WO2013046154A1 - Systèmes de communications - Google Patents

Systèmes de communications Download PDF

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Publication number
WO2013046154A1
WO2013046154A1 PCT/IB2012/055167 IB2012055167W WO2013046154A1 WO 2013046154 A1 WO2013046154 A1 WO 2013046154A1 IB 2012055167 W IB2012055167 W IB 2012055167W WO 2013046154 A1 WO2013046154 A1 WO 2013046154A1
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WO
WIPO (PCT)
Prior art keywords
mobile terminal
rsu
access point
cause
paging message
Prior art date
Application number
PCT/IB2012/055167
Other languages
English (en)
Inventor
Gilles Charbit
Original Assignee
Renesas Mobile 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
Priority claimed from US13/246,462 external-priority patent/US8892028B2/en
Priority claimed from GB201116640A external-priority patent/GB2496836B8/en
Application filed by Renesas Mobile Corporation filed Critical Renesas Mobile Corporation
Publication of WO2013046154A1 publication Critical patent/WO2013046154A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/32—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data
    • H04W36/322—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data by location data

Definitions

  • the present invention relates generally to intelligent transportation systems and, more particularly, but not exclusively, to cellular-based or cellular-assisted intelligent transportation systems.
  • Intelligent transportation systems are configured to automate interactions between vehicles in order to achieve greater levels of safety, security and efficiency.
  • an ITS may enable a mobile terminal on an emergency vehicle to notify surrounding vehicles and/or upcoming traffic of its approach.
  • the notification may cause an alert and may even attempt to slow the nearby vehicles to allow for the safe passage of the emergency vehicle.
  • Other embodiments of an ITS may include setting variable speed limits, reporting traffic flow and/or the like.
  • a WAVE system consists of fixed road side units (RSUs) usually positioned along roads and mobile terminals (e.g., on board units or OBUs) mounted in vehicles.
  • the RSUs and mobile terminals may form WAVE basic service sets (WBSSs) connected to the Wide Area Network (WAN) via an appropriate portal.
  • WBSSs WAVE basic service sets
  • WAN Wide Area Network
  • Such a portal may be implemented via cable linking the RSU and the WAN, but this may, for example, add significantly to cost of implementing an ITS system.
  • Another version of a WAVE system may be implemented wirelessly over an ITS band.
  • ITS-Dedicated Short Range Communications DSRC
  • the ITS-DSRC is customarily deployed over 75 MHz of bandwidth in a relatively high-frequency band around 5.9 GHz in 10-20 MHz channel bandwidth, and therefore may not be suited for potentially long transmission range due to path loss.
  • increasing transmission power of the RSU-WAN link to account for the transmission range may lead to significant interference issues for the RSU-mobile terminal link.
  • Other current wireless solutions, such as those solutions used in current cellular networks are generally not suitable for an ITS environment due to the potential speed and high mobility of a mobile terminal as well as the generally small size of some RSU cells.
  • a method, apparatus and computer program product are therefore provided according to an example embodiment to provide a cellular based ITS environment.
  • the cellular based ITS environment may be configured based on long term evolution (LTE) interfaces.
  • LTE long term evolution
  • Such interfaces provide for a connection to a mobile terminal not only via an RSU, but also provide for a direct link between an access point and a mobile terminal.
  • the method, apparatus and computer program product provide an additional state for mobile terminal, which is referred to as a ready state herein.
  • the method, apparatus, and computer program product may also enable a defined ITS target area and provide for an ITS paging mechanism.
  • the present invention provides a method comprising: receiving configuration information from a first access point, wherein the configuration information defines an ITS target area comprising at least the first access point and a first RSU; receiving an ITS paging message from the first access point; and while in the communications range of the first access point in the ITS target area and in response to the received ITS paging message, causing a reselection of the first RSU.
  • the present invention provides a computer program product comprising at least one computer readable non-transitory memory medium having program code stored thereon, the program code which when executed by an apparatus cause the apparatus at least to perform the foregoing method.
  • the present invention provides a method comprising determining a location and at least a movement direction of a mobile terminal; determining at least one next RSU in an ITS target area based on the determined location and at least the movement direction of the mobile terminal; causing configuration information to be transmitted to the mobile terminal, wherein the configuration information defines the ITS target area; and causing an ITS paging message to be transmitted to the mobile terminal from the determined next RSU.
