Base Station Polling Timer for Wireless Communication
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Solution Overview
Problem
In 5G communication systems, the non-time critical processing structure faces inefficiencies due to unnecessary retransmissions of RLC PDUs, particularly caused by congestion between the central unit (CU) and distributed unit (DU) in the fronthaul interface, leading to increased latency and resource wastage.
Innovation Solution
Implementing a periodic timer-based polling function that sets a polling period for the transmission of poll bits, allowing the base station to transmit packets with a poll bit set regardless of the number of packets or their size, and dynamically adjusting the polling timer based on the round trip time (RTT) between the CU and DU to optimize resource use and reduce unnecessary retransmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station continuously monitors and retransmits RLC PDUs to ensure reliable delivery, then packet transmission reliability is improved, but air resource efficiency deteriorates due to unnecessary retransmissions
Solution Approach 1:
The patent implements periodic polling where the base station transmits poll bits at predetermined intervals rather than continuously monitoring every packet. The RLC entity sends status reports periodically based on these poll bits, transforming continuous monitoring into periodic action. This reduces the frequency of status report transmissions and eliminates unnecessary retransmissions while maintaining reliable packet delivery through timed checks.
2Reliability
If the polling period is set short to detect packet loss quickly, then transmission reliability is improved, but latency increases due to frequent status report handling
Solution Approach 1:
The patent dynamically adjusts the polling period parameter based on network conditions and traffic patterns. By changing the time interval between poll bit transmissions, the system can extend the polling period during low-traffic conditions to reduce latency, while maintaining shorter periods when reliability is critical. This parameter adjustment optimizes the balance between quick packet loss detection and minimizing status report processing delays.
3Reliability
If the base station transmits poll bits for every packet to ensure acknowledgment, then transmission reliability is improved, but device complexity increases due to continuous polling management
Solution Approach 1:
The patent extracts the polling function from individual packet transmission and implements it as a separate, periodic control mechanism. Instead of embedding polling logic in every packet handling routine, the system uses dedicated poll bit transmission at periodic intervals and separate status report processing. This extraction simplifies the overall system architecture by separating acknowledgment requests from data transmission flows, reducing the complexity of polling management while maintaining reliable packet acknowledgment.
Data Source
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AI summary
The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4th-Generation (4G) communication system such as Long Term Evolution (LTE). The communication method of a base station in a wireless communication system, according to one embodiment of the disclosure, can comprise the steps of: setting a transmission period of a poll bit for indicating the transmission of information on whether a packet has been successfully received; generating a packet including the poll bit set on the basis of the transmission period; and transmitting the generated packet to a terminal.