WO2024068059A1 - Accès aléatoire amélioré dans des réseaux de communication cellulaire - Google Patents

Accès aléatoire amélioré dans des réseaux de communication cellulaire Download PDF

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Publication number
WO2024068059A1
WO2024068059A1 PCT/EP2023/067062 EP2023067062W WO2024068059A1 WO 2024068059 A1 WO2024068059 A1 WO 2024068059A1 EP 2023067062 W EP2023067062 W EP 2023067062W WO 2024068059 A1 WO2024068059 A1 WO 2024068059A1
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WIPO (PCT)
Prior art keywords
repetitions
waveform
connection request
random access
transmission
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PCT/EP2023/067062
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English (en)
Inventor
Amir Mehdi AHMADIAN TEHRANI
Alessio MARCONE
Nhat-Quang NHAN
Marco MASO
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Nokia Technologies Oy
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Publication of WO2024068059A1 publication Critical patent/WO2024068059A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT

Definitions

  • Various example embodiments relate in general to cellular communication networks and more specifically, to random access in such systems.
  • Random access may be used to access a wireless communication network, e.g., to request a dedicated connection to be arranged for a wireless terminal requesting the access. Random access may be used for example in various cellular communication networks, such as, in cellular communication networks operating according to 5G radio access technology.
  • 5G radio access technology may also be referred to as New Radio, NR, access technology and 3rd Generation Partnership Project, 3GPP, develops standards for 5G/NR.
  • NR New Radio
  • 3GPP 3rd Generation Partnership Project
  • an apparatus comprising means for transmitting, to a wireless network node, a random access preamble with repetition using a quantity of repetitions, means for selecting, based on said quantity of repetitions and one of at least one repetition threshold, a waveform for transmission of a connection request and means for transmitting, to the wireless network node, the connection request using the selected waveform.
  • the apparatus of the first aspect may be a user equipment or a control device configured to control the functioning thereof, possibly when installed therein.
  • Example embodiments of the first aspect may comprise at least one feature from the following bulleted list or any combination of the following features:
  • said means for selecting the waveform further comprises means for comparing said quantity of repetitions to said one of at least one repetition threshold and means for selecting, based on said comparison, the waveform for transmission of the connection request;
  • means for selecting the waveform further comprises means for selecting a first or a second waveform as the waveform for transmission of the connection request;
  • first waveform is Discrete Fourier Transform spread Orthogonal Frequency Division, DFT-s-OFDM
  • the second waveform is Cyclic Prefix Orthogonal Frequency Division, CP-OFDM
  • said apparatus further comprises means for selecting the first waveform when said quantity of repetitions is less than, or equal to, said one of at least one repetition threshold and means for selecting the second waveform when said quantity of repetitions is larger than said one of at least one repetition threshold;
  • said apparatus further comprises means for selecting the second waveform when said quantity of repetitions is less than, or equal to, said one of at least one repetition threshold and means for selecting the first waveform when said quantity of repetitions is larger than said one of at least one repetition threshold;
  • the apparatus further comprises means for receiving, from the wireless network node, a configuration configuring the at least one repetition threshold for transmission of the random access preamble;
  • the apparatus further comprises means for ignoring, after receiving said configuration, a transform precoder parameter for transmission of the connection request;
  • an apparatus comprising means for receiving, from a user equipment, a random access preamble with repetition using a quantity of repetitions, means for selecting, based on said quantity of repetitions and one of at least one repetition threshold, a waveform for reception of a connection request and means for receiving, from the user equipment, the connection request using the selected waveform.
  • the apparatus of the second aspect may be a wireless network node or a control device configured to control the functioning thereof, possibly when installed therein.
  • a first method comprising, transmitting by an apparatus, to a wireless network node, a random access preamble with repetition using a quantity of repetitions, selecting by the apparatus, based on said quantity of repetitions and one of at least one repetition threshold, a waveform for transmission of a connection request and transmitting by the apparatus, to the wireless network node, the connection request using the selected waveform.
  • the first method may be performed by a user equipment or a control device configured to control the functioning thereof, possibly when installed therein.
  • a second method comprising, receiving by an apparatus, from a user equipment, a random access preamble with repetition using a quantity of repetitions, selecting by the apparatus, based on said quantity of repetitions and one of at least one repetition threshold, a waveform for reception of a connection request and receiving by the apparatus, from the user equipment, the connection request using the selected waveform.
  • the second method may be performed by a wireless network node or a control device configured to control the functioning thereof, possibly when installed therein.
  • an apparatus comprising at least one processing core, at least one memory including computer program code, the at least one memory and the computer program code being configured to, with the at least one processing core, cause the apparatus at least to transmit by an apparatus, to a wireless network node, a random access preamble with repetition using a quantity of repetitions, select by the apparatus, based on said quantity of repetitions and one of at least one repetition threshold, a waveform for transmission of a connection request and transmit by the apparatus, to the wireless network node, the connection request using the selected waveform.
  • the apparatus of the fifth aspect may be a user equipment or a control device configured to control the functioning thereof, possibly when installed therein.
