# US 11,445,355 B2 · RRC inactive state optimization

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- Number: US 11,445,355 B2
- Document ID: US11445355B2
- Status: Granted
- Kind: B2
- Application number: 16/324,861
- Filed: 2018-12-26
- Published: 2021-10-28
- Granted: 2022-09-13
- Earliest claimed: 2018-01-12
- Assignees: NEC Corporation
- Applicants: NEC Corporation
- Inventors: Iskren Ianev; Sivasubramaniam Ramanan; Toshiyuki Tamura; Hassan Al-Kanani
- Web page: https://patentgrep.com/patent/US11445355B2

## CPC

- H04W 8/08: Mobility data transfer
- H04W 52/0258: {controlling an operation mode according to history or models of usage information, e.g. activity schedule or time of day}
- H04W 48/16: Discovering, processing access restriction or access information
- H04W 64/006: {with additional information processing, e.g. for direction or speed determination}
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

A core network node for mobility management includes a means for transmitting information related to expected mobility of user equipment, UE, to an access network node.

## Claims

### Claim 1

A mobility management method executed by an Access and Mobility Management Function (AMF) node, the mobility management method comprising:
retrieving an expected User Equipment (UE) behavior parameter from a data management node; and
sending, to a radio access network (RAN), a message for N2 connection between the AMF node and the RAN based on the expected UE behavior parameter, wherein the message comprises assistance information for controlling radio resource control (RRC) Inactive state transitions in the RAN,
wherein the assistance information comprises expected UE moving trajectory information indicating the UE's expected movement and UE mobility information indicating whether the UE is stationary or mobile.

### Claim 2 (depends on 1)

The mobility management method according to claim 1, wherein the expected UE moving trajectory information includes information of a list of cells.

### Claim 3 (depends on 1)

The mobility management method according to claim 1, wherein the expected UE moving trajectory information is used by the RAN for RAN Notification Area (RNA) configuration.

### Claim 4 (depends on 3)

The mobility management method according to claim 3, wherein the RNA configuration includes a size of an RNA.

### Claim 5

A mobility management method executed by a radio access node (RAN), the mobility management method comprising:
receiving, from an Access and Mobility Management Function (AMF) node that retrieves an expected User Equipment (UE) behavior parameter from a data management node, a message for N2 connection between the AMF node and the RAN based on the expected UE behavior parameter, wherein the message comprises assistance information for controlling radio resource control (RRC) Inactive state transitions in the RAN, and wherein the assistance information comprises expected UE moving trajectory information indicating the UE's expected movement and UE mobility information indicating whether the UE is stationary or mobile.

### Claim 6 (depends on 5)

The mobility management method according to claim 5, wherein the expected UE moving trajectory information includes information of a list of cells.

### Claim 7 (depends on 5)

The mobility management method according to claim 5, wherein the expected UE moving trajectory information indicating a status of UE mobility is used by the RAN for RAN Notification Area (RNA) configuration.

### Claim 8 (depends on 7)

The mobility management method according to claim 7, wherein the RNA configuration includes a size of the RNA.

### Claim 9

An Access and Mobility Management Function (AMF) node, comprising:
a memory storing instructions; and
at least one processor configured to process the instructions to:
retrieve an expected User Equipment (UE) behavior parameter from a data management node, and
send, to a radio access network (RAN), a message for N2 connection between the AMF node and the RAN based on the expected UE behavior parameter, wherein the message comprises assistance information for controlling radio resource control (RRC) Inactive state transitions in the RAN, and wherein the assistance information comprises expected UE moving trajectory information indicating the UE's expected movement and UE mobility information indicating whether the UE is stationary or mobile.

### Claim 10

A radio access network (RAN), comprising:
a memory storing instructions; and
at least one processor configured to process the instructions to:
receive, from an Access and Mobility Management Function (AMF) node that retrieves an expected User Equipment (UE) behavior parameter from a data management node, a message for N2 connection between the AMF node and the RAN, based on the expected UE behavior parameter, wherein the message comprises assistance information for controlling radio resource control (RRC) Inactive state transitions in the RAN, and wherein the assistance information comprises expected UE moving trajectory information indicating the UE's expected movement and UE mobility information indicating whether the UE is stationary or mobile.