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WO2024012855A1 - Procédé de prise en charge de la commutation de faisceaux, d'un premier nœud apparenté et d'un second nœud apparenté - Google Patents

Procédé de prise en charge de la commutation de faisceaux, d'un premier nœud apparenté et d'un second nœud apparenté Download PDF

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Publication number
WO2024012855A1
WO2024012855A1 PCT/EP2023/067237 EP2023067237W WO2024012855A1 WO 2024012855 A1 WO2024012855 A1 WO 2024012855A1 EP 2023067237 W EP2023067237 W EP 2023067237W WO 2024012855 A1 WO2024012855 A1 WO 2024012855A1
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WIPO (PCT)
Prior art keywords
node
length
symbol
extended
data
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PCT/EP2023/067237
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English (en)
Inventor
Kun Zhao
Erik Lennart Bengtsson
Fredrik RUSEK
Jose Flordelis
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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 WO2024012855A1 publication Critical patent/WO2024012855A1/fr
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/2605—Symbol extensions, e.g. Zero Tail, Unique Word [UW]
    • H04L27/2607—Cyclic extensions

Definitions

  • the present disclosure pertains to the field of wireless communications.
  • the present disclosure relates to a method for supporting beam switching, a related first node, and a related node.
  • the 3rd Generation Partnership, 3GPP has extended the Frequency Range 2, FR2, to 71 GHz (which is known as FR2-2), where higher subcarrier spacing, SCS, 480 kHz and 960 kHz have been specified to support larger bandwidth and mitigate the impact of higher phase noise.
  • FR2-2 higher subcarrier spacing
  • SCS higher subcarrier spacing
  • 480 kHz and 960 kHz have been specified to support larger bandwidth and mitigate the impact of higher phase noise.
  • the time duration of the Cyclic Prefix, CP may be reduced owing to the shorter symbol time of the higher SCS.
  • the beam switching time in the FR2-2 remains similar to FR2-1 due to hardware limitations.
  • the beam switching time in FR2-2 combined with the reduced time duration of the CP may inevitably cause system degradation.
  • Performance degradation is observed when the beam switching time is above 80% of the time duration of the CP (e.g., a CP length). However, the beam switching time is likely to be multiple times the time duration of the CP for the high SCSs (480 kHz and 960 kHz). Therefore, solutions are proposed in this invention.
  • the method comprises communicating, between the first node and a second node, using symbols. Each symbol has a predefined symbol duration. Each symbol comprises first data and a cyclic prefix, CP, having a predetermined CP length. The method comprises communicating, between the first node and the second node, control signalling indicative of a temporary extension of CP length in one individual symbol having the same predefined symbol duration. The method comprises communicating the individual symbol comprising second data and a CP with an extended CP length.
  • a first node comprising memory circuitry, processor circuitry, and a wireless interface is provided.
  • the first node is configured to perform any of the methods disclosed herein.
  • the disclosed method and the disclosed first node can adapt the CP length to an extended CP length that can mitigate the impact of the beam switching time on the communication of a symbol between the first node and the second node.
  • the disclosed technique can accommodate disruptions in transmission and/or reception of a symbol where a beam switch occurs. This technique advantageously does not affect or change the time structure of the wireless system, such as the symbol duration, and/or periodicity of the CP etc.
  • the disclosed method and first node allow an adaptation of the CP length so that larger delay spreads can be accommodated for.
  • the disclosed technique allows transmitting as much data as possible while maintaining the time structure and adapting to larger delay spreads.
  • the method comprises communicating, between a first node and the second node, using symbols. Each symbol has a predefined symbol duration. Each symbol comprises first data and a cyclic prefix, CP, having a predetermined CP length. The method comprises communicating, between the first node and the second node, control signalling indicative of a temporary extension of CP length in one individual symbol having the same predefined symbol duration. The method comprises communicating the individual symbol comprising second data and a CP with an extended CP length.
  • a second node comprising memory circuitry, processor circuitry, and a wireless interface is provided.
  • the second node is configured to perform any of the methods disclosed herein.
  • the disclosed method and the disclosed second node can adapt the CP length to an extended CP length that can mitigate the impact of the beam switching time on the communication of a symbol between the first node and the second node.
  • This technique advantageously does not affect or change the time structure of the wireless system, such as the symbol duration, and/or periodicity of the symbol etc.
  • the disclosed method and second node allow an adaptation of the CP length so that larger delay spreads can be accommodated for.
  • the disclosed technique allows transmitting as much data as possible while maintaining the time structure and adapting to larger delay spreads.
  • Fig. 1 is a diagram illustrating an example wireless communication system comprising an example first node and an example second node according to this disclosure
  • Figs. 2A-2B are schematic diagrams illustrating example symbols where the predetermined CP is affected by a beam switching;
  • Figs. 3A-3B are schematic diagrams illustrating example CPs having an extended CP length according to this disclosure
  • Fig. 4 shows a schematic diagram illustrating an example CP with an extended CP length according to this disclosure
  • Fig. 5-6 are signalling diagrams illustrating an example communication between an example first node acting as a transmitter, and an example second node acting as a receiver according to the disclosure;
  • Fig. 7 is a flow-chart illustrating an example method performed by a first node according to this disclosure
  • Fig. 8 is a flow-chart illustrating an example method performed by a second node according to this disclosure.
  • Figs. 9-12 are signalling diagrams illustrating example communications between an example first node acting as a transmitter, and an example second node acting as a receiver according to the disclosure;
  • Fig. 13 is a block diagram illustrating an example first node according to this disclosure
  • Fig. 14 is a block diagram illustrating an example second node according to this disclosure.
  • the present disclosure provides a technique that mitigates the effect of the beam switching time.
  • the beam switching time may be seen as the time for performing a switching of a beam by the radio and/or by the hardware.
  • the beam switching time or delay can be seen as the time to perform the beam switch (e.g., change the state of analog phase shifters).
  • the present disclosure allows for example the wireless device acting as a first node to adapt the CP length to an extended CP length that can mitigate the effect of the beam switching time.
  • the terms “beam switching time” and “beam switching delay” can be used interchangeably.
  • the present disclosure provides a technique that in some examples can be seen as introducing with the extended CP length a time gap to accommodate the beam switching time.
  • CP length can be seen as a duration of the CP in time units.
  • the extended CP length can be expressed in terms of absolute time duration.
  • the extended CP length can be converted from time units into symbol units.
  • Fig. 1 is a diagram illustrating an example wireless communication system 1 comprising an example first node 300 and an example second node 400 according to this disclosure.
  • the wireless communication system 1 may comprise one or more first nodes 300, 300A illustrated as wireless devices, and one or more second nodes 400 illustrated as a network node.
  • a first node may refer to a wireless device such as one or more of: a mobile device and a user equipment, UE.
  • a second node disclosed herein may refer to a network node, such as a radio access network node operating in the radio access network, RAN, such as a base station, an evolved Node B, eNB, gNB in NR.
  • RAN such as a base station, an evolved Node B, eNB, gNB in NR.
  • the RAN node is a functional unit which may be distributed in several physical units.
  • the first node is a wireless device while the second node is a network node. In one or more examples, the first node is a network node while the second node is a wireless device.
  • the first nodes 300, 300A may be configured to communicate with the second node 400 via a wireless link (or radio access link) 10, 10A, respectively.
  • the wireless link can be seen as a communication channel and/or a radio channel.
  • the first node is a first wireless device (such as 300) while the second node is a second wireless device (such as 300A).
  • the first wireless device (such as 300) may be configured to communicate with the second wireless device (such as 300A) via a wireless link (or radio access link) 12.
  • the first wireless device 300 may be configured to communicate with the second wireless device 300A, optionally via the network node 400.
  • the first node is configured to perform the methods disclosed herein (such as in Fig. 7).
  • the second node is configured to perform the methods disclosed herein (such as in Fig. 8).
  • One approach to mitigate beam switching delay may be to adopt a time of 200ns for beam direction change or switch for FR2-2 .
  • the switching time would become longer than the CP (75ns for 960 kHz), which is detrimental to the performance.
  • TR 38.817-02 (version 15.9.0) captured simulation results that switching time should be less than 80% of the CP length to prevent degradation to system performance.
  • One approach to accommodate this is to always force the wireless device perform beam switch on a DL UL switching gap (such as, a time required by a base station, e.g., a network node, to switch from transmission to reception of signals through a communication channel).
  • a base station e.g., a network node
  • this puts high limitations on the UE beam management and the link quality is not ensured especially when the UE moves in a relatively high speed.
  • Figs. 2A-2B are schematic diagrams 300, 350 illustrating example symbols where the predetermined CP is affected by a beam switching.
  • Fig. 2A shows a schematic diagram 300 illustrating an approach that involves inserting a beam switching gap, such as beam switching gap 306 taking place between a first beam carrying symbol 302 and a second beam carrying symbol 304.
  • Symbol 302 includes a CP 302A.
  • Symbol 304 includes a CP 304A.
  • During the beam switching time of the UE there is no transmission to/from the UE. This is essentially resource scheduling.
  • This approach is simple but has the drawback that for UEs that are always scheduled, there is a rate loss during the beam switching gap, such as beam switching gap 306.
  • Fig. 2B is a schematic diagram 350 illustrating an approach that involves the use of an extended CP.
  • the extended CP is part of the legacy standard and results in extending the symbol duration.
  • Fig. 2B shows a first symbol 358 including a CP 358A and a second symbol 360 including an extended CP 360A.
  • the extended CP 360A results in the symbol duration T of the second symbol 360 being larger than the symbol duration of the first symbol 358.
  • the use of the extended CP 360A in the symbol where the beam switch occurs may lead to a reduction in the rate loss.
  • the use of the extended CP 360A only provides protection against a beam switching time plus delay spread of the channel that does not exceed the duration of the extended CP.
  • the use of the extended CP 360A may involve an undesired change of the time structure of the system (e.g., from an interfering perspective).
  • the extension of the symbol duration due to the extended CP 360A is detrimental from a viewpoint of subcarrier spacing.
  • the present disclosure maintains the symbol duration.
  • the present disclosure provides techniques that allow, inter alia, to mitigate the beam switching time delay while not affecting the time-structure of the system (e.g., maintaining the periodicity of the symbol), and being adaptive so that channels with large delayspreads can be accommodated.
  • the present disclosure provides techniques that allow transmitting as much data as possible while not affecting the time-structure of the system (e.g., maintaining the periodicity of the symbol), and being adaptive so that channels with large delay-spreads and/or any other disruptions can be accommodated.
  • Figs. 3A-3B are schematic diagrams 400, 450 showing example CPs having an extended CP length according to this disclosure.
  • Fig. 3A shows an example illustrating carriers over a frequency spectrum 408, where B carriers 402 have been allocated.
  • the comb-structure of Figs. 3A-3B can be used for data transmissions.
  • the present disclosure allows that data and/or control signals are transmitted in a comb-fashion.
  • Fig. 3A This creates a periodic structure in the time domain illustrated in Fig.
  • Fig. 3B is a schematic diagram 450 showing a time representation of the data.
  • the disclosed CP can be generated to have a duration N/2 + N CP , where N CP is the duration of the predetermined CP which is already existing.
  • the first node is assigned to B of the subcarriers, e.g. subcarrier N 0 ,N 0 +
  • the corresponding time signal (N samples) has a periodic structure with period length as illustrated by 404A and 404B of Fig. 3A.
  • the predetermined CP e.g. generated by numerology can be inserted as illustrated by 406 based on 406A.
  • the CP with an extended CP length includes for example the predetermined CP 406 and the additional CP 404.
  • the disclosed method(s) can be applied both in uplink and in downlink.
  • the second node acting as a receiver needs only to accurately receive N/2 samples.
  • the CP according to this disclosure can address impairments introduced by the beam switching and other impairments.
  • Fig. 4 shows a schematic diagram illustrating an example implementation of the CP with extended CP length according to this disclosure.
  • Fig. 4 shows a first symbol 602 including a predetermined CP 602A, a second symbol 606, and a third symbol 604 including a predetermined CP 604A.
  • the second symbol is a result of the application of the disclosed technique.
  • the second symbol 606 includes a predetermined CP 606A, and an additional CP 606B.
  • the example implementation of Fig.4 can be seen as the insertion of an additional CP 606B (such as a virtual CP).
