Large Cell Base Station Resource Allocation Delay Handling
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Solution Overview
Problem
In LTE radio communication systems, interference occurs between large cell and small cell base stations due to overlapping frequency bands, which conventional techniques fail to adequately address due to neglecting transmission delays in scheduling.
Innovation Solution
A large cell base station is equipped with an acquisition unit to measure transmission delays, a determination unit to allocate resources, and transmitters to send band use restriction and release information to small cell base stations, ensuring resource allocation and release timing aligns with signal propagation delays to prevent interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If band use restriction information is transmitted to the small cell base station without considering transmission delay, then resource allocation can be made quickly, but interference occurs because the large cell base station allocates resources before the small cell base station has stopped using the restricted frequency band
Solution Approach 1:
The large cell base station transmits band use restriction information to the small cell base station in advance before allocating the same frequency band to a radio terminal. This preliminary action ensures that the small cell base station has sufficient time to stop using the restricted frequency band before the large cell base station begins transmission, thereby preventing interference while maintaining efficient resource allocation.
2Object-affected harmful factors
If the large cell base station waits for transmission delay time before allocating resources, then interference is avoided, but resource allocation efficiency decreases
Solution Approach 1:
Instead of waiting passively for the transmission delay period to expire before resource allocation, the system proactively transmits band use restriction information to the small cell base station in advance. This allows the large cell base station to allocate resources immediately after the restriction information is sent, eliminating unnecessary waiting time while still preventing interference through the preemptive restriction mechanism.
Data Source
AI summary
When the provided large cell base station (100) is to allocate a resource block to a radio terminal (200) connected to said large cell base station (100), band-use restriction information that indicates use restrictions on the frequency band corresponding to the aforementioned resource block is transmitted to a small cell base station (300). The large cell base station (100) then allocates the resource block to the radio terminal (200) after an amount of time corresponding to the signal transmission delay from the large cell base station (100) to the small cell base station (300) has passed since the aforementioned transmission.