A method of configuring an uplink connection, which is configured by a user equipment with a baseband unit, BBU, in a cloud radio access network, C-RAN, environment in which a remote radio head, RRH, and the BBU are separated from each other, the method comprising: receiving a downlink signal from a plurality of RRHs; transmitting a random access preamble to a target RRH of which strength of the received downlink signal is equal to or greater than a threshold value among a plurality of the RRHs; when a reception power of the random access preamble overheard by a neighboring RRH adjacent to the target RRH is greater than a reception power of the random access preamble received by the target RRH, the method further comprising: receiving a random access response message for indicating to configure an uplink connection with the neighboring RRH, through the target RRH; receiving information on a timing advance value between the neighboring RRH and the user equipment through the target RRH, wherein the timing advance value is determined based on a first value of a time gap between the target RRH and the neighboring RRH, a second value of a time gap between a subframe boundary of the target RRH and a start time of reception of the random access preamble by the target RRH, and a third value of a time gap between a subframe boundary of the neighboring RRH and a start time of reception of the random access preamble by the neighboring RRH, characterised in that the timing advance value satisfies below equation: X 4 = X 1 + X 2 − X 3 / 2 where, X1 denotes the first value, X2 denotes the second value, X3 denotes the third value and X4 denotes the timing advance value; and configuring an uplink connection with the neighboring RRH by using the information on the timing advance value, wherein each of the neighboring RRH and the target RRH is connected to its own BBU. receiving a downlink signal from a plurality of RRHs; transmitting a random access preamble to a target RRH of which strength of the received downlink signal is equal to or greater than a threshold value among a plurality of the RRHs; when a reception power of the random access preamble overheard by a neighboring RRH adjacent to the target RRH is greater than a reception power of the random access preamble received by the target RRH, the method further comprising: receiving a random access response message for indicating to configure an uplink connection with the neighboring RRH, through the target RRH; receiving information on a timing advance value between the neighboring RRH and the user equipment through the target RRH, wherein the timing advance value is determined based on a first value of a time gap between the target RRH and the neighboring RRH, a second value of a time gap between a subframe boundary of the target RRH and a start time of reception of the random access preamble by the target RRH, and a third value of a time gap between a subframe boundary of the neighboring RRH and a start time of reception of the random access preamble by the neighboring RRH, characterised in that the timing advance value satisfies below equation: X 4 = X 1 + X 2 − X 3 / 2 where, X1 denotes the first value, X2 denotes the second value, X3 denotes the third value and X4 denotes the timing advance value; and configuring an uplink connection with the neighboring RRH by using the information on the timing advance value, receiving a random access response message for indicating to configure an uplink connection with the neighboring RRH, through the target RRH; receiving information on a timing advance value between the neighboring RRH and the user equipment through the target RRH, wherein the timing advance value is determined based on a first value of a time gap between the target RRH and the neighboring RRH, a second value of a time gap between a subframe boundary of the target RRH and a start time of reception of the random access preamble by the target RRH, and a third value of a time gap between a subframe boundary of the neighboring RRH and a start time of reception of the random access preamble by the neighboring RRH, characterised in that the timing advance value satisfies below equation: X 4 = X 1 + X 2 − X 3 / 2 where, X1 denotes the first value, X2 denotes the second value, X3 denotes the third value and X4 denotes the timing advance value; and configuring an uplink connection with the neighboring RRH by using the information on the timing advance value, wherein each of the neighboring RRH and the target RRH is connected to its own BBU.