WO2020030290A1 - Appareil, procédé et programme informatique - Google Patents

Appareil, procédé et programme informatique Download PDF

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Publication number
WO2020030290A1
WO2020030290A1 PCT/EP2018/071826 EP2018071826W WO2020030290A1 WO 2020030290 A1 WO2020030290 A1 WO 2020030290A1 EP 2018071826 W EP2018071826 W EP 2018071826W WO 2020030290 A1 WO2020030290 A1 WO 2020030290A1
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WIPO (PCT)
Prior art keywords
transmission configuration
parameter value
metric
determined
timing advance
Prior art date
Application number
PCT/EP2018/071826
Other languages
English (en)
Inventor
Kari Pajukoski
Esa Tiirola
Original Assignee
Nokia Technologies Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nokia Technologies Oy filed Critical Nokia Technologies Oy
Priority to PCT/EP2018/071826 priority Critical patent/WO2020030290A1/fr
Publication of WO2020030290A1 publication Critical patent/WO2020030290A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
    • H04W56/0045—Synchronisation arrangements compensating for timing error of reception due to propagation delay compensating for timing error by altering transmission time

Definitions

  • the present application relates to a method, apparatus, system and computer program and in particular but not exclusively to scheduling uplink (UL) enhancements in New Radio (NR).
  • UL uplink
  • NR New Radio
  • a communication system can be seen as a facility that enables communication sessions between two or more entities such as user terminals, base stations and/or other nodes by providing carriers between the various entities involved in the communications path.
  • a communication system can be provided for example by means of a communication network and one or more compatible communication devices.
  • the communication sessions may comprise, for example, communication of data for carrying communications such as voice, video, electronic mail (email), text message, multimedia and/or content data and so on.
  • Non- limiting examples of services provided comprise two-way or multi-way calls, data communication or multimedia services and access to a data network system, such as the Internet.
  • wireless communication system at least a part of a communication session between at least two stations occurs over a wireless link.
  • wireless systems comprise public land mobile networks (PLMN), satellite based communication systems and different wireless local networks, for example wireless local area networks (WLAN).
  • PLMN public land mobile networks
  • WLAN wireless local area networks
  • the wireless systems can typically be divided into cells, and are therefore often referred to as cellular systems.
  • a user can access the communication system by means of an appropriate communication device or terminal.
  • a communication device of a user may be referred to as user equipment (UE) or user device.
  • UE user equipment
  • a communication device is provided with an appropriate signal receiving and transmitting apparatus for enabling communications, for example enabling access to a communication network or communications directly with other users.
  • the communication device may access a carrier provided by a station, for example a base station of a cell, and transmit and/or receive communications on the carrier.
  • the communication system and associated devices typically operate in accordance with a given standard or specification which sets out what the various entities associated with the system are permitted to do and how that should be achieved. Communication protocols and/or parameters which shall be used for the connection are also typically defined.
  • UTRAN 3G radio
  • Other examples of communication systems are the long-term evolution (LTE) of the Universal Mobile Telecommunications System (UMTS) radio-access technology and so-called 5G or New Radio (NR) networks.
  • NR is being standardized by the 3rd Generation Partnership Project
  • an apparatus comprising means for determining at least one metric for transmission configuration selection, receiving at least one parameter value associated with the at least one determined metric and determining a transmission configuration based on the at least one parameter value and at least one determined metric, wherein the transmission configuration operates without timing advance.
  • the apparatus may comprise means for causing a signal to be transmitted using one of a plurality of bandwidth parts based on the determined transmission configuration, wherein each of the plurality of bandwidth parts is associated with one of a plurality of transmission configurations.
  • the apparatus may comprise means for causing a signal to be transmitted using a zero tail discrete Fourier transform Spread orthogonal frequency division multiplexing, ZT-DFT-S- OFDM, symbol, wherein the number of resource elements allocated to zero tails is determined based on the determined transmission configuration.
  • ZT-DFT-S- OFDM discrete Fourier transform Spread orthogonal frequency division multiplexing
  • the transmission configuration may define at least one of subcarrier spacing and cyclic prefix length.
  • the at least one metric may comprise at least one of random access channel configuration and timing advance information.
  • the parameter value may comprise a random access channel configuration identifier.
  • the at least one parameter value may comprise a timing advance command.
  • the apparatus may comprise means for selecting the determined transmission configuration from a plurality of transmission configurations, wherein there is a predefined mapping between the received parameter value and the selected transmission configuration.
