NETWORK SUPPORT FOR DIFFERENTIAL CHARGING FOR DATA USAGE IN LICENSED AND UNLICENSED FREQUENCY BANDS

1 . A method comprising:

receiving, at a policy charging and rules function (PCRF), information indicating tariffs for using at least one unlicensed frequency band and at least one licensed frequency band during a call session associated with a user equipment;

defining, at the PCRF based on the information indicating the tariffs, a policy governing allocation of the at least one licensed frequency band and the at least one unlicensed frequency band to the call session; and

transmitting the policy from the PCRF to a base station that supports wireless connectivity with the user equipment in the at least one unlicensed frequency band and the at least one licensed frequency band.

2 . The method of claim 1 , further comprising:

transmitting, from the PCRF, a request for the information indicating the tariffs in response to the PCRF receiving at least one of a request to establish the call session and a request to modify the call session, and wherein receiving the information indicating the tariffs comprises receiving the information indicating the tariffs in response to transmitting the request.

3 . The method of claim 2 , wherein transmitting the request for the information indicating the tariffs comprises transmitting a request including at least one first attribute-value pair associated with the at least one unlicensed frequency band.

4 . The method of claim 3 , wherein transmitting the policy to the base station comprises transmitting at least one second attribute-value pair associated with the at least one unlicensed frequency band.

5 . The method of claim 4 , wherein the at least one first attribute-value pair and the at least one second attribute-value pair are selected from a group comprising an identifier of the at least one unlicensed frequency band, handover criteria for the at least one unlicensed frequency band, a charging rule for the at least one unlicensed frequency band, an activation time for the policy, and a deactivation time for the policy.

6 . The method of claim 5 , further comprising:

receiving, at the PCRF, a request for a new policy from the base station subsequent to the deactivation time;

defining, at the PCRF, the new policy based on information indicating new data usage tariffs for the at least one unlicensed frequency band and the at least one licensed frequency band, the new data usage tariffs being received in response to the request for the new policy; and

transmitting the new policy from the PCRF to the base station with a new de-activation time.

7 . The method of claim 1 , wherein defining the policy comprises defining a policy indicating that a best effort data transmission is to be handed over from a licensed frequency band to an unlicensed frequency band in response to a data usage tariff for the unlicensed frequency band being less than a data usage tariff for the licensed frequency band, wherein control data for the best effort data transmission is conveyed in the licensed frequency band.

8 . The method of claim 1 , wherein defining the policy comprises defining the policy based on at least one of a signal-to-noise ratio, a received signal strength, a speed or velocity of a user equipment, a location of the user equipment, the tariffs, and ownership of the base station.

9 . A method comprising:

transmitting, from a base station that supports wireless connectivity in at least one licensed frequency band and at least one unlicensed frequency band, a request to establish a call session for a user equipment;

receiving, at the base station from a policy charging and rules function (PCRF), a policy governing allocation of the at least one licensed frequency band and the at least one unlicensed frequency band to the call session, wherein the policy is defined by the PCRF based on data usage tariffs for the at least one licensed frequency band and the at least one unlicensed frequency bands during the call session; and

storing the policy at the base station.

10 . The method of claim 9 , further comprising:

at the base station, selectively allocating the at least one licensed frequency band and the at least one unlicensed frequency band to the call session based on the policy.

11 . The method of claim 10 , wherein selectively allocating the at least one licensed frequency band and the at least one unlicensed frequency band comprises handing over best effort data transmission from a licensed frequency band to an unlicensed frequency band in response to a data usage tariff for the unlicensed frequency band being less than a data usage tariff for the licensed frequency band, wherein control data for the best effort data transmission is conveyed in the licensed frequency band.

12 . The method of claim 9 , further comprising:

at the base station, overriding the policy to selectively allocate the at least one licensed frequency band and the at least one unlicensed frequency band to the call session; and

at the base station, selectively allocating the at least one licensed frequency band and the at least one unlicensed frequency band to the call session based on at least one of a channel condition of the at least one licensed frequency band, a channel condition of the at least one unlicensed frequency band, and a load on the base station.

13 . The method of claim 9 , wherein receiving the policy comprises receiving at least one attribute-value pair associated with the at least one unlicensed frequency band.

14 . The method of claim 13 , wherein the at least one attribute-value pair is selected from a group comprising an identifier of the at least one unlicensed frequency band, handover criteria for the at least one unlicensed frequency band, a charging rule for the at least one unlicensed frequency band, an activation time for the policy, and a deactivation time for the policy.

15 . The method of claim 14 , further comprising:

providing a request to modify the call session subsequent to establishing the call session.

16 . The method of claim 15 , wherein providing the request to modify the call session comprises providing the request to modify the call session in response to at least one of a change in a load on the base station, a change in a channel condition of the at least one licensed frequency band, a change in a channel condition of the at least one unlicensed frequency band, handover of one or more other user equipment, and user input to the user equipment.

17 . The method of claim 14 , further comprising:

providing a request for a new policy subsequent to the deactivation time; and

receiving, in response to the request for the new policy, the new policy with a new de-activation time.

18 . A non-transitory computer readable medium embodying a set of executable instructions, the set of executable instructions to manipulate a processor that is implemented in a policy charging and rules function (PCRF) to:

receive information indicating data usage tariffs for at least one licensed frequency band and at least one unlicensed frequency band during a call session associated with a user equipment;

define, based on the information indicating the data usage tariffs, a policy governing allocation of the at least one licensed frequency band and the at least one unlicensed frequency band to the call session; and

transmit the policy to a base station that supports wireless connectivity with the user equipment in the at least one licensed frequency band and the at least one unlicensed frequency band.

19 . The non-transitory computer readable medium of claim 18 , wherein the set of executable instructions is to manipulate the processor to transmit a request for the information indicating the data usage tariffs in response to receiving a request to establish or modify the call session, and wherein receiving the information indicating the data usage tariffs comprises receiving the information indicating the data usage tariffs in response to transmitting the request.

20 . The non-transitory computer readable medium of claim 18 , wherein the set of executable instructions is to manipulate the processor to define a policy indicating that best effort data transmission is to be handed over from a licensed frequency band to an unlicensed frequency band in response to a data usage tariff for the unlicensed frequency band being less than a data usage tariff for the licensed frequency band.