Communication method and communications apparatus
Example communication methods and apparatus that are applied to discrete narrowband communication information are described. One example communication method includes sending first indication information to a terminal by a network device. The first indication information includes a frequency channel number of a start sub-band in all discrete sub-bands of a serving cell in which the terminal is currently located, a bitmap representing whether each sub-band in a frequency band belongs to the serving cell, and a frequency spacing between sub-bands in the frequency band. The frequency band is a frequency band to which all the discrete sub-bands of the serving cell belong. The network device sends second indication information to the terminal, wherein the second indication information is used to indicate a sub-band available to the terminal in all the discrete sub-bands of the serving cell.
1. A communication method, applied to a discrete narrowband communications system, comprising:
sending, by a network device, first indication information to a terminal, wherein the first indication information comprises:
a frequency channel number of a start sub-band in all discrete sub-bands of a serving cell in which the terminal is currently located;
a bitmap representing whether each sub-band in a frequency band belongs to the serving cell; and
a frequency spacing between sub-bands in the frequency band, wherein the frequency band is a frequency band to which all the discrete sub-bands of the serving cell belong; and
sending, by the network device, second indication information to the terminal, wherein the second indication information is used to indicate a specified quantity of consecutive logical sub-bands to the terminal in all the discrete sub-bands of the serving cell, wherein the specified quantity of consecutive logical sub-bands are allocated by the network device based on at least one of a load status of the serving cell of the terminal or a current service requirement of the terminal, wherein the specified quantity of consecutive logical sub-bands are a specified quantity of sub-bands with consecutive numbers in all the discrete sub-bands of the serving cell, wherein cyclic shift is performed between a logical sub-band number and an actual physical sub-band number of the specified quantity of consecutive logical sub-bands based on a subframe number or a slot number, and wherein the actual physical sub-band number is a sequence number of each of all the discrete sub-bands of the serving cell.
2. The method according to claim 1 , wherein the first indication information further comprises a quantity of all the discrete sub-bands of the serving cell.
3. The method according to claim 1 , wherein the method further comprises:
sending, by the network device, third indication information to the terminal, wherein the third indication information is used to indicate at least one piece of anchor sub-band information, and wherein the anchor sub-band information comprises at least one of the following information:
a frequency channel number of an anchor sub-band;
a sequence number of the anchor sub-band in all the discrete sub-bands of the serving cell; or
a spacing of the frequency channel number of the anchor sub-band relative to the frequency channel number of the start sub-band.
4. The method according to claim 1 , wherein before the sending, by the network device, second indication information to the terminal, the method further comprises:
receiving, by the network device, sub-band aggregation specification capability information sent by the terminal, wherein the sub-band aggregation specification capability information is used to indicate a quantity of sub-bands of which aggregation is supported by the terminal.
5. The method according to claim 1 , wherein the method further comprises:
sending fourth indication information to the terminal, wherein the fourth indication information is used to indicate a sub-band in which the terminal receives a system message; and
wherein the fourth indication information carries one of the following information, to indicate the sub-band in which the terminal receives the system message:
the frequency channel number of the start sub-band and a bitmap representing that the terminal is capable of receiving system information; or
a frequency channel number of each sub-band in which the terminal is capable of receiving the system information, wherein the frequency channel number of each sub-band is represented by using a frequency spacing of the sub-band relative to an anchor sub-band.
6. A communication method, applied to a discrete narrowband communications system, comprising:
receiving, by a terminal, first indication information sent by a network device, wherein the first indication information comprises:
a frequency channel number of a start sub-band in all discrete sub-bands of a serving cell in which the terminal is currently located;
a bitmap representing whether each sub-band in a frequency band belongs to the serving cell; and
a frequency spacing between sub-bands in the frequency band, wherein the frequency band is a frequency band to which all the discrete sub-bands of the serving cell belong; and
receiving, by the terminal, second indication information sent by the network device, wherein the second indication information is used to indicate a specified quantity of consecutive logical sub-bands to the terminal in all the discrete sub-bands of the serving cell, wherein the specified quantity of consecutive logical sub-bands are allocated by the network device based on at least one of a load status of the serving cell of the terminal or a current service requirement of the terminal, wherein the specified quantity of consecutive logical sub-bands are a specified quantity of sub-bands with consecutive numbers in all the discrete sub-bands of the serving cell, wherein cyclic shift is performed between a logical sub-band number and an actual physical sub-band number of the specified quantity of consecutive logical sub-bands based on a subframe number or a slot number, and wherein the actual physical sub-band number is a sequence number of each of all the discrete sub-bands of the serving cell.
7. The method according to claim 6 , wherein the first indication information further comprises a quantity of all the discrete sub-bands of the serving cell.