  • the additional CP 606B is in addition to the predetermined CP 606A.
  • a time-domain signal can be created based on the second symbol 606 with a CP of arbitrary length.
  • the idea here is to keep the duration of the predetermined CP fixed, but to manipulate what is being transmitted in the subcarriers so that an additional CP in the time-domain is obtained.
  • Fig. 4 shows the structure of three consecutive OFDM symbols in the time domain.
  • the part of the OFDM signal created by an inverse fast Fourier transform, IFFT is the piece that starts with 606B, and ends at the end of the symbol 606.
  • the content of 606B is, by construction, identical to the content of 606D.
  • the content of 606B is based on at least a part of the content of 606D for example when 606D is longer than 606A due to 606B.
  • the content of 606A is, by construction, identical to the content of 606C.
  • a prefix is also inserted (the CP) but in this case it is not the last piece of the signal, but rather 606C. Altogether, this creates an arbitrarily long CP (606A+606B). Some degrees of freedoms are naturally lost in this process (since 606B and 606D are to be identical).
  • the symbol duration of the individual symbol (denoted second symbol) 606 is the same as the symbol duration of the previous symbol (denoted first symbol) 602, and the same as the next symbol 604 (denoted third symbol).
  • the predetermined CPs 602A, 604A have the same predetermined length while the CP with extended CP length formed by 606A+606B has length that is greater than the predetermined length.
  • the content of 606A can be identical to the content of 606D, or to the last part of 606D when 606D is longer than 606A due to the restriction above that the content of 606B is, by construction, identical to the content of 606D. This can lead to less data rate.
  • B subcarriers are allocated to the first node.
  • the remaining N-B carriers are unused , and, thus, available for other first nodes.
  • the signal in the first N — B carriers can be 0. It turns out that there can only be B - L data symbols transmitted in said B subcarriers (the additional CP consumes L degrees-of-freedom).
  • N — B entries of A 0 N-Lil , or in other words, x e Null(Q H fVs).
  • the null space is of dimension B - L.
  • B - L is the number of data symbols that can be transmitted in the B subcarriers if an additional CP of length L is constructed.
  • the transmitted signal in the time domain can be e.g. N s N QS a.
  • the first node acting as the receiver can obtain K',K via control signalling.
  • a second node acting as the transmitter can receive control signalling indicating whether the samples transmitted after the beam switch can be boosted, in power, by a factor
  • the first node acting as the receiver performs the beam switch, the above is not strictly necessary, but received power can be boosted if the second node acting as the transmitter places all the transmit power on samples that will be actually received.
  • Fig. 5 is a signalling diagram 700 illustrating an example communication between an example first node 300 and an example second node 400, for enabling a CP with extended CP length during an uplink transmission where the first node is about to switch beams according to this disclosure.
  • the first node 300 is a wireless device and the second node 400 is a network node.
  • the first node 300 determines the need for performing a beam switch.
  • the first node 300 acting as a wireless device, may perform the beam switch during an uplink, UL, transmission.
  • the first node 300 needs to change a current beam pair to a new beam pair (e.g., due to changes in a channel communication propagation characteristic) that allows for an improved transmission of a symbol by the first node 300 to the second node 400.
  • the first node 300 may be instructed by the second node 400 to perform the beam switching for transmission of the symbol.
  • the first node 300 may need to adapt a predetermined CP length (e.g., a regular CP length available in the numerology) to an extended CP length to mitigate the effect of the beam switching time on the transmission of that particular individual symbol to the second node 400.
  • the first node 300 may need to transmit, to the second node 400, the individual symbol comprising second data (e.g., payload data, and/or user data) and a CP with an extended CP length.
  • control signalling may be transmitted by the first node 300 indicating to the second node 400 the use of the CP with the extended CP in the individual symbol.
  • the first node 300 transmits, to the second node 400, symbols 701.
  • Each symbol may have a predefined symbol duration.
  • Each symbol may comprise first data and a cyclic prefix, CP, having a predetermined CP length.
  • CP cyclic prefix
  • each symbol can be seen as an Orthogonal Frequency Division Multiplexing, OFDM, symbol.
  • OFDM Orthogonal Frequency Division Multiplexing
  • the symbols can be seen as OFDM symbols. This corresponds to for example S101 of Fig. 7.
  • the first node 300 transmits, to the second node 400, control signalling 706 indicative of a temporary extension of CP length in one individual symbol having the same predefined symbol duration as any preceding and following symbol.
  • the control signalling 706 indicates to the second node 400 that an extension of the CP length is to be applied in one individual symbol, with the one individual symbol while maintaining the same predefined symbol duration.
  • the one individual symbol can be seen as an OFDM symbol, where the extension of the predetermined CP length is to be applied.
  • the control signalling 706 can be seen as an indication to the second node 400 that an upcoming OFDM symbol comprises the temporary extension of the predetermined CP length.
  • the first node 300 can indicate to the second node 400 that the temporary extension of the predetermined CP length is used in the one or more upcoming OFDM symbols.
  • the temporary extension of the CP length does not extend the predefined symbol duration.
  • the individual symbol may maintain the same predefined symbol duration even when the CP length is temporarily extended.
  • the term “same predefined symbol duration” can be seen as substantially the same predefined symbol duration, such as +/- a tolerance margin.
  • the symbol duration may exhibit negligible and predetermined variations in the length of an OFDM symbol such as, for example, those described in Sec. 5.3.1 , TS 38.211 V17.1.0.
  • the present disclosure allows maintaining the same symbol duration with one or more predefined variations. This corresponds to for example S104, S104A of Fig. 7.
  • the first node 300 transmits, to the second node 400, the individual symbol 710 comprising second data and a CP with an extended CP length.
  • the CP with the extended CP length may result from the temporary extension of the predetermined CP length in the one individual symbol having the same predefined symbol duration. This corresponds to for example S106, S106A of Fig. 7.
  • the first node 300 Before transmitting the control signalling 706, the first node 300 can transmit, to the second node 400, capability signalling 702 indicative of a capability of the first node 300 to perform a beam switch.
  • the capability signalling 702 can be indicative of how fast the first node 300 can perform the beam switch (as illustrated e.g. in S102 of Fig. 7).
  • the capability signalling 702 can indicate to the second node 400, such as the network node, that the beam switch is to be applied by the first node 300 (as illustrated e.g. in S102A of Fig. 7).
  • the first node 300 may determine the need for performing the beam switch (as illustrated e.g., in S102AA of Fig. 7).
  • the first node 300 may perform a switching of a beam pair used for communication between the first node 300 and the second node 400 across a communication channel (e.g. a wireless link).
  • a communication channel e.g. a wireless link
  • the beam pair selected for communication between the first node 300 and the second node 400 may change as the communication channel propagation conditions change over time (e.g., due to one or more of: blockage, diffraction, scattering, reflections, UE mobility, and any other suitable effects).
  • the first node e.g., a wireless device
  • the second node e.g., a network node
  • the first node 300 may communicate with one or more second nodes 400 using one or more beam pairs, respectively.
  • the first node 300 may be instructed by the one or more second nodes 400 to perform the switching of the corresponding one or more beam pairs.
  • the first node 300 and the second node 400 can communicate to each other second information 704.
  • the second information may be indicative of a negotiation of one or more beam switch parameters between the first node 300 and the second node 400 (as illustrated e.g. in S103 of Fig. 7).
  • the first node 300 can transmit, to the second node 400, a request for a change in at least one sample parameter (as illustrated e.g. in S103A of Fig. 7).
  • the at least one sample parameter may be associated with a construction of the CP having the extended CP length.
  • the individual symbol 710 comprising second data and a CP with an extended CP length maintains the same symbol duration, as illustrated in Figs. 3A-3B and in Fig. 4.
  • the at least one sample parameter may comprise sample parameters that are applicable to the periodic structure and/or the content of the individual symbol.
  • the first node 300 can receive, from the second node 400, a response indicative of a change in the power associated with the second data (as illustrated e.g. in S103B of Fig. 7).
  • the change in the power associated with the second data may be applied, by the first node 300, after performing the beam switch.
  • the first node may require acquiring information on whether the second data (e.g., data samples) transmitted after performing the beam switch can be boosted in power.
  • the negotiation of one or more beam switch parameters between the first node 300 and the second node 400 may be performed when the control signalling 706 is transmitted from the first node 300 to the second node 400 (e.g., S104A of Fig.7).
  • the first node 300 can receive, from the second node 400, a response 708 accepting the temporary extension of the CP length.
  • the second node 400 may accept the reception of the temporary extension of the CP length.
  • the second node 400 may accept the reception of the individual symbol 710 comprising second data and a CP with the extended CP length.
  • the response 708 accepting the temporary extension may be comprised in the control signalling 706.
  • the response 708 accepting the temporary extension of the CP length may be transmitted via a Downlink Control Information, DCL
  • the DCI can signal the application of the CP with the extended CP length in a proper timing, such as at the individual symbol 710, such as at a symbol including the temporary extension of the CP length.
  • the response 708 accepting the temporary extension of the CP length can be transmitted, by the second node 400, to one or more first nodes 300, 300A. This corresponds to for example by S104C of Fig. 7.
  • the second node 400 can receive, from the first node 300, the individual symbol 710 comprising the second data and the CP with the extended CP length.
  • a disclosed signal processing technique is used by the second node 400 to process the individual symbol 710 comprising second data and a CP with the extended CP length.
  • the disclosed signal processing technique may enable the second node 400 to accurately recover an intended symbol. Put differently, the disclosed signal processing technique may revert the signal processing applied by the first node 300 (as transmitter of the individual symbol).
  • the disclosed signal processing technique may be indicative of a size of a fast Fourier transform, FFT, to apply over the individual symbol comprising solely the second data.
  • the disclosed signal processing technique may indicate an equalization technique (e.g., zero-forcing (ZF) equalizer and/or minimum mean-square error (MMSE)).
  • ZF zero-forcing
  • MMSE minimum mean-square error
  • the CP with the extended CP length may be removed before applying the disclosed signal processing technique.
  • the individual symbol comprising solely the second data may then be processed by the FFT, whose size can be given the size of the individual symbol comprising solely the second data.
  • the intended symbol may result from an equalization of the individual symbol comprising solely the second data processed by the FFT.
  • the individual symbol comprising solely the second data may differ from an original version of the individual symbol prior to the insertion of the CP with the extended CP length.
  • the individual symbol 710 comprising the second data and the CP with the extended CP length is associated with a loss in the data rate.
  • part of the data belonging to the original version of the individual symbol 710 prior to the insertion of the CP with the extended CP length may be discarded to accommodate the CP with the extended CP length, such as to accommodate the temporary extension of the predetermined CP length.
  • the individual symbol 710 comprising the second data and the CP with the extended CP length may maintain the same predefined symbol duration.
  • the second node 400 can apply the disclosed signal processing by retaining the last L samples in the individual symbol and by applying an L-point FFT.
  • the first node 300 can resume, to the second node 400, transmission of symbols using a configuration signal 712.
  • Each symbol may comprise the first data and the CP having the predetermined CP length.
  • the first node 300 may resume to regular UL transmissions.
  • the first node 300 proceeds to the transmission of regular OFDM symbols.
  • the first node 300 may transmit OFDM symbols comprising a time-domain CP having a predetermined CP length. This corresponds to for example S108 of Fig. 7.
  • Fig. 6 is a signalling diagram 800 illustrating an example communication between an example first node 300 and an example second node 400, for enabling a CP with extended CP length during a downlink transmission where the first node is about to perform a beam switch according to this disclosure.
  • the first node 300 is a wireless device and the second node 400 is a network node.
  • the first node 300 determines the need for performing a beam switch.
  • the first node 300 acting as a wireless device, may perform the beam switch during a downlink, DL, transmission.
  • the first node 300 needs to change a current beam pair to a new beam pair (e.g., due to changes in a channel communication propagation characteristic) that allows for an improved transmission of a symbol by the second node 400 to the first node 300.
  • the first node 300 may be instructed by the second node 400 to perform the beam switching for transmission of the symbol.
  • the second node 400 may need to adapt a predetermined CP length (e.g., a regular CP length available in the numerology) to an extended CP length to mitigate the effect of the beam switching time on the transmission of that particular individual symbol to the first node 300.
  • the second node 400 may need to transmit, to the first node 300, the individual symbol comprising second data (e.g., payload data and/or user data) and a CP with an extended CP length.
