Hailing procedure for V2R, V2V, and V2X initial contact in 5G and 6G
Low-complexity wireless messaging procedures enable a prospective user device to select and make initial contact with a suitable base station in 5G or 6G networks. In some embodiments, the user device may transmit a short “hailing message”, on a frequency allocated for at-will messaging. The hailing message is configured to elicit a reply message from each base station within range. The base stations delay their responses by different amounts according to the amplitude of the as-received hailing message, the shortest delay for the strongest signal. Since the base station with highest received amplitude responds first, the user device can thereby select the first reply message and communicate with the base station having the best signal. The hailing message thereby enables the user device to select the most suitable base station, acquire its system information, and begin communications, while avoiding the time and complexity involved in searching for that information separately.
1. A wireless network base station containing non-transitory computer-readable media containing instructions that, when executed by a computing environment, cause a method to be performed, the method comprising:
receiving a broadcast hailing message from a user device on a predetermined frequency, the broadcast hailing message indicating that a reply message is requested from one or more base stations;
measuring an amplitude of the broadcast hailing message as received;
calculating a delay time inversely related to the amplitude;
monitoring the predetermined frequency during the delay time;
determining whether a communication to the user device from another base station is detected during the delay time; and
after the delay time, if no communication from another base station to the user device is detected during the delay time, transmitting a reply message to the user device on the predetermined frequency.
2. The base station of claim 1 , the method further comprising:
if a communication from another base station to the user device is detected during the delay time, waiting a predetermined listen-before-talk (LBT) interval, and then, if no further transmissions are detected, transmitting the reply message to the user device on the predetermined frequency.
3. The base station of claim 1 , wherein the reply message specifies a particular frequency or an offset indicating the particular frequency.
4. The base station of claim 3 , wherein the particular frequency is related to a physical broadcast channel or a random access channel of the base station.
5. The base station of claim 1 , wherein the reply message indicates a first frequency and a second frequency different from the first frequency.
6. The base station of claim 1 , wherein the reply message specifies system information of the base station.