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Test Data Service Option for IS-2000 An Overview
Page 2 Test Data Service Option for IS-2000
Overview
– Goal: to define a service option to test IS-2000 physical channels for RC>2 radio configurations.
– Major Requirements:» Service option connects at the Multiplex Sublayer» Support for generating both primary and secondary traffic
types on all valid combinations of Forward and Reverse link radio configurations
» Allow other service option(s) to operate concurrently on other unused physical channels
» Separate BER and/or FER statistics to be maintained for each physical channel under test
» Allow both MS and base station to control “test interval” parameters and retrieve counter values associated with error statistics collected on each physical channel
» A method to generate varying data bit patterns for the FCH/DCCH and SCH(s) to carry according to a selectable random or deterministic duty cycle
Page 3 Test Data Service Option for IS-2000
Overview (contd..)
– Major Requirements (contd..)
– Support for 40ms and 80ms frame lengths on the Supplemental Channels
– When a Supplemental channel rate change is signaled by the base station, the TDSO adjusts to the new rate and carries on the test
– The TDSO adjusts to the new physical channel scenario after a hard handoff is completed
Page 4 Test Data Service Option for IS-2000
Implementation
– Define a NEW Test Data Service Option (TDSO)» TDSO SO # [TBD] FWD RCx, REV RCy
- where x = 3, 4, 5, 6,7,8 or 9 and y = 3,4,5 or 6 while following stipulated RC rules
– Default TDSO Service Configuration:
Service Configuration Attribute Default Selections
– Some assumptions/restrictions:» Other service option(s) not permitted to share the same
physical channels as have been allocated to the TDSO at any given time - except for signaling
» Supplemental channels are allocated by the base station for an “infinite” duration, the MS shall release the TDSO call in case it receives a SCH de-allocation notice from the BS any time during the test interval
» No transmission at the physical layer due to running out of TX headroom is treated as a channel impairment. This may introduce some inaccuracies into the FER/BER calculations for the particular channel
– Change of test parameters signaled by the BS through Service Option Control Message directive collectively for all TDSO associated channels or selectively for each channel and direction (fwd/rev/both)
– Mobile station proposes a change of test parameters through the Service Option Control Message directive, however it is the base station that invokes the service through the SOCM
– The BS also uses the SOCM to indicate an error in the MS proposed values for the test parameters as well as lack of support for a specific test configuration or value e.g., circular buffer size
Page 8 Test Data Service Option for IS-2000
Implementation (contd..)
– Procedures: For most part same as Markov Service Option - very close to Markov SO fixed rate test mode
– For mobile originated TDSO calls, in absence of any special configuration at the BS, the TDSO initializes with FCH only carrying primary traffic using Mux Option 0x01
– Only full rate or blank frames supplied to the multiplex sublayer for each physical channel. Half rate frames are supplied by the TDSO on FCH/DCCH only when commanded by the multiplex sublayer
– Test interval subdivided into independent segments of 10.24 seconds (corresponding to 512, 256 or 128 frame periods at 20ms, 40ms and 80ms physical channel frame lengths)
– All pseudo-random number generators associated with the channel(s) are re-initialized prior to packet processing for each synchronization frame
– Pseudo-random processes are synchronized between the mobile station and the base station for each physical channel (separately for fwd. and rev. links)
– MS/BS can propose/control the TDSO test interval parameters through Control Directives distinguished by the CTL_REC_TYPE in the Service Option Control Message:
CTL_REC_TYPE Type of Directive
‘00000000’ Control Directive
Markov Service Option
‘00000001’ Counter Retrieval Directive
Markov Service Option
‘00000010’ Control Directive for all PhysicalChannels carrying TDSO traffic
‘00000011’ Control Directive for FCH
‘00000100’ Control Directive for DCCH
‘00000101’ Control Directive for SCH1
‘00000110’ Control Directive for SCH2
‘00000111’ Counter Retrieval Directive for FCH
‘00001000’ Counter Retrieval Directive for DCCH
‘00001001’ Counter Retrieval Directive for SCH1
‘00001010’ Counter Retrieval Directive for SCH2
All other CTL_REC_TYPE values are reserved.
Page 11 Test Data Service Option for IS-2000
Implementation (contd..)
– Control Directive from Base Station
– A control directive can affect operation of all physical channels configured under the TDSO or can target any specific physical channel
Field Length (bits)
CTL_REC_TYPE (‘00000010’- ‘00000110’) 8
CONTROL_CODE 8
CHANNEL_DIRECTION 2
COPY _COUNTERS 1
CLEAR_COUNTERS 1
DATA_SOURCE 1
FRAME_SOURCE 2
DUTY_CYCLE 1
NUM_CIRC_BUF_FRAMES 0 or 8
PERC_DUTY_CYCLE 0 or 8
TX_ON_PERIOD 0 or 8
TX_OFF_PERIOD 0 or 8
DATA_PATTERN 0 or 8
Page 12 Test Data Service Option for IS-2000
Implementation (contd..)
– Control Directive from Mobile Station
– Mobile station can only propose the values for the various TDSO parameters through the Service Option Control Message using the same message format as the base station
– The base station looks at the various fields and sends an invocation to the mobile station using the SOCM if the parameters requested by the MS are within allowed range and BS has the capability to support all of them
– Otherwise the base station sends an SOCM with an appropriate ERROR_CODE to the MS and the MS can propose an alternative set of parameters by sending the SOCM again
– Depending upon the test parameter in question, the BS may indicate its capabilities to the MS by replacing the particular field in the mobile proposed SOCM with the maximum value it can support, e.g., number of frames in the circular buffer
Page 13 Test Data Service Option for IS-2000
Implementation (contd..)
– Counter Retrieval Directive
– Used by the BS/MS to request actual transmit and receive frame/PDU counters maintained by the MS/BS for each physical channel
– Can be used in arriving at a more accurate calculation of the error statistics
– Example: MS Responses to Control Directives for Supplemental Channels
VECT_COUNTER_ID Vector Name
‘00000000’ FER Counters Response
‘00000001’ PER Counters Response
‘00000010’ Transmitted Counters Response
All other VECT_COUNTER_ID values are reserved.
Page 14 Test Data Service Option for IS-2000
Implementation (contd..)
– Data Block Format
– Each data block passed to the multiplex sublayer has its first 5 bits replaced by a header
– The CHANNEL_ID bits help attribute a received data block to a particular physical channel
– The PDU_SEQ_NUM bits are used to distinguish Mux PDUs within a received Supplemental channel frame
Field Length (bits)
CHANNEL_ID 2
PDU_SEQ_NUM 3
DATA Variable upto Mux PDU size
CHANNEL_ID Traffic Channel
‘00’ FCH
‘01’ DCCH
‘10’ SCH1
‘11’ SCH2
Page 15 Test Data Service Option for IS-2000
Implementation (contd..)
– Pseudo-random DATA_SOURCE» At the synchronization frame, for each physical channel,
pseudo random data is generated to fill a circular buffer with TWO full frame lengths of data bits as determined by the maximum channel transmission rate for the configured RC
– Selectable Byte Pattern DATA_SOURCE» default value 0xFF» All bytes in the data blocks passed to the multiplex
sublayer for a given frame period carry the same pattern
Page 16 Test Data Service Option for IS-2000
Implementation (contd..)
– Random DUTY_CYCLE» An average D% duty cycle is achieved by modeling the
ON and OFF events as a 2 state first order Markov chain
– Deterministic DUTY_CYCLE» Determined by the 8-bit TX_ON_PERIOD and
TX_OFF_PERIOD fields in the Service Option Control Message
ON OFF D
1-D
D1-D
Page 17 Test Data Service Option for IS-2000
Implementation (contd..)
– Handling of Supplemental Channel rate change:
– During a test call, whenever the MS receives a message signaling a change in the Supplemental channel configuration like change in transmission rate, the TDSO shall re-initialize with the default data pattern (0xFF) and duty cycle (100%) on that channel till the next synchronization frame
– The FER/PER counters shall be reset to zero
– At the first synchronization frame time after this, the TDSO shall use the same values for the test parameters as were being used before the transmission rate change
Page 18 Test Data Service Option for IS-2000
Implementation (contd..)
– Handling of CDMA-CDMA Hard Handoff:
– After a CDMA-CDMA hard handoff is completed, the TDSO shall re-initialize with the default data pattern (0xFF) and duty cycle (100%) on the configured channels till the next synchronization frame
– The FER/PER counters shall be reset to zero
– If the TDSO call in progress is a mobile originated call, at the first synchronization frame, the MS shall propose the pre-handoff test parameters to the BS in a Service Option Control Message
Page 19 Test Data Service Option for IS-2000
Implementation (contd..)
– FER/PER Calculation:
– FER - Frame error rate, PER- PDU error rate
– Transmit and receive frame counters maintained for each physical channel
– Receiving station reproduces the transmitted packets and compares them to the received packets
– Frame categories received during TX_OFF_PERIOD are also taken into account
– Dim-and-burst and blank-and-burst frames ignored in the FER calculation
– For the DCCH/FCH channels, PER = FER.
– Example: For F-FCH/DCCH, the equation for FER is:
TDSO_E1_R1m denotes the number of Rate 1 frames received when TDSO expects a Rate 1 frame (MS)TDSO_EN_RNm denotes the number of Null frames received when TDSO expects a Null frame (MS)TDSO_E1_T1b denotes the number of Rate1 frames transmitted when TDSO supplies a Rate 1 frame (BS)TDSO_EB_TBb denotes the number of Blank frames transmitted when TDSO supplies a Blank frame (BS)
Page 20 Test Data Service Option for IS-2000
Implementation (contd..)
– Conducting a TDSO test
– Start a TDSO call (or clear the counters of an existing call)
– To conduct a TDSO test with a random data source, set the DATA_SOURCE field to ‘1’ and CLEAR_COUNTERS field to ‘1’ in the SOCM based Control directive for the particular physical channel
– Wait for the test interval to elapse
– Direct the MS to make a copy of the counters
– Wait for the fwd. and rev. synchronization frame after the action time to occur
– Retrieve the values of the copied counters from the mobile station and compute the FER/PER
Page 21 Test Data Service Option for IS-2000
Example
– TDSO multiple channel operation:
– Logical to Physical Mapping for a TDSO call using FCH/DCCH/SCH
Logical Channel Physical Channels
dsch DCCH
dtch FCH, DCCH, SCH
Page 22 Test Data Service Option for IS-2000
Call Flows
Mobile Station Base Station
Detects user-initiated call
Sends Origination Messagespecifying the TDSO serviceoption
Table 1 Mobile station Origination example with transmission on DCCH/FCH/SCH (1 of 3)
Page 23 Test Data Service Option for IS-2000
Call Flows (contd..)
Mobile Station Base Station
Enters the ConversationSubstate, and connects theTDSO service option at theaction time specified in theService Connect Message.Generates Rate 1 packets (bydefault all 1s) from the time ofservice option connection to theframe prior to the firstsynchronization frame. At thefirst synchronization frame re-synchronizes the TDSO.
< dsch/dtch > Connects and initializes theTDSO service option followingthe action time specified in theService Connect Message.
Sends Supplemental ChannelRequest Message, and continuestransmitting on the ReverseFundicated Traffic Channels.
> r-dsch >
< dsch/dtch < Allocates SupplementalChannel(s) through ESCAM,FSCAMM, RSCAMM orUHDM.
(Continued on next page) (Continued on next page)
Table 2 Mobile station Origination example with transmission on DCCH/FCH/SCH (2 of 3)
Page 24 Test Data Service Option for IS-2000
Call Flows (contd..)
Mobile Station Base Station
Connects the TDSO at the actiontime specified in the SCHallocation message. GeneratesRate 1 packets (by default all 1s)from the time of service optionconnection to the frame prior tothe first synchronization frame.At the first synchronizationframe re-synchronizes theTDSO. Continues transmittingon the Reverse FundicatedChannels.
< dsch/dtch > Connects and initializes theTDSO service option followingthe action time specified in theESCAM, FSCAMM, RSCAMMor UHDM. Continuestransmission on the ForwardFundicated Channels.
(TDSO Traffic) (TDSO Traffic)
Table 3 Mobile station Origination example with transmission on DCCH/FCH/SCH (3 of 3)
Page 25 Test Data Service Option for IS-2000
Call Flows (contd..)
Mobile Station Base Station(TDSO Call Active)
< f-dsch/dtch <(TDSO Call Active)Sends Service Option ControlMessage specifying a new typeof data source and/ortransmission duty cycle on theSupplemental Channel.
Sends an acknowledgment
Accepts the new fields.Starts processing using the newdata source and/or duty cyclespecified in the Service OptionControl Message from the nextsynchronization frame on thespecified Supplemental channel.Continues to use the same TDSOconfiguration on the Fundicatedchannels.
(TDSO Traffic)
> r-dsch
dsch/dtch
>
Starts processing TDSO trafficthe new using the new datasource and/or duty cycle fromthe next synchronization frameon the Supplemental Channel.Continues to use the sameTDSO configuration on theFundicated channels.
(TDSO Traffic)Table 4 Base Station Commanded Test Parameters change
Page 26 Test Data Service Option for IS-2000
– Service Option number TBD
– Flexible rate/Variable rate operation in next revision
