UE Timing Difference Measurement with Variable Bandwidth PRS
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Solution Overview
Problem
In 4G mobile communication systems, the difference in bandwidth allocation between cells hinders accurate timing difference measurement for location calculation, as existing methods assume identical bandwidths for positioning reference signals, leading to degraded accuracy and interference issues.
Innovation Solution
A method where User Equipment (UE) receives and compares bandwidth information from serving and neighbor cells, adjusts parameters based on the largest or smallest bandwidth to measure timing differences, and requests gaps to minimize interference, ensuring accurate timing difference measurement by synchronizing or adjusting bandwidths as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing timing difference measurement methods are used, then measurement process is simple, but measurement accuracy degrades due to bandwidth differences between cells
Solution Approach 1:
The patent changes the measurement parameters by introducing bandwidth-dependent configuration parameters including subframe offsets, cyclic shifts, and resource block offsets. These parameters are adjusted based on the specific bandwidth of each cell to ensure accurate timing difference measurements despite bandwidth variations between serving and neighbor cells.
Solution Approach 2:
The patent implements dynamic measurement configurations where the UE adapts measurement parameters based on detected bandwidth differences. The system dynamically selects appropriate subframe offsets, cyclic shifts, and resource block offsets according to the bandwidth characteristics of each cell, making the measurement process flexible and accurate across different bandwidth scenarios.
2Measurement precision
If bandwidth information is exchanged and measurement parameters are adjusted, then timing difference measurement accuracy improves, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by having the network pre-configure bandwidth information and measurement parameters before the UE performs timing difference measurements. The serving cell provides assistance information including neighbor cell bandwidths and corresponding measurement parameters in advance, allowing the UE to properly configure its measurements without real-time coordination complexity.
Solution Approach 2:
The patent uses the serving cell as an intermediary that receives bandwidth information from neighbor cells and translates it into appropriate measurement configurations for the UE. This intermediary role simplifies the overall system complexity by centralizing the coordination function in the serving cell rather than requiring direct UE-neighbor cell bandwidth negotiation.
3Measurement precision
If timing difference measurement is performed without bandwidth adjustment, then device operation is simple, but location calculation accuracy deteriorates
Solution Approach 1:
The patent implements self-service by enabling the UE to autonomously detect bandwidth differences and automatically adjust measurement parameters based on pre-provided assistance information. The UE independently selects appropriate subframe offsets, cyclic shifts, and resource block offsets without requiring complex network coordination during the actual measurement process, maintaining operational simplicity while achieving accurate measurements.
4Measurement precision
If bandwidth synchronization between cells is implemented, then timing difference measurement accuracy improves, but network coordination complexity increases
Solution Approach 1:
The patent resolves the contradiction by changing parameters rather than forcing bandwidth synchronization. Different bandwidth configurations are permitted for serving and neighbor cells, with each cell using bandwidth-appropriate parameters (subframe offsets, cyclic shifts, resource block offsets) to ensure measurement accuracy without requiring network-wide bandwidth uniformity.
Data Source
AI summary
The present invention provides a method for measuring a location. The method comprises: receiving, by a User Equipment (UE) and from a serving cell, information on a bandwidth allocated for a positioning reference signal (PRS); receiving, by the User Equipment (UE) and from at least one or more neighbor cells, information on a bandwidth allocated for a PRS; determining whether there is a difference between the bandwidths; and measuring, by the UE and based on a result of the determination a timing difference between PRSs transmitted from the serving cell and the at least one or more neighbor cells.