  • control signalling may be transmitted by the first node 300 requesting the second node 400 to apply the CP with the extended CP in the individual symbol.
  • the second node 400 transmits, to the first node 300, symbols 801 . Each symbol may have a predefined symbol duration.
  • Each symbol may comprise first data and a cyclic prefix, CP, having a predetermined CP length.
  • CP cyclic prefix
  • each symbol can be seen as an OFDM symbol.
  • the symbols can be seen as OFDM symbols. This corresponds to for example S201 of Fig. 8.
  • the second node 400 receives, from the first node 300, control signalling 806 indicative of a temporary extension of the CP length in one individual symbol having the same predefined symbol duration as any preceding and following symbol.
  • the control signalling 806 can indicate to the second node 400 that an extension of the predetermined CP length is required in one individual symbol, with the one individual symbol having the same predefined symbol duration.
  • the one individual symbol can be seen as an OFDM symbol, where the extension of the predetermined CP length is to be applied.
  • the control signalling 706 can be seen as a request requesting the extension of the predetermined CP length in one or more upcoming OFDM symbols.
  • the first node 300 can request the second node 400 to apply the extension of the predetermined CP length in one or more upcoming OFDM symbols.
  • the temporary extension of the CP length may not modify the predefined symbol duration.
  • the individual symbol may maintain the same predefined symbol duration even when the CP length is temporarily extended. This corresponds to for example S204, S204A of Fig. 8.
  • the second node 400 transmits, to the first node 300, the individual symbol 810 comprising second data and a CP with an extended CP length.
  • the CP with the extended CP length may result from the temporary extension of the predetermined CP length in the one individual symbol having the same predefined symbol duration. This corresponds to for example S206, S206B of Fig. 8.
  • the second node 400 can receive, from the first node 300, capability signalling 802 indicative of a capability of the first node 300 to perform a beam switch.
  • the capability signalling 702 can be indicative of how fast the first node 300 can perform the beam switch (as illustrated e.g., in S202 of Fig. 8).
  • the capability signalling 802 can indicate to the second node 400, such as the network node, that the beam switch is to be applied by the first node 300 (as illustrated e.g., in S202A of Fig. 8).
  • the first node may determine the need for performing the beam switch (as illustrated e.g., in S202AA of Fig. 8).
  • the first node 300 may switch a beam pair used for communication between the first node 300 and the second node 400 across a communication channel (e.g., a wireless link).
  • a communication channel e.g., a wireless link
  • the beam pair selected for communication between the first node 300 and the second node 400 may change as the communication channel propagation conditions change over time (e.g., due to one or more of: blockage, diffraction, scattering, reflections, UE mobility, and any other suitable effects).
  • the first node e.g., a wireless device
  • the second node e.g., a network node
  • the first node 300 may communicate with one or more second nodes 400 using one or more beam pairs, respectively.
  • the first node 300 may be instructed by the one or more second nodes 400 to perform the switching of the corresponding one or more beam pairs.
  • the first node 300 and the second node 400 can communicate to each other second information 804.
  • the second information is indicative of a negotiation of one or more beam switch parameters between the first node 300 and the second node 400 (as illustrated e.g., in S203 of Fig. 8).
  • the second node 400 can transmit, to the first node 300, a request for a change in at least one sample parameter.
  • the at least one sample parameter may be associated with a construction of the CP having the extended CP length.
  • the individual symbol 810 comprising second data and a CP with an extended CP length maintains the same symbol duration, as illustrated in Figs. 3A-3B and Fig. 4.
  • the at least one sample parameter may comprise sample parameters that are applicable to the periodic structure and/or content of the individual symbol.
  • the negotiation of one or more beam switch parameters between the first node 300 and the second node 400 may be performed when the control signalling 806 is transmitted from the first node 300 to the second node 400 (e.g., S204A of Fig.8).
  • the second node as Tx-device transmits a signal according to this disclosure and, may need to be informed via the disclosed control signalling.
  • the first node needs to receive a signal in the manner disclosed herein and may need to be informed).
  • the second node 400 can transmit, to the first node 300, a response 808 accepting the temporary extension of the predetermined CP length.
  • the second node 400 may accept using the temporary extension of the predetermined CP length in the individual symbol 810.
  • the response 808 accepting the temporary extension of the predetermined CP length may be comprised in the control signalling 806.
  • the response 808 accepting the temporary extension of the CP length may be transmitted via a Downlink Control Information, DCL
  • the DCI can signal the application of the CP with the extended CP length in a proper timing, such as at the individual symbol 810, such as at a symbol including the temporary extension of the CP length.
  • the response 808 accepting using the temporary extension of the CP length in the individual symbol 810 can be transmitted, by the second node 400, to one or more first nodes 300, 300A. This corresponds to for example S204C of Fig. 8.
  • the first node 300 can receive, from the second node 400, the individual symbol 810 comprising the second data and the CP with the extended CP length.
  • a disclosed signal processing technique is used by the first node 300 to process the individual symbol 810 comprising second data and a CP with the extended CP length.
  • the disclosed signal processing technique may enable the first node 300 to accurately recover an intended symbol. Put differently, the disclosed signal processing technique may revert the signal processing applied by the first node 300 (as transmitter of the individual symbol).
  • the disclosed signal processing technique may be indicative of a size of a fast Fourier transform, FFT, to apply over the individual symbol comprising solely the second data.
  • the disclosed signal processing technique may indicate an equalization technique (e.g., zero-forcing (ZF) equalizer and/or minimum mean-square error (MMSE)).
  • ZF zero-forcing
  • MMSE minimum mean-square error
  • the CP with the extended CP length may be removed before applying the disclosed signal processing technique.
  • the individual symbol comprising solely the second data may then be processed by the FFT, whose size can be given the size of the individual symbol comprising solely the second data.
  • the intended symbol may result from an equalization of the individual symbol comprising solely the second data processed by the FFT.
  • the individual symbol comprising solely the second data may differ from an original version of the individual symbol prior to the insertion of the CP with the extended CP length.
  • the individual symbol 810 comprising the second data and the CP with the extended CP length is associated with a loss in the data rate.
  • part of the data belonging to the original version of the individual symbol 810 prior to the insertion of the CP with the extended CP length may be discarded to accommodate the CP with the extended CP length, such as to accommodate the temporary extension of the predetermined CP length.
  • the individual symbol 810 comprising the second data and the CP with the extended CP length may maintain the same predefined symbol duration.
  • the second node 400 can resume, to the first node 300, transmission of symbols using a configuration signal 812. Each symbol may comprise the first data and the CP having the predetermined CP length. Put differently, the second node 400 may resume to regular DL transmissions. For example, the second node 400 proceeds to the transmission of regular OFDM symbols. For example, the second node 400 may transmit OFDM symbols comprising a time-domain CP having a predetermined CP length. This corresponds to for example S210 of Fig. 8.
  • Fig. 7 is a flow-chart of an example method 100, performed by a first node, according to the disclosure.
  • the first node is the first node disclosed herein, such as first node 300, 300A of Fig. 1 , Fig. 5-6, 9-12 and Fig 14.
  • the method 100 comprises comprises communicating S101 , between the first node and a second node, using symbols.
  • Each symbol has a predefined symbol duration, such as symbol duration that has been predefined using RRC signalling, and optionally with some variations.
  • Each symbol comprises first data and a cyclic prefix, CP, having a predetermined CP length. This is for example illustrated in Fig. 5-6, 9-12 with 701 , 801 , 901 , 1001 , 2001 , 3001 , respectively.
  • the first node is a wireless device
  • the second node is a network node.
  • the first node is a first wireless device
  • the second node is a second wireless device.
  • Each symbol may be seen as a first OFDM symbol, such as a symbol comprising a plurality of subcarriers.
  • the symbol can be expressed in time units.
  • the plurality of subcarriers may carry the first data and the CP having the predetermined CP length.
  • the first OFDM symbol can be generated by taking an Inverse Fast Fourier Transformed, IFFT, over a first frequency domain symbol followed by the insertion of the CP having the predetermined CP length.
  • the CP having the predetermined CP length is a time-domain cyclic prefix, CP.
  • the CP is a prefix.
  • the first OFDM symbol is prefixed with a predetermined CP of the same first OFDM symbol, in which the tail of the first OFDM symbol is copied to the beginning of the same first OFDM symbol.
  • the predetermined CP does not have to be a tailcopy of the useful part of the OFDM symbol.
  • the CP predetermined does not need to be generated from user data and/or payload data.
  • the first frequency domain symbol can be seen as a set of information symbols and/or data symbols and/or modulation symbols. Stated differently, the first frequency domain symbol can be seen as a set of complex values representing a mapped constellation point and therefore specifying both an amplitude and a phase of a sinusoid for a subcarrier.
  • the first OFDM symbol can be seen as a first node specific symbol, such as a user specific symbol, such as a wireless device specific symbol. In one or more examples, the first OFDM symbol can be seen as a second node specific symbol, such as a network node specific symbol. In one or more examples, the first OFDM symbol can be seen as a first node specific symbol, such as a user specific symbol, such as a first wireless device specific symbol, e.g. in a sidelink communication. In one or more examples, the first OFDM symbol can be seen as a second node specific symbol, such as a user specific symbol, such as a second wireless device specific symbol.
  • the method 100 comprises communicating S104, between the first node and the second node, control signalling indicative of a temporary extension of CP length in one individual symbol having the same predefined symbol duration.
  • the individual symbol has the same predefined symbol duration as any preceding and following symbol (such as each symbols communicated S101 ).
  • the temporary extension is temporary or occasional is that the extension only applies to the one individual symbol, such as the upcoming individual symbol that accommodates the beam swich.
  • the extension can be seen as an extension that is triggered by a beam switch and that has lasts for only the one individual symbol.
  • the OFDM structure is the same before and after the temporary extension of the CP. In other words, the OFDM structure is the same as the one used before the extended CP.
  • the temporary extension of CP length in the one individual symbol having the same predefined symbol duration is associated with a temporary change in a ratio between the extended CP length and a length of the second data.
  • the control signalling may be as control signalling 706, 806, 906, 1006, 2006, 3006 illustrated in Figs. 5-6, 9-12, respectively.
  • the control signalling indicative of a temporary extension of CP length in one individual symbol having the same predefined symbol duration can be in form of a flag and/or one or more control messages.
  • the flag may be seen as an implicit signalling indicating to the second node that, a temporary extension of CP length is used in one individual symbol, with the one individual symbol having the same predefined symbol duration.
  • the one or more control messages can be indicating to the second node that a temporary extension of CP length is used in one individual symbol, with the one individual symbol having the same predefined symbol duration.
  • the one or more control messages can include an information indicating to the second node that, a temporary extension of CP length is used in one individual symbol, with the one individual symbol having the same predefined symbol duration.
  • the control signalling indicative of a temporary extension of CP length in one individual symbol having the same predefined symbol duration can be in form of DCL
  • control signalling may indicate to the second node that an extension of the CP length is to be applied in one individual symbol, wherein the one individual symbol has the same predefined symbol duration.
  • the one individual symbol can be seen as an OFDM symbol, where the extension of the CP length is to be applied.
  • the OFDM symbol may be seen as an upcoming OFDM symbol, such as an OFDM symbol to be communicated between the first node and the second node.
  • the control signalling can be seen as an indication to the second node that an upcoming OFDM symbol comprising the temporary extension of CP length is to be communicated between the first node and the second node.
  • the first node may indicate to the second node that the temporary extension of the predetermined CP length is used in the upcoming OFDM symbol.
  • the first node may indicate to the second node that the temporary extension of the predetermined CP length is used in one or more upcoming OFDM symbols.
  • the indication to the second node that an upcoming OFDM symbol comprising the temporary extension of CP length is to be communicated between the first node and the second node applies when the first node acting as a wireless device switches beams during an UL transmission (e.g., in Fig. 5).
  • the control signalling can be seen as a request requesting the extension of the predetermined CP length in one or more upcoming OFDM symbols.
  • the first node can request the second node to apply the extension of the predetermined CP length in one or more upcoming OFDM symbols.
  • the temporary extension of the CP length may not modify the predefined symbol duration.
  • the request requesting the extension of the predetermined CP length in one or more upcoming OFDM symbols can be used when the first node acting as a wireless device switches beams during a DL transmission (e.g., in Fig. 6).
  • the individual symbol may maintain the same predefined symbol duration as any other symbol even when the CP length is temporarily extended.
  • the temporary extension can be seen as a temporary extension of a regular CP and/or of an extended CP and/or of any other suitable CP type, such as presented in a numerology, which refers to a configuration of waveform parameters.
  • the method 100 comprises communicating S106 the individual symbol comprising second data and a CP with an extended CP length.
  • the amount of second data may be smaller than the amount of first data. This is for examples illustrated in Fig. 5-6, 9-12 with the individual symbol comprising second data and a CP with an extended CP length 710, 810, 908, 1008, 2010, 3010.
  • the individual symbol comprising the second data and the CP with the extended CP length can be seen as a second OFDM symbol.
  • the second OFDM symbol may comprise a plurality of subcarriers.
  • the plurality of subcarriers may carry the second data and the CP with the extended CP length.
  • the second OFDM symbol may be generated by taking the IFFT over a second frequency domain symbol followed by the insertion of the CP with the extended CP length.
  • the second frequency domain symbol can be seen as a set of information symbols and/or data symbols and/or modulation symbols. Stated differently, the frequency domain symbol can be seen as a set of complex values representing the mapped constellation point and therefore specifying both an amplitude and a phase of a sinusoid for a subcarrier.
  • the second OFDM symbol can be seen as a first node specific symbol, such as a user specific symbol, such as a wireless device specific symbol. In one or more examples, the second OFDM symbol can be seen as a second node specific symbol, such as a network node specific symbol. In one or more examples, the second OFDM symbol can be seen as a first node specific symbol, such as a user specific symbol, such as a first wireless device specific symbol. In one or more examples, the second OFDM symbol can be seen as a second node specific symbol, such as a user specific symbol, such as a second wireless device specific symbol.
  • the control signalling comprises first information indicating how to process the communicated individual symbol including the CP with the extended CP length. In one or more examples, the control signalling comprises the first information. In one or more examples, the first information indicates how to process the communicated individual symbol including the CP with the extended CP length. In other words, the first information may be indicative of how the communicated individual symbol should be handled. For example, when the first node transmits, to the second node, the control signalling, the first information may inform the second node on how to process the communicated individual symbol. For example, when the second node transmits, to the first node, the control signalling, the first information may inform the first node on how to process the communicated individual symbol.
  • the first information may be indicative of a predetermined rule or parameters for processing the individual symbol having a CP with extended length.
  • processing the communicated individual symbol can be seen as inspecting which part of the communicated individual symbol comprises the second data.
  • processing the communicated individual symbol can be seen as inspecting which part of the communicated individual symbol comprises the CP with the extended CP length.
  • the first information may indicate which part of the communicated individual symbol comprises the second data (e.g., the information symbols and/or the payload data) and the CP with the extended CP length.
  • the control signalling is indicative of the extended CP length and/or of a length of the second data.
  • control signal indicates the extended CP length and/or the length of the second data.
  • providing information about the extended CP length and/or the length of the second data may enable the processing of the communicated individual symbol comprising the CP with the extended CP length.
  • control signalling is indicative of construction of the CP having the extended CP length. In one or more examples, the control signalling indicates how the CP having the extended CP length is constructed. In one or more example methods, the construction is based on at least a part of the second data.
  • the temporary extension of the CP length is associated with a change in the construction of the individual symbol.
  • the individual symbol comprises the second data and the CP with the extended CP length.
  • the construction of the CP having the extended CP length is based on a proper designing of the individual symbol intended to be communicated.
  • the communicated individual symbol comprising second data and a CP with an extended CP length maintains the same symbol duration, as illustrated in Figs. 3A-3B, and in Fig. 4.
  • the CP having the extended CP length maintaining the symbol duration may be generated applying a mathematical formula based on the second data, such as the payload data.
  • the CP having the extended CP length can be inserted in from a predetermined CP.
  • the extended CP length is associated with a time required for the first node to perform a beam switch.
  • the first node may switch a beam pair used for communication between the first node and the second node across a communication channel.
  • the beam pair selected for communication between the first node and the second node may change as the communication channel propagation conditions change over time (e.g., due to one or more of: blockage, diffraction, scattering, reflections, UE mobility, and any other suitable effects).
  • the capability signalling can indicate to the second node that the beam switch is to be applied by the first node.
  • the first node e.g., a wireless device
  • the second node e.g., a network node
  • the first node may communicate with one or more second nodes using one or more beam pairs, respectively.
  • the first node may be instructed by the one or more second nodes to perform the switching of the corresponding one or more beam pairs.
  • the CP having the extended CP length comprises the CP having the predetermined CP length and an additional CP.
  • the CP having the extended CP length is a time-domain cyclic prefix, CP.
  • the CP having the extended CP length comprises the predetermined CP and an additional CP.
  • the additional CP may be generated and/or constructed based on the structure of the individual symbol, as illustrated by Figs. 3A-4. The insertion of the CP having the extended CP length does not violate the symbol duration. In other words, the insertion of the CP having the extended length only affects the content of the individual symbol.
  • the additional CP can be seen as a prefix.
  • the individual symbol may be associated with a symbol duration.
  • the individual symbol is for example constructed so that the second node (when acting as a receiver, such as in an UL transmission) and/or the first node (when acting as a receiver such as in a DL transmission) are capable of accurately recovering the original version of the individual symbol prior to the insertion of the CP with the extended CP length.
  • the construction of the CP having the extended CP length based on the structure of the individual symbol generates and/or creates diversity in the time domain, such as a replication of the samples comprising the second data, such as the replication of the second data throughout the bandwidth e.g. by having data distributed across the bandwidth.
  • the additional CP of the individual symbol is generated by manipulating the second data, such as by manipulating the individual symbol intended to be transmitted.
  • the additional CP of the individual symbol is generated using at least a part of the second data (as illustrated by 606B and 606D of Fig. 4).
  • the individual symbol, such as the second OFDM symbol is prefixed with the predetermined CP (such as 606A of Fig. 4) by appending a copy of a first part (such as 606C of Fig. 4) of a tail of the same second OFDM symbol.
  • the predetermined CP has a first periodicity as illustrated by 602A, 606A, 604A of Fig. 4.
  • the first periodicity is associated with the predetermined CP.
  • the individual symbol is prefixed with the additional CP (such as 606B of Fig. 4) by appending a copy of a second part (such as 606D of Fig. 4) of a tail of the same second OFDM symbol.
  • the second part is different from the first part.
  • the additional CP is for example aperiodic and valid for this individual symbol (such as symbol 606 of Fig. 4).
  • the individual symbol may be prefixed with the additional CP in addition to the predetermined CP.
  • the length of the additional CP depends on the quantity of second data that can be sacrificed. Put differently, the same predefined symbol duration is maintained with the insertion of the additional CP, such as the same symbol duration of the symbol comprising the predetermined CP length.
  • the additional CP having a length may affect the quantity of second data to be included in the individual symbol, such as the same quantity of second data. In other words, there may be a trade-off and/or a commitment between the length of the additional CP and the quantity of second data to discard for accommodating the additional CP.
  • communicating S104 between the first node and the second node, the control signalling indicative of the temporary extension of the CP length comprises transmitting S104A, to the second node, the control signalling indicative of the temporary extension of the CP length.
  • the control signalling indicative of the temporary extension of the CP length is transmitted from the first node (such as a wireless device and/or a first wireless device respectively) to the second node (such as a network node and/or a second wireless device respectively) so that the first node can use the CP having the extended CP length in its communication with the second node, such as in UL communication and/or in sidelink communication. This is for example used when the wireless device requests a CP with extended CP length.
  • communicating S106 the individual symbol comprising the second data and the CP with extended CP length comprises transmitting S106A, to the second node, the individual symbol comprising the second data and the CP with the extended CP length.
  • the individual symbol comprising the second data and the CP with the extended CP length is the individual symbol 710, 908, 2010 of Figs. 5, 9 and 11 , respectively.
  • the first node is the wireless device while the second node is the network node.
  • the first node is the first wireless device while the second node is the second wireless device.
  • the first node transmits, to the second node, the individual symbol comprising the second data and the CP with the extended CP length (e.g., an UL transmission and/or a sidelink, SL, transmission).
  • control signalling can be seen as an indication to the second node that the one individual symbol comprising the temporary extension of the CP length, such as an extension of a predetermined CP (such as a regular CP and/or an extended CP and/or any other suitable CP type) is to be transmitted to the second node.
  • the one individual symbol may be seen as an upcoming OFDM signal.
  • the first node indicates to the second node that the temporary extension of the CP length is used in the upcoming OFDM symbol.
  • the control signalling is for example the control signalling 706, 2006 of Figs. 5 and 11 , respectively.
  • the indication to the second node that the temporary extension of the CP length is used in the upcoming OFDM symbol applies when the first node acting as a wireless device switches beams during an UL transmission (e.g., in Fig. 5).
  • the indication to the second node that the temporary extension of the CP length is used in the upcoming OFDM symbol applies when the first node acting as a first wireless device switches a transmit beam during a SL transmission (e.g., in Fig. 11 ).
  • communicating S106 the individual symbol comprising the second data and the CP with extended CP length comprises receiving S106B, from the second node, the individual symbol comprising the second data and the CP with the extended CP length.
  • the individual symbol comprising the second data and the CP with the extended CP length is the individual symbol 810, 3010 of Fig. 6 and 12, respectively.
  • the first node is the wireless device while the second node is the network node.
  • the first node is the first wireless device while the second node is the second wireless device.
  • the first node receives, from the second node, the individual symbol comprising the second data and the CP with the extended CP length (e.g., a DL transmission and/or a SL transmission).
  • the control signalling can be seen as a request requesting the extension of the CP length, such as an extension of the predetermined CP (e.g., a regular CP and/or an extended CP and/or any other suitable CP type) in the one individual symbol to be transmitted by the second node.
  • the one individual symbol may be seen as an upcoming OFDM signal.
  • the first node can request the second node to apply the extension of the predetermined CP length in the upcoming OFDM symbols.
  • the control signalling is the control signalling 806, 3006 of Figs. 6 and 12, respectively.
  • the request to the second node to apply the extension of the predetermined CP length in the upcoming OFDM symbols can be used when the first node acting as a wireless device switches beams during a DL transmission (e.g. in Fig. 6).
  • the request to the second node to apply the extension of the predetermined CP length in the upcoming OFDM symbols applies when the first node acting as a first wireless device switches a receive beam during a SL transmission (e.g., in Fig. 12).
  • communicating S104, between the first node and the second node, the control signalling indicative of the temporary extension of the CP length comprises receiving S104B from the second node, the control signalling indicative of the temporary extension of the CP length.
  • the control signalling indicative of the temporary extension of the CP length may be received by the first node.
  • the second node may transmit, to the first node, control signalling indicative of the temporary extension of the CP length.
  • the control signalling indicative of the temporary extension of the CP length may be in form of Downlink Control Indicator, DCL
  • the DCI can signal the application of the CP with the extended CP length in a proper timing, such as at the individual symbol, such as at a symbol including the temporary extension of the CP length.
  • the second node may accept the reception of the temporary extension of the CP length. In other words, the second node may accept the reception of the individual symbol comprising second data and a CP with the extended CP length.
  • communicating S106 the individual symbol comprising the second data and the CP with extended CP length comprises transmitting S106A, to the second node, the individual symbol comprising the second data and the CP with the extended CP length.
  • the first node transmits, to the second node, the individual symbol comprising the second data and the CP with the extended CP length.
  • the individual symbol comprising the second data and the CP with the extended CP length is the individual symbol 908 of Fig. 9.
  • control signalling can be seen as an announcement, from the second node, announcing the need to use the extension of the CP length, such as an extension of the predetermined CP (e.g., a regular CP and/or an extended CP and/or any other suitable CP type) in the one individual symbol to be transmitted by the first node.
  • the one individual symbol may be seen as an upcoming OFDM signal.
  • the control signalling is the control signalling 906 of Fig. 9.
  • communicating S106 the individual symbol comprising the second data and the CP with extended CP length comprises receiving S106B, from the second node, the individual symbol comprising the second data and the CP with the extended CP length.
  • the first node receives, from the second node, the individual symbol comprising the second data and the CP with the extended CP length.
