Method and apparatus for performing handoff between sectors of a common base station
First Claim
Patent Images
1. A base station transceiver system for interfacing with a mobile unit via an upconverted radio frequency signal comprising:
- a first radio frequency processing system for down converting said upconverted radio frequency signal to a first baseband signal;
a second radio frequency processing system for down converting said upconverted radio frequency signal to a second baseband signal;
a first demodulation element for converting said first baseband signal to a first set of estimation data respectively;
a second demodulation element for converting said second baseband signal to a second set of estimation data;
a combiner for combining said first set of estimation data and said second set of estimation data to form a single set of estimation data;
a decoder for converting said single set of estimation data to digital data;
a control system for generating control information in response to said first and second sets of estimation data; and
an interface port for transmitting said first baseband signal and said second baseband signal to said first and second demodulation element in accordance with said control information.
0 Assignments
0 Petitions
Accused Products
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.
318 Citations
14 Claims
-
1. A base station transceiver system for interfacing with a mobile unit via an upconverted radio frequency signal comprising:
-
a first radio frequency processing system for down converting said upconverted radio frequency signal to a first baseband signal; a second radio frequency processing system for down converting said upconverted radio frequency signal to a second baseband signal; a first demodulation element for converting said first baseband signal to a first set of estimation data respectively; a second demodulation element for converting said second baseband signal to a second set of estimation data; a combiner for combining said first set of estimation data and said second set of estimation data to form a single set of estimation data; a decoder for converting said single set of estimation data to digital data; a control system for generating control information in response to said first and second sets of estimation data; and an interface port for transmitting said first baseband signal and said second baseband signal to said first and second demodulation element in accordance with said control information. - View Dependent Claims (2, 3, 4, 5)
-
-
6. A cellular telephone system comprising:
-
a mobile unit for generating a reverse link signal and receiving a forward link signal; a first set of mobile units for generating a first set of other reverse link signals; a second set of mobile units for generating a second set of other reverse link signals; a first base station transceiver system having a first radio frequency signal processing system for receiving a first instance of said reverse link signal, a second radio frequency processing system for receiving a second instance of said reverse link signal, and a signal processing system for combining said first and second instances to generate a first digital signal; a second base station transceiver system for receiving a third instance of said reverse link signal and for generating a second digital signal in response; a base station controller system combining said first digital signal and said second digital signal into a third digital signal, wherein said first instance is received along with said first set of other reverse link signals, and said second instance is received along with said second set of other reverse link signals. - View Dependent Claims (7, 8)
-
-
9. A base station transceiver system for receiving a reverse link radio frequency signal comprising:
-
a first demodulation element for converting said reverse link radio frequency signal to a first demodulated signal; a second demodulation element for converting said reverse link radio frequency signal to a second demodulated signal; a combiner for combining said first and second demodulated signals to produce a third demodulated signal; a decoder for converting said third demodulated signal to digital data; a first receive processing system for receiving said reverse link radio frequency signal in conjunction with a first set of other reverse link radio frequency signals, and for providing said reverse link radio frequency signal and said first set of other reverse link radio frequency signals to said first demodulation element; and a second receive processing system for receiving said reverse link radio frequency signal conjunction with a second set of other reverse link radio frequency signals, and for providing said reverse link radio frequency signal and said second set of other reverse link radio frequency signals to said second demodulation element. - View Dependent Claims (10, 11)
-
-
12. A base station transceiver system for receiving a reverse link radio frequency signal comprising:
-
a first demodulation element for converting said reverse link radio frequency signal to a first demodulated signal; a second demodulation element for converting said reverse link radio frequency signal to a second demodulated signal; a combiner for combining said first and second demodulated signals to produce a third demodulated signal; and a decoder for converting said third demodulated signal to digital data; a control system for generating a first set of power control commands directed to said mobile unit and a second set of power control commands directed to other mobile units; a first transmit processing unit for transmitting said first set of power control commands along with a first sub-set of said second set of power control commands; and a second power transmit processing unit for transmitting said first set of power control commands along with a second sub-set of said second set of power control commands. - View Dependent Claims (13, 14)
-
Specification