US5854977A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Call transfer and simplex call capability in a residential system using wireless residential extension handsets
Assignee: Nokia Solutions and Networks Oy
•
Filing: 1996-01-11
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Granted: 1998-12-29
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Expires: 2016-01-11
Abstract
Abstract A wireless communications system (1) has at least one base station, such as a personal base station (5), and a plurality of mobile stations (10) capable of wireless communications with the at least one personal base station. In response to input from a user of a first mobile station, a first step of a method transmits a message from the first mobile station to the personal base station, the message including a request for service and information specifying another mobile station. The message is received at the personal base station and the request for service is interpreted as being one of a plurality of types. In one embodiment the message is interpreted in accordance with a state of the mobile station when transmitting the message. By example, the request for service is interpreted as a request to establish a simplex connection between the first mobile station and another mobile station, when the first mobile station is in an idle state, or as a request to transfer an on-going call from the first mobile station to another mobile station, when the first mobile station is in a conversation state. A next step of the method contacts at least one other mobile station from the personal base station for one of establishing the simplex connection and transferring the on-going call.
Inventors
- 👤 Markku Oksanen
- 👤 Juha Peranto
- 👤 Seppo Alanara
- 👤 Teppo Jylanki
- 👤 Pekka Liukkonen
- 👤 Kalevi Malmi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:55
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/72; H04M1/725; H04M1/72502; H04M1/72505; H04W; H04W76/00; H04W76/20; H04W4/00; H04W4/16
Claims Analysis
Total Claims: 62
Claim 1
Independent Claim
126 words
A method of operating a wireless communications system having at least one base station and a plurality of mobile stations capable of wireless communications with the at least one base station, comprising the steps of: in response to input from a user of a first mobile station, transmitting a message from the first mobile station to the base station, the message including a request for service; receiving the message at the base station and interpreting the request for service as being one of a first type of request and a second type of request in accordance with a state of the first mobile station at a time that the message was transmitted; and performing the requested service in cooperation with at least one second mobile station.
Claim 2
Independent Claim
126 words
A method of operating a wireless communications system having at least one base station and a plurality of mobile stations capable of wireless communications with the at least one base station, comprising the steps of: in response to input from a user of a first mobile station, transmitting a message from the first mobile station to the base station, the message including a request for service; receiving the message at the base station and interpreting the request for service as being one of a first type of request and a second type of request in accordance with a state of the first mobile station at a time that the message was transmitted; and performing the requested service in cooperation with at least one second mobile station.
Claim 3
Dependent Claim
24 words
A method as set forth in claim 1, wherein the message further includes information specifying an identity of at least one second mobile station.
Claim 4
Dependent Claim
35 words
A method as set forth in claim 2, wherein the first type of request is a request to establish a connection between the first mobile station and the specified at least one second mobile station.
Claim 5
Dependent Claim
36 words
A method as set forth in claim 2, wherein the second type of request is a request to transfer an on-going call from the first mobile station to the specified at least one second mobile station.
Claim 6
Dependent Claim
86 words
A method as set forth in claim 2, wherein the request for service is interpreted as a request to establish a simplex connection between the first mobile station and the specified at least one second mobile station, when the first mobile station is in an idle state; and wherein the request for service is interpreted as request to transfer an on-going call from the first mobile station to the specified at least one second mobile station, when the first mobile station is in a conversation state.
Claim 7
Dependent Claim
69 words
A method as set forth in claim 2, wherein the first type of request is a request to establish a simplex connection between the first mobile station and the specified at least one second mobile station, and wherein one of the mobile stations transmitting to the other mobile station through the base station also transmits an indication of when a transmitter of the mobile station will be turned off.
Claim 8
Dependent Claim
39 words
A method as set forth in claim 6, wherein the indication is transmitted as a sub-audible bit stream having a first bit pattern during the transmission and a second bit pattern just prior to the transmitter being turned off.
Claim 9
Dependent Claim
31 words
A method as set forth in claim 7, wherein the base station is responsive to the second bit pattern for muting a connection between base station receiver and transmitter audio paths.
Claim 10
Dependent Claim
18 words
A method as set forth in claim 1, wherein the base station has one transmitter and one receiver.
