE and the base station 20 may be referred to as a gNB.

[0049] In addition, in the present embodiment, the duplex method may be a TDD (Time Division Duplex) method or a FDD (Frequency Division Duplex) method.

[0050] In addition, in an embodiment of the present invention, regarding "setting (Configure)" or "specifying" wireless parameters, it can be that a predetermined value is pre-set (Pre-configured) in the base station 20 or the terminal 10, it can be assumed that the base station 20 or the terminal 10 is pre-set (Pre-configured), or it can be that the wireless parameters are set and notified from the base station 20 or the terminal 10.

[0051] The base station 20 is a communication device that provides more than one cell and performs wireless communication with the terminal 10. The physical resources of the wireless signal are defined by the time domain and the frequency domain. The time domain can be defined by the number of OFDM symbols, and the frequency domain can be defined by the number of subcarriers or the number of resource blocks. The base station 20 sends synchronization signals and system information to the terminal 10. Synchronization signals are, for example, NR-PSS and NR-SSS. A part of the system information is sent, for example, through NR-PBCH, also known as broadcast information. The synchronization signal and the broadcast information can be periodically sent as an SS block (SS / PBCH block) consisting of a predetermined number of OFDM symbols. For example, the base station 20 sends a control signal or data to the terminal 10 via DL (Downlink), and receives a control signal or data from the terminal 10 via UL (Uplink). Both the base station 20 and the terminal 10 can perform beamforming to send and receive signals. For example, the reference signal sent from the base station 20 includes CSI-RS (Channel State Information Reference Signal), and the channel sent from the base station 20 includes PDCCH (Physical Downlink Control Channel) and PDSCH (Physical Downlink Shared Channel).

[0052] (Multi-numerology)

[0053] In order to support wider frequencies or use cases in 5G, it is necessary to support multiple Numerologies (radio parameters such as subcarrier spacing and symbol length). Therefore, it is effective to design variable parameters in a scalable manner based on the parameter set (Numerology) of LTE. With this idea in mind, NR's Multi-numerology was introduced. Specifically, the base subcarrier spacing is the same as that of LTE and is set to 15kHz. Other subcarrier spacings are specified by multiplying the base subcarrier spacing by a power of 2. Multiple subcarrier spacing configurations (subcarrier spacing configuration) μ are specified. Specifically, for μ=0, the subcarrier spacing Δf=15kHz can be specified; for cyclic prefix=Normal and μ=1, the subcarrier spacing Δf=30kHz can be specified; for cyclic prefix=Normal and μ=2, the subcarrier spacing Δf=60kHz can be specified; for cyclic prefix=Normal or Extended and μ=3, the subcarrier spacing Δf=120kHz can be specified; for cyclic prefix=Normal or Extended and μ=4, the subcarrier spacing Δf=240kHz and cyclic prefix=Normal can be specified.

[0054] For any case where the subcarrier spacing configuration μ=0, 1, 2, 3, 4, the number of OFDM symbols included in one time slot is set to 14. However, for the case where the subcarrier spacing configuration μ=0, 1, 2, 3, 4, the number of time slots included in one frame is 10, 20, 40, 80, 160, and the number of time slots included in one subframe is 1, 2, 4, 8, 16. Among them, the frame length is 10ms, so for the case where the subcarrier spacing configuration μ=0, 1, 2, 3, 4, the time slot length is 1ms, 0.5ms, 0.25ms, 0.125ms, 0.0625ms. For any case where the subcarrier spacing configuration μ=0, 1, 2, 3, 4, the number of OFDM symbols included in one time slot is also 14, so the OFDM symbol length is different according to each subcarrier spacing configuration. For the case where the subcarrier spacing is configured as μ=0, 1, 2, 3, 4, the OFDM symbol length is (1 / 14) ms, (0.5 / 14) ms, (0.25 / 14) ms, (0.125 / 14) ms, (0.0625 / 14) ms. Thus, by shortening the time slot length and the OFDM symbol length, low-latency communication can be achieved. For example, the base station 20 can set the subcarrier spacing for the terminal 10 by specifying any one of μ=0, 1, 2, 3, 4 in the parameter subcarrierSpacing of the information element BWP.

[0055] In the standardization of the Third Generation Partnership Project (3GPP), a new type of device with lower cost and lower complexity than eMBB (enhanced Mobile Broadband) / URLLC (Ultra-Reliable and Low Latency Communications) devices is studied as Reduced Capability NR devices (sometimes also called NR-light UE).

[0056] Reduced Capability NR devices (hereinafter referred to as Reduced Capability terminals 10) refer to devices whose performance is intermediate between eMBB / URLLC devices and LPWA (Low Power Wide Area, LTE-M / NB-IoT) devices.

[0057] As for the Reduced Capability terminal 10, as examples of characteristic elements, a compact form factor and a long battery life can be considered.

[0058] As examples of Reduced Capability terminal functions, UE Bandwidth reduction (a function that makes the bandwidth supported by the terminal narrower than the bandwidth supported by a typical NR device), Reduced number of UERX / TX antennas (a function that makes the number of antennas supported by the terminal less than the number of antennas supported by a typical NR device), Half-Duplex-FDD, Relaxed UP processing time, Relaxed UE processing capability, etc. are studied.

[0059] Figure 2 FIG. 1 is a diagram showing an example of a table defining the width of the frequency resource of the PRACH (Physical Random Access Channel) of the NR. Figure 2 As shown in the example, the width of the NR PRACH frequency resource is determined by the PRACH subcarrier spacing (SCS) (Δf RAfor PRACH), SCS of PUSCH (Δf for PUSCH), and sequence length of PRACH (L RA ) is determined by the combination of . The width of the frequency resource of the NR PRACH is calculated as the number of resource blocks calculated based on the SCS of the PUSCH. Figure 2 In the example, the width of the frequency resource of NR's PRACH is any one of 2RB, 3RB, 6RB, 12RB, and 24RB.

