Base Station Semi-Persistent Scheduling Cyclic Shift
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Solution Overview
Problem
In communication systems, when uplink data transmission uses semi-persistent scheduling, different user equipments cannot perform data transmission on the same time and frequency resource, leading to reduced spectrum utilization efficiency.
Innovation Solution
A method where the base station determines and sets a value for the user equipment to determine a cyclic shift value of its reference signal sequence, ensuring different UEs have distinct cyclic shift values for uplink reference signal sequences, allowing them to transmit on the same time and frequency resource, by using additional fields on the physical downlink control channel or carrier indicator fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If semi-persistent scheduling is used for uplink data transmission, then scheduling efficiency is improved, but multiple user equipments cannot transmit on the same time and frequency resource
Solution Approach 1:
The patent changes the parameter of cyclic shift value for reference signal sequences to enable multiple UEs to share the same time and frequency resources. By dynamically adjusting the cyclic shift parameter based on UE identification information, the system allows multiple users to transmit simultaneously while maintaining signal distinguishability through different cyclic shift values.
2Reliability
If different cyclic shift values are assigned to different UEs, then orthogonality of reference signals is maintained, but additional signaling overhead is required
Solution Approach 1:
Instead of directly signaling the cyclic shift value to each UE, the patent inverts the approach by using the UE's identification information (which the UE already possesses) to determine the cyclic shift value through a predefined mapping relationship. This eliminates the need for additional downlink signaling while maintaining the ability to assign distinct cyclic shift values to different UEs.
3Productivity
If multiple UEs transmit on the same resource with different cyclic shifts, then spectrum utilization improves, but channel estimation complexity increases
Solution Approach 1:
The patent uses parameter changes (cyclic shift values) to orthogonalize reference signals from multiple UEs, allowing them to share the same time-frequency resources. The base station leverages the known cyclic shift values to separately estimate channels for each UE by processing received signals with corresponding cyclic shift compensations, maintaining manageable complexity while achieving multi-user transmission.
Data Source
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AI summary
The present invention discloses a data transmission method, a base station, and a communication system, which are applied in the communication field. The method includes: determining to perform semi-persistent scheduling on data of a user equipment; setting a value of first information for the user equipment, so that the user equipment determines a cyclic shift value of a reference signal sequence of the user equipment according to the value of the first information; and obtaining the reference signal sequence of the user equipment, performing channel estimation according to the reference signal sequence of the user equipment, and performing demodulation on data information of the user equipment according to a channel coefficient obtained by performing the channel estimation. According to the present invention, when uplink data transmission is performed by adopting a semi-persistent scheduling manner, different user equipments can perform data transmission on a same time and frequency resource, which improves spectrum utilization efficiency.