WO2014110757A1 - Procédé et appareil servant à faciliter une granularité étendue en domaine temporel pour saut de fréquence en liaison montante - Google Patents

Procédé et appareil servant à faciliter une granularité étendue en domaine temporel pour saut de fréquence en liaison montante Download PDF

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Publication number
WO2014110757A1
WO2014110757A1 PCT/CN2013/070602 CN2013070602W WO2014110757A1 WO 2014110757 A1 WO2014110757 A1 WO 2014110757A1 CN 2013070602 W CN2013070602 W CN 2013070602W WO 2014110757 A1 WO2014110757 A1 WO 2014110757A1
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WIPO (PCT)
Prior art keywords
frequency hopping
subframes
indication
subframe
transmission time
Prior art date
Application number
PCT/CN2013/070602
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English (en)
Inventor
Shuang TAN
Erlin Zeng
Chunyan Gao
Na WEI
Wei Bai
Haiming Wang
Original Assignee
Broadcom Corporation
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 Broadcom Corporation filed Critical Broadcom Corporation
Priority to PCT/CN2013/070602 priority Critical patent/WO2014110757A1/fr
Publication of WO2014110757A1 publication Critical patent/WO2014110757A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/713—Spread spectrum techniques using frequency hopping
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H04L5/0012—Hopping in multicarrier systems

Definitions

  • Embodiments of the present invention relate generally to wireless communications technology and, more particularly, to a method and apparatus for an enhancement of frequency hopping with transmission time interval bundling in a communications system.
  • the communications between a mobile terminal and a serving cell may sometimes affect resource utilization, throughput, latency and coverage.
  • the category 1 UEs may be the lowest level
  • PUSCH Physical Uplink Shared Channel
  • FDD Freplexing
  • low-cost MTC devices e.g., low cost MTC UEs (e.g., metering devices)
  • MTC UEs e.g., metering devices
  • a method, apparatus and computer program product are therefore provided according to an example embodiment in order to provide an efficient and reliable manner for providing an enhancement of frequency hopping with transmission time interval (TTI) bundling on an uplink channel (e.g., PUSCH), targeting coverage improvement for low- cost machine type communications (MTC) at extremely low signal-to-noise ratio (SNR) in a communications system (e.g., Long-Term Evolution (LTE), LTE- Advanced).
  • TTI transmission time interval
  • MTC low- cost machine type communications
  • SNR signal-to-noise ratio
  • the time-domain granularity of PUSCH frequency hopping may be extended, by a network device (e.g., an evolved Node B (eNB)) to more than one subframe, in an instance in which a long transmission time interval (TTI) bundling may be utilized under a very low SNR scenario.
  • a network device e.g., an evolved Node B (eNB)
  • eNB evolved Node B
  • TTI transmission time interval
  • some example embodiments may provide the benefits of both cross-subframe channel estimation and frequency hopping for PUSCH transmission for low-cost MTC devices at low SNR.
  • a method in one example embodiment, includes extending a frequency hopping time-domain granularity for a Physical Uplink Shared Channel to a number of subframes greater than one subframe.
  • the method of this embodiment also includes enabling provision of a generated indication identifying the extended frequency hopping time-domain granularity to at least one communication device to enable the communication device to perform frequency hopping for the number of subframes greater than one subframe.
  • an apparatus in another example embodiment, includes at least one processor and at least one memory including computer program code with the at least one memory and computer program code being configured to, with the processor, cause the apparatus to at least extend a frequency hopping time-domain granularity for a Physical Uplink Shared Channel to a number of subframes greater than one subframe.
  • the at least one memory and the computer program code of this embodiment are also configured to, with the processor, cause the apparatus to enable provision of a generated indication identifying the extended frequency hopping time-domain granularity to at least one communication device to enable the communication device to perform frequency hopping for the number of subframes greater than one subframe.
  • a computer program product includes at least one computer-readable storage medium having computer-readable program instructions stored therein with the computer-readable program instructions including program instructions configured to extend a frequency hopping time-domain granularity for a Physical Uplink Shared Channel to a number of subframes greater than one subframe.
  • the computer-readable program instructions of this embodiment also include program instructions configured to enable provision of a generated indication identifying the extended frequency hopping time-domain granularity to at least one communication device to enable the communication device to perform frequency hopping for the number of subframes greater than one subframe.
  • an apparatus in yet another example embodiment, includes means for extending a frequency hopping time-domain granularity for a Physical Uplink Shared Channel to a number of subframes greater than one subframe.
  • the apparatus of this embodiment also includes means for enabling provision of a generated indication identifying the extended frequency hopping time-domain granularity to at least one communication device to enable the communication device to perform frequency hopping for the number of subframes greater than one subframe.
  • a method in a further example embodiment, includes receiving, from a network device, an indication of an extended frequency hopping time-domain granularity for a Physical Uplink Shared Channel denoting a number of subframes greater than one subframe. The method of this embodiment also includes performing frequency hopping for the number of subframes greater than one subframe.
