Method of allocating a resource in a wireless communication system and device for same
14 claims: 2 independent, 12 dependent
- 1無線通信システムにおいて端末が基地局からダウンリンクデータチャネルを受信する方法であって、 複数のシンボルを含むサブフレームにおける第1のダウンリンクデータチャネルおよび第2のダウンリンクデータチャネルを受信すること を含み、 前記サブフレームにおける前記第1のダウンリンクデータチャネルの第1の開始シンボルは、物理制御フォーマット指示子チャネルを介して伝送される値によって 指示 され、 前記サブフレームにおける前記第2のダウンリンクデータチャネルの第2の開始シンボルは、 RRC(Radio Resource Control)シグナリング によって 指示 されている、方法。
- 2前記第1のダウンリンクデータチャネルは、第1のダウンリンク制御チャネルによってスケジューリングされ、前記第2のダウンリンクデータチャネルは、第2のダウンリンク制御チャネルによってスケジューリングされている、請求項1に記載の方法。
- 3前記第2のダウンリンク制御チャネルの第2の開始シンボルは、前記第2のダウンリンクデータチャネルの前記開始シンボルと同一である、請求項2に記載の方法。
- 4前記制御フォーマット指示子チャネルを介して伝送される前記値は、前記第1のダウンリンク制御チャネルのためのシンボルの数を指示する、請求項2に記載の方法。
- 5前記第2の開始シンボルのインデックスは、前記第1の開始シンボルのインデックスよりも小さいか、または 前記第1の開始シンボルのインデックスに 等しい、請求項1に記載の方法。
- 6前記第2の開始シンボルの前記インデックスが、前記第1の開始シンボルの前記インデックスよりも小さい場合に、前記第1の開始シンボルから前記サブフレームの終了シンボルまで前記第2のダウンリンクデータチャネルをデコーディングし、それから、前記第2の開始シンボルから前記第1の開始シンボルまで前記第2のダウンリンクデータチャネルをデコーディングすることをさらに含む、請求項5に記載の方法。
- 7前記第2の開始シンボルの前記インデックスが、前記第1の開始シンボルの前記インデックスよりも小さい場合に、前記第2の 開始シンボル から前記サブフレームの終了シンボルまで前記第2のダウンリンクデータチャネルをデコーディングすることをさらに含む、請求項5に記載の方法。
- 8無線通信システムにおいて基地局が端末にダウンリンクデータチャネルを送信する方法であって、 複数のシンボルを含むサブフレームにおける第1のダウンリンクデータチャネルおよび第2のダウンリンクデータチャネルを送信すること を含み、 前記サブフレームにおける前記第1のダウンリンクデータチャネルの第1の開始シンボルは、物理制御フォーマット指示子チャネルを介して伝送される値によって 指示 され、 前記サブフレームにおける前記第2のダウンリンクデータチャネルの第2の開始シンボルは、 RRC(Radio Resource Control)シグナリング によって 指示 されている、方法。
- 9前記第1のダウンリンクデータチャネルは、第1のダウンリンク制御チャネルによってスケジューリングされ、前記第2のダウンリンクデータチャネルは、第2のダウンリンク制御チャネルによってスケジューリングされている、請求項8に記載の方法。
- 10前記第2のダウンリンク制御チャネルの第2の開始シンボルは、前記第2のダウンリンクデータチャネルの前記開始シンボルと同一である、請求項9に記載の方法。
- 11前記制御フォーマット指示子チャネルを介して伝送される前記値は、前記第1のダウンリンク制御チャネルのためのシンボルの数を指示する、請求項9に記載の方法。
- 12前記第2の開始シンボルのインデックスは、前記第1の開始シンボルのインデックスよりも小さいか、または 前記第1の開始シンボルのインデックスに 等しい、請求項8に記載の方法。
- 13前記第2の開始シンボルの前記インデックスが、前記第1の開始シンボルの前記インデックスよりも小さい場合に、前記第1の開始シンボルから前記サブフレームの終了シンボルまで前記第2のダウンリンクデータチャネルをマッピングし、それから、前記第2の開始シンボルから前記第1の開始シンボルまで前記第2のダウンリンクデータチャネルをマッピングすることをさらに含む、請求項12に記載の方法。
- 14前記第2の開始シンボルの前記インデックスが、前記第1の開始シンボルの前記インデックスよりも小さい場合に、前記第2の 開始シンボル から前記サブフレームの終了シンボルまで前記第2のダウンリンクデータチャネルをマッピングすることをさらに含む、請求項12に記載の方法。
Independent claims14
78 paragraphs, as filed
The present invention relates to a wireless communication system, and more particularly to a new control channel frequency resource allocation method existing in a node data area in a multiple distributed node system and a device therefor.
The current wireless communication environment has become widespread with the advent and widespread use of various devices such as M2M devices to which Machine-to-Machine (M2M) communication is applied, smartphones and tablet computers that require a high amount of data transmission. The amount of data required for networks in wireless communication systems is also increasing rapidly. To meet these rapidly increasing data demands, communication technologies include carrier aggregation and cognitive radio technologies for the efficient use of wider frequency bands, and limited frequencies. It has been developed into multiple antenna technology and multiple base station cooperation technology to increase the data capacity within the wireless communication environment, and the density of nodes that can access the user's surroundings is increasing. A system provided with such high-density nodes can exhibit even higher system performance by coordinating the nodes. In such a method, each node is a base station (for example, Base station, Advanced). Multiple nodes operating as BS, Node-B, eNode-B), access point (AP), antenna, antenna group, radio remote header (RRH), radio remote unit (RRU) Cooperative communication is performed using.
Furthermore, if all nodes are managed by one controller and individual nodes operate like a group of antennas of one base station, this system is one DMNS (distributed multi node system). ). At this time, the individual nodes may be given individual Node IDs, or may operate like a partial antenna in a cell without individual Node IDs.
On the other hand, if each node has a different cell ID in DMNS, this can be regarded as a multi-cell (eg, macro cell / femto cell / pico cell) system. If multiple cells formed by each of multiple nodes are overlaid by coverage, this is named a multi-tier network.
On the other hand, various forms of base stations may be used as nodes regardless of their names. That is, even if BS (Base Station), NB (Node-B), eNB (eNode-B), pico-cell eNB (PeNB), home eNB (HeNB), RRH, RRU, relay, repeater, etc. become nodes. Good. At least one antenna is provided for one node. Antenna may mean a physical antenna, or an antenna port, virtual antenna, or antenna group. Nodes are also sometimes called points.
A node usually means a group of antennas separated by a certain interval or more, but may mean an arbitrary group of antennas regardless of the interval. For example, it can be defined that a base station controls a node composed of an H-pol antenna and a node composed of a V-pol antenna. The antenna described herein not only refers to a physical antenna, but may be replaced by an antenna port, a virtual antenna, an antenna group, or the like.
