Power Headroom Reporting for Inter-eNB Carrier Aggregation
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Solution Overview
Problem
Current power headroom reporting mechanisms in LTE-A systems are inadequate for scenarios where carriers controlled by different eNBs are aggregated for a User Equipment (UE), leading to inefficiencies in scheduling and resource management.
Innovation Solution
A method and system for reporting power headroom information where a User Equipment (UE) determines and transmits power headroom information to multiple network side apparatuses, either by forwarding to one apparatus for redistribution, transmitting to each apparatus individually, or reporting to each apparatus directly, enabling effective scheduling across aggregated cells controlled by different eNBs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carriers controlled by different eNBs are aggregated for a UE, then the system can accommodate improved peak rates and full use of spectrum resources, but the existing PHR mechanism cannot be applied anymore
Solution Approach 1:
The patent segments the PHR reporting mechanism by introducing separate reporting paths for different eNBs. When carriers from multiple eNBs are aggregated, the UE can report PHR information to each respective eNB independently, allowing the system to maintain compatibility with existing PHR mechanisms while supporting multi-eNB carrier aggregation for improved peak rates
Solution Approach 2:
The patent introduces an intermediary coordination mechanism where PHR information from multiple eNBs can be collected and processed through a centralized entity or coordinated protocol. This intermediary layer enables the existing PHR mechanism to function in multi-eNB scenarios by mediating between the distributed eNBs and the UE, thus resolving the incompatibility issue
2Reliability
If PH information is reported for all activated serving cells controlled by different eNBs to each eNB, then scheduling decisions can be improved, but the signaling overhead and complexity increase
Solution Approach 1:
The patent applies local quality by allowing each eNB to receive and process only the PHR information relevant to its controlled carriers. Instead of every eNB receiving complete PHR information for all cells, each eNB gets tailored information for its local context, improving scheduling accuracy while reducing unnecessary processing complexity at each node
Solution Approach 2:
The patent inverts the traditional centralized PHR reporting approach by allowing distributed reporting where each eNB receives PHR information directly from the UE for its controlled carriers. This inversion from centralized to distributed reporting reduces signaling overhead and complexity while maintaining or improving scheduling decision accuracy through localized information processing
Data Source
Figure 1~3A
Figure 3B~5
AI summary
Embodiments of the present invention relate to wireless communication technology field, especially relate to a method, system and apparatus for power headroom report, for the use of power headroom report when a User Equipment(UE) aggregates carriers under different enhanced NodeBs(eNBs). Embodiments of the present invention provide a method for power headroom report, including: a user equipment which aggregates resources of multiple network equipment determines power headroom information; said user equipment sends said power headroom information to at least one of the network equipment participating in aggregation. Because the user equipment which aggregates resources of multiple network equipment reports the power headroom information to at least one of the network equipment participating in aggregation, sequentially the power headroom information is enabled to be reported when the UE aggregates carriers under different eNBs, multiple eNBs further can obtain the power headroom information in the case of inter-eNBs-aggregation, and resource scheduling is enabled.