TPI Combining Window Timing for Uplink DPCCH Synchronization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In multi-antenna closed loop transmit diversity systems, the uncertainty in the timing relationship between the dedicated physical control channel (DPCCH) and the fractional transmitted precoding indicator channel (F-TPICH) leads to the use of an untimely transmitted precoding indicator (TPI), resulting in poor demodulation performance for user equipment (UE).
Innovation Solution
A method where a terminal and network-side device determine an offset position for the downlink fractional dedicated physical channel (F-DPCH) and fractional transmitted precoding indicator channel (F-TPICH) to establish a TPI combining window, ensuring the effective position of the TPI is at the timeslot boundary of the first uplink DPCCH after the end boundary of the TPI combining window, thereby using a timely TPI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the UE applies TPI information without considering timing relationship between DPCCH and F-TPICH, then the processing is simple, but the effective position of TPI is uncertain resulting in poor demodulation performance
Solution Approach 1:
The patent determines the TPI combining window position in advance by calculating the timing relationship between DPCCH and F-TPICH channels. This preliminary determination ensures that the TPI is applied at the correct timeslot boundary, resolving the uncertainty in effective position while maintaining straightforward processing procedures.
2Device complexity
If the UE combines TPIs from multiple cells without timing alignment, then the combining operation is straightforward, but the TPI used may not be timely resulting in poor demodulation performance
Solution Approach 1:
The patent establishes the TPI combining window position beforehand by determining the timing relationship between channels. This allows the UE to combine TPIs from multiple cells within the correctly positioned window, ensuring both timeliness and maintaining relatively simple combining operations.
Solution Approach 2:
The TPI combining window acts as an intermediary time interval that mediates between the F-TPICH channel and the DPCCH channel. By defining this intermediate window with specific timing relationship, the patent ensures proper synchronization and timeliness of TPI application while facilitating the combining operation.
3Device complexity
If the timing relationship between DPCCH and F-TPICH is uncertain, then channel synchronization is simpler, but the effective position of TPI becomes uncertain
Solution Approach 1:
The patent preliminarily determines the timing relationship between DPCCH and F-TPICH channels to establish the TPI combining window position. This advance determination ensures precise identification of the TPI effective position at the timeslot boundary of the first uplink DPCCH after the end boundary of the TPI combining window, achieving high measurement precision while keeping synchronization relatively simple.
Data Source
AI summary
Embodiments of the present invention relate to a precoding indicator combining method, a terminal and a network-side device. The method includes: receiving, by a terminal and from a network-side device, an offset position of a downlink fractional dedicated physical channel F-DPCH or a downlink dedicated physical channel DPCH of at least one cell, and an offset position of a downlink fractional transmitted precoding indicator channel F-TPICH of at least one cell; and determining, by the terminal, a transmitted precoding indicator TPI combining window of the cell, so that an effective position of a TPI is located at a timeslot boundary of the first uplink dedicated physical control channel DPCCH after an end boundary of the TPI combining window, thereby enabling a UE to use a timely TPI and improving demodulation performance of the UE for sending data.