JP7418961B2 - Base station and wireless communication control method - Google Patents

Description

The present disclosure relates to a base station and a wireless communication control method.

Long Term Evolution (LTE) has been specified in the Universal Mobile Telecommunication System (UMTS) network with the aim of achieving even higher data rates and lower latency. In addition, a successor system to LTE is also being considered with the aim of further increasing the bandwidth and speed of LTE. Successor systems to LTE include, for example, LTE-Advanced (LTE-A), Future Radio Access (FRA), 5th generation mobile communication system (5G), 5G plus (5G+), Radio Access Technology (New-RAT), New There is a system called Radio (NR).

Additionally, the 3rd Generation Partnership Project (3GPP) is considering specifications for user equipment (UE) for the Internet of Things (IoT).

3GPP TS 36.331 v15.4.0, “Radio Resource Control (RRC);Protocol specification (Release 15),” December 2018

Wireless communication for the Internet of Things (IoT) will be considered for operation in the resource area used by existing (or legacy) wireless communication systems.

However, there is room for consideration regarding resource allocation (or setting) in this operation, or in other words, coexistence with existing wireless communication systems.

One of the purposes of the present disclosure is to appropriately allocate resources in a wireless communication system that coexists with an existing wireless communication system.

The base station according to one aspect of the present disclosure is configured to perform second wireless communication that has a higher priority regarding wireless resource allocation than the first wireless communication system, out of the amount of wireless resources that can be allocated in the first wireless communication system. The wireless communication system includes a control unit that sets an upper limit to the amount of wireless resources that can be allocated in the system, and a transmitter that transmits information on wireless resources allocated to the second wireless communication system within a range that is equal to or less than the upper limit.

According to the present disclosure, it is possible to appropriately allocate resources in a wireless communication system that coexists with an existing wireless communication system.

FIG. 3 is a diagram illustrating an example of LTE resource allocation control. FIG. 3 is a diagram illustrating an example of resource allocation control between IoT and LTE. FIG. 1 is a block diagram showing an example of the configuration of a base station according to an embodiment. 1 is a block diagram illustrating an example of the configuration of a terminal according to an embodiment. FIG. FIG. 3 is a diagram illustrating an example of resource amount restriction in one embodiment. FIG. 2 is a diagram illustrating an example of a resource amount limiting method 1 in an embodiment. FIG. 2 is a diagram illustrating an example of a resource amount limiting method 2 in an embodiment. FIG. 2 is a diagram illustrating an example of the hardware configuration of a base station and a terminal according to an embodiment.

Embodiments according to one aspect of the present disclosure will be described below with reference to the drawings.

3GPP is considering wireless communication systems for IoT (for example, specifications for user equipment (UE)). For example, as wireless communication systems for IoT, a wireless communication system called Category.M (Cat.M) and a wireless communication system called Narrow band-IoT (NB IoT) are being considered.

NB-IoT is a wireless communication system for IoT (hereinafter referred to as IoT) that uses a narrow band (for example, 200kHz). Cat.M, like NB-IoT, is an IoT being considered by 3GPP. Cat.M may specify different parameters from NB-IoT regarding parameters such as bandwidth used, communication method, and communication speed.

In IoT (Cat.M and/or NB-IoT), coexistence with other wireless communication systems may be expected. An example of a system that is expected to coexist with IoT is Legacy LTE (hereinafter referred to as "LTE").

When IoT and LTE coexist in the same radio resource area, for example, when IoT and LTE share the same radio resource, aspects of resource allocation control in each system will be considered.

Hereinafter, resources allocated to a wireless communication device (for example, a terminal) that supports LTE communication may be referred to as "resources allocated to LTE" or "LTE resources." Resources allocated to wireless communication devices (e.g., terminals) that support IoT communication are sometimes described as "resources allocated to IoT" or "IoT resources."

In addition, the respective resource amounts of "LTE resources" and "IoT resources" may be described as "LTE resource amount" and "IoT resource amount".

Note that the method of expressing the amount of resources in each wireless communication system is not particularly limited. The amount of resources may be expressed, for example, by the amount of time-frequency resources allocated to the terminal in a resource domain defined by a time domain and a frequency domain. Alternatively, the amount of resources may be expressed by the number of multiplexed terminals and/or the amount of known signals for system operation. The known signal may be, for example, broadcast information and/or a random access channel (RACH).

FIG. 1A is a diagram illustrating an example of LTE resource allocation control. FIG. 1B is a diagram illustrating an example of resource allocation control between IoT and LTE. The horizontal axis in FIGS. 1A and 1B is the time axis, and the vertical axis is the amount of resources. 1A and 1B represent, for example, the amount of resources in units of one Transmission Time Interval (TTI).

If other wireless communication systems (e.g., IoT) do not share the same radio resources as LTE, in other words, if LTE can occupy radio resources, the amount of LTE resources will be The maximum amount of resources that can be allocated may be secured. Note that the maximum value of the amount of resources may be defined by the processing limit of the device and/or the limit of wireless resources.

On the other hand, when IoT and LTE share the same radio resource, the sum of the LTE resource amount and the IoT resource amount is set to be less than or equal to the maximum value of the resource amount, as shown in FIG. 1B.

For example, in scheduling regarding resource allocation in IoT, control in the time domain (for example, timing relation and repetition in the Control Part) is taken into consideration, so resource allocation is executed at an earlier stage compared to LTE. In other words, IoT secures resources before LTE.

For example, if the difference between the maximum amount of resources that can be allocated in LTE and the amount of IoT resources secured before LTE is less than the expected amount of resources in LTE, Difficult to secure. Therefore, LTE performance (for example, the overall LTE throughput and the number of multiplexed terminals) may deteriorate.

Therefore, in this embodiment, in resource allocation between LTE and IoT (Cat.M and/or NB-IoT) that share the same radio resources as LTE, we will introduce a method for flexibly setting the amount of resources for each system. explain.

