Superposition Coding for Concurrent Sidelink Uplink Transmission
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Solution Overview
Problem
Conventional uplink and sidelink communication techniques in wireless communication systems are inefficient in utilizing available resources, particularly in vehicle-to-everything (V2X) communications, leading to suboptimal spectral efficiency and resource allocation.
Innovation Solution
Implementing superposition coding in wireless communications systems, where a user equipment (UE) transmits concurrent sidelink and uplink transmissions within a shared resource pool, with the UE encoding sidelink data as a base layer and uplink data as an enhancement layer, allowing for simultaneous transmission and efficient resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If separate resources are allocated for uplink and sidelink communications, then communication reliability is maintained, but spectral efficiency and resource utilization deteriorate
Solution Approach 1:
The patent combines uplink and sidelink transmissions by superimposing them in the time domain within the same time resource. The base station transmits both uplink signals (from UE to base station) and sidelink signals (from first UE to second UE) simultaneously in the same time slot, thereby merging previously separate resource allocations and improving spectral efficiency.
Solution Approach 2:
The patent segments the transmitted signals into distinct components: uplink signals and sidelink signals are separated in the time domain through superposition. The base station and second UE can selectively decode their respective signals by separating the superimposed components, allowing simultaneous transmission without interference.
2Productivity
If conventional uplink and sidelink techniques are used, then implementation simplicity is maintained, but resource utilization and throughput deteriorate
Solution Approach 1:
The patent employs feedback mechanisms where the base station provides downlink control information to schedule uplink transmissions, and the first UE provides feedback about sidelink resource allocation. This feedback enables coordinated resource sharing and ensures proper decoding at the receiving ends, facilitating the complex superposition operation.
Solution Approach 2:
The patent performs preliminary scheduling and resource allocation before the actual transmission. The base station allocates time resources for uplink transmissions in advance, and the first UE determines appropriate sidelink resources, allowing the complex superposition operation to be executed systematically during transmission time.
3Use of energy by moving object
If separate time resources are allocated for uplink and sidelink, then signal decoding reliability is improved, but time efficiency and battery life deteriorate
Solution Approach 1:
The patent merges uplink and sidelink transmissions in the time domain, allowing both types of signals to occupy the same time resource simultaneously. This time-sharing approach eliminates idle time between transmissions and improves energy efficiency while maintaining decoding reliability through proper signal separation at the receiver.
Solution Approach 2:
The patent resolves the time resource conflict by introducing a new dimension of signal separation in the time domain through superposition. Instead of allocating separate time slots, the system creates distinct signal dimensions that can be simultaneously transmitted and selectively decoded by the appropriate receivers.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A first user equipment (UE) in a wireless communications system, such as a vehicle-to-everything (V2X) communications systems, may communicate over sidelink to other UEs. The first UE may receive, from a base station, control signaling indicating a sidelink resource pool allocated for sidelink communication between the first UE and a second UE. The first UE may transmit an indication that superposition coding may be used to generate a concurrent sidelink and uplink transmission. The first UE may then transmit the concurrent sidelink and uplink transmission within a resource of the sidelink resource pool based on the indication. The second UE may decode the sidelink portion of the transmission, and the base station may decode the uplink portion of the transmission.