Apparatus for allocating transmission period in a wireless communication system

• US 20070086374A1
• Filed: 10/17/2006
• Published: 04/19/2007
• 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 7,688,768 B2
• Time in Patent Office: Days
• US Class Current: 370/328
• 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 efficiently allocating a transmission period in a wireless network system. An access point (AP) transmits a PSMP frame indicating a downlink period provided to each station (STA) and a minimum amount of an uplink period allocated to each STA, and at least one sub PSMP frame indicating an uplink period additionally provided for an STA that transmitted a resource request message for remaining queued data in the uplink period indicated by the PSMP frame. If the uplink period indicated by the PSMP frame is insufficient to transmit the queued data, the STA transmits a data unit including a part of the queued data and a resource request message for the remaining queued data in the uplink period. After transmitting the resource request message, the STA receives the sub PSMP frame after the full period indicated by the sub PSMP frame, and transmits the remaining queued data to the AP in the uplink period indicted by the sub PSMP frame.

Claims

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

a processor for generating a power save multi-poll (PSMP) frame providing a downlink period and an initial uplink period to a station (STA), and upon detecting a resource request message from at least one STA requesting allocation of additional resources required for the transmission of remaining queued uplink data and after the downlink period and the initial uplink period provided by the PSMP frame, generating a sub PSMP frame providing in the transmission frame period an additional uplink period to the at least one STA requesting allocation of additional resources sufficient to transmit at least part of the remaining queued uplink data; and

a transceiver for transmitting data to the STA in the downlink period provided by the PSMP frame and receiving data from the STA in the initial uplink period provided by the PSMP frame, and receiving in the additional uplink period provided by the sub PSMP frame the at least part of the remaining queued uplink data from the at least one STA that transmitted the resource request message.

2. The apparatus of claim 1, wherein if the additional uplink period is insufficient to transmit the remaining queued data, transmitting additional resource request messages and providing additional uplink periods until one of all of the remaining queued data is transmitted or the preset duration of the transmission frame period expires.

3. The AP apparatus of claim 1, wherein the initial uplink period is provided according to at least one of a required minimum data rate and a period required for transmission of a resource request message.

4. The AP apparatus of claim 1, wherein the resource request message includes at least one of a size field defining the amount of the remaining queued uplink data and a duration request field defining a required quality of service (QoS).

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

an identifier (ID) of the STA that transmitted the resource request message;

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

a duration field indicating a length of the additional uplink period.

6. 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.