WO2017073976A1

WO2017073976A1 - Method for transmitting signal having robustness in mobile communication system and apparatus for same

Info

Publication number: WO2017073976A1
Application number: PCT/KR2016/011998
Authority: WO
Inventors: 임동국; 최진수; 조한규; 박은성
Original assignee: 엘지전자 주식회사
Priority date: 2015-10-26
Filing date: 2016-10-25
Publication date: 2017-05-04

Abstract

Disclosed is a method for transmitting a signal having at least a certain level of robustness in a mobile communication system. An information bitstream having a length of N is encoded according to a specific coding rate (1/n) (N and n are natural numbers); and the bitstream which has been encoded is repeated in units of a sequence having a length of M (M is a natural number smaller than N), wherein following an i^th M bit in the bitstream which has been encoded, an M bit, found by scrambling the i^th M bit with the sequence having the length of M, is placed, and following the M bit which has been scrambled, an i+1^th M bit in the bitstream which has been encoded is placed, and the pattern is repeated. As a result, a signal having the at least certain level of robustness can be transmitted by transmitting bitstreams repeated in units of the sequence having the length of M.

Description

Robust signal transmission method and device for same in mobile communication system

This document relates to a mobile communication system, and more particularly, to a method and apparatus for transmitting information of various lengths to have robustness corresponding to MCS 10 in a WLAN system.

The proposed frame transmission method may be applied to various wireless communications, but the following describes a wireless local area network (WLAN) system as an example to which the present invention may be applied.

The standard for WLAN technology is being developed as an Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard. IEEE 802.11a and b are described in 2.4. Using unlicensed band at GHz or 5 GHz, IEEE 802.11b provides a transmission rate of 11 Mbps and IEEE 802.11a provides a transmission rate of 54 Mbps. IEEE 802.11g applies orthogonal frequency-division multiplexing (OFDM) at 2.4 GHz to provide a transmission rate of 54 Mbps. IEEE 802.11n applies multiple input multiple output OFDM (MIMO-OFDM) to provide a transmission rate of 300 Mbps for four spatial streams. IEEE 802.11n supports channel bandwidths up to 40 MHz, in this case providing a transmission rate of 600 Mbps.

The WLAN standard uses a maximum of 160MHz bandwidth, supports eight spatial streams, and supports IEEE 802.11ax standard through an IEEE 802.11ac standard supporting a speed of up to 1Gbit / s.

An object of the present invention is to provide a signal transmission method having more robustness than MCS 0 of a WLAN system in a mobile communication system as described above.

The present invention is not limited to the above-described technical problem and other technical problems can be inferred from the embodiments of the present invention.

In a signal transmission method having a robustness of a certain level or more in a mobile communication system according to an aspect of the present invention for achieving the above-described technical problem, an N-length information bit string according to a predetermined coding rate (1 / n) Encode (N and n are natural numbers), and repeat the encoded bit stream in M-length sequence units (M is a natural number less than N), followed by the i-th M bit following the i-th M bit of the encoded bit stream. M bits in which bits are scrambled by the M length sequence are placed, and the i + 1th M bits of the encoded bit string are repeated following the scrambled M bits, and the M length sequences are repeated. A signal transmission method for transmitting a repeated bit string in units is proposed.

The N may not be a multiple of M, and in this case, repeating the sequence of M lengths may include repetition of the remaining bit strings less than the M length of the encoded bit strings first from the sequence of the M lengths. And arranging the scrambled bits using a sequence component corresponding to the length of the bit string.

In this case, the length M sequence may be [1 0 0 0 0 1 0 1 0 1 1 1] having a length of 12.

N may be a multiple of M, in which case the sequence of length M may have an extended form of a sequence [1 0 0 0 0 1 0 1 0 1 1 1]. In this case, the M-length sequence may be a CAZAC sequence.

The N may be 26, the M may be 13, and the predetermined coding rate (1 / n) may be a coding rate corresponding to MCS 0 of the WLAN system.

The N length information bit string may be an information bit string of HE SIG B.

On the other hand, in another aspect of the present invention, in the apparatus for transmitting a signal having a certain level of robustness (robustness) in the mobile communication system, N-length information bit string is encoded according to a predetermined coding rate (1 / n) ( N and n are natural numbers), and the encoded bit string is repeated in a sequence unit of length M (M is a natural number smaller than N), and the i th M bit is followed by the i th M bit of the encoded bit string. A processor configured to repeat the M bits scrambled by the sequence of M lengths and to repeat in such a manner that the i + 1th M bits of the encoded bit string are disposed following the scrambled M bits; And a transceiver configured to transmit a bit string repeated by the processor in sequence units of the M length.

