Techniques for pre- and post-forward error correction and packet padding in wireless transmission

Abstract

To improve the performance of wireless transmission using an advanced communication method, for example, EHT WiFi according to IEEE802.11be.SOLUTION: The present disclosure relates to a communication device (100) configured to transmit and / or receive data frames based on a set of pre-post forward error correction (FEC) parameters and a set of packet extension PE parameters, where the set of pre-post FEC parameters is based on an extension of the set of pre-post FEC parameters defined for a second wireless transmission technique with respect to the size of a resource unit (RU) supported by a first wireless transmission technique, the set of pre-post FEC parameters is based on a combination of RUs supported by the first wireless transmission technique, and the set of PE parameters is based on an extension of the set of PE parameters defined for the second wireless transmission technique.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] This disclosure relates to techniques for pre-forward error correction (FEC), post-forward error correction and packet padding in wireless transmissions. In particular, this disclosure relates to WiFi wireless transmissions and to packet extension (PE) and pre / post FEC padding in WiFi wireless transmissions. [Background technology]

[0002] In wireless transmissions using Orthogonal Frequency Division Multiplex (OFDM), some padding that does not contain any information is inserted at the end of the packet to ease the processing requirements. This padding artificially increases the packet size so that the receiver can complete the decoding process. In wireless communications by WiFi standards, e.g. IEEE802.11ax, Packet Extension (PE) and Pre-Post FEC were introduced to ease the processing requirements. These two mechanisms were introduced based on certain requirements regarding the number of spatial streams, Resource Unit (RU) size and Quadrature Amplitude Modulation (QAM) size. When a new version of a wireless communication standard is introduced, e.g. IEEE802.11be for WiFi, these original requirements regarding the number of spatial streams, RU size and QAM size need to be updated by introducing additional values.

[0003] As new standards, especially IEEE 802.11be, seek to support higher numbers in terms of number of spatial streams, RU size and QAM size, the definition, signaling and usage of PE as well as pre- and post-FEC padding needs to be revised. Summary of the Invention

[0004] An object of the present disclosure is to provide techniques for improving the performance of wireless transmissions in advanced communication systems such as Extreme High Throughput (EHT) WiFi according to IEEE 802.11be.

[0005] In particular, an objective of this disclosure is to update the definition, signaling and usage of PE and pre- and post-FEC padding in new wireless transmission standards, such as EHT WiFi per IEEE 802.11be.

[0006] This object is achieved by means of the features of the independent claims. Further implementations emerge from the dependent claims, the description and the figures.

[0007] The basic idea of ​​the present disclosure is to apply a new definition of packet extension and pre- and post-forward error correction (FEC) padding to comply with new wireless transmission standards (e.g., EHT WiFi) according to, for example, IEEE 802.11be.

[0008] The appropriate pre- and post-FEC and packet extension mechanisms are designed specifically for IEEE802.11be, based on the mechanisms defined in the current standard IEEE802.11ax (IEEE802.11-15 / 0810, September 2015: HE PHY Padding and Packet Extension), which are not suitable for the new features being added to the new standard.

[0009] IEEE 802.11be introduces three aspects that require adaptation of pre- and post-FEC parameters: 240 MHz bandwidth (achieved by puncturing 80 MHz within the 320 MHz BW) and / or 320 MHz bandwidth, multi-RU, and 4K-QAM. To evaluate these aspects, this disclosure considers the requirement to maintain integer values ​​and considers the N SD_Short potential values ​​of and N CBPS_Short , N DBPS_Short and N DBPS_Short / NES By verifying link-level simulations, we demonstrate the effect of N SD_Short It can be shown that there is no practical impact of slightly modifying the value of N. In this disclosure, BCC is limited to ≦242 tone RUs (hence the integer N DBPS_Short / N ES The values ​​are chosen to work with or without DCM, taking into account the fact that the DCM requires

[0010] To describe the present invention in detail, the following terms, abbreviations and notations are used. FEC Forward Error Correction Post-FEC Post-forward error correction Pre-FEC Pre-forward error correction PE Packet Extensions OFDM Orthogonal Frequency Division Multiplexing OFDMA Orthogonal Frequency Division Multiple Access QAM Quadrature Amplitude Modulation BW Bandwidth N SD_Short Number of subcarriers per symbol N CBPS_Short Number of coded bits per symbol N DBPS_Short Number of data bits per symbol RU Resource Unit STA Station in WiFi notation AP Access Point in WiFi notation EHT Ultra-high throughput SIFS Short Interframe Space PPDU Physical Protocol Data Unit Resource Unit (RU) is a unit of OFDMA terminology used in WiFi systems to represent a group of subcarriers (tones) used for both downlink (DL) and uplink (UL) transmission. In OFDMA, different transmission powers may be applied to different RUs. There are up to 9 RUs in a 20 MHz bandwidth, 18 in a 40 MHz bandwidth, and more in an 80 MHz or 160 MHz bandwidth. These RUs make the access point available for multiple users to access it simultaneously and efficiently.

[0011] Short Interframe Space (SIFS) is the time, in microseconds, required for the air interface to process a received frame and respond with a response frame. It is the time difference between the first symbol of the response frame in the air and the last symbol of the received frame in the air.

[0012] In this disclosure, pre- and post-forward error correction (FEC) parameters, also abbreviated as cFEC parameters or pre / post-FEC parameters, are described. Pre-FEC parameters relate to pre-FEC padding and corresponding pre-FEC padding bits. Post-FEC parameters relate to post-FEC padding and corresponding post-FEC padding bits. Pre-FEC padding is performed before forward error correction (FEC) and post-FEC padding is performed after forward error correction (FEC), for example according to the diagram illustrated in FIG. 1. Although this disclosure defines the terms pre- and post-FEC and pre / post-FEC parameters, these terms should be understood to mean pre- and / or post-FEC parameters, i.e., to include three cases: 1) both pre-FEC padding and post-FEC padding are applied, 2) only post-FEC padding is applied, and 3) only pre-FEC padding is applied.

[0013] According to a first aspect, the present disclosure relates to a communications device configured to transmit and / or receive data frames based on a set of pre- and post-forward error correction (FEC) parameters and a set of packet extension PE parameters, where the set of pre- and post-FEC parameters is based on an extension of the set of pre- and post-FEC parameters defined for a second radio transmission technology with respect to a size of resource unit (RU) supported by the first radio transmission technology, where the set of pre- and post-FEC parameters is based on a combination of RUs supported by the first radio transmission technology, and where the set of PE parameters is based on an extension of the set of PE parameters defined for the second radio transmission technology with respect to a constellation size, a number of total space-time streams, and a resource unit (RU) allocation size supported by the first radio transmission technology.

[0014] By transmitting / receiving data frames based on such new definitions of pre- and post-FEC parameters and PE parameters, the communication device improves the performance of wireless transmission in advanced communication schemes, e.g., EHT WiFi according to IEEE 802.11be. This new definition of packet extension and pre- and post-forward error correction padding complies with new wireless transmission standards, e.g., EHT WiFi according to IEEE 802.11be.

[0015] The first and second wireless transmission technologies may be WiFi technologies, and the second wireless transmission technology may be an existing WiFi technology, but the first wireless technology may be a new WiFi technology, e.g., a new WiFi technology having a larger bandwidth, multiple resource units, and / or a higher constellation scheme. For example, the first wireless transmission technology may be 802.11be WiFi, and the second wireless transmission technology may be 802.11ax WiFi.

[0016] The first and second wireless transmission technologies may be the same (having different settings) or different (having different capabilities).

[0017] A number of RUs defined by the new first radio transmission technology are formed from a combination of two or more RUs defined by the older second radio transmission technology.

[0018] In an exemplary implementation of the communications device, the communications device is configured to determine where in the data frame the post-padding begins based on a set of pre- and post-FEC parameters, the set of pre- and post-FEC parameters being an extension N SD_Short An integer number N of data subcarriers for the last symbol of a data frame, defined by the table SD_Short And the extension N SD_Short The table is based on the N SD_Short N defined by the second radio transmission technology with respect to additional values ​​of SD_Short An extension of the table, N SD_Short and an integer number of coded bits per symbol, N, for the last symbol of the data frame. CBPS_Short And N CBPS_Short is N SD_Short Depends on N CBPS_Short and an integer number of data bits per symbol, N, for the last symbol of the data frame. DBPS_Short And N DBPS_Short is N CBPS_Short Depends on N DBPS_Short It is based on.

[0019] This has the advantage that the set of pre- and post-FEC parameters indicates where in the data frame the post-padding starts and hence by using that information the post-padding can be implemented efficiently.

