Multi-Carrier Random Access Resource Differentiation
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Solution Overview
Problem
Current mobile communication systems face challenges in enabling terminals to quickly perform random access while minimizing wireless resource consumption, particularly in multi-carrier environments where multiple carriers are used for communication between base stations and terminals.
Innovation Solution
The solution involves a terminal and base station configuration where multiple downlink carriers are used to transmit and receive preambles and data, allowing for the differentiation of wireless resources to prevent collisions and optimize resource usage, enabling efficient random access procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If multiple downlink carriers are used for random access, then random access speed is improved, but wireless resource consumption increases
Solution Approach 1:
The patent divides the random access procedure into multiple segments across different downlink carriers. Terminals can select from multiple downlink carriers (first downlink carrier, second downlink carrier, etc.) to receive random access responses, allowing parallel processing and faster access while distributing resource usage across carriers to manage consumption efficiently.
Solution Approach 2:
The patent introduces an additional dimension by utilizing multiple downlink carriers simultaneously for random access operations. Instead of using a single carrier sequentially, the system operates across multiple carrier dimensions, enabling terminals to receive responses from different carriers and thereby improving access speed while spreading resource utilization.
2Reliability
If multiple downlink carriers are used for random access, then random access success rate is improved, but device complexity increases
Solution Approach 1:
The patent segments the random access response reception process across multiple downlink carriers. The terminal equipment is configured to monitor and receive random access responses from different downlink carriers (first downlink carrier, second downlink carrier) based on indications from the base station, distributing the complexity across multiple independent reception paths rather than one complex sequential process.
Solution Approach 2:
The base station provides advance indications to terminal equipment about which downlink carriers will carry random access responses. This preliminary information allows terminals to pre-configure their reception parameters and selectively monitor only the relevant carriers, reducing the complexity of simultaneously processing all carriers while maintaining high success rates.
3Reliability
If wireless resources are differentiated for different terminals, then collision prevention is improved, but resource allocation complexity increases
Solution Approach 1:
The patent introduces carrier dimension as an additional resource dimension for differentiation. Instead of only differentiating resources within a single carrier (time slots, frequency bands), the system differentiates across multiple downlink carrier dimensions. Terminals receive responses on different downlink carriers based on their random access preamble transmissions, providing natural collision prevention through carrier separation while simplifying resource allocation management.
Data Source
AI summary
Provided is a system of performing a random access between a base station and a terminal using a plurality of carriers. When using the plurality of carriers, an uplink carrier and a downlink carrier may be mapped to each other in 1:n or 1:1. The terminal may perform the random access based on mapping information between the uplink carrier and the downlink carrier. A random access success rate increases and thus a time used for the random access may decrease. A wireless resource may also be effectively used.