Variable Transport Block Size for MTC Cell-Broadcast Data
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Solution Overview
Problem
In wireless communication systems, particularly in 3GPP LTE, there is a need for efficiently transmitting cell-broadcast data to machine-type communication (MTC) user equipment (UEs) with reduced cost and battery consumption, which is challenging due to the conventional requirement for downlink control information (DCI) and complex radio frequency/baseband components.
Innovation Solution
A method and apparatus that determine and use a variable transport block size (TBS) without associated DCI, allowing for efficient transmission of cell-broadcast data by assigning modulation and coding schemes and adjusting TBS based on aggregation levels, thereby reducing the complexity and power consumption of MTC UEs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional scheduling for cell-broadcast data transmission is used, then data can be transmitted to MTC UEs, but the complexity and power consumption of MTC UEs increase due to requirement for DCI and complex RF/baseband components
Solution Approach 1:
The patent extracts and removes the DCI requirement from the cell-broadcast data transmission process. By pre-configuring resource allocations, MCS, and TBS through system information blocks, the patent eliminates the need for UEs to decode DCI messages, thereby reducing RF/baseband complexity while maintaining reliable data transmission capability.
Solution Approach 2:
The patent applies preliminary action by pre-configuring all necessary transmission parameters (resource allocations, MCS, TBS) through system information blocks before actual data transmission. This allows MTC UEs to directly receive and process cell-broadcast data without needing to decode control information, reducing device complexity while ensuring reliable communication.
2Adaptability or versatility
If conventional scheduling with DCI is used for cell-broadcast data, then transmission can be controlled and adapted, but power consumption of MTC UEs increases due to continuous monitoring and decoding requirements
Solution Approach 1:
The patent removes the continuous DCI monitoring and decoding requirement from the transmission process. By embedding all control information in system information blocks, the patent eliminates the need for UEs to continuously monitor and decode DCI messages, significantly reducing power consumption while maintaining transmission adaptability through pre-configured parameters.
Solution Approach 2:
The patent performs preliminary configuration of all transmission parameters including adaptability controls through system information blocks before data transmission begins. This allows the network to maintain transmission control capability while UEs consume less power by simply receiving pre-configured parameters and data without continuous control channel monitoring.
3Productivity
If variable TBS is supported with associated DCI, then transmission efficiency can be optimized, but the cost and complexity of MTC UEs increase
Solution Approach 1:
The patent extracts the TBS indication from DCI messages and embeds it directly in system information blocks. This allows variable TBS to be supported for optimized transmission efficiency while eliminating the need for complex baseband processing to decode TBS from DCI, thereby reducing UE complexity and cost.
Solution Approach 2:
The patent makes the system information blocks serve multiple functions: carrying both control information and TBS configuration for cell-broadcast data transmission. This universal approach allows variable TBS support and transmission optimization without requiring separate DCI mechanisms, reducing baseband complexity while maintaining productivity.
Data Source
AI summary
A method and apparatus for transmitting cell-broadcast data in a wireless communication system is provided. A base station determines a transport block size (TBS) based on an aggregation level, and transmits the cell-broadcast data to a machine-type communication (MTC) user equipment (UE) by using the TBS. That is, different TBSs may be determined based on different aggregation levels.