KR20120119997A - Method of transmitting or receiving MIMO feedback information in wireless communication system, and mobile station and base station - Google Patents

Abstract

PURPOSE: An MIMO(Multiple-Input Multiple-Output) feedback information transmission and reception method in a wideband wireless communication system and base station are provided to enable an M2M apparatus to rapidly enter into a network according to a network entering method. CONSTITUTION: When a corresponding terminal is a fixed M2M apparatus, a base station adds an MIMO feedback information to a ranging request message(S302). The base station transmits the ranging request message to the terminal(S303). The terminal receives a ranging response message from the base station. The terminal executes a remaining network entering process or a remaining re-entering network process(S305). When the terminal is not the fixed M2M apparatus, the terminal executes the existed normal network entering process or the existed normal re-entering process(S304). [Reference numerals] (S301) Starting network entering procedure; (S302) When a corresponding terminal is a fixed M2M apparatus, a base station adds an MIMO feedback information to a ranging request message; (S303) The base station transmits the ranging request message to the terminal; (S304) When the terminal is not the fixed M2M apparatus, the terminal executes the existed normal network entering process or the existed normal re-entering process; (S305) The terminal executes a remaining network entering process or a remaining re-entering network process

Description

Method for transmitting or receiving MIMO feedback information in wireless communication system, and mobile station and base station in a broadband wireless communication system

The present invention is a method for transmitting and receiving MIMO feedback information for a terminal in a broadband wireless communication system.

A multiple input multiple output (MIMO) scheme refers to a method of increasing system capacity by simultaneously transmitting several data streams (or layers) spatially using two or more transmit / receive antennas in a base station and a terminal. The MIMO scheme includes transmit diversity, spatial multiplexing, or beamforming.

The transmit diversity scheme has the advantage that highly reliable data transmission can be realized without transmitting channel related feedback information from the receiver by transmitting the same data information through a plurality of transmit antennas. Beamforming is used to increase the signal to interference plus noise ratio (SINR) of a receiver by multiplying a plurality of transmit antennas by appropriate weights. Generally, in a Frequency Division Duplexing (FDD) system, Since the channel is independent, reliable channel information is needed to obtain a proper beamforming gain, and therefore, it receives separate feedback from the receiver.

Meanwhile, the spatial multiplexing scheme can be distinguished by a spatial multiplexing scheme for a single user and multiple users. Spatial multiplexing for a single user is called SM (Spatial Multiplexing) or SU-MIMO (Single User MIMO), and is a method for allocating a plurality of antenna resources of a base station to one user (terminal) It increases in proportion to the number. Meanwhile, spatial multiplexing for multiple users is called SDMA (Spatial Divisional Multiple Access) or MU-MIMO (Multi-User MIMO), and a method of distributing a plurality of antenna resources or wireless spatial resources of a base station to a plurality of users to be.

In case of using the MIMO scheme, a single codeword (SCW) scheme for transmitting N data streams (or layers) simultaneously transmitted using one channel encoding block and M data streams in which M (N = N) There is a multiple codeword (MCW) scheme for transmitting using) channel encoding blocks. At this time, each channel encoding block generates an independent codeword (CodeWord; CW), and each codeword is designed to be capable of independent error detection.

Machine-to-machine communication (M2M) refers to communication between the electronic device and the electronic device as it is. Broadly speaking, it refers to a wired or wireless communication between electronic devices or a communication between a device and a machine controlled by a person. Recently, however, it is generally referring to wireless communication between an electronic device and an electronic device, that is, device-to-device performed without human involvement.

In the early 1990s, when the concept of M2M communication was first introduced, it was recognized as a concept of remote control or telematics, and the market itself was very limited. However, in the past few years, M2M communication has been rapidly gaining worldwide attention. Grew. In particular, intelligent metering that measures flow management, remote monitoring of machinery and equipment, operating hours on construction machinery and automatic measurement of heat or electricity usage in point-of-sales and security-related applications. It showed great influence in the field of (Smart Meter). M2M communication in the future will be utilized for more various purposes in connection with existing mobile communication and wireless high-speed Internet, or low-power communication solutions such as Wi-Fi and Zigbee, and will no longer be limited to the business-to-business market. It will be the foundation to expand into the market.

In the M2M era, any machine equipped with a Subscriber Identity Module (SIM) card can transmit and receive data for remote management and control. For example, M2M communication technology can be used in numerous devices and equipment such as automobiles, trucks, trains, containers, vending machines, gas tanks, and the like.

In the related art, it is common to manage terminals in individual units, so that communication between the base station and the terminals is performed in a one-to-one communication scheme. Assuming that many M2M devices communicate with the base station in this one-to-one communication scheme, network overload due to signaling occurring between each of the M2M devices and the base station is expected.

An object of the present invention is to provide a method and apparatus for a M2M (Machine to Machine) device to communicate with a base station.

An object of the present invention is to provide a method and apparatus for a base station to communicate with a machine to machine (M2M) device.

Another technical problem to be achieved in the present invention is to provide a machine to machine (M2M) device for communicating with the base station.

Another technical problem to be achieved in the present invention is to provide a base station for communicating with a machine to machine (M2M) device.

In one aspect of the present invention, in the terminal transmits multiple input multiple output (MIMO) feedback information, transmitting a ranging request message to the base station; And receiving a ranging response message according to the ranging request message from the base station, wherein the terminal is a fixed machine to machine (M2M) device and the ranging request message includes MIMO feedback information. A method of transmitting MIMO feedback information is provided.

In another aspect of the present invention, in a wireless communication system, the terminal transmits multiple input multiple output (MIMO) feedback information, the receiver; transmitter; And a processor configured to control the receiver and the transmitter, wherein the processor controls the transmitter to transmit a ranging request message to a base station, and the receiver to receive the ranging response message according to the ranging request message. The terminal device is controlled, and the terminal is a fixed M2M device, and the ranging request message includes MIMO feedback information.

In still another aspect of the present invention, in the wireless communication system, when the base station receives multiple input multiple output (MIMO) feedback information from the terminal, receiving a ranging request message from the terminal; And transmitting a ranging response message to the terminal by using the ranging request message, wherein the terminal is a fixed M2M device and the ranging request message includes MIMO feedback information. An information receiving method is provided.

In still another aspect of the present invention, in a wireless communication system, a base station receives multiple input multiple output (MIMO) feedback information from a terminal; transmitter; And a processor configured to control the receiver and the transmitter, wherein the processor controls the receiver to receive a ranging request message from the terminal, and sends a ranging response message to the terminal using the ranging request message. And controlling the transmitter to transmit, the terminal is a fixed M2M device, and the ranging request message includes MIMO feedback information.

Preferably, the MIMO feedback information is new MIMO feedback information obtained by newly measuring a downlink channel from the base station.

Preferably, the MIMO feedback information is MIMO feedback information that the terminal most recently transmitted to the base station.

Preferably, the MIMO feedback information is information including one or more of an MFM bitmap, a channel quality indicator (CQI), a space time coding (STC), and a preferred matrix index (PMI).

According to various embodiments of the present disclosure, the present invention relates to a method for quickly applying a downlink modulation and coding scheme (MCS) and a MIMO mode of a terminal when an idle mode terminal reenters a network.

According to the present invention, according to the network entry / reentry method, the M2M device may quickly perform network entry / reentry to a base station.

According to the present invention, an overhead of unnecessary downlink control information can be reduced.

According to the present invention, it is possible to save the resources of the feedback channel while maintaining the transmission rate of the conventional transmitting station. In addition, an optimal transmission rate may be implemented at the transmitting end.

That is, according to the present invention, it is possible to provide an improved AMC scheme which improves performance degradation of the AMC scheme due to inaccuracy of channel quality information and unnecessary feedback transmission under a user's mobile environment.

