CN101741710B - Uplink-downlink configuration and receiving methods of TDD system carrier aggregation - Google Patents
Uplink-downlink configuration and receiving methods of TDD system carrier aggregation Download PDFInfo
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Abstract
The invention provides an uplink-downlink configuration method of a TDD system carrier aggregation, comprising the following steps of: independently carrying out uplink-downlink configuration on all member carriers that participate in the aggregation in a cell, and ensuring that at least one same uplink subframe and at least one same downlink subframe exist between at least two member carriers and the configuration of at least one member carrier accords with the uplink-downlink configuration of an R8; and issuing the uplink-downlink configuration of any member carrier and the uplink-downlink configuration of other member carriers of any member carrier aggregation into an LTE-A user terminal UE. The invention also provides an uplink-downlink configuration receiving method of the TDD system carrier aggregation. The invention can realize the uplink-downlink configuration in the LTE-A system so as to be suitable for TDD system requirements.
Description
Technical Field
The present invention relates to carrier aggregation technologies, and in particular, to an uplink and downlink configuration and receiving method for carrier aggregation in a Time Division Duplex (TDD) system.
Background
An LTE-Advanced (LTE-a) system can support a wider system bandwidth, such as 100MHz, than a Long Term Evolution (LTE) system. Specifically, resources of a plurality of LTE carriers (also called component carriers) can be used in a connected manner to provide a wider system bandwidth for LTE-a UEs, where the LTE-a UEs are terminal devices of an LTE evolved system, can operate in the LTE-a system, and can support new functions provided by the LTE-a system. Specifically, the LTE-a system has two ways of connecting multiple LTE carrier resources, one is to aggregate multiple continuous LTE carriers, and the other is to aggregate multiple discontinuous LTE carriers, which can both provide a larger transmission bandwidth for LTE-a. Fig. 1 gives an example of discontinuous carrier aggregation.
The current research trend of the standardization organization is that, a common consensus of carrier aggregation system design is that the design on a carrier is kept consistent with LTE Release8 (R8) as much as possible, so that a larger transmission bandwidth can be provided for an LTE-a terminal, and the terminal of LTE R8 (LTE UE for short) can be guaranteed to normally operate on each component carrier, thereby achieving downward compatibility.
For the LTE Release8 TDD mode, the requirement of uplink and downlink asymmetric traffic is met by different uplink and downlink configurations, and uplink and downlink subframes are allocated with a plurality of configurations shown in table 1. In the TDD system, a base station needs to broadcast current uplink and downlink subframe allocation information of a cell to the cell, and a TDD terminal can perform normal data transmission and reception after obtaining the information.
However, in the current LTE-a system design, the uplink and downlink configuration problem on different carriers in the TDD mode is not considered, and there is no relevant solution, and it cannot be guaranteed that the terminal of R8 normally operates on each member carrier.
TABLE 1 different uplink and downlink configuration modes of LTE-TDD system
Disclosure of Invention
In view of this, the present invention provides an uplink and downlink configuration and receiving method for TDD system carrier aggregation, which can implement uplink and downlink configuration in an LTE-a system to meet the requirement of the TDD system.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for configuring uplink and downlink of carrier aggregation of a TDD system comprises the following steps:
independently performing uplink and downlink configuration on each member carrier participating in aggregation in a cell, and ensuring that at least one same uplink subframe and at least one same downlink subframe exist between at least two member carriers, wherein the configuration of at least one member carrier accords with the uplink and downlink configuration of R8;
and sending the uplink and downlink configuration of any member carrier and the uplink and downlink configuration of other member carriers aggregated with the member carrier to the LTE-A user terminal UE accessed to the corresponding member carrier.
Preferably, when the uplink and downlink configuration is performed, it is ensured that the uplink and downlink configuration of each component carrier and the uplink and downlink configuration of its adjacent frequency meet the coexistence requirement.