  • an apparatus in yet another example embodiment, includes at least one processor and at least one memory including computer program code with the at least one memory and the computer program code being configured to, with the processor, cause the apparatus to at least receive, from a network device, an indication of an extended frequency hopping time-domain granularity for a Physical Uplink Shared Channel denoting a number of subframes greater than one subframe.
  • the at least one memory and the computer program code of this embodiment are also configured to, with the processor, cause the apparatus to perform frequency hopping for the number of subframes greater than one subframe.
  • a computer program product includes at least one computer-readable storage medium having computer-readable program instructions stored therein with the computer-readable program instructions including program instructions configured to cause receipt, from a network device, of an indication of an extended frequency hopping time-domain granularity for a Physical Uplink Shared Channel denoting a number of subframes greater than one subframe.
  • the computer-readable program instructions of this embodiment also include program instructions configured to perform frequency hopping for the number of subframes greater than one subframe.
  • an apparatus is provided that includes means for receiving, from a network device, an indication of an extended frequency hopping time- domain granularity for a Physical Uplink Shared Channel denoting a number of subframes greater than one subframe.
  • the apparatus of this embodiment also includes performing frequency hopping for the number of subframes greater than one subframe.
  • FIG. 1 is a schematic representation of a system that may benefit from an embodiment of the present invention
  • FIG. 2 is a schematic block diagram of an apparatus from the perspective of a base station in accordance with an example embodiment of the invention
  • FIG. 3 is a block diagram of an apparatus that may be embodied by a mobile terminal in accordance with one embodiment of the present invention
  • FIG. 4 is a diagram of a table according to an example embodiment of the invention.
  • FIG. 5 is a diagram illustrating low cost MTC performance according to an example embodiment of the invention.
  • FIG. 6 is a diagram of a table according to one example embodiment of the invention.
  • FIG. 7 is a diagram of another table according to another example embodiment of the invention.
  • FIG. 8 is a flowchart illustrating operations performed in accordance with one embodiment of the present invention.
  • FIG. 9 illustrates the flowchart of operations performed in accordance with another embodiment of the present invention.
  • circuitry refers to all of the following: (a) hardware-only circuit implementations (such as implementations in only analog and/or digital circuitry) and (b) to combinations of circuits and software (and/or firmware), such as (as applicable): (i) to a combination of processor(s) or (ii) to portions of
  • processor(s)/software including digital signal processor(s)), software, and memory(ies) that work together to cause an apparatus, such as a mobile phone or server, to perform various functions) and (c) to circuits, such as a microprocessor(s) or a portion of a microprocessor(s), that require software or firmware for operation, even if the software or firmware is not physically present.
  • circuitry would also cover an implementation of merely a processor (or multiple processors) or portion of a processor and its (or their) accompanying software and/or firmware.
  • circuitry would also cover, for example and if applicable to the particular claim element, a baseband integrated circuit or application specific integrated circuit for a mobile phone or a similar integrated circuit in server, a cellular network device, or other network device.
  • a transmission time interval may, but need not, denote a resource(s) or parameter(s) that provides a duration for transmission of data on a radio link, channel or the like.
  • frequency hopping may, but need not, denote a radio communication process that may rapidly switch a carrier among multiple frequency channels to transfer information.
  • information may be transmitted over assigned and constantly changing frequency channels.
  • FIG. 1 a system according to an example embodiment is provided.
  • the system of FIG. 1 which includes a first communication device (e.g., mobile terminal 10), a second communication device (e.g., mobile terminal 10') that is capable of communication via a serving cell 12, such as a base station, a Node B, an evolved Node B (eNB), a radio network controller (RNC) or other access point, with a network 14 (e.g., a core network).
  • a serving cell 12 such as a base station, a Node B, an evolved Node B (eNB), a radio network controller (RNC) or other access point
  • RNC radio network controller
  • LTE Long Term Evolution
  • LTE-A LTE-Advance
  • other networks may support the method, apparatus and computer program product of embodiments of the present invention including those configured in accordance with wideband code division multiple access (W-CDMA), CDMA2000, global system for mobile communications (GSM), general packet radio service (GPRS) and/or the like.
  • W-CDMA wideband code division multiple access
  • CDMA2000 CDMA2000
  • GSM global system for mobile communications
  • GPRS general packet radio service
  • the network 14 may include a collection of various different nodes, devices or functions that may be in communication with each other via corresponding wired and/or wireless interfaces.
  • the network may include one or more cells, including serving cell 12 and one or more neighbor cells 16 (designated neighbor cell 1, neighbor cell 2, ... neighbor cell n in the embodiment of FIG. 1), each of which may serve a respective coverage area.
  • the serving cell and the neighbor cells could be, for example, part of one or more cellular or mobile networks or public land mobile networks (PLMNs).
  • PLMNs public land mobile networks
  • processing devices e.g., personal computers, server computers or the like
  • Communication devices such as the mobile terminal 10 (also referred to herein as user equipment (UE) 10), and/or the mobile terminal 10' (also referred to herein as UE 10') may be in communication with other communication devices or other devices via the serving cell 12 and, in turn, the network 14.
