US 12,323,930 B2
Link establishment between a radio equipment controller (REC) and radio equipment (RE) in a fronthaul network
Prashant Anand, Bangalore (IN); Manoj Kumar, Bangalore (IN); Sudhir Kayamkulangara, Bangalore (IN); Dinuraj K, Bangalore (IN); and Manigandan Boopalan, Bangalore (IN)
Assigned to CISCO TECHNOLOGY, INC., San Jose, CA (US)
Filed by Cisco Technology, Inc., San Jose, CA (US)
Filed on Jun. 10, 2022, as Appl. No. 17/837,439.
Application 17/837,439 is a continuation of application No. 16/435,974, filed on Jun. 10, 2019, granted, now 11,395,242.
Claims priority of application No. 201941003988 (IN), filed on Feb. 1, 2019.
Prior Publication US 2022/0303930 A1, Sep. 22, 2022
Int. Cl. H04W 56/00 (2009.01); H04W 28/22 (2009.01); H04W 76/10 (2018.01); H04W 84/20 (2009.01)
CPC H04W 56/0005 (2013.01) [H04W 28/22 (2013.01); H04W 56/001 (2013.01); H04W 76/10 (2018.02); H04W 84/20 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method comprising:
performing, for one or more link bit rates of a plurality of link bit rates configured for a fronthaul network, Common Public Radio Interface (CPRI) Layer 1 link auto-negotiation operations to establish a CPRI link between a radio equipment controller and a radio equipment of the fronthaul network, the CPRI Layer 1 link auto-negotiation operations comprising:
fast-sampling, by a proxy slave, a first CPRI bit stream transmitted by a radio equipment controller to achieve a hyper frame number synchronization with the radio equipment controller at a link bit rate, wherein the fast-sampling comprises attempting to decode the first CPRI bit stream and achieve the hyper frame number synchronization using each of a link bit rate of a plurality of link bit rates configured for a link bit rate fast-sampling set and wherein all of the plurality of link bit rates of the link bit rate fast-sampling set are capable of being utilized within a fast-sampling time period within at least one fast-sampling time interval configured for the proxy slave to attempt to decode the first CPRI bit stream and achieve the hyper frame number synchronization by the proxy slave, the at least one fast-sampling time interval being set to a transmit time interval of the radio equipment controller;
upon the proxy slave achieving the hyper frame number synchronization with the radio equipment controller, communicating the first CPRI bit stream and the link bit rate from the proxy slave to a proxy master;
transmitting, by the proxy master, the first CPRI bit stream to the radio equipment at the link bit rate and the radio equipment attempting to achieve a hyper frame number synchronization with the first CPRI bit stream;
upon the radio equipment achieving the hyper frame number synchronization, the radio equipment communicating a second CPRI bit stream to the proxy master at the link bit rate;
upon the proxy master achieving a hyper frame number synchronization with the radio equipment for the second CPRI bit stream transmitted by the radio equipment at the link bit rate, communicating the second CPRI bit stream from the proxy master to the proxy slave; and
transmitting, by the proxy slave, the second CPRI bit stream to the radio equipment controller, wherein the CPRI Layer 1 link auto-negotiation operations are completed and the CPRI link is established between the radio equipment controller and the radio equipment when the radio equipment controller achieves a hyper frame number synchronization for the second CPRI bit stream transmitted by the proxy slave at a particular link bit rate.