RRC State Management for Multicast Uplink Reliability
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Solution Overview
Problem
In wireless communication systems, particularly in 5G architecture, there is a challenge in supporting uplink transmissions for User Equipment (UE) in RRC Connected and RRC Inactive states, especially when conflicts arise between unicast and multicast/groupcast configuration parameters, affecting PTM transmission performance.
Innovation Solution
A method and device for uplink transmissions that involve maintaining a timer to notify the base station of the UE's state preference, determining resource allocation for multicast and unicast signals, and managing RRC states to ensure optimal performance by avoiding unnecessary state switches, allowing for simultaneous unicast and multicast/groupcast data reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the terminal switches to RRC Inactive state to save energy, then energy consumption is reduced, but the ability to receive PTM data and send HARQ feedback is lost
Solution Approach 1:
The terminal dynamically adjusts its RRC state based on whether PTM data is being received. When PTM data reception is active, the terminal maintains RRC Connected state to ensure full functionality. When PTM data reception is inactive, the terminal can transition to RRC Inactive state to save energy. This dynamic state adjustment resolves the contradiction between energy saving and maintaining PTM transmission capability.
2Reliability
If the terminal maintains RRC Connected state to support PTM transmission, then PTM transmission performance is improved, but energy consumption increases
Solution Approach 1:
The terminal periodically evaluates whether PTM data is being received and adjusts its RRC state accordingly. Instead of maintaining RRC Connected state continuously, the terminal transitions between RRC Connected and RRC Inactive states based on periodic assessment of PTM data reception needs. This periodic state adjustment reduces energy consumption while ensuring PTM transmission capability is maintained when needed.
3Adaptability or versatility
If unicast and multicast configuration parameters are simultaneously supported, then communication flexibility is improved, but parameter conflict and system complexity increase
Solution Approach 1:
The patent introduces a priority mechanism as an intermediary to resolve conflicts between unicast and multicast configuration parameters. When parameter conflicts occur, the system determines which parameter set (unicast or multicast) has higher priority and applies that configuration, rather than attempting to simultaneously maintain both conflicting configurations. This intermediary priority mechanism simplifies parameter management while preserving communication flexibility.
Data Source
AI summary
Discloses present a method and a device in a node for wireless communications. A node maintains a first timer; and as a response to any condition in a first condition set being satisfied, transmits a first message; a condition in the first condition set is that the first timer is expired; the first message is used for indicating at least one non-unicast identifier; the node is in a first RRC state when transmitting the first message. The present application proposes the conditions of triggering a first message in multicast groupcast cases as well as corresponding transmission method and device, making it possible to transmit the current state of the node to the network side to ensure that when using a HARQ for multicast groupcast services, the terminal is able to enter into or stay in the RRC connected state, thus enhancing the transmission reliability and optimizing the system performance.