  • the present invention provides a computer program product comprising at least one computer readable non-transitory memory medium having program code stored thereon, the program code which when executed by an apparatus cause the apparatus at least to perform the foregoing method.
  • the present invention provides a method comprising receiving a location and at least a movement direction of an approaching mobile terminal; receiving configuration information for the approaching mobile terminal; causing ITS paging message to be transmitted to the mobile terminal; and receiving an indication that the approaching mobile terminal has performed reselection.
  • the present invention provides a computer program product comprising at least one computer readable non-transitory memory medium having program code stored thereon, the program code which when executed by an apparatus cause the apparatus at least to perform the foregoing method.
  • the present invention provides an apparatus comprising processing means arranged to: receive configuration information from a first access point, wherein the configuration information defines an ITS target area comprising at least the first access point and a first RSU; receive an ITS paging message from the first access point; and cause a reselection of the first RSU while in the communications range of the first access point in the ITS target area and in response to the received ITS paging message.
  • the present invention provides an apparatus comprising processing means arranged to determine a location and at least a movement direction of a mobile terminal; determine at least one next RSU in an ITS target area based on the determined location and at least the movement direction of the mobile terminal; cause the apparatus at least to cause configuration information to be transmitted to the mobile terminal, wherein the configuration information defines the ITS target area; and cause the apparatus at least to cause an ITS paging message to be transmitted to the mobile terminal from the determined next RSU.
  • the present invention provides an apparatus comprising processing means arranged to receive a location and at least a movement direction of an approaching mobile terminal; receive configuration information for the approaching mobile; cause an intelligent transportation system "ITS" paging message to be transmitted to the mobile terminal; and receive an indication that the approaching mobile terminal has performed reselection.
  • processing means arranged to receive a location and at least a movement direction of an approaching mobile terminal; receive configuration information for the approaching mobile; cause an intelligent transportation system "ITS" paging message to be transmitted to the mobile terminal; and receive an indication that the approaching mobile terminal has performed reselection.
  • the present invention provides an intelligent transportation system comprising an apparatus as hereinbefore described.
  • the present invention provides an intelligent transporation system arranged to operate as hereinbefore described.
  • Figure 1 is a schematic representation of an example ITS that may benefit from an embodiment of the present invention
  • Figure 2 is a block diagram of an example apparatus that may be embodied by an example mobile terminal in accordance with one embodiment of the present invention
  • Figure 3 is a system overview diagram illustrating an example ITS operating according to an embodiment of the present invention.
  • Figure 4 is a flow chart illustrating operations performed by an example mobile terminal in accordance with one embodiment of the present invention
  • Figure 5 is a flow chart illustrating operations performed by an example access point in accordance with one embodiment of the present invention
  • Figure 6 is a flow chart illustrating operations performed by an example RSU in accordance with one embodiment of the present invention.
  • Figure 7 is a signaling flow diagram illustrating an example ITS paging procedure for a mobile terminal terminated service in accordance with one 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
  • 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 method, apparatus and computer program product of an example embodiment of the present invention are configured to provide an ITS system based on cellular communications.
  • the cellular ITS system further may be implemented using LTE interfaces that enable various connections between mobile terminals, RSUs and access points.
  • LTE interfaces that enable various connections between mobile terminals, RSUs and access points.
  • an interface between a mobile terminal and an RSU may be based on an LTE mobile terminal to relay node air interface used on cellular bands, which may be referred to as an access link.
  • An example interface between the RSU and the access point may be based on an LTE relay node to access point interface used on cellular bands and referred to as the back haul link.
  • a direct connection between a mobile terminal and an access point may also be implemented based on an LTE mobile terminal to access point interface.
  • the example ITS further includes a mobile terminal that is configured to enter a ready state, such as an LTE RRC-READY state.
  • a ready state such as an LTE RRC-READY state.
  • the ready state enables the mobile terminal to listen for an ITS paging message from an RSU and to perform implicit handovers between RSUs as the mobile terminal is traveling within the ITS.
  • Such a state advantageously, for example, provides for faster movement between RSUs and at least partially accounts for the high mobility of a mobile terminal in an ITS system.
  • the example ITS system may also include an ITS target area that is defined by the communications range of an access point.