The effects obtained by the present invention are not limited to the above-mentioned effects, and other effects not mentioned can be clearly understood by those skilled in the art from the following description will be.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included as part of the detailed description in order to provide a thorough understanding of the present invention, provide embodiments of the present invention and together with the description, describe the technical idea of the present invention.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view for explaining a configuration of a device such as an M2M device and a base station according to an embodiment of the present invention;
2 is a view showing a network entry procedure performed by a terminal according to an embodiment of the present invention;
3 is a diagram illustrating a network entry procedure performing process of a base station according to one embodiment of the present invention;
4 is a diagram illustrating a network entry procedure performed by a terminal according to another embodiment of the present invention;
5 is a diagram illustrating a network entry procedure performing process of a terminal according to another embodiment of the present invention;
6 is a diagram illustrating a network entry procedure performing procedure of a terminal according to another embodiment of the present invention;
7 is a diagram illustrating a process of performing a network entry procedure of a terminal according to another embodiment of the present invention;
8 is a diagram illustrating a network entry procedure performing process of a terminal according to another embodiment of the present invention;
9 is a diagram illustrating a network entry procedure performing procedure of a terminal according to another embodiment of the present invention;
10 is a view showing a network entry procedure performed by a terminal according to another embodiment of the present invention;
11 is a diagram illustrating a process of performing a network entry procedure between a terminal and a base station according to an embodiment of the present invention;
12 is a diagram illustrating a network entry procedure performing procedure between a terminal and a base station according to another embodiment of the present invention; and
13 is a diagram illustrating a process of performing a network entry procedure between a terminal and a base station according to another embodiment of the present invention.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following detailed description, together with the accompanying drawings, is intended to illustrate exemplary embodiments of the invention and is not intended to represent the only embodiments in which the invention may be practiced. The following detailed description includes specific details in order to provide a thorough understanding of the present invention. However, those skilled in the art will appreciate that the present invention may be practiced without these specific details.

On the other hand, in some cases, well-known structures and devices are omitted or shown in block diagram form around the core functions of each structure and device in order to avoid obscuring the concept of the present invention. In addition, the same components will be described with the same reference numerals throughout the present specification.

In the following description, it is assumed that the UE collectively refers to a mobile stationary or stationary user equipment such as a UE (User Equipment), an MS (Mobile Station), an AMS (Advanced Mobile Station), and an M2M (Machine to Machine) It is also assumed that the base station collectively refers to any node at a network end that communicates with a terminal such as a Node B, an eNode B, a base station, an Advanced Base Station (ABS), and an Access Point (AP). Although the present invention is described based on IEEE 802.16e / m, the contents of the present invention are also applicable to other communication systems such as 3GPPL LTE and LTE-A systems.

Hereinafter, communication between M2M devices means information exchange performed through the base station, between the terminals, or between the base station and the terminals without human intervention. Accordingly, the M2M device refers to a terminal capable of supporting communication of the M2M device as described above. An access service network for an M2M service is defined as an M2M ASN (M2M Access Service Network), and a network entity communicating with M2M devices is called an M2M server. The M2M server executes an M2M application and provides an M2M specific service for one or more M2M devices. An M2M feature is a feature of an M2M application, and one or more features may be needed to provide the application. An M2M device group refers to a group of M2M devices that share one or more features in common.

Devices communicating in an M2M manner (which may be variously called M2M devices, M2M communication devices, etc.) will gradually increase in a certain network as the machine application type increases. The types of device applications under discussion include (1) security, (2) public safety, (3) tracking and tracing, (4) payment, and (5) healthcare. health care, (6) remote maintenance and control, (7) metering, (8) consumer devices, (9) point of sales (POS) and In the security-related application market, Logistics Management, (10) Vending Machine-to-Vending Machine Communication, (11) Remote Monitoring of Machines and Facilities, Hours of Operation on Construction Machinery Equipment and Automatic Measurement of Heat or Electricity Usage Smart Meter, (12) Surveillance Video communication of a surveillance camera, etc., but need not be limited thereto, and various device application types have been discussed.

As the device application type increases, the number of M2M communication devices may increase dramatically compared to the number of general mobile communication devices. Depending on the characteristics of the M2M device, there is a point in which traffic is transmitted to the base station in a long-term or periodic manner, or an event is triggered to transmit data. That is, most of the M2M device can remain in the idle mode and wake up when the cycle returns or the event is triggered to enter the active state. In addition, depending on the characteristics of the M2M device, some M2M devices (eg, metering or vending machines) may have low mobility or no mobility. Significantly less or no mobility means that M2M devices are stationary for a long time. M2M communication systems are M2M devices with fixed locations such as secured access and surveillance, public safety, payment, remote maintenance and control, metering, etc. It may simplify or optimize mobility-related operations for a particular M2M application related to. Other M2M devices (eg, associated with M2M applications such as tracking and tracing or Fleet Management) may be highly mobile. As the application types of M2M devices continue to increase, there will be numerous such M2M devices in the same base station. Accordingly, the base station needs to smoothly support random access of a myriad of M2M terminals that remain idle.

Hereinafter, an embodiment of the present invention will be described by exemplifying a case where M2M communication is applied to IEEE 802.16e / m. However, the present invention is not limited thereto, and the embodiment of the present invention may be applied to other systems such as 3GPP LTE system in the same manner.

1 is a diagram for schematically explaining a device configuration such as an M2M device and a base station according to an embodiment of the present invention.

In FIG. 1, the M2M device 100 (or may be referred to as an M2M communication device, hereinafter referred to as an M2M device) and the base station 150 are RF units 110 and 160, processors 120 and 170, and optionally, respectively. Memory 130 and 180. In addition, each of the RF units 110 and 160 may include transmitters 111 and 161 and receivers 112 and 162. For example of the M2M device 100, the transmitter 111 and the receiver 112 are configured to transmit and receive signals with the base station 150 and other M2M devices, and the processor 120 is the transmitter 111 and the receiver. Functionally connected to 112, the transmitter 111 and the receiver 112 may be configured to control a process of transmitting and receiving signals with other devices. In addition, the processor 120 may perform various types of processing on the signal to be transmitted and then transmit the signal to the transmitter 111, and may perform processing on the signal received by the receiver 112. If necessary, the processor 120 may store information included in the exchanged message in the memory 130. With such a structure, the M2M device 100 may perform the methods of the various embodiments described below. Although not shown in FIG. 1, the M2M device 100 may include various additional configurations according to the device application type. When the M2M device 100 is for intelligent metering, the M2M device 100 may include an additional configuration for power measurement, and the like. The power measurement operation may be performed by the processor 120 illustrated in FIG. 1. May be controlled, or may be controlled by a separately configured processor (not shown).

1 illustrates an example in which communication is performed between the M2M device 100 and the base station 150, the M2M communication method according to the present invention may occur between M2M devices, and each of the devices is shown in FIG. 1. The method according to various embodiments described below may be performed in the same form as each device configuration shown in FIG.

Transmitter 161 and receiver 162 of base station 150 are configured to transmit and receive signals with other base stations, M2M servers, and M2M devices, and processor 170 is functional with transmitter 161 and receiver 162. Connected to, the transmitter 161 and the receiver 162 may be configured to control the process of transmitting and receiving signals with other devices. In addition, the processor 170 may perform various processing on the signal to be transmitted, transmit the signal to the transmitter 161, and may perform processing on the signal received by the receiver 162. If necessary, the processor 170 may store information included in the exchanged message in the memory 130. With this structure, the base station 150 may perform the methods of the various embodiments described above.

Processors 120 and 170 of each of the M2M device 110 and the base station 150 instruct (eg, control, coordinate, manage, etc.) operation at the M2M device 110 and the base station 150, respectively. Each of the processors 120 and 170 may be connected to memories 130 and 180 that store program codes and data. The memories 130 and 180 are coupled to the processors 120 and 170 to store operating systems, applications, and general files.

The processors 120 and 170 may also be referred to as a controller, a microcontroller, a microprocessor, a microcomputer, or the like. The processors 120 and 170 may be implemented by hardware or firmware, software, or a combination thereof. (DSP), digital signal processing devices (DSPDs), programmable logic devices (PLDs), and the like may be used to implement embodiments of the present invention using hardware, , FPGAs (field programmable gate arrays), and the like may be provided in the processors 120 and 170.

