WO2019193123A1 - Sélection de séquence de signature d'accès multiple non orthogonal - Google Patents

Sélection de séquence de signature d'accès multiple non orthogonal Download PDF

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Publication number
WO2019193123A1
WO2019193123A1 PCT/EP2019/058566 EP2019058566W WO2019193123A1 WO 2019193123 A1 WO2019193123 A1 WO 2019193123A1 EP 2019058566 W EP2019058566 W EP 2019058566W WO 2019193123 A1 WO2019193123 A1 WO 2019193123A1
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WO
WIPO (PCT)
Prior art keywords
network node
parameter
wds
sequence
processing circuitry
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Application number
PCT/EP2019/058566
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English (en)
Inventor
Andres Reial
Ali Behravan
Krishna CHITTI
Robert Mark Harrison
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Telefonaktiebolaget Lm Ericsson (Publ)
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Application filed by Telefonaktiebolaget Lm Ericsson (Publ) filed Critical Telefonaktiebolaget Lm Ericsson (Publ)
Publication of WO2019193123A1 publication Critical patent/WO2019193123A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/16—Code allocation

Definitions

  • the present disclosure relates to wireless communications, and in particular, to non- orthogonal signature sequence selection.
  • signal transmission to or from multiple wireless devices (WDs) in a cellular network (NW) is preferably done by ensuring, or at least attempting to ensure, orthogonality of the transmitted signals (conventional orthogonal multiple access, COMA) via orthogonal time, frequency, or spatial allocation of the transmitted signal resources.
  • WDs wireless devices
  • NW cellular network
  • orthogonality is the aim of receiver procedures, using equalizers, IRC and other minimum mean square error (MMSE)-like receivers, for example, Orthogonal Frequency Division Multiplex (OFDM) or multiple input/multiple output (MIMO) transmission, but also non-linear variants of such receivers.
  • MMSE minimum mean square error
  • the NW prioritizes the ability to handle a larger number of WDs over given resources than would be allowed according to the COMA approach, e.g., when the available degrees of freedom (DoFs) are fewer than the number of users to be served.
  • DoFs degrees of freedom
  • Multiple users can then be scheduled in the same resources, according to a non-orthogonal multiple access (NOMA) approach, with the inherent realization that the WDs’ signals will not be substantially orthogonal at the receiver. Rather, there will exist residual inter-user interference that needs to be handled by the receiver.
  • NOMA non-orthogonal multiple access
  • SS WD-specific signature sequences
  • each WD spreads its quadrature amplitude modulation (QAM) information symbols using an N-length spreading sequence ⁇ s k ⁇ .
  • Fet K denote the number of simultaneously active WDs.
  • the received signal vector y £ C N where N is the number of resource elements (REs) spanned by the signature vectors and carry the same QAM information symbols, at the evolved nodeB base station (eNB) or New Radio (NR) base station (gNB) can be written as:
  • h k is the channel vector between WD k and the gNB
  • x k is the QAM symbol of WD k
  • O stands for the pointwise multiplication/product of two vectors.
  • RX receive
  • the QAM symbols are spread using sequences that are designed to have certain desired correlation properties. The differences between various schemes lie in how the signature sequences ⁇ s k ⁇
  • transmitter (TX) and the (receiver) RX e.g., the WD and the NW respectively in a cellular NW uplink (UL), e.g., from the WD to the network node, use case, are aware of the signatures used and/or their relevant properties.
  • NW NW uplink
  • One way to achieve this is for the NW to inform each WD about the SS it should use, or provide other sufficient information for the WD to determine a suitable SS.
  • NOMA may then be used to accommodate more WDs in the given resources.
  • an SS set with certain properties may be predefined to
  • the sequences may then be assigned to the WDs, to be utilized whenever they need to operate in the NOMA mode.
  • a single fixed SS set is generally not guaranteed to result in efficient or optimal performance in widely varying scenarios and conditions.
  • the performance parameters of SS designs like inter-sequence isolation, spreading factor, the number of simultaneously supported users, transmission latency, etc., cannot generally be controlled in a disjoint manner. Optimizing an SS design for one of the parameters may lead to undesired effects regarding other parameters.
  • a method is implemented in a network node, the method including determining signature sequence (SS) parameters based on operating conditions.
  • the method also includes assigning respective SSs to multiple WDs, the SSs being based on the SS parameters.
  • the method also includes signaling to each WD an indication of its assigned SS.
  • a network node configured to communicate with wireless devices, WDs, using sequence-spreading.
  • the network node comprises processing circuitry, the processing circuitry configured to determine at least one signature sequence, SS, parameter based at least in part on a number of WDs to be served by the network node using the sequence-spreading, the at least one SS parameter comprising an SS length and an overloading factor.
  • the processing circuitry is further configured to assign an SS to at least one of the WDs, the SS being based at least in part on the at least one SS parameter.
  • the processing circuitry is further configured to signal to the at least one of the WDs an indication of the assigned SS.
  • the overloading factor indicates how many more WDs are permitted to be served by the network node using the sequence-spreading than are permitted using orthogonal multiple access, OMA.
  • the use of sequence-spreading corresponds to non-orthogonal multiple access, NOMA.
  • the processing circuitry is further configured to assign a respective SS to each of the WDs, each SS being based at least in part on the at least one SS parameter; and signal to each of the WDs an indication of the respective assigned SS.
  • the processing circuitry is further configured to determine the at least one SS parameter by being configured to determine the at least one SS parameter further based at least in part on a signal-to -noise ratio. In some embodiments of this aspect, the processing circuitry is further configured to determine the at least one SS parameter by being configured to determine the at least one SS parameter further based at least in part on a transport block size, TBS. In some embodiments of this aspect, the processing circuitry is further configured to determine the at least one SS parameter by being configured to determine the at least one SS parameter further based at least in part on a latency requirement. In some embodiments of this aspect, the at least one SS parameter further comprises at least one of a number of available sequences and inter sequence properties.
  • the processing circuitry is further configured to select the SS from a lookup table based on the determined at least one SS parameter. In some embodiments of this aspect, the processing circuitry is further configured to receive a signal from the at least one of the WDs and demodulate the signal using the assigned SS.
  • a method in a network node using sequence-spreading for wireless communications comprises determining at least one signature sequence, SS, parameter based at least in part on a number of wireless devices, WDs, to be served by the network node using the sequence-spreading, the at least one SS parameter comprising an SS length and an overloading factor.
  • the method further comprises assigning a SS to at least one of the WDs, the SS being based at least in part on the at least one SS parameter.