<p num="0007"> An object of the present invention is to provide a method and a device for efficiently allocating resources for a physical channel in a wireless communication system. Another object of the present invention is to provide a channel format, signal processing, and a device for efficiently transmitting control information. Still another object of the present invention is to provide a method and a device for efficiently allocating resources for transmitting control information.</p><p num="0008"> The technical problems to be achieved in the present invention are not limited to the above technical problems, and other technical problems not mentioned are described below, and the usual knowledge in the technical field to which the present invention belongs can be obtained. It will be clearly understood by those who have it.</p>
<p num="0009"> One aspect of the present invention is a method in which a terminal receives control information in a downlink subframe that is divided into a PDCCH (Physical Downlink Control Channel) area and a PDSCH (Physical Downlink Shared Channel) area in a wireless communication system. Receiving from the base station the first CFI information that indicates the number of OFDM (Orthogonal Frequency Division Multiplexing) symbols that can be used for PDCCH transmission. E-PDCCH (enhanced Physical Data Control) Receive a second CFI information from the base station indicating the start OFDM symbol information available for PDSCH transmission corresponding to Channel) and PDSCH based on the first CFI information or the second CFI information. The PDCCH is located in the PDCCH region of the downlink subframe, and the E-PDCCH is located in the PDSCH region of the downlink subframe, including receiving the control information from the base station. Provided.</p><p num="0010"> Another aspect of the present invention is a method in which a base station transmits control information in a downlink subframe that is divided into a PDCCH (Physical Downlink Control Channel) region and a PDSCH (Physical Downlink Shared Channel) region in a wireless communication system. Then, the first CFI information indicating the number of OFDM (Orthogonal Frequency Division Multiplexing) symbols that can be used for PDCCH (Physical Downlink Control Channel) transmission is transmitted to the terminal, and E-PDCCH (enhanced Physical Data Control) is transmitted. PDSCH by transmitting the second CFI information indicating the start OFDM symbol information available for PDSCH transmission corresponding to Channel) to the terminal, and using the first CFI information and the second CFI information. Is located in the PDCCH region of the downlink subframe, and the E-PDCCH is located in the PDSCH region of the downlink subframe, including the transmission of the PDCCH to the terminal. Will be done.</p><p num="0011"> As another aspect of the present invention, a terminal configured to receive control information in a downlink subframe that is divided into a PDCCH (Physical Downlink Control Channel) area and a PDSCH (Physical Downlink Shared Channel) area in a wireless communication system. It comprises a radio frequency (RF) unit and a processor, which provides first CFI information indicating the number of OFDM (Orthogonal Frequency Division Multiplexing) symbols available for PDCCH transmission. E-PDCCH (enhanced Physical Data Control) controls the radio frequency unit so that it can be received from the base station. The radio frequency unit is controlled to receive the second CFI information indicating the start OFDM symbol information available for PDSCH transmission corresponding to Channel) from the base station, and the first CFI information or the second CFI information is received. The radio frequency unit is configured to control the radio frequency unit to receive PDSCH from the base station based on the CFI information of the above, the PDCCH is located in the PDCCH region of the downlink subframe, and the E-PDCCH is the downlink. A terminal is provided located in the PDSCH area of the link subframe.</p><p num="0012"> As another aspect of the present invention, a base configured to transmit control information in a downlink subframe that is distinguished into a PDCCH (Physical Downlink Control Channel) region and a PDSCH (Physical Downlink Shared Channel) region in a wireless communication system. A first CFI information station that comprises a radio frequency (RF) unit and a processor, the processor indicating the number of OFDM (Orthogonal Frequency Division Multiplexing) symbols available for PDCCH transmission. E-PDCCH (enhanced Physical Data Control) by controlling the radio frequency unit so as to transmit The radio frequency unit is controlled to transmit the second CFI information indicating the start OFDM symbol information available for PDSCH transmission corresponding to Channel) to the terminal, and the first CFI information and the second CFI information are transmitted. The radio frequency unit is configured to control the radio frequency unit to transmit PDSCH to the terminal using CFI information, the PDCCH is located in the PDCCH region of the downlink subframe, and the E-PDCCH is the downlink. A base station is provided located in the PDSCH area of the subframe.</p><p num="0013"> Preferably, the first CFI information is received from the base station by RRC (Radio Resource Control) signaling, and the second CFI information is received from the base station by RRC signaling or included in the E-PDCCH. Will be done.</p><p num="0014"> Preferably, when the control channel for the hibernating terminal is a subframe to be transmitted, the PDSCH is received from the base station based only on the first CFI information.</p>
<p num="0015"> According to the embodiments of the present invention, resources for physical channels can be efficiently allocated in a wireless communication system, preferably a multiple distributed node system.</p><p num="0016"> The effects obtained in the present invention are not limited to the effects mentioned above, and other effects not mentioned above are clearly described below to those who have ordinary knowledge in the field of technology to which the present invention belongs. Will be understood.<u style="single">The present invention further provides, for example,:</u><u style="single">(Item 1)</u><u style="single"> In a wireless communication system, a terminal receives control information in a downlink subframe that is divided into a PDCCH (Physical Downlink Control Channel) area and a PDSCH (Physical Downlink Shared Channel) area.</u><u style="single"> Receiving from the base station the first CFI information that indicates the number of OFDM (Orthogonal Frequency Division Multiplexing) symbols that can be used for PDCCH transmission.</u><u style="single"> Receiving from the base station a second CFI information indicating the start OFDM symbol information that can be used for PDSCH transmission corresponding to E-PDCCH (enhanced Physical Data Control Channel).</u><u style="single"> Receiving PDSCH from the base station based on the first CFI information or the second CFI information,</u><u style="single">Including</u><u style="single"> A control information receiving method in which the PDCCH is located in the PDCCH region of the downlink subframe, and the E-PDCCH is located in the PDSCH region of the downlink subframe.</u><u style="single">(Item 2)</u><u style="single"> The item in which the first CFI information is received from the base station by RRC (Radio Resource Control) signaling, and the second CFI information is received from the base station by RRC signaling or included in the E-PDCCH. The control information receiving method described in 1.</u><u style="single">(Item 3)</u><u style="single"> The control information receiving method according to item 1, wherein the PDSCH is received from the base station based only on the first CFI information when the control channel for the hibernating terminal is a subframe to be transmitted.</u><u style="single">(Item 4)</u><u style="single"> In a wireless communication system, a base station transmits control information in a downlink subframe that is divided into a PDCCH (Physical Downlink Control Channel) area and a PDSCH (Physical Downlink Shared Channel) area.</u><u style="single"> Sending the first CFI information to the terminal, which indicates the number of OFDM (Orthogonal Frequency Division Multiplexing) symbols that can be used for PDCCH (Physical Downlink Control Channel) transmission,</u><u style="single"> Sending a second CFI information indicating the start OFDM symbol information that can be used for PDSCH transmission corresponding to E-PDCCH (enhanced Physical Data Control Channel) to the terminal, and</u><u style="single"> Using the first CFI information and the second CFI information to transmit PDSCH to the terminal,</u><u style="single">Including</u><u style="single"> A control information transmission method in which the PDCCH is located in the PDCCH region of the downlink subframe, and the E-PDCCH is located in the PDSCH region of the downlink subframe.</u><u style="single">(Item 5)</u><u style="single"> The first CFI information is transmitted to the terminal by RRC (Radio Resource Control) signaling, and the second CFI information is transmitted to the terminal by RRC signaling or included in the E-PDCCH, in item 4. The described control information transmission method.</u><u style="single">(Item 6)</u><u style="single"> The control information transmission method according to item 4, wherein the PDSCH is transmitted to the terminal based only on the first CFI information when the control channel for the hibernating terminal is a transmission subframe.</u><u style="single">(Item 7)</u><u style="single"> A terminal configured to receive control information in a downlink subframe that is divided into a PDCCH (Physical Downlink Control Channel) area and a PDSCH (Physical Downlink Shared Channel) area in a wireless communication system.</u><u style="single"> Radio Frequency (RF) unit and</u><u style="single"> With a processor,</u><u style="single"> The processor</u><u style="single"> The radio frequency unit is controlled to receive the first CFI information indicating the number of OFDM (Orthogonal Frequency Division Multiplexing) symbols available for PDCCH transmission from the base station.