Random Access Signal Identifier for Collision Reduction
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Solution Overview
Problem
Current random access mechanisms in mobile communication systems, such as UMTS LTE, face challenges in minimizing collision probability and accurately describing channel state information with limited data bits, leading to inefficiencies in resource allocation and transmission characteristics.
Innovation Solution
A method where a radio communication device selects a signal based on data to be transmitted, deriving an identifier from this data, which is then used to identify subsequent signals, allowing the radio communication station to determine the data and adjust transmission parameters without explicit identifier signaling, thereby improving system efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a limited number of data bits are transmitted in the first random access transmission, then the collision probability is reduced, but the channel state information cannot be described accurately
Solution Approach 1:
The random access process is divided into multiple stages: first random access transmission with limited bits for initial channel state indication, followed by additional signaling for more accurate channel description. This segmentation allows the system to achieve low collision probability in the first stage while maintaining the ability to transmit accurate channel state information in subsequent stages.
Solution Approach 2:
The first random access transmission performs preliminary channel state indication using a limited number of bits, which is sufficient for initial resource allocation decisions. The access point uses this preliminary information to make initial scheduling decisions while planning for more accurate channel state acquisition through subsequent signaling exchanges.
2Measurement precision
If more data bits are transmitted to accurately describe channel state information, then the channel description accuracy is improved, but the collision probability increases
Solution Approach 1:
The data transmission is segmented into multiple phases: initial phase with minimal bits for collision avoidance, followed by additional phases for detailed channel state description. This allows the system to prioritize collision avoidance in the critical first transmission while maintaining the capability to transmit comprehensive channel state information subsequently.
Solution Approach 2:
The system performs preliminary channel state indication with limited bits to enable initial access decisions, then follows up with more detailed channel state transmission. This preliminary action ensures that basic communication can proceed without requiring all bits to be transmitted simultaneously, thereby reducing collision probability.
3Measurement precision
If additional signaling is used to transmit channel state information, then the channel description accuracy is improved, but the system complexity increases
Solution Approach 1:
The channel state information is merged with the random access signaling structure itself. The access point incorporates channel state indication within the existing random access response framework, rather than adding completely separate signaling mechanisms. This merging approach enables accurate channel description while minimizing additional system complexity.
Solution Approach 2:
The random access signaling structure is designed to serve multiple functions: initial channel state indication, collision avoidance, and subsequent detailed channel state description. By making the signaling system multi-functional, the patent reduces the need for separate dedicated channel state signaling mechanisms, thereby lowering overall system complexity.
Data Source
AI summary
Data is transmitted from a radio communication device by selecting a signal dependent on data to be transmitted, transmitting to a radio communication station the selected signal as a random access transmission, deriving an identifier dependent on the data, and employing the identifier to identify a subsequently received signal intended for the radio communication device The data is received at a radio communication station by receiving the random access signal which is indicative of the data to be received, determining the data indicated by the random access signal, deriving an identifier dependent on the determined data, and including the identifier in a subsequent transmission from the radio communication station to identify the intended recipient of the subsequent transmission.