Method of transmitting and receiving MIMO feedback information in wireless communication system, mobile station and base station

Abstract

A method of transmitting an MIMO (multiple input multiple output) feedback information, which is transmitted by a mobile station in a wireless communication system, is disclosed. The present invention includes sending a ranging request message to a base station and receiving a ranging response message from the base station in response to the ranging request message, wherein the mobile station comprises a fixed M2M (machine to machine) device and wherein the ranging request message contains the MIMO feedback information.

The invention claimed is: 
     
       1. A method of transmitting feedback information by a device in a wireless communication system, the method comprising:
 transmitting a ranging request message by the device which is a fixed station to a base station, the ranging request message comprising the feedback information which is to be used for a multiple input multiple output (MIMO) scheme; and 
 receiving a ranging response message from the base station in response to the ranging request message, 
 wherein the feedback information comprises a MIMO feedback mode (MFM) bitmap, each bit of the MFM bitmap indicating a deallocation or a reallocation of a corresponding MIMO feedback mode to be used by the device, 
 wherein when a first least significant bit (LSB) is equal to “1,” the feedback information further comprises a wideband channel quality indicator (CQI) which indicates an average value of CQIs across a whole band, and a wideband space time coding (STC) indicator which indicates a wideband STC rate, and 
 wherein when a second LSB is equal to “1,” the feedback information further comprises the wideband CQI, the wideband STC indicator, and a wideband preferred matrix index (PMI) indicator which indicates a wideband PMI. 
 
     
     
       2. The method of  claim 1 , wherein the device is a machine to machine (M2M) device which does not require human interactions to perform communications with another device. 
     
     
       3. The method of  claim 1 , further comprising transmitting a ranging code by the device to the base station to initiate a network entry or a network reentry before transmitting the ranging request. 
     
     
       4. A device for transmitting feedback information in a wireless communication system, the device comprising:
 a transmitter configured to transmit a ranging request message to a base station, the ranging request message comprising the feedback information which is to be used for a multiple input multiple output (MIMO) scheme, wherein the device is a fixed station; and 
 a receiver configured to receive a ranging response message from the base station in response to the ranging request message, 
 wherein the feedback information comprises a MIMO feedback mode (MFM) bitmap, each bit of the MFM bitmap indicating a deallocation or a reallocation of a corresponding MIMO feedback mode to be used by the device, 
 wherein when a first least significant bit (LSB) is equal to “1,” the feedback information further comprises a wideband channel quality indicator (CQI) which indicates an average value of CQIs across a whole band, and a wideband space time coding (STC) indicator which indicates a wideband STC rate, and 
 wherein when a second LSB is equal to “1,” the feedback information further comprises the wideband CQI, the wideband STC indicator, and a wideband preferred matrix index (PMI) indicator which indicates a wideband PMI. 
 
     
     
       5. The device of  claim 4 , wherein the device is a machine to machine (M2M) device which does not require human interactions to perform communications with another device. 
     
     
       6. A method of receiving feedback information by a base station in a wireless communication system, the method comprising:
 receiving a ranging request message from a device which is a fixed station, the ranging request message comprising the feedback information which is to be used for a multiple input multiple output (MIMO) scheme; and 
 transmitting a ranging response message to the device in response to the ranging request message, 
 wherein the feedback information comprises a MIMO feedback mode (MFM) bitmap, each bit of the MFM bitmap indicating a deallocation or a reallocation of a corresponding MIMO feedback mode to be used by the device, 
 wherein when a first least significant bit (LSB) is equal to “1,” the feedback information further comprises a wideband channel quality indicator (CQI) which indicates an average value of CQIs across a whole band, and a wideband space time coding (STC) indicator which indicates a wideband STC rate, and 
 wherein when a second LSB is equal to “1,” the feedback information further comprises the wideband CQI, the wideband STC indicator, and a wideband preferred matrix index (PMI) indicator which indicates a wideband PMI. 
 
     
     
       7. The method of  claim 6 , wherein the device is a machine to machine (M2M) device which does not require human interactions to perform communications with another device. 
     
     
       8. A base station for receiving feedback information in a wireless communication system, the base station comprising:
 a receiver configured to receive a ranging request message from a device which is a fixed station, the ranging request message comprising the feedback information which is to be used for a multiple input multiple output (MIMO) scheme, wherein the device is a fixed station; and 
 a transmitter configured to transmit a ranging response message to the device in response to the ranging request message, 
 wherein the feedback information comprises a MIMO feedback mode (MFM) bitmap, each bit of the MFM bitmap indicating a deallocation or a reallocation of a corresponding MIMO feedback mode to be used by the device, 
 wherein when a first least significant bit (LSB) is equal to “1,” the feedback information further comprises a wideband channel quality indicator (CQI) which indicates an average value of CQIs across a whole band, and a wideband space time coding (STC) indicator which indicates a wideband STC rate, and 
 wherein when a second LSB is equal to “1,” the feedback information further comprises the wideband COI, the wideband STC indicator, and a wideband preferred matrix index (PMI) indicator which indicates a wideband PMI.