</u><u style="single"> The radio frequency unit is controlled so as to receive the second CFI information indicating the start OFDM symbol information available for PDSCH transmission corresponding to the E-PDCCH (enhanced Physical Data Control Channel) from the base station.</u><u style="single"> It is configured to control the radio frequency unit to receive PDSCH from the base station based on the first CFI information or the second CFI information.</u><u style="single"> A terminal in which the PDCCH is located in the PDCCH region of the downlink subframe and the E-PDCCH is located in the PDSCH region of the downlink subframe.</u><u style="single">(Item 8)</u><u style="single"> The processor controls the radio frequency unit so that the first CFI information is received from the base station by RRC (Radio Resource Control) signaling, and the second CFI information is received by RRC signaling or the E-PDCCH. 7. The terminal according to item 7, which is included in the above and is configured to control the radio frequency unit so as to receive from the base station.</u><u style="single">(Item 9)</u><u style="single"> The processor controls the radio frequency unit to receive PDSCH from the base station based solely on the first CFI information when the control channel for the hibernating terminal is a subframe transmitted. The terminal according to item 7, which is configured as described above.</u><u style="single">(Item 10)</u><u style="single"> A base station configured to transmit control information in a downlink subframe that is divided into a PDCCH (Physical Downlink Control Channel) area and a PDSCH (Physical Downlink Shared Channel) area in a wireless communication system.</u><u style="single"> Radio Frequency (RF) unit and</u><u style="single"> With a processor,</u><u style="single"> The processor</u><u style="single"> The radio frequency unit is controlled to transmit the first CFI information indicating the number of OFDM (Orthogonal Frequency Division Multiplexing) symbols available for PDCCH transmission to the terminal.</u><u style="single"> The radio frequency unit is controlled to transmit a second CFI information indicating the start OFDM symbol information available for PDSCH transmission corresponding to the E-PDCCH (enhanced Physical Data Control Channel) to the terminal.</u><u style="single"> The radio frequency unit is configured to control the radio frequency unit to transmit PDSCH to the terminal using the first CFI information and the second CFI information.</u><u style="single"> A base station in which the PDCCH is located in the PDCCH region of the downlink subframe and the E-PDCCH is located in the PDSCH region of the downlink subframe.</u><u style="single">(Item 11)</u><u style="single"> The processor controls the radio frequency unit so that the first CFI information is transmitted to the terminal by RRC (Radio Resource Control) signaling, and the second CFI information is transmitted by RRC signaling or the E-PDCCH. 10. The base station according to item 10, which is included in the above and is configured to control the radio frequency unit so as to be transmitted to the terminal.</u><u style="single">(Item 12)</u><u style="single"> The processor controls the radio frequency unit to transmit PDSCH to the terminal based solely on the first CFI information when the control channel for the hibernating terminal is a subframe to be transmitted. The base station according to item 10, which is configured in.</u></p>
The accompanying drawings included as part of a detailed description to aid an understanding of the invention provide examples of the invention and will explain the technical ideas of the invention along with the detailed description.<figref num="1">It is a figure which shows the example of the DAS composition to which this invention is applied.</figref><figref num="2">It is a figure which shows the example of the control area which PDCCH can be transmitted by 3GPP LTE / LTE-A.</figref><figref num="3">It is a figure which illustrates the structure of the uplink subframe used in a 3GPP system.</figref><figref num="4">It is a figure which shows the control channel assigned to a downlink subframe.</figref><figref num="5">It is a figure which illustrates the resource mapping relation of PCFICH by a cell ID.</figref><figref num="6">It is a figure which shows an example of resource allocation using e-PDCCH.</figref><figref num="7">It is a figure which shows the allocation structure of R-PDCCH for a relay.</figref><figref num="8">It is a figure which shows the Example of PDSCH transmission in a part area of PDCCH by the CFI and CFI2 setting of this invention.</figref><figref num="9">It is a figure which shows one Example of RE mapping (mapping) of PDSCH which concerns on this invention.</figref><figref num="10">It is a figure which shows one Example of RE mapping (mapping) of PDSCH which concerns on this invention.</figref><figref num="11">It is a figure which illustrates the base station and the terminal applicable to this invention.</figref>
Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. The detailed description disclosed below, along with the accompanying drawings, is intended to illustrate exemplary embodiments of the invention and does not represent the only embodiment in which the invention can be practiced. The following detailed description includes specific details to provide a complete understanding of the present invention. However, as will be appreciated by those skilled in the art, the present invention can be practiced without such specific details. For example, the following detailed description will take up the case where the mobile communication system is a 3GPP LTE system or an IEEE 802.16m system, but except for matters specific to 3GPP LTE or IEEE 802.16m, any other mobile communication. It is also applicable to the system.
In some cases, known structures and devices may be omitted in order to avoid obscuring the concept of the present invention, and may be shown in the form of a block diagram centered on the core functions of each structure and device. is there. In addition, the same components will be described with reference to the same drawing reference throughout the present specification.
A wireless communication system to which the present invention can be applied includes at least one base station (BS). Each base station provides communication services to terminals (User Equipment, UE) located in a specific geographical area (generally referred to as a "cell"). The terminal may be fixed or mobile, and includes various devices that communicate with the base station to send and receive user data and / or various control information. The terminals are terminal (Terminal Equipment), MS (Mobile Station), MT (Mobile Terminal), UT (User Terminal), SS (Subscribe Station), wireless device (wireless device), PDA (Personal Digital Assistant), wireless modem ( It is also called a wireless modem) or a handheld device. Base stations are generally fixed points that communicate with terminals and / or other base stations. Station), which communicates with terminals and other base stations to exchange various data and control information. Base stations are sometimes referred to as other terms such as eNB (evolved-NodeB), BTS (Base Transceiver System), access point (Access Point), and processing server (PS).
The cell area serviced by the base station may be divided into a plurality of smaller areas in order to improve system performance. Each smaller area is sometimes referred to as a sector or segment. The cell identifier (Cell ID dentity; Cell_ID or IDCell) is given based on the entire system, while the sector or segment identifier is given based on the cell area to which the base station provides services. Terminals are generally distributed in wireless communication systems and are fixed or mobile. Each terminal can communicate with one or more base stations via uplink (Uplink, UL) and / or downlink (Downlink, DL) at any moment.
The present invention is applicable to various multi-node systems. For example, examples of the present invention include distributed antenna systems (DAS), macronodes with low-power RRH, multiple base station coordination systems, pico- / femtocell coordination systems, these. It can be applied to combinations and the like. In a multi-node system, one or more base stations connected to a plurality of nodes may cooperate so as to simultaneously transmit a signal to a terminal or receive a signal from the terminal at the same time.
A DAS is a base station or a base station controller that manages multiple antennas located at predetermined intervals within an arbitrary geographical area (called a "cell") and a plurality of dispersions connected via a cable or a dedicated line. Use the antenna for communication. In DAS, each antenna or each antenna group may be one node of the multi-node system of the present invention, and each antenna of DAS can operate as a subset of the antennas provided in the one base station or one base station controller. Is. That is, DAS is a type of multi-node system, and a distributed antenna or antenna group is a type of node in a multi-antenna system. DAS is a centralized antenna system in which multiple antennas are concentrated in the center of the cell in that multiple antennas provided in the DAS are located in the cell at regular intervals. Distinguished from system, CAS). DAS is not managed by distributed antennas or distributed antenna groups, but femto-in that all antennas located within a cell are managed by a base station or base station controller at the center of the cell. / Pico-Different from cell coordination system. DAS is also a relay system or ad-hoc that uses a base station that is wirelessly connected to a relay station (RS) in that the distributed antennas are connected to each other via cables or dedicated lines. ) Different from the network. In addition, DAS sends a signal different from other distributed antennas or distributed antenna groups to a terminal in which the distributed antenna or distributed antenna group is located near the antenna or antenna group in response to a command from the base station or base station controller. In that it can be transmitted, it is distinguished from a repeater that simply amplifies and transmits a signal.
