WO2024095440A1 - Station de base, terminal et système de communication sans fil - Google Patents

Station de base, terminal et système de communication sans fil Download PDF

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Publication number
WO2024095440A1
WO2024095440A1 PCT/JP2022/041125 JP2022041125W WO2024095440A1 WO 2024095440 A1 WO2024095440 A1 WO 2024095440A1 JP 2022041125 W JP2022041125 W JP 2022041125W WO 2024095440 A1 WO2024095440 A1 WO 2024095440A1
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WIPO (PCT)
Prior art keywords
random access
information
terminal
signal
base station
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PCT/JP2022/041125
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English (en)
Japanese (ja)
Inventor
泰雨 李
陽介 秋元
綾介 小林
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富士通株式会社
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Priority to PCT/JP2022/041125 priority Critical patent/WO2024095440A1/fr
Publication of WO2024095440A1 publication Critical patent/WO2024095440A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/38—TPC being performed in particular situations
    • H04W52/50—TPC being performed in particular situations at the moment of starting communication in a multiple access environment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA

Definitions

  • the present invention relates to a base station, a terminal, and a wireless communication system.
  • IoT Internet of Things
  • 4G fourth generation mobile communications
  • eMBB Enhanced Mobile Broadband
  • Massive MTC Machine Type Communications
  • URLLC Ultra-Reliable and Low Latency Communication
  • a random access procedure is executed to establish uplink synchronization.
  • CBRA Contention Based Random Access
  • CFRA Contention Free Random Access
  • Non-Patent Document 29 This is a technology that expands coverage by repeatedly transmitting the PRACH.
  • 3GPP TS 36.133 V17.7.0 3GPP TS 36.211 V17.2.0 3GPP TS 36.212 V17.1.0 3GPP TS 36.213 V17.3.0 3GPP TS 36.214 V17.0.0 3GPP TS 36.300 V17.2.0 3GPP TS 36.321 V17.2.0 3GPP TS 36.322 V17.0.0 3GPP TS 36.323 V17.1.0 3GPP TS 36.331 V17.2.0 3GPP TS 37.324 V17.0.0 3GPP TS 37.340 V17.2.0 3GPP TS 38.101-2 V17.7.0 3GPP TS 38.133 V17.7.0 3GPP TS 38.201 V17.0.0 3GPP TS 38.202 V17.2.0 3GPP TS 38.211 V17.3.0 3GPP TS 38.212 V17.3.0 3GPP TS 38.213 V17.3.0 3GPP TS 38.214 V17.3.0 3GPP TS 38.
  • Repeated transmission signals other than PRACH may include PUSCH and/or PUCCH.
  • the disclosed technology has been made in consideration of the above, and aims to control repeated transmission of a random access signal, taking into consideration the effects of repeated transmission of the random access signal.
  • the random access signal may be a PRACH.
  • the random access signal may also be a signal of a random access procedure.
  • the terminal includes a receiving unit that receives a first signal including first information that limits the number of repeated transmissions of a second signal used in a random access procedure, a control unit that determines the number of transmissions of the second signal according to the first information, and a transmitting unit that transmits a predetermined number of second signals according to the number of transmissions.
  • FIG. 1 is a diagram illustrating an example of a network configuration according to the first embodiment.
  • FIG. 2 is a diagram illustrating an example of a functional block configuration of a base station in the wireless communication system according to the first embodiment.
  • FIG. 3 is a diagram illustrating an example of a functional block configuration of a terminal in the wireless communication system according to the first embodiment.
  • FIG. 4 is a diagram showing an example of an operational flow of the terminal in the first embodiment.
  • FIG. 5 is a diagram showing an example of an operation flow of the base station in the first embodiment.
  • FIG. 6 is a diagram showing an example of a process up to the completion of a random access procedure between a base station and a terminal in the second embodiment.
  • FIG. 1 is a diagram illustrating an example of a network configuration according to the first embodiment.
  • FIG. 2 is a diagram illustrating an example of a functional block configuration of a base station in the wireless communication system according to the first embodiment.
  • FIG. 3 is a diagram illustrating an example of
  • FIG. 7 is a diagram showing an example of information on the number of times a random access preamble can be repeatedly transmitted (the maximum number of times a random access preamble can be repeatedly transmitted) for each beam with respect to the value of SS-RSRP.
  • FIG. 8 is a diagram showing an example of a process up to the completion of a random access procedure between a base station and a terminal in the third embodiment.
  • FIG. 9 is a diagram showing an example of information on the number of times a transmittable random access preamble can be repeatedly transmitted (the maximum number of times a repeat transmission can be transmitted) according to the S-RSRP value and power class.
  • FIG. 10 is a diagram showing an example of an operational flow of a terminal in the fourth embodiment.
  • FIG. 11 is a diagram showing an example of a process up to the completion of a random access procedure between a base station and a terminal in the fifth embodiment.
  • FIG. 12 shows an example of information on the number of times a random access preamble can be repeatedly transmitted (the maximum number of times a random access preamble can be repeatedly transmitted) according to the value of SS-RSRP and the range of accumulated transmission power.
  • FIG. 13 is a diagram showing an example of processing up to the completion of a random access procedure between a base station and a terminal when a handover is performed in the sixth embodiment.
  • FIG. 14 is a diagram illustrating an example of a hardware configuration of a base station.
  • FIG. 15 is a diagram illustrating an example of a hardware configuration of a terminal.
  • the first problem is interference with other base stations or other cells. This is because a base station transmits a synchronization signal block (SSB: Synchronization Signal/PBCH Block) for each beam transmitted using multiple beams. The terminal then transmits PRACH in the RACH Occasion linked to the received SSB.
  • SSB Synchronization Signal/PBCH Block
  • PRACH is transmitted multiple times in the RACH Occasion linked to the received SSB. This expands the coverage range of the PRACH, and other base stations that were not affected by interference or were only slightly affected by the single transmission will experience interference from the PRACH. There is also a higher possibility that other base stations will erroneously detect the PRACH. If another base station erroneously detects the PRACH, it will carry out processing on the received PRACH.
  • the second factor is the maximum permissible exposure (MPE).
  • MPE maximum permissible exposure
  • the cumulative transmission power approaches the upper limit of the Body-SAR (Specific Absorption Rate) regulations.
  • the cumulative transmission power upper limit of the Body-SAR regulations will be exceeded.