[Base station and terminal configuration]
FIG. 2 is a block diagram showing an example of the configuration of base station 10 according to this embodiment. FIG. 3 is a block diagram showing an example of the configuration of terminal 20 according to this embodiment.

The base station 10 supports IoT (NB-IoT and/or Cat.M) and LTE wireless communication systems. Furthermore, the terminal 20 supports at least one of IoT and LTE wireless communication systems.

Base station 10 includes, for example, a transmitter 101, a receiver 102, and a controller 103.

Transmitting section 101 transmits a downlink (DL) signal to terminal 20 under the control of control section 103 . The DL signal may include channel quality information, a control channel signal containing control information, a data channel signal containing data, a reference signal, or the like. Further, the DL signal may include control information indicating resources allocated to the terminal 20 by scheduling of the base station 10.

Receiving section 102 receives an uplink (UL) signal transmitted from terminal 20 under the control of control section 103 . The UL signal may include channel quality information, a control channel signal containing control information, a data channel signal containing data, a reference signal, or the like.

The control unit 103 controls the transmission processing in the transmission unit 101 and the reception processing in the reception unit 102. For example, control section 103 receives data, control information, etc. from an upper layer, and outputs it to transmitting section 101. Further, the control unit 103 outputs the data, control information, etc. received from the reception unit 102 to the upper layer.

Further, for example, the control unit 103 performs resource allocation (scheduling) in communication with the terminal 20. For example, the control unit 103 sets the amount of IoT resources and the amount of LTE resources in units of 1 TTI. Then, the control unit 103 allocates resources to the terminals 20 that support IoT communication in the wireless resource area based on the amount of IoT resources. Furthermore, the control unit 103 allocates resources to the terminals 20 that support LTE communication in the radio resource area based on the amount of LTE resources. Control section 103 outputs control information indicating resources allocated to terminal 20 to transmitting section 101 .

Note that settings for the amount of IoT resources and the amount of LTE resources will be described later.

The terminal 20 includes, for example, a receiving section 201, a transmitting section 202, and a control section 203.

Receiving section 201 receives a DL signal transmitted from base station 10 under the control of control section 203 .

The transmitter 202 transmits the UL signal to the base station 10 under the control of the controller 203 .

The control unit 203 controls reception processing in the reception unit 201 and transmission processing in the transmission unit 202. For example, the control section 203 receives data, control information, etc. from an upper layer, and outputs it to the transmission section 202. Further, the control unit 103 outputs the data, control information, etc. received from the reception unit 201 to the upper layer.

For example, the control unit 203 controls transmission processing based on control information indicating resources allocated to the terminal 20.

Next, settings for IoT resource amount and LTE resource amount will be explained.

Note that below, as an example, an example will be described in which LTE and two IoTs, Cat.M and NB-IoT, share the same radio resource. When two IoTs are distinguished, the two IoTs may be written as IoT#A and IoT#B, respectively. For example, IoT#A may correspond to NB-IoT, and IoT#B may correspond to Cat.M. Alternatively, IoT#B may be compatible with NB-IoT, and IoT#A may be compatible with Cat.M.

In addition, in the following, among LTE, IoT#A, and IoT#B, resource allocation in IoT#A is executed first, then resource allocation in IoT#B, and finally resource allocation in LTE. executed. In other words, the priority of resource allocation is assumed to be in the order of IoT#A, IoT#B, and LTE from the highest priority.

In this embodiment, when allocating resources to a plurality of wireless communication systems, the amount of resources of a wireless communication system to which resource allocation is performed first is determined based on the amount of resources of a wireless communication system to which resource allocation is performed later. Restrict.

FIG. 4 is a diagram illustrating an example of resource amount restriction in this embodiment.

FIG. 4 shows three correspondences between resource amounts of two wireless communication systems. In the first correspondence relationship, the horizontal axis indicates the amount of LTE resources, and the vertical axis indicates the amount of resources for IoT#B. In the second correspondence relationship, the horizontal axis shows the resource amount of IoT#A, and the vertical axis shows the resource amount of IoT#B. In the third correspondence relationship, the horizontal axis indicates the amount of IoT#A resources, and the vertical axis indicates the amount of LTE resources.

Note that W indicates the amount of resources for LTE, X indicates the amount of resources for IoT#B, and Y indicates the amount of resources for IoT#A. Furthermore, the applicable area in each correspondence relationship corresponds to the upper limit of the resource amount of one of the two wireless communication systems, which is defined according to the resource amount of the other.

For example, in the first correspondence relationship, the LTE resource amount W is set, and the IoT#B resource amount X corresponding to the LTE resource amount W is set. For example, the LTE resource amount W may be the resource amount that is estimated to be allocated in LTE. For example, the LTE resource amount W may be the LTE resource amount measured in a predetermined section, or may be set by a parameter input from the outside. Note that the term "estimated" may be replaced with another term such as "estimated" or "anticipated."

In the first correspondence relationship, for example, the larger the LTE resource amount W, the more the IoT#B resource amount X is limited (set to a smaller amount).

For example, in the second correspondence relationship, the resource amount X of IoT#B is set, and the resource amount Y of IoT#A corresponding to the resource amount X of IoT#B is set. For example, the resource amount X of IoT#B may be the resource amount that is estimated to be allocated in IoT#B. For example, the resource amount X of IoT#B may be the resource amount of IoT#B measured in a predetermined section, or may be set by a parameter input from the outside.

In the second correspondence relationship, for example, the greater the resource amount X of IoT#B, the more limited the resource amount Y of IoT#A is (set to a smaller amount).

For example, in the third correspondence relationship, the LTE resource amount W is set, and the IoT#A resource amount Y corresponding to the LTE resource amount W is set. For example, the LTE resource amount W may be the resource amount that is estimated to be allocated in LTE. For example, the LTE resource amount W may be the LTE resource amount measured in a predetermined section, or may be set by a parameter input from the outside.

