WO2016048798A1 - Configuration d'écoute avant de parler pour un scénario multi-opérateurs - Google Patents

Configuration d'écoute avant de parler pour un scénario multi-opérateurs Download PDF

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Publication number
WO2016048798A1
WO2016048798A1 PCT/US2015/050768 US2015050768W WO2016048798A1 WO 2016048798 A1 WO2016048798 A1 WO 2016048798A1 US 2015050768 W US2015050768 W US 2015050768W WO 2016048798 A1 WO2016048798 A1 WO 2016048798A1
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WIPO (PCT)
Prior art keywords
clear channel
channel assessment
slot
computer program
processor
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PCT/US2015/050768
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English (en)
Inventor
Esa Tiirola
Timo Lunttila
Kari Hooli
Klaus Hugl
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Nokia Technologies Oy
Nokia Usa Inc.
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Publication of WO2016048798A1 publication Critical patent/WO2016048798A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
    • H04W74/0816—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA] with collision avoidance
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/14—Spectrum sharing arrangements between different networks

Definitions

  • LBT listen before talk
  • LTE- Advanced long term evolution advanced
  • LAA LTE Licensed Assisted Access
  • EN 301 893 defines European regulatory requirements unlicensed band on 5GHz band.
  • EN 301 893 is hereby incorporated herein by reference in its entirety.
  • EN 301 893 defines two types of operation modes: (1) Frame Based Equipment (FBE) and (2) Load Based Equipment (LBE).
  • Frame based equipment is the equipment where the transmit/receive structure is not directly demand-driven but has fixed timing.
  • a listen before talk (LBT) procedure for FBE and/or LBE may, for example, be based on European regulatory rules defined for 5 GHz ISM band.
  • LBT listen before talk
  • the transmit/receive structure is not fixed in time but demand- driven. If the load based equipment finds an operating channel occupied (through some LBT/CCA procedure), it conventionally shall not transmit in that channel. Conventionally, the equipment shall then perform an Extended CCA check, in which the Operating Channel(s) is/are observed for the duration of a random factor N multiplied by the CCA observation time.
  • N defines the number of clear idle slots resulting in a total Idle Period that need to be observed before initiation of the transmission.
  • the value of N shall be randomly selected in the range l..q every time an Extended CCA is required.
  • the value may be stored in a counter. The counter is decremented every time a CCA slot is considered to be unoccupied.
  • the equipment may transmit.
  • the value of q may be selected by the manufacturer in the range 4..32.
  • the total time that an equipment makes use of an Operating Channel is the Maximum Channel Occupancy which shall be less than (13/32) x q ms, after which the device shall perform the Extended CCA.
  • Synchronizing CCA timing between neighboring nodes poses certain challenges.
  • ETSI Rules present an approach for equipment following regulatory rules for load based equipment in terms of the eCC A operation. However, that approach does not appear fully to support coordinated operation (frequency reuse- 1) within one operator, as each equipment would select randomly the extended CCA duration parameter N.
  • LTE License Assisted Access enables carrier aggregation using one or multiple unlicensed band LTE SCell(s) with a licensed band PCell and thereby increase the potential UE and system throughput.
  • LBT Listen-bef ore-talk
  • a method can include providing multiple clear channel assessment slots at an end of an idle period. The method can also include assigning a clear channel assessment pattern for each cell of a plurality of cells.
  • the clear channel assessment pattern comprises a CCA slot number to indicate in which CCA slot to perform clear channel assessment.
  • the clear channel assessment pattern comprises a counter value.
  • the assigning includes generating the clear channel assessment pattern with a pseudo-random generator.
  • the assigning is performed in dependence on at least one of a public land mobile network identifier (PLMN ID), a subframe number, or a slot number.
  • PLMN ID public land mobile network identifier
  • subframe number a subframe number
  • slot number a slot number
  • multiple clear channel assessment slots can each have a clear channel assessment slot length equal to an orthogonal frequency division multiple access symbol.
  • multiple clear channel assessment slots can each have a clear channel assessment slot length equal to a fraction of an orthogonal frequency division multiple access symbol.
  • a method can include performing clear channel assessment before starting data transmitting.
  • the method can also include conditionally transmitting data based on a result of the clear channel assessment and a clear channel assessment pattern.
