WO2016015661A1 - Asymmetric uplink carrier aggregation method and device - Google Patents

Abstract

Embodiments of the present invention provide an asymmetric uplink carrier aggregation method and device. The method comprises: A base station decomposes N downlink carriers and M uplink carriers into multiple carrier aggregation clusters, each carrier aggregation cluster comprising one downlink carrier and K uplink carriers, N being smaller than or equal to M, K being an integer greater than or equal to 1, a downlink carrier and an uplink carrier corresponding to the downlink carrier forming a primary carrier, and the rest K-1 uplink carriers being secondary carriers. The base station performs carrier aggregation on the multiple carrier aggregation clusters. The asymmetric uplink carrier aggregation method and device in the embodiments of the present invention enable carrier aggregation where there are fewer downlink carriers than uplink carriers, thereby satisfying the environment in which the uplink service demand is greater than the downlink service demand.

Description

Asymmetric uplink carrier aggregation method and device Technical field

The embodiments of the present invention relate to the field of communications technologies, and in particular, to an asymmetric uplink carrier aggregation method and apparatus.

Background technique

In the existing Long Term Evolution (LTE) system, a single carrier supports a system bandwidth of up to 20 M. If more bandwidth is required, carrier aggregation technology is required. In the 3rd Generation Partnership Project (3GPP) protocol, aggregation of up to 5 carriers is supported, and the number of downlink carriers is required to be greater than or equal to the number of uplink carriers. In the public network operator network, the general downlink service requirement is greater than the uplink service requirement, and the downlink carrier aggregation defined by the 3GPP can better satisfy the carrier network.

However, in some industry network applications, for example, there are a large number of applications such as video surveillance services, and the uplink service requirements of such services are greater than the downlink service requirements. In this case, the above-mentioned carrier aggregation scheme defined by 3GPP cannot satisfy the industry network. demand.

Summary of the invention

The embodiment of the invention provides an asymmetric uplink carrier aggregation method and device to meet the scenario that the uplink service requirement is greater than the downlink service requirement.

In a first aspect, an embodiment of the present invention provides an asymmetric uplink carrier aggregation method, including:

The base station decomposes the N downlink carriers and the M uplink carriers into multiple carrier aggregation clusters, where each carrier aggregation cluster includes one downlink carrier and K uplink carriers, where N is less than or equal to M, and K is an integer greater than or equal to 1, and downlink One uplink carrier corresponding to the carrier and the downlink carrier form a primary carrier, and the remaining K-1 uplink carriers are secondary carriers;

The base station performs carrier aggregation on the multiple carrier aggregation clusters.

Further, the K uplink carriers included in each carrier aggregation cluster are at least the following A carrier:

Continuous carriers in the same frequency band;

Non-contiguous carriers in the same frequency band;

Carriers in different frequency bands.

Further, before the base station decomposes the N downlink carriers and the M uplink carriers into multiple carrier aggregation clusters, the method further includes:

The base station selects a downlink carrier and an uplink carrier as primary carriers from the licensed frequency band, and the base station selects an uplink carrier as a secondary carrier from the white frequency spectrum.

Further, the base station selects an uplink carrier as a secondary carrier from the white spectrum, including:

The base station performs interference measurement on each narrowband frequency point in the preset white space frequency band to obtain interference measurement values of each narrowband frequency point;

The base station selects, according to the obtained interference measurement value, a white space frequency band with the smallest interference measurement value as an uplink carrier of the secondary carrier, or

The base station selects a frequency band as the uplink carrier of the secondary carrier according to the obtained interference measurement value, blocking characteristic, and interference feature.

Further, the base station performs interference measurement on each narrowband frequency point in the preset white space frequency band, including:

Performing, by the base station, periodic interference measurement on each narrowband frequency point in the preset white space frequency band according to the measurement period, the measurement length, and the measurement start time predefined by the base station;

The base station does not schedule the terminal user within the measurement time period determined by the measurement length and the measurement start time, or

The end user stops transmitting data during the measurement period determined by the measurement length and the measurement start time.