The N may not be a multiple of M, and in this case, when the processor repeats the sequence unit of the M length, a sequence of the length M of the remaining bit strings less than the length M of the last encoded bit string may be used. It may be configured to place the scrambled bit using a sequence component corresponding to the length of the first remaining bit string of the.

Meanwhile, N may be a multiple of M. In this case, the sequence of length M may have an extended form of a sequence [1 0 0 0 0 1 0 1 0 1 1 1] or a CAZAC sequence.

According to an embodiment of the present invention, it is possible to provide a transmission scheme that is more robust than MCS 0 of a WLAN system for information bits of various lengths, and may bring about the same or similar effects while minimizing changes to the existing MCS 10 transmission scheme. have.

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

1 is a diagram illustrating an example of a configuration of a WLAN system.

2 is a diagram illustrating another example of a configuration of a WLAN system.

3 is a diagram illustrating an exemplary structure of a WLAN system.

4 is a view for explaining a general link setup process.

5 is a diagram for describing an active scanning method and a passive scanning method.

6 to 10 are diagrams for explaining an example of a frame structure used in the IEEE 802.11 system.

11 is a diagram illustrating an example of a high efficiency (HE) PPDU format according to an embodiment of the present invention.

12 is a diagram for describing a method of transmitting HE-SIG B in a broadband according to an embodiment of the present invention.

FIG. 13 is a diagram illustrating a case where a user specific field of HE SIG B is encoded based on grouping according to an embodiment of the present invention.

FIG. 14 illustrates a case where a user specific field of HE SIG B is encoded for each user according to an embodiment of the present invention.

FIG. 15 illustrates a method of configuring HE SIG B in a specific 20 MHz band according to an embodiment of the present invention.

16 is a diagram for describing a method of repeating information bits by reusing an S sequence according to an embodiment of the present invention.

17 is a block diagram illustrating an exemplary configuration of an AP apparatus (or base station apparatus) and a station apparatus (or terminal apparatus) according to an embodiment of the present invention.

18 illustrates an exemplary structure of a processor of an AP device or a station device according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. The detailed description, which will be given below with reference to the accompanying drawings, is intended to explain exemplary embodiments of the present invention and is not intended to represent the only embodiments in which the present invention may be practiced. The following detailed description includes specific details in order to provide a thorough understanding of the present invention. However, one of ordinary skill in the art appreciates that the present invention may be practiced without these specific details.

1 is a diagram illustrating an example of a configuration of a WLAN system.

As shown in FIG. 1, the WLAN system includes one or more basic service sets (BSSs). A BSS is a set of stations (STAs) that can successfully synchronize and communicate with each other.

A station is a logical entity that includes medium access control (MAC) and a physical layer interface to a wireless medium. The station is an access point (AP) and a non-AP station. Include. The portable terminal operated by the user among the stations is a non-AP station, which is simply referred to as a non-AP station. A non-AP station is a terminal, a wireless transmit / receive unit (WTRU), a user equipment (UE), a mobile station (MS), a mobile terminal, or a mobile subscriber. It may also be called another name such as a mobile subscriber unit.

The AP is an entity that provides an associated station with access to a distribution system (DS) through a wireless medium. The AP may be called a centralized controller, a base station (BS), a Node-B, a base transceiver system (BTS), or a site controller.

BSS can be divided into infrastructure BSS and Independent BSS (IBSS).

The BBS shown in FIG. 1 is an IBSS. The IBSS means a BSS that does not include an AP. Since the IBSS does not include an AP, access to the DS is not allowed, thereby forming a self-contained network.

The BSS shown in FIG. 2 is an infrastructure BSS. The infrastructure BSS includes one or more stations and an AP. In the infrastructure BSS, communication between non-AP stations is performed via an AP, but direct communication between non-AP stations is also possible when a direct link is established between non-AP stations.

As shown in FIG. 2, a plurality of infrastructure BSSs may be interconnected through a DS. A plurality of BSSs connected through a DS is called an extended service set (ESS). Stations included in an ESS may communicate with each other, and a non-AP station may move from one BSS to another BSS while communicating seamlessly within the same ESS.

The DS is a mechanism for connecting a plurality of APs. The DS is not necessarily a network, and there is no limitation on the form if it can provide a predetermined distribution service. For example, the DS may be a wireless network such as a mesh network or a physical structure that connects APs to each other.

3 is a diagram illustrating an exemplary structure of a WLAN system. In FIG. 3, an example of an infrastructure BSS including a DS is shown.

