Link establishment between a radio equipment controller (REC) and radio equipment (RE) in a fronthaul network

Patent metadata

Field	Value
Publication number	US-12323930-B2
Application number	US-202217837439-A
Country	US
Kind code	B2
Filing date	Jun 10, 2022
Priority date	Feb 1, 2019
Publication date	Jun 3, 2025
Grant date	Jun 3, 2025

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.

First claim

What is claimed is:

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.

2. The method of claim 1 , wherein upon achieving the hyper frame number synchronization with the radio equipment controller, the proxy slave does not transmit to the radio equipment controller until the second CPRI bit stream is received from the proxy master.

3. The method of claim 1 , wherein the first CPRI bit-steam stream and the link bit rate are communicated from the proxy slave to the proxy master using an Ethernet network and the second CPRI bit stream is communicated from the proxy master to the proxy slave using the Ethernet network.

4. The method of claim 1 , wherein upon the CPRI Layer 1 link auto-negotiation operations being completed, the proxy slave does not communicate the link bit rate to the proxy master.

5. The method of claim 1 , wherein communicating the link bit rate includes communicating a value indicating a link bit rate option associated with the link bit rate.

6. The method of claim 5 , wherein the value indicating the link bit rate option is included within a header of a Radio over Ethernet (RoE) frame and the first CPRI bit stream is included within a payload of the RoE frame, and wherein the RoE frame is encapsulated within an Ethernet frame.

7. The method of claim 5 , wherein the CPRI Layer 1 link auto-negotiation operations are performed within one transmit time interval of the radio equipment controller.

8. The method of claim 5 , wherein the CPRI Layer 1 link auto-negotiation operations are repeated with the plurality of link bit rates until the radio equipment controller achieves the hyper frame number synchronization for the second CPRI bit stream transmitted by the proxy slave at the particular link bit rate.

9. A system comprising:
a plurality of memory elements for storing data; and
a plurality of processors for executing instructions associated with the data, wherein executing the instructions causes the system to perform operations, 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 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 with 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.

10. The system of claim 9 , wherein upon achieving the hyper frame number synchronization with the radio equipment controller, the proxy slave does not transmit to the radio equipment controller until the second CPRI bit stream is received from the proxy master.

11. The system of claim 9 , wherein the first CPRI bit stream and the link bit rate are communicated from the proxy slave to the proxy master using an Ethernet network and the second CPRI bit stream is communicated from the proxy master to the proxy slave using the Ethernet network.

12. The system of cla

Assignees

• Cisco Tech Inc

Inventors

• Anand Prashant
• Kumar Manoj
• Kayamkulangara Sudhir
• K Dinuraj
• Boopalan Manigandan

Classifications

• H04W84/20

  Leader-follower arrangements · CPC title

• H04W56/001

  Synchronization between nodes · CPC title

• H04W28/22

  Negotiating communication rate · CPC title

• H04W76/10

  Connection setup · CPC title

• H04W56/0005 Primary

  synchronizing of arrival of multiple uplinks · CPC title