[0060] In addition, Figure 2 In the example of , as a result of adding the specification for NR-U (Unlicensed band), 48RB and 96RB can also be selected as the width of the frequency resource of NR's PRACH. However, the 48RB and 96RB added for NR-U can be used only when NR-U is used, or can be used regardless of NR-U operation / normal NR operation.

[0061] Figure 3 FIG. 1 is a diagram showing an example of frequency division multiplexing (FDM) of RACH occasion (RO). Figure 3 As shown in the example, in the PRACH of NR, multiple ROs (up to eight ROs) can be frequency-division multiplexed. In sending a random access preamble, the terminal 10 selects any one of the multiple ROs that are frequency-division multiplexed to send the random access preamble. Before sending the random access preamble, the bandwidth part (Bandwidthpart, BWP) of the uplink can be set by broadcast information, etc., and multiple ROs that are FDMed can be configured within the bandwidth of the BWP.

[0062] (About the topic)

[0063] Figure 4 This is a diagram showing an example of the positional relationship between the reduced bandwidth (Reduced bandwidth) of the Reduced Capability terminal 10 and multiple ROs that are frequency-division multiplexed. For example, depending on the relationship between the bandwidth of the RO and the reduced bandwidth of the terminal 10, it may be impossible to allocate a frequency bandwidth for the terminal's transmission or reception to the terminal 10 so as to be able to properly send a random access preamble (for example, the case where the reduced bandwidth of the terminal 10 (for example, 20 RB) is smaller than the bandwidth of one RO (for example, 24 RB)).

[0064] In addition, if Figure 4As shown in the example, even if the terminal 10 is able to send a random access preamble, when the BWP pre-set for the terminal 10 is a reduced bandwidth, the multiple ROs that are frequency-division multiplexed are not included in the BWP pre-set for the terminal 10 as a whole, and the ROs that can be used to send the random access preamble may be limited.

[0065] The plurality of frequency-division-multiplexed ROs may be associated with different plurality of SSBs, respectively. Therefore, the SSBs that the terminal 10 can use are also limited, and the location of the terminal 10 at which the terminal 10 can access the cell may be limited.

[0066] (Proposal 1)

[0067] The reduced bandwidth (Reduced bandwidth) of the Reduced Capability terminal 10 may be any bandwidth from the bandwidth of option 1 to the bandwidth of option 4 described below. Based on the provisions of the specification, one or more bandwidths from the bandwidth of option 1 to the bandwidth of option 4 described below are specified, and any of the bandwidths may be the reduced bandwidth of the Reduced Capability terminal 10. In addition, the RB described below may be the number of RBs calculated based on the SCS of the PUSCH, or may be specified as the value of the RB converted to the SCS of the PRACH or other SCS.

[0068] (Option 1 of Proposal 1)

[0069] The reduced bandwidth may be 24 RB. In addition, the reduced bandwidth may be any bandwidth from 24 RB to 96 RB.

[0070] For example, in Figure 2 In the example shown, in addition to the additional PRACH sequence length (L RA ) that is, in addition to 571 and 1151, you can use Figure 2 The SCS (Δf RA for PRACH), SCS of PUSCH (Δf forPUSCH), and sequence length of PRACH (L RA ) combination. In the SCS (Δf RA forPRACH), SCS of PUSCH (Δf for PUSCH), and sequence length of PRACH (L RA ) can only be used when NR-U is in use. In normal NR operation, Figure 2Any combination among the multiple combinations shown, other than the combination added for NR-U.

[0071] (Option 2 of Proposal 1)

[0072] The reduced bandwidth may be 96 RB. In addition, the reduced bandwidth may be a bandwidth greater than 96 RB.

[0073] For example, in Figure 2 In the example shown, the sequence length (L RA ) that is, 571 and 1151, you can use Figure 2 As shown, the SCS (Δf RA for PRACH), SCS of PUSCH (Δf forPUSCH), and sequence length of PRACH (L RA ) in any combination.

[0074] By setting the reduced bandwidth to 96 RB or more, it can be used indiscriminately in both NR-U operation and normal NR operation. Figure 2 Any combination of the SCS of the PRACH, the SCS of the PUSCH, and the sequence length of the PRACH shown.

[0075] (Option 3 of Proposal 1)

[0076] The reduced bandwidth may be 20 RB. In addition, the reduced bandwidth may be any bandwidth greater than 20 RB and less than 24 RB.

[0077] For example, in Figure 2 In the example shown, the combination of the SCS of the PRACH, the SCS of the PUSCH, and the sequence length of the PRACH that can be used in the Reduced Capability terminal 10 can be limited to a combination in which the width of the frequency resource of the NR PRACH is less than 24RB. In addition, by setting the bandwidth part (bandwidth part) of the downlink of the Reduced Capability terminal 10 to more than 20RB, SSB (20RB) can be received.

[0078] (Option 4 of Proposal 1)

[0079] The reduced bandwidth may be 12 RB. In addition, the reduced bandwidth may be any bandwidth greater than 12 RB and less than 20 RB.

[0080] For example, in Figure 2 In the example shown, the combination of the SCS of the PRACH, the SCS of the PUSCH, and the sequence length of the PRACH that can be used in the Reduced Capability terminal 10 can be limited to a combination in which the width of the frequency resource of the NR PRACH is less than the reduced bandwidth of 20RB. In addition, when the bandwidth part of the downlink of the Reduced Capability terminal 10 is set to less than the reduced bandwidth of 20RB, the bandwidth in which the SSB is transmitted can be set to less than the reduced bandwidth of 20RB.

[0081] In the above-mentioned options 1 to 4, the reduced bandwidth may be the capability of the terminal 10, and the capability of the terminal 10 may be notified from the terminal 10 to the base station 20. Furthermore, the reduced bandwidth may be determined according to the PRACH bandwidth.

[0082] Furthermore, in the above-mentioned options 1 to 4, the reduced bandwidth (Reduced bandwidth) may be a common value or different values ​​in the downlink (DL) and the uplink (UL).

