Reference signal transmitting method and device, and reference signal receiving method and device

1. A method for sending a reference signal, comprising:

determining, according to a preset mode, a location of a time-frequency resource for sending a reference signal in a Transmission Time Interval (TTI); and

sending the reference signal according to the location of the time-frequency resource;

wherein the determining, according to a preset mode, a location of a time-frequency resource for sending a reference signal in a TTI comprises:

determining that the reference signal corresponds to one or more symbols meeting a first preset condition in the TTI, and that the reference signal corresponds to a subcarrier on the one or more symbols that is determined according to at least one of the following: a port of an antenna sending a Cell-specific Reference Signal (CRS) or an identification of a cell,

wherein the first preset condition comprises:

an index n of the one or more symbols being no less than an integer m that is no less than zero, m being a number of symbols occupied by a Physical Downlink Control Channel (PDCCH) or a preset number of symbols, the index of the one or more symbols being an index of a symbol in a time slot, nϵ{0, 1, 2, 3, 4, 5, 6} for a normal Cyclic Prefix (CP), and nϵ{0, 1, 2, 3, 4, 5, 6} for an extended CP.

2. The method according to claim 1 ,

wherein the reference signal corresponds to a subcarrier that is preset,

wherein the reference signal corresponds to one or more symbols meeting a second preset condition in the TTI on the subcarrier,

wherein the second preset condition comprises at least one of:

the one or more symbols being determined according to at least one of the following: the port of an antenna sending the CRS or the identification of a cell; or

an index n of the one or more symbols being no less than an integer m that is no less than zero, m being the number of symbols occupied by the PDCCH or the preset number of symbols, the index of the one or more symbols being the index of the symbol in the time slot, nϵ{0, 1, 2, 3, 4, 5, 6} for a normal CP, nϵ{0, 1, 2, 3, 4, 5} for the extended CP.

3. The method according to claim 2 ,

wherein the reference signal corresponds to the subcarrier with an index kϵ{0, 1, 5, 6, 10, 11} in a Physical Resource Block (PRB),

wherein the one or more symbols on the subcarrier are determined according to at least one of the port of the antenna sending the CRS or the identification of the cell by at least one of the following manners:

for n ID cell mod 3=0, and n ID cell being an identification of the cell in a physical layer,

for p=0, or p=0 and p=1, and p being the port of the antenna sending the CRS, determining that the reference signal corresponds to the index nϵ{0, 1, 2, 3, 4, 5, 6} on the subcarrier with the index kϵ{1, 5, 10, 11} corresponding to the reference signal; determining that the reference signal corresponds to the index nϵ{1, 2, 3, 5, 6} on the subcarrier with the index kϵ{0, 6} corresponding to the reference signal;

for p=0, p=1, p=2, and p=3, and p being the port of the antenna sending the CRS, determining that the reference signal corresponds to the index nϵ{0, 1, 2, 3, 4, 5, 6} on the subcarrier with the index kϵ{1, 5, 10, 11} corresponding to the reference signal; determining that the reference signal corresponds to the index nϵ{2, 3, 5, 6} on the subcarrier with the index kϵ{0, 6} corresponding to the reference signal;

or for n ID cell mod 3=1,

for p=0, and p being the port of the antenna sending the CRS, determining that the reference signal corresponds to the index nϵ{0, 1, 2, 3, 4, 5, 6} on the subcarrier with the index kϵ{0, 5, 6, 10, 11} corresponding to the reference signal; determining that the reference signal corresponds to the index nϵ{1, 2, 3, 5, 6} on the subcarrier with the index kϵ{1} corresponding to the reference signal;

for p=0 and p=1, and p being the port of the antenna sending the CRS, determining that the reference signal corresponds to the index nϵ{0, 1, 2, 3, 4, 5, 6} on the subcarrier with the index kϵ{0, 5, 6, 11} corresponding to the reference signal; determining that the reference signal corresponds to the index nϵ{1, 2, 3, 5, 6} on the subcarrier with the index kϵ{1, 10} corresponding to the reference signal;

