United access channel for use in a mobile communications system
First Claim
1. A method of operating a first base station in a cellular telecommunications system, wherein the first base station has first and second transceivers that receive radio signals that are divided into uplink time slots, the method comprising the steps of:
- operating the first transceiver in synchronization with a first frame of uplink time slots;
operating the second transceiver in synchronization with a second frame of uplink time slots, wherein the second frame of uplink time slots are offset by a predetermined amount of time relative to the first frame of uplink time slots; and
using a first time slot in each of the first and second transceivers in combination so as to provide a united random access channel, whereby when a mobile station transmits an uplink radio frequency burst, access of the first base station by the mobile station is recognized if the uplink radio frequency burst is received by the first transceiver during the first transceiver'"'"'s first time slot, and access of the first base station by the mobile station is recognized if the uplink radio frequency burst is received by the second transceiver during the second transceiver'"'"'s first time slot,wherein the uplink radio frequency burst is received by both the first and second transceivers during the respective first time slots of the first and second transceivers,and further comprising the steps of;
detecting a first access attempt during the first time slot of the first transceiver;
detecting a second access attempt during the first time slot of the second transceiver; and
comparing at least one of message contents, frame number and access delay of the first and second access attempts and determining that they correspond to an access attempt by one mobile station on the basis of the comparison.
1 Assignment
0 Petitions
Accused Products
Abstract
A method and apparatus for operating a first base station in a cellular telecommunications system, wherein the first base station has first and second transceivers that receive radio signals that are divided into uplink time slots, includes operating the first transceiver in synchronization with a first frame of uplink time slots and operating the second transceiver in synchronization with a second frame of uplink time slots, wherein the second frame of uplink time slots are offset by a predetermined amount relative to the first frame of uplink time slots. A united random access channel is formed by using a first time slot in each of the first and second transceivers in combination. A mobile station that transmits an uplink radio frequency burst may access the first base station by having the uplink radio frequency burst received by at least one of the first and second transceivers during that transceiver'"'"'s first time slot. The uplink radio frequency burst may be received by both the first and second transceivers during the respective first time slots of the first and second transceivers. In this case, a comparison is made between the message contents, frame number and access delay of the bursts received by the first and second transceivers in order to determine that the bursts correspond to an access attempt by one mobile station.
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Citations
22 Claims
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1. A method of operating a first base station in a cellular telecommunications system, wherein the first base station has first and second transceivers that receive radio signals that are divided into uplink time slots, the method comprising the steps of:
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operating the first transceiver in synchronization with a first frame of uplink time slots; operating the second transceiver in synchronization with a second frame of uplink time slots, wherein the second frame of uplink time slots are offset by a predetermined amount of time relative to the first frame of uplink time slots; and using a first time slot in each of the first and second transceivers in combination so as to provide a united random access channel, whereby when a mobile station transmits an uplink radio frequency burst, access of the first base station by the mobile station is recognized if the uplink radio frequency burst is received by the first transceiver during the first transceiver'"'"'s first time slot, and access of the first base station by the mobile station is recognized if the uplink radio frequency burst is received by the second transceiver during the second transceiver'"'"'s first time slot, wherein the uplink radio frequency burst is received by both the first and second transceivers during the respective first time slots of the first and second transceivers, and further comprising the steps of; detecting a first access attempt during the first time slot of the first transceiver; detecting a second access attempt during the first time slot of the second transceiver; and comparing at least one of message contents, frame number and access delay of the first and second access attempts and determining that they correspond to an access attempt by one mobile station on the basis of the comparison.
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2. A method of operating a first base station in a cellular telecommunications system, wherein the first base station has first and second transceivers that receive radio signals that are divided into uplink time slots, the method comprising the steps of:
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operating the first transceiver in synchronization with a first frame of uplink time slots; operating the second transceiver in synchronization with a second frame of uplink time slots, wherein the second frame of uplink time slots are offset by a predetermined amount of time relative to the first frame of uplink time slots; and using a first time slot in each of the first and second transceivers in combination so as to provide a united random access channel, whereby when a mobile station transmits an uplink radio frequency burst, access of the first base station by the mobile station is recognized if the uplink radio frequency burst is received by the first transceiver during the first transceiver'"'"'s first time slot, and access of the first base station by the mobile station is recognized if the uplink radio frequency burst is received by the second transceiver during the second transceiver'"'"'s first time slot, and further comprising the step of; using the first time slots of the first and second transceivers to support a dedicated channel in addition to supporting the united random access channel, wherein the dedicated channel includes a plurality of sub-channels, and further comprising the step of activating one of the sub-channels independently of other sub-channels during one of the first time slots of the first and second transceivers.
