Patent No. EP3324678 (titled "Cell Reselection Based On Difference Between Current Cell Reselection Time And Cell Reselection Time In History Ping-Pong Reselection Record") was filed by Beijing Xiaomi Mobile Software on Nov 15, 2017. The application was issued on Nov 13, 2019.

Patent oppositions filed by competitors challenge the validity of a granted patent. These oppositions are typically based on claims of prior art, lack of novelty, or non-obviousness. They are a key part of the process for determining a patent's strength and enforceability.
The dossier documents provide a comprehensive record of the patent's prosecution history - including filings, correspondence, and decisions made by patent offices - and are crucial for understanding the patent's legal journey and any challenges it may have faced during examination.
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