Uplink Synchronization Control for Mobile User Equipment
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Solution Overview
Problem
In mobile communication systems using OFDM or SC-FDMA, continuous allocation of radio resources to user equipment for call connection is inefficient, especially in packet-based services where data transmission is intermittent, leading to unnecessary resource usage and potential interference due to synchronization issues between user equipment.
Innovation Solution
A method for controlling uplink synchronization state in user equipment, involving receiving control information from the network to release allocated resources when shifting from a synchronized to an asynchronous state, performing random access procedures using dedicated preambles, and managing channel resources based on synchronization state to optimize resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If radio resources are continuously allocated to user equipment for call connection, then connection stability is improved, but resource utilization efficiency deteriorates
Solution Approach 1:
The patent applies dynamics by transitioning from static continuous resource allocation to dynamic resource allocation based on synchronization state. The base station dynamically adjusts resource allocation according to whether the user equipment is in synchronized or asynchronous state, allowing resources to be allocated only when needed for actual data transmission while maintaining connection stability through conditional allocation.
Solution Approach 2:
The patent changes the parameter of resource allocation from continuous to conditional based on synchronization state. By monitoring synchronization status and adjusting allocation decisions accordingly, the system optimizes resource utilization while maintaining reliable connections when needed.
2Reliability
If radio resources are continuously allocated to user equipment, then connection stability is improved, but harmful interference increases
Solution Approach 1:
The system dynamically adjusts resource allocation based on synchronization state, allocating resources only when the user equipment is in synchronized state and releasing them when asynchronous. This dynamic approach maintains connection stability when needed while preventing harmful interference during asynchronous periods when the user equipment cannot properly receive downlink data.
3Reliability
If uplink synchronization is maintained continuously, then data transmission reliability is improved, but resource consumption increases
Solution Approach 1:
The patent implements periodic monitoring of synchronization state and conditional resource allocation. Instead of continuous resource allocation, the system periodically checks synchronization status and allocates resources only when needed, reducing energy consumption while maintaining data transmission reliability during active periods.
Solution Approach 2:
The system changes the parameter of resource allocation from continuous to conditional based on synchronization state monitoring. This allows the system to maintain uplink synchronization and data transmission reliability when needed while reducing resource consumption during asynchronous periods.
Data Source
AI summary
A method of controlling uplink synchronization state at a user equipment in a mobile communication system is disclosed. The method of controlling an uplink synchronization state at a user equipment in a mobile communication system comprises receiving control information associated with controlling uplink synchronization state of the user equipment from a network, releasing uplink resources allocated from the network if the uplink synchronization state is shifted from a synchronization state to an asynchronous state based on the control information.