Method for acquiring resource unit allocation information in wireless communication system and related device

Abstract

A method for a station to acquire resource unit allocation information includes: receiving a first data unit, acquiring resource allocation information corresponding to the first data unit, and acquiring a format description of a common field in a first signal field about the first data unit; receiving a second data unit, and obtaining a format description of a common field in the first signal field of the second data unit; when the format descriptions of the common fields of the two data units are consistent, comparing the bits of the common fields of the two data units; and when the bits of the common fields of the first data unit and the second data unit are consistent, analyzing a user-specific field corresponding to the station in the first signal field of the second data unit by using the resource allocation information corresponding to the first data unit, and setting the station according to the user-specific field.

Description

Technical Field

[0001] The present invention relates to a wireless communication system, and in particular to a method and a related device for obtaining resource unit allocation information in a wireless communication system. Background Art

[0002] In the IEEE 802.11ax and IEEE 802.11be specifications, the station (STA) needs to parse the common field (Common Field) in the High Efficiency Signal B Field (HE-SIG-B) / Extremely High Throughput Signal Field (EHT-SIG) in the downlink multi-user physical layer protocol data unit (PPDU) given by the access point (AP) to determine the resource allocation information, such as Resource Unit (RU) Allocation and the corresponding User Block allocation. When the hardware processor searches for OFDMA (Orthogonal Frequency Division Multiple Access), MU-MIMO (Multi-User Multiple-Input Multiple-Output), and bandwidth combinations in different common fields in the HE-SIG-B field / EHT-SIG field, it often results in a large amount of processor computing resource consumption (i.e., MIPS consumption). Especially in the EHT standard, because of the addition of the Multi-Resource Unit (MRU) mechanism, the combination of resource units becomes more complicated, and more processor computing resources are required to obtain resource unit allocation information. Therefore, a method and mechanism are needed in this field to improve this problem. Summary of the invention

[0003] Therefore, the object of the present invention is to provide a common field parsing mechanism for a wireless communication system. Among them, the present invention will determine the consistency of multiple fields of the current data unit and the previous data unit, and then decide whether to skip the decoding process of the common field. In an embodiment of the present invention, it will first be determined whether the format description of the common field in the EHT-SIG field or HE-SIG-B field given by the U-SIG field or HE-SIG-A field of the current data unit and the previous data unit is consistent. When the format descriptions of the two are consistent, the contents of the common fields in the EHT-SIG field / HE-SIG-B field of the current data unit and the previous data unit are further compared to see whether they are completely consistent. And when the contents of the common fields of the two are completely consistent, the decoding of the common fields in the EHT-SIG field or HE-SIG-B field of the current data unit is skipped, and the decoding process of the user-specific field in the EHT-SIG field or HE-SIG-B field of the current data unit is directly entered. In this way, the computing time and resources of the processor can be saved, so that the computing resources of the processor can be better utilized and the performance power consumption ratio can be improved.

[0004] An embodiment of the present invention provides a method for a station of a wireless communication system to obtain resource unit allocation information. The method includes: receiving a first data unit from an access point of the wireless communication system, and obtaining resource allocation information corresponding to the first data unit, and obtaining a format description of a common field in a first signal field of the first data unit; receiving a second data unit, and obtaining a format description of a common field in a first signal field of the second data unit; when the format descriptions of the common field in the first signal field of the first data unit and the second data unit are consistent, comparing a plurality of bits of the common field in the first signal field of the second data unit with a plurality of bits of the common field in the first signal field of the first data unit; and when the plurality of bits of the common field in the first signal field of the first data unit and the second data unit are consistent, using the resource allocation information corresponding to the first data unit to parse a user-specific field corresponding to the station in the first signal field of the second data unit, and setting the station accordingly.

[0005] An embodiment of the present invention provides a device for a station of a wireless communication system. The device includes: a storage unit and a processor. The storage unit is used to store information and program code. The processor is used to execute the program code to perform the following operations: receiving a first data unit from an access point of the wireless communication system, and obtaining resource allocation information corresponding to the first data unit, and obtaining a format description of a common field in a first signal field of the first data unit; receiving a second data unit, and obtaining a format description of a common field in a first signal field of the second data unit; when the format descriptions of the common field in the first signal field of the first data unit and the second data unit are consistent, comparing a plurality of bits of the common field in the first signal field of the second data unit with a plurality of bits of the common field in the first signal field of the first data unit; and when the plurality of bits of the common field in the first signal field of the first data unit and the second data unit are consistent, using the resource allocation information corresponding to the first data unit to parse a user-specific field corresponding to the station in the first signal field of the second data unit, and setting the station accordingly. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 The message format and field relationship of IEEE 802.11be are shown.

