Interest Indication Handling in 5G Wireless Communication Systems
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Solution Overview
Problem
Current 5G wireless communication systems face challenges in resource allocation and control channel information transmission for efficient broadcast and multicast services, particularly in managing interest indications for multimedia broadcast multicast services (MBMS), leading to inefficiencies and limitations in resource utilization and coverage.
Innovation Solution
The proposed solution involves optimizing the transmission of interest indications by determining when to send these indications based on changes in service interest and cell state transitions, minimizing redundant signaling and optimizing resource allocation across different radio access network (RAN) areas and technologies, allowing for efficient handling of MBMS in both LTE and 5G NR systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If interest indications are transmitted frequently to ensure service continuity, then service reliability is improved, but signaling overhead increases
Solution Approach 1:
The patent extracts and removes redundant interest indication transmissions by identifying when they are unnecessary (e.g., when UE interest status hasn't changed). This eliminates unnecessary signaling while preserving essential service continuity information.
Solution Approach 2:
The patent applies partial action by transmitting interest indications only when necessary (when service interest changes), rather than continuously or excessively. This reduces signaling overhead while maintaining adequate service reliability.
2Area of stationary object
If interest indications are transmitted in all RAN areas to ensure comprehensive coverage, then service coverage is improved, but resource utilization deteriorates
Solution Approach 1:
The patent applies local quality by transmitting interest indications selectively in specific RAN areas where UEs are actually located or moving toward, rather than uniformly across all RAN areas. This optimizes resource utilization while maintaining appropriate service coverage.
Solution Approach 2:
The patent uses preliminary action by predicting UE movement patterns and proactively managing interest indications in anticipated RAN areas, reducing the need for extensive trial transmissions across all possible areas.
3Loss of information
If interest indications are sent upon every state transition to maintain accuracy, then information accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent implements feedback mechanisms to track UE state transitions and interest status changes, transmitting interest indications only when actual changes occur rather than on every state transition. This maintains information accuracy while reducing redundant signaling.
Solution Approach 2:
The patent applies partial action by selectively transmitting interest indications only for meaningful state transitions that actually affect service interest, rather than transmitting for every possible state change.
Data Source
AI summary
Method and apparatus for a user equipment (UE) operating in a serving cell is disclosed. The UE, in a first RRC_CONNECTED state, transmits an interest indication for a broadcast or a multicast service to a first serving cell. The interest indication includes at least some information associated with a broadcast or a multicast service. Upon entering a second RRC_CONNECTED state from an RRC_INACTIVE state, the UE may or may not send an interest indication to a second serving cell, taking into account the differences between the first and second serving cell, whether the second serving cell requested transmission of an interest indication, or whether the content of the second interest indication would be the same as the content of the first interest indication. A network node may retain UE context and other UE-related information after the UE has left an RRC_CONNECTED state, forward the information to another network node, and/or process the information when the UE re-enters the RRC_CONNECTED state.