JP2015181286A - allocation of resources - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control communication by a communication apparatus in a service area.SOLUTION: Resources are allocated for concurrent communication via a plurality of antennas in a service area, and information on the allocated resources is transmitted to a communication apparatus via a plurality of control channels. The communication apparatus can receive the plurality of control channels to concurrently communicate via the plurality of antennas based on the information.

Description

  The present disclosure relates to allocation of resources for wireless communication.

  A communication system may facilitate communication between two or more entities, such as mobile communication devices and other stations. Typically, communication systems and compatible communication devices operate according to a given standard or specification that indicates what the various entities associated with the system can do and how to achieve it. For example, it typically defines how a communication device can access the communication system and how communication should be performed between the communication device, elements of the communication network and / or other communication devices. .

  In a wireless communication system, at least a part of communication between at least two stations is performed via a wireless link. Thus, typically in a wireless system, a communication device provides a transceiver station that can communicate with an access node and / or another communication device. Examples of wireless systems include public land mobile networks (PLMNs), satellite communication systems, and various wireless local networks such as wireless local area networks (WLANs). In a wireless system, a base station provides an access node. The radio coverage area of a base station is known as a cell, and thus the radio system is often referred to as a cellular system. In some systems, the base station access node is called NodeB.

  The communication system can be accessed via a suitable communication device. A user's communication device is often referred to as a user equipment (UE). The communication device has an appropriate signal transmission / reception configuration for enabling communication with another party. A feature of wireless communication devices is that they provide mobility to the user. Mobile communication devices, or mobile devices for short, can also be transitioned or handed over from one base station to another, and even between base stations belonging to different systems.

  Transmit diversity has been proposed to increase performance. For example, a single antenna port mode using transmission diversity has been proposed. Another method involves the use of a multiple input multiple output (MIMO) multi-antenna configuration. LTE release 8 proposes downlink (DL) MIMO, and LTE release 10 proposes uplink (UL) MIMO. In this proposal, multiple transmission blocks (TB) can be carried on the same resource. However, it is impossible to assign different resources to a plurality of transmission blocks, and thus the scheduling flexibility that a multi-antenna station can provide is extremely limited. Two directional antennas from two antenna sites can also be placed facing each other so that they are considered a single cell. One transmit antenna can support one transport block and map to the same frequency resource. However, when directional antennas are used, the channel quality of the two links is significantly different, so the gain of the transmit diversity mode is not as high as, for example, a multiple-input multiple-output (MIMO) multi-antenna configuration.

  Embodiments of the present invention are intended to address one or several of these issues.

  According to an embodiment, a method for controlling communication by a communication device is provided, the method comprising: assigning resource information for communication via multiple antennas in a service area assigned to the communication device; Receiving on the control channel, and communicating simultaneously via the plurality of antennas based on this information.

  According to an embodiment, a method for allocating resources within a service area of a communication system is provided, the method comprising allocating resources for simultaneous communication via a plurality of antennas within a service area to a communication device; Transmitting the allocated resource information to the communication device via a plurality of control channels.

  According to an embodiment, there is provided an apparatus for controlling resource use by a communication device in a service area, the apparatus comprising at least one processor and at least one memory including computer program code, At least one memory and computer program code, using at least one processor, monitoring a plurality of control channels to receive information of resources allocated for communication via a plurality of antennas in a service area; Based on this information, simultaneous communication is performed via a plurality of antennas.

  According to an embodiment, there is provided an apparatus for controlling resource use by a communication device in a service area, the apparatus comprising at least one processor and at least one memory including computer program code, At least one memory and computer program code use at least one processor to allocate resources for simultaneous communication via a plurality of antennas in a service area to a communication device, and information on the allocated resources includes a plurality of information. It is configured to be transmitted to the communication device via the control channel.

  According to a more detailed embodiment, the information includes a resource grant that allocates a transport block. Multiple resource grants can be signaled within one subframe.