In the third correspondence relationship, for example, the larger the LTE resource amount W, the more the IoT#A resource amount Y is limited (set to a smaller amount).

Here, the amount of resources measured in a predetermined interval may be, for example, the average value of the amount of resources measured in a predetermined time interval before the implementation of resource allocation, or the maximum value of the amount of resources. It may be the minimum value of the amount of resources. For example, when the amount of resources is defined by the number of multiplexed terminals, the amount of resources measured in a predetermined interval is represented by at least one of the average value, maximum value, and minimum value of the multiplexed number of terminals. Ru. Note that the predetermined section may be a time section in units of multiple TTIs, or may be a time section in units of several hours or one day.

In the first to third correspondence relationships, of the two wireless communication systems, the amount of resources of the wireless communication system to which resources are allocated first is limited based on the amount of resources of the wireless communication system to which resources are allocated later.

Note that in the first to third correspondence relationships, resource amount limitations between two wireless communication systems have been described, but the present disclosure is not limited thereto. For example, the amount of resources may be limited between three wireless communication systems: LTE, IoT#A, and IoT#B.

For example, in the first correspondence relationship, the LTE resource amount W is set, and the IoT#B resource amount X corresponding to the LTE resource amount W is set. Then, in the second correspondence relationship, the resource amount Y of IoT #A that corresponds to the resource amount X of IoT #B set according to the first correspondence relationship may be set.

Furthermore, in the first to third correspondence relationships, an upper limit Z may be set for the sum of the resource amount Y of IoT#A and the resource amount X of IoT#A. For example, X and Y, where X+Y≦Z holds, may be set as the resource amount. Note that the sum of the resource amount Y of IoT#A and the resource amount X of IoT#A may be described as the resource amount of the entire IoT.

Two methods will be described below as examples.

[Method 1]
In method 1, the upper limit of the amount of resources for IoT#B is set based on the amount of resources for LTE.

As described above, the base station 10 first performs resource allocation for IoT#A among LTE, IoT#A, and IoT#B. Therefore, the base station 10 sets the resource amount Y for IoT#A and executes resource allocation in IoT#A.

After executing resource allocation in IoT#A, the base station 10 executes resource allocation in IoT#B. Here, the base station 10 sets an upper limit for the amount of resources for IoT#B based on the amount of resources for LTE.

FIG. 5 is a diagram illustrating an example of the resource amount limiting method 1 in this embodiment. FIG. 5 shows two correspondence relationships regarding resource amounts. In the fourth correspondence relationship, the horizontal axis indicates the amount of LTE resources, and the vertical axis indicates the amount of resources for IoT#B. In the fifth correspondence relationship, the horizontal axis indicates the resource amount of IoT#A, and the vertical axis indicates the resource amount of the entire IoT. Note that the fourth correspondence relationship may be considered as an example of the first correspondence relationship shown in FIG. 4.

In the fourth correspondence relationship, three thresholds Th(1) _LB , Th(2) _LB , and Th(3) _LB are provided for the LTE resource amount. The thresholds Th(1) _LB , Th(2) _LB , and Th(3) _LB are respectively associated with the resource amounts X(1), X(2), and X(3) of IoT#B. .

The base station 10 sets the amount of LTE resources W. For example, the LTE resource amount W may be the LTE resource amount measured in a predetermined section, or may be set by a parameter input from the outside.

Then, the base station 10 sets the upper limit of the resource amount X of IoT#B using the fourth correspondence relationship.

For example, in the example of the fourth correspondence relationship in FIG. 5, the set LTE resource amount W is less than Th(1) _LB , so the upper limit of the IoT#B resource amount X is set to X(1). be done.

Next, the base station 10 determines whether Y+X(1)≦Z holds regarding the resource amount Z of the entire IoT. Then, when Y+X(1)≦Z holds true, the base station 10 sets X(1) as the upper limit of the resource amount of IoT#B. If Y+X(1)≦Z does not hold, that is, if Y+X(1)>Z holds, the base station 10 reduces the upper limit X(1) of the resource amount of IoT#B and satisfies Y+X _M ≦Z. Set X _M as the upper limit of IoT#B's resource amount. Then, the base station 10 executes resource allocation in IoT#B.

For example, in the example of the fifth correspondence relationship in _FIG . ) as the upper limit of IoT#B's resource amount. On the other hand, if the resource amount Y of IoT#A is larger than the boundary value _YP , for example, if the resource amount Y of IoT#A is _YQ shown in FIG. , and set X _M as the upper limit of IoT#B's resource amount.

As described above, in method 1, for example, the control unit 103 of the base station 10 sets an upper limit on the amount of resources that can be allocated in IoT#B, which has a higher priority regarding resource allocation than LTE, among the amount of resources that can be allocated in LTE. do. Then, the transmitting unit 101 transmits control information indicating the resources allocated to IoT #B within the range below the upper limit of the resource amount of IoT #B.

This setting sets an upper limit on the amount of resources for IoT#B, so even if LTE resources are allocated later than those for IoT#A and IoT#B, the amount of LTE resources can be secured.

Note that method 1 may be used, for example, when the LTE resource amount W is relatively small (for example, when the LTE resource amount W is less than or equal to the first specified value).

[Method 2]
In method 2, the upper limit of the resource amount of IoT#A is set based on one or both of the LTE resource amount and the IoT#B resource amount.

[Method 2-1]
In method 2-1, an example will be described in which an upper limit of the resource amount of IoT#A is set based on the resource amount of IoT#B.

FIG. 6 is a diagram showing an example of the resource amount limiting method 2 in this embodiment. FIG. 6 shows two correspondence relationships regarding resource amounts. In the sixth correspondence relationship, the horizontal axis shows the resource amount of IoT#B, and the vertical axis shows the resource amount of IoT#A. In the seventh correspondence relationship, the horizontal axis indicates the resource amount of IoT#B, and the vertical axis indicates the resource amount of the entire IoT. Note that the sixth correspondence relationship may be considered as an example of the second correspondence relationship shown in FIG. 4. However, in the sixth correspondence relationship, the vertical axis and the horizontal axis are switched with respect to the second correspondence relationship.

In the sixth correspondence relationship, three thresholds Th(1) _BA , Th(2) _BA , and Th(3) _BA are provided for the resource amount of IoT#B. The thresholds Th(1) _BA , Th(2) _BA , and Th(3) _BA are the resource amounts Y(1) _B , Y(2) _B , and Y(3) _B of IoT#A, respectively. Can be matched.

The base station 10 sets the resource amount X for IoT#B. For example, the resource amount X of IoT#B may be the resource amount of IoT#B measured in a predetermined section, or may be set by a parameter input from the outside.

Then, the base station 10 uses the sixth correspondence to set an upper limit _YB of the resource amount Y of IoT#A based on the resource amount X of IoT#B.

For example, in the example of the sixth correspondence relationship in FIG. 6, the set resource amount X of IoT#B is between Th(2) _BA and Th(3) _BA , so the resource amount Y of IoT#A is The upper limit of is set to Y(3) _B .

Next, the base station 10 determines whether Y(3) _B +X≦Z holds regarding the resource amount Z of the entire IoT. Then, when Y(3) _B +X≦Z holds true, the base station 10 sets Y(3) _B as the upper limit of the resource amount of IoT#A. If Y(3) _B +X≦Z does not hold, that is, if Y(3) _B +X>Z holds, the base station 10 reduces the upper limit Y(3) _B of the resource amount of IoT#A, and Set Y _M that satisfies _M + X≦Z as the upper limit of the resource amount of IoT#A. Then, the base station 10 executes resource allocation in IoT#A. After executing resource allocation in IoT#A, the base station 10 sequentially executes resource allocation in IoT#B and resource allocation in LTE.

For example, in the example of the seventh correspondence relationship in FIG. 6, if the resource amount X of _IoT # _B is less than or equal to the boundary value (3) Set _B as the upper limit of IoT#A's resource amount. On the other hand, if the resource amount X of IoT#B is larger than the boundary value _XP , for example, if the resource amount X of IoT#B is _XQ shown in FIG. Reduce the upper limit of Y(3) _B and set _YM as the upper limit of the resource amount of IoT#B.

As described above, in method 2-1, for example, the control unit 103 of the base station 10 sets an upper limit on the amount of resources that can be allocated in IoT#A, which has a higher priority regarding resource allocation than IoT#B.

This setting sets an upper limit for the amount of resources for IoT#A, so even if resource allocation for IoT#B is performed after IoT#A, the amount of resources for IoT#B can be secured.

Note that method 2-1 may be used, for example, when the resource amount X of IoT#B is relatively large (for example, when the resource amount X of IoT#B is larger than the second specified value).

Note that the resource amount Z for the entire IoT may be set based on the LTE resource amount W. For example, the base station 10 sets an LTE resource amount W. For example, the LTE resource amount W may be the LTE resource amount measured in a predetermined section, or may be set by a parameter input from the outside. Then, the amount obtained by subtracting the LTE resource amount W from the maximum value of the overall resource amount may be set as the overall IoT resource amount Z. The maximum value of the total amount of resources may be defined by, for example, the processing limit of the device and/or the limit of radio resources.

By setting the resource amount Z of the entire IoT based on the LTE resource amount W, even if LTE resource allocation is executed after IoT#A and IoT#B, the LTE resource amount can be secured.

[Method 2-2]
In method 2-2, an example will be described in which an upper limit of the amount of resources for IoT#A is set based on the amount of resources for LTE.

The base station 10 sets the amount of LTE resources W. For example, the LTE resource amount W may be the LTE resource amount measured in a predetermined section, or may be set by a parameter input from the outside. Then, the base station 10 sets the resource amount X for IoT#B. For example, the resource amount X of IoT#B may be the resource amount of IoT#B measured in a predetermined section, or may be set by a parameter input from the outside.

Then, the base station 10 sets an upper limit for the resource amount Y of IoT#A based on the LTE resource amount W.

For example, using the third correspondence relationship in FIG. 4, the base station 10 sets an upper limit _YL of the resource amount Y of IoT#A, which corresponds to the resource amount W of LTE.

Then, the base station 10 determines whether Y _L +X≦Z holds true regarding the resource amount Z of the entire IoT. Then, when Y _L +X≦Z holds true, the base station 10 sets Y _L as the upper limit of the resource amount of IoT#A. If Y _L +X≦Z does not hold, that is, if Y _L +X>Z holds, the base station 10 reduces the upper limit Y _L of the resource amount of IoT#A and sets Y _M that satisfies Y _M +X≦Z. Set the upper limit of IoT#A resource amount. Then, the base station 10 executes resource allocation in IoT#A. After executing resource allocation in IoT#A, the base station 10 sequentially executes resource allocation in IoT#B and resource allocation in LTE.

As described above, in method 2-2, for example, the control unit 103 of the base station 10 sets an upper limit on the amount of resources that can be allocated in IoT#A, which has a higher priority regarding resource allocation than LTE, among the amount of resources that can be allocated in LTE. Set. Then, the transmitting unit 101 transmits control information indicating the resources allocated to IoT #A within the range below the upper limit of the resource amount of IoT #A.

This setting sets an upper limit on the amount of resources for IoT#A, so even if LTE resource allocation is performed after IoT#A, the amount of LTE resources can be secured.

[Method 2-3]
In method 2-3, an example will be described in which an upper limit for the amount of resources for IoT#A is set based on the amount of resources for LTE and the amount of resources for IoT#B.

The base station 10 sets the amount of LTE resources W. For example, the LTE resource amount W may be the LTE resource amount measured in a predetermined section, or may be set by a parameter input from the outside. Then, the base station 10 sets the resource amount X for IoT#B. For example, the resource amount X of IoT#B may be the resource amount of IoT#B measured in a predetermined section, or may be set by a parameter input from the outside.

Then, the base station 10 sets an upper limit _YLB of the resource amount Y of IoT#A based on the resource amount W of LTE and the resource amount X of IoT#B.

For example, the base station 10 sets the upper limit _YB of the resource amount Y of IoT#A based on the resource amount X of IoT#B using a method similar to method 2-1, and In this method, an upper limit _YL of the resource amount Y of IoT#A is set based on the LTE resource amount W. Then, the base station 10 sets the upper limit _YLB to the smaller value of _YB and _YL . That is, Y _LB =min(Y _B , Y _L ).

Then, the base station 10 determines whether Y _LB +X≦Z holds true regarding the resource amount Z of the entire IoT. Then, when Y _LB +X≦Z holds true, the base station 10 sets Y _LB as the upper limit of the resource amount of IoT#A. If Y _LB +X≦Z does not hold, that is, if Y _LB +X>Z holds, the base station 10 reduces the upper limit Y _LB of the resource amount of IoT#A and sets Y _M that satisfies Y _M +X≦Z. Set the upper limit of IoT#A resource amount. Then, the base station 10 executes resource allocation in IoT#A. After executing resource allocation in IoT#A, the base station 10 sequentially executes resource allocation in IoT#B and resource allocation in LTE.

As described above, in method 2-3, for example, the control unit 103 of the base station 10, out of the amount of resources that can be allocated in LTE and IoT#B, selects IoT#A, which has a higher priority for resource allocation than LTE and IoT#B. Set an upper limit on the amount of resources that can be allocated. Then, the transmitting unit 101 transmits control information indicating the resources allocated to IoT #A within the range below the upper limit of the resource amount of IoT #A.

This setting sets an upper limit on the amount of resources for IoT#A, so even if resource allocation in LTE and resource allocation in IoT#B are executed after IoT#A, the amount of resources in LTE and The amount of resources for IoT#B can be secured.

Note that the base station 10 may switch between Method 1 and Methods 2-1 to 2-3 described above. For example, the base station 10 may switch depending on the LTE resource amount W and/or the IoT#B resource amount X estimated by measurement.

According to the present embodiment described above, for example, the amount of resources can be flexibly set between multiple wireless communication systems that share the same wireless resource, so that it is possible to flexibly set the amount of resources among multiple wireless communication systems that share the same wireless resource. , resource allocation can be done appropriately.

For example, according to the present embodiment, when allocating resources to a plurality of wireless communication systems, it is possible to limit the amount of resources of a wireless communication system to which resources are allocated based on the amount of resources of a wireless communication system to which the resources are allocated later. Therefore, for example, a sufficient amount of resources can be secured in LTE, where resources are allocated later than IoT, and it is possible to suppress a decline in LTE performance.

Note that in the embodiment described above, one base station 10 that supports three wireless communication systems, NB-IoT, Cat.M, and LTE, sets the amount of resources for each wireless communication system, and We have explained an example of executing resource allocation in . The present disclosure is not limited thereto; for example, base stations supporting three wireless communication systems may be different from each other, or base stations supporting two wireless communication systems (e.g., NB-IoT and Cat.M). A station may be different from a base station that supports one other wireless communication system (eg, LTE). In this case, any one of the plurality of base stations may set the amount of resources for each wireless communication system and notify the other base stations of information indicating the set amount of resources. Alternatively, in this case, a control device that controls a plurality of base stations may set the resource amount of each wireless communication system, and notify the plurality of base stations of information indicating the set resource amount.

Note that in the above-described embodiment, an example was given in which three wireless communication systems, NB-IoT, Cat.M, and LTE, coexist in the same wireless resource area, but the present disclosure is not limited to this. . For example, the present disclosure may be applied when two wireless communication systems, NB-IoT, Cat.M, and LTE, coexist in the same wireless resource area. Alternatively, the present disclosure may be applied even when one or more other wireless communication systems coexist in a radio resource area where three wireless communication systems, NB-IoT, Cat.M, and LTE, coexist.

(Hardware configuration)
It should be noted that the block diagram used to explain the above embodiment shows blocks in functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using one physically or logically coupled device, or may be realized using two or more physically or logically separated devices directly or indirectly (e.g. , wired, wireless, etc.) and may be realized using a plurality of these devices. The functional block may be realized by combining software with the one device or the plurality of devices.

Functions include judgment, decision, judgment, calculation, calculation, processing, derivation, investigation, exploration, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, consideration, These include, but are not limited to, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assigning. I can't. For example, a functional block (configuration unit) that performs transmission is called a transmitting unit or a transmitter. In either case, as described above, the implementation method is not particularly limited.

For example, a base station, a terminal, etc. in an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. FIG. 7 is a diagram illustrating an example of the hardware configuration of a base station and a terminal according to an embodiment of the present disclosure. The base station 10 and terminal 20 described above may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.

In addition, in the following description, the word "apparatus" can be read as a circuit, a device, a unit, etc. The hardware configuration of the base station 10 and the terminal 20 may be configured to include one or more of each device shown in the figure, or may be configured not to include some of the devices.

Each function in the base station 10 and the terminal 20 is performed by loading predetermined software (programs) onto hardware such as the processor 1001 and memory 1002, so that the processor 1001 performs calculations and controls communication by the communication device 1004. This is realized by controlling at least one of data reading and writing in the memory 1002 and the storage 1003.

The processor 1001, for example, operates an operating system to control the entire computer. The processor 1001 may be configured by a central processing unit (CPU) including an interface with a peripheral device, a control device, an arithmetic device, a register, and the like. For example, the above-described control unit 103, control unit 203, etc. may be realized by the processor 1001.

Furthermore, the processor 1001 reads programs (program codes), software modules, data, and the like from at least one of the storage 1003 and the communication device 1004 to the memory 1002, and executes various processes in accordance with these. As the program, a program that causes a computer to execute at least part of the operations described in the above embodiments is used. For example, the control unit 103 of the base station 10 or the control unit 203 of the terminal 20 may be realized by a control program stored in the memory 1002 and operated in the processor 1001, and other functional blocks may also be realized in the same way. good. Although the various processes described above have been described as being executed by one processor 1001, they may be executed by two or more processors 1001 simultaneously or sequentially. Processor 1001 may be implemented by one or more chips. Note that the program may be transmitted from a network via a telecommunications line.

The memory 1002 is a computer-readable recording medium, and includes at least one of ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory), and the like. may be done. Memory 1002 may be called a register, cache, main memory (main memory), or the like. The memory 1002 can store executable programs (program codes), software modules, and the like to implement a wireless communication method according to an embodiment of the present disclosure.

The storage 1003 is a computer-readable recording medium, such as an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk (such as a compact disk, a digital versatile disk, or a Blu-ray disk). (registered trademark disk), smart card, flash memory (eg, card, stick, key drive), floppy disk, magnetic strip, etc. Storage 1003 may also be called an auxiliary storage device. The storage medium mentioned above may be, for example, a database including at least one of memory 1002 and storage 1003, a server, or other suitable medium.

The communication device 1004 is hardware (transmission/reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, or the like. The communication device 1004 includes, for example, a high frequency switch, a duplexer, a filter, a frequency synthesizer, etc. to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). It may be composed of. For example, the above-described transmitting section 101, receiving section 102, receiving section 201, transmitting section 202, etc. may be realized by the communication device 1004.

The input device 1005 is an input device (eg, keyboard, mouse, microphone, switch, button, sensor, etc.) that accepts input from the outside. The output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that performs output to the outside. Note that the input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).

Further, each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses for each device.

The base station 10 and the terminal 20 also include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), and a field programmable gate array (FPGA). A part or all of each functional block may be realized by the hardware. For example, processor 1001 may be implemented using at least one of these hardwares.

(information notification, signaling)
Notification of information is not limited to the aspects/embodiments described in this disclosure, and may be performed using other methods. For example, the notification of information may include physical layer signaling (e.g., DCI (Downlink Control Information), UCI (Uplink Control Information)), upper layer signaling (e.g., RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, It may be implemented using broadcast information (MIB (Master Information Block), SIB (System Information Block))), other signals, or a combination thereof. Further, RRC signaling may be called an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, or the like.

(Applicable system)
Each aspect/embodiment described in this disclosure applies to LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), and 5G (5th generation mobile communication system). system), FRA (Future Radio Access), NR (New Radio), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark) )), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), and systems that utilize and are extended based on these. It may be applied to at least one next generation system. Furthermore, a combination of a plurality of systems may be applied (for example, a combination of at least one of LTE and LTE-A and 5G).

(Processing procedures, etc.)
The order of the processing procedures, sequences, flowcharts, etc. of each aspect/embodiment described in this disclosure may be changed as long as there is no contradiction. For example, the methods described in this disclosure use an example order to present elements of the various steps and are not limited to the particular order presented.

(Base station operation)
The specific operations performed by the base station in this disclosure may be performed by its upper node in some cases. In a network consisting of one or more network nodes having a base station, various operations performed for communication with a terminal are performed by the base station and other network nodes other than the base station (e.g., MME or It is clear that this can be done by at least one of the following: conceivable, but not limited to S-GW. Although the case where there is one network node other than the base station is illustrated above, it may be a combination of multiple other network nodes (for example, MME and S-GW).

(input/output direction)
Information etc. (*Refer to the item "Information, Signal") can be output from an upper layer (or lower layer) to a lower layer (or upper layer). It may be input/output via multiple network nodes.

(Handling of input/output information, etc.)
The input/output information may be stored in a specific location (for example, memory) or may be managed using a management table. Information etc. to be input/output may be overwritten, updated, or additionally written. The output information etc. may be deleted. The input information etc. may be transmitted to other devices.

(Judgment method)
Judgment may be made using a value expressed by 1 bit (0 or 1), a truth value (Boolean: true or false), or a comparison of numerical values (for example, a predetermined value). (comparison with a value).

(software)
Software includes instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, whether referred to as software, firmware, middleware, microcode, hardware description language, or by any other name. , should be broadly construed to mean an application, software application, software package, routine, subroutine, object, executable, thread of execution, procedure, function, etc.

Additionally, software, instructions, information, etc. may be sent and received via a transmission medium. For example, if the software uses wired technology (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.) and/or wireless technology (infrared, microwave, etc.) to When transmitted from a server or other remote source, these wired and/or wireless technologies are included within the definition of transmission medium.

(information, signal)
The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc., which may be referred to throughout the above description, may refer to voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these. It may also be represented by a combination of

Note that terms explained in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, at least one of the channel and the symbol may be a signal. Also, the signal may be a message. Further, a component carrier (CC) may be called a carrier frequency, a cell, a frequency carrier, or the like.

("System", "Network")
As used in this disclosure, the terms "system" and "network" are used interchangeably.

(parameter, channel name)
In addition, the information, parameters, etc. described in this disclosure may be expressed using absolute values, relative values from a predetermined value, or using other corresponding information. may be expressed. For example, radio resources may be indicated by an index.

The names used for the parameters described above are not restrictive in any respect. Furthermore, the mathematical formulas etc. using these parameters may differ from those explicitly disclosed in this disclosure. Since the various channels (e.g. PUCCH, PDCCH, etc.) and information elements may be identified by any suitable designation, the various names assigned to these various channels and information elements are in no way exclusive designations. isn't it.

(Base station (wireless base station))
In this disclosure, "Base Station (BS),""wireless base station,""fixedstation,""NodeB,""eNodeB(eNB),""gNodeB(gNB),"""accesspoint","transmissionpoint","receptionpoint","transmission/receptionpoint","cell","sector","cellgroup"," The terms "carrier", "component carrier", etc. may be used interchangeably. A base station is sometimes referred to by terms such as macrocell, small cell, femtocell, and picocell.

A base station can accommodate one or more (eg, three) cells. If a base station accommodates multiple cells, the overall coverage area of the base station can be partitioned into multiple smaller areas, and each smaller area is divided into multiple subsystems (e.g., small indoor base stations (RRHs)). The term "cell" or "sector" refers to a part or all of the coverage area of a base station and/or base station subsystem that provides communication services in this coverage. refers to

(terminal)
In this disclosure, terms such as "Mobile Station (MS),""userterminal,""User Equipment (UE)," and "terminal" may be used interchangeably. .

A mobile station is defined by a person skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless It may also be referred to as a terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

(Base station/Mobile station)
At least one of a base station and a mobile station may be called a transmitting device, a receiving device, a communication device, or the like. Note that at least one of the base station and the mobile station may be a device mounted on a mobile body, the mobile body itself, or the like. The moving object may be a vehicle (for example, a car, an airplane, etc.), an unmanned moving object (for example, a drone, a self-driving car, etc.), or a robot (manned or unmanned). ). Note that at least one of the base station and the mobile station includes devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.

Furthermore, the base station in the present disclosure may be replaced by a user terminal. For example, communication between a base station and a user terminal is replaced with communication between multiple user terminals (for example, it may be called D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.). Regarding the configuration, each aspect/embodiment of the present disclosure may be applied. In this case, the terminal 20 may have the functions that the base station 10 described above has. Further, words such as "up" and "down" may be replaced with words corresponding to inter-terminal communication (for example, "side"). For example, uplink channels, downlink channels, etc. may be replaced with side channels.

Similarly, a terminal in the present disclosure may be replaced by a base station. In this case, the base station 10 may have the functions that the terminal 20 described above has.

(Meaning and interpretation of terms)
As used in this disclosure, the terms "determining" and "determining" may encompass a wide variety of operations. "Judgment" and "decision" include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, search, and inquiry. (e.g., searching in a table, database, or other data structure), and regarding an ascertaining as a "judgment" or "decision." In addition, "judgment" and "decision" refer to receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, and access. (accessing) (e.g., accessing data in memory) may include considering something as a "judgment" or "decision." In addition, "judgment" and "decision" refer to resolving, selecting, choosing, establishing, comparing, etc. as "judgment" and "decision". may be included. In other words, "judgment" and "decision" may include regarding some action as having been "judged" or "determined." Further, "judgment (decision)" may be read as "assuming", "expecting", "considering", etc.

The terms "connected", "coupled", or any variations thereof, refer to any connection or coupling, direct or indirect, between two or more elements and to each other. It may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled." The bonds or connections between elements may be physical, logical, or a combination thereof. For example, "connection" may be replaced with "access." As used in this disclosure, two elements may include one or more electrical wires, cables, and/or printed electrical connections, as well as in the radio frequency domain, as some non-limiting and non-inclusive examples. , electromagnetic energy having wavelengths in the microwave and optical (both visible and non-visible) ranges.

The reference signal can also be abbreviated as RS (Reference Signal), and may also be called a pilot depending on the applied standard.

As used in this disclosure, the phrase "based on" does not mean "based solely on" unless explicitly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

Any reference to elements using the designations "first," "second," etc. does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient way to distinguish between two or more elements. Thus, reference to a first and second element does not imply that only two elements may be employed or that the first element must precede the second element in any way.

The "unit" in the configuration of each device described above may be replaced with "means", "circuit", "device", etc.

Where "include", "including" and variations thereof are used in this disclosure, these terms, like the term "comprising," are inclusive. It is intended that Furthermore, the term "or" as used in this disclosure is not intended to be exclusive or.

A radio frame may be composed of one or more frames in the time domain.
Each frame or frames in the time domain may be called a subframe. A subframe may also be composed of one or more slots in the time domain. A subframe may have a fixed time length (eg, 1 ms) that does not depend on numerology.

Numerology may be a communication parameter applied to the transmission and/or reception of a signal or channel. Numerology includes, for example, subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration, transmission and reception. It may also indicate at least one of a specific filtering process performed by the device in the frequency domain, a specific windowing process performed by the transceiver in the time domain, etc.

A slot may be composed of one or more symbols (OFDM (Orthogonal Frequency Division Multiplexing) symbols, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbols, etc.) in the time domain. A slot may be a unit of time based on numerology.

A slot may include multiple minislots. Each minislot may be made up of one or more symbols in the time domain. Furthermore, a mini-slot may also be called a sub-slot. A minislot may be made up of fewer symbols than a slot. PDSCH (or PUSCH) transmitted in time units larger than minislots may be referred to as PDSCH (or PUSCH) mapping type A. PDSCH (or PUSCH) transmitted using minislots may be referred to as PDSCH (or PUSCH) mapping type B.

Radio frames, subframes, slots, minislots, and symbols all represent time units for transmitting signals. Other names may be used for the radio frame, subframe, slot, minislot, and symbol.

For example, one subframe may be called a Transmission Time Interval (TTI), multiple consecutive subframes may be called a TTI, and one slot or minislot may be called a TTI. You can. In other words, at least one of the subframe and TTI may be a subframe (1ms) in existing LTE, a period shorter than 1ms (for example, 1-13 symbols), or a period longer than 1ms. It may be. Note that the unit representing the TTI may be called a slot, minislot, etc. instead of a subframe.

Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in the LTE system, a base station performs scheduling to allocate radio resources (frequency bandwidth, transmission power, etc. that can be used by each user terminal) to each user terminal on a TTI basis. Note that the definition of TTI is not limited to this.

The TTI may be a transmission time unit of a channel-coded data packet (transport block), a code block, a codeword, etc., or may be a processing unit of scheduling, link adaptation, etc. Note that when a TTI is given, the time interval (for example, the number of symbols) to which transport blocks, code blocks, code words, etc. are actually mapped may be shorter than the TTI.

Note that when one slot or one minislot is called a TTI, one or more TTIs (that is, one or more slots or one or more minislots) may be the minimum time unit for scheduling. Further, the number of slots (minislot number) that constitutes the minimum time unit of the scheduling may be controlled.

A TTI having a time length of 1 ms may be called a normal TTI (TTI in LTE Rel. 8-12), normal TTI, long TTI, normal subframe, normal subframe, long subframe, slot, etc. A TTI that is shorter than a normal TTI may be referred to as an abbreviated TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, or the like.

Note that long TTI (for example, normal TTI, subframe, etc.) may be read as TTI with a time length exceeding 1 ms, and short TTI (for example, short TTI, etc.) It may also be read as a TTI having the above TTI length.

A resource block (RB) is a resource allocation unit in a time domain and a frequency domain, and may include one or more continuous subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of the numerology, and may be 12, for example. The number of subcarriers included in an RB may be determined based on numerology.

Additionally, the time domain of an RB may include one or more symbols and may be one slot, one minislot, one subframe, or one TTI long. One TTI, one subframe, etc. may each be composed of one or more resource blocks.

Note that one or more RBs include physical resource blocks (PRBs), sub-carrier groups (SCGs), resource element groups (REGs), PRB pairs, RB pairs, etc. May be called.

Further, a resource block may be configured by one or more resource elements (REs). For example, 1 RE may be a radio resource region of 1 subcarrier and 1 symbol.

Bandwidth Part (BWP) (also referred to as partial bandwidth) may refer to a subset of consecutive common resource blocks (RB) for a certain numerology in a certain carrier. good. Here, the common RB may be specified by an RB index based on a common reference point of the carrier. PRBs may be defined in a BWP and numbered within that BWP.

The BWP may include a UL BWP (UL BWP) and a DL BWP (DL BWP). One or more BWPs may be configured within one carrier for a UE.

At least one of the configured BWPs may be active and the UE may not expect to transmit or receive a given signal/channel outside of the active BWP. Note that "cell", "carrier", etc. in the present disclosure may be replaced with "BWP".

The structures of radio frames, subframes, slots, minislots, symbols, etc. described above are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of symbols included in an RB, Configurations such as the number of subcarriers, the number of symbols within a TTI, the symbol length, and the cyclic prefix (CP) length can be changed in various ways.

In this disclosure, when articles are added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are plural.

In this disclosure, the term "A and B are different" may mean "A and B are different from each other." Note that the term may also mean that "A and B are each different from C". Terms such as "separate" and "coupled" may also be interpreted similarly to "different."

(Variation of aspects, etc.)
Each aspect/embodiment described in this disclosure may be used alone, in combination, or may be switched and used in accordance with execution. In addition, notification of prescribed information (for example, notification of "X") is not limited to being done explicitly, but may also be done implicitly (for example, not notifying the prescribed information). Good too.

Although the present disclosure has been described in detail above, it is clear to those skilled in the art that the present disclosure is not limited to the embodiments described in the present disclosure. The present disclosure can be implemented as modifications and variations without departing from the spirit and scope of the present disclosure as determined by the claims. Therefore, the description of the present disclosure is for the purpose of illustrative explanation and is not intended to have any limiting meaning on the present disclosure.

One aspect of the present disclosure is useful for wireless communication systems.

10 base station 20 terminal 101, 202 transmitter 102, 201 receiver 103, 203 controller 1001 processor 1002 memory 1003 storage 1004 communication device 1005 input device 1006 output device 1007 bus

Claims (7)

An LTE (Long Term Evolution) system, and a first IoT (Internet of Things) system that has a higher priority for radio resource allocation than the LTE system and performs resource allocation at an earlier stage than the LTE system. A control unit that sets an upper limit to the amount of radio resources that can be allocated in the first IoT system among the amount of wireless resources that can be allocated in both;
a transmitter that transmits information on radio resources allocated to the first IoT system within a range that is less than or equal to the upper limit;
A base station equipped with. The control unit sets the upper limit based on the amount of radio resources estimated to be allocated to the LTE system.
The base station according to claim 1. The control unit sets the amount of radio resources estimated to be allocated to the LTE system based on measurement results of a predetermined section or parameters input from the outside.
The base station according to claim 2. The control unit allocates the amount of radio resources estimated to be allocated to the LTE system and a second IoT system having a lower priority regarding radio resource allocation than the first IoT system. setting the upper limit based on the amount of radio resources estimated to be
The base station according to claim 1. The control unit sets the total of the upper limit and the amount of radio resources estimated to be allocated to the second IoT system to be equal to or less than a predetermined value.
The base station according to claim 4. The first IoT system is an NB-IoT (Narrow band-Internet of Things) system,
The base station according to any one of claims 1 to 5. The base station is
An LTE (Long Term Evolution) system, and a first IoT (Internet of Things) system that has a higher priority for radio resource allocation than the LTE system and performs resource allocation at an earlier stage than the LTE system. setting an upper limit to the amount of radio resources that can be allocated in the first IoT system among the amount of wireless resources that can be allocated in both;
allocating wireless resources to the first IoT system within a range below the upper limit;
Wireless communication control method.

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