Method and apparatus for deriving fine timing to assist position acquisition in a communication network
OwnerTom Chin, Guangming Shi +1inventors
InventorsTom Chin, Guangming Shi, Kuo-Chun Lee
Life of this patent
Estimating the term…
Abstract
In wireless communication systems network timing may assist position location operations. A user equipment may obtain a rough network time from a server to tag when a downlink frame is received. That time may be based on a network frame boundary, particularly for synchronous networks. An estimate of the one way delay, which may be half of a timing advance value, may be added to arrive at a fine timing estimate. The fine timing estimate may assist with position location when there is a delay by a position location receiver in determining the user equipment's location.
Claims20
A method for wireless communication, comprising:
- tagging a downlink frame with a downlink frame receive time based on a coarse time from a received Time Division-Synchronous Code Division Multiple Access (TD-SCDMA) time protocol;
- deriving a downlink frame transmission time for the tagged downlink frame, based on the downlink frame receive time;
- and
- estimating a fine time based on the downlink frame transmission time and a transmission delay between a base station and a user equipment.
A user equipment (UE) configured for wireless communication, the UE comprising:
- means for tagging a downlink frame with a downlink frame receive time using a coarse time from a received Time Division-Synchronous Code Division Multiple Access (TD-SCDMA) time protocol;
- means for deriving a downlink frame transmission time for the tagged downlink frame, based on the downlink frame receive time;
- and
- means for estimating a fine time based on the downlink frame transmission time and a transmission delay between a base station and a user equipment.
A computer program product, comprising:
- a non-transitory computer-readable medium having program code recorded thereon, the program code comprising:
- program code to tag a downlink frame with a downlink frame receive time using a coarse time from a received Time Division-Synchronous Code Division Multiple Access (TD-SCDMA) time protocol for;
- program code to derive a downlink frame transmission time for the tagged downlink frame, based on the downlink frame receive time;
- and
- program code to estimate a fine time based on the downlink frame transmission time and a transmission delay between a base station and a user equipment.
A user equipment (UE) configured for wireless communication, comprising:
- at least one processor;
- and
- a memory coupled to the at least one processor,
- the at least one processor being configured:
- to tag a downlink frame with a downlink frame receive time using use a coarse time from a received Time Division-Synchronous Code Division Multiple Access (TD-SCDMA) time protocol;
- to derive a downlink frame transmission time for the tagged downlink frame, based on the downlink frame receive time;
- and
- to estimate a fine time based on the downlink frame transmission time and a transmission delay between a base station and a user equipment.
Dependencies are inferred from the claim text.