Meanwhile, when implementing embodiments of the present invention using firmware or software, the firmware or software may be configured to include a module, a procedure, or a function for performing the functions or operations of the present invention, and to perform the present invention. Firmware or software configured to be may be included in the processors 120 and 170 or may be stored in the memories 130 and 180 to be driven by the processors 120 and 170.

As described above, when M2M communication is rapidly spread and widened, overhead due to communication between these M2M devices or between M2M devices and a base station may be a problem. Accordingly, in order to efficiently solve this overhead problem in consideration of the characteristics of the M2M communication method, it is necessary to efficiently allocate resource allocation of the M2M device. Therefore, a method for reducing unnecessary MAP overhead is proposed.

Adaptive Modulation and Coding (AMC) is a method of dynamically changing a modulation and coding scheme (MCS) according to a channel state. In general, the receiver observes the channel condition to select the appropriate MCS and feeds the MCS back to the transmitter. According to the AMC scheme, a change in channel quality due to multipath fading or user movement can be compensated to some extent. One common criterion used to determine MCS is to estimate channel quality. Channel quality is estimated to select the optimal MCS that can maximize the rate under the target quality of service (QoS) constraints. In general, channel quality uses a large signal-to-noise ratio (SNR).

In general, techniques that improve the performance of the system through feedback, including AMC, show the best performance when receiving feedback information such as channel status and user's moving speed from the receiver whenever data transmission is performed. However, if feedback information is transmitted every time data is transmitted, the feedback channel is overloaded so that channel resources cannot be effectively distributed, particularly in a multiple access system.

In order to solve this problem, a method of performing feedback according to a preset period without considering the channel situation has been conventionally proposed. However, in this method, even when the channel or user's moving speed does not change significantly, feedback information must be calculated and transmitted at a predetermined period, which causes unnecessary load on the receiver and feedback channel. In addition, in the conventional method, even in a situation where a channel or user's moving speed is greatly changed, the system does not receive feedback information and thus needs to use previous feedback information.

Accordingly, there is a need for a method for effectively reducing the amount of information fed back while maintaining the throughput of the transmitter compared to the conventional feedback method.

2 is a diagram illustrating a process of performing network entry (or reentry) between a terminal and a base station in an existing IEEE802.16m system.

In FIG. 2, after the UE performs network entry or reentry, the BS transmits a feedback allocation A-MAP IE or a feedback polling A-MAP IE to the UE, thereby providing a fast feedback control channel required by the UE. channel). The terminal transmits feedback information related to multiple input multiple output (MIMO) and channel state to the base station through the allocated feedback channel. The base station determines the downlink (DL) MIMO mode or the MCS of the terminal and sets the appropriate value when allocating resources using the MIMO information received from the terminal. The base station allocates an uplink control channel (UL CCH) to a feedback channel using a feedback allocation A-MAP IE to a user equipment, and uses an uplink common channel (UL SCH) or an uplink control channel using a feedback polling A-MAP IE. The header of (UL CCH) is allocated to the feedback channel.

Referring to FIG. 2, the terminal transmits initial ranging or handover ranging to the base station (hereinafter, it is assumed that the terminal transmits initial ranging). Initial ranging is a process for the UE to obtain an accurate timing offset with the base station and to initially adjust the transmission power. Typically, when the terminal is powered on, the terminal acquires downlink synchronization from the received downlink preamble signal. Subsequently, the terminal performs initial ranging to adjust uplink timing offset and transmit power. After selecting the ranging channel, the terminal selects the ranging preamble code from the initial ranging domain and transmits the selected ranging preamble code to the base station through the selected ranging channel (S201).

Thereafter, the base station may transmit an acknowledgment response message for the initial ranging or handover ranging transmission of the terminal to the terminal (S202). Here, the response message may be defined as a ranging confirmation (AAI-RNG-ACK) message. A ranging acknowledgment (AAI-RNG-ACK) message is a message that provides a response that all ranging preamble codes have been successfully received and detected at every ranging opportunity. The base station may transmit three possible ranging states for initial ranging or handover ranging in an AAI-RNG-ACK message to the terminal. Here, three possible ranging states included in the AAI-RNG-ACK message include a "continue" state, a "success" state, and an "abort" state.

When the ranging state for the initial ranging or the handover ranging is a "success" state, the base station allocates information necessary for transmitting a ranging request (AAI-RNG-REQ) message to the UE by CDMA allocation A-MAP IE (CDMA). Allocation A-MAP IE). That is, the base station provides uplink resource allocation information for transmitting a ranging request to the terminal through a CDMA Allocation A-MAP IE (CDMA Allocation A-MAP IE) message. When the terminal transmits the ranging to the base station, the base station may transmit the uplink resource information allocated for the transmission of the ranging request message to the terminal through a resource index field. If the terminal receives the CDMA Allocation A-MAP IE (CDMA Allocation A-MAP IE) from the base station, the terminal transmits a message requesting ranging to the base station (S203). Thereafter, the terminal may receive the ranging response message in response to the ranging request message from the base station (S204). The terminal may transmit the SBC-REQ message to the base station, and the terminal may receive the SBC-RSP message to the base station (S205 and S206). The terminal may transmit a registration request (REG-REQ) message to the base station, and the terminal may receive a registration response (REG-RSP) message to the base station (S207 and S208). The base station provides uplink resource allocation information for transmitting a ranging request to the terminal through a CDMA Allocation A-MAP IE (CDMA Allocation A-MAP IE) message (S209). The terminal may transmit channel and MIMO feedback information to the base station (S 210).

However, in the M2M system, most M2M devices such as smart metering or bending machines are in a fixed position without moving. The channel state of these fixed M2M devices is almost unchanged and remains mostly constant. If there is little change in the channel of the terminal, the MCS (DIUC: Downlink Interval Usage Code / DIUC) or MIMO information (for example, Matrix information) used by the terminal will not be changed for a long time. In this case, the base station allocates resources for periodic feedback to the fixed terminal through Feedback allocation A-MAP IE or feedback polling A-MAP IE, which increases unnecessary feedback overhead and causes the terminal to allocate a feedback channel to the base station. And until the MIMO feedback information is uploaded, the base station does not quickly set the MIMO mode of the UE, thereby lowering scheduling efficiency.

Therefore, a method for reducing unnecessary MAP overhead when allocating resources in fixed terminals is required. Hereinafter, an embodiment of the present invention will be described by exemplifying a case where M2M communication is applied to an IEEE 802.16m system.

Referring to FIG. 2, after the terminal performs network entry or reentry through a ranging process, the terminal feeds back an assigned feedback channel related to a multiple input multiple output (MIMO) and a channel state. Sends feedback information to the base station.

However, in the case of a fixed M2M terminal, since the channel state is almost unchanged and is mostly kept constant, resource allocation for feedback periodically causes an unnecessary overhead increase. Therefore, in the present invention, when the terminal enters the network, the ranging request message may include MIMO feedback information and may be transmitted.

3 is a diagram illustrating a process of performing feedback when a fixed M2M device performs network entry (or reentry) according to the present invention. Provided is a method for increasing scheduling efficiency by quickly using a MIMO mode of an M2M device using the feedback information. For the present invention, when the terminal performs network entry (or re-entry), when transmitting a ranging request (AAI-RNG-REQ) message, MIMO feedback information in the ranging request (AAI-RNG-REQ) message Include and transmit to the base station. Here, the MIMO feedback information includes information on which MIMO feedback mode (MFM) the UE can support and channel quality indicator (CQI), space time coding (STC), Represents information including one or more of the preferred matrix index (PMI). When the base station receives a ranging request (AAI-RNG-REQ) message including the MIMO feedback information from the fixed terminal, the base station is MCS and MIMO when transmitting downlink data (or burst) based on the information received from the terminal Set the information appropriately. In particular, when transmitting the AAI-RNG-RSP in response to receiving the ranging request (AAI-RNG-REQ) message, MCS and MIMO information for the corresponding burst transmission is appropriately set using the information received from the terminal. In order to set the MCS and MIMO information for the burst including the AAI-RNG-RSP, the MIMO information and the MCS information are included in the CDMA-Allocation A-MAP IE and transmitted. In addition, if the base station determines that the information received from the terminal is not appropriate, the terminal performs network entry (or re-entry), and then uplink feedback using the Feedback allocation A-MAP IE or Feedback polling A-MAP IE to the terminal Assign a channel.

