WO2019187308A1 - Mobile communication network and base station - Google Patents

Mobile communication network and base station Download PDF

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Publication number
WO2019187308A1
WO2019187308A1 PCT/JP2018/041778 JP2018041778W WO2019187308A1 WO 2019187308 A1 WO2019187308 A1 WO 2019187308A1 JP 2018041778 W JP2018041778 W JP 2018041778W WO 2019187308 A1 WO2019187308 A1 WO 2019187308A1
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Prior art keywords
group
grouping
mobile communication
user
communication network
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PCT/JP2018/041778
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French (fr)
Japanese (ja)
Inventor
良知 堅岡
幸一郎 北川
貴 藤本
兵選 趙
克夫 柚木
宏之 新保
Original Assignee
株式会社Kddi総合研究所
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Priority to JP2018-059936 priority Critical
Priority to JP2018059936A priority patent/JP2019176241A/en
Application filed by 株式会社Kddi総合研究所 filed Critical 株式会社Kddi総合研究所
Publication of WO2019187308A1 publication Critical patent/WO2019187308A1/en

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W4/00Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • H04W4/08User group management
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management, e.g. wireless traffic scheduling or selection or allocation of wireless resources
    • H04W72/04Wireless resource allocation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W92/00Interfaces specially adapted for wireless communication networks
    • H04W92/16Interfaces between hierarchically similar devices
    • H04W92/18Interfaces between hierarchically similar devices between terminal devices

Abstract

This mobile communication network is provided with: a grouping means for grouping multiple pieces of user equipment that are located in a cell provided by the mobile communication network and perform device to device communication into one or more groups each including at least two pieces of user equipment; a group notification means for notifying the user equipment belonging to a group of a group identifier for the group; and a resource notification means for notifying the multiple pieces of user equipment of a radio resource to be used by the device to device communication, wherein the resource notification means notifies, by multicasting, the user equipment belonging to the group of the radio resource to be used by the device to device communication.

Description

Mobile communication network and base station

The present invention relates to radio resource control for device-to-device communication of user equipment in a mobile communication network.

Communication between devices (D2D: Device to Device) in which user apparatuses (UE) of a mobile communication network directly communicate with each other without using a base station (BS) has been proposed. Non-Patent Document 1 and Non-Patent Document 2 disclose radio resource control for this D2D communication. Hereinafter, radio resource control for D2D communication disclosed in Non-Patent Document 1 and Non-Patent Document 2 will be described.

FIG. 6 shows a physical channel (downlink channel) transmitted from the BS to the UE, and FIG. 7 shows a physical channel (uplink channel) transmitted from the UE to the BS. In FIG. 6, PDCCH is a downlink control channel and is used for notifying radio resources used by the BS to the UE. In FIG. 6, PDSCH is a downlink shared channel and is used for data transmission and control information transmission to the UE. In FIG. 7, PUCCH is an uplink control channel and is used by the UE to make a radio resource allocation request to the BS. In FIG. 7, PUSCH is an uplink shared channel, and is used for transmission of data from the UE to the BS and transmission of control information.

According to Non-Patent Document 1 and Non-Patent Document 2, a control channel and a shared channel are provided as physical channels for D2D communication, similarly to the downlink and uplink. A control channel for D2D communication is referred to as a side link control channel (PSCCH: Physical Sidelink Control Channel), and a shared channel for D2D communication is referred to as a side link shared channel (PSSCH: Physical Sidelink Shared Channel). As shown in FIG. 7, a part of PUSCH is allocated to PSCCH and PSSCH. In the following description, PSCCH and PSSCH are collectively referred to as side link channels.

In an environment where a UE that performs D2D communication exists within the service provision range of the mobile communication network, the mobile communication network manages radio resources for D2D communication, that is, side link channels. According to Non-Patent Document 1 and Non-Patent Document 2, the BS notifies the UEs in the area of which area of the PUSCH to the BS is to be used as a side link channel using SIB (System Information Block) Type 18. In addition, as shown in FIG. 6, SIB Type 18 is conveyed by PDSCH. In the following description, an area notified by SIB Type 18 is referred to as a side link radio resource pool.

According to SIB Type 18, the UE recognizes the side link radio resource pool. However, regarding which region of the side link radio resource pool (which side link channel) the UE uses for D2D communication, Non-Patent Document 1 And Non-Patent Document 2 define two methods, mode 1 and mode 2. Mode 2 is a mode in which the UE autonomously selects a side link channel to be used from the side link radio resource pool. On the other hand, mode 1 is a mode in which the BS notifies each UE performing D2D communication which side link channel of the side link radio resource pool is used. This notification is carried in PDCCH DCI (Downlink Control Information) format 5 shown in FIG. Note that in DCI format 5, the radio resource position in the PUSCH used for D2D communication is not specified by the absolute position of the PUSCH, but in a relative position based on the predetermined position of the side link radio resource pool. specify. That is, in mode 1, the UE uses both the side link radio resource pool notified by SIB Type 18 and the relative position notified by DCI format 5 as the side link channel used by the own device for D2D communication. To identify.

3GPP, TS36.213, v14.4.0 3GPP, TS36.212, v15.0.0 3GPP, TS36.211, v14.5.0

In mode 1, since the mobile communication network designates the side link channel that the UE uses for D2D communication, interference in D2D communication can be suppressed. However, in mode 1, notification by DCI format 5 is performed individually for each UE that performs D2D communication, so as the number of UEs that perform D2D communication increases, radio resources used for this notification in PDCCH The amount increases. PDCCH is also used for control of communication between UE and BS, and the amount of radio resources is basically constant. Therefore, when the number of UEs that perform D2D communication increases, the amount of radio resources of PDCCH is insufficient. However, the necessary notification to the UE is not performed at an appropriate timing. Note that Non-Patent Document 3 discloses that a part of PDSCH is used as PDCCH as a countermeasure against PDCCH depletion, but the amount of PDSCH radio resources is reduced, thus affecting data transmission to UE. Effect.

According to one aspect of the present invention, a mobile communication network groups a plurality of user devices that are located in a cell provided by the mobile communication network and perform inter-device communication into one or more groups including at least two user devices. Grouping means for grouping, group notification means for notifying group devices of the group to user devices belonging to the group, resource notification means for notifying the plurality of user devices of radio resources used in the inter-device communication, The resource notification means notifies the user apparatus belonging to the group of the radio resource used in the inter-device communication by multicast.

According to the present invention, it is possible to suppress an increase in the amount of radio resources for notifying radio resources used in inter-device communication.

The block diagram of the mobile communication system by one Embodiment. FIG. 6 is a sequence diagram for side link channel notification according to an embodiment. The figure which shows the group of UE by one Embodiment. The figure which shows the cell and small cell by one Embodiment. The block diagram of the server apparatus and base station by one Embodiment. The figure which shows the physical channel of a downlink. The figure which shows the physical channel of an uplink.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the drawings. In addition, the following embodiment is an illustration and does not limit this invention to the content of embodiment. In the following drawings, components that are not necessary for the description of the embodiments are omitted from the drawings.

FIG. 1 is a configuration diagram of a mobile communication system according to the present embodiment. The mobile communication network includes a core network 2 and a BS 3. BS 3 is connected to core network 2. BS 3 provides a service to UE 4 in cell 5. The core network 2 has a server device 1. The server device 1 recognizes which UE 4 and which UE 4 perform D2D communication by prior negotiation between the UE 4 and the mobile communication network.

In the present embodiment, the server device 1 groups UEs 4 that are located in the cell 5 to which the BS 3 provides services and that perform D2D communication. In the following description, since UE4 that performs D2D communication is a processing target, UE4 that performs D2D communication is simply referred to as UE4. Although details of grouping will be described later, even if UEs 4 belonging to the same group use the same side link channel, the UEs 4 belonging to each group are selected so that the influence on the D2D communication performed by each UE 4 is reduced.

