Dynamic coverage mode switching and communication bandwidth adjustment
This disclosure relates to techniques for dynamically changing coverage modes and/or communication bandwidth in a wireless communication system. According to some embodiments, a wireless device may attach to a serving cell associated with a cellular network. A volume of data for upcoming communication with the cellular network may be determined. An indication of a requested communication bandwidth may be provided to the serving cell. The wireless device may communicate data with the serving cell using the requested communication bandwidth. In some instances, a request for narrowband communication bandwidth may result in use of a coverage enhancement mode, while a request for wideband communication bandwidth may result in use of a normal coverage mode.
1. An apparatus, comprising:
a processor configured to cause a base station to:
establish a radio resource control (RRC) connection with a wireless device served by a serving cell provided by the base station;
receive a first RRC message from the wireless device, wherein the first RRC message comprises a first indication of a preferred uplink communication bandwidth mode and a second indication of a preferred downlink communication bandwidth mode;
wherein the preferred uplink communication bandwidth mode is one of a plurality of uplink communication bandwidth modes, wherein the preferred uplink communication bandwidth mode comprises a first maximum uplink communication bandwidth for a physical uplink shared channel (PUSCH) of the serving cell, wherein at least one of the plurality of uplink communication bandwidth modes comprises a maximum uplink communication bandwidth of 1.4 MHz;
wherein the preferred downlink communication bandwidth mode is one of a plurality of downlink communication bandwidth modes, wherein the preferred downlink communication bandwidth mode comprises a first maximum downlink communication bandwidth for a physical downlink shared channel (PDSCH) of the serving cell, wherein at least one of the plurality of downlink communication bandwidth modes comprises a maximum downlink communication bandwidth of 1.4 MHz;
transmit, to the wireless device, a second RRC message configuring and confirming the preferred uplink communication bandwidth mode and the preferred downlink communication bandwidth mode in response to the first RRC message; and
communicate data with the wireless device using the preferred uplink communication bandwidth mode and the preferred downlink communication bandwidth mode.
2. The apparatus of claim 1 , wherein the processor is further configured to cause the base station to:
when the wireless device is in a connected mode of operation after establishing the RRC connection with the wireless device, communicate with the wireless device in a second uplink communication bandwidth mode and a second downlink communication bandwidth mode, wherein the second uplink and downlink communication bandwidth modes are limited, respectively, to the maximum uplink communication bandwidth of 1.4 MHz and the maximum downlink communication bandwidth of 1.4 MHz; and
when the wireless device is in an idle mode of operation after establishing the RRC connection with the wireless device, transmit, to the wireless device, a paging indication using a narrowband physical control channel according to the second downlink communication bandwidth mode.
3. The apparatus of claim 1 , wherein the processor is further configured to cause the base station to:
advertise a first coverage mode supported by the base station.
4. The apparatus of claim 3 , wherein the processor is further configured to cause the base station to:
indicate a first signal strength range associated with the first coverage mode.
5. The apparatus of claim 3 , wherein the processor is further configured to cause the base station to:
indicate a first signal quality range associated with the first coverage mode.
6. The apparatus of claim 1 , wherein the processor is further configured to cause the base station to:
receive, from the wireless device, an indication of a second preferred uplink communication bandwidth mode; and
communicate with the wireless device using the second preferred uplink communication bandwidth mode.
7. The apparatus of claim 1 , wherein at least one of a maximum uplink communication bandwidth or a maximum downlink communication bandwidth is configured separately from a coverage mode.
8. A base station, comprising:
a radio; and
a processor operably connected to the radio and configured to cause the base station to:
establish a radio resource control (RRC) connection with a wireless device served by a serving cell provided by the base station;
receive a first RRC message from the wireless device, wherein the first RRC message comprises a first indication of a preferred uplink communication bandwidth mode and a second indication of a preferred downlink communication bandwidth mode;
wherein the preferred uplink communication bandwidth mode is one of a plurality of uplink communication bandwidth modes, wherein the preferred uplink communication bandwidth mode comprises a first maximum uplink communication bandwidth for a physical uplink shared channel (PUSCH) of the serving cell, wherein at least one of the plurality of uplink communication bandwidth modes comprises a maximum uplink communication bandwidth of 1.4 MHz;
wherein the preferred downlink communication bandwidth mode is one of a plurality of downlink communication bandwidth modes, wherein the preferred downlink communication bandwidth mode comprises a first maximum downlink communication bandwidth for a physical downlink shared channel (PDSCH) of the serving cell, wherein at least one of the plurality of downlink communication bandwidth modes comprises a maximum downlink communication bandwidth of 1.4 MHz;
transmit, to the wireless device, a second RRC message configuring and confirming the preferred uplink communication bandwidth mode and the preferred downlink communication bandwidth mode in response to the first RRC message; and
communicate data with the wireless device using the preferred uplink communication bandwidth mode and the preferred downlink communication bandwidth mode.