  • an apparatus comprising means for providing, to a user equipment, at least one parameter value associated with at least one determined metric for transmission configuration selection, for use in determining a transmission configuration based on the at least one parameter value and at least one determined metric, wherein the at least one transmission configuration operates without timing advance.
  • the apparatus may comprise means for receiving a signal from the user equipment using one of a plurality of bandwidth parts based on the determined transmission configuration, wherein each of the plurality of bandwidth parts is associated with one of a plurality of transmission configurations.
  • the apparatus may comprise means for receiving a signal from the user equipment using a zero tail discrete Fourier transform Spread orthogonal frequency division multiplexing, ZT- DFT-S-OFDM, symbol, wherein the number of resource elements allocated to zero tails is determined based on the determined transmission configuration.
  • ZT- DFT-S-OFDM discrete Fourier transform Spread orthogonal frequency division multiplexing
  • the transmission configuration may define at least one of subcarrier spacing and cyclic prefix length.
  • the at least one metric may comprise at least one of random access channel configuration and timing advance information.
  • the parameter value may comprise a random access channel configuration identifier.
  • the at least one parameter value may comprise a timing advance command.
  • the determined transmission configuration may be selected from a plurality of transmission configurations, wherein there is a predefined mapping between the received parameter value and the selected transmission configuration.
  • a method comprising determining at least one metric for transmission configuration selection, receiving at least one parameter value associated with the at least one determined metric and determining a transmission configuration based on the at least one parameter value and at least one determined metric, wherein the transmission configuration operates without timing advance.
  • the method may comprise causing a signal to be transmitted using one of a plurality of bandwidth parts based on the determined transmission configuration, wherein each of the plurality of bandwidth parts is associated with one of a plurality of transmission configurations.
  • the method may comprise causing a signal to be transmitted using a zero tail discrete Fourier transform Spread orthogonal frequency division multiplexing, ZT-DFT-S-OFDM, symbol, wherein the number of resource elements allocated to zero tails is determined based on the determined transmission configuration.
  • ZT-DFT-S-OFDM discrete Fourier transform Spread orthogonal frequency division multiplexing
  • the transmission configuration may define at least one of subcarrier spacing and cyclic prefix length.
  • the at least one metric may comprise at least one of random access channel configuration and timing advance information.
  • the parameter value may comprise a random access channel configuration identifier.
  • the at least one parameter value may comprise a timing advance command.
  • the method may comprise selecting the determined transmission configuration from a plurality of transmission configurations, wherein there is a predefined mapping between the received parameter value and the selected transmission configuration.
  • a method comprising providing, to a user equipment, at least one parameter value associated with at least one determined metric for transmission configuration selection, for use in determining a transmission configuration based on the at least one parameter value and at least one determined metric, wherein the at least one transmission configuration operates without timing advance.
  • the method may comprise receiving a signal from the user equipment using one of a plurality of bandwidth parts based on the determined transmission configuration, wherein each of the plurality of bandwidth parts is associated with one of a plurality of transmission configurations.
  • the method may comprise receiving a signal from the user equipment using a zero tail discrete Fourier transform Spread orthogonal frequency division multiplexing, ZT-DFT-S-OFDM, symbol, wherein the number of resource elements allocated to zero tails is determined based on the determined transmission configuration.
  • ZT-DFT-S-OFDM discrete Fourier transform Spread orthogonal frequency division multiplexing
  • the transmission configuration may define at least one of subcarrier spacing and cyclic prefix length.
  • the at least one metric may comprise at least one of random access channel configuration and timing advance information.
  • the parameter value may comprise a random access channel configuration identifier.
  • the at least one parameter value may comprise a timing advance command.
  • the determined transmission configuration may be selected from a plurality of transmission configurations, wherein there is a predefined mapping between the received parameter value and the selected transmission configuration.
  • an apparatus comprising at least one processor and at least one memory including a computer program code, the at least one memory and computer program code configured to, with the at least one processor, cause the apparatus at least to determine at least one metric for transmission configuration selection, receive at least one parameter value associated with the at least one determined metric and determine a transmission configuration based on the at least one parameter value and at least one determined metric, wherein the transmission configuration operates without timing advance.
  • the apparatus may be configured to cause a signal to be transmitted using one of a plurality of bandwidth parts based on the determined transmission configuration, wherein each of the plurality of bandwidth parts is associated with one of a plurality of transmission configurations.
  • the apparatus may be configured to cause a signal to be transmitted using a zero tail discrete Fourier transform Spread orthogonal frequency division multiplexing, ZT-DFT-S-OFDM, symbol, wherein the number of resource elements allocated to zero tails is determined based on the determined transmission configuration.
  • ZT-DFT-S-OFDM discrete Fourier transform Spread orthogonal frequency division multiplexing
  • the transmission configuration may define at least one of subcarrier spacing and cyclic prefix length.
  • the at least one metric may comprise at least one of random access channel configuration and timing advance information.
  • the parameter value may comprise a random access channel configuration identifier.
  • the at least one parameter value may comprise a timing advance command.
  • the apparatus may be configured to select the determined transmission configuration from a plurality of transmission configurations, wherein there is a predefined mapping between the received parameter value and the selected transmission configuration.
  • an apparatus comprising at least one processor and at least one memory including a computer program code, the at least one memory and computer program code configured to, with the at least one processor, cause the apparatus at least to: provide, to a user equipment, at least one parameter value associated with at least one determined metric for transmission configuration selection, for use in determining a transmission configuration based on the at least one parameter value and at least one determined metric, wherein the transmission configuration operates without timing advance.
  • the apparatus may be configured to receive a signal from the user equipment using one of a plurality of bandwidth parts based on the determined transmission configuration, wherein each of the plurality of bandwidth parts is associated with one of a plurality of transmission configurations.
  • the apparatus may be configured to receive a signal from the user equipment using a zero tail discrete Fourier transform Spread orthogonal frequency division multiplexing, ZT-DFT-S- OFDM, symbol, wherein the number of resource elements allocated to zero tails is determined based on the determined transmission configuration.
  • the transmission configuration may define at least one of subcarrier spacing and cyclic prefix length.
  • the at least one metric may comprise at least one of random access channel configuration and timing advance information.
  • the parameter value may comprise a random access channel configuration identifier.
  • the at least one parameter value may comprise a timing advance command.
  • the determined transmission configuration may be selected from a plurality of transmission configurations, wherein there is a predefined mapping between the received parameter value and the selected transmission configuration.
  • a computer readable medium comprising program instructions for causing an apparatus to perform at least the following determining at least one metric for transmission configuration selection, receiving at least one parameter value associated with the at least one determined metric and determining a transmission configuration based on the at least one parameter value and at least one determined metric, wherein the transmission configuration operates without timing advance.
  • the apparatus may be caused to perform causing a signal to be transmitted using one of a plurality of bandwidth parts based on the determined transmission configuration, wherein each of the plurality of bandwidth parts is associated with one of a plurality of transmission configurations.
  • the apparatus may be caused to perform causing a signal to be transmitted using a zero tail discrete Fourier transform Spread orthogonal frequency division multiplexing, ZT-DFT-S- OFDM, symbol, wherein the number of resource elements allocated to zero tails is determined based on the determined transmission configuration.
  • ZT-DFT-S- OFDM discrete Fourier transform Spread orthogonal frequency division multiplexing
  • the transmission configuration may define at least one of subcarrier spacing and cyclic prefix length.
  • the at least one metric may comprise at least one of random access channel configuration and timing advance information.
  • the parameter value may comprise a random access channel configuration identifier.
  • the at least one parameter value may comprise a timing advance command.
  • the apparatus may be caused to perform selecting the determined transmission configuration from a plurality of transmission configurations, wherein there is a predefined mapping between the received parameter value and the selected transmission configuration.
  • a computer readable medium comprising program instructions for causing an apparatus to perform at least the following providing, to a user equipment, at least one parameter value associated with at least one determined metric for transmission configuration selection, for use in determining a transmission configuration based on the at least one parameter value and at least one determined metric, wherein the transmission configuration operates without timing advance.
  • the apparatus may be caused to perform receiving a signal from the user equipment using one of a plurality of bandwidth parts based on the determined transmission configuration, wherein each of the plurality of bandwidth parts is associated with one of a plurality of transmission configurations.
  • the apparatus may be caused to perform receiving a signal from the user equipment using a zero tail discrete Fourier transform Spread orthogonal frequency division multiplexing, ZT- DFT-S-OFDM, symbol, wherein the number of resource elements allocated to zero tails is determined based on the determined transmission configuration.
  • the transmission configuration may define at least one of subcarrier spacing and cyclic prefix length.
  • the at least one metric may comprise at least one of random access channel configuration and timing advance information.
  • the parameter value may comprise a random access channel configuration identifier.
  • the at least one parameter value may comprise a timing advance command.
  • the determined transmission configuration may be selected from a plurality of transmission configurations, wherein there is a predefined mapping between the received parameter value and the selected transmission configuration.
