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TECHNIQUES FOR PRE AND POST FORWARD ERROR CORRECTION AND PACKET PADDING IN RADIO TRANSMISSION

20230261784 · 2023-08-17

    Inventors

    Cpc classification

    International classification

    Abstract

    The present disclosure relates to techniques for forward error correction and packet padding in radio transmission, e.g. WiFi communication schemes such as IEEE 802.11ax and 802.11be. In particular, the disclosure relates to a communication device configured to: transmit and/or receive a data frame based on a set of pre&post-Forward Error Correction (pre&post-FEC) parameters and a set of packet extension (PE) parameters, wherein the set of pre&post-FEC parameters is based on an extension of a set of pre&post-FEC parameters defined for a second radio transmission technology with respect to a size of resource units (RUs) supported by a first radio transmission technology, wherein the set of pre&post-FEC parameters is based on a combination of RUs that is supported by the first radio transmission technology, and wherein the set of PE parameters is based on an extension of a set of PE parameters defined for the second radio transmission technology.

    Claims

    1. A communication device, comprising: a transceiver configured to transmit and/or receive a data frame based on a set of pre&post-Forward Error Correction (pre&post-FEC) parameters and a set of packet extension (PE) parameters; wherein the set of pre&post-FEC parameters is based on an extension of a set of pre&post-FEC parameters defined for a second radio transmission technology with respect to a size of resource units (RUs) supported by a first radio transmission technology, wherein the set of pre&post-FEC parameters is based on a combination of RUs that is supported by the first radio transmission technology; and wherein the set of PE parameters is based on an extension of a 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.

    2. The communication device of claim 1, further comprising: a processor configured to determine where a post-padding begins in the data frame based on the set of pre&post-FEC parameters, wherein the set of pre&post-FEC parameters is based on: an integer number of data subcarriers for a last symbol of the data frame (N.sub.SD-Short) as defined by an extended N.sub.SD_Short table, wherein the extended N.sub.SD_Short table is an extension of a N.sub.SD_Short table defined by the second radio transmission technology with respect to additional values of N.sub.SD_Short defined by the first radio transmission technology, an integer number of coded bits per symbol for the last symbol of the data frame (N.sub.CBPS_Short), wherein N.sub.CBPS_Short depends on N.sub.SD_Short, and an integer number of data bits per symbol for the last symbol of the data frame (N.sub.DBPS_Short), wherein N.sub.DBPS_Short depends on N.sub.CBPS_Short.

    3. The communication device of claim 2, wherein the set of pre&post-FEC parameters is based on an extension of an N.sub.SD_Short table defined for the second radio transmission technology with respect to combinations of RU values supported by the first radio transmission technology; and wherein the N.sub.SD_Short table comprises predefined numbers of N.sub.SD_Short values.

    4. The communication device of claim 3, wherein the extended N.sub.SD_Short table defines the numbers of N.sub.SD_Short values for a dual-carrier modulation (DCM) switched on and/or a DCM switched off.

    5. The communication device of claim 4, wherein: for an RU size of 52+26 a value of N.sub.SD_Short is 18 for DCM=0, and is 8 for DCM=1, for an RU size of 106+26 a value of N.sub.SD_.sub.Short is 30 for DCM=0, and is 14 for DCM=1, for an RU size of 484+242 a value of N.sub.SD_Short is 180 or 174 for DCM=0, and is 90 for DCM=1, for an RU size of 996+484 a value of N.sub.SD_Short is 360 for DCM=0, and is 180 for DCM=1, for an RU size of 242+484+996 a value of N.sub.SD_Short is 420 for DCM=0, and is 210 for DCM=1, for an RU size of 484+2×996 a value of N.sub.SD_.sub.Short is 600 or 606 or 612 for DCM=0, and is 300 or 306 for DCM=1, for an RU size of 3×996 a value of N.sub.SD_Short is 720 or 726 or 738 for DCM=0, and is 360 or 366 for DCM=1, for an RU size of 484+3×996 a value of N.sub.SD_.sub.Short is 840 or 846 or 852 for DCM=0, and is 420 or 426 for DCM=1, for an RU size of 4×996 a value of N.sub.SD_Short is 978 or 984 or 990 for DCM=0, and is 486 or 492 for DCM=1.

    6. The communication device of claim 5, wherein the processor is further configured to: add a single padding bit after every 2XN.sub.DBPS for the combination of RU values equal to 106 + 26, DCM switched-on, single stream and binary phase shift keying modulation with code-rate ½.

    7. The communication device of claim 1, wherein the extension of the set of PE parameters is defined for at least one of an extended modulation scheme of 4K-QAM or higher, an extended number of spatial streams greater than 8, or an extended bandwidth of 240 MHz or higher.

    8. The communication device of claim 1, wherein the extension of the set of PE parameters is based on an extension of a PHY packet extension (PPE) thresholds field defined for the second radio transmission technology; and wherein the PPE thresholds field is extended by extending a NSTS (number of spatial streams) subfield size to at least 4 bits and a RU index bitmask size to at least 6 bits.

    9. The communication device of claim 1, wherein the extension of the set of PE parameters is based on an extension of a resource unit allocation index field defined for the second radio transmission technology; and wherein the extension of the resource unit allocation index field comprises extended resource unit allocation sizes of 3×996 and/or 4×996 or higher.

    10. The communication device of claim 1, wherein the extension of the set of PE parameters is based on an extension of a constellation index field defined for the second radio transmission technology; and wherein the extension of the constellation index field comprises one or more extended constellations of 4096-QAM or higher.

    11. The communication device of claim 1, wherein the extension of the set of PE parameters is based on reusing a PHY packet extension (PPE) thresholds field defined for the second radio transmission technology; and wherein the PPE thresholds field is defined for modulation schemes less or equal than 1K-QAM, a number of spatial streams less or equal than 8, and resource unit sizes less or equal than 2×996.

    12. The communication device of claim 1, wherein the extension of the set of PE parameters is based on reusing a PHY packet extension (PPE) thresholds field defined for the second radio transmission technology and based on: using a single bit indicating use of a modulation scheme of 4K-QAM; or indicating a constellation of 4096-QAM in an extended constellation index field without using the single bit.

    13. The communication device of claim 1, wherein the extension of the set of PE parameters is based on: using a single bit indicating use of a modulation scheme of 4K-QAM, including a constellation of 4096-QAM in an extended constellation index field, and extending a PHY packet extension (PPE) thresholds field defined for the second radio transmission technology by extending a NSTS (number of spatial streams) subfield size to at least 4 bits in order to support up to 16 spatial streams; or indicating a constellation of 4096-QAM in the extended constellation index field without using the single bit.

    14. The communication device of claim 1, wherein the extended set of PE parameters is based on: using a single bit indicating use of a modulation scheme of 4K-QAM, including a constellation of 4096-QAM in an extended constellation index field, and extending a PHY packet extension (PPE) thresholds field defined for the second radio transmission technology by extending the size of a resource unit index bitmask to at least 6 bits; or indicating a constellation of 4096-QAM in the extended constellation index field without using the single bit.

    15. The communication device of claim 1, wherein the extended set of PE parameters is based on: using a single bit indicating use of a modulation scheme of 4K-QAM, including a constellation of 4096-QAM in an extended constellation index field, and extending a PHY packet extension (PPE) thresholds field defined for the second radio transmission technology by extending a NSTS (number of spatial streams) subfield size to at least 4 bits and a RU index bitmask size to at least 6 bits; or indicating a constellation of 4096-QAM in the extended constellation index field without using the single bit.

