WO2014110804A1 - Canal de diffusion amélioré permettant une communication de type machine à faible coût avec amélioration d'une couverture - Google Patents

Canal de diffusion amélioré permettant une communication de type machine à faible coût avec amélioration d'une couverture Download PDF

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Publication number
WO2014110804A1
WO2014110804A1 PCT/CN2013/070707 CN2013070707W WO2014110804A1 WO 2014110804 A1 WO2014110804 A1 WO 2014110804A1 CN 2013070707 W CN2013070707 W CN 2013070707W WO 2014110804 A1 WO2014110804 A1 WO 2014110804A1
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WO
WIPO (PCT)
Prior art keywords
emib
format
system information
formats
ues
Prior art date
Application number
PCT/CN2013/070707
Other languages
English (en)
Inventor
Erlin Zeng
Wei Bai
Chunyan Gao
Na WEI
Shuang TAN
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/CN2013/070707 priority Critical patent/WO2014110804A1/fr
Publication of WO2014110804A1 publication Critical patent/WO2014110804A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/32—TPC of broadcast or control channels
    • H04W52/325—Power control of control or pilot channels

Definitions

  • the various embodiments relate to the field of wireless mobile network communications, and particularly to channel control and quality protocols in such networks.
  • the 20 dB coverage improvement should target low cost machine type communication (MTC) UEs using very low rate traffic with relaxed latency (e.g. size of the order of 100 bytes/message in uplink (UL) and 20 bytes/message in downlink (DL), and allowing latency of up to 10 seconds for DL and up to 1 hour in UL, which excludes voice communication).
  • MTC machine type communication
  • the coverage enhancement is intended to improve communication with machines such as industrial meters (e.g., electric, water, gas) often located deep within buildings.
  • the primary broadcast channel needs to support coverage enhancement since low cost MTC users need to acquire the necessary system information.
  • UE user equipment
  • the critical master information block MIB
  • TTI transmission time interval
  • the PBCH is mapped to four symbols in each frame on the 72 center subcarriers. Decoding delay can be traded for coverage by accumulating several TTIs coherently.
  • the PBCH can also be power boosted for better coverage. Another possibility is to increase the resources allocated to PBCH.
  • a first embodiment is a method comprising causing one of at least first and second predefined enhanced master information block (eMIB) formats to be sent; and selecting a transmission scheme suited to the one of the eMIB formats being sent.
  • the method may further comprise switching between the at least first and second eMIB formats according to whether receiving devices require coverage enhancement, and causing system information not signaled in the at least first and second eMIB formats to be sent via common search space of the physical control channel (PDCCH) with the system information-radio network temporary identifier (SI-RNTI).
  • PDCCH physical control channel
  • SI-RNTI system information-radio network temporary identifier
  • the selected transmission scheme for the first eMIB format is the standard MIB information sent according to the physical broadcast channel (PBCH) scheme
  • the selected transmission scheme for the second eMIB format is targeted to MTC UEs and employs primary synchronization signal/secondary synchronization signal (PSS/SSS) repetition and/or power boosting.
  • the choice between said first and second eMIB formats may be determined by the existence of MTC users with a coverage enhancement requirement, and the choice between said first and second eMIB formats may be based on a predefined time period such as a predefined quiet time period.
  • a related method comprises causing a primary synchronization signal/secondary synchronization signal (PSS/SSS) transmission scheme to be received and detected; and causing an enhanced master information block (eMIB) format to be decoded.
  • This method further comprises determining if the PSS/SSS transmission scheme uses extra repetitions, and in the instance that PSS/SSS is received without extra repetitions, determining that a first eMIB format is received, and in the instance that PSS/SSS is received with extra repetitions, determining that a second eMIB format is received.
  • the first eMIB format is targeted to and contains all critical system information for all normal UEs
  • the second eMIB format is targeted to and contains all critical system information for low cost machine type communication (MTC) UEs.
  • MTC machine type communication
  • Another embodiment is an apparatus comprising at least a processor, a memory in communicating relation with the processor and having stored computer coded instructions within it, said instructions when executed by the processor causing the apparatus to perform: causing one of at least first and second predefined enhanced master information block (eMIB) formats to be sent, and selecting a transmission scheme suited to the one of the eMIB formats being sent.
