Multi-Carrier Random Access Preamble Transmission
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Solution Overview
Problem
In the Advanced-EUTRA wireless communication system, random access instructions face delays due to congestion on a single downlink carrier, leading to delayed uplink synchronization and data transmission issues.
Innovation Solution
A wireless communication system that allocates multiple component carriers between a base station and a mobile station, allowing the base station to transmit random access instructions using any available carrier, enabling dedicated or random preamble transmission without delay, even if the downlink control channel is congested, and increasing scheduling flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single downlink carrier is used for random access instructions, then the system structure is simple, but transmission delays occur when the downlink is congested
Solution Approach 1:
The patent divides the single downlink carrier into multiple component carriers (first downlink carrier and second downlink carrier). The base station can select different component carriers to transmit random access instructions based on congestion status, thereby reducing transmission delays while maintaining manageable system complexity through modular carrier structures.
Solution Approach 2:
Multiple downlink carriers are configured to serve the same function of transmitting random access instructions. The mobile station can receive random access instructions on any of the configured downlink carriers, providing redundancy and ensuring that random access can proceed even when one carrier is congested, thus reducing transmission delays.
2Adaptability or versatility
If multiple component carriers are allocated for communication, then scheduling flexibility increases, but the complexity of managing random access across carriers increases
Solution Approach 1:
The base station dynamically selects which downlink carrier to use for transmitting random access instructions based on real-time congestion status. The mobile station adaptively monitors multiple downlink carriers and processes random access instructions from any carrier, enabling flexible scheduling while managing complexity through dynamic rather than static carrier assignment.
Solution Approach 2:
The mobile station autonomously monitors multiple downlink carriers and independently determines which carrier contains the random access instruction. This self-service approach allows the mobile station to handle the complexity of multi-carrier management without requiring additional base station control overhead, thus increasing scheduling flexibility while managing complexity at the mobile station side.
Data Source
AI summary
A random access instructed by a base station apparatus and having a small delay is enabled in Advanced-EUTRA system. Upon detection of control data in any one of a plurality of component carriers, component carrier information, a preamble number, and random access channel information are extracted from the control data, and if the extracted information indicates dedicated preamble transmission, a random access channel position to be used is selected from information on random access of a component carrier specified in the component carrier information and the random access channel information, a random access preamble is generated from the information on random access and the dedicated preamble number, and the random access preamble is transmitted at the random access channel position.