  • the individual symbol comprising the second data and the CP with the extended CP length is the individual symbol 1008 of Fig. 10.
  • the control signalling can comprise an announcement announcing the extension of the CP length, such as an extension of the predetermined CP (e.g., a regular CP and/or an extended CP and/or any other suitable CP type) in the one individual symbol to be transmitted by the second node.
  • the one individual symbol may be seen as an upcoming OFDM signal.
  • the second node announces the use of the temporary extension of the predetermined CP length in the upcoming OFDM symbols.
  • the control signalling is the control signalling 1006 of Fig. 10.
  • the announcement, from the second node, announcing the extension of the CP length in the one individual symbol to be transmitted by the second node to the first node applies when the second node acting as a network node switches beams during an DL transmission (e.g., in Fig. 10).
  • control signalling indicative of the temporary extension of the CP length comprises a request requesting the extended CP length.
  • the first node can request the second node to apply the extension of the predetermined CP length in the upcoming OFDM symbol, such as the individual symbol.
  • the first node indicates to the second node that the temporary extension of the CP length is used in the upcoming OFDM symbol.
  • control signalling indicative of the temporary extension of the CP length comprises an announcement announcing the extended CP length.
  • the announcement announcing the extended CP length may be transmitted via a Downlink Control Information, DCL
  • the DCI can signal the application of the CP with the extended CP length in a proper timing, such as at the individual symbol, such as at a symbol including the temporary extension of the CP length.
  • the announcement announcing the extended CP length can be transmitted, by the second node, to one or more first nodes.
  • the request comprises an extension time parameter.
  • the extension time parameter indicates the time required to perform a beam switch.
  • the extension time parameter may be expressed in time units.
  • the first node performs a switching of a beam pair used for communication between the first node and the second node across a communication channel.
  • the beam pair selected for communication between the first node and the second node may be changed by the first node as the communication channel propagation conditions change over time (e.g., due to one or more of: blockage, diffraction, scattering, reflections, UE mobility, and any other suitable effects).
  • the first node e.g., a wireless device
  • the second node e.g., a network node
  • the first node may communicate with one or more second nodes using one or more beam pairs, respectively.
  • the first node may be instructed by the one or more second nodes to perform the switching of the corresponding one or more beam pairs.
  • communicating S104 between the first node and the second node, the control signalling indicative of the temporary extension of the CP length comprises receiving S104C, from the second node, a response accepting the temporary extension of the CP length.
  • the response accepting the temporary extension of the CP length is transmitted via a Downlink Control Information, DCL
  • the DCI can signal the application of the CP with the extended CP length in a proper timing, such as at the individual symbol, such as at a symbol including the temporary extension of the CP length.
  • the second node may accept the reception of the temporary extension of the CP length. In other words, the second node may accept the reception of the individual symbol comprising second data and a CP with the extended CP length.
  • the response accepting the temporary extension of the CP length is for example the response 708, 808, 2008, 3008 illustrated in Figs. 5-6, 11-12, respectively.
  • the method comprises transmitting S102, to the second node, a capability signalling indicative of a capability of the first node to perform the beam switch.
  • the capability signalling indicates, to the second node, whether the first node can perform the beam switch.
  • a wireless device and/or a first wireless device acting as a first node can transmit a capability signalling to a network node or to a second wireless device, respectively, indicating that the wireless device and/or the first wireless device can perform the beam switching. This is an optional step that can be performed before the communication S104 between the first node and the second node, the control signalling indicative of the temporary extension of the CP length.
  • transmitting S102, to the second node, the capability signalling indicative of the capability of the first node to perform the beam switch comprises transmitting S102A, to the second node, information indicating that the beam switch is to be applied by the first node.
  • the capability signalling can indicate to the second node that the beam switch is to be applied by the first node.
  • transmitting S102A, to the second node, information indicating that the beam switch is to be applied by the first node comprises determining S102AA the need for performing the beam switch.
  • the capability signalling transmitted to the second node may comprise information associated with the determination for performing the beam switch.
  • the first node determines the need for performing the beam switch and includes such information in the capability signalling sent to the second node.
  • the capability signalling is for example the capability signalling 702, 802, 902, 1002, 2002, 3002 illustrated in Figs. 5-6, 9-12, respectively.
  • the first node e.g., a wireless device or a first wireless device or a second wireless device
  • performing the beam switching in a SL and/or UL transmission can be seen as switching a transmit beam.
  • the control signalling may be seen as an indication to the second node that the one individual symbol comprising the temporary extension of the CP length, such as an extension of the predetermined CP, is to be transmitted to the second node.
  • the control signalling is the control signalling 706, 2006 of Figs. 5 and 11 , respectively.
  • the indication to the second node that the temporary extension of the CP length is used in the upcoming OFDM symbol applies when the first node acting as a wireless device switches beams during a UL transmission (e.g., in Fig. 5).
  • the indication to the second node that the temporary extension of the CP length is used in the upcoming OFDM symbol applies when the first node acting as a first wireless device switches a transmit beam during a SL transmission (e.g., in Fig. 11).
  • the first node e.g., a wireless device or a first wireless device or a second wireless device
  • performing the beam switching in a DL and/or SL transmission can be seen as switching a receive beam.
  • the control signalling may be seen as a request requesting the extension of the CP length, such as an extension of the predetermined CP, in the one individual symbol to be transmitted by the second node.
  • the control signalling is the control signalling 806, 3006 of Figs. 6 and 12, respectively.
  • the request to the second node to apply the extension of the predetermined CP length in the upcoming OFDM symbols can be used when the first node acting as a wireless device switches beams during a DL transmission (e.g., in Fig. 6).
  • the request to the second node to apply the extension of the predetermined CP length in the upcoming OFDM symbols applies when the first node acting as a first wireless device switches a receive beam during a SL transmission (e.g., in Fig. 12).
  • the first node (acting as e.g., a network node) performs the beam switching during UL transmissions.
  • the control signalling can be seen as an announcement, to the second node, requiring the use of the extension of the CP length, such as an extension of the predetermined CP, in the one individual symbol to be transmitted by the second node (acting as e.g., a wireless device).
  • the control signalling is the control signalling 906 of Fig. 9.
  • the individual symbol is the individual symbol 908 of Fig. 9.
  • the first node (acting as e.g., a network node) performs the beam switching during DL transmissions.
  • the control signalling can be seen as an announcement, to the second node (acting as e.g., a wireless device), announcing the use of the extension of the CP length, such as an extension of the predetermined CP, in the one individual symbol to be transmitted by the first node.
  • the control signalling is the control signalling 1006 of Fig. 10.
  • the control signalling is the control signalling 906 of Fig. 9.
  • the individual symbol is the individual symbol 1008 of Fig. 10.
  • the method comprises communicating S103, between the first node and the second node, second information indicative of a negotiation of one or more beam switch parameters between the first node and the second node.
  • the second information is for example the second information 704, 804, 904, 1004, 2004, 3004 illustrated in Figs. 5-6, 9-12, respectively.
  • the negotiation of one or more beam switch parameters between the first node and the second node may be performed before or when the control signalling is communicated between the first node and the second node (such as together with the control signalling).
  • the beam switch parameters include a period of the periodic structure of the subcarrier allocation (such as K as the receiver needs only to accurately receive N/K samples, where N denotes the total number of subcarriers; such as K' ; such as L samples for additional CP, and/or such as B numbers of subcarriers allocated to the first node).
  • K' denotes the number of periods of the periodic waveform being transmitted that are part of the additional CP.
  • the sample parameter can provide some additional flexibility, on top of determining the length of the additional CP.
  • communicating S103 between the first node and the second node, the second information indicative of the negotiation comprises transmitting S103A, to the second node, a request for a change in at least one sample parameter.
  • the at least one sample parameter is associated with the construction of the CP having the extended CP length.
  • the at least one sample parameter may be expressed as N/K samples when only every /Cth subcarrier is used, the corresponding time-domain signal has K periods and the receiver needs only to accurately receive N/K samples.
  • the individual symbol comprising the second data and the CP with the extended CP length maintains the same symbol duration, as illustrated in Figs. 3A-3B and in Fig. 4 as well as the periodic structure of the subcarrier allocation as illustrated in Fig. 3A.
  • the at least one sample parameter may comprise sample parameters that are applicable to the periodic structure and/or the content of the individual symbol.
  • communicating S103, between the first node and the second node, the second information indicative of the negotiation comprises receiving S103B, from the second node, a response indicative of a change in the power associated with the second data after performing the beam switch.
  • the change in the power associated with the second data may be applied, by the first node, after performing the beam switch.
  • the first node may require acquiring information on whether the second data (e.g., data samples) transmitted after performing the beam switch can be boosted in power.
  • the second information can be provided in a request from the first to the second node.
  • the method comprises resuming S108 transmission of symbols to the second node.
  • each symbol comprises the first data and the CP having the predetermined CP length.
  • the first node can resume the transmission of symbols to the second node.
  • the first node may resume to UL transmissions.
  • the first node proceeds to the transmission of regular OFDM symbols (e.g., comprising a CP having the predetermined CP length). This corresponds to for example 712, 910, 3012 of Figs. 5, 9 and 12, respectively.
  • the method comprises resuming S110 reception of symbols from the second node.
  • each symbol comprises the first data and the CP having the predetermined CP length.
  • the second node can resume the transmissions of symbols with predetermined CP lengths to the first node.
  • the second node may resume to DL transmissions.
  • the second node proceeds to the transmission of regular OFDM symbols (e.g., comprising a CP having the predetermined CP length). This corresponds to for example 812, 1010, 2012 of Figs. 6, 10 and 11 , respectively.
  • Fig. 8 is a flow-chart of an example method 200, performed by a second node according to the disclosure.
  • the second node is the second node disclosed herein, such as second node 400 of Fig. 1 , Figs. 5-6, Figs. 9-12, and Fig 13.
  • the method 200 comprises communicating S201 , between a first node and the second node, using symbols.
  • Each symbol has a predefined symbol duration.
  • Each symbol comprises first data and a cyclic prefix, CP, having a predetermined CP length.
  • the first node is a wireless device
  • the second node is a network node.
  • the first node is a first wireless device
  • the second node is a second wireless device.
  • the method 200 comprises communicating S204, between the first node and the second node, control signalling indicative of a temporary extension of the CP length in one individual symbol having the same predefined symbol duration.
  • the method 200 comprises communicating S206 the individual symbol comprising second data and a CP with an extended CP length.
  • control signalling comprises first information indicating how to process the communicated individual symbol including the CP with the extended CP length.
  • control signalling is indicative of the extended CP length and/or of a length of the second data.
  • control signalling is indicative of construction of the CP having the extended CP length.
  • the construction is based on at least a part of the second data.
  • the extended CP length is associated with a time required for the first node to perform a beam switch.
  • the CP having the extended CP length comprises the CP having the predetermined CP length and an additional CP.
  • communicating S204, between the first node and the second node, the control signalling indicative of the temporary extension of the CP length comprises receiving S204A, from the first node, the control signalling indicative of the temporary extension of the CP length.
  • the second node receives the control signalling transmitted in S104A of Fig. 7.
  • communicating S204, between the first node and the second node, the control signalling indicative of the temporary extension of the CP length comprises transmitting S204B, to the first node, the control signalling indicative of the temporary extension of the CP length.
  • the second node transmits the control signalling received in S104B of Fig. 7.
  • control signalling indicative of the temporary extension of the CP length comprises a request requesting the extended CP length.
  • the request comprises an extension time parameter.
  • communicating S204, between the first node and the second node, the control signalling indicative of the temporary extension of the CP length comprises transmitting S204C, to the first node, a response accepting the temporary extension of the CP length.
  • the second node transmits the response accepting the temporary extension of the CP length received in S104C of Fig. 7.
  • the method comprises receiving S202, from the first node, capability signalling indicative of a capability of the first node to perform the beam switch.
  • the second node receives the capability signalling transmitted in S102 of Fig. 7.
  • receiving S202, from the first node, the capability signalling indicative of the capability of the first node to perform the beam switch comprises receiving S202A, from the first node, information indicating that the beam switch is to be applied by the first node.
  • the second node receives the information indicating that the beam switch is to be applied by the first node transmitted in S102A of Fig. 7.
  • the method comprises determining S202AA the need for performing the beam switch.
  • the second node determines the need for performing the beam switch.