FIG. 2 is a sequence diagram of the process of assigning the side link channel to each UE 4 in the present embodiment. As described above, in S10, the server apparatus 1 groups UE4. In S11, the server apparatus 1 notifies the BS 3 of grouping information indicating the result of grouping. The grouping information is information indicating a group to which each UE 4 belongs. BS3 notifies each UE4 of the group to which it belongs in S12. For example, SIB Type 20 can be used for this notification as shown in FIG. The SIB Type 20 is for notifying the UE of G-RNTI (Group-Radio Network Temporary ID) for multicast communication. By this G-RNTI, it is possible to notify each UE 4 of the group ID (GID) to which the own device belongs.

BS 3 notifies the side link radio resource pool to each UE 4 with SIB Type 18 at S 13, and notifies the side link channel used by each group with DCI format 5 at S 14. More specifically, in normal DCI format 5, the side link channel to be used individually is notified to each UE 4. UE 4 is specified by C-RNTI (Cell-RNTI). C-RNTI is an identifier of UE4 assigned to each UE4 when connected to BS3. On the other hand, in this embodiment, the UE 4 belonging to a group is notified collectively of the side link channels used by the UE 4 belonging to the group using the same radio resource by G-RNTI. Therefore, UE4 which belongs to the same group performs D2D communication using the same side link channel. However, as described above, even if UEs 4 belonging to the same group use the same side link channel, the influence of each UE 4 belonging to each group is selected so that the influence on each D2D communication performed is reduced. small. With this configuration, it is possible to suppress the amount of PDCCH radio resources used to notify the side link channel, thereby preventing the PDCCH from being depleted.

Subsequently, grouping of UEs 4 performed by the server device 1 will be described. The squares in FIG. 3 indicate UEs 4 located in the cell 5, and G1, G2, and G3 indicate groups. That is, the rectangle denoted by G1 indicates UE4 belonging to group # 1, the rectangle denoted by G2 indicates UE4 belonging to group # 2, and the rectangle denoted by G3 indicates UE4 belonging to group # 3. Yes. In addition, the white square without a character has shown UE which does not belong to a group. That is, the grouping performed by the server device 1 does not have to make all the UEs 4 located in the cell 5 belong to any group. The grouping performed by the server device 1 in the present embodiment may be such that a part of the UEs 4 located in the cell 5 is made into one or more groups including at least two UEs 4. Note that UE 4 not belonging to a group is notified of a side link channel to be used individually using C-RNTI. Even in this case, the amount of PDCCH resources used to notify the side link channel can be suppressed. As shown in FIG. 3, the basic idea of the grouping process performed by the server device 1 is that a transmission signal for D2D communication performed by a certain UE 4 does not affect D2D communication of other UEs 4 belonging to the same group. Similarly, the distance between UEs 4 belonging to the same group is made as far as possible.

For this reason, the server apparatus 1 can use CQI (Channel Quality Indicator) that the UE 4 notifies to the mobile communication network. CQI is a value based on the received power of the reference signal that UE4 receives from BS3. Here, in general, UE4 close to BS3 has a high reception power of the reference signal, and UE4 far from BS3 has a low reception power of the reference signal. Therefore, it can be considered that a large difference in CQI between the two UEs 4 indicates that the distance between the two UEs 4 is long. Therefore, grouping can be performed such that the difference between the CQIs of any two UEs 4 in the same group is equal to or greater than a predetermined value.

Also, the server device 1 can use the location information of the UE 4 to the small base station (SBS) in the cell 5 for grouping. As shown in FIG. 4, a plurality of SBSs may be provided in the cell 5 provided by the BS 3. In FIG. 4, four SBSs are provided, and small cells 51, 52, 53, and 54 are provided by each SBS. Since the UE 4 communicating with the SBS is located in the small cell provided by the SBS and the coverage of the SBS is very short, the UE 4 communicating with the SBS is located in the vicinity of the SBS. Can be determined. For example, assuming that the shortest distance between any two small cells of the small cells 51, 52, 53, and 54 in FIG. 6 is so far as not to affect the D2D communication, the small cells 51, 52, 53, and 54 are separated. Four UEs located in the can be grouped into one group.

