Partial-Interlace Uplink Scheduling With Group Offsets and Per-Interlace LBT
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Solution Overview
Problem
In wireless communications systems, UEs configured for autonomous uplink (AUL) transmissions with partial channel bandwidths face limitations in resource utilization efficiency due to shared starting offsets, leading to underutilization when one UE has no data to transmit, and existing listen-before-talk (LBT) procedures can unnecessarily block later UEs.
Innovation Solution
Implementing group-based starting offset values and per-interlace LBT procedures for UEs, allowing UEs to determine unique starting offsets based on group identifiers and measure energy levels on assigned interlaces to avoid collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If UEs are configured with the same starting offset value for AUL transmissions, then resource allocation is simplified, but resource utilization efficiency deteriorates when one UE has no data to transmit
Solution Approach 1:
The patent applies local quality by assigning different starting offset values to different UEs based on their group identifiers. Instead of using a uniform starting offset for all UEs, each UE group receives a customized starting offset configuration, allowing UEs with no data to transmit to have their resources available for other UEs while maintaining simplified resource allocation through group-based configuration.
2Reliability
If UEs use fixed starting positions for AUL transmissions, then intra-cell UE blocking is avoided, but channel contention priority balance deteriorates between full-bandwidth and partial-bandwidth UEs
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting starting offset values based on UE group identifiers and transmission types. Full-bandwidth UEs and partial-bandwidth UEs are assigned different starting offset parameters, allowing the system to maintain blocking avoidance while adapting channel contention priorities to balance fairness between different UE categories.
3Device complexity
If LBT procedures are performed on the entire channel bandwidth, then channel access control is simplified, but later UEs are unnecessarily blocked when earlier UEs do not transmit
Solution Approach 1:
The patent applies segmentation by dividing the channel bandwidth into multiple interlaces and performing LBT procedures independently on each interlace rather than on the entire channel bandwidth. This allows later UEs to access interlaces that are not currently in use by earlier UEs, reducing unnecessary blocking while maintaining manageable channel access control through structured interlace-based procedures.
Data Source
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AI summary
Methods, systems, and devices for wireless communications are described. The described techniques provide for a base station transmitting to a user equipment (UE) a partial bandwidth configuration for uplink transmissions, where the partial bandwidth configuration may indicate a channel interlace and a portion of a channel bandwidth, for example, for autonomous uplink (AUL) transmissions. The base station may also transmit to the UE an AUL configuration including a group identifier. The UE may determine a starting offset with respect to an AUL subframe for a partial bandwidth transmission based on the group identifier. In some cases, different UEs may be grouped into groups of UEs allocated non-overlapping resources, and UEs allocated overlapping resources may have different starting offsets to begin transmitting. According to the determined starting offset, the UE may perform the partial bandwidth transmission over the channel interlace and the portion of the channel bandwidth.