Communication system and method with raised communication efficiency

Abstract

A mobile communication system capable of increasing communication efficiency and a method therefor are provided, including a receiver for grouping n MCS levels into continuous m MCS levels according to the quality of a data channel for transmitting an information signal, and sending information on an MCS group using a pilot signal; and a transmitter for storing information on the n MCS levels, extracting the m MCS levels according to the information on the MCS group transmitted from the receiver, determining one of the extracted m MCS levels as an initial MCS level, modulating and coding information data to be transmitted according to the initial MCS level and transmitting the result to the receiver, and changing the current MCS level in response to the ACK or the NACK signal. In the mobile communication system, the receiver transmitted the glancing channel information to the transmitter, therefore, compared to the CPICH, the feedback information quantity is small and the transmitting periods is long. Consequently, the invention can reduce the delay of channel information and predigest the configuration of the receiver, and cost less time to achieve the best MCS level than the CRC method.

Description

technical field [0001] The present invention relates to a mobile communication system, in particular to a mobile communication system and method capable of increasing communication efficiency by using an AMC (Adaptive Modulation and Coding, Adaptive Modulation and Coding) scheme. Background technique [0002] In order to transmit a large amount of data into a wireless channel environment, it is necessary to transmit information about the current channel obtained from a receiver to a transmitter at a precise time. Like this, it is possible to change the modulation method and coding method according to the current channel situation, and transmit a large amount of data without data loss. Here, more attention is focused on how to send channel-related information from the receiver to the transmitter with the minimum amount of feedback bits, and during the sending process, there is no error or delay, thus saving wireless channel resources. Also, using the channel information tran...

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Problems solved by technology

[0015] As a result, in general mobile communication systems, uplink frequency resources are wasted due to many feedback information related to channel quality and frequent reporting in channel information

Also, due to feedback errors and delays in sending feedback information, it is difficult for the transmitter to correct the channel information at the desired time

In addition, the MCS level cannot be adjusted to correspond to the current channel quality until information is exchanged between sender and receiver for a considerable time

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