Uplink Transmission Narrowband Switching Delay Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In machine type communication (MTC) within LTE systems, low-complexity or low-cost user equipment (UE) faces unnecessary uplink information transmission delays and increased resource scheduling complexity due to the need for additional subframes for frequency adjustment when switching between narrowbands, leading to inefficient bandwidth utilization.
Innovation Solution
The proposed method involves sending uplink information on different frequency resources in distinct subframe sets, where the UE switches between narrowbands using the interval between these subframes, eliminating the need for reserved interval subframes and allowing for seamless frequency adjustment during uplink information transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If interval subframes are reserved for frequency adjustment when switching between narrowbands, then frequency switching capability is enabled, but uplink information transmission delay increases and resource scheduling complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring the frequency hopping pattern and narrowband selection in the uplink grant, allowing the UE to prepare and execute frequency switching without requiring reserved interval subframes. The frequency adjustment is performed in advance based on the configured pattern, eliminating the need for additional time resources.
Solution Approach 2:
The patent extracts the frequency adjustment function from the time domain (reserved subframes) and implements it in the frequency domain through narrowband hopping. By taking out the frequency switching requirement from the time resource allocation, the patent eliminates the need for interval subframes while maintaining the frequency switching capability.
2Adaptability or versatility
If interval subframes are reserved for frequency adjustment when switching between narrowbands, then frequency switching capability is enabled, but resource scheduling complexity increases
Solution Approach 1:
The base station pre-configures the frequency hopping pattern and narrowband selection parameters in the uplink grant before the actual transmission. This preliminary configuration allows the UE to autonomously perform frequency switching without requiring complex real-time scheduling decisions, thereby reducing resource scheduling complexity while enabling frequency switching capability.
Solution Approach 2:
The patent enables self-service by allowing the UE to autonomously perform frequency hopping and narrowband selection based on pre-configured parameters in the uplink grant. The UE independently manages the frequency switching process without requiring base station intervention or complex scheduling instructions, thereby simplifying resource scheduling complexity.
3Device complexity
If frequency adjustment time of maximum two symbols is used for narrowband switching, then UE complexity is reduced, but transmission delay increases when using reserved subframes
Solution Approach 1:
The patent ensures continuity of useful action by eliminating the reserved interval subframes that caused transmission delays. The frequency adjustment is performed within the actual transmission time using the pre-configured narrowband hopping pattern, allowing continuous uplink information transmission without unnecessary interruptions or delays.
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
An uplink information transmission method, a base station, and user equipment are disclosed. The uplink information transmission method includes: sending, by UE, first uplink information on a first frequency resource of a first subframe set; and sending, by the UE, second uplink information on a second frequency resource of a second subframe set, where the first frequency resource and the second frequency resource are frequency resources included in two different narrowbands; a radio frame in which a subframe in the first subframe set is located is different from a radio frame in which a subframe in the second subframe set is located, and any subframe included in the first subframe set and any subframe included in the second subframe set belong to different radio frames; or a half-frame in which a subframe in the first subframe set is located is different from a half-frame in which a subframe in the second subframe set is located, and any subframe included in the first subframe set and any subframe included in the second subframe set belong to different half-frames.