eDRX Paging Occasion Determination by Coverage Enhancement Level
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Solution Overview
Problem
In LTE networks, the existing paging procedures in eDRX mode lead to uneven distribution of paging load across different Paging Occasions (POs), resulting in radio resource wastage and increased delay due to unnecessary repetitions of PDCCH and PDSCH messages for UEs with lower Coverage Enhancement Level (CEL) values, which causes excessive power consumption and inefficient resource utilization.
Innovation Solution
A method to determine POs in eDRX cycles based on estimated UE Identity values and CEL levels, allowing for uniform distribution of UEs across POs and optimizing radio resource allocation by categorizing UEs based on their CEL values, thereby minimizing redundant message transmissions and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same UE_ID is used for computing both Paging Hyper-frames and Paging Frames, then the paging procedure is simplified, but the paging load distribution becomes uneven across different POs
Solution Approach 1:
The patent segments the UE identity space by introducing two separate identifiers: UE_ID_H (derived from IMSI) for hyper-frame calculation and UE_ID (derived from S-TMSI or other temporary identifiers) for frame and subframe calculation. This segmentation allows independent optimization of each level's load distribution without affecting the other, resolving the contradiction between procedural simplicity and load uniformity.
Solution Approach 2:
Different parts of the paging procedure use different identity derivation methods: UE_ID_H uses IMSI-based calculation for hyper-frame determination, while UE_id uses temporary identifier-based calculation for frame/subframe determination. This local differentiation optimizes load distribution at each specific level while maintaining overall system functionality.
2Reliability
If PDCCH and PDSCH are transmitted with high repetition level to ensure reliable decoding for all UEs, then decoding reliability is improved, but power consumption and radio resource usage increase for UEs with lower CEL values
Solution Approach 1:
The patent applies local quality by associating specific POs with specific CEL levels. UEs with lower CEL values are assigned to POs that use lower repetition levels, while only UEs requiring higher coverage enhancement monitor POs with higher repetition levels. This ensures each UE receives appropriate transmission quality without unnecessary resource consumption.
Solution Approach 2:
The patent segments the PO monitoring requirement by CEL level, creating separate monitoring sets for different coverage conditions. This segmentation allows the system to optimize transmission parameters for each segment independently, preventing low-CEL UEs from consuming resources allocated for high-CEL scenarios.
3Reliability
If PDCCH and PDSCH are transmitted with high repetition level to ensure reliable decoding, then radio resource capacity is maintained, but unnecessary repetitions cause resource wastage when UEs with lower CEL values monitor the same PO
Solution Approach 1:
Different POs are configured with different repetition levels based on the CEL requirements of UEs assigned to those POs. This local optimization ensures that repetition resources are allocated only where needed, preventing wastage on POs monitored by UEs that can decode with lower repetition levels.
Solution Approach 2:
The patent segments POs into different groups based on CEL requirements, with each group using appropriate repetition levels. This segmentation eliminates the need for uniform high-repetition transmission across all POs, reducing overall resource consumption while maintaining reliability for each segment.
4Ease of operation
If UEs monitor POs without CEL-based categorization, then the paging procedure is simpler to implement, but UEs with lower CEL values consume excessive power monitoring redundant PDCCH and PDSCH
Solution Approach 1:
The patent segments UE monitoring behavior by CEL level, where each UE category monitors specific POs configured for its coverage requirements. This segmentation enables power optimization without significantly complicating the implementation, as the categorization is based on existing CEL parameters already used in coverage enhancement.
Solution Approach 2:
Different monitoring configurations are applied locally to different UE categories based on their CEL values. This local differentiation allows the system to maintain simple overall procedures while optimizing power consumption for specific UE groups through targeted PO assignment.
Data Source
AI summary
Embodiments herein provide a method for determining PO by UEs in an eDRX cycle. The method includes determining PHs in the eDRX cycle based on estimated values of UE_ID_H and number of hyper-frames in the eDRX cycle. The method includes determining a first radio frame of PTW based on a determined value of NPTW and ieDRX. The method includes determining a last radio frame of PTW based on the first radio frame and length of the PTW. The method includes determining PFs in the PTW. The determination of PFs is based on the UE_ID. The method includes determining the POs, in each of the determined PFs, based on an index associated with each of the POs. The index associated with each PO is computed based on the UE_ID, number of frames available for paging in a DRX cycle, and number of sub-frames available for paging in each PF.