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公开(公告)号：US20230208520A1
公开(公告)日：2023-06-29
申请号：US17927166
申请日：2021-06-07
申请人： SIGNIFY HOLDING B.V.
IPC分类号： H04B10/114 , H04B10/116
CPC分类号： H04B10/1143 , H04B10/116
摘要： An optical wireless communications, OWC, network (100) comprises a plurality of access points (120) for communicating with a plurality of endpoint devices (110) via modulated light. A control system (13) receives a report indicating a timeslot during which a first one of the access points (120a) detected an event indicative of interference and transmits an indication of the timeslot to at least one other access point (120b). The other access point (120b) provides to the control system (13) identifiers of any registered endpoint devices which used or are using that timeslot. If the control system (13) receives an identifier of a single endpoint device from the other access point (120b), it determines that endpoint device as a cause of the interference experienced at the first access point (120a). If the control system (13) receives identifiers of plural endpoint devices from other access points (120), it causes endpoint devices in the OWC network (100) to advertise their presence.
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公开(公告)号：US20230111629A1
公开(公告)日：2023-04-13
申请号：US17908320
申请日：2021-03-01
申请人： SIGNIFY HOLDING B.V.
IPC分类号： H04W36/08 , H04B10/112 , H04W36/00 , H04W12/037 , H04W12/06 , H04W12/041
摘要： Because of the line-of-sight character of optical wireless communication and a limited field-of-view of optical receivers, the coverage of an access point and the overlapping coverage area of adjacent access points in an optical system are smaller as compared to a RF system. It turns more challenging to support an end point (110) to roam securely in an optical multi-cell wireless communication network. To speed up the derivation of a new pairwise transient key with a new access point during a handover procedure, the end point of this invention comprises a controller (118) that is configured to act as a second supplicant (1181), on behalf of a first supplicant (1186) comprised in a host processor (1185), to communicate with an authenticator to establish a new pairwise transient key for the end point (110) and a candidate access point, and an active pairwise transient key with the currently associated access point is used to secure the communication for new key derivation.
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公开(公告)号：US20220360329A1
公开(公告)日：2022-11-10
申请号：US17641621
申请日：2020-08-28
申请人： SIGNIFY HOLDING B.V.
IPC分类号： H04B10/116 , H04L67/06
摘要： Given the potential high data rate and privacy of Optical Wireless Communication, Li-Fi turns out to be an attractive technology for enabling high-speed wireless data transfer between remote devices. This invention is directed to various methods, systems and apparatus for enabling high-speed file transfer via a high-speed Li-Fi link (200) between a user-held apparatus (300) and a remote device (400). Upon a trigger command received by the user-held apparatus (300), a trigger signal is sent to the remote device (400) via another communication link (500) having a wide beam width. The remote device (400) provides a human perceivable indication of a dedicated reception area after receiving the trigger signal to assist a user to adjust the user-held apparatus (300) for an alignment needed to enable the high-speed Li-Fi link (200). The high-speed file transfer starts after the alignment status is determined allow for file transfer, or a start-to-send command is received by the user-held apparatus (300).
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公开(公告)号：US20220321217A1
公开(公告)日：2022-10-06
申请号：US17633706
申请日：2020-07-20
申请人： SIGNIFY HOLDING B.V.
IPC分类号： H04B10/114 , H04B10/116
摘要： For time-division based wireless optical networks, it is important to keep neighboring coordinators synchronized to a common time base, in order to avoid interference to a network device located in the overlapping area of such neighboring coordinators. However, given that the common time base is located remotely, there is still timing synchronization uncertainty remaining at a coordinator side. A novel auxiliary scheduler subsystem, and the related methods and systems, are disclosed in this invention. By reserving time margins in the allocated time slots by the auxiliary scheduler subsystem, interference due to timing synchronization uncertainty is reduced.
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公开(公告)号：US20220256406A1
公开(公告)日：2022-08-11
申请号：US17628590
申请日：2020-07-20
申请人： SIGNIFY HOLDING B.V.
IPC分类号： H04W36/00 , H04B10/116 , H04B10/114 , H04B10/077
摘要： According to one aspect disclosed herein, there is provided a system (500) comprising at least two light cells (504, 508) connected to form a light communication network. The system comprises at least two light cells each formed by a respective first beam of light comprising a respective data signal and a second beam of light comprising a pilot signal. Each data signal has an amplitude profile with a portion above a pre-determined threshold level (316), and said portion of the respective data signals of the at least two light cells partially overlap to form an overlapping region (306) with an amplitude profile (720, 730) above the predetermined threshold level. Each pilot signal in turn has an amplitude profile (740, 750) which comprises an ascending edge and a descending edge and a footprint which is aligned with a footprint of the respective data signal for use in performing a pre-handover and/or handover.
