Apparatus for allocating transmission period in a wireless communication system

• US 20070115972A1
• Filed: 10/17/2006
• Published: 05/24/2007
• Est. Priority Date: 10/18/2005
• Status: Active Grant

• Current Assignee: Sisvel International S.A. (Fineur International S.A.)
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Jang, Kyung-Hun, Lee, Dong-Jun, Hwang, Hyo-Sun, Kim, Young-Soo, Park, Jong-Ae
• Granted Patent: US 7,701,889 B2
• Time in Patent Office: Days
• US Class Current: 370/389
• CPC Class Codes: H04B 7/2656 for structure of frame, burst
• CPC Class Codes: H04L 1/0007 by modifying the frame length
• CPC Class Codes: H04L 1/0025 Transmission of mode-switching indication
• CPC Class Codes: H04L 1/1614 using bitmaps
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04L 1/1854 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 1/1887 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 47/10 Flow control; Congestion control
• CPC Class Codes: H04L 47/26 using explicit feedback to the source, e.g. choke packets
• CPC Class Codes: H04L 47/33 using forward notification
• CPC Class Codes: H04L 47/365 Dynamic adaptation of the packet size
• CPC Class Codes: H04W 28/14 using intermediate storage
• CPC Class Codes: H04W 48/08 Access restriction or access information delivery, e.g. discovery data delivery signalling during connection H04W76/00
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 52/50 at the moment of starting communication in a multiple access environment
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 74/04 Scheduled access hybrid access H04W74/02
• CPC Class Codes: H04W 8/04 Registration at HLR or HSS [Home Subscriber Server]
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]
• CPC Class Codes: H04W 88/02 Terminal devices
• CPC Class Codes: H04W 88/08 : Access point devices
• CPC Class Codes: Y02D 30/70 : in wireless communication networks

Abstract

An apparatus is provided for allocating a transmission period in a wireless network system. An access point (AP) transmits a PSMP frame indicating a downlink period and an uplink period allocated to each station (STA), and at least one sub PSMP frame indicating an allocated downlink period for at least one of a retransmission of downlink data and a transmission of an ACK indicating successful receipt of uplink data. After exchanging data with the AP in the downlink and uplink periods indicated by the PSMP frame, an STA receives the each sub PSMP frame, and performs at least one of a reception of the retransmitted downlink data and a reception of the ACK in the downlink period indicated by the each sub MAP frame.

Claims

1. An access point (AP) apparatus for allocating a transmission period in a transmission frame period having a preset duration in a wireless network system in a wireless network system, the apparatus comprising:

a processor for generating a power save multi-poll (PSMP) frame providing at least one of an initial downlink period and an initial uplink period allocated to a station (STA), and generating a sub PSMP frame providing an additional period for retransmitting at least one of downlink data and uplink data; and

a transceiver for transmitting the PSMP frame to the STA, receiving data by the STA in the initial downlink period, transmitting data by the STA in the initial uplink period, and after the initial downlink period and the initial uplink period, transmitting in the transmission frame period the sub PSMP frame, and retransmitting in the transmission frame period data received in the initial downlink period.

2. The AP apparatus of claim 1, wherein the sub PSMP frame provides an additional downlink period for a transmission of an acknowledgement (ACK) indicating successful receipt of uplink data transmitted in the initial uplink period.

3. The apparatus of claim 2, wherein the ACK is transmitted in the downlink period provided by the at least one sub PSMP frame.

4. The apparatus of claim 1, wherein more than one sub PSMP frame can be transmitted within one transmission frame period.

5. The AP apparatus of claim 1, wherein the transceiver receives from the STA in the uplink period provided by the PSMP frame an ACK indicating successful receipt of data transmitted in the initial downlink period provided by the PSMP frame.

6. The AP apparatus of claim 5, wherein the ACK includes a bitmap indicating successful receipt of at least one data unit.

7. The AP apparatus of claim 1, wherein the sub PSMP frame further provides an uplink period for a retransmission of uplink data received with errors in an uplink period immediately before transmission of the corresponding sub PSMP frame.

8. The AP apparatus of claim 1, wherein the sub PSMP frame comprises:

an identifier (ID) of the STA;

a start offset indicating a start point of each period provided by the sub PSMP frame; and

a duration field indicating a length of each period provided by the sub PSMP frame.

9. The AP apparatus of claim 1, wherein all of the periods provided by the PSMP frame and all of the periods provided by the sub PSMP frame are included in one transmission frame period having a fixed length.