[0083] In addition, in the above-mentioned options 1 to 4, the reduced bandwidth (Reduced bandwidth) of the Reduced Capability terminal 10 can be a common capability in the downlink (DL) and the uplink (UL). In addition, in the above-mentioned options 1 to 4, the reduced bandwidth (Reduced bandwidth) of the Reduced Capability terminal 10 can be different capabilities in the downlink (DL) and the uplink (UL).

[0084] (Proposal 2)

[0085] (Option 1 of Proposal 2)

[0086] The Reduced Capability terminal 10 can set the UL BWP according to the position of the frequency bandwidth of the RACHoccasion selected for transmitting the random access preamble.

[0087] The Reduced Capability terminal 10 may set the UL BWP based on the start position of the frequency bandwidth of the selected RO or the center position of the frequency bandwidth of the selected RO.

[0088] Figure 5 FIG. 1 is a diagram showing an example in which the Reduced Capability terminal 10 sets the ULBWP according to the position of the bandwidth of the selected RO. Figure 5 In the example of , the terminal 10 selects an RO and sets a UL BWP having the same bandwidth as the frequency bandwidth of the selected RO.

[0089] Figure 6 1 is a diagram showing an example in which the Reduced Capability terminal 10 sets the UL BWP based on the center position of the bandwidth of the selected RO. Figure 6 In the example of , the terminal 10 selects an RO and sets a UL BWP of the same center frequency as the center position of the frequency bandwidth of the selected RO.

[0090] Figure 7 1 is a diagram showing an example in which the Reduced Capability terminal 10 sets the UL BWP based on the start position of the bandwidth of the selected RO. Figure 7 In the example of , the terminal 10 selects an RO and sets a UL BWP at the same starting position in the frequency direction as the starting position of the frequency bandwidth of the selected RO.

[0091] The Reduced Capability terminal 10 can set a UL BWP having a reduced bandwidth (Reduced bandwidth) possessed by the Reduced Capability terminal 10. For example, a UL BWP having a bandwidth corresponding to the Capability of the Reduced Capability terminal 10 can be set.

[0092] In addition, the bandwidth other than the reduced bandwidth of the Reduced Capability terminal 10 may be specified and / or notified, and the terminal 10 may set a UL BWP having the specified and / or notified bandwidth. For example, the terminal 10 may set a UL BWP having the same bandwidth as the bandwidth of the selected RO. For example, the terminal 10 may set a UL BWP having the same bandwidth as the bandwidth of the notified UL BWP.

[0093] In addition, the Reduced Capability terminal 10 can set the (Active) DL BWP according to the position of the frequency bandwidth of the RACH occasion selected for transmitting the random access preamble. The Reduced Capability terminal 10 can set the (Active) DL BWP based on the starting position of the frequency bandwidth of the selected RO or the center position of the frequency bandwidth of the selected RO. For example, the Reduced Capability terminal 10 can select the RO and set the (Active) DL BWP of the same bandwidth as the frequency bandwidth of the selected RO. The Reduced Capability terminal 10 can select the RO and set the (Active) DL BWP of the same center position as the center position of the frequency bandwidth of the selected RO. In addition, the Reduced Capability terminal 10 can select the RO and set the (Active) DL BWP of the same starting position in the frequency direction as the starting position of the frequency bandwidth of the selected RO. In addition, for example, some or all parameters (bandwidth, frequency position, etc.) of the (Active) DL BWP can be the same as the set (Active) UL BWP.

[0094] The base station 20 may set the UL BWP in advance before selecting a RACH occasion for the Reduced Capability terminal 10 to send a random access preamble. In addition, the base station 20 may not set the UL BWP in advance before selecting a RACH occasion for the Reduced Capability terminal 10 to send a random access preamble. When the base station 20 sets the UL BWP in advance before selecting a RACH occasion for the Reduced Capability terminal 10 to send a random access preamble, the Reduced Capability terminal 10 may directly apply the bandwidth of the UL BWP set in advance by the base station 20, and may adjust the frequency position of the UL BWP according to the position of the frequency bandwidth of the RO selected by the Reduced Capability terminal 10 (for example, the Reduced Capability terminal 10 may adjust the frequency position of the UL BWP so that the frequency band of the selected RO is included in the UL BWP). Alternatively, the Reduced Capability terminal 10 may make an adjustment so that the newly set UL BWP is included in the band of the UL BWP set in advance by the base station 20.

[0095] Between SSB and RO, a time gap or processing time (e.g., specified in the specification) required for switching of BWP (e.g., processing to shift the position of BWP) by the terminal 10 may be specified. Switching of BWP requires processing such as RF (Radio Frequency) tuning in the terminal 10.

[0096] Figure 8 and Fig. 9 FIG. 1 is a diagram showing an example in which each of a plurality of Reduced Capability terminals 10 sets a UL BWP according to the position of the frequency bandwidth of the RACH occasion selected for transmitting a random access preamble. Figure 8 In the example, the position of the bandwidth of the RO selected by terminal #1 is different from the position of the bandwidth of the RO selected by terminal #2. Terminal #1 selects the same bandwidth position and the same bandwidth UL BWP as the selected RO. Terminal #2 selects the same bandwidth position and the same bandwidth UL BWP as the selected RO. Fig. 9 In the example, the position of the frequency bandwidth of the RO selected by terminal #1 is the same as the position of the frequency bandwidth of the RO selected by terminal #2. Terminal #1 and terminal #2 set the same frequency bandwidth position and the same bandwidth UL BWP as the selected RO. In this case, if the capability of terminal #1 is different from that of terminal #2, the bandwidth of the UL BWP set by terminal #1 and the bandwidth of the UL BWP set by terminal #2 may be different.

[0097] Fig.10 FIG. 1 is a diagram showing an example of retransmitting a random access preamble by a Reduced Capability terminal 10. Fig.10 As shown in the example, when the Reduced Capability terminal 10 selects a RO different from the RO used when the random access preamble is first transmitted during retransmission of the random access preamble, the Reduced Capability terminal 10 can set (Active) the UL BWP according to the position of the bandwidth of the RO selected by the retransmission.