  • An ITS target area is generally defined by a plurality of RSUs that are in the communications range of an access point.
  • An ITS target area advantageously, for example allows for a security context to be maintained among RSU within an ITS target area, which further supports the high mobility of a mobile terminal.
  • a method, apparatus and computer program product of an example embodiment of the present invention also includes the use of ITS paging messages.
  • Such messages provide configuration information that includes, but is not limited to paging parameters, timing advance parameters, ITS message type or predefined resource configuration.
  • Figure 1 which includes a first communication device (e.g., mobile terminal 10) that is capable of communication via a access point 12, such as a base station, a macro cell, a Node B, an evolved Node B (eNB) or other access point or via an RSU 14 with a network 16 (e.g., a core network).
  • a first communication device e.g., mobile terminal 10
  • a access point 12 such as a base station, a macro cell, a Node B, an evolved Node B (eNB) or other access point or via an RSU 14 with a network 16 (e.g., a core network).
  • a network 16 e.g., a core network
  • While the network may be configured in accordance with LTE or LTE-Advanced (LTE-A), 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
  • an RSU 14 may be embodied as a transparent relay, without, for example, a cell ID, the RSU 14 may be configured to perform an initial cell access as a special mobile terminal to a macro-cell access point within coverage area.
  • a specified Type 1 non- transparent relay such as the RSU 14 may achieve downlink synchronization and perform initial cell access procedure over the air as a special mobile terminal.
  • the cell access procedure may also include uplink timing alignment, RRC connection configuration and/or security activation.
  • the RSU 14 may operate in a connected state, such as an RRC CONNECTED state.
  • the network 16 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 access point 12 and which may serve a respective coverage area.
  • the access point could 12 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
  • a communication device such as the mobile terminal 10 (also known as user equipment (UE) and/or an onboard unit (OBU)), may be in communication with other communication devices or other devices via the access point 12, the RSU 14 and, in turn, the network 16.
  • the communication device may include an antenna for transmitting signals to and for receiving signals from an access point 12 and/or the RSU 14.
  • the mobile terminal 10 may be a mobile communication device such as, for example, a vehicle-mounted transceiver unit, 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 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 may also include communication circuitry and corresponding hardware/software to enable communication with other devices and/or the network 16.
  • the mobile terminal 10, the access point 12 and/or the RSU 14 may be embodied as or otherwise include an apparatus 20 as generically represented by the block diagram of Figure 2. While the apparatus 20 may be employed, for example, by a mobile terminal 10, an access point 12 or an RSU 14, 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 communication with processing circuitry 22 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 functionalities described herein.
  • the processing circuitry 22 may include a processor 24 and memory 28 that may be in communication with or otherwise control a communication interface 26 and, in some cases, a user interface 29.
  • 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 user interface 29 may be in communication with the processing circuitry 22 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 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 apparatus 20 need not always include a user interface. For example, in instances in which the apparatus is embodied as an access point 12 and/or an RSU 14, the apparatus may not include a user interface. As such, the user interface is shown in dashed lines in Figure 2.
  • the communication interface 26 may include one or more interface mechanisms for enabling communication with other devices and/or networks.
  • the communication 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 16 and/or any other device or module in communication with the processing circuitry 22, such as between the mobile terminal 10, the access point 12 and the RSU 14.
  • 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 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 memory 28 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.
  • 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 28 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.
  • a method, apparatus and computer program product of an example embodiment of the present invention is configured to provide an ITS system over a cellular network.
  • the ITS system as described herein is configured to enable mobile terminals, such as mobile terminal 10, to perform initial macro-cell access and an establish a radio resource control (RRC) connection to an access point 12.
  • RRC radio resource control
  • non-access stratum (NAS)-level security and a mobile terminal's capabilities may be stored in a mobility management entity (MME).
  • MME mobility management entity
  • An access stratum (AS) level security may be stored in an access point, such as in a memory 28 of access point 12.
  • the data bearers may be removed and the mobile terminal may transition from a connected state to a ready state. For example, from an RRC CONNECTED state to a RRC READY state.
  • the AS security context is maintained as long as the mobile terminal 10 is within an ITS target area under the same access point.
  • a mobile terminal 10 while in a ready state, is configured to listen for ITS paging messages from an RSU 14.