  • the communication devices may include an antenna for transmitting signals to and for receiving signals from a serving cell.
  • the mobile terminal 10 may be a mobile communication device such as, for example, a mobile telephone, portable digital assistant (PDA), pager, laptop computer, or any of numerous other hand held or portable communication devices, computation devices, content generation devices, content consumption devices, or combinations thereof.
  • the mobile terminal 10' may be a limited-bandwidth device(s) such as, for example, machine-type communications (MTC) device which may communicate through a network 14 without human intervention.
  • MTC machine-type communications
  • the mobile terminal 10' may be operated in part with human intervention.
  • the mobile terminal 10' may be a mobile communication device such as, for example, a sensor(s), a metering device(s) (e.g., gas meter, temperature meter, electricity meter, etc.).
  • the mobile terminal 10' (also referred to herein as MTC UE 10' or low cost MTC UE 10') may be a MTC device configured to operate according to a low cost and/or low data rate.
  • the mobile terminal 10, and/or mobile terminal 10' may include one or more processors that may define processing circuitry either alone or in combination with one or more memories.
  • the processing circuitry may utilize instructions stored in the memory to cause the mobile terminal 10 to operate in a particular way or execute specific functionality when the instructions are executed by the one or more processors.
  • the mobile terminal 10 and/or mobile terminal 10' may also include communication circuitry and corresponding hardware/software to enable communication with other devices and/or the network 14.
  • a neighbor cell 16 also referred to herein as target cell 16 and/or the serving cell 12 (also referred to herein as evolved node B (eNB) 12) may be embodied as or otherwise include an apparatus 20 as generically represented by the block diagram of FIG. 2.
  • the mobile terminal 10 and/or mobile terminal 10' may be embodied as or otherwise include an apparatus 30 as generically represented by the block diagram of FIG. 3.
  • the apparatus 20 may be employed, for example, by a serving cell 12, or a neighbor cell 16 and the apparatus 30 may be employed, for example, by a mobile terminal 10, it should be noted that the components, devices or elements described below may not be mandatory and thus some may be omitted in certain embodiments. Additionally, some embodiments may include further or different components, devices or elements beyond those shown and described herein.
  • a neighbor cell 16 (also referred to herein as target cell 16) and/or the serving cell 12 may be embodied as or otherwise include an apparatus 20 as generically represented by the block diagram of FIG. 2.
  • the mobile terminal 10, and/or mobile terminal 10' may be embodied as or otherwise include an apparatus 30 as generically represented by the block diagram of FIG. 3.
  • the apparatus 20 may be employed, for example, by a serving cell 12, or a neighbor cell 16 and the apparatus 30 may be employed, for example, by a mobile terminal 10, and/or mobile terminal 10' it should be noted that the components, devices or elements described below may not be mandatory and thus some may be omitted in certain embodiments. Additionally, some embodiments may include further or different components, devices or elements beyond those shown and described herein.
  • the apparatus 20 may include or otherwise be in
  • the processing circuitry may be configured to perform data processing, application execution and/or other processing and management services according to an example embodiment of the invention.
  • the apparatus or the processing circuitry may be embodied as a chip or chip set.
  • the apparatus or the processing circuitry may comprise one or more physical packages (e.g., chips) including materials, components and/or wires on a structural assembly (e.g., a baseboard).
  • the structural assembly may provide physical strength, conservation of size, and/or limitation of electrical interaction for component circuitry included thereon.
  • the apparatus or the processing circuitry may therefore, in some cases, be configured to implement an embodiment of the present invention on a single chip or as a single "system on a chip.”
  • a chip or chipset may constitute means for performing one or more operations for providing the functionalities described herein.
  • the processing circuitry 22 may include a processor 24 and memory 26 that may be in communication with or otherwise control a device interface 28.
  • the processing circuitry may be embodied as a circuit chip (e.g., an integrated circuit chip) configured (e.g., with hardware, software or a combination of hardware and software) to perform operations described herein in relation to the apparatus 20.
  • the device interface 28 may include one or more interface mechanisms for enabling communication with other devices, such as one or more mobile terminals 10.
  • the device interface may be any means such as a device or circuitry embodied in either hardware, or a combination of hardware and software that is configured to receive and/or transmit data from/to a network and/or any other device or module in
  • the device interface may include, for example, an antenna (or multiple antennas) and supporting hardware and/or software for enabling communications with a wireless communication network and/or a communication modem, such as a cellular modem 21 (e.g., a UMTS modem), and/or an optional non-cellular modem 23 (e.g., a WiFi modem, WLAN modem, etc.) for enabling communications with other terminals (e.g., WiFi terminals, WLAN terminals, APs, etc).
  • a wireless communication network e.g., a cellular modem 21 (e.g., a UMTS modem), and/or an optional non-cellular modem 23 (e.g., a WiFi modem, WLAN modem, etc.) for enabling communications with other terminals (e.g., WiFi terminals, WLAN terminals, APs, etc).
