Base Station Resource Block Grouping for Uplink Reference Signal Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional radio communication systems face reduced throughput and increased reference signal occupancy in the uplink due to the need for all mobile stations to transmit reference signals using all resource blocks, leading to a decrease in data transmission region and efficiency.
Innovation Solution
A base station configuration that groups resource blocks and schedules mobile stations based on received reference signal qualities, allowing each mobile station to transmit reference signals only within its assigned group, reducing the number of reference signals and enabling efficient multiuser diversity gain through dynamic correspondence changes between resource blocks and groups over time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If all mobile stations transmit reference signals using all resource blocks, then the base station can measure received quality of each RB for frequency scheduling, but the amount of reference signals occupying the uplink increases and the region for data transmission becomes smaller
Solution Approach 1:
The patent divides resource blocks into multiple groups and assigns mobile stations to specific groups. Each mobile station transmits reference signals only on resource blocks within its assigned group rather than all resource blocks. This segmentation reduces the total number of reference signals in the uplink while maintaining the base station's ability to measure received quality for frequency scheduling decisions.
2Loss of information
If all mobile stations transmit reference signals on all resource blocks, then comprehensive channel quality information is obtained, but the number of reference signals increases following the increase in the number of mobile stations
Solution Approach 1:
The patent implements local quality measurement by having mobile stations transmit reference signals only on resource blocks within their assigned groups. The base station measures received quality locally within each group rather than requiring measurements across all resource blocks from all mobile stations. This approach maintains sufficient channel quality information for scheduling decisions while significantly reducing the total quantity of reference signals.
3Measurement precision
If reference signals are transmitted using all resource blocks, then accurate frequency selectivity scheduling is achieved, but the uplink capacity for data transmission is reduced
Solution Approach 1:
The patent employs dynamic resource block group assignment where mobile stations are assigned to different groups in different subframes. This dynamic approach allows the system to adaptively manage the balance between reference signal transmission and data transmission regions. By changing group assignments over time, the system maintains accurate frequency selectivity measurements while maximizing data transmission capacity in each subframe.
Data Source
AI summary
A radio communication base station device can efficiently obtain a multiuser diversity gain from frequency scheduling while reducing the amount of a reference signal occupying an uplink. In the device, a grouping section divides a plurality of RBs (Resource Blocks) into a plurality of RB groups. An RB group control unit performs a control to change the correspondence relationship between the RBs and the RB groups with time. When the grouping section divides the RBs into the RB groups, the RB control unit performs a control to change a combination of the RBs included in each of the RB groups with time. A scheduling section performs a scheduling of allocating each of a plurality of mobile stations to each of the RBs in each of the RB groups according to the reception quality of the reference signal.