Wireless communication system with common cell ID

• US 9,300,509 B2
• Filed: 12/13/2011
• Issued: 03/29/2016
• Est. Priority Date: 02/07/2011
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: Intel Corporation
• Inventors: Davydov, Alexei, Maltsev, Alexander, Zhu, Yuan, Etemad, Kamran, Zhang, Yujian, Morozov, Gregory V., Sergeyev, Vadim
• Primary Examiner(s): Banks Harold, Marsha D
• Assistant Examiner(s): PATEL, DHARMESH J
• Application Number:
  US13/995,175
• Publication Number:
  US 20130286997A1
• Time in Patent Office: 1,568 Days
• US Class Current: 1/1
• CPC Class Codes: H04B 7/024 Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
• CPC Class Codes: H04B 7/0456 Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
• CPC Class Codes: H04B 7/0619 using feedback from receiving side feedback signaling for adaptive modulation/coding H04L1/0001
• CPC Class Codes: H04L 1/06 using space diversity
• CPC Class Codes: H04L 27/26 Systems using multi-frequency codes H04L27/32 takes precedence
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 56/0045 compensating for timing error by altering transmission time
• CPC Class Codes: H04W 56/0085 detecting a given structure in the signal
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

Briefly, in accordance with one or more embodiments, a conventional physical downlink control channel (PDCCH) is transmitted in a first region of a physical downlink control channel structure utilized by a remote radio head that has been assigned a cell identifier that is common to one or more other remote radio heads within the cell, and an enhanced physical downlink control channel (ePDCCH) is transmitted in a second region of the physical downlink control channel structure.

Claims

1. An article of manufacture comprising a non-transitory storage medium having instructions stored thereon that, if executed, result in:

transmitting a physical downlink control channel (PDCCH) in a first region of a physical downlink control channel structure utilized by a remote radio head that has been assigned a cell identifier that is common to one or more other remote radio heads, or base station, or combinations thereof, within the cell;

wherein the PDCCH is modulated with a common scrambling code, and wherein the common scrambling code is common to multiple remote radio heads, or a base station, or combinations thereof, within the cell;

transmitting an enhanced physical downlink control channel (ePDCCH) in a second region of the physical downlink control channel structure;

wherein the ePDCCH is transmitted in a simultaneous transmission mode, and wherein one or more remote radio heads transmits its own control channel in the simultaneous transmission mode on resources common to the one or more remote radio heads using scrambling sequences specific to respective remote radio heads;

modulating demodulation reference signals with a specific scrambling sequence for said transmitting the enhanced physical downlink control channel;

spatially precoding the demodulation reference signals prior to said modulating; and

spatially precoding the enhanced physical downlink channel;

wherein spatial precoding of demodulation reference signals is substantially similar to the spatial precoding of the enhanced physical downlink channel.

2. An article of manufacture as claimed in claim 1, wherein the specific scrambling code is specific to one or more remote radio heads, or a base station, or combinations thereof.

3. An article of manufacture as claimed in claim 1, wherein the specific scrambling code is specific to one or more user equipment.

4. An article of manufacture comprising a non-transitory storage medium having instructions stored thereon that, if executed, result in:

transmitting a physical hybrid automatic repeat request indicator channel (PHICH) in a first region of a physical downlink control channel structure utilized by a remote radio head that has been assigned a cell identifier that is common to one or more other remote radio heads, or base station, or combinations thereof, within the cell;

transmitting an enhanced physical hybrid automatic repeat request indicator channel (ePHICH) in a second region of the physical downlink control channel structure, wherein an ePDCCH is transmitted in the second region in a simultaneous transmission mode, and wherein one or more remote radio heads transmits its own control channel in the simultaneous transmission mode on resources common to the one or more remote radio heads using scrambling sequences specific to a respective remote radio heads;

modulating the physical hybrid automatic repeat request indicator channel using a common scrambling code for said transmitting a physical hybrid automatic repeat request indicator channel; and

modulating enhanced physical hybrid automatic repeat request indicator channel signals with a specific scrambling sequence for said transmitting the enhanced physical downlink control channel.

5. An article of manufacture as claimed in claim 4, wherein the common scrambling code is common to multiple remote radio heads, or a base station, or combinations thereof, within the cell.

6. An article of manufacture as claimed in claim 4, wherein the specific scrambling sequence is specific to a particular remote radio head.

7. An article of manufacture as claimed in claim 4, wherein the specific scrambling sequence is specific to a particular user equipment.

8. An information handling system, comprising:

a baseband processor coupled to one or more wireless transceivers, wherein the baseband processor is configured to;

receive a physical downlink control channel (PDCCH) in a first region of a physical downlink control channel structure utilized by a remote radio head that has been assigned a cell identifier that is common to one or more other remote radio heads within the cell;

wherein the PDCCH is modulated with a common scrambling code, and wherein the common scrambling code is common to multiple remote radio heads, or a base station, or combinations thereof, within the cell; and

receive an enhanced physical downlink control channel (ePDCCH) in a second region of the physical downlink control channel structure;

wherein the ePDCCH is received in a simultaneous transmission mode, and wherein one or more remote radio heads transmits its own control channel in the simultaneous transmission mode on resources common to the one or more remote radio heads using scrambling sequences specific to a respective remote radio heads;

demodulate the physical downlink control channel with a common scrambling code used for transmitting the physical downlink control channel;

demodulate demodulation reference signals with a specific scrambling sequence used for transmitting the demodulation reference signals; and

spatially decode the demodulation reference signals.

9. An information handling system as claimed in claim 8, wherein the common scrambling code is common to multiple remote radio heads, or a base station, or combinations thereof, within the cell.

10. An information handling system as claimed in claim 8, wherein the specific scrambling code is specific to a one or more particular remote radio heads, or a base station, or combinations thereof.

11. An information handling system as claimed in claim 8, wherein the specific scrambling code is specific to one or more particular user equipment.

12. An information handling system as claimed in claim 8, further comprising an applications processor coupled to the baseband processor, and a touch screen to receive an input to control the applications processor.