HARQ-ACK Uplink Resource Selection in Unlicensed Wireless Networks
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Solution Overview
Problem
Future wireless communications networks face challenges in efficiently supporting diverse devices with varying data traffic profiles and latency/reliability requirements, particularly in unlicensed frequency bands, where contention for resources can lead to HARQ-ACK feedback failures due to unavailable uplink communications resources.
Innovation Solution
A method for transmitting HARQ-ACK using next available communications resources, differentiated by priority, to ensure timely acknowledgment signaling even when uplink resources are not initially allocated, employing transmission rules that prioritize urgent transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uplink communications resources are allocated for HARQ-ACK transmission in unlicensed frequency bands, then HARQ-ACK feedback can be transmitted, but the contentious access procedure may fail and resources may not be available
Solution Approach 1:
The network device performs preliminary actions by allocating alternative uplink communications resources in advance and configuring transmission rules for selecting among multiple resources. When the initial resource becomes unavailable due to contentious access failures, the UE can immediately switch to pre-configured alternative resources without waiting for new allocations, thus maintaining transmission reliability.
Solution Approach 2:
The system changes the parameter of resource availability by introducing multiple alternative uplink resources with different characteristics. The UE can select from these resources based on transmission rules, effectively changing the resource selection parameter to overcome access failures in unlicensed bands.
2Productivity
If the communications device waits for allocated uplink resources to transmit HARQ-ACK, then resource usage is optimized, but transmission latency increases when resources are not available
Solution Approach 1:
The network device performs preliminary actions by allocating alternative uplink communications resources in advance and configuring transmission rules for selecting among multiple resources. When the initial resource becomes unavailable due to contentious access failures, the UE can immediately switch to pre-configured alternative resources without waiting for new allocations, thus maintaining transmission reliability.
Solution Approach 2:
The system introduces dynamic resource selection capability where the UE can adaptively choose from multiple alternative uplink resources based on real-time availability and transmission rules. This dynamic approach allows the system to balance resource efficiency with low latency requirements by selecting the most appropriate resource at transmission time.
3Reliability
If multiple alternative uplink resources are allocated for HARQ-ACK transmission, then transmission reliability improves, but device complexity increases
Solution Approach 1:
The UE is empowered with self-service capability to autonomously select appropriate uplink resources from the allocated alternatives based on pre-configured transmission rules. This self-service approach reduces the need for continuous network intervention and complex coordination, thereby managing device complexity while maintaining multiple resource options for reliable transmission.
4Adaptability or versatility
If the communications device uses transmission rules to select from multiple uplink resources, then adaptability to resource availability improves, but processing complexity increases
Solution Approach 1:
The UE is empowered with self-service capability to autonomously select appropriate uplink resources from the allocated alternatives based on pre-configured transmission rules. This self-service approach reduces the need for continuous network intervention and complex coordination, thereby managing device complexity while maintaining multiple resource options for reliable transmission.
Data Source
AI summary
A method of receiving data at a communications device from a wireless communications network is provided. The method comprises receiving downlink control information indicating an allocation of downlink communications resources of a wireless access interface provided by the wireless communications network for receiving downlink data, the downlink control information also providing an indication of a relative priority associated with the received downlink data, and receiving the downlink data from the allocated downlink communications resources.