10-11-2012, 12:32 PM
HSPA/HSDPA (Beyond 3G)
[attachment=38901]
HSPA - Introduction
High Speed Packet Access (HSPA) is an amalgamation of two mobile telephony 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 utilizing the WCDMA protocols.
HSPA evolution first introduced downlink counterpart called HSDPA in Release 5.
Uplink evolution followed later in Release 6 by the name of HSUPA.
HSPA was originally designed for non-real time traffic with high transmission rate requirements.
FEATURES-
HSPA improves the end-user experience by:
• increasing peak data rates to 14 Mbit/s in the downlink and 5.8 Mbit/s in the uplink
• reducing latency
• providing up to five times more system capacity in the downlink and up to twice as much system capacity in the uplink, reducing the production cost per bit
link adaptation in downlink
TECHNOLOGIES USED-
Shared-channel transmission, which results in efficient use of available code and power resources in WCDMA.
A shorter Transmission Time Interval (TTI) , which reduces round-trip time and improves the tracking of fast channel variations.
Link adaptation, which maximizes channel usage and enables the base station to operate at close to maximum cell power.
Fast scheduling, which provides users with the most suitable channel conditions.
Fast retransmission and soft-combining, which further increase the capacity.
16QAM and 64QAM , which yields higher bit-rates.
MIMO, which exploits antenna diversity to provide further improvements in bit-rates and system capacity.
HSDPA
In WCDMA 3GPP Release 5, HSDPA adds a new transport channel to WCDMA– the High Speed Downlink Shared Channel (HS-DSCH) – which provides enhanced support for high-performance packet data applications in the downlink.
The improved downlink provides up to 14 Mbit/s with significantly reduced latency. Current devices support 7.2 Mbps throughput.
order to support HSDPA features with minimal impact on the existing radio interface protocol architecture, a new MAC sub-layer, MAC-hs, has been introduced. It enables a functional split to be retained between layers and nodes from WCDMA 3GPP Releases 99 and 4.
HSPA+ (Second Phase of HSDPA)
The second phase of HSDPA is specified in the 3GPP release7.
Provides smooth inter-networking between HSPA and LTE, thereby facilitating the operation of both technologies.
Higher-order modulation can be supported in both uplink
(16QAM) and downlink (64QAM).
16QAM modulation enables peak data rates of 12 Mbit/s in the uplink, while 64QAM modulation enables peak data rates of 21 Mbit/s in the downlink.
It introduces antenna array technologies such as beamforming and Multiple-input multiple-output communications (MIMO).
DUAL CELL HSDPA
Part of 3GPP Release 8.
Allows a user to connect to two cells at once, thereby theoretically doubling the connection speeds for the user.
Can support up to 28 Mbit/s and 42 Mbit/s with a single 5 MHz carrier in Rel7 (MIMO with 16QAM) and Rel8 (64-QAM + MIMO).
While in Release 8 DC-HSPDA can only operate on adjacent carriers, Release 9 also allows that the paired cells can operate on two different frequency bands.
[attachment=38901]
HSPA - Introduction
High Speed Packet Access (HSPA) is an amalgamation of two mobile telephony 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 utilizing the WCDMA protocols.
HSPA evolution first introduced downlink counterpart called HSDPA in Release 5.
Uplink evolution followed later in Release 6 by the name of HSUPA.
HSPA was originally designed for non-real time traffic with high transmission rate requirements.
FEATURES-
HSPA improves the end-user experience by:
• increasing peak data rates to 14 Mbit/s in the downlink and 5.8 Mbit/s in the uplink
• reducing latency
• providing up to five times more system capacity in the downlink and up to twice as much system capacity in the uplink, reducing the production cost per bit
link adaptation in downlink
TECHNOLOGIES USED-
Shared-channel transmission, which results in efficient use of available code and power resources in WCDMA.
A shorter Transmission Time Interval (TTI) , which reduces round-trip time and improves the tracking of fast channel variations.
Link adaptation, which maximizes channel usage and enables the base station to operate at close to maximum cell power.
Fast scheduling, which provides users with the most suitable channel conditions.
Fast retransmission and soft-combining, which further increase the capacity.
16QAM and 64QAM , which yields higher bit-rates.
MIMO, which exploits antenna diversity to provide further improvements in bit-rates and system capacity.
HSDPA
In WCDMA 3GPP Release 5, HSDPA adds a new transport channel to WCDMA– the High Speed Downlink Shared Channel (HS-DSCH) – which provides enhanced support for high-performance packet data applications in the downlink.
The improved downlink provides up to 14 Mbit/s with significantly reduced latency. Current devices support 7.2 Mbps throughput.
order to support HSDPA features with minimal impact on the existing radio interface protocol architecture, a new MAC sub-layer, MAC-hs, has been introduced. It enables a functional split to be retained between layers and nodes from WCDMA 3GPP Releases 99 and 4.
HSPA+ (Second Phase of HSDPA)
The second phase of HSDPA is specified in the 3GPP release7.
Provides smooth inter-networking between HSPA and LTE, thereby facilitating the operation of both technologies.
Higher-order modulation can be supported in both uplink
(16QAM) and downlink (64QAM).
16QAM modulation enables peak data rates of 12 Mbit/s in the uplink, while 64QAM modulation enables peak data rates of 21 Mbit/s in the downlink.
It introduces antenna array technologies such as beamforming and Multiple-input multiple-output communications (MIMO).
DUAL CELL HSDPA
Part of 3GPP Release 8.
Allows a user to connect to two cells at once, thereby theoretically doubling the connection speeds for the user.
Can support up to 28 Mbit/s and 42 Mbit/s with a single 5 MHz carrier in Rel7 (MIMO with 16QAM) and Rel8 (64-QAM + MIMO).
While in Release 8 DC-HSPDA can only operate on adjacent carriers, Release 9 also allows that the paired cells can operate on two different frequency bands.