  • it is possible to control the transmission power of the second and subsequent repeated PRACH transmissions so that it does not exceed the cumulative transmission power upper limit of the Body-SAR regulations for example, by lowering the transmission power. Since the coverage provided by the transmission power is reduced by lowering the transmission power, the effect of expanding coverage that comes with repeated transmissions cannot be fully enjoyed.
  • Non-Patent Document 13 a method of voluntary reduction of transmission power using the P-MRP (Power Management Maximum Power Reduction) framework is specified in Non-Patent Document 13.
  • the maximum transmission power differs for each power class.
  • the maximum equivalent isotropic radiated power (EIRP) is 55 dBm
  • the maximum EIRP is 43 dBm. Therefore, when transmitting PRACH, depending on the power class, repeated transmission may be performed even when repeated transmission is not necessary.
  • the base station knows the terminal capabilities (UE Capability) including the terminal's power class, but random access may be performed without the base station receiving the terminal capability information.
  • the terminal capability information (UE Capability) may be sent from the terminal to the base station after the random access procedure. For example, when the terminal is started up, the terminal capability information (UE Capability) is sent after the random access procedure is completed.
  • the wireless communication system 1 includes a base station 100 and a terminal 200.
  • the base station 100 forms a cell C10.
  • the terminal 200 is present within the cell C10.
  • the base station 100 may be, for example, a small radio base station such as a macro radio base station or a pico radio base station (including a micro radio base station, a femto radio base station, etc.), or a radio base station of various scales, and may be described in other words as a wireless communication device, a communication device, a transmitting device, etc.
  • the terminal 200 may be, for example, a wireless terminal such as a mobile phone, a smartphone, a PDA (Personal Digital Assistant), a personal computer, a vehicle, or any other device or equipment (sensor device, etc.) having a wireless communication function, and may be described in other words as a wireless communication device, a communication device, a receiving device, a mobile station, etc.
  • the base station 100 is connected to a network device (upper device or another base station) not shown in the figure via a wired connection. Note that the base station 100 may also be connected to the network device wirelessly instead of via a wired connection.
  • the base station 100 may be configured as separate devices, with the wireless communication function with the terminal 200 and the digital signal processing and control functions.
  • the device with the wireless communication function may be called an RRH (Remote Radio Head), and the device with the digital signal processing and control functions may be called a BBU (Base Band Unit).
  • the RRH may be installed extending from the BBU, and may be connected by wire with optical fiber or the like. Alternatively, they may be connected wirelessly.
  • the base station 100 may be separated into, for example, a Central Unit (CU) and a Distributed Unit (DU).
  • the DU includes at least an RF radio circuit, but may also have a wireless physical layer (or layer 1) function, a MAC (Media Access Control) layer function, and an RLC layer function.
  • the terminal 200 communicates with the base station 100 via wireless communication.
  • the base station 100 transmits SIBs such as MIB (Master Information Block) and SIB1 (System Information Block 1) to the terminal 200.
  • the terminal 200 also transmits a signal of a random access procedure (e.g., PRACH) to the base station 100.
  • the base station 100 also transmits a signal of a random access procedure (e.g., a random access response) to the terminal 200.
  • the SIB may include system information blocks such as SIB1, SIB2, SIB3, and SIBX.
  • the index X that distinguishes the SIBs may be an integer.
  • the base station 100 has a wireless communication unit 110, a control unit 120, a storage unit 130, and a communication unit 140.
  • the wireless communication unit 110 is composed of a transmission unit 111 and a reception unit 112, and performs wireless communication with the terminal 200. Specifically, the transmission unit 111 transmits downstream signals, such as random access procedure signals, RRC (Radio Resource Control) layer signals, downstream data signals, and downstream control signals, to the terminal 200.
  • downstream signals such as random access procedure signals, RRC (Radio Resource Control) layer signals, downstream data signals, and downstream control signals.
  • the receiver 112 can also receive upstream signals transmitted from the terminal 200, such as random access procedure signals, RRC layer signals, upstream data signals, and upstream control signals.
  • upstream signals transmitted from the terminal 200 such as random access procedure signals, RRC layer signals, upstream data signals, and upstream control signals.
  • the control unit 120 controls the base station 100. Specifically, the control unit 120 can control the implementation of random access procedures, the establishment of an RRC connection with the terminal 200, signal processing of signals received by the receiving unit 112, the creation of transmission blocks (TBs (Transport Blocks)), mapping of transmission blocks to radio resources, etc.
  • TBs Transmission Blocks
  • the memory unit 130 can store, for example, downstream data signals.
  • the communication unit 140 connects to a network device (e.g., a higher-level device, another base station device) via wired or wireless communication and communicates with the network device.
  • a network device e.g., a higher-level device, another base station device
  • the data signal received by the communication unit 140 and intended for the terminal 200 can be stored in the memory unit 130.
  • FIG. 3 is a diagram showing an example of a functional block configuration of the terminal 200 in the wireless communication system of the first embodiment.
  • the terminal 200 includes a communication unit 210, a control unit 220, and a storage unit 230. These components are connected so as to enable input and output of signals and data in one direction or two directions.
  • the communication unit 210 can be described separately as a transmission unit 211 and a reception unit 212.
  • the transmitter 211 transmits data signals and control signals by wireless communication via an antenna. Note that the antenna may be common for both transmission and reception.
  • the transmitter 211 transmits upstream signals such as random access procedure signals, RRC layer signals, upstream data signals, and upstream control signals, for example.
  • the receiver 212 receives downstream signals, such as random access procedure signals, downstream data signals, and downstream control signals, transmitted from the base station 100.
  • the received signals may also include reference signals used for channel estimation and demodulation, for example.
  • the control unit 220 controls the terminal 200. Specifically, the control unit 220 can control the implementation of a random access procedure, the establishment of an RRC connection with the base station 100, signal processing of signals received by the receiving unit 212, the creation of a transmission block (TB), mapping of the transmission block to radio resources, etc.
  • the storage unit 230 can store, for example, uplink data signals.
  • the storage unit 230 can also store configuration information (or setting information) related to wireless communication transmitted from the base station 100.
  • FIG. 4 is a diagram showing an example of the operation flow of the terminal 200.
  • the receiver 212 of the terminal 200 receives the first signal transmitted from the base station 100, which includes information for controlling the number of repeated transmissions of the second signal used in random access (step S10).
