Hsupa Hsdpa

April 3, 2010 1:38 pm | Wireless Networking

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Hsupa Detail

What is HSU PA ? What is HSUPA it? HSUPA (high speed uplink packetaccess) is called High Speed Uplink Packet Access.

We all know WCDMA Rel5 in HSDPA Is the WCDMA downlink direction (from the wireless access network to Mobile Terminal direction) for the optimization and evolution of business groups. Similar with HSDPA, HSUPA is the uplink direction (from mobile terminal to a wireless access network direction) for the optimization and evolution of business groups. HSUPA is the second after HSDPA, WCDMA standards are another important evolution. HSUPA standardization work will be completed in 2005, embodied in the 3G PP WCDMA R6's specification. Using HSUPA technology, the user's peak transfer rate up to increase 2-5 times, HSUPA also allows residential uplink throughput of WCDMA R99 more than 20-50%.

HSUPA technology used in three main

HSUPA uses three main techniques: the physical layer hybrid ARQ, based on NodeB fast scheduling, and 2msTTI short frame transmission. These technologies will be introduced below.

Physical layer hybrid ARQ [L1 (Fast) HARQ]: In WCDMAR99, the data packet retransmission is controlled by the RNC RLC retransmission completed. In AM mode, RLC retransmission RLC signaling is involved and Iub interface, transmission, retransmission delay over 100ms. HSUPA is defined in a physical layer packet retransmission, packet retransmission between the mobile terminal and base station directly, the base station receive the mobile terminal will send data packets through the air interface to the mobile terminal to send ACK / NACK signaling, if the received ACK packet to send the correct signal is, if the received packet errors on the transmission of NACK signal, mobile terminal through the ACK / NACK of the instructions, you can quickly re-send the packet transmission errors. Because bypassing the Iub interface to transfer, in 10msTTI, the re-transmission delay shortened to 40ms. In the HSUPA physical layer hybrid ARQ mechanism, also used to the soft combined (softcombing) and incremental redundancy (IncrementalRedundancy), increased retransmission packet transmission accuracy.

Fast Node B based scheduling (NodeB Scheduling): In WCDMAR99, the mobile terminal transmission rate by the RNC controlled scheduling, mobile terminals available to establish the maximum transfer rate when the DCH determined by the RNC, RNC can not be under cell load and mobile terminals, flexible control of the channel conditions change the transmission rate of mobile terminals. NodeB fast scheduling based on the core idea is to control the mobile terminal by the base station transmission data rate and transmission time. According to the load cell base station, the user channel quality and transmission of data required to determine the status of mobile terminals currently available maximum transmission rate. When the mobile terminal hopes to send a higher data rate, the mobile terminal sends a request signal to the base station, base station according to the load cell and the scheduling policy to decide whether mobile terminal requests. If the base station agreed to the request of mobile terminals, base stations, mobile terminals to send signaling to improve the maximum available data rate. When the mobile terminal does not send the data over time, the base stations, mobile terminals will automatically reduce the maximum available data rate. Since these scheduling signaling is directly between the base station and mobile terminal transmission, so based on NodeB fast scheduling mechanism to allow the flexibility to quickly control the cell base station within the mobile terminal transmission rate, so the wireless network resources more effectively Service Burst data in a user visits, so as to achieve the effect of increased cell throughput.

2msTTI and 10 ms TTI: WCDMA R99 DCH uplink transmission time interval (TTI) to 10ms, 20ms, 40ms, 80ms. In HSUPA, the use of the 10msTTI to reduce the transmission delay. Although the introduction of HSUPA also 2msTTI of transmission, to further reduce the transmission delay, but the short frame transmission based on 2msTTI not suitable for work in the cell edge.
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