Uplink Joint Processing Timing Compensation via Channel Matrix
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Solution Overview
Problem
In wireless communication systems, joint processing of uplink data from user equipment to coordinated reception points is hindered by differing propagation delays, which exceed the cyclic prefix length in OFDM transmission, leading to reduced throughput due to the need for an extended cyclic prefix or interference issues with normal prefixes.
Innovation Solution
Estimate and compensate for individual propagation delays across coordinated reception points by modifying the channel matrix associated with uplink channels, allowing joint processing without increasing cyclic prefix length, by performing timing offset estimation in both serving and non-serving cells and adjusting channel coefficients to account for timing differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an extended cyclic prefix is used to accommodate propagation delay differences, then joint processing becomes possible, but system throughput decreases due to increased overhead
Solution Approach 1:
The patent changes the parameter of cyclic prefix length from extended to normal by introducing a different compensation mechanism. Instead of using a longer cyclic prefix to cover propagation delays, the system estimates propagation delays and compensates for them by adjusting the channel matrix, allowing normal cyclic prefix length to be used while maintaining joint processing capability.
Solution Approach 2:
The patent introduces propagation delay estimation and compensation as an intermediary mechanism between the transmitted signal and the channel matrix processing. This intermediary step estimates the timing offsets caused by different propagation delays and compensates for them in the channel matrix, eliminating the need for extended cyclic prefix.
2Productivity
If normal cyclic prefix is used to maintain throughput, then overhead is reduced, but joint processing fails when propagation delays exceed cyclic prefix length
Solution Approach 1:
The patent changes the approach from modifying cyclic prefix length to modifying the channel matrix parameters. By estimating propagation delays and compensating through channel matrix adjustment, the system maintains normal cyclic prefix length (preserving throughput) while enabling joint processing capability.
Solution Approach 2:
The patent performs preliminary propagation delay estimation and compensation before joint processing. By estimating the timing offsets in advance and compensating for them in the channel matrix, the system prepares the data structure to accommodate propagation delay differences without requiring extended cyclic prefix.
3Measurement precision
If timing compensation is performed by adjusting processing window position, then propagation delay to serving cell is compensated, but timing differences between multiple cells remain unaddressed
Solution Approach 1:
The patent merges the timing compensation for serving cell and non-serving cells into a unified channel matrix compensation approach. Instead of separately handling serving and non-serving cell timing, the system estimates propagation delays for all cells and compensates for them collectively through channel matrix modification, enabling multi-cell joint processing.
Solution Approach 2:
The patent creates a universal compensation mechanism that handles timing differences for both serving and non-serving cells through the same channel matrix approach. The channel matrix compensation method is universally applicable to all reception points in the coordination cluster, regardless of whether they are serving or non-serving cells.
Data Source
AI summary
The invention relates to a method for joint processing of uplink data (g(n), s(n)) transmitted from at least one user equipment (UE1, UE2) to a plurality of coordinated reception points (BSA, BSB) of a wireless communication system (1), the method comprising: estimating and preferably compensating for individual propagation delays of the uplink data (g(n), s(n)) transmitted from one of the user equipments (UE1, UE2) to the coordinated reception points (BSA, BSB), and compensating a timing difference between a propagation delay of a coordinated reception point (BSA, BSB) which serves the user equipment (UE1, UE2) and at least one propagation delay of at least one coordinated reception point (BSB, BSA) which does not serve the user equipment (UE1, UE2) for performing the joint processing of the uplink data (g(n), s(n)), wherein the step of compensating the timing difference comprises modifying a channel matrix (H) associated with uplink channels from the at least one user equipment (UE1, UE2) to the coordinated reception points (BSA, BSB). The invention also relates to a processing arrangement (BSA, BSB, 2) adapted for performing the method.