Codeword Layer Mapping in Wireless Communication Systems
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Solution Overview
Problem
Current wireless communication systems, such as LTE, face challenges in efficiently mapping codewords to layers due to varying channel states, leading to increased latency and overhead in data transmission, especially in next-generation communication systems requiring flexible frequency band use and reduced power consumption.
Innovation Solution
A method and device for receiving downlink signals in a wireless communication system, where a user equipment (UE) receives initial codewords through a specific number of layers, transmits negative acknowledgments, and receives retransmitted codewords through fewer layers than initially used, optimizing codeword-to-layer mapping based on channel states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple codewords are transmitted through multiple layers, then data transmission capacity is improved, but latency and overhead increase
Solution Approach 1:
The patent applies dynamics by making the codeword-to-layer mapping flexible and adaptive rather than fixed. The base station can dynamically adjust which codewords are mapped to which layers based on real-time channel state information, allowing the system to optimize between transmission capacity and latency for each specific transmission scenario.
Solution Approach 2:
The patent changes the parameter of codeword-to-layer mapping configuration based on channel conditions. By varying the mapping relationship between codewords and layers according to channel state information, the system can reduce overhead and latency while maintaining high transmission capacity through optimized resource allocation.
2Device complexity
If fixed codeword-to-layer mapping is used, then system complexity is reduced, but adaptability to varying channel states deteriorates
Solution Approach 1:
The patent transitions from a fixed mapping approach to a dynamic mapping approach where the base station adjusts codeword-to-layer assignments based on real-time channel state information. This dynamic adaptation allows the system to maintain high channel conditions without requiring overly complex fixed configuration for all possible scenarios.
Solution Approach 2:
The patent implements feedback mechanisms where the base station receives channel state information from the user equipment and uses this feedback to adjust the codeword-to-layer mapping. This feedback loop enables the system to adapt to varying channel conditions while managing complexity through informed decision-making rather than pre-configured solutions for all conditions.
3Reliability
If more layers are used for codeword transmission, then transmission reliability is improved, but power consumption increases
Solution Approach 1:
The patent applies parameter changes by adjusting the number of active layers and codeword mapping based on channel state information. When channels are good, the system can use fewer layers with higher reliability; when channels deteriorate, it can dynamically increase layer utilization to maintain reliability, thereby optimizing power consumption across varying transmission conditions.
Solution Approach 2:
The patent makes the layer activation dynamic rather than static. The base station can dynamically activate or deactivate specific layers based on real-time channel conditions, allowing the system to maintain transmission reliability through adaptive layer selection while minimizing power consumption by avoiding unnecessary layer activation when conditions permit.
Data Source
AI summary
The present application discloses a method for a terminal to receive a downlink signal including at least one code word in a wireless communication system. Particularly, the method is characterized by: a step of receiving a first code word, through a first number of layers, and a second code word, through a second number of layers, which have been newly transmitted from a base station; a step of transmitting, to the base station, a negative acknowledgement for one of the first code word and the second code word; and receiving, from the base station, a code word which has been re-transmitted in response to the negative acknowledgement, and a third code word which has been newly transmitted, wherein the number of layers for receiving the re-transmitted code word is equal to the number of layers involved in the new transmission thereof.