FUTUREWEI · 10.5.1.3

Futurewei proposes that 6GR bandwidth operation study focus on BW determination and adaptation optimizing energy efficiency and spectrum utilization for diverse device types. They identify specific 5G NR BWP design disadvantages—excessive RRC configuration parameters, long switching delays causing service interruptions, DCI-based switching reliability issues, and fragmentation from redundant BWP types—and require 6GR solutions to reduce complexity, overhead, switching latency, and interruptions while increasing reliability. They study two distinct post-initial-access framework options: Option A (single active logical contiguous virtual resource across multiple carriers) and Option B (multiple independent contiguous physical frequency resources each active within one carrier). They propose studying initial DL BW and initial UL BW as contiguous PRB regions supporting synchronization, system information, paging, and random access, with co-location and center-frequency alignment for TDD to simplify initial access. They require supporting HARQ process continuity during BW switching and propose studying two TB transmission schemes for intra-cell carrier aggregation: single TB over separated allocations with a single HARQ process versus separate TBs per allocation with independent HARQ processes.

Futurewei proposes allowing a single 6GR cell to map to multiple component carriers to handle fragmented irregular spectrum, preserving the 5G NR BWP definition as a contiguous spectrum part within a carrier. They propose UE operation with more than one active BWP simultaneously in a multi-carrier cell, introducing intra-cell CA with one PCC/PBWP for control/RS/RRC connectivity and one or more SBWPs for data exchange. They require the PBWP to remain active during SBWP activation/deactivation to minimize disruptions and transition latency. They propose studying two HARQ solutions for multiple active BWPs: single TB transmission over multiple active BWPs with one HARQ process per TB, versus one TB transmission per active BWP with one HARQ process per BWP. They propose improving BWP DCI-based switching reliability via two-stage DCI or MAC CE, and studying BWP association with QoS for improved performance.