High-Speed Uplink Packet Access
From Wikipedia, the free encyclopedia
 |
This article needs additional citations for verification. Please help improve this article by adding reliable references. Unsourced material may be challenged and removed. (March 2009) |
High-Speed Uplink Packet Access (HSUPA) is a 3G mobile telephony protocol in the HSPA family with up-link speeds up to 5.76 Mbit/s. The name HSUPA was created by Nokia. The 3GPP does not support the name 'HSUPA', but instead uses the name Enhanced Uplink (EUL).[1]
The specifications for HSUPA are included in Universal Mobile Telecommunications System Release 6 standard published by 3GPP. – "The technical purpose of the Enhanced Uplink feature is to improve the performance of uplink dedicated transport channels, i.e. to increase capacity and throughput and reduce delay."
Contents |
[edit] Description
HSUPA uses an uplink enhanced dedicated channel (E-DCH) on which it will employ link adaptation methods similar to those employed by HSDPA, namely:
- shorter Transmission Time Interval enabling faster link adaptation;
- HARQ (hybrid ARQ) with incremental redundancy making retransmissions more effective.
Similarly to HSDPA, HSUPA uses a packet scheduler, but it operates on a request-grant principle where the UEs request a 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 the standards also allows 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 will not be able to provide the very short delay time and constant bandwidth required.
Each MAC-d flow (i.e. QoS flow) is configured to use either scheduled or non-scheduled modes; the UE adjusts 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 changed frequently. 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 Layer 1, HSUPA introduces new physical channels E-AGCH (Absolute Grant Channel), E-RGCH (Relative Grant Channel), F-DPCH (Fractional-DPCH), E-HICH (E-DCH Hybrid ARQ Indicator Channel), E-DPCCH (E-DCH Dedicated Physical Control Channel) and E-DPDCH (E-DCH Dedicated Physical Data Channel).
E-DPDCH is used to carry the E-DCH Transport Channel; and E-DPCCH is used to carry the control information associated with the E-DCH.
[edit] Versions
The following table gives uplink speeds for the different categories of HSUPA.
| HSUPA Category | Max Uplink Speed | Examples |
|---|---|---|
| Category 1 | 0.73 Mbit/s | |
| Category 2 | 1.46 Mbit/s | |
| Category 3 | 1.46 Mbit/s | |
| Category 4 | 2.93 Mbit/s | Qualcomm 6290 |
| Category 5 | 2.00 Mbit/s | Nokia: E52, E55, 6700 Classic, N900, 5630 XpressMusic; BlackBerry: Storm 9500, 9530; HTC: Dream; Sony Ericsson: C510 |
| Category 6 | 5.76 Mbit/s | BlackBerry Tour 9630, Nokia CS-15, Samsung i8910 |
| Category 7 (3GPP Rel7) | 11.5 Mbit/s |
[edit] Roadmap
After HSUPA the 3GPP is working on further advancing transfer rates. LTE provides up to 326.4 Mbit/s for downlink and 86.4 Mbit/s for uplink. LTE-Advanced, in development as a minor update to LTE networks, supports maximum download rates of over 1 Gbit/s.
[edit] See also
[edit] References
[edit] Bibliography
- Harri Holma and Antti Toskala (2006). HSDPA/HSUPA for UMTS: High Speed Radio Access for Mobile Communications. ISBN 0470018844.
|
|||||||||||||||||||||||||||||||||||||||||||||||||
| Internet access | ||||||||
|---|---|---|---|---|---|---|---|---|
| Network type | Wired | Wireless | ||||||
| Optical | Coaxial cable | Twisted pair | Phone line | Power line | Unlicensed terrestrial bands | Licensed terrestrial bands | Satellite | |
| LAN | Ethernet | G.hn | Ethernet | HomePNA · G.hn | G.hn | Wi-Fi · Bluetooth · DECT · Wireless USB | ||
| WAN | PON · Ethernet | DOCSIS | Ethernet | Dial-up · ISDN · DSL | BPL | Muni Wi-Fi | GPRS · iBurst · WiBro/WiMAX · UMTS-TDD, HSPA · EVDO · LTE | Satellite |
|
||||||||||||||||||||||||||
 |
This article related to telecommunications is a stub. You can help Wikipedia by expanding it. |
