Systems and methods for generating a discovery signal in a device-to-device or network communication
First Claim
Patent Images
1. A user equipment (UE) for use in device-to-device or network communication, comprising:
- a processing unit; and
a memory coupled with the processing unit, the memory storing instructions, which when executed by the processor cause the processor to;
generate a plurality of multiple access symbols for transmission on a physical channel, wherein, to generate the plurality of multiple access symbols, the instructions cause the processor to;
multiply a modulation symbol with a first sequence to generate a second sequence;
apply a series of cyclic shifts to the second sequence to generate a plurality of shifted sequences;
apply at least one orthogonal code cover (OCC) of total length N to the plurality of shifted sequences;
map the orthogonal shifted sequences onto subcarriers of a plurality of physical resource blocks (PRBs) of the physical channel; and
wherein to facilitate a multiplexing function of the device-to-device or network communication, the processing unit increases at least one of;
the number of cyclic shifts, the total length of the at least one OCC, or the number of PRBs available; and
transmit the plurality of multiple access symbols on the physical channel.
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Abstract
The techniques introduced here provide for device discovery of a greater number of mobile devices in a mobile network by increasing the multiplexing capacity of the system. The techniques may be applied to device-to-device communication networks and small cells using low power nodes (e.g., pico and femto eNodeB in a 3GPP LTE or LTE advanced network). Additionally, the techniques provide for mapping between a mobile device ID and an orthogonal resource of the discovery signal.
12 Citations
24 Claims
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1. A user equipment (UE) for use in device-to-device or network communication, comprising:
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a processing unit; and a memory coupled with the processing unit, the memory storing instructions, which when executed by the processor cause the processor to; generate a plurality of multiple access symbols for transmission on a physical channel, wherein, to generate the plurality of multiple access symbols, the instructions cause the processor to; multiply a modulation symbol with a first sequence to generate a second sequence; apply a series of cyclic shifts to the second sequence to generate a plurality of shifted sequences; apply at least one orthogonal code cover (OCC) of total length N to the plurality of shifted sequences; map the orthogonal shifted sequences onto subcarriers of a plurality of physical resource blocks (PRBs) of the physical channel; and wherein to facilitate a multiplexing function of the device-to-device or network communication, the processing unit increases at least one of; the number of cyclic shifts, the total length of the at least one OCC, or the number of PRBs available; and transmit the plurality of multiple access symbols on the physical channel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A 3GPP Long Term Evolution (LTE) user equipment (UE), comprising:
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a processing unit; and a memory coupled with the processing unit, the memory storing instructions, which when executed by the processing unit cause the processing unit to; generate a plurality of multiple access symbols, wherein, to generate the plurality of multiple access symbols, the instructions cause the processing unit to; multiply a modulation symbol with a cell specific base sequence to generate a new sequence; apply a series of cyclic shifts to the new sequence to generate a plurality of shifted sequences; and apply at least one orthogonal code cover (OCC) of total length N to the shifted sequences, wherein N is equal to the number of shifted sequences and each of the at least one OCCs is applied to contiguous shifted sequences; and transmit the plurality of multiple access symbols on a physical uplink control channel (PUCCH) of an LTE network. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A non-transitory computer readable storage medium having thereon instructions, which when executed by a processor, cause the processor to perform a method for device discovery in a device-to-device or network communication, the method comprising:
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generating a plurality of multiple access symbols, wherein the plurality of multiple access symbols include a data part and a reference signal part; applying an orthogonal code cover (OCC) of length N to the data part of the plurality of multiple access symbols and an OCC of length M to the reference signal part of the plurality of multiple access symbols, wherein N is equal to the number of multiple access symbols in the data part and M is equal to the number of multiple access symbols in the reference symbol part; modulating the data part of the plurality of multiple access symbols with a phase modulation scheme; and transmitting the plurality of multiple access symbols. - View Dependent Claims (17, 18, 19, 20)
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21. A method for device discovery in a device-to-device or network communication, the method comprising:
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generating, by a user equipment (UE), a plurality of multiple access symbols for transmission on a physical channel; embedding identification information for use in device discovery in the plurality of multiple access symbols; and transmitting the plurality of multiple access symbols on the physical channel; wherein generating a plurality of multiple access symbols comprises; multiplying a modulation symbol with a base sequence to generate a new sequence, wherein the modulation symbol comprises the identification information; applying one or more orthogonal sequences to the new sequence to generate a plurality of new orthogonal sequences; and mapping the plurality of new orthogonal sequences onto subcarriers of a plurality of physical resource blocks (PRBs). - View Dependent Claims (22, 23, 24)
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Specification