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    PROVIDING HIGH ASSURANCE OF END-TO-END CPRI CIRCUIT IN A HIGH JITTER PACKET BASED FRONTHAUL NETWORK
    2.
    发明公开
    PROVIDING HIGH ASSURANCE OF END-TO-END CPRI CIRCUIT IN A HIGH JITTER PACKET BASED FRONTHAUL NETWORK 审中-公开

    公开(公告)号：US20230388252A1

    公开(公告)日：2023-11-30

    申请号：US17824077

    申请日：2022-05-25

    Applicant: Cisco Technology, Inc.

    Inventor： Manoj Kumar ,  Somesh Ubhayanandan Malimath ,  Prashant Anand

    IPC: H04L49/90 ,  H04L69/22 ,  H04L69/28 ,  H04L47/34

    CPC classification number: H04L49/90 ,  H04L69/22 ,  H04L69/28 ,  H04L47/34

    Abstract: The present disclosure is directed to ensuring end-to-end packet delivery in a Common Public Radio Interface (CPRI) circuit with a high jitter packet-based fronthaul network. In one aspect, a method includes determining, at a de-mapper, that at least one data packet scheduled to be played out is not available; inserting an idle data packet into a buffer at the de-mapper for each data packet that is not available; continuously monitoring a packet playout process to (1) identify last valid data packet played out, (2) a number of idle data packets inserted, and (3) a number of data packets currently stored in the buffer; and determining that insertion of idle data packets into the buffer should be stopped and a valid data packet to be played out; wherein inserting the idle data packet and the valid data packet ensure link integrity in data packet transmission between two network elements.

    Seamless access to a common physical disk in an AMP system without an external hypervisor
    3.
    发明授权
    Seamless access to a common physical disk in an AMP system without an external hypervisor 有权

    公开(公告)号：US11748180B2

    公开(公告)日：2023-09-05

    申请号：US17860719

    申请日：2022-07-08

    Applicant: Cisco Technology, Inc.

    Inventor： Nivin Lawrence ,  Sandesh K. Rao ,  Manikandan Veerachamy ,  Amit Chandra ,  Tushar Sinha ,  Manoj Kumar ,  David W. Duffey

    IPC: G06F9/54

    CPC classification number: G06F9/544

    Abstract: The present disclosure is directed to seamless access to a common physical disk in an AMP system without an external hypervisor, and includes one or more processors and one or more computer-readable non-transitory storage media comprising instructions that, when executed by the one or more processors, cause one or more components of the system to perform operations including instantiating, by a first instance, a second instance during a system upgrade, creating, in the first instance, a first disk abstraction for a block device of a physical disk, and attaching the block device under the first disk abstraction. The operations further include providing the second instance network-based access to the physical disk using the first disk abstraction of the first instance during the system upgrade.

    LINK ESTABLISHMENT BETWEEN A RADIO EQUIPMENT CONTROLLER (REC) AND RADIO EQUIPMENT (RE) IN A FRONTHAUL NETWORK
    4.
    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
    5.
    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
    6.
    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
    7.
    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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