  • the method further comprises signaling to the at least one of the WDs an indication of the assigned SS.
  • the overloading factor indicates how many more WDs are permitted to be served by the network node using the sequence-spreading than permitted using orthogonal multiple access, OMA.
  • the use of sequence-spreading corresponds to non-orthogonal multiple access, NOMA.
  • the method further comprises assigning a respective SS to each of the WDs, each SS being based at least in part on the at least one SS parameter. The method further comprises signaling to each of the WDs an indication of the respective assigned SS.
  • the determining the at least one SS parameter further comprises determining the at least one SS parameter further based at least in part on a signal-to- noise ratio. In some embodiments of this aspect, the determining the at least one SS parameter further comprises determining the at least one SS parameter further based at least in part on a transport block size, TBS. In some embodiments of this aspect, the determining the at least one SS parameter further comprises determining the at least one SS parameter further based at least in part on a latency requirement. In some embodiments of this aspect, the at least one SS parameter further comprises at least one of a number of available sequences and inter-sequence properties.
  • the method further comprises selecting the SS from a lookup table based on the determined at least one SS parameter. In some embodiments of this aspect, the method further comprises receiving a signal from the at least one of the WDs and demodulating the signal using the assigned SS.
  • FIG. 1 is a schematic diagram of an exemplary network architecture illustrating a communication system connected via an intermediate network to a host computer according to the principles in the present disclosure
  • FIG. 2 is a block diagram of a host computer communicating via a network node with a wireless device over an at least partially wireless connection according to some embodiments of the present disclosure
  • FIG. 3 is a flowchart of an exemplary process in a network node for non-orthogonal signature sequence selection according to some embodiments of the present disclosure
  • FIG. 4 is a flowchart of an exemplary process in a wireless device for non-orthogonal signature sequence selection according to some embodiments of the present disclosure
  • FIG. 5 is a flowchart of yet another exemplary process in a network node for non- orthogonal signature sequence selection according to some embodiments of the present disclosure.
  • FIG. 6 is a graph of example parameters for selecting signature sequences.
  • relational terms such as“first” and“second,”“top” and“bottom,” and the like, may be used solely to distinguish one entity or element from another entity or element without necessarily requiring or implying any physical or logical relationship or order between such entities or elements.
  • the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the concepts described herein.
  • the singular forms“a”,“an” and“the” are intended to include the plural forms as well, unless the context clearly indicates otherwise.
  • the joining term,“in communication with” and the like may be used to indicate electrical or data communication, which may be accomplished by physical contact, induction, electromagnetic radiation, radio signaling, infrared signaling or optical signaling, for example.
  • electrical or data communication may be accomplished by physical contact, induction, electromagnetic radiation, radio signaling, infrared signaling or optical signaling, for example.
  • the term“coupled,”“connected,” and the like may be used herein to indicate a connection, although not necessarily directly, and may include wired and/or wireless connections.
  • Implicit indication may for example be based on position and/or resource used for transmission.
  • Explicit indication may for example be based on a
  • control signaling as described herein, based on the utilized resource sequence, implicitly indicates the control signaling type.
  • signal used herein can be any physical signal or physical channel.
  • Examples of physical signals are reference signal such as PSS, SSS, CRS, PRS etc.
  • the term‘physical channel’ and‘channel’ may be used herein interchangeably.
  • Examples of physical channels are MIB, PBCH, NPBCH, PDCCH, PDSCH, sPUCCH, sPDSCH. sPUCCH. sPUSCH, MPDCCH, NPDCCH, NPDSCH, E-PDCCH, PUSCH, PUCCH, NPUSCH, etc. These terms/abbreviations may be used according to 3 GPP standard language, in particular according to LTE and NR.
  • At least one uplink (UL) connection and/or channel and/or carrier and at least one downlink (DL) connection and/or channel and/or carrier e.g., via and/or defining a cell, which may be provided by a network node, in particular a base station or eNodeB.
  • An uplink direction may refer to a data transfer direction from a terminal to a network node, e.g., base station and/or relay station.
  • a downlink direction may refer to a data transfer direction from a network node, e.g., base station and/or relay node, to a terminal.
  • UL and DL may be associated to different frequency resources, e.g., carriers and/or spectral bands.
  • a cell may comprise at least one uplink carrier and at least one downlink carrier, which may have different frequency bands.
  • a network node e.g., a base station or eNodeB, may be adapted to provide and/or define and/or control one or more cells, e.g., a PCell (primary cell).
  • Transmitting in downlink may pertain to transmission from the network or network node to the terminal.
  • Transmitting in uplink may pertain to transmission from the terminal to the network or network node.
  • Transmitting in sidelink may pertain to (direct) transmission from one terminal to another.
  • Uplink, downlink and sidelink (e.g., sidelink transmission and reception) may be considered communication directions.
  • uplink and downlink may also be used to described wireless communication between network nodes, e.g. for wireless backhaul and/or relay communication and/or (wireless) network communication for example between base stations or similar network nodes, in particular communication terminating at such. It may be considered that backhaul and/or relay communication and/or network communication is implemented as a form of sidelink or uplink communication or similar thereto.
  • configuring may include determining configuration data representing the configuration and providing, e.g. transmitting, it to one or more other nodes (parallel and/or sequentially), which may transmit it further to the radio node (or another node, which may be repeated until it reaches the wireless device).
  • configuring a radio node e.g., by a network node 16 or other device, may include receiving configuration data and/or data pertaining to configuration data, e.g., from another node like a network node, which may be a higher-level node of the network, and/or transmitting received configuration data to the radio node.
  • determining a configuration and transmitting the configuration data to the radio node may be performed by different network nodes or entities, which may be able to communicate via a suitable interface, e.g., an X2 interface in the case of LTE or a corresponding interface for NR.
  • Configuring a terminal may comprise scheduling downlink and/or uplink transmissions for the terminal, e.g. downlink data and/or downlink control signaling and/or DCI and/or uplink control or data or communication signaling, in particular
  • configuring a terminal may comprise configuring the WD to perform certain measurements on certain subframes or radio resources and reporting such measurements according to embodiments of the present disclosure.
  • Signaling may comprise one or more signals and/or symbols.
  • Reference signaling may comprise one or more reference signals and/or symbols.
  • Data signaling may pertain to signals and/or symbols containing data, in particular user data and/or payload data and/or data from a communication layer above the radio and/or physical layer/s. It may be considered that demodulation reference signaling comprises one or more demodulation signals and/or symbols.