In a second aspect, an embodiment of the present invention provides a base station, including:

The decomposition module is configured to decompose the N downlink carriers and the M uplink carriers into multiple carrier aggregation clusters, where each carrier aggregation cluster includes one downlink carrier and K uplink carriers, where N is less than or equal to M, and K is greater than or equal to 1 The integer carrier, the uplink carrier corresponding to the downlink carrier and the downlink carrier form a primary carrier, and the remaining K-1 uplink carriers are secondary carriers;

And a processing module, configured to perform carrier aggregation on the multiple carrier aggregation clusters.

Further, the K uplink carriers included in each carrier aggregation cluster are at least one of the following carriers:

Continuous carriers in the same frequency band;

Non-contiguous carriers in the same frequency band;

Carriers in different frequency bands.

Further, it also includes:

And a selecting module, configured to: before the decomposing module decomposes the N downlink carriers and the M uplink carriers into multiple carrier aggregation clusters, select a downlink carrier and an uplink carrier as the primary carrier from the licensed frequency band, and select from the white frequency spectrum The upstream carrier of the secondary carrier.

Further, the selecting module includes:

The interference measurement unit is configured to perform interference measurement on each narrowband frequency point in the preset white space frequency band to obtain interference measurement values of each narrowband frequency point;

a selecting unit, configured to select, according to the obtained interference measurement value, a white space frequency band with the smallest interference measurement value as an uplink carrier of the secondary carrier, or

Selecting a frequency band as the uplink carrier of the secondary carrier according to the obtained interference measurement value, blocking characteristic, and interference characteristic.

Further, the interference measurement unit performs interference measurement on each narrowband frequency point in the preset white space frequency band, including:

Performing periodic interference measurement on each narrowband frequency point in the preset white space frequency band according to the measurement period, the measurement length, and the measurement start time predefined by the base station;

The base station does not schedule the terminal user within the measurement time period determined by the measurement length and the measurement start time, or

The end user stops transmitting data during the measurement period determined by the measurement length and the measurement start time.

The asymmetric uplink carrier aggregation method and device provided by the embodiment of the present invention, the base station and the uplink carrier are decomposed into multiple carrier aggregation clusters, and each carrier aggregation cluster includes one downlink carrier and K uplink carriers, and then multiple The carrier aggregation cluster performs carrier aggregation. Therefore, the carrier aggregation of the downlink carrier is smaller than that of the uplink carrier, and the scenario that the uplink service requirement is greater than the downlink service requirement can be met.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description of the drawings used in the embodiments or the prior art description will be briefly described below. Obviously, the drawings in the following description It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any inventive labor.

1 is a flowchart of Embodiment 1 of an asymmetric uplink carrier aggregation method according to the present invention;

2 is a schematic diagram of N downlink carriers and M uplink carriers;

3 is a schematic diagram of carrier aggregation decomposition;

4 is a schematic diagram of a primary carrier and a secondary carrier;

FIG. 5 is a flowchart of Embodiment 2 of an asymmetric uplink carrier aggregation method according to the present invention;

6 is a schematic structural diagram of Embodiment 1 of a base station according to the present invention;

FIG. 7 is a schematic structural diagram of Embodiment 2 of a base station according to the present invention.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. It is a partial embodiment of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

FIG. 1 is a flowchart of Embodiment 1 of an asymmetric uplink carrier aggregation method according to the present invention. As shown in FIG. 1 , the method in this embodiment may include:

S101. The base station decomposes the N downlink carriers and the M uplink carriers into multiple carrier aggregation clusters, where each carrier aggregation cluster includes one downlink carrier and K uplink carriers, where N is less than or equal to M, and K is an integer greater than or equal to 1. One uplink carrier corresponding to the downlink carrier and the downlink carrier form a primary carrier, and the remaining K-1 uplink carriers are secondary carriers.

