Selective X2 Cell Reporting Through vBBU Neighbor Filtering
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Solution Overview
Problem
In heterogeneous networks, the existing X2GW mechanism broadcasts all cell additions, deletions, or modifications to neighboring macro eNBs, leading to unnecessary network load and increased processing time due to unwanted X2 connections and signaling.
Innovation Solution
Optimized X2 cell reporting by selecting a subset of virtualized BaseBand Units (vBBU) vnodes that have reported the X2 peer eNB as a neighbor or host cells reported by the X2 peer eNB as neighbors, advertising these cells as served-cells in X2-Setup Request/Response towards the macro eNB.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If all cell additions, deletions, or modifications are broadcast to neighboring macro eNBs, then complete information is provided to neighbors, but network load and processing time increase significantly
Solution Approach 1:
The patent extracts only the relevant subset of cell information that needs to be reported to macro eNBs, rather than broadcasting all cell additions, deletions, or modifications. The X2GW filters and identifies only those cells that are actually detected as neighbors by the macro eNB, sending only this subset in X2-Setup Request/Response messages, thereby reducing unnecessary network load while maintaining information completeness for relevant cells.
Solution Approach 2:
Instead of performing complete broadcasting of all cell information, the patent applies partial action by selectively reporting only the necessary subset of cells. This partial reporting approach reduces the volume of signaling messages and network load while still providing sufficient information for the macro eNB to establish appropriate X2 connections with vBBU vnodes.
2Loss of information
If all cell updates are broadcast to macro eNB, then comprehensive cell information is available, but processing time increases due to encoding and decoding multiple served cells
Solution Approach 1:
The patent extracts only the essential cell update information that is actually needed by the macro eNB for neighbor cell management. By identifying and reporting only the subset of cells that are detected as neighbors, the system reduces the amount of data that requires encoding and decoding processing, thereby decreasing processing time while maintaining necessary information availability.
Solution Approach 2:
The patent implements partial action by reporting only the necessary subset of cell updates rather than all updates. This selective reporting reduces the computational burden of encoding and decoding multiple served cells at the X2GW and macro eNB, directly reducing processing time while still providing complete information for the relevant neighbor cells.
3Loss of information
If X2 connections are established with all vBBU vnodes, then all cells are covered, but unnecessary X2 connections increase network complexity
Solution Approach 1:
The patent extracts and establishes X2 connections only with the specific vBBU vnodes that host cells detected as neighbors by the macro eNB. Rather than creating X2 connections with all vBBU vnodes in the system, the X2GW identifies and connects only to the relevant subset, reducing X2 connection complexity while ensuring complete coverage of all neighbor cells.
Solution Approach 2:
The patent applies local quality by making the X2 connection establishment specific to local needs - each macro eNB receives X2 connections from vBBU vnodes based on its specific neighbor cell detection, rather than a uniform approach connecting to all vBBU vnodes. This localized connection strategy reduces overall network complexity while maintaining appropriate coverage for each macro eNB's neighborhood.
Data Source
AI summary
Methods, systems and computer readable media are disclosed for providing optimized X2 cell reporting. A method includes selecting a subset of virtualized BaseBand Units (vBBU) vnodes to a macro peer that have either reported the X2 peer eNB as a neighbor, or host a cell that the X2 peer eNodeB (eNB) has reported as a neighbor while advertising the neighboring cells towards macro; and advertising cells of this subset of vBBU vnodes as served-cells in X2-Setup Request/Response towards a macro.