US 12,219,512 B2
Small cell demodulation reference signal and initial synchronization
Hua Xu, Ottawa (CA); Shiwei Gao, Nepean (CA); Yajun Zhu, Beijing (CN); Zhijun Cai, Ashburn, VA (US); Chandra Sekhar Bontu, Nepean (CA); and Yi Song, Plano, TX (US)
Assigned to Malikie Innovations Limited, Dublin (IE)
Filed by MALIKIE INNOVATIONS LIMITED, Dublin (IE)
Filed on Oct. 23, 2023, as Appl. No. 18/492,667.
Application 18/492,667 is a continuation of application No. 17/838,828, filed on Jun. 13, 2022, granted, now 11,832,201.
Application 17/838,828 is a continuation of application No. 16/903,083, filed on Jun. 16, 2020, granted, now 11,395,248, issued on Jul. 19, 2022.
Application 16/903,083 is a continuation of application No. 15/988,886, filed on May 24, 2018, granted, now 10,694,481, issued on Jun. 23, 2020.
Application 15/988,886 is a continuation of application No. 15/376,046, filed on Dec. 12, 2016, granted, now 9,986,524, issued on May 29, 2018.
Application 15/376,046 is a continuation of application No. 13/767,682, filed on Feb. 14, 2013, granted, now 9,521,637, issued on Dec. 13, 2016.
Prior Publication US 2024/0056998 A1, Feb. 15, 2024
Int. Cl. H04W 56/00 (2009.01); H04W 72/0446 (2023.01); H04W 88/02 (2009.01); H04W 88/08 (2009.01)
CPC H04W 56/0015 (2013.01) [H04W 72/0446 (2013.01); H04W 88/02 (2013.01); H04W 88/08 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A system comprising a first network element and a second network element, the first network element comprising a processor configured to: synchronize with the second network element; and maintain synchronization with the second network element; wherein the first network element is a small cell enhanced node-B (eNB), and the second network element is one of a macro cell eNB or a small cell eNB, wherein the first network element and the second network element both communicate on a same frequency band; and wherein the processor of the first network element is configured to: transmit only on a first portion in time of a Multimedia Broadcast multicast service Single Frequency Network (MBSFN) subframe and listen to a downlink subframe from the second network element on a remaining second portion in time of the MBSFN subframe to maintain synchronization, wherein the second network element is a macro cell eNB, and when the first network element is unable to synchronize with the second network element, the processor of the first network element is configured to synchronize with a neighbouring small cell eNB, different from the small cell eNB, and wherein the neighbouring small cell eNB is unable to synchronize with the second network element and is configured as a timing reference to broadcast a sync rank status to indicate a timing accuracy of the neighboring small cell eNB.