Contention Based Access Channel State Information Transmission Point Selection
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Solution Overview
Problem
Heterogeneous cellular networks face challenges with increased signaling overhead and interference due to the complexity of managing connections in multi-cell environments, particularly for devices with limited capabilities like sensors in Machine Type Communication (MTC), which affects data payload and latency.
Innovation Solution
A method that determines uplink and downlink transmission points during the access procedure based on radio channel conditions, using channel state information to establish connections without additional signaling, thereby optimizing channel quality and reducing signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If heterogeneous cellular networks deploy multiple small cells to complement macro cells, then network coverage and capacity are improved, but signaling overhead and interference levels increase
Solution Approach 1:
The system performs preliminary channel state information measurements during the access procedure before actual data transmission begins. The UE measures downlink channel state from multiple transmission points and includes this information in the random access message, allowing the network to pre-determine the optimal transmission point for the connection, thereby avoiding subsequent signaling for transmission point selection.
Solution Approach 2:
The random access message serves multiple functions: it establishes the initial connection, carries channel state information for transmission point determination, and enables direct connection setup without additional signaling. This multi-functionality reduces the overall signaling overhead in heterogeneous networks.
2Productivity
If multiple transmission points are deployed in heterogeneous networks, then network capacity increases, but interference levels increase
Solution Approach 1:
The UE provides feedback in the form of channel state information measurements to the network during the access procedure. This feedback allows the network to identify which transmission point has the best channel conditions and to establish the connection through that specific point, thereby avoiding interference from other transmission points and optimizing signal quality.
3Adaptability or versatility
If signaling is increased to manage connections in heterogeneous networks, then connection management capability improves, but data payload and latency are affected
Solution Approach 1:
The channel state information is measured and reported during the access procedure itself, allowing the optimal transmission point to be determined before data transmission begins. This eliminates the need for additional signaling exchanges that would otherwise be required to select and switch to the optimal transmission point, thereby reducing latency.
4Reliability
If channel state information is measured and reported during access procedure, then connection quality is improved, but message size increases
Solution Approach 1:
The invention extracts only the essential channel state information needed for transmission point determination and includes it in the random access message. This selective extraction provides sufficient information for the network to make optimal transmission point selection while minimizing the additional message size, balancing connection quality improvement with overhead constraints.
Data Source
AI summary
There is provided receiving a message by a reception point of a communications system, wherein the received message comprises a message of a contention based access procedure indicating channel state information measured at user equipment from a transmission point of a plurality of transmission points.