  • the ITS paging messages may provide information for the mobile terminal 10 relating to terminated data bearer establishment.
  • the mobile terminal 10 while in the ready state, may then use the RACH for mobile terminal initiated data bearer establishment and/or location update to allow the network and/or an access point to trigger one or more RSUs 14 in a next ITS target area.
  • a change of RSU by the mobile terminal is triggered by ITS paging message 10 from the RSU 14 when data bearer is established.
  • the RSU 14 is generally a transparent relay for the mobile terminal 10
  • the mobile terminal 10 may perform reselection to another RSU 14 without signaling with the access point 12 and/or the network 14.
  • an RSU 14 cell change is an implicit cell reselection.
  • a handover command may not be necessary, and for example may only act to slow down the change of the cell and may also result in require frequent signaling.
  • a mobile terminal 10 while in a ready state, such as a RRC READY state, may perform an uplink timing alignment procedure to update a TA parameter.
  • a TA update may allow an access point 12 to forward an updated TA parameter of a mobile terminal 10 to an RSU 14 in an ITS paging message.
  • the access point 12 may also configure parameters for the uplink TA procedures of a mobile terminal 10 to ensure that a correct TA is known by a mobile terminal 10 in an instance in which the mobile terminal 10 is approaching and/or enters an ITS Target Area.
  • an RSU 14 may also determine an access point- mobile terminal RRC Connection establishment and initial security activation based on an ITS paging message, the RSU may also detect mobile terminal RACH preamble in RRC configured RACH resources. Thus, dedicated RRC signaling to setup the DRB may then proceed.
  • measurement report messages may be optional as handover cell change decisions are not necessarily handled by the network in some embodiments.
  • signaling between the mobile terminal 10 and the RSU 14 may be necessary in instances in which there is a user plane data transfer. See for example Figure 7.
  • FIG. 3 is an overview diagram illustrating an example ITS according to an embodiment of the present invention.
  • a mobile terminal such as mobile terminal 10, may be traveling along the arrow 30 within an ITS system as shown.
  • the mobile terminal at various times Tl , T2...T8 may experience different behaviors and may operate in different states.
  • Tl time
  • T2...T8 may experience different behaviors and may operate in different states.
  • there may be two access points 12a and 12b, with each access point, in this example, connected to two RSUs. Any number of access points and RSUs may be used in the example ITS systems as described herein.
  • an ITS target area 36 is defined by the combined communication range of the access points 12a and 12b, where each access point 12a- 12b has a defined range which is shown with reference to solid line 32.
  • an ITS target area may be defined by the communications range of a single access point, or may be defined by the communications range of a plurality of access points.
  • Each RSU 14a - 14d also has a defined range which is shown with reference to dashed lines 34.
  • the mobile terminal 10 may be switched on by access point 12a.
  • the mobile terminal then may also enter a connected mode (e.g. RRC CONNECTED) to receive at least part of the configuration information for the ITS target area 36, which includes in this example RSU A 14a and B 14b and access point A 12a, as well as access point RSU C 14c and D 14d and access point B 12b .
  • the mobile terminal 10 may transition to a ready state (e.g. RRC READY).
  • the ready state is entered into in this instance because the mobile terminal 10 has entered an access point area A 12a in the ITS target area that includes RSU A 14a and B 14a and has received the necessary configuration for each of the RSUs 14a and 14b.
  • the mobile terminal may enter the communications range of RSU A 14a and thus the mobile terminal 10 may perform reselection to RSU A 14a following distributed triggering via an ITS paging message from RSU A.
  • the mobile terminal may initiate a user data exchange with RSU A 14a and based on the data exchange may enter a connected mode. After the data exchange the mobile terminal is configured to enter a ready state instead of an idle state (e.g. RRC IDLE) because the mobile terminal is still in an ITS target area.
  • an idle state e.g. RRC IDLE
  • a mobile terminal 10 may be configured to perform reselection to RSU B 14b following distributed triggering via ITS paging by RSU B 14b.
  • the access point A 12a may be configured to initiate a user data exchange, and may then send an ITS paging message to the mobile terminal 10 over RSU B 14b.
  • the network and/or the access point A 12a may have determined that the mobile terminal 10 is traveling down a particular road, such as the movement defined with reference to arrow 30, and therefore may be configured to predict future movements of the mobile terminal 10.