for p=0, p=1, p=2, and p=3, and p being the port of the antenna sending the CRS, determining that the reference signal corresponds to the index nϵ{0, 1, 2, 3, 4, 5, 6} on the subcarrier with the index kϵ{0, 5, 6, 11} corresponding to the reference signal; determining that the reference signal corresponds to the index nϵ{2, 3, 5, 6} on the subcarrier with the index kϵ{1, 10} corresponding to the reference signal;

or for n ID cell mod 3=2,

for p=0, and p being the port of the antenna sending the CRS, determining that the reference signal corresponds to the index nϵ{0, 1, 2, 3, 4, 5, 6} on the subcarrier with the index kϵ{0, 1, 5, 6, 10, 11} corresponding to the reference signal;

for p=0 and p=1, and p being the port of the antenna sending the CRS, determining that the reference signal corresponds to the index nϵ{0, 1, 2, 3, 4, 5, 6} on the subcarrier with the index kϵ{0, 1, 6, 10} corresponding to the reference signal; determining that the reference signal corresponds to the index nϵ{1, 2, 3, 5, 6} on the subcarrier with the index kϵ{5, 11} corresponding to the reference signal;

for p=0, p=1, p=2, and p=3, and p being the port of the antenna sending the CRS, determining that the reference signal corresponds to the index nϵ{0, 1, 2, 3, 4, 5, 6} on the subcarrier with the index kϵ{0, 1, 6, 10} corresponding to the reference signal; determining that the reference signal corresponds to the index nϵ{2, 3, 5, 6} on the subcarrier with the index kϵ{5, 11} corresponding to the reference signal,

wherein subcarriers in a PRB are given indices 0 to 11 in ascending frequencies.

4. The method according to claim 2 ,

wherein the reference signal corresponds to the subcarrier with an index kϵ{1, 4, 7, 10},

wherein the one or more symbols on the subcarrier are determined according to at least one of the port of the antenna sending the CRS or the identification of the cell by at least one of the following manners:

for n ID cell mod 3=0 or n ID cell mod 3=2, and n ID cell being an identification of the cell in a physical layer,

determining that the subcarrier with the index kϵ{1, 4, 7, 10} corresponds to the index nϵ{0, 1, 2, 3, 4, 5};

or for n ID cell mod 3=1,

for p=0, and p being the port of the antenna sending the CRS, determining that the reference signal corresponds to the index nϵ{1, 2, 4, 5} on the subcarrier with the index kϵ{1, 7} corresponding to the reference signal; determining that the reference signal corresponds to the index nϵ{0, 1, 2, 3, 4, 5} on the subcarrier with the index kϵ{4, 10} corresponding to the reference signal;

for p=0 and p=1, and p being the port of the antenna sending the CRS, determining that the reference signal corresponds to the index nϵ{1, 2, 4, 5} on the subcarrier with the index kϵ{1, 4, 7, 10} corresponding to the reference signal;

for p=0, p=1, p=2, and p=3, and p being the port of the antenna sending the CRS, determining that the reference signal corresponds to the index nϵ{2, 4, 5} on the subcarrier with the index kϵ{1, 4, 7, 10} corresponding to the reference signal.

5. The method according to claim 2 ,

wherein the reference signal corresponds to the subcarrier with an index kϵ{2, 5, 8, 11},

wherein the one or more symbols on the subcarrier are determined according to at least one of the port of the antenna sending the CRS or the identification of the cell by at least one of the following manners:

for n ID cell mod 3=0 or n ID cell mod 3=1, and n ID cell being an identification of the cell in a physical layer,

determining that the reference signal corresponds to the index nϵ{0, 1, 2, 3, 4, 5} on the subcarrier with the index kϵ{2, 5, 8, 11} corresponding to the reference signal,