  • the information for controlling the number of repeated transmissions of the second signal used in random access includes at least one of the following information: the number of repeated transmissions, the maximum number of repeated transmissions, information indicating the relationship between the accumulated transmission power and the number of repeated transmissions, and information for controlling the number of repeated transmissions according to the power class.
  • the control unit 220 of the terminal 200 determines the number of times to repeatedly transmit the second signal according to the information that controls the number of times to repeatedly transmit the second signal used in the received random access (step S12).
  • the transmitter 211 of the terminal 200 transmits the second signal according to the determined number of repeated transmissions. For example, if the number of repeated transmissions is 1, the second signal is transmitted once, and if the number of repeated transmissions is 2, the second signal is transmitted twice (step S14).
  • FIG. 5 is a diagram showing an example of the operation flow of the base station 100.
  • the transmitter 111 of the base station 100 transmits a first signal including information for controlling the number of repeated transmissions of the second signal used in random access (step S20).
  • the information for controlling the number of repeated transmissions of the second signal used in random access includes at least one of information on the maximum number of repeated transmissions, information indicating the relationship between the accumulated transmission power and the number of repeated transmissions, and information for controlling the number of repeated transmissions according to the power class, for example.
  • the information for controlling the number of repeated transmissions of the second signal used in random access is generated by, for example, the controller 120.
  • the receiving unit 112 of the base station 100 receives a predetermined number of second signals determined according to information that controls the number of repeated transmissions of the second signal used by the terminal 200 for random access (step S22).
  • the control unit 120 of the base station 100 performs processing on the predetermined number of second signals (step S24). Specifically, the control unit 120 decodes the information contained in the predetermined number of second signals, and generates a response signal for the second signal. Then, the transmission unit 111 transmits the generated response signal.
  • the base station 100 notifies the terminal 200 of information for controlling the number of repeated transmissions of the second signal used in random access, using the first signal, which is a signal that can be transmitted before the base station 100 performs the random access procedure.
  • the terminal 200 determines the number of repeated transmissions of the second signal according to the information for controlling the number of repeated transmissions of the second signal used in random access. By controlling in this manner, it is possible to control the repeated transmission of the random access signal, taking into account the effects, etc., associated with the repeated transmission of the random access signal.
  • the base station 100 notifies the terminal 200 of information controlling the number of repeated transmissions of the second signal used in random access by using a first signal, which is a signal that can be transmitted before the random access procedure is performed, and the terminal 200 determines the number of repeated transmissions of the second signal according to the information controlling the number of repeated transmissions of the second signal used in random access.
  • a first signal which is a signal that can be transmitted before the random access procedure is performed
  • the terminal 200 determines the number of repeated transmissions of the second signal according to the information controlling the number of repeated transmissions of the second signal used in random access.
  • a specific example of the first embodiment will be described. Note that in the second embodiment, the wireless communication system, base station, and terminal are the same as those in the first embodiment, and therefore description thereof will be omitted.
  • FIG. 6 is a diagram showing an example of the process up to the completion of the random access procedure between the base station 100 and the terminal 200 in the second embodiment. Note that the random access procedure shown in FIG. 6 shows a four-step contention-type random access procedure.
  • the transmitting unit 111 of the base station 100 transmits information for controlling the number of repeated transmissions of the PRACH or the random access preamble using the SIB (step S30).
  • the SIB is a signal or message transmitted before transmitting a signal of the random access procedure, and is an example of a first signal.
  • the SIB may be SIB1.
  • the base station 100 may use an SIB other than the MIB or SIB1 instead of the SIB1.
  • the base station 100 may also notify the terminal 200 of information for controlling the number of repeated transmissions of the PRACH or the random access preamble by combining two or more of a plurality of SIBs including the MIB and SIB1.
  • the SIB including the MIB and SIB1 is a signal or message including information to be shared, for example, with the terminal 200 in the cell C10 of the base station 100, transmitted using a logical channel of the BCCH (Broadcast Control CHannel).
  • BCCH is a broadcast channel for broadcast information.
  • the terminal 200 receives information for controlling the number of repeated transmissions of the random access preamble (step S30). Then, when starting a contention-based random access procedure, the terminal 200 determines the number of repeated transmissions of the random access preamble in accordance with the information for controlling the number of repeated transmissions of the random access preamble (step S40). Note that the information for controlling the number of repeated transmissions of the random access preamble is an example of information for controlling the number of repeated transmissions of the second signal used in random access.
  • the terminal 200 selects a RACH Occasion linked to an SSB included in the beam transmitted from the base station 100.
  • a RACH Occasion linked to an SSB included in the beam transmitted from the base station 100 there are multiple beams transmitted from the base station 100 within the cell C10 that is formed, and for example, eight beams are transmitted in sequence within the cell C10. Note that these eight beams are each emitted in a different direction from the base station. Also, the number of beams is an example and is not limited to this.
  • the terminal 200 determines the number of times to repeatedly transmit the random access preamble according to the SSB corresponding to the selected RACH Occasion and the information that controls the number of times to repeatedly transmit the random access preamble.
  • base station 100 includes information on the maximum number of times that a random access preamble can be repeatedly transmitted for each beam in the information that controls the number of times that a random access preamble is repeatedly transmitted.
  • the base station 100 may include information on the maximum number of times that a random access preamble can be repeatedly transmitted according to the value of SS-RSRP (Synchronization Signal based-Reference Signal Received Power) in the information for controlling the number of times that a random access preamble can be repeatedly transmitted, instead of information on the maximum number of times that a random access preamble can be repeatedly transmitted for each beam.
  • SS-RSRP Synchronization Signal based-Reference Signal Received Power
  • the number of times that a random access preamble can be repeatedly transmitted is controlled according to the SS-RSRP measured by the control of the control unit 220 of the terminal 200, so that the terminal 200 can suppress the number of times that a random access preamble is repeatedly transmitted more than necessary.
  • the terminal 200 can reduce interference with other base stations due to the repetition of the random access preamble.
  • the control unit 220 of the terminal 200 may determine the number of times that the second signal is transmitted according to the maximum number of times that a random access preamble can be repeatedly transmitted, which is the reference, and the value of SS-RSRP. Even in this way, the terminal 200 can limit the number of times the random access preamble is repeatedly transmitted according to the SS-RSRP.