  • the method includes monitoring the CCA slot to determine whether the channel is unoccupied.
  • the method includes transmitting data from the beginning of the frame period when the clear channel assessment indicates that the channel is unoccupied.
  • the method includes when the clear channel assessment indicates that the channel is unoccupied, transmitting a reservation signal from the beginning of next CCA slot until the end of the idle period.
  • the method includes transmitting data immediately when the clear channel assessment indicates that the channel is unoccupied.
  • the method includes decrementing a counter when a value of the counter is greater than zero and the clear channel assessment indicates that the channel is unoccupied.
  • the method includes transmitting data when the counter is equal to zero.
  • multiple clear channel assessment slots can each have a clear channel assessment slot length equal to an orthogonal frequency division multiple access symbol.
  • multiple clear channel assessment slots can each have a clear channel assessment slot length equal to a fraction of an orthogonal frequency division multiple access symbol.
  • the clear channel assessment pattern comprises a counter value.
  • the assigning includes generating the clear channel assessment pattern with a pseudo-random generator.
  • the assigning is performed in dependence on at least one of a public land mobile network identifier (PLMN ID), a subframe number, or a slot number.
  • PLMN ID public land mobile network identifier
  • subframe number a subframe number
  • slot number a slot number
  • the clear channel assessment pattern can indicate to a given network node a pseudo-random factor N, upon starting the extended clear channel assessment procedure.
  • a counter for N can be reset with a pseudo-random clear channel assessment pattern value at predefined time instances, regardless of an enhanced clear channel assessment procedure state.
  • the counter reset time instances can be predetermined by standard or configurable.
  • the resetting frequency may adapt to the current interference or load situation.
  • the counter resetting may also be enabled or disabled.
  • the counter resetting can be enabled or disabled based on current interference or load situation.
  • resetting of counter N value may be dynamically triggered.
  • the dynamic trigger can be provided by DCI used for UL scheduling.
  • an apparatus can include means for performing the method of the first or second embodiment in any of their variants, respectively.
  • an apparatus can include at least one processor and at least one memory including computer program code.
  • the at least one memory and the computer program code can be configured to, with the at least one processor, cause the apparatus at least to perform the method according to the first or second embodiment in any of their variants, respectively.
  • a non-transitory computer-readable medium can, in seventh and eighth embodiments, be encoded with instructions that, when executed in hardware, perform a process.
  • the process can include the method according to the first or second embodiment in any of their variants, respectively.
  • a computer program product in ninth and tenth embodiments, can encode instructions for performing a process.
  • the process can include the method according to the first or second embodiment in any of their variants, respectively.
  • Figure 1 illustrates a scenario according to certain embodiments for frame based equipment.
  • Figure 2 illustrates a method according to certain embodiments.
  • Figure 3 illustrates the principle of the CCA slot arrangement with FBE and DL scenario, according to certain embodiments.
  • Figure 4 illustrates a system according to certain embodiments.
  • Certain embodiments relate to a way how to facilitate Listen Before Talk (LBT) and related Clear Channel Assessment (CCA) procedures in a LTE LAA scenario with multiple operators and synchronized network.
  • the logic behind the scenario includes that in a typical LTE LAA scenario, multiple operators share the same unlicensed spectrum.
  • An assumption made here is that the network is synchronized. This is a typical assumption in time division duplex (TDD) deployments in general and a prerequisite for effective interference management. Also, in FDD deployments, more and more synchronized network operation is used to enable enhanced LTE features as intercell interference coordination, enhanced UE receivers, and the like.
  • the synchronization assumption covers both intra-operator and inter-operator cases here. Another possible scenario is such where synchronization assumption covers only intra-operator case but not inter-operator case.
  • Certain embodiments provide a way to facilitate Listen Before Talk (LBT) in, for example, an LAA scenario with multiple operators and a synchronized network.
  • LBT Listen Before Talk
  • the considered scenario is depicted in the Figure 1 for frame based equipment (FBE) according to the EU/ETSI regulations.
  • FBE frame based equipment
  • DL downlink subframe/symbol timing is aligned between neighbouring cells. This assumption may apply both to frame based equipment (FBE) as well as to load based equipment (LBE).
