HSPA is a packet communications system, an expansion to the W-CDMA system, which combines HSDPA (High Speed Downlink Packet Access) for enhancing the downlink data rates and HSUPA (High Speed Uplink Packet Access) for enhancing the uplink data rates. NTT DOCOMO launched the HSDPA service in August 2006 and has been supporting the maximum data rate of 14 Mbps in the downlink since June 2011. In June 2009, it launched the HSUPA service providing maximum data rate of 5.7 Mbps in the uplink.
R&D on HSPA is explained on PDF.
Special Articles on HSDPA/HSDPA Overview and Development of Radio Network Equipment
The HSDPA service commerced in August 2006 was developed aiming at greater speed, lower cost and reduced delays of W-CDMA. This article describes the technical characteristics of HSDPA, and the development of functions for the radio network equipment.
Special Articles on HSDPA/HSDPA Overview and Development of Radio Network Equipment (PDF format:948KB) 9 pages
Special Articles on HSDPA/HSDPA Terminal Development and Radio Transmission Performance
Two new HSDPA compatible mobile terminals have been developed for the HSDPA service commenced in August 2006. This article outlines these terminals and describes the radio transmission throughput performance based on field experiments.
Special Articles on HSDPA/HSDPA Terminal Development and Radio Transmission Performance (PDF format:868KB) 6 pages
HSPA-related Technical Journals
This is the introduction of the Technical Journals that carry HSPA-related articles.
- VOL.10 NO.2
Special Articles on Technology Supporting Large-capacity and High-efficiency Communication in the Flat-rate Era/Data-communications Terminals with Downlink Speeds up to 7.2 Mbit/s to Meet the Increasing Demand for High-speed Data Communications
- VOL.8 NO.3
HSDPA Overview and Development of Radio Network Equipment
HSDPA Terminal Development and Radio Transmission Performance
Special Articles on HSDPA/System Development for Music Channel Service Using HSDPA
- VOL.6 NO.4
HSDPA Throughput Performances Using an Experimental HSDPA Transmission System