Multicast Paging Method for 5G RRC Inactive States
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Solution Overview
Problem
Current 5G/NR multicast and broadcast services face challenges in efficiently paging user equipment in RRC idle or inactive states, leading to unreliable session activation and increased radio resource consumption.
Innovation Solution
A communication method that involves transmitting a paging message with an MBS session identifier to initiate multicast sessions, followed by a second paging message with a user equipment identifier to ensure reliable activation, and setting cause information in RRC messages to differentiate between MBS reception and unicast communication, optimizing resource management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single paging message with MBS session identifier is transmitted to page user equipment in RRC idle or inactive states, then the complexity of paging procedure is reduced, but the reliability of session activation deteriorates because user equipment may miss the paging message
Solution Approach 1:
The paging procedure is segmented into two distinct phases: first, a group paging message containing MBS session identifier is transmitted to page multiple user equipment; second, individual paging messages containing user equipment identifiers are transmitted to specific user equipment that did not respond to the group paging. This segmentation ensures both reduced initial complexity and high reliability through follow-up individual paging.
Solution Approach 2:
The system implements feedback mechanism where the network monitors which user equipment responds to the initial group paging message. Based on this feedback, the network identifies non-responding user equipment and sends targeted individual paging messages only to those specific devices, optimizing resource usage while ensuring reliable activation.
2Reliability
If individual paging messages are sent to all user equipment to ensure reliable activation, then the reliability of paging is improved, but the radio resource consumption increases
Solution Approach 1:
Instead of sending individual paging messages to all user equipment (excessive action), the system sends group paging message to all user equipment first, then sends individual paging messages only to the subset of user equipment that did not respond (partial action). This approach achieves necessary reliability while minimizing radio resource consumption by targeting only non-responding devices.
Solution Approach 2:
The system performs preliminary group paging to all user equipment before sending individual paging messages. This preliminary action allows the network to identify which user equipment needs individual attention, preventing unnecessary transmission of individual paging messages to devices that already responded to the group paging, thus conserving radio resources.
3Loss of information
If cause information for both MBS reception and unicast communication is always set in RRC messages, then the completeness of information is improved, but the overhead of signaling increases
Solution Approach 1:
The cause information field in RRC messages is configured with different values based on the specific scenario: when user equipment transitions to RRC connected state for MBS reception, the cause is set to indicate MBS reception; when transitioning for unicast communication, the cause is set to indicate unicast communication. This local quality approach ensures information completeness for each specific case while minimizing signaling overhead by using appropriate cause values rather than always including all possible information.
Data Source
AI summary
In a first aspect, a communication method is used in a mobile communication system for providing a multicast and broadcast service (MBS), the communication method including transmitting, by a first base station, a paging message to a second base station over an inter-base station interface, the paging message requesting paging of a user equipment having joined a multicast session and including an MBS session identifier for identifying the multicast session.