MBMS Feedback Resource Allocation in Idle Mode
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Solution Overview
Problem
In the context of SCPTM transmission in EUTRA, mobile stations in idle or connected modes may not receive optimal MBMS service due to inadequate uplink feedback resources and inefficient selection of mobile stations based on downlink channel conditions, leading to suboptimal MCS values and increased uplink feedback resource usage.
Innovation Solution
A communication technique where mobile stations transmit MBMS requests or Measurement Reports to the base station under specific conditions, such as poor channel quality or inability to receive MBMS service, triggering feedback resource assignment and enabling the base station to adjust transmission types based on received feedback information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mobile stations continuously transmit feedback information, then the base station can optimize transmission parameters, but uplink feedback resource consumption increases
Solution Approach 1:
The patent implements a feedback mechanism where mobile stations transmit CQI information to the base station, which then adjusts MCS values for MBMS transmission. The feedback is triggered by specific conditions (channel quality degradation, PDCCH/PDSCH reception failures) rather than continuous transmission, optimizing the balance between service quality and resource consumption.
Solution Approach 2:
The patent employs periodic feedback transmission based on trigger conditions rather than continuous feedback. Mobile stations monitor channel conditions and transmit feedback only when specific events occur (e.g., channel quality falls below threshold, reception failures detected), reducing uplink resource usage while maintaining service quality.
2Device complexity
If the base station uses fixed MCS values for MBMS transmission, then transmission simplicity is maintained, but service quality for mobile stations with varying channel conditions deteriorates
Solution Approach 1:
The patent introduces dynamic MCS adjustment for MBMS transmission based on feedback from mobile stations. The base station modifies MCS values in response to channel condition changes detected through feedback triggers, enabling adaptive transmission that maintains service quality across varying channel conditions while preserving relative transmission simplicity.
Solution Approach 2:
The patent changes the MCS parameter dynamically based on feedback information from mobile stations. When channel conditions deteriorate or reception failures occur, the base station adjusts MCS values to match current channel quality, optimizing service reception while maintaining manageable transmission control complexity.
3Device complexity
If mobile stations in idle mode receive MBMS service without feedback resources, then resource allocation simplicity is maintained, but service optimization capability is lost
Solution Approach 1:
The patent enables mobile stations in idle mode to self-identify when service optimization is needed by monitoring their own reception status. When detection failures occur or channel quality degrades, mobile stations autonomously trigger feedback transmission to request optimized service parameters, eliminating the need for complex base station-side resource management while maintaining optimization capability.
Data Source
AI summary
In an MBMS service desired to be received, if a condition for performing an MBMS request (an MBMS request trigger criterion) is satisfied (S3: YES), a mobile station 20a in an idle mode (RRC_IDLE) enters an MBMS request transmission process, transmits a preamble to a base station 10b, receives a random access response including scheduling information for transmitting a Message 3 and the like from the base station 10b, and transmits the Message 3 including an RRC Connection Request (including an NAS ID of the mobile station itself), the MBMS request and channel quality information to the base station 10b (S4), and if an Message 4, which includes RRC Connection Setup that is destined for the mobile station itself and includes the NAS ID, and which includes feedback resource assignment information, is received from the base station 10b (S5: YES), the mobile station 20a transits to a connected mode (RRC_CONNECTED), and also uses the designated resource to provide feedback to the base station (S6). Thereby, the MBMS service can be efficiently provided via SCPTM transmission.