PDCCH Resource Configuration for 5G Random Access
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Solution Overview
Problem
The conventional wireless communication systems, such as LTE, face challenges in efficiently configuring control channel resources for random access related information and other system information, leading to potential conflicts and inefficiencies in the random access process, especially with the increasing demand for higher data rates and the integration of IoT devices in 5G networks.
Innovation Solution
The proposed solution involves configuring control channel resources by deriving or generating system information that includes resource configuration details for PDCCH, allowing for precise scheduling of random access responses, contention resolution messages, and other system information, using methods such as establishing relations or providing exact resource indicators to optimize resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional system information configuration methods are used, then implementation simplicity is maintained, but control channel resource allocation efficiency deteriorates
Solution Approach 1:
The system information is segmented into first system information and second system information, where the first contains resource configuration information for PDCCH scheduling the second. This segmentation allows efficient resource allocation by separating configuration data from scheduled data, resolving the contradiction between allocation efficiency and configuration complexity.
Solution Approach 2:
The resource configuration information for PDCCH is provided in advance within the first system information, before the actual scheduling of the second system information. This preliminary action enables user equipment to efficiently allocate control channel resources without encountering conflicts during the random access process.
2Productivity
If random access preamble resources are shared among multiple users, then resource utilization is improved, but conflict probability increases
Solution Approach 1:
The base station provides resource configuration information for PDCCH in the first system information, creating a feedback mechanism that allows user equipment to adjust their random access transmissions based on allocated control channel resources. This feedback loop reduces conflicts by ensuring users transmit on properly configured resources rather than randomly selected ones.
Solution Approach 2:
The PDCCH acts as an intermediary between the shared random access preamble resources and the individual user transmissions. By providing dedicated PDCCH resource configuration to each user, the system mediates the shared resource access, allowing multiple users to utilize common preamble resources while maintaining individualized control channel allocation to prevent conflicts.
3Reliability
If control channel resources are configured separately for each user, then conflict resolution is improved, but signaling overhead increases
Solution Approach 1:
The first system information serves multiple functions: it carries general system information and simultaneously provides resource configuration information for PDCCH scheduling the second system information. This multi-functionality allows conflict resolution through dedicated resource configuration without proportionally increasing signaling overhead, as the same information structure serves dual purposes.
4Productivity
If system information periodicity is extended, then transmission frequency is reduced, but random access response timeliness deteriorates
Solution Approach 1:
System information is segmented into first and second parts with different periodicities. The first system information containing resource configuration is transmitted more frequently to ensure timely random access responses, while the second system information can have longer periodicity for efficiency. This segmentation resolves the contradiction by allowing differentiated transmission frequencies for different information types.
Data Source
AI summary
The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4th-Generation (4G) communication system such as Long Term Evolution (LTE). The present disclosure provides a method for configuring channel resource, a corresponding base station and a corresponding user equipment. The method comprises receiving first system information, and deriving resource configuration information for PDCCH that schedules second information from the received first system information.