PRACH Preamble Segmentation for UE Duplex Mode Detection
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Solution Overview
Problem
Current cellular mobile communication systems lack a method to determine the duplex mode of a User Equipment (UE) at the network side, which is essential for efficient communication in systems supporting both Frequency Division Duplex (FDD) and Time Division Duplex (TDD modes.
Innovation Solution
A method and device that configure mutually orthogonal PRACH channel resources and preambles for UE in different duplex modes, allowing the base station to detect and determine the duplex mode by signaling configuration information and analyzing random access signals, enabling hybrid access for FDD and TDD UEs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the network supports both FDD and TDD modes concurrently, then the system's adaptability and service capability are improved, but the complexity of determining UE duplex mode increases and no existing method can accurately identify the UE's duplex mode
Solution Approach 1:
The patent uses different preamble sequences as distinct identifiers (analogous to color changes) to represent different duplex modes. FDD UEs use preambles from one set while TDD UEs use preambles from another set, allowing the base station to identify the UE's duplex mode by detecting which preamble set the UE selected, similar to how different colors can indicate different categories or states.
Solution Approach 2:
The patent introduces an intermediary mechanism (specific preamble sequence selection) that bridges the gap between UE duplex mode operation and base station mode identification. The preamble acts as a mediator that carries implicit information about the UE's duplex mode without requiring direct signaling, allowing the base station to infer the mode through detection rather than explicit reporting.
2Measurement precision
If orthogonal PRACH resources are allocated for different duplex modes, then the precision of duplex mode detection is improved, but the complexity of resource configuration increases
Solution Approach 1:
The patent segments the PRACH preamble space into distinct sets for different duplex modes. By dividing the available preambles into separate groups (one set for FDD, another set for TDD), the system enables precise identification of the UE's duplex mode through simple detection of which segment the UE selected, while the segmentation itself is configured once and reused for all UEs in that mode.
Solution Approach 2:
The patent makes the PRACH preamble mechanism universal by using it for both random access and duplex mode identification simultaneously. The same preamble selection process serves dual purposes: establishing uplink synchronization and revealing the UE's duplex mode, thereby avoiding the need for separate dedicated signaling resources while maintaining detection precision.
3Adaptability or versatility
If system broadcast signals configuration information for multiple duplex modes, then the accessibility for both FDD and TDD UEs is improved, but the information overhead increases
Solution Approach 1:
The patent merges the random access procedure with the duplex mode indication function. By combining these two functions into a single process, the system eliminates the need for separate dedicated signaling for mode indication, thereby reducing information overhead while maintaining full hybrid access capability. The same physical channel (PRACH) carries both access request and mode identification information.
Solution Approach 2:
The system broadcast information is designed to be universal, providing configuration parameters that work for both FDD and TDD UEs simultaneously. The base station broadcasts unified PRACH configuration including both sets of preambles, allowing any UE regardless of duplex mode to access the network using the appropriate preamble set without requiring mode-specific broadcast messages.
Data Source
AI summary
A method and device for acquiring user equipment duplex mode information are disclosed by the present invention, wherein, the method includes: the user equipment establishes a radio resource control connection with a base station, and reports the user equipment duplex mode information when establishing the radio resource control connection. With the technical scheme provided in the embodiments of the present invention, the network side acquires the duplex mode of the user equipment.