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WO2025173344A1 - Terminal, station de base et procédé de communication - Google Patents

Terminal, station de base et procédé de communication

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Publication number
WO2025173344A1
WO2025173344A1 PCT/JP2024/041834 JP2024041834W WO2025173344A1 WO 2025173344 A1 WO2025173344 A1 WO 2025173344A1 JP 2024041834 W JP2024041834 W JP 2024041834W WO 2025173344 A1 WO2025173344 A1 WO 2025173344A1
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WO
WIPO (PCT)
Prior art keywords
dft
occ
signal
orthogonal sequence
applying
Prior art date
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Pending
Application number
PCT/JP2024/041834
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English (en)
Japanese (ja)
Inventor
哲矢 山本
秀俊 鈴木
昭彦 西尾
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Intellectual Property Corp of America
Original Assignee
Panasonic Intellectual Property Corp of America
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Application filed by Panasonic Intellectual Property Corp of America filed Critical Panasonic Intellectual Property Corp of America
Publication of WO2025173344A1 publication Critical patent/WO2025173344A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes

Definitions

  • This disclosure relates to a terminal, a base station, and a communication method.
  • the 3rd Generation Partnership Project (3GPP) an international standardization organization, is working on the specification of New Radio (NR) as one of the 5G radio interfaces.
  • NR New Radio
  • 3GPP TS38.213 V18.1.0 “NR Physical layer procedures for control (Release 18),” December 2023.
  • 3GPP TS38.214 V18.1.0 “NR Physical layer procedures for data (Release 18),” December 2023.
  • RP-234078 “New WID: Non-Terrestrial Networks (NTN) for NR Phase 3,” Huawei (Moderator, RAN1 Vice-Chair), December 2023.
  • a terminal comprises: a control circuit that determines an orthogonal sequence such that at least a portion of the frequency domain output result obtained by applying an orthogonal sequence to a signal before a Discrete Fourier Transform (DFT) and applying the DFT to the signal is mapped to a frequency resource used for a demodulation reference signal; and a transmission circuit that transmits the signal to which the orthogonal sequence has been applied.
  • a control circuit that determines an orthogonal sequence such that at least a portion of the frequency domain output result obtained by applying an orthogonal sequence to a signal before a Discrete Fourier Transform (DFT) and applying the DFT to the signal is mapped to a frequency resource used for a demodulation reference signal
  • DFT Discrete Fourier Transform
  • URLLC The basic functions of eMBB or URLLC were specified in Release 15, and from Release 16 onwards, URLLC has been extended to include Industrial IoT, Vehicle-to-Everything (V2X), and non-terrestrial networks (NTN) including satellites.
  • V2X Vehicle-to-Everything
  • NTN non-terrestrial networks
  • 3GPP's extended specifications have been called “5G-Advanced” since Release 18.
  • NR may utilize frequency bands below 6 GHz, such as the 700 MHz to 3.5 GHz band (also known as Frequency Range 1 (FR1)), which have been used for cellular communications, as well as millimeter wave bands such as the 28 GHz or 39 GHz band (also known as Frequency Range 2 (FR2)), which can ensure wide bandwidth (see, for example, Non-Patent Document 1).
  • FR1 Frequency Range 1
  • FR2 Frequency Range 2
  • FR1 Frequency Range 1
  • FR2 Frequency Range 2
  • NR uses a higher frequency band than LTE or 3G, for example, it is expected to ensure a communication area (or coverage) equivalent to that of radio access technologies (RATs) such as LTE or 3G; in other words, to ensure appropriate communication quality.
  • RATs radio access technologies
  • 3GPP Release 17 e.g., "Rel. 17”
  • Release 18 e.g., "Rel. 18”
  • NTNs non-terrestrial networks
  • HAPSs high-altitude platform stations
  • Release 18 examines NTN extension technologies and has considered improving NTN uplink coverage (see, for example, Non-Patent Document 4).
  • a terminal e.g., user equipment (UE) transmits and receives data in accordance with, for example, layer 1 control signals (e.g., DCI: Downlink Control Information) on a downlink control channel (e.g., PDCCH: Physical Downlink Control Channel) from a base station (e.g., gNB) or resource allocation indicated by layer 3 Radio Resource Control (RRC) (see, for example, non-patent documents 5 to 8).
  • layer 1 control signals e.g., DCI: Downlink Control Information
  • PDCCH Physical Downlink Control Channel
  • RRC Radio Resource Control
  • channels to which repetition can be applied are uplink data channels (e.g., PUSCH: Physical Uplink Shared Channel) scheduled by DCI format 0-1 or DCI format 0-2 (e.g., PUSCH scheduled after parameters are set by the pusch-Config information element (IE), which is a terminal-specific RRC), Msg.3 PUSCH (e.g., PUSCH scheduled by Random Access Response (RAR)), uplink control channels (e.g., PUCCH: Physical Uplink Control Channel), and random access channels (e.g., PRACH: Physical Random Access Channel).
  • PUSCH Physical Uplink Shared Channel
  • IE which is a terminal-specific RRC
  • Msg.3 PUSCH e.g., PUSCH scheduled by Random Access Response (RAR)
  • uplink control channels e.g., PUCCH: Physical Uplink Control Channel
  • random access channels e.g., PRACH: Physical Random Access Channel
  • repetition may be applied to uplink transmissions due to large propagation losses.
  • repetition increases the time and frequency resources used for communication in proportion to the number of repetitions, which can result in a decrease in communication capacity.
  • OCC Orthogonal Cover Code
  • One method for implementing OCC within an OFDM symbol is to apply OCC to the data symbol (modulated data symbol) before DFT (hereinafter referred to as "pre-DFT OCC") in Discrete Fourier Transform spreading OFDM (DFT-s-OFDM), as shown in Figure 1, and then perform DFT precoding (or spreading, transform precoding).
  • DFT-s-OFDM Discrete Fourier Transform spreading OFDM
  • SF spreading factor
  • This method has been introduced as PUCCH format 4 in existing NR (see, for example, Non-Patent Document 5).
  • PUCCH format 4 supports OCC sequence lengths of 2 or 4 (spreading factor 2 or 4, multiplexing capacity for 2 or 4 terminals). In addition, PUCCH format 4 only supports resource allocation of one resource block (RB). In addition, in PUCCH format 4, the OCC sequence to be used is provided by the PUCCH resource allocation.
  • PUSCH using DFT-s-OFDM supports Demodulation Reference Signal (DMRS) configuration Type 1.
  • DMRS configuration Type 1 has a comb structure in the frequency domain (e.g., DMRS mapping in the frequency domain).
  • the comb number (e.g., subcarrier or resource element (RE)) to which resources are assigned in the frequency domain comb structure is determined depending on the OCC sequence (e.g., OCC sequence number). Therefore, if the use of pre-DFT OCC is controlled independently of the DMRS frequency domain comb structure, there is a risk that, for example, the frequency resource (e.g., subcarrier or RE) to which PUSCH is mapped as a result of the pre-DFT OCC and DFT will not match at all with the frequency resource (e.g., subcarrier or RE) to which DMRS is mapped, resulting in degraded channel estimation performance. Therefore, when using pre-DFT OCC, it is expected that the relationship with the mapping position (e.g., comb structure) in the frequency domain of DMRS will be taken into consideration.
  • the mapping position e.g., comb structure
  • the maximum number of ports (e.g., number of multiplexes) supported in the existing DMRS configuration Type 1 is 4 for single-symbol DMRS and 8 for double-symbol DMRS.
  • the multiplexing capacity of OCC does not exceed the multiplexing capacity of DMRS, for example, in the case of DMRS configuration Type 1, it is expected that an OCC sequence length (or spreading factor, multiplexing capacity) of at least 8 will be supported in order to support as much flexible and large a multiplexing capacity as possible.
  • dynamic signaling of the OCC sequence is possible by adding a new bit field for OCC sequence signaling to the DCI, but this increases DCI overhead. In scenarios where coverage improvement is expected, it is expected that the DCI overhead will be small.
  • a non-limiting embodiment of the present disclosure describes a method for improving the transmission quality and transmission capacity of a PUSCH using a pre-DFT OCC, or a method for reducing the overhead of notifying a pre-DFT OCC sequence.
  • a communication system includes, for example, at least one base station and at least one terminal.
  • FIG. 2 is a block diagram showing an example configuration of a portion of a base station 100 according to an embodiment of the present disclosure
  • FIG. 3 is a block diagram showing an example configuration of a portion of a terminal 200 according to an embodiment of the present disclosure.
