Precoding Patterns for Wireless Channel Repetitions
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Solution Overview
Problem
Current wireless communication technologies, such as LTE and 5G, face challenges in improving data transmission reliability, particularly in noisy environments and poor channel conditions, due to limitations in precoding techniques for shared channel transmission repetitions.
Innovation Solution
The implementation of specific precoding patterns for shared channel transmission repetitions, including inter-slot, intra-slot, and hybrid-slot repetitions, with different precoders applied to each repetition to enhance spatial diversity and improve data transmission reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same precoder is used for all repetitions of a physical channel, then channel estimation is simplified and processing overhead is reduced, but transmission reliability deteriorates in noisy environments and poor channel conditions
Solution Approach 1:
The patent applies dynamics by transitioning from a static precoder (same precoder for all repetitions) to a dynamic precoding scheme where different precoders are applied to different repetitions. The precoder varies according to a defined pattern across repetitions, allowing the system to adapt to changing channel conditions while maintaining manageable complexity through predetermined patterns.
Solution Approach 2:
The patent changes the precoder parameter across different repetitions of the physical channel. Specifically, different precoders (e.g., different precoding matrices or vectors) are applied to different repetitions according to a defined pattern, which enhances transmission reliability by providing diversity in the spatial domain without requiring complex real-time channel estimation for each repetition.
2Reliability
If different precoders are applied to each repetition to enhance spatial diversity, then transmission reliability improves, but processing overhead and device complexity increase
Solution Approach 1:
The patent segments the repetitions into groups where different precoders are applied to different segments. By dividing the repetitions and applying different precoders to different segments according to a defined pattern, the system achieves spatial diversity while managing complexity through structured segmentation rather than requiring unique precoders for every single repetition.
Solution Approach 2:
The patent implements periodic action by applying precoders in a repeating pattern across multiple repetitions. The precoding pattern cycles through a set of precoders, providing diversity benefits while reducing processing complexity compared to completely arbitrary precoder selection. This periodic structure allows receivers to anticipate and efficiently process the varying precoders.
3Reliability
If channel estimation is performed for each repetition with different precoders, then transmission reliability improves, but processing overhead and time consumption increase
Solution Approach 1:
The patent applies preliminary action by establishing predetermined precoding patterns before transmission begins. The precoders are selected according to a predefined pattern known to both transmitter and receiver, allowing the receiver to prepare for the sequence of precoders in advance. This reduces the need for complex real-time channel estimation for each repetition, as the pattern itself provides structural information that aids estimation.
Solution Approach 2:
The patent uses copying by reusing reference signals and channel estimation techniques across repetitions with different precoders. The receiver can estimate the channel for one precoder and use that estimation as a basis for estimating channels for other precoders in the pattern, reducing the total time and processing required compared to performing completely independent estimations for each repetition.
Data Source
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AI summary
Certain aspects of the present disclosure provide techniques for applying precoding patters to shared channel transmission repetitions. In one example, a method of transmitting data from a device in a wireless communication network, includes: determining a number of repetitions to transmit data in the wireless communication network; determining a precoding pattern that specifies a precoder to be applied to each repetition of the number of repetitions; and transmitting the data according to the number of repetitions and according to the precoding pattern.