When the terminal performs network entry (re-entry) (301), if the terminal is a fixed terminal (S 302, Yes), MIMO feedback information (for example, Wideband CQI, Wideband STC, Wideband PMI (Perfered) Matrix Index) and the like) are included in the ranging request (AAI-RNG-REQ) message and transmitted (S303). A ranging response (AAI-RNG-RSP) message is received from the base station and the remaining network entry (re-entry) process is performed (S 305). If it is not a fixed terminal (S 302, No), it is possible to perform the existing normal (entry) network entry (re-entry) process (S 304).

4 is a diagram illustrating a process of performing feedback when a base station performs network entry (or reentry) of a terminal according to the present invention.

When the base station receives a ranging request (AAI-RNG-REQ) message from the terminal (S 401), if the ranging request (AAI-RNG-REQ) message includes MIMO feedback (feedback) information (S 402, Yes) ), The ranging response (AAI-RNG-RSP) message is transmitted using the included MIMO feedback information (S 403), and the remaining network entry procedure is performed (S 405). If no MIMO feedback information is included in the ranging request (AAI-RNG-REQ) message (S402, No), the ranging response (AAI-RNG-RSP) message is transmitted after the conventional method. In step S404, the remaining network entry (re-entry) procedure is performed.

5 is another embodiment illustrating a process of performing feedback when an M2M device performs network entry (or reentry) according to the present invention.

In the network entry (or reentry) procedure (S 501), regardless of whether the terminal is a fixed terminal or a mobile terminal, the terminal includes MIMO feedback information in a ranging request (AAI-RNG-REQ) message and transmits it (S 502). Wait for a ranging response (AAI-RNG-RSP) message from the base station. Thereafter, the remaining network entry (reentry) process is performed (S503).

6 is another embodiment illustrating a process of performing feedback when an M2M device performs network entry (or reentry) according to the present invention.

In the network entry (or reentry) procedure (S601), MIMO feedback information included in the ranging request (AAI-RNG-REQ) message regardless of whether the terminal is a fixed terminal or a mobile terminal is transmitted to the base station by the terminal. This corresponds to feedback information. The feedback information used last is included in the ranging request (AAI-RNG-REQ) message and transmitted to the base station (S 602), and waits for receiving the ranging response (AAI-RNG-RSP) message from the base station. Thereafter, the remaining network entry (re-entry) process is performed (S 603).

7 is another embodiment illustrating a process of performing feedback when an M2M device performs network entry (or reentry) according to the present invention.

The UE measures the downlink channel at network entry (re-entry) (S 701) (S 702), and transmits the measured MIMO feedback information in a ranging request (AAI-RNG-REQ) message. (S 703). Wait for a ranging response (AAI-RNG-RSP) message from the base station. Thereafter, the remaining network entry (reentry) process is performed (S704).

8 is another embodiment illustrating a process of performing feedback when a fixed M2M device performs network entry (or reentry) according to the present invention.

The terminal starts a network entry (reentry) procedure (S801). Only when the terminal is a fixed terminal (S 802, Yes), the last used MIMO feedback information is included in the ranging request (AAI-RNG-REQ) message and transmitted (S 803). Wait for AAI-RNG-RSP) message. Thereafter, the remaining network entry (re-entry) process is performed (S805). If the terminal is not a fixed terminal (S802, No), the existing normal network entry (re-entry) procedure is performed (S804).

9 is another embodiment illustrating a process of performing feedback when a fixed M2M device performs network entry (or reentry) according to the present invention.

The terminal starts a network entry (re-entry) procedure (S 901). Only when the terminal is a fixed terminal (S902, Yes) after measuring the downlink channel (S 903), the measured MIMO feedback (feedback) information is included in the ranging request (AAI-RNG-REQ) message and transmitted ( S 904, waits for receiving a ranging response (AAI-RNG-RSP) message from the base station. Thereafter, the remaining network entry (reentry) process is performed (S905). If the terminal is not a fixed terminal (S902, No), the existing normal network entry (re-entry) procedure is performed (S906).

10 is another embodiment illustrating a process of performing feedback when a fixed M2M device performs network entry (or reentry) according to the present invention.

The terminal starts a network entry (re-entry) procedure (S 1001). Only when the terminal is a fixed terminal (S 1002, Yes), the MIMO feedback information used last is included in the ranging request (AAI-RNG-REQ) message and transmitted (S 1003), and the ranging response ( Wait for AAI-RNG-RSP) message. Thereafter, the remaining network entry (re-entry) process is performed (S 1006). If the UE is not a fixed UE, after measuring the downlink channel (S 1004), the measured MIMO feedback information is included in the range request (AAI-RNG-REQ) message and transmitted (S 1005) from the base station. Wait for a ranging response (AAI-RNG-RSP) message. Thereafter, the remaining network entry (re-entry) process is performed (S 1006).

11 illustrates operations of a terminal and a base station according to the present invention.

The terminal transmits a ranging code (Ranging code) for network entry (or re-entry) to the base station (S 1101). The base station transmits the ranging check success message to the terminal (S 1102). When the UE transmits the MIMO information (CQI, PMI, STC, etc.) included in the ranging request (AAI-RNG-REQ) message (S 1103), the base station transmits the ranging response (AAI-RNG-RSP) message From the CDMA Allocation A-MAP IE (CDMA Allocation A-MAP IE) to include the MIMO encoding format (MIMO Encoding Format; MEF) or the number of transmit antennas (Mt) to apply the appropriate MIMO mode to the terminal (S 1104) downlink Data may be transmitted (S 1105). The MIMO Encoding Format (MEF) may be Space Frequency Block Coding (SFBC) or Vertical encoding.

Table 1 shows an example of a ranging request (AAI-RNG-REQ) message transmitted by the terminal including MIMO feedback information.

Here, the MMO (MIMO Feedback Mode) bitmap refers to a bitmap indicating a MIMO Feedback Mode for the UE to transmit feedback.

The wideband channel quality indicator (CQI) is one CQI average value over the entire band, and the subband CQI is one CQI average value over the subband. Wideband Space Time Coding (STC) is Space Time Coding (STC) over the entire band. Wideband Preferred Matrix Index (PMI) is the preferred matrix index (PMI) over the entire band. According to the MFM bitmap, it can be transmitted including a wideband CQI, a wideband STC, a wideband PMI, and the like.

Field Size (bits) Value Condition Ranging purpose indication 4 CMAC Indicator One else if (Ranging Purpose Indication
== 0b0010) { if (S-SFH Network Configuration
bit == 0b1 or AMSID privacy
is disabled) { AMS MAC address 48 } else { Deregistration Identifier (DID) 18 } MFM bitmap 2 Maximum of  3 distinct concurrent  MFM are allowed with MFM _ bitmap .
LSB  #0: MFM  0
LSB  #One: MFM  4
If  ( LSB #0 in MFM _ bitmap  == 1) { Wideband CQI Wideband STC rate 3 '. STC rate  - One.' mapped to  3-bit unsigned integer
(i.e., STC rate = 1 as  0 b000  ~ STC  rate = 8 as  0 b111 ) } If  ( LSB #One in MFM _ bitmap  == 1) { Wideband CQI 4 Wideband STC 3 '. STC rate  - One.' mapped to  3-bit unsigned integer
(i.e., STC rate = 1 as  0 b000  ~ STC  rate = 8 as  0 b111 ) Wideband PMI 6 wideband preferred matrix  index ( PMI ), you of which  is number of PMI bits  ('.NB.' used ,
mapped to NB LSB bits of this field , while the remaining MSB bit (s) set  to zero (0) } Paging Controller ID else if (Ranging Purpose Indication
== 0b0011
| 0b0110 | 0b0111 | 0b1011) {
... ... ...