  • a control unit determines an orthogonal sequence that has a relationship such that at least a portion of the frequency domain output results obtained by applying an orthogonal sequence (pre-DFT OCC) to a pre-DFT signal and applying a DFT to the signal are mapped to frequency resources used for a demodulation reference signal (DMRS).
  • a communication unit e.g., corresponding to a receiving circuit receives a signal (e.g., PUSCH) to which the orthogonal sequence has been applied.
  • a control unit determines an orthogonal sequence that has a relationship such that at least a portion of the frequency domain output results obtained by applying an orthogonal sequence (pre-DFT OCC) to a pre-DFT signal and applying a DFT to the signal are mapped to frequency resources used for a demodulation reference signal (DMRS).
  • a communication unit e.g., corresponding to a transmission circuit transmits a signal (e.g., PUSCH) to which the orthogonal sequence has been applied.
  • the base station 100 and the terminal 200 apply (or determine or set) a pre-DFT OCC sequence in which at least a portion of the frequency domain output result obtained by applying pre-DFT OCC (OCC to the signal before DFT) and applying DFT to the signal (for example, referred to as "pre-DFT OCC and post-DFT application") is mapped to the frequency resources used for DMRS.
  • pre-DFT OCC and post-DFT application for example, referred to as "pre-DFT OCC and post-DFT application”
  • an OCC when applying a pre-DFT OCC, an OCC may be applied (or set or determined) that has a relationship between the OCC sequence number and the DMRS port such that "the output result (e.g., comb number, subcarrier or RE to which the data signal is mapped) given by the comb structure in the frequency domain after applying the pre-DFT OCC and DFT is mapped to the subcarrier (or RE) used for DMRS.”
  • the output result e.g., comb number, subcarrier or RE to which the data signal is mapped
  • the output result given by the frequency domain comb structure after applying the pre-DFT OCC and DFT will be RE numbers #0, #2, #4, #6, #8, and #10 within the RB (e.g., RE numbers #0 to #11) when OCC sequence number #0 is applied, and RE numbers #1, #3, #5, #7, #9, and #11 within the RB when OCC sequence number #1 is applied.
  • OCC sequence number #0 whose output results from the pre-DFT OCC and the frequency domain comb structure after application of the DFT can be REs #0, #2, #4, #6, #8, and #10, is mapped to the RE used for DMRS port #0, #1, #4, or #5, and can therefore be used in conjunction with DMRS port #0, #1, #4, or #5.
  • Figure 5 shows an example of applying pre-DFT OCC with an OCC sequence length of 4 (spreading factor 4).
  • the output result given by the frequency domain comb structure after applying the pre-DFT OCC and DFT will be RE numbers #0, #4, and #8 within the RB (e.g., RE numbers #0 to #11) when OCC sequence number #0 is applied, RE numbers #1, #5, and #9 within the RB when OCC sequence number #1 is applied, RE numbers #2, #6, and #10 within the RB when OCC sequence number #2 is applied, and RE numbers #3, #7, and #11 within the RB when OCC sequence number #3 is applied.
  • OCC sequence number #0 whose output results given by the pre-DFT OCC and the frequency domain comb structure after application of the DFT can be REs #0, #4, and #8, is mapped to the RE used for DMRS port #0, #1, #4, or #5, and can therefore be used in conjunction with DMRS port #0, #1, #4, or #5.
  • OCC sequence number #1 whose output results given by the pre-DFT OCC and the frequency domain comb structure after application of the DFT can be REs #1, #5, and #9, is mapped to the RE used for DMRS port #2, #3, #6, or #7, and can therefore be used in conjunction with DMRS port #2, #3, #6, or #7.
  • OCC sequence number #2 whose output results given by the pre-DFT OCC and the comb structure in the frequency domain after application of the DFT can be REs #2, #6, and #10, is mapped to the RE used for DMRS port #0, #1, #4, or #5, and can therefore be used in conjunction with DMRS port #0, #1, #4, or #5.
  • OCC sequence number #3 whose output results given by the pre-DFT OCC and the comb structure in the frequency domain after application of the DFT can be REs #3, #7, and #11, is mapped to the RE used for DMRS port #2, #3, #6, or #7, and can therefore be used in conjunction with DMRS port #2, #3, #6, or #7.
  • Figure 6 shows an example of applying pre-DFT OCC with an OCC sequence length of 6 (spreading factor 6).
  • the output result given by the frequency domain comb structure after applying the pre-DFT OCC and DFT will be RE numbers #0 and #6 within the RB (e.g., RE numbers #0 to #11) when OCC sequence number #0 is applied, RE numbers #1 and #7 within the RB when OCC sequence number #1 is applied, RE numbers #2 and #8 within the RB when OCC sequence number #2 is applied, RE numbers #3 and #9 within the RB when OCC sequence number #3 is applied, RE numbers #4 and #10 within the RB when OCC sequence number #4 is applied, and RE numbers #5 and #11 within the RB when OCC sequence number #5 is applied.
  • RE numbers #0 and #6 within the RB e.g., RE numbers #0 to #11
  • RE numbers #1 and #7 within the RB when OCC sequence number #1 is applied
  • RE numbers #2 and #8 within the RB when OCC sequence number #2 is applied RE numbers #3 and #9 within the RB when OCC sequence number #3 is applied
  • RE numbers #4 and #10 within the RB when
  • OCC sequence number #5 whose output results from the pre-DFT OCC and the comb structure in the frequency domain after application of the DFT can be REs #5 and #11, is mapped to the RE used for DMRS port #2, #3, #6, or #7, and can therefore be used in conjunction with DMRS port #2, #3, #6, or #7.
  • the output results (e.g., comb numbers, subcarriers or REs to which data signals are mapped) given by the comb structure in the frequency domain after applying the pre-DFT OCC and DFT are mapped to the subcarriers (or REs) used for DMRS. Therefore, the transmitting side (e.g., terminal 200) can transmit data signals (e.g., PUSCH) and DMRS using the same subcarriers or REs, thereby improving the accuracy of channel estimation on the receiving side (e.g., base station 100).
  • data signals e.g., PUSCH
  • DMRS mapped to the subcarriers (or REs) used for DMRS.
  • time domain signal y after applying pre-DFT OCC before applying DFT may be given by, for example, the following equation (1).
  • d(0), ..., d( Msymblayer - 1) are modulation symbol sequences.
  • MSCPUSH MRBPUSCH ⁇ NSCRB , where MRBPUSCH is the number of allocated RBs and NSCRB is the number of subcarriers (or REs) per RB.
  • Msymblayer is the number of modulation symbols per layer
  • NSF is the sequence length or spreading factor of the pre-DFT OCC.
  • wn (k) is the OCC sequence with pre-DFT OCC sequence number n.
  • the frequency domain signal z after applying the pre-DFT OCC and DFT may be given by, for example, the following equation (2).
  • cyclic shift sequences are generally known as OCC sequences that result in a comb structure in the frequency domain signal after applying pre-DFT OCC and DFT precoding.
  • pre-DFT OCC sequences Figure 8 shows an OCC sequence with an OCC sequence length of 2 (spreading factor 2)
  • Figure 9 shows an OCC sequence with an OCC sequence length of 4 (spreading factor 4)
  • Figure 10 shows an OCC sequence with an OCC sequence length of 6 (spreading factor 6).
  • the OCC sequence number used for the pre-DFT OCC may be controlled (e.g., determined or set) or limited depending on the subcarrier (or RE) or DMRS port used for the DMRS.
  • FIG. 11 is a flowchart showing an example of operation for determining an OCC sequence in terminal 200.
  • terminal 200 acquires at least one of information related to the DMRS configuration and information related to the DMRS port (S101).
  • the terminal 200 acquires information (e.g., sequence length or spreading factor) about the OCC sequence (pre-DFT OCC sequence) (S102).
  • information e.g., sequence length or spreading factor
  • terminal 200 determines an applicable or to-be-applied OCC sequence (S103). For example, as described above, terminal 200 may determine an OCC that has a relationship in which the subcarriers or REs given in the comb structure of the pre-DFT OCC and the frequency domain after DFT are mapped to the subcarriers or REs used for DMRS.
  • terminal 200 when using pre-DFT OCC, takes into consideration the relationship with the mapping position (e.g., comb structure) in the frequency domain of DMRS.
  • the frequency resources e.g., subcarriers or REs
  • the frequency resources e.g., subcarriers or REs
  • the frequency resources e.g., subcarriers or REs
  • the transmission quality of PUSCH using pre-DFT OCC can be improved.
  • the terminal 200 can properly transmit signals on the uplink.
