Back-end alignment to avoid SDMA ACK time-out
First Claim
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1. An apparatus, comprising:
- a first electronic device adapted to compare a first indicator of a predicted duration of a first transmission to a second electronic device with a second indicator of a predicted duration of a second transmission to a third electronic device;
adjust starting times of at least one of the first and second transmissions to cause the first and second transmissions to end at approximately a same time; and
transmit the first and second transmissions using the adjusted starting times.
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Abstract
In a base station using spatial division multiple access communications, different length transmissions directed from a base station to different multiple mobile devices substantially simultaneously may have their start times adjusted so that the transmissions end at approximately the same time. The mobile devices may then respond during a response period with acknowledgments at approximately the same time. Thus all the acknowledgments may be received within the same time period from the end of the transmissions, reducing the likelihood of missed acknowledgments in responses to the shorter transmissions.
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22 Claims
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1. An apparatus, comprising:
a first electronic device adapted to compare a first indicator of a predicted duration of a first transmission to a second electronic device with a second indicator of a predicted duration of a second transmission to a third electronic device;
adjust starting times of at least one of the first and second transmissions to cause the first and second transmissions to end at approximately a same time; and
transmit the first and second transmissions using the adjusted starting times. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method, comprising:
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making a comparison of a first indicator of a predicted duration of a first transmission to a first electronic device with a second indicator of a predicted duration of a second transmission to a second electronic device;
beginning a transmission of a longer of the first and second transmissions; and
beginning a transmission of a shorter of the first and second transmissions after a delay approximately equal to a difference between the predicted duration of the first transmission and the predicted duration of the second transmission;
wherein the first and second transmissions use spatial division multiple access techniques. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A machine-readable medium that provides instructions, which when executed by a processing platform, cause said processing platform to perform operations comprising:
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determining predicted durations of multiple transmissions to be transmitted from an electronic device;
adjusting start times for at least some of the transmissions to cause the multiple transmissions to end at approximately a same time; and
transmitting the multiple transmissions substantially simultaneously using the adjusted start times and using spatial division multiple access techniques. - View Dependent Claims (19, 20, 21, 22)
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Specification