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3. A method of operating a first base station in a cellular telecommunications system, wherein the first base station has first and second transceivers that receive radio signals that are divided into uplink time slots, the method comprising the steps of:
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operating the first transceiver in synchronization with a first frame of uplink time slots; operating the second transceiver in synchronization with a second frame of uplink time slots, wherein the second frame of uplink time slots are offset by a predetermined amount of time relative to the first frame of uplink time slots; and using a first time slot in each of the first and second transceivers in combination so as to provide a united random access channel, whereby when a mobile station transmits an uplink radio frequency burst, access of the first base station by the mobile station is recognized if the uplink radio frequency burst is received by the first transceiver during the first transceiver'"'"'s first time slot, and access of the first base station by the mobile station is recognized if the uplink radio frequency burst is received by the second transceiver during the second transceiver'"'"'s first time slot, wherein a second time slot in one of the first and second frames of uplink time slots serves a dedicated channel used by a second mobile station, and further comprising the step of handing over service of the second mobile station to a second base station, wherein the step of handing over service comprises the steps of; using information about relative locations between the first and second base stations to identify, in the second base station, a frame of uplink time slots having a timing offset that is predicted to be appropriate for receiving an uplink transmission from the second mobile station to the second base station; and selecting a second time slot in the identified frame of time slots and assigning the selected second time slot for use by the second mobile station after the handover. - View Dependent Claims (4, 5, 6)
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7. A method of operating a first base station in a cellular telecommunications system, wherein the first base station has first and second transceivers that receive radio signals that are divided into uplink time slots, the method comprising the steps of:
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operating the first transceiver in synchronization with a first frame of uplink time slots; operating the second transceiver in synchronization with a second frame of uplink time slots, wherein the second frame of uplink time slots are offset by a predetermined amount of time relative to the first frame of uplink time slots; and using a first time slot in each of the first and second transceivers in combination so as to provide a united random access channel, whereby when a mobile station transmits an uplink radio frequency burst, access of the first base station by the mobile station is recognized if the uplink radio frequency burst is received by the first transceiver during the first transceiver'"'"'s first time slot, and access of the first base station by the mobile station is recognized if the uplink radio frequency burst is recieved by the second transceiver during the second transceiver'"'"'s first time slot, wherein a second time slot in one of the first and second frames of uplink time slots serves a dedicated channel used by a second mobile station, and further comprising the step of handing over service of the second mobile station to a second base station, wherein the step of handing over service comprises the steps of; using information about path delay between the second mobile station and the first base station to identify, in the second base station, a frame of uplink time slots having a timing offset that is predicted to be appropriate for receiving an uplink transmission from the second mobile station to the second base station; and selecting a second time slot in the identified frame of time slots and assigning the selected second time slot for use by the second mobile station after the handover. - View Dependent Claims (8, 9, 10, 11)
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12. An apparatus for operating a first base station in a cellular telecommunications system, wherein the first base station has first and second transceivers that receive radio signals that are divided into uplink time slots, the apparatus comprising:
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means for operating the first transceiver in synchronization with a first frame of uplink time slots; means for operating the second transceiver in synchronization with a second frame of uplink time slots, wherein the second frame of uplink time slots are offset by a predetermined amount of time relative to the first frame of uplink time slots; and means for using a first time slot in each of the first and second transceivers in combination so as to provide a united random access channel, whereby when a mobile station transmits an uplink radio frequency burst, access of the first base station by the mobile station is recognized if the uplink radio frequency burst is received by the first transceiver during the first transceiver'"'"'s first time slot, and access of the first base station by the mobile station is recognized if the uplink radio frequency burst is received by the second transceiver during the second transceiver'"'"'s first time slot, wherein the uplink radio frequency burst is received by both the first and second transceivers during the respective first time slots of the first and second transceivers, and further comprising; means for detecting a first access attempt during the first time slot of the first transceiver; means for detecting a second access attempt during the first time slot of the second transceiver; and means for comparing at least one of message contents, frame number and access delay of the first and second access attempts and determining that they correspond to an access attempt by one mobile station on the basis of the comparison.