  • a ninth aspect there is provided a non-transitory computer readable medium comprising program instructions for causing an apparatus to perform at least the method according to the third aspect or a method according to the fourth aspect.
  • Figure 1 shows a schematic diagram of an example communication system comprising a base station and a plurality of communication devices
  • Figure 2 shows a schematic diagram of an example mobile communication device
  • Figure 3 shows a schematic diagram of an example control apparatus
  • Figure 4 shows a flowchart of a method according to an example embodiment
  • Figure 5 shows a block diagram of an example CP-ZT-DFT-S-OFDMA
  • Figure 6 shows a block diagram of resource element mapping in a DFT input.
  • a wireless communication system 100 such as that shown in figure 1
  • mobile communication devices or user equipment (UE) 102, 104, 105 are provided wireless access via at least one base station or similar wireless transmitting and/or receiving node or point.
  • Base stations are typically controlled by at least one appropriate controller apparatus, so as to enable operation thereof and management of mobile communication devices in communication with the base stations.
  • the controller apparatus may be located in a radio access network (e.g. wireless communication system 100) or in a core network (CN) (not shown) and may be implemented as one central apparatus or its functionality may be distributed over several apparatuses.
  • the controller apparatus may be part of the base station and/or provided by a separate entity such as a Radio Network Controller.
  • control apparatus 108 and 109 are shown to control the respective macro level base stations 106 and 107.
  • the control apparatus of a base station can be interconnected with other control entities.
  • the control apparatus is typically provided with memory capacity and at least one data processor.
  • the control apparatus and functions may be distributed between a plurality of control units. In some systems, the control apparatus may additionally or alternatively be provided in a radio network controller.
  • base stations 106 and 107 are shown as connected to a wider communications network 1 13 via gateway 112.
  • a further gateway function may be provided to connect to another network.
  • the smaller base stations 116, 118 and 120 may also be connected to the network 113, for example by a separate gateway function and/or via the controllers of the macro level stations.
  • the base stations 1 16, 118 and 120 may be pico or femto level base stations or the like. In the example, stations 116 and 118 are connected via a gateway 11 1 whilst station 120 connects via the controller apparatus 108. In some embodiments, the smaller stations may not be provided. Smaller base stations 116, 1 18 and 120 may be part of a second network, for example WLAN and may be WLAN APs.
  • the communication devices 102, 104, 105 may access the communication system based on various access techniques, such as code division multiple access (CDMA), or wideband CDMA (WCDMA).
  • CDMA code division multiple access
  • WCDMA wideband CDMA
  • Other non-limiting examples comprise time division multiple access (TDMA), frequency division multiple access (FDMA) and various schemes thereof such as the interleaved frequency division multiple access (IFDMA), single carrier frequency division multiple access (SC-FDMA) and orthogonal frequency division multiple access (OFDMA), space division multiple access (SDMA) and so on.
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • IFDMA interleaved frequency division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SDMA space division multiple access
  • LTE Long Term Evolution
  • UMTS Universal Mobile Telecommunications System
  • LTE-A LTE Advanced
  • E-UTRAN Evolved Universal Terrestrial Radio Access Network
  • EPC Evolved Packet Core
  • Base stations of such systems are known as evolved or enhanced Node Bs (eNBs) and provide E-UTRAN features such as user plane Packet Data Convergence/Radio Link Control/Medium Access Control/Physical layer protocol (PDCP/RLC/MAC/PHY) and control plane Radio Resource Control (RRC) protocol terminations towards the communication devices.
  • E-UTRAN features such as user plane Packet Data Convergence/Radio Link Control/Medium Access Control/Physical layer protocol (PDCP/RLC/MAC/PHY) and control plane Radio Resource Control (RRC) protocol terminations towards the communication devices.
  • Other examples of radio access system comprise those provided by base stations of systems that are based on technologies such as wireless local area network (WLAN) and/or WiMax (Worldwide Interoperability for Microwave Access).
  • WLAN wireless local area network
  • WiMax Worldwide Interoperability for Microwave Access
  • a base station can provide coverage for an entire cell or similar radio service area.
  • Core network elements include Mobility Management Entity (MME), Serving Gateway (S-
  • Network architecture in NR may be similar to that of LTE-advanced.
  • Base stations of NR systems may be known as next generation Node Bs (gNBs).
  • Changes to the network architecture may depend on the need to support various radio technologies and finer QoS support, and some on-demand requirements for e.g. QoS levels to support QoE of user point of view.