  • an apparatus comprising at least one processing core, at least one memory including computer program code, the at least one memory and the computer program code being configured to, with the at least one processing core, cause the apparatus at least to receive by an apparatus, from a user equipment, a random access preamble with repetition using a quantity of repetitions, select by the apparatus, based on said quantity of repetitions and one of at least one repetition threshold, a waveform for reception of a connection request and receive by the apparatus, from the user equipment, the connection request using the selected waveform.
  • the apparatus of the second aspect may be a wireless network node or a control device configured to control the functioning thereof, possibly when installed therein.
  • a non-transitory computer readable medium having stored thereon a set of computer readable instructions that, when executed by at least one processor, cause an apparatus to at least to perform the first method.
  • a non-transitory computer readable medium having stored thereon a set of computer readable instructions that, when executed by at least one processor, cause an apparatus to at least to perform the second method.
  • a computer program comprising instructions which, when the program is executed by an apparatus, cause the apparatus to carry out the first method.
  • a computer program comprising instructions which, when the program is executed by an apparatus, cause the apparatus to carry out the second method.
  • FIGURE 1 illustrates an example of a network scenario in accordance with at least some example embodiments
  • FIGURE 2 illustrates a 4-step RACH procedure in accordance with at least some example embodiments
  • FIGURE 3 illustrates an example association of number of PRACH repetitions and SS-RSRP
  • FIGURE 4 illustrates a signalling graph in accordance with at least some example embodiments
  • FIGURE 5 illustrates an example apparatus capable of supporting at least some example embodiments
  • FIGURE 6 illustrates a flow graph of a first method in accordance with at least some example embodiments.
  • Random access may be enhanced by the procedures described herein. More specifically, random access in cellular communication networks may be enhanced by making it possible for a User Equipment, UE, to select a waveform for transmitting a connection request, such as a third message (Msg3) of a 4-step random access procedure.
  • the UE may select the waveform based on a quantity of repetitions of a random access preamble, like a first message (Msgl) of the 4-step random access procedure.
  • Said quantity of repetitions may refer to a number of beams or a number of repetitions used to transmit the random access preamble with repetition and hence, said quantity of repetitions may represent at least implicitly a link budget expected to be experienced by the UE during the transmissions of the random access preamble and the connection request. Therefore, the UE may select the waveform for transmission of the connection request by taking into account its expected link budget.
  • FIGURE 1 illustrates an example of a network scenario in accordance with at least some example embodiments.
  • a beam-based wireless communication system which comprises UE 110, wireless network node 120 and core network element 130.
  • UE 110 may be connected to wireless network node 120 via air interface using beam 112 or 114.
  • UE 110 may sweep transmit beams from beam 112 to beam 114 during a random access procedure.
  • UE 110 may comprise, for example, a smartphone, a cellular phone, a Machine-to-Machine, M2M, node, Machine-Type Communications, MTC, node, an Internet of Things, loT, node, a car telemetry unit, a laptop computer, a tablet computer or, indeed, any kind of suitable wireless terminal.
  • UE 110 may communicate wirelessly with wireless network node 120 for example via beam 112 or beam 114.
  • Wireless network node 120 may be considered as a serving node for UE 110 and one cell of wireless network node 120 may be a serving cell for UE 110.
  • Air interface between UE 110 and wireless network node 120 may be configured in accordance with a Radio Access Technology, RAT, which both UE 110 and wireless network node 120 are configured to support.
  • RAT Radio Access Technology
  • Examples of cellular RATs include Long Term Evolution, LTE, New Radio, NR, which may also be known as fifth generation, 5G, radio access technology and MulteFire.
  • wireless network node 120 may be referred to as eNB while wireless network node 120 may be referred to as gNB in the context of NR.
  • wireless network node 120 may be referred to as a Transmission and Reception Point, TRP, or control multiple TRPs that may be co-located or non-co-located.
  • TRP Transmission and Reception Point
  • example embodiments of the present disclosure are not restricted to any particular wireless technology. Instead, example embodiments may be exploited in any wireless communication system, wherein random access with repetitions is used.
  • Wireless network node 120 may be connected, directly or via at least one intermediate node, with core network 130 via interface 125.
  • Core network 130 may be, in turn, coupled via interface 135 with another network (not shown in FIGURE 1), via which connectivity to further networks may be obtained, for example via a worldwide interconnection network.
  • Wireless network node 120 may be connected, directly or via at least one intermediate node, with core network 130 or with another core network.
  • At least some example embodiments of the present disclosure relate to dynamic switching between at least two waveforms for transmitting a connection request during a random access procedure.
  • example embodiments of the present disclosure may be applied in cellular communication networks to enable dynamic waveform switching between Discrete Fourier Transform spread Orthogonal Frequency Division Multiplexing, DFT-s-OFDM and Cyclic Prefix, CP, -OFDM.
  • Said dynamic switching may be applied, e.g., for Physical Uplink Shared Channel, PUSCH, transmission of a third message (Msg3) during a 4-step Random Access Channel, RACH, procedure.
