LTE PRS Rate Matching for 5G NR DSS Positioning
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Solution Overview
Problem
Current Dynamic Spectrum Sharing (DSS) techniques cannot accommodate Positioning Reference Signals (PRS) effectively, as they are not regularly scheduled and are configuration-based, leading to challenges in decoding NR data and control signals when LTE PRS is transmitted.
Innovation Solution
The implementation of a method where a user equipment (UE) receives LTE PRS rate matching information from a 5G NR network, allowing it to decode and process NR data and control signals by rate matching around LTE PRS transmissions, and optionally receiving a muting pattern for LTE PRS to enable seamless data transmission during muted PRS periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If LTE PRS is transmitted in frequency bands shared with 5G NR using DSS, then positioning functionality is maintained, but decoding of NR data and control signals becomes challenging
Solution Approach 1:
The base station provides rate matching information to the UE in advance, before the actual NR data transmission. This preliminary action allows the UE to pre-configure its decoding process to account for LTE PRS transmissions, thereby maintaining both positioning functionality and successful NR signal decoding without real-time interference
Solution Approach 2:
Rate matching information acts as an intermediary between the LTE positioning system and the 5G NR data transmission system. It conveys the temporal and spectral characteristics of LTE PRS to the NR receiver, enabling the UE to navigate around PRS transmissions and successfully decode NR signals while LTE positioning continues uninterrupted
2Productivity
If NR data and control signals are transmitted on frequency bands shared with LTE, then bandwidth utilization efficiency is improved, but interference with LTE PRS occurs
Solution Approach 1:
The shared frequency band is segmented in the time domain through rate matching patterns that divide available resources into LTE PRS transmission slots and NR data transmission slots. This segmentation allows both systems to operate simultaneously without mutual interference, maximizing bandwidth utilization while protecting LTE positioning signals
Solution Approach 2:
The system dynamically changes transmission parameters (rate matching patterns, muting configurations) based on whether LTE PRS is being transmitted. When LTE PRS is active, NR transmissions are adjusted to avoid conflicting time-frequency resources, thereby eliminating interference while maintaining efficient spectrum usage
3Ease of operation
If LTE PRS rate matching information is provided to UE, then NR data decoding is enabled, but system complexity increases
Solution Approach 1:
The base station automatically generates and provides rate matching information based on its own LTE PRS transmission schedule. The UE simply receives this information and applies it to its decoding process without requiring complex coordination or additional signaling protocols. This self-service approach enables NR decoding while minimizing system complexity
Data Source
AI summary
A user equipment (UE) is configured to be connected to a 5G New Radio (NR) network that shares one or more frequency bands using dynamic spectrum sharing (DSS) with a Long Term Evolution (LTE) network that is transmitting LTE positioning reference signal (PRS). The UE may receive LTE PRS rate matching information from the NR network, such as the LTE PRS configuration data or an LTE PRS rate matching pattern. The UE may decode and process NR data signals and control signals transmitted by the NR network while LTE PRS is transmitted by rate matching around the LTE PRS in accordance with the LTE PRS rate matching information. The LTE PRS muting pattern may be adjusted based on NR data or control signals, and the UE may receive and process NR data and control signals transmitted while the LTE PRS is muted.