  • network aware services and applications, and service and application aware networks may bring changes to the architecture. Those are related to Information Centric Network (ICN) and User-Centric Content Delivery Network (UC-CDN) approaches.
  • ICN Information Centric Network
  • UC-CDN User-Centric Content Delivery Network
  • NR may use multiple input - multiple output (MIMO) antennas, many more base stations or nodes than the LTE (a so- called small cell concept), including macro sites operating in co-operation with smaller stations and perhaps also employing a variety of radio technologies for better coverage and enhanced data rates.
  • MIMO multiple input - multiple output
  • Future networks may utilise network functions virtualization (NFV) which is a network architecture concept that proposes virtualizing network node functions into“building blocks” or entities that may be operationally connected or linked together to provide services.
  • a virtualized network function (VNF) may comprise one or more virtual machines running computer program codes using standard or general type servers instead of customized hardware. Cloud computing or data storage may also be utilized.
  • radio communications this may mean node operations to be carried out, at least partly, in a server, host or node operationally coupled to a remote radio head. It is also possible that node operations will be distributed among a plurality of servers, nodes or hosts. It should also be understood that the distribution of labour between core network operations and base station operations may differ from that of the LTE or even be non-existent.
  • An example 5G core network comprises functional entities.
  • the CN is connected to a UE via the radio access network (RAN).
  • An UPF User Plane Function
  • PSA PDU Session Anchor
  • DN data network
  • PSA PDU Session Anchor
  • the UPF is controlled by an SMF (Session Management Function) that receives policies from a PCF (Policy Control Function).
  • SMF Session Management Function
  • PCF Policy Control Function
  • the CN may also include an AMF (Access & Mobility Function).
  • a possible mobile communication device will now be described in more detail with reference to Figure 2 showing a schematic, partially sectioned view of a communication device 200.
  • a communication device is often referred to as user equipment (UE) or terminal.
  • An appropriate mobile communication device may be provided by any device capable of sending and receiving radio signals.
  • Non-limiting examples comprise a mobile station (MS) or mobile device such as a mobile phone or what is known as a’smart phone’, a computer provided with a wireless interface card or other wireless interface facility (e.g., USB dongle), personal data assistant (PDA) or a tablet provided with wireless communication capabilities, or any combinations of these or the like.
  • a mobile communication device may provide, for example, communication of data for carrying communications such as voice, electronic mail (email), text message, multimedia and so on.
  • Non-limiting examples of these services comprise two-way or multi-way calls, data communication or multimedia services or simply an access to a data communications network system, such as the Internet. Users may also be provided broadcast or multicast data.
  • Non-limiting examples of the content comprise downloads, television and radio programs, videos, advertisements, various alerts and other information.
  • a mobile device is typically provided with at least one data processing entity 201 , at least one memory 202 and other possible components 203 for use in software and hardware aided execution of tasks it is designed to perform, including control of access to and communications with access systems and other communication devices.
  • the data processing, storage and other relevant control apparatus can be provided on an appropriate circuit board and/or in chipsets. This feature is denoted by reference 204.
  • the user may control the operation of the mobile device by means of a suitable user interface such as key pad 205, voice commands, touch sensitive screen or pad, combinations thereof or the like.
  • a display 208, a speaker and a microphone can be also provided.
  • a mobile communication device may comprise appropriate connectors (either wired or wireless) to other devices and/or for connecting external accessories, for example hands-free equipment, thereto.
  • the mobile device 200 may receive signals over an air or radio interface 207 via appropriate apparatus for receiving and may transmit signals via appropriate apparatus for transmitting radio signals.
  • transceiver apparatus is designated schematically by block 206.
  • the transceiver apparatus 206 may be provided for example by means of a radio part and associated antenna arrangement.
  • the antenna arrangement may be arranged internally or externally to the mobile device.
  • Figure 3 shows an example of a control apparatus for a communication system, for example to be coupled to and/or for controlling a station of an access system, such as a RAN node, e.g. a base station, eNB or gNB, a relay node or a core network node such as an MME or S- GW or P-GW, or a core network function such as AMF/SMF, or a server or host.
  • a RAN node e.g. a base station, eNB or gNB
  • a relay node or a core network node such as an MME or S- GW or P-GW
  • a core network function such as AMF/SMF
  • the method may be implanted in a single control apparatus or across more than one control apparatus.
  • the control apparatus may be integrated with or external to a node or module of a core network or RAN.
  • base stations comprise a separate control apparatus unit or module.
  • control apparatus can be another network element such as a radio network controller or a spectrum controller.
