Base station device, terminal device, and wireless communication system

Abstract

This base station device comprises: a reception unit that receives, from a terminal device, reception capability information relating to bands to be collectively received by the terminal device; and a control unit that, if the collective reception of the terminal device is not permitted, determines that a secondary cell is not added when it has been determined from the reception capability information that the terminal device performs the collective reception if the secondary cell is added.

Description

Base station device, terminal device, and wireless communication system

[0001] The present invention relates to a base station device, a terminal device, and a wireless communication system.

[0002] In today's networks, traffic from mobile devices (smartphones and feature phones) accounts for the majority of network resources, and the traffic used by mobile devices is expected to continue to expand in the future.

[0003] In addition to traffic used by mobile terminals, for example, IoT (Internet of things) services (for example, monitoring systems for transportation systems, smart meters, devices, etc.) are being deployed. Therefore, networks are required to support services with diverse requirements. In order to support such diverse services, for example, in communication standards for fifth-generation mobile communications (5G or NR (New Radio)) (for example, Non-Patent Documents 1 to 11), standards are being developed assuming support for many use cases classified as eMBB (Enhanced Mobile Broadband), Massive MTC (Machine Type Communications), and URLLC (Ultra-Reliable and Low Latency Communications).

[0004] In wireless communication systems, there is a carrier aggregation (CA) technology that increases communication speeds by bundling multiple communication bands (CC: Component Carrier).When performing CA, a technology called fragmented carrier is being considered, which collectively receives communication bands with different frequencies using a single receiving device (Rx chain) (Non-Patent Document 12).

[0005] 3GPP TS 37.324 V18.0.03GPP TS 38.211 V18.3.03GPP TS 38.212 V18.3.03GPP TS 38.213 V18.3.03GPP TS 38.214 V18.3.03GPP TS 38.215 V18.3.03GPP TS 38.300 V18.2.03GPP TS 38.321 V18.2.03GPP TS 38.322 V18.1.03GPP TS 38.323 V18.2.03GPP TS 38.331 V18.2.0R4-2402309

[0006] However, for example, by applying a fragment carrier, a wide communication band is received by a single receiving device, which may result in reduced interference resistance. When a terminal device receives signals using multiple bands (frequency bands), the base station device cannot know whether to apply multiple receiving devices for individual reception, to apply a fragment carrier for collective reception, or to perform both. For example, when adding a secondary cell (SCell), the base station device may not want the terminal device to apply a fragment carrier (collective reception) in order to prevent a reduction in interference resistance.

[0007] Therefore, one disclosure provides a base station device, a terminal device, and a wireless communication system that can control whether or not batch reception is performed in the terminal device.

[0008] The device has a receiving unit that receives, from a terminal device, reception capability information regarding bands that the terminal device will receive in bulk, and a control unit that, when bulk reception of the terminal device is not permitted and it is determined from the reception capability information that adding a secondary cell will cause the terminal device to receive in bulk, decides not to add the secondary cell.

[0009] One disclosure can control whether or not batch reception is performed in a terminal device.

[0010] FIG. 1 is a diagram showing an example of the configuration of a wireless communication system 10. FIG. 2 is a diagram showing an example of the configuration of a base station device 200. FIG. 3 is a diagram showing an example of the configuration of a terminal device 100. FIG. 4 is a diagram showing an example of the configuration of a receiver 151. FIG. 5 is a diagram showing an example of a process when carrier aggregation is performed using only individual reception. FIG. 6 is a diagram showing an example of a process when carrier aggregation is performed including collective reception. FIG. 7 is a diagram showing an example of the sequence of an SCell addition determination process. FIG. 8 is a diagram showing an example of the receiving capability of the terminal device 100. FIG. 9 is a diagram showing an example of the receiving capability of the terminal device 100. FIG. 10 is a diagram showing an example of the receiving capability of the terminal device 100.

[0011] The present embodiment will be described in detail below with reference to the drawings. The problems and examples in this specification are merely examples and do not limit the scope of the rights of the present application. In particular, even if the expressions used are different, the technology of the present application can be applied as long as they are technically equivalent, and do not limit the scope of the rights. Furthermore, each embodiment can be combined as appropriate within the scope of not causing any contradiction in the processing content.

[0012] Furthermore, the terms used and technical contents described in this specification may be those described in specifications and contributions as standards related to communication, such as 3GPP (3rd Generation Partnership Project (registered trademark)). Examples of such specifications include those described in Non-Patent Documents 1 to 11.

