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EP-4740627-A1 - METHOD AND SYSTEM FOR SYNCHRONIZING MULTI-BAND RADIO SYSTEMS 5G NR INTEGRATED MACRO GNB

EP4740627A1EP 4740627 A1EP4740627 A1EP 4740627A1EP-4740627-A1

Abstract

The present disclosure relates to a method and system for synchronizing multi-band radio systems of a 5G NR Integrated Macro gNB with Carrier Aggregation The method includes receiving a primary reference clock signal at least one of a Global Positioning System module and a precision time protocol source; continually monitoring the received primary reference clock signal to determine if the primary reference clock signal is received at least one of the Global Positioning System module and the precision time protocol source; generating a 1 pulse per second output signal and clock based on the determined primary reference clock signal; transmitting the generated 1 pulse per second output signal to a system synchronizer and designating the 1 pulse per second and clock output signal as principal input source for a phase and frequency synchronization of all associated clock outputs.

Inventors

  • GUPTA, DEEPAK
  • BHATNAGAR, PRADEEP KUMAR
  • BHATNAGAR, AAYUSH
  • KHOSYA, NEKIRAM
  • Ghodekar, Anup Prabhakar
  • Bansal, Amrish

Assignees

  • Jio Platforms Limited

Dates

Publication Date
20260513
Application Date
20240614

Claims (20)

  1. 1. A method for synchronizing multi -band radio systems of a 5G NR integrated macro gNB with carrier aggregation, the method comprising: receiving, by a transceiver unit [132], a primary reference clock signal from one of a Global Positioning System (GPS) module and a precision time protocol (PTP) source; continually monitoring, by a monitor unit [134], the received primary reference clock signal to determine if the primary reference clock signal is received from one of the Global Positioning System (GPS) module and the precision time protocol (PTP) source; generating, by a generator unit [136], a 1 pulse per second (PPS) output signal and clock based on the determined primary reference clock signal; and transmitting, by the transceiver unit [132], the generated 1 pulse per second (PPS) output signal to a system synchronizer, and designating the 1 pulse per second (PPS) and clock output signal as a principal input source for a phase and frequency synchronization of all associated clock outputs.
  2. 2. The method as claimed in claim 1 further comprises determining, by a determinator unit [138], a Time of Day (ToD) based on the generated 1PPS output signal and forwarding the ToD from a first network processor (NPl) to a second network processor (NP2) without incurring an additional processing delay.
  3. 3. The method as claimed in claim 1, wherein the primary reference clock signal comprises at least one of GPS National Marine Electronics Association (NMEA) packets and network PTP packets.
  4. 4. The method as claimed in claim 2, wherein the GPS module further comprises an IEEE1588 slave module for processing PTP slave packets to derive the 1PPS signal and the ToD information.
  5. 5. The method as claimed in claim 1, wherein, in absence of the GPS signal and presence of a PTP 1PPS signal, the PTP 1PPS signal is selected as a reference input for the system synchronizer.
  6. 6. The method as claimed in claim 1 , further comprising entering a holdover state by the system synchronizer upon unavailability of both the GPS signal and the PTP 1PPS signal.
  7. 7. The method as claimed in claim 6, wherein the system synchronizer employs an Oven controlled crystal oscillators (OCXO) and Clock oscillators (XO) in a split XO mode to maintain synchronization during the holdover state.
  8. 8. The method as claimed in claim 2, wherein the second network processor (NP2) acts as a PTP grandmaster, utilizing the forwarded ToD for an embedding time and a phase information into PTP packets.
  9. 9. The method as claimed in claim 8, wherein the NP2 employs the ToD and the 1PPS input to incorporate the time and phase information into the PTP packets relayed via a fronthaul interface, and connected to a radio unit of a 700 MHz band.
  10. 10. The method as claimed in claim 2, wherein configuration and control of the system synchronizer are executed by the NP 1 to ensure a consistent time and phase synchronization across the multi-band radio systems.
  11. 11. A system for synchronizing multi-band radio systems of a 5G NR integrated macro gNB with a carrier aggregation, the system comprises: a transceiver unit [132], configured to receive a primary reference clock signal from at least one of a Global Positioning System GPS module and a precision time protocol (PTP) source; a monitor unit [134], configured to continually monitor the received primary reference clock signal to determine if the primary reference clock signal is received at least one of the Global Positioning System (GPS) module and the precision time protocol (PTP) source; a generator unit [136], configured to generate a 1PPS output signal and clock based on the determined primary reference clock signal; and the transceiver unit [132], configured to generate the generated 1 pulse per second (PPS) output signal to a system synchronizer, and designating the 1 pulse per second (PPS) and clock output signal as a principal input source for phase and frequency synchronization of all associated clock outputs.
  12. 12. The system as claimed in claim 11, further comprising a determinator unit [138] configured to determine a Time of Day (ToD) based on the generated 1PPS output signal and forwarding the ToD from a first network processor (NPl) to a second network processor (NP2) without incurring additional processing delay.
  13. 13. The system as claimed in claim 11, wherein the primary reference clock signal comprises at least one of GPS National Marine Electronics Association (NMEA) packets and network PTP packets.
  14. 14. The system as claimed in claim 12, wherein the GPS module further comprises an IEEE1588 slave module for processing PTP slave packets to derive the 1PPS signal and the ToD information.
  15. 15. The system as claimed in claim 11, wherein, in absence of the GPS signal and a presence of the PTP 1PPS signal, the PTP 1PPS signal is selected as the reference input for the system synchronizer.
  16. 16. The system as claimed in claim 11, wherein the system synchronizer enters in a holdover state upon unavailability of both the GPS signal and the PTP 1PPS signal.
  17. 17. The system as claimed in claim 16, wherein the system synchronizer employs an Oven controlled crystal oscillators (OCXO) and Clock oscillators (XO) in a split XO mode to maintain the synchronization during the holdover state.
  18. 18. The system as claimed in claim 12, wherein the second network processor (NP2) acts as a PTP grandmaster, utilizing the forwarded ToD for an embedding time and phase information into the PTP packets.
  19. 19. The system as claimed in claim 18, wherein the NP2 employs the ToD and the 1PPS input to incorporate the time and phase information into the PTP packets relayed via a fronthaul interface and connected to a radio unit of a 700 MHz band.
  20. 20. The system as claimed in claim 12, wherein configuration and control of the system synchronizer are executed by the NP1 to ensure a consistent time and the phase synchronization across the multi -band radio systems.

