Coexistence of multiple air interface side-links on a channel
Various arrangements for using multiple air interfaces on a frequency channel for side-link communications are presented. A first indication of a first time-window of a first resource pool may be transmitted by a first air interface system. A second indication of a second time-window of a second resource pool may be transmitted by a second air interface system. Side-link communications may be performed using the first air interface during only the first time-window of the first resource pool. Side-link communications may be performed using the second air interface during only the second time-window of the second resource pool.
1. A method for using multiple air interfaces on a frequency channel for side-link communications, the method comprising:
determining, by an air interface coordination management server system, an allocation of a system resource pool among multiple different air interfaces such that a first air interface is assigned a first time-window of a frequency channel of the system resource pool and a second air interface is assigned a second time-window of the frequency channel of the system resource pool, wherein:
the first time-window and the second time-window do not overlap; and
the system resource pool periodically repeats;
transmitting a first indication of the first time-window of the system resource pool to a first air interface system by the air interface coordination management server system, wherein the first air interface system is in communication with a first cellular network that uses the first air interface;
transmitting a second indication of the second time-window of the system resource pool to a second air interface system by the air interface coordination management server system, wherein the second air interface system is in communication with a second cellular network that uses the second air interface;
transmitting, by the first air interface system, the first indication of the first time-window of the system resource pool to a first set of user equipment using the first air interface via the first cellular network;
transmitting, by the second air interface system, the second indication of the second time-window of the system resource pool to a second set of user equipment using the second air interface via the second cellular network;
performing, by the first set of user equipment, side-link communications using the first air interface during only the first time-window of the system resource pool; and
performing, by the second set of user equipment, side-link communications using the second air interface during only the second time-window of the system resource pool.
2. The method for using multiple air interfaces on the frequency channel for side-link communications of claim 1 , wherein the first air interface is a 4G LTE air interface.
3. The method for using multiple air interfaces on the frequency channel for side-link communications of claim 2 , wherein the second air interface is a 5G NR air interface.
4. The method for using multiple air interfaces on the frequency channel for side-link communications of claim 3 , wherein the first air interface uses a first subcarrier spacing and the second air interface uses a second subcarrier spacing that is different from the first subcarrier spacing.
5. The method for using multiple air interfaces on the frequency channel for side-link communications of claim 1 , wherein the side-link communications are selected from a group consisting of:
vehicle to vehicle communications;
vehicle to infrastructure communications; and
vehicle to pedestrian communications.
6. The method for using multiple air interfaces on the frequency channel for side-link communications of claim 1 , wherein the side-link communications comprise basic safety messages (BSMs).
7. The method for using multiple air interfaces on the frequency channel for side-link communications of claim 6 , wherein each BSM comprises: vehicle size data, position data, speed data, heading data, acceleration data, and brake system status data.
8. The method for using multiple air interfaces on the frequency channel for side-link communications of claim 1 , further comprising:
receiving, by the air interface coordination management server system, one or more reports of communication traffic on the first time-window, the second time-window, or both.
9. The method for using multiple air interfaces on the frequency channel for side-link communications of claim 8 , further comprising:
re-determining, by the air interface coordination management server system, the allocation of the system resource pool among multiple different air interfaces based on the one or more reports of communication traffic.
10. The method for using multiple air interfaces on the frequency channel for side-link communications of claim 1 , further comprising:
transmitting, by the second air interface system, an indication of a subcarrier spacing to be used during the second time-window of the system resource pool to the second set of user equipment using the second air interface, wherein no indication of subcarrier spacing is transmitted to the first set of user equipment using the first air interface.
11. The method for using multiple air interfaces on the frequency channel for side-link communications of claim 10 , wherein subcarrier spacing of the second air interface is variable but subcarrier spacing of the first air interface is fixed.
12. A system that uses multiple air interfaces on a frequency channel for side-link communications, the system comprising:
an air interface coordination management server system that determines an allocation of a system resource pool among multiple different air interfaces such that a first air interface is assigned a first resource pool having a first time-window of a frequency channel and a second air interface is assigned a second resource pool having a second time-window of the frequency channel, wherein:
the first time-window and the second time-window do not overlap; and
the system resource pool periodically repeats;
a first air interface system that receives an indication of the first time-window from the air interface coordination management server system and transmits, via a first cellular network, the indication of the first time-window to a first plurality of user equipment that communicate using the first air interface;
a second air interface system that receives an indication of the second time-window from the air interface coordination management server system and transmits, via a second cellular network, the indication of the second time-window to a second plurality of user equipment that communicate using the second air interface;
the first plurality of user equipment that perform side-link communications using the first air interface during only the first time-window of the first resource pool; and
the second plurality of user equipment that perform side-link communications using the second air interface during only the second time-window of the second resource pool.
13. The system that uses multiple air interfaces on the frequency channel for side-link communications of claim 12 , wherein the first air interface is a 4G LTE air interface.
14. The system that uses multiple air interfaces on the frequency channel for side-link communications of claim 13 , wherein the second air interface is a 5G NR air interface.
15. The system that uses multiple air interfaces on the frequency channel for side-link communications of claim 14 , wherein the side-link communications are selected from a group consisting of:
vehicle to vehicle communications;
vehicle to infrastructure communications; and
vehicle to pedestrian communications.
16. The system that uses multiple air interfaces on the frequency channel for side-link communications of claim 15 , wherein the side-link communications comprise basic safety messages (BSMs).
17. The system that uses multiple air interfaces on the frequency channel for side-link communications of claim 16 , wherein subcarrier spacing of the second air interface is variable but subcarrier spacing of the first air interface is fixed.
18. A vehicle system that uses multiple air interfaces on a frequency channel for side-link communications, the vehicle system comprising:
a first air interface component that performs side-link communications using a first air interface;
a second air interface component that performs side-link communications using a second air interface;
a vehicle systems interface; and
one or more processors, configured to:
receive one or more resource pool allocation messages via the first air interface component, the second air interface component, or both, wherein:
the one or more resource pool allocation messages allocate a system resource pool among multiple different air interfaces such that the first air interface is assigned a first resource pool having a first time-window of a frequency channel and the second air interface is assigned a second resource pool having second time-window of the frequency channel;
the first time-window and the second time-window do not overlap; and
the system resource pool periodically repeats;
schedule a first side-link communication using the first air interface component and the first air interface during the first time-window on the frequency channel;
schedule a second side-link communication using the second air interface component and the second air interface during the second time-window on the frequency channel;
perform the first side-link communication during the first time-window on the frequency channel, wherein the first side-link communication uses data obtained from the vehicle systems interface; and
perform the second side-link communication during the second time-window on the frequency channel, wherein the second side-link communication uses data obtained from the vehicle systems interface.
19. The vehicle system that uses multiple air interfaces on the frequency channel for side-link communications of claim 18 , wherein the first air interface is a 4G LTE air interface and the second air interface is a 5G NR air interface.