  • Figure 1 illustrates a scenario according to certain embodiments for frame based equipment.
  • the frame period includes the Channel Occupancy time (i.e. the transmission) and an idle period.
  • the idle period may be, for example, about 1 ms out of the 10 ms or less.
  • Certain embodiments define a CCA arrangement for LTE LAA scenario with multiple operators and synchronized network operating according to the regulations defined for either FBE or
  • FIG. 2 illustrates a method according to certain embodiments.
  • the method can include providing multiple CCA slots at the end of an idle period.
  • Each CCA slot can have a predefined time duration, T cca .
  • T cca can be, for example, 18 or 20 ⁇ .
  • CCA slots may be numbered. For example, they can be numbered as ... , 6, 5, 4, 3, 2, 1, 0.
  • Figure 3 provides an illustration of such numbering.
  • the method can include assigning a CCA pattern for each cell.
  • the CCA pattern can be made up of pseudo-random numbers.
  • the pattern may be derived based on various input parameters such as cell_id, subframe number, radio frame number, service provider id (operator_id), or the like.
  • the CCA Pattern can be defined for each cell, for example on a per-cell basis.
  • Frequency reuse- 1 can be realized by assigning the same CCA Pattern for multiple cells, which might make sense for multiple cells of a single operator.
  • LBT among cells can be realized by assigning distinct CCA patterns for each of the multiple cells, for example for different operators.
  • a separate CCA Pattern can be defined for each of the uplink and downlink operations in the cell.
  • all UEs in a certain cell can utilize the same CCA pattern for their uplink operation.
  • the uplink CCA Patterns can be cell specific but not UE specific.
  • the CCA pattern can indicate the CCA slot in which the given network node is to perform CCA.
  • the CCA slot indicated by the CCA Pattern can vary from one idle period to another in a pseudo-random manner.
  • the CCA pattern can indicate to the given network node the (pseudo) random factor N, upon starting the extended CCA procedure.
  • the counter for N can be reset with the pseudo-random CCA pattern value at predefined time instances, regardless of the eCCA procedure state.
  • a network node Before starting transmission, at 230 a network node can perform CCA LBT.
  • Network node here can broadly refer to such devices as an eNB or UE. If the network node finds the operating channel occupied, at 232 the network node can avoid transmitting on that channel immediately. If the network node finds the operating channel unoccupied, it may, at 234, attempt to occupy the channel according to the following procedures.
  • a reservation signal may be used to occupy the channel until the start of the next LTE subframe, at 240, to align the LBE transmission with the symbol/subframe grid of LTE (for example with the symbol and subframe timing of the licensed band LTE PCell) in a predetermined way of the intended synchronized network operation.
  • the node can start transmitting data when the extended CCA procedure has determined the channel to be available for transmission. For example, in LBE the node can start transmitting after the node has observed the channel to be unoccupied N times.
  • a pseudo-random CCA pattern can determine the initial value of N. If the eCCA procedure determines the channel to be free, N can be decremented by one, otherwise N can stay the same. When N reaches zero, namely the channel has been found to be unoccupied N times, the node may transmit.
  • a reservation signal can be used to align the LBE transmission with the symbol/subframe grid in a predetermined way of the intended synchronized network operation.
  • the node can start transmitting a reservation signal until the beginning of the (fixed) frame period.
  • the node can start transmitting data from the beginning of the (fixed) frame period when the CCA slot monitored is the last CCA slot within the idle period, such as CCA slot #0 in Figure 3.
  • the node can start transmitting data from the beginning of the frame period. Otherwise, the node can start transmitting a reservation signal as soon as it can start the transmission taking into account time required for Rx-Tx switching.
  • a channel reservation signal can be transmitted until beginning of the (fixed) frame period and the UE can start transmitting data after that.
  • Figure 3 illustrates the principle of the clear channel assessment (CCA) slot arrangement with FBE and DL scenario, according to certain embodiments. As shown in Figure 3, there can be at least four cells (Cell A, Cell B, Cell C, and Cell D). There can be an idle period between a previous channel occupancy and a next channel occupancy, i.e. the next frame boundary.
  • CCA clear channel assessment
  • Cell A can conduct CCA, followed by reservation signals in CCA slots 2, 1, and 0 if the channel was found unoccupied in the CCA.