[0020] Four pre-FEC padding boundaries divide the last OFDM symbol of the HE and EHT PPDUs (or the last two symbols if space-time coding is used) into four symbol segments. The pre-FEC padding may pad towards one of the four possible boundaries. In this case, the post-FEC padding bits are used to pad the remaining symbol segments. In other words, the pre-FEC padding bits ensure that the FEC output bits of the last OFDM symbol end on one of the four segment boundaries, as exemplarily illustrated in FIG. 2.

[0021] The pre-post FEC parameters are also called "pre-post FEC padding parameters" because they are the parameters that set the quantity of padding bits for the last symbol of a data frame (or the last two symbols of a data frame when space-time coding is applied). In pre-post FEC padding, 1 / 4 parts of the last OFDM symbol (i.e. 1 / 4, 1 / 2, 3 / 4) are padded after encoding and these parts do not need to be decoded.

[0022] In an exemplary implementation of the communications device, a set of pre- and post-FEC parameters is defined for a second wireless transmission technology with respect to a combination of RU values ​​supported by the first wireless transmission technology, n SD_Short Based on the extension of the table, N SD_Short The table is a predefined number of N SD_Short Contains a value.

[0023] This is the expansion N SD_Short The table is an existing SD_Short The advantage is that it can be easily derived from a table and efficiently used to implement pre- and post-padding for the first radio transmission technique.

[0024] In an exemplary implementation of the communication device, an extended N SD_ShortThe table shows the N for dual carrier modulation DCM switch on and / or DCM switch off. SD_Short Defines the number of values.

[0025] This provides the advantage that dual carrier modulation can be supported by the new scheme.

[0026] In an exemplary implementation of the communication device, an extended N SD_Short The table includes one or more of the following combinations of RU values: 52+26, 106+26, 484+242, 996+484, 242+484+996, 484+2x996, 3x996, 484+3x996, 4x996.

[0027] This provides the advantage that multiple combinations of resource unit values ​​can be supported by the new scheme.

[0028] In an exemplary implementation of a communication device, with an RU size of 52+26, N SD_Short The value of is 18 for DCM=0 and 8 for DCM=1, and for an RU size of 106+26, N SD_Short The value of is 30 for DCM=0 and 14 for DCM=1, and for an RU size of 484+242, N SD_Short The value of is 180 or 174 for DCM=0, 90 for DCM=1, and N SD_Short The value of is 360 for DCM=0 and 180 for DCM=1, and for an RU size of 242+484+996, N SD_Short The value of is 420 for DCM=0 and 210 for DCM=1, and for an RU size of 484+2×996, N SD_Short The value of is 600, 606, or 612 for DCM=0, and 300 or 306 for DCM=1, and for an RU size of 3 × 996, N SD_Short The value of is 720, 726, or 738 for DCM=0, and 360 or 366 for DCM=1, and for an RU size of 484+3×996, N SD_ShortThe value of is 840, 846, or 852 for DCM=0, and 420 or 426 for DCM=1, and for an RU size of 4 × 996, N SD_Short The values ​​of are 978, 984, or 990 for DCM=0, and 486 or 492 for DCM=1. This implementation corresponds to Table 2 shown below.

[0029] The possible combinations of RUs are given in the following example: SD_Short So, exactly N SD_Short (242)+N SD_Short (484), and N is 52+26 SD_Short So, exactly N SD_Short (52)+N SD_Short (26), where N is 106+26. SD_Short So, exactly N SD_Short (106)+N SD_Short (26) and N of 996+484 SD_Short So, exactly N SD_Short (996)+N SD_Short (484), and N is 242+484+996 SD_Short So, exactly N SD_Short (242)+N SD_Short (484)+N SD_Short (996), and N is 484+2×996 SD_Short So, exactly N SD_Short (484)+N SD_Short (996)+N SD_Short (996), and N is 3×996 SD_Short So, exactly N SD_Short (996)+N SD_Short (996)+N SD_Short (996), and N is 484+3×996 SD_Short So, exactly N SD_Short (484)+N SD_Short (996)+N SD_Short (996)+N SD_Short (996), and N is 4 × 996 SD_Short So, exactly N SD_Short (996)+N SD_Short (996)+N SD_Short (996)+N SD_Short (996).

[0030] In an exemplary implementation of the communication device, the communication device performs any 2×N modulation for the combination of RU value equal to 106+26, DCM switch on, single stream, and binary phase shift keying modulation at code rate 1 / 2. DBPS is also configured to add a single padding bit after

[0031] In an exemplary implementation of the communications device, an extended set of PE parameters is defined for at least one of an extended modulation format of 4K-QAM or greater, an extended number of spatial streams greater than eight, and an extended bandwidth of 240 MHz, 320 MHz or greater.

[0032] This provides the advantage that the communication device is suitable to be implemented with the new functions defined by the EHT WiFi standard.

[0033] In an exemplary implementation of the communications device, the extended set of PE parameters is based on an extension of the PHY Packet Extension PPE Threshold field defined for the second wireless transmission technology, where the PPE Threshold field is extended by extending the NSTS subfield size to at least 4 bits and the RU Index bitmask size to at least 6 bits.

[0034] This provides the advantage that the communication device is compliant with the new features defined in the IEEE 802.11be standard.

[0035] The NSTS is a subfield of the PPE Threshold field that defines the maximum number of space-time streams supported by a station.

[0036] In an exemplary implementation of the communications device, the extended set of PE parameters is based on an extension of a resource unit allocation index field defined for the second wireless transmission technology, where the extended resource unit allocation index field includes an extended resource unit allocation size of 3×996 and / or 4×996 or greater.

[0037] This provides the advantage that the communication device is compliant with the new features defined by the IEEE 802.11be standard.

[0038] In an exemplary implementation of the communications device, the extended set of PE parameters is based on an extension of a constellation index field defined for the second wireless transmission technology, where the extended constellation index field includes one or more extended constellations above 4096-QAM.

[0039] This provides the advantage that the communication device is compliant with new features defined by the IEEE 802.11be standard, including in particular the 4K-QAM constellation.

[0040] In an exemplary implementation of the communications device, the extended set of PE parameters is based on reusing the PHY packet extension PPE threshold field defined for the second radio transmission technology, where the PPE threshold field is defined for modulation formats up to 1K-QAM, a number of spatial streams up to 8, and a resource unit size up to 2x996.

[0041] In an exemplary implementation of the communications device, the extended set of PE parameters is based on reusing the PPE threshold field defined for the second wireless transmission technology and on using a single bit to indicate the use of a modulation scheme of 4K-QAM or indicating a constellation of 4096-QAM in the extended constellation index field without using a single bit.

[0042] This provides the advantage that the communication device is compliant with new features defined by the IEEE 802.11be standard, including in particular the 4K-QAM constellation.

[0043] Alternatively, the indication of the constellation by using a single bit is not used, i.e. 4K-QAM can be indicated in EHT (802.11be) without using any additional bits. The only change is therefore the additional value of 4096 in the constellation index table (see table 3 below). This option is backward compatible with HE (802.11ax), because the HE device will see the indication "6" as "NONE" anyway, since it does not know about 4K-QAM.

[0044] In an exemplary implementation of the communications device, the extended set of PE parameters is based on using a single bit to indicate the use of a 4K-QAM modulation scheme, including a 4096-QAM constellation in the extended constellation index field, and extending the PPE threshold field defined for the second radio transmission technology by extending the NSTS subfield size to at least 4 bits to support up to 16 spatial streams, or indicating a 4096-QAM constellation in the extended constellation index field without using a single bit.

[0045] This provides the advantage that the communication device is compliant with new features defined by the IEEE 802.11be standard, including in particular the 4K-QAM constellation and the number of spatial streams of 16. Alternatively, as mentioned above, the indication of the constellation by using a single bit is not used.

[0046] In an exemplary implementation of the communications device, the extended set of PE parameters is based on using a single bit to indicate the use of a 4K-QAM modulation scheme, including a 4096-QAM constellation in the extended constellation index field, and extending the PPE threshold field defined for the second radio transmission technology by extending the size of the resource unit index bit mask to at least 6 bits, or indicating a 4096-QAM constellation in the extended constellation index field without using a single bit.

[0047] This provides the advantage that the communication device is compliant with new features defined by the IEEE 802.11be standard, including in particular the 4K-QAM constellation, Alternatively, as mentioned above, the representation of the constellation by using a single bit is not used.

[0048] In an exemplary implementation of the communications device, the extended set of PE parameters is based on using a single bit to indicate the use of a 4K-QAM modulation scheme, including a 4096-QAM constellation in the extended constellation index field, and extending the PPE threshold field defined for the second radio transmission technology by extending the NSTS subfield size to at least 4 bits and the RU index bitmask size to at least 6 bits, or indicating the 4096-QAM constellation in the extended constellation index field without using a single bit.

[0049] This provides the advantage that the communication device is compliant with new features defined by the IEEE 802.11be standard, including in particular the 4K-QAM constellation, Alternatively, as mentioned above, the representation of the constellation by using a single bit is not used.