Preferably, the uplink and downlink configuration for each component carrier participating in aggregation in the cell is as follows:
and carrying out the same uplink and downlink configuration on each aggregated member carrier, and carrying out different uplink and downlink configurations on each aggregated member carrier.
Preferably, the uplink and downlink configuration for each component carrier participating in aggregation in the cell is as follows: and judging whether the carrier aggregation mode in the cell is continuous aggregation or discontinuous aggregation, if so, performing the same uplink and downlink configuration on all the member carriers, and if not, respectively performing the uplink and downlink configuration on each member carrier.
Preferably, the uplink and downlink configurations of all component carriers conform to the uplink and downlink configuration of R8.
Preferably, the issuing the uplink and downlink configuration of any one component carrier and the uplink and downlink configuration of other component carriers aggregated with any one component carrier to the LTE-a UE accessing the corresponding carrier includes:
sending the uplink and downlink configuration of any member carrier and the uplink and downlink configuration of other member carriers aggregated with any member carrier through a broadcast message; or,
and issuing the uplink and downlink configuration of any member carrier and the uplink and downlink configuration of other member carriers aggregated with any member carrier through a high-level signaling of any member carrier.
Preferably, the manner of issuing the uplink and downlink configuration of the other component carriers aggregated with any one component carrier is as follows:
issuing uplink and downlink configurations of other member carriers aggregated with any one member carrier one by one;
or, issuing information whether the uplink and downlink configuration of the other component carriers is the same as the uplink and downlink configuration of any one component carrier, and the uplink and downlink configuration of the other component carriers different from the uplink and downlink configuration of any one component carrier;
or, the uplink and downlink configuration of the other member carriers different from the uplink and downlink configuration of any member carrier is issued.
Preferably, after the uplink and downlink configuration of each component carrier is performed, the method further includes: and sending the uplink and downlink configuration of any member carrier to the LTE UE accessing the corresponding member carrier.
Preferably, the uplink and downlink configurations of any one component carrier and the other component carriers are issued by using different physical resources or logical resources.
Preferably, when the LTE-a UE needs to receive or transmit data on multiple carriers simultaneously, the LTE-a UE is scheduled on subframes which are both downlink or uplink on multiple aggregated component carriers.
A TDD system carrier aggregation uplink and downlink configuration receiving method is characterized in that LTE-A User Equipment (UE) receives uplink and downlink configuration of an LTE-A UE access carrier and uplink and downlink configuration of other member carriers aggregated with the access carrier, wherein the uplink and downlink configuration of the LTE-A UE access carrier and the uplink and downlink configuration of other member carriers aggregated with the access carrier are issued by a base station on the access carrier of the LTE-A UE.
Preferably, the method further comprises: and the LTE UE receives the uplink and downlink configuration of the LTE UE access carrier transmitted by the base station on the access carrier.
Preferably, physical resources or logical resources for carrying uplink and downlink configuration information of the carrier and uplink and downlink configuration information of other carriers aggregated with the carrier are respectively set on each member carrier in advance;
the LTE-A UE extracts uplink and downlink configuration of the access carrier on the physical resource or the logic resource which is preset on the access carrier and used for bearing the uplink and downlink configuration information of the access carrier, and extracts uplink and downlink configuration of other member carriers aggregated with the access carrier on the physical resource or the logic resource which is preset on the access carrier and used for bearing the uplink and downlink configuration information of other member carriers aggregated with the access carrier;
and the LTE UE extracts the uplink and downlink configuration of the access carrier on the physical resource or the logic resource which is preset on the access carrier and used for bearing the uplink and downlink configuration information of the access carrier.
According to the technical scheme, uplink and downlink configuration is independently performed on each member carrier participating in aggregation in a cell, and at least one same uplink subframe and at least one same downlink subframe exist between at least two member carriers, so that the LTE-A system can be ensured to provide larger system bandwidth, and meanwhile, the configuration of at least one member carrier conforms to the uplink and downlink configuration of R8, so that downward compatibility of R8 is ensured. After the configuration is carried out according to the method, the uplink and downlink configuration of any member carrier and the uplink and downlink configuration of other member carriers aggregated with any member carrier are issued to the LTE-A UE, so that the LTE-A UE can acquire the uplink and downlink configuration to correctly complete the transmission and the reception of data.
