Synchronization Sequences and Random Access in Higher Frequencies Sample Clauses

Synchronization Sequences and Random Access in Higher Frequencies. As described before, beamforming will further increase the challenges of initial access in general. Using multiple antenna elements to beamform, i.e., concentrate the signal energy in a specific direction, is the standard way to combat high pathloss in the mmWave frequencies and hence extend coverage. However, even with BF, due to low penetration of the signal in these high frequencies the mmWave link will face acute and potentially frequent shadowing. Also, mobility in any axis (x,y,z) will cause the change of the spatial signatures of two ends of the link , leading to frequent SINR drops. These two factors make up one of the basic characteristics of the mmWave channel: intermittency. In LTE-A omnidirectional transmission is considered for synchronization signal(s) and system information i.e. there is no directionality and the channel is more robust. However, considering that new AIVs should be possibly deployed in higher frequencies the following issues are expected:  We expect to have more quick drops of SINR due to channel intermittency;  Beams are expected to cover smaller areas and beam to beam handovers will be more frequent. Thus efficient synchronization and system access procedures are needed for handling the more frequent handovers and cell (re-)selections. LTE’s four-step initial access, comprises synchronization (Sync), random access (RA), connection request, and, contention resolution with the first two being the most challenging in a directional initial access procedure since:  After Sync the UE must know the mmWBS position in the angular domain in order to establish the directional link to the mmWBS if beamforming is implemented on the UE side  After RA, the mmWBS in turn must position the UE in the angular plane. The major difference of the designs presented and evaluated to the current LTE initial access procedures, as shown in Figure 4-5, are:  The two initial steps, Sync and RA, are done directionally,  Sync and RA preambles are spread across four different frequency regions to gain frequency diversity. We assume a discretized 3D angular domain of maximum size NBS- by-NUE over which the mmW-BS and UE need to scan to detect the best angle pair. NBS and NUE are the number of antenna elements on the mmW-BS and the UE, respectively. If NBS = 64 and NUE = 16, the size of the angular space is 1024 angles. Figure 4-5 Directional initial access procedure Figure 4-6 shows exemplary detection delays in milliseconds for a fixed overhead of 5...
Sample 1
AutoNDA by SimpleDocs

Related to Synchronization Sequences and Random Access in Higher Frequencies

  • Access Toll Connecting Trunk Group Architecture 9.2.1 If CBB chooses to subtend a Verizon access Tandem, CBB’s NPA/NXX must be assigned by CBB to subtend the same Verizon access Tandem that a Verizon NPA/NXX serving the same Rate Center Area subtends as identified in the LERG.

  • Start-Up and Synchronization Consistent with the mutually acceptable procedures of the Developer and Connecting Transmission Owner, the Developer is responsible for the proper synchronization of the Large Generating Facility to the New York State Transmission System in accordance with NYISO and Connecting Transmission Owner procedures and requirements.

  • Traffic Measurement and Billing over Interconnection Trunks 6.1 For billing purposes, each Party shall pass Calling Party Number (CPN) information on at least ninety-five percent (95%) of calls carried over the Interconnection Trunks.

  • Scope of Interconnection Service 1.3.1 The NYISO will provide Energy Resource Interconnection Service to Interconnection Customer at the Point of Interconnection.

  • Synchronization The Licensor hereby grants limited synchronization rights for One (1) music video streamed online (Youtube, Vimeo, etc..) for up to 500,000 non-monetized video streams on all total sites. A separate synchronisation license will need to be purchased for distribution of video to Television, Film or Video game.

  • Points of Interconnection and Trunk Types 2.1 Point(s) of Interconnection.

  • OGS Centralized Contract Modifications OGS, an Authorized User, or the Contractor may suggest modifications to the Centralized Contract or its Appendices. Except as specifically provided herein, modifications to the terms and conditions set forth herein may only be made with mutual written agreement of the Parties. Modifications may take the form of an update or an amendment. “

  • Use of Interconnection Facilities by Third Parties 46 9.9.1 Purpose of Interconnection Facilities 46 9.9.2 Third Party Users. 46

  • System Access Control Data processing systems used to provide the Cloud Service must be prevented from being used without authorization. Measures: • Multiple authorization levels are used when granting access to sensitive systems, including those storing and processing Personal Data. Authorizations are managed via defined processes according to the SAP Security Policy • All personnel access SAP’s systems with a unique identifier (user ID). • SAP has procedures in place so that requested authorization changes are implemented only in accordance with the SAP Security Policy (for example, no rights are granted without authorization). In case personnel leaves the company, their access rights are revoked. • SAP has established a password policy that prohibits the sharing of passwords, governs responses to password disclosure, and requires passwords to be changed on a regular basis and default passwords to be altered. Personalized user IDs are assigned for authentication. All passwords must fulfill defined minimum requirements and are stored in encrypted form. In the case of domain passwords, the system forces a password change every six months in compliance with the requirements for complex passwords. Each computer has a password-protected screensaver. • The company network is protected from the public network by firewalls. • SAP uses up–to-date antivirus software at access points to the company network (for e-mail accounts), as well as on all file servers and all workstations. • Security patch management is implemented to provide regular and periodic deployment of relevant security updates. Full remote access to SAP’s corporate network and critical infrastructure is protected by strong authentication.

  • XXX Hosting 10.1 XXX Hosting is not required for resale in the BellSouth region.

Time is Money Join Law Insider Premium to draft better contracts faster.