  • Msg3 Physical Uplink Shared Channel
  • RACH Random Access Channel
  • Said dynamic switching may depend on transmissions of a first message (Msgl) of the 4-step RACH procedure with repetition.
  • example embodiments of the present disclosure may be applied for selection between any at least two waveforms, wherein some waveforms are more robust in terms of link budget than the others. For instance, if there are two waveforms, selection of the waveform for transmission of the connection request may be performed between a first waveform, like DFT-s-OFDM, and a second waveform, like CP-OFDM, wherein one of the waveforms is more robust than the other waveform.
  • DFT-s-OFDM may be more robust than CP-OFDM, but it is noted that DFT-s-OFDM may not always be more robust than CP-OFDM.
  • NR supports said two waveforms in Uplink, UE, DFT-s- OFDM and CP-OFDM.
  • DFT-s-OFDM supports single layer transmission while CP-OFDM supports multi-layer UL transmission.
  • a network node such as wireless network node 120, may configure a single waveform for UL transmission semi-statically.
  • wireless network node 120 may configure only one waveform. So even though UE 110 would support multiple transmit antennas, it may be expected to transmit with one layer, e.g., only with a single layer, if configured with DFT-s-OFDM waveform.
  • the network node may configure CP-OFDM waveform for UL transmission to exploit MultiInput Multi-Output, MIMO, transmissions in UL.
  • DFT-s-OFDM offers a lower Peak to Average Power Ratio, PAPR, compared to CP-OFDM, and hence larger deliverable power at the power amplifier of UE 110. Therefore, when UE 110 is at cell edge, DFT-s-OFDM waveform provides better coverage due to power efficiency compared to CP- OFDM, wherein power efficiency is achieved by the lower PAPR.
  • Wireless network node 120 may configure the UL waveform in semi-static manner via Radio Resource Control, RRC, signalling, e.g., in current NR Rel- 15/Rel-16/Rel-17 specifications (3GPP TR 38.214, section 6.1.3).
  • RRC Radio Resource Control
  • the UL waveform would be configured via RRC, such a limitation would impose a large barrier to switch over to DFT-S-OFDM waveform for cell-edge UEs in practice.
  • FIGURE 2 illustrates a 4-step RACH procedure in accordance with at least some example embodiments.
  • UE 110 On the vertical axes are disposed, from the left to the right, UE 110 and wireless network node 120 of FIGURE 1. Time advances from the top towards the bottom.
  • UE 110 may transmit a random access preamble in a first message of the 4-step RACH procedure (Msgl, a.k.a. Physical RACH, PRACH) to wireless network node 120, such as a gNB.
  • UE 110 may for example transmit a specific preamble to wireless network node 120 via PRACH using a specific resource, such as a RACH occasion.
  • wireless network node 120 may transmit, responsive to receiving the random access preamble, a random access response message, which may comprise the detected preamble identity, the time-advance command, a temporary cell radio network temporary identifier, and an UL grant for the transmission of a connection request, e.g., a Msg3 on PUSCH.
  • the random access response message may be a second message (Msg2) of the 4-step RACH procedure.
  • UE 110 may respond to the random access response message by transmitting the connection request.
  • the connection request may be a RRC request.
  • the connection request may be transmitted in a third message (Msg3) of the 4-step RACH procedure.
  • the connection request may be transmitted over the PUSCH scheduled in the UL grant, possibly with an identity for contention resolution.
  • wireless network node 120 may transmit, responsive to receiving the connection request, a contention resolution message as a fourth message (Msg4) of the 4-step RACH procedure.
  • the contention resolution message may be a setup message, like RRC setup message.
  • wireless network node 120 may transmit the contention resolution message with the identity for contention resolution.
  • UE 110 may transmit an acknowledgement on a Physical Uplink Control Channel, PUCCH, if the identity for contention resolution of UE 110 was carried in the contention resolution message, thereby completing the 4-step RACH procedure.
  • PUCCH Physical Uplink Control Channel
  • UE 110 may select an index of the preferred SSB beam and decode the associated Physical Broadcast Channel, PBCH, for a Master Information Block, MIB, System Information Block, SIB, and so on.
  • the index may also be used by UE 110 to identify a suitable RACH occasion for the transmission of the random access preamble, such as Msgl, according to the SSB-to-RACH occasion mapping conveyed by SIB1.
  • Wireless network node 120 may then use the SSB beam index selected by UE 110 for transmission of the random access response message, such as Msg2.
  • Multiple transmissions of a random access preamble may be introduced to extend the coverage of UE 110 during random access.
  • multiple PRACH transmissions may be introduced to extend the coverage of the PRACH channel.
  • UE 110 may have the possibility to transmit PRACH multiple times (i.e., PRACH repetitions) before receiving a random access response from wireless network node 120, to improve detection performance.
  • PRACH repetitions i.e., PRACH repetitions
  • one metric to consider may be the Synchronization Signal - Reference Signal Received Power, SS-RSRP, of the associated SSB.
  • SS-RSRP Synchronization Signal - Reference Signal Received Power
  • Different SS-RSRP thresholds may be defined and each threshold may be associated to a number of repetitions.
  • FIGURE 3 illustrates an example association of number of PRACH repetitions and SS-RSRP.
  • UE 110 may measure an SS-RSRP of around - 82dBm associated with a number of 2 PRACH repetitions.
  • Wireless network node 120 may then be able to infer channel conditions of UE 110 by the number of repetitions UE 110 transmits the random access preamble, like Msgl.
  • such implicit information may finally be used for determining a waveform for the subsequent connection request, like Msg3.
  • UE 110 may know the correct panel from listening to SSB and sweep a limited number of transmission beams (e.g., 4) on this same panel.
  • the choice of the limited transmit beams may be determined by UE 110 based on the SSB received from wireless network node 120, but the number of beams may be generally unknown to wireless network node 120 and depend on implementation of UE 110.
  • the number of beams used by UE 110 for transmission of the random access preamble with sweeping which may be lower than or equal to the number of repetitions of the random access preamble, e.g., the number of PRACH repetitions, may also be used as an indicator of a link budget of UE 110.
  • the number of beams may hence indicate whether the connection request should be transmitted using a first waveform, like DFT-s-OFDM, or a second waveform, like CP-OFDM. For instance, the larger the number of beams per one panel of UE 110, the narrower such beams may be expected to be with a larger peak gain that would finally yield a better UL link budget.
  • wireless network node 120 may infer that a large number of beams may be associated with a less robust waveform, such as CP-OFDM, whereas a small number of beams may be associated with a more robust waveform, such as DFT-s-OFDM. Nevertheless, DFT-s-OFDM may not always be more robust than CP-OFDM and in such a case, a large number of beams may be associated with DFT-s-OFDM and a small number of beams may be associated with CP- OFDM.
  • UE 110 may repeat the transmission over multiple different RACH occasions before receiving a random access response message.
  • UE 110 may be a Coverage Enhancement, CE, UE, and initiate the repetitions when the RSRP is very low, in which case transmission of the corresponding connection request may be expected to suffer from poor performance due to the distance between UE 110 and wireless network node 120.
  • the number of the repetitions of the random access preamble may need to be UE-specific. So if no rules or configurations exist for selecting a robust waveform for transmission of the corresponding connection request, UE 110 may experience coverage shortage for the transmission of the connection request due to not selecting a proper waveform, even if the connection request would be transmitted with repetitions. Furthermore, it may be reasonable to assume that if UE 110 assesses that coverage of the random access preamble transmission could be poor, all the available tools for improving the coverage of the connection request should be used, for example in NR.
  • UE 110 like a CE UE, to select a waveform for its connection request transmission considering the link budget expected to be experienced by UE 110 during the repetitions of the random access preamble transmissions, in addition to taking into account based on semi-static configuration provided a by higher-layer and wireless network node 120.
  • a transform precoder parameter for the connection request like msg3-transformPrecoder, may be configured before transmission of the random access preamble. In such a case, the transform precoder parameter would be configured without considering the actual channel conditions of a specific UE, like UE 110.
  • Example embodiments of the present disclosure therefore enable selection of a waveform by UE 110, such as a CE UE, for transmission of a connection request, like Msg3, during a 4-step random access procedure.
  • UE 110 may for example select the waveform based on its expected link budget.
  • UE 110 may select the waveform during repetition of a transmission of a random access preamble, e.g., Msgl repetition, irrespective of the waveform configured by wireless network node 120 for the transmission of the connection request, for example using parameter msg3-transformPrecoder.
  • a set of conditions over which a waveform selection for the transmission of the connection request may be performed by UE 110 is also provided.
  • Wireless network node 120 may select the waveform for reception of the connection request in the same way as UE 110.
  • a repetition threshold associated with beams like Msgl beams repetitions thr, may be defined as a threshold for distinguishing whether a lower number of beams (e.g., 2 beams) or a higher number of beams (e.g., 8 beams) is used for transmission of the random access preamble with repetitions, in a Msgl for example.
  • a repetition threshold associated with a number of repetitions may be applied as a threshold for distinguishing whether a lower number of repetitions (e.g., 2 repetitions) or a higher number of repetitions (e.g., 8 beams) is being used for the transmission of the random access preamble.
  • a quantity of repetitions may refer to a number of beams or a number of repetitions used for transmission of the random access preamble.
  • Wireless network node 120 may configure at least one repetition threshold (Msgl beams repetitions thr and/or Msgl number of repetitions thr) for UE 110 and UE 110 may be allowed to select the most suitable waveform for the subsequent transmission of the connection request, like Msg3, as a function of a comparison between configured threshold(s) and decisions taken by UE 110 itself concerning the transmission of the random access preamble.
  • Msgl beams repetitions thr and/or Msgl number of repetitions thr may be allowed to select the most suitable waveform for the subsequent transmission of the connection request, like Msg3, as a function of a comparison between configured threshold(s) and decisions taken by UE 110 itself concerning the transmission of the random access preamble.
