Cyclic prefix in evolved multimedia broadcast multicast service with high transmit power
A method, an apparatus, and a computer program product for wireless communication are provided in which a cyclic prefix duration for orthogonal frequency division multiple access symbols is determined. The cyclic prefix duration is calculated to reduce inter-symbol interference associated with a transmitter located at a distance that is more than 5 kilometers from one or more user equipment. Subcarrier spacing is determined and a symbol size for the symbols is determined. One or more of an enhanced Node B and a user equipment is configured with the cyclic prefix duration, the subcarrier spacing and the symbol size.
1. A method of wireless communication, comprising:
determining a cyclic prefix duration for orthogonal frequency division multiple access (OFDMA) symbols to be transmitted wirelessly in a multi-media broadcast over a single frequency network (MBSFN) area, wherein the cyclic prefix duration is calculated to accommodate a propagation delay between an evolved Node B (eNB) and one or more user equipment (UE) or other eNBs in the MBSFN that has a duration that exceeds a predefined duration;
determining a subcarrier spacing for the MBSFN;
determining a transmission time interval (TTI) corresponding to an MBSFN subframe transmitted in the MBSFN;
determining, based on the cyclic prefix duration, the subcarrier spacing, and the TTI, a distributed pattern for reference signals in an MBSFN subframe configuration; and
providing one or more of the eNB and the UE with the MBSFN subframe configuration for communicating the MBSFN subframe.
2. The method of claim 1 , wherein the distribution pattern is further based on separation between neighboring reference signals within the MBSFN subframe.
3. The method of claim 1 , further comprising configuring a plurality of eNBs with the distribution pattern, wherein the eNBs participate in the same MBSFN.
4. The method of claim 1 , wherein the cyclic prefix duration is greater than 33 microseconds.
5. The method of claim 1 , wherein the subcarrier spacing is less than 7.5 kHz.
6. The method of claim 1 , further comprising determining a symbol duration for the OFDMA symbols, wherein the distribution pattern is further based on the symbol duration.
7. The method of claim 6 , wherein configuring the symbol duration includes reducing bandwidth to obtain a sustainable FFT size.
8. A method of wireless communication, comprising:
determining a cyclic prefix duration for orthogonal frequency division multiple access (OFDMA) symbols to be transmitted wirelessly in a multi-media broadcast over a single frequency network (MBSFN) area, wherein the cyclic prefix duration is calculated to accommodate a propagation delay between an evolved Node B (eNB) and one or more user equipment (UE) or other eNBs in the MBSFN that has a duration that exceeds a predefined duration;
determining a subcarrier spacing for the MBSFN;
determining a transmission time interval (TTI) corresponding to a subframe transmitted in the MBSFN; and
providing one or more of the eNB and the UE with a distribution pattern for reference signals in the subframe based on the cyclic prefix duration, the subcarrier spacing, and the TTI, wherein the TTI is 1 ms when the subcarrier spacing is 7.5 MHz or more.
9. A method of wireless communication, comprising:
determining a cyclic prefix duration for orthogonal frequency division multiple access (OFDMA) symbols to be transmitted wirelessly in a multi-media broadcast over a single frequency network (MBSFN) area, wherein the cyclic prefix duration is calculated to accommodate a propagation delay between an evolved Node B (eNB) and one or more user equipment (UE) or other eNBs in the MBSFN that has a duration that exceeds a predefined duration;
determining a subcarrier spacing for the MBSFN;
determining a transmission time interval (TTI) corresponding to a subframe transmitted in the MBSFN; and
providing one or more of the eNB and the UE with a distribution pattern for reference signals in the subframe based on the cyclic prefix duration, the subcarrier spacing, and the TTI, wherein the TTI is greater than 1 ms when the subcarrier spacing is less than 7.5 kHz.
10. An apparatus for wireless communication, comprising:
means for determining a cyclic prefix duration for orthogonal frequency division multiple access (OFDMA) symbols to be transmitted wirelessly in a multi-media broadcast over a single frequency network (MBSFN) area, wherein the cyclic prefix duration is calculated to reduce inter-symbol interference associated with a propagation delay between an evolved Node B (eNB) and one or more user equipment (UE) or other eNBs in the MBSFN that has a duration that exceeds a predefined duration;
means for determining a subcarrier spacing for the MBSFN;
means for determining a transmission time interval (TTI) corresponding to an MBSFN subframe transmitted in the MBSFN;
means for determining, based on the cyclic prefix duration, the subcarrier spacing, and the TTI, a distributed pattern for reference signals in a MBSFN subframe configuration; and
means for providing one or more of the eNB and the UE with the MBSFN subframe configuration for communicating the MBSFN subframe.