  • a communication modem such as a cellular modem 21 (e.g., a UMTS modem), and/or an optional non-cellular
  • the memory 26 may include one or more non- transitory memory devices such as, for example, volatile and/or non- volatile memory that may be either fixed or removable.
  • the memory may be configured to store information, data, applications, instructions or the like for enabling the apparatus 20 to carry out various functions in accordance with example embodiments of the present invention.
  • the memory could be configured to buffer input data for processing by the processor 24.
  • the memory could be configured to store instructions for execution by the processor.
  • the memory may include one of a plurality of databases that may store a variety of files, contents or data sets. Among the contents of the memory, applications may be stored for execution by the processor in order to carry out the functionality associated with each respective application.
  • the memory may be in communication with the processor via a bus for passing information among components of the apparatus.
  • the processor 24 may be embodied in a number of different ways.
  • the processor may be embodied as various processing means such as one or more of a microprocessor or other processing element, a coprocessor, a controller or various other computing or processing devices including integrated circuits such as, for example, an ASIC (application specific integrated circuit), an FPGA (field programmable gate array), or the like.
  • the processor may be configured to execute instructions stored in the memory 26 or otherwise accessible to the processor.
  • the processor may represent an entity (e.g., physically embodied in circuitry - in the form of processing circuitry 22) capable of performing operations according to embodiments of the present invention while configured accordingly.
  • the processor when the processor is embodied as an ASIC, FPGA or the like, the processor may be specifically configured hardware for conducting the operations described herein.
  • the processor when the processor is embodied as an executor of software instructions, the instructions may specifically configure the processor to perform the operations described herein.
  • the mobile terminals 10 may be embodied as or otherwise include an apparatus 30 as generically represented by the block diagram of FIG. 3.
  • the apparatus may be configured to provide for communications with the eNB 12 or another terminal(s) via communications system (e.g., a LTE system, a LTE-Advanced system).
  • communications system e.g., a LTE system, a LTE-Advanced system.
  • the apparatus may be employed, for example, by a mobile terminal, it should be noted that the components, devices or elements described below may not be mandatory and thus some may be omitted in certain embodiments. Additionally, some embodiments may include further or different components, devices or elements beyond those shown and described herein.
  • the apparatus 30 may include or otherwise be in communication with processing circuitry 32 that is configurable to perform actions in accordance with example embodiments described herein.
  • the processing circuitry may be configured to perform data processing, application execution and/or other processing and management services according to an example embodiment of the present invention.
  • the apparatus or the processing circuitry may be embodied as a chip or chip set.
  • the apparatus or the processing circuitry may comprise one or more physical packages (e.g., chips) including materials, components and/or wires on a structural assembly (e.g., a baseboard).
  • the structural assembly may provide physical strength, conservation of size, and/or limitation of electrical interaction for component circuitry included thereon.
  • the apparatus or the processing circuitry may therefore, in some cases, be configured to implement an embodiment of the present invention on a single chip or as a single "system on a chip.”
  • a chip or chipset may constitute means for performing one or more operations for providing the
  • the processing circuitry 32 may include a processor 34 and memory 36 that may be in communication with or otherwise control a device interface 38 and, in some cases, a user interface 44.
  • the processing circuitry may be embodied as a circuit chip (e.g., an integrated circuit chip) configured (e.g., with hardware, software or a combination of hardware and software) to perform operations described herein.
  • the processing circuitry may be embodied as a portion of a mobile computing device or other mobile terminal.
  • the optional user interface 44 may be in communication with the processing circuitry 32 to receive an indication of a user input at the user interface and/or to provide an audible, visual, mechanical or other output to the user.
  • the user interface in the context of a mobile terminal may include, for example, a keyboard, a mouse, a joystick, a display, a touch screen, a microphone, a speaker, and/or other input/output mechanisms.
  • the device interface 38 may include one or more interface mechanisms for enabling communication with other devices and/or networks.
  • the device interface may be any means such as a device or circuitry embodied in either hardware, or a combination of hardware and software that is configured to receive and/or transmit data from/to a network and/or any other device or module in communication with the processing circuitry 32.
  • the device interface may include, for example, an antenna (or multiple antennas) and supporting hardware and/or software for enabling communications with a wireless communication network and/or a communication modem or other hardware/software for supporting communication via cable, digital subscriber line (DSL), universal serial bus (USB), Ethernet or other methods.
  • DSL digital subscriber line
  • USB universal serial bus
  • the device interface includes a cellular modem 40 (e.g., a UMTS modem) for supporting communications with the eNB 12 and an optional non- cellular modem 42 (e.g., a WiFi modem, WLAN modem, Bluetooth (BT) modem, etc.) for supporting communications with other terminals (e.g., a WiFi station(s), a WLAN station(s)), etc.).
  • a cellular modem 40 e.g., a UMTS modem
  • an optional non- cellular modem 42 e.g., a WiFi modem, WLAN modem, Bluetooth (BT) modem, etc.
  • BT Bluetooth
  • the memory 36 may include one or more non- transitory memory devices such as, for example, volatile and/or non- volatile memory that may be either fixed or removable.
  • the memory may be configured to store information, data, applications, instructions or the like for enabling the apparatus 30 to carry out various functions in accordance with example embodiments of the present invention.
  • the memory could be configured to buffer input data for processing by the processor 34.
  • the memory could be configured to store instructions for execution by the processor.
  • the memory may include one of a plurality of databases that may store a variety of files, contents or data sets. Among the contents of the memory, applications may be stored for execution by the processor in order to carry out the functionality associated with each respective application.
  • the memory may be in communication with the processor via a bus for passing information among components of the apparatus.
  • the processor 34 may be embodied in a number of different ways.
  • the processor may be embodied as various processing means such as one or more of a microprocessor or other processing element, a coprocessor, a controller or various other computing or processing devices including integrated circuits such as, for example, an ASIC, an FPGA or the like.
  • the processor may be configured to execute instructions stored in the memory 36 or otherwise accessible to the processor.
  • the processor may represent an entity (e.g., physically embodied in circuitry - in the form of processing circuitry 32) capable of performing operations according to embodiments of the present invention while configured accordingly.
  • the processor when the processor is embodied as an ASIC, FPGA or the like, the processor may be specifically configured hardware for conducting the operations described herein.
  • the processor when the processor is embodied as an executor of software instructions, the instructions may specifically configure the processor to perform the operations described herein.
  • repetition and retransmission may be useful schemes for coverage improvement of data channels, which may achieve much lower effective coding rate, although power boosting, beamforming, inter-cell coordination and interference
  • TTI bundling has been introduced to improve uplink coverage at cell edge or in poor radio conditions supporting Voice over Internet Protocol (VoIP) (utilized by legacy VoIP UEs (e.g., category 1 UEs)) in which different redundancy versions (RVs) of the same set of coded bits may be transmitted in four consecutive TTIs.
  • VoIP Voice over Internet Protocol
  • RVs redundancy versions
  • TTI bundling may also be utilized with an even longer bundling duration, for example, 1,000 TTI bundling, in order to achieve the significantly low operation SNR.
  • HARQ may not be desired, as HARQ ACK/NACK may consume a large downlink control resource and may lead to a long delay.
  • Frequency hopping may be another beneficial technique utilized in LTE uplink transmission. Utilizing frequency hopping may enable a UE to exploit the frequency diversity of a wideband channel used in LTE while keeping a required contiguous allocation.
  • the LTE standard currently allows two modes for frequency hopping, enabled by higher layer signaling, from one to the other time slot (e.g., intra- subframe) or from one to the other subframe (e.g., inter- subframe). For low-cost MTC coverage, frequency hopping may also be utilized as a starting point.
  • a processor e.g., processor 24 of a network device (e.g., eNB 12) may perform link-level simulations.
  • the TTI bundling selected for legacy VoIP UEs is four TTIs as per the LTE Release 8 specifications (also referred to herein as LTE Release 8 standard). Each TTI may be a one millisecond (ms) timeslot (e.g., resources) and as such four TTIs is 4 ms.
  • the TTI bundling for low cost MTC UEs e.g., UEs 10'
  • 1,000 TTIs e.g., 1 second, since each TTI is 1 ms
  • a number of TTIs (e.g., 1,000 TTIs) in a bundle that exceeds a number TTIs (e.g., 4 TTIs) of a smaller bundle may, but need not, relate to more reliable transmissions since more resources (e.g., timeslots) may be available to transmit traffic (e.g., data).
  • the frequency hopping selected for the legacy VoIP UEs may be selected as inter- subframe frequency hopping as shown in table 1.
  • inter- subframe frequency hopping may denote frequency hopping every subframe for legacy UEs (e.g., UEs 10 (e.g., legacy VoIP UEs)).
  • a legacy UE may utilize a different frequency channel to transmit/receive data each subframe.
  • the frequency hopping for the low-cost MTC UEs may be selected, for example, as every 1, 40 or 1,000 subframes.
  • the 100 byte package may be segmented into five 20 byte transport blocks (TBs), and each TB is transmitted in one second.
  • FIG. 5 shows the residual Block Error Rate (BLER) and throughput (TP) curves of normal LTE UEs (e.g., legacy VoIP UEs (e.g., UEs 10)) and low-cost MTC UEs (e.g., MTC UEs 10').
  • curve 3 corresponds to frequency hopping every TTI or every subframe according to the current LTE standard for legacy UEs.
  • Curve 5 corresponds to frequency hopping every TTI or subframe for MTC UEs (e.g., MTC UEs 10') and curve 7 corresponds to frequency hopping every 1,000 TTIs or 1,000 subframes for MTC UEs.
  • curve 9 corresponds to frequency hopping every 40 TTIs or 40 subframes for MTC UEs.
  • the BLER and the throughput curves may be generated by the processor (e.g., processor 24) of a network device (e.g., eNB 12). Presuming 2% residual BLER as the performance target, FIG. 5 shows that the operation Signal-to-Noise Ratio (SNR) for uplink VoIP is about -6.8 dB for curve 3.
