Measurement Pilot Signal Transmission on Partial Bandwidth
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Solution Overview
Problem
In LTE systems, transmitting a downlink measurement pilot signal on full bandwidth is inefficient, especially as system bandwidth grows, and there is a need for transmitting user data using partial bandwidth in future 5G communications systems, requiring an effective method to transmit measurement pilot signals on partial system bandwidth.
Innovation Solution
The method involves dividing the system bandwidth into subbands, determining a specific subband for transmitting the measurement pilot signal, sending identifier information to the second device, and embedding the signal in the corresponding physical resource block, allowing the second device to demodulate the signal based on the identifier.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the downlink measurement pilot signal is transmitted on full bandwidth in LTE systems, then the channel state information estimation is accurate, but the signaling overhead increases and resource allocation flexibility decreases
Solution Approach 1:
The system bandwidth is divided into multiple subbands, and the measurement pilot signal is transmitted only on selected subbands rather than the entire bandwidth. This segmentation allows the patent to maintain adequate channel estimation accuracy for the allocated resources while significantly reducing the quantity of pilot signals that need to be transmitted and processed.
Solution Approach 2:
The patent applies different transmission qualities to different frequency regions by selecting specific subbands for pilot signal transmission. Instead of uniform full-bandwidth transmission, the system concentrates pilot signals in local frequency regions where they are most needed, optimizing the trade-off between measurement precision and signaling overhead.
2Reliability
If the downlink measurement pilot signal is transmitted on full bandwidth, then comprehensive channel coverage is achieved, but resource allocation flexibility for user data transmission is reduced
Solution Approach 1:
By segmenting the bandwidth into subbands and selectively activating only those subbands where user data is transmitted, the patent maintains reliable channel coverage for active resources while freeing up other frequency resources for flexible allocation to different users or services.
Solution Approach 2:
The patent transmits measurement pilot signals only partially, i.e., only on the subbands where user data is actually transmitted, rather than excessively covering the entire bandwidth. This partial action approach maintains sufficient reliability for active channels while improving resource allocation flexibility.
3Measurement precision
If measurement pilot signals are embedded in every PRB on system bandwidth, then precise channel estimation is achieved, but system complexity and processing overhead increase
Solution Approach 1:
The patent segments the PRBs into subbands and performs channel estimation only on the subbands where pilot signals are transmitted. This reduces the number of PRBs that need to be processed for channel estimation, thereby reducing system complexity and processing overhead while maintaining precision for the active resources.
Solution Approach 2:
The patent extracts and removes the unnecessary pilot signal transmissions from PRBs that do not carry user data. By taking out the redundant pilot signals from inactive subbands, the system reduces processing complexity without sacrificing channel estimation precision for the active user data transmissions.
Data Source
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AI summary
This application discloses a method and a device for transmitting a measurement pilot signal. The method includes: determining, by a first device from a plurality of subbands included in system bandwidth, a first subband that is used to transmit a measurement pilot signal, where one subband includes at least one physical resource block; sending, by the first device, identifier information of the first subband to a second device; and embedding, by the first device, the measurement pilot signal in at least one physical resource block corresponding to the first subband, and transmitting the measurement pilot signal to the second device. With the method and the device in this application, a measurement pilot signal can be transmitted on some physical resource blocks of entire system bandwidth.