[0007] Figure 2 The message format and field relationship of IEEE 802.11ax are shown.

[0008] Figure 3 A flow chart of a common field resolution mechanism in an embodiment of the present invention is shown.

[0009] Figure 4 A flow chart of a method for acquiring resource unit allocation information in an embodiment of the present invention is shown.

[0010] Figure 5 A functional block diagram of a device for executing a method for acquiring resource unit allocation information in an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0011] In the following, many specific details are described to provide readers with a thorough understanding of the embodiments of the present invention. However, those skilled in the art will understand how to implement the present invention in the absence of one or more specific details, or using other methods or components or materials, etc. In other cases, well-known structures, materials or operations will not be shown or described in detail to avoid obscuring the core concepts of the present invention.

[0012] The "embodiment" mentioned in the specification means that the specific features, structures or characteristics described in the embodiment may be included in at least one embodiment of the present invention. Therefore, the "in an embodiment" appearing in various places in this specification does not necessarily mean the same embodiment. In addition, the aforementioned specific features, structures or characteristics can be combined in one or more embodiments in any suitable form.

[0013] Please refer to Figure 1, the figure shows the downlink extremely high throughput (EHT) physical layer protocol data unit (PPDU) format of IEEE 802.11be (i.e., Wi-Fi 7). As shown in the figure, an EHT PPDU includes a legacy short training field (Legacy Short Training Field, L-STF), a legacy long training field (Legacy Long Training Field, L-LTF), a legacy signal field (Legacy Signal Field, L-SIG), a repeated legacy signal field (Repeated Legacy Signal Field, RL-SIG), a universal signal field (Universal Signal Field, U-SIG), an extremely high throughput signal field (Extremely High Throughput Signal Field, EHT-SIG), an extremely high throughput short training field (Extremely High Throughput Short Training Field, EHT-STF), an extremely high throughput long training field (Extremely High Throughput Long Training Field, EHT-LTF) and a payload (Payload). Among them, the L-STF field, L-LTF field, L-SIG field and RL-SIG field are used for message detection, synchronization and transmission of important information (for example, Modulation and Coding Scheme (MCS) and message length). The U-SIG field includes several version-independent fields (Version Independent Field), which include format descriptions of the common field (Command Field) in the EHT-SIG field. The EHT-SIG field includes a common field and multiple user-specific fields (User-Specific Field). The common field consists of common bits, cyclic redundancy check bits (CRC bits) and tail bits. The common field includes resource allocation information about resource unit allocation.Further, the resource allocation information may include resource unit assignment (Resource Unit (RU) assignment), resource unit allocation (RU allocation) and other information, which may indicate: the bandwidth is allocated to several resource units, the frequency band corresponding to each resource unit, each resource unit includes several single tones (tones) / subcarriers (subcarriers), each resource unit is allocated to which station and other information. Through the common field, the station can also know the number of user-specific fields of each content channel (Content Channel) of the EHT-SIG field and the length of each user-specific field, so that the station can correctly parse the user-specific field corresponding to itself. The user-specific fields are used to convey individual exclusive information to multiple users (i.e., multiple stations). The EHT-STF field and the EHT-LTF field are used for channel estimation in MIMO / OFDMA transmission. In order to obtain resource allocation information, the station needs to decode the U-SIG field to obtain the format description of the common field. Based on the format description of the common field obtained from the decoded U-SIG field, the station decodes the common field again to obtain resource allocation information including resource unit allocation. Then, the format of the user-specific field is further obtained, and the user-specific field is parsed. In this way, the station can be set according to the resource allocation information and the content of the user-specific field to correctly obtain the data in the effective load.

