Cooperative Relay Resource Sharing for Data Balance
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Solution Overview
Problem
Existing cooperative relay systems face issues with data disproportionateness at the base station when one repeater fails to exchange data, leading to a loss of diversity effect.
Innovation Solution
The system allows resource sharing between repeaters, where a repeater that fails to exchange data opens its resources to the partner repeater, enabling the base station to receive balanced data even if one repeater is unsuccessful, by allocating different resources for data transmission and using ACK/NACK signals to manage data exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a repeater transmits parity data after unsuccessful data exchange, then data transmission continues, but data disproportionateness occurs at the base station
Solution Approach 1:
The system dynamically adjusts transmission behavior based on exchange success status. Successful repeaters transmit only their first transmission data, while unsuccessful repeaters transmit both first transmission data and parity data. This dynamic adaptation resolves the contradiction by allowing continued transmission while maintaining data balance through selective transmission based on actual exchange outcomes.
2Reliability
If ACK/NACK signals are introduced to manage data exchange, then transmission reliability improves, but system complexity increases
Solution Approach 1:
The system extracts and utilizes only the necessary feedback information (ACK/NACK signals) from the data exchange process. By taking out just the success/failure indication rather than implementing complex feedback mechanisms, the system achieves improved reliability while minimizing the addition of complexity. The base station uses this extracted information to determine which repeaters need to transmit parity data.
Data Source
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AI summary
There are provided a communication device, a base station, a communication system, and a communication method that make it possible to yield a diversity effect by cooperative relay without involvement of disproportionateness in data received by an eNB even when one of parties has unsuccessfully exchanged data. After received an ACK signal from a repeater 1, a repeater 2 which has transmitted a NACK signal in procedure 7 transmits data S2 to the eNB by use of its own resource, thereby making its own resource available for the repeater 1 (the repeater 2 does not use its own resource, and the repeater 1 uses the resource of the repeater 2). In procedures 8, the repeater 1 has received the NACK signal from the repeater 2 and subsequently transmits data S1 to the eNB by use of its own resource. Subsequently, the repeater 1 which has received the NACK signal in procedure 9 determines that the resource of the repeater 2 is available and transmits data P1 to the eNB by use of the resource of the repeater 2. In procedure 10, the repeater 1 transmits previously-generated data P2 to the eNB by use of its own resource.