Description

METHOD AND SYSTEM FOR SYNCHRONIZING MULTI BAND RADIO SYSTEMS 5G NR INTEGRATED MACRO GNB FIELD OF THE INVENTION [001] Embodiments of the present disclosure relate generally to the field of wireless communication systems. More particularly, embodiment of the present disclosure relates to a method and system for synchronizing multi -band radio systems of a 5G NR Integrated Macro gNB with Carrier Aggregation. BACKGROUND [002] The following description of related art is intended to provide background information pertaining to the field of the disclosure. This section may include certain aspects of the art that may be related to various features of the present disclosure. However, it should be appreciated that this section be used only to enhance the understanding of the reader with respect to the present disclosure, and not as admissions of prior art. [003] Wireless communication technology has rapidly evolved over the past few decades, with each generation bringing significant improvements and advancements. The first generation of wireless communication technology was based on analog technology and offered only voice services. However, with the advent of the second-generation (2G) technology, digital communication and data services became possible, and text messaging was introduced. The third- generation (3G) technology marked the introduction of high-speed internet access, mobile video calling, and location-based services. The fourth-generation (4G) technology revolutionized wireless communication with faster data speeds, better network coverage, and improved security. Currently, the fifth-generation (5G) technology is being deployed, promising even faster data speeds, low latency, and the ability to connect multiple devices simultaneously. With each generation, wireless communication technology has become more advanced, sophisticated, and capable of delivering more services to its users. [004] Synchronization is the most important and critical process in the telecom system to ensure high level of accuracy in the end-to-end communication. In 5G, latency requirements are very stringent (less than 5ms) which generates requirement for a very precise and highly reliable clock and synchronization system implementation. [005] To meet the target latency of 5G system, telecom operators are required to implement a stable clock and timing system in their network. This is implemented while utilizing secondary synchronization cards in the radios and primary synchronization card in the Centralized Unit (CU). There exists a need for meeting the timing and phase requirement of a multi-band (low band and mid band) radio system while implementing network synchronization and meeting holdover requirements. OBJECTS OF THE INVENTION [006] Some of the objects of the present disclosure, which at least one embodiment disclosed herein satisfies are listed herein below. [007] One primary object of the disclosure is to provide a unique system synchronization method, that may synchronize multi -band radio systems. [008] The disclosure also aims to disclose a unique circuit and method, that is meeting the timing and phase requirement of a multi-band (low band and mid band) radio system while implementing network synchronization and meeting holdover requirements. [009] Another object of the present disclosure is integrated macro gNodeB with Carrier Aggregation solution that brings together integrated CU, DU and RU functionality for Band n78 and CU, DU and High PHY functionality for Band n28 thus supporting Carrier Aggregation (CA). [0010] Further, an integrated Macro gNodeB with CA solutions bring together integrated functionality of TDD band n78 complete PHY and High PHY functionality of FDD band n28 on a single hardware. Hence, another object is to implement a unique clock circuit where time, phase and frequency synchronization is happening in the radio unit itself on the top of the tower/ base station. [0011] Yet another object of the present disclosure is that 5G NR Integrated Macro gNodeB with CA for 700 MHz design have an integrated solution with cavity fdter without any use of cable. SUMMARY OF THE DISCLOSURE [0012] This section is provided to introduce certain aspects of the present disclosure in a simplified form that are further described below in the detailed description. This summary is not intended to identify the key features or the scope of the claimed subject matter. [0013] According to an aspect of the present disclosure relates to a system for synchronizing multiband radio systems of a 5G NR Integrated Macro gNB with Carrier Aggregation is disclosed. The system comprises a transceiver unit, configured to receive a primary reference clock signal from at least one of a Global Positioning System GPS module or a precision time protocol (PTP) source. The system further comprises a monitor unit connected to the transceiver unit, wherein the monitor unit is configured to continually monitor the received primary reference clo