Method and apparatus for performing handoff between sectors of a common base station

• US 5,933,787 A
• Filed: 12/11/1996
• Issued: 08/03/1999
• Est. Priority Date: 03/13/1995
• Status: Expired due to Term

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Gilhousen, Klein S., Padovani, Roberto, Weaver, Lindsay A. Jr.
• Primary Examiner(s): Chin, Wellington
• Assistant Examiner(s): Nguyen, Lee
• Application Number:
  US08/763,498
• Time in Patent Office: 965 Days
• Field of Search: 455/33.3, 455/33.1, 455/33.2, 455/33.4, 455/56.1, 455/101-105, 455/132-135, 455/137, 455/140, 455/69, 455/70, 455/438, 455/439, 455/442, 455/444, 455/447 , 455/277.1, 455/272, 455/273, 455/277.2, 379/59, 379/60, 375/347, 375/349
• US Class Current: 455/438
• CPC Class Codes: H04B 7/0491 using two or more sectors, i.e. sector diversity
• CPC Class Codes: H04W 16/24 Cell structures
• CPC Class Codes: H04W 36/00692 using simultaneous multiple data streams, e.g. cooperative multipoint [CoMP], carrier aggregation [CA] or multiple input multiple output [MIMO] allocation of physical resources in CoMP or in CA H04L5/0035
• CPC Class Codes: H04W 52/40 during macro-diversity or soft handoff

Abstract

A method and apparatus providing softer handoff of a mobile unit between sectors of a common base station. A sectorized base station comprises a set of demodulation elements. Each demodulation element may be assigned to a signal from one of a plurality of sectors. The output of the demodulators are combined before the decoding process independent of the sector from which the data originated. This configuration provides improved output data reliability, more stable power control, and more efficient use of resources at the base station.

Claims

1. A base station having a base station transceiver system for receiving at least two reverse link radio frequency signals transmitted across a single frequency band by a mobile unit located within a cell associated with said base station, the mobile unit simultaneously transmitting the reverse link radio frequency signals to at least first and second sectors within the base station during a handoff between said first and second sectors, said base station transceiver system comprising:

first and second receive processing systems, said first and second receive processing systems each simultaneously receiving one of said at least two reverse link signals from said mobile unit, said first receive processing system being assigned to said first sector of said base station, said second receive processing system being assigned to said second sector of said base station;

an interface port that selectively couples each of said first and second receive processing systems to one of first and second demodulation elements during said handoff, each of said demodulation elements being capable of simultaneously demodulating a processed signal received from either of said first and second receive processing systems during said handoff; and

a combiner for combining each demodulated signal from said first and second demodulation elements to create a summed demodulated signal during said handoff.

2. The base station transceiver system of claim 1 further comprising:

a decoder for decoding said summed demodulated signal.

3. A base station having a base station transceiver system for receiving at least two reverse link radio frequency signals transmitted across a single frequency band by a mobile unit located within a cell associated with said base station, the mobile unit simultaneously transmitting the reverse link radio frequency signals to at least first and second sectors within the base station between said first and second sectors, said base station transceiver system comprising:

first and second receive processing systems, said first and second receive processing systems each simultaneously receiving one of said at least two reverse link signals from said mobile unit, said first receive processing system being assigned to said first sector of said base station, said second receive processing system being assigned to said second sector of said base station;

an interface port that selectively couples each of said first and second receive processing systems to one of first and second demodulation elements, each of said demodulation elements being capable of simultaneously demodulating a processed signal received from either of said first and second receive processing systems; and

a combiner for combining each demodulated signal from said first and second demodulation elements to create a summed demodulated signal.