Method for transmitting signal in communication system

• US 9,860,102 B2
• Filed: 07/07/2014
• Issued: 01/02/2018
• Est. Priority Date: 07/05/2013
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: Chang, Kap Seok, Kwak, Byung Jae, Lee, Moon Sik
• Primary Examiner(s): Rutkowski, Jeffrey M
• Assistant Examiner(s): Rahman, Shah
• Application Number:
  US14/324,415
• Publication Number:
  US 20150009954A1
• Time in Patent Office: 1,275 Days
• Field of Search: 370330
• CPC Class Codes: H04L 27/2607 Cyclic extensions
• CPC Class Codes: H04L 27/2613 Structure of the reference signals
• CPC Class Codes: H04L 27/26132 using repetition
• CPC Class Codes: H04L 27/2692 with preamble design, i.e. with negotiation of the synchronisation sequence with transmitter or sequence linked to the algorithm used at the receiver
• CPC Class Codes: H04W 72/02 Selection of wireless resources by user or terminal
• CPC Class Codes: H04W 74/0858 collision detection

Abstract

Disclosed is a method for transmitting signal in a communication system. A method for transmitting signal comprises generating a short training field (STF) comprising a cyclic prefix (CP) and an effective symbol period including four RP regions; generating a long training field (LTF) comprising a cyclic prefix (CP) and an effective symbol period including two RP regions; generating a frame comprising the STF and the LTF; and transmitting the frame. Thus, efficiency of the communication system may be enhanced by using the method.

Claims

1. A method for transmitting a frame by a transmitting terminal, the method comprising:

transmitting the frame to a receiving terminal,

wherein the frame includes a short training field (STF), a long training field (LTF), and collision detection field (CDF),

wherein the CDF is transmitted through at least one subcarrier among subcarriers in an effective symbol period, and using the CDF for detecting a collision in the at least one subcarrier by the receiving terminal, and

wherein the receiving terminal compares a signal strength of the at least one subcarrier with a threshold value, counts a number of the at least one subcarrier having signal strength larger than the threshold value, and detects the collision based on the number of the counted at least one subcarrier in the effective symbol period.

2. The method for transmitting frame of claim 1, wherein the STF includes five repetition patterns, and a polarity of a last repetition pattern among the five repetition patterns is different from a polarity of remaining four repetition patterns.

3. The method for transmitting frame of claim 1, wherein the CDF is configured with a busy tone signal of a physical layer.

4. A method for receiving frames by a receiving terminal, the method comprising:

receiving a first frame from a first transmitting terminal,

wherein the first frame includes a short training field (STF), a long training field (LTF), and a first collision detection field (CDF), and

wherein the first CDF is received through at least one subcarrier among subcarriers in an effective symbol period; and

receiving a second frame from a second transmitting terminal,

wherein the second frame includes a second CDF, and

wherein the receiving terminal compares a signal strength of the at least one subcarrier with a threshold value, counts a number of the at least one subcarrier having signal strength larger than the threshold value, detects a collision based on the number of the counted at least one subcarrier in the effective symbol period.