MAC Layer Priority Adjustment via Physical Layer Feedback
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Solution Overview
Problem
Inconsistent prioritizations between the MAC layer and the physical layer in wireless communication systems can lead to situations where prioritized MAC PDUs are not transmitted, causing transmission issues due to the MAC layer's incorrect assumption of successful transmission.
Innovation Solution
The physical layer delivers indication information to the MAC layer when a MAC PDU is not transmitted, allowing the MAC layer to adjust the priority of the data from prioritized to de-prioritized, thereby enabling re-transmission opportunities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the physical layer determines data as de-prioritized and does not transmit it, then transmission resources are saved for higher priority data, but the MAC layer incorrectly assumes successful transmission leading to data loss
Solution Approach 1:
The physical layer sends indication information to the MAC layer to feedback the actual transmission status. When the physical layer determines data as de-prioritized and does not transmit it, it notifies the MAC layer through indication information, allowing the MAC layer to correct its assumption and handle the data appropriately (retransmission or marking as lost).
Solution Approach 2:
The indication information is delivered in advance to notify the MAC layer about the transmission status before the MAC layer proceeds with subsequent operations. This preliminary notification allows the MAC layer to adjust its behavior proactively rather than reacting to transmission failures later.
2Speed
If the MAC layer determines data as prioritized and transmits it, then data transmission priority is maintained, but the physical layer may not transmit it due to conflicting priority rules causing inconsistent prioritization
Solution Approach 1:
The physical layer provides feedback to the MAC layer about the actual transmission decisions made at the physical layer. This feedback loop reveals the inconsistency between MAC layer prioritization and physical layer prioritization, allowing the system to identify and handle cases where prioritization rules conflict between layers.
Solution Approach 2:
The indication information acts as an intermediary mechanism that bridges the MAC layer and physical layer, conveying the actual transmission status from the physical layer to the MAC layer. This intermediary enables coordination between the two layers and resolves the inconsistency by making the physical layer's decision visible to the MAC layer.
3Loss of information
If indication information is delivered from physical layer to MAC layer, then transmission status visibility is improved, but system complexity increases due to additional signaling
Solution Approach 1:
The indication information serves multiple functions: it notifies the MAC layer about transmission status, enables the MAC layer to correct prioritization assumptions, and provides a mechanism for inter-layer coordination. By consolidating these functions into a single signaling mechanism, the complexity is minimized while achieving multiple objectives.
Solution Approach 2:
The system uses its existing signaling infrastructure to carry the indication information, rather than introducing completely new communication mechanisms. The indication information leverages existing uplink signaling paths from the terminal to the network, allowing the system to serve itself with minimal additional complexity.
Data Source
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AI summary
The present disclosure relates to the field of wireless communication, and discloses a data transmission method and apparatus, a terminal device, and a storage medium. The method is applied in a terminal device including a Medium Access Control (MAC) layer and a physical layer. The method includes: delivering, by the physical layer, indication information to the MAC layer; adjusting, by the MAC layer based on the indication information, a priority of data at the MAC layer from prioritized to de-prioritized; and re-transmitting the data; or adjusting, by the MAC layer based on the indication information, a priority of a Scheduling Request (SR) at the MAC layer from prioritized to de-prioritized; and re-transmitting the SR. With the method according to an embodiment of the present disclosure, the indication information delivered from the physical layer to the MAC layer allows data (or an SR) that is not actually transmitted at the physical layer to be re-determined, by the MAC layer, as de-prioritized data (or a de-prioritized SR) to obtain a transmission opportunity for re-transmission.