WO2017073976A1 - Procédé pour émettre un signal ayant une certaine robustesse dans un système de communication mobile et appareil associé - Google Patents

Procédé pour émettre un signal ayant une certaine robustesse dans un système de communication mobile et appareil associé Download PDF

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Publication number
WO2017073976A1
WO2017073976A1 PCT/KR2016/011998 KR2016011998W WO2017073976A1 WO 2017073976 A1 WO2017073976 A1 WO 2017073976A1 KR 2016011998 W KR2016011998 W KR 2016011998W WO 2017073976 A1 WO2017073976 A1 WO 2017073976A1
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length
sequence
bits
bit string
sig
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PCT/KR2016/011998
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English (en)
Korean (ko)
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임동국
최진수
조한규
박은성
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엘지전자 주식회사
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received

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  • 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.
  • WLAN wireless local area network
  • 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.
  • 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.
  • the length M sequence may be [1 0 0 0 0 1 0 1 0 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].
  • 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.
  • 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.
  • the length M sequence may be [1 0 0 0 0 1 0 1 0 1 1] having a length of 12.
  • N may be a multiple of M.
  • the sequence of length M may have an extended form of a sequence [1 0 0 0 0 1 0 1 0 1 1] or 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.
  • FIG. 1 is a diagram illustrating an example of a configuration of a WLAN system.
  • FIG. 2 is a diagram illustrating another example of a configuration of a WLAN system.
  • FIG. 3 is a diagram illustrating an exemplary structure of a WLAN system.
  • FIG. 4 is a view for explaining a general link setup process.
  • FIG. 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.
  • FIG. 11 is a diagram illustrating an example of a high efficiency (HE) PPDU format according to an embodiment of the present invention.
  • HE high efficiency
  • FIG. 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.
  • FIG. 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.
  • FIG. 18 illustrates an exemplary structure of a processor of an AP device or a station device according to an embodiment of the present invention.
  • FIG. 1 is a diagram illustrating an example of a configuration of a WLAN system.
  • the WLAN system includes one or more basic service sets (BSSs).
  • 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.
  • BS base station
  • BTS base transceiver system
  • BSS can be divided into infrastructure BSS and Independent BSS (IBSS).
  • IBSS Independent BSS
  • 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.
  • FIG. 2 is a diagram illustrating another example of a configuration of a WLAN system.
  • the BSS shown in FIG. 2 is an infrastructure BSS.
  • the infrastructure BSS includes one or more stations and an AP.
  • 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.
  • 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.
  • the DS may be a wireless network such as a mesh network or a physical structure that connects APs to each other.
  • FIG. 3 is a diagram illustrating an exemplary structure of a WLAN system.
  • an example of an infrastructure BSS including a DS is shown.
  • BSS1 and BSS2 constitute an ESS.
  • 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.
  • station 1, station 3, and station 4 correspond to non-AP stations
  • station 2 and station 5 correspond to AP stations.
  • 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).
  • 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.
  • BS base station
  • eNB evolved Node-B
  • BTS base transceiver system
  • FIG. 4 is a diagram illustrating a general link setup process
  • FIG. 5 is a diagram illustrating an active scanning method and a passive scanning method.
  • a station 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.
  • the process of discovery, authentication, association and security establishment of the link setup process may be collectively referred to as association process.
  • 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.
  • 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.
  • the responder may be the station that last transmitted the beacon frame in the BSS of the channel being scanned.
  • the AP transmits a beacon frame, so the AP becomes a responder.
  • the responder is not constant because the stations in the IBSS rotate and transmit the beacon frame.
  • 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.
  • the scanning operation may be performed by a passive scanning method.
  • 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.
  • the AP periodically transmits a beacon frame
  • stations in the IBSS rotate to transmit a beacon frame.
  • 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.
  • active scanning has the advantage of less delay and power consumption than passive scanning.
  • step S420 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.
  • 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.
  • 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.
  • 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.
  • AIDs association IDs
  • EDCA Enhanced Distributed Channel Access
  • RCPI Received Channel Power Indicators
  • 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.
  • 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.
  • RSNA Robust Security Network Association
  • 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. .
  • the security setup process may be performed according to a security scheme not defined in the IEEE 802.11 standard.
  • 6 to 10 are diagrams for explaining an example of a frame structure used in the IEEE 802.11 system.
  • the station STA may receive a Physical Layer Convergence Protocol (PLCP) Packet Data Unit (PPDU).
  • PLCP Physical Layer Convergence Protocol
  • PPDU frame format may include a Short Training Field (STF), a Long Training Field (LTF), a SIG (SIGNAL) field, and a Data field.
  • STF Short Training Field
  • LTF Long Training Field
  • SIGNAL SIG
  • Data field a Data field
  • the PPDU frame format may be set based on the type of the PPDU frame format.
  • 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.
  • L-STF legacy-STF
  • L-LTF legacy-LTF
  • SIG field SIG field
  • data field data field
  • 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.
  • 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.
  • VHT Very High Throughput
  • 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.
  • 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.
  • the STF may be a signal for signal detection, automatic gain control (AGC), diversity selection, precise time synchronization, or the like.
  • the LTF may be a signal for channel estimation, frequency error estimation, or the like.
  • 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.
  • 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.
  • 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.
  • PSDU PLC Service Data Unit
  • PPDU TAIL bit PLC Service Data Unit
  • 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.
  • the VHT PPDU format may include additional (or other types of) STF, LTF, and SIG fields.
  • L-STF, L-LTF, and L-SIG in the VHT PPDU may be a portion for the Non-VHT of the VHT PPDU.
  • 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.
