Relay Station HARQ Feedback Timing Method
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Solution Overview
Problem
Existing HARQ systems lack a uniform method for triggering relay stations to calculate feedback time delays in different scenarios, particularly during downlink and uplink data retransmissions, and fail to specify how to handle uplink feedback losses, leading to complex resource scheduling and inefficient data retransmission processes.
Innovation Solution
A method where relay stations receive resource allocation messages to determine feedback timing, sending feedback or retransmission notifications through allocated channels, regardless of data receipt, ensuring uniform processing across various HARQ scenarios, including initial transmissions and retransmissions, and handling uplink feedback losses by notifying the appropriate nodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different triggering methods are used for downlink and uplink HARQ feedback in centralized relay systems, then the feedback can be adapted to specific scenario requirements, but the system complexity increases due to lack of uniform processing
Solution Approach 1:
The patent applies universality by designing a unified feedback triggering mechanism that works for both downlink and uplink HARQ scenarios. The core idea is to use a common resource allocation message format and uniform triggering logic that can handle different HARQ directions (downlink/uplink) and different states (initial transmission/retransmission) through a single standardized approach, rather than maintaining separate complex triggering mechanisms for each scenario.
2Device complexity
If uniform feedback triggering method is implemented across all HARQ scenarios, then the system complexity is reduced and processing is standardized, but the adaptability to specific scenario requirements may be limited
Solution Approach 1:
The patent applies local quality by allowing the uniform triggering mechanism to adapt its behavior based on local scenario characteristics. The resource allocation message contains scenario-specific information (such as HARQ process ID, direction indicator, retransmission flag) that enables the same basic triggering logic to correctly handle different downlink/uplink scenarios, initial transmissions, and retransmissions by adjusting parameters locally rather than requiring different overall mechanisms.
3Ease of operation
If relay stations only calculate feedback delay when receiving data to be forwarded, then the feedback process is simplified, but retransmission handling becomes problematic when no data is received
Solution Approach 1:
The patent applies preliminary action by having relay stations perform preliminary processing of resource allocation messages and prepare feedback mechanisms in advance, regardless of whether data is immediately received. The uniform triggering method ensures that relay stations are pre-configured with the necessary feedback calculation logic and resource allocation information, so they can immediately respond to retransmission scenarios without needing to recalculate or reinitialize the feedback process when data arrives.
Data Source
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AI summary
A method for relaying and forwarding feedback information in hybrid automatic repeat request scenario is provided, wherein the method for sending feedback information includes that: a relay station receives a resource allocation message; the relay station determines the time of sending the feedback information according to the resource allocation message, and sends the corresponding feedback information when the feedback time arrives. The processes of triggering the relay station to perform feedback or sending in multiple HARQ scenarios such as initial transmission and retransmission of downlink and uplink, and uplink feedback loss of subordinate node etc. are integrally and uniformly defined according to the present invention.