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WO2024132538A1 - Réduction de papr par réservation de tonalité - Google Patents

Réduction de papr par réservation de tonalité Download PDF

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Publication number
WO2024132538A1
WO2024132538A1 PCT/EP2023/084597 EP2023084597W WO2024132538A1 WO 2024132538 A1 WO2024132538 A1 WO 2024132538A1 EP 2023084597 W EP2023084597 W EP 2023084597W WO 2024132538 A1 WO2024132538 A1 WO 2024132538A1
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WIPO (PCT)
Prior art keywords
subcarriers
wireless telecommunications
telecommunications apparatus
reserved
tone reservation
Prior art date
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PCT/EP2023/084597
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English (en)
Inventor
Samuel Asangbeng Atungsiri
Martin Warwick Beale
Shin Horng Wong
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Sony Europe BV United Kingdom Branch
Sony Group Corp
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Sony Europe BV United Kingdom Branch
Sony Group Corp
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Publication of WO2024132538A1 publication Critical patent/WO2024132538A1/fr
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    • 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
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2614—Peak power aspects
    • H04L27/2618—Reduction thereof using auxiliary subcarriers
    • 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
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H04L27/2613—Structure of the reference signals
    • H04L27/26136—Pilot sequence conveying additional information

Definitions

  • the present disclosure relates to wireless telecommunications apparatuses and methods.
  • Recent generation mobile telecommunication systems such as those based on the 3 rd Generation Partnership Project (3GPP (RTM)) defined Universal Mobile Telecommunications System (UMTS), Long Term Evolution (LTE) and 5G New Radio (NR) architectures, are able to support a wider range of services than simple voice and messaging services offered by previous generations of mobile telecommunication systems.
  • 3GPP 3 rd Generation Partnership Project
  • UMTS Universal Mobile Telecommunications System
  • LTE Long Term Evolution
  • NR 5G New Radio
  • newer generation mobile telecommunication systems such as NR to support less complex services and devices which make use of the reliable and wide ranging coverage of newer generation mobile telecommunication systems without necessarily needing to rely on the high data rates available in such systems.
  • a less complex device may be a tiny device equipped with sensors and a small battery capacity. Such a less complex device needs to transmit the sensor data at a typically infrequent and/or low data rate.
  • Fig. 1 schematically represents some elements of an LTE-type wireless telecommunications system
  • Fig. 2 schematically represents some elements of an NR-type wireless telecommunications system
  • FIG. 3 schematically represents some components of the wireless telecommunications system shown in Fig. 2 in more detail;
  • Fig. 4 schematically shows some signal processing steps implemented by a wireless telecommunications apparatus
  • Fig. 5 shows a first example method of controlling a wireless telecommunications apparatus
  • Fig. 6 shows a second example method of controlling a wireless telecommunications apparatus.
  • LTE Long Term Evolution
  • Fig. 1 provides a schematic diagram illustrating some basic functionality of a mobile telecommunications network I system 6 operating generally in accordance with LTE principles, but which may also support other radio access technologies, and which may be adapted to implement embodiments of the disclosure as described herein.
  • Various elements of Fig. 1 and certain aspects of their respective modes of operation are well-known and defined in the relevant standards administered by the 3GPP body, and also described in many books on the subject, for example, Holma, H.
  • the network 6 includes a plurality of base stations 1 connected to a core network 2. Each base station provides a coverage area 3 (i.e. a cell) within which data can be communicated to and from communications devices 4.
  • a coverage area 3 i.e. a cell
  • each base station 1 is shown in Fig. 1 as a single entity, the skilled person will appreciate that some of the functions of the base station may be carried out by disparate, interconnected elements, such as antennas (or antennae), remote radio heads, amplifiers, etc.
  • one or more base stations may form a radio access network. Data is transmitted from base stations 1 to communications devices 4 within their respective coverage areas 3 via a radio downlink (DL). Data is transmitted from communications devices 4 to the base stations 1 via a radio uplink (UL).
  • the core network 2 routes data to and from the communications devices 4 via the respective base stations 1 and provides functions such as authentication, mobility management, charging and so on.
  • a communications device may also be referred to as a mobile station, user equipment (UE), user terminal, mobile radio, terminal device and so forth.
  • Services provided by the core network 2 may include connectivity to the internet or to external telephony services.
  • the core network 2 may further track the location of the communications devices 4 so that it can efficiently contact (i.e. page) the communications devices 4 for transmitting downlink data towards the communications devices 4.
  • a base station which is an example of network infrastructure equipment, may also be referred to as a transceiver station, nodeB, e-nodeB, eNB, g-nodeB, gNB and so forth (note g-nodeB and gNB are related to 5G New Radio - see below).
  • nodeB nodeB
  • e-nodeB nodeB
  • eNB nodeB
  • g-nodeB and gNB are related to 5G New Radio - see below.
  • 5G New Radio - 5G New Radio
  • any apparatus e.g. communications device, infrastructure equipment and the like which transmits and/or receives wireless telecommunications signals in any of the exemplified wireless telecommunication networks I systems may be referred to generally as a wireless telecommunications apparatus.
  • FIG. 2 An example configuration of a wireless communications network which uses some of the terminology proposed for NR is shown in Fig. 2.
  • a plurality of transmission and reception points (TRPs) 10 are connected to distributed control units (DUs) 41 , 42 by a connection interface represented as a line 16.
  • Each of the TRPs 10 is arranged to transmit and receive signals via a wireless access interface within a radio frequency bandwidth available to the wireless communications network.
  • each of the TRPs 10 forms a cell of the wireless communications network as represented by a circle 12.
  • wireless communications devices 14 which are within a radio communications range provided by the cells 12 can transmit and receive signals to and from the TRPs 10 via the wireless access interface.
  • Each of the distributed units 41 , 42 are connected to a central unit (CU) 40 (which may be referred to as a controlling node) via an interface 46.
  • the central unit 40 is then connected to a core network 20 which may contain all other functions required for communicating data to and from the wireless communications devices and the core network 20.
  • the core network 20 may be connected to other networks 300.
  • the elements of the wireless access network shown in Fig. 2 may operate in a similar way to corresponding elements of an LTE network as described with regard to the example of Fig. 1 . It will be appreciated that operational aspects of the telecommunications network represented in Fig. 2 and of other networks discussed herein in accordance with embodiments of the disclosure which are not specifically described (for example in relation to specific communication protocols and physical channels for communicating between different elements) may be implemented in accordance with any known techniques, for example according to currently used approaches for implementing such operational aspects of wireless telecommunications systems, e.g. in accordance with the relevant standards.
