UE Priority Scheduling for SBFD UL-DL Transmission Conflicts
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Solution Overview
Problem
In wireless networks using subband non-overlapping full duplex (SBFD) mode, devices that do not support simultaneous transmitting and receiving face conflicts between uplink (UL) and downlink (DL) transmissions, leading to reduced coverage and increased latency.
Innovation Solution
A user equipment (UE) and base station (BS) are equipped with processors to determine priority levels for UL and DL transmissions, allowing them to prioritize one over the other based on priority levels, and adjust transmissions accordingly by dropping, puncturing, or retransmitting data in non-overlapping symbol sets to resolve conflicts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If simultaneous UL and DL transmissions are allowed in SBFD mode, then coverage and latency are improved, but conflicts arise between UL and DL transmissions for devices that don't support simultaneous transmitting and receiving
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the time-frequency resource allocation parameters for UL and DL transmissions. When conflicts are detected, the system changes the allocation parameters by puncturing (removing) certain resource elements from one transmission to resolve the conflict, thereby maintaining reliable coverage while eliminating harmful transmission conflicts.
Solution Approach 2:
The patent introduces an intermediary mechanism in the form of a conflict resolution layer that mediates between UL and DL transmission requirements. This intermediary function identifies conflicts and applies resolution rules (such as prioritizing certain transmissions or puncturing resources) to balance the competing demands, allowing SBFD mode to maintain both coverage reliability and avoid transmission conflicts.
2Reliability
If UL transmission time duration is increased, then coverage is improved, but latency increases
Solution Approach 1:
The patent applies segmentation by dividing the time-frequency resources into distinct UL and DL subbands that can operate simultaneously. This segmentation allows the system to provide extended UL transmission duration for coverage improvement while maintaining separate DL transmission paths, thereby reducing overall latency compared to traditional TDD where UL and DL must strictly alternate in time.
Solution Approach 2:
The patent transitions from purely time-based resource allocation (TDD) to a two-dimensional time-frequency allocation approach in SBFD mode. By utilizing the frequency dimension to separate UL and DL transmissions, the system can extend UL duration for coverage while simultaneously maintaining DL transmissions in other frequency resources, thus reducing latency without sacrificing coverage.
3Productivity
If UL and DL transmissions are allocated in the same time duration, then resource utilization is improved, but conflicts occur for non-full-duplex devices
Solution Approach 1:
The patent dynamically changes resource allocation parameters based on device capabilities and traffic conditions. For non-full-duplex devices, the system adjusts parameters by puncturing conflicting resource elements in real-time, allowing high resource utilization in SBFD mode while eliminating conflicts for devices that cannot simultaneously transmit and receive.
Solution Approach 2:
The patent introduces dynamic conflict resolution mechanisms that adapt resource allocation in real-time. When UL and DL transmissions are scheduled in the same time duration, the system dynamically identifies conflicts and applies resolution strategies (such as prioritizing critical transmissions or puncturing less important resources), thereby maintaining high resource utilization while preventing harmful conflicts for non-full-duplex devices.
Data Source
AI summary
The present application relates to methods and apparatuses for handling conflicts. An embodiment of the present disclosure provides a user equipment (UE), which includes: a transceiver; and a processor coupled with the transceiver and configured to: receive a first indication associated with a first uplink (UL) transmission in a first set of symbols; receive a second indication associated with a first downlink (DL) reception in a second set of symbols; determine a set of remaining symbols based on a first priority level associated with the first UL transmission and a second priority level associated with the first DL reception; and perform one of the following: perform the first UL transmission in the first set of symbols and a second DL reception in the set of remaining symbols in the case that the set of remaining symbols is included in the second set of symbols: or perform the first DL reception in the second set of symbols and a second UL transmission in the set of remaining symbols in the case that the set of remaining symbols is included in the first set of symbols.