Method and apparatus for controlling a handover between UTRA R6 cells and R7 cells
A method and apparatus for controlling an optimization of handover procedures between universal terrestrial radio access (UTRA) release 6 (R6) cells and UTRA release 7 (R7) cells are disclosed. When a wireless transmit/receive unit (WTRU) is moving between an R6 cell and an R7 cell, or between R7 cells, a handover is initiated from a source Node-B to a target Node-B. In the R7 cell, the enhanced medium access control (MAC) functionality including flexible radio link control (RLC) protocol data unit (PDU) size and high speed MAC (MAC-hs) segmentation and multiplexing of different priority queues are supported. After the handover, a MAC layer and/or an RLC layer are reconfigured or reset based on functionality supported by the target Node-B.
1. A wireless transmit/receive unit (WTRU) comprising circuitry, including a processor and a memory storing instructions executable by the processor, configured to implement:
a radio resource control (RRC) unit in software and/or firmware; and
a medium access control (MAC) unit in software and/or firmware,
wherein the RRC unit is configured to:
receive an RRC message for notifying the WTRU of a medium access control (MAC) reconfiguration occurring at a serving high speed downlink shared channel (HS-DSCH) cell;
send, to the MAC unit, a high speed MAC (MAC-hs) reset indicator on condition that the RRC message includes (i) a downlink (DL) MAC-hs reset indicator, and (ii) an indication of enhanced MAC-hs (MAC-ehs) configuration; and
send, to the MAC unit, a MAC-ehs reset indicator on condition that the RRC message includes (i) a DL MAC-hs reset indicator, and (ii) an indication of MAC-hs configuration; and
wherein the MAC unit configured to:
perform a MAC-hs reset on condition that the MAC-hs reset indicator is received from the RRC unit; and
perform a MAC-ehs reset on condition that the MAC-ehs reset indicator is received from the RRC unit.
2. The WTRU of claim 1 , wherein the circuitry is configured to determine from the RRC message that the MAC reconfiguration from MAC-hs to MAC-ehs or from MAC-ehs to MAC-hs has been initiated.
3. The WTRU of claim 1 , wherein the MAC unit is configured to perform MAC-hs or MAC-ehs reconfiguration in accordance with the indication of MAC-ehs configuration or the indication of MAC-hs configuration, respectively.
4. The WTRU of claim 3 , wherein the MAC unit is configured to perform the MAC-hs or MAC-ehs reset prior to performing the MAC-hs or MAC-ehs reconfiguration.
5. The WTRU of claim 3 , wherein an unspecified behavior of the WTRU occurs if the MAC-hs or MAC-ehs reset is not included in the RRC message and a MAC-hs or a MAC-ehs reconfiguration has been performed.
6. The WTRU of claim 1 , wherein an unspecified behavior of the WTRU occurs:
on condition that the RRC message includes (i) the DL MAC-hs reset indicator, and (ii) an indication of a current configuration of a MAC unit of the WTRU.
7. A method implemented in a wireless transmit/receive unit (WTRU), the method comprising:
receiving a radio resource control (RRC) message for notifying the WTRU of a medium access control (MAC) reconfiguration occurring at a serving high speed downlink shared channel (HS-DSCH) cell;
performing a high speed medium access control (MAC-hs) reset on condition that the RRC message includes (i) a downlink (DL) MAC-hs reset indicator, and (ii) an indication of enhanced MAC-hs (MAC-ehs) configuration; and
performing a MAC-ehs reset on condition that the RRC message includes (i) a DL MAC-hs reset indicator, and (ii) an indication of MAC-hs configuration.
8. The method of claim 7 , wherein the WTRU determines from the RRC message that the MAC reconfiguration from MAC-hs to MAC-ehs or from MAC-ehs to MAC-hs been initiated.
9. The method of claim 7 , further comprising:
performing MAC-hs or MAC-ehs reconfiguration in accordance with the indication of MAC-ehs configuration or the indication of MAC-hs configuration, respectively.
10. The method of claim 9 , wherein the WTRU performs the MAC-hs or MAC-ehs reset prior to performing the MAC-hs or MAC-ehs reconfiguration.
11. The method of claim 9 , wherein an unspecified behavior of the WTRU occurs if the MAC-hs or MAC-ehs reset is not included in the RRC message and the MAC-hs or MAC-ehs reconfiguration has been performed.
12. The method of claim 7 , wherein an unspecified behavior of the WTRU occurs:
on condition that the RRC message includes (i) the DL MAC-hs reset indicator, and (ii) an indication of a current configuration of a MAC unit of the WTRU.
13. The WTRU of claim 1 , wherein the indication of enhanced MAC-hs (MAC-ehs) configuration included in the RRC message is an indication of a header format indicative of the MAC-ehs configuration.
14. The WTRU of claim 1 , wherein the indication of MAC-hs (MAC-hs) configuration included in the RRC message is an indication of a header format indicative of the MAC-hs configuration.
15. The WTRU of claim 1 , wherein the indication of enhanced MAC-hs (MAC-ehs) configuration included in the RRC message is an indication of a header format indicative of the MAC-ehs configuration; and wherein the indication of MAC-hs (MAC-hs) configuration included in the RRC message is an indication of a header format indicative of the MAC-hs configuration.
16. The method of claim 7 , wherein the indication of enhanced MAC-hs (MAC-ehs) configuration included in the RRC message is an indication of a header format indicative of the MAC-ehs configuration.
17. The method of claim 7 , wherein the indication of MAC-hs (MAC-hs) configuration included in the RRC message is an indication of a header format indicative of the MAC-hs configuration.
18. The method of claim 7 , wherein the indication of enhanced MAC-hs (MAC-ehs) configuration included in the RRC message is an indication of a header format indicative of the MAC-ehs configuration; and wherein the indication of MAC-hs (MAC-hs) configuration included in the RRC message is an indication of a header format indicative of the MAC-hs configuration.
19. The WTRU of claim 1 , wherein the RRC unit is configured to:
send any of the MAC-hs reset indicator and the MAC-ehs reset indicator to the MAC unit in a primitive message.