  • SNR Signal-to-Noise Ratio
  • RB resource block
  • the gain e.g., 12.5 dB
  • the gain did not improve by 20 dB with respect to curve 3.
  • One reason for this big loss may be very poor channel estimation performance under such low SNR scenario.
  • One mechanism may be that multiple consecutive subframes using a channel is jointly estimated assuming the same demodulation reference signal sequence, since the channel is extremely slow time-variant for these low-cost MTC UEs (e.g., UE 10').
  • frequency hopping may need to be turned off.
  • curve 7 corresponds to frequency hopping every 1,000 TTIs which equivalently denotes that frequency hopping is turned off, as only one frequency carrier is used in the duration of the transmission for one transport block, for example, 1,000 TTIs.
  • cross-subframe channel estimation and frequency diversity may need to be kept at the same time.
  • One approach is for the processor (e.g., processor 24) of the network device (e.g., eNB 12) extending the current frequency hopping time-domain granularity from one time- slot or one subframe to N FH subframes, where N FH > 1 in which N denotes number and FH denotes frequency hopping.
  • cross-subframe channel estimation may be applied within these N FH subframes, where the same frequency resource may be utilized by one MTC UE (e.g., UE 10').
  • the operation SNR may reach -25.3 dB for curve 9, which is lower than the targeted -23.8 dB.
  • the curve 9 exhibits a 20 dB gain (as compared with 4 TTI bundling for curve 3).
  • the processor e.g., processor 24 of the network device (e.g., eNB 12) may determine that a 20 dB gain may be achieved.
  • TTI bundling and frequency hopping are existing techniques used for PUSCH transmission in the current LTE standard. But for the low-cost MTC UE scenario, the existing LTE solution of utilizing one subframe, or a half subframe, is unable (see e.g., curve 5 of FIG. 5) to satisfy channel estimation performance and frequency diversity gain at the same time, and is unable to achieve the required 20 dB gain with simple TTI bundling extension, regardless of whether frequency hopping is turned on or off. As described above, and shown in FIG. 5 with respect to curve 5, a frequency hopping of greater than one subframe is needed to achieve a 20 dB gain.
  • the time-domain granularity of PUSCH frequency hopping may be extended by a processor (e.g., processor 24) of a network device (e.g., eNB 12) to more than one subframe, in an instance in which a long TTI bundling is utilized under a very low SNR scenario.
  • a low cost MTC UE e.g., UE 10'
  • a time-domain granularity of PUSCH hopping may be indicated by the processor (e.g., processor 24) of the network device (e.g., eNB 12) via higher layer signaling, via an uplink grant in a Random Access Response (RAR) or in a certain field in a Downlink Control Information (DCI) format, in which at least one of the indicated values is longer than one subframe.
  • the processor e.g., processor 24
  • the network device e.g., eNB 12
  • DCI Downlink Control Information
  • a field of the RAR, a field of the DCI format or a field of an information element of higher layer signaling may indicate the PUSCH frequency hopping time-domain granularity.
  • the field of higher layer signaling, the field of the RAR or the field of the DCI format may indicate both TTI bundling size and PUSCH frequency hopping time-domain granularity, which may have an implicit linkage.
  • a field of a PUSCH frequency hopping time-domain granularity may be provided by a network device to a UE (e.g., UE 10') in a UE-specific Radio Resource Control, (RRC) Information Element (IE), such as for example, a
  • RRC Radio Resource Control
  • the RRC IE (e.g., PUSCH-ConfigDedicated, MAC-MainConfig IE) may be signaled by the network device (e.g., eNB 12) to a UE (e.g., UE 10') in a random access procedure.
  • This higher layer signaling could also be other UE specific RRC signaling, cell specific RRC signaling (e.g., a cell specific information element (e.g., PUSCH-ConfigCommon)), content that is part of a Random- Access Channel (RACH) response, RRC signaling that is common to a group of UEs, or any other suitable signaling.
  • the indication of the field indicating that PUSCH frequency hopping is extended to more than one subframe may be in a form of enumeration.
  • table 2 of FIG. 6 illustrates an example of the frequency hopping granularity only indication.
  • table 3 of FIG. 7 illustrates the TTI bundling size with frequency hopping granularity joint indication. Referring now to FIG. 6, an example embodiment of a PUSCH frequency hopping time-domain granularity indication in a table is provided. In the example embodiment of FIG.
  • a processor (e.g., processor 24) of a network device may include data in the table 2 indicating a frequency hopping time-domain granularity of 10 subframes associated with index 2 and a frequency hopping time-domain granularity of 40 subframes associated with index 3.
  • a MTC UE (e.g., UE 10') that receives the PUSCH hopping time-domain granularity indication of table 2, from a network device (e.g., eNB 12), may utilize (e.g., transmit data (e.g., radio signals) by rapidly switching a carrier among various frequency channels) the frequency hopping indication of more than one subframe (e.g., 10 subframes, 40 subframes) to achieve a 20 dB gain.
