Uplink Reference Signal Distinction in Shared Wireless Resources
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Solution Overview
Problem
In conventional technologies, when multiple terminal devices in the same cell transmit uplink data on a shared resource, they generate the same reference signals, making it impossible for the network device to distinguish between them and correctly demodulate their uplink data.
Innovation Solution
The method involves each terminal device determining an index for a reference sequence based on a unique parameter value, allowing them to generate distinct reference signals. This ensures that even when multiple terminal devices transmit on the same time-frequency resource, the network device can differentiate their reference signals and correctly demodulate their data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multiple terminal devices use the same reference signal generation method on shared resources, then device complexity is reduced, but the network device cannot distinguish between different terminal devices
Solution Approach 1:
The patent applies local quality by making the reference signal generation process device-specific. Each terminal device uses its own unique identifier (such as cell ID, device ID, or other distinguishing parameters) to generate a distinct reference signal sequence. This ensures that while the overall system maintains simplicity, each local instance (terminal device) produces a uniquely identifiable reference signal that can be distinguished by the network device.
Solution Approach 2:
The patent implements parameter changes by modifying the reference signal generation parameters based on terminal device characteristics. Specifically, the initialization parameters or sequence generation parameters of the reference signal are changed according to each terminal device's unique identifier. This allows the network device to distinguish between different terminal devices while maintaining a relatively simple generation process at each device.
2Productivity
If terminal devices transmit on shared time-frequency resources, then spectrum utilization is improved, but interference between devices increases
Solution Approach 1:
The patent applies segmentation by dividing the reference signal space into distinct segments for different terminal devices. Each terminal device is assigned a unique reference signal sequence or parameter set, effectively segmenting the overall reference signal domain. This segmentation allows multiple devices to share time-frequency resources while maintaining distinguishability, thereby reducing mutual interference.
Solution Approach 2:
The patent uses the terminal device's unique identifier as an intermediary parameter in the reference signal generation process. This intermediary element mediates between the need for shared resources and the need for distinguishability. By incorporating this intermediary parameter into the reference signal generation, the system enables multiple devices to share resources while the network device can still distinguish and separately process signals from different devices.
Data Source
AI summary
Embodiments of this application provide a method for receiving and sending a reference signal, an apparatus, and a system, so that a network device can correctly demodulate uplink data of different terminal devices of a same cell. This solution is applicable to a wireless communications system including a first cell. The first cell includes a plurality of terminal devices that can transmit uplink data on a same time-frequency resource. A first terminal device in the plurality of terminal devices determines an index of a first sequence based on a first parameter value, and generates a first reference signal based on the first sequence indicated by the index of the first sequence. Then, the first terminal device sends the first reference signal to the network device. The first parameter value is different from a parameter value corresponding to another terminal device in the plurality of terminal devices.