  • the output results (e.g., comb numbers, subcarriers or REs to which data signals are mapped) given by the pre-DFT OCC and the frequency domain comb structure after applying the DFT may not match the subcarriers or REs to which DMRSs are mapped.
  • the output result given by the frequency domain comb structure after applying the pre-DFT OCC and DFT will be RE numbers #0, #3, #6, and #9 within the RB (e.g., RE numbers #0 to #11) when OCC sequence number #0 is applied, RE numbers #1, #4, #7, and #10 within the RB when OCC sequence number #1 is applied, and RE numbers #2, #5, #8, and #11 within the RB when OCC sequence number #2 is applied.
  • OCC sequence number #0 whose output results from the pre-DFT OCC and the frequency domain comb structure after DFT application can be REs #0, #3, #6, and #9, is mapped to, for example, some of the REs (REs #0 and REs #6) used for DMRS ports #0, #1, #4, or #5, and can therefore be used in conjunction with DMRS ports #0, #1, #4, or #5.
  • OCC sequence number #1 whose output results from the pre-DFT OCC and the frequency domain comb structure after DFT application can be REs #1, #4, #7, and #10, is mapped to, for example, some of the REs (REs #1 and REs #7) used for DMRS ports #2, #3, #6, or #7, and can therefore be used in conjunction with DMRS ports #2, #3, #6, or #7.
  • OCC sequence number #2 whose output results given by the comb structure in the frequency domain after applying the pre-DFT OCC and DFT can be RE2, #5, #8, and #11, is mapped to, for example, some of the REs (RE #2 and RE #8) used for DMRS port #0, #1, #4, or #5, and can therefore be used in conjunction with DMRS port #0, #1, #4, or #5.
  • subcarriers (REs) in the frequency domain comb structure after applying pre-DFT OCC and DFT are the same as the subcarriers (REs) to which DMRS is mapped, two out of four subcarriers are mapped to the same subcarriers (REs) as DMRS.
  • the output result (e.g., comb number, subcarrier or RE to which the data signal is mapped) given by the pre-DFT OCC and the frequency domain comb structure after applying the DFT may not match the RE mapping of the DMRS.
  • an OCC sequence may be used in which the subcarrier (RE) spacing in the pre-DFT OCC and the comb structure in the frequency domain after application of the DFT is an integer multiple of the subcarrier (RE) spacing in the DMRS mapping.
  • an OCC sequence in which the subcarrier (RE) spacing in the pre-DFT OCC and the comb structure in the frequency domain after application of the DFT is not an integer multiple of the subcarrier (RE) spacing in the DMRS mapping may not be used.
  • the subcarrier (RE) spacing in the DMRS RE mapping in DMRS Configuration Type 1 is 2.
  • a subcarrier (RE) spacing of 2 means that the DMRS sequence is mapped to RE numbers #0, #2, #4, #6, #8, and #10 within the RB, or RE numbers #1, #3, #5, #7, #9, and #11 within the RB, and has a comb structure in the frequency domain.
  • the subcarrier (RE) spacing in the frequency domain comb structure after applying the pre-DFT OCC and DFT is equivalent to the OCC sequence length (spreading factor). Therefore, for example, for DMRS configuration Type 1, a pre-DFT OCC with an OCC sequence length (spreading factor) that is an integer multiple of the subcarrier (RE) spacing of 2 (e.g., OCC sequence lengths of 2, 4, and 6) may be applied.
  • pre-DFT OCC with an OCC sequence length (spreading factor) of 8 may be applied in conjunction with the second embodiment described below.
  • DMRS configuration Type 1 is expected to support at least an OCC sequence length (spreading factor) of 8 in addition to OCC sequence lengths of 2, 4, and 6.
  • OCC sequence length spreading factor
  • the granularity of frequency domain resource allocation is 1 RB (e.g., 12 subcarriers)
  • NTN NTN
  • direct waves are dominant, resulting in a propagation environment with little frequency selectivity, and therefore little fluctuation in the frequency direction. For this reason, there is little loss of OCC orthogonality due to frequency-selective fading. It is also thought that there will be little loss of orthogonality even if OCC spreading is performed across multiple RBs.
  • the base station 100 and terminal 200 control the allocation unit (or granularity) of frequency resources (e.g., RBs) according to the length (or spreading factor) of the OCC sequence, and transmit or receive PUSCH using frequency resources allocated based on the allocation unit.
  • frequency resources e.g., RBs
  • frequency domain resource allocation is set in "N" RB units (N RB units) according to the OCC sequence length (spreading factor).
  • N is the smallest integer such that the OCC sequence length is a multiple of 2 and a divisor of (12 ⁇ N), for DMRS configuration Type 1, for example.
  • an OCC sequence may be applied that has the relationship that "the output results (e.g., comb numbers, subcarriers or REs to which data signals are mapped) given by the pre-DFT OCC and the comb structure in the frequency domain after applying the DFT are mapped to the subcarriers (or REs) used for DMRS.”
  • Figure 13 shows an example of applying pre-DFT OCC with an OCC sequence length of 8 (spreading factor of 8).
  • the output results given by the frequency domain comb structure after applying the pre-DFT OCC and DFT are RE numbers #0 and #8 in the even RBs (e.g., RE #0 to #11) and RE #4 in the odd RBs (e.g., RE #0 to #11) in units of 2 RBs when OCC sequence number #0 is applied, RE numbers #1 and #9 in the even RBs and #5 in the odd RBs in units of 2 RBs when OCC sequence number #1 is applied, and RE numbers #2, #10, and #11 in the even RBs in units of 2 RBs when OCC sequence number #2 is applied.
  • OCC sequence number #0 whose output result given by the comb structure in the frequency domain after applying the pre-DFT OCC and DFT can be RE numbers #0 and #8 in even RBs and RE #4 in odd RBs in 2-RB units, can be used in conjunction with DMRS ports #0, #1, #4, or #5.
  • OCC sequence number #1 whose output result given by the comb structure in the frequency domain after applying the pre-DFT OCC and DFT can be RE numbers #1 and #9 in even RBs and RE #5 in odd RBs in 2-RB units, can be used in conjunction with DMRS ports #1, #2, #6, or #7.
  • OCC sequence number #2 whose output result given by the comb structure in the frequency domain after applying pre-DFT OCC and DFT can be RE numbers #2 and #10 in even RBs and RE #6 in odd RBs in 2-RB increments, can be used in conjunction with DMRS ports #0, #1, #4, or #5.
  • OCC sequence number #3 whose output result given by the comb structure in the frequency domain after applying pre-DFT OCC and DFT can be RE numbers #3 and #11 in even RBs and RE #7 in odd RBs in 2-RB increments, can be used in conjunction with DMRS ports #2, #3, #6, or #7.
  • OCC sequence number #4 whose output result given by the comb structure in the frequency domain after applying pre-DFT OCC and DFT can be RE number #4 in even RBs and RE #0 and #8 in odd RBs in 2-RB increments, can be used in conjunction with DMRS ports #0, #1, #4, or #5.
  • OCC sequence number #5 whose output result given by the comb structure in the frequency domain after applying the pre-DFT OCC and DFT can be RE number #5 in even RBs and RE #1 and #9 in odd RBs in 2-RB increments, can be used in conjunction with DMRS port #2, #3, #6, or #7.
  • OCC sequence number #6, whose output result given by the comb structure in the frequency domain after applying the pre-DFT OCC and DFT can be RE number #6 in even RBs and RE #2 and #10 in odd RBs in 2-RB increments, can be used in conjunction with DMRS port #0, #1, #4, or #5.
  • OCC sequence number #7 whose output result given by the comb structure in the frequency domain after applying the pre-DFT OCC and DFT can be RE number #7 in even RBs and RE #3 and #11 in odd RBs in 2-RB increments, can be used in conjunction with DMRS port #2, #3, #6, or #7.
  • the pre-DFT OCC sequence with an OCC sequence length of 8 may be given by the sequence shown in Figure 14.
  • FIG. 15 is a flowchart showing an example of the operation of the terminal 200.
  • the terminal 200 acquires information (e.g., sequence length or spreading factor) about the OCC sequence (pre-DFT OCC sequence) (S201).
  • information e.g., sequence length or spreading factor
  • terminal 200 determines the frequency domain allocation resources (e.g., granularity such as the value of N) according to the OCC sequence length (S202). For example, for DMRS Configuration Type 1, terminal 200 determines the frequency domain allocation resources based on the value of N, which is the smallest integer such that the OCC sequence length is a multiple of 2 and a divisor of (12 ⁇ N).
