Random Access Contention Resolution via Timing Feedback
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Solution Overview
Problem
Existing random access procedures in wireless communication systems face challenges in efficiently resolving contention among multiple terminal devices attempting to access a network device simultaneously.
Innovation Solution
The proposed solution involves an apparatus that transmits a random access request comprising a random access preamble and an identifier, receives control information indicating resource and timing information, and determines the result of the random access procedure based on this control information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple terminal devices attempt to access the network device simultaneously through random access procedure, then the network device can serve multiple devices, but contention among devices cannot be efficiently resolved
Solution Approach 1:
The network device sends control information containing timing information back to terminal devices in response to their random access requests. Terminal devices use this feedback to adjust their uplink transmission timing, allowing the network device to resolve contention by identifying which devices are properly synchronized and should be granted access.
Solution Approach 2:
The patent changes the timing parameter of uplink transmissions based on the random access procedure outcome. Terminal devices adjust their transmission timing according to the control information received, transforming the timing parameter to resolve contention and enable proper resource allocation.
2Reliability
If the network device sends control information to resolve contention, then contention resolution can be achieved, but devices may misinterpret control information intended for other purposes as random access responses
Solution Approach 1:
The patent introduces timing information as an intermediary element that mediates between the random access request and the control information. Terminal devices specifically look for control information containing their timing information, which serves as a unique identifier to distinguish random access responses from other control information, preventing misinterpretation.
Solution Approach 2:
The control information is made specific to each terminal device by including device-specific timing information. This local quality ensures that terminal devices can identify control information intended for them versus other control information on the control channel, reducing misinterpretation errors.
3Measurement precision
If terminal devices transmit random access requests with identifiers, then the network device can identify devices, but the procedure becomes complex when multiple devices contend for access
Solution Approach 1:
The patent extracts the timing information from the control information and uses it as the key identifier for contention resolution. Instead of relying solely on complex identifier matching, the system extracts and utilizes the timing parameter that naturally results from the random access procedure, simplifying the overall complexity while maintaining identification accuracy.
Data Source
AI summary
Embodiments of the present disclosure relate to contention resolution in random access procedure. An apparatus transmits a random access request to a further apparatus, and the random access request comprises a random access preamble and an identifier of the apparatus for a random access procedure. The apparatus then receives, from the further apparatus, control information on a control channel addressed to the identifier, and the control information indicates at least one of a resource and timing information for communication between the apparatus and the further apparatus. Next, the apparatus determines a result of the random access procedure based at least in part on the control information.