Authorization of a communication node to determine a bit rate

1. A method in a first network node, the first network node being one of: i) a policy and charging rules function (PCRF) node, ii) a packet data network gateway (PGW), and iii) a gateway general packet radio service support node (GGSN), the method comprising:

receiving, at the first network node, a trigger message transmitted by a second network node, the trigger message comprising a first user equipment aggregated maximum bit rate (UE-AMBR) and a first rank value (r1) indicating a rank of a second network node;

in response to the trigger message, the first network node: i) obtaining a second rank value (r2) indicating a rank of the first network node, ii) comparing r2 against r1, iii) determining that r2 is greater than r1; and iv) in response to determining that r2 is greater than r1, selecting an authorized UE-AMBR that is different than said first UE-AMBR; and

transmitting, from the first network node to the second network node, a response message comprising the selected authorized UE-AMBR and r2.

2. The method according to claim 1 , wherein

the trigger message further comprises a maximum allowed UE-AMBR, and

the step of selecting the authorized UE-AMBR comprises selecting the authorized UE-AMBR such that the selected authorized UE-AMBR is less than or equal to the maximum allowed UE-AMBR.

3. The method according to claim 1 , wherein the first UE-AMBR is a latest authorized UE-AMBR.

4. The method according to claim 1 , wherein the authorized UE-AMBR is an updated authorized UE-AMBR.

5. A first network device, comprising:

a communication interface for receiving a trigger message transmitted by a second network device; and

a processor configured to:

in response to the trigger message, i) obtain a first rank value identifying a rank of the first network device, ii) select an authorized user equipment aggregated maximum bit rate (UE-AMBR) using the first rank value and iii) transmit the authorized UE-AMBR and the first rank to the second network node, wherein

the trigger message comprises a first UE-AMBR and a second rank value (r2), and using the first rank value (r1) to select the authorized UE-AMBR comprises:

i) comparing r1 against r2,

ii) determining that r1 is greater than r2; and

iii) in response to determining that r2 is greater than r1, selecting an authorized UE-AMBR that is different than said first UE-AMBR.

6. The first network device according to claim 5 , wherein the trigger message further comprises a maximum allowed UE-AMBR; and wherein the maximum allowed UE-AMBR is larger than the selected authorized UE-AMBR.

7. The first network device according to claim 6 , wherein the first UE-AMBR is a latest authorized UE-AMBR.

8. The first network device according to claim 5 , wherein the authorized UE-AMBR is an updated authorized UE-AMBR.

9. A method performed by a mobility management node (MMN), wherein the MMN is one of: a Mobility Management Entity (MME) and a serving general packet radio service support node (SGSN), the method comprising:

the MMN transmitting a first trigger message;

the MMN receiving, in response to the first trigger message, a first response message transmitted by a first network node, the first response message comprising a first authorized user equipment-aggregated maximum bit rate (UE-AMBR) and a first rank value identifying a rank of the first network node;

the MMN transmitting a second trigger message, the second trigger message comprising the first UE-AMBR and the first rank value identifying the rank of the first network node; and

the MMN receiving, in response to the second trigger message, a second response message transmitted by a second network node, the second response message comprising a second UE-AMBR and a second rank identifying the rank of the second network node, wherein the second UE-AMBR is greater than the first UE-AMBR and the second rank is greater than the first rank.

10. The method of claim 9 , wherein the first network node is one of: i) a policy and charging rules function (PCRF) node, ii) a packet data network gateway (PGW), and iii) a gateway general packet radio service support node (GGSN).

11. The method according to claim 1 , wherein the trigger message is one of: i) a Create Session Request and ii) a Create PDP Context Request.

12. The first network device according to claim 5 , wherein the trigger message is one of: i) a Create Session Request and ii) a Create PDP Context Request.

13. The method of claim 9 , wherein the trigger message is one of: i) a Create Session Request and ii) a Create PDP Context Request.

14. The method according to claim 1 , wherein the first UE-AMBR is a static value defined by an operator.

15. The first network device according to claim 5 , wherein the first UE-AMBR is a static value defined by an operator.

16. The method of claim 1 , wherein monitoring the second UE-AMBR is a static value defined by an operator.