  • UE 110 may ignore a transform precoder parameter, for example the content of the higher layer parameter msg3- transformPrecoder.
  • UE 110 may use the threshold associated with beams (Msgl beams repetitions thr) when repetitions of the random access preamble are transmitted with different transmit beams considering the limited beamforming capabilities of UE 110.
  • the threshold associated with a number of repetitions (Msgl number of repetitions thr) may be used by UE 110 when repetitions of the random access preamble are transmitted with the same transmit beam or different transmit beams.
  • UE 110 may transmit the random access preamble with repetition based on RSRP measurements performed by UE 110, either depending on the number of beams available at UE 110 by implementation or depending on the measured RSRP.
  • the repetition threshold configured by wireless network node 120
  • the quantity of repetitions may refer to a number of beams as well.
  • UE 110 may ignore a transform precoder parameter configured by wireless network node 120. For instance, UE 110 may ignore the content of the higher layer parameter msg3-transformPrecoder. UE 110 may then select the waveform for transmission of the connection request, like an UL waveform for the subsequent Msg3 transmission, as follows:
  • UE 110 may compare a number of beams used for transmission of the random access preamble with repetition to the repetition threshold and if the number of beams used for transmission of the random access preamble with repetition is larger than the repetition threshold, UE 110 may select the second waveform, like CP-OFDM, for transmission of the connection request. For instance, if the number of beams for Msgl repetitions > Msgl beams repetitions thr, link budget may be assumed to be good enough. Thus, CP-OFDM may be used as an UL waveform for Msg3 transmission;
  • UE 110 may select the first waveform, like DFT-s-OFDM, for transmission of the connection request. For instance, if number of beams for Msgl repetition ⁇ Msgl beams repetitions thr, link budget may be assumed to be not good enough. Thus, DFT-s-OFDM may be used as an UL waveform for Msg3 transmission.
  • UE 110 may transmit a number of repetitions of the random access preamble, wherein the number is equal to the number of beams UE 110 is able to generate, with more beams associated to higher gains and hence to better link budget also during the transmission of the connection request.
  • the repetition threshold configured by wireless network node 120
  • the quantity of repetitions may refer to a number of repetitions as well.
  • UE 110 may ignore a transform precoder configured by wireless network node 120 for transmission of the connection request. For instance, UE 110 may ignore the content of the higher layer parameter msg3-transformPrecoder. UE 110 may then select the waveform for transmission of the connection request, like an UL waveform for the subsequent Msg3 transmission, as follows:
  • UE 110 may compare a number of repetitions used for transmission of the random access preamble with repetition to the repetition threshold and if the number of repetitions used for transmission of the random access preamble with repetition is larger than the repetition threshold, UE 110 may select the first waveform, like DFT- s-OFDM, for transmission of the connection request. For instance, if number of Msgl repetitions > Msgl number of repetitions thr, link budget may be assumed to be not good enough. Thus, DFT-s-OFDM may be used as an UL waveform for Msg3 transmission;
  • UE 110 may select the second waveform, like CP-OFDM, for transmission of the connection request. For instance, if number of Msgl repetitions ⁇ Msgl_number_of_repetitions_thr, link budget may be assumed to be good enough. Thus, CP-OFDM may be used as an UL waveform for Msg3 transmission.
  • UE 110 is not limited by its capability and is able to generate a number of beams with a certain beamforming gain, for example based on the measured SS-RSRP. This means that the larger the number of repetitions, the larger the number of beams, and the worse the channel conditions UE 110 is experiencing.
  • the repetition threshold configured by wireless network node 120
  • the quantity of repetitions may refer to a number of repetitions as well.
  • UE 110 may select the waveform for transmission of the connection request, like an UL waveform for the subsequent Msg3 transmission, as follows: • UE 110 may compare a number of repetitions used for transmission of the random access preamble with repetition to the repetition threshold and if the number of repetitions used for transmission of the random access preamble with repetition is larger than the repetition threshold, UE 110 may select the first waveform, like DFT- s-OFDM, for transmission of the connection request. For instance, if number of Msgl repetitions > Msgl number of repetitions thr, link budget may be assumed to be not good enough. Thus, DFT-s-OFDM may be used as an
  • UE 110 may select the second waveform, like CP-OFDM, for transmission of the connection request. For instance, if number of Msgl repetitions ⁇ Msgl number of repetitions thr, link budget may be assumed to be good enough. Thus, CP-OFDM may be used as an UL waveform for Msg3 transmission.
  • FIGURE 4 illustrates a signaling graph in accordance with at least some example embodiments. On the vertical axes are disposed, from the left to the right, UE 110 and wireless network node 120 of FIGURE 1. Time advances from the top towards the bottom.
  • wireless network node 120 may transmit a configuration configuring at least one repetition threshold, such a threshold associated with beams and/or number of repetitions (like Msgl beams repetitions thr and/or Msgl number of repetitions thr) to UE 110.
