System information block providing cell access information supporting wideband coverage enhancement in wireless communication networks

• US 10,405,228 B2
• Filed: 02/08/2018
• Issued: 09/03/2019
• Est. Priority Date: 06/08/2017
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Liu, Chih-Hao, Yerramalli, Srinivas, Radulescu, Andrei Dragos, Kadous, Tamer
• Primary Examiner(s): Liu, Jung
• Application Number:
  US15/892,183
• Publication Number:
  US 20180359656A1
• Time in Patent Office: 572 Days
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 28/0289 Congestion control load shedding arrangements in network planning H04W16/08; performing reselection for handling the traffic H04W36/22; wireless traffic scheduling H04W72/12
• CPC Class Codes: H04W 48/12 using downlink control channel
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

Configurations of system information blocks providing cell access information supporting wideband coverage enhancement in wireless communication networks are disclosed. Embodiments encode and transmit information elements for both a legacy system information block and a wideband coverage enhancement system information block in a multiple subframe discovery reference signal configuration. For example, embodiments may utilize a two subframe CR-DRS configuration in which a WCE SIB-MF1 message payload is encoded and transmitted independently with respect to a legacy SIB-MF1 message payload. Additionally, or alternatively, embodiment may utilize a two subframe CR-DRS configuration in which both a legacy SIB-MF1 message payload and a WCE SIB-MF1 message payload share the same DRS subframe payload by jointly encoding the legacy SIB-MF1 and WCE SIB-MF1 messages.

Claims

1. A method for wideband coverage enhancement (WCE) in a wireless network, the method comprising;

determining, by controller logic of a base station operable in the wireless network, if a legacy system information block (SIB) message payload size is larger than a WCE SIB message payload size by a threshold amount, wherein the legacy SIB message payload comprises system information to aid one or more UE operable in the wireless network implementing a non-wideband coverage enhancement communication mode and the WCE SIB message payload comprises system information to aid one or more UE operable in the wireless network implementing a wideband coverage enhancement communication mode;

if the legacy SIB message payload size is larger than the WCE SIB message payload by the threshold amount, transmitting, using a transmit processor of the base station, a multiple subframe coverage enhancement (CE) discovery reference signal (DRS) having the legacy SIB message payload and the WCE SIB message payload independently encoded therein; and

if the legacy SIB message payload size is not larger than the WCE SIB message payload by the threshold amount, transmitting, using a transmit processor of the base station, the multiple subframe CE DRS having the legacy SIB message payload and the WCE SIB message payload jointly encoded therein.

2. The method of claim 1, wherein the threshold amount comprises the legacy SIB message payload size being at least twice the WCE SIB message payload size.

3. The method of claim 1, wherein the multiple subframe CE DRS comprises a legacy DRS and a WCE-DRS, wherein if the legacy SIB message payload size is larger than the WCE SIB message payload by the threshold amount the legacy SIB message payload is communicated in the legacy DRS and the WCE SIB message payload is communicated in the WCE-DRS, and wherein if the legacy SIB message payload size is not larger than the WCE SIB message payload by the threshold amount the legacy SIB message payload and the WCE SIB message payload are each communicated in both the legacy DRS and the WCE-DRS.

4. The method of claim 3, wherein the WCE-DRS comprises more resources of the multiple subframe CE DRS than the legacy DRS.

5. The method of claim 3, further comprising:

if the legacy SIB message payload size is larger than the WCE SIB message payload by the threshold amount, indicating that the legacy SIB message payload and the WCE SIB message payload are independently encoded in the multiple subframe CE DRS by placing an extended physical downlink control channel (ePDCCH) in the WCE-DRS.

6. The method of claim 3, further comprising:

if the legacy SIB message payload size is not larger than the WCE SIB message payload by the threshold amount, indicating that the legacy SIB message payload and the WCE SIB message payload are jointly encoded in the multiple subframe CE DRS by placing an extended physical downlink control channel (ePDCCH) in the legacy DRS.

7. The method of claim 3, wherein the WCE-DRS comprises a cell specific reference signal (CRS), the method further comprising:

using scrambling of subframe number 1 for a first set of resource blocks (RBs) in the WCE-DRS if a first DRS falls in any of subframe numbers 0 through 4; and

using scrambling of subframe number 6 for the first set of RBs in the WCE-DRS if the first DRS falls in any of subframe numbers 5 through 9.

8. The method of claim 7, further comprising:

using scrambling of subframe number 1 for RBs in the WCE-DRS other than the first set RBs if a first DRS falls in any of subframe numbers 0 through 4; and

using scrambling of subframe number 6 for RBs in the WCE-DRS other than the first set of RBs if the first DRS falls in any of subframe numbers 5 through 9.

9. The method of claim 7, further comprising:

using a legacy scrambling rule for RBs in the WCE-DRS other than the first set RBs.