A base station receiving MIMO feedback information through a ranging request (RNG-REQ) message transmits a ranging response (AAI-RNG-RSP) message through a CDMA Allocation A-MAP IE (CDMA Allocation A-MAP IE). In this case, MIMO mode information suitable for the UE may be included in the CDMA Allocation A-MAP IE and transmitted. That is, when transmitting a ranging response (AAI-RNG-RSP) message through the CDMA Allocation A-MAP IE (CDMA Allocation A-MAP IE), the MIMO mode suitable for the terminal is applied.

Table 2 shows an example of a CDMA Allocation A-MAP IE modified for the present invention. 8 bits of the CDMA_Allocation_A-MAP IE, which have not been previously allocated, may include a MIMO encoding format (MEF) or the number of transmit antennas (Mt) to transmit downlink data by applying an appropriate MIMO mode to the terminal.

Syntax Size (bits) Notes CDMA_Allocation_A-MAP IE { A-MAP IE type 4 CDMA Allocation A-MAP IE CDMA allocation indication One 0b0: Bandwidth allocation in response to a received contention-based bandwidth request.
0b1: Bandwidth allocation in response to a received contention-based ranging request If  ( CDMA allocation indication  ==
0 b0 ) { } Else if  ( CDMA allocation  indication ==
0 b1 ) { Uplink / Downlink Indicator One Indicates whether the following fields are for resource assignment in the uplink or in the downlink.
0b0: Uplink
0b1: Downlink Resource Index 11 ISizeOffset 5 HFA 3 If  ( Uplink Of Downlink  Indicator == 0b0) { } Else  { ACID 4 AI_SN One SPID 2 MEF One MIMO encoder format
0 b00 : SFBC
0 b01 : Vertical encoding
if  ( MEF  == 0 b01 ) { Mt 3 Reserved 4 } else  { Reserved 7 } }

Table 3 below shows an example of a ranging request (AAI-RNG-REQ) message.

According to the MIMO feedback mode, the UE may post various MIMO feedback information.

Field Size (bits) Value Condition Ranging purpose indication 4 CMAC Indicator One else if (Ranging Purpose Indication
== 0b0010) { if (S-SFH Network Configuration
bit == 0b1 or AMSID privacy
is disabled) { AMS MAC address 48 } else { Deregistration Identifier (DID) 18 } Wideband CQI 4 Wideband STC 3 '. STC rate  - One.' mapped to  3-bit unsigned integer
(i.e., STC rate = 1 as  0 b000  ~ STC  rate = 8 as  0 b111 ) Wideband PMI 6 Wideband preferred matrix index  (PMI), you of which  is number of PMI bits  ('. NB . ' used ,
mapped to NB LSB bits of this field , while the remaining MSB bit (s) set  to zero (0) Paging Controller ID else if (Ranging Purpose Indication
== 0b0011
| 0b0110 | 0b0111 | 0b1011) { ... ... ...

Table 4 below shows another example of a ranging request (AAI-RNG-REQ) message.

In Table 4, an MFM bitmap is used to selectively transmit information related to wideband, and only the feedback information corresponding to the bit set to 1 is transmitted.

Field Size (bits) Value Condition Ranging purpose indication 4 CMAC Indicator One else if (Ranging Purpose Indication
== 0b0010) { if (S-SFH Network Configuration
bit == 0b1 or AMSID privacy
is disabled) { AMS MAC address 48 } else { Deregistration Identifier (DID) 18 } MFM bitmap 3 Maximum of  3 distinct concurrent  MFM are allowed with MFM _ bitmap .
If  a currently allocated MFM is  indicated in the MFM _ bitmap , it  indicates a deallocation and  reallocation of this MFM . ACK  Allocation Flag shall be set to  0 b1 in  this case .
LSB  #0: MFM  0
LSB  #One: MFM  4
LSB  #2: MFM  7 If  ( LSB #0 in MFM _ bitmap  == 1) { MaxMt 1-2 Measurement Method Indication One 0 b0 : Use the midamble for CQI measurements
0 b1 : Use pilots in OL region with MaxMt streams for CQI measurements Wideband CQI Wideband STC rate 3 . ' STC rate  - One.' mapped to  3-bit unsigned integer
(i.e., STC rate = 1 as  0 b000  ~ STC  rate = 8 as  0 b111 ) } If  ( LSB #One in MFM _ bitmap  == 1) { MaxMt 1-2 Wideband CQI 4 Wideband STC 3 '. STC rate  - One.' mapped to  3-bit unsigned integer
(i.e., STC rate = 1 as  0 b000  ~ STC  rate = 8 as  0 b111 ) Wideband PMI 6 Wideband preferred matrix index  (PMI), you of which  is number of PMI bits  (' NB . ' used ,
mapped to NB LSB bits of this field , while the remaining MSB bit (s) set  to zero (0) } If  ( LSB #2 in MFM _ bitmap  == 1) { MaxMt 1-2 Wideband CQI 4 Wideband PMI 6 Wideband preferred matrix index  (PMI), you of which  is number of PMI bits  (' NB . ' used ,
mapped to NB LSB bits of this field , while the remaining MSB bit (s) set  to zero (0) } Paging Controller ID else if (Ranging Purpose Indication
== 0b0011
| 0b0110 | 0b0111 | 0b1011) { ... ... ...

Table 5 shows another embodiment of a ranging request (AAI-RNG-REQ) message. The UE sends only wideband CQI information, and the MIMO encoder format that can be used by the base station using this information will be SFBC (Space Frequency Block Coding).

Field Size (bits) Value Condition Ranging purpose indication 4 CMAC Indicator One else if (Ranging Purpose Indication
== 0b0010) { if (S-SFH Network Configuration
bit == 0b1 or AMSID privacy
is disabled) { AMS MAC address 48 } else { Deregistration Identifier (DID) 18 } Wideband CQI 4 Paging Controller ID else if (Ranging Purpose Indication
== 0b0011
| 0b0110 | 0b0111 | 0b1011) { ... ... ...

In the case of UEs without mobility, since channel change does not occur frequently, the channel quality feedback is periodically allocated by the base station by the transmission of feedback allocation A-MAP IE or feedback polling A-MAP IE. Instead of transmitting quality feedback or MIMO feedback, the base station may be configured to transmit the corresponding feedback information by an event of the terminal only when the terminal needs to change the corresponding information.

To this end, the base station sets a feedback mode of the terminal (via SBC-RSP or ranging response (REG-RSP) message) during capability negotiation when the terminal performs network entry. To inform the terminal. When the feedback mode of the corresponding terminal is an event triggered method, the terminal transmits channel quality feedback or MIMO feedback to the base station when an event for a predetermined condition occurs. In order to transmit the MIMO feedback header (MFH) or AAI-SBS-MIMO-FBK message.

Table 6 shows an example of an AAI-SBC-RSP message field.

The MFM indicator may be included in the AAI-SBC-RSP message and transmitted. A value representing the MIMO feedback mode. When the MFM indicator is 0, the MIMO feedback is performed by polling of the base station, and when the MFM indicator is 1, the event is performed. Perform the message in a triggered manner.

Field Size (bits) Value Condition MFM indicator One MIMO feedback mode
0: MIMO feedback by polling of the BS
1: Event triggered method

Table 7 shows an example of a ranging response (AAI-REG-RSP) message field.

The MFM indicator may be included in a ranging response (AAI-REG-RSP) message and transmitted.

Field Size (bits) Value Condition MFM indicator One MIMO feedback mode
0: MIMO feedback by polling of the BS
1: Event triggered method

The above-described embodiments are transmitted to a base station by including MIMO feedback information in a ranging request (AAI-RNG-REQ) message and a CDMA Allocation A-MAP IE (CDMA Allocation A-MAP IE) in an IEEE 802.16m system. This is the way to reduce unnecessary feedback overhead.