Furthermore, the server apparatus 1 can also acquire the location information acquired by each UE 4 by GPS or the like from each UE 4 and perform grouping based on the location information. Further, when the rough position of the UE 4 can be determined based on the strength and direction of the signal received by the BS 3 from the UE 4, the position information of the UE 4 determined by the BS 3 can be used for grouping.

In FIG. 1, only one BS 3 and one server device 1 are shown, but there are a plurality of BSs 3 in the communication network, and the server device 1 performs the above-described grouping for each of the plurality of BSs 3. The grouping information can be notified to each BS 3. A plurality of server devices 1 may be provided, and each server device 1 may be configured to perform grouping processing on one or more predetermined BSs 3. Furthermore, one BS 3 and one server device 1 can be made to correspond one-to-one. In this case, the function of the server device 1 described above can be incorporated into the BS 3. Furthermore, the function of the server device 1 can be incorporated on the same computer as other functions of the core network 2.

FIG. 5 is a configuration diagram of the server device 1 and the BS 3. The grouping unit 11 of the server device 1 groups UEs 4 located in the cell 5 provided by the BS 3. Here, as described above, the grouping unit 11 performs grouping based on the position related information related to the position of each UE 4. The location-related information can be, for example, the latitude and longitude that the UE 4 acquires by GPS and notifies the server device 1 via the BS 3. Moreover, it can be set as the position which BS3 determined from the signal strength and direction which are received from UE4. Moreover, it can be set as CQI which each UE4 notifies to BS3. Furthermore, it can be set as the location information of UE4 to the small cell in the cell which BS3 provides. The grouping unit 11 is configured so that necessary position related information can be acquired from each functional block of the mobile communication network. The notification unit 12 notifies the BS 3 of the grouping result by the grouping unit 11.

When the communication unit 34 of the BS 3 receives the grouping result from the server device 1, the communication unit 34 outputs the result to the resource allocation unit 32. The resource allocation unit 32 first allocates a group identifier (GID) to the group based on the result of the grouping. Then, the notification unit 32 notifies each UE 4 of the group identifier via the wireless communication unit 31. For example, SIB Type 20 can be used for this notification. Moreover, the resource allocation part 33 allocates a side link channel separately to UE4 which does not belong to a group for UE4 which belongs to a group by a group. And the notification part 32 notifies each UE4 of the allocation result of the side link channel via the radio | wireless communication part 31. FIG. Here, the UE 4 belonging to the group is notified of the side link channel used by the UE 4 belonging to the group by multicast using GID. On the other hand, for the UE 4 that does not belong to the group, for example, the identifier of the UE 4 is used to notify the side link channel used by the UE 4 by unicast.

In addition, when incorporating the server apparatus 1 in BS3, the grouping part 11 is provided in BS3.

The server device 1 according to the present invention can be realized by a program that, when executed by one or more processors of a computer, causes the computer to operate as the server device 1 described above. Similarly, the BS 3 according to the present invention can be realized by a program that, when executed by one or more processors of the BS 3, causes the BS 3 to function as the BS 3 described above. These computer programs can be stored in a computer-readable storage medium or distributed via a network.

The present invention is not limited to the above embodiment, and various changes and modifications can be made without departing from the spirit and scope of the present invention. Therefore, in order to make the scope of the present invention public, the following claims are attached.

This application claims priority on the basis of Japanese Patent Application No. 2018-59936 filed on Mar. 27, 2018, the entire contents of which are incorporated herein by reference.

