Uplink Resource Selection via DCI Feedback
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Solution Overview
Problem
In wireless communication systems, when multiple uplink resources are active in a cell, especially in unlicensed frequency bands, wireless devices may fail to transmit acknowledgement information, leading to increased transmission latency and reduced system throughput due to misalignment between the base station and the device, and failure in listen-before-talk procedures.
Innovation Solution
The base station transmits downlink control information that includes an uplink resource indicator, allowing the wireless device to select an active uplink resource for acknowledgement transmission based on the indicator, and uses a resource hopping indicator to switch between active resources, ensuring clear channel availability through listen-before-talk procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple uplink resources are active in a cell, then resource utilization and system capacity are improved, but transmission reliability deteriorates due to misalignment between base station and device
Solution Approach 1:
The base station provides feedback to the wireless device through downlink control information, indicating which uplink resource the base station will monitor. This feedback mechanism ensures that the device transmits acknowledgments on the correct resource, resolving the misalignment issue while maintaining multiple active uplink resources for high capacity
Solution Approach 2:
The downlink control information acts as an intermediary that coordinates between the base station's monitoring resource and the device's transmission resource. This intermediary signal ensures both parties use the same uplink resource, maintaining reliability without reducing system capacity
2Adaptability or versatility
If the wireless device selects an uplink resource for acknowledgement transmission, then transmission flexibility is improved, but detection accuracy deteriorates due to resource mismatch
Solution Approach 1:
The device uses feedback from the downlink control information to determine the correct uplink resource for acknowledgment transmission. This feedback ensures the device's selected resource matches the base station's monitoring resource, maintaining both flexibility and detection accuracy
3Ease of operation
If the wireless device performs listen-before-talk procedure on an active uplink resource, then channel access fairness is improved, but transmission speed deteriorates due to procedure failure
Solution Approach 1:
The device performs the listen-before-talk procedure in advance on the indicated uplink resource before acknowledgment transmission. This preliminary channel access check ensures fair access to unlicensed spectrum while maintaining transmission speed by preventing conflicts and retransmissions
Data Source
AI summary
Systems, apparatuses, and methods are described for wireless communications. A base station may transmit, to a wireless device, a DCI format comprising a BWP indicator. The wireless device may select, from a plurality of active BWPs of a cell, an active BWP based on the BWP indicator. The wireless device may transmit an uplink signal via the selected active BWP.