  • the TRPs 10 of Fig. 2 may in part have a corresponding functionality to a base station or eNodeB of an LTE network.
  • the communications devices 14 may have a functionality corresponding to the UE devices 4 known for operation with an LTE network.
  • operational aspects of an NR network may be different to those known from LTE or other known mobile telecommunications standards.
  • each of the core network component, base stations and communications devices of an NR network will be functionally similar to, respectively, the core network component, base stations and communications devices of an LTE wireless communications network.
  • the core network 20 connected to the NR telecommunications system represented in Fig. 2 may be broadly considered to correspond with the core network 2 represented in Fig. 1
  • the central unit 40 and associated DUs 41 , 42 / TRPs 10 may be broadly considered to provide functionality corresponding to the base stations 1 of Fig. 1
  • the term network infrastructure equipment I access node may be used to encompass these elements and more conventional base station type elements of wireless telecommunications systems.
  • the responsibility for scheduling transmissions which are scheduled on the radio interface between the respective distributed units and the communications devices may lie with the CU 40, DUs 41 , 42 and/or TRPs 10.
  • Communications devices 14 are represented in Fig. 2 within the coverage area of respective communication cells 12. These communications devices 14 may thus exchange signalling with the CU 40 via the TRP 10 associated with their respective communication cells 12.
  • Fig. 2 represents merely one example of a proposed architecture for an NR-based telecommunications system in which approaches in accordance with the principles described herein may be adopted, and the functionality disclosed herein may also be applied in respect of wireless telecommunications systems having different architectures.
  • certain embodiments of the disclosure as discussed herein may be implemented in wireless telecommunication systems I networks according to various different architectures, such as the example architectures shown in Figs. 1 and 2. It will thus be appreciated the specific wireless telecommunications architecture in any given implementation is not of primary significance to the principles described herein.
  • the network infrastructure equipment / access node may comprise a base station, such as an LTE-type base station 1 as shown in Fig. 1 which is adapted to provide functionality in accordance with the principles described herein, and in other examples the network infrastructure equipment may comprise a CU 40, DU 41 , 42 and I or TRP 10 of the kind shown in Fig. 2 which is adapted to provide functionality in accordance with the principles described.
  • a TRP 10 as shown in Fig. 2 comprises, as a simplified representation, a wireless transmitter 30, a wireless receiver 32 and a controller or controlling processor 34 which is configured to control the transmitter 30 and the receiver 32 to transmit radio signals to and receive radio signals from one or more UEs 14 within a cell 12 formed by the TRP 10.
  • an example UE 14 is shown to include a corresponding wireless transmitter 49, wireless receiver 48 and a controller or controlling processor 44 which is configured to control the transmitter 49 to transmit signals representing uplink data to the wireless communications network via the wireless access interface formed by the TRP 10 and the receiver 48 to receive downlink data as signals transmitted by the transmitter 30.
  • the transmitters 30, 49 and the receivers 32, 48 may include radio frequency filters and amplifiers as well as signal processing components and devices in order to transmit and receive radio signals in accordance, for example, with the 5G/NR standard.
  • the controllers 34, 44 (as well as other controllers described in relation to examples and embodiments of the present disclosure) may be, for example, a microprocessor, a CPU, or a dedicated chipset, etc., configured to carry out instructions which are stored on a computer readable medium, such as a non-volatile memory.
  • the processing steps described herein may be carried out by, for example, a microprocessor in conjunction with a random access memory, operating according to instructions stored on a computer readable medium.
  • the TRP 10 also includes a network interface 50 which connects to the DU 42 via a physical interface 16.
  • the network interface 50 therefore provides a communication link for data and signalling traffic from the TRP 10 via the DU 42 and the CU 40 to the core network 20.
  • the interface 46 between the DU 42 and the CU 40 is known as the F1 interface which can be a physical or a logical interface.
  • the F1 interface 46 between CU and DU may operate in accordance with specifications 3GPP TS 38.470 and 3GPP TS 38.473 and, for example, may be formed from a fibre optic or other wired high bandwidth connection.
  • the connection 16 from the TRP 10 to the DU 42 is fibre optic.
  • the connection between a TRP 10 and the core network 20 can be generally referred to as a backhaul, which comprises the interface 16 from the network interface 50 of the TRP 10 to the DU 42 and the F1 interface 46 from the DU 42 to the CU 40.
  • the coupling loss (CL) between a UE (e.g. a UE 14) and a gNB (which is an example of a TRP 10) is considered.
  • the CL depends largely on the distance between the UE and gNB but also on any obstacles such as buildings, traffic, foliage, etc. that happen to be located in the line of sight between the UE and gNB.
  • the CL may also be influenced by propagation conditions such as fading due to precipitation and Doppler spread due to UE mobility.
  • On the DL (downlink) coverage can be improved by transmitting more power from the gNB.
  • the UL (uplink) the UE can also increase transmit power. However, the more power a UE transmits, the faster its battery will be drained. Therefore, if a UE is to transmit more power in coverage-limited situations, there is a desire for this to be done as efficiently as possible in order to reduce the drain on the UE battery.
  • NR-capable UEs support both CP-OFDM (Cyclic Prefix - Orthogonal Frequency Division Multiplexing) and DFT-S-OFDM (Discrete Fourier Transform - Spread - Orthogonal Frequency Division Multiplexing) as UL transmission waveforms.
  • the gNB selects the waveform to be used for UL transmissions and informs the UE via SIB1 (System Information Block 1) (for Message 3 (Msg3) of the initial access procedure) and semi-statically via RRC (Radio Resource Control) signalling (for both dynamic and configured grant PUSCH (Physical Uplink Shared Channel) transmissions).
  • SIB1 System Information Block 1
  • RRC Radio Resource Control
  • DFT-S-OFDM is similar to single carrier waveforms in having a lower peak-to-average power ratio (PAPR) than the multi-carrier CP-OFDM waveform.
  • a transmitter using DFT-S-OFDM can therefore operate its output power amplifier at its non-linear characteristic region without fear of excessive waveform clipping because of the low PAPR nature of DFT-S-OFDM that produces a low Adjacent Channel Leakage Power Ratio (ACLR).
  • ACLR Adjacent Channel Leakage Power Ratio
  • the UE can operate with a lower maximum power reduction (MPR) factor than a UE transmitting CP-OFDM.