Drawings
Fig. 1 is a schematic diagram of discontinuous carrier aggregation in an LTE-a system.
Fig. 2 is a general flowchart of an uplink and downlink configuration method for carrier aggregation in a TDD system according to the present invention.
Fig. 3 is a schematic diagram 1 of an adjacent channel coexistence condition in uplink and downlink carrier configuration.
Fig. 4 is a schematic diagram 2 of an adjacent channel coexistence condition in uplink and downlink carrier configuration.
Fig. 5 is a schematic diagram of carrier allocation when LTE-a UE needs a larger downlink bandwidth.
Fig. 6 is a schematic diagram of carrier allocation when LTE-a UE needs a larger uplink bandwidth.
Detailed Description
For the purpose of making the objects, technical means and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
Fig. 2 is a general flowchart of an uplink and downlink configuration method for carrier aggregation in a TDD system according to the present invention. As shown in fig. 2, the method includes:
The invention provides that for an LTE-A TDD system, uplink and downlink configuration on each component carrier can be configured independently, namely the following conditions can occur: the uplink and downlink configurations on each component carrier are completely the same, or the uplink and downlink configurations on each component carrier are different.
Preferably, because there may be other adjacent-frequency TDD systems on the component carrier, in order to meet the requirement between adjacent-frequency carriers and ensure normal operation of each system, it is required that, in the process of configuring uplink and downlink of the component carrier, the uplink and downlink configuration of each component carrier and the uplink and downlink configuration of its adjacent frequency meet the coexistence requirement, that is, there is a certain limit to the uplink and downlink allocation of the carrier. The specific coexistence requirements and restrictions on the uplink and downlink configurations are the same as the existing requirements. Such as depicted in fig. 3 and 4.
As shown in fig. 3, since an operator deploys a TD-CDMA network (for example, uplink and downlink configurations are 7:8) on frequency point f1, and deploys an LTE-TDD system 1 on frequency point f2 adjacent to f1, the uplink and downlink configurations of the LTE-TDD system 1 need to be configured according to configuration 6 in table 1 to avoid interference between adjacent frequency systems due to the requirement of adjacent frequency coexistence;
as shown in fig. 4, since TD-SCDMA is deployed on frequency point f3 (for example, uplink and downlink configurations are 4: 3), and LTE-TDD system 2 is deployed on frequency point f4 adjacent to f3, the uplink and downlink configurations of LTE-TDD system 2 need to be configured according to configuration 1 in table 1 to avoid interference between adjacent frequency systems due to the requirement of adjacent frequency coexistence.
Meanwhile, in order to ensure that the LTE-a system can provide a higher system bandwidth for the LTE-a UE, it is required that multiple carriers can be simultaneously allocated to the same LTE-a UE, and the multiple carriers need to have the same uplink or downlink subframe, so that when performing uplink and downlink timeslot configuration, at least one same uplink subframe and at least one same downlink subframe need to exist between at least two component carriers, so as to provide an adequate bandwidth for the LTE-a UE to perform data transmission.
Further, in order to ensure that the component carriers are compatible with R8 downward, the configuration of at least one component carrier is required to conform to the uplink and downlink configuration of R8.
The above conditions are conditions that need to be satisfied when the component carrier performs uplink and downlink configuration. Specifically, in the process of configuring uplink and downlink of the component carrier, the following steps may be preferably performed:
and judging whether the carrier aggregation mode in the cell is continuous aggregation or discontinuous aggregation, if so, performing the same uplink and downlink configuration on all the member carriers, and if not, respectively performing the uplink and downlink configuration on each member carrier.
Specifically, when multiple component carriers are continuously aggregated, since adjacent frequencies of each carrier cause mutual interference between uplink and downlink of adjacent frequency bands due to different uplink and downlink allocations, it is preferable to configure the uplink and downlink configurations of each carrier to be the same. Of course, different uplink and downlink configurations are possible, and in this case, the interference problem of adjacent channels needs to be considered.
