Physical downlink shared channel (PDSCH) protection

• US 8,897,236 B2
• Filed: 03/24/2011
• Issued: 11/25/2014
• Est. Priority Date: 03/26/2010
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Yoo, Taesang, Luo, Tao, Wei, Yongbin, Malladi, Durga Prasad
• Primary Examiner(s): Shah, Chirag
• Assistant Examiner(s): REDDIVALAM, SRINIVASA R
• Application Number:
  US13/071,145
• Publication Number:
  US 20110235601A1
• Time in Patent Office: 1,342 Days
• Field of Search: None
• US Class Current: 370/329
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0073 Allocation arrangements that take into account other cell interferences for intercell interference mitigation or co-ordination in orthogonal multiplex systems H04J11/005
• CPC Class Codes: H04W 72/541 using the level of interference

Abstract

According to certain aspects, resource blocks used for physical downlink shared channel (PDSCH) transmissions may be allocated in a manner to manage interference in neighboring cells. According to certain aspects, one or more guard RBs may be utilized when transmitting PDSCH in a first cell an effort to reduce interference by transmissions in a second cell.

Claims

1. A method for wireless communication in a wireless communications network in which at least a first base station of a first cell and a second base station of a second cell share resource blocks (RBs) via a frequency division multiplexing (FDM) scheme, the method comprising:

identifying, by the first base station, a set of RBs for transmitting a physical downlink shared channel (PDSCH), wherein the second base station is scheduled to limit transmissions using the identified set of RBs;

identifying one or more guard RBs surrounding the identified set of RBs; and

transmitting the PDSCH using the identified RBs with limited or no transmissions by either the first or second base stations in the guard RBs;

wherein;

the identified set of RBs are a distributed resource allocation; and

the guard RBs comprise one or more RBs on each side of one or more different portions of the identified set of RBs.

2. The method of claim 1, wherein:

the wireless communications network comprises a heterogeneous network; and

the first and second cells are of different power class types.

3. The method of claim 1, further comprising:

negotiating with the second base station to identify the guard RBs.

4. The method of claim 1, wherein the use of guard RBs when transmitting PDSCH is mandated such that the first base station does not need to signal the number of guard RBs to a UE.

5. The method of claim 1, wherein a UE determines, based on an existence or absence of guard RBs used when transmitting the PDSCH, whether to use all or a subset of the set of RBs allocated for the PDSCH for decoding the PDSCH.

6. The method of claim 1, wherein a UE determines, based on an existence or absence of guard RBs used when transmitting the PDSCH, whether to use a broadband or a narrowband channel estimation.

7. The method of claim 1, wherein the number of guard RBs is configurable via radio resource control (RRC) signaling.

8. The method of claim 1, wherein the number of guard RBs is dependent on the number of RBs in the identified set of RBs.

9. The method of claim 1, wherein transmitting the PDSCH comprises transmitting at least one of:

a system information block (SIB), a paging message, or a response message msg2.

10. A method for wireless communication in a system in which at least a first base station of a first cell and a second base station of a second cell share resource blocks (RBs) via a frequency division multiplexing (FDM) scheme, the method comprising:

receiving, from the first base station, a set of RBs allocated for a physical downlink shared channel (PDSCH), wherein the second base station is scheduled to limit transmissions using the identified set of RBs; and

decoding the PDSCH using only a subset of the set of RBs allocated for the PDSCH, wherein the subset does not include one or more RBs at either edge of the set of RBs allocated for the PDSCH;

wherein decoding the PDSCH using only a subset of the set of RBs allocated for the PDSCH comprises puncturing logarithmic likelihood ratios (LLRs) for the one or more RBs at either edge of the set of RBs allocated for the PDSCH.

11. The method of claim 10, wherein:

the wireless communications network comprises a heterogeneous network; and

the first and second cells are of different power class types.

12. The method of claim 10, further comprising receiving, from the first base station, an allocation of an increased number of RBs to compensate for the decoding using only a subset of the set of RBs allocated for the PDSCH.

13. The method of claim 10, further comprising determining, based on an existence or absence of guard RBs used when transmitting the PDSCH, whether to use all or a subset of the set of RBs allocated for the PDSCH for decoding the PDSCH.

14. An apparatus for wireless communication in a wireless communications network in which at least a first base station of a first cell and a second base station of a second cell share resource blocks (RBs) via a frequency division multiplexing (FDM) scheme, the apparatus comprising:

means for identifying a set of RBs for transmitting a physical downlink shared channel (PDSCH), wherein the second base station is scheduled to limit transmissions using the identified set of RBs;

means for identifying one or more guard RBs surrounding the identified set of RBs; and

means for transmitting the PDSCH using the identified RBs with limited or no transmissions by either the first or second base stations in the guard RBs;

wherein;

the identified set of RBs are a distributed resource allocation; and

the guard RBs comprise one or more RBs on each side of one or more different portions of the identified set of RBs.

15. The apparatus of claim 14, wherein:

the wireless communications network comprises a heterogeneous network; and

the first and second cells are of different power class types.

16. The apparatus of claim 14, further comprising:

means for negotiating with the second base station to identify the guard RBs.

17. The apparatus of claim 14, wherein the use of guard RBs when transmitting PDSCH is mandated such that the first base station does not need to signal the number of guard RBs to a UE.

