Superposition Coding Signal Demodulation via Notification Signaling
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Solution Overview
Problem
Superposition coding technology cannot be applied in existing communication systems such as LTE, UMTS, and CDMA due to limitations in demodulation interference and UE functionality requirements.
Innovation Solution
A method where a base station generates a superposition coding signal and sends notification signaling to UEs, instructing them to select specific bits and demodulation schemes, allowing UEs to demodulate data without the need for successive interference cancellation (SIC) functions, thereby reducing restrictive requirements on UE functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If superposition coding technology is applied to improve system throughput, then data transmission efficiency is improved, but demodulation interference occurs and UE functionality requirements increase
Solution Approach 1:
The patent segments the superposed signal into distinct layers with different power levels, where the first signal layer uses higher power and the second signal layer uses lower power. This segmentation allows UEs to selectively demodulate only their intended signal layer without being affected by the other layer, thereby resolving the demodulation interference problem while maintaining high throughput.
Solution Approach 2:
The patent applies local quality by assigning different power levels to different signal layers. The first signal layer is transmitted with higher power quality suitable for UEs with poor channel conditions, while the second signal layer is transmitted with lower power quality suitable for UEs with good channel conditions. This localized quality differentiation enables UEs to demodulate their intended signals without interference from other layers.
2Productivity
If superposition coding technology is applied to improve system throughput, then data transmission efficiency is improved, but UE functionality requirements increase
Solution Approach 1:
The patent segments the communication system into different UE categories based on their demodulation capabilities. First UEs are configured to demodulate only the first signal layer, while second UEs are configured to demodulate only the second signal layer. This segmentation simplifies UE functionality requirements by allowing each UE type to implement only the necessary demodulation capabilities rather than requiring all UEs to handle multiple layers.
Solution Approach 2:
The patent extracts the SIC (Successive Interference Cancellation) functionality from the UE and relocates it to the network side. The network side performs the complex signal separation and demodulation operations, while UEs only need to perform simpler demodulation of their intended signal layer. This extraction reduces UE complexity while maintaining the throughput benefits of superposition coding.
3Productivity
If notification signaling with data selection information is sent to UEs, then data acquisition efficiency is improved, but signaling overhead increases
Solution Approach 1:
The patent extracts the data selection information from general notification signaling and creates a dedicated field in the DCI (Downlink Control Information) format. This dedicated field efficiently conveys the starting position and length of the data to be acquired by the UE, improving data acquisition efficiency while minimizing signaling overhead through compact encoding.
Solution Approach 2:
The patent changes the parameter representation by using a compact field in DCI that directly specifies the data position and length parameters. Instead of using verbose notification signaling, the system uses optimized parameter encoding where the data selection information is represented by concise bit fields that can be efficiently parsed by the UE, thereby improving data acquisition efficiency without significant signaling overhead.
Data Source
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AI summary
The present invention relates to the field of wireless communications, and discloses a superposition coding method, apparatus, and system, which can implement application of a superposition coding technology in systems such as an LTE system, a UMTS system, and a CDMA system. The method of the present invention includes: generating a superposition coding Superposition Coding signal according to bit data to be separately sent to the at least two user equipments UEs; sending notification signaling to at least one UE in the at least two UEs, where the notification signaling carries data selection information, and the data selection information is used for instructing the UE to acquire, from bit data demodulated from the superposition coding signal, at least one bit of data that is of a specific quantity and at a specific location as received data; and sending the superposition coding signal to the at least two UEs. The present invention is mainly applied in a demodulation process of a superposition coding signal.