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Wireless Communication System, Wireless Terminals, Wireless Base Stations, Wireless Communication Method

A wireless communication system and wireless terminal technology, which is applied in the field of wireless communication systems, can solve problems such as unavailability, and achieve the effect of reducing power consumption

Active Publication Date: 2015-04-08
NEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] As a result, in the seventh and eighth DRX cycles, only CC2 can be used, and CC1 and CC3 cannot be used due to the long DRX non-reception period

Method used

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  • Wireless Communication System, Wireless Terminals, Wireless Base Stations, Wireless Communication Method
  • Wireless Communication System, Wireless Terminals, Wireless Base Stations, Wireless Communication Method
  • Wireless Communication System, Wireless Terminals, Wireless Base Stations, Wireless Communication Method

Examples

Experimental program
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Effect test

no. 1 example

[0121] Figure 7 It is a diagram showing a state of DRX for each component carrier of a radio terminal (UE) for explaining the first example corresponding to the first embodiment.

[0122] In this embodiment, the DRX Short Cycle Timer is activated in each component carrier (CC), and transitions from Short DRX to Long DRX when the DRX Short Cycle Timer expires in all the CCs. Here, the terminal is first in the short DRX state, and the length of the DRX short cycle timer is set to be three times the short DRX cycle.

[0123] In the first DRX cycle (counted in Short DRX), the DRX Short Cycle Timer is started in all component carriers. Since data reception is not performed on the component carrier 2 (CC 2 ), it shifts to the non-reception period (Opportunity for DRX) only after receiving the PDCCH in the continuous period (after confirming that data is not transmitted). On the other hand, in component carrier 1 (CC1) and component carrier 3 (CC 3), data reception is perfo...

no. 2 example

[0150] Figure 11 This is a diagram showing a state of DRX for each component carrier of a radio terminal (UE) for explaining the second example of the first embodiment.

[0151] In this embodiment, the DRX inactivity timer (drx-Inactivity Timer), DRX retransmission timer (drx-Retransmission Timer), and HARQ RTT timer (HARQ RTT Timer) are operated on each component carrier to determine the activation However, the DRX Short Cycle Timer is commonly activated among the component carriers, and the short DRX is switched to the Long DRX when the DRX Short Cycle Timer expires. Here, the UE is first in the short DRX state, and the length of the DRX short cycle timer is set to be three times the short DRX cycle.

[0152] In the first DRX cycle (counting under short DRX), first start the DRX short cycle timer. exist Figure 11 Among them, component carrier 1 and component carrier 3 perform data reception in the first DRX cycle, and component carrier 3 performs longer data rec...

no. 3 example

[0164] Figure 14 It is a diagram illustrating a state of DRX for each component carrier of a wireless terminal (UE) for explaining the third example of the first embodiment.

[0165] In this embodiment, the activation time is determined by operating the DRX inactivity timer, the DRX retransmission timer, and the HARQ RTT timer in each component carrier, and the DRX short cycle timer is operated. And use the CA-DRX short cycle timer associated with the DRX short cycle timer to transfer from short DRX to long DRX when the CA-DRX short cycle timer expires. Here, the UE is first in the short DRX state, and it is assumed that the lengths of the DRX short cycle timer and the CA-DRX short cycle timer are three times the short DRX cycle.

[0166] In the first DRX cycle (counting under short DRX), first start the DRX short cycle timer in all component carriers, and start the CA-DRX short cycle timer at the same time. exist Figure 14 Among them, component carrier 1 and comp...

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PUM

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Abstract

Disclosed is a radio communication system wherein radio terminals can communicate using a plurality of component carriers having different frequencies. The communication system has a reception start timing control means for commonly controlling the cycle of reception start timing for predetermined channels in at least some of the component carriers assigned to the radio terminals; and a reception control means for controlling the reception interval of said predetermined channels, said reception intervals being started at the reception start times in at least some of the component carriers assigned to the radio terminals.

Description

[0001] This application is a divisional application of an invention patent application with an application date of September 30, 2010, an application number of 201080045110.X, and a title of "wireless communication system, wireless terminal, wireless base station, wireless communication method, and program". technical field [0002] The present invention relates to a wireless communication system, a wireless terminal, a wireless base station, a wireless communication method, and a program. Background technique [0003] In 3GPP LTE (Long Term Evolution: Long Term Evolution), which is one of the next-generation cellular systems, a function of supporting Discontinuous Reception (DRX: Discontinuous Reception) of wireless terminals in order to reduce power consumption of wireless terminals (Non-Patent Document 1, 2). In LTE, a period called a discontinuous reception cycle (DRX cycle) is defined, which consists of a reception period (On-Duration, continuous period) and a continuou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W76/04H04W52/02
CPCH04W52/46H04W52/0232H04W72/042H04W76/048H04W72/04H04W52/0216H04W72/0453H04W76/28Y02D30/70H04L5/001H04L1/1848H04L1/1812H04W72/23H04W72/1273
Inventor 二木尚
Owner NEC CORP