Method and apparatus for radio communication with control according to priority of data to be transmitted

A radio communication apparatus for avoiding a collision between data to be transmitted and data transmitted by another radio communication apparatus, by notifying another radio communication apparatus of transmitting data by transmitting a first carrier into a predetermined time slot in a communication frame prior to the data transmission using the communication frame, and by transmitting the first carrier after a predetermined time has passed in a case where a second carrier transmitted by another radio communication apparatus is detected before transmitting the first carrier, said apparatus comprising:

• distinction means for distinguishing a priority of data to be transmitted;
• detection means for detecting said second carrier transmitted by another radio communication apparatus;
• first transmission means for transmitting said first carrier using a time slot in accordance with the priority distinguished by said distinction means, according to the detection by said detection means;
• and
• second transmission means for transmitting data after said first carrier has been transmitted by said first transmission means.

An exchange system including a main apparatus having exchanging capability and also including radio communication apparatus for avoiding a collision between data to be transmitted and data transmitted by another radio communication apparatus, by notifying another radio communication apparatus of transmitting data by transmitting a first carrier into a predetermined time slot in a communication frame prior to the data transmission using the communication frame, and by transmitting the first carrier after a predetermined time has passed in a case where a second carrier transmitted by another radio communication apparatus is detected before transmitting the first carrier, said exchange system comprising:

• distinction means for distinguishing priority of data to be transmitted;
• detection means for detecting said second carrier transmitted by another radio communication apparatus;
• first transmission means for transmitting said first carrier using a time slot in accordance with the priority distinguished by said distinction means, according to the detection by said detection means;
• and
• second transmission means for transmitting data after said first carrier has been transmitted by said first transmission means.

A control method of a radio communication apparatus for avoiding a collision between data to be transmitted and data transmitted by another radio communication apparatus, by notifying another radio communication apparatus of transmitting data by transmitting a first carrier prior to the data transmission, and by transmitting the first carrier after a predetermined time has passed in a case where a second carrier transmitted by another radio communication apparatus is detected before transmitting the first carrier, said method comprising the steps of:

• distinguishing priority of data to be transmitted;
• determining a time for transmitting said first carrier to notify of transmitting the data, according to the priority distinguished in said distinguishing step;
• detecting said second carrier transmitted by another radio communication apparatus while the time determined in said determining step passes;
• first transmitting said first carrier, according to the detection in said detecting step;
• and
• secondly transmitting data after said first carrier has been transmitted in said first transmitting step.

A control method of a radio communication apparatus for avoiding a collision between data to be transmitted and data transmitted by another radio communication apparatus, by notifying another radio communication apparatus of transmitting data by transmitting a first carrier into a predetermined time slot in a communication frame prior to the data transmission using the communication frame, and by transmitting the first carrier after a predetermined time has passed in a case where a second carrier transmitted by another radio communication apparatus is detected before transmitting the first carrier, said method comprising the steps of:

• distinguishing priority of data to be transmitted;
• detecting said second carrier transmitted by another radio communication apparatus;
• first transmitting said first carrier using a time slot in accordance with the priority distinguished in said distinguishing step, according to the detection in said detecting step;
• and
• second transmitting data after said first carrier has been transmitted in said first carrier transmitting step.

A control method for an exchange system including a main apparatus having exchanging capability and also including radio communication apparatus for avoiding a collision between data to be transmitted and data transmitted by another radio communication apparatus, by notifying another radio communication apparatus of transmitting data by transmitting a first carrier into a predetermined time slot in a communication frame prior to the data transmission using the communication frame, and by transmitting the first carrier after a predetermined time has passed in a case where a second carrier transmitted by another radio communication apparatus is detected before transmitting the first carrier, said method comprising the steps of:

• distinguishing priority of data to be transmitted;
• detecting said second carrier transmitted by another radio communication apparatus;
• first transmitting said first carrier using a time slot in accordance with the priority distinguished in said distinguishing step, according to the detection in the detection step;
• and
• second transmitting data after said first carrier has been transmitted in said first transmitting step.

A communication apparatus for performing communication using a time-division multiplexing technique, said apparatus comprising:

• identifying means for identifying the priority of communication data;
• selecting means for selecting a usable one time slot from among three time slots, in which a first time slot is used for performing a predetermined notification at a calling side communication apparatus, a second time slot is used for performing the predetermined notification at a called side communication apparatus, and a third time slot, usable at both the calling side communication apparatus and the called side communication apparatus, is used for performing the predetermined notification at a high priority according to the identified result by said identifying means;
• and
• notifying means for performing the predetermined notification by using the time slot based on the selection by said selection means.

A communication method for performing communication using a time-division multiplexing technique, said method comprising the steps of:

• identifying the priority of communication data;
• selecting a usable one time slot from among three time slots, in which a first time slot is used for performing a predetermined notification at a calling side communication apparatus, a second time slot is used for performing the predetermined notification at a called side communication apparatus, and a third time slot, usable at both the calling side communication apparatus and the called side communication apparatus, is used for performing the predetermined notification at a high priority according to the identified result in said identifying step;
• and
• performing the predetermined notification by using the time slot based on the selection in said selecting step.