[0050] According to a second aspect, the present disclosure relates to a communications method including transmitting and / or receiving a data frame based on a set of pre- and post-forward error correction (FEC) parameters and a set of packet extension PE parameters, where the set of pre- and post-FEC parameters is based on an extension of the set of pre- and post-FEC parameters defined for a second radio transmission technology with respect to a size of resource unit (RU) supported by the first radio transmission technology, where the set of pre- and post-FEC parameters is based on a combination of RUs supported by the first radio transmission technology, and where the set of PE parameters is based on an extension of the set of PE parameters defined for the second radio transmission technology with respect to a constellation size, a number of total space-time streams, and a resource unit (RU) allocation size supported by the first radio transmission technology.

[0051] By transmitting / receiving data frames based on such new definitions of pre- and post-FEC parameters and PE parameters, the use of such communication methods improves the performance of wireless transmission in advanced communication methods, e.g., EHT WiFi according to IEEE 802.11be. This new definition of packet extension and pre- and post-forward error correction padding is compliant with new wireless transmission standards, e.g., EHT WiFi, according to IEEE 802.11be.

[0052] According to a third aspect, the present disclosure relates to a computer program product comprising computer executable code or computer executable instructions which, when executed, cause at least one computer to perform the method according to the second aspect. Such a computer program product may comprise a non-transitory readable storage medium storing program code on the medium for use by a processor, the program code comprising instructions for implementing the method or computer blocks as described below.

[0053] Use of such a computer program product improves the performance of wireless transmissions in advanced communication systems such as EHT WiFi according to IEEE 802.11be. [Brief description of the drawings]

[0054] Further embodiments of the present invention are described with respect to the following figures. [Figure 1] 1 is a schematic diagram illustrating a communication device 100 according to the present disclosure. [Diagram 2] FIG. 1 is a schematic diagram illustrating post-FEC and PE in IEEE 802.11ax. [Figure 3a] FIG. 1 is a schematic diagram illustrating a PPE threshold field in IEEE 802.11ax; [Figure 3b] FIG. 1 is a schematic diagram illustrating the PPE threshold information field of IEEE 802.11ax; [Figure 4] FIG. 1 is a diagram illustrating a guideline for determining a packet extension padding period in IEEE 802.11ax. [Diagram 5] 1 is a schematic diagram illustrating a PPE Threshold field format together with a PPE Threshold Info field format according to the present disclosure. [Figure 6a] FIG. 1 is a schematic diagram illustrating 4K-QAM additional capability bits according to the present disclosure. [Figure 6b] FIG. 1 is a schematic diagram illustrating 4K-QAM additional capability bits according to the present disclosure. [Figure 7a] 1 is a schematic diagram illustrating a PPE threshold field format supporting 4K-QAM and more than eight spatial streams in accordance with the present disclosure. [Figure 7b] 1 is a schematic diagram illustrating a PPE threshold information field format supporting 4K-QAM and more than eight spatial streams in accordance with the present disclosure. [Figure 8a]1 is a schematic diagram illustrating a PPE threshold field format supporting 4K-QAM and additional RUs in accordance with the present disclosure. [Figure 8b] A schematic diagram illustrating a PPE threshold information field format supporting 4K-QAM and additional RUs in accordance with the present disclosure. [Figure 9a] FIG. 1 is a schematic diagram illustrating a PPE threshold field format supporting 4K-QAM, additional RUs, and more than eight spatial streams in accordance with the present disclosure. [Figure 9b] A schematic diagram illustrating a PPE threshold information field format supporting 4K-QAM and additional RUs and more than eight spatial streams in accordance with the present disclosure. [Figure 10] 1 is a schematic diagram of a communication method 1000 according to the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0055] In the following detailed description, reference is made to the accompanying drawings, which form a part of the description, and which show, by way of example, specific embodiments in which the present disclosure may be practiced. It is to be understood that other embodiments may be utilized, and that structural or logical changes may be made without departing from the scope of the present disclosure. Therefore, the following detailed description is not to be taken in a limiting sense, and the scope of the present disclosure is defined by the appended claims.

[0056] It should be understood that comments made in connection with a described method also apply to a corresponding device or system configured to perform the method, and vice versa. For example, where certain method steps are described, a corresponding device may include units that perform the described method steps, even if such units are not explicitly described or illustrated in the figures. Furthermore, it should be understood that features of the various exemplary aspects described herein may be combined with each other, unless otherwise specified.

[0057] The methods, devices and systems described herein may be implemented in wireless communication schemes, particularly in WiFi communication standards according to IEEE 802.11, particularly the 802.11n / ac / ax / be amendments. The described devices may include integrated circuits and / or passive circuits and may be manufactured by various technologies. For example, the circuits may be designed as logic integrated circuits, analog integrated circuits, mixed signal integrated circuits, optical circuits, memory circuits and / or integrated passive circuits.

[0058] The devices described herein may be configured to transmit and / or receive wireless signals. The wireless signals may be or include radio frequency signals emitted by a wireless transmitting device (or a wireless transmitter or transmitter). However, the devices described herein are not limited to transmitting and / or receiving wireless signals, and other signals designed for transmission in a deterministic communication network may be transmitted and / or received.

[0059] The devices and systems described herein may include a processor or processing device, a memory, and a transceiver, i.e., a transmitter and / or a receiver. The term "processor" or "processing device" refers to any device that can be utilized to process a particular task (or block or step). A processor or processing device may be a single processor or a multi-core processor, or may include a set of processors, or may include a means for processing. A processor or processing device may process software or firmware or applications, etc.

[0060] A communication device is described below. The new mechanisms are described with a focus on WiFi technology, specifically IEEE 802.11ax and IEEE 802.11be, but the new mechanisms may be applied to any new wireless transmission scheme where data fields are updated to support new standards. It should be understood that the new mechanisms described below are not limited to WiFi wireless transmission.

[0061] FIG. 1 shows a schematic diagram 100 illustrating a communication device 100 according to the present disclosure. Such a communication device 100 is configured to perform OFDM transmission (and / or reception). An example of an OFDM transmission chain for the last data symbol to be transmitted is shown in FIG. 1. Excess information bits 107 are provided to a pre-FEC padding block 108, which applies pre-FEC padding bits to the excess information bits 107 according to the pre-FEC padding. The resulting data 101 is applied to forward error correction (FEC) 102, post-FEC padding 103, OFDM modulation 104 and packet enhancement (PE) 105 to obtain the last data symbol 106 for transmission. It should be noted that in FIG. 1, only the last data symbol to be transmitted is illustrated. The pre / post-FEC and PE illustrated in FIG. 1 relate only to the last symbol. Analog blocks are used in the receiver to perform reception of the data symbol 106 transmitted over a wireless channel.

[0062] In this disclosure, new mechanisms are described to extend the pre- and post-FEC padding 103 and PE 105 to new requirements of new wireless transmission standards, such as 240 MHz / 320 MHz bandwidth, multi-RU and 4K-QAM introduced in IEEE 802.11bc for WiFi transmission.

[0063] The communications device 100 is configured to transmit and / or receive data frames based on a set of pre- and post-forward error correction FEC parameters and a set of packet extension PE parameters, the set of pre- and post-FEC parameters being based on an extension of the set of pre- and post-FEC parameters defined for a second radio transmission technology with respect to a size of resource units (RUs) supported by the first radio transmission technology, the set of pre- and post-FEC parameters being based on a combination of RUs supported by the first radio transmission technology, and the set of PE parameters being based on an extension of the set of PE parameters defined for the second radio transmission technology with respect to a constellation size, a number of total space-time streams, and a resource unit (RU) allocation size supported by the first radio transmission technology.

[0064] The first and second wireless transmission technologies may be WiFi technologies, the second wireless transmission technology may be an existing WiFi technology, and the first wireless technology may be a new WiFi technology, e.g., a new WiFi technology having a larger bandwidth, multiple resource units, and / or a higher constellation scheme. For example, the first wireless transmission technology may be 802.11be WiFi, and the second wireless transmission technology may be 802.11ax WiFi.

[0065] The first and second wireless transmission technologies may be the same (having different settings) or different (having different capabilities).

[0066] A number of RUs defined by the new first radio transmission technology are formed from a combination of two or more RUs defined by the older second radio transmission technology.

[0067] The communications device 100 may be configured to determine where in the data frame the post-padding begins based on a set of pre- and post-FEC parameters, the set of pre- and post-FEC parameters being an extension N SD_Short An integer number N of data subcarriers for the last symbol of a data frame, defined by the table SD_Short And the extension N SD_Short The table is based on the N SD_Short N defined by the second radio transmission technology with respect to additional values ​​of SD_Short An extension of the table, N SD_Short and an integer number of coded bits per symbol, N, for the last symbol of the data frame. CBPS_Short And N CBPS_Short is N SD_Short Depends on N CBPS_Short and an integer number of data bits per symbol, N, for the last symbol of the data frame. DBPS_Short And N DBPS_Short is N CBPS_Short Depends on N DBPS_Short It is based on.