  • a network device e.g., eNB 12
  • the processor (e.g., processor 24) of the network device may include data indicating a frequency hopping time-domain granularity subframe of 0.5 and a frequency hopping time-domain granularity subframe of 1 to enable MTC UEs (e.g., UE 10') receiving the PUSCH frequency hopping time-domain granularity of table 2 to frequency hop per the existing LTE standard.
  • a processor e.g., processor 24 of the network device (e.g., eNB 12) may include data indicating TTI bundling sizes associated with frequency hopping time-domain granularity subframes in table 3.
  • the processor e.g., processor 24
  • the processor e.g., processor 24
  • the network device e.g., eNB 12
  • the processor may include data indicating a frequency hopping time-domain granularity subframe of 0.5 and a frequency hopping time-domain granularity subframe of 1 to enable MTC UEs (e.g., UE 10') receiving the PUSCH hopping time-domain granularity of table 3 to frequency hop per the existing LTE standard.
  • the subframe of 0.5 may be associated with, for example, with 1 TTI
  • a subframe of 1 may be associated with 1 TTI.
  • another subframe of 1 may be associated with 4 TTIs.
  • the processor e.g., processor 24
  • the processor may assign the processor (e.g., processor 24) of the network device (e.g., eNB 12) to support the frequency hopping time.
  • a low-cost MTC UE may perform the frequency hopping by utilizing (e.g., transmitting data (e.g., radio signals) by rapidly switching a carrier among many frequency channels) a subframe greater than 1 to achieve a 20 dB gain for the duration of the TTI bundling size. Additionally, the MTC UE may also perform frequency hopping by utilizing a subframe of 1 or 0.5 for the duration of a TTI bundling size (e.g., 1 TTI, 4 TTIs).
  • some example embodiments may provide benefits of both cross-subframe channel estimation and frequency hopping for PUSCH transmission for low-cost MTC UEs at extremely low SNR, based in part on utilizing changes to signaling (e.g., RRC signaling).
  • signaling e.g., RRC signaling
  • an apparatus e.g., a network device (e.g., eNB 12) may assign or extend a frequency hopping time-domain granularity for a Physical Uplink Shared Channel to a number of subframes (e.g., 40 subframes) greater than one subframe.
  • an apparatus may provide a generated indication (e.g., a RAR, a DCI format, an information element, etc.) identifying the extended frequency hopping time-domain granularity to at least one communication device (e.g., a MTC UE (e.g., UE 10')) to enable the communication device to perform frequency hopping for the number of subframes greater (e.g., 40 subframes) than one subframe.
  • a MTC UE e.g., UE 10'
  • the provision of the indication to the communication device may enable the communication device to perform frequency hopping for the number of subframes during a duration of a group or bundle of transmission time intervals in order to achieve a 20 dB gain improvement in coverage.
  • an apparatus e.g., a MTC UE (e.g., UE 10') may receive, from a network device (e.g., eNB 12), an indication (e.g., a RAR, a DCI format, an information element, etc.) of an extended frequency hopping time-domain granularity for a Physical Uplink Shared Channel denoting a number of subframes (e.g., 40 subframes) greater than one subframe.
  • a network device e.g., eNB 12
  • an indication e.g., a RAR, a DCI format, an information element, etc.
  • an apparatus may perform frequency hopping for the number of subframes greater than one subframe.
  • the apparatus e.g., a MTC UE (e.g., UE 10')
  • the apparatus e.g., a MTC UE (e.g., UE 10')
  • FIGS. 8 and 9 are flowcharts of a system, method and computer program product according to an example embodiment of the invention. It will be understood that each block of the flowcharts, and combinations of blocks in the flowcharts, can be implemented by various means, such as hardware, firmware, and/or a computer program product including one or more computer program instructions. For example, one or more of the procedures described above may be embodied by computer program instructions. In this regard, in an example embodiment, the computer program instructions which embody the procedures described above are stored by a memory device (e.g., memory 26, memory 36) and executed by a processor (e.g., processor 24, processor 34).
  • a memory device e.g., memory 26, memory 36
  • a processor e.g., processor 24, processor 34
  • any such computer program instructions may be loaded onto a computer or other programmable apparatus (e.g., hardware) to produce a machine, such that the instructions which execute on the computer or other programmable apparatus cause the functions specified in the flowcharts blocks to be implemented.
  • the computer program instructions are stored in a computer-readable memory that can direct a computer or other programmable apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instructions which implement the function(s) specified in the flowcharts blocks.
  • the computer program instructions may also be loaded onto a computer or other programmable apparatus to cause a series of operations 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 implement the functions specified in the flowcharts blocks.
  • blocks of the flowcharts support combinations of means for performing the specified functions. It will also be understood that one or more blocks of the flowcharts, and combinations of blocks in the flowcharts, can be implemented by special purpose hardware-based computer systems which perform the specified functions, or combinations of special purpose hardware and computer instructions.
  • an apparatus for performing the methods of FIGS. 8 and 9 above may comprise a processor (e.g., the processor 24, processor 34) configured to perform some or each of the operations (800 - 805, 900 - 905) described above.