  • the comb structure of the pre-DFT OCC and the frequency domain after DFT application can be matched with DMRS configuration Type 1 according to the OCC sequence length.
  • DMRS configuration Type 1 maximum number of multiplexed ports 8
  • an OCC sequence is applied that has the relationship that "the output results (e.g., comb numbers, subcarriers or REs to which data signals are mapped) given by the comb structure in the frequency domain after application of the pre-DFT OCC and DFT are mapped to the subcarriers (or REs) used for DMRS," but the present invention is not limited to this, and other methods for applying the pre-DFT OCC sequence (methods for applying an OCC sequence that do not have the above relationship) may also be used.
  • the DMRS port of a PUSCH (Dynamic Grant-PUSCH: DG-PUSCH) that is dynamically scheduled by DCI format 0-1 or DCI format 0-2 is determined based on information in the Antenna port field of the DCI.
  • the output results (e.g., comb numbers, subcarriers or REs to which data signals are mapped) provided by the frequency domain comb structure after applying pre-DFT OCC and DFT are associated with the subcarriers (or REs) used for DMRS, which is expected to improve the channel estimation accuracy of PUSCH to which pre-DFT OCC is applied.
  • base station 100 and terminal 200 when applying pre-DFT OCC to a PUSCH, base station 100 and terminal 200 determine the pre-DFT OCC sequence (e.g., OCC sequence number) based on the value of a field (e.g., Antenna port field) that notifies the DMRS port included in DCI, or the DMRS port notified by the Antenna port field, and transmit or receive a PUSCH to which the determined OCC sequence is applied.
  • a field e.g., Antenna port field
  • the DMRS port (or the value of the DCI bit field) is associated with the OCC sequence number as shown in FIG. 19. This allows the terminal 200 to determine the pre-DFT OCC sequence (OCC sequence number) based on the DMRS port (or the value of the Antenna port field) notified to the terminal 200 by the Antenna port field.
  • FIG. 20 is a flowchart showing an example of operation for determining an OCC sequence in terminal 200.
  • terminal 200 acquires information about the DMRS configuration and information about the DMRS port (S301).
  • the terminal 200 determines the DMRS port and OCC sequence associated with the value of the received DCI bit field (e.g., the Antenna port field) (S304).
  • the DMRS port and OCC sequence associated with the value of the received DCI bit field e.g., the Antenna port field
  • the OCC sequence using an existing DCI field (e.g., the Antenna port field), making it possible to dynamically notify the OCC sequence without increasing the number of DCI bits used to notify the OCC sequence. Therefore, even in scenarios where coverage improvement is expected, for example, it is possible to dynamically notify the OCC sequence while suppressing an increase in DCI overhead.
  • an existing DCI field e.g., the Antenna port field
  • terminal 200 may determine the pre-DFT PCC sequence (OCC sequence number) based on the value of a parameter (e.g., antennaPort) instructed by RRC.
  • a parameter e.g., antennaPort
  • the OCC method is not limited to OCC within an OFDM symbol using the pre-DFT OCC described above.
  • OCC methods to which this embodiment can be applied may be OCC applied between OFDM symbols, OCC applied between slots, or a combination of these.
  • Fig. 21 is a block diagram showing an example configuration of a base station 100.
  • the base station 100 includes a control unit 101, a higher-level control signal generation unit 102, a downlink control information generation unit 103, an encoding unit 104, a modulation unit 105, a signal allocation unit 106, a transmission unit 107, a reception unit 108, an extraction unit 109, a demodulation unit 110, and a decoding unit 111.
  • At least one of the transmitting unit 107 and the receiving unit 108 shown in FIG. 21 may be included in the communication unit shown in FIG. 2. Also, at least one of the control unit 101, higher-level control signal generating unit 102, downlink control information generating unit 103, encoding unit 104, modulation unit 105, signal allocation unit 106, receiving unit 108, extraction unit 109, demodulation unit 110, and decoding unit 111 shown in FIG. 21 may be included in the control unit shown in FIG. 1.
  • the control unit 101 determines information related to uplink transmission (e.g., PUSCH transmission) to the terminal 200, and outputs the determined information to at least one of the higher-level control signal generation unit 102 and the downlink control information generation unit 103.
  • the information related to PUSCH transmission may include, for example, information related to pre-DFT OCC (e.g., information related to the OCC sequence, such as the OCC sequence length or spreading factor), information related to DMRS, time domain resource allocation information (e.g., TDRA), and frequency domain resource allocation information (e.g., FDRA).
  • the control unit 101 also outputs the determined information to the extraction unit 109, demodulation unit 110, and decoding unit 111.
  • the control unit 101 also determines, for example, information relating to a higher-level control signal or a downlink signal for transmitting downlink control information (for example, a modulation and coding scheme (MCS) and radio resource allocation), and outputs the determined information to the coding unit 104, modulation unit 105, and signal allocation unit 106.
  • the control unit 101 also outputs, for example, information relating to a downlink signal (for example, a data signal or a higher-level control signal) to the downlink control information generation unit 103.
  • MCS modulation and coding scheme
  • the upper control signal generation unit 102 generates an upper layer control signal bit string based on, for example, information input from the control unit 101, and outputs the upper layer control signal bit string to the encoding unit 104.
  • the encoding unit 104 encodes the bit string input from the higher-level control signal generation unit 102 or the DCI bit string input from the downlink control information generation unit 103, for example, based on information input from the control unit 101.
  • the encoding unit 104 outputs the encoded bit string to the modulation unit 105.
  • the modulation unit 105 modulates the encoded bit sequence input from the encoding unit 104, for example, based on information input from the control unit 101, and outputs the modulated signal (e.g., a symbol sequence) to the signal allocation unit 106.
  • the modulated signal e.g., a symbol sequence
  • the signal allocation unit 106 maps the symbol sequence (including, for example, a downlink data signal or a control signal) input from the modulation unit 105 to the radio resource, for example, based on information indicating the radio resource input from the control unit 101.
  • the signal allocation unit 106 outputs the downlink signal onto which the signal has been mapped to the transmission unit 107.
  • the transmitting unit 107 performs, for example, orthogonal frequency division multiplexing (OFDM) transmission waveform generation processing on the signal input from the signal allocation unit 106. Furthermore, in the case of OFDM transmission that adds a cyclic prefix (CP), the transmitting unit 107 performs an inverse fast Fourier transform (IFFT) on the signal and adds the CP to the signal after the IFFT. Furthermore, the transmitting unit 107 performs RF processing on the signal, such as D/A conversion or up-conversion, and transmits the radio signal to the terminal 200 via an antenna.
  • OFDM orthogonal frequency division multiplexing
  • IFFT inverse fast Fourier transform
  • the receiving unit 108 performs RF processing such as downconvert or A/D conversion on the uplink signal received from the terminal 200 via an antenna. In the case of OFDM transmission, the receiving unit 108 also performs Fast Fourier Transform (FFT) processing on the received signal, and outputs the resulting frequency domain signal to the extraction unit 109.
  • FFT Fast Fourier Transform
  • the extraction unit 109 extracts the radio resource portion from which the uplink signal (e.g., PUSCH) was transmitted from the received signal input from the receiving unit 108, based on information input from the control unit 101, for example, and outputs the extracted radio resource portion to the demodulation unit 110.
  • the uplink signal e.g., PUSCH
  • the demodulation unit 110 demodulates the uplink signal (e.g., PUSCH) input from the extraction unit 109, for example, based on information input from the control unit 101.
  • the demodulation unit 110 outputs the demodulation result to the decoding unit 111, for example.
  • the decoding unit 111 performs error correction decoding of the uplink signal (e.g., PUSCH) based on, for example, information input from the control unit 101 and the demodulation results input from the demodulation unit 110, and obtains a decoded received bit sequence.
  • the uplink signal e.g., PUSCH
  • FIG. 22 is a block diagram showing an example configuration of a terminal 200 according to an embodiment of the present disclosure.
  • the terminal 200 includes a receiving unit 201, an extracting unit 202, a demodulating unit 203, a decoding unit 204, a control unit 205, an encoding unit 206, a modulating unit 207, a signal allocating unit 208, and a transmitting unit 209.
  • At least one of the receiving unit 201 and transmitting unit 209 shown in FIG. 22 may be included in the communication unit shown in FIG. 3. Also, at least one of the extracting unit 202, demodulating unit 203, decoding unit 204, control unit 205, encoding unit 206, modulating unit 207, signal allocation unit 208, and transmitting unit 209 shown in FIG. 22 may be included in the control unit shown in FIG. 3.
