Scheduling Request Transmission for Buffer Status Report in Millimeter Wave Systems
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Solution Overview
Problem
In wireless communication systems, especially those operating at millimeter wave frequencies, UEs face challenges in transmitting buffer status reports (BSR) due to insufficient uplink resources and directional beamforming, which can lead to delayed communication and inefficient resource allocation.
Innovation Solution
A UE receives a directional synchronization subframe from a base station and transmits a scheduling request during a random access channel (RACH) time period, using resources such as physical uplink shared channel (PUSCH) or physical uplink control channel (PUCCH), based on identified synchronization signals and cyclic shifts, to obtain grants for BSR transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If directional beamforming is used to overcome signal attenuation, then communication reliability is improved, but uplink resource availability deteriorates
Solution Approach 1:
The patent applies preliminary action by having the UE transmit a scheduling request during the RACH time period before actual uplink data transmission. This early scheduling request initiates the resource allocation process in advance, allowing the base station to grant uplink resources (PUSCH/PUCCH) before the UE needs to transmit the BSR, thus resolving the contradiction between maintaining directional beamforming for reliability and ensuring uplink resource availability.
2Productivity
If uplink resources are allocated for BSR transmission, then communication efficiency is improved, but resource allocation complexity increases
Solution Approach 1:
The patent merges the scheduling request transmission with the existing RACH procedure. By combining these two functions into a single time period and using unified resource allocation mechanisms, the system improves communication efficiency while avoiding the need for separate complex resource allocation procedures, thus resolving the contradiction between productivity and device complexity.
3Speed
If scheduling request is transmitted during RACH time period, then resource acquisition speed is improved, but signal interference increases
Solution Approach 1:
The patent segments the RACH time period into distinct resource regions: one region for random access messages and another region for scheduling requests. This segmentation allows simultaneous transmissions to occur without interfering with each other, resolving the contradiction between fast resource acquisition and signal interference by enabling parallel access while maintaining signal integrity.
Data Source
AI summary
A UE may receive a directional synchronization subframe from a base station and transmit a scheduling request to the base station during a time period based on the directional synchronization subframe. The scheduling request may enable a base station to grant the UE resources to send a buffer status report (BSR). The time period may be associated with a random access channel (RACH) time period. The UE may also transmit a scheduling request within a frequency region of the RACH time period. The scheduling request may be transmitted based on a received indication of a set of subcarrier, a cyclic shift, or a sequence index. In some examples, the resources used by the UE to send the BSR may include physical uplink shared channel (PUSCH) or physical uplink control channel (PUCCH) resources.