  • the mobile terminal 10 may be configured to perform reselection to RSU C 14c.
  • RSU C 14c is in a different access point area B 12b in an ITS target area from RSU B 14b. Therefore, because of the transition from access point A 12a to access point B 12b, the mobile terminal 10 may receive the security context information or configuration information for access point B 12b and related RSUs 14 C and 14 D and then enter an idle state after reselection of access point B 12b in an instance in which the mobile terminal 10 is not yet within a communications range of RSU C 14c.
  • access point B 12b and/or the network may initiate a user data exchange and may cause an ITS paging message to be transmitted to a mobile terminal, such as the mobile terminal 10.
  • the ITS paging message may be sent throughout the ITS target area.
  • the mobile terminal 10 may enter a connected state to receive configuration information for RSU C 14c and D 14d. After the data exchange the mobile terminal may enter a ready state. At time T8, the mobile terminal may enter an idle state when leaving the communication range of RSU 14 D 14d.
  • FIGS 4-6 illustrate example operations performed by a method, apparatus and computer program product, such as apparatus 20 of Figure 2 in accordance with one embodiment of the present invention are illustrated.
  • 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.
  • one or more of the procedures described above may be embodied by computer program instructions.
  • the computer program instructions which embody the procedures described above may be stored by a memory device 28 of an apparatus employing an embodiment of the present invention and executed by a processor 24 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 provides for implementation of the functions specified in the flowcharts' block(s).
  • These computer program instructions may also be stored in a non-transitory computer-readable storage memory that may direct a computer or other programmable apparatus to function in a particular manner, such that the instructions stored in the computer-readable storage memory produce an article of manufacture, the execution of which implements the function specified in the flowcharts' block(s).
  • 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 flowcharts' block(s).
  • the operations of Figures 3 and 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 4-6 define an algorithm for configuring a computer or processing circuitry 22, e.g., processor, to perform an example embodiment.
  • a general purpose computer may be provided with an instance of the processor which performs the algorithm of Figures 4-6 to transform 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 and combinations of operations for performing the specified functions. It will also be understood that one or more blocks of the flowchart, 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.
  • Figure 4 is a flow chart illustrating operations performed by an example mobile terminal as the mobile terminal moves through one or more ITS target areas in accordance with one embodiment of the present invention.
  • the apparatus 20 embodied, for example, by a mobile terminal 10, may include means, such as the processing circuitry 22, the processor 24, the communications interface 26 or the like, for receiving configuration information from a first access point, wherein the configuration information defines an ITS target area comprising at least a first access point and a first RSU.
  • the ITS target area 36 is defined by a combined communications range of the access points 12a and 12b, where each access point 12a- 12b has a defined range which is shown with reference to solid line 32.
  • the apparatus 20 may include means, such as the processing circuitry 22, the processor 24, the communications interface 26 or the like, for receiving an ITS paging message from the first access point.
  • the apparatus 20 embodied, for example, by a mobile terminal 10 may include means, such as the processing circuitry 22, the processor 24, or the like, to cause a reselection of the first RSU while in the communication range of a first access point in an ITS target area and in response to the received ITS paging message.
  • the apparatus 20 embodied, for example, by a mobile terminal 10, may include means, such as the processing circuitry 22, the processor 24, or the like, for causing a user data exchange to be initiated with the first RSU while in a connected state.
  • An ITS paging message and resulting user data exchange is shown for example with reference to Figure 7.
  • the apparatus 20 embodied, for example, by a mobile terminal 10, may include means, such as the processing circuitry 22, the processor 24, or the like, for causing reselection to a second RSU while in the communication range of the first access point in an ITS target area while in a ready state in an instance in which a distributed triggering via an ITS paging message is received, wherein the second RSU is in data communication with the first access point.
  • the mobile terminal may perform reselection to another RSU within an ITS target area without the need to signal to the network.
  • the apparatus 20 embodied, for example, by a mobile terminal 10, may include means, such as the processing circuitry 22, the processor 24, the communications interface 26 or the like, for causing reselection to a third RSU in the communication range of a second access point in the ITS target area, wherein the third RSU is in data communication with a second access point in the ITS target area.
