Wireless Relay Grouping for Traffic Fluctuation Control
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Solution Overview
Problem
Existing wireless relay systems face decreased system throughput due to increased packet collisions when traffic increases, and are inflexible in handling short-term traffic fluctuations, particularly in systems using random access and time-division multiple access schemes.
Innovation Solution
A wireless relay system where relay stations are divided into groups, with transmission rights allocated for specific time slots, allowing only permitted groups to perform random access, thereby reducing packet collisions and improving throughput by synchronizing slot timing and allocating transmission rights based on traffic demands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If relay stations perform autonomous distributed random access control with carrier detection, then ease of operation is improved, but system throughput deteriorates due to packet collisions when traffic increases
Solution Approach 1:
The system segments relay stations into different groups (first group and second group) and allocates specific time slots to each group. This segmentation prevents packet collisions by ensuring that relay stations in the same group do not transmit simultaneously, while maintaining the simplicity of random access control for terminal stations.
Solution Approach 2:
The system implements periodic time slot allocation where transmission rights are alternately assigned to different relay station groups. This periodic structure allows the system to handle traffic fluctuations while preventing collisions through structured time division, improving throughput without sacrificing operational simplicity.
2Adaptability or versatility
If transmission stations use random waiting time based on random numbers, then adaptability to traffic fluctuations is improved, but packet collision probability increases when multiple stations transmit simultaneously
Solution Approach 1:
By segmenting relay stations into groups with dedicated time slots, the system reduces the number of stations contending for the same transmission opportunity. This segmentation maintains adaptability to traffic patterns while significantly reducing collision probability through structured access control.
Solution Approach 2:
The base station acts as an intermediary that allocates time slots to relay station groups based on traffic conditions. This intermediary control mechanism coordinates transmissions to minimize collisions while adapting to varying traffic demands, resolving the conflict between adaptability and collision avoidance.
3Reliability
If time slots are allocated to relay station groups, then packet collision probability is reduced, but device complexity increases due to slot synchronization and time allocation management
Solution Approach 1:
The base station performs multiple functions including traffic monitoring, time slot allocation, and synchronization management. This universal control approach consolidates complexity in a single entity while keeping relay station operations simple, reducing overall system complexity despite the added coordination requirements.
Solution Approach 2:
The periodic time slot allocation follows a regular pattern where transmission rights are systematically assigned to different relay station groups. This periodic structure simplifies synchronization management by providing predictable transmission opportunities, reducing the complexity of coordinating multiple relay stations.
4Device complexity
If conventional wireless relay schemes are used without network encoding, then device complexity is reduced, but system throughput is limited and cannot be improved through advanced encoding techniques
Solution Approach 1:
The system segments the communication process into distinct time slots for different relay station groups, creating a structured framework that enables optional network encoding. This segmentation provides the organizational structure needed to implement advanced encoding techniques without increasing overall system complexity.
Solution Approach 2:
The system dynamically allocates time slots to relay station groups based on traffic conditions, creating a flexible framework that can adapt to different encoding schemes. This dynamic approach allows the system to incorporate network encoding when beneficial while maintaining operational simplicity when not required.
Data Source
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AI summary
Provided is a wireless relay system that improves system throughput between terminal stations and flexibly makes system throughput variable with respect to short-term traffic fluctuations. In the wireless relay system, a plurality of relay stations relay communication between two terminal stations that perform random access. The terminal stations and the relay stations include a slot synchronization unit, a time synchronization unit, and a transmission unit. The slot synchronization unit synchronizes slot timing of a time slot indicating a unit time. The time synchronization unit performs time synchronization for synchronization of the slot timing. The transmission unit transmits a transmission packet to a wireless line in synchronization with the slot timing. A transmission right is allocated for at least one time slot to each of a plurality of groups which are configured so that a group of a terminal station or a relay station and a group of an adjacent terminal station or an adjacent relay station are different from each other. The transmission unit transmits the transmission packet to the wireless line only in a time slot in which the transmission right is allocated to the group to which the terminal station or the relay station belongs.