WO2012087009A2 - Ranging method and ranging apparatus in a wireless communication system - Google Patents

Ranging method and ranging apparatus in a wireless communication system Download PDF

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Publication number
WO2012087009A2
WO2012087009A2 PCT/KR2011/009903 KR2011009903W WO2012087009A2 WO 2012087009 A2 WO2012087009 A2 WO 2012087009A2 KR 2011009903 W KR2011009903 W KR 2011009903W WO 2012087009 A2 WO2012087009 A2 WO 2012087009A2
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ranging
base station
m2m
m2m device
ranging opportunity
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PCT/KR2011/009903
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French (fr)
Korean (ko)
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WO2012087009A3 (en
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이진
정인욱
최진수
박기원
육영수
김정기
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엘지전자 주식회사
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Publication of WO2012087009A3 publication Critical patent/WO2012087009A3/en

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W74/00Wireless channel access, e.g. scheduled or random access
    • H04W74/08Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
    • H04W74/0833Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W4/00Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/70Services for machine-to-machine communication [M2M] or machine type communication [MTC]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W74/00Wireless channel access, e.g. scheduled or random access
    • H04W74/002Transmission of channel access control information
    • H04W74/006Transmission of channel access control information in the downlink, i.e. towards the terminal

Abstract

Provided are a ranging method and a ranging apparatus in a wireless communication system. A machine-to-machine (M2M) device receives a ranging opportunity configuration parameter including an M2M device identifier (ID) of the M2M device from a base station, receives a paging message from the base station, and attempts ranging to the base station in the ranging opportunity acquired through a modulo operation for the M2M device ID.

Description

Ranging method and apparatus in a wireless communication system

The present invention relates to wireless communications, and more particularly to a ranging method and apparatus in a wireless communication system.

The Institute of Electrical and Electronics Engineers (IEEE) 802.16e standard is the sixth standard for the International Mobile Telecommunications (IMT-2000) in the ITU-Radiocommunication Sector (ITU-R) under the International Telecommunication Union (ITU) in 2007. It was adopted under the name OFDMA TDD '. ITU-R is preparing the IMT-Advanced system as the next generation 4G mobile communication standard after IMT-2000. The IEEE 802.16 Working Group (WG) decided to implement the IEEE 802.16m project in late 2006 with the aim of creating an amendment specification for the existing IEEE 802.16e as a standard for IMT-Advanced systems. As can be seen from the above objectives, the IEEE 802.16m standard implies two aspects: the past continuity of modification of the IEEE 802.16e standard and the future continuity of the specification for next generation IMT-Advanced systems. Therefore, the IEEE 802.16m standard is required to satisfy all the advanced requirements for the IMT-Advanced system while maintaining compatibility with the Mobile WiMAX system based on the IEEE 802.16e standard.

The IEEE 802.16p specification, which is based on the IEEE 802.16e standard and the IEEE 802.16m standard and optimized for machine-to-machine communication (M2M), is being developed. M2M communication may be defined as an information exchange performed between a subscriber station and a server or between subscriber stations in a core network without any interaction with a person. . The IEEE 802.16p specification is a minimal change in the Orthogonal Frequency Division Multiple Access (OFDMA) physical layer (PHY) within the enhancements of Medium Access Control (MAC) and licensed bands of the IEEE 802.16 specification. Is under discussion. As the IEEE 802.16p specification is discussed, wide area wireless coverage is required within the licensed band, and the scope of application of automated M2M communications for the purpose of observation and control is wide. Can lose.

Many M2M applications have significantly different requirements for network access, typically human-initiated or human-controlled network access. Require. M2M applications include vehicular telematics for vehicles, healthcare monitoring of bio-sensors, remote maintenance and control, smart metering, and consumer devices Automated services, etc. M2M application requirements include very lower power consumption, large numbers of devices, short bursts, etc. transmission, device tampering detection and reporting, improved device authentication, and the like.

Ranging means a series of processes for maintaining the quality of the RF communication between the terminal and the base station. By ranging, an accurate timing offset, a frequency offset, and a power adjustment can be obtained, and transmission of the terminal can be aligned with the base station. The plurality of M2M devices may perform contention-based ranging with each other. A plurality of M2M devices may belong to an M2M group, where M2M devices belonging to the same M2M group share the same M2M service application and / or the same M2M user.

Meanwhile, the M2M device does not frequently generate data to be transmitted, and it is likely that the time for transmitting or receiving data is very short. Accordingly, the M2M device is expected to operate in the idle mode most of the time except for the period of transmitting or receiving data. However, when a paging message is transmitted from the network to the M2M device to transmit data to a large number of M2M devices belonging to the idle mode, the plurality of M2M devices that receive the paging message simultaneously range to receive the data. Can be performed. It is assumed that data reception of the M2M device is possible only in a connected state. In addition, even when data transmission from a plurality of M2M devices belonging to a specific M2M group to an M2M server is expected at the same time, the plurality of M2M devices may simultaneously perform ranging.