  • the receiver 201 receives, for example, a downlink signal (e.g., a downlink data signal or downlink control information) from the base station 100 via an antenna, and performs RF processing such as downconvert or A/D conversion on the radio received signal to obtain a received signal (baseband signal). Furthermore, when receiving an OFDM signal, the receiver 201 performs FFT processing on the received signal to convert it into the frequency domain. The receiver 201 outputs the received signal to the extractor 202.
  • a downlink signal e.g., a downlink data signal or downlink control information
  • RF processing such as downconvert or A/D conversion
  • baseband signal baseband signal
  • the receiver 201 performs FFT processing on the received signal to convert it into the frequency domain.
  • the receiver 201 outputs the received signal to the extractor 202.
  • the extraction unit 202 extracts a radio resource portion that may include downlink control information from the received signal input from the receiving unit 201, based on information about the radio resource of the downlink control information input from the control unit 205, and outputs the extracted radio resource portion to the demodulation unit 203.
  • the extraction unit 202 also extracts a radio resource portion that includes a downlink data signal, based on information about the radio resource of the data signal input from the control unit 205, and outputs the extracted radio resource portion to the demodulation unit 203.
  • the demodulation unit 203 demodulates the signal (e.g., PDCCH or PDSCH) input from the extraction unit 202, for example, based on information input from the control unit 205, and outputs the demodulation result to the decoding unit 204.
  • the signal e.g., PDCCH or PDSCH
  • the decoding unit 204 performs error correction decoding of the PDCCH or PDSCH, for example, using the demodulation result input from the demodulation unit 203, to obtain, for example, an upper layer control signal or downlink control information.
  • the decoding unit 204 outputs the upper layer control signal and downlink control information to the control unit 205.
  • the decoding unit 204 may also generate a response signal (for example, ACK/NACK) based on the PDSCH decoding result.
  • the control unit 205 performs uplink transmission control (including, for example, identifying information related to PUSCH repetition, such as the DMRS port or pre-DFT OCC sequence for PUSCH transmission) in accordance with the method described above, based on information related to PUSCH transmission obtained from a signal (for example, an upper layer control signal or downlink control information) input from the decoding unit 204.
  • the control unit 205 outputs the determined information to, for example, the encoding unit 206 and the signal allocation unit 208.
  • the encoding unit 206 encodes an uplink data signal (UL data signal) or an uplink control signal, for example, based on information input from the control unit 205.
  • the encoding unit 206 outputs the encoded bit string to the modulation unit 207.
  • the modulation unit 207 for example, modulates the encoded bit sequence input from the encoding unit 206 and outputs the modulated signal (symbol sequence) to the signal allocation unit 208.
  • the signal allocation unit 208 maps the signal (e.g., a sequence) input from the modulation unit 207 to radio resources, for example, based on information input from the control unit 205.
  • the signal allocation unit 208 outputs the uplink signal onto which the signal has been mapped to the transmission unit 209, for example.
  • the transmitter 209 generates a transmission signal waveform, such as OFDM, for the signal input from the signal allocation unit 208. Furthermore, in the case of OFDM transmission using CP, for example, the transmitter 209 performs IFFT processing on the signal and adds a CP to the signal after IFFT. Alternatively, when generating a single-carrier waveform, the transmitter 209 may have a DFT unit added after the modulator 207 or before the signal allocation unit 208 (not shown). Furthermore, the transmitter 209 performs RF processing, such as D/A conversion and up-conversion, on the transmission signal, and transmits the radio signal to the base station 100 via an antenna.
  • RF processing such as D/A conversion and up-conversion
  • the DCI formats are not limited to DCI format 0-1 and DCI format 0-2, and may be other formats.
  • DCI format 0-0 may also be called, for example, a fallback DCI format.
  • DCI format 0-1 may also be called, for example, a non-fallback DCI format.
  • the types, number of information fields, and size (number of bits) of information fields included in the DCI are merely examples, and DCI formats including other types, numbers, or sizes of information fields may also be used.
  • the channel used for uplink transmission (or the channel to which repetition is applied) is not limited to PUSCH, but may be other channels.
  • the type of information to be transmitted is not limited to data, but may be other types of information (for example, uplink control signal (PUCCH)).
  • PUCCH uplink control signal
  • one embodiment of the present disclosure is not limited to uplink transmission, but may also be applied to downlink transmission or sidelink transmission.
  • This disclosure may also be applied to communication between terminals, such as sidelink communication, for example.
  • one embodiment of the present disclosure can be applied regardless of the type of satellite, such as a Geostationary Earth Orbit satellite (GEO), a Medium Earth Orbit satellite (MEO), a Low Earth Orbit satellite (LEO), or a Highly Elliptical Orbit satellite (HEO).
  • GEO Geostationary Earth Orbit Satellite
  • MEO Medium Earth Orbit Satellite
  • LEO Low Earth Orbit Satellite
  • HEO Highly Elliptical Orbit Satellite
  • one embodiment of the present disclosure may also be applied to non-terrestrial communications, such as a HAPS or drone base station, for example.
  • NTN environment e.g., a satellite communication environment
  • present disclosure is not limited to this.
  • the present disclosure may also be applied to other communication environments (e.g., at least one terrestrial cellular environment of LTE and NR).
  • one embodiment of the present disclosure may be applied to terrestrial communications in an environment where the cell size is large and the propagation delay between the base station 100 and the terminal 200 is longer (e.g., above a threshold).
  • the form of satellite communication may be a configuration in which the base station functions are located on a satellite (for example, a "regenerative satellite"), or a configuration in which the base station functions are located on the ground and communications between the base station and the terminal are relayed by a satellite (for example, a "transparent satellite").
  • the downlink and uplink may be links between a terminal and a satellite, or links via a satellite.
  • the downlink control channel, downlink data channel, uplink control channel, and uplink data channel are not limited to PDCCH, PDSCH, PUCCH, and PUSCH, respectively, and may be control channels with other names.
  • RRC signaling is assumed as upper layer signaling, but this may also be replaced with Medium Access Control (MAC) signaling and DCI notification, which is physical layer signaling.
  • MAC Medium Access Control
  • the orthogonal sequence is not limited to an OCC sequence (for example, a sequence obtained by cyclically shifting an OCC sequence), and may be another sequence.
  • the reference signal associated with the orthogonal sequence is not limited to a DMRS, and may be another reference signal.
  • a case has been described in which the output result after applying the pre-DFT OCC and DFT, and the frequency resource used for the DMRS have a comb structure, but this is not limiting, and at least one may not have a comb structure.
  • the setting values of parameters such as the number of allocated RBs, the number of subcarriers (or number of REs) constituting one RB, the OCC sequence (e.g., sequence length, spreading factor, or sequence element), and the number of DMRS ports (e.g., maximum number) are not limited to the examples described above and may be other values.
  • the DMRS setting is not limited to DMRS Configuration Type 1 and may be other settings.
  • spreading using pre-DFT OCC may be applied in combination with other spreading methods (e.g., OCC applied between OFDM symbols or OCC applied between slots). For example, when multiplexing 4UEs, inter-slot OCC with an OCC sequence length of 2 may be combined with pre-DFT OCC with a sequence length of 2.
  • (supplement) Information indicating whether the terminal 200 supports the functions, operations, or processes described in each of the above-mentioned embodiments and each supplementary note may be transmitted (or notified) from the terminal 200 to the base station 100, for example, as capability information or capability parameters of the terminal 200.
  • the capability information may include information elements (IEs) that individually indicate whether the terminal 200 supports at least one of the functions, operations, or processes described in the above-described embodiments, modifications, and supplements.
  • the capability information may include information elements that indicate whether the terminal 200 supports a combination of any two or more of the functions, operations, or processes described in the above-described embodiments, modifications, and supplements.
  • the base station 100 may, for example, determine (or decide or assume) the functions, operations, or processes that the terminal 200 that transmitted the capability information supports (or does not support).
  • the base station 100 may perform operations, processes, or controls in accordance with the results of the determination based on the capability information.
  • the base station 100 may control uplink-related processing based on the capability information received from the terminal 200.
  • the terminal 200 does not support some of the functions, operations, or processes described in the above-mentioned embodiments, variations, and supplementary notes may be interpreted as meaning that such some of the functions, operations, or processes are restricted in the terminal 200. For example, information or requests regarding such restrictions may be notified to the base station 100.
  • Information regarding the capabilities or limitations of the terminal 200 may be defined in a standard, for example, or may be implicitly notified to the base station 100 in association with information already known at the base station 100 or information transmitted to the base station 100.
