Node and method for downlink communications scheduling
Example embodiments presented herein are directed towards a base station and corresponding method for scheduling a downlink broadcast transmission using PDSCH. The base station is also configured to provide an OFDM PDSCH to a wireless terminal, which monitors ePDCCH for receiving downlink control data. Thus, by applying such a symbol, a wireless terminal that monitors ePDCCH and a wireless terminal that monitors PDCCH may receive the same downlink broadcast transmission on PDSCH. Example embodiments are also directed towards a wireless terminal for receiving such downlink broadcast transmissions.
1. A method in a base station for scheduling a downlink broadcast transmission using a Physical Downlink Shared Channel (PDSCH) wherein an Orthogonal Frequency Division Multiplexing (OFDM) PDSCH start symbol identifier is used for identifying a start of said broadcast transmission, said base station being comprised in a wireless communications network, the method comprising:
selecting an OFDM PDSCH start symbol for the start of the broadcast transmission,
wherein the OFDM PDSCH start symbol is based only on a system bandwidth.
2. The method of claim 1 , wherein the OFDM PDSCH start symbol is one of a number of predefined values and the value is selected based on the system bandwidth.
3. The method of claim 1 , where a size of a control region is zero symbols and the OFDM PDSCH start symbol is zero.
4. The method of claim 1 , further comprising configuring a Physical Control Format Indicator Channel (PCFICH) control format indicator (CFI) value, in a subframe in which downlink broadcast transmissions are sent, to be equal to the selected OFDM PDSCH start symbol.
5. The method of claim 4 , further comprising configuring a Physical Control Format Indicator Channel (PCFICH) control format indicator (CFI) value, in a subframe in which downlink broadcast transmissions are sent, to be equal to the OFDM PDSCH start symbol, wherein the OFDM PDSCH start symbol is a radio resource control (RRC) configured value.
6. The method of claim 1 , further comprising transmitting the downlink broadcast transmission, the downlink broadcast transmission including a second OFDM start symbol identifying the start of a PDSCH region for connected mode signaling and/or an enhanced Physical Downlink Control Channel (ePDCCH) region.
7. The method of claim 6 , further comprising transmitting, to the at least a first user equipment, an ePDCCH, based on the second OFDM start symbol.
8. A base station for scheduling a downlink broadcast transmission using a Physical Downlink Shared Channel (PDSCH) wherein an Orthogonal Frequency Division Multiplexing (OFDM) PDSCH start symbol is used for identifying a start of said broadcast transmission, said base station being comprised in a wireless communications network, the base station comprising:
radio circuitry configured to transmit the broadcast transmission; and
processing circuitry configured to control the radio circuitry and to select an OFDM PDSCH start symbol for the start of the broadcast transmission, wherein the OFDM PDSCH start symbol is based only on a system bandwidth.
9. The base station of claim 8 , wherein the OFDM PDSCH start symbol is one of a number of predefined values and the value is selected based on the system bandwidth.
10. The base station of claim 8 , where a size of a control region is zero symbols and the OFDM PDSCH start symbol is zero.
11. The base station of claim 8 , further comprising configuring a Physical Control Format Indicator Channel (PCFICH) control format indicator (CFI) value, in a subframe in which downlink broadcast transmissions are sent, to be equal to the selected OFDM PDSCH start symbol.
12. The base station of claim 11 , wherein the processing circuit is configured to configure a Physical Control Format Indicator Channel (PCFICH) control format indicator (CFI) value, in a subframe in which downlink broadcast transmissions are sent, to be equal to the OFDM PDSCH start symbol, wherein the OFDM PDSCH start symbol is a radio resource control (RRC) configured value.
13. The base station of claim 8 , wherein the processing circuit is configured to control the radio circuitry to transmit the downlink broadcast transmission, the downlink broadcast transmission including a second OFDM start symbol identifying the start of a PDSCH region for connected mode signaling and/or an enhanced Physical Downlink Control Channel (ePDCCH) region.
14. The base station of claim 13 , wherein the processing circuit is configured to control the radio circuitry to transmit, to the at least a first user equipment, an ePDCCH, based on the second OFDM start symbol.
15. A method in a wireless terminal for receiving downlink broadcast transmissions in a Physical Downlink Shared Channel (PDSCH) said wireless terminal being comprised in a wireless communications network, the method comprising:
monitoring an enhanced Physical Downlink Control Channel (ePDCCH) for downlink control information;
determining an Orthogonal Frequency Division Multiplexing (OFDM) PDSCH start symbol for a start of the downlink broadcast transmissions, wherein said OFDM PDSCH start symbol is based only on a system bandwidth.
16. The method of claim 15 , wherein the start symbol for the start of the downlink broadcast transmission is one of a number of values, and the value is determined based on the system bandwidth.
17. The method of claim 15 , where a size of a control region is zero symbols and the OFDM PDSCH start symbol is zero.
18. The method of claim 15 , wherein the method further comprises receiving the downlink broadcast transmission, the downlink broadcast transmission including a second OFDM start symbol identifying the start of a PDSCH region for connected mode signaling and/or an enhanced Physical Downlink Control Channel (ePDCCH) region.
19. The method of claim 18 , wherein the method further comprises receiving an ePDCCH, based on the second OFDM PDSCH start symbol.
20. A wireless terminal for receiving downlink broadcast transmissions in a Physical Downlink Shared Channel (PDSCH), the wireless terminal comprising:
radio circuitry configured to receive downlink broadcast transmissions on the PDSCH;
processing circuitry configured to control the radio circuitry to monitor an enhanced Physical Downlink Control Channel (ePDCCH) for downlink control information, to determine an Orthogonal Frequency Division Multiplexing (OFDM) PDSCH start symbol for identifying a start of said downlink broadcast transmissions, wherein said OFDM PDSCH start symbol is based only on a system bandwidth, and to control the radio circuitry to receive downlink broadcast transmissions based on the OFDM PDSCH start symbol.
21. The wireless terminal of claim 20 , wherein the start symbol for the start of the downlink broadcast transmission is one of a number of values, and the value is determined based on the system bandwidth.
22. The wireless terminal of claim 20 , where a size of a control region is zero symbols and the OFDM PDSCH start symbol is zero.
23. The wireless terminal of claim 20 , wherein the processing circuitry is configured to receive the downlink broadcast transmission, the downlink broadcast transmission including a second OFDM start symbol identifying the start of a PDSCH region for connected mode signaling and/or an enhanced Physical Downlink Control Channel (ePDCCH) region.
24. The wireless terminal of claim 23 , wherein the processing circuitry is configured to receive an ePDCCH, based on the second OFDM start symbol.
25. The method of claim 1 , further comprising transmitting the downlink broadcast transmission to a reduced bandwidth wireless terminal.