Uplink Synchronization Processing
1 Assignment
0 Petitions
Accused Products
Abstract
Uplink synchronization of user equipment, UE, (30, 40, 50) served by a radio base station, RBS, (20) is enabled by triggering (re)start of timing alignment, TA, timer (180) in response to a first TA command. Uplink timing of data received from the UE (30, 40, 50) during a measuring time window (63) constituting a defined sub-interval of a time interval (60) of the TA timer (180) is measured and employed for determining a timing advance for the UE (30, 40, 50). Transmission of a second TA command comprising a notification of the timing advance is co-scheduled together with a scheduled downlink data transmission to the UE (30, 40, 50) during a following scheduling time window (65) constituting a defined sub-interval of the time interval (60). The number of TA commands that are scheduled by themselves are minimized to free radio resources and increase the downlink throughput.
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Citations
45 Claims
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1-23. -23. (canceled)
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24. A method of enabling uplink synchronization of user equipment present in a cell served by a radio base station, said method comprising:
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transmitting a first timing alignment command to said user equipment triggering, based on said first timing alignment command, start of a timing alignment timer with an associated time interval; measuring uplink timing of uplink data received from said user equipment during a measuring time window constituting a defined sub-interval of said time interval, wherein no timing alignment command is transmitted to said user equipment during said measuring time window; determining, based on said measured uplink timing, a timing advance for said user equipment; co-scheduling transmission of a second timing alignment command comprising a notification of said timing advance with a scheduled downlink data transmission to said user equipment during a following scheduling time window constituting a defined sub-interval of said time interval; and co-transmitting said second timing alignment command and said downlink data to said user equipment during said scheduling time window. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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37. An uplink synchronization device comprising:
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a transmitter configured to transmit a first timing alignment command to user equipment triggering, based on said first timing alignment command, start of a timing alignment timer with an associated time interval; a timing measurer configured to measure uplink timing of uplink data transmitted by said user equipment during a measuring time window constituting a defined sub-interval of said time interval, wherein no timing alignment command is transmitted by said transmitter to said user equipment during said measuring time window; a timing determiner configured to determine a timing advance for said user equipment based on said uplink timing measured by said timing measurer; and a transmission scheduler configured to co-schedule transmission of a second timing alignment command comprising a notification of said timing advance with a scheduled downlink data transmission to said user equipment during a following scheduling time window constituting a defined sub-interval of said time interval, wherein said transmitter is configured to co-transmit said second downlink command and said downlink data to said user equipment during said scheduling time window. - View Dependent Claims (38, 39, 40, 41, 42, 43, 44)
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45. A radio base station comprising:
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a transmitter configured to transmit downlink data to user equipment; a receiver configured to receive uplink data from said user equipment; and an uplink synchronization device comprising; a transmitter configured to transmit a first timing alignment command to said user equipment triggering, based on said first timing alignment command, start of a timing alignment timer with an associated time interval; a timing measurer configured to measure uplink timing of uplink data transmitted by said user equipment during a measuring time window constituting a defined sub-interval of said time interval, wherein no timing alignment command is transmitted by said transmitter to said user equipment during said measuring time window; a timing determiner configured to determine a timing advance for said user equipment based on said uplink timing measured by said timing measurer; and a transmission scheduler configured to co-schedule transmission of a second timing alignment command comprising a notification of said timing advance with a scheduled downlink data transmission to said user equipment during a following scheduling time window constituting a defined sub-interval of said time interval, wherein said transmitter is configured to co-transmit said second downlink command and said downlink data to said user equipment during said scheduling time window.
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Specification