MCCH Content Change Notification via PDCCH
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Solution Overview
Problem
In existing radio communication systems, User Equipment (UE) periodically listens to Multimedia Broadcast and Multicast Service (MBMS) point-to-multipoint Control Channels (MCCH), leading to resource waste due to duplicated content and unnecessary listening, as UE cannot detect changes in MCCH content without periodic redirection.
Innovation Solution
A method where a base station determines changes in MCCH content and transmits a notification to UE on the Physical Downlink Control Channel (PDCCH), allowing the UE to redetect the MCCH only when content changes occur, thereby conserving resources by avoiding unnecessary listening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UE periodically listens to MCCH, then UE can receive MBMS control information, but resource waste occurs due to duplicated content and unnecessary listening
Solution Approach 1:
The base station performs preliminary action by determining whether MCCH content has changed before the UE's periodic listening time arrives. When content changes, the base station sends an indication information to the UE in advance, so the UE only needs to listen to MCCH when notified, avoiding periodic listening for unchanged content and reducing resource waste.
2Loss of information
If UE periodically listens to MCCH, then UE can detect content changes, but unnecessary listening occurs when content remains unchanged
Solution Approach 1:
The base station provides feedback to the UE about whether MCCH content has changed by sending indication information. This feedback mechanism allows the UE to adjust its listening behavior - listening to MCCH only when the base station indicates content has changed, and skipping listening when no change occurred, thereby eliminating unnecessary time consumption.
3Ease of operation
If base station transmits indication information on PDCCH, then UE can be notified of MCCH content changes, but additional signaling overhead is introduced
Solution Approach 1:
The base station merges the content change indication function with existing PDCCH signaling by using DCI formats that are already transmitted on PDCCH for other purposes. This combining approach allows the base station to notify UE of MCCH content changes without introducing completely new signaling structures, thereby reducing additional signaling overhead while maintaining ease of operation.
Data Source
AI summary
A method for channel content alternation notification and channel re-detecting is provided. The method is: a base station determines that the configured carried content of multimedia broadcast multicast service (MBMS) point to multipoint control channel (MCCH) is altered, and transmits the notification about alternation of the carried content of MCCH to a terminal through a physical downlink control channel (PDCCH); the terminal re-detects MCCH according to the notification after the terminal received the notification. A system and a device for channel re-detecting are provided. The terminal can recognize whether the carried content of MCCH is altered, and re-detect MCCH in case of altered without re-detecting MCCH periodically, therefore it is beneficial to save the resources of terminal.