MME Paging Frame Calculation for eDRX Signaling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems, particularly in 3GPP LTE, the Mobility Management Entity (MME) faces a challenge when performing paging for user equipment (UE) with extended discontinuous reception (eDRX) support, as it lacks knowledge of the paging frame, leading to intensive S1 signaling at specific times.
Innovation Solution
The MME computes a paging frame (PF) and hyperframe (PH) based on the received nB value, UE_ID, and DRX cycle, allowing for efficient transmission of paging messages within the wireless communication system, thereby reducing intensive S1 signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the MME transmits a paging message to a base station on the basis of a paging hyperframe without knowing the paging frame, then paging can be performed for eDRX-supportive UEs, but a large number of S1 signallings occur at a particular time
Solution Approach 1:
The paging transmission is segmented into two levels: hyperframe level (PH) and frame level (PF). The MME first determines the PH using PH = f(UE_ID, eDRX cycle), then distributes paging messages across multiple PFs within that hyperframe using PF = f(nB, UE_ID, DRX cycle). This segmentation prevents concentration of all paging signals at one time point.
Solution Approach 2:
The MME performs preliminary computation of both PH and PF values before actual paging transmission. By pre-calculating the appropriate frame numbers based on UE_ID and DRX parameters, the MME can distribute paging messages across multiple frames in advance, avoiding last-minute signaling congestion.
2Quantity of substance
If the MME computes paging frame based on nB, UE_ID, and DRX cycle, then paging can be distributed across multiple frames, but the computation complexity increases
Solution Approach 1:
The paging frame computation is self-service in nature, using automatically available parameters (UE_ID from IMSI mod 1024, DRX cycle from UE capability, nB from system configuration) to determine PF and PH values without requiring additional signaling or complex external computations.
Solution Approach 2:
The system uses parameter changes in the mathematical formulas to achieve distribution. By varying nB values (4T, 2T, T, T/2, T/4, etc.) and applying different modular arithmetic operations on UE_ID and DRX cycle, the system generates diverse PF assignments that distribute signaling load while maintaining computational efficiency.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Provided are a method for performing paging by a mobility management entity (MME) in a wireless communication system and an apparatus for supporting the same. The MME comprises: receiving an nB from a base station; calculating a paging frame (PF) on the basis of the nB; and transmitting a paging message to the base station on the basis of a paging hyperframe (PH) and the calculated PF, wherein the PH may indicate a number of a hyper system frame in which the paging message is to be transmitted, and the PH may indicate a number of a system frame in which the paging message is to be transmitted.