Page 1
RPC/RP Manual RPC Installation
23
2-
Figure 2-20: Card Installation
14. Connect the RMT or PC to the connector on the ECNT module. See Figure
2-21.
19June2000 WLL-RPC/RP-IN/UM-1.0
Page 2
2-
24
RPC Installation RPC/RP Manual
Figure 2-21: Maintenance Terminal or PC Connection
F NOTE: RPC maintenance and configuration can also be made throught the
network management system via the COT which is connected to the RPC.
15. Load operation data.
16. Replace the power source cover on the front of the RPC and secure it with
screws as shown in Figure 2-22.
WLL-RPC/RP-IN/UM-1.0 19June2000
Page 3
RPC/RP Manual RPC Installation
25
2-
Figure 2-22: Replacement of Power Source Cover
17. Replace the card cover. Make certain the hinge pins are properly aligned with
the hinge. Tighten the thumbscrews.
19June2000 WLL-RPC/RP-IN/UM-1.0
Page 4
2-
26
RPC Installation RPC/RP Manual
Figure 2-23: Replacement of the Card Cover
18. This concludes the RPC installation.
19. When the RPs have been installed and connected to the RP Interface cards,
measure the loop resistance of the cable. Then set the Distance Switch on the
RP Interface card based on the loop resistance value. Refer to the table and
figure below. The factory setting is Short.
Setting Loop Resistance
Long 150Ω or more
Short Less than 150Ω
Table 2-3: Distance Switch Settings
WLL-RPC/RP-IN/UM-1.0 19June2000
Page 5
RPC/RP Manual RPC Installation
27
2-
Figure 2-24: Distance Switch
19June2000 WLL-RPC/RP-IN/UM-1.0
Page 6
WLL-RPC/RP-IN/UM-1.0 19June2000
2-
28
RPC Installation RPC/RP Manual
Page 7
RP Installation
3 RP Installation
3.1 General Description
The Radio Port (RP) is the radio equipment base station that relays the
communication from the user side to the operator/network side or vice versa. A
standard installation for RP applications places several RPs in a common service
area. However, the number of RPs and their distribution deployment depend on
the following factors:
3
• Topography of the service area
• Subscriber distribution in the service area
• Desired Grade of Service and traffic load.
There are two types of RPs:
• Outdoor - is small in size and is encased in a weather-proof cabinet. This
gives it the potential for various mounting scenarios - installed on the
dedicated poles, buildings, or street lamp poles.
• Indoor - is also small in size and can be installed in public and semi-public
locations like an office building, a shopping mall, or an underground
parking lot.
The power for the RP is fed from the RPC and a synchronous clock is delivered
from the RPC. The radio link between the RP and the FSU, or the RP and the PS
is based on RCR-STD 28 Ver.2 PHS technology, which defines frequency bands,
protocol, and so on. Both the indoor and the outdoor RPs have a 2 branch built-in
antenna.
The architecture of the WLL system is illustrated in Figure 3-1, which is followed
by a block diagram of the RP.
19June2000 WLL-RPC/RP-IN/UM-1.0
Page 8
3-
2
RP Installation RPC/RP Manual
Figure 3-1: RP in the WLL System
WLL-RPC/RP-IN/UM-1.0 19June2000
Page 9
RPC/RP Manual RP Installation
3
Figure 3-2: Radio Port Block Diagram
3-
3.1.1 Traffic Handling
PHS applies Time Division Multiplex Access (TDMA) and Time Division
Duplex (TDD) techniques. Each individual radio link between the RP and the
FSU/PS is assigned 1 time slot for a control channel (C-ch) and 3 slots for traffic
channels (T-chs).
In the case of a single RP, there are 4 time slots installed for radio links. One slot
is the control channel for signaling and the other three are the traffic channels.
The number of accommodated subscribers in that RP covering the zone calculated
according to the erlang theory is as follows:
• Erlang per zone (3 T-chs, GOS=5%) = 0.899 erlang
• Subscribers (FSUs or PSs) (0.899÷.08) = 11 subscribers
Group Control maximizes the number of channels available for traffic by
allowing one control channel to control up to 8 RPs (up to 31 traffic channels),
which is an efficient application for high traffic areas. One master RP can control
a maximum of 7 RPs in the same area. The master RP has one control channel,
and all the other channels are assigned for traffic, leaving 31 channels open for
traffic. Figure 3-3 represents the group control configuration with 4 RPs in the
group.
19June2000 WLL-RPC/RP-IN/UM-1.0
Page 10
3-
4
RP Installation RPC/RP Manual
Figure 3-3: Group Control RPs
In the group control mode, the number of accommodated subscribers in the group
control coverage zone is calculated in accordance with the erlang theory as
follows (with 4 RPs in the group):
• Erlang per zone (15 T-chs, GOS=5%) = 10.663 erlang
• Subscribers (FSUs or PSs) (10.663÷.08) = 132 subscribers
The comparison for the number of accommodated subscribers between the group
controlled RPs and the single RP is shown in Figure 3-4.
F NOTE: Figure 3-4 represents the group control with 4 RPs. Each group can
have a maximum of 8 RPs.
WLL-RPC/RP-IN/UM-1.0 19June2000
Page 11
RPC/RP Manual RP Installation
5
3-
Figure 3-4: Accommodated Subscribers per RP in Group and Non-group Control
The recommended installation design for RPs is as follows:
• A zone of sparse subscribers should be covered by non-group controlled
RPs.
• A zone of dense subscribes should be covered by group-controlled RPs.
