WO2019170557A1 - Procédé, nœud de réseau et programme d'ordinateur permettant d'aligner des performances de portée - Google Patents

Procédé, nœud de réseau et programme d'ordinateur permettant d'aligner des performances de portée Download PDF

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Publication number
WO2019170557A1
WO2019170557A1 PCT/EP2019/055214 EP2019055214W WO2019170557A1 WO 2019170557 A1 WO2019170557 A1 WO 2019170557A1 EP 2019055214 W EP2019055214 W EP 2019055214W WO 2019170557 A1 WO2019170557 A1 WO 2019170557A1
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WIPO (PCT)
Prior art keywords
power
receiver
network node
sensitivity
packet
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English (en)
Inventor
Miguel Lopez
Dennis SUNDMAN
Leif Wilhelmsson
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Telefonaktiebolaget LM Ericsson AB
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Telefonaktiebolaget LM Ericsson AB
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/30—Transmission power control [TPC] using constraints in the total amount of available transmission power
    • H04W52/32—TPC of broadcast or control channels
    • H04W52/322—Power control of broadcast channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0008—Modulated-carrier systems arrangements for allowing a transmitter or receiver to use more than one type of modulation
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/06—TPC algorithms
    • H04W52/16—Deriving transmission power values from another channel
    • 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
    • H04L27/2603—Signal structure ensuring backward compatibility with legacy system

Definitions

  • the present disclosure generally relates to a method for a network node, such a network node, and a computer program for implementing the method on a network node.
  • the present disclosure relates to transmission of a packet including different modulations, and aligning range performance of different parts of the packet.
  • Communication systems may be organised such that a network node which, at least locally, acts as a central node for a plurality of stations or terminals.
  • the central network node may be an access point (AP) 100, e.g. operating under some variant of the IEEE 802.11 and often referred to as WiFi, which access point is in wireless operation with a plurality of stations 102.
  • AP access point
  • WiFi will be used as example for explaining the contributions by this disclosure.
  • the similar principles will be applicable also to other systems, e.g. cellular systems such as those specified by 3 rd Generation Partnership Project or professional mobile radio systems.
  • This disclosure relates to application of so called wake-up radio or wake-up receiver, often abbreviated as WUR, in stations or terminals, which implies that a dedicated radio unit or an operation mode of a radio which consumes only little energy is used for detecting a signal from a central node indicating that communication in some sense is about to commence.
  • WUR wake-up radio or wake-up receiver
  • FIG. 2 schematically illustrates an example of an architecture of a station 200 where a WUR 202 and a primary communications radio (PCR) 204 applying some variant of IEEE 802.11, e.g. IEEE 802.1 lba, shares a common antenna 206.
  • PCR primary communications radio
  • the IEEE 802.11 chipset of the PCR 204 can be switched off to preserve power.
  • the wake-up message is received by the WUR 202, it wakes up the IEEE 802.11 main radio of the PCR 204 and starts Wi-Fi communication with the AP.
  • the provision of the wake-up message is normally provided by the AP.
  • the architecture for this may be that a single entity 300 provides both wake-up message to a WUR 302 and handles communication with the PCR 304, as illustrated in Fig. 3.
  • a legacy AP 400 operates together with a separate WUR AP 402, where the legacy AP 400 provides communication with a PCR 404 and the WUR AP 402 provides the wake-up message for a WUR 406.
  • a commonly used modulation for a wake-up packet (WUP) comprising the wake-up message, i.e., the signal sent to the WUR, is on-off keying (OOK).
  • OOK is a binary modulation type of amplitude shift keying (ASK), where a logical one is represented with sending a signal (ON) whereas a logical zero is represented by not sending a signal (OFF), or vice versa.
  • ASK binary modulation type of amplitude shift keying
  • WUP is called WUR PPDU (PLCP (Physical Layer Convergence Procedure) Protocol Data unit).
  • Fig. 5 schematically illustrates an On-Off Keying, OOK, signal, which is a modulation scheme where the presence of a signal represents the ON part or state and the absence of the signal represents the OFF part or state.
  • OOK On-Off Keying
  • the ON and OFF parts could represent binary digits, or the transition between ON to OFF state and OFF to ON state could represent binary digits.
