EP3782391A1 - Dispositif mobile multiantenne et dispositifs de réseau pour communications sans fil - Google Patents

Dispositif mobile multiantenne et dispositifs de réseau pour communications sans fil

Info

Publication number
EP3782391A1
EP3782391A1 EP18723814.2A EP18723814A EP3782391A1 EP 3782391 A1 EP3782391 A1 EP 3782391A1 EP 18723814 A EP18723814 A EP 18723814A EP 3782391 A1 EP3782391 A1 EP 3782391A1
Authority
EP
European Patent Office
Prior art keywords
mobile device
network device
antenna
information
message
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
EP18723814.2A
Other languages
German (de)
English (en)
Inventor
Panagiotis SPAPIS
Serkan AYAZ
Jose Francisco MONSERRAT
Sandra ROGER
Apostolos KOUSARIDAS
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huawei Technologies Co Ltd
Original Assignee
Huawei Technologies Co Ltd
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 Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Publication of EP3782391A1 publication Critical patent/EP3782391A1/fr
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0602—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using antenna switching
    • H04B7/0608—Antenna selection according to transmission parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0691—Hybrid systems, i.e. switching and simultaneous transmission using subgroups of transmit antennas
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/14—Direct-mode setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/22—Processing or transfer of terminal data, e.g. status or physical capabilities
    • H04W8/24—Transfer of terminal data

Definitions

  • the present invention relates to a mobile device and a network device for wireless communications, respectively.
  • the mobile device is configured to communicate particularly with multiple antennas with another mobile device
  • the network device is configured to select the multiple antennas used for such communication between the mobile devices.
  • the mobile device and network device of the invention are especially suited for Vehicle-to-Everything (V2X) communications, e.g. Vehicle-to- Vehicle (V2V), vehicle-to-infrastructure and/or vehicle-to-pedestrian communications.
  • V2X Vehicle-to-Everything
  • V2V Vehicle-to- Vehicle
  • V2V Vehicle-to-infrastructure
  • vehicle-to-pedestrian communications BACKGROUND
  • FIG. 18 provides an overview of a sidelink communication scenario, which exploits the diversity of multi-antenna links.
  • a transmitter vehicle and two receiver vehicles which are equipped with multiple antennas, are involved in a wireless communication.
  • every vehicle has a designated set of antennas readily operating to carry out the wireless communication.
  • Multi-link connectivity is not enabled in a coordinated manner.
  • a User Equipment can transfer radio access capability information to the E- UTRAN using the UE capability transfer procedure.
  • UE User Equipment
  • MIMO sidelink with antennas located in different parts of the vehicle has already been considered in literature, showing important benefits in terms of capacity increase and reliability.
  • 3GPP standard addressing MIMO in sidelink.
  • the majority of conventional solutions for massive MIMO require channel knowledge, which is a drawback for vehicular communications due to mobility.
  • Other solutions for antenna selection/pairing for MIMO device-to-device (D2D) systems rely on multi-path channel state information (unsuitable for high mobility environments), and their complexity grows with the number of antennas and D2D pairs.
  • the present invention aims to improve the conventional solutions.
  • the present invention aims to extend conventional implementations for wireless communications, e.g. 5G Medium Access Control (MAC), RRC and Radio Resource Management (RRM) procedures, in order to exploit the diversity of the multi-antenna links. Thereby, especially wireless sidelink communications are considered.
  • the present invention has in particular the aim to select the most appropriate set of antennas for wireless communications among two mobile devices, e.g. for V2V communications between two vehicles, particularly taking into account road and radio conditions.
  • the invention desires to enable a coordinated establishment of multiple links, using different antennas among two or more mobile devices for specific (e.g.
  • V2X V2X services, in order to increase reliability, capacity and improve latency of the communications.
  • network-based mode 3 in LTE standard nomenclature
  • autonomous mode 4 in LTE standard nomenclature
  • multi-antenna resource control and allocation should be considered.
  • the objective of the present invention is to provide a network device and mobile device, and a method, which enable and support antenna selection for improved wireless communications.
  • the present invention aims at enabling the support of antenna selection for improved wireless V2X communications.
  • the present invention proposes enhancing wireless, particularly V2X communications, based on antenna selection for mobile device to mobile device (e.g. vehicles’ sidelink) communications.
  • the antenna selection decision can thereby be made: a) in a centralized manner (network-based control/coordination) e.g., by a Base Station (BS), Access Management Function (AMF) in 5G network, cloud server operated by the MNO or not or any other network device, or b) in a distributed manner by autonomous mobile devices (e.g. vehicles; vehicle-based control/coordination).
