MBMS Reception Mode Selection via Coverage Enhancement Level Comparison
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing multimedia broadcast multicast service (MBMS) reception methods in E-UTRAN, such as MBSFN and SC-PTM transmissions, are not always efficient due to varying data transmission environments, leading to suboptimal reception efficiency for user equipment (UE).
Innovation Solution
A method for determining the coverage enhancement (CE) level of UE and comparing it with the CE level information of the MBMS service to decide whether to receive the service via MBSFN or SC-PTM transmission, with the option to request unicast transmission if the CE level is insufficient, and predicting the repetition transmission count to make similar decisions based on transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE receives MBMS service via MBSFN transmission, then resource efficiency is improved, but reception reliability deteriorates in poor channel conditions
Solution Approach 1:
The patent implements dynamic selection between MBSFN and SC-PTM transmission modes based on real-time channel conditions. The UE determines its coverage enhancement level and compares it with the service's CE level to dynamically decide the reception mode, allowing the system to adapt to varying channel conditions and optimize both resource efficiency and reception reliability.
Solution Approach 2:
The patent changes the transmission mode parameter based on coverage enhancement levels. By comparing the UE's CE level with the service's CE level, the system selects appropriate transmission parameters (MBSFN for better conditions, SC-PTM or unicast for poorer conditions), thereby resolving the contradiction between resource efficiency and reception reliability.
2Reliability
If the UE receives MBMS service via SC-PTM transmission, then reception reliability is improved, but resource efficiency deteriorates
Solution Approach 1:
The system dynamically switches between SC-PTM and unicast transmission modes based on channel conditions. When the UE's CE level exceeds the service's CE level, indicating poor channel conditions, the UE requests unicast transmission to ensure reliable reception, while accepting the trade-off of reduced resource efficiency.
Solution Approach 2:
The transmission mode parameter is changed from SC-PTM to unicast when coverage enhancement requirements are not met. This parameter change ensures reception reliability by using dedicated resources for the specific UE, though at the cost of reduced overall resource efficiency.
3Reliability
If the UE requests unicast transmission, then reception reliability is improved, but system capacity deteriorates
Solution Approach 1:
The patent applies unicast transmission only partially - specifically when the UE's CE level exceeds the service's CE level. This partial application of unicast ensures reliable reception for UEs in poor conditions while maintaining multicast efficiency for UEs in good conditions, thus balancing reception reliability with system capacity.
Solution Approach 2:
Different transmission modes are applied to different UEs based on their local channel conditions. UEs with poor channel conditions (high CE level) receive unicast transmission for reliable delivery, while UEs with good conditions receive multicast transmission, optimizing the balance between individual reception reliability and overall system capacity.
Data Source
AI summary
Disclosed are a method for receiving an MBMS service and a device supporting same. According to an embodiment of the present invention, a method for receiving an MBMS service by a terminal in a wireless communication system comprises the steps of: deciding a coverage enhancement (CE) level of a terminal; receiving CE level information of an MBMS service of interest; comparing the decided CE level of the terminal and the received CE level information of the MBMS service and thus determining whether or not the MBMS service can be received by means of MBSFN transmission or SC-PTM transmission; and receiving the MBMS service on the basis of the determination result.