Dynamic MBSFN Subframe Allocation for MBMS Data Burst Handling
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Solution Overview
Problem
In LTE systems, MBMS group services face congestion issues due to bursty data transmission, leading to packet loss and inefficient use of radio resources, as existing methods require pre-allocation of multiple MBSFN subframes, resulting in idle resources when no burst occurs.
Innovation Solution
A method where the base station sends group service data within one multicast channel scheduling period on an MBSFN subframe and instructs user equipment to receive remaining data on other subframes, such as unicast or MBSFN subframes, when the initial subframe cannot accommodate all data, optimizing resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If more MBSFN subframes are pre-allocated to an MCH that carries the Group service, then a larger amount of data can be accommodated and packet loss is reduced, but a large quantity of MBSFN subframes are idle when no data burst occurs, causing waste of radio resources
Solution Approach 1:
The patent applies dynamic scheduling by allowing the eNB to flexibly allocate MBSFN subframes based on actual data burst conditions. When a data burst occurs, the eNB dynamically assigns additional subframes from the available pool to the MCH, ensuring packets are transmitted without loss. When no data burst occurs, the eNB reassigns these subframes to other services or leaves them idle without causing resource waste, thus adapting to varying traffic conditions optimally
Solution Approach 2:
The patent changes the parameter of subframe allocation from a fixed pre-allocated configuration to a dynamic parameter adjustment mechanism. By modifying the allocation strategy based on actual data transmission needs (changing the parameter from static to dynamic), the system can accommodate data bursts when necessary while avoiding unnecessary resource consumption during normal operation, resolving the contradiction between reliability and resource efficiency
2Quantity of substance
If more MBSFN subframes are pre-allocated to an MCH that carries the Group service, then a larger amount of data can be accommodated, but when no data burst occurs, the eNB cannot use the remaining MBSFN subframes for scheduling UE in transmission mode 9/10, causing waste of radio resources
Solution Approach 1:
The patent implements multi-functionality by allowing MBSFN subframes to serve multiple purposes: they can be allocated to Group services when data bursts occur, or reassigned to unicast transmissions for UE in transmission mode 9/10 when no data burst is present. This flexible reassignment strategy ensures that subframes are not wasted but rather utilized for alternative services, thereby improving the adaptability and versatility of the radio resource allocation system
3Device complexity
If existing multicast channel MCH multiplexing manner is used, then the system structure is simple, but a probability of congestion is obviously increased when Group service data bursts occur
Solution Approach 1:
The patent applies segmentation by dividing the MBSFN subframe pool into multiple allocatable units that can be dynamically distributed. Instead of a monolithic allocation system, the subframes are segmented into individual time slots that can be independently assigned to different services based on actual demand. This segmentation enables finer-grained control over resource allocation, reducing congestion probability while maintaining manageable system complexity
Data Source
AI summary
According to a method for transmitting MBMS group service data, a base station sends group service data to the UE within one MSP on an MBSFN subframe corresponding to an MCH; when the base station cannot completely send the group service data on the MBSFN subframe that is corresponding to the MCH and that is within the MSP, the base station sends, on one or more other subframes except the MBSFN subframe corresponding to the MCH, remaining group service data that cannot be sent on the MBSFN subframe corresponding to the MCH; and the base station instructs the UE to receive the remaining data on the one or more other subframes. The embodiments of the present invention are used for transmitting MBMS group service data.