Reference Signal Mapping for Flexible Wireless System Bandwidth
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Solution Overview
Problem
In the New Radio (NR) system, the flexible design leads to increased complexity for User Equipment (UE) processing, making it difficult for UE to acquire Reference Signal (RS) sequences on monitored frequency domain resources without knowing the position of these resources within the system bandwidth, hindering channel estimation.
Innovation Solution
The method involves UE receiving a radio signal with RS sequences mapped from lower to higher frequency, where the positions of frequency domain sub-resources are unfixed, allowing UE to correctly receive RS sequences and perform channel estimation without knowing the exact position, by using reference sequences and downlink information to determine the frequency domain resource positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a flexible system design is adopted for NR system, then the system can serve future requirements and maintain forward compatibility, but the UE processing complexity increases and the UE cannot acquire RS sequences on monitored frequency domain resources
Solution Approach 1:
The frequency domain resource is divided into multiple sub-resources, and the RS sequence is segmented to be transmitted on these sub-resources. The UE can acquire the RS sequence by monitoring the specific sub-resources indicated by downlink information, rather than monitoring the entire frequency domain resource, thus reducing UE processing complexity while maintaining system flexibility
Solution Approach 2:
Downlink information acts as an intermediary that carries the position information of frequency domain sub-resources. The base station uses downlink information to indicate which sub-resources contain RS sequences, and the UE uses this downlink information to locate and acquire the RS sequences without having to search the entire frequency domain resource, thereby reducing complexity
2Adaptability or versatility
If system information is not transmitted on a specific frequency domain resource, then the system maintains flexibility, but the UE cannot determine the position of monitored frequency domain resources in the whole system bandwidth
Solution Approach 1:
Downlink information serves as an intermediary carrier that conveys the position information of frequency domain sub-resources. Instead of transmitting system information on a specific frequency domain resource, the base station uses downlink information to indicate the positions, allowing the UE to acquire the necessary position information without restricting system flexibility
Solution Approach 2:
The base station performs preliminary action by sending downlink information that contains the position information of frequency domain sub-resources before the UE needs to acquire the RS sequences. This preliminary provision of position information enables the UE to efficiently locate and acquire the RS sequences without having to search the entire system bandwidth
3Adaptability or versatility
If the UE monitors different frequency domain resources to receive system information, then the system maintains flexibility, but the UE cannot perform channel estimation without knowing the exact position of resources
Solution Approach 1:
Downlink information acts as an intermediary that provides the position information of frequency domain sub-resources to the UE. With this position information, the UE can accurately locate the RS sequences on the monitored frequency domain resources and perform channel estimation with high precision, while the system maintains its flexibility through the flexible allocation of frequency domain resources
Solution Approach 2:
The patent replaces the mechanical search process (where the UE would have to search the entire frequency domain resource to find RS sequences) with an information-based approach. The downlink information provides the position information directly, allowing the UE to jump to the correct location and perform channel estimation without exhaustive search, thereby improving measurement precision while maintaining system flexibility
Data Source
AI summary
A method and a device in a User Equipment (UE) and a base station used for wireless communication systems that support broadcast signals. The UE receives a first radio signal on a first time-frequency resource. The first radio signal comprises a first RS sequence, RSs in the first RS sequence are mapped from lower frequency to higher frequency in frequency domain, the first time-frequency resource belongs to a first frequency domain resource. The first frequency domain resource comprises K frequency domain sub-resource(s). (A) Position(s) of the K frequency domain sub-resource(s) in the first frequency domain resource is(are) unfixed, RSs of the first RS sequence in a given frequency domain sub-resource are not related to a position of the given frequency domain sub-resource in the first frequency domain resource. Therefore, the UE is able to correctly receive RSs even without knowing the position of frequency domain resources in the system bandwidth.