Claim 11
Independent Claim
176 words
A method of operating a wireless communications system having at least one personal base station and a plurality of mobile stations capable of wireless communications with the at least one personal base station, comprising the steps of: in response to input from a user of a first mobile station, transmitting a message from the first mobile station to the personal base station, the message including a request for service; receiving the message at the personal base station and interpreting the request for service as a request to establish a simplex connection between the first mobile station and another mobile station, when the first mobile station is in an idle state when making the request, and interpreting the request for service as a request to transfer an on-going call from the first mobile station to another mobile station, when the first mobile station is in a conversation state when making the request; and contacting at least one other mobile station from the personal base station for one of establishing the simplex connection and transferring the on-going call.
Claim 12
Independent Claim
176 words
A method of operating a wireless communications system having at least one personal base station and a plurality of mobile stations capable of wireless communications with the at least one personal base station, comprising the steps of: in response to input from a user of a first mobile station, transmitting a message from the first mobile station to the personal base station, the message including a request for service; receiving the message at the personal base station and interpreting the request for service as a request to establish a simplex connection between the first mobile station and another mobile station, when the first mobile station is in an idle state when making the request, and interpreting the request for service as a request to transfer an on-going call from the first mobile station to another mobile station, when the first mobile station is in a conversation state when making the request; and contacting at least one other mobile station from the personal base station for one of establishing the simplex connection and transferring the on-going call.
Claim 13
Dependent Claim
18 words
A method as set forth in claim 10, wherein the message further includes information specifying another mobile station.
Claim 14
Dependent Claim
81 words
A method as set forth in claim 10, wherein the during a simplex connection a transmitting mobile station transmits a sub-audible bit stream having a first bit pattern during the transmission and transmits a second bit pattern just prior to a transmitter of the mobile station being turned off, and wherein the personal base station is responsive to the second bit pattern for muting a connection between a personal base station receiver audio path and a base station transmitter audio path.
Claim 15
Dependent Claim
19 words
A method as set forth in claim 10, wherein the personal base station has one transmitter and one receiver.
Claim 16
Independent Claim
222 words
A method of operating a wireless communications system having at least one personal base station and a plurality of mobile stations capable of wireless communications with the at least one personal base station, comprising the steps of: in response to input from a user of a first mobile station, transmitting a message from the first mobile station to the personal base station, the message including a request for service; receiving the message at the personal base station and interpreting the request for service as a request to establish a simplex connection between the first mobile station and another mobile station, when the first mobile station is in an idle state when making the request, and interpreting the request for service as a request to transfer an on-going call from the first mobile station to another mobile station, when the first mobile station is in a conversation state when making the request; and contacting at least one other mobile station from the personal base station for one of establishing the simplex connection and transferring the on-going call, wherein the message further specifies a plurality of other mobile stations, wherein the personal base station pages a plurality of other mobile stations, and wherein the simplex connection or the transfer of the on-going call is made with the first mobile station to answer the page.
Claim 17
Independent Claim
222 words
A method of operating a wireless communications system having at least one personal base station and a plurality of mobile stations capable of wireless communications with the at least one personal base station, comprising the steps of: in response to input from a user of a first mobile station, transmitting a message from the first mobile station to the personal base station, the message including a request for service; receiving the message at the personal base station and interpreting the request for service as a request to establish a simplex connection between the first mobile station and another mobile station, when the first mobile station is in an idle state when making the request, and interpreting the request for service as a request to transfer an on-going call from the first mobile station to another mobile station, when the first mobile station is in a conversation state when making the request; and contacting at least one other mobile station from the personal base station for one of establishing the simplex connection and transferring the on-going call, wherein the message further specifies a plurality of other mobile stations, wherein the personal base station pages a plurality of other mobile stations, and wherein the simplex connection or the transfer of the on-going call is made with the first mobile station to answer the page.
Claim 18
Dependent Claim
181 words
A wireless communications system, comprising: at least one personal base station and a plurality of mobile stations capable of wireless communications with the at least one personal base station; individual ones of said mobile stations including means, responsive to input from a user, for composing and transmitting a message to the personal base station, the message including a request for service; said personal base station comprising means for receiving the message from the transmitting mobile station and for interpreting the request for service as a request to establish a simplex connection between the transmitting mobile station and another mobile station, when the transmitting mobile station is in an idle state when making the request, and interpreting the request for service as a request to transfer an on-going call from the transmitting mobile station to another mobile station, when the transmitting mobile station is in a conversation state when making the request; said personal base station further comprising means for transmitting a message to at least one other mobile station for one of establishing the simplex connection and transferring the on-going call.
