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24-463: (Redirected from Xda ) XDA may refer to: O2 Xda , a brand of smartphone and pocket PC phone XDA Flame , pocket PC device of the O2 Xda device family XDA Developers , technology website whose name references the above phone model The IATA Code for Seyresse Airport , France The ICAO Code for Bureau Veritas , France Topics referred to by

48-528: A "packet scheduler", but it operates on a "request-grant" principle where the user equipment (UE) requests permission to send data and the scheduler decides when and how many UEs will be allowed to do so. A request for transmission contains data about the state of the transmission buffer and the queue at the UE and its available power margin. However, unlike HSDPA, uplink transmissions are not orthogonal to each other. In addition to this "scheduled" mode of transmission,

72-475: A growing number delivered 21 Mbit/s peak data downlink. CDMA2000 - EVDO networks had the early lead on performance. In particular, Japanese providers were highly successful benchmarks for this network standard. However, this later changed in favor of HSDPA, as an increasing number of providers worldwide began adopting it. In 2007, an increasing number of telcos worldwide began selling HSDPA USB modems to provide mobile broadband connections. In addition,

96-450: Is a 3G mobile telephony protocol in the HSPA family. It is specified and standardized in 3GPP Release 6 to improve the uplink data rate to 5.76 Mbit/s, extend capacity, and reduce latency. Together with additional improvements, this allows for new features such as Voice over Internet Protocol (VoIP), uploading pictures, and sending large e-mail messages. HSUPA was the second major step in

120-714: Is different from Wikidata All article disambiguation pages All disambiguation pages O2 Xda The first product released in the XDA range. The successor to the Xda, the Xda II , was released in November 2003. The Xda IIi was released in February 2005. The Xda IIs was released in November 2004. O2 Germany released the device as Xda III. The Xda IQ was released in 2005 and runs Windows Mobile 5 Smartphone Edition. The Xda Exec

144-467: 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 TTI is 2 milliseconds. 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). Categories 1-4 and 11 have inter-TTI intervals of 2 or 3, which reduces the maximum data rate by that factor. Dual-Cell and MIMO 2x2 each multiply

168-427: Is the first dual processor PDA-phone announced by O2 in late 2006 and contains enhanced screen graphics, movie playback, photo viewing, and gaming performance. Xda Atom Life is one of the fastest HSDPA 3.5G PDAphones, announced by O2 in early 2007 and has enhanced multimedia capabilities. It also has Windows Mobile 6.0 operating system, the upgrade from WM5.0. The Xda Zest is an O2 branded Asus P565 handset. The Zest

192-662: The HTC P6500 handset and was released in July 2008. The Xda Stellar was released on 26 November 2007. HSDPA High Speed Packet Access ( HSPA ) is an amalgamation of two mobile protocols —High Speed Downlink Packet Access (HSDPA) and High Speed Uplink Packet Access (HSUPA)—that extends and improves the performance of existing 3G mobile telecommunication networks using the WCDMA protocols. A further-improved 3GPP standard called Evolved High Speed Packet Access (also known as HSPA+)

216-518: The round-trip time for applications. HSDPA was introduced in 3GPP Release 5. It was accompanied by an improvement to the uplink that provided a new bearer of 384 kbit/s (the previous maximum bearer was 128 kbit/s). Evolved High Speed Packet Access (HSPA+), introduced in 3GPP Release 7, further increased data rates by adding 64QAM modulation, MIMO , and Dual-Carrier HSDPA operation. Under 3GPP Release 11, even higher speeds of up to 337.5 Mbit/s were possible. The first phase of HSDPA

240-709: 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 stations. The upgrade to HSDPA is often just a software update for WCDMA networks. In HSDPA, voice calls are usually prioritized over data transfer. 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. The per-cell, per-stream data rate

264-794: The UMTS evolution process. It has since been superseded by newer technologies with higher transfer rates, such as LTE (150 Mbit/s for downlink and 50 Mbit/s for uplink) and LTE Advanced (maximum downlink rates of over 1 Gbit/s). HSUPA adds a new transport channel to WCDMA, called the Enhanced Dedicated Channel (E-DCH). It also features several improvements similar to those of HSDPA, including multi-code transmission, shorter transmission time interval enabling faster link adaptation , fast scheduling, and fast hybrid automatic repeat request (HARQ) with incremental redundancy, making retransmissions more effective. Similar to HSDPA, HSUPA uses

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288-472: The data rate for scheduled and non-scheduled flows independently. The maximum data rate of each non-scheduled flow is configured at call setup, and typically not frequently changed. The power used by the scheduled flows is controlled dynamically by the Node B through absolute grant (consisting of an actual value) and relative grant (consisting of a single up/down bit) messages. At the physical layer , HSUPA introduces