    16. A method, comprising: transmitting and/or receiving a data frame based on a set of pre&post-Forward Error Correction (pre&post-FEC) parameters and a set of packet extension (PE) parameters; wherein the set of pre&post-FEC parameters is based on an extension of a set of pre&post-FEC parameters defined for a second radio transmission technology with respect to a size of resource units (RUs) supported by a first radio transmission technology, wherein the set of pre&post-FEC parameters is based on a combination of RUs that is supported by the first radio transmission technology; and wherein the set of PE parameters is based on an extension of a 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.

    17. The method of claim 16, further comprising: determining where a post-padding begins in the data frame based on the set of pre&post-FEC parameters, wherein the set of pre&post-FEC parameters is based on: an integer number of data subcarriers for a last symbol of the data frame (N.sub.SD-Short) as defined by an extended N.sub.SD_Short table, wherein the extended N.sub.SD_Short table is an extension of a N.sub.SD_Short table defined by the second radio transmission technology with respect to additional values of N.sub.SD_Short defined by the first radio transmission technology, an integer number of coded bits per symbol for the last symbol of the data frame (N.sub.CBPS_Short), wherein N.sub.CBPS_Short depends on N.sub.SD_Short, and an integer number of data bits per symbol for the last symbol of the data frame (N.sub.DBPS_Short), wherein N.sub.DBPS_Short depends on N.sub.CBPS_Short.

    18. The method of claim 17, wherein the set of pre&post-FEC parameters is based on an extension of an N.sub.SD_Short table defined for the second radio transmission technology with respect to combinations of RU values supported by the first radio transmission technology; and wherein the N.sub.SD_Short table comprises predefined numbers of N.sub.SD_Short values.

    19. The method of claim 18, wherein the extended N.sub.SD_Short table defines the numbers of N.sub.SD_Short values for a dual-carrier modulation (DCM) switched on and/or a DCM switched off.

    20. The method of claim 19, wherein: for an RU size of 52+26 a value of N.sub.SD_Short is 18 for DCM=0, and is 8 for DCM=1, for an RU size of 106+26 a value of N.sub.SD_Short is 30 for DCM=0, and is 14 for DCM=1, for an RU size of 484+242 a value of N.sub.SD_Short is 180 or 174 for DCM=0, and is 90 for DCM=1, for an RU size of 996+484 a value of N.sub.SD_Short is 360 for DCM=0, and is 180 for DCM=1, for an RU size of 242+484+996 a value of N.sub.SD_Short is 420 for DCM=0, and is 210 for DCM=1, for an RU size of 484+2×996 a value of N.sub.SD_Short is 600 or 606 or 612 for DCM=0, and is 300 or 306 for DCM=1, for an RU size of 3×996 a value of N.sub.SD_Short is 720 or 726 or 738 for DCM=0, and is 360 or 366 for DCM=1, for an RU size of 484+3×996 a value of N.sub.SD_Short is 840 or 846 or 852 for DCM=0, and is 420 or 426 for DCM=1, for an RU size of 4×996 a value of N.sub.SD_Short is 978 or 984 or 990 for DCM=0, and is 486 or 492 for DCM=1.

    Description

    BRIEF DESCRIPTION OF THE DRAWINGS

    [0056] Further embodiments of the disclosure will be described with respect to the following figures, in which:

    [0057] FIG. 1 shows a schematic diagram 100 illustrating a communication device 100 according to the disclosure;

    [0058] FIG. 2 shows a schematic diagram illustrating Post-FEC and PE in IEEE 802.11ax;

    [0059] FIG. 3A shows a schematic diagram illustrating PPE Threshold field in IEEE 802.11ax;

    [0060] FIG. 3B shows a schematic diagram illustrating PPE Threshold Info field in IEEE 802.11ax;

    [0061] FIG. 4 shows guidelines for decision of packet extension padding duration in IEEE 802.11ax;

    [0062] FIG. 5 shows a schematic diagram illustrating PPE Thresholds field format together with a PPE Thresholds Info field format according to the disclosure;

    [0063] FIG. 6A shows a schematic diagram illustrating 4K-QAM additional capability bit according to the disclosure;

    [0064] FIG. 6B shows a schematic diagram illustrating 4K-QAM additional capability bits according to the disclosure;

    [0065] FIG. 7A shows a schematic diagram illustrating PPE Thresholds field format supporting 4K-QAM and more than 8 spatial streams according to the disclosure;

    [0066] FIG. 7B shows a schematic diagram illustrating PPE Thresholds Info field format supporting 4K-QAM and more than 8 spatial streams according to the disclosure;

    [0067] FIG. 8A shows a schematic diagram illustrating PPE Thresholds field format supporting 4K-QAM and additional RUs according to the disclosure;

    [0068] FIG. 8B shows a schematic diagram illustrating PPE Thresholds Info field format supporting 4K-QAM and additional RUs according to the disclosure;

    [0069] FIG. 9A shows a schematic diagram illustrating PPE Thresholds field format supporting 4K-QAM, additional RUs and more than 8 spatial streams according to the disclosure;

    [0070] FIG. 9B shows a schematic diagram illustrating PPE Thresholds Info field format supporting 4K-QAM and additional RUs and more than 8 spatial streams according to the disclosure; and

    [0071] FIG. 10 shows a schematic diagram of a communication method 1000 according to the disclosure.

    DETAILED DESCRIPTION OF EMBODIMENTS

    [0072] In the following detailed description, reference is made to the accompanying drawings, which form a part thereof, and in which is shown by way of illustration specific aspects in which the disclosure may be practiced. It is understood that other aspects may be utilized and structural or logical changes may be made without departing from the scope of the present disclosure. The following detailed description, therefore, is not to be taken in a limiting sense, and the scope of the present disclosure is defined by the appended claims.

    [0073] It is understood that comments made in connection with a described method may also hold true for a corresponding device or system configured to perform the method and vice versa. For example, if a specific method step is described, a corresponding device may include a unit to perform the described method step, even if such unit is not explicitly described or illustrated in the figures. Further, it is understood that the features of the various exemplary aspects described herein may be combined with each other, unless specifically noted otherwise.

    [0074] The methods, devices and systems described herein may be implemented in wireless communication schemes, in particular communication schemes according to WiFi communication standards according to IEEE 802.11, in particular 802.11n/ac/ax/be amendments. The described devices may include integrated circuits and/or passives and may be manufactured according to 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 passives.

    [0075] The devices described herein may be configured to transmit and/or receive radio signals. Radio signals may be or may include radio frequency signals radiated by a radio transmitting device (or radio transmitter or sender). However, devices described herein are not limited to transmit and/or receive radio signals, also other signals designed for transmission in deterministic communication networks may be transmitted and/or received.

    [0076] The devices and systems described herein may include processors or processing devices, memories and transceivers, i.e. transmitters and/or receivers. The term “processor” or “processing device” describes any device that can be utilized for processing specific tasks (or blocks or steps). A processor or processing device can be a single processor or a multi-core processor or can include a set of processors or can include means for processing. A processor or processing device can process software or firmware or applications etc.

    [0077] Communication devices are described in the following. Although, the new mechanisms are described with a focus on WiFi technologies, in particular IEEE 802.1 1ax and IEEE 802.11be, the new mechanisms may be applied to any new radio transmission schemes in which data fields are updated to support the new standard. It is understood that these new mechanisms described hereinafter are not limited to WiFi radio transmission.