  • MPR maximum power reduction
  • DFT-S-OFDM transmits more power (for example, in some cases as much as 1 ,5dB) than a UE using CP-OFDM.
  • the use of DFT-S-OFDM therefore allows a given UE to achieve a higher maximum output power for its class very efficiently whilst saving battery power.
  • DFT-S-OFDM does not support MIMO (multiple-input and multiple-output)
  • cross spatial interference is reduced, meaning that for the same UE transmit power, DFT-S-OFDM can have significantly more coverage than CP-OFDM.
  • PAPR reduction it is therefore desirable for PAPR reduction to be achieved for CP-OFDM so the benefits of CP- OFDM can be enjoyed in coverage extension (e.g. by allowing UE transmit power amplifier(s) to transmit more power to increase coverage) without unduly draining the UE battery. It is also desirable, for example, to allow a UE with CP-OFDM configured as its UL waveform and needing to increase its coverage (for example, because it is about to fall out of acceptable coverage) to apply PAPR reduction for either all UL transmissions or only those that are out of coverage (noting that higher data rate UL transmissions might be out of coverage while lower data rate UL transmissions might be in coverage).
  • CP-OFDM is a multi-carrier modulation scheme and so suffers from a higher PAPR.
  • a higher PAPR signal is characterized by occasional peaks that are significantly higher than the normal (e.g. average) amplitude of the signal. When such peak amplitudes go through a transmit power amplifier of a UE, the amplifier limits the rapid excursion resulting in clipping the peak thereby degrading the error vector magnitude (EVM) of the signal and producing spills of interference into adjacent channels to cause adjacent channel interference (ACI).
  • EVM error vector magnitude
  • ACI decreases the ACLR of the channel concerned.
  • Peak-to-average power ratio (PAPR) reduction can reduce the amplitude of such peaks by limiting the amount and rate of amplitude excursions that create such peaks.
  • the peaks in a multi-carrier modulated signal arise when a number of the subcarriers that comprise the signal cohere in such a manner that their individual contributions to the amplitude of a given time domain sample of the OFDM symbol waveform combine constructively. If such a constructive combination between subcarriers is reduced, then the amplitude of the peak will also be reduced.
  • tone reservation entails excluding the amplitude contributions of some of the contributing subcarriers from the signal altogether.
  • tone reservation a fraction of tones (subcarriers) allocated to a UE will be reserved for the UE to use in shaping its output OFDM symbol waveform to reduce the amplitudes of any peaks of the waveform. No data is transmitted on these tones. If such reserved tones match the OFDM subcarriers that contribute a high proportion of the amplitude contributions that cohere to create the peaks, this allows the peak(s) to be reduced.
  • tone reservation can also be done by loading the reserved tones with calculated complex samples.
  • Complex samples are complex values that are not indicative of information to be transmitted but, rather, are determined to help depress the amplitude excursions that create the peaks.
  • Complex samples may be calculated or determined using any suitable approach. For example, an iterative approach may be used in which different candidate complex samples (e.g. -1 +j, 1 +j, etc.) are inserted into each reserved tone and the combination of candidate complex sample(s) which minimise the PAPR are selected as the complex sample(s).
  • the UE To reduce peak(s) in this way, it is desirable for the UE to know which subcarriers contribute the most amplitude to a given peak and how many of such subcarriers the UE should tone reserve.
  • the PAPR reduction may be further improved by loading the reserved tones with complex values that help to reduce the PAPR.
  • the reserved tones are signalled by the UE to the gNB in a suitable manner, taking into account that tones are reserved per OFDM symbol and the TDRA (Time Domain Resource Allocation) of one PUSCH (or other UL channel) may span multiple OFDM symbols.
  • the more subcarriers there are in one OFDM symbol corresponding to the number of PRBs (Physical Resource Blocks) in each FDRA (Frequency Domain Resource Allocation)
  • PRBs Physical Resource Blocks
  • FDRA Frequency Domain Resource Allocation
  • a solution is therefore desirable for both selecting the reserved tones and deciding the number of reserved tones per FDRA.
  • one method of deciding which tones to reserve is to carry out an iterative process akin to a full search.
  • transport processing 401 of a transport block (TB) 407 is followed by a mapping to PRB resource elements within the FDRA by an OFDM modulation step 403.
  • tone reservation When tone reservation (TR) is enabled, however, a tone reservation step 402 is inserted prior to the OFDM modulation step 403.
  • the tone reservation step 402 receives, in addition to the transport processed complex values from the transport processing step 401 , a TR pattern 408.
  • the TR pattern indicates which REs (resource elements) in the FDRA should be reserved for the purposes of PAPR reduction.
  • a zero (or a calculated complex sample) is inserted in the stream of transport processed complex values.
  • the multiplex of zeros and/or calculated complex samples and transport processed complex values then goes through the OFDM modulation process at the OFDM modulation step 403 to generate an OFDM symbol.
  • the time domain OFDM symbol peaks are measured and any peak exceeding a set threshold (the setting of this threshold determines the amount of PAPR tolerable and is configured in advance, for example) is clipped back to the PAPR threshold.
  • the peak-clipped OFDM symbol then goes through an OFDM demodulation process at OFDM demodulation step 405.
  • EVM error vector magnitude
  • an optimum EVM threshold may be configured in advance. In this case, the first TR pattern which produces an EVM below this threshold is chosen and the untried remaining patterns ignored.
  • the gNB when TR is used, the gNB will allocate more REs than just those needed to carry the TB (transport block) since not all the REs in the expanded FDRA are used for transmitting data. Therefore, TR may generally involve increasing the bandwidth of the UL channel by the number of reserved tones. If the gNB knows whether or not the UE should activate TR (e.g. based on whether or not the UE is implementing coverage extension), it can execute the FDRA including the additional frequency domain resources needed for tone reservation.
  • TR is applied in a manner that is transparent to the gNB and so the used TR pattern does not need to be signalled.
  • the UE punctures the data modulated on its chosen reserved tones.
  • the tone reservation step 402 in Fig. 4 replaces the transport processed complex values received from the transport processing step 401 that coincide with reserved tones with zeros (this may be referred to as zeroing the reserved tones).
  • the gNB then decodes the overwritten tones in much the same way as it decodes erasures (thus, for example, a low LLR (log-likelihood ratio) value would be received and this low LLR value would act like an erasure). This is because the gNB doesn’t know the reserved tones in advance if the TR pattern used has not been signalled to the gNB.
