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    LINK ESTABLISHMENT BETWEEN A RADIO EQUIPMENT CONTROLLER (REC) AND RADIO EQUIPMENT (RE) IN A FRONTHAUL NETWORK
    2.
    发明申请
    LINK ESTABLISHMENT BETWEEN A RADIO EQUIPMENT CONTROLLER (REC) AND RADIO EQUIPMENT (RE) IN A FRONTHAUL NETWORK 有权

    公开(公告)号：US20220377692A1

    公开(公告)日：2022-11-24

    申请号：US17881043

    申请日：2022-08-04

    Applicant: Cisco Technology, Inc.

    Inventor： Prashant Anand ,  Manoj Kumar ,  Sudhir Kayamkulangara ,  Dinuraj K ,  Manigandan Boopalan

    IPC: H04W56/00 ,  H04W76/10 ,  H04W28/22

    Abstract: Techniques that provide link establishment between a radio equipment controller (REC) and a radio equipment (RE) in a fronthaul network are described herein. In one embodiment, a method includes performing, Common Public Radio Interface (CPRI) Layer 1 (L1) link auto-negotiation operations to establish a CPRI link between the REC and RE. A proxy slave may achieve a hyper frame number (HFN) synchronization with the REC at a link bit rate for a first CPRI bit stream and communicate the first CPRI bit stream and the link bit rate to a proxy master. The proxy master may communicate a second CPRI bit stream to the proxy slave to transmit to the REC. The L1 link auto-negotiation operations are completed and CPRI link is established between the REC and the RE when the REC achieves a HFN synchronization for the second CPRI bit stream.

    Link fault handling in fronthaul communication networks
    3.
    发明授权
    Link fault handling in fronthaul communication networks 有权

    公开(公告)号：US11206557B2

    公开(公告)日：2021-12-21

    申请号：US16543344

    申请日：2019-08-16

    Applicant: Cisco Technology, Inc.

    Inventor： Prashant Anand ,  Manoj Kumar ,  Sudhir Kayamkulangara ,  Manigandan Boopalan ,  Dinuraj K

    IPC: H04L12/24 ,  H04W24/04 ,  H04W84/20

    Abstract: In a fronthaul network system, when a CPRI link fault is detected at either of the REC or RE, both the REC and RE perform a Layer 1 synchronization. The fault may be a loss of signal, loss of frame, or a line code violation, which also translates to a loss of signal if seen beyond a threshold. A proxy slave recognizes the fault in a CPRI signal from a first radio device and inserts the fault alarm into a header of a radio over Ethernet frame. The proxy slave continues to communicate the signal for a configured number of hyper-frames. A proxy master receives the signal and communicates the signal and the fault alarm to a receiving radio device for a configured number of hyper-frames. The proxy and radio devices all perform a joint resynchronization.

    Rack-mountable heat-exchanger for modular electronic systems
    6.
    发明授权
    Rack-mountable heat-exchanger for modular electronic systems 有权

    公开(公告)号：US11812585B2

    公开(公告)日：2023-11-07

    申请号：US17445470

    申请日：2021-08-19

    Applicant: Cisco Technology, Inc.

    Inventor： Rohit Dev Gupta ,  Manigandan Boopalan ,  Arjun G. Jayaprakash ,  Parag Ghate

    IPC: H05K7/20

    CPC classification number: H05K7/20736 ,  H05K7/20145 ,  H05K7/20836

    Abstract: A rack-mountable heat-exchanger for modular electronic systems is provided that include a heat exchanger including ambient air inlets and outlets forming an ambient airflow path in a first direction, and recirculating air inlets and outlets forming a recirculating airflow path in a second direction perpendicular to the first direction separated from the ambient airflow path; housing for an electronic device, the housing including internal air inlets and outlets forming an internal airflow path; a first duct configured to link the recirculating air outlet to the internal air inlet; a second duct configured to link the recirculating air inlet to the internal air outlet; and fan assemblies located one of the airflow path, configured to propel air through the heat exchanger in the respective airflow path.

    LINK ESTABLISHMENT BETWEEN A RADIO EQUIPMENT CONTROLLER (REC) AND RADIO EQUIPMENT (RE) IN A FRONTHAUL NETWORK
    7.
    发明申请
    LINK ESTABLISHMENT BETWEEN A RADIO EQUIPMENT CONTROLLER (REC) AND RADIO EQUIPMENT (RE) IN A FRONTHAUL NETWORK 有权

    公开(公告)号：US20220303930A1

    公开(公告)日：2022-09-22

    申请号：US17837439

    申请日：2022-06-10

    Applicant: Cisco Technology, Inc.