Claims (7)

  1. Grouping means for grouping a plurality of user devices that are located in a cell provided by a mobile communication network and perform communication between devices into one or more groups including at least two user devices;
    Group notification means for notifying the user device belonging to the group of the group identifier of the group;
    Resource notification means for notifying the plurality of user apparatuses of radio resources used in the inter-device communication;
    With
    The mobile communication network according to claim 1, wherein the resource notification unit notifies a user apparatus belonging to a group of a radio resource used in the inter-device communication by multicast.
  2. The mobile communication network according to claim 1, wherein the resource notification means notifies a user apparatus that does not belong to a group of a radio resource used for inter-device communication by unicast.
  3. The mobile communication network according to claim 1 or 2, wherein the grouping means performs the grouping based on position-related information related to positions of the plurality of user devices.
  4. The mobile communication network according to claim 3, wherein the position related information of the plurality of user devices includes a value based on a reception power of a reference signal received by the plurality of user devices from the mobile communication network.
  5. The location related information of the plurality of user apparatuses includes location information of the plurality of user apparatuses to a small cell provided by a small base station installed in the cell. The mobile communication network described.
  6. A mobile communication network having a base station and a server device,
    The server device
    Grouping means for grouping a plurality of user apparatuses that are located in a cell provided by the base station and perform inter-device communication into one or more groups including at least two user apparatuses;
    A result notifying means for notifying the base station of the result of grouping by the grouping means;
    With
    The base station
    In accordance with the result of grouping notified from the result notification means, group notification means for notifying the user apparatus belonging to the group of the group identifier of the group,
    Resource notification means for notifying the plurality of user apparatuses of radio resources used in the inter-device communication;
    With
    The mobile communication network according to claim 1, wherein the resource notification unit notifies a user apparatus belonging to a group of a radio resource used in the inter-device communication by multicast.
  7. A mobile communication network base station,
    Grouping means for grouping a plurality of user apparatuses that are located in a cell provided by the base station and perform inter-device communication into one or more groups including at least two user apparatuses;
    Group notification means for notifying the user device belonging to the group of the group identifier of the group;
    Resource notification means for notifying the plurality of user apparatuses of radio resources used in the inter-device communication;
    With
    The base station according to claim 1, wherein the resource notification means notifies the user apparatus belonging to the group of a radio resource used in the inter-device communication by multicast.
PCT/JP2018/041778 2018-03-27 2018-11-12 Mobile communication network and base station WO2019187308A1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014017476A1 (en) * 2012-07-27 2014-01-30 京セラ株式会社 Mobile communication system, base station, user device and processor
JP2015503259A (en) * 2011-10-24 2015-01-29 エルジー エレクトロニクス インコーポレイティド A method in which a base station supports D2D (Device-to-Device) communication and a method in which a D2D terminal efficiently transmits a D2D communication request signal in a wireless communication system
JP2015073258A (en) * 2013-09-06 2015-04-16 株式会社Nttドコモ User device, base station, information notification method and resource allocation method
WO2016056152A1 (en) * 2014-10-07 2016-04-14 日本電気株式会社 Control device and method for inter-terminal direct communication
JP2016541201A (en) * 2013-12-20 2016-12-28 京セラ株式会社 Management of communication resources between devices

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015503259A (en) * 2011-10-24 2015-01-29 エルジー エレクトロニクス インコーポレイティド A method in which a base station supports D2D (Device-to-Device) communication and a method in which a D2D terminal efficiently transmits a D2D communication request signal in a wireless communication system
WO2014017476A1 (en) * 2012-07-27 2014-01-30 京セラ株式会社 Mobile communication system, base station, user device and processor
JP2015073258A (en) * 2013-09-06 2015-04-16 株式会社Nttドコモ User device, base station, information notification method and resource allocation method
JP2016541201A (en) * 2013-12-20 2016-12-28 京セラ株式会社 Management of communication resources between devices
WO2016056152A1 (en) * 2014-10-07 2016-04-14 日本電気株式会社 Control device and method for inter-terminal direct communication

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