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Dual-Cell HSDPA

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Dual-Cell HSDPA (also known as: Dual-Carrier HSPA or Dual-Cell HSPA) is a wireless broadband standard based on HSPA that is defined in 3GPP UMTS release 8.

Dual Cell (DC-)HSDPA is the natural evolution of HSPA by means of carrier aggregation in the downlink[1]. UMTS licenses are often issued as 10 or 15 MHz paired spectrum allocations. The basic idea of the multicarrier feature is to achieve better resource utilization and spectrum efficiency by means of joint resource allocation and load balancing across the downlink carriers.

An advanced HSPA network can theoretically support up to 28 Mbit/s and 42 Mbit/s with a single 5 MHz carrier for Rel7 (MIMO with 16QAM) and Rel8 (64-QAM + MIMO), in good channel condition with low correlation between transmit antennas. An alternative method to double the data rates is to double the bandwidth, i.e. 10 MHz by using DC-HSDPA. Additionally, some diversity and joint scheduling gains can also be expected [2] with improved QoS for end users in poor environment conditions where existing techniques such as MIMO spatial multiplexing cannot be used to increase data rates. In 3GPP a study item was completed in June 2008. The outcome can be found in a technical report [3]. New HSDPA [[User Equipment categories 21-24 have been introduced that support DC-HSDPA. DC-HSDPA can support up to 42Mbit/s, but unlike HSPA, it does not need to rely on MIMO transmission.

From Release 9 onwards it will be possible to use DC-HSDPA in combination with MIMO used on both carrier[4]. The support of MIMO in combination with DC-HSDPA will allow operators deploying Release 7 MIMO to benefit from the DC-HSDPA functionality as defined in Release 8. While in Release 8 DC-HSPDA can only operate on adjacent carriers, Release 9 allow that the paired cells can operate on two different frequency bands.

Deployments

The specification was completed in December 2008. Telstra in Australia announced they had implemented the protocol in their live NextG network on 18 January 2010. On 15 February 2010 they announced that the upgrade had been completed to section of their network in capital cities and major regional centers. As of July 2010, two devices were available; a USB device manufactured by Sierra Wireless, the AirCard 312U, and a portable WiFi hot spot device.

In August 2010, Telus in Canada announced that they have completed tests and are working to deploy in the first quarter of 2011.[5]

In October 2010, Vodafone in Portugal announced[6] a commercial offer of 43.2 Mbit/s download and 11.4 Mbit/s upload. The service is currently available in Lisbon.

On Nov 18 2010, Bell Canada announced it would begin doubling its network speeds to 42 Mbit/s beginning Nov 23 2010 using HSPA+ Dual Cell technology.[7]

On December 3, 2010, E Mobile in Japan announced the availability of 42 Mbit/s service based upon DC-HSDPA.[8]

On March 10, 2011, SaskTel announced that Dual-Cell HSPA+ will be available in Saskatoon and Regina by the summer.[9] SaskTel also announced that the first device to take advantage of this new technology will be the Novatel Wireless MC547 Mobile Internet Stick.

On August 23, 2011, Telenor Hungary started Dual-Cell HSPA+ service in Budapest and its surroundings. [10]

In 2011, Viva Telecom Kuwait started started offering Dual-Cell HSPA+ to its customers. [11]

Also in 2011 two carriers in Finland, Elisa and DNA started offering "4G" backed up by Dual-Cell HSPA+ whereas LTE coverage is merely spotty in nature. [12] [13]

References

  1. ^ Nomor Research White Paper: Dual-Cell HSDPA and its Evolution
  2. ^ [R1-081546, “Initial multi-carrier HSPA performance evaluation”, Ericsson, 3GPP TSG-RAN WG1 #52bis, April, 2008.]
  3. ^ 3GPP TR 25.825 (V1.0.0) “Dual Cell HSDPA Operation”
  4. ^ Nomor 3GPP Newsletter 2009-03: Standardisation updates on HSPA Evolution
  5. ^ TELUS to increase Canada's fastest wireless data network speeds
  6. ^ Vodafone Portugal rolls out Mobile Broadband at speeds up to 43.2 Mbps
  7. ^ Bell doubling data speeds on world-leading HSPA+ wireless network
  8. ^ [1]
  9. ^ http://sasktel.com/about-us/news/2011-news-releases/sasktel-wireless-network-classified-as-4g-province-wide.html
  10. ^ http://www.telenor.hu/en/internet/coverage/
  11. ^ https://www.viva.com.kw/personal-internet
  12. ^ http://www.elisa.com/on-elisa/140/130.00/17617/
  13. ^ http://www.sttinfo.fi/pressrelease/detail.do?pressId=41036&type=thisweek&searchKey=350ef1f0-2562-11e1-b131-ad87812695ee&languageId=all&pageIndex=1

Literature

  • Harri Holma and Antti Toskala (2006). HSDPA/HSUPA for UMTS: High Speed Radio Access for Mobile Communications. ISBN 0470018844.

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