  • BS Base Station
  • AMF Access Management Function
  • 5G network 5G network
  • cloud server operated by the MNO or not or any other network device
  • autonomous mobile devices e.g. vehicles; vehicle-based control/coordination
  • the present invention generally provides a simple low-complexity approach to select the best subset of antennas in transmission and reception based on context information to improve e.g. SISO/MIMO V2X.
  • the advantages offered are generally the following:
  • a first aspect of the present invention provides a mobile device for wireless communications, the mobile device comprising more than one antenna and being configured to transmit capability information to a network device and/or another mobile device, the capability information including: an indication regarding the capability of the mobile device to communicate using multiple antennas, an antenna characteristic of at least one of the multiple antennas.
  • the antenna characteristics may comprise a number of antenna elements, the antennas’ location, frequency dependent parameters, radiation pattern, a vehicle type (e.g., bus, van), a location of a vehicle, etc.
  • a vehicle type e.g., bus, van
  • the selection of an antenna set for the communication between the mobile device of the first aspect and the other mobile device supported can be carried out either at the network device or in a cooperative manner between at least the mobile device and the other mobile device.
  • the set of antennas can be selected such that improved communications in terms of reliability capacity and latency are achieved.
  • the mobile device is configured to transmit the capability information in a control plane message and/or in an application layer message to the network device and/or to the other mobile device.
  • a control plane message comprises, in particular, a Radio Control User Equipment Information Message, similar to the Radio Resource Control User Equipment (RRC UE) Capability Information message in LTE.
  • An application layer message comprises, in particular, a Cooperative Awareness Message (CAM).
  • CAM Cooperative Awareness Message
  • the mobile device is further configured to transmit support information to the network device and/or the other mobile device, the support information including at least one of: a radio condition and/or network condition, an environment condition, particularly a road environment condition.
  • the mobile device is further configured to transmit support information to the network device and/or the other mobile device, the support information including at least one of: an orientation and/or relative position of at least one other mobile device, in particular with respect to the mobile device, a direction of movement and/or speed and/or estimated short-term path of at least one other mobile device.
  • the mobile device is further configured to transmit support information to the network device and/or the other mobile device, the support information including at least one of: a type of service and/or a transmission mode (e.g., multicast, unicast, broadcast), a service duration, service periodicity and/or service characteristic.
  • a type of service and/or a transmission mode e.g., multicast, unicast, broadcast
  • the mobile device is further configured to transmit the support information in one of the following manners: on demand from an external device, in particular a network device and/or another mobile device; without demand, in particular a connection request message; periodically, in particular a measurement report.
  • the support information can be sent in one or more of: an Uplink and/or a downlink control plane message; a Sidelink control plane message; a Dynamic Reporting message.
  • an RRC Connection Process message and/or a Non-Access Stratum, NAS, Service Request Information message, and/or RRC Sidelink UE Information message For example, an RRC Connection Process message and/or a Non-Access Stratum, NAS, Service Request Information message, and/or RRC Sidelink UE Information message.
  • the mobile device is further configured to determine an antenna set, in particular for usage by the mobile device for communicating with the other mobile device, in particular based on a received capability information and/or support information from the other mobile device, and transmit information regarding the determined antenna set to said other mobile device.
  • the mobile device can determine the antenna set without help of the network.
  • the transmission can be part of the transmission of the capability information as defined in the first aspect as such.
  • An antenna set can comprise antenna configuration for the mobile device and/or for other mobile devices. The determination of the antenna set could involve two communicating mobile devices or a group of mobile devices.
  • the mobile device is configured to transmit the information regarding the determined antenna set in a control plane sidelink message, in particular in at least one of a: SCI message, Sidelink UE-to-UE Information message, RRC-like Sidelink message.
  • the mobile device is further configured to allocate a set of resources for communication with the other mobile device using the determined antenna set.
  • the mobile device is further configured to receive information comprising an antenna set to be used for communicating with another mobile device from the network device and/or another mobile device, in particular the another mobile device.
  • the information on the antenna set can comprise information for its own antennas regarding which antennas should be used for the communication with the other mobile device. And it can comprise information of one or more antennas from the other device that should be used to configure the transmission, in particular to configure the beam pointing, etc.
  • the determination of the antenna set can be performed according to one or more of the following manners: according to a pre defined rule; upon a request by another mobile device and/or a network device; repeatedly, in particular based on a channel measurement.
  • a second aspect of the present invention provides a network device for mobile communications, the network device being configured to receive capability information from a mobile device, the capability information including: an indication regarding a capability of the mobile device to communicate using multiple antennas, an antenna characteristic of at least one of the multiple antennas of the mobile device, determine an antenna set to be used by the mobile device for communicating with another mobile device based on the received capability information, and transmit information about the antenna set to the mobile device.
