Filtering and guard band for non-synchronized transmission
First Claim
1. A method for communication, the method comprisingselecting a sequence from a group of sequences for random access;
- allocating at least one sub-carrier on an uplink channel for at least one random access channel (RACH), the uplink channel comprising at least one data channel, and each data channel comprising a continuous set of data sub-carriers;
creating a guard band on each side of the at least one RACH by applying a raised cosine filter before transmitting the selected sequence using the RACH, wherein creating the guard band on each side of the at least one RACH further comprises;
for each continuous set of multiple RACHs among the at least one RACH, applying the raised cosine filter to a first frequency bandwidth that corresponds to a combination of a first set of sub-carriers adjacent to a first side of the continuous set of multiple RACHs, the continuous set of multiple RACHs, and a second set of sub-carriers adjacent to a second side of the continuous set of multiple RACHs;
mapping the selected sequence to the at least one RACH to generate a at least one RACH signal; and
transmitting the at least one RACH signal to a base station.
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Accused Products
Abstract
A wireless terminal capable of communicating with a wireless communication system comprised of a plurality of wireless terminals and a plurality of base stations. The wireless terminal selects a sequence from a group of certain sequences for random access. At least one sub-carriers on an uplink channel including at least one data channel is allocated for at least one random access channel. Each data channel includes a continuous set of data sub-carriers. The wireless terminal then filters the at least one random access channel by applying a Raised Cosine filter, maps the selected sequence to the at least one random access channel to generate a random access channel signal, and transmits the random access channel signal to a base station.
9 Citations
20 Claims
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1. A method for communication, the method comprising
selecting a sequence from a group of sequences for random access; -
allocating at least one sub-carrier on an uplink channel for at least one random access channel (RACH), the uplink channel comprising at least one data channel, and each data channel comprising a continuous set of data sub-carriers; creating a guard band on each side of the at least one RACH by applying a raised cosine filter before transmitting the selected sequence using the RACH, wherein creating the guard band on each side of the at least one RACH further comprises; for each continuous set of multiple RACHs among the at least one RACH, applying the raised cosine filter to a first frequency bandwidth that corresponds to a combination of a first set of sub-carriers adjacent to a first side of the continuous set of multiple RACHs, the continuous set of multiple RACHs, and a second set of sub-carriers adjacent to a second side of the continuous set of multiple RACHs; mapping the selected sequence to the at least one RACH to generate a at least one RACH signal; and transmitting the at least one RACH signal to a base station. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A wireless terminal comprising:
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a transmitter configured to transmit signals to a base station over an uplink channel; and a processor configured to; select a sequence from a group of certain sequences, allocate at least one subcarrier on the uplink channel for at least one random access channel (RACH), the uplink channel comprising at least one data channel, and each data channel comprising a continuous set of data sub-carriers, create a guard band on each side of the at least one RACH by applying a raised cosine filter before transmitting the selected sequence using the RACH, wherein to create the guard band on each side of the at least one RACH the processor is further configured to, for each continuous set of multiple RACHs among the at least one RACH, apply the raised cosine filter to a second frequency bandwidth that corresponds to a combination of a first set of data sub-carriers adjacent to a first side of the continuous set of multiple RACHs, the continuous set of multiple RACHs, and a second set of data sub-carriers adjacent to a second side of the continuous set of multiple RACHs, map the selected sequence to the at least one RACH to generate a RACH signal, and control the transmitter to transmit the RACH the base station. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A wireless communication system comprising:
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a first wireless communication device configured to; select a sequence from a group of certain sequences; allocate at least one sub-carrier on an uplink channel for at least one random access channel (RACH), the uplink channel comprising at least one data channel, and each data channel comprising a continuous set of data sub-carriers, create a guard band on each side of the at least one RACH by applying a raised cosine filter before transmitting the selected sequence on the RACH, wherein to create the guard band on each side of the at least on RACH, the first wireless communication device is further configured to, for each continuous set of multiple RACHs among the at least one RACH, apply the raised cosine filter to a second frequency bandwidth that corresponds to a combination of a first set of data sub-carriers adjacent to a first side of the continuous set of multiple RACHs, the continuous set of multiple RACHs, and a second set of data sub-carriers adjacent to a second side of the continuous set of multiple RACHs, map the selected sequence to the at least one RACH to generate a RACH signal, and transmit the RACH signal; and a second wireless communication device configured to receive the RACH signal comprising the selected sequence, and transmit timing synchronization information to the first wireless communication device. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification