Handling of 5GSM congestion timers

A User Equipment (UE), comprising:

• a receiver that receives a 5G session management (5GSM) message in a mobile communication network, wherein the UE is registered to a public land mobile network (PLMN), wherein the 5GSM message comprises a 5GSM congestion re-attempt indicator, and wherein the 5GSM congestion re-attempt indicator indicates a new backoff (BO) timer applied to all PLMN or the registered PLMN;
• a congestion control circuit that determines whether a backoff (BO) timer is running, wherein the running BO timer is applied for all PLMN or applied for the registered PLMN, wherein
• the congestion control circuit stops the running BO timer in response to the 5GSM message;
• and
• one or more new BO timers that are started after the running BO timer is stopped, in accordance with the 5GSM message where the one or more new BO timer is are provided by the network, and wherein each of the one or more new BO timers and the running BO timer corresponds to a different PLMN type.

A method, comprising:

• receiving a first 5G session management (5GSM) message by a user equipment (UE) in a mobile communication network, wherein the UE is registered to a first public land mobile network (PLMN), wherein the first 5GSM message comprises a 5GSM congestion re-attempt indicator, and wherein the 5GSM congestion re-attempt indicator indicates a new backoff (BO) timer applied to all PLMN or the registered PLMN;
• starting a first BO timer based on a first BO timer value carried in the first 5GSM message, wherein the first BO timer is applied fora first PLMN type;
• receiving a second 5GSM message by the UE and in response stops the first BO timer;
• and
• starting a new BO timer based on a second BO timer value carried in the second 5GSM message, wherein the new BO timer is applied to a second PLMN type, and wherein the first PLMN type and the second PLMN type are different, and wherein the second 5GSM messages carries a 5GSM congestion re-attempt indicator that indicates the second PLMN type.