Communication Device Time Zone Switching for Packet Collision Reduction
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Solution Overview
Problem
In mobile communication systems using the WAVE standard, overlap areas between service provision devices can lead to packet collisions on the control channel, causing important data to be missed by in-mobile devices due to shared communication resources and differing service priorities.
Innovation Solution
A communication device with a time holder section, time zone determiner section, CCH transmission processor section, data generator section, and importance determiner section that alternates between control channel (CCH) and service channel (SCH) time zones based on data importance, ensuring high-importance data is transmitted during CCH time zones and low-importance data during SCH time zones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple service provision devices share the control channel in overlap areas, then service coverage is improved, but packet collision probability increases
Solution Approach 1:
The patent implements periodic time zone switching between CCH and SCH with fixed intervals (e.g., 50 milliseconds each). Service provision devices transmit WSAs periodically during their designated CCH time zones, creating a rhythmic transmission pattern that prevents simultaneous transmissions in overlap areas, thereby reducing packet collisions while maintaining broad service coverage.
Solution Approach 2:
The patent divides the shared control channel into separate time segments (CCH time zones) assigned to different service provision devices. Each device operates in its own time slot within the overlap area, segmenting the previously concurrent transmissions into sequential ones. This segmentation eliminates packet collisions while preserving the ability to serve multiple devices across the same geographic area.
2Reliability
If all data is transmitted during CCH time zones, then data importance is preserved, but communication efficiency deteriorates
Solution Approach 1:
The patent applies different transmission channels based on data characteristics: high-importance data (WSAs) use the CCH during designated time zones, while low-importance data (service communications) use the SCH. This local quality differentiation ensures that critical data receives the reliability of CCH transmission while routine data utilizes the higher efficiency of SCH, optimizing overall system performance.
Solution Approach 2:
The patent transmits only essential high-importance data during CCH time zones rather than all possible data. By limiting CCH usage to WSAs and other critical information, the system maintains data reliability for important transmissions while avoiding the inefficiency of using the limited CCH resources for all communication needs. Low-importance data is handled partially through SCH channels.
3Loss of information
If CCH time zone duration is extended, then data transmission completeness is improved, but channel congestion worsens
Solution Approach 1:
The patent employs periodic CCH time zones with fixed, relatively short durations (e.g., 50 milliseconds) repeated at regular intervals. This periodic structure allows devices to transmit essential WSAs quickly during each CCH window, ensuring transmission completeness for time-critical data while limiting the total time any single device occupies the channel, thereby preventing prolonged congestion.
Solution Approach 2:
The patent requires service provision devices to prepare and queue WSAs for transmission before CCH time zones begin. Devices perform preliminary actions to ensure all high-importance data is ready for immediate transmission when the CCH window opens, enabling complete transmission of necessary information within the short allotted time without extending the CCH duration or creating congestion.
Data Source
AI summary
A communication device is used in a mobile communication system switching alternately two communication time zones of a control channel (CCH) time zone in which communication using a control channel (CCH) is performed and a service channel time zone in which communication using a service channel is performed. A CCH transmission processor section transmits data using the control channel. When a generated data by a data generator section is determined by an importance determiner section to be equivalent to a data having a high-importance level, the generated data is transmitted in the CCH time zone by the CCH transmission processor section. By contrast, when the generated data is determined to be equivalent to a data having a low-importance level, the generated data is transmitted in the SCH time zone by the CCH transmission processor section.