Base Station Control Signal Mapping in Time-Division Relay
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In time-division relay systems, the difference in frame timing and propagation delay between base stations and relay stations results in varying reception ranges for OFDM symbols, necessitating distinct transmission formats for each relay station, which complicates control signal transmission.
Innovation Solution
A method where the base station maps the relay station control signal in a common OFDM symbol range that can be received by all relay stations, allowing for a unified transmission format, and adjusts the data signal mapping based on the calculated reception range of each relay station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If distinct transmission formats are used for each relay station to account for varying reception ranges, then reception quality is improved, but device complexity and control signal transmission complexity increase
Solution Approach 1:
The patent applies universality by designing a single common transmission format that can be used by all relay stations regardless of their individual reception ranges. The base station transmits control signals using this unified format, and each relay station selectively receives the portion of the control signal that falls within its reception range. This eliminates the need to create and manage multiple distinct transmission formats for different relay stations, thereby reducing system complexity while maintaining reliable reception.
Solution Approach 2:
The patent applies segmentation by dividing the common control signal transmission into multiple selectable portions, where each portion corresponds to the reception range of a specific relay station. The base station transmits the full control signal, and each relay station selects and processes only the segment relevant to its reception capabilities. This allows a single transmission format to serve multiple relay stations with different reception characteristics.
2Device complexity
If a common transmission format is used for all relay stations, then device complexity is reduced, but reception quality may deteriorate due to mismatched transmission formats
Solution Approach 1:
The patent applies dynamics by enabling relay stations to dynamically select which portion of the common control signal to receive based on their individual reception ranges. While the transmission format itself remains static and common to all relay stations, the reception behavior is dynamic - each relay station adapts by selecting the appropriate segment of the transmitted signal that matches its reception capabilities. This dynamic selection ensures optimal reception quality without requiring dynamic changes to the transmission format.
Solution Approach 2:
The patent applies local quality by allowing each relay station to receive only the specific portion of the common control signal that is appropriate for its local reception characteristics. Instead of requiring a globally optimized transmission format for each relay station, the system transmits a common signal where different portions have different local qualities suitable for different relay stations' reception ranges.
3Reliability
If individual transmission formats are designed for each relay station, then reception quality is optimized, but the transmission process becomes more complex and time-consuming
Solution Approach 1:
The patent applies merging by combining multiple relay station control signals into a single common transmission format. Instead of separately transmitting customized control signals to each relay station, the base station merges all necessary control information into one common transmission that all relay stations can process. This significantly improves transmission efficiency by reducing the number of separate transmission operations required.
Solution Approach 2:
The patent applies universality by creating a multi-functional transmission format that serves all relay stations simultaneously. This single transmission format performs the function of controlling multiple relay stations with different reception ranges, eliminating the need for multiple specialized transmission formats and thereby improving transmission productivity.
4Ease of operation
If a unified transmission format is implemented, then ease of operation is improved, but adaptability to different relay station reception ranges decreases
Solution Approach 1:
The patent applies segmentation by dividing the common transmission format into multiple segments or portions, where each portion can be selectively received by relay stations with different reception ranges. This segmentation allows the unified transmission format to adapt to various relay station characteristics without requiring separate transmission formats, thereby maintaining both ease of operation and adaptability.
Solution Approach 2:
The patent applies parameter changes by allowing relay stations to adjust their reception parameters (such as timing and frequency offsets) based on their individual reception ranges while receiving the same common transmission format. This enables the system to maintain a simple unified transmission format while adapting to different relay station characteristics through parameter adjustments at the reception side.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A transmission method in time-division relay, using a common transmission format to transmit a control signal for each relay station apparatus; and a base station apparatus of the same. A base station apparatus maps the control signal for relay station apparatuses in the (D+1)th OFDM symbol inside a subframe, wherein D is the maximum number of OFDM symbols in which control signals for mobile station apparatuses are mapped, said control signals being transmitted from the base station apparatus to mobile station apparatuses under the control of the base station apparatus.