Browse Prior Art Database

WCDMA NETWORK WIRELESS EXTENSION

IP.com Disclosure Number: IPCOM000131997D
Original Publication Date: 2005-Nov-28
Included in the Prior Art Database: 2005-Nov-28
Document File: 4 page(s) / 59K

Publishing Venue

Motorola

Related People

Yonghong Chang: AUTHOR

Abstract

ABSTRACT: This paper introduces a new method of wirelessly extending WCDMA Radio Access Network by using HSDPA and Enhanced Uplink wideband connections. The key principle is to introduce a new network element, “Mobile Node B”, with the functionality of a UE and a Node B integrated organically, to communicate with its parent Node B in one direction and to communicate with the real UEs in the other direction. The coverage of WCDMA RAN is wirelessly extended this way, and it can be used in some emergency communication scenarios or some places where wiring is difficult. From the standards point of view, a minor change in 3GPP RRC protocol would enable this extension.

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WCDMA NETWORK WIRELESS EXTENSION

Yonghong Chang Motorola Inc.

ABSTRACT: This paper introduces a new method of wirelessly extending WCDMA Radio Access Network by using HSDPA and Enhanced Uplink wideband connections. The key principle is to introduce a new network element, "Mobile Node B", with the functionality of a UE and a Node B integrated organically, to communicate with its parent Node B in one direction and to communicate with the real UEs in the other direction. The coverage of WCDMA RAN is wirelessly extended this way, and it can be used in some emergency communication scenarios or some places where wiring is difficult. From the standards point of view, a minor change in 3GPP RRC protocol would enable this extension.

KEY WORDS: UMTS, Wireless Extension, HSDPA, Enhanced Uplink, Mobile Node B

1. BACKGROUNDS

The traditional structure of UMTS Terrestrial Radio Access Network (UTRAN) is shown in figure 1. The UTRAN is divided into different Radio Network Subsystem (RNS), each RNS has one RNC and multiple Node Bs. The RNC manages all the radio and terrestrial resources in an RNS, and the Node Bs are responsible for base-band signal processing and Radio Frequency transmission/reception, plus System information broadcasting and HARQ scheduling for HSDPA/Enhanced Uplink.

Figure 1. Traditional UTRAN structure

The protocol stack structure of the Iub interface is shown in figure 2. Currently UTRAN uses ATM or IP as transport bearer between Node B and RNC, i.e., the Iub interface between them is connected with fiber optical links or co-axal cables. This means that wiring is a must for communication between Node B and RNC. Radio Network Layer (RNL) signaling and traffic are transported over the ATM/IP layer.

© 2005 Motorola, Inc.

Core Network

Iu Iu

UTRAN

RNS

RNS

Iur

         Iub Iub Iub Iub

RNC

RNC

Node B

Node B

Node B

Node B

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Radio Network Layer NBAP/Iub FP

Transport Network Layer ATM/IP

E1/SDH

Figure 2. Iub Interface vertical structure

However, wiring is not always feasible or easy in some occasions, such as on some small islands, isolated areas by earthquakes, temporary wireless communications needs for sports games like Marathon. These create the needs for wireless connection between Node B and RNC. Currently there have already been some solutions for this, such as satellite link and Wireless LAN IP transport, they have a common characteristic: they are using a different technology other than WCDMA itself as transport bearer, extra efforts must be spent to develop such transport bearers in the equipments.

2. PRINCIPLES OF WIRELESS EXTENSION

Making use of the theory of self-organized networks, the author would design a new type of network element, "Mobile Node B", as shown in figure 3. An end of this device can be a mobile (UE), it registers to the network and establish a HSDPA+EUL (Enhanced Uplink) connection; the other end of this device can act as a Base Station (Node B) t...