Communication method, communications apparatus, and system
Example communication methods and apparatus are described. One example communication method includes receiving broadcast information by a terminal device. The broadcast information includes a first parameter and a second parameter that are for a first cell. The first parameter is used for cell selection or cell reselection performed by a terminal device that supports supplementary uplink (SUL) carrier transmission, and the second parameter is used for cell selection or cell reselection performed by a terminal device that does not support SUL carrier transmission. The terminal device performs cell selection or cell reselection based on the first parameter when the terminal device supports SUL carrier transmission. The terminal device performs cell selection or cell reselection based on the second parameter when the terminal device does not support SUL carrier transmission.
1. A communication method, wherein the method comprises:
receiving, by a terminal device, a broadcast message, wherein the broadcast message comprises a first parameter and a second parameter that are for a first cell, wherein the first parameter is used to determine a minimum receive level value required by the first cell when the terminal device supports supplementary uplink (SUL) carrier transmission, and wherein the second parameter is used to determine a minimum receive level value required by the first cell when the terminal device does not support SUL carrier transmission; and
performing, by the terminal device, cell selection or cell reselection based on the first parameter when the terminal device supports SUL carrier transmission; or
performing, by the terminal device, cell selection or cell reselection based on the second parameter when the terminal device does not support SUL carrier transmission.
2. The method according to claim 1 , wherein the performing, by the terminal device, cell selection or cell reselection based on the first parameter when the terminal device supports SUL carrier transmission comprises:
determining, based on the first parameter, whether to camp on the first cell, or whether to reselect to the first cell.
3. The method according to claim 1 , wherein the performing, by the terminal device, cell selection or cell reselection based on the second parameter when the terminal device does not support SUL carrier transmission comprises:
determining, based on the second parameter, whether to camp on the first cell, or whether to reselect to the first cell.
4. The method according to claim 2 , wherein the determining, based on the first parameter, whether to camp on the first cell, or whether to reselect to the first cell comprises:
determining, based on Srxlev_1, whether to camp on the first cell, or whether to reselect to the first cell, wherein the Srxlev_1=Q rxlevmeas −(Q rxlevmin −Q rxlevminoffset −Offset_1)−Pcompensation, wherein the Q rxlevmeas is a received signal strength value measured by the terminal device and the received signal strength value is measured reference signal receiving power (RSRP), wherein the Q rxlevmin is indicated by the first parameter, wherein the Q rxlevminOffset is a parameter that has an offset to Q rxlevmin , wherein the Offset_1 is an offset value and the offset value is set by a network device based on a capability of the terminal device or a configuration of the network device, wherein the Pcompensation is a larger value in (P EMAX −P UMAX ) or 0, wherein P EMAX is maximum allowed transmit power, and wherein P UMAX refers to maximum output power.
5. The method according to claim 1 , wherein the first cell is a serving cell or a neighboring cell of the terminal device.
6. The method according to claim 1 , wherein a value of the first parameter is less than a value of the second parameter.
7. The method according to claim 1 , further comprising:
determining, based on the broadcast message by the terminal device, that a frequency band of the first cell comprises an SUL frequency band.
8. A communication method, wherein the method comprises:
sending, by a network device, a broadcast message to a terminal device, wherein the broadcast message comprises a first parameter and a second parameter that are for a first cell, wherein the first parameter is used to determine a minimum receive level value required by the first cell when the terminal device supports supplementary uplink (SUL) carrier transmission, and wherein the second parameter is used to determine a minimum receive level value required by the first cell when the terminal device does not support SUL carrier transmission.
9. The method according to claim 8 , wherein the first cell is a serving cell or a neighboring cell of the terminal device.
10. The method according to claim 8 , wherein a value of the first parameter is less than a value of the second parameter.
11. A apparatus, comprising:
a memory, configured to store a computer program; and
at least one processor, wherein the computer program stored in the memory, when executed by the at least one processor, enables the apparatus to perform:
receiving a broadcast message, wherein the broadcast message comprises a first parameter and a second parameter that are for a first cell, wherein the first parameter is used to determine a minimum receive level value required by the first cell when the apparatus supports supplementary uplink (SUL) carrier transmission, and wherein the second parameter is used to determine a minimum receive level value required by the first cell when the apparatus does not support SUL carrier transmission; and
performing cell selection or cell reselection based on the first parameter when the apparatus supports SUL carrier transmission; or
performing cell selection or cell reselection based on the second parameter when the apparatus does not support SUL carrier transmission.
12. The apparatus according to claim 11 , wherein the performing cell selection or cell reselection based on the first parameter when the apparatus supports SUL carrier transmission comprises:
determining, based on the first parameter, whether to camp on the first cell, or whether to reselect to the first cell.
13. The apparatus according to claim 11 , wherein the performing cell selection or cell reselection based on the second parameter when the apparatus does not support SUL carrier transmission comprises:
determining, based on the second parameter, whether to camp on the first cell, or whether to reselect to the first cell.
14. The apparatus according to claim 13 , wherein the determining, based on the second parameter, whether to camp on the first cell, or whether to reselect to the first cell comprises:
determining, based on Srxlev, whether to camp on the first cell, or whether to reselect to the first cell, wherein the Srxlev_1=Q rxlevmeas −(Q rxlevmin −Q rxlevminoffset −Offset_1)−Pcompensation, wherein the Q rxlevmeas is a received signal strength value measured by the apparatus and the received signal strength value is measured reference signal receiving power (RSRP), wherein the Q rxlevmin is indicated by the second parameter, wherein the Q rxlevminOffset is a parameter that has an offset to Q rxlevmin, wherein the Offset_1 is an offset value and the offset value is set by a network device based on a capability of the apparatus or a configuration of the network device, wherein the Pcompensation is a larger value in (P EMAX −P UMAX ) or 0, wherein P EMAX is maximum allowed transmit power, and wherein P UMAX refers to maximum output power.
15. The apparatus according to claim 11 , wherein the first cell is a serving cell or a neighboring cell of the apparatus.
16. The apparatus according to claim 11 , wherein a value of the first parameter is less than a value of the second parameter.
17. The apparatus according to claim 11 , wherein the computer program enables the apparatus to further perform:
determining, based on the broadcast message, that a frequency band of the first cell comprises an SUL frequency band.
18. A apparatus, comprising:
a memory, configured to store a computer program; and
at least one processor, wherein the computer program stored in the memory, when executed by the at least one processor, enables the apparatus to perform:
sending a broadcast message to a terminal device, wherein the broadcast message comprises a first parameter and a second parameter that are for a first cell, wherein the first parameter is used to determine a minimum receive level value required by the first cell when the terminal device supports supplementary uplink (SUL) carrier transmission, and wherein the second parameter is used to determine a minimum receive level value required by the first cell when the terminal device does not support SUL carrier transmission.
19. The apparatus according to claim 18 , wherein the first cell is a serving cell or a neighboring cell of the terminal device.
20. The apparatus according to claim 18 , wherein a value of the first parameter is less than a value of the second parameter.