[0013] Hereinafter, embodiments of a base station, a terminal, a wireless communication system, and a communication method disclosed in the present application will be described in detail with reference to the accompanying drawings. Note that the disclosed technology is not limited to the following embodiments.

[0014] [First Embodiment] A first embodiment will be described.

[0015] 1 is a diagram showing an example of the configuration of a wireless communication system 10. The wireless communication system 10 includes a base station device 200 and a terminal device 100.

[0016] The base station device 200 is a device that is wirelessly connected to and performs wireless communication with the terminal device 100, and is, for example, an eNodeB or a gNodeB. The base station device 200 forms a communication area A200 in which wireless communication is possible.

[0017] The terminal device 100 is a communication device, such as a smartphone or a tablet terminal, that wirelessly connects to the base station device 200 and transmits and receives data. When receiving a signal from the base station device 200, the terminal device 100 supports CA and batch reception.

[0018] 2 is a diagram showing an example of the configuration of the base station device 200. The base station device 200 includes a CPU (Central Processing Unit) 210, a storage 220, a memory 230, an antenna 240, and a wireless communication circuit 250.

[0019] The storage 220 is an auxiliary storage device that stores programs and data, such as a flash memory, a hard disk drive (HDD), or a solid state drive (SSD). The storage 220 stores a wireless communication control program 221 and an SCell addition determination program 222.

[0020] The memory 230 is an area into which the programs stored in the storage 220 are loaded. The memory 230 may also be used as an area in which the programs store data.

[0021] The wireless communication circuit 250 is a device that performs wireless communication with the terminal device 100 via the antenna 240. The base station device 200 transmits and receives signals (messages) to and from the terminal device 100 via the wireless communication circuit 250.

[0022] The CPU 210 is a processor that loads programs stored in the storage 220 into the memory 230, executes the loaded programs, configures each unit, and realizes each process.

[0023] The CPU 210 executes the wireless communication control program 221 to configure a control unit, a transmission unit, and a reception unit, and to perform wireless communication control processing. The wireless communication control processing is processing for controlling wireless communication with the terminal device 100. In the wireless communication control processing, the base station device 200 wirelessly connects to the terminal device 100, transmits signals to the terminal device 100, and receives signals from the terminal device 100.

[0024] The CPU 210 executes the SCell addition determination program 222 to configure a control unit, a transmission unit, and a reception unit, and perform SCell addition determination processing. The SCell addition determination processing is processing for determining whether to add an SCell in order to increase the band (frequency band) used by the terminal device 100. When adding an SCell, the SCell addition determination processing includes processing for notifying the terminal device of information about the SCell to be added. Note that the band indicates a frequency band of a predetermined width, and may be interpreted as, for example, a unit of radio resources or a resource block.

[0025] 3 is a diagram illustrating an example of the configuration of the terminal device 100. The terminal device 100 includes a CPU 110, a storage 120, a memory 130, an antenna 140, and a wireless communication circuit 150.

[0026] The storage 120 is an auxiliary storage device such as a flash memory, HDD, or SSD that stores programs and data. The storage 120 stores a wireless communication program 121 and a capability notification program 122.

[0027] The memory 130 is an area into which the programs stored in the storage 120 are loaded. The memory 130 may also be used as an area in which the programs store data.

[0028] The wireless communication circuit 150 is a device that performs wireless communication with the base station device 200 via the antenna 140. The terminal device 100 transmits and receives signals (messages) to and from the base station device 200 via the wireless communication circuit 150. The wireless communication circuit also has a receiver 151 (not shown). There may be multiple receivers 151. Details of the receiver 151 will be described later.

[0029] The CPU 110 executes the wireless communication program 121 to configure a terminal control unit, a terminal transmission unit, and a terminal reception unit, and to perform wireless communication processing. The wireless communication processing is processing for establishing a wireless connection with the base station device 200 and performing wireless communication. In the wireless communication processing, the terminal device 100 performs wireless communication with the base station device 200, receives signals transmitted by the base station device 200, and transmits signals to the base station device 200.

[0030] The CPU 110 executes the capability notification program 122 to configure a terminal control unit, a terminal transmission unit, and a terminal reception unit, and to perform capability notification processing. The capability notification processing is processing to notify the base station device 200 of terminal information related to the processing capabilities and supported functions of the terminal device 100. The terminal information includes information related to the application of fragment carriers, such as whether or not to perform collective reception when receiving signals of each band.