[0098] (Supplement to Proposal 2)

[0099] The bandwidth set by the "BWP" in the above-mentioned embodiment may be a bandwidth different from the bandwidth set by the existing BWP. In this case, the name of the "BWP" in the above-mentioned embodiment may be a name different from the name of the BWP. For example, the bandwidth set by the "BWP" in the above-mentioned embodiment may be a finer bandwidth newly defined within the framework of the existing BWP. In addition, the bandwidth set by the "BWP" in the above-mentioned embodiment may be a bandwidth that can be used only within the frequency range of the existing BWP.

[0100] Fig.11 FIG. 4 is a diagram showing an example of a bandwidth set by a new BWP. Fig.11 As shown in the example of , the frequency bandwidth set by the new BWP can be the frequency bandwidth included in the frequency range of the existing BWP.

[0101] In addition, when the frequency bandwidth set by the "BWP" in the above-mentioned embodiment is the same as the frequency bandwidth set by the existing BWP, "setting BWP" may refer to replacing part of the parameters of the currently activated BWP that has been set, or it may refer to setting a new BWP and setting the set new BWP as active.

[0102] (Option 2 of Proposal 2)

[0103] The Reduced Capability terminal 10 can set an activated UL BWP with a bandwidth wider than the reduced bandwidth (Reduced bandwidth) of the terminal 10 when sending a random access preamble, and can send the random access preamble within this range. For example, according to the capability of the Reduced Capability terminal 10, when a 20MHz BWP can be set, a 100MHz UL BWP can be set when sending a random access preamble. In this case, the Reduced Capability terminal 10 cannot send the random access preamble in the entire 100MHz UL BWP, but can send the random access preamble in the 20MHz UL BWP included in the 100MHz bandwidth.

[0104] The Reduced Capability terminal 10 can perform RF tuning as needed each time it performs UL transmission. For example, according to the capability of the Reduced Capability terminal 10, when the capability of the frequency bandwidth up to 20 MHz is provided, a UL BWP of 100 MHz can be set when a random access preamble is transmitted. In this case, for example, each time a random access preamble is transmitted, the Reduced Capability terminal 10 can set a position to transmit a 20 MHz random access preamble within a UL BWP of 100 MHz. For example, the gap, processing time, etc. required for the RF tuning performed by the Reduced Capability terminal 10 can be specified (for example, it can be specified by the specification).

[0105] The Reduced Capability terminal 10 can set an activated UL BWP with a bandwidth wider than the reduced bandwidth (Reduced bandwidth) of the terminal 10 when sending a random access preamble code, and continue to send random access preamble codes according to its own bandwidth capability within this range until the UL BWP is set through RRC signaling, etc.

[0106] In the case where the Reduced Capability terminal 10 is capable of setting an activated UL BWP with a bandwidth wider than the reduced bandwidth (Reduced bandwidth) possessed by the terminal 10 when sending a random access preamble, the Reduced Capability terminal 10 is also capable of setting an activated DL BWP with a bandwidth wider than the reduced bandwidth possessed by the terminal 10 regarding the DL BWP. In the case where the Reduced Capability terminal 10 is capable of setting an activated UL BWP with a bandwidth wider than the reduced bandwidth (Reduced bandwidth) possessed by the terminal 10 when sending a random access preamble, the Reduced Capability terminal 10 may set the DL BWP independently of the set UL BWP, and the DL BWP may be common to the UL BWP.

[0107] (Option 3 of Proposal 2)

[0108] When transmitting a random access preamble, the Reduced Capability terminal 10 may not assume the UL BWP is set and the case where the UL BWP is set. For example, when transmitting a random access preamble, the Reduced Capability terminal 10 may transmit the random access preamble in any frequency band in the frequency band of the system.

[0109] The Reduced Capability terminal 10 can perform RF tuning as needed each time it performs UL transmission. For example, the interval and processing time required for RF tuning performed by the Reduced Capability terminal 10 can be specified (for example, can be specified by the specification).

[0110] The Reduced Capability terminal 10 may continue to perform operations not assuming that the UL BWP is set and that the UL BWP is set when transmitting the random access preamble until the UL BWP is set by RRC signaling or the like.

[0111] (Proposal 3)

[0112] (Option 1 of Proposal 3)

[0113] The Reduced Capability terminal 10 can perform "UL transmission in the random access process" after sending the random access preamble or "UL transmission until the UL BWP is set by RRC, etc." within the frequency range of the BWP when the random access preamble is sent (for example, set by Proposal 2).

[0114] (Option 2 of Proposal 3)

[0115] The Reduced Capability terminal 10 can perform "UL transmission in the random access process" or "UL transmission until the UL BWP is set by RRC, etc." after the random access preamble transmission outside the frequency range of the BWP when the random access preamble is transmitted (for example, set by Proposal 2). In this case, the Reduced Capability terminal 10 can perform RF tuning as needed each time it performs UL transmission. For example, the gap, processing time, etc. required for the RF tuning performed by the Reduced Capability terminal 10 can be specified (for example, by specifications).

[0116] (Option 3 of Proposal 3)

[0117] The Reduced Capability terminal 10 can perform "UL transmission in the random access process" or "UL transmission until the ULBWP is set by RRC, etc." after the random access preamble is sent without assuming the setting of the UL BWP and the way in which the UL BWP is set. In this case, the Reduced Capability terminal 10 can perform RF tuning as needed each time it performs UL transmission. For example, the interval, processing time, etc. required for the RF tuning performed by the Reduced Capability terminal 10 can be specified (for example, it can be specified by the specification).

[0118] In addition, in options 1 to 3 of proposal 3, the "UL transmission in the random access process" or the "UL transmission until the UL BWP is set through RRC, etc." after the random access preamble is sent may include, for example, message 3 (Msg3) of the random access process, MsgA PUSCH in the 2-step random access process, ACK / NACK for DL ​​transmission (Msg2, Msg4, MsgB, other DL), etc.