    [0078] FIG. 1 shows a schematic diagram 100 illustrating a communication device 100 according to the disclosure. Such a communication device 100 is configured to perform OFDM transmission (and/or reception). An example of an OFDM transmission chain for a last data symbol to be transmitted is shown in FIG. 1. Excess Information bits 107 are provided to a Pre-FEC padding block 108 that applies Pre-FEC padding bits to the Excess Information bits 107 according to Pre-FEC padding. The resulting data 101 is applied to Forward Error Correction (FEC) 102, Post-FEC Padding 103, OFDM modulation 104 and Packet Extension (PE) 105 to provide the last data symbol 106 for transmission. Note that FIG. 1 only illustrates the last data symbol to be transmitted. Pre/post-FEC and PE as illustrated in FIG. 1 only relates to the last symbol. The analog blocks are used in the receiver to perform reception of data symbols 106 transmitted over radio channel.

    [0079] In this disclosure, new mechanisms to extend Pre&post-FEC Padding 103 and PE 105 to new requirements of novel radio transmission standards are described. For example, such requirements are 240 MHz/320 MHz bandwidth, multi-RUs and 4K-QAM as introduced in IEEE 802.11bc for WiFi transmission.

    [0080] The communication device 100 is configured to transmit and/or receive a data frame based on a set of pre&post-Forward Error Correction, FEC, parameters and a set of packet extension, PE, parameters. The set of pre&post-FEC parameters is based on an extension of a set of pre&post-FEC parameters defined for a second radio transmission technology with respect to a size of resource units, RUs, supported by a first radio transmission technology, wherein the set of pre&post-FEC parameters is based on a combination of RUs that is supported by the first radio transmission technology. The set of PE parameters is based on an extension of a 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.

    [0081] The first and second radio transmission technologies can be WiFi technologies, the second radio transmission technology can be an existing WiFi technology, while the first radio technology can be a new WiFi technology, e.g. a new WiFi technology having higher bandwidth, multi-resource units and/or higher constellation scheme. For example, the first radio transmission technology can be 802.11be WiFi and the second radio transmission technology can be 802.11ax WiFi.

    [0082] The first and second radio transmission technologies can be the same (with different settings) or different (with different capabilities).

    [0083] A multiple RU as defined by the new first radio transmission technology is formed from a combination of two or more RUs defined by the old second radio transmission technology.

    [0084] The communication device 100 may be configured to determine where a post-padding begins in the data frame based on the set of pre&post-FEC parameters, wherein the set of pre&post-FEC parameters is based on: an integer number of data subcarriers for a last symbol of the data frame, N.sub.SD_Short, as defined by an extended N.sub.SD_Short table, wherein the extended N.sub.SD_Short table is an extension of a N.sub.SD_Short table defined by the second radio transmission technology with respect to additional values of N.sub.SD_Short defined by the first radio transmission technology, an integer number of coded bits per symbol for the last symbol of the data frame, N.sub.CBPS_Short, wherein N.sub.CBPS_Short depends on N.sub.SD_Short, and an integer number of data bits per symbol for the last symbol of the data frame, N.sub.DBPS_Short, wherein N.sub.DBPS_Short depends on N.sub.CBPS_Short.

    [0085] The set of pre&post-FEC parameters may be based on an extension of an N.sub.SD_Short table defined for the second radio transmission technology with respect to combinations of RU values supported by the first radio transmission technology, wherein the N.sub.SD_Short table comprises predefined numbers of N.sub.SD_Short values (see Table 2 shown below with respect to Example #1 described below with respect to FIGS. 5 to 9).

    [0086] The extended N.sub.SD_Short table may define the numbers of N.sub.SD_Short values for a dual-carrier modulation, DCM, switched on and/or a DCM switched off (see Table 2 shown below with respect to Example #1 described below with respect to FIGS. 5 to 9).

    [0087] The extended N.sub.SD_Short 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 with respect to Example #1 described below with respect to FIGS. 5 to 9).

    [0088] For example, a value of N.sub.SD_Short for a combination of a first RU and a second RU that is supported by the first radio transmission technology may correspond to an addition of an N.sub.SD_Short value for the first RU and an N.sub.SD_Short value for the second RU, the first RU and the second RU being supported by the second radio transmission technology.

    [0089] Possible combinations of RUs are exemplarily described in the following: For example: N.sub.SD_Short for 484+242 is exactly N.sub.SD_Short (242)+ N.sub.SD_Short (484); N.sub.SD_Short for 52+26 is exactly N.sub.SD_Short (52)+ N.sub.SD_Short (26); N.sub.SD_Short for 106+26 is exactly N.sub.SD_Short (106)+ N.sub.SD_Short (26); N.sub.SD_Short for 996+484 is exactly N.sub.SD_Short (996)+ N.sub.SD_Short (484); N.sub.SD_Short for 242+484+996 is exactly N.sub.SD_Short (242)+ N.sub.SD_Short (484) + N.sub.SD_Short (996); N.sub.SD_Short for 484+2×996 is exactly N.sub.SD_Short (484)+ N.sub.SD_Short (996) + N.sub.SD_Short (996); N.sub.SD_Short for 3×996 is exactly N.sub.SD_Short (996)+ N.sub.SD_Short (996) + N.sub.SD_Short (996); N.sub.SD_Short for 484+3×996 is exactly N.sub.SD_Short (484)+ N.sub.SD_Short (996) + N.sub.SD_Short (996) + N.sub.SD_Short (996); N.sub.SD_Short for 4×996 is exactly N.sub.SD_Short (996)+ N.sub.SD_Short (996) + N.sub.SD_Short (996) + N.sub.SD_Short (996).

    [0090] The communication device 100 may be configured to add a single padding bit after every 2XN.sub.DBPS for the combination of RU values equal to 106 + 26, DCM switched-on, single stream and binary phase shift keying modulation with code-rate ½ (see Example #2 described below with respect to FIGS. 5 to 9).

    [0091] The pre&post-FEC parameters are also called “pre&post-FEC padding parameters” since these are the padding bits for the last symbol of a data frame. With pre&post-FEC padding, portions of ¼ of the last OFDM symbol (i.e. ¼, ½, ¾) are padded after encoding; these portions need not be decoded.

    [0092] The extended set of PE parameters may be defined for at least one of an extended modulation scheme of 4K-QAM or higher, an extended number of spatial streams greater than 8 and an extended bandwidth of 240 MHz, 320 MHz or higher (see Example #3 described below with respect to FIGS. 5 to 9).

    [0093] The extended set of PE parameters may be based on an extension of a PHY packet extension, PPE, thresholds field defined for the second radio transmission technology, wherein the PPE thresholds 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 #3a described below with respect to FIGS. 5 to 9). NSTS is a subfield of PPE thresholds field that defines the maximum number of space time streams supported by a Station.

    [0094] The extended set of PE parameters may be based on an extension of a resource unit allocation index field defined for the second radio transmission technology, wherein the extended resource unit allocation index field comprises extended resource unit allocation sizes of 3×996 and/or 4×996 or higher (see Example #3a described below with respect to FIGS. 5 to 9).

    [0095] The extended set of PE parameters may be based on an extension of a constellation index field defined for the second radio transmission technology, wherein the extended constellation index field comprises one or more extended constellations of 4096-QAM or higher (see Example #3a described below with respect to FIGS. 5 to 9).