Each node of the multiple base station cooperation system or the femto- / pico-cell cooperation system operates as an independent base station and cooperates with each other. Therefore, each base station of the multiple base station cooperation system or the femto- / pico-cell cooperation system may be a node in the multiple node system of the present invention. Multiple nodes in a multiple base station cooperative system or a femto- / pico-cell cooperative system are connected to each other via a backbone network or the like, and perform coordinated transmission / reception by performing scheduling and / or handover together. .. A system in which a large number of base stations participate in coordinated transmission in this way is also called a CoMP (Coordinated Multi-Point) system.
Differences exist between various multi-node systems such as DAS, macronodes with low power RRH, multi-base station coordinating systems, femto- / pico-cell coordinating systems, etc. However, unlike single-node systems (eg CAS, traditional MIMO systems, traditional transit systems, traditional repeater systems, etc.), multiple nodes participate in coordinating to provide communication services to terminals. Therefore, all of the examples of the present invention are applicable. Hereinafter, for convenience of explanation, the present invention will be described mainly by taking DAS as an example. However, the following description is merely exemplary, the DAS antenna or antenna group may correspond to a node in another multi-node system, and the DAS base station may be one or more of the other multi-node systems. Since it may correspond to a cooperative base station, the present invention can be applied to other multi-node systems in the same manner.
FIG. 1 is a diagram showing an example of a DAS structure to which the present invention is applied. Specifically, FIG. 1 is an example of a system structure in which DAS is applied to a centralized antenna system using a conventional cell-based multiple antenna. Is shown.
Referring to FIG. 1, a plurality of centralized antennas having similar effects such as path loss because the antenna spacing is very small compared to the cell radius in the region adjacent to the base station according to the embodiment of the present invention. (Centralized Antenna, CA) is located. In addition, since the cell areas are located at intervals of a predetermined distance or more and the antenna spacing is wider than that of CA, a plurality of distributed antennas (DA) having different effects such as path loss for each antenna are used. positioned.
DA is composed of one or more antennas connected by one wire from a base station, and may be used in the same meaning as a DAS antenna node (node) or an antenna node. One or more DAs form a DA group to form a DA zone.
The DA group includes one or more DAs, and may be variably configured depending on the position of the terminal, the reception state, or the like, or may be fixedly configured by the maximum number of antennas used in MIMO. The DA group is sometimes called the antenna group. The DA zone is defined as the range in which the antennas forming the DA group can transmit or receive the signal, and the cell area in the figure includes n DA zones. A terminal belonging to the DA zone can communicate with any one or more of the DAs constituting the DA zone, and the base station simultaneously uses the DA and the CA when transmitting a signal to the terminal belonging to the DA zone. The transmission rate can be increased.
Figure 1 shows a CAS that includes DAS so that base stations and terminals can use DAS in a CAS structure that uses existing multiple antennas, and the locations of CA and DA are separated for simplicity of explanation. However, the present invention is not limited to this, and various positions may be used depending on the embodiment.
On the other hand, the cell area provided by the base station may be divided into a plurality of smaller areas in order to improve the system performance. Each smaller area can be referred to as a sector or segment. The cell identifier (Cell Identity; Cell_ID or IDCell) is given relative to the entire system, while the sector or segment identifier is given relative to the cell area serviced by the base station. Terminals are generally distributed in wireless communication systems and are fixed or mobile. Each terminal can communicate with one or more base stations via uplink (Uplink, UL) and downlink (Downlink, DL) at any moment.
FIG. 1 is a diagram showing a CAS including a DAS so that a base station and a terminal can use the DAS in a CAS structure using an existing multiple antenna, and the positions of the CA and the DA are separated for simplicity of explanation. However, the position is not limited to the example shown in FIG. 1, and may be set to various positions depending on the embodiment.
As shown in FIG. 1, the antenna or antenna node that supports each terminal may be limited. In particular, during downlink data transmission, different data for each antenna or antenna node may be transmitted for each terminal over the same time and frequency resources. This can be regarded as a kind of MU-MIMO operation in which a different data stream is sent for each antenna or antenna node depending on the antenna or antenna node selection.
In the present invention, each antenna or antenna node may be an antenna port. An antenna port is a logical antenna embodied by a single physical transmission antenna or a combination of a plurality of physical transmission antenna elements. Further, in the present invention, each antenna or antenna node may be a virtual antenna. The signal transmitted by one beam precoded by the beamforming technique is recognized as if it was transmitted by one antenna, but this one antenna that transmits the beam in the precoded form is a virtual antenna. That is. Further, in the present invention, each antenna or antenna node may be distinguished by a reference signal (pilot). An antenna group that includes one or more antennas that transmit the same reference signal or pilot means a set of one or more antennas that transmit the same reference signal or pilot. That is, each antenna or antenna node of the present invention may be understood as an antenna identified by one physical antenna, one set of physical antennas, one antenna port, one virtual antenna, or one reference signal / pilot. In the embodiments of the present invention described below, the antenna or antenna node means any one of a physical antenna, a set of physical antennas, an antenna port, a virtual antenna, or an antenna identified by a reference signal / pilot. it can. Hereinafter, the present invention will be described in which the antennas identified by one physical antenna, one set of physical antennas, one antenna port, one virtual antenna, and one reference signal / pilot are collectively referred to as antennas or antenna nodes.
Referring to FIG. 2, the radio frame structure used in 3GPP LTE / LTE-A has a length of 10ms (327200Ts) and is composed of 10 equally sized subframes. Each subframe has a length of 1 ms and consists of two slots. Each slot has a length of 0.5 ms. Here, Ts represents the sampling time and is displayed as Ts = 1 / (2048 × 15kHz). Slots contain multiple Orthogonal Frequency Division Multiplexing Access (OFDMA) symbols in the time domain and multiple resource blocks in the frequency domain. block) is included. A resource block contains multiple subcarriers in a frequency domain. OFDMA symbols are sometimes called OFDMA symbols, SC-FDMA symbols, etc., depending on the multiple access method. The number of OFDMA symbols contained in one slot may be variously changed depending on the channel bandwidth and CP length. For example, a normal CP contains 7 OFDMA symbols per slot, while an extended CP contains 6 OFDMA symbols per slot. Although FIG. 2 illustrates a subframe in which one slot is composed of seven OFDMA symbols for convenience of explanation, the examples of the present invention described later will be the same for other types of subframes. It can be applied by the method of. For reference, in 3GPP LTE / LTE-A, a resource composed of one OFDMA symbol and one subcarrier is sometimes called a resource element (RE).
In 3GPP LTE / LTE-A, each subframe contains a control area and a data area, and the control area contains one or more OFDMA symbols starting from the first OFDMA symbol. The size of the control area should be set independently for each subframe. For reference, in addition to PDCCH, PCFICH, PHICH (Physical Hybrid automatic retransmit request Indicator CHannel), and the like may be assigned to the control area.
As shown in FIG. 2, the control information is transmitted to the terminal using a predetermined time and frequency resource among the radio resources. In the control channel, all the control information about the terminal including the MAP information is transmitted together, and each terminal searches for and receives its own control channel from the control channels transmitted by the base station. The resources occupied by such a control channel can only increase as the number of terminals in the cell increases. In the future, as machine-to-machine (M2M) communication and DAS begin to activate and the number of terminals in the cell increases further, the control channels to support those terminals will have to increase. That is, the number of OFDMA symbols occupied by the control channel in one subframe and / or the number of subcarriers occupied by the control channel in one subframe must increase. Therefore, the present invention provides a method for effectively utilizing the control channel by using the characteristics of the DAS.
