Base station synchronization
First Claim
1. A method, for use in a radio network controller (RNC), of maintaining base stations synchronized in a wireless communication system, said wireless communication system comprising a node B comprising a plurality of base stations, an RNC, and at least one user equipment (UE), the method comprising:
- updating a covariant matrix and a database;
detecting that a time error variance of a first base station exceeds a predetermined threshold;
signaling to a UE to measure a time difference of arrival (TDOA) between signals transmitted from the first base station and a reference base station;
measuring and reporting the TDOA measurement;
comparing the measured TDOA value with a value stored in the database; and
transmitting a message to the first base station to adjust its time base based on said comparison.
0 Assignments
0 Petitions
Accused Products
Abstract
In a radio network controller (RNC), a covariant matrix and a database are updated. The RNC then detects that a first base station'"'"'s time-error-variance exceeds a predetermined threshold. In response, the RNC signals to a user-equipment (UE) to measure a time difference of arrival (TDOA) between signals transmitted from the first base station and a reference base station. The UE measures the requested TDOA between the designated base stations and reports the measurement results back to the RNC. The RNC then compares the measured TDOA with a TDOA value stored in the database. Based on the comparison, the RNC signals to the first base station to adjust its time base.
34 Citations
12 Claims
-
1. A method, for use in a radio network controller (RNC), of maintaining base stations synchronized in a wireless communication system, said wireless communication system comprising a node B comprising a plurality of base stations, an RNC, and at least one user equipment (UE), the method comprising:
-
updating a covariant matrix and a database;
detecting that a time error variance of a first base station exceeds a predetermined threshold;
signaling to a UE to measure a time difference of arrival (TDOA) between signals transmitted from the first base station and a reference base station;
measuring and reporting the TDOA measurement;
comparing the measured TDOA value with a value stored in the database; and
transmitting a message to the first base station to adjust its time base based on said comparison. - View Dependent Claims (2, 3, 4, 5)
-
-
6. The method of clam 5, wherein the reference base station is a master base station in a node B, and wherein the first base station is slaved to said master base station.
-
7. An RNC configured to maintain base stations synchronized, wherein said base stations are within a node B, the RNC comprising:
-
a covariant matrix configured to maintain a state estimate of each of a plurality of base stations;
a database configured to maintain received TDOA measurement values;
a message generator configured to generate and transmit measurement-request messages;
a measurement receive device configured to receive and process received TDOA measurement values; and
a synchronization controller configured to compute a time of transmission of each of the base stations and filter gains based on received TDOA measurement values. - View Dependent Claims (8, 9, 10, 11, 12)
-
Specification