WO2011124009A1

WO2011124009A1 - Method and device for activating carrier component used for handover of user equipment

Info

Publication number: WO2011124009A1
Application number: PCT/CN2010/071559
Authority: WO
Inventors: 杨涛; 利姆·苏西安; 沃拉尔·钱德瑞卡
Original assignee: 上海贝尔股份有限公司; 阿尔卡特朗讯
Priority date: 2010-04-06
Filing date: 2010-04-06
Publication date: 2011-10-13
Also published as: CN102823291A; CN102823291B; TW201208411A; TWI448175B

Abstract

A method and a device for activating a carrier component of a user equipment used for handover in a wireless communication network are provided by the present invention. The method for activating a carrier component of the present invention includes: sending carrier component information about a plurality of uplink carrier components to a user equipment, the information being included in a handover command; activating one of the uplink carrier components selected by the user equipment; and activating a downlink carrier component matched to the one of the selected uplink carrier components automatically, so as to enable the user equipment to access a target cell. In accordance with the present invention, an uplink carrier component with a best matched downlink carrier component is selected, so as to improve the performance of the message 2/4.

Description

Method and apparatus for activating a carrier component of a user equipment for handoff

The present invention relates to access technologies, and more particularly to a method and apparatus for activating a carrier component of a user equipment for handoff in a wireless communication network. Background technique

In a Long Term Evolution (LTE) wireless communication network, a user equipment can only support one uplink carrier component (CC). Since the resources of the uplink access channel are limited, the user equipment capable of simultaneously accessing one cell is also limited. A conflict occurs when too many user equipments compete for limited access channel resources to send access requests. A user equipment that fails to send an access request needs to resend the access request.

In a Long Term Evolution-Advanced (LTE-A) wireless communication network, a wide bandwidth of up to 100M will be used to provide higher data transmission rates. For backward compatibility, the 100M bandwidth will be divided into multiple carrier components, with each carrier component having a maximum bandwidth of 20M. Each macro cell can support up to 5 carrier components. Therefore, for a user equipment in an LTE-A system, five carrier components can be used.

Carrier Aggregation (CA) is a technique in LTE-A that serves a user equipment by aggregating multiple carriers. In carrier aggregation techniques, when handoffs are performed, the target cell may need to support up to 5 downlink/uplink carrier components. All downlink/uplink carrier components for this user equipment are inactive before the user equipment performs access to the target cell. Therefore, how to activate the carrier component of the user equipment for handover and how to select the carrier component is a problem to be solved. Summary of the invention

In view of the problems in the prior art, the present invention provides a method and apparatus for activating a carrier component of a user equipment for handover in a wireless communication network. According to an embodiment of the present invention, a method for activating a carrier component is provided, including:

Transmitting, to the user equipment, carrier component information about a plurality of uplink carrier components included in the handover command;

Activating one of the uplink carrier components selected by the user equipment; automatically activating a downlink carrier component paired with the selected one of the uplink carrier components to cause the user equipment to access the target cell.

According to an embodiment of the present invention, a method for activating a carrier component is provided, including:

Receiving, from the base station, carrier component information about a plurality of uplink carrier components included in the handover command;

Selecting one of the plurality of uplink carrier components based on the carrier component information;

The target cell is accessed when the selected one of the uplink carrier components and its paired downlink carrier component are activated.

According to an embodiment of the present invention, a method for selecting an uplink carrier component for transmission is provided, including:

Determining, from the activated uplink carrier component, an uplink carrier component to which the paired downlink carrier component is activated;

Selecting from the determined uplink carrier component for a physical random access channel

The uplink carrier component of the PRACH transmission.

In accordance with an embodiment of the present invention, a method of declaring an uplink radio link failure is provided, including:

Detecting that an uplink carrier component for a physical random access channel PRACH transmission fails;

In response to detecting the failure, the uplink radio link is declared to fail and the reconnection process is triggered.

According to an embodiment of the present invention, an apparatus for activating a carrier component is provided, including: Transmitting means, configured to send, to the user equipment, carrier component information about a plurality of uplink carrier components included in the handover command; and

An activation device, configured to activate one of the uplink carrier components selected by the user equipment;

The activation device automatically activates a downlink carrier component paired with the selected one of the uplink carrier components to cause the user equipment to access the target cell.

