System and method for coverage enhancements of broadcast channels
A base station transmits and a UE detects broadcast information when the UE operates in a Coverage Enhancement (CE) mode. The base station transmits repetitions of signaling conveying broadcast information in one or more subframes of each frame in a quadruple of frames. The transmission is intermittent in time. To detect the broadcast information, the UE blindly combines and decodes the repetitions of signaling assuming their existence. The base station informs the pattern for the intermittent transmissions of the signaling to UEs connected to the base station or to other base stations.
1. A method, comprising:
receiving, in first frequency resources, first broadcast signaling that provides a master information block (MIB), wherein the MIB indicates second frequency resources; and
receiving, in the second frequency resources, control signaling scheduling second broadcast signaling that provides a system information block (SIB),
wherein the SIB includes a bitmap with size equal to a size of a set of time resources for the first broadcast signaling, and
wherein each element of the bitmap indicates presence or absence for the first broadcast signaling in a corresponding time resource.
2. The method of claim 1 , wherein the set of time resources for the first broadcast signaling are for broadcast signaling in a first cell.
3. The method of claim 1 , wherein time resources for reception of the first broadcast signaling are according to a configuration from a predetermined set of configurations, and wherein the frequency resources include resource blocks, the resource blocks each including a number of subcarriers.
4. The method of claim 1 , wherein a first time resource for the first broadcast signaling is determined as a function of a system frame number.
5. The method of claim 1 , further comprising:
receiving a physical downlink shared channel (PDSCH) in a time resource from the set of time resources and over the second frequency resources.
6. The method of claim 1 , further comprising:
receiving a parameter indicating a periodicity for the set of time resources.
7. A user equipment (UE), comprising
a receiver configured to receive, in first frequency resources, first broadcast signaling that provides a master information block (MIB), wherein the MIB indicates second frequency resources,
wherein the receiver is further configured to receive, in the second frequency resources, control signaling scheduling second broadcast signaling that provides a system information block (SIB),
wherein the SIB includes a bitmap with size equal to a size of a set of time resources for the first broadcast signaling, and
wherein each element of the bitmap indicates presence or absence for the first broadcast signaling in a corresponding time resource.
8. The UE of claim 7 , wherein the set of time resources for the first broadcast signaling are for broadcast signaling in a first cell.
9. The UE of claim 7 , wherein time resources for reception of the first broadcast signaling are according to a configuration from a predetermined set of configurations, and wherein the frequency resources include resource blocks, the resource blocks each including a number of subcarriers.
10. The UE of claim 7 , wherein a first time resource for the first broadcast signaling is determined as a function of a system frame number.
11. The UE of claim 7 , wherein the receiver is configured to receive a physical downlink shared channel (PDSCH) in a time resource from the set of time resources and over the second frequency resources.
12. The UE of claim 7 , wherein the receiver is configured to receive a parameter indicating a periodicity for the set of time resources.
13. A base station (BS), comprising
a transmitter configured to transmit, in first frequency resources, first broadcast signaling that provides a master information block (MIB), wherein the MIB indicates second frequency resources,
wherein the transmitter is further configured to transmit, in the second frequency resources, control signaling scheduling second broadcast signaling that provides a system information block (SIB),
wherein the SIB includes a bitmap with size equal to a size of a set of time resources for the first broadcast signaling, and
wherein each element of the bitmap indicates presence or absence for the first broadcast signaling in a corresponding time resource.
14. The BS of claim 13 , wherein the set of time resources for the first broadcast signaling are for broadcast signaling in a first cell.
15. The BS of claim 13 , wherein time resources for transmission of the first broadcast signaling are according to a configuration from a predetermined set of configurations, and wherein the frequency resources include resource blocks, the resource blocks each including a number of subcarriers.
16. The BS of claim 13 , wherein a first time resource for the first broadcast signaling is determined as a function of a system frame number.
17. The BS of claim 13 , wherein the transmitter is configured to transmit a physical downlink shared channel (PDSCH) in a time resource from the set of time resources and over the second frequency resources.