Wireless Communication Apparatus Adaptive Frame Aggregation
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Solution Overview
Problem
Conventional wireless communication systems experience significant throughput degradation due to frame errors caused by severe channel fluctuations during frame aggregation, leading to reduced transmission rates.
Innovation Solution
A wireless communication apparatus that dynamically adjusts frame aggregation or fragmentation based on channel variation indices, using a transmission frame generating section to add headers and a control section to determine the data length and number of groups or segmentations according to channel conditions, thereby optimizing frame transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If frame aggregation is used to transmit data as one large frame, then throughput is improved by reducing IFS and MAC header overhead, but transmission reliability deteriorates due to increased susceptibility to frame errors from channel fluctuation
Solution Approach 1:
The patent applies dynamics by making the frame aggregation size adaptive rather than fixed. The transmitting apparatus dynamically adjusts the aggregation level based on channel conditions measured through feedback from the receiving apparatus. When channel conditions are good, larger aggregations are used to maximize throughput; when conditions deteriorate, aggregation size is reduced to maintain reliability, thus resolving the contradiction between throughput improvement and transmission reliability.
Solution Approach 2:
The patent changes the parameter of frame aggregation size based on channel conditions. By monitoring channel quality indicators and adjusting the aggregation level accordingly, the system optimizes the trade-off between throughput (benefiting from larger aggregations) and reliability (requiring smaller aggregations in poor conditions). This parameter adaptation allows the system to achieve high throughput when possible while maintaining acceptable reliability when channel conditions demand it.
2Productivity
If frame aggregation creates long frames, then overhead is reduced and throughput improves, but error propagation increases and transmission rate deteriorates significantly when frame errors occur
Solution Approach 1:
The patent applies segmentation by dividing data into appropriately sized aggregation units based on channel conditions. Instead of always using large aggregations that are prone to errors, the system segments data into smaller units when channel conditions are poor, reducing error propagation while maintaining reasonable throughput. The segmentation level is dynamically adjusted to balance between overhead reduction and error risk mitigation.
Solution Approach 2:
The patent implements beforehand cushioning by using error detection and feedback mechanisms to identify deteriorating channel conditions before catastrophic frame errors occur. The receiving apparatus monitors frame errors and provides feedback to the transmitter, allowing the system to proactively reduce aggregation size before significant data loss occurs, thus cushioning against the harmful effects of frame errors.
3Device complexity
If fixed frame aggregation is used, then system complexity is reduced, but adaptability to varying channel conditions deteriorates
Solution Approach 1:
The patent applies feedback by implementing a closed-loop control system where the receiving apparatus monitors channel conditions and frame error rates, then provides feedback information to the transmitting apparatus. Based on this feedback, the transmitter dynamically adjusts aggregation size and other transmission parameters. This feedback mechanism enables the system to adapt to varying channel conditions without requiring complex predetermined strategies for every possible scenario.
Solution Approach 2:
The patent implements self-service by enabling the communication system to automatically adjust its own transmission parameters based on observed channel conditions. The system monitors its own performance through feedback and autonomously optimizes aggregation levels without external intervention, balancing complexity and adaptability by using simple monitoring and adjustment logic rather than complex predetermined rules.
Data Source
AI summary
A wireless communication apparatus wherein the throughput is improved. In a wireless communication apparatus (100), a frame generating part (120) adds a header to a data portion to form a transport frame. A control part (190) acquires a variation index in a propagation path and decides the length of the data portion of the transport frame in accordance with the propagation path variation index. In this way, when the propagation path variation index is large, that is, the degree of propagation path variation is high, the data portion can be shortened. Contrarily, when the propagation path variation index is small, that is, the degree of propagation path variation is low, the data portion can be elongated. Thus, when the degree of propagation path variation is high and hence the probability of reception of a retransmission request from a receiving end is high, the data portion can be shortened to prevent a degradation of the throughput that would occur due to a transmission of long data. Contrarily, when the probability of reception of a retransmission request is low, a long data can be transmitted to improve the throughput.