  • the network device can determine the antenna set based on the received information such that communication between the mobile device and the other mobile device is significantly improved, particularly with respect to reliability, capacity and latency, using the determined antennas.
  • the antenna set may include one of the following:
  • Tx antennas of a transmitting mobile device for communicating with a group or a specific receiving mobile device.
  • Tx antennas and Rx antennas of a transmitting mobile device for communication with a group or a specific receiving mobile device.
  • Tx antennas and Rx antennas for a group of mobile device that participate to a service.
  • the network device is further configured to notify the determined antenna set to the mobile device and optionally to the other mobile device.
  • the network device is configured to notify the determined antenna set in a control plane message, in particular at least one of a: Radio Resource Control message or any Radio Control message, Downlink Control Information, DCI, message and/or Sidelink Control Information, SCI, message.
  • a control plane message in particular at least one of a: Radio Resource Control message or any Radio Control message, Downlink Control Information, DCI, message and/or Sidelink Control Information, SCI, message.
  • the network device is configured to receive support information from the mobile device in one of the following manners: on demand from an external device, in particular a network device and/or another mobile device; without demand, in particular a connection request message; periodically, in particular measurement report.
  • the support information can include at least one of: a radio condition and/or network condition; an environment condition, particularly a road environment condition; an orientation and/or relative position of at least one other mobile device with respect to the mobile device; a direction of movement and/or speed and/or estimated short-term path of at least one other mobile device; a type of service and/or a transmission mode; a service duration, service periodicity and/or service characteristic.
  • the network device is configured to additionally base the determination of the antenna set on the support information. That means, the network device is configured to determine the antenna set based on the capability information and the support information. This significantly improves the determination of the best antenna set.
  • the determination of the antenna set can be performed according to one or more of the following manners: according to a pre defined rule; upon a request by another mobile device and/or a further network device; repeatedly, in particular based on a channel measurement.
  • the network device is configured to disseminate the support information received from the mobile device to one or more other mobile devices.
  • the network device is configured to allocate a set of resources for communication of the mobile device with the other mobile device using the determined antenna set.
  • the network device is configured to allocate a first subset of the set of resources to a first subset of the antenna set and allocate a second subset of the set of resources to a second subset of the antenna set.
  • the network device is configured to transmit the allocated set and/or subsets of resources to the mobile device, particularly in a Downlink Control Information (DCI) message.
  • DCI Downlink Control Information
  • a third aspect of the present invention provides a method for a mobile device, the method comprising signaling capability information to a network device and/or another mobile device, the capability information including: an indication regarding the capability of the mobile device to communicate using multiple antennas, an antenna characteristic of at least one of the multiple antennas.
  • the method comprises transmitting the capability information in a control plane message and/or in an application layer message to the network device and/or to the other mobile device.
  • the method comprises transmitting support information to the network device and/or the other mobile device, the support information including at least one of: a radio condition and/or network condition, an environment condition, particularly a road environment condition.
  • the method comprises transmitting support information to the network device and/or the other mobile device, the support information including at least one of: an orientation and/or relative position of at least one other mobile device, in particular with respect to the mobile device, a direction of movement and/or speed and/or estimated short-term path of at least one other mobile device.
  • the method comprises transmitting support information to the network device and/or the other mobile device, the support information including at least one of: a type of service and/or a transmission mode, a service duration, service periodicity and/or service characteristic.
  • the method comprises transmitting the support information in one of the following manners: on demand from an external device, in particular a network device and/or another mobile device; without demand, in particular a connection request message; periodically, in particular a measurement report.
  • the method comprises determining an antenna set, in particular for usage by the mobile device for communicating with the other mobile device, in particular based on a received capability information and/or support information from the other mobile device, and transmit information regarding the determined antenna set to said other mobile device.
  • the method comprises transmitting the information regarding the determined antenna set in a control plane sidelink message, in particular in at least one of a: SCI message, Sidelink UE-to-UE Information message, RRC- like Sidelink message.
  • the method comprises allocating a set of resources for communication with the other mobile device using the determined antenna set.
  • the method comprises receiving information comprising an antenna set to be used for communicating with another mobile device from the network device and/or another mobile device, in particular the another mobile device.
  • the determination of the antenna set can be performed according to one or more of the following manners: according to a pre defined rule; upon a request by another mobile device and/or a network device; repeatedly, in particular based on a channel measurement.
  • a fourth aspect of the present invention provides a method for network device, the method comprising receiving capability information from a mobile device, the capability information including: an indication regarding a capability of the mobile device to communicate using multiple antennas, an antenna characteristic of at least one of the multiple antennas of the mobile device, determine an antenna set to be used by the mobile device for communicating with another mobile device based on the received capability information.
