LTE (Long Term Evolution) is a 4th-generation wireless standard. The 3GPP Release 8 specification outlines the features and requirements.
Key features include:
• Peak data rate:
·100 Mbps DL within 20 MHz bandwidth. (Peak DL data rate in 10 MHz bandwidth: 70 Mbps (approx.) for Cat 3 device)
·50 Mbps UL within 20 MHz bandwidth. Actual throughput is dependent on the network configuration, bandwidth assigned to the UE, the number of users, and RF signal conditions.
• Up to 200 active users in a cell (5 MHz)
• Less than 5 ms user-plane latency
• Supported bandwidths: 5 MHz / 10 MHz / 20 MHz
• Spectrum flexibility: 1.4–20 MHz (3–20 MHz in future F/W release)
• Enhanced support for end-to-end QOS
• Physical layer uses:
·DL: OFDMA (Orthogonal Frequency Division Multiple Access). Modulation: QPSK, 16QAM, and 64QAM
·UL: Single Carrier FDMA (single carrier modulation and orthogonal frequency multiplexing). Modulation: QPSK, 16QAM
•MIMO (Multi-Input Multi-Output) antenna support
The Universal Mobile Telecommunications System (UMTS) specification is the 3G mobile systems standard based on an evolution of GSM core network components. High-speed 3G systems implementing the UMTS standard enable improved performance for wireless data applications, delivery of enhanced multimedia content, and improved network capacity to support additional subscribers.
HSPA is a third generation (3G) evolution of WCDMA that combines two extensions to UMTS — HSDPA (High Speed Downlink Packet Access) and HSUPA (High Speed Uplink Packet Access).
HSPA+ is an enhanced version of HSPA (High Speed Packet Access), as defined by the 3rd Generation Partnership Project (3GPP) Release 7 UMTS Specification for Mobile Terminated Equipment. Using improved modulation schemes and refined data communication protocols, HSPA+ permits increased uplink and downlink data rates.
Dual-Carrier HSPA+ is an enhanced version of HSPA+, as defined by the 3GPP Release 8 UMTS Specification for Mobile Terminated Equipment. DC-HSPA+ uses paired spectrum allocations to double the bandwidth available and, therefore, double downlink data rates.
GSM / GPRS / EDGE
GPRS and EDGE are 2G wireless technologies providing end-to-end packet data services through reuse of existing GSM infrastructure. GPRS / EDGE packet data rates are determined by the number of timeslots available for downlink (Rx) and uplink (Tx), and the coding scheme used for any given transmission.