Transmission of first and second buffer status information messages in a wireless network
A wireless transmit/receive unit (WTRU) transmits a first buffer status information message over an uplink shared channel with buffered data and a second buffer status information message over the uplink shared channel with buffered data. The second buffer status information message may have less bits and use a different format than the first buffer status information message. The WTRU may also transmit a scheduling request without buffered data on a condition of not have a scheduling grant. The WTRU may initiate, subsequent to a predetermined number of subframes after transmission of the first buffer status information message, transmission of another first buffer status information message.
1. A method performed by a wireless transmit/receive unit (WTRU), the method comprising:
transmitting, by the WTRU, power headroom information;
transmitting, by the WTRU, a first buffer status information message over an uplink shared channel with buffered data, wherein the first buffer status information message indicates an amount of data buffered;
transmitting, by the WTRU, a second buffer status information message over the uplink shared channel with buffered data, wherein the second buffer status information message has less bits and is a different format than the first buffer status information message;
transmitting, by the WTRU on a condition that the WTRU does not have a scheduling grant and is time synchronized with a network, a scheduling request without buffered data; and
initiating, by the WTRU subsequent to a predetermined number of subframes after transmission of the first buffer status information message, transmission of another first buffer status information message.
2. The method of claim 1 , wherein the second buffer status information message is transmitted in response to not having enough available bits for the first buffer status information message.
3. The method of claim 1 , wherein the first buffer status information message is transmitted in a full version uplink scheduling request.
4. The method of claim 1 further comprising:
receiving, by the WTRU, an allocation of resources based on the first buffer status information message.
5. The method of claim 1 further comprising: receiving, by the WTRU, an allocation of another scheduling grant based on the first buffer status information message.
6. The method of claim 1 , wherein the second buffer status information message is selected in response to a period of WTRU inactivity.
7. The method of claim 1 , wherein the WTRU transmits the first buffer status information message to a Node-B as layer 1 (L1) or layer 2 (L2) control signaling or higher layer signaling over an uplink (UL) shared control channel.
8. A wireless transmit/receive unit (WTRU) comprising: a transmitter configured to transmit power headroom information; the transmitter further configured to transmit a first buffer status information message over an uplink shared channel with buffered data, wherein the first buffer status information message indicates an amount of data buffered; the transmitter is further configured to transmit a second buffer status information message over the uplink shared channel with buffered data, wherein the second buffer status information message has less bits and is a different format than the first buffer status information message; the transmitter further configured to transmit, on a condition that the WTRU does not have a scheduling grant and is time synchronized with a network, a scheduling request without buffered data; and a processor configured to initiate, subsequent to a predetermined number of subframes after transmission of the first buffer status information message, transmission of another first buffer status information message.
9. The WTRU of claim 8 , wherein the second buffer status information message is transmitted in response to not having enough available bits for the first buffer status information message.
10. The WTRU of claim 8 , wherein the first buffer status information message is transmitted in a full version uplink scheduling request.
11. The WTRU of claim 8 further comprising:
a receiver configured to receive an allocation of resources based on the first buffer status information message.
12. The WTRU of claim 8 further comprising: a receiver configured to receive an allocation of a another scheduling grant based on the first buffer status information message.
13. The WTRU of claim 8 , wherein the second buffer status information message is selected in response to a period of WTRU inactivity.
14. The WTRU of claim 8 , wherein the WTRU transmits the first buffer status information message to a Node-B as layer 1 (L1) or layer 2 (L2) control signaling or higher layer signaling over an uplink shared control channel.
15. The method of claim 1 , wherein on a condition that channel quality indicator (CQI) or acknowledgement (ACK)/negative acknowledgement (NACK) bits are to be transmitted, the scheduling request is transmitted with the CQI or the ACK/NACK bits.
16. The method of claim 1 , wherein a format of the second buffer status information message includes information that would be included in the first buffer status information message but omits certain status information.
17. The WTRU of claim 8 , wherein on a condition that channel quality indicator (CQI) or acknowledgement (ACK)/negative acknowledgement (NACK) bits are to be transmitted, the scheduling request is transmitted with the CQI or the ACK/NACK bits.
18. The WTRU of claim 8 , wherein a format of the second buffer status information message includes information that would be included in the first buffer status information message but omits certain status information.