Uplink Virtual Resource Frequency Hopping for PUSCH Collision Avoidance
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Solution Overview
Problem
In wireless communication systems, particularly in LTE with carrier aggregation, ensuring UL data transmission without collision while maintaining frequency domain diversity gain is challenging due to different frame structure configurations across Component Carriers, leading to increased costs and power control issues.
Innovation Solution
The method involves determining UL virtual resources allocated by the eNB and processing them with frequency hopping in a preset frequency domain, ensuring that UL data is transmitted using UL physical resources that avoid collisions with existing PUSCH channels by mapping resources within the PUSCH R1 area after frequency hopping, even when frame structures differ between carriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frequency hopping is applied to UL data transmission in type II UL sub-frames, then frequency domain diversity gain is achieved, but collision with PUSCH channels in non-R1 area occurs
Solution Approach 1:
The patent segments the frequency domain into two distinct areas: PUSCH R1 area and non-R1 area. By dividing the frequency resources this way, the system can apply frequency hopping within the R1 area without causing collisions with channels in the non-R1 area, thus maintaining frequency diversity while avoiding harmful collisions.
Solution Approach 2:
The patent applies different resource allocation rules to different frequency regions. Specifically, frequency hopping is enabled and protected in the PUSCH R1 area, while the non-R1 area maintains its original channel structure. This local differentiation allows frequency diversity gain in R1 without affecting or colliding with channels in non-R1.
2Adaptability or versatility
If multiple CCs with different frame structure configurations are aggregated, then system capacity and flexibility are enhanced, but timing relationship design and resource collision issues arise
Solution Approach 1:
The patent creates a universal resource allocation framework that works across multiple CCs with different frame structure configurations. By defining type I and type II UL sub-frames with specific rules, the system provides a multi-functional solution that handles both TDD and FDD configurations, as well as various frame structure types, through a unified approach.
Solution Approach 2:
The patent manages complexity by changing and standardizing key parameters: defining specific sub-frame types (type I with ACK/NACK, type II without), establishing fixed timing relationships (K values), and creating dedicated frequency areas (R1 and non-R1). These parameter standardizations allow flexible carrier aggregation while maintaining manageable complexity through consistent rules.
3Productivity
If ACK/NACK information is fed back in all UL sub-frames, then downlink throughput is improved, but uplink overhead and power consumption increase
Solution Approach 1:
Instead of requiring ACK/NACK feedback in all UL sub-frames, the patent applies partial action by enabling feedback only in type I UL sub-frames. This selective approach provides sufficient feedback for downlink throughput improvement while significantly reducing uplink overhead and power consumption compared to continuous feedback in every sub-frame.
Data Source
AI summary
The present invention provides a UL data transmission method in a wireless communication system, including determining, by the UE, UL virtual resources allocated to the UE by the eNB according to Downlink Control Information (DCI) used for scheduling UL physical resources sent from the eNB to the UE; determining, by the UE, the UL physical resources used for transmitting the UL data after frequency hopping processing in a preset frequency domain when determining that the UL data needs to be processed with frequency hopping processing according to the DCI, if the UL virtual resources allocated to the UE locate at UL sub-frames in a non-aggregation K of any wireless frame, and locate at the preset frequency domain; bearing, by the UE, the UL data and feeding the UL data back to the eNB utilizing the determined UL physical resources which are processed with the frequency hopping processing and used for transmitting the UL data. With the present invention, the PUSCH channel resource collision may be avoided, the frequency diversity gain may be maximized, and the PUSCH performances may be enhanced.