or for n ID cell mod 3=2,

for p=0, and p being the port of the antenna sending the CRS, determining that the reference signal corresponds to the index nϵ{1, 2, 4, 5} on the subcarrier with the index kϵ{2, 8} corresponding to the reference signal; determining that the reference signal corresponds to the index nϵ{0, 1, 2, 3, 4, 5} on the subcarrier with the index kϵ{4, 10} corresponding to the reference signal;

for p=0 and p=1, and p being the port of the antenna sending the CRS, determining that the reference signal corresponds to the index nϵ{1, 2, 4, 5} on the subcarrier with the index kϵ{2, 5, 8, 11} corresponding to the reference signal;

for p=0, p=1, p=2, and p=3, and p being the port of the antenna sending the CRS, determining that the reference signal corresponds to the index nϵ{2, 4, 5} on the subcarrier with the index kϵ{2, 5, 8, 11} corresponding to the reference signal.

6. The method according to claim 2 , wherein the reference signal corresponds to one or more symbols with minimal indices meeting the second preset condition in the TTI.

7. The method according to claim 1 , wherein the subcarrier corresponding to the reference signal is determined according to at least one of the port of the antenna sending the CRS or the identification of the cell by at least one of the following manners:

for n ID cell mod 3=0, and n ID cell being an identification of the cell in a physical layer,

for p=0, and p being the port of the antenna sending the CRS, determining that the reference signal corresponds to the subcarrier with an index k E {1, 2, 3, 4, 5, 7, 8, 9, 10, 11};

for p=0 and p=1, or p=0, p=1, p=2, and p=3, and p being the port of the antenna sending the CRS, determining that the reference signal corresponds to the subcarrier with the index kϵ{1, 2, 4, 5, 7, 8, 10, 11} in a Physical Resource Block (PRB);

or for n ID cell mod 3=1,

for p=0, and p being the port of the antenna sending the CRS, determining that the reference signal corresponds to the subcarrier with the index kϵ{0, 2, 3, 4, 5, 6, 8, 9, 10, 11};

for p=0 and p=1, or p=0, p=1, p=2, and p=3, and p being the port of the antenna sending the CRS, determining that the reference signal corresponds to the subcarrier with the index kϵ{0, 2, 3, 5, 6, 8, 9, 11};

or for n ID cell mod 3=2,

for p=0, and p being the port of the antenna sending the CRS, determining that the reference signal corresponds to the subcarrier with the index kϵ{0, 1, 3, 4, 5, 6, 7, 9, 10, 11};

for p=0 and p=1, or p=0, p=1, p=2, and p=3, and p being the port of the antenna sending the CRS, determining that the reference signal corresponds to the subcarrier with the index kϵ{0, 1, 3, 4, 6, 7, 9, 10},

wherein subcarriers in a PRB are given indices 0 to 11 in ascending frequencies.

8. The method according to claim 1 , wherein the determining that the reference signal corresponds to one or more symbols meeting a first preset condition in the TTI comprises:

determining that the reference signal corresponds to one or more symbols with minimal indices meeting the first preset condition in the TTI.

9. The method according to claim 1 , wherein in the TTI,

the time-frequency resource corresponds to a symbol with an index nϵ{2, 3, 5, 6} for a normal Cyclic Prefix (CP),

the time-frequency resource corresponds to the symbol with the index nϵ{2, 4, 5} for an extended CP.

10. The method according to claim 9 , wherein the reference signal corresponds to one or more symbols with minimal indices in the TTI.

11. The method according to claim 1 ,

wherein for the TTI of a duration of a time slot, for a normal Cyclic Prefix (CP), the time-frequency resource corresponds to a symbol with an index nϵ{2, 3}, and a subcarrier with an index kϵ{0, 1, 5, 6, 10, 11} in a Physical Resource Block (PRB),

wherein symbols in the TTI are given indices 0, 1, 2, 3, 4, 5, and 6, wherein subcarriers in a PRB are given indices 0 to 11 in ascending frequencies.

12. The method according to claim 1 , wherein a TTI is adjacent to one or more symbols in a neighbor TTI.

13. The method according to claim 12 , wherein the one or more symbols in the neighbor TTI comprise the reference signal.

