RFFE Guard-Symbol Control for Stable TDD Carrier Aggregation
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Solution Overview
Problem
Existing user equipment experiences throughput degradation and transmission efficiency issues during Inter-band Carrier Aggregation (ICA) due to varying phase/gain on downlink and uplink transmissions in Time Division Duplexing (TDD) mode.
Innovation Solution
Implementing Time Division Duplexing (TDD) transmission control and gain/phase compensation in user equipment to stabilize phase/gain on downlink and uplink transmissions, preventing throughput degradation by maintaining consistent states during guard symbols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If Inter-band Carrier Aggregation (ICA) is executed to aggregate multiple carriers from different frequency bands, then data transmission rates and bandwidth are increased, but throughput degradation occurs and transmission efficiency is affected due to varying phase/gain on downlink and uplink transmissions
Solution Approach 1:
The patent applies preliminary action by configuring the first TDD transmission path to be in a specific state (either TDD transmitting state or TDD receiving state) during the guard symbol period before actual data transmission begins. This advance configuration prevents phase/gain variations that would otherwise occur during transmission state transitions, thereby maintaining transmission efficiency while enabling ICA for high data rates
Solution Approach 2:
The patent changes the operational parameter of the first TDD transmission path by controlling it to maintain a consistent state (transmitting or receiving) during the guard symbol period, rather than allowing it to switch states. This parameter stabilization prevents the phase/gain variations that cause throughput degradation, while still permitting the use of multiple frequency bands for aggregated data transmission
2Adaptability or versatility
If TDD transmission state transitions are allowed during normal operation, then communication flexibility is maintained, but phase/gain variations occur causing throughput degradation
Solution Approach 1:
The patent applies local quality by making a specific exception for the guard symbol period in the TDD transmission schedule. During this localized time window, the first TDD transmission path is constrained to maintain a fixed state rather than allowing normal state transitions. This localized control prevents phase/gain variations only when necessary, while preserving overall communication flexibility for the rest of the transmission periods
Data Source
AI summary
A user equipment, a controlling method and a processing module thereof are provided. The user equipment comprises a radio frequency front-end (RFFE) module and a processing module. The radio frequency front-end module comprises a first transmission path and a second transmission path. The first transmission path is a Time Division Duplexing (TDD) path. The second transmission path is another TDD path or a Frequency Division Duplexing (FDD) path. The processing module is configured to control the RFFE module. A special slot for a TDD transmission on the first transmission path comprises at least one downlink symbol, at least one uplink symbol and at least one guard symbol. During the guard symbol, the first transmission path is controlled to be either a TDD receiving state for executing a TDD downlink transmission or a TDD transmitting state for executing a TDD uplink transmission.