  • ASK amplitude-shift keying
  • the presence of a carrier for a specific duration represents a binary one, while its absence for the same duration represents a binary zero.
  • Some more sophisticated schemes vary these durations to convey additional information. It is analogous to unipolar encoding line code.
  • OOK is more spectrally efficient than frequency-shift keying, FSK, but more sensitive to noise when using a regenerative receiver or a poorly implemented superheterodyne receiver.
  • FSK frequency-shift keying
  • the bandwidth of a Binary Phase Shift keying, BPSK, signal and the bandwidth of OOK signal are equal.
  • Fig. 6 illustrates a data bit with value one is represented by, i.e. encoded to, a logical one followed by a logical zero, whereas a data bit with value zero is represented by a logical zero followed by a logical one.
  • the encoding can be swapped so that a data bit with value one is represented by a logical zero followed by a logical zero, etc.
  • the decoding of the Manchester coded symbol is essentially done by comparing the first and the second half of the symbols and decide in favour of a logical one if the first half of the symbol is larger than the second half of the same symbol, or vice versa.
  • ro and n represent the signal during the first and second half of the signalling interval, respectively.
  • the average signal level will be removed and thus have no impact on the metric used for making the decision.
  • Manchester coded OOK is being standardized within the IEEE 802.1 lba task group (TG).
  • TG 802.1 lba develops a standard for wake-up radios (WUR), targeting to significantly reduce the power consumption in devices based on the 802.11 standard.
  • WUR wake-up radios
  • IFFT inverse fast Fourier transform
  • this block is already available in Wi-Fi transmitters supporting e.g. 802.1 la/g/n/ac.
  • an approach discussed for generating the OOK is to use the 13 sub-carriers in the centre, and then populating these with some signal to represent ON and to not transmit anything at all to represent OFF.
  • Fig. 7 illustrates such an approach, where Tz and T NZ denote the time when the ON signal is zero and non-zero, respectively.
  • Tz and T NZ denote the time when the ON signal is zero and non-zero, respectively.
  • the potential improvement comes from that the same energy is received during time T NZ , i.e., a shorter time than half the bit time, T b / 2, the duration of the ON signal in the classic OOK signal with duty cycle 0.5. Since the noise power is proportional to that time, the signal-to-noise ratio, SNR, is increased correspondingly. Hypothetically, the SNR can in this way be made infinite. This is impossible in practice though. There are technical and regulatory aspects that may prevent the SNR from becoming arbitrarily large.
  • IFFT inverse fast Fourier transform
  • this block is already available in Wi-Fi transmitters supporting e.g. 802.1 la/g/n/ac.
  • IFFT inverse fast Fourier transform
  • an approach discussed for generating the OOK is to use the 13 sub-carriers in the centre, and then populating these with some signal to represent ON and to not transmit anything at all to represent OFF.
  • This approach differs slightly from traditional OOK in that multiple carriers are used to generate the ON part. Therefore, the OOK scheme being standardized in 802.1 lba is referred to as multicarrier OOK (MC-OOK).
  • MC-OOK multicarrier OOK
  • the IFFT has 64 points and is operating at a sampling rate of 20 MHz, and just as for ordinary orthogonal frequency division multiplexing (OFDM) a cyclic prefix (CP) is added after the IFFT operation in order to keep the OFDM symbol duration used in 802.1 la/g/n/ac.
  • OFDM orthogonal frequency division multiplexing
  • CP cyclic prefix
  • Fig. 8 illustrates an example of a wake-up signal structure.
  • the structure of a wake-up signal is proposed to include an 802.11 preamble, followed by a wake-up synchronization sequence, followed by a data signal using OOK.
  • Fig. 9 shows an example of a wake-up message packet format when the WUR works together with an IEEE 802.11 chip of the PCR.
  • the legacy preamble fields L- STF (Short Training Field), L-LTF (Long Training Field) and L-SIG (Signal) fields are based on OFDM modulation and the payload part is based on On-Off Keying (OOK).
  • the legacy IEEE 802.11 preamble is inserted at the beginning of the packet in order to provide a co-existence mechanism with IEEE 802.11 legacy stations. In this way legacy stations will be able to detect the WUP and correctly defer access to the wireless medium.
