Downlink Control Channel Timing for Enhanced Uplink
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Solution Overview
Problem
Current wireless communication systems face challenges in minimizing the round trip processing time for packet data transmission on uplink channels and acknowledgement by the base station, which affects the efficiency of high-speed data services.
Innovation Solution
The solution involves a remote station and a base station apparatus that transmit and receive frames with specific time offsets relative to a common control physical channel, allowing for efficient generation and processing of downlink dedicated physical and control channels, thereby optimizing the timing for packet data transmission and acknowledgement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station transmits acknowledgement frames after receiving uplink packet data, then the system can provide feedback for reliable data transmission, but the round trip processing time increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring the base station with timing information and processing parameters before actual data transmission occurs. The base station is configured to transmit downlink acknowledgement frames at predetermined time offsets relative to received uplink frames, allowing the system to prepare timing schedules in advance and reduce real-time processing delays.
Solution Approach 2:
The patent utilizes parameter changes by dynamically adjusting time offset parameters between uplink and downlink frames based on propagation delay measurements and processing requirements. The system modifies timing parameters such as TTI (Transmission Time Interval) and frame transmission timing to optimize the balance between feedback reliability and round trip time.
2Device complexity
If the system uses standard frame timing for downlink channels, then the timing structure remains simple, but the timing alignment for high-speed uplink data transmission is not optimized
Solution Approach 1:
The patent applies dynamics by making the downlink frame timing adjustable and adaptive rather than fixed. The base station dynamically determines transmission timing for downlink acknowledgement frames based on the actual timing of received uplink data frames and measured propagation delays, allowing the system to optimize timing alignment for high-speed transmission while maintaining manageable structural complexity.
Solution Approach 2:
The system performs preliminary timing calculations and configurations before actual data transmission. The base station pre-determines optimal time offsets and transmission schedules based on configured parameters and propagation delay information, enabling efficient high-speed uplink transmission without requiring complex real-time timing adjustments.
3Loss of time
If the base station processes and transmits acknowledgement frames immediately, then the round trip time is minimized, but the processing load on the base station increases
Solution Approach 1:
The base station performs preliminary processing of timing information and acknowledgement frame preparation before actual transmission occurs. By pre-configuring timing parameters and processing schedules based on received uplink frame timing and propagation delay measurements, the base station reduces the processing load during critical transmission periods while maintaining minimized round trip time.
Solution Approach 2:
The patent ensures continuous and efficient processing by maintaining a continuous flow of timing information and acknowledgement frame generation. The base station continuously monitors uplink frame timing, calculates appropriate time offsets, and prepares downlink frames in a continuous manner, distributing the processing load over time rather than concentrating it, thereby reducing instantaneous processing demand while maintaining fast response.
Data Source
AI summary
A remote station for wireless communication is disclosed. The remote station includes a transmitter configured to transmit packet data on an uplink channel and a receiver. The receiver is configured to receive a first frame having a downlink dedicated physical channel, the first frame being defined by a first propagation delay and a first time offset relative to a reference timing based on a common control physical channel and receive a second frame having a downlink dedicated control channel responsive to the packet data received by a base station, a beginning of the second frame being defined by a second propagation delay and a second time offset from the reference timing, the second time offset being a function of the first time offset.