  • a configuration configuring at least one repetition threshold such a threshold associated with beams and/or number of repetitions (like Msgl beams repetitions thr and/or Msgl number of repetitions thr) to UE 110.
  • wireless network node 120 may transmit SSBs with different indices and configure UE 110, e.g., via SIB1 or higher layer configuration, like RRC.
  • UE 110 may select a waveform for transmission of a connection request, like Msg3 of a 4-step random access procedure.
  • the waveform may be selected by UE 110 based on a quantity of repetitions, like a number of beams or a number of repetitions, to be used for transmission of a random access preamble with repetition.
  • UE 110 may for example measure RSRP of the received SSBs and determine the best SSB beam. UE 110 may then determine the number of repetitions for transmitting a random access preamble, for example in a Msgl of the 4-step random access procedure. In some example embodiments, UE 110 may determine the number of Msgl repetitions based at least on its beam capability and/or on the measured RSRP. After that, UE 110 may select the waveform for transmission of the connection request based on the determined number of repetitions for transmitting the random access preamble. Said selection may be further based on one of the at least one repetition threshold.
  • UE 110 such as a CE UE, may select a first waveform, like DFT-s-OFDM, for transmission of the connection request, like Msgl.
  • UE 110 would be limited by its capability and not able to generate more than 2 beams with a limited beamforming gain.
  • UE 110 may select a second waveform, like CP-OFDM, for transmission of the connection request.
  • UE 110 may ignore a transform precoder parameter, like a higher layer parameters msg3-transformPrecoder, upon receiving the configuration at step 410.
  • the repetition threshold associated with a number of repetitions (Msgl number of repetitions thr) is 4, and UE 110 transmits the connection request with different transmit beams across 2 repetitions, link budget may be good enough and thus, UE 110 may select the second waveform for transmission of the connection request.
  • UE 110 may not be limited by its beamforming capability and UE 110 may be able to choose a number of beams (and hence antenna beamforming gain) based on the measured SS-RSRP. Hence, if the selected number of beams is low (2 in this case), it means that not much gain is necessary to satisfy the UL link budget.
  • UE 110 hence does not need to use a more robust waveform, like the first waveform, such as DFT-s-OFDM, for transmission of the connection request.
  • a more robust waveform like the first waveform, such as DFT-s-OFDM
  • link budget may be assumed to be not good enough and thus, UE 110 may select the second waveform, like CP- OFDM, for transmission of the connection request.
  • UE 110 may select the second waveform, like CP-OFDM, for transmission of the connection request.
  • UE 110 may ignore a transform precoder parameter, like a higher layer parameters msg3-transformPrecoder, upon receiving the configuration at step 410.
  • the repetition threshold associated with a number of repetitions (Msgl number of repetitions thr) is 4, and UE 110 transmits the connection request with a single, e.g., only one, transmit beam across 2 repetitions, link budget may be good enough and thus, UE 110 may select the second waveform for transmission of the connection request.
  • link budget may be assumed to be not good enough and thus, UE 110 may select the first waveform for transmission of the connection request
  • UE 110 may transmit a random access preamble with repetition to wireless network node 120.
  • UE 110 may transmit multiple repetitions of the random access preamble, e.g., repetitions of Msgl, with the same or different transmit beam configuration(s). That is, UE 110 may transmit Msgl (PRACH) repetitions with or without beam sweeping.
  • Wireless network node 120 may, upon receiving the random access preamble repetitions, schedule a transmission of the connection request. Wireless network node 120 may for example decode the Msgl and schedule a Msg3 transmission.
  • wireless network node 120 may transmit scheduling information to UE 110 for transmission of the connection request.
  • the connection request may be scheduled with, or without, repetitions.
  • Said scheduling information may be transmitted via an uplink grant and carried by a random access response, such as Msg2 of the 4-step random access procedure.
  • UE 110 may transmit the connection request using the selected waveform, possibly in accordance with said scheduling information.
  • Embodiments of the present invention therefore enable uplink waveform switching to a first waveform, like DFT-s-OFDM, based on at least one repetition threshold, wherein the at least one repetition threshold may comprise a number of repetitions and/or a number of beams employed for transmission of the random access preamble, like repetition of Msgl transmissions. Implicit uplink waveform switching for transmission of the connection request is hence enabled without additional dynamic signaling overhead. In addition, it is ensured that a robust waveform for transmission of the connection request can be selected when needed, for example based on the link budget expected to be experienced by UE 110 during transmissions of the random access preamble with repetition. In some example embodiments, the CE UE Msgl transmission characteristics may be used as an indicator for UL waveform determination for Msg3 transmission.
  • FIGURE 5 illustrates an example apparatus capable of supporting at least some example embodiments.
  • device 500 which may comprise, for example, UE 110 or wireless network node 120, or a control device configured to control the functioning thereof, possibly when installed therein.
  • processor 510 which may comprise, for example, a single- or multi-core processor wherein a single-core processor comprises one processing core and a multi-core processor comprises more than one processing core.
