METHOD AND APPARATUS FOR MULTIMEDIA BROADCAST MULTICAST SERVICE (MBMS) CONTROL INFORMATION DELIVERY
Apparatuses and methods for providing multimedia broadcast multicast service (MBMS) on carriers of a new carrier type (NCT) are described herein. A user equipment (UE) may transmit a message to indicate an interest in receiving MBMS transmissions on a target cell that operates on a first carrier of a first carrier type on which cell-specific reference signals (CRSs) are suppressed at one or more downlink subframes of a downlink frame. The UE may receive, in response to transmitting the message, identification information of a notification cell on which to receive MBMS control information change notification for the target cell. The UE may receive MBMS traffic from the target cell using the MBMS control information received from the notification cell. The UE may receive the MBMS control information on a second carrier of a second carrier type different from the first carrier type.
1 .- 22 . (canceled)
23 . A user equipment (UE) for operating in a network, the UE comprising physical layer circuitry to:
transmit a message to indicate an interest in receiving multimedia broadcast multicast service (MBMS) transmissions on a target cell that operates on a first carrier of a first carrier type on which cell-specific reference signals (CRSs) are suppressed at one or more downlink subframes of a downlink radio frame;
receive, in response to transmitting the message, identification information of a notification cell on which to receive MBMS control information change notification for the target cell; and
receive MBMS traffic from the target cell using the MBMS control information received from the notification cell, the MBMS traffic being received on the first carrier and the MBMS control information being received on a second carrier of a second carrier type different from the first carrier type.
24 . The UE of claim 23 , wherein the first carrier type is a new carrier type (NCT) implemented in accordance with a standard of the 3rd Generation Partnership Project (3GPP) family of standards and wherein the second carrier type is a legacy carrier type on which CRSs are not suppressed.
25 . The UE of claim 24 , wherein an identity of the notification cell is received in a Radio Resource Control (RRC) message transmitted in accordance with a standard of the 3GPP family of standards.
26 . The UE of claim 25 , wherein the physical layer circuitry is further arranged to receive a change notification to notify of a change of the MBMS control information associated with MBMS traffic transmitted on NCT.
27 . The UE of claim 26 , wherein the physical layer circuitry is further arranged receive the change notification by decoding a physical downlink control channel (PDCCH) of the notification cell, using a cyclic redundancy check (CRC) scrambled with an MBMS radio network temporary identifier (M-RNTI) of the target cell, the M-RNTI and notification cell being configured using RRC signaling from an evolved NodeB.
28 . The UE of claim 27 , wherein the PDCCH is configurable by a parameter indicating a radio frame offset, a repetition coefficient, and a subframe index for a change notification transmitted on the PDCCH.
29 . The UE of claim 26 , wherein the physical layer circuitry is further arranged to receive the change notification in a media access control (MAC) control element (CE).
30 . The UE of claim 26 , wherein the physical layer circuitry is further arranged to: receive a plurality of change notifications for a plurality of MBMS serving cells, at least two of the plurality of change notifications being received in a same subframe of a change notification period and each of the at least two change notifications being scrambled based on a corresponding M-RNTI of the respective MBMS serving cell, a number of M-RNTIs used by the UE being equal to a number of serving cells of a first carrier type configured by a higher layer for MBMS.
31 . The UE of claim 26 , further comprising:
a memory to store resource assignment information representative of multicast search space (MSS) information on a PDCCH of the second carrier type, and wherein the physical layer circuitry is further arranged to receive change notifications using the MSS.
32 . The UE of claim 23 , wherein the UE is further configured to receive MBMS traffic from the target cell according to a higher-layer configured parameter that indicates a number of symbols, from a start of a subframe, shall constitute a non-multicast broadcast single frequency network (MBSFN) region.
