Buffer Status Report Adjustment for mmWave Link Reliability
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Solution Overview
Problem
In wireless communication systems operating in millimeter wave (mmWave) frequency bands, transmission powers are limited by maximum permissible exposure (MPE) constraints, leading to suboptimal performance due to power back-off, which can result in communication link failures, especially for uplink transmissions.
Innovation Solution
A user equipment (UE) determines a predicted data size based on an energy budget and per-bit transmission energy, adjusting the buffer status report (BSR) to influence the base station (BS) for desirable uplink grants, thereby minimizing transmission size while boosting transmission power to maintain communication links within MPE constraints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmission power is increased to overcome path-loss in mmWave bands, then communication reliability is improved, but MPE constraints are violated causing harmful electromagnetic exposure
Solution Approach 1:
The system dynamically adjusts transmission parameters including power levels, beamforming configurations, and modulation schemes based on real-time channel conditions and MPE constraints. The base station and UE adaptively modify transmission strategies to maintain reliable communication while staying within safety limits through continuous monitoring and adjustment of transmission characteristics
Solution Approach 2:
Beamforming technology concentrates transmission energy in specific directional beams rather than omnidirectional transmission. This localizes the electromagnetic energy in spatial domains, providing high signal strength along the beam path for reliable communication while reducing overall exposure in other directions, thus resolving the contradiction between reliability and harmful exposure
2Object-affected harmful factors
If transmission power is reduced to comply with MPE constraints, then electromagnetic exposure is limited, but communication performance deteriorates due to insufficient power to overcome path-loss
Solution Approach 1:
The system changes multiple transmission parameters simultaneously including frequency selection within mmWave bands, modulation and coding schemes, antenna configuration, and beamforming patterns. By optimizing the combination of these parameters, the system achieves acceptable communication performance while maintaining transmission power within MPE constraints
Solution Approach 2:
The system transitions from relying solely on power increase to achieve reliable communication to utilizing spatial dimension through beamforming and multi-antenna techniques. By adding the spatial dimension with directional beams and multiple transmission paths, the system overcomes path-loss without proportionally increasing power, thus maintaining productivity while limiting electromagnetic exposure
3Power
If buffer status report is adjusted to minimize transmission size, then transmission power requirements are reduced, but data transmission efficiency decreases
Solution Approach 1:
The system transmits only the necessary portion of buffered data in each uplink transmission rather than sending all available data. By transmitting partial data amounts that match the available power budget and channel conditions, the system avoids power shortages while maintaining acceptable transmission efficiency through multiple scheduled transmissions
Solution Approach 2:
The base station provides feedback through scheduling grants that indicate the optimal data amount for transmission based on current power conditions and channel quality. The UE uses this feedback to adjust its transmission size dynamically, ensuring efficient data transmission within power constraints while maintaining overall transmission efficiency through iterative optimization
Data Source
AI summary
Wireless communications systems and methods related to modifying a buffer status report (BSR) are provided. In one embodiment, a first wireless communication device determines a BSR based on at least a first data size and a predicted data size. The first wireless communication device transmits to a second wireless communication device, the BSR. The first wireless communication device receives from the second wireless communication device, a scheduling grant in response to the BSR. The first wireless communication device transmits to the second wireless communication device, a communication signal based on the scheduling grant.