Communication apparatus and method providing robust service in the presence of deteriorated radio conditions
First Claim
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1. A communication apparatus which gives notice of existence to another device on a network, comprising:
- a transmission unit which transmits a communication apparatus notice signal to notify the other device of the existence of said communication apparatus and of a communication apparatus expiration period of information on service provided by said communication apparatus whenever the communication apparatus expiration period has elapsed;
a receiving unit which receives a device notice signal to notify the communication apparatus of the existence of a first other device and of a device expiration period of information on service provided by the first other device;
a management unit which manages the first other-device expiration period of information on service provided by the first other device on the basis of a previously received first other-device notice signal transmitted from the first other device, and manages the communication apparatus expiration period of information on service provided by said communication apparatus; and
a decision unit which decides whether or not a second other-device notice signal has been transmitted from the first other device before a time prior to the first other-device expiration period managed by said management unit by a predetermined time,wherein if the second other-device notice signal has been transmitted from the first other device at a time prior to the first other-device expiration period managed by said management unit by the predetermined time, said transmission unit transmits the communication apparatus notice signal by increasing a transmission power, independently of whether or not the communication apparatus expiration period managed by said management unit has expired.
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Abstract
Data communication using wireless service discovery is continuously provided even if a radio wave condition temporarily deteriorates or movement of an apparatus occurs. If a temporary deterioration in wireless radio wave environment is found in a communication apparatus including a service discovery function, a search is made again at a raised transmission power. Forcible disconnection processing from a higher-level layer is prevented when communication at the network layer level is ongoing.
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3 Claims
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1. A communication apparatus which gives notice of existence to another device on a network, comprising:
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a transmission unit which transmits a communication apparatus notice signal to notify the other device of the existence of said communication apparatus and of a communication apparatus expiration period of information on service provided by said communication apparatus whenever the communication apparatus expiration period has elapsed; a receiving unit which receives a device notice signal to notify the communication apparatus of the existence of a first other device and of a device expiration period of information on service provided by the first other device; a management unit which manages the first other-device expiration period of information on service provided by the first other device on the basis of a previously received first other-device notice signal transmitted from the first other device, and manages the communication apparatus expiration period of information on service provided by said communication apparatus; and a decision unit which decides whether or not a second other-device notice signal has been transmitted from the first other device before a time prior to the first other-device expiration period managed by said management unit by a predetermined time, wherein if the second other-device notice signal has been transmitted from the first other device at a time prior to the first other-device expiration period managed by said management unit by the predetermined time, said transmission unit transmits the communication apparatus notice signal by increasing a transmission power, independently of whether or not the communication apparatus expiration period managed by said management unit has expired. - View Dependent Claims (2)
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3. A communication method comprising:
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a transmission step of transmitting, by a communication apparatus, a communication apparatus notice signal to notify the other device of the existence of the communication apparatus and of a communication apparatus expiration period of information on service provided by the communication apparatus whenever the communication apparatus expiration period has elapsed; a receiving step of receiving a device notice signal to notify the communication apparatus of the existence of a first other device and of a device expiration period of information on service provided by the first other device; a management step of managing the first other-device expiration period of information on service provided by the first other device on the basis of a previously received first other-device notice signal transmitted from the first other device, and managing the communication apparatus expiration period of information on service provided by the communication apparatus; and a decision step of deciding whether or not a second other-device notice signal has been transmitted from the first other device before a time prior to the first other-device expiration period managed by said management unit by a predetermined time, wherein if the second other-device notice signal has been transmitted from the first other device at a time prior to the first other-device expiration period managed in said management step by the predetermined time, said transmission step is executed to transmit the communication apparatus notice signal by increasing a transmission power, independently of whether or not the communication apparatus expiration period managed in said management step has expired.
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Specification