HARQ Feedback Mechanism for Wireless Protocol Synchronization
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Solution Overview
Problem
Hybrid Automatic Repeat Request (HARQ) systems in wireless communication systems lack feedback mechanisms between the physical layer and higher layers, leading to delays and inefficiencies in retransmissions due to the inability to adapt to changing channel conditions and synchronize communications between base stations and mobile stations.
Innovation Solution
Implementing a technique to provide HARQ feedback to higher layer protocols, allowing for immediate correction and synchronization by detecting HARQ failures and retransmitting data bursts or packets, thereby reducing delays and improving communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If HARQ operates independently without feedback to higher layers, then physical layer retransmission is simplified, but higher layer protocols cannot detect or respond to delivery failures in a timely manner
Solution Approach 1:
The patent implements a feedback mechanism where the physical layer sends HARQ status information (ACK/NACK) to higher layer protocols. This allows higher layers to detect delivery failures timely and initiate recovery mechanisms, resolving the contradiction by adding feedback capability that enables timely detection without significantly complicating the overall system architecture.
2Adaptability or versatility
If higher layer protocols use their own retransmission mechanisms without HARQ feedback, then protocol independence is maintained, but retransmission delays increase significantly
Solution Approach 1:
The patent enables higher layer protocols to receive HARQ feedback information, allowing them to make informed retransmission decisions. This feedback mechanism improves productivity by enabling timely detection and response to delivery failures while maintaining protocol independence, as each layer can still operate autonomously but with enhanced awareness of lower layer status.
Solution Approach 2:
The patent allows higher layer protocols to prepare for retransmission by receiving advance HARQ feedback information before actual delivery failures occur. This preliminary awareness enables protocols to pre-position recovery mechanisms, reducing overall retransmission delays while maintaining the flexibility of independent protocol operation.
3Device complexity
If HARQ does not rebuild bursts on retry attempts, then physical layer processing is simplified, but coding schemes cannot adapt to changing channel conditions
Solution Approach 1:
The patent introduces dynamic adaptability at the higher layer by receiving HARQ feedback information that indicates channel conditions and delivery status. This enables higher layer protocols to dynamically adjust their retransmission strategies and coding schemes based on real-time feedback, resolving the contradiction by adding adaptability without significantly complicating the physical layer HARQ processing.
4Device complexity
If control plane waits for timer timeout to detect MAC management message failure, then implementation is simplified, but significant delays occur before correction
Solution Approach 1:
The patent implements a feedback mechanism where the physical layer provides real-time HARQ status information to the control plane. This eliminates the need to wait for timer timeouts by directly informing higher layers of delivery failures, significantly reducing correction time while maintaining implementation simplicity through the use of existing HARQ feedback infrastructure.
Data Source
AI summary
A method is described for providing Hybrid Automatic Repeat Request (HARQ) transmission feedback to a higher layer protocol in a communication system. The method includes a step of detecting HARQ retransmissions in a first layer protocol. This can be used to determine a HARQ failure or an HARQ ACK after a delay of some retransmissions. A next step includes providing feedback information about the detecting step from the first layer protocol to a higher layer protocol. A next step includes instituting corrections at the higher layer protocol, in response to the information transferred from the first layer protocol. These corrections can include immediate retransmission of those bursts of a HARQ failure, or correcting timers to match the delay of eventually ACK'ed data.