  • Cell B can conduct CCA in CCA slot 2, followed by reservation signals in CCA slots 1 and 0.
  • Cell C can conduct CCA in CCA slot 1, followed by a reservation signal in CCA slot 1.
  • Cell D can simply conduct CCA in CCA slot 0.
  • Figure 3 depicts a DL scenario in which different network nodes can correspond to different eNBs.
  • Each network node can be given a CCA pattern, which can indicate a CCA slot for each idle period in the range of 0...(F-1), where Y equals the number of CCA slots configured.
  • the relative index of the CCA slot can essentially indicate a current cell priority when compared to other neighboring cells when reserving the channel. For example, nodes with earlier CCA slots effectively have higher priority when accessing the spectrum. In the example of Figure 3, Cell A is most likely to gain access to spectrum.
  • eNBs of the same operator may have the same priority.
  • Such an implementation can allow frequency reuse- 1 type operation within an operator.
  • the CCA slot allocation and the priority can change deterministically from one LBT occasion/idle period to another. The change can be made, for example, in a pseudo-random manner so that network operators are more or less equally happy or unhappy. This approach can, at the same time, help to prevent unnecessary collisions of a fully synchronized multi-operator FBE scenario.
  • each network node can be given a CCA pattern. Based on the CCA pattern, the network node can determine the value of N that the UE should assume in an extended CCA procedure.
  • the pattern can be used in initializing the value of N. Moreover, the pattern can result in N being time dependent and varying.
  • the values of N can be uniformly distributed over a range l ..q, where q is defined as described above.
  • the same parameter value q may be selected for multiple nodes in the network. This may be beneficial at least in the case when different nodes are configured with the same CCA pattern.
  • the pattern may be PMLN specific, such as a function of the PLMN ID.
  • the pattern may be cells specific, such as a function of the cell ID, potentially in combination with the PLMN ID.
  • the pattern for UL operation may also or alternatively be PMLN specific.
  • the CCA pattern may be generated with a pseudo-random generator at each network node.
  • the pseudo-random generator can be initialized according to the assigned CCA pattern.
  • the pseudo-random generator initialization may depend on PLMN ID and a time instance, such as subframe number or slot number.
  • the equipment Before a transmission or a burst of transmissions on an operating channel, the equipment can perform a Clear Channel Assessment (CCA) check using energy detect. If the equipment finds the Operating Channel(s) to be clear, the equipment may transmit immediately.
  • the equipment can perform an extended CCA check. For example, the equipment can continue monitoring operating the channel, until the channel becomes unoccupied. A counter can be decremented every time a CCA slot is considered to be unoccupied. When the counter reaches zero, the equipment may transmit.
  • Network elements may see different interference levels and, hence, have different interpretations whether a particular CCA slot is occupied or not, based on an energy detection approach to determining occupancy.
  • counters for N on different network elements may be decremented at a different pace, although initialized with the same CCA pattern value. Differences in
  • N counter value means that network element would start transmission at different time instances, and the network element first to transmit would block transmission from other network elements. Reuse- 1 between cells or FDMed UL may not be achieved in that case.
  • the counter for N can be reset with the pseudo- random CCA pattern value at predefined time instances, regardless of the eCCA procedure state.
  • the counter reset time instances may be predetermined by standard or configurable.
  • the resetting frequency may adapt to the current interference or load situation.
  • the counter resetting may also be enabled or disabled. This may be done based on current interference or load situation for example.
  • resetting of counter N value may be dynamically triggered, for example with DCI used for UL scheduling.
  • an eNB's reservation signal can be counted as part of the channel occupancy time when defining the LTE LAA frame length. This approach may ensure that the minimum Idle Period is at least 5 % of the Channel Occupancy Time used by the equipment for the current Fixed Frame Period.
  • Channel reservation signals for FBE and LBE can implemented in at least two ways.
  • a CCA slot length can equal one OFDMA symbol.
  • the CCA slot length including Rx-Tx time can be defined to be one OFDMA symbol.
  • existing signals can be used as reservation signals.
  • current LTE signals such as CRS can be used as a reservation signal.
  • CCA slot length can equal a fraction of an OFDMA symbol.