  • the gNB may treat the reserved tones as actual erasures, thereby achieving a performance improvement. For example, if the gNB knows which tones have been reserved but those tones are still subject to noise, the gNB may adjust the LLR values associated with those tones to compensate for the noise.
  • the gNB is thus able to handle zeroed reserved tones whether or not the TR pattern is known by the gNB in advance.
  • the TR pattern is known in advance, improved performance may be achieved. If the UE sufficiently limits the number of tones punctured in this way (that is, so the tone reservation pattern is coarse enough), the transmission will still be decodable. Given that the UE is meant to apply TR only when it needs coverage extension, it is noted that additional degradation of the transmission by puncturing may not meet BLER (block error rate) and latency requirements for some services. Also, a coarse TR pattern may achieve only a small amount of PAPR reduction. Nonetheless, this example allows a UE to decide on a tone reservation pattern on its own and not have to signal the tone reservation pattern to the gNB. If sufficient coverage extension can be achieved with this technique, it is therefore beneficial for reducing the network signalling overhead.
  • a set of tones of a TR pattern is preselected either in the specification(s) (e.g. 3GPP specification(s)) or are configured by the network for each UE via, for example, system information, RRC or MAC CE (Medium Access Control - Control Element).
  • a pattern of reserved tones is used in selecting tones to be reserved by the UE when it needs to engage coverage extension by PAPR reduction (that is, the UE selects one or more of the preselected tones of the pattern of reserved tones).
  • This scheme may achieve a lower amount of PAPR reduction for some OFDM symbols. However, it improves simplicity and reduces the network signalling overhead since the UE does not need to report its TR pattern to the network.
  • the pattern of reserved tones (which are preselected as described above, for example) within a PRB is ⁇ 1 ,4,7,10 ⁇ .
  • This pattern indicates that the UE can tone reserve (puncture) any one of tones 1 or 4 or 7 or 10 within a PRB.
  • the network may also signal how many tones the UE is allowed to reserve.
  • the gNB may signal that the UE may reserve one tone from the tone reservation pattern. The UE may therefore make four different tone reservations and the gNB therefore makes 4 different attempts to decode a signal received from the UE.
  • the gNB could alternatively signal that the UE may reserve up to two tones from the tone reservation pattern, three tones, etc. In any case, the gNB knows the locations of the tones that the UE is able to reserve and how many tones the UE is able to reserve, and is thus able to make a corresponding set of decoding attempts
  • more than one set of TR patterns is preconfigured or signalled to the UE.
  • the UE then chooses the pattern of reserved tones that leads to the lowest PAPR (or the first pattern found to be associated with a PAPR below a predetermined threshold, for example) and transmits using that pattern.
  • the gNB then blind decodes according to the possible tone reservation patterns that the UE could have used. For example, if the UE had been signalled that it can apply one of four possible tone reservation patterns, the gNB can make 4 different attempts to decode the signal from the UE, each attempt using a different hypothesis of the tone reservation pattern that the UE had used. For example, in each decoding attempt, the gNB may apply erasures to the tones reserved according to the hypothesis.
  • Table 1 show an example set of tone reservation patterns where the tones that are reserved are set to zero.
  • the table has four entries, where each entry is associated with a pattern ID.
  • one of the entries in the table could indicate that no tone reservation is applied.
  • Table 2 shows an example set of tone reservation patterns where the tones that are reserved can either be zero-ed (punctured) or transmitted with a predetermined constellation point (or more generally with a predetermined complex value - the predetermined complex value does not necessarily have to align with a constellation point).
  • the table has four entries, where each entry is associated with a pattern ID.
  • Table 2 Example set of tone reservation patterns with both zero-ed tones and tones with a known constellation point
  • the set of tone reservation patterns can comprise pattern(s) of a single tone within the PRB and/or multiple tones within the PRB (as exemplified in Table 1) and each tone reservation pattern is also indicative of whether each of its tone(s) are zero-ed (punctured) or reserved to transmit known constellation point(s) or complex value(s) when that tone reservation pattern is selected (as exemplified in Table 2).
  • the gNB indicates whether the UE should perform tone reservation or not.
  • the gNB may also implicitly indicate whether tone reservation is performed or not.
  • the gNB may indicate a predetermined UE Tx (transmission) power threshold to the UE which, when exceeded by the UE (indicating coverage extension is potentially required), causes the UE to implement tone reservation.
  • UE Tx transmission
  • tone reservation is not performed since the PAPR is expected to be smaller for a transmission using a smaller number of frequency resources.
  • tone reservation is not performed.
  • a second predetermined threshold e.g. as preconfigured at the UE according to the specification(s) (e.g. 3GPP specification(s)) or signalled to the UE by the gNB in advance
  • tone reservation is not performed.
  • the second predetermined threshold is greater than the first predetermined threshold.
  • a tone reservation configuration indicates, for all PRBs in the FDRA, which and how many subcarriers amongst the 12 subcarriers should be tone reserved.
  • the TR configuration may indicate “7” meaning that, for all PRBs in the FDRA, the 7th tone is reserved.
  • the signalling to the gNB to indicate which tone is reserved per PRB requires only 4 bits.
  • signalling to the gNB to indicate which tone is reserved would require log2(N) bits (rounded to the next highest integer, if necessary). For example, if the single reserved tone can only be chosen from one of 4 possible tones, then the signalling will require only 2 bits.
  • the same numbered subcarriers are reserved for all PRBs in the FDRA.
  • the TR pattern candidates can be held in a codebook.
  • the codebook entries are vectors of subcarrier positions that are tone reserved.
  • the address of the pattern in the codebook resulting in the lowest EVM may be signalled to the gNB, which then retrieves the TR pattern at the same address from a copy of the same TR pattern codebook stored in its memory (the memory being comprised in controller 34, for example). If there are C patterns in the codebook, this signalling requires log2(C) bits (rounded to the next highest integer, if necessary).
  • Indicating the TR patterns in a codebook allows a more versatile TR as the spacing between reserved tones does not need to be uniform and one PRB may have different reserved tone(s) (if any) to another PRB. A more versatile distribution of reserved tones may produce a greater PAPR reduction for the minimum EVM. Table 3 shows an example of such a tone reservation codebook.
  • the size of the codebook may be reduced by ensuring that each entry in the codebook comprises a set of N numbers for each respective PRB in the particular BWP (bandwidth part).
  • N (1 ⁇ N ⁇ 12) is the maximum number of subcarriers in a given PRB that can be tone reserved.
