Transmission of physical broadcast channel (PBCH) contents

• US 9,386,476 B2
• Filed: 06/26/2014
• Issued: 07/05/2016
• Est. Priority Date: 09/17/2013
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: Intel IP Corporation (Intel Corporation)
• Inventors: Han, Seunghee, Xiong, Gang, Khoryaev, Alexey
• Primary Examiner(s): Phan, Tri H
• Application Number:
  US14/316,180
• Publication Number:
  US 20150078348A1
• Time in Patent Office: 740 Days
• Field of Search: 370203-211, 370/252, 370310-350, 370400-401, 370/431, 370/436, 370441-442, 370478-485, 370/498
• US Class Current: 1/1
• CPC Class Codes: G01S 5/0236 Assistance data, e.g. base station almanac
• CPC Class Codes: H04B 7/2643 using time-division multiple access [TDMA] H04B7/2615, H04B7/2618 take precedence
• CPC Class Codes: H04J 13/0048 Walsh
• CPC Class Codes: H04J 3/02 Details electronic switching or gating H03K17/00
• CPC Class Codes: H04L 1/1893 Physical mapping arrangements physical resource mapping in general H04L5/00
• CPC Class Codes: H04L 27/2601 Multicarrier modulation systems
• CPC Class Codes: H04L 5/003 Arrangements for allocating sub-channels of the transmission path
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0051 of dedicated pilots, i.e. pilots destined for a single user or terminal
• CPC Class Codes: H04L 5/14 Two-way operation using the same type of signal, i.e. duplex
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 28/0236 radio quality, e.g. interference, losses or delay
• CPC Class Codes: H04W 28/0242 Determining whether packet losses are due to overload or to deterioration of radio communication conditions
• CPC Class Codes: H04W 28/0247 based on conditions of the access network or the infrastructure network central resource management H04W28/16
• CPC Class Codes: H04W 28/0268 using specific QoS parameters for wireless networks, e.g. QoS class identifier [QCI] or guaranteed bit rate [GBR] negotiating SLA or negotiating QoS H04W28/24
• CPC Class Codes: H04W 28/12 using signalling between network elements
• CPC Class Codes: H04W 36/04 Reselecting a cell layer in multi-layered cells
• CPC Class Codes: H04W 4/14 Short messaging services, e.g. short message services [SMS] or unstructured supplementary service data [USSD]
• CPC Class Codes: H04W 4/70 Services for machine-to-machine communication [M2M] or machine type communication [MTC]
• CPC Class Codes: H04W 64/00 Locating users or terminals or network equipment for network management purposes, e.g. mobility management
• CPC Class Codes: H04W 72/0446 : Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/0466 : the resource being a scrambling code
• CPC Class Codes: H04W 72/23 : in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 76/28 : Discontinuous transmission [DTX]; Discontinuous reception [DRX]

Abstract

Technology for transmitting physical broadcast channel (PBCH) contents is disclosed. An evolved node B (eNB) may configure one or more repetitions of PBCH content for transmission, to a user equipment (UE), from a cell at a selected time interval. The eNB may select a scrambling code for the one or more repetitions of PBCH content transmitted from the cell. The eNB may apply the scrambling code to one or more repetitions of PBCH content.

Claims

1. An evolved node B (eNB) operable to transmit physical broadcast channel (PBCH) contents, the eNB having computer circuitry configured to:

configure one or more repetitions of PBCH content for transmission, to a user equipment (UE), from a cell at a selected time interval;

select a scrambling code for the one or more repetitions of PBCH content transmitted from the cell; and

apply the scrambling code to one or more repetitions of PBCH content.

2. The computer circuitry of claim 1, further configured to select the scrambling code based on a function of at least one of:

a physical cell ID, a slot number, a subframe number, a system frame number (SFN), or an index related to the one or more repetitions of PBCH content.

3. The computer circuitry of claim 1, wherein the PBCH content includes modified physical broadcast channel (mPBCH) content.

4. The computer circuitry of claim 1, wherein the scrambling code is selected to provide interference randomization for PBCH collision patterns at the UE.

