Multi-access communication system

A multi-access receiver for use in a multiple access wireless communication system comprising:

• a plurality of terminals;
• and
• a multi-access receiver,
• wherein each terminal comprises:
• a transmitter configured to transmit a message during a slot of a frame to the multi-access receiver when in an active state,
• a memory, and
• a terminal processor,
• wherein when the terminal is in an active state the transmitter is permitted to transmit a message and when the terminal is in an inactive state the transmitter is prevented from transmitting, and the memory configured to store a probability of transmission p which during an active state, the terminal processor uses to determine whether to transmit in a frame;
• and
• the multi-access receiver comprises:
• a receiver for simultaneously receive m transmissions in each slot of a frame, and
• a multiuser decoder for decoding the received transmissions;
• and
• a multi-access receiver processor,
• wherein the multi-access receiver processor is configured to perform a method for optimizing a network parameter in a set of network parameters, wherein the network parameters comprise (p, n, m, ε) where p is the probability of an active terminal deciding to transmit in a frame, n is the number of slots per frame, m is the number of simultaneous transmissions that a multiuser can successfully decode in a single slot, and ε is the probability of failure of a terminal to successfully transmit a message whilst in a field of view of the multiple access receiver, and the method of optimising a network parameter comprising:
• selecting the network parameter and numerically solving q=1−pQ(m,λ) and
• K
• 0
• =
• 1
• -
• ɛ
• 1
• /
• F
• 1
• -
• ɛ
• ⁢
• λ
• *
• ⁢
• n
• to optimise λ* where 1−q is the proportion of terminals that succeed in transmitting in a frame and Q is the gamma function, K0 is the number of new terminals that enter the field of view each frame, F is the number of frames a terminal is in the field of view for, λ=k/n and k=pK and where K is the number of active terminals in the field of view;
• and
• transmit transmitting the optimized network parameter to the plurality of terminals.

A terminal for use in a multiple access wireless communication system comprising:

• a plurality of terminals;
• and
• a multi-access receiver comprising:
• a receiver for simultaneously receive m transmissions in each slot of a frame;
• and
• a multiuser decoder for decoding the received transmissions,
• wherein each terminal comprises:
• a transmitter configured to transmit a message during a slot of a frame to the multi-access receiver when in an active state;
• a memory;
• and
• a processor,
• wherein the processor is configured to control the mode of operation of the terminal, and when the terminal is in an active state the terminal is permitted to transmit a message and when the terminal is in an inactive state the transmitter is prevented from transmitting, and the memory stores a probability of transmission p which during an active state, the processor uses to determine whether to transmit in a frame, and
• the processor is further configured to perform a method for optimizing a network parameter in a set of network parameters, wherein the network parameters comprise (p, n, m, ε) where p is the probability of an active terminal deciding to transmit in a frame, n is the number of slots per frame, m is the number of simultaneous transmissions that a multiuser can successfully decode in a single slot, and ε is the probability of failure of a terminal to successfully transmit a message whilst in a field of view of the multiple access receiver, and the method of optimising a network parameter comprising:
• selecting the network parameter and numerically solving q=1−pQ(m,λ) and
• K
• 0
• =
• 1
• -
• ɛ
• 1
• /
• F
• 1
• -
• ɛ
• ⁢
• λ
• *
• ⁢
• n
• to optimise λ* where 1−q is the proportion of terminals that succeed in transmitting in a frame and Q is the gamma function, K0 is the number of new terminals that enter the field of view each frame, F is the number of frames a terminal is in the field of view for, λ=k/n and k=pK and where K is the number of active terminals in the field of view.

A multiple access wireless communication system comprising:

• a plurality of terminals;
• a multi-access receiver;
• and
• a network operations center in communication with the multi-access receiver,
• wherein the multi-access receiver comprises:
• a receiver for simultaneously receive m transmissions in each slot of a frame;
• and
• a multiuser decoder for decoding the received transmissions, each terminal comprises:
• a transmitter configured to transmit a message during a slot of a frame to the multi-access receiver when in an active state,
• a memory, and
• a multi-access receiver processor,
• wherein when the terminal is in an active state the transmitter is permitted to transmit a message and when the terminal is in an inactive state the transmitter is prevented from transmitting, and the memory stores a probability of transmission p which during an active state, the multi-access receiver processor uses to determine whether to transmit in a frame, and
• the network operations center comprises:
• a network operations center processor configured to perform a method for optimizing a network parameter in a set of network parameters, wherein the network parameters comprise (p, n, m, ε) where p is the probability of an active terminal deciding to transmit in a frame, n is the number of slots per frame, m is the number of simultaneous transmissions that a multiuser can successfully decode in a single slot, and E is the probability of failure of a terminal to successfully transmit a message whilst in a field of view of the multiple access receiver, and the method of optimising a network parameter comprising:
• selecting the network parameter and numerically solving q=1−pQ(m,λ) and
• K
• 0
• =
• 1
• -
• ɛ
• 1
• /
• F
• 1
• -
• ɛ
• ⁢
• λ
• *
• ⁢
• n
• to optimise λ* where 1−q is the proportion of terminals that succeed in transmitting in a frame and Q is the gamma function, K0 is the number of new terminals that enter the field of view each frame, F is the number of frames a terminal is in the field of view for, λ=k/n and k=pK and where K is the number of active terminals in the field of view;
• and
• communicating the optimized network parameter to the multi-access receiver for transmission to the plurality of terminals.