System synchronization in TD-SCDMA and TDD-LTE systems
First Claim
Patent Images
1. 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.
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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.
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Citations
24 Claims
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1. A method for wireless communication, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An apparatus for wireless communication, comprising:
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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. - View Dependent Claims (8, 9, 10, 11, 12)
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13. 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. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A user equipment (UE) for wireless communication, comprising:
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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. - View Dependent Claims (20, 21, 22, 23, 24)
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Specification