8. The method according to claim 6 , wherein the method further comprises:
receiving, by the terminal, third indication information sent by the network device, wherein the third indication information is used to indicate at least one piece of anchor sub-band information, and wherein the anchor sub-band information comprises at least one of the following information:
a frequency of an anchor sub-band;
a sequence number of the anchor sub-band in all the discrete sub-bands of the serving cell; or
a spacing of the frequency channel number of the anchor sub-band relative to the frequency channel number of the start sub-band.
9. The method according to claim 6 , wherein before the receiving, by the terminal, second indication information sent by the network device, the method further comprises:
sending, by the terminal, sub-band aggregation specification capability information to the network device, wherein the sub-band aggregation specification capability information is used to indicate a quantity of sub-bands of which aggregation is supported by the terminal.
10. The method according to claim 6 , wherein the method further comprises:
receiving, by the terminal, fourth indication information sent by the network device, wherein the fourth indication information is used to indicate a sub-band in which the terminal receives a system message; and
wherein the fourth indication information carries one of the following information, to indicate the sub-band in which the terminal receives the system message:
the frequency channel number of the start sub-band and a bitmap representing that the terminal is capable of receiving system information; or
a frequency channel number of each sub-band in which the terminal is capable of receiving the system information, wherein the frequency channel number of each sub-band is represented by using a frequency spacing of the sub-band relative to an anchor sub-band.
11. A communications apparatus, applied to a network device in a discrete narrowband communications system, and comprising at least one processor and a transceiver, wherein:
the transceiver sends first indication information and second indication information to a terminal under control of the at least one processor,
wherein the first indication information comprises:
a frequency channel number of a start sub-band in all discrete sub-bands of a serving cell in which the terminal is currently located;
a bitmap representing whether each sub-band in a frequency band belongs to the serving cell; and
a frequency spacing between sub-bands in the frequency band, wherein the frequency band is a frequency band to which all the discrete sub-bands of the serving cell belong; and
wherein the second indication information is used to indicate a specified quantity of consecutive logical sub-bands to the terminal in all the discrete sub-bands of the serving cell, wherein the specified quantity of consecutive logical sub-bands are allocated by the network device based on at least one of a load status of the serving cell of the terminal or a current service requirement of the terminal, wherein the specified quantity of consecutive logical sub-bands are a specified quantity of sub-bands with consecutive numbers in all the discrete sub-bands of the serving cell, wherein cyclic shift is performed between a logical sub-band number and an actual physical sub-band number of the specified quantity of consecutive logical sub-bands based on a subframe number or a slot number, and wherein the actual physical sub-band number is a sequence number of each of all the discrete sub-bands of the serving cell.
12. The apparatus according to claim 11 , wherein the first indication information further comprises a quantity of all the discrete sub-bands of the serving cell.
13. The apparatus according to claim 11 , wherein the transceiver is further configured to:
send third indication information to the terminal, wherein the third indication information is used to indicate at least one piece of anchor sub-band information, and wherein the anchor sub-band information comprises at least one of the following information:
a frequency of an anchor sub-band;
a sequence number of the anchor sub-band in all the discrete sub-bands of the serving cell; or
a spacing of the frequency channel number of the anchor sub-band relative to the frequency channel number of the start sub-band.
14. The apparatus according to claim 11 , wherein the transceiver is further configured to:
before sending the second indication information to the terminal, receive sub-band aggregation specification capability information sent by the terminal, wherein the sub-band aggregation specification capability information is used to indicate a quantity of sub-bands of which aggregation is supported by the terminal.
15. The apparatus according to claim 11 , wherein the transceiver is further configured to:
send fourth indication information to the terminal, wherein the fourth indication information is used to indicate a sub-band in which the terminal receives a system message; and
wherein the fourth indication information carries one of the following information, to indicate the sub-band in which the terminal receives the system message:
the frequency channel number of the start sub-band and a bitmap representing that the terminal is capable of receiving system information; or
a frequency channel number of each sub-band in which the terminal is capable of receiving the system information, wherein the frequency channel number of each sub-band is represented by using a frequency spacing of the sub-band relative to an anchor sub-band.
16. A communications apparatus, applied to a terminal in a discrete narrowband communications system, and comprising at least one processor and a receiver, wherein:
the receiver receives, under control of the at least one processor, first indication information and second indication information that are sent by a network device,
wherein the first indication information comprises:
a frequency channel number of a start sub-band in all discrete sub-bands of a serving cell in which the terminal is currently located;
a bitmap representing whether each sub-band in a frequency band belongs to the serving cell; and
a frequency spacing between sub-bands in the frequency band, wherein the frequency band is a frequency band to which all the discrete sub-bands of the serving cell belong; and
wherein the second indication information is used to indicate a specified quantity of consecutive logical sub-bands to the terminal in all the discrete sub-bands of the serving cell, wherein the specified quantity of consecutive logical sub-bands are allocated by the network device based on at least one of a load status of the serving cell of the terminal or a current service requirement of the terminal, wherein the specified quantity of consecutive logical sub-bands are a specified quantity of sub-bands with consecutive numbers in all the discrete sub-bands of the serving cell, wherein cyclic shift is performed between a logical sub-band number and an actual physical sub-band number of the specified quantity of consecutive logical sub-bands based on a subframe number or a slot number, and wherein the actual physical sub-band number is a sequence number of each of all the discrete sub-bands of the serving cell.
