Method and apparatus for formatting a message in a wireless...

Details Method and apparatus for formatting a message in a wireless... Method and apparatus for formatting a message in a wireless...

2000-08-08

2003-09-16

Decady, Albert (Department: 2133)

Error detection/correction and fault detection/recovery

Pulse or data error handling

Digital data error correction

C714S776000

Reexamination Certificate

active

06622278

ABSTRACT:

FIELD OF THE INVENTION
The present invention pertains to communication methods and devices, and more particularly to an improved method and device for formatting a message.
BACKGROUND OF THE INVENTION
The signaling frame (such as the DCCH frame in IS2000 systems) used to transmit a signaling message over a cellular system, such as a code division multiple access (CDMA) system or a time division multiple access (TDMA) system, typically includes a frame header, a message slot, a code redundancy check (CRC) etc. It is known for the message slot to have a predetermined length, and it is further known for the frame to have a predetermined length. For example, IS-95 and IS-2000, which are the current 2G and 3G CDMA standards in the United States, have a predetermined message slot length. On the other hand, signaling messages may have varying lengths and under the standard, the leftover space is not used. Clearly, for short messages the waste of resources can be significant. Table 1 lists different message sizes for IS2000 systems.
TABLE 1
Message lengths.
Message body
MuxPDU Type 1
MuxPDU Type 2
Message name
length
leftover bits
Leftover bits
Base Station
80
57
161
Challenge Order
SSD Update
48
89
193
Confirmation
Order
SSD Update
48
89
193
Rejection Order
Parameter Update
48
89
193
Confirmation
Order
Mobile station
48
89
193
Ack Order
Service Option
64
73
177
Request Order
Service Option
58
73
177
response
Release Order
48
89
193
(Normal)
Release Order
48
89
193
(w/Power Down)
Long code
48
89
193
transition
response order
(use public)
Connect order
48
89
193
Continuous
48
89
193
DTMF tone Order
Continuous
48
89
193
DTMF
tone order (stop)
Service option
48
89
193
control order
Mobile station
56
81
185
reject order
Authentication
40
97
201
Challenge
response
message
Pilot Strength
104
33
137
Measurement
message
Power
64
73
177
measurement
report message
Send Burst
72
65
169
DTMF message
Handoff
48
89
193
completion
message
Service connect
24
113
217
completion
message
TMSI assignment
16
121
225
message
Candidate
56
81
185
frequency
search response
message
Outer loop report
40
97
201
message
Resource request
24
113
217
message
Extended release
16
121
225
response message
Mobile station
32
105
209
resource release
request message
Table 1 assumptions: P_REV_IN_USE>=7, Encryption off, 3 Pilots visible to MS, DTMF burst of 10 digits.
As can be seen from the table, the messages have varying lengths, and the shorter messages do not use the full frame length. Accordingly, available bandwidth is wasted when shorter messages are transmitted.
The standard technique for recovering a message at the receiver is to check the frame CRC first after decoding the frame. If the frame CRC fails, the message is discarded, or erased. If the frame CRC is good, the message CRC is checked. If the message CRC fails, the message is discarded. Otherwise, the message is retained. Erased signal frames can translate into dropped calls, radio frequency (RF) power overruns, and user dissatisfaction. For example, when checking voice mail, keyed-in digits are sent over a signaling frame and the frame is erased. The phone display shows that the correct number was entered, but the user has to reenter them when the correct numbers are not received at the central server. Users can find such performance aggravating.
Accordingly, there is a need for an improved messaging format to enable more reliable communication.


REFERENCES:
patent: 4032886 (1977-06-01), En et al.
patent: 5563895 (1996-10-01), Malkamaki et al.
patent: 5844918 (1998-12-01), Kato
patent: 6173431 (2001-01-01), Rittle

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