Broadcast Channel SFN Bit Segmentation for Mobile System Information
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Solution Overview
Problem
The existing mobile communication systems, such as UMTS and LTE, face limitations in transmitting sufficient system information bits over a broadcast channel due to bandwidth constraints, making it impossible to transmit all necessary information effectively.
Innovation Solution
The method involves encoding and transmitting system frame number (SFN) bits in a way that first partial bits remain constant across successive radio frames, while second partial bits change, allowing for more information to be conveyed within a predetermined bandwidth by using a broadcast channel, enabling the UE to receive and decode these bits efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If system information is transmitted using conventional broadcast channels in UMTS/LTE, then the transmission can be performed with existing infrastructure, but the bandwidth is insufficient to transmit all necessary system information bits
Solution Approach 1:
The system frame number (SFN) is segmented into first partial bits and second partial bits. The first partial bits are transmitted on the broadcast channel along with system information, while the second partial bits are transmitted separately. This segmentation allows the broadcast channel to convey more information bits within its bandwidth constraints by splitting the SFN transmission across multiple channels.
2Reliability
If the broadcast channel uses predetermined bandwidth for transmission, then the transmission resources are fixed and manageable, but the channel cannot convey sufficient system information to cell boundary UEs
Solution Approach 1:
The first partial bits of the SFN act as an intermediary element that is transmitted on the broadcast channel alongside system information. This intermediary component enables the broadcast channel to carry additional information without requiring increased bandwidth, thereby improving the reliability of information delivery to cell boundary UEs while maintaining the predetermined bandwidth allocation.
3Loss of information
If all SFN bits are transmitted on the broadcast channel, then the information is complete, but the bandwidth requirements exceed the available broadcast channel capacity
Solution Approach 1:
The SFN is divided into first partial bits and second partial bits. The first partial bits are transmitted on the broadcast channel with system information, while the second partial bits are transmitted through separate signaling. This segmentation ensures information completeness is maintained while adhering to the bandwidth constraints of the broadcast channel.
Solution Approach 2:
The solution moves from a single-dimension approach (transmitting all SFN bits on one channel) to a multi-dimensional approach by transmitting different SFN bit portions across multiple channels (broadcast channel and separate signaling channels). This dimensional expansion allows complete information transmission without exceeding any single channel's bandwidth capacity.
Data Source
AI summary
Methods and apparatuses are provided for transmitting and receiving system information (SI). A method for receiving SI by a user equipment (UE) in a mobile communication system includes receiving, by the UE, the SI including first partial bits of a system frame number (SFN) without second partial bits of the SFN on a broadcast channel (BCH) at a first subframe of a radio frame, the first partial bits of the SFN having the same value during a predetermined N successive radio frames of a BCH transmission period, where N is a positive integer; and acquiring, by the UE, the second partial bits of the SFN for the radio frame, the second partial bits of the SFN having different values in different radio frames of the predetermined N successive radio frames of the BCH transmission period.