According to current communication standards based on CAS, all antennas belonging to one base station transmit control channels (eg, MAP, A-MAP, PDCCH, etc.) to all terminals in the base station in the control area. To do. Each terminal processes the control area, which is a common area promised for control information transmission, in order to obtain information about the antenna node assigned to it and control information such as downlink / uplink resource allocation information. And you have to get your own control information. For example, it is necessary to apply a method such as blind decoding to obtain its own control information from the signals transmitted in the control area.
When control information about all terminals is transmitted in the same control area for each antenna based on the current communication standard, there is an advantage that it is easy to realize because each antenna only needs to transmit the same signal in the control area. However, due to factors such as an increase in the number of terminals that the base station should cover, MU-MIMO operation, and additional control information for DAS (for example, antenna node information assigned to terminals), the control that should be transmitted. As the size of the information increases, so does the size or number of control channels, which can make it difficult to transmit all control information in the existing control area.
Figure 3 illustrates the structure of the uplink subframe used in a 3GPP system.
Referring to FIG. 3, the 1 ms long subframe 500, which is the basic unit of LTE uplink transmission, is composed of two 0.5 ms slots 501. Assuming the length of Normal CP (Normal Cyclic Prefix), each slot is composed of 7 symbols 502, and 1 symbol corresponds to 1 SC-FDMA symbol. The resource block (RB) 503 is a resource allocation unit corresponding to 12 subcarriers in the frequency domain and 1 slot in the time domain. The structure of the LTE uplink subframe is roughly divided into a data area 504 and a control area 505. The data area means a communication resource used for transmitting data such as voice and packets transmitted to each terminal, and includes PUSCH (Physical Uplink Shared Channel). The control area means a communication resource used for transmitting a downlink channel quality report, a received ACK / NACK for a downlink signal, an uplink scheduling request, etc. from each terminal, and PUCCH (Physical Uplink Control). Channel) is included. The Sounding Reference Signal (SRS) is transmitted in one subframe through the SC-FDMA symbol located at the end on the time axis and the data transmission band on the frequency axis. The SRS of multiple terminals transmitted by SC-FDMA at the end of the same subframe can be distinguished by frequency position / sequence.
The resource block mapping will be described below. A physical resource block (PRB) and a virtual resource block (Virtual Resource Block, VRB) are defined. The physical resource block is as illustrated in FIG. That is, a physical resource block is defined by a predetermined number of consecutive OFDM symbols in the time domain and a predetermined number of consecutive subcarriers in the frequency domain. Physical resource blocks are given a predetermined number starting from 0 in the frequency domain. The relationship between the physical resource block number () and the resource element in the slot is as shown in Equation 1 below.
<maths num="1"><img id="000002" he="21" wi="38" file="JP5719087B2_D0001.tif" img-format="tif" img-content="drawing" /></maths>
Where k represents the subcarrier index and is N<sup>RB</sup><sub>SC</sub>Represents the number of subcarriers contained in one resource block.
The virtual resource block has the same size as the physical resource block. Localized type virtual resource blocks (Localized VRB, LVRB) and distributed type virtual resource blocks (Distributed VRB, DVRB) are defined. Regardless of the type of virtual resource block, a pair of resource blocks are allocated together across two slots in a subframe with a single virtual resource block number ().
FIG. 4 illustrates the resource mapping relationship of PCFICH by cell ID.
Referring to FIG. 4, PHICH is a physical H-ARQ indicator channel used to carry H-ARQACK / NACK for uplink transmission. PHICH consists of 3 REGs and is scrambled to cell-specific. ACK / NACK is indicated by 1 bit, spread by SF (spreading factor) = 4, and repeated 3 times. Multiple PHICHs may be mapped to the same resource. PHICH is modulated by BPSK (Binary phase shift keying).
The PDCCH is the physical downlink control channel and is assigned to the n OFDM symbol at the beginning of the subframe. Here, n is an integer greater than or equal to 1 and is indicated by PCFICH. PDCCH is assigned in units of CCE, and one CCE contains 9 REGs. The PDCCH informs information related to resource allocation of PCH (Paging channel) and DL-SCH (Downlink-shared channel), which are transmission channels, uplink scheduling grant, H-ARQ information, and the like. PCH (Paging channel) and DL-SCH (Downlink-shared) channel) is transmitted via PDSCH. Therefore, base stations and terminals generally transmit and receive data on PDSCH, respectively, except for specific control signals or specific service data. Information about which terminals (one or more terminals) PDSCH data is transmitted to and how those terminals must receive and decode PDSCH data is included in the PDCCH. Be transmitted. For example, RNTI (Radio Network Temporary) whose specific PDCCH is "A" It is CRC masked by Identity and transmitted using the radio resource "B" (eg frequency position) and the transmission format information "C" (eg transmission block size, modulation scheme, coding information, etc.). It is assumed that the information about the data to be transmitted is transmitted in a specific subframe. In this case, one or more terminals in the cell will monitor PDCCH using their own RNTI information, and if there is one or more terminals with "A" RNTI, they will The terminal receives the PDCCH and receives the PDSCH indicated by "B" and "C" using the received PDCCH information.
Figure 5 shows the control channels assigned to the downlink subframe. For systems of 3GPP Rel-11 and above, we decided to introduce a multi-node system with multiple connection nodes in the cell to improve performance (here, the multi-node system is DAS (Distributed Antenna System), RRH ( Radio Remote Head), Multi-node system, etc. are included, and are collectively referred to as RRH below). In addition, standardization work is underway to apply various MIMO and cooperative communication techniques that are already under development or applicable in the future to a multi-node environment. Basically, the introduction of RRH makes it possible to apply various communication techniques such as terminal / base station cooperation, and link quality (link). Quality) Improvement is expected, but the introduction of new control channels is urgently required to apply the various MIMO techniques and cooperative communication techniques described above to the multi-node environment. The control channel that is being discussed for introduction in response to this request is e-PDCCH (hereinafter, RRH-PDCCH, x-PDCCH, etc. are collectively referred to as e-PDCCH), and the existing allocation position is The data transmission area (hereinafter referred to as PDSCH area) is preferred over the control area (hereinafter referred to as PDCCH area). In conclusion, such e-PDCCH can be used to transmit control information about a node for each terminal, and the problem of lack of existing PDCCH area can be solved.
Traditional PDCCH is used for PDSCH, such as beamforming, MU-MIMO, and best band selection, only transmitted within a certain area using transmit diversity. The various techniques used were not applied. For this reason, PDCCH has been regarded as a bottleneck in system performance, and its improvement has been desired. In addition, RRH (remote radio) is newly added to improve system performance. While the introduction of head) is being debated, the need for a new PDCCH has emerged as a way to solve the PDCCH capacity shortage when the RRH cell IDs are the same. The PDCCH newly introduced in this way is referred to as an e-PDCCH to distinguish it from the existing PDCCH. The present invention is described assuming that the e-PDCCH is located within the PDSCH region. That is, the E-PDCCH and the PDSCH corresponding to the E-PDCCH have a structural feature that the control information can be transmitted in the data area by breaking away from the structure in which the control information should be transmitted in the control area in the existing subframe structure. ..