  • the information for controlling the number of times the random access preamble is repeatedly transmitted may include information on the maximum number of times the random access preamble can be repeatedly transmitted for each beam in accordance with the value of SS-RSRP.
  • the terminal 200 can determine the maximum number of times the random access preamble can be repeatedly transmitted for each beam in accordance with the SS-RSRP.
  • Figure 7 shows an example of information on the number of repeated transmissions of a random access preamble that can be transmitted for each beam (maximum number of repeated transmissions) for each SS-RSRP value.
  • the maximum number of times that the random access preamble can be repeatedly transmitted is S1, S2, and S3.
  • S1 to S3 are constants, and S1 is equal to or greater than S2, and S2 is equal to or greater than S3.
  • the maximum number of times that the random access preamble can be repeatedly transmitted is T1, T2, and T3.
  • T1 to T3 are constants, and T1 is equal to or greater than T2, and T2 is equal to or greater than T3.
  • the number of times (maximum number of times) the random access preamble can be repeatedly transmitted is U1, U2, and U3.
  • U1 to U3 are constants, U1 is greater than or equal to U2, and U2 is greater than or equal to U3.
  • the information on the relationship between the indexes and SS-RSRP described in FIG. 7 may be transmitted from the base station 100 to the terminal 200, or the information on the relationship between the indexes and SS-RSRP described in FIG. 7 may be pre-defined in the base station 100 and the terminal 200, and the base station 100 may notify the terminal 200 of the corresponding index in the first signal.
  • the base station 100 may notify the terminal 200 for each beam, or may notify all beams together with the same index.
  • the base station 100 may also notify the terminal 200 of beams that use the same index together.
  • the transmitter 211 of the terminal 200 determines a predetermined number, which is the number of times to repeatedly transmit the random access preamble, by the control unit 220, and then repeatedly transmits the determined predetermined number of random access preambles (step S50). For example, if the predetermined number is 2, the terminal 200 transmits the random access preamble (or message 1) twice.
  • the random access preamble (or message 1) is an example of a second signal.
  • the receiver 112 of the base station 100 receives a predetermined number of random access preambles (step S50). Then, the transmitter 111 of the base station 100 transmits a random access response (or message 2) for the received random access preambles to the terminal 200 (step S60).
  • the controller 120 of the base station 100 adds up the reception power of the predetermined number of random access preambles, and detects a random access preamble when the added reception power exceeds a predetermined value.
  • the receiver 212 of the terminal 200 receives the random access response (step S60). Then, the transmitter 211 of the terminal 200 transmits a schedule transmission (or message 3) according to the information included in the random access response (step S70).
  • the receiver 112 of the base station 100 receives the schedule transmission (or message 3) (step S70). Then, the transmitter 111 of the base station 100 transmits a contention resolution (or message 4) for the received random access preamble to the terminal 200 (step S80).
  • the base station 100 can control the number of times that the PRACH or random access preamble, which is a signal of the random access procedure, is repeatedly transmitted by transmitting information that controls the number of times that the PRACH or random access preamble is repeatedly transmitted using the MIB or SIB, which is a signal that can be transmitted before the random access procedure is performed.
  • the base station 100 transmits information that controls the number of times that the message A (Msg A), which includes the random access preamble, using the MIB or SIB, which is a signal that can be transmitted before the random access procedure is performed.
  • the base station 100 may transmit information for controlling the number of repeated transmissions of the PRACH or the random access preamble in a random access preamble assignment (or message 0), which is a signal (or message) before transmitting the random access preamble.
  • the random access preamble assignment (or message 0) is an example of a first signal.
  • the base station 100 may directly indicate the number of repeated transmissions of a random access preamble to the terminal 200.
  • the terminal 200 transmits the second signal with the instructed number of repeated transmissions set as a predetermined number.
  • the base station 100 may notify the terminal 200 of information for controlling the number of repeated transmissions of the PRACH or random access preamble by combining the MIB or SIB with the random access preamble assignment.
  • the base station 100 sets the maximum number of repeated transmissions for the random access preamble or a preamble set including multiple random access preambles in the MIB or SIB, and instructs the terminal 200 on the random access preamble in the random access preamble assignment. In this way, the base station 100 can control the number of consecutive transmissions of the random access preamble transmitted from the terminal 200.
  • a similar method may be applied to a two-step non-contention type random access procedure.
  • the base station 100 notifies the terminal 200 of information for controlling the number of repeated transmissions of the second signal used in random access by using the first signal, which is a signal that can be transmitted before the base station 100 performs the random access procedure. Then, the terminal 200 determines the number of repeated transmissions of the second signal according to the information for controlling the number of repeated transmissions of the second signal used in random access. By controlling in this manner, the terminal 200 and/or the base station 100 can control the repeated transmission of the random access signal, taking into account the effects, etc., associated with the repeated transmission of the random access signal.
  • the base station 100 notifies the terminal 200 of information for controlling the number of repeated transmissions of the second signal used in random access by using a first signal, which is a signal that can be transmitted before the random access procedure is performed, and the terminal 200 determines the number of repeated transmissions of the second signal according to the information for controlling the number of repeated transmissions of the second signal used in random access.
  • a first signal which is a signal that can be transmitted before the random access procedure is performed
  • the terminal 200 determines the number of repeated transmissions of the second signal according to the information for controlling the number of repeated transmissions of the second signal used in random access.
  • a specific example of the first embodiment was described.
  • control of the number of repeated transmissions of the second signal according to the power class of the terminal is described.
  • the wireless communication system, base station, and terminal are the same as those in the first and second embodiments, so the description is omitted.
  • the third embodiment may be appropriately combined with the first and second embodiments as long as there is no contradiction.
  • FIG. 8 is a diagram showing an example of the process up to the completion of the random access procedure between the base station 100 and the terminal 200 in the third embodiment. Note that in FIG. 8, the same reference numerals are used for the same contents as in FIG. 6, and the description will be omitted.
  • the transmitting unit 111 of the base station 100 transmits information for controlling the number of times the PRACH or the random access preamble is repeatedly transmitted via the SIB (step S32).
  • the information for controlling the number of times the PRACH or the random access preamble is repeatedly transmitted includes information on the maximum number of times the transmission is repeatedly transmitted for each power class.
  • the information for controlling the number of times the random access preamble is repeatedly transmitted is an example of information for controlling the number of times the second signal used in random access is repeatedly transmitted.