  • a downlink control signal (or downlink control information) related to an embodiment of the present disclosure may be, for example, a signal (or information) transmitted in a Physical Downlink Control Channel (PDCCH) of a physical layer, or a signal (or information) transmitted in a Medium Access Control Control Element (MAC CE) or Radio Resource Control (RRC) of a higher layer.
  • the signal (or information) is not limited to being notified by a downlink control signal, and may be predefined in a specification (or standard) or preconfigured in a base station and a terminal.
  • the uplink control signal (or uplink control information) related to one embodiment of the present disclosure may be, for example, a signal (or information) transmitted in a PUCCH in the physical layer, or a signal (or information) transmitted in a MAC CE or RRC in a higher layer.
  • the signal (or information) is not limited to being notified by an uplink control signal, but may be predefined in a specification (or standard), or may be preconfigured in the base station and the terminal.
  • the uplink control signal may be replaced with, for example, uplink control information (UCI), 1st stage sidelink control information (SCI), or 2nd stage SCI.
  • the base station may be a Transmission Reception Point (TRP), a cluster head, an access point, a Remote Radio Head (RRH), an eNodeB (eNB), a gNodeB (gNB), a Base Station (BS), a Base Transceiver Station (BTS), a parent device, a gateway, or the like.
  • TRP Transmission Reception Point
  • RRH Remote Radio Head
  • eNB eNodeB
  • gNB gNodeB
  • BS Base Station
  • BTS Base Transceiver Station
  • a terminal may play the role of a base station.
  • a relay device that relays communication between an upper node and a terminal may be used.
  • a roadside unit may be used.
  • An embodiment of the present disclosure may be applied to, for example, any of an uplink, a downlink, and a sidelink.
  • an embodiment of the present disclosure may be applied to a Physical Uplink Shared Channel (PUSCH), a Physical Uplink Control Channel (PUCCH), or a Physical Random Access Channel (PRACH) in the uplink, a Physical Downlink Shared Channel (PDSCH), a PDCCH, or a Physical Broadcast Channel (PBCH) in the downlink, or a Physical Sidelink Shared Channel (PSSCH), a Physical Sidelink Control Channel (PSCCH), or a Physical Sidelink Broadcast Channel (PSBCH) in the sidelink.
  • PUSCH Physical Uplink Shared Channel
  • PUCCH Physical Uplink Control Channel
  • PRACH Physical Random Access Channel
  • PDSCH Physical Downlink Shared Channel
  • PBCH Physical Broadcast Channel
  • PSSCH Physical Sidelink Shared Channel
  • PSCCH Physical Sidelink Control Channel
  • PSBCH Physical Sidelink Broadcast Channel
  • PDCCH, PDSCH, PUSCH, and PUCCH are examples of a downlink control channel, a downlink data channel, an uplink data channel, and an uplink control channel, respectively.
  • PSCCH and PSSCH are examples of a sidelink control channel and a sidelink data channel.
  • PBCH and PSBCH are examples of a broadcast channel, and PRACH is an example of a random access channel.
  • An embodiment of the present disclosure may be applied to, for example, either a data channel or a control channel.
  • the channel in an embodiment of the present disclosure may be replaced with any of the data channels PDSCH, PUSCH, and PSSCH, or the control channels PDCCH, PUCCH, PBCH, PSCCH, and PSBCH.
  • the reference signal is a signal known by both the base station and the mobile station, and may be referred to as a Reference Signal (RS) or a pilot signal.
  • the reference signal may be any of a Demodulation Reference Signal (DMRS), a Channel State Information - Reference Signal (CSI-RS), a Tracking Reference Signal (TRS), a Phase Tracking Reference Signal (PTRS), a Cell-specific Reference Signal (CRS), or a Sounding Reference Signal (SRS).
  • DMRS Demodulation Reference Signal
  • CSI-RS Channel State Information - Reference Signal
  • TRS Tracking Reference Signal
  • PTRS Phase Tracking Reference Signal
  • CRS Cell-specific Reference Signal
  • SRS Sounding Reference Signal
  • the unit of time resource is not limited to one or a combination of slots and symbols, but may be, for example, a time resource unit such as a frame, a superframe, a subframe, a slot, a time slot, a subslot, a minislot, a symbol, an Orthogonal Frequency Division Multiplexing (OFDM) symbol, a Single Carrier-Frequency Division Multiplexing Access (SC-FDMA) symbol, or another time resource unit.
  • OFDM Orthogonal Frequency Division Multiplexing
  • SC-FDMA Single Carrier-Frequency Division Multiplexing Access
  • the number of symbols included in one slot is not limited to the number of symbols exemplified in the above embodiment, and may be another number of symbols.
  • An embodiment of the present disclosure may be applied to either a licensed band or an unlicensed band.
  • An embodiment of the present disclosure may be applied to any of communication between a base station and a terminal (Uu link communication), communication between terminals (Sidelink communication), and Vehicle to Everything (V2X) communication.
  • the channel in an embodiment of the present disclosure may be replaced with any of PSCCH, PSSCH, Physical Sidelink Feedback Channel (PSFCH), PSBCH, PDCCH, PUCCH, PDSCH, PUSCH, and PBCH.
  • an embodiment of the present disclosure may be applied to either a terrestrial network or a non-terrestrial network (NTN: Non-Terrestrial Network) using a satellite or a High Altitude Pseudo Satellite (HAPS).
  • NTN Non-Terrestrial Network
  • HAPS High Altitude Pseudo Satellite
  • an embodiment of the present disclosure may be applied to a terrestrial network in which the transmission delay is large compared to the symbol length or slot length, such as a network with a large cell size or an ultra-wideband transmission network.
  • the operation for uplink, downlink, and sidelink symbols may be applied to symbols (e.g., SBFD symbols) on which SBFD (Subband Non-Overlapping Full Duplex, Subband Full Duplex) operation or control is performed.
  • SBFD Subband Non-Overlapping Full Duplex, Subband Full Duplex
  • a frequency domain or frequency resource, frequency band
  • a terminal transmits and receives in different directions (e.g., downlink or uplink) in units of subbands, which are the divided domains.
  • a terminal may transmit and receive in one direction, either the uplink or the downlink, but not in the other direction.
  • a base station may be capable of transmitting and receiving on both the uplink and the downlink simultaneously.
  • the SBFD symbol may have a smaller frequency domain available for the downlink than a symbol that transmits and receives only on the downlink.
  • the SBFD symbol may have a smaller frequency domain available for the uplink than a symbol that transmits and receives only on the uplink.
  • a terminal may transmit and receive uplink and downlink simultaneously.
  • the frequency domain in which the terminal transmits and the frequency domain in which it receives may not be adjacent, but may be separated by a frequency interval (also called a frequency gap).
  • sidelink transmission and reception may be included as different transmission and reception directions in subband units, which are divided areas.
  • the operations for uplink, downlink, and sidelink symbols may be applied to symbols (e.g., full duplex symbols) for which full duplex operation or control is performed.
  • symbols e.g., full duplex symbols
  • both the terminal and the base station can simultaneously transmit and receive on the uplink and downlink.
  • the terminal and the base station may simultaneously transmit and receive in the available frequency domain (or frequency resource, frequency band), or may simultaneously transmit and receive in a portion of the frequency domain (i.e., transmission or reception may be performed in the remaining frequency domain).
  • the frequency domain in which the base station or terminal transmits and receives may not be adjacent, but may have a frequency interval (also called a frequency gap).
  • either the terminal or the base station may simultaneously transmit and receive (i.e., the other may transmit or receive).
  • full duplex operation may be applied to an operation in which a terminal is capable of simultaneously transmitting and receiving sidelink signals.
  • full duplex operation may be applied to an operation in which a terminal is capable of simultaneously transmitting and receiving sidelink signals and uplink or downlink signals.
  • an antenna port refers to a logical antenna (antenna group) consisting of one or more physical antennas.
  • an antenna port does not necessarily refer to a single physical antenna, but may refer to an array antenna consisting of multiple antennas.
  • the number of physical antennas that an antenna port is composed of is not specified, and the antenna port may be specified as the smallest unit by which a terminal station can transmit a reference signal.
  • an antenna port may also be specified as the smallest unit for multiplying a weighting of a precoding vector.
  • the 5G NR system architecture generally assumes a Next Generation - Radio Access Network (NG-RAN) comprising gNBs.
  • the gNBs provide UE-side termination of the NG radio access user plane (SDAP/PDCP/RLC/MAC/PHY) and control plane (RRC) protocols.
  • SDAP/PDCP/RLC/MAC/PHY NG radio access user plane
  • RRC control plane
  • the gNBs are connected to each other via an Xn interface.
