Intra-cell Carrier Aggregation Control Channel Timing Synchronization
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Solution Overview
Problem
In mobile communication systems, particularly in LTE-A, there is a need for efficient transmission of control channels across cells operating in different duplexing modes, such as FDD and TDD, to manage uplink and downlink data effectively, especially when cells switch between duplexing modes due to limited frequency bands or other reasons.
Innovation Solution
A method and apparatus for transmitting control channels in an intra-frequency carrier aggregation system, where control channels are synchronized using the uplink control channel transmission timing of one duplexing mode to match or mismatch the uplink subframes of another, allowing for flexible scheduling and transmission of uplink data and downlink control channels across cells operating in different duplexing modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If control channels are transmitted using separate timing for each duplexing mode, then transmission accuracy is maintained, but system complexity increases
Solution Approach 1:
The patent merges the timing mechanisms for FDD and TDD control channels by having the TDD eNB adopt the FDD uplink control channel transmission timing. This unification reduces the number of separate timing schedules that must be managed, thereby reducing system complexity while maintaining accurate control channel transmission through the unified timing reference.
2Adaptability or versatility
If multiple cells operate in different duplexing modes simultaneously, then system adaptability improves, but coordination difficulty increases
Solution Approach 1:
The patent implements universality by enabling the TDD cell to use the FDD timing structure for control channel transmissions. This allows the system to maintain a common timing framework that works across different duplexing modes, reducing coordination complexity while preserving the ability to support multiple duplexing modes simultaneously through the primary cell's mode selection.
Data Source
AI summary
A method for receiving control channel and an apparatus in a wireless communication system are provided. The method includes transmitting, at a base station, information on a primary cell operating in a frequency division duplexing (FDD) mode and a secondary cell operating in a time division duplexing (TDD) mode, transmitting, at the base station, downlink scheduling information for downlink data, transmitting, at the base station, the downlink data in a first subframe according to the downlink scheduling information, and receiving, at the base station, control information corresponding to the downlink data on the primary cell, from a terminal. The control information is transmitted using a physical uplink control channel (PUCCH) format determined based on a type of the first subframe of the secondary cell.