Timing Advance Group Adjustment for Uplink Power Limit Compliance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In multicarrier or carrier aggregation technologies, terminals face challenges in managing uplink transmit power when using multiple carriers, leading to excessive power usage due to overlapping transmit timing values, especially when the time span of the overlapped area is long, resulting in a high probability of exceeding the maximum uplink transmit power limit.
Innovation Solution
A timing value adjustment method that involves obtaining absolute timing differences between timing advance groups (TAGs) and sending signaling to a network device to adjust transmit timing values based on predetermined conditions, including thresholds and reference values, to prevent power exceeding limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If different transmit timing values are used for carriers of different frequencies to ensure simultaneous data arrival at the base station, then data transmission reliability is improved, but the sum of transmit power of multiple carriers in the overlapped area may exceed the maximum uplink transmit power limit
Solution Approach 1:
The terminal performs preliminary calculation of the overlapped area time span between multiple carriers before actual transmission. Based on this pre-calculated information, the terminal can proactively adjust power allocation or rollback timing values to prevent power limit exceedance, rather than reacting after the problem occurs.
Solution Approach 2:
The terminal dynamically adjusts transmit timing values and power allocation based on the calculated overlapped area characteristics. When the overlapped time span is detected to be relatively long, the system adaptively modifies transmission parameters to maintain power within limits while ensuring reliable data arrival.
2Power
If power allocation or rollback operation is used to resolve power exceedance in short overlapped areas, then power limit compliance is improved for short durations, but the problem cannot be resolved when the time span of the overlapped area is relatively long
Solution Approach 1:
The terminal changes the parameter being controlled from单纯的power allocation to include timing value adjustments. By modifying transmit timing values in addition to power allocation, the system can handle both short and long overlapped areas effectively, as timing adjustment provides an additional degree of freedom to resolve power exceedance regardless of overlapped duration.
3Productivity
If multiple carriers are used to send data in the same subframe to increase transmission capacity, then data transmission efficiency is improved, but the probability of exceeding maximum uplink transmit power limit increases
Solution Approach 1:
The terminal implements a feedback mechanism where it continuously monitors the overlapped area time span between multiple carriers and adjusts power allocation and timing values accordingly. This closed-loop control ensures that while multiple carriers are utilized for high efficiency, the power limit is never exceeded by dynamically responding to the actual overlapped area conditions.
Data Source
AI summary
Embodiments of the present invention disclose a timing value adjustment method and apparatus, which relate to the communications field and reduce a probability that power of a terminal exceeds a limit. A specific solution is that: an absolute timing difference of a timing advance group TAG pair is obtained according to an absolute value of a difference between transmit timing values or receive timing values of the two TAGs in the TAG pair, where the TAG pair is formed by any two TAGs in a TAG set; and it is determined that the absolute timing difference of the TAG pair meets a predetermined condition, and first signaling is sent to a network device, where the first signaling includes identifiers of the two TAGs in the TAG pair. The present invention is used in a timing value adjustment process.