[0031] <Configuration Example of Receiver 151> The receiver 151 is a device that receives a signal and converts it into a digital signal. Fig. 4 is a diagram showing a configuration example of the receiver 151.

[0032] The receiver 151 includes a filter 1511 , an amplifier 1512 , a mixer 1513 , and an analog-to-digital converter 1514 .

[0033] When the antenna 140 is a shared antenna that performs both transmission and reception, the filter 1511 electrically separates the received signal into a transmission path and a reception path. The filter 1511 outputs the received signal, for example.

[0034] The amplifier 1512 is a device that amplifies the power of an input signal and outputs the amplified signal. The amplifier 1512 is, for example, a carrier amplifier, a peak amplifier, or a Doherty amplifier.

[0035] The mixer 1513 is a device that mixes input signals and is, for example, an analog mixer.

[0036] The analog-to-digital converter 1514 is a device that converts an input analog signal into a digital signal and outputs it.

[0037] <Signal Reception Processing> Processing during signal reception will be described below. Below, a case where carrier aggregation is performed with individual reception (receiving one band with one receiver) and a case where carrier aggregation is performed including batch reception will be described.

[0038] 5 is a diagram showing an example of processing when carrier aggregation is performed only with individual reception. Note that, hereinafter, band 1 (Band #1), band 2 (Band #2), and band 3 (Band #3) are different frequency bands, and may be either continuous or discontinuous frequencies. Also, the terminal device 100 has two receivers, a receiver 151-1 and a receiver 151-2.

[0039] For example, the terminal device 100 individually receives band 1 with receiver 151-1 and individually receives band 2 with receiver 151-2. Then, the terminal device 100 performs carrier aggregation using the individually received bands 1 and 2. In this case, since there are only two receivers, band 3 cannot be used.

[0040] FIG. 6 is a diagram showing an example of processing when carrier aggregation is performed, including batch reception.

[0041] For example, the terminal device 100 collectively receives band 1 and band 2 using a receiver 151-1, and individually receives band 3 using a receiver 151-2. Then, the terminal device 100 performs carrier aggregation using the individually received bands 1, 2, and 3.

[0042] A comparison is made between cases where batch reception is included and cases where batch reception is not included. When batch reception is included, the communication bandwidth is wider by the bandwidth of band 3 than when batch reception is included, and the communication speed is faster. However, when batch reception is included, the bandwidth processed by receiver 151-1 is wider than when batch reception is included, and therefore interference resistance is weaker.

[0043] For example, if the base station device 200 does not want to weaken interference resistance, it controls the terminal device not to perform batch reception.

[0044] <SCell addition determination process> The SCell addition determination process will be described below. Hereinafter, the process will be described for each difference in the configuration of the receiver of the terminal device 100 (hereinafter, may be referred to as reception capability).

[0045] <Sequence> Fig. 7 is a diagram showing an example of the sequence of the SCell addition determination process. Even if there is a difference in the configuration of the receiver of the terminal device 100, the basic sequence is the same. Note that Fig. 7 shows the sequence when adding an SCell, and if an SCell is not added, an SCell addition notification may not be transmitted.

[0046] The base station device 200 transmits a capability notification request to the terminal device 100 at a predetermined timing (S10). The capability notification request is, for example, a UECapabilityEnquiry. The base station device 200 requests the terminal device 100 to notify the terminal device 100 of terminal information including the reception capabilities of the terminal device 100.

[0047] When the terminal device 100 receives the capability notification request (S10), the terminal device 100 transmits a capability notification including terminal information to the base station device 200 (S11). The capability notification is, for example, UECapabilityInformation. The terminal information includes information related to reception capabilities.

[0048] When the base station device 200 receives the capability notification (S11), the base station device 200 executes an SCell addition determination process S12 for determining whether to add an SCell based on terminal information. The SCell addition determination process S12 is a process for determining whether to add an SCell based on information such as whether batch reception is permitted and whether batch reception will be performed when the terminal device 100 adds an SCell.

[0049] When adding an SCell, the base station device 200 transmits an SCell addition notification to the terminal device 100 (S13). The SCell addition notification is, for example, RRCReconfiguration. The SCell addition notification includes information about the SCell to be added.

[0050] The following description will be given for each reception capability of the terminal device 100. Note that the description will be given taking as an example a case where the base station device 200 determines whether to add band 3 to the SCell when communicating with the terminal device 100 using bands 1 and 2.

