Method and device for deciding location of terminal in a wireless communication system
The present invention relates to a method for deciding a location of a terminal in a wireless communication system, and provides the method for deciding the location comprising the following steps: receiving reference signals from a plurality of base stations; and transmitting reference signal time difference (RSTD) which is received from the plurality of base stations, wherein the reference signal is mapped according to a predetermined pattern inside a subframe.
1. A method for determining a location of a user equipment in a wireless communication system, the method comprising:
receiving reference signals from a plurality of base stations; and
transmitting a reference signal time difference (RSTD) between the received reference signals received from the plurality of base stations,
wherein the reference signals are mapped within a subframe according to a predetermined pattern,
wherein the subframe includes at least one basic unit of which size corresponds to 12 subcarriers×14 OFDM symbols,
wherein the reference signals are mapped into at least one resource element within the basic unit where an resource element is a time-frequency resource defined by one subcarrier and one OFDM symbol, and
wherein the predetermined pattern is configured as illustrated in the following Pattern Table 1, where “P” represents a resource element into which the reference signals are mapped, “SC” is a subcarrier index, and “S” is an OFDM symbol index:
Pattern Table 1
S = 0
S = 1
S = 2
S = 3
S = 4
S = 5
S = 6
S = 7
S = 8
S = 9
S = 10
S = 11
S = 12
S = 13
SC = 11
P
SC = 10
P
SC = 9
P
P
SC = 8
P
SC = 7
P
SC = 6
P
P
SC = 5
P
SC = 4
P
SC = 3
P
P
SC = 2
P
SC = 1
P
SC = 0
P
P.
2. The method according to claim 1 , wherein the reference signals comprise positioning reference signals (PRSs).
3. The method according to claim 1 , wherein the predetermined pattern is cyclic-shifted per cell.
4. The method according to claim 1 , wherein:
a first N number of OFDM symbols within the subframe are used for a control channel; and
more than (N+1) OFDM symbols are used to determine a location of the user equipment.
5. A user equipment in a wireless communication system, the user equipment comprising:
a receiver configured to receive reference signals from a plurality of base stations; and
a controller configured to calculate a reference signal time difference (RSTD) between the received reference signals received from the plurality of base stations,
wherein the reference signals are mapped within a subframe according to a predetermined pattern,
wherein the subframe includes at least one basic unit of which size corresponds to 12 subcarriers×14 OFDM symbols,
wherein the reference signals are mapped into at least one resource element within the basic unit where an resource element is a time-frequency resource defined by one subcarrier and one OFDM symbol, and
wherein the predetermined pattern is configured as illustrated in the following Pattern Table 1, where “P” represents a resource element into which the reference signals are mapped, “SC” is a subcarrier index, and “S” is an OFDM symbol index:
Pattern Table 1
S = 0
S = 1
S = 2
S = 3
S = 4
S = 5
S = 6
S = 7
S = 8
S = 9
S = 10
S = 11
S = 12
S = 13
SC = 11
P
SC = 10
P
SC = 9
P
P
SC = 8
P
SC = 7
P
SC = 6
P
P
SC = 5
P
SC = 4
P
SC = 3
P
P
SC = 2
P
SC = 1
P
SC = 0
P
P.
6. The user equipment according to claim 5 , wherein the reference signals comprise positioning reference signals (PRSs).
7. The user equipment according to claim 5 , wherein the predetermined pattern is cyclic-shifted per cell.