Claim 19
Dependent Claim
181 words
A wireless communications system, comprising: at least one personal base station and a plurality of mobile stations capable of wireless communications with the at least one personal base station; individual ones of said mobile stations including means, responsive to input from a user, for composing and transmitting a message to the personal base station, the message including a request for service; said personal base station comprising means for receiving the message from the transmitting mobile station and for interpreting the request for service as a request to establish a simplex connection between the transmitting mobile station and another mobile station, when the transmitting mobile station is in an idle state when making the request, and interpreting the request for service as a request to transfer an on-going call from the transmitting mobile station to another mobile station, when the transmitting mobile station is in a conversation state when making the request; said personal base station further comprising means for transmitting a message to at least one other mobile station for one of establishing the simplex connection and transferring the on-going call.
Claim 20
Dependent Claim
18 words
A system as set forth in claim 15, wherein the message further includes information specifying another mobile station.
Claim 21
Dependent Claim
80 words
A system as set forth in claim 15, wherein during a simplex connection a mobile station transmits a subaudible bit stream having a first bit pattern during a voice transmission and transmits a second bit pattern just prior to a transmitter of the mobile station being turned off, and wherein said personal base station is responsive to the second bit pattern for muting a connection between a personal base station receiver audio path and a base station transmitter audio path.
Claim 22
Dependent Claim
19 words
A system as set forth in claim 15, wherein the personal base station has one transmitter and one receiver.
Claim 23
Dependent Claim
227 words
A wireless communications system, comprising: at least one personal base station and a plurality of mobile stations capable of wireless communications with the at least one personal base station; individual ones of said mobile stations including means, responsive to input from a user, for composing and transmitting a message to the personal base station, the message including a request for service; said personal base station comprising means for receiving the message from the transmitting mobile station and for interpreting the request for service as a request to establish a simplex connection between the transmitting mobile station and another mobile station, when the transmitting mobile station is in an idle state when making the request, and interpreting the request for service as a request to transfer an on-going call from the transmitting mobile station to another mobile station, when the transmitting mobile station is in a conversation state when making the request; said personal base station further comprising means for transmitting a message to at least one other mobile station for one of establishing the simplex connection and transferring the on-going call, wherein the message further specifies a plurality of other mobile stations, wherein the personal base station pages a plurality of other mobile stations, and wherein the simplex connection or the transfer of the on-going call is made with the first mobile station to answer the page.
Claim 24
Dependent Claim
227 words
A wireless communications system, comprising: at least one personal base station and a plurality of mobile stations capable of wireless communications with the at least one personal base station; individual ones of said mobile stations including means, responsive to input from a user, for composing and transmitting a message to the personal base station, the message including a request for service; said personal base station comprising means for receiving the message from the transmitting mobile station and for interpreting the request for service as a request to establish a simplex connection between the transmitting mobile station and another mobile station, when the transmitting mobile station is in an idle state when making the request, and interpreting the request for service as a request to transfer an on-going call from the transmitting mobile station to another mobile station, when the transmitting mobile station is in a conversation state when making the request; said personal base station further comprising means for transmitting a message to at least one other mobile station for one of establishing the simplex connection and transferring the on-going call, wherein the message further specifies a plurality of other mobile stations, wherein the personal base station pages a plurality of other mobile stations, and wherein the simplex connection or the transfer of the on-going call is made with the first mobile station to answer the page.
Claim 25
Independent Claim
100 words
A method of operating a wireless communications system having at least one base station and a plurality of mobile stations capable of wireless communications with the at least one base station, comprising the steps of: in response to input from a user of a first mobile station, transmitting a message from the first mobile station to the base station, the message including a request for service; and receiving the message at the base station and interpreting the request for service as being a request to establish a connection between the first mobile station and at least one second mobile station.
Claim 26
Independent Claim
100 words
A method of operating a wireless communications system having at least one base station and a plurality of mobile stations capable of wireless communications with the at least one base station, comprising the steps of: in response to input from a user of a first mobile station, transmitting a message from the first mobile station to the base station, the message including a request for service; and receiving the message at the base station and interpreting the request for service as being a request to establish a connection between the first mobile station and at least one second mobile station.
