Secondary Cell Synchronization for Carrier Aggregation
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Accused Products
Abstract
A carrier aggregation application method is provided of attaining time synchronization to a secondary cell for a wireless communication device usable in a cellular communication network. The method comprises, if a time reference of the secondary cell is unknown to the wireless communication device: setting a preliminary time reference of the secondary cell to equal a time reference of a primary cell of the carrier aggregation application; performing a synchronization signal based detection of the time reference of the secondary cell based on the preliminary time reference and one or more synchronization signals transmitted in the secondary cell; performing preliminary time reference based channel state measurements of the secondary cell based on the preliminary time reference and one or more reference signals transmitted in the secondary cell; setting, based on the synchronization signal based detection, a value of a channel quality indicator to either a nominal value or a value based on the preliminary time reference based channel state measurements; and transmitting a channel state information report comprising the channel quality indicator to the cellular communication network. An arrangement for a wireless communication device usable in a cellular communication network, adapted to attain time synchronization to a secondary cell of a carrier aggregation application is also disclosed. A modem comprising the arrangement and wireless communication device comprising the arrangement are also disclosed.
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Citations
65 Claims
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1-33. -33. (canceled)
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34. A carrier aggregation application method of attaining time synchronization to a secondary cell for a wireless communication device usable in a cellular communication network, the method comprising:
in response to a time reference of the secondary cell being unknown to the wireless communication device; setting a preliminary time reference of the secondary cell to equal a time reference of a primary cell of the carrier aggregation application; performing a synchronization signal based detection of the time reference of the secondary cell based on the preliminary time reference and one or more synchronization signals transmitted in the secondary cell; performing preliminary time reference based channel state measurements of the secondary cell based on the preliminary time reference and one or more reference signals transmitted in the secondary cell; setting, based on the synchronization signal based detection, a value of a channel quality indicator to either a nominal value or a value based on the preliminary time reference based channel state measurements; and transmitting a channel state information report comprising the channel quality indicator to the cellular communication network. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51)
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52. A computer program product stored in a non-transitory computer readable medium for facilitating a carrier aggregation application method in attaining time synchronization to a secondary cell for a wireless communication device usable in a cellular communication network, the computer program product comprising software instructions which, when run on a data processing circuit, causes the data processing circuit to:
in response to a time reference of the secondary cell being unknown to the wireless communication device; set a preliminary time reference of the secondary cell to equal a time reference of a primary cell of the carrier aggregation application; perform a synchronization signal based detection of the time reference of the secondary cell based on the preliminary time reference and one or more synchronization signals transmitted in the secondary cell; perform preliminary time reference based channel state measurements of the secondary cell based on the preliminary time reference and one or more reference signals transmitted in the secondary cell; set, based on the synchronization signal based detection, a value of a channel quality indicator to either a nominal value or a value based on the preliminary time reference based channel state measurements; and transmit a channel state information report comprising the channel quality indicator to the cellular communication network.
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53. An arrangement for a wireless communication device usable in a cellular communication network, configured to attain time synchronization to a secondary cell of a carrier aggregation application, the arrangement comprising:
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a receiver configured to receive one or more synchronization signals transmitted in the secondary cell and one or more reference signals transmitted in the secondary cell; a signal processor circuit configured to, when a time reference of the secondary cell is unknown to the wireless communication device; set a preliminary time reference of the secondary cell to equal a time reference of a primary cell of the carrier aggregation application; perform a synchronization signal based detection of the time reference of the secondary cell based on the preliminary time reference and one or more synchronization signals transmitted in the secondary cell; perform preliminary time reference based channel state measurements of the secondary cell based on the preliminary time reference and one or more reference signals transmitted in the secondary cell; and set, based on the synchronization signal based detection, a value of a channel quality indicator to either a nominal value or a value based on the preliminary time reference based channel state measurements; and a transmitter configured to transmit a channel state information report comprising the channel quality indicator to the cellular communication network. - View Dependent Claims (54, 55, 56, 57, 58, 59, 60, 61, 62, 63)
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64. A modem configured to attain time synchronization to a secondary cell of a carrier aggregation application in a cellular communication network, comprising:
an arrangement comprising; a receiver configured to receive one or more synchronization signals transmitted in the secondary cell and one or more reference signals transmitted in the secondary cell; a signal processor circuit configured to, when a time reference of the secondary cell is unknown to the wireless communication device; set a preliminary time reference of the secondary cell to equal a time reference of a primary cell of the carrier aggregation application; perform a synchronization signal based detection of the time reference of the secondary cell based on the preliminary time reference and one or more synchronization signals transmitted in the secondary cell; perform preliminary time reference based channel state measurements of the secondary cell based on the preliminary time reference and one or more reference signals transmitted in the secondary cell; and set, based on the synchronization signal based detection, a value of a channel quality indicator to either a nominal value or a value based on the preliminary time reference based channel state measurements; and a transmitter configured to transmit a channel state information report comprising the channel quality indicator to the cellular communication network.
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65. A wireless communications device configured to attain time synchronization to a secondary cell of a carrier aggregation application in a cellular communication network, comprising:
an arrangement comprising; a receiver configured to receive one or more synchronization signals transmitted in the secondary cell and one or more reference signals transmitted in the secondary cell; a signal processor circuit configured to, when a time reference of the secondary cell is unknown to the wireless communication device; set a preliminary time reference of the secondary cell to equal a time reference of a primary cell of the carrier aggregation application; perform a synchronization signal based detection of the time reference of the secondary cell based on the preliminary time reference and one or more synchronization signals transmitted in the secondary cell; perform preliminary time reference based channel state measurements of the secondary cell based on the preliminary time reference and one or more reference signals transmitted in the secondary cell; and set, based on the synchronization signal based detection, a value of a channel quality indicator to either a nominal value or a value based on the preliminary time reference based channel state measurements; and a transmitter configured to transmit a channel state information report comprising the channel quality indicator to the cellular communication network.
Specification