Method and mobile terminal for performing random access
A random access channel (RACH) procedure includes a mobile terminal receiving from a network a message that indicates a RACH preamble for the mobile terminal. The terminal transmits the RACH preamble to the network and then receives a RACH response from the network. The terminal monitors a downlink channel according to a discontinuous reception (DRX) active time for radio resource allocation information for a data transmission by the terminal. The DRX active time specifies a time until the radio resource allocation information for the data transmission is indicated.
1. A mobile terminal comprising:
communication circuitry; and
processing circuitry is configured to perform a random access channel (RACH) procedure using the communications circuitry including:
receiving from a network a random access channel (RACH) preamble message that indicates a RACH preamble for the mobile terminal;
transmitting the RACH preamble to the network;
receiving a RACH response from the network; and
monitoring a downlink channel according to a discontinuous reception (DRX) active time for radio resource allocation information for a data transmission by the mobile terminal,
wherein the DRX active time specifies a time until the radio resource allocation information for the data transmission is indicated.
2. The mobile terminal in claim 1 , wherein the RACH preamble is a dedicated preamble and is explicitly signaled from the network.
3. The mobile terminal in claim 1 , wherein the preamble message is part of a handover message.
4. The mobile terminal in claim 1 , wherein the RACH response is received as a part of a media access control (MAC) protocol data unit (PDU).
5. The mobile terminal in claim 1 , wherein the RACH response includes at least one of an uplink grant for uplink radio resources, a temporary cell identifier, and a value for time synchronization adjustment.
6. The mobile terminal in claim 5 , wherein the temporary cell identifier includes a Cell-Radio Network Temporary Identifier (C-RNTI), and
wherein the monitoring includes monitoring a Physical Downlink Control Channel (PDCCH) until reception of the C-RNTI that indicates the radio resource allocation information for the data transmission.
7. The mobile terminal in claim 1 , wherein the mobile terminal is configured to wake up from an power saving state at a start of the DRX active time, and wherein the mobile terminal need not monitor the downlink channel when the DRX active time expires.
8. The mobile terminal in claim 1 , wherein the DRX active time denotes a time from after receiving the RACH response to a time when an indication of the radio resource allocation information for the data transmission is received.
9. The mobile terminal in claim 1 , wherein the DRX active time denotes a time from after receiving the RACH response to a time when scheduling information for the data transmission is received.
10. The mobile terminal in claim 1 , wherein the downlink channel is a physical downlink control channel (PDCCH), and wherein the processing circuitry is configured, using the communications circuitry, to receive the RACH preamble on the PDCCH.
11. A method for a mobile terminal comprising:
performing a random access channel (RACH) procedure using communications circuitry including:
receiving from a network a random access channel (RACH) preamble message that indicates a RACH preamble for the mobile terminal;
transmitting the RACH preamble to the network;
receiving a RACH response from the network; and
monitoring a downlink channel according to a discontinuous reception (DRX) active time for radio resource allocation information for a data transmission by the mobile terminal,
wherein the DRX active time specifies a time until the radio resource allocation information for the data transmission is indicated.
12. The method in claim 11 , wherein the RACH preamble is a dedicated preamble and is explicitly signaled from the network.
13. The method in claim 11 , wherein the preamble message is part of a handover message.
14. The method in claim 11 , wherein the RACH response is received as a part of a media access control (MAC) protocol data unit (PDU).
15. The method in claim 11 , wherein the RACH response includes at least one of an uplink grant for uplink radio resources, a temporary cell identifier, and a value for time synchronization adjustment.
16. The method in claim 15 , wherein the temporary cell identifier includes a Cell-Radio Network Temporary Identifier (C-RNTI), and
wherein the monitoring includes monitoring a Physical Downlink Control Channel (PDCCH) until reception of the C-RNTI that indicates the radio resource allocation information for the data transmission.
17. The method in claim 11 , wherein the mobile terminal wakes up from an power saving state at a start of the DRX active time, and wherein the mobile terminal need not monitor the downlink channel when the DRX active time expires.
18. The method in claim 11 , wherein the DRX active time denotes a time from after receiving the RACH response to a time when an indication of the radio resource allocation information for the data transmission is received.
19. The method in claim 11 , wherein the DRX active time denotes a time from after receiving the RACH response to a time when scheduling information for the data transmission is received.
20. The method in claim 11 , wherein the downlink channel is a physical downlink control channel (PDCCH), and wherein the RACH preamble is received on the PDCCH.