  • the eNB may support transmission of reservation signal outside the regular symbol grid.
  • one way is frequency domain generation of the signal, for example based on pre-calculated sequences. Those sequences can be configured to have a desired time domain behavior.
  • CAZAC autocorrelation
  • the duration of CCA slot (T cca ) including Rx-Tx time can be defined to be TJN, where T s the duration of an OFDMA symbol and N is a positive integer, N £ ⁇ 1 ,2,3, ... ⁇ .
  • T s the duration of an OFDMA symbol
  • N is a positive integer, N £ ⁇ 1 ,2,3, ... ⁇ .
  • X2 signalling can be used to facilitate the desired coordination between eNBs.
  • the coordination may be desired in the following areas. For FBE only, alignment of CCA slots between different operators for frame based equipment may be desired. This may include duration of a CCA slot (T cca ) or the number of CCA slots (Y).
  • T cca duration of a CCA slot
  • Y number of CCA slots
  • X2 signaling can be used to facilitate similar or different random selection /CCA pattern within one operator's network.
  • FIG. 4 illustrates a system according to certain embodiments of the invention. It should be understood that each block of the flowchart of Figure 2 may be implemented by various means or their combinations, such as hardware, software, firmware, one or more processors and/or circuitry.
  • a system may include several devices, such as, for example, network element 410 and user equipment (UE) or user device 420.
  • the system may include more than one UE 420 and more than one network element 410, although only one of each is shown for the purposes of illustration.
  • a network element can be an access point, a base station, an eNode B (eNB), or any other network element.
  • Each of these devices may include at least one processor or control unit or module, respectively indicated as 414 and 424.
  • At least one memory may be provided in each device, and indicated as 415 and 425, respectively.
  • the memory may include computer program instructions or computer code contained therein.
  • One or more transceiver 416 and 426 may be provided, and each device may also include an antenna, respectively illustrated as 417 and 427. Although only one antenna each is shown, many antennas and multiple antenna elements may be provided to each of the devices. For example, a two-dimensional array of antenna elements may be used by network element 410. Other configurations of these devices, for example, may be provided.
  • network element 410 and UE 420 may be additionally configured for wired communication, in addition to wireless communication, and in such a case antennas 417 and 427 may illustrate any form of communication hardware, without being limited to merely an antenna.
  • Transceivers 416 and 426 may each, independently, be a transmitter, a receiver, or both a transmitter and a receiver, or a unit or device that may be configured both for transmission and reception.
  • the transmitter and/or receiver (as far as radio parts are concerned) may also be implemented as a remote radio head which is not located in the device itself, but in a mast, for example.
  • the operations and functionalities may be performed in different entities, such as nodes, hosts or servers, in a flexible manner. In other words, division of labor may vary case by case.
  • One possible use is to make a network element to deliver local content.
  • One or more functionalities may also be implemented as a virtual application that is as software that can run on a server.
  • a user device or user equipment 420 may be a mobile station (MS) such as a mobile phone or smart phone or multimedia device, a computer, such as a tablet, provided with wireless communication capabilities, personal data or digital assistant (PDA) provided with wireless communication capabilities, portable media player, digital camera, pocket video camera, navigation unit provided with wireless communication capabilities or any combinations thereof.
  • MS mobile station
  • PDA personal data or digital assistant
  • the user device or user equipment 420 may be a sensor or smart meter, or other device that may usually be configured for a single location.
  • an apparatus such as a node or user device, may include means for carrying out embodiments described above in relation to Figure 2.
  • Processors 414 and 424 may be embodied by any computational or data processing device, such as a central processing unit (CPU), digital signal processor (DSP), application specific integrated circuit (ASIC), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), digitally enhanced circuits, or comparable device or a combination thereof.
  • the processors may be implemented as a single controller, or a plurality of controllers or processors. Additionally, the processors may be implemented as a pool of processors in a local configuration, in a cloud configuration, or in a combination thereof.
  • the implementation may include modules or unit of at least one chip set (e.g., procedures, functions, and so on).
  • Memories 415 and 425 may independently be any suitable storage device, such as a non-transitory computer-readable medium.
  • a hard disk drive (HDD), random access memory (RAM), flash memory, or other suitable memory may be used.