[0051] <1. Reception capability 1> Fig. 8 is a diagram showing an example of the reception capability of the terminal device 100. Table 1 is a table showing whether individual reception or batch reception is performed when the terminal device 100 performs CA in multiple bands. From Table 1, when performing CA in bands 1 and 2 (pattern 1), the terminal device 100 performs only individual reception. Furthermore, when performing CA in bands 2 and 3 (pattern 2), the terminal device 100 performs only individual reception. Furthermore, when performing CA in bands 1 and 3 (pattern 3), the terminal device 100 performs only individual reception. On the other hand, when performing CA in bands 1, 2, and 3 (pattern 4), the terminal device 100 performs batch reception. Note that in the case of pattern 4, the terminal device 100, for example, performs batch reception of bands 1 and 2 and individual reception of band 3.

[0052] The terminal device 100 transmits a capability notification including, in the terminal information, a notification that the terminal device 100 will perform batch reception when performing CA in bands 1, 2, and 3 (S11 in FIG. 7). The terminal information includes, for example, a combination of bands (bands 1, 2, and 3) in which batch reception will be performed.

[0053] Upon receiving the capability notification, the base station device 200 performs an SCell addition determination process (S12 in FIG. 7 ). The base station device 200 recognizes that if the terminal device 100 performs CA in bands 1, 2, and 3, batch reception will be performed. If CA in batch reception is not permitted, the base station device 200 determines not to add an SCell because adding band 3 will cause the terminal device 100 to perform batch reception. In this case, the base station device 200 does not transmit an SCell addition notification.

[0054] Furthermore, if CA in batch reception is permitted, the base station apparatus 200 determines to add an SCell.

[0055] Whether or not to allow batch reception is a setting determined, for example, by the wireless communication system 10. The base station device 200 stores in advance in memory whether or not batch reception is allowed. Alternatively, for example, the base station device 200 may be notified by a higher-level device of whether or not batch reception is allowed.

[0056] <2. Reception capability 2> Fig. 9 is a diagram showing an example of the reception capability of the terminal device 100. Table 2 is a table showing whether individual reception or batch reception is performed when the terminal device 100 performs CA in multiple bands. From Table 2, when the terminal device 100 performs CA in pattern 1, it performs only individual reception. Furthermore, when the terminal device 100 performs CA in pattern 2, it performs only individual reception. Furthermore, when the terminal device 100 performs CA in pattern 3, it performs only individual reception. On the other hand, when the terminal device 100 performs CA in pattern 4, it may perform both reception including batch reception or only individual reception (it supports both).

[0057] The terminal device 100 transmits a capability notification including, in the terminal information, that it may perform bulk reception (or that it supports bulk reception) when performing CA in bands 1, 2, and 3 (S11 in FIG. 7). "May" indicates that bulk reception may not necessarily be performed, and whether bulk reception is included or only individual reception is performed is a matter to be decided by the terminal device 100. The terminal information includes, for example, a combination of bands (bands 1, 2, and 3) for which bulk reception is possible, and that bulk reception may be performed (bulk reception is not necessarily performed, but may be performed in some cases).

[0058] Upon receiving the capability notification, the base station device 200 performs an SCell addition determination process (S12 in FIG. 7 ). The base station device 200 recognizes that if the terminal device 100 performs CA in bands 1, 2, and 3, there is a possibility that batch reception will be performed.

[0059] The base station device 200 adds the SCell, but determines not to cause the terminal device 100 to perform CA with batch reception.

[0060] The base station device 200 includes information about the SCell to be added and an instruction not to perform batch reception in an SCell addition notification, and transmits the SCell addition notification to the terminal device 100 (S13 in FIG. 7).

[0061] When the terminal device 100 receives the SCell addition notification, it uses band 3 of the added SCell and performs communication using CA without performing collective reception (only individual reception).

[0062] <3. Reception capability 3> Fig. 10 is a diagram showing an example of the reception capability of the terminal device 100. Table 3 is a table showing whether individual reception or batch reception is performed when the terminal device 100 performs CA in multiple bands. From Table 2, when the terminal device 100 performs CA in pattern 1, it performs only individual reception. Furthermore, when the terminal device 100 performs CA in pattern 2, it performs only individual reception. Furthermore, when the terminal device 100 performs CA in pattern 3, it performs only individual reception. On the other hand, when the terminal device 100 performs CA in pattern 4, it performs batch reception, but there is a limit to the frequency bandwidth in which batch reception can be performed.

