CDMA based reservation channel transmission in V2V communications

A method comprising:

• spreading, by a wireless communication device that is a transmitter node of a vehicle ad-hoc network (VANET), a first reservation channel message with a first orthogonal code to generate an orthogonal spread first reservation channel message, the first reservation channel message identifying a first set of time-frequency resources being reserved for an upcoming data transmission from the wireless communication device to a target wireless communication device that is a target node in the VANET;
• spreading, by the wireless communication device, a second reservation channel message with a second orthogonal code to generate an orthogonal spread second reservation channel message, the second reservation channel message identifying a second set of time-frequency resources being reserved for another upcoming data transmission from the wireless communication device to another target wireless communication device that is another target node in the VANET;
• combining the orthogonal spread first reservation channel message and the orthogonal spread second reservation channel message;
• spreading, by the wireless communication device, the combined orthogonal spread first reservation channel message and orthogonal spread second reservation channel message with a first spreading code, according to a code-division multiple access (CDMA) scheme, to generate a spread combined reservation channel message;
• and
• transmitting, from the wireless communication device to at least one other wireless communication device that is another node of the VANET, a first reservation channel transmission using time-frequency resources selected from a reservation channel resource pool, the time-frequency resources allocated by a network for reservation channel transmissions for reserving data time-frequency resources for data transmissions, the first reservation channel transmission containing the spread combined reservation channel message, which contains the orthogonal spread first reservation channel message and the orthogonal spread second reservation channel message, the orthogonal spread first reservation channel message indicating to the at least one other wireless communication device that the first set of time-frequency resources are being reserved for the upcoming data transmission from the wireless communication device to the target wireless communication device, the orthogonal spread second reservation channel message indicating to the at least one other wireless communication device that the second set of time-frequency resources are being reserved for the another upcoming data transmission from the wireless communication device to the another target wireless communication device.