    [0096] The extended set of PE parameters may be based on reusing a PHY packet extension, PPE, thresholds field defined for the second radio transmission technology, wherein the PPE thresholds field is defined for modulation schemes less or equal than 1K-QAM, a number of spatial streams less or equal than 8 and resource unit sizes less or equal than 2×996 (see Example #3b described below with respect to FIGS. 5 to 9).

    [0097] The extended set of PE parameters may be based on reusing a PPE thresholds field defined for the second radio transmission technology and based on using a single bit indicating the use of a modulation scheme of 4K-QAM (see Example #3c described below with respect to FIGS. 5 to 9).

    [0098] The extended set of PE parameters may be based on: using a single bit indicating the use of a modulation scheme of 4K-QAM, including a constellation of 4096-QAM in an extended constellation index field, and extending a PPE thresholds field defined for the second radio transmission technology by extending the NSTS subfield size to at least 4 bits in order to support up to 16 spatial streams (see Example #3d described below with respect to FIGS. 5 to 9).

    [0099] The extended set of PE parameters may be based on: using a single bit indicating the use of a modulation scheme of 4K-QAM, including a constellation of 4096-QAM in an extended constellation index field, and extending a PPE thresholds field defined for the second radio transmission technology by extending the size of a resource unit index bitmask to at least 6 bits (see Example #3e described below with respect to FIGS. 5 to 9).

    [0100] The extended set of PE parameters may be based on: using a single bit indicating the use of a modulation scheme of 4K-QAM, including a constellation of 4096-QAM in an extended constellation index field, and extending a PPE thresholds 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 FIGS. 5 to 9).

    [0101] FIG. 2 shows a schematic diagram illustrating Post-FEC and PE in IEEE 802.11ax.

    [0102] In order to relax processing requirements with 4X symbol duration, considering SIFS (Short Interframe Space) time for responding, some padding at the end of the packet that does not contain any information is inserted. This padding artificially increases the packet, allowing the receiver to complete the decoding processing. In 802.11 ax Packet Extension (PE) and pre&post-FEC padding were introduced. These 2 mechanisms considered the maximal combination of number of spatial streams (8), RU size (2×996) and QAM modulation (1K). As 802.11be is going to support higher values, i.e. 16 spatial streams, 4×996 and 4K-QAM, the definitions, signalling and usage of PE & pre&post-FEC padding needs to be revised as presented in this disclosure.

    [0103] In the current 802.11ax standard (IEEE P802.11ax™/D6.1), there are 4 sizes of resource units (RUs) that are relevant to Packet Extension: 242, 484, 996, and 2×996. In addition, up to eight spatial streams are supported and the highest supported modulation is 1K-QAM. Therefore, theoretically, a receiver may need to process a PPDU (Physical Protocol Data Unit) that contains 8 spatial stream, over 160 MHz (RU=2×996) with 1K-QAM modulation. This case may be laborious and require some extra time and/or extra HW to complete.

    [0104] In order to relax processing requirements with 4X symbol duration, considering SIFS time for responding, 802.11ax introduced Packet Extension (PE) and pre&post-FEC padding.

    [0105] In FIG. 2, four scenarios 210, 220, 230, 240 are shown having different lengths of padding bits in the last OFDM symbol of the packet (left side of FIG. 2) and packet extension segment that may follow the last OFDM symbol (right side of FIG. 2). In all scenarios it is assumed that the packet consists of N.sub.SYM OFDM symbols so that the last OFDM symbol’s index is N.sub.SYM. In the first scenario 210, number of FEC output bits 211 in the last OFDM symbol occupy ¼ of the symbol and is small with respect to number of Post FEC Padding bits 212 which occupy ¾ of the symbol. After OFDM modulation 201, data field 213 in the last OFDM symbol is provided such that no packet extension is required, therefore not applied.

    [0106] In the second scenario 220, number of FEC output bits 221 in the last OFDM symbol occupy ½ of the symbol and is about the same length than number of Post FEC Padding bits 222 which occupy ½ of the symbol as well. After OFDM modulation 201, data field 223 in the last OFDM symbol is provided such that still no packet extension is required, therefore not applied.

    [0107] In the third scenario 230, number of FEC output bits 231 in the last OFDM symbol occupy ¾ of the symbol and is long with respect to number of Post FEC Padding bits 232 which occupy ¼ of the symbol. After OFDM modulation 201, data field 233 in the last OFDM symbol is provided and a packet extension, PE 234 of 4 microseconds is required, therefore appended to data field 233.

    [0108] In the fourth scenario 240, number of FEC output bits 241 in the last OFDM symbol occupy the whole symbol, therefore is provided without Post FEC Padding bits. After OFDM modulation 201, data field 243 in the last OFDM symbol is provided and a packet extension, PE 244 of 8 microseconds is required, therefore appended to data field 243.

    [0109] With Pre&post-FEC padding, portions of ¼ of the last OFDM symbol (i.e. ¼, ½, ¾) are padded after encoding; these portions need not to be decoded.

    [0110] FIG. 2 shows the post-FEC and PE defined in 802.11ax for 8 usec (microseconds) nominal packet padding.

    [0111] There are several parameters defined in the 802.11ax specification, which are used to determine where (post-FEC) padding begins:

    [0112] Parameter N.sub.SD_Short, defined explicitly in the 802.11 ax specification and shown here below in Table 1, defines the number of tones, used within the last OFDM symbol, and is always approximately ¼ the number of tones; the rest of the tones within the last symbol are used as post-FEC. Parameter NCBPS_Short is dependent on N.sub.SD_Short. Parameter N.sub.DBPS_Short is dependent on N.sub.CBPS_Short. Note that not all RU sizes are an integer multiple of 4. The values of N.sub.SD_Short were also chosen such that N.sub.CBPS_Short, N.sub.DBPS_Short and N.sub.DBPS_Short /N.sub.ES are integers.

    [0113] Table 1 below shows the values of parameter N.sub.SD_Short, depending on RU size and DCM (Dual Carrier Modulation) switched on (DCM=1) or switched-off (DCM=0).

    TABLE-US-00002 N.sub.SD_Short for various RU sizes RU Size N.sub.SD_Short DCM=0 DCM=1 26-tone 6 2 52-tone 12 6 106-tone 24 12 242-tone 60 30 484-tone 120 60 996-tone 240 120 2x996-tone 492 246

    [0114] DCM (Dual Carrier Modulation) is a technique, supported in IEEE 802.11ax, where the same bits are transmitted twice (in two modulated QAMs on two tones that are relatively far from each-other) in order to increase the diversity. This means the effective coding rate is halved, compared to when DCM is not used. There are two cases where the number of info data bits per symbol (N.sub.DBPS) used within an OFDM symbol, for DCM=1, is not exactly half the corresponding number of coded data bits per symbol (N.sub.CBPS) for DCM=0 (these are MCS 0 with RU size 106-tones and MCS 0 with RU size 242-tones). Hence, the 802.11ax spec mandates that for these two cases, an additional padding bit is added to every OFDM symbol, and this bit can be set to 0 or 1.

    [0115] FIG. 3A shows a schematic diagram illustrating PPE Threshold field 310 in IEEE 802.11ax.