The number of accommodated subscribers is the greatest when all of the RPs
connected to an RPC are configured in the group control mode. In this case (with
4 RPs in each group), the number of service zones is eight (32÷4), and the
maximum number of subscribers is 1,056 (132x8). Each Group Control zone
supplies 15 traffic channels. Eight zones require 120 channels (15x8) provided by
4 E1 lines with 30 channels each.
3.1.2 Cell Overlap
Maximum service results are achieved when the RP coverage area is strategically
installed in a Cell Overlap Capacity.
19June2000 WLL-RPC/RP-IN/UM-1.0
Page 12
3-
6
RP Installation RPC/RP Manual
Figure 3-5: Coverage Service Area with Cell Overlap
The combination of Cell Overlap and Dynamic Channel Allocation increases the
flexibility and the capacity of the system. Every user has access to all channels
(77x4) due to the overlapping base station topology. Cell Overlap enhances the
reliability and service quality. One malfunctioning base station does not affect
the performance of the system. Due to the Dynamic Channel Allocation, there is
no need for frequency planning, which allows the network to meet operators
current demands with the option to easily expand at a later date.
3.1.3 Air Interface Handling
The radio interface has four-channel time division multiple access capability with time
division duplexing (4-channel TDMA-TDD), which provides one control channel and
three traffic channels for each cell station.
WLL-RPC/RP-IN/UM-1.0 19June2000
Page 13
RPC/RP Manual RP Installation
7
3-
Figure 3-6: Radio Channel Structure
The radio frequency allocation shown in Figure 3-6 displays a typical radio
channel structure when three cordless handsets are operating through a single RP.
RCR STD-28 does not designate a control channel prior to the operation. Instead,
it assigns the control slot to any one of the four available slots.
Traffic channels are not preassigned. Channel assignment is performed by a
distributed-autonomous dynamic channel assignment scheme and is an essential
function of the WLL radio system. Channel assignment for new communication
is selected from the available channel resources mapped in a two-dimensional
frequency-time matrix renewed by the result of checking signal strength when the
call is established. The RP also completes handling of the signaling process over
the radio segment.
Due to the separation of the traffic and control channels, traffic channels can be
allocated in a distributed and autonomous manner by employing the switching
TDMA mechanism. In order to maximize the benefit of carrier switching TDMA,
the RP uses a system that synchronizes radio frames by superimposing
synchronization data on the B interface. The result of this synchronization is an
improved utilization of frequency as compared to asynchronous systems.
In addition, with TDMA-TDD and the diversity of the RP transmission and
reception, it is not necessary to install the multiple antenna or receiver-branch
diversity mechanisms in the PS handsets to improve the data communication
19June2000 WLL-RPC/RP-IN/UM-1.0
Page 14
3-
8
RP Installation RPC/RP Manual
quality. TDMA enables the antennas to share both transmitting and receiving
with the RF switches. To implement receiving diversity, the receiving units have
two receiving branches, while the transmitting unit has switches for switching
antennas to provide the transmission diversity.
3.2 System Construction
Figure 3-7 represents the RPC and RP configuration.
WLL-RPC/RP-IN/UM-1.0 19June2000
Page 15
RPC/RP Manual RP Installation
9
3-
Figure 3-7: RPC and RP Configuration
The dimensions of the indoor Radio Port are as follows:
• Height:142 mm
19June2000 WLL-RPC/RP-IN/UM-1.0
Page 16
3-
10
RP Installation RPC/RP Manual
• Width:154 mm
• Depth:47 mm
The dimensions of the outdoor Radio Port are as follows:
• Height:214±2.5 mm
• Width:260±2.5 mm
3.3 Indoor RP Installation Instructions
This section provides the instructions for installing an indoor RP. The flow chart
in Figure 3-8 describes the steps involved in the installation.
Figure 3-8: Indoor RP Installation Flow Chart
3.3.1 Before Beginning
To ensure that the RP installation goes smoothly, it is necessary to do adequate
planning prior to the installation. Things to consider:
• Correct placement of the RP
• Tools required
• Number of people needed to complete the installation
WLL-RPC/RP-IN/UM-1.0 19June2000
Page 17
RPC/RP Manual RP Installation
11
3.3.2 Site Selection
For indoor RP installation, select a site that satisfies the following requirements:
• Less than 3 meters from the RP antenna
• Not in direct sunlight or near a heat source such as a radiator
• Free from excessive humidity; not more that 95% non-condensing
• Free from excesses of heat or cold, not lower than -10°C nor higher than
+50°C
F NOTE: If more than 3 meters , consult a qualified field engineer.
3.3.3 Indoor RP Installation
Follow the steps below to install an indoor RP:
1. Carefully unpack the indoor RP and make sure it is in good condition.
3-
2. Attach the mounting plate to a wall with 2 screws as shown in Figure 3-9.
Figure 3-9: Indoor RP Mounting Plate
19June2000 WLL-RPC/RP-IN/UM-1.0
Page 18
3-
12
RP Installation RPC/RP Manual
3. Insert the RJ-11 end of the RPC cable into the connector on the back of the
indoor RP. Refer to Figure 3-10.
Figure 3-10: Connection to RPC
4. Attach the indoor RP to the mounting plate with the special screw as indicated
in Figure 3-11.
WLL-RPC/RP-IN/UM-1.0 19June2000
Page 19
RPC/RP Manual RP Installation
13
3-
Figure 3-11: Indoor RP and Mounting Plate
5. This concludes the installation of the indoor RP.
3.4 Outdoor RP Installation Instructions
This section provides the instructions for installing the outdoor RP. The flow
chart in Figure 3-12 defines that steps involved in the installation.
19June2000 WLL-RPC/RP-IN/UM-1.0
Loading...