[0119] In Option 1 to Option 3 of Proposal 3, the frequency position, bandwidth, etc. of the DL BWP set for the Reduced Capability terminal 10 may be the same as the frequency position, bandwidth, etc. of the UL BWP. The frequency position, bandwidth, etc. of the DL BWP set for the Reduced Capability terminal 10 may also be set independently of the frequency position, bandwidth, etc. of the UL BWP.

[0120] (Device Structure)

[0121] Next, a functional configuration example of the terminal 10 and the base station 20 that perform the processing actions described above is described. The terminal 10 and the base station 20 have all the functions described in this embodiment. However, the terminal 10 and the base station 20 may only have a part of all the functions described in this embodiment. In addition, the terminal 10 and the base station 20 may be collectively referred to as a communication device.

[0122] <Terminal>

[0123] Fig.12 1 is a diagram showing an example of the functional structure of the terminal 10. Fig.12 As shown, the terminal 10 includes a transmitting unit 110 , a receiving unit 120 , and a control unit 130 . Fig.12The functional configuration shown is only an example. As long as the operations involved in this embodiment can be performed, the functional division and the names of the functional units can be arbitrary. In addition, the transmission unit 110 can be called a transmitter, and the reception unit 120 can be called a receiver.

[0124] The transmitting unit 110 generates a transmission signal according to the transmission data and transmits the transmission signal wirelessly. In addition, the transmitting unit 110 can form one or more beams. The receiving unit 120 receives various signals wirelessly and obtains a higher layer signal from the received physical layer signal. In addition, the receiving unit 120 includes a measuring unit that measures the received signal and obtains the received power.

[0125] The control unit 130 controls the terminal 10. In addition, the functions of the control unit 130 related to transmission may be included in the transmission unit 110, and the functions of the control unit 130 related to reception may be included in the reception unit 120.

[0126] For example, the control unit 130 of the Reduced Capability terminal 10 sets any bandwidth of 12 RB, 20 RB, 24 RB, and 96 RB as the reduced bandwidth (Reduced bandwidth), and the transmission unit 110 of the Reduced Capability terminal 10 can transmit the random access preamble code in the bandwidth selected by the control unit 130.

[0127] For example, the control unit 130 of the Reduced Capability terminal 10 may select the Bandwidth part (BWP) of the uplink according to the position of the frequency bandwidth of the random access preamble transmission timing selected for sending the random access preamble, and the sending unit 110 of the Reduced Capability terminal 10 may send the random access preamble in the bandwidth selected by the control unit 130.

[0128] <Base station 20>

[0129] Fig.13 2 is a diagram showing an example of the functional configuration of the base station 20. Fig.13 As shown, the base station 20 includes a transmitting unit 210 , a receiving unit 220 , and a control unit 230 . Fig.13 The functional configuration shown is only an example. As long as the operations involved in this embodiment can be performed, the functional division and the names of the functional units can be arbitrary. In addition, the transmission unit 210 can be called a transmitter, and the reception unit 220 can be called a receiver.

[0130] The transmitting unit 210 includes a function of generating a signal to be transmitted to the terminal 10 side and transmitting the signal wirelessly. The receiving unit 220 includes a function of receiving various signals transmitted from the terminal 10 and obtaining, for example, higher-layer information from the received signals. In addition, the receiving unit 220 includes a measuring unit that measures the received signal and obtains the received power and the like.

[0131] The control unit 230 controls the base station 20. In addition, the functions of the control unit 230 related to transmission may be included in the transmission unit 210, and the functions of the control unit 230 related to reception may be included in the reception unit 220.

[0132] For example, the receiving unit 220 of the base station 20 receives capability information indicating that the reduced bandwidth (Reduced bandwidth) of the Reduced Capability terminal 10 is any one of 12RB, 20RB, 24RB and 96RB. The control unit 230 of the base station 20 can set the bandwidth represented by the capability information received by the receiving unit 220 as the bandwidth for receiving the random access preamble code sent from the Reduced Capability terminal 10.

[0133] In addition, for example, the control unit 230 of the base station 20 can be assumed to perform UL transmission within the frequency range of the BWP when the random access preamble is received until the UL BWP is set for the Reduced Capability terminal 10 through RRC signaling after the receiving unit 220 receives the random access preamble sent from the Reduced Capability terminal 10.

[0134] (Hardware Structure)

[0135] The block diagram used in the description of the above-mentioned embodiment ( Fig.12 and Fig.13 ) shows blocks in units of functions. These functional blocks (structural parts) are implemented by any combination of hardware and / or software. In addition, there is no particular limitation on the implementation method of each functional block. That is, each functional block can be implemented by a device that physically and / or logically combines multiple elements, or two or more devices that are physically and / or logically separated can be directly or indirectly (for example, using wires and / or wirelessly) connected and implemented by these multiple devices.

[0136] Furthermore, for example, the terminal 10 and the base station 20 in one embodiment of the present invention may both function as computers that perform the processing involved in this embodiment. Fig.141 is a diagram showing an example of the hardware configuration of the terminal 10 and the base station 20 involved in this embodiment. The above-mentioned terminal 10 and the base station 20 may also be respectively configured as a computer device physically including a processor 1001, a memory 1002 (memory), a storage 1003 (storage), a communication device 1004, an input device 1005, an output device 1006, and a bus 1007.

[0137] In the following description, the word "device" may be replaced by "circuit", "device", "unit", etc. The hardware structure of the terminal 10 and the base station 20 may be configured to include one or more of the devices shown in 1001 to 1006, or may be configured to exclude some of the devices.

[0138] Each function in the terminal 10 and the base station 20 is implemented by the following method: predetermined software (program) is read into hardware such as the processor 1001 and the memory 1002, so that the processor 1001 performs calculations and controls the communication of the communication device 1004, and the reading and / or writing of data in the memory 1002 and the storage 1003.

[0139] The processor 1001 controls the entire computer by, for example, running an operating system. The processor 1001 may be constituted by a central processing unit (CPU) including an interface with peripheral devices, a control device, a calculation device, a register, and the like.