Referring to FIG. 5, the subframe is composed of 14 OFDM symbols. In the subframe, the first 3 OFDM symbols are used as the control area, and the remaining 11 OFDM symbols are used as the data area. In FIG. 5, R1 to R4 represent CRS for antennas 0 to 3. The CRS is fixed in a fixed pattern within the subframe regardless of the control area and the data area. Control channels are assigned to resources that are not CRS assigned in the control area, and traffic channels are also assigned to resources that are not assigned CRS in the data area. Control channels assigned to the control area include PCFICH, PHICH, and PDCCH.
PCFICH is a physical control format indicator channel that informs the terminal of the number of OFDM symbols used in PDCCH for each subframe. PCFICH is located at the first OFDM symbol. PCFICH consists of 4 REGs, and each REG is distributed in the control area based on the cell ID. One REG consists of four REs. The structure of the REG is as described above with reference to FIG. PCFICH indicates a value from 1 to 3 and is modulated by 16 QPSK (Quadrature Phase Shift Keying).
Figure 6 is an example of resource allocation using E-PDCCH.
With reference to FIG. 6, the e-PDCCH can generally be used by defining a part of the PDSCH area that transmits data, and the terminal blinds to detect the presence or absence of its own E-PDCCH. The decoding) process must be done. For the minimum area information for detecting e-PDCCH, it is advisable to newly define PDCCH or PCFICH in advance and notify it. The E-PDCCH performs the same scheduling operation (PDSCH, PUSCH control) as the existing PDCCH, but as the number of e-PDCCH allocated in the PDSCH area increases due to the increase in RRH connected terminals, the number of blind decoding increases, and the number of blind decoding increases. There is a problem that the complexity increases.
Figure 7 shows the R-PDCCH allocation structure for relays in an FDD system. In the specific allocation method of e-PDCCH, there is an approach method that tries to reuse the existing R-PDCCH structure. That is, e-PDCCH is a structure that inherits R-PDCCH. This has the advantage that the impact on existing standards can be relatively small by reusing the structure that has already been created. In the existing R-PDCCH, only the downlink (DL) grant is always assigned to the first slot (slot) of the existing RB, and the uplink (UL) grant is assigned to the second slot (slot). Or data PDSCH is assigned. However, there is a drawback that the DL grant must be decoded first. At this time, PDCCH area, CRS, DMRS (DE-Modulation Reference) Allocate R-PDCCH to RE excluding all of Signal). As shown in Table 1, DM-RS and CRS may all be used for R-PDCCH demodulation. When DM-RS is used, port 7 and scrambling ID (SCrambling ID, SCID) = 0 are used. .. On the other hand, when using a cell-specific reference signal (CRS), port 0 is used only when there is one PBCH transmission antenna, and when there are two or four PBCH transmission antennas. Is switched to the transmission (Tx) diversity mode, and ports 0 to 1 and ports 0 to 3 are all used.
<tables num="1"><img id="000003" he="103" wi="156" file="JP5719087B2_D0001.tif" img-format="tif" img-content="drawing" /></tables>
In the case of the R-PDCCH structure, the slots are divided, the downlink grant is assigned to the first slot, the uplink grant is assigned to the second slot, and the control channel is assigned to the first slot. That is, the downlink control channel R-PDCCH has a pure FDM structure assigned only to the first slot. However, the E-PDCCH allocation currently under discussion is not limited to one slot and is trying to be a full FDM structure.
In existing systems, the PDSCH start position of each cell may vary depending on the PDCCH area size of each cell, which the terminal knows by higher layer signaling or by reading the CFI of PCFICH. However, in a cell composed of Macro eNB and RRH, the terminal of RRH may receive PDSCH transmitted through some or all resources of the PDCCH region. Such a resource management method is possible when the terminal that should receive the PDCCH does not exist in the RRH coverage.
Therefore, the present invention proposes the signaling required to receive PDSCH in the PDCCH region as follows.
There is an urgent need to introduce a new control channel for application to a multi-node environment, and therefore, in order to enable transmission of control information about the node for each terminal, we propose a method that can solve the capacity shortage of PDCCH. .. Therefore, considering the distribution of legacy terminals operating based on the existing 3GPP LTE / LTE-A standard, we try to solve the problem that it is difficult to allocate all the control channel area for each terminal within the PDCCH area. .. Since the PDCCH area is insufficient, we try to allocate e-PDCCH in the PDSCH area. At this time, since the e-PDCCH area applied to each RRH is moved to the PDSCH area, the control information assigned to the PDCCH area is reduced. Therefore, in order to use the PDSCH area more widely, we propose the following measures for allocating PDSCH to a part of the existing CFI PDCCH area.
The first plan can be set to receive the resource allocation information of the PDSCH area by using the existing CFI and receiving a separate CFI (hereinafter referred to as CFI2). The existing CFI can be transmitted via PCFICH, but CFI2 for PDSCH transmission may be set by signaling separately.
FIG. 8 is a diagram showing an example of PDSCH transmission within a partial region of PDCCH according to the CFI and CFI2 settings of the present invention.
Referring to FIG. 8, the terminal receives a CFI (hereinafter referred to as CFI2) separate from the CFI of PCFICH. CFI that indicates the number of OFDM (Orthogonal Frequency Division Multiplexing) symbols that can be used for PDCCH (Physical Downlink Control Channel) transmission may be used as it is, or PDSCH (Physical) corresponding to E-PDCCH (enhanced Physical Data Control Channel) Downlink Shared Channel) A separate CFI2 may be set to indicate the start OFDM symbol information available for transmission.
The existing terminal receives a CFI, which means the number of OFDM symbols available for PDCCH transmission located at the first symbol of the subframe. In other words, for general existing terminals, CFI means the start information of the OFDM symbol of PDSCH.
For example, a CFI of "1" means PDSCH starts at the second OFDM symbol, and a CFI of "2" means PDSCH starts at the third OFDM symbol. Therefore, one of the information that existing terminals must know in order to receive PDSCH is CFI.
However, as proposed in the present invention, in order to make PDSCH receivable within the PDCCH region, CFI2 separate from CFI must be received. CFI2 is a parameter that determines the PDSCH starting OFDM symbol, which may directly represent the PDSCH starting OFDM symbol and represents the span of DCI of the PDCCH region reduced by the PDSCH. You may. That is, it may indicate how many OFDM symbols are reduced compared to the DCI span represented by the CFI. Therefore, depending on whether CFI and CFI2 are the same, the CFI information may not mean the start information of the PDSCH OFDM symbol.
CFI2 may be set independently of CFI, rather than representing how many OFDM symbols are reduced compared to the DCI span represented by CFI. Therefore, the starting OFDM symbol represented by CFI2 may, in the extreme, be the first OFDM symbol or be set before the OFDM symbol represented by CFI. That is, the starting OFDM symbol available for PDSCH transmission corresponding to the E-PDCCH may precede the OFDM symbol represented by the CFI. For example, CFI may be set to represent the third OFDM symbol and CFI2 may be set to represent the first OFDM symbol. Therefore, CFI2 can represent the OFDM symbol start information by system determination freely from the first OFDM symbol, separately from the existing CFI.
Therefore, the terminal may receive both CFI and CFI2, or only one of them. If the terminal reads the control channel in the PDCCH area and also reads the e-PDCCH, the CFI that indicates the number of OFDM symbols available for PDCCH transmission, and the start OFDM symbol information available for PDSCH transmission corresponding to the E-PDCCH. Both CFI2 must be received to indicate. Alternatively, if the terminal reads only the E-PDCCH but the starting OFDM symbol of the E-PDCCH changes depending on the size of the PDCCH region, CFI2 represents the number of symbols reduced by CFI with respect to CFI, so CFI and CFI2 Both must be received. On the other hand, the information in the PDCCH area is not read, and the start symbol (start) A terminal that reads only the E-PDCCH with a fixed symbol) need only receive CFI2. At this time, CFI2 has a smaller OFDM symbol index than CFI. That is, by allocating the PDSCH area to the existing PDCCH area using CFI2, the problem that the existing PDCCH area is insufficient can be solved. When allocating PDSCH to the PDCCH area, referring to FIG. 1, according to the current communication standard based on CAS, all antennas belonging to one base station control all terminals belonging to the cell of the base station. The channel is transmitted in the PDCCH area. According to the present invention, it is possible to allocate PDSCH to the PDCCH region, which is the control channel region. In this case, the non-RRH terminal assigned to the PDCCH area, eg, general control information for a hibernating terminal, may be lost due to interference from the PDSCH transmission corresponding to the E-PDCCH. However, the base station can transmit the DMRS of the control information to the terminal, and by adjusting the beam gain by precoding at each terminal, the influence of beamforming from the base station can be reduced. That is, the beam gain can be adjusted by using the convolution code to reduce the influence of beamforming by other antennas. Also, even if PDSCH is assigned to a part of the PDCCH area, it affects only 1 or 2 of the 12 symbols in the PDCCH area, and assigning PDSCH to PDCCH is not a problem.
Therefore, the present invention attempts to provide a method of determining the PDSCH region by CFI and CFI2 and receiving PDSCH from a base station based on the first CFI information or the second CFI information.
In the present invention, there are roughly two types of methods capable of transmitting CFI2 to a terminal. There is a method of transmitting CFI2 by higher layer signaling, for example, RRC signaling (signaling), and a method of inserting a CFI2 field in the contents of e-PDCCH. The method of transmitting CFI2 to the terminal by upper layer signaling does not require additional parameter addition or modification work to the existing physical layer. On the other hand, the method of notifying CFI2 using e-PDCCH can immediately reflect the changes in the dynamic PDCCH or PDSCH area to the terminal. Alternatively, CFI2 may have the same value as CFI transmitted by the existing PCFICH. If the CFI is a fixed value, for example, if the start symbol of the PDSCH corresponding to the E-PDCCH is fixed, the method of inserting the CFI2 field in the content of the e-PDCCH can be used.
The second plan considers CFI and CFI2 and attempts to identify the environment in which PDSCH transmission is performed within the PDCCH domain. That is, we propose a specific range to which the first plan can be applied.
Among the 10 subframes (subframes) # 0 to # 9 in one frame, some subframes have features such as the control channel for terminals whose position is not grasped being transmitted in the PDCCH area. There is a frame. For example, subframes {# 0, # 4, # 5, # 9} are used for paging channel transmission. Information about the paging channel is transmitted on the data channel, and shared information is transmitted in the common search space area. In the present invention, it is assumed that each terminal has the same cell ID, and C-RNTI (cell-Radio Network Temporary) is used in the PDCCH region. Identity) The control signal of each terminal is scrambled and transmitted using one. In this case, the first initiative is not applied in order to protect the control signal of the terminal that uses the paging channel. That is, the base station does not allocate the PDSCH area by CFI2 for data transmission, and uses only the existing CFI value so that the PDCCH area is not changed. Alternatively, the terminal ignores CFI2 and uses only CFI to obtain the assigned RE information. The receiving terminal of the paging channel is in hibernation mode (idle) Since it is in mode), the position cannot be grasped and PDSCH of other terminals cannot be transmitted in the PDCCH area. In this way, in some subframes that have features such as the control channel for terminals whose position is not grasped being transmitted in the PDCCH area, the PDSCH start OFDM symbol indicated by CFI2 is the PDSCH indicated by CFI. Must be identical to the start OFDM symbol of, otherwise cause the terminal to ignore CFI2. In other words, for some subframes that have features such as the transmission of control channels for hibernating terminals that are terminals that receive paging channels, CFI2 is not applied and only CFI is applied for PDSCH. Receive from the base station. When the second method is applied, the subframe in which the base station and the terminal should perform such an operation may be fixed to a specific subframe as in the above example, and is instructed to the terminal by upper layer signaling. You may.
9 and 10 are diagrams showing an embodiment of RE mapping of PDSCH of the present invention.
Referring to FIG. 9, when PDSCH is RE-mapped, it is mapped to the allocated resource in the PDSCH area in the existing method, and then mapped to the allocated resource in the PDCCH area. RE mapping is performed along the frequency axis from the first OFDM symbol in the allocated resource area, then moves to the next OFDM symbol and repeats the same RE mapping. For example, as shown in FIG. 9, PDSCH is RE-mapped from OFDM symbol indexes 3 to 13 and RE-mapped to OFDM symbol index 2. That is, RE mapping is performed from the PDSCH area based on the existing CFI value, and when the CFI value is not the same as the CFI2 value, RE mapping is further performed from the start position of the PDSCH area by CFI2 by the circular method. Therefore, if the mapping shown in FIG. 9 is performed, the existing buffer can be used as it is.
With reference to FIG. 10, when the PDSCH is RE-mapped, the RE mapping in the existing PDSCH area is performed in order from the start symbol in the PDCCH area. RE mappings ring is carried out along a frequency axis from the first OFDM symbol of the allocated resource region, repeating the same RE mapping proceeds to the next OFDM symbol.
Therefore, the RE mapping of the PDSCH of the present invention may be mapped by the existing CFI (1) and then remapped from the starting OFDM symbol position by CFI2 (2), as shown in FIG. Alternatively, the invention may be mapped from the starting OFDM symbol position by CFI2, as shown in FIG. The mapping rules shown in FIGS. 9 and 10 do not differ in terms of performance such as interference, and depend on the selection of the base station.
The terminal already knows the start position of the PDSCH region by CFI or CFI2, and receives the mapped RE information according to the mapping rules of FIGS. 9 and 10 from the base station.
FIG. 11 illustrates a base station and a terminal applicable to an embodiment of the present invention.
The terminal operates as a transmitting device on the uplink and as a receiving device on the downlink. On the contrary, the base station can operate as a receiving device on the uplink and as a transmitting device on the downlink.
Referring to FIG. 11, the wireless communication system includes a base station (BS) 110 and a terminal (UE) 120. Base station 110 includes processor 112, memory 114 and radio frequency (Radio). Frequency, RF) Unit 116 is provided. Processor 112 may be configured to embody the procedures and / or methods proposed in the present invention. The processor 112 may control the radio frequency unit to transmit a first CFI information indicating the number of OFDM symbols available for PDCCH transmission to the terminal. Alternatively, the processor 112 may control the radio frequency unit to send a second CFI information to the terminal indicating the start OFDM symbol information available for PDSCH transmission corresponding to the E-PDCCH. Alternatively, the processor 112 may be configured to use the first CFI information and the second CFI information to control the radio frequency unit to transmit the PDSCH to the terminal. Here, the PDCCH can be located in the PDCCH region of the downlink subframe, and the E-PDCCH can be located in the PDSCH region of the downlink subframe. Alternatively, in the processor 112, the first CFI information is RRC (Radio Resource). Control) Controls the radio frequency unit so that it is transmitted to the terminal by signaling, and the radio frequency unit is transmitted to the terminal by RRC signaling or included in the E-PDCCH. May be configured to control. Alternatively, processor 112 may control the radio frequency unit to transmit the PDSCH to the terminal based solely on the first CFI information if the control channel for the hibernating terminal is a subframe to be transmitted. It may be configured. Here, the second CFI information represents the number of OFDM symbols that are relatively reduced as compared with the first CFI information. The memory 114 is connected to the processor 112 and stores various information related to the operation of the processor 112. The RF unit 116 is connected to the processor 112 to transmit and / or receive radio signals. Terminal 120 includes processor 122, memory 124 and RF unit 126. Processor 122 may be configured to embody the procedures and / or methods proposed in the present invention. Processor 122 may control RF unit 126 to receive first CFI information from the base station that indicates the number of OFDM symbols available for PDCCH transmission. Alternatively, the processor 122 may control the RF unit 126 to receive a second CFI information from the base station indicating the start OFDM symbol information available for PDSCH transmission corresponding to the E-PDCCH. Alternatively, the processor 122 may be configured to control the radio frequency unit to receive the PDSCH from the base station based on the first CFI information or the second CFI information. The processor 122 controls the radio frequency unit to receive the first CFI information from the base station by RRC signaling, and receives the second CFI information from the base station by RRC signaling, or is included in the E-PDCCH. It may be configured to control the radio frequency unit to receive. Alternatively, processor 122 is for a dormant terminal. If the control channel is a transmitted subframe, it may be configured to control the radio frequency unit to receive the PDSCH from the base station based solely on the first CFI information. The memory 124 is connected to the processor 122 and stores various information related to the operation of the processor 122. The RF unit 126 is connected to the processor 122 to transmit and / or receive radio signals. The base station 110 and / or the terminal 120 has a single antenna or multiple antennas.
