Uplink Random Access via Preamble and Control Message Mapping
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Solution Overview
Problem
Conventional uplink random access procedures in wireless network systems are inefficient when a wireless apparatus repeatedly requests resources, as they involve redundant steps, particularly in transmitting and receiving adjustment information that remains unchanged.
Innovation Solution
The uplink random access procedure is optimized by transmitting an uplink signal with a preamble sequence on a random access channel (RACH) and a control message on an uplink shared channel (UL-SCH) according to a mapping rule, allowing the base station to detect the preamble and retrieve the control message directly from the same signal, thereby omitting the need for a downlink signal with a random access response message.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the wireless apparatus transmits a first uplink signal with preamble sequence on RACH and receives a first downlink signal with random access response message, then the base station can adjust transmission parameters and allocate resources, but the process becomes redundant when adjustment information remains unchanged across multiple access procedures
Solution Approach 1:
The patent extracts and removes the redundant downlink signal with random access response message from the conventional four-step procedure. By taking out this unnecessary step, the patent reduces the random access procedure to two steps: transmitting uplink signal with preamble and control message, and base station receiving and processing this single signal, thereby eliminating time loss when adjustment information is unchanged.
Solution Approach 2:
The patent merges the preamble sequence transmission and control message transmission into a single uplink signal. The control message includes both the identity information and the resource request information, combining multiple functions into one signal transmission, which streamlines the procedure and removes the need for separate downlink response signals.
2Reliability
If the wireless apparatus performs complete uplink random access procedure repeatedly to request more resources, then resource allocation is ensured, but redundant information exchange increases system complexity and processing overhead
Solution Approach 1:
The patent extracts and removes the redundant downlink signal with random access response message from the conventional four-step procedure. By taking out this unnecessary step, the patent reduces the random access procedure to two steps: transmitting uplink signal with preamble and control message, and base station receiving and processing this single signal, thereby eliminating time loss when adjustment information is unchanged.
Solution Approach 2:
The uplink signal serves multiple functions simultaneously: the preamble sequence provides timing alignment and power adjustment reference, while the control message carries both identity information and resource request information. This multi-functionality reduces the need for separate signals and simplifies the overall procedure while maintaining reliability.
Data Source
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AI summary
A wireless apparatus, a base station and uplink contention methods thereof are provided. The wireless apparatus selects a preamble sequence and at least one resource block on an uplink shared channel (UL-SCH) according to a mapping rule.. The wireless apparatus transmits an uplink signal with a preamble sequence on a random access channel (RACH) and a control message on the at least one resource on the UL-SCH to a base station. The base station detects the preamble sequence from the RACH, and retrieves the control message from the at least one resource block on the UL-SCH according to the mapping rule.