ProSe information transmission method, terminal, and communications device

A proximity service (ProSe) information transmission method implemented by a second ProSe entity, the method comprising:

• receiving from a first ProSe entity a second message comprising a ProSe application identity (APP ID), wherein the first ProSe entity is in a home public land mobile network (HPLMN) of a first terminal, and wherein the second ProSe entity is in a visited public land mobile network (VPLMN) of the first terminal;
• allocating a corresponding codeword or a mask to the ProSe APP ID, wherein the codeword or the mask comprises a first public land mobile network identity (PLMN ID) of the VPLMN;
• sending to the first ProSe entity a third message comprising a first identity, wherein the first identity is the codeword or the mask;
• receiving, from a second terminal after the second terminal acquires a second identity generated by the first ProSe entity according to the first identity, a fifth message comprising the second identity, wherein the second identity comprises the first identity and a second PLMN ID of the HPLMN;
• sending to the first ProSe entity and according to the second PLMN ID, a seventh message comprising the second identity;
• receiving, from the first ProSe entity after the first ProSe entity determines the ProSe APP ID according to the second identity, an eighth message comprising the ProSe APP ID;
• and
• sending to the second terminal a sixth message comprising the ProSe APP ID.

A first proximity service (ProSe) entity comprising:

• a processor;
• a receiver coupled to the processor and configured to receive from a first terminal a first message comprising a ProSe application identity (APP ID), wherein the first ProSe entity is in a home public land mobile network (HPLMN) of the first terminal;
• and
• a transmitter coupled to the processor and configured to transmit to a second ProSe entity a second message comprising the ProSe APP ID, wherein the second ProSe entity is in a visited public land mobile network (VPLMN) of the first terminal,
• wherein the receiver is further configured to receive from the second ProSe entity a third message comprising a first identity, wherein the first identity is a codeword or a mask allocated to the ProSe APP ID by the second ProSe entity, and wherein the first identity comprises a first public land mobile network identity (PLMN ID) of the VPLMN,
• wherein the processor is configured to generate, according to the first identity, a second identity comprising the first identity and a second PLMN ID of the HPLMN of the first terminal,
• wherein the transmitter is further configured to transmit to the first terminal a fourth message comprising the second identity, and
• wherein the processor is further configured to:
• acquire, before the generating the second identity, first indication information indicating whether the first terminal is in a roaming state;
• and
• determine, according to second indication information and when the first indication information indicates that the first terminal is in the roaming state, that the first terminal supports broadcasting of the second identity, wherein the second indication information indicates whether the first terminal can support broadcasting of the second identity.