# US 10,485,051 B2 · Handling of inactive parameters upon release and re-suspend

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- Number: US 10,485,051 B2
- Document ID: US10485051B2
- Status: Granted
- Kind: B2
- Application number: 16/386,148
- Filed: 2019-04-16
- Published: 2019-10-17
- Granted: 2019-11-19
- Earliest claimed: 2018-04-16
- Assignees: Telefonaktiebolaget LM Ericsson (publ)
- Applicants: Telefonaktiebolaget Lm Ericsson (Publ)
- Inventors: Gunnar Mildh; Icaro L. J. da Silva
- Web page: https://patentgrep.com/patent/US10485051B2

## CPC

- H04W 76/27: Transitions between radio resource control [RRC] states
- H04W 68/005: {Transmission of information for alerting of incoming communication}
- H04W 76/11: Allocation or use of connection identifiers
- H04W 76/19: Connection re-establishment
- H04W 76/30: Connection release
- Y02D 30/70: in wireless communication networks
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE

## Abstract

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.

## Claims

### Claim 1

A method in a User Equipment, UE, comprising:
transmitting a Radio Resource Control, RRC, resume request message;
in response to the RRC resume request message, receiving an RRC connection release message with an indication for suspend; and
in response to receiving the RRC connection release message with the indication for suspend, replacing information in a stored Access Stratum, AS, context of the UE with new information, wherein replacing the information in the stored AS context of the UE comprises:
replacing stored security context information with security context information comprised in the RRC connection release message;
replacing a stored Inactive Radio Network Temporary Identifier, I-RNTI, with an I-RNTI comprised in the RRC connection release message;
replacing a stored cell identity with a cell identity of a cell in which the UE sent the RRC resume request message and received the RRC connection release message;
replacing a stored physical cell identity with a physical cell identity of the cell in which the UE sent the RRC resume request message and received the RRC connection release message; and
replacing a stored Cell Radio Network Temporary Identifier, C-RNTI, with a C-RNTI obtained by the UE for the cell in which the UE sent the RRC resume request message and received the RRC connection release message.

### Claim 2 (depends on 1)

The method of claim 1, wherein the security context information comprises a next hop chaining count.

### Claim 3 (depends on 1)

The method of claim 1 further comprising, after replacing the information in the stored AS context of the UE to provide an updated AS context of the UE, using the updated AS context of the UE to send a subsequent RRC resume request.

### Claim 4 (depends on 3)

The method of claim 3 wherein using the updated AS context of the UE to send the subsequent RRC resume request comprises using the updated AS context to calculate a security integrity token comprised in the subsequent RRC resume request.

### Claim 5

A User Equipment, UE, comprising:
a radio interface; and
processing circuitry associated with the radio interface, wherein the processing circuitry is configured to cause the UE to:
transmit a Radio Resource Control, RRC, resume request message;
in response to the RRC resume request message, receive an RRC connection release message with an indication for suspend; and
in response to receiving the RRC connection release message with the indication for suspend, replace information in a stored Access Stratum, AS, context of the UE with new information wherein, to replace the information in the stored AS context of the UE, the processing circuitry is configured to cause the UE to:
replace stored security context information with security context information comprised in the RRC connection release message;
replace a stored Inactive Radio Network Temporary Identifier, I-RNTI, with an I-RNTI comprised in the RRC connection release message;
replace a stored cell identity with a cell identity of a cell in which the UE sent the RRC resume request message and received the RRC connection release message;
replace a stored physical cell identity with a physical cell identity of the cell in which the UE sent the RRC resume request message and received the RRC connection release message; and
replace a stored Cell Radio Network Temporary Identifier, C-RNTI, with a C-RNTI obtained by the UE for the cell in which the UE sent the RRC resume request message and received the RRC connection release message.

### Claim 6 (depends on 5)

The UE of claim 5, wherein the security context information comprises a next hop chaining count.

### Claim 7

A network node for updating a User Equipment, UE, Access Stratum, AS, context stored for a UE upon re-suspending the UE in response to a Radio Resource Control, RRC, resume request from the UE, the network node comprising:
processing circuitry configured to cause the network node to:
receive, from a UE, a RRC resume request message;
in response to receiving the RRC resume request message, transmit, to the UE, an RRC connection release message with an indication for suspend; and
in response to transmitting the RRC connection release message with the indication for suspend, replace information in a stored AS context of the UE with new information, wherein, to replace the information in the stored AS context of the UE, the processing circuitry is configured to cause the network node to:
replace stored security context information with security context information comprised in the RRC connection release message;
replace a stored Inactive Radio Network Temporary Identifier, I-RNTI, with an I-RNTI comprised in the RRC connection release message;
replace a stored cell identity with a cell identity of a cell in which the UE sent the RRC resume request message and received the RRC connection release message;
replace a stored physical cell identity with a physical cell identity of the cell in which the UE sent the RRC resume request message and received the RRC connection release message; and
replace a stored Cell Radio Network Temporary Identifier, C-RNTI, with a C-RNTI obtained by the UE for the cell in which the UE sent the RRC resume request message and received the RRC connection release message.

### Claim 8 (depends on 7)

The network node of claim 7,
wherein the security context information comprises a next hop chaining count.

### Claim 9

A method of operating a network node for updating a User Equipment, UE, Access Stratum, AS, context stored for a UE upon re-suspending the UE in response to a Radio Resource Control, RRC, resume request from the UE, the method comprising:
receiving, from a UE, a RRC resume request message;
in response to receiving the RRC resume request message, transmitting, to the UE, an RRC connection release message with an indication for suspend; and
in response to transmitting the RRC connection release message with the indication for suspend, replacing information in a stored AS context of the UE with new information, wherein replacing the information in the stored AS context of the UE comprises:
replacing stored security context information with security context information comprised in the RRC connection release message;
replacing a stored Inactive Radio Network Temporary Identifier, I-RNTI, with an I-RNTI comprised in the RRC connection release message;
replacing a stored cell identity with a cell identity of a cell in which the UE sent the RRC resume request message and received the RRC connection release message;
replacing a stored physical cell identity with a physical cell identity of the cell in which the UE sent the RRC resume request message and received the RRC connection release message; and
replacing a stored Cell Radio Network Temporary Identifier, C-RNTI, with a C-RNTI obtained by the UE for the cell in which the UE sent the RRC resume request message and received the RRC connection release message.

### Claim 10 (depends on 9)

The method of claim 9, wherein the security context information comprises a next hop chaining count.