FDD-TDD Cell Coordination for Wireless Device Duplex Collision
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Solution Overview
Problem
In wireless communication systems, particularly in LTE and LTE-Advanced, the operation of wireless devices configured with multiple serving cells using different duplex schemes, such as TDD and FDD, faces challenges in managing uplink and downlink communications due to collisions between duplex operations, leading to ambiguity and potential errors in data transmission and reception.
Innovation Solution
A wireless device and communication method that configures both frequency division duplex (FDD) and time division duplex (TDD) cells, determining the uplink-downlink direction of the FDD cell based on the configuration of the TDD cell, to avoid collisions and maintain clear communication operations between cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple serving cells with different duplex schemes (TDD and FDD) are configured for a wireless device, then the peak throughput is increased, but the operation clarity between cells deteriorates due to collisions between duplex operations
Solution Approach 1:
The patent segments the handling of different duplex schemes by introducing a reference cell concept. The first cell (reference cell) operates independently while the second cell's operations are segmented and coordinated based on the reference cell's TDD configuration, resolving the collision issue between TDD and FDD operations.
Solution Approach 2:
Instead of allowing each cell to operate independently with its own duplex scheme, the patent inverts the approach by making the FDD cell's operations dependent on the TDD cell's configuration. The FDD cell's uplink-downlink directions are determined according to the TDD cell's UL-DL configuration, preventing collisions.
2Adaptability or versatility
If multiple serving cells with different duplex schemes are configured, then the network environment adaptability is improved, but the ambiguity in communication operations increases
Solution Approach 1:
The patent creates a universal reference cell configuration that can be applied across different network environments. The reference cell's TDD configuration serves as a universal template that determines the operations of other cells, eliminating ambiguity while maintaining adaptability to various network conditions.
Solution Approach 2:
The reference cell acts as an intermediary between the network configuration and the actual cell operations. By using the reference cell's TDD configuration as a mediator to determine FDD cell operations, the patent eliminates direct conflicts between different duplex schemes and reduces operational ambiguity.
3Productivity
If FDD and TDD cells are configured simultaneously, then the data transmission capacity is increased, but the potential errors in data transmission and reception increase due to duplex operation collisions
Solution Approach 1:
The patent applies preliminary action by pre-configuring the reference cell's TDD parameters before establishing operations in other cells. The FDD cell's uplink-downlink directions are predetermined based on the reference cell's configuration, preventing collisions before they occur and ensuring accurate data transmission.
Solution Approach 2:
The patent implements preliminary anti-action by using the reference cell's TDD configuration to preemptively prevent conflicts in the FDD cell's operations. By determining the FDD cell's directions in advance based on the reference cell, the system prevents duplex operation collisions that would otherwise cause transmission errors.
Data Source
AI summary
Provided is a communication method by a wireless device for which a plurality of serving cells is configured in a wireless communication system. The wireless device configures a frequency division duplex (FDD) cell and a time division duplex (TDD) cell and determines an uplink (UL)-downlink (DL) direction of the FDD cell according to a UL-DL configuration of the TDD cell.