Frame structure for selecting bridge device in high-speed wireless personal area network and method of selecting bridge device therein
First Claim
1. A frame structure for selecting a bridge device in a high-speed wireless personal area network (WPAN) which includes a parent piconet designated in advance and having a plurality of devices, a newly designated child piconet using time slots allocated from the devices located in the parent piconet, and a bridge device which is located in the child piconet, broadcasts information about the devices of the parent piconet and information about the devices of the child piconet to the devices included in the high-speed WPAN, and operates to perform a data transfer between a first specific device included in the child piconet and a second specific device included in the parent piconet, the frame structure providing a media access control (MAC) frame which includes an overall capability field, composed of 9 bytes, for indicating an overall capability of a specific device, a length field, composed of one byte, for indicating a length of a frame, and an element identifier (ID) field for identifying respective elements;
- wherein the overall capability field includes a device capability field for indicating a capability of the specific device, a piconet coordinator capability field for indicating a capability for determining whether the specific device can be a piconet coordinator (PNC), and a bridge capability field for indicating a capability for determining whether the specific device can be the bridge device.
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Abstract
A method and system is disclosed that can support communications among devices contained in different piconets in a high-speed Wireless Personal Area Network. The high-speed WPAN includes a parent piconet, a newly designated child piconet using time slots allocated among devices in the parent piconet, and a bridge device which is located in the child piconet, that broadcasts information about the devices of the parent piconet and the child piconet to the devices included in the high-speed WPAN, and operates to perform a data transfer between a device in the child piconet and a device in the parent piconet. A media access control (MAC) frame structure that includes an overall capability field for indicating an overall capability of a specific device, a length field for indicating a length of a frame, and an element identifier (ID) field for identifying respective elements is used by the bridge device to facilitate communications. The overall capability field includes a device capability field for indicating a capability of the specific device, a piconet coordinator capability field for indicating a capability for determining whether the specific device can be a piconet coordinator (PNC), and a bridge capability field for indicating a capability for determining whether the specific device can be the bridge device. Criteria for establishing the bridge device are also disclosed.
63 Citations
22 Claims
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1. A frame structure for selecting a bridge device in a high-speed wireless personal area network (WPAN) which includes a parent piconet designated in advance and having a plurality of devices, a newly designated child piconet using time slots allocated from the devices located in the parent piconet, and a bridge device which is located in the child piconet, broadcasts information about the devices of the parent piconet and information about the devices of the child piconet to the devices included in the high-speed WPAN, and operates to perform a data transfer between a first specific device included in the child piconet and a second specific device included in the parent piconet, the frame structure providing a media access control (MAC) frame which includes an overall capability field, composed of 9 bytes, for indicating an overall capability of a specific device, a length field, composed of one byte, for indicating a length of a frame, and an element identifier (ID) field for identifying respective elements;
wherein the overall capability field includes a device capability field for indicating a capability of the specific device, a piconet coordinator capability field for indicating a capability for determining whether the specific device can be a piconet coordinator (PNC), and a bridge capability field for indicating a capability for determining whether the specific device can be the bridge device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for selecting a bridge device in a high-speed wireless personal area network (WPAN) which includes a parent piconet designated in advance and having a plurality of devices, a newly designated child piconet using time slots allocated from the devices located in the parent piconet, and a bridge device which is located in the child piconet, that broadcasts information about the devices of the parent piconet and information about the devices of the child piconet to the devices included in the high-speed WPAN, and operates to perform a data transfer between a first specific device included in the child piconet and a second specific device included in the parent piconet, the method comprising the steps of:
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1. detecting devices that can operate as the bridge device;
2. selecting a device as the bridge device while comparing sizes of buffers of the detected devices, which have physically been determined, if plural devices which can operate as the bridge device are detected;
3. selecting the device having the largest buffer size as a result of comparison at the second step as the bridge device, and if there are plural devices having the same largest buffer size, selecting a piconet coordinator among the devices having the same largest buffer size as the bridge device;
4. selecting the device whose security bit is activated as the bridge device if there is no piconet coordinator among the devices having the same largest buffer size;
5. a selecting the device having a power source as the bridge device if there are plural devices whose security bits are activated, or if there is no device whose security bit is activated at the fourth step;
6. selecting the device having a large number of associated devices as the bridge device if there are plural devices having the power source, or if there is no device having the power source at the fifth step;
7. selecting the device having a large output power if there are plural devices having a large number of associated devices at the sixth step; and
8. selecting the device having a high transmission speed as the bridge device if there are plural devices having the large output power, or if there is no device having the large output power at the seventh step.
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11. A system for selecting a bridge device in a high-speed wireless personal area network (WPAN) comprising a parent piconet having a plurality of devices, and a designated child piconet wherein time slots allocated are used for communication among devices located in the parent piconet, that operates to perform a data transfer between a one device included in the child piconet and a another device included in the parent piconet, the system comprising:
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a memory;
a processor in communication with the memory, for executing code for;
determining at least one device within the child piconet that can operate as the bridge device;
selecting a device as the bridge device based on the criteria;
selecting the device having the largest buffer size;
selecting a piconet coordinator among the devices having the same largest buffer size;
selecting the device whose security bit is activated if there is no piconet coordinator among the devices having the same largest buffer size;
selecting the device having a power source if there are a plurality of devices whose security bits are activated, or if there is no device whose security bit is activated;
selecting the device having a large number of associated devices as the bridge device if there are a plurality of devices having the power source, or if there is no device having the power source;
selecting the device having a large output power if there are a plurality of devices having a large number of associated devices; and
selecting the device having a high transmission speed as the bridge device if there are a plurality of devices having the large output power, or if there is no device having the large output power. - View Dependent Claims (12, 13, 14)
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15. In a wireless communication network containing devices organized in parent networks and sub-networks, wherein a device in the parent network operates additionally a controlling device for a corresponding sub-network, a method for determining a bridging device from devices in the sub-network for allowing direct communication between devices in the parent network and the sub-network, the method comprising the steps of:
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determining at least one device within the sub-network that can operate as the bridge device;
selecting a device operable as the bridge device based on the criteria selected from the group consisting of;
buffer size, operation as a sub-network coordinator, activated security bit, power source, and number of associated devices, output power; and
transmission speed. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22)
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Specification