Mobile station and radio base station for “always-on” method

Patent metadata

Field	Value
Publication number	US-9320056-B2
Application number	US-201314418219-A
Country	US
Kind code	B2
Filing date	Jul 17, 2013
Priority date	Jul 31, 2012
Publication date	Apr 19, 2016
Grant date	Apr 19, 2016

Abstract

When an “always-on” method is applied, a situation of a shortage in resources for transmitting a SR is avoided while avoiding a delay in transmission of an uplink data signal or a drop in use efficiency of resources. A mobile station (UE) of the invention includes a transmission unit ( 23 ) configured, when resources for a collision-type SR to be shared with a different mobile station (UE) are set up, to transmit a collision-type SR including an identifier of the mobile station (UE) by using the resources for a collision-type SR. When no resources for an uplink data signal are allocated for the collision-type SR, the transmission unit ( 23 ) is configured to retransmit the collision-type SR by using the resources for a collision-type SR.

First claim

The invention claimed is:

1. A mobile station comprising:
a transmission unit configured when resources for a collision-type scheduling request signal to be shared with a different mobile station are set up, to transmit the collision-type scheduling request signal including an identifier of the mobile station by using the resources for the collision-type scheduling request signal, wherein
when no resources for an uplink data signal are allocated in response to the collision-type scheduling request signal, the transmission unit is configured to retransmit the collision-type scheduling request signal by using the resources for the collision-type scheduling request signal, and
when the resources for the collision-type scheduling request signal and resources for an individual scheduling request signal dedicated for the mobile station are both set up, the transmission unit is configured to transmit a scheduling request signal not including the identifier of the mobile station by using the resources for an individual scheduling request signal.

2. The mobile station according to claim 1 , wherein
when the number of times of transmission of the collision-type scheduling request signal reaches a predetermined number of times of transmission, the transmission unit is configured to stop retransmission of the collision-type scheduling request signal.

3. A mobile station comprising:
a transmission unit configured, when resources for a collision-type scheduling request signal to be shared with a different mobile station are set up, to transmit the collision-type scheduling request signal including an identifier of the mobile station by using the resources for the collision-type scheduling request signal, wherein
when no resources for an uplink data signal are allocated in response to the collision-type scheduling request signal, the transmission unit is configured to retransmit the collision-type scheduling request signal by using the resources for the collision-type scheduling request signal, and
when the resources for the collision-type scheduling request signal and resources for an individual scheduling request signal dedicated for the mobile station are both set up, the transmission unit is configured to determine which of the resources for the collision-type scheduling request signal and the resources for an individual scheduling request signal are supposed to be used on the basis of a type of an uplink data signal to be transmitted.

4. The mobile station according to claim 2 , wherein when the number of times of transmission of the collision-type scheduling request signal reaches a predetermined number of times of transmission, the transmission unit is configured to stop retransmission of the collision-type scheduling request signal.

5. A mobile station comprising:
a transmission unit configured, when resources for a collision-type scheduling request signal to be shared with a different mobile station are set up, to transmit the collision-type scheduling request signal including an identifier of the mobile station by using the resources for the collision-type scheduling request signal, wherein
when no resources for an uplink data signal are allocated in response to the collision-type scheduling request signal, the transmission unit is configured to retransmit the collision-type scheduling request signal by using the resources for the collision-type scheduling request signal; and
a control unit configured not to release the resources for the collision-type scheduling request signal even if a predetermined timer is expired or if the number of times of retransmission of the collision-type scheduling request signal exceeds a maximum number of retransmissions, wherein
when the resources for the collision-type scheduling request signal and resources for an individual scheduling request signal dedicated for the mobile station are both set up, the control unit is configured to release the resources for the individual scheduling request signal if the predetermined timer is expired or if the number of times of retransmission of the collision-type scheduling request signal exceeds the maximum number of retransmissions.

6. The mobile station according to claim 5 , wherein when the number of times of transmission of the collision-type scheduling request signal reaches a predetermined number of times of transmission, the transmission unit is configured to stop retransmission of the collision-type scheduling request signal.

Assignees

• Ntt Docomo Inc

Inventors

• Uchino Tooru
• Hapsari Wuri Andarmawanti

Classifications

• H04W72/21

  in the uplink direction of a wireless link, i.e. towards the network · CPC title

• H04W74/08 Primary

  Non-scheduled access, e.g. ALOHA (hybrid access H04W74/02) · CPC title

• H04W74/04 Primary

  Scheduled access (hybrid access H04W74/02) · CPC title

• H04W72/1284

  Electricity · mapped topic

• H04W76/046

  Electricity · mapped topic