[0140] In addition, the processor 1001 reads a program (program code), a software module or data from the storage 1003 and / or the communication device 1004 to the memory 1002, and performs various processes accordingly. As a program, a program that causes the computer to execute at least a part of the actions described in the above-mentioned embodiments is used. For example, Fig.12 The sending unit 110, the receiving unit 120 and the control unit 130 of the terminal 10 shown may also be implemented by a control program stored in the memory 1002 and operated by the processor 1001. In addition, for example, Fig.13 The transmitter 210, the receiver 220, and the controller 230 of the base station 20 shown in the figure can also be implemented by a control program stored in the memory 1002 and operated by the processor 1001. Regarding the above-mentioned various processes, although it is described that the above-mentioned various processes are performed by one processor 1001, the above-mentioned various processes can also be performed simultaneously or sequentially by more than two processors 1001. The processor 1001 can also be installed by more than one chip. In addition, the program can also be sent from the network via a telecommunication line.

[0141] The memory 1002 is a computer-readable recording medium, and may be composed of at least one of a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electrically Erasable Programmable ROM), a RAM (Random Access Memory), etc. The memory 1002 may also be referred to as a register, a cache, a main memory (main storage device), etc. The memory 1002 can store programs (program codes), software modules, etc. that can be executed to implement the processing involved in one embodiment of the present invention.

[0142] The memory 1003 is a computer-readable recording medium, and may be composed of at least one of an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a floppy disk, a magneto-optical disk (e.g., a compressed disk, a digital versatile disk, a Blu-ray (registered trademark) disk, a smart card, a flash memory (e.g., a card, a stick, a key drive), a Floppy (registered trademark) disk, a magnetic strip, etc. The memory 1003 may also be referred to as an auxiliary storage device. The above-mentioned storage medium may be, for example, other appropriate media such as a database, a server, etc. that includes the memory 1002 and / or the memory 1003.

[0143] The communication device 1004 is hardware (transceiver device) for communicating between computers via a wired network and / or a wireless network, and may also be referred to as a network device, a network controller, a network card, a communication module, etc. For example, the transmitting unit 110 and the receiving unit 120 of the terminal 10 may be implemented by the communication device 1004. In addition, the transmitting unit 210 and the receiving unit 220 of the base station 20 may also be implemented by the communication device 1004.

[0144] The input device 1005 is an input device that receives input from the outside (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.). The output device 1006 is an output device that implements output to the outside (e.g., a display, a speaker, an LED light, etc.). In addition, the input device 1005 and the output device 1006 may also be integrally formed (e.g., a touch panel).

[0145] In addition, the processor 1001 and the memory 1002 and other devices are connected via a bus 1007 for communicating information. The bus 1007 may be configured using a single bus or different buses between devices.

[0146] In addition, the terminal 10 and the base station 20 can be respectively configured to include hardware such as a microprocessor, a digital signal processor (DSP), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), and an FPGA (Field Programmable Gate Array), and a part or all of each functional block can also be implemented by the hardware. For example, the processor 1001 can also be installed using at least one of these hardware.

[0147] (Summary of Implementation Methods)

[0148] This specification discloses at least the following terminal and base station.

[0149] A terminal comprises: a control unit, which selects a transmission timing for sending a random access preamble code, and sets a frequency bandwidth for sending or receiving of the terminal based on the starting position of the frequency bandwidth of the selected transmission timing or the center position of the frequency bandwidth of the selected transmission timing, so that the random access preamble code can be sent in the frequency bandwidth of the transmission timing; and a sending unit, which sends the random access preamble code according to the frequency bandwidth set by the control unit.

[0150] According to the above configuration, the terminal selects a frequency bandwidth for transmission or reception of the terminal based on the frequency bandwidth of the transmission timing selected for transmitting the random access preamble so as to be able to appropriately transmit the random access preamble, thereby preventing the setting of a frequency bandwidth that cannot transmit the random access preamble.

[0151] The bandwidth used for transmission or reception of the terminal or the reduced bandwidth capability of the terminal can be any bandwidth within the range from a bandwidth of 12 resource blocks to a bandwidth of 96 resource blocks, so that the random access preamble code can be sent in the bandwidth at the transmission timing.

[0152] According to the above configuration, the PRACH SCS (Δf RA for PRACH), SCS of PUSCH (Δf for PUSCH), and sequence length of PRACH (L RA ) to send a random access preamble code in any combination of the combinations.

[0153] After sending the random access preamble, the control unit may apply the frequency bandwidth for sending or receiving of the terminal, which is set so as to be able to send the random access preamble in the frequency bandwidth at the sending opportunity, as the frequency bandwidth for uplink transmission during the execution of the random access procedure.

[0154] According to the above configuration, the frequency bandwidth used for uplink transmission until receiving the terminal capability information (UE capability information) transmitted from the terminal is clarified, and the uplink reception operation until receiving the terminal capability information in the base station side can be clarified.

[0155] When the random access preamble code is retransmitted after the initial transmission of the random access preamble code, the control unit may select a transmission timing of the random access preamble code that is different from the transmission timing of the random access preamble code selected when the random access preamble code is initially transmitted, and set a frequency bandwidth used for transmission or reception of the terminal based on a starting position or a center position of a frequency bandwidth of the transmission timing of the random access preamble code that is different from the transmission timing of the random access preamble code selected when the random access preamble code is initially transmitted, so that the random access preamble code can be retransmitted within the frequency bandwidth of the transmission timing.

[0156] According to the above-mentioned structure, even if the transmission timing selected by the terminal when the random access preamble code is initially transmitted is different from the transmission timing selected when the random access preamble code is retransmitted, the terminal can set the bandwidth used for the transmission or reception of the terminal according to the bandwidth of the transmission timing selected at the time of retransmission so that the random access preamble code can be appropriately retransmitted, thereby preventing the setting of a bandwidth that cannot transmit the random access preamble code.

