Uplink Transmission Using Long CP for New TCI State Alignment
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Solution Overview
Problem
In multi-TRP operation, the initialization or activation of an additional TA loop for a new TCI state during uplink transmission results in timing misalignment, leading to potential degradation or loss of uplink data due to insufficient cyclic prefix duration.
Innovation Solution
Implementing a long cyclic prefix for uplink signal transmission when activating or switching to a new TCI state to accommodate the additional delay, ensuring proper timing alignment and reducing the likelihood of data loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a normal cyclic prefix is used for uplink transmission during multi-TRP operation, then the transmission speed is maintained, but timing misalignment occurs when activating a new TCI state leading to data loss
Solution Approach 1:
The patent changes the cyclic prefix parameter from normal to extended when a new TCI state is activated. This parameter change provides additional time buffer to accommodate timing misalignment during TA loop initialization, ensuring reliable uplink transmission without data loss while maintaining normal transmission speed for常规 operations.
2Reliability
If an extended cyclic prefix is used for uplink transmission, then timing alignment is improved for new TCI states, but transmission efficiency decreases
Solution Approach 1:
The patent dynamically adjusts the cyclic prefix length based on the TCI state activation status. Normal cyclic prefix is used during stable transmission to maintain efficiency, while extended cyclic prefix is activated only when a new TCI state is detected, providing timing alignment protection only when needed. This dynamic adaptation resolves the contradiction between reliability and productivity.
Solution Approach 2:
The system changes the cyclic prefix parameter dynamically based on operational conditions. By monitoring TCI state changes and adjusting the cyclic prefix length accordingly, the system achieves optimal balance between timing alignment accuracy and transmission efficiency, using extended prefix only when timing misalignment risk exists.
3Adaptability or versatility
If additional TA loop initialization is performed for multi-TRP operation, then multi-TRP performance is enhanced, but timing misalignment and data loss risk increase
Solution Approach 1:
The patent applies beforehand cushioning by using extended cyclic prefix during TA loop initialization for new TCI states. This extended prefix acts as a protective buffer that accommodates potential timing misalignment before the TA loop is fully established, preventing data loss and ensuring reliable transmission during the vulnerable initialization period of multi-TRP operation.
Data Source
AI summary
Embodiments of the present disclosure disclose devices, methods and apparatuses for uplink transmission using long CP. A terminal device receives, from a network device, a new transmission configuration indicator, TCI, state indication. The new TCI state indication indicates a new TCI state is to be used for uplink signal transmission. Then, the terminal device transmits, to the network device, at least one uplink signal using a long cyclic prefix, CP, in at least one uplink channel associated with the new TCI state.