Remote UE P-CSCF Address Acquisition via Relay ProSe
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Solution Overview
Problem
Existing MCPTT systems do not provide a method for remote user equipment to obtain the address information of a Proxy-Call Session Control Function (P-CSCF) in the IMS network, necessary for SIP registration and service access.
Innovation Solution
A wireless communication method where remote user equipment receives and determines a target P-CSCF address from relay user equipment, using proximity service ProSe discovery or connection establishment processes, enabling SIP registration and MCPTT service access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If remote user equipment uses relay user equipment to access IMS network, then remote user equipment can obtain MCPTT service, but remote user equipment cannot obtain P-CSCF address information to complete SIP registration procedure
Solution Approach 1:
The relay user equipment acts as an intermediary to transfer the P-CSCF address information from the network side to the remote user equipment. The relay UE receives the P-CSCF address from the network and forwards it to the remote UE through ProSe discovery or connection establishment procedures, enabling the remote UE to complete SIP registration without directly accessing the IMS network.
2Reliability
If existing IMS registration procedure is used, then network mode of operation is established, but no technology exists for remote user equipment to obtain P-CSCF address
Solution Approach 1:
The relay user equipment performs preliminary action by obtaining the P-CSCF address information from the network before the remote user equipment needs to register. This pre-acquired address information is then made available to the remote UE through ProSe discovery or connection establishment procedures, enabling the remote UE to complete registration without needing direct network access capabilities.
3Ease of operation
If remote user equipment executes SIP registration procedure, then MCPTT service can be obtained, but P-CSCF address information is missing
Solution Approach 1:
The relay user equipment serves as an intermediary that bridges the information gap between the remote user equipment and the IMS network. It obtains the P-CSCF address from the network and transfers it to the remote UE through ProSe discovery or connection establishment procedures, enabling the remote UE to execute SIP registration and acquire MCPTT services despite lacking direct network access.
Data Source
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AI summary
Embodiments of the present invention provide a wireless communication method, remote user equipment, and relay user equipment. The method includes: receiving, by remote user equipment, at least one proxy-call session control function P-CSCF address sent by relay user equipment; and determining, by the remote user equipment, a target P-CSCF address from the at least one P-CSCF address, where the target P-CSCF address is used when the remote user equipment initiates a session registration procedure. The remote user equipment in the embodiments of the present invention can obtain a P-CSCF address in an IMS network by using relay user equipment, so that the remote user equipment can execute a SIP registration procedure according to the obtained P-CSCF address and further obtain an MCPTT service.