Orthogonal ACK/NACK Feedback Resources in Single Frequency Networks
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Solution Overview
Problem
Existing techniques for simultaneous ACK/NACK feedback from multiple base stations in single frequency networks are inadequate, leading to interference and reduced reception quality, as they fail to distinguish between feedback from different transmitters and do not allow timely and reliable feedback for preventing stalled transmissions in 3G and 4G communication systems.
Innovation Solution
Implementing a method where base stations use mutually orthogonal feedback resources for ACKs and NACKs, allowing simultaneous transmission and reception of feedback messages, using codes like '1 1' for ACK and '1 −1' for NACK, and employing code multiplexing to avoid resource wastage and increase reliability, enabling the UE to decode feedback accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple base stations transmit ACK/NACK feedback simultaneously using the same radio resources, then the feedback transmission is timely and efficient, but the reception quality deteriorates due to interference and the ability to distinguish feedback from different transmitters is lost
Solution Approach 1:
The feedback resources are segmented into mutually orthogonal resources (different time slots, frequency subcarriers, or code sequences) for different base stations. This allows simultaneous transmission from multiple base stations while maintaining the ability to distinguish and separately decode each base station's feedback signal, thereby resolving the contradiction between transmission efficiency and reception quality.
2Quantity of substance
If base stations use non-orthogonal feedback resources to increase resource utilization, then resource wastage is reduced, but the ability to simultaneously decode feedback from multiple base stations is compromised
Solution Approach 1:
Different local qualities (orthogonal resource characteristics) are assigned to feedback transmissions from different base stations. Each base station uses a specific orthogonal resource (unique time slot, frequency subcarrier, or code sequence) that is locally optimized for its transmission, while the overall system maintains high resource utilization through the structured orthogonal allocation scheme.
3Quantity of substance
If base stations coordinate to send a single feedback message, then resource wastage is avoided, but the feedback mechanism cannot prevent stalled transmissions in timely manner
Solution Approach 1:
Orthogonal feedback resources are pre-configured and allocated to each base station before the feedback transmission occurs. This preliminary arrangement enables immediate simultaneous transmission of feedback messages from multiple base stations without requiring coordination during the feedback moment, thus maintaining both resource efficiency and rapid response time to prevent stalled transmissions.
Data Source
AI summary
A method of providing feedback from a plurality of base stations of a single frequency network to a user equipment device to indicate if a data transmission has been received successfully, wherein a positive acknowledgement of successful receipt is transmitted using a first feedback resource and a negative acknowledgement of unsuccessful receipt is transmitted using a second feedback resource, the first and second feedback resources being mutually orthogonal.