    [0116] The PPE Threshold field 310 includes a NSTS field 311 of 3bits size indicating the number of stations, a RU Index Bitmask 312 of 4 bits size, a PPE Thresholds Info field 320 of variable size and a PPE Pad field 314 of size 0 to 7 bits.

    [0117] Packet Extension Threshold can be defined as follows:

    [0118] A Station (STA) can report its required nominal packet extension for each combination of N.sub.STS, RU size and modulation. The STA reports a PPE Thresholds field 310, as shown in FIG. 2, where: [0119] N.sub.STS, 311, is the maximum number of STSs defined in the report; [0120] RU index 312 defines the RU sizes for which the thresholds are included as shown in

    TABLE-US-00003 of IEEE 802.11 ax (see below) RU allocation index RU allocation size 0 242 1 484 2 996 3 2×996 Table 9-321e of IEEE 802.11ax - RU allocation index

    [0121] PPE Thresholds defines 2×3 bits per combination of RU and N.sub.STS, where each 3 bits corresponds to a modulation, as shown in FIG. 3B.

    [0122] A STA receiving this frame compares the values for PPET8 and PPET16 and determines nominal packet padding for each combination.

    [0123] After receiving the PPE Thresholds field from a second STA, the first STA uses the combination of the PPET8 N.sub.STSn RU.sub.b subfield and PPET16 N.sub.STSn RU.sub.b subfield values to determine the nominal packet padding for HE PPDUs that are transmitted to the second STA using N.sub.STS = n and an RU allocation corresponding to RU Allocation Index b, for each value of N.sub.STS and RU specified by the field (see FIG. 4). The nominal packet padding is used in computing the PE field duration (see 27.3.13 of 802.11ax spec (Packet extension)).

    [0124] FIG. 3B shows a schematic diagram illustrating PPE Threshold Info field 320 in IEEE 802.11ax. The PPE Threshold Info field 320 includes a PPET16 NSTS1 RUx field 321 of 3bits size, a PPET8 NSTS1 RUx field 322 of 3bits size, further bit fields, a PPET16 NSTS1 RUm field 323 of 3bits size, a PPET8 NSTS1 RUm field 324, further bit fields, a PPET16 N.sub.STSn RUm field 325 of 3bits size and a PPET8 N.sub.STSn RUm field 326 of 3bits size.

    [0125] FIG. 4 shows guidelines 400 for decision of packet extension padding duration in IEEE 802.11ax. FIG. 4 shows how a transmitting STA decides which PE is required by the receiving STA based on the thresholds field info.

    [0126] However, the above procedure is limited to the number of spatial streams, the bandwidth and the highest modulation defined in IEEE 802.11ax. The new WiFi standard IEEE 802.11be will support the following advanced features: 240 MHz/320 MHz; Multi-RUs (e.g. RU242+RU484 are combined to a new RU with anew size); 4K-QAM; and 16 spatial streams. The current WiFi specification IEEE 802.11ax does not have a solution for these cases, therefore it cannot be used as is in the new WiFi standard IEEE 802.11be.

    [0127] 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 disclosure are suitable to the new features that are added to the new standard IEEE 802.11be. FIGS. 5 to 9 illustrate the new frame formats for using these new pre&post-FEC and packet extension mechanisms.

    [0128] In particular, FIG. 5 shows the new PPE Thresholds field format 510 together with the new PPE Thresholds Info field format 520. The PPE Thresholds field format 510 includes a 4bit N.sub.STS511, a 6bit RU Index Bitmask 512, a variable PPE Thresholds Info field 520 and a 0 to 7bit PPE Pad field 514. The PPE Thresholds Info field 520 includes a 3bit PPET16 N.sub.STS1 RU.sub.x field 521, a 3bit PPET8 NSTS.sub.1 RU.sub.x field 522, further fields, a 3bit PPET16 N.sub.STS1 RU.sub.m field 523, a 3bit PPET8 N.sub.STS1 RU.sub.m field 524, further fields, a 3bit PPET16 N.sub.STSn RU.sub.m field 525 and a 3bit PPET8 N.sub.STSn RU.sub.m field 526.

    [0129] FIG. 6A shows the new frame format 610 with 4K-QAM additional capability bit. The new frame format 610 includes a 1bit 4K-QAM Delta field 611 and a 7bit PPE Pad field 612. FIG. 6B shows the new frame format 620 with 4K-QAM additional capability bits. The new frame format 620 includes a variable bit size 4K-QAM Delta field 621 and a 0 to 7bit PPE Pad field 622.

    [0130] FIG. 7A shows the new PPE Thresholds field format 710 supporting 4K-QAM and more than 8 spatial streams. The PPE Thresholds field format 710 includes a 1bit 4K-QAM Delta field 711, a 4bit N.sub.STS712, a 4bit RU Index Bitmask 713, a variable bit-size PPE Thresholds Info field 720 and a 0 to 7bit PPE Pad field 715.

    [0131] FIG. 7B shows the new PPE Thresholds Info field format 720 supporting 4K-QAM and more than 8 spatial streams. The PPE Thresholds Info field 720 includes a 3bit PPET16 N.sub.STS1 RU.sub.X field 721, a 3bit PPET8 N.sub.STS1 RU.sub.X field 722, further fields, a 3bit PPET16 N.sub.STS1 RU.sub.m field 723, a 3bit PPET8 N.sub.STS1 RU.sub.m field 724, further fields, a 3bit PPET16 N.sub.STSn RU.sub.m field 725 and a 3bit PPET8 N.sub.STSn RU.sub.m field 726.

    [0132] FIG. 8A shows the new PPE Thresholds field format 810 supporting 4K-QAM and additional RUs. The PPE Thresholds field format 810 includes a 1bit 4K-QAM Delta field 811, a 3bit N.sub.STS812, a 6bit RU Index Bitmask 813, a variable bit-size PPE Thresholds Info field 820 and a 0 to 7bit PPE Pad field 815.

    [0133] FIG. 8B shows the new PPE Thresholds Info field format 820 supporting 4K-QAM and additional RUs. The PPE Thresholds Info field 820 includes a 3bit PPET16 N.sub.STS1 RU.sub.x field 821, a 3bit PPET8 N.sub.STS1 RU.sub.x field 822, further fields, a 3bit PPET16 N.sub.STS1 RU.sub.m field 823, a 3bit PPET8N.sub.STS1 RU.sub.m field 824, further fields, a 3bit PPET16 N.sub.STSn RU.sub.m field 825 and a 3bit PPET8 N.sub.STSn RU.sub.m field 826.

    [0134] FIG. 9A shows the new PPE Thresholds field format 910 supporting 4K-QAM, additional NRUs and more than 8 spatial streams. The PPE Thresholds field format 910 includes a 1bit 4K-QAM Delta field 911, a 4bit N.sub.STS912, a 6bit RU Index Bitmask 913, a variable bit-size PPE Thresholds Info field 920 and a 0 to 7bit PPE Pad field 915.

    [0135] FIG. 9B shows the new PPE Thresholds Info field format 920 supporting 4K-QAM and additional RUs and more than 8 spatial streams. The PPE Thresholds Info field 920 includes a 3bit PPET16 N.sub.STS1 RU.sub.x field 921, a 3bit PPET8 N.sub.STS1 RU.sub.x field 922, further fields, a 3bit PPET16 N.sub.STS1 RU.sub.m field 923, a 3bit PPET8 N.sub.STS1 RU.sub.m field 924, further fields, a 3bit PPET16N.sub.STSn RU.sub.m field 925 and a 3bit PPET8 N.sub.STSn RU.sub.m field 926.