  • Legacy IEEE 802.11 stations are not able to decode the OOK part of the WUP, but the legacy preamble provides a mechanism for carrier sensing.
  • the payload part there are a wake-up preamble for packet detection (and possibly other functions, e.g. to indicate the message type), a MAC header that indicates the device address and the frame body that could include some control message.
  • the wake-up message is ended with a Frame Check Sequence (FCS) that validates the received message integrity.
  • FCS Frame Check Sequence
  • the signal (or signals) that constitute an ON in the OOK part of the WUP may be chosen to have desirable properties at the transmitter or at the receiver. For example, a compact spectrum, low Peak to Average Power Ratio (PAPR), or low Cubic Metric (CM) are desirable at the transmitter, while constant envelope may be advantageous for the receiver. A compact spectrum is advantageous to fulfil out of band emission requirements, while low PAPR/CM may help control signal distortions such as clipping. A constant envelope signal may improve the performance of a matched filter at the receiver. In contrast, there is no flexibility in the design of the part of the WUP, which consists of a legacy preamble, comprising L-STF, L-LTF and SIG, and which must be exactly as required by the IEEE 802.11 standard. Fig 10 illustrates a WUP, where the OOK part is designed to have low PAPR and a restricted dynamic range.
  • PAPR Peak to Average Power Ratio
  • CM Cubic Metric
  • a problem is that the different properties of signals, i.e. for the WUR and for the PCR, may provide for a mis-alignment of coverage.
  • the WUR signal may have a longer range than the PCR signal.
  • the station may be moved so that its PCR is out of the range of the AP but its WUR remains in coverage, although the WUR and the PCR are inherently co-located. This is not desirable because the station will be able to decode a WUP, wake up the PCR, but the PCR will not be able to communicate with AP. The net result is wasted energy at the station.
  • a straightforward solution to this problem is to reduce the power of the WUP.
  • the AP decreases the WUP TX power
  • the range of the WUP is reduced, so that it does not exceed the range of the PCR.
  • the sensitivity of WUR there are concerns regarding the sensitivity of WUR. Typically, there is a trade-off between cost/energy consumption of the WUR and sensitivity.
  • a very cheap, or very energy efficient WUR may have poor sensitivity and the result may be a station with a range of the WUR shorter than the range of the PCR. These stations can’t benefit from energy savings brought about by the WUR when they are located within range of the PCR but outside of range of the WUR.
  • the disclosure is based on the understanding that misalignment in range where different modulations are used in a same packet may degrade performance.
  • a method for a network node, of wirelessly transmitting a packet comprising two parts where a first part is modulated according to a first modulation scheme and a second part is modulated according to a second modulation scheme different from the first modulation scheme, and where the first part and the second part are arranged to provide information to different receivers.
  • the receivers comprise a first set of receivers capable of receiving the first modulation scheme and another receiver capable of receiving the second modulation scheme and a first receiver of the first set of receivers and the another receiver are co-located.
  • the method comprises acquiring a sensitivity difference between sensitivity of the first receiver for receiving the first part and sensitivity of the another receiver for receiving the second part, determining a power offset based on the sensitivity difference for aligning coverage towards the co-located first and another receivers, where the power offset is a difference in average power of transmission of the first part and average power of transmission of the second part, forming the packet applying the power offset for the first and second parts, and transmitting the packet.
  • the forming of the packet by applying the power offset may comprise adjusting power of the second part with respect to a power setting for the first part.
  • the forming of the packet by applying the power offset may comprise adjusting power of the first and second parts with respect to default power settings for the first and second part.
  • the adjusting power of the second part may comprise any of changing signal amplitude of the second part digitally in a baseband circuit of the network node, or changing signal envelope of the second part by adjusting power for the second part in a power amplifier of the network node.
  • the first part may be arranged such that a first minimum output back-off is required and the second part may be arranged such that a second minimum output back-off is required, wherein the second minimum output back-off is smaller than the first minimum output back-off, and the adjusting of the power of the second part may comprise to set an average output power of the second part such that the power is below a maximum output power of a power amplifier of the network node minus the second minimum output back-off
  • the forming of the packet by applying the power offset may comprise adjusting power of the first part with respect to a power setting for the second part.
  • the first modulation may be suitable for coherent demodulation and the second modulation may be suitable for non-coherent demodulation.