When a plurality of component carriers are non-continuously aggregated, because the component carriers are not adjacent to each other on the frequency spectrum, the component carriers can be configured into different uplink and downlink configurations without the interference problem. However, the uplink and downlink configuration between each component carrier and its adjacent frequency carrier still needs to meet the coexistence requirement.
Each configured component carrier may be configured such that all component carriers conform to the uplink and downlink configuration of R8, or some of the component carriers conform to the uplink and downlink configuration of R8, and specifically, the selected uplink and downlink configuration of each carrier may be arbitrarily selected and combined as long as the above-mentioned restriction conditions such as the requirement for coexistence between adjacent frequencies are satisfied.
In this step, the specific manner of issuing the uplink and downlink configuration may be: the UEs accessing the respective carriers are notified by a broadcast message on each carrier or higher layer signaling of the carrier.
For example, the uplink and downlink configurations of each other member carrier aggregated with a certain carrier a are sequentially issued, or an incremental issuing manner is adopted, that is, the UE is first notified whether the uplink and downlink configurations of the other member carriers are the same as the uplink and downlink configurations of the carrier a, and then the uplink and downlink configurations of the member carriers different from the uplink and downlink configurations of the carrier a are sequentially issued, or the uplink and downlink configurations of the other member carriers are issued directly when the uplink and downlink configurations of the other member carriers are different from the uplink and downlink configuration of the carrier a, otherwise, the uplink and downlink configurations of the other member carriers are considered to be the same as the uplink and downlink configuration of the carrier a.
Preferably, to ensure downward compatibility with R8, the uplink and downlink configuration of each component carrier may also be issued to the LTE UE accessing the corresponding carrier, so that the LTE UE may send and receive data in the LTE-a system. At this time, the uplink and downlink configurations of the component carrier a and other component carriers may be issued on any carrier a by using different physical resources or logical resources, for example, using different broadcast channels or being encapsulated in different data packets, so that the LTE UE only receives the uplink and downlink configurations of the carrier, and the LTE-a UE can receive the uplink and downlink configurations of the carrier and other component carriers.
The basic uplink and downlink configuration method of the present invention is completed.
Corresponding to the uplink and downlink configuration method, the invention also provides a method for receiving the uplink and downlink configuration. In the receiving method, the LTE-a UE receives the uplink and downlink configuration, specifically, the uplink and downlink configuration of each carrier issued by the base station and the uplink and downlink configuration of other carriers aggregated with the carrier are received, so that in the subsequent data transmission process, the aggregation of multiple carriers can be used for data transmission, thereby improving the system data transmission bandwidth. Meanwhile, when the uplink and downlink configuration is performed, the uplink and downlink configuration of each carrier can be issued to the LTE UE accessing the carrier through the corresponding carrier, so that the LTE UE can also receive the uplink and downlink configuration of the carrier accessed by the LTE UE issued by the base station. In particular, the method comprises the following steps of,
for the UE accessing each LTE TDD carrier, the uplink and downlink configuration of the carrier needs to be known, specifically, the uplink and downlink configuration is known through a broadcast message sent on the carrier;
for LTE-a UE accessing each LTE-TDD carrier, it needs to know uplink and downlink configurations on other carriers providing a larger transmission bandwidth with the carrier aggregation, and the specific learning manner may be:
A) the information is obtained through the broadcast message on the carrier, that is, each carrier broadcasts the uplink and downlink configuration information of the carrier, and also broadcasts the uplink and downlink configuration information of other aggregated carriers. The broadcast message can also be sent in an incremental manner, namely, whether the uplink and downlink configuration on each carrier is the same as the carrier is respectively informed, and then only the uplink and downlink configuration information on the member carrier different from the carrier configuration is broadcast.