  • Processor 510 may comprise, in general, a control device.
  • Processor 510 may comprise more than one processor.
  • Processor 510 may be a control device.
  • a processing core may comprise, for example, a Cortex-A8 processing core manufactured by ARM Holdings or a Steamroller processing core produced by Advanced Micro Devices Corporation.
  • Processor 510 may comprise at least one Qualcomm Snapdragon and/or Intel Atom processor.
  • Processor 510 may comprise at least one application-specific integrated circuit, ASIC.
  • Processor 510 may comprise at least one field-programmable gate array, FPGA.
  • Processor 510 may be means for performing method steps in device 500.
  • Processor 510 may be configured, at least in part by computer instructions, to perform actions.
  • a processor may comprise circuitry, or be constituted as circuitry or circuitries, the circuitry or circuitries being configured to perform phases of methods in accordance with example embodiments described herein.
  • circuitry may refer to one or more or all of the following: (a) hardware-only circuit implementations, such as implementations in only analog and/or digital circuitry, and (b) combinations of hardware circuits and software, such as, as applicable: (i) a combination of analog and/or digital hardware circuit(s) with software/firmware and (ii) any portions of hardware processor(s) with software (including digital signal processor(s)), software, and memory(ies) that work together to cause an apparatus, such as a mobile phone or server, to perform various functions) and (c) hardware circuit(s) and or processor(s), such as a microprocessor(s) or a portion of a microprocessor(s), that requires software (e.g., firmware) for operation, but the software may not be present when it is not needed for operation.
  • firmware firmware
  • circuitry also covers an implementation of merely a hardware circuit or processor (or multiple processors) or portion of a hardware circuit or processor and its (or their) accompanying software and/or firmware.
  • circuitry also covers, for example and if applicable to the particular claim element, a baseband integrated circuit or processor integrated circuit for a mobile device or a similar integrated circuit in server, a cellular network device, or other computing or network device.
  • Device 500 may comprise memory 520.
  • Memory 520 may comprise randomaccess memory and/or permanent memory.
  • Memory 520 may comprise at least one RAM chip.
  • Memory 520 may comprise solid-state, magnetic, optical and/or holographic memory, for example.
  • Memory 520 may be at least in part accessible to processor 510.
  • Memory 520 may be at least in part comprised in processor 510.
  • Memory 520 may be means for storing information.
  • Memory 520 may comprise computer instructions that processor 510 is configured to execute. When computer instructions configured to cause processor 510 to perform certain actions are stored in memory 520, and device 500 overall is configured to run under the direction of processor 510 using computer instructions from memory 520, processor 510 and/or its at least one processing core may be considered to be configured to perform said certain actions.
  • Memory 520 may be at least in part comprised in processor 510.
  • Memory 520 may be at least in part external to device 500 but accessible to device 500.
  • Device 500 may comprise a transmitter 530.
  • Device 500 may comprise a receiver 540.
  • Transmitter 530 and receiver 540 may be configured to transmit and receive, respectively, information in accordance with at least one cellular or non-cellular standard.
  • Transmitter 530 may comprise more than one transmitter.
  • Receiver 540 may comprise more than one receiver.
  • Transmitter 530 and/or receiver 540 may be configured to operate in accordance with Global System for Mobile communication, GSM, Wideband Code Division Multiple Access, WCDMA, Long Term Evolution, LTE, and/or 5G/NR standards, for example.
  • Device 500 may comprise a Near-Field Communication, NFC, transceiver 550.
  • NFC transceiver 550 may support at least one NFC technology, such as Bluetooth, Wibree or similar technologies.
  • Device 500 may comprise User Interface, UI, 560.
  • UI 560 may comprise at least one of a display, a keyboard, a touchscreen, a vibrator arranged to signal to a user by causing device 500 to vibrate, a speaker and a microphone.
  • a user may be able to operate device 500 via UI 560, for example to accept incoming telephone calls, to originate telephone calls or video calls, to browse the Internet, to manage digital files stored in memory 520 or on a cloud accessible via transmitter 530 and receiver 540, or via NFC transceiver 550, and/or to play games.
  • Device 500 may comprise or be arranged to accept a user identity module 570.
  • User identity module 570 may comprise, for example, a Subscriber Identity Module, SIM, card installable in device 500.
  • a user identity module 570 may comprise information identifying a subscription of a user of device 500.
  • a user identity module 570 may comprise cryptographic information usable to verify the identity of a user of device 500 and/or to facilitate encryption of communicated information and billing of the user of device 500 for communication effected via device 500.
  • Processor 510 may be furnished with a transmitter arranged to output information from processor 510, via electrical leads internal to device 500, to other devices comprised in device 500.
  • a transmitter may comprise a serial bus transmitter arranged to, for example, output information via at least one electrical lead to memory 520 for storage therein.
  • the transmitter may comprise a parallel bus transmitter.
  • processor 510 may comprise a receiver arranged to receive information in processor 510, via electrical leads internal to device 500, from other devices comprised in device 500.
