User Equipment Cyclic Prefix Extension Determination
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Solution Overview
Problem
During the initial access phase in mobile communication, user equipment (UE) faces challenges in determining the cyclic prefix extension (CPE) since it has not been configured by radio resource control (RRC) signaling, making it difficult for the UE to determine CPE values based on parameters like C2 or C3 when indicated by the base station.
Innovation Solution
The UE receives downlink control information (DCI) that indicates CPE values, and if these values are not configured through UE-specific RRC signaling, it determines them using specific rules, such as calculating based on timing advance (TA), symbol length, and Listen-Before-Talk (LBT) gaps, or using predefined integer values, to determine the CPE values independently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE uses RRC configured values for CPE determination, then the CPE can be accurately determined during normal operation, but the UE cannot determine CPE during initial access phase when RRC configuration is not available
Solution Approach 1:
The patent applies preliminary action by pre-defining default values for C2 and C3 parameters that the UE can use during initial access phase before RRC configuration is completed. The UE is configured with these default values in advance, allowing it to determine CPE immediately when needed during initial access, without waiting for RRC configuration to finish.
Solution Approach 2:
The patent implements parameter changes by enabling the UE to switch between different parameter determination modes: using RRC configured values when available during normal operation, and using default values when not available during initial access. This dynamic parameter switching resolves the contradiction by adapting the determination method based on the operational phase.
2Measurement precision
If the UE waits for RRC configuration to determine CPE, then accurate CPE values can be obtained, but initial access process is delayed
Solution Approach 1:
The patent applies preliminary action by pre-configuring default values for C2 and C3 in the UE before RRC configuration is completed. This allows the UE to immediately determine CPE using these pre-available default values during initial access, eliminating the delay that would occur if the UE had to wait for RRC configuration to finish.
Solution Approach 2:
The patent uses default values as intermediary parameters that bridge the gap between the UE's initial state and the fully configured state. These default values act as temporary substitutes that enable CPE determination during initial access, and are later replaced by accurate RRC configured values when available.
3Ease of operation
If the UE uses default values for C2 and C3, then CPE can be determined during initial access, but the values may not be optimized for specific UE configurations
Solution Approach 1:
The patent implements dynamics by creating a dynamic parameter selection mechanism that adapts to the operational phase. During initial access, the system dynamically uses default values to enable immediate operation. After RRC configuration is completed, the system dynamically switches to using configured values for optimized performance. This dynamic approach resolves the contradiction between ease of initial access and precision of CPE values.
Solution Approach 2:
The patent applies parameter changes by enabling the UE to change the source of C2 and C3 values based on operational requirements. The UE transitions from using fixed default values during initial access to using adaptive configured values during normal operation, optimizing the parameters for each phase's specific requirements.
Data Source
AI summary
Embodiments of the disclosure provide a method and apparatus for determining a cyclic prefix extension (CPE) and a user equipment (UE). The method includes that, the UE receives first downlink control information (DCI), where the first DCI carries first indication information, the first indication information indicates the CPE, the CPE is determined based on at least one of a first value or a second value, and the first value is different from the second value; in response to the at least one of the first value or the second value not being configured through UE-specific radio resource control (RRC) signaling, the UE determines the first value according to a first rule, and/or determines the second value according to a second rule, and determines a value of the CPE based on the at least one of the first value or the second value.