Uplink timing error reduction method and apparatus
First Claim
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1. A wireless terminal comprising:
- a communications interface configured to receive a timing advance command control element over a radio interface from a network node; and
an uplink (UL) transmission timing update unit configured, upon receipt of the timing advance command control element, to update UL transmission timing for cells in a timing advance (TA) group even when a TA timer for the associated TA group is not running and to keep a transmitter of the wireless terminal active even when not transmitting in the uplink in accordance with slew rate parameters selected for operation of the transmitter when the transmitter is not transmitting in the uplink, the slew rate parameters being parameters associated with the rate at which the wireless terminal performs UL timing adjustments.
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Abstract
The technology presented in this disclosure pertains to telecommunication. For example, there is presented a method of operating a wireless terminal 30. A timing advance command (TAC) control element (CE) is received over a radio interface (from a network node 28). Upon receipt of the TAC CE, the method continues by updating UL (uplink) transmission timing for cells in a timing advance (TA) group even when a TA timer for the associated TA group is not running.
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Citations
27 Claims
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1. A wireless terminal comprising:
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a communications interface configured to receive a timing advance command control element over a radio interface from a network node; and an uplink (UL) transmission timing update unit configured, upon receipt of the timing advance command control element, to update UL transmission timing for cells in a timing advance (TA) group even when a TA timer for the associated TA group is not running and to keep a transmitter of the wireless terminal active even when not transmitting in the uplink in accordance with slew rate parameters selected for operation of the transmitter when the transmitter is not transmitting in the uplink, the slew rate parameters being parameters associated with the rate at which the wireless terminal performs UL timing adjustments. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of operating a wireless terminal comprising:
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receiving a timing advance command control element over a radio interface from a network node; upon receipt of the timing advance command control element, updating uplink (UL) transmission timing for cells in a timing advance (TA) group even when a TA timer for the associated TA group is not running; and keeping a transmitter of the wireless terminal active even when not transmitting in the uplink in accordance with slew rate parameters selected for operation of the transmitter when the transmitter is not transmitting in the uplink, the slew parameters being parameters associated with the rate at which the wireless terminal performs UL timing adjustments. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification