Radio resource control messaging for dual connectivity networks
A 3GPP LTE protocol enhancement may realize the full benefit of dual connectivity in Long Term Evolution (LTE) networks by providing a mechanism to carry Radio Resource Control (RRC) messages and/or Information Elements (IE)s from a Secondary Evolved Node B (SeNB) to User Equipment (UE) via Master Evolved Node B (MeNB) RRC messages. Novel downlink (DL) Common Control Channel (CCCH) and Dedicated Control Channel (DCCH) messages, and augmented messages having Information Elements (IE)s for relaying RRC messages from a SeNB to a UE via a MeNB, are defined. Modifications to ASN.1 program coding of LTE 3 rd Generation Partnership Project specifications to enable RRC messages from the MeNB to relay RRC information from the SeNB to the UE are provided. In one embodiment, the UE receives, from a MeNB, an RRC message comprising information relayed from a SeNB and interprets the RRC message for control channel and radio resource configuration information from the SeNB.
1. A User Equipment (UE) comprising a processor and transceiver configured to:
receive, from a Master Evolved Node B (MeNB), a Radio Resource Control (RRC) message comprising control channel and radio resource configuration information, wherein the control channel and the radio resource configuration information originates from a Secondary Evolved Node B (SeNB) and is relayed to the UE via the RRC message of the MeNB;
extract the relayed SeNB control channel and radio resource configuration information from the RRC message; and
configure the UE for dual connectivity with the MeNB and the SeNB, according to the extracted SeNB control channel and radio resource configuration information, to allow the UE to utilize radio resources of both the MeNB and the SeNB.
2. The UE of claim 1 further configured to receive the RRC message, wherein the RCC message comprises a “senbMessage” having a “DL-CCCH-SeNBMessageType” message type for relaying the control channel and radio resource configuration information.
3. The UE of claim 1 further configured to receive the RRC message comprising a “senbMessage” having a “DL-DCCH-SeNBMessageType” message type for relaying the control channel and radio resource configuration information.
4. The UE of claim 1 further configured to receive the RRC message comprising a Download-Common Control Channel (DL-CCCH) message augmented with a “C2-Senb” Information Element for relaying control channel and radio resource configuration information.
5. The UE of claim 1 further configured to receive the RRC message comprising a Download Dedicated Control Channel (DL-DCCH) message augmented with a “C2-Dual-Senb” Information Element for relaying the control channel and radio resource configuration information.
6. The UE claim of 1 further configured to receive the RRC message on a downlink common control channel having a populated “c1-Senb” Information Element for relaying UE dual connectivity configuration information comprising a “RRCConnectionReestablishment” parameter, a “RRCConnectionReestablishmentReject” parameter, a “RRCConnectionReject” parameter or a “RRCConnectionSetup” parameter of the control channel and radio resource configuration information.
7. The UE claim of 1 further configured to receive the RRC message on a downlink dedicated control channel having a populated “c1-Senb” Information Element for relaying UE dual connectivity configuration information comprising a “DLInformationTransfer” parameter, a “RRCConnectionReconfiguration” parameter, a “RRCConnectionRelease” parameter, a “SecurityModeCommand” parameter, a “UECapabilityEnquiry” parameter, a “CounterCheck” parameter, a “UEInformationRequest-r9” parameter, or a “RNReconfiguration-r10” parameter of the control channel and radio resource configuration information.
8. The UE of claim 1 further configured to receive the RRC message on a downlink common control channel having a populated “C2-Senb” Information Element for relaying UE dual connectivity configuration information comprising a “RRCConnectionReestablishment” parameter, a “RRCConnectionReestablishmentReject” parameter, a “RRCConnectionReject” parameter, or a “RRCConnectionSetup” parameter of the control channel and radio resource configuration information.
9. The of claim 1 further configured to receive the RRC message on a downlink dedicated control channel having a populated “C2-Dual-Senb” Information Element for relaying UE dual connectivity configuration information comprising a “DLInformationTransfer” parameter, a “RRCConnectionReconfiguration” parameter, a “RRCConnectionRelease” parameter, a “SecurityModeCommand” parameter, a “UECapabilityEnquiry” parameter, “CounterCheck”, a “UEInformationRequest-r9” parameter, or a “RNReconfiguration-r10” parameter of the control channel and radio resource configuration information.
10. The UE of claim 1 further configured to receive the RRC message, wherein the RRC message comprises control channel and radio resource configuration information for configuring the UE when traffic and data are offloaded from a large cell to a small cell.
11. A method performed by User Equipment (UE), the method comprising:
receiving a Radio Resource Control (RRC) message comprising control channel and radio resource configuration information, wherein the control channel and the radio resource configuration information originates at a Secondary Evolved Node B (SeNB) and is relayed to the UE from the SeNB via the RRC message of another Evolved Node B (eNB); and
configuring the UE for dual connectivity with the SeNB and another Evolved Node B, according to the received control channel and radio resource configuration information.
12. The method of claim 11 wherein the received RRC message of the another eNB comprises a container for relaying the control channel and radio resource configuration information from the SeNB.
13. The method of claim 11 wherein the RRC message comprising the control channel and radio resource configuration information is received from a Master Evolved Node B (MeNB).
14. The method of claim 11 wherein the control channel and radio resource configuration information comprises information for a Downlink-Dedicated Control Channel (DL-DCCH).
15. The method of claim 11 wherein the control channel and radio resource configuration information comprises information for a Downlink-Common Control Channel (DL-CCCH).
16. A non-transitory computer readable storage device including instructions stored thereon, which when executed by one or more processors of a User Equipment (UE), cause the UE to perform operations to:
receive, from a Master Evolved Node B (MeNB), a Radio Resource Control (RRC) message comprising control channel and radio resource configuration information, wherein the control channel and the radio resource configuration information originates at a Secondary Evolved Node B (SeNB) and relayed to the UE from the SeNB via the RRC message of the MeNB;
extract the relayed control channel and radio resource configuration information from the received RRC message; and
configure the UE for simultaneous connectivity with the MeNB and the SeNB based on the extracted information.
17. The non-transitory computer readable storage device of claim 16 wherein the received RRC message comprises a container for relaying the control channel and radio resource configuration information from the SeNB.
18. A Master Evolved Node B (MeNB) comprising hardware processing circuitry configured to:
receive, from a Secondary Evolved Node B (SeNB), a Radio Resource Control (RRC) message comprising control channel and radio resource configuration information for a User Equipment; and
relay the control channel and radio resource configuration information received in the SeNB RRC message to the User Equipment in an RRC message of the MeNB, wherein the User Equipment is configured for dual connectivity with the MeNB and the SeNB.
19. The MeNB of claim 18 further configured to extract a “c1_Senb” message comprising the control channel and radio resource configuration information from the received RRC message.
20. The MeNB of claim 18 further configured to extract a “C2-Senb” Information Element comprising the control channel and radio resource configuration information from the received RRC message.
21. The MeNB of claim 18 further configured to extract a “C2-Dual-Senb” Information Element comprising the relayed control channel and radio resource configuration information from the received RRC message.