In the example of FIG. 3, BSS1 and BSS2 constitute an ESS. In a WLAN system, a station is a device that operates according to MAC / PHY regulations of IEEE 802.11. The station includes an AP station and a non-AP station. Non-AP stations are typically user-managed devices, such as laptop computers and mobile phones. In the example of FIG. 3, station 1, station 3, and station 4 correspond to non-AP stations, and station 2 and station 5 correspond to AP stations.

In the following description, a non-AP station includes a terminal, a wireless transmit / receive unit (WTRU), a user equipment (UE), a mobile station (MS), and a mobile terminal. May be referred to as a Mobile Subscriber Station (MSS). In addition, the AP may include a base station (BS), a node-B, an evolved Node-B (eNB), and a base transceiver system (BTS) in other wireless communication fields. , A concept corresponding to a femto base station (Femto BS).

FIG. 4 is a diagram illustrating a general link setup process, and FIG. 5 is a diagram illustrating an active scanning method and a passive scanning method.

In order for a station to set up a link and transmit and receive data over a network, it first discovers the network, performs authentication, establishes an association, and authenticates for security. It must go through the back. The link setup process may also be referred to as session initiation process and session setup process. In addition, the process of discovery, authentication, association and security establishment of the link setup process may be collectively referred to as association process.

An exemplary link setup procedure will be described with reference to FIG. 4.

In step S410, the station may perform a network discovery operation. The network discovery operation may include a scanning operation of the station. In other words, in order for a station to access a network, it must find a network that can participate. The station must identify a compatible network before joining the wireless network. Network identification in a particular area is called scanning.

There are two types of scanning methods, active scanning and passive scanning. 4 exemplarily illustrates a network discovery operation including an active scanning process, but may operate as a passive scanning process.

In active scanning, a station performing scanning transmits a probe request frame and waits for a response to discover which AP exists in the vicinity while moving channels. The responder transmits a probe response frame in response to the probe request frame to the station transmitting the probe request frame. Here, the responder may be the station that last transmitted the beacon frame in the BSS of the channel being scanned. In the BSS, the AP transmits a beacon frame, so the AP becomes a responder. In the IBSS, the responder is not constant because the stations in the IBSS rotate and transmit the beacon frame. For example, a station that transmits a probe request frame on channel 1 and receives a probe response frame on channel 1 stores the BSS-related information included in the received probe response frame and stores the next channel (for example, number 2). Channel) to perform scanning (i.e., probe request / response transmission and reception on channel 2) in the same manner.

In addition, referring to FIG. 5, the scanning operation may be performed by a passive scanning method. In passive scanning, a station performing scanning waits for a beacon frame while moving channels. Beacon frame is one of the management frame (management frame) in IEEE 802.11, it is transmitted periodically to inform the existence of the wireless network, and to perform the scanning station to find the wireless network and join the wireless network. In the BSS, the AP periodically transmits a beacon frame, and in the IBSS, stations in the IBSS rotate to transmit a beacon frame. When the scanning station receives the beacon frame, the scanning station stores the information about the BSS included in the beacon frame and records beacon frame information in each channel while moving to another channel. The station receiving the beacon frame may store the BSS related information included in the received beacon frame, move to the next channel, and perform scanning on the next channel in the same manner.

Comparing active and passive scanning, active scanning has the advantage of less delay and power consumption than passive scanning.

After the station has found the network, the authentication process may be performed in step S420. This authentication process may be referred to as a first authentication process in order to clearly distinguish from the security setup operation of step S440 described later.

The authentication process includes a process in which the station transmits an authentication request frame to the AP, and in response thereto, the AP transmits an authentication response frame to the station. An authentication frame used for authentication request / response corresponds to a management frame.

The authentication frame includes an authentication algorithm number, an authentication transaction sequence number, a status code, a challenge text, a Robust Security Network, and a finite cyclic group. Group) and the like. This corresponds to some examples of information that may be included in the authentication request / response frame, and may be replaced with other information or further include additional information.

The station may send an authentication request frame to the AP. The AP may determine whether to allow authentication for the corresponding station based on the information included in the received authentication request frame. The AP may provide the station with the result of the authentication process through an authentication response frame.

After the station is successfully authenticated, the association process may be performed in step S430. The association process includes the station transmitting an association request frame to the AP, and in response, the AP transmitting an association response frame to the station.

For example, the association request frame may include information related to various capabilities, beacon listening interval, service set identifier (SSID), supported rates, supported channels, RSN, mobility domain. Information about supported operating classes, TIM Broadcast Indication Map Broadcast request, interworking service capability, and the like.

