Beam-Filtered RSRP Measurement for Small Data Timing Validation
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Solution Overview
Problem
Communicating small amounts of data in a radio resource control (RRC) connected state with a cellular wireless network is inefficient, and there is a need for mechanisms to manage timing advance (TA) validation and beam filtering for small data transmission (SDT) in an RRC inactive state.
Innovation Solution
A wireless device measures and filters reference signal received power (RSRP) values using beam sweeping and physical layer one (L1) filtering to validate TA values before sending SDT, with configurations provided by the cellular network through RRC release, MAC CE, and RAR messages, and updates RSRP values based on specific triggers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wireless device transmits small amounts of data while in an RRC connected state, then communication quality can be maintained, but signaling overhead increases and system efficiency decreases
Solution Approach 1:
The patent extracts the essential function of maintaining communication quality (TA validation) from the full RRC connected state, allowing data transmission to occur in the lighter RRC inactive state. This separation enables small data transmissions without the overhead of maintaining a full connected state, thus improving system efficiency while preserving necessary communication quality through selective TA validation.
Solution Approach 2:
The patent performs TA validation and RSRP measurement in advance before data transmission occurs. By validating the TA value and measuring reference signals beforehand, the system ensures communication quality is maintained while allowing subsequent small data transmissions to proceed efficiently in the RRC inactive state without requiring full connection overhead.
2Measurement precision
If a wireless device performs TA validation by measuring reference signals at multiple times and via multiple antennas, then timing alignment accuracy improves, but measurement complexity and processing overhead increase
Solution Approach 1:
The patent combines multiple RSRP measurements taken at different times and via different antennas into a single filtered RSRP value using L1 filtering. This merging approach maintains timing alignment accuracy by considering multiple measurement dimensions while reducing the complexity of processing individual measurements separately, as the filter produces a single representative value for TA validation.
Solution Approach 2:
The patent transforms multiple raw RSRP measurement parameters (time-varying measurements from multiple antennas) into a single filtered parameter through L1 filtering. This parameter transformation reduces measurement complexity by converting a multi-dimensional measurement set into a single processed value that retains the essential timing alignment information while simplifying subsequent validation processing.
3Reliability
If a wireless device filters RSRP values using L1 filtering before TA validation, then measurement reliability improves, but processing time and computational resources increase
Solution Approach 1:
The patent performs L1 filtering of RSRP values in advance during the TA validation process before actual data transmission occurs. By pre-filtering the measurements and establishing a reliable baseline RSRP value beforehand, the system improves measurement reliability for future transmissions while minimizing processing time during critical data transmission moments, as the filtering work is completed during the validation phase.
Data Source
AI summary
This application regards reference signal measurement including beam filtering by a wireless device. The wireless device calculates a RSRP value in response to receipt a message, such as an RRC release message, a MAC CE TAC message, or an RAR message. The wireless device measures and stores the RSRP value to use for subsequent validation of a timing advance (TA) value before small data transmission. The wireless device obtains multiple measurements of a reference signal included in a signal synchronization block (SSB) using beam sweeping and filters the measured sample values using combinations of the multiple measurements to determine the RSRP value. In some cases, a receive beam having a strongest RSRP value is selected, and further measurements are taken using the same receive beam. In some cases, multiple measurements for each receive beam are combined using filtering and then a strongest, filtered RSRP value is selected.