B) The notification, for example, when the RRC connection is established is known through the higher layer signaling on the carrier. Similarly, the high-level signaling may also be notified in an incremental manner, that is, only when the uplink and downlink configuration of the other carrier is different from that of the carrier, the specific uplink and downlink configuration information is notified, otherwise, only the corresponding carrier is indicated to be the same as the uplink and downlink configuration of the carrier.
By the method, uplink and downlink configuration and reception in the LTE-A system are realized, so that conditions are created for providing larger system bandwidth for the UE. After the above configuration is performed, preferably, due to a requirement of a larger bandwidth, when a certain LTE-a UE needs to receive or transmit data on multiple carriers simultaneously, the LTE-a UE may be scheduled on a subframe that is uplink or downlink on multiple aggregated component carriers.
For example, if a certain LTE-a UE needs a larger downlink bandwidth (needs to receive data on multiple carriers simultaneously), the base station may select a part of the carriers from the aggregated multiple carriers and schedule the LTE-AUE on the subframes that are downlink on the carriers at the same time, as shown in fig. 5.
A similar approach is used for upstream support of larger bandwidth, as shown in fig. 6.
In addition, in the process of implementing the present invention, it is also necessary to ensure that the LTE-TDD systems on different carriers maintain accurate synchronization, specifically including radio frame alignment and subframe alignment.
As can be seen from the above specific implementation of the present invention, the present invention solves the problem of uplink and downlink configuration on different component carriers of the LTE-a TDD system, and when performing uplink and downlink configuration, the component carriers may be configured to conform to the uplink and downlink configuration of R8 as needed, so as to implement downward compatibility with R8, or other suitable uplink and downlink configurations may also be employed, so as to implement better transmission performance.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (13)
1. A method for configuring uplink and downlink of carrier aggregation of a TDD system is characterized by comprising the following steps:
independently performing uplink and downlink configuration on each member carrier participating in aggregation in a cell, and ensuring that at least one same uplink subframe and at least one same downlink subframe exist between at least two member carriers, wherein the configuration of at least one member carrier accords with the uplink and downlink configuration of LTE Release 8;
and sending the uplink and downlink configuration of any member carrier and the uplink and downlink configuration of other member carriers aggregated with the member carrier to the LTE-A user terminal UE accessed to the corresponding member carrier.
2. The method according to claim 1, wherein the uplink and downlink configuration of each component carrier and the uplink and downlink configuration of its adjacent frequency are guaranteed to meet coexistence requirements when performing the uplink and downlink configuration.
3. The method according to claim 1, wherein the uplink and downlink configuration for each component carrier participating in aggregation in a cell is as follows:
and performing the same uplink and downlink configuration for each aggregated member carrier, or performing different uplink and downlink configurations for each aggregated member carrier.
4. The method according to claim 1, wherein the uplink and downlink configuration for each component carrier participating in aggregation in a cell is as follows: and judging whether the carrier aggregation mode in the cell is continuous aggregation or discontinuous aggregation, if so, performing the same uplink and downlink configuration on all the member carriers, and if not, respectively performing the uplink and downlink configuration on each member carrier.
5. The method according to any of claims 1 to 4, wherein the uplink and downlink configurations of all component carriers conform to the uplink and downlink configuration of LTE Release 8.
6. The method of claim 1, wherein the sending the uplink and downlink configuration of any one component carrier and the uplink and downlink configuration of other component carriers aggregated with the any one component carrier to the LTE-a UE accessing the corresponding carrier comprises:
sending the uplink and downlink configuration of any member carrier and the uplink and downlink configuration of other member carriers aggregated with any member carrier through a broadcast message; or,
and issuing the uplink and downlink configuration of any member carrier and the uplink and downlink configuration of other member carriers aggregated with any member carrier through a high-level signaling of any member carrier.