  • the processor may, for example, be configured to perform the operations (800 - 805, 900 - 905) by performing hardware implemented logical functions, executing stored instructions, or executing algorithms for performing each of the operations.
  • the apparatus may comprise means for performing each of the operations described above.
  • examples of means for performing operations may comprise, for example, the processor 24 (e.g., as means for performing any of the operations described above), and/or a device or circuitry for executing instructions or executing an algorithm for processing information as described above.

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

Abstract

L'invention concerne un procédé, un appareil et un produit logiciel conçus pour améliorer le saut de fréquence avec regroupement d'intervalles de temps de transmission. À cet effet, l'invention vise un procédé qui consiste à étendre une granularité en domaine temporel pour saut de fréquence pour un PUSCH (canal partagé en liaison montante physique) à un nombre de sous-trames supérieur à une sous-trame. Le procédé peut inclure en outre l'activation d'une fourniture d'indication générée qui identifie la granularité étendue en domaine temporel pour saut de fréquence à au moins un dispositif de communication afin de permettre au dispositif de communication de réaliser un saut de fréquence pour le nombre de sous-trames supérieur à une sous-trame. L'invention concerne également des appareils et des produits logiciels correspondants.
PCT/CN2013/070602 2013-01-17 2013-01-17 Procédé et appareil servant à faciliter une granularité étendue en domaine temporel pour saut de fréquence en liaison montante WO2014110757A1 (fr)

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CN107534460A (zh) * 2015-03-06 2018-01-02 Lg电子株式会社 在无线通信系统中配置用于mtc ue的帧结构和频率跳变的方法和装置
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US10749656B2 (en) 2015-03-06 2020-08-18 Lg Electronics Inc. Method and apparatus for handling starting subframe of control channel for MTC UE in wireless communication system
CN107534460B (zh) * 2015-03-06 2020-06-09 Lg电子株式会社 在无线通信系统中配置用于mtc ue的帧结构和频率跳变的方法和装置
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US10404320B2 (en) 2015-03-31 2019-09-03 Lg Electronics Inc. Method and apparatus for configuring frequency hopping pattern for MTC UE in wireless communication system
US10615842B2 (en) 2015-03-31 2020-04-07 Lg Electronics Inc. Method and apparatus for configuring frequency hopping pattern for MTC UE in wireless communication system
US10608696B2 (en) 2015-03-31 2020-03-31 Lg Electronics Inc. Method and apparatus for performing frequency hopping for MTC UE in wireless communication system
WO2016159697A1 (fr) * 2015-03-31 2016-10-06 Lg Electronics Inc. Procédé et appareil de configuration d'un schéma de saut de fréquence pour des ue m2m dans un système de communication sans fil
WO2017041729A1 (fr) * 2015-09-10 2017-03-16 中兴通讯股份有限公司 Procédé et dispositif de transmission d'informations
US10568133B2 (en) 2015-12-08 2020-02-18 Huawei Technologies Co., Ltd. Data sending method, base station, and terminal device
CN111818663B (zh) * 2015-12-08 2022-07-22 华为技术有限公司 一种数据发送方法、基站以及终端设备
CN108633107B (zh) * 2015-12-08 2019-07-12 华为技术有限公司 一种数据发送方法、基站以及终端设备
CN108633107B9 (zh) * 2015-12-08 2019-08-20 华为技术有限公司 一种数据发送方法、基站以及终端设备
CN111818663A (zh) * 2015-12-08 2020-10-23 华为技术有限公司 一种数据发送方法、基站以及终端设备
CN108633107A (zh) * 2015-12-08 2018-10-09 华为技术有限公司 一种数据发送方法、基站以及终端设备
CN107295692A (zh) * 2016-03-30 2017-10-24 中兴通讯股份有限公司 随机接入的方法及装置
CN107295692B (zh) * 2016-03-30 2022-08-02 中兴通讯股份有限公司 随机接入的方法及装置
CN109156004B (zh) * 2016-05-12 2023-05-09 株式会社Ntt都科摩 用户终端以及无线通信方法
CN109156004A (zh) * 2016-05-12 2019-01-04 株式会社Ntt都科摩 用户终端以及无线通信方法
WO2019052334A1 (fr) * 2017-09-15 2019-03-21 华为技术有限公司 Procédé et dispositif de communication
US11206054B2 (en) 2017-09-15 2021-12-21 Huawei Technologies Co., Ltd. Communication method and device
US11258476B2 (en) 2017-11-17 2022-02-22 Huawei Technologies Co., Ltd. Frequency hopping processing method and device
WO2019096030A1 (fr) * 2017-11-17 2019-05-23 华为技术有限公司 Procédé et dispositif de traitement de sauts de fréquence
EP3944573A1 (fr) * 2020-07-23 2022-01-26 KT Corporation Appareil et procédé de transmission et de réception de canal de liaison montante
US11792048B2 (en) 2020-07-23 2023-10-17 Kt Corporation Apparatus and method for transmitting and receiving uplink channel

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