For example, the association response frame may include information related to various capabilities, status codes, association IDs (AIDs), support rates, Enhanced Distributed Channel Access (EDCA) parameter sets, Received Channel Power Indicators (RCPI), Received Signal to Noise Information) such as an indicator, a mobility domain, a timeout interval (association comeback time), an overlapping BSS scan parameter, a TIM broadcast response, and a QoS map.

This corresponds to some examples of information that may be included in the association request / response frame, and may be replaced with other information or further include additional information.

After the station is successfully associated with the network, a security setup procedure may be performed at step S540. The security setup process of step S540 may be referred to as an authentication process through a Robust Security Network Association (RSNA) request / response. The authentication process of step S520 is called a first authentication process, and the security setup process of step S540 is performed. It may also be referred to simply as the authentication process.

The security setup process of step S540 may include, for example, performing a private key setup through 4-way handshaking through an Extensible Authentication Protocol over LAN (EAPOL) frame. . In addition, the security setup process may be performed according to a security scheme not defined in the IEEE 802.11 standard.

The station STA may receive a Physical Layer Convergence Protocol (PLCP) Packet Data Unit (PPDU). In this case, the PPDU frame format may include a Short Training Field (STF), a Long Training Field (LTF), a SIG (SIGNAL) field, and a Data field. In this case, as an example, the PPDU frame format may be set based on the type of the PPDU frame format.

As an example, the non-HT (High Throughput) PPDU frame format may include only a legacy-STF (L-STF), a legacy-LTF (L-LTF), a SIG field, and a data field.

In addition, the type of the PPDU frame format may be set to any one of the HT-mixed format PPDU and the HT-greenfield format PPDU. In this case, the above-described PPDU format may further include an additional (or other type) STF, LTF, and SIG fields between the SIG field and the data field.

7, a Very High Throughput (VHT) PPDU format may be set. In this case, an additional (or other type) STF, LTF, SIG field may be included between the SIG field and the data field in the VHT PPDU format. More specifically, in the VHT PPDU format, at least one or more of a VHT-SIG-A field, a VHT-STF field, VHT-LTF, and VHT SIG-B field may be included between the L-SIG field and the data field.

In this case, the STF may be a signal for signal detection, automatic gain control (AGC), diversity selection, precise time synchronization, or the like. In addition, the LTF may be a signal for channel estimation, frequency error estimation, or the like. In this case, the STF and the LTF may be referred to as a PLCP preamble, and the PLCP preamble may be referred to as a signal for synchronization and channel estimation of the OFDM physical layer.

In addition, referring to FIG. 8, the SIG field may include a RATE field and a LENGTH field. The RATE field may include information about modulation and coding rate of data. The LENGTH field may include information about the length of data. In addition, the SIG field may include a parity bit, a SIG TAIL bit, and the like.

The data field may include a SERVICE field, a PLC Service Data Unit (PSDU), a PPDU TAIL bit, and may also include a padding bit if necessary.

In this case, referring to FIG. 9, some bits of the SERVICE field may be used for synchronization of the descrambler at the receiving end, and some bits may be configured as reserved bits. The PSDU corresponds to a MAC PDU (Protocol Data Unit) defined in the MAC layer and may include data generated / used in an upper layer. The PPDU TAIL bit can be used to return the encoder to zero. The padding bit may be used to adjust the length of the data field in a predetermined unit.

In addition, as an example, as described above, the VHT PPDU format may include additional (or other types of) STF, LTF, and SIG fields. In this case, L-STF, L-LTF, and L-SIG in the VHT PPDU may be a portion for the Non-VHT of the VHT PPDU. In this case, VHT-SIG-A, VHT-STF, VHT-LTF, and VHT-SIG-B in the VHT PPDU may be a part for the VHT. That is, in the VHT PPDU, a field for the Non-VHT and a region for the VHT field may be defined. In this case, as an example, the VHT-SIG-A may include information for interpreting the VHT PPDU.

At this time, as an example, referring to FIG. 10, VHT-SIG-A may be configured of VHT SIG-A1 (FIG. 10 (a)) and VHT SIG-A2 (FIG. 10 (b)). In this case, the VHT SIG-A1 and the VHT SIG-A2 may be configured with 24 data bits, respectively, and the VHT SIG-A1 may be transmitted before the VHT SIG-A2. At this time, the VHT SIG-A1 may include a BW, STBC, Group ID, NSTS / Partial AID, TXOP_PS_NOT_ALLOWED field, and Reserved field. VHT SIG-A2 also includes Short GI, Short GI NSYM Disambiguation, SU / MU [0] Coding, LDPC Extra OFDM Symbol, SU VHT-MCS / MU [1-3] Coding, Beamformed, CRC, Tail and Reserved fields. It may include. Through this, it is possible to check the information on the VHT PPDU.

