Wireless Ranging via Terminal Grouping and Resource Partitioning
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Solution Overview
Problem
In wireless communication systems, especially in mobile environments using OFDMA, the propagation delay differences between terminals and base stations lead to signal interference, reducing receiving performance and hindering high-speed data transmission. The existing ranging process is inefficient, resulting in increased load and potential data transmission failures due to collisions and prolonged ranging times.
Innovation Solution
A method where terminals are grouped and radio resources are dynamically reassigned based on the number of terminals in each group, with the radio resource allocation unit calculating and adjusting the resource allocation to maximize ranging success probability, thereby reducing collisions and increasing the efficiency of the ranging process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If multiple terminals transmit ranging signals simultaneously to a base station, then the ranging process can be completed faster, but signal collisions occur leading to reduced ranging success rate
Solution Approach 1:
The patent segments the set of terminals into multiple groups, where each group transmits ranging signals in different time slots or using different ranging codes. This segmentation prevents signal collisions between terminals while maintaining parallel processing capability, thus reducing overall ranging process time while ensuring high ranging success rate for each group
Solution Approach 2:
The base station dynamically assigns terminals to different groups based on real-time conditions such as signal quality, distance, and current system load. This dynamic grouping allows the system to adaptively optimize the ranging process, balancing between speed and success rate according to actual network conditions
2Device complexity
If the base station uses a single radio resource for all terminals, then resource allocation is simple, but ranging signal collisions increase and receiving performance deteriorates
Solution Approach 1:
The patent segments the single radio resource into multiple orthogonal resources (different time slots, frequency bands, or code sequences) assigned to different terminal groups. This segmentation enables simultaneous ranging transmissions without interference, improving receiving performance while maintaining manageable complexity through systematic resource management
3Device complexity
If propagation delay time is not compensated, then the system operation is simple, but signal interference occurs between terminals at different distances
Solution Approach 1:
The patent applies preliminary action by having the base station calculate and compensate for propagation delay times before the actual data transmission begins. During the ranging phase, the base station measures the delay for each terminal and adjusts timing parameters in advance, ensuring that subsequent data transmissions from terminals at different distances arrive synchronously without interference
Data Source
AI summary
A method for ranging in a wireless communication system and a communication apparatus and/or system using the same are provided. A base station (BS) device includes a terminal grouping unit to group terminals associated with the BS device into a plurality of groups, a radio resource assignment unit to allocate a radio resource assigned to the BS device to each of the plurality of groups, a transmission unit to transmit information about a radio resource assigned to a first group of the plurality of groups to a terminal included in the first group, and a receiving unit to receive a ranging signal from the terminal using the radio resource assigned to the first group, wherein the terminal grouping unit assigns the terminal to be included in a second group of the plurality of groups where the ranging signal is not received by the receiving unit.