# US 2017/0290084 A1 · Device and Method of Handling User Plane Evolved Packet System Optimization Procedure > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2017/0290084 A1 - Document ID: US20170290084A1 - Status: Published application - Kind: A1 - Application number: 15/475,091 - Filed: 2017-03-30 - Published: 2017-10-05 - Earliest claimed: 2016-04-01 - Assignees: HTC Corporation - Applicants: HTC Corporation - Inventors: Chih-Hsiang Wu; Te-Ming Chen - Web page: https://patentgrep.com/patent/US20170290084A1 ## CPC - H04W 76/27: Transitions between radio resource control [RRC] states - H04W 36/20: for optimising the interference level - H04W 76/10: Connection setup - H04W 76/30: Connection release - H04W 48/12: using downlink control channel - 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 User Plane Evolved Packet System (EPS) Optimization 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 a RRC layer of the communication device receiving system information from a cell of a network; the RRC layer informing an EPS mobility management (EMM) layer of the communication device that a User Plane EPS Optimization functionality (e.g., a resume/suspend functionality) is allowed in the cell, when the system information indicates that the User Plane EPS Optimization functionality is allowed; and the RRC layer informing the EMM layer that the User Plane EPS Optimization functionality is not allowed in the cell, when the system information indicates that the User Plane EPS Optimization functionality is not allowed. ## Claims ### Claim 1 A communication device for handling a User Plane Evolved Packet System (EPS) Optimization procedure, comprising: a storage unit, for storing instructions of: a radio resource control (RRC) layer of the communication device receiving system information from a cell of a network; the RRC layer informing an EPS mobility management (EMM) layer of the communication device that a User Plane EPS Optimization functionality is allowed in the cell, when the system information indicates that the User Plane EPS Optimization functionality is allowed; and the RRC layer informing the EMM layer that the User Plane EPS Optimization functionality is not allowed in the cell, when the system information indicates that the User Plane EPS Optimization functionality is not allowed; 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 storage unit further stores the instruction of: the EMM layer indicating the RRC layer to perform a RRC connection establishment procedure if the EMM layer initiates a procedure to transmit an EMM message or data, after the EMM layer is informed by the RRC layer that the User Plane EPS Optimization functionality is not allowed in the cell. ### Claim 3 (depends on 1) The communication device of claim 1, wherein the storage unit further stores an instruction of: the EMM layer indicating the RRC layer to perform a RRC connection resume procedure if the EMM layer initiates a procedure to transmit an EMM message or data, after the EMM layer is informed by the RRC layer that the User Plane EPS Optimization functionality is allowed in the cell. ### Claim 4 (depends on 1) The communication device of claim 1, wherein the RRC layer informs the EMM layer whether the User Plane EPS Optimization functionality is allowed in the cell, when a RRC connection is suspended and the RRC layer receives the system information or when the EMM layer requests the RRC layer to report a state of the User Plane EPS Optimization functionality. ### Claim 5 (depends on 4) The communication device of claim 4, wherein the RRC layer reacquires the system information to determine whether the User Plane EPS Optimization functionality is allowed in the cell, after the EMM layer requests the RRC layer to report the state of the User Plane EPS Optimization functionality, before the RRC layer transmits an indication to the EMM layer. ### Claim 6 (depends on 1) The communication device of claim 1, wherein the RRC layer transmits an indication to the EMM layer according to the system information to indicate whether the User Plane EPS Optimization functionality is allowed in the cell. ### Claim 7 (depends on 1) The communication device of claim 1, wherein the EMM layer enters an EMM_IDLE without suspend indication state, after receiving an indication from the RRC layer for indicating that the User Plane EPS Optimization functionality is not allowed in the cell. The EMM layer enters an EMM_IDLE with suspend indication state, after receiving an indication from the RRC layer for indicating that the User Plane EPS Optimization functionality is allowed in the cell. ### Claim 8 (depends on 1) The communication device of claim 1, wherein the EMM layer in an EMM_IDLE state requests the RRC layer to resume a RRC connection, when the EMM layer initiates a service request procedure or an extended service request procedure. ### Claim 9 A communication device for handling a User Plane Evolved Packet System (EPS) Optimization procedure, comprising: a storage unit, for storing instructions of: a radio resource control (RRC) layer of the communication device receiving system information from a cell of a network; an EPS mobility management (EMM) layer of the communication device requesting the RRC layer to perform a RRC connection resume procedure, by transmitting a resume request to the RRC layer; the RRC layer transmitting a RRC connection resume request message to the network, if a RRC connection is suspended and the system information indicating that a User Plane EPS Optimization functionality is allowed in the cell, when the RRC layer receives the resume request from the EMM layer; and the RRC layer transmitting a RRC Connection Request message to the network, if the RRC connection is suspended and the system information indicating that the User Plane EPS Optimization functionality is not allowed in the cell, when the RRC layer receives the resume request from the EMM layer; and a processing circuit, coupled to the storage unit, configured to execute the instructions stored in the storage unit. ### Claim 10 (depends on 9) The communication device of claim 9, wherein the RRC layer reacquires the system information to determine whether the User Plane EPS Optimization functionality is allowed in the cell, before transmitting the RRC connection resume request message or the RRC Connection Request message to the network, after receiving the resume request from the EMM layer, or after receiving a RRC connection suspended request message from the network. ### Claim 11 (depends on 9) The communication device of claim 9, wherein the RRC layer performs a cell selection/reselection procedure, and the RRC layer transmits the RRC connection resume request message to the network, after the communication device switches to a serving cell supporting the User Plane EPS Optimization functionality. ### Claim 12 (depends on 9) The communication device of claim 9, wherein the RRC layer informs the EMM layer that the User Plane EPS Optimization functionality is not allowed in the cell, when the RRC layer transmits the RRC Connection Request message to the network. ### Claim 13 (depends on 9) The communication device of claim 9, wherein the RRC layer determines that the User Plane EPS Optimization functionality is not allowed in the cell, after receiving the resume request from the EMM layer and no RRC connection is suspended. ### Claim 14 (depends on 9) The communication device of claim 9, wherein the RRC layer transmits the RRC Connection Request message to the network, after the RRC layer informs the EMM layer that the User Plane EPS Optimization functionality is not allowed in the cell and receives a connection request from the EMM layer for requesting the RRC layer to perform a RRC connection establishment procedure to the network. ### Claim 15 (depends on 9) The communication device of claim 9, wherein the RRC layer releases a context of the communication device, when the RRC layer receives the system information indicating that the User Plane EPS Optimization functionality is not allowed in the cell, when the EMM layer transmits the RRC connection request message to the RRC layer, when the RRC layer receives a RRC connection setup message from the network, or when the RRC layer receives a RRC resume reject message from the network.