  • the packet may be a wake-up packet intended for a co-located receiver arrangement where the first receiver is a receiver of a primary communication radio and the another receiver is a wake-up receiver arranged to change a power mode of the first receiver upon detection of a wake-up signal of the second part.
  • the first receiver may be arranged to operate according to IEEE 802.11, and the first part comprises a legacy IEEE 802.11 preamble and the second part comprises amplitude shift keyed data for the wake-up receiver.
  • the amplitude shift keyed data may be on-off keyed or multi-carrier on-off keyed.
  • the acquiring of the sensitivity difference may comprise retrieving stored data about difference between sensitivity of the first receiver for receiving the first part and sensitivity of the another receiver for receiving the second part.
  • the acquiring of the sensitivity difference may comprise any one of receiving, prior the transmission, information about the sensitivity difference from the first receiver, or determining based on measurements, prior the transmission, the sensitivity difference.
  • a network node arranged to wirelessly transmit a packet comprising two parts where a first part is modulated according to a first modulation scheme and a second part is modulated according to a second modulation scheme different from the first modulation scheme, and where the first part and the second part are arranged to provide information to different receivers, wherein the receivers comprises a first set of receivers capable of receiving the first modulation scheme and another receiver capable of receiving the second modulation scheme and wherein a first receiver of the first set of receivers and the another receiver are co-located.
  • the network node comprises a transmission power handler arranged to acquire a sensitivity difference between sensitivity of the first receiver for receiving the first part and sensitivity of the another receiver for receiving the second part, determine a power offset based on the sensitivity difference for aligning coverage towards the co- located first and another receivers, where the power offset is a difference in average power of transmission of the first part and average power of transmission of the second part, and form the packet applying the power offset for the first and second parts, and a transmitter arranged to transmit the packet.
  • the transmission handler may apply the power offset by adjusting power of the second part with respect to a power setting for the first part.
  • the transmission handler may apply the power offset by adjusting power of the first and second parts with respect to default power settings for the first and second part.
  • the transmitter may be arranged to adjust the power of the second part by any of changing signal amplitude of the second part digitally in a baseband circuit of the transmitter, or changing signal envelope of the second part by adjusting power for the second part in a power amplifier of the transmitter.
  • the first part may be arranged such that a first minimum output back-off is required and the second part may be arranged such that a second minimum output back-off is required, wherein the second minimum output back-off is smaller than the first minimum output back-off, and wherein the transmitter is arranged to adjust the power of the second part by setting an average output power of the second part such that the power is below a maximum output power of a power amplifier of the network node minus the second minimum output back-off
  • the transmission handler may apply the power offset by adjusting power of the first part with respect to a power setting for the second part.
  • the first modulation may be suitable for coherent demodulation and the second modulation may be suitable for non-coherent demodulation.
  • the packet may be a wake-up packet intended for a co-located receiver arrangement where the first receiver is a receiver of a primary communication radio and the another receiver is a wake-up receiver arranged to change a power mode of the first receiver upon detection of a wake-up signal of the second part.
  • the network node may comprise an access point operating according to IEEE 802.11, and wherein the first receiver is arranged to operate according to IEEE 802.11, and the first part comprises a legacy IEEE 802.11 preamble and the second part comprises amplitude shift keyed data for the wake-up receiver.
  • the amplitude shift keyed data may be on-off keyed or multi carrier on-off keyed.
  • the network node may be arranged to acquire the sensitivity difference by retrieving stored data about difference between sensitivity of the first receiver for receiving the first part and sensitivity of the another receiver for receiving the second part.
  • the network node may be arranged to acquire the sensitivity difference by any one of receiving, prior the transmission, information about the sensitivity difference from the first receiver, or determining based on measurements, prior the transmission, the sensitivity difference.
  • a computer program comprising instructions which, when executed on a processor of a network node, causes the network node to perform the method according to the first aspect.
  • Fig. 1 schematically illustrates elements of a communication system comprising a network node and stations.
  • Fig. 2 schematically illustrates an example of an architecture of a station.
  • Fig. 3 schematically illustrates an example setup for wake-up radio.
  • Fig. 4 schematically illustrates an example setup for wake-up radio.
  • Fig. 5 schematically illustrates an on-off keying signal.
  • Fig. 6 illustrates a data bit with value representation.
  • Fig. 7 schematically illustrates a modified value representation.
  • Fig. 8 illustrates an exemplary wake-up signal structure.
  • Fig. 9 illustrates an exemplary wake-up signal structure.
  • Fig. 10 is a power to time diagram illustrating preamble and wake-up signal.
  • Fig. 11 is a power to time diagram illustrating power levels after application of a power offset according to an embodiment.
  • Fig. 12 is a power to time diagram illustrating power levels after application of a power offset according to an embodiment.
  • Fig. 13 is a power to time diagram illustrating preamble and wake-up signal after application of a power offset according to an embodiment.
  • Fig. 14 is a flow chart illustrating a method according to an embodiment.
  • Fig. 15 is a block diagram schematically illustrating a network node according to an embodiment.
  • Fig. 16 schematically illustrates a computer-readable medium and a processing device.
  • the WUP shown in Figs 8 and 9, consists of two different parts.
  • the first part uses OFDM and is intended for carrier sensing/packet detection by legacy IEEE 802.11 stations different from the WUR, to which the second part is addressed.
  • the WUR is unable to detect the first part of the WUP.
  • the second part uses OOK, and can’t be decoded by legacy IEEE 802.11 stations.
  • legacy stations can’t decode the OOK part, so that increasing or decreasing the power of the OOK part has no consequence for legacy stations.
  • a WUR does not detect the legacy preamble, so that increasing/decreasing its power, relative to the OOK part, has no consequence for the WUR.
  • the WUP transmitter introduces a power offset to decrease the power of the OOK part relative to the power of the legacy preamble, as illustrated in Fig. 11. This decreases the range of the WUR relative to the PCR, without affecting the sensitivity of carrier sensing for other stations in the BSS.
  • the WUP transmitter introduces a power offset to decrease the power of the legacy preamble part relative to the power of the OOK part, as illustrated in Fig. 12.
  • the OOK part of the WUP may be designed to have lower PAPR or more restricted dynamic range than the legacy preamble part of the WUP. Therefore, the power of the OOK part can be increased without increasing out of band emissions due to e.g. clipping/compression at the PA, as shown in Fig. 13.
  • a time-domain single carrier waveform can be generated using continuous phase modulation with constant envelope and for example a 4 MHz bandwidth. Transforming this waveform to frequency domain and quantizing Fourier coefficients to for example a 256-QAM (Quadrature Amplitude Modulation) symbol for an Inverse Fast Fourier Transform (IFFT) generation of a waveform to be used for the MC-OOK, where all inactive subcarriers are nulled. For example, nulling all subcarriers except 13 contiguous subcarriers, corresponding to the desired bandwidth, provides a waveform resembling the desired constant envelope waveform.
  • IFFT Inverse Fast Fourier Transform
  • the provided on- symbol according to the respective examples has nearly constant envelope and is power distributed over the full desired bandwidth. Therefore, it can be transmitted with an output power which is higher than during a legacy preamble.
  • a corresponding example for 2 ps symbols may be to use a 32-point IFFT and a 0.4 ps cyclic prefix. Examples of achieved Fourier coefficients are given in Table 2.
  • the MC-OOK on- symbol according to this example has nearly constant envelope and power distributed over the full desired bandwidth. Therefore, it can be transmitted with an output power which is higher than during the legacy preamble.
  • Fig. 14 is a flow chart illustrating a method according to embodiments.
  • the method is performed by the network node, e.g. an AP, and the method comprises acquiring 1400 a sensitivity difference. This is generally performed by accessing a memory where the sensitivity difference is stored.
  • the information may have been stored in different ways. For example, a station provides the information when registering to the network node. The information may be implicitly provided to the network node, e.g. by the station providing information about a device class or the like, wherein the network node is able to determine the desired information. Another way is that the network node saves results of earlier measurements when communicating with the station. Based on experienced performance during operation, the network node may also update saved information.
  • the network node is able to determine 1402 a suitable power offset according to the principles demonstrated above. And when forming the WUP, power adjustment 1404 is performed. The WUP is then transmitted 1406.
  • a check 1401 based on the acquired sensitivity difference may show that there is no severe misalignment in coverage, wherein the method proceeds directly to the transmission
  • the adjustment 1404 of power is bypassed and the method proceeds with the transmission 1406 of the packet.
  • Fig. 15 is a block diagram schematically illustrating a network node 1500 according to an embodiment.
  • the network node 1500 which may be an AP or any other base station applying the principles demonstrated above, comprises an antenna arrangement 1502, a receiver 1504 connected to the antenna arrangement 1502, a transmitter 1506 connected to the antenna arrangement 1502, a processing element 1508 which may comprise one or more circuits, one or more input interfaces 1510 and one or more output interfaces 1512.
  • a memory (not shown) comprising stored sensitivity differences for stations may be provided with the processing element 1508, or be accessed via the interfaces 1510, 1512.
  • the interfaces 1510, 1512 can be operator interfaces and/or signal interfaces, e.g. electrical or optical.
  • the network node 1500 is arranged to operate as a central node, at least locally, in communication network where low-energy solutions as demonstrated above are provided by WUR.
  • the processing element 1508 being arranged to perform the embodiments demonstrated with reference to Figs 1 to 14, the network node 1500 is capable of providing a WUP where misalignment in range is reduced.
  • the processing element 1508 can also fulfil a multitude of tasks, ranging from signal processing to enable reception and transmission since it is connected to the receiver 1504 and transmitter 1506, executing applications, controlling the interfaces 1510, 1512, etc.
  • the methods according to the present disclosure is suitable for implementation with aid of processing means, such as computers and/or processors, especially for the case where the processing element 1508 demonstrated above comprises a processor handling alignment of range for the different parts of the WUP. Therefore, there is provided computer programs, comprising instructions arranged to cause the processing means, processor, or computer to perform the steps of any of the methods according to any of the embodiments described with reference to Fig.1 to 14.
  • the computer programs preferably comprise program code which is stored on a computer readable medium 1600, as illustrated in Fig. 16, which can be loaded and executed by a processing means, processor, or computer 1602 to cause it to perform the methods, respectively, according to embodiments of the present disclosure, preferably as any of the embodiments described with reference to Figs 1 to 6.
  • the computer 1602 and computer program product 1600 can be arranged to execute the program code sequentially where actions of the any of the methods are performed stepwise, or perform actions on a real-time basis.
  • the processing means, processor, or computer 1602 is preferably what normally is referred to as an embedded system.
  • the depicted computer readable medium 1600 and computer 1602 in Fig. 16 should be construed to be for illustrative purposes only to provide understanding of the principle, and not to be construed as any direct illustration of the elements.

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

Abstract

L'invention concerne un noeud de réseau, et un procédé associé, pour la transmission sans fil d'un paquet comprenant deux parties, une première partie étant modulée selon un premier schéma de modulation et une seconde partie étant modulée selon un second schéma de modulation différent du premier schéma de modulation, et la première partie et la seconde partie étant agencées afin de fournir des informations à différents récepteurs. Les récepteurs comprennent un premier ensemble de récepteurs capables de recevoir le premier schéma de modulation et un autre récepteur capable de recevoir le second schéma de modulation et un premier récepteur du premier ensemble de récepteurs et l'autre récepteur sont co-localisés. Le procédé comprend l'acquisition d'une différence de sensibilité entre la sensibilité du premier récepteur pour recevoir la première partie et la sensibilité de l'autre récepteur pour recevoir la seconde partie, la détermination d'un décalage de puissance sur la base de la différence de sensibilité pour l'alignement de la couverture vers les premier et second récepteurs colocalisés, le décalage de puissance étant une différence de puissance moyenne de transmission de la première partie et la puissance moyenne de transmission de la seconde partie, la formation du paquet appliquant le décalage de puissance pour les première et seconde parties, et la transmission du paquet.
PCT/EP2019/055214 2018-03-05 2019-03-01 Procédé, nœud de réseau et programme d'ordinateur permettant d'aligner des performances de portée Ceased WO2019170557A1 (fr)

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US20170094600A1 (en) * 2015-09-25 2017-03-30 Intel Corporation Apparatus, system and method of communicating a wakeup packet
WO2018038532A1 (fr) * 2016-08-23 2018-03-01 한국전자통신연구원 Procédé de commande d'un nœud de communication prenant en charge un mode de faible puissance dans un lan sans fil

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