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13. An apparatus for operating a first base station in a cellular telecommunications system, wherein the first base station has first and second transceivers that receive radio signals that are divided into uplink time slots, the apparatus comprising:
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means for operating the first transceiver in synchronization with a first frame of uplink time slots; means for operating the second transceiver in synchronization with a second frame of uplink time slots, wherein the second frame of uplink time slots are offset by a predetermined amount of time relative to the first frame of uplink time slots; and means for using a first time slot in each of the first and second transceivers in combination so as to provide a united random access channel, whereby when a mobile station transmits an uplink radio frequency burst, access of the first base station by the mobile station is recognized if the uplink radio frequency burst is received by the first transceiver during the first transceiver'"'"'s first time slot, and access of the first base station by the mobile station is recognized if the uplink radio frequency burst is received by the second transceiver during the second transceiver'"'"'s first time slot, and further comprising; means for using the first time slots of the first and second transceivers to support a dedicated channel in addition to supporting the united random access channel, wherein the dedicated channel includes a plurality of sub-channels, and further comprising means for activating one of the sub-channels independently of other sub-channels during one of the first time slots of the first and second transceivers.
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14. An apparatus for operating a first base station in a cellular telecommunications system, wherein the first base station has first and second transceivers that receive radio signals that are divided into uplink time slots, the apparatus comprising:
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means for operating the first transceiver in synchronization with a first frame of uplink time slots; means for operating the second transceiver in synchronization with a second frame of uplink time slots, wherein the second frame of uplink time slots are offset by a predetermined amount of time relative to the first frame of uplink time slots; and means for using a first time slot in each of the first and second transceivers in combination so as to provide a united random access channel, whereby when a mobile station transmits an uplink radio frequency burst, access of the first base station by the mobile station is recognized if the uplink radio frequency burst is received by the first transceiver during the first transceiver'"'"'s first time slot, and access of the first base station by the mobile station is recognized if the uplink radio frequency burst is received by the second transceiver during the second transceiver'"'"'s first time slot, wherein a second time slot in one of the first and second frames of uplink time slots serves a dedicated channel used by a second mobile station, and further comprising means for handing over service of the second mobile station to a second base station, wherein the means for handing over service comprises; means for using information about relative locations between the first and second base stations to identify, in the second base station, a frame of uplink time slots having a timing offset that is predicted to be appropriate for receiving an uplink transmission from the second mobile station to the second base station; and means for selecting a second time slot in the identified frame of time slots and assigning the selected second time slot for use by the second mobile station after the handover. - View Dependent Claims (15, 16, 17)
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18. An apparatus for operating a first base station in a cellular telecommunications system, wherein the first base station has first and second transceivers that receive radio signals that are divided into uplink time slots, the apparatus comprising:
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means for operating the first transceiver in synchronization with a first frame of uplink time slots; means for operating the second transceiver in synchronization with a second frame of uplink time slots, wherein the second frame of uplink time slots are offset by a predetermined amount of time relative to the first frame of uplink time slots; and means for using a first time slot in each of the first and second transceivers in combination so as to provide a united random access channel, whereby when a mobile station transmits an uplink radio frequency burst, access of the first base station by the mobile station is recognized if the uplink radio frequency burst is received by the first transceiver during the first transceiver'"'"'s first time slot, and access of the first base station by the mobile station is recognized if the uplink radio frequency burst is received by the second transceiver during the second transceiver'"'"'s first time slot, wherein a second time slot in one of the first and second frames of uplink time slots serves a dedicated channel used by a second mobile station, and further comprising means for handing over service of the second mobile station to a second base station, wherein the means for handing over service comprises; means for using information about radio path delay between the second mobile station and the first base station to identify, in the second base station, a frame of uplink time slots having a timing offset that is predicted to be appropriate for receiving an uplink transmission from the second mobile station to the second base station; and means for selecting a second time slot in the identified frame of time slots and assigning the selected second time slot for use by the second mobile station after the handover. - View Dependent Claims (19, 20, 21, 22)
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Specification