Semi-Persistent Scheduling in MBSFN Subframes
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Solution Overview
Problem
Existing higher-layer protocols do not support semi-persistent scheduling transmission in MBSFN sub-frames, preventing its implementation in Multimedia Broadcast/Multicast Service (MBMS) systems.
Innovation Solution
The method involves a User Equipment (UE) attempting to receive semi-persistent scheduling transmission data in MBSFN sub-frames, with error handling mechanisms to trigger retransmissions or indicate resource conflicts, allowing correct semi-persistent scheduling by distinguishing between MBMS and unicast service data, and the eNB dynamically reassigning resources to avoid collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If semi-persistent scheduling is implemented in MBSFN sub-frames, then spectrum utilization ratio is improved, but resource collision between unicast and multicast services occurs
Solution Approach 1:
The patent implements feedback mechanisms where the UE sends HARQ acknowledgments for SPS transmissions in MBSFN sub-frames, and the eNB adjusts scheduling based on this feedback. The network monitors decoding success and dynamically manages resource allocation to prevent collisions between unicast SPS and multicast MBMS transmissions.
Solution Approach 2:
The patent introduces dynamic resource management where the eNB can reassign SPS resources when MBMS transmission is detected in a configured MBSFN sub-frame. The system dynamically switches between static SPS allocation and dynamic scheduling based on real-time MBMS activity, allowing flexible adaptation to prevent resource conflicts.
2Area of stationary object
If MBSFN sub-frames are used for SPS transmission, then coverage ratio is improved, but decoding reliability deteriorates due to resource conflicts
Solution Approach 1:
The patent configures SPS parameters including periodicity, sub-frame offset, and resource allocation in advance before transmission begins. The eNB pre-configures the UE with SPS-RNTI and transmission parameters, allowing the UE to prepare for reception in MBSFN sub-frames. This preliminary configuration enables reliable decoding by establishing resource patterns before potential conflicts arise.
Solution Approach 2:
The patent introduces an intermediary detection mechanism where the eNB monitors MBMS transmission status in MBSFN sub-frames and acts as a mediator to resolve potential conflicts. When MBMS transmission is detected, the eNB intervenes by releasing or reassigning SPS resources, preventing direct conflict between unicast and multicast transmissions and maintaining decoding reliability.
3Ease of operation
If SPS resources are statically allocated in MBSFN sub-frames, then transmission scheduling is simplified, but resource flexibility is reduced when MBMS transmission is required
Solution Approach 1:
The patent implements a hybrid approach where SPS resources are initially configured statically for simplicity, but the system dynamically releases or reassigns these resources when MBMS transmission is detected in the configured MBSFN sub-frames. This dynamic adjustment mechanism maintains ease of operation for normal SPS while providing adaptability when multicast services require the resources.
Solution Approach 2:
The patent changes scheduling parameters dynamically based on service type. When MBMS transmission is required in a configured MBSFN sub-frame, the system modifies the SPS configuration parameters (releasing or reassigning resources) rather than maintaining fixed static allocation. This parameter change approach balances simplification with adaptability.
Data Source
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AI summary
Disclosed are a method and apparatus for semi-persistent scheduling (SPS) transmission, used to transmit the SPS via a Multimedia Broadcast multicast service Single Frequency Network (MBSFN) subframe. A method provided in the present application for implementing an SPS transmission comprises: a user equipment (UE) determining an MBSFN subframe; the UE receiving an SPS transmission data packet in the MBSFN subframe.