# US 2021/0243653 A1 · User equipment and wireless communication method for network slicing > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0243653 A1 - Document ID: US20210243653A1 - Status: Published application - Kind: A1 - Application number: 17/236,300 - Filed: 2021-04-21 - Published: 2021-08-05 - Earliest claimed: 2017-03-29 - Assignees: FG Innovation Company Limited - Applicants: FG Innovation Company Limited - Inventors: MEI-JU SHIH; CHIE-MING CHOU; YUNG-LAN TSENG; CHIA-HUNG WEI - Web page: https://patentgrep.com/patent/US20210243653A1 ## CPC - H04W 28/16: Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service] - H04W 48/14: using user query {or user detection} - H04W 76/10: Connection setup - H04W 88/06: adapted for operation in multiple networks {or having at least two operational modes}, e.g. multi-mode terminals - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A wireless communication method performed by a user equipment (UE) is provided. The wireless communication method includes transmitting, to a first base station, a radio resource control (RRC) message indicating a requested network slice, the RRC message including a UE identifier (ID) and single network slice selection assistance information (S-NSSAI); receiving, from the first base station, a network slice response indicating the requested network slice is rejected and a cause of the rejection; and establishing a first RRC connection with the first base station. ## Claims ### Claim 1 A wireless communication method performed by a user equipment (UE), the method comprising: transmitting, to a first base station, a radio resource control (RRC) message indicating a requested network slice, the RRC message including a UE identifier (ID) and single network slice selection assistance information (S-NSSAI); receiving, from the first base station, a network slice response indicating the requested network slice is rejected and a cause of the rejection; and establishing a first RRC connection with the first base station. ### Claim 2 (depends on 1) The wireless communication method of claim 1, wherein the network slice response is generated by an Access and Mobility Management Function (AMF) in response to the S-NSSAI. ### Claim 3 (depends on 1) The wireless communication method of claim 1, further comprising: establishing a second RRC connection with a second base station as a secondary node while maintaining the first RRC connection with the first base station. ### Claim 4 (depends on 3) The wireless communication method of claim 3, further comprising: determining that the second base station does not support the requested network slice. ### Claim 5 (depends on 1) The wireless communication method of claim 1, further comprising: performing a mobility management procedure to connect with a second base station supporting the requested network slice. ### Claim 6 A user equipment (UE), comprising: a processor; and a memory coupled to the processor, the memory storing a computer-executable program that when executed by the processor, causes the processor to: transmit, to a first base station, a radio resource control (RRC) message indicating a requested network slice, the RRC message including a UE identifier (ID) and single network slice selection assistance information (S-NSSAI); receive, from the first base station, a network slice response indicating the requested network slice is rejected and a cause of the rejection; and establish a first RRC connection with the first base station. ### Claim 7 (depends on 6) The UE of claim 6, wherein the network slice response is generated by an Access and Mobility Management Function (AMF) in response to the S-NSSAI. ### Claim 8 (depends on 6) The UE of claim 6, wherein the computer-executable program, when executed by the processor, further causes the processor to establish a second RRC connection with a second base station as a secondary node while maintaining the first RRC connection with the first base station. ### Claim 9 (depends on 8) The UE of claim 8, wherein the computer-executable program, when executed by the processor, further causes the processor to determine that the second base station does not support the requested network slice. ### Claim 10 (depends on 6) The UE of claim 6, wherein the computer-executable program, when executed by the processor, further causes the processor to perform a mobility management procedure to connect with a second base station supporting the requested network slice. ### Claim 11 A wireless communication method, comprising: receiving, by a first base station, a radio resource control (RRC) message indicating a requested network slice from a user equipment (UE), the RRC message including a UE identifier (ID) and single network slice selection assistance information (S-NSSAI); transmitting, by the first base station, a network slice response to the UE, the network slice response indicating the requested network slice is rejected and a cause of the rejection; and establishing a first RRC connection between the first base station and the UE. ### Claim 12 (depends on 11) The wireless communication method of claim 11, wherein the network slice response is generated by an Access and Mobility Management Function (AMF) in response to the S-NSSAI. ### Claim 13 (depends on 11) The wireless communication method of claim 11, further comprising: establishing a second RRC connection between the UE and a second base station as a secondary node while maintaining the first RRC connection between the first base station and the UE. ### Claim 14 (depends on 13) The wireless communication method of claim 13, wherein the second base station is determined not to support the requested network slice. ### Claim 15 (depends on 11) The wireless communication method of claim 11, further comprising: selecting, by the first base station, a second base station supporting the requested network slice based on the S-NSSAI; and performing, by the first base station, a mobility management procedure to connect with the second base station. ### Claim 16 (depends on 15) The wireless communication method of claim 15, further comprising: exchanging, by the first base station, control signaling with the second base station, the control signaling including the S-NSSAI. ### Claim 17 (depends on 16) The wireless communication method of claim 16, wherein the control signaling further includes beam information of the second base station.