Small Cell Cluster Signaling Reduction
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Solution Overview
Problem
Current small cell deployments face challenges in managing cell updates for mobile subscribers transitioning between small cells, particularly in the context of updating a small cell gateway, which can overload resources when many users are transitioning, making it difficult to support CELL_PCH mode effectively.
Innovation Solution
The system assigns unique identifiers to Home Node Bs within a cluster, allowing them to communicate directly and complete cell updates locally without involving the HNB-GW, using peer-to-peer protocols to manage U-RNTIs and perform transport network layer updates, thereby reducing signaling load on the HNB-GW.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cell updates are registered with HNB-GW for each UE transitioning between small cells, then mobility management is maintained, but HNB-GW resources become overloaded when many UEs are transitioning
Solution Approach 1:
The patent segments the small cell network into clusters, each with a cluster identifier. Cell updates within the same cluster are handled locally by the target HNB without involving the HNB-GW, while updates between clusters still register with HNB-GW. This segmentation reduces HNB-GW signaling load by filtering out intra-cluster mobility events.
Solution Approach 2:
The patent introduces cluster identifiers as an intermediary layer between HNBs and HNB-GW. The cluster ID is included in cell update messages, allowing HNB-GW to quickly determine whether registration is needed (inter-cluster) or if local handling suffices (intra-cluster), reducing unnecessary HNB-GW processing.
2Extent of automation
If HNB-GW is involved in every cell update, then centralized control is maintained, but signaling load on backhaul increases
Solution Approach 1:
The patent divides the network into HNB clusters identified by cluster identifiers. Cell updates within clusters are handled autonomously by HNBs without HNB-GW involvement, while inter-cluster updates maintain centralized control through HNB-GW registration. This reduces backhaul signaling by filtering out intra-cluster events.
Solution Approach 2:
HNBs within the same cluster perform self-service by handling cell updates locally without requiring HNB-GW intervention. The target HNB uses the cluster identifier in incoming cell updates to determine local handling is sufficient, reducing backhaul signaling load while maintaining network control.
3Productivity
If cell updates are handled locally within clusters, then signaling load on HNB-GW is reduced, but coordination between HNBs must be established
Solution Approach 1:
The patent uses cluster identifiers as a simple intermediary mechanism that HNBs include in cell update messages. This allows HNBs to determine whether local handling or HNB-GW registration is needed without complex coordination protocols, reducing HNB-GW load while maintaining manageable system complexity.
Data Source
AI summary
An example method is provided in one example embodiment and may include assigning an identifier to each of a plurality of Home Node Bs (HNBs); receiving a cell update for a user equipment (UE) transitioning from a first HNB to a second HNB, wherein the cell update for the UE includes a first identifier associated with the first HNB and wherein the UE is in a cell paging channel (PCH) mode; determining based, at least in part, on the first identifier associated with the first HNB, whether the first HNB is operating within a cluster of HNBs including the second HNB; and withholding registration of the cell update for the UE with an HNB gateway (HNB-GW) if the first HNB is operating within the cluster of HNBs including the second HNB until packet switched (PS) traffic for the UE is received by the second HNB.