According to an embodiment of the present invention, a device for activating a carrier component is provided, including:

a receiving device, configured to receive, from the base station, carrier component information about a plurality of uplink carrier components included in the handover command;

a selecting means, configured to select one of the uplink carrier components of the plurality of uplink carrier components based on the carrier component information;

And an access device, configured to access the target cell when the selected one of the uplink carrier components and the paired downlink carrier component thereof are activated.

According to an embodiment of the present invention, there is provided an apparatus for selecting an uplink carrier component for transmission, comprising:

Determining means for determining, from the activated uplink carrier component, an uplink carrier component to which the paired downlink carrier component is activated;

And selecting means for selecting an uplink carrier component for the physical random access channel PRACH transmission from the determined uplink carrier components.

In accordance with an embodiment of the present invention, an apparatus for claiming an uplink radio link failure is provided, comprising:

a detecting device, configured to detect that an uplink carrier component for a physical random access channel PRACH transmission fails;

Declaring means for declaring an uplink radio link failure in response to detecting the failure and triggering a reconnection process. DRAWINGS

A detailed description of the non-limiting embodiments made with reference to the following drawings, Other features, objects, and advantages of the present invention will become more apparent.

1 shows a flow chart of a method of activating a carrier component in a wireless communication network, in accordance with one embodiment of the present invention;

2 shows a flow chart of a method of activating a carrier component in a base station of a wireless communication network, in accordance with one embodiment of the present invention;

3 shows a flow chart of a method of activating a carrier component in a user equipment of a wireless communication network, in accordance with one embodiment of the present invention;

4 shows a flow diagram of a method for a user equipment to select an uplink carrier component for transmission, in accordance with one embodiment of the present invention;

Figure 5 illustrates a flow diagram of a method of asserting an uplink radio link failure in accordance with one embodiment of the present invention;

Figure 6 shows a block diagram of a base station for activating carrier components in accordance with one embodiment of the present invention;

Figure 7 shows a block diagram of a user equipment for activating a carrier component in accordance with one embodiment of the present invention;

Figure 8 shows a block diagram of a user equipment for a method of selecting an uplink carrier component for transmission, in accordance with one embodiment of the present invention;

Figure 9 is a block diagram showing a user equipment declaring an uplink radio link failure in accordance with one embodiment of the present invention;

Figure 10 shows a block diagram of a wireless communication network for activating carrier components in accordance with one embodiment of the present invention. detailed description

A method and apparatus for activating a carrier component in a wireless communication network in accordance with the present invention will now be described with reference to the drawings and with reference to the specific embodiments.

One embodiment of the present invention provides a method and apparatus for activating a carrier component of a user equipment for handoff in a wireless communication network. In the handover command, multiple carrier component information may be indicated for the user equipment to access. The user equipment may select one of the carrier components to perform collision-based or collision-free for the target cell. Access. The paired downlink carrier component based on the second system information block (SIB 2 ) information or the dedicated signaling query of the user equipment is automatically activated for temporary use in random access response (RAR) transmission and reception. After successful access, the uplink carrier component for the access and its paired downlink carrier component are activated. At the same time, the other downlink/uplink carrier components for the user equipment are in an inactive state. The target cell then activates other downlink/uplink carrier components through Media Access Control (CMAC) signaling that can be sent in message 4 or later.

1 shows a flow diagram of a method of activating a carrier component in a wireless communication network, in accordance with one embodiment of the present invention. The wireless communication network includes a plurality of base stations, wherein each base station provides services for a plurality of user equipments (UEs). According to Fig. 1, in step 101, carrier component information on a plurality of uplink carrier components included in the handover command is transmitted to the user equipment. In step 102, the carrier component information about the plurality of uplink carrier components included in the handover command is received from the base station. In step 103, the user equipment selects one of the plurality of uplink carrier components based on the carrier component information. In step 104, the base station automatically activates one of the uplink carrier components selected by the user equipment. In step 105, the base station activates a downlink carrier component that is paired with the selected one of the uplink carrier components. In step 106, the user equipment accesses the target cell when the selected one of the uplink carrier components and its paired downlink carrier component are activated.

In an LTE-A wireless communication network, a base station is also referred to as an eNodeB (i.e., an eNB). 2 shows a flow diagram of a method of activating a carrier component at a base station of a wireless communication network, in accordance with one embodiment of the present invention. According to Fig. 2, in step 201, carrier component information on a plurality of uplink carrier components contained in the handover command is transmitted to the user equipment. In step 202, one of the uplink carrier components selected by the user equipment is activated. In step 203, a downlink carrier component paired with the selected one of the uplink carrier components is activated to cause the user equipment to access the target cell.

In an embodiment, after the user equipment accesses the target cell, activate the remaining uplink carrier component of the multiple uplink carrier components and match the same The downlink carrier component of the pair.

In one embodiment, the remaining uplink carrier components of the plurality of uplink carrier components and the downlink carrier components paired therewith are activated by medium access control signaling.

In one embodiment, the downlink carrier component paired with the selected one of the uplink carrier components is queried by SIB2 information or dedicated signaling of the user equipment to activate the downlink carrier component.

3 shows a flow diagram of a method of activating a carrier component in a user equipment of a wireless communication network, in accordance with one embodiment of the present invention. According to Fig. 3, in step 301, carrier component information on a plurality of uplink carrier components included in the handover command is received from the base station. In step 302, one of the plurality of uplink carrier components is selected based on the carrier component information. In step 303, the target cell is accessed when the selected one of the uplink carrier components and its paired downlink carrier component are activated.

A method for selecting an uplink carrier component for use in a PRACH transmission in a wireless communication network in accordance with an embodiment of the present invention is described below.

4 shows a flow diagram of a method for a user equipment to select an uplink carrier component for transmission, in accordance with one embodiment of the present invention. According to Fig. 4, in step 401, an uplink carrier component whose paired downlink carrier component is activated is determined from the activated uplink carrier components. In step 402, an uplink carrier component for physical random access channel PRACH transmission is selected from the determined uplink carrier components.

According to one embodiment of the invention, the uplink carrier component for PRACH transmission is selected by one of the following ways:

(1) The user equipment selects an uplink carrier component with an activated paired downlink carrier component, and the uplink carrier component provides the earliest PRACH transmission slot to accelerate the PRACH process. If there are multiple such uplink carrier components, the uplink carrier component with the best pairing activated may be selected first;

(2) The user equipment can randomly select the uplink carrier component, the only requirement In that the paired downlink carrier component of the selected uplink carrier component should also be activated.

In one embodiment, the selecting step further comprises: selecting an uplink carrier component providing the earliest transmission time slot to accelerate the PRACH process.

In one embodiment, the selecting step further comprises: selecting an uplink carrier component having the best pairing when there are a plurality of the uplink carrier components.

In accordance with the above manner, it is important to select the uplink carrier component for PRACH transmission, e.g., to select the uplink carrier component of the downlink carrier component with the best pairing to improve the performance of Message 2/4.

In one embodiment, the selecting step further comprises: randomly selecting an uplink carrier component for the PRACH transmission from the determined uplink carrier component.

As can be seen from the above embodiments, regardless of which of the above approaches is required, the user equipment is required to perform PRACH transmission on the uplink carrier component with the activated paired downlink carrier component.

According to an embodiment of the present invention, when the downlink carrier component is in a deactivated state, one of the following two processing modes may be selected:

(1) There is no need to perform PRACH access on the remaining uplink carrier components because the paired downlink carrier components are in a deactivated state. The user equipment declares the uplink radio link failure (UL RLF) and triggers the reconnection process;

(2) Continuing to perform PRACH transmission on the uplink carrier component with the deactivated paired downlink carrier component regardless of the state of its paired downlink carrier component. In this case, the base station transmits a random access response (RAR) downward, and the user equipment receives the RAR, thereby activating the downlink carrier component. Thus, the deactivated downlink carrier component is activated for the purpose of PRACH transmission.

In an embodiment, if the uplink carrier component for the physical random access channel PRACH transmission is not selected from the determined uplink carrier component in step 402, step 403 is performed, that is, never satisfied. An uplink carrier component for PRACH transmission is selected among the remaining activated uplink carrier components of the determined condition. In one embodiment, upon selection of an uplink carrier component for PRACH transmission from the determined uplink carrier component, the uplink radio link is asserted to fail and the reconnection procedure is triggered.

Figure 5 illustrates a flow diagram of a method of asserting an uplink radio link failure in accordance with one embodiment of the present invention. According to Fig. 5, in step 501, an uplink carrier component for detecting a physical random access channel PRACH transmission is detected to be faulty. In step 502, in response to detecting the failure, the uplink radio link is declared to fail and the reconnection process is triggered.

In one embodiment, an uplink carrier component with a configured PRACH is selected to perform a PRACH transmission. If the PRACH transmission on the uplink carrier component fails, the user equipment is not required to continue to try on other carrier components, but instead the uplink radio link fails and a reconnection is triggered. This approach is advantageous in situations where all active uplink carrier components are in poor condition, as the user equipment is not required to continue to try on other carrier components, thereby wasting time.

In an embodiment, when the physical uplink control channel (PUCCH) cannot be transmitted on the uplink primary carrier component (UL PCC), it can be considered that normal communication between the base station and the user equipment cannot be guaranteed, thereby declaring the uplink. The radio link of the road fails and triggers the reconnection process.

Figure 6 shows a block diagram of a base station for activating carrier components in accordance with one embodiment of the present invention. The base station 600 shown in FIG. 6 includes a transmitting device 601 and an activation device 602. In the embodiment shown in Fig. 6, the transmitting means 601 transmits carrier component information on a plurality of uplink carrier components contained in the handover command to the user equipment. The activation device 602 activates one of the uplink carrier components selected by the user equipment, and automatically activates a downlink carrier component paired with the selected one of the uplink carrier components to enable the user equipment to access Target cell.

In an embodiment, after the user equipment accesses the target cell, the activation device 602 activates a remaining uplink carrier component of the plurality of uplink carrier components and a downlink carrier paired therewith Component.

In one embodiment, the plurality of uplinks are activated by medium access control signaling The remaining uplink carrier component of the way carrier component and the downlink carrier component paired therewith.

Figure 7 shows a block diagram of a user equipment for activating a carrier component in accordance with one embodiment of the present invention. The user equipment 700 shown in FIG. 7 includes a receiving device 701, a selecting device 702, and an access device 703. In the embodiment shown in Fig. 7, the receiving apparatus 701 receives, from the base station, carrier component information on a plurality of uplink carrier components included in the handover command. Selection device 702 selects one of the plurality of uplink carrier components based on the carrier component information. Access device 703 accesses the target cell when one of the selected uplink carrier components and its paired downlink carrier component is activated.

Figure 8 shows a block diagram of a user equipment 800 for a method of selecting an uplink carrier component for transmission, in accordance with one embodiment of the present invention. The user equipment 800 shown in FIG. 8 includes a determining device 801 and a selecting device 802. In the embodiment illustrated in Figure 8, determining means 801 determines from the activated uplink carrier components the uplink carrier component to which the paired downlink carrier component is activated. The selecting means 802 selects an uplink carrier component for the physical random access channel PRACH transmission from the determined uplink carrier components.

In one embodiment, the selection device 802 selects an uplink carrier component that provides the earliest transmission slot to accelerate the PRACH process.

In one embodiment, the selection device 802 selects the downlink carrier component with the best pairing when there are multiple of the downlink carrier components.

In one embodiment, the selecting means 802 randomly selects an uplink carrier component for PRACH transmission from the determined uplink carrier components.

In an embodiment, the user equipment 800 further includes a second selecting means 803 for never satisfying when the uplink carrier component for the PRACH transmission is not selected from the determined uplink carrier component. Determining the remaining activation uplink of the piece An uplink carrier component for PRACH transmission is selected among the link carrier components.

In one embodiment, the user equipment 800 further includes declaring means for declaring the uplink radio chain when no uplink carrier component for the PRACH transmission is selected from the determined uplink carrier component The road fails and triggers the reconnection process.

Figure 9 shows a block diagram of an apparatus for asserting an uplink radio link failure in accordance with one embodiment of the present invention. The user equipment 900 shown in FIG. 9 includes a detecting device 901 and a declaring device 902. In the embodiment shown in Fig. 9, the detecting means 901 detects that the uplink carrier component for the physical random access channel PRACH transmission has failed. The claim device 902, in response to detecting the failure, declares that the uplink radio link failed and triggers the reconnection process.

In one embodiment, when the physical uplink control channel (PUCCH) cannot be transmitted on the uplink primary carrier component (UL PCC), it can be considered that normal communication between the base station and the user equipment cannot be guaranteed, and the declaring device 902 declares The uplink radio link fails and triggers the reconnection process.

Figure 10 shows a block diagram of a wireless communication network for activating carrier components in accordance with one embodiment of the present invention. In one embodiment of the invention, a wireless communication network includes a plurality of base stations, wherein each base station provides service to a plurality of user equipments. As shown in FIG. 10, the wireless communication network includes a base station 600 including a transmitting device 601 and an activation device 602, and a user device 700 including a receiving device 701, a selecting device 702, and an access device 703.

In an embodiment of the present invention, the transmitting device 601 transmits a carrier for a plurality of uplink carrier components included in the handover command to the receiving device 701 of the user equipment. Component information. The selecting means 702 selects one of the plurality of uplink carrier components based on the carrier component information. Activation device 602 activates one of the uplink carrier components selected by selection device 702 and its paired downlink carrier components. The access device 703 accesses the target cell when the selected one of the uplink carrier components and its paired downlink carrier component are activated.

In one embodiment, activation device 602 activates the remaining uplink carrier components of the plurality of uplink carrier components and the downlink carrier components paired therewith.

The above description of some specific embodiments of the present invention is intended to be within the scope of the present invention without departing from the basic scope of the invention.

Claims

Claim

A method for activating a carrier component, comprising:

2. The method according to claim 1, wherein after the user equipment accesses the target cell, activating the remaining uplink carrier component of the plurality of uplink carrier components and a downlink paired therewith Carrier component.

3. The method of claim 2, wherein the remaining uplink carrier components of the plurality of uplink carrier components and the downlink carrier components paired therewith are activated by medium access control signaling.

4. The method of claim 1, wherein a downlink carrier component paired with the selected one of the uplink carrier components is queried by the second information block information or dedicated signaling of the user equipment.

5. A method for activating a carrier component, comprising:

6. A method of selecting an uplink carrier component for transmission, comprising: determining, from an activated uplink carrier component, an uplink carrier component to which a paired downlink carrier component is activated;

An uplink carrier component for physical random access channel PRACH transmission is selected from the determined uplink carrier components.

7. The method of claim 6, wherein the selecting step further comprises: selecting an uplink carrier component providing the earliest transmission slot to accelerate the PRACH process.

8. The method of claim 6 or 7, wherein the selecting step further comprises: selecting an uplink carrier component having the best pairing when there are a plurality of the uplink carrier components.

9. The method of claim 6, wherein the selecting step further comprises: randomly selecting one of the determined uplink carrier components for

The uplink carrier component of the PRACH transmission.

10. The method of claim 6, wherein the method further comprises: when the uplink carrier component for PRACH transmission is not selected from the determined uplink carrier component, never satisfying the The uplink carrier component for PRACH transmission is selected from among the remaining activated uplink carrier components that determine the condition.

1 1. The method according to claim 6, wherein the method further comprises: declaring an uplink when no uplink carrier component for PRACH transmission is selected from the determined uplink carrier component The radio link fails and triggers the reconnection process.

12. A method of declaring an uplink radio link failure, comprising:

13. A device for activating a carrier component, comprising:

Transmitting means, configured to send carrier component information about a plurality of uplink carrier components included in the handover command to the user equipment;

14. The apparatus of claim 13, wherein the activation device activates and pairs with a remaining uplink carrier component of the plurality of uplink carrier components after the user equipment accesses the target cell Downlink carrier component.

15. The apparatus of claim 14, wherein the remaining uplink carrier components of the plurality of uplink carrier components and the downlink carrier components paired therewith are activated by medium access control signaling.

16. The apparatus of claim 13, wherein a downlink carrier component paired with the selected one of the uplink carrier components is queried by the second information block information or dedicated signaling of the user equipment.

17. A device for activating a carrier component, comprising:

Selecting means for selecting one of the plurality of uplink carrier components based on the carrier component information;

18. An apparatus for selecting an uplink carrier component for transmission, comprising: determining means for determining, from an activated uplink carrier component, an uplink carrier component to which a paired downlink carrier component is activated ;

19. Apparatus according to claim 18, wherein said selecting means selects an uplink carrier component providing the earliest transmission slot to accelerate the PRACH procedure.

20. Apparatus according to claim 18 or 19, wherein said selecting means selects an uplink carrier component having the best pairing when there are a plurality of said uplink carrier components.

21. The apparatus of claim 18, wherein the selecting means randomly selects an uplink carrier component for PRACH transmission from the determined uplink carrier component.

22. The apparatus according to claim 18, further comprising second selecting means for never selecting an uplink carrier component for P ACH transmission from said determined uplink carrier component An uplink carrier component for PRACH transmission is selected among the remaining activated uplink carrier components that satisfy the determined condition.

23. The apparatus of claim 18, further comprising declaring means for declaring an uplink when an uplink carrier component for PRACH transmission is not selected from the determined uplink carrier component The radio link failed and triggered the reconnection process.

24. An apparatus for claiming an uplink radio link failure, comprising: detecting means for detecting an uplink carrier component failure for a physical random access channel PRACH transmission;

Declaring means for declaring an uplink radio link failure in response to detecting the failure and triggering a reconnection process.