  • the terminal 200 receives information for controlling the number of times the random access preamble is repeatedly transmitted (step S32). Then, when starting a contention-based random access procedure, the terminal 200 determines the number of times the random access preamble is repeatedly transmitted according to the information for controlling the number of times the random access preamble is repeatedly transmitted and the power class of the terminal 200 (step S42).
  • the information for controlling the number of repeated transmissions of the random access preamble includes first information, which is information on the maximum number of repeated transmissions for the first power class, and second information, which is information on the maximum number of repeated transmissions for the second power class.
  • the maximum transmission power of the first power class is higher than the maximum transmission power of the second power class.
  • the first power class is, for example, power class 1.
  • the second power class is, for example, power class 3.
  • the maximum transmission power of power class 1 may be approximately 35 dBm.
  • the maximum transmission power of power class 3 may be approximately 23 dBm (see non-patent document 13).
  • step S42 the control unit 220 of the terminal 200 checks the power class of the terminal 200. For example, if the power class of the terminal 200 is the first power class, the control unit 220 of the terminal 200 uses the first information to determine the number of times to repeatedly transmit the random access preamble. Also, if the power class of the terminal 200 is the second power class, the control unit 220 of the terminal 200 uses the second information to determine the number of times to repeatedly transmit the random access preamble.
  • the base station 100 does not need to include information for each of the multiple power classes in the information that controls the number of times the random access preamble is repeatedly transmitted.
  • the number of pieces of power class information included in the information that controls the number of times the random access preamble is repeatedly transmitted may be less than or equal to the number of power classes. For example, in the case of two power classes, a single piece of information may be sufficient.
  • the terminal 200 sets one of the multiple power classes as the reference power class.
  • the control unit 220 then multiplies or divides the reference power class by a predetermined constant (N) to determine the maximum number of repeated transmissions of the random access preamble for the other power classes.
  • the information controlling the number of repeated transmissions of the random access preamble includes a first number (M) which is information on the maximum number of repeated transmissions
  • the first number (M) multiplied by a predetermined constant (N) is N x M, which is the maximum number of repeated transmissions of the random access preamble of the second power class.
  • the information controlling the number of repeated transmissions of the random access preamble includes a second number (L) which is information on the maximum number of repeated transmissions
  • the second number (L) divided by a predetermined constant (N) (L ⁇ N) becomes the maximum number of repeated transmissions of the random access preamble of the first power class.
  • the base station 100 may also include information on the maximum number of times a random access preamble can be repeatedly transmitted for each power class in relation to the value of the SS-RSRP in the information that controls the number of times a random access preamble is repeatedly transmitted, to determine the number of times the random access preamble is repeatedly transmitted.
  • Figure 9 shows an example of information on the number of times a random access preamble can be repeatedly transmitted (maximum number of times) depending on the SS-RSRP value and power class.
  • FIG. 9A shows an example in which the value of SS-RSRP is set for each of the first power class and the second power class.
  • the number of repeated transmissions of the random access preamble that can be transmitted is M1, M2, and M3.
  • M1 to M3 are constants, and M1 is equal to or greater than M2, and M2 is equal to or greater than M3.
  • the number of repeated transmissions of the random access preamble that can be transmitted is L1, L2, and L3.
  • L1 to L3 are constants, L1 is greater than or equal to L2, and L2 is greater than or equal to L3.
  • FIG. 9B shows a first example in which the second power class is the reference power class, and an example in which the value of SS-RSRP is set for the second power class.
  • the second power class when the SS-RSRP is less than -100 dBm, greater than or equal to -100 dBm and less than -90 dBm, and greater than or equal to -90 dBm, the number of repeated transmissions of the random access preamble that can be transmitted (maximum number of repeated transmissions) is L1, L2, and L3, respectively.
  • L1 to L3 are constants, L1 is greater than or equal to L2, and L2 is greater than or equal to L3.
  • the number of repeated transmissions (maximum number of repeated transmissions) of a random access preamble that can be transmitted according to the SS-RSRP for the first power class is L1/N, L2/N, and L3/N when the SS-RSRP is less than -100 dBm, -100 dBm or more and less than -90 dBm, and -90 dBm or more, respectively. Note that decimals may be rounded down or up.
  • FIG. 9C shows a second example in which the second power class is the reference power class, and an example in which the value of SS-RSRP is set for the second power class.
  • the number of repeated transmissions of the transmittable random access preamble is L in all cases where the SS-RSRP is less than -100 dBm, greater than or equal to -100 dBm and less than -90 dBm, and greater than or equal to -90 dBm.
  • the number of repeated transmissions (maximum number of repeated transmissions) of a random access preamble that can be transmitted according to the SS-RSRP for the first power class is L/N1, L/N2, and L/N3 when the SS-RSRP is less than -100 dBm, -100 dBm or more and less than -90 dBm, and -90 dBm or more, respectively.
  • the decimal point may be rounded down or up.
  • the base station 100 can control the maximum number of repeated transmissions of the random access preamble using the reference power class and a specified value by changing a specified constant as shown in Figure 9C.
  • the base station 100 may directly indicate the number of times the random access preamble is repeatedly transmitted to the terminal 200. Even in this case, the contents described above can be applied.
  • It can also be adapted to a two-step contention-based random access procedure, a four-step non-contention-based random access procedure, and a two-step non-contention-based random access procedure.
  • the base station 100 can control the number of times the random access preamble is repeatedly transmitted according to the power class of the terminal 200 by including information for controlling the number of times the random access preamble is repeatedly transmitted for each power class in the information for controlling the number of times the second signal is repeatedly transmitted for use in random access and notifying the terminal 200 of the information.
  • the base station 100 notifies the terminal 200 of the information controlling the number of repeated transmissions of the random access preamble for each power class, which is included in the information controlling the number of repeated transmissions of the second signal used in random access, in the first signal, which is a signal that can be transmitted before the base station 100 performs the random access procedure.
  • the terminal 200 determines the number of repeated transmissions of the second signal according to the information controlling the number of repeated transmissions of the second signal used in random access.
  • the base station 100 and/or the terminal 200 can control the repeated transmission of the random access signal, taking into account the effects, etc., associated with the repeated transmission of the random access signal.