7. The method of claim 6, wherein the manner of issuing the uplink and downlink configuration of the other component carriers aggregated with the any component carrier is as follows:
issuing uplink and downlink configurations of other member carriers aggregated with any one member carrier one by one;
or, issuing information whether the uplink and downlink configuration of the other component carriers is the same as the uplink and downlink configuration of any one component carrier, and the uplink and downlink configuration of the other component carriers different from the uplink and downlink configuration of any one component carrier;
or, the uplink and downlink configuration of the other member carriers different from the uplink and downlink configuration of any member carrier is issued.
8. The method according to claim 1, 6 or 7, wherein after the uplink and downlink configuration of each component carrier is performed, the method further comprises: and sending the uplink and downlink configuration of any member carrier to the LTE UE accessing the corresponding member carrier.
9. The method of claim 8, wherein the uplink and downlink configurations of the any component carrier and the other component carriers are issued by using different physical resources or logical resources.
10. The method of claim 1, wherein when an LTE-A UE needs to receive or transmit data on multiple carriers simultaneously, the LTE-A UE is scheduled on subframes that are both downlink or uplink on the aggregated multiple component carriers.
11. A method for receiving uplink and downlink configuration of TDD system carrier aggregation is characterized in that the method comprises the following steps: the method comprises the steps that LTE-A User Equipment (UE) receives uplink and downlink configuration of an LTE-A UE access carrier and uplink and downlink configuration of other member carriers aggregated with the access carrier, wherein the uplink and downlink configuration of the LTE-A UE access carrier and the uplink and downlink configuration of other member carriers are issued by a base station on the access carrier; the uplink and downlink configuration is independently performed for each member carrier participating in aggregation in a cell, at least one same uplink subframe and at least one same downlink subframe are ensured to exist between at least two member carriers, and the configuration of at least one member carrier conforms to the uplink and downlink configuration of LTE Release 8.
12. The receiving method of claim 11, characterized in that the method further comprises: and the LTE UE receives the uplink and downlink configuration of the LTE UE access carrier transmitted by the base station on the access carrier.
13. The receiving method according to claim 12, wherein physical resources or logical resources for carrying uplink and downlink configuration information of the present carrier and uplink and downlink configuration information of other carriers aggregated with the present carrier are respectively set on each member carrier in advance;
the LTE-A UE extracts uplink and downlink configuration of the access carrier on the physical resource or the logic resource which is preset on the access carrier and used for bearing the uplink and downlink configuration information of the access carrier, and extracts uplink and downlink configuration of other member carriers aggregated with the access carrier on the physical resource or the logic resource which is preset on the access carrier and used for bearing the uplink and downlink configuration information of other member carriers aggregated with the access carrier;
and the LTE UE extracts the uplink and downlink configuration of the access carrier on the physical resource or the logic resource which is preset on the access carrier and used for bearing the uplink and downlink configuration information of the access carrier.
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102260370A CN101741710B (en) | 2008-11-04 | 2008-11-04 | Uplink-downlink configuration and receiving methods of TDD system carrier aggregation |
| US13/127,539 US9137003B2 (en) | 2008-11-04 | 2009-11-04 | Method and device for enabling multi-carriers aggregation transmission |
| EP15202540.9A EP3032860B1 (en) | 2008-11-04 | 2009-11-04 | Method and device for enabling multi-carriers aggregation transmission |
| EP09824407.2A EP2355567B1 (en) | 2008-11-04 | 2009-11-04 | Method and device for enabling multi-carriers aggregation transmission |
| ES09824407.2T ES2587056T3 (en) | 2008-11-04 | 2009-11-04 | Transmission method and device with multi-carrier aggregation |
| PCT/CN2009/074783 WO2010051752A1 (en) | 2008-11-04 | 2009-11-04 | Method and device for enabling multi-carriers aggregation transmission |
| KR1020117012941A KR101239865B1 (en) | 2008-11-04 | 2009-11-04 | Method and device for enabling multi-carriers aggregation transmission |
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| CN2008102260370A CN101741710B (en) | 2008-11-04 | 2008-11-04 | Uplink-downlink configuration and receiving methods of TDD system carrier aggregation |
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| CN101741710B true CN101741710B (en) | 2011-12-07 |
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