SHORT PACKET OPTIMIZATION IN WLAN SYSTEMS

• US 20190313284A1
• Filed: 06/24/2019
• Published: 10/10/2019
• Est. Priority Date: 03/06/2015
• Status: Active Grant

• Current Assignee: InterDigital Patent Holdings, Inc. (InterDigital, Inc.)
• Original Assignee: InterDigital Patent Holdings, Inc. (InterDigital, Inc.)
• Inventors: Xi, Fengjun, Lou, Hanqing, Oteri, Oghenekome, Shah, Nirav B., Olesen, Robert L., Jin, Yuan Sheng, Xia, Pengfei, La Sita, Frank, Zhang, Guodong
• Granted Patent: US 11,405,820 B2
• Time in Patent Office: Days
• CPC Class Codes: H04B 7/0404 the mobile station comprising multiple antennas, e.g. to provide uplink diversity
• CPC Class Codes: H04B 7/0452 Multi-user MIMO systems
• CPC Class Codes: H04L 1/1614 using bitmaps
• CPC Class Codes: H04L 1/1621 Group acknowledgement, i.e. the acknowledgement message defining a range of identifiers, e.g. of sequence numbers
• CPC Class Codes: H04L 1/1854 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 1/1861 Physical mapping arrangements for ACK signaling see also H04L5/0053
• CPC Class Codes: H04L 1/1864 ARQ related signaling H04L1/1607 takes precedence
• CPC Class Codes: H04L 2001/0093 Point-to-multipoint
• CPC Class Codes: H04L 25/0204 of multiple channels
• CPC Class Codes: H04L 27/2602 Signal structure
• CPC Class Codes: H04L 27/2603 Signal structure ensuring backward compatibility with legacy system
• CPC Class Codes: H04L 27/26035 Maintenance of orthogonality, e.g. for signals exchanged between cells or users, or by using covering codes or sequences using different training sequence per antenna H04B7/0684; code allocation H04J13/16
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0026 Division using four or more dimensions
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0055 Physical resource allocation for ACK/NACK for physical mapping arrangements in ARQ protocols H04L1/1861
• CPC Class Codes: H04L 5/0082 at predetermined intervals
• CPC Class Codes: H04L 5/0091 Signaling for the administration of the divided path
• CPC Class Codes: H04W 28/04 Error control
• CPC Class Codes: H04W 28/06 Optimizing the usage of the radio link, e.g. header compression, information sizing , discarding information system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365
• CPC Class Codes: H04W 72/121 : for groups of terminals or users
• CPC Class Codes: H04W 72/21 : in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 84/12 : WLAN [Wireless Local Area Networks]

Abstract

Mechanisms may be used for aggregating acknowledgement (ACK), block ACK (BA) and/or short packets transmissions for multi-user (MU) wireless communication systems. Aggregation mechanisms may be used for uplink (UL) and/or downlink (DL) orthogonal frequency division multiple access (OFDMA), and/or UL/DL multiple-user multiple input multiple output (MU-MIMO) transmissions, for example. Multi-user short packets may be aggregated and/or simultaneously transmitted for DL, UL, or peer-to-peer (P2P) transmissions.

Claims

1. A wireless transmit/receive unit (WTRU) configured for multi-user (MU) communications, the WTRU comprising:

a receiver configured to receive a downlink (DL) data frame containing control information, wherein the control information includes uplink (UL) MU response scheduling information for a group of WTRUs;

the receiver configured to receive a DL control frame indicating at least the group of WTRUs for simultaneous transmission of acknowledgments (ACKs) or block ACKs (BAs); and

a transmitter configured to transmit an ACK or BA simultaneously with transmission of ACKs or BAs from the group of WTRUs over a plurality of respective resource units as part of a MU transmission.

2. The WTRU of claim 1, wherein short interframe spacing (SIFS) exists between the receiver receiving the DL control frame and the transmitter transmitting the ACK or BA.

3. The WTRU of claim 1, wherein:

the receiver is further configured to receive a DL MU transmission, wherein the DL MU transmission is one of DL MU multi-input-multi-output (MIMO) transmission or DL orthogonal frequency division multiple access (OFDMA) transmission.

4. The WTRU of claim 1, wherein the receiver is configured to receive the DL control frame over an entire channel bandwidth.

5. The WTRU of claim 1, wherein the DL control frame includes at least one of the following information:

a number of WTRUs scheduled to feedback an acknowledgment, an indication of the group of WTRUs scheduled to feedback an acknowledgment, a resource unit indication for each WTRU for the feedback of the ACKs or BAs, block acknowledgment request (BAR) control and BAR information for each scheduled WTRU, or indication regarding permissible aggregation of ACKs or BAs and other packets.

6. The WTRU of claim 1, wherein:

the receiver is further configured to receive a data physical layer convergence protocol (PLCP) protocol data unit (PPDU), wherein the ACK or BA acknowledges the data PPDU.

7. The WTRU of claim 6, wherein the data PPDU is transmitted as part of a plurality of data PPDUs that are transmitted simultaneously over the plurality of respective resource units.

8. A method, performed by a wireless transmit/receive unit (WTRU), for multi-user (MU) communications in a wireless local area network (WLAN) system, the method comprising:

receiving a downlink (DL) data frame containing control information, wherein the control information includes uplink (UL) MU response scheduling information for a group of WTRUs;

receiving a DL control frame indicating at least the group of WTRUs for simultaneous transmission of acknowledgments (ACKs) or block ACKs (BAs); and

transmitting an ACK or BA simultaneously with the group of WTRUs over a plurality of respective resource units as part of a MU transmission.

9. The method of claim 8, wherein short interframe spacing (SIFS) is used in between the receiving the DL control frame and the transmitting the ACK or BA.

10. The method of claim 8, further comprising:

receiving a DL MU transmission, wherein the DL MU transmission is one of DL MU multi-input-multi-output (MIMO) transmission or DL orthogonal frequency division multiple access (OFDMA) transmission.

11. The method of claim 8, wherein the receiving the DL control frame is over an entire channel bandwidth.

12. The method of claim 8, wherein the DL control frame includes at least one of the following information:

a number of WTRUs scheduled to feedback an acknowledgment, an indication of the group of WTRUs scheduled to feedback an acknowledgment, a resource unit indication for each WTRU for the feedback of the ACKs or BAs, block acknowledgment request (BAR) control and BAR information for each scheduled WTRU, or indication regarding permissible aggregation of ACKs or BAs and other packets.

13. The method of claim 8, further comprising:

receiving a data physical layer convergence protocol (PLCP) protocol data units (PPDU), wherein the ACK or BA acknowledges the data PPDU.

14. The method of claim 13, wherein the data PPDU is transmitted as part of a plurality of data PPDUs that are transmitted simultaneously over the plurality of respective resource units.