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US 8,559,382 B2Granted
Preamble allocation method and random access method in mobile communication system
AssigneeElectronics and Telecommunications Research Institute
InventorsJae-Heung Kim, Kyoung-Seok Lee, Jung-Im Kim, Byung-Han Ryu, Seung-Chan Bang
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Abstract
The present invention relates to a preamble allocation method and a random access method in a mobile communication system. In the present invention, one among preamble resources is allocated to specific mobile stations in advance, before random access. The mobile stations request random access by transmitting a preamble based on the pre-allocated preamble resource to a base station. It is therefore possible to prevent collision caused by the fact that other mobile stations transmit the same preamble.
Claims21
A method for a base station to allocate a preamble to a mobile station, comprising:
- classifying preamble resources into a contention-based group and a reserved allocation group to generate classification information for the preamble resources;
- transmitting the classification information to the mobile station;
- selecting one preamble index belonging to the reserved allocation group;
- and
- sending, to the mobile station, the selected preamble index belonging to the reserved allocation group;
- wherein the mobile station requests random access based on a corresponding preamble generated from the received selected preamble index.
3 more elements
A method for a base station to perform a random access procedure with a mobile station, comprising:
- classifying a plurality of random access preambles into a contention based random access preamble group and a non-contention based random access preamble group to generate system information including classification information which enables to classify the plurality of random access preambles;
- broadcasting the system information;
- selecting one random access preamble index corresponding to one random access preamble belonging to the non-contention based random access preamble group;
- allocating, to the mobile station, the corresponding one random access preamble in association with the selected random access preamble index;
- sending, to the mobile station the selected random access preamble index;
- and
- in response to receiving, from the mobile station, a random access request on the basis of the corresponding one random access preamble generated from the selected random access preamble index:
- providing a random access response to the mobile station.
5 more elements
A method for a base station to perform a random access procedure with a mobile station, comprising:
- classifying a plurality of random access preambles into a contention based random access preamble group and a non-contention based random access preamble group to generate system information including classification information which enables to classify the plurality of random access preambles;
- broadcasting the system information;
- selecting one random access preamble index corresponding to one random access preamble belonging to the non-contention based random access preamble group;
- allocating, to the mobile station, the corresponding one random access preamble in association with the selected random access preamble index;
- sending, to the mobile station the selected random access preamble index;
- and
- in response to receiving, from the mobile station, a random access request on the basis of the corresponding one random access preamble generated from the selected random access preamble index:
- receiving the allocated random access preamble to provide a random access response to the mobile station.
5 more elements
A random access method of a mobile station, comprising:
- receiving, from a base station, system information including information which enables to classify a plurality of random access preambles into a contention based random access preamble group and a non-contention based random access preamble group;
- receiving, from the base station, a selected random access preamble index indicating allocation information for one corresponding random preamble belonging to the non-contention based random access preamble group;
- when the mobile station receives, from the base station, the selected random access preamble index, generating the corresponding random preamble using the selected random access preamble index and transmitting a random access request including the corresponding random access preamble to the base station;
- and
- receiving a random access response from the base station.
2 more elements
A random access method of a mobile station, comprising:
- receiving, from a base station, system information including information which enables to classify a plurality of random access preambles into a contention based random access preamble group and a non-contention based random access preamble group;
- receiving, from the base station, a selected random access preamble index indicating allocation information for one corresponding random preamble belonging to the non-contention based random access preamble group;
- when the mobile station receives, from the base station, the selected random access preamble index, generating the corresponding random preamble using the selected random access preamble index and transmitting a random access request including the corresponding random access preamble to the base station;
- when the mobile station does not receive random access preamble index indicating allocation information for random access preamble belonging to the non-contention based random access preamble group, transmitting a contention-based random access request including one random access preamble belonging to a contention based random access preamble group to the base station;
- and
- receiving a random access response from the base station.
3 more elements
Dependencies are inferred from the claim text.