[0014] Figure 2An IEEE 802.11ax (i.e., Wi-Fi 6) high efficiency (HE) multi-user (MU) PPDU format is shown. As shown in the figure, an HE PPDU includes an L-STF field, an L-LTF field, an L-SIG field, an RL-SIG field, a High Efficiency Signal A Field (HE-SIG-A), a High Efficiency Signal B Field (HE-SIG-B), a High Efficiency Short Training Field (HE-STF), a High Efficiency Long Training Field (HE-LTF) and a payload. Among them, the L-STF field, the L-LTF field, the L-SIG field and the RL-SIG field are used for message detection, synchronization and transmission of important information (for example, Modulation and Coding Scheme (MCS) and message length). The HE-SIG-A field includes a format description of the common fields in the HE-SIG-B field. The HE-SIG-B field includes a common field and multiple user-specific fields. The common field consists of common bits, cyclic redundancy check bits, and tail bits. The common field includes resource allocation information about resource unit allocation. Further, the resource allocation information may include information such as resource unit assignment and resource unit allocation, which may indicate: the bandwidth is allocated into several resource units, the frequency band corresponding to each resource unit, each resource unit includes several single tones / subcarriers, and each resource unit is allocated to which station. Through the common field, the station can also know the number of user-specific fields for each content channel of the HE-SIG-B field and the length of each user-specific field, so that the station can correctly parse the user-specific field corresponding to itself. The user-specific fields are used to convey individual exclusive information to multiple users (ie, multiple stations). The HE-STF field and the HE-LTF field are used for channel estimation in MIMO / OFDMA transmission. In order to obtain resource allocation information, the station needs to decode the HE-SIG-A field to know the format description of the common field. Based on the format description of the common field obtained from decoding the HE-SIG-A field, the station decodes the common field to obtain resource allocation information including resource unit allocation, and then further obtains the format of the user-specific field and parses the user-specific field.In this way, the station can be configured according to the resource allocation information and the content of the user-specific field to correctly obtain the data in the payload.

[0015] As can be seen from the above, whether in the IEEE 802.11ax or IEEE 802.11be standard, decoding of the common field is an important step in receiving information. Therefore, the present invention proposes an optimized process for decoding the common field.

[0016] Please refer to Figure 3 , which shows a common field decoding process based on an embodiment of the present invention. This process is a decoding process for a common field of a content channel, which includes (but is not limited to) three stages, namely: a parsing stage, a repeatability judgment stage, and an RU allocation parsing stage. After completing the parsing stage, the repeatability judgment stage will be entered, and based on the result of the repeatability judgment stage, it is decided whether to enter the RU allocation parsing stage.

[0017] The parsing phase starts from step 301 and ends at step 306, which is mainly used to determine whether the content of the common field in the content channel has been received and decode it after receiving. First, in step 301, it is determined whether the parsing of the current content channel has been completed; if so, the process jumps to step 306, if not, the process enters step 302. In step 302, the number of bits of the target coding block is calculated, and after completion, it enters step 303. In step 303, it is determined whether the data input to the memory is sufficient; if so, the process enters step 313; if not, the process returns to step 301. In step 313, it will be determined whether this process processes the decoding of the common field for the first time, wherein step 313 will check whether the previous common field decoding result is temporarily stored in the system; if this process processes the decoding of the common field for the first time (that is, the previous common field decoding result is not temporarily stored in the system), this means that the subsequent steps cannot use and refer to the previous common field decoding result, and the process will enter steps 304 and 305. On the other hand, if this process is not the first time to process the decoding of the common field (ie, the previous common field decoding result has been temporarily stored in the system), the process proceeds to step 306 .

[0018] In step 304, a CRC check is performed on the first coding block of the content of the common field (through the CRC bits in the first coding block). In step 305, a CRC check is performed on the second coding block of the content of the common field (through the CRC bits in the second coding block). In this embodiment, the content channel includes two coding blocks. Only when both the first coding block and the second coding block have completed the CRC check, the process will enter 306. In step 306, it is determined whether all coding blocks have completed the check; if so, the process enters 307, if not, the process returns to step 301.

[0019] When the process enters step 307, it means entering the repeatability judgment stage. First, the format description of the common field of EHT-SIG in the U-SIG field of the current data unit is compared with the format description of the common field of EHT-SIG in the U-SIG field of the previous data unit (wherein the current data unit and the previous data unit can be downlink EHT PPDU, or downlink HE MU PPDU). Among them, the format description of the common field of the EHT-SIG field (or HE-SIG-B field) of the current data unit and the previous data unit is obtained by respectively decoding the bits in the U-SIG field (or HE-SIG-A field) of the current data unit and the previous data unit. If the format descriptions are the same, the process enters step 308, if they are different, the process enters 312. Furthermore, step 307 checks the number of content channels of the EHT-SIG field (or HE-SIG-B field) of the current data unit and the previous data unit, and checks the number of bits of the common field of the EHT-SIG field (or HE-SIG-B field) of the current data unit and the previous data unit to determine whether the format description is consistent.