  • the second node may transmit, to the first node, information associated with a new beam pair.
  • the individual symbol comprising the second data and the extended CP is communicated using the new beam pair.
  • the method comprises communicating S203, between the first node and the second node, second information indicative of a negotiation of one or more beam switch parameters between the first node and the second node.
  • the method comprises communicating S203, between the first node and the second node, the second information indicative of the negotiation comprises receiving S203A, from the first node, a request for a change in at least one sample parameter. For example, the second node receives the request for a change in at least one sample parameter transmitted in S103A of Fig 7.
  • the at least one sample parameter is associated with the construction of the CP having the extended CP length.
  • the second node determines the need for performing the beam switch. In one or more examples, the second node performs the beam switch. In one or more examples, the second node may not need to transmit, to the first node, the request for the change in at least one sample parameter.
  • the disclosed techniques address, inter alia, an inability of the first node to receive, from the second node, a first part of a symbol, namely the predetermined CP and a beginning part of the symbol.
  • the first node receives the one individual symbol with the CP with the extended CP length.
  • the duration of the CP with the extended CP length allows the first node to mitigate a signal loss during the beam switching, such as a time duration needed to perform the beam switching.
  • the CP with the extended CP length comprised in the one individual symbol is generated to be longer than the delay spread of the communication channel.
  • communicating S203, between the first node and the second node, the second information indicative of the negotiation comprises transmitting S203B, to the first node, a response indicative of a change in the power associated with the second data after performing the beam switch.
  • the second node transmits the response indicative of a change in the power received in S103B of Fig. 7.
  • communicating S206 the individual symbol comprising the second data and the CP with extended CP length comprises receiving S206A, from the first node, the individual symbol comprising the second data and the CP with the extended CP length.
  • the second node receives the individual symbol transmitted in S106A of Fig. 7.
  • communicating S206 the individual symbol comprising the second data and the CP with extended CP length comprises transmitting S206B, to the first node, the individual symbol comprising the second data and the CP with the extended CP length.
  • the second node transmits the individual symbol received in S106B of Fig. 7.
  • the method comprises resuming S208 reception of symbols, from the first node.
  • each symbol comprises the first data and the CP having the predetermined CP length. This may correspond to S108 of Fig. 7.
  • the method comprises resuming S210 transmission of symbols, to the first node.
  • each symbol comprises the first data and the CP having the predetermined CP length. This may correspond to S110 of Fig. 7.
  • Fig. 9 is a signalling diagram 900 illustrating an example communication between an example first node 300 and an example second node 400, for enabling a CP with extended CP length during an uplink transmission where the second node is about to perform a beam switch according to this disclosure.
  • the first node 300 is a wireless device and the second node 400 is a network node.
  • the second node 400 determines the need for performing a beam switch.
  • the second node 400 acting as a network node, may perform the beam switch during an UL transmission.
  • the second node 400 needs to change a current beam pair to a new beam pair (e.g., due to changes in a channel communication propagation characteristic) that allows for an improved transmission of a symbol from the first node 300 to the second node 400.
  • the first node 300 may be instructed by the second node 400 to not perform the beam switch for transmission of the symbol.
  • the first node 300 may need to adapt a predetermined CP length (e.g., a regular CP length available in the numerology) to an extended CP length to mitigate the effect of the beam switching time on the transmission of that particular individual symbol to the second node 400.
  • the first node 300 may need to transmit, to the second node 400, the individual symbol comprising second data (e.g., payload data, and/or user data) and a CP with an extended CP length.
  • control signalling may be transmitted by the second node 400 announcing the first node 300 to use the CP with the extended CP in the individual symbol to be transmitted by the first node 300 to the second node 400.
  • the first node 300 transmits, to the second node 400, symbols 901 .
  • Each symbol may have a predefined symbol duration.
  • Each symbol may comprise first data and a cyclic prefix, CP, having a predetermined CP length.
  • CP cyclic prefix
  • each symbol can be seen as an OFDM symbol.
  • the symbols can be seen as OFDM symbols.
  • the second node 400 transmits, to the first node 300, control signalling 906 indicative of a temporary extension of CP length in one individual symbol having the same predefined symbol duration as any preceding and following symbol.
  • the first node 300 transmits, to the second node 400, the one individual symbol 908 comprising second data and a CP with an extended CP length.
  • the CP with the extended CP length may result from the temporary extension of the predetermined CP length in the one individual symbol having the same predefined symbol duration.
  • the control signalling 906 can be seen as an announcement, to the first node, requiring the use of the extension of the CP length, such as an extension of the predetermined CP, in the one individual symbol to be transmitted by the first node 300.
  • control signalling indicative of the temporary extension of the CP length may be in form of Downlink Control Indicator, DCL
  • the DCI can signal the application of the CP with the extended CP length in a proper timing, such as at the individual symbol, such as at a symbol including the temporary extension of the CP length.
  • the first node 300 can transmit, to the second node 400, capability signalling 702 indicative of a capability of the first node 300 to perform a beam switch.
  • the second node 400 may determine that the second node 400 is to perform the beam switch, thereby informing the first node 300 that the first node 300 is not to perform the beam switch. For example, the second node 400 may perform a switching of a beam pair used for communication between the first node 300 and the second node 400 across a communication channel (e.g. a wireless link).
  • a communication channel e.g. a wireless link
  • the first node 300 and the second node 400 can communicate to each other second information 904.
  • the second information may be indicative of a negotiation of one or more beam switch parameters between the first node 300 and the second node 400, as illustrated by S103 and S203 in Figs. 7-8.
  • the second node 400 can receive, from the first node 300, the individual symbol 908 comprising the second data and the CP with the extended CP length.
  • a disclosed signal processing technique is used by the second node 400 to process the individual symbol 908 comprising second data and a CP with the extended CP length.
  • the disclosed signal processing technique may enable the second node 400 to accurately recover an intended symbol.
  • the disclosed signal processing technique can be seen as an equalization technique.
  • the intended symbol may result from an equalization of the individual symbol comprising solely the second data.
  • the CP with the extended CP length may be removed before applying the disclosed signal processing technique.
  • the first node 300 can resume, to the second node 400, transmission of symbols using a configuration signal 910.
  • Each symbol may comprise the first data and the CP having the predetermined CP length.
  • Fig. 10 is a signalling diagram 1000 illustrating an example communication between an example first node 300 and an example second node 400, for enabling a CP with extended CP length during a downlink transmission where the second node is about to perform a beam switch according to this disclosure.
  • the first node 300 is a wireless device and the second node 400 is a network node.
  • the second node 400 determines the need for performing a beam switch.
  • the second node 400 acting as a network node, may perform the beam switch during a DL transmission.
  • the second node 400 needs to change a current beam pair to a new beam pair (e.g., due to changes in a channel communication propagation characteristic) that allows for an improved transmission of a symbol from the first node 300 to the second node 400.
  • the second node 400 may instruct the first node 300 to not perform the beam switch for transmission of the symbol.
  • the second node 400 may need to adapt a predetermined CP length (e.g., a regular CP length available in the numerology) to an extended CP length to mitigate the effect of the beam switching time on the transmission of that particular individual symbol to the first node 300.
  • the second node 400 may need to transmit, to the first node 300, the individual symbol comprising second data (e.g., payload data, and/or user data) and a CP with an extended CP length.
  • control signalling may be transmitted by the second node 400 announcing to the first node 300 the use of the CP with the extended CP in the individual symbol to be transmitted by the second node 400 to the first node 300.
  • the second node 400 transmits, to the first node 300, symbols 1001.
  • Each symbol may have a predefined symbol duration.
  • Each symbol may comprise first data and a cyclic prefix, CP, having a predetermined CP length.
  • CP cyclic prefix
  • each symbol can be seen as an OFDM symbol.
  • the symbols can be seen as OFDM symbols.
  • the second node 400 transmits, to the first node 300, control signalling 1006 indicative of a temporary extension of CP length in one individual symbol having the same predefined symbol duration as any preceding and following symbol.
  • the second node 400 transmits, to the first node 300, the individual symbol 1008 comprising second data and a CP with an extended CP length.
  • the CP with the extended CP length may result from the temporary extension of the predetermined CP length in the one individual symbol having the same predefined symbol duration.
  • the control signalling 1006 can comprise an announcement announcing the extension of the CP length, such as an extension of the predetermined CP in the one individual symbol to be transmitted by the second node 400.
  • control signalling indicative of the temporary extension of the CP length may be in form of Downlink Control Indicator, DCI.
  • DCI can signal the application of the CP with the extended CP length in a proper timing, such as at the individual symbol, such as at a symbol including the temporary extension of the CP length.
  • the first node 300 can transmit, to the second node 400, capability signalling 1002 indicative of a capability of the first node 300 to perform a beam switch.
  • the second node 400 may determine that the second node 400 is to perform the beam switch, thereby informing the first node 300 that the first node 300 is not to perform the beam switch. For example, the second node 400 may perform a switching of a beam pair used for communication between the first node 300 and the second node 400 across a communication channel (e.g. a wireless link).
  • a communication channel e.g. a wireless link
  • the first node 300 and the second node 400 can communicate to each other second information 1004.
  • the second information may be indicative of a negotiation of one or more beam switch parameters between the first node 300 and the second node 400, as illustrated by S103 and S203 in Figs. 7-8.
  • the second node 400 transmits, to the first node 300, the individual symbol 1008 comprising second data and a CP with an extended CP length.
  • a disclosed signal processing technique is used by the second node 400 to process the individual symbol 908 comprising second data and a CP with the extended CP length.
  • the disclosed signal processing technique may enable the first node 300 to accurately recover an intended symbol. Stated differently, the disclosed signal processing technique can be seen as an equalization technique.
  • the intended symbol may result from an equalization of the individual symbol comprising solely the second data.
  • the CP with the extended CP length may be removed before applying the disclosed signal processing technique.
  • the second node 400 can resume, to the first node 300, transmission of symbols using a configuration signal 1010.
  • Each symbol may comprise the first data and the CP having the predetermined CP length.
  • Fig. 11 is a signalling diagram 2000 illustrating an example communication between an example first node 300 and an example second node 300A, for enabling a CP with extended CP length during a sidelink transmission where the second node is about to perform a transmit beam switch according to this disclosure.
  • the first node 300 is a first wireless device and the second node 300A is a second wireless device.
  • the second node 300A determines the need for performing a transmit beam switch.
  • the second node 300A, acting as the second wireless device may perform the transmit beam switch during a SL transmission.
  • the second node 300A such as the second wireless device, needs to change a current beam pair to a new beam pair (e.g., due to changes in a channel communication propagation characteristic) that allows for an improved transmission of a symbol from the second node 300A to the first node 300.
  • the second node 300A may need to adapt a predetermined CP length (e.g., a regular CP length available in the numerology) to an extended CP length to mitigate the effect of the beam switching time on the transmission of that particular individual symbol to the first node 300.
  • the second node 300A may need to transmit, to the first node 300, the individual symbol comprising second data (e.g., payload data, and/or user data) and a CP with an extended CP length.
  • control signalling may be transmitted by the second node 300A indicating to the first node 300 the use of the CP with the extended CP in the individual symbol.
  • the second node 300A transmits, to the first node 300, symbols 2001.
  • Each symbol may have a predefined symbol duration.
  • Each symbol may comprise first data and a cyclic prefix, CP, having a predetermined CP length.
  • CP cyclic prefix
  • each symbol can be seen as an OFDM symbol.
  • the symbols can be seen as OFDM symbols.
  • the second node 300A transmits, to the first node 300, control signalling 2006 indicative of a temporary extension of CP length in one individual symbol having the same predefined symbol duration as any preceding and following symbol.
  • the second node 300A transmits, to the first node 300, the individual symbol 2010 comprising second data and a CP with an extended CP length.
  • the CP with the extended CP length may result from the temporary extension of the predetermined CP length in the one individual symbol having the same predefined symbol duration.
  • the control signalling 2006 can be seen as an indication to the second node 300A that the one individual symbol 2010 comprising the temporary extension of the CP length, such as an extension of a predetermined CP, is to be transmitted to the first node.
  • the second node 300A and the first node 300 can communicate to each other capability signalling 1002 indicative of a capability of the second node 300A and the first node 300 to perform a beam switch.
