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 a bitmap, wherein the bitmap has a size equal to a size of a set of predetermined time resources for broadcast signaling over a predetermined bandwidth (BW), and wherein each element of the bitmap indicates presence or absence for the broadcast signaling in a corresponding time resource; and
receiving a physical downlink shared channel (PDSCH) in a first time resource that includes a time resource from the set of predetermined time resources and over a BW that includes part of the predetermined BW,
wherein the PDSCH reception includes the part of the predetermined BW in the time resource when the bitmap indicates absence for the broadcast signaling in the time resource, and
wherein the PDSCH reception excludes the part of the predetermined BW in the time resource when the bitmap indicates presence for the broadcast signaling in the time resource.
2. The method of claim 1 , wherein the bitmap is included in a reception of a PDSCH conveying a system information block.
3. The method of claim 1 , further comprising:
receiving a parameter indicating a periodicity for the occurrence of the set of predetermined time resources.
4. The method of claim 1 , further comprising:
receiving a physical downlink control channel (PDCCH),
wherein the PDCCH reception is over a first number of first symbols of a time resource unit when the time resource unit includes a time resource for the broadcast signaling,
wherein the PDCCH reception is over a second number of first symbols of a time resource unit when the time resource unit does not include a time resource for the broadcast signaling,
wherein the first number of symbols is smaller than the second number of symbols, and
wherein a first symbol for the broadcast signaling is the first symbol after the first number of first symbols.
5. The method of claim 1 , further comprising:
receiving a system information block according to a configuration of time resources or frequency resources indicated by a value of a field in the broadcast signaling, wherein the value is from a set of values having one-to-one mapping to a set of predetermined configurations of respective time resources or frequency resources.
6. A method, comprising:
receiving, in predetermined frequency resources of a cell having a bandwidth (BW), first broadcast signaling conveying a master information block (MIB) that includes a field having a value from a set of values with one-to-one mapping to a set of predetermined configurations of time resources; and
receiving second broadcast signaling conveying a system information block in time resources corresponding to a configuration from the set of predetermined configurations indicated by the value of the field in the MIB.
7. The method of claim 6 , wherein the configuration corresponds to a number of repetitions for the second broadcast signaling.
8. The method of claim 6 , wherein MIB information bits are for a first type of user equipments (UEs) and for a second type of UEs, and wherein the MIB information bits for the first type of UEs are a subset of the MIB information bits for the second type of UEs.
9. The method of claim 6 , wherein a reception of the second broadcast signaling is in frequency resources determined as a function of a physical identity of the cell and of the BW and exclude the predetermined frequency resources.
10. The method of claim 6 , wherein when a reception of a control channel or of a data channel is in a time resource for the first broadcast signaling or for the second broadcast signaling, the reception of the control channel or of the data channel excludes frequency resources for the first broadcast signaling or for the second broadcast signaling, respectively.
11. A user equipment (UE), comprising:
a receiver configured to receive
a bitmap, wherein the bitmap has a size equal to a size of a set of predetermined time resources for broadcast signaling over a predetermined bandwidth (BW), and wherein each element of the bitmap indicates presence or absence for the broadcast signaling in a corresponding time resource, and
a physical downlink shared channel (PDSCH) in a first time resource that includes a time resource from the set of predetermined time resources and over a BW that includes part of the predetermined BW,
wherein the PDSCH reception includes the part of the predetermined BW in the time resource when the bitmap indicates absence for the broadcast signaling in the time resource, and
wherein the PDSCH reception excludes the part of the predetermined BW in the time resource when the bitmap indicates presence for the broadcast signaling in the time resource.
12. The UE of claim 11 , wherein the bitmap is included in a reception of a PDSCH conveying a system information block.
13. The UE of claim 11 , further comprising a receiver for receiving a parameter indicating a periodicity for the occurrence of the set of predetermined time resources.
14. The UE of claim 11 , wherein the receiver is configured to receive a physical downlink control channel (PDCCH),
wherein the PDCCH reception is over a first number of first symbols of a time resource unit when the time resource unit includes a time resource for the broadcast signaling,
wherein the PDCCH reception is over a second number of first symbols of a time resource unit when the time resource unit does not include a time resource for the broadcast signaling,
wherein the first number of symbols is smaller than the second number of symbols, and
wherein a first symbol for the broadcast signaling is the first symbol after the first number of first symbols.
15. The UE of claim 11 , wherein the receiver is configured to receive a system information block according to a configuration of time resources or frequency resources indicated by a value of a field in the broadcast signaling, wherein the value is from a set of values having one-to-one mapping to a set of predetermined configurations of respective time resources or frequency resources.
16. A user equipment (UE), comprising:
a receiver configured to receive:
first broadcast signaling, in predetermined frequency resources of a cell having a bandwidth (BW), conveying a master information block (MIB) that includes a field having a value from a set of values with one-to-one mapping to a set of predetermined configurations of time resources, and
second broadcast signaling conveying a system information block in time resources corresponding to a configuration from the set of predetermined configurations indicated by the value of the field in the MIB.
17. The UE of claim 16 , wherein the configuration corresponds to a number of repetitions for the second broadcast signaling.
18. The UE of claim 16 , wherein MIB information bits are for a first type of user equipments (UEs) and for a second type of UEs, and wherein the MIB information bits for the first type of UEs are a subset of the MIB information bits for the second type of UEs.
19. The UE of claim 16 , wherein a reception of the second broadcast signaling is in frequency resources determined as a function of a physical identity of the cell and of the BW and exclude the predetermined frequency resources.
20. The UE of claim 16 , wherein, when a reception of a control channel or of a data channel is in a time resource for the first broadcast signaling or for the second broadcast signaling, the reception of the control channel or of the data channel excludes frequency resources for the first broadcast signaling or for the second broadcast signaling, respectively.