Therefore, there is a need for a method for distributing ranging opportunities of each M2M device so that a plurality of M2M devices can perform ranging without collision.

An object of the present invention is to provide a ranging method and apparatus in a wireless communication system.

In one aspect, there is provided a ranging method by a machine-to-machine apparatus in a wireless communication system. The ranging method receives a ranging opportunity configuration parameter including an M2M device identifier (ID) of the M2M device from a base station, receives a paging message from the base station, and receives the M2M device ID. Attempting ranging to the base station at a ranging opportunity obtained through a modulo operation for.

The ranging opportunity configuration parameter includes N allocated by the base station according to a network load, and the ranging opportunity is obtained by calculating (M2M device ID) modulo N in a time domain. It may be any one selected from one of a plurality of ranging opportunities.

N may be any one of the number of M2M devices managed by the base station or the number of M2M devices that are expected to range to the base station.

The ranging opportunity configuration parameter includes a size M of a ranging opportunity window in which the M2M device can attempt ranging, and the ranging opportunity performs operation of (M2M device ID) modulo M in the time domain. It may be obtained through.

M may be expressed as a start value and an end value.

The ranging opportunity configuration parameter may include a ranging opportunity window start parameter indicating a starting point of the ranging opportunity window.

The M2M device ID is any one of a device ID during a idle mode, a station ID (DID), a device ID during a connected mode, or a separate value assigned from the base station. Can be.

The ranging opportunity configuration parameter may be received upon network entry of the M2M device.

The ranging opportunity configuration parameter may be received when the M2M device enters an idle mode.

The ranging opportunity configuration parameter may be included in the paging message.

In another aspect, a machine-to-machine apparatus is provided in a wireless communication system. The M2M device includes a radio frequency (RF) unit for transmitting or receiving a radio signal, and a processor connected to the RF unit, wherein the processor includes a ranging from a base station to an M2M device identifier of the M2M device. Receive a ranging opportunity configuration parameter, receive a paging message from the base station, and perform ranging to the base station in a ranging opportunity obtained through a modulo operation on the M2M device ID. Configured to attempt.

When multiple M2M devices perform ranging, the likelihood of collision may be reduced.

1 illustrates a wireless communication system.

2 and 3 illustrate an example of a system architecture of IEEE 802.16 supporting machine-to-machine communication.

4 shows an example of a frame structure of IEEE 802.16e.

5 shows an example of a frame structure of IEEE 802.16m.

6 shows an example of a ranging process of IEEE 802.16e.

7 shows an example of a ranging process of IEEE 802.16m.

8 shows an example of a ranging opportunity window according to the proposed ranging method.

9 shows an embodiment of a ranging method of the proposed M2M device.

10 shows another example of a ranging opportunity window according to the proposed ranging method.

11 shows an embodiment of a ranging method of the proposed M2M device.

12 is a block diagram of a wireless communication system in which an embodiment of the present invention is implemented.

The following techniques include code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), and the like. It can be used in various wireless communication systems. CDMA may be implemented with a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA may be implemented with wireless technologies such as Global System for Mobile communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE). OFDMA may be implemented in a wireless technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, Evolved UTRA (E-UTRA), or the like. IEEE 802.16m is an evolution of IEEE 802.16e and provides backward compatibility with systems based on IEEE 802.16e. UTRA is part of the Universal Mobile Telecommunications System (UMTS). 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) is part of Evolved UMTS (E-UMTS) using Evolved-UMTS Terrestrial Radio Access (E-UTRA), which employs OFDMA in downlink and SC in uplink -FDMA is adopted. LTE-A (Advanced) is the evolution of 3GPP LTE.

For clarity, the following description focuses on IEEE 802.16m, but the technical spirit of the present invention is not limited thereto.

1 illustrates a wireless communication system.

The wireless communication system 10 includes at least one base station (BS) 11. Each base station 11 provides a communication service for a particular geographic area (generally called a cell) 15a, 15b, 15c. The cell can in turn be divided into a number of regions (called sectors). The UE 12 may be fixed or mobile, and may have a mobile station (MS), a mobile terminal (MS), a mobile terminal (MT), a user terminal (UT), a subscriber station (SS), a wireless device, a PDA ( Other terms may be referred to as a personal digital assistant, a wireless modem, a handheld device, etc. The base station 11 generally refers to a fixed station that communicates with the terminal 12. It may be called other terms such as an evolved-NodeB (eNB), a base transceiver system (BTS), and an access point.

The UE belongs to one cell, and the cell to which the UE belongs is called a serving cell. A base station that provides a communication service for a serving cell is called a serving BS. Since the wireless communication system is a cellular system, there are other cells adjacent to the serving cell. Another cell adjacent to the serving cell is called a neighbor cell. A base station that provides communication service for a neighbor cell is called a neighbor BS. The serving cell and the neighbor cell are relatively determined based on the terminal.

This technique can be used for downlink or uplink. In general, downlink means communication from the base station 11 to the terminal 12, and uplink means communication from the terminal 12 to the base station 11. In downlink, the transmitter may be part of the base station 11 and the receiver may be part of the terminal 12. In uplink, the transmitter may be part of the terminal 12 and the receiver may be part of the base station 11.

2 and 3 illustrate an example of a system architecture of IEEE 802.16 supporting machine-to-machine communication.

2 shows a basic M2M service system structure. The basic M2M service system architecture 20 may include a mobile network operator (MNO) 21, an M2M service consumer 24, at least one IEEE 802.16 M2M device (hereinafter, 802.16 M2M device, 28), at least One non-IEEE 802.16 M2M device 29 is included. The MNO 21 includes an access service network (ASN) and a connectivity service network (CSN). The 802.16 M2M device 28 is an IEEE 802.16 terminal with M2M functionality. The M2M server 23 is an entity that communicates with one or more 802.16 M2M devices 28. The M2M server 23 has an interface to which the M2M service consumer 24 can connect. The M2M service consumer 24 is a user of the M2M service. The M2M server 23 may be inside or outside a connectivity service network (CSN) and may provide specific M2M services to one or more 802.16 M2M devices 28. The ASN may include an IEEE 802.16 base station 22. The M2M application is operated based on the 802.16 M2M device 28 and the M2M server 23.

The basic M2M service system architecture 20 supports two kinds of M2M communication: M2M communication between one or more 802.16 M2M devices and an M2M server or point-to-multipoint communication between 802.16 M2M devices and an IEEE 802.16 base station. do. The basic M2M service system architecture of FIG. 2 allows an 802.16 M2M device to act as an aggregation point for a non-IEEE 802.16 M2M device. Non-IEEE 802.16 M2M devices use a wireless interface different from IEEE 802.16, such as IEEE 802.11, IEEE 802.15 or PLC. At this time, the change of the air interface of the non-IEEE 802.16 M2M device to IEEE 802.16 is not allowed.

3 shows an advanced M2M service system structure. Similarly, in the enhanced M2M service system structure, an 802.16 M2M device may operate as an aggregation point for a non-IEEE 802.16 M2M device and may also operate as an aggregation point for an 802.16 M2M device. In this case, the wireless interface may be changed to IEEE 802.16 in order to perform the aggregation function for the 802.16 M2M device and the non-802.16 M2M device. In addition, an enhanced M2M service system architecture may support peer-to-peer (P2P) connections between 802.16 M2M devices, where the P2P connections may be over IEEE 802.16 or over another wireless interface such as IEEE 802.11, IEEE 802.15, or PLC. Can be connected.

Hereinafter, the frame structure of IEEE 802.16e and IEEE 802.16m will be described.

4 shows an example of a frame structure of IEEE 802.16e.

4 shows a time division duplex (TDD) frame structure in IEEE 802.16e. The TDD frame includes a DL transmission period and a UL transmission period. The downlink transmission period is preceded in time by the uplink transmission period. The DL transmission period includes a preamble, a frame control header (FCH), a DL-MAP, a UL-MAP, and a DL burst region. The UL transmission period includes a ranging subchannel and an UL burst region. A guard time for distinguishing the DL transmission period from the UL transmission period is inserted in the middle part (between the DL transmission period and the UL transmission period) and the last part (after the UL transmission period) of the frame. Transmit / Receive Transition Gap (TGT) is the gap between a DL burst and a subsequent UL burst. Receive / Transmit Transition Gap (RTG) is the gap between a UL burst and a subsequent DL burst.

The preamble is used for initial synchronization, cell search, frequency offset, and channel estimation between the base station and the terminal. The FCH includes the length of the DL-MAP message and the coding scheme information of the DL-MAP. DL-MAP is an area where a DL-MAP message is transmitted. DL-MAP messages define a connection to a DL channel. This means that the DL-MAP message defines the indication and / or control information for the DL channel. The DL-MAP message includes a configuration change count of the downlink channel descriptor (DDC) and a base station identifier (ID). DCD describes a DL burst profile that is applied to the current map. The DL burst profile refers to the characteristics of the DL physical channel, and the DCD is transmitted by the base station periodically through the DCD message. The UL-MAP is an area in which the UL-MAP message is transmitted. The UL-MAP message defines a connection to a UL channel. This means that the UL-MAP message defines the indication and / or control information for the UL channel. The UL-MAP message includes a configuration change count of an uplink channel descriptor (UCD) and an allocation start time of UL allocation defined by UL-MAP. UCD describes an UL burst profile. The UL burst profile refers to the characteristics of the UL physical channel, and the UCD is periodically transmitted by the base station through a UCD message. The DL burst is an area in which data transmitted from the base station to the terminal is transmitted, and the UL burst is an area in which data transmitted from the base station to the terminal is transmitted. The fast feedback region is included in the UL burst region of the frame. The fast feedback area is used for transmission of information requiring a fast response from the base station. The fast feedback region may be used for CQI transmission. The position of the fast feedback region is determined by UL-MAP. The position of the fast feedback region may be a fixed position within the frame or may be a variable position.