10. The method of claim 9, wherein the legacy scrambling rule comprises:

when the legacy DRS and the WCE-DRS of the multiple subframe CE DRS fall in subframes n and n+1 respectively, using scrambling of subframe number n for RBs of the legacy DRS and scrambling of subframe number n+1 for RBs of the WCE-DRS.

11. An apparatus configured for wideband coverage enhancement (WCE), the apparatus comprising:

at least one processor; and

a memory coupled to the processor, wherein the at least one processor is configured;

to determine, by a base station operable in the wireless network, if a legacy system information block (SIB) message payload size is larger than a WCE SIB message payload size by a threshold amount, wherein the legacy SIB message payload comprises system information to aid one or more UE operable in the wireless network implementing a non-wideband coverage enhancement communication mode and the WCE SIB message payload comprises system information to aid one or more UE operable in the wireless network implementing a wideband coverage enhancement communication mode;

to transmit, by the base station, a multiple subframe coverage enhancement (CE) discovery reference signal (DRS) having the legacy SIB message payload and the WCE SIB message payload independently encoded therein if the legacy SIB message payload size is larger than the WCE SIB message payload by the threshold amount; and

to transmit, by the base station, the multiple subframe CE DRS having the legacy SIB message payload and the WCE SIB message payload jointly encoded therein if the legacy SIB message payload size is not larger than the WCE SIB message payload by the threshold amount.

12. The apparatus of claim 11, wherein the threshold amount comprises the legacy SIB message payload size being at least twice the WCE SIB message payload size.

13. The apparatus of claim 11, wherein the multiple subframe CE DRS comprises a legacy DRS and a WCE-DRS, wherein if the legacy SIB message payload size is larger than the WCE SIB message payload by the threshold amount the legacy SIB message payload is communicated in the legacy DRS and the WCE SIB message payload is communicated in the WCE-DRS, and wherein if the legacy SIB message payload size is not larger than the WCE SIB message payload by the threshold amount the legacy SIB message payload and the WCE SIB message payload are each communicated in both the legacy DRS and the WCE-DRS.

14. The apparatus of claim 13, wherein the WCE-DRS comprises more resources of the multiple subframe CE DRS than the legacy DRS.

15. The apparatus of claim 13, wherein the at least one processor is further configured:

to indicate that the legacy SIB message payload and the WCE SIB message payload are independently encoded in the multiple subframe CE DRS by placing an extended physical downlink control channel (ePDCCH) in the WCE-DRS if the legacy SIB message payload size is larger than the WCE SIB message payload by the threshold amount.

16. The apparatus of claim 13, wherein the at least one processor is further configured:

to indicate that the legacy SIB message payload and the WCE SIB message payload are jointly encoded in the multiple subframe CE DRS by placing an extended physical downlink control channel (ePDCCH) in the legacy DRS if the legacy SIB message payload size is not larger than the WCE SIB message payload by the threshold amount.

17. The apparatus of claim 13, wherein the WCE-DRS comprises a cell-specific reference signal (CRS), wherein the at least one processor is further configured:

to use scrambling of subframe number 1 for a first set of resource blocks (RBs) in the WCE-DRS if a first DRS falls in any of subframe numbers 0 through 4; and

to use scrambling of subframe number 6 for the first set of RBs in the WCE-DRS if the first DRS falls in any of subframe numbers 5 through 9.

18. The apparatus of claim 17, wherein the at least one processor is further configured:

to use scrambling of subframe number 1 for RBs in the WCE-DRS other than the first set RBs if a first DRS falls in any of subframe numbers 0 through 4; and

to use scrambling of subframe number 6 for RBs in the WCE-DRS other than the first set of RBs if the first DRS falls in any of subframe numbers 5 through 9.

19. The apparatus of claim 17, wherein the at least one processor is further configured:

to use a legacy scrambling rule for RBs in the WCE-DRS other than the first set RBs.

20. The apparatus of claim 19, wherein the at least one processor configured to use the legacy scrambling rule is configured to:

to use scrambling of subframe number n for RBs of the legacy DRS and scrambling of subframe number n+1 for RBs of the WCE-DRS when the legacy DRS and the WCE-DRS of the multiple subframe CE DRS fall in subframes n and n+1 respectively.