  • the apparatus may further comprise instructions causing the apparatus to perform switching between the at least first and second eMIB formats according to whether receiving devices require coverage enhancement, and causing system information not signaled in the at least first and second eMIB formats to be sent via common search space of the physical control channel (PDCCH) with the system information-radio network temporary identifier (SI-RNTI).
  • PDCCH physical control channel
  • SI-RNTI system information-radio network temporary identifier
  • the first eMIB format contains all critical system information for all normal UEs
  • the second eMIB format contains all critical system information for normal UEs plus system information specific to machine type communication (MTC) UEs.
  • the selected transmission scheme for the first eMIB format may be the standard MIB information sent according to the physical broadcast channel (PBCH) scheme
  • the selected transmission scheme for the second eMIB format may be targeted to MTC UEs and employs primary synchronization signal/secondary synchronization signal (PSS/SSS) repetition and/or power boosting.
  • PBCH physical broadcast channel
  • PSS/SSS primary synchronization signal/secondary synchronization signal
  • the selection between said first and second eMIB formats may be determined by the existence of MTC users with a coverage enhancement requirement, while the selection between said first and second eMIB formats may be based on a predefined time period such as a predefined quiet time period.
  • This apparatus may be an enhanced node B, a network access point, or a base station.
  • a memory in communicating relation with the processor and having stored computer coded instructions within it, said instructions when executed by the processor causing the apparatus to perform: causing a primary synchronization signal/secondary synchronization signal (PSS/SSS) transmission scheme to be received and detected, and causing an enhanced master information block (eMIB) format to be decoded. Further instructions may cause the apparatus to perform determining if the PSS/SSS transmission scheme uses extra repetitions, and in the instance that PSS/SSS is received without extra repetitions, determining that a first eMIB format is received, or in the instance that PSS/SSS is received with extra repetitions, determining that a second eMIB format is received.
  • PSS/SSS primary synchronization signal/secondary synchronization signal
  • eMIB enhanced master information block
  • the first eMIB format is targeted to and contains all critical system information for all normal UEs
  • the second eMIB format is targeted to and contains all critical system information for machine type communication (MTC) UEs.
  • MTC machine type communication
  • This apparatus may be a mobile phone, or a machine type communication device.
  • Another embodiment may be a computer program product comprising a non- transitory computer readable medium having stored computer coded instructions, said instructions when executed by a processor causing an apparatus to perform causing one of at least first and second predefined enhanced master information block (eMIB) formats to be sent; and selecting a transmission scheme suited to the one of the eMIB formats being sent.
  • the instructions may further comprise switching between the at least first and second eMIB formats according to whether receiving devices require coverage enhancement, and causing system information not signaled in the at least first and second eMIB formats to be sent via common search space of the physical control channel (PDCCH) with the system information-radio network temporary identifier (SI-RNTI).
  • PDCCH physical control channel
  • SI-RNTI system information-radio network temporary identifier
  • the first eMIB format contains all critical system information for all normal UEs
  • the second eMIB format may contain all critical system information for normal UEs plus system information specific to machine type communication (MTC) UEs.
  • the selected transmission scheme for the first eMIB format may be the standard MIB information sent according to the physical broadcast channel (PBCH) scheme
  • the selected transmission scheme for the second eMIB format may be targeted to MTC UEs and employs primary synchronization signal/secondary synchronization signal (PSS/SSS) repetition and/or power boosting.
  • PSS/SSS primary synchronization signal/secondary synchronization signal
  • the selection between said first and second eMIB formats may be determined by the existence of MTC users with a coverage enhancement requirement, or the selection between said first and second eMIB formats may be based on a predefined time period such as a predefined quiet time period.
  • Another computer program product comprises a non-transitory computer readable medium having stored computer coded instructions, said instructions when executed by a processor causing an apparatus to perform: causing a primary synchronization signal/secondary synchronization signal (PSS/SSS) transmission scheme to be received and detected, and causing an enhanced master information block (eMIB) format to be decoded.
  • This computer program product may further comprise instructions that cause an apparatus to perform: determining if the PSS/SSS transmission scheme uses extra repetitions, and in the instance that PSS/SSS is received without extra repetitions, determining that a first eMIB format is received, or in the instance that PSS/SSS is received with extra repetitions, determining that a second eMIB format is received.
