Method for optimizing discontinuous reception in random access and scheduling request

1. A method for optimizing discontinuous reception mechanism in random access applied in E-UTRA network environment, with which a user equipment monitors PDCCH within a TTI window and is at active time to monitor the PDCCH, wherein during a contention based random access, the user equipment monitor the PDCCH at the active time when a contention resolution timer is running, and the user equipment monitors the PDCCH at the active time while the PDCCH indicating new transmission addressed to C-RNTI of the user equipment has not been received after successful receiving a random access response for a non-contention random access preamble during a non-contention based random access, wherein in the contention based random access, the method comprises the steps of:

(A) the user equipment sending a randomly selected contention random access preamble by an up-link;

(B) the user equipment receiving a random access response from a down-link, wherein the user equipment monitors the PDCCH for receiving the random access response within the TTI window;

(C) the user equipment sending its identity by the up-link; and

(D) the user equipment receiving a contention resolution message from the down-link, wherein the user equipment monitors the PDCCH at the active time for receiving the contention resolution message when the contention resolution timer is running.

2. The method as claimed in claim 1 , wherein in the contention based random access, the method further comprises the step of:

(E) when the user equipment successful receives its random access response within TTI window, the user equipment stops monitoring PDCCH until the contention resolution timer starts.

3. The method as claimed in claim 2 , wherein in the contention based random access, the method further comprises the step of:

(G) when the random access response for the contention random access preamble is not received within the TTI window, the user equipment stops monitoring PDCCH until expecting another said random access response for another preamble transmission reattempt.

4. The method as claimed in claim 1 , wherein in the contention based random access, the method further comprises the step of:

(F) when the contention resolution message is not received before expiration of the contention resolution timer, the user equipment stops monitoring the PDCCH until expecting another said random access response for another preamble transmission reattempt.

5. A method for optimizing discontinuous reception mechanism in scheduling request applied in E-UTRA network environment, with which a user equipment monitors PDCCH at active time, wherein in a scheduling request with non-dedicated scheduling request resource, the user equipment monitors PDCCH within a TTI window and is at the active time to monitor PDCCH when a contention resolution timer is running, and wherein the user equipment monitors the PDCCH at the active time while an up-link grant for the user equipment has not been received after a scheduling request has been sent in a dedicated scheduling request resource, wherein in the scheduling request with non-dedicated scheduling request resource, the method comprises the steps of:

(A) the user equipment triggering a scheduling request;

(B) the user equipment randomly selecting and sending a contention random access preamble by an up-link;

(C) the user equipment receiving a random access response from a down-link, wherein the user equipment monitors the PDCCH for receiving the random access response within the TTI window;

(D) the user equipment sending its identity by the up-link; and

(E) the user equipment receiving a contention resolution message from the down-link, wherein the user equipment monitors the PDCCH at the active time for receiving the contention resolution message when the contention resolution timer is running.

6. The method as claimed in claim 5 , wherein in the scheduling request with non-dedicated scheduling request resource, the method further comprises the step of:

(F) when the user equipment successful receives its random access response within the TTI window, the user equipment stops monitoring the PDCCH until the contention resolution timer starts.

7. The method as claimed in claim 5 , wherein in the scheduling request with non-dedicated scheduling request resource, the method further comprises the step of:

(G) when the user equipment fails contention resolution the user equipment stops monitoring the PDCCH until expecting another said random access response for another preamble transmission reattempt.

8. The method as claimed in claim 7 , wherein in the scheduling request with non-dedicated scheduling request resource, the method further comprises the step of:

(I) when the random access response for the contention random access preamble is not received within the TTI window, the user equipment stops monitoring the PDCCH until expecting another said random access response for another preamble transmission reattempt.

9. The method as claimed in claim 5 , wherein in the scheduling request with non-dedicated scheduling request resource, the method further comprises the step of:

(H) when the random access response for the contention random access preamble is not received within the TTI window, the user equipment stops monitoring the PDCCH until expecting another said random access response for another preamble transmission reattempt.

10. The method as claimed in claim 5 , wherein, in the step (A), the user equipment triggers the scheduling request with non-dedicated scheduling request resource for reposting a buffer status report.

11. A method for optimizing discontinuous reception mechanism in random access applied in E-UTRA network environment, with which a user equipment monitors PDCCH within a TTI window and is at active time to monitor the PDCCH, wherein during a contention based random access, the user equipment monitor the PDCCH at the active time when a contention resolution timer is running, and the user equipment monitors the PDCCH at the active time while the PDCCH indicating new transmission addressed to C-RNTI of the user equipment has not been received after successful receiving a random access response for a non-contention random access preamble during a non-contention based random access, wherein in the non-contention based random access, the method comprises the steps of:

(A) the user equipment receiving a random access preamble assignment by a down-link;

(B) the user equipment sending said non-contention random access preamble by an up-link;

(C) the user equipment receiving a random access response from the down-link, wherein the user equipment monitors the PDCCH for receiving the random access response; and

(D) the user equipment receiving the PDCCH indicating a new transmission addressed to C-RNTI of the user equipment, wherein the user equipment is at the active time to monitor the PDCCH for receiving the PDCCH addressed to the user equipment.

12. A method for optimizing discontinuous reception mechanism in scheduling request applied in E-UTRA network environment, with which a user equipment monitors PDCCH at active time, wherein in a scheduling request with non-dedicated scheduling request resource, the user equipment monitors PDCCH within a TTI window and is at the active time to monitor PDCCH when a contention resolution timer is running, and wherein the user equipment monitors the PDCCH at the active time while an up-link grant for the user equipment has not been received after a scheduling request has been sent in a dedicated scheduling request resource, wherein in the scheduling request with dedicated scheduling request resource, the method comprises the steps of:

(A) the user equipment triggering a scheduling request;

(B) the user equipment transmitting a scheduling request by the uplink; and

(C) the user equipment receiving an up-link grant for new transmission by a down-link, wherein the user equipment monitors the PDCCH at the active time for receiving the up-link grant.

13. The method as claimed in claim 12 , wherein, in step (A), the user equipment triggers the scheduling request with dedicated scheduling request resource for reporting a buffer status report.