Timing synchronization in discovery signals

• US 9,398,062 B2
• Filed: 12/27/2013
• Issued: 07/19/2016
• Est. Priority Date: 03/29/2013
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: Intel IP Corporation (Intel Corporation)
• Inventors: Xiong, Gang, Han, Seunghee, Chatterjee, Debdeep
• Primary Examiner(s): Zhao, Wei
• Application Number:
  US14/142,572
• Publication Number:
  US 20140293988A1
• Time in Patent Office: 935 Days
• Field of Search: 370/344
• US Class Current: 1/1
• CPC Class Codes: H04B 1/56 with provision for simultaneous communication in two directions
• CPC Class Codes: H04B 7/0417 Feedback systems
• CPC Class Codes: H04B 7/0452 Multi-user MIMO systems
• CPC Class Codes: H04B 7/0617 for beam forming
• CPC Class Codes: H04B 7/0619 using feedback from receiving side feedback signaling for adaptive modulation/coding H04L1/0001
• CPC Class Codes: H04B 7/063 Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection
• CPC Class Codes: H04B 7/0695 using beam selection
• CPC Class Codes: H04B 7/088 using beam selection
• CPC Class Codes: H04L 1/1864 ARQ related signaling H04L1/1607 takes precedence
• CPC Class Codes: H04L 2025/03426 transmission using multiple-input and multiple-output channels
• CPC Class Codes: H04L 25/0204 of multiple channels
• CPC Class Codes: H04L 25/03305 Joint sequence estimation and interference removal joint detection of several desired signals H04L25/03331
• CPC Class Codes: H04L 47/803 Application aware
• CPC Class Codes: H04L 47/83 based on usage prediction
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• 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 5/0053 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 5/0057 Physical resource allocation for CQI
• CPC Class Codes: H04L 5/0085 : when channel conditions change
• CPC Class Codes: H04L 5/1469 : using time-sharing
• 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 65/65 : Network streaming protocols, e.g. real-time transport protocol [RTP] or real-time control protocol [RTCP]
• CPC Class Codes: H04L 65/70 : Media network packetisation
• CPC Class Codes: H04L 65/75 : Media network packet handling
• CPC Class Codes: H04L 65/752 : adapting media to network capabilities
• CPC Class Codes: H04L 65/756 : adapting media to device capabilities
• CPC Class Codes: H04L 65/762 : at the source reformatting of additional data in video distribution servers H04N21/2355
• CPC Class Codes: H04L 65/764 : at the destination reformatting of additional data in video clients H04N21/4355
• CPC Class Codes: H04L 65/80 : Responding to QoS
• CPC Class Codes: H04M 1/72457 : according to geographic location
• CPC Class Codes: H04N 21/2402 : Monitoring of the downstream path of the transmission network, e.g. bandwidth available traffic monitoring in data switching networks H04L43/00; monitoring data switching networks utilization H04L43/0876
• CPC Class Codes: H04N 21/8456 : by decomposing the content in the time domain, e.g. in time segments
• CPC Class Codes: H04N 21/8543 : using a description language, e.g. Multimedia and Hypermedia information coding Expert Group [MHEG], eXtensible Markup Language [XML] information retrieval of semistructured data, the underlying structure being taken into account, e.g. mark-up language structure data G06F16/80
• CPC Class Codes: H04W 24/00 : Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 24/02 : Arrangements for optimising operational condition
• CPC Class Codes: H04W 28/02 : Traffic management, e.g. flow control or congestion control
• CPC Class Codes: H04W 28/0226 : based on location or mobility handoff or reselection H04W36/00; mobile application services making use of the location of users or terminals H04W4/02
• 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 28/082 : among bearers or channels
• CPC Class Codes: H04W 28/20 : Negotiating bandwidth
• CPC Class Codes: H04W 36/0011 : for data sessions of end-to-end connection
• CPC Class Codes: H04W 36/0022 : for transferring data sessions between adjacent core network technologies
• CPC Class Codes: H04W 36/0072 : of resource information of target access point
• CPC Class Codes: H04W 36/08 : Reselecting an access point
• CPC Class Codes: H04W 36/125 : involving different types of service backbones
• CPC Class Codes: H04W 36/22 : for handling the traffic
• CPC Class Codes: H04W 36/26 : by agreed or negotiated communication parameters
• CPC Class Codes: H04W 4/021 : Services related to particular areas, e.g. point of interest [POI] services, venue services or geofences
• CPC Class Codes: H04W 48/06 : based on traffic conditions
• 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 48/18 : Selecting a network or a communication service
• CPC Class Codes: H04W 56/001 : Synchronization between nodes
• CPC Class Codes: H04W 72/0446 : Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/046 : the resource being in the space domain, e.g. beams
• CPC Class Codes: H04W 72/541 : using the level of interference
• CPC Class Codes: H04W 76/15 : Setup of multiple wireless link connections
• CPC Class Codes: H04W 8/02 : Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
• CPC Class Codes: H04W 8/06 : Registration at serving network Location Register, VLR or user mobility server
• CPC Class Codes: H04W 8/082 : for traffic bypassing of mobility servers, e.g. location registers, home PLMNs or home agents
• CPC Class Codes: H04W 84/042 : Public Land Mobile systems, e.g. cellular systems
• 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 88/08 : Access point devices
• CPC Class Codes: H04W 88/10 : adapted for operation in multiple networks, e.g. multi-mode access points
• CPC Class Codes: Y02D 30/70 : in wireless communication networks

Abstract

Embodiments described herein relate generally to a device that is to transmit signals using a control channel. The device may be, for example, a user equipment or low-powered radio access node. Before transmitting the signal, the transmitting device may modify symbols associated with the signal. For example, the transmitting device may generate a scrambling sequence and modulate the symbols associated with the signal with the scrambling sequence. In another example, the transmitting device may apply a shifting pattern or hopping pattern to the sequence indices associated with sequences for symbols to be included in the signal. The applied pattern may change one or more sequence indices associated with one or more symbol indices associated with the signal. Other embodiments may be described and claimed.

Claims

1. An apparatus to be included in a device, the apparatus comprising:

processing circuitry;

to generate a discovery signal that includes a first symbol of a plurality of symbols associated with a first control channel sequence for discovery of the device by another device for a wireless device-to-device communication; and

to modify a sequence index associated with the first control channel sequence by application of a predetermined function to the sequence index, the predetermined function to change an association of the sequence index from a first symbol index to a second symbol index; and

communication circuitry, communicatively coupled with the processing circuitry, the communication circuitry to transmit the discovery signal associated with the modified sequence index to improve timing acquisition between the device and the other device.

2. The apparatus of claim 1, wherein the processing circuitry is to:

shift the sequence index associated with the first control channel sequence by application of the predetermined function, the shift of the sequence index to change a first symbol index associated with the sequence index to an adjacent symbol index.

3. The apparatus of claim 2, wherein the apparatus is to apply a cyclic shift a to the first control channel sequence r_u,v(n), the cyclically shifted first control channel sequence r_u,v^(α

)(n) defined by e<sup>jα

n</sup>r_u,v,l(n), 0≦

n≦

M_sc^RS, where M_sc^RS is a length of the first control channel sequence, l is the symbol index, and the shift of the sequence index associated with the first control channel sequence is defined by r_u,v,l(n)=r_u+l,v(n).

4. The apparatus of claim 1, wherein the processing circuitry is to:

modify a sequence index associated with the first control channel sequence by application of the predetermined function, the modification of the sequence index to change a first symbol index associated with the sequence index to a pseudorandom symbol index based on a pseudorandom hopping pattern.

5. The apparatus of claim 4, wherein the apparatus is to apply a cyclic shift a to the first control channel sequence r_u,v(n), the cyclically shifted first control channel sequence r_u,v^(α

) (n) defined by e<sup>jα

n</sup>r_u,v,l(n), 0≦

n≦

M_sc^RS, where M_sc^RS where is a length of the first control channel sequence, l is the symbol index, the modification of the sequence index associated with the first control channel sequence is defined by r_u,v,l(n)=r_u+f(l),v(n) and f(l) is given by the pseudorandom hopping pattern.

6. The apparatus claim 1, wherein the first control channel sequence is a physical uplink control channel sequence and the communication circuitry is to transmit the discovery signal, to the other device, using a physical uplink control channel.

7. The apparatus of claim 1, wherein the first control channel sequence is a base sequence or an orthogonal sequence.

8. The apparatus of claim 1, wherein the device is unsynchronized with the other device.

9. The apparatus of claim 1, wherein the device in which the apparatus is to be included is a user equipment (“

UE”

) to operate on a wireless cell or a low-powered radio access node to provide a small cell.

10. A non-transitory computer-readable medium having stored thereon instructions to be performed in a device associated with a wireless network for discovery in the wireless network, the non-transitory computer-readable medium comprising instructions to:

generate a discovery signal that includes a first symbol of a plurality of symbols associated with a first control channel sequence for discovery of the device in a wireless network;

apply a predetermined function to a first sequence index associated with the first sequence, the predetermined function to change associations of sequence indices and symbol indices within the discovery signal; and

transmit the discovery signal to improve timing acquisition associated with the device.

11. The non-transitory computer-readable medium of claim 10, wherein the instructions to apply the predetermined function to the first sequence comprises instructions to:

shift a plurality of sequence indices to change the first sequence index associated with a first symbol index an adjacent symbol index.

12. The non-transitory computer-readable medium of claim 10, wherein the instructions to apply the predetermined function to the first sequence index comprises instructions to:

hop, based on a pseudorandom hopping pattern, a plurality of sequence indices to change a respective sequence index associated with a first symbol index to a new symbol index.