LTE Backhaul

6Design Examples

Jari Salo¹ and Esa Markus Metsälä²

¹ Nokia Networks, Doha, Qatar

² Nokia Networks, Espoo, Finland

6.1 Introduction

In this chapter, two design examples are given for the purpose of putting together design concepts discussed in Chapter 5. In the first example (Scenario 1) the operator has his own transport network, and microwave transport is deployed for the first few miles. The second example (Scenario 2) is similar to the first one, except that now the access transport between the cell site and the operator regional data center is based on leased line.

Table 6.1 presents the high-level design targets and boundary conditions assumed for both design examples of this chapter.

Table 6.1 Input information for both scenarios

Type	High-level design inputs for access transport
IP plan	3000 base station sites From IP planning viewpoint allow at least up to 9000 eNBs, or three eNB per site (future scalability requirement) IPv4 used in access transport
Quality of service	Average X2 user and control plane delay <5 ms VoLTE packet delay variation due to transport network <5 ms (one-way peak) Maximum 10% throughput degradation for best effort TCP data caused by transport network when using M/G/R-PS dimensioning
Availability	Average eNB availability >99.99%. Availability requirement applies to the access and the pre-aggregation tiers of the transport network Average eNB unavailability is evaluated as the sum of unavailable minutes over all eNBs ...