Method and apparatus for spatial reuse by assistance of distributed devices over wireless system using directional antennas
View Patent ↗Disclosed are a method for spatial reuse by support of distributed devices in a wireless communication system using a directional antenna, and an apparatus for the same. In the wireless communication system using the directional antenna, the method arranges an antenna with respect to a target device for communication before the distributed devices request a resource for communication, informs the target device or a central control unit in advance of a measurement result of a signal in MASs through the antenna, and requests a resource and receives a resource allocation based on the measurement result.
1. A method of a source device of a wireless communication system, the method comprising:
determining information corresponding to a pre-allocated resource including an available medium access slot (MAS) using a beacon message received from an adjacent device;
transmitting, to a target device, a resource request message including the available MAS for a resource request;
receiving, from the target device, a resource request reply message, the resource request reply message including,
when the resource request is approved, a field indicating allocation information with respect to the resource request, and
when the available MAS has an interference, a field indicating interference information at the available MAS; and
communicating, with the target device, using the available MAS when the field indicating the allocation information is included in the resource request reply message.
2. The method of claim 1 , wherein the determining comprises
selecting the available MAS among a plurality of MASs for communicating between the source device and the target device, each of the plurality of MASs having a predetermined length.
3. A method of a source device of a wireless communication system, the method comprising:
determining information corresponding to a pre-allocated resource including an available medium access slot (MAS) using a beacon message received from an adjacent device;
transmitting, to a target device, a resource request message including the available MAS;
receiving, from the target device, a resource request reply message including any one of a field indicating allocation information with respect to a resource request and a field indicating interference information at the available MAS;
communicating, with the target device, using the available MAS when the field indicating the allocation information is included in the resource request reply message; and
requesting a resource from the target device by reselecting a resource to be requested using resource information of the target device included in the resource request reply message when the field indicating the interference information is included in the resource request reply message.
4. The method of claim 2 , further comprising
receiving, from the target device, a scanning result IE including channel states at the plurality of MASs; and
selecting a channel for communicating with the target device based on the scanning result IE.
5. The method of claim 4 , the scanning result IE comprises
an element identification (ID) to represent the scanning result IE;
a length field to represent a length of the scanning result IE;
a beam index to represent a directional beam used for measuring the channel states; and
measurement result information including the channel states measured by an MAS zone.
6. The method of claim 1 , the information corresponding to the pre-allocated resource includes a distributed reservation protocol (DRP) availability information element (IE).
7. A method of a target device of a wireless communication system, the method comprising:
receiving, from a source device, a resource request message including a medium access slot (MAS) requested for a resource;
identifying whether interference exists in the MAS;
generating a resource request reply message including a resource request result field based on whether the interference exists, including
setting a value of the resource request result field as a value corresponding to interference when the interference exists, and
including a resource information of the target device into the resource request reply message; and
transmitting, to the source device, the resource request reply message.