TDD Pattern Indication for Early LTM RACH Occasion Selection
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Solution Overview
Problem
In wireless communication systems, identifying valid random access channel (RACH) occasions (ROs) in a candidate cell for Layer 1 or Layer 2 triggered mobility (LTM) requires parsing a full RRC configuration message or decoding system information, which negates the purpose of early uplink synchronization configuration.
Innovation Solution
Indicate the TDD pattern associated with the LTM candidate cell separately from the full RRC configuration message, allowing the user equipment (UE) to identify valid ROs without parsing the RRC message or decoding system information, thereby reducing processing burden and resource consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE parses the full RRC configuration message or decodes system information to identify valid RACH occasions, then the identification is accurate and complete, but the processing burden and resource consumption increase significantly
Solution Approach 1:
The patent extracts the essential TDD pattern information from the full RRC configuration message and transmits it separately as a standalone indication. This allows the UE to identify valid RACH occasions using only the extracted TDD pattern without needing to parse the entire RRC message or decode system information, thereby reducing processing resources while maintaining identification accuracy.
Solution Approach 2:
The TDD pattern indication is provided in advance as part of the LTM configuration, before the UE needs to identify valid RACH occasions. This preliminary provision of critical timing information enables the UE to perform early uplink synchronization efficiently without subsequent heavy processing of full configuration messages.
2Loss of information
If the UE parses the full RRC configuration message to identify valid RACH occasions, then all configuration details are available, but the processing time and complexity increase
Solution Approach 1:
The critical TDD pattern information is extracted and transmitted separately from the full RRC configuration message. This extraction approach provides the UE with sufficient information to identify valid RACH occasions without requiring complex parsing of the complete configuration message, reducing processing complexity while maintaining necessary configuration completeness.
Solution Approach 2:
Instead of providing the entire RRC configuration message, the patent provides just the necessary TDD pattern indication - a partial action that is sufficient for the UE to identify valid RACH occasions. This avoids the excessive processing complexity of handling full configuration messages while ensuring all necessary information is available.
3Stability of the object's composition
If the TDD pattern is included in the full RRC configuration message, then all configuration information is unified, but the UE cannot perform early uplink synchronization efficiently
Solution Approach 1:
The configuration information is segmented into two parts: the full RRC configuration message and a separate TDD pattern indication. This segmentation allows the UE to access the critical TDD pattern information independently for early uplink synchronization, improving productivity, while the full message remains available for complete configuration details, maintaining configuration unity.
Solution Approach 2:
The TDD pattern indication is provided preliminarily and separately, enabling the UE to perform early uplink synchronization before receiving or processing the full RRC configuration message. This preliminary provision of timing-critical information enhances synchronization efficiency while the unified configuration is subsequently provided through the complete message.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a Layer 1 or Layer 2 (L1/L2) triggered mobility (LTM) configuration that indicates a time division duplexing (TDD) pattern associated with an LTM candidate cell. The UE may identify, in accordance with an early uplink synchronization with the LTM candidate cell, one or more valid random access channel (RACH) occasions (ROs) in the LTM candidate cell in accordance with the TDD pattern associated with the LTM candidate cell. Numerous other aspects are described.