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UPLINK PACKET ACCESS LINK USING SWEEPING ANTENNA BEAMS

IP.com Disclosure Number: IPCOM000008811D
Original Publication Date: 1998-Sep-01
Included in the Prior Art Database: 2002-Jul-16
Document File: 2 page(s) / 88K

Publishing Venue

Motorola

Related People

René Pihl Jepsen: AUTHOR [+5]

Abstract

A very important issue for the European third gen- eration mobile cellular communication system UMTS is the provision of packet services on the air interface. This is typically envisaged as a bit pipe between the mobiles and a specific basestation. Any mobile can at any given time access the bit pipe taking up the resource and preventing other mobiles from accessing.

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MOTOROLA Technical Developments

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UPLINK PACKET ACCESS LINK USING SWEEPING ANTENNA BEAMS

by Rend Pihl Jepsen, Rorie O'Neill, Jun Xiang, Ted Hatala, Behzad Mohebbi BACKGROUND AND DESCRIPTION

  A very important issue for the European third gen- eration mobile cellular communication system UMTS is the provision of packet services on the air interface. This is typically envisaged as a bit pipe between the mobiles and a specific basestation. Any mobile can at any given time access the bit pipe taking up the resource and preventing other mobiles from accessing.

  Another significant issue for UMTS is the use of adaptive antennas. However, in combination with packet access on the air interface a fundamental prob- lem is that the basestation is not aware of where the mobile is until it has established the link. It therefore cannot form a highly directional beam until this link is established. One solution to the problem is to use omnidirectional beam forming until a mobile has been detected, followed by beam forming optimizing the reception in the direction of the mobile. The disadvan- tage of this approach is that the system must function adequately with the original omnidirectional beam- forming, and it cannot take advantage of the high antenna gain resulting from a highly directional beam.

  In this disclosure, it is suggested to use continuous directional beamforming and sweeping this beam to ensure coverage of the entire cell area (see Figure 1). This approach will allow range extension due to the increased antenna gain and reduced uplink interference.

  The principle of the idea is as follows. The base- station forms two highly directional beams which ;are swept 360 degrees. One beam is...