Uplink Access Delay Distribution for Signalling Overload Control
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Solution Overview
Problem
Current radio communication systems face signalling overload issues in contention-based uplink access channels, particularly when a large number of user equipment respond simultaneously, which can disrupt network operations during services like MBMS, as existing delay distributions are inefficient in managing simultaneous access attempts.
Innovation Solution
A method where user equipment determines an initial delay time for uplink access channel transmissions using a probability distribution that increases in density with time, allowing the network to control and terminate responses when a threshold is reached, thereby reducing the likelihood of collisions and overload.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If user equipments respond simultaneously on contention-based uplink access channel, then the network can quickly count the number of responses, but signalling overload occurs disrupting network operation
Solution Approach 1:
The patent implements periodic action by dividing the response time into discrete time slots or intervals. User equipments are distributed across different time slots based on a probability distribution, transforming simultaneous responses into sequential periodic transmissions. This resolves the contradiction by maintaining fast counting (through structured time intervals) while preventing overload (by spacing transmissions across periods).
Solution Approach 2:
The patent changes the parameter of transmission timing by introducing a probability distribution function that determines when user equipments transmit responses. Instead of uniform or random timing, the distribution parameter is optimized to increase the likelihood of responses occurring at different times. This parameter change enables fast counting while distributing load to prevent signalling overload.
2Ease of operation
If uniform or negative exponential delay distribution is used, then individual user equipment access is efficient, but simultaneous access attempts from large numbers of user equipments cause signalling overload
Solution Approach 1:
The patent applies local quality by making the delay distribution characteristic different for different user equipments. Instead of all user equipments using the same uniform or negative exponential distribution, each user equipment independently selects a delay based on a probability distribution function. This local differentiation ensures that while individual access remains simple, the aggregate effect distributes responses across time, preventing overload from large numbers of simultaneous responses.
3Adaptability or versatility
If a large number of user equipments are paged simultaneously for MBMS service establishment, then group service provisioning is enabled, but contention-based access channel becomes overloaded
Solution Approach 1:
The patent introduces dynamics by making the delay distribution adaptive rather than static. The probability distribution function allows the system to dynamically adjust response timing characteristics based on the number of user equipments being paged. This dynamic approach enables group service provisioning for any number of user equipments while automatically preventing overload by distributing responses across time according to the adaptive distribution.
Data Source
AI summary
According to a first aspect, there is provided a method for controlling uplink access transmissions in a radio communication system, wherein a user equipment determines a delay time for transmitting a signal on an uplink access channel, wherein the delay time is randomly determined based upon a probability distribution that increases in density with increasing delay. According to a second aspect, there is provided a method for controlling uplink access transmissions in a radio communication system, wherein from a base station of the radio communication system, time variable information is signalled in downlink to user equipments located in an area covered by the base station, wherein the information is used to determine delay times for transmitting signals on an uplink access channel and wherein the information varies based upon a probability distribution which increases in density with increasing time.