Secondary-Cell Downlink for Primary-Cell Random Access
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in random access procedures due to excessive resource utilization when a user equipment (UE) monitors for physical downlink control channels on both a primary and secondary cell, leading to increased processing and network resource consumption.
Innovation Solution
The UE initiates a random access procedure by monitoring and receiving physical downlink control channel communications solely on a secondary cell, which conveys information for the primary cell, thereby reducing the need to monitor both cells and optimizing resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE monitors for physical downlink control channels on both primary and secondary cells, then the random access procedure can be reliably executed, but processing and network resource consumption increases
Solution Approach 1:
The patent extracts the random access procedure execution from the primary cell and relocates it to the secondary cell. The UE monitors for and receives the random access response on the secondary cell instead of the primary cell, thereby separating the random access function from the primary cell's normal operations and reducing the primary cell's resource burden while maintaining procedural reliability
Solution Approach 2:
The secondary cell acts as an intermediary for carrying out the random access procedure. By using the secondary cell as a mediator to handle the random access response transmission, the system achieves reliable random access execution without requiring the primary cell to dedicate additional resources, thus resolving the contradiction between reliability and resource consumption
2Loss of information
If the UE monitors for physical downlink control channels on both primary and secondary cells, then complete random access information can be received, but device complexity and processing overhead increase
Solution Approach 1:
The patent extracts the random access response reception function from the primary cell monitoring process and places it on the secondary cell. This separation reduces the number of cells the UE must simultaneously monitor for random access-related information, thereby reducing device complexity and processing overhead while ensuring complete random access information is still received through the secondary cell
3Loss of information
If the UE monitors both primary and secondary cells for random access procedures, then comprehensive channel information is obtained, but power consumption increases
Solution Approach 1:
The secondary cell serves as an intermediary that carries the random access response information. The UE configures the secondary cell specifically for this purpose and monitors it for the random access response, obtaining comprehensive downlink channel information through this dedicated intermediary channel without the need to continuously monitor both cells at full capacity, thus reducing power consumption while maintaining information completeness
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment may determine to initiate a random access procedure for a primary cell; and receive, on a secondary cell of the primary cell, at least one physical downlink control channel communication conveying information associated with the random access procedure for the primary cell. Numerous other aspects are provided.