Handling Reserved Stop MTCH Values in LTE DSI MAC Control Elements
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Solution Overview
Problem
Current LTE network standards do not specify how to handle Dynamic Scheduling Information (DSI) MAC control elements with reserved Stop Multicast Traffic Channel (MTCH) values, leading to potential UE malfunction, power consumption issues, or loss of MBMS data when receiving such elements.
Innovation Solution
A method for User Equipment (UE) to handle DSI MAC control elements with reserved Stop MTCH values by either ignoring the Stop MTCH field, treating the reserved value as indicating an unscheduled MTCH, or receiving all MBSFN subframes until the MTCH is completely received, thereby preventing discarding of the MAC PDU and ensuring proper MBMS data handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE discards the MAC PDU when receiving a DSI MAC control element with a reserved Stop MTCH value, then the UE avoids malfunction, but the UE loses MBMS data and may consume excessive power
Solution Approach 1:
The patent extracts the problematic Stop MTCH field from the DSI MAC control element and handles it separately. When a reserved value is detected in the Stop MTCH field, the UE extracts and processes only the relevant portion of the MAC PDU while discarding the problematic field, rather than discarding the entire MAC PDU. This allows the UE to retain useful MBMS data while avoiding malfunction caused by the reserved value.
Solution Approach 2:
The patent changes the interpretation parameter of the Stop MTCH field from 'discard entire PDU' to 'continue processing'. By modifying how the reserved value is interpreted and handled, the UE can maintain reliable operation while preserving the MBMS data transmission, thus resolving the contradiction between reliability and information loss.
2Reliability
If the UE discards the MAC PDU when receiving a DSI MAC control element with a reserved Stop MTCH value, then the UE avoids malfunction, but the power consumption increases
Solution Approach 1:
The patent extracts and handles only the problematic Stop MTCH field rather than discarding the entire MAC PDU. This selective extraction allows the UE to avoid malfunction caused by the reserved value while maintaining power-efficient continuous reception of MBMS data, preventing the excessive power consumption that would result from repeated discarding and reprocessing.
Solution Approach 2:
By changing the handling parameter from 'discard and reprocess' to 'continue processing', the patent reduces the number of times the UE must reprocess data, thereby reducing power consumption while maintaining reliable operation.
3Reliability
If the UE discards the MAC PDU when receiving a DSI MAC control element with a reserved Stop MTCH value, then the UE avoids malfunction, but the complexity of handling increases
Solution Approach 1:
The patent extracts the problematic Stop MTCH field handling logic as a separate, focused procedure. Rather than implementing complex overall PDU discarding logic, the UE applies a specific extraction rule only when encountering reserved values in the Stop MTCH field, simplifying the overall MAC layer handling complexity while ensuring reliable operation.
Data Source
AI summary
A method of handling by a UE a Dynamic Scheduling information (DSI) Medium Control Access MAC control element containing a Stop MTCH field having a reserved value includes ignoring the Stop MTCH field, treating the Stop MTCH field having the reserved value to mean that the corresponding MTCH is not scheduled, or receiving all Multimedia Broadcast multicast service Single Frequency Network (MBSFN) subframes corresponding to the DSI MAC control element during a scheduling period associated with the DSI MAC control element until the MTCH is completely received.