1. A method for radio data transmission in a radio communication system including a radio terminal apparatus and a radio base station apparatus, the method comprising:
transmitting, by the radio base station apparatus, data and a signal indicating radio resource to be used for random access to an asynchronous radio terminal apparatus not synchronized with the radio base station apparatus on an uplink; and
transmitting, by the asynchronous radio terminal apparatus to the radio base station apparatus via a random access channel, a reply signal generated based on whether or not the data has been correctly decoded and on a signal received from the radio base station apparatus and indicating the radio resource.
2. The method for radio data transmission according to claim 1, wherein the radio base station apparatus transmits the signal indicating the radio resource to be used for the random access when simultaneously transmitting the data.
3. The method for radio data transmission according to claim 2, wherein the radio base station apparatus transmits the signal indicating the radio resource to be used for the random access before transmitting the data.
4. The method for radio data transmission according to claim 1, wherein the radio resource to be used for the random access is a preamble for use in establishment of synchronization of a synchronous channel.
5. The method for radio data transmission according to claim 4, wherein the base station apparatus transmits a request signal requesting transmission of the preamble in conjunction with the transmission of the data, to the asynchronous radio terminal apparatus.
6. A method for radio data transmission in a radio communication system including a radio terminal apparatus and a radio base station apparatus, the method comprising:
transmitting, by the radio base station apparatus, data to an asynchronous radio terminal apparatus not synchronized with the radio base station apparatus on an uplink, and transmitting timing adjustment information for synchronization simultaneously with or after the transmission of the data; and
establishing a synchronous channel with the radio base station apparatus based on the timing adjustment information and transmitting a reply signal indicating whether or not the data has been correctly received, to the radio base station apparatus via the synchronous channel, by the asynchronous radio terminal apparatus.
7. The method for radio data transmission according to claim 6, wherein the radio terminal apparatus stores information indicating whether or not the data has been correctly received, after the data is received and before the synchronization of the synchronous channel is established.
8. The method for radio data transmission according to claim 7, wherein the radio base station apparatus carries out a retransmission process of the data depending on whether or not the data has been correctly received, and
a retransmission timeout time for the retransmission process is set to be longer than a time provided for a process of establishing the synchronization of the synchronous channel which process is carried out by the radio terminal apparatus.
9. A communication system comprising a radio base station apparatus and a radio terminal apparatus,
wherein the radio base station apparatus comprises a transmission unit which transmits data and a signal indicating radio resource to be used for random access to an asynchronous radio terminal apparatus not synchronized with the radio base station apparatus on an uplink, the data and the signal being transmitted by the radio base station apparatus; and
the radio terminal apparatus comprises a transmission unit which transmits, to the radio base station apparatus via a random access channel, a reply signal generated based on whether or not the data has been correctly received and on the signal indicating the radio resource which has been received from the radio base station apparatus.
10. A communication system comprising a radio base station apparatus and a radio terminal apparatus,
wherein the radio base station apparatus comprises a transmission unit which transmits data to an asynchronous radio terminal apparatus not synchronized with the radio base station apparatus on an uplink and which transmits timing adjustment information for synchronization simultaneously with or after the transmission of the data; and
the radio terminal apparatus comprises:
a synchronization establishment unit which establishes a synchronous channel with the radio base station apparatus based on the timing adjustment information; and
a transmission unit which transmits a reply signal indicating whether or not the data has been correctly received, to the radio base station apparatus via the synchronous channel.
11. A radio terminal apparatus comprising:
a reception unit which receives data and a signal indicating radio resource to be used for random access, the data and the signal being transmitted from a radio base station apparatus to a radio terminal apparatus not synchronized with the radio base station apparatus on an uplink; and
a transmission unit which transmits, to the radio base station apparatus via a random access channel, a reply signal generated based on whether or not the data has been correctly received and on the signal indicating the radio resource which has been received from the radio base station apparatus.
12. A radio base station apparatus comprising:
a transmission unit which transmits data and a signal indicating radio resource to be used for random access to an asynchronous radio terminal apparatus which is a radio terminal apparatus not synchronized with the radio base station apparatus on an uplink; and
a reception unit which receives, via a random access channel, a reply signal generated based on whether or not the data has been correctly received and on the signal indicating the radio resource.
