Uplink Control Channel Resource Allocation in Short TTI Systems
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In 3GPP LTE/LTE-A systems, there is a conflict issue when transmitting an uplink control channel in response to a downlink data channel due to differences in frame structures between uplink and downlink, leading to resource overlap.
Innovation Solution
A method is introduced where an offset value is signaled through higher layer signaling to determine the resource for transmitting the uplink control channel, preventing resource conflicts by aligning the uplink control channel with the downlink data channel in a short transmission time interval frame structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If an uplink control channel is transmitted in response to a downlink data channel in a short TTI frame structure, then latency is reduced and data throughput is improved, but resource conflict occurs between uplink and downlink frame structures
Solution Approach 1:
The patent applies preliminary action by pre-configuring an offset value through higher layer signaling before the actual uplink control channel transmission. This offset value is used to determine the timing relationship between the downlink data channel and the uplink control channel, allowing the system to proactively prevent resource conflicts rather than reacting to them after they occur. The offset configuration is established in advance through RRC signaling or similar higher layer protocols.
Solution Approach 2:
The patent changes the timing parameter by introducing an offset value that shifts the uplink control channel transmission timing relative to the downlink data channel reception. This parameter adjustment allows flexible alignment of uplink and downlink resources in the short TTI frame structure, resolving the resource conflict while maintaining the low-latency benefits of short TTI operation.
2Adaptability or versatility
If different frame structures are used for uplink and downlink in short TTI, then flexibility in resource allocation is improved, but conflict problems occur when transmitting uplink control channels
Solution Approach 1:
The patent introduces an offset value as an intermediary parameter that mediates between the downlink data channel and the uplink control channel. This intermediary element simplifies the resource alignment process by providing a clear, configurable timing relationship that resolves the complexity of coordinating different uplink and downlink frame structures. The offset acts as a bridge that enables flexible frame structures while maintaining straightforward resource allocation rules.
Data Source
AI summary
Provided is a method and a device for transmitting an Ack/Nack of sPUCCH in response to the reception of short TTI-based sPDSCH in a 3GPP LTE/LTE-Advanced system. A base station may set, for each terminal, an offset value for setting a link between sPDSCH and sPUCCH, and transmit the set offset value to the terminal through upper layer signaling (RRC signaling), thereby enabling a terminal to use the offset value to allocate sPUCCH resources for transmitting an Ack/Nack in response to the reception of sPDSCH.