High-Speed Downlink Packet Access (HSDPA) - Revision history

Hanj2: /* See Also */

2009-04-13T03:08:24Z

Hanj2: /* Uses & Comparison */

2009-04-13T03:07:10Z

Uses & Comparison

← Older revision		Revision as of 03:07, 13 April 2009
Line 28:		Line 28:
	There are many products that are already using HSDPA technology. Mainly HSDPA is being used in mobile telecommunication system because of it has a high speed of data transmission. As many users know, famous Apple iPhone 3G and BlackBerry Storm are also using HSDPA technology to have better and fast data transfer. With a high speed, user can do many activities on device, such as music download, mobile video games, video telephony, movie downloads, and broadcast television.		There are many products that are already using HSDPA technology. Mainly HSDPA is being used in mobile telecommunication system because of it has a high speed of data transmission. As many users know, famous Apple iPhone 3G and BlackBerry Storm are also using HSDPA technology to have better and fast data transfer. With a high speed, user can do many activities on device, such as music download, mobile video games, video telephony, movie downloads, and broadcast television.

-	The HSDPA has remarkable data transfer speed even compare to other exist technologies, such as W-CDMA; known as [[3g]] as well, EDGE, GPRS, and GSM.	+	The HSDPA has remarkable data transfer speed even compare to other exist technologies, such as W-CDMA; known as [[3g]] as well, EDGE, GPRS, and [[Global Systems for Mobile Communications (GSM)]].

	[[Image:HSDPA_Speed.gif]] [[Image:HSDPA_usage.gif]]		[[Image:HSDPA_Speed.gif]] [[Image:HSDPA_usage.gif]]

Hanj2: /* See Also */

2009-04-13T03:06:51Z

Hanj2: /* External Links */

2009-04-13T03:01:20Z

External Links

← Older revision		Revision as of 03:01, 13 April 2009
Line 67:		Line 67:


-	--[[User:Hanj2\|Hanj2]] 21:18, 12 April 2009 (EDT)Junsub Han 0468304	+	--[[User:Hanj2\|Hanj2]] 21:18, 12 April 2009 (EDT) Junsub Han 0468304

Hanj2 at 03:01, 13 April 2009

2009-04-13T03:01:06Z

← Older revision		Revision as of 03:01, 13 April 2009
Line 1:		Line 1:
-	'''High Speed ~~Downlonk~~ Packet Access''' is a 3.5G [G stands for generation] technology. HSDPA, short for High Speed Downlink Package Access is a ~~new~~ new mobile telephony protocol, which allows to have high data speed transmission and large amounts of capacity. It will provide download speed on a mobile phone same as an [[Asymmetric Digital Subscriber Line]] [ADSL]. HSDPA can ~~archieve~~ data transmission Speed of 8-10 Mbit/s. For future improvement, HSDPA provides up to 42Mbit/s data transmission speed.	+	'''High Speed Downlink Packet Access''' is a 3.5G [G stands for generation] technology. HSDPA, short for High Speed Downlink Package Access is a new mobile telephony protocol, which allows to have high data speed transmission and large amounts of capacity. It will provide download speed on a mobile phone same as an [[Asymmetric Digital Subscriber Line]] [ADSL]. HSDPA can archive data transmission Speed of 8-10 Mbit/s. For future improvement, HSDPA provides up to 42Mbit/s data transmission speed.