13. A radio base station apparatus comprising:
a transmission unit which transmits data to an asynchronous radio terminal apparatus which is a radio terminal apparatus not synchronized with the radio base station apparatus on an uplink and which transmits timing adjustment information for synchronization simultaneously with or after the transmission of the data; and
a reception unit which receives a reply signal indicating whether or not the data has been correctly received, from the radio terminal apparatus via the synchronous channel.
14. A radio terminal apparatus comprising:
a reception unit which receives data transmitted from a radio base station apparatus to the radio terminal apparatus not synchronized with the radio base station apparatus on an uplink and timing adjustment information for synchronization transmitted by the radio base station apparatus simultaneously with or after the transmission of the data;
a synchronization establishment unit which establishes a synchronous channel with the radio base station apparatus based on the timing adjustment information; and
a transmission unit which transmits a reply signal indicating whether or not the data has been correctly received, to the radio base station apparatus via the synchronous channel.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A method for powering up an optical network, comprising the steps of:
(a) selecting an optical link between a transmitter and a receiver in the optical network, the optical link being divided into a number of sections by monitoring points located between the transmitter and the receiver;
(b) selecting a first section of the optical link nearest to the transmitter in the optical network;
(c) gradually increasing optical power of an optical signal provided to the selected section of the optical link from the transmitter until the optical signal is detected at the monitoring point belonging to the selected section;
(d) verifying if the detected optical signal is being detected at a correct location according to a network specification and if the power of the detected optical signal is at the expected level according to the network specification;
(e) selecting a next section of the optical link adjacent to the previously selected section and further away from the transmitter in the optical network; and
(f) repeating the steps (c) to (e) until all sections in the optical link have been selected.
2. A method as described in claim 1, wherein the step (a) of selecting an optical link comprises selecting an optical link that has one section and one first monitoring point located at the receiver.
3. A method as described in claim 1, wherein the step (c) of gradually increasing the optical power comprises increasing the optical power continuously.
4. A method as described in claim 1, wherein the step (c) of gradually increasing optical power comprises decreasing attenuation of attenuators in the optical network.
5. A method as described in claim 1, further comprising the step of setting attenuation of attenuators and gain settings of amplifiers in the selected section, the step being performed after the step (d) of verifying.
6. A method as described in claim 5, wherein the step (c) of gradually increasing optical power comprises increasing the optical power in steps provided by sets of precalculated link budgets.
7. A method as described in claim 1, wherein the step (c) of gradually increasing optical power comprises detecting the optical signal at the monitoring point by detecting a dither tone modulated onto the signal.
8. A method as described in claim 1, further comprising the step of reconnecting the selected section of the optical link according to the network specification, if the step (d) of verifying gives the results that the detected optical signal is not being detected at the correct location.
9. A method as described in claim 1, the method being performed on a pre-existing optical network so that pre-existing signals on the network are not being disturbed.
10. A method as described in claim 9, the method being performed such that pre-existing amplifier gain settings are not being changed.
11. A method as described in claim 1, the method being performed on the link in the optical network remotely.
12. A system for powering up an optical network, comprising:
(a) means for selecting an optical link between a transmitter and a receiver in the optical network, the optical link being divided into a number of sections by monitoring points located between the transmitter and the receiver;
(b) means for selecting a first section of the optical link nearest to the transmitter in the optical network;
(c) means for gradually increasing optical power of an optical signal provided to the selected section of the optical link from the transmitter until the optical signal is detected at the monitoring point belonging to the selected section;
(d) means for verifying if the detected optical signal is being detected at a correct location according to a network specification and if the power of the detected optical signal is at the expected level according to the network specification;
(e) means for selecting a next section of the optical link adjacent to the previously selected section and further away from the transmitter in the optical network; and
(f) means for repeating the steps (c) to (e) until all sections in the optical link have been selected.
13. A system as described in claim 12, wherein the means (c) for gradually increasing optical power comprises means for gradually increasing the optical power in steps provided by sets of precalculated link budgets.