5 shows an example of a frame structure of IEEE 802.16m.

Referring to FIG. 5, a superframe (SF) includes a superframe header (SFH) and four frames (frames, F0, F1, F2, and F3). Each frame in the superframe may have the same length. The size of each superframe is 20ms and the size of each frame is illustrated as 5ms, but is not limited thereto. The length of the superframe, the number of frames included in the superframe, the number of subframes included in the frame, and the like may be variously changed. The number of subframes included in the frame may be variously changed according to the channel bandwidth and the length of the cyclic prefix (CP).

One frame includes a plurality of subframes (subframe, SF0, SF1, SF2, SF3, SF4, SF5, SF6, SF7). Each subframe may be used for uplink or downlink transmission. One subframe includes a plurality of orthogonal frequency division multiplexing (OFDM) symbols or an orthogonal frequency division multiple access (OFDMA) in a time domain, and includes a plurality of subcarriers in the frequency domain. do. The OFDM symbol is used to represent one symbol period, and may be called another name such as an OFDMA symbol or an SC-FDMA symbol according to a multiple access scheme. The subframe may be composed of 5, 6, 7 or 9 OFDMA symbols, but this is only an example and the number of OFDMA symbols included in the subframe is not limited. The number of OFDMA symbols included in the subframe may be variously changed according to the channel bandwidth and the length of the CP. A type of a subframe may be defined according to the number of OFDMA symbols included in the subframe. For example, the type-1 subframe may be defined to include 6 OFDMA symbols, the type-2 subframe includes 7 OFDMA symbols, the type-3 subframe includes 5 OFDMA symbols, and the type-4 subframe includes 9 OFDMA symbols. have. One frame may include subframes of the same type. Alternatively, one frame may include different types of subframes. That is, the number of OFDMA symbols included in each subframe in one frame may be the same or different. Alternatively, the number of OFDMA symbols of at least one subframe in one frame may be different from the number of OFDMA symbols of the remaining subframes in the frame.

A TDD scheme or a frequency division duplex (FDD) scheme may be applied to the frame. In the TDD scheme, each subframe is used for uplink transmission or downlink transmission at different times at the same frequency. That is, subframes in a frame of the TDD scheme are classified into an uplink subframe and a downlink subframe in the time domain. In the FDD scheme, each subframe is used for uplink transmission or downlink transmission at different frequencies at the same time. That is, subframes in the frame of the FDD scheme are divided into an uplink subframe and a downlink subframe in the frequency domain. Uplink transmission and downlink transmission occupy different frequency bands and may be simultaneously performed.

The SFH may carry essential system parameters and system configuration information. The SFH may be located in the first subframe in the superframe. SFH may occupy the last five OFDMA symbols of the first subframe. The superframe header may be classified into primary SFH (P-SFH) and secondary SFH (S-SFH; secondary-SFH). The P-SFH may be transmitted every superframe. Information transmitted to the S-SFH can be divided into three subpackets (S-SFH SP1, S-SFH SP2, S-SFH SP3). Each subpacket may be transmitted periodically with a different period. The importance of information transmitted through S-SFH SP1, S-SFH SP2, and S-SFH SP3 may be different from each other. S-SFH SP1 may be transmitted in the shortest period, and S-SFH SP3 may be transmitted in the longest period. S-SFH SP1 includes information on network re-entry, and the transmission period of S-SFH SP1 may be 40 ms. S-SFH SP2 includes information about initial network entry and network discovery, and the transmission period of S-SFH SP2 may be 80 ms. S-SFH SP3 includes the remaining important system information, and the transmission period of S-SFH SP3 may be either 160 ms or 320 ms.

One OFDMA symbol includes a plurality of subcarriers, and the number of subcarriers is determined according to the FFT size. There are several types of subcarriers. The types of subcarriers can be divided into data subcarriers for data transmission, pilot subcarriers for various measurements, guard bands and null carriers for DC carriers. Parameters that characterize an OFDMA symbol are BW, N used , n, G, and the like. BW is the nominal channel bandwidth. N used is the number of subcarriers used (including DC subcarriers). n is a sampling factor. This parameter is combined with BW and N used to determine subcarrier spacing and useful symbol time. G is the ratio of CP time to useful time.

Table 1 below shows OFDMA parameters. The OFDMA parameters of Table 1 may be equally used for the frame structure of 802.16e of FIG. 4.