  • each base station may have such a control apparatus as well as a control apparatus being provided in a radio network controller.
  • the control apparatus 300 can be arranged to provide control on communications in the service area of the system.
  • the control apparatus 300 comprises at least one memory 301 , at least one data processing unit 302, 303 and an input/output interface 304. Via the interface the control apparatus can be coupled to a receiver and a transmitter of the base station.
  • the receiver and/or the transmitter may be implemented as a radio front end or a remote radio head.
  • Embodiments may be applied to various NR aspects including 5G machine type communication (MTC)/lnternet of Things (loT), 2 step random access channel (RACH), non-orthogonal multiple access (NOMA), “ultra-reliability by means of multipoint reception” and machine-to-machine
  • MTC machine type communication
  • LoT 2 step random access channel
  • NOMA non-orthogonal multiple access
  • M2M device-to-device
  • D2D device-to-device
  • a timing advance (TA) procedure is used, e.g., in the case of mobile broadband service.
  • TA may mean that UL transmissions from different users arrive at the base station essentially within the cyclic prefix (CP).
  • CP cyclic prefix
  • Such uplink synchronization may avoid interference between the users with uplink transmissions occupying on the same OFDM/DFT-S-OFDM symbol.
  • Such interference may happen, e.g., in the case when UEs are multiplexed by means of FDM (frequency division multiplexing), CDM (code division multiplexing) and/or SDM (spatial division multiplexing) within the same OFDM/DFT -S-OFDM symbol.
  • FDM frequency division multiplexing
  • CDM code division multiplexing
  • SDM spatial division multiplexing
  • the TA procedure may be beneficial in typical mobile broadband scenarios. However, in some MTC scenarios it may be problematic.
  • UL synchronization may result in latency increase. Maintaining UL timing advance may increase power consumption (e.g., at the UE end) and increase the system overhead in both UL (signal facilitating TA measurement) and DL (TA update signalling). UL synchronization within CP may not be possible with geometrically separated receivers (that is, it may be possible to align the Rx timing only for a single receive).
  • Asynchronous communication allows UEs to transmit data without timing advance (TA).
  • 5G MTC/loT may focus on higher data rates compared to scenarios covered by (LTE) NB-loT and eMTC.
  • the use of asynchronous UL communication may reduce latency and power communication. Furthermore, it may reduce the system overhead in both UL and DL.
  • asynchronous communication in NR Release 15 UL may increase gNB complexity.
  • a gNB may need a separate FFT/receiver for each UE. This may add to gNB complexity and cost.
  • the cyclic prefix (CP) needs to cover both 2-way propagation delay and the channel delay spread.
  • Table 1 summarises CP lengths which may be supported by NR when operating at carrier frequencies below 7 GHz.
  • the maximum cell radius for 15 kHz subcarrier spacing (SCS) is about 500m, and 200m for 30 kHz SCS, respectively.
  • SCS subcarrier spacing
  • the maximum cell radius supported without TA may be around 2.5 km.
  • the 3.75 kHz with extended CP may supports cell radius up to 10 km.
  • Table 2 shows the PRACH formats supported by NR for different cell radius.
  • the PRACH preamble configuration to use is provided to the UE in the system information (SIB1 ).
  • Table 3 shows the supported transmission numerologies (SCS and CP values) supported in NR.
  • BWP serving cell adaptive bandwidth
  • a UE is instructed to operate on a specific part of gNB’s BW, that is, on a BWP.
  • BWPs Up to 4 BWPs may be configured separately for UL and DL.
  • the majority of RRC parameters in NR are configured on a BWP, each BWP can have e.g.
  • subcarrier spacing SCS
  • cyclic prefix BW in terms of contiguous PRBs as well as location of the BW in the cell’s total BW, K0, K1 and K2 values defining the time offsets from DL assignment reception to the beginning of PDSCH, from the end of PDSCH to HARQ- ACK transmission time, and from UL grant reception to the start of PUSCH transmission, respectively.
  • UL and DL BWPs may be paired, in which case the centre frequency of both BWPs is the same.
  • One of the BWPs may be defined as default BWP e.g. to facilitate UE battery saving.
  • a UE may have only one BWP active at a time.
  • the active BWP may be indicated by a field in the DCI or by RRC signalling.
  • BWP switching occurs after UE has received the signalling changing the active BWP, but switching time is yet to be determined.
  • UE may also fall-back to default BWP after a configured period of inactivity.
  • An apparatus may generate a zero-tail signal to be transmitted in an LTE/LTE-A/NR cell, by introducing time domain samples with zero power or very low power in specific positions of a time symbol tail.
