TTI switching

Patent metadata

Field	Value
Publication number	US-9591618-B2
Application number	US-201414382254-A
Country	US
Kind code	B2
Filing date	Apr 10, 2014
Priority date	May 21, 2013
Publication date	Mar 7, 2017
Grant date	Mar 7, 2017

Abstract

A radio network controller, RNC, keeps control of how many users to configure on a first transmission time interval, TTI, and how many to configure on a second TTI. For example, a method is performed by the RNC, for configuring at least one radio bearer between a radio base station, RBS, and wireless communication devices. The method comprises sending, from the RNC to the RBS, radio bearer configuration information for controlling a distribution between a first number of wireless communication devices and a second number of wireless communication devices where the first number of wireless communication devices are operating a radio bearer using a first TTI, and the second number of wireless communication devices are operating a radio bearer using a second TTI.

First claim

The invention claimed is:

1. A method performed by a radio base station operating in a wireless communication network, comprising:
receiving a transmission time interval (TTI) switch trigger from a wireless communication device that is connected to the radio base station, the switch trigger requesting that the wireless communication device be switched from a first TTI configuration to a second TTI configuration, the first TTI configuration defined by TTIs of a first length, and the second TTI configuration defined by TTIs of a second length, different than the first length; and
in response to the TTI switch trigger, controlling whether the wireless communication device is switched to the second TTI configuration, based on a radio bearer configuration indicating maximum numbers of wireless communication devices that can be configured with the first and second TTI configurations, respectively.

2. The method of claim 1 , further comprising, in response to deciding to switch the wireless communication device to the second TTI configuration, sending information to a radio network controller (RNC), indicating that the wireless communication device is to be switched to the second TTI configuration.

3. The method of claim 1 , further comprising, in response to deciding to switch the wireless communication device to the second TTI configuration, sending a high-speed shared control channel (HS-SCCH) order to the wireless communication device, ordering the switch.

4. The method of claim 1 , further comprising receiving the radio bearer configuration information from a radio network controller (RNC) associated with the radio base station.

5. The method of claim 4 , further comprising:
analyzing a status of radio bearers that reflects TTI switch triggers received from wireless communication devices connected to the radio base station;
determining from said analyzing that the maximum numbers of wireless communication devices that can be configured with the first and second TTI configurations should be adjusted; and
sending an adjustment recommendation to the RNC.

6. The method of claim 5 , wherein the adjustment recommendation comprises at least one of a recommended new maximum number of wireless devices that can use the first TTI configuration while being served by the radio base station, and a recommended new maximum number of wireless devices that can use the second TTI configuration while being served by the radio base station.

7. The method of claim 6 , further comprising determining at least one of the recommended new maximum numbers based on receiving a threshold number of TTI switch triggers from wireless communication devices being served by the radio base station.

8. The method of claim 1 , wherein the first TTI configuration comprises a TTI length of 2 milliseconds, and wherein the second TTI configuration comprises a TTI length of 10 milliseconds.

9. A radio base station configured to operate in a wireless communication network, the radio base station comprising:
a transceiver circuit configured to receive a transmission time interval (TTI) switch trigger from a wireless communication device that is connected to the radio base station, the switch trigger requesting that the wireless communication device be switched from a first TTI configuration to a second TTI configuration, the first TTI configuration defined by TTIs of a first length, and the second TTI configuration defined by TTIs of a second length, different than the first length;
and

a processing circuit configured to, in response to the TTI switch trigger, control whether the wireless communication device is switched to the second TTI configuration, based on a radio bearer configuration indicating maximum numbers of wireless communication devices that can be configured with the first and second TTI configurations, respectively.

10. The radio base station of claim 9 , wherein the control and processing circuit is configured to, in response to deciding to switch the wireless communication device to the second TTI configuration, send information to a radio network controller (RNC), indicating that the wireless communication device is to be switched to the second TTI configuration.

11. The radio base station of claim 9 , wherein the control and processing circuit is configured to, in response to deciding to switch the wireless communication device to the second TTI configuration, send a high-speed shared control channel (HS-SCCH) order to the wireless communication device, ordering the switch.

12. The radio base station of claim 9 , wherein the transceiver circuit is configured to receive the radio bearer configuration information from a radio network controller (RNC) associated with the radio base station.

13. The radio base station of claim 12 , wherein the control and processing circuit is configured to:
analyze a status of radio bearers that reflects TTI switch triggers received from wireless communication devices connected to the radio base station;
determine from said analyzing that the maximum numbers of wireless communication devices that can be configured with the first and second TTI configurations should be adjusted; and
send an adjustment recommendation to the RNC.

14. The radio base station of claim 13 , wherein the adjustment recommendation comprises at least one of a recommended new maximum number of wireless devices that can use the first TTI configuration while being served by the radio base station, and a recommended new maximum number of wireless devices that can use the second TTI configuration while being served by the radio base station.

15. The radio base station of claim 14 , wherein the control and processing circuit is configured to determine at least one of the recommended new maximum numbers based on receiving a threshold number of TTI switch triggers from wireless communication devices being served by the radio base station.

16. The radio base station of claim 9 , wherein the first TTI configuration comprises a TTI length of 2 milliseconds, and wherein the second TTI configuration comprises a TTI length of 10 milliseconds.

17. A non-transitory computer-readable storage medium storing a computer program comprising program instructions that, when executed on at least one processor of a radio base station, cause the radio base station to:
receive a transmission time interval (TTI) switch trigger from a wireless communication device that is connected to the radio base station, the switch trigger requesting that the wireless communication device be switched from a first TTI configuration to a second TTI configuration, the first TTI configuration defined by TTIs of a first length, and the second TTI configuration defined by TTIs of a second length, different than the first length; and
in response to the TTI switch trigger, control whether the wireless communication device is switched to the second TTI configuration, based on a radio bearer configuration indicating maximum numbers of wireless communication devices that can be configured with the first and second TTI configurations, respectively.

Assignees

• Ericsson Telefon Ab L M
• ERICSSON TELEFON AB L M (publ)

Inventors

• Shi Nianshan
• Caverni Alessandro
• Hogan Billy
• Kwong Waikwok
• Pradas Jose Luis

Classifications

• H04W72/20 Primary

  Control channels or signalling for resource management · CPC title

• H04W72/23

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04W72/0446

  Resources in time domain, e.g. slots or frames · CPC title

• H04W28/16 Primary

  Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service] · CPC title

• H04W88/12

  Access point controller devices · CPC title