Channel bandwidth, BW (MHz) 5 7 8.75 10 20 Sampling factor, n 28/25 8/7 8/7 28/25 28/25 Sampling frequency, F s (MHz) 5.6 8 10 11.2 22.4 FFT size, N FFT 512 1024 1024 1024 2048 Subcarrier spacing, Δf (kHz) 10.94 7.81 9.77 10.94 10.94 Useful symbol time, T b (μs) 91.4 128 102.4 91.4 91.4 G = 1/8 Symbol time, T s (μs) 102.857 144 115.2 102.857 102.857 FDD Number of
ODFMA symbols
per 5ms frame
48 34 43 48 48
Idle time (μs) 62.857 104 46.40 62.857 62.857 TDD Number of
ODFMA symbols
per 5ms frame
47 33 42 47 47
TTG + RTG (μs) 165.714 248 161.6 165.714 165.714 G = 1/16 Symbol time, T s (μs) 97.143 136 108.8 97.143 97.143 FDD Number of
ODFMA symbols
per 5ms frame
51 36 45 51 51
Idle time (μs) 45.71 104 104 45.71 45.71 TDD Number of
ODFMA symbols
per 5ms frame
50 35 44 50 50
TTG + RTG (μs) 142.853 240 212.8 142.853 142.853 G = 1/4 Symbol time, T s (μs) 114.286 160 128 114.286 114.286 FDD Number of
ODFMA symbols
per 5ms frame
43 31 39 43 43
Idle time (μs) 85.694 40 8 85.694 85.694 TDD Number of
ODFMA symbols
per 5ms frame
42 30 38 42 42
TTG + RTG (μs) 199.98 200 136 199.98 199.98 Number of Guard subcarriers Left 40 80 80 80 160 Right 39 79 79 79 159 Number of used subcarriers 433 865 865 865 1729 Number of PRU in type-1 subframe 24 48 48 48 96

In Table 1, N FFT is the most small 2 n in the water is greater than N used is the least power (Smallest power of two greater than N used), sampling factor F s = floor (n · BW / 8000) , and × 8000, Subcarrier spacing Δf = F s / N FFT , effective symbol time T b = 1 / Δf, CP time T g = G · T b , OFDMA symbol time T s = T b + T g , and sampling time is T b / N FFT .

Hereinafter, ranging will be described. Ranging means a series of processes for maintaining the quality of the RF communication between the terminal and the base station. By ranging, an accurate timing offset, a frequency offset, and a power adjustment can be obtained, and transmission of the terminal can be aligned with the base station.

6 shows an example of a ranging process of IEEE 802.16e.

In step S100, the terminal receives a UCD message from the base station. In the system, a ranging subchannel and a set of special pseudonoises may be defined. A subset of the specific pseudonoise codes in the UCD message may be allocated for initial initial ranging, periodic ranging or bandwidth request (BR). The base station may determine the purpose of the codes according to the subset to which the codes belong. In this embodiment, a subset of codes for initial ranging may be allocated in a UCD message.

In step S110, the terminal selects one of the ranging codes in the appropriate subset with an equal probability. In addition, the UE selects one ranging slot with the same probability among available ranging slots on the uplink subframe. In selecting one ranging slot, the UE may use random selection or random backoff. When random selection is used, the terminal selects one ranging slot among all slots available in one frame through a uniform random process. When random backoff is used, the terminal selects one ranging slot among all slots available in the corresponding backoff window through a uniform random process. In step S120, the terminal transmits the selected ranging code to the base station through the selected ranging slot.

In step S130, the base station broadcasts a ranging response message including the received ranging code and the ranging slot in which the base station has received the ranging code. The base station does not know which terminal transmitted the ranging code. The terminal transmitting the ranging code by the ranging response message may check the ranging response message corresponding to the ranging code transmitted by the terminal.

In step S140, the base station transmits a CDMA allocation element (IE) to the terminal. The base station may provide a bandwidth for the terminal to transmit a ranging request message by the CDMA assignment IE. In step S150, the terminal transmits a ranging request message to the base station. In step S160, the base station transmits a ranging response message to the terminal, and thus the ranging process ends.

Meanwhile, the contention ranging retries may be defined in the ranging process of FIG. 6. The timer may operate while the terminal waits to receive the ranging response message in step S130 or step S160 or while waiting for the CDMA allocation IE in step S140. The timer may expire when the ranging code transmitted by the terminal collides with the ranging code transmitted by another terminal or is not correctly received from the base station. If the timer expires, the number of contention ranging retries is increased by 1, and the terminal performs the ranging process again from step S100. If the ranging continues to fail and the number of contention retry attempts reaches a predetermined value, the terminal searches for a new channel.

In addition, the UCD message may be transmitted by a base station at regular intervals. The UCD message may include a configuration change count, and the configuration change count in the UCD message does not change unless the UCD message changes. A UL-MAP message that assigns a transmission or reception using a burst profile defined in a UCD message with a given configuration change count has the same UCD count value as the configuration change count in the corresponding UCD message. The configuration change count in the UCD message is incremented by 1 modulo 256 each time a new set of channel descriptors, ie, burst profiles, are created.

7 shows an example of a ranging process of IEEE 802.16m.

In step S200, the terminal receives the SFH from the base station. The UE may obtain system information including DL and UL parameters for initial network entry through the SFH.

In step S210, the UE selects one ranging channel by using a random backoff. In this case, the terminal selects one ranging channel among all the ranging channels available in the corresponding backoff window through a uniform random process. In step S220, the terminal selects the ranging preamble code through a uniform random process. In step S230, the terminal transmits the selected ranging preamble code to the base station through the selected ranging channel.

In step S240, the base station transmits a ranging acknowledgment (ACK) message when at least one ranging preamble code is detected. The ranging ACK message provides a response to the ranging preamble codes that have been successfully received and detected for every ranging opportunity in the frame. The ranging ACK message includes three ranging status responses, 'continue', 'success', and 'abort'. If the ranging status response is 'Continue', the terminal adjusts the parameter according to the ranging ACK message and continues the ranging process. If the ranging status response is 'fail', the terminal operates a ranging failure timer and does not perform a ranging process until the ranging failure timer expires.

In step S250, the base station transmits a CDMA assignment A-MAP IE to the terminal. The base station may provide a bandwidth for the terminal to transmit the ranging request message by the CDMA allocation A-MAP IE. In step S260, the terminal transmits a ranging request message to the base station. In step S270, the base station transmits a ranging response message to the terminal, and thus the ranging process ends.

Like the ranging process of FIG. 6, the ranging retry count may be defined in the ranging process of FIG. 7. The timer may operate while the terminal waits to receive the ranging ACK message of step S240 or the CDMA allocation A-MAP IE of step S250 or the ranging response message of step S270. If the ranging ACK message, the CDMA allocation A-MAP IE or the ranging response message is not received until the timer expires, the terminal performs the ranging process from the beginning again, and the ranging retry count is increased by one. do. If the ranging continues to fail and the number of ranging retries reaches a predetermined value, the terminal retries DL PHY synchronization.

In addition, when the SFH is transmitted, the P-SFH holds S-SFH scheduling information, S-SFH change count, S-SFH subpacket change bitmap, and S-SFH application hold. It includes an application hold indicator. The S-SFH change count does not change unless the values in the S-SFH SP IE change. The S-SFH change count may change only within a specific superframe in which the remainder obtained by dividing the superframe number (SFN) by the S-SFH change cycle is zero. S-SFH change cycle can be indicated by S-SFH IE SP3. The changed S-SFH change cycle is maintained until the superframe satisfying the following condition. The S-SFH change count increases by 1 modulo 16 each time the value in the S-SFH IE changes. The S-SFH SP change bitmap, in conjunction with the S-SFH change count, indicates the state change of the corresponding S-SFH SP IE. The S-SFH SP change bitmap can be 3 bits, the first bit (LSB; Least Significant Bit) is S-SFH SP1 IE, the second bit is S-SFH SP2 IE, and the third bit (MSB; Most Significant Bit) ) Are mapped to S-SFH SP3 IE respectively. If any value in the S-SFH SP IE has changed, the value of the bit corresponding to the changed S-SFH SP IE in the S-SFH SP change bitmap is set to one. The value of the S-SFH SP change bitmap may change only when the S-SFH change count changes.

Hereinafter, a ranging method of the proposed M2M device will be described. The ranging method proposed by the present invention distributes the ranging opportunities of the plurality of M2M devices as much as possible, thereby preventing the plurality of M2M devices from colliding during the ranging attempt.

Table 2 is an example of ranging opportunity configuration parameters configured for the proposed ranging method.

Value Description N A value assigned by the base station according to the network load (the number of M2M devices currently managed by the base station or the number of M2M devices expected to range).
It may be transmitted through a paging message or through signaling for switching to the idle mode of the M2M device.
M2M Device ID -Identifier of the M2M device Opportunity Window Size (M) The size of the ranging opportunity window in which the M2M device may attempt ranging or random access.
It may be the same or different for each M2M device or M2M group.
Opportunity Window Start An offset indicating the starting point of the ranging opportunity.
May be omitted if the starting point of the ranging opportunity is defined by other factors such as group waiting time.

8 shows an example of a ranging opportunity window according to the proposed ranging method.

Referring to FIG. 8, a starting point of a ranging opportunity window may be a time point when a group access time or a group waiting time of an M2M group to which an M2M device belongs is expired. Alternatively, the starting point of the ranging opportunity window may be determined based on an opportunity window start parameter among the ranging opportunity configuration parameters configured by the present invention. That is, the starting point of the ranging opportunity window may be determined according to the offset value determined by the opportunity window starting parameter.

The ranging opportunity of the M2M device may be determined as a position that is (M2M device ID) modulo N in the time domain. Depending on the size of the ranging opportunity window, there may be several ranging opportunities for the M2M device to attempt ranging. At this time, the M2M device attempts ranging by randomly selecting one ranging opportunity from a plurality of corresponding ranging opportunities. That is, the M2M device attempts ranging by randomly selecting any one of the ranging opportunities within a multiple of the M2M Device ID modulo N within the range of the ranging opportunities. In FIG. 8, the ranging is attempted at the second ranging opportunity of the three ranging opportunities. Meanwhile, in the present embodiment, the M2M device ID is a separate value assigned at the time of entering the network or the idle mode for the present invention, or is a DID (deregistration identifier) which is the ID of the M2M device during the idle mode or the M2M during the connected mode. It may be any one of a station identifier (STID) which is an ID of the device.