  • Demodulation reference signaling may in particular comprise DM-RS according to 3GPP and/or LTE and NR technologies. Demodulation reference signaling may generally be considered to represent signaling providing reference for a receiving device like a terminal to decode and/or demodulate associated data signaling or data.
  • Demodulation reference signaling may be associated to data or data signaling, in particular to specific data or data signaling. It may be considered that data signaling and demodulation reference signaling are interlaced and/or multiplexed, e.g. arranged in the same time interval covering e.g. a subframe or slot or symbol, and/or in the same time-frequency resource structure like a resource block.
  • a resource element may represent a smallest time-frequency resource, e.g. representing the time and frequency range covered by one symbol or a number of bits represented in a common modulation.
  • a resource element may e.g. cover a symbol time length and a subcarrier, in particular in 3GPP and/or LTE and NR standards.
  • a data transmission may represent and/or pertain to transmission of specific data, e.g. a specific block of data and/or transport block.
  • demodulation reference signaling may comprise and/or represent a sequence of signals and/or symbols, which may identify and/or define the demodulation reference signaling.
  • Data or information may refer to any kind of data, in particular any one of and/or any combination of control data or user data or payload data.
  • Control information (which may also be referred to as control data) may refer to data controlling and/or scheduling and/or pertaining to the process of data transmission and/or the network or terminal operation.
  • network node can be any kind of network node comprised in a radio network which may further comprise any of base station (BS), radio base station, base transceiver station (BTS), base station controller (BSC), radio network controller (RNC), g Node B (gNB), evolved Node B (eNB or eNodeB), Node B, multi- standard radio (MSR) radio node such as MSR BS, multi-cell/multicast coordination entity (MCE), integrated access and backhaul (IAB) node, relay node, donor node controlling relay, radio access point (AP), transmission points, transmission nodes, Remote Radio Unit (RRU) Remote Radio Head (RRH), a core network node (e.g., mobile management entity (MME), self-organizing network (SON) node, a coordinating node, positioning node, MDT node, etc.), an external node (e.g., 3rd party node, a node external to the current network), nodes in distributed antenna system (
  • BS base station
  • wireless device or a user equipment (UE) are used interchangeably.
  • the WD herein can be any type of wireless device capable of communicating with a network node or another WD over radio signals, such as wireless device (WD).
  • the WD may also be a radio communication device, target device, device to device (D2D) WD, machine type WD or WD capable of machine to machine communication (M2M), low-cost and/or low-complexity WD, a sensor equipped with WD, Tablet, mobile terminals, smart phone, laptop embedded equipped (LEE), laptop mounted equipment (LME), USB dongles, Customer Premises Equipment (CPE), an Internet of Things (IoT) device, or a
  • Narrowband IoT (NB-IOT) device etc.
  • the generic term“radio network node” is used. It can be any kind of a radio network node which may comprise any of base station, radio base station, base transceiver station, base station controller, network controller, RNC, evolved Node B (eNB), Node B, gNB, Multi-ccll/multicast Coordination Entity (MCE), relay node, IAB node, access point, radio access point, Remote Radio Unit (RRU) Remote Radio Head (RRH).
  • WCDMA Wide Band Code Division Multiple Access
  • WiMax Worldwide Interoperability for Microwave Access
  • UMB Ultra Mobile Broadband
  • GSM Global System for Mobile Communications
  • functions described herein as being performed by a wireless device or a network node may be distributed over a plurality of wireless devices and/or network nodes.
  • the functions of the network node and wireless device described herein are not limited to performance by a single physical device and, in fact, can be distributed among several physical devices.
  • Some embodiments include a method for flexibly determining SS properties and/or specific SS sets to be allocated to users in given conditions or operating scenarios, so that a chosen performance metric is improved or optimized.
  • Some embodiments include a method for selecting a NOMA SS set for a group of WDs in the NW, given operating conditions, e.g., in terms of the number of desired NOMA users or the degree of overloading, signal to interference plus noise ratio (SINR) conditions, transport block size or coding rate, etc.
  • SINR signal to interference plus noise ratio
  • a suitable SS set for the given conditions may be determined based on stored SS design parameter tables (length, set size, etc.) where each entry can be indexed using one or more operating conditions parameters (SINR, transport block size (TBS), overloading, latency, etc.). Alternatively, it may be determined using change guidelines compared to the currently selected SS (e.g. for higher SINR operating point, increased sequence length).
  • the NW can also select suitable settings for transmission parameters that are free to be controlled, based on other parameters that are constrained due to use cases or network procedures.
  • the SS selection can be based on optimizing performance metrics like block error rate (BLER), sum rate, rate per resource element (RE), etc.
  • BLER block error rate
  • RE rate per resource element
  • Some embodiments systematically select (near-)optimal NOMA SS parameters for a set of WDs given the operating conditions and requirements for that set of WDs. Embodiments thus allow for maximizing NOMA performance (TP/rate, BLER) and increasing NOMA operational efficiency and NW capacity as compared with known arrangements.
  • FIG. 1 a schematic diagram of a communication system 10, according to an embodiment, such as a 3GPP-type cellular network that may support standards such as LTE and/or NR (5G), which comprises an access network 12, such as a radio access network, and a core network 14.
  • the access network 12 comprises a plurality of network nodes l6a, l6b, l6c (referred to collectively as network nodes 16), such as NBs, eNBs, gNBs or other types of wireless access points, each defining a corresponding coverage area l8a, 18b, l8c (referred to collectively as coverage areas 18).
  • Each network node l6a, 16b, l6c is connectable to the core network 14 over a wired or wireless connection 20.
  • a first wireless device (WD) 22a located in coverage area l8a is configured to wirelessly connect to, or be paged by, the corresponding network node l6c.
  • a second WD 22b in coverage area 18b is wirelessly connectable to the corresponding network node l6a. While a plurality of WDs 22a, 22b
  • wireless devices 22 are illustrated in this example, the disclosed embodiments are equally applicable to a situation where a sole WD is in the coverage area or where a sole WD is connecting to the corresponding network node 16. Note that although only two WDs 22 and three network nodes 16 are shown for convenience, the communication system may include many more WDs 22 and network nodes 16.
  • a WD 22 can be in simultaneous communication and/or configured to separately communicate with more than one network node 16 and more than one type of network node 16.
  • a WD 22 can have dual connectivity with a network node 16 that supports LTE and the same or a different network node 16 that supports NR.