14. The method according to claim 1 , wherein frequency resource allocation in the TTI is done at a granularity of 12×y subcarriers, wherein y is an integer greater than 1.

15. The method according to claim 1 ,

wherein the reference signal occupies 1, 2, 3, or 4 of 12 Resource Elements (RE) comprised in a Physical Resource Block (PRB) on a symbol comprising the reference signal.

16. The method according to claim 15 , wherein the reference signal occupies REs that are consecutive in a frequency domain.

17. A method for receiving a reference signal, comprising:

receiving, by User Equipment (UE), a reference signal sent by a Base Station (BS), wherein a location of a time-frequency resource for sending the reference signal in a Transmission Time Interval (TTI) is determined according to a preset mode;

wherein the location of a time-frequency resource for sending the reference signal in a TTI is determined according to a preset mode by:

determining that the reference signal corresponds to one or more symbols meeting a first preset condition in the TTI, and that the reference signal corresponds to a subcarrier on the one or more symbols that is determined according to at least one of the following: a port of an antenna sending a Cell-specific Reference Signal (CRS) or an identification of a cell,

wherein the first preset condition comprises:

an index n of the one or more symbols being no less than an integer m that is no less than zero, m being a number of symbols occupied by a Physical Downlink Control Channel (PDCCH) or a preset number of symbols, the index of the one or more symbols being an index of a symbol in a time slot, nϵ{0, 1, 2, 3, 4, 5, 6} for a normal Cyclic Prefix (CP), and nϵ{0, 1, 2, 3, 4, 5, 6} for an extended CP.

18. A device for sending a reference signal, applying to a Base Station (BS), the device comprising:

a processor; and

memory storing instructions executable by the processor for:

determining, according to a preset mode, a location of a time-frequency resource for sending a reference signal in a Transmission Time Interval (TTI); and

sending the reference signal according to the location of the time-frequency resource;

wherein the determining, according to a preset mode, a location of a time-frequency resource for sending a reference signal in a TTI comprises:

determining that the reference signal corresponds to one or more symbols meeting a first preset condition in the TTI, and that the reference signal corresponds to a subcarrier on the one or more symbols that is determined according to at least one of the following: a port of an antenna sending a Cell-specific Reference Signal (CRS) or an identification of a cell,

wherein the first preset condition comprises:

an index n of the one or more symbols being no less than an integer m that is no less than zero, m being a number of symbols occupied by a Physical Downlink Control Channel (PDCCH) or a preset number of symbols, the index of the one or more symbols being an index of a symbol in a time slot, nϵ{0, 1, 2, 3, 4, 5, 6} for a normal Cyclic Prefix (CP), and nϵ{0, 1, 2, 3, 4, 5, 6} for an extended CP.

19. A device for receiving a reference signal, applying to User Equipment (UE), the device comprising:

a processor; and

memory storing instructions executable by the processor for receiving a reference signal sent by a Base Station (BS), wherein a location of a time-frequency resource for sending the reference signal in a Transmission Time Interval (TTI) is determined according to a preset mode;

wherein the location of a time-frequency resource for sending the reference signal in a TTI is determined according to a preset mode by:

determining that the reference signal corresponds to one or more symbols meeting a first preset condition in the TTI, and that the reference signal corresponds to a subcarrier on the one or more symbols that is determined according to at least one of the following: a port of an antenna sending a Cell-specific Reference Signal (CRS) or an identification of a cell,

wherein the first preset condition comprises:

an index n of the one or more symbols being no less than an integer m that is no less than zero, m being a number of symbols occupied by a Physical Downlink Control Channel (PDCCH) or a preset number of symbols, the index of the one or more symbols being an index of a symbol in a time slot, nϵ{0, 1, 2, 3, 4, 5, 6} for a normal Cyclic Prefix (CP), and nϵ{0, 1, 2, 3, 4, 5, 6} for an extended CP.