	== Technology ==		== Technology ==
-	High Speed Downlink Packet Access technology is based on [http://www.wisegeek.com/what-is-umts.htm Universal Mobile Telecommunications System] [UMTS] standard that enhances the capabilities of [[3g]] by enabling higher data transfer rates. Since HSDPA is using [http://en.wikipedia.org/wiki/High-Speed_Downlink_Shared_Channel High Speed Downlink Shared Channel], it has two weak points; ~~variavle~~ spreading factor and fast power control. Therefore, HSDPA implementations includes Multiple-Input Multiple-Output (MIMO), Hybrid Automatic Request (HARQ), fast cell search, Adaptive Modulation and Coding (AMC), and advanced receiver design.	+	High Speed Downlink Packet Access technology is based on [http://www.wisegeek.com/what-is-umts.htm Universal Mobile Telecommunications System] [UMTS] standard that enhances the capabilities of [[3g]] by enabling higher data transfer rates. Since HSDPA is using [http://en.wikipedia.org/wiki/High-Speed_Downlink_Shared_Channel High Speed Downlink Shared Channel], it has two weak points; variable spreading factor and fast power control. Therefore, HSDPA implementations includes Multiple-Input Multiple-Output (MIMO), Hybrid Automatic Request (HARQ), fast cell search, Adaptive Modulation and Coding (AMC), and advanced receiver design.

	[[Image:HSDPA_Share.jpg]] [[Image:HSDPA_Structure.jpg]]		[[Image:HSDPA_Share.jpg]] [[Image:HSDPA_Structure.jpg]]
Line 10:		Line 10:
	=== Multiple-Input Multiple-Output ===		=== Multiple-Input Multiple-Output ===

-	This technology is using more than one antenna to send and receive multiple data streams over the same channel simultaneously in wireless devices, therefore it gives long ranges and high ~~throguhputs~~ in network. This is based on 802.11n wireless transmission standard and it can reach more than 300 feet and still send and receive ~~ddata~~ at 30mbps.	+	This technology is using more than one antenna to send and receive multiple data streams over the same channel simultaneously in wireless devices therefore it gives long ranges and high throughputs in network. This is based on 802.11n wireless transmission standard and it can reach more than 300 feet and still send and receive data at 30mbps.

	=== Adaptive Modulation and Coding ===		=== Adaptive Modulation and Coding ===
Line 18:		Line 18:
	=== Hybrid Automatic Request ===		=== Hybrid Automatic Request ===

-	After first ~~transimission~~ in HSDPA, there are 10% to 20% of error rate. Therefore, the Hybrid Automatic Request (HARQ) mechanism is helped to reduce the delay and increase the efficiency of ~~retansmitting~~ data. Therefore even if a error packet is received, it will ~~combinate~~ with the retransmissions, to have error-free packet.	+	After first transmission in HSDPA, there are 10% to 20% of error rate. Therefore, the Hybrid Automatic Request (HARQ) mechanism is helped to reduce the delay and increase the efficiency of retransmitting data. Therefore even if a error packet is received, it will be combine with the retransmissions, to have error-free packet.

	=== Packet Scheduling ===		=== Packet Scheduling ===
Line 56:		Line 56:
	6. [http://azureness.springnote.com/pages/1330860 H-ARQ (HYBRID AUTOMATIC REQUEST)]		6. [http://azureness.springnote.com/pages/1330860 H-ARQ (HYBRID AUTOMATIC REQUEST)]

-	7. [http://www.3g.co.uk/PR/August2005/1833.htm Advanced HSDPA ~~Technoogy~~ For 3G ~~Wirless~~ Platform]	+	7. [http://www.3g.co.uk/PR/August2005/1833.htm Advanced HSDPA Technology For 3G Wireless Platform]

	== External Links ==		== External Links ==
Line 67:		Line 67:


-	--[[User:Hanj2\|Hanj2]] 21:18, 12 April 2009 (EDT)Junsub Han	+	--[[User:Hanj2\|Hanj2]] 21:18, 12 April 2009 (EDT)Junsub Han 0468304

Hanj2: /* Uses & Comparison */

2009-04-13T02:53:01Z

Uses & Comparison

← Older revision		Revision as of 02:53, 13 April 2009
Line 26:		Line 26:
	== Uses & Comparison ==		== Uses & Comparison ==

-	There are many products that are already using HSDPA technology. ~~The mainly~~ mobile	+	There are many products that are already using HSDPA technology. Mainly HSDPA is being used in mobile telecommunication system because of it has a high speed of data transmission. As many users know, famous Apple iPhone 3G and BlackBerry Storm are also using HSDPA technology to have better and fast data transfer. With a high speed, user can do many activities on device, such as music download, mobile video games, video telephony, movie downloads, and broadcast television.

