Uplink Channel Cyclic Shift Determination for 5G Terminals
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Solution Overview
Problem
Current communication systems, particularly in the context of 5G and beyond, face challenges in efficiently managing uplink channel instances for terminal and base station apparatuses, leading to suboptimal performance in error correction and data transmission due to inadequate cyclic shift determination methods.
Innovation Solution
The proposed solution involves a terminal and base station apparatus that utilize a coder for error correction coding of uplink information, with a rate matcher applying a cyclic shift to generate a second coded bit sequence for each uplink channel instance, where the cyclic shift amount is determined based on previous channel instances, OFDM symbol counts, and higher-layer parameters, optimizing data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed cyclic shift amount is used for all uplink channel instances, then the device complexity is reduced, but the communication efficiency and error correction performance deteriorate
Solution Approach 1:
The cyclic shift amount is changed from a fixed value to a dynamic value that varies according to the uplink channel instance index s. The rate matcher applies different cyclic shift amounts Cs for different uplink channel instances, allowing the system to adapt to varying channel conditions and improve communication efficiency while maintaining manageable device complexity through systematic determination methods.
Solution Approach 2:
The cyclic shift amount parameter Cs is modified based on the uplink channel instance index s and other parameters such as the number of OFDM symbols and coded bits per OFDM symbol. This parameter change enables the system to optimize error correction performance and communication efficiency by adjusting the cyclic shift amount according to specific transmission conditions.
2Reliability
If the cyclic shift amount is determined based on multiple parameters including previous channel instances and OFDM symbol counts, then the error correction performance is improved, but the calculation complexity increases
Solution Approach 1:
The determination of the cyclic shift amount Cs for the s-th uplink channel instance incorporates feedback from the previous (s-1)-th uplink channel instance, specifically using the prescribed amount Cs-1. This feedback mechanism allows the system to maintain consistent error correction performance across multiple transmissions while using a systematic approach that limits calculation complexity.
Solution Approach 2:
The system performs preliminary determination of the cyclic shift amount by establishing a systematic relationship with previous channel instances and transmission parameters. This preliminary action enables the rate matcher to efficiently calculate Cs without requiring complex real-time analysis, thus improving error correction performance while keeping device complexity manageable.
3Adaptability or versatility
If different cyclic shift amounts are applied to different uplink channel instances, then the adaptability to channel conditions is improved, but the device complexity increases
Solution Approach 1:
The cyclic shift amount parameter Cs is dynamically changed for different uplink channel instances based on the instance index s and transmission parameters. This parameter change enables the rate matcher to adapt to varying channel conditions while using a systematic determination method that prevents excessive device complexity.
Solution Approach 2:
The rate matcher is designed to dynamically adjust the cyclic shift amount according to the specific uplink channel instance being processed. This dynamic adaptation allows the system to respond to changing channel conditions while maintaining manageable device complexity through efficient calculation methods based on instance indices and transmission parameters.
Data Source
AI summary
An apparatus includes a coder configured to generate a first coded bit sequence by error correction coding of a bit sequence of uplink control information, a rate matcher configured to generate a second coded bit sequence by applying a prescribed amount Cs of cyclic shift to the first coded bit sequence for an s-th uplink channel instance of S uplink channel instances, and a transmitter configured to transmit the second coded bit sequence by using the s-th uplink channel instance. The prescribed amount Cs is determined based on at least some or all of a prescribed amount Cs−1 for an (s−1)-th uplink channel instance, the number of OFDM symbols included in the (s−1)-th uplink channel instance, and the number Nblockbit of coded bits mapped per OFDM symbol.