Pattern indicator signal for new DMRS pattern

• US 9,258,104 B2
• Filed: 12/20/2013
• Issued: 02/09/2016
• Est. Priority Date: 04/04/2013
• Status: Expired due to Fees

• Current Assignee: Intel Corporation
• Original Assignee: Intel IP Corporation (Intel Corporation)
• Inventors: Bashar, Shafi, Han, Seunghee, Fwu, Jong-Kae, Davydov, Alexei Vladimirovich, Fong, Mo-Han
• Primary Examiner(s): Nguyen, Simon
• Application Number:
  US14/137,500
• Publication Number:
  US 20140302887A1
• Time in Patent Office: 781 Days
• Field of Search: 455/69, 455450-4522, 455/509, 455/522, 455/550.1, 370328-330
• US Class Current: 1/1
• CPC Class Codes: H04B 1/38 Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
• 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 7/0639 Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
• CPC Class Codes: H04L 1/1854 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 12/18 for broadcast or conference , e.g. multicast
• CPC Class Codes: H04L 43/0823 Errors, e.g. transmission errors
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0055 Physical resource allocation for ACK/NACK for physical mapping arrangements in ARQ protocols H04L1/1861
• CPC Class Codes: H04L 5/0094 Indication of how sub-channels of the path are allocated
• CPC Class Codes: H04L 5/14 Two-way operation using the same type of signal, i.e. duplex
• CPC Class Codes: H04L 65/1016 IP multimedia subsystem [IMS]
• CPC Class Codes: H04L 65/1045 Proxies, e.g. for session initiation protocol [SIP]
• CPC Class Codes: H04L 65/1104 Session initiation protocol [SIP]
• CPC Class Codes: H04L 65/611 for multicast or broadcast systems for broadcast or conference H04L12/18; arrangements for broadcast or distribution combined with broadcast H04H20/00; arrangements for broadcast applications with a direct linkage to broadcast information or to broadcast space-time H04H60/00; selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS], H04W4/06
• CPC Class Codes: H04L 65/613 for the control of the source by the destination control signals issued by the client directed to the server or network components specially adapted for selective content distribution H04N21/637
• CPC Class Codes: H04L 67/02 based on web technology, e.g. hypertext transfer protocol [HTTP]
• CPC Class Codes: H04L 67/1076 Resource dissemination mechanisms or network resource keeping policies for optimal resource availability in the overlay network
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 24/08 : Testing, supervising or monitoring using real traffic
• CPC Class Codes: H04W 36/0088 : Scheduling hand-off measurements
• CPC Class Codes: H04W 36/0094 : Definition of hand-off measurement parameters
• CPC Class Codes: H04W 36/14 : Reselecting a network or an air interface
• CPC Class Codes: H04W 36/302 : due to low signal strength
• CPC Class Codes: H04W 36/38 : by fixed network equipment
• CPC Class Codes: H04W 4/70 : Services for machine-to-machine communication [M2M] or machine type communication [MTC]
• CPC Class Codes: H04W 56/001 : Synchronization between nodes
• CPC Class Codes: H04W 68/02 : Arrangements for increasing efficiency of notification or paging channel
• CPC Class Codes: H04W 72/0446 : Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/1215 : for collaboration of different radio technologies
• CPC Class Codes: H04W 72/1263 : Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
• CPC Class Codes: H04W 72/21 : in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 72/23 : in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 72/51 : based on terminal or device properties
• CPC Class Codes: H04W 72/52 : based on load
• CPC Class Codes: H04W 74/0808 : using carrier sensing, e.g. carrier sense multiple access [CSMA]
• CPC Class Codes: H04W 76/00 : Connection management
• CPC Class Codes: H04W 76/10 : Connection setup
• CPC Class Codes: H04W 76/11 : Allocation or use of connection identifiers
• CPC Class Codes: H04W 76/12 : Setup of transport tunnels
• CPC Class Codes: H04W 76/15 : Setup of multiple wireless link connections
• CPC Class Codes: H04W 76/20 : Manipulation of established connections
• CPC Class Codes: H04W 76/22 : Manipulation of transport tunnels
• CPC Class Codes: H04W 76/27 : Transitions between radio resource control [RRC] states
• CPC Class Codes: H04W 76/28 : Discontinuous transmission [DTX]; Discontinuous reception [DRX]
• CPC Class Codes: H04W 76/30 : Connection release
• CPC Class Codes: H04W 76/38 : triggered by timers
• CPC Class Codes: H04W 8/005 : Discovery of network devices, e.g. terminals
• CPC Class Codes: H04W 84/045 : using private Base Stations, e.g. femto Base Stations, home Node B
• CPC Class Codes: H04W 84/12 : WLAN [Wireless Local Area Networks]
• CPC Class Codes: H04W 88/02 : Terminal devices
• CPC Class Codes: H04W 88/06 : adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
• CPC Class Codes: H04W 88/08 : Access point devices
• CPC Class Codes: H04W 92/20 : between access points
• CPC Class Codes: Y02D 30/70 : in wireless communication networks

