Method for configuring basic signal allocation unit and method for transmitting signals using the same
A method for configurating a basic signal allocation unit and a method of transmitting signals using the configurated basic signal allocation unit are disclosed. In particular, a basic frequency domain signal allocation unit is configurated by considering at least one selected from the group consisting of a signaling overhead, a size of a coherent bandwidth and a number of divisors among specific numbers and an OFDM symbol number corresponding to a multiple of a subframe unit, each of the specific numbers multiplied to a predetermined subcarrier spacing to enable a result value of the multiplication to have a difference smaller than a prescribed threshold from a divisor of a system bandwidth. And, a time domain unit is configurated by 1-subframe unit. Accordingly, signaling overhead can be efficiently reduced.
1. A method of transmitting signals, the method comprising:
segmenting information bits by a basic resource block unit to produce a plurality of basic resource block units;
mapping each of the information bits, for each of the plurality of basic resource block units, to a respective basic resource block; and
mapping information bits of some of the plurality of the basic resource block units according to a localized resource allocation and mapping information bits of other ones of the plurality of the basic resource block units according to a distributed resource allocation,
transmitting the mapped information bits as a transmission signal,
wherein the basic resource block unit comprises “S” consecutive OFDMA symbols corresponding to 1 subframe length in a time domain and “N” consecutive subcarriers in a frequency domain,
wherein the localized resource allocation is defined by allocating the information bits of one basic resource block unit of the plurality of resource block units sequentially over adjacent subcarriers of the “N” consecutive subcarriers,
wherein the distributed resource allocation is defined by allocating the information bits of one basic resource block unit of the plurality of resource block units non-sequentially over adjacent subcarriers of the “N” consecutive subcarriers;
wherein “N” is equal to either 18 or 9, and
wherein “S” is a natural number.
2. The method according to claim 1 ,
wherein the 1 subframe length corresponds to 6 OFDMA symbols, and
wherein “S” is equal to either 6 or 12.
3. The method according to claim 1 , wherein “N” is determined to meet a condition that “N” multiplied by a predetermined subcarrier spacing corresponds to a predetermined divisor of a system bandwidth.
4. The method according to claim 3 ,
wherein the predetermined subcarrier spacing corresponds to 10.9375 kHz, and
wherein the system bandwidth corresponds to 5 MHz, 10 MHz or 20 MHz.
5. The method according to claim 3 , wherein the predetermined divisor of the system bandwidth corresponds to 200 kHz.
6. The method according to claim 1 ,
wherein “S” is equal to 6, and
wherein “N” is equal to 18.
7. A method of transmitting signals, the method comprising:
segmenting information bits by a basic resource block unit to produce a plurality of basic resource block units;
mapping each of the information bits, for each of the plurality of basic resource block units, to a respective basic resource block; and
mapping information bits of some of the plurality of the basic resource block units according to a localized resource allocation and mapping information bits of other ones of the plurality of the basic resource block units according to a distributed resource allocation,
transmitting the mapped information bits as a transmission signal,
wherein the basic resource block unit comprises “S” consecutive OFDMA symbols corresponding to 1 subframe length in a time domain and “N” consecutive subcarriers in a frequency domain,
wherein the localized resource allocation is defined by allocating the information bits of one basic resource block unit of the plurality of resource block units sequentially over adjacent subcarriers of the “N” consecutive subcarriers,
wherein the distributed resource allocation is defined by allocating the information bits of one basic resource block unit of the plurality of resource block units non-sequentially over adjacent subcarriers of the “N” consecutive subcarriers;
wherein a fraction of the basic resource block unit is used for the distributed resource allocation,
wherein “N” is equal to either 18 or 9, and
wherein “S” is a natural number.
8. The method according to claim 7 ,
wherein “S” is equal to 6, and
wherein “N” is equal to 18.
9. The method according to claim 8 , wherein the fraction of the basic resource block unit comprises 6 OFDMA symbols and 9 subcarriers.