Random access method and apparatus
First Claim
1. A random access method, comprising:
- determining a secondary cell configured for a UE and obtaining random access related parameter preset for the secondary cell; and
sending the random access related parameter to the UE to instruct the UE to initiate random access procedure over the secondary cell corresponding to the random access related parameter,wherein sending the random access related parameter to the UP to instruct the UE to initiate the random access procedure over the secondary cell corresponding to the random access related parameter comprises;
instructing the UE to initiate the random access procedure over the secondary cell corresponding to the random access related parameter immediately after sending the random access related parameter to the UE;
orsending a physical downlink control channel command to the UE after sending the random access related parameter to the UE to instruct the UE to initiate the random access procedure over the secondary cell corresponding to the random access related parameter;
wherein, if the secondary cell is detected to belong to a Timing Advance (TA) group, applying Timing Advance (TA) information preset for the secondary cell in the random access procedure to all cells comprised in the TA group, and maintaining a Time Alignment Timer (TAT) of the TA group with use of the TA information.
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Abstract
The invention discloses a random access method and apparatus so as to perform random access for a User Equipment (UE) with a plurality of aggregated cells in a carrier aggregation-enabled LTE-A system. The method includes: determining a secondary cell configured for a UE and obtaining random access related parameter preset for the secondary cell; and sending the random access related parameter to the UE to instruct the UE to initiate random access procedure over the secondary cell corresponding to the random access related parameter. The inventive method achieves the purpose of enabling the UE to be synchronized with the network side by performing random access over a specified cell, having the UE maintain uplink synchronization with the network side in the configured secondary cell and ensuring the overall performance of the system.
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Citations
16 Claims
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1. A random access method, comprising:
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determining a secondary cell configured for a UE and obtaining random access related parameter preset for the secondary cell; and sending the random access related parameter to the UE to instruct the UE to initiate random access procedure over the secondary cell corresponding to the random access related parameter, wherein sending the random access related parameter to the UP to instruct the UE to initiate the random access procedure over the secondary cell corresponding to the random access related parameter comprises; instructing the UE to initiate the random access procedure over the secondary cell corresponding to the random access related parameter immediately after sending the random access related parameter to the UE;
orsending a physical downlink control channel command to the UE after sending the random access related parameter to the UE to instruct the UE to initiate the random access procedure over the secondary cell corresponding to the random access related parameter; wherein, if the secondary cell is detected to belong to a Timing Advance (TA) group, applying Timing Advance (TA) information preset for the secondary cell in the random access procedure to all cells comprised in the TA group, and maintaining a Time Alignment Timer (TAT) of the TA group with use of the TA information. - View Dependent Claims (2, 3, 4, 5)
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6. A random access method, comprising:
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receiving random access related parameter. sent from network side, preset for a secondary cell configured locally; and initiating random access procedure over the secondary cell corresponding to the random access related parameter, wherein initiating random access procedure over the secondary cell corresponding to the random access related parameter comprises; initiating the random access procedure over the secondary cell corresponding to the random access related parameter immediately upon reception of the random access related parameter;
orinitiating the random access procedure over the secondary cell corresponding to the random access related parameter upon reception of a physical downlink control channel command after receiving the random access related parameter; wherein, if the secondary cell is detected to belong to a Timing Advance (TAT) group, then applying Timing Advance (TA) information obtained by the secondary cell in the random access procedure to all cells comprised in the TA group, and maintaining a Time Alignment Timer (TAT) of the TA group with use of the TA information. - View Dependent Claims (7, 8, 9, 10)
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11. A random access apparatus, comprising:
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an obtaining unit configured to determine a secondary cell configured for a UE and to obtain random access related parameter preset for the secondary cell; and a communicating unit configured to send the random access related parameter to the UE to instruct the UE to initiate random access procedure over the secondary cell corresponding to the random access related parameter, wherein the communicating unit instructs the UE to initiate the random access procedure over the secondary cell corresponding to the random access related parameter immediately after sending the random access related parameter to the UE;
or sends a physical downlink control channel command to the UE after sending the random access related parameter to the UE to instruct the UE to initiate the random access procedure over the secondary cell corresponding to the random access related parameter;wherein, if the secondary cell is detected to belong to a Timing Advance (TA) group, then the communicating unit applies Timing Advance (TA) information preset for the secondary cell in the random access procedure to all the cells comprised in the TA group, and maintains a Time Alignment Timer (TAT) of the TA group with use of the TA information. - View Dependent Claims (12, 13)
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14. A random access apparatus, comprising:
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a communicating unit configured to receive random access related parameter, sent from network side, preset for a secondary cell configured locally; and a processing unit configured to initiate random access procedure over the secondary cell corresponding to the random access related parameter, wherein the processing unit initiates the random access procedure over the secondary cell corresponding to the random access related parameter immediately after the communicating unit receives the random access related parameter;
orthe processing unit initiates the random access procedure over the secondary cell corresponding to the random access related parameter when the communicating unit receives a physical downlink control channel command after receiving the random access related parameter; wherein, if the communicating unit detects the secondary cell to belong to a Timing Advance (TA) group, then the processing unit applies Timing Advance (TA) information obtained by the secondary cell in the random access procedure to all the cells comprised in the TA group, and maintains a Time Alignment Timer (TAT) of the TA group with use of the TA information. - View Dependent Claims (15, 16)
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Specification