Claim 27
Dependent Claim
21 words
A method as set forth in claim 20, wherein the message further includes information specifying at least one second mobile station.
Claim 28
Dependent Claim
61 words
A method as set forth in claim 21, wherein the request for service is interpreted as a request to establish a simplex connection between the first mobile station and the specified at least one second mobile station, and further comprising a step of coupling a receive audio path of the base station to a transmit audio path of the base station.
Claim 29
Dependent Claim
41 words
A method as set forth in claim 20, and wherein one of the mobile stations transmitting to the other mobile station through the base station also transmits an indication of when a transmitter of the mobile station will be turned off.
Claim 30
Dependent Claim
39 words
A method as set forth in claim 23, wherein the indication is transmitted as a sub-audible bit stream having a first bit pattern during the transmission and a second bit pattern just prior to the transmitter being turned off.
Claim 31
Dependent Claim
36 words
A method as set forth in claim 24, wherein the base station is responsive to the second bit pattern for muting a connection between a base receiver audio path and a base station transmitter audio path.
Claim 32
Dependent Claim
19 words
A method as set forth in claim 23, wherein the indication is transmitted as a wide bandwidth data message.
Claim 33
Dependent Claim
23 words
A method as set forth in claim 23, wherein the indication is transmitted as a change in a Supervisory Audio Tone (SAT) frequency.
Claim 34
Dependent Claim
27 words
A method as set forth in claim 23, wherein the indication is transmitted as a change in a presence or absence of a Supervisory Audio Tone (SAT).
Claim 35
Dependent Claim
44 words
A method as set forth in claim 20, wherein the input from the user of the first mobile station is made by depressing a selected keypad key for a predetermined period of time, the selected keypad key specifying at least one second mobile station.
Claim 36
Dependent Claim
18 words
A method as set forth in claim 20, wherein the base station has one transmitter and one receiver.
Claim 37
Independent Claim
137 words
A method of operating a wireless communications system having at least one base station and a plurality of mobile stations capable of wireless communications with the at least one base station, comprising the steps of: in response to input from a user of a first mobile station, transmitting a message from the first mobile station to the base station, the message including a request for service; and receiving the message at the base station and interpreting the request for service, in accordance with a state of the first mobile station when the message was transmitted, as being either a first type of request to transfer an on-going call from the first mobile station to at least one second mobile station or a second type of request to connect the first mobile station to a second mobile station.
Claim 38
Independent Claim
137 words
A method of operating a wireless communications system having at least one base station and a plurality of mobile stations capable of wireless communications with the at least one base station, comprising the steps of: in response to input from a user of a first mobile station, transmitting a message from the first mobile station to the base station, the message including a request for service; and receiving the message at the base station and interpreting the request for service, in accordance with a state of the first mobile station when the message was transmitted, as being either a first type of request to transfer an on-going call from the first mobile station to at least one second mobile station or a second type of request to connect the first mobile station to a second mobile station.
Claim 39
Dependent Claim
21 words
A method as set forth in claim 31, wherein the message further includes information specifying at least one second mobile station.
Claim 40
Dependent Claim
44 words
A method as set forth in claim 31, wherein the input from the user of the first mobile station is made by depressing a selected keypad key for a predetermined period of time, the selected keypad key specifying at least one second mobile station.
Claim 41
Dependent Claim
63 words
A method as set forth in claim 32, and for the first type of request further comprising the steps of: sending a message from the base station to the at least one specified second mobile station for causing the at least one specified second mobile station to generate an alerting indicator; and transferring the call when a user responds to the alerting indicator.
Claim 42
Dependent Claim
121 words
A method as set forth in claim 32, and for the first type of request further comprising the steps of: sending a message from the base station to the at least one specified second mobile station for causing the at least one specified second mobile station to generate an alerting indicator; waiting for a period of time for a user respond to the alerting indicator; if the user does not respond to the alerting indicator, sending a message from the base station to the first mobile station for causing the first mobile station to generate an alerting indicator; and transferring the call back to the first mobile station when the user of the first mobile station responds to the alerting indicator.