  • the apparatus 20 may include means, such as the processing circuitry 22, the processor 24, or the like, receives an ITS paging message, wherein the ITS paging message comprises configuration information for the second access point and at least the third RSU.
  • Figure 5 is a flow chart illustrating operations performed by an example access point in accordance with one embodiment of the present invention.
  • the apparatus 20 embodied, for example, by an access point 12, may include means, such as the processing circuitry 22, the processor 24, or the like, for determining at least one next RSU in an ITS target area based on the determined location and at least the movement direction of the mobile terminal.
  • an apparatus 20 embodied, for example, by an access point 12 may be configured to determine an RSU to prepare as the next target RSU for a mobile terminal.
  • a next RSU may be chosen based on (i) the deterministic movement of the mobile terminal based on information gathered by the ITS system, (ii) mobile terminal positioning capability with location updated as needed such as by a global position system (e.g. as a mobile terminal enters a new ITS target area and/or after a predetermined time period); and/or the target RSU is the next RSU on the road after the source RSU, in the direction of the mobile terminal movement.
  • the apparatus 20 may include means, such as the processing circuitry 22, the processor 24, the communications interface 26 or the like, for causing configuration information to be transmitted to the mobile terminal, wherein the configuration information defines the ITS target area.
  • the configuration information may provide connection information for a plurality of RSUs that are connected to a single access point or a plurality of related access points.
  • the apparatus 20 embodied, for example, by an access point 12 may include means, such as the processing circuitry 22, the processor 24, the communications interface 26 or the like, for causing an ITS paging message to be transmitted to the at least one next RSU.
  • the access point may, as is shown in operation 504, the apparatus 20 embodied, for example, by an access point 12, may Cause an ITS paging message to be transmitted to the mobile terminal from the determined next RSU.
  • Example ITS paging messages are further described with reference to Figure 7.
  • the apparatus 20 may include means, such as the processing circuitry 22, the processor 24, the communications interface 26 or the like, for causing a determined location and at least the movement of direction of the mobile terminal to be transmitted to at least one next access point.
  • the apparatus 20 embodied, for example, by an access point 12 may include means, such as the processing circuitry 22, the processor 24, the communications interface 26 or the like, for receiving a RACH message and causing an RSU to be triggered in the communication range of a next access point in the ITS target area.
  • an RSU may also include as is shown in operation 514, the apparatus 20 embodied, for example, by an access point 12, may include means, such as the processing circuitry 22, the processor 24, the communications interface 26 or the like, for receiving allocation update message and causing an RSU to be triggered in the communication range of a next access point in the ITS target area.
  • Operations 512 and 514 preferably are configured to determine and trigger a next RSU on a mobile terminals path.
  • Figure 6 is a flow chart illustrating operations performed by an example RSU in accordance with one embodiment of the present invention.
  • the apparatus 20 embodied, for example, by an RSU 14 may include means, such as the processing circuitry 22, the processor 24, the communications interface 26 or the like, for receiving a location and at least a movement direction of an approaching mobile terminal.
  • the apparatus 20 embodied, for example, by an RSU 14 may include means, such as the processing circuitry 22, the processor 24, the communications interface 26 or the like, for receiving configuration information for the approaching mobile terminal.
  • the apparatus 20 embodied, for example, by an RSU 14 may include means, such as the processing circuitry 22, the processor 24, the communications interface 26 or the like, for receiving timing advance information for the approaching mobile terminal.
  • the apparatus 20 In response to the received location and movement direction, configuration information and timing advance information for the approaching mobile terminal, as is shown in operation 608, the apparatus 20 embodied, for example, by an RSU 14, may include means, such as the processing circuitry 22, the processor 24 or the like, for causing at least one receive window to be adjusted based on the received timing advance information.
  • the RSU is further configured to, as is shown in operation 610, the apparatus 20 embodied, for example, by an RSU 14, may include means, such as the processing circuitry 22, the processor 24or the like, for causing an ITS paging message to be transmitted to the mobile terminal.
  • the apparatus 20 may include means, such as the processing circuitry 22, the processor 24, the communications interface 26 or the like, for receiving an indication that the approaching mobile terminal indicating that it has performed reselection.
  • FIG. 7 is a signaling flow diagram illustrating an example ITS paging procedure for a mobile terminal terminated service in accordance with one embodiment of the present invention.
