# US 2019/0246334 A1 · Access control method and apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0246334 A1 - Document ID: US20190246334A1 - Status: Published application - Kind: A1 - Application number: 16/294,641 - Filed: 2019-03-06 - Published: 2019-08-08 - Earliest claimed: 2016-09-07 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Yuan WANG; Fenqin ZHU - Web page: https://patentgrep.com/patent/US20190246334A1 ## CPC - H04W 48/06: based on traffic conditions - H04W 48/02: Access restriction performed under specific conditions - H04W 48/08: Access restriction or access information delivery, e.g. discovery data delivery (signalling during connection H04W76/00) - H04W 48/14: using user query {or user detection} - H04W 48/16: Discovering, processing access restriction or access information - H04W 48/18: Selecting a network or a communication service - H04W 88/02: Terminal devices - H04W 88/08: Access point devices - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract An access control method includes: receiving, by a network device, an access request message from user equipment (UE); determining, by the network device based on the access request message, a network slice that the UE requests to access; and when the network device determines to reject an access request of the UE for accessing the network slice, returning, by the network device, a rejection response message to the UE, where the rejection response message includes back-off condition information, and the back-off condition information indicates a condition under which the UE requests again to access the network slice. ## Claims ### Claim 1 An access control method, comprising: receiving, by a network device, an access request from a user equipment (UE); determining, by the network device, based on the access request, a network slice corresponding to the access request; determining, by the network device, whether to reject the access request; and in response to the network device determining to reject the access request, returning, by the network device, a rejection response message to the UE, wherein the rejection response message comprises back-off condition information indicating a condition for the UE to re-request access to the network slice. ### Claim 2 (depends on 1) The method according to claim 1, wherein the back-off condition information comprises: a back-off time parameter indicating that after a back-off period corresponding to the back-off time parameter expires, the UE is allowed to re-request access to the network slice. ### Claim 3 (depends on 2) The method according to claim 2, further comprising: determining, by the network device, the back-off time parameter based on running status information of the network slice. ### Claim 4 (depends on 1) The method according to claim 1, wherein the rejection response message further comprises identification information of a recommended network slice to which the UE may request access while the condition corresponding to the back-off condition information is not met. ### Claim 5 (depends on 1) The method according to claim 1, wherein the rejection response message further comprises an access point name (APN) list indicating one or more APNs to which the UE cannot request access while the condition corresponding to the back-off condition information is not met. ### Claim 6 (depends on 1) The method according to claim 1, wherein the access request comprises identification information of the network slice, wherein the network device is a radio access network (RAN) node, and wherein determining the network slice corresponding to the access request is based on the identification information of the network slice. ### Claim 7 (depends on 6) The method according to claim 6, wherein determining whether to reject the access request is based on congestion status of the network slice. ### Claim 8 (depends on 7) The method according to claim 7, further comprising: receiving, by the RAN node, from a control plane entity supporting the network slice, a congestion level of the network slice or a congestion level of the control plane entity. ### Claim 9 (depends on 8) The method according to claim 8, wherein the congestion level of the network slice or the congestion level of the control plane entity is expressed by a percentage indicating the congestion level of the network slice or the congestion level of the control plane entity, respectively. ### Claim 10 (depends on 1) The method according to claim 1, wherein the network device is a control plane entity (CPE); and wherein determining the network slice corresponding to the access request comprises: determining, by the CPE, based on identification information of the network slice carried in the access request, the network slice corresponding to the access request; or selecting, by the CPE, the network slice corresponding to the access request based on: a service type carried in the access request, subscription data of the UE, capability information of the UE, and/or network policy information. ### Claim 11 A network device, comprising a processor and a non-transitory computer-readable medium having processor-executable instructions stored thereon, wherein the processor-executable instructions, when executed by the processor, facilitate: receiving an access request from a user equipment (UE); determining, based on the access request, a network slice corresponding to the access request; determining whether to reject the access request; and in response to determining to reject the access request, returning a rejection response message to the UE, wherein the rejection response message comprises back-off condition information indicating a condition for the UE to re-request access to the network slice. ### Claim 12 (depends on 11) The network device according to claim 11, wherein the back-off condition information comprises: a back-off time parameter indicating that after a back-off period corresponding to the back-off time parameter expires, the UE is allowed to re-request access to the network slice. ### Claim 13 (depends on 12) The network device according to claim 12, wherein the back-off time parameter is determined by the network device based on running status information of the network slice. ### Claim 14 (depends on 11) The network device according to claim 11, wherein the rejection response message further comprises identification information of a recommended network slice to which the UE may request access while the condition corresponding to the back-off condition information is not met. ### Claim 15 (depends on 11) The network device according to claim 11, wherein the rejection response message further comprises an access point name (APN) list indicating one or more APNs to which the UE cannot request access while the condition corresponding to the back-off condition information is not met. ### Claim 16 (depends on 11) The network device according to claim 11, wherein the network device is a radio access network (RAN) node. ### Claim 17 (depends on 11) The network device according to claim 11, wherein the network device is a control plane entity (CPE). ### Claim 18 A non-transitory computer-readable medium having processor-executable instructions stored thereon, wherein the processor-executable instructions, when executed, facilitate: receiving an access request from a user equipment (UE); determining, based on the access request, a network slice corresponding to the access request; determining whether to reject the access request; and in response to determining to reject the access request, returning a rejection response message to the UE, wherein the rejection response message comprises back-off condition information indicating a condition for the UE to re-request access to the network slice. ### Claim 19 (depends on 18) The non-transitory computer-readable medium according to claim 18, wherein the back-off condition information comprises: a back-off time parameter indicating that after a back-off period corresponding to the back-off time parameter expires, the UE is allowed to re-request access to the network slice.