Uplink Control Channel Resource Allocation for Function-Reduced Terminals
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Solution Overview
Problem
In wireless communication systems, it is challenging for function-reduced IoT devices to efficiently multiplex resources for uplink control information transmission due to differences in UE capabilities compared to conventional devices, leading to difficulties in coexistence with normal terminals.
Innovation Solution
A terminal is configured with a reception unit to receive uplink control channel configurations from a base station, a control unit to determine resources for the uplink control channel, and a transmission unit to transmit the channel using resources that differ from those used by non-function-reduced UEs, especially by disabling frequency hopping and applying distinct base sequences to each half of the resource.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If function-reduced terminals use the same resource allocation as normal terminals, then device complexity is reduced, but resource multiplexing efficiency deteriorates due to capability differences
Solution Approach 1:
The patent applies local quality by configuring different PUCCH resource allocation parameters for function-reduced terminals compared to normal terminals. Specifically, function-reduced terminals use a different relationship between PUCCH resource index and physical resource block allocation, allowing each terminal type to operate optimally according to its capabilities while sharing the same time-frequency resources without collision
Solution Approach 2:
The patent changes the allocation parameters for PUCCH resources based on terminal type. The base station configures different parameter sets (e.g., different offsets, different mapping relationships) for function-reduced terminals versus normal terminals, enabling efficient resource multiplexing while accommodating the reduced capabilities of IoT devices
2Reliability
If frequency hopping is enabled for function-reduced terminals, then communication reliability is improved, but resource collision with normal terminals increases
Solution Approach 1:
The patent extracts the frequency hopping function from the universal resource allocation scheme and applies it selectively. Function-reduced terminals are configured with frequency hopping disabled (or with different parameters), separating their resource behavior from normal terminals. This extraction eliminates resource collision while allowing each terminal type to use the reliability-enhancing feature appropriate to its capabilities
3Reliability
If function-reduced terminals use distinct base sequences, then resource orthogonality is improved, but sequence resource consumption increases
Solution Approach 1:
The patent changes the base sequence selection parameters for function-reduced terminals. By configuring different starting positions, different cyclic shifts, or different length parameters for the base sequences used by function-reduced terminals, the patent achieves orthogonal separation from normal terminals' sequences, preventing collision while reusing the same sequence pool efficiently
Data Source
AI summary
A terminal includes: a reception unit configured to receive a configuration related to an uplink control channel from a base station; a control unit configured to determine a resource of the uplink control channel, based on the configuration; and a transmission unit configured to transmit the uplink control channel via the resource. In a case where the configuration indicates that frequency hopping is disabled, the control unit causes a base sequence applied to a hop of a first half of the resource to be different from a base sequence applied to a hop of a second half of the resource, and determines the resource to be different from a resource used by a UE that is not a function-reduced UE.