Over-the-Air Interference Coordination for Base Station Scheduling
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Solution Overview
Problem
In wireless communications systems, independent scheduling by base stations can lead to interference between UEs due to concurrent transmissions, especially when base stations are connected via non-ideal backhaul links, affecting transmission reliability.
Innovation Solution
Implementing over-the-air (OTA) interference coordination messaging among base stations to modify scheduling decisions, using schemes like beam fixation, suppression, or avoidance to mitigate and stabilize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If base stations perform independent scheduling, then scheduling flexibility and device complexity are improved, but interference between UEs increases and transmission reliability deteriorates
Solution Approach 1:
The patent introduces an interference coordination message as an intermediary mechanism between independently scheduling base stations. This message carries scheduling decision information that allows base stations to coordinate their transmissions without centralized control, thereby maintaining scheduling flexibility while reducing interference to improve transmission reliability
Solution Approach 2:
The interference coordination message establishes a feedback loop where base stations exchange scheduling information and adjust their transmissions accordingly. This feedback mechanism enables base stations to adapt their scheduling decisions based on interference conditions, resolving the contradiction between independent operation and interference management
2Device complexity
If base stations are connected via non-ideal backhaul links, then device complexity and ease of operation are improved, but interference coordination capability deteriorates and transmission reliability worsens
Solution Approach 1:
The interference coordination message serves as a lightweight intermediary that enables essential coordination over non-ideal backhaul links. By using this simplified messaging mechanism, the patent achieves interference coordination without requiring complex centralized control systems, thus maintaining low network complexity while improving transmission reliability
Solution Approach 2:
The patent changes the coordination approach from centralized control to distributed exchange of scheduling parameters through interference coordination messages. This parameter-based coordination adapts well to non-ideal backhaul conditions, maintaining system reliability without increasing network complexity
3Reliability
If interference coordination messaging is implemented, then transmission reliability is improved, but device complexity and loss of information increase
Solution Approach 1:
The patent extracts only the essential scheduling decision information needed for interference coordination into the interference coordination message. By taking out only the critical parameters rather than exchanging complete scheduling data, the system improves transmission reliability while minimizing message processing complexity and information overhead
Data Source
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AI summary
Methods, systems, and devices for wireless communications are described. In some systems, transmissions from a neighboring base station may interfere with downlink transmissions from a serving base station to a target user equipment (UE). To coordinate interference between the base stations (e.g., mitigate interference, stabilize interference, etc.), the serving base station may generate an interference coordination message and may transmit the message over-the-air (OTA) to one or more neighboring base stations. The message may include parameters indicating a coordination scheme for the neighboring base station(s) to use for modifying one or more scheduling decisions. The coordination scheme may be configured or dynamically selected and may include interfering beam fixation, interfering beam suppression, or interfering beam avoidance. A neighboring base station receiving the OTA interference coordination message may modify a scheduling decision to mitigate or stabilize interference when the serving base station is transmitting to the target UE.