HE PPDU 포맷HE PPDU Format

The frame structure for IEEE802.11ax has not been determined yet, but is expected as follows.

11ax maintains the existing 1x symbol structure (3.2us) until the HE-SIG (SIG-A, SIG-B) as shown in the frame structure shown in FIG. 11, and the HE-preamble and Data parts have a 4x symbol (12.8us) structure. You can use a frame structure with Of course, there is no problem in the application of the present invention even if the above-described structure is changed unless directly arranged with the following description.

L-Part can follow the configuration of L-STF, L-LTF, L-SIG as it is maintained in existing WiFi system. In general, the L-SIG preferably transmits packet length information. The HE-Part is a newly constructed part for the 11ax standard (High Efficiency). HE-SIG (HE-SIGA and HE-SIGB) may exist between the L-part and the HE-STF, and may inform common control information and user specific information. Specifically, it may be configured of HE-SIG A for delivering common control information and HE-SIG B for delivering user specific information.

The HE SIG B may be composed of a common field and a user specific field, and may be transmitted in the following manner in a broadband over 40 MHz.

In general, when performing wideband encoding of 40 MHz or more, the HE-SIG B may transmit information independent of each other in two adjacent 20 MHz bands in the 40 MHz band. In addition, the control information transmitted through the above 40 MHz band may be copied to the adjacent 40 MHz band and transmitted.

In FIG. 12, '1' or '2' is a mark for distinguishing independent control information transmitted through two 20 MHz bands in a 40 MHz band, and such control information is expressed in 40 MHz units as shown in FIG. 19. Can be duplicated and transmitted.

As shown in FIG. 12, the HE-SIG B includes a common field for transmitting common control information and a user specific field for transmitting user specific information, and the user specific field may be configured as a plurality of blocks according to the number of users. have.

Meanwhile, the structure of HE SIG B in which encoding is performed for each 20 MHz band may be according to any one of the methods illustrated below.

FIG. 13 illustrates a case in which a user specific field of HE SIG B is encoded based on grouping according to an embodiment of the present invention, and FIG. 14 illustrates a case where a user specific field of HE SIG B is encoded for each user according to an embodiment of the present invention. The case is illustrated.

Specifically, FIG. 13 shows that common information of HE-SIG B is block coded (BCC) in one block, and a CRC / Tail bit is added thereto. In addition, the user specific field shows 'K' (where K is a natural number of 2 or more) groups of users, and thus forms one user block for each grouped user STA.

In contrast, FIG. 14 shows that the user specific field of the HE-SIG B forms one block for each user without the above-described grouping. In some cases, as shown in FIG. 21, one block including common control information and some user specific information may be formed.

In the above examples, whether to add the CRC for each user, for each user group, or to add the CRC to the common information and the user information may vary depending on the situation.

FIG. 15 may be a specific example of grouping two users in grouping a user specific field by a plurality of user units as shown in FIG. 13. In addition, the example of FIG. 15 shows that each block of the user specific field includes CRC and Tail Bits separately.

Meanwhile, when encoding a user specific field based on the grouping as described above, as shown in FIG. 15, there may be one block including control information for the remaining STA, not included in the grouping. As such, padding bits for time domain alignment may be inserted.

MCS information for HE-SIG-B transmitted using the encoding method as described above is transmitted through HE-SIG-A, and MCS0 and MCS1 for MCS used for transmission of HE-SIG-B are determined first. No other MCS was determined. Therefore, the following description proposes a method of configuring low MCS when using low MCS for range extension or robust transmission of HE-SIG-B.

Robust 전송 방식Robust transmission method

For range extension or robust transmission of the SIG field in 11ax, each SIG field is transmitted using the following method.

First, the L-SIG field is transmitted by time repetition of the L-SIG symbol.

In the case of the HE-SIG-A field, two symbols of the HE-SIG-A transmitted for range extension are transmitted by time repetition, and one of two symbols of the repetitioned HE-SIG-A does not pass through the interleaver. You can send without.

However, in case of HE-SIG-B, only encoding method and two MCS (MCS0, MCS1) are defined, and no method for robust transmission or range extension is proposed. It can be a bottleneck. Accordingly, an aspect of the present invention proposes a method of applying MCS more robust than MCS0 to HE-SIG-B for robust transmission or range extension.

To propose such a robust transmission scheme, we first look at the MCS 10 transmission scheme used for robust transmission in the 11ah system.