33 . An evolved NodeB (eNodeB) for operating in a network, the eNodeB comprising:
a transceiver arranged to
receive an indication that a user equipment (UE) desires to receive multimedia broadcast multicast service (MBMS) transmissions from a secondary cell (SCell) that operates on a first carrier of a first carrier type on which cell-specific reference signals (CRSs) are suppressed at one or more downlink subframes of a downlink frame; and
provide notification cell information, responsive to receiving the indication, which indicates an identity of a notification cell in the network, other than the SCell, that has been configured to provide MBMS control information of the SCell.
34 . The eNodeB of claim 33 , wherein the transceiver is arranged to receive notification cell information in a transmission of a second carrier of a second carrier type different from the first carrier type.
35 . The eNodeB of claim 34 , wherein the first carrier type is a new carrier type (NCT) implemented in accordance with a standard of the 3rd Generation Partnership Project (3GPP) family of standards and the second carrier type is a legacy carrier type and wherein the second carrier type is a legacy carrier type on which CRSs are not suppressed.
36 . The eNodeB of claim 34 , wherein the transceiver is further arranged to:
transmit, on a physical downlink control channel (PDCCH), change notifications to notify of a change of the MBMS control information for the MBMS traffic transmitted on the SCell.
37 . The eNodeB of claim 36 , wherein the transceiver is further arranged to transmit a plurality of MBMS control information change notifications according to a time division duplex (TDD) scheme.
38 . A method performed by a user equipment (UE), the method comprising:
transmitting a message to indicate an interest in receiving multimedia broadcast multicast service (MBMS) transmissions on a target cell, the target cell transmitting on a first carrier of a new carrier type (NCT) on which cell-specific reference signals (CRSs) are suppressed at one or more downlink subframes of a downlink radio frame;
receiving, responsive to the message and in a Radio Resource Control (RRC) message transmitted in accordance with a standard of the 3rd Generation Partnership Project (3GPP) family of standards, an identity of a notification cell, different from the target cell, on which to receive MBMS control information and MBMS control information change notifications of the target cell; and
receiving MBMS traffic from the target cell using the MBMS control information received from the notification cell, the MBMS traffic being received on the first carrier and the MBMS control information being received on a second carrier of a legacy carrier type different from the NCT on which CRSs are not suppressed.
39 . The method of claim 38 , further comprising:
receiving, in a physical downlink control channel (PDCCH) of the notification cell or in a media access control (MAC) control element, a change notification to notify of a change of the MBMS control information corresponding to the target cell.
40 . The method of claim 39 , further comprising:
receiving a plurality of change notifications for a plurality of MBMS serving cells, wherein at least two of the plurality of change notifications are received in a same subframe of a change notification period and each of the at least two change notifications are scrambled based on a MBMS radio network temporary identifier (M-RNTI) of the respective MBMS serving cell.
41 . The method of claim 38 , wherein the MBMS traffic is received in a multicast-broadcast single-frequency network (MBSFN) from a plurality of cells that use NCT, and the method further comprises receiving a message on a physical control format indicator channel (PCFICH) that indicates that a non-MBSFN region shall not be included in at least one MBSFN subframe of the MBMS traffic.
42 . A method performed by an evolved NodeB (eNodeB) for operating in a network, the method comprising:
receiving an indication that a user equipment (UE) desires to receive multimedia broadcast multicast service (MBMS) transmissions from a secondary cell (SCell) that operates on a first carrier of a new carrier type (NCT) on which cell-specific reference signals (CRSs) are suppressed at one or more downlink subframes of a downlink frame;
receiving notification cell information in a transmission of a second carrier of a second carrier type different from the NCT and on which CRSs are not suppressed; and
providing notification cell information, responsive to receiving the indication, which indicates an identity of a notification cell in the network, other than the SCell, that has been configured to provide MBMS control information of the SCell.
43 . The method of claim 42 , further comprising:
transmitting, on a physical downlink control channel (PDCCH), change notifications to notify of a change of the MBMS control information for the MBMS traffic transmitted on the SCell.
44 . The method of claim 43 , wherein the eNodeB transmits change notifications for the SCell and at least one other cell according to a time division duplex (TDD) scheme.