Prose information transmission method, terminal, and communications device

A proximity service (ProSe) information transmission method, comprising:

• acquiring, by a monitoring terminal at a 3GPP network layer in a home public land mobile network (HPLMN), a code word broadcast by a first terminal, wherein the code word is allocated to the first terminal by a first ProSe entity, and the first ProSe entity is a ProSe entity in the HPLMN;
• sending, by the monitoring terminal at the 3GPP network layer in the HPLMN, a first message to a receiving ProSe entity when the code word matches a prestored code word, wherein the first message carries the code word and a first application identity, the first application identity is an application identity of a first application, and the receiving ProSe entity is a ProSe entity in an HPLMN of the monitoring terminal;
• receiving, by the monitoring terminal at the 3GPP network layer in the HPLMN, a second message sent by the receiving ProSe entity, wherein the second message carries a application user identity, the v identity is an application user identity that is allocated to a first application user by a first application server, the first application user is a user of the first application of the first terminal, and the first application server is an application server of the first application;
• and
• discovering, by the monitoring terminal at the 3GPP network layer in the HPLMN, the first application user according to the application user identity,
• wherein the second message further carries the first application identity, and the first application identity is configured to indicate the first application corresponding to the application user identity.

A monitoring terminal, comprising:

• an processor, a transmitter, a receiver, and a discovery unit;
• wherein
• the processor is configured to acquire a code word broadcast by a first terminal at a 3GPP network layer in a home public land mobile network (HPLMN), wherein the code word is allocated to the first terminal by a first proximity service (ProSe) entity, and the first ProSe entity is a ProSe entity in the HPLMN;
• the transmitter is configured to send a first message to a receiving ProSe entity at the 3GPP network layer in the HPLMN when the code word matches a prestored code word, wherein the first message carries the code word and a first application identity, the first application identity is an application identity of a first application, and the receiving ProSe entity is a ProSe entity in an HPLMN of the monitoring terminal;
• the receiver is configured to receive a second message sent by the receiving ProSe entity at the 3GPP network layer in the HPLMN, wherein the second message carries a application user identity, the application user identity is an application user identity that is allocated to a first application user by a first application server, the first application user is a user of the first application of the first terminal, and the first application server is an application server of the first application;
• and
• the discovery unit is configured to discover the first application user according to the application user identity at the 3GPP network layer in the HPLMN,
• wherein the transmitter is further configured to:
• when the code word matches the prestored code word, and before the processor acquires the code word broadcast by the first terminal, send a third message to the receiving ProSe entity, wherein the third message carries first information, a fourth identity, and the first application identity, wherein the first information comprises a third identity or a sixth identity, the third identity is a temporary terminal identity that is allocated to the monitoring terminal by the receiving ProSe entity, the sixth identity is a terminal identity of the monitoring terminal, the fourth identity is an application user identity that is allocated to a second application user by the first application server, and the second application user is a user of the first application of the monitoring terminal;
• and
• wherein the receiver is further configured to receive a fourth message sent by the receiving ProSe entity, wherein the fourth message carries the code word.