LTE Base Station PDCCH Logical Area Segmentation for Assignment Balance
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Solution Overview
Problem
The existing radio base station systems face a high load in assignment processing due to the need for cooperation and negotiation between uplink and downlink assignment control information, leading to biased assignment of control information, where downlink control information is assigned in advance while uplink control information assignment is delayed, causing an imbalance.
Innovation Solution
A radio base station is configured with dedicated areas for uplink and downlink control information, set based on traffic volume, allowing for balanced assignment without requiring cooperation or negotiation, using an uplink dedicated area, a downlink dedicated area, and a shared area within the logical area of a radio channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If downlink assignment control information is assigned immediately upon arrival of the assignment period, then downlink control information assignment speed is improved, but uplink control information assignment is delayed due to error detection requirements, creating imbalance
Solution Approach 1:
The PDCCH logical area is divided into separate uplink control information areas and downlink control information areas. This segmentation allows independent assignment of uplink and downlink control information without interference, enabling downlink information to be assigned immediately while uplink information is assigned after error detection, without creating imbalance in the overall assignment process.
2Stability of the object's composition
If cooperation and negotiation are required between uplink and downlink assignment processing, then assignment balance is improved, but assignment processing load increases
Solution Approach 1:
By segmenting the PDCCH logical area into dedicated uplink and downlink control information areas, the system eliminates the need for cooperation and negotiation between uplink and downlink assignment processing. Each area can be filled independently, maintaining assignment balance while significantly reducing processing complexity and load.
Solution Approach 2:
The uplink and downlink assignment processing operate independently as self-service processes. The downlink assignment processing can immediately fill downlink control information areas without waiting for uplink processing status, and uplink assignment processing independently handles uplink control information after error detection, eliminating mutual dependency and reducing overall processing load.
3Reliability
If sufficient resources are reserved for PDSCH, then user information transmission reliability is improved, but PDCCH resources are reduced, limiting control information assignment capacity
Solution Approach 1:
The PDCCH logical area is divided into different quality levels or types of control information areas. By locally optimizing the structure to accommodate both uplink and downlink control information in separate dedicated areas, the system maximizes the utilization of limited PDCCH resources without compromising PDSCH resource reservations for user information transmission reliability.
Data Source
AI summary
An LTE base station 1 determines whether or not a timing for setting a logical area arrives. When the timing for setting a logical area arrives, the LTE base station 1 acquires an uplink traffic volume and a downlink traffic volume in radio communication with a radio terminal 2. On the basis of the uplink traffic volume and the downlink traffic volume, the LTE base station 1 sets an uplink dedicated logical area, a downlink dedicated logical area and a shared logical area in a logical area for one PDCCH.