TPC Command Timing for TDD-FDD Carrier Aggregation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems supporting Time Division Duplex (TDD)-Frequency Division Duplex (FDD) Carrier Aggregation, existing timing of Transmit Power Control (TPC) commands can lead to erroneous uplink power control when cross-carrier scheduling is configured, particularly for User Equipment (UE) connected with both TDD and FDD carriers, resulting in unnecessary operations and inefficient power control.
Innovation Solution
A method and apparatus for controlling the timing of TPC commands, specifically optimizing the Physical Uplink Shared Channel (PUSCH) transmission power control by establishing a Radio Resource Control (RRC) connection with a base station, receiving TPC commands through a TDD serving cell, and transmitting PUSCH through an FDD serving cell, using a new timing scheme that aligns with the TDD-FDD Carrier Aggregation configuration to avoid erroneous power control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing TPC command timing is applied to TDD-FDD CA with cross-carrier scheduling, then general compatibility is maintained, but erroneous uplink power control occurs and unnecessary operations are performed
Solution Approach 1:
The patent applies different TPC command timing rules for different carrier aggregation scenarios. For TDD-FDD CA with cross-carrier scheduling, a specific timing relationship is defined where the TPC command received in subframe n-4 applies to PUSCH transmission in subframe n, distinguishing it from other CA configurations to ensure accurate power control for this specific case
2Ease of operation
If existing TPC command timing is applied to TDD-FDD CA with cross-carrier scheduling, then general scheduling is maintained, but unnecessary operations increase battery consumption
Solution Approach 1:
The patent changes the timing parameter K for TPC command application. For TDD-FDD CA with cross-carrier scheduling, it defines that a TPC command received in subframe n-4 applies to PUSCH transmission in subframe n, optimizing the timing parameter to eliminate unnecessary power control operations and reduce battery consumption
3Device complexity
If existing TPC command timing is applied to TDD-FDD CA with cross-carrier scheduling, then conventional timing rules are followed, but transmission efficiency decreases due to erroneous power control
Solution Approach 1:
The patent defines specific TPC command timing behavior for TDD-FDD CA with cross-carrier scheduling, where the timing relationship between TPC command reception and PUSCH transmission is explicitly defined to ensure accurate power control and improve transmission efficiency for this specific scenario
Data Source
AI summary
One or more exemplary embodiments provide a TPC command timing by taking into consideration TDD-FDD CA and cross-carrier scheduling, and provide a PUSCH transmission power controlling method in a subframe i for an FDD-based scheduled cell, based on the TPC command timing. According to one or more exemplary embodiments, an uplink transmission power may be effectively controlled when TDD-FDD CA and cross-carrier scheduling is configured for a UE. A Physical Uplink Shared Channel (PUSCH) transmission power control timing may be optimized.