  • WD 22 can be in communication with an eNB for LTE/E-UTRAN and a gNB for NR/NG-RAN.
  • the communication system 10 may itself be connected to a host computer 24, which may be embodied in the hardware and/or software of a standalone server, a cloud-implemented server, a distributed server or as processing resources in a server farm.
  • the host computer 24 may be under the ownership or control of a service provider, or may be operated by the service provider or on behalf of the service provider.
  • the communication system 10 and the host computer 24 may extend directly from the core network 14 to the host computer 24 or may extend via an optional intermediate network 30.
  • the intermediate network 30 may be one of, or a combination of more than one of, a public, private or hosted network.
  • the intermediate network 30, if any, may be a backbone network or the Internet.
  • the intermediate network 30 may comprise two or more sub- networks (not shown).
  • the communication system of FIG. 1 as a whole enables connectivity between one of the connected WDs 22a, 22b and the host computer 24.
  • the connectivity may be described as an over-the-top (OTT) connection.
  • the host computer 24 and the connected WDs 22a, 22b are configured to communicate data and/or signaling via the OTT connection, using the access network 12, the core network 14, any intermediate network 30 and possible further infrastructure (not shown) as intermediaries.
  • the OTT connection may be transparent in the sense that at least some of the participating communication devices through which the OTT connection passes are unaware of routing of uplink and downlink communications.
  • a network node 16 may not or need not be informed about the past routing of an incoming downlink communication with data originating from a host computer 24 to be forwarded (e.g., handed over) to a connected WD 22a. Similarly, the network node 16 need not be aware of the future routing of an outgoing uplink communication originating from the WD 22a towards the host computer 24.
  • a network node 16 is configured to include a signature sequence (SS) determination unit 32 which is configured to determine SS parameters based on operating conditions.
  • a wireless device 22 is configured to include a SS information unit 34 which is configured to receive SS information indicating a particular SS to use for NOMA signal transmission.
  • SS signature sequence
  • network node 16 is configured to include a signature sequence (SS) determination unit 32 which is configured to determine at least one signature sequence, SS, parameter based at least in part on a number of WDs 22 to be served by the network node 16 using the sequence-spreading, the at least one SS parameter comprising an SS length and an overloading factor; assign a SS to at least one of the WDs 22, the SS being based at least in part on the at least one SS parameter; and signal to the at least one of the WDs 22 an indication of the assigned SS.
  • SS signature sequence
  • a host computer 24 comprises hardware (HW) 38 including a communication interface 40 configured to set up and maintain a wired or wireless connection with an interface of a different communication device of the communication system 10.
  • the host computer 24 further comprises processing circuitry 42, which may have storage and/or processing capabilities.
  • the processing circuitry 42 may include a processor 44 and memory 46.
  • the processing circuitry 42 may comprise integrated circuitry for processing and/or control, e.g., one or more processors and/or processor cores and/or FPGAs (Field Programmable Gate Array) and/or ASICs (Application Specific Integrated Circuitry) adapted to execute instructions.
  • processors and/or processor cores and/or FPGAs Field Programmable Gate Array
  • ASICs Application Specific Integrated Circuitry
  • the processor 44 may be configured to access (e.g., write to and/or read from) memory 46, which may comprise any kind of volatile and/or nonvolatile memory, e.g., cache and/or buffer memory and/or RAM (Random Access Memory) and/or ROM (Read-Only Memory) and/or optical memory and/or EPROM (Erasable Programmable Read- Only Memory).
  • memory 46 may comprise any kind of volatile and/or nonvolatile memory, e.g., cache and/or buffer memory and/or RAM (Random Access Memory) and/or ROM (Read-Only Memory) and/or optical memory and/or EPROM (Erasable Programmable Read- Only Memory).
  • Processing circuitry 42 may be configured to control any of the methods and/or processes described herein and/or to cause such methods, and/or processes to be performed, e.g., by host computer 24.
  • Processor 44 corresponds to one or more processors 44 for performing host computer 24 functions described herein.
  • the host computer 24 includes memory 46 that is configured to store data, programmatic software code and/or other information described herein.
  • the software 48 and/or the host application 50 may include instructions that, when executed by the processor 44 and/or processing circuitry 42, causes the processor 44 and/or processing circuitry 42 to perform the processes described herein with respect to host computer 24.
  • the instructions may be software associated with the host computer 24.
  • the software 48 may be executable by the processing circuitry 42.
  • the software 48 includes a host application 50.
  • the host application 50 may be operable to provide a service to a remote user, such as a WD 22 connecting via an OTT connection 52 terminating at the WD 22 and the host computer 24.
  • the host application 50 may provide user data which is transmitted using the OTT connection 52.
  • The“user data” may be data and information described herein as implementing the described functionality.
  • the host computer 24 may be configured for providing control and functionality to a service provider and may be operated by the service provider or on behalf of the service provider.
  • the processing circuitry 42 of the host computer 24 may enable the host computer 24 to observe, monitor, control, transmit to and/or receive from the network node 16 and or the wireless device 22.
  • the communication system 10 further includes a network node 16 provided in a communication system 10 and comprising hardware 58 enabling it to communicate with the host computer 24 and with the WD 22.
  • the hardware 58 may include a communication interface 60 for setting up and maintaining a wired or wireless connection with an interface of a different communication device of the communication system 10, as well as a radio interface 62 for setting up and maintaining at least a wireless connection 64 with a WD 22 located in a coverage area 18 served by the network node 16.
  • the radio interface 62 may be formed as or may include, for example, one or more RF transmitters, one or more RF receivers, and/or one or more RF transceivers.
  • the communication interface 60 may be configured to facilitate a connection 66 to the host computer 24.
  • the connection 66 may be direct or it may pass through a core network 14 of the communication system 10 and/or through one or more intermediate networks 30 outside the communication system 10.
  • the hardware 58 of the network node 16 further includes processing circuitry 68.
  • the processing circuitry 68 may include a processor 70 and a memory 72.
  • the processing circuitry 68 may comprise integrated circuitry for processing and/or control, e.g., one or more processors and/or processor cores and/or FPGAs (Field Programmable Gate Array) and/or ASICs (Application Specific Integrated Circuitry) adapted to execute instructions.
  • FPGAs Field Programmable Gate Array
  • ASICs Application Specific Integrated Circuitry
  • the processor 70 may be configured to access (e.g., write to and/or read from) the memory 72, which may comprise any kind of volatile and/or nonvolatile memory, e.g., cache and/or buffer memory and/or RAM (Random Access Memory) and/or ROM (Read-Only Memory) and/or optical memory and/or EPROM (Erasable Programmable Read-Only Memory).
