Terminal synchronization method and apparatus for use in wireless communication network
First Claim
1. A synchronization method of a first terminal, the method comprising:
- identifying a first reception time at which a first synchronization signal is received from a second terminal, in an initial observation period;
configuring a first reference time based on a predetermined frame length by using a position of the first reception time in the initial observation period;
determining a second synchronization signal having a maximum transmission power level among a plurality of synchronization signals received from a plurality of terminals, in a reception period following the initial observation period, the second synchronization signal being received at a second reference time in the reception period;
comparing the first reference time with the second reference time, the second reference time being determined based on the predetermined frame length by using a position of the second reception time in the reception period;
updating the first reference time to the second reference time for the synchronization, when the second reference time precedes the first reference time, based on the compared result; and
transmitting a third synchronization signal based on the first reference time or the second reference time based on whether the first reference time is updated to the second reference time, to at least one terminal, in a transmission period following the initial observation period.
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Abstract
A terminal synchronization method and apparatus for use in a wireless communication system are provided. A synchronization method includes configuring, at the terminal, a synchronization signal reference time depending on whether a synchronization signal is received in an initial observation period as long as at least two frames, monitoring to receive the synchronization signal in an alternation period of a transmission period and a reception period, the alternation period following the initial observation period, updating the reference time depending on whether the synchronization signal is received in the reception period, transmitting the synchronization signal at the updated reference time in the transmission period, and updating the reference time depending on whether the synchronization signal is received in a dedicated observation period following the alternation period. The synchronization apparatus and method are advantageous in that synchronization is obtained without assistance of a base station, an Access Point (AP), etc.
31 Citations
17 Claims
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1. A synchronization method of a first terminal, the method comprising:
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identifying a first reception time at which a first synchronization signal is received from a second terminal, in an initial observation period; configuring a first reference time based on a predetermined frame length by using a position of the first reception time in the initial observation period; determining a second synchronization signal having a maximum transmission power level among a plurality of synchronization signals received from a plurality of terminals, in a reception period following the initial observation period, the second synchronization signal being received at a second reference time in the reception period; comparing the first reference time with the second reference time, the second reference time being determined based on the predetermined frame length by using a position of the second reception time in the reception period; updating the first reference time to the second reference time for the synchronization, when the second reference time precedes the first reference time, based on the compared result; and transmitting a third synchronization signal based on the first reference time or the second reference time based on whether the first reference time is updated to the second reference time, to at least one terminal, in a transmission period following the initial observation period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 15, 16)
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8. A first terminal for performing synchronization, the first terminal comprising:
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a communication transceiver configured to transmit and receive synchronization signals; and at least one processor configured to; identify a first reception time at which a first synchronization signal is received from a second terminal, in an initial observation period, control configuring a first reference time based on a predetermined frame length by using a position of the first reception time in the initial observation period, determine a second synchronization signal having a maximum transmission power level among a plurality of synchronization signals received from a plurality of terminals in a reception period following the initial observation period, the second synchronization signal being received at a second reference time in the reception period, compare the first reference time with the second reference time, the second reference time being determined based on the predetermined frame length by using a position of the second reception time in the reception period, update the first reference time to the second reference time for the synchronization, when the second reference time precedes the first reference time, based on the compared result, and transmit a third synchronization signal based on the first reference time or the second reference time based on whether the first reference time is updated to the second reference time, to at least one terminal in a transmission period following the initial observation period. - View Dependent Claims (9, 10, 11, 12, 13, 14, 17)
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Specification