  • the first eMIB format may be targeted to and contains all critical system information for all normal UEs
  • the second eMIB format may be targeted to and contains all critical system information for low cost machine type communication (MTC) UEs.
  • MTC machine type communication
  • an apparatus comprising means for causing one of at least first and second predefined enhanced master information block (eMIB) formats to be sent; and means for selecting a transmission scheme suited to the one of the eMIB formats being sent.
  • the apparatus may further comprise means for switching between the at least first and second eMIB formats according to whether receiving devices require coverage enhancement, and means for causing system information not signaled in the at least first and second eMIB formats to be sent via common search space of the physical control channel (PDCCH) with the system information-radio network temporary identifier (SI-RNTI).
  • PDCCH physical control channel
  • SI-RNTI system information-radio network temporary identifier
  • the first eMIB format contains all critical system information for all normal UEs
  • the second eMIB format contains all critical system information for normal UEs plus system information specific to machine type communication (MTC) UEs.
  • the selected transmission scheme for the first eMIB format may be the standard MIB information sent according to the physical broadcast channel (PBCH) scheme
  • the selected transmission scheme for the second eMIB format may be targeted to MTC UEs and employs primary synchronization signal/secondary synchronization signal (PSS/SSS) repetition and/or power boosting.
  • PBCH physical broadcast channel
  • PSS/SSS primary synchronization signal/secondary synchronization signal
  • the selection between said first and second eMIB formats may be determined by the existence of MTC users with a coverage enhancement requirement, and the selection between said first and second eMIB formats may be based on a predefined time period such as a predefined quiet time period.
  • a related apparatus may comprise means for causing a primary synchronization signal/secondary synchronization signal (PSS/SSS) transmission scheme to be received and detected, and means for causing an enhanced master information block (eMIB) format to be decoded.
  • the apparatus may also comprise means for determining if the PSS/SSS transmission scheme uses extra repetitions, and in the instance that PSS/SSS is received without extra repetitions, means for determining that a first eMIB format is received, or in the instance that PSS/SSS is received with extra repetitions, means for determining that a second eMIB format is received.
  • the first eMIB format may be targeted to and contains all critical system information for all normal UEs
  • the second eMIB format may be targeted to and contains all critical system information for machine type communication (MTC) UEs.
  • MTC machine type communication
  • Fig. 1 is a schematic drawing of a generalized wireless communications network.
  • Fig. 2 is a schematic block drawing of an apparatus that may be embodied by a mobile terminal or an access point and may be specifically configured in accordance with an example embodiment of the present invention.
  • Fig. 3 is a flow diagram of a first embodiment of a method as described herein.
  • Fig. 4 is a flow diagram of a second embodiment of a method as described herein.
  • 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 applies to all uses of this term in this application, including in any claims.
  • 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.
  • Fig. 1 which includes a mobile terminal 8 that is capable of communication with a network 6 (e.g., a core network) via, for example, an access point 2 (AP).
  • a network 6 e.g., a core network
  • AP access point 2
  • the network may be configured in accordance with Global System for Mobile communications (GSM) / Enhanced Data rates for Global Evolution (EDGE) Radio Access Network (GERAN), the network may employ other mobile access mechanisms such as a Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (UTRAN), Long Term Evolution (LTE), LTE-Advanced (LTE-A), wideband code division multiple access (W-CDMA), CDMA2000, and/or the like.
  • UMTS Universal Mobile Telecommunications System
  • UTRAN Universal Mobile Telecommunications System
  • LTE Long Term Evolution
  • LTE-A LTE-Advanced
  • W-CDMA wideband code division multiple access
  • CDMA2000 Code Division Multiple Access 2000
  • the embodiments of the present invention may also be implemented in future LTE based technologies, such as LTE-A and subsequently developed mobile networks.
  • the network 6 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 base stations, such as one or more Base Transceiver Stations (BTSs) and Base Station Controllers (BSCs), node Bs, evolved node Bs (eNBs), access points (AP), relay nodes or the like (all of which being hereinafter generically referenced as an access point (AP)), each of which may serve a coverage area divided into one or more cells.
  • BTSs Base Transceiver Stations
  • BSCs Base Station Controllers
  • node Bs node Bs
  • eNBs evolved node Bs
  • AP access points
  • relay nodes or the like all of which being hereinafter generically referenced as an access point (AP)
  • the network may include one or more cells, including, for example, the AP 2, each of which may serve a respective coverage area.
  • the serving cell 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
  • PLMNs public land mobile networks
  • the mobile terminals 8 may be in communication with each other or other devices via the network 6.
  • each of the mobile terminals may include an antenna or antennas for transmitting signals to and for receiving signals from a base station.
  • the mobile terminal 8, also known as a client device may be a mobile communication device such as, for example, a mobile telephone, portable digital assistant (PDA), pager, laptop computer, tablet computer, or any of numerous other hand held or portable communication devices, computation devices, content generation devices, content consumption devices, universal serial bus (USB) dongles, data cards or combinations thereof.
  • the mobile terminal 8 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 to operate in a particular way or execute specific functionality when the instructions are executed by the one or more processors.
  • the mobile terminal 8 may also include communication circuitry and corresponding hardware/software to enable communication with other devices and/or the network 6.
  • an apparatus 20 that may be embodied by or otherwise associated with a mobile terminal 8 (user equipment (UE), such as a cellular phone, a personal digital assistant (PDA), smartphone, tablet computer or the like) or an AP 2 may include or otherwise be in communication with a processor 22, a memory device 24, a communication interface 28, and a user interface 30.
  • UE user equipment
  • PDA personal digital assistant
  • AP 2 may include or otherwise be in communication with a processor 22, a memory device 24, a communication interface 28, and a user interface 30.
  • the processor 22 (and/or co-processors or any other processing circuitry assisting or otherwise associated with the processor) may be in communication with the memory device 24 via a bus for passing information among components of the apparatus 20.
  • the memory device 24 may include, for example, one or more non-transitory volatile and/or non- volatile memories.
  • the memory device 24 may be an electronic storage device (e.g., a computer readable storage medium) comprising gates configured to store data (e.g., bits) that may be retrievable by a machine (e.g., a computing device like the processor).
  • the memory device 24 may be configured to store information, data, content, applications, instructions, or the like for enabling the apparatus to carry out various functions in accordance with an example embodiment of the present invention.
  • the memory device could be configured to buffer input data for processing by the processor.
  • the memory device 24 could be configured to store instructions for execution by the processor 22.
  • the apparatus 20 may, in some embodiments, be embodied by a mobile terminal 8 or an AP 2.
  • the apparatus may be embodied as a chip or chip set.
  • the apparatus 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 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 processor 22 may be embodied in a number of different ways.
  • the processor may be embodied as one or more of various hardware processing means such as a coprocessor, a microprocessor, a controller, a digital signal processor (DSP), a processing element with or without an accompanying DSP, or various other processing circuitry including integrated circuits such as, for example, an ASIC (application specific integrated circuit), an FPGA (field programmable gate array), a microcontroller unit (MCU), a hardware accelerator, a special-purpose computer chip, or the like.
  • the processor may include one or more processing cores configured to perform independently.
  • a multi-core processor may enable multiprocessing within a single physical package.
  • the processor may include one or more processors configured in tandem via the bus to enable independent execution of instructions, pipelining and/or multithreading.
  • the processor may be embodied by the processor of the mobile terminal.
  • the processor 22 may be configured to execute instructions stored in the memory device 24 or otherwise accessible to the processor.
  • the processor may be configured to execute hard coded functionality.
  • the processor may represent an entity (e.g., physically embodied in circuitry) capable of performing operations according to an embodiment 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 algorithms and/or operations described herein when the instructions are executed.
  • the processor may be a processor of a specific device (e.g., a mobile terminal 8) configured to employ an embodiment of the present invention by further configuration of the processor by instructions for performing the algorithms and/or operations described herein.
  • the processor may include, among other things, a clock, an arithmetic logic unit (ALU) and logic gates configured to support operation of the processor.
  • ALU arithmetic logic unit
  • the communication interface 28 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 apparatus 20.