17. The apparatus according to claim 16 , wherein the first indication information further comprises a quantity of all the discrete sub-bands of the serving cell.
18. The apparatus according to claim 16 , wherein the receiver is further configured to:
receive third indication information sent by the network device, wherein the third indication information is used to indicate at least one piece of anchor sub-band information, and wherein the anchor sub-band information comprises at least one of the following information:
a frequency of an anchor sub-band;
a sequence number of the anchor sub-band in all the discrete sub-bands of the serving cell; or
a spacing of the frequency channel number of the anchor sub-band relative to the frequency channel number of the start sub-band.
19. The apparatus according to claim 16 , wherein the apparatus further comprises a transmitter, and wherein the transmitter is configured to:
before the receiver receives the second indication information sent by the network device, send sub-band aggregation specification capability information to the network device, wherein the sub-band aggregation specification capability information is used to indicate a quantity of sub-bands of which aggregation is supported by the terminal.
20. The apparatus according to claim 16 , wherein the receiver is further configured to:
receive fourth indication information sent by the network device, wherein the fourth indication information is used to indicate a sub-band in which the terminal receives a system message; and
wherein the fourth indication information carries one of the following information, to indicate the sub-band in which the terminal receives the system message:
the frequency channel number of the start sub-band and a bitmap representing that the terminal is capable of receiving system information; or
a frequency channel number of each sub-band in which the terminal is capable of receiving the system information, wherein the frequency channel number of each sub-band is represented by using a frequency spacing of the sub-band relative to an anchor sub-band.
21. A non-transitory computer-readable storage medium, wherein a computer program is stored on the storage medium, and wherein the computer program, when executed by at least one processor, instruct the at least one processor to perform operations comprising:
sending, by a network device, first indication information to a terminal, wherein the first indication information comprises:
a frequency channel number of a start sub-band in all discrete sub-bands of a serving cell in which the terminal is currently located;
a bitmap representing whether each sub-band in a frequency band belongs to the serving cell; and
a frequency spacing between sub-bands in the frequency band, wherein the frequency band is a frequency band to which all the discrete sub-bands of the serving cell belong; and
sending, by the network device, second indication information to the terminal, wherein the second indication information is used to indicate a specified quantity of consecutive logical sub-bands to the terminal in all the discrete sub-bands of the serving cell, wherein the specified quantity of consecutive logical sub-bands are allocated by the network device based on at least one of a load status of the serving cell of the terminal or a current service requirement of the terminal, wherein the specified quantity of consecutive logical sub-bands are a specified quantity of sub-bands with consecutive numbers in all the discrete sub-bands of the serving cell, wherein cyclic shift is performed between a logical sub-band number and an actual physical sub-band number of the specified quantity of consecutive logical sub-bands based on a subframe number or a slot number, and wherein the actual physical sub-band number is a sequence number of each of all the discrete sub-bands of the serving cell.
22. A non-transitory computer storage medium, wherein a computer program is stored on the storage medium, and wherein the computer program, when executed by at least one processor, instruct the at least one processor to perform operations comprising:
receiving, by a terminal, first indication information sent by a network device, wherein the first indication information comprises:
a frequency channel number of a start sub-band in all discrete sub-bands of a serving cell in which the terminal is currently located;
a bitmap representing whether each sub-band in a frequency band belongs to the serving cell; and
a frequency spacing between sub-bands in the frequency band, wherein the frequency band is a frequency band to which all the discrete sub-bands of the serving cell belong; and
receiving, by the terminal, second indication information sent by the network device, wherein the second indication information is used to indicate a specified quantity of consecutive logical sub-bands to the terminal in all the discrete sub-bands of the serving cell, wherein the specified quantity of consecutive logical sub-bands are allocated by the network device based on at least one of a load status of the serving cell of the terminal or a current service requirement of the terminal, wherein the specified quantity of consecutive logical sub-bands are a specified quantity of sub-bands with consecutive numbers in all the discrete sub-bands of the serving cell, wherein cyclic shift is performed between a logical sub-band number and an actual physical sub-band number of the specified quantity of consecutive logical sub-bands based on a subframe number or a slot number, and wherein the actual physical sub-band number is a sequence number of each of all the discrete sub-bands of the serving cell.