Table 8 shows an example of a resource allocation map IE in an existing system (eg, 802.16e or 802.16m). In order for the base station to allocate downlink or uplink resources to the mobile station, a map message and a MAP IE (eg, DL-MAP, UL-MAP, Sub-DL-UL-MAP IE, or compression) are performed in a DL control channel. Various map messages such as MAP (Compressed MAP) and various assignment A-MAP IEs such as UL basic assignment A-MAP IE and UL Basic assignment A-MAP IE in MAP IE, 802.16m) are used.

Table 8 shows an example of a map IE used to carry MIMO information when allocating resources to a terminal having a MIMO mode in 802.16e. Table 8 corresponds to a dedicated MIMO DL Control IE (Dedicated MIMO DL Control IE) format of the existing IEEE 16-2009 system.

Hereinafter, an embodiment of the present invention will be described by exemplifying a case where M2M communication is applied to an IEEE 802.16e system. In the IEEE 802.16e system, since MIMO information is transmitted through one MAP message, joint coding is used. On the other hand, in the IEEE 802.16m system, there is a difference in that separate coding schemes are used by separately coding each MAP message.

In the IEEE 802.16e system proposed below, FIG. 12 illustrates operations of a terminal and a base station according to the present invention. The terminal transmits a ranging code for performing network re-entry to the base station (S 1201). If the UE transmits the MIMO information (CQI, PMI, STC, etc.) in the ranging request (AAI-RNG-REQ), the base station transmits a CDMA allocation A- The downlink data may be transmitted by applying an appropriate MIMO mode to the UE by including the MIMO encoding format or the number of transmit antennas in the MDMA IE (CDMA Allocation A-MAP IE) (S 1203-S 1206). ).

According to the present invention, when a fixed terminal (or M2M device) transitions from idle mode to connected mode, the base station quickly applies a channel condition to use downlink traffic using an appropriate MIMO mode. We propose a method that can be transmitted.

Conventionally, after a terminal enters a network, the base station allocates an initial fast feedback control channel to the terminal using a feedback allocation A-MAP IE or a feedback polling A-MAP IE. MIMO-related fast feedback information is transmitted to the base station through this allocated channel. The base station sets the MIMO mode of the terminal when allocating resources using the MIMO information received from the terminal. This method has a problem in that the base station cannot quickly set the MIMO mode of the terminal until the base station allocates a feedback channel to the terminal and receives feedback information from the terminal.

In the present invention, when the UE transmits a ranging request (RNG-REQ) message in order to apply the MIMO mode faster in network reentry, the UE transmits the MIMO mode and channel information to the ranging request (RNG-REQ) message. Include and send to the base station.

When the terminal performs network reentry, if the terminal has a non-mobility attribute, the terminal may include MIMO information (CAR) in a ranging request (RNG-REQ) message. ), Matrix indicator, etc.) can be sent. In this case, the CQI indicates a DL effective CINR (Carrier to Interface Ratio) value, and the matrix indicator indicates matrix information (indicates whether it is Matrix A or Matrix B) supported by the UE (S 1203). ). When the base station sends a ranging response (RNG-RSP) message for the ranging request (RNG-REQ) message (S 1206), the base station may use the corresponding MIMO information for all DL bursts (S 1205). ).

Table 9 shows an example of the MIMO feedback information TLV included in the ranging request (RNG-REQ) message.

In Table 9, when the base station receives MIMO feedback information for the terminal through a ranging request (RNG-REQ) message during a ranging (RNG) process of the terminal, downlink bursts (eg. For example, a downlink burst profile (ie, RNG-RSP, etc.), that is, a matrix indicator (Matrix indicator) that is an MCS and a downlink MIMO mode (DL MIMO mode) may be determined.

NAME Type Length Value PHY Scope MIMO feedback information 41 One Bit  #0: Matrix indicator . This field suggests the  preferred STC Of MIMO matrix for the MS :
0 b0 : Matrix  A
0 b1 : Matrix  B
Bit  # 1 ~ Bit #4: DL effective CINR as defined in Table  520
Bit  # 5- Bit # 7: reserved All

Table 10 shows another example of MIMO feedback information TLV encoding included in a ranging request (RNG-REQ) message.

MIMO feedback information is information included when the terminal transmits a ranging request (RNG-REQ) message.

NAME Type Length Value MIMO feedback information X 4 Terminal RNG - REQ When sending Inclusive MIMO  Details of the feedback information are shown in Table 11 below.

Table 11 shows an example of MIMO channel feedback information included in a ranging request (RNG-REQ) message.

NAME Size  ( bits ) Value PREFERRED - DIUC 4 Index of the preferred DIUC suggested by the MS . PBWI 4 Preferred bandwidth index . This field provides the you of the preferred
bandwidth , which can be used for DIUC transmission .
PBWI indicates the ratio of the preferred bandwidth over used channel
bandwidth :
0 b0000 : One
0 b0001 : 3/4
0 b0010 : 2/3
0 b0011 : 1/2
0 b0100 : 1/3
0 b0101 : 1/4
0 b0110 : 1/5
0 b0111 : 1/6
0 b1000 : 1/8
0 b1001 : 1/10
0 b1010 : 1/12
0 b1011 : 1/16
0 b1100 : 1/24
0 b1101 1/32
0 b1110 : 1/48
0 b1111 : 1/64
where
Ratio  = Bwpreferred Of Bwused ,
Bwpreferred : Preferred bandwidth for DIUC transmission ,
Bwused : Actual used channel bandwidth  ( excluding guard bands ). SLPB 7 Starting location of preferred bandwidth : 0-127.
This field points to the starting preferred bandwidth location . This field ,
combined with the PBWI field , tells the BS the exact you and location  of the
preferred bandwidth in the channel .
The effective bandwidth  ( used bandwidth ) is divided into  128 intervals
numbered  0 to  127 counting from the lower to the higher band . SLPB indicates
the starting location of preferred bandwidth for the DIUC burst profile . BPRI 2 Burst profile ranking indicator . This field can be used to rank up to four preferred
burst profiles within the DL channel .
BPRI  ( without Basic CID ) indicates the ranking for DL channel  condition of
the preferred bandwidth as reported in the current header where  0 is the most
preferred bandwidth :
0 b00 : One st preferred burst profile
0 b10 : 2 nd preferred burst profile
0 b01 3 rd preferred burst profile
0 b11 : 4 th preferred burst profile
BPRI  ( including Basic CID ):
0 b0 : One st preferred burst profile
0 b1 : 2 nd preferred burst profile
CTI 3 Coherent time index . This field provides coherent time information .
CTI indicates the estimated duration of the valid MIMO channel conditions :
0 b000 : Infinite
0 b001 : One frame
0 b010 : 2 frames
0 b011 3 frames
0 b100 : 4 frames
0 b101 : 8 frames
0 b110 14 frames
0 b111 24 frames
AI 4 Antenna index . This field is for antenna indication . It can support up to four
antennas .
This feedback header can report  a composite channel condition ; each bit
represents for each antenna : "One" is applicable , "0" is  note applicable .
AI :
Bit  0 ( MSB ) - Antenna  0
Bit  One - Antenna  One
Bit  2 - Antenna  2
Bit  3 ( LSB )- Antenna  3
MI 2 Matrix indicator . This field suggests the preferred STC Of MIMO matrix for
the MS :
0 b00 : No STC
0 b01 : Matrix  A
0 b10 : Matrix  B
0 b11 : Matrix  C
CT One CQI type . This field indicates the type of CQI feedback in the CQI field :
0: DL average CQI feedback
One: CQI feedback for the preferred bandwidth indicated in the current
header CQI 5 CQI feedback .

