96 results about "Transmission rights" patented technology

A method and device for bi-directionally transmitting and receiving data during an allocated time period are provided. The device includes a Physical Layer (PHY) module receiving a Medium Access Control (MAC) frame through a wireless medium, a MAC module reading a value of a first field in the received MAC frame, wherein the first field specifies whether there is more data to be sent, and a transmission rights determining module determining that a transmission right has been passed to the wireless device when the value of the first field is a first bit and a channel is idle during a predetermined threshold time after reception of the MAC frame, wherein the first bit represents that there is no more data to be sent.

According to an aspect of the invention, there is provided a wireless communication apparatus for performing a first wireless communication with a first channel having a first bandwidth, and a second wireless communication with a second channel having a second bandwidth wider than the first bandwidth and having a frequency band covering the first channel, in accordance with CSMA/CA system by carrier sense, including: a predicting unit predicting a first time required until a transmission right for the first wireless communication is captured, and a second time required until a transmission right for the second wireless communication is captured; a judging unit judging that either one communication is recommended based upon the first and second times; and a producing unit producing, when judged that a wireless communication different from a present wireless communication is recommended, a notification frame including information indicative of the recommended wireless communication.

A mobile communication terminal for transmitting/receiving image data over a group communication network includes: a push-to-talk (PTT) key for requesting a transmission right in a group communication mode; a vocoder for encoding a user voice signal received via a microphone; a memory for storing various image data; a controller for combining voice data received from the vocoder with the image data read from the memory to form a packet, or separating the image data from the received packet to perform an output control process; and a transceiver for transmitting packet data received from the controller to a group communication management center, or receiving the packet data from the group communication management center.

Provided is a wireless relay system that improves system throughput between terminal stations and flexibly makes system throughput variable with respect to short-term traffic fluctuations. In the wireless relay system, a plurality of relay stations relay communication between two terminal stations that perform random access. The terminal stations and the relay stations include a slot synchronization unit, a time synchronization unit, and a transmission unit. The slot synchronization unit synchronizes slot timing of a time slot indicating a unit time. The time synchronization unit performs time synchronization for synchronization of the slot timing. The transmission unit transmits a transmission packet to a wireless line in synchronization with the slot timing. A transmission right is allocated for at least one time slot to each of a plurality of groups which are configured so that a group of a terminal station or a relay station and a group of an adjacent terminal station or an adjacent relay station are different from each other. The transmission unit transmits the transmission packet to the wireless line only in a time slot in which the transmission right is allocated to the group to which the terminal station or the relay station belongs.

Provided is a method and system for requesting and granting a media transmission right of a PoC user. The method includes a PoC client transmitting an MBCP Request message to a PoC server, the PoC server receiving the MBCP Request message, determining whether a current state corresponds to a media transmission denial condition, and if it is determined that the current state corresponds to a media transmission denial condition, transmitting an MBCP Deny message containing at least one of time information of a media transmission timer and time information of a retry-after timer to the PoC client, and the PoC client receiving the MBCP Deny message, activating the media transmission timer and the retry-after timer using the respective time information, and re-transmitting the MBCP Request message to the PoC server if one of the media transmission timer and the retry-after timer, the retry-after timer having a longer time value, expires.

A connection apparatus is employed which is connected to a repeating apparatus for providing the PoC for first communication apparatuses having a PoC function. Call connection is established between the connection apparatus and second communication apparatus not having the PoC function. In the connection apparatus, recorded is apparatus information for identifying each second communication apparatus. The connection apparatus has the function of acting as a proxy of the second communication apparatus identified by the apparatus information. This function consists of the function of performing half duplex communication with the repeating apparatus; the function of transmitting output data received from the second communication apparatus, to the repeating apparatus when the second communication apparatus has acquired transmission right; and the function of transmitting received output data to the second communication apparatus when the output data is received from the repeating apparatus.

The invention discloses an optimization method of a non-channel way CSMA-CA (Carrier Sense Multiple Access-Conflict Avoidance) algorithm based on IEEE802.15.4 standard. In the method, the setting of a prior transmission right grade is introduced so that node data frames can be sent once to reduce nodes used by channel competition and delay channel waste brought by the competition; the receipt of an ACK response is brought into an algorithm flow and success or failure of sending is judged so that the communication process is more complete; during cancelling channel occupation is cancelled, thenumber of backoff used by non-competition is avoided to bebeing increased, the probability of sending failure easily occurred is reduced, one-to-one useful load transmission rate is improved from themaximum 120kb/s to the maximum 180kb/s, and the useful load transmission rate can also reach over 150kb/s under the condition that multiple nodes simultaneously send requests, thereby greatly enhancing the effective utilization ratio of channels.

The subject invention provides a communication management system that allots transmission rights according to requests from the communication stations. The allocation of the transmission rights is carried out within a specified predefined period. The system re-allots transmission rights to at least a part of the communication stations at a time point where all communication stations, that have been provided with transmission rights, consume their transmission right grant periods, or complete their transmission within the transmission right grant periods. With this arrangement, it is possible to securely prevent waste of the communication band, realizing effective use of the communication band. Further, the transmission station in a tolerable communication condition can be immune to bad influence from the transmission station in a bad condition.

A media session data transmission control method, a control relation negotiation method and a control device and a system thereof. The data transmission control method includes: the server obtains the media transmission right request of the sender (S601); the server distributes the first media transmission right for the sender based on the first media control strategy (S602); the control relation negotiation method includes: the server receives the media negotiation request from the caller, the media information to be negotiated is carried in the media negotiation request; the server establishes the corresponding media control relation for the caller based on the second media control strategy. Through the application of the media control strategy, the invention optimizes the existing media control process, provides more reasonable and efficient media control, the invention can be applied to multimedia and multiple party communication, and multimedia cluster communication widely.