[0020] If these format descriptions are consistent, the process proceeds to step 308 to further compare the content consistency of the common field of the EHT-SIG field (or HE-SIG-B field) of the current data unit with the common field of the EHT-SIG field (or HE-SIG-B field) of the previous data unit. If the format description of the common field of the EHT-SIG field (or HE-SIG-B field) in the U-SIG field (or HE-SIG-A field) indicates that the format description of the common field of the EHT-SIG field (or HE-SIG-B field) of the two data units is inconsistent, the process proceeds to step 312.

[0021] In step 308, the content of the common field of the EHT-SIG field (or HE-SIG-B field) of the current data unit is compared bit by bit with the content of the common field of the EHT-SIG field (or HE-SIG-B field) of the previous data unit. Among them, step 308 compares the common bits and CRC bits in the common fields of the EHT-SIG field (or HE-SIG-B field) of the current data unit and the previous data unit. Only when all bits are consistent, the comparison result is considered consistent. If the comparison result is consistent, the process skips the RU allocation parsing stage and directly completes the common field decoding; if the comparison result is inconsistent, the process enters step 312. If the process skips the RU allocation parsing stage and directly completes the common field decoding after step 308, this means that the station will continue to use the decoding result of the EHT-SIG field (or HE-SIG-B field) of the previous data unit to obtain resource allocation information, and parse the user-specific field corresponding to the station in the EHT-SIG field (or HE-SIG-B field) of the current data unit accordingly.

[0022] If in step 307 or step 308, the process enters step 312 due to inconsistent comparison results. Then in step 312, the CRC bits in the common field of the EHT-SIG field (or HE-SIG-B field) will be checked by checking the CRC bits in the common field of the EHT-SIG field (or HE-SIG-B field) to perform a CRC check on the common bits of the common field of the EHT-SIG field (or HE-SIG-B field). If the CRC check is passed, the process enters step 309; if the CRC check is not passed, the process returns to step 301. Since the common bits in the common field of the EHT-SIG field (or HE-SIG-B field) of the previous data unit have passed the CRC check, if the comparison result of step 308 is consistent, it means that the common bits in the common field of the EHT-SIG field (or HE-SIG-B field) of the current data unit will inevitably pass the CRC check. Therefore, only when the comparison results of step 307 and step 308 are inconsistent, further CRC check is required. In this way, the time for CRC check for each data unit can be saved.

[0023] When the process enters step 309, it enters the RU allocation parsing stage. First, the RU index (RU index) is queried to determine whether the RU allocation currently given by the access point belongs to a single RU type or a multiple RU (Multi-RU, MRU) type, that is, whether the station is allocated multiple RUs. In addition, the RU index further defines the size of each RU (the number of subcarriers included) and the position in the channel (the frequency band occupied). Further, in step 309, the common field of the EHT-SIG field (or HE-SIG-B field) is decoded according to the format description of the common field of the EHT-SIG field (or HE-SIG-B field) to obtain resource allocation information including the RU index. In addition, through the RU index, it is further determined whether the RU allocation currently given by the access point belongs to a single RU type or a multiple RU type. In other words, in step 309, since the common bits of the common field of the EHT-SIG field (or HE-SIG-B field) of the previous data unit and the current data unit are inconsistent (learned by step 308), or the format description of the common field is inconsistent (learned by step 307), it is necessary to decode the common bits of the common field of the EHT-SIG field (or HE-SIG-B field) of the current data unit in step 309.

[0024] Based on this result, the process enters step 310 for single RU parsing, or enters step 311 for multiple RU parsing. In steps 310 and 311, the resource allocation information corresponding to the current data unit is used to parse the specific user-specific field corresponding to the station in the EHT-SIG field (or HE-SIG-B field) of the current data unit to obtain information about available RUs in the channel, and the station is set accordingly. After step 310 or 311 is completed, the common field decoding is completed. That is, when the process enters step 309, the decoding result of the common field of the EHT-SIG column (or HE-SIG-B field) of the current data unit is used to obtain resource allocation information, and then the station is set to parse the user-specific field and obtain information from the corresponding resource unit. From the above, it can be seen that the characteristic of this case is that when the content of the common field in the EHT-SIG field (or HE-SIG-B field) of the current data unit is consistent with the content of the common field in the EHT-SIG field (or HE-SIG-B field) of the previous data unit, the RU allocation parsing stage is omitted, and the RU allocation information obtained from the previous data unit is directly used to set up the station for subsequent data processing.

