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US-20260128934-A1 - RECEPTION APPARATUS AND METHOD FOR RECEIVING A CONTROL SIGNAL IN A WIRELESS COMMUNICATION SYSTEM

US20260128934A1US 20260128934 A1US20260128934 A1US 20260128934A1US-20260128934-A1

Abstract

A transmission apparatus includes control circuitry and a transmitter. The control circuitry, in operation, generates a signal that includes a legacy preamble, a non-legacy preamble and a data field, wherein the non-legacy preamble comprises a first non-legacy signal field and a second non-legacy signal field, wherein the first non-legacy signal field comprises a 3-bit signaling that is composed of a 1-bit first subfield and a 2-bit second subfield, and a certain value of the 3-bit signaling indicates presence of a Resource Unit (RU) allocation subfield in the second non-legacy signal field. The transmitter, in operation, transmits the signal.

Inventors

  • Lei Huang
  • Yoshio Urabe
  • MICHAEL HONG CHENG SIM

Assignees

  • PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.

Dates

Publication Date
20260507
Application Date
20251216
Priority Date
20160106

Claims (12)

  1. 1 . A transmission apparatus comprising: control circuitry which, in operation, generates a signal that includes a legacy preamble, a non-legacy preamble and a data field, wherein the non-legacy preamble comprises a first non-legacy signal field and a second non-legacy signal field, wherein the first non-legacy signal field comprises a 3-bit signaling that is composed of a 1-bit first subfield and a 2-bit second subfield, and a certain value of the 3-bit signaling indicates presence of a Resource Unit (RU) allocation subfield in the second non-legacy signal field; and a transmitter which, in operation, transmits the signal.
  2. 2 . The transmission apparatus according to claim 1 , wherein the second non-legacy signal field comprises a first channel field that corresponds to a first frequency subband and a second channel field that corresponds to a second frequency subband different from the first frequency subband; and when the 3-bit signaling indicates that a full bandwidth is allocated for Multi User Multiple Input Multiple Output (MU-MIMO) transmission, a plurality of user-specific subfields are split equally between the first channel field and the second channel field.
  3. 3 . The transmission apparatus according to claim 2 , wherein each of the first channel field and the second channel field comprises a user-specific field that includes multiple user-specific subfields, each user-specific subfield carrying information for a corresponding terminal station.
  4. 4 . The transmission apparatus according to claim 2 , wherein when the 3-bit signaling indicates that full bandwidth is allocated for MU-MIMO transmission, a common field that carries the RU allocation subfield is not present in each of the first channel field and the second channel field.
  5. 5 . The transmission apparatus according to claim 2 , wherein each of the first channel field and the second channel field includes a common field that carries the RU allocation subfield in a case other than that full bandwidth is allocated for MU-MIMO transmission.
  6. 6 . The transmission apparatus according to claim 2 , wherein when the 3-bit signaling indicates that the full bandwidth is allocated for the MU-MIMO transmission, the common field that carries the RU allocation subfield is not present in each of the first channel field and the second channel field; and otherwise, each of the first channel field and the second channel field in the second non-legacy signal field includes a common field that carries RU allocation subfield.
  7. 7 . A transmission method comprising: generating a signal that includes a legacy preamble, a non-legacy preamble and a data field, wherein the non-legacy preamble comprises a first non-legacy signal field and a second non-legacy signal field, wherein the first non-legacy signal field comprises a 3-bit signaling that is composed of a 1-bit first subfield and a 2-bit second subfield, and a certain value of the 3-bit signaling indicates presence of a Resource Unit (RU) allocation subfield in the second non-legacy signal field; and transmitting the signal.
  8. 8 . The transmission method according to claim 7 , wherein the second non-legacy signal field comprises a first channel field that corresponds to a first frequency subband and a second channel field that corresponds to a second frequency subband different from the first frequency subband; and when the 3-bit signaling indicates that full bandwidth is allocated for Multi User Multiple Input Multiple Output (MU-MIMO) transmission, a plurality of user-specific subfields are split equitably between the first channel field and the second channel field.
  9. 9 . The transmission method according to claim 8 , wherein each of the first channel field and the second channel field comprises a user-specific field that includes multiple user-specific subfields, each user-specific subfield carrying information for a corresponding terminal station.
  10. 10 . The transmission method according to claim 8 , wherein when the 3-bit signaling indicates that full bandwidth is allocated for MU-MIMO transmission, a common field that carries the RU allocation subfield is not present in each of the first channel field and the second channel field.
  11. 11 . The transmission method according to claim 8 , wherein each of the first channel field and the second channel field includes a common field that carries the RU allocation subfield in a case other than that full bandwidth is allocated for MU-MIMO transmission.
  12. 12 . The transmission method according to claim 8 , wherein when the 3-bit signaling indicates that the full bandwidth is allocated for the MU-MIMO transmission, the common field that carries the RU allocation subfield is not present in each of the first channel field and the second channel field; and otherwise, each of the first channel field and the second channel field in the second non-legacy signal field includes a common field that carries RU allocation subfield.