5. The computer circuitry of claim 1, further configured to select a separate scrambling code for each of the repetitions of PBCH content.

6. The computer circuitry of claim 1, wherein each repetition of PBCH content is transmitted to the UE in a slot of a subframe.

7. The computer circuitry of claim 1, further configured to apply the scrambling codes on the one or more repetitions of PBCH content on top of an existing scrambling code.

8. The computer circuitry of claim 1, further configured to scramble bits included in the one or more repetitions of PBCH content according to {tilde over (b)}_m(i)=({tilde over (b)}(i)+c^m(i))mod 2, wherein c^m(i) is a scrambling sequence and is initialized with c_init^m=f(N_ID^cell) in each subframe n_sf transmitting the one or more repetitions of PBCH content to the UE.

9. The computer circuitry of claim 1, further configured to scramble bits included in the one or more repetitions of PBCH content transmitted in subframe n_sf according to {tilde over (b)}(i)=(b(i)+c(i))mod 2, wherein c(i) is a scrambling sequence and is initialized with c_init=2⁹·

n_sf+N_ID^cell in each radio frame fulfilling n_f mod 4=0.

10. The computer circuitry of claim 1, further configured to scramble bits included in the one or more repetitions of PBCH content according to {tilde over (b)}_m(i)=(b(i)+c^m(i))mod 2, wherein c^m(i) is a scrambling sequence and is initialized with c_init^m=f(N_ID^cell) in each radio frame fulfilling n_f mod 4=0.

11. The computer circuitry of claim 1, further configured to apply the scrambling code on information bits, encoded bits or modulation symbols included in the one or more repetitions of PBCH content.

12. The computer circuitry of claim 1, wherein the UE is operable to perform machine type communication (MTC).

13. The computer circuitry of claim 1, further configured to apply an interleaving pattern to the one or more repetitions of PBCH content in order to achieve interference randomization.

14. The computer circuitry of claim 13, further configured to apply the interleaving pattern with at least one of:

encoded bits, information bits or modulation symbols.

15. The computer circuitry of claim 13, further configured to select the interleaving pattern using a pseudo random sequence that is initialized based on a physical cell ID or a subframe number.

16. A method for transmitting physical broadcast channel (PBCH) contents, the method comprising:

configuring one or more repetitions of PBCH content, at an evolved node B (eNB), for transmission to a user equipment (UE) from a cell at a selected timing interval;

selecting an orthogonal code cover for the one or more repetitions of PBCH content at the eNB, wherein the orthogonal code cover is selected to substantially cancel PBCH interference at the UE; and

applying the orthogonal code cover to the one or more repetitions of PBCH content.

17. The method of claim 16, further comprising selecting the orthogonal code cover using a physical cell identifier (ID).

18. The method of claim 16, wherein the orthogonal code cover includes a Discrete Fourier Transform (DFT) code or a Walsh code.

19. The method of claim 16, wherein the DFT codes are selected according to

20. The method of claim 16, wherein the UE includes an antenna, a touch sensitive display screen, a speaker, a microphone, a graphics processor, an application processor, internal memory, or a non-volatile memory port.

21. At least one non-transitory machine readable storage medium comprising a plurality of instructions adapted to be executed to implement the method of claim 16.

22. An evolved node B (eNB) operable to transmit physical broadcast channel (PBCH) contents, the eNB having computer circuitry configured to:

configure one or more repetitions of PBCH content for transmission, to a user equipment (UE), from a cell at a selected timing interval;

select an offset value for the one or more repetitions of PBCH content, wherein the offset value is selected to substantially avoid PBCH collisions at the UE; and

apply the offset value to the one or more repetitions of PBCH content.

23. The computer circuitry of claim 22, further configured to select the offset value using a physical cell identifier (ID).

24. The computer circuitry of claim 22, wherein the UE that receives the PBCH content from the cell is configured for machine type communication (MTC).

25. The computer circuitry of claim 22, wherein the PBCH content includes modified physical broadcast channel (mPBCH) content.