LTM Cell Switch Retransmission Using Configured and Dynamic Grants
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Solution Overview
Problem
The reliability of first uplink data and RRC reconfiguration completion signaling transmission during LTM cell switch can lead to failure and service interruption delays in existing protocols.
Innovation Solution
A retransmission method is implemented for LTM random access-less cell switch completion information using a scheduling method, involving configured grant and dynamic grant, with a retransmission timer and hybrid automatic repeat request to enhance transmission reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If configured grant is used for transmitting LTM cell switch completion information, then transmission speed is improved, but transmission reliability deteriorates
Solution Approach 1:
The patent implements dynamic switching between configured grant and dynamic grant transmission modes based on whether acknowledgment is received. The system transitions from a static configured grant approach to a dynamic hybrid approach that adapts transmission method based on transmission success, thereby resolving the contradiction between speed and reliability.
Solution Approach 2:
The patent changes the transmission parameter (grant type) from fixed configured grant to variable hybrid grant based on acknowledgment status. When acknowledgment is received, configured grant is used for high speed; when not received, dynamic grant is used for high reliability, thus resolving the speed-reliability contradiction through parameter adaptation.
2Device complexity
If simple transmission protocol is used, then device complexity is reduced, but transmission reliability deteriorates
Solution Approach 1:
The patent segments the transmission process into two distinct phases: initial transmission using simple configured grant protocol, and retransmission using dynamic grant protocol when needed. This segmentation allows the system to maintain low complexity for normal operation while providing high reliability through conditional retransmission.
Solution Approach 2:
The patent performs preliminary transmission using the simple configured grant protocol before attempting retransmission. This preliminary action allows the system to benefit from low complexity in the common case while preparing a more complex retransmission mechanism as a fallback for reliability when the simple protocol fails.
3Reliability
If retransmission mechanism is added, then transmission reliability is improved, but device complexity increases
Solution Approach 1:
The patent implements a feedback mechanism where the system monitors whether acknowledgment is received for transmitted cell switch completion information. This feedback drives the retransmission decision, adding reliability through conditional retransmission while keeping complexity manageable by only activating the complex dynamic grant mechanism when feedback indicates failure.
Solution Approach 2:
The patent adds dynamic retransmission capability that activates only when needed based on acknowledgment status. The system remains simple in the normal case (no retransmission needed) and becomes more complex only when retransmission is required, thus improving reliability while minimizing the impact on overall device complexity.
4Loss of time
If LTM random access-less cell switch is used, then service interruption delay is reduced, but transmission reliability deteriorates
Solution Approach 1:
The patent implements dynamic transmission mode selection within the LTM random access-less cell switch framework. The system uses configured grant for fast transmission to minimize service interruption delay, and switches to dynamic grant with retransmission when reliability is compromised, thus resolving the contradiction between speed and reliability in the cell switch context.
Data Source
AI summary
The present application retransmits the LTM random access-less cell switch completion information based on a scheduling method, and provides an information retransmission mechanism applicable to the LTM cell switch process, which can improve the transmission reliability of the LTM random access-less cell switch completion information, thereby reducing LTM cell switch failures and/or reduce service interruption delays.