An ATM cell multiplexer is arranged so that in the up direction from the terminal equipments/ATM cell interfaces to the ATM switchboard the ATM bus scheduler allocates the transmission rights for each CLAD unit in accordance with a preset schedule table and predetermined service categories or traffic control for the transmission of cells, and in the down direction from the ATM switchboard to the terminal equipments/ATM cell interfaces the cells are broadcast to all of the CLAD units which decide for the reception of the cells as to whether or not the cells are addressed to themselves.

There is provided with a radio communication method including: managing carrier sensing states of any one of two first channels having identical bandwidths and a second channel including both bands of the two first channels; determining whether to transmit transmission data using the first channel or the second channel; attempting to acquire a transmission right using the second channel based on the carrier sensing state of the second channel when the transmission data is determined to be transmitted using the second channel; and performing control such that the transmission data is transmitted using any one of the first channels when the time during which the attempt to acquire the transmission right using the second channel is made exceeds a time threshold set in advance.

In a radio information communicating system of the present invention, a radio terminal (2a) normally transmits a packet by CSMA/CA technique. In the packet is embedded a time in which a packet to be next transmitted will be abandoned in the radio terminal (2a) due to time-out. Here, an AP 1 monitors such information and when a packet which the radio terminal (2a) is trying to transmit is about to be abandoned in the radio terminal (2a) due to time-out, grants to the radio terminal (2a) a transmission right based on polling technique. Thus, there is provided a wireless LAN system which is controllable in such a manner that specific data such as audio data will not be abandoned within a radio terminal at the transmitting end due to time-out, without imposing a heavy control load on the whole system.

Provided is a push-to-talk (PTT) communication system including: a server for controlling PTT communications; and a mobile communication terminal that requests the server for a voice transmission right for transmitting voice information to a predetermined communication counterpart based on the PTT communications. The mobile communication terminal requests the server for the voice transmission right when detecting that a voice is being inputted thereto. The mobile communication terminal includes: a voice input section; and a control section for transmitting a request for a voice transmission right to a PTT server when detecting that a voice is being inputted to the mobile communication terminal. According to the PTT communication system, it is possible to readily transmit a voice based on the PTT communications and respond to a voice without pressing a PTT button.

A method and an apparatus for transmitting data in a linear-type or ring-type network structured by a plurality of nodes and both-way transmission lines each connecting between adjacent nodes includes that each node operates as a left TE, a right TE, or an IE. The left and right TEs prepare token packets each including a transmission right and packet trailers each including data packet storage area. The left TE transmits the packet trailers on a right direction line of the both-way transmission line.

A method transmitting and receiving data other than voice data and preventing deterioration in quality of communication voice data due to transmission and reception of the other than voice data, and utilizing a limited communication bandwidth when a plurality of users conduct the broadcast communication through common use of the conference room on the network. Upon a user terminal transmitting second data, verifying whether any of a plurality of identified user terminals has a right of transmission of first data. The method further includes that upon a user terminal having the a transmission right of first data, setting a value obtained by subtracting the communication bandwidth required for transmission of the first data from the communication bandwidth which each user terminal can use as the communication bandwidth for transmission of the second data. Upon no user terminal having a transmission right of first data, setting a communication bandwidth that each user terminal can use as the communication bandwidth for transmission of the second data.

The invention provides a group message interaction realization method, which comprises the following steps of: a communication server authenticates the received group message instruction transmission right of a source user, authenticates the group message instruction receiving rights of group members after the group message instruction transmission right of the source user passes the authentication, and transmits a group message and the information of each member in a member Hash table corresponding to a found group identifier to a synchronous storage server after the group message instruction receiving rights of the group members pass the authentication; and after receiving the group message, the synchronous storage server stores and updates the group message with the group identifier, and transmits the updated group message with the group identifier to each group member in the member Hash table corresponding to the group identifier. The invention provides a group message interaction realization system. By the method and the system, secure group communication and multi-member secure communication can be realized without downloading and installing any software.

The invention provides a webpage-based group information interaction realization method, which comprises the following steps that: a communication server authenticates received group message instruction transmission rights of a source user, authenticates group message instruction receiving rights of group members after the received group message instruction transmission rights of the source user pass the authentication, and transmits an acquired group message to a synchronous storage server after the group message instruction receiving rights of the group members pass the authentication; and the synchronous storage server stores and updates the group message, finds each group member in a member Hash table corresponding to a group identifier according to the member Hash table corresponding to the stored group identifier, and transmits the group message. The invention also provides a webpage-based group information interaction realization system. By the method and the system, group security communication and multi-user security communication can be realized without downloading and installing any software.

A communication apparatus includes a receiving unit that receives a data frame including a plurality of pieces of unit data and transmitted from a communication partner; a determining unit that determines whether there is data loss, for each piece of unit data included in the data frame received by the receiving unit; a transmission right acquiring unit that acquires a transmission right; and a generating unit that generates grant data for granting the transmission right acquired by the transmission right acquiring unit to the communication partner, when the determining unit determines that at least any one of the pieces of unit data has been lost.

A method for creating working space for construction of a new high-voltage transmission line within an existing three phase high voltage transmission right of way without removing the existing three-phase high voltage transmission line already occupying that right of way from service. The method includes removing the voltage applied to one phase of the existing transmission line, continuing to transmit power on the conductors comprising the remaining phases, and installing new support structures and their associated conductors on the right of way while the existing transmission line continues to operate.