[0068] A set of pre- and post-FEC parameters is defined for a second wireless transmission technology with respect to a combination of RU values ​​supported by the first wireless transmission technology, SD_Short Based on the expansion of the table, this N SD_Short The table is a predefined number of N SD_Short Values ​​include (see Table 2 shown below for Example #1 described below with respect to Figures 5-9).

[0069] Extension N SD_Short The table shows the N for dual carrier modulation DCM switch on and / or DCM switch off. SD_Short A number of values ​​may be defined (see Table 2 shown below for Example #1 described below with respect to Figures 5-9).

[0070] Extension N SD_ShortThe table may include one or more of the following combinations of RU values: 52+26, 106+26, 484+242, 996+484, 242+484+996, 484+2×996, 3×996, 484+3×996, 4×996 (see Table 2 shown below for Example #1 described below with respect to Figures 5 through 9).

[0071] For example, N for a combination of a first RU and a second RU supported by a first radio transmission technology SD_Short The value of is the N SD_Short The value of and N for the second RU SD_Short and the first RU and the second RU are supported by a second radio transmission technology.

[0072] Possible combinations of RUs are exemplarily described below. For example, N of 484+242 SD_Short So, exactly N SD_Short (242)+N SD_Short (484), and N is 52+26 SD_Short So, exactly N SD_Short (52)+N SD_Short (26), where N is 106+26. SD_Short So, exactly N SD_Short (106)+N SD_Short (26) and N of 996+484 SD_Short So, exactly N SD_Short (996)+N SD_Short (484), and N is 242+484+996 SD_Short So, exactly N SD_Short (242)+N SD_Short (484)+N SD_Short (996), and N is 484+2×996 SD_Short So, exactly N SD_Short (484)+N SD_Short (996)+N SD_Short (996), and N is 3×996 SD_Short So, exactly N SD_Short (996)+N SD_Short (996)+N SD_Short (996) and N of 484 + 3 × 996 SD_ShortSo, exactly N SD_Short (484)+N SD_Short (996)+N SD_Short (996)+N SD_Short (996), and N is 4 × 996 SD_Short So, exactly N SD_Short (996)+N SD_Short (996)+N SD_Short (996)+N SD_Short (996).

[0073] The communication device 100 performs any 2×N modulation for the combination of RU value equal to 106+26, DCM switched on, single stream, and binary phase shift keying modulation at code rate 1 / 2. DBPS may also be configured to add a single padding bit after (see Example #2 below with respect to Figures 5 to 9).

[0074] The pre-post FEC parameters are also called "pre-post FEC padding parameters" because these are the padding bits for the last symbol of a data frame. In pre-post FEC padding, 1 / 4 portions of the last OFDM symbol (i.e., 1 / 4, 1 / 2, 3 / 4) are padded after encoding and these portions do not need to be decoded.

[0075] An extended set of PE parameters may be defined for at least one of an extended modulation format of 4K-QAM or greater, an extended number of spatial streams greater than eight, and an extended bandwidth of 240 MHz, 320 MHz or greater (see Example #3 described below with respect to Figures 5 to 9).

[0076] The extended set of PE parameters may be based on an extension of the PHY Packet Extension PPE Threshold field defined for the second wireless transmission technology, where the PPE Threshold field is extended by extending the NSTS subfield size to at least 4 bits and the RU Index bitmask size to at least 6 bits (see Example #3 described below with respect to Figures 5 to 9).

[0077] The NSTS is a subfield of the PPE Threshold field that defines the maximum number of space-time streams supported by a station.

[0078] The extended set of PE parameters may be based on an extension of the resource unit allocation index field defined for the second radio transmission technology, which includes an extended resource unit allocation size of 3×996 and / or 4×996 or more (see Example #3a described below with respect to Figures 5 to 9).

[0079] The extended set of PE parameters is based on an extension of the constellation index field defined for the second wireless transmission technology, which includes one or more extended constellations of 4096-QAM and above (see Example #3a described below with respect to Figures 5 to 9).

[0080] The extended set of PE parameters may be based on reusing the PHY packet extension PPE threshold field defined for the second radio transmission technology, which is defined for modulation formats up to 1K-QAM, a number of spatial streams up to 8, and a resource unit size up to 2x996 (see Example #3b described below with respect to Figures 5 to 9).

[0081] The expanded set of PE parameters may be based on reusing the PPE threshold field defined for the second radio transmission technology and may also be based on using a single bit to indicate the use of a 4K-QAM modulation scheme (see Example #3c described below with respect to Figures 5 to 9).

[0082] The extended set of PE parameters may be based on using a single bit to indicate the use of a 4K-QAM modulation scheme, including a 4096-QAM constellation in the extended constellation index field, and extending the PPE threshold field defined for the second radio transmission technology by extending the NSTS subfield size to at least 4 bits to support up to 16 spatial streams (see example #3d described below with respect to Figures 5 to 9).

[0083] The extended set of PE parameters may be based on using a single bit to indicate the use of a 4K-QAM modulation scheme, including a 4096-QAM constellation in the extended constellation index field, and extending the PPE threshold field defined for the second radio transmission technology by extending the size of the resource unit index bit mask to at least 6 bits (see Example #3e described below with respect to Figures 5 to 9).

[0084] The extended set of PE parameters may be based on using a single bit to indicate the use of a 4K-QAM modulation scheme, including a 4096-QAM constellation in the extended constellation index field, and extending the PPE threshold field defined for the second radio transmission technology by extending the NSTS subfield size to at least 4 bits and the RU index bitmask size to at least 6 bits (see Example #3f described below with respect to Figures 5 to 9).

[0085] FIG. 2 shows a schematic diagram illustrating post-FEC and PE in IEEE 802.11ax.

[0086] To ease the processing requirements by 4× symbol period, some padding that does not contain any information is inserted at the end of the packet to allow for a Short Interframe Space (SIFS) time to respond. This padding artificially increases the packet to allow the receiver to complete the decoding process. In 802.11ax, Packet Extension (PE) and Pre-Post FEC padding were introduced. These two mechanisms considered the maximum combination of number of spatial streams (8), RU size (2×996) and QAM modulation (1K). Since 802.11be seeks to support larger values, i.e., 16 spatial streams, 4×996 and 4K-QAM, the definition, signaling and usage of PE and Pre-Post FEC padding need to be modified as presented in this disclosure.

[0087] In the current 802.11ax standard (IEEE P802.11ax™ / D6.1), there are four resource unit (RU) sizes, which are related to packet expansion: 242, 484, 996, and 2×996. In addition, up to eight spatial streams are supported, and the maximum supported modulation is 1K-QAM. Therefore, theoretically, a receiver may need to process a PPDU (Physical Protocol Data Unit) containing eight spatial streams with 1K-QAM modulation at over 160 MHz (RU=2×996). In this case, the processing may be laborious and require some extra time and / or extra HW to complete.

[0088] To ease the processing requirements at 4× symbol period, taking into account the SIFS time to respond, 802.11ax introduced Packet Extension (PE) and Pre-Post FEC padding.

[0089] In Fig. 2, four scenarios 210, 220, 230, 240 are shown with different lengths of the padding bits of the last OFDM symbol of the packet (left side of Fig. 2) and the packet extension segment that may follow the last OFDM symbol (right side of Fig. 2). In all scenarios, the index of the last OFDM symbol is N SYM So that the packets are N SYM Assume that the last OFDM symbol consists of a first OFDM symbol 210. In a first scenario 210, the number of FEC output bits 211 in the last OFDM symbol occupies 1 / 4 of the symbol, which is small compared to the number of post-FEC padding bits 212, which occupy 3 / 4 of the symbol. After OFDM modulation 201, a data field 213 in the last OFDM symbol is provided such that no packet extension is required and therefore not applied.

[0090] In the second scenario 220, the number of FEC output bits 221 in the last OFDM symbol occupies 1 / 2 of a symbol and is approximately the same length as the number of post-FEC padding bits 222, which also occupy 1 / 2 of a symbol. After OFDM modulation 201, a data field 223 in the last OFDM symbol is provided such that packet extension is not yet required and therefore not applied.

[0091] In a third scenario 230, the number of FEC output bits 231 in the last OFDM symbol occupies 3 / 4 of the symbol, which is longer than the number of post-FEC padding bits 232, which occupy 1 / 4 of the symbol. After OFDM modulation 201, a data field 233 in the last OFDM symbol is provided, and a packet extension PE 234 of 4 microseconds is required and appended to the data field 233 accordingly.

