Random access method and apparatus and system
First Claim
1. A User equipment (UE), applicable to performing random access, the UE comprising:
- a memory that stores a plurality of instructions; and
a processor coupled to the memory and configured to execute the instructions to;
randomly select a PRACH resource for transmitting a preamble from multiple PRACH resources pre-configured by an eNB for the UE; and
transmit the preamble on the selected PRACH resource, so that the eNB transmits a random access response to UE to which a correctly demodulated preamble corresponds according to preambles transmitted by UEs,wherein, the multiple PRACH resources pre-configured by the eNB hop in a frequency domain within multiple transmission time,wherein the processor is further configured to execute the instructions to;
calculate an RA-RNTI for performing CRC attachment on a PDCCH according to a PRACH resource occupied by the preamble; and
perform CRC de-attachment on a PDCCH according to the calculated RA-RNTI, so that the random access response is detected in a time window to which the preamble corresponds.
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Accused Products
Abstract
Embodiments of the present invention provide a random access method and apparatus and system. Where, the method includes: selecting randomly, by UE, a physical random access channel (PRACH) resource for transmitting a preamble from multiple PRACH resources pre-configured by an eNB for the UE; and transmitting the preamble by the UE on a selected PRACH resource, so that the eNB transmits a random access response to UE to which a correctly demodulated preamble corresponds according to preambles transmitted by UEs. With the method and apparatus of the embodiments of the present invention, coverage performance of an uplink channel and a downlink channel may be improved.
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Citations
11 Claims
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1. A User equipment (UE), applicable to performing random access, the UE comprising:
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a memory that stores a plurality of instructions; and a processor coupled to the memory and configured to execute the instructions to; randomly select a PRACH resource for transmitting a preamble from multiple PRACH resources pre-configured by an eNB for the UE; and transmit the preamble on the selected PRACH resource, so that the eNB transmits a random access response to UE to which a correctly demodulated preamble corresponds according to preambles transmitted by UEs, wherein, the multiple PRACH resources pre-configured by the eNB hop in a frequency domain within multiple transmission time, wherein the processor is further configured to execute the instructions to; calculate an RA-RNTI for performing CRC attachment on a PDCCH according to a PRACH resource occupied by the preamble; and perform CRC de-attachment on a PDCCH according to the calculated RA-RNTI, so that the random access response is detected in a time window to which the preamble corresponds. - View Dependent Claims (2)
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3. An eNB, applicable to controlling random access, the eNB comprising:
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a memory that stores a plurality of instructions; and a processor coupled to the memory and configured to execute the instructions to; configure multiple PRACH resources for all or part of UEs in a cell to which the eNB belongs, so that each of the UEs selects one of the multiple PRACH resources to transmit a preamble of its own; demodulate and detect the preambles transmitted by the UEs in all possible PRACH resources configured for the UEs; and transmit a random access response to UE to which a correctly demodulated preamble corresponds, wherein, the multiple PRACH resources configured by the eNB hop in a frequency domain within multiple transmission time, wherein the processor is further configured to execute the instructions to; calculate an RA-RNTI for performing CRC attachment on a PDCCH according to a PRACH resource used by a last combined preamble; perform CRC attachment on a PDCCH by using the RA-RNTI; and transmit the random access response by using a PDSCH scheduled by the PDCCH. - View Dependent Claims (4, 5)
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6. A User equipment (UE), applicable to performing random access, the UE comprising:
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a memory that stores a plurality of instructions; and a processor coupled to the memory and configured to execute the instructions to; transmit multiple preambles within multiple transmission time, wherein PRACH resources used by the preambles hop in a frequency domain; and detect a random access response in a time window to which each of the preambles corresponds, wherein the PRACH resources used by the preambles are pre-configured by an eNB, wherein the processor is further configured to execute the instructions to; calculate an RA-RNTI for performing CRC attachment on a PDCCH according to a PRACH resource occupied by a last preamble in transmitted multiple preambles in the transmission time; and perform CRC de-attachment on a PDCCH according to the calculated RA-RNTI, so that the random access response is detected in a time window to which each of the preambles corresponds. - View Dependent Claims (7)
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8. An eNB, applicable to controlling random access, the eNB comprising:
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a memory that stores a plurality of instructions; and a processor coupled to the memory and configured to execute the instructions to; receive multiple preambles transmitted by UE within multiple transmission time, wherein PRACH resources used by the preambles hop in a frequency domain; perform combined demodulation by using the received multiple preambles or a part of the multiple preambles; and transmit a random access response to UE to which a correctly demodulated preamble corresponds, wherein the processor is further configured to execute the instructions to; configure PRACH resources for transmitting preambles, so that the UE transmits the multiple preambles according to the PRACH resources configured by the eNB, calculate an RA-RNTI for performing CRC attachment on a PDCCH according to a PRACH resource used by a last combined preamble; perform CRC attachment on a PDCCH by using the RA-RNTI; and transmit the random access response by using a PDSCH scheduled by the PDCCH. - View Dependent Claims (9, 10)
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11. An eNB, applicable to controlling random access, the eNB comprising:
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a memory that stores a plurality of instructions; and a processor coupled to the memory and configured to execute the instructions to; receive multiple preambles transmitted by UE within multiple transmission time, wherein PRACH resources used by the preambles hop in a frequency domain; perform combined demodulation by using the received multiple preambles or a part of the multiple preambles; and transmit a random access response to UE to which a correctly demodulated preamble corresponds, wherein the processor is configured to execute the instructions to; calculate an RA-RNTI for performing CRC attachment on a PDCCH according to a PRACH resource used by a last combined preamble; perform CRC attachment on a PDCCH by using the RA-RNTI; and transmit the random access response by using a PDSCH scheduled by the PDCCH.
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Specification