Method of transmitting a antenna control signal
An antenna switching method in a wireless access system is disclosed. A method of transmitting antenna information according to one embodiment of the present invention includes the steps of receiving an uplink request message for closed-loop antenna switching from a mobile station, transmitting a reference field including prescribed modulation and coding scheme (MCS) information to the mobile station, and transmitting a differential field including the antenna information to the mobile station. In this case, the antenna information can contain a selected antenna index.
1. A method of transmitting antenna information, comprising the steps of:
receiving an uplink request message for closed-loop antenna switching from a mobile station;
transmitting a reference field including prescribed modulation and coding scheme (MCS) information to the mobile station; and
transmitting a differential field including the antenna information to the mobile station,
wherein the antenna information contains a selected antenna index.
2. The method of claim 1 , wherein the reference field is transmitted before the differential field is transmitted.
3. The method of claim 2 , wherein the reference field includes modulation and coding scheme (MCS) information in case of using open-loop antenna switching and wherein the differential field includes a field indicating a presence or non-presence of increment/decrement of the MCS information and an offset value for increment/decrement of the MCS level.
4. The method of claim 3 , wherein the reference field is periodically transmitted.
5. The method of claim 2 , wherein the antenna information contains the selected antenna index.
6. The method of claim 2 , wherein the differential field is transmitted each time the MCS information is updated.
7. A method of receiving antenna information, comprising the steps of:
transmitting an uplink request message for closed-loop antenna switching to a base station;
receiving a reference field including prescribed modulation and coding scheme (MCS) information from the base station; and
receiving a differential field including the antenna information from the base station,
wherein the antenna information contains a selected antenna index.
8. The method of claim 7 , wherein the reference field is transmitted before the differential field is transmitted.
9. The method of claim 8 , wherein:
the reference field includes modulation and coding scheme (MCS) information in case of using open-loop antenna switching, and
the differential field includes a field indicating a presence or non-presence of increment/decrement of the MCS information and an offset value for increment/decrement of the MCS level.
10. The method of claim 9 , wherein the reference field is periodically transmitted.
11. The method of claim 8 , wherein the antenna information contains the selected antenna index.
12. The method of claim 8 , wherein the differential field is transmitted each time the MCS information is updated.