  • volatile and/or nonvolatile memory e.g., cache and/or buffer memory and/or RAM (Random Access Memory) and/or ROM (Read-Only Memory) and/or optical memory and/or EPROM (Erasable Programmable Read-Only Memory).
  • the network node 16 further has software 74 stored internally in, for example, memory 72, or stored in external memory (e.g., database, storage array, network storage device, etc.) accessible by the network node 16 via an external connection.
  • the software 74 may be executable by the processing circuitry 68.
  • the processing circuitry 68 may be configured to control any of the methods and/or processes described herein and/or to cause such methods, and/or processes to be performed, e.g., by network node 16.
  • Processor 70 corresponds to one or more processors 70 for performing network node 16 functions described herein.
  • the memory 72 is configured to store data, programmatic software code and/or other information described herein.
  • the software 74 may include instructions that, when executed by the processor 70 and/or processing circuitry 68, causes the processor 70 and/or processing circuitry 68 to perform the processes described herein with respect to network node 16.
  • processing circuitry 68 of the network node 16 may include the SS determination unit 32 configured to determine SS parameters based on operating conditions.
  • processing circuitry 68 of the network node 16 may include the SS determination unit 32 configured to determine at least one signature sequence, SS, parameter based at least in part on a number of WDs 22 to be served by the network node 16 using the sequence-spreading, the at least one SS parameter comprising an SS length and an overloading factor; assign an SS to at least one of the WDs 22, the SS being based at least in part on the at least one SS parameter; and signal to the at least one of the WDs 22 an indication of the assigned SS.
  • the overloading factor indicates how many more WDs 22 are permitted to be served by the network node 16 using the sequence-spreading than are permitted using orthogonal multiple access, OMA.
  • the use of sequence-spreading corresponds to non-orthogonal multiple access, NOMA.
  • the processing circuitry 68 is further configured to: assign a respective SS to each of the WDs 22, each SS being based at least in part on the at least one SS parameter; and signal to each of the WDs 22 an indication of the respective assigned SS.
  • the processing circuitry 68 is further configured to determine the at least one SS parameter by being configured to determine the at least one SS parameter further based at least in part on a signal-to-noise ratio.
  • the processing circuitry 68 is further configured to determine the at least one SS parameter by being configured to determine the at least one SS parameter further based at least in part on a transport block size, TBS. In some embodiments, the processing circuitry 68 is further configured to determine the at least one SS parameter by being configured to determine the at least one SS parameter further based at least in part on a latency requirement. In some embodiments, the at least one SS parameter further comprises at least one of a number of available sequences and inter-sequence properties. In some embodiments, the processing circuitry 68 is further configured to select the SS from a lookup table based on the determined at least one SS parameter. In some embodiments, the processing circuitry 68 is further configured to receive a signal from the at least one of the WDs 22 and demodulate the signal using the assigned SS.
  • TBS transport block size
  • the processing circuitry 68 is further configured to determine the at least one SS parameter by being configured to determine the at least one SS parameter further based at least in
  • the communication system 10 further includes the WD 22 already referred to.
  • the WD 22 may have hardware 80 that may include a radio interface 82 configured to set up and maintain a wireless connection 64 with a network node 16 serving a coverage area 18 in which the WD 22 is currently located.
  • the radio interface 82 may be formed as or may include, for example, one or more RF transmitters, one or more RF receivers, and/or one or more RF transceivers.
  • the hardware 80 of the WD 22 further includes processing circuitry 84.
  • the processing circuitry 84 may include a processor 86 and memory 88.
  • the processing circuitry 84 may comprise integrated circuitry for processing and/or control, e.g., one or more processors and/or processor cores and/or FPGAs (Field Programmable Gate Array) and/or ASICs (Application Specific Integrated Circuitry) adapted to execute instructions.
  • the processor 86 may be configured to access (e.g., write to and/or read from) memory 88, which may comprise any kind of volatile and/or nonvolatile memory, e.g., cache and/or buffer memory and/or RAM (Random Access Memory) and/or ROM (Read-Only Memory) and/or optical memory and/or EPROM (Erasable Programmable Read-Only Memory).
  • memory 88 may comprise any kind of volatile and/or nonvolatile memory, e.g., cache and/or buffer memory and/or RAM (Random Access Memory) and/or ROM (Read-Only Memory) and/or optical memory and/or EPROM (Erasable Programmable Read-Only Memory).
  • the WD 22 may further comprise software 90, which is stored in, for example, memory 88 at the WD 22, or stored in external memory (e.g., database, storage array, network storage device, etc.) accessible by the WD 22.
  • the software 90 may be executable by the processing circuitry 84.
  • the client application 92 may be operable to provide a service to a human or non-human user via the WD 22, with the support of the host computer 24.
  • an executing host application 50 may communicate with the executing client application 92 via the OTT connection 52 terminating at the WD 22 and the host computer 24.
  • the client application 92 may receive request data from the host application 50 and provide user data in response to the request data.
  • the OTT connection 52 may transfer both the request data and the user data.
  • the client application 92 may interact with the user to generate the user data that it provides.
  • the processing circuitry 84 may be configured to control any of the methods and/or processes described herein and/or to cause such methods, and/or processes to be performed, e.g., by WD 22.
  • the processor 86 corresponds to one or more processors 86 for performing WD 22 functions described herein.
  • the WD 22 includes memory 88 that is configured to store data, programmatic software code and/or other information described herein.
  • the software 90 and/or the client application 92 may include instructions that, when executed by the processor 86 and/or processing circuitry 84, causes the processor 86 and/or processing circuitry 84 to perform the processes described herein with respect to WD 22.
  • the processing circuitry 84 of the wireless device 22 may include a SS information unit 34 configured to receive SS information indicating a particular SS to be used in NOMA signal transmissions.
  • the inner workings of the network node 16, WD 22, and host computer 24 may be as shown in FIG. 2 and independently, the surrounding network topology may be that of FIG. 1.
  • Network infrastructure may determine the routing, which it may be configured to hide from the WD 22 or from the service provider operating the host computer 24, or both. While the OTT connection 52 is active, the network infrastructure may further take decisions by which it dynamically changes the routing (e.g., on the basis of load balancing consideration or reconfiguration of the network).
  • the wireless connection 64 between the WD 22 and the network node 16 is in accordance with the teachings of the embodiments described throughout this disclosure.
