# US 9,521,570 B2 · Communication control method, user equipment, network server, and system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,521,570 B2 - Document ID: US9521570B2 - Status: Granted - Kind: B2 - Application number: 14/586,166 - Filed: 2014-12-30 - Published: 2015-04-30 - Granted: 2016-12-13 - Earliest claimed: 2013-04-28 - Assignees: Huawei Device Co., Ltd. - Applicants: Huawei Device Co., Ltd. - Inventors: Jian Wang - Web page: https://patentgrep.com/patent/US9521570B2 ## CPC - H04W 24/08: Testing, {supervising or monitoring} using real traffic - H04W 8/005: {Discovery of network devices, e.g. terminals} - H04W 76/00: Connection management - H04W 76/14: Direct-mode setup - H04W 52/242: {taking into account path loss} - H04W 92/18: between terminal devices - 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 control method, including receiving, by a first user equipment, a first message sent by a second user equipment; acquiring receive power of the first message; acquiring power parameter information of the second user equipment; obtaining a path loss value according to the power parameter information of the second user equipment and the receive power of the first message; and determining, according to the path loss value, whether direct communication is allowed between the first user equipment and the second user equipment. The embodiments of the present invention further provide a corresponding user equipment and system. According to the method, user equipment, and system in the embodiments of the present invention, control on direct communication between user equipment can be implemented. ## Claims ### Claim 1 A communication control method comprising: receiving, by a first user equipment, a first message sent by a second user equipment; acquiring a receive power of the first message; acquiring power parameter information of the second user equipment, wherein the power parameter information of the second user equipment is at least one of a transmit power range or a power class of the second user equipment; obtaining a path loss value by performing a calculation according a maximum transmit power value of the second user equipment and the receive power of the first message, wherein the maximum transmit power value is based on the power parameter information; and determining, according to the path loss value, whether direct communication is allowed between the first user equipment and the second user equipment. ### Claim 2 (depends on 1) The method according to claim 1, wherein the first message comprises the power parameter information of the second user equipment, and wherein acquiring the power parameter information of the second user equipment comprises acquiring the power parameter information of the second user equipment included in the first message. ### Claim 3 (depends on 1) The method according to claim 1, wherein acquiring the power parameter information of the second user equipment comprises: receiving a second message comprising the power parameter information of the second user equipment; and acquiring the power parameter information of the second user equipment from the second message. ### Claim 4 (depends on 1) The method according to claim 1, wherein determining, according to the path loss value, whether direct communication is allowed between the first user equipment and the second user equipment comprises: allowing direct communication between the first user equipment and the second user equipment when the path loss value is less than a first threshold; and prohibiting direct communication between the first user equipment and the second user equipment when the path loss value is greater than the first threshold. ### Claim 5 (depends on 1) The method according to claim 1, wherein the power parameter information of the second user equipment further comprises a transmit power value of the second user equipment and wherein obtaining the path loss value according to the power parameter information of the second user equipment and the receive power of the first message comprises performing calculation according to the transmit power value of the second user equipment and the receive power value of the first message to obtain the path loss value. ### Claim 6 (depends on 1) The method according to claim 1, wherein the first threshold is pre-stored in the first user equipment. ### Claim 7 (depends on 1) The method according to claim 1, wherein before determining, according to the path loss value, whether direct communication is allowed between the first user equipment and the second user equipment, the method further comprises receiving a first threshold sent by a network server, and wherein the network server comprises at least one of an evolved NodeB (eNodeB), a base transceiver station (BTS), a serving gateway (SGW), a packet gateway (PGW), a radio network controller (RNC), or a core network element. ### Claim 8 (depends on 1) The method according to claim 1, wherein before determining, according to the path loss value, whether direct communication is allowed between the first user equipment and the second user equipment, the method further comprises receiving a first threshold sent by a third user equipment, and wherein the third user equipment comprises at least one of a cluster head or a Wireless Fidelity (Wi-Fi) hotspot device. ### Claim 9 (depends on 1) The method according to claim 1, wherein the first message comprises a discovery message, a paging message, a paging response message, a service message, and a test message. ### Claim 10 (depends on 1) The method according to claim 1, wherein the power parameter information is indicated by at least one of a time resource, a frequency resource, or a code word resource for transmitting the first message. ### Claim 11 A communication control method, comprising: sending, by a second user equipment, a first message to a first user equipment, wherein the first message comprises power parameter information of the second user equipment, wherein the power parameter information of the second user equipment is at least one of a transmit power range or a power class of the second user equipment, wherein the power parameter information is used to obtain a path loss by performing a calculation according a maximum transmit power value of the second user equipment and the receive power of the first message, wherein the maximum transmit power value is based on the power parameter information, and wherein the power parameter information is used to determine, according to the path loss value, whether direct communication is allowed between the first user equipment and the second user equipment. ### Claim 12 (depends on 11) The method according to claim 11, wherein the first message comprises at least one of a discovery message, a paging message, a paging response message, a service message, or a test message. ### Claim 13 A user equipment, wherein the user equipment performs communication with a second user equipment, the user equipment comprising: a receiver configured to receive a first message sent by the second user equipment; and a processor coupled to the receiver and configured to: acquire a receive power of the first message; acquire power parameter information of the second user equipment, wherein the power parameter information of the second user equipment is at least one of a transmit power range or a power class of the second user equipment; obtain a path loss value by performing a calculation according a maximum transmit power value of the second user equipment and the receive power of the first message, wherein the maximum transmit power value is based on the power parameter information; and determine, according to the path loss value, whether direct communication is allowed between the first user equipment and the second user equipment. ### Claim 14 (depends on 13) The user equipment according to claim 13, wherein the first message comprises the power parameter information of the second user equipment, and wherein the processor is further configured to acquire the power parameter information of the second user equipment included in the first message. ### Claim 15 (depends on 13) The user equipment according to claim 13, wherein the receiver is further configured to receive a second message comprising the power parameter information of the second user equipment, and wherein the processor is further configured to acquire the power parameter information of the second user equipment from the second message. ### Claim 16 (depends on 13) The user equipment according to claim 13, wherein the processor is further configured to: allow direct communication between the user equipment and the second user equipment when the path loss value is less than a first threshold; and prohibit direct communication between the user equipment and the second user equipment when the path loss value is greater than the first threshold. ### Claim 17 (depends on 13) The user equipment according to claim 13, wherein the power parameter information of the second user equipment further comprises a transmit power value of the second user equipment, and wherein the processor is further configured to perform calculation according to the transmit power value of the second user equipment and the receive power value of the first message to obtain the path loss value. ### Claim 18 (depends on 13) The user equipment according to claim 13, wherein the power parameter information is indicated by a time resource, a frequency resource, and a code word resource for transmitting the first message.