  • the communication interface may include, for example, an antenna (or multiple antennas) and supporting hardware and/or software for enabling communications with a wireless communication network. Additionally or alternatively, the communication interface may include the circuitry for interacting with the antenna(s) to cause transmission of signals via the antenna(s) or to handle receipt of signals received via the antenna(s).
  • the communications interface of one embodiment may include a plurality of cellular radios, such as a plurality of radio front ends and a plurality of base band chains.
  • the communication interface may alternatively or also support wired communication.
  • the communication interface may include a communication modem and/or other hardware/software for supporting communication via cable, digital subscriber line (DSL), universal serial bus (USB) or other mechanisms.
  • the apparatus may include a user interface 30 that may, in turn, be in communication with the processor 22 to receive an indication of a user input and/or to cause provision of an audible, visual, mechanical or other output to the user.
  • the user interface may include, for example, a keyboard, a mouse, a joystick, a display, a touch screen(s), touch areas, soft keys, a microphone, a speaker, or other input/output mechanisms.
  • the processor may comprise user interface circuitry configured to control at least some functions of one or more user interface elements such as, for example, a speaker, ringer, microphone, display, and/or the like.
  • the processor and/or user interface circuitry comprising the processor may be configured to control one or more functions of one or more user interface elements through computer program instructions (e.g., software and/or firmware) stored on a memory accessible to the processor (e.g., memory device and/or the like).
  • computer program instructions e.g., software and/or firmware
  • a memory accessible to the processor e.g., memory device and/or the like.
  • two enhanced master information block (eMIB) patterns are defined and switching between the two patterns is supported.
  • Two eMIB formats are predefined and the eNB chooses between format 1 and format 2 based on the existence of MTC users, such as low cost MTC users with coverage enhancement requirement.
  • o eMIB format 1 contains all the critical system information
  • o eMIB format 2 contains all the critical system information, plus the system information specific for MTC users, such as low cost MTC users.
  • MTC UEs such as low cost MTC UEs with coverage enhancement, have enough system information needed to initialize a random access channel (RACH) procedure.
  • RACH random access channel
  • UE determines the eMIB format based on the detected primary synchronization signal/secondary synchronization signal (PSS/SSS) transmission scheme, and decodes eMIB accordingly.
  • PSS/SSS primary synchronization signal/secondary synchronization signal
  • eMIB format 1 Necessary system information that is not signaled via eMIB format 1 shall be scheduled via common search space of the physical control channel (PDCCH) with the system information-radio network temporary identifier (SI-RNTI).
  • eMIB format 1 and its transmission scheme eMIB format 1 and its transmission scheme
  • eMIB format 1 contains all the critical system information for all the UEs which do not need coverage enhancement (that is, normal UEs).
  • the signaling content in eMIB format 1 is the current MIB information plus information about common search space for E-PDCCH;
  • the signaling content in eMIB format 1 is the eMIB format 2 information except that the information specific to MTC users, such as low cost MTC users with coverage enhancement, is dropped.
  • Transmission scheme eMIB format 1 targets normal UEs, and the transmission scheme is similar to the current PBCH, but increases the resources accordingly if more signaling content is introduced, as in 2) in Table 1. There is no attempt to address the extra coverage enhancement requirement.
  • eMIB format 2 contains all the critical system information plus the system information specific for MTC users, such as low cost MTC users. After receiving the eMIB format 2, MTC users, such as low cost MTC UEs with coverage enhancement, have enough system information needed to initialize a RACH procedure.
  • MTC users such as low cost MTC UEs with coverage enhancement, have enough system information needed to initialize a RACH procedure.
  • Table 2 Example of eMIB format 2 content
  • the field [lmtc-radioResourceConfigCommon] is to capture the system information specifically for MTC users, such as low cost MTC users.
  • MTC users such as low cost MTC users.
  • Table 3 where necessary configuration information regarding some downlink (DL) and uplink (UL) physical channels are provided. In practice these parameters may be different from the configurations for normal UEs, most often due to different supported bandwidth or other UE capabilities.
  • eMIB format 2 targets itself to MTC users, such as low cost MTC users with coverage enhancement, and to achieve such enhancement, certain repetition or power boosting can be used on the eMIB format 2 transmission.
  • PSS/SSS signals on the physical channel may also be sent with repetition or power boosting to signal that eMIB format 2 is being sent.