  • the gNBs are also connected to a Next Generation Core (NGC) via a Next Generation (NG) interface, more specifically to an Access and Mobility Management Function (AMF) (e.g., a specific core entity that performs AMF) via an NG-C interface, and to a User Plane Function (UPF) (e.g., a specific core entity that performs UPF) via an NG-U interface.
  • NNC Next Generation Core
  • AMF Access and Mobility Management Function
  • UPF User Plane Function
  • the NG-RAN architecture is shown in Figure 23 (see, for example, 3GPP TS 38.300 v15.6.0, section 4).
  • ⁇ RRC connection setup and reconfiguration procedure> This shows the NAS part of the interaction between the UE, gNB, and AMF (5GC entity) when the UE transitions from RRC_IDLE to RRC_CONNECTED (see TS 38.300 v15.6.0).
  • RRC is a higher layer signaling (protocol) used to configure the UE and gNB.
  • the AMF prepares UE context data (including, for example, PDU session context, security keys, UE Radio Capability, UE Security Capabilities, etc.) and sends it to the gNB with an INITIAL CONTEXT SETUP REQUEST.
  • the gNB then activates AS security together with the UE. This is done by the gNB sending a SecurityModeCommand message to the UE, and the UE responding with a SecurityModeComplete message to the gNB.
  • the gNB then sends an RRCReconfiguration message to the UE, and upon receiving an RRCReconfigurationComplete from the UE, the gNB performs reconfiguration to set up Signaling Radio Bearer 2 (SRB2) and Data Radio Bearer (DRB). For signaling-only connections, the RRCReconfiguration step is omitted since SRB2 and DRB are not set up. Finally, the gNB notifies the AMF that the setup procedure is complete with an INITIAL CONTEXT SETUP REPONSE.
  • SRB2 Signaling Radio Bearer 2
  • DRB Data Radio Bearer
  • a 5th Generation Core (5GC) entity e.g., AMF, SMF, etc.
  • a control circuit that, during operation, establishes a Next Generation (NG) connection with a gNodeB
  • a transmitter that, during operation, transmits an initial context setup message to the gNodeB via the NG connection so that a signaling radio bearer between the gNodeB and a user equipment (UE) is set up.
  • the gNodeB transmits Radio Resource Control (RRC) signaling including a resource allocation configuration information element (IE) to the UE via the signaling radio bearer.
  • RRC Radio Resource Control
  • IE resource allocation configuration information element
  • QoS Quality of Service
  • GRR Guaranteed Bit Rate QoS flows
  • non-GBR QoS flows QoS flows that do not require a guaranteed flow bit rate
  • QFI QoS Flow ID
  • 5GC For each UE, 5GC establishes one or more PDU sessions. For each UE, the NG-RAN establishes, for example, at least one Data Radio Bearer (DRB) to match the PDU session. Additional DRBs for the QoS flows of that PDU session can be configured later (when this is up to the NG-RAN).
  • the NG-RAN maps packets belonging to different PDU sessions to different DRBs.
  • NAS-level packet filters in the UE and 5GC associate UL packets and DL packets with QoS flows, while AS-level mapping rules in the UE and NG-RAN associate UL QoS flows and DL QoS flows with DRBs.
  • the base station described in each embodiment may be configured with three functional modules: a Centralized Unit (CU), a Distributed Unit (DU), and a Radio Unit (RU).
  • CU Centralized Unit
  • DU Distributed Unit
  • RU Radio Unit
  • a CU may be referred to, for example, as a centralized node, aggregation node, central station, aggregation station, or centralized unit.
  • a DU may be referred to, for example, as an O-DU (O-RAN Distributed Unit), distributed node, distributed station, or distributed unit.
  • An RU may be referred to, for example, as an O-RU (O-RAN Radio Unit), radio device, radio node, radio station, antenna unit, or radio unit.
  • vision options include the following division options 1 to 8.
  • the functions of the base station described in each embodiment may be divided into a CU, a DU, and an RU by any of the following division options 1 to 8.
  • the CU, DU, and RU may be functionally divided, or the functions may be divided only between the CU and DU or only between the DU and RU.
  • Segmentation option 1 Between RRC (radio resource control) and PDCP (2) Segmentation option 2: Between PDCP and RLC (High-RLC) (3) Segmentation option 3: Between High-RLC and Low-RLC (4) Segmentation option 4: Between RLC (Low-RLC) and MAC (High-MAC) (5) Segmentation option 5: Between High-MAC and Low-MAC (6) Segmentation option 6: Between MAC (Low-MAC) and PHY (High-PHY) (7) Segmentation option 7: Between High-PHY and Low-PHY (8) Segmentation option 8: Between PHY (Low-PHY) and RF
  • the functional split point between the CU and O-DU may be Split Option 2.
  • the area between the CU and O-DU is called midhaul, and the F1 interface is specified by 3GPP.
  • the area between the O-DU and O-RU is called fronthaul, and the functional split point may be Split Option 7-2x, which has been adopted as the O-RAN fronthaul specification.
  • Figure 24 shows an example of functional division of the gNB base station functions into CU, O-DU, and O-RU using Split Option 2 and Split Option 7-2x.
  • the CU may have, for example, RRC (radio resource control) functionality, SDAP (service data adaptation protocol) functionality, and PDCP (packet data convergence protocol) functionality.
  • RRC radio resource control
  • SDAP service data adaptation protocol
  • PDCP packet data convergence protocol
  • the O-DU may include, for example, an RLC (radio link control) function, a MAC function, and a higher physical layer (HIGH-PHY) function.
  • the HIGH-PHY function may also include an encoding function, a scrambling function, a modulation function, a layer mapping function, a precoding function, and a RE (resource element) mapping function for downlink (DL) transmission.
  • the HIGH-PHY function may also include a decoding function, a descrambling function, a demodulation function, a layer demapping function, and a RE (resource element) demapping function for uplink (UL) reception.
  • the O-RU may have, for example, a LOW-PHY function and an RF function.
  • the LOW-PHY function may have a beamforming function, an IFFT (Inverse First Fourier Transform) + CP (Cyclic Prefix) assignment function, and a D/A (Digital to Analog) conversion function for downlink transmission.
  • the LOW-PHY function may have an A/D (Analog to Digital) conversion function, a CP removal + FFT (First Fourier Transform) function, and a beamforming function for uplink reception.
  • the O-RU may have a precoding function.
  • the O-RU may also be equipped with LBT (listen before talk) functionality.
  • LBT listen before talk
  • eCPRI Evolved Common Public Radio Interface
  • eCPRI is specified as the communication method between the O-DU and O-RU in Split Option 7-2x.
  • eCPRI is used to transmit and receive sampling sequences of the in-phase (I) and quadrature (Q) components of OFDM signals in the frequency domain, as well as information used for beamforming in the antenna and time synchronization signals.
  • Information transmitted by the signals described in each embodiment may be transmitted between the O-DU and O-RU via the eCPRI User Plane (U-Plane) or Control Plane (C-Plane).
  • U-Plane eCPRI User Plane
  • C-Plane Control Plane
  • the O-DU may control the O-RU by transmitting information for controlling the functions via a control signal (e.g., eCPRI) between the O-DU and the O-RU.
  • a control signal e.g., eCPRI
  • the O-RU may receive the results of the functions performed in the O-DU via a control signal (e.g., eCPRI) and control the O-RU based on the received results.
  • a control signal e.g., eCPRI
  • the CU, O-DU, and O-RU may be deployed in physically different devices with their respective functions connected by optical fiber or the like, or some or all of their functions may be deployed in the same physical device.
  • the CU and O-DU may be logical entities implemented as software running on a server in the cloud or elsewhere, as a virtualized RAN (virtual Radio Access Network: vRAN). Some or all of the functions of the CU and O-DU may also be provided as a virtualized network functions (Network Functions Virtualization: NFV) service.
  • NFV Network Functions Virtualization
  • the transceiver does not have to be a radio transceiver, but may be, for example, a network transceiver, an optical transceiver, etc.
  • the radio resources allocated by the O-DU may be resources for wireless communication between the O-RU and the UE.
  • This disclosure can be realized as software, hardware, or software in conjunction with hardware.
  • Each functional block used in the description of the above embodiments may be realized, in part or in whole, as an LSI, which is an integrated circuit, and each process described in the above embodiments may be controlled, in part or in whole, by a single LSI or a combination of LSIs.
  • the LSI may be composed of individual chips, or may be composed of a single chip that contains some or all of the functional blocks.
  • the LSI may have data input and output. Depending on the level of integration, the LSI may also be called an IC, system LSI, super LSI, or ultra LSI.
