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AT86RF231
8.5
8.5.1
Clear Channel Assessment (CCA)
The main features of the Clear Channel Assessment (CCA) module are:
? All 4 modes are available as defined by IEEE 802.15.4-2006 in section 6.9.9
? Adjustable threshold for energy detection algorithm
Overview
A CCA measurement is used to detect a clear channel. Four modes are specified by
IEEE 802.15.4 - 2006:
Table 8-8.
CCA Mode
1
2
0, 3
CCA Mode Overview
Description
Energy above threshold.
CCA shall report a busy medium upon detecting any energy above the ED threshold.
Carrier sense only.
CCA shall report a busy medium only upon the detection of a signal with the modulation
and spreading characteristics of an IEEE 802.15.4 compliant signal. The signal strength
may be above or below the ED threshold.
Carrier sense with energy above threshold.
CCA shall report a busy medium using a logical combination of
– Detection of a signal with the modulation and spreading
characteristics of this standard and
– Energy above the ED threshold.
Where the logical operator may be configured as either OR (mode 0) or AND (mode 3).
8.5.2
Configuration and Request
The CCA modes are configurable via register 0x08 (PHY_CC_CCA).
Using the Basic Operating Mode, a CCA request can be initiated manually by setting
CCA_REQUEST = 1 (register 0x08, PHY_CC_CCA), if the AT86RF231 is in any RX state. The
current channel status (CCA_STATUS) and the CCA completion status (CCA_DONE) are
accessible in register 0x01 (TRX_STATUS).
The CCA evaluation is done over eight symbol periods and the result is accessible
t TR28 = 140 μs (128 μs measurement duration and processing delay) after the request. The end
of a manually initiated CCA measurement is indicated by an interrupt IRQ_4 (CCA_ED_DONE).
The sub-register CCA_ED_THRES of register 0x09 (CCA_THRES) defines the received power
threshold of the " Energy above threshold " algorithm. The threshold is calculated by
RSSI_BASE_VAL + 2 * CCA_ED_THRES [dBm]. Any received power above this level is inter-
preted as a busy channel.
Note, it is not recommended to manually initiate a CCA measurement when using the Extended
Operating Mode.
94
8111C–MCU Wireless–09/09
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