Methods and systems for beamformed system information transmission
A method and apparatus for use in a wireless transmit receive unit (WTRU) for receiving system information. A WTRU receives a broadcast signal from a gNB, wherein the broadcast signal includes system information. The WTRU determines configuration information associated with the received system information and the WTRU transmits a signal to the gNB using the determined configuration information associated with the received system information. The configuration information includes an indication regarding whether the WTRU is able to include any one or a combination of a request signal or a feedback signal in the signal transmitted to the gNB. The transmitted signal to the gNB may include a preamble that indicates system information block (SIB) request information. The transmitted signal to the gNB may include a control field that indicates additional SIB request information. The transmitted signal may provide feedback for the received system information. The WTRU then receives system information from the gNB in response to the transmitted signal. The received system information in response to the transmitted signal is one or more SIBs.
1. A method performed by a wireless transmit/receive unit (WTRU), the method comprising:
receiving, from a network device, a broadcast signal having configuration information, wherein the configuration information indicates a group of preambles;
transmitting, to the network device based on the configuration information, a transmission including a preamble from the group of preambles and a request message requesting one or more system information blocks (SIBs);
receiving, from the network device, a random access response (RAR) in response to the transmission; and
receiving, from the network device, at least one of the requested one or more SIBs in response to the request message.
2. The method of claim 1 , wherein the configuration information includes an indication regarding whether the WTRU is able to include a feedback signal with the transmitted preamble or request message.
3. The method of claim 1 , wherein the transmitted preamble or request message includes a control field that indicates additional SIB request information.
4. The method of claim 1 , further comprising:
determining whether the received broadcast signal satisfies a reception criterion, wherein the broadcast signal is received from the network device on one or more directional beams.
5. The method of claim 4 , wherein the transmitted preamble or request message includes a feedback signal that provides feedback for the one or more directional beams, the feedback including beam information associated with the WTRU and an indication whether the received broadcast signal satisfies the reception criterion.
6. The method of claim 5 , wherein the reception criterion includes a detected energy of the received broadcast signal being above a predetermined threshold.
7. The method of claim 5 , wherein the reception criterion includes a cyclic redundancy check (CRC) associated with the received broadcast signal.
8. A wireless transmit/receive unit (WTRU) comprising:
a transceiver; and
a processor operatively coupled to the transceiver; wherein:
the transceiver is configured to receive, from a network device, a broadcast signal having configuration information, wherein the configuration information indicates a group of preambles;
the transceiver and the processor configured to transmit, to the network device based on the configuration information, a transmission including a preamble from the group of preambles and a request message regarding one or more system information blocks (SIBs);
the transceiver and the processor configured to receive, from the network device, a random access response (RAR) in response to the transmission; and
the transceiver and the processor configured to receive, from the network device, at least one of the requested one or more SIBs in response to the request message.
9. The WTRU of claim 8 , wherein the configuration information includes an indication regarding whether the WTRU is able to include a feedback signal with the transmitted preamble or request message.
10. The WTRU of claim 8 , wherein the transmitted preamble or request message includes a control field that indicates additional SIB request information.
11. The WTRU of claim 8 , wherein the processor is further configured to determine whether the received broadcast signal satisfies a reception criterion, wherein the broadcast signal is received from the network device on one or more directional beams.
12. The WTRU of claim 11 , wherein the transmitted preamble or request message includes a feedback signal that provides feedback for the one or more directional beams, the feedback including beam information associated with the WTRU and an indication whether the received broadcast signal satisfies the reception criterion.
13. The WTRU of claim 12 , wherein the reception criterion includes a detected energy of the received broadcast signal being above a predetermined threshold.
14. The WTRU of claim 12 , wherein the reception criterion includes a cyclic redundancy check (CRC) associated with the received broadcast signal.