Role Switching Method Performed in Dual Role Device, and the Dual Role Device

A dual role device (DRD) comprising:

• a processor;
• and
• a program storage device readable by the DRD, embodying a program of instructions executable by the processor to perform method steps for switching the DRD between the roles of a host and a device, the method comprising:
• receiving, by the DRD, a command from a device DRD that requests a role switch;
• consecutively transmitting, by the DRD, M micro-scheduled management commands (MMCs) to the device DRD when the DRD accepts the role switch request command, wherein M is a positive integer,
• wherein the DRD switches to a role of a device DRD upon accepting the role switch request command, and
• wherein the role switch request command includes a superframe comprising a first indicator from an external device DRD via a MAC/PHY block when the external device DRD wants to switch to a host role, and transmits a second superframe comprising a second indicator, the second indicator having values identical to or different from a value of an indicator previously transmitted to the external device DRD, to the external device DRD via the MAC/PHY block in response to the received first indicator.