CN-122001436-A - Call establishment method and network side equipment

Abstract

The application discloses a call establishment method and network side equipment, which belong to the technical field of communication, wherein the call establishment method comprises the steps that a first network element requests a first transmission address to an AGW deployed on a satellite under the condition that a first condition is confirmed to be met, wherein the first network element provides service for a first UE, the first network element sends the first transmission address to a second network element, the first condition comprises at least one of the following steps that the first UE and the second UE can carry out UE-SAT-UE communication, the first UE carries out SDP negotiation of early session or early media, an AGW deployed on the satellite can carry out network element communication with an IMS user plane deployed on the ground, the first UE is not in roaming, the satellite accessed by the first UE is a satellite in a regeneration mode, and a satellite identifier of the second UE is received, wherein the first UE is a calling party UE, and the second UE is a called party UE.

Inventors

• JIN HUI
• XIE ZHENHUA
• ZHANG DI

Assignees

• 维沃移动通信有限公司

Dates

Publication Date

20260508

Application Date

20241106

Claims (20)

1. 1. A method for call establishment, comprising: under the condition that the first condition is met, a first network element requests a first transmission address from an Access Gateway (AGW) deployed in a satellite, wherein the first network element provides service for first User Equipment (UE); the first network element sends the first transmission address to a second network element; The first condition includes at least one of: the first UE and the second UE can perform user equipment-satellite-User Equipment (UE) -SAT-UE communication; The first UE performs session description protocol SDP negotiation of early session or early media; The AGW deployed on the satellite can communicate with the IMS user plane network element deployed on the ground; the first UE is not roaming; the satellite accessed by the first UE is a satellite in a regeneration mode; receiving a satellite identification of a second UE; the first UE is a calling party UE, and the second UE is a called party UE.
2. 2. The method of claim 1, wherein requesting the first transport address from the AGW deployed at the satellite comprises at least one of: Requesting a transport address corresponding to early media or a transport address corresponding to the early session from an AGW deployed at a satellite; Requesting a transmission address corresponding to a core network side from an AGW deployed in a satellite; and requesting the AGW deployed in the satellite for a transmission address corresponding to the second termination point.
3. 3. The method according to claim 1 or 2, characterized in that the method further comprises: the first network element performing a first operation if it is determined that the first condition is met, the first operation comprising sending a 183 message to the first UE, the 183 message containing an SDP offer for early session or early media; wherein the first operation does not include at least one of: requesting a transmission address corresponding to an IMS access network side from an AGW deployed in a satellite; and requesting the AGW deployed in the satellite for a transmission address corresponding to the first termination point.
4. 4. A method according to any one of claims 1 to 3, further comprising: the first network element receives a request message sent by a first UE, wherein the request message comprises an SDP proposal of an early session or early media; The first network element performs a second operation if it is determined that the second condition is satisfied, the second operation including at least one of: Deleting the SDP offer of the early session or early media in the request message; the SDP offer for the early session or early media is saved.
5. 5. The method of claim 4, wherein the second condition comprises at least one of: the first UE accesses a network through a satellite; the first UE performs SDP negotiation of early session or early media; the AGW deployed on the satellite can communicate with the IMS user plane network element deployed on the ground; the first UE is not roaming; the satellite accessed by the first UE is a satellite in the regeneration mode.
6. 6. The method according to claim 4 or 5, wherein the first network element sending the first transport address to a second network element comprises: the first network element modifies a second transport address in the stored SDP offer of early session or early media to the first transport address; And sending the modified SDP proposal of the early session or the early media to the second network element.
7. 7. The method according to any of claims 1 to 6, wherein the first network element sending the first transport address to a second network element comprises: The first network element sends a temporary acknowledgement response, PRACK, to the second network element, the PRACK comprising an SDP answer of an early session or early media, the SDP answer of the early session or early media comprising the first transport address.
8. 8. The method according to any of the claims 1 to 7, characterized in that the first network element is a proxy call session control function P-CSCF.
9. 9. A method for call establishment, comprising: the second network element sends a third transmission address under the condition that the third condition is met, wherein the second network element provides service for the second UE; Wherein the third condition includes at least one of: The first UE and the second UE can perform UE-SAT-UE communication; the first UE performs SDP negotiation of early session or early media; the AGW deployed on the satellite can communicate with the IMS user plane network element deployed on the ground; the first UE is not roaming; the satellite accessed by the first UE is a satellite in a regeneration mode; receiving at least one of a satellite identification of a first UE and a satellite identification of a second UE; the first UE is a calling party UE, and the second UE is a called party UE.
10. 10. The method of claim 9, wherein the transmitting the third transport address comprises: Transmitting the third transport address to a third network element, the third transport address being received from the first network element, or And sending the third transport address to the first network element, wherein the third transport address is received from the third network element.
11. 11. The method of claim 10, wherein the step of determining the position of the first electrode is performed, The sending the third transport address to the third network element comprises sending a normal SDP offer to the third network element, the normal SDP offer comprising the third transport address.
12. 12. The method of claim 11, wherein the method further comprises: and receiving an SDP response of the early session or the early media sent by the first network element, wherein the SDP response of the early session or the early media comprises the third transmission address.
13. 13. The method of claim 10, wherein the sending the third transport address to the first network element comprises: and sending an SDP response of the early session or the early media to the first network element, wherein the SDP response of the early session or the early media comprises the third transmission address.
14. 14. The method according to claim 9 or 12, wherein said sending the third transport address to the first network element comprises: And sending a 200 OK message for PRACK to the first network element, wherein the 200 OK message for PRACK comprises the third transmission address.
15. 15. A method according to any of claims 9 to 14, wherein the second network element is an application server AS.
16. 16. A device for call establishment, applied to a first network element, comprising: The communication module is used for requesting a first transmission address to an AGW deployed on a satellite under the condition that a first condition is met, wherein the first network element provides service for a first UE, the first transmission address is sent to a second network element, the first condition comprises at least one of the following steps that the first UE and the second UE can conduct UE-SAT-UE communication, the first UE conducts SDP negotiation of early session or early media, the AGW deployed on the satellite can communicate with an IMS user plane network element deployed on the ground, the first UE is not in roaming, the satellite accessed by the first UE is in a satellite in a regeneration mode, and satellite identification of the second UE is received, wherein the first UE is a calling party UE, and the second UE is a called party UE.
17. 17. The apparatus of claim 16, wherein the communication module is configured to at least one of: Requesting a transport address corresponding to early media or a transport address corresponding to the early session from an AGW deployed at a satellite; Requesting a transmission address corresponding to a core network side from an AGW deployed in a satellite; and requesting the AGW deployed in the satellite for a transmission address corresponding to the second termination point.
18. 18. The apparatus of claim 16 or 17, wherein the communication module is further configured to: in the event that the first condition is determined to be met, performing a first operation comprising sending a 183 message to the first UE, the 183 message containing an SDP offer for an early session or early media; wherein the first operation does not include at least one of: requesting a transmission address corresponding to an IMS access network side from an AGW deployed in a satellite; and requesting the AGW deployed in the satellite for a transmission address corresponding to the first termination point.
19. 19. The apparatus of any one of claims 16 to 18, wherein the communication module is further configured to: Receiving a request message sent by a first UE, wherein the request message comprises an SDP proposal of an early session or early media; In the event that it is determined that the second condition is satisfied, performing a second operation comprising at least one of: Deleting the SDP offer of the early session or early media in the request message; the SDP offer for the early session or early media is saved.
20. 20. The apparatus of claim 19, wherein the second condition comprises at least one of: the first UE accesses a network through a satellite; the first UE performs SDP negotiation of early session or early media; the AGW deployed on the satellite can communicate with the IMS user plane network element deployed on the ground; the first UE is not roaming; the satellite accessed by the first UE is a satellite in the regeneration mode.