9 shows an embodiment of a ranging method of the proposed M2M device.

Referring to FIG. 9, it is assumed that three M2M devices constitute one M2M group. The base station transmits a paging message in M2M group units, and recognizes that all M2M devices belonging to the corresponding M2M group should perform ranging when the paging message is received from the base station. Meanwhile, when the ranging opportunity window size M of the ranging opportunity configuration parameters is the same for all M2M devices, M may be transmitted through system information.

The M2M device belonging to the M2M group receives the ranging opportunity configuration parameter from the base station. The M2M device may receive the ranging opportunity configuration parameter in the network entry step of step S100 or in the idle mode entry step of step S101. The ranging opportunity configuration parameter may include N, M2M device ID, M, opportunity window start parameter, etc. as described in Table 2.

In step S120, the M2M device receives a paging message from the base station. The paging message is sent to all M2M devices in the M2M group including the M2M devices. Meanwhile, the ranging opportunity configuration parameter may be transmitted through the paging message.

After receiving the paging message in step S130, the M2M device attempts ranging to the base station. In this case, the ranging method described in FIG. 8 may be applied. That is, the M2M device attempts ranging by randomly selecting any one of the ranging opportunities within a multiple of the M2M Device ID modulo N within the range of the ranging opportunities.

Table 3 is another example of ranging opportunity configuration parameters configured for the proposed ranging method.

Value Description Opportunity Window Size (M) The size of the ranging opportunity window in which the M2M device may attempt ranging or random access.
It may be the same or different for each M2M device or M2M group.
M2M Device ID -Identifier of the M2M device Opportunity Window Start An offset indicating the starting point of the ranging opportunity.
May be omitted if the starting point of the ranging opportunity is defined by other factors such as group waiting time.

10 shows another example of a ranging opportunity window according to the proposed ranging method.

Referring to FIG. 10, a starting point of a ranging opportunity window may be a time point when a group access time or a group waiting time of an M2M group to which an M2M device belongs is expired. Alternatively, the starting point of the ranging opportunity window may be determined based on the opportunity window starting parameter among the ranging opportunity configuration parameters configured by the present invention. That is, the starting point of the ranging opportunity window may be determined according to the offset value determined by the opportunity window starting parameter.

The ranging opportunity of the M2M device may be determined as a position that is modulo M (M2M device ID) in the time domain. Unlike FIG. 8, in FIG. 10, the M2M device attempts ranging at a position corresponding to the remainder obtained by dividing the M2M device ID by M. FIG. In this case, M may be expressed as a start value and an end value. The start value may be 0 as the starting point of the ranging opportunity window and the end value may be M as the end point of the ranging opportunity window. If M is expressed in this manner, the concept of doubling the size of the ranging opportunity window does not apply to avoid collisions in contention-based ranging of M2M devices. Alternatively, when the concept of doubling the size of the ranging opportunity window is applied to avoid collisions in competition-based ranging, the end value may be an end value for a range in which the size of the ranging opportunity window may be increased.

11 shows an embodiment of a ranging method of the proposed M2M device.

Referring to FIG. 11, it is assumed that three M2M devices constitute one M2M group. The base station transmits a paging message in M2M group units, and recognizes that all M2M devices belonging to the corresponding M2M group should perform ranging when the paging message is received from the base station. Meanwhile, when the ranging opportunity window size M of the ranging opportunity configuration parameters is the same for all M2M devices, M may be transmitted through system information.

The M2M device belonging to the M2M group receives the ranging opportunity configuration parameter from the base station. The M2M device may receive the ranging opportunity configuration parameter in the network entry step of step S200 or in the idle mode entry step of step S201. The ranging opportunity configuration parameter may include an M, an M2M device ID, an opportunity window start parameter, and the like as described in Table 3. In this case, M may be expressed as a start value and an end value. The start value may be 0 as the starting point of the ranging opportunity window and the end value may be M as the end point of the ranging opportunity window. Alternatively, when the concept of doubling the size of the ranging opportunity window is applied to avoid collisions in competition-based ranging, the end value may be an end value for a range in which the size of the ranging opportunity window may be increased.

In step S220, the M2M device receives a paging message from the base station. The paging message is sent to all M2M devices in the M2M group including the M2M devices. Meanwhile, the ranging opportunity configuration parameter may be transmitted through the paging message.

After receiving the paging message in step S230, the M2M device attempts ranging to the base station. In this case, the ranging method described in FIG. 10 may be applied. That is, the M2M device attempts ranging at the ranging opportunity corresponding to the M2M Device ID modulo M within the range of the ranging opportunity.

12 is a block diagram of a wireless communication system in which an embodiment of the present invention is implemented.

