Handling of inactive parameters upon release and re-suspend
Systems and methods are disclosed herein for updating stored User Equipment (UE) context information upon re-suspend of the UE in response to a resume request from the UE. In some embodiments, a method in a UE comprises transmitting a Radio Resource Control (RRC) resume request message and, in response to the RRC resume request message, receiving an RRC connection release message with an indication for suspend. The method further comprises, in response to receiving the RRC connection release message with an indication for suspend, replacing information in a stored Access Stratum (AS) context of the UE with new information.
1. A method, implemented by a User Equipment (UE) or network node, the method comprising:
exchanging Radio Resource Control (RRC) messaging between the UE and the network node, the RRC messaging comprising an RRC connection release message comprising a suspend indication; and
replacing information in a stored Access Stratum (AS) context of the UE with new information comprised in the RRC connection release message.
2. The method of claim 1 , wherein replacing the information comprises replacing:
a stored cell identity with a cell identity of a cell in which the UE received the RRC connection release message;
a stored physical cell identity with a physical cell identity of the cell in which the UE received the RRC connection release message; and
a stored Cell Radio Network Temporary Identifier (C-RNTI) with a C-RNTI obtained by the UE for the cell in which the UE received the RRC connection release message.
3. The method of claim 1 , wherein:
replacing the information comprises replacing stored security context information with security context information comprised in the RRC connection release message; and
the security context information comprises a next hop chaining count.
4. The method of claim 1 , wherein replacing the information comprises replacing a stored Inactive Radio Network Temporary Identifier (I-RNTI) with an I-RNTI comprised in the RRC connection release message.
5. The method of claim 1 , wherein replacing the information comprises replacing a stored C-RNTI with a C-RNTI obtained by the UE for a cell in which the UE received the RRC connection release message.
6. The method of claim 5 , wherein the C-RNTI is a temporary C-RNTI.
7. The method of claim 1 , wherein replacing the information comprises replacing a stored cell identity with a cell identity of a cell in which the UE received the RRC connection release message.
8. The method of claim 1 , wherein:
replacing the information provides an updated AS context of the UE; and
the RRC messaging further comprises a subsequent RRC resume request that uses the updated AS context of the UE, wherein the subsequent RRC resume request is from the UE to the network node.
9. The method of claim 8 , wherein the subsequent RRC resume request comprises a security integrity token derived from the updated AS context of the UE.
10. The method of claim 1 , wherein replacing the information comprises replacing a stored physical cell identity with a physical cell identity of a cell in which the UE received the RRC connection release message.
11. A network device, wherein the network device is either a User Equipment (UE) or a network node, the network device comprising:
a radio interface; and
processing circuitry associated with the radio interface, wherein the processing circuitry is configured to cause the network device to:
exchange Radio Resource Control (RRC) messaging between the UE and the network node, the RRC messaging comprising an RRC connection release message comprising a suspend indication; and
replace information in a stored Access Stratum (AS) context of the UE with new information comprised in the RRC connection release message.
12. The network device of claim 11 , wherein to replace the information in the stored AS context of the UE, the network device is configured to replace:
a stored cell identity with a cell identity of a cell in which the UE received the RRC connection release message;
a stored physical cell identity with a physical cell identity of the cell in which the UE received the RRC connection release message; and
a stored Cell Radio Network Temporary Identifier (C-RNTI) with a C-RNTI obtained by the UE for the cell in which the UE received the RRC connection release message.
13. The network device of claim 11 , wherein:
to replace the information in the stored AS context of the UE, the network device is configured to replace stored security context information with security context information comprised in the RRC connection release message; and
the security context information comprises a next hop chaining count.
14. The network device of claim 11 , wherein to replace the information in the stored AS context of the UE, the network device is configured to replace a stored Inactive Radio Network Temporary Identifier (I-RNTI) with an I-RNTI comprised in the RRC connection release message.
15. The network device of claim 11 , wherein to replace the information in the stored AS context of the UE, the network device is configured to replace a stored C-RNTI with the C-RNTI obtained by the UE for a cell in which the UE received the RRC connection release message.
16. The network device of claim 15 , wherein the C-RNTI is a temporary C-RNTI.
17. The network device of claim 11 , wherein to replace the information in the stored AS context of the UE, the network device is configured to replace a stored cell identity with a cell identity of a cell in which the UE received the RRC connection release message.
18. The network device of claim 11 , wherein:
replacing the information provides an updated AS context of the UE; and
the RRC messaging further comprises a subsequent RRC resume request that uses the updated AS context of the UE, wherein the subsequent RRC resume request is from the UE to the network node.
19. The network device of claim 18 , wherein the subsequent RRC resume request comprises a security integrity token derived from the updated AS context of the UE.
20. The network node of claim 11 , wherein to replace the information in the stored AS context of the UE, the network device is configured to replace a stored physical cell identity with a physical cell identity of a cell in which the UE received the RRC connection release message.
21. A non-transitory computer readable medium storing a computer program product for controlling a network device in a wireless communication network, the network device being a User Equipment (UE) or network node and the computer program product comprising software instructions that, when run on the network device, cause the network device to:
exchange Radio Resource Control (RRC) messaging between the UE and the network node, the RRC messaging comprising an RRC connection release message comprising a suspend indication; and
replace information in a stored Access Stratum (AS) context of the UE with new information comprised in the RRC connection release message.