  • the base station 100 notifies the terminal 200 of information for controlling the number of repeated transmissions of the second signal used in random access by using a first signal, which is a signal that can be transmitted before the random access procedure is performed, and the terminal 200 determines the number of repeated transmissions of the second signal according to the information for controlling the number of repeated transmissions of the second signal used in random access.
  • a first signal which is a signal that can be transmitted before the random access procedure is performed
  • the terminal 200 determines the number of repeated transmissions of the second signal according to the information for controlling the number of repeated transmissions of the second signal used in random access.
  • a specific example of the first embodiment was described.
  • control of the number of repeated transmissions of the second signal according to the power class of the terminal was described.
  • an example of autonomous control in the terminal is described.
  • the wireless communication system, base station, and terminal are the same as those in the first to third embodiments, and therefore description thereof will be omitted. Also, the fourth embodiment may be appropriately combined with the first to third embodiments within a range that does not contradict them.
  • FIG. 10 is a diagram showing an example of the operation flow of the terminal in the fourth embodiment. Note that FIG. 10 can be applied to step S12 in FIG. 4 described in the first embodiment, step S40 in FIG. 6 described in the second embodiment, or step S42 described in the third embodiment.
  • the control unit 220 of the terminal 200 determines whether transmission is required at a predetermined transmission power or less (for example, whether transmission is required at a power less than the maximum transmission power or at 80% or less of the maximum transmission power) (step S90).
  • the predetermined transmission power may be less than the maximum transmission power, a predetermined percentage of the maximum transmission power, or transmission power to which P-MPR is applied. The predetermined percentage may be a percentage less than 100 percent.
  • the control unit 220 of the terminal 200 makes a judgment according to the accumulated transmission power of the terminal 200.
  • the accumulated transmission power is the accumulated transmission power in a predetermined period, and the predetermined period is, for example, 6 minutes.
  • step S90 If there is no need to transmit at or below the specified transmission power (step S90: No), proceed to step S94.
  • step S90 If transmission is required at or below the specified transmission power (step S90: Yes), the control unit 220 of the terminal 200 changes the maximum transmission power to the specified transmission power (step S91).
  • the control unit 220 of the terminal 200 determines whether it is necessary to change the upper limit of the number of repeated transmissions (step S92). This may be because the upper limit of the number of repeated transmissions may be set according to the maximum transmission power, the maximum transmission power may have been reduced to a predetermined power, or the upper limit of the number of repeated transmissions may be able to be increased.
  • step S92 If there is no need to change the upper limit on the number of repeated transmissions (step S92: No), proceed to step S94.
  • step S92 If it is necessary to change the upper limit of the number of repeated transmissions (step S92: Yes), the control unit 220 of the terminal 200 changes the upper limit of the number of repeated transmissions (step S93) and proceeds to step S94.
  • the control unit 220 of the terminal 200 determines the number of times to transmit the second signal depending on the upper limit of the number of repeated transmissions, the maximum transmission power, and the accumulated transmission power of the terminal 200 (step S94).
  • step S94 the control unit 220 of the terminal 200 controls transmission so that the number of repeated transmissions is less than the instructed number of repeated transmissions, even if the number of repeated transmissions is instructed by the base station 100, according to the accumulated transmission power.
  • the terminal 200 and/or the base station 100 can control the number of repeated transmissions and the transmission power, taking into account the cumulative transmission power of the terminal 200. This allows the terminal 200 and/or the base station 100 to comply with the regulations on cumulative transmission power.
  • control unit 220 of the terminal 200 can improve coverage within a specific range by setting the maximum transmission power (or transmission power) to a predetermined transmission power and increasing the number of repeated transmissions.
  • the directly indicated number of repeated transmissions may be corrected by applying the above method.
  • step S90 if the terminal 200 needs to transmit a random access preamble at a predetermined transmission power or less, the terminal 200 may set the number of repeated transmissions of the random access preamble to 1. In other words, the terminal 200 does not need to repeatedly transmit the random access preamble.
  • the terminal 200 controls the number of repeated transmissions of the second signal used in random access, taking into account the accumulated transmission power.
  • the terminal 200 and/or the base station 100 can control the repeated transmission of the random access signal, taking into account the effects, etc., associated with the repeated transmission of the random access signal.
  • the base station 100 notifies the terminal 200 of information for controlling the number of repeated transmissions of the second signal used in random access by using a first signal, which is a signal that can be transmitted before the random access procedure is performed, and the terminal 200 determines the number of repeated transmissions of the second signal according to the information for controlling the number of repeated transmissions of the second signal used in random access.
  • a first signal which is a signal that can be transmitted before the random access procedure is performed
  • the terminal 200 determines the number of repeated transmissions of the second signal according to the information for controlling the number of repeated transmissions of the second signal used in random access.
  • a specific example of the first embodiment was described.
  • control of the number of repeated transmissions of the second signal according to the power class of the terminal was described.
  • an example of autonomous control in the terminal was described.
  • control of the number of repeated transmissions of the second signal according to the accumulated transmission power of the terminal is described.
  • the wireless communication system, the base station, and the terminal are the same as those in the first to fourth embodiments, and therefore description thereof will be omitted.
  • the fifth embodiment may be appropriately combined with the first to fourth embodiments within a range that does not contradict them.
  • FIG. 11 is a diagram showing an example of the process up to the completion of the random access procedure between the base station 100 and the terminal 200. Note that in FIG. 11, the same reference numerals are used for the same contents as in FIG. 6 or FIG. 8, and the description thereof will be omitted.
  • the transmitter 111 of the base station 100 transmits information for controlling the number of repeated transmissions of the PRACH or the random access preamble using the SIB (step S34).
  • the information for controlling the number of repeated transmissions of the PRACH or the random access preamble includes information on the number of repeated transmissions that can be transmitted for each accumulated transmission power of the terminal 200.
  • the SIB may be SIB1.
  • the information for controlling the number of repeated transmissions of the random access preamble is an example of information for controlling the number of repeated transmissions of the second signal used in random access.
  • the terminal 200 receives information for controlling the number of times the random access preamble is repeatedly transmitted (step S34). Then, when the terminal 200 starts a contention-based random access procedure, the terminal 200 determines the number of times the random access preamble is repeatedly transmitted according to the information for controlling the number of times the random access preamble is repeatedly transmitted and the accumulated transmission power of the terminal 200 (step S44).
