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US6115388A
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Establishment of multiple low-rate inbound signaling links in CDMA dispatch system
Assignee: Google Technology Holdings LLC
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Filing: 1997-10-28
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Granted: 2000-09-05
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Expires: 2017-10-28
Abstract
Abstract A quality dispatch service on a CDMA based wireless system. To achieve spectral efficiency and fast access for follow-up calls, in response to a request by a talkgroup member to have a group call established, the non-requesting (listening-only) members are allowed to establish a low-rate (non-voice) signaling link in the reverse direction (inbound) for the limited purpose of (i) providing forward power control information to the fixed infrastructure; (ii) requesting soft hand-off when required; and (iii) maintaining the correct reverse link power control to allow for fast channel access for a follow-on call. In accordance with the illustrative embodiment, the establishment of low-rate inbound signaling links occurs prior to beginning the voice communications. Because a low-rate signaling link, as contemplated by the present invention, is a non-voice link which signals at a predetermined rate substantially less than that of a full-rate traffic link, proportionately less average power is required for dispatch communications than would otherwise be the case if full-rate traffic links were provided instead to non-talking talkgroup members. The present solution results in less interference to the CDMA system and thus substantially less impact on overall system capacity.
Inventors
- 👤 Leigh M. Chinitz
- 👤 Michael L. Needham
- 👤 Timothy J. Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:09
CPC Classifications
H; H04; H04W; H04W84/00; H04W84/02; H04W84/04; H04W84/08; H04B; H04B7/00; H04B7/24; H04B7/26; H04B7/2628; H04B7/264; H04W72/00; H04W72/30; H04W76/00; H04W76/10
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
212 words
In a CDMA dispatch communication system comprising a fixed infrastructure and a plurality of subscribers units engaged in a group call wherein at least a plurality of group members, including a second group member, are listening to the group call on the same outbound link from the fixed infrastructure, and wherein a first group member is transmitting a signal on an inbound link to the fixed infrastructure, a method of establishing multiple low-rate inbound links comprising the fixed infrastructure performed steps of: detecting a request by the subscriber unit of the first group member for a group call; establishing a full-rate traffic inbound link with the subscriber unit of the first group member for transmitting a signal to the fixed infrastructure; establishing a full-rate traffic outbound link with the subscriber units of each of the at least a plurality of group members so they can receive the signal from the fixed infrastructure; and prior to transmitting the signal from the first group member to the fixed infrastructure, establishing for each the at least a plurality of group members, including the second group member, a low-rate inbound link, different from said full-rate traffic inbound link, for receiving at least one of forward power control information, soft hand-off information and reverse power information therefrom.
Claim 2
Dependent Claim
212 words
In a CDMA dispatch communication system comprising a fixed infrastructure and a plurality of subscribers units engaged in a group call wherein at least a plurality of group members, including a second group member, are listening to the group call on the same outbound link from the fixed infrastructure, and wherein a first group member is transmitting a signal on an inbound link to the fixed infrastructure, a method of establishing multiple low-rate inbound links comprising the fixed infrastructure performed steps of: detecting a request by the subscriber unit of the first group member for a group call; establishing a full-rate traffic inbound link with the subscriber unit of the first group member for transmitting a signal to the fixed infrastructure; establishing a full-rate traffic outbound link with the subscriber units of each of the at least a plurality of group members so they can receive the signal from the fixed infrastructure; and prior to transmitting the signal from the first group member to the fixed infrastructure, establishing for each the at least a plurality of group members, including the second group member, a low-rate inbound link, different from said full-rate traffic inbound link, for receiving at least one of forward power control information, soft hand-off information and reverse power information therefrom.
Claim 3
Dependent Claim
27 words
The method of claim 1, wherein the step of establishing inbound links with each group member involves identifying a unique code associated with a corresponding subscriber unit.
Claim 4
Dependent Claim
31 words
The method of claim 2, wherein the step of identifying a unique code associated with a corresponding subscriber unit involves selecting the unique codes from an associated talkgroup list of codes.
Claim 5
Dependent Claim
38 words
The method of claim 2, wherein the step of identifying a unique code associated with a corresponding subscriber unit involves receiving code information from the subscriber unit of each group member wishing to participate in the group call.
Claim 6
Dependent Claim
37 words
The method of claim 1, wherein the step of establishing low-rate inbound links with each of the at least a plurality of group members involves monitoring the low-rate inbound links while the full-rate inbound link is active.
Claim 7
Dependent Claim
160 words
In a CDMA dispatch communication system comprising a fixed infrastructure and a plurality of subscribers units engaged in a group call wherein at least a plurality of group members, including a second group member, are listening to the group call on the same outbound link from the fixed infrastructure, and wherein a first group member is transmitting a signal on an inbound link to the fixed infrastructure, a method of establishing a low-rate inbound link, the method comprising the subscriber unit performed steps of: receiving notification from the fixed infrastructure that a group call is being setup; establishing a full-rate traffic outbound link for monitoring signals transmitted from the fixed infrastructure; and prior to receiving the signal from the fixed infrastructure on the full-rate traffic outbound link, establishing a low-rate inbound link, different from said full-rate traffic inbound link, for communicating at least one of forward power control information, soft hand-off information and reverse power information to the fixed infrastructure.
