Method and device for applying adaptive link in communication system
Provided are a method and an apparatus of transceiving a signal using a link adaptation in a communication system, particularly, a method of dividing a resource region into a plurality of resource regions, and applying different line adaptations to the resource regions. A method of controlling a link of a terminal in a mobile communication system receives at least two downlink channel signals to estimate states of received channels, generates a channel discrepancy report when states of channels exceed a preset threshold, and reports the channel discrepancy report to a base station through a preset uplink channel. A method of controlling a link of a base station receives a channel discrepancy report through an uplink channel, and determines MCS and transmission power of downlink channels based on the received channel discrepancy report and transmits the determined MCS and transmission power to the terminal through a downlink channel.
1. A method of controlling link adaptation of a terminal in a mobile communication system, the method comprising:
measuring channel states of a first region and a second region of downlink, respectively, to generate channel state information of the first region and the second region of downlink;
determining whether a channel discrepancy report occurs based on the channel state information of the first region and the second region of downlink;
generating the channel discrepancy report including information on the difference between channel state information of the first region and the second region, if it is determined whether the channel discrepancy report occurs; and
transmitting the channel state information including the channel discrepancy report to a base station through a preset uplink channel.
2. The method of claim 1 , wherein the first region is a control channel region and the second region is a data channel region.
3. The method of claim 2 , wherein the determining of whether the channel discrepancy report occurs comprises determining that the channel discrepancy report occurs:
if a difference between the channel state information of the first region and the channel state information of the second region is equal to or greater than a preset threshold,
if the difference between the channel state information of the first region and the channel state information of the second region is a preset threshold greater than a finally reported value,
if a channel state information of the control channel is not in a preset threshold range, or
if a time transmitting the channel discrepancy report to the base station elapses by greater than a preset time.
4. The method of claim 3 , wherein the channel discrepancy report comprises at least one of:
a dB scale or a linear scale according to the channel state difference between the first region and the second region, or
a value quantizing the channel state difference between the first region and the second region, or preference MCS level and/or transmission power.
5. The method of claim 4 , further comprising transmitting the measured channel state information of the second region if the channel discrepancy report does not occur.
6. The method of claim 5 , wherein the transmitting of the channel state information comprises transmitting the channel discrepancy report through a data channel of uplink and transmitting the channel state information of the second region through a control channel of uplink.
7. A method of controlling link adaptation of a terminal in a mobile communication system, the method comprising:
receiving channel state information from a terminal;
analyzing a channel discrepancy report including information on the difference between channel state information of the first region and the second region, and compensating for a channel discrepancy value to determine downlink quality of a first region and a second region if the channel discrepancy report is included in the received channel state information; and
controlling transmission of a downlink channel corresponding to the determined downlink quality of the first region and the second region.
8. The method of claim 7 , wherein determining of downlink quality of a first region and a second region comprises:
determining the downlink quality of the first region using a difference between the channel state information of the first region and the channel state information of the second region, and
determining the downlink quality of the second region using channel state information of the second region, if the channel discrepancy report includes the difference between the channel state information of the first region and the channel state information of the second region and the channel state information of the second region.
9. The method of claim 8 , wherein the first region is a control channel of downlink, and the second region is a data channel of the downlink.
10. The method of claim 9 , further comprising determining downlink quality according to received channel state information of the second region if the channel discrepancy report is not included in the received channel state information.
11. An apparatus of controlling link adaptation of a terminal in a mobile communication system, the apparatus comprising:
a first channel state estimator configured to measure a channel state of a first region in downlink to generate channel state information of the first region;
a second channel state estimator configured to measure a channel state of a second region in the downlink to generate channel state information of the second region;
a controller configured:
to determine whether a channel discrepancy report occurs based on the channel state information of the first region and the second region of downlink, and
to generate the channel discrepancy report including information on the difference between channel state information of the first region and the second region, if it is determined whether the channel discrepancy report occurs; and
a transmitter configured to transmit the channel state information including the channel discrepancy report to a base station through a preset uplink channel.
12. The apparatus of claim 11 , wherein the controller is further configured to determine that the channel discrepancy report occurs:
if a difference between the channel state information of the first region and the channel state information of the second region is equal to or greater than a preset threshold,
if the difference between the channel state information of the first region and the channel state information of the second region is a preset threshold greater than a finally reported value,
if a channel state information of the control channel is not in a preset threshold range, or
if a time transmitting the channel discrepancy report to the base station elapses by greater than a preset time.
13. The apparatus of claim 12 , wherein the channel discrepancy report generated from the controller comprises at least one of:
a dB scale or a linear scale according to the difference between the channel state of the first region and the channel state of the second region, or
a value quantizing the channel state difference between the first region and the second region, or preference MCS level and/or transmission power.
14. The apparatus of claim 13 , wherein the controller is further configured to transmit the measured channel state information of the second region if the channel discrepancy report does not occur.
15. The apparatus of claim 14 , wherein the first region is a downlink control channel, and the second region is a downlink data channel.
16. An apparatus of controlling link adaptation of a base station in a mobile communication system, the apparatus comprising:
a downlink receiver configured to receive channel state information from a terminal;
a controller configured:
to analyze a channel discrepancy report including information on the difference between channel state information of the first region and the second region, and
to compensate for a channel discrepancy value to determine downlink quality of a first region and a second region if a channel discrepancy report is included in the received channel state information; and
a downlink transmitter configured to control transmission of a corresponding downlink channel according to the determined downlink quality of the first region and the second region.
17. The apparatus of claim 16 , wherein the controller is further configured to:
determine the downlink quality of the first region using a difference of between the channel state information of the first region and the channel state information of the second region, and
determine the downlink quality of the second region using channel state information of the second region, if the channel discrepancy report includes the difference between the channel state information of the first region and the channel state information of the second region and the channel state information of the second region.
18. The apparatus of claim 17 , wherein the first region is a control channel of downlink, and the second region is a data channel of the downlink.
19. The apparatus of claim 18 , wherein the controller is further configured to determine downlink quality according to received channel state information of the second region if the channel discrepancy report is not included in the received channel state information.