  Resources can be allocated individually for communication via each of the antennas. Different resources can be assigned to transport blocks associated with different antennas.

  Simultaneous communication can include communication on a single carrier.

  Control channels can be associated with antenna ports and transport blocks. The reference signal can be mapped to the antenna ports of a plurality of antennas. The reference signal channel can be mapped to a shared physical channel.

  Information of at least one of the transmitted transport block, codeword, rank and antenna port may be communicated in the downlink control information element. Information about the allocated resources can be signaled on the physical downlink control channel.

  An offset can be used during the search space associated with the control channel.

  The plurality of antennas may include cell directional antennas.

  The communication device can move with respect to a plurality of antennas.

  The communication device can be configured to have a transmission mode that allows the use of multiple control channels and antennas.

  A computer program comprising program code means adapted to perform the methods described herein may also be provided. According to further embodiments, an apparatus for providing at least one of the above methods and / or a program product that can be embodied on a computer readable medium are provided.

  Various other aspects and additional embodiments are described in the following detailed description and appended claims.

  For a better understanding of some embodiments of the invention, reference will now be made by way of example only to the accompanying drawings in which:

It is a figure which shows the reference signal mapping of the backhaul scenario where one antenna port from each direction exists. It is a figure which shows the example of a communication apparatus. It is a figure which shows the example of the controller apparatus of a base station. 3 is a flowchart illustrating an embodiment. It is a figure which shows the reference signal mapping of the backhaul scenario where multiple antenna ports from each direction exist.

  Certain exemplary embodiments are described below with reference to a wireless or mobile communication system serving a mobile communication device. Therefore, before describing exemplary embodiments in detail, some general principles of wireless communication systems and mobile communication devices will be briefly described to help understand the technology underlying the described examples. .

  A non-limiting example of a communication system is Long Term Evolution (LTE) of Universal Mobile Telecommunications System (UMTS), which is in the stage of standardization by the Third Generation Partnership Project (3GPP). A further development of LTE is called LTE-Advanced. In terms of 3GPP specifications, LTE base stations are known as NodeB (NB). LTE-based systems can utilize a mobile architecture known as Evolved Universal Terrestrial Radio Access Network (E-UTRAN). The base station of such a system is known as evolved NodeB (eNB), which is user plane radio link control / medium access control / physical layer protocol (RLC / MAC / PHY) and control plane radio resource control ( E-UTRAN functions such as termination towards user equipment of the RRC) protocol can be provided. Other examples of wireless services are those provided by system base stations based on technologies such as wireless local area network (WLAN) and / or WiMax (Worldwide Interoperability for Microwave Access) Is mentioned.

  Regardless of the underlying standard, mobile communication devices can be provided with wireless access via at least one base station or similar wireless transceiver node of the access system.

  The access system can be provided by a cell of a cellular system or another wireless service area that allows communication equipment to access the communication system. Therefore, hereinafter, the access system is referred to as a wireless service area or cell. Usually, a base station site provides a cell. A base station site may provide multiple sectors, for example, three radio sectors each providing a cell or a lower radio service area of a cell.

  As shown in the example of FIG. 1, a plurality of antenna sites 1 and 2 connected to a controller 30 can provide a cell 10. In the example of FIG. 1, antenna sites 1 and 2 each realize a directional antenna that forms beams 6 and 7. As shown, the directional beams 6 and 7 can overlap each other. A suitable transmission scheme can be used to enable transmission and reception of two antenna site transmit diversity and two transport blocks. Communication can occur on a single carrier, such as a frequency resource.

  To provide a communication link for users on a moving vehicle, an LTE-based backhaul function can be used. For example, a node capable of communicating with an eNB fixed adjacent to a track can be provided on the train 5. In the example of FIG. 1, the train block 5 can be regarded as an example of a communication device including two directional antennas. The antennas 3 and 4 of the train 5 can include relay nodes that provide services to user devices on the train. Both the cell and the relay node on the train can have a directional antenna. If directional antennas are provided at both the receiver and the transmitter, an area is formed along the track where two strong links can be formed. One link can occur between the antenna 4 facing forward on the train and the antenna site 2 in front of the train. The other link is generated between the antenna 3 facing backward on the train and the antenna site 1 behind the train.

