Aggregated Random Access Response Handling on Single Component Carrier
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Solution Overview
Problem
The existing LTE system faces inefficiencies in random access channel signaling, particularly in TDD systems, due to limited PDCCH resources and inflexible distribution of random access responses across multiple component carriers, leading to increased complexity and delay in UE receiver operations.
Innovation Solution
The method involves receiving random access requests from multiple user equipment in different time and frequency resources across various component carriers and transmitting bundled random access responses in a single component carrier, optimizing PDCCH resource usage and simplifying UE receiver operations by allowing flexible selection of the response carrier.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If random access responses are distributed across multiple component carriers, then the system can handle more random access requests simultaneously, but the PDCCH resource consumption increases and UE receiver complexity increases
Solution Approach 1:
The patent combines multiple random access responses from different component carriers into a single aggregated response transmitted on one component carrier. This merging approach maintains the system's ability to handle multiple random access requests simultaneously while reducing UE receiver complexity by consolidating the response handling into a single carrier instead of requiring the UE to monitor and process responses across multiple carriers.
2Ease of operation
If random access responses are transmitted on the same component carrier as the random access requests, then the signaling is simplified, but the PDCCH resources on that carrier may be insufficient
Solution Approach 1:
The patent segments the random access response transmission by allowing different component carriers to be used for requests and responses. Random access requests can be transmitted on one component carrier while the aggregated responses are transmitted on another component carrier, thereby separating the signaling paths and preventing PDCCH resource exhaustion on any single carrier.
3Loss of energy
If random access responses are aggregated on a single component carrier, then PDCCH resource usage is optimized and UE operations are simplified, but the system must select which carrier to use for responses
Solution Approach 1:
The patent introduces dynamic carrier selection mechanisms where the network can flexibly choose which component carrier to use for transmitting aggregated random access responses based on current system conditions, load distribution, and resource availability. This dynamic approach allows the system to optimize PDCCH resource usage while maintaining adaptability to different operating scenarios through configurable carrier selection.
Data Source
AI summary
Disclosed herein are methods, computer program instructions and apparatus for performing random access procedures in a wireless communication system. A method includes receiving at a network access node, in different time and frequency resources that are allocated for preamble transmission, and in different ones of a plurality of component carriers, a plurality of random access requests from individual ones of a plurality of user equipments; and transmitting a corresponding plurality of random access responses in a time and frequency resource of a single component carrier.