[0157] A base station comprises: a control unit which sets a frequency bandwidth for sending or receiving a terminal based on the starting position of a frequency bandwidth of a transmission opportunity for a terminal to send a random access preamble or the center position of the frequency bandwidth of the transmission opportunity so that the random access preamble can be sent in the frequency bandwidth of the transmission opportunity; and a receiving unit which receives the random access preamble according to the frequency bandwidth set by the control unit.

[0158] According to the above-mentioned structure, the terminal selects the bandwidth for sending or receiving the terminal according to the bandwidth of the sending opportunity selected for sending the random access preamble code, so that the random access preamble code can be properly sent, thereby preventing the setting of a bandwidth that cannot send the random access preamble code. The base station sets the bandwidth for sending or receiving according to the bandwidth of the sending opportunity used for the terminal to send the random access preamble code, so that the random access preamble code can be properly received.

[0159] (Supplementary Implementation Methods)

[0160] The above describes the embodiments of the present invention, but the disclosed invention is not limited to such embodiments, and a person of ordinary skill in the art should understand various variations, modifications, substitutions, replacements, etc. In order to facilitate the understanding of the invention, specific numerical examples are used for description, but unless otherwise specified, these numerical values ​​are only examples, and any appropriate value may also be used. The distinction between the items in the above description is not essential to the present invention, and the items recorded in more than two items may be combined and used as needed, or the items recorded in a certain item may be applied to the items recorded in other items (as long as there is no contradiction). The boundaries of the functional units or processing units in the functional block diagram do not necessarily correspond to the boundaries of the physical components. The actions of multiple functional units may be physically performed by one component, or the actions of one functional unit may be physically performed by multiple components. With respect to the processing described in the embodiment, the order of processing may be swapped if there is no contradiction. In order to facilitate the description of the processing, the terminal 10 and the base station 20 are described using a functional block diagram, but such a device may also be implemented in hardware, software, or a combination thereof. The software that operates through the processor of the terminal 10 according to the embodiment of the present invention and the software that operates through the processor of the base station 20 according to the embodiment of the present invention may also be stored in random access memory (RAM), flash memory, read-only memory (ROM), EPROM, EEPROM, registers, hard disk (HDD), removable disk, CD-ROM, database, server and any other appropriate storage medium.

[0161] In addition, the notification of information is not limited to the form / implementation method described in this specification, and other methods may also be used. For example, the notification of information may be implemented through physical layer signaling (e.g., DCI (Downlink Control Information), UCI (Uplink Control Information)), high-layer signaling (e.g., RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, broadcast information (MIB (Master Information Block), SIB (System Information Block)), other signals or a combination thereof. In addition, RRC signaling may also be referred to as an RRC message, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc.

[0162] The various forms / implementations described in this specification may also be applied to LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G, 5G, FRA (Future Radio Access), W-CDMA (registered trademark), GSM (registered trademark), CDMA 2000, UMB (UltraMobile Broadband), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), systems using other appropriate systems, and / or next-generation systems extended thereby.

[0163] The processing procedures, timings, and flows of each form / implementation described in this specification may be changed in order if there is no contradiction. For example, the methods described in this specification use the order in which the elements of various steps are presented, but are not limited to the specific order presented.

[0164] In this specification, a specific action performed by the base station 20 is sometimes performed by its upper node according to the situation. In a network composed of one or more network nodes having the base station 20, various actions performed to communicate with the terminal 10 can be performed by the base station 20 and / or other network nodes other than the base station 20 (for example, MME or S-GW, etc. are considered, but not limited to these). In the above, the case where there is one other network node other than the base station 20 is illustrated, but the other network node may also be a combination of multiple other network nodes (for example, MME and S-GW).

[0165] Each form / implementation method described in this specification may be used alone or in combination, and may be switched and used according to execution.

[0166] For the terminal 10, those skilled in the art sometimes also use the following terms to refer to it: subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other appropriate terms.

[0167] For the base station 20, those skilled in the art sometimes also use the following terms: NB (NodeB), eNB (enhanced NodeB), base station (Base Station), gNB, or some other appropriate terms.

[0168] Bandwidth Part (BWP) (also called partial bandwidth, etc.) represents a subset of contiguous common RBs (common resource blocks) for a parameter set in a certain carrier. Here, the common RB can be determined by the index of the RB based on the common reference point of the carrier. PRBs are defined in a certain BWP and numbered within the BWP.

[0169] The BWP may include a BWP for UL (UL BWP) and a BWP for DL ​​(DL BWP). One or more BWPs may be configured for a UE within one carrier.

[0170] At least one of the set BWPs may be active, and it is not assumed that the UE transmits or receives a predetermined signal / channel outside the activated BWP. In addition, "cell", "carrier" and the like in the present disclosure may be replaced with "BWP".

[0171] A radio frame may be composed of one or more frames in the time domain. In the time domain, one or more frames may be referred to as subframes. Furthermore, a subframe may be composed of one or more time slots in the time domain. A subframe may be a fixed time length (e.g., 1 ms) that is independent of a parameter set (numerology). A parameter set may be a communication parameter applied to at least one of the transmission and reception of a certain signal or channel. A parameter set may, for example, represent at least one of a subcarrier spacing (SCS: SubCarrier Spacing), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI: Transmission Time Interval), the number of symbols per TTI, a radio frame structure, a specific filtering process performed by a transceiver in the frequency domain, a specific windowing process performed by a transceiver in the time domain, and the like. A time slot may be composed of one or more symbols (OFDM (Orthogonal Frequency Division Multiplexing: Orthogonal Frequency Division Multiplexing) symbols, SC-FDMA (Single Carrier Frequency Division Multiple Access: Single Carrier Frequency Division Multiple Access) symbols, etc.) in the time domain. A time slot may be a time unit based on a parameter set. A time slot may contain multiple mini time slots. Each mini time slot may be composed of one or more code elements in the time domain. In addition, a mini time slot may also be referred to as a sub-time slot. A mini time slot may be composed of a smaller number of code elements than a time slot. A PDSCH (or PUSCH) sent in a time unit larger than a mini time slot may be referred to as a PDSCH (or PUSCH) mapping type (type) A. A PDSCH (or PUSCH) sent using a mini time slot may be referred to as a PDSCH (or PUSCH) mapping type (type) B. Radio frames, subframes, time slots, mini time slots, and code elements all represent time units when transmitting signals. Radio frames, subframes, time slots, mini time slots, and code elements may use other corresponding names, respectively. For example, 1 subframe may be referred to as a transmission time interval (TTI: Transmission Time Interval), multiple consecutive subframes may also be referred to as TTIs, and 1 time slot or 1 mini time slot may also be referred to as TTIs. That is, at least one of the subframe and TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (e.g., 1-13 symbols), or a period longer than 1 ms. In addition, the unit representing TTI may not be a subframe but a time slot, a mini time slot, or the like.