  • the information for controlling the number of repeated transmissions of the random access preamble includes, for example, first information which is information on the maximum number of repeated transmissions for the first range of accumulated transmission power, second information which is information on the maximum number of repeated transmissions for the second range of accumulated transmission power, third information which is information on the maximum number of repeated transmissions for the first range of accumulated transmission power, and fourth information which is information on the maximum number of repeated transmissions for the fourth range of accumulated transmission power.
  • the first range is a ratio of the actual cumulative transmission power to the cumulative transmission power upper limit that is 0% or more and less than 30%
  • the second range is a ratio of the actual cumulative transmission power to the cumulative transmission power upper limit that is 30% or more and less than 60%
  • the third range is a ratio of the actual cumulative transmission power to the cumulative transmission power upper limit that is 60% or more and less than 90%
  • the fourth range is a ratio of the actual cumulative transmission power to the cumulative transmission power upper limit that is 90% or more.
  • step S44 the control unit 220 of the terminal 200 checks the accumulated transmission power (actual accumulated transmission power) of the terminal 200. For example, if the accumulated transmission power of the terminal 200 is 50% of the accumulated transmission power upper limit, the control unit 220 of the terminal 200 determines the number of repeated transmissions of the random access preamble according to the second information, which is information on the number of repeated transmissions that can be transmitted corresponding to the second range.
  • the second information is information on the number of repeated transmissions that can be transmitted corresponding to the second range.
  • the base station 100 may also control the number of repeated transmissions of the random access preamble to be determined by including information on the number of repeated transmissions of the random access preamble that can be transmitted (the maximum number of repeated transmissions) for each range of accumulated transmission power and the value of SS-RSRP in the information for controlling the number of repeated transmissions of the random access preamble.
  • the terminal 200 may determine the number of repeated transmissions by including information on the number of repeated transmissions of the random access preamble that can be transmitted (the maximum number of repeated transmissions) for each range of the accumulated transmission power and the value of the SS-RSRP in the information that controls the number of repeated transmissions of the random access preamble.
  • FIG. 12 shows an example of information on the number of times a random access preamble can be repeatedly transmitted (maximum number of times) depending on the SS-RSRP value and the range of accumulated transmission power.
  • FIG. 12 shows an example in which the value of SS-RSRP is set for each of the first, second, third, and fourth ranges.
  • the first range when the SS-RSRP is less than -100 dBm, at least -100 dBm and less than -90 dBm, and at least -90 dBm, the number of repeated transmissions of the random access preamble that can be transmitted (or the maximum number of repeated transmissions) is A1, A2, and A3.
  • A1 to A3 are constants, and A1 is equal to or greater than A2, and A2 is equal to or greater than A3.
  • the number of repeated transmissions of the random access preamble that can be transmitted (the maximum number of repeated transmissions) is B1, B2, and B3.
  • B1 to B3 are constants, B1 is equal to or greater than B2, and B2 is equal to or greater than B3.
  • the number of repeated transmissions of the transmittable random access preamble is C1, C2, and C3.
  • C1 to C3 are constants, C1 is equal to or greater than C2, and C2 is equal to or greater than C3.
  • the number of repeated transmissions of the transmittable random access preamble (the maximum number of repeated transmissions) is D1, D2, and D3.
  • D1 to D3 are constants, D1 is greater than or equal to D2, and D2 is greater than or equal to D3.
  • A1 is greater than or equal to B1, B1 is greater than or equal to C1, and C1 is greater than or equal to D1.
  • A2 is greater than or equal to B2, B2 is greater than or equal to C2, and C2 is greater than or equal to D2.
  • A3 is greater than or equal to B3, B3 is greater than or equal to C3, and C3 is greater than or equal to D3.
  • the control unit 220 of the terminal 200 may determine the number of times to repeatedly transmit the random access preamble for each range from the reference range. In this case, the control unit 220 of the terminal 200 may multiply or divide the reference range by a predetermined constant (N) to determine the number of times to repeatedly transmit the random access preamble for other ranges.
  • N predetermined constant
  • the base station 100 can control the number of times the random access preamble is repeatedly transmitted according to the accumulated transmission power of the terminal 200 by notifying the terminal 200 of the information controlling the number of times the second signal is repeatedly transmitted, including information controlling the number of times the random access preamble is repeatedly transmitted for each range of accumulated transmission power.
  • the terminal 200 can determine the number of times to repeatedly transmit the random access preamble according to the accumulated transmission power of the terminal 200 by including information to control the number of times to repeatedly transmit the random access preamble for each range of accumulated transmission power in the information to control the number of times to repeatedly transmit the second signal used in random access and notifying the terminal 200 of the information.
  • information on the range of accumulated transmission power for each power class may be set for each index.
  • information on the range of accumulated transmission power for each power class may be set.
  • the base station 100 may directly indicate the number of repeated transmissions of a random access preamble to the terminal 200. Even in this case, the terminal 200 may adapt the directly indicated number of repeated transmissions to the above method and correct it.
  • It can also be adapted to a two-step contention-based random access procedure, a four-step non-contention-based random access procedure, and a two-step non-contention-based random access procedure.
  • the base station 100 notifies the terminal 200 of the information controlling the number of repeated transmissions of the random access preamble for each range of accumulated transmission power, including information controlling the number of repeated transmissions of the second signal used in random access, in the first signal, which is a signal that can be transmitted before the base station 100 performs the random access procedure.
  • the terminal 200 determines the number of repeated transmissions of the second signal according to the information controlling the number of repeated transmissions of the second signal used in random access.
  • the terminal 200 and/or the base station 100 can control the repeated transmission of the random access signal, taking into account the effects of repeated transmission of the random access signal, etc.
  • the base station 100 notifies the terminal 200 of information for controlling the number of repeated transmissions of the second signal used in random access by using a first signal, which is a signal that can be transmitted before the base station 100 performs a random access procedure, and the terminal 200 determines the number of repeated transmissions of the second signal according to the information for controlling the number of repeated transmissions of the second signal used in random access.
  • the base station notifies information for controlling the number of repeated transmissions of the second signal used in random access by using a message such as an SIB or an MIB, and the control of the number of repeated transmissions of the second signal in the terminal 200 was described.
  • the processing at the time of handover is described.
  • the base station and the terminal are the same as those in the first to fifth embodiments, and therefore the description is omitted.
  • the sixth embodiment may be appropriately combined with the first to fifth embodiments within a range that does not contradict.