  • the VHT-SIG-A may include information for interpreting the VHT PPDU.
  • VHT-SIG-A may be configured of VHT SIG-A1 (FIG. 10 (a)) and VHT SIG-A2 (FIG. 10 (b)).
  • 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.
  • 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.
  • the frame structure for IEEE802.11ax has not been determined yet, but is expected as follows.
  • FIG. 11 is a diagram illustrating an example of a high efficiency (HE) PPDU format according to an embodiment of the present invention.
  • HE high efficiency
  • 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.
  • L-Part can follow the configuration of L-STF, L-LTF, L-SIG as it is maintained in existing WiFi system.
  • 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.
  • FIG. 12 is a diagram for describing a method of transmitting HE-SIG B in a broadband according to an embodiment of the present invention.
  • the HE-SIG B may transmit information independent of each other in two adjacent 20 MHz bands in the 40 MHz band.
  • the control information transmitted through the above 40 MHz band may be copied to the adjacent 40 MHz band and transmitted.
  • '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.
  • 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.
  • 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
  • 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.
  • 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.
  • 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.
  • FIG. 14 shows that the user specific field of the HE-SIG B forms one block for each user without the above-described grouping.
  • one block including common control information and some user specific information may be formed.
  • 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 illustrates a method of configuring HE SIG B in a specific 20 MHz band according to an embodiment of the present invention.
  • 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.
  • the example of FIG. 15 shows that each block of the user specific field includes CRC and Tail Bits separately.
  • 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.
  • each SIG field is transmitted using the following method.
  • the L-SIG field is transmitted by time repetition of the L-SIG symbol.
  • 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.
  • 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.
  • MCS 10 is used for robust transmission of 1 MHz PPDU.
  • 12 bits of encoding bits are repeated block by block in the following manner in each OFDM symbol.
  • [C1,... , C12] is assumed to represent 12 bits of encoding bits.
  • the output bit stream may be represented as follows.
  • the sequence S is as follows.
  • 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).
  • 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.
  • 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.
  • 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).
  • MSC0 code rate 1/2
  • 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.
  • the S sequence used as a part can be used as much as the remaining bits from the beginning or the end.
  • 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.
  • a coded bit repetitioned by applying MCS10 may be formed using the following method.
  • S may use a sequence defined in 11ah or a newly defined sequence of 12 bit size.
  • 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.
  • 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.
  • S is composed of a sequence having a length of 13 and the sequence may be defined as follows.
  • 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.
  • 13 bits may be configured by cyclic shifting the existing 12 bit sequence.
  • 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.
  • a signal can be transmitted using a structure in which one block is repeated in one OFDM symbol.
  • the interleaving may be repeated for the coded bit corresponding to the repetition size.
  • the coded bit formed by the above method may be configured as follows, for example, assuming a repetition size of 13.
  • 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.
  • 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.
  • 6/13 may be used when 6bit information is used
  • 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.
  • the MCS10 application method proposed for robust transmission of HE-SIG-B as described above may be applied to HE-PPDU, that is, data.
  • 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.
  • N may be a multiple of M, but may not be 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.
  • FIG. 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.
  • 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.
  • 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).
  • LTE / LTE-A system another wireless communication 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.
  • FIG. 18 illustrates an exemplary structure of a processor of an AP device or a station device according to an embodiment of the present invention.
  • 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).
  • the PHY 3820 may include a Physical Layer Convergence Procedure (PLCP) entity 3811 and a Physical Medium Dependent (PMD) entity 3822.
  • PLCP Physical Layer Convergence Procedure
  • PMD Physical Medium Dependent
  • Both the MAC sublayer 3810 and the PHY 3820 each contain management entities conceptually referred to as a MAC sublayer management entity (MLME) 3811.
  • MLME MAC sublayer management entity
  • SME 3830 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.
  • LMEs Layer Management Entities
  • 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.
  • 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.
  • the MLME 3811 and the SME 3830 can exchange various MLME_GET / SET primitives through the MLME_SAP 3850.
  • 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.
  • embodiments of the present invention may be implemented by hardware, firmware, software, or a combination thereof.
  • 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.
  • ASICs Application Specific Integrated Circuits
  • DSPs Digital Signal Processors
  • DSPDs Digital Signal Processing Devices
  • PLDs Programmable Logic Devices
  • FPGAs field programmable gate arrays
  • processors controllers, microcontrollers, microprocessors, and the like.
  • 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.
  • embodiments of the present invention can be applied to various wireless communication systems, including IEEE 802.11 systems.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé pour émettre un signal ayant au moins un certain niveau de robustesse dans un système de communication mobile. Un train de bits d'informations ayant une longueur de N est codé selon un taux de codage spécifique (1/n) (N et n sont des nombres entiers naturels) ; et le train de bits qui a été codé est répété dans des unités d'une séquence ayant une longueur de M (M est un nombre entier naturel plus petit que N), après un iième bit M dans le train de bits qui a été codé, un bit M, trouvé par embrouillage du iième bit M avec la séquence ayant la longueur de M, étant placé, et après le bit M qui a été embrouillé, un i+1ième bit M dans le train de bits qui a été codé étant placé, et le motif étant répété. En conséquence, un signal ayant lesdits certains niveaux de robustesse peut être émis par transmission de trains de bits répétés dans des unités de la séquence ayant la longueur de M.
PCT/KR2016/011998 2015-10-26 2016-10-25 Procédé pour émettre un signal ayant une certaine robustesse dans un système de communication mobile et appareil associé WO2017073976A1 (fr)

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