7090621-WCDMA-RAN-Basic-Concepts

7090621-WCDMA-RAN-Basic-Concepts - white paper Basic...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
white paper Basic Concepts of WCDMA Radio Access Network
Background image of page 1

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

View Full DocumentRight Arrow Icon
white paper 2 Table of contents 1 Background 3 2 2 WCDMA a development from GSM and CDMA 4 2.1 Code Division Multiple Access and WCDMA 4 3 Radio Network Functionality 4 3.1 Power control 5 3.2 Soft and softer handover 5 3.3 Handover to GSM (inter-system handover) 6 3.4 Inter-frequency handover (intra-system handover) 6 3.5 Channel type switching 6 3.6 Admission control 6 3.7 Congestion control 6 3.8 Synchronization 7 4 Basic architecture concepts /System overview 7 4.1 Radio Access Network (RAN) Architecture 7 4.2 Transport in WCDMA Radio Access Network 8 4.3 Radio Interface Overview 8 5 Abbreviations 9
Background image of page 2
3 white paper 1 Background There has been a tremendous growth in wireless communication technology over the past decade. The significant increase in subscribers and traffic, new bandwidth consuming applications such as gaming, music down loading and video streaming will place new demands on capacity. The answer to the capacity demand is the provision of new spectrum and the development of a new technology – Wideband CDMA or hereinafter referred to as WCDMA. WCDMA was developed in order to create a global standard for real time multimedia services that ensured international roaming. With the support of ITU (International Telecommunication Union) a specific spectrum was allocated – 2GHz for 3G telecom systems. The work was later taken over by the 3GPP (3rd Generation Partnership Project), which is now the WCDMA specification body with delegates from all over the world. Ericsson has for a long time played a very active role in both ITU and 3GPP and is a major contributor to WCDMA and the fulfillment of the vision of a global mobile telecommunication system.
Background image of page 3

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

View Full DocumentRight Arrow Icon
white paper 4 2 WCDMA a development from GSM and CDMA Naturally there are a lot of differences between WCDMA and GSM systems, but there are many simi- larities as well. The GSM Base Station Subsystem (BSS) and the WCDMA Radio Access Network (RAN) are both connected to the GSM core network for providing a radio connection to the handset. Hence, the techno- logies can share the same core network. Furthermore, both GSM BSS and WCDMA RAN systems are based on the principles of a cellular radio system. The GSM Base Station Controller (BSC) corre- sponds to the WCDMA Radio Network Controller (RNC). The GSM Radio Base Station (RBS) corre- sponds to the WCDMA RBS, and the A-interface of GSM was the basis of the development of the Iu-inter- face of WCDMA, which mainly differs in the inclusion of the new services offered by WCDMA. The significant differences, apart from the lack of interface between the GSM BSCs and an insufficiently specified GSM Abis-interface to provide multi-vendor operability, are more of a systemic matter. The GSM system uses TDMA (Time Division Multiple Access) technology with a lot of radio functionality based on managing the timeslots. The WCDMA system on the other hand uses CDMA, as described below, which means that both the hardware and the control func-
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 02/16/2011 for the course COMP 211 taught by Professor Comp during the Spring '11 term at Naval Academy.

Page1 / 10

7090621-WCDMA-RAN-Basic-Concepts - white paper Basic...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online