In 11ah system, MCS 10 is used for robust transmission of 1 MHz PPDU. In this case, 6 bits of information bits of each OFDM symbol are encoded at a coding rate of R = 1/2. Thereafter, 12 bits of encoding bits are repeated block by block in the following manner in each OFDM symbol.

First, [C1,... , C12] is assumed to represent 12 bits of encoding bits. In this case, the output bit stream may be represented as follows.

Equation 1

The sequence S is as follows.

Equation 2

The repeated 24-bit output bits may be input to the BCC interleaver (if using BCC encoding) or to the constellation mapper (if LDPC encoding).

However, there is a problem in applying the MCS 10 method as described above to 11ax as it is.

In 11ax, in order to transmit L-SIG robustly, L-SIG 1symbol is transmitted by time repetition. Repeated L-SIG can be piggybacked with additional bit information unlike the existing L-SIG. Therefore, the HE-SIG-A and HE-SIG-B transmitted after the RL-SIG may also send additional bit information. For example, when a RL-SIG (repeated L-SIG) is transmitted using a 20 MHz frame structure of 11ax, the number of available tones is increased by 4 tones compared to the 11a frame structure, so that 2 bits of information can be transmitted based on MCS0. have. Therefore, the HE-SIG-B field of one symbol may be composed of 26 bits instead of 24 bits.

The HE-SIG-B field information composed of 26 bits may be considered to apply the MCS10 defined in 11ah as described above in order to have more robust characteristics than the MCS0. However, since MCS10 defined in 11ah is applied in units of 12-bit coded bits, the following method can be used to apply 26-bit information HE-SIG-B.

실시예 1Example 1

The information size of the HE-SIG-B is determined to be 26 bits, and the information generates 52 bits of coded bits after encoding by applying MSC0 (code rate 1/2). At this time, in order to apply MCS10 to the generated coded bit, repetition is performed for 12 bits defined in 11ah. Since repetition consists of coded bits of length 12, all 12-bit repetitions cannot be executed for HE-SIG-B. Therefore, repetition such as MCS10 may be applied to the entire coded bit in 12 bit units, and repetition may be performed using a portion of the S sequence having the same length as the length of the remaining bit for the remaining coded bit.

At this time, the S sequence used as a part can be used as much as the remaining bits from the beginning or the end.

As shown in FIG. 16, a coded bit repetitioned by applying MCS10 may be formed using the following method.

Equation 3

In the present embodiment, S may use a sequence defined in 11ah or a newly defined sequence of 12 bit size.

Unlike the above structure, the repeated bit block may not be located after the existing coded bit, but may be transmitted by scramble / interleaving the coded bit in a length unit for applying repetition in the structure.

실시예 2Example 2

Repetition is performed in 13-bit units for the 52-bit coded bit generated by applying MCS0 (1/2 rate) to the 26-bit HE-SIG-B. The MCS10 applied at this time may be defined as follows.

Equation 4

In this case, S is composed of a sequence having a length of 13 and the sequence may be defined as follows.

First, 1 bit can be added to a 12-bit S sequence. Specifically, 1/0 1bit can be added to the beginning or the end of S, and a 13bit sequence that can reduce PAPR that can be increased due to repeated information during repletion can be generated and repetition in 13bit units. .

The sequence may use a CAZAC sequence with less PAPR characteristics.

In addition, 13 bits may be configured by cyclic shifting the existing 12 bit sequence.

By performing the repetition as described above, it is preferable to have a structure in which two blocks are repeated in one OFDM symbol.

실시예 3Example 3

In this case, repetition may be performed in units of 26 bit coded bits to apply MCS10 to the HE-SIG-B using the same method as in the second embodiment. Therefore, the S sequence for 26 bits is defined and used for repetition in units of 26 bits. In this case, the 26 bits may use the CAZAC sequence in consideration of PAPR. You can also generate the 12-bit S defined in 11ah repeatedly.

By performing such a repetition, a signal can be transmitted using a structure in which one block is repeated in one OFDM symbol.

실시예 4Example 4

In the above embodiments 1 to 3, unlike the XOR of the S sequence to the coded bit for repetition, the interleaving may be repeated for the coded bit corresponding to the repetition size.

Interleaving over the repetition bit is performed within the repetition size and is performed in consideration of the modulation order. Accordingly, the coded bit formed by the above method may be configured as follows, for example, assuming a repetition size of 13.

Equation 5

Unlike the method of attaching a repeated block to an existing code block as described above, a coded bit formed through repetition may be transmitted by performing scramble or interleaving once again in a repeating bit size / block unit.

Coded bits generated through the repetition proposed in Examples 1 to 4 may be interleaved on a symbol basis or may be directly constellation mapped without interleaving.

