Base Station Frequency Band Allocation for Cooperative Uplink
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Solution Overview
Problem
In wireless communication systems, the number of cooperating base stations can lead to inadequate frequency resources for uplink cooperative communication, as existing technologies require orthogonal frequency band allocation across all base stations, limiting efficiency.
Innovation Solution
A base station device that allows overlapping signal frequencies between cooperatively and uncooperatively received signals, enabling efficient frequency use by allocating bands such that signals from different base stations overlap at certain frequencies, and performing cancellation processes to reduce inter-user interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If orthogonal frequency band allocation is used across all base stations, then interference between base stations is reduced, but frequency resource efficiency deteriorates as the number of cooperating base stations increases
Solution Approach 1:
The patent segments frequency bands into cooperative bands (shared among cooperating base stations) and non-cooperative bands (orthogonally allocated). This segmentation allows different allocation strategies for different frequency resources, enabling efficient use of frequency resources while maintaining interference management where necessary.
Solution Approach 2:
The patent applies different frequency allocation qualities to different base stations and frequency bands. Specifically, orthogonal allocation is applied only where needed (non-cooperative bands), while cooperative bands allow non-orthogonal allocation. This local differentiation optimizes overall system efficiency without compromising reliability where required.
2Reliability
If the number of cooperating base stations is increased, then cooperative communication performance is improved, but the amount of frequency resources required increases
Solution Approach 1:
The patent merges frequency bands that can be shared among multiple cooperating base stations into cooperative frequency bands. By combining resources that can be jointly used, the system achieves improved cooperative communication performance without proportionally increasing the total frequency resources required.
Solution Approach 2:
The patent makes certain frequency bands universal by allowing multiple cooperating base stations to use the same frequency resources simultaneously. These cooperative frequency bands can be shared by multiple base stations for serving different mobile stations, thereby reducing the total frequency resources needed while maintaining communication performance.
3Productivity
If non-orthogonal band allocation is implemented for cooperative communication, then frequency resource efficiency is improved, but inter-user interference increases
Solution Approach 1:
The patent converts the potential harm of inter-user interference into a benefit by carefully managing which base stations can cause interference to which users. Through coordinated scheduling and the use of cooperative frequency bands, interference that would normally be harmful is transformed into an opportunity for improved frequency efficiency, as the system can tolerate and manage controlled interference scenarios.
Data Source
AI summary
The present invention reduces the amount of frequency resources required for uplink cooperative communication. There is provided a base station device that is applied to a communication system in which a plurality of base station devices establish cooperative communication with at least one mobile station device and includes a base station-to-base station communication section 220 and a control information determination section 216. The base station-to-base station communication section 220 communicates with another base station device when establishing cooperative communication. The control information determination section 216 allocates a band for communication use by the mobile station device in such a manner that a signal received cooperatively by another base station device and a signal received uncooperatively by another base station device overlap with each other at certain frequencies.