Description

Call establishment method and network side equipment Technical Field The application belongs to the technical field of communication, and particularly relates to a call establishment method and network side equipment. Background User equipment-satellite-user equipment (UE-satellite-UE) communications may also be referred to as UE-SAT-UE communications, meaning that 2 UEs all communicating via a satellite access network may communicate directly via a satellite without going through network elements deployed on the ground. 2 UEs may communicate via one satellite, or via 2 satellites with connectivity. In UE-SAT-UE communication, the network side may need to use some transmission addresses, for example, the transmission addresses used for playing early media (EARLY MEDIA), however, at present, the network side cannot determine under what conditions the transmission addresses can be requested or sent, which is easy to cause communication problems due to unreasonable request timing or sending timing of the transmission addresses. Disclosure of Invention The embodiment of the application provides a call establishment method and network side equipment, which can solve the problem that a network side can not determine what conditions can be met to request or send a transmission address in UE-SAT-UE communication. In a first aspect, a call establishment method is provided, wherein a first network element requests a first transmission address to an AGW deployed on a satellite under the condition that a first condition is met, the first network element provides service for a first UE, the first network element sends the first transmission address to a second network element, the first condition comprises at least one of enabling the first UE to communicate with the second UE by UE-SAT-UE, enabling the first UE to conduct SDP negotiation of early session or early media, enabling an AGW deployed on the satellite to communicate with an IMS user plane network element deployed on the ground, enabling the first UE not to roam, enabling the satellite accessed by the first UE to be in a regeneration mode, receiving satellite identification of the second UE, wherein the first UE is a calling party UE, and the second UE is a called party UE. In a second aspect, a call establishment method is provided, wherein a second network element sends a third transmission address under the condition that a third condition is met, the second network element provides service for a second UE, the third condition comprises at least one of enabling a first UE to communicate with the second UE by UE-SAT-UE, enabling the first UE to conduct SDP negotiation of early session or early media, enabling AGW deployed on a satellite to communicate with an IMS user plane network element deployed on the ground, enabling the first UE not to roam, enabling the satellite accessed by the first UE to be in a satellite in a regeneration mode, receiving at least one of satellite identification of the first UE and satellite identification of the second UE, enabling the first UE to be a calling party UE, and enabling the second UE to be a called party UE. In a third aspect, a device for establishing a call is provided, and the device is applied to a first network element, and comprises a communication module, wherein the communication module is used for requesting a first transmission address from an AGW deployed on a satellite under the condition that a first condition is met, the first network element provides service for a first UE, the first transmission address is sent to a second network element, the first condition comprises at least one of the following steps that the first UE and the second UE can conduct UE-SAT-UE communication, the first UE conducts SDP negotiation of early session or early media, the AGW deployed on the satellite can communicate with an IMS user plane network element deployed on the ground, the first UE is not in roaming, the satellite accessed by the first UE is in a regeneration mode, the satellite identifier of the second UE is received, and the first UE is a calling party UE, and the second UE is a called party UE. The fourth aspect provides a call establishment device, which is applied to a second network element and comprises a communication module, wherein the communication module is used for sending a third transmission address under the condition that a third condition is met, the second network element provides service for a second UE, the third condition comprises at least one of the following steps that the first UE and the second UE can conduct UE-SAT-UE communication, the first UE conducts SDP negotiation of early session or early media, AGW deployed on a satellite can communicate with IMS user plane network elements deployed on the ground, the first UE is not in roaming, a satellite accessed by the first UE is a satellite in a regeneration mode, at least one of a satellite identifier of the first UE and a satellite identi