Unconnected Base Station TDD Schedule Orthogonalization
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Solution Overview
Problem
Time division duplex (TDD) communication systems with unconnected base stations face self-interference issues due to overlapping transmission and reception frequencies, which desensitize receivers and interfere with signal reception.
Innovation Solution
The unconnected base station selects a transmission schedule that is orthogonal to the connected base station's schedule, ensuring it only transmits when the connected base station is receiving and receives when it is transmitting, thereby avoiding frequency overlap and minimizing self-interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the unconnected base station uses the same frequency band for both transmission and reception, then spectral efficiency is improved, but self-interference occurs
Solution Approach 1:
The patent applies periodic action by implementing time-division duplexing with periodic transmission and reception slots. The unconnected base station alternates between transmitting downlink signals and receiving uplink signals in periodic cycles, preventing self-interference while maintaining frequency reuse. The base station receives a TDD configuration indicating periodic transmit/receive slots and synchronizes accordingly.
Solution Approach 2:
The patent segments the communication timeline into distinct transmission and reception periods. By dividing the TDD frame into separate slots for downlink transmission and uplink reception, the system allows the unconnected base station to perform both functions in the same frequency band without simultaneous self-interference.
2Productivity
If the unconnected base station transmits downlink signals while receiving uplink signals in the same time slot, then time efficiency is improved, but self-interference occurs
Solution Approach 1:
The system uses periodic action by implementing alternating transmit and receive slots in a TDD configuration. The unconnected base station transmits downlink signals in designated transmit slots and receives uplink signals in designated receive slots, preventing simultaneous transmission and reception that would cause self-interference.
3Adaptability or versatility
If the unconnected base station operates independently without synchronizing with the connected base station, then operational flexibility is improved, but coordination issues arise
Solution Approach 1:
The patent implements feedback mechanisms where the unconnected base station receives TDD configuration information from the connected base station and adjusts its transmission schedule accordingly. This feedback ensures proper coordination between the two base stations while maintaining the operational flexibility of the unconnected base station to serve its own UEs.
Solution Approach 2:
The unconnected base station performs preliminary action by receiving and processing the TDD configuration from the connected base station before initiating its transmission schedule. This preliminary synchronization ensures that the unconnected base station's transmit and receive slots are properly coordinated with the connected base station's schedule.
Data Source
AI summary
In a time division duplex (TDD) communication system, an unconnected base station that is not directly connected to a core network transmits uplink backhaul signals to a connected base station when the unconnected base station is transmitting downlink signals to one or more user equipment (UE) devices and receives downlink backhaul signals from the connected base station when receiving uplink signals from one or more UE devices. After determining the transmission schedule of the connected base station, the unconnected base station selects a transmission schedule that is orthogonal to the connected base station transmission schedule. Depending on the particular implementation, the unconnected base station may be a repeater base station, a relay base station, or a self-backhauled base station.