WO2011124010A1

WO2011124010A1 - Method and device for timing advance in carrier aggregation wireless network

Info

Publication number: WO2011124010A1
Application number: PCT/CN2010/071560
Authority: WO
Inventors: 杨涛
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: CN102884848B; TWI451788B; TW201208426A; CN102884848A

Abstract

A method for timing advance in carrier aggregation wireless network is provided, and the method includes the steps of: receiving a timing advance indication signaling from one of at least one activated downlink component carrier of at least one downlink component carrier, wherein the timing advance indication signaling includes timing advance information; updating the timing advance shared by all activated uplink component carriers according to the timing advance information, and starting/restarting the timer; determining the uplink transmission time of the present user equipment according to a determined downlink reference component carrier and the updated timing advance. Meanwhile, a method for timing advance in a base station and the device thereof are provided accordingly. The technical solutions of this invention may realize the timing advance between the base station and the user equipment in situation of carrier aggregation, and make the uplink subframes transmitted by the same user equipment in situation of carrier aggregation arrive at the base station synchronously.

Description

Method and apparatus for timing advance in a carrier aggregation wireless network

The present invention relates to wireless network communications, and more particularly to a method and apparatus for timing advancement in base stations and user terminals in a carrier aggregation wireless network. Background technique

At present, in a Long Term Evolution (LTE) system using orthogonal frequency division multiplexing, in order to ensure orthogonality between different user terminals (UEs) that transmit uplink data at the same time, it is necessary to make multiple user terminals The signals are received synchronously at the base station, that is, the signals of the user terminals need to arrive at the base station at the same time. The specific implementation is to ensure that the time error of the data of different user terminals transmitted in the same uplink subframe arrives at the base station in the Cyclic Prefix (CP) range. within. Since the distances of the user terminals from the base station are different, the transmission time of each user terminal needs to be adjusted. The user terminal with a large channel transmission delay is sent earlier, and the user terminal with a small channel transmission delay is sent later. This operation is called Timing Alignment. Specifically, the base station sends an uplink timing advance (TA) to each user terminal, and the user terminal determines, according to the received TA, the start time of transmitting the subsequent uplink subframe.

In the LTE system, the user terminal is configured with only one carrier resource of no more than 20M, and the resources used by all user terminals of the system or the scheduled resources are limited to only one carrier of the LTE system. In LTE-Advanced, carrier aggregation is supported, including continuous carrier aggregation and discontinuous carrier aggregation between in-band and inter-band, and the maximum energy aggregation bandwidth can reach 100 MHz. Therefore, for a certain user terminal, one to five component carriers can be configured, and the resources used by the user terminal or the scheduled resources can also be dispersed on one to five component carriers. This increases the data transmission bandwidth and scheduling flexibility, but there is still no technical solution for improved timing advance on the user terminal side for the carrier aggregation feature of the LTE-A system. Summary of the invention Under the carrier aggregation condition of the LTE-A system, the transmission of the user terminal is scheduled by one or more component carriers, because the transmission delays of different uplink component carriers may be different, thus causing the same user terminal to be in the carrier aggregation scenario. For the technical problem, the present invention proposes a method and apparatus for implementing timing advance in a base station and a user terminal in a wireless network in an application scenario suitable for carrier aggregation.

According to an embodiment of the present invention, a method for timing advance in a user terminal of a carrier aggregation wireless network is provided, where at least one downlink component carrier and at least one uplink component carrier, at least one downlink component are configured in the wireless network The carrier includes a downlink primary component carrier, and all activated uplink component carriers in the at least one uplink component carrier share a timer and a timing advance value, and the method includes the following steps:

Receiving timing advance indication signaling by using one of all activated downlink component carriers in at least one downlink component carrier, the timing advance indication signaling includes timing advance information; updating timing advance value according to timing advance information, and starting/restarting The timer, and determining an uplink transmission time of the user terminal based on the determined downlink reference component carrier and the updated timing advance value.

According to another embodiment of the present invention, there is provided a method for timing advance in a base station of a wireless network, wherein at least one downlink component carrier and at least one uplink component carrier, at least one downlink component carrier are configured in the wireless network The method includes a downlink primary component carrier, and all activated uplink component carriers in the at least one uplink component carrier share a timer and a timing advance value, and the method includes the following steps:

Determining, according to the determined downlink reference component carrier, a timing advance information corresponding to a timing advance value shared by all activated uplink component carriers; and transmitting all activated downlink component carriers in at least one downlink component carrier The one of the activated downlink component carriers is sent with timing advance indication signaling, and the timing advance indication signaling includes the timing advance information.

According to still another embodiment of the present invention, there is provided a device for timing advance in a user terminal of a wireless network, where at least one downlink component carrier and at least one uplink component carrier are configured in the wireless network, at least one uplink component carrier All activated upstream points The quantity carrier shares a timer and a certain time advance value. The device includes:

And an indication signaling receiving module, configured to receive, by using one of the at least one downlink component carrier, a timing advance indication signaling, where the timing advance indication signaling includes a certain time advance information;

a timing advance start module, configured to update the timing advance value according to timing advance information in the timing advance indication signaling, and start/restart the timer;

An uplink transmission time determining module, configured to determine an uplink transmission time of the user terminal based on the determined downlink reference component carrier and the updated timing advance value.

According to still another embodiment of the present invention, there is provided apparatus for timing advance in a base station of a wireless network, wherein the wireless network is configured with at least one downlink component carrier and at least one uplink component carrier, at least one uplink component carrier All activated uplink component carriers share a timer and a certain time advance value, and the device includes:

a timing advance value determining module that determines a timing advance information based on the determined downlink reference component carrier;

And an indication signaling sending module, configured to send timing advance indication signaling by using one of the at least one downlink component carrier, wherein the timing advance indication signaling includes the timing advance information.

The present invention proposes that because the transmission delays of different downlink component carriers may be different, the data transmitted by the same user terminal in the uplink subframe in the carrier aggregation scenario may not be able to reach the base station synchronously within the system cyclic prefix CP range. For the technical problem, the present invention provides a method and apparatus for implementing timing advance in a base station and a user terminal in a wireless network in an application scenario applicable to carrier aggregation, for determining a downlink reference component carrier on both sides of a base station and a user terminal, respectively. And causing the base station to determine the timing advance value for the user terminal, and when the user terminal determines the uplink transmission time, the transmission delay of the downlink reference component carrier on which the base station and the user terminal are respectively based is the same, and therefore, the user terminal can be in the same When receiving the downlink reference signal, the uplink transmission time point is correctly determined according to the timing advance value determined by the base station, so that the timing advance of the user terminal is correctly completed in the carrier aggregation scenario. If the transmission delays of all the activated uplink component carriers are substantially the same, the uplink transmission is performed at the determined uplink transmission time point, and the uplink transmission may be performed. All data in the transmitted uplink subframe arrives at the base station side synchronously within the cyclic prefix (CP) range of the base station side. DRAWINGS

Other features, objects, and advantages of the invention will become apparent from the Detailed Description of Description

1 is a topological structural diagram of a wireless network system composed of a base station and a user terminal according to an embodiment of the present invention;

2 is a flow chart of a method for timing advancement in a user terminal of a wireless network, in accordance with an embodiment of the present invention;

3 is a flow chart of a method for timing advance in a base station of a wireless network, in accordance with an embodiment of the present invention;

4 is a block diagram showing the structure of a timing advance device in a user terminal of a wireless network according to an embodiment of the present invention;

FIG. 5 is a block diagram showing the structure of a timing advance apparatus in a base station of a wireless network according to an embodiment of the present invention; FIG.

Wherein, the same or similar reference numerals denote the same or similar step features or devices (modules). detailed description

The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. 1 is a topological structural diagram of a wireless network system composed of a base station and a user terminal according to an embodiment of the present invention. The communication system includes: a user terminal 11 and a base station 12, and there is uplink and downlink communication between the two, wherein the configuration is One or more uplink and downlink component carriers (not shown in the figure).

First, in step S201, the user terminal 11 receives timing advance indication signaling by one of the downlink component carriers activated by at least one of the at least one downlink component carrier (the signaling Located on the channel between the user terminal 11 and the base station 12 in FIG. 1, not shown in FIG. 1), the timing advance indication signaling includes timing advance information.

Then, in step S20 ² , the user terminal 11 updates the timing advance value shared by all activated uplink component carriers on the user terminal 11 side according to the timing advance information, and starts/restarts all activated uplink components on the user terminal 11 side. The timer shared by the carrier.

Next, in step S203, the user terminal 11 determines the uplink transmission time of the user terminal based on the determined downlink reference component carrier and the updated timing advance value.

Specifically, in some application scenarios of the embodiment of the present invention, there may be no sequence relationship between step S202 and step S203.

3 is a flow chart of a method for timing advance in a base station of a wireless network, in accordance with an embodiment of the present invention.

First, in step S301, the base station 12 determines timing advance information based on the determined downlink reference component carrier.

Then, in step S302, the base station 12 transmits timing advance indication signaling by using one of the downlink component carriers activated by at least one of the at least one downlink component carrier, where the timing advance indication signaling includes the time advance information determined in step S301. .

The user terminal in the carrier aggregation wireless network and the method for timing advance in the base station provided by the present invention will be described in detail below with reference to FIG. 1, FIG. 2 and FIG.

The communication system shown in the topology diagram of the wireless network system comprising the base station and the user terminal in FIG. 1 includes: a user terminal 11 and a base station 12. It is assumed that four uplink component carriers are configured on the uplink and downlink channels of the communication system: CCU1, CCU2, CCU3, and CCU4, wherein the uplink component carriers that are active in the initial stage of system operation are: CCU1, CCU2, CCU3, and the above three The uplink component carriers share a timer timer and a timing advance value TA.

At the same time, four downlink component carriers are configured on the downlink channel of the communication system: CCD1, CCD2, CCD3, CCD4, wherein the downlink component carriers that are active in the initial stage of the system operation are: CCD1, CCD2, CCD3, at this time, The downlink primary component carrier (DL Primary CO is configured as: CCD3.

The bandwidth of the above component carriers may be different according to application scenarios, and the size of each carrier does not exceed 20M. In one embodiment, the activated component carriers are located on different frequency bands or on discontinuous frequencies with large frequency offsets, or because some frequencies are forwarded by the repeater, while others are at the base station and the user terminal. Direct transmission, these conditions cause a large difference in transmission delay between the downlink component carriers CCD1, CCD2, and CCD3. For example, the difference between the transmission delays of the downlink component carriers CCD1, CCD2 is numerically greater than a predetermined value, such as the cyclic prefix CP. At this time, first, the base station 12 performs step S301: determining timing advance information based on the determined downlink reference component carrier of the base station 12. Here, the downlink primary component carrier CCD3 is configured as a downlink reference component carrier by default when the system is started, and the determination information of the downlink reference component carrier CCD3 is explicitly notified to the user terminal 11 in the form of indication signaling, or implicitly Notifying the user terminal 11: In the case where reconnection occurs, the PRACH response message is transmitted on the CCD 3 to cause the user terminal 11 to confirm the CCD 3 as its downlink reference component carrier, or implicitly notify the user in the configuration of functions such as NAS information transmission. The terminal 11 confirms the CCD 3 as its downlink reference component carrier. In combination with the uplink transmission signal of the user terminal 11, for example, the PRACH signal or the uplink reference signal, etc., the reception time on the base station 12 side and the determined downlink reference component carrier CCD3 of the base station 12, the base station 12 can specifically calculate the timing advance value TA. Timing advance information.

It should be understood by those skilled in the art that the foregoing predetermined value refers to: When the base station 12 and the user terminal 11 respectively select CCD1 and CCD2 as their downlink reference component carriers, it is sufficient for the data sent by the end user 11 to be outside the cyclic prefix range. The difference between the transmission delays of the downlink component carriers CCD1, CCD2, and the specific values thereof do not constitute a limitation of the present invention.

Next, the base station 12 performs step S302 to send timing advance indication signaling TA_Signing through the downlink component carrier CCD2, and the timing advance indication signaling includes timing advance information determined by the base station 12 in step S301.

On the user terminal 11 side, at the initial stage of system operation, it is learned from the base station 12 that the downlink primary component carrier (DL Primary CC) is configured as: CCD3. Here, the downlink reference component carrier corresponding to the base station 12 is determined as the downlink primary component carrier CCD3, and the user terminal 11 determines the downlink component carrier CCD3 as the downlink reference component carrier of the user terminal.

First, the user terminal 11 performs step S201 and receives through the downlink component carrier CCD2. The timing advance indication signaling TA_Signalling is included, and the timing advance indication signaling TA_Signing includes timing advance information corresponding to the timing advance value TA from the base station 12.

Then, the user terminal 11 performs step S202 to update the timing advance value TA maintained by the uplink component carriers CCU1, CCU2, CCU3 according to the timing advance information, and start/restart the timer timer. If the timer timer does not receive the timing advance indication signaling and is restarted before the timeout, the user terminal 11 performs random access to obtain the timing advance value TA from the base station 12.

Next, the user terminal 11 performs step S203 to determine the uplink transmission time of the user terminal based on the determined downlink reference component carrier CCD3 and the updated timing advance value TA. It is assumed that the time when the user terminal 11 receives the downlink reference signal on the downlink reference component carrier CCD3 is TP1, and the user terminal 11 according to the updated timing advance value TA, according to the configuration of the system effective time for the TA value, will be in the subsequent corresponding uplink. The time for transmitting data on the frame is determined as T _P1 + t-2TA, where t is the effective time of the TA value configured by the system, and the value varies depending on the system configuration. For example, it may be sent between uplink subframe data twice. The length of the interval. The above adjustment of the transmission time point offsets the transmission delay caused by the downlink component carrier CCD3 and the transmission delay of all the activated uplink component carriers with a certain compensation strategy. The user terminal 11 transmits the data of the uplink subframe at the above-mentioned time point T _P1 + t-2TA, for example, transmits DATA1 on the CCU1 and simultaneously transmits DATA2 on the CCU2, since the channel condition of all the activated uplink component carriers of the system is very Proximity, therefore, DATA1 and DATA2 described above can be received by base station 12 in synchronization.

It should be understood by those skilled in the art that, here, twice the timing advance value TA value or other values are used to compensate the uplink transmission time point of TP1+t in advance, which is not enough to limit the present invention, and the user terminal 11 adjusts the uplink by compensation. The purpose of the transmission time point is only to ensure that the uplink data sent by the user terminal 11 in the carrier aggregation scenario in this embodiment arrives at the base station 12 synchronously within the corresponding cyclic prefix range of the subsequent subframe of the system. Therefore, the user terminal here The specific compensation strategy or adjustment strategy for the uplink transmission time point does not constitute a limitation of the present invention. Meanwhile, those skilled in the art should understand that the reference signal can be transmitted on each activated component carrier; and the downlink reference component carrier herein refers to the component carrier in which the base station 12 calculates the reference signal on which the timing advance value TA is based. , or The user terminal 11 is configured to configure the effective time of the TA value, and the component carrier on which the reference signal is based in determining the transmission time of the uplink data of the subsequent subframe.

Those skilled in the art should understand that steps S201, S202, and S203 in FIG. 2 have no strict logical relationship, that is, in a certain system operation scenario, the three may occur sequentially according to the timing as shown in FIG. However, in other operating scenarios, steps S201, S202 may occur sequentially, and step S203 may occur relatively independently at any time when the timer timer has not timed out.

Optionally, in the foregoing embodiment, if the uplink component carrier CCU4 transitions from the inactive state to the active state before the timer timer expires, the uplink component carrier CCU4 and other active uplink component carriers CCU1. CCU2 and CCU3 share a timer timer and a timing advance value TA.

According to the embodiment of the present invention described above, optionally, when the base station 12 changes the downlink primary component carrier CCD3 from the active state to the inactive state, the CCD 2 is changed from the inactive state to the active state as the new downlink primary component carrier. And, the foregoing change process triggers the reconnection process of the user terminal 11, and the user terminal 11 triggers a random access procedure. According to the default configuration of the system: using the downlink primary component carrier as the downlink reference component carrier, the base station 12 is based on the The new downlink reference component carrier, that is, the downlink primary component carrier CCD2, performs step S301, determines the timing advance value information, and transmits the TA signaling including the information to the user terminal 11, and the user terminal 11 obtains the new downlink from the base station 12. The information of the primary component carrier (CCD2), and according to the default configuration of the system, after the following line primary component carrier CCD2 is determined as the new downlink reference component carrier, step S203 is performed, and the new timing advance information from the base station 12 is combined to update the timing advance. The value TA is determined when it sends uplink data through the uplink component carrier. Point. Similarly, the specific calculation method of the timing advance information corresponding to the timing advance value TA by the base station 12 and the specific calculation method of the transmission time point of the uplink data of the subsequent subframes by the user terminal 11 do not constitute a limitation of the present invention.

According to the embodiment of the present invention described above, optionally, when the base station 12 changes the downlink primary component carrier CCD3 from the active state to the inactive state, the CCD 2 is changed from the inactive state to the active state as the new downlink primary component carrier. And, the foregoing change process does not trigger the reconnection process of the user terminal 11, and determines the downlink primary component carrier as the next according to the default configuration of the system. For the reference component carrier, the base station 12 performs step S301 based on the new downlink reference component carrier, that is, the downlink primary component carrier CCD2, and the receiving time of the uplink transmission of the user terminal 11, and determines a new one corresponding to the timing advance value TA. Timing advance information, and transmitting TA indication signaling including the timing advance information to the user terminal 11, the user terminal 11 obtaining information about the new downlink primary component carrier (CCD2) from the base station 12, and according to the default configuration of the system, The downlink primary component carrier CCD2 is determined as its downlink reference component carrier, and step S203 is performed. Based on the determined downlink reference component carrier, the timing advance value TA is updated in conjunction with the new timing advance information from the base station 12, and is determined to be in the subsequent subframe. The time point at which the uplink data is transmitted by the uplink component carrier in the frame. Similarly, the specific calculation method of the timing advance value TA by the base station 12 and the specific calculation method of the transmission time point of the uplink data of the user terminal 11 do not constitute a limitation of the present invention.

According to another embodiment of the present invention, the downlink reference component carrier is not configured by default when the system is started, and the base station 12 is configured to transmit a physical random access response message (PRACH Message 2) or timing advance indication signaling during system operation. The downlink component carrier is determined as its downlink reference component carrier. For example, the base station 12 determines CCD1 as its downlink reference component carrier, and transmits a physical random access response message (PRACH Message 2) or timing advance (TA) on the downlink component carrier CCD1. Instructing signaling to the user terminal 11, correspondingly, after receiving the physical random access response message (PRACH Message 2) or timing advance (TA) indication signaling on the downlink component carrier CCD1, the user terminal 11 will also carry the The downlink component carrier CCD1 of the message or signaling is determined as its downlink reference component carrier. After this process, the base station 12 and the user terminal 11 have each determined their downlink reference component carrier (CCD1). Thereafter, the base station 12 and the user terminal 11 perform the process of step S301 or S203 based on the downlink reference component carrier CCD1. I will not repeat them here.

According to another embodiment of the present invention, the difference between the transmission delays of the downlink component carriers CCD1, CCD2, and CCD3 is small, for example, numerically less than a predetermined value, such as a cyclic prefix CP, and the downlink reference component is not configured by default when the system is started. The carrier, during the operation of the system, the base station 12 can determine any of the three downlink component carriers CCD1, CCD2, and CCD3, for example, CCD1, as the downlink reference component carrier of the base station. Similarly, the user terminal 11 can also use three active downlink component carriers CCD1, CCD2, and CCD3. Any downlink component carrier, such as CCD2, is determined to be the downlink reference component carrier of the user terminal 11. After the downlink reference component carrier of the base station I ² and the user terminal 11 is determined, the base station I ² performs step S301 based on the downlink reference component carrier CCD1, and the user terminal 11 performs the process of step S203 based on the downlink reference component carrier CCD2, and details are not described herein again. .

4 is a block diagram showing the structure of a timing advance device 400 in a user terminal of a wireless network according to an embodiment of the present invention. The timing advancement apparatus 400 includes an indication signaling receiving module 401, a timing advance activation module 402, and an uplink transmission time determining module 403. In addition, a timer 404 is also configured for all activated uplink component carriers, and the timing advance device is further configured. The 400 maintenance has a timing advance value (not shown in the figure), and includes a timeout judging module 405, a random access module 406, and a downlink reference component carrier determining module 407.

The indication signaling receiving module 401 is configured to receive timing advance indication signaling (not shown in the figure) through one of the three activated downlink component carriers CCD1, CCD2, and CCD3, which is not shown in the figure, and the timing advance indication signaling Including the advance information when necessary.

The timing advance start module 402 receives the timing advance information in the timing advance indication signaling obtained by the indication signaling receiving module 401, and is used to update the timing advance value according to the timing advance information, and start in the initial stage of the system, or The timer 404 is restarted while the system is running.

The uplink sending time determining module 403 is configured to determine, according to the determined downlink reference component carrier, an uplink sending time of the user terminal according to the updated timing advance value.

Optionally, the timing advance device 400 further includes a random access module 406, configured to run a random access procedure for the user terminal 11.

The timeout judging module 405 is configured to determine whether the timer 404 times out. If the timer advance indication signaling is not received before the timer 404 times out, the random access module 406 is triggered to perform random access to the slave base station at the timeout time. The timing advance value TA is obtained on the 12 side.

Optionally, when the timer 404 is in an untimed working state, if a new uplink component carrier occurs, for example, the component carrier CCU4 in the inactive state is activated by the base station 12, the component carrier CCU4 may be combined with other activated components. The carrier shares the timer 404 for timing the update timing of the advance value TA. Similarly, the timing advance value TA can also be used. It is shared by the component carrier CCU4.

Alternatively, the timing of the user terminal 11 in advance apparatus 400 further comprises a downlink component carrier reference module ^407, the reference component carrier for downlink user terminal 11.

In an embodiment, if the difference between the transmission delays of the plurality of activated downlink component carriers configured by the system is numerically less than a certain value, such as less than the cyclic prefix CP, any one of the configured plurality of activated downlink component carriers is configured. A downlink component carrier is determined as the downlink reference component carrier of the user terminal 11.

In another embodiment, if the difference between the transmission delays of the plurality of activated downlink component carriers configured by the system is greater than a predetermined value, such as a cyclic prefix CP, the downlink reference component carrier determining module 407 is configured to transmit the physical random access. The downlink component carrier, such as CCD2, of the incoming response message (PRACH message 2) or the timing advance indication signaling (TA Command) is determined as the downlink reference component carrier.

In still another embodiment, in the case where the difference in transmission delays of the plurality of activated downlink component carriers configured by the system is greater than a predetermined value, such as a cyclic prefix CP, optionally, the downlink reference component carrier determining module 407 The downlink primary component carrier, such as CCD3, may also be determined as the downlink reference component carrier. When the base station 12 changes the downlink primary component carrier from CCD3 to CCD2, and the change of the downlink primary component carrier triggers the reconnection of the user terminal 11, the random access module 406 in the user terminal 11 obtains the base station 12 by random access. The newly determined downlink primary component carrier CCD2 and the newly determined timing advance value TA, then the downlink reference component carrier determining module 407 determines the newly determined downlink primary component carrier CCD2 as the downlink reference component carrier.

Figure 5 is a block diagram showing the structure of a timing advance device in a base station 12 of a wireless network, in accordance with an embodiment of the present invention. The timing advance device 500 includes a timing advance value determining module 501, an instruction signaling module 502, and a downlink reference component carrier determining module 503.

The timing advance value determining module 501 is configured to determine timing advance information of the user terminal 11 based on the determined downlink reference component carrier of the base station;

The indication signaling module 502 is configured to send timing advance indication signaling by using one of the activated downlink component carriers: CCD1, CCD2, and CCD3, for example, CCD2; the timing advance indication signaling includes the timing advance value determining module 501. Timing advance information. The downlink reference component carrier determining module 503 is configured to determine a downlink reference component carrier of the base station 12.

In one embodiment, if the difference in transmission delays of the configured plurality of activated downlink component carriers is numerically less than a predetermined value, such as a cyclic prefix CP, the downlink reference component carrier determining module 503 can set the plurality of activated downlink components. Any downlink component carrier in the carrier, such as CCD1, is determined to be the downlink reference component carrier of the base station.

In another embodiment, if the difference of the transmission delays of the configured plurality of activated downlink component carriers is greater than a predetermined value, such as a cyclic prefix CP, the downlink reference component carrier determining module 503 may use the original downlink master of the system. A component carrier, such as CCD3, is determined as a downlink reference component carrier. Optionally, when the base station 12 changes the downlink primary component carrier from CCD3 to CCD2, the downlink reference component carrier determining module 503 determines the changed downlink primary component carrier CCD2 as a new downlink reference component carrier.

In still another embodiment, if the difference in transmission delays of the configured plurality of activated downlink component carriers is greater than a predetermined value, such as a cyclic prefix, the downlink reference component carrier determining module 503 uses the base station 12 to transmit the physical The downlink component carrier of the random access response message (PRACH message 2) or the timing advance indication signaling (TA Command) is determined as the downlink reference component carrier. Optionally, when the downlink component carrier used by the base station 12 to transmit the PRACH message 2 or the TA Command is changed, for example, by CCD1 to CCD2, the downlink reference component carrier determining module 503 determines the CCD2 as a new one. Downlink reference component carrier.

It should be noted that the above embodiments are merely exemplary and not limiting of the invention. Any technical solution that does not depart from the spirit of the present invention should fall within the scope of the present invention, including the use of different technical features that appear in different embodiments, and the scheduling method can be combined to achieve a beneficial effect. In addition, any reference signs in the claims should not be construed as limiting the claims. The word "comprising" does not exclude the means or steps that are not listed in the other claims or the description; Excluding the existence of a plurality of such devices; in a device comprising a plurality of devices, the functionality of one or more of the plurality of devices may be implemented by the same hardware or software module; "first,", "second, Words such as "third" are used only to denote names, and do not denote any particular order.

Claims

Claim

A method for timing advance in a user terminal of a wireless network, where at least one downlink component carrier and at least one uplink component carrier are configured in the wireless network, and the at least one downlink component carrier includes a downlink principal component The carrier, the at least one active uplink component carrier of the at least one uplink component carrier shares a timer and a timing advance value, and the method includes the following steps:

Receiving, by one of the downlink component carriers activated by the at least one of the at least one downlink component carrier, the timing advance indication signaling, where the timing advance indication signaling includes a timing advance information;

B. updating the timing advance value according to the timing advance information, and starting/restarting the timer, and

The uplink transmission time of the user terminal is determined based on the determined downlink reference component carrier and the updated timing advance value.

2. The method according to claim 1, further comprising the steps of:

C. If the timing advance indication signaling is not received before the timer expires, random access is performed to obtain the timing advance value.

3. The method according to claim 1 or 2, further comprising the steps of:

D. If the timer has not timed out, the new uplink component carrier shares the timer for the update timing of the timing advance value.

4. The method of any of claims 1-3, further comprising the step of:

E1. determining, if the difference between the downlink component carrier transmission delays of the at least one of the at least one downlink component carriers is less than a predetermined value, determining any one of the at least one activated downlink component carriers as the user The downlink reference component carrier of the terminal.

5. The method according to claim 4, further comprising the steps of:

E2. If the difference of transmission delays of the at least one active downlink component carrier of the at least one downlink component carrier is greater than a predetermined value, determining the downlink primary component carrier as the downlink reference component carrier.

6. The method according to claim 4, further comprising the step of: transmitting a physical if a difference in transmission delays of at least one of the at least one downlink component carrier is greater than a predetermined value The downlink component carrier of the random access response message or the timing advance indication signaling is determined as the downlink reference component carrier.

The method according to claim 5, wherein the step E2 further comprises: when the change of the downlink primary component carrier triggers reconnection, obtaining a downlink primary component carrier newly determined by the base station by using random access and new Determining the timing advance value and determining the newly determined downlink primary component carrier as the downlink reference component carrier.

8. A method for timing advance in a base station of a wireless network, wherein at least one downlink component carrier and at least one uplink component carrier are configured in the wireless network, and the at least one downlink component carrier includes a downlink primary component The carrier, the at least one active uplink component carrier of the at least one uplink component carrier shares a timer and a timing advance value, and the method includes the following steps:

a determining, based on the determined downlink reference component carrier, timing advance information, the timing advance information corresponding to the timing advance value;

And transmitting, by one of the downlink component carriers activated by the at least one downlink component carrier, timing advance indication signaling, where the timing advance indication signaling includes the timing advance information.

9. The method according to claim 8, further comprising the steps of:

And determining, if the difference of the transmission delays of the at least one active downlink component carrier of the at least one downlink component carrier is less than a predetermined value, determining any one of the at least one activated downlink component carrier as the base station Downlink reference component carrier.

10. The method according to claim 9, further comprising the steps of:

And determining, if the difference of transmission delays of the at least one active downlink component carrier of the at least one downlink component carrier is greater than a predetermined value, determining the downlink primary component carrier as the downlink reference component carrier.

11. The method according to claim 9, further comprising the steps of: And if the difference between the transmission delays of the at least one active downlink component carrier of the at least one downlink component carrier is greater than a predetermined value, the downlink component carrier used by the base station to transmit the physical random access response message or the timing advance indication signaling Determined as the downlink reference component carrier.

12. The method according to claim 10, further comprising the steps of:

When the downlink primary component carrier is changed, the changed downlink primary component carrier is determined as the downlink reference component carrier.

13. The method according to claim 11, further comprising the steps of:

Determining, after the changed downlink component carrier used to transmit the physical random access response message or the timing advance indication signaling, the changed downlink component carrier used to transmit the physical random access response message or the timing advance indication signaling The downlink reference component carrier.

14. A device for timing advance in a user terminal of a wireless network, wherein at least one downlink component carrier and at least one uplink component carrier are configured in the wireless network, and at least one of the at least one uplink component carrier is activated The uplink component carriers share a timer and a certain time advance value, and the device includes:

And an indication signaling receiving module, configured to receive timing advance indication signaling by using one of the downlink component carriers activated by the at least one of the at least one downlink component carrier, where the timing advance indication signaling includes timing advance information;

a timing advance start module, configured to update the timing advance value according to the timing advance indication signaling, and start/restart the timer;

15. A device for timing advance in a base station of a wireless network, wherein at least one downlink component carrier and at least one uplink component carrier are configured in the wireless network, and at least one of the at least one uplink component carrier is activated The uplink component carrier shares a timer and a certain time advance value, and the device includes:

a timing advance value determining module, based on the determined downlink reference component carrier, determining a certain time advance information; And an indication signaling sending module, configured to send timing advance indication signaling by one of the downlink component carriers activated by at least one of the at least one downlink component carrier; the timing advance indication signaling includes the timing advance information.