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    Re-timing a packetized radio flow to clean noise induced by packet delay variation of a packet network
    4.
    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：US11095384B2

    公开(公告)日：2021-08-17

    申请号：US16751509

    申请日：2020-01-24

    Applicant: Cisco Technology, Inc.

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

    IPC: H04L29/06 ,  H04J3/06

    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.

    Time synchronization in passive optical networks
    6.
    发明授权
    Time synchronization in passive optical networks 有权

    公开(公告)号：US11843453B2

    公开(公告)日：2023-12-12

    申请号：US17224532

    申请日：2021-04-07

    Applicant: CISCO TECHNOLOGY, INC.

    Inventor： Prashant Anand ,  Ashok Chandre Gowda ,  Ajay Sandhir

    IPC: H04J3/06 ,  H04Q11/00

    CPC classification number: H04J3/0667 ,  H04J3/0644 ,  H04Q11/0067 ,  H04Q2213/1336 ,  H04Q2213/13361

    Abstract: This technology allows time synchronization in passive optical networks (“PON”). A first Ethernet device timestamps and transmits a packet to a second Ethernet device via the PON. The first Ethernet device transmits the packet to a small form-factor pluggable (“SFP”) device within the PON and connected to the first Ethernet device. The SFP device determines a transmission time to a second SFP device and modifies a correction field (“CF”) of the packet by subtracting an ingress time and the transmission time from the CF. The packet is transmitted to the second SFP device, which modifies the CF by the addition of an egress time. The modified CF value represents the real-time transmission delay incurred in the SFP devices. The packet is transmitted to a second Ethernet device to synchronize a clock using the timestamp and the CF value in accordance with the PTP/IEEE-1588 standard.

    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：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
    8.
    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.

    Network incident identification based on characterizing relationships between interfaces and events as graphical component relationships
    9.
    发明授权
    Network incident identification based on characterizing relationships between interfaces and events as graphical component relationships 有权

    公开(公告)号：US10756951B2

    公开(公告)日：2020-08-25

    申请号：US15662112

    申请日：2017-07-27

    Applicant: Cisco Technology, Inc.

    Inventor： Parthibhan Paramaguru ,  Prashant Anand ,  Vasudevan Visvanathan ,  Sundar Ramakrishnan ,  Dharmarajan Subramanian ,  Rohit Kumar Gupta ,  Abhishek Chaudhary

    IPC: H04L12/24

    Abstract: Techniques for use in network incident identification are described. In response to an occurrence of an unknown network incident, a plurality of log messages (e.g. syslog messages) are received from a plurality of network components in one or more networks. In one illustrative example, a plurality of relationships between interfaces and events are derived from the received log messages and characterized as a plurality of graphical component relationships. One or more groups of connected components are determined from the graphical component relationships and network component connection data which indicate interface relationships of the network components. Here, groups of connected components may be logically joined based on the network component connection data indicating one or more interface relationships. A network incident may then be identified based on at least one of the determined groups of connected components being associated with at least one identified set of events that has the closest or substantial match with at least one predetermined set of events associated with the network incident.

    PROVIDING HIGH ASSURANCE OF END-TO-END CPRI CIRCUIT IN A HIGH JITTER PACKET BASED FRONTHAUL NETWORK
    10.
    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.

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