Chapter 13 – Specific AT Commands
Multi-Tech Systems, Inc. CDMA Wireless AT Commands (PN S000294J)
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Cell Environment and RxLev Indication +CCED
Description:
This command can be used by the application to retrieve information about the main cell and up to six
neighboring cells. This is an extended command that may be used in two different settings
:
1. Interrogation of the cell environment information
2. Interrogation of the
received signal strength indication
(RSSI)
The +CCED command supports two modes of operation: on request by the application or automatically by
the product every 5 seconds.
Values:
<mode>
0
Requests a single snapshot of cell data
1
Start automatic snapshot mode
2
Stop automatic snapshot mode
Automatic snapshot mode will not return a terminating “OK”. The unsolicited resCCED and/or
+CSQ will be used to return the requested information.
<requested dump>
1
Main Cell: <mode>, <band class>, <Channel #>, SID, NID, <Base Station P Rev>, [<Pilot PN offset>],
<Base Station ID>, [<Slot cycle index>], [<Ec/Io>], <Rx power>, <Tx power>, <Tx Adj>
2
Neighbor1 to Neighbor20 (max): The first value is the <number of neighbor entries> in the response.
Each neighbor entry consists of the following values: <band class>, [<Pilot PN>], <Frequency
Assignment>
4
Timing Advance: Always zero for CDMA
8
Main cell RSSI indication (RxLev) from 0 to 31.
If the <requested dump> parameter is not specified, the <requested dump> value from the previous
+CCED command will be used. If no prCCED <requested dump> value is available, a default
value of 13 (8, 4, and 1) will be used.
For <requested dump> 4, 2, and 1, the requested information is output using the unsolCCED
response. Place holders are used in the +CCED output for fields that cannot be measured or are not
meaningful in the current mode of operation. In this case, consecutive commas will be present in the
output. There are also several optional parameters ([]) that are not displayed in analog mode and will
result in place holders in the +CCED command output. Automatic snapshots of these dumps is not
supported during communication or registration.
For <requested dump> 1, the first value output in the unsolCCED response is the +CCED
command specified <mode> (0, 1, or 2). The value displayed for Ec/Io is the index of the Active set in
0.5dB steps from 0 (0dB) to 63 (-31.5dB). For example: 0 = 0dB, 1 = 0.5dB, 2 = 1dB, … 62 = 31dB,
63 = 31.5dB. The value displayed for <Rx power>, <Tx power>, and <Tx Adj> is in terms of dBm.
For <requested dump> 8, the information is output using the unsolCSQ response. The 07.07
format of the +CSQ response is respected. However, the <fer> portion of the +CSQ response is not
evaluated by this dump request so the <fer> value will always be 99. Automatic snapshots are
supported in idle mode and during communication.
The combination of multiple <requested dump> values (addition of the values) in a CCED
command is supported with the exception of <requested dump> 2. The <requested dump> 2 value
must be use by itself and not in combination with other dump request values.
Either or both the +CCED and +CSQ responses are used for output depending upon the <requested
dump> value. Activation or deactivation of a +CCED response flow will not affect an exCSQ
response flow. Likewise, activation or deactivation of a +CSQ response flow will not affect an existing
+CCED response flow.