Systems and methods for managing priority exceptions for shared spectrum radio services
Systems and methods for managing priority exceptions for shared spectrum radio services are provided. In one embodiment, a shared spectrum radio services system comprises: a spectrum access system (SAS) configured to adjust transmit power levels of one or more radios, wherein the one or more radios transmit on a protected frequency of a shared spectrum, wherein the SAS is associated with a protection area that comprises at least one dynamic incumbent RF system that transmits on the protected frequency; and wherein the SAS applies a standard transmit expiration time parameter to the one or more radios, the standard transmit expiration time parameter indicating a time of day at which authorization to transmit on the protected frequency expires; and wherein the SAS is configured to execute a transmit expiration parameter exception protocol to override the standard transmit expiration time parameter for at least one of the one or more radios.
1. A method for managing priority exceptions for a shared spectrum radio services system, the shared spectrum radio services system comprising a spectrum access system (SAS) configured to manage one or more radios that transmit on a protected frequency of a shared spectrum, wherein at least one dynamic incumbent radio operates on the protected frequency, the method comprising:
transmitting from a radio one or more signals on the protected frequency of the shared spectrum while a current time is prior to a time indicated by a standard transmit expiration time parameter received from the SAS;
receiving an authorization to enable a parameter exception protocol;
monitoring a communications connection between the radio and the SAS; and
when the communications connection is determined to be interrupted:
executing the parameter exception protocol; and
overriding the standard transmit expiration time parameter received from the SAS and transmit from the radio the one or more signals on the protected frequency based on the parameter exception protocol.
2. The method of claim 1 , wherein the parameter exception protocol defines a transmit expiration time exception parameter.
3. The method of claim 2 , wherein the standard transmit expiration time parameter and the transmit expiration time exception parameter each indicate a time of day at which authorization for the radio to transmit expires;
wherein the transmit expiration time exception parameter indicates a time further into the future than the standard transmit expiration time parameter.
4. The method of claim 1 , wherein monitoring a communications connection between the radio and the SAS comprises:
periodically transmitting from the radio a heartbeat request message and monitoring for a heartbeat response message received in reply to the heartbeat request message.
5. The method of claim 4 , further comprising:
determining when the communication connection is interrupted based on either:
when the heartbeat response message is not received within a preset timeout period; or
when the heartbeat response message is not received after transmitting the heartbeat request message a preset number of attempts.
6. The method of claim 1 , wherein the shared spectrum radio services system is a citizen's broadband radio service (CBRS) system, the one or more radios are each citizen broadband radio service devices (CBSDs), and the SAS is a SAS of the CBRS.
7. A radio for a shared spectrum radio services system that comprises a spectrum access system (SAS) configured to adjust transmit power levels of one or more radios that transmit on a protected frequency of a shared spectrum, wherein the SAS is associated with a protection area that comprises at least one dynamic incumbent RF system that transmits on the protected frequency, and wherein the SAS applies a standard transmit expiration time parameter to the one or more radios, the standard transmit expiration time parameter indicating a time of day at which authorization to transmit on the protected frequency expires, the radio comprising:
processor circuitry coupled to memory circuitry;
a radio frequency (RF) transmitter path; and
a RF receiver path;
wherein the processor circuitry is configured to:
receive an authorization to enable a parameter exception protocol;
monitor, using the RF transmitter path and the RF receiver path, a communications connection between the radio and the SAS to determine when the communication connection is determined to be interrupted; and
when the communications connection is determined to be interrupted, execute the parameter exception protocol, wherein the parameter exception protocol instructs the processor circuitry to override the standard transmit expiration time parameter.
8. The radio of claim 7 , wherein the parameter exception protocol defines a transmit expiration time exception parameter and instructs the processor circuitry to utilize the transmit expiration time exception parameter in place of the standard transmit expiration time parameter.
9. The radio of claim 7 , wherein the shared spectrum radio services system is a citizen's broadband radio service (CBRS) system, the one or more radios are each citizen broadband radio service devices (CBSDs), and the SAS is a SAS of the CBRS.