Orthogonal Uplink Control Message Reception in Time Slots
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Solution Overview
Problem
In wireless communication systems, the existing methods for receiving uplink control messages from multiple user equipments (UEs) at the same time slot result in inefficient use of radio resources due to latency and the need for UEs to wait for others to transmit, leading to suboptimal utilization of available resources.
Innovation Solution
A base station transmits downlink messages using different beams for each UE and selects UEs for simultaneous uplink transmission based on positioning and signal-to-noise ratio (SNR), allowing UEs to transmit uplink control messages orthogonally in the frequency domain within the same time slot, using scheduling information or autonomously, and receives these messages using analog beamforming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UEs transmit uplink control messages at different times to avoid collision, then interference between messages is reduced, but transmission latency increases and radio resource utilization decreases
Solution Approach 1:
The patent segments the uplink control messages from different UEs into different orthogonal frequency resources (different subcarriers or resource blocks). This allows multiple messages to be transmitted simultaneously in the same time slot without interference, as each message occupies a distinct frequency segment. The base station can then receive and separate these messages using the assigned frequency resources, eliminating the need for time-based sequential transmission.
Solution Approach 2:
The patent transitions from one-dimensional time-based sequential transmission to two-dimensional time-frequency resource allocation. By introducing frequency diversity as an additional dimension for resource allocation, multiple UEs can transmit simultaneously in the same time slot using different frequency resources, thereby reducing latency while maintaining transmission reliability through orthogonal frequency separation.
2Reliability
If UEs wait for other UEs to transmit before sending their messages, then collision avoidance is achieved, but system productivity decreases
Solution Approach 1:
The patent divides the available frequency spectrum into multiple orthogonal resources and assigns specific frequency segments to different UEs for simultaneous uplink control message transmission. This segmentation eliminates the need for UEs to wait for others to finish transmitting, as each UE can transmit its message independently in its assigned frequency resource during the same time slot, thereby improving system throughput while maintaining transmission reliability.
Solution Approach 2:
The patent enables continuous simultaneous transmission of uplink control messages from multiple UEs by allocating orthogonal frequency resources. Instead of having UEs wait in sequence (interrupted transmission), all authorized UEs can transmit their messages continuously and simultaneously in the same time slot, maximizing the utilization of radio resources and improving overall system productivity.
3Productivity
If a small number of bits are used for uplink control messages, then message transmission efficiency is improved, but the capacity to carry control information is reduced
Solution Approach 1:
The patent utilizes the frequency domain as an additional dimension to expand control information capacity. By allocating different orthogonal frequency resources to different UEs or different types of control information, the system can simultaneously carry multiple control messages with sufficient bit capacity without compromising transmission efficiency. The orthogonal frequency multiplication effectively increases the overall information carrying capacity of the uplink control channel.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables efficient simultaneous uplink transmission from multiple UEs, reducing latency and optimizing the use of radio resources by allowing orthogonal frequency or spreading code-orthogonal messages to be sent in the same time slot, thereby improving communication efficiency.
Implementation Method 1
The base station may use analog beamforming to receive the simultaneous uplink transmissions
Data Source
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AI summary
A base station may transmit scheduling information comprising one or more first downlink messages to a first user equipment (UE) in a first beam. The base station may transmit one or more second downlink messages to a second UE in a second beam. In response to the transmission of the one or more first downlink messages, the base station may receive one or more first uplink control messages from the first UE in a time slot. In response to the transmission of the one or more second downlink messages, the base station may receive one or more second uplink control messages from the second UE in the same time slot. The one or more second uplink control messages may be frequency-orthogonal or spreading code-orthogonal to the one or more first uplink control messages.