[0025] Based on the above, Figure 4 The method for obtaining resource unit allocation information in an embodiment of the present invention is shown. As shown in the figure, the method includes the following simplified process:

[0026] Step 410: Receive a first data unit from an access point of the wireless communication system, and obtain resource allocation information corresponding to the first data unit, and obtain a format description of a common field in a first signal field of the first data unit;

[0027] Step 420: Receive a second data unit, and obtain a format description of a common field in a first signal field of the second data unit;

[0028] Step 430: When the format descriptions of the common field in the first signal field of the first data unit and the second data unit are consistent, compare a plurality of bits of the common field in the first signal field of the second data unit with a plurality of bits of the common field in the first signal field of the first data unit; and

[0029] Step 440: When the multiple bits of the common field in the first signal field of the first data unit and the second data unit are consistent, use the resource allocation information corresponding to the first data unit to parse the user-specific field corresponding to the station in the first signal field of the second data unit, and set the station accordingly.

[0030] Since the principles and specific details of the above steps have been described in detail in the previous embodiments, they will not be repeated here. It should be noted that the above process can be further improved by adding other additional steps or making appropriate modifications and adjustments to achieve better communication between the access point and the station and data transmission efficiency.

[0031] Figure 5The architecture diagram of the device for executing the method of the present invention is shown. As shown in the figure, the device 500 includes a processor 510, a memory 520, a hardware decoder 530 and a storage unit 540. Among them, the device 500 can be set in a station and used to process the EHT PPDU or HE MU PPDU received by the station. The storage unit 540 is a non-volatile storage device that can be used to store program code and important information. The processor 510 can be used to execute the program code to implement the method of obtaining resource allocation information of the present invention. The hardware decoder 530 can be a Viterbi decoder or other decoder to decode the contents of the U-SIG field and the EHT-SIG field of the EHT PPDU, or to decode the contents of the HE-SIG-A field and the HE-SIG-B field of the HE MU PPDU, and store the decoding results in the memory 520. Further, in the aforementioned method, it is necessary to compare the format description of the common field of the U-SIG field (or HE-SIG-A field) of the previous data unit and the current data unit, and to compare the content of the common field of the previous data unit and the current data unit. The memory 520 can save the format description of the common field of the U-SIG field (or HE-SIG-A field) of the previous data unit, and store the content of the common field of the previous data unit for subsequent data units to compare. The processor 510 can be used to decode the output result produced by the hardware decoder 530 and perform resource allocation calculations.

[0032] In summary, the present invention provides a content duplication check mechanism for common fields, and when the content of the common fields of the previous and next data units is consistent, the decoding process of the common fields of the current data unit is omitted. The method of the present invention is particularly effective when the access point adopts a static wireless resource allocation strategy. Under the static wireless resource allocation strategy, the access point divides the bandwidth equally among each station. At this time, the resource unit allocation is not easy to change, which also means that the content of the common field is often consistent. In this case, the processor in the station can start decoding the user-specific field earlier, and can enter the Wait For Interrupt state in advance. In this way, the processor has more time to stay in the power saving mode to save the station power consumption, or to perform some low-priority tasks, thereby optimizing the station performance.

[0033] The embodiments of the present invention may be implemented using hardware, software, firmware, and combinations thereof. By using an appropriate instruction execution system, the embodiments of the present invention may be implemented using software or firmware stored in a memory and a corresponding instruction execution processor. As for hardware, any of the following technologies or combinations thereof may be applied: individual operation logic having logic gates that can perform logic functions according to data signals, application specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), or field programmable gate arrays (FPGAs), etc.

[0034] The processes and frames in the flowcharts in the specification illustrate the architecture, functions and operations that can be implemented by the systems, methods and computer software products based on various embodiments of the present invention. In this regard, each frame in the flowchart or functional block diagram can represent a module, segment or part of the program code, which includes one or more executable instructions for implementing the specified logical function. In addition, each frame in the functional block diagram and / or flowchart, and the combination of frames, can be basically implemented by a dedicated hardware system that performs a specified function or action, or can be implemented by a combination of dedicated hardware and computer program instructions. These computer program instructions can also be stored in a computer-readable medium, which can enable a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable medium implement the functions / actions specified by the frames in the flowchart and / or functional block diagram.

