Full Duplex Frequency Hopping for SBFD PUSCH Alignment
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Solution Overview
Problem
In wireless communication systems, the use of subband full duplex (SBFD) slots can cause interference and latency issues due to frequency resources for PUSCH transmissions not coinciding with uplink subbands, leading to unnecessary retransmissions and increased latency.
Innovation Solution
Techniques for increasing the probability that frequency resources for PUSCH transmissions coincide with uplink subbands by configuring multiple frequency offsets and determining starting RBs based on the size of the uplink subband within a bandwidth part, rather than the BWP itself, to avoid dropping PUSCH repetitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If frequency resources for PUSCH transmissions are allocated in SBFD slots without considering uplink subband alignment, then frequency resource utilization is improved, but interference and latency increase due to misalignment with uplink subbands
Solution Approach 1:
The patent changes the parameter of frequency offset configuration from a single fixed value to multiple configurable offsets. The network entity configures a set of frequency offsets, and the UE selects appropriate offsets to ensure PUSCH transmissions align with uplink subbands in SBFD slots, thereby maintaining transmission reliability while utilizing frequency resources effectively.
Solution Approach 2:
The patent introduces dynamic selection of frequency offsets based on slot type. The UE determines whether a slot is an SBFD slot and dynamically selects frequency offsets from the configured set to align transmissions with uplink subbands. This dynamic adaptation resolves the contradiction between resource utilization and transmission reliability.
2Device complexity
If PUSCH repetitions are transmitted without frequency hopping in SBFD slots, then transmission simplicity is improved, but latency increases due to unnecessary retransmissions
Solution Approach 1:
The patent applies preliminary frequency hopping configuration where the network entity pre-configures multiple frequency offsets and hopping patterns. The UE uses these pre-configured parameters to perform frequency hopping in SBFD slots, ensuring alignment with uplink subbands before transmission occurs. This preliminary configuration prevents misalignment issues and reduces retransmissions without requiring complex real-time adjustments.
3Ease of operation
If frequency offsets are configured based on BWP size rather than uplink subband size, then configuration simplicity is improved, but transmission accuracy decreases leading to resource waste
Solution Approach 1:
The patent segments the frequency offset configuration into two parts: initial offsets based on BWP size for overall positioning, and additional offsets based on uplink subband size for precise alignment. This segmentation allows the system to maintain configuration simplicity while achieving the precision needed for accurate frequency alignment in SBFD slots.
Solution Approach 2:
The patent applies local quality adjustment by configuring different frequency offset parameters specifically for uplink subbands within the BWP. Instead of using a uniform configuration across the entire BWP, the system tailors frequency offsets to match the specific size and position of uplink subbands, thereby achieving precise alignment without overly complicating the overall configuration process.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for inter-slot and intra-slot frequency hopping in full duplex. A method performed by a user equipment (UE) includes receiving scheduling information from a network entity, wherein the scheduling information schedules transmission of a plurality of uplink data channel repetitions in a plurality of slots according to a frequency hopping scheme that configures frequency hops between transmissions of repetitions of the plurality of uplink data channel repetitions. The method also includes taking one or more actions related to transmitting, according to the frequency hopping scheme, the plurality of uplink data channel repetitions in the plurality of slots based on the scheduling information.