Sidelink V2V, V2X, and low-complexity IoT communication in 5G and 6G
Sidelink protocols enable user devices to rapidly find, make contact with, and continue communicating with other user devices. For example, vehicles in traffic can communicate on a low-complexity sidelink channel to cooperatively avoid collisions, saving countless lives. Disclosed protocols also enable mobile and IoT devices to form a self-organized temporary local network, independently of base stations. Example messages include a sidelink hailing message configured to discover other user devices, sidelink reply messages indicating the location or identity of each user device, sidelink semaphore messages indicating when each member enters and exits the temporary local network, and extremely fast low-latency emergency communication between vehicles. The disclosed low-complexity protocols may enable cost-constrained use cases that would remain unfeasible under 5G and 6G requirements, absent the systems and methods disclosed herein. For many IoT devices with limited service requirements, the disclosed low-complexity procedures may be enabling.
1. A first user device configured to:
broadcast a sidelink hailing message to other user devices in range, the sidelink hailing message comprising an identification code of the first user device;
receive one or more sidelink reply messages transmitted by one or more other user devices responsive to the sidelink hailing message, each sidelink reply message comprising an identification code of the replying user device;
record the identification code of each replying user device in computer-readable media; and then
communicate with a specific one of the replying user devices;
detect a message collision between two of the sidelink reply messages;
then delay a predetermined interval; and
then retransmit the sidelink hailing message;
wherein the predetermined interval is in the range of 0.01 to 10 seconds, inclusive.
2. The first user device of claim 1 , wherein the sidelink hailing message is transmitted according to 5G or 6G technology.
3. The first user device of claim 1 , wherein the communicating comprises transmitting a unicast (addressed) message to the specific user device, or receiving a unicast message from the specific user device.
4. The first user device of claim 1 , further configured to select an identification code at random or according to a pseudorandom algorithm, and to include the identification code in the sidelink hailing message.
5. The first user device of claim 4 , wherein the identification code has a predetermined bit length in the range of 8 bits to 16 bits, inclusive.
6. The first user device of claim 1 , further configured to include, in the sidelink hailing message, a code indicating a location of the first user device.