5G NR Multicast Paging for Selective RRC State Transitions
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Solution Overview
Problem
Current 3GPP technical specifications limit multicast reception in 5G NR systems to the RRC connected state, leading to increased network load and power consumption when transitioning UEs from the RRC inactive state for multicast sessions.
Innovation Solution
Introduce new information elements in paging messages to selectively transition UEs from the RRC inactive state to the RRC connected state based on session information and identification information, allowing UEs to maintain the inactive state for multicast reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UEs in RRC inactive state transition to RRC connected state for multicast reception, then multicast service can be provided, but network load and power consumption increase
Solution Approach 1:
The patent segments the UE population into different groups based on their RRC state and multicast reception requirements. UEs in RRC inactive state are identified and handled separately from UEs in RRC connected state, allowing selective transition only for those UEs that cannot receive multicast in inactive state. This segmentation reduces unnecessary state transitions and optimizes network resource usage.
Solution Approach 2:
The patent changes the parameter of RRC state management by introducing new information elements in paging messages that indicate whether multicast reception is supported in RRC inactive state. This parameter change enables the network to dynamically control UE state transitions based on multicast session characteristics, reducing unnecessary transitions from inactive to connected state.
2Reliability
If all UEs transition to RRC connected state upon receiving paging message, then multicast session can be started, but network congestion increases
Solution Approach 1:
The patent applies partial action by having only a subset of UEs (those in RRC connected state or those unable to receive multicast in inactive state) transition to connected state for multicast reception. UEs already in connected state or capable of receiving multicast in inactive state remain in their current state, avoiding excessive transitions and reducing network congestion while still ensuring multicast session delivery.
Solution Approach 2:
The patent enables UEs in RRC inactive state to self-determine whether they need to transition to connected state by providing them with information elements in paging messages that indicate multicast reception capabilities. UEs can autonomously make state transition decisions based on their capabilities and the network's indications, reducing unnecessary signaling and improving network efficiency.
3Use of energy by stationary object
If UEs maintain RRC inactive state for multicast reception, then power consumption is reduced, but service reliability may be compromised
Solution Approach 1:
The patent changes the parameter of multicast reception capability by introducing information elements that indicate whether multicast can be received in RRC inactive state. This parameter change allows the network to selectively enable inactive state reception for compatible UEs and sessions, maintaining power efficiency while ensuring reliability for UEs that require connected state reception.
Solution Approach 2:
The patent segments multicast sessions based on their reception requirements, identifying which sessions can be delivered to UEs in RRC inactive state and which require UEs to be in RRC connected state. This segmentation allows the system to optimize power consumption for sessions that support inactive state reception while maintaining reliability for sessions that require connected state.
Data Source
AI summary
A communication method includes: receiving, by a user equipment in a radio resource control (RRC) inactive state that has joined a multicast session, a paging message from a network node, the paging message notifying the user equipment of a start of the multicast session; and determining, by the user equipment, whether to transition from the RRC inactive state to an RRC connected state in response to receiving the paging message. The paging message includes session information about the multicast session and identification information associated with the session information for specifying one or more user equipments to be caused to transition to the RRC connected state among a plurality of user equipments that have joined the multicast session. The determining includes determining whether to transition to the RRC connected state based on the session information and the identification information.