In the IEEE 802.16e system proposed below, when a base station allocates resources to fixed terminals, the base station has recently sent MCS information (DIUC / UIUC) and MIMO information (Matrix) used by the terminal to MAP. When the MCS information and the MIMO information are the same, a method of transmitting an indication to use the latest information in the map MAP is transmitted. In the fixed state, the channel change of the devices hardly occurs, and thus, the MCS (DIUC / UIUC) or MIMO information used by the UE will not change the matrix information for a long time. Therefore, whenever the base station allocates resources, it may be unnecessary map overhead to insert matrix information or MCS information each time. Accordingly, an object of the present invention is to provide a method for efficiently allocating resources to a terminal or an M2M device without mobility. Unlike the IEEE 802.16m system, CDMA Allocation IE is used only for uplink (UL), and thus does not transmit MIMO feedback information. There is a difference in that the UE transmits MIMO feedback information only to the ranging request (RNG-REQ) message and transmits it to the base station.

13 is another embodiment illustrating a process of performing feedback when a fixed M2M device performs network entry (or reentry) according to the present invention.

When the base station allocates resources to the fixed terminals, the base station is MCS information (DUC: Downlink Interval Usage Code / UIUC: Uplink Interval Usage Code) used by the terminal in MAP and MCS information recently sent by the MIMO information (Matrix) If and the MIMO information is the same, the base station transmits a map (MAP) including an indication to use the latest information (S1301). In this case, explicit MCS information and MIMO information are not included. However, when the MCS information and the MIMO information recently transmitted by the terminal to the MAP are different from the MCS information and the MIMO information, the base station transmits a map (MAP) including explicit MCS information and MIMO information (S1302). In this case, matrix information included in the MAP message may be used.

Tables 12-17 below show the Last MCS indication and the Last MIMO indicator in DL / UL HARQ MAP IEs defined previously for resource allocation of fixed M2M devices. Indicates modified maps (MAPs), including indications.

Table 12 shows a DL HARQ Chase Subburst IE format.

In Table 12, the DIUC such as the previous burst has the most recent DIUC information except for the DIUC information in which the subburst DIUC indicator is 1 and the last DIUC indicator is set to 1 in the previous allocation. Point to. If the currently used DIUC information is the same as the most recently used DIUC information, the last DIUC indicator is set to zero. If the Last DIUC indicator is set to 1, the DIUC information is different and DIUC information is allocated for this subburst.

Syntax Size  ( bits ) Notes DL_HARQ_Chase_Subburst_IE () { N subburst 4 subburst DIUC Indicator One If subburst DIUC Indicator is 1, it indicates that
DIUC is explicitly assigned for this subburst.
Otherwise, this subburst shall use the same DIUC
as the previous subburst.
The DIUC as the previous burst is subburst DIUC Indicator is 1 in the previous assignment, Last DIUC The indicator indicates the most recent DIUC information except the DIUC information set to 1 .
If j is 0 then this indicator shall be 1
Group Indicator One If (subburst DIUC Indicator == 1) { Last DIUC indicator One Currently used DIUC The information was last used by the terminal DIUC If equal to information, it is set to zero. If set to 1, DIUC The information is different, DIUC Information is allocated for this subburst. If  ( Last DIUC indicator  == 1) { DIUC 4 Repetition Coding Indication 2 0b00: No repetition coding
0b01: Repetition coding of 2 used
0b10: Repetition coding of 4 used
0b11: Repetition coding of 6 used Reserved 2 Shall be set to zero } } padding

Table 13 shows a DL HARQ IR CC Subburst IE format.

As in Table 12, the same DIUC as the previous burst has the most recent except for the DIUC information with the subburst DIUC indicator set to 1 and the last DIUC indicator set to 1 in the previous assignment. Points to DIUC information. If the currently used DIUC information is the same as the most recently used DIUC information, the last DIUC indicator is set to zero. If set to 1, the DIUC information is different and DIUC information is allocated for this subburst.

Syntax Size  ( bits ) Notes DL_HARQ_IR_CC_Subburst_IE () { N subburst 4 subburst DIUC Indicator One If subburst DIUC Indicator is 1, it indicates that
DIUC is explicitly assigned for this subburst.
Otherwise, this subburst shall use the same DIUC
as the previous subburst.
The DIUC as the previous burst is subburst DIUC Indicator is 1 in the previous assignment, Last DIUC The indicator indicates the most recent DIUC information except the DIUC information set to 1 .
If j is 0 then this indicator shall be 1
Group Indicator One If (subburst DIUC Indicator == 1) { Last DIUC indicator One Currently used DIUC The information was last used by the terminal DIUC If equal to information, it is set to zero. If set to 1, DIUC The information is different, DIUC Information is allocated for this subburst. If  ( Last DIUC indicator  == 1) { DIUC 4 Repetition Coding Indication 2 0b00: No repetition coding
0b01: Repetition coding of 2 used
0b10: Repetition coding of 4 used
0b11: Repetition coding of 6 used Reserved 2 Shall be set to zero } } padding

Table 14 shows an example of a MIMO DL Chase HARQ Subburst IE format.

Last DIUC indicator is set to 0 if the current DIUC information is the same as the last DIUC information used by the terminal. If the Last DIUC indicator is set to 1, the DIUC information is different and DIUC information is allocated for this sub burst.

Syntax Size (bits) Notes MIMO_DL_Chase_HARQ_subburst_IE () () { N subburst 4 if (MU indicator == 1) { RCID IE () } Last DIUC indicator One Currently used DIUC The information was last used by the terminal DIUC If equal to information, it is set to zero. If set to 1, DIUC The information is different, DIUC Information is allocated for this subburst. If  ( Last DIUC indicator  == 1) { DIUC 4 Repetition Coding Indication 2 0b00: No repetition coding
0b01: Repetition coding of 2 used
0b10: Repetition coding of 4 used
0b11: Repetition coding of 6 used } } padding

Table 15 shows an example of a MIMO DL IR HARQ for CC Subburst IE format.

Last DIUC indicator is set to 0 if the current DIUC information is the same as the last DIUC information used by the terminal. If the Last DIUC indicator is set to 1, the DIUC information is different and DIUC information is allocated for this sub burst.

Syntax Size (bits) Notes MIMO_DL_IR_HARQ_for_CC_subburst_IE () { N subburst 4 if (MU indicator == 1) { RCID IE () } Last DIUC indicator One Currently used DIUC The information was last used by the terminal DIUC If equal to information, it is set to zero. If set to 1, DIUC The information is different, DIUC Information is allocated for this subburst. If  ( Last DIUC indicator  == 1) { DIUC 4 Repetition Coding Indication 2 0b00: No repetition coding
0b01: Repetition coding of 2 used
0b10: Repetition coding of 4 used
0b11: Repetition coding of 6 used } } padding

Table 16 shows an example of a MIMO DL STC HARQ Subburst IE format.

The last DIUC indicator is set to 0 when the current DIUC information is the same as the last DIUC information used by the terminal. If the last DIUC indicator is set to 1, the DIUC information is different and DIUC information is allocated for this sub burst.

Syntax Size (bits) Notes MIMO_DL_STC_HARQ_subburst_IE () { N subburst 4 if (Dedicated MIMO DL Control Indicator == 1)) { Dedicated MIMO DL Control IE () } Last DIUC indicator One Currently used DIUC The information was last used by the terminal DIUC If equal to information, it is set to zero. If set to 1, DIUC The information is different, DIUC Information is allocated for this subburst. If  ( Last DIUC indicator  == 1) { DIUC 4 Repetition Coding Indication 2 0b00: No repetition coding
0b01: Repetition coding of 2 used
0b10: Repetition coding of 4 used
0b11: Repetition coding of 6 used } } padding

Table 17 shows an example of the dedicated MIMO DL Control IE format.

If the currently used MIMO control information (MIMO Control Info & Closed MIMO Control Info) is the same as the most recently used MIMO information by the corresponding UE and CQI Control Info is not assigned, the last MIMO Info indicator (Last MIMO Info) indicator) is set to zero. When the last MIMO information indicator is set to 1, CQI control information, MIMO control information, and closed MIMO control information are included and transmitted.

