D2D DEVICE DISCOVERY METHOD AND APPARATUS BASED ON LTE CELLULAR COMMUNICATIONS SYSTEM
First Claim
1. A discovery method in a device to device (D2D) communications system, the method comprising:
- acquiring, by a first D2D user equipment (UE), timing information of the first D2D UE from a Long Term Evolution (LTE) cellular communications system;
receiving, by the first D2D UE in a first discovery subframe, a device discovery signal from a second D2D UE according to the timing information, and the device discovery signal comprises a pilot orthogonal frequency division multiplexing (OFDM) symbol and a device information OFDM symbol; and
acquiring, by the first D2D UE, an arrival time of the device discovery signal sent by the second D2D UE by performing a time domain correlation of the pilot OFDM symbol of the device discovery signal received in the first discovery subframe and a local pilot sequence, and acquiring device information of the second D2D UE by parsing the device information OFDM symbol of the device discovery signal received in the first discovery subframe.
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Abstract
This invention is applicable to the field of communications technologies, and provides a device to device (D2D) discovery method and a first D2D user equipment (UE). The method includes: the first D2D UE acquires timing information of the first D2D UE from a Lont Term Evolution (LTE) cellular communications system; receives in a discovery subframe, a device discovery signal from a second D2D UE according to the timing information, wherein the device discovery signal comprises a pilot orthogonal frequency division multiplexing (OFDM) symbol and a device information OFDM symbol; acquires an arrival time of the device discovery signal by performing a time domain correlation of the pilot OFDM symbol of the device discovery signal and a local pilot sequence, acquires device information of the second D2D UE by parsing the device information OFDM symbol of the device discovery. This invention enables a D2D UE to effectively discover other D2D UEs, improves system efficiency, and saves power of the D2D UE.
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Citations
20 Claims
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1. A discovery method in a device to device (D2D) communications system, the method comprising:
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acquiring, by a first D2D user equipment (UE), timing information of the first D2D UE from a Long Term Evolution (LTE) cellular communications system; receiving, by the first D2D UE in a first discovery subframe, a device discovery signal from a second D2D UE according to the timing information, and the device discovery signal comprises a pilot orthogonal frequency division multiplexing (OFDM) symbol and a device information OFDM symbol; and acquiring, by the first D2D UE, an arrival time of the device discovery signal sent by the second D2D UE by performing a time domain correlation of the pilot OFDM symbol of the device discovery signal received in the first discovery subframe and a local pilot sequence, and acquiring device information of the second D2D UE by parsing the device information OFDM symbol of the device discovery signal received in the first discovery subframe. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A device to device (D2D) user equipment (UE), comprising:
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an acquiring unit, configured to acquire timing information of the D2D UE from a Long Term Evolution (LTE) cellular communications system; a receiver, configured to receive, in a first discovery subframe, a device discovery signal from a second D2D UE according to the timing information, and the device discovery signal comprises a pilot orthogonal frequency division multiplexing (OFDM) symbol and a device information OFDM symbol; and a discovering unit, configured to;
acquire an arrival time of the device discovery signal sent by the second D2D UE by performing a time domain correlation of the pilot OFDM symbol of the device discovery signal received in the first discovery subframe and a local pilot sequence, and acquire device information of the second D2D UE by parsing the device information OFDM symbol of the device discovery signal received in the first discovery subframe. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification