Call Re-establishment Using Layer Information in Heterogeneous Networks
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Solution Overview
Problem
In heterogeneous networks with multiple layers and carrier frequencies, radio link failures pose challenges for call re-establishment due to the non-uniqueness of Physical Cell Identifiers (PCIDs), as they can be shared across different layers and frequencies, making it difficult for user equipment to identify the correct cell for re-establishment.
Innovation Solution
The method involves sending a request to re-establish a connection that includes layer information such as the carrier frequency, global cell identifier, and Absolute Radio Frequency Channel Number, allowing the network to uniquely identify the former serving cell and fetch necessary context information for successful handover.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If Physical Cell Identifiers (PCIDs) are reused across different layers and frequencies to increase network capacity, then the network can support more cells and users, but it becomes difficult to uniquely identify the correct cell for call re-establishment after radio link failure
Solution Approach 1:
The patent adds layer information (carrier frequency, absolute radio frequency channel number) as an additional dimension to the cell identification process. Instead of relying solely on PCID, the system now uses a combination of PCID plus layer information to uniquely identify cells across multiple layers and frequencies, resolving the ambiguity caused by PCID reuse.
Solution Approach 2:
The patent introduces layer information as an intermediary element that mediates between the reused PCID and the actual cell identification. This intermediary provides the additional context needed to disambiguate which specific cell is being referenced when multiple cells share the same PCID across different layers.
2Measurement precision
If layer information is added to the connection re-establishment request to enable unique cell identification, then accurate cell identification is achieved, but the signaling overhead and message complexity increase
Solution Approach 1:
The patent makes the existing connection re-establishment request message multi-functional by adding layer information fields to it. This allows the same message structure to serve both its original purpose of requesting connection re-establishment and the additional purpose of providing precise cell identification, avoiding the need for separate signaling messages.
Solution Approach 2:
The patent merges the cell identification function with the connection re-establishment request by incorporating layer information directly into the request message. This combination eliminates the need for separate identification signaling and reduces overall message complexity despite adding identification capabilities.
Data Source
AI summary
Methods and apparatus, including computer program products, are provided for call re-establishment. In one aspect there is provided a method. The method may include determining a radio link failure between a user equipment and a base station; and sending, by the user equipment after the determined radio link failure, a request to re-establish a connection, wherein the request includes layer information identifying the base station in a network. Related apparatus, systems, methods, and articles are also described.