Antenna diversity in a wireless local area network
First Claim
1. A method of selecting an antenna in an antenna diversity system, comprising a station having at least two antennas making received signal quality measurements for at least one of said at least two antennas during at least a portion of a time division time frame in which downlink signals are addressed specifically to another station and selecting one of the said at least two antennas providing the best (or better) quality of signal reception for use.
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Accused Products
Abstract
A method whereby a mobile terminal (MT) operating in a wireless local area network (WLAN), for example HiperLAN2, can effect antenna diversity. The mobile terminal which has at least two antennas (24, 26) monitors downlink fields in successive time frames in a time division radio transmission for indications of when downlink message signals are to be sent to mobile terminals other than the one effecting the monitoring and determines from the indications when there will be in the time frame a time period of sufficient duration for the mobile terminal to effect antenna diversity measurements. The mobile terminal measures in the selected time period the quality of signal reception by each of the at least two antennas and selects the one of the said at least two antennas providing the better (or best) quality of signal reception.
76 Citations
9 Claims
- 1. A method of selecting an antenna in an antenna diversity system, comprising a station having at least two antennas making received signal quality measurements for at least one of said at least two antennas during at least a portion of a time division time frame in which downlink signals are addressed specifically to another station and selecting one of the said at least two antennas providing the best (or better) quality of signal reception for use.
- 6. A wireless local area network comprising a primary station having transceiving means for transmitting signals on downlink and receiving signals on an uplink and at least one secondary station having transceiving means for receiving downlink signals and for transmitting uplink signals, the downlink and uplink signals being transmitted in accordance with a time division protocol comprising successive time frames, the at least one secondary station having at least two antennas and means for selecting one of said at least two antennas in response to antenna diversity measurements made during at least a portion of a time division time frame in which downlink signals are not addressed specifically to the secondary station.
- 8. A secondary station for use in a wireless local area network comprising a primary station having transceiving means for transmitting signals on a downlink and receiving signals on an uplink, the secondary station including transceiving means for receiving downlink signals from the primary station and for transmitting uplink signals, the downlink and uplink signals being transmitted in accordance with a time division protocol comprising successive time frames, the secondary station further comprising at least two antennas and means for selecting one of said at least two antennas in response to antenna diversity measurements made during at least a portion of a time division time frame in which downlink signals are not addressed specifically to the secondary station.
Specification