{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

pre-lecture notes 1-20

pre-lecture notes 1-20 - Simple LTE summary Part of the LTE...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Simple LTE summary: Part of the LTE standard is an IP based network architecture designed to replace the GPRS core network and ensure support for, and mobility between, some legacy or non-3GPP systems, such as WiMAX. The LTE specification provides downlink peak rates of at least 100 Mbps, an uplink of at least 50 Mbps and latency times less than 10ms. LTE supports scalable frequency bandwidths from 1.25 MHz to 20 MHz : 1.25, 2.5, 5, 10, 15, and 20MHz; and supports both (FDD) and (TDD). First-release LTE does not fully comply with the 4G requirements. LTE Advanced is certified 4G and is backwards compatible with LTE and uses the same frequency bands, while LTE is not backwards compatible with 3G systems. MetroPCS , Verizon Wireless and AT&T Mobility in the United States and several worldwide carriers announced plans, beginning in 2009, to convert their networks to LTE. (see previous lecture notes for more complete and more modern details) 3G to 3.9G evolution:
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
OFDMA in the downlink and SC-FDMA in the uplink Uplink modulation schemes: QPSK, 16QAM, 64QAM Broadcast channel only uses QPSK Up to 200 users in every 5 MHz (i.e., can support 200 data users) Quote: “The standard includes: Peak download rates of 326.4 Mbit/s for 4x4 antennae, and 172.8 Mbit/s for 2x2 antennae (utilizing 20 MHz of spectrum). [10] Note : If we knew what G.I. used, then could figure if that’s 4X4;4 or not. Peak upload rates of 86.4 Mbit/s for every 20 MHz of spectrum using a single antenna. [10] Five different terminal classes have been defined from a voice centric class up to a high end terminal that supports the peak data rates. All terminals will be able to process 20 MHz bandwidth. At least 200 active users in every 5 MHz cell. (Specifically, 200 active data clients) Sub-5 ms latency for small IP packets Increased spectrum flexibility, with supported spectrum slices as small as 1.4 MHz and as
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}