5G Base Station TDD Resource Allocation for Mixed Latency Traffic
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional communication systems face difficulties in frequency-multiplexing multiple types of communication with different delay amounts, particularly in 5G systems where uplink and downlink boundaries are set in units of the longest symbol length, making it challenging to accommodate diverse traffic requirements such as low-latency and wide-coverage communications.
Innovation Solution
A communication system that employs a base station to allocate different radio resources, including subcarrier spacings and symbol lengths, for various terminals, using time division duplex (TDD) and orthogonal frequency division multiplexing (OFDM) with self-contained subframes for low-latency traffic and longer symbol lengths for wide-coverage traffic, allowing for efficient frequency multiplexing of communications with varying delay requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uplink and downlink boundaries are set in units of the longest symbol length, then wide coverage is achieved, but low-latency communication becomes difficult
Solution Approach 1:
The patent segments the communication system into two distinct terminal groups: first terminals that perform both uplink and downlink communications within a predetermined time interval, and second terminals that perform only downlink communication. This segmentation allows the system to accommodate both low-latency requirements (first terminals with bidirectional communication) and wide-coverage requirements (second terminals with unidirectional communication) simultaneously, resolving the contradiction between coverage and latency.
2Adaptability or versatility
If multiple types of communication with different delay amounts are frequency-multiplexed, then diverse traffic requirements are supported, but resource allocation complexity increases
Solution Approach 1:
The patent applies local quality by assigning different communication patterns to different terminal groups based on their specific requirements. First terminals are configured for bidirectional communication to meet low-latency requirements, while second terminals are configured for unidirectional downlink communication for wide coverage. This localized differentiation simplifies resource allocation compared to a uniform approach, as each group has clearly defined communication patterns that are easier to manage.
3Loss of time
If a first terminal performs both uplink and downlink communication in each predetermined time interval, then low-latency communication is enabled, but power consumption increases
Solution Approach 1:
The patent merges the communication capabilities of first terminals (which perform both uplink and downlink) with second terminals (which perform only downlink) within the same frequency-multiplexed system. By combining these different communication patterns in the same resource framework, the system achieves efficient resource utilization where terminals with higher power consumption (first terminals) provide low-latency service, while terminals with lower power consumption (second terminals) provide wide-coverage service, balancing overall system efficiency.
Data Source
AI summary
A communication system for which a first time period and a second time period different from the first time period are set in each of predetermined time intervals, includes: a base station; a first terminal configured to execute radio transmission between the first terminal and the base station in either one of an uplink and a downlink during the first time period and radio transmission between the first terminal and the base station in the other one of the uplink and the downlink in a direction opposite to the first time period during the second time period; and a second terminal configured to execute radio transmission between the second terminal and the base station in a link in the same direction as the first terminal during the first time period and does not execute radio transmission between the second terminal and the base station during the second time periods.