TAILIEUCHUNG - Ebook 3G Evolution: HSPA and LTE for mobile broadband: Part 2

(BQ) Part 2 book "3G Evolution: HSPA and LTE for mobile broadband" has contents: Enhanced uplink, MBMS - multimedia broadcast multicast services, HSPA evolution, LTE and SAE - introduction and design targets, LTE radio access - An overview. and other contents. | 10 Enhanced Uplink Enhanced Uplink, also known as High-Speed Uplink Packet Access (HSUPA), has been introduced in WCDMA Release 6. It provides improvements in WCDMA uplink capabilities and performance in terms of higher data rates, reduced latency, and improved system capacity, and is therefore a natural complement to HSDPA. Together, the two are commonly referred to as High-Speed Packet Access (HSPA). The specifications of Enhanced Uplink can be found in [101] and the references therein. Overview At the core of Enhanced Uplink are two basic technologies used also for HSDPA – fast scheduling and fast hybrid ARQ with soft combining. For similar reasons as for HSDPA, Enhanced Uplink also introduces a short 2 ms uplink TTI. These enhancements are implemented in WCDMA through a new transport channel, the Enhanced Dedicated Channel (E-DCH). Although the same technologies are used both for HSDPA and Enhanced Uplink, there are fundamental differences between them, which has affected the detailed implementation of the features: • In the downlink, the shared resource is transmission power and the code space, both of which are located in one central node, the NodeB. In the uplink, the shared resource is the amount of allowed uplink interference, which depends on the transmission power of multiple distributed nodes, the UEs. • The scheduler and the transmission buffers are located in the same node in the downlink, while in the uplink the scheduler is located in the NodeB while the data buffers are distributed in the UEs. Hence, the UEs need to signal buffer status information to the scheduler. • The WCDMA uplink, also with Enhanced Uplink, is inherently non-orthogonal, and subject to interference between uplink transmissions within the same cell. 185 3G Evolution: HSPA and LTE for Mobile Broadband 186 This is in contrast to the downlink, where different transmitted channels are orthogonal. Fast power control is therefore essential for the uplink to handle the .

• Kĩ thuật Viễn thông
• 3G Evolution
• Enhanced uplink
• Multimedia broadcast multicast services
• Design targets
• LTE radio access
• LTE radio interface architecture
• Background of 3G evolution
• HSPA and LTE for mobile broadband
• High data rates in mobile communication
• Multi antenna techniques
• High Speed downlink packet access
• IP Ran
• Mobile network evolution
• Introduction of IP
• 3G WCDMA RAN
• Technology trend
• 3G HSPA deployment
• cellular communications
• evolution of GSM and cdmaOne to 3G Sytems
• totally digital
• cellular radio
• cellular systemthat
• public mobile
• Technology advancements
• Evolved core network
• Radio Access Network
• Mobile communication
• OFDM demodulation