18. The apparatus of claim 14, wherein a UE determines, based on an existence or absence of guard RBs used when transmitting the PDSCH, whether to use all or a subset of the set of RBs allocated for the PDSCH for decoding the PDSCH.

19. The apparatus of claim 14, wherein a UE determines, based on an existence or absence of guard RBs used when transmitting the PDSCH, whether to use a broadband or a narrowband channel estimation.

20. The apparatus of claim 14, wherein the number of guard RBs is configurable via radio resource control (RRC) signaling.

21. The apparatus of claim 14, wherein the number of guard RBs is dependent on the number of RBs in the identified set of RBs.

22. The apparatus of claim 14, wherein the means for transmitting the PDSCH comprises means for transmitting at least one of:

a system information block (SIB), a paging message, or a response message msg2.

23. An apparatus for wireless communication in a system in which at least a first base station of a first cell and a second base station of a second cell share resource blocks (RBs) via a frequency division multiplexing (FDM) scheme, the apparatus comprising:

means for receiving, from the first base station, a set of RBs allocated for a physical downlink shared channel (PDSCH), wherein the second base station is scheduled to limit transmissions using the identified set of RBs; and

means for decoding the PDSCH using only a subset of the set of RBs allocated for the PDSCH, wherein the subset does not include one or more RBs at either edge of the set of RBs allocated for the PDSCH;

wherein decoding the PDSCH using only a subset of the set of RBs allocated for the PDSCH comprises puncturing logarithmic likelihood ratios (LLRs) for the one or more RBs at either edge of the set of RBs allocated for the PDSCH.

24. The apparatus of claim 23, wherein:

the wireless communications network comprises a heterogeneous network; and

the first and second cells are of different power class types.

25. The apparatus of claim 23, further comprising means for receiving, from the first base station, an allocation of an increased number of RBs to compensate for the decoding using only a subset of the set of RBs allocated for the PDSCH.

26. The apparatus of claim 23, further comprising means for determining, based on an existence or absence of guard RBs used when transmitting the PDSCH, whether to use all or a subset of the set of RBs allocated for the PDSCH for decoding the PDSCH.

27. An apparatus for wireless communication in a wireless communications network in which at least a first base station of a first cell and a second base station of a second cell share resource blocks (RBs) via a frequency division multiplexing (FDM) scheme, the apparatus comprising:

at least one processor configured to identify a set of RBs for transmitting a physical downlink shared channel (PDSCH), wherein the second base station is scheduled to limit transmissions using the identified set of RBs, identify one or more guard RBs surrounding the identified set of RB, and transmit the PDSCH using the identified RBs with limited or no transmissions by either the first or second base stations in the guard RBs; and

a memory coupled with the at least one processor;

wherein;

the identified set of RBs are a distributed resource allocation; and

the guard RBs comprise one or more RBs on each side of one or more different portions of the identified set of RBs.

28. An apparatus for wireless communication in a system in which at least a first base station of a first cell and a second base station of a second cell share resource blocks (RBs) via a frequency division multiplexing (FDM) scheme, the apparatus comprising:

at least one processor configured to receive, from the first base station, a set of RBs allocated for a physical downlink shared channel (PDSCH), wherein the second base station is scheduled to limit transmissions using the identified set of RBs and decode the PDSCH using only a subset of the set of RBs allocated for the PDSCH, wherein the subset does not include one or more RBs at either edge of the set of RBs allocated for the PDSCH; and

a memory coupled with the at least one processor;

wherein decode the PDSCH using only a subset of the set of RBs allocated for the PDSCH comprises puncture logarithmic likelihood ratios (LLRs) for the one or more RBs at either edge of the set of RBs allocated for the PDSCH.

29. A computer program product comprising a non-transitory computer readable medium having instructions stored thereon for wireless communication in a wireless communications network in which at least a first base station of a first cell and a second base station of a second cell share resource blocks (RBs) via a frequency division multiplexing (FDM) scheme, the instructions executable by one or more processors for:

identifying a set of RBs for transmitting a physical downlink shared channel (PDSCH), wherein the second base station is scheduled to limit transmissions using the identified set of RBs;

identifying one or more guard RBs surrounding the identified set of RBs; and

transmitting the PDSCH using the identified RBs with limited or no transmissions by either the first or second base stations in the guard RBs;

wherein;

the identified set of RBs are a distributed resource allocation; and

the guard RBs comprise one or more RBs on each side of one or more different portions of the identified set of RBs.

30. A computer program product comprising a non-transitory computer readable medium having instructions stored thereon for wireless communication in a wireless communications network in which at least a first base station of a first cell and a second base station of a second cell share resource blocks (RBs) via a frequency division multiplexing (FDM) scheme, the instructions executable by one or more processors for:

receiving, from the first base station, a set of RBs allocated for a physical downlink shared channel (PDSCH), wherein the second base station is scheduled to limit transmissions using the identified set of RBs; and

decoding the PDSCH using only a subset of the set of RBs allocated for the PDSCH, wherein the subset does not include one or more RBs at either edge of the set of RBs allocated for the PDSCH;

wherein decoding the PDSCH using only a subset of the set of RBs allocated for the PDSCH comprises puncturing logarithmic likelihood ratios (LLRs) for the one or more RBs at either edge of the set of RBs allocated for the PDSCH.