Patent ID: 8750229

Claim:
A method for transmitting a ranging request message during a ranging procedure by a mobile terminal in a situation that a base station is not aware of a channel status of the mobile terminal, the method comprising: receiving an allocation size corresponding to the ranging request message from the base station, wherein the allocation size indicates a number of LRUs (Logical Resource Units); determining a modulation and coding scheme (MCS) of the ranging request message using a maximum size of the ranging request message and the allocation size, wherein the maximum size of the ranging request message is determined depending on a purpose of the ranging procedure, wherein the step of determining the MCS comprises: selecting a first index mapped to the maximum size of the ranging request message and a second index mapped to the allocation size; and determining the MCS using a third index obtaining by subtracting the second index from the first index; and transmitting the determined MCS applied ranging request message to the base station, wherein the purpose of the ranging procedure comprises a handover process or an initial network entry, wherein the first index is selected from Table A, shown below, using the size of the request message: TABLE A N DB idx (byte) K FB 1 6 1 2 8 1 3 9 1 4 10 1 5 11 1 6 12 1 7 13 1 8 15 1 9 17 1 10 19 1 11 22 1 12 25 1 13 27 1 14 31 1 15 36 1 16 40 1 17 44 1 18 50 1 19 57 1 20 64 1 21 71 1 22 80 1 23 90 1 24 100 1 25 114 1 26 128 1 27 144 1 28 164 1 29 180 1 30 204 1 31 232 1 32 264 1 33 296 1 34 328 1 35 368 1 36 416 1 37 472 1 38 528 1 39 600 1 40 656 2 41 736 2 42 832 2 43 944 2 44 1056 2 45 1200 2 46 1416 3 47 1584 3 48 1800 3 49 1888 4 50 2112 4 51 2400 4 52 2640 5 53 3000 5 54 3600 6 55 4200 7 56 4800 8 57 5400 9 58 6000 10 59 6600 11 60 7200 12 61 7800 13 62 8400 14 63 9600 16 64 10800 18 65 12000 20 66 14400 24 and wherein “idx” re resents the first index and “N DB ” represents the maximum size of the ranging request message.