Impairment determination for a diversity antenna selection process
First Claim
1. A diversity selection process for a transceiver with at least two antennas, wherein said transceiver communicates using transmissions which comprise frames, the process comprising, for a given frame:
- a) selecting one of said at least two antennas as a current antenna based on a best antenna determination made prior to the given frame;
b) evaluating whether a quality indication of a signal received on the current antenna satisfies a first condition;
c) responsive to said quality indication satisfying said first condition, determining which of the at least two antennas has the greater Received Signal Strength lndication (RSSI), and selecting this antenna as the best antenna for a subsequent frame provided a hold condition does not exist;
d) responsive to said quality indication not satisfying said first condition;
i) evaluating whether the signal received on an other antenna satisfies a second condition;
ii) responsive to said other antenna signal satisfying said second condition;
A) selecting said other antenna as the best antenna for a subsequent frame; and
B) evaluating whether the received signal strength of the signal received on the current antenna exceeds a threshold, and setting a hold condition for a specified number of frames in the event said threshold was exceeded.
7 Assignments
0 Petitions
Accused Products
Abstract
A diversity selection process which tests to determine whether poor reception is caused by co-channel interference or multipath fading is disclosed. The impairment is determined by first testing the quality over several frames. Unless the quality is poor over these several frames, the system tests for multipath fading by selecting the antenna with the greater signal strength, provided no hold condition exists. However, if poor quality has been present over the several frame period, the system selects the other antenna if its RSSI is greater. However, the system also tests the RSSI received on the current antenna and determines the impairment was co-channel interference if the signal of quality was sufficiently high. In which case a hold condition is set for a number of frames to prevent excessive switching.
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Citations
27 Claims
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1. A diversity selection process for a transceiver with at least two antennas, wherein said transceiver communicates using transmissions which comprise frames, the process comprising, for a given frame:
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a) selecting one of said at least two antennas as a current antenna based on a best antenna determination made prior to the given frame; b) evaluating whether a quality indication of a signal received on the current antenna satisfies a first condition; c) responsive to said quality indication satisfying said first condition, determining which of the at least two antennas has the greater Received Signal Strength lndication (RSSI), and selecting this antenna as the best antenna for a subsequent frame provided a hold condition does not exist; d) responsive to said quality indication not satisfying said first condition; i) evaluating whether the signal received on an other antenna satisfies a second condition; ii) responsive to said other antenna signal satisfying said second condition; A) selecting said other antenna as the best antenna for a subsequent frame; and B) evaluating whether the received signal strength of the signal received on the current antenna exceeds a threshold, and setting a hold condition for a specified number of frames in the event said threshold was exceeded. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A diversity antenna selection method for a terminal having at least two antennas operating in a wireless communication system comprising, for a given frame:
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a) selecting one of said at least two antennas as a current antenna based on a best antenna determination made prior to the given frame and receiving a signal on said current antenna during a receive timeslot associated with a current channel; b) testing reception of a different channel received by said terminal; c) testing reception of the current channel received by said current antenna; d) testing reception of the current channel received by an alternative antenna; and e) selecting a best antenna for a subsequent frame as the antenna with the best test results, wherein step (e) comprises; 1) evaluating whether a quality indication of a signal received on the current antenna satisfies a first condition; 2) responsive to said quality indication satisfying said first condition, determining which of the at least two antennas has the greater Received Signal Strength Indication (RSSI), and selecting this antenna as the best antenna for a subsequent frame provided a hold condition does not exist; 3) responsive to said quality indication not satisfying said first condition; i) evaluating whether the signal received on an other antenna satisfies a second condition; ii) responsive to said other antenna signal satisfying said second condition; A) selecting said other antenna as the best antenna for a subsequent frame; and B) evaluating whether the received signal strength of the signal received on the current antenna exceeds a threshold, and setting a hold condition for a specified number of frames in the event said threshold was exceeded.
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10. A diversity selection process for a transceiver with at least two antennas, wherein said transceiver communicates using transmissions which comprise frames, the process comprising the steps of:
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i) determining a received signal strength indication (RSSI) received by each antenna; ii) determining an indication as to the quality of the signal on a current antenna wherein said current antenna is selected from said at least two antennas; iii) evaluating whether the quality of the signal received on the current antenna has been sufficient for a specified period; iv) responsive to said evaluating step determining the quality has not been sufficient over said period, evaluating whether the signal received by another antenna satisfies a condition; v) responsive to the signal received by said other antenna satisfying said condition; a) selecting the other antenna as the current antenna during a subsequent frame; and b) responsive to the received signal strength of the signal received by the current antenna having exceeded a specified threshold, establishing a hold on subsequent switching for a specified number of frames. - View Dependent Claims (11, 12)
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13. A wireless terminal comprising:
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a receiver for receiving transmissions which compose frames; a first antenna; at least one alternative antenna; a switch for selecting which antenna provides input signal to said receiver; and a controller for controlling said switch according to instructions stored in memory, said instructions when executed, causing said terminal to carryout a process comprising, for a given frame; a) selecting one of said at least two antennas as a current antenna based on a best antenna determination made prior to the given frame; b) evaluating whether a quality indication of a signal received on the current antenna satisfies a first condition; c) responsive to said quality indication satisfying said first condition, determining which of the at least two antennas has the greater Received Signal Strength Indication (RSSI), and selecting this antenna as the best antenna for a subsequent frame provided a hold condition does not exit; d) responsive to said quality indication not satisfying said first condition; i) evaluating whether the signal received on an other antenna satisfies a second condition; ii) responsive to said other antenna signal satisfying said second condition; A) selecting said other antenna as the best antenna for a subsequent frame; and B) evaluating whether the received signal strength of the signal received on the current antenna exceeds a threshold, and setting a hold condition for a specified number of frames in the event said threshold was exceeded. - View Dependent Claims (22, 23, 24, 25, 26, 27)
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14. A wireless terminal comprising:
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a receiver for receiving transmissions which comprise frames; a first antenna; at least one alternative antenna; a switch for selecting which antenna provides input signal to said receiver; and a controller for controlling said switch according to instructions stored in memory, said instructions, when executed, causing said terminal to carryout a process comprising, for a given frame; a) selecting one of said at least two antennas as a current antenna based on a best antenna determination made prior to the given frame and receiving a signal on said current antenna during a receive timeslot associated with a current channel; b) testing reception of a different channel received by said terminal; c) testing reception of the current channel received by said current antenna; d) testing reception of the current channel received by an alternative antenna; and e) selecting a best antenna for a subsequent frame as the antenna with the best test results, wherein step (e comprises; 1) evaluating whether a quality indication of a signal received on the current antenna satisfies a first condition; 2) responsive to said quality indication satisfying said first condition, determining which of the at least two antennas has the greater Received Signal Strength Indication (RSSI), and selecting this antenna as the best antenna for a subsequent frame Provided a hold condition does not exist; 3) responsive to said quality indication not satisfying said first condition; i) evaluating whether the signal received on an other antenna satisfies a second condition; ii) responsive to said other antenna signal satisfying said second condition; A) selecting said other antenna as the best antenna for a subsequent frame; and B) evaluating whether the received signal strength of the signal received on the current antenna exceeds a threshold, and setting a hold condition for a specified number of frames in the event said threshold was exceeded.
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15. A wireless terminal comprising:
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a transceiver for receiving transmissions which comprise frames; a first antenna; at least one alternative antenna; a switch for selecting which antenna provides input signal to said receiver; and a controller for controlling said switch according to instructions stored in memory said instructions, when executed, causing said terminal to carryout a process comprising, for a given frame; i) determining the received signal strength indication (RSSI) received by each antenna; ii) determining an indication as to the quality of the signal on the current antenna; iii) evaluating whether the quality of the signal received on the current antenna has been sufficient for a specified period; iv) responsive to said evaluating step determining the quality has not been sufficient over said period, evaluating whether the signal received by said other antenna satisfies a condition; v) responsive to the signal received by said other antenna satisfying said condition; a) selecting the other antenna as the current antenna for reception during a subsequent frame; and b) responsive to the received-signal strength of the signal received by the current antenna having exceeded a specified threshold, establishing a hold on subsequent switching for a specified number of frames; and vi) responsive to said evaluating step determining the quality has been sufficient for the specified period, selecting the antenna with the Greater RSSI as the current antenna for a subsequent frame provided no hold has been set; wherein the step of determining the received signal strength indication (RSSI) received by each antenna comprises measuring the RSSI of the current channel received on one antenna, then measuring the RSSI of the current channel received on the other antenna, wherein both of said measuring steps occur when said transceiver is either idle or transmitting and wherein said method further comprises the step of tuning the transceiver to another channel and testing the reception on said other channel when said transceiver is not transmitting.
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16. A wireless terminal which communicates using transmissions which comprise frames, said terminal comprising:
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a receiver; a first antenna; at least one alternative antenna; a switch for selecting which antenna provides an input signal to said receiver; means for selecting a previously determined best antenna as a current antenna selected by said switch; means for evaluating whether a quality indication of the signal received on the current antenna satisfies a first condition; first means, responsive to said quality satisfying said first condition, for determining the antenna with the greater Received Strength Signal Indication (RSSI) and selecting this antenna as the best antenna for the next frame provided no previously set hold condition continues to exist; and second means, responsive to said quality not satisfying said first condition, for; i) evaluating whether the signal received on an other antenna satisfies a second condition; ii) responsive to said other antenna signal satisfying said second condition; A) selecting said other antenna as the best antenna for a subsequent timeslot of interest; and B) evaluating whether the received signal strength of the signal received on the current antenna exceeds a threshold, and setting a hold condition for a specified number of frames in the event said threshold was exceeded. - View Dependent Claims (17, 18, 19)
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20. A wireless terminal comprising.
a transceiver system; at least two antennas; i) means for determining the received signal strength indication (RSSI) received by each antenna; ii) means for determining an indication as to the quality of the signal on a current antenna; iii) means for evaluating whether the quality of the signal received on the current antenna has been sufficient for a specified period; iv) means, responsive to said means for evaluating determining the quality has not been sufficient over said period, for evaluating whether the signal received by an other antenna satisfies a condition; v) means, responsive to the signal received by said other antenna satisfying said condition, for; a) selecting the other antenna as the current antenna for reception during a subsequent frame; and b) responsive to the received signal strength of the signal received by the current antenna having exceeded a specified threshold, establishing a hold on subsequent switching for a specified number of frames. - View Dependent Claims (21)
Specification