Feedback for a system information request
Apparatuses, methods, and systems are disclosed for sending and/or receiving feedback for a system information request. One method includes transmitting information indicating a request for system information. The method includes monitoring, during a first predetermined time period, for a feedback response acknowledging that the request for the system information was received. The method includes indicating that a random access procedure is successfully completed in response to receiving the feedback response.
1. A method comprising:
transmitting information indicating a request for system information, wherein the information indicating the request for the system information comprises a physical random access channel preamble, the physical random access channel preamble indicates at least one specific system information message that a user equipment requests, and the physical random access channel preamble is selected out of a set of physical random access channel preambles used for requesting system information;
monitoring, during a first predetermined time period, for a feedback response acknowledging that the request for the system information was received, wherein the feedback response is part of a random access response message transmitted on a physical downlink shared channel; and
considering that a random access procedure is successfully completed in response to receiving the feedback response.
2. The method of claim 1 , wherein the feedback response comprises a physical random access channel preamble identifier corresponding to the physical random access channel preamble.
3. The method of claim 2 , wherein the feedback response acknowledging that the request for the system information was received is transmitted in a medium access control subheader comprising the physical random channel preamble identifier.
4. The method of claim 1 , wherein the feedback response is part of downlink control information.
5. The method of claim 1 , wherein a radio network temporary identifier is used to indicate the feedback response.
6. The method of claim 1 , wherein the feedback response is indicated by one or more fields of downlink control information set to one or more predefined values.
7. The method of claim 1 , wherein the information indicating the request for the system information comprises a bitmap indicating the requested system information.
8. The method of claim 7 , wherein the feedback response comprises information indicating the requested system information.
9. The method of claim 1 , wherein the feedback response is part of a contention resolution message during random access.
10. The method of claim 1 , wherein downlink scheduling information for the system information is transmitted with the feedback response.
11. An apparatus comprising:
a transmitter that transmits information indicating a request for system information, wherein the information indicating the request for the system information comprises a physical random access channel preamble, the physical random access channel preamble indicates at least one specific system information message that a user equipment requests, and the physical random access channel preamble is selected out of a set of physical random access channel preambles used for requesting system information;
a receiver that monitors, during a first predetermined time period, for a feedback response acknowledging that the request for the system information was received, wherein the feedback response is part of a random access response message transmitted on a physical downlink shared channel; and
a processor that considers that a random access procedure is successfully completed in response to receiving the feedback response.
12. The apparatus of claim 11 , wherein, in response to not receiving the feedback response:
the transmitter retransmitting the information indicating the request for the system information; and
the receiver monitors, during a second predetermined time period, for the feedback response acknowledging that the request for the system information was received.
13. The apparatus of claim 12 , wherein the transmitter retransmits the information indicating the request for the system information by retransmitting the information using increased power.
14. The apparatus of claim 12 , wherein the transmitter retransmits the information indicating the request for the system information by repeating transmitting information indicating the request for the system information up to a predetermined number of times.
15. The apparatus of claim 11 , wherein the processor does not set a cell radio network temporary identifier to a value in the feedback response.
16. A method comprising:
receiving information from a remote unit indicating a request for system information, wherein the information indicating the request for the system information comprises a physical random access channel preamble, the physical random access channel preamble indicates at least one specific system information message that a user equipment requests, and the physical random access channel preamble is selected out of a set of physical random access channel preambles used for requesting system information; and
transmitting a feedback response to the remote unit acknowledging that the request for the system information was received, wherein the feedback response is part of a random access response message transmitted on a physical downlink shared channel, and the remote unit considers that a remote access procedure is successfully completed in response to receiving the feedback response.
17. An apparatus comprising:
a receiver that receives information from a remote unit indicating a request for system information, wherein the information indicating the request for the system information comprises a physical random access channel preamble, the physical random access channel preamble indicates at least one specific system information message that a user equipment requests, and the physical random access channel preamble is selected out of a set of physical random access channel preambles used for requesting system information; and
a transmitter that transmits a feedback response to the remote unit acknowledging that the request for the system information was received, wherein the feedback response is part of a random access response message transmitted on a physical downlink shared channel, and the remote unit considers that a remote access procedure is successfully completed in response to receiving the feedback response.
18. The apparatus of claim 17 , wherein the transmitter transmits scheduling information corresponding to the system information.
19. The apparatus of claim 18 , wherein the transmitter transmits the system information based on the scheduling information.
20. The method of claim 3 , wherein the feedback response comprises a medium access control subheader containing a physical random access channel preamble identifier corresponding to the physical random access channel preamble indicating the request for the system information.
21. The method of claim 20 , wherein the feedback response message comprises only the medium access control subheader for a random access response without a medium access control payload for the random access response.
22. The apparatus of claim 11 , wherein the feedback response comprises a medium access control subheader containing a physical random access channel preamble identifier corresponding to the physical random access channel preamble indicating the request for the system information.
23. The apparatus of claim 22 , wherein the feedback response message comprises only the medium access control subheader for a random access response without a medium access control payload for the random access response.
24. The method of claim 16 , wherein the feedback response comprises a medium access control subheader containing a physical random access channel preamble identifier corresponding to the physical random access channel preamble indicating the request for the system information.
25. The method of claim 24 , wherein the feedback response message comprises only the medium access control subheader for a random access response without a medium access control payload for the random access response.
26. The apparatus of claim 17 , wherein the feedback response comprises a medium access control subheader containing a physical random access channel preamble identifier corresponding to the physical random access channel preamble indicating the request for the system information.
27. The apparatus of claim 26 , wherein the feedback response message comprises only the medium access control subheader for a random access response without a medium access control payload for the random access response.