  • the method comprises notifying the determined antenna set to the mobile device and optionally to the other mobile device.
  • the method comprises notifying the determined antenna set in set in a control plane message, in particular at least one of a: RRC Connection Reconfiguration message, Downlink Control Information, DCI, message and/or Sidelink Control Information, SCI, message.
  • the method comprises receiving support information from the mobile device in one of the following manners: on demand from an external device, in particular a network device and/or another mobile device; without demand, in particular a connection request message; periodically, in particular measurement report.
  • the method comprises additionally basing the determination of the antenna set on the support information.
  • the determination of the antenna set can be performed according to one or more of the following manners: according to a pre defined rule; upon a request by another mobile device and/or a further network device; repeatedly, in particular based on a channel measurement.
  • the method comprises disseminating the support information received from the mobile device to one or more other mobile devices.
  • the method comprises allocating a set of resources for communication of the mobile device with the other mobile device using the determined antenna set.
  • the method comprises allocating a first subset of the set of resources to a first subset of the antenna set and allocate a second subset of the set of resources to a second subset of the antenna set.
  • the method comprises transmitting the allocated set and/or subsets of resources to the mobile device, particularly in a DCI message.
  • FIG. 1 shows a mobile device according to an embodiment of the present invention.
  • FIG. 2 shows a network device according to an embodiment of the present invention.
  • FIG. 3 shows an exemplary decision-making process for antenna set selection at a network device according to an embodiment of the present invention.
  • FIG. 4 shows exemplarily a message sequence chart for indication of multi-antenna capabilities in RRC.
  • FIG. 5 shows exemplarily a message sequence chart with options to report multi antenna context information from mobile devices.
  • FIG. 6 shows an exemplary configuration of context information reporting elements and periodicity.
  • FIG. 7 shows an initial antenna selection and update of antenna selection exemplarily using RRC-ConneetionReconfiguration.
  • FIG. 8 shows a dynamic antenna selection exemplarily using Scheduling Grant messages (DCI and SCI).
  • FIG. 9 shows the use of DCI 5A bits for antenna selection.
  • FIG. 10 shows downlink signaling for dynamic antenna selection based on DCI.
  • FIG. 11 shows uplink signaling for dynamic antenna selection based on DCI.
  • FIG. 12 shows an example of cooperative antenna selection for transmission of messages from mobile devices (Vehicle 2 to Vehicle 1 and Vehicle 3) with signaling.
  • FIG. 13 Notification of antenna selection using SCI.
  • FIG. 14 shows a signaling to setup signaling radio bearer 3.
  • FIG. 15 shows exemplary antenna selection fields for configuration using
  • FIG. 16 shows a method according to an embodiment of the present invention.
  • FIG. 17 shows a method according to an embodiment of the present invention.
  • FIG. 18 shows an overview of a conventional sidelink communication scenario, which exploits the diversity of the multi-antenna links.
  • FIG. 1 shows a mobile device 100 comprising more than one antenna 101 according to an embodiment of the present invention.
  • the mobile device 100 is configured for wireless communications, for instance, with a network device 110 and/or another mobile device 100 (which may have the same capabilities as the device 100).
  • the mobile device 100 may for instance be a UE and/or provided at a vehicle. In the latter case, it can communicate wirelessly (V2V) with the other mobile device 100, provided at another vehicle.
  • the mobile device 100 can be configured for V2X communications.
  • the mobile device 100 is configured to transmit capability information 102 to the network device 110 and/or to the other mobile device 100.
  • This capability information 102 includes at least an indication 103 regarding the capability of the mobile device 100 to communicate using multiple antennas 101, and at least one antenna characteristic 104 of at least one of the multiple antennas 101 of the mobile device 100.
  • FIG. 2 shows accordingly a network device 110 according to an embodiment of the present invention.
  • the network device 110 is configured for wireless communications, for instance, with the mobile device 100 and/or the other mobile device 100.
  • the network device 110 may for instance be a BS or other network access node.
  • the network device 110 can communicate wirelessly with the mobile devices 100, provided e.g. at vehicles.
  • the network device 110 may be configured for Cellular Intelligent Transport Systems (C-TSI) communications.
  • C-TSI Cellular Intelligent Transport Systems
  • the network device 110 is configured to transmit capability information 102 from a mobile device 100.
  • This capability information 102 includes at least an indication 103 regarding a capability of the mobile device 100 to communicate using multiple antennas 101, and at least one antenna characteristic 104 of at least one of the multiple antennas 101 of the mobile device 100.
  • the network device 100 is configured to determine an antenna set to be used by the mobile device 100 for communicating with another mobile device 100 based on the received capability information 102.
