Non-Contention Random Access Using Dedicated Preambles
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Solution Overview
Problem
Conventional contention-based random access methods in wireless communication systems result in significant time delays, particularly in carrier aggregation scenarios, where uplink synchronization takes around 25 ms, leading to inefficiencies in data transmission.
Innovation Solution
Implementing a non-contention based random access method using dedicated preambles, where a sending device and a receiving device utilize multiple wireless carriers for state buffer management and data exchange, allowing for synchronized data transmission without the need for Msg3 and Msg4, thereby reducing synchronization time to approximately 12 ms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If contention-based random access is used, then multiple mobile stations can access the network independently, but synchronization time increases to about 25 ms
Solution Approach 1:
The base station pre-allocates dedicated preambles to mobile stations before random access is needed. This preliminary assignment eliminates the contention resolution process (Msg3 and Msg4) that would otherwise be required, reducing synchronization time from 25 ms to approximately 12 ms while maintaining independent access capability
2Loss of time
If non-contention based random access with dedicated preambles is used, then synchronization time is reduced to approximately 12 ms, but device complexity increases due to preamble management
Solution Approach 1:
Dedicated preambles serve multiple functions: they act as random access signals, carry mobile station identification, and enable uplink synchronization. This multi-functionality reduces the need for separate signaling messages (Msg3 and Msg4), thereby reducing synchronization time while the complexity is managed through efficient resource allocation
3Adaptability or versatility
If contention-based random access is used, then resource allocation is dynamic, but data transmission efficiency decreases due to prolonged synchronization
Solution Approach 1:
The base station performs preliminary allocation of dedicated preambles based on predicted traffic patterns and channel conditions. This allows mobile stations to quickly access the network without contention, improving data transmission efficiency while maintaining dynamic resource allocation through periodic reallocation and adaptation to changing conditions
Data Source
AI summary
A wireless communication system includes a sending device and a receiving device. The sending device includes a first control unit that sends the state of a buffer by using a first wireless carrier, and a first random access management unit that manages random access performed by the sending device. The receiving device includes a second control unit that receives the state of the buffer by using the first wireless carrier and that performs a data exchange by using a second wireless carrier on the basis of the state of the buffer, and a second random access management unit that manages random access performed by the receiving device. The second random access management unit sends control information that includes a dedicated preamble that is unique to a device. The first and the second random access management units perform non-contention based random access that uses the dedicated preamble.