9. The base station of claim 8 , wherein the processor is further configured to cause the base station to:
when the wireless device is in a connected mode of operation after establishing the RRC connection with the wireless device, communicate with the wireless device in a second uplink communication bandwidth mode and a second downlink communication bandwidth mode, wherein the second uplink and downlink communication bandwidth modes are limited, respectively, to the maximum uplink communication bandwidth of 1.4 MHz and the maximum downlink communication bandwidth of 1.4 MHz; and
when the wireless device is in an idle mode of operation after establishing the RRC connection with the wireless device, transmit, to the wireless device, a paging indication using a narrowband physical control channel according to the second downlink communication bandwidth mode.
10. The base station of claim 8 , wherein the processor is further configured to cause the base station to:
advertise a first coverage mode supported by the base station.
11. The base station of claim 10 , wherein the processor is further configured to cause the base station to:
indicate a first signal strength range associated with the first coverage mode.
12. The base station of claim 10 , wherein the processor is further configured to cause the base station to:
indicate a first signal quality range associated with the first coverage mode.
13. The base station of claim 8 , wherein the processor is further configured to cause the base station to:
receive, from the wireless device, an indication of a second preferred uplink communication bandwidth mode; and
communicate with the wireless device using the second preferred uplink communication bandwidth mode.
14. The base station of claim 8 , wherein at least one of a maximum uplink communication bandwidth or a maximum downlink communication bandwidth is configured separately from a coverage mode.
15. A method for operating a base station, the method comprising:
at the base station:
establishing a radio resource control (RRC) connection with a wireless device served by a serving cell provided by the base station;
receiving a first RRC message from the wireless device, wherein the first RRC message comprises a first indication of a preferred uplink communication bandwidth mode and a second indication of a preferred downlink communication bandwidth mode;
wherein the preferred uplink communication bandwidth mode is one of a plurality of uplink communication bandwidth modes, wherein the preferred uplink communication bandwidth mode comprises a first maximum uplink communication bandwidth for a physical uplink shared channel (PUSCH) of the serving cell, wherein at least one of the plurality of uplink communication bandwidth modes comprises a maximum uplink communication bandwidth of 1.4 MHz;
wherein the preferred downlink communication bandwidth mode is one of a plurality of downlink communication bandwidth modes, wherein the preferred downlink communication bandwidth mode comprises a first maximum downlink communication bandwidth for a physical downlink shared channel (PDSCH) of the serving cell, wherein at least one of the plurality of downlink communication bandwidth modes comprises a maximum downlink communication bandwidth of 1.4 MHz;
transmitting, to the wireless device, a second RRC message configuring and confirming the preferred uplink communication bandwidth mode and the preferred downlink communication bandwidth mode in response to the first RRC message; and
communicating data with the wireless device using the preferred uplink communication bandwidth mode and the preferred downlink communication bandwidth mode.
16. The method of claim 15 , the method further comprising:
when the wireless device is in a connected mode of operation after establishing the RRC connection with the wireless device, communicating with the wireless device in a second uplink communication bandwidth mode and a second downlink communication bandwidth mode, wherein the second uplink and downlink communication bandwidth modes are limited, respectively, to the maximum uplink communication bandwidth of 1.4 MHz and the maximum downlink communication bandwidth of 1.4 MHz; and
when the wireless device is in an idle mode of operation after establishing the RRC connection with the wireless device, transmitting, to the wireless device, a paging indication using a narrowband physical control channel according to the second downlink communication bandwidth mode.
17. The method of claim 15 , the method further comprising:
advertising a first coverage mode supported by the base station.
18. The method of claim 17 , the method further comprising:
indicating a first signal strength range associated with the first coverage mode.
19. The method of claim 15 , the method further comprising:
receiving, from the wireless device, an indication of a second preferred uplink communication bandwidth mode; and
communicating with the wireless device using the second preferred uplink communication bandwidth mode.
20. The method of claim 15 , wherein at least one of a maximum uplink communication bandwidth or a maximum downlink communication bandwidth is configured separately from a coverage mode.