eNB Subframe Processing for MBMS Data Integrity
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Solution Overview
Problem
In LTE systems, eNBs in MBSFN areas may transmit incorrect Dynamic Schedule Information (DSI) due to loss of consecutive MBMS data packets or type 0 PDU groups, leading to interference with other eNBs and incorrect data reception by UEs.
Innovation Solution
The eNB sets a subframe used to transmit DSI to null if it fails to receive at least two consecutive MBMS data packets or a type 0 control packet group, preventing the transmission of incorrect DSI and ensuring accurate data reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the eNB transmits DSI based on received MBMS data packets, then the scheduling efficiency is improved, but the reliability deteriorates when data packets are lost during transmission
Solution Approach 1:
The eNB performs preliminary detection of data packet continuity before generating DSI. By checking whether data packets are continuous in advance, the system prevents generation of incorrect scheduling information, thus maintaining reliability while enabling efficient scheduling when packets are complete.
Solution Approach 2:
The system implements feedback mechanism where the eNB monitors the continuity of received data packets and adjusts DSI generation accordingly. When discontinuity is detected, the eNB refrains from generating DSI, providing feedback control that maintains system reliability under packet loss conditions.
2Speed
If the eNB generates DSI for all received data packets, then the data transmission speed is improved, but the accuracy of data reception deteriorates when consecutive packets are lost
Solution Approach 1:
The eNB performs preliminary verification of data packet continuity before initiating DSI generation and data transmission. This preliminary action ensures that only complete data sets are scheduled, maintaining reception accuracy while enabling fast transmission when conditions are met.
Solution Approach 2:
The system dynamically adjusts DSI generation based on real-time detection of data packet continuity. When packets are continuous, the system operates at high speed with normal DSI generation; when discontinuity is detected, the system automatically pauses DSI generation, creating a dynamic response that balances speed and accuracy.
3Device complexity
If the eNB transmits DSI without verifying data packet continuity, then the system complexity is reduced, but the harmful interference to other eNBs increases
Solution Approach 1:
The eNB performs a simple preliminary check on data packet continuity before DSI transmission. This minimal additional complexity prevents generation of incorrect DSI that would cause interference to other eNBs, effectively eliminating the harmful factor with negligible system complexity increase.
Solution Approach 2:
The system converts the potential harm of transmitting incorrect DSI under packet loss conditions into a beneficial detection mechanism. By checking packet continuity, the system identifies and prevents interference scenarios, turning a vulnerability into a protective feature that benefits the overall network.
Data Source
AI summary
A subframe processing method and device are disclosed. The subframe processing method includes: if data packets that are not received by an evolved NodeB (eNB) include at least two consecutive Multimedia Broadcast Multicast Service (MBMS) data packets to be scheduled in a Dynamic Schedule Period (DSP) by the eNB, setting a subframe of the eNB that is used to transmit Dynamic Schedule Information (DSI) corresponding to the DSP to null. When the eNB finds that consecutive MBMS data packets are lost and/or that a type 0 Protocol Data Unit (PDU) group is lost, a subframe used to transmit the DSI may be set to null, thereby preventing the eNB from transmitting incorrect DSI which may interfere with other eNBs and cause incorrect data receiving of a user equipment (UE).