  • the second node 300 may determine the need for performing the transmit beam switch. For example, the second node 300 may perform a switching of a transmit beam pair used for communication between the first node 300 and the second node 300A across a communication channel (e.g. a wireless link).
  • a communication channel e.g. a wireless link
  • the first node 300 and the second node 300A can communicate to each other second information 2004.
  • the second information may be indicative of a negotiation of one or more beam switch parameters between the first node 300 and the second node 300A, as illustrated by S103 and S203 in Figs. 7-8.
  • the second node 300A can receive, from the first node 300, a response 2008 accepting the temporary extension of the CP length.
  • the first node 300 may accept the reception of the temporary extension of the CP length.
  • the first node 300 may accept the reception of the individual symbol 2010 comprising second data and a CP with the extended CP length.
  • the response 2008 accepting the temporary extension may be comprised in the control signalling 2006.
  • the second node 300A transmits, to the first node 300, the individual symbol 2010 comprising second data and a CP with an extended CP length.
  • a disclosed signal processing technique is used by the first node 300 to process the individual symbol 2010 comprising second data and a CP with the extended CP length.
  • the disclosed signal processing technique may enable the first node 300 to accurately recover an intended symbol. Stated differently, the disclosed signal processing technique can be seen as an equalization technique.
  • the intended symbol may result from an equalization of the individual symbol comprising solely the second data.
  • the CP with the extended CP length may be removed before applying the disclosed signal processing technique.
  • the second node 300A can resume, to the first node 300, transmission of symbols using a configuration signal 2012.
  • Each symbol may comprise the first data and the CP having the predetermined CP length.
  • the capability signalling 2002, the second information 2004, the control signalling 2006 and the response 2008 can be communicated between the first node and the second node via a network node.
  • Fig. 12 is a signalling diagram 3000 illustrating an example communication between an example first node 300 and an example second node 300A, for enabling a CP with extended CP length during a sidelink transmission where the second node is about to perform a receive beam switch according to this disclosure.
  • the first node 300 is a first wireless device and the second node 300A is a second wireless device.
  • the second node 300A determines the need for performing a receive beam switch.
  • the second node 300A acting as a second wireless device, may perform a receive beam switch during a SL transmission.
  • the second node 300A such as the second wireless device, needs to change a current beam pair to a new beam pair (e.g., due to changes in a channel communication propagation characteristic) that allows for an improved transmission of a symbol from the first node 300 to the second node 300A.
  • the first node 300 may need to adapt a predetermined CP length (e.g., a regular CP length available in the numerology) to an extended CP length to mitigate the effect of the beam switching time on the transmission of that particular individual symbol from the first node 300 to the second node 300A.
  • the first node 300 may need to transmit, to the second node 300A, the individual symbol comprising second data (e.g., payload data, and/or user data) and a CP with an extended CP length.
  • control signalling may be transmitted by the second node 300A requesting the first node 300 to use the CP with the extended CP in the individual symbol to be transmitted by the first node 300 to the second node 300A.
  • the second node 300A transmits, to the first node 300, symbols 3001. Each symbol may have a predefined symbol duration. Each symbol may comprise first data and a cyclic prefix, CP, having a predetermined CP length. For example, each symbol can be seen as an OFDM symbol. For example, the symbols can be seen as OFDM symbols.
  • the second node 300A transmits, to the first node 300, control signalling 3006 indicative of a temporary extension of CP length in one individual symbol having the same predefined symbol duration as any preceding and following symbol.
  • the second node 300A transmits, to the first node 300, the individual symbol 3010 comprising second data and a CP with an extended CP length.
  • the CP with the extended CP length may result from the temporary extension of the predetermined CP length in the one individual symbol having the same predefined symbol duration.
  • the control signalling 3006 can indicate to the first node 300 that an extension of the predetermined CP length is required in one individual symbol, with the one individual symbol having the same predefined symbol duration.
  • the second node 300A and the first node 300 can communicate to each other capability signalling 3002 indicative of a capability of the second node 300A and the first node 300 to perform a beam switch.
  • the second node 300 may determine the need for performing a receive beam switch. For example, the second node 300 may perform a switching of a receive beam pair used for communication between the first node 300 and the second node 300A across a communication channel (e.g. a wireless link).
  • a communication channel e.g. a wireless link
  • the first node 300 and the second node 300A can communicate to each other second information 3004.
  • the second information may be indicative of a negotiation of one or more beam switch parameters between the first node 300 and the second node 300A, as illustrated by S103 and S203 in Figs. 7-8.
  • the second node 300A can receive, from the first node 300, a response 3008 accepting the temporary extension of the CP length.
  • the first node 300 may accept the reception of the temporary extension of the CP length.
  • the second node 300A may accept the reception of the individual symbol 3010 comprising second data and a CP with the extended CP length.
  • the response 3008 accepting the temporary extension may be comprised in the control signalling 3006.
  • the first node 300 transmits, to the second node 300A, the individual symbol 3010 comprising second data and a CP with an extended CP length.
  • a disclosed signal processing technique is used by the second node 300A to process the individual symbol 3010 comprising second data and a CP with the extended CP length.
  • the disclosed signal processing technique may enable the second node 300A to accurately recover an intended symbol. Stated differently, the disclosed signal processing technique can be seen as an equalization technique.
  • the intended symbol may result from an equalization of the individual symbol comprising solely the second data.
  • the CP with the extended CP length may be removed before applying the disclosed signal processing technique.
  • the first node 300 can resume, to the second node 300A, transmission of symbols using a configuration signal 3012.
  • Each symbol may comprise the first data and the CP having the predetermined CP length.
  • the capability signalling 3002, the second information 3004, the control signalling 3006 and the response 3008 can be communicated between the first node and the second node via a network node.
  • Fig. 13 shows a block diagram of an example second node 400 according to the disclosure.
  • the second node 400 comprises memory circuitry 401 , processor circuitry 402, and a wireless interface 403.
  • the second node 400 may be configured to perform any of the methods disclosed in Fig. 12. In other words, the second node 400 may be configured for supporting beam switch.
  • the operations performed by second node 400 can also be performed by node 300A of Fig. 1 , Figs. 11-12.
  • the second node 400 is configured to communicate with a first node, such as the first node disclosed herein, using a wireless communication system.
  • the second node 400 is configured to communicate, for example, via the wireless interface 403, between the first node and the second node, using symbols.
  • Each symbol may have a predefined symbol duration.
  • Each symbol may comprise first data and a cyclic prefix, CP, having a predetermined CP length.
  • the second node 400 is configured to communicate, for example, via the wireless interface 403, between the first node and the second node, control signalling indicative of a temporary extension of the CP length in one individual symbol having the same predefined symbol duration.
  • the second node 400 is configured to communicate, for example, via the wireless interface 403, the individual symbol comprising second data and a CP with an extended CP length.
  • the wireless interface 403 is configured for wireless communications via a wireless communication system, such as a 3GPP system, such as a 3GPP system supporting one or more of: New Radio, NR, Narrow-band loT, NB-loT, and Long Term Evolution - enhanced Machine Type Communication, LTE-M, millimeter-wave communications, such as millimeter-wave communications in licensed bands, such as device-to-device millimeter-wave communications in licensed bands.
  • a wireless communication system such as a 3GPP system, such as a 3GPP system supporting one or more of: New Radio, NR, Narrow-band loT, NB-loT, and Long Term Evolution - enhanced Machine Type Communication, LTE-M
  • millimeter-wave communications such as millimeter-wave communications in licensed bands, such as device-to-device millimeter-wave communications in licensed bands.
  • Processor circuitry 402 is optionally configured to perform any of the operations disclosed in Fig. 2 (such as any one or more of S202, S202A, S202AA, S203, S203A, S203B, S204A, S204B, S204C, S206A, S206B, S208, S210).
  • the operations of the second node 400 may be embodied in the form of executable logic routines (for example, lines of code, software programs, etc.) that are stored on a non-transitory computer readable medium (for example, memory circuitry 401) and are executed by processor circuitry 402.
  • the operations of the second node 400 may be considered a method that the second node 400 is configured to carry out. Also, while the described functions and operations may be implemented in software, such functionality may also be carried out via dedicated hardware or firmware, or some combination of hardware, firmware and/or software.
  • Memory circuitry 401 may be one or more of a buffer, a flash memory, a hard drive, a removable media, a volatile memory, a non-volatile memory, a random access memory (RAM), or other suitable device.
  • memory circuitry 401 may include a non-volatile memory for long term data storage and a volatile memory that functions as system memory for processor circuitry 402.
  • Memory circuitry 401 may exchange data with processor circuitry 402 over a data bus. Control lines and an address bus between memory circuitry 401 and processor circuitry 402 also may be present (not shown in Fig. 4).
  • Memory circuitry 401 is considered a non-transitory computer readable medium.
  • Memory circuitry 401 may be configured to store one or more of: how to process the individual symbol including the CP with the extended CP length, beam pair information, time required to perform the beam switch, and the construction of the CP having the extended CP length, in a part of the memory.
  • Fig. 14 shows a block diagram of an example first node 300 according to the disclosure.
  • the first node 300 comprises memory circuitry 301 , processor circuitry 302, and a wireless interface 303.
  • the first node 300 may be configured to perform any of the methods disclosed in Fig. 11 . In other words, the first node 300 may be configured for supporting beam switching.
  • the first node 300 is configured to communicate with a second node, such as the first node disclosed herein, using a wireless communication system.
  • the first node 300 is configured to communicate, for example, via the wireless interface 303, between the first node and a second node, using symbols.
  • Each symbol may have a predefined symbol duration.
  • Each symbol may comprise first data and a cyclic prefix, CP, having a predetermined CP length.
  • the first node 300 is configured to communicate, for example, via the wireless interface 303, between the first node and the second node, control signalling indicative of a temporary extension of the CP length in one individual symbol having the same predefined symbol duration.
  • the first node 300 is configured to communicate, for example, via the wireless interface 303, the individual symbol comprising second data and a CP with an extended CP length.
  • the wireless interface 303 is configured for wireless communications via a wireless communication system, such as a 3GPP system, such as a 3GPP system supporting one or more of: New Radio, NR, Narrow-band loT, NB-loT, and Long Term Evolution - enhanced Machine Type Communication, LTE-M, millimeter-wave communications, such as millimeter-wave communications in licensed bands, such as device-to-device millimeter-wave communications in licensed bands.
  • a wireless communication system such as a 3GPP system, such as a 3GPP system supporting one or more of: New Radio, NR, Narrow-band loT, NB-loT, and Long Term Evolution - enhanced Machine Type Communication, LTE-M
  • millimeter-wave communications such as millimeter-wave communications in licensed bands, such as device-to-device millimeter-wave communications in licensed bands.
  • the first node 300 is optionally configured to perform any of the operations disclosed in Fig. 11 (such as any one or more of S102, S102A, S102AA, S103, S103A, S103B, S104A, S104B, S104C, S106A, S106B, S108, S110).
  • the operations of the first node 300 may be embodied in the form of executable logic routines (for example, lines of code, software programs, etc.) that are stored on a non-transitory computer readable medium (for example, memory circuitry 301) and are executed by processor circuitry 302.
  • the operations of the first node 300 may be considered a method that the first node 300 is configured to carry out. Also, while the described functions and operations may be implemented in software, such functionality may also be carried out via dedicated hardware or firmware, or some combination of hardware, firmware and/or software.
  • Memory circuitry 301 may be one or more of a buffer, a flash memory, a hard drive, a removable media, a volatile memory, a non-volatile memory, a random access memory (RAM), or other suitable device.
  • memory circuitry 301 may include a non-volatile memory for long term data storage and a volatile memory that functions as system memory for processor circuitry 302.
  • Memory circuitry 301 may exchange data with processor circuitry 302 over a data bus. Control lines and an address bus between memory circuitry 301 and processor circuitry 302 also may be present (not shown in Fig. 13).
  • Memory circuitry 301 is considered a non-transitory computer readable medium.
  • Memory circuitry 301 may be configured to store one or more of: how to process the individual symbol including the CP with the extended CP length, beam pair information, time required to perform the beam switch, and the construction of the CP having the extended CP length, in a part of the memory.
  • Item 1 A method, performed by a first node, the method comprising: communicating (S101), between the first node and a second node, using symbols wherein each symbol has a predefined symbol duration, wherein each symbol comprises first data and a cyclic prefix, CP, having a predetermined CP length; communicating (S104), between the first node and the second node, control signalling indicative of a temporary extension of CP length in one individual symbol having the same predefined symbol duration; and communicating (S106) the individual symbol comprising second data and a CP with an extended CP length.
