HSPA Control Channel Joint Encoding for Four-Branch MIMO
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Solution Overview
Problem
The introduction of four-branch MIMO in HSPA systems requires more power for the control channel, which degrades the performance of the associated data channel and reduces system throughput due to the need for additional bits to report rank and modulation information.
Innovation Solution
Combining rank and modulation information into a common bit pattern for transmission in the control channel, reducing the number of bits required and conserving power resources for the data channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If four-branch MIMO is introduced to increase peak data rates through multi-stream transmission, then system throughput and spectral efficiency are improved, but power consumption of the control channel increases and data channel performance degrades
Solution Approach 1:
The patent combines rank information and modulation information into a single joint encoding scheme. Instead of transmitting these parameters separately through the control channel, the invention merges them into one unified information stream, reducing the total number of bits that need to be transmitted and thereby reducing control channel power consumption while maintaining support for four-branch MIMO operations
2Loss of information
If additional bits are transmitted in the control channel to report rank and modulation information for four-branch MIMO, then transmission parameters are accurately conveyed, but power consumption increases and data channel performance degrades
Solution Approach 1:
The patent applies joint encoding to merge rank information and modulation information into a single compact representation. This combining approach reduces the total bit length required to convey both parameters accurately, thereby maintaining complete control information while reducing the power needed to transmit it through the control channel
3Adaptability or versatility
If the control channel uses more power to transmit additional MIMO control information, then four-branch MIMO operation is enabled, but the associated data channel performance degrades due to power reallocation
Solution Approach 1:
The patent combines multiple control parameters (rank and modulation information) into a single joint encoded message, reducing the overall control channel bit requirement. This reduction in control information length decreases the power needed for control channel transmission, thereby preventing power reallocation from degrading data channel performance while still enabling four-branch MIMO functionality
Data Source
AI summary
The proposed technology relates to a method for conveying information from a node to user equipment, UE, in a HSPA, system. The method comprises the step of obtaining (S1) rank information and modulation information related to a four-branch Multiple Input Multiple Output, MIMO, system. The method also comprises the step of combining (S2) the rank information and the modulation information related to the four-branch MIMO system into a bit pattern, and the step of transmitting (S3) the combined rank information and modulation information related to the four-branch MIMO system as said bit pattern in a control channel to the UE. In this way, a power-efficient solution for conveying information related to a four-branch MIMO system in a control channel from a node to a UE in a HSPA system is provided.