Methods and apparatus for managing SCell state during UE suspend/resume
Embodiments include methods performed by a user equipment (UE), for managing the UE's secondary serving cells (SCells) in a wireless network. Such methods include receiving, from a first network node, a message to suspend a connection with the first network node. The connection is via a plurality of configured cells including a primary serving cell (PCell) and one or more SCells, which have respective first SCell states. Such methods also include suspending the connection in response to the suspend message. Such methods also include receiving, from the first network node or a second network node, a message to resume the connection. The resume message includes indication of indication of second SCell states for one or more of the following: the one or more SCells, and one or more further SCells to be added to the configured cells more SCells, and one or more further SCells to be added to the configured cells upon resuming the connection. Embodiments also include complementary methods performed by a wireless network.
1. A method performed by a user equipment (UE) for managing secondary serving cells (SCells) in a wireless network, the method comprising:
suspending the UE's connection with the wireless network in response to a suspend message from the wireless network, wherein:
the connection is via a plurality of configured cells including a primary serving cell (PCell) and one or more SCells, and
the one or more SCells have respective first SCell states prior to the suspension;
receiving from the wireless network a message to resume the connection with the wireless network, wherein the resume message does not indicate states for the one or more SCells upon resuming the connection; and
resuming the connection with the wireless network via the one or more SCells in response to the resume message, including placing each of the one or more SCells in a default state.
2. The method of claim 1 , wherein the default state is one of the following:
activated, deactivated, and dormant.
3. The method of claim 1 , wherein:
the resume message includes a configuration for one or more further SCells to be added to the configured cells upon resuming the connection; and
the configuration indicates states for the one or more further SCells upon resuming the connection.
4. The method of claim 1 , wherein placing each of the one or more SCells in the default state is based on absence from the resume message of an indication of states for the one or more SCells upon resuming the connection.
5. A user equipment (UE) configured to manage secondary serving cells (SCells) in a wireless network, the UE comprising:
radio interface circuitry configured to communicate with the wireless network via one or more cells; and
processing circuitry operably coupled to the radio interface circuitry, wherein the processing circuitry and the radio interface circuitry are configured to:
suspend the UE's connection with the wireless network in response to a suspend message from the wireless network, wherein:
the connection is via a plurality of configured cells including a primary serving cell (PCell) and one or more SCells, and
the one or more SCells have respective first SCell states prior to the suspension;
receive from the wireless network a message to resume the connection with the wireless network, wherein the resume message does not indicate states for the one or more SCells upon resuming the connection; and
resume the connection with the wireless network via the one or more SCells in response to the resume message, including placing each of the one or more SCells in a default state.
6. The UE of claim 5 , wherein the default state is one of the following: activated, deactivated, and dormant.
7. The UE of claim 5 , wherein:
the resume message includes a configuration for one or more further SCells to be added to the configured cells upon resuming the connection; and
the configuration indicates states for the one or more further SCells upon resuming the connection.
8. The UE of claim 5 , wherein the processing circuitry and the radio interface circuitry are configured to place each of the one or more SCells in the default state based on absence from the resume message of an indication of states for the one or more SCells upon resuming the connection.
9. A non-transitory, computer-readable medium storing program instructions that, when executed by processing circuitry of a user equipment (UE) configured to manage secondary serving cells (SCells) in a wireless network, configure the UE to perform the method of claim 1 .
10. A method performed by a wireless network for managing secondary serving cells (SCells) of a user equipment (UE), the method comprising:
sending to the UE a message to suspend a connection with the UE, wherein:
the connection is via a plurality of configured cells including a primary serving cell (PCell) and one or more SCells; and
the SCells have respective first SCell states;
subsequently sending to the UE a message to resume the connection, wherein the resume message does not indicate states for the one or more SCells upon resuming the connection; and
resuming the connection with the UE via the one or more SCells, wherein each of the one or more SCells is in a default state.
11. The method of claim 10 , wherein the default state is one of the following: activated, deactivated, and dormant.
12. The method of claim 10 , wherein:
the resume message includes a configuration for one or more further SCells to be added to the configured cells upon resuming the connection; and
the configuration indicates states for the one or more further SCells upon resuming the connection.
13. The method of claim 10 , wherein each of the one or more SCells is in the default state, upon resuming the connection, based on absence from the resume message of an indication of states for the one or more SCells upon resuming the connection.
14. A wireless network configured to manage secondary serving cells (SCells) of a user equipment (UE), the wireless network comprising one or more network nodes, each network node comprising:
communication interface circuitry configured to communicate with the UE; and
processing circuitry operably coupled to the communication interface circuitry, wherein the processing circuitry and the communication interface circuitry are configured to perform the method of claim 10 .
15. A non-transitory, computer-readable medium storing program instructions that, when executed by processing circuitry of one or more network nodes of a wireless network configured to manage secondary serving cells (SCells) of a user equipment (UE), configure the one or more network nodes to perform the method of claim 10 .