HSPA+

HSPA+
Name	HSPA+
Alternative names	Evolved High Speed Packet Access, HSPA Evolution
Developer	3rd Generation Partnership Project
Introduced	2008
Preceded by	High Speed Packet Access
Succeeded by	LTE
Related	Universal Mobile Telecommunications System, W-CDMA, Evolved Packet Core

HSPA+

HSPA+ is a mobile telecommunication enhancement standardized by the 3rd Generation Partnership Project that advances High Speed Packet Access performance on Universal Mobile Telecommunications System networks. It builds on technologies associated with W-CDMA radio access and integrates improvements influenced by work within 3GPP Release 7, 3GPP Release 8, and operators such as Nokia, Ericsson, Huawei, Alcatel-Lucent, and Samsung Electronics. Carriers including AT&T, Vodafone Group, T-Mobile US, Verizon Wireless, and Deutsche Telekom deployed HSPA+ as an evolutionary step prior to widespread adoption of LTE.

Overview

HSPA+ is an evolution of enhancements to High Speed Packet Access defined in specifications produced by 3rd Generation Partnership Project working groups, incorporating features from organizations like ITU-R and influenced by chipset roadmaps from vendors such as Qualcomm, MediaTek, and Intel Corporation. Designed to deliver higher user bitrates and lower latency on existing Universal Mobile Telecommunications System infrastructure, HSPA+ provided a migration path for operators constrained by regulatory allocations involving entities such as Federal Communications Commission and national regulators like Ofcom, ANATEL, and Telekom Regulation Commission affiliates. Major network operators used HSPA+ to offer services competitive with fixed broadband offerings from providers including Comcast, BT Group, and Orange S.A..

Technical specifications

HSPA+ incorporates multiple radio-layer and signaling enhancements standardized across 3GPP Releases that include higher-order modulation and advanced antenna techniques developed in collaboration with research institutions and industry consortia such as IEEE. Key technical features include: - 64QAM and 16QAM modulation options originally used in projects studied alongside work by Bell Labs and research groups at University of California, Berkeley, enabling increased spectral efficiency. - Multiple-input multiple-output (MIMO) antenna techniques influenced by standards from ITU-R and adopted by vendors Ericsson and Nokia Siemens Networks, enabling spatial multiplexing gains. - Higher-order channel coding and link adaptation mechanisms refined by 3GPP Working Group RAN participants. - Dual-Carrier HSDPA and Dual-Cell HSPA concepts allowing aggregation across adjacent channels, a precursor to carrier aggregation used in LTE Advanced. - Reduced latency modes and packet scheduling strategies comparable to techniques investigated by groups at Massachusetts Institute of Technology and Stanford University.

The air interface uses existing W-CDMA carriers commonly allocated in frequency bands licensed to operators such as T-Mobile Deutschland, Reliance Jio, Telefónica, and China Mobile. Core network interactions rely on the Evolved Packet Core concepts later formalized for LTE, while interworking functions support roaming with legacy platforms maintained by operators like SK Telecom and SoftBank.

Deployment and evolution

Early commercial rollouts began around 2008–2010 by carriers including Telstra, AT&T, and Vodafone in major markets such as United States, United Kingdom, Japan, Australia, and Germany. Vendor ecosystems involved Ericsson, Huawei, Nokia, Alcatel-Lucent, and ZTE Corporation delivering software upgrades and radio hardware. Operators used HSPA+ to extend service life for 3GPP Release 99 investments while planning migrations to LTE and managing capital expenditure pressures seen by firms like Deutsche Telekom AG and Sprint Corporation. Subsequent evolution path elements were integrated into 3GPP Release 9 and Release 10 documents that also addressed interworking with packet-core upgrades found in deployments by Orange S.A. and Vodafone Group.

Performance and comparisons

Under ideal radio conditions, HSPA+ peak downlink rates with MIMO and 64QAM could approach several tens of megabits per second per carrier, while aggregated dual-carrier configurations increased potential throughput. Latency reductions relative to earlier HSDPA improved web browsing and streaming performance for applications provided by firms such as Netflix, YouTube, and Spotify. In head-to-head comparisons, HSPA+ provided lower capital cost upgrades compared with early LTE rollouts by Verizon Communications and AT&T Inc., but LTE offered superior spectral efficiency and greater capacity scalability as demonstrated in trials by NTT DoCoMo and KT Corporation. Performance varied with spectrum holdings, cell site density, backhaul quality provided by vendors like Cisco Systems and Juniper Networks, and handset support from manufacturers including Apple Inc. and Samsung.

Variants and marketing names

Operators and vendors adopted several commercial labels and feature subsets to market HSPA+ capabilities. Examples include "Evolved HSPA", "Turbo 3G", "H+," and other service names used by carriers such as T-Mobile US, Vodafone, Three, Claro, and Telefónica. Device manufacturers often listed chipset support under product names engineered by Qualcomm and Broadcom, while vendors like Ericsson and Huawei marketed firmware-enabled enhancements as part of portfolio offerings to large customers including Deutsche Telekom and BT Group.

Regulatory and spectrum considerations

Deployment of HSPA+ depended on national spectrum policies administered by agencies such as the Federal Communications Commission, Ofcom, ANATEL, and Australian Communications and Media Authority. Spectrum bands commonly repurposed for HSPA+ deployments included 850 MHz, 900 MHz, 1700 MHz, 1900 MHz, and 2100 MHz—licenses held by operators like AT&T, Vodafone Group, China Mobile, and Bharti Airtel. Regulatory frameworks addressing refarming, cross-border coordination with regulators like International Telecommunication Union offices, and auction outcomes involving companies such as Telefonica and SoftBank Group shaped how quickly HSPA+ could be rolled out and how operators balanced investment between legacy UMTS and next-generation LTE technologies.

Category:Mobile telecommunications standards