[0092] In a fourth scenario 240, the number of FEC output bits 241 in the last OFDM symbol occupies the entire symbol and is therefore provided without post-FEC padding bits. After OFDM modulation 201, a data field 243 in the last OFDM symbol is provided and an 8 microsecond packet extension PE 244 is required and therefore appended to the data field 243.

[0093] In pre-post FEC padding, quarter portions of the last OFDM symbol (i.e., 1 / 4, 1 / 2, 3 / 4) are padded after encoding and these portions do not need to be decoded.

[0094] Figure 2 shows the post-FEC and PE defined in 802.11ax for 8μsec (microsecond) nominal packet padding.

[0095] There are several parameters defined in the 802.11ax specification that are used to determine where the (post-FEC) padding starts.

[0096] Parameter N, which is explicitly defined in the 802.11ax specification and shown in Table 1 below SD_Short defines the number of tones used in the last OFDM symbol, which is always approximately 1 / 4 of the number of tones, and the rest of the tones in the last symbol are used as post-FEC. The parameter N CBPS_Short is N SD_Short It depends on the parameter N DBPS_Short is N CBPS_Short Note that not all RU sizes are integer multiples of 4. SD_Short The value of is also CBPS_Short , N DBPS_Short , and N DBPS_Short / N ES was also chosen to be an integer.

[0097] Table 1 below shows the parameter N depending on the RU size and whether the DCM (Dual Carrier Modulation) is switched on (DCM=1) or off (DCM=0). SD_Short Indicates the value of.

[0098] [Table 1]

[0099] DCM (Dual Carrier Modulation) is a technique supported by IEEE802.11ax where the same bit is transmitted twice (as two modulations QAM on two tones that are relatively far from each other) to increase diversity. This means that the effective coding rate is halved compared to not using DCM. The number of information data bits per symbol (N DBPS ) is the corresponding number of coded data bits per symbol for DCM=0 (N CBPS There are two cases where the RU size is not exactly half of the OFDM symbol size (these are MCS 0 with RU size of 106 tones, and MCS 0 with RU size of 242 tones). Therefore, the 802.11ax specification mandates that for these two cases, an additional padding bit is added to every OFDM symbol, and that this bit can be set to 0 or 1.

[0100] FIG. 3a shows a schematic diagram illustrating a PPE threshold field 310 in IEEE 802.11ax.

[0101] The PPE threshold field 310 includes a 3-bit NSTS field 311 indicating the number of stations, a 4-bit RU index bitmask 312, a variable-sized PPE threshold information field 320, and a PPE pad field 314 of size 0 to 7 bits.

[0102] The packet expansion threshold may be defined as follows:

[0103] A station (STA) sets its requested nominal packet extension to N STS , for each combination of RU size and modulation. The STA reports the PPE threshold field 310 as shown in FIG. 2, where: - N STS 311 is the maximum number of STSs defined in the report.

[0104] - RU index 312 defines the RU size, including the thresholds as shown in Table 9-321e of IEEE 802.11ax (see below).

[0105] [Table 2]

[0106] The PPE threshold is RU and N STS For each combination, we define 2×3 bits, where each 3 bits corresponds to a modulation, as shown in FIG. 3b.

[0107] STAs receiving this frame compare the values ​​of PPET8 and PPET16 and determine the nominal packet padding for each combination.

[0108] After receiving the PPE threshold field from the second STA, the first STA sets the PPE threshold field to PPE8 N STSn RUb subfield values ​​and PPET16 N STSn RU b The combination of subfield values ​​is used to define a nominal packet padding for the HE PPDU transmitted to the second STA as N STS=n and the RU allocation corresponding to RU allocation index b, N STSand RU values ​​(see Figure 4). The nominal packet padding is used when calculating the PE field duration (see 27.3.13 (Packet Extensions) of the 802.11ax specification).

[0109] 3b shows a schematic diagram illustrating an IEEE 802.11ax PPE threshold information field 320. The PPE threshold information field 320 includes a 3-bit PPET16 NSTS1 RUx field 321, a 3-bit PPET8 NSTS1 RUx field 322, a further bit field, a 3-bit PPET16 NSTS1 RUm field 323, a PPET8 NSTS1 RUm field 324, a further bit field, a 3-bit PPET16 NSTSn RUm field 325, and a 3-bit PPET8 NSTSn RUm field 326.

[0110] Figure 4 shows a guideline 400 for determining a packet extension padding period in IEEE 802.11ax. Figure 4 shows how a transmitting STA determines which PE is requested by a receiving STA based on threshold field information.

[0111] However, the above procedure is limited to the number of spatial streams, bandwidth and maximum modulation defined in IEEE802.11ax. The new WiFi standard IEEE802.11be supports the following advanced features: 240MHz / 320MHz, multi-RU (e.g. RU242+RU484 are integrated into the new RU with new size), 4K-QAM, and 16 spatial streams. The current WiFi standard IEEE802.11ax does not have a solution for these cases, and therefore it cannot be used as is in the new WiFi standard IEEE802.11be.

[0112] In the following, appropriate pre-post FEC and packet extension mechanisms are introduced to support the new WiFi standard IEEE 802.11be. These mechanisms according to the present disclosure are suitable for the new features being added to the new standard IEEE 802.11be. Figures 5 to 9 illustrate new frame formats for using these new pre-post FEC and packet extension mechanisms.

[0113] In particular, Figure 5 illustrates a new PPE threshold field format 510 along with a new PPE threshold information field format 520. The PPE threshold field format 510 includes a 4-bit N STS 511, a 6-bit RU index bitmask 512, a variable PPE threshold information field 520, and a 0 to 7-bit PPE pad field 514. The PPE threshold information field 520 is a 3-bit PPE STS1 RU x Field 521, 3-bit PPET8 N STS1 RU x Field 522, further field, 3-bit PPET16 N STS1 RU m Field 523, 3-bit PPET8 N STS1 RU m Field 524, further field, 3-bit PPET16 N STSn RU m Field 525, and 3-bit PPET8 N STSn RU m Includes field 526.

[0114] Figure 6a shows a new frame format 610 including the 4K-QAM additional feature bit. The new frame format 610 includes a 1-bit 4K-QAM delta field 611, and a 7-bit PPE pad field 612. Figure 6b shows a new frame format 620 including the 4K-QAM additional feature bit. The new frame format 620 includes a variable bit size 4K-QAM delta field 621, and a 0 to 7-bit PPE pad field 622.

[0115] 7a shows a new PPE threshold field format 710 that supports 4K-QAM and more than eight spatial streams. The PPE threshold field format 710 includes a 1-bit 4K-QAM delta field 711, a 4-bit N STS 712 , a 4-bit RU index bitmask 713 , a variable bit size PPE threshold information field 720 and a 0 to 7 bit PPE pad field 715 .

[0116] FIG. 7b shows a new PPE threshold information field format 720 that supports 4K-QAM and more than eight spatial streams. The PPE threshold information field 720 is a 3-bit PPE threshold information field that STS1 RU x Field 721, 3-bit PPET8 N STS1 RU x Field 722, further field, 3-bit PPET16 N STS1 RU m Field 723, 3-bit PPET8 N STS1 RU m Field 724, further field, 3-bit PPET16 N STSn RU m Field 725, and the 3-bit PPET8 N STSn RU m Includes field 726.

[0117] 8a shows a new PPE threshold field format 810 that supports 4K-QAM and additional RUs. The PPE threshold field format 810 includes a 1-bit 4K-QAM delta field 811, a 3-bit N STS 812 , a 6-bit RU index bitmask 813 , a variable bit size PPE threshold information field 820 and a 0 to 7 bit PPE pad field 815 .

[0118] FIG. 8b shows a new PPE threshold information field format 820 that supports 4K-QAM and additional RUs. The PPE threshold information field 820 is a 3-bit PPE threshold information field. STS1 RU x Field 821, 3 bits PPET8 N STS1 RU x Field 822, further field, 3-bit PPET16 N STS1 RUm field 823, 3-bit PPET8 N STS1 RU m Field 824, further field, 3-bit PPET16 N STSn RU m Field 825, and the 3-bit PPET8 N STSn RU m Includes field 826.

[0119] 9a shows a new PPE threshold field format 910 that supports 4K-QAM, additional NRUs, and more than eight spatial streams. The PPE threshold field format 910 includes a 1-bit 4K-QAM delta field 911, a 4-bit N STS 912 , a 6-bit RU index bitmask 913 , a variable bit size PPE threshold information field 820 , and a 0 to 7 bit PPE pad field 915 .

[0120] FIG. 9b shows a new PPE threshold information field format 920 that supports 4K-QAM and additional RUs and more than eight spatial streams. The PPE threshold information field 920 is a 3-bit PPE 16 N STS1 RU x Field 921, 3-bit PPET8 N STS1 RU x Field 922, further field, 3-bit PPET16 N STS1 RU m Field 923, 3-bit PPET8 N STS1 RU m Field 924, further field, 3-bit PPET16 NSTSn RU m Field 925, and the 3-bit PPET8 N STSn RU m Includes field 926.

