HARQ Slot Offset Calculation for Sub-Band Full Duplex
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Solution Overview
Problem
Wireless communication systems face challenges in efficiently managing hybrid automatic repeat request (HARQ) processes in frame structures that include both sub-band full duplex (SB-FD) and time division duplex (TDD) slots, particularly in adapting to varying bandwidth and latency requirements of different applications and scenarios.
Innovation Solution
The implementation of a method where user equipment (UE) receives and calculates slot offsets based on parameters provided by a base station, allowing for adaptive use of SB-FD and TDD slot formats, enabling flexible HARQ process scheduling and prioritization to accommodate diverse application needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sub-band full duplex (SB-FD) slots are used to enable simultaneous uplink and downlink communication on the same carrier, then spectral efficiency and bandwidth utilization are improved, but interference management and signal reception reliability deteriorate due to self-interference between simultaneous transmissions
Solution Approach 1:
The patent segments the frequency spectrum into multiple sub-bands, with different sub-bands allocated for uplink and downlink transmissions simultaneously. This frequency-domain segmentation allows full duplex operation by separating interfering signals into distinct frequency regions, thereby maintaining spectral efficiency while reducing self-interference through frequency isolation
Solution Approach 2:
The patent applies local quality by assigning different quality characteristics to different frequency sub-bands. Specifically, certain sub-bands are optimized for uplink with enhanced reception sensitivity, while other sub-bands are optimized for downlink with enhanced transmission power, allowing each sub-band to operate with locally optimized parameters that mitigate interference while maintaining overall system reliability
2Ease of operation
If HARQ processes are scheduled with fixed timing in traditional TDD systems, then implementation simplicity is maintained, but adaptability to varying application requirements for bandwidth and latency is reduced
Solution Approach 1:
The patent introduces dynamic HARQ timing adjustment mechanisms that allow the timing parameters (such as K0, K1, K2 offsets) to be flexibly configured based on application requirements. The system can adaptively adjust HARQ process timing, bundling, and multiplexing parameters in response to varying bandwidth and latency demands, transforming the static HARQ scheduling of traditional TDD into a dynamic framework that maintains implementation simplicity through standardized procedures while achieving high adaptability
Solution Approach 2:
The patent employs parameter changes by allowing key HARQ parameters (timing offsets, process numbers, bundling configurations) to be dynamically modified according to service type and network conditions. Different parameter sets can be configured for different application scenarios, enabling the system to optimize latency for real-time applications while maintaining robustness for other services, all within a unified HARQ framework
3Productivity
If slot offset calculations include all slot types (both SB-FD and TDD slots), then resource utilization is maximized, but calculation complexity and potential for timing errors increase
Solution Approach 1:
The patent segments the slot calculation process by introducing separate counting mechanisms for different slot types. Specifically, it defines distinct slot offset parameters (such as slotOffsetSBFD for SB-FD slots and slotOffsetTDD for TDD slots) that are calculated independently based on their respective duplex characteristics. This segmentation simplifies the overall calculation complexity by breaking down the unified slot offset problem into manageable, type-specific sub-problems while still achieving comprehensive resource utilization across all slot types
Solution Approach 2:
The patent introduces an intermediary layer in the slot offset calculation by using a standardized reference frame and explicit parameter signaling. The base station acts as an intermediary that provides pre-calculated slot offset parameters to the UE through downlink control information, eliminating the need for the UE to perform complex real-time calculations involving multiple slot type conversions. This intermediary parameter signaling simplifies UE complexity while maintaining accurate resource utilization
Data Source
AI summary
A UE may identify slots to transmit and/or receive information related to one or more HARQ processes in frame structure that includes both sub-band full duplex slot types and time division duplex slot types. Based on a first slot used for control information, a UE can identify a second slot for PUSCH or PDSCH communication based on an offset between the first slot and the second determined by calculating slot offsets (e.g., based on parameters received from a base station). In some aspects, a UE may exclude certain slot duplex types (e.g., SBFD or TDD) when calculating slot offsets. In some aspects, a UE may calculate slot offsets differently for different HARQ processes corresponding to one frame. In some aspects, slot offset behaviors may be based on priority of information associated with a HARQ process.