Claim 43
Independent Claim
222 words
A method of operating a wireless communications system having at least one base station and a plurality of mobile stations capable of wireless communications with the at least one base station, comprising the steps of: in response to input from a user of a first mobile station, transmitting a message from the first mobile station to the base station, the message including a request for service; and receiving the message at the base station and interpreting the request for service as being a request to transfer an on-going call from the first mobile station to at least one second mobile station; wherein the message further includes information specifying at least one second mobile station; and further comprising the steps of, sending a message from the base station to the at least one specified second mobile station for causing the at least one specified second mobile station to generate an alerting indicator; waiting for a period of time for a user respond to the alerting indicator; if the user does not respond to the alerting indicator, sending a message from the base station to a plurality of mobile stations for causing each of the plurality of mobile stations to generate an alerting indicator; and transferring the call to the first one of the plurality of mobile stations that responds to the alerting indicator.
Claim 44
Independent Claim
222 words
A method of operating a wireless communications system having at least one base station and a plurality of mobile stations capable of wireless communications with the at least one base station, comprising the steps of: in response to input from a user of a first mobile station, transmitting a message from the first mobile station to the base station, the message including a request for service; and receiving the message at the base station and interpreting the request for service as being a request to transfer an on-going call from the first mobile station to at least one second mobile station; wherein the message further includes information specifying at least one second mobile station; and further comprising the steps of, sending a message from the base station to the at least one specified second mobile station for causing the at least one specified second mobile station to generate an alerting indicator; waiting for a period of time for a user respond to the alerting indicator; if the user does not respond to the alerting indicator, sending a message from the base station to a plurality of mobile stations for causing each of the plurality of mobile stations to generate an alerting indicator; and transferring the call to the first one of the plurality of mobile stations that responds to the alerting indicator.
Claim 45
Dependent Claim
78 words
A mobile station for use in a wireless communications system that includes at least one base station, said mobile station comprising: a user interface; and means, coupled to said user interface and responsive to input from a user, for composing and transmitting a message to the base station, the message specifying at least one of a request to establish a simplex connection with another mobile station and a request to transfer an on-going call to another mobile station.
Claim 46
Dependent Claim
78 words
A mobile station for use in a wireless communications system that includes at least one base station, said mobile station comprising: a user interface; and means, coupled to said user interface and responsive to input from a user, for composing and transmitting a message to the base station, the message specifying at least one of a request to establish a simplex connection with another mobile station and a request to transfer an on-going call to another mobile station.
Claim 47
Dependent Claim
34 words
A mobile station as set forth in claim 37, wherein the message further includes information for specifying another mobile station with which to establish the simplex connection or to which to transfer the call.
Claim 48
Dependent Claim
96 words
A base station for use in a wireless communications system that includes a plurality of mobile stations, said base station comprising: means for receiving a message transmitted from a mobile station; means for interpreting the received message as one of a request to establish a simplex connection between the mobile station and another mobile station and a request to transfer an on-going call from the mobile station to another mobile station; and means for transmitting a message to at least one other mobile station for one of establishing the simplex connection and transferring the on-going call.
Claim 49
Dependent Claim
96 words
A base station for use in a wireless communications system that includes a plurality of mobile stations, said base station comprising: means for receiving a message transmitted from a mobile station; means for interpreting the received message as one of a request to establish a simplex connection between the mobile station and another mobile station and a request to transfer an on-going call from the mobile station to another mobile station; and means for transmitting a message to at least one other mobile station for one of establishing the simplex connection and transferring the on-going call.
Claim 50
Dependent Claim
61 words
A base station as set forth in claim 39, wherein said interpreting means is responsive to the mobile station being in an idle state for interpreting the message as a request to establish the simplex connection, and is further responsive to the mobile station being in a conversation state for interpreting the message as a request to transfer the on-going call.
Claim 51
Dependent Claim
30 words
A base station as set forth in claim 39, wherein the base station is further comprised of one transmitter and one receiver for communicating with said plurality of mobile stations.
Claim 52
Dependent Claim
88 words
A mobile station for use in a wireless communications system that includes at least one base station, said mobile station comprising a transmitter and further comprising: a user interface; means, coupled to said user interface and responsive to input from a user, for composing and transmitting a message to the base station for requesting a simplex call connection to another mobile station operable with said base station; and transmitter control means, coupled to said transmitter, for turning said transmitter off and on during a simplex call conversation state.
Claim 53
Dependent Claim
88 words
A mobile station for use in a wireless communications system that includes at least one base station, said mobile station comprising a transmitter and further comprising: a user interface; means, coupled to said user interface and responsive to input from a user, for composing and transmitting a message to the base station for requesting a simplex call connection to another mobile station operable with said base station; and transmitter control means, coupled to said transmitter, for turning said transmitter off and on during a simplex call conversation state.