  • the network device 100 is also configured to transmit information 200 about the antenna set to the mobile device 100.
  • the mobile device 100 shown in FIG. 1 and the network device 110 shown in FIG. 2 enable the selection of the antenna set out of the multiple antennas 101 of the mobile device 100 for a better (i.e. increased reliability and capacity and improved latency) wireless communication with the other mobile device 100 (or multiple other mobile devices 100).
  • the mobile device 100 and network device 110 shown in FIG. 1 and FIG. 2, respectively, can especially enhance V2V communications, allowing for multi-antenna selection, when using the sidelink between mobile device 100 at one vehicle and the other mobile device 100 at another vehicle.
  • Both network-based (mode 3 in LTE standard) and autonomous (mode 4 in LTE standard) multi-antenna resource control and allocation can thereby be considered.
  • the solution of the present invention - based on the mobile device 100 and the network device 110 - includes not only the antenna set selection and the associated signaling by the mobile device 100 to inform the network device 110 about the multi-antenna communication capabilities 103 and the antenna characteristics 104 of the multiple antennas 101, but also signaling of e.g. (vehicle) context information for the further support of the selection of the best antenna set, or signaling that notifies the mobile device 100 about the selection or any update in the selected antenna set. Further, the invention also includes scheduling procedures to allocate resources in such a use case scenario, particularly by using e.g. standard measurements.
  • FIG 3 shows an overview of various exemplary steps for a network-based decision making process at a network device 110, when one or more mobile devices 100 of request multi antenna V2V communications for a specific V2X service.
  • the network device 110 can identify antennas 101 supported by the involved vehicles (i.e. mobile devices 100). Then, the network device 110 may check the service requirements of V2X. Then, the network device 110 may check road environment conditions (e.g. intersections, obstacles) and relative positions between the mobile devices 100. The network device 110 may also check radio conditions. Finally, the network device 110 is configured to decide on the antenna set to be used for specific V2X service by the involved vehicles 100. This decision may be taken at e.g. a BS, a core network entity or a cloud server as the network device 110.
  • the mobile device 100 may inform the network device 110 (BS) about its capability 103 to communicate using multiple antennas 101 and their characteristics 103 by, for instance, extending the RRC UE Capabilitylnformation message with new fields.
  • This capability information 102 may be sent during initial attachment process or on demand by the network device 110 (RRC UE Capability Enquiry) or need for update (e.g., if an antenna on the vehicle bumper is affected by some collision, event- based).
  • the information to be indicated through the MultiantennaCapability field may be the following: number of placed antennas 101, location of antennas 101, frequency dependent characteristics (frequency range, radiation pattern, etc.), gain and vehicle class plus type indication (e.g., truck, van, bus, etc.).
  • the fact that the vehicle 100 supports antenna selection may be indicated by the presence of the MultiantennaCapability field in the UECapabilitylnformation message.
  • context information may be provided from the mobile device 100 (or plurality of mobile devices 100), e.g. located at different vehicles, to the network device 110, in order to support the decision making for the selection of best antenna set, e.g. for specific V2X services.
  • Two different options are considered: a) information provision together with specific service or connection requests for V2V communication among two or a group of mobile devices 100; and b) periodic reporting or event-driven update of context information from the mobile devices 100 to the network device 110.
  • FIG. 5 illustrates exemplary signaling steps for the two options for multi-antenna context information reporting by the mobile device 100 (vehicle).
  • This reporting may be provided to a BS, a Core Network entity or an application server (e.g., cloud server) controlled by a network operator or a third party as the network device 110.
  • a BS a Core Network entity
  • an application server e.g., cloud server
  • a new Multi- antennaContextlnformation field that is used for the static or dynamic selection of a set of antennas (one or more antennas) to be used in a transmission/reception of data from/to the vehicle 100, and includes the following (sub-)elements not excluding additional ones: • Location of transmit and receive vehicles, orientation or relative positions among vehicles 100: position (x, y, z - UTM + altitude), direction of movement, speed, short-term path of vehicle 100.
  • Road environment conditions e.g., surrounding elements such as vehicles, buildings, bridges, etc., the orography of the surrounding terrain
  • Service layer Information type of service, needed transmission modes (e.g., platooning service, multicast, etc.), service duration, periodicity and characteristics of the messages to be sent.
  • Radio/Network conditions Two possible examples: report of total power measured by each antenna or report of Channel Busy Ratio (CBR) measured by each antenna.
  • CBR Channel Busy Ratio
  • the periodic or event-driven reporting of the context information can be configured by the network device 110, either with the RRC Connection Reconfiguration message or with new dedicated messages.