21. A method for wideband coverage enhancement (WCE) in a wireless network, the method comprising:

receiving, by a UE configured for WCE wireless communications in the wireless network, a multiple subframe coverage enhancement (CE) discovery reference signal (DRS) having both legacy system information block (SIB) message payload and WCE SIB message payload encoded therein, wherein the legacy SIB message payload comprises system information to aid one or more UE operable in the wireless network implementing a non-wideband coverage enhancement communication mode and the WCE SIB message payload comprises system information to aid one or more UE operable in the wireless network implementing a wideband coverage enhancement communication mode;

determining, by controller logic of the UE, if a location of one or more resources within the multiple subframe CE DRS indicates that the legacy SIB message payload and the WCE SIB message payload are independently encoded in the multiple subframe CE DRS or that the legacy SIB message payload and the WCE SIB message payload are jointly encoded in the multiple subframe CE DRS;

if it is determined that the location of the one or more resources within the multiple subframe CE DRS indicates that the legacy SIB message payload and the WCE SIB message payload are independently encoded in the multiple subframe CE DRS, decoding, using a receive processor of the UE, the WCE SIB message payload for use by the UE in implementing the wideband coverage enhancement communication mode; and

if it is determined that the location of the one or more resources within the multiple subframe CE DRS indicates that the legacy SIB message payload and the WCE SIB message payload are jointly encoded in the multiple subframe CE DRS, decoding, using a receive processor of the UE, the legacy SIB message payload and the WCE SIB message payload for use by the UE in implementing the wideband coverage enhancement communication mode.

22. The method of claim 21, wherein the one or more resources comprise an extended physical downlink control channel (ePDCCH).

23. The method of claim 21, wherein the multiple subframe CE DRS comprises a legacy DRS and a WCE-DRS, wherein if the location of the one or more resources within the multiple subframe CE DRS indicates that the legacy SIB message payload and the WCE SIB message payload are independently encoded the legacy SIB message payload is communicated in the legacy DRS and the WCE SIB message payload is communicated in the WCE-DRS, and wherein if the location of the one or more resources within the multiple subframe CE DRS indicates that the legacy SIB message payload and the WCE SIB message payload are jointly encoded the legacy SIB message payload and the WCE SIB message payload are each communicated in both the legacy DRS and the WCE-DRS.

24. The method of claim 23, wherein it is determined that legacy SIB message payload and the WCE SIB message payload are independently encoded if the location of the one or more resources within the multiple subframe CE DRS is in the WCE-DRS.

25. The method of claim 23, wherein it is determined that legacy SIB message payload and the WCE SIB message payload are jointly encoded if the location of the one or more resources within the multiple subframe CE DRS is in the legacy DRS.

26. An apparatus configured for wideband coverage enhancement (WCE) in a wireless network, the apparatus comprising:

at least one processor; and

a memory coupled to the processor, wherein the at least one processor is configured;

to receive, by a UE configured for WCE wireless communications in the wireless network, a multiple subframe coverage enhancement (CE) discovery reference signal (DRS) having both legacy system information block (SIB) message payload and WCE SIB message payload encoded therein, wherein the legacy SIB message payload comprises system information to aid one or more UE operable in the wireless network implementing a non-wideband coverage enhancement communication mode and the WCE SIB message payload comprises system information to aid one or more UE operable in the wireless network implementing a wideband coverage enhancement communication mode;

to determine, by the UE, if a location of one or more resources within the multiple subframe CE DRS indicates that the legacy SIB message payload and the WCE SIB message payload are independently encoded in the multiple subframe CE DRS or that the legacy SIB message payload and the WCE SIB message payload are jointly encoded in the multiple subframe CE DRS;

to decode, by the UE, the WCE SIB message payload for use by the UE in implementing the wideband coverage enhancement communication mode if it is determined that the location of the one or more resources within the multiple subframe CE DRS indicates that the legacy SIB message payload and the WCE SIB message payload are independently encoded in the multiple subframe CE DRS; and

to decode, by the UE, the legacy SIB message payload and the WCE SIB message payload for use by the UE in implementing the wideband coverage enhancement communication mode if it is determined that the location of the one or more resources within the multiple subframe CE DRS indicates that the legacy SIB message payload and the WCE SIB message payload are jointly encoded in the multiple subframe CE DRS.

27. The apparatus of claim 26, wherein the one or more resources comprise an extended physical downlink control channel (ePDCCH).

28. The apparatus of claim 26, wherein the multiple subframe CE DRS comprises a legacy DRS and a WCE-DRS, wherein if the location of the one or more resources within the multiple subframe CE DRS indicates that the legacy SIB message payload and the WCE SIB message payload are independently encoded the legacy SIB message payload is communicated in the legacy DRS and the WCE SIB message payload is communicated in the WCE-DRS, and wherein if the location of the one or more resources within the multiple subframe CE DRS indicates that the legacy SIB message payload and the WCE SIB message payload are jointly encoded the legacy SIB message payload and the WCE SIB message payload are each communicated in both the legacy DRS and the WCE-DRS.

29. The apparatus of claim 28, wherein it is determined that legacy SIB message payload and the WCE SIB message payload are independently encoded if the location of the one or more resources within the multiple subframe CE DRS is in the WCE-DRS.

30. The apparatus of claim 28, wherein it is determined that legacy SIB message payload and the WCE SIB message payload are jointly encoded if the location of the one or more resources within the multiple subframe CE DRS is in the legacy DRS.