TDD Uplink Signal Distribution for Transport Network Overload
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Solution Overview
Problem
In wireless communication networks using Time Division Duplex (TDD), the transport network often becomes overloaded with signals, leading to packet loss and increased radio resource consumption due to the simultaneous arrival of uplink signals, which can result in delayed and poor service performance.
Innovation Solution
Implementing a method where signals received during uplink subframes are distributed over a selected sending time interval of at least a subframe, rather than being sent at line rate, to avoid peak loads on the transport network, thereby reducing packet loss and improving network handling capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If uplink signals are sent to the transport network at line rate, then the network handling capacity is maximized, but the transport network becomes overloaded leading to packet loss
Solution Approach 1:
The patent applies periodic action by distributing uplink signals over multiple sending time intervals instead of transmitting all signals simultaneously at line rate. The network node divides the transmission into periodic bursts separated by intermediate time intervals, allowing the transport network to process signals without overload while maintaining high utilization of network resources
Solution Approach 2:
The patent segments the uplink signals into different groups that are transmitted in separate sending time intervals. By dividing the signal transmission into multiple segments rather than a single continuous stream, the system avoids overwhelming the transport network with simultaneous signals while ensuring all signals are eventually delivered reliably
2Reliability
If signals are distributed over a sending time interval, then packet loss is reduced, but the transmission time increases
Solution Approach 1:
The patent employs dynamics by adaptively selecting the length of sending time intervals based on network conditions and traffic characteristics. The system dynamically adjusts the distribution pattern to balance reliability improvement against transmission time penalty, using shorter intervals when possible to minimize delay while still preventing packet loss through distributed transmission
3Productivity
If uplink and downlink signals are transmitted on the same frequency band, then spectrum efficiency is improved, but interference occurs when transmitted at the same time
Solution Approach 1:
The patent applies periodic action through TDD configuration where uplink and downlink transmissions are separated in time within the same frequency band. By periodically alternating between uplink and downlink subframes with guard periods, the system achieves spectrum efficiency of using the same band for both directions while preventing interference through temporal separation
Data Source
AI summary
There is disclosed a method and a network node for handling signals transmitted from one or more wireless devices in a wireless network when Time Division Duplex (TDD) is employed such that two successive uplink subframes of a radio frame are separated by an intermediary time interval. The signals are received during a subframe reserved for uplink transmissions, and a sending time interval with a length of at least a subframe is selected. Then, the received signals are sent to a transport network such that the signals are distributed over the selected sending time interval instead of being sent virtually at the same time as in conventional procedures. Thereby, the signals will be distributed over a longer time when arriving at the transport network which will have time to handle the signals properly such that any loss of packets can be avoided or at least reduced.