Base station synchronization

• US 7,924,961 B2
• Filed: 05/27/2008
• Issued: 04/12/2011
• Est. Priority Date: 04/07/2000
• Status: Expired due to Fees

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Zeira, Eldad, Dick, Stephen G.
• Primary Examiner(s): KIM, KEVIN
• Application Number:
  US12/127,063
• Publication Number:
  US 20080227474A1
• Time in Patent Office: 1,050 Days
• Field of Search: 375/354, 375/356
• US Class Current: 375/356
• CPC Class Codes: H04B 1/7073 Synchronisation aspects
• CPC Class Codes: H04B 2201/70702 Intercell-related aspects
• CPC Class Codes: H04B 7/2668 Arrangements for Wireless Code-Division Multiple Access [CDMA] System Synchronisation, for code acquisition H04B1/7075, for code tracking H04B1/7085
• CPC Class Codes: H04B 7/2687 Inter base stations synchronisation
• CPC Class Codes: H04B 7/269 Master/slave synchronisation
• CPC Class Codes: H04B 7/2693 Centralised synchronisation, i.e. using external universal time reference, e.g. by using a global positioning system [GPS] or by distributing time reference over the wireline network
• CPC Class Codes: H04B 7/2696 Over the air autonomous synchronisation, e.g. by monitoring network activity H04B7/2693 takes precedence
• CPC Class Codes: H04J 3/0641 Change of the master or reference, e.g. take-over or failure of the master
• CPC Class Codes: H04W 56/002 Mutual synchronization
• CPC Class Codes: H04W 56/0065 using measurement of signal travel time
• CPC Class Codes: H04W 56/0075 based on arrival time vs. expected arrival time

Abstract

A method, implemented in a user equipment (UE), of maintaining base station synchronization, comprises receiving a measurement message from a radio network controller (RNC) directing the UE to measure a time difference of arrival (TDOA) between signals transmitted from a first and second base station. The UE receives a transmission from the first and second base stations and measures the TDOA of the transmission from the first and second base station. The UE transmits the measurement of the TDOA of the transmission from the first base station to the first base station, and the measurement of the TDOA of the transmission from the second base station to the second base station.

Claims

1. A method for time synchronizing a plurality of base stations in a wireless communication system, comprising:

sending a synch burst from at least one mastercell, wherein the mastercell has a better time synchronization quality than other cells;

for at least one cell other than the mastercell, measuring a synch burst from at least the mastercell and indicating a timing associated with the synch burst to a radio network controller (RNC), wherein the measuring further comprises sending, by the RNC, a request for a base station time of arrival (BSTOA) value to a cell other than the mastercell, and transmitting the BSTOA value; and

sending, by the RNC, a timing adjustment to the at least one cell other than the mastercell.

2. The method of claim 1, further comprising:

updating a covariant matrix database.

3. A method for time synchronizing a plurality of base stations in a wireless communication system, comprising:

sending a synch burst from at least one mastercell, wherein the mastercell has a better time synchronization quality than other cells;

for at least one cell other than the mastercell, measuring a synch burst from at least the mastercell and indicating a timing associated with the synch burst to a radio network controller (RNC), sending a request, by the RNC, for a base station time of arrival (BSTOA) value to at least one of a plurality of user equipments (UEs) to measure the at least one cell other than the mastercell;

transmitting the BSTOA value; and

sending, by the RNC, a timing adjustment to the at least one cell other than the mastercell.

4. A base station, comprising:

circuitry configured to send a synch burst from at least one mastercell, wherein the mastercell has a better time synchronization quality than other cells on a condition that the base station is in the mastercell;

circuitry configured to measure for at least one cell other than the mastercell, a synch burst from at least the mastercell and indicate a timing associated with the synch burst to a radio network controller (RNC) on a condition that the base station is in the cell other than the mastercell;

circuitry configured to send a request for a base station time of arrival (BSTOA) value to a cell other than the mastercell on a condition that the base station is in the mastercell;

circuitry configured to transmit the BSTOA value on a condition that the base station is in the cell other than the mastercell; and

circuitry configured to receive from the RNC, a timing adjustment to the at least one cell other than the mastercell on a condition that the base station is in the cell other than the mastercell.