  • One or more of the various embodiments improve the performance of OTT services provided to the WD 22 using the OTT connection 52, in which the wireless connection 64 may form the last segment. More precisely, the teachings of some of these embodiments may improve the data rate, latency, and/or power consumption and thereby provide benefits such as reduced user waiting time, relaxed restriction on file size, better responsiveness, extended battery lifetime, etc.
  • a measurement procedure may be provided for the purpose of monitoring data rate, latency and other factors on which the one or more embodiments improve.
  • the measurement procedure and/or the network functionality for reconfiguring the OTT connection 52 may be implemented in the software 48 of the host computer 24 or in the software 90 of the WD 22, or both.
  • sensors (not shown) may be deployed in or in association with communication devices through which the OTT connection 52 passes; the sensors may participate in the measurement procedure by supplying values of the monitored quantities exemplified above, or supplying values of other physical quantities from which software 48, 90 may compute or estimate the monitored quantities.
  • the reconfiguring of the OTT connection 52 may include message format, retransmission settings, preferred routing etc.; the reconfiguring need not affect the network node 16, and it may be unknown or imperceptible to the network node 16. Some such procedures and functionalities may be known and practiced in the art.
  • measurements may involve proprietary WD signaling facilitating the host computer’s 24 measurements of throughput, propagation times, latency and the like.
  • the measurements may be implemented in that the software 48, 90 causes messages to be transmitted, in particular empty or‘dummy’ messages, using the OTT connection 52 while it monitors propagation times, errors etc.
  • the host computer 24 includes processing circuitry 42 configured to provide user data and a communication interface 40 that is configured to forward the user data to a cellular network for transmission to the WD 22.
  • the cellular network also includes the network node 16 with a radio interface 62.
  • the network node 16 is configured to, and/or the network node’s 16 processing circuitry 68 is configured to perform the functions and/or methods described herein for preparing/initiating/maintaining/supporting/ending a transmission to the WD 22, and/or preparing/terminating/maintaining/supporting/ending in receipt of a transmission from the WD 22.
  • the host computer 24 includes processing circuitry 42 and a communication interface 40 that is configured to a communication interface 40 configured to receive user data originating from a transmission from a WD 22 to a network node 16.
  • the WD 22 is configured to, and/or comprises a radio interface 82 and/or processing circuitry 84 configured to perform the functions and/or methods described herein for preparing/initiating/maintaining/supporting/ending a transmission to the network node 16, and/or preparing/terminating/maintaining/supporting/ending in receipt of a transmission from the network node 16.
  • FIGS. 1 and 2 show various“units” such as SS determination unit 32, and SS information unit 34 as being within a respective processor, it is contemplated that these units may be implemented such that a portion of the unit is stored in a corresponding memory within the processing circuitry. In other words, the units may be implemented in hardware or in a combination of hardware and software within the processing circuitry.
  • FIG. 3 is a flowchart of an exemplary process in a network node 16 for non-ortho gonal multiple access signature sequence selection.
  • the process includes determining, via SS parameter determination unit 32, signature sequence (SS) parameters based on operating conditions (block S134).
  • the process also includes assigning, via the processor 70, respective SSs to multiple WDs 22, the SSs being based at least in part on the SS parameters (block S136).
  • the process also includes signaling to each WD an indication of the SS assigned to the WD (block S138).
  • FIG. 4 is a flowchart of an exemplary process in a wireless device 22 according to some embodiments of the present disclosure.
  • the process includes receiving, via the radio interface 82, signature sequence (SS) information indicating a particular SS to use for NOMA signal transmission (block S140).
  • the process also includes performing, via processor 86, non- orthogonal multiple access (NOMA) signal transmission to the network node 16 using the particular SS (block S142).
  • SS signature sequence
  • NOMA non- orthogonal multiple access
  • FIG. 5 is a flowchart of yet another exemplary process in a network node 16 for non- orthogonal multiple access signature sequence selection.
  • the process includes determining (block S144), such as via SS parameter determination unit 32, at least one signature sequence,
  • the process includes assigning (block S146), such as via SS parameter determination unit 32, a SS to at least one of the WDs 22, the SS being based at least in part on the at least one SS parameter.
  • the process includes signaling (block S148), such as via SS parameter determination unit 32 and/or radio interface 62, to the at least one of the WDs 22 an indication of the assigned SS.
  • the overloading factor indicates how many more WDs 22 are permitted to be served by the network node 16 using the sequence-spreading than permitted using orthogonal multiple access, OMA.
  • the use of sequence-spreading corresponds to non-orthogonal multiple access, NOMA.
  • the method further includes assigning, such as via SS parameter determination unit 32, a respective SS to each of the WDs 22, each SS being based at least in part on the at least one SS parameter; and signaling, such as via SS parameter determination unit 32 and/or radio interface 62, to each of the WDs 22 an indication of the respective assigned SS.
  • the determining the at least one SS parameter further comprises determining, such as via SS parameter determination unit 32, the at least one SS parameter further based at least in part on a signal-to- noise ratio. In some embodiments, the determining the at least one SS parameter further comprises determining, such as via SS parameter determination unit 32, the at least one SS parameter further based at least in part on a transport block size, TBS. In some embodiments, the determining the at least one SS parameter further comprises determining the at least one SS parameter further based at least in part on a latency requirement. In some embodiments, the at least one SS parameter further comprises at least one of a number of available sequences and inter-sequence properties.
  • the method further comprises selecting, such as via SS parameter determination unit 32, the SS from a lookup table based on the determined at least one SS parameter. In some embodiments, the method further comprises receiving, such as via SS parameter determination unit 32 and/or radio interface 62, a signal from the at least one of the WDs 22 and demodulating the signal using the assigned SS.
  • NW e.g., network node 16
  • the processor 70 of the network node 16 may assess the operating conditions and the transmission scenario in terms of, e.g., the number of WDs 22 to be served in relation to the total available resources (possible or expected overloading), the TBS to be transmitted, channel qualities (e.g. signal to noise ratio (SNR) or SINR) for the different users, and possibly additional aspects like maximal latency tolerance (limiting the SS length in some cases).
  • the NW also determines which transmission parameters it can freely choose for NOMA optimization and which will be dictated by the use case and other NW configurations.
  • the NW e.g., network node 16 determines SS parameters (one or more of, e.g., length, number of available sequences, inter-sequence properties) and optionally determines one or more transmission parameters out of the ones that were identified as free in step A.
  • SS parameters one or more of, e.g., length, number of available sequences, inter-sequence properties
  • the determination step may be performed using a lookup table that contains SS parameters and free transmission parameter values and which can be indexed by operating conditions and fixed transmission parameters.
  • the lookup table may be stored in the memory 72 of the network node 16.
  • the determination may be based on multiple guidelines about how changes in operating conditions affect the optimal choice of SS and transmission parameters. These options are described below.
  • the look up table (LUT) and guidelines may be predetermined, at least partially based on numerical simulations of multiple combinations of transmission and operating conditions.
  • the network node 16 informs multiple WDs 22 about their respective SS sequences. This may be done, e.g., by signaling indices into relevant lookup tables containing vector contents, or by signaling vector element values directly.
  • the network node 16 may provide the WD 22 with SS pool parameters (e.g., length, design parameters, etc.) from which the WD 22 autonomously picks an SS to use for transmission.
  • the network may indicate to a WD 22 that no spreading should be used and non-overloaded, orthogonal multiple access is used.
  • One such operating condition can be certain reliability requirements, etc.
  • step D the NW (e.g., network node 16) receives signals from the multiple WDs 22 previously configured with SS information and uses the SS information to properly configure its receiver for signal demodulation.
  • NW e.g., network node 16
  • Some embodiments are transparent to the WD 22 (no changes compared to conventional NOMA transmission) and can be expressed via the following steps:
  • step E the WD 22 receives the SS signaling sent by the network node 16 in step C above.
  • step F the WD 22 applies the received SS to the data to be transmitted, or additionally first obtains a SS based on the received properties, and transmits its NOMA data to the network node 16.
  • the WD 22 may optionally perform an earlier step of indicating to the network node 16 its capability of performing NOMA with e.g. certain sequence length, etc.
  • FIG. 6 illustrates several examples of the guidelines and principles described below, using numerical simulations of the“sum rate per RE” metric for different SS designs and operating conditions. (Note, however that a sparse parameter space has been evaluated and in many cases intermediate values result in maximized performance.)
  • TBS 60 bytes maximizes performance.
  • the NW may then inform the WDs 22 to use SS with that length and TBS, and allow the appropriate number of NOMA users to access the network simultaneously.
  • the network node 16 may then inform the WDs 22 to use SS with that length and TBS, and allow the appropriate number of NOMA users to access the network simultaneously.
  • the potential gains for a Welch-bound Spreading Multiple Access (WSMA) based NOMA system may be realized in an overloaded system, i.e., when the number of users is greater than the SS length.
  • the rate-per-RE may also increase. This however may depend on the overloading factor p and/or the SNR range.
  • the deciding factor for selecting the SS length L and the overloading factor p may start with identifying the number of WDs K and the TBS for each WD, which may be assumed to be fixed during the implementation.
  • Tolerable SNR may be based on the WD-specific application and may be obtained from the channel conditions.
  • Smaller SS lengths may perform better at higher overloading over a range of SNR values.
  • wsma4 and wsma6 are serving 16 and 24 WDs respectively.
  • the rate-per-RE is substantially lower for the latter (wsma6) when compared to the former (wsma4) for a range of SNR values.
  • the latter outperforms the former, where wsma4 has a saturated rate-per-RE. So the SS length may be considered along with its overloading factor.
  • the rate-per-RE curves saturate with increasing SNR. So it may be useful to identify the SNR range where the WSMA curves have a non-decreasing gain.
  • the preferred setting for smaller TBS (for example 20 bytes) is to operate at small SNR values. Any gain with increasing SNR may be possible with further overloading.
  • the SNR range may be pre-determined to keep L fixed.
  • wsma4 may be adopted.
  • guidelines may be expressed as more elaborate descriptions, e.g.,
  • the deciding factor for selecting the SS length L and the overloading factor p can start with identifying the number of WDs 22, K, and the TBS for each WD 22, which are assumed to be fixed during the implementation.
  • Tolerable SNR is based on the WD 22 specific application and may be obtained from the channel conditions.
  • wsma4 and wsma6 are serving 16 and 24 WDs 22 respectively.
  • the rate-per-RE is substantially lower for the latter (wsma6) when compared to the former (wsma4) for a range of SNR values.
  • the latter outperforms the former, where wsma4 has a saturated rate-per-RE. So, the SS length may be specified along with its overloading factor.
  • TBS for example, 20 bytes
  • the SNR range can be pre-determined to keep L fixed. For example, up to around lOdB SNR, wsma4 may be adopted. There might be a reduced rate-per- RE with decreasing SNR at higher overloading, but this trade-off is acceptable since there is no reconfiguration of the entire system.
  • the following example illustrates one approach to SS vector production to generate codebooks and/or individual WD 22 SS vectors. (Note that other approaches may be possible, but the selection and signaling principles described above may be applicable regardless of the specific approach used.) The obtained SSs are then signaled or otherwise distributed to WDs 22.
  • each user has a single symbol to transmit.
  • This symbol modulates a temporal codeword (CW) vector, called a signature sequence (SS), before transmitting the vector over N time slots, i.e., the symbol is spread (or repeated) over N time slots.
  • CW temporal codeword
  • SS signature sequence
  • this representation is a sampled baseband version of the communication process.
  • SS and CW are used with the same meaning here. Since all the users access the channel over the same N time slots, there is interference among them. This interference arising due to the multiple access (MA) is called Multiple Access Interference (MAI).
  • MAI Multiple Access Interference
  • This MA communication may be viewed as a network (NW) with N degrees of freedom (DoF) trying to serve K users, each with a required quality of service (QoS). So the design of the SS so that each CW is placed at an optimal distance (or angle) from each other in the vector space.
  • K ⁇ N there can be a collision free transmission from all the users, since there can be at least one DoF, which is a time slot, for each user for its transmission.
  • This leads to an interference free transmission and such a MA transmission scheme is called orthogonal multiple access (OMA). With OMA there is a performance loss, which is quite visible when each user has a Quality of Service (QoS).
  • QoS Quality of Service
  • SC system capacity
  • OMA Non-Orthogonal Multiple Access
  • the SS for each of the K users must be designed in such a manner that the overall mean squared error (MSE) is minimized.
  • MSE mean squared error
  • PI performance indicator
  • SINR signal to noise plus interference ratio
  • SC system capacity
  • TSC total squared correlation
  • the transmit power of each user is set to unity, so the power control problem is not addressed here.
  • a unit norm temporal receive filter f k such as a matched filter (MF) or a linear minimum mean squared error (MMSE) filter, may be employed by the receiver to obtain an estimate b k for the transmitted symbol b k .
