Systems, methods and devices for cellular synchronization references

    公开(公告)号:US10652846B2

    公开(公告)日:2020-05-12

    申请号:US15742416

    申请日:2016-03-25

    Abstract: Cellular (e.g., LTE or UMTS) and global navigation satellite system (GNSS) based technologies can provide ubiquitous and seamless synchronization solution for LTE-based vehicle to everything (V2X) or Proximity Services synchronization (ProSe) services. For example, by using joint GNSS timing references and LTE cellular network timing references for V2X or ProSe system synchronization benefits of using GNSS technologies to improve synchronization procedure for LTE based V2X or ProSe services can be enabled, including: (1) accurate and stable timing, (2) availability of a global and stable timing reference and (3) ability to propagate GNSS timing by user equipment having sufficient GNSS signal quality.

    Inter-frequency inter-public land mobile network (PLMN) discovery

    公开(公告)号:US10448235B2

    公开(公告)日:2019-10-15

    申请号:US15557070

    申请日:2015-12-24

    Abstract: A user equipment (UE) can receive, from an eNodeB, a serving PLMN system information block (SIB)19 for a carrier frequency of a serving PLMN of the UE. The UE can acquire inter-frequency and inter-PLMN discovery system information acquisition assistance signaling information from the SIB19. The UE can process a non-serving PLMN SIB19 for one or more carrier frequencies of a non-serving PLMN using the inter-frequency and inter-PLMN discovery system information acquisition assistance signaling information. The UE can identify inter-frequency and inter-PLMN discovery announcement rate information and monitoring control configuration information for the one or more carrier frequencies of the non-serving PLMN to enable the UE to perform device-to-device (D2D) discovery with a UE in the non-serving PLMN according to the inter-frequency and inter-PLMN discovery announcement rate information and monitoring control configuration information.

    APPARATUS OF A USER EQUIPMENT (UE) TO SELECT RESOURCES IN A VEHICLE TO VEHICLE (V2V) COMMUNICATION SYSTEM

    公开(公告)号:US20190150157A1

    公开(公告)日:2019-05-16

    申请号:US16094853

    申请日:2017-05-15

    Abstract: Technology for an apparatus of a user equipment (UE) configured to select spectrum resources in a vehicle to vehicle (V2V) communication system is disclosed. It relies on the established mechanisms for device-todevice, D2D direct mode communication well-known in the context of Proximity Services in a 3GPP LTE communications system. The UE can calculate a received energy in a physical sidelink shared channel (PSSCH) over a sensing period for a portion of one or more sub-channels over selected subframes in a resource pool, by means of measurements of Received Signal Strength Indication, RSSI, of other D2D sidelink channel communications. The UE can identify the one or more sub-channels over the selected subframes that has a measured energy level greater than a threshold value to determine a channel congestion fraction (CCF) comprising a fraction of the resources that exceed the threshold value, reflecting a resource utilization. The UE can send the channel congestion fraction (CCF) to an upper layer of the UE to enable resource reselection for the UE based on the fraction of the resources that exceed the threshold value. The configuration of D2D retransmission parameters is in particular addressed, according to the measured congestion or interference. The UE may as well transmit the measured CCF to a base station evolved node B, eNB, which may accordingly reconfigure the UE's sidelink channel communication transmission parameters.

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