System Frame Number Segmentation to Reduce Time-Frequency Overhead
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Solution Overview
Problem
Current communications systems face high system overheads due to the need to transmit a large number of bits for system frame numbers, particularly in scenarios like LTE, which require significant time-frequency resources for security key updates.
Innovation Solution
A method that uses partial identification information in multiple time units to indicate the system frame number, reducing the number of bits transmitted by dividing the frame number into subparts and using different scrambling codes or encoding schemes for each unit, allowing the receiver to reconstruct the full frame number.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the system frame number is transmitted using a large number of bits to support a long security key update cycle, then the maximum frame number that the system can support is increased, but the time-frequency resources required for transmission and system overheads are significantly increased
Solution Approach 1:
The patent segments the system frame number into multiple parts and transmits them at different time points. Specifically, the first part of the system frame number is transmitted in the MIB, while the second part is transmitted in subsequent system information blocks. This segmentation allows the system to support a 30-minute security key update cycle (requiring 21-bit frame numbers) without transmitting all 21 bits simultaneously, thereby reducing peak time-frequency resource usage while maintaining the ability to represent large frame number values.
2Reliability
If the system frame number is transmitted using a large number of bits, then the maximum frame number that the system can support is increased, but the system overheads are significantly increased
Solution Approach 1:
The system frame number is divided into multiple segments transmitted at different times. The first segment is included in the MIB, and the second segment is transmitted in later system information blocks. This approach enables the system to support large frame numbers (up to 21 bits for 30-minute security cycles) while reducing system overhead by distributing the transmission burden across multiple time instances rather than requiring all bits to be transmitted simultaneously in a single broadcast.
Solution Approach 2:
The first part of the system frame number is transmitted in advance within the MIB before the complete frame number is needed. This preliminary transmission allows the receiver to start processing earlier and reduces the complexity of transmitting the entire frame number at once, as part of the information is already available from the preliminary MIB transmission.
Data Source
AI summary
This application relates to the field of communications technologies, and discloses a communications method and apparatus. The method includes: determining a number of a target time unit; and sending a plurality of pieces of identification information in a plurality of time units, where the plurality of pieces of identification information are used to indicate the number of the target time unit. Each of the plurality of pieces of identification information includes S bits, and the S bits include at least one first bit and at least one second bit. The at least one second bit included in one of the plurality of pieces of identification information and a combination of the at least one first bit included in the plurality of pieces of identification information are used to indicate the number of the target time unit.