실시예 5Example 5

Unlike repetition of the coded bit generated using the information bit and MCS0 (1/2 rate), the repetition size (ex, 13, 26, etc) for applying MCS10 may be determined. The information bit and encoding rate can be changed to generate a coded bit for a specified repetition size.

For example, when the repetition size is 13, 6/13 may be used when 6bit information is used, and 7/13 may be used when 7bit information is used.

The information size and encoding rate are just examples, and various information sizes and coding rates may be used to perform a predetermined coded bit size repetition.

In addition, the S sequence for repetition used can be constructed using the methods proposed above.

다양한 정보 비트에 적용Applies to various information bits

The MCS10 application method proposed for robust transmission of HE-SIG-B as described above may be applied to HE-PPDU, that is, data.

In addition, it can be used for robust transmission of transmission signals in various mobile communication systems as well as IEEE 802.11 based systems. That is, an arbitrary N length information bit string is encoded according to a predetermined coding rate (1 / n) (N and n are natural numbers), and the encoded bit string is repeated in M length sequence units (M is smaller than N). Natural number), the repetition method can be applied as the repetition method using the above-described S sequence.

In this case, N may be a multiple of M, but may not be a multiple of M. When N is not a multiple of M, the process may be repeated as in Embodiment 1 described above, and the repetition of the remaining bit strings may be processed, or a sequence in which N is a multiple of M may be generated and used.

The AP 100 may include a processor 110, a memory 120, and a transceiver 130. The station 150 may include a processor 160, a memory 170, and a transceiver 180.

The

transceivers

130 and 180 may transmit / receive radio signals and may implement, for example, a physical layer in accordance with the IEEE 802 system. The

processors

110 and 160 may be connected to the

transceivers

130 and 180 to implement a physical layer and / or a MAC layer according to the IEEE 802 system.

Processors

110 and 160 may be configured to perform operations in accordance with one or more combinations of the various embodiments of the invention described above. In addition, the modules for implementing the operations of the AP and the station according to various embodiments of the present invention described above may be stored in the

memory

120 and 170 and executed by the

processors

110 and 160. The

memories

120 and 170 may be included in the

processors

110 and 160 or may be installed outside the

processors

110 and 160 and connected to the

processors

110 and 160 by a known means.

The above descriptions of the AP device 100 and the station device 150 may be applied to a base station device and a terminal device in another wireless communication system (eg, LTE / LTE-A system).

The detailed configuration of the AP and the station apparatus as described above, may be implemented to be applied independently or the two or more embodiments described at the same time described in the various embodiments of the present invention, overlapping description is omitted for clarity do.

The processor of an AP or station may have a plurality of layer structures, and FIG. 18 intensively focuses on the MAC sublayer 3810 and the physical layer 3820 among these layers, particularly on a Data Link Layer (DLL). Represented by As shown in FIG. 18, the PHY 3820 may include a Physical Layer Convergence Procedure (PLCP) entity 3811 and a Physical Medium Dependent (PMD) entity 3822. Both the MAC sublayer 3810 and the PHY 3820 each contain management entities conceptually referred to as a MAC sublayer management entity (MLME) 3811. These

entities

3811 and 3821 provide a layer management service interface on which layer management functions operate.

In order to provide correct MAC operation, a Station Management Entity (SME) 3830 exists within each station. SME 3830 is a layer-independent entity that may appear within a separate management plane or appear to be off to the side. Although the precise functions of the SME 3830 are not described in detail herein, in general, this entity 3830 collects layer-dependent states from various Layer Management Entities (LMEs) and values of layer-specific parameters. It can be seen that it is responsible for such functions as setting. SME 3830 can generally perform these functions on behalf of a generic system management entity and implement standard management protocols.

The entities shown in FIG. 18 interact in various ways. 18 shows some examples of exchanging GET / SET primitives. The XX-GET.request primitive is used to request the value of a given MIB attribute (management information based attribute information). The XX-GET.confirm primitive is used to return the appropriate MIB attribute information value if the Status is "Success", otherwise it is used to return an error indication in the Status field. The XX-SET.request primitive is used to request that the indicated MIB attribute be set to a given value. If the MIB attribute means a specific operation, this is to request that the operation be performed. And, the XX-SET.confirm primitive confirms that the indicated MIB attribute is set to the requested value when status is "success", otherwise it is used to return an error condition in the status field. If the MIB attribute means a specific operation, this confirms that the operation has been performed.

