Subband PMCH Allocation for Low Complexity UE MBMS
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Solution Overview
Problem
Current wireless communication systems face challenges in providing efficient multimedia broadcast multicast services (MBMS) for low complexity user equipment (UE) in LTE networks, particularly in reducing hardware complexity and battery consumption while supporting smaller bandwidths, which is essential for machine-type communication (MTC) devices.
Innovation Solution
The method involves supporting MBMS for low complexity UE by allocating a subband physical multicast channel (PMCH) with a physical downlink shared channel (PDSCH) in a subframe, using repetition and power boosting for coverage enhancement, and configuring MBMS services in a subband that can be readable by low complexity UE, allowing for reduced hardware complexity and efficient data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If MBMS service is provided using full system bandwidth, then service quality is improved, but hardware complexity and cost increase for low complexity UE
Solution Approach 1:
The system bandwidth is segmented into multiple subbands, and MBMS service is provided using only a subset of these subbands (e.g., 1.4 MHz, 3 MHz, or 5 MHz) rather than the full system bandwidth. This allows low complexity UE to receive MBMS service with reduced hardware requirements while full-bandwidth UE can utilize all subbands for higher quality service.
2Reliability
If repetition is used for coverage enhancement, then coverage level is improved, but transmission time increases
Solution Approach 1:
The patent implements periodic repetition of MBMS transmissions at configured intervals (e.g., every 2, 4, 8, or 16 radio frames). This periodic repetition provides coverage enhancement for cell-edge users while maintaining efficient resource utilization by not continuously repeating transmissions.
3Reliability
If power boosting is applied to MBMS, then coverage enhancement is achieved, but available power for other services reduces
Solution Approach 1:
The available transmission power is segmented and allocated specifically to subbands carrying MBMS service, rather than uniformly across the entire system bandwidth. This power segmentation allows targeted power boosting for MBMS to enhance coverage while preserving sufficient power for other cellular services.
4Device complexity
If subband PMCH is allocated for low complexity UE, then hardware cost is reduced, but service coverage area decreases
Solution Approach 1:
The subband PMCH allocations are configured with periodic repetition to provide coverage enhancement. By repeating the MBMS transmissions in the allocated subbands over multiple radio frames, the effective coverage area is extended to reach cell-edge users while maintaining reduced bandwidth allocation for low complexity UE.
Data Source
AI summary
A method and apparatus for providing a multimedia broadcast multicast service (MBMS) service for a low-complexity user equipment (UE) in a wireless communication system is provided. In one embodiment, a UE requiring coverage enhancement receives information on repetition for coverage enhancement, and receives the MBMS service according to the information repetition for coverage enhancement.