  • FIG. 13 is a diagram showing an example of the processing up to the completion of the random access procedure between base station 100B and terminal 200 when handover is performed. Note that in FIG. 13, the same reference numerals are used for the same contents as in FIG. 6, FIG. 8, or FIG. 11, and the description thereof will be omitted. Also, base station 100A and base station 100B have the same configuration as base station 100.
  • the communication unit 140 of the base station 100A transmits a handover request message (HANDOVER REQUEST message) to the base station 100B (step S36).
  • the communication unit 140 of the base station 100B transmits a handover acknowledgement message (HANDOVER REQUEST ACKNOWLEDGE message) in response to the handover request to the base station 100A (step S37).
  • the transmitting unit 111 of the base station 100A transmits to the terminal 200 a signal (or message) including at least information indicating the base station 100B (e.g., cell identification information) and information for controlling the number of repeated transmissions of the second signal used in random access (step S38).
  • the signal (or message) including information indicating the base station 100B (e.g., cell identification information) and information for controlling the number of repeated transmissions of the second signal used in random access is transmitted, for example, in an RRC reconfiguration message, which is a signal of the RRC layer.
  • the SIB and MIB use the BCCH as a logical channel, but the information for controlling the number of repeated transmissions of the second signal used in random access is transmitted using a message using the DCCH (Dedicated Control CHannel) as a logical channel, like the RRC reconfiguration message.
  • the information for controlling the number of times the second signal used in random access is repeatedly transmitted is an example of information for limiting the number of times the second signal used in the random access procedure is repeatedly transmitted.
  • the RRC reconfiguration message is an example of the first signal.
  • the DCCH is an individual control channel for individual control signals.
  • the terminal 200 receives information that controls the number of times the random access preamble is repeatedly transmitted (step S38). Then, when starting the random access procedure, the terminal 200 determines the number of times the random access preamble is repeatedly transmitted in accordance with the information that controls the number of times the random access preamble is repeatedly transmitted (step S46).
  • the terminal 200 transmits a predetermined number of random access preambles, which is the determined number of repeated transmissions of the random access preamble, to the base station 100B (step S52).
  • the first signal which is a signal that can be transmitted before the base station 100 performs the random access procedure
  • embodiment 6 can be combined with embodiments 1 to 5 as appropriate to the extent that no contradictions are present.
  • FIG 14 is a diagram showing an example of the hardware configuration of base station 100.
  • base station 100 has, as hardware components, an RF (Radio Frequency) circuit 320 equipped with an antenna 310, a CPU (Central Processing Unit) 330, a DSP (Digital Signal Processor) 340, a memory 350, and a network IF (Interface) 360.
  • CPU 330 is connected so as to enable input and output of various signals and data signals via a bus.
  • Memory 350 includes at least one of a RAM (Random Access Memory) such as an SDRAM (Synchronous Dynamic Random Access Memory), a ROM (Read Only Memory), and a flash memory, and stores programs, control information, and data signals.
  • RAM Random Access Memory
  • the transmitting unit 111 and the receiving unit 112 are realized by, for example, the RF circuit 320, or the antenna 310 and the RF circuit 320.
  • the control unit 120 is realized by, for example, the CPU 330, the DSP 340, the memory 350, a digital electronic circuit (not shown), etc. Examples of the digital electronic circuit include an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programming Gate Array), and an LSI (Large Scale Integration).
  • the communication unit 140 is realized by, for example, a network IF (Interface) 360.
  • Various processes in the base station 100 are realized, for example, by executing programs stored in the memory 350.
  • FIG. 15 is a diagram showing an example of the hardware configuration of the terminal 200.
  • the terminal 200 has, as hardware components, an RF circuit 420 with an antenna 410, a CPU 430, a DSP 440, and a memory 450.
  • the terminal 200 may have a display device such as an LCD (Liquid Crystal Display) connected to the CPU 430.
  • the memory 450 includes at least one of a RAM such as an SDRAM, a ROM, and a flash memory, and stores programs, control information, and data signals.
  • the transmitting unit 211 and the receiving unit 212 are realized by, for example, the RF circuit 420, or the antenna 410 and the RF circuit 420.
  • the control unit 220 is realized by, for example, the CPU 430, the DSP 440, the memory 450, a digital electronic circuit (not shown), etc. Examples of the digital electronic circuit include an ASIC, an FPGA, and an LSI.
  • a base station and a terminal In each embodiment, an example of a base station and a terminal is described, but the disclosed technology is not limited to this and can be applied to various devices such as electronic devices mounted on automobiles, trains, airplanes, artificial satellites, etc., electronic devices transported by drones, etc., robots, AV equipment, home appliances, office equipment, vending machines, and other lifestyle equipment.
  • REFERENCE SIGNS LIST 1 wireless communication system 100 base station C10 cell 110 wireless communication unit 111 transmission unit 112 reception unit 120 control unit 130 storage unit 140 communication unit 200 terminal 210 communication unit 211 transmission unit 212 reception unit 220 control unit 230 storage unit 310 antenna 320 RF circuit 330 CPU 340 DSP 350 Memory 360 Network IF 410 Antenna 420 RF circuit 430 CPU 440 DSP 450 Memory

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Un terminal selon la présente invention comprend une unité de réception, une unité de commande et une unité de transmission. L'unité de réception reçoit un premier signal qui comprend des premières informations qui limitent un compte de transmission de répétition pour un second signal qui doit être utilisé pour une procédure d'accès aléatoire. L'unité de commande détermine le nombre de transmission de répétition pour le second signal conformément aux premières informations reçues. L'unité de transmission transmet le second signal un nombre prescrit de fois qui correspond au nombre de transmission de répétition déterminé.
PCT/JP2022/041125 2022-11-04 2022-11-04 Station de base, terminal et système de communication sans fil WO2024095440A1 (fr)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017195398A1 (fr) * 2016-05-12 2017-11-16 日本電気株式会社 Terminal sans fil, station de base et procédés associés

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017195398A1 (fr) * 2016-05-12 2017-11-16 日本電気株式会社 Terminal sans fil, station de base et procédés associés

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ZTE: "Further consideration on new UE power class", 3GPP DRAFT; R2-167691 FURTHER CONSIDERATION ON NEW UE POWER CLASS, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG2, no. Reno, USA; 20161114 - 20161118, 13 November 2016 (2016-11-13), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France , XP051177510 *

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