  • a mobile terminal 10 may be configured to perform initial macro-cell access and establish an RRC connection with an access point 12. Once a connection is established, the data bearers may then be released, which then allows the mobile terminal 10 to enter a ready state (e.g. RRC READY). Further, NAS-level security and determined mobile terminal 10 capabilities may be stored in an MME 18.
  • the RSU 14 receives an RRC configuration of a mobile terminal, such as mobile terminal 10, via an ITS paging message sent by the NAS- MME entity such as a system information block (SIB)-linked RadioResourceConfigCommon information element (IE), the message may contain defaultPagingCycle and prach-Configurationlndex, Paging Radio Network Temporary Identifier (P-RNTI), and/or a TA parameter.
  • An RSU 14 may be configured to determine the access point - mobile terminal RRC Connection establishment and initial NAS-layer security activation via central triggering, which, for example, saves time in mobile terminal-RSU connection establishment.
  • central triggering may include, an MME 18, that is configured to trigger an RSU, such as RSU 14 of an approaching mobile terminal, such as mobile terminal 10, within an ITS target area via ITS paging messages.
  • the MME 18 may then subsequently configure the RRC connection for the triggered RSU 14 and mobile terminal 10 including RRC message for connection establishment via signal radio bearer (SRB)O, dedicated RRC and NAS messages via SRBl for security activation.
  • SRB signal radio bearer
  • the RSU 14 may be configured to cause an ITS paging message to be transmitted to the mobile terminal 10 to complete data radio bearer setup.
  • One such method of transmission includes distributed triggering.
  • Example distributed triggering includes, an RSU 14 that may relay NAS messages on SRB2 and RRC messages on SRBl from an MME 18 to a mobile terminal 10 once security is activated.
  • distributed triggering allows for the fast set up and release of data radio bearer between RSU 14 and the mobile terminal 10, with the data radio bearer (DRB) setup occurring when the mobile terminal 10 enters the RSU 14 cell coverage and the DRB release occurring when the mobile terminal 10 leaves the RSU 14 coverage area.
  • DRB data radio bearer
  • an ITS end-to-end service may be provided by one-to-one mapping of the DRB to an evolved packet system (EPS) bearer in the internet protocol connectivity layer and an external bearer to a WAN (e.g. internet) linking mobile terminals to the ITS server / machine type communications (MTC) server, and MTC users for machine to machine (M2M) applications.
  • EPS evolved packet system
  • MTC machine type communications
  • the MME 18 send an ITS paging message to the access point 12.
  • access point 12 is configured to forward the ITS paging message to RSU 14.
  • RSU 14 may be in a connected state, such as in RRC CONNECTED state.
  • the ITS paging is sent to indicate to RSU 14 that a mobile terminal 10 is approaching the ITS target area.
  • the ITS paging message may include but is not limited to mobile terminal paging parameters, a TA parameter of the mobile terminal 10, an indication of a type of ITS message to be transmitted to the mobile terminal 10, and/or predefined resource configuration for the mobile terminal 10 paging and/or an ITS paging message.
  • an RSU 14 may be configured to send ITS paging message to trigger a mobile terminal 10.
  • the mobile terminal 10 may be in a ready state (e.g. RRC READY) and RSU 14 already may have the TA parameter of the mobile terminal 10 based on signal 702, thus a RACH preamble from the mobile terminal 10 to RSU 14 and a RACH response from RSU 14 to mobile terminal 10 may not be necessary.
  • an ITS paging may be considered as an RRC message (e.g. as specified in TS 36.331, which is hereby incorporated by reference) with additional ITS paging fields.
  • enhanced universal mobile telecommunications system terrestrial radio accesss network E-UTRAN
  • E-UTRAN enhanced universal mobile telecommunications system terrestrial radio accesss network
  • An ITS paging message may also include ITS specific parameters.
  • ITS-RSU-Paging and/or ITS-mobile terminal-Paging may be mutually exclusive.
  • An example ITS paging message may include: pagingRecordList
  • ITS-RSU-Paging ITS-mobile terminal-Paging
  • the ITS-RSU-Paging information may point to OBUProximitylndication message giving the location indication of a mobile terminal and the ITS-OBU-Paging may point to ITSTargetAreaConfiguration message giving the pre-defined RSU resources.