  • This mechanism can be exploited to design a tone reservation pattern codebook that is wide enough for the maximum number of REs in the widest possible bandwidth BWP for NR but which can also be applied to BWPs with lower bandwidth. For BWPs with lower bandwidth, when each codebook entry is used, only the maximum number of REs in the current BWP are considered.
  • the value of N (number of subcarriers in each PRB which can be subjected to tone reservation) can be configurable.
  • the set of reserved tones for each PRB within the BWP for each codebook entry can be constructed as a set of bitmaps.
  • An example of such an alternative construction for the codebook of Table 4 is shown in Table 5.
  • each bit of the 12-bit bitmap represents a subcarrier.
  • a “0” denotes a subcarrier which is not subject to tone reservation and a “1” denotes a subcarrier that is subject to tone reservation (the character breaks the bitmap into 4-bit sub-strings for the sake of readability of Table 5 but does not affect the bitmap itself).
  • the reserved tones are indicated in the codebook of Table 4 as ⁇ 2,8 ⁇ , indicating that the 2 nd and 8 th tones are reserved.
  • each entry in a codebook may indicate any number of tone reservations for each of one or more PRBs.
  • the frequency granularity of the examples in Tables 3, 4 and 5 is defined on a PRB basis, i.e. the TR applies to all subcarriers in a PRB, other frequency granularities are also applicable, e.g. RBG (resource block group) or any predefined number of subcarriers, such as 3, 6 or 9 subcarriers.
  • RBG resource block group
  • the gNB may schedule more than 4 PRBs, i.e. more PRBs than indicated in the codebook in Tables 3, 4, and 5.
  • the PRB patterns may also be repeated.
  • codebook tables can be stored in the communications device (e.g. in a memory comprised in controller 44).
  • the entries in the codebook tables can either be fixed in the specification(s) (e.g. 3GPP specification(s)) or signalled to the UE (using, for example, a suitable one of the previously-described signalling techniques, such as via the UL Grant for dynamic PUSCH I DL Grant for PUCCH, via the activation DCI for Type 2 CG - PUSCH or semi- statically via RRC configuration - such signalling techniques may also be used for signalling one or more pattern ID(s) like those of Tables 1 or 2 or signalling a number of tones of a predetermined tone reservation pattern to be reserved, for example).
  • a suitable one of the previously-described signalling techniques such as via the UL Grant for dynamic PUSCH I DL Grant for PUCCH, via the activation DCI for Type 2 CG - PUSCH or semi- statically via RRC configuration - such signalling techniques may also be used
  • the reserved tone position is cyclically shifted within the affected PRB by a configurable shift S.
  • S can be configured by the network as part of the configuration for TR or specified in the specification(s) (e.g. 3GPP specification(s)) .
  • the TR pattern results in a reserved tone colliding with such a critical signal, the cyclic shift is also performed to find the location of the shifted tone.
  • Type 0 FDRA uses a bitmap in the DCI to signal which Resource Block Groups (RBGs) in the BWP are to be occupied by the UL transmission.
  • An RBG comprises a number of consecutive PRBs. The number of PRBs in each RBG depends on the bandwidth of the BWP. Since a bitmap is used, RBGs in the FDRA do not have to be consecutive.
  • Type 1 FDRA a consecutive L PRBs are allocated for the UL transmission and the number of the starting PRB and L are combined into a resource indication value (RIV) and signalled in the DCI.
  • RMV resource indication value
  • the gNB schedules more frequency resources than required for the UL transmission (of a targeted code rate). These extra frequency resources are used to compensate for tone reservation, since reserved tones cannot carry information I coded bits. For the purposes of TR for PAPR reduction, the gNB needs to consider the reserved tones when it does FDRA.
  • the gNB knows that the UE is to apply TR (e.g. because the gNB knows the UE is in coverage extension mode) and also knows the amount of required resources for transmitting the TB. The gNB thus takes this into account for FDRA and allocates more frequency domain resources to the UE whether configured for Type 0 or Type 1 FDRA. Thus, for example, if the TR is to apply to 3 out of 12 subcarriers which cannot then be used for carrying information (corresponding to 25% of the subcarriers), the gNB may allocate 25% extra frequency domain resources to the UE to compensate for this.
  • the gNB may schedule N extra subcarriers I PRBs, where N is the maximum or expected number of reserved tones. If the UE then signals which tones are reserved, the unused extra frequency resources can be punctured or padded (padding meaning repeating a known modulated symbol or combination of symbols, for example). The unused extra frequency resources may be mapped to known I predefined locations (e.g. at the end or start of the normal scheduled frequency resources). The gNB may indicate to the UE the number of extra frequency resources being scheduled. The gNB may also indicate whether or not it schedules extra frequency resources for tone reservation.
  • the gNB may not always have extra frequency resources available and this therefore provides flexibility to the gNB scheduler managing its resources.
  • the UE may not implement TR until extra frequency resources become available again (as indicated by the gNB). This may be appropriate if, for example, the UE wishes to retain a targeted code rate and this would not be possible if TR were implemented without extra frequency resources being made available to compensate for the reserved tones.
  • Some UL transmissions may last for more than one OFDM symbol.
  • the calculation to determine the best set of reserved tones is done only once and then the set of reserved tones is applied to all OFDM symbols in the TDRA.
  • different calculated complex values may be loaded in the reserved tones, the resulting OFDM symbol peak-clipped and the EVM measured. This allows the calculated complex values to be iteratively adjusted to improve the PAPR over successive OFDM symbols.
  • the TR pattern may be cyclically shifted from one OFDM symbol to the other with the amount of shift specified in the specification(s) (e.g. 3GPP specification(s)) or configured by the gNB (e.g. via system information).
  • This cyclical shift helps alleviate any consistent voiding of particular subcarriers over successive symbols due to TR. For instance, on a link subject to frequency selective fading, this cyclic shifting will have the effect of shuffling the subcarrier number of data-carrying (that is, non-reserved) subcarriers that would otherwise consistently lie in a section of the spectrum subjected to a frequency fade while the TR subcarrier(s) occupied a section of the spectrum subject to a frequency crest.
  • This shuffling thus helps improve the BLER for data reception at the gNB.
  • only one TR pattern may be signalled and the shift may either be specified in the specification(s) (e.g. 3GPP specification(s)) or signalled.
  • the UE may determine the shift on its own and the gNB then blind decodes for the shift applied.
  • a different tone reservation pattern is determined for each OFDM symbol in the TDRA.
  • this provides an improved PAPR reduction for all OFDM symbols in the TDRA.
