【資料名稱】：UMTS Long Term Evolution (LTE)

【資料作者】：XXX

【資料日期】：2012-04-12

【資料語言】：英文

【資料格式】：PDF

【資料目錄和簡介】：

Currently, UMTS networks worldwide are being upgraded to High Speed
Packet Access (HSPA) in order to increase data rate and capacity for
packet data. HSPA refers to the combination of High Speed Downlink
Packet Access (HSDPA) and High Speed Uplink Packet Access (HSUPA).
While HSDPA was introduced as a 3GPP release 5 feature, HSUPA is an
important feature of 3GPP release 6.
However, even with the introduction of HSPA, evolution of UMTS has not
reached its end. HSPA+ will bring significant enhancements in 3GPP
release 7 and 8. Objective is to enhance performance of HSPA based radio
networks in terms of spectrum efficiency, peak data rate and latency, and
exploit the full potential of WCDMA based 5 MHz operation. Important
features of HSPA+ are downlink MIMO (Multiple Input Multiple Output),
higher order modulation for uplink and downlink, improvements of layer 2
protocols, and continuous packet connectivity.