Method for transmitting and receiving signals based on segmented access scheme and method for allocating sequence for the same
A segmented access based signal transmitting/receiving method and a sequence allocating method for the same are disclosed. According to one embodiment of the present invention, a method of transmitting a signal of a user equipment in a communication system includes selecting a channel in accordance with at least one selected from the group consisting of a signal attenuation extent of a downlink signal to the user equipment and a speed of the user equipment from channels differently provided based on at least one selected from the group consisting of the signal attenuation extent of the downlink signal and the speed of the user equipment and transmitting the signal using the selected channel.
1. A method for transmitting a signal via a random access channel by a specific user equipment (UE), the method comprising:
selecting, by the specific UE, one random access preamble sequence set from among plural predetermined random access preamble sequence sets by considering a size of information to be transmitted by the specific UE and a degree of a path loss,
wherein sequences within the predetermined random access preamble sequence sets are generated by applying a cyclic shift to a CAZAC (Constant Amplitude Zero Auto Correlation) sequence, and
wherein a first number of the sequences and a second number of the sequences are allocated to each of a first and a second random access preamble sequence set within the predetermined random access preamble sequence sets;
randomly selecting, by the specific UE, a specific sequence within the selected one random access preamble sequence set; and
transmitting, by the specific UE, the selected specific sequence via the random access channel.
2. The method of claim 1 , wherein the first number and the second number are differently determined.
3. The method of claim 1 , wherein the sequences within the predetermined random access preamble sequence sets comprise a sequence having a repeated preamble structure.
4. The method of claim 1 , wherein the path loss is a path loss of a downlink signal.
5. The method of claim 1 , further comprising:
determining the degree of the path loss in accordance with an intra-cell location of the specific user equipment.
6. An apparatus for transmitting a signal, the apparatus comprising:
a sequence selecting module configured to
acquire information about plural random access preamble sequence sets,
select one random access preamble sequence set from among the plural random access preamble sequence sets by considering a size of information to be transmitted by the apparatus and a degree of a path loss,
wherein sequences within the predetermined random access preamble sequence sets are generated by applying a cyclic shift to a CAZAC (Constant Amplitude Zero Auto Correlation) sequence, and
wherein a first number of the sequences and a second number of the sequences are allocated to each of a first and a second random access preamble sequence set within the predetermined random access preamble sequence sets within the number of available CAZAC sequences, and
randomly select a specific sequence within the selected one random access preamble sequence set; and
an access module configured to access a random access channel using the specific sequence selected by the sequence selecting module.
7. The apparatus of claim 6 , wherein the first number and the second number are differently determined.
8. The apparatus of claim 6 , wherein the sequences within the predetermined random access preamble sequence sets comprise a sequence having a repeated preamble structure.
9. The apparatus of claim 6 , wherein the path loss is a path loss of a downlink signal.
10. The apparatus of claim 6 , wherein the degree of the path loss is determined in accordance with an intra-cell location of the specific user equipment.