  • the transport block size (TBS) for UL channels in coverage-challenged regions are usually smaller and therefore the number of OFDM symbols in the TDRA is usually smaller. The increase in computation and signalling amount may therefore be reduced.
  • the optimum TR pattern is only known after transport and physical channel processing.
  • the UE needs to send to the gNB the TR pattern used so that the gNB is able to remove the reserved tone(s) from its transport and physical channel processing (e.g. by inserting erasures in the decoding chain). All the tones in the FDRA go through gNB physical channel processing.
  • the signalling of the TR pattern can be inserted in a manner that allows the gNB to extract it at the end of the physical channel processing.
  • the TR pattern is signalled in the choice of scrambling pattern of the DM-RS (for example, each possible TR pattern may be associated with a respective one of the selectable DM-RS scrambling patterns, this association being configured at the UE and gNB in advance).
  • the DM-RS is pre-processed by the gNB in a blind search to find the particular scrambling sequence used (and therefore the TR pattern used).
  • the TR pattern is signalled in the choice of DM-RS sequence (for example, each possible TR pattern may be associated with a respective one of the selectable DM-RS sequences, this association being configured at the UE and gNB in advance).
  • the DM-RS is pre-processed by the gNB in a blind search to find the DM-RS sequence used (and therefore the TR pattern used).
  • the TR pattern is signalled in the cyclic shift applied to the DM-RS (for example, each possible TR pattern may be associated with a respective one of selectable DM-RS cyclic shift values, this association being configured at the UE and gNB in advance).
  • the cyclic shift of the DM-RS received at the gNB is mapped to the TR pattern used.
  • the TR pattern is encoded and carried in a UCI (uplink control information) front loaded in the UL transmission.
  • the encoding may comprise a FEC (forward error correction) step.
  • FEC forward error correction
  • the TR pattern may also be carried in a UCI I PUSCH multiplex in which the UCI punctures a known number of the PUSCH-carrying resource elements.
  • the UCI can be carried in a PUCCH that is transmitted within known resources of a slot carrying a PUSCH.
  • the PUSCH can be rate-matched to a slot format that contains a PUCCH carrying a UCI that indicates the TR pattern. Since PUCCH (which carries UCI) is typically transmitted with QPSK (Quadrature Phase Shift Keying) and few bits are transmitted, coverage enhancement and tone reservation is less likely to be necessary for the UCI. UCI can therefore reliably indicate a TR pattern used for other UL transmissions (since UCI itself is not subject to tone reservation).
  • QPSK Quadrature Phase Shift Keying
  • TR pattern there may be a single TR pattern in which one or more tones indicated by the TR pattern are selected by a UE. There may also be a plurality of TR patterns from which one is selectable by the UE. All tones indicated by the selected TR pattern may then be reserved by the UE. Alternatively, one or more tones indicated by the selected TR pattern may be selected and the selected one or more tones are reserved by the UE.
  • a TR pattern should therefore be understood, in general, as indicating one or more tones (that is, subcarrier frequencies) of an OFDM symbol which are reserved so they are not used for information transmission.
  • the gNB may determine the reserved tone(s) through blind decoding (e.g.
  • the reserved tone(s) may be one or more tones of one or more predetermined TR patterns known to the UE and gNB in advance, either through the relevant specification(s) or through signalling from the gNB to the UE) or the UE may signal information indicative of the reserved tone(s) to the gNB (e.g. by the UE signalling a pattern ID or codebook entry ID of its chosen TR pattern to the gNB).
  • the reserved tone(s) may be selected as the tone(s) found to minimise the EVM and/or PAPR associated with an OFDM symbol or the tone(s) first found to bring the EVM and/or PAPR associated with an OFDM symbol below a predetermined EVM and/or PAPR threshold, for example.
  • the PAPR associated with an OFDM symbol to which TR has been applied may be determined by measuring the PAPR of the modulated version of that OFDM symbol output by the OFDM modulation step 403 in Fig. 4, for example.
  • the EVM associated with an OFDM symbol to which TR has been applied may be determined using the peak-clipped and demodulated version of that OFDM symbol output by the OFDM demodulation step 405 in Fig. 4, for example.
  • the EVM is determined at EVM measurement step 406 with respect to a transport-processed transport block (generated at transport processing step 401) used to generate the OFDM symbol to which the TR is subsequently applied.
  • Fig. 5 shows an example method according to the present technique.
  • the method is implemented by circuitry of a wireless telecommunications apparatus, such as by the controller 44, receiver 48 and/or transmitter 49 of a UE 14 or by the controller 34, receiver 32 and/or transmitter 30 of a TRP (e.g. a gNB).
  • a wireless telecommunications apparatus such as by the controller 44, receiver 48 and/or transmitter 49 of a UE 14 or by the controller 34, receiver 32 and/or transmitter 30 of a TRP (e.g. a gNB).
  • a TRP e.g. a gNB
  • the method starts at step 501 .
  • the circuitry selects, from a plurality of subcarriers (tones) of an orthogonal frequency divisional multiplexing, OFDM, symbol to be used for the transmission of information, one or more reserved subcarriers.
  • a predetermined tone reservation pattern from a plurality of selectable tone reservation patterns may be selected (e.g. based on a pattern ID as exemplified in Tables 1 or 2 or a codebook entry as exemplified in Tables 3, 4 or 5) and/or one or more subcarriers of a predetermined tone reservation pattern may be selected (e.g. selection of tone 1 or 4 or 7 or 10 from a predetermined tone reservation pattern ⁇ 1 ,4,7,10 ⁇ ).
  • the circuitry transmits a signal comprising the information using the OFDM symbol, wherein one or more subcarriers of the OFDM symbol other than the one or more reserved subcarriers are used for transmitting the information.
  • the method ends at step 504.
  • Fig. 6 shows an example method according to the present technique.
  • the method is implemented by circuitry of a wireless telecommunications apparatus, such as by the controller 44, receiver 48 and/or transmitter 49 of a UE 14 or by the controller 34, receiver 32 and/or transmitter 30 of a TRP (e.g. a gNB).
  • the method starts at step 601 .
  • the circuitry transmits an indication of one or more reservable subcarriers to another wireless telecommunications apparatus (e.g. a UE if the wireless telecommunications apparatus implementing the method is a gNB).
  • another wireless telecommunications apparatus e.g. a UE if the wireless telecommunications apparatus implementing the method is a gNB.
  • one or more predetermined tone reservation patterns may be indicated (e.g. based on pattern ID(s) as exemplified in Tables 1 or 2 or codebook entry ID(s) as exemplified in Tables 3, 4 or 5).