  • the integrated circuit method is not limited to LSI, and may be realized using dedicated circuits, general-purpose processors, or dedicated processors. It is also possible to use FPGAs (Field Programmable Gate Arrays), which can be programmed after LSI manufacturing, or reconfigurable processors, which allow the connections and settings of circuit cells within LSIs to be reconfigured.
  • FPGAs Field Programmable Gate Arrays
  • reconfigurable processors which allow the connections and settings of circuit cells within LSIs to be reconfigured.
  • the present disclosure may be realized as digital processing or analog processing.
  • a communications apparatus may include a radio transceiver and processing/control circuitry.
  • the radio transceiver may include a receiver and a transmitter, or each of these functions.
  • the radio transceiver (transmitter and receiver) may include an RF (Radio Frequency) module and one or more antennas.
  • the RF module may include an amplifier, an RF modulator/demodulator, or the like.
  • Non-limiting examples of communication devices include telephones (e.g., cell phones, smartphones), tablets, personal computers (PCs) (e.g., laptops, desktops, notebooks), cameras (e.g., digital still/video cameras), digital players (e.g., digital audio/video players), wearable devices (e.g., wearable cameras, smartwatches, tracking devices), game consoles, digital book readers, telehealth/telemedicine devices, communication-enabled vehicles or mobile transportation (e.g., cars, airplanes, ships), and combinations of the above devices.
  • telephones e.g., cell phones, smartphones
  • tablets personal computers (PCs) (e.g., laptops, desktops, notebooks)
  • cameras e.g., digital still/video cameras
  • digital players e.g., digital audio/video players
  • wearable devices e.g., wearable cameras, smartwatches, tracking devices
  • game consoles digital book readers
  • telehealth/telemedicine devices communication-enabled vehicles or mobile transportation (e
  • Communication devices are not limited to portable or mobile devices, but also include all types of non-portable or fixed equipment, devices, and systems, such as smart home devices (home appliances, lighting equipment, smart meters or measuring devices, control panels, etc.), vending machines, and any other "things” that may exist on an IoT (Internet of Things) network.
  • smart home devices home appliances, lighting equipment, smart meters or measuring devices, control panels, etc.
  • vending machines and any other "things” that may exist on an IoT (Internet of Things) network.
  • IoT Internet of Things
  • Communications include data communications via cellular systems, wireless LAN systems, communications satellite systems, etc., as well as data communications via combinations of these.
  • the term "communications apparatus” also includes devices such as controllers and sensors that are connected or coupled to a communications device that performs the communications functions described in this disclosure. For example, it includes controllers and sensors that generate control signals and data signals used by a communications device that performs the communications functions of the communications apparatus.
  • communication equipment includes infrastructure facilities, such as base stations, access points, and any other equipment, devices, or systems that communicate with or control the various devices listed above, but are not limited to these.
  • a terminal comprises: a control circuit that determines an orthogonal sequence such that at least a portion of the frequency domain output result obtained by applying an orthogonal sequence to a signal before a Discrete Fourier Transform (DFT) and applying the DFT to the signal is mapped to a frequency resource used for a demodulation reference signal; and a transmission circuit that transmits the signal to which the orthogonal sequence has been applied.
  • a control circuit that determines an orthogonal sequence such that at least a portion of the frequency domain output result obtained by applying an orthogonal sequence to a signal before a Discrete Fourier Transform (DFT) and applying the DFT to the signal is mapped to a frequency resource used for a demodulation reference signal
  • DFT Discrete Fourier Transform
  • the orthogonal sequence is a sequence obtained by cyclically shifting an Orthogonal Cover Code (OCC) sequence.
  • OCC Orthogonal Cover Code
  • DMRS configuration Type 1 is applied to the setting of the demodulation reference signal.
  • control circuit determines the orthogonal sequence having the relationship in which the spacing of the frequency resources in the comb structure of the output result is an integer multiple of the spacing of the frequency resources used for the DMRS.
  • a terminal includes a control circuit that, when applying an orthogonal sequence to a signal before a Discrete Fourier Transform (DFT), controls the allocation unit of frequency resources according to the length of the orthogonal sequence, and a transmission circuit that transmits the signal using the frequency resources allocated based on the allocation unit.
  • DFT Discrete Fourier Transform
  • the allocation unit is a unit of N resource blocks, where N is the smallest integer such that the length of the orthogonal sequence is a multiple of 2 and a divisor of (12 ⁇ N).
  • a terminal includes a control circuit that, when applying an orthogonal sequence to a signal before a Discrete Fourier Transform (DFT), determines the orthogonal sequence based on the value of a field that notifies the port of a demodulation reference signal included in downlink control information, and a transmission circuit that transmits the signal to which the orthogonal sequence has been applied.
  • DFT Discrete Fourier Transform
  • a base station comprises: a control circuit that determines an orthogonal sequence such that at least a portion of the frequency domain output result obtained by applying an orthogonal sequence to a signal before a Discrete Fourier Transform (DFT) and applying the DFT to the signal is mapped to a frequency resource used for a demodulation reference signal; and a receiving circuit that receives the signal to which the orthogonal sequence has been applied.
  • a control circuit that determines an orthogonal sequence such that at least a portion of the frequency domain output result obtained by applying an orthogonal sequence to a signal before a Discrete Fourier Transform (DFT) and applying the DFT to the signal is mapped to a frequency resource used for a demodulation reference signal
  • DFT Discrete Fourier Transform
  • a terminal determines an orthogonal sequence such that at least a portion of the frequency domain output result obtained by applying an orthogonal sequence to a signal before a Discrete Fourier Transform (DFT) and applying the DFT to the signal is mapped to a frequency resource used for a demodulation reference signal, and transmits the signal to which the orthogonal sequence has been applied.
  • DFT Discrete Fourier Transform
  • a base station determines an orthogonal sequence such that at least a portion of the frequency domain output results obtained by applying an orthogonal sequence to a signal before a Discrete Fourier Transform (DFT) and applying the DFT to the signal are mapped to frequency resources used for a demodulation reference signal, and receives the signal to which the orthogonal sequence has been applied.
  • DFT Discrete Fourier Transform
  • One embodiment of the present disclosure is useful in wireless communication systems.
  • Base station 101 Base station 101, 205 Control unit 102 Upper control signal generation unit 103 Downlink control information generation unit 104, 206 Encoding unit 105, 207 Modulation unit 106, 208 Signal allocation unit 107, 209 Transmission unit 108, 201 Reception unit 109, 202 Extraction unit 110, 203 Demodulation unit 111, 204 Decoding unit 200 Terminal

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

Abstract

Le présent terminal comprend : un circuit de commande qui détermine une séquence orthogonale ayant une relation dans laquelle, dans un domaine fréquentiel, au moins une partie d'un résultat de sortie obtenu par application de la séquence orthogonale à un signal avant une transformée de Fourier discrète (DFT) et appliquant une DFT au signal est mappée à une ressource de fréquence utilisée dans un signal de référence de démodulation ; et un circuit de transmission qui transmet le signal auquel la séquence orthogonale est appliquée.
PCT/JP2024/041834 2024-02-16 2024-11-26 Terminal, station de base et procédé de communication Pending WO2025173344A1 (fr)

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JP2024-022167 2024-02-16

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019138514A1 (fr) * 2018-01-11 2019-07-18 株式会社Ｎｔｔドコモ Dispositif d'utilisateur, et procédé de communication radio
WO2022192030A1 (fr) * 2021-03-12 2022-09-15 Intel Corporation Schémas de transmission et/ou de retransmission pour des données dans des systèmes à fréquences porteuses élevées
WO2023037448A1 (fr) * 2021-09-08 2023-03-16 株式会社Ｎｔｔドコモ Terminal, procédé de communication sans fil et station de base

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019138514A1 (fr) * 2018-01-11 2019-07-18 株式会社Ｎｔｔドコモ Dispositif d'utilisateur, et procédé de communication radio
WO2022192030A1 (fr) * 2021-03-12 2022-09-15 Intel Corporation Schémas de transmission et/ou de retransmission pour des données dans des systèmes à fréquences porteuses élevées
WO2023037448A1 (fr) * 2021-09-08 2023-03-16 株式会社Ｎｔｔドコモ Terminal, procédé de communication sans fil et station de base

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ERICSSON: "Feature lead summary for UL Signals and Channels", 3GPP DRAFT; R1-1911484 FEATURE LEAD SUMMARY FOR 7.2.2.1.3 UL SIGNALS AND CHANNELS, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), vol. RAN WG1, 22 October 2019 (2019-10-22), FR, XP051798749 *

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