Method for determining a modulation and coding scheme in a broadband wireless access system

摘要

The present invention relates to a broadband wireless access system, and more particularly, to a method in which a terminal determines a modulation and coding scheme (MCS) of uplink allocation information received from a base station under a condition such as that of a random access process in which both the terminal and the base station do not know each other's channel state. According to one exemplary embodiment of the present invention, a method of transmitting data comprises: receiving, from the base station, uplink allocation information for indicating an uplink resource for transmitting the specific data: determining a lowest modulation and coding scheme (MCS) to be applied to the specific data using information on the size and allocation size of the specific data; and transmitting to the base station via the uplink source, the specific data to which the determined MCS is applied.

主权项

1. 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; anddetermining 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 ANDBidx(byte)KFB161281391410151116121713181519171101911122112251132711431115361164011744118501195712064121711228012390124100125114126128127144128164129180130204131232132264133296134328135368136416137472138528139600140656241736242832243944244105624512002461416347158434818003491888450211245124004522640553300055436006554200756480085754009586000105966001160720012617800136284001463960016641080018651200020661440024 and wherein “idx” re resents the first index and “NDB” represents the maximum size of the ranging request message.