  • the apparatus may transmit the generated zero-tail signal to a base station, such that a first user terminal is located in the cell farther away (e.g. on a cell edge) from the base station than a second user terminal.
  • a first user terminal is located in the cell farther away (e.g. on a cell edge) from the base station than a second user terminal.
  • the amount of the zero power or very low power samples is dependent on a distance between the communication devices, a cell size of the cell which a communication device is connected to or synchronization accuracy between the communication devices. How a UE is aware about distance between
  • Figure 4 shows a flowchart of a method which may provide support for asynchronous UL using single, or very few, FFT (fast fourier transform) for reception at a gNB.
  • the method may be performed at a user equipment.
  • the method comprises determining at least one metric for transmission configuration selection.
  • the method comprises receiving at least one parameter value associated with the at least one determined metric.
  • the method comprises determining a transmission configuration based on the at least one parameter value and at least one determined metric, wherein the transmission configuration operates without timing advance.
  • a method in accordance with the invention which may be performed at network entity, e.g. a gNB, may comprise providing to a user equipment, at least one parameter value associated with at least one determined metric for transmission configuration selection, for use in determining a transmission configuration based on the at least one parameter value and at least one determined metric, wherein the at least one transmission configuration operates without timing advance.
  • network entity e.g. a gNB
  • the transmission configuration may define at least one of subcarrier spacing (SCS) and cyclic prefix (CP) length.
  • SCS subcarrier spacing
  • CP cyclic prefix
  • the at least one metric may comprises at least one of random access channel configuration and timing advance information.
  • the at least one parameter value may be received from a network.
  • the parameter value comprises a random access channel configuration identifier (e.g. RACH format ID). This may be obtained from system information broadcasted in the cell.
  • the at least one metric comprises timing advance information
  • the at least one parameter value comprises a timing advance command.
  • Two use cases are considered: when the UL timing measurement information is unavailable and when the UL timing measurement information is available. UL timing measurement may be considered unavailable e.g. if it is outdated.
  • the transmission configuration (SCS and/or CP) may be determined based on the random access channel (e.g., PRACH) configuration.
  • the first case may be used e.g. in the 2 step RACH process.
  • the transmission configuration (CP or/and SCS) may be determined based on timing advance command(s) or/and based on PRACH configuration.
  • the metric may be provided to a UE by a network.
  • the PRACH configuration is provided to the UE in system information.
  • Determining the transmission configuration based on TA commands may be feasible e.g. for multipoint reception and/or D2D scenarios.
  • the TA based approach may allow for better granularity in optimizing the CP needed for each UE.
  • One approach may be to determine TA from the RAR message (Random access response, a.k.a. Random Access Message 2) send by the base station as response to the random access preamble (Random Access Message 1).
  • Each BWP may have separately configured SCS and/or CP length.
  • the determined transmission configuration (e.g., CP length) may be implemented using different BWPs.
  • the method may comprise causing a signal to be transmitted to a network using one of a plurality of bandwidth parts based on the determined transmission configuration, wherein each of the plurality of bandwidth parts is associated with one of a plurality of transmission configurations.
  • each BWP may be associated with a different CP length.
  • Multiple BWPs are configured for UL.
  • the SCS and CP of the first BWP are configured according to maximum cell radius supported by PRACH format (see Table 3) and the CP of second BWP is configured for shorter CP.
  • PRACH format C2 cell radius 9.2km
  • a first BWP is configured to 3.75 kHz SCS with extended CP to support similar cell radius with PRACH format (see calculation in introduction section) and second BWP is configured to 15 kHz SCS with normal CP.
  • the UE uses a first BWP when UL timing measurement is not available (or is outdated) and a second BWP when UL measurement is available.
  • the determined transmission configuration (e.g., CP length) may be implemented using ZT-DFT-S-OFDM. That is, the method may comprise causing a signal to be transmitted using a ZT-DFT-S-OFDM, symbol, wherein the number of resource elements allocated to zero tails is determined based on the determined transmission configuration.
  • Figure 5 shows an example of the principle behind CP ZT-DFT-S-OFDM.
  • Zero Tail acts as additional CP.
  • the purpose of the CP block is to provide a full PRB level coexistence between the new formats (CP ZT DFT-S-OFDM) and existing formats (i.e. NR Rel-15 based on DFT- S-OFDMA or CP-OFDMA).
  • the amount and location of the zero power REs in the DFT input may be controlled.
  • T is number of zero tail REs
  • N H is number of head REs
  • ND is number of data REs
  • N s is the DFT size.