    Inventor： Prashant Anand ,  Manoj Kumar ,  Sudhir Kayamkulangara ,  Dinuraj K ,  Manigandan Boopalan

    IPC: H04W56/00 ,  H04W76/10 ,  H04W28/22

    Abstract: Techniques associated with link establishment in a fronthaul network are described herein. In one embodiment, a method includes receiving, by a proxy node, a Common Public Radio Interface (CPRI) bit stream transmitted by a radio equipment controller, wherein the CPRI bit stream is transmitted within a transmit time interval of the radio equipment controller; and fast-sampling, by the proxy node, the CPRI bit stream to determine whether a hyper frame number synchronization with the radio equipment controller at a common matching link bit rate is achievable, wherein the fast-sampling comprises attempting to decode the received CPRI bit stream and achieve the hyper frame number synchronization for each of a plurality of link bit rates configured for a fast-sampling time period during at least one fast-sampling time interval configured for the proxy node.

    LINK FAULT HANDLING IN FRONTHAUL COMMUNICATION NETWORKS
    8.
    发明申请
    LINK FAULT HANDLING IN FRONTHAUL COMMUNICATION NETWORKS 有权

    公开(公告)号：US20220078642A1

    公开(公告)日：2022-03-10

    申请号：US17527642

    申请日：2021-11-16

    Applicant: Cisco Technology, Inc.

    Inventor： Prashant Anand ,  Manoj Kumar ,  Sudhir Kayamkulangara ,  Manigandan Boopalan ,  Dinuraj K

    IPC: H04W24/04 ,  H04L12/24

    Abstract: In a fronthaul network system, when a CPRI link fault is detected at either of the REC or RE, both the REC and RE perform a Layer 1 synchronization. The fault may be a loss of signal, loss of frame, or a line code violation, which also translates to a loss of signal if seen beyond a threshold. A proxy slave recognizes the fault in a CPRI signal from a first radio device and inserts the fault alarm into a header of a radio over Ethernet frame. The proxy slave continues to communicate the signal for a configured number of hyper-frames. A proxy master receives the signal and communicates the signal and the fault alarm to a receiving radio device for a configured number of hyper-frames. The proxy and radio devices all perform a joint resynchronization.

    LINK ESTABLISHMENT BETWEEN A RADIO EQUIPMENT CONTROLLER (REC) AND RADIO EQUIPMENT (RE) IN A FRONTHAUL NETWORK
    9.
    发明申请
    LINK ESTABLISHMENT BETWEEN A RADIO EQUIPMENT CONTROLLER (REC) AND RADIO EQUIPMENT (RE) IN A FRONTHAUL NETWORK 审中-公开

    公开(公告)号：US20200252980A1

    公开(公告)日：2020-08-06

    申请号：US16435961

    申请日：2019-06-10

    Applicant: Cisco Technology, Inc.

    Inventor： Prashant Anand ,  Manoj Kumar ,  Sudhir Kayamkulangara ,  Dinuraj K ,  Manigandan Boopalan

    IPC: H04W76/10 ,  H04W56/00 ,  H04W28/22

    Abstract: Techniques that provide link establishment between a radio equipment controller (REC) and a radio equipment (RE) in a fronthaul network are described herein. In one embodiment, a method includes performing, Common Public Radio Interface (CPRI) Layer 1 (L1) link auto-negotiation operations to establish a CPRI link between the REC and RE. A proxy slave may achieve a hyper frame number (HFN) synchronization with the REC at a link bit rate for a first CPRI bit stream and communicate the first CPRI bit stream and the link bit rate to a proxy master. The proxy master may communicate a second CPRI bit stream to the proxy slave to transmit to the REC. The L1 link auto-negotiation operations are completed and CPRI link is established between the REC and the RE when the REC achieves a HFN synchronization for the second CPRI bit stream.

    Re-timing a packetized radio flow to clean noise induced by packet delay variation of a packet network
    10.
    发明授权
    Re-timing a packetized radio flow to clean noise induced by packet delay variation of a packet network 有权

    公开(公告)号：US10594423B1

    公开(公告)日：2020-03-17

    申请号：US16564493

    申请日：2019-09-09

    Applicant: Cisco Technology, Inc.

    Inventor： Prashant Anand ,  Sudhir Kayamkulangara ,  Dinuraj K ,  Manigandan Boopalan ,  Manoj Kumar

    IPC: H04J3/06 ,  H04L29/06

    Abstract: Techniques are described to provide for re-timing a packetized radio flow to clean noise induced by packet delay variation of a packet network. In one example, a method includes receiving, at a first node of a fronthaul network, a Radio over Ethernet (RoE) frame transmitted by a second node in which the RoE frame comprises a Common Public Radio Interface (CPRI) bit stream associated with a first radio device, a sequence number, and a first time stamp. The method may further include generating a second time stamp by the first node upon obtaining the RoE frame; calculating an induced delay value based, at least in part, on the first time stamp and the second time stamp; calculating a re-timing value based on a re-timing interval and the induced delay value; and transmitting the CPRI bit stream to a second radio device based on the re-timing value.

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