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公开(公告)号：US20210119743A1
公开(公告)日：2021-04-22
申请号：US16981881
申请日：2019-03-05
申请人： SIGNIFY HOLDING B.V.
IPC分类号： H04L5/00 , H04W72/12 , H04W72/08 , H04B10/112
摘要： In a LiFi network with multiple coordinators, interference in the overlapping areas between the local parts of the network can occur if each coordinator determines its own local time schedule for communicating with devices. To solve this problem, the invention proposes cooperation between the coordinators to determine non-interfering local time schedules whereby the coordinators rely on interference reports from the devices in the overlapping areas and apply a small number of simple rules. The proposed method is simple, scalable and independent from a central unit.
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公开(公告)号：US20240072893A1
公开(公告)日：2024-02-29
申请号：US17766694
申请日：2020-10-05
申请人： SIGNIFY HOLDING B.V.
发明人： Andries VAN WAGENINGEN , Michel GERME , Johan-Paul Marie Gerard LINNARTZ , Paul Henricus Johannes Maria VOORTHUISEN , Matthias WENDT
IPC分类号： H04B10/114
CPC分类号： H04B10/114
摘要： According to one aspect disclosed herein, there is provided a client device for use in an optical wireless communications network, the client device comprising a transceiver configured to receive data via an optical wireless connection. The transceiver comprises an upward facing optical transducer configured to detect or transmit an optical wireless transmission, the sensor arranged to have a coverage area with at least two 5 concentric segments. A portion of the sensor is configured to provide an outermost segment of the at least two concentric segments.
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公开(公告)号：US20230337068A1
公开(公告)日：2023-10-19
申请号：US17796664
申请日：2021-02-15
申请人： SIGNIFY HOLDING B.V.
CPC分类号： H04W36/0038 , H04W12/04 , H04W36/00835
摘要： Because of the line-of-sight character of optical wireless communication and a limited field-of-view of optical receivers, the coverage of an access point (120) and the overlapping coverage area of adjacent access points (120) in an optical system are smaller as compared to a RF system. It turns more challenging to support an end point (110) to roam securely in an optical multi-cell wireless communication network (100). To address that problem, a subsystem is disclosed to select for the end point (110) a candidate access point out of the plurality of access points (120) in view of one or more neighbor relationships, and to inform the end point (110) about the candidate access point to trigger the end point (110) to start a procedure for pre-establishing a new pairwise transient key between the end point (110) and the candidate access point (120) for a secure handover.
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9.发明公开公开(公告)号：US20230308176A1
公开(公告)日：2023-09-28
申请号：US18020129
申请日：2021-08-05
IPC分类号： H04B10/079 , H04B10/116
CPC分类号： H04B10/07953 , H04B10/116
摘要： This invention proposes a mechanism to improve system performance in an optical wireless communication system by examining whether time slots in time channels are to be scheduled for exclusive use or could be utilized for parallel communication. The examination is based on a cross-over point from tolerating interference to applying time division. A reserved period for each access point is defined within its assigned time channel, which is exclusively reserved for communication with its endpoint(s). This reduces the communication overhead and keeps freedom of adapting slot-scheduling in the exclusive period at the cost of some performance reduction. To minimize this performance reduction, the size of the reserved period can be adapted to the actual need based on the traffic demand for exclusive use and non-exclusive use.
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公开(公告)号：US20240056183A1
公开(公告)日：2024-02-15
申请号：US17766665
申请日：2020-09-29
申请人： SIGNIFY HOLDING B.V.
IPC分类号： H04B10/112 , H04J14/08
CPC分类号： H04B10/112 , H04J14/08
摘要： In an optical wireless communication, OWC, network (100), time division multiple access, TDMA, is commonly used for interference suppression among multiple network devices (D1-Dn) associated to a single coordinator, or among adjacent coordinators (C1-Cn). However, an offset of MAC cycles among two adjacent coordinators (C1-C2) may still result in interference to a network device (D1) located in the overlapping area of the coverage areas of these two adjacent coordinators (C1-Cn). This invention is directed to various methods, apparatus, systems, computer program and computer-readable media for providing a mechanism to make use of an out-of-band channel to send a signal from a network device (D1) to the two adjacent coordinators (C1-C2), for assisting the alignment of MAC cycles among the two adjacent coordinators (C1-C2), and the out-of-band channel has a line-of-sight character, and is out-of-band as compared to the OWC network (100).
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