Method and system for transmitting physical random access channel
First Claim
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1. A method for transmitting a Physical Random Access Channel (PRACH), comprising:
- in a Carrier Aggregation (CA) scenario, transmitting in a Primary Serving Cell (Pcell) or a Secondary Serving Cell (Scell), by a base station, a random access trigger message to a User Equipment (UE);
transmitting in the Scell, by the UE, a PRACH;
transmitting in the Pcell or the Scell, by the base station, a random access procedure message to the UE; and
when the base station transmits, in the Pcell, the random access process message to the UE, detecting in the Pcell, by the UE, the downlink control information in a common search space within one subframe, or detecting, in both the Pcell and the Scell, the downlink control information in a common search space within one subframe;
orwhen the base station transmits, in the Scell, the random access process message to the UE, detecting in both the Pcell and the Scell, by the UE, the downlink control information in a common search space within one subframe.
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Abstract
The disclosure discloses a method and system for transmitting a Physical Random Access Channel (PRACH). The method includes: in a Carrier Aggregation (CA) scenario, a base station transmits, in a Primary Serving Cell (Pcell) or a Secondary Serving Cell (Scell), a random access trigger message to a User Equipment (UE) (401); the UE transmits, in the Scell, a PRACH (402); and the base station transmits, in the Pcell or an Scell, a random access procedure message to the UE (403). With the disclosure, a PRACH can be transmitted in an Scell in the CA scenario.
41 Citations
34 Claims
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1. A method for transmitting a Physical Random Access Channel (PRACH), comprising:
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in a Carrier Aggregation (CA) scenario, transmitting in a Primary Serving Cell (Pcell) or a Secondary Serving Cell (Scell), by a base station, a random access trigger message to a User Equipment (UE); transmitting in the Scell, by the UE, a PRACH; transmitting in the Pcell or the Scell, by the base station, a random access procedure message to the UE; and when the base station transmits, in the Pcell, the random access process message to the UE, detecting in the Pcell, by the UE, the downlink control information in a common search space within one subframe, or detecting, in both the Pcell and the Scell, the downlink control information in a common search space within one subframe; or when the base station transmits, in the Scell, the random access process message to the UE, detecting in both the Pcell and the Scell, by the UE, the downlink control information in a common search space within one subframe. - View Dependent Claims (2, 3, 5, 6, 7, 9, 10, 11, 12, 13, 14, 16, 26, 27, 28, 29, 30, 31)
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4. (canceled)
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8. (canceled)
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15. (canceled)
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17. (canceled)
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18. A system for transmitting a Physical Random Access Channel (PRACH), comprising a base station and a User Equipment (UE), wherein
the base station is configured to transmit, in a Primary Serving Cell (Pcell) or a Secondary Serving Cell (Scell), a random access trigger message to the UE in a CA scenario; -
the UE is configured to transmit, in the Scell, a PRACH; and the base station is further configured to transmit, in the Pcell or the Scell, a random access procedure message to the UE; and when the base station is configured to transmit, in the Pcell, the random access procedure message to the UE, the UE is further configured to;
detect, in the Pcell, the downlink control information in a common search space within one subframe, or detect, in both the Pcell and the Scell, the downlink control information in a common search space within one subframe;
orwhen the base station is configured to transmit, in the Scell, the random access procedure message to the UE, the UE is further configured to;
detect, in both the Pcell and the Scell, the downlink control information in a common search space within one subframe. - View Dependent Claims (19, 20, 22, 23, 24, 33)
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21. (canceled)
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25. (canceled)
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32. (canceled)
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34. (canceled)
Specification