Carrier type (NCT) information embedded in synchronization signal
First Claim
1. A method to define a downlink signal in a first carrier type, comprising:
- generating a first binary sequence for a first subframe of the downlink signal and a second binary sequence for a second subframe of the downlink signal, the first and second binary sequences being part of a Secondary Synchronization Signal (SSS) for the downlink signal, the downlink signal comprising a 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) downlink signal so that a legacy device can avoid to attempt to connect to a new carrier type (NCT) downlink signal that is unavailable to the legacy device, and thereby conserve battery power;
processing the first binary sequence with a first scrambling sequence; and
processing the second binary sequence with a second scrambling sequence;
the first and second scrambling sequences being distinguishable from a second carrier type,wherein the first and second scrambling sequences each comprise a cyclic-shifted version of an m-sequence.
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Accused Products
Abstract
A Second Synchronous Signal (SSS) for a 3GPP LTE downlink signal is generated in such a way that a legacy User Equipment (UE) can determine whether the downlink signal comprises a legacy downlink signal or a New Carrier Type (NCT) downlink signal, which is unavailable to a legacy UE. One exemplary embodiment provides that a first binary sequence and a second binary sequence are generated in which the first and second binary sequences are part of the SSS for the downlink signal. The first binary sequence is multiplied by a first scrambling sequence, and the second binary sequence by a second scrambling sequence in which the first and second scrambling sequences are selected to indicate that the downlink signal is a new carrier type downlink signal. Other exemplary embodiments provide that an order of the first and second scrambling sequences indicates whether the downlink signal is a NCT downlink signal.
12 Citations
19 Claims
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1. A method to define a downlink signal in a first carrier type, comprising:
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generating a first binary sequence for a first subframe of the downlink signal and a second binary sequence for a second subframe of the downlink signal, the first and second binary sequences being part of a Secondary Synchronization Signal (SSS) for the downlink signal, the downlink signal comprising a 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) downlink signal so that a legacy device can avoid to attempt to connect to a new carrier type (NCT) downlink signal that is unavailable to the legacy device, and thereby conserve battery power; processing the first binary sequence with a first scrambling sequence; and processing the second binary sequence with a second scrambling sequence; the first and second scrambling sequences being distinguishable from a second carrier type, wherein the first and second scrambling sequences each comprise a cyclic-shifted version of an m-sequence. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An information-handling system, comprising:
- a receiver capable of receiving a downlink signal; and
a processor coupled to the receiver, the processor being configured to determine whether the received downlink signal is a first carrier type downlink signal or a second carrier type by unscrambling a Secondary Synchronization Signal (SSS) of the downlink signal using first and second scrambling sequences, the first and second scrambling sequences being selected to indicate that the downlink signal comprises the first carrier type downlink signal, and the first carrier type downlink signal being unavailable to a legacy User Equipment (UE) of a 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) communication system so that a legacy device can avoid to attempt to connect to a new carrier type (NCT) downlink signal that is unavailable to the legacy device, and thereby conserve battery power,wherein the first and second scrambling sequences each comprise a cyclic-shifted version of an m-sequence. - View Dependent Claims (12, 13, 14, 15, 16, 17)
- a receiver capable of receiving a downlink signal; and
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18. A non-transitory computer-readable medium having instructions stored thereon that, if executed, result in at least the following:
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generating a first binary sequence for a first subframe of a downlink signal and a second binary sequence for a second subframe of the downlink signal, the first and second binary sequences being part of a Secondary Synchronization Signal (SSS) for the downlink signal and being based on a physical-layer identification of a cell transmitting the downlink signal, the downlink signal comprising a 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) downlink signal so that a legacy device can avoid to attempt to connect to a new carrier type (NCT) downlink signal that is unavailable to the legacy device, and thereby conserve battery power; processing the first binary sequence with a first scrambling sequence; processing the second binary sequence with a second scrambling sequence; and the first and second scrambling sequences indicating that the downlink signal is a new carrier type downlink signal, and a new carrier type downlink signal being unavailable to a legacy User Equipment (UE), wherein the first and second scrambling sequences each comprise a cyclic-shifted version of an m-sequence. - View Dependent Claims (19)
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Specification