Syntax Size (bits) Notes Dedicated_MIMO_DL_Control_IE () { Length 5 Last MIMO Info indicator One Currently used MIMO Information( MIMO Control Info  & Closed  MIMO Control Info ) Used most recently MIMO Like information CQI Control Info If is not assigned, it is set to zero. If set to 1, CQI Control Info , MIMO Control Info , Closed MIMO Control Info Included is sent. If  ( Last MIMO Info indicator  == 1) { Control header 3 Bit 0: MIMO Control Info
Bit 1: CQI Control Info
Bit 2: Closed MIMO Control Info N_layer 2 Number of coding / modulation layers
0b00 = 1 layer
0b01 = 2 layers
0b10 = 3 layers
0b11 = 4 layers if (MIMO Control Info == 1) {  Matrix 2 if (Dedicated Pilots == 1) { Num_streams } Codebook Precoding Index Indicates the index of precoding matrix W in
the codebook (see 8.4.8.3.6) } } } padding Padding to Nibble; shall be set to 0 }

A new map can be defined for fixed M2M devices that contain the above information. The fields of the newly defined map will be the same as the MAP IEs modified above. Tables 18 and 19 below show new maps.

Table 18 shows an example of the M2M HARQ DL MAP IE format.

Syntax Size (bits) Notes M2M _ HARQ _ DL _ MAP _ IE () { Extended -2 DIUC 4 Length 8 RCID_Type ACK region index Reserved While (data remains) { Boosting Region_ID use indicator Mode 4 Indicates the mode of this HARQ region :
0 b0000 : M2M DL Chase HARQ
0 b0001 : M2M DL Incremental redundancy HARQ for CTC
0 b0010 : M2M DL Incremental redundancy HARQ for Convolutional
Code
0 b0011 : M2M DL MIMO Chase HARQ
0 b0100 : M2M DL MIMO IR HARQ
0 b0101 : M2M DL MIMO IR HARQ for Convolutional Code
0 b0110 : M2M DL MIMO STC HARQ
0 b0111 -0 b1111 : Reserved Subburst IE Length 8 If (Mode == 0b0000) { M2M DL _ HARQ _ Chase _ subburst _ IE () One } else if (Mode == 0b0001) { One } } padding

Table 19 shows an example of an M2M DL HARQ Chase Subburst IE format.

Here, the same DIUC as the previous burst indicates the most recent DIUC information except for the DIUC information in which the subburst DIUC indicator is 1 and the last DIUC indicator is set to 1 in the previous allocation. If the currently used DIUC information is the same as the most recently used DIUC information, the last DIUC indicator (Last DIUC indicator) is set to zero. If the last DIUC indicator is set to 1, the DIUC information is different and DIUC information is allocated for this subburst.

Syntax Size  ( bits ) Notes M2M _ DL _ HARQ _ Chase _ Subburst _ IE  () { N subburst 4 subburst DIUC Indicator One If subburst DIUC Indicator is 1, it indicates that
DIUC is explicitly assigned for this subburst.
Otherwise, this subburst shall use the same DIUC
as the previous subburst.
Where a DIUC equal to the previous burst is a subburst DIUC from the previous allocation Indicator is a 1, Last DIUC The indicator indicates the most recent DIUC information except the DIUC information set to 1 .
If j is 0 then this indicator shall be 1
Group Indicator One If (subburst DIUC Indicator == 1) { Last DIUC indicator One Currently used DIUC The information was last used by the terminal DIUC If equal to information, it is set to zero. If set to 1, DIUC The information is different, DIUC Information is allocated for this subburst. If  ( Last DIUC indicator  == 1) { DIUC 4 Repetition Coding Indication 2 0b00: No repetition coding
0b01: Repetition coding of 2 used
0b10: Repetition coding of 4 used
0b11: Repetition coding of 6 used Reserved 2 Shall be set to zero } } padding

Since the remaining new HARQ subburst IEs will have a similar form to the existing subburst IEs similar to DL_HARQ_Chase_Subburst_IE, detailed format is omitted. The omitted part is omitted in the present invention because the information contained in the existing map IE can be reused.

In addition, in uplink resource allocation, MCS (UIUC) and MIMO information may be applied in the same way as for downlink.

As described above, the present invention can be applied to the M2M device 100 and the base station 150 of FIG. 1. Referring to FIG. 1, the processor 120 of the M2M device 100 configures a ranging request message to include MIMO feedback information according to an embodiment of the present invention, and transmits the ranging request message to the base station 150. The transmitter 111 may be controlled to transmit to Alternatively, the processor 120 may control the receiver 112 to receive a ranging response message according to the ranging request message from the base station 150, and to the base station 150 based on the ranging response message. A network entry procedure can be performed. The processor 170 of the base station 150 may control the receiver 162 to receive a ranging request message including MIMO feedback information from the M2M device 100. Alternatively, the processor 170 may control the transmitter 161 to transmit the ranging response message to the M2M device 100 using the ranging request message.

The embodiments described above are the components and features of the present invention are combined in a predetermined form. Each component or feature shall be considered optional unless otherwise expressly stated. Each component or feature may be implemented in a form that is not combined with other components or features. It is also possible to construct embodiments of the present invention by combining some of the elements and / or features. The order of the operations described in the embodiments of the present invention may be changed. Some configurations or features of certain embodiments may be included in other embodiments, or may be replaced with corresponding configurations or features of other embodiments. It is clear that the claims that are not expressly cited in the claims may be combined to form an embodiment or be included in a new claim by an amendment after the application.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. Accordingly, the above detailed description should not be interpreted as limiting in all aspects and should be considered as illustrative. The scope of the invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the invention are included in the scope of the invention.

Claims (10)

In the terminal transmits multiple input multiple output (MIMO) feedback information in a wireless communication system,
Transmitting a ranging request message to a base station; And
Receiving a ranging response message according to the ranging request message from the base station,
The terminal is a fixed machine to machine (M2M) device, the ranging request message includes MIMO feedback information,
How to send MIMO feedback information. The method of claim 1,
The MIMO feedback information is new MIMO feedback information obtained by newly measuring a downlink channel from the base station.
How to send MIMO feedback information. The method of claim 1,
The MIMO feedback information is MIMO feedback information that the terminal most recently transmitted to the base station.
How to send MIMO feedback information. 4. The method according to claim 2 or 3,
The MIMO feedback information is information including one or more of an MFM bitmap, Channel Quality Indicator (CQI), Space Time Coding (STC), and Preferred Matrix Index (PMI).
How to send MIMO feedback information. In the base station receiving the multiple input multiple output (MIMO) feedback information from the terminal in a wireless communication system,
Receiving a ranging request message from the terminal; And
And transmitting a ranging response message to the terminal using the ranging request message.
The terminal is a fixed M2M device, the ranging request message includes MIMO feedback information,
How to receive MIMO feedback information. In the terminal transmits multiple input multiple output (MIMO) feedback information in a wireless communication system,
receiving set;
transmitter; And
And a processor configured to control the receiver and the transmitter,
The processor controls the transmitter to transmit a ranging request message to a base station, controls the receiver to receive a ranging response message according to the ranging request message, and the terminal is a fixed M2M device. The ranging request message includes MIMO feedback information.
Terminal. The method according to claim 6,
The MIMO feedback information is new MIMO feedback information obtained by newly measuring a downlink channel from the base station.
Terminal. The method according to claim 6,
The MIMO feedback information is MIMO feedback information that the terminal most recently transmitted to the base station.
Terminal. 9. The method according to claim 7 or 8,
The MIMO feedback information is information including one or more of an MFM bitmap, Channel Quality Indicator (CQI), Space Time Coding (STC), and Preferred Matrix Index (PMI).
Terminal. In the base station receiving the multiple input multiple output (MIMO) feedback information from the terminal in a wireless communication system,
receiving set;
transmitter; And
And a processor configured to control the receiver and the transmitter,
The processor controls the receiver to receive a ranging request message from the terminal, controls the transmitter to transmit a ranging response message to the terminal using the ranging request message, and the terminal is fixed. M2M device, the ranging request message includes MIMO feedback information,
Base station.

Images