Uplink Coverage Control via TTI Bundling and Resource Coordination
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Solution Overview
Problem
The existing mobile communication systems, particularly those using VoLTE, face challenges with low uplink data rates and reduced signal coverage compared to circuit-switched voice communication systems, necessitating improved methods for enhancing uplink coverage in wireless communication systems.
Innovation Solution
The proposed solution involves a method and apparatus for a base station to determine terminals requiring increased coverage and apply schemes such as TTI bundling, RLC segmentation, HARQ maximum retransmission frequency increase, frequency hopping, and smart uplink resource coordination to enhance uplink coverage, including the use of a resource coordinator to manage resource allocation and reduce inter-cell interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If VoLTE is used to provide high-speed data service, then data transmission rate is improved, but uplink coverage is reduced
Solution Approach 1:
The patent segments the transmission time interval into multiple bundled TTIs for uplink transmission. By dividing the data transmission across multiple time slots with repeated transmissions, the system achieves both high data rates and improved coverage through cumulative signal reception at the base station.
Solution Approach 2:
The patent applies preliminary actions by pre-configuring coverage enhancement parameters and selecting appropriate modulation and coding schemes before actual data transmission. The base station predicts coverage requirements and prepares transmission parameters in advance to ensure both high speed and adequate coverage.
2Area of stationary object
If coverage enhancement schemes are applied to all terminals, then uplink coverage is improved, but network resource waste increases
Solution Approach 1:
The patent implements local quality by applying coverage enhancement schemes selectively only to terminals located at cell edges or in poor coverage conditions. The base station identifies specific terminals requiring enhancement and applies bundled TTI or repetition schemes only to those users, while terminals in good coverage areas use normal transmission modes, thus avoiding unnecessary resource consumption.
Solution Approach 2:
The patent dynamically changes transmission parameters such as TTI bundling size, repetition factor, and modulation order based on each terminal's specific coverage condition. By adjusting these parameters adaptively rather than applying fixed enhancement to all users, the system optimizes the balance between coverage improvement and resource efficiency.
3Area of stationary object
If TTI bundling is used to increase coverage, then uplink coverage is improved, but transmission delay increases
Solution Approach 1:
The patent introduces dynamics by making TTI bundling configuration adaptable and changeable. The base station can dynamically adjust the bundling size and duration based on real-time channel conditions and terminal mobility. For stationary terminals in poor coverage, larger bundling is applied, while for mobile terminals or improving channel conditions, the bundling size is reduced or released, thus minimizing delay while maintaining coverage.
4Reliability
If resource coordination is implemented to reduce inter-cell interference, then transmission reliability is improved, but system complexity increases
Solution Approach 1:
The patent introduces an intermediary resource coordinator entity that manages inter-cell resource allocation. This intermediary collects channel state information from multiple base stations, coordinates uplink resource allocation to minimize interference, and provides centralized scheduling decisions. By placing an intermediary coordinator, the system achieves improved reliability through interference management without requiring complex peer-to-peer coordination between base stations.
Data Source
AI summary
A method and an apparatus for controlling coverage of a base station in a wireless communication system are provided. The method includes determining a coverage control target terminal among terminals within a service radius of the base station and increasing a coverage of the coverage control target terminal.