  • the criteria for triggering the context update and the required content could be provided by the network device 110, could be fixed beforehand, or could be fixed by default and modified by the network device 110.
  • Possible criteria for reporting of location could be a change of position by“x” meters, a change of direction of movement“x” degrees or a change of speed“x” m/s.
  • the criterion for reporting of road environment conditions could be e.g. the appearance or disappearance of an obstacle in one communication path of the vehicle 100 (e.g. the path between one antenna and one intended receiver).
  • For periodic reporting elements to report and the periodicity of reports can be configured as in FIG. 6 between the mobile device 100 (vehicle) and the network device 110 (BS).
  • the next step is to notify involved mobile devices 100 (here exemplarily each provided at a vehicle) for selection (or update) of appropriate antenna sets and required configuration for transmission and reception.
  • the network device 110 e.g. here a BS
  • the network device 110 will be in charge of configuring statically or dynamically the antenna selection for vehicle’s transmission/reception.
  • For the initial antenna selection it is proposed to extend the RRC_Connection_Reeonfiguration message to assign certain antenna set for a specific service among group of involved vehicles 100.
  • the transmitting and/or receiving antennas could be selected for each V2X service, for instance, through the field sl-V2X- ConfigDedicatecl, as shown in FIG. 7.
  • the new fields for the sl-V2X-ConfigDedicated element may be:
  • DCI Downlink Control Information
  • SCI Sidelink Control Information
  • a new version of DCI 5A may be used to indicate the transmitting mobile device 100 (vehicle 1), which transmit antenna set to use and, possibly, the antenna set to be used by the receiving mobile device 100 (vehicle 2). Then, the sidelink transmitter uses the SCI with new fields to notify in sidelink to the receivers, which transmit antenna set is used and/or which reception antenna set should be used. This may require a new version of SCI.
  • DCI 5A maximum length is 32 bits. In case the information to be allocated is less than this, a padding with 0s may be applied. Generally, in a conventional transmission, 23 bits are used, meaning that 9 bits are free of use.
  • TXAntennaSelection and RXAntennaSelection sequences signaled in the last RRCConnectionReconfiguration message for the specific sidelink transmission indicated in the DCI old fields. An example of this antenna encoding is shown in FIG. 9.
  • the remaining 9 bits could be alternatively separated e.g. into two parts: First e.g. 1 bit to indicate if there are two simultaneous transmissions. This allows diversity to be applicable in the sidelink transmission. Remaining 8 bits to encode two pairs of group selection (4 bits each).
  • the new version may have the following new fields allocated in 9 bits: use of diversity option (0 without diversity, 1 with diversity) and an indicator of the transmit and receive selection pair with fixed size to 8 bits (if diversity equal to 0) or twice 4 bits (if diversity equal to 1).
  • TX-RX antenna pair options in (like the Modulation and Coding Scheme (MCS) table) and directly signal it in the RRCConnectionReconfiguration or in the DCI the right entry in the table.
  • MCS Modulation and Coding Scheme
  • RRC signaling could be used to identify a subset (of TX-RX antenna pairs for each transmitter and receiver) and DCI a specific value in this subset.
  • the transmitting mobile device 100 Once the transmitting mobile device 100 is informed about the decision of the network device 110 with respect to transmit and receive antennas, for a group of communicating mobile devices 100, it has to inform also the destination mobile device 100 about this antenna selection. This could be made through signaling from the network device 110 to the destination mobile devices 100 or through signaling between the mobile devices 100 (e.g. vehicles) using the network device 110 to signal also to the destination mobile devices about the antenna selection and configuration in reception, or via the extension of already existing indicators. In this latter case, SCI is the appropriate message with the respective extensions. Again, the idea is to use the bits that are currently padded to embed there the required information.
  • the antenna selection could be performed even for cellular downlink (DL) or uplink (UL) communications.
  • the signaling based on DCI would be different.
  • DCIs 1, IX, 2 and 2X should be modified to include antenna group selection fields (see FIG. 10).
  • DCIs 0 and 4 may be modified to include antenna group selection fields (see FIG 11).
  • the scheduling grants contained in DCI Format 5A may be used to allocate resources and can be also used in a multi-antenna configuration when all the antennas use the same set of resources. However, if the goal is to allocate different sets of resources to different sets of antennas, two options are possible:
  • Multiple DCI 5AU could be sent to a mobile device 100 in a subframe, each one with a different set of selected antennas, the mobile device 100 should be capable to receive multiple DCIs simultaneously.
  • DCI 5AU could be extended with the addition of a field with a service indicator.
  • DCI 5AU could have an element (resource-antenna set) per each logical channel identified by the ProSe Per Packet Priority (PPPP) in order of decreasing priority.