  • the eMIB format 2 signal and the PSS/SSS signal do not necessarily employ the same enhancement method; that is, the eMIB format 2 signals may be sent with power boosting while PSS/SSS may be sent with repetition for enhanced coverage.
  • eNB chooses between format 1 and format 2 based on the existence of MTC users, such as low cost MTC users with coverage enhancement requirement. Or eNB chooses between format 1 and format 2 based on a predefined time period; for example, format 2 is used when the eNB enters certain quiet time period, but otherwise utilizes format 1. If eMIB format 2 is used, eNB applies the corresponding transmission scheme to it to ensure coverage.
  • UE determines eMIB format from eNB based on the control signal transmission scheme, and decodes eMIB accordingly.
  • Normal UEs
  • eMIB format 2 For example, if normal UE detects that PSS/SSS channels use extra repetitions for coverage enhancement, it shall assume eMIB format 2 is in use.
  • the eMIB format 2 transmission scheme can be defined so that it has a number of repetitions, each of which may be self-decodable. In this case, even if eMIB format 2 is used, normal UEs may not have to receive entire transmissions to decode the system information. This saves the system information overhead compared with transmitting separately to different types of UEs.
  • SI system information
  • a MTC UE may not be able to decode eMIB format 1 because its transmission scheme is not optimized for the coverage enhancement scenario. In this case, if such UE detects PSS/SSS with coverage enhancement, it shall assume eMIB format 2 is used and the SI acquisition procedure is according to the signaled MIB content while any other necessary SI is scheduled via the common search space of the physical control channel with SI-RNTI.
  • a certain small modification can be introduced to the control signal channels, such as the PSS/SSS channels, to indicate eMIB format 2 is in use, for example, by switching the positions of PSS/SSS signals as compared to existing pattern, or by changing the relative positions of PSS/SSS signals.
  • UE may still be able to determine the eMIB format based on PSS/SSS channels detected.
  • the procedure should be modified so that both types of UEs will be able to blindly detect the exact format of eMIB, for example, based on different payload size of the signaling content. Signaling of other SI not contained in eMIB
  • Necessary system information that is not signaled via Step 1 shall be scheduled via common search space of the physical control channel with SI-RNTI. This means the system information is conveyed by PDSCH according to the DL grant received.
  • One possibility is that normal UEs need only Basic Procedure 3), but MTC users with coverage enhancement acquire SI based on Basic Procedure 1) and 2) only.
  • the apparatus may include means, such as the processor 22, the communications interface 28 or the like, for causing one of at least two eMIB formats to be sent 301.
  • the apparatus may include means, such as the processor or the like, for making a determination of which format to send 303 based on whether the format is intended for normal UE or MTC, e.g., low cost MTC. If the target is normal UE, the apparatus may include means, such as the processor or the like, for selecting the first format 304 containing all critical system information for normal UE networking.
  • the apparatus may include means, such as the processor or the like, for selecting the second eMIB format 305 that targets MTCs, e.g., low cost MTCs, and contains all critical SI for normal UE plus SI for a MTC UE.
  • the apparatus may include means, such as the processor or the like, for selecting a transmission scheme suited to the chosen eMIB format 307. That selection is made based 309 on which eMIB format was chosen.
  • the apparatus may include means, such as the processor or the like, for selecting a first transmission scheme 311 which is a standard master information block in the physical broadcast channel scheme.
  • the apparatus may include means, such as the processor or the like, for selecting a second transmission scheme 313 to reach MTCs, e.g., low cost MTCs, using at least one of repetition/power boosting for the second eMIB format signals and PSS/SSS repetition and/or power boosting to ensure that such MTCs have the opportunity to receive and decode eMIB.
  • the apparatus may also include means, such as the processor or the like, for switching between eMIB formats based upon criteria including 315 the enhanced coverage requirements of MTCs versus normal coverage for normal UE.
  • the apparatus may include means, such as the processor or the like, for switching between eMIB formats based on criteria that is based 317 on predefined time periods, such a entering quiet time, when MTCs may be reached effectively.
  • the apparatus may include means, such as the processor, the communications interface or the like, for causing any necessary system information that is not signaled in eMIB formats to be sent 319 in the common search space of PDCCH with SI-RNTI.
