Uplink timing error reduction method and apparatus
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsMattias Bergström, Muhammad Kazmi
Life of this patent
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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.
Claims46
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.
A method of operating a wireless terminal comprising:
- receiving a timing advance command control element over a radio interface from a network node;
- and
- 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.
A network node comprising:
- a communications interface configured to communicate information over a radio interface with a wireless terminal;
- and
- means for making a selection between plural different updating modes for use by the wireless terminal for updating an uplink (UL) transmission timing for cells in a timing advance (TA) group, the different modes comprising respective different ways of updating the UL transmission timing for the cells in a TA group even when a TA timer for the associated TA group is not running.
A method of operating a network node, comprising:
- communicating information over a radio interface with a wireless terminal;
- and
- making a selection between a plurality of different updating modes for use by the wireless terminal for updating an uplink (UL) transmission timing for cells in a timing advance (TA) group, the different modes including respective different ways of updating the UL transmission timing for the cells in a TA group even when a TA timer for the associated TA group is not running.
A wireless terminal comprising:
- a communications interface configured to receive a timing advance command control element over a radio interface from a network node;
- an uplink (UL) transmission timing update unit is configured to:
- update UL transmission timing for serving cells in a timing advance (TA) group even when a TA timer for the associated TA group is not running;
- and
- update UL transmission timing for the serving cells in the TA group by performing autonomous UL timing adjustment to follow a downlink (DL) cell transmission timing in each TA group when the TA timer is not running even if there is no UL transmission on the serving cells belonging to the same TA group.
A method of operating a wireless terminal, comprising:
- receiving a timing advance a timing advance command control element over a radio interface from a network node;
- updating uplink (UL) transmission timing for serving cells in a timing advance (TA) group even when a TA timer for the associated TA group is not running;
- and
- the updating further comprises updating UL transmission timing for the serving cells in the TA group by performing autonomous UL timing adjustment to follow a downlink (DL) cell transmission timing in each TA group when the TA timer is not running even if there is no UL transmission on the cells belonging to the same TA group.
Dependencies are inferred from the claim text.