11. The apparatus of claim 10 , wherein the distribution pattern is further based on separation between neighboring reference signals within the MBSFN subframe.
12. The apparatus of claim 10 , further comprising means for configuring a plurality of eNBs with the distribution pattern, wherein the eNBs participate in the same MBSFN.
13. The apparatus of claim 10 , wherein the cyclic prefix duration is greater than 33 microseconds.
14. The apparatus of claim 10 , wherein the subcarrier spacing is less than 7.5 kHz.
15. The apparatus of claim 10 , further comprising means for determining a symbol duration for the OFDMA symbols, wherein the distribution pattern is further based on the symbol size.
16. The apparatus of claim 15 , wherein the means for determining the symbol duration reduces bandwidth to obtain a sustainable FFT size.
17. An apparatus for wireless communication, comprising:
means for determining a cyclic prefix duration for orthogonal frequency division multiple access (OFDMA) symbols to be transmitted wirelessly in a multi-media broadcast over a single frequency network (MBSFN) area, wherein the cyclic prefix duration is calculated to reduce inter-symbol interference associated with a propagation delay between an evolved Node B (eNB) and one or more user equipment (UE) or other eNBs in the MBSFN that has a duration that exceeds a predefined duration;
means for determining a subcarrier spacing for the MBSFN;
means for determining a transmission time interval (TTI) corresponding to a subframe transmitted in the MBSFN; and
means for providing one or more of the eNB and the UE with a distribution pattern for reference signals in the subframe based on the cyclic prefix duration, the subcarrier spacing, and the TTI, wherein the transmission time interval (TTI) is 1 ms when the subcarrier spacing is 7.5 MHz or more.
18. An apparatus for wireless communication, comprising:
means for determining a cyclic prefix duration for orthogonal frequency division multiple access (OFDMA) symbols to be transmitted wirelessly in a multi-media broadcast over a single frequency network (MBSFN) area, wherein the cyclic prefix duration is calculated to reduce inter-symbol interference associated with a propagation delay between an evolved Node B (eNB) and one or more user equipment (UE) or other eNBs in the MBSFN that has a duration that exceeds a predefined duration;
means for determining a subcarrier spacing for the MBSFN;
means for determining a transmission time interval (TTI) corresponding to a subframe transmitted in the MBSFN; and
means for providing one or more of the eNB and the UE with a distribution pattern for reference signals in the subframe based on the cyclic prefix duration, the subcarrier spacing, and the TTI, wherein the TTI is greater than 1 ms when the subcarrier spacing is less than 7.5 kHz.
19. An apparatus for wireless communication, comprising:
a processing system configured to:
determine a cyclic prefix duration for orthogonal frequency division multiple access (OFDMA) symbols to be transmitted wirelessly in a multi-media broadcast over a single frequency network (MBSFN) area, wherein the cyclic prefix duration is calculated to reduce inter-symbol interference associated with a propagation delay between an evolved Node B (eNB) and one or more user equipment (UE) or other eNBs in the MBSFN that has a duration that exceeds a predefined duration;
determine a subcarrier spacing for the MBSFN;
determine a transmission time interval (TTI) corresponding to an MBSFN subframe transmitted in the MBSFN;
determine, based on the cyclic prefix duration, the subcarrier spacing, and the TTI, a distributed pattern for reference signals in an MBSFN subframe configuration; and
provide one or more of the eNB and the UE with the MBSFN subframe configuration for communicating the MBSFN subframe.
20. The apparatus of claim 19 , wherein the distribution pattern is further based on separation between neighboring reference signals within the MBSFN subframe.
21. The apparatus of claim 19 , wherein the processing system is configured to configure a plurality of eNBs with the distribution pattern, wherein the eNBs participate in the same MBSFN.
22. The apparatus of claim 19 , wherein the cyclic prefix duration is greater than 33 microseconds.
23. The apparatus of claim 19 , wherein the subcarrier spacing is less than 7.5 kHz.
24. The apparatus of claim 19 , wherein the processing system is configured to determine a symbol duration for the OFDMA symbols, wherein the distribution pattern is further based on the symbol duration.
25. The apparatus of claim 24 , wherein the symbol duration is configured by reducing bandwidth to obtain a sustainable FFT size.
26. An apparatus for wireless communication, comprising:
a processing system configured to:
determine a cyclic prefix duration for orthogonal frequency division multiple access (OFDMA) symbols to be transmitted wirelessly in a multi-media broadcast over a single frequency network (MBSFN) area, wherein the cyclic prefix duration is calculated to reduce inter-symbol interference associated with a propagation delay between an evolved Node B (eNB) and one or more user equipment (UE) or other eNBs in the MBSFN that has a duration that exceeds a predefined duration;
determine a subcarrier spacing for the MBSFN;
determine a transmission time interval (TTI) corresponding to a subframe transmitted in the MBSFN; and
provide one or more of the eNB and the UE with a distribution pattern for reference signals in the subframe based on the cyclic prefix duration, the subcarrier spacing, and the TTI, wherein the TTI is 1 ms when the subcarrier spacing is 7.5 MHz or more.
27. An apparatus for wireless communication, comprising:
a processing system configured to:
determine a cyclic prefix duration for orthogonal frequency division multiple access (OFDMA) symbols to be transmitted wirelessly in a multi-media broadcast over a single frequency network (MBSFN) area, wherein the cyclic prefix duration is calculated to reduce inter-symbol interference associated with a propagation delay between an evolved Node B (eNB) and one or more user equipment (UE) or other eNBs in the MBSFN that has a duration that exceeds a predefined duration;
determine a subcarrier spacing for the MBSFN;
determine a transmission time interval (TTI) corresponding to a subframe transmitted in the MBSFN; and
provide one or more of the eNB and the UE with a distribution pattern for reference signals in the subframe based on the cyclic prefix duration, the subcarrier spacing, and the TTI, wherein the TTI is greater than 1 ms when the subcarrier spacing is less than 7.5 kHz.
28. A non-transitory computer-readable medium comprising code for:
determining a cyclic prefix duration for orthogonal frequency division multiple access (OFDMA) symbols to be transmitted wirelessly in a multi-media broadcast over a single frequency network (MBSFN) area, wherein the cyclic prefix duration is calculated to reduce inter-symbol interference associated with a propagation delay between an evolved Node B (eNB) and one or more user equipment (UE) or other eNBs in the MBSFN that has a duration that exceeds a predefined duration;
determining a subcarrier spacing for the MBSFN;
determining a transmission time interval (TTI) corresponding to an MBSFN subframe transmitted in the MBSFN;
determining, based on the cyclic prefix duration, the subcarrier spacing, and the TTI, a distributed pattern for reference signals in an MBSFN subframe configuration; and
providing one or more of the eNB and the UE with the MBSFN subframe configuration for communicating the MBSFN subframe.
29. A method of wireless communication, comprising:
determining configuration information for a subframe to be wirelessly transmitted in a multi-media broadcast over a single frequency network (MBSFN), the subframe being an MBSFN subframe, the configuration information defining a distribution pattern for reference signals in the subframe, wherein the distribution pattern is based on a cyclic prefix duration for orthogonal frequency division multiple access (OFDMA) symbols to be transmitted wirelessly in the MBSFN, a subcarrier spacing for the MBSFN, and a transmission time interval (TTI) corresponding to the subframe;
transmitting the distribution pattern to at least one user equipment (UE) in the MBSFN; and
transmitting at least one MBSFN subframe to the UE in accordance with the distribution pattern.
30. The method of claim 29 , wherein the cyclic prefix duration is calculated to accommodate a propagation delay between the UE and an evolved Node B (eNB) that has a duration that exceeds a predefined duration.
31. The method of claim 29 , wherein the distribution pattern is further based on separation between neighboring reference signals within the subframe.
32. An apparatus for wireless communication, comprising:
means for determining configuration information for a subframe to be wirelessly transmitted in a multi-media broadcast over a single frequency network (MBSFN), the subframe being an MBSFN subframe, the configuration information defining a distribution pattern for reference signals in the subframe, wherein the distribution pattern is based on a cyclic prefix duration for orthogonal frequency division multiple access (OFDMA) symbols to be transmitted wirelessly in the MBSFN, a subcarrier spacing for the MBSFN, and a transmission time interval (TTI) corresponding to the subframe;
means for transmitting the distribution pattern to at least one user equipment (UE) in the MBSFN; and
means for transmitting at least one MBSFN subframe to the UE in accordance with the distribution pattern.
33. The apparatus of claim 32 , wherein the cyclic prefix duration is calculated to accommodate a propagation delay between the UE and an evolved Node B (eNB) that has a duration that exceeds a predefined duration.
34. The apparatus of claim 32 , wherein the distribution pattern is further based on separation between neighboring reference signals within the subframe.
