Secure communication method and system based on bit error probability
First Claim
1. A method for performing Hybrid Automatic Repeat Request (HARQ) by a first terminal in a wireless communication system, the method comprising:
- transmitting data using a specific code word selected from a plurality of code words included in a mother code;
calculating a Bit Error Rate (BER) upper bound for a second terminal that receives the data;
calculating a BER lower bound for a third terminal that is able to eavesdrop the data; and
performing the HARQ based on whether the BER upper bound is greater than a BER reference level for the second terminal and whether a probability of the BER lower bound being less than the calculated BER reference level is less than a predetermined value,wherein the BER upper bound is determined based on a transmission rate corresponding to the mother code and channel information corresponding to the second terminal, andwherein the BER lower bound is determined based on the transmission rate and channel information corresponding to the third terminal.
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Accused Products
Abstract
Provided is a method for performing Hybrid Automatic Repeat Request (HARQ) by a data transmitting terminal in a wireless communication system. The terminal transmits data using a specific code word selected from a plurality of code words included in a mother code, calculates a Bit Error Rate (BER) upper bound for a receiving terminal that receives the data, calculates a BER lower bound for another terminal that is able to eavesdrop the data, and performs the HARQ based on whether the BER upper bound is greater than a BER reference level for the receiving terminal and whether a probability of the BER lower bound being less than the BER reference level for the another terminal is less than a predetermined value.
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Citations
12 Claims
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1. A method for performing Hybrid Automatic Repeat Request (HARQ) by a first terminal in a wireless communication system, the method comprising:
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transmitting data using a specific code word selected from a plurality of code words included in a mother code; calculating a Bit Error Rate (BER) upper bound for a second terminal that receives the data; calculating a BER lower bound for a third terminal that is able to eavesdrop the data; and performing the HARQ based on whether the BER upper bound is greater than a BER reference level for the second terminal and whether a probability of the BER lower bound being less than the calculated BER reference level is less than a predetermined value, wherein the BER upper bound is determined based on a transmission rate corresponding to the mother code and channel information corresponding to the second terminal, and wherein the BER lower bound is determined based on the transmission rate and channel information corresponding to the third terminal. - View Dependent Claims (2, 3, 4)
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5. A method for performing Hybrid Automatic Repeat Request (HARQ) by a first terminal in a wireless communication system, the method comprising:
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transmitting data using a specific code word from a plurality of code words included in a mother code; receiving a positive-acknowledgement (ACK)/negative-acknowledgement (NACK) message from a second terminal that receives the data; calculating a Bit Error Rate (BER) lower bound for a third terminal that is able to eavesdrop the data; and performing the HARQ based on whether the ACK/NACK message is an ACK message or an NACK message and whether a probability of the BER lower bound being less than the calculated BER reference level is less than a predetermined value, wherein the BER lower bound is determined based on a transmission rate corresponding to the mother code and channel information corresponding to the third terminal. - View Dependent Claims (6, 7, 8)
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9. A first terminal for performing Hybrid Automatic Repeat Request (HARQ) in a wireless communication system, the first terminal comprising:
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an RF (Radio Frequency) unit configured to transmit data using a specific code word selected from a plurality of code words included in a mother code; and a processor configured to; calculate a Bit Error Rate (BER) upper bound for a second terminal that receives the data; calculate a BER lower bound for a third terminal that is able to eavesdrop the data; and perform Hybrid Automatic Repeat Request (HARQ) based on at least whether a received positive-acknowledgement (ACK)/negative-acknowledgement (NACK) message is an ACK message or a NACK message, whether the BER upper bound is less than a BER reference level for the second terminal, or whether a probability of the BER lower bound being less than a BER reference level for the third terminal is less than a predetermined value, wherein the BER upper bound is determined based on a transmission rate corresponding to the mother code and channel information corresponding to the second terminal, and wherein the BER lower bound is determined based on the transmission rate and channel information corresponding to the third terminal. - View Dependent Claims (10, 11, 12)
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Specification