[0063] The terminal device 100 transmits a capability notification including, in the terminal information, information on the frequency bandwidth in which bulk reception is possible and information on the performance of bulk reception when the terminal device 100 performs CA in bands 1, 2, and 3 (S11 in FIG. 7). The terminal information includes, for example, the combination of bands in which bulk reception is performed (bands 1, 2, and 3) and the communication bandwidth.

[0064] When receiving the capability notification, the base station device 200 performs an SCell addition determination process (S12 in FIG. 7). The base station device 200 recognizes that if the terminal device 100 performs CA in bands 1, 2, and 3, batch reception will be performed.

[0065] If CA in batch reception is not permitted, the base station device 200 determines not to add an SCell because adding band 3 causes the terminal device 100 to perform batch reception. In this case, the base station device 200 does not transmit an SCell addition notification.

[0066] On the other hand, when CA in batch reception is permitted, the base station device 200 checks whether the communication bandwidth does not exceed the allowable range even if band 3 is added. If the communication bandwidth is within the allowable range for batch reception even if band 3 is added, the base station device 200 determines to add an SCell.

[0067] In addition, in order to notify the base station device 200 of more detailed information regarding bulk reception, for example, when bulk reception is performed in CA of three or more bands, the terminal device 100 may notify information regarding a combination of bands that are the target of bulk reception (for example, bulk reception is performed in bands 1 and 2, or any combination of two of bands 1 to 3 is bulk reception, etc.). This allows the base station device 200 to verify, for example, whether the communication bandwidth is within an allowable range for all combinations that may be used for bulk reception.

[0068] Furthermore, if adding band 3 would exceed the allowable range of communication bandwidth for batch reception, the base station device 200 determines not to add an SCell.

[0069] Other Embodiments In addition to the above-described communication bandwidth, batch reception in the terminal device 100 may be subject to restrictions on the frequency of the communication band, for example. For example, the restriction is based on the frequency value, such that batch reception is possible (or impossible) when the frequency is equal to or greater than a predetermined value. Therefore, the value of the frequency at which batch reception is possible (for example, equal to or greater than a predetermined value, equal to or less than a predetermined value, or a range) may be notified to the base station device 200 in the capability notification.

[0070] 10: Wireless communication system 100: Terminal device 110: CPU 120: Storage 121: Wireless communication program 122: Capability notification program 130: Memory 140: Antenna 150: Wireless communication circuit 200: Base station device 210: CPU 220: Storage 221: Wireless communication control program 222: SCell addition determination program 230: Memory 240: Antenna 250: Wireless communication circuit 151: Receiver 1511: Duplexer 1512: Amplifier 1513: Mixer 1514: Analog-to-digital converter

Claims

1. A base station device having a receiving unit that receives, from a terminal device, reception capability information regarding bands that the terminal device will receive in bulk, and a control unit that, when bulk reception of the terminal device is not permitted, determines from the reception capability information that adding a secondary cell will cause the terminal device to receive in bulk, and decides not to add the secondary cell.

2. The base station device according to claim 1, wherein the control unit decides to add the secondary cell when it determines from the reception capability information that the terminal device will not perform bulk reception even if the secondary cell is added.

3. The base station device of claim 1, wherein the reception capability information includes information regarding a combination of bands that the terminal device may perform bulk reception, and when the control unit determines from the reception capability information that adding the secondary cell may cause the terminal device to perform bulk reception if bulk reception of the terminal device is not permitted, the control unit decides not to add the secondary cell or to add the secondary cell, and when it decides to add the secondary cell, notifies the terminal device not to perform bulk reception.

4. The base station device of claim 1, wherein the reception capability information includes information regarding the bandwidth limit of the band for the bulk reception, and when the control unit determines from the reception capability information that the bandwidth limit will be satisfied even if the secondary cell is added, if bulk reception of the terminal device is permitted, the control unit decides to add the secondary cell.

5. A terminal device having a terminal transmitting unit that transmits reception capability information regarding bands that the terminal device will receive in bulk to a base station device, and a terminal control unit that, when the base station device does not allow the terminal device to receive in bulk, notifies the receiving capability information when the terminal device to which a secondary cell is to be added performs bulk reception, thereby controlling the terminal device to decide not to add the secondary cell.

6. A wireless communication system having a terminal device and a base station device, wherein the terminal device transmits reception capability information regarding the bands that the terminal device will receive in bulk to the base station device, and the base station device receives the reception capability information, and if bulk reception is not permitted for the terminal device, determines from the reception capability information that adding a secondary cell will cause the terminal device to receive in bulk, and then decides not to add the secondary cell.

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