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3.1.1 Definitions
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3.1.2 Symbols
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3.1.2.1 Variables
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3.1.2.2 Constants
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3.1.2.3 Functions
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3.1.3 Abbreviations
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3.2 General
............................................................................................................................................................... 8
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3.3 Functional description
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3.3.1 Filter bank and computation of sub-band levels
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3.3.2 Pitch detection
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3.3.3 Tone detection
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3.3.4 Correlated Complex Signal Analysis (and detection)
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3.3.5 VAD decision
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3.3.5.1 Hangover addition
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3.3.5.2 Background noise estimation
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4 Technical Description of VAD Option 2
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4.1 Definitions, symbols and abbreviations
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4.1.1 Definitions
.................................................................................................................................................. 18
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4.1.2 Symbols
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4.1.2.1 Variables
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4.1.2.2 Constants
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4.1.2.3 Functions
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4.1.3 Abbreviations
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4.2 General
............................................................................................................................................................. 21
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4.3 Functional description
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4.3.1 Frequency Domain Conversion
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4.3.2 Channel Energy Estimator
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4.3.3 Channel SNR Estimator
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4.3.4 Voice Metric Calculation
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4.3.5 Frame SNR and Long-Term Peak SNR Calculation
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4.3.6 Negative SNR Sensitivity Bias
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4.3.7 VAD Decision
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4.3.8 Spectral Deviation Estimator
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4.3.9 Sinewave Detection
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4.3.10 Background Noise Update Decision
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4.3.10 Background Noise Estimate Update
........................................................................................................... 27
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5 Computational details
............................................................................................................................27 Annex A (informative) : Change history...............................................................................................28 History.....................................................
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0.1 References
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0.2 Abbreviations
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1 Call Waiting (CW)
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1.1 Waiting call indication and confirmation
........................................................................................................... 7
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1.2 Normal operation with successful outcome
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1.2.1 Waiting call accepted; existing call released
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1.2.2 Waiting call accepted; existing call on hold
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1.2.3 Existing call released by user A; waiting call accepted
................................................................................ 9
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1.3 Normal operation with unsuccessful outcome
................................................................................................... 9
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1.3.1 Waiting call released by subscriber B
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1.3.2 Waiting call released by calling user C
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1.3.3 Waiting call times out
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1.3.4 No reply condition timer expires
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1.4 Activation
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1.5 Deactivation
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1.6 Interrogation
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1.7 Invocation
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1.8 Registration and erasure
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2 Call Hold (HOLD)
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2.1 Normal operation
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2.1.1 Hold and retrieve functions
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2.1.2 Hold invocation
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2.1.3 Retrieve procedure
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2.1.4 Alternate from one call to the other
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2.1.5 Auxiliary states for hold and retrieve
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2.1.6 An example of dimensioned state space
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2.2 Activation and deactivation
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2.3 Registration, erasure and interrogation
............................................................................................................ 16 Annex A: Change history......................................................................................................................17 History............................................................
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0 Scope
The present document specifies the procedures used at the radio interface (Reference point Um as defined in GSM 04.02) for normal operation, registration, erasure, activation, deactivation, invocation and interrogation of call completion supplementary services. Provision and withdrawal of supplementary services is an a...
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0.1 References
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0.2 Abbreviations
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0.3 Cross phase compatibility
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1 Call Forwarding Unconditional (CFU)
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1.1 Normal operation
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1.1.1 Served mobile subscriber side
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1.1.2 Forwarded-to mobile subscriber side
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1.1.3 Calling mobile subscriber side
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1.2 Registration
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1.2.1 Registration by the served mobile subscriber
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1.3 Erasure
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1.3.1 Erasure by the served mobile subscriber
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1.4 Activation
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1.5 Deactivation
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1.6 Interrogation
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1.7 Cross phase compatibility
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1.7.1 Network only supports protocol version 1 control of SS by the subscriber
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1.7.2 MS only supports protocol version 1 control of SS by the subscriber
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2 Call Forwarding on mobile subscriber Busy (CFB)
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2.1 Normal operation
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2.1.1 Served mobile subscriber side
.................................................................................................................... 14 2.1.2 Forwarded-to mobile subscriber side ......................................................................................................... 15
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2.1.3 Calling mobile subscriber side
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2.2 Registration
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2.2.1 Registration by the served mobile subscriber
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2.3 Erasure
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2.3.1 Erasure by the served mobile subscriber
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2.4 Activation
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2.5 Deactivation
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2.6 Interrogation
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2.7 Cross phase compatibility
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2.7.1 Network only supports protocol version 1 control of SS by the subscriber
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2.7.2 MS only supports protocol version 1 control of SS by the subscriber
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3 Call Forwarding on No Reply (CFNRy)
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3.1 Normal operation
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