Multicast Session Advertisement for Inactive UE Reception
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Solution Overview
Problem
User Equipment (UEs) in RRC inactive state face challenges in receiving Multicast/Broadcast Services (MBS) due to the lack of efficient mechanisms for broadcasting advertisements of multicast sessions suitable for inactive reception, leading to restricted data transmission to cells with interested UEs.
Innovation Solution
An apparatus and method that monitor the creation of multicast sessions suitable for inactive reception, requesting RAN nodes within the service area to broadcast advertisements indicating data transmission in a mode suitable for UEs in inactive states, and instructing RAN nodes to periodically broadcast these advertisements in cells where UEs can receive them.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multicast sessions are transmitted in traditional modes, then data transmission to cells with interested UEs is restricted, but UEs in RRC inactive state cannot receive MBS
Solution Approach 1:
The patent introduces a dynamic transmission mode indication mechanism where RAN nodes can switch between different transmission modes (inactive reception mode and connected reception mode) based on real-time UE state and service area conditions. The transmission mode is not fixed but adapts dynamically through network configuration and UE feedback, enabling inactive UEs to receive MBS when appropriate while maintaining traditional restricted transmission when inactive UE reception is not required.
Solution Approach 2:
The patent changes the transmission mode parameter from a fixed state to a configurable state. By introducing transmission mode indications in system information blocks and allowing dynamic reconfiguration of multicast transmission parameters, the system can adjust whether data is transmitted in a mode suitable for inactive UE reception or traditional restricted mode, thereby resolving the contradiction between enabling inactive UE access and maintaining transmission restrictions.
2Loss of information
If RAN nodes broadcast advertisements for multicast sessions, then UEs in inactive state can discover and join sessions, but resource usage increases
Solution Approach 1:
The patent implements partial broadcasting of multicast session advertisements - RAN nodes broadcast transmission mode indications and session information only in service areas where inactive UEs are present or expected. Instead of universal broadcasting across all cells, the system selectively announces multicast sessions in relevant areas, reducing overall resource consumption while ensuring inactive UEs can discover sessions in their current location.
Solution Approach 2:
The system employs feedback mechanisms where UEs indicate their reception capability and interest in multicast sessions. RAN nodes use this feedback information to determine whether to broadcast advertisement messages for specific multicast sessions. This feedback-driven approach ensures advertisements are transmitted only when needed, minimizing unnecessary resource usage while maintaining information availability for interested inactive UEs.
Data Source
AI summary
An apparatus comprises one or more processors and memory storing instructions that, when executed by the one or more processors, cause the apparatus to perform operations. The operations comprise: receiving a request, wherein the request requests the RAN node to broadcast an advertisement of a multicast session, wherein the advertisement indicates that the apparatus transmits data for the multicast session in a transmission mode for inactive reception, and wherein the data transmitted in the transmission mode for inactive reception is suitable to be received by a first terminal in an inactive state; determining the apparatus is configured to transmit the data for the multicast session in the transmission mode for inactive reception; and broadcasting the advertisement in one or more cells associated with the apparatus based on the receiving the request and the determining the apparatus is configured to transmit the data for the multicast session in the transmission mode for inactive reception.