In the examples described above, the components and features of the present invention are combined into a predetermined form. Each component or feature should be considered as selective unless otherwise explicitly mentioned. Each component or feature may be implemented in a form that is not combined with other components or features, or some components and / or features may be combined to form an embodiment of the invention. The order of operations described in the examples of the present invention may be changed. A partial configuration or feature of one embodiment may be included in another embodiment or may replace the corresponding configuration or feature of another embodiment. It is clear that in the claims, claims that are not explicitly cited can be combined to form an example, or can be included as a new claim by post-application amendment.
The embodiments according to the present invention can be embodied by various means such as hardware, firmware, software or a combination thereof. In the case of hardware implementation, one embodiment of the present invention includes one or more ASICs (application specific integrated circuits), DSPs (digital signal processors), DSPDs (digital signal processing devices), PLDs (programmable logic devices). ), FPGAs (field programmable gate arrays), processors, controllers, microcontrollers, microprocessors, etc.
In the case of realization by firmware or software, one embodiment of the present invention may be embodied in the form of a module, procedure, function or the like that performs the function or operation described above. The software code may be stored in a memory unit and driven by a processor. The memory unit may be provided inside or outside the processor, and data may be exchanged with the processor by various means already known.
It is obvious to those skilled in the art that the present invention may be embodied in another particular form without departing from the features of the present invention. Therefore, the above detailed description should not be construed in a restrictive manner in any respect and should be considered as exemplary. The scope of the present invention should be determined by a reasonable interpretation of the appended claims, and any modification within the equivalent scope of the present invention is within the scope of the present invention.
The present invention can be used for terminals, base stations, or other equipment of wireless mobile communication systems. Specifically, the present invention can be used in a multi-node system that provides a communication service to a terminal via a plurality of nodes.
13 sheets
Sheet 1 Sheet 2 Sheet 3 Sheet 4 Sheet 5 Sheet 6 Sheet 7 Sheet 8 Sheet 9 Sheet 10 Sheet 11 Sheet 12 Sheet 13
Every citation, both ways
| Document | Relation | Office | Cited during |
|---|---|---|---|
| US2022086840A1 | Cited by | United States of America | Search report |
| US11533729B2 | Cited by | United States of America | Search report |
| KR1020110072063A | Cites | Republic of Korea | – |
| JP2012508483A | Cites | Japan | – |
| JP2012514361A | Cites | Japan | – |
| WO2011025202A2 | Cites | World Intellectual Property Organization (WIPO) | – |
| WO2011037439A2 | Cites | World Intellectual Property Organization (WIPO) | – |
14 members in 5 offices
Priority claims9
| Document | Office | Kind | Date |
|---|---|---|---|
| 201161507607 | United States of America | P | |
| 201161507607 | United States of America | P | |
| 61507607 | United States of America | – | |
| 2012004390 | Republic of Korea | W | |
| 2012004390 | Republic of Korea | W | |
| 61507607 | – | – | – |
| KR2012004390 | – | – | – |
| US201161507607P | – | – | – |
| WO2012KR04390 | – | – | – |
Members14
| Document | Office | Kind | |
|---|---|---|---|
| WO2013009005A2 | World Intellectual Property Organization (WIPO) | A2 | |
| WO2013009005A3 | World Intellectual Property Organization (WIPO) | A3 | |
| KR20140036186A | Republic of Korea | A | |
| CN103703706A | China | A | |
| JP2014523676A | Japan | A | |
| JP5719087B2This record | Japan | B2 | |
| US2015163771A1 | United States of America | A1 | |
| US9198176B2 | United States of America | B2 | |
| US2016044643A1 | United States of America | A1 | |
| US9544893B2 | United States of America | B2 | |
| US2017079022A1 | United States of America | A1 | |
| CN103703706B | China | B | |
| US10034282B2 | United States of America | B2 | |
| KR102040616B1 | Republic of Korea | B1 |
15 legal events, as the office reported them to INPADOC
Over the term
Point at a mark for the eventEvents
| Event | Code | |
|---|---|---|
| Receipt of annual feesJAPANESE INTERMEDIATE CODE: R250R250 | R250 | |
| Receipt of annual feesJAPANESE INTERMEDIATE CODE: R250R250 | R250 | |
| Receipt of annual feesJAPANESE INTERMEDIATE CODE: R250R250 | R250 | |
| Receipt of annual feesJAPANESE INTERMEDIATE CODE: R250R250 | R250 | |
| Receipt of annual feesJAPANESE INTERMEDIATE CODE: R250R250 | R250 | |
| Receipt of annual feesJAPANESE INTERMEDIATE CODE: R250R250 | R250 | |
| Receipt of annual feesJAPANESE INTERMEDIATE CODE: R250R250 | R250 | |
| Receipt of annual feesJAPANESE INTERMEDIATE CODE: R250R250 | R250 | |
| Receipt of annual feesJAPANESE INTERMEDIATE CODE: R250R250 | R250 | |
| Certificate of patent or registration of utility modelJAPANESE INTERMEDIATE CODE: R150R150 | R150 | |
| First payment of annual fees (during grant procedure)JAPANESE INTERMEDIATE CODE: A61A61 | A61 | |
| Written decision to grant a patent or to grant a registration (utility model)JAPANESE INTERMEDIATE CODE: A01A01 | A01 | |
| Decision of grant or rejection writtenTRDD | TRDD | |
| Request for written amendment filedJAPANESE INTERMEDIATE CODE: A523A521 | A521 | |
| Notification of reasons for refusalJAPANESE INTERMEDIATE CODE: A131A131 | A131 |
Numbers
- Publication
- 5719087
- Publication, DOCDB
- 5719087
- Publication, EPODOC
- JP5719087B
- Application
- 2014516894
- Application, DOCDB
- 2014516894
- Application, EPODOC
- JP20140516894
Titles2
- Japanese
- 無線通信システムにおいてリソースを割り当てる方法及びそのための装置
- English
- How to allocate resources in wireless communication systems and devices for that
Classification
- CPC, 8
- H04L5/0037
- H04J11/0023
- H04W72/23
- H04L5/0048
- H04L5/0053
- H04B7/2612
- H04L5/0007
- H04W72/12
- IPC, 3
- H04J99 00
- H04J11 00
- H04L27 26