  • Such a receiver may comprise a serial bus receiver arranged to, for example, receive information via at least one electrical lead from receiver 540 for processing in processor 510.
  • the receiver may comprise a parallel bus receiver.
  • Device 500 may comprise further devices not illustrated in FIGURE 5.
  • device 500 may comprise at least one digital camera.
  • Some devices 500 may comprise a back-facing camera and a front-facing camera, wherein the back-facing camera may be intended for digital photography and the frontfacing camera for video telephony.
  • Device 500 may comprise a fingerprint sensor arranged to authenticate, at least in part, a user of device 500.
  • device 500 lacks at least one device described above.
  • some devices 500 may lack a NFC transceiver 550 and/or user identity module 570.
  • Processor 510, memory 520, transmitter 530, receiver 540, NFC transceiver 550, UI 560 and/or user identity module 570 may be interconnected by electrical leads internal to device 500 in a multitude of different ways.
  • each of the aforementioned devices may be separately connected to a master bus internal to device 500, to allow for the devices to exchange information.
  • this is only one example and depending on the example embodiment, various ways of interconnecting at least two of the aforementioned devices may be selected without departing from the scope of the example embodiments.
  • FIGURE 6 is a flow graph of a first method in accordance with at least some example embodiments.
  • the apparatus of the first method may be UE 110 or a control device configured to control the functioning thereof, possibly when installed therein. That is, the steps of the first method may be performed by UE 110 or by a control device configured to control the functioning thereof, possibly when installed therein.
  • the first method may comprise, at step 610, transmitting by an apparatus, to a wireless network node, a random access preamble with repetition using a quantity of repetitions.
  • the first method may also comprise, at step 620, selecting by the apparatus, based on said quantity of repetitions and one of at least one repetition threshold, a waveform for transmission of a connection request.
  • the first method may comprise, at step 630, transmitting by the apparatus, to the wireless network node, the connection request using the selected waveform.
  • an apparatus such as, for example, UE 110 or wireless network node 120, may comprise means for carrying out the example embodiments described above and any combination thereof.
  • a computer program may be configured to cause a method in accordance with the example embodiments described above and any combination thereof.
  • a computer program product embodied on a non-transitory computer readable medium, may be configured to control a processor to perform a process comprising the example embodiments described above and any combination thereof.
  • an apparatus such as, for example, UE 110 or wireless network node 120, may comprise at least one processor, and at least one memory including computer program code, wherein the at least one memory and the computer program code are configured to, with the at least one processor, cause the apparatus at least to perform the example embodiments described above and any combination thereof.
  • At least some example embodiments find industrial application in cellular communication networks, for example in 3 GPP networks.

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

Abstract

Selon un aspect donné à titre d'exemple de la présente divulgation, est divulgué un appareil comprenant des moyens pour transmettre, à un nœud de réseau sans fil, un préambule d'accès aléatoire avec répétition au moyen d'une quantité de répétitions, des moyens pour sélectionner, sur la base de ladite quantité de répétitions et de l'un d'au moins un seuil de répétition, une forme d'onde pour la transmission d'une demande de connexion et des moyens pour transmettre, au nœud de réseau sans fil, la demande de connexion au moyen de la forme d'onde sélectionnée.
PCT/EP2023/067062 2022-09-28 2023-06-23 Accès aléatoire amélioré dans des réseaux de communication cellulaire WO2024068059A1 (fr)

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WO2018085701A1 (fr) * 2016-11-04 2018-05-11 Intel IP Corporation Transmission de message 3 dans une procédure d'accès aléatoire destinée à un réseau radio
US20180279361A1 (en) * 2017-03-23 2018-09-27 Samsung Electronics Co., Ltd. Apparatus and method for performing initial access in wireless communication system
US20210058971A1 (en) * 2019-08-19 2021-02-25 Samsung Electronics Co., Ltd. Repetition of prach preamble transmission for ues
US20210266974A1 (en) * 2020-02-21 2021-08-26 Qualcomm Incorporated Physical random access channel repetition and receive-beam sweep and associated beam refinement
WO2022133357A1 (fr) * 2020-12-18 2022-06-23 Ofinno, Llc Identifiant d'accès aléatoire pour dispositif à capacité réduite

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WO2018085701A1 (fr) * 2016-11-04 2018-05-11 Intel IP Corporation Transmission de message 3 dans une procédure d'accès aléatoire destinée à un réseau radio
US20180279361A1 (en) * 2017-03-23 2018-09-27 Samsung Electronics Co., Ltd. Apparatus and method for performing initial access in wireless communication system
US20210058971A1 (en) * 2019-08-19 2021-02-25 Samsung Electronics Co., Ltd. Repetition of prach preamble transmission for ues
US20210266974A1 (en) * 2020-02-21 2021-08-26 Qualcomm Incorporated Physical random access channel repetition and receive-beam sweep and associated beam refinement
WO2022133357A1 (fr) * 2020-12-18 2022-06-23 Ofinno, Llc Identifiant d'accès aléatoire pour dispositif à capacité réduite

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