35. An apparatus for wireless communication, comprising:
a processing system configured to:
determine configuration information for a subframe to be wirelessly transmitted in a multi-media broadcast over a single frequency network (MBSFN), the subframe being an MBSFN subframe, the configuration information defining a distribution pattern for reference signals in the subframe, wherein the distribution pattern is based on a cyclic prefix duration for orthogonal frequency division multiple access (OFDMA) symbols to be transmitted wirelessly in the MBSFN, a subcarrier spacing for the MBSFN, and a transmission time interval (TTI) corresponding to the subframe;
transmit the distribution pattern to at least one user equipment (UE) in the MBSFN; and
transmit at least one MBSFN subframe to the UE in accordance with the distribution pattern.
36. The apparatus of claim 35 , wherein the cyclic prefix duration is calculated to accommodate a propagation delay between the UE and an evolved Node B (eNB) that has a duration that exceeds a predefined duration.
37. The apparatus of claim 35 , wherein the distribution pattern is further based on separation between neighboring reference signals within the subframe.
38. A non-transitory computer-readable medium comprising code for:
determining configuration information for a subframe to be wirelessly transmitted in a multi-media broadcast over a single frequency network (MBSFN), the subframe being an MBSFN subframe, the configuration information defining a distribution pattern for reference signals in the subframe, wherein the distribution pattern is based on a cyclic prefix duration for orthogonal frequency division multiple access (OFDMA) symbols to be transmitted wirelessly in the MBSFN, a subcarrier spacing for the MBSFN, and a transmission time interval (TTI) corresponding to the subframe;
transmitting the distribution pattern to at least one user equipment (UE) in the MBSFN; and
transmitting at least one MBSFN subframe to the UE in accordance with the distribution pattern.
39. A method of wireless communication, comprising:
determining configuration information for a subframe to be wirelessly transmitted in a multi-media broadcast over a single frequency network (MBSFN), the subframe being an MBSFN subframe, the configuration information defining a distribution pattern for reference signals in the subframe, wherein the distribution pattern is based on a cyclic prefix duration for orthogonal frequency division multiple access (OFDMA) symbols to be transmitted wirelessly in the MBSFN, a subcarrier spacing for the MBSFN, and a transmission time interval (TTI) corresponding to the subframe; and
receiving at least one MBSFN subframe in accordance with the distribution pattern.
40. The method of claim 39 , wherein the distribution pattern is further based on separation between neighboring reference signals within the subframe.
41. An apparatus for wireless communication, comprising:
means for determining configuration information for a subframe to be wirelessly transmitted in a multi-media broadcast over a single frequency network (MBSFN), the subframe being an MBSFN subframe, the configuration information defining a distribution pattern for reference signals in the subframe, wherein the distribution pattern is based on a cyclic prefix duration for orthogonal frequency division multiple access (OFDMA) symbols to be transmitted wirelessly in the MBSFN, a subcarrier spacing for the MBSFN, and a transmission time interval (TTI) corresponding to the subframe; and
means for receiving at least one MBSFN subframe in accordance with the distribution pattern.
42. The apparatus of claim 41 , wherein the distribution pattern is further based on separation between neighboring reference signals within the subframe.
43. An apparatus for wireless communication, comprising:
a processing system configured to:
determine configuration information for a subframe to be wirelessly transmitted in a multi-media broadcast over a single frequency network (MBSFN), the subframe being an MBSFN subframe, the configuration information defining a distribution pattern for reference signals in the subframe, wherein the distribution pattern is based on a cyclic prefix duration for orthogonal frequency division multiple access (OFDMA) symbols to be transmitted wirelessly in the MBSFN, a subcarrier spacing for the MBSFN, and a transmission time interval (TTI) corresponding to the subframe; and
receive at least one MBSFN subframe in accordance with the distribution pattern.
44. The apparatus of claim 43 , wherein the distribution pattern is further based on separation between neighboring reference signals within the subframe.
45. A non-transitory computer-readable medium comprising code for:
determining configuration information for a subframe to be wirelessly transmitted in a multi-media broadcast over a single frequency network (MBSFN), the subframe being an MBSFN subframe, the configuration information defining a distribution pattern for reference signals in the subframe, wherein the distribution pattern is based on a cyclic prefix duration for orthogonal frequency division multiple access (OFDMA) symbols to be transmitted wirelessly in the MBSFN, a subcarrier spacing for the MBSFN, and a transmission time interval (TTI) corresponding to the subframe; and
receiving at least one MBSFN subframe in accordance with the distribution pattern.