Description

BACKGROUND Technical Field The present disclosure generally pertains to wireless communications and, more particularly, to a method for formatting and receiving control signaling in a wireless communications system. Description of the Related Art The IEEE (Institute of Electrical and Electronics Engineers) 802.11 Working Group is developing 802.11ax HE (High Efficiency) WLAN (Wireless Local Area Network) air interface in order to achieve a very substantial increase in the real-world throughput achieved by users in high density scenarios. OFDMA (Orthogonal Frequency Division Multiple Access) multiuser transmission has been envisioned as one of the most important features in 802.11ax. OFDMA is a multiple access scheme that performs multiple operations of data streams to and from the plurality of users over the time and frequency resources of the OFDM system. Studies are underway to perform frequency scheduling for OFDMA multiuser transmission in 802.11ax. According to frequency scheduling, a radio communication access point apparatus (hereinafter simply “access point” or “AP”) adaptively assigns subcarriers to a plurality of radio communication station apparatuses (hereinafter simply “terminal stations” or “STAs”) based on reception qualities of frequency bands of the STAs. This makes it possible to obtain a maximum multiuser diversity effect and to perform communication quite efficiently. Frequency scheduling is generally performed based on a Resource Unit (RU). A RU comprises a plurality of consecutive subcarriers. The RUs are assigned by an AP to each of a plurality of STAs with which the AP communicates. The resource assignment result of frequency scheduling performed by the AP shall be reported to the STAs as resource assignment information. In addition, the AP shall also report other control signaling such as common control information and per-user allocation information to STAs. CITATION LIST Non Patent Literature NPL 1IEEE802.11-15/0132r9, Specification Framework for TGax, September 2015NPL 2IEEE802.11-15/1066r0, HE-SIG-B Contents, September 2015NPL 3IEEE Std 802.11ac-2013NPL 4IEEE802.11-15/0132r15, Specification Framework for TGax, January 2016NPL 5IEEE802.11-16/0024r0, Proposed TGax Draft Specification, January 2016 BRIEF SUMMARY As flexibility in frequency scheduling increases, more signaling bits are needed to report control signaling (i.e., common control information, resource assignment information and per-user allocation information) to STAs. This results in an increase of the overhead for reporting control signaling. So there is a relationship of trade-off between flexibility in frequency scheduling and overhead for reporting control signaling. A challenge is how to achieve flexible frequency scheduling while reducing an increase of the overhead for reporting the control signaling. In one general aspect, the techniques disclosed here feature: a receoption apparatus of the present disclosure comprising a receiver which, in operation, receives a signal that includes a legacy preamble, a non-legacy preamble and a data field, wherein the non-legacy preamble comprises a first non-legacy signal field and a second non-legacy signal field, wherein the first non-legacy signal field comprises a 3-bit signaling that is composed of a 1-bit first subfield and a 2-bit second subfield, and a certain value of the 3-bit signaling indicates presence of a Resource Unit (RU) allocation subfield in the second non-legacy signal field; and a processor which, in operation, decodes the signal. It should be noted that general or specific disclosures may be implemented as a system, a method, an integrated circuit, a computer program, a storage medium, or any selective combination thereof. With the reception apparatus and reception method of the present disclosure, it is possible to facilitate flexible frequency scheduling while suppressing an increase of the overhead for reporting the control signaling. Additional benefits and advantages of the disclosed embodiments will become apparent from the specification and drawings. The benefits and/or advantages may be individually obtained by the various embodiments and features of the specification and drawings, which need not all be provided in order to obtain one or more of such benefits and/or advantages. BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS FIG. 1 shows a diagram illustrating the format of an HE packet complying with the IEEE 802.11ax specification framework document. FIG. 2 shows a diagram illustrating an example OFDMA structure of the HE data field of the HE packet in case of CBW=40 MHz. FIG. 3 shows a diagram illustrating an example structure of the HE-SIG-B of the HE packet in case of CBW=40 MHz. FIG. 4 shows a diagram illustrating an example format of the HE-SIG-B of the HE packet in case of CBW=40 MHz. FIG. 5 shows a diagram illustrating another example format of the HE-SIG-B of the HE packet in case of CBW=40 MHz. FIG. 6 shows a diagram illustratin