MBSFN Frame Identification via Repetition Period and Offset
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Solution Overview
Problem
Current methods for configuring multicast/broadcast over single frequency network (MBSFN) frames in LTE systems are inefficient, leading to wastage of system resources due to excessive byte occupation in system messages.
Innovation Solution
A method where a mobile terminal identifies MBSFN frames using configuration parameters that include a repetition period and an optional offset, allowing the terminal to determine if a wireless frame is an MBSFN frame through the formula SFN mod MBSFN_rep = MBSFN_offset, thereby reducing the number of bytes required in system messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a bitmap mode is adopted to indicate MBSFN frames, then the terminal can accurately identify MBSFN frames, but the number of bytes occupied in system messages increases excessively
Solution Approach 1:
The patent changes the parameter representation from a bitmap (M bits for M wireless frames) to a mathematical formula based on repetition period and offset. This transforms the data structure from explicit bit-by-bit indication to compact parameter-based calculation, significantly reducing the number of bytes needed while maintaining the ability to accurately identify MBSFN frames through the formula SFN mod MBSFN_rep = MBSFN_offset
Solution Approach 2:
The patent segments the MBSFN frame indication into two independent parameters: repetition period (MBSFN_rep) and offset (MBSFN_offset). This segmentation allows the system to represent frame types using minimal bits for each parameter rather than using a contiguous bitmap, achieving compression while preserving identification accuracy
2Reliability
If detailed configuration information is provided for each wireless frame, then the terminal can perform accurate channel estimation, but system resources are wasted due to excessive message size
Solution Approach 1:
The patent enables the terminal to self-determine MBSFN frame types by applying the mathematical formula using parameters received from the network. Instead of the network transmitting detailed configuration for each frame, the terminal uses the repetition period and offset parameters to calculate and identify MBSFN frames independently, reducing network overhead while maintaining estimation reliability
Solution Approach 2:
The patent performs preliminary configuration by providing the terminal with the repetition period and offset parameters in advance. The terminal then uses these pre-provided parameters to determine MBSFN frame types for subsequent operations, eliminating the need for repeated detailed transmission of frame configuration information
Data Source
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AI summary
A configuration method and an indication method of MBSFN frames and an identifying method used by a terminal applied in a long term evolution system are disclosed in the present invention, which include: an access network sends configuration parameters of the MBSFN frame to a mobile terminal determining whether the wireless frame received is an MBSFN frame according to the configuration parameters, the configuration parameters including a repetition period of the MBSFN frames distributed in system-set time. With the present invention, it could consume less bytes in system message to complete the configuration of the MBSFN sub-frames and could save system resources.