    [0136] In the following, introduction of pre&post-FEC and packet extension mechanisms is described with respect to FIGS. 5 to 9 to support IEEE 802.11be. [0137] 1. Support is added for new values of N.sub.SD_Short that correspond to the size of the new multi-RU sizes. [0138] a. The following rows shown below (see Table 2) are added to the N.sub.SD_Short table. These values are the linear combination of the respective, existing 802.11ax RU values, since the requirements mentioned earlier are met. [0139] b. The equation (right side on Table 2) defines how the value of N.sub.SD_Short is determined based on 802.11ax values, (for the 802.11ax defined RUs)

    TABLE-US-00004 N.sub.SD_Short new values RU Size N.sub.SD_Short Equation DCM=0 DCM=1 52+26 18 8 RU52+RU26 106+26 30 14 RU106+RU26 484+242 180 or 174 90 RU484+RU242 996+484 360 180 RU996+RU484 242+484+996 420 210 RU242+RU484+RU996 484+2×996 600 or 606 or 612 300 or 306 RU484+2×RU996 3×996 720 or 726 or 738 360 or 366 3×RU996 484+3×996 840 or 846 or 852 420 or 426 RU484+3×RU996 4×996 978 or 984 or 990 486 or 492 4×RU996

    [0140] 2. For the case of 106+26, the following parameters with DCM=1, a single stream and MCS 0 apply: [0141] N.sub.CBPS =51+12=63 [0142] N.sub.DBPS =25+6=31 Hence, similar to 106 and 242-tone RUs, in 106+26 MRU: 63=2×31+1, so after every 2×NDBPS coded bits, a single padding bit (either 0 or 1) is added. [0143] 3. Addressing the accommodation of 4K-QAM, NSS>8 and 240/320 MHz in the PPE Threshold field in the following scenarios [0144] a. Full support within 11be (only within EHT capabilities, doesn’t rely on HE capabilities). [0145] I. Change the PPE Thresholds field (including sub-fields) to accommodate 4K-QAM (see Table 3 below), 2×1992 tones RU size (see Table 4 below) and 16 streams (see FIG. 5), as shown below. [0146] II. Note: Multi-RU are not defined here, it is relied instead on larger RUs [0147] III. New values with respect to IEEE 802.11ax are Constellation index 6 with transmission constellation 4096-QAM in Table 3, RU allocation index 4 with RU allocation size 3×996 in Table 4, RU allocation index 5 with RU allocation size 4×996 in Table 5, N.sub.STS field 511 having a number of 4 bits and RU index bitmask 512 having a number of 6 bits in FIG. 5.

    TABLE-US-00005 Constellation Index Constellation Index Corresponding Transmission Constellation 0 BPSK 1 QPSK 2 16-QAM 3 64-QAM 4 256-QAM 5 1024-QAM 6 4096-QAM 7 None

    TABLE-US-00006 RU Allocation Index RU Allocation Index RU Allocation Size 0 242 1 484 2 996 3 2×996 4 3×996 5 4×996

    [0148] b. For STAs that are compatible to HE i.e. supports up to 8 spatial streams, BW up to 160 MHz and modulation up to 1K-QAM: PPE Thresholds table from HE capabilities is sufficient. [0149] c. For STAs that are compatible to HE as in item b[0135] and in addition support 4K-QAM, two solutions can be applied, such that it is not required to transmit the ‘full’ capability in HE and EHT, but rather capability in HE and then only the additional capability (‘delta’) in EHT - this is true for all cases below (including items ‘d’, ‘e’ etc.): [0150] I. The capability field 610 will include an additional bit 611 as shown in FIG. 6A that [0151] i. Means, if set to ‘1’, that all cases where combinations ofNss and N.sub.RU yield PPET8=‘1K-QAM’ and PPET16=‘NONE’, should be translated to PPET16=‘4K-QAM’ [0152] ii. If this bit is set to ‘0’, then PPET16 remains ‘NONE’ [0153] iii. New values 611 with respect to IEEE 802.11ax are shown in FIG. 6A. [0154] II. The capability field 620 will include an additional bit 621 per combination of N.sub.SS and N.sub.RU as shown in FIG. 6B that [0155] iv. Means, if set to ‘1’, that for each specific case, where combinations of N.sub.SS and N.sub.RU yield PPET8=’ 1K-QAM’ and PPET16=‘NONE’, should be translated to PPET16=‘4K-QAM’ [0156] v. If this bit 621 is set to ‘0’, then PPET16 remains ‘NONE’ [0157] vi. Thus, a total of N.sub.SS*N.sub.RU bits is added. [0158] vii. New values 621 with respect to IEEE 802.11ax are shown in FIG. 6B. [0159] III. As an alternative to items I and II above (or further option or embodiment), the capability fields 610 in FIG. 6A and 620 in FIG. 6B will not include the additional bits 611, 621. In this option, 4K-QAM can be indicated in EHT (802.11be) without any additional bit 611, 621. So, the only change is the additional value of 4096 in Table 3 shown above. This option is backward compatible with HE (802.11ax) because an HE device will consider the indication “6” as “NONE” anyway because it does not know 4K-QAM. [0160] d. For STAs that are capable of supporting 4K-QAM and beyond 8 spatial streams the scheme shown in FIGS. 7A and 7B can be applied: [0161] I. Transmit single 4K-QAM delta bit as before [0162] II. For each combination of N.sub.SS and N.sub.RU that was not defined, need to define the PPET8/16 value [0163] III. Constellation index is modified identical to Table 3 [0164] IV. Thus, 1+(N.sub.SS-8)*N.sub.RUs,11.sub.ax*6 bits are added [0165] V. New values 711 with respect to IEEE 802.11 ax are shown in FIG. 7A. [0166] e. For STAs that are capable of supporting 4K-QAM and additional RUs (respective to 802.11 ax) the scheme shown in FIGS. 8A and 8B can be applied: [0167] I. Transmit single 4K-QAM delta bit as before [0168] II. For each combination of N.sub.SS and N.sub.RU that was not defined, need to define the PPET8/16 value [0169] III. Constellation index is modified identical to Table 3 [0170] IV. Thus, 1+N.sub.SS*(N.sub.RUs,11be-N.sub.RUs,11ax)*6 bits are added [0171] V. New values 811 with respect to IEEE 802.11 ax are shown in FIG. 8A. [0172] f. For STAs that are capable of supporting 4K-QAM, additional RUs (respective to 802.11ax) and beyond 8 spatial streams, the scheme shown in FIGS. 9A and 9B can be applied: [0173] I. Transmit single 4K-QAM delta bit as before [0174] II. For each combination of NSS and NRU that was not defined, need to define the PPET8/16 value [0175] III. Constellation index is modified identical to Table 3 [0176] IV. Thus, 1+[N.sub.SS*(N.sub.RUs,.sub.11be-N.sub.RUs,.sub.11ax)+(N.sub.SS-8)*N.sub.RUs,.sub.11ax]*6 bits are added. [0177] V. New values 911 with respect to IEEE 802.11ax are shown in FIG. 9A.

    [0178] By using these changes, a communication device 100 can be provided as described above with respect to FIG. 1.