  • control signalling comprises first information indicating how to process the communicated individual symbol including the CP with the extended CP length.
  • Item 3 The method according to any of the previous items, wherein the control signalling is indicative of the extended CP length and/or of a length of the second data.
  • Item 4 The method according to any of the previous items, wherein the control signalling is indicative of construction of the CP having the extended CP length.
  • Item 5 The method according to item 4, wherein the construction is based on at least a part of the second data.
  • Item 6 The method according to any of the previous items, wherein the extended CP length is associated with a time required for the first node to perform a beam switch.
  • Item 7 The method according to any of the previous items, wherein the CP having the extended CP length comprises the CP having the predetermined CP length and an additional CP.
  • Item 8 The method according to any of the previous items, wherein communicating (S104), between the first node and the second node, the control signalling indicative of the temporary extension of CP length comprises:
  • Item 9 The method according to any of the previous items, wherein communicating (S104), between the first node and the second node, the control signalling indicative of the temporary extension of CP length comprises: receiving (S104B), from the second node, the control signalling indicative of the temporary extension of CP length.
  • Item 10 The method according to any of items 8-9, wherein the control signalling indicative of the temporary extension of CP length comprises a request requesting the extended CP length.
  • Item 11 The method according to item 10, wherein the request comprises an extension time parameter.
  • Item 12 The method according to any of the previous items, wherein communicating (S104), between the first node and the second node, the control signalling indicative of the temporary extension of CP length comprises: receiving (S104C), from the second node, a response accepting the temporary extension of CP length.
  • Item 13 The method according to any of items 6-12, the method comprising:
  • Item 15 The method according to item 14, wherein transmitting (S102A), to the second node, information indicating that the beam switch is to be applied by the first node comprises: determining (S102AA) the need for performing the beam switch.
  • Item 16 The method according to any of the previous items, the method comprising: communicating (S103), between the first node and the second node, second information indicative of a negotiation of one or more beam switch parameters between the first node and the second node.
  • Item 17 The method according to item 16, wherein communicating (S103), between the first node and the second node, the second information indicative of the negotiation comprises: transmitting (S103A), to the second node, a request for a change in at least one sample parameter.
  • Item 18 The method according to item 4 and 17, wherein the at least one sample parameter is associated with the construction of the CP having the extended CP length.
  • Item 19 The method according to any of items 16-17, wherein communicating (S103), between the first node and the second node, the second information indicative of the negotiation comprises: receiving (S103B), from the second node, a response indicative of a change in the power associated with the second data after performing the beam switch.
  • Item 20 The method according to any of the previous items, wherein communicating (S106) the individual symbol comprising the second data and the CP with extended CP length comprises:
  • Item 21 The method according to any of the previous items, wherein communicating (S106) the individual symbol comprising the second data and the CP with extended CP length comprises: receiving (S106B), from the second node, the individual symbol comprising the second data and the CP with the extended CP length.
  • Item 22 The method according to item 20, the method comprising: resuming (S108) transmission of symbols to the second node, wherein each symbol comprises the first data and the CP having the predetermined CP length.
  • Item 23 The method according to item 21 , the method comprising: resuming (S110) reception of symbols from the second node, wherein each symbol comprises the first data and the CP having the predetermined CP length.
  • Item 24 The method according to any of the previous items, wherein the first node is a wireless device, and the second node is a network node.
  • Item 25 The method according to any of the previous items, wherein the first node is a first wireless device, and the second node is a second wireless device.
  • Item 26 A method, performed by a second node, the method comprising: communicating (S201 ), between a first node and the second node, using symbols wherein each symbol has a predefined symbol duration, wherein each symbol comprises first data and a cyclic prefix, CP, having a predetermined CP length; communicating (S204), between the first node and the second node, control signalling indicative of a temporary extension of CP length in one individual symbol having the same predefined symbol duration; and communicating (S206) the individual symbol comprising second data and a CP with an extended CP length.
  • control signalling comprises first information indicating how to process the communicated individual symbol including the CP with the extended CP length.
  • Item 28 The method according to any of items 26-27, wherein the control signalling is indicative of the extended CP length and/or of a length of the second data.
  • Item 29 The method according to any of items 26-28, wherein the control signalling is indicative of construction of the CP having the extended CP length.
  • Item 30 The method according to item 29, wherein the construction is based on at least a part of the second data.
  • Item 31 The method according to any of items 26-30, wherein the extended CP length is associated with a time required for the first node to perform a beam switch.
  • Item 32 The method according to any of items 26-31 , wherein the CP having the extended CP length comprises the CP having the predetermined CP length and an additional CP.
  • Item 33 The method according to any of items 26-32, wherein communicating (S204), between the first node and the second node, the control signalling indicative of the temporary extension of CP length comprises: receiving (S204A), from the first node, the control signalling indicative of the temporary extension of CP length.
  • Item 34 The method according to any of items 26-33, wherein communicating (S204), between the first node and the second node, the control signalling indicative of the temporary extension of CP length comprises:
  • Item 35 The method according to any of items 33-34, wherein the control signalling indicative of the temporary extension of CP length comprises a request requesting the extended CP length.
  • Item 36 The method according to item 35, wherein the request comprises an extension time parameter.
  • Item 37 The method according to any of items 26-36, wherein communicating (S204), between the first node and the second node, the control signalling indicative of the temporary extension of CP length comprises:
  • Item 38 The method according to any of items 31-37, the method comprising:
  • Item 39 The method according to item 38, wherein receiving (S202), from the first node, the capability signalling indicative of the capability of the first node to perform the beam switch comprises: receiving (S202A), from the first node, information indicating that the beam switch is to be applied by the first node.
  • Item 40 The method according to item 38, the method comprising: determining (S202AA) the need for performing the beam switch.
  • Item 41 The method according to any of items 31-40, the method comprising: communicating (S203), between the first node and the second node, second information indicative of a negotiation of one or more beam switch parameters between the first node and the second node.
  • Item 42 The method according to item 41 , wherein communicating (S203), between the first node and the second node, the second information indicative of the negotiation comprises: receiving (S203A), from the first node, a request for a change in at least one sample parameter.
  • Item 43 The method according to items 29 and 42, wherein the at least one sample parameter is associated with the construction of the CP having the extended CP length.
  • Item 45 The method according to any of items 26-44, wherein communicating (S206) the individual symbol comprising the second data and the CP with extended CP length comprises: receiving (S206A), from the first node, the individual symbol comprising the second data and the CP with the extended CP length.
  • Item 46 The method according to any of items 26-45, wherein communicating (S206) the individual symbol comprising the second data and the CP with extended CP length comprises:
  • Item 47 The method according to item 45, the method comprising: resuming (S208) reception of symbols, from the first node, wherein each symbol comprises the first data and the CP having the predetermined CP length.
  • Item 48 The method according to according to item 46, the method comprising: resuming (S210) transmission of symbols, to the first node, wherein each symbol comprises the first data and the CP having the predetermined CP length.
  • Item 49 The method according to any of items 26-48, wherein the first node is a wireless device, and the second node is a network node.
  • Item 50 The method according to any of items 26-49, wherein the first node is a first wireless device, and the second node is a second wireless device.
  • a first node comprising memory circuitry, processor circuitry, and a wireless interface, wherein the first node is configured to perform any of the methods according to any of items 1-25.
  • Item 52 A second node comprising memory circuitry, processor circuitry, and a wireless interface, wherein the second node is configured to perform any of the methods according to any of items 26-50.
  • first”, “second”, “third” and “fourth”, “primary”, “secondary”, “tertiary” etc. does not imply any particular order, but are included to identify individual elements.
  • the use of the terms “first”, “second”, “third” and “fourth”, “primary”, “secondary”, “tertiary” etc. does not denote any order or importance, but rather the terms “first”, “second”, “third” and “fourth”, “primary”, “secondary”, “tertiary” etc. are used to distinguish one element from another.
  • the words “first”, “second”, “third” and “fourth”, “primary”, “secondary”, “tertiary” etc. are used here and elsewhere for labelling purposes only and are not intended to denote any specific spatial or temporal ordering.
  • the labelling of a first element does not imply the presence of a second element and vice versa.
  • Figures comprise some circuitries or operations which are illustrated with a solid line and some circuitries, components, features, or operations which are illustrated with a dashed line.
  • Circuitries or operations which are comprised in a solid line are circuitries, components, features, or operations which are comprised in the broadest example.
  • Circuitries, components, features, or operations which are comprised in a dashed line are examples which may be comprised in, or a part of, or are further circuitries, components, features, or operations which may be taken in addition to circuitries, components, features, or operations of the solid line examples. It should be appreciated that these operations need not be performed in order presented.
  • Circuitries, components, features, or operations which are comprised in a dashed line may be considered optional.
  • a computer-readable medium may include removable and non-removable storage devices including, but not limited to, Read Only Memory (ROM), Random Access Memory (RAM), compact discs (CDs), digital versatile discs (DVD), etc.
  • program circuitries may include routines, programs, objects, components, data structures, etc. that perform specified tasks or implement specific abstract data types.
  • Computer-executable instructions, associated data structures, and program circuitries represent examples of program code for executing steps of the methods disclosed herein. The particular sequence of such executable instructions or associated data structures represents examples of corresponding acts for implementing the functions described in such steps or processes.

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

Abstract

L'invention concerne un procédé exécuté par un premier nœud. Le procédé comprend la communication, entre le premier nœud et un second nœud, à l'aide de symboles. Chaque symbole a une durée de symbole prédéfinie. Chaque symbole comprend des données initiales et un préfixe cyclique (CP) d'une longueur prédéterminée. Le procédé comprend la communication, entre le premier nœud et le second nœud, d'une signalisation de commande indiquant une extension temporaire de la longueur du CP dans un symbole individuel ayant la même durée de symbole prédéfinie. Le procédé consiste à communiquer le symbole individuel comprenant les deuxièmes données et un CP avec une longueur de CP étendue.
PCT/EP2023/067237 2022-07-13 2023-06-26 Procédé de prise en charge de la commutation de faisceaux, d'un premier nœud apparenté et d'un second nœud apparenté Ceased WO2024012855A1 (fr)

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SE2250903 2022-07-13
SE2250903-8 2022-07-13

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1881968A (zh) * 2005-06-15 2006-12-20 华为技术有限公司 一种减小多径延迟干扰的数据传输方法
WO2017112694A1 (fr) * 2015-12-22 2017-06-29 Idac Holdings, Inc. Adaptation de la durée d'un préfixe cyclique par rapport à l'étalement du retard pendant le maintien de la durée d'un symbole
WO2022038583A1 (fr) * 2020-08-21 2022-02-24 Lenovo (Singapore) Pte. Ltd. Insertion d'intervalles de commutation de faisceaux entre des transmissions de faisceaux
US20220078817A1 (en) * 2020-09-04 2022-03-10 Qualcomm Incorporated Interference mitigation for wireless communication
WO2022080954A1 (fr) * 2020-10-15 2022-04-21 엘지전자 주식회사 Procédé et dispositif d'émission/de réception de signaux dans un système de communication sans fil

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1881968A (zh) * 2005-06-15 2006-12-20 华为技术有限公司 一种减小多径延迟干扰的数据传输方法
WO2017112694A1 (fr) * 2015-12-22 2017-06-29 Idac Holdings, Inc. Adaptation de la durée d'un préfixe cyclique par rapport à l'étalement du retard pendant le maintien de la durée d'un symbole
WO2022038583A1 (fr) * 2020-08-21 2022-02-24 Lenovo (Singapore) Pte. Ltd. Insertion d'intervalles de commutation de faisceaux entre des transmissions de faisceaux
US20220078817A1 (en) * 2020-09-04 2022-03-10 Qualcomm Incorporated Interference mitigation for wireless communication
WO2022080954A1 (fr) * 2020-10-15 2022-04-21 엘지전자 주식회사 Procédé et dispositif d'émission/de réception de signaux dans un système de communication sans fil
EP4231598A1 (fr) * 2020-10-15 2023-08-23 Lg Electronics Inc. Procédé et dispositif d'émission/de réception de signaux dans un système de communication sans fil

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