# US 2017/0290083 A1 · Device and Method of Handling Radio Resource Control Connection Resume Procedure

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- Number: US 2017/0290083 A1
- Document ID: US20170290083A1
- Status: Published application
- Kind: A1
- Application number: 15/472,286
- Filed: 2017-03-29
- Published: 2017-10-05
- Earliest claimed: 2016-04-01
- Assignees: HTC Corporation
- Applicants: HTC Corporation
- Inventors: Kundan Tiwari
- Web page: https://patentgrep.com/patent/US20170290083A1

## CPC

- H04W 76/25: Maintenance of established connections
- H04W 76/19: Connection re-establishment
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

A communication device for handling a radio resource control (RRC) connection resume procedure comprises a storage unit for storing instructions and a processing circuit coupled to the storage unit. The processing circuit is configured to execute the instructions stored in the storage unit. The instructions comprise resuming a RRC connection suspended by a RRC message, when initiating a service request procedure; transmitting a first EXTENDED SERVICE REQUEST message comprising a service type information element (IE) to the network after the RRC connection is resumed, if the service request procedure is initiated for a packet switched (PS) service and the communication device is required to transmit an information element related to the PS service other than the service type IE.

## Claims

### Claim 1

A communication device for handling a radio resource control (RRC) connection resume procedure, comprising:
a storage unit, for storing instructions of:
establishing a RRC connection with a network;
suspending the RRC connection, when receiving a RRC message for suspending the RRC connection;
resuming the RRC connection with the network, when initiating a service request procedure;
transmitting a first EXTENDED SERVICE REQUEST message comprising a service type information element (IE) to the network after the RRC connection is resumed, if the service request procedure is initiated for a packet switched (PS) service and the communication device is required to transmit an IE related to the PS service other than the service type IE; and
a processing circuit, coupled to the storage unit, configured to execute the instructions stored in the storage unit.

### Claim 2 (depends on 1)

The communication device of claim 1, wherein the RRC message comprises a first identifier.

### Claim 3 (depends on 1)

The communication device of claim 1, wherein the first EXTENDED SERVICE REQUEST message comprises the service type IE set to packet services via S1.

### Claim 4 (depends on 1)

The communication device of claim 1, wherein the storage unit further stores the instruction of:
not transmitting a SERVICE REQUEST message to the network after the RRC connection is resumed, if the service request procedure is initiated for the PS service.

### Claim 5 (depends on 1)

The communication device of claim 1, wherein the instruction of establishing the RRC connection with the network comprises:
transmitting a first RRC Connection Request message to the network;
receiving a first RRC Connection Setup message from the network; and
transmitting the RRC Connection Setup Complete message to the network.

### Claim 6 (depends on 1)

The communication device of claim 1, wherein the instruction of suspending the RRC connection comprises:
storing at least one of a RRC configuration, a dedicated radio bearer (DRB) configuration, an access stratum security context, a plurality of layer 1 parameters and a plurality of layer 2 parameters.

### Claim 7 (depends on 1)

The communication device of claim 1, wherein the RRC message comprises a RRC Connection Release message comprising a release cause indicating a suspension of the RRC connection.

### Claim 8 (depends on 1)

The communication device of claim 1, wherein the storage unit further stores the instructions of:
suspending a NAS signaling connection;
transferring to an Evolved Packet Service (EPS) Mobility Management (EMM) IDLE mode; and
not releasing the NAS signaling connection.

### Claim 9 (depends on 1)

The communication device of claim 1, wherein the instruction of resuming the RRC connection when initiating the service request procedure comprises:
transmitting a RRC Connection Resume Request message, a second RRC Connection Request message or a RRC Connection Reestablishment Request message with a second identifier to the network; and
receiving a RRC Connection Resume Complete message, a second RRC Connection Setup message or a RRC Connection Reestablishment Complete message from the network.