Channel time allocation method in high rate WPAN

• US 20050002362A1
• Filed: 05/05/2004
• Published: 01/06/2005
• Est. Priority Date: 05/13/2003
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kim, Yong-suk, Yoon, Won-yong
• Granted Patent: US 7,620,011 B2
• Time in Patent Office: Days
• US Class Current: 370/336
• CPC Class Codes: H04J 3/0638 Clock or time synchronisation among nodes; Internode synchronisation synchronization for ring networks H04L12/422; data switching networks with synchronous transmission H04L12/43
• CPC Class Codes: H04N 21/43615 Interfacing a Home Network, e.g. for connecting the client to a plurality of peripherals home Audio Video Interoperability [HAVI] data switching networks H04L12/2805
• CPC Class Codes: H04N 21/43637 involving a wireless protocol, e.g. Bluetooth, RF or wireless LAN [IEEE 802.11] arrangements for wireless networking or broadcasting of information in indoor or near-field type systems H04B10/114
• CPC Class Codes: H04W 56/0015 one node acting as a reference for the others
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

Disclosed is a channel time allocation method in a high rate WPAN and a wireless system using the same. In the WPAN environment synchronized by a synchronization signal broadcasted from a coordinator, the channel time allocation method includes transmitting a channel time allocation request command corresponding to a property of an application data to be transmitted to the coordinator by any one of devices linked to the WPAN, and the coordinator allocating the channel time, inserting information of the allocated channel time to the synchronization signal, and broadcasting the synchronization signal to the devices. Accordingly, the channel time is allocated to fit for the property of the VBR stream data such as the MPEG-2 video so that the QoS of the VBR stream is provided. At the same time, reliability of the transmission of I frame is enhanced so that success rate of decoding the frame is increased.

Claims

1. A channel time allocation method in a wireless network that is synchronized by a synchronization signal broadcasted from a coordinator, comprising the steps of:

transmitting a channel time allocation request command corresponding to a property of an application data to be transmitted to the coordinator by any one of devices which are linked to the wireless network; and

the coordinator allocating a channel time as an allocated channel time by referencing the channel time allocation request command, inserting information of the allocated channel time to the synchronization signal, and broadcasting the synchronization signal to the devices.

2. The method of claim 1, further comprising the step of transmitting and receiving the application data among the devices based on the information of the allocated channel time inserted to the synchronization signal.

3. The method of claim 1, wherein the wireless network is a wireless personal area network (WPAN) complying with IEEE 802.15.3x.

4. The method of claim 3, wherein, in the step of broadcasting, the channel time is allocated by adjusting a superframe cycle according to a frame cycle of the application data.

5. The method of claim 3, wherein the channel time allocation request command is generated by attaching a field as an attached field representing the property of the application data to a channel time request command.

6. The method of claim 5, wherein the application data is a variable bit rate (VBR) stream in a form of MPEG-2 video.

7. The method of claim 6, wherein the field representing the property of the application data contains at least one information of an application data type, a full length of the attached field, a cycle of the allocated channel time, a number of frames of Group of Pictures (GOP), an interval between P frames, a size of a largest I frame, a size of a largest P frame, and a size of a largest B frame.

8. The method of claim 1, wherein the devices use a layer management of the IEEE 802.15.3x and further contain a media access control layer management entity service access point (MLME SAP) to transmit the property of the application data to a MAC layer management entity (MLME).

9. The method of claim 1, wherein the wireless network is a wireless personal area network.

10. A wireless system operating in a wireless network comprising:

devices linked to the wireless network; and

a coordinator to broadcast a synchronization signal to the devices to synchronize the devices, wherein

if any one of the devices transmits a channel time allocation request command corresponding to a property of an application data to be transmitted to the coordinator, the coordinator allocates a channel time as an allocated channel time by referencing the channel time allocation request command, inserts information of the allocated channel time to the synchronization signal, and broadcasts the synchronization signal to the devices, and the devices transmit and receive the application data based on the allocated channel time.

11. The system of claim 10, wherein the wireless network is a wireless personal area network (WPAN) complying with IEEE 802.15.3x .

12. The system of claim 11, wherein the coordinator allocates the channel time by adjusting a superframe cycle according to a frame cycle of the application data.

13. The system of claim 12, wherein the channel time allocation request command is generated by attaching a field as an attached field representing the property of the application data to a channel time request command.

14. The system of claim 13, wherein the application data is a variable bit rate (VBR) stream in a form of MPEG-2 video.

15. The system of claim 14, wherein the field presenting the property of the application data contains at least one information of an application data type, a full length of the attached field, a cycle of the allocated channel time, a number of frames of Group of Pictures (GOP), an interval between P frames, a size of a largest I frame, a size of a largest P frame, and a size of a largest B frame.

16. The system of claim 10, wherein the devices use a layer management of the IEEE 802.15.3x and further contain a media access control layer management entity service access point (MLME SAP) to transmit the property of the application data to MAC layer management entity (MLME).

17. The system of claim 10, wherein the wireless network is a wireless personal area network.