PUCCH RI SR Multiplexing Orthogonality
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Solution Overview
Problem
Existing LTE systems face performance degradation due to the lack of a specific method for sending Rank Indication (RI) information and Scheduling Request (SR) information within the same subframe, leading to inter-symbol interference and loss of orthogonality between PUCCH codes.
Innovation Solution
The method involves carrying RI information on a Physical Uplink Control Channel (PUCCH) for transmitting SR information, using modulation techniques like BPSK or QPSK, and mapping the modulated symbols onto target carriers, or sending both RI and SR information using a Physical Uplink Shared Channel (PUSCH) when within the same subframe.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If RI information and SR information are sent within the same subframe using separate PUCCH resources, then both information types can be transmitted simultaneously, but code orthogonality is destroyed and inter-symbol interference occurs
Solution Approach 1:
The patent merges RI information and SR information into a single PUCCH resource for simultaneous transmission. Instead of allocating separate PUCCH resources that would conflict, the invention combines both information types in one resource, using multiplexing techniques to maintain orthogonality while achieving efficient simultaneous transmission.
Solution Approach 2:
The PUCCH resource is designed to serve multiple functions by carrying both RI information and SR information within the same transmission framework. This multi-functional approach allows the system to handle different information types through a unified channel, preventing resource conflicts and maintaining code orthogonality.
2Productivity
If RI information is carried on PUCCH for SR transmission, then simultaneous transmission is enabled, but modulation complexity increases
Solution Approach 1:
The patent segments the modulation process by applying different modulation schemes to different information types within the same PUCCH resource. RI information uses BPSK or QPSK modulation while SR information uses orthogonal codes, allowing the system to handle multiple information types with appropriate modulation complexity for each.
Solution Approach 2:
The invention changes modulation parameters dynamically based on the information type being transmitted. By adjusting modulation schemes (BPSK, QPSK) and orthogonal code assignments according to whether RI or SR information is being sent, the system manages complexity while enabling simultaneous transmission.
Data Source
AI summary
The present invention discloses a method and an apparatus for sending rank indication (RI) information, and a method and an apparatus for receiving RI information, wherein the method for sending the RI information includes: carrying the RI information on a physical uplink control channel (PUCCH) for transmitting scheduling request (SR) information when the RI information and the SR information are sent within a same subframe, and sending the RI information and the SR information by using the PUCCH for transmitting SR information. According to the present invention, the problem that the orthogonality of codes between PUCCHs is destroyed due to that the RI information and the SR information are sent within a same subframe is solved, the overall system performance thereby can be guaranteed.