  • one or more subcarriers (and/or a number of subcarriers that are to be reserved) of the one or more predetermined tone reservation patterns may be indicated.
  • the circuitry receives, from the other wireless telecommunications apparatus, a signal comprising information transmitted using an orthogonal frequency divisional multiplexing, OFDM, symbol.
  • a signal comprising information transmitted using an orthogonal frequency divisional multiplexing, OFDM, symbol.
  • One or more subcarriers (tones) of the OFDM symbol other than one or more reserved subcarriers of the indicated one or more reservable subcarriers are used for transmitting the information.
  • the circuitry blind decodes the received OFDM symbol using each indicated predetermined tone reservation pattern and/or possible tone(s) of each indicated predetermined tone reservation pattern.
  • the circuitry may receive a signal indicating the one or more reserved subcarriers (e.g. through transmission of information indicative of a pattern ID or codebook entry ID). By determining the one or more reserved subcarriers, the circuitry is able to successfully decode the transmitted information (which is transmitted using the non-reserved subcarriers).
  • the method ends at step 604.
  • the present technique thus allows PAPR to be reduced when using a CP-OFDM waveform (thereby improving transmitter power efficiency) whilst alleviating an increase in network signalling overheads.
  • a wireless telecommunications apparatus comprising circuitry configured to: select, from a plurality of subcarriers of an orthogonal frequency divisional multiplexing, OFDM, symbol to be used for the transmission of information, one or more reserved subcarriers; and transmit a signal comprising the information using the OFDM symbol, wherein one or more subcarriers of the OFDM symbol other than the one or more reserved subcarriers are used for transmitting the information.
  • OFDM orthogonal frequency divisional multiplexing
  • a wireless telecommunications apparatus configured to: for each of a plurality of sets of one or more reservable subcarriers, generate a version of the OFDM symbol for transmission of the information using one or more subcarriers of the OFDM symbol other than the one or more reservable subcarriers of the set, perform peak clipping on the version of the OFDM symbol according to a predetermined peak-to-average power ratio, PAPR, and perform OFDM demodulation of the version of the OFDM symbol; select, as the one or more reserved subcarriers, the set of one or more reservable subcarriers associated with at least one of: a peak-clipped and demodulated version of the OFDM symbol associated with an error vector magnitude, EVM, determined with respect to a transport-processed transport block used to generate the OFDM symbol, the EVM being a lowest EVM or an EVM lower than an EVM threshold; a modulated version of the OFDM symbol associated with a lowest PAPR or PAPR lower
  • a wireless telecommunications apparatus configured to puncture the one or more reserved subcarriers of the OFDM symbol or transmit a predetermined complex value using the one or more reserved subcarriers of the OFDM symbol.
  • a wireless telecommunications apparatus wherein the one or more reserved subcarriers are selected by selecting one of a plurality of predetermined tone reservation patterns, each of the plurality of tone reservation patterns indicating a respective set of one or more reservable subcarriers.
  • each of the plurality of tone reservation patterns indicates whether each of the one or more reservable subcarriers in the set indicated by the tone reservation pattern are to be punctured or used to transmit a predetermined complex value.
  • a wireless telecommunications apparatus according to clause 4 or 5, wherein the plurality of predetermined tone reservation patterns are preconfigured.
  • a wireless telecommunications apparatus according to clause 4 or 5, wherein the circuitry is configured to receive an indication of the plurality of predetermined tone reservation patterns from another wireless telecommunications apparatus.
  • a wireless telecommunications apparatus according to any one of clauses 4 to 7, wherein the circuitry is configured to transmit an indication of the selected predetermined tone reservation pattern to another wireless telecommunication apparatus.
  • a wireless telecommunications apparatus 9
  • the indication is an indication of an entry of a codebook available to the wireless telecommunications apparatus and the other wireless telecommunications apparatus.
  • each codebook entry indicates one or more reservable subcarriers for each of a plurality of groups of subcarriers.
  • a wireless telecommunications apparatus according to clause 10, wherein the groups of subcarriers are physical resource blocks, PRBs.
  • a wireless telecommunications apparatus according to clause 10, wherein the groups of subcarriers are resource block groups, RBGs.
  • a wireless telecommunications apparatus wherein the selected predetermined tone reservation pattern is associated with a predetermined demodulation reference signal, DM-RS, scrambling pattern.
  • a wireless telecommunications apparatus wherein the selected predetermined tone reservation pattern is associated with a predetermined demodulation reference signal, DM-RS, sequence.
  • a wireless telecommunications apparatus wherein the selected predetermined tone reservation pattern is associated with a predetermined demodulation reference signal, DM-RS, cyclic shift.
  • a wireless telecommunications apparatus wherein the selected predetermined tone reservation pattern is indicated using uplink control information, UCI.
  • a wireless telecommunications apparatus wherein the one or more reserved subcarriers are selected from a set of reservable subcarriers indicated by a predetermined tone reservation pattern.
  • a wireless telecommunications apparatus according to clause 17, wherein the circuitry is configured to receive an indication of the predetermined tone reservation pattern from another wireless telecommunications apparatus.
  • a wireless telecommunications apparatus according to any one of clauses 17 to 19, wherein the circuitry is configured to receive an indication of a number of reserved subcarriers to be selected from another wireless telecommunications apparatus.
  • a wireless telecommunications apparatus wherein the OFDM symbol is one of a plurality of OFDM symbols used to transmit the information, and the circuitry is configured to: select the same one or more reserved subcarriers for each OFDM symbol; and transmit different predetermined complex values using the one or more reserved subcarriers for different OFDM symbols.
  • a wireless telecommunications apparatus according to any one of clauses 1 to 20, wherein the OFDM symbol is one of a plurality of OFDM symbols used to transmit the information, and the circuitry is configured to select a different set of one of more reserved subcarriers for different OFDM symbols.
  • a wireless telecommunications apparatus comprising circuitry configured to: transmit an indication of one or more reservable subcarriers to another wireless telecommunications apparatus; and receive, from the other wireless telecommunications apparatus, a signal comprising information transmitted using an orthogonal frequency divisional multiplexing, OFDM, symbol, wherein one or more subcarriers of the OFDM symbol other than one or more reserved subcarriers of the indicated one or more reservable subcarriers are used for transmitting the information.
  • OFDM orthogonal frequency divisional multiplexing
  • a wireless telecommunications apparatus according to clause 23, wherein the one or more reserved subcarriers of the OFDM symbol are punctured or used to transmit a predetermined complex value.
