PUCCH Uplink Control Signal Multiplexing Using Orthogonal Cover Codes
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently transmitting HARQ-ACK signals and CSI signals simultaneously in the PUCCH, due to limitations in multiplexing capacity and reliability, especially when multiple HARQ-ACK bits are involved, leading to increased cubic metric and the need for maximum power reduction.
Innovation Solution
A method where a User Equipment (UE) transmits HARQ-ACK and CSI signals in the same subframe by using different Orthogonal Cover Codes (OCCs) and summing their outputs, allowing for joint or separate coding based on base station parameters, while maintaining multiplexing capacity and enabling SRS transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ-ACK and CSI signals are transmitted simultaneously in PUCCH using conventional methods, then both signals can be conveyed, but multiplexing capacity is limited and reliability decreases
Solution Approach 1:
The patent applies dimensionality change by moving from time-division multiplexing (separate slots for HARQ-ACK and CSI) to a unified resource block structure where both signals are transmitted simultaneously in the same subframe using different orthogonal cover codes. This transforms the problem from sequential transmission to parallel transmission in the code domain, increasing multiplexing capacity while maintaining reliability through joint coding.
2Loss of information
If multiple HARQ-ACK bits are transmitted, then more acknowledgment information is conveyed, but cubic metric increases and maximum power reduction is required
Solution Approach 1:
The patent merges HARQ-ACK information bits with CSI bits into a single coded transmission stream. Instead of separately encoding and transmitting multiple HARQ-ACK bits (which increases cubic metric and power requirements), the invention combines them with CSI bits and applies joint channel coding, reducing the overall transmission power while maintaining full acknowledgment information capacity.
3Reliability
If HARQ-ACK and CSI are transmitted separately in different slots, then each signal gets dedicated resources, but SRS transmission cannot occur simultaneously and multiplexing capacity is reduced
Solution Approach 1:
The patent creates a universal PUCCH resource block structure that can simultaneously accommodate HARQ-ACK, CSI, and SRS transmissions. By using orthogonal cover codes to separate different signal types within the same resource block, the system achieves multi-functionality where a single resource structure supports multiple transmission types without mutual interference, enabling SRS to be transmitted simultaneously with HARQ-ACK and CSI.
Data Source
AI summary
A method and apparatus of a User Equipment (UE) to simultaneously transmit information of a first type and information of a second type over a number of transmission symbols, the information of the first type and the information of the second type being respectively associated with a first Orthogonal Cover Code (OCC) and a second OCC, wherein a length of each OCC is equal to the number of transmission symbols. The method includes multiplying, at each transmission symbol, the information of the first type with a respective element of the first OCC to obtain a first output; multiplying, at each transmission symbol, the information of the second type with a respective element of the second OCC to obtain a second output; summing the first output and the second output to obtain a combined output; and transmitting the combined output.