  • the RRC messages OBUProximitylndication and ITSTargetAreaConfiguration may be transmitted on SRB1.
  • Paging messages may also include other optional fields in case they are relevant. For example, a non-exclusive listing of the fields of the RRC messages is shown below: OB UProximitylndication message
  • the access point cell specific random access parameters and static physical layer parameters may not be included in the RRC messages above since the RSU 14 is in a connected state, such as in a RRC CONNECTED state, and the mobile terminal 10 may be in a ready state, such as a RRC READY state, when receiving the ITS paging message.
  • ITS paging messages may be sent as ordinary paging messages, as specified by E-UTRAN RRC specifications, and therefore SRB may not be necessary.
  • ITS messages OBUProximitylndication and ITSTargetAreaConfiguration may be sent over SRBl signalling.
  • the mobile terminal 10 may also receive paging messages in addition to ITS paging messages.
  • the RSU 14 may send RRCConnectionSetup to send SRBl parameters.
  • mobile terminal 10 may send RRCConnectionSetupComplete via SRBl to complete SRBl establishment.
  • the RSU 14 may send RRCConnectionReconfiguration via SRBl to establish SRB2 and DRB.
  • mobile terminal 10 may send RRCConnectionReconfigurationComplete via SRBl .
  • RRCConnectionSetupComplete may be omitted, and signal 712, the RRCConnectionReconfiguration message, may be sent after, or together with the ITS Paging message.
  • the mobile terminal 10 may have received RSU specific parameters (for all RSUs connected to particular access point, such as access point 12) when entering the access point 12 for the first time. Therefore, for example, it may enough to include only a pointer to these resources in an ITS Paging message.
  • a user plane data transfer may occur.
  • the mobile terminal 10 may leave a connected state, such as an RRC CONNECTED state, and may enter a ready state, such as a RRC READY state.
  • a ready state such as an RRC READY state
  • the mobile terminal 10 may enter an idle state, such as an RRC IDLE state, and start an LTE session setup.
  • a timer may be activate, and at the timers expiration a mobile terminal 10 may be configured to enter an idle state, such as RRC IDLE.
  • the mobile terminal 10 may also initiate central triggering by an access point 12 to re-enter a ready state, such as an RRC READY.
  • Example state transitions to and from a ready state such as an RRC READY state include, but are not limited to the following, the transition from RRC CONNECTED -> RRC-READY may occur at the conclusion of a user plane data transfer.
  • the transition from RRC_READY->RRC_IDLE my occur in an instance in which a mobile terminal 10 moves out of coverage of existing access point, in some cases an access may determine that a mobile terminal 10 has entered idle, because the mobile terminal 10 is expected to move along a road under a next RSU, which is not in the range of the existing access point; In an instance in which a mobile terminal 10 is within and ITS target area without data transfer, for example after a timer expires and/or In an instance in which a mobile terminal.
  • the transition from RRC READY- >RRC_CONNECTED may occur as a response to an ITS Paging message.
  • the apparatus 20, method and computer program product as described herein enables, for example, fast setup and release of RRC resources for mobile terminals in an ITS. Further, as described herein the signaling load is reduced as well as there is a reduction in RSU transmission interference, thus allowing for the implementation of the example cellular based ITS system as described herein.

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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 progiciel mis en oeuvre, selon un mode de réalisation illustratif, pour créer un environnement ITS cellulaire. Cet environnement ITS cellulaire peut être configuré sur la base d'interfaces LTE. Pour cela, un procédé consiste à recevoir d'un premier point d'accès des informations de configuration définissant une zone ITS cible comprenant au moins le premier point d'accès et une première RSU. Un procédé consiste également à recevoir un radiomessage ITS du premier point d'accès. Un procédé consiste en outre à resélectionner la première RSU lorsqu'elle se trouve dans la portée de communication du point d'accès dans la première zone ITS cible et après réception du radiomessage ITS.
PCT/IB2012/055167 2011-09-27 2012-09-27 Systèmes de communications WO2013046154A1 (fr)

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GB1116640.2 2011-09-27
US13/246,462 US8892028B2 (en) 2011-09-27 2011-09-27 Method and apparatus for a cellular assisted intelligent transportation system
US13/246,462 2011-09-27
GB201116640A GB2496836B8 (en) 2011-09-27 2011-09-27 Communications systems

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