High-Speed Downlink Packet Access (HSDPA, also known as High-Speed Data Packet Access) is 3G (third generation) mobile telephony communications protocol in the High-Speed Packet Access (HSPA) family, also dubbed, which allows networks based on Universal Mobile Telecommunications System (UMTS) to have higher data transfer speeds and capacity. Current HSDPA deployments support down-link speeds of up to 42 Mbit/s. Further speed increases are available with HSPA+, which provides speeds of up to 337 Mbit/s with Release 11 of the 3GPP standards.
Read more about High-Speed Downlink Packet Access: User Equipment (UE) Categories
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