Specifically, as shown in FIG. 2, FIG. 2 is a schematic diagram of N downlink carriers and M uplink carriers, and FIG. 3 is a schematic diagram of carrier aggregation decomposition. As shown in FIG. 3, the base station decomposes N downlink carriers and M uplink carriers. As a plurality of carrier aggregation clusters, each carrier aggregation cluster includes one downlink carrier and at least one uplink carrier. FIG. 4 is a schematic diagram of a primary carrier and a secondary carrier, as shown in FIG. 4, When the decomposed carrier aggregation cluster includes one downlink carrier and K uplink carriers, one uplink carrier and the downlink carrier corresponding to the downlink carrier are configured to form a primary carrier, and the remaining K-1 uplink carriers are defined as secondary carriers.

The K uplink carriers included in each carrier aggregation cluster are at least one of the following carriers: consecutive carriers in the same frequency band; non-contiguous carriers in the same frequency band; carriers in different frequency bands.

S102. The base station performs carrier aggregation on multiple carrier aggregation clusters.

Specifically, the base station performs carrier aggregation on multiple carrier aggregation clusters, which is actually an aggregation between primary carriers. For a plurality of carrier aggregation clusters, each carrier aggregation cluster is a cell (Cell), and the base station performs carrier aggregation on multiple carrier aggregation clusters, for example, aggregation of primary carriers of multiple carrier aggregation clusters, which may be used for each The UE allocates a plurality of carrier aggregation clusters, and specifies one of the carrier aggregation clusters as a primary cell (Primary Cell, PCell), and the other carrier clusters are secondary cells (Secondary Cell, referred to as SCell). The physical downlink control channel (Physical Downlink Control Channel, PDCCH for short) in the PCell/SCell respectively schedules resources in the PCell/SCell, and can also perform scheduling across the cells.

In the asymmetric uplink carrier aggregation method provided by the embodiment, the downlink carrier and the uplink carrier are decomposed into multiple carrier aggregation clusters by the base station, and each carrier aggregation cluster includes one downlink carrier and K uplink carriers, and then aggregates clusters for multiple carriers. Perform carrier aggregation. Therefore, the carrier aggregation of the downlink carrier is smaller than that of the uplink carrier, and the scenario that the uplink service requirement is greater than the downlink service requirement can be met.

Further, because of the scarcity of the spectrum resources, it is difficult to obtain the authorized uplink carrier in the asymmetric uplink carrier aggregation, and it is generally difficult to obtain the uplink grant spectrum that meets the uplink service requirement. Therefore, in the embodiment of the present invention, the base station selects the authorization. The frequency band is used as the primary carrier, and the base station selects the white frequency spectrum as the secondary carrier. The actual usage rate of the existing white spectrum frequency is very low, and the interference spectrum can be selected to use the spectrum with less interference as the uplink carrier of the asymmetric uplink carrier aggregation. When the white spectrum is used as the uplink secondary carrier for asymmetric carrier aggregation, since there is no base station transmission, only the terminal transmits, the terminal transmits power is relatively low, and the antenna frame height is relatively short, so that the introduction of the white spectrum can be better solved. There are systems (such as digital TV (DigitalTV, DTV), etc.) interference.

FIG. 5 is a flowchart of Embodiment 2 of the asymmetric uplink carrier aggregation method of the present invention. As shown in FIG. 5, the method in this embodiment may further include:

S103. The base station selects a downlink carrier and an uplink carrier as the primary carrier from the licensed frequency band, and the base station selects the uplink carrier as the secondary carrier from the white frequency spectrum.

The base station selects an uplink carrier as a secondary carrier from the white space, which may be:

S1031: The base station performs interference measurement on each narrowband frequency point in the preset white space frequency band to obtain interference measurement values of each narrowband frequency point.

For example, for a wider white spectrum, it is assumed to contain a plurality of relatively narrow band frequencies: f ₀ f ₁ ... f _N-1 . The base station needs to perform interference measurement on each narrowband frequency point in the preset frequency band to obtain interference measurement values I ₀ I ₁ ... I _{N-1 for} each narrowband frequency point.

S1032: The base station selects, according to the obtained interference measurement value, a frequency band with the smallest interference measurement value as an uplink carrier of the secondary carrier. or,

The base station selects a frequency band as the uplink carrier of the secondary carrier according to the obtained interference measurement value, blocking characteristic, and interference feature.

The blocking characteristic refers to that the selected secondary carrier frequency needs to satisfy the blocking characteristic of the base station, and the interference feature refers to: for some narrow-band strong interference, the base station can be circumvented by using a resource block (Resource Block, RB for short). It is necessary to consider the interference remaining after shielding. Further, compared with only the interference measurement value, the frequency band comprehensively selected according to the interference measurement value, the blocking characteristic and the interference characteristic is more accurate as the secondary carrier.

Specifically, for the uplink carrier selected as the secondary carrier from the white spectrum, the most important is the interference measurement of the white spectrum, and the interference measurement accuracy determines the performance of the asymmetric uplink carrier aggregation. The base station performs interference measurement on each narrowband frequency point in the preset white space frequency band, which may include:

The base station performs periodic interference measurement on each narrowband frequency point in the preset frequency band according to the measurement period, the measurement length, and the measurement start time predefined by the base station.

In order to avoid interference with the influence of intra-system interference during the measurement process, the terminal needs to stop transmitting data at the measurement time, so that the terminal stops transmitting data at the measurement time in the following two ways: the measurement determined at the measurement length and the measurement start time. The base station no longer dispatches the end user during the time period, or

The end user stops transmitting data during the measurement period determined by the measurement length and the measurement start time.

Specifically, before the base station performs periodic interference measurement on each narrowband frequency point in the preset frequency band according to the measurement period, the measurement length, and the measurement start time predefined by the base station, the base station broadcasts the notification station to the terminal user. The measurement period, the measurement length, and the measurement start time are performed to cause the end user to stop transmitting data during the measurement period determined by the measurement length and the measurement start time.

In the second mode, relevant interference measurement time information can be added to the broadcast channel, such as measurement period, measurement length, and measurement start time. The terminal receives the interference measurement time information, and can stop the uplink transmission at the measurement time, and the base station can perform uplink interference measurement during this time to select an appropriate secondary carrier. When all the base stations are configured with the same interference measurement time information, the base station can ensure that the interference of other cells is avoided when performing uplink interference measurement, thereby ensuring the accuracy of the uplink interference measurement.

Among them, since the interference of each base station is not the same, the center frequency of the secondary carrier selected based on the white spectrum is also different. Since the frequency of the white spectrum is only used for uplink, all handover related measurements are based on the downlink primary carrier. Therefore, the handover is independent of the selection of the secondary carrier, and is only related to the networking mode of the primary carrier. If the primary carrier adopts the same-frequency networking, the handover is the same-frequency handover based on the primary carrier. If the primary carrier uses the different-frequency networking, the handover is performed. It is an inter-frequency switching based on the primary carrier.

The asymmetric uplink carrier aggregation method provided in this embodiment is configured to select a downlink carrier and an uplink carrier as the primary carrier from the licensed frequency band in the scenario that the uplink service requirement is greater than the downlink service requirement, and the base station uses the white spectrum. The uplink carrier selected as the secondary carrier solves the problem of the availability of the secondary carrier in the uplink carrier aggregation. Moreover, in this embodiment, the white spectrum is only used for the uplink, and only the terminal transmits, the terminal power is small, and the shelf height is low, so that the coexistence problem with other systems can be better solved. The availability of white spectrum is further increased.

FIG. 6 is a schematic structural diagram of Embodiment 1 of a base station according to the present invention. As shown in FIG. 6, the base station in this embodiment may include: a decomposition module 11 and a processing module 12, where the decomposition module 11 is configured to use N downlink carriers and M The uplink carrier is decomposed into multiple carrier aggregation clusters, where each carrier aggregation cluster includes one downlink carrier and K uplink carriers, N is less than or equal to M, K is an integer greater than or equal to 1, an uplink carrier corresponding to the downlink carrier, and the The downlink carrier constitutes a primary carrier, and the remaining K-1 uplink carriers are secondary carriers. The processing module 12 is configured to aggregate the multiple carriers Perform carrier aggregation.

The K uplink carriers included in each carrier aggregation cluster are at least one of the following carriers: consecutive carriers in the same frequency band; non-contiguous carriers in the same frequency band; carriers in different frequency bands.

The device in this embodiment may be used to implement the technical solution of the method embodiment shown in FIG. 1 , and the implementation principle is similar, and details are not described herein again.

The base station provided in this embodiment is configured to decompose the downlink carrier and the uplink carrier into multiple carrier aggregation clusters by using a decomposition module, where each carrier aggregation cluster includes one downlink carrier and K uplink carriers, and then the processing module performs carrier on multiple carrier aggregation clusters. polymerization. Therefore, the carrier aggregation of the downlink carrier is smaller than that of the uplink carrier, and the scenario that the uplink service requirement is greater than the downlink service requirement can be met.

FIG. 7 is a schematic structural diagram of Embodiment 2 of a base station according to the present invention. As shown in FIG. 7, the base station of this embodiment may further include: a selection module 13 for selecting a module 13 on the basis of FIG. The decomposing module 11 decomposes the N downlink carriers and the M uplink carriers into multiple carrier aggregation clusters, selects a downlink carrier and an uplink carrier as the primary carrier from the licensed frequency band, and selects an uplink carrier as the secondary carrier from the white frequency spectrum. .

Further, the selection module 13 includes an interference measurement unit 131 and a selection unit 132. The interference measurement unit 131 is configured to perform interference measurement on each narrowband frequency point in the preset white space frequency band to obtain interference measurement values of each narrowband frequency point. The selecting unit 132 is configured to select, according to the obtained interference measurement value, a white space frequency band with the smallest interference measurement value as an uplink carrier of the secondary carrier, or according to the obtained interference measurement value, blocking characteristic, and interference feature. A frequency band is selected as the uplink carrier of the secondary carrier.

Specifically, the interference measurement unit 131 performs interference measurement on each narrowband frequency point in the preset white space frequency band, including:

Performing periodic interference measurement on each of the narrowband frequency points in the preset white space frequency band according to the measurement period, the measurement length, and the measurement start time predefined by the base station.

The base station does not schedule the terminal user within the measurement time period determined by the measurement length and the measurement start time, or

The end user stops transmitting data during the measurement period determined by the measurement length and the measurement start time.

The device in this embodiment may be used to implement the technical solution of the method embodiment shown in FIG. 5, and the implementation principle is similar, and details are not described herein again.

The base station provided in this embodiment is configured to select a downlink carrier and an uplink carrier as the primary carrier from the licensed frequency band, and select the secondary carrier as the secondary carrier from the white frequency spectrum in the scenario that the uplink service requirement is greater than the downlink service requirement. The uplink carrier solves the problem of the availability of the secondary carrier in the uplink carrier aggregation. Moreover, in this embodiment, the white spectrum is only used for the uplink, and only the terminal transmits, the terminal power is small, and the shelf height is low, so that the coexistence problem with other systems can be better solved. The availability of white spectrum is further increased.

One of ordinary skill in the art will appreciate that all or part of the steps to implement the various method embodiments described above may be accomplished by hardware associated with the program instructions. The aforementioned program can be stored in a computer readable storage medium. The program, when executed, performs the steps including the foregoing method embodiments; and the foregoing storage medium includes various media that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that The technical solutions described in the foregoing embodiments may be modified, or some or all of the technical features may be equivalently replaced; and the modifications or substitutions do not deviate from the technical solutions of the embodiments of the present invention. range.

Claims (10)

An asymmetric uplink carrier aggregation method, comprising: The base station decomposes the N downlink carriers and the M uplink carriers into multiple carrier aggregation clusters, where each carrier aggregation cluster includes one downlink carrier and K uplink carriers, where N is less than or equal to M, and K is an integer greater than or equal to 1, and downlink One uplink carrier corresponding to the carrier and the downlink carrier form a primary carrier, and the remaining K-1 uplink carriers are secondary carriers; The base station performs carrier aggregation on the multiple carrier aggregation clusters. The method according to claim 1, wherein the K uplink carriers included in each carrier aggregation cluster are at least one of the following carriers: Continuous carriers in the same frequency band; Non-contiguous carriers in the same frequency band; Carriers in different frequency bands. The method according to claim 1 or 2, wherein before the base station decomposes the N downlink carriers and the M uplink carriers into a plurality of carrier aggregation clusters, the method further includes: The base station selects a downlink carrier and an uplink carrier as primary carriers from the licensed frequency band, and the base station selects an uplink carrier as a secondary carrier from the white frequency spectrum. The method according to claim 3, wherein the base station selects an uplink carrier as a secondary carrier from the white spectrum, including: The base station performs interference measurement on each narrowband frequency point in the preset white space frequency band to obtain interference measurement values of each narrowband frequency point; The base station selects, according to the obtained interference measurement value, a white space frequency band with the smallest interference measurement value as an uplink carrier of the secondary carrier, or The base station selects a frequency band as the uplink carrier of the secondary carrier according to the obtained interference measurement value, blocking characteristic, and interference feature. The method according to claim 4, wherein the base station performs interference measurement on each narrowband frequency point in the preset white space frequency band, including: Performing, by the base station, periodic interference measurement on each narrowband frequency point in the preset white space frequency band according to the measurement period, the measurement length, and the measurement start time predefined by the base station; The base station does not schedule the terminal user within the measurement time period determined by the measurement length and the measurement start time, or The end user stops transmitting data during the measurement period determined by the measurement length and the measurement start time. A base station, comprising: The decomposition module is configured to decompose the N downlink carriers and the M uplink carriers into multiple carrier aggregation clusters, where each carrier aggregation cluster includes one downlink carrier and K uplink carriers, where N is less than or equal to M, and K is greater than or equal to 1 The integer carrier, the uplink carrier corresponding to the downlink carrier and the downlink carrier form a primary carrier, and the remaining K-1 uplink carriers are secondary carriers; And a processing module, configured to perform carrier aggregation on the multiple carrier aggregation clusters. The base station according to claim 6, wherein the K uplink carriers included in each carrier aggregation cluster are at least one of the following carriers: Continuous carriers in the same frequency band; Non-contiguous carriers in the same frequency band; Carriers in different frequency bands. The base station according to claim 6 or 7, further comprising: And a selecting module, configured to: before the decomposing module decomposes the N downlink carriers and the M uplink carriers into multiple carrier aggregation clusters, select a downlink carrier and an uplink carrier as the primary carrier from the licensed frequency band, and select from the white frequency spectrum The upstream carrier of the secondary carrier. The base station according to claim 8, wherein the selection module comprises: The interference measurement unit is configured to perform interference measurement on each narrowband frequency point in the preset white space frequency band to obtain interference measurement values of each narrowband frequency point; a selecting unit, configured to select, according to the obtained interference measurement value, a white space frequency band with the smallest interference measurement value as an uplink carrier of the secondary carrier, or Selecting a frequency band as the uplink carrier of the secondary carrier according to the obtained interference measurement value, blocking characteristic, and interference characteristic. The base station according to claim 9, wherein the interference measuring unit performs interference measurement on each narrowband frequency point in the preset white space frequency band, including: Performing periodic interference measurement on each narrowband frequency point in the preset white space frequency band according to the measurement period, the measurement length, and the measurement start time predefined by the base station; The base station does not schedule the terminal user within the measurement time period determined by the measurement length and the measurement start time, or The end user stops transmitting data during the measurement period determined by the measurement length and the measurement start time.

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