  • FIG. 4 Another embodiment of the method is illustrated in Fig. 4 that may be implemented by an apparatus 20 of Fig. 2 that is embodied by a mobile terminal, e.g., UE, and specifically configured in accordance with Fig. 4.
  • the apparatus of this embodiment may include means, such as the processor 22 or the like, for causing the PSS/SSS transmission scheme to be detected 401.
  • the apparatus of this embodiment may include means, such as the processor or the like, for decoding the received eMIB format 403.
  • the apparatus of this embodiment may also include means, such as the processor or the like, for determining 405 whether PSS/SSS was sent with extra repetitions.
  • the apparatus may include means, such as the processor or the like, for determining that the first eMIB format is received 407. If a repetitive PSS/SSS scheme was used, then the apparatus may include means, such as the processor or the like, for determining that the second eMIB format is received 409.
  • the first eMIB format contains and provides all critical system information necessary for normal UE 411.
  • the second format targets MTCs, such as low cost MTCs, and contains not only all critical SI for normal UE but also the necessary SI for MTC UEs to network properly 413.
  • Figures 3-4 are flowcharts of a method, apparatus and program product according to example embodiments of the invention. It will be understood that each block of the flowcharts, and combinations of blocks in the flowcharts, may be implemented by various means, such as hardware, firmware, processor, circuitry and/or other device associated with execution of software 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, the computer program instructions which embody the procedures described above may be stored by a memory device 24 of an apparatus 20 employing an embodiment of the present invention and executed by a processor 22 in the apparatus.
  • 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 resulting computer or other programmable apparatus embody a mechanism for implementing the functions specified in the flowchart blocks.
  • These computer program instructions may also be stored in a non-transitory computer-readable storage memory (as opposed to a transmission medium such as a carrier wave or electromagnetic signal) that may 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 the execution of which implements the function specified in the flowchart 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 provide operations for implementing the functions specified in the flowchart block(s).
  • the operations of Figures 3-4 when executed, convert a computer or processing circuitry into a particular machine configured to perform an example embodiment of the present invention.
  • the operations of Figures 3-4 define an algorithm for configuring a computer or processing circuitry (e.g., processor) to perform an example embodiment.
  • a general purpose computer may be configured to perform the functions shown in Figures 3-4 (e.g., via configuration of the processor), thereby transforming the general purpose computer into a particular machine configured to perform an example embodiment.
  • blocks of the flowcharts support combinations of means for performing the specified functions, combinations of operations for performing the specified functions and program instructions 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 operations, or combinations of special purpose hardware and computer instructions.
  • SI-RNTI System Information - Radio Network Temporary Identifier

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

Abstract

La présente invention concerne un procédé, un appareil, et un produit de programme informatique permettant de renforcer une amélioration de couverture pour des signaux de nœuds d'un réseau ciblés pour des dispositifs de communication de type machine (MTC) tels que des compteurs sans fil automatisés permettant la mesure d'utilisation de l'eau, de l'électricité et du gaz. Deux formats d'un bloc d'informations maître (MIB) améliorés sont définis. Un premier format contient toutes les informations systèmes critiques pour un équipement utilisateur (UE) commun tandis que le second format contient les informations systèmes critiques plus les informations systèmes spécifiques aux utilisateurs MTC. Le second format fournit des informations systèmes suffisantes nécessaires pour qu'un équipement utilisateur MTC lance une procédure de canal d'accès aléatoire. Un UE détermine le format eMIB sur la base du procédé de signal de synchronisation primaire/signal de synchronisation secondaire (PSS/SSS) détecté et décode l'eMIB en conséquence.
PCT/CN2013/070707 2013-01-18 2013-01-18 Canal de diffusion amélioré permettant une communication de type machine à faible coût avec amélioration d'une couverture WO2014110804A1 (fr)

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JP2018529276A (ja) * 2015-08-26 2018-10-04 クゥアルコム・インコーポレイテッドＱｕａｌｃｏｍｍ Ｉｎｃｏｒｐｏｒａｔｅｄ 単一受信のロングタームエボリューションのモビリティ強化
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WO2018170701A1 (fr) * 2017-03-20 2018-09-27 Oppo广东移动通信有限公司 Procédé de transmission d'informations système, station de base, et terminal
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