As shown in FIG. 18, the MLME 3811 and the SME 3830 can exchange various MLME_GET / SET primitives through the MLME_SAP 3850. In addition, various PLCM_GET / SET primitives can be exchanged between PLME 3821 and SME 3830 via PLME_SAP 3860, and MLME 3811 and PLME 3870 via MLME-PLME_SAP 3870. Can be exchanged between.

Embodiments of the present invention described above may be implemented through various means. For example, embodiments of the present invention may be implemented by hardware, firmware, software, or a combination thereof.

For implementation in hardware, a method according to embodiments of the present invention may include one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), and Programmable Logic Devices (PLDs). It may be implemented by field programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, and the like.

In the case of an implementation by firmware or software, the method according to the embodiments of the present invention may be implemented in the form of a module, a procedure, or a function that performs the functions or operations described above. The software code may be stored in a memory unit and driven by a processor. The memory unit may be located inside or outside the processor, and may exchange data with the processor by various known means.

The detailed description of the preferred embodiments of the invention disclosed as described above is provided to enable any person skilled in the art to make and practice the invention. Although the above has been described with reference to the preferred embodiments of the present invention, those skilled in the art will variously modify and change the present invention without departing from the spirit and scope of the invention as set forth in the claims below. I can understand that you can. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein. In addition, while the preferred embodiments of the present specification have been shown and described, the present specification is not limited to the specific embodiments described above, and the technical field to which the present invention belongs without departing from the gist of the present specification claimed in the claims. Of course, various modifications can be made by those skilled in the art, and these modifications should not be individually understood from the technical spirit or prospect of the present specification.

In the present specification, both the object invention and the method invention are described, and the description of both inventions may be supplementarily applied as necessary.

As described above, embodiments of the present invention can be applied to various wireless communication systems, including IEEE 802.11 systems.

Claims

In the signal transmission method having a robustness (robustness) of a certain level or more in a mobile communication system,

Encode an information bit string of length N according to a predetermined coding rate (1 / n) (where N and n are natural numbers),

Repeating the encoded bit string in M-length sequence units (M is a natural number less than N), wherein the i-th M bit is scrambled by the M-length sequence following the i-th M bit of the encoded bit string. Repeated M bits are arranged, and the i + 1 th M bits of the encoded bit string are repeated following the scrambled M bits.

And transmitting the repeated bit string in the sequence unit of length M.
The method of claim 1,

N is not a multiple of M,

Repeating the M-length sequence unit may include: scrambled the remaining bit strings of the encoded bit strings less than the M length by using a sequence component corresponding to the length of the first remaining bit strings of the M length sequences. And disposing a signal transmission method.
The method of claim 2,

And the M-length sequence is [1 0 0 0 0 1 0 1 0 1 1 1] having a length of 12.
The method of claim 1,

N is a multiple of M,

The sequence of length M has a extended form of the sequence [1 0 0 0 0 1 0 1 0 1 1 1].
The method of claim 1,

N is a multiple of M,

And the M length sequence is a CAZAC sequence.
The method of claim 1,

N is 26, M is 13,

The predetermined coding rate (1 / n) is a coding rate corresponding to MCS 0 of the WLAN system.
The method of claim 1,

And the N length information bit string is an information bit string of HE SIG B.
In the device for transmitting a signal having a certain level of robustness (robustness) in a mobile communication system,

Encode an information bit string of length N according to a predetermined coding rate (1 / n) (N and n are natural numbers), and repeat the encoded bit strings in a sequence unit of length M (M is a natural number less than N), M bits of which the i-th M bits are scrambled by the sequence of M lengths are disposed after the i-th M bits of the encoded bit string, and i + of the encoded bit strings subsequent to the scrambled M bits. A processor configured to repeat the manner in which the first M bits are placed; And

And a transceiver configured to transmit a bit string repeated by the processor in sequence units of the M length.
The method of claim 8,

N is not a multiple of M,

When the processor repeats the sequence of the length M, the processor uses a sequence component corresponding to the length of the first remaining bit string of the M length sequence to the remaining bit string of the encoded bit string that is less than the M length. And arrange the scrambled bits.
The method of claim 9,

And the M-length sequence is [1 0 0 0 0 1 0 1 0 1 1 1] having a length of 12.
The method of claim 8,

N is a multiple of M,

And the sequence of length M has an extended form of sequence [1 0 0 0 0 1 0 1 0 1 1 1].
The method of claim 8,

N is a multiple of M,

And the M length sequence is a CAZAC sequence.
The method of claim 8,

N is 26, M is 13,

And the predetermined coding rate (1 / n) is a coding rate corresponding to MCS 0 of a WLAN system.
The method of claim 8,

And the N length information bit string is an information bit string of HE SIG B.