[0172] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in the LTE system, the base station performs scheduling to allocate wireless resources (frequency bandwidth, transmission power, etc. that can be used in each user terminal) to each user terminal in units of TTI. In addition, the definition of TTI is not limited to this. TTI can be a transmission time unit for data packets (transmission blocks), code blocks, code words, etc. after channel coding, or a processing unit for scheduling, link adaptation, etc. In addition, when TTI is assigned, the time interval (for example, the number of symbols) to which the transmission block, code block, code word, etc. is actually mapped can be shorter than the TTI. In addition, in the case where 1 time slot or 1 mini time slot is referred to as TTI, more than one TTI (that is, more than one time slot or more than one mini time slot) can constitute the minimum time unit for scheduling. In addition, the number of time slots (the number of mini time slots) constituting the minimum time unit of the scheduling can be controlled. A TTI having a time length of 1 ms is also referred to as a normal TTI (TTI in LTE Rel.8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a time slot, etc. A TTI shorter than a normal TTI may be referred to as a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a mini-time slot, a sub-time slot, a time slot, etc. In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be replaced with a TTI having a time length of more than 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be replaced with a TTI having a TTI length less than that of a long TTI and having a TTI length of more than 1 ms.

[0173] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain. In the frequency domain, it may include one or more consecutive subcarriers. The number of subcarriers included in an RB may be the same regardless of the parameter set, for example, it may be 12. The number of subcarriers included in an RB may also be determined according to the parameter set. In addition, the time domain of an RB may include one or more symbols, which may be the length of 1 time slot, 1 mini time slot, 1 subframe, or 1 TTI. 1TTI, 1 subframe, etc. may be composed of one or more resource blocks, respectively. In addition, one or more RBs may be called a physical resource block (PRB: Physical RB), a subcarrier group (SCG: Sub-Carrier Group), a resource element group (REG: Resource Element Group), a PRB pair, an RB pair, etc. In addition, a resource block may be composed of one or more resource elements (RE: Resource Element). For example, 1RE may be a wireless resource area of ​​1 subcarrier and 1 symbol.

[0174] The terms "determining" and "determining" used in this specification sometimes also include situations of various actions. "Judgment" and "determination" may, for example, include situations in which matters that have been judged, calculated, calculated, processed, derived, investigated, searched (for example, searched in a table, database or other data structure), confirmed (ascertaining) are regarded as "judgment" and "determination". In addition, "judgment" and "determination" may include matters that have been received (for example, receiving information), transmitted (for example, transmitting information), input, output, accessed (for example, accessed data in memory) as "judgment" and "determination". In addition, "judgment" and "determination" may include matters that have been resolved (resolving), selected (selecting), chosen (choosing), established (establishing), compared (comparing), etc. as "judgment" and "determination". That is, "judgment" and "determination" may include matters that have been "judged" and "determined" for any action.

[0175] The phrase "based on" used in this specification does not mean "only based on" unless otherwise clearly stated. In other words, the phrase "based on" means both "only based on" and "at least based on".

[0176] When the words "include", "including" and their variations are used in this specification or claims, these words mean inclusiveness like the word "comprising". In addition, the word "or" used in this specification or claims does not mean exclusive or.

[0177] Throughout the present disclosure, when articles are added by translation, such as a, an, and the in English, for example, these articles may include plural forms unless it is clear from the context that this is not the case.

[0178] The present invention has been described in detail above, but it should be clear to those skilled in the art that the present invention is not limited to the embodiments described in this specification. The present invention can be implemented as a modification and variation without departing from the gist and scope of the present invention as determined by the description of the claims. Therefore, the purpose of the description of this specification is to illustrate and not to have any limiting significance on the present invention.

Claims

1. A terminal comprising: a receiving unit that receives, from a base station, setting information for setting a reduced uplink bandwidth portion corresponding to an uplink bandwidth supported by a terminal; a control unit configured to set the uplink bandwidth portion according to the setting information; as well as A sending unit is configured to send a message in a random access process to the base station using the set uplink bandwidth portion.

2. The terminal according to claim 1, wherein: The control unit sets the uplink bandwidth portion within a bandwidth of 20 MHz.

3. A base station, comprising: A sending unit, which sends setting information to the terminal, wherein the setting information is used to set the reduced uplink bandwidth part; A receiving unit receives a message in a random access procedure transmitted by the terminal using the uplink bandwidth portion configured according to the configuration information.

4. A communication system comprising a terminal and a base station, The terminal has: a receiving unit that receives, from a base station, setting information for setting a reduced uplink bandwidth portion corresponding to an uplink bandwidth supported by a terminal; a control unit configured to set the uplink bandwidth portion according to the setting information; as well as a sending unit, which uses the set uplink bandwidth part to send a message in a random access process to the base station, The base station has: A sending unit, configured to send the setting information to a terminal; A receiving unit receives a message in a random access procedure transmitted by the terminal using the uplink bandwidth portion configured according to the configuration information.

5. A communication method, executed by a terminal, comprising the following steps: receiving, from a base station, setting information for setting a reduced uplink bandwidth portion corresponding to an uplink bandwidth supported by a terminal; Setting the uplink bandwidth portion according to the setting information; as well as A message in a random access procedure is sent to the base station using the set uplink bandwidth portion.

Images