Early collision detection and handling in cdma-based rfid systems

A computer program product for enabling early collision detection and handling in Code Division Multiple Access (CDMA)-based radio-frequency identification (RFID) systems, the computer program product comprising a computer readable storage medium having program code embodied therewith, the program code comprising the programming instructions for:

• receiving an instruction to reflect either a single encoded bit or multiple encoded bits;
• reflecting either said single encoded bit or said multiple encoded bits to a reader, wherein said reader decodes said single encoded bit or said multiple encoded bits, wherein said decoded bit or bits are placed in a vector or a matrix by said reader;
• receiving said vector or said matrix;
• determining if said reflected bit or bits agree with a corresponding bit or bits in said vector or said matrix thereby indicating whether said reflected bit or bits were read successfully by said reader;
• and
• entering a no reflection mode in response to a disagreement between said reflected bit or bits with the corresponding bit or bits in said vector or said matrix.

A radio-frequency identification (RFID) tag, comprising:

• a memory for storing a computer program for enabling early collision detection and handling in Code Division Multiple Access (CDMA)-based RFID systems;
• and
• a processor connected to said memory, wherein said processor is configured to execute the program instructions of the computer program comprising:
• receiving an instruction to reflect either a single encoded bit or multiple encoded bits;
• reflecting either said single encoded bit or said multiple encoded bits to a reader, wherein said reader decodes said single encoded bit or said multiple encoded bits, wherein said decoded bit or bits are placed in a vector or a matrix by said reader;
• receiving said vector or said matrix;
• determining if said reflected bit or bits agree with a corresponding bit or bits in said vector or said matrix thereby indicating whether said reflected bit or bits were read successfully by said reader;
• and
• entering a no reflection mode in response to a disagreement between said reflected bit or bits with the corresponding bit or bits in said vector or said matrix.

A method for enabling early collision detection and handling in Code Division Multiple Access (CDMA)-based radio-frequency identification (RFID) systems, the method comprising:

• receiving a reflected single encoded bit or a reflected multiple encoded bits from a tag;
• decoding said single encoded bit or said multiple encoded bits;
• placing said decoded bit or bits in a vector or a matrix;
• and
• transmitting said vector or said matrix to said tag, wherein said tag determines if said reflected bit or bits agree with a corresponding bit or bits in said vector or said matrix thereby indicating whether said reflected bit or bits were read successfully, wherein said tag enters a no reflection mode in response to a disagreement between said reflected bit or bits with the corresponding bit or bits in said vector or said matrix.

A computer program product for enabling early collision detection and handling in Code Division Multiple Access (CDMA)-based radio-frequency identification (RFID) systems, the computer program product comprising a computer readable storage medium having program code embodied therewith, the program code comprising the programming instructions for:

• receiving a reflected single encoded bit or a reflected multiple encoded bits from a tag;
• decoding said single encoded bit or said multiple encoded bits;
• placing said decoded bit or bits in a vector or a matrix;
• and
• transmitting said vector or said matrix to said tag, wherein said tag determines if said reflected bit or bits agree with a corresponding bit or bits in said vector or said matrix thereby indicating whether said reflected bit or bits were read successfully, wherein said tag enters a no reflection mode in response to a disagreement between said reflected bit or bits with the corresponding bit or bits in said vector or said matrix.

A reader, comprising:

• a memory for storing a computer program for enabling early collision detection and handling in Code Division Multiple Access (CDMA)-based radio-frequency identification (RFID) systems;
• and
• a processor connected to said memory, wherein said processor is configured to execute the program instructions of the computer program comprising:
• receiving a reflected single encoded bit or a reflected multiple encoded bits from a tag;
• decoding said single encoded bit or said multiple encoded bits;
• placing said decoded bit or bits in a vector or a matrix;
• and
• transmitting said vector or said matrix to said tag, wherein said tag determines if said reflected bit or bits agree with a corresponding bit or bits in said vector or said matrix thereby indicating whether said reflected bit or bits were read successfully, wherein said tag enters a no reflection mode in response to a disagreement between said reflected bit or bits with the corresponding bit or bits in said vector or said matrix.