    [0179] Such communication device 100 is configured to: transmit and/or receive a data frame based on a set of pre&post-Forward Error Correction, FEC, parameters and a set of packet extension, PE, parameters. The set of pre&post-FEC parameters is based on an extension of a set of pre&post-FEC parameters defined for a second radio transmission technology with respect to a size of resource units, RUs, supported by a first radio transmission technology, wherein the set of pre&post-FEC parameters is based on a combination of RUs that is supported by the first radio transmission technology. The set of PE parameters is based on an extension of a 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.

    [0180] The communication device 100 may be configured to: determine where a post-padding begins in the data frame based on the set of pre&post-FEC parameters, wherein the set of pre&post-FEC parameters is based on: an integer number of data subcarriers for a last symbol of the data frame, N.sub.SD_Short, as defined by an extended N.sub.SD_Short table, wherein the extended N.sub.SD_Short table is an extension of a N.sub.SD_.sub.Short table defined by the second radio transmission technology with respect to additional values of N.sub.SD_Short defined by the first radio transmission technology, an integer number of coded bits per symbol for the last symbol of the data frame, N.sub.CBPS_Short, wherein N.sub.CBPS_Short depends on N.sub.SD_Short, and an integer number of data bits per symbol for the last symbol of the data frame, N.sub.DBPS_.sub.Short, wherein N.sub.DBPS_Short depends on N.sub.CBPS_Short.

    [0181] The pre&post-FEC parameters are also called “pre&post-FEC padding parameters” since these are the padding bits for the last symbol of a data frame. With pre&post-FEC padding, portions of ¼ of the last OFDM symbol (i.e. ¼, ½, ¾) are padded after encoding; these portions need not be decoded.

    [0182] Different options apply for this set of pre&post-FEC parameters and this set of PE parameters as described in the following:

    [0183] In a first option (Example #1), new rows are added to the N.sub.SD_Short table as shown above in Table 2. These values are the linear combination of the respective, existing 802.11 ax RU values, since the requirements mentioned earlier are met. The equation defines how the value of N.sub.SD_Short is determined based on 802.11ax values (for the 11ax defined RUs).

    [0184] The extended N.sub.SD_Short 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 + 2×996, 3×996, 484 + 3×996, 4×996.

    [0185] A value of N.sub.SD_Short for a combination of a first RU and a second RU that is supported by the first radio transmission technology may correspond to an addition of an N.sub.SD_Short value for the first RU and an N.sub.SD_Short value for the second RU, the first RU and the second RU being supported by the second radio transmission technology.

    [0186] For example, possible combinations are the following: N.sub.SD_Short for 484+242 is exactly N.sub.SD_Short (242)+ N.sub.SD_Short (484); N.sub.SD_Short for 52+26 is exactly N.sub.SD_Short (52)+ N.sub.SD_Short (26); N.sub.SD_Short for 106+26 is exactly N.sub.SD_Short (106)+ N.sub.SD_Short (26); N.sub.SD_Short for 996+484 is exactly N.sub.SD_Short (996)+ N.sub.SD_Short (484); N.sub.SD_Short for 242+484+996 is exactly N.sub.SD_Short (242)+ N.sub.SD_Short (484) + N.sub.SD_Short (996); N.sub.SD_Short for 484+2×996 is exactly N.sub.SD_Short (484)+ N.sub.SD_Short (996) + N.sub.SD.sub._.sub.Short (996); N.sub.SD_Short for 3×996 is exactly N.sub.SD_Short (996)+ N.sub.SD_Short (996) + N.sub.SD_Short (996); N.sub.SD_Short for 484+3×996 is exactly N.sub.SD_Short (484)+ N.sub.SD_Short (996) + N.sub.SD_Short (996) + N.sub.SD_Short (996); N.sub.SD_Short for 4×996 is exactly N.sub.SD_Short (996)+ N.sub.SD_Short (996) + N.sub.SD_Short (996) + N.sub.SD_Short (996).

    [0187] In a second option (Example #2), for the case of 106+26, there are the following parameters with DCM=1, a single stream and MCS 0:

    [00001]• NCBPS=51+12=63

    [00002]• NDBPS=25+6=31

    [0188] Hence, similar to 106 and 242-tone RUs, in 106+26 MRU: 63=2×31+1, so after every 2xN.sub.DBPS coded bits, a single padding bit (either 0 or 1) is added.

    [0189] The communication device 100 may be configured to add a single padding bit after every 2XN.sub.DBPS for the combination of RU values equal to 106 + 26, DCM switched-on, single stream and binary phase shift keying modulation with code-rate ½.

    [0190] The pre&post-FEC parameters are also called “pre&post-FEC padding parameters” since these are the padding bits for the last symbol of a data frame. With pre&post-FEC padding, portions of ¼ of the last OFDM symbol (i.e. ¼, ½, ¾) are padded after encoding; these portions need not be decoded.

    [0191] In a third option (Example #3), the accommodation of 4K-QAM, Nss>8 and 240/320 MHz is addressed in the PPE Threshold field, considering the following scenarios: [0192] Full support within 11be (only within EHT capabilities, does not rely on HE capabilities) - described in Example #3a [0193] Relying on HE capabilities, then differentiation between different cases as shown in Table 5 can be performed:

    TABLE-US-00007 different Examples when relying on HE capabilities Case Max RU Size Max Nss Max Modulation Described in 1 ≥2×996 ≥8 ≥1K-QAM Example #3b 2 ≥2×996 ≥8 4K-QAM Example #3c 3 ≥2×996 >8 4K-QAM Example #3d 4 >2×996 ≥8 4K-QAM Example #3e 5 >2×996 >8 4K-QAM Example #3f

    [0194] In the communication device 100, the extended set of PE parameters may be defined for at least one of an extended modulation scheme of 4K-QAM or higher, an extended number of spatial streams greater than 8 and an extended bandwidth of 240 MHz, 320 MHz or higher.

    [0195] The extended set of PE parameters may be based on an extension of a PHY packet extension, PPE, thresholds field defined for the second radio transmission technology, The PPE thresholds field 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.

    [0196] NSTS is a subfield of PPE thresholds field that defines the maximum number of space time streams supported by a Station.

    [0197] In case 0 of third option (Example #3a), full support within EHT is provided. The procedure corresponds to Table 3 and Table 4 shown above together with FIG. 5, i.e.: Change the PPE Thresholds field 510 (including sub-fields 511, 512, 520, 514) to accommodate 4K-QAM, 2×1992 tones RU size and 16 streams, as shown in Table 3 and Table 4. Note: Multi-RU are not defined here, it is relied instead on larger RUs.

    [0198] In the communication 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 radio transmission technology. The extended resource unit allocation index field may comprise extended resource unit allocation sizes of 3×996 and/or 4×996 or higher.

    [0199] The extended set of PE parameters may be based on an extension of a constellation index field defined for the second radio transmission technology. The extended constellation index field may comprise one or more extended constellations of 4096-QAM or higher.

    [0200] In case 1 of third option (Example #3b), HE capabilities are re-used for STAs that support up to 8SS, 160 MHz BW and 1K-QAM. PPE Thresholds table from HE capabilities is hence sufficient.

    [0201] In the communication device 100, the extended set of PE parameters may be based on reusing a PHY packet extension, PPE, thresholds field defined for the second radio transmission technology. The PPE thresholds field may be defined for modulation schemes less or equal than 1K-QAM, a number of spatial streams less or equal than 8 and resource unit sizes less or equal than 2×996.