Abstract

A small cell station communicates with user equipment utilizing a reduced overhead demodulation reference signal (DMRS) pattern when good channel conditions are detected. An indicator field is used to identify whether a reduced overhead DMRS pattern is being transmitted. If appropriate, the reduced overhead DMRS pattern is generated and transmitted by the small cell station and received and used by the user equipment as indicated by the indicator field.

Claims

1. A system comprising:

a transceiver having a power range corresponding to a small cell station;

a processor; and

a memory having instructions for execution by the processor to;

determine whether a reduced overhead demodulation reference signal (DMRS) pattern is appropriate for communications with multiple mobile devices communicatively coupled to the system operating as a small cell station;

generate an indicator field to identify whether a reduced overhead DMRS pattern is being transmitted, wherein the indicator field comprises two bits to indicate (1) whether the DMRS pattern corresponds to a new carrier type (NCT) DMRS pattern, (2) a legacy DMRS pattern, and (3) whether the DMRS pattern is a reduced overhead DMRS pattern;

generate the DMRS pattern consistent with the indicator field; and

cause the indicator field and the DMRS pattern to be transmitted by the transceiver.

2. The system of claim 1 wherein the reduced DMRS pattern is reduced in frequency by using a lesser number of subcarriers that include a resource element of the DMRS pattern.

3. The system of claim 2, wherein the DMRS pattern includes a resource element in only one or two sub-carriers and only one or two symbols of a slot.

4. The system of claim 3, wherein the sub-carriers include sub-carriers one, six, or eleven.

5. The system of claim 3, wherein the sub-carriers include only sub-carrier six.

6. The system of claim 3, wherein the sub-carriers include only sub-carriers one and eleven.

7. The system of claim 3, wherein the symbols include only symbols five and six.

8. The system of claim 3, wherein the DMRS pattern is repeated in consecutive slots.

9. The system of claim 3, wherein the DMRS pattern is different in consecutive slots.

10. The system of claim 9, wherein the DMRS pattern includes first resource elements in symbols five and six of only sub-carriers one and eleven of a first slot of the consecutive slots and includes second resource elements in symbols five and six of only sub-carrier six of a second slot of the consecutive slots.

11. The system of claim 1 wherein the reduced DMRS pattern is reduced in time by using a lesser number of symbols that include a resource element of the DMRS pattern.

12. The system of claim 1 wherein the reduced DMRS pattern is reduced in frequency and in time by using a lesser number of subcarriers that include a resource element of the DMRS pattern and using a lesser number of symbols that include a resource element of the DMRS pattern.

13. The system of claim 1 wherein the indicator field identifies the reduced DMRS pattern when channel conditions are not deteriorated.

14. The system of claim 1 wherein the small cell station is communicating directly with mobile devices.

15. The system of claim 1, wherein the DMRS pattern includes twelve resource elements in each of two consecutive slots.

16. The system of claim 15, wherein the DMRS pattern includes resource elements in symbols one and two or two and three of sub-carriers zero, one, five, six, ten and eleven of a first slot of the consecutive slots and resource elements in symbols twelve and thirteen of sub-carriers zero, one, five, six, ten and eleven of a second slot of the consecutive slots.

17. A method comprising:

determining via a small cell station whether a reduced overhead demodulation reference signal (DMRS) pattern is appropriate for communications with multiple mobile devices communicatively coupled to the system operating as a small cell station;

generating via the small cell station an indicator field to identify whether a reduced overhead DMRS pattern is being transmitted, wherein the indicator field comprises two bits to indicate (1) whether the DMRS pattern corresponds to a new carrier type (NCT) DMRS pattern, (2) a legacy DMRS pattern, and (3) whether the DMRS pattern is a reduced overhead DMRS pattern;

generating via the small station the DMRS pattern consistent with the indicator field; and

transmitting the indicator field and the reduced overhead DMRS pattern.

18. The method of claim 17 wherein the reduced DMRS pattern is reduced in frequency and in time.

19. The method of claim 17 wherein the small cell station is transmitting directly to mobile devices.