MAC-CE Retransmission Logic Balancing Reliability and Latency
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Solution Overview
Problem
Existing wireless communication systems, particularly in 5G NR, face challenges in efficiently managing medium access control-control element (MAC-CE) communication, leading to inefficiencies in data transmission and reception due to high latency and varying reliability requirements of different services.
Innovation Solution
Implementing a method where a transmitter or receiver determines whether to retransmit or transmit a new MAC-CE based on the presence of data in the shared channel, using HARQ signaling to optimize MAC-CE communication by combining or updating MAC-CE transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If MAC-CE is always retransmitted when HARQ signaling indicates decoding failure, then reliability of control command delivery is improved, but latency increases and spectral efficiency deteriorates
Solution Approach 1:
The patent changes the parameter of retransmission behavior based on the type of MAC-CE. For activation MAC-CEs, retransmission is performed to ensure reliability. For deactivation MAC-CEs, retransmission is avoided to reduce latency. This parameter-based differentiation resolves the contradiction by adapting the retransmission strategy to the specific requirements of each MAC-CE type.
Solution Approach 2:
The patent introduces dynamic decision-making in the retransmission process. The transmitter determines whether to retransmit based on the MAC-CE type and HARQ signaling, creating a flexible and adaptive system. This dynamic approach allows the system to optimize between reliability and latency in real-time based on the specific communication context.
2Reliability
If MAC-CE retransmission is performed for all packets, then control command reliability is improved, but spectral efficiency deteriorates due to redundant transmissions
Solution Approach 1:
The patent changes the retransmission parameter based on MAC-CE type. Activation MAC-CEs trigger retransmission to ensure reliability, while deactivation MAC-CEs do not trigger retransmission to improve spectral efficiency. This selective approach optimizes the balance between reliability and spectral efficiency by applying different strategies to different control command types.
Solution Approach 2:
The patent extracts the retransmission function from the universal MAC-CE handling process and applies it selectively only to activation MAC-CEs. This extraction eliminates unnecessary retransmissions for deactivation MAC-CEs, thereby improving spectral efficiency while maintaining reliability where it is most critical.
3Productivity
If new MAC-CE is transmitted instead of retransmitting original MAC-CE after decoding failure, then spectral efficiency is improved, but reliability of critical control commands deteriorates
Solution Approach 1:
The patent changes the transmission strategy parameter based on MAC-CE type. For activation MAC-CEs, the system performs retransmission to ensure reliability. For deactivation MAC-CEs, the system transmits new MAC-CEs to improve spectral efficiency. This parameter-based differentiation resolves the contradiction by matching the transmission strategy to the criticality of each control command type.
Data Source
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Figure 3A~3B
AI summary
Some aspects provide an apparatus for wireless communication, in accordance with some aspects of the present disclosure. The apparatus generally includes at least one processor, and at least one memory communicatively coupled with the at least one processor and storing processor-readable code. The processor-readable code, when executed by the at least one processor, may be configured to transmit a packet including at least one medium access control-control element (MAC-CE), receive hybrid automatic request (HARQ) signaling indicating whether the packet was decoded successfully, determine, in response to the HARQ signaling, whether to retransmit the at least one MAC-CE or transmit at least one other MAC-CE based on whether the packet comprises data, and transmit another packet having the at least one MAC-CE or the at least one other MAC-CE based on the determination.