Claim 54
Dependent Claim
41 words
A mobile station as set forth in claim 42, wherein said transmitter control means is responsive to a voice signal received from a microphone of the mobile station for turning said transmitter off and on during the simplex call conversation state.
Claim 55
Dependent Claim
33 words
A mobile station as set forth in claim 42, wherein said transmitter control means is responsive to a key depression for turning said transmitter off and on during the simplex call conversation state.
Claim 56
Dependent Claim
28 words
A mobile station as set forth in claim 44, wherein said key is at least one key of a keypad that comprises a portion of said user interface.
Claim 57
Dependent Claim
32 words
A mobile station as set forth in claim 42, wherein said mobile station further comprises means for transmitting an indication to said base station that said transmitter is to be turned off.
Claim 58
Dependent Claim
120 words
A base station for use in a wireless communications system that includes a plurality of wireless handsets, said base station comprising a receiver audio path and a transmitter audio path and further comprising: means for receiving a message transmitted from an originating wireless handset; means for interpreting the received message as a request to establish a simplex connection between the originating wireless handset and a second wireless handset authorized to operate with the base station; and means for alerting the second wireless handset and, in response to the second wireless handset responding to the alert, for establishing a simplex call connection between the originating wireless handset and the second wireless handset by coupling together said receiver and transmitter audio paths.
Claim 59
Dependent Claim
120 words
A base station for use in a wireless communications system that includes a plurality of wireless handsets, said base station comprising a receiver audio path and a transmitter audio path and further comprising: means for receiving a message transmitted from an originating wireless handset; means for interpreting the received message as a request to establish a simplex connection between the originating wireless handset and a second wireless handset authorized to operate with the base station; and means for alerting the second wireless handset and, in response to the second wireless handset responding to the alert, for establishing a simplex call connection between the originating wireless handset and the second wireless handset by coupling together said receiver and transmitter audio paths.
Claim 60
Dependent Claim
43 words
A base station as set forth in claim 47, wherein said base station further comprises means for muting an audio connection between said receiver and transmitter audio paths in response to a message received from one of said originating and second wireless handsets.
Claim 61
Dependent Claim
226 words
A base station for use in a wireless communications system that includes a plurality of wireless handsets, said base station comprising: means for receiving a message transmitted from an originating wireless handset; means for interpreting the received message, in accordance with a state of the originating wireless handset when the message was transmitted, as a first type of request to make a connection between the originating wireless handset and a second wireless handset authorized to operate with the base station or as a second type of request to make a call transfer between the originating wireless handset and a second wireless handset authorized to operate with the base station; means for alerting the second wireless handset and, in response to the second wireless handset responding to the alert, for the second type of request transferring a call that is currently connected to the originating wireless handset to the second wireless handset; and means for determining that the second wireless handset is currently registered with the base station prior to alerting the second wireless handset; wherein if the second wireless handset is determined to not be currently registered with the base station, for the case of the second type of request the base station sends an alerting message back to the originating wireless handset so that the call can be transferred back to the originating wireless handset.
Claim 62
Dependent Claim
226 words
A base station for use in a wireless communications system that includes a plurality of wireless handsets, said base station comprising: means for receiving a message transmitted from an originating wireless handset; means for interpreting the received message, in accordance with a state of the originating wireless handset when the message was transmitted, as a first type of request to make a connection between the originating wireless handset and a second wireless handset authorized to operate with the base station or as a second type of request to make a call transfer between the originating wireless handset and a second wireless handset authorized to operate with the base station; means for alerting the second wireless handset and, in response to the second wireless handset responding to the alert, for the second type of request transferring a call that is currently connected to the originating wireless handset to the second wireless handset; and means for determining that the second wireless handset is currently registered with the base station prior to alerting the second wireless handset; wherein if the second wireless handset is determined to not be currently registered with the base station, for the case of the second type of request the base station sends an alerting message back to the originating wireless handset so that the call can be transferred back to the originating wireless handset.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
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| 3.5 Years (Year 4) | 2001-12-28 | 2002-06-29 | 2002-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-12-28 | 2006-06-29 | 2006-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-12-28 | 2010-06-29 | 2010-12-29 | $7700.00 | Window Closed / Lapsed |