Dynamic MCS Level Adaptation in MMR Networks
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Solution Overview
Problem
The existing Multicast Broadcast Service (MBS) over Mobile WiMAX systems face challenges in providing stable and high-quality data throughput, especially for mobile stations located far from the base station, due to limitations in channel conditions and fixed Modulation and Coding Scheme (MCS) levels, which result in low data throughput and service quality deterioration.
Innovation Solution
A method and system for dynamically modifying the MCS level in Mobile Multi-hop Relay (MMR) networks by deciding the MCS level for transmission between the base station (BS) and relay station (RS), and then adjusting it for mobile stations (MS) based on the channel conditions, using test data and feedback to optimize spectrum efficiency and throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fixed MCS level is used for MBS transmission, then system simplicity is maintained, but data throughput and service quality deteriorate for mobile stations far from base station
Solution Approach 1:
The patent implements dynamic MCS level modification where the base station determines an initial MCS level for MBS transmission to relay stations, and relay stations dynamically adjust their own MCS levels based on their channel conditions and the base station's MCS level. This dynamic adaptation allows mobile stations at different distances from the base station to receive adequate service quality while maintaining system coordination.
Solution Approach 2:
The patent applies different MCS levels to different relay stations and mobile stations based on their local channel conditions. Each relay station receives an MCS level from the base station and then determines its own transmission MCS level to mobile stations, allowing local optimization of transmission quality according to specific channel conditions rather than using a uniform fixed MCS level system-wide.
2Productivity
If MCS level is increased to improve data throughput, then spectrum efficiency improves, but reliability of transmission deteriorates in poor channel conditions
Solution Approach 1:
The patent changes the MCS level parameter dynamically based on channel conditions. The base station determines an initial MCS level considering channel quality, and relay stations further adjust their transmission MCS levels based on their own channel conditions to mobile stations. This parameter adaptation ensures that higher MCS levels (for higher throughput) are only used when channel conditions permit, maintaining transmission reliability.
3Reliability
If relay station uses fixed MCS level for transmission to mobile station, then system complexity is reduced, but service quality for mobile users at cell edge deteriorates
Solution Approach 1:
The patent implements feedback mechanisms where mobile stations report channel quality information to relay stations, and relay stations report their received signal quality to the base station. This feedback enables relay stations to dynamically adjust their transmission MCS levels to mobile stations based on actual channel conditions, improving service quality for cell edge users while maintaining coordinated control through the base station.
4Productivity
If dynamic MCS level modification is implemented, then data throughput and service quality improve, but system complexity and overhead increase
Solution Approach 1:
The patent uses the base station as an intermediary that coordinates MCS level assignments. The base station determines initial MCS levels for relay stations based on overall system conditions and transmits these to relay stations, which then act as intermediaries to mobile stations. This hierarchical intermediary structure enables dynamic MCS adaptation without requiring direct complex coordination between all network elements, managing system complexity through structured intermediation.
Data Source
AI summary
A method and system for Multicast Broadcast Service (MBS) over Mobile Multi-hop Relay (MMR) network using dynamic modification of Modulation and Coding Scheme (MCS) level are provided. The method comprises deciding MCS level for transmission between base station (BS) and relay station (RS), deciding MCS level for transmission between the BS and RS, and transmitting an MCS control message to the RS informing of the MCS level for transmission between the RS and the MS comprises calculating spectrum efficiency of the MS (ME), and selecting MCS level corresponding to the ME as optimum MCS level for the transmission between the RS and the MS.