Wireless communication method and communication device

1. A wireless communication method, comprising:

receiving, by a network device, a data packet which is transmitted from a first terminal device through a control plane or a user plane within a 3rd Generation Partnership Project (3GPP) network; and

sending, by the network device, the data packet to a second terminal device through the control plane or the user plane within the 3GPP network,

wherein there is a first session connection between the first terminal device and the second terminal device, and the first session connection is used for the first terminal device to communicate with the second terminal device, wherein the data packet is sent to the network device through the user plane via the first session connection, and

wherein sending, by the network device, the data packet to the second terminal device through the control plane or the user plane within the 3GPP network comprises:

sending, by the network device, the data packet to the second terminal device through the user plane within the 3GPP network by using the first session connection.

2. The method according to claim 1 , wherein a User Plane Function (UPF) of the first terminal device and the UPF of the second terminal device are a same first UPF, and the network device is the first UPF, and

wherein the data packet received by the network device carries first address information of a connection between the first terminal device and the first UPF in the first session connection, and

wherein sending, by the network device, the data packet to the second terminal device through the user plane within the 3GPP network by using the first session connection comprises:

determining, by the network device, second address information based on the first address information, wherein the second address information is address information of a connection between the second terminal device and the first UPF in the first session connection; and

encapsulating the second address information in the data packet and sending the data packet to the second terminal device by the network device.

3. The method according to claim 1 , wherein the UPF of the first terminal device is a second UPF, the UPF of the second terminal device is a third UPF other than the second UPF, and the network device is the second UPF, and the data packet received by the network device carries third address information of a connection between the first terminal device and the second UPF in the first session connection, and

wherein sending, by the network device, the data packet to the second terminal device through the user plane in the 3GPP network by using the first session connection comprises:

determining, by the network device, fourth address information based on the third address information, wherein the fourth address information is address information of a connection between the second UPF and the third UPF in the first session connection; and

encapsulating the fourth address information in the data packet and sending the data packet to the second terminal device through the third UPF by the network device.

4. The method according to claim 1 , wherein the UPF of the first terminal device is a second UPF, the UPF of the second terminal device is a third UPF other than the second UPF, and the network device is the third UPF, and the data packet received by the network device carries fourth address information of a connection between the second UPF and the third UPF in the first session connection, and

wherein sending, by the network device, the data packet to the second terminal device through the user plane in the 3GPP network by using the first session connection comprises:

determining, by the network device, fifth address information based on the fourth address information, wherein the fifth address information is address information of a connection between the third UPF and the second terminal device in the first session connection; and

encapsulating the fifth address information in the data packet and sending the data packet to the second terminal device by the network device.

5. The method according to claim 1 , wherein the network device is a core network entity, the data packet carries at least one piece of information of: an identity of the first session connection, address information of the first session connection, identification information of the first terminal device and identification information of the second terminal device, and the data packet is sent to the network device through the control plane, and

wherein sending, by the network device, the data packet to the second terminal device through the control plane or the user plane in the 3GPP network comprises:

determining a next hop node of the data packet by the network device based on the at least one piece of information; and

sending, by the network device, the data packet to the next hop node through the control plane, so that the data packet is sent to the second terminal device by the next hop node.

6. A network device, comprising:

a processor, a memory, a transceiver, and instructions stored in the memory that, when executed by the processor, cause the transceiver to:

receive a data packet which is transmitted from a first terminal device through a control plane or a user plane within a 3rd Generation Partnership Project (3GPP) network; and

send the data packet to a second terminal device through the control plane or the user plane within the 3GPP network,

wherein there are a second session connection between the first terminal device and a UPF of the first terminal device, and a third session connection between the second terminal device and the UPF of the second terminal device, the UPF of the first terminal device and the UPF of the second terminal device are a same fourth UPF, and the network device is the fourth UPF, the data packet carries address information of the third session connection and/or identification information of the second terminal device, and

the transceiver is further configured to send the data packet to the second terminal device through the user plane based on the address information of the third session connection and/or the identification information of the second terminal device.

7. The network device according to claim 6 , wherein the processor is configured to:

determine the address information of the third session connection based on the identification information of the second terminal device; and

encapsulate the address information of the third session connection in the data packet and.

8. The network device according to claim 7 , wherein there are a second session connection between the first terminal device and a UPF of the first terminal device, and a third session connection between the second terminal device and the UPF of the second terminal device, the UPF of the first terminal device is a fifth UPF, the UPF of the second terminal device is a sixth UPF other than the fifth UPF, and the network device is the fifth UPF, the data packet carries address information of the third session connection and/or identification information of the second terminal device,

wherein the processor is further configured to:

determine the sixth UPF by the network device based on the address information of the third session connection and/or the identification information of the second terminal device; and

wherein the transceiver is further configured to:

send the data packet to the second terminal device through the sixth UPF.

9. A terminal device which is a first terminal device, the terminal device comprising a processor, a memory, a transceiver and instructions stored in the memory that, when executed by the processor, cause the transceiver to:

send a data packet to a second terminal device, the data packet comprising address information of a session connection between the second terminal device and a User Plane Function (UPF) or address information of a session connection between the first terminal device and the UPF, wherein the session connection between the first terminal device and the UPF is dedicated to the first terminal device for communication with the second terminal device within a 3rd Generation Partnership Project (3GPP) network, and the address information of the session connection between the second terminal device and the UPF is used for the second terminal device for communication with other terminal devices within the 3GPP network,

wherein the transceiver is further configured to:

receive the address information of the session connection between the second terminal device and the UPF or the address information of the session connection between the first terminal device and the UPF sent by a network device.

10. The terminal device according to claim 9 , wherein the address information of the session connection between the second terminal device and the UPF is carried in broadcast information or dedicated signaling.