  • MF matched filter
  • MMSE linear minimum mean squared error
  • trace ( ) is the trace operator
  • v k is the noise component in the SINR y k
  • the trace ( ) term in the denominator is the TSC, which also contains the desired unit signal power.
  • the post processed noise is white, i.e., the noise power of each v k is the same, then the TSC can directly be used as a PI.
  • a lower bound (LB) known as Welch Bound (WB) is defined for the TSC.
  • IA interference avoidance
  • R k Sj s? + I), which is the correlation matrix of the interference plus noise. It can be readily identified that minimizing the denominator (or equivalently maximizing y ) is a well known Rayleigh-Quotient problem. From this, the Eigen vector corresponding to the minimum Eigen value of R may be considered as CW for user k, if it is assumed that f is matched to s . The fixed-point iterations start from the users choosing a random CW. In a given sequential user order, each user updates its SS s k by solving the Eigen value problem while other SS, Sj,j 1 k, are kept fixed.
  • the next user updates it’s CW in the same way by assuming the other CWs to be fixed.
  • the iterations progress up to the final user in the order, such that in each iteration there are K updates, one for each CW in S.
  • the first user in the order restarts the updates until convergence.
  • the solution to f k can also be identified as the well known Generalized Eigen Value Problem (GEVP), i.e., finding a common Eigen value for the matrix pair (I, R k ).
  • GEVP Generalized Eigen Value Problem
  • the normalized linear MMSE expression is used during updates.
  • the obtained solution to S from both the MMSE IA iterations and the Eigen vector IA iterations may be the same fixed-point.
  • KP Karystinos-Pados
  • a network node configured to communicate with a wireless device (WD), the network node configured to, and/or comprising a radio interface and/or comprising processing circuitry configured to:
  • Embodiment A2 The network node of Embodiment Al , wherein the operating conditions include a number of WDs accessing the network node.
  • Embodiment A3 The network node of Embodiment Al , wherein the SS parameters include sequence length, number of available sequences and inter-sequence properties.
  • Embodiment A4 The network node of Embodiment Al , wherein the SSs are selected from a lookup table based on the SS parameters.
  • Embodiment A5 The network node of Embodiment Al , wherein the SSs are selected based on guidelines concerning how changes in operating conditions affect a choice of SS parameters.
  • Embodiment Bl A method implemented in a network node, the method comprising: determining signature sequence (SS) parameters based on operating conditions;
  • Embodiment B2 The method of Embodiment B 1 , wherein the operating conditions include a number of WDs accessing the network node.
  • Embodiment B3 The method of Embodiment Bl, wherein the SS parameters include sequence length, number of available sequences and inter-sequence properties.
  • Embodiment B4 The method of Embodiment Bl, wherein the SSs are selected from a lookup table based on the SS parameters.
  • Embodiment B5 The method of Embodiment Bl, wherein the SSs are selected based on guidelines concerning how changes in operating conditions affect a choice of SS parameters.
  • a wireless device configured to communicate with a network node, the WD configured to, and/or comprising a radio interface and/or processing circuitry configured to:
  • SS signature sequence
  • NOMA non- orthogonal multiple access
  • NOMA non-orthogonal multiple access
  • Embodiment C2 The WD of Embodiment Cl, wherein the WD indicates to the network node a capability of the WD to perform NOMA.
  • Embodiment Dl A method implemented in a wireless device (WD), the method comprising:
  • SS signature sequence
  • NOMA non- orthogonal multiple access
  • NOMA non-orthogonal multiple access
  • Embodiment D2 The method of Embodiment Dl, wherein the WD indicates to the network node a capability of the WD to perform NOMA.
  • the concepts described herein may be embodied as a method, data processing system, computer program product and/or computer storage media storing an executable computer program. Accordingly, the concepts described herein may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects all generally referred to herein as a “circuit” or“module.” Any process, step, action and/or functionality described herein may be performed by, and/or associated to, a corresponding module, which may be implemented in software and/or firmware and/or hardware. Furthermore, the disclosure may take the form of a computer program product on a tangible computer usable storage medium having computer program code embodied in the medium that can be executed by a computer. Any suitable tangible computer readable medium may be utilized including hard disks, CD-ROMs, electronic storage devices, optical storage devices, or magnetic storage devices.
  • These computer program instructions may also be stored in a computer readable memory or storage medium that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture including instruction means which implement the function/act specified in the flowchart and/or block diagram block or blocks.
  • the computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks.
  • the program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer.
  • the remote computer may be connected to the user's computer through a local area network (LAN) or a wide area network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet Service Provider).
  • LAN local area network
  • WAN wide area network
  • Internet Service Provider for example, AT&T, MCI, Sprint, EarthLink, etc.

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Abstract

La présente invention concerne un procédé, un nœud de réseau (NN) et un dispositif sans fil (WD) pour une sélection de séquence de signature d'accès multiple non orthogonal (NOMA). Selon un aspect, un procédé est mis en œuvre dans un nœud de réseau, le procédé consistant à déterminer au moins un paramètre de séquence de signature, SS, sur la base, au moins en partie, d'un certain nombre de dispositifs sans fil, WD, devant être desservis par le nœud de réseau à l'aide de l'étalement de séquence, l'au moins un paramètre de SS comprenant une longueur de SS et un facteur de surcharge. Le procédé consiste également à affecter une SS à au moins l'un des WD, la SS étant basée, au moins en partie, sur l'au moins un paramètre de SS. Le procédé consiste également à signaler à l'au moins un des WD une indication de la SS affectée.
PCT/EP2019/058566 2018-04-06 2019-04-04 Sélection de séquence de signature d'accès multiple non orthogonal WO2019193123A1 (fr)

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Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
ABEBE AMEHA T ET AL: "Multi-Cell Performance of Grant-Free and Non-Orthogonal Multiple Access", 2017 IEEE 85TH VEHICULAR TECHNOLOGY CONFERENCE (VTC SPRING), IEEE, 4 June 2017 (2017-06-04), pages 1 - 6, XP033254676, DOI: 10.1109/VTCSPRING.2017.8108685 *
QUALCOMM INCORPORATED: "Procedures Related to NOMA", vol. RAN WG1, no. Athens, Greece; 20180226 - 20180302, 17 February 2018 (2018-02-17), XP051398271, Retrieved from the Internet <URL:http://www.3gpp.org/ftp/tsg%5Fran/WG1%5FRL1/TSGR1%5F92/Docs/> [retrieved on 20180217] *

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