[0121] In the following, the introduction of pre- and post-FEC and packet extension mechanisms to support IEEE 802.11be will be described with reference to FIGS.

[0122] 1. N corresponding to the new multi-RU size SD_Short Support is added for new values ​​of

[0123] a. The following lines (see Table 2) are SD_Short These values ​​are a linear combination of the respective existing 802.11ax RU values, since the aforementioned requirements are met.

[0124] b. The formula (right side of Table 2) is N SD_Short It defines how the value of is determined based on the 802.11ax value (for the 802.11ax defined RU).

[0125] [Table 3]

[0126] For the 2.106+26 example, the following parameters apply with DCM=1, single stream and MCS 0:

[0127] N CBPS =51+12=63 N DBPS =25+6=31 Therefore, as with the 106 and 242 tone RUs, in the 106+26MRU, 63=2×31+1, so a single padding bit (0 or 1) is added after every 2×NDBPS coded bit.

[0128] 3. Address the application of 4K-QAM, NSS>8 and 240 / 320MHz in the PPE threshold field in the following scenarios:

[0129] Full support within a.11be (only within EHT functionality, not relying on HE functionality).

[0130] I. Modify the PPE threshold field (including subfields) to accommodate 4K-QAM (see Table 3 below), 2x1992 tone RU size (see Table 4 below) and 16 streams (see Figure 5) as shown below.

[0131] II. Note: Multi-RU is not defined here, it is instead relied upon for larger RUs.

[0132] III. The new values ​​for IEEE 802.11ax are constellation index 6 for transmission constellation 4096-QAM in Table 3, RU allocation index 4 for RU allocation size 3×996 in Table 4, RU allocation index 5 for RU allocation size 4×996 in Table 5, and N STS field 511, and an RU index bitmask 512 having a 6-bit number.

[0133] [Table 4]

[0134] [Table 5]

[0135] b. For STAs that are HE compatible, i.e. supporting up to 8 spatial streams, BW up to 160 MHz and modulation up to 1K-QAM, the PPE threshold table from the HE capability is sufficient.

[0136] c. For STAs that are compatible with HE as in item b and additionally support 4K-QAM, two solutions can be applied so that they do not need to transmit "full" capabilities in HE and EHT, but only transmit HE capabilities and then additional capabilities ("delta") in EHT, which applies to all the following cases (including items "d", "e", etc.).

[0137] I. The Capability field 610 includes an additional bit 611, as shown in FIG. 6a, which indicates: i. If set to "1", N SS and N RU means that all cases where the combination gives PPET8="1K-QAM" and PPET16="NONE" should be converted to PPET16="4K-QAM", ii. If this bit is set to “0”, PPET16 remains “NONE”; iii. The new values ​​611 for IEEE 802.11ax are shown in Figure 6a.

[0138] II. The capability field 620 may be any of the following, as shown in FIG. 6b: SS and N RU , which includes an additional bit 621 for each combination of iv. If set to "1", N SS and N RU For each specific case where the combination of PPET8="1K-QAM" and PPET16="NONE" gives, it should be converted to PPET16="4K-QAM", v. If this bit 621 is set to "0", PPET16 remains "NONE", vi. Therefore, N SS ×N RU The sum of the bits is added.

[0139] vii. The new values ​​621 for IEEE 802.11ax are shown in Figure 6b.

[0140] III. As an alternative (or further option or embodiment) to items I and II above, the capability field 610 in FIG. 6a and 620 in FIG. 6b do not include the additional bits 611, 621. In this option, 4K-QAM can be indicated in EHT (802.11be) without any additional bits 611, 621. Thus, the only change is the additional value of 4096 in Table 3 above. This option is backward compatible with HE (802.11ax). The reason is that the HE device will see the indication "6" as "NONE" anyway, since it does not know about 4K-QAM.

[0141] d. For STAs that can support 4K-QAM and more than eight spatial streams, the schemes shown in Figures 7a and 7b may be applied.

[0142] I. Transmit a single 4K-QAM delta bit as described above.

[0143] II. Undefined N SS and N RU For each combination, a PPET8 / 16 value needs to be defined.

[0144] III. The constellation index is modified exactly as in Table 3.

[0145] IV. Therefore, 1+(N SS -8)×N RU,11ax x6 bits are added.

[0146] V. The new values ​​711 for IEEE 802.11ax are shown in FIG. 7a.

[0147] For STAs that can support e.4K-QAM and additional RUs (respectively for 802.11ax), the schemes shown in Figures 8a and 8b may be applied.

[0148] I. Transmit a single 4K-QAM delta bit as described above.

[0149] II. Undefined N SS and N RU For each combination, a PPET8 / 16 value needs to be defined.

[0150] III. The constellation index is modified exactly as in Table 3.

[0151] IV. Therefore, 1+N SS ×(N RU,11be -N RU,11ax ) × 6 bits are added.

[0152] The new values ​​811 for V. IEEE 802.11ax are shown in Figure 8a.

[0153] For STAs that can support f.4K-QAM, additional RUs (respectively for 802.11ax) and more than eight spatial streams, the schemes shown in Figures 9a and 9b may be applied.

[0154] I. Transmit a single 4K-QAM delta bit as described above.

[0155] II. Undefined N SS and N RU For each combination, a PPET8 / 16 value needs to be defined.

[0156] III. The constellation index is modified exactly as in Table 3.

[0157] IV. Therefore, 1+[N SS ×(N RU,11be -N RU,11ax )+(N SS -8)×N RU,11ax ]×6 bits are added.

[0158] The new values ​​911 for V. IEEE 802.11ax are shown in Figure 9a.

[0159] With these modifications, a communications device 100 can be provided as described above with respect to FIG.

[0160] Such communications device 100 is configured to transmit and / or receive data frames based on a set of pre- and post-forward error correction FEC parameters and a set of packet extension PE parameters, the set of pre- and post-FEC parameters being based on an extension of the set of pre- and post-FEC parameters defined for a second radio transmission technology with respect to a size of resource units (RUs) supported by the first radio transmission technology, the set of pre- and post-FEC parameters being based on a combination of RUs supported by the first radio transmission technology, and the set of PE parameters being based on an extension of the set of PE parameters defined for the second radio transmission technology with respect to a constellation size, a number of total space-time streams, and a resource unit (RU) allocation size supported by the first radio transmission technology.

[0161] The communications device 100 may be configured to determine where in the data frame the post-padding begins based on a set of pre- and post-FEC parameters, the set of pre- and post-FEC parameters being an extension N SD_Short An integer number N of data subcarriers for the last symbol of a data frame, defined by the table SD_Short And the extension N SD_Short The table is based on the N SD_Short N defined by the second radio transmission technology with respect to additional values ​​of SD_Short An extension of the table, N SD_Short and an integer number of coded bits per symbol, N, for the last symbol of the data frame. CBPS_Short And N CBPS_Short is N SD_Short Depends on N CBPS_Short and an integer number of data bits per symbol, N, for the last symbol of the data frame. DBPS_Short And N DBPS_Short is NCBPS_Short Depends on N DBPS_Short It is based on.

[0162] The pre-post FEC parameters are also called "pre-post FEC padding parameters" because these are the padding bits for the last symbol of a data frame. In pre-post FEC padding, 1 / 4 portions of the last OFDM symbol (i.e., 1 / 4, 1 / 2, 3 / 4) are padded after encoding and these portions do not need to be decoded.

[0163] Various options apply to this set of pre- and post-FEC parameters, and to this set of PE parameters, as described below.

[0164] In the first option (Example #1), new rows are added as N as shown in Table 2 above. SD_Short These values ​​are a linear combination of the respective existing 802.11ax RU values, since the aforementioned requirements are met. This formula is SD_Short Defines how the value of is determined based on the 802.11ax value (for RUs defined in 11ax).

[0165] Extension N SD_Short The table (see Table 2) may include one or more of the following combinations of RU values: 52+26, 106+26, 484+242, 996+484, 242+484+996, 484+2x996, 3x996, 484+3x996, 4x996.

[0166] N for a combination of a first RU and a second RU supported by a first radio transmission technology SD_Short The value of is the N SD_Short The value of and N for the second RU SD_Short and the first RU and the second RU are supported by a second radio transmission technology.

