Base Station Uplink Control Signal for Reception Quality Information
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Solution Overview
Problem
Current mobile communication systems lack efficient methods for controlling the transmission of reception quality information from mobile station apparatuses to base station apparatuses, particularly in terms of information amount and frequency, leading to resource wastage and inefficiencies in uplink resource management.
Innovation Solution
The system involves the base station apparatus transmitting an uplink data transmission permission signal with simultaneous transmission permission information to the mobile station apparatus, allowing for simultaneous transmission of reception quality information and uplink data using either the uplink control channel or data channel, with flexible modulation and coding schemes, and specifying physical formats to optimize resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If mobile station apparatus transmits reception quality information frequently and with large information amount, then the base station apparatus can perform accurate adaptive modulation and coding and frequency selective scheduling, but uplink resources are wasted and resource management becomes inefficient
Solution Approach 1:
The patent implements dynamic control of reception quality information transmission by allowing the base station to send uplink data transmission permission signals that conditionally trigger CQI transmission. The mobile station transmits reception quality information only when permission is granted, making the transmission frequency and timing adaptive rather than fixed, thus optimizing uplink resource usage while maintaining necessary measurement precision
Solution Approach 2:
The patent changes the transmission parameters of reception quality information by controlling both the frequency and physical format (PUCCH or PUSCH) based on uplink resource availability and data transmission needs. The base station dynamically adjusts whether the mobile station transmits CQI on PUCCH or PUSCH, and at what frequency, thereby optimizing the balance between measurement accuracy and resource efficiency
2Reliability
If mobile station apparatus transmits reception quality information using dedicated uplink control channel (PUCCH), then transmission reliability is ensured, but uplink data transmission capacity is reduced
Solution Approach 1:
The patent makes the uplink data channel (PUSCH) serve dual purposes: transmitting both uplink data and reception quality information (CQI) simultaneously when permission is granted. This multi-functional approach allows the system to maintain reliable CQI transmission while utilizing the larger capacity of the data channel, thereby preserving uplink data transmission capacity that would otherwise be lost to dedicated control channel usage
3Quantity of substance
If mobile station apparatus transmits reception quality information using uplink data channel (PUSCH), then uplink data transmission capacity is maintained, but transmission reliability and timing control become less certain
Solution Approach 1:
The patent implements preliminary control by having the base station send uplink data transmission permission signals before the mobile station transmits CQI on PUSCH. This advance permission mechanism ensures that CQI transmission is coordinated with uplink data transmission timing, guaranteeing that the reception quality information reaches the base station reliably and at the appropriate time, while still utilizing the capacity-efficient PUSCH channel
4Productivity
If base station apparatus performs frequency selective scheduling based on detailed channel quality information, then spectrum efficiency is improved, but system complexity increases
Solution Approach 1:
The patent implements partial action by having the mobile station transmit reception quality information only for specific subcarriers or frequency regions when permission is granted, rather than continuously reporting all channel quality data. The base station performs frequency selective scheduling based on this selective CQI feedback, achieving improved spectrum efficiency through targeted frequency allocation while reducing system complexity compared to continuous full-bandwidth CQI reporting
Data Source
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AI summary
A mobile communication system in which a mobile station apparatus transmits, to a base station apparatus, uplink data using a physical uplink shared channel assigned by an uplink data transmission permission signal, wherein the base station apparatus: transmits, to the mobile station apparatus, a radio resource control signal including a transmission instruction of reception quality information; and transmits, to the mobile station apparatus, the uplink data transmission permission signal including a transmission instruction of reception quality information, and wherein the mobile station apparatus: periodically transmits, to the base station apparatus, first reception quality information according to a transmission instruction of the reception quality information included in the radio resource control signal; and transmits, to the base station apparatus, second reception quality information using the physical uplink shared channel in case that a transmission instruction of the reception quality information is included in the uplink data transmission permission signal.