  • PPPP ProSe Per Packet Priority
  • the last two capabilities could be further combined to allocate a specific set of resources to a specific set of antennas and a specific service.
  • these could take into account as input information the same context information presented above to make multi antenna configuration decisions, such as the CBR or RSSI measurements. Note that different context information may need different periodicities (e.g. location will not change as quickly as CBR or RSSI).
  • wireless communications between mobile devices 100 is described in more detail.
  • the antenna selection decision could be also made in an autonomous manner by the mobile devices 100 (in the following exemplarily vehicles). In this case, it is up to each vehicle 100 to select the most convenient antenna set for the transmission to any destination vehicle 100 or to a group of vehicles 100. Still, transmission decisions shall be shared with the other vehicles 100 so that they can use the same configuration for the return channel and also prepare themselves for the reception. There are two options with respect to this vehicle-based multi-antenna selection:
  • the vehicles 100 provide context information via the uplink interface to the network device 110 for collection purpose.
  • the network device 110 disseminates context information to the vehicles 100.
  • Multi-antenna selection does not take place at the network-side and consequently is not transferred to the vehicles 100 as in the network-based approach. Instead, vehicles 100 make the decision for antenna selection, based on the context information provided by the network device 110 about neighboring vehicles 100.
  • the decision making for antenna selection is taken by the vehicles 100 (in a distributed and/or cooperative manner) and is communicated to the neighboring vehicles 100.
  • vehicle-based antenna selection with network support is described in more detail. First, collection and dissemination of context information by the network device 110 is described.
  • the“reflector” server shall include a geo server to be able to identify those vehicles 100 that are in the relevance area of every single vehicle 100, to which the information is to be transmitted.
  • the requirements for this purpose are: Knowledge of vehicle’s position, knowledge of vehicles’ IDs whose context information is relevant, generation of a message with aggregated context information from relevant vehicles.
  • a downlink message similar to the Assistance Data message could be used to distribute the context information about other neighboring vehicles 100.
  • a V2X server e.g., the V 1 interface in LTE
  • a V2X control function e.g., the V3 interface in LTE
  • the location of the mobile device is needed to filter relevant information and create the aggregated context information.
  • control plane messages at the radio level or control plane messages from core network functions that are sent via the radio interface) to distribute the aggregated context information from other near vehicles 100.
  • LPP LongTE Positioning Protocol
  • the Assistance Data in LPP could be extended to include in the exchanged information the contextual data from neighbor vehicles.
  • edge computing could be used, by placing the functions for collection of dissemination of context information from the network device, close or at the BS.
  • all vehicles 100 could be in “promiscuous mode” so as to listen the transmission of sidelink data from nearby vehicles 100 and analyze the received signal power. This provides a measure of the coverage map from all the other vehicles. In fact, the analysis of the received signal power from the different antennas could also help locating the other vehicles’ position. In case a vehicle 100 is silent (without being active in any service) it shall send a kind of beacon data periodically so as to allow other to detect its presence and know its coverage map. In the end, the information taken from the analysis of nearby transmission will be added to the contextual Information received from the network.
  • every triple allocation could have a confidence value associated with it, in such a way that if the other pair in the communication makes a different proposal with higher confidence, a vehicle could change its decision and assess the performance of the other alternative. In this sense, every triple decision could increase or decrease its confidence according to the experience transmission. In case of failure of the communication, the confidence on that selection would be reduced and vice versa.
  • mobile device 100 (Vehicle 1) would change its proposal for antenna selection since the other mobile device 100 (Vehicle 2) is giving more confidence to the use of mirror antennas than to the bumpers. This assumes confidence factors given by each vehicle 100 to range e.g. from 0 (lowest confidence) to 9 (highest confidence).
  • notification of antenna selection to involved vehicles 100 is described in more detail.
  • protocols to notify involved vehicles 100 for selection (or update) of appropriate antenna sets and required configuration for transmission and reception are necessary.
  • SCI with the respective extensions can be used to notify to the receivers in sidelink which transmit antenna set is used and/or which reception antenna set should be used for the reception of the information transmitted (see FIG. 12).
  • a new dedicated sidelink control-plane message could be used.
  • vehicle-based antenna selection without network support is described in more detail.
  • vehicles 100 should be able to locally broadcast all their context information and their capabilities.
  • One approach is to use modified CAM-like messages, in such a way that all information described before is included in the header or in the payload of an application layer message.
  • Another proposal is to introduce an RRC-like protocol (control plane) for the radio signaling exchange of contextual information among vehicles.
  • the protocols to notify involved vehicles for selection (or update) of appropriate antenna sets and required configuration for transmission and reception are those already described. If, otherwise, an RRC protocol is considered (e.g.,“light” RRC protocol), it could further simplify the notification phase.
  • RRC protocol e.g.,“light” RRC protocol
  • SRB3 signaling radio bearer 3
  • No new ciphering keys may apply, but simply the same used for the sidelink transmission.
  • the logical channel associated to the SRB3 Once the logical channel associated to the SRB3 have been identified, it will be used to send valid information associated with the context exchange needed for the multi-antenna and resource selection. As in the previous section, the promiscuous mode in vehicles 100 will be used to calculate the received signal power from the nearby vehicles 100, so as to incorporate that information within own contextual data.
  • the context exchange may be carried out using a SidelinkUEtoUEInformation message including context information and a set of multi-antenna configuration alternatives that could then be indexed, e.g. with the SCI available bits (see FIG. 15).
  • the remaining 4 bits could be used to index the configuration to be used in the subsequent transmission. Once a decision is made, it could be exchanged among vehicles so as to make a cooperative decision.
  • FIG. 16 shows a method 1600 according to an embodiment of the present invention.
  • the method 1600 is for wireless communications, and is particularly for a mobile device 100, for instance as shown in FIG. 1.
  • the method 1600 comprises a step 1601 of transmitting capability information 102 to a network device 110 and/or another mobile device 100, the capability information including: an indication 103 regarding the capability of the mobile device 100 to communicate using multiple antennas 101, an antenna characteristic or characteristics of, at least, one of the multiple antennas 101.
  • FIG. 17 shows the method 1700 according to an embodiment of the present invention.
  • the method 1700 is particularly for a network device 110.
  • the method 1700 comprises a step 1701 of receiving capability information 102 from a mobile device 100, the capability information 102 including: an indication 103 regarding a capability of the mobile device 100 to communicate using multiple antennas 101, an antenna characteristic or characteristics of, at least, one of the multiple antennas 101 of the mobile device 100.
  • the method 1700 further comprises a step 1702 of determining an antenna set to be used by the mobile device 100 for communicating with another mobile device 110 based on the received capability information 102.

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

Abstract

La présente invention concerne un dispositif mobile et un dispositif de réseau, respectivement, pour les communications sans fil, en particulier les communications V2X. Le dispositif mobile comprend plusieurs antennes. Le dispositif mobile est configuré pour transmettre des informations de capacité à un dispositif de réseau et/ou à un autre dispositif mobile. Les informations de capacité comprennent une indication concernant la capacité du dispositif mobile à communiquer à l'aide de multiples antennes, et comprennent une caractéristique d'antenne d'au moins une des multiples antennes. Le dispositif de réseau est configuré pour recevoir les informations de capacité en provenance du dispositif mobile, et pour déterminer un ensemble d'antennes à utiliser par le dispositif mobile pour communiquer avec l'autre dispositif mobile sur la base des informations de capacité reçues. Le dispositif de réseau est configuré pour transmettre ensuite des informations concernant l'ensemble d'antennes au dispositif mobile. En variante, des dispositifs mobiles pourraient échanger des informations de capacité et de caractéristique entre eux de façon à réaliser une sélection distribuée concernant le meilleur ensemble d'antennes à utiliser.
EP18723814.2A 2018-05-08 2018-05-08 Dispositif mobile multiantenne et dispositifs de réseau pour communications sans fil Pending EP3782391A1 (fr)

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US11438753B2 (en) * 2018-07-02 2022-09-06 Lg Electronics Inc. Method and apparatus for determining supportable service in wireless communication system
CN113678550A (zh) * 2019-03-29 2021-11-19 诺基亚技术有限公司 降级信令
CN111698662B (zh) * 2020-06-15 2021-10-29 西安电子科技大学 高网络负载场景中mimo系统下的v2x通信方法
DE102021127548A1 (de) 2021-10-22 2023-04-27 Denso Corporation Verteiltes Fahrzeug-Antennensystem für V2X-Kommunikation
WO2024082126A1 (fr) * 2022-10-18 2024-04-25 Qualcomm Incorporated Sélection d'antenne en mode veille

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US9294167B2 (en) * 2012-04-27 2016-03-22 Lg Electronics Inc. Method and apparatus for amplifying multiple input multiple output (MIMO) in wireless communication system
US20140269409A1 (en) * 2013-03-14 2014-09-18 Telefonaktiebolaget L M Ericsson (Publ) Explicit signaling of number of receiver antennas
US9538446B1 (en) * 2015-07-29 2017-01-03 Fortinet, Inc Directed station roaming in cloud managed Wi-Fi network
CN107534982A (zh) * 2015-04-10 2018-01-02 Lg电子株式会社 用于在无线通信系统中考虑优先权来发送/接收d2d信号的方法及设备
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