  • the memories may be combined on a single integrated circuit as the processor, or may be separate therefrom.
  • the computer program instructions may be stored in the memory and which may be processed by the processors can be any suitable form of computer program code, for example, a compiled or interpreted computer program written in any suitable programming language.
  • the memory or data storage entity is typically internal but may also be external or a combination thereof, such as in the case when additional memory capacity is obtained from a service provider.
  • the memory may be fixed or removable.
  • the memory and the computer program instructions may be configured, with the processor for the particular device, to cause a hardware apparatus such as network element 410 and/or UE 420, to perform any of the processes described above (see, for example, Figure 2).
  • a non-transitory computer-readable medium may be encoded with computer instructions or one or more computer program (such as added or updated software routine, applet or macro) that, when executed in hardware, may perform a process such as one of the processes described herein.
  • Computer programs may be coded by a programming language, which may be a high-level programming language, such as objective-C, C, C++, C#, Java, etc., or a low-level programming language, such as a machine language, or assembler.
  • a programming language which may be a high-level programming language, such as objective-C, C, C++, C#, Java, etc.
  • a low-level programming language such as a machine language, or assembler.
  • certain embodiments of the invention may be performed entirely in hardware.
  • Figure 4 illustrates a system including a network element 410 and a UE 420
  • embodiments of the invention may be applicable to other configurations, and configurations involving additional elements, as illustrated and discussed herein.
  • multiple user equipment devices and multiple network elements may be present, or other nodes providing similar functionality, such as nodes that combine the functionality of a user equipment and an access point, such as a relay node.
  • Certain embodiments may have various advantages and/or benefits. For example, certain embodiments may provide maximum scalability with small overhead. Furthermore, in certain embodiments there may be no extra signaling required between different operators. Additionally, certain embodiments may provide the possibility of coordinated operation ("Reuse- 1") within one operator. Also, certain embodiments may provide fair interference avoidance between different operators.
  • Certain embodiments may be applicable for both frame based equipment as well as load based equipment and may be equally applicable for DL and UL operation. Additionally, certain embodiments may facilitate frequency domain multiplexing of multiple UEs in the case of UL operation.
  • LBT listen before talk
  • An LBT solution applicable to LAA for example including both multi-operator LTE and WiFi, may be useful for those scenarios. Nevertheless, it should be understood that those other scenarios are not excluded. Thus, the above illustrations can also be applied, in certain embodiments, to non-LAA situations, such as other co-existence scenarios.
  • LSA Licensed Shared Access
  • 3GPP 3GPP
  • Co-primary sharing is another example.
  • Co-primary sharing refers to spectrum sharing where several primary users or operators share the spectrum dynamically or semi-statically. Suitable spectrum, for example for small cells, may exist at 3.5 GHz. Spectrum sharing between operators may happen if regulators enforce it and/or operators need it.
  • WI tar geting to flexible UL/DL adaptation for TD-LTE
  • eNB enhanced or evolved Node B base station according to LTE terminology
  • X2 X2 is an interface used to communication between eNBs

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Abstract

Selon l'invention, certains systèmes de communication peuvent bénéficier de configurations d'écoute avant de parler (LBT). Par exemple, un système d'évolution à long terme avancé (LTE-avancé) et particulièrement, un système d'évolution à long terme (LTE) déployé sur des bandes non autorisées (accès assisté par licence LTE, LTE LAA) peuvent bénéficier d'une configuration LBT pour un scénario multi-opérateurs. Un procédé peut consister à fournir de multiples créneaux d'évaluation de canal libre à une fin d'une période de repos. Le procédé peut également consister à affecter un modèle d'évaluation de canal libre pour chaque cellule d'une pluralité de cellules.
PCT/US2015/050768 2014-09-25 2015-09-17 Configuration d'écoute avant de parler pour un scénario multi-opérateurs WO2016048798A1 (fr)

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WO2020023475A1 (fr) * 2018-07-25 2020-01-30 Qualcomm Incorporated Structure de spectre partagé multi-opérateur, compatible avec un équipement basé sur la trame
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US11716758B2 (en) 2020-02-07 2023-08-01 Qualcomm Incorporated Receiver assisted transmitter sensing for channel access

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