-	[[Image:HSDPA_Speed.gif]] ~~vvv~~ [[Image:HSDPA_usage.gif]]	+	The HSDPA has remarkable data transfer speed even compare to other exist technologies, such as W-CDMA; known as [[3g]] as well, EDGE, GPRS, and GSM.
		+
		+	[[Image:HSDPA_Speed.gif]] [[Image:HSDPA_usage.gif]]

	== See Also ==		== See Also ==

Hanj2: /* Uses & Comparison */

2009-04-13T01:20:53Z

Uses & Comparison

← Older revision		Revision as of 01:20, 13 April 2009
Line 28:		Line 28:
	There are many products that are already using HSDPA technology. The mainly mobile		There are many products that are already using HSDPA technology. The mainly mobile

-	[[Image:HSDPA_usage.gif]]	+	[[Image:HSDPA_Speed.gif]] vvv [[Image:HSDPA_usage.gif]]
-		+
-		+

	== See Also ==		== See Also ==

Hanj2: /* Comparison */

2009-04-13T01:20:16Z

Comparison

← Older revision		Revision as of 01:20, 13 April 2009
Line 30:		Line 30:
	[[Image:HSDPA_usage.gif]]		[[Image:HSDPA_usage.gif]]

-	~~== Comparison ==~~
-	~~orz~~

-	~~[[Image:HSDPA_Speed.gif]]~~

	== See Also ==		== See Also ==

Hanj2: /* Uses */

2009-04-13T01:20:04Z

Uses

← Older revision		Revision as of 01:20, 13 April 2009
Line 24:		Line 24:
	In HSDPA, the packet scheduling is located in the medium access layer, MAC-hs. The MAC-hs is located in the Node-B, therefore packet scheduling decisions are almost instantaneously executed. With large AMC dynamic range with the HSDPA, the channel allocation is conducted to the most popular packet scheduling method; radio conditions. With this scheduler, the order is determined by the highest instantaneous relative channel quality.		In HSDPA, the packet scheduling is located in the medium access layer, MAC-hs. The MAC-hs is located in the Node-B, therefore packet scheduling decisions are almost instantaneously executed. With large AMC dynamic range with the HSDPA, the channel allocation is conducted to the most popular packet scheduling method; radio conditions. With this scheduler, the order is determined by the highest instantaneous relative channel quality.

-	== Uses ==	+	== Uses & Comparison ==

	There are many products that are already using HSDPA technology. The mainly mobile		There are many products that are already using HSDPA technology. The mainly mobile

Hanj2 at 01:18, 13 April 2009

2009-04-13T01:18:20Z

← Older revision		Revision as of 01:18, 13 April 2009
Line 68:		Line 68:

	3. [http://ixbtlabs.com/articles2/mobile/wimax.html HSDPA vs. WiMAX]		3. [http://ixbtlabs.com/articles2/mobile/wimax.html HSDPA vs. WiMAX]
		+
		+
		+	--[[User:Hanj2\|Hanj2]] 21:18, 12 April 2009 (EDT)Junsub Han

← Older revision		Revision as of 03:08, 13 April 2009
Line 43:		Line 43:

	5. [[Global Systems for Mobile Communications (GSM)]]		5. [[Global Systems for Mobile Communications (GSM)]]
		+
		+	6. [[Wi-Fi]]

	== Reference ==		== Reference ==

← Older revision		Revision as of 03:06, 13 April 2009
Line 41:		Line 41:

	4. [http://en.wikipedia.org/wiki/High-Speed_Uplink_Packet_Access High Speed Uplink Packet Access]		4. [http://en.wikipedia.org/wiki/High-Speed_Uplink_Packet_Access High Speed Uplink Packet Access]
		+
		+	5. [[Global Systems for Mobile Communications (GSM)]]

	== Reference ==		== Reference ==