Configured Grant Uplink RB Allocation in SBFD 5G NR
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Solution Overview
Problem
In wireless networks using 3GPP 5G New Radio (NR) with time division duplexing (TDD), the allocation of limited time duration for uplink transmissions can result in reduced coverage and increased latency, and the issue of overlapping frequency domain resources for configured grant (CG) physical uplink shared channel (PUSCH) transmissions in subband non-overlapping full duplex (SBFD) mode leads to incomplete transmissions.
Innovation Solution
User equipment (UE) and base station (BS) systems determine resource blocks (RBs) and transport blocks (TBs) for CG-PUSCH transmissions, ensuring proper allocation within UL subbands during SBFD symbols, even when overlapping with DL subbands, by using indicators and priority thresholds to manage CG configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If time division duplexing (TDD) is used to allocate limited time duration for uplink transmissions, then the system can operate with conventional TDD mode, but the coverage is reduced and latency is increased
Solution Approach 1:
The patent introduces dynamic full duplex operation where the system can switch between conventional TDD mode and full duplex mode based on traffic conditions and channel state. This dynamic adaptation allows the system to overcome the fixed time allocation limitations of TDD, improving both coverage and latency by enabling simultaneous uplink and downlink transmissions when conditions permit.
Solution Approach 2:
The patent changes the operational parameters by introducing full duplex capability that allows simultaneous transmission in both uplink and downlink directions. This parameter change from sequential TDD operation to parallel full duplex operation fundamentally improves coverage and reduces latency by eliminating the time division constraint.
2Productivity
If subband non-overlapping full duplex (SBFD) mode is introduced to support simultaneous UL and DL transmissions, then the system capacity is improved, but the frequency domain resource allocation becomes complex and CG-PUSCH transmissions may overlap with DL subbands
Solution Approach 1:
The patent segments the frequency domain into distinct uplink subbands and downlink subbands within the full duplex bandwidth. This segmentation allows independent resource allocation and management for CG-PUSCH transmissions, preventing overlap with DL subbands while maintaining high system capacity. The segmented approach simplifies the complexity by providing clear frequency boundaries for different transmission types.
Solution Approach 2:
The patent applies local quality by assigning specific frequency subbands dedicated to uplink transmissions and others to downlink transmissions. This local differentiation in frequency domain allows CG-PUSCH transmissions to operate in protected uplink subbands without interfering with downlink subbands, resolving the resource allocation complexity while maintaining high system capacity.
3Adaptability or versatility
If CG-PUSCH transmissions are performed in SBFD symbols with overlapping frequency domain resources, then the transmission flexibility is improved, but the transmission reliability deteriorates due to incomplete transmissions
Solution Approach 1:
The patent performs preliminary action by determining the frequency domain resource allocation for CG-PUSCH transmissions before the actual transmission occurs. The system pre-allocates uplink subbands and identifies available resources in SBFD symbols, ensuring that CG-PUSCH transmissions are scheduled in frequency resources that do not overlap with downlink subbands. This preliminary resource determination prevents transmission conflicts and ensures reliable transmission while maintaining flexibility.
Data Source
AI summary
The present application relates to a UE, a BS and a method for CG UE transmission. The method includes: receive, via the UE, a CG configuration from the BS: determine, via the UE, whether to perform a CG-PUSCH transmission in a first set of symbols corresponding to the CG configuration, wherein the first set of symbols includes at least one first symbol: when determining to perform the CG-PUSCH transmission, determine a first set of RBs, wherein the CG-PUSCH transmission occupies the first set of RBs; and when determining to perform the CG-PUSCH transmission, determine, via the UE, a TB to be carried by the CG-PUSCH transmission.