Adaptive RSMA Transmission Using Shared Redundancy for Low-Latency Reliability
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Solution Overview
Problem
Existing RSMA-based wireless communication networks face challenges in achieving high reliability with low latency, particularly in scenarios with imperfect channel state information, leading to increased latency in networks like non-terrestrial and ultra-reliable low latency communication systems.
Innovation Solution
The proposed method involves splitting user messages into common and private parts, generating redundancy versions of the data, and transmitting these along with encoded data on different beams, utilizing forward error correction coding to enhance reliability without retransmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional RSMA is used in wireless communication networks, then multiple users can be served simultaneously, but reliability is insufficient and latency increases particularly in non-terrestrial and ultra-reliable low latency communication systems
Solution Approach 1:
The patent segments user data into common parts and private parts, where common parts are shared across multiple users and private parts are user-specific. This segmentation enables the system to transmit redundancy versions of common parts that can be used for error correction without requiring retransmissions, thereby improving reliability while maintaining low latency.
Solution Approach 2:
The patent generates and transmits redundancy versions of common data parts in advance as part of the initial transmission. These redundancy versions are prepared beforehand and included in the common stream, allowing receivers to perform error correction without waiting for retransmissions, thus reducing latency while improving reliability.
2Reliability
If redundancy versions are transmitted for each user data, then error correction capability is improved, but transmission time and complexity increase
Solution Approach 1:
The patent merges redundancy information by transmitting redundancy versions of common data parts that are shared across multiple users. Instead of transmitting separate redundancy versions for each user, the system combines them into a single common stream, which reduces transmission time while maintaining error correction capability through the shared redundancy.
Solution Approach 2:
The common data parts and their redundancy versions serve multiple functions: they provide error correction for all users simultaneously, enable interference cancellation through successive interference cancellation (SIC), and reduce overall transmission time by avoiding redundant retransmissions. This multi-functionality improves reliability without proportionally increasing transmission time.
Data Source
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AI summary
The present disclosure relates to methods and apparatuses for transmitting and/or receiving data. For example a data transmitting includes obtaining first data addressed to a first wireless device and second data addressed to a second wireless device different from the first wireless device; generating a first redundancy version from the first data and a second redundancy version from the second data; obtaining common data as a separable combination of the first redundancy version and the second redundancy version; and obtaining encoded first data by forward error correction code, FEC, encoding, of the first data and obtain encoded second data by FEC encoding of the second data. The transmitter then transmits a signal carrying the encoded first data, the encoded second data, and the common data at the same time on different beams. Correspondingly, a user parses the common and the private data and combines them.