[0167] For example, the possible combinations are: N = 484 + 242 SD_Short So, exactly N SD_Short (242)+N SD_Short (484), and N is 52+26 SD_Short So, exactly N SD_Short (52)+N SD_Short (26), where N is 106+26. SD_Short So, exactly N SD_Short (106)+N SD_Short (26) and N of 996+484 SD_Short So, exactly N SD_Short (996)+N SD_Short (484), and N is 242+484+996 SD_Short So, exactly N SD_Short (242)+N SD_Short (484)+N SD_Short (996), and N is 484+2×996 SD_Short So, exactly N SD_Short (484)+N SD_Short (996)+N SD_Short (996), and N is 3×996 SD_Short So, exactly N SD_Short (996)+N SD_Short (996)+N SD_Short (996), and N is 484+3×996 SD_Short So, exactly N SD_Short (484)+N SD_Short (996)+N SD_Short (996)+N SD_Short (996), and N is 4 × 996 SD_Short So, exactly N SD_Short (996)+N SD_Short (996)+N SD_Short (996)+N SD_Short (996).

[0168] In the second option (example #2), for the 106+26 case, with DCM=1, single stream and MCS 0, we have the following parameters:

[0169] N CBPS =51+12=63 N DBPS=25+6=31 Therefore, for the 106 and 242 tone RUs, as well as the 106+26MRU, 63=2×31+1, so for all 2×N DBPS After the encoding bits, a single padding bit (0 or 1) is added.

[0170] The communication device 100 performs any 2×N modulation for the combination of RU value equal to 106+26, DCM switched on, single stream, and binary phase shift keying modulation at code rate 1 / 2. DBPS It may also be configured to add a single padding bit after

[0171] The pre-post FEC parameters are also called "pre-post FEC padding parameters" because these are the padding bits for the last symbol of a data frame. In pre-post FEC padding, 1 / 4 portions of the last OFDM symbol (i.e., 1 / 4, 1 / 2, 3 / 4) are padded after encoding and these portions do not need to be decoded.

[0172] The third option (example #3) is 4K-QAM, N SS The >8 and 240 / 320MHz adaptations are addressed in the PPE threshold field, taking into account the following scenarios:

[0173] Full support in 11be (only in EHT features, no dependency on HE features) - as explained in example #3a.

[0174] Depending on the HE functionality, a distinction can then be made between the various cases shown in Table 5.

[0175] [Table 6]

[0176] In the communication device 100, an extended set of PE parameters may be defined for at least one of an extended modulation format of 4K-QAM or greater, an extended number of spatial streams greater than eight, and an extended bandwidth of 240 MHz, 320 MHz or greater.

[0177] The extended set of PE parameters may be based on an extension of the PHY Packet Extensions PPE Threshold field defined for the second wireless transmission technology, which may be extended by extending the NSTS subfield size to at least 4 bits and the RU Index bitmask size to at least 6 bits.

[0178] The NSTS is a subfield of the PPE Threshold field that defines the maximum number of space-time streams supported by a station.

[0179] In case 0 of the third option (Example #3a), full support within the EHT is provided. The procedure corresponds to Tables 3 and 4 shown above in conjunction with FIG. 5. That is, modify the PPE threshold field 510 (including subfields 511, 512, 520, 514) to accommodate 4K-QAM, 2×1992 tone RU size and 16 streams as shown in Tables 3 and 4. Note: Multi-RU is not defined here, it is instead relied upon for larger RUs.

[0180] In the communications device 100, the extended set of PE parameters may be based on an extension of a resource unit allocation index field defined for the second wireless transmission technology. The extended resource unit allocation index field may include an extended resource unit allocation size of 3×996 and / or 4×996 or greater.

[0181] The extended set of PE parameters may be based on an extension of a constellation index field defined for the second wireless transmission technology. The extended constellation index field may include one or more extended constellations for 4096-QAM or greater.

[0182] In the third option, case 1 (example #3b), for STAs supporting up to 8SS, 160MHz BW, 1K-QAM, the HE functionality is reused. Therefore, the PPE threshold table from the HE functionality is sufficient.

[0183] In the communications device 100, the extended set of PE parameters may be based on reusing a PHY packet extension PPE threshold field defined for the second wireless transmission technology. The PPE threshold field may be defined for modulation formats up to 1K-QAM, a number of spatial streams up to 8, and a resource unit size up to 2×996.

[0184] In case 2 of the third option (example #3c), the HE capabilities are sufficient to describe everything except 4K-QAM. The solution is to transmit a single bit 611 as shown in Figure 6a, which, when set to "1", means that all cases where the combination of NSTS and RU_index gives PPET8="1K-QAM" and PPET16="NONE" should be converted to PPET16="4K-QAM". If this bit is set to "0", PPET16 remains "NONE". Thus, one bit is added.

[0185] In the communication device 100, the expanded set of PE parameters may be based on reusing the PPE threshold field defined for the second wireless transmission technology and may be based on using a single bit 611 to indicate the use of a modulation scheme of 4K-QAM.

[0186] In the third option, case 3 (example #3d), the HE capabilities are sufficient to describe everything except 4K-QAM and more than 8 streams. In this case, as shown in Figures 7a and 7b, a single 4K-QAM delta bit is transmitted as described above (see case 2). SS and N RU For each combination of N, a PPET8 / 16 value needs to be defined. The constellation index is modified exactly as in example #3a. Therefore, 1+(N SS -8)×N RU,11ax x6 bits are added.

[0187] The PPE threshold field format 810 is illustrated in Figures 7a and 7b. In one example, the following parameters are applied: Nss=12, RU index bit mask 1110 (corresponding to supporting 20 MHz, 40 MHz and 80 MHz). In the example, the following extension period required for Nsts=9 is applied: for RU=20, PPET16 is requested when modulation is 1KQAM and PPET8 is requested with 64QAM; for RU=40, PPET16 is requested when modulation is 4KQAM and PPET8 is requested with 64QAM; for RU=80, PPET16 is never requested and PPET8 is requested with 256QAM. In this example, Table 3 shown above is applied and a new row for constellation index 6 and transmit constellation 4096-QAM is added as shown in Table 3.

[0188] In the communication device 100, the extended set of PE parameters may be based on using a single bit to indicate the use of a 4K-QAM modulation scheme, including a 4096-QAM constellation in the extended constellation index field, and extending the PPE threshold field defined for the second wireless transmission technology by extending the NSTS subfield size to at least 4 bits to support up to 16 spatial streams.

[0189] In case 4 of the third option (example #3e), the HE capabilities are sufficient to describe everything except 4K-QAM and an additional RU. In this case, as shown in Figures 8a and 8b, a single 4K-QAM delta bit 811 is transmitted as described above. N SS and N RU For each combination of 1+N, a PPET8 / 16 value needs to be defined. The constellation index is modified exactly as in example #3a. Therefore, 1+N SS ×(N RU,11be -N RU,11ax ) × 6 bits are added.

[0190] In one example, as shown in Figures 8a and 8b, the PPE threshold field 810 and the PPE threshold information field format 820 are as shown in Figures 8a and 8b. The following parameters are applied: Nss=4, RU index bitmask 000110 (corresponding to supporting 160 MHz and 240 MHz). It also applies that the maximum Nsts=4.

[0191] In the communication device 100, the extended set of PE parameters may be based on using a single bit to indicate the use of a 4K-QAM modulation scheme, including a 4096-QAM constellation in the extended constellation index field, and extending the PPE threshold field defined for the second wireless transmission technology by extending the size of the resource unit index bit mask to at least 6 bits.

[0192] In case 5 of the third option (example #3f), the HE capabilities are sufficient to describe everything except 4K-QAM, additional RUs, and more than 8 streams, so all combinations need to be accounted for. In this case, a single 4K-QAM delta bit is transmitted as described above, as shown in Figures 8a and 8b. N not defined SS and N RUFor each combination of N, a PPET8 / 16 value needs to be defined. The constellation index is modified exactly as in example #3a. Therefore, 1+[N SS ×(N RU,11be -N RU,11ax )+(N SS -8)×N RU,11ax ]×6 bits are added.

[0193] In the communication device 100, the extended set of PE parameters may be based on using a single bit to indicate the use of a 4K-QAM modulation scheme, including a 4096-QAM constellation in the extended constellation index field, and extending the PPE threshold field defined for the second wireless transmission technology by extending the NSTS subfield size to at least 4 bits and the RU index bitmask size to at least 6 bits.

[0194] FIG. 10 illustrates a schematic diagram of a communication method 1000 according to the present disclosure.

[0195] The communication method 1000 includes transmitting and / or receiving 1001 a data frame based on a set of pre- and post-forward error correction FEC parameters and a set of packet extension PE parameters, e.g., as described above with respect to Figures 1-9. The set of pre- and post-FEC parameters is based on an extension of the set of pre- and post-FEC parameters defined for a second radio transmission technology with respect to a resource unit (RU) size supported by the first radio transmission technology. The set of pre- and post-FEC parameters is based on a combination of RUs supported by the first radio transmission technology, and the set of PE parameters is based on an extension of the set of PE parameters defined for the second radio transmission technology with respect to a constellation size, a number of total space-time streams, and a resource unit (RU) allocation size supported by the first radio transmission technology.