  Regardless of the implementation, the embodiment described in this specification exemplifies a node that operates as a communication device that communicates with a control node in a radio service area such as an eNB of an LTE cell, for example. Accordingly, block 5 of FIG. 1 can be considered to represent any multi-antenna mobile communication device communicating with two antenna sites in an eNB or similar base station configuration.

  According to an aspect, in order to take advantage of two links provided by two separate antenna sites of a cell, communication between the communication device and the cell is performed simultaneously between the communication device and both antennas. There are various ways to support this communication. For example, two directional antennas 1 and 2 at two antenna sites can be placed facing each other so that they are considered a single cell. A dual port common reference signal (CRS) can be configured with one common reference signal (CRS) port for each antenna.

  In order to enable operation of a base station and to manage a mobile communication device that communicates with a base station via multiple antenna sites, a base station configuration including multiple antenna sites is configured with at least one suitable It can be controlled by the controller 30. This controller can be interconnected with other control entities. The base station can be connected to a larger communication network. A controller may be provided for adjusting the operation of the access system. A gateway function for connecting to another network via this network can also be provided. This other network can be any suitable network. Accordingly, a vast communication system can be provided by one or more interconnected networks and elements thereof, and one or more gateways can be provided for interconnecting various networks.

  FIG. 2 is a schematic partial cross-sectional view of a communication device 21 that can be used by a user for communication. Such communication devices are often referred to as user equipment (UE) or terminals. An appropriate mobile communication device can be provided by any device capable of transmitting and receiving radio signals. Non-limiting examples include mobile stations (MS) such as mobile phones or what are known as “smartphones”, portable computers with wireless interface cards or other wireless interface mechanisms, portable information with wireless communication capabilities A terminal (PDA), or any combination thereof. Mobile communication devices can communicate data for communicating communications such as voice, electronic mail (email), text messages, and multimedia, for example. Therefore, many services can be proposed and provided to the user via the user's communication device. Non-limiting examples of these services include two-way or multi-way calling, data communication or multimedia services, or simply access to a data communication network system such as the Internet. Broadcast data or multicast data can also be provided to the user. Non-limiting examples of these content include downloads, television and radio programs, videos, advertisements, various warnings and other information.

  The mobile communication device 21 can send and receive signals through the wireless interface 28 via an appropriate device for sending and receiving signals. For example, in FIG. 1, a mobile communication device can communicate with antenna sites 1 and 2 via directional antennas 3 and 4. In FIG. 2, the transceiver device is schematically illustrated by block 27. This transceiver can be realized, for example, by a radio unit and an associated antenna configuration. This antenna configuration may be placed inside or outside the mobile device. A wireless communication device may comprise a multiple-input multiple-output (MIMO) antenna system.

  Typically, the mobile communication device performs at least one data processing entity 23, at least one memory 24, access to the base station and other communication devices, and control of communication therewith. And other possible components 29 used in the execution of software- and hardware-assisted tasks designed in such a way. These data processing devices, storage devices, and other associated control devices can be provided on suitable circuit boards and / or in a chipset. This feature is indicated by reference numeral 26. Control functions contemplated in view of configuring a mobile communication device to receive and / or transmit signaling information and data through a data processing mechanism according to some embodiments of the present invention are described later in this description. .

  The user can control the operation of the communication device via a suitable user interface such as the keypad 22, voice commands, touch-sensitive screen or pad, or combinations thereof. Usually, a display 25, a speaker and a microphone are also provided. In addition, the mobile communication device may include suitable connectors (either wired or wireless) for connecting external accessories such as hands-free devices to and / or to other devices.

  FIG. 3 shows an example of a control device 30 for controlling communication via at least two links provided in the radio service area of the base station, for example coupled to the base station and / or at least two antenna sites. . The controller 30 can be configured to control the use of communication resources over at least two different links by mobile communication devices residing in the service area. The control device 30 is for adjusting resource allocation information and other related information generation and communication related control functions and signaling and data communication resource allocation through a data processing mechanism according to some embodiments described below. It can be configured to provide a control function. For this purpose, the control device 30 comprises at least one memory 31, at least one data processing device 32, 33 and an input / output interface 34. The controller can be coupled to a base station receiver and transmitter device via an interface. The controller 30 can be configured to execute software code suitable for providing a control function.

  The necessary data processing equipment and functions of the base station equipment, communication equipment, relay station and any other suitable station can be provided by one or more data processors. The functions described in each department can be provided by separate processors or integrated processors. These data processors may be of any type suitable for a local technical environment, and include, but are not limited to, one or more general purpose computers, special purpose computers, microprocessors, digital signal processors ( DPS), application specific integrated circuits (ASICs), gate level circuits, and processors based on multi-core processor architectures. Data processing can also be distributed across multiple data processing modules. The data processor can also be realized, for example, by at least one chip. Appropriate storage capacity can also be provided in the associated equipment. These one or more memories may be of any type suitable for a local technical environment, such as semiconductor-based storage devices, magnetic storage devices and systems, optical storage devices and systems, fixed memories and removable. It can be implemented using any suitable data storage technology such as memory.

  Usually, various channels are provided between devices communicating in a communication system. A physical downlink control channel (PDCCH) is an example of a control channel that can be used to carry scheduling assignments and other control information related to resource assignments. A physical control channel can be transmitted in a bundle of one or more consecutive control channel elements.

  The two antennas 1 and 2 are spaced apart. Nevertheless, antennas 1 and 2 can be connected to the same base station, eg eNB. Thus, although two antenna sites are formed in the cell, this cell can contain only one base station. The base station controller 30 can individually allocate different resources to each link including a separate control channel, such as a separate physical downlink control channel (PDCCH).

  FIG. 4 is a flowchart that enables multiple control channels for communication devices in an area of a cell, according to an embodiment. For example, multiple physical control channels can be transmitted using spatial frequency block coding (SFBC). More specifically, at 100, the controller can allocate resources to the communication devices so that the controller can perform simultaneous communication via multiple antennas in the service area. In 102, the controller causes information about the allocated resource to be transmitted to the communication device via a plurality of control channels. The communications equipment receives information at 104 by monitoring these control channels. The communication device can then communicate at the same time via multiple antennas at 106 based on this information.

  Communication between the communication device and the two antenna sites can be performed on a single carrier. Information related to antennas communicated via the control channel may include resource grants that allocate transport blocks. Multiple resource grants can be signaled within one subframe. Resources can be individually allocated for communication via each antenna.

  In order to increase the flexibility of configuration so that a plurality of transport blocks (TBs) can be transmitted on the same resource, physical resource blocks (PRBs) can be individually assigned to two transport blocks. it can. For example, the controller 30 assigns different resources such as physical resource block (PRB), modulation and coding scheme (MCS), and transport block size (TBS) of each link including separate PDCCH to two transport blocks. Can be assigned.

  According to the possibility, for example, two-antenna transmission diversity can be provided based on Alamouti-type spatial frequency diversity block coding capable of transmitting and receiving two transport blocks. In this scheme, transport blocks can be supported for each transmit antenna and mapped to the same frequency resource. The two link modulation and coding schemes (MCS) can be flexibly adjusted so that the bit rate can be individually adapted to the link quality for the two antennas or transport blocks.

  In these embodiments, scheduling flexibility of a scheduler such as eNB scheduler can be enhanced. The ENB scheduler can be provided in the control device 30 of FIG.

  This multi-antenna multi-site diversity scheme can be extended, for example, to the case where there are two transmitter receiver (trx) chains per link, ie a total of four transmitter receivers and ports. . This case is shown in FIG.

  According to an embodiment, the network transmits multiple downlink and / or uplink resource grants to the user equipment in one subframe. Each grant can allocate one transport block. According to the possibility, a plurality of transport blocks are allocated by at least one of the plurality of grants.

  The communication device can be configured to have a specific mode of operation that can receive and process multiple control channels. According to an embodiment, a transmission mode based on a common reference signal (CRS) is provided. For example, a communication device such as a mobile user device can receive information regarding the mapping from codewords to antenna ports and the rank used for transmission when in this mode. These pieces of information are provided to enable the user equipment to map the common reference signal channel to the physical downlink shared channel (PDSCH). This information can be transmitted in a suitable control information element.

  For example, the modified downlink control information (DCI) format 1B may be used for resource allocation signaling for PDSCH transmission (transmission mode 6) with rank-1 closed-loop precoding. The information of format 1B is almost the same as that of DCI mode 1A, but an indicator of a precoding vector is added. According to one embodiment, transport block and codeword selection, and precoding matrix indication (PMI) reinterpretation are added to the DCI format 1B element to either the CRS port of the two possible ports, or 4 Codewords can be mapped to two of the two possible CRS ports. If four CRS ports are used, rank indication bits can also be added.

  Another possible mode is a transmission mode based on the use of a dedicated or demodulated reference signal (DRS or DM RS). Typically, dedicated reference signals are used for downlink (DL) transmission modes 7-9. For example, a modified DCI format 1 can be used to carry the additional information required in this mode. For example, information regarding antenna port, transport block, and codeword selection can be provided. If more than two layers are used for MIMO spatial multiplexing in PHY, rank indication bits can be used. Up to four layers can be mapped to one codeword.

  Another example is an uplink transmission mode that can use a modified DCI format 0. Typically, DCI format 0 is used for physical uplink shared channel (PUSCH) grants. This modified DCI format 0 may include an indication as to which transport block / codeword is transmitted and an antenna port indication. If more than two layers are used, rank indication bits can be used.

  When such a transmission mode is configured in the user apparatus, the user apparatus can monitor a plurality of PDCCHs. The user equipment can identify which antenna port and transport block the associated PDCCH refers to.

  In the PHY and RRC specifications, it may be necessary to define a new transmission mode for duplex or multiple PDCCH transmission.

  In some applications of DRS mode and uplink mode, a fixed mapping between codeword and antenna port can be used.

  Some of the information can be signaled implicitly. For example, information can be signaled by linking different parts of the available search space to different transport blocks. However, explicit signaling in the downlink assignment / uplink grant that does not limit the use of PDCCH for antenna ports to the corresponding search space can provide a more flexible solution.

  In some applications, the communication equipment in the downlink needs to check and operate according to all possible combinations of PDCCH location, PDCCH format and DCI format. However, such “blind decoding” may require the communication device to attempt decoding multiple times in each subframe. This can be addressed by limiting the location of a series of control channel elements where the PDCCH can be placed to the device. A series of locations where the PDCCH can be placed is often called a search space. The search space may vary in size for each PDCCH. A dedicated and common search space can be defined for communication devices. The dedicated search space can be configured individually for each downlink device. The range of the common search space can be notified to all devices.

  If a significant amount of downlink control information is transmitted to one user equipment, it may be necessary to expand the search space to avoid blocking. However, it is unlikely that there will be as many user equipments per sector, so in normal usage scenarios, physical downlink control channel (PDCCH) blocking will not be considered a problem over time. For example, the maximum number of user devices per sector can be assumed to be two.

  According to an embodiment, a search space offset may be configured for additional (single) PDCCHs. Thereby, different control channels from different base stations can be distinguished. For example, a search space offset can be associated with an antenna port indication.

  An ACK / NACK codebook for a hybrid automatic repeat request (HARQ) scheme can be based on the number of transport blocks configured. For example, in LTE, it has been proposed that a maximum of two transport blocks can be configured and related ACK / NACK messages can be fed back to the base station.

  Communication between the base station site and the user equipment can be realized via a relay. In relaying, an entity called a relay station (RS) or a relay node (RN) can be provided between the base station and the user equipment. The relay node may be a fixed type such as another base station, or may be a mobile type attached to a train as shown in FIGS. 1 and 5, for example. In some systems, a relay node or relay station can be provided by an opportunistic user equipment / mobile terminal that is not part of a communication network. A relay node (RN) can connect wirelessly to a communication system, typically to a station connected to a radio access network. Such a station is often referred to as a donor station or donor cell. The donor station provides resources or a backhaul link for radio backhaul to the relay.

  For example, loading one or more suitable computer program code products into a suitable data processing device to cause the determination of the proper configuration and / or resource allocation and communication of information between the various nodes, or If otherwise provided, embodiments may be implemented using the one or more computer program code products. A program code product that enables this operation can be stored on a suitable carrier medium and provided and embodied by a suitable carrier medium. An appropriate computer program can be embodied on a computer-readable recording medium. Program code products can also be downloaded via a data network. In general, the various embodiments may be implemented in hardware or dedicated circuitry, software, logic circuitry, or any combination thereof. Thus, embodiments of the present invention can be implemented in various components such as integrated circuit modules. Integrated circuit design is generally a highly automated process. Complex and powerful software tools can be utilized to translate a logic level design into a semiconductor circuit design that can be etched and formed on a semiconductor substrate at any time.

  Although the embodiments have been described in relation to communication systems such as those based on LTE-Advanced (LTE-A) systems and 3GPP-based systems, and signaling on PDCCH, the same principle is applied to other communication systems and control channels. It can also be applied to. Non-limiting examples of other communication systems include systems based on WCDMA® and HSPA. Therefore, instead of communication between a communication device such as a user apparatus and a base station, communication can be provided in various scenarios such as communication performed directly between two or more user apparatuses. For example, this may be applied to an application in which a communication system is provided by a plurality of user devices without providing a fixed station device in an ad hoc network, for example. The above principle can also be used in a network that uses a relay node to relay transmission between stations. Thus, although some embodiments have been described by way of example with reference to some exemplary architectures for wireless networks, technologies and standards, any suitable form of communication other than that shown and described herein. Embodiments can also be applied to the system.

  1 and 5 show an example in which a downlink device is located on a train and uses a separate relay node, but this is not the only use scenario. Rather, the present disclosure is intended to cover any configuration that allows unique resource allocation to downlink communication devices with different antennas in the service area.

  According to possibility, the antenna on the train is part of the train communication system and is for the part of the communication system that transmits signals related to the control of the train.

  While exemplary embodiments of the present invention have been described above, various changes and modifications can be made to the disclosed solution without departing from the spirit and scope of the present invention.

100 Allocation of resources for simultaneous communication via a plurality of antennas in a service area to communication devices 102 Communication of allocated resources to communication devices via a plurality of control channels 104 Multiple allocation of resource information allocated to communication devices Receives over 106 control channels and communicates simultaneously via multiple antennas in service area

Claims (37)

A method for controlling communication by a communication device,
Receiving, on a plurality of control channels, information of resources assigned to the communication device for communication via a plurality of antennas in a service area;
Communicating simultaneously via the plurality of antennas based on the information;
A method comprising the steps of: A resource allocation method in a service area of a communication system, comprising:
Allocating resources for simultaneous communication via a plurality of antennas in the service area to a communication device;
Transmitting information of the allocated resource to the communication device via a plurality of control channels;
A method comprising the steps of: The information includes a resource grant that allocates a transport block.
The method according to claim 1 or 2, characterized in that Signaling a plurality of resource grants within one subframe,
The method according to claim 3. Resources are individually allocated for communication via each of the antennas,
The method according to claim 1, wherein: The simultaneous communication includes communication on a single carrier,
6. A method according to any one of claims 1 to 5, characterized in that Associating the control channel with an antenna port and a transport block;
A method according to any of claims 1 to 6, characterized in that Mapping a reference signal to antenna ports of the plurality of antennas;
8. A method according to any one of claims 1 to 7, characterized in that Mapping a reference signal channel to a shared physical channel;
9. A method according to any one of claims 1 to 8, characterized in that Providing the communication equipment with information about at least one of an assigned transport block, codeword selection, rank, and antenna port;
10. A method according to any one of claims 1 to 9, characterized in that Communicating information about at least one of the transmitted transport block, codeword, rank, and antenna port in a downlink control information element;
11. A method according to any of claims 1 to 10, characterized in that Signaling the information about the allocated resource on a physical downlink control channel;
12. A method according to any of claims 1 to 11, characterized in that Allocating different resources to transport blocks associated with different antennas,
13. A method according to any of claims 1 to 12, characterized in that Including the use of an offset between search spaces associated with the control channel;
14. A method according to any one of claims 1 to 13, characterized in that The antenna includes a cell directional antenna,
15. A method according to any of claims 1 to 14, characterized in that The communication device moves relative to the plurality of antennas;
A method according to any of claims 1 to 15, characterized in that Monitoring a plurality of control channels by the communication device;
17. A method according to any one of claims 1 to 16, characterized in that Using spatial frequency block coding for communication,
18. A method according to any of claims 1 to 17, characterized in that An apparatus for controlling use of resources by communication devices in a service area, the apparatus comprising:
At least one processor;
At least one memory containing computer program code;
Wherein the at least one memory and the computer program code use the at least one processor,
Monitoring a plurality of control channels to receive information on resources allocated for communication via a plurality of antennas within the service area;
Based on the information, simultaneous communication is performed via the plurality of antennas.
A device characterized by that. An apparatus for controlling use of resources by communication devices in a service area, the apparatus comprising:
At least one processor;
At least one memory containing computer program code;
Wherein the at least one memory and the computer program code use the at least one processor,
Allocating resources for simultaneous communication via a plurality of antennas in the service area to the communication device,
Information on the allocated resource is transmitted to the communication device via a plurality of control channels;
Configured as
A device characterized by that. The information includes a resource grant that allocates a transport block.
21. A device according to claim 19 or 20, characterized in that Configured to allow multiple resource grants to be signaled in one subframe;
The apparatus of claim 21. Resources are individually allocated for communication via each of the antennas,
Device according to any of claims 19 to 22, characterized in that The communication device is configured to communicate on a single carrier via the plurality of antennas;
24. A device according to any of claims 19 to 23. Configured to associate the control channel with an antenna port and a transport block;
25. An apparatus according to any one of claims 19 to 24.   26. An apparatus according to any of claims 19 to 25, configured to map a reference signal to antenna ports of the plurality of antennas. Configured to map a reference signal channel to a shared physical channel;
27. Apparatus according to any of claims 19 to 26, characterized in that Configured to provide the communication device with information about at least one of an assigned transport block, codeword selection, rank, and antenna port;
28. A device according to any one of claims 19 to 27. Configured to signal the information about the allocated resource on a physical downlink control channel;
29. A device according to any one of claims 19 to 28. Configured to allocate different resources to transport blocks associated with different antennas,
30. A device according to any of claims 19 to 29.   31. The apparatus according to any of claims 19 to 30, wherein the apparatus is configured to use an offset between search spaces associated with the control channel. The plurality of antennas includes at least one directional antenna;
32. A device according to any of claims 19 to 31. The communication device is configured to have a transmission mode that allows use of the plurality of control channels and antennas;
33. Apparatus according to any of claims 19 to 32, characterized in that   34. A device for a communication system comprising the device according to any one of claims 19 to 33. Including a base station or mobile user equipment,
35. The device of claim 34. Comprising program code means adapted to perform the steps of any of claims 1 to 18 when executed on a data processing device,
A computer program characterized by the above. A device or apparatus according to any one of claims 19 to 35 is provided,
A communication system characterized by the above.

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