MBS PDU Session Interface for AP-Modem Coordination
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Solution Overview
Problem
Existing wireless communication systems lack effective methods for managing protocol data unit (PDU) sessions to support multicast and broadcast services (MBS), particularly in managing MBS PDU sessions and coordinating with network entities.
Innovation Solution
A user equipment (UE) employs application processor (AP) and modem communication using AT commands, such as +CMSCONT, +CMSRDP, +CGCMOD, and +CGACT, to manage and establish MBS PDU sessions, coordinating with network entities to support MBS operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional PDU session management techniques are used, then existing wireless communication systems can maintain basic connectivity, but they cannot effectively support multicast and broadcast service (MBS) operations
Solution Approach 1:
The patent segments PDU session management into distinct types (first type for unicast, second type for multicast/broadcast) with separate identification mechanisms. The network entity and UE independently determine session types using specific indicators, allowing MBS support without complicating existing unicast session management procedures.
Solution Approach 2:
The patent creates a universal PDU session management framework that handles both traditional unicast and new multicast/broadcast services through a common interface. The same PDU session establishment and modification procedures are used for both service types, with type identification adding minimal overhead while enabling multi-functionality.
2Reliability
If new MBS-specific PDU session management procedures are implemented, then MBS service support is enabled, but the complexity of session management increases
Solution Approach 1:
The patent introduces type indication indicators as intermediary elements that mediate between the PDU session management procedures and the underlying service type. These indicators act as simple flags or parameters that guide the management behavior without requiring complex decision logic, thus improving reliability while minimizing added complexity.
Solution Approach 2:
The patent modifies existing PDU session management parameters by adding type indication fields to session establishment and modification messages. This parameter-based approach allows the same procedural framework to handle different service types reliably, avoiding the need for entirely new complex procedures while maintaining MBS support integrity.
3Reliability
If independent MBS PDU session management is implemented, then MBS service reliability is improved, but the coordination overhead between network entities increases
Solution Approach 1:
The patent performs preliminary determination of PDU session types during the initial session establishment phase. Network entities pre-configure session type indicators and store them for later reference, eliminating the need for repeated determination and coordination during MBS operations. This preliminary action reduces real-time coordination overhead while maintaining reliable session management.
Data Source
AI summary
This disclosure provides systems, methods, and apparatus, including computer programs encoded on computer-readable media, for an application processor (AP) 160 of a user equipment (EU) 150 to communicate with a modem 170 of the UE 150 to set, define and request status of a multicast and broadcast service (MBS) supported by an MBS protocol data unit (PDU) session. For example, the AP 160 can communicate with the modem 170 using one or more attention (AT) commands, such as an MBS session context (+CMSCONT) command 109 or an MBS session read dynamic parameters (+CMSRDP) command 124. The AP 160 can communicate with the modem 170 to modify an existing PDU session to support the MBS, or to establish a new PDU session for the MBS. An MBS PDU session that is requested by the UE 150 can be modified, accepted, or rejected by a network 180.