Claim 8
Dependent Claim
160 words
In a CDMA dispatch communication system comprising a fixed infrastructure and a plurality of subscribers units engaged in a group call wherein at least a plurality of group members, including a second group member, are listening to the group call on the same outbound link from the fixed infrastructure, and wherein a first group member is transmitting a signal on an inbound link to the fixed infrastructure, a method of establishing a low-rate inbound link, the method comprising the subscriber unit performed steps of: receiving notification from the fixed infrastructure that a group call is being setup; establishing a full-rate traffic outbound link for monitoring signals transmitted from the fixed infrastructure; and prior to receiving the signal from the fixed infrastructure on the full-rate traffic outbound link, establishing a low-rate inbound link, different from said full-rate traffic inbound link, for communicating at least one of forward power control information, soft hand-off information and reverse power information to the fixed infrastructure.
Claim 9
Dependent Claim
36 words
The method of claim 6, wherein the step of establishing an inbound link involves sending by the subscriber unit a unique code associated therewith used for encoding the information sent over the associated low-rate inbound link.
Claim 10
Dependent Claim
41 words
The method of claim 6, wherein when the second group member detects that the first group member has stopped transmitting, the second group member transmits a signal over the fixed infrastructure to the other group members using a full-rate inbound link.
Claim 11
Dependent Claim
200 words
A fixed infrastructure for facilitating CDMA dispatch service among a plurality of subscribers units engaged in a group call wherein at least a plurality of group members, including a second group member, are listening to the group call on the same outbound link from the fixed infrastructure when a first group member is transmitting a signal on an inbound link to the fixed infrastructure, the fixed infrastructure comprising: means for detecting a request by the subscriber unit of the first group member for a group call; means for establishing a full-rate traffic inbound link with the subscriber unit of the first group member; means for establishing a full-rate traffic outbound link with the subscriber units of each of the other group members so they can receive the signal from the first group member; and means for establishing for each of said at least a plurality of group members, including the second group member, and prior to transmitting the signal from the first group member to the group members, a low-rate inbound link, different from said full-rate traffic inbound link, for receiving at least one of forward power control information, soft hand-off information and reverse power information from each group member.
Claim 12
Dependent Claim
200 words
A fixed infrastructure for facilitating CDMA dispatch service among a plurality of subscribers units engaged in a group call wherein at least a plurality of group members, including a second group member, are listening to the group call on the same outbound link from the fixed infrastructure when a first group member is transmitting a signal on an inbound link to the fixed infrastructure, the fixed infrastructure comprising: means for detecting a request by the subscriber unit of the first group member for a group call; means for establishing a full-rate traffic inbound link with the subscriber unit of the first group member; means for establishing a full-rate traffic outbound link with the subscriber units of each of the other group members so they can receive the signal from the first group member; and means for establishing for each of said at least a plurality of group members, including the second group member, and prior to transmitting the signal from the first group member to the group members, a low-rate inbound link, different from said full-rate traffic inbound link, for receiving at least one of forward power control information, soft hand-off information and reverse power information from each group member.
Claim 13
Dependent Claim
30 words
The fixed infrastructure of claim 9, wherein the means for establishing inbound links with each group member includes means for identifying a unique code associated with a corresponding subscriber unit.
Claim 14
Dependent Claim
32 words
The fixed infrastructure of claim 10, wherein the means for identifying a unique code associated with a corresponding subscriber unit involves selecting the unique codes from an associated talkgroup list of codes.
Claim 15
Dependent Claim
39 words
The fixed infrastructure of claim 10, wherein the means for identifying a unique code associated with a corresponding subscriber unit involves receiving code information from the subscriber unit of each group member wishing to participate in the group call.
Claim 16
Dependent Claim
33 words
The fixed infrastructure of claim 9, wherein the means for establishing low-rate inbound links with each group member includes means for monitoring the low-rate inbound links while the full-rate inbound link is active.
Claim 17
Dependent Claim
161 words
A subscriber unit for use with a CDMA dispatch communication system having a fixed infrastructure providing dispatch service among a plurality of subscribers units engaged in a group call wherein at least a plurality of group members, including a second group member, are listening to the group call on the same outbound link from the fixed infrastructure when a first group member is transmitting a signal on an inbound link to the fixed infrastructure, the subscriber unit comprising: means for receiving notification from the fixed infrastructure that a group call is being setup; means for establishing a full-rate traffic outbound link for monitoring signals transmitted from the fixed infrastructure; and means for establishing a low-rate inbound link, different from said full-rate traffic inbound link, and prior to receiving the signal from the fixed infrastructure on the full-rate traffic outbound link, for communicating at least one of forward power control information, soft hand-off information, and reverse power information to the fixed infrastructure.
Claim 18
Dependent Claim
161 words
A subscriber unit for use with a CDMA dispatch communication system having a fixed infrastructure providing dispatch service among a plurality of subscribers units engaged in a group call wherein at least a plurality of group members, including a second group member, are listening to the group call on the same outbound link from the fixed infrastructure when a first group member is transmitting a signal on an inbound link to the fixed infrastructure, the subscriber unit comprising: means for receiving notification from the fixed infrastructure that a group call is being setup; means for establishing a full-rate traffic outbound link for monitoring signals transmitted from the fixed infrastructure; and means for establishing a low-rate inbound link, different from said full-rate traffic inbound link, and prior to receiving the signal from the fixed infrastructure on the full-rate traffic outbound link, for communicating at least one of forward power control information, soft hand-off information, and reverse power information to the fixed infrastructure.
Claim 19
Dependent Claim
38 words
The subscriber unit of claim 14, wherein the means for establishing inbound links includes means for sending a unique code associated with the subscriber unit and used for encoding the information sent over the associated low-rate inbound link.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-09-05 | 2004-03-06 | 2004-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-09-05 | 2008-03-06 | 2008-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-09-05 | 2012-03-06 | 2012-09-05 | $7700.00 | Window Closed / Lapsed |