Rate-Splitting Device Cooperation for Selective Data Retransmission
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Solution Overview
Problem
Existing cooperative rate splitting (CRS) technologies face inefficiencies in HARQ processes due to the inability to effectively utilize cooperation between terminal devices for common and private data streams, leading to unnecessary retransmissions and resource wastage.
Innovation Solution
Implement a cooperative feedback mechanism where terminal devices share decoding results to allow re-decoding of common and private data, enabling the network device to adjust retransmission logic based on separate feedback indications for common and private data, thereby optimizing retransmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If cooperative rate splitting is implemented without separate feedback indications for common and private data, then the system complexity is reduced, but unnecessary retransmissions occur and spectral efficiency deteriorates
Solution Approach 1:
The feedback mechanism is segmented into separate feedback indications for common data and private data. Each terminal device sends distinct feedback for common data reception status and private data reception status, enabling the network device to make differentiated retransmission decisions for each data type, thereby reducing unnecessary retransmissions and improving spectral efficiency.
Solution Approach 2:
A cooperative feedback mechanism is implemented where terminal devices provide feedback indications to the network device about the reception status of common and private data. The network device uses this feedback to intelligently determine whether retransmission is necessary, resolving the contradiction between reducing energy loss and managing feedback complexity.
2Reliability
If retransmission is performed for both common and private data whenever any decoding fails, then reliability is improved, but resource wastage increases and network capacity decreases
Solution Approach 1:
The retransmission decision is made with local quality differentiation: the network device determines separately whether retransmission is needed for common data and private data based on specific feedback indications. This allows selective retransmission only when necessary for each data type, maintaining reliability while avoiding unnecessary resource consumption that would reduce network capacity.
3Use of energy by moving object
If terminal devices independently decode common and private data without cooperation, then device complexity is reduced, but power efficiency deteriorates due to increased retransmissions
Solution Approach 1:
The decoding and feedback processes of multiple terminal devices are merged into a cooperative system. Terminal devices jointly provide feedback indications about common and private data reception, enabling the network device to make optimized retransmission decisions that reduce overall power consumption in the system, while each device maintains manageable complexity through standardized feedback procedures.
Data Source
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AI summary
Embodiments of the present disclosure are directed to cooperation between devices in rate splitting. A method comprises: at a first apparatus, receiving, from a third apparatus, configuration information indicating a cooperation mode with a second apparatus in decoding data from the third apparatus; decoding, from the received signal, common data and first private data; transmitting, to the third apparatus and based on a result of the decoding, first feedback information for the common data and the first private data; receiving a decoding result of the common data from the second apparatus; in accordance with a determination of a negative acknowledgement, re-decoding at least one of the common data or the first private data based on the received signal and the decoding result of the common data; and transmitting, to the third apparatus, second feedback information for the common data and/or the first private data.