Cloud based wireless network

• US 10,064,149 B1
• Filed: 05/03/2016
• Issued: 08/28/2018
• Est. Priority Date: 05/17/2015
• Status: Active Grant

• Current Assignee: Kiomars Anvari
• Original Assignee: Kiomars Anvari
• Inventors: Anvari, Kiomars
• Primary Examiner(s): Renner, Brandon M
• Assistant Examiner(s): Vogel, Jay L
• Application Number:
  US15/145,536
• Time in Patent Office: 847 Days
• CPC Class Codes: H04L 67/10 in which an application is distributed across nodes in the network software deployment G06F8/60; multiprogramming arrangements G06F9/46
• CPC Class Codes: H04W 56/0015 one node acting as a reference for the others

Abstract

A synchronization technique for cloud radio access network (cloud RAN) to synchronize the cloud and remote radio units. The connection between cloud and remote radios is Ethernet and IEEE1588 is used to provide synchronization between baseband residing in the cloud and remote radios.

Claims

1. A cloud radio access network (CRAN) system comprising:

a cloud with a baseband unit to perform detection of an information data from a received baseband signal from a remote radio unit (RRU), carry out information data modulation to provide a transmit baseband signal for transmission to the RRU, and maintain the cloud network synchronization and time of the day using a cloud IEEE1588 (Institute of Electrical and Electronics Engineering

     1588) timing;

said RRU consists of a baseband unit to perform baseband signal conditioning supporting at least one of baseband signal frames or packets formatting, amplitude gain control (AGC), crest factor reduction (CFR), digital pre-distortion (DPD), equalization and beam forming, and a RRU IEEE1588 timing to maintain clock synchronization with said baseband unit in the cloud and time of the day;

an asynchronous link between said RRU and said baseband unit in the cloud using an Ethernet packet protocol to carry at least one of an information signal, a control signal and a synchronization signal;

said information signal contains at least one of a CPRI (common protocol for radio interface) baseband sample frame, an OBSAI (open base station architecture initiative) baseband sample frame, and a proprietary baseband frame or packet;

said RRU IEEE1588 uses said asynchronous link to pair with at least one of said cloud IEEE1588, and an independent IEEE1588 node within the communication network infrastructure to provide clock synchronization and time of the day for RRU;

Said baseband unit in the RRU and said baseband unit in the cloud use the time of the day to assign a time stamp to at least one of said CPRI baseband sample frame, said OBSAI baseband sample frame and said proprietary baseband frame or packet that is sent to said baseband unit in the cloud and said baseband unit in the RRU respectively;

Said time stamp assigned by said baseband unit in the cloud is used by said baseband unit in the RRU to store based on the order of transmitted time stamp of at least one of said CPRI baseband sample frame, said OBSAI baseband sample frame and said proprietary baseband frame or packet and then format for transmission over the air;

Said time stamp assigned by said baseband unit in the RRU is used by said baseband unit in the cloud to store based on the order of transmitted time stamp of at least one of said CPRI baseband sample frame, said OBSAI baseband sample frame and said proprietary baseband frame or packet and then format for detection by said information data detector.

2. The cloud radio access network (CRAN) system of claim 1, wherein the RRU IEEE1588 timing uses timing information to create synchronized clocks and reference frequencies for the remote radio unit.

3. The cloud radio access network (CRAN) system of claim 1, wherein said asynchronous link between said RRU and said cloud uses header compression.

4. The cloud radio access network (CRAN) system of claim 1, wherein, the memory size of the RRU baseband unit and the cloud baseband unit exceeds a maximum delay jitter of the transmit baseband signal received from the cloud and the received baseband signal from the RRU.

5. The cloud radio access network (CRAN) system of claim 1, wherein said CPRI baseband sample frame, said OBSAI baseband sample frame, and said proprietary baseband frame or packet have a RRU identification number or code.