[0035] The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made according to the scope of the patent application of the present invention should fall within the scope of the present invention.

[0036]

Explanation of symbols

[0037] Steps 301-311, 410-440

[0038] 510 processor

[0039] 520 Memory

[0040] 530 Hardware Decoder

[0041] 540 storage units

Claims

1. A device for a station of a wireless communication system, comprising: A storage unit for storing information and program codes; as well as A processor is used to execute the program code to perform the following operations: Receiving a first data unit from an access point of the wireless communication system, and obtaining resource allocation information corresponding to the first data unit, and obtaining a format description of a common field in a first signal field of the first data unit; receiving a second data unit, and obtaining a format description of a common field in a first signal field of the second data unit; When the format descriptions of the common field in the first signal field of the first data unit and the second data unit are consistent, comparing a plurality of bits of the common field in the first signal field of the second data unit with a plurality of bits of the common field in the first signal field of the first data unit; as well as When the multiple bits of the common field in the first signal field of the first data unit and the second data unit are consistent, the resource allocation information corresponding to the first data unit is used to parse the user specific field corresponding to the station in the first signal field of the second data unit, and the station is set accordingly.

2. The apparatus of claim 1 , wherein the processor executes the program code to perform the following operations: When the multiple bits of the common field in the first signal field of the first data unit and the second data unit are inconsistent, decoding the multiple bits of the common field in the first signal field in the second data unit to obtain resource allocation information corresponding to the second data unit; and The resource allocation information corresponding to the second data unit is used to parse the user specific field corresponding to the station in the first signal field of the second data unit, and the station is configured accordingly.

3. The apparatus of claim 1 , wherein the processor executes the program code to perform the following operations: When the format descriptions of the common field in the first signal field of the first data unit and the second data unit are inconsistent, decoding the multiple bits of the common field in the first signal field in the second data unit to obtain resource allocation information corresponding to the second data unit; and The resource allocation information corresponding to the second data unit is used to parse the user specific field corresponding to the station in the first signal field of the second data unit, and the station is configured accordingly.

4. The apparatus of claim 1 , wherein the processor executes the program code to perform the following operations: decoding bits of the second signal field in the first data unit to obtain the format description of the common field in the first signal field of the first data unit; and The bits of the second signal field in the second data unit are decoded to obtain the format description of the common field in the first signal field of the second data unit. 5 . The apparatus of claim 4 , wherein the first signal field is a high-efficiency signal B field or a very high throughput signal field; and the second signal field is a high-efficiency signal A field or a general signal field.

6. The method of claim 1, wherein the format description of the common field in the first signal field of the first data unit and the second data unit comprises: The number of bits of the common field and the number of content channels of the first signal field.

7. The apparatus of claim 1 , wherein the processor executes the program code to perform the following operations: The common bits and cyclic redundancy check bits in the common field in the first signal field of the second data unit are compared to see whether they are completely consistent with the common bits and cyclic redundancy check bits in the common field in the first signal field of the first data unit.

8. The apparatus as claimed in claim 1, wherein the resource allocation information corresponding to the first data unit and the second data unit at least indicates information related to resource unit allocation.

9. The apparatus of claim 1, wherein the first data unit and the second data unit are downlink high-efficiency multi-user physical layer protocol data units, or downlink very high throughput physical layer protocol data units.

10. A method for a station in a wireless communication system to obtain resource unit allocation information, comprising: Receiving a first data unit from an access point of the wireless communication system, and obtaining resource allocation information corresponding to the first data unit, and obtaining a format description of a common field in a first signal field of the first data unit; receiving a second data unit, and obtaining a format description of a common field in a first signal field of the second data unit; When the format descriptions of the common field in the first signal field of the first data unit and the second data unit are consistent, comparing a plurality of bits of the common field in the first signal field of the second data unit with a plurality of bits of the common field in the first signal field of the first data unit; as well as When the multiple bits of the common field in the first signal field of the first data unit and the second data unit are consistent, the resource allocation information corresponding to the first data unit is used to parse the user specific field corresponding to the station in the first signal field of the second data unit, and the station is set accordingly.

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