Dynamic Random Access Resource Indication via Physical Layer Signaling
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Solution Overview
Problem
The existing semi-static random access resource allocation in LTE communications systems is limited by predefined uplink-downlink subframe configurations, which restricts radio resource allocation flexibility and is not applicable in systems where uplink and downlink resources are dynamically determined by the network.
Innovation Solution
The method involves dynamically indicating the resource of a physical random access channel using physical layer control signaling, specifically sending first indication information for the frequency domain resource and second indication information for the time domain resource, allowing for real-time dynamic indication and improved flexibility in random access resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If semi-static random access resource allocation is used with predefined uplink-downlink subframe configurations, then the system maintains simplicity and compatibility with existing LTE standards, but radio resource allocation flexibility is restricted and cannot support dynamically determined uplink and downlink resources
Solution Approach 1:
The patent transforms the static random access resource indication into a dynamic one by introducing physical layer downlink control information (PDCI) that can be updated in real-time. The network device dynamically indicates time domain resource information through PDCI, allowing the random access resource to adapt to changing uplink-downlink configurations without requiring complete reconfiguration of the access procedure.
Solution Approach 2:
The patent segments the random access resource indication into two parts: frequency domain resource information ( conveyed through existing system information or RRC signaling) and time domain resource information (conveyed through dynamic PDCI). This segmentation allows the flexible dynamic indication of time resources while maintaining the stability of frequency resource configuration, resolving the contradiction between flexibility and complexity.
2Productivity
If physical layer control signaling is used to dynamically indicate time domain resource, then real-time dynamic indication is achieved and random access resource allocation flexibility is improved, but the system complexity increases compared to semi-static indication methods
Solution Approach 1:
The patent makes the PDCI structure universal by designing it to carry both uplink grant information and random access resource indication information. The same physical layer control signaling mechanism serves multiple functions: scheduling uplink data transmission and indicating random access time resources, thereby reducing overall signaling complexity while achieving dynamic indication.
Solution Approach 2:
The patent employs preliminary action by pre-defining the relationship between PDCI and random access resources. The network device pre-configures the mapping rules between PDCI formats and random access time domain resources, so that when PDCI is received, the UE can immediately determine the random access resource without complex real-time processing, thus improving efficiency while controlling complexity.
Data Source
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Figure 3
Figure 3.1
AI summary
Embodiments of the present invention provide a data transmission method, a network device, and user equipment, including: sending, by the network device, first indication information and second indication information to the user equipment, where the first indication information is used to indicate a frequency domain resource of a physical random access channel of the user equipment, the second indication information is physical layer control signaling, the second indication information is used to indicate a time domain resource of the physical random access channel, and a random access resource corresponding to the frequency domain resource and the time domain resource is used to carry random access information of the user equipment. In the embodiments of the present invention, a resource of a random access channel is dynamically indicated by using the physical layer control signaling, to improve random access resource allocation flexibility.