A growing number are delivering 21 Mbit/s peak data downlink and 28 Mbit/s.ĬDMA2000- EVDO networks had the early lead on performance, and Japanese providers were highly successful benchmarks for it. 169 HSDPA networks support 3.6 Mbit/s peak downlink data throughput. The data rates given in the table are rounded to one decimal point.įurther UE categories were defined from 3GGP Release 7 onwards as Evolved HSPA ( HSPA+) and are listed in Evolved HSDPA UE Categories.Īs of 28 August 2009, 250 HSDPA networks have commercially launched mobile broadband services in 109 countries. Dual-Cell and MIMO 2x2 each multiply the maximum data rate by 2, because multiple independent transport blocks are transmitted over different carriers or spatial streams, respectively. Categories 1-4 and 11 have inter-TTI intervals of 2 or 3, which reduces the maximum data rate by that factor. So, for example, Cat 10 can decode 27,952 bits/2 ms = 13.976 Mbit/s (and not 14.4 Mbit/s as often claimed incorrectly). The per-cell per-stream data rate is limited by the "maximum number of bits of an HS-DSCH transport block received within an HS-DSCH TTI" and the "minimum inter-TTI interval". The following table is derived from table 5.1a of the release 11 of 3GPP TS 25.306 and shows maximum data rates of different device classes and by what combination of features they are achieved.
In general, voice calls are usually prioritized over data transfer.
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The upgrade to HSDPA is often just a software update for WCDMA networks. Further new features are the High Speed Downlink Shared Channels (HS-DSCH), quadrature phase-shift keying, 16- quadrature amplitude modulation, and the High Speed Medium Access protocol (MAC-hs) in base station. HSDPA is based on shared channel transmission, and its key features are shared channel and multi-code transmission, higher-order modulation, short transmission time interval (TTI), fast link adaptation and scheduling, and fast hybrid automatic repeat request (HARQ). The improvement in speed and latency reduces the cost per bit and enhances support for high-performance packet data applications. Phase one introduced new basic functions and was aimed to achieve peak data rates of 14.0 Mbit/s with significantly reduced latency. The first phase of HSDPA was specified in the 3GPP release 5. Even higher speeds of up to 337.5 Mbit/s are possible under 3GPP Release 11. Evolved High Speed Packet Access (HSPA+), which was introduced in 3GPP Release 7, further increased data rates by adding 64QAM modulation, MIMO, and Dual-Carrier HSDPA operation.
HSDPA also decreases latency and therefore the round trip time for applications.
The previous maximum bearer was 128 kbit/s. HSDPA was introduced with 3GPP Release 5, which also accompanied an improvement on the uplink providing a new bearer of 384 kbit/s. It allows networks based on the Universal Mobile Telecommunications System (UMTS) to have higher data speeds and capacity. High Speed Downlink Packet Access ( HSDPA) is an enhanced 3G (third-generation) mobile communications protocol in the High-Speed Packet Access (HSPA) family. High Speed Downlink Packet Access (HSDPA) It also reduced latency and provided up to five times more system capacity in the downlink and up to twice as much system capacity in the uplink compared with original WCDMA protocol. The first HSPA specifications supported increased peak data rates of up to 14 Mbit/s in the downlink and 5.76 Mbit/s in the uplink. 4 Evolved High Speed Packet Access (HSPA+).3 High Speed Uplink Packet Access (HSUPA).2 High Speed Downlink Packet Access (HSDPA).
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