    [0202] In case 2 of third option (Example #3c), HE capabilities is sufficient to describe everything but 4K-QAM. The solution is to transmit a single bit 611 as shown in FIG. 6A, that means, if set to ‘1’, that all cases where combinations of NSTS and RU_index yield PPET8=‘1K-QAM’ and PPET16=‘NONE’, should be translated to PPET16=‘4K-QAM’. If this bit is set to ‘0’, then PPET16 remains ‘NONE’. Thus, one bit is added.

    [0203] In the communication device 100, the extended set of PE parameters may be based on reusing a PPE thresholds field defined for the second radio transmission technology and based on using a single bit 611 indicating the use of a modulation scheme of 4K-QAM.

    [0204] In case 3 of third option (Example #3d), HE capabilities is sufficient to describe everything but 4K-QAM & beyond 8 streams. In this case as illustrated by FIGS. 7A and 7B, single 4K-QAM delta bit is transmitted as before (see case 2). For each combination of Nss and N.sub.RU that was not defined, need to define the PPET8/16 value. Constellation index is modified identically to Example #3a. Thus, 1+(N.sub.SS-8).sup.∗N.sub.RUs,.sub.11ax.sup.∗6 bits are added.

    [0205] PPE threshold field format 810 is illustrated in FIGS. 7A and 7B. In one Example, following parameters apply: Nss=12, RUs index bitmask 1110 (corresponding to supporting 20 MHz, 40 MHz & 80 MHz). In an Example, the following extension duration required for Nsts=9 apply: For RU=20: PPET16 is required when the modulation is 1KQAM and PPET8 is required in 64QAM. For RU=40: PPET16 is required when the modulation is 4KQAM and PPET8 is required in 64QAM. For RU=80: PPET16 is never required and PPET8 is required in 256QAM. In this example, Table 3 shown above applies in which the new line for constellation index 6 and transmission constellation 4096-QAM is added as shown in Table 3.

    [0206] In the communication device 100, the extended set of PE parameters may be based on: using a single bit indicating the use of a modulation scheme of 4K-QAM, including a constellation of 4096-QAM in an extended constellation index field, and extending a PPE thresholds field defined for the second radio transmission technology by extending the NSTS subfield size to at least 4 bits in order to support up to 16 spatial streams.

    [0207] In case 4 of third option (Example #3e), HE capabilities is sufficient to describe everything but 4K-QAM & additional RUs. In this case as illustrated by FIGS. 8A and 8B, single 4K-QAM delta bit 811 is transmitted as before. For each combination of N.sub.SS and N.sub.RU that was not defined, need to define the PPET8/16 value. Constellation index is modified identical to Example #3a. Thus, 1+N.sub.SS*(N.sub.RUs,11be-N.sub.RUs,11ax)*6 bits are added.

    [0208] In one Example, as shown in FIGS. 8A and 8B, PPE threshold field 810 and PPE Thresholds Info field format 820 are as shown in FIGS. 8A and 8B. The following parameters apply: Nss=4, RUs index bitmask 000110 (corresponding to supporting 160 MHz & 240 MHz). It also applies that Max Nsts=4.

    [0209] In the communication device 100, the extended set of PE parameters may be based on: using a single bit indicating the use of a modulation scheme of 4K-QAM, including a constellation of 4096-QAM in an extended constellation index field, and extending a PPE thresholds field defined for the second radio transmission technology by extending the size of a resource unit index bitmask to at least 6 bits.

    [0210] In case 5 of third option (Example #3f), HE capabilities is sufficient to describe everything but 4K-QAM, additional RUs and beyond 8 streams, so we need to account for all combinations. In this case as illustrated by FIGS. 8A and 8B, single 4K-QAM delta bit is transmitted as before. For each combination of N.sub.SS and N.sub.RU that was not defined, need to define the PPET8/16 value. Constellation index is modified identical to Example #3a. Thus, 1+[N.sub.SS.sup.∗(N.sub.RUs,11be-N.sub.RUs,11ax)+(N.sub.SS-8).sup.∗N.sub.RUs,11ax].sup.∗6 bits are added.

    [0211] In the communication device 100 the extended set of PE parameters may be based on: using a single bit indicating the use of a modulation scheme of 4K-QAM, including a constellation of 4096-QAM in an extended constellation index field, and extending a PPE thresholds 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.

    [0212] FIG. 10 shows a schematic diagram of a communication method 1000 according to the disclosure.

    [0213] The communication method 1000 comprises transmitting and/or receiving 1001 a data frame based on a set of pre&post-Forward Error Correction, FEC, parameters and a set of packet extension, PE, parameters, e.g. as described above with respect to FIGS. 1 to 9. The set of pre&post-FEC parameters is based on an extension of a set of pre&post-FEC parameters defined for a second radio transmission technology with respect to a size of resource units, RUs, supported by a first radio transmission technology. The set of pre&post-FEC parameters is based on a combination of RUs that is supported by the first radio transmission technology and the set of PE parameters is based on an extension of a 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.

    [0214] The first and second radio transmission technologies can be WiFi technologies, the second radio transmission technology can be an existing WiFi technology, while the first radio technology can be a new WiFi technology, e.g. a new WiFi technology having higher bandwidth, multi-resource units and/or higher constellation scheme. For example, the first radio transmission technology can be IEEE 802.11be WiFi and the second radio transmission technology can be IEEE 802.11ax WiFi.

    [0215] The first and second radio transmission technologies can be the same (with different settings) or different (with different capabilities).

    [0216] A multiple RU as defined by the new first radio transmission technology is formed from a combination of two or more RUs defined by the old second radio transmission technology.

    [0217] The present disclosure also supports a computer program product including computer executable code or computer executable instructions that, when executed, causes at least one computer to execute the performing and computing steps described herein, in particular the methods and procedures described above. Such a computer program product may include a readable non-transitory storage medium storing program code thereon for use by a computer. The program code may perform the processing and computing steps described herein, in particular the methods and procedures described above.

    [0218] While a particular feature or aspect of the disclosure may have been 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 the other implementations as may be desired and advantageous for any given or particular application. Furthermore, to the extent that the terms “include”, “have”, “with”, or other variants thereof are used in either the detailed description or the claims, such terms are intended to be inclusive in a manner similar to the term “comprise”. Also, the terms “exemplary”, “for example” and “e.g.” are merely meant as an example, rather than the best or optimal. The terms “coupled” and “connected”, along with derivatives may have been used. It should be understood that these terms may have been used to indicate that two elements cooperate or interact with each other regardless whether they are in direct physical or electrical contact, or they are not in direct contact with each other.

    [0219] Although specific aspects have been illustrated and described herein, it will be appreciated by those of ordinary skill in the art that a variety of alternate and/or equivalent implementations may be substituted for the specific aspects shown and described without departing from the scope of the present disclosure. This application is intended to cover any adaptations or variations of the specific aspects discussed herein.

    [0220] Although the elements in the following claims are recited in a particular sequence with corresponding labeling, unless the claim recitations otherwise imply a particular sequence for implementing some or all of those elements, those elements are not necessarily intended to be limited to being implemented in that particular sequence.

    [0221] 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 readily recognize that there are numerous applications of the disclosure beyond those described herein. While the present disclosure has been described with reference to one or more particular embodiments, those skilled in the art recognize that many changes may be made thereto without departing from the scope of the present disclosure. It is therefore to be understood that within the scope of the appended claims and their equivalents, the disclosure may be practiced otherwise than as specifically described herein.