312-637: The downlink and up to twice as much system capacity in the uplink compared with original WCDMA protocol. High Speed Downlink Packet Access ( HSDPA ) is an enhanced 3G (third-generation) mobile communications protocol in the High-Speed Packet Access (HSPA) family. HSDPA is also known as 3.5G and 3G+ . It allows networks based on the Universal Mobile Telecommunications System (UMTS) to have higher data speeds and capacity. HSDPA also decreases latency , and therefore

336-533: The following new channels: The following table shows uplink speeds for the different categories of HSUPA: Further UE categories were defined from 3GGP Release 7 onwards as Evolved HSPA (HSPA+) and are listed in Evolved HSUPA UE Categories . Evolved HSPA (also known as HSPA Evolution, HSPA+) is a wireless broadband standard defined in 3GPP release 7 of the WCDMA specification. It provides extensions to

360-636: The front for video calls, and a 2-megapixel camera on the back. Other hardware specifications are very similar to the ones of the Mini S. This candybar sized phone was announced in March 2007 and supports both 3G and WiFi. A ROM upgrade is available on the O2 website for Windows Mobile 6 The O2 Xda Stealth was O2's attempt to make a normal mobile phone with GPS while still having full Windows Mobile and PIM Capabilities. This phone has mostly generated average reviews. The XDA Flame

384-632: The maximum data rate by 2, because multiple independent transport blocks are transmitted over different carriers or spatial streams, respectively. The data rates given in the table are rounded to one decimal point. Further UE categories were defined from 3GGP Release 7 onwards as Evolved HSPA ( HSPA+ ) and are listed in Evolved HSDPA UE Categories . As of 28 August 2009 , 250 HSDPA networks had commercially launched mobile broadband services in 109 countries. 169 HSDPA networks supported 3.6 Mbit/s peak downlink data throughput, and

408-400: The popularity of HSDPA landline replacement boxes grew—these provided HSDPA for data via Ethernet and Wi-Fi , as well as ports for connecting traditional landline telephones. Some were marketed with connection speeds of "up to 7.2 Mbit/s" under ideal conditions. However, these services could be slower, such as when in fringe coverage indoors. High-Speed Uplink Packet Access ( HSUPA )

432-659: The same dimensions as the Xda mini, but has much improved features. The Xda Atom was released in Asia-Pacific region only. The Xda Neo was launched by O2 Germany at the CeBIT show in March 2006. Its shape and size are very similar to those of the Xda II mini. Announced in May 2006, it will be the second 3G -enabled model in the xda range. Like the Exec, it will have two CMOS cameras - a VGA camera on

456-403: The same term [REDACTED] This disambiguation page lists articles associated with the title XDA . If an internal link led you here, you may wish to change the link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=XDA&oldid=1209275820 " Category : Disambiguation pages Hidden categories: Short description

480-505: The standards allow a self-initiated transmission mode from the UEs, denoted "non-scheduled". The non-scheduled mode can, for example, be used for VoIP services for which even the reduced TTI and the Node B based scheduler are unable to provide the necessary short delay time and constant bandwidth. Each MAC-d flow (i.e., QoS flow) is configured to use either scheduled or non-scheduled modes. The UE adjusts

504-560: Was released in July 2005 and is the first Xda to run Windows Mobile 5 , with highest speed processor at the time. ROM upgrade available at [1] for UK/Irish users. Only released in Europe. The Xda Mini S was released shortly after the Xda Exec, and was the second Xda to run Windows Mobile 5 . The Xda Atom is the latest Model to be released in Asia. It runs Windows Mobile 5 and has approximately

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528-580: Was released in November 2008. It has a 3.2Mp camera, 802.11b/g WiFi, HSDPA , GPS , and 2.8 inch 65k colour touchscreen with a resolution of 640x480 pixels. The Xda Serra is an O2 branded version of the HTC Touch Pro handset was released in November 2008. The Xda Ignito is an O2 branded version of the HTC Touch Diamond handset was released in August 2008. The Xda Mantle is an O2 branded version of

552-484: Was released late in 2008, with subsequent worldwide adoption beginning in 2010. The newer standard allows bit rates to reach as high as 337 Mbit/s in the downlink and 34 Mbit/s in the uplink; however, these speeds are rarely achieved in practice. 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. They also reduced latency and provided up to five times more system capacity in

576-606: Was specified in 3GPP Release 5. This phase introduced new basic functions and was aimed to achieve peak data rates of 14.0 Mbit/s with significantly reduced latency. The improvement in speed and latency reduced the cost per bit and enhanced support for high-performance packet data applications. 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). Additional new features include

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