[0196] The first and second wireless transmission technologies may be WiFi technologies, and the second wireless transmission technology may be an existing WiFi technology, but the first wireless technology may be a new WiFi technology, e.g., a new WiFi technology having a larger bandwidth, multiple resource units, and / or a higher constellation scheme. For example, the first wireless transmission technology may be IEEE 802.11be WiFi, and the second wireless transmission technology may be IEEE 802.11ax WiFi.

[0197] The first and second wireless transmission technologies may be the same (having different settings) or different (having different capabilities).

[0198] A number of RUs defined by the new first radio transmission technology are formed from a combination of two or more RUs defined by the older second radio transmission technology.

[0199] The present disclosure also relates to a computer program product comprising computer executable code or instructions that, when executed, cause at least one computer to perform the execution and computation steps described herein, in particular the methods and procedures described above. Such a computer program product may include a readable non-transitory storage medium having stored thereon program code for use by a computer. The program code may implement the processes and computer steps described herein, in particular the methods and procedures described above.

[0200] Although a particular feature or aspect of the present disclosure may be disclosed with respect to only one of several implementations, such feature or aspect may be combined with one or more other features or aspects of other implementations, as may be desirable and advantageous for any given or particular application. Moreover, to the extent that the terms "comprise," "have," "including," or other variants thereof are used in the detailed description or claims, such terms are inclusive, just like the term "comprise." Also, the terms "exemplary," "for example," and "for example" are provided merely as examples, not as best or optimal. The terms "coupled" and "connected" may be used with derivatives. It should be understood that these terms may be used to indicate that two elements cooperate or interact with each other, regardless of whether they are in direct physical or electrical contact or whether they are not in direct contact with each other.

[0201] While specific embodiments have been illustrated and described herein, those skilled in the art will recognize that various alternative and / or equivalent implementations may be substituted for the specific embodiments illustrated and described without departing from the scope of the present disclosure. This application is intended to cover any adaptations or variations of the specific embodiments discussed herein.

[0202] Although elements in the following claims are recited in a particular order with corresponding labeling, the elements are not necessarily limited to being implemented in that particular order, unless the claim recitation specifically implies a particular order for implementing some or all of those elements.

[0203] Many alternatives, modifications, and variations will be apparent to those skilled in the art in light of the above teachings. Of course, those skilled in the art will easily understand that there are many applications of the present invention beyond those described herein. Although the present invention has been described with reference to one or more specific embodiments, those skilled in the art will understand that many changes can be made thereto without departing from the scope of the present invention. Therefore, it should be understood that within the scope of the appended claims and their equivalents, the present invention may be practiced otherwise than as specifically described herein.

Claims

1. A communication device (100), configured to transmit and / or receive data frames based on a set of pre- and post-forward error correction (FEC) parameters and a set of packet extension (PE) parameters; the set of pre- and post-FEC parameters is based on an extension of a set of pre- and post-FEC parameters defined for a second wireless transmission technology with respect to a size of resource units (RU) supported by a first wireless transmission technology, the set of pre- and post-FEC parameters being based on a combination of RUs supported by the first wireless transmission technology; 4. A communications device (100) comprising: a first wireless transmission technology that transmits a first UE signal to a second wireless transmission technology; a second wireless transmission technology that transmits a first UE signal to a second wireless transmission technology;

2. and configured to determine where in the data frame post-padding begins based on the set of pre-post FEC parameters, the set of pre-post FEC parameters comprising: Extension N SD_Short an integer number N of data subcarriers for the last symbol of said data frame, defined by a table SD_Short The extension N SD_Short The table includes N SD_Short N defined by the second radio transmission technology for additional values ​​of SD_Short An extension of the table, N SD_Short and, An integer number N of coded bits per symbol for the last symbol of the data frame CBPS_Short Where N CBPS_Short is N SD_Short Depends on N CBPS_Short and, An integer number N of data bits per symbol for the last symbol of the data frame DBPS_Short Where N DBPS_Short is N CBPS_Short Depends on N DBPS_Short and The communication device (100) of claim 1, based on

3. The set of pre- and post-FEC parameters is defined for the second wireless transmission technology with respect to a combination of RU values ​​supported by the first wireless transmission technology. SD_Short It is based on the extension of the table, The N SD_Short The table is a predefined number of N SD_Short The communication device (100) of claim 1 or 2, comprising a value.

4. The extension N SD_Short The table shows N for dual carrier modulation DCM switch on and / or DCM switch off. SD_Short The communication device (100) of claim 3, wherein the communication device (100) defines a number of values.

5. For RU size of 52+26, N SD_Short The value of is 18 for DCM=0 and 8 for DCM=1, For RU size of 106+26, N SD_Short The value of is 30 for DCM=0 and 14 for DCM=1, For an RU size of 484+242, N SD_Short The value of is 180 or 174 for DCM=0, and 90 for DCM=1, For RU size of 996+484, N SD_Short The value of is 360 for DCM=0 and 180 for DCM=1, For RU size of 242+484+996, N SD_Short The value of is 420 for DCM=0 and 210 for DCM=1, For RU size of 484+2×996, N SD_Short The value of is 600, 606, or 612 for DCM=0, and 300 or 306 for DCM=1. For RU size of 3×996, N SD_Short The value of is 720, 726, or 738 for DCM=0, and 360 or 366 for DCM=1, For RU size of 484+3×996, N SD_Short The value of is 840, 846, or 852 for DCM=0, and 420 or 426 for DCM=1, For RU size of 4x996, N SD_Short The communication device (100) of any one of claims 1 to 4, wherein the value of is 978 or 984 or 990 for DCM=0 and is 486 or 492 for DCM=1.

6. For the combination of RU value equal to 106+26, DCM switched on, single stream, and binary phase shift keying modulation at code rate 1 / 2), DBPS 6. The communication device (100) of any one of claims 1 to 5, configured to add a single padding bit even after

7. The communication device (100) of any one of claims 1 to 6, wherein the extended set of PE parameters is defined for at least one of an extended modulation format of 4K-QAM or more, an extended number of spatial streams greater than eight, and an extended bandwidth of 240 MHz, 320 MHz or more.

8. the extended set of PE parameters is based on an extension of a PHY Packet Extension PPE Threshold field defined for the second wireless transmission technology; 8. The communication device (100) of claim 1, wherein the PPE threshold field is extended by extending the NSTS subfield size to at least 4 bits and the RU index bitmask size to at least 6 bits.

9. the extended set of PE parameters is based on an extension of a resource unit allocation index field defined for the second radio transmission technology; The communications device (100) of any one of claims 1 to 8, wherein the extended resource unit allocation index field comprises an extended resource unit allocation size of 3x996 and / or 4x996 or greater.

10. the extension set of PE parameters is based on an extension of a constellation index field defined for the second wireless transmission technology; The communications device (100) of any one of claims 1 to 9, wherein the extended constellation index field includes one or more extended constellations for 4096-QAM or higher.

11. the extended set of PE parameters is based on reusing a PHY packet extension PPE threshold field defined for the second wireless transmission technology; The communications device (100) of any one of claims 1 to 7, wherein the PPE threshold field is defined for modulation formats up to 1K-QAM, a number of spatial streams up to 8, and a resource unit size up to 2x996.

12. the extended set of PE parameters is based on reusing a PPE threshold field defined for the second wireless transmission technology; and The communication device (100) according to any one of claims 1 to 7, based on using a single bit to indicate the use of a modulation scheme of 4K-QAM or on indicating a constellation of 4096-QAM in an extended constellation index field without using said single bit.

13. The extended set of PE parameters includes: Use of a single bit to indicate the use of a 4K-QAM modulation scheme; Including a 4096-QAM constellation in an extended constellation index field; and extending a PPE threshold field defined for the second wireless transmission technology by extending the NSTS subfield size to at least 4 bits to support up to 16 spatial streams; or indicating a 4096-QAM constellation in the extended constellation index field without using the single bit; A communication device (100) according to any one of claims 1 to 7, based on

14. The extended set of PE parameters includes: Use of a single bit to indicate the use of a 4K-QAM modulation scheme; Including a 4096-QAM constellation in an extended constellation index field; and extending a PPE threshold field defined for the second radio transmission technology by extending a size of a resource unit index bitmask to at least 6 bits; or indicating a 4096-QAM constellation in the extended constellation index field without using the single bit; A communication device (100) according to any one of claims 1 to 7, based on

15. The extended set of PE parameters includes: Use of a single bit to indicate the use of a 4K-QAM modulation scheme; Including a 4096-QAM constellation in an extended constellation index field; and extending a PPE threshold field defined for the second wireless transmission technology by extending the NSTS subfield size to at least 4 bits and the RU index bitmask size to at least 6 bits; or indicating a 4096-QAM constellation in the extended constellation index field without using the single bit; A communication device (100) according to any one of claims 1 to 7, based on

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