The base station 800 includes a processor 810, a memory 820, and a radio frequency unit (RF) 830. Processor 810 implements the proposed functions, processes, and / or methods. Layers of the air interface protocol may be implemented by the processor 810. The memory 820 is connected to the processor 810 and stores various information for driving the processor 810. The RF unit 830 is connected to the processor 810 to transmit and / or receive a radio signal.

The M2M device 900 includes a processor 910, a memory 920, and an RF unit 930. Processor 910 implements the proposed functions, processes, and / or methods. Layers of the air interface protocol may be implemented by the processor 910. The memory 920 is connected to the processor 910 and stores various information for driving the processor 910. The RF unit 930 is connected to the processor 910 to transmit and / or receive a radio signal.

Processors 810 and 910 may include application-specific integrated circuits (ASICs), other chipsets, logic circuits, and / or data processing devices. The memory 820, 920 may include read-only memory (ROM), random access memory (RAM), flash memory, memory card, storage medium, and / or other storage device. The RF unit 830 and 930 may include a baseband circuit for processing a radio signal. When the embodiment is implemented in software, the above-described technique may be implemented as a module (process, function, etc.) for performing the above-described function. The module may be stored in the memory 820, 920 and executed by the processor 810, 910. The memories 820 and 920 may be inside or outside the processors 810 and 910, and may be connected to the processors 810 and 910 by various well-known means.

In the exemplary system described above, the methods are described based on a flowchart as a series of steps or blocks, but the invention is not limited to the order of steps, and certain steps may occur in a different order or concurrently with other steps than those described above. Can be. In addition, those skilled in the art will appreciate that the steps shown in the flowcharts are not exclusive and that other steps may be included or one or more steps in the flowcharts may be deleted without affecting the scope of the present invention.

The above-described embodiments include examples of various aspects. While not all possible combinations may be described to represent the various aspects, one of ordinary skill in the art will recognize that other combinations are possible. Accordingly, the invention is intended to embrace all other replacements, modifications and variations that fall within the scope of the following claims.

Claims (14)

  1. In the ranging method by a machine-to-machine (M2M) in a wireless communication system,
    Receiving a ranging opportunity configuration parameter including an M2M device identifier of the M2M device from a base station,
    Receiving a paging message from the base station,
    And ranging to the base station at a ranging opportunity obtained through a modulo operation on the M2M device ID.
  2. The method of claim 1,
    The ranging opportunity configuration parameter includes N allocated by the base station according to a network load,
    And the ranging opportunity is any one selected from a plurality of ranging opportunities obtained through operation of a (M2M device ID) modulo N in a time domain.
  3. The method of claim 2,
    And N is either the number of M2M devices managed by the base station or the number of M2M devices that are expected to be ranging to the base station.
  4. The method of claim 1,
    The ranging opportunity configuration parameter includes a size M of a ranging opportunity window within which the M2M device can attempt ranging;
    And the ranging opportunity is obtained by calculating (M2M device ID) modulo M in a time domain.
  5. The method of claim 1,
    And the M is expressed by a start value and an end value.
  6. The method of claim 1,
    And the ranging opportunity configuration parameter includes a ranging opportunity window starting parameter indicating a starting point of a ranging opportunity window.
  7. The method of claim 1,
    The M2M device ID is any one of a device ID during a idle mode, a station ID (DID), a device ID during a connected mode, or a separate value assigned from the base station. Ranging method.
  8. The method of claim 1,
    And the ranging opportunity configuration parameter is received at a network entry of the M2M device.
  9. The method of claim 1,
    And the ranging opportunity configuration parameter is received when the M2M device enters an idle mode.
  10. The method of claim 1,
    And the ranging opportunity configuration parameter is included in the paging message.
  11. In a wireless communication system,
    RF (Radio Frequency) unit for transmitting or receiving a radio signal; And
    Including a processor connected to the RF unit,
    The processor,
    Receiving a ranging opportunity configuration parameter including an M2M device identifier of the M2M device from a base station,
    Receiving a paging message from the base station,
    Machine-to-Machine (M2M) device configured to attempt ranging to the base station at a ranging opportunity obtained through a modulo operation on the M2M device ID.
  12. The method of claim 11,
    The ranging opportunity configuration parameter includes N allocated by the base station according to a network load,
    The ranging opportunity is any one selected from a plurality of ranging opportunities obtained through the operation of the (M2M device ID) modulo N in the time domain (M2M device).
  13. The method of claim 12,
    The N2 M2M device, characterized in that any one of the number of M2M devices managed by the base station or the number of M2M devices that are expected to range to the base station.
  14. The method of claim 11,
    The ranging opportunity configuration parameter includes a size M of a ranging opportunity window within which the M2M device can attempt ranging;
    The ranging opportunity is obtained by calculating a modulo M (M2M device ID) in the time domain.
PCT/KR2011/009903 2010-12-22 2011-12-21 Ranging method and ranging apparatus in a wireless communication system WO2012087009A2 (en)

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