  • a wireless telecommunications apparatus according to clause 23 or 24, wherein indicating the one or more reservable subcarriers comprises indicating one or more predetermined tone reservation patterns, each of the one or more tone reservation patterns indicating a respective set of one or more reservable subcarriers.
  • each of the plurality of tone reservation patterns indicates whether each of the one or more reservable subcarriers in the set indicated by the tone reservation pattern are to be punctured or used to transmit a predetermined complex value.
  • a wireless telecommunications apparatus according to clause 25 or 26, wherein a plurality of predetermined tone reservation patterns are indicated and the circuitry is configured to receive an indication of one of the predetermined tone reservation patterns from the other wireless telecommunication apparatus.
  • a wireless telecommunications apparatus according to clause 27, wherein the indication of the one of the predetermined tone reservation patterns is an indication of an entry of a codebook.
  • each codebook entry indicates one or more reservable subcarriers for each of a plurality of groups of subcarriers.
  • the groups of subcarriers are physical resource blocks, PRBs.
  • a wireless telecommunications apparatus according to clause 29, wherein the groups of subcarriers are resource block groups, RBGs.
  • a wireless telecommunications apparatus configured to receive a demodulation reference signal, DM-RS, with a scrambling pattern associated with the one of the predetermined tone reservation patterns.
  • a wireless telecommunications apparatus according to clause 27, wherein the circuitry is configured to receive a demodulation reference signal, DM-RS, sequence associated with the one of the predetermined tone reservation patterns.
  • a wireless telecommunications apparatus configured to receive a demodulation reference signal, DM-RS, with a cyclic shift associated with the one of the predetermined tone reservation patterns.
  • a wireless telecommunications apparatus according to clause 27, wherein the circuitry is configured to receive uplink control information, UCI, indicating the one of the predetermined tone reservation patterns.
  • a wireless telecommunications apparatus according to any one of clauses 23 to 35, wherein the circuitry is configured to transmit an indication of a number of reserved subcarriers.
  • a wireless telecommunications apparatus according to any one of clauses 23 to 36, wherein the OFDM symbol is one of a plurality of OFDM symbols used to transmit the information, each of the plurality of OFDM symbols having the same one or more reserved subcarriers transmitting different predetermined complex values.
  • a wireless telecommunications apparatus according to any one of clauses 23 to 37, wherein the OFDM symbol is one of a plurality of OFDM symbols used to transmit the information, each of the plurality of OFDM symbols having a different set of one of more reserved subcarriers.
  • a wireless telecommunications apparatus according to any one of clauses 23 to 38, wherein the circuitry is configured to transmit, to the other wireless telecommunications apparatus, an explicit or implicit indication of whether or not one or more subcarriers of the OFDM symbol are to be reserved.
  • a wireless telecommunications apparatus according to any one of clauses 23 to 39, wherein the circuitry is configured to schedule additional frequency resources for the other wireless telecommunications apparatus according to a predetermined code rate and a number of subcarriers to be reserved.
  • 41 A method of controlling a wireless telecommunications apparatus, the method comprising: selecting, from a plurality of subcarriers of an orthogonal frequency divisional multiplexing, OFDM, symbol to be used for the transmission of information, one or more reserved subcarriers; and transmitting a signal comprising the information using the OFDM symbol, wherein one or more subcarriers of the OFDM symbol other than the one or more reserved subcarriers are used for transmitting the information.
  • OFDM orthogonal frequency divisional multiplexing
  • a method of controlling a wireless telecommunications apparatus comprising: transmitting an indication of one or more reservable subcarriers to another wireless telecommunications apparatus; and receiving, from the other wireless telecommunications apparatus, a signal comprising information transmitted using an orthogonal frequency divisional multiplexing, OFDM, symbol, wherein one or more subcarriers of the OFDM symbol other than one or more reserved subcarriers of the indicated one or more reservable subcarriers are used for transmitting the information.
  • OFDM orthogonal frequency divisional multiplexing
  • a machine-readable medium in particular, a non-transitory machine-readable medium
  • software such as an optical disk, a magnetic disk, semiconductor memory or the like
  • the present disclosure should be understood to include a non-transitory storage medium comprising code components which cause a computer to perform any of the disclosed method(s).
  • Described embodiments may be implemented in any suitable form including hardware, software, firmware or any combination of these. Described embodiments may optionally be implemented at least partly as computer software running on one or more computer processors (e.g. data processors and/or digital signal processors).
  • the elements and components of any embodiment may be physically, functionally and logically implemented in any suitable way. Indeed, the functionality may be implemented in a single unit, in a plurality of units or as part of other functional units. As such, the disclosed embodiments may be implemented in a single unit or may be physically and functionally distributed between different units, circuitry and/or processors.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

Un appareil de télécommunication sans fil comprend un ensemble circuit configuré pour : sélectionner, parmi une pluralité de sous-porteuses d'un symbole de multiplexage par répartition orthogonale de la fréquence (OFDM) à utiliser pour la transmission d'informations, une ou plusieurs sous-porteuses réservées ; et transmettre un signal comprenant les informations à l'aide du symbole OFDM, une ou plusieurs sous-porteuses du symbole OFDM autres que la ou les sous-porteuses réservées étant utilisées pour transmettre les informations.
PCT/EP2023/084597 2022-12-19 2023-12-06 Réduction de papr par réservation de tonalité Ceased WO2024132538A1 (fr)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2056553A1 (fr) * 2007-10-31 2009-05-06 Panasonic Corporation Réservation de tonalité dynamique pour la réduction de PAPRb
US20220052895A1 (en) * 2020-08-17 2022-02-17 Qualcomm Incorporated Dynamic peak reduction tone allocation with low overhead

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2056553A1 (fr) * 2007-10-31 2009-05-06 Panasonic Corporation Réservation de tonalité dynamique pour la réduction de PAPRb
US20220052895A1 (en) * 2020-08-17 2022-02-17 Qualcomm Incorporated Dynamic peak reduction tone allocation with low overhead

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Title
"Digital Video Broadcasting (DVB): Frame structure, channel coding and modulation for a second generation digital terrestrial television broadcasting system (DVB-T2", EN302755, 2008
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"Revised WID on NR coverage enhancements", RP-210855
HOLMA HTOSKALA A: "LTE for UMTS OFDMA and SC-FDMA based radio access", 2009, JOHN WILEY AND SONS

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