Wireless Relay Segment Allocation for Throughput Asymmetry
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Solution Overview
Problem
Existing wireless relay systems using orthogonal frequency division multiplexing (OFDM) face challenges in efficiently managing channel bandwidth and throughput asymmetry, particularly when emphasizing upstream or downstream throughput, and waste segment utilization during two-stage relay operations.
Innovation Solution
A wireless communication system that divides a frequency channel into three segments, with a segment control unit managing the use of segments in each relay section to prioritize throughput in either direction by dynamically allocating two or one segments for uplink and downlink sections based on communication quality, allowing for asymmetric configurations and increased output intensity when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the same DL:UL ratio is used in each relay section to avoid interference, then interference is avoided, but it becomes difficult to emphasize upstream or downstream throughput
Solution Approach 1:
The frequency channel is divided into multiple segments (seg0, seg1, seg2), and different segments are allocated to different relay sections. This allows each relay section to use different DL:UL ratios independently, enabling throughput asymmetry configuration while avoiding interference between sections through frequency separation.
Solution Approach 2:
Different relay sections are assigned different quality characteristics through segment allocation. Each relay section can have customized DL:UL ratios according to its specific throughput requirements, allowing local optimization of throughput asymmetry while maintaining overall system interference avoidance.
2Productivity
If three-stage relay is configured to perform maximum relay, then relay coverage is maximized, but two segments are used and one segment is wasted during two-stage relay operations
Solution Approach 1:
The segment allocation is made dynamic rather than fixed. The system can adaptively allocate segments based on the actual relay stage being performed, allowing two-stage relay to efficiently use only two segments while three-stage relay utilizes all three segments, thereby improving segment utilization efficiency without sacrificing relay coverage capability.
Solution Approach 2:
The system changes the operational parameters (segment allocation) based on the relay stage configuration. When operating in two-stage relay mode, the parameter configuration changes to utilize only two segments, avoiding the waste of the third segment while maintaining full relay coverage capability when needed.
3Productivity
If one segment is used in the emphasized direction, then segment utilization is optimized, but output intensity must be increased to maintain throughput
Solution Approach 1:
Instead of using all three segments in the emphasized direction, the system uses only one or two segments partially, which optimizes segment utilization efficiency. The power output is adjusted accordingly to maintain the required throughput, achieving a balance between efficient resource utilization and acceptable power consumption.
Data Source
AI summary
Provided is a technique for efficiently using a channel bandwidth in a wireless communication system provided with a function for dividing a frequency channel into a plurality of segments and performing relay using the segments that differ from relay section to relay section. In a second scheme, an upstream direction of a first relay section is a DL section, and two segments are used. An upstream direction of a second relay section is a UL section, and two segments are used. That is, 2/3 of an area is used in a frequency-axis direction, and 1/2 of the area is used in a time-axis direction similarly to a first scheme. A data area ratio for the second scheme becomes 1/3. A data area ratio for the first scheme is 1/6. Thus, a throughput for the second scheme is twice a throughput for the first scheme.