Persistent Resource Allocation Error Correction via Shared NACK Feedback
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in resource allocation due to the high overhead required for requesting and granting resources for discontinuous communications, which can be minimized by implementing persistent resource allocation schemes, while maintaining flexibility and reducing the need for continuous requests.
Innovation Solution
The system employs persistent downlink or uplink resource allocation, where allocations remain valid for multiple frames, reducing the need for repeated requests, and includes error correction mechanisms using NACK messaging to handle map errors efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If discontinuous transmission is implemented to improve resource efficiency, then resource utilization is improved, but the overhead for requesting and granting resources increases
Solution Approach 1:
The system pre-allocates persistent resources to client stations based on predicted periodic traffic patterns (such as VOIP). This preliminary action eliminates the need for continuous resource request-grant exchanges, as resources are reserved in advance for the duration of the persistent allocation period, thereby reducing overhead while maintaining high resource utilization during the allocation window.
Solution Approach 2:
Persistent resource allocations are established for periodic time intervals rather than continuously. The base station allocates resources periodically for predetermined durations, and client stations use these resources during their allocated periods without needing to request them each time. This periodic structure reduces the frequency of control signaling while maintaining efficient resource utilization during active transmission windows.
2Productivity
If persistent resource allocation is used to reduce overhead, then resource efficiency is improved, but flexibility in accessing resources is reduced
Solution Approach 1:
The persistent resource allocation system incorporates dynamic elements through NACK (Negative Acknowledgment) channels that allow client stations to request retransmission or modification of allocation parameters. The base station can dynamically adjust persistent allocations based on changing traffic conditions, client station feedback, and network load, thereby maintaining flexibility while preserving the efficiency benefits of persistent allocation.
Solution Approach 2:
The system implements feedback mechanisms where client stations send NACK messages to the base station when they detect errors or need resource adjustments. The base station uses this feedback to determine whether to retransmit allocation information or modify persistent allocation parameters, allowing the system to adapt to changing conditions while maintaining the overall persistent allocation structure that provides resource efficiency.
3Quantity of substance
If resource requests are minimized to reduce overhead, then bandwidth availability is improved, but error detection and correction capability is reduced
Solution Approach 1:
The NACK channel serves as an intermediary mechanism that allows error detection and correction without requiring full resource request-grant sequences. When errors are detected in persistent allocations or data transmissions, client stations can send concise NACK messages through this dedicated feedback channel, and the base station can respond with targeted retransmissions or corrections, maintaining reliability while preserving bandwidth availability.
Data Source
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AI summary
Methods and apparatus for communicating and utilizing persistent allocation of resources are described herein. A base station can allocate persistent resources to a client station, and can associate the client station or persistent resource allocation with a particular shared NACK channel. The base station can monitor the NACK channel for a NACK indicating a map error. The base station can also monitor the resource allocation to implicitly determine a map error. The base station can resend one or more persistent resource allocation information elements in response to the NACK or implicit error determination. A client station having a persistent resource allocation can monitor persistent resource allocation information elements in map messages and can indicate failure to receive a persistent resource allocation information element in a NACK message on a preassigned share NACK channel.