  • the amount of zero tails REs NT may be defined based on PRACH configuration, subcarrier spacing and/or resource allocation granularity in frequency.
  • the amount of zero tail REs NT may be defined based on timing advance command(s) or/and based on PRACH configuration.
  • a UE may be configured with a plurality of transmission configurations. Determining the transmission configuration may comprise selecting a transmission configuration from the plurality of transmission configurations. There may be a predefined mapping between the received parameter value and the selected transmission configuration.
  • TA classes may be predefined by a minimum TA and a maximum TA. Each TA class may be mapped to (associated with) a CP length value.
  • An example of the mapping is provided below:
  • a transmission configuration may be mapped to a RACH format ID.
  • mapping e.g., TA classes and corresponding CP
  • TA classes and corresponding CP may be predefined in the specification, or they may be configured by means of RRC signalling.
  • the TA class may be determined by the maximum
  • the predefined TA classes may be mapped to the amount of zero tail REs.
  • the TA classes and corresponding zero tail REs may be predefined in the specification, or they can be configured by means of RRC signalling.
  • An example of the classification is depicted below, where a, b and c are predefined integers:
  • data REs may be allocated in a sparse manner in time.
  • the number of data REs ND is set smaller than the size of DFT input Ns.
  • NH and L/r may be UE-specific
  • UE may select NH and Nt autonomously based on predefined
  • a method as described above with reference to Figures 4 to 6 may allow a UE to transmit data without being scheduled by network.
  • both UE and Network needs to be aware about CP length and subcarrier spacing.
  • the NW is aware.
  • CP length and SCS are tied to the PRACH format.
  • the PRACH format is configured by NW.
  • the NW (gNB) is aware of the predefined mapping.
  • An apparatus may comprise means determining at least one metric for transmission configuration selection, receiving at least one parameter value associated with the at least one determined metric and determining a transmission configuration based on the at least one parameter value and at least one determined metric, wherein the transmission configuration operates without timing advance.
  • an apparatus may comprise means for providing, to a user equipment, at least one parameter value associated with at least one determined metric for transmission configuration selection, for use in determining a transmission configuration based on the at least one parameter value and at least one determined metric, wherein the transmission configuration operates without timing advance.
  • apparatuses may comprise or be coupled to other units or modules etc., such as radio parts or radio heads, used in or for transmission and/or reception.
  • apparatuses have been described as one entity, different modules and memory may be implemented in one or more physical or logical entities.
  • the embodiments of this invention may be implemented by computer software executable by a data processor of the mobile device, such as in the processor entity, or by hardware, or by a combination of software and hardware.
  • Computer software or program also called program product, including software routines, applets and/or macros, may be stored in any apparatus- readable data storage medium and they comprise program instructions to perform particular tasks.
  • a computer program product may comprise one or more computer-executable components which, when the program is run, are configured to carry out embodiments.
  • the one or more computer-executable components may be at least one software code or portions of it.
  • any blocks of the logic flow as in the Figures may represent program steps, or interconnected logic circuits, blocks and functions, or a combination of program steps and logic circuits, blocks and functions.
  • the software may be stored on such physical media as memory chips, or memory blocks implemented within the processor, magnetic media such as hard disk or floppy disks, and optical media such as for example DVD and the data variants thereof, CD.
  • the physical media is a non-transitory media.
  • the memory may be of any type suitable to the local technical environment and may be implemented using any suitable data storage technology, such as semiconductor based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory.
  • the data processors may be of any type suitable to the local technical environment, and may comprise one or more of general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs), application specific integrated circuits (ASIC), FPGA, gate level circuits and processors based on multi core processor architecture, as non-limiting examples.
  • Embodiments of the inventions may be practiced in various components such as integrated circuit modules.
  • the design of integrated circuits is by and large a highly automated process. Complex and powerful software tools are available for converting a logic level design into a semiconductor circuit design ready to be etched and formed on a semiconductor substrate.

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

Abstract

L'invention concerne un appareil, ledit appareil comprenant des moyens pour déterminer au moins une métrique pour une sélection de configuration de transmission, recevoir au moins une valeur de paramètre associée à la ou aux métriques déterminées et déterminer une configuration de transmission sur la base de la ou des valeurs de paramètre et d'au moins une métrique déterminée, la configuration de transmission fonctionnant sans avance temporelle.
PCT/EP2018/071826 2018-08-10 2018-08-10 Appareil, procédé et programme informatique WO2020030290A1 (fr)

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