Control channel based broadcast messaging

Patent metadata

Field	Value
Publication number	US-2016309282-A1
Application number	US-201615132729-A
Country	US
Kind code	A1
Filing date	Apr 19, 2016
Priority date	Apr 20, 2015
Publication date	Oct 20, 2016
Grant date	—

Abstract

Aspects of the present disclosure provided techniques that may be applied in systems to allow for communication over a control channel utilizing a relatively narrowband (e.g., six physical resource blocks) based search space. An exemplary method, performed, for example, by a machine type communication (MTC) UE, generally includes identifying, within a subframe, a first search space to monitor for a control channel that occupies a first number of physical resource blocks (PRBs) that represents a narrowband within a system bandwidth comprising a plurality of narrowbands and monitoring at least the first search space for the control channel, wherein the control channel comprises broadcast control information.

First claim

What is claimed is:

1 . A method for wireless communications by a user equipment (UE), comprising:
identifying, within a subframe, a first search space to monitor for a control channel that occupies a first number of physical resource blocks (PRBs) that represents a narrowband within a system bandwidth comprising a plurality of narrowbands; and monitoring at least the first search space for the control channel, wherein the control channel comprises broadcast control information.

2 . The method of claim 1 , wherein the broadcast control information comprises a paging message.

3 . The method of claim 2 , wherein the paging message comprises paging information for multiple UEs and a UE ID for addressing the paging message to the UE, and wherein the paging message is scrambled with a paging radio network temporary identifier (P-RNTI).

4 . The method of claim 2 , further comprising receiving configuration information for the paging message in a system information block (SIB).

5 . The method of claim 4 , wherein the narrowband is different from other narrowbands of the plurality of narrowbands used to carry paging messages for other UEs.

6 . The method of claim 5 , further comprising identifying the narrowband to receive the paging message according to a UE-ID-to-narrowband mapping rule.

7 . The method of claim 1 , further comprising receiving an indication of a system information block (SIB) modification, wherein the SIB comprises information for decoding the broadcast control information.

8 . The method of claim 7 , wherein receiving the indication of the SIB modification comprises receiving the indication of the SIB modification in a master information block (MIB) transmitted on a physical broadcast channel (PBCH).

9 . The method of claim 8 , further comprising receiving signaling indicating how often the UE should acquire the MIB.

10 . The method of claim 7 , wherein receiving the indication of the SIB modification comprises receiving the indication of the SIB modification in the control channel.

11 . The method of claim 10 , wherein different combinations of two bits in the control channel indicate whether there is a SIB modification and whether there is paging information for the UE.

12 . The method of claim 7 , wherein the indication of the SIB modification comprises and indication of what fields in the SIB are modified and values of the fields in the SIB that are modified.

13 . The method of claim 1 , wherein the broadcast control information comprises a random access response (RAR) message.

14 . The method of claim 13 , wherein for contention based access the RAR message comprises at least one of a timing advance (TA), a grant for uplink (UL) transmissions, a temporary radio network temporary identifier (T-RNTI), or a preamble identifier.

15 . The method of claim 14 , wherein the RAR message further comprises a bundle size for the UL transmissions.

16 . The method of claim 13 , wherein for non-contention based access the RAR message comprises at least one of a cell radio network temporary identifier (C-RNTI), a timing advance (TA), or random access channel (RACH) configuration.

17 . The method of claim 13 , further comprising receiving configuration information for the RAR message in a system information block (SIB).

18 . The method of claim 1 , wherein the control channel comprises a downlink control channel.

19 . The method of claim 18 , wherein the downlink control channel comprises at least one of a machine type communication physical downlink control channel (MPDCCH) or a narrow band physical downlink control channel (NB-PDCCH).

20 . A method for wireless communications by a base station (BS), comprising:
identifying, within a subframe, a first search space for transmitting a control channel that occupies a first number of physical resource blocks (PRBs) that represents a narrowband within a system bandwidth comprising a plurality of narrowbands; and transmitting the control channel, to a user equipment (UE), using a decoding candidate in the first search space, wherein the control channel comprises broadcast control information.

21 . The method of claim 20 , wherein the broadcast control information comprises a paging message.

22 . The method of claim 21 , wherein the paging message comprises paging information for multiple UEs and a UE ID for addressing the paging message to the UE, and wherein the paging message is scrambled with a paging radio network temporary identifier (P-RNTI).

23 . The method of claim 21 , further comprising transmitting configuration information for the paging message in a system information block (SIB).

24 . The method of claim 23 , wherein the narrowband is different from other narrowbands of the plurality of narrowbands used to carry paging messages for other UEs.

25 . The method of claim 24 , further comprising identifying the narrowband to transmit the paging message to the UE according to a UE-ID-to-narrowband mapping rule.

26 . The method of claim 20 , further comprising transmitting an indication of a system information block (SIB) modification, wherein the SIB comprises information for decoding the broadcast control information.

27 . The method of claim 26 , wherein transmitting the indication of the SIB modification comprises transmitting the indication of the SIB modification in a master information block (MIB) on a physical broadcast channel (PBCH).

28 . The method of claim 27 , further comprising transmitting signaling indicating how often the UE should acquire the MIB.

29 . The method of claim 26 , wherein transmitting the indication of the SIB modification comprises transmitting the indication of the SIB modification in the control channel.

30 . The method of claim 29 , wherein different combinations of two bits in the control channel indicate whether there is a SIB modification and whether there is paging information for the UE.

31 . The method of claim 26 , wherein the indication of the SIB modification comprises and indication of what fields in the SIB are modified and values of the fields in SIB that are modified.

32 . The method of claim 20 , wherein the broadcast control information comprises a random access response (RAR) message.

33 . The method of claim 32 , wherein for contention based access the RAR message comprises at least one of a timing advance (TA), a grant for uplink (UL) transmissions, a temporary radio network temporary identifier (T-RNTI), or a preamble identifier.

34 . The method of claim 33 , wherein the RAR message further comprises a bundle size for the UL transmissions.

35 . The method of claim 32 , wherein for non-contention based access the RAR message comprises at least one of a cell radio network temporary identifier (C-RNTI), a timing advance (TA), or random access channel (RACH) configuration.

36 . The method of claim 32 , further comprising transmitting configuration information for the RAR message in a system information block (SIB).

37 . The method of claim 20 , wherein the control channel comprises a downlink control channel.

38 . The method of claim 37 , wherein the downlink control channel comprises at

Assignees

• Qualcomm Inc

Inventors

• Xu Hao
• Chen Wanshi
• Vajapeyam Madhavan Srinivasan
• Gaal Peter

Classifications

• H04W4/06 Primary

  Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services · CPC title

• H04W4/70 Primary

  Services for machine-to-machine communication [M2M] or machine type communication [MTC] · CPC title

• H04W24/08 Primary

  Testing, {supervising or monitoring} using real traffic · CPC title

• H04W74/006

  in the downlink, i.e. towards the terminal · CPC title

• H04W48/08

  Access restriction or access information delivery, e.g. discovery data delivery (signalling during connection H04W76/00) · CPC title