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US 9,001,778 B2Granted
System synchronization in TD-SCDMA and TDD-LTE systems
AssigneeQUALCOMM Incorporated
InventorsTom Chin, Guangming Shi, Kuo-Chun Lee
Life of this patent
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Abstract
Certain aspects of the present disclosure propose techniques for synchronizing TD-SCDMA and TDD-LTE systems. Certain aspects provide a method that generally includes obtaining, from a base station (BS) of a first radio access technology (RAT), timing and a system frame number (SFN) for a BS of a second RAT, and performing network acquisition operations with the BS of the second RAT using the timing and the SFN.
Claims24
A method for wireless communication, comprising:
- receiving, at a user equipment (UE), a handover command from a base station associated with a first radio access technology (RAT);
- determining, at the UE, at least a synchronization signal, a downlink pilot time slot, or a midamble of a second RAT based on a frame timing of the first RAT;
- calculating, at the UE, a system frame number (SFN) of a the second RAT based at least in part on a SFN of the first RAT stored in the UE, a frame boundary and the SFN of the first RAT being synchronous with a frame boundary and the SFN of the second RAT;
- and
- transmitting, from the UE, a handover complete message to a base station associated with the second RAT based at least in part on the calculated SFN of the second RAT and the determined synchronization signal, downlink pilot time slot, or midamble.
2 more elements
An apparatus for wireless communication, comprising:
- means for receiving, at a user equipment (UE), a handover command from a base station associated with a first radio access technology (RAT);
- means for determining, at the UE, at least a synchronization signal, a downlink pilot time slot, or a midamble of a second RAT based on a frame timing of the first RAT;
- means for calculating, at the UE, a SFN of a the second RAT based at least in part on a SFN of the first RAT stored in the UE, a frame boundary and the SFN of the first RAT being synchronous with a frame boundary and the SFN of the second RAT;
- and
- means for transmitting, from the UE, a handover complete message to a base station associated with the second RAT based at least in part on the calculated SFN of the second RAT and the determined synchronization signal, downlink pilot time slot, or midamble.
2 more elements
A computer program product for wireless communication in a wireless network, comprising:
- a non-transitory computer-readable medium having non-transitory program code recorded thereon, the program code being executable by a processor to perform the steps of:
- receiving, at a user equipment (UE), a handover command from a base station associated with a first radio access technology (RAT);
- determining, at the UE, at least a synchronization signal, a downlink pilot time slot, or a midamble of a second RAT based on frame timing of the first RAT;
- calculating, at the UE, a SFN of a the second RAT based at least in part on a SFN of the first RAT stored in the UE, a frame boundary and the SFN of the first RAT being synchronous with a frame boundary and the SFN of the second RAT;
- and
- transmitting, from the UE, a handover complete message to a base station associated with the second RAT based at least in part on the calculated SFN of the second RAT and the determined synchronization signal, downlink pilot time slot, or midamble.
3 more elements
A user equipment (UE) for wireless communication, comprising:
- a memory;
- and
- at least one processor coupled to the memory, the at least one processor being configured:
- to receive a handover command from a base station associated with a first radio access technology (RAT);
- to determine at least a synchronization signal, a downlink pilot time slot, or a midamble of a second RAT based on frame timing of the first RAT;
- to calculate a SFN of a the second RAT based at least in part on a SFN of the first RAT stored in the UE, a frame boundary and the SFN of the first RAT being synchronous with a